阅读说明：本技术 离合器的连接断开装置 (Connection and disconnection device of clutch ) 是由 北井慎也 于 2019-07-10 设计创作，主要内容包括：本发明提供一种离合器的连接断开装置,且在具有离合器线控系统的离合器的连接断开装置中,提供一种防止产生了系统的故障时的离合器的紧急卡合并能够进行之后的行驶的结构。通过利用第一电磁切换阀(122)来切换第一油室(108)和第三油室(118)的接合状态,从而能够实现根据离合器踏板(50)的行程量来使作动器(48)进行动作并使离合器(16)接合的线控控制,并且能够在产生了系统的故障的情况下实现使离合器踏板(50)的踏力直接被传递到输出活塞(68)上的直接操作。此外,由于输出活塞(68)的第一油室(108)侧的受压面积(A1)和输出活塞(68)的第三油室(118)侧的受压面积(A3)相等,因此能够使输出活塞(68)移动时的工作油的收支相等。(The invention provides a clutch disconnecting device, and in the clutch disconnecting device with a clutch-by-wire system, a structure for preventing emergency engagement of the clutch when a system failure occurs and enabling subsequent driving is provided. By switching the engagement state of the first oil chamber (108) and the third oil chamber (118) by means of the first electromagnetic switching valve (122), it is possible to realize a line control that actuates the actuator (48) and engages the clutch (16) in accordance with the stroke amount of the clutch pedal (50), and it is possible to realize a direct operation that directly transmits the depression force of the clutch pedal (50) to the output piston (68) when a system failure occurs. Further, since the pressure receiving area (A1) on the first oil chamber (108) side of the output piston (68) and the pressure receiving area (A3) on the third oil chamber (118) side of the output piston (68) are equal, the hydraulic oil balance can be made equal when the output piston (68) moves.)

1. A clutch disconnection device (10) is configured to include:

a clutch pedal (50) operated by a driver;

a clutch cylinder (54) to which the depression force of the clutch pedal is transmitted;

a pedal force transmission mechanism (60) that transmits the pedal force of the clutch pedal to the clutch cylinder;

an actuator (46; 202) which is connected to the pedal force transmission mechanism so as to be able to transmit power and which is able to connect or disconnect the clutch (16) via the pedal force transmission mechanism,

the connection disconnection device of the clutch is characterized in that,

the pedal force transmission mechanism is configured to include a cylinder device (56; 200) to which the pedal force of the clutch pedal is transmitted,

the cylinder device is provided with:

an input piston (66) to which a depression force from the clutch pedal is input;

an output piston (68) for outputting the clutch operating oil pressure to the clutch cylinder;

a first oil chamber (108) formed between the input piston and the output piston;

a second oil chamber (118) to which hydraulic oil is supplied and which presses the output piston in the clutch connection direction by the hydraulic pressure of the hydraulic oil,

a pressure receiving area (A1) of the first oil chamber side of the output piston is equal to a pressure receiving area (A3) of the second oil chamber side of the output piston,

the first oil chamber and the second oil chamber are connected via a solenoid valve (122) that can connect or disconnect the first oil chamber and the second oil chamber,

the actuator is connected to the output piston so as to be able to transmit power.

2. The connection disconnection device of a clutch according to claim 1,

the electromagnetic valve is closed when an abnormality occurs in at least one of an electronic control device that controls the disconnecting device and the disconnecting device.

3. Clutch disconnection device according to claim 1 or 2,

when the output piston is moved to the off position of the clutch by the actuator, the electromagnetic valve is closed.

4. Clutch disconnection device according to any of claims 1 to 3,

a pedal depression force simulator is connected to a connection pipe that connects the second oil chamber and the solenoid valve.

5. Clutch disconnection device according to claim 4,

the connection pipe is connected to the storage tank (106) via a second solenoid valve (126).

6. Clutch disconnection device according to any of claims 1 to 5,

the actuator is configured to include:

an electric motor (119; 206);

a screw drive (117; 204) which converts the rotary motion of the motor into a linear motion;

a hydraulic cylinder (115) driven by the screw transmission;

a control oil chamber (112) that is formed at a position adjacent to the output piston and that is supplied with hydraulic oil to press the output piston in a clutch opening direction,

the control oil chamber is formed to be capable of receiving hydraulic oil output from the hydraulic cylinder.

7. Clutch disconnection device according to any of claims 1 to 5,

the actuator (202) is configured to include:

an electric motor (206);

a screw drive (204) that converts the rotational motion of the motor into linear motion,

the screw drive is connected to the output piston in such a manner that power can be transmitted.

8. The connection disconnection device of a clutch according to claim 1,

the electromagnetic valve uses a normally closed electromagnetic valve.

Technical Field

The present invention relates to a clutch disconnection device having a clutch-by-wire system.

Background

There has been proposed a clutch disconnection device having a clutch-by-wire system that controls an actuator based on an operation amount of a clutch pedal to thereby disconnect a clutch. For example, a control device for a clutch described in patent document 1 is such a device. In the connection/disconnection device for a clutch having such a clutch-by-wire system, for example, there is an advantage that running in which the clutch is disconnected by controlling the actuator during coasting running can be performed.

Prior art documents

Patent document

Patent document 1: japanese laid-open patent publication No. 2012-112499

Patent document 2: japanese Kohyo publication 2017-509848

Disclosure of Invention

Problems to be solved by the invention

However, in the clutch-by-wire system, since the clutch pedal and the clutch are not mechanically connected, there is a possibility that the clutch may be suddenly engaged even when the system fails, for example. As a fail-safe for this, for example, a structure is proposed in which a self-locking mechanism is provided and the self-locking mechanism is operated when a system failure occurs, thereby preventing a sudden engagement of the clutch. However, there is a problem that, when the self-lock mechanism is operated, the following traveling becomes difficult.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a structure for preventing sudden engagement of a clutch when a system failure occurs and enabling subsequent travel in a clutch disconnection device including a clutch-by-wire system.

Means for solving the problems

A first aspect of the present invention is a clutch disconnection device (a) including: a clutch pedal operated by a driver; a clutch cylinder to which a depression force of the clutch pedal is transmitted; a pedaling force transmission mechanism for transmitting the pedaling force of the clutch pedal to the clutch cylinder; an actuator that is connected to the pedaling force transmission mechanism so as to be capable of power transmission and that is capable of connecting or disconnecting the clutch via the pedaling force transmission mechanism, wherein (b) the pedaling force transmission mechanism includes a cylinder device to which the pedaling force of the clutch pedal is transmitted, and (c) the cylinder device includes: (d) an input piston to which a depression force from the clutch pedal is input; (e) an output piston for outputting a clutch operation oil pressure to the clutch cylinder; (f) a first oil chamber formed between the input piston and the output piston; (g) a second oil chamber to which hydraulic oil is supplied to press the output piston in a connection direction of the clutch by an oil pressure of the hydraulic oil, (h) a pressure receiving area of the output piston on the first oil chamber side is equal to a pressure receiving area of the output piston on the second oil chamber side, (i) the first oil chamber and the second oil chamber are connected via a solenoid valve that can connect or disconnect between the first oil chamber and the second oil chamber, and (j) the actuator is connected to the output piston so as to be capable of transmitting power.

A second aspect of the invention provides the clutch disconnecting/connecting device according to the first aspect of the invention, wherein the electromagnetic valve is closed when an abnormality occurs in at least one of an electronic control device that controls the disconnecting/connecting device and the disconnecting/connecting device.

A third aspect of the invention provides the clutch disconnecting/connecting device according to the first or second aspect of the invention, wherein the electromagnetic valve is closed when the output piston is moved to the disconnection position of the clutch by the actuator.

A fourth aspect of the invention provides the clutch disconnecting/connecting device according to any one of the first to third aspects of the invention, wherein a pedal depression force simulator is connected to a connecting pipe that connects the second oil chamber and the solenoid valve.

A fifth aspect of the invention provides the clutch disconnecting apparatus of the fourth aspect of the invention, wherein the connection pipe is connected to a storage tank via a second solenoid valve.

A sixth aspect of the invention provides the clutch disconnecting/connecting device according to any one of the first to fifth aspects of the invention, wherein the actuator (a) is configured to include: an electric motor; a screw drive device for converting the rotational motion of the motor into a linear motion; a hydraulic cylinder driven by the screw transmission device; a control oil chamber formed at a position adjacent to the output piston and configured to press the output piston in a clutch opening direction by being supplied with hydraulic oil; (b) the control oil chamber is formed to be capable of receiving the hydraulic oil output from the hydraulic cylinder.

A seventh aspect of the present invention is summarized as the clutch disconnecting device according to any one of the first to fifth aspects of the present invention, wherein (a) the actuator is configured to include: an electric motor; a screw drive device that converts the rotational motion of the motor into a linear motion, and (b) the screw drive device is connected to the output piston so as to be able to transmit power.

In addition, an eighth aspect of the invention is the clutch disconnecting apparatus according to the first aspect of the invention, wherein the electromagnetic valve is a normally closed electromagnetic valve.

Effects of the invention

According to the clutch disconnection device of the first aspect of the invention, the connection/disconnection state between the first oil chamber and the second oil chamber is switched by the solenoid valve, so that the actuator can be operated in accordance with the operation amount of the clutch pedal, and the by-wire control for disconnecting the clutch connection can be performed, and the direct operation for directly transmitting the depression force of the clutch pedal to the output piston can be performed when the system has a failure. For example, the by-wire control is executed in a state where the solenoid valve is opened. At this time, although the first oil chamber and the second oil chamber are connected, since the pressure receiving area on the first oil chamber side of the output piston and the pressure receiving area on the second oil chamber side of the output piston are equal to each other, the hydraulic oil is equally distributed when the output piston moves, and the pressing force applied from the first oil chamber side to the output piston and the pressing force applied from the second oil chamber side to the output piston are equal to each other. Therefore, the pressing force applied from the first oil chamber side to the output piston and the pressing force applied from the second oil chamber side to the output piston are canceled out each other, and it is not necessary to consider the pressing forces applied from the first oil chamber side and the second oil chamber side to the output piston during the transition period of the movement of the output piston. Further, when a failure of the system occurs, the first oil chamber is sealed by closing the electromagnetic valve, and the output piston is held by the hydraulic oil in the first oil chamber, so that the clutch is prevented from being suddenly engaged. Further, since the input piston and the output piston can transmit power via the hydraulic oil in the first oil chamber by sealing the first oil chamber, the direct operation of the clutch by depression of the clutch pedal can be performed, and the vehicle can be continuously driven.

Further, according to the connection/disconnection device for a clutch of the second aspect of the invention, when an abnormality occurs in at least one of the electronic control unit and the connection/disconnection device, the electromagnetic valve is closed to seal the first oil chamber, so that the output piston is held by the hydraulic oil in the first oil chamber, thereby preventing an emergency engagement of the clutch due to the occurrence of the abnormality. Further, the input piston and the output piston can transmit power via the hydraulic oil in the first oil chamber, and the clutch can be directly operated by depression of the clutch pedal.

Further, according to the connection/disconnection device for a clutch of the third aspect of the invention, since the electromagnetic valve is closed when the output piston is moved to the disconnection position of the clutch by the actuator, the first oil chamber is sealed, and the output piston is held by the hydraulic oil in the first oil chamber. Therefore, the actuator can be stopped because the output piston does not need to be held at the off position of the clutch by the power of the actuator.

Further, according to the connection/disconnection device for a clutch of the fourth aspect of the invention, since the pedal depression force simulator is connected to the connection pipe that connects the second oil chamber and the electromagnetic valve, the pedal depression force simulator is connected to the first oil chamber when the electromagnetic valve is opened. At this time, the hydraulic oil that flows from the first oil chamber into the pedal depression force simulator in accordance with the movement of the input piston generates a hydraulic pressure in the pedal depression force simulator, and the hydraulic pressure is transmitted to the input piston as a pedal reaction force of the clutch pedal. Therefore, the pedal reaction force in the depression transition period of the clutch pedal can be generated simulatively by the pedal depression force simulator.

Further, according to the connection/disconnection device for a clutch of the fifth aspect of the invention, since the connection pipe is connected to the reservoir tank via the second electromagnetic valve, when the second electromagnetic valve is opened in a state in which the electromagnetic valve is closed, the pedal depression force simulator is connected to the reservoir tank via the second electromagnetic valve. Therefore, the hydraulic pressure of the second oil chamber and the pedal depression force simulator is released, and therefore, the output piston is prevented from being pressed in the connection direction of the clutch by the hydraulic pressure of the hydraulic oil of the second oil chamber during the movement transition period of the output piston.

Further, according to the connection/disconnection device for a clutch of the sixth aspect of the invention, the hydraulic oil output from the hydraulic cylinder is supplied to the control oil chamber, so that the output piston can be moved in the clutch disconnection direction in accordance with the operation amount of the clutch pedal or can be automatically moved in the clutch disconnection direction in the depression transition period of the clutch pedal by the hydraulic pressure of the hydraulic oil in the control oil chamber.

According to the connection/disconnection device for a clutch of the seventh aspect of the present invention, the rotational motion of the motor is converted into the linear motion by the screw transmission, so that the output piston can be moved by the motor. Thus, by controlling the electric motor, the output piston can be moved in the clutch off direction in accordance with the operation amount of the clutch pedal or the output piston can be automatically moved in the clutch off direction in the depression transition period of the clutch pedal.

Further, according to the connection/disconnection device for a clutch of the eighth aspect of the invention, since the electromagnetic valve is a normally closed electromagnetic valve, even when an abnormality occurs in which the supply of electric power to the system that controls the connection/disconnection device becomes difficult, the electromagnetic valve is closed to seal the first oil chamber, thereby enabling a direct operation of the clutch by depression of the clutch pedal.

Drawings

Fig. 1 is a diagram showing an overall configuration of a connection/disconnection device to which a clutch according to the present invention is applied.

Fig. 2 is an enlarged view of the cylinder device of fig. 1, and shows a state of the cylinder device at the time of normal running.

Fig. 3 is an enlarged view of the cylinder device of fig. 1, and shows a state in which the output piston is held by the working oil of the first oil chamber.

Fig. 4 is an enlarged view of the cylinder device of fig. 1, and shows a state when energization of the first electromagnetic switching valve and the second electromagnetic switching valve is turned off.

Fig. 5 is a diagram showing a structure of a cylinder device according to another embodiment of the present invention.

Detailed Description

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following embodiments, the drawings are simplified or modified as appropriate, and the dimensional ratios, shapes, and the like of the respective portions are not necessarily drawn accurately.