JP5793063B2 - Power transmission device - Google Patents

Description

  The present invention relates to a power transmission device applied to a vehicle.

  Conventionally, as a power transmission device, a first clutch output shaft as a first rotating member, a second clutch output shaft as a second rotating member rotatable relative to the first clutch output shaft, and a first clutch output shaft And a hub member as an engaging member connectable to the second clutch output shaft, a first clutch plate as a first friction clutch provided between the first clutch output shaft and the hub member, and a second clutch A second clutch plate as a second friction clutch provided between the output shaft and the hub member and disposed on the inner diameter side of the first clutch plate; a first clutch piston hydraulic chamber as a first hydraulic chamber; A first clutch piston as a first pressing member that operates by receiving the hydraulic pressure of the one clutch piston hydraulic chamber and presses the first clutch plate, and a second clutch as a second hydraulic chamber A piston hydraulic chamber and a second clutch piston as a second pressing member that is actuated by receiving the hydraulic pressure of the second clutch piston hydraulic chamber and presses the second clutch plate are known (for example, patents). Reference 1).

  In this power transmission device, a first clutch piston hydraulic chamber is formed by a first clutch input drum connected to a hub member and a first clutch piston, and a second clutch piston hydraulic chamber is connected to the hub member. It is formed by the input drum and the second clutch piston.

  A first clutch spring is disposed between the first clutch piston and the second clutch input drum to bias the first clutch piston in the direction of releasing the connection of the first clutch plate, and the second clutch piston and the hub member. A second clutch spring that biases the second clutch piston in the direction of releasing the connection of the second clutch plate is disposed between the fixed member that is restricted in movement in the axial direction.

JP 2005-98409 A

  However, in the power transmission device as described above, since the first hydraulic chamber and the second hydraulic chamber are provided separately from each other, many members are required to partition the two hydraulic chambers. In addition, the number of parts is increased, and the arrangement space for the two hydraulic chambers is also required, which increases the size of the apparatus.

  Moreover, since the 1st clutch spring and the 2nd clutch spring which urge the 1st press member and the 2nd press member in the connection release direction of a friction clutch are each arrange | positioned in the space part different from a hydraulic chamber, these arrangement | positioning The equipment was enlarged due to space.

  Accordingly, an object of the present invention is to provide a power transmission device that can be miniaturized in a power transmission device having a hydraulic chamber that operates two pressing members that press two friction clutches.

The present invention includes a first rotating member, a second rotating member that can rotate relative to the first rotating member, an engaging member that can be connected to the first rotating member and the second rotating member, and the first rotating member. A first friction clutch provided between the rotation member and the engagement member, and a second friction clutch provided between the second rotation member and the engagement member and disposed on the inner diameter side of the first friction clutch. A friction clutch, a first hydraulic chamber formed in the engaging member, a first pressing member that operates by receiving the hydraulic pressure of the first hydraulic chamber and presses the first friction clutch, and the first pressing member A power transmission device comprising: a second hydraulic chamber formed by the engaging member; and a second pressing member that operates under pressure of the second hydraulic chamber and presses the second friction clutch, On the opposite side of the second hydraulic chamber across the second pressing member is the first pressing member. Is formed between the the member second pressing member, the third hydraulic chamber is provided to the first hydraulic chamber in communication with said first pressing member, the receiving hydraulic pressure of the second hydraulic chamber first friction clutch The second pressing member is actuated in the direction of releasing the connection of the second friction clutch in response to the hydraulic pressure of the third hydraulic chamber .

  In this power transmission device, since the first hydraulic chamber and the second hydraulic chamber are formed by the engagement member, the first pressing member, and the second pressing member, the first hydraulic chamber and the second hydraulic chamber are connected to each other. The first pressing member and the second pressing member can be partitioned, and the number of parts can be reduced. In addition, by dividing the first hydraulic chamber and the second hydraulic chamber by the first pressing member and the second pressing member, the first hydraulic chamber and the second hydraulic chamber can be arranged close to each other, The apparatus can be miniaturized.

  Further, since the third hydraulic chamber is formed by the first pressing member and the second pressing member, the number of parts does not increase and the apparatus does not increase in size to provide the third hydraulic chamber.

  Therefore, in such a power transmission device, it is possible to reduce the size of the power transmission device having a hydraulic chamber that operates two pressing members that press two friction clutches.

  Advantageous Effects of Invention According to the present invention, there is an effect that it is possible to provide a power transmission device that can be miniaturized in a power transmission device having a hydraulic chamber that operates two pressing members that press two friction clutches.

It is sectional drawing of the power transmission device which concerns on embodiment of this invention.

  A power transmission apparatus according to an embodiment of the present invention will be described with reference to FIG.

  The power transmission device 1 according to the present embodiment includes a first rotating member 3, a second rotating member 5 that can rotate relative to the first rotating member 3, and the first rotating member 3 and the second rotating member 5. A third rotating member 7 as a connectable engaging member, a first friction clutch 9 provided between the first rotating member 3 and the third rotating member 7, a second rotating member 5 and a third rotating member 7, a second friction clutch 11 disposed between the first friction clutch 9 and the inner side of the first friction clutch 9, a first hydraulic chamber 13 formed in the third rotating member 7, and the hydraulic pressure of the first hydraulic chamber 13 The first pressure member 15 that operates in response to the pressure and presses the first friction clutch 9, the second hydraulic chamber 17 formed by the first pressure member 15 and the third rotating member 7, and the second hydraulic chamber 17 And a second pressing member 19 that operates by receiving the hydraulic pressure of the second friction clutch 11 and presses the second friction clutch 11. There.

  A third hydraulic chamber 21 formed by the first pressing member 15 and the second pressing member 19 on the opposite side of the second hydraulic chamber 17 across the second pressing member 19 and communicating with the first hydraulic chamber 13. Is provided.

  In the second hydraulic chamber 17, a restricting portion 23 that restricts the operation of the second pressing member 19 in the direction of releasing the connection of the second friction clutch 11 is provided.

  Further, the second hydraulic chamber 17 is disposed between the first pressing member 15 and the third rotating member 7 and urges the first pressing member 15 in the direction in which the first friction clutch 9 is disconnected. A member 25 is provided.

  The urging member 25 is in contact with the restricting portion 23.

  Further, oil passages 27 and 29 for supplying control oil to the first hydraulic chamber 13 and the second hydraulic chamber 17 are formed in the third rotating member 7.

  As shown in FIG. 1, a driving force is input to the first rotating member 3 and the second rotating member 5 from an input member 31. The input member 31 is rotatably supported by the casing 37 on both sides in the axial direction via a pair of bearings 33 and 35. The input member 31 includes a first input gear portion 39 coupled to the input member 31 so as to be integrally rotatable, and a first member that is continuous with the input member 31 and has a larger diameter than the first input gear portion 39. A two-input gear portion 41 is provided.

  In this input member 31, a clutch member (not shown) made of a dry single plate clutch is connected to a connecting portion 43 formed on the outer periphery of the axial end portion, so that driving force is transmitted from an engine (not shown) as a drive source. Is intermittent. In addition, a driving force from a motor generator (not shown) as a driving source is transmitted to the input member 31 via a speed change mechanism (not shown).

  The driving force from the driving source input to the input member 31 is transmitted to the first rotating member 3 at the first speed ratio via the first input gear portion 39 and the second input gear portion 41. Is transmitted to the second rotating member 5 at a second speed ratio.

  The first rotating member 3 includes a first gear member 45 and a first connecting member 47. The first gear member 45 is disposed on the second gear member 53 of the second rotating member 5 so as to be rotatable relative to the second rotating member 5 via needle bearings 49 and 51. The first gear member 45 is formed to have a larger diameter than the first input gear portion 39 and meshes with the first input gear portion 39. A first connecting member 47 is provided on the first gear member 45 so as to be integrally rotatable.

  The first connecting member 47 is fixed so as to be integrally rotatable with the first gear member 45 by a bolt as a fixing means. The first connecting member 47 is connected to the first friction clutch 9 and inputs the driving force transmitted at the first speed ratio to the first friction clutch 9. The second rotating member 5 is disposed adjacent to the first rotating member 3.

  The second rotating member 5 includes a second gear member 53 and a second connecting member 55. The second gear member 53 is disposed on the third shaft member 65 of the third rotating member 7 so as to be rotatable relative to the third rotating member 7 via needle bearings 57 and 59. The second gear member 53 is formed with a smaller diameter than the second input gear portion 41 and meshes with the second input gear portion 41. A second connecting member 55 is provided on the second gear member 53 so as to be integrally rotatable.

  The 2nd connection member 55 is connected with the 2nd gear member 53 by the spline-shaped connection part 61 so that integral rotation is possible. The second housing 63 is integrally fixed to the second connecting member 55 by fixing means such as welding. The second housing 63 is connected to the second friction clutch 11 and inputs the driving force transmitted at the second speed ratio to the second friction clutch 11. Such driving force from the first rotating member 3 and the second rotating member 5 is transmitted to the third rotating member 7.

  The third rotating member 7 includes a third shaft member 65, a third connecting member 67, and a third output gear member 69. The third shaft member 65 is rotatably supported by the casing 37 on both sides in the axial direction via a pair of bearings 71 and 73. Further, the third shaft member 65 is connected to the second friction clutch 11 and is rotated at the second speed ratio when the second friction clutch 11 is connected. A third connecting member 67 is provided on the third shaft member 65 so as to be integrally rotatable.

  One end side of the third connecting member 67 is fixed to the third shaft member 65 so as to be integrally rotatable with a welding portion as fixing means. The first housing 75 is integrally fixed to the other end side of the third connecting member 67 by fixing means such as welding. The first housing 75 is connected to the first friction clutch 9 and is rotated at the first speed ratio when the first friction clutch 9 is connected. On the opposite side of the third shaft member 65 provided with such a third connecting member 67, a third output gear member 69 is provided so as to be integrally rotatable.

  The third output gear member 69 is connected to the third shaft member 65 by a spline-shaped connecting portion 77 so as to be integrally rotatable. The third output gear member 69 meshes with a ring gear 79 formed with a larger diameter than the third output gear member 69 and outputs the driving force transmitted to the third rotating member 7 to the differential mechanism 81. The park lock gear 83 is provided on the third output gear member 69 so as to rotate integrally therewith. The park lock gear 83 is locked by a park lock actuator (not shown) when the vehicle is stopped, and the third rotation member 7. Prevent the rotation of.

  The differential mechanism 81 includes a differential case 85, a pinion shaft 87, a pinion 89, and a pair of side gears 91 and 93. The differential case 85 is rotatably supported by the casing 37 via bearings 95 and 97 at boss portions formed on both sides in the axial direction. The differential case 85 is rotationally driven by the driving force transmitted through the ring gear 79. In such a differential case 85, a pinion shaft 87, a pinion 89, and a pair of side gears 91 and 93 are accommodated.

  The pinion shaft 87 is engaged with the differential case 85 at its end and is prevented from being detached by a pin, and is rotated and driven integrally with the differential case 85. A pinion 89 is supported on the pinion shaft 87.

  The pinion 89 is supported by the pinion shaft 87 and revolves by the rotation of the differential case 85. The pinion 89 transmits a driving force to the pair of side gears 91 and 93 and is rotatably supported by the pinion shaft 87 so as to be driven to rotate when a differential rotation occurs between the pair of side gears 91 and 93 engaged with each other. ing.

  The pair of side gears 91 and 93 are supported by the differential case 85 so as to be relatively rotatable, and mesh with the pinion 89. The pair of side gears 91 and 93 is provided with a spline-shaped connecting portion on the inner peripheral side, and a shaft connected to the left and right wheels is connected to the side gears 91 and 93 so as to be integrally rotatable. Thus, the pair of side gears 91 and 93 outputs the driving force input to the differential case 85 to the left and right wheels via the shaft.

  The driving force transmitted to the third rotating member 7 that outputs the driving force to the differential mechanism 81 is the first friction clutch 9 and the second friction clutch at the first speed ratio and the second speed ratio, respectively. 11 and transmitted to the third rotating member 7 by the connection of the first friction clutch 9 and the second friction clutch 11.

  The first friction clutch 9 is connected to the outer diameter of the first connecting member 47 of the first rotating member 3 and the inner diameter of the first housing 75 of the third rotating member 7 so as to be axially movable and integrally rotatable. It consists of a plurality of clutch plates. When connected, the first friction clutch 9 transmits a driving force from the first rotating member 3 to the third rotating member 7 at a first speed ratio. A second friction clutch 11 is disposed on the inner diameter side of the first friction clutch 9 so as to overlap in the radial direction.

  The second friction clutch 11 is connected to the inner diameter of the second housing 63 of the second rotating member 5 and the outer diameter of the third shaft member 65 of the third rotating member 7 so as to be axially movable and integrally rotatable. It consists of a plurality of clutch plates. When connected, the second friction clutch 11 transmits a driving force from the second rotating member 5 to the third rotating member 7 at a second speed ratio.

  In the first friction clutch 9 and the second friction clutch 11, the control oil whose hydraulic pressure is controlled from the hydraulic mechanism 99 disposed at the end of the third rotating member 7 is supplied to the first hydraulic chamber 13 and the second hydraulic clutch 11. The first pressing member 15 and the second pressing member 19 that are supplied to the chamber 17 and are operated by the control oil supplied to the first hydraulic chamber 13 and the second hydraulic chamber 17 are intermittently operated.

  A hydraulic mechanism 99 serving as a control mechanism that controls the operation of the first pressing member 15 and the second pressing member 19 is disposed in the valve body 101 that is divided into two interior types and disposed inside the casing 37. An oil pump (not shown) driven by an electric motor (not shown) and a hydraulic circuit 103 provided in the valve body 101 are provided.

  The oil pump is composed of, for example, a gear pump in which two pump gears are combined. This oil pump is disposed on the end side of the third rotating member 7 in the valve body 101. The oil pump sucks oil stored in an oil reservoir in the casing 37 through an oil strainer that filters foreign matters, applies oil pressure to the oil, and causes the oil pressure circuit 103 to circulate.

  The hydraulic circuit 103 is formed by a plurality of oil passages and the like provided in the valve body 101, and stores a specified hydraulic pressure in the hydraulic chamber 105 by an oil pump driven by a small electric motor. Then, the control oil whose hydraulic pressure is controlled by a solenoid valve (not shown) passes through the oil passages 27 and 29 provided in the third shaft member 65 of the third rotating member 7 from the radial holes 107 and 109. Supplyed to the first hydraulic chamber 13 and the second hydraulic chamber 17, the first pressing member 15 and the second pressing member 19 are operated.

  The first hydraulic chamber 13 is between the outer peripheral surface of the third shaft member 65 of the third rotating member 7, the inner peripheral surface of the third connecting member 67, and the opposing surface of the third connecting member 67 of the first pressing member 15. And communicated with the oil passage 27 of the third shaft member 65. Further, seal rings 111 and 113 as sealing means are arranged between the third connecting member 67 and the first pressing member 15 and between the first pressing member 15 and the third shaft member 65, respectively. The hydraulic chamber 13 is partitioned. By supplying control oil from the hydraulic mechanism 99 to the first hydraulic chamber 13 via the oil passage 27, the first pressing member 15 is operated in the connecting direction of the first friction clutch 9.

  The first pressing member 15 is integrally formed with one side wall, an outer cylindrical wall and another side wall so as to surround the second pressing member 19, and is formed on the third shaft member 65 on the inner peripheral side of the one side wall. It is arranged so as to be movable in the axial direction, and is arranged so as to be able to move in the axial direction on the second pressing member 19 on the inner peripheral side of the other side wall. The first pressing member 15 has one end side restricted by the third connecting member 67 to move the first friction clutch 9 in the disengagement direction, and the other end side in the axial direction is connected to the plurality of clutch plates of the first friction clutch 9. Oppositely arranged in the axial direction. In the first pressing member 15, two members are integrally fixed by fixing means such as welding, but the one side wall, the outer cylindrical wall, and the other side wall are formed by separate members, respectively, Alternatively, one continuous member may be provided in another conceivable form.

  The first pressing member 15 is moved in the connecting direction of the first friction clutch 9 by the control oil supplied to the first hydraulic chamber 13, and presses the plurality of clutch plates of the first friction clutch 9 to first The friction clutch 9 is connected. A second hydraulic chamber 17 is provided on the inner diameter side of the first pressing member 15.

  The second hydraulic chamber 17 is between the outer peripheral surface of the third shaft member 65 of the third rotating member 7, the inner peripheral surface of the first pressing member 15, and the surface facing the first pressing member 15 of the second pressing member 19. And communicated with the oil passage 29 of the third shaft member 65. In addition, seal rings 115 and 117 as sealing means are disposed between the first pressing member 15 and the second pressing member 19 and between the second pressing member 19 and the third shaft member 65, respectively. The hydraulic chamber 17 is partitioned. By supplying control oil from the hydraulic mechanism 99 to the second hydraulic chamber 17 via the oil passage 29, the second pressing member 19 is operated in the connecting direction of the second friction clutch 11, and the first pressing member 15 is moved. The first friction clutch 9 is operated in the direction of releasing the connection.

  The second pressing member 19 is formed to be convex in the axial direction, is disposed on the third shaft member 65 so as to be movable in the axial direction, and is disposed to face the plurality of clutch plates of the second friction clutch 11 in the axial direction. Has been. Further, the second pressing member 19 is restricted from moving in the direction in which the second friction clutch 11 is disconnected by the restricting portion 23 such as a C-shaped clip fixed on the third shaft member 65 in the second hydraulic chamber 17. ing. The restricting portion 23 does not have to be a separate member such as a C-shaped clip that is integrally fixed to the third shaft member 65. For example, the protruding portion integrally formed with the third shaft member 65 or the first pressing member 15 Alternatively, another member integrally fixed to the first pressing member 15 may be used.

  The restriction portion 119 is provided with a restriction wall 119. The restriction wall 119 is provided with a hole through which the control oil supplied into the second hydraulic chamber 17 reaches the second pressing member 19. Between the restriction wall 119 and the first pressing member 15, that is, between the first pressing member 15 and the third rotating member 7, the first pressing member 15 is biased in the direction in which the first friction clutch 9 is disconnected. An urging member 25 is provided. The urging member 25 is a coil spring, but any urging member such as a disc spring may be used. By providing the urging member 25 in the second hydraulic chamber 17 as described above, it is not necessary to provide an arrangement space for arranging the urging member 25, and the apparatus does not increase in size.

  Here, the first pressing member 15 is moved in the connection release direction of the first friction clutch 9 by the control oil supplied into the second hydraulic chamber 17. For this reason, it is not necessary to provide the urging member 25 that urges the first pressing member 15 in the direction in which the first friction clutch 9 is disconnected. However, if oil remains in the first hydraulic chamber 13, The first pressing member 15 may be actuated in the connecting direction of the first friction clutch 9. Accordingly, the first pressing member 15 is biased in the direction in which the first friction clutch 9 is disconnected by the biasing member 25, so that the first pressing member 15 malfunctions when the control oil is supplied to the second hydraulic chamber 17. Thus, the second pressing member 19 can be reliably operated.

  Such a second pressing member 19 is moved and operated in the connecting direction of the second friction clutch 11 by the control oil supplied to the second hydraulic chamber 17 to press the plurality of clutch plates of the second friction clutch 11. The second friction clutch 11 is connected. At this time, the first pressing member 15 is moved in the direction of releasing the connection of the first friction clutch 9 by the control oil supplied to the second hydraulic chamber 17 and the biasing member 25, and the connection of the first friction clutch 9 is performed. Is released. A third hydraulic chamber 21 is provided on the opposite side of the second hydraulic chamber 17 with the second pressing member 19 interposed therebetween.

  The third hydraulic chamber 21 is formed in a portion covered by the opposing surfaces of the first pressing member 15 and the second pressing member 19, and the first hydraulic chamber 13 is formed by a communication path 121 provided in the first pressing member 15. Communicated with. Further, a seal ring 123 serving as a sealing means is disposed between the first pressing member 15 and the second pressing member 19, and the third hydraulic chamber 21 is partitioned. The control oil is supplied to the third hydraulic chamber 21 via the communication path 121 by supplying the control oil from the hydraulic mechanism 99 to the first hydraulic chamber 13 via the oil passage 27.

  By supplying control oil to the third hydraulic chamber 21, the first pressing member 15 is operated in the connecting direction of the first friction clutch 9, and the second pressing member 19 is disconnected from the second friction clutch 11. Operate in the direction. For this reason, it is not necessary to use a biasing member that biases the second pressing member 19 in the direction in which the second friction clutch 11 is disconnected, and it is not necessary to provide a space for arranging the biasing member. Further, since the first pressing member 15 is operated in the connecting direction of the first friction clutch 9 by the control oil supplied to the first hydraulic chamber 13 and the control oil supplied to the third hydraulic chamber 21, a small operation is performed. The first pressing member 15 can be operated with force.

  In the power transmission device 1 configured as described above, when the driving force is transmitted from the input member 31 to the differential mechanism 81 at the first speed ratio, the hydraulic mechanism 99 passes through the oil passage 27 to the first hydraulic chamber 13. Supply control oil. At this time, the control oil that has flowed into the first hydraulic chamber 13 is also supplied to the third hydraulic chamber 21 via the communication path 121. By the control oil in the first hydraulic chamber 13 and the third hydraulic chamber 21, the first pressing member 15 is actuated in the connecting direction of the first friction clutch 9 to connect the first friction clutch 9. At this time, the second pressing member 19 is actuated in the direction of releasing the connection of the second friction clutch 11 by the control oil in the third hydraulic chamber 21, and the connection of the second friction clutch 11 is released. When the first friction clutch 9 is connected, the driving force is transmitted from the first rotation member 3 to the third rotation member 7 via the first friction clutch 9, and the first rotation mechanism 7 transmits the first force to the differential mechanism 81. The driving force is output at the speed ratio.

  When driving force is transmitted from the input member 31 to the differential mechanism 81 at the second speed ratio, control oil is supplied from the hydraulic mechanism 99 to the second hydraulic chamber 17 via the oil passage 29. Due to the control oil in the second hydraulic chamber 17, the second pressing member 19 is actuated in the connecting direction of the second friction clutch 11 to connect the second friction clutch 11. At this time, the first pressing member 15 is actuated in the direction of releasing the connection of the first friction clutch 9 by the control oil of the second hydraulic chamber 17 and the biasing member 25, and the connection of the first friction clutch 9 is released. When the second friction clutch 11 is connected, the driving force is transmitted from the second rotation member 5 to the third rotation member 7 via the second friction clutch 11, and the second rotation member 7 transmits the second force to the differential mechanism 81. The driving force is output at the speed ratio.

  In such a power transmission device 1, the first hydraulic chamber 13 and the second hydraulic chamber 17 are formed by the third rotating member 7, the first pressing member 15, and the second pressing member 19. The chamber 13 and the second hydraulic chamber 17 can be partitioned by the first pressing member 15 and the second pressing member 19, and the number of parts can be reduced. In addition, by dividing the first hydraulic chamber 13 and the second hydraulic chamber 17 by the first pressing member 15 and the second pressing member 19, the first hydraulic chamber 13 and the second hydraulic chamber 17 are brought close to each other. Therefore, the apparatus can be downsized.

  Further, since the third hydraulic chamber 21 communicating with the first hydraulic chamber 13 is provided on the opposite side of the second hydraulic chamber 17 with the second pressing member 19 in between, the first hydraulic chamber 13 to the third hydraulic pressure are provided. The second pressure member 19 can be actuated in the direction in which the second friction clutch 11 is disconnected by the hydraulic pressure flowing into the chamber 21, and the second pressure member 19 is biased in the direction in which the second friction clutch 11 is disconnected. The force member can be abolished. For this reason, it is not necessary to provide an arrangement space for the urging member, and the apparatus can be miniaturized.

  Furthermore, since the third hydraulic chamber 21 is formed by the first pressing member 15 and the second pressing member 19, the number of parts does not increase to provide the third hydraulic chamber 21, and the size of the apparatus increases. There is nothing.

  Therefore, in such a power transmission device 1, it is possible to reduce the size of the power transmission device having a hydraulic chamber that operates two pressing members that press the two friction clutches.

  Further, since the restriction portion 23 for restricting the operation of the second pressing member 19 in the connection release direction of the second friction clutch 11 is provided in the second hydraulic chamber 17, the operating range of the second pressing member 19 is provided. And the intermittent characteristics of the second friction clutch 11 can be stabilized. In addition, since the restricting portion 23 is provided in the second hydraulic chamber 17, an increase in the size of the device can be suppressed.

  Further, the second hydraulic chamber 17 is disposed between the first pressing member 15 and the third rotating member 7 and urges the first pressing member 15 in the direction in which the first friction clutch 9 is disconnected. Since the member 25 is provided, when the control oil is supplied into the second hydraulic chamber 17, the first pressing member 15 is not actuated in the connecting direction of the first friction clutch 9, and the first friction clutch 9 erroneous connection can be prevented. In addition, since the urging member 25 is provided in the second hydraulic chamber 17, it is not necessary to provide an arrangement space for disposing the urging member 25, and the apparatus does not increase in size.

  In addition, since the urging member 25 is in contact with the restricting portion 23, the restriction of the second pressing member 19 in the direction in which the second friction clutch 11 is disconnected and the first pressing member 15 are in contact with the restricting portion 23. It is possible to have two functions of preventing malfunctions.

  Further, since the third rotating member 7 is formed with oil passages 27 and 29 for supplying control oil to the first hydraulic chamber 13 and the second hydraulic chamber 17, the first hydraulic chamber 13 and the second hydraulic chamber are provided. There is no need to separately provide a control oil supply path to the apparatus 17, and the apparatus can be downsized.

  In the power transmission device according to the embodiment of the present invention, the engagement member is the third rotation member. However, the engagement member is not the rotation member, for example, the engagement member is in the casing that houses the rotation member. May be integrally formed.

  In this case, since the first rotating member or the second rotating member is connected to the casing by connecting the first friction clutch or the second friction clutch, the rotation of the first rotating member or the second rotating member is stopped. To function.

DESCRIPTION OF SYMBOLS 1 ... Power transmission device 3 ... 1st rotation member 5 ... 2nd rotation member 7 ... 3rd rotation member 9 ... 1st friction clutch 11 ... 2nd friction clutch 13 ... 1st hydraulic chamber 15 ... 1st press member 17 ... 1st 2 Hydraulic chamber 19 ... 2nd press member 21 ... 3rd hydraulic chamber 23 ... Restriction part 25 ... Energizing member 27, 29 ... Oil path

Claims (6)

A first rotating member; a second rotating member rotatable relative to the first rotating member; an engaging member connectable to each of the first rotating member and the second rotating member; the first rotating member; A first friction clutch provided between the engagement member and a second friction clutch provided between the second rotation member and the engagement member and disposed on the inner diameter side of the first friction clutch; A first hydraulic chamber formed in the engaging member; a first pressing member that operates by receiving the hydraulic pressure of the first hydraulic chamber and presses the first friction clutch; the first pressing member and the engaging member; A power transmission device comprising: a second hydraulic chamber formed by the second hydraulic chamber; and a second pressing member that operates by receiving the hydraulic pressure of the second hydraulic chamber and presses the second friction clutch,
A third hydraulic chamber formed by the first pressing member and the second pressing member and communicating with the first hydraulic chamber is provided on the opposite side of the second hydraulic chamber across the second pressing member. ,
The first pressing member is actuated in a direction of releasing the connection of the first friction clutch by receiving the hydraulic pressure of the second hydraulic chamber,
The power transmission device according to claim 1, wherein the second pressing member is actuated in a direction of releasing the connection of the second friction clutch by receiving the hydraulic pressure of the third hydraulic chamber . The power transmission device according to claim 1,
The power transmission device according to claim 1, further comprising: a restricting portion that restricts the operation of the second pressing member in a connection release direction of the second friction clutch in the second hydraulic chamber. The power transmission device according to claim 2,
A biasing member that is disposed between the first pressing member and the engaging member and biases the first pressing member in a direction in which the first friction clutch is disconnected is provided in the second hydraulic chamber. A power transmission device characterized by that. The power transmission device according to claim 3,
The power transmission device, wherein the urging member is in contact with the restricting portion. The power transmission device according to any one of claims 1 to 4,
The power transmission device according to claim 1, wherein the engaging member is a third rotating member that is rotatable relative to the first rotating member and the second rotating member. The power transmission device according to claim 5,
An oil passage for supplying control oil to the first hydraulic chamber and the second hydraulic chamber is formed in the third rotating member.

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