JPS62265034A - Car clutch - Google Patents

Abstract

PURPOSE:To enlarge the clutching speed during high power output by furnishing a bypass valve as contour to a one-way valve interposed between a master cylinder and a release cylinder, and by opening the bypass valve when the engine is in high power operation. CONSTITUTION:A bypass valve 34 in a bypass 32 as contour to a one-way valve 26 and a small hole 30 is opened and closed according to signals given by an engine revolving speed sensor 36. That is, the valve 34 is opened during high output power when the number of engine revolutions becomes over approx. 4,000RPM, and oil return to master cylinder 12 during the clutch in engagement is made via said small hole 30 and bypass 32. Accordingly the effective area of return path to cylinder 12 will become greater than during low output operation to allow the oil to return at a high speed. This provides rapid engagement of the clutch 16 in the event of quick start or abrupt speed change in the state of high power output, which should prevent wear due to excessive slip of the clutch 16.

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a hydraulically operated clutch device for a manual transmission type automobile, and in particular to an improvement in technology for adjusting the clutch engagement speed when the clutch pedal is released. Regarding.

(Prior Art) As is well known, the clutch devices of recent manual transmission vehicles are hydraulically operated, and when the clutch pedal is depressed, the hydraulic pressure generated in the master cylinder is transmitted to the release cylinder to operate the clutch release mechanism. It has become.

Also, as is well known, the operating characteristics of the clutch operation system are that when the clutch pedal is depressed, the clutch is instantly disengaged (released), and when the clutch pedal is released and the clutch is engaged, the clutch is not suddenly engaged. It is desirable to connect gradually at an appropriate speed. The characteristic of the abutment is that it creates a so-called half-clutch condition. This reduces shock when the clutch is engaged, allowing for smoother starting and shifting.

In order to realize this characteristic, in a conventional hydraulically operated clutch device, a one-way valve portion that functions as follows is provided in a hydraulic oil passage connecting a master cylinder and a release cylinder.

When the clutch pedal is depressed to disengage the clutch, hydraulic oil flows from the master cylinder to the release cylinder, but at this time, the one-way valve is activated, increasing the effective cross-sectional area of the oil passage, and reducing the flow of oil. Pipe resistance becomes smaller.

When the clutch pedal is released to connect the clutch, hydraulic oil flows from the release cylinder to the master cylinder, but at this time, the one-way valve is closed and the effective cross-sectional area of the oil passage becomes smaller, and the pipe for oil flow is closed. road resistance increases. As a result, oil gradually returns to the master cylinder, and the return speed of the clutch release mechanism (clutch connection method jσ) slows down to a certain degree.

(Problems to be Solved by the Invention) As is well known, a half-clutch is a state in which the clutch friction plate rotates while rubbing, and is the main cause of premature clutch wear. Therefore, it is harmful to leave the clutch in a half-clutch state for longer than necessary unless necessary.

A half-clutch state is necessary when attempting to perform a smooth start or when attempting to perform a smooth gear change when driving at low speeds. This situation is a region where the engine output is relatively small. The effective cross-sectional area of the oil passage constricted by the one-way valve portion is determined so that a half-clutch state can be appropriately achieved under such circumstances.

However, if you suddenly start or shift gears with very high engine output for some purpose, such as to avoid danger or to perform a driving test, the slippage in the half-clutch state becomes extremely large when the clutch is engaged at the normal speed. This accelerates clutch wear, and clutch slippage can prevent you from starting or shifting as quickly as you want.

This invention was made in view of the above-mentioned conventional problems, and its purpose is to achieve an appropriate half-clutch state during normal driving, and when a sudden start or sudden gear change operation is performed under high output conditions. An object of the present invention is to provide a clutch device for an automobile in which the clutch connection speed is increased.

(Means for Solving the Problems) Therefore, in the present invention, a hydraulic oil bypass passage is provided to bypass the one-way valve portion, and a bypass valve is provided for opening/closing this bypass passage. , an operating state detection means for detecting the operating state of the automobile engine, and a valve control means for opening the bypass valve when the detection means detects a predetermined high output operating state.

(Function) When the sharpener is not in the high output operating state, the bypass valve is closed by the first stage of the valve control means 4, and when the clutch is connected, the hydraulic oil flows through the constricted flow path of the one-way valve section to the master. Gradually return to the cylinder.

When the high output operating state is reached, the bypass valve is opened by the valve control means, and when the clutch is connected, the hydraulic oil passes through the bypass valve in addition to the constricted flow path of the one-way valve section and flows into the master cylinder. return. The oil return speed at this time is higher than when the bypass valve is closed.

(Example) FIG. 2 shows an overview of the hydraulically operated clutch device.

10 is a clutch pedal, 12 is a master cylinder connected to the clutch pedal 10 by a bushing rod 14, 16 is a clutch that is constantly biased by a spring in the connecting direction, 18 is a release fork for operating the clutch 16 in the disengaging direction, 20 2 is a release cylinder that operates the fork 18 with hydraulic pressure to disengage the clutch 16, and 22 is a pipe that is an oil passage connecting the release cylinder 20 and the master cylinder 12.

In this embodiment, the hydraulic circuit shown in FIG. 1 is constructed at the connection portion (port portion) with the pipe 22 in the block of the master cylinder 12.

In FIG. 1, C124 is a piston that is pushed by the bushing rod 24 and slides inside the master cylinder 12, 26 is a one-way valve that opens and closes a part of the main passage 28 in the port portion of the cylinder 12, and 30 is one-way valve 26. 32 is a bypass passage that bypasses the one-way valve 26 and the pore 30 to connect the inside of the cylinder 12 and the main passage 28; 34 is a pore that remains open even when the cylinder is closed; It is a bypass valve for closing.

When the clutch pedal 10 is depressed to disengage the clutch 16, hydraulic oil flows from the master cylinder 12 toward the release cylinder 20. At this point, the one-way valve 26 opens and the effective cross-sectional area of the oil passage increases, causing the oil to flow from the master cylinder 12 to the release cylinder 20. pipe resistance to flow is reduced.

When the clutch pedal 10 is returned to connect the clutch 16, hydraulic oil flows from the release cylinder 20 toward the master cylinder 12, but at this time, the one-way valve 26 closes and the effective cross-sectional area of the oil passage becomes smaller, causing the oil to flow. The pipe resistance to the flow increases. As a result, the master cylinder 12
As a result, the return speed of the clutch 16 (clutch connection speed) slows down to some extent.

In this embodiment, the bypass valve 34 is a solenoid valve, and is driven to open and close by a switch signal from an engine speed sensor 36. The engine speed sensor 36 is an example of the above-mentioned operating state detection means, and is turned on when the engine speed is 400 ORPM or more, and turned off when the engine speed is lower than that. That is, the sensor 36 is turned on at high output when the engine speed is 400 ORPM or more, and at this time the bypass valve 34 is excited and opened. At low power, when the engine speed is less than 400 ORPM, the sensor 36 is off and the bypass valve 3
4 is closed when de-energized.

When the clutch is disengaged, the one-way valve 26 opens and the effective cross-sectional area of the oil passage becomes very large, so whether the bypass valve 34 is open or closed has little bearing on it. This is involved when the clutch is connected, where oil returns to the master cylinder 12.

As described above, since the bypass valve 34 is closed during low output, oil returns to the master cylinder 12 only through the pore 30 when the clutch is engaged. The return rate of this hydraulic fluid is relatively slow (producing a proper half-clutch condition under normal operating conditions).

When the output is high, the bypass valve 34 is open, and oil is returned to the master cylinder 12 through the small hole 30 and the bypass passage 32 when the clutch is engaged. That is, the effective cross-sectional area of the return flow path to the master cylinder 12 becomes larger than when the output is low, and the oil returns to the master cylinder 12 at a high speed. Clutch 16 is thus engaged rapidly and becomes fully engaged after only a few more half-clutch conditions than during normal operation.

As a result, excessive slippage of the clutch 16 is prevented during sudden starts or sudden gear changes.

Note that as the driving state detecting means for detecting the driving state of the automobile engine, various types other than the sensor that discriminates the engine rotation speed can be used.

For example, it may be determined whether the engine is in a predetermined high-output operating state by detecting and discriminating the opening degree of the throttle valve or the amount of air intake into the engine.

(Effects of the Invention) As explained above in detail, in the automobile clutch device according to the present invention, clutch engagement is performed relatively slowly in a low output state intended for smooth starting or gear shifting.
When a sudden start or sudden gear change occurs under high output conditions, the clutch is quickly engaged, so the clutch is not left in a half-clutch state more than necessary in situations other than those required, and this prevents the clutch from slipping too much, accelerating wear, and causing sudden clutch slippage. Problems such as the inability to start or change gears suddenly can be resolved.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a main part of an embodiment of the present invention, and FIG. 2 is a perspective view showing an outline of a hydraulically operated clutch device. 10...Clutch pedal 12...Master cylinder 16...Clutch 18...Release release cylinder 20...Release cylinder 22... ...Pipe 26, old one-way valve 28, main passage 30, thin
Hole 32...Bypass passage 23...Bypass valve 36...Engine speed sensor patent applicant Mazda Co., Ltd. representative
Patent attorney - Kensuke Shiro
Patent Attorney Masatoshi Matsumoto Figure 1

Claims (1)

[Claims] (1) In a hydraulically operated clutch device that operates the clutch release mechanism by transmitting the hydraulic pressure generated in the master cylinder when the clutch pedal is depressed to the release cylinder; a one-way valve portion that is provided and increases the effective cross-sectional area of the flow path when the hydraulic oil flows from the master cylinder to the release cylinder, and decreases the effective cross-sectional area for flow in the opposite direction; a bypass passage provided to bypass the one-way valve section in the main passage; a bypass valve for opening/closing the bypass passage; and an operating state detection means for detecting the operating state of the automobile engine; A clutch device for an automobile, comprising: valve control means that opens the bypass valve when a predetermined high-output operating state is detected in the vehicle.