阅读说明：本技术 一种可以能量回收的双浮钳盘式制动器及其控制方法 (Double-floating caliper disc brake capable of recovering energy and control method thereof ) 是由 何仁 恽航 于 2021-08-13 设计创作，主要内容包括：本发明公开了一种可以能量回收的双浮钳盘式制动器及其控制方法,包括主制动钳总成、副制动钳总成、滑槽板、配油盘和制动盘；主制动钳总成和副制动钳总成通过滑槽板连接,滑槽板固定安装在车辆的制动钳支架上,配油盘位于滑槽板内连通主制动钳总成和副制动钳总成的制动油路；主制动钳总成与制动盘之间分别设有第一制动块和第二制动块；副制动钳总成与制动盘之间分别设有第一摩擦纳米发电机和第二摩擦纳米发电机；主制动钳总成和副制动钳总成分别夹持制动盘的两侧面进行制动。本发明通过同时设置主制动钳总成和副制动钳总成在完成制动的同时进行制动能量的回收,结构集成度高,适用于大部分车辆,能够在保证车辆制动性能的前提下充分地回收制动能量。(The invention discloses a double-floating caliper disc brake capable of recovering energy and a control method thereof, wherein the double-floating caliper disc brake comprises a main brake caliper assembly, an auxiliary brake caliper assembly, a chute plate, an oil distribution disc and a brake disc; the main brake caliper assembly and the auxiliary brake caliper assembly are connected through a chute plate, the chute plate is fixedly installed on a brake caliper support of a vehicle, and an oil distribution disc is positioned in the chute plate and is communicated with a brake oil path of the main brake caliper assembly and the auxiliary brake caliper assembly; a first brake block and a second brake block are respectively arranged between the main brake caliper assembly and the brake disc; a first friction nano generator and a second friction nano generator are respectively arranged between the auxiliary brake caliper assembly and the brake disc; the main brake caliper assembly and the auxiliary brake caliper assembly clamp two side faces of the brake disc respectively to brake. The main brake caliper assembly and the auxiliary brake caliper assembly are arranged at the same time, so that the braking energy is recovered while the braking is finished, the structural integration level is high, the brake caliper is suitable for most vehicles, and the braking energy can be fully recovered on the premise of ensuring the braking performance of the vehicles.)

1. The utility model provides a can two floating caliper disc brake of energy recuperation which characterized in that: the brake caliper comprises a main brake caliper assembly (1), an auxiliary brake caliper assembly (2), a chute plate (3), an oil distribution disc (4) and a brake disc (5); the main brake caliper assembly (1) and the auxiliary brake caliper assembly (2) are connected through a sliding groove plate (3), the sliding groove plate (3) is fixedly installed on a brake caliper support of a vehicle, and the oil distribution disc (4) is positioned in the sliding groove plate (3) and is communicated with a brake oil way of the main brake caliper assembly (1) and the auxiliary brake caliper assembly (2); a first brake block (6) and a second brake block (7) are respectively arranged between the main brake caliper assembly (1) and the brake disc (5); a first friction nano generator (8) and a second friction nano generator (9) are respectively arranged between the auxiliary brake caliper assembly (2) and the brake disc (5); the main brake caliper assembly (1) and the auxiliary brake caliper assembly (2) clamp two side faces of a brake disc (5) respectively to brake.

2. The energy recovery capable double-floating caliper disc brake of claim 1, wherein: the main brake caliper assembly (1) comprises a main brake caliper body (11), a main caliper body sliding pin (12), a main caliper body return spring (13), a main caliper body piston assembly (14), a main control valve (15), an auxiliary valve (16) and a main control electromagnetic valve (17), wherein the main brake caliper body (11) is slidably mounted on a brake caliper bracket of a vehicle through the main caliper body sliding pin (12), and the main caliper body return spring (13) is positioned between the main brake caliper body (11) and the main caliper body sliding pin (12); the brake caliper comprises a main caliper body piston assembly (14), a main control valve (15), an auxiliary valve (16) and a main control electromagnetic valve (17), wherein the main caliper body piston assembly (14), the main control electromagnetic valve (17) is located in an oil path between the main control valve (15) and the main caliper body piston assembly (14), the main control valve (15) is connected with the auxiliary valve (16) in series, the auxiliary valve (16) is communicated with a brake oil path of an auxiliary brake caliper assembly (2) through an oil distribution disc (4), a first brake block (6) is fixedly installed at the end of the main caliper body piston assembly (14), a second brake block (7) is installed on the main brake caliper body (11), and the first brake block (6) and the second brake block (7) are located at opposite positions on two sides of a brake disc (5) respectively.

3. The energy recovery capable double-floating caliper disc brake of claim 2, wherein: the main caliper body piston assembly (14) comprises a main caliper body piston body (141), a main caliper body piston return spring (142) and a main caliper body piston cylinder (143), the main caliper body piston body (141) is fixedly connected with the first brake block (6), and the main caliper body piston body (141) moves in the main caliper body piston cylinder (143) along the axial direction of the brake disc (5); the main caliper body piston return spring (142) is positioned between the main caliper body piston body (141) and the main brake caliper body (11), and the main caliper body piston return spring (142) pulls the main caliper body piston body (141) to move along one side far away from the brake disc (5);

the main control valve (15) comprises a main control valve spool (151), a main control valve pressure adjusting bolt (152) and a main control valve pre-tightening spring (153), the main control valve pre-tightening spring (153) is located between the main control valve spool (151) and the main control valve pressure adjusting bolt (152), and the main control valve spool (151) can move left and right along the axis direction of the main control valve pressure adjusting bolt (152);

a main oil inlet (111), a main oil return port (112), a main control valve oil inlet (154) and a main control valve oil outlet (155) are formed in the main brake caliper body (11), and a main control valve left cavity (156) and a main control valve right cavity (157) are formed between the main brake caliper body (11) and the main control valve spool (151); the main oil inlet (111) is respectively communicated with a main caliper body piston cylinder (143) and a main control valve oil inlet (154), the movement of a main control valve spool (151) can communicate or cut off an oil path between the main control valve oil inlet (154) and a main control valve oil outlet (155), the main control valve oil inlet (154) is communicated with a main control valve right cavity (157), and the main control valve left cavity (156) is communicated with a main oil return port (112);

the main control electromagnetic valve (17) comprises a main control electromagnetic valve spool (171), a main control electromagnetic valve permanent magnet (172), a main control electromagnetic valve electromagnetic coil (173) and a main control electromagnetic valve return spring (174), wherein the end part of the main control electromagnetic valve spool (171) is a cone, and when the main control electromagnetic valve electromagnetic coil (173) is not electrified, the main control electromagnetic valve spool (171) blocks the main control valve oil inlet (154) under the action of the main control electromagnetic valve return spring (174);

the auxiliary valve (16) comprises an auxiliary valve spool (161), an auxiliary valve pressure adjusting bolt (162) and an auxiliary valve pre-tightening spring (163), the auxiliary valve pre-tightening spring (163) is located between the auxiliary valve spool (161) and the auxiliary valve pressure adjusting bolt (162), and the auxiliary valve spool (161) can move left and right along the axial direction of the auxiliary valve pressure adjusting bolt (162);

an auxiliary valve oil inlet (164) and an auxiliary valve oil outlet (165) are formed in the main brake caliper body (11), and an auxiliary valve left cavity (166) and an auxiliary valve right cavity (167) are formed between the main brake caliper body (11) and the auxiliary valve spool (161); the main control valve oil outlet (155) is communicated with an auxiliary valve oil inlet (164), the movement of an auxiliary valve spool (161) can be communicated with or cut off an oil path between the auxiliary valve oil inlet (164) and an auxiliary valve oil outlet (165), an auxiliary valve left cavity (166) is communicated with a main oil return port (112), and the auxiliary valve oil outlet (165) is respectively communicated with an auxiliary valve right cavity (167) and an oil distribution disc (4).

4. The energy recovery capable double-floating caliper disc brake of claim 3, wherein: the auxiliary brake caliper assembly (2) comprises an auxiliary brake caliper body (21), an auxiliary caliper body sliding pin (22), an auxiliary caliper body return spring (23), an auxiliary caliper body piston assembly (24) and an auxiliary caliper body operating valve (25), the auxiliary brake caliper body (21) is slidably mounted on a brake caliper bracket of a vehicle through the auxiliary caliper body sliding pin (22), and the auxiliary caliper body return spring (23) is located between the auxiliary brake caliper body (21) and the auxiliary caliper body sliding pin (22);

the auxiliary caliper body piston assembly (24) and the auxiliary caliper body operating valve (25) are positioned in the auxiliary brake caliper body (21), the oil way of the oil distribution disc (4) is respectively communicated with the auxiliary caliper body operating valve (25) and the auxiliary caliper body piston assembly (24) at the same time, the auxiliary caliper body operating valve (25) is connected with the oil way between the oil distribution disc (4) and an oil tank for storing brake fluid,

the first friction nanometer generator (8) is fixedly installed at the end of the auxiliary caliper body piston assembly (24), the second friction nanometer generator (9) is installed on the auxiliary caliper body (21), and the first friction nanometer generator (8) and the second friction nanometer generator (9) are respectively located at opposite positions on two sides of the brake disc (5).

5. The energy recovery enabled double-floating caliper disc brake of claim 4, wherein: the vice caliper body piston assembly (24) comprises a vice caliper body piston body (241), a vice caliper body piston return spring (242) and a vice caliper body piston cylinder (243), the vice caliper body piston body (241) is fixedly connected with the first friction nano generator (8), and the vice caliper body piston body (241) moves in the vice caliper body piston cylinder (243) along the axial direction of the brake disc (5); the auxiliary caliper body piston return spring (242) is positioned between the auxiliary caliper body piston body (241) and the auxiliary brake caliper body (21), and the auxiliary caliper body piston return spring (242) pulls the auxiliary caliper body piston body (241) to move along one side far away from the brake disc (5);

the auxiliary caliper body control valve (25) comprises a control valve spool (251), a permanent magnet (252), an electromagnetic coil (253) and a control valve return spring (254), the permanent magnet (252) is fixedly connected with the control valve spool (251), the electromagnetic coil (253) is fixedly connected with the auxiliary caliper body (21), the electromagnetic coil (253) attracts the permanent magnet (252) when being electrified, and the control valve return spring (254) is located between the permanent magnet (252) and the electromagnetic coil (253);

an operating valve oil inlet (211) and an operating valve oil drain port (212) are formed in the auxiliary brake caliper body (21), an oil path between the operating valve oil inlet (211) and the operating valve oil drain port (212) can be communicated or cut off through movement of a valve core (251) of the operating valve, and the operating valve oil inlet (211) is communicated with a piston cylinder (243) of the auxiliary caliper body.

6. The energy recovery enabled double-floating caliper disc brake of claim 5, wherein: the auxiliary clamp body control valve (25) comprises a temperature relay (255), the temperature relay (255) measures the temperature of the first friction nanometer generator (8), and the on-off of the electromagnetic coil (253) and the electromagnetic coil (173) of the main control electromagnetic valve are controlled according to the temperature.

7. The energy recovery capable double-floating caliper disc brake of claim 1, wherein: the oil distribution plate is characterized in that the chute plate (3) comprises a plate body (31), a main guide rail (32), an auxiliary guide rail (33) and an oil distribution plate mounting hole (34), the main guide rail (32) and the auxiliary guide rail (33) are respectively located on two sides of the plate body (31), the extending direction of the main guide rail (32) and the extending direction of the auxiliary guide rail (33) are parallel to the axis direction of the brake disc (5), the oil distribution plate mounting hole (34) penetrates through the plate body (31), and the oil distribution plate (4) is embedded in the oil distribution plate mounting hole (34).

8. The energy recovery capable double-floating caliper disc brake of claim 1, wherein: the oil distribution disc (4) comprises an oil distribution disc body (41), a main oil channel (42), an auxiliary oil channel (43) and a connecting hole (44), wherein the main oil channel (42) and the auxiliary oil channel (43) are long counter bores on two sides of the oil distribution disc body (41), the length directions of the long counter bores are distributed along the axial direction of the brake disc (5), and the connecting hole (44) is located in the center of the long counter bore and is communicated with the main oil channel (42) and the auxiliary oil channel (43).

9. The method of controlling an energy recovery capable double-floating caliper disc brake of claim 6, comprising the steps of:

step one, starting a brake: brake fluid enters a main caliper body piston cylinder (143) from a main oil inlet (111), and a main brake caliper assembly (1) starts to brake to establish brake fluid pressure;

step two, measuring the temperature of the first friction nano-generator (8): the temperature relay (255) measures the temperature of the first friction nanogenerator (8);

when the measured temperature of the first friction nano generator (8) is lower than a set temperature value, a main control electromagnetic valve electromagnetic coil (173) is electrified, meanwhile, an electromagnetic coil (253) is not electrified, the main control valve oil inlet (154) is communicated with a main oil inlet (111), meanwhile, an oil drain port (212) of a control valve is closed, and the step three is carried out;

when the measured temperature of the first friction nano generator (8) is larger than or equal to a set temperature value, a main control electromagnetic valve electromagnetic coil (173) is not electrified, meanwhile, an electromagnetic coil (253) is electrified, a main control electromagnetic valve spool (171) cuts off an oil way between a main control valve oil inlet (154) and a main oil inlet (111), brake fluid enters a main caliper body piston cylinder (143) from the main oil inlet (111), and the main brake caliper assembly (1) completes braking; meanwhile, an oil path between an oil inlet (211) of the control valve and an oil drain port (212) of the control valve is communicated;

step three, selecting an energy recovery time:

when the thrust of the right cavity (157) of the main control valve is smaller than the pretightening force of the pretightening spring (153) of the main control valve, the valve core (151) of the main control valve is kept still, the valve core (151) of the main control valve cuts off an oil path between an oil inlet (154) of the main control valve and an oil outlet (155) of the main control valve, brake fluid enters a piston cylinder (143) of a main caliper body from a main oil inlet (111), the main brake caliper assembly (1) completes braking, and meanwhile, the main brake caliper assembly completes braking

The first friction nano generator (8) and the second friction nano generator (9) are kept in an initial state;

when the thrust of a right cavity (157) of the main control valve is larger than the pretightening force of a pretightening spring (153) of the main control valve, and the thrust of a right cavity (167) of the auxiliary valve is smaller than the pretightening force of a pretightening spring (163) of the auxiliary valve, a valve core (151) of the main control valve slides leftwards, an oil inlet (154) of the main control valve is communicated with an oil outlet (155) of the main control valve, a valve core (161) of the auxiliary valve is kept still, brake fluid sequentially passes through the oil outlet (155) of the main control valve, an oil inlet (164) of the auxiliary valve, an oil outlet (165) of the auxiliary valve and an oil distribution disc (4) from the oil inlet (154) of the main control valve and enters an auxiliary clamp piston cylinder (243), a first friction nano generator (8) and a second friction nano generator (9) are respectively contacted with a brake disc (5), and the brake fluid in the left cavity (156) of the main control valve returns to an oil tank for storing the brake fluid from a main oil return port (112);

when the thrust of a right cavity (157) of the main control valve is larger than the pretightening force of a pretightening spring (153) of the main control valve, and the thrust of a right cavity (167) of the auxiliary valve is larger than the pretightening force of a pretightening spring (163) of the auxiliary valve, a valve core (151) of the main control valve and a valve core (161) of the auxiliary valve slide leftwards simultaneously, an oil inlet (154) of the main control valve is communicated with an oil outlet (155) of the main control valve, the valve core (161) of the auxiliary valve cuts off an oil path between an oil inlet (164) of the auxiliary valve and an oil outlet (165) of the auxiliary valve, and a first friction nano generator (8) and a second friction nano generator (9) are respectively kept in contact with a brake disc (5); and entering a second step when the temperature of the first friction nanometer generator (8) is greater than or equal to a set temperature value.

10. The control method of the energy-recovery-possible double-floating-caliper disc brake according to claim 9, characterized in that: the first friction nanometer generator (8) and the second friction nanometer generator (9) are identical in structure and comprise insulating pressing plates (81), electrodes (82) and polytetrafluoroethylene membranes (83), the first friction nanometer generator (8) is connected with an auxiliary caliper body piston body (241) through the insulating pressing plates (81), the second friction nanometer generator (9) is connected with an auxiliary caliper body (21) through the insulating pressing plates (81), the electrodes (82) are located between the insulating pressing plates (81) and the polytetrafluoroethylene membranes (83), and the polytetrafluoroethylene membranes (83) are in contact with a brake disc (5) during power generation;

the power generated by the contact friction between the polytetrafluoroethylene film (83) and the brake disc (5)WAnd pressure intensityPThe functional relationship is calibrated and fitted through experiments:f(W, P) =0, according to real-time powerWEstimating contact pressureP(ii) a There exists an optimum pressure valueP _optCorresponding to maximum powerW _max；

The preload of the auxiliary valve preload spring (163) is equal to F₁₆₃=P _optA₅A₁₆₁/A₂₄₁，

In the formula, F₁₆₃Is the pre-tension of an auxiliary valve pre-tension spring (163), A₅Is the contact friction area of the first friction nano generator (8) or the second friction nano generator (9) and the brake disc (5), A₁₆₁Is the area of the right end face of the valve core (161) of the auxiliary valve, A₂₄₁The contact area between the auxiliary caliper body piston body (241) and brake fluid;

the pretightening force of the main control valve pretightening spring (153) is smaller than the pretightening force of the auxiliary valve pretightening spring (163) and is set to beF ₁₅₃=(0.1~0.2)T _max A ₁₄₁/μRA ₆Wherein, T_maxIs the maximum braking that can be generated by the first brake block (6) and the second brake block (7)Sum of moments, A₁₄₁Is the area of the left end surface of the piston body (141) of the main caliper body, mu is the average friction coefficient between the first brake block (6), the second brake block (7) and the brake disc (5), R is the average distance from the equivalent action point of the contact friction of the first brake block (6), the second brake block (7) and the brake disc (5) to the center of the circle of revolution, A is the average distance between the equivalent action point of the contact friction of the first brake block (6), the second brake block (7) and the brake disc (5)₆Is the average area of the first brake block (6) and the second brake block (7) for contact friction.

Technical Field

The invention relates to an automobile brake and a control method thereof, in particular to a double-floating caliper disc brake capable of recovering energy and a control method thereof, belonging to the technical field of automobile braking energy recovery.

Background

In 2012, a friction nano generator (TENG) based on organic materials was invented for the first time by a Wangzhong forest project group, and the working principle of the TENG is based on the coupling of a triboelectrification effect and an electrostatic induction effect. In recent years, friction nano-generators have been used to collect energy in the form of human body motion, vibration, mechanical triggering, tire rotation, wind energy, water energy, and the like. The existing friction nanometer generator mainly has four working modes: a vertical contact separation mode, a horizontal sliding mode, a single electrode mode, and an independent layer mode.

Chinese patent CN106849496B discloses a braking friction force power generation system for an electric vehicle, which proposes to generate power by using braking friction force, transmit braking force to a generator rotor through a tooth cone, and control the torque of the generator by adjusting the exciting current of the generator, so as to control the magnitude of the braking friction force. However, the generator of the invention of this patent is bulky and not easily mounted on the vehicle brake.

Chinese patent CN103391020B discloses a multi-degree-of-freedom energy collecting device based on a friction nano-generator, and proposes a friction nano-generator capable of collecting multi-dimensional vibration energy, and this type of generator is based on mode switching of a vertical contact separation mode and a horizontal sliding mode. However, considering the characteristics of the disc brake of the automobile disc brake, such as detachability, high rotation speed, etc., the disc brake of the disc brake is not convenient as an electrode for rubbing the nanogenerator in a vertical contact separation mode and a horizontal sliding mode.

Disclosure of Invention

The purpose of the invention is as follows: the invention aims to provide a double-floating caliper disc brake capable of realizing energy recovery and a control method thereof, aiming at the problems in the prior art.

The technical scheme is as follows: a double-floating caliper disc brake capable of recovering energy comprises a main caliper assembly, an auxiliary caliper assembly, a chute plate, an oil distribution disc and a brake disc; the main brake caliper assembly and the auxiliary brake caliper assembly are connected through a sliding groove plate, the sliding groove plate is fixedly mounted on a brake caliper support of a vehicle, and the oil distribution disc is positioned in the sliding groove plate and communicated with a brake oil path of the main brake caliper assembly and the auxiliary brake caliper assembly; a first brake block and a second brake block are respectively arranged between the main brake caliper assembly and the brake disc; a first friction nano generator and a second friction nano generator are respectively arranged between the auxiliary brake caliper assembly and the brake disc; and the main brake caliper assembly and the auxiliary brake caliper assembly clamp two side surfaces of a brake disc respectively to brake.

The main brake caliper assembly and the auxiliary brake caliper assembly are arranged at the same time, so that the braking energy is recovered while the braking is finished, the structural integration level is high, the brake caliper is suitable for most vehicles, and the braking energy can be fully recovered on the premise of ensuring the braking performance of the vehicles.

Preferably, in order to sufficiently recover braking energy on the premise of ensuring the braking performance of the vehicle, the main brake caliper assembly comprises a main brake caliper body, a main caliper body sliding pin, a main caliper body return spring, a main caliper body piston assembly, a main control valve, an auxiliary valve and a main control electromagnetic valve, wherein the main brake caliper body is slidably mounted on a brake caliper bracket of the vehicle through the main caliper body sliding pin, and the main caliper body return spring is positioned between the main brake caliper body and the main caliper body sliding pin; the brake system comprises a main caliper body piston assembly, a main control valve, an auxiliary valve and a main control electromagnetic valve, wherein the main caliper body piston assembly, the main control valve, the auxiliary valve and the main control electromagnetic valve are located in a main brake caliper body, the main control electromagnetic valve is located on an oil path between the main control valve and the main caliper body piston assembly, the main control valve is connected with the auxiliary valve in series, the auxiliary valve is communicated with a brake oil path of an auxiliary brake caliper assembly through an oil distribution disc, a first brake block is fixedly installed at the end portion of the main caliper body piston assembly, a second brake block is installed on the main brake caliper body, and the first brake block and the second brake block are located at opposite positions of two sides of a brake disc respectively.

Preferably, in order to further improve the structural integration degree, the main caliper body piston assembly comprises a main caliper body piston body, a main caliper body piston return spring and a main caliper body piston cylinder, the main caliper body piston body is fixedly connected with the first brake block, and the main caliper body piston body moves in the main caliper body piston cylinder along the axial direction of the brake disc; the main caliper body piston return spring is positioned between the main caliper body piston body and the main brake caliper body, and pulls the main caliper body piston body to move along one side far away from the brake disc;

the main control valve comprises a main control valve spool, a main control valve pressure adjusting bolt and a main control valve pre-tightening spring, the main control valve pre-tightening spring is positioned between the main control valve spool and the main control valve pressure adjusting bolt, and the main control valve spool can move left and right along the axis direction of the main control valve pressure adjusting bolt;

a main oil inlet, a main oil return port, a main control valve oil inlet and a main control valve oil outlet are formed in the main brake caliper body, and a main control valve left cavity and a main control valve right cavity are formed between the main brake caliper body and a main control valve core; the main oil inlet is respectively communicated with the main caliper body piston cylinder and the main control valve oil inlet, the movement of the main control valve spool can communicate or cut off an oil path between the main control valve oil inlet and the main control valve oil outlet, the main control valve oil inlet is communicated with the main control valve right cavity, and the main control valve left cavity is communicated with the main oil return port;

the main control electromagnetic valve comprises a main control electromagnetic valve core, a main control electromagnetic valve permanent magnet, a main control electromagnetic valve electromagnetic coil and a main control electromagnetic valve return spring, wherein the end part of the main control electromagnetic valve core is a cone, and when the main control electromagnetic valve electromagnetic coil is not electrified, the main control electromagnetic valve core blocks an oil inlet of the main control valve under the action of the main control electromagnetic valve return spring;

the auxiliary valve comprises an auxiliary valve core, an auxiliary valve pressure adjusting bolt and an auxiliary valve pre-tightening spring, the auxiliary valve pre-tightening spring is positioned between the auxiliary valve core and the auxiliary valve pressure adjusting bolt, and the auxiliary valve core can move left and right along the axis direction of the auxiliary valve pressure adjusting bolt;

an auxiliary valve oil inlet and an auxiliary valve oil outlet are formed in the main brake caliper body, and an auxiliary valve left cavity and an auxiliary valve right cavity are formed between the main brake caliper body and an auxiliary valve core; the oil outlet of the main control valve is communicated with the oil inlet of the auxiliary valve, the movement of the valve core of the auxiliary valve can communicate or cut off an oil path between the oil inlet of the auxiliary valve and the oil outlet of the auxiliary valve, the left cavity of the auxiliary valve is communicated with the main oil return port, and the oil outlet of the auxiliary valve is communicated with the right cavity of the auxiliary valve and the oil distribution disc respectively.

Preferably, in order to improve the braking energy recovery efficiency, the auxiliary brake caliper assembly comprises an auxiliary brake caliper body, an auxiliary caliper body sliding pin, an auxiliary caliper body return spring, an auxiliary caliper body piston assembly and an auxiliary caliper body operating valve, wherein the auxiliary brake caliper body is slidably mounted on a brake caliper bracket of a vehicle through the auxiliary caliper body sliding pin, and the auxiliary caliper body return spring is positioned between the auxiliary brake caliper body and the auxiliary caliper body sliding pin;

the auxiliary caliper body piston assembly and the auxiliary caliper body operating valve are positioned in the auxiliary brake caliper body, the oil path of the oil distribution disc is respectively communicated with the auxiliary caliper body operating valve and the auxiliary caliper body piston assembly at the same time, the auxiliary caliper body operating valve is connected with the oil path between the oil distribution disc and an oil tank for storing brake fluid,

the first friction nanometer generator is fixedly arranged at the end part of the piston assembly of the auxiliary brake caliper body, the second friction nanometer generator is arranged on the auxiliary brake caliper body, and the first friction nanometer generator and the second friction nanometer generator are respectively positioned at opposite positions on two sides of the brake disc.

Preferably, in order to further improve the braking energy recovery efficiency, the vice caliper piston assembly comprises a vice caliper piston body, a vice caliper piston return spring and a vice caliper piston cylinder, the vice caliper piston body is fixedly connected with the first friction nano generator, and the vice caliper piston body moves in the vice caliper piston cylinder along the axial direction of the brake disc; the auxiliary caliper body piston return spring is positioned between the auxiliary caliper body piston body and the auxiliary brake caliper body, and pulls the auxiliary caliper body piston body to move along one side far away from the brake disc;

the auxiliary caliper body control valve comprises a control valve spool, a permanent magnet, an electromagnetic coil and a control valve return spring, the permanent magnet is fixedly connected with the control valve spool, the electromagnetic coil is fixedly connected with the auxiliary caliper body, the electromagnetic coil attracts the permanent magnet when being electrified, and the control valve return spring is positioned between the permanent magnet and the electromagnetic coil;

the auxiliary brake caliper is characterized in that a control valve oil inlet and a control valve oil drain port are formed in the auxiliary brake caliper body, an oil path between the control valve oil inlet and the control valve oil drain port can be communicated or cut off through movement of a valve element of the control valve, and the control valve oil inlet is communicated with a piston cylinder of the auxiliary caliper body.

Preferably, in order to ensure that the friction nano generator can work safely and improve the recovery efficiency of braking energy, the auxiliary clamp body control valve comprises a temperature relay, the temperature relay measures the temperature of the first friction nano generator, and the electromagnetic coil and the main control electromagnetic valve are controlled to be switched on and off according to the temperature. The first friction nano generator is firstly contacted with the brake disc, and the first friction nano generator and the second friction nano generator are identical in structure, so that the working temperature of the first friction nano generator is higher than that of the second friction nano generator, and as long as the working temperature of the first friction nano generator does not exceed the highest temperature of the friction nano generator, the second friction nano generator does not exceed the highest temperature, and the normal work of the friction nano generator is ensured; meanwhile, in order to ensure that the auxiliary brake caliper assembly does not work, the main brake caliper assembly can brake normally, and the temperature relay also controls the on-off of the electromagnetic coil of the main control electromagnetic valve.

Preferably, in order to further improve the integration of the structure, the chute plate comprises a plate body, a main guide rail, an auxiliary guide rail and an oil distribution disc mounting hole, wherein the main guide rail and the auxiliary guide rail are respectively positioned on two sides of the plate body, the extending directions of the main guide rail and the auxiliary guide rail are parallel to the axial direction of the brake disc, the oil distribution disc mounting hole penetrates through the plate body, and the oil distribution disc is embedded in the oil distribution disc mounting hole.

Preferably, in order to ensure that the main brake caliper assembly and the auxiliary brake caliper assembly are communicated with each other through oil passages in the moving process, the oil distribution disc comprises an oil distribution disc body, a main oil passage, an auxiliary oil passage and connecting holes, the main oil passage and the auxiliary oil passage are long counter bores on two sides of the oil distribution disc body, the length directions of the long counter bores are distributed along the axial direction of the brake disc, and the connecting holes are located in the centers of the long counter bores and are communicated with the main oil passage and the auxiliary oil passage. The main oil passage and the auxiliary oil passage are arranged to ensure the communication of the oil passages of the main brake caliper assembly and the auxiliary brake caliper assembly in the moving process.

A control method of a double-floating caliper disc brake capable of recovering energy comprises the following steps:

step one, starting a brake: brake fluid enters a main caliper body piston cylinder from a main oil inlet, and a main brake caliper assembly starts braking to establish brake fluid pressure;

step two, measuring the temperature of the first friction nano generator: the temperature relay measures the temperature of the first friction nanogenerator;

when the measured temperature of the first friction nano generator is lower than a set temperature value, electrifying a main control electromagnetic coil, simultaneously not electrifying the electromagnetic coil, communicating an oil inlet of the main control valve with a main oil inlet, simultaneously closing an oil drain port of an operation valve, and entering the third step;

when the measured temperature of the first friction nano generator is larger than or equal to a set temperature value, the electromagnetic coil of the main control electromagnetic valve is not electrified, the electromagnetic coil is electrified at the same time, the valve core of the main control electromagnetic valve cuts off an oil way between the oil inlet of the main control valve and the main oil inlet, brake fluid enters the piston cylinder of the main caliper body from the main oil inlet, and the main brake caliper assembly finishes braking; meanwhile, an oil way between an oil inlet of the control valve and an oil drain port of the control valve is communicated;

step three, selecting an energy recovery time:

when the thrust of the right cavity of the main control valve is smaller than the pre-tightening force of a pre-tightening spring of the main control valve, a valve core of the main control valve is kept still, the valve core of the main control valve cuts off an oil way between an oil inlet of the main control valve and an oil outlet of the main control valve, brake fluid enters a piston cylinder of a main caliper body from a main oil inlet, a main brake caliper assembly finishes braking, and meanwhile, a first friction nano generator and a second friction nano generator are kept in an initial state;

when the thrust of the right cavity of the main control valve is larger than the pretightening force of a pretightening spring of the main control valve and the thrust of the right cavity of the auxiliary valve is smaller than the pretightening force of the pretightening spring of the auxiliary valve, a valve core of the main control valve slides leftwards, an oil inlet of the main control valve is communicated with an oil outlet of the main control valve, the valve core of the auxiliary valve is kept still, brake fluid sequentially passes through the oil outlet of the main control valve, the oil inlet of the auxiliary valve, the oil outlet of the auxiliary valve and an oil distribution disc from the oil inlet of the main control valve and enters a piston cylinder of an auxiliary clamp body, a first friction nano generator and a second friction nano generator are respectively contacted with a brake disk, and the brake fluid in the left cavity of the main control valve returns to an oil tank for storing the brake fluid from a main oil return port;

when the thrust of the right cavity of the main control valve is larger than the pretightening force of the pretightening spring of the main control valve and the thrust of the right cavity of the auxiliary valve is larger than the pretightening force of the pretightening spring of the auxiliary valve, a valve core of the main control valve and a valve core of the auxiliary valve slide leftwards simultaneously, an oil inlet of the main control valve is communicated with an oil outlet of the main control valve, an oil path between the oil inlet of the auxiliary valve and the oil outlet of the auxiliary valve is cut off by the valve core of the auxiliary valve, and the first friction nano-generator and the second friction nano-generator are respectively kept in contact with the brake disc; and entering a second step when the temperature of the first friction nanometer generator is greater than or equal to a set temperature value.

Preferably, in order to accurately control the pretightening force, the first friction nano generator and the second friction nano generator have the same structure and comprise an insulating pressing plate, an electrode and a polytetrafluoroethylene membrane, the first friction nano generator is connected with the piston body of the auxiliary caliper body through the insulating pressing plate, the second friction nano generator is connected with the main body of the auxiliary caliper body through the insulating pressing plate, the electrode is positioned between the insulating pressing plate and the polytetrafluoroethylene membrane, and the polytetrafluoroethylene membrane is contacted with a brake disc during power generation;

power generated by contact friction between teflon film and brake discWAnd pressure intensityPThe functional relationship is calibrated and fitted through experiments:f(W, P) =0, according to real-time powerWEstimating contact pressureP(ii) a There exists an optimum pressure valueP _optCorresponding to maximum powerW _max；

The pre-tightening force of the pre-tightening spring of the auxiliary valve is equal to F₁₆₃=P _optA₅A₁₆₁/A₂₄₁，

In the formula, F₁₆₃Is the pre-tightening force of the pre-tightening spring of the auxiliary valve, A₅Is the contact friction area of the first friction nano generator or the second friction nano generator and the brake disc, A₁₆₁Is the area of the right end face of the valve core of the auxiliary valve, A₂₄₁The contact area of the auxiliary caliper body piston body and the brake fluid is shown;

the pretightening force of the pretightening spring of the main control valve is smaller than that of the pretightening spring of the auxiliary valve, and is set asF ₁₅₃=(0.1~0.2)T _max A ₁₄₁/μRA ₆Wherein, T_maxIs the sum of the maximum braking torques that can be generated by the first brake pad and the second brake pad, A₁₄₁Is the area of the left end surface of the piston body of the main caliper body, mu is the average friction coefficient between the first brake block, the second brake block and the brake disc, R is the average distance from the equivalent action point of the contact friction of the first brake block, the second brake block and the brake disc to the center of the circle of revolution, A₆Is the average area of the first and second brake pads that is to be contacted for friction.

Has the advantages that: the invention has high integration level of the structure for recovering energy while completing braking by simultaneously arranging the main brake caliper assembly and the auxiliary brake caliper assembly, is suitable for most vehicles, and can fully recover braking energy on the premise of ensuring the braking performance of the vehicles.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a front view of the chute plate of the present invention;

FIG. 3 is a left side view of the chute plate of the present invention;

FIG. 4 is a schematic view of the oil distribution pan of the present invention;

FIG. 5 is a right side view of the oil distribution pan of the present invention;

FIG. 6 is a schematic structural view of a first triboelectric nanogenerator according to the invention;

fig. 7 is a right side view of a first friction nanogenerator according to the invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

As shown in fig. 1, a double-floating caliper disc brake capable of recovering energy is characterized in that: the brake caliper comprises a main brake caliper assembly 1, an auxiliary brake caliper assembly 2, a chute plate 3, an oil distribution disc 4 and a brake disc 5; the main brake caliper assembly 1 and the auxiliary brake caliper assembly 2 are connected through a chute plate 3, the chute plate 3 is fixedly installed on a brake caliper support of a vehicle, and the oil distribution disc 4 is positioned in the chute plate 3 and communicated with a brake oil path of the main brake caliper assembly 1 and the auxiliary brake caliper assembly 2; a first brake block 6 and a second brake block 7 are respectively arranged between the main brake caliper assembly 1 and the brake disc 5; a first friction nano generator 8 and a second friction nano generator 9 are respectively arranged between the auxiliary brake caliper assembly 2 and the brake disc 5; the main brake caliper assembly 1 and the auxiliary brake caliper assembly 2 respectively clamp two side surfaces of a brake disc 5 for braking.

The main brake caliper assembly 1 comprises a main brake caliper body 11, a main caliper body sliding pin 12, a main caliper body return spring 13, a main caliper body piston assembly 14, a main control valve 15, an auxiliary valve 16 and a main control electromagnetic valve 17, wherein the main brake caliper body 11 is slidably mounted on a brake caliper bracket of a vehicle through the main caliper body sliding pin 12, and the main caliper body return spring 13 is positioned between the main brake caliper body 11 and the main caliper body sliding pin 12; the main caliper body piston assembly 14, the main control valve 15, the auxiliary valve 16 and the main control electromagnetic valve 17 are located in the main brake caliper body 11, the main control electromagnetic valve 17 is located on an oil path between the main control valve 15 and the main caliper body piston assembly 14, the main control valve 15 is connected with the auxiliary valve 16 in series, the auxiliary valve 16 is communicated with a brake oil path of the auxiliary brake caliper assembly 2 through the oil distribution disc 4, the first brake block 6 is fixedly installed at the end portion of the main caliper body piston assembly 14, the second brake block 7 is installed on the main brake caliper body 11, and the first brake block 6 and the second brake block 7 are located at opposite positions on two sides of the brake disc 5 respectively.

The main caliper body piston assembly 14 comprises a main caliper body piston body 141, a main caliper body piston return spring 142 and a main caliper body piston cylinder 143, wherein the main caliper body piston body 141 is fixedly connected with the first brake pad 6, and the main caliper body piston body 141 moves in the main caliper body piston cylinder 143 along the axial direction of the brake disc 5; the main caliper body piston return spring 142 is located between the main caliper body piston body 141 and the main brake caliper body 11, and the main caliper body piston return spring 142 pulls the main caliper body piston body 141 to move along the side away from the brake disc 5;

the main control valve 15 comprises a main control valve spool 151, a main control valve pressure adjusting bolt 152 and a main control valve pre-tightening spring 153, the main control valve pre-tightening spring 153 is positioned between the main control valve spool 151 and the main control valve pressure adjusting bolt 152, and the main control valve spool 151 can move left and right along the axis direction of the main control valve pressure adjusting bolt 152;

a main oil inlet 111, a main oil return port 112, a main control valve oil inlet 154 and a main control valve oil outlet 155 are arranged in the main brake caliper body 11, and a main control valve left cavity 156 and a main control valve right cavity 157 are formed between the main brake caliper body 11 and the main control valve spool 151; the main oil inlet 111 is respectively communicated with the main caliper body piston cylinder 143 and the main control valve oil inlet 154, the movement of the main control valve spool 151 can communicate or cut off an oil path between the main control valve oil inlet 154 and the main control valve oil outlet 155, the main control valve oil inlet 154 is communicated with the main control valve right cavity 157, and the main control valve left cavity 156 is communicated with the main oil return port 112;

the main control electromagnetic valve 17 comprises a main control electromagnetic valve spool 171, a main control electromagnetic valve permanent magnet 172, a main control electromagnetic valve electromagnetic coil 173 and a main control electromagnetic valve return spring 174, the end part of the main control electromagnetic valve spool 171 is a cone, and when the main control electromagnetic valve electromagnetic coil 173 is not electrified, the main control electromagnetic valve spool 171 blocks the main control valve oil inlet 154 under the action of the main control electromagnetic valve return spring 174;

the auxiliary valve 16 comprises an auxiliary valve spool 161, an auxiliary valve pressure adjusting bolt 162 and an auxiliary valve pre-tightening spring 163, wherein the auxiliary valve pre-tightening spring 163 is located between the auxiliary valve spool 161 and the auxiliary valve pressure adjusting bolt 162, and the auxiliary valve spool 161 can move left and right along the axial direction of the auxiliary valve pressure adjusting bolt 162;

an auxiliary valve oil inlet 164 and an auxiliary valve oil outlet 165 are formed in the main brake caliper body 11, and an auxiliary valve left cavity 166 and an auxiliary valve right cavity 167 are formed between the main brake caliper body 11 and the auxiliary valve spool 161; the main control valve oil outlet 155 is communicated with an auxiliary valve oil inlet 164, the movement of the auxiliary valve spool 161 can communicate or cut off an oil path between the auxiliary valve oil inlet 164 and an auxiliary valve oil outlet 165, the auxiliary valve left cavity 166 is communicated with the main oil return port 112, and the auxiliary valve oil outlet 165 is respectively communicated with an auxiliary valve right cavity 167 and the oil distribution disc 4.

The auxiliary brake caliper assembly 2 comprises an auxiliary brake caliper body 21, an auxiliary caliper body sliding pin 22, an auxiliary caliper body return spring 23, an auxiliary caliper body piston assembly 24 and an auxiliary caliper body control valve 25, wherein the auxiliary brake caliper body 21 is slidably mounted on a brake caliper bracket of a vehicle through the auxiliary caliper body sliding pin 22, and the auxiliary caliper body return spring 23 is positioned between the auxiliary brake caliper body 21 and the auxiliary caliper body sliding pin 22;

the auxiliary caliper body piston assembly 24 and the auxiliary caliper body control valve 25 are positioned in the auxiliary brake caliper body 21, the oil path of the oil distribution disc 4 is respectively communicated with the auxiliary caliper body control valve 25 and the auxiliary caliper body piston assembly 24, the auxiliary caliper body control valve 25 is connected with the oil path between the oil distribution disc 4 and an oil tank for storing brake fluid,

the first friction nanometer generator 8 is fixedly arranged at the end part of the auxiliary caliper body piston assembly 24, the second friction nanometer generator 9 is arranged on the auxiliary caliper body 21, and the first friction nanometer generator 8 and the second friction nanometer generator 9 are respectively arranged at opposite positions on two sides of the brake disc 5.

The vice caliper body piston assembly 24 comprises a vice caliper body piston body 241, a vice caliper body piston return spring 242 and a vice caliper body piston cylinder 243, the vice caliper body piston body 241 is fixedly connected with the first friction nano generator 8, and the vice caliper body piston body 241 moves in the vice caliper body piston cylinder 243 along the axial direction of the brake disc 5; the auxiliary caliper body piston return spring 242 is located between the auxiliary caliper body piston body 241 and the auxiliary brake caliper body 21, and the auxiliary caliper body piston return spring 242 pulls the auxiliary caliper body piston body 241 to move along the side away from the brake disc 5;

the auxiliary caliper body control valve 25 comprises a control valve spool 251, a permanent magnet 252, an electromagnetic coil 253 and a control valve return spring 254, the permanent magnet 252 is fixedly connected with the control valve spool 251, the electromagnetic coil 253 is fixedly connected with the auxiliary brake caliper body 21, the electromagnetic coil 253 attracts the permanent magnet 252 when being electrified, and the control valve return spring 254 is positioned between the permanent magnet 252 and the electromagnetic coil 253;

a control valve oil inlet 211 and a control valve oil drain port 212 are arranged in the auxiliary brake caliper body 21, the movement of the control valve spool 251 can communicate or cut off an oil path between the control valve oil inlet 211 and the control valve oil drain port 212, and the control valve oil inlet 211 is communicated with the auxiliary caliper body piston cylinder 243.

The auxiliary caliper body control valve 25 comprises a temperature relay 255, the temperature relay 255 measures the temperature of the first friction nano generator 8, and the on-off of the electromagnetic coil 253 and the electromagnetic coil 173 of the main control electromagnetic valve are controlled according to the temperature.

The invention has high integration level of the energy recovery structure when completing braking by simultaneously arranging the main brake caliper assembly 1 and the auxiliary brake caliper assembly 2, is suitable for most vehicles, and can fully recover the braking energy on the premise of ensuring the braking performance of the vehicles.

As shown in fig. 2 and 3, in order to further improve the integration of the structure, the chute plate 3 includes a plate body 31, a main guide rail 32, a sub guide rail 33, and an oil distribution pan mounting hole 34, the main guide rail 32 and the sub guide rail 33 are respectively located at both sides of the plate body 31, the extending direction of the main guide rail 32 and the sub guide rail 33 is parallel to the axial direction of the brake disc 5, the oil distribution pan mounting hole 34 penetrates through the plate body 31, and the oil distribution pan 4 is embedded in the oil distribution pan mounting hole 34.

As shown in fig. 4 and 5, in order to ensure the communication of the oil passages during the movement of the main brake caliper assembly 1 and the auxiliary brake caliper assembly 2, the oil distribution disc 4 comprises an oil distribution disc body 41, a main oil passage 42, an auxiliary oil passage 43 and a connecting hole 44, wherein the main oil passage 42 and the auxiliary oil passage 43 are elongated counter bores on two sides of the oil distribution disc body 41, the length direction of the elongated counter bores is distributed along the axial direction of the brake disc 5, and the connecting hole 44 is positioned in the center of the elongated counter bores and is communicated with the main oil passage 42 and the auxiliary oil passage 43. The main oil passage 42 and the auxiliary oil passage 43 are arranged to ensure the communication of oil passages during the movement of the main brake caliper assembly 1 and the auxiliary brake caliper assembly 2.

As shown in fig. 1, a method for controlling a double-floating caliper disc brake capable of recovering energy includes the following steps:

step one, starting a brake: brake fluid enters the main caliper body piston cylinder 143 from the main oil inlet 111, and the main brake caliper assembly 1 starts braking to establish brake fluid pressure;

step two, measuring the temperature of the first friction nanogenerator 8: the temperature relay 255 measures the temperature of the first friction nanogenerator 8;

when the measured temperature of the first friction nano-generator 8 is lower than the set temperature value, the electromagnetic coil 173 of the main control electromagnetic valve is electrified, the electromagnetic coil 253 is not electrified, the oil inlet 154 of the main control valve is communicated with the main oil inlet 111, the oil drain port 212 of the control valve is closed, and the step three is performed;

when the measured temperature of the first friction nano generator 8 is greater than or equal to the set temperature value, the electromagnetic coil 173 of the main control electromagnetic valve is not electrified, the electromagnetic coil 253 is electrified, the valve core 171 of the main control electromagnetic valve cuts off an oil path between the oil inlet 154 of the main control valve and the main oil inlet 111, brake fluid enters the piston cylinder 143 of the main caliper body from the main oil inlet 111, and the main brake caliper assembly 1 finishes braking; meanwhile, an oil path between the control valve oil inlet 211 and the control valve oil drain port 212 is communicated;

step three, selecting an energy recovery time:

when the thrust of the right cavity 157 of the main control valve is smaller than the pretightening force of the pretightening spring 153 of the main control valve, the valve core 151 of the main control valve is kept still, the valve core 151 of the main control valve cuts off an oil path between the oil inlet 154 of the main control valve and the oil outlet 155 of the main control valve, brake fluid enters the piston cylinder 143 of the main caliper body from the main oil inlet 111, the main brake caliper assembly 1 finishes braking, and meanwhile, the brake fluid enters the piston cylinder 143 of the main caliper body from the main oil inlet 111

The first friction nano-generator 8 and the second friction nano-generator 9 are kept in an initial state;

when the thrust of the main control valve right cavity 157 is larger than the pretightening force of the main control valve pretightening spring 153, and the thrust of the auxiliary valve right cavity 167 is smaller than the pretightening force of the auxiliary valve pretightening spring 163, the main control valve core 151 slides leftwards, the main control valve oil inlet 154 is communicated with the main control valve oil outlet 155, the auxiliary valve core 161 is kept still, brake fluid sequentially passes through the main control valve oil inlet 155, the auxiliary valve oil inlet 164, the auxiliary valve oil outlet 165 and the oil distribution disc 4 from the main control valve oil inlet 154 and enters the auxiliary caliper body piston cylinder 243, the first friction nano generator 8 and the second friction nano generator 9 are respectively contacted with the brake disc 5, and the brake fluid in the main control valve left cavity 156 returns to an oil tank for storing the brake fluid from the main oil return port 112;

when the thrust of the main control valve right cavity 157 is larger than the pretightening force of the main control valve pretightening spring 153, and the thrust of the auxiliary valve right cavity 167 is larger than the pretightening force of the auxiliary valve pretightening spring 163, the main control valve spool 151 and the auxiliary valve spool 161 slide leftward at the same time, the main control valve oil inlet 154 is communicated with the main control valve oil outlet 155, the auxiliary valve spool 161 cuts off the oil path between the auxiliary valve oil inlet 164 and the auxiliary valve oil outlet 165, and the first friction nano-generator 8 and the second friction nano-generator 9 are respectively kept in contact with the brake disc 5; and (5) when the temperature of the first friction nanometer generator 8 is greater than or equal to the set temperature value, entering the step two.

As shown in fig. 6 and 7, the first friction nano-generator 8 and the second friction nano-generator 9 have the same structure and comprise an insulating pressing plate 81, an electrode 82 and a teflon film 83, the first friction nano-generator 8 is connected with the auxiliary caliper body piston 241 through the insulating pressing plate 81, the second friction nano-generator 9 is connected with the auxiliary caliper body 21 through the insulating pressing plate 81, the electrode 82 is located between the insulating pressing plate 81 and the teflon film 83, and the teflon film 83 is in contact with the brake disc 5 during power generation;

the electrode 82 is made of metal material; the polytetrafluoroethylene membrane 83 is subjected to surface modification through a micro-nano processing technology, the friction coefficient of the polytetrafluoroethylene membrane is far smaller than that of a friction block, and the generated braking torque can be treated as an interference item of the total braking torque of the brake; the surface structure of the polytetrafluoroethylene film 83 is distributed in meshes, each mesh being insulated from the other.

Power generated by contact friction between the teflon film 83 and the brake disk 5WAnd pressure intensityPThe functional relationship is calibrated and fitted through experiments:f(W, P) =0, according to real-time powerWEstimating contact pressureP(ii) a There exists an optimum pressure valueP _optCorresponding to maximum powerW _max；

The preload of the auxiliary valve preload spring 163 is equal to F₁₆₃=P _optA₅A₁₆₁/A₂₄₁，

In the formula, F₁₆₃Is the pre-load force of the auxiliary valve pre-load spring 163, A₅Is the contact friction area of the first friction nano generator 8 or the second friction nano generator 9 and the brake disc 5, A₁₆₁Is the area of the right end face of the auxiliary valve spool 161, A₂₄₁The area of contact between the auxiliary caliper piston body 241 and the brake fluid;

the pretightening force of the main control valve pretightening spring 153 is smaller than the pretightening force of the auxiliary valve pretightening spring 163, and is set toF ₁₅₃=(0.1~0.2)T _max A ₁₄₁/μRA ₆Wherein, T_maxIs the sum of the maximum braking torques that can be generated by the first brake pad 6 and the second brake pad 7, A₁₄₁Is the left end surface area of the piston body 141 of the caliper body, mu is the average coefficient of friction between the first brake pad 6, the second brake pad 7 and the brake disc 5, and R is the first brake pad6. Average distance A from equivalent action point of contact friction between the second brake block 7 and the brake disc 5 to circle center of revolution₆Is the average area of the first 6 and second 7 brake pads for contact friction.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.