JPS597635Y2 - Hydraulic clutch device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a hydraulically operated clutch device, such as a wet multi-disc type clutch device, which alleviates the shock when the clutch is engaged.

Conventionally, in a wet multi-plate forward hydraulically operated clutch device as shown in FIG. When the hydraulic pressure is transmitted to the hydraulic pressure passage 19 in the clutch housing 12, the hydraulic pressure increases the hydraulic pressure in the hydraulic chamber indicated by b in the clutch housing 12, and compresses the spring 8 installed inside the hydraulic cylinder 9. While sliding the hydraulic cylinder 9 in the direction of the input shaft 1 in the direction of arrow B, the plurality of clutch friction plates 6 and the clutch housing held by a part of the inner circumference of the gear member 2A integrated with the output small gear 2 are removed. A plurality of steel plates 7, each of which has a part of its outer periphery, are crimped onto each of the 12 members,
The clutch is fully engaged.

Note that the output pinion 2 is rotatably supported on the input shaft 1 via a plain metal 3, and the friction plate holding plate shown by 5 in FIG. 1 is fixed to the clutch housing 12 with a circlip 4. has been done.

On the other hand, an O-ring 11 is fitted on the sliding surface between the input shaft 1 and the hydraulic cylinder 9, which constitute the working chamber b, and an O-ring 10 is fitted on the sliding surface between the hydraulic cylinder 9 and the clutch housing 12. Furthermore, the clutch housing 12 is supported by a tapered roller bearing 13.

In addition, in the pressure oil system diagram shown in FIG. 1, 22 is a safety valve, and the pressure oil that flows out from the safety valve 22 is returned to the pressure oil tank as shown by arrow T.
Pressure oil that has passed through the lubricating oil cooler 24 via the primary pressure regulating valve shown by is supplied as lubricating oil to each lubricating section shown by arrow L, and the pressure oil flowing out from the secondary pressure regulating valve 25 is also compressed as shown by arrow T. It is designed to be returned to the tank.

Further, the hydraulic pressure switching valve 21 can switch the pressure oil between the forward clutch direction indicated by arrow F and the reverse clutch direction indicated by R.

Therefore, in the conventional wet multi-disc hydraulically operated clutch device, the shock caused when a load is suddenly applied by the hydraulic switching valve 21 is absorbed only by the natural sliding of the clutch friction plates 6. is large, and the normal load is 3
A peak load of twice to four times more will be applied to those related parts, resulting in damage to the gear member 2A and damage to the clutch friction plate 6.
There was a drawback that problems such as wear and tear occurred.

Therefore, since each of the above-mentioned parts needs to be made sturdy, there is a drawback that it is not possible to reduce the size and weight of these parts.

Therefore, in order to eliminate the above-mentioned conventional drawbacks, the present invention aims to alleviate the shock at the time of clutch engagement by changing the rising pattern of the clutch operating oil pressure when the clutch of a hydraulically operated clutch device is engaged. be.

That is, the present invention provides a hydraulically operated clutch device having a hydraulically actuating cylinder 9 that is operated via a hydraulic switching valve 21, in which a hydraulic oil passage 1 that communicates between the hydraulically actuating cylinder 9 and the hydraulically operating cylinder 9 is provided.
A buffer chamber a is provided in the buffer chamber a, and within the buffer chamber a, a buffer cylinder 15 equipped with a throttle valve 18 and a check valve is fitted so that a piston can slide into the hydraulic oil passage by the hydraulic pressure of the buffer cylinder a. This is achieved by forming the buffer chamber a to have a smaller volume than the working chamber b of the hydraulic actuating cylinder 9.

An embodiment of the present invention will be described below with reference to FIG. 2, in which the same parts as in the conventional example of FIG. 1 are indicated by the same part numbers.

The embodiment of the present invention shown in FIG. 2 shows a wet multi-plate forward hydraulic clutch device having almost the same structure and function as the conventional example shown in FIG. 1, but the differences are as follows. A buffer chamber a is provided in the hydraulic oil passage 19 that communicates the hydraulic switching valve 21 and the hydraulic operating cylinder 9, and a buffer cylinder 15 is disposed within the buffer chamber a. 2
The hydraulic oil passage 19 is pressed by pressure oil from one side, and the spring 14 is inserted into the opposite side.
It is possible to slide in the direction.

The buffer cylinder 15 also has a spring 16 fixed to one end thereof, and a ball 17 capable of closing the throttle valve 18 and its hydraulic passage.
This buffer cylinder 15 is equipped with a check valve having a
is the arrow A due to the change in the working oil pressure by the oil pressure switching valve 21.
It is designed to perform a piston movement as shown in .

Further, the buffer chamber a has a smaller volume than the working chamber b of the hydraulic cylinder 9.

Next, the operation of the hydraulic clutch device according to the embodiment of the present invention will be explained in comparison with the conventional example shown in FIG.

First, a line diagram shown in FIG. 3 in which the horizontal axis represents the time T when a load is applied by the hydraulic switching valve 21 in the conventional example shown in FIG. 1, and a similar line diagram in the embodiment of the present invention shown in FIG. To explain this with reference to FIG. 4 which shows As shown in FIGS. 3 and 4, each hydraulic pressure diagram X rapidly rises from point M to point N, and in the conventional example shown in FIG. The hydraulic pressure diagram Y in the working chamber b suddenly moves from point M to point N in the same way as the hydraulic pressure diagram X. rise to

On the other hand, in the embodiment of the present invention shown in FIG. 2, the buffer cylinder 15 installed in the buffer chamber a moves in the direction shown by the arrow A from point O' to point P' on the stroke diagram Z' in FIG. The hydraulic cylinder 9 is pressed through the hydraulic oil passage 19 and the working chamber b.

Here, as mentioned above, the volume of the buffer chamber a is the working chamber b.
Since the volume of the actuating tube 9 is smaller than that of the clutch friction plate 6, the amount of movement of the actuating tube 9 can be reduced to just before the clutch friction plate 6 is pressed. is moved slowly by only the hydraulic oil passing through the throttle valve 18 and presses against the clutch friction plate 6.

From there, by gently pressing the play caused by the minute gap between the clutch friction plate 6 and the gap caused by the warpage of the steel plate 7, the force pressing the clutch friction plate 6 also increases gradually, and the sudden force of the hydraulic switching valve 21 increases. Even when a load is applied, the shock is reduced.

That is, in FIG. 4, the hydraulic cylinder 9 rapidly moves from point O to point P on its stroke diagram Z, and then slowly moves from point P to point Q, and as a result, the operation in the working chamber b decreases. The hydraulic pressure diagram Y also rises gradually from point M' to point N', and the time t from point M' to point N' is
The hole diameter of 8 can be selected to suit the hydraulic clutch device.

Also, as can be seen from the diagram S showing the output torque and thrust in this case, compared to the conventional example shown in Fig. 3, the embodiment of the present invention shown in Fig. 4 has a Shock can be further reduced.

In the embodiment of the present invention shown in FIG. 2, when the load is cut off, the pressure in the buffer chamber a rapidly approaches zero by switching the hydraulic switching valve 21, and the spring 14 closes the buffer cylinder 1.
5 moves rapidly, the hydraulic pressure in the working chamber b drops rapidly, and the hydraulic cylinder 9 also moves rapidly by the spring 8 to a point where the pressure becomes negative, disengaging from the clutch friction plate 6, and the load is cut off.

Moreover, after the hydraulic cylinder 9 moves by the volume of the buffer chamber a, the throttle valve 18, the spring 16 and the ball 17
Pressure oil escapes from the hydraulic passage of the check valve, and the hydraulic cylinder 9 is pushed by the spring 8 and moved to a predetermined position.

According to the present invention, a buffer chamber a is provided in the hydraulic oil passage 19 that communicates the hydraulic switching valve 21 and the hydraulic cylinder 9, and a buffer cylinder equipped with the throttle valve 18 and the check valve is provided in the buffer chamber a. Since the piston 15 is slidably fitted to the piston, the rising pattern of the hydraulic pressure acting on the hydraulic cylinder 9 can be made smooth, and the shock caused when a sudden load is applied can be reduced.

In addition, by reducing the shock, the strength of each part of the clutch device can be set to a low level, making it possible to reduce the size and weight of these components. It is possible to reduce the occurrence of defects such as serration wear and increase the reliability of the clutch device.

In addition, since the volume of the buffer chamber a is smaller than the volume of the working chamber b of the hydraulic cylinder 9, the amount of movement of the hydraulic cylinder 9, which is activated by the movement of the buffer cylinder 15, is adjusted just before the clutch friction plate is pressed. Therefore, the hydraulic cylinder 9 can be moved suddenly until the clutch friction plate is pressed, and thereafter it can be moved smoothly only by the hydraulic oil passing through the throttle valve 18. , the force for pressing the clutch friction plate increases gradually, and even when the load on the hydraulic pressure switching valve 21 is abruptly applied, the shock can be reduced.

Also, when the load is cut off, the hydraulic cylinder 9 can be rapidly moved by the volume of the buffer chamber a, so that the clutch device can be quickly disengaged when the load is cut off.

Note that the present invention can be effectively applied to a wet type multi-disc clutch device that is mainly operated by hydraulic pressure.

[Brief explanation of the drawing]

FIG. 1 is a sectional side view of a main part of a conventional hydraulically operated forward clutch device, FIG. 2 is a side sectional view of a main part of a hydraulically operated forward clutch device according to an embodiment of the present invention, and FIGS.
The figures are diagrams showing the working oil pressure, the stroke of the hydraulic cylinder, the stroke of the buffer cylinder, the output torque, and the thrust of the forward clutch devices shown in Figs. 1 and 2, respectively, when the load is applied. 1...Input shaft, 2...Output small gear, 6
...Clutch friction plate, 9...Hydraulic cylinder, 12...Clutch housing, 15...
...Buffer tube, 16...Spring, 17...
... Ball, 18 ... Throttle valve, 19 ...
... Hydraulic oil passage, 21 ... Hydraulic switching valve, a.
...Buffer chamber, b...Working chamber.

Claims (1)

[Scope of utility model registration request] In a hydraulic clutch device having a hydraulic cylinder 9 operated via a hydraulic switching valve 21, a buffer chamber a is provided in a hydraulic oil passage 19 that communicates the hydraulic switching valve 21 and the hydraulic cylinder 9, and the buffer chamber A buffer cylinder 15 equipped with a throttle valve 18 and a check valve is fitted into the buffer chamber a so that the piston can slide in the direction of the hydraulic oil passage by the hydraulic pressure thereof, and the buffer chamber a is connected to the working chamber of the hydraulic cylinder 9. A hydraulically operated clutch device with a smaller volume than b.