JPH0131785Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a clutch that transmits and cuts off rotation from an engine to a transmission.
It is particularly suitable for use in a clutch in which the operation of the clutch pedal is transmitted to a control means such as a cutoff lever using a booster such as a booster.

As automobiles become larger and their weight increases, the output of the engine also increases, resulting in the use of larger clutches.
Therefore, in order to control the connection and disconnection of such a clutch, a booster such as a booster is generally used. A booster uses compressed air or negative pressure generated in an engine to control the engagement and disengagement of a clutch. By using such a booster, the force required to press the pedal becomes lighter, making the pedal operation much easier.

However, when using a booster that uses compressed air, for example, the pressure of the compressed air often decreases during cold starting, which makes the clutch heavier and increases the burden on the driver. Also, if the pressure of the compressed air decreases, the clutch will not be completely closed, and the transmission will therefore act as a load on the engine. Therefore, even if an attempt is made to start the engine in such a state, a problem arises in that it becomes difficult to start the engine. Furthermore, when using a vacuum booster, the engine does not generate negative pressure when starting the engine, so the booster does not operate properly and the clutch must be shut off using only the force of pressing the clutch pedal. However, similar inconveniences occur in this case as well.

The present invention was devised in view of these problems, and it is an object of the present invention to provide a device that keeps the clutch in the disconnected state in advance so as not to put a burden on the engine during starting. It is something.

In order to achieve the above object, the present invention provides a piston rod of a booster that moves in and out as the clutch pedal is depressed, and also includes a cutoff lever that swings following the piston rod and operates the clutch intermittently. It is set up. Further, a lock plate supported so as to be retractable within the swing locus of the cutoff lever is provided, and a return spring is provided for biasing the lock plate to move out of the swing locus of the cutoff lever. The present invention is characterized in that it is provided with a manually operated lever that moves the lock plate in a protruding manner within the swinging locus of the cutoff lever and engages and holds the cutoff lever in the cutoff position of the clutch.

In a clutch cutoff device constructed in this manner, the manual operation lever is normally opened and the lock plate is moved and held out of the swinging trajectory of the cutoff lever by the biasing force of the return spring. Therefore, in such a state, the piston rod of the booster moves in and out based on the depression of the clutch pedal, and the cutoff lever swings in response to this movement, causing the clutch to operate intermittently.

On the other hand, after depressing and operating the clutch pedal to move the piston rod of the booster to the cutoff position and cut off the clutch, operate the manual operation lever and push the lock plate into the swinging trajectory of the cutoff lever against the return spring. When moved, the disconnection lever is engaged and held in the disconnected position of the clutch by the lock plate to maintain the clutch in the disconnected condition.

Therefore, if you operate the manual operation lever after disengaging the clutch at the end of the work and moving the lock plate to protrude, the clutch will remain in the disengaged state even if you release the clutch pedal to stop the engine. There is no need to depress the clutch pedal to shut off the clutch when starting the engine, and engine starting operability is improved.

In addition, when the booster is able to operate normally as the engine starts, if the clutch pedal is depressed and the manual operation lever is moved to the release position, the lock plate will return to its original position and shut off. Since the lever is returned outside the swinging trajectory, operability after starting does not deteriorate.

Embodiments of the present invention will be described below based on the drawings. As shown in the drawings, a flywheel 2 is fixed to the end of the crankshaft 1, and a recess is formed on the back side of the flywheel 2.
A clutch plate 3 is disposed within this recess, and ring-shaped facings 4 are fixed to both sides of the clutch plate 3. The hub of the clutch plate 3 has a boss portion 5 formed with a spline groove.
is formed, and this boss portion 5 engages with a spline formed on the outer peripheral side of the main shaft 6, thereby causing the clutch plate 3 to rotate together with the main shaft 6. ,
It is adapted to be slidably movable on the main shaft 6 in the axial direction. A pressure plate 7 is arranged on the back side of the clutch plate 3, and this pressure plate 7 is pressed to the left in the figure by a compression coil spring 8. Also, a release lever 10 is attached to the pressure plate 7 via a pin 9.
is installed. This release lever 10
is the yoke 12 fixed to the clutch cover 11.
The release lever 10 is rotatably supported via a fulcrum pin 13, and the other end of the release lever 10 is in contact with a flange portion of a thrust bearing 14. The thrust bearing 14 is rotatably and slidably fitted to the main shaft 6.

A cutoff lever 15 is disposed on the back side of the flange of the thrust bearing 14 of the clutch so as to be able to come into contact with it. That is, this lever 15 is rotatably supported by a fulcrum pin 16, and the other end of this lever 15 is connected to a piston rod 19 of a hydraulic cylinder 18 of a booster 17.
is connected to. The booster 17 includes the hydraulic cylinder 18 and the power cylinder 20.
and a relay valve 21. A master cylinder 23, whose rod is connected to the end of the clutch pedal 22, is connected to the hydraulic cylinder 18 via an oil pipe 24. Also, relay valve 21
is connected to the air tank 25 via an air pipe 26.

Furthermore, a lock plate 27 is arranged so as to be able to come into contact with the upper end of the cutoff lever 15. This lock plate 27 has a substantially L-shape, and is rotatably supported by a bracket 28 via a fulcrum pin 29. Further, the lock plate 27 is pulled in the direction of releasing the lock by a return spring 30. Furthermore, this lock plate 27 is connected to a manual operation lever 32 via a link lever 31. The manual operation lever 32 is disposed, for example, on the driver's seat, and is rotatably supported by a bracket 33 and a pin 34. By manually operating the manual operation lever 32, the lock is activated via the link lever 31. The plate 27 is moved to a lock position protruding into the swinging locus of the cutoff lever 15.

In the above configuration, when performing a normal clutch operation, the lock plate 27 is moved out of the swinging trajectory of the cutoff lever 15 by the tension (biasing force) of the return spring 30 without pulling the operating lever 32. Move it to the unlocked position and hold it there. By operating the clutch pedal 22 in this state, oil from the master cylinder 23 is supplied to the relay valve 21 through the hydraulic cylinder 18, and in conjunction with the switching operation of this valve 21, the power cylinder 20 is switched to the air tank 25.
The piston rod 19 of the hydraulic cylinder 18 is moved by the compressed air supplied from the piston rod 19.
The rotation operation of the cutoff lever 15 is performed by this. Therefore, the thrust bearing 14 is moved on the main shaft 6 by the cutoff lever 15. And this thrust bearing 1
4, the release lever 10 rotates about the fulcrum pin 13, thereby controlling the pressure of the pressure plate 7 against the clutch plate 3. Therefore, the clutch plate 3 moves between the position shown by the solid line and the position shown by the chain line in the figure, thereby transmitting and interrupting the rotational force between the crankshaft 1 and the main shaft 6.

Next, when the manual operation lever 32 is operated and the lock plate 27 is rotated via the link lever 31 to the position shown by the solid line in the figure, this plate 27 will keep the cut-off lever 15 in the cut-off state in this state. will be retained. That is, by depressing the clutch pedal 22 to switch the clutch to the disconnected state and operating the operating lever 32, the disconnection lever 15 is held in the disconnected state.

Therefore, when the day's work is finished, the user depresses the clutch pedal 22 and operates the manual operation lever 32 with the clutch in the disconnected state to hold the disconnection lever 15 in the disconnected state by the lock plate 27. If this is done, the clutch will remain in the disconnected state and there will be no need to depress the clutch to start the next morning, making the starting operation easier. Furthermore, even if the pressure of the compressed air in the air tank 25 is low at the time of starting, since the clutch is already in the disconnected state, no transmission load is applied to the engine, which eliminates the problem of starting problems. can. Note that the lock device may be released when the engine is started and the pressure of the compressed air in the air tank 25 reaches or exceeds the operating pressure.

Although the present invention has been described above with reference to embodiments, the present invention is not limited to the above-mentioned embodiments, and various modifications can be made based on the technical idea of the present invention.
For example, the above embodiment relates to a clutch operated by a booster using compressed air, but the present invention relates to a clutch operated by a booster consisting of a booster using negative pressure of the engine. It is also applicable to

As described above, according to the present invention, by moving the lock plate to the lock position protruding within the swing locus of the cutoff lever using the manual operation means, the clutch is cut off by the control means such as the cutoff lever. It can be locked in the same position.

Therefore, if the lock plate is moved to the lock position with the clutch disengaged, the engine can be started without applying a transmission load to the engine even if the booster is not operating normally. Therefore, it is possible to prevent engine starting failure.

[Brief explanation of drawings]

The drawing is a sectional view of a main part of a clutch interrupting and holding device according to an embodiment of the present invention. In the symbols used in the drawings, 15... cutoff lever, 22... clutch pedal, 27... lock plate, 32... manual operation lever.

Claims (1)

[Scope of utility model registration request] A piston rod of a booster that moves in and out as the clutch pedal is depressed; a cutoff lever that swings following the piston rod to intermittently operate the clutch; a supported lock plate, a return spring that urges the lock plate to move out of the swing trajectory of the cutoff lever, and a return spring that forces the lock plate to move into the swing track of the cutoff lever against the return spring. A clutch interrupting and holding device comprising a manually operated lever that is protruded and moved to engage and hold the interrupting lever in the clutch's blocking position.