JPS62233523A - Clutch device - Google Patents

Abstract

PURPOSE:To employ a dry frictional clutch irrespectively of a wet type unilateral clutch by placing an unilateral clutch from first to second clutch outers and a member for sealing between said unilateral clutch and a clutch board group between the first and second clutch outers. CONSTITUTION:When a push rod 28 does not function, clutch board groups 19-21 are pushed by a spring 24 against a pressure receiving board 22 to bring a frictional clutch Ca into a connected state. When an engine is operated under a positive load, the power is transmitted from a crankshaft 6 through first and second transmission paths A, B to an input shaft 8. Under quick decelerating condition, a counter load is transmitted from the wheel side to the engine side, but a frictional clutch Ca is slipped by means of an unilateral clutch disposed in the second transmission path B so as to prevent production of an excessive stress. Since the unilateral clutch Cb is blocked from a dry chamber 4b by means of the sealing members 31-33, a dry type unilateral clutch Cb causes no influence onto the dry type frictional clutch Ca.

Description

Detailed Description of the Invention A1 Objective of the Invention (1) Industrial Application Field The present invention relates to clutch devices installed in transmission systems of motorcycles, automobiles, etc. This invention relates to a clutch device that generates appropriate slippage in order to prevent excessive stress from occurring in various parts of a transmission system.

(2) Conventional technology Conventionally, such a clutch device combines a friction clutch and a one-way clutch, and when an excessive reverse load is applied, the capacity of the friction clutch is reduced by the disconnection action of the one-way clutch, causing the friction clutch to slip. A method for causing this phenomenon is already known (see Japanese Unexamined Patent Publication No. 159426/1983).

(3) Problems to be solved by the invention However, in conventional clutch devices, the one-way clutch that requires lubrication is placed inside the friction clutch, so a wet type is adopted in which the friction clutch is also immersed in lubricating oil. I have no choice but to do it.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a clutch device that can employ a dry type friction clutch even if the one-way clutch is a wet type.

B0 Structure of the Invention (1) Means for Solving Problems In order to achieve the above object, the present invention provides a first clutch outer connected to the drive side, and a first clutch outer that is capable of relative rotation on the same axis as the first clutch outer. a second clutch outer arranged;
A clutch inner surrounded by the first and second clutch outer and connected to the driven side, a first drive clutch plate slidably spline fitted to the first clutch outer, and a first drive clutch plate slidably fitted to the second clutch outer. A friction clutch is constituted by a second drive clutch plate that is spline-fitted, and a driven clutch plate that is slidably spline-fitted to the clutch inner and frictionally coupled to the first and second drive clutch plates,
A one-way clutch that enables torque transmission in only one direction from the first clutch outer to the second clutch outer is provided between the first and second clutch outer, and a seal is provided between the one-way clutch and the clutch plate group. It is characterized by interposing a sealing member such as an oil seal.

(2) Effect According to the above configuration, even if lubricating oil is supplied to the one-way clutch, the lubricating oil is prevented from penetrating into the clutch plate group of the friction clutch by the sealing member. Therefore, the friction clutch adopts a dry type. becomes possible.

(3) Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 is a casing of a power unit of a motorcycle, and inside thereof, a crank chamber 2 and a transmission chamber 3 are provided in front and behind each other. A clutch chamber 4 is provided adjacent to one side of the clutches 2 and 3. Further, the clutch chamber 4 is divided by a clutch cover 5 fixed to the casing 1 into a greenhouse 4a on the crank chamber 2 and transmission chamber 3 side, and a dry chamber 4b on the opposite side.

The greenhouse 4a communicates with the crank chamber 2 and the transmission chamber 3 at the bottom so that lubricating oil flows between them, but the dry chamber 4b has an oil seal 31, which will be described later.
~33 prevents lubricating oil from entering.

The crankshaft 6 of the engine is housed in the crank chamber 2, and the transmission 7 is housed in the transmission chamber 3, respectively. In addition, the clutch chamber 4 includes a dry friction clutch Ca and a wet one-way latch C.
A clutch device C consisting of a combination of b is housed, and in particular, a friction clutch Ca is housed in the dry room 4b. More greenhouse 4
A primary speed reduction device 10 is housed in a.

The primary reduction gear 10 includes a small-diameter drive gear 11 fixed to the crankshaft 6 and a large-diameter driven gear 13 rotatably supported by the input shaft 8 via a bearing bush 12.

The friction clutch Ca includes a first clutch outer 14 spline-coupled to the boss 13a of the driven gear 13, and a second clutch outer 14 that surrounds the first clutch outer 14 and is rotatably supported by the driven gear 13 and the first clutch outer 14. It includes a clutch outer 15 and a clutch inner 16 surrounded by both taratch outer members 14 and 15 and connected to the input shaft 8 by a spline.

The body 15a of the second clutch outer 15 extends outward from the outer end of the body 14a of the first clutch outer 14. A substantially identical spline member 17 is spline-fitted and fixed by a circlip 18. Two first drive clutch plates 19 are mounted on the body 14a of the first clutch outer 14, and the second clutch outer 1
5 spline members 17 and three second drive clutch plates 2
0 are slidably spline-fitted to each other, and four driven clutch plates 21 alternately overlapped with these clutch plates 19 and 20 are slidably fitted to the body portion 16a of the clutch inner 16.

The pressure receiving plate 22 is sandwiched between the clutch plates 19, 20 and 21 groups.
and a pressure plate 23 are arranged to face each other.

The pressure receiving plate 22 is integrally formed with the clutch inner 16, and the pressure plate 23 is slidably fitted to the body 16a of the clutch inner 16, and a plurality of clutch springs 24 (in the figure, one
(only one of which is shown) is ejected toward the pressure receiving plate 22. The clutch spring 24 is housed in a bottomed spring receiver 25 that is integrally formed with the pressure plate 23 and projects inside the body 16a of the clutch inner 16, and the outer end of the spring 24 passes through the spring receiver 25. It is supported by a seat plate 27 fixed to the tip of a support shaft 26 protruding from the clutch inner 6.

A bushing rod 28 passing through the hollow portion of the input shaft 8 is connected to the pressure plate 23 via a release bearing 29 so that the pressure plate 23 can be moved back as desired.

The one-way clutch cb is connected to the boss 14.15 of the first and second clutch outer 14.15. It is interposed between b and 15b. This one-way clutch cb is configured to enable torque transmission in only one direction from the first clutch outer 14 to the second clutch outer 15.

In the clutch chamber 4, in order to seal between the dry chamber 4b and the storage chamber 30 for the greenhouse 4a1 and the one-way clutch cb, bosses 141 of both clutch outers 14.15 are installed.
), the first oil seal 31 between the first clutch outer 14 and the clutch inner 16, the second oil seal 32 between the boss 14b of the first clutch outer 14 and the clutch inner 16, and the boss 1 of the second clutch outer 15.
5b and the third oil seal 33 between the thalassochi cover 5
are installed respectively.

On the other hand, the storage chamber 30 is communicated with the greenhouse 4a via an oil hole 34 formed in the boss 15b of the second clutch outer 15, a spline joint between the driven gear 12 and the first clutch outer 14, and the like.

To explain the operation of this embodiment, when the bushing rod 28 is inactive, the pressure plate 23 presses the group of clutch plates 19, 20° 21 toward the pressure receiving plate 22 with the elastic force of the clutch spring 24, so that the driving clutch plate The 19.20 group and the driven clutch plate 21 group are frictionally coupled. That is, the friction clutch Ca is in the connected state.

When the engine is operated with a positive load in this state, the power transmitted from the crankshaft 6 to the primary reduction gear 10 is transferred to the first clutch outer 14 , the first friction clutch plate 19 , and the driven clutch 21 . transmission path A, first clutch outer 14, one-way clutch cb, second clutch outer 15, spline member 17, second drive clutch plate 2
0 and a second transmission path B consisting of the driven clutch plate 21, the signal is transmitted to the clutch inner 16, and then to the input shaft 8 of the transmission 7. Therefore, in the friction clutch Ca, the clutch plates 19, 20, 21 polymers contribute to power transmission, so that the power can be reliably transmitted to the load side with almost no slippage even during high output operation of the engine.

Next, due to sudden deceleration operation (engine braking), a reverse load is applied from the wheel side to the input shaft 8 of the transmission 7 to the inner 16 of the vehicle.
When the reverse load is transmitted to the engine side, the reverse load tries to be transmitted to the engine side through the first and second transmission paths A and B, but the one-way latch cb in the second transmission path B receives the reverse load. , and the power is not transmitted from the second clutch outer 15 to the first clutch outer 14.
The reverse load is passed only through the first transmission path A to the primary reduction gear 1.
0, transmitted to the clutch shaft 6.

Therefore, in the friction clutch Ca, the only clutch plates that contribute to reverse load transmission are the first drive clutch plate 19 and some driven clutch plates 21 that cooperate with it, and the capacity of the friction clutch Ca is significantly reduced. If the reverse load increases excessively, friction clutch Ca will slip, and excessive stress in various parts of the transmission system can be prevented from occurring.

In this case, the one-way latch cb in the second transmission path B is the boss 14b of the first and second clutch outer 14.15.
, 15b, and the oil seal members 31, 32.
33, the communication with the dry chamber 4b is cut off, so even if the one-way clutch cb is lubricated with lubricating oil from the greenhouse 4a, the oil will not enter the dry chamber 4b, and therefore the friction clutch Ca will not be connected to the dry chamber 4b. However, it will not cause any inconvenience.

If the bushing rod 28 is pushed to the left in the figure, the pressure plate 2
3 moves backward against the elastic force of the clutch spring 24, so
The frictional coupling between the driving clutch plates 19 and 20 groups and the driven clutch plate 21 group is released, and the friction clutch Ca enters the disconnected state.

C1 Effects of the Invention As described above, according to the present invention, the first clutch outer connected to the drive side, the second clutch outer coaxially disposed to be relatively rotatable with the first clutch outer, and the first clutch outer a clutch inner surrounded by a second clutch outer and connected to the driven side; a first drive clutch plate slidably spline-fitted to the first clutch outer; and a first drive clutch plate slidably spline-fitted to the second clutch outer. A friction clutch is constituted by a second driving clutch plate, which is slidably spline-fitted to the clutch inner, and a driven clutch plate is frictionally coupled to the first and second driving clutch plates. Between the clutch outer parts, from the first clutch outer to the second clutch outer
A one-way clutch that enables torque transmission in only one direction to the clutch outer, and a sealing member such as an oil seal that seals between this one-way clutch and the clutch plate group are installed, so the one-way clutch and It is possible to seal between the clutch plate group and the clutch plate group using a sealing member, so that the friction clutch can be a dry type regardless of a wet type one-way clutch.

BRIEF DESCRIPTION OF THE DRAWINGS The drawing is a longitudinal sectional view showing an embodiment of a clutch device according to the present invention. C...Clutch device, Ca...Friction clutch, cb
...One-way clutch 2...Crank chamber, 4...Clutch chamber, 4a...
Greenhouse, 4b...dry room, 6...crankshaft, 7...
Transmission, 8...Input shaft, 14.15...1st. Second
Clutch outer, 19.20...1st. 2nd driving clutch plate, 21... Driven clutch plate, 22... Pressure receiving plate, 23... Pressure plate, 24... Clutch spring, 31...
・First oil seal as a seal member

Claims (1)

[Claims] A first clutch outer connected to the driving side, a second clutch outer coaxially arranged with the first clutch outer so as to be relatively rotatable, and a clutch surrounded by these first and second clutch outers and connected to the driven side. a first drive clutch plate that is slidably spline-fitted to the first clutch outer, a second drive clutch plate that is slidably spline-fitted to the second clutch outer, and a second drive clutch plate that is slidably fitted to the clutch inner. A friction clutch is constituted by driven clutch plates that are freely spline-fitted and frictionally coupled to the first and second driving clutch plates, and a first clutch plate is provided between the first and second clutch outer parts.
A one-way clutch that enables torque transmission in only one direction from the clutch outer to the second clutch outer, and a sealing member such as an oil seal that seals between the one-way clutch and the clutch plate group are interposed. A clutch device.