JPS5927545Y2 - multi-plate clutch - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a multi-disc clutch used in tractors and the like.

Conventionally, in this type of clutch, a spring presses an input side friction plate and an output side friction plate to connect the clutch, and a force in the opposite direction that exceeds the spring force is applied manually or mechanically, whereby both sides are connected. The clutch was disconnected by releasing the friction plate from the pressurized state.

However, in that case, the force in the blocking direction that can be obtained by manual or mechanical operation is relatively small, so it is necessary to set the force in the connecting direction by the spring to be small.
Therefore, there is a problem that the pressure force between the friction plates becomes small and the transmission torque capacity becomes low. Especially when the disconnection operation is performed manually, for example, a large force is required to press the clutch pedal, and the depression stroke becomes long. There was also the problem of

In some clutches, the clutch is connected by hydraulic pressure and disconnected by spring force.

However, in general, clutches used in tractors, etc., have an extremely long connection time compared to the disconnection time (for example, in the case of a clutch placed in the middle of the driving wheel drive system, most of the outside of the plate is connected during gear shifting, If the clutch is connected hydraulically for a long time, power for pressurizing the hydraulic oil must be applied substantially continuously to the hydraulic system, resulting in a problem that the power loss of the entire tractor becomes large.

In order to solve the above-mentioned problems, the present invention connects the clutch using a spring and disconnects it using hydraulic pressure.

The drawing is a schematic vertical cross-sectional view of the present invention, with the upper half showing the clutch disengaged state and the lower half showing the clutch engaged state.

In the drawing, a bottomed cylindrical clutch nozzle 2 that opens to the right is fixed to the right end of the input-side bubble 1, and a slit 5 in the axial direction (left-right direction in the drawing) provided in the cylindrical wall portion 3 of the housing 2. has a plurality of annular friction plates 6 (only two are shown).
A protrusion 7 on the outer peripheral edge of is fitted to be slidable in the axial direction.

A plurality of annular output-side friction plates 8 (only two are shown) are arranged between the input-side friction plates 60 and outside (on the left and right sides) of the friction plates 6 at both ends shown, alternating with the friction plates 6. A protrusion 10 on the inner peripheral edge of the friction plate 8 is slidably fitted into an axial groove 12 provided on the outer peripheral surface of the spline plate 11.

13 is an annular stopper fitted into the groove 12 of the spline bub 11, and is prevented from moving to the left by a snap ring 15 and a washer 16.

Reference numeral 18 denotes an output shaft, into which the hub 11 is fitted at a spline portion 20.

21 is a snap ring, and 22 is an annular plate for positioning the input cup 1.

An annular piston guide 25 spline-fitted to the output shaft 18 is disposed on the right side of the spline hub 11, and is fixed to the knob 11 with bolts 29.

The piston guide 25Vi has an integral cylindrical portion 26 projecting to the right, and the inner peripheral surface of an annular piston 27 is fitted into the cylindrical portion 26 via an annular seal 28. An outer circumferential cylindrical portion 30 of the piston 27 protruding toward the friction plate 8 is fitted onto the outer circumferential surface via an annular seal 31 .

A hydraulic chamber 32 between the piston guide 25 and the piston 2T communicates with an oil passage 37 in the casing 36 via an oil passage 33 provided in the cylindrical portion 26 and an annular oil groove 35, and the oil passage 37 is not shown. It is connected to a hydraulic power source via a hydraulic operating mechanism.

The casing 36 is fixed to or integrated with another housing (not shown), and is rotatably fitted into the cylindrical portion 26 via two annular seals 38.

39 is a snap ring that prevents the cylindrical portion 26 from moving to the right.

Reference numeral 40 denotes an annular spring bearing member fitted to the outer circumferential surface of the cylindrical portion 26, the right end surface of the inner circumferential portion abuts against the snap ring 41, and the left end surface of the inner circumferential portion abuts against the piston 21 when the clutch is released. (upper half of the figure), and an annular protrusion 42 protruding toward the friction plate 8 on the outer periphery supports the outer periphery of the disc spring 43.

The disc spring 43 (Ii is one or more disc springs stacked one on top of the other, and the inner peripheral edge engages with the stepped portion 45 of the piston 270.

Next, the operation will be explained.

When the clutch is connected, the external force and hydraulic pressure are released to reduce the pressure in the hydraulic chamber 32.

Then, as shown in the lower half of the figure, the piston 27 moves to the left due to the elasticity of the spring 43, and the friction plates 6 and 8 are moved to the stopper 1.
3 side, thereby pushing the input side and output side friction plates 6, 8
(Ii are in pressure contact with each other, and the torque transmitted from the input block 1 to the housing 2 is transmitted to the friction plate 6, friction plate 8, spline no.
The signal is transmitted to the output shaft 18 via the output shaft 11.

When the clutch is disengaged, hydraulic pressure is introduced into the hydraulic chamber 32 from the outside via the oil passage 33 or the like.

Then, as shown in the upper half of the figure, the piston 27 is connected to the spring 430.
It moves to the right against the elasticity and separates from the friction plate 8, and the pressing force between each friction plate 6.8 is released, and torque transmission is no longer performed.

As explained above, according to the present invention, since the clutch is disengaged by hydraulic pressure, the disengagement operation can be performed more easily and easily than when the clutch is disengaged manually.

Also, since it is possible to obtain a larger breaking force than in the case of a manual type or a mechanical type, it is possible to set a large pressure contact force that the spring 43 applies to the friction plates 6 and 8, and it is possible to increase the torque capacity. .

Since the clutch is connected by the force/spring 43, the power consumption for increasing the pressure of the hydraulic oil can be reduced, since this type of clutch has a much longer connection time than the disconnection time. can be reduced.

A piston guide 2 is installed inside the f'9 section 30 of the piston 27.
5, the entire device (especially the outer diameter) can be made compact.

[Brief explanation of drawings]

The drawing is a schematic longitudinal section of the present invention. 2...Clutch...Using, 3...
Cylindrical wall part, 6... Input side friction plate, 8...
・Output side friction plate, 11...spline knob,
13...Stock bar-125...Zeston guide, 27...Piston, 30...
Cylindrical part, 32... Hydraulic chamber, 33... Oil passage (part of hydraulic circuit), 43... Spring.

Claims (1)

[Scope of utility model registration request] Annular input-side friction plates and output-side friction plates are arranged alternately, and the outer periphery of the input-side friction plates is supported slidably only in the axial direction by the cylindrical wall of the bottomed cylindrical clutch housing. In a multi-disc clutch in which the inner periphery of the output side friction plate is supported by a bub so as to be slidable only in the axial direction, a piston is placed on the open end side of the club and chi housing, and the outer periphery of the piston is pressed against the friction plate. A cylindrical part is provided, a piston guide is placed inside the piston cylindrical part, a hydraulic chamber is formed to push the piston toward the side opposite to the friction plate, a hydraulic circuit is connected to the hydraulic chamber, and the piston is moved toward the friction plate. A multi-plate clutch characterized by having a biasing spring and a stopper at the end of the friction plate group opposite to the piston.