JP2001355656A - Clutch device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably feed lubricant to contact faces concerning clutch action to control abrasion for a long time in a clutch device. SOLUTION: This clutch device has a cam plate 4 adapted to change between a power transmitting state to rotate synchronously a first rotation axis 2 and a second rotation axis 3 which are coaxial and a power non-transmitting state to be mounted synchronously/rotatably and axially/movably on the second rotation axis and to have a movable contact face 4a and a clutch housing 1 to be power non-transmitting state by being pressed against the movable contact. face and to be the power transmitting state by being separated from the same. A lubricant reservoir 20 to let the lubricant into a gap side of the contact faces is mounted on the clutch housing. The lubricant is fed to the contact faces from the lubricant reservoir for supplying the lubricant to control abrasion on the contact faces.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a clutch device.

[0002] This clutch device is interposed between the power transmissions of two rotating bodies disposed coaxially and opposed to each other, and is capable of rotating both rotating bodies synchronously when rotating power is input to a first rotating body. On the other hand, when rotational power is input to the second rotating body, the second rotating body is brought into a non-rotating state and separated from the first rotating body.

[0003]

2. Description of the Related Art A clutch device includes a clutch housing having a fixed contact surface tapered in the axial direction and a movable contact surface tapered in the same direction as the fixed contact surface. With a cam plate,
There is a clutch housing in which a cam plate is axially displaceable so that a movable contact surface is separated or pressed against a fixed contact surface by a tapered cone shape due to an axial displacement of a cam plate.

In this clutch device, the cam plate is displaced to one side in the axial direction in accordance with the rotation of the first rotating body, and the movable contact surface is separated from the fixed contact surface. The first rotator and the second rotator are coupled to rotate synchronously, and the cam plate is displaced in the other axial direction with respect to the rotation of the second rotator so that the movable contact surface is pressed against the fixed contact surface. Thus, a clutch operation is performed in which the second rotating body is connected to the clutch housing through the power non-transmitting state, that is, the cam plate, via the cam plate, and the second rotating body is in the non-rotating state.

[0005]

In such a clutch device, since the above-mentioned clutch operation by pressure contact and separation is performed by frictional engagement of both contact surfaces, if both contact surfaces are excessively lubricated, This is disadvantageous because the frictional engagement force is reduced. Therefore, conventionally, lubrication for both contact surfaces has not been considered much.

The present inventors have studied and found that the completely non-lubricated contact surface wears over time due to the separation and the press-contact operation, so that the wear is reduced within a range where the frictional engagement force is not reduced. It has been found that it is preferable to lubricate both contact surfaces to some extent to suppress them.

Therefore, in the clutch device of the present inventors, a lubricant for lubricating both contact surfaces is put in a sealed space around both contact surfaces. Since there is a risk of depletion or deterioration due to use, it is necessary to ensure a long-term stable supply of lubricant to both contact surfaces.

Accordingly, the present invention makes it possible to provide a long-term stable supply of a lubricant for lubricating both contact surfaces in a clutch device, thereby suppressing wear on both contact surfaces for a long period of time, while preventing the exhaustion and deterioration of the lubricant. Therefore, it is a common object to make the life of the clutch device longer.

[0009]

SUMMARY OF THE INVENTION The first and second clutch devices of the present invention comprise a power transmission state in which first and second rotating bodies disposed coaxially facing each other are synchronously rotated and a power transmission state in which the first and second rotating bodies are relatively rotated. A clutch device for switching to a transmission state, wherein the fixed friction ring receives lubricant flowing from the inner diameter side by rotational centrifugal force, and a gap between the fixed contact surface and the movable contact surface of the movable friction ring. A lubricant reservoir is provided to allow the lubricant to flow to the side.

According to the first and second aspects of the present invention, the lubricant flows out from the lubricant reservoir toward the gap between the two contact surfaces.
As a result of gradually supplying lubricant to both contact surfaces from the lubricant pool, long-term stable replenishment of lubricant is possible, and long-term suppression of wear on both contact surfaces can be achieved, while preventing depletion and deterioration of the lubricant. And a longer life of the clutch device can be achieved.

In this case, the clutch operation in this clutch device is performed by frictional engagement between the two contact surfaces. Therefore, if the both contact surfaces are excessively lubricated, the frictional engagement force is reduced, which is inconvenient. In the first and second cases, since the lubricant flowing once due to the rotational centrifugal force from the inner diameter side, that is, the rotational centrifugal force of the first rotating body and the second rotating body, is once received in the lubricant reservoir, the two contact surfaces are provided. Can be prevented from being supplied with an excessive amount of lubricant, and the wear can be suppressed by lubricating both contact surfaces within a range where the frictional engagement force is not reduced.

In the case of the second lubricant reservoir of the present invention,
The lubricant, which is arranged at the other axial position from the small diameter side of the fixed contact surface and flows from the inner diameter side, is rotated by the centrifugal force to the outer diameter through the gap between the first rotating body and the axially opposed surface of the movable friction ring. Since the lubricant flows toward the side, the lubricant can flow more smoothly toward the lubricant pool by applying a further rotational centrifugal force. As a result, it is possible to effectively prevent interruption of lubrication on both contact surfaces. Further, it is preferable because abrasion due to rolling of the ball in the cam groove formed on the axially opposed surface of the first rotating body and the movable friction ring in the ball cam mechanism can be suppressed.

In the first and second cases of the present invention, it is preferable that the fixed friction ring has a circulation passage formed on the outer diameter side of the fixed contact surface to communicate the lubricant reservoir with the larger diameter side of the gap. Is provided, and the lubricant from the lubricant reservoir is circulated from the larger diameter side to the smaller diameter side of the gap between the fixed contact surface and the movable contact surface of the movable friction ring through the circulation passage.

In such a case, since the lubricant is repeatedly used for lubricating the contact surface through the circulation passage, the shortage of the lubricant can be more preferably eliminated, and the lubricant is preferably moved from the large diameter side to the small diameter side of the gap. When the first rotating body is rotated and the movable contact surface is separated from the fixed contact surface and the gap is released, the contact surface is gradually removed from the gap while resisting the rotational centrifugal force. It can be circulated for the next lubrication while lubricating toward the smaller diameter side,
When the second rotating body rotates and the movable friction ring presses against the fixed contact surface to close the gap, the lubricant is preferably stored on the larger diameter side of the gap to prepare for the next lubrication.

In the first and second cases of the present invention, preferably, the outer end side of the fixed friction ring that defines the lubricant reservoir is
A non-contact sealing portion is formed facing the outer periphery of the first rotating body via a minute gap.

In such a case, the lubricant in the lubricant reservoir is sealed by the non-contact sealing portion, so that external leakage of the lubricant can be prevented.
It is preferable that the shortage of the lubricant is prevented.

The third clutch device of the present invention is a clutch device for switching between a power transmission state in which first and second rotating bodies disposed coaxially and opposed to each other are synchronously rotated and a power non-transmission state in which the first and second rotating bodies are relatively rotated. The lubricant reservoir is provided on at least one of the movable contact surface of the movable friction ring and the fixed contact surface of the fixed friction ring.

According to the third aspect of the present invention, since the lubricant pool is provided on the contact surface itself, the possibility of shortage of the lubricant on the contact surface is largely eliminated, and the wear on both contact surfaces can be suppressed for a long time. In addition, the depletion and deterioration of the lubricant can be prevented, and the life of the clutch device can be extended.

As described above, the first to third clutch devices of the present invention can solve the above-mentioned common problem.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below based on embodiments shown in the drawings.

A clutch device according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a side sectional view of the clutch device in a power cutoff state, and FIG.
FIG. 3 is a side sectional view of the clutch device in a power transmission state.
4 is an exploded perspective view of the clutch device, FIG. 4 is an enlarged sectional view of a main part of FIG. 1, and FIG. 5A is an enlarged view of a main part of FIG.
FIG. 3B is an enlarged view of a main part of FIG. 2.

In these figures, A indicates the entire clutch device. The clutch device A mainly includes a clutch housing 1, a first rotating shaft 2, a second rotating shaft 3, and a cam plate 4. , A conical spring 5, a rolling bearing 6, and a ball cam mechanism 7.

The clutch housing 1 is, as a fixed friction ring, fixed to a clutch device mounting wall (not shown), and has a tapered cone-shaped fixed contact surface 1a on its inner peripheral surface that expands in one axial direction. It has a cylindrical structure having a bearing mounting surface 1b.

The clutch housing 1 also has a circumferential groove 1c on one inner circumferential surface in the axial direction, and an annular circlip 1d is fitted into the circumferential groove 1c to prevent the rolling bearing 6 from coming off in the axial direction.

The first rotary shaft 2 is a hollow shaft in the axial direction driven to rotate by a power source such as a motor, and has a radially outwardly facing flange 8 integrally formed on one outer peripheral surface in the axial direction.
A small-diameter shaft insertion hole 9 is formed through one end face in the axial direction.

The second rotary shaft 3 has a small-diameter shaft portion 3b on one axial side extending outside the clutch housing, and a small-diameter shaft portion 3a on the other axial side inserted into a shaft fitting hole 9 of the first rotary shaft 2. The circlip 12 is connected to the first rotating shaft 2.

The second rotary shaft 3 has a male spline 13 formed on the outer peripheral surface of a large diameter shaft portion 3c connected to the small diameter shaft portion 3a, and another large diameter shaft portion connected to the large diameter shaft portion 3c. 3d
Is rotatably supported on a bearing mounting surface 1b of the clutch housing 1 via a bearing 6 on the outer peripheral surface.

In this case, the circlip 15 is fixed to the circumferential groove 14 formed on the outer peripheral surface of the large-diameter shaft portion 3d of the second rotating shaft 3, whereby the second rotating shaft 3 and the like come off from the clutch housing 1. Has been prevented.

The cam plate 4 is provided with the clutch housing 1.
As the movable friction ring housed in the clutch housing 1, the outer peripheral surface in the radial direction is a tapered cone-shaped movable contact surface 4a whose diameter increases toward one side in the axial direction. It is radially opposed to the fixed contact surface 1a.

The cam plate 4 also has an inner peripheral surface into which the second rotary shaft 3 is fitted, and a female spline 16 that spline-fits with the male spline 13 of the second rotary shaft 3 on the inner peripheral surface.
And the second rotary shaft 3
And are integrally rotatable, and are displaceable in the axial direction.

The ball cam mechanism 7 includes at least the flange 8, the cam plate 4, the spring 5, and the ball 19 as constituent elements. The flange 8 functions as a fixed cam plate that is immovable in the ball cam mechanism 7 in the axial direction. The cam plate 4 is coaxially opposed to the flange 8 as a movable cam plate in the ball cam mechanism 7 so as to be axially displaceable. Flange 8
And a pair of cam grooves 1 on the opposing surfaces of the
7, 18 are provided separately. Both cam grooves 17,
18 are each formed on a mortar-shaped slope whose depth decreases from the center in the circumferential direction to both sides in the circumferential direction. The spring 5 serves as an urging member for urging the cam plate 4 toward the flange 8. The ball 19 has both cam grooves 17, 1
It is stored so as to be able to roll between eight.

In this embodiment, the clutch housing 1
And a lubricant reservoir 20 for storing a lubricant such as grease.

The lubricant reservoir 20 is a radially inward concave portion located at the other axial position from the small diameter side 1a1 of the fixed contact surface 1a and communicates with a circulation passage 23 described later. , The bottom surface is open.

The lubricant reservoir 20 receives the lubricant flowing to the outer diameter side by the rotational centrifugal force from the gap 21 between the first rotating shaft 2 and the axially opposed surface of the cam plate 4 and the clutch housing. The lubricant is caused to flow out to the gap side between the fixed contact surface 1a and the movable contact surface 4a of the cam plate 4.

In this case, the clutch housing 1
A circulating passage 23 that communicates the lubricant reservoir 20 with the large-diameter side 1a2 of the fixed contact surface 1a is provided on the outer diameter side of the fixed contact surface 1a.

The manufacture of the circulation passage 23 will be described.

With respect to the outer periphery of the clutch housing 1, a through hole 24 is formed in the radial direction from the other side in the axial direction from the small diameter side 1 a 1 of the fixed contact surface 1 a, and from one position in the axial direction from the large diameter side 1 a 2 Is formed. Further, a through hole 26 is formed at the outer end of the clutch housing 1 in the axial direction from the position on the outer diameter side of the fixed contact surface 1a toward the one side in the axial direction through the through hole 24 and reaching the through hole 25.

Then, the lubricant reservoir 21 is constituted by a through-hole portion which is located on the inner diameter side of the through-hole 26 in the through-hole 24 and expands radially inward.

The circulation passage 23 has a through hole portion 23 a located between the lubricant reservoir 20 and the through hole 26 in the through hole 24, and the two through holes 24, 25 in the through hole 26.
The through hole portion 23b and the through hole portion 23c on the inner diameter side of the through hole 26 in the through hole 25 are formed.

The other through-holes in the through-holes 24 to 26 are appropriately closed by a filling member such as a screw 27 to prevent the lubricant from leaking out of the circulation passage 23.

As a result, as shown by the arrow, the lubricant flowing to the outer diameter side by the rotational centrifugal force from the gap 21 between the first rotating shaft 2 and the axially opposed surface of the cam plate 4 is accumulated in the lubricant reservoir 20. And further moves toward the large-diameter side 1a2 of the fixed contact surface 1a through the circulation passage 23.

Then, the first rotary shaft 2 rotates and the cam plate 4 is displaced to one side in the circumferential direction. As a result, the movable contact surface 4a is separated from the fixed contact surface 1a of the clutch housing 1 and both contact surfaces 1a , 4a, the two contact surfaces 1a, 4a are gradually fixed to the fixed contact surface 1a while the lubricant circulating in the circulation passage 23 is resisted from the clearance by the rotational centrifugal force.
While lubricating from the large-diameter side 1a2 to the small-diameter side 1a1, it can be circulated for the next lubrication.

When the second rotating shaft 3 rotates and the movable contact surface 4a of the cam plate 4 is pressed against the fixed contact surface 1a of the clutch housing 1 and the gap between the two contact surfaces 1a, 4a is closed, the circulation passage is formed. The lubricant circulated through the reservoir 23 is stored on the large-diameter side 1a2 of the fixed contact surface 1a and is prepared for the next lubrication.

Therefore, in the present embodiment, the lubricant from the lubricant reservoir 20 is circulated through the circulation passage 23 to move from the large-diameter side 1a2 to the small-diameter side 1a1 of the fixed contact surface 1a. 4a, the lubricant is gradually discharged from the lubricant reservoir 20 into the two contact surfaces 1a, 4a.
And the lubricant can be supplied stably for a long period of time. In addition, while the wear on the contact surfaces 1a and 4a is suppressed for a long time, the lubricant can be prevented from being depleted or deteriorated, and the life of the clutch device can be extended.

In the case of the present embodiment, since the lubricant to be flowed flows to the outer diameter side by the rotational centrifugal force from the gap between the first rotating shaft 2 and the axially opposed surface of the cam plate 4, the ball cam mechanism 7, cam grooves 17 and 18 formed on the axially opposed surfaces of the flange 8 of the first rotating shaft 2 and the cam plate 4.
In this case, wear due to rolling of the ball 19 can be suppressed.

FIG. 5 shows the operation of the clutch device A.
This will be described with reference to FIG. FIG. 5 shows a cam groove 17 in the flange 8 of the first rotating shaft 2 and a cam groove 18 in the cam plate 4.
FIG. 9 is a diagram for describing a cam operation by a ball 19 interposed between the cam grooves 17 and 18.

The cam plate 4 is urged in the other axial direction by a spring 5 and its contact surface 4a is pressed against the contact surface 1a of the clutch housing 1, and the rotation of the second rotating shaft 3 is locked. It is in a non-rotation state. In this state, as shown in FIG. 5A, the ball 19 is located at the axially deepest circumferential center 17a0, 18a of the cam groove 17, 18.
It is located between 0.

In this state, when the first rotating shaft 2 is driven to rotate by a power source such as a motor (not shown), the cam grooves 17 and 18 between the opposed surfaces of the flange 8 and the cam plate 4 are formed in opposite directions. The ball 19 rolls in the circumferential direction between the mortar-shaped slopes 17a2 and 18a2 as shown in FIGS. 5 (a) to 5 (b). In the mortar-shaped slopes 17a2 and 18a2,
As shown in FIGS. 5A and 5B, one mortar-shaped slope 17
a2 is the other in the circumferential direction, and the other mortar-shaped slope 1
8a2 is reduced in depth toward one side in the circumferential direction, so that the cam plate 4 is displaced toward one side in the axial direction from the flange 8 against the spring 5;
Thereby, the contact surface 4 a of the cam plate 4 is separated from the contact surface 1 a of the inner peripheral surface of the clutch housing 1.

Then, as shown in FIG. 5B, the ball 19 is sandwiched in the axial direction between both sides of the mortar-shaped slopes 17a2 and 18a2.

As described above, the ball 19 has the mortar-shaped slope 17.
When the cam plate 4 is sandwiched in the axial direction between the two sides of the first and second a2 and 18a2, the cam plate 4 rotates in the same direction as the rotation of the first rotation shaft 2 in one of the circumferential directions.
The rotating shaft 3 is also rotated in the same direction, so that the rotating power of the first rotating shaft 2 is transmitted.

When the first rotating shaft 2 is driven to rotate in the opposite direction to the above, the ball 19 becomes the mortar-shaped slope 17.
a1 and 18a1, and the mortar-shaped slope 17a
1 and 18a1, the cam plate 4 is axially sandwiched between the two sides, and the cam plate 4 is rotated in the same direction by the other rotational power of the first rotary shaft 2 in the circumferential direction, and the second rotation is performed together with the second rotational power.
The rotating shaft 3 is also rotated in the same direction, so that the rotating power of the first rotating shaft 2 is transmitted. In this way, the rotational power is transmitted in any rotational direction.

The present invention is not limited to the embodiment described above, and various applications and modifications are conceivable.

(1) Another embodiment of the present invention will be described with reference to FIGS.

The clutch device A1 of this embodiment is characterized in that the clutch housing 1 is provided with a lubricant reservoir 20a, similarly to the lubricant reservoir 20 described above. L indicates a lubricant.

The lubricant reservoir 20a is constituted by an annular concave portion provided on the inner peripheral surface of the clutch housing 1 at the other axial position from the small diameter side 1a1 of the fixed contact surface 1a of the clutch housing 1.

Then, the inner diameter surface 1e of the outer end side 1g of the clutch housing 1 defining the lubricant reservoir 20a is
Non-contact sealing in which a tapered cone shape having an enlarged diameter in one axial direction and an outer peripheral surface 8a having a tapered cone shape having an enlarged diameter in one axial direction of the flange 8 of the first rotating shaft 2 are opposed through a small gap. The part 30 is formed.

Therefore, in this embodiment, the same operation and effects as those of the above-described embodiment are obtained, and the lubricant in the lubricant reservoir 20a is sealed by the non-contact sealing portion 30, so that the lubricant can be prevented from leaking to the outside. It is preferable that the shortage of lubricant is prevented.

The inner surface 1e of the outer end 1g of the clutch housing 1 defining the lubricant reservoir 20a and the outer surface 8a of the flange 8 of the first rotating body are not limited to the tapered cone shape. As shown by 8, a non-contact sealing portion 30a facing each other in one axial direction may be used.

(2) Still another embodiment of the present invention will be described with reference to FIGS.

FIG. 9 is a side sectional view of the clutch device of this embodiment in a power non-transmission state, FIG. 10 is an enlarged view of a main part of FIG. 9, and FIG. 11 is a perspective view of a main part of FIG.

In the clutch device A2 of this embodiment, a lubricant reservoir 20b is provided on the movable contact surface 4a of the cam plate 4.

The lubricant reservoir 20b is formed on the movable contact surface 4
a is formed of a plurality of axial grooves having a shape capable of storing lubricant at equal intervals in the circumferential direction.

Thus, since the lubricant reservoir 20b is provided on the movable contact surface 4a itself, both the contact surfaces 1a are provided.
The danger of running out of the lubricant on the a and 4a is largely eliminated, and the wear on the contact surfaces 1a and 4a is suppressed for a long time, while the lubricant is prevented from being depleted or deteriorated, and the life of the clutch device is extended. Can be achieved.

The form of the lubricant pool is as follows.
As shown in FIG. 12, a form of a lubricant reservoir 20c composed of a plurality of circumferential grooves on the movable contact surface 4a may be used.

The form of the lubricant pool is as follows.
As shown in FIG. 13, a lubricant reservoir 20d may be formed on the fixed contact surface 1a of the clutch housing 1 by a plurality of circumferentially equally spaced axial grooves, or as shown in FIG. May be used as the lubricant reservoir 20e formed of the peripheral groove.

In any of the forms of the lubricant reservoirs 20c to 20e, the same function and effect as described above can be exhibited.

[0067]

As described above, according to the present invention, the fixed friction ring receives the lubricant flowing from the inner diameter side by the rotational centrifugal force, and the fixed contact surface and the movable contact surface of the movable friction ring. A lubricant reservoir is provided to allow lubricant to flow out into the gap between the two surfaces, so that lubricant can flow out from the lubricant reservoir to the clearance between the two contact surfaces and be supplied to both contact surfaces. , While preventing the depletion or deterioration of the lubricant, and extending the life of the clutch device.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a clutch device in a power non-transmission state according to an embodiment of the present invention.

FIG. 2 is a side sectional view of the clutch device in a power transmission state according to the embodiment of the present invention.

FIG. 3 is an exploded perspective view of the clutch device of FIG. 1;

FIG. 4 is an enlarged view of a main part of FIG. 1;

5A is an enlarged view of a main part of FIG. 1, and FIG. 5B is an enlarged view of a main part of FIG.

FIG. 6 is a side sectional view of a clutch device in a power non-transmission state according to another embodiment of the present invention.

FIG. 7 is an enlarged view of a main part of FIG. 6;

FIG. 8 is an enlarged view of a modification of the main part of FIG. 6;

FIG. 9 is a side sectional view of a clutch device in a power non-transmission state according to still another embodiment of the present invention.

FIG. 10 is an enlarged view of a main part of FIG. 9;

FIG. 11 is a perspective view of the cam plate of FIG. 9;

FIG. 12 is a perspective view showing a modification of the cam plate of FIG. 9;

FIG. 13 is a perspective view showing a modification of the clutch housing of FIG. 9;

FIG. 14 is a perspective view showing another modification of the clutch housing of FIG. 9;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Clutch housing 2 1st rotating shaft 3 2nd rotating shaft 4 Cam plate 5 Spring spring 7 Ball cam mechanism 8 Flange of 1st rotating shaft 1a Fixed contact surface of clutch housing 4a Movable contact surface of cam plate 20 Lubricant pool

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3J056 AA33 AA38 AA53 AA62 BA02 BC02 BE21 CA04 CA12 CC13 3J068 AA02 AA07 BA02 BB07 CB03 EE05 EE12 GA05 GA07

Claims (5)

[Claims] 1. A clutch device for switching between a power transmission state in which first and second rotating bodies disposed coaxially facing each other are synchronously rotated and a power non-transmission state in which said first and second rotating bodies are relatively rotated, wherein one of the rotations is performed. A movable friction ring attached to the body so as to be synchronously rotatable and axially displaceable and having a tapered cone-shaped movable contact surface toward one of the axial directions; and a movable contact surface formed by the axial displacement of the movable friction ring. And a fixed friction ring having a tapered cone-shaped fixed contact surface in one axial direction, which is pressed into contact with the power non-transmission state and is separated from the power transmission state. The body has a lubricant reservoir that receives lubricant flowing from the inner diameter side by rotational centrifugal force and allows the lubricant to flow out to the gap side between the fixed contact surface and the movable contact surface of the movable friction ring. hand A clutch device. 2. A clutch device for switching between a power transmitting state in which first and second rotating bodies arranged coaxially and opposed to each other are synchronously rotated and a power non-transmitting state in which the first and second rotating bodies are relatively rotated, the second rotating body being provided. A movable friction ring attached synchronously rotatable and axially displaceable with respect to and having a tapered cone-shaped movable contact surface; and the movable friction surface is pressed against the movable contact surface by axial displacement of the movable friction ring. A fixed friction ring having a tapered cone-shaped fixed contact surface in a power non-transmission state and separated from the power transmission state; and a cam groove formed in an axially opposed surface of the first rotating body and the movable friction ring. And a ball rotatably interposed between the two cam grooves, and when the rotational power is input to the first rotating body, the movable friction ring is moved in one axial direction to the second rotating body. When rotational power is input to the shaft A ball cam mechanism in which the balls in the two cam grooves roll to displace in the other direction, and the movable contact surfaces thereof are separated from and press-contacted to the fixed contact surface of the fixed friction ring, respectively. The lubricant that is disposed at the other axial position from the small diameter side of the fixed contact surface and flows to the outer diameter side by the rotational centrifugal force from the gap between the axially opposed surfaces of the first rotating body and the movable friction ring. A clutch for receiving the lubricant and allowing the lubricant to flow out to a gap between the fixed contact surface and the movable contact surface of the movable friction ring. 3. The clutch device according to claim 1, wherein a circulating passage formed outside the fixed contact surface of the fixed friction ring so as to communicate with the lubricant reservoir and the large-diameter side of the gap. The lubricant from the lubricant reservoir is circulated from the larger diameter side to the smaller diameter side of the gap between the fixed contact surface and the movable contact surface of the movable friction ring through the circulation passage. Characteristic clutch device. 4. The clutch device according to claim 1, wherein an outer end side of the fixed friction ring that defines the lubricant reservoir is a first friction ring.
A clutch device, wherein a non-contact sealing portion opposing an outer periphery of a rotating body via a minute gap is formed. 5. A clutch device for switching between a power transmission state for synchronously rotating first and second rotating bodies disposed coaxially facing each other and a power non-transmission state for relative rotation. A movable friction ring attached to the body so as to be synchronously rotatable and axially displaceable and having a tapered cone-shaped movable contact surface in the axial direction; and a movable friction surface formed by axial displacement of the movable friction ring. And a fixed friction ring having a tapered cone-shaped fixed contact surface which is pressed into contact with the power non-transmission state, and is spaced apart from the power transmission state, and at least one of a movable contact surface and a fixed contact surface. A clutch device, wherein a lubricant reservoir is provided on a contact surface.