阅读说明：本技术 一种液力传动装置 (Hydraulic transmission device ) 是由 王庆男 庞洁 孙志新 王宁 那志鹏 金鑫 于 2021-09-17 设计创作，主要内容包括：本发明公开了一种液力传动装置,包括液力箱、机械箱、供油润滑系统及电控系统,液力箱包括液力箱壳体、输入轴法兰和设置在所述液力箱壳体内的输入轴、输入轴泵齿轮、输入轴增速齿轮、液力偶合器泵轮、液力偶合器涡轮、液力变矩器泵轮、液力变矩器涡轮、液力变矩器轴齿轮、液力变矩器中间轴、转子及定子。本发明所述液力传动装置需要一根变矩器轴,其结构简单,制动效率高,体积小且重量小,同时可根据车辆行驶工况的变化,将柴油机的输出特性变成接近于机车的理想牵引特性,由液力传动装置电控系统自动控制相应的执行元件工作,实现低速起动、高速运行、液力制动的无极调速及方向自动切换。(The invention discloses a hydraulic transmission device which comprises a hydraulic box, a mechanical box, an oil supply and lubrication system and an electric control system, wherein the hydraulic box comprises a hydraulic box shell, an input shaft flange, an input shaft pump gear, an input shaft speed-increasing gear, a hydraulic coupler pump impeller, a hydraulic coupler turbine, a hydraulic torque converter pump impeller, a hydraulic torque converter turbine, a hydraulic torque converter shaft gear, a hydraulic torque converter intermediate shaft, a rotor and a stator, wherein the input shaft, the input shaft pump gear, the input shaft speed-increasing gear, the hydraulic coupler pump impeller, the hydraulic coupler turbine, the hydraulic torque converter intermediate shaft, the rotor and the stator are arranged in the hydraulic box shell. The hydraulic transmission device needs a torque converter shaft, has simple structure, high braking efficiency, small volume and light weight, can change the output characteristic of a diesel engine into the ideal traction characteristic close to a locomotive according to the change of the running working condition of the vehicle, automatically controls corresponding executing elements to work by an electric control system of the hydraulic transmission device, and realizes the stepless speed regulation and the automatic direction switching of low-speed starting, high-speed running and hydraulic braking.)

1. A fluid power transmission device, comprising:

the hydraulic box (1) comprises a hydraulic box shell, an input shaft flange (3), an input shaft (4), an input shaft pump gear (5), an input shaft speed increasing gear (6), a hydraulic coupler pump impeller (7), a hydraulic coupler turbine (8), a hydraulic torque converter pump impeller (9), a hydraulic torque converter turbine (10), a hydraulic torque converter shaft gear (11), a hydraulic torque converter intermediate shaft (12), a rotor (21) and a stator (22), wherein the input shaft pump gear (5) is meshed with the hydraulic torque converter shaft gear (11);

the hydraulic coupling pump impeller (7) and the hydraulic torque converter pump impeller (9) are respectively fixed with the hydraulic torque converter shaft gear (11) by bolts and are sleeved on the hydraulic torque converter intermediate shaft (12) in a hollow manner;

the hydraulic coupling turbine (8) and the intermediate shaft (12) of the hydraulic torque converter are fixed in an interference fit mode, and the turbine (10) of the hydraulic torque converter and the intermediate shaft (12) of the hydraulic torque converter are fixed through bolts;

the rotor (21) is connected with the left end of the intermediate shaft (12) of the hydraulic torque converter through a first spline and rotates together with the intermediate shaft (12) of the hydraulic torque converter;

the mechanical box (2) comprises a mechanical box shell, and a first turbine output shaft gear (13), a second turbine output shaft gear (14), a first reversing shaft gear (15), a second reversing shaft gear (16), an output shaft gear (17), an output shaft (18), a hydraulic servo oil cylinder (19) and a sliding shaft (20) which are arranged in the mechanical box shell, wherein the first turbine output shaft gear (13) and the second turbine output shaft gear (14) are sequentially arranged on the sliding shaft (20), and the first turbine output shaft gear (13) is meshed with the first reversing shaft gear (15);

the second reversing shaft gear (16) and the output shaft gear (17) are both meshed with the second turbine output shaft gear (14);

the oil supply lubricating system comprises an oil supply pump gear (23), a coasting pump (24), an oil supply pump (25), a proportional valve (26), a radiator (27), a filter (28), a main control valve (29) and a brake oil filling valve (30);

the electric control system comprises a controller (31), a main control valve electromagnetic valve (32), a reversing electromagnetic valve (33), a brake electromagnetic valve (34), an A-direction displacement sensor (35), a B-direction displacement sensor (36), an input rotating speed sensor (37), an output rotating speed sensor (38), a transmission outlet temperature sensor (39), a brake pressure sensor (40) and a brake temperature sensor (41), wherein the controller (31) controls the connection and disconnection of the main control valve electromagnetic valve (32), the reversing electromagnetic valve (33) and the brake electromagnetic valve (34), and adjusts the opening degree of a proportional valve (26).

2. A hydraulic transmission according to claim 1, characterized in that the sliding shaft (20) is coupled with the intermediate torque converter shaft (12) by a second spline and rotates with the intermediate torque converter shaft (12);

the left end of the sliding shaft (20) is provided with an external spline, a first spline groove is formed in the first turbine output shaft gear (13), and a second spline groove is formed in the second turbine output shaft gear (14);

when the sliding shaft (20) moves to the right position, the B-direction displacement sensor (36) starts to work after the external spline of the sliding shaft (20) is meshed with the second spline groove of the second turbine output shaft gear (14) to drive the second turbine output shaft gear (14) to be meshed with the output shaft gear (17) to realize power transmission in one direction;

when the sliding shaft (20) moves to the left side position, the external spline of the sliding shaft (20) is meshed with the first spline groove of the first turbine output shaft gear (13) to drive the first turbine output shaft gear (13) to be meshed with the first reversing shaft gear (15) and drive the second reversing shaft gear (16) to be meshed with the output shaft gear (17) to achieve power transmission in the other direction, and then the A-direction displacement sensor (35) starts to work.

3. A fluid transmission unit as claimed in claim 1, characterised in that the main control valve solenoid valves (32) are double solenoid valves and control the filling of fluid between the fluid coupling impeller (7) and the fluid coupling turbine (8) and between the torque converter impeller (9) and the torque converter turbine (10), respectively.

4. A hydraulic transmission as claimed in claim 1, characterised in that the reversing solenoid valve (33) is a dual solenoid valve and adjusts the position of the hydraulic servo cylinder (19).

5. A hydraulic transmission as claimed in claim 1, characterized in that said brake solenoid valve (34) is adapted to control the connection and disconnection of the brake oil charge valve (30).

6. The hydraulic transmission device as claimed in claim 1, wherein the input shaft pump gear (5) is engaged with the oil supply pump gear (23) to drive the oil supply pump (25) to operate, so that the main control valve (29) and the brake oil filling valve (30) are in a standby state.

7. The hydraulic transmission device as claimed in claim 1, wherein the hydraulic transmission device is operated in three operating states including a low-speed start operating condition, a high-speed operation operating condition and a braking operating condition;

when the hydraulic coupler is in a low-speed starting working condition, the hydraulic coupler pump wheel (7) is filled with oil to drive the hydraulic coupler turbine wheel (8) to rotate;

when the hydraulic torque converter is in a high-speed operation working condition, the pump impeller (9) of the hydraulic torque converter is filled with oil to drive the turbine (10) of the hydraulic torque converter to rotate;

when the brake is in a braking working condition, the rotor (21) and the stator (22) are in an oil-filled state.

Technical Field

The invention relates to the technical field of machine manufacturing, in particular to a hydraulic transmission device.

Background

A hydraulic power transmission device is a device for connecting a power source such as an engine or a motor to a working machine to transmit rotational power, and is a device for transmitting energy by using fluid as a working medium and using the kinetic energy of the fluid. The output torque of the hydraulic torque converter can be automatically increased or decreased along with the increase or decrease of the external load, the rotating speed can be automatically and correspondingly reduced or increased, and stepless speed regulation can be realized in a larger range. The vehicle transmission can reduce the gear number, simplify the operation, prevent the internal combustion engine from flameout and improve the general performance of the vehicle. The hydraulic coupler has the characteristic of automatic speed change. The traditional hydraulic transmission device needs two torque converter shafts to work, and the brake gate valve is easy to wear, complex in structure, large in size and weight and low in efficiency.

Disclosure of Invention

The invention provides a hydraulic transmission device, which aims to solve the problems that the existing hydraulic transmission device is complex in structure, easy to wear a brake gate valve and large in size and weight.

In order to achieve the purpose, the technical scheme of the invention is as follows:

a fluid power transmission device comprising:

the hydraulic box comprises a hydraulic box shell, an input shaft flange, and an input shaft, an input shaft pump gear, an input shaft accelerating gear, a hydraulic coupler pump impeller, a hydraulic coupler turbine, a hydraulic torque converter pump impeller, a hydraulic torque converter turbine, a hydraulic torque converter shaft gear, a hydraulic torque converter intermediate shaft, a rotor and a stator which are arranged in the hydraulic box shell, wherein the input shaft pump gear is meshed with the hydraulic torque converter shaft gear;

the hydraulic coupler pump impeller and the hydraulic torque converter pump impeller are respectively fixed with the hydraulic torque converter shaft gear by bolts and are sleeved on the hydraulic torque converter intermediate shaft in a hollow manner;

the hydraulic coupler turbine is fixed with the hydraulic torque converter intermediate shaft in an interference fit mode, and the hydraulic torque converter turbine is fixed with the hydraulic torque converter intermediate shaft through bolts;

the rotor is connected with the left end of the intermediate shaft of the hydraulic torque converter through a first spline and rotates along with the intermediate shaft of the hydraulic torque converter;

the mechanical box comprises a mechanical box shell, and a first turbine output shaft gear, a second turbine output shaft gear, a first reversing shaft gear, a second reversing shaft gear, an output shaft, a hydraulic servo oil cylinder and a sliding shaft which are arranged in the mechanical box shell, wherein the sliding shaft is sequentially provided with the first turbine output shaft gear and the second turbine output shaft gear, and the first turbine output shaft gear is meshed with the first reversing shaft gear;

the second reversing shaft gear and the output shaft gear are meshed with the second turbine output shaft gear;

the oil supply lubricating system comprises an oil supply pump gear, an idle pump, an oil supply pump, a proportional valve, a radiator, a filter, a main control valve and a brake oil filling valve;

the electronic control system comprises a controller, a main control valve electromagnetic valve, a reversing electromagnetic valve, a brake electromagnetic valve, an A-direction displacement sensor, a B-direction displacement sensor, an input rotating speed sensor, an output rotating speed sensor, a transmission device outlet temperature sensor, a brake pressure sensor and a brake temperature sensor, wherein the controller controls the connection and disconnection of the main control valve electromagnetic valve, the reversing electromagnetic valve and the brake electromagnetic valve, and adjusts the opening degree of a proportional valve.

Further, the sliding shaft is connected with the intermediate shaft of the hydraulic torque converter through a second spline and rotates together with the intermediate shaft of the hydraulic torque converter;

the left end of the sliding shaft is provided with an external spline, a first spline groove is formed in the first turbine output shaft gear, and a second spline groove is formed in the second turbine output shaft gear;

when the sliding shaft moves to the right position, the external spline of the sliding shaft is meshed with the second spline groove of the second turbine output shaft gear to drive the second turbine output shaft gear to be meshed with the output shaft gear to realize power transmission in one direction, and then the B-direction displacement sensor starts to work;

when the sliding shaft moves to the left side position, the external spline of the sliding shaft is meshed with the first spline groove of the first turbine output shaft gear to drive the first turbine output shaft gear to be meshed with the first reversing shaft gear and drive the second reversing shaft gear to be meshed with the output shaft gear to realize power transmission in the other direction, and then the A-direction displacement sensor starts to work.

Furthermore, the electromagnetic valve of the main control valve is a duplex electromagnetic valve and respectively controls oil filling between the pump impeller of the hydraulic coupler and the turbine of the hydraulic coupler and oil filling between the pump impeller of the hydraulic torque converter and the turbine of the hydraulic torque converter.

Furthermore, the reversing electromagnetic valve is a duplex electromagnetic valve, and the position of the hydraulic servo oil cylinder is adjusted.

Furthermore, the brake electromagnetic valve is used for controlling connection and disconnection of the brake oil filling valve.

Furthermore, the input shaft pump gear is meshed with the oil supply pump gear to drive the oil supply pump to work, so that the main control valve and the brake oil filling valve are in a state of waiting to work.

Furthermore, the hydraulic transmission device comprises three working states of a low-speed starting working condition, a high-speed running working condition and a braking working condition when working;

when the hydraulic coupler is in a low-speed starting working condition, the pump impeller of the hydraulic coupler is filled with oil to drive the turbine of the hydraulic coupler to rotate;

when the hydraulic torque converter is in a high-speed operation working condition, the pump impeller of the hydraulic torque converter is filled with oil to drive the turbine of the hydraulic torque converter to rotate;

when the brake is in a braking working condition, the rotor and the stator are in an oil-filled state.

The invention discloses a hydraulic transmission device, which changes the output characteristic of a diesel engine into an ideal traction characteristic close to that of a locomotive, and an electric control system of the hydraulic transmission device automatically controls corresponding execution elements to work, thereby realizing stepless speed regulation and direction automatic switching of low-speed starting, high-speed running and hydraulic braking. In addition, the structure of the hydraulic transmission device is simplified by reducing one torque converter shaft, the hydraulic transmission device is small in size and light in weight, and still has all the characteristics of hydraulic transmission; and the hydraulic braking function is added, and the hydraulic braking system is used as an auxiliary braking system of the vehicle, so that the adaptability of the vehicle is greatly improved, the problem of brake shoe abrasion of the long and large ramp vehicle is solved, and the safety of the vehicle is improved.

Drawings

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

FIG. 1 is a schematic view of a hydraulic transmission according to the present invention in an original state;

FIG. 2 is a schematic view of a torque converter operating condition of the hydrostatic transmission;

FIG. 3 is a schematic view of a hydraulic transmission coupling operating condition;

FIG. 4 is a schematic view of the hydraulic transmission brake operating condition;

fig. 5 is a schematic view of a reversing operation of the hydraulic transmission.

In the figure, 1, a hydraulic tank, 2, a mechanical tank, 3, an input shaft flange, 4, an input shaft, 5, an input shaft pump gear, 6, an input shaft step-up gear, 7, a hydraulic coupling pump impeller, 8, a hydraulic coupling turbine, 9, a hydraulic torque converter pump impeller, 10, a hydraulic torque converter turbine, 11, a hydraulic torque converter shaft gear, 12, a hydraulic torque converter intermediate shaft, 13, a first turbine output shaft gear, 14, a second turbine output shaft gear, 15, a first reversing shaft gear, 16, a second reversing shaft gear, 17, an output shaft gear, 18, an output shaft, 19, a hydraulic servo cylinder, 20, a sliding shaft, 21, a rotor, 22, a stator, 23, a fuel feed pump gear, 24, an idle pump, 25, a fuel feed pump, 26, a proportional valve, 27, a radiator, 28, a filter, 29, a main control valve, 30, a brake fuel feed valve, 31, a controller, 32, a main control valve, 33. a reversing electromagnetic valve 34, a brake electromagnetic valve 35, an A-direction displacement sensor, a 36-B-direction displacement sensor, 37, an input rotating speed sensor 38, an output rotating speed sensor 39, a transmission outlet temperature sensor 40, a brake pressure sensor 41 and a brake temperature sensor.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. 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.

As shown in fig. 1-5, a fluid power transmission device includes: the hydraulic box 1 comprises a hydraulic box shell, an input shaft flange 3, an input shaft 4, an input shaft pump gear 5, an input shaft speed increasing gear 6, a hydraulic coupler pump impeller 7, a hydraulic coupler turbine 8, a hydraulic torque converter pump impeller 9, a hydraulic torque converter turbine 10, a hydraulic torque converter shaft gear 11, a hydraulic torque converter intermediate shaft 12, a rotor 21 and a stator 22, wherein the input shaft pump gear 5 is arranged in the hydraulic box shell and meshed with the hydraulic torque converter shaft gear 11;

the hydraulic coupler pump impeller 7 and the hydraulic torque converter pump impeller 9 are respectively fixed with the hydraulic torque converter shaft gear 11 by bolts and are sleeved on the hydraulic torque converter intermediate shaft 12 in a hollow manner; in the embodiment, the hydraulic coupling pump impeller 7 and the torque converter shaft gear 11 are fixedly connected through bolts, the torque converter pump impeller 9 and the torque converter shaft gear 11 are fixedly connected through bolts, and are sleeved on the torque converter intermediate shaft 12 in an empty mode;

the hydraulic coupling turbine 8 and the hydraulic torque converter intermediate shaft 12 are fixed in an interference fit mode, and the hydraulic torque converter turbine 10 and the hydraulic torque converter intermediate shaft 12 are fixed through bolts; in the embodiment, the hydraulic coupling turbine 8 is fixed with the intermediate torque converter shaft 12 in an interference fit manner, and the hydraulic torque converter turbine 10 is fixed with the intermediate torque converter shaft 12 in a bolted connection manner;

the rotor 21 is connected with the left end of the intermediate hydraulic torque converter shaft 12 through a first spline and rotates together with the intermediate hydraulic torque converter shaft 12; in the present embodiment, the internal spline of the rotor 21 is connected to the external spline at the left end of the intermediate torque converter shaft 12, and rotates together with the intermediate torque converter shaft 12;

the mechanical box 2 comprises a mechanical box shell, and a first turbine output shaft gear 13, a second turbine output shaft gear 14, a first reversing shaft gear 15, a second reversing shaft gear 16, an output shaft gear 17, an output shaft 18, a hydraulic servo oil cylinder 19 and a sliding shaft 20 which are arranged in the mechanical box shell, wherein the sliding shaft 20 is sequentially provided with the first turbine output shaft gear 13 and the second turbine output shaft gear 14, and the first turbine output shaft gear 13 is meshed with the first reversing shaft gear 15; in the present embodiment, the hydraulic tank 1 and the machine tank 2 serve as the load-bearing members of the entire transmission, and function as oil tanks, and have sufficient strength and sealing performance.

The second reversing shaft gear 16 and the output shaft gear 17 are both meshed with the second turbine output shaft gear 14;

the oil supply lubricating system comprises an oil supply pump gear 23, an idle pump 24, an oil supply pump 25, a proportional valve 26, a radiator 27, a filter 28, a main control valve 29 and a brake oil filling valve 30; in this embodiment, the output shaft 18 drives the idle pump 24 to operate when rotating, and lubrication of each gear and bearing is ensured, at this time, the input shaft 3 may not rotate, that is, the oil supply pump gear 23 may not operate; the transmission oil of the hydraulic transmission device is used for lubricating, cooling and controlling the electromagnetic valve and the proportional valve of the hydraulic transmission device and is required to meet the requirement of the cleanliness of the transmission oil of the hydraulic transmission device.

The electronic control system comprises a controller 31, a main control valve electromagnetic valve 32, a reversing electromagnetic valve 33, a brake electromagnetic valve 34, an A-direction displacement sensor 35, a B-direction displacement sensor 36, an input rotating speed sensor 37, an output rotating speed sensor 38, a transmission outlet temperature sensor 39, a brake pressure sensor 40 and a brake temperature sensor 41, wherein the controller 31 controls the connection and disconnection of the main control valve electromagnetic valve 32, the reversing electromagnetic valve 33 and the brake electromagnetic valve 34 and adjusts the opening degree of a proportional valve 26. In the embodiment, the proportional valve 26 has the functions of a safety valve, ensuring that the pressure of the oil supply control system of the hydraulic transmission device is in a positive range, and adjusting and controlling the flow and the pressure of the transmission oil circuit; the controller 31 is used for processing commands sent by a vehicle control system and signals sent by various sensors and controlling an actuating element on the hydraulic transmission device according to the running state; the controller 31 has a persistent data store in which diagnostic and operational data may be stored.

Further, the sliding shaft 20 is coupled with the intermediate torque converter shaft 12 through a second spline, and rotates together with the intermediate torque converter shaft 12;

the left end of the sliding shaft 20 is provided with an external spline, a first spline groove is formed in the first turbine output shaft gear 13, and a second spline groove is formed in the second turbine output shaft gear 14;

when the sliding shaft 20 moves to the right position, the B-direction displacement sensor 36 starts to work after the external spline of the sliding shaft 20 is meshed with the second spline groove of the second turbine output shaft gear 14 to drive the second turbine output shaft gear 14 to be meshed with the output shaft gear 17 to realize power transmission in one direction; in this embodiment, when the sliding shaft 20 is at the right limit position, the external spline of the sliding shaft 20 is engaged with the second spline groove of the second turbine output shaft gear 14 to drive the second turbine output shaft gear 14 to be engaged with the output shaft gear 17 to realize power transmission in one direction, and at this time, the B-direction displacement sensor 36 acts;

when the sliding shaft 20 moves to the left position, the external spline of the sliding shaft 20 is meshed with the first spline groove of the first turbine output shaft gear 13 to drive the first turbine output shaft gear 13 to be meshed with the first reversing shaft gear 15 and drive the second reversing shaft gear 16 to be meshed with the output shaft gear 17 to realize power transmission in the other direction, and then the a-direction displacement sensor 35 starts to work. In this embodiment, when the sliding shaft 20 is at the left limit position, the external spline of the sliding shaft 20 engages with the first spline groove of the first turbine output shaft gear 13 to drive the first turbine output shaft gear 13 to engage with the first reversing shaft gear 15, and the second reversing shaft gear 16 engages with the output shaft gear 17 to realize power transmission in the other direction, and at this time, the a-direction displacement sensor 35 acts.

Further, the main control valve electromagnetic valve 32 is a duplex electromagnetic valve, and controls oil filling between the hydraulic coupling pump impeller 7 and the hydraulic coupling turbine 8 and oil filling between the hydraulic torque converter pump impeller 9 and the hydraulic torque converter turbine 10 respectively. In this embodiment, the main control valve electromagnetic valve 32 is a duplex electromagnetic valve for respectively controlling oil filling between the pump impeller 7 of the hydraulic coupler and the turbine 8 of the hydraulic coupler and oil filling between the pump impeller 9 of the hydraulic torque converter and the turbine 10 of the hydraulic torque converter, and is used for different working conditions.

Further, the reversing solenoid valve 33 is a duplex solenoid valve, and adjusts the position of the hydraulic servo cylinder 19.

Further, the brake solenoid valve 34 is used to control the connection and disconnection of the brake oil charge valve 30.

Further, the input shaft pump gear 5 is engaged with the oil supply pump gear 23 to drive the oil supply pump 25 to work, so that the main control valve 29 and the brake oil filling valve 30 are in a standby state. In this embodiment, the input shaft pump gear 5 is meshed with the oil supply pump gear 23 to drive the oil supply pump 25 to operate, so as to ensure that the main control valve 29 and the brake oil filling valve 30 are in a standby state, and to ensure the lubrication of each gear and bearing.

Furthermore, the hydraulic transmission device comprises three working states of a low-speed starting working condition, a high-speed running working condition and a braking working condition when working;

when the hydraulic coupler is in a low-speed starting working condition, the pump impeller 7 of the hydraulic coupler is filled with oil to drive the turbine 8 of the hydraulic coupler to rotate;

when the hydraulic torque converter is in a high-speed operation working condition, the pump impeller 9 of the hydraulic torque converter is filled with oil to drive the turbine 10 of the hydraulic torque converter to rotate;

when the brake is in the braking condition, the rotor 21 and the stator 22 are in an oil-filled state. In the embodiment, the hydraulic coupler pump impeller 7 drives the hydraulic coupler turbine 8 to rotate in an oil-filled state for a low-speed starting working condition; the hydraulic torque converter pump impeller 9 drives the hydraulic torque converter turbine 10 to rotate in an oil charging state for a high-speed operation working condition; and oil is filled between the rotor 21 and the stator 22, heat is consumed, and the brake working condition is realized.

In this embodiment, the hydraulic transmission device of the present invention has five operating states, which are an initial operating state, a torque converter operating state, a coupler operating state, a brake operating state, and a reversing operating state, and correspond to the initial operating state, the low-speed operating state, the high-speed operating state, the braking state, the reversing operating state, and the like of the hydraulic transmission device, respectively.

As shown in fig. 1, in the original state of the hydraulic transmission device, the diesel engine transmits power to an input shaft flange 3 of the hydraulic transmission device through an elastic coupling, an oil supply pump 25 is driven to operate by meshing an input shaft pump gear 5 and an oil supply pump gear 23, the oil supply pump 25 supplies hydraulic transmission oil to each control valve, the hydraulic transmission oil waits for the further action of the control valve at the inlet of the control valve and transmits the hydraulic transmission oil to each bearing and gear of the hydraulic transmission device for lubrication; the input shaft 4 is meshed with a shaft gear 11 of the hydraulic torque converter through an input shaft speed increasing gear 6 to drive a shaft of the hydraulic torque converter to rotate, the shaft of the hydraulic torque converter respectively drives the hydraulic torque converter, the hydraulic coupler and a turbine output shaft to rotate simultaneously, and the torque converter, the coupler and the brake are not filled with oil at the moment.

As shown in fig. 2, when the torque converter of the hydraulic transmission device is in a working state, i.e., in a low-speed traction state, the controller 31 controls the valve on the main control valve solenoid valve 32 to be switched on, so that the control transmission oil enters the upper portion of the main control valve 29 through the torque converter solenoid valve 32, and the control transmission oil pushes the valve core on the main control valve 29 to move downward, so that the hydraulic transmission oil at the inlet of the main control valve 29 can enter the pump impeller 9 and the turbine runner 10 of the hydraulic torque converter through the main control valve 29, and the torque converter is filled with oil. After the torque converter is filled with oil, the pump impeller 9 of the hydraulic torque converter rotates to drive transmission oil to flow, the transmission oil drives the turbine 10 of the hydraulic torque converter to rotate, the turbine 10 of the torque converter drives the turbine output shaft to rotate, the turbine output shaft is meshed with the output shaft gear 17 through the second turbine output shaft gear 14 to drive the output shaft 18 to rotate, and the output shaft 18 transmits power to the axle gear box through the universal shaft.

As shown in fig. 3, when the hydraulic transmission coupling is in a working state, i.e., in a high-speed operation state, the controller 31 controls the lower valve of the main control valve electromagnetic valve 32 to be switched on, so that the control transmission oil enters the position below the main control valve electromagnetic valve 32, and the control transmission oil pushes the lower valve core of the main control valve 29 to move upwards, so that the hydraulic transmission oil at the inlet of the main control valve 29 can enter the pump impeller 7 and the turbine runner 8 of the hydraulic coupling through the main control valve 29, so that the coupling is filled with oil. After the coupler is filled with oil, the pump wheel 7 of the hydraulic coupler drives the turbine 8 of the hydraulic coupler to rotate through transmission oil, the turbine 8 of the hydraulic coupler drives the output shaft of the turbine to rotate, the output shaft of the turbine is meshed with the output shaft gear 17 through the second turbine output shaft gear 14 to drive the output shaft 18 to rotate, and the output shaft 18 transmits power to the axle gear box through the universal shaft.

As shown in fig. 4, the hydraulic transmission brake is in an operating state, the controller 31 controls the brake solenoid valve 34 to be switched on, so that the control transmission oil enters above the brake oil charging valve 30, the control transmission oil pushes the valve core of the brake oil charging valve 30 to move downwards, the hydraulic transmission oil at the inlet of the brake oil charging valve 30 can enter the rotor 21 and the stator 22 of the hydraulic brake through the brake oil charging valve 30, the rotor 21 drives the hydraulic transmission oil to act on the stator 22 fixed in the brake, so that the stator 22 forms a reverse torque on the rotor 21, the turbine output shaft is decelerated, the output shaft 18 is decelerated to run, the hydraulic braking effect is achieved, the friction of the hydraulic transmission oil and the impact on the fixed stator 22 are converted into heat energy, the operating temperature of the hydraulic transmission oil is increased, the hydraulic transmission oil is led into the radiator 27 to circulate and flow to consume the heat, the proportional valve 26 serves as a safety valve to ensure that the pressure of the oil supply control system of the hydraulic transmission device is in a positive range, and also serves to regulate and control the flow and pressure of the transmission oil path.

As shown in fig. 5, when the hydraulic transmission device is in a reversing working state, the controller 31 controls the reversing solenoid valve 33 to be switched on, so that control transmission oil enters the right side of the hydraulic servo cylinder 19, the control transmission oil pushes the valve core of the hydraulic servo cylinder 19 to drive the sliding shaft 20 to move leftward, when the sliding shaft 20 is in a left limit position, the external spline of the sliding shaft 20 is meshed with the internal spline of the first turbine output shaft gear 13 to drive the first turbine output shaft gear 13 to be meshed with the first reversing shaft gear 15, the second reversing shaft gear 16 is meshed with the output shaft gear 17 to realize power transmission in another direction, and since power passes through a pair of meshed gears in the transmission process, the transmission direction of the output shaft 18 is opposite. The reversing operation can only be performed when the locomotive is stationary, i.e., when the output shaft of the hydraulic transmission is not rotating.

The transmission device of the invention automatically switches from filling the hydraulic coupler to filling the hydraulic torque converter or from filling the hydraulic torque converter to filling the hydraulic coupler according to the speed of a vehicle and the load condition of a diesel engine. The torque converter is charged with oil in the low speed range, and the fluid coupling is charged with oil in the high speed range. During the switching process, the oil filling time of the hydraulic torque converter and the oil filling time of the hydraulic coupler are overlapped, so that the traction force can be ensured not to be interrupted.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.