JP2020180649A - Lubrication structure of clutch device - Google Patents

Abstract

To supply a lubrication oil to a plate member effectively.SOLUTION: A lubrication structure of a clutch device 10 includes: a drum member 20 having a drum part 21; a hub member 30 having a cylindrical hub part 31 disposed at the radial inner side relative to the drum part 21; a first plate member 51 provided at an inner periphery of the drum part 21; a second plate member 52 which is provided at an outer periphery of the hub part 31 and may frictionally engage with the first plate member 51; an oil hole 36 which penetrates through the hub part 31 in a radial direction and supplies a lubrication oil to the first plate member 51 and the second plate member 52; and a guide member which protrudes to the radial inner side from an inner periphery of the hub part 31, is provided located at the opposite side of a rotation direction of the hub member 30 with respect to an opening of the oil hole 36, and guides the lubrication oil discharged to the inner periphery of the hub part 31 to the opening of the oil hole 36.SELECTED DRAWING: Figure 3

Description

The present disclosure relates to a lubrication structure of a clutch device, and more particularly to a lubrication structure of a wet multi-plate clutch device.

In the power transmission device of a vehicle, a wet multi-plate clutch device that connects and disconnects the power transmission from the driving force source to the transmission may be used. As a lubrication structure for this type of wet multi-plate clutch device, for example, in Patent Document 1, lubricating oil is discharged from an oil passage on the shaft side toward a cylindrical portion of a clutch hub, and the lubricating oil penetrates the cylindrical portion. A lubrication structure is disclosed in which a friction plate or a separate plate (hereinafter, these are also simply referred to as plate members) is supplied through a plurality of formed oil holes.

Japanese Unexamined Patent Publication No. 2017-161048

By the way, centrifugal force due to the rotation of the clutch hub acts on the lubricating oil discharged from the oil passage on the shaft side toward the cylindrical portion of the clutch hub. For this reason, the lubricating oil cannot be effectively introduced into each oil hole, and the amount of lubricating oil of each plate member may be insufficient, or the amount of lubricating oil supplied to each plate member may be biased. This may cause a local temperature rise of the plate member, uneven wear of the friction material, and the like. Further, the lubricating oil that has not been introduced into each oil hole may collide with the inner peripheral unevenness of the clutch hub, which may cause an increase in stirring resistance and generation of air bubbles in the lubricating oil.

An object of the present disclosure is to provide a lubricating structure capable of effectively supplying lubricating oil to a plate member of a clutch device.

The technique of the present disclosure is provided on a drum member having a cylindrical drum portion, a hub member having a cylindrical hub portion arranged radially inside the drum portion, and an inner circumference of the drum portion. A lubrication structure for a clutch device including one plate member and a second plate member provided on the outer periphery of the hub portion and capable of frictionally engaging with the first plate member, wherein the hub portion is radially oriented. An oil hole that penetrates and supplies lubricating oil to the first plate member and the second plate member, and a hub member that protrudes radially inward from the inner circumference of the hub portion and with respect to the opening of the oil hole. It is provided at a position opposite to the direction of rotation of the above, and is characterized by including a guide member for guiding the lubricating oil discharged toward the inner circumference of the hub portion to the opening of the oil hole.

Further, the hub portion has a recess that is recessed inward in the radial direction, and the oil hole is formed in the bottom portion of the recess, and the guide member is included in the opening edge of the oil hole in the rotation direction. It is preferable that the opening edge is provided on the opposite side of the opening.

Further, it is preferable that the guide member has a protruding portion that protrudes inward in the radial direction from the inner circumference of the hub portion, and a bent portion that bends in the rotational direction from the protruding end of the protruding portion.

Further, the hub portion has a convex portion protruding outward in the radial direction, the oil hole is formed at the tip end portion of the convex portion, and the guide member is among the base end portions of the convex portion. It is preferable that the tip portion projects radially inward in the radial direction from the base end portion on the side opposite to the rotation direction.

Further, the hub member includes an annular side wall portion extending radially inward from the end portion of the hub portion and a cylindrical boss portion extending axially from the side wall portion and facing the inner circumference of the hub portion. , The axial end of the boss portion is cut out in the radial direction, or the through hole is formed through the boss portion in the radial direction, and the lubricating oil supplied from the inside in the radial direction is circulated in the radial direction. It is preferable to have an oil flow passage for discharging from the outer end toward the oil hole.

Further, it is preferable that the flow path axis of the oil flow passage is provided so as to be inclined at a predetermined angle with respect to the radial direction of the hub member.

According to the technique of the present disclosure, lubricating oil can be effectively supplied to the plate member of the clutch device.

It is a schematic cross-sectional view which shows the clutch device which concerns on this embodiment. It is a schematic view which shows the clutch hub which concerns on 1st Embodiment, (A) is a view seen from the radial direction, (B) is a view seen from the axial direction. It is a schematic radial sectional view which shows the main part of the clutch hub which concerns on 1st Embodiment. It is a schematic radial sectional view which shows the main part of the clutch hub which concerns on 2nd Embodiment. It is a schematic radial sectional view which shows the main part of the clutch hub which concerns on 3rd Embodiment. It is a schematic radial sectional view which shows the main part of the clutch hub which concerns on another embodiment. It is a schematic radial sectional view which shows the main part of the clutch hub which concerns on another embodiment.

Hereinafter, the lubrication structure of the clutch device according to the present embodiment will be described with reference to the accompanying drawings. The same parts have the same reference numerals, and their names and functions are also the same. Therefore, detailed explanations about them will not be repeated.

[overall structure]
FIG. 1 is a schematic cross-sectional view showing the clutch device 10 according to the present embodiment. The clutch device 10 is provided between, for example, an output shaft 1 of a driving force source such as an engine and an input shaft 2 of a transmission or the like, and connects and disconnects power transmission from the output shaft 1 to the input shaft 2. In the following description, the axial directions of the output shaft 1 and the input shaft 2 are simply referred to as "axial directions", and the radial direction is simply referred to as "diameter direction".

As shown in FIG. 1, the clutch device 10 includes a clutch drum (drum member) 20, a clutch hub (hub member) 30 arranged radially inside the clutch drum 20, and a plurality of clutch devices 10 fitted to the clutch drum 20. Moved by the hydraulic pressure supplied to the hydraulic chamber 40, the separate plate 51 (first plate member), the end plate 53, the plurality of friction plates 52 (second plate member) fitted to the clutch hub 30. A piston 41 that presses and engages the plates 51 and 52 by friction, a cancel plate 45 that defines the cancel oil chamber 42, and a return spring that urges the piston 41 in a direction away from the plates 51 and 52. It is equipped with 44.

The clutch drum 20 has a cylindrical drum cylinder portion 21 (drum portion) and an annular drum side wall portion 22 extending radially inward from one end (left end in the drawing) of the drum cylinder portion 21. A spline groove portion 24 having a plurality of irregularities is formed on the inner peripheral portion of the drum cylinder portion 21. The unevenness of the spline groove portion 24 is not limited to a plurality, and at least a pair of irregularities may be provided. The inner peripheral portion of the drum side wall portion 22 is integrally rotatably fixed to the outer periphery of the output shaft 1 by spline fitting or the like.

The clutch hub 30 is an annular hub side wall portion extending inward in the radial direction from a cylindrical hub cylinder portion 31 (hub portion) and one end (right end in the drawing) of the hub cylinder portion 31 opposite to the clutch drum 20. It has a 32 (side wall portion) and a cylindrical boss portion 35 that projects axially from the side surface of the hub side wall portion 32 on the clutch drum 20 side and partially faces the inner peripheral surface of the hub cylinder portion 31. A spline groove 34 having a plurality of irregularities is formed on the outer peripheral portion of the hub cylinder portion 31. The unevenness of the spline groove 34 is not limited to a plurality, and at least a pair of irregularities may be provided.

A plurality of oil holes 36 for supplying lubricating oil to the plates 51 and 52 are formed through the hub cylinder portion 31 in the radial direction. Further, a plurality of guide members 38 protruding inward in the radial direction from the opening edge of the oil hole 36 are provided on the inner circumference of the hub cylinder portion 31. Details of the guide member 38 will be described later.

The inner peripheral portion of the hub side wall portion 32 is integrally rotatably fixed to the outer periphery of the input shaft 2 by spline fitting or the like. A thrust bearing 48 (an example of a bearing) is provided between the boss portion 35 and the cancel plate 45.

The separate plate 51 and the friction plate 52 are arranged alternately with each other. The separate plate 51 is an annular plate member having flat surfaces formed on both sides, and is spline-fitted into the spline groove portion 24 of the drum cylinder portion 21 so as to be movable in the axial direction and integrally rotatable in the circumferential direction. The end plate 53 is immovably held at the end (right end in the drawing) of the spline groove 24 by a snap ring (not shown) or the like. The friction plate 52 is an annular plate member to which a friction material (not shown) is attached on both sides, and is spline-fitted into a spline groove 34 of a hub cylinder 31 so as to be movable in the axial direction and integrally rotatable in the circumferential direction. It fits.

The separate plate 51 and the friction plate 52 may be arranged by replacing the friction plate 52 on the clutch drum 20 side and the separate plate 51 on the clutch hub 30 side.

The cancel plate 45 is formed in an annular shape having a diameter smaller than that of the hub cylinder portion 31, and is supported by an output shaft 1 between the drum side wall portion 22 and the hub side wall portion 32. The piston 41 is movably supported by the output shaft 1 on the drum side wall portion 22 side (left side in the drawing) of the cancel plate 45 in the axial direction. A hydraulic chamber 40 is partitioned between the drum side wall portion 22 and the piston 41, and a cancel oil chamber 42 is partitioned between the piston 41 and the cancel plate 45. In the cancel oil chamber 42, a return spring 44 interposed between the piston 41 and the cancel plate 45 in a compressed state is provided. The return spring 44 is not limited to the coil spring shown in the illustrated example, and may be a leaf spring or the like.

An oil supply circuit 70 is connected to the hydraulic chamber 40 via a first oil supply path 61 formed on the output shaft 1. An oil supply circuit 70 is connected to the cancel oil chamber 42 via a second oil supply path 62 formed on the output shaft 1. An oil supply circuit 70 is connected to the space 46 between the cancel plate 45 and the hub side wall portion 32 of the clutch hub 30 via a third oil supply path 63 formed on the output shaft 1.

The oil supply circuit 70 includes an oil pan 71 for storing lubricating oil, an oil strainer 72 immersed in the lubricating oil in the oil pan 71, an oil supply line 73 connected to the oil strainer 72, and an oil supply line 73. It includes an provided oil pump OP and a valve 74 for switching supply / stop of lubricating oil.

When the lubricating oil is supplied from the oil supply line 73 to the hydraulic chamber 40 via the first oil supply passage 61 by turning on the valve 74, the hydraulic pressure in the hydraulic chamber 40 rises. When the hydraulic pressure in the hydraulic chamber 40 rises, the piston 41 strokes in the axial direction toward the plates 51 and 52, and presses the plates 51 and 52 to frictionally engage with each other, thereby causing the clutch device. Reference numeral 10 denotes a contact state in which power is transmitted from the output shaft 1 to the input shaft 2.

On the other hand, when the supply of the lubricating oil to the hydraulic chamber 40 via the first oil supply passage 61 is stopped by turning off the valve 74, the hydraulic pressure in the hydraulic chamber 40 drops. When the hydraulic pressure in the hydraulic chamber 40 drops, the piston 41 moves in a direction away from the plates 51 and 52 due to the urging force of the return spring 44, thereby releasing the frictional engagement of the plates 51 and 52. The clutch device 10 is in a disconnected state in which power transmission from the output shaft 1 to the input shaft 2 is cut off.

In the present embodiment, the lubricating oil supplied from the third oil supply path 63 to the space 46 is introduced into an oil groove 37 (oil flow passage) formed by cutting out the axial end of the boss portion 35 in the radial direction. Further, the lubricating oil introduced into the oil groove 37 is discharged toward the inner circumference of the hub cylinder portion 31. The lubricating oil discharged toward the inner circumference of the hub cylinder portion 31 is guided to the oil hole 36 by the guide member 38, and is supplied between the plates 51 and 52 through the oil hole 36. Hereinafter, the details of the lubrication structure according to the present embodiment will be described.

[First Embodiment]
2A and 2B are schematic views showing a clutch hub 30 according to the first embodiment, FIG. 2A is a view seen from the radial direction, and FIG. 2B is a view seen from the axial direction. FIG. 3 is a schematic radial sectional view showing a main part of the clutch hub 30 according to the first embodiment.

As shown in FIG. 2A, a plurality of oil holes 36 for introducing lubricating oil are formed through the hub cylinder portion 31 of the clutch hub 30 in the plates 51 and 52 (see FIG. 1). Specifically, each oil hole 36 is formed through the bottom portion 34B of the recess 34A that is recessed inward in the radial direction of the spline groove portion 34. In the illustrated example, three oil holes 36 are provided for each recess 34A, but the number and position of the oil holes 36 are not limited to this, and the number and positions of the oil holes 36 are the plates 51 and 52 (see FIG. 1). It may be set appropriately according to the number of sheets and the like.

As shown in FIG. 2B, the hub cylinder portion 31 of the clutch hub 30 has a concave portion 34A recessed inward in the radial direction of the spline groove portion 34 and a convex portion 34C protruding outward in the radial direction in the axial view. It is formed in the form of substantially corrugated serrations arranged alternately in the circumferential direction. That is, both the inner peripheral surface and the outer peripheral surface of the hub cylinder portion 31 have a wave shape in which irregularities are alternately repeated in the circumferential direction.

A plurality of boss portions 35 protruding from the hub side wall portion 32 of the clutch hub 30 are formed by cutting out axially end portions (portions in contact with the thrust bearing 48 shown in FIG. 1) of the boss portion 35 in the radial direction. The oil groove 37 is provided. The oil groove 37 may be formed as a through hole that penetrates the boss portion 35 in the radial direction, but if the groove shape is such that the end portion of the boss portion 35 is cut out, the processing can be easily performed.

The oil grooves 37 are preferably provided at equal pitches in the circumferential direction of the boss portion 35 so that the rotational balance of the clutch hub 30 can be maintained. Each oil groove 37 is provided so that its radial outer end faces the inner peripheral surface of the bottom portion 34B of the recess 34A and opens.

More specifically, as shown in FIG. 3, in the axial view of the clutch hub 30, the oil groove 37 is provided so that the center of the flow path thereof substantially coincides with the center of the hole of the oil hole 36. The groove width W1 (flow path width) of the oil groove 37 is formed to be narrower than the circumferential width W2 of the recess 34A (or the bottom portion 34B). Further, the oil grooves 37 are preferably provided so as to correspond to every other oil groove 37 in the circumferential direction with respect to the bottom portion 34B of the recess 34A. That is, by providing every other oil groove 37 in the circumferential direction with respect to the bottom portion 34B of the recess 34A, the processing man-hours can be effectively reduced as compared with the case where the oil groove 37 is provided corresponding to all the recesses 34A. It has become like.

The hub cylinder portion 31 of the clutch hub 30 is provided with a substantially plate-shaped guide member 38 that projects radially inward from the bottom portion 34B of the recess 34A of the spline groove portion 34. The guide member 38 preferably has a clutch hub because a portion of the bottom portion 34B corresponding to the oil hole 36 is bent inward in the radial direction when the oil hole 36 is formed in the bottom portion 34B of the recess 34A by press working or the like. It is integrally formed with 30. In this way, by using the portion corresponding to the oil hole 36 of the clutch hub 30 generated by press working, the processing cost can be reduced.

In the present embodiment, the guide member 38 is provided on the opening edge of the oil hole 36 on the side opposite to the rotation direction R of the clutch hub 30. That is, of the lubricating oil X1 discharged obliquely in the radial direction from the oil groove 37 toward the bottom 34B of the recess 34A by the centrifugal force accompanying the rotation of the clutch hub 30, some of the lubricating oils X2 have a diameter. It is applied to the guide member 38-1 of the oil hole 36-1 displaced by one from the oil hole 36-0 corresponding to the direction to the side opposite to the rotation direction R, and the guide member 38-1 positively hits the oil hole 36-1. Will be introduced. Further, the lubricating oil X3 that did not hit the guide member 38-1 is applied to the guide member 38-2 of the oil hole 36-2 that is further displaced by one on the side opposite to the rotation direction R, and is applied by the guide member 38-2. It will be actively introduced into the oil hole 36-2.

As a result, the amount of lubricating oil for each oil hole 36 is effectively secured, and the lubricating oil is supplied to each oil hole 36 substantially evenly, between the plates 51 and 52 (see FIG. 1). It is possible to effectively suppress a local temperature rise caused by an insufficient amount of lubricating oil or an uneven amount of lubricating oil, and further, uneven wear of the friction material of the friction plate 52. Further, it is possible to reduce the lubricating oil that collides with the inner circumferences of the concave portion 34A and the convex portion 34C of the spline groove portion 34 without being introduced into each oil hole 36, and the stirring resistance is increased and bubbles are generated in the lubricating oil. Can also be effectively suppressed.

[Second Embodiment]
FIG. 4 is a schematic radial sectional view showing a main part of the clutch hub 30 according to the second embodiment.

As shown in FIG. 4, the lubricating structure of the second embodiment is configured so that the guide member 38 functions as an oil catcher capable of collecting lubricating oil by bending and forming the guide member 38 of the first embodiment. It was done.

Specifically, the guide member 38 of the second embodiment has a substantially plate-shaped protruding portion 38A protruding inward in the radial direction from the bottom 34B of the recess 34A of the spline groove portion 34, and a radial inner end (protruding) of the protruding portion 38A. A bent portion 38B that bends at a predetermined angle is provided on the R side of the clutch hub 30 in the rotation direction from the end). The bent portion 38B is one aspect of the bent portion of the present disclosure, and may have another shape as long as it has a predetermined angle with respect to the protruding portion 38A. By bending the entire guide member 38 into a substantially L shape in this way, the lubricating oil discharged from the oil groove 37 is collected by flowing from the bent portion 38B along the protruding portion 38A, and is collected by the oil hole. You will be surely guided to 36.

That is, of the lubricating oil X1 obliquely discharged from the oil groove 37 due to the centrifugal force accompanying the rotation of the clutch hub 30, some of the lubricating oil X2 is displaced by one in the direction opposite to the rotation direction R. Lubricating oil X3, which was collected in 1 and surely introduced into the oil hole 36-1 and was not collected in the guide member 38-1, is further displaced by one in the direction opposite to the rotation direction R, 38-2. It is configured to be collected in the oil hole 36-2 and surely introduced into the oil hole 36-2.

As a result, as in the first embodiment, the amount of lubricating oil for each oil hole 36 is effectively secured, and the lubricating oil is supplied to each oil hole 36 substantially evenly, and each plate 51, It is possible to effectively suppress the local temperature rise caused by the insufficient amount of lubricating oil between 52 (see FIG. 1) and the uneven amount of lubricating oil, and further the uneven wear of the friction material of the friction plate 52. Further, it is possible to reduce the lubricating oil that collides with the inner circumferences of the concave portion 34A and the convex portion 34C of the spline groove portion 34 without being introduced into each oil hole 36, and the stirring resistance is increased and bubbles are generated in the lubricating oil. Can also be effectively suppressed.

[Third Embodiment]
FIG. 5 is a schematic radial sectional view showing a main part of the clutch hub 30 according to the third embodiment.

As shown in FIG. 5, in the lubrication structure of the third embodiment, each oil hole 36 is formed through the tip portion 34D of the convex portion 34C protruding outward in the radial direction of each spline groove portion 34, and each oil groove 37 is formed. It is provided corresponding to all the convex portions 34C. Specifically, each oil groove 37 is provided so that its radial outer end faces the inner peripheral surface of the tip portions 34D of all the convex portions 34C.

In the axial view of the clutch hub 30, each oil groove 37 is provided so that its flow path axis coincides with the hole axis of each oil hole 36. Further, the groove width W1 of the oil groove 37 is preferably formed to be narrower than the circumferential width W2 of the convex portion 34C (or the tip portion 34D).

The substantially flat plate-shaped guide member 38 is provided in the radial direction from the base end portion 34E on the side opposite to the rotation direction R with respect to the tip end portion 34D among the base end portions 34E and 34F of the convex portion 34C toward the rotation direction R. It is provided so as to project diagonally inward. A predetermined gap for flowing lubricating oil is secured between the radial inner end (protruding end) of the guide member 38 and the base end portion 34F on the rotation direction R side with respect to the tip portion 34D, and is convex. A space S in which lubricating oil can be collected is formed by the inner circumference of the portion 34C and the guide member 38.

That is, the lubricating oil X1 obliquely discharged from the oil groove 37 due to the centrifugal force accompanying the rotation of the clutch hub 30 is displaced by one in the direction opposite to the rotation direction R, and is the base end portion of the guide member 38-1 and the convex portion 34C. It is configured to flow through the gap with 34E, be collected in the space S, and be surely introduced into the corresponding oil hole 36-1.

As a result, as in the first and second embodiments, the amount of lubricating oil for each oil hole 36 is effectively secured, and the lubricating oil is supplied to each oil hole 36 substantially evenly. It is possible to effectively suppress the local temperature rise caused by the insufficient amount of lubricating oil between the plates 51 and 52 (see FIG. 1) and the uneven amount of lubricating oil, and the uneven wear of the friction material of the friction plate 52. become. Further, it is possible to reduce the lubricating oil that collides with the inner circumferences of the concave portion 34A and the convex portion 34C of the spline groove portion 34 without being introduced into each oil hole 36, and the stirring resistance is increased and bubbles are generated in the lubricating oil. Can also be effectively suppressed.

[Other]
It should be noted that the present disclosure is not limited to each of the above-described embodiments, and can be appropriately modified and implemented without departing from the spirit of the present disclosure.

For example, as shown in FIG. 6, in the first embodiment, the flow path axis of the oil groove 37 is at a predetermined angle with respect to the radial direction of the clutch hub 30 in the direction opposite to the rotation direction R of the clutch hub 30. It may be provided so as to be inclined with. Similarly, although not shown, in the second and third embodiments as well, the flow path axis of the oil groove 37 may be provided so as to be inclined at a predetermined angle with respect to the radial direction of the clutch hub 30. .. By inclining the flow path axis of the oil groove 37 in this way, it is possible to more effectively discharge the lubricating oil from the oil groove 37 toward the oil hole 36 by the centrifugal force accompanying the rotation of the clutch hub 30. become.

Further, the clutch device 10 is not limited to the single clutch device of the illustrated example, and may be a dual clutch device.

Further, the clutch device 10 is not limited to the wet multi-plate clutch device, and may be a wet single-plate clutch device.

10 Clutch device 20 Clutch drum (drum member)
21 Drum cylinder (drum)
22 Drum side wall 24 Spline groove 30 Clutch hub (hub member)
31 Hub tube (hub)
32 Hub side wall (side wall)
34 Spline groove 34A Recess 34B Bottom 34C Convex 34D Tip 34F, 34E Base end 35 Boss 36 Oil hole 37 Oil groove (oil flow path)
38 Guide member 38A Protruding part 38B Bending part (bending part)
40 Hydraulic chamber 41 Piston 42 Cancel oil chamber 44 Return spring 45 Cancel plate 46 Space 48 Thrust bearing 51 Separate plate (first plate member)
52 Friction plate (second plate member)

Claims (6)

A drum member having a cylindrical drum portion and
A hub member having a cylindrical hub portion arranged radially inside the drum portion, and
A first plate member provided on the inner circumference of the drum portion and
A lubrication structure for a clutch device provided on the outer periphery of the hub portion and including a second plate member that is frictionally engaged with the first plate member.
An oil hole that penetrates the hub portion in the radial direction and supplies lubricating oil to the first plate member and the second plate member.
It projects radially inward from the inner circumference of the hub portion and is provided at a position opposite to the rotation direction of the hub member with respect to the opening of the oil hole, and is directed toward the inner circumference of the hub portion. A lubrication structure for a clutch device, comprising: a guide member for guiding the lubricating oil discharged to the opening of the oil hole. The hub portion has a recess that is recessed inward in the radial direction, the oil hole is formed at the bottom of the recess, and the guide member is the opening edge of the oil hole in the rotation direction. The lubrication structure for a clutch device according to claim 1, which is provided on the opening edge on the opposite side. The clutch according to claim 1 or 2, wherein the guide member has a protruding portion that protrudes radially inward from the inner circumference of the hub portion, and a bent portion that bends from the protruding end of the protruding portion to the rotational direction side. Lubrication structure of the device. The hub portion has a convex portion protruding outward in the radial direction, and the oil hole is formed at the tip end portion of the convex portion, and the guide member is the base end portion of the convex portion. The lubrication structure for a clutch device according to claim 1, wherein the clutch device projects obliquely inward in the radial direction from the base end portion on the side opposite to the rotational direction with respect to the tip end portion in the rotational direction. The hub member
An annular side wall extending radially inward from the end of the hub, and
A cylindrical boss portion extending axially from the side wall portion and facing the inner circumference of the hub portion,
It is formed by a groove cut out in the axial direction at the axial end of the boss portion or a through hole penetrating the boss portion in the radial direction, and the lubricating oil supplied from the inside in the radial direction is circulated to flow out in the radial direction. The lubrication structure for a clutch device according to any one of claims 1 to 4, further comprising an oil flow passage for discharging oil from an end toward the oil hole. The lubrication structure for a clutch device according to any one of claims 1 to 5, wherein the flow path axis of the oil flow passage is provided so as to be inclined at a predetermined angle with respect to the radial direction of the hub member.

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