JPS594570B2 - Hydraulic release mechanism for vehicle clutch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hydraulic release mechanism for a vehicle clutch, and particularly relates to a bushing rod that passes through the axis of an input shaft in a transmission, and a hydraulic release mechanism that engages with one end of the bushing rod. This invention relates to an improvement in a hydraulic release mechanism, which is equipped with a hydraulic cylinder that pushes a rod in the axial direction toward the other end, and in which engagement of the vehicle clutch is released by pushing the bushing rod by the hydraulic cylinder.

Generally, in the above type of release mechanism, hydraulic pressure
The hydraulic oil in the IJ cylinder is oil with different properties from the lubricating oil in the transmission, and if this hydraulic oil enters the transmission, it may cause damage to the rubber seals used in the transmission. The component may swell and lose its function.

The purpose of the present invention is to eliminate such problems, to make it possible to easily and cleanly attach and detach the hydraulic cylinder independently of the transmission, and to improve the durability of the hydraulic cylinder. It is something to do.

An embodiment of the present invention will be described below based on the drawings.

In Fig. 1, a crankshaft 1 of an automobile engine is shown.
0 and the input shaft 31 of the transmission 30, a friction clutch 20 is interposed between the friction clutch 20 and the input shaft 31 of the transmission 30.
is disengaged by a hydraulic release mechanism 40 according to the present invention.

The friction clutch 20 is housed in a transaxle case 51, and includes a clutch cover 21 fixed to the crankshaft 10, a flywheel 22 fixed to the clutch cover 21, and a rotation direction connected to the clutch cover 21 via a strap 23. A pressure plate 24 is integrally and movably assembled in the axial direction, a diaphragm spring 25 biases the pressure plate 24 toward the flywheel 22, and a diaphragm spring 25 is spline-fitted onto the input shaft 31 to connect the flywheel. 22 and a clutch disk 26 held between pressure plates 24.

The transmission 30 includes an input shaft 31 and an output shaft 32 parallel to the input shaft 3LK.
It is equipped with a transaxle case 51, a transmission case 52, and a transmission case cover 53.
It is built into a casing 50 which contains a required amount of lubricating oil.

The input shaft 31 is the transaxle case 51
and a pair of bearings 61 in the transmission case 52.
62, and its right end extends to the right through an oil seal 71, and the friction clutch 2
0 clutch disc 26 is supported.

Also, a through hole 31 is provided at the axis of the input shaft 31.
A is provided in the through hole 31a, and a bushing rod 41 of a release mechanism 40 is installed in the through hole 31a with both ends thereof protruding outward.

The output shaft 32 is the transaxle case 5
1 and a pair of bearings 63 in the transmission case 52
It is rotatably supported via an angle 64, and a final reduction gear 32a is provided at its right end.

Note that the first gear 31 is mounted on the input shaft 31.
b, reverse drive gear 31g, second speed gear 31c,
3rd gear 31d, 4th gear 31e, 5th gear 31
A synchronizer device 31h for VC 3-4 speeds arranged in f row is provided, and on the output shaft 32 are a first speed gear 32b, a reverse gear 32g, a second speed gear 32c, a third speed gear 32d, a fourth speed gear 32e, 5th gear 32f
A synchronizer device 32h for 1st-2nd speed and a synchronizer device 32i for 5th speed are provided.

The release mechanism 40 includes a bushing rod 41, a hydraulic cylinder 80 that engages with the left end of the bushing rod 41 and pushes the rod to the right in the axial direction, and a hydraulic cylinder 80 that engages with the right end of the bushing rod 41 and pushes the rod in the axial direction. and a release plate 42 that transmits movement in the axial direction of the friction clutch 20 to the diaphragm spring 25 of the friction clutch 20.

The bushing rod 41 is rotatably and axially movably supported by the input shaft 31 via a bearing 65 at the right end, and a cup-shaped retainer 43 and a bearing 4 at the left end.
4 is rotatably supported by a piston 81 of a hydraulic cylinder 80, and its right end protrudes to the right through an oil seal 12 and is connected to a central recess 42a of the release plate 42.
is engaged in.

In this embodiment, as shown in an enlarged view in FIG. 2, the bushing rod 41 protrudes outward from the transmission case cover 53 through the oil seal 73 at the left end in a liquid-tight manner, and is connected to the hydraulic cylinder. 80, and the hydraulic cylinder 80 is slidable liquid-tightly in the axial direction through a cylinder housing 82 formed in a cup shape and a piston cup 83 within the cylinder housing 82. The piston 81 is fitted into the piston 81.

The cylinder housing 82 has a port 82a connected to a hydraulic power source (not shown) at its closed end.
As clearly shown in the figure, both flanges 82b are provided at the open end.

The transmission case cover 53Vc is removably attached to the transmission case cover 53Vc by bolts 82bVc and 84, respectively.

The piston 81 forms an oil chamber R1 in which a port 82a opens at the closed end of the cylinder housing 82, and
An air chamber R that communicates with the outside through a communication hole 90 at the open end.
2, and is biased to the right by a return spring 85 whose one end is locked to the cylinder housing 82.

Also, a projection 8 is provided at the bottom of the left end of this piston 81 in FIG.
1a is formed, and this protrusion 81a is fitted into a groove 82c provided in the axial direction on the inner wall of the cylinder housing 32 so as to be slidable in the axial direction, thereby regulating the rotation of the piston 810.

Further, in this embodiment, a communication hole 90 that communicates the air chamber R2 with the outside is connected to a groove 91 having a U-shaped cross section provided diagonally downward at the lower part of the open end of the cylinder housing 82 and an outer surface of the mission case cover 53. The upper end opens to the lower part of the air chamber R2, and the lower end opens to the outside adjacent to the raised part 53aK of the mission case cover 53.

The raised portion 53a is formed by accommodating the fifth speed gear 32f and the fifth speed synchronizer device 32i within the mission case cover 53.

The groove 91 extends to the flange portion 82b of the cylinder housing 82, making the communication hole 90 relatively long.

In the release mechanism 40 configured as described above, when pressure oil is supplied from the hydraulic source into the oil chamber R1, the piston 81 moves to the right to push the bushing rod 41 to the right, and the bushing rod 41 moves through the release plate 42. to tilt the inner peripheral edge of the diaphragm spring 25 to the right.

For this reason, the flywheel 22 and pressure plate 2
4 disappears, and the friction clutch 20 is disengaged.

By the way, in this embodiment, the cylinder housing 82 is attached to the mission case cover 53 with bolts 84, and the cylinder housing 82 and the piston 8
A piston cup 83 is interposed between the transmission case cover 53 and the bushing rod 41, and an oil seal 73 is interposed between the transmission case cover 53 and the bushing rod 41. By removing the bolts 84, the cylinder housing 82 can be easily removed from the transmission case cover 53. The hydraulic oil in the chamber R1 and the lubricating oil in the casing 50 can be removed independently without leaking, and when maintaining and inspecting the hydraulic cylinder 80, there is no need to extract the lubricating oil, making the maintenance and inspection work extremely easy. Not only is it easy, but it can also be done cleanly.

Furthermore, in this embodiment, the piston cup 830
Even if the hydraulic oil in the oil chamber R□ leaks into the air chamber R2 due to a malfunction, the hydraulic oil flows down along the inner wall of the cylinder housing 82 and also flows out of the communication hole 90.

For this reason, hydraulic oil rarely adheres to the oil seal γ3 (and never enters the casing 50, and the rubber seal member used in the casing 50 of the transmission (not shown in the figure) Seal members such as oil seals 71, 72, 73, etc.) do not swell due to hydraulic oil and properly perform their sealing function for a long period of time.

Furthermore, in this embodiment, the lower end of the communication hole 90 that communicates the air chamber R2 with the outside is connected to the mission case cover 53.
The bulge 53a of the transmission case cover 53 prevents water and mud from entering the communication hole 90.

Note that even if water or mud enters the lower end of the communication hole 90,
Since the communication hole 90 is long and sloped, water and mud do not enter into the cylinder housing 82.

Therefore, problems caused by water or mud entering the cylinder housing 82 (for example, rusting, jamming in sliding parts, etc.) do not occur, and the piston 81 can smoothly slide inside the cylinder housing 82. is maintained for a long period of time.

Further, in this embodiment, the protrusion 81a of the piston 81
and the groove 82c of the cylinder housing 82 are connected to the piston 81.
The durability of the piston cup 83 and return spring 85 is improved by regulating zero rotation.

As a result, the durability of the hydraulic cylinder 80 is improved.

FIG. 5 is a view showing another embodiment of the hydraulic cylinder, in which the retainer that receives one end of the bushing rod 41 is integrally formed with the inner race 144a of the bearing 144, and the piston rotates 1810 times. The movement is restricted by an axial groove 181a provided on the outer periphery of the piston 181 and an axial protrusion 188a of the sleeve 188 that is fitted into the cylinder housing 182 and is prevented from being removed by a screw 189.
This is done by engaging with.

Thereby, in this embodiment as well, the same functions and effects as in the above embodiment can be obtained.

Note that the present invention includes a bushing rod that passes through the axis of an input shaft in a transmission, and a hydraulic cylinder that engages one end of the bushing rod and pushes the rod in the axial direction toward the other end. The present invention can be implemented by appropriately modifying various hydraulic release mechanisms in which the clutch for the vehicle is disengaged by pushing a bushing rod by a hydraulic cylinder.

As detailed above, in the present invention, in the various hydraulic release mechanisms described above, one end of the bushing rod is liquid-tightly protruded outside the casing of the transmission via an oil seal, while the hydraulic cylinder is connected to the closed end. A cylinder housing has a port connected to a hydraulic power source and is removably attached to the casing at its open end, and one end of a bushing rod is fitted into the cylinder housing so as to be slidable in the axial direction via a piston cup. and a piston that engages with the piston to form an oil chamber with a port opening at the closed end of the cylinder housing, and an air chamber at the open end, and the air chamber is connected to the bottom of the air chamber at the upper end. Its feature is that it communicates with the outside through a communication hole that opens to the outside near the protrusion provided in the casing at the lower end. It is possible to prevent the hydraulic oil from entering the transmission, and prevent the rubber sealing member used in the transmission from swelling due to the hydraulic oil. The hydraulic cylinder can be easily and cleanly attached and detached independently of the transmission, and the durability of the hydraulic cylinder can be improved.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional plan view showing one embodiment of the present invention, FIG. 2 is an enlarged view of the main part of the present invention shown in FIG. 1, and FIG.
4 is a vertical sectional view taken along the line ■--■ in FIG. 3, and FIG. 5 is a vertical sectional view showing another embodiment of the hydraulic cylinder. Explanation of symbols, 20...Friction clutch, 30...
...Transmission device, 31...Input shaft, 40...Hydraulic release mechanism, 41...
... Bush rod, 50 ... Casing of transmission, 53a ... Protrusion provided on casing, 73 ... Oil seal, 80 ...
Hydraulic cylinder, 81... Piston, 82...
...Cylinder housing, 82a...Port, 83...Piston cup, 90...
Communication hole, R1... oil chamber, R2... air chamber.

Claims (1)

[Claims] 1 A bushing rod using a hydraulic cylinder, comprising a bushing rod that passes through the axis D of an input shaft in a transmission, and a hydraulic cylinder that engages one end of this bushing rod and pushes the rod in the axial direction toward the other end. In the hydraulic release mechanism, one end of the bushing rod is liquid-tightly protruded outside the casing of the transmission via an oil seal, while the hydraulic The cylinder is fitted into a cylinder housing which has a port connected to a hydraulic power source at the closed end and is removably attached to the casing at the open end, and is slidably fitted in the cylinder housing in the axial direction via a piston cup. a piston that is inserted and engaged with one end of the bushing rod to form an oil chamber in which the port opens at the closed end of the cylinder housing, and an air chamber at the open end; communicates with the outside through a communication hole that opens at the lower end of the air chamber at the upper end and opens to the outside near the protrusion provided in the casing at the lower end. Release mechanism.