JPS6224827Y2 - - Google Patents

Description

[Detailed description of the invention] Wet multi-plate clutches, which are often used in industrial vehicles, press a driving plate that engages with the input shaft and a driven plate that engages with the output shaft using a piston that is reciprocated by hydraulic pressure. It is now possible to combine them.

Normally, when the 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 passage in the oil pipe that connects the cylinder in which the piston moves reciprocally 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 source become equal, and the pressing force of the piston suddenly increases.

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 kind, the conical plate can rotate freely, and as a result of use, 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. As a result, proper clutch action may be impaired.

As a known means for solving such problems, for example, as disclosed in Japanese Utility Model Publication No. 45-20091, the input shaft and the clutch drum are linked with a spline so that they cannot rotate relative to each other. In addition, by making all parts such as pistons that come into contact with the conical plate non-rotatable relative to the clutch drum, relative rotation between the conical plate and the members that come into contact with it is prevented, and wear caused by such relative rotation is prevented. By locking the outer peripheral edge of the conical plate from the beginning so that it cannot move in the axial direction with respect to the clutch drum, the conical plate can be prevented from catching on the worn part of the clutch drum as described above. Some devices are designed to eliminate the risk of malfunction.

However, with such conventional means, the piston and other members that contact the conical plate must be appropriately prevented from rotating relative to the clutch drum using splines, keys, etc., resulting in a complicated structure. The disadvantage of latching the outer peripheral edge of the conical plate to the clutch drum in an axially immovable manner is that the structure becomes more complicated.

The present invention relates to a wet type multi-plate clutch that eliminates the above-mentioned drawbacks, and will be described in detail below with reference to the accompanying drawings.

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 pressure source (not shown) via the inlet/outlet 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). . A plurality of recesses 11a are provided at appropriate locations on the front surface (outer surface) of the piston 11.

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. A pressure receiving plate 15 that engages with the engagement protrusion 3 and a retaining snap ring 16 are provided on the outside in order from the inside.

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

In the clutch of the present invention, an annular conical plate 17 made of an elastic material is provided between the drive plate 13 at the inner end and the piston 10, as shown in FIGS. 2 and 3.

The inner circumferential edge of the conical plate 17 is slightly inclined inward in the axial direction, and the inner circumferential edge has a plurality of sections that are generally parallel to the axis, face inward, and are divided in the circumferential direction. A locking piece 17a is provided in series. These locking pieces 17a are connected to the piston 1.
The conical plate 17 is engaged with the recess 11a in the piston 11, and by the engagement between the locking piece 17a and the recess 11a, the conical plate 17 is locked relative to the piston 11 so that it cannot rotate relative to the piston 11.

A plurality of protrusions 17b facing in the radial direction are arranged on the outer peripheral edge of the conical plate 17, and these protrusions 1
7b engages with the engagement groove between the engagement protrusions 3 of the clutch drum 2. This protrusion 17b and the engagement protrusion 3
By engaging with the engagement groove between the conical plate 1
7 is locked to the clutch drum 2 so that it cannot rotate relative to the clutch drum 2.

As a result, the piston 11 is linked to the clutch drum 2 through the conical plate 17 so as not to rotate relative to it.

In the above-described clutch, when oil is forced into the cylinder 8 through the inlet/outlet 9, the piston 11 moves forward, elastically deforming the conical plate 17 into a flat plate shape, increasing the pressing force of the piston 11, and starting to connect the clutch. do.

Then, just before the inner peripheral part of the conical plate 17 comes into pressure contact with the drive plate 13, the clutch is completely connected, so that the two come into contact with each other, 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 vehicle stops and the oil pressure in the cylinder 8 increases rapidly, the clutch has already been fully engaged, so the clutch engages smoothly and does not cause a shock to the vehicle.

Further, since the conical plate 17 rotates together with the clutch drum 2, the surface of the engagement protrusion on the clutch drum is not worn away by the relatively rotating conical plate, unlike in the conventional case described above. .

Moreover, the piston 11 has a conical plate 17
Since the piston 11 and the clutch drum 2 are connected in a non-rotatable manner through the clutch drum 2, unlike the conventional piston 11, an axial spline key or guide pin, etc., is required to prevent relative rotation between the piston 11 and the clutch drum 2. There is no need to provide one, which is convenient.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional side view of the main part of an embodiment of the clutch of the present invention, FIG. 2 is a front view of a half part showing the engaged state of the conical plate and the piston, and FIG.
FIG. 3 is a central longitudinal cross-sectional side view of the conical plate. 1...Input shaft, 2...Clutch drum, 3...
Engagement protrusion, 4... Output cylinder, 5... Engagement protrusion, 6...
...Gear, 7...Button, 8...Cylinder, 9
... Entrance/exit, 10... Oil feed hole, 11... Piston, 11a... Recess, 12... Compression spring, 13...
... Drive plate, 14 ... Driven plate, 15 ... Pressure receiving plate, 1
6...Snat spring, 17...Conical plate, 17a...Locking piece, 17b...Protruding piece.

Claims (1)

[Claims for Utility Model Registration] (1) A plurality of drive plates that are movably engaged in the axial direction on the inner surface of a clutch drum that is coaxial with the input shaft and rotates together with the input shaft, and on the inner side of the clutch drum. A plurality of driven plates, which are movably engaged in the axial direction, are alternately superimposed on the outer peripheral surface of an output cylinder coaxial with the clutch drum, and a pressure receiving plate is placed on the outer end of the clutch drum, and a pressure receiving plate is placed on the outer side of the clutch drum. In a wet type multi-plate clutch, the driving plate and the driven plate are pressed together by a retaining snap spring installed in the clutch drum and a piston operated by hydraulic pressure installed in the clutch drum. In between, there is an annular conical plate made of an elastic plate, the inner circumference of which is inclined toward the piston, and the outer circumference of which is provided with protrusions and the inner circumference of which is provided with locking pieces that face inward. provided, the protruding piece and the locking piece,
A wet-type multi-disc clutch that is engaged with a clutch drum and a piston, respectively. (2) A plurality of engagement protrusions are provided on the inner surface of the clutch drum in the axial direction for engaging the drive plate, and protrusions on the outer periphery of the conical plate are locked between adjacent engagement protrusions. A wet type multi-disc clutch according to claim (1) of the utility model registration claim. (3) A recessed portion is provided on the outer surface of the piston, and a locking piece on the inner peripheral edge of the conical plate is locked in the recessed portion, as set forth in claim (1) or (2) of the utility model registration claim. Wet multi-plate clutch.