JPH01288630A - Wet clutch device - Google Patents

Abstract

PURPOSE:To reduce an idle running torque and to prevent the dragging rotation of a driven shaft by interposing the spring means separating adjacent prime moving side clutch plates at the outside of a driven side clutch plate located between the prime moving side clutch plates. CONSTITUTION:An oil chamber 21 is formed by a pulley 15, hob 13 and the cover 20 integrated with the pulley 15. A wave washer 40 is respectively inserted by locating at the outside of a driven side clutch plate 25 and between prime moving side clutch plates 23. The wave washer 40 is wavy in a free state, displaying the spring force separating adjacent prime moving side clutch plates 23. An idle running torque can thus be reduced and the dragging rotation of a driven shaft can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD The present invention relates to a wet-type multi-disc clutch device, and more particularly to a wet-type multi-disc clutch device suitable for application to a type of device in which a driving shaft is driven via a pulley.

"Prior art and its problems" Clutch devices are broadly classified into dry type and wet type. The dry type has the advantage of being compact, but it has problems such as poor durability of the friction part of the clutch, large shocks to the connecting parts, and foreign objects easily entering between the clutch plates. On the other hand, in the wet type, the clutch plates are encapsulated in oil, which eliminates the disadvantages of the dry type to some extent. That is, the durability of the clutch friction part is high, the connection base is small, and the connection is smooth. However, due to its structure, it is difficult to meet the demands for miniaturization.
In particular, the axial dimension becomes large. Furthermore, under severe usage conditions, it is difficult to cool the oil and coil, and a special cooling device is required.

Against this background, the present applicant has developed a wet clutch device that can meet the demand for miniaturization while retaining the advantages of wet clutches, and has filed a patent application (Patent Application No. 1, 1983).
No. 63177). This wet clutch device was completed based on the idea of using the pulley that is generally used as the drive shaft as it is as the oil chamber housing of the wet clutch. A pulley is provided so as to be able to rotate freely relative to the pulley, and the pulley, the hob side member, and the cover integrated with the pulley form an oil chamber, and the pulley or the cover is positioned within the oil chamber to move in the axial direction. A clutch plate on the driving side that is movably supported and a clutch plate on the driven side that is movably supported in the axial direction on the driven shaft side member are provided so as to be able to come into contact with each other, and the clutch plate on the driving side and the driven side are provided with an adhesion force that provides an adhesion force. It is characterized in that it is provided with a connecting means.

This wet type clutch device is compact because the oil chamber is formed inside the rotating pulley and the cover, and because the oil always rotates with the pulley, there is little oil deterioration. It has excellent features such as good heat dissipation because it can be installed outside the room.

However, in this wet clutch device, when the drive side (pulley) is rotating, the enclosed oil is always located at the outer periphery of the oil chamber due to the centrifugal force acting on the oil chamber, and the viscosity of this oil causes a so-called dragging phenomenon. occurs. In other words, even in the disconnected state, the driven side rotates as the driving side rotates, and a certain amount of idling torque is unavoidable.However, in the above-mentioned wet clutch device proposed by the applicant, even in the disconnected state, the driven side rotates. is located on the outer periphery of the oil chamber, so the grinding caused by this idling torque is large and cannot be ignored.

``Object of the Invention'' Therefore, the present invention aims to reduce the idling torque in the disconnected state in the wet clutch device proposed by the present applicant in Japanese Patent Application No. 62-163177, thereby minimizing the dragging phenomenon as much as possible. The purpose is to

"Summary of the Invention" The present invention provides that, in the above-mentioned wet clutch device, sealed oil is located on the outer periphery of the oil chamber, so in order to prevent chafing due to the viscosity of this oil, This was completed based on the recognition that it is effective to separate these clutch plates.

That is, in the present invention, a pulley is provided on the outer periphery of a hob that is integrated with the driven shaft so as to be rotatable relative to the hob, and the oil chamber is controlled by this pulley, the hob side member, and the cover integrated with the pulley. a driving side clutch plate which is positioned in the oil chamber and supported so as to be axially movable on a pulley or a cover; and a driven side which has a smaller diameter than the driving side clutch plate and is supported so as to be axially movable on a hob side member. Spring means is provided so as to be able to come into contact with and separate from the clutch plates, and is located between these driving side clutch plates and outside of the driven side clutch plates to apply a biasing force in a separating direction between adjacent driving side clutch plates. The present invention is characterized in that it is further provided with close contact means for applying a close contact force to the clutch plates on the driving side and the driven side against the spring force of the spring means.

The spring means may consist of a wave washer or a wave wire which is wavy in its free state and has a planar shape or a slight wavy shape which is thinner than the driven clutch plate in its compressed state.

Further, the spring means can also be constructed from a cut and raised spring piece formed by cutting and raising a part of the outer periphery of the driving side clutch plate.

Furthermore, the spring means may be constructed from a sub-assembly spring material that connects the driving side clutch plates and is formed from a leaf spring material that is thinner than the driven side clutch plates. This sub-assembly stiffener includes clutch plate locking portions that are locked to the outer periphery of a plurality of drive-side clutch plates and are arranged at alternately different radial positions;
It has a connecting elastic part that connects the clutch plate locking parts and has a continuous V-shape in the free state. This sub-assembly spring material has the advantage that it is possible to simultaneously convert the drive-side clutch plate into a knob-assembly. The connecting elastic portion of this sub-assembly member exerts a spring force that separates adjacent driven-side clutch plates, thereby preventing a dragging phenomenon.

"Embodiments of the Invention" The present invention will be described below with reference to illustrated embodiments. FIG. 1 shows an embodiment in which the wet clutch device of the present invention is applied to a clutch device for a car cooler compressor. Housing 11
(J) A driven shaft 12 connected to the compressor is rotatably supported, and a hob 13 is integrally connected to the end of the driven shaft 12.

On the other hand, a driven shaft 1 is connected to the housing 11 via a bearing 14.
A pulley 15 located on the outer periphery of 2 is rotatably supported. An oil seal 16 is provided between the pulley 15 and the hob 13.

A cover 20 is fixed to the pulley 15 via a fixing screw 18, and the cam 20, the pulley 15, and the hob 13 form an oil chamber 21.

Therefore, the pulley 15 and the cover 20 constitute a driving side member, and the driven shaft 12 and the hob 13 constitute a driven side member. A clutch plate located within the oil chamber 21 is supported by this driving force (p1) and the driven member.

That is, a plurality of axial protrusions 22 are formed on the inner periphery of the end of the pulley 15 on the cover 20 side, as shown in FIG. The groove 23b is fitted in a spline shape and supported so as to be movable in the axial direction. This driving side clutch plate 23 rotates together with the pulley 15 in the rotational direction. On the other hand, a spline (a plurality of axial protrusions) 24 is formed on the outer periphery of the hob 13 on the cover 20 side, as shown in FIG. A groove 2511 is fitted so as to be movable in the axial direction. This driven side clutch V&25 rotates integrally with the hob 13 in the rotational direction.

The driving side clutch plates 23 and the driven side clutch plates 25 are stacked alternately, and an armature 26 having a spline hole 26a fitted in the spline 24 is attached to the outer end thereof.
is supported so as to be movable in the axial direction. 27 is a ring that prevents the amateur 26 from being removed. Drive side clutch plate 2
3 is naturally larger in diameter than the driven side clutch plate 25.

The pulley 15 has an annular groove 28 that is open on the housing 11 side and matches the circumferential positions of the driving side clutch plate 23, driven side clutch plate 25, and armature 26.
is formed in the annular groove 28, and the housing 1
A coil 30 fixed to 1 via a bracket 29 is located. A magnetic path forming hole 3 is bored in the pulley 15 so that m fluxes of the coil 30 reach the armature 26 via the driving side clutch plate 23 and the driven side clutch plate 25. This Nfi path forming hole 31 is closed by a sealing material 32 made of a non-magnetic material to ensure the airtightness of the oil chamber 21.

The latch plates 23 and 25 are also provided with EH path forming holes 23a and 25a whose positions in the circumferential direction coincide with the magnetic path forming hole 31.

The above basic structure was created by the author of the patent application filed in 1983-163177.
In addition to this, the present invention further provides a wet clutch device between the driving side clutch plates 23,
A feature is that a wave washer 40 is inserted at the outer side of the driven side clutch plate 25, respectively.

In the free state, the wave washer 40 is wavy as shown in FIG. 4, and exerts a spring force that separates the adjacent driving side clutch plates 23.
When an adhesion force is applied between them, the clutch plates 23 and 25 on the driving side and the driven side form a flat plate shape or a slightly wavy shape, and do not prevent the clutch plates 23 and 25 on the driving side and the driven side from coming into close contact with each other. Therefore, this wave washer 40
is smaller than the thickness of the driven side clutch plate 25.

The present wet clutch device having the above structure is used by removing the cover 20, pouring an appropriate amount of oil into the oil chamber 21, and then closing the cover 20. First, when the pulley 15 is rotationally driven by the engine while the coil 30 is not energized, the cover 20 and the driving side clutch plate 23 rotate together with the pulley 15 . Since the coil 30 is not energized, the armature 26 is not attracted, so the driving side clutch plate 23 and the driven side clutch plate 25 slip, and no rotation is transmitted to the hob 13 (driven shaft 12).

In this unconnected state, the wave washer 40
Due to its springiness, adjacent driving side clutch plates 23 are separated. As a result, a gap is forcibly formed between the driving side clutch plate 23 and the driven side clutch plate 25, so that the dragging phenomenon caused by the rotation of the driven side clutch plate 25, that is, the driven shaft 12 due to the viscosity of the sealed oil, is reduced. , the idling torque becomes smaller.

On the other hand, when the coil 30 is energized, the pulley 15, the coil 30, the driving side clutch plate 23, and the driven side clutch plate 2
5 and the armature 26, a magnetic flux shown by a schematic closed curve A in FIG. 1 is generated, and the armature 26 is attracted to the pulley 15 side. Due to this suction force, the driving side clutch plate 23
and the driven side clutch plate 25 are in strong contact and rotate together,
The hob 13 and the driven shaft 1 together with the driven side clutch plate 25
2 rotates. Therefore, the compressor connected to the driven shaft 12 is driven.

The wave washer 40 has a thickness thinner than the thickness of the driven side clutch plate 25, and is compressed and deformed by the adjacent driving side clutch plates 23 that are attracted. This does not adversely affect the adhesion between the clutch plates 23 and 25.

FIG. 5 shows an annular wave wire 41 as a spring means for applying a spring force to separate the drive-side clutch plates 23. As shown in FIG. This annular wave wire 41 differs from the wave washer 40 in that its material is wire, but it is wavy in a free state and provides a spring force that separates adjacent driving side clutch plates 23, and this is compressed. It is the same as the wave washer 40 in that the thickness in the flat or wavy state, that is, the wire diameter is smaller than the thickness of the driven side clutch plate 25.

Furthermore, FIGS. 6 and 7 show another embodiment of the spring means.

This embodiment is characterized in that a portion of the clutch plate itself is cut and raised to form spring pieces 42 at a plurality of locations, preferably three or more locations on the outer circumference of the driving side clutch plate 23. It is something to do. This cut-and-raised spring piece 42 is located on the outside of the driven clutch plate 25, and in a free state comes into elastic contact with the flat portion 23c of the adjacent driven clutch plate 23 and functions to separate them. When compressive force is applied, the clutch plate 25 is elastically deformed in a direction within the plate thickness of the drive side clutch plate 25, so that the close contact between the drive side and driven side clutch plates 23 and 25 is not hindered.

Next, in FIG. 8 and FIG. 9, by the subassembly spring material 43,
This is an embodiment in which the drive-side clutch plate is made into a sub-assembly at the same time. This subassembly spring material 43 is made of a leaf spring material thinner than the driven side clutch plate 25, and is bent into a continuous V-shape. Each apex portion is connected to a locking groove 4 formed on the outer periphery of the driving side clutch plate 23.
4 constitutes a clutch plate locking portion 45 that is locked, and a connecting elastic portion 46 is configured between these clutch plate locking portions 45. Therefore, the adjacent clutch plate locking parts 45 are locked to the driving side clutch plate 23 at alternately different positions in the circumferential direction, and the connecting elastic part 46 applies a spring force in the direction of separating the adjacent driving side clutch plates 23. to act.

A plurality of sub-assembly spring members 43, preferably three or more, are provided on the periphery of the drive-side clutch plate 23. Then, the plurality of driving side clutch plates 23 are formed into a sub-assembly by the sub-assembly spring material 43, so that assembly becomes easy. And in the state of use, it is not connected,
The connecting elastic portion 46 acts to separate the adjacent driving side clutch plates 23, and in the connected state, the connecting elastic portion 46 is elastically deformed to fit within the plate thickness of the driven side clutch plate 25, so that the driving side and the driven side are separated. Close contact between side clutch plates 23 and 25 (
J unhindered.

In order to facilitate the assembly of this wet clutch device, the retaining ring 27 is fixed to the hub 13.
Fit the Amadeur 26, then alternately fit the driving side clutch plate 23, driven side clutch plate 25, and wave washers 40 (annular wave wire 41) (if these are used), and then use the stop washer 50 to prevent them from being removed. It is preferable to fit this subunit onto the pulley 15.

When using the subassembly spring material 43, the clutch plate locking portion 45 of the subassembly spring material 43 is locked in the locking groove 44 on the outer periphery of the driving side clutch plate 23 when the subunit is assembled. . This →knob assembly stiffener 43 allows the radial groove 2 of the driving side clutch plate 23 to
3b can be arranged.

In the above embodiments, the pulley 15 is described as the driving side and the driven shaft 12 is used as the driven side, and this usage is common in practice. is available. In the main text and claims, a driving side and a driven side have been distinguished for convenience in order to clarify the structure, but this does not mean that the present invention does not include such a method of use.

"Effects of the Invention" As described above, the present invention utilizes a pulley and a cover fixed to the pulley as a part of the oil chamber housing of a wet clutch, and disposes the driving side and driven clutch plates inside the pulley. In a wet type clutch device using a wet type clutch, a spring means for separating adjacent driving side clutch plates is provided between the driving side clutch plates and on the outside of the driven side clutch plates, so that idling torque can be reduced. As a result, dragging rotation of the driven side clutch plate, that is, the driven shaft in the disconnected state can be prevented.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the wet clutch device of the present invention.
A front view with the upper half sectioned, FIGS. 2 and 3 are cross-sectional views taken along lines II-II and Ill-Ill in FIG. 1, respectively, and FIG. 4 shows an example of the shape of a single wave washer. 5 is a perspective view showing an example of the shape of a single wave wire, FIG. 6 is a perspective view showing an example of a cut spring piece formed on the driving side clutch plate itself, and FIG. A plan view showing the elastic contact state of the driving side clutch plate adjacent to the spring piece;
FIG. 8 is a perspective view showing a state in which the driving side clutch plate is connected by the subassembly spring member, and FIG. 9 is a plan view thereof. 11. Housing, 12. Driven shaft, 13. Hob.
14. Bearing, 15. Pulley, 16. Oil seal, 18. Fixing screw, 20. Cover, 21. Oil chamber.
22・Axial projection, 23・Drive side clutch plate, 24・
... Spline, 25... Driven side clutch plate, 26.
・・Amadeur, 28・Annular groove, 29・Bracket, 30・Coil, 31・Magnetic path forming hole, 32・Sealing material, 40・Wave washer, 41・Annular wave wire, 42・Cut Raising spring piece, 43.-Zubbutsu spring material, 44..Latching groove, 45..Clutch plate locking portion, 4
6. Connecting elastic part.

Claims (2)

[Claims] (1) A pulley is provided on the outer periphery of the hob that is integrated with the driven shaft so that it can rotate freely relative to the hob, and this pulley, the hob side member, and the cover integrated with the pulley form an oil chamber. , a driving side clutch plate located in the oil chamber and supported so as to be axially movable on a pulley or a cover, and a driven side clutch plate having a smaller diameter than the driving side clutch plate and supported on a hob side member as axially movably supported. and a spring means positioned between these driving side clutch plates and outside of the driven side clutch plates to apply a biasing force in a direction of separation between adjacent driving side clutch plates, A wet type clutch device further comprising a close contact means for applying a close contact force to the driving side and driven side clutch plates against the spring force of the spring means. (2) The spring means is composed of a sub-assembly spring material formed from a leaf spring material thinner than the driven-side clutch plate, and the sub-assembly spring material is fixed to the outer periphery of the plurality of driving-side clutch plates, and is arranged in a radial direction alternately. It has clutch plate locking parts at different positions and a connecting elastic part that connects the clutch plate locking parts, forming a continuous V-shape in the free state, and this connecting elastic part connects the adjacent driven side. The wet clutch device according to claim 1, which exerts a spring force that separates the clutch plates.