JP2549449Y2 - Clutch sudden connection prevention device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a clutch operating device for a motor vehicle, and more particularly to a clutch rapid-coupling prevention device that prevents a sudden coupling operation of a clutch to prevent a drive system from being damaged. .

[Conventional technology]

DESCRIPTION OF RELATED ART In a motor vehicle, a clutch device is provided between an engine and a transmission as means for transmitting power of an engine to driving wheels or cutting off the driving wheels as necessary.

Conventionally, an operating mechanism of a clutch device includes a clutch pedal and a portion that transmits the operating force of the pedal to a release fork of the clutch device. Usually, the portion that transmits the operating force is hydraulically operated by depressing the clutch pedal. And a cylinder that presses a release fork in response to the hydraulic pressure, and is connected between them by a pipe that transmits hydraulic pressure.

[Problems to be solved by the invention]

By the way, in the conventional clutch operating mechanism as described above, if the connection operation of the clutch pedal is abrupt, the cylinder for operating the release fork also operates abruptly correspondingly, so that the abrupt clutch engagement operation is performed. The clutch, transmission, differential gear, and axle in the drive line may be damaged by an impact load, particularly when the transmission is in the low speed stage, the differential gear is easily damaged, and in the high speed stage, the clutch or transmission is easily damaged. .

The present invention is intended to solve such a problem, and automatically reduces the operating speed of a clutch pedal during a clutch engagement stroke to an optimal speed, thereby preventing a sudden engagement of the clutch, and It is an object of the present invention to provide a clutch sudden-coupling prevention device that can be easily operated and automated.

[Means for solving the problem]

In order to achieve the above-described object, the clutch rapid-coupling prevention device of the present invention is configured such that a piston that operates in response to operation of a clutch pedal, a hydraulic cylinder that includes the piston, and the inside of the hydraulic cylinder are partitioned by the piston. A first oil chamber whose capacity increases in accordance with a clutch engagement operation of a clutch pedal, and a second oil chamber formed on the piston in the hydraulic cylinder on a side opposite to the first oil chamber. An oil passage interconnecting the first oil chamber and the second oil chamber, and a second oil passage interposed between the first oil chamber and the second oil chamber.
A check valve that allows only the flow of oil to the oil chamber; and a check valve that is provided in parallel with the check valve and allows only the flow of oil from the second oil chamber to the first oil chamber. From the second oil chamber to the first
A one-way throttle valve that throttles and controls the flow of oil to the oil chamber by a control signal, and the movement of the piston in a stroke range of the piston corresponding to a stroke from the time when the clutch starts to be engaged until immediately before the clutch is completely engaged. And a valve control unit that sends the control signal to the one-way throttle valve to perform the throttle operation and performs the throttle operation without sending the control signal to the one-way throttle valve outside the stroke range. It is characterized by that.

[Action]

In the above-described clutch rapid engagement prevention device of the present invention, the movement of the piston is detected by the valve control means only in the stroke range of the piston corresponding to the clutch engagement stroke of the clutch pedal from the start of engagement of the clutch to immediately before the complete engagement. Then, a control signal is sent from the valve control means to a one-way throttle valve interposed in an oil passage that connects the first oil chamber and the second oil chamber of the hydraulic cylinder to each other.
The flow of hydraulic oil from the oil chamber to the first oil chamber is restricted, and the operation of reducing the return stroke of the piston is performed.
As a result, the engagement operation of the clutch in the above-described stroke range of the piston becomes gentle, and the smooth engagement of the clutch occurs.

〔Example〕

Next, an embodiment of the present invention will be described. FIG. 1 is a vertical cross-sectional view showing a part of a device for preventing sudden connection of a clutch as an embodiment of the present invention by a circuit symbol, and FIG. FIG. 3 is a perspective view showing a mode of attachment to the camera.

As shown in FIG. 1, the device for preventing sudden connection of a clutch is constituted by a hydraulic cylinder and a hydraulic circuit associated therewith.

More specifically, in this device, a piston 2 having its rod 3 connected to a clutch pedal 8 and operating in accordance with the operation thereof, a hydraulic cylinder 1 containing the piston 2, and the inside of the hydraulic cylinder 1 are partitioned by the piston 2. The first on the side where the capacity increases in accordance with the clutch engagement operation of the clutch pedal 8
Oil chamber 15 and first piston 2 in hydraulic cylinder 1
A second oil chamber 16 formed on the opposite side of the first oil chamber 15 and a first port 11 opening to the first oil chamber 15 and a second port 13 opening to the second oil chamber 16 are mutually connected. It has an oil passage for communication. This oil passage is also connected to an intermediate port 12 provided between the first port 11 and the second port 13 near the first port 11.

In this oil passage, a check valve 5 that allows only the flow of oil from the first oil chamber 15 to the second oil chamber 16, and a second oil chamber 16 that is provided in parallel with the check valve 5. And a variable throttle valve 4 as a one-way throttle valve that restricts the flow of the oil when a control signal is received, while allowing only the oil flow from the first oil chamber 15 to the first oil chamber 15.

In the return stroke range B of the piston 2 corresponding to the clutch engagement stroke of the clutch pedal 8, valve control means for detecting the movement of the piston 2 and sending a control signal to the variable throttle valve 4 to perform a throttle operation is provided in this embodiment. Is constituted by a pilot oil passage 7.

One end of the pilot oil passage 7 is connected to a pressure guiding port 18 in an oil guiding groove 17 provided on the inner wall of the cylinder 1, and the other end is connected to the first oil chamber 15 at a pressure guiding return port 14 through the throttle 6. And a pressure branching from the back pressure oil passage 7a immediately after exiting the pressure guiding port 18 and having the other end connected to the pilot portion of the variable throttle valve 4 without passing through a throttle. And an application oil passage 7b.

The clutch rapid joining prevention device configured as described above,
As shown in FIG. 2, one end of a piston rod 3 is pivotally connected to a clutch pedal 8 in such a manner as to be juxtaposed with an existing clutch operation mechanism, and a trunnion 10 provided at an appropriate position of the hydraulic cylinder 1 is mounted on a vehicle body. Pivotally attached to the support bracket 9 of the camera. In the clutch engaged state, the end of the piston 2 on the side of the second oil chamber 16 (hereinafter, this end is referred to as a rear end) is at a position indicated by a chain line as shown in FIG.

Hereinafter, the movement of the piston 2 due to the operation of the clutch pedal 8 and the flow of the hydraulic oil in the oil passage will be described in order.

(1) When the clutch is disconnected, the piston 2
Is pushed to the left of the figure, and the oil in the first oil chamber 15
Free second through port 11 and intermediate port 12 through check valve 5
It flows to the port 13 (stroke range of C in the figure). Even if the piston 2 moves forward and closes the intermediate port 12, the oil in the first oil chamber 15 flows from the first port 11 via the check valve 5 to the second oil chamber 15.
It flows to the port 13 (stroke range in B in the figure). When the piston 2 further advances and the intermediate port 12 is opened, the oil in the first oil chamber 15 flows freely from the first port 11 to the second oil chamber 16 through the intermediate port 12 and the second port 13 as shown in FIG. Stroke range).

Therefore, during such an operation, no oil pressure acts on the end of the piston 2 on the first oil chamber 15 side, and no resistance force is generated against the operation of the clutch pedal 8. In this way, when the piston 2 reaches the position shown, the clutch is completely disengaged.

(2) When the operation of engaging the clutch is performed and the pressing force of the piston 2 to the front is lost, the piston rod 3 receives the return force of the clutch operating mechanism and tries to retreat.
At this time, in the stroke A shown in the drawing until the rear end of the piston 2 reaches the position shown by the dotted line in the figure, the oil in the second oil chamber 16 is released from the intermediate port 12, the second port because the intermediate port 12 is open.
The flow freely flows from the port 13 to the first port 11, and no special resistance is generated even in the stroke A.

(3) Next, when the piston 2 enters the stroke range shown in FIG. B in which the intermediate port 12 is closed, the flow from the second oil chamber 16 to the first oil chamber 15 is changed to the second port 13 and the first port. 11
, And the pressure in the second oil chamber 16 increases. This pressure is transmitted to the pilot oil passage 7 through the oil guide groove 17 and the pressure guide port 18, but is easily released to the first oil chamber 15 side through the pressure guide return port 14 by the throttle action of the throttle 6. Therefore, the pressure is applied to the pilot portion of the throttle valve 4 along the pressure applying oil passage 7b. Then, the throttle valve 4 is throttled, and the flow from the second port 13 to the first port 11 is extremely restricted, so that a large resistance force acts on the return stroke of the piston 2, and as a result, the clutch Loose joining is performed.

(4) As described above, when the piston 2 retreats and its rear end reaches the position shown by the two-dot chain line in the figure, the oil guide groove 17 is closed, and the pressure of the second oil chamber 16 is reduced by the pressure guide port 18. And the pressure in the pilot oil passage 7 decreases. Then, in the subsequent stroke range shown in FIG. C, the throttle of the throttle valve 4 is opened, and the hydraulic oil flowing out of the second port 13 flows to the first port 11 without being throttled by the throttle valve 4, and the clutch pedal 8 , The return resistance applied to the clutch pedal 8 is reduced, and the relatively quick return of the clutch pedal 8 is realized.

Since the device for preventing sudden connection of the clutch as one embodiment of the present invention operates in this manner, the movement of the clutch pedal 8 can be automatically delayed only during the stroke B during a short period of clutch engagement (half clutch). As a result, it is possible to obtain an effect that it is possible to prevent a drive line of an automobile from being damaged by an impact load due to a sudden connection of a clutch.

In addition, the present invention is suitable for use in an automatic adjustment type clutch system in which a change in a clutch junction point does not easily occur.

As described above, the present invention has been described in detail based on one embodiment. However, the present invention is not limited to only the above-described embodiment, and may be variously modified within the scope described in the claims of the utility model registration. For example, if the valve control means is electromagnetically controlled to electromagnetically control the throttle, the clutch control of the mechanical automatic transmission can be performed finely, and the present apparatus can be used. It can be installed in series between the clutch cylinder and the pedal in the clutch operation mechanism, or can be installed at an appropriate position in the clutch operation mechanism.

[Effect of the invention]

As described in detail above, the following effects and advantages can be obtained by the clutch sudden connection prevention device of the present invention.

(1) When performing the clutch connection operation, the movement of the clutch pedal can be automatically delayed only in the vicinity of the so-called half-clutch state, so that the shock and the clutch breakage due to the sudden engagement of the clutch can be prevented.

(2) Since the clutch joining operation can be automated, the clutch operation becomes easy.

(3) Similarly, in combination with a mechanical transmission, a mechanical automatic transmission can be realized.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a part of a device for preventing sudden connection of a clutch as an embodiment of the present invention by a circuit symbol, and FIG. 2 is a perspective view showing a manner of attaching the device to a clutch pedal. 1 ... hydraulic cylinder, 2 ... piston, 3 ... piston rod, 4 ... throttle valve, 5 ... check valve, 6 ... throttle, 7
…… Pilot oil passage, 8 …… Clutch pedal, 9 …… Support bracket, 10 …… Trunnion, 11 …… First port,
12 ... intermediate port, 13 ... second port, 14 ... pressure return port, 15 ... first oil chamber, 16 ... second oil chamber, 17 ...
Oil guide groove, 18 ... Pressure guide port.

Claims (1)

(57) [Scope of request for utility model registration] 1. A piston that operates in response to operation of a clutch pedal, a hydraulic cylinder containing the piston, and the inside of the hydraulic cylinder is partitioned by the piston, and the capacity increases in accordance with a clutch engagement operation of the clutch pedal. A first oil chamber, a second oil chamber formed in the hydraulic cylinder on a side opposite to the first oil chamber with respect to the piston, and the first oil chamber and the second oil chamber. And an oil passage interposed between the first oil chamber and the second oil chamber interposed in the oil passage.
A check valve that allows only the flow of oil to the oil chamber; and a check valve that is provided in parallel with the check valve and allows only the flow of oil from the second oil chamber to the first oil chamber. From the second oil chamber to the first
A one-way throttle valve that throttles and controls the flow of oil to the oil chamber by a control signal, and the movement of the piston in a stroke range of the piston corresponding to a stroke from the time when the clutch starts to be engaged until immediately before the clutch is completely engaged. And a valve control unit that sends the control signal to the one-way throttle valve to perform the throttle operation and performs the throttle operation without sending the control signal to the one-way throttle valve outside the stroke range. An apparatus for preventing sudden connection of a clutch, characterized in that: