JPS6224825Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a wet type multi-plate clutch that is often used in industrial vehicles and the like.

[Conventional technology]

In a conventional clutch of this type, a driving plate that engages with the input shaft and a driven plate that engages with the output shaft are pressed together by a piston that is reciprocated by hydraulic pressure.

[Problem that the invention aims to solve] Normally, when a clutch is fully engaged quickly, it gives a shock to the vehicle, so it slips for a while and then
A smooth engagement is desirable, which requires a continuous increase in the piston pressure until the clutch is fully engaged.

However, with a wet multi-disc clutch, the pressure from the hydraulic source is not directly transmitted to the piston while oil is being sent to the cylinder, due to resistance to oil passing through the oil pipe that connects the cylinder in which the piston moves back and forth and the hydraulic power source. At the moment when the forward movement stops and the oil supply to the cylinder stops, the pressures of the cylinder and the hydraulic power source become equal, and the pressing force of the piston suddenly increases suddenly.

For example, as a means to solve this problem,
Some devices have an elastic annular conical plate interposed between the drive plate and the piston to smoothly connect the clutch.

However, in conventional devices of this type, the conical plate rotates freely, so the surface of the engagement protrusion on the clutch drum is worn out by the conical plate, and the conical plate gets caught on the worn part, causing the proper The clutch action could be impaired.

[Means for solving problems]

The present invention relates to a wet type multi-plate clutch that solves these problems, and is coaxial with the input shaft.
A plurality of drive plates are movably engaged in the axial direction with the inner circumferential surface of the clutch drum that rotates together with the clutch drum, and a plurality of drive plates are engaged in the axial direction with the outer circumferential surface of the output cylinder coaxial with the clutch drum inside the clutch drum. A plurality of driven plates movably engaged with each other are alternately overlapped, and a pressure receiving plate is provided at the outer end of the clutch drum, and a snap spring for preventing slipping is provided on the outer side of the plate, and the clutch drum is actuated by hydraulic pressure provided inside the clutch drum. In a clutch that has a piston that presses a driving plate and a driven plate together, the inner peripheral edge of a snap spring made of an elastic material is oriented in the centripetal direction, slightly inclined inward, and has a piston on the centripetal side end. A plurality of tongue-shaped elastic pieces each having a locking piece facing inward in the axial direction are arranged in series, and each locking piece is locked in an engagement groove provided in the pressure receiving plate.

〔Example〕

FIG. 1 shows the main parts of the clutch according to the present invention. 1 is an input shaft, 2 is a clutch drum that is non-rotatably fitted on the input shaft 1, and 3 is a cut on the inner surface of the clutch drum 2. A plurality of engagement protrusions 4 facing in the axial direction are coaxial with the input shaft 1, and an output cylinder 5 having a smaller diameter than the inner diameter of the clutch drum 2,
These are a plurality of engagement protrusions cut into the outer surface of the output cylinder 4 and facing in the axial direction.

6 is integral with the output cylinder 4 and is connected to the bush 7.
A gear 8 fitted externally to the input shaft 1 so as to be rotatable with respect to the input shaft 1 is a cylinder formed in the inner part of the clutch drum 2.

Reference numeral 9 denotes an oil inlet/outlet, and the inside of the cylinder 8 is communicated with a hydraulic power source (not shown) via an input/output input 9 and an oil feed hole 10 formed in the input shaft 1 .

Reference numeral 11 denotes a piston fitted into the cylinder 8, and is pressed rearward, that is, inward, by a compression spring 12 wound around the outside of the piston 11 on the input shaft 1 (left side in FIG. 1).

Reference numerals 13 and 14 denote a drive plate and a driven plate which are respectively engaged with the engagement protrusion 3 of the clutch drum 2 and the engagement protrusion 5 of the output cylinder 4 so as to be movable in the axial direction, and which are overlapped alternately. be.

The above members are similar to those of a known wet type multi-disc clutch.

On the outside of the driven plate 14 at the outer end, a pressure receiving plate 15 and a retaining snap spring 16 made of an elastic material are disposed in order from the inside, as will be described later. It engages with the engagement protrusion 3 of the drum 2, and the outer peripheral edge of the snap ring 16 engages with an annular groove 18 cut into the outer end of the engagement protrusion 3.

As shown in FIGS. 2 and 3, the inner peripheral edge of the snap spring 16 is arranged at equal intervals in the circumferential direction, faces in the centripetal direction, and has an inner peripheral end that is slightly inclined inward. At the centripetal end, a plurality of tongue-shaped elastic pieces 16a are arranged in series, each of which includes a locking piece 16b that extends in the axial direction and faces inward.

Each of the locking pieces 16 on the inner peripheral edge of the pressure receiving plate 15
At the location corresponding to b, there is an engagement groove 1 facing in the radial direction.
7 is cut out.

The locking piece 16b engages with the engagement groove 17, and the outer peripheral portion of the snap spring 16 and the pressure receiving plate 15 are slightly spaced apart from each other.

In the above-mentioned clutch, when oil is forced into the cylinder 8 through the inlet/outlet 9, the piston 11 moves forward, elastically bending the snap ring 16 into a flat plate shape, increasing the pressing force of the piston 11, and starting to connect the clutch. .

Then, just before the pressure receiving plate 15 and the outer periphery of the snap spring 16 come into pressure contact, the clutch is completely engaged, so that both come into pressure contact and the forward movement of the piston 11 is stopped, and at the same time, the flow of oil into the cylinder 8 is stopped. Even if the oil pressure in the cylinder 8 suddenly increases, since the clutch has already been completely engaged, the clutch engages smoothly and does not cause a shock to the vehicle.

The snap ring 16 performs the function of the conical plate described above, and also rotates together with the clutch drum 2 via the pressure receiving plate 15. Therefore, the rotation of the conical plate with respect to the clutch drum as described above causes the engaging protrusion of the clutch drum to rotate. There is no risk that the surface will be abraded.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional side view of the main part showing one embodiment of the clutch of the present invention, Fig. 2 is a front view of a half part showing the engaged state of the pressure receiving plate and the snap spring, and Fig. 3 is
FIG. 3 is a central longitudinal cross-sectional side view of the snap spring. 1...Input shaft, 2...Clutch drum, 3...
Engagement protrusion, 4... Output tube, 5... Engagement protrusion, 6...
...Gear, 7...Button, 8...Cylinder, 9
...Inlet/outlet, 10...Oil feed hole, 11...Piston, 12...Compression spring, 13...Drive plate, 14...
... Driven plate, 15 ... Pressure receiving plate, 16 ... Snap spring, 16a ... Elastic piece, 16b ... Locking piece, 1
7... Engagement groove, 18... Annular groove.

Claims (1)

[Scope of Claim for Utility Model Registration] A plurality of drive plates that are movably engaged in the axial direction with the inner peripheral surface of a clutch drum that is coaxial with the input shaft and rotates together with the input shaft, and on the inside of the clutch drum, A plurality of driven plates, which are movably engaged in the axial direction, are alternately overlapped with the outer peripheral surface of the output cylinder coaxial with the clutch drum. In a clutch that is provided with a locking snap spring and has a piston operated by hydraulic pressure installed in the clutch drum to press the driving plate and the driven plate, the inner peripheral edge of the snap ring made of an elastic material faces in the centripetal direction. At the same time, a plurality of tongue-shaped elastic pieces are arranged in series, each of which is slightly inclined inward and has a locking piece facing inward in the axial direction at the end on the centripetal side, and each locking piece is attached to a pressure receiving plate. A wet type multi-disc clutch that is engaged with an engagement groove provided in the.