JP5046299B2 - Clutch device - Google Patents

Description

  The present invention relates to a clutch device including two friction engagement means that operate separately.

  Conventionally, a clutch device for connecting and releasing a plurality of rotating elements formed by planetary gears or the like in an automatic transmission for a vehicle is known (see Patent Document 1).

  In the clutch device found in Patent Document 1, first friction engagement means and second friction engagement means are disposed along the axis on the inner surface side of a cylindrical connecting drum concentric with a rotation shaft. A first connecting member and a second connecting member are positioned inward of the connecting drum, and the connecting drum is connected to the first connecting member by the first friction engaging means, and is connected to the first connecting member by the second friction engaging means. 2 connected to the connecting member.

  That is, the first friction engagement means presses the plurality of friction plates slidably supported by the connection drum to the plurality of engagement plates supported by the first connection member and positioned between the friction plates. The connecting drum and the first connecting member are connected by frictional engagement. The friction plate of the first friction engagement means is pressed in the direction of pressure contact with the engagement plate by the first piston of the first hydraulic cylinder supported by the rotating shaft. At this time, the friction plate supported by the connecting drum is stopped by a stopper fixed to the connecting drum on the opposite side of the pressing direction by the first piston, and the friction plate and the engaging plate are interposed between the first piston and the stopper. Is pinched.

  Similarly, the second frictional engagement means frictionally engages the friction plate supported by the second connecting member by pressing the friction plates slidably supported by the connection drum to the connection drum. The second connecting member is connected. Then, the friction plate supported by the connecting drum is caused by the friction plate of the second friction engagement means being pressed by the second piston of the second hydraulic cylinder supported by the rotating shaft in the direction of pressure contact with the engagement plate. The stopper is stopped by the stopper on the opposite side of the pressing direction by the second piston, and the friction plate and the engagement plate are pinched between the second piston and the stopper.

  The first hydraulic cylinder includes a first cylinder tube that constitutes a hydraulic chamber that moves the first piston. In the first cylinder tube, a side wall facing the first piston is fixed to the rotation shaft, and the movement of the first piston is guided by a cylindrical peripheral wall extending in the axial direction of the rotation shaft from the outer peripheral edge of the side wall. The connecting drum is integrally connected to the peripheral wall of the first cylinder tube. On the other hand, the second hydraulic cylinder includes a second cylinder tube that constitutes a hydraulic chamber for moving the second piston, and the second cylinder tube is fixed to the rotating shaft at a position inside the first piston. Accordingly, the first piston is advanced and retracted along the inner surface side of the connecting drum, and the second piston is further advanced and retracted along the first piston inner surface side.

Here, the friction plate of the second friction engagement means exists between the first piston and the friction plate of the first friction engagement means, but a notch is formed in the friction plate of the second friction engagement means. The first piston comes into contact with the friction plate of the first friction engagement means through the notch.
Japanese Patent No. 3743425

  However, in the clutch device disclosed in Patent Document 1, when the friction plate of the first friction engagement means is pressed by the first piston and at the same time the friction plate of the second friction engagement means is pressed by the second piston. The pressing force by both pistons is applied to the connecting drum through the stopper. At this time, not only the force acts on the connecting drum in the direction away from the cylinder tubes of both hydraulic cylinders, but in particular, the second piston closer to the rotation axis than the first piston is located at a position relatively far from the connecting drum. 2 In order to apply a pressing force by abutting against the friction plate of the friction engagement means, the pressing force received by the stopper expands the leading end side of the connecting drum (the position opposite to both hydraulic cylinders) in an oblique direction. The first cylinder tube is applied with a pulling force toward the connecting drum, and an excessive bending moment is generated. Therefore, in order to give the connecting drum and the first cylinder tube strength sufficient to counter the bending moment at this time, it is conceivable to make the wall thickness relatively large. There is an inconvenience that the apparatus becomes large and heavy.

  In view of the above points, the present invention can suppress a large bending moment generated in the first cylinder tube even when the first friction engagement means and the second friction engagement means are operated. It is an object of the present invention to provide a clutch device that can be formed in a lightweight and compact manner without requiring an increase in thickness.

  In order to solve this problem, according to the present invention, a first cylinder tube is fixed to the rotating shaft around the rotating shaft, and a first piston held by the first cylinder tube extends along the axis of the rotating shaft. A first hydraulic cylinder that moves forward and backward, and a second cylinder tube that is adjacent to the first piston side of the first hydraulic cylinder is positioned on the inner side surrounded by the first piston, and is fixed to the rotating shaft, A second piston held by the second cylinder tube is integrally connected to a second hydraulic cylinder in which the second piston advances and retreats along the axis of the rotary shaft, and a peripheral edge on the advance side of the first piston in the first cylinder tube. A connecting drum formed concentrically with the rotating shaft and extending along the advancing direction of the first piston and the second piston, and a first friction engagement provided on the inner periphery of the connecting drum Means and A first connecting member connected to the connecting drum via the first friction engaging means, and located between the first friction engaging means and the second hydraulic cylinder, on the inner periphery of the connecting drum; Second friction engagement means provided, and a second connection member connected to the connection drum via the second friction engagement means, and the first friction engagement means is connected to the connection drum. A plurality of friction plates arranged slidably in the axial direction, and a member that is alternately arranged with each friction plate supported by the first connecting member and that engages with the friction plate by pressure contact of the friction plate. A plywood plate and a stopper fixed to the connecting drum and stopping sliding of each friction plate and each engaging plate on the opposite side of the first piston, and the second friction engaging means is provided on the connecting drum. A plurality of friction plates arranged slidably in the axial direction and supported by the second connecting member. An engagement plate that is alternately arranged with each friction plate and engages with the friction plate by pressure contact of the friction plate, and a sliding member that is fixed to the connecting drum and that slides between the friction plate and each engagement plate. The first piston extends toward the friction plate of the first friction engagement means through a notch formed in each friction plate of the second friction engagement means. , By supplying hydraulic oil to the hydraulic chamber formed by the first cylinder tube, the friction plate and the engagement plate of the first friction engagement means are pressed and frictionally engaged with each other, and the second piston is In the clutch device that presses the friction plate and the engagement plate of the second friction engagement means by supplying hydraulic oil to the hydraulic chamber formed by the two cylinder tubes and frictionally engages the second friction engagement means, the second cylinder tube in the second cylinder tube On the advancing side of the piston A plurality of protrusions protruding toward the outer side in the radial direction of the second cylinder tube are disposed on the peripheral edge at a predetermined interval in the circumferential direction of the second cylinder tube, A through hole through which each projection of the second cylinder tube penetrates to allow the first piston to advance and retreat is provided, and the second cylinder tube is provided at a peripheral edge of the first cylinder tube on the advancing side of the first piston. Each of the projections is provided with an abutting portion that abuts in the axial direction of the rotating shaft.

  When hydraulic oil is supplied to the hydraulic chamber of the second cylinder tube, thrust is generated in the second piston and the second piston advances, whereby the friction plate and the engagement plate of the second friction engagement means are pressed to each other. Press contact. At the same time, in the second cylinder tube that receives the thrust of the second piston, a thrust is generated in the direction opposite to the advancing direction of the second piston as a reaction force of the second piston. According to the present invention, since the protrusion provided on the second cylinder tube is in contact with the contact portion of the first cylinder tube, the thrust generated in the second cylinder tube is transmitted via the protrusion and the contact portion. It can be transmitted to the first cylinder tube and the connecting drum. As a result, even when the second piston presses the friction plate and the engagement plate, even if a bending moment in a direction converging toward the rotation axis is generated on the first cylinder tube, the thrust of the second cylinder tube impinges. The bending moment generated in the first cylinder tube is canceled by being transmitted to the first cylinder tube and the connecting drum via the portion and the contact portion.

  Therefore, even if the pressing force of the first piston and the second piston is simultaneously transmitted to the connecting drum via each friction plate, the bending moment generated in the first cylinder tube can be suppressed to a small value, and the bending moment is counteracted. For this reason, since it is not necessary to increase the thickness of the first cylinder tube, a lightweight and compact clutch device can be obtained.

  An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing the clutch device of the present embodiment, FIG. 2 is an explanatory view showing the relationship between the friction plate of the first friction engagement means and the connecting drum, and FIG. 3 is the friction plate of the second friction engagement means. FIG. 4 is an explanatory diagram showing the relationship between the connecting drum and the first piston, FIG. 4 is an explanatory diagram showing the relationship between the second cylinder tube and the first piston, and FIG. 5 is an explanation showing the operation of the main part of the clutch device of this embodiment. FIG.

  The clutch device of the present embodiment is provided in an automatic transmission of a vehicle (not shown). When the automatic transmission shifts the rotation from the torque converter by the plurality of planetary gears, the plurality of rotating elements of each planetary gear are included. The predetermined rotating elements are connected and disconnected.

  As shown in FIG. 1, the clutch device 1 of the present embodiment includes a first friction engagement means 2 and a second friction engagement means 3, and a first friction engagement means 2 for operating the first friction engagement means 2. 1 hydraulic cylinder 4 and a second hydraulic cylinder 5 for operating the second friction engagement means 3 are provided.

  The first frictional engagement means 2 transmits power releasably between an input shaft 6 that is a rotating shaft and a first rotating member 7 that is a first connecting member (one of the rotating elements described above). The second friction engagement means 3 transmits the power releasably between the input shaft 6 and the second rotating member 8 (the other one of the rotating elements described above) that is the second connecting member.

  Regarding these positional relationships, the second friction engagement means 3 and the second hydraulic cylinder 5 are disposed between the first friction engagement means 2 and the first hydraulic cylinder 4, and the second friction engagement means 3 is The first friction engagement means 2 and the second hydraulic cylinder 5 are disposed. The first rotating member 7 is located inside the first friction engaging means 2, and the second rotating member 8 is located inside the second friction engaging means 3.

  Each of the first hydraulic cylinder 4 and the second hydraulic cylinder 5 has an annular shape centering on the input shaft 6, and is disposed integrally with the input shaft 6. It can be rotated integrally around the axis.

  The first hydraulic cylinder 4 is formed in a bottomed cylindrical shape having an opening on one side and fixed to the input shaft 6 so as to be immovable. The first hydraulic cylinder 4 has an axis of the input shaft 6 in the first cylinder tube 9. And a first piston 10 movably fitted along the first piston 10. A hydraulic chamber 11 is formed between the first cylinder tube 9 and the first piston 10, and hydraulic oil is supplied from the oil passage 12 into the hydraulic chamber 11, so that the first piston 10 advances ( That is, the first friction engagement means 2 is frictionally engaged. Seal members 13 and 14 such as rubber for sealing the hydraulic chamber 11 in a liquid-tight manner are provided on the inner and outer peripheral portions of the first piston 10.

  The first cylinder tube 9 includes a side wall 15 integrally connected to the input shaft 6, and a peripheral wall 16 that extends from the outer peripheral edge of the side wall 15 concentrically with the input shaft 6 in the axial direction. The peripheral wall 16 serves as a piston wall facing the first piston 10 and guides the first piston 10 in the forward / backward direction. A connecting drum 17 that is formed in a cylindrical shape concentric with the input shaft 6 and extends in the axial direction of the input shaft 6 is integrally provided on the peripheral edge of the peripheral wall 16 of the first cylinder tube 9. Thereby, the connecting drum 17 rotates integrally with the input shaft 6 via the first cylinder tube 9.

  The first piston 10 includes a plurality of extending portions 18 that pass through the second friction engaging means 3 and extend toward the first friction engaging means 2. 1 An annular pressing plate 19 that presses the friction engagement means 2 to frictionally engage is provided.

  The second hydraulic cylinder 5 is provided between the first hydraulic cylinder 4 and the second friction engagement means 3 so as to be adjacent to the first hydraulic cylinder 4, and is formed in a bottomed cylindrical shape with one side opened. A second cylinder tube 20 fixed to the input shaft 6 so as not to move, and a second piston 21 fitted in the second cylinder tube 20 so as to be movable along the axis of the input shaft 6. . A hydraulic chamber 22 is formed between the second cylinder tube 20 and the second piston 21, and hydraulic oil is supplied from the oil passage 23 into the hydraulic chamber 22, so that the second piston 21 becomes the first piston. The second friction engagement means 3 is frictionally engaged by advancing in the same direction as 10 (that is, projecting to the left in FIG. 1). Seal members 24 and 25 such as rubber for sealing the hydraulic chamber 22 in a liquid-tight manner are provided on the inner and outer peripheral portions of the second piston 21.

  The second cylinder tube 20 includes a side wall 26 that is integrally connected to the input shaft 6, and a peripheral wall 27 that extends from the outer peripheral edge of the side wall 26 concentrically with the input shaft 6 in the axial direction. The peripheral wall 27 serves as a piston wall facing the two pistons 21 and guides the second piston 21 in the forward / backward direction.

  A plurality of projecting portions 28 projecting radially outward are integrally provided on the peripheral edge of the peripheral wall 27 of the second cylinder tube 20 at a predetermined interval in the circumferential direction. Each protrusion 28 extends toward the inner peripheral surface of the connecting drum 17 via the first piston 10, further bends at the tip thereof, and the portion facing the first cylinder tube 9 is the first cylinder tube 9. It abuts against a contact portion 29 formed at the peripheral edge of the peripheral wall 16.

  The first friction engagement means 2 includes a large number of friction plates 30 disposed on the inner peripheral side of the connecting drum 17 and an outer peripheral side of the first rotating member 7 that is alternately disposed with the large number of friction plates 30. And a large number of engagement plates 31 supported by each other. The friction plate 30 is mounted on the inner peripheral side of the connecting drum 17 so as not to rotate and to be movable in the axial direction of the connecting drum 17, and the engaging plate 31 cannot be rotated on the outer peripheral side of the first rotating member 7 and the first rotating member. 7 is mounted so as to be movable in the axial direction. When the first piston 10 presses the friction plate 30 and the engagement plate 31, the friction plate 30 and the engagement plate 31 are frictionally engaged with each other, and the first rotation member 7 is connected to the input shaft 6. On the opposite side of the pressing direction of the first piston 10, a pressure plate 32 supported by the connection drum 17 is provided, and the movement of the pressure plate 32 is restricted by a circlip 33 which is a stopper fitted to the connection drum 17. ing. As a result, when the pressing plate 19 on the distal end side of the first piston 10 comes into contact with and presses against the friction plate 30 at the endmost position facing the pressing plate 19, the friction plate 30 and the engagement plate 31 come into close contact with each other. Thus, the pressure is applied between the pressing plate 19 and the pressure plate 32, and the connecting drum 17 and the first rotating member 7 are connected.

  The second friction engagement means 3 is located between the first friction engagement means 2 and the second hydraulic cylinder 5, and a large number of friction plates 34 disposed on the inner peripheral side of the connecting drum 17, And a plurality of engagement plates 35 arranged alternately with the friction plates 34 and supported on the outer peripheral side of the second rotating member 8. The friction plate 34 is mounted on the inner peripheral side of the connecting drum 17 so as not to rotate and to be movable in the axial direction of the connecting drum 17, and the engaging plate 35 cannot be rotated on the outer peripheral side of the second rotating member 8 and is second rotating member. 8 is movably mounted in the axial direction. Then, when the second piston 21 presses the friction plate 34 and the engagement plate 35, the friction plate 34 and the engagement plate 35 are frictionally engaged with each other, and the second rotating member 8 is connected to the input shaft 6. On the opposite side of the pressing direction of the second piston 21, a pressure plate 36 supported by the connection drum 17 is provided, and the movement of the pressure plate 36 is restricted by a circlip 37 which is a stopper fitted to the connection drum 17. ing. As a result, when the second piston 21 presses the friction plate 34 at the extreme end facing the second piston 21, the friction plate 34 and the engagement plate 35 are brought into close contact with each other and are sandwiched between the second piston 21 and the pressure plate 36. The connecting drum 17 and the second rotating member 8 are connected to each other.

  Here, the friction plate 30 of the first friction engagement means 2 is formed in a gear shape with a plurality of recesses 30a provided at a plurality of positions at equal intervals in the circumferential direction of the outer peripheral edge as shown in FIG. The concave portion 30a is supported so as to mesh with the connecting drum 17 by corresponding to the plurality of guide convex portions 17a formed on the inner peripheral surface side of the connecting drum 17. Further, as shown in part of FIG. 3, the friction plate 34 of the second friction engagement means 3 is formed in a gear shape with a plurality of concave portions 34a provided at a plurality of circumferential positions on the outer peripheral edge portion. Is supported so as to mesh with the connecting drum 17 by corresponding to the guide convex portion 17a formed on the inner peripheral surface side of the connecting drum 17. Furthermore, although only one place is shown in FIG. 3, the friction plate 34 of the second friction engagement means 3 is formed with a notch 34b through which the extension 18 of the first piston 10 is inserted. A plurality of extending portions 18 of the first piston 10 are provided at intervals in the circumferential direction (FIG. 3 shows only one of them), whereby the first piston 10 is in the second friction engagement. The friction plate 30 of the first friction engagement means 2 can be pressed via the pressing plate 9 without interfering with the friction plate 34 of the means 3. The extending portion 18 of the first piston 10 is formed with a convex portion 18a corresponding to the pair of guide convex portions 17a so that the sliding of the connecting drum 17 in the axial direction is accurately guided. It has become.

  Further, the projecting portion 28 of the second cylinder tube 20 extends between the extending portions 18 of the first piston 10 and extends to the outside of the first piston 10, and as shown in FIG. It protrudes corresponding to the plurality of guide convex portions 17a formed on the surface side. That is, the interval 18 b between the plurality of extending portions 18 provided in the circumferential direction of the first piston 10 is a through hole through which the protruding portion 28 of the second cylinder tube 20 passes.

  Returning to FIG. 1, the first hydraulic cylinder 4 uses the second cylinder tube 20 of the second hydraulic cylinder 5 as a retainer, and a first centrifugal hydraulic pressure cancellation chamber is provided between the second cylinder tube 20 and the first piston 10. 38 is formed. The first centrifugal hydraulic pressure cancel chamber 38 is opposed to the hydraulic chamber 11 of the first cylinder tube 9 via the first piston 10, and hydraulic oil is supplied from the oil passage 39, so that the input shaft 6 rotates. The centrifugal hydraulic pressure generated in the hydraulic chamber 11 of the first cylinder tube 9 is canceled. The outer surface side of the peripheral wall 27 of the second cylinder tube 20 is in contact with the inner peripheral surface of the first piston 10 via a seal member 40 such as rubber, and the first centrifugal hydraulic pressure cancellation chamber 38 allows the movement of the first piston 10. While being liquid-tightly sealed. A return spring 41 is disposed in the first centrifugal oil pressure cancel chamber 38, and the first piston 10 is moved backward in response to a decrease in the oil pressure in the oil pressure chamber 11 of the first cylinder tube 9, and the first friction engagement means. Release 2

  The second hydraulic cylinder 5 includes a retainer 42 that is integrally disposed on the input shaft 6, and a second centrifugal hydraulic pressure cancellation chamber 43 is formed between the second hydraulic cylinder 5 and the second piston 21. The second centrifugal hydraulic pressure cancel chamber 43 is provided opposite to the hydraulic chamber 22 of the second cylinder tube 20 via the second piston 21, and the hydraulic oil is supplied from the oil passage 44, whereby the input shaft 6. The centrifugal hydraulic pressure generated in the hydraulic chamber 22 due to the rotation of is canceled. The outer peripheral edge of the retainer 42 is in contact with the inner peripheral surface of the second piston 21 via a seal member 45 such as rubber, and the second centrifugal hydraulic pressure cancel chamber 43 is liquid-tightly sealed while allowing the second piston 21 to move. ing. A return spring 46 is disposed in the second centrifugal hydraulic pressure canceling chamber 43, and the second piston 21 is retracted in response to a decrease in the hydraulic pressure in the hydraulic chamber 22 of the second cylinder tube 20, and second friction engagement means. Release 3

  In the clutch device 1 of the present embodiment configured as described above, when hydraulic fluid is supplied from the oil passage 12 to the hydraulic chamber 11 of the first cylinder tube 9, as shown in FIG. Thrust is generated, and the first piston 10 moves forward to press the friction plate 30 and the engagement plate 31 of the first friction engagement means 2. The pressing force is transmitted to the connecting drum 17 via the pinching plate 32 and the circlip 33. In this state, when hydraulic oil is further supplied from the oil passage 23 to the hydraulic chamber 22 of the second cylinder tube 20, thrust is generated in the second piston 21, and the friction plate 34 of the second friction engagement means 3 moves forward. And the engagement plate 35 is pressed. The pressing force is transmitted to the connecting drum 17 via the pinching plate 36 and the circlip 37. At this time, the friction plate 34 and the engagement plate 35 of the second friction engagement means 3 by the second piston 21 with respect to the pressing positions of the friction plate 30 and the engagement plate 31 of the first friction engagement means 2 by the first piston 10. In combination with the fact that the pressing position is shifted to the inside of the connecting drum 17, the connecting drum 17 is given a pressing force in the direction of increasing its diameter obliquely on the tip end side (left end side in FIG. 5). Thus, a bending moment as indicated by an arrow M is generated in the first cylinder tube 9 in the pressing direction of the pistons 10 and 21. Such a bending moment M does not cause the connecting drum 17 and the first cylinder tube 9 to be deformed, but may cause a decrease in durability of the connecting drum 17 and the first cylinder tube 9. Therefore, in the present embodiment, the projecting portion 28 is provided on the second cylinder tube 20, and the projecting portion 28 is kept in contact with the contact portion 29 of the first cylinder tube 9, thereby suppressing the bending moment M. To do.

  That is, when hydraulic oil is supplied from the oil passage 23 to the hydraulic chamber 22 of the second cylinder tube 20, thrust is generated in the second piston 21, and at the same time, the advance direction of the second piston 21 also in the second cylinder tube 20. A thrust as indicated by an arrow P is generated in the opposite direction. The thrust P is transmitted to the first cylinder tube 9 via the protrusion 28 and the contact portion 29, and acts to cancel the bending moment M. As a result, the bending moment M can be suppressed, and it is not necessary to increase the thickness of the first cylinder tube 9, so that the lightweight and compact clutch device 1 can be obtained.

A sectional view showing a clutch device of one embodiment of the present invention. Explanatory drawing which shows the relationship between the friction plate of a 1st friction engagement means, and a connection drum. Explanatory drawing which shows the relationship between the friction plate of a 2nd friction engagement means, a connection drum, and a 1st piston. Explanatory drawing which shows the relationship between a 2nd cylinder tube and a 1st piston. Explanatory drawing which shows the action | operation of the principal part of the clutch apparatus of this embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Clutch apparatus, 2 ... 1st friction engagement means, 3 ... 2nd friction engagement means, 4 ... 1st hydraulic cylinder, 5 ... 2nd hydraulic cylinder, 6 ... Input shaft (rotating shaft), 7 ... 1st Rotating member (first connecting member), 8 ... second rotating member (second connecting member), 9 ... first cylinder tube, 10 ... first piston, 11, 22 ... hydraulic chamber, 17 ... connecting drum, 18a ... interval (Through hole), 20 ... second cylinder tube, 21 ... second piston, 28 ... projection, 29 ... contact part, 30, 34 ... friction plate, 31, 35 ... engagement plate, 33, 37 ... circlip ( Stopper), 34b ... notch.

Claims (1)

A first hydraulic cylinder in which a first cylinder tube is fixed to the rotation shaft around the rotation shaft, and a first piston held by the first cylinder tube advances and retreats along an axis of the rotation shaft;
A second cylinder tube adjacent to the first piston side of the first hydraulic cylinder is positioned on the inner side surrounded by the first piston, fixed to the rotating shaft, and held by the second cylinder tube. A second hydraulic cylinder in which a second piston advances and retreats along the axis of the rotary shaft;
The first cylinder tube is integrally connected to a peripheral end edge of the first piston on the advance side, and is formed in a cylindrical shape concentric with the rotation shaft, along the advance direction of the first piston and the second piston. A connecting drum that extends,
First friction engagement means provided on the inner periphery of the connecting drum;
A first coupling member coupled to the coupling drum via the first friction engagement means;
Second friction engagement means provided between the first friction engagement means and the second hydraulic cylinder and provided on the inner periphery of the connecting drum;
A second coupling member coupled to the coupling drum via the second friction engagement means,
The first friction engagement means includes a plurality of friction plates slidably disposed in the axial direction on the connection drum, and is alternately disposed with the friction plates supported by the first connection member. An engagement plate that engages with the friction plate by pressure contact of the friction plate, and a stopper that is fixed to the connecting drum and stops sliding of each friction plate and each engagement plate on the opposite side of the first piston,
The second friction engagement means is arranged alternately with each friction plate supported by the second connection member, and a plurality of friction plates slidably arranged in the axial direction on the connection drum. An engagement plate that engages with the friction plate by pressure contact of the friction plate, and a stopper that is fixed to the connecting drum and stops sliding of each friction plate and each engagement plate on the opposite side of the second piston,
The first piston extends through a notch formed in each friction plate of the second friction engagement means toward the friction plate of the first friction engagement means, and is formed by the first cylinder tube. By supplying hydraulic oil to the hydraulic chamber, the friction plate and the engagement plate of the first friction engagement means are pressed and frictionally engaged with each other;
In the clutch device, the second piston presses the friction plate and the engagement plate of the second friction engagement means by supplying hydraulic oil to the hydraulic chamber formed by the second cylinder tube to frictionally engage each other.
A plurality of protrusions projecting outward in the radial direction of the second cylinder tube are provided at a circumferential end edge of the second cylinder tube on the advancing side of the second piston at a predetermined interval in the circumferential direction of the second cylinder tube. Exist and arrange,
The first piston is provided with a through hole through which each projection of the second cylinder tube penetrates to allow the first piston to advance and retreat,
The clutch device according to claim 1, wherein an abutting portion in which each protrusion of the second cylinder tube abuts in the axial direction of the rotation shaft is provided at a peripheral end edge of the first cylinder tube on the advancing side of the first piston.

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