JP2002276687A - Clutch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a clutch miniaturizing a whole body by shortening the axial directional length than that of a multiplate type clutch while securing a large frictional force. SOLUTION: A driving member 2 and a driven member 4 have a coaxial rotary central shaft N, the driving member 2 is formed with a wedge-shaped projection part 9 taperedly projecting toward the side of the driven member 4, and the driven member 4 is disposed with a friction member 11 formed with a V-shaped groove 13. The wedge effect exerted when the wedge-shaped projection part 9 is inserted in and press-contacted with the V-shaped groove 13 enlarges the frictional force between wedge-shaped projection part 9 and the V-shaped groove 13 so as to enlarge the transmission torque from the driving side to the driven side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a friction type clutch, which can be used, for example, in a power transmission path in a transportation means such as an automobile or a ship, or in a driving force transmission means in an industrial machine such as a press device. It is.

[0002]

2. Description of the Related Art A transmission of a motor vehicle and its accessories are provided with a friction clutch for connecting and disconnecting power transmission between an engine and wheels. The basic principle and structure of a friction clutch are that a driving member and a driven member whose rotation center axes are coaxial are arranged to face each other in the axial direction, and the frictional force generated by the pressure contact between the driving member and the driven member. Although the rotation of the drive member is transmitted to the driven member, the conventional friction clutch is a multi-plate type in which a plurality of friction plates, which are the drive member or the driven member, are arranged side by side in the axial direction. The friction force is increased so as to obtain a large friction torque for transmitting to the wheels.

[0003]

According to such a multi-plate clutch, the axial length of the entire clutch is increased by the number of friction plates arranged in parallel in the axial direction. The size and weight of the housing accommodated in the vehicle have been increased, which is one of the factors that hinder the improvement of the fuel efficiency of the automobile.

[0004] Further, with respect to a clutch used in a machine, apparatus, equipment, etc. other than an automobile, if the clutch is a multi-plate clutch, the axial length of the entire clutch becomes longer, so that the machine, It is difficult to make the entire device, equipment, etc. larger and smaller.

SUMMARY OF THE INVENTION An object of the present invention is to provide a clutch capable of reducing the axial length of the clutch as compared with a multi-plate clutch while securing a large frictional force, thereby enabling the overall size to be reduced. is there.

[0006]

In the clutch according to the present invention, a driving member and a driven member whose rotation center axes are coaxial are arranged to face each other in the axial direction, and the driving member and the driven member are connected to each other. In a clutch in which the rotation of the driving member is transmitted to the driven member by frictional force due to pressure contact, one of the driving member and the driven member is provided with a wedge-shaped projection that is tapered toward the other. The wedge-shaped projection has a V-shaped groove corresponding to the wedge-shaped projection and pressed against the wedge-shaped projection.

In this clutch, the driving member is moved by moving the driving member toward the driven member, by moving the driven member toward the driving member, or by moving the driving member and the driven member toward each other. And a wedge-shaped projection provided on one of the driven members comes into pressure contact with a V-shaped groove formed on the other, and the rotation center axis of the wedge-shaped projection and the V-shaped groove is centered. Due to the relative rotation, the rotation of the driving member is transmitted to the driven member by the frictional force between the wedge-shaped protrusion and the V-shaped groove, and when the wedge-shaped protrusion is pressed against the V-shaped groove, the V-shaped groove is pressed. The pressing force acting at right angles to the tapered surface of the groove increases due to its wedge effect. Since a frictional force for rotating the driven member is generated based on the pressing force, a large torque can be transmitted from the driving member to the driven member as in the case of the multi-plate clutch, and the axial length of the entire clutch is smaller than that of the multi-plate clutch. Can be shortened.

Therefore, it is possible to reduce the size and weight of the entire machine, device, equipment, etc. using the clutch according to the present invention.

In the clutch according to the present invention, the other one of the driving member and the driven member in which the V-shaped groove is formed may be made of a single material, and the V-shaped groove may be formed directly in this. Considering that a large frictional force and a large amount of frictional heat are generated due to the large frictional force, the other is formed including a base member and at least one friction member disposed on the base member. It is preferable to provide the V-shaped groove in this friction member having excellent wear resistance and heat resistance, which is formed of a material mainly composed of, a sintered metal material, or a non-asbestos material.

[0010] In this case, at least a part of the wedge-shaped projection is formed by the relative rotation of the V-shaped groove and the wedge-shaped projection around the rotation center axis. It is preferable to provide a non-contact portion that does not come into contact with.

In this case, at least a part of the wedge-shaped projection may not contact the V-shaped groove. At this time, at least a part of the wedge-shaped projection is cooled.
Generation of large frictional heat can be suppressed, and the durability and life of the wedge-shaped projections and the friction member can be improved.

The provision of such a non-contact portion on the other side can be performed by various means. In one example, the number of friction members is plural, these friction members are arranged in a circle around the rotation center axis on a base member, a space is provided between these friction members, and this space is contactless. Department. In another example, the number of friction members is set to one, and the friction members are arranged on the base member as a missing circular ring centered on the rotation center axis. Department.

When a plurality of friction members are arranged on the base member in a circle around the rotation center axis as in the former case, these friction members may be immovably arranged on the base member. The member may be disposed so as to be movable in a radial direction about the rotation center axis.

When a plurality of friction members are arranged on the base member so as to be movable in a radial direction about the center axis of rotation, when the wedge-shaped projection is provided on one of the driving member and the driven member, the center of rotation is reduced. Even if there is some error in the formation position of the wedge-shaped projections with respect to the shaft, this error can be absorbed by moving the respective friction members in the radial direction, and each of the friction members is accurately positioned on the base member. There is no need to place them in position.

In the case where the other of the driving member and the driven member having the V-shaped groove includes the base member and at least one friction member disposed on the base member as described above, The friction member can be disposed on the base member by forming a concave portion having a depth direction in the axial direction in the base member and inserting at least a part of the axial thickness of the friction member into the concave portion.

When at least a part of the axial thickness of the friction member is inserted into the recess formed in the base member as described above, the friction member may be fixed to the recess with an adhesive. Instead, the friction member may be fixed to the recess by driving or press-fitting. When the latter is adopted, it is not necessary to consider the heat resistance of the adhesive. Of course, the friction member may be fixed to the recess by both an adhesive and driving or press-fitting.

When the friction member is attached to the base member by inserting at least a part of the axial thickness of the friction member into a concave portion formed in the base member, the friction member generally having a brittle property is removed. The advantage that reinforcement can be achieved with the base member is obtained.

The depth of the recess formed in the base member can be arbitrarily determined according to the axial thickness of the friction member.
One example is that the depth of the recess is defined as the depth at which the portion of the wedge-shaped projection that escapes from the V-shaped groove due to the relative rotation of the V-shaped groove and the wedge-shaped projection about the rotation center axis does not interfere with the base member. It is to be.

According to this, since the portion of the wedge-shaped protrusion that has escaped from the V-shaped groove does not contact the friction member and the base member, the above-mentioned non-contact portion for cooling at least a part of the wedge-shaped protrusion is provided. The base member can be provided only by setting the depth of the concave portion, and it is not necessary to perform a special processing operation for providing a non-contact portion in the base member.

When the depth of the concave portion is made deeper than that described above, the base member escapes from the V-shaped groove by relative rotation of the V-shaped groove and the wedge-shaped projection around the rotation center axis. A groove into which the portion of the wedge-shaped protrusion penetrates is formed, and the size of the groove is set to a size where a gap is formed between the groove and the wedge-shaped protrusion.

According to this, the portion of the wedge-shaped projection that has escaped from the V-shaped groove enters the groove of the base member, and a gap is formed between the groove and the wedge-shaped projection. As a result, at least a part of the wedge-shaped protrusion does not come into contact with the friction member and the base member. That is, the groove of the base member becomes the non-contact portion provided on the base member, and at least a part of the wedge-shaped protrusion is cooled in this groove.

When the depth of the concave portion is set to such a depth, the depth is larger than the depth of the above-described example, and therefore, the base of the friction member disposed on the base member by being inserted into the concave portion. The strength of attachment to the member can be increased.

In the case where the wedge-shaped projection provided on one of the driving member and the driven member is pressed against the V-shaped groove formed on the other, the other is moved to one side, In order to secure the pressure contact between the V-shaped groove and the wedge-shaped projection, it is necessary to prevent one from moving in the same direction as the other. For this purpose, a receiving member for receiving one of the movements on the side opposite to the other is arranged at an axial position sandwiching one with the other, and this receiving member is on the same side as the other for the driving side and the driven side. Member.

In the case where the clutch according to the present invention includes such a receiving member, the mechanical relationship and the structural relationship between the one member and the receiving member can be arbitrary.

A first example is to provide a friction reducing member between one of the members and the receiving member for reducing rotational friction between the one and the receiving member. According to this, the frictional force for transmitting the rotation of the driving member to the driven member can be limited to the frictional force due to the wedge effect between one and the other.

A second example is to provide a friction member having a planar shape perpendicular to the axial direction on at least one of the one and the receiving member. According to this, the frictional force for transmitting the rotation of the driving member to the driven member, the frictional force due to the wedge effect between one and the other, and the frictional force due to the frictional member having a planar shape between one and the receiving member It can be sum with force.

In a third example, on one side, a first wedge-shaped projection, which is the wedge-shaped projection, and a second wedge-shaped projection, which is tapered toward the receiving member, are provided. Also, a V-shaped groove having a shape corresponding to the second wedge-shaped projection and pressed against the second wedge-shaped projection is formed. According to this, the frictional force due to the wedge effect is generated between one and the other and between the one and the receiving member, and the frictional force for transmitting the rotation of the driving member to the driven member can be increased.

In the above, the wedge-shaped projection provided on one of the driving member and the driven member may be formed continuously in a ring shape around the center axis of rotation.
It may be formed discontinuously around the rotation center axis.

The clutch according to the present invention described above may have a dry structure to which no oil is supplied, or a semi-wet structure to which an oil mist is supplied.
It may have a wet structure in which an oil liquid is supplied and filled.

Further, the clutch according to the present invention can be interposed in any driving force transmission path in any machine, device, or equipment, and is used, for example, as a clutch of a transmission of an automobile or a clutch of a differential device. Further, in the press device, in order to move up and down members such as a slide and a ram by a motor driving force, the press device can also be used as a clutch in a driving force transmitting unit connecting the motor and the up and down member.

[0031]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, a spline 1A is formed on an outer peripheral surface of a hub member 1 serving as a driving-side member, and an uneven portion 2A of an inner diameter portion of the driving member 2 is engaged with the spline 1A. At 1A, it rotates integrally with the hub member 1 and is slidable in the axial direction. Further, a spline 3A is formed on the inner peripheral surface of the ring member 3 which is a member on the driven side.
Then, the uneven portion 4A of the outer diameter portion of the driven member 4 and the uneven portion 5A of the outer diameter portion of the receiving member 5 are engaged, and the ring member 3 rotates integrally with the driven member 4 and the receiving member 5 by a spline 3A. At the same time, the driven member 4 and the receiving member 5 are slidable in the axial direction.

The center axis of rotation of the hub member 1, drive member 2, ring member 3, driven member 4, and receiving member 5 is N, and these are rotatable about this center line N. The member 1, the driving member 2, the ring member 3, the driven member 4, and the receiving member 5 are coaxially arranged. Further, the driven member 4 and the receiving member 5 are disposed at both sides of the driving member 2 in the axial direction, and the driven member 4 and the driving member 2 and the driving member 2 and the receiving member 5 face each other in the axial direction. I have.

At the axial position opposite to the driving member 2 with respect to the receiving member 5, a stopper 6 by a snap ring is provided.
The stopper 6 is fixed to the spline 3 </ b> A of the ring member 3, so that the receiving member 5 slides toward the stopper 6 to the position of the stopper 6.

An elastic member 7 made of a disc spring is disposed at an axial position on the opposite side of the driven member 2 with respect to the driven member 4, and is further provided at an axial position on the opposite side of the driven member 4 with respect to the elastic member 7. The piston rod 8 of the hydraulic cylinder is disposed so as to be able to advance and retreat in the axial direction.

Driving member 2 far away from rotation center axis N
Is formed with a wedge-shaped projection 9 tapering toward the driven member 4. The driven member 4 includes a base member 10 and a friction member 11, and the base member 10
A concave portion 12 having a depth in the axial direction is formed at a position facing the wedge-shaped projection 9 in the axial direction, and a friction member 11 is inserted into the concave portion 12, and the friction member 11 is driven into the concave portion 12. And press-fitting, or an adhesive, or driving, pressing, and fixing with an adhesive. The friction member 11 has a V-shaped groove 13 having a shape corresponding to the wedge-shaped projection 9 and into which the wedge-shaped projection 9 is inserted and pressed.

The wedge-shaped projection 9 is formed continuously on the drive member 2 in a ring shape over the entire circumference centered on the rotation center axis N. The friction member 11 is as shown in FIG. In addition, a plurality of the friction members 11 are circularly arranged on the base member 10 around the rotation center axis N, and thus are arranged at regular intervals in the circumferential direction about the rotation center axis N. Since there is an interval between the friction members 1
1 are apart from each other. Between these friction members 11, the base member 10 has a V-shaped groove 1 of the friction members 11.
A groove 14 having a shape such as a V-shape or a rectangle that is continuous with 3 is formed. The width of the groove 14 is larger than the width of the V-shaped groove 13.

The driven member 4 having the above structure is manufactured as follows. First, while rotating the base member 10 about the rotation center axis N, a groove 14 is continuously formed on the base member 10 over the entire circumference of the base member 10 with a cutting tool, or the cutting tool is moved to the rotation center axis N. The groove 14 is continuously formed over the entire circumference of the base member 10 by rotating the base member 10 around the center. Thereafter, concave portions 12 are provided at predetermined positions of the base member 10, and the friction members 11 are inserted into these concave portions 12 and fixed with an adhesive.
While rotating about the rotation center axis N, the operation of forming the V-shaped groove 13 on each friction member 11 with a cutting tool or a grinding tool is performed, or the cutting tool or the polishing tool is rotated about the rotation center axis N. The operation of forming the V-shaped groove 13 in each friction member 11 is performed by rotating the friction member 11.

As a result, the V-shaped groove 13 which is a part of a circle can be formed concentrically and accurately on each of the friction members 11 arranged apart from each other on the base member 10.

As shown in FIG. 1, a thrust bearing 15 is provided between the driving member 2 and the receiving member 5, and the thrust bearing 15 rotates between the driving member 2 and the receiving member 5. It is a friction reducing member for reducing friction.

The friction member 11 in this embodiment is formed by laminating a plurality of base fabrics coated and impregnated with a mixture of carbon and other raw materials, and subjecting them to a solidification treatment at a high temperature and a high pressure. It is made of carbon-based material, so it has great abrasion resistance,
Has heat resistance. The driving member 2 according to the present embodiment is formed by pressing a metal plate such as mild steel. When the wedge-shaped projection 9 is given a hardness of a predetermined value or more, the hardness may be obtained by work hardening at the time of press-molding the wedge-shaped projection 9, or the driving member 2 may be subjected to soft nitriding or the like. It may be obtained by performing a curing treatment.

When the piston rod 8 advances toward the elastic member 7, the elastic member 7 elastically presses the driven member 4 toward the driving member 2, whereby the driving member 2 is pushed toward the receiving member 5. Since the member 5 stops at the stopper 6, the driving member 2 is received by the receiving member 5. Thereby, the wedge-shaped projection 9 and the V-shaped groove 13 are pressed against each other by an axial thrust force. When the piston rod 8 retreats, this pressure contact is released.

When the driving member 2 is rotated by the rotation of the hub member 1 before or after the wedge-shaped projection 9 is pressed against the V-shaped groove 13, the rotation of the driving member 2 is controlled by the wedge-shaped projection 9 and the V-shaped groove. 13 is transmitted to the driven member 4 by the frictional force, that is, the clutch enters the connected state. At this time, the receiving member 5 on the driven side is also rotated integrally with the driven member 4 by the rotation of the ring member 3, but in this embodiment, a thrust bearing 15 is interposed between the driving member 2 and the receiving member 5. Therefore, the rotation of the driving member 2 is not transmitted to the driven side via the receiving member 5, and the rotation of the driving member 2 is transmitted to the driven side only via the driven member 4.

On the other hand, when the pressing of the wedge-shaped protrusion 9 against the V-shaped groove 13 is released, the frictional force between the wedge-shaped protrusion 9 and the V-shaped groove 13 disappears, and the clutch is disconnected.

FIG. 2 is a dynamic diagram when the wedge-shaped projection 9 is pressed against the V-shaped groove 13. In this figure, it is assumed that the thrust force F acts from the drive member 2 side to the driven member 4 side, and the wedge-shaped projection 9 is pressed against the V-shaped groove 13 by the thrust force F, as described in FIG. The same applies to the case where the thrust force acts on the driven member 4 side from the driven member 4 side. On the outer diameter side taper surface 13A and the inner diameter side taper surface 13B of the V-shaped groove 13, based on the thrust force F,
A pressing force Q perpendicular to these tapered surfaces 13A, 13B acts on the outer tapered surface 9A and the inner tapered surface 9B of the wedge-shaped projection 9. These pressing forces Q become Q = F / (2 · sin θ) due to the wedge effect of the wedge-shaped projection 9 having the taper angle θ.

Since θ is smaller than 90 degrees and sin θ is smaller than 1, each Q has a value larger than F / 2.

The frictional force T generated between the wedge-shaped projection 9 and the V-shaped groove 13 is equal to the wedge-shaped projection 9 and the V-shaped groove 1.
When the coefficient of friction with No. 3 is μ, T = 2 μQ. For this reason, a large frictional force can be generated between the wedge-shaped projection 9 and the V-shaped groove 13, and based on this frictional force,
The transmission torque from the driving member 2 to the driven member 4 also increases.

Incidentally, when θ is 30 degrees, Q
= F, the frictional force T at this time is twice as large when θ is 90 degrees, in other words, when the clutch is a flat friction clutch.

The taper angle θ of the wedge-shaped projection 9 can be determined according to the type of the machine, device, and equipment in which the clutch is used, the material of the driving member 2, and the like.
When the thrust force F disappears, an axial slip occurs between the wedge-shaped projection 9 and the V-shaped groove 13 so that the pressed state is released. It can be a corner.

As described above, according to the present embodiment, the driving member 2 is provided with the wedge-shaped projection 9, and the driven member 4 has a shape corresponding to the wedge-shaped projection 9, Since the V-shaped groove 13 to which the projection 9 is pressed is formed, when the wedge-shaped projection 9 to which the clutch is connected and the V-shaped groove 13 are pressed, a large frictional force can be generated by a wedge effect, and a large torque can be generated. Can communicate.
Also, unlike this multi-plate clutch,
Because it is not to obtain a plurality of friction plates side by side in the axial direction,
The axial length of the clutch can be shorter than that of the multi-plate clutch, and the overall size, weight, and weight of the machine, device, and equipment using the clutch can be reduced.

Since a large frictional force can be generated by the wedge effect, a large torque can be transmitted without increasing the distance from the rotation center axis N to the wedge-shaped projection 9 and the V-shaped groove 13. As a result, the radial dimension of the entire clutch from the rotation center axis N can be reduced, and the size of the machine, the device, and the device using the clutch as a whole can be reduced in this direction.

Further, since a large frictional force can be obtained by the wedge effect even if the thrust F is not large, the means for generating the thrust F, in this embodiment, the hydraulic pressure of the above-mentioned hydraulic cylinder for driving the piston 8 is increased. There is no need, and high-pressure hydraulic pressure generating means can be omitted.

Further, the driven member 4 is formed by disposing the friction member 11 on the base member 10. As shown in FIG. 3, the friction member 11 in which the V-shaped groove 13 is formed is a base member. The driven member 4 is the same as the driving member 2 due to the frictional force between the wedge-shaped projection 9 and the V-shaped groove 13 because a plurality of the driving members 2 are arranged in a circle around the rotation center axis N at intervals. The rotation speed of the driving member 2 and the rotation speed of the driven member 4 are different from each other until the rotation at the rotation speed or the braking force acts on the driven side, that is, the wedge-shaped projection 9 and the V When relative rotation occurs between the wedge-shaped protrusions 13, the respective circumferential portions of the wedge-shaped projections 9 do not sequentially contact the friction members 11, and these portions become base portions between the friction members 11. The groove formed in the member 10 The groove 14 sequentially reach the fourth position
Has a larger width dimension than the V-shaped groove 13 and has a wedge-shaped projection 9.
Merely penetrates the groove 14, and a gap is formed between the wedge-shaped projection 9 and the groove 14. For this reason, the groove 14 between the friction members 11 is a non-contact portion of the driven member 4 in which each circumferential portion of the wedge-shaped protrusion 9 is not in contact with the friction member 11 sequentially.
The respective parts of the wedge-shaped protrusion 9 reaching the position are cooled at the position of the groove 14. For this reason, it is possible to prevent the driving member 2 from being excessively heated by frictional heat, and it is possible to improve the durability and life of the driving member 2 and the friction member 11.

Further, according to the present embodiment, the friction member 11
Is arranged on the base member 10 by being inserted into the concave portion 12 of the base member 10. Therefore, even if the friction member 11 has a brittle property, the friction member 11
0, the friction member 11 can be reinforced by the base member 10.

Further, since the friction member 11 is arranged on the base member 10 by inserting the friction member 11 into the recess 12, the friction member 11 is inserted into the base member 10 only by driving or pressing the friction member 11 into the recess 12. Since it is possible to attach the friction member 11 to the base member 10 without using an adhesive having an uneasy heat resistance, the friction member 11 can be securely attached to the base member 10.

FIG. 4 shows a driven member 24 according to the second embodiment.
FIG. 5 is a sectional view taken along line S5-S5 in FIG. The driven member 24 includes a base member 25 formed by pressing a sheet metal, and a plurality of friction members 26 arranged in a circle around the rotation center axis N at intervals from the base member 25. As shown in FIG. 5, these friction members 26 are inserted into recesses 27 provided in the base member 25 with the axial direction being the depth direction, and the base member 2 is bonded with an adhesive.
5 is fixed. Each of the friction members 26 is formed in a square front, unlike the friction member 11 of FIG. 3 having a front circular shape, whereby the friction members 26 are obtained from the above-described material using carbon as a main raw material by easy processing. I am trying to be.

In this embodiment, as shown in FIG. 5, the depth of the concave portion 27 is smaller than the thickness of the friction member 26 in the axial direction. For this reason, a part of the axial thickness of the friction member 26 is accommodated in the recess 27, and the position of the V-shaped groove 28 formed in the friction member 26 is such that the entire V-shaped groove 28 protrudes from the surface of the base member 25. It has become a position. For this reason, even if the wedge-shaped projections 9 of the driving member 2 are inserted and pressed into the V-shaped grooves 28, the respective circumferential portions of the wedge-shaped projections 9 between the friction members 26 are not attached to the friction members 26. It does not contact and does not interfere with the base member 25. .

Therefore, in this embodiment, each part of the wedge-shaped projection 9 in the circumferential direction is formed by the friction member 26 by the relative rotation of the wedge-shaped projection 9 of the driving member 2 and the V-shaped groove 28 of the driven member 24. The non-contact portion of the driven member 24, which has become sequentially in contact with the wedge-shaped projection 9 so that the wedge-shaped projection 9 can be cooled, is spaced apart between the friction members 26, and the depth of the concave portion 27 is reduced. Of the groove 1 shown in FIG.
4 need not be formed on the base member 25.

FIG. 6 shows a driven member 34 according to the third embodiment.
7 is a sectional view taken along line S7-S7 in FIG. 6, and FIG. 8 is a sectional view taken along line S8-S8 in FIG. This driven member 34 also
It is composed of a base member 35 formed by pressing a sheet metal, and a plurality of friction members 36 which are arranged in a circle around the rotation center axis N at intervals on the base member 35. As shown in FIG. 7, these friction members 36
Are inserted into the recesses 37 provided in the base member 35 with the axial direction as the depth direction. Also,
8 between the friction members 36 of the base member 35.
As shown in the figure, a groove 39 is formed, and the width of the groove 39 is larger than the width of the V-shaped groove 38 of the friction member 36. For this reason, due to the relative rotation of the wedge-shaped projection 9 of the driving member 2 and the V-shaped groove 38 of the driven member 34, the respective circumferential portions of the wedge-shaped projection 9 do not contact the friction member 36 and are cooled. In this embodiment, the non-contact portion is a groove 39 between the friction members 36.

In this embodiment, as shown in FIG. 7, the length of the concave portion 37 in the same direction is smaller than the length of the friction member 36 in the radial direction about the rotation center axis N. It is getting bigger. For this reason, the friction member 36 is disposed on the base member 35 so as to be movable in the radial direction about the rotation center axis N. Base member 35
Is provided with a bent projection 35A on the outer periphery thereof,
The protrusion 35 </ b> A which is bent after the friction member 36 is inserted into the groove 37 prevents the friction member 36 from coming out of the concave portion 37.

According to this embodiment, since each of the friction members 36 is movable in the radial direction about the rotation center axis N, the driving member 3 having the wedge-shaped projection 9 is provided.
Even if there is a slight misalignment between the rotation center axis of the driven member 34 and the rotation center axis of the driven member 34, the wedge-shaped projection 9 is
These errors are absorbed by the radial movement of the respective friction members 36, and the respective wedge-shaped projections 9 and the V-shaped grooves 38 are formed on the respective outer diameter side taper surfaces. And the inner diameter side taper can be pressed against each other.

FIG. 9 shows a driven member 44 according to the fourth embodiment.
Is shown. The driven member 44 includes a base member 45 and a friction member 46 inserted into a concave portion 47 formed in a circular shape on the base member 45 about the rotation center axis N.
FIG. 10 shows the friction member 46 before insertion into the recess 47,
The friction member 46 has a gap S between both ends 46A and 46B.
The friction member 46 is formed in the shape of a broken ring which is opened and opposed to each other, and in a natural state, has a diameter larger than that of the circular recess 47 and is elastically deformed to reduce its diameter. The friction member 46 which is inserted into the
7 by pressing against the outer diameter side wall.
Is fixed to the base member 45. Of course, the friction member 46 may be fixed to the base member 45 using an adhesive.

The V-shaped groove 48 of the friction member 46 shown in FIG.
A base member 45 for a cutting tool or a grinding tool at a fixed position.
Is formed by rotating about a rotation center axis N, or by rotating a cutting tool or a grinding tool about the rotation center axis N with respect to the fixed base member 45.

According to this embodiment, the friction member 46 is formed in the shape of a broken ring centered on the rotation center axis N.
Since the missing circle portion which is the gap S is provided, the driving member 2
When the relative rotation between the wedge-shaped projection 9 and the V-shaped groove 48 of the driven member 44 occurs, each part of the wedge-shaped projection 9 in the circumferential direction about the rotation center axis N becomes , And does not contact the friction member 46, and is cooled. For this reason, the non-contact portion in this embodiment is a broken circle portion which is the gap S.

FIG. 11 shows a second embodiment of the relationship between the driving member and the receiving member. A friction member 56 is attached to a receiving member 55 that is disposed at a position that sandwiches the driving member 52 having the wedge-shaped projection 9 formed therein and the driven member 4 in the axial direction. The friction member 56 has a planar shape perpendicular to the axial direction, and has a ring shape about the rotation center axis N.

In this embodiment, the rotation is transmitted from the driving member 52 to the driven side by the wedge-shaped projection 9 of the driving member 52.
A driven member 4 having a V-shaped groove 13 for inserting and pressing;
The friction member 56 is formed on both the receiving member 55 and the driving member 52, so that the torque that can be transmitted can be larger than that in the embodiment of FIG.

FIG. 12 shows a third embodiment of the relationship between the driving member and the receiving member. The driving member 62 is connected to the V of the driven member 4.
It has a first wedge-shaped protrusion 9 that is inserted and pressed into the groove 13 and also has a second wedge-shaped protrusion 69 that tapers toward the receiving member 65. The receiving member 65 has the same structure as the driven member 4. That is, the receiving member 65 includes the base member 70 and the concave portion 7 of the base member 70.
2 are arranged. The friction member 71 has a V-shaped groove 73 which has a shape corresponding to the second wedge-shaped projection 69, and into which the wedge-shaped projection 69 is inserted and pressed.
Are formed.

In this embodiment, the transmission of the rotation from the driving member 62 to the driven side is performed by the driven member 4 having the V-shaped groove 13 into which the first wedge-shaped projection 9 of the driving member 622 is inserted and pressed. Since the second wedge-shaped projection 69 of the driving member 62 is formed on both the receiving member 65 having the V-shaped groove 73 to be inserted and pressed against, the frictional force due to the wedge effect is generated in both of them. In addition, the torque that can be transmitted can be increased as compared with the embodiment of FIG.

[0068]

According to the present invention, it is possible to shorten the axial length of the clutch as compared with the multi-plate clutch while securing a large frictional force.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a main part of a clutch according to an embodiment of the present invention.

FIG. 2 is a dynamic diagram showing that a large frictional force is generated by a wedge effect when a wedge-shaped projection presses against a V-shaped groove.

FIG. 3 is a front view showing the whole driven member of FIG. 1;

FIG. 4 is a front view showing a part of a driven member according to a second embodiment.

FIG. 5 is a sectional view taken along line S5-S5 in FIG. 4;

FIG. 6 is a front view showing a part of a driven member according to a third embodiment.

FIG. 7 is a sectional view taken along line S7-S7 of FIG. 6;

FIG. 8 is a sectional view taken along line S8-S8 in FIG. 6;

FIG. 9 is a front view showing the whole driven member according to a fourth embodiment.

FIG. 10 is a perspective view showing a friction member in the shape of a missing ring used in a driven member according to a fourth embodiment.

FIG. 11 is a view similar to FIG. 1 showing a second embodiment of the relationship between the driving member and the receiving member.

FIG. 12 is a view similar to FIG. 1, showing a third embodiment of the relationship between the driving member and the receiving member.

[Explanation of symbols]

 2,52,62 Driving member 4,24,34,44 Driven member 5,55,65 Receiving member 9,69 Wedge-shaped projection 10,25,35,45,70 Base member 11,26,36,46,71 Friction members 12, 27, 37, 47, 72 Recesses 13, 28, 38, 73 V-shaped grooves 14 Non-contact portions of base members 39 Non-contact portions of base members 15 Non-contact portions 15 Friction reducing members Thrust bearing 56 Planar friction member N Rotation center axis S Open gap and non-contact area

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiroshi Ishihara 2-14-8 Matsubara-cho, Akishima-shi, Tokyo Kikuchi Press Industry Co., Ltd. (72) Inventor Susumu Kurosaki 2-14-8 Matsubara-cho, Akishima-shi, Tokyo Kikuchi Inside Press Industry Co., Ltd. (72) Inventor Takao Nakagawa 2-16-27 Nishikicho, Warabi-shi, Saitama Prefecture Inside Akros Co., Ltd. (72) Inventor Yuki 2-16-27 Nishikicho, Warabi-shi, Saitama Prefecture Inside Akros Co., Ltd. 72) Inventor Kazuo Kanazawa 1-7-2 Nishi Shinjuku, Shinjuku-ku, Tokyo F-term in Fuji Heavy Industries Ltd. (reference) 3J056 AA53 AA62 BA02 BE06 BE17 GA02 GA05 GA12 GA14 GA26

Claims (11)

[Claims] A driving member and a driven member having a coaxial rotation center axis are disposed to face each other in the axial direction, and the rotation of the driving member is caused by frictional force caused by pressure contact between the driving member and the driven member. In the clutch transmitted to the driven member,
One of the driving member and the driven member is provided with a wedge-shaped projection that is tapered toward the other, and the other has a shape corresponding to the wedge-shaped projection, A clutch, wherein a V-shaped groove is formed with which the shaped projection presses. 2. The clutch according to claim 1, wherein the other is formed including a base member and at least one friction member disposed on the base member, wherein the friction member has the V-shaped groove. Is provided, and at least a part of the wedge-shaped projection comes into contact with the friction member by relative rotation of the V-shaped groove and the wedge-shaped projection about the rotation center axis. A clutch comprising a non-contact portion that disappears. 3. The clutch according to claim 2, wherein the number of the friction members is plural, and the friction members are arranged on the base member in a circle around the rotation center axis. An interval is provided between the friction members, and the interval is the non-contact portion. 4. The clutch according to claim 3, wherein the plurality of friction members are arranged on the base member so as to be movable in a radial direction about the rotation center axis. . 5. The clutch according to claim 2, wherein the number of the friction members is one, and the friction members are disposed on the base member in a shape of a broken ring centered on the rotation center axis. And the non-circular portion of the non-circular ring shape is the non-contact portion. 6. The clutch according to claim 2, wherein the base member has a recess having an axial direction as a depth direction, and the recess has at least an axial thickness of the friction member. The clutch according to claim 1, wherein the friction member is disposed on the base member by partially inserting the friction member. 7. The clutch according to claim 6, wherein the depth of the concave portion escapes from the V-shaped groove by a relative rotation of the V-shaped groove and the wedge-shaped projection about the rotation center axis. The wedge-shaped projection has a depth that does not interfere with the base member. 8. The clutch according to claim 6, wherein the base member has escaped from the V-shaped groove by a relative rotation of the V-shaped groove and the wedge-shaped protrusion about the rotation center axis. A clutch, wherein a groove is formed into which the wedge-shaped projection enters, and the size of the groove is such that a gap is formed between the wedge-shaped projection and the wedge-shaped projection. 9. A clutch member according to claim 1, wherein said one portion is interposed between said one member and said other member in an axial direction to receive said one member in a direction opposite to said other member. The receiving member is a member on the same side as the other of the driving side and the driven side, and between the one and the receiving member, between the one and the receiving member, A clutch comprising a friction reducing member for reducing rotational friction. 10. The clutch according to claim 1, wherein an axial portion sandwiching the one with the other receives a movement of the one toward the side opposite to the other. The receiving member is a member on the same side as the other of the driving side and the driven side, and at least one of the one and the receiving member is perpendicular to the axial direction. A clutch comprising a friction member having a planar shape. 11. The receiving member according to claim 1, wherein said one of said receiving members is located at an axial position sandwiching said one member together with said other member and receiving said one member moving in a direction opposite to said other member. The receiving member is a member on the same side as the other of the driving side and the driven side, and the one side has a first wedge-shaped projection which is the wedge-shaped projection, A second wedge-shaped projection is provided which projects in a tapered manner toward the member. The receiving member also has a V-shaped projection corresponding to the second wedge-shaped projection and pressed against the second wedge-shaped projection. A clutch formed with a groove.