JP6303916B2 - Automatic transmission - Google Patents

Description

  The present invention relates to an automatic transmission, and more particularly to an automatic transmission that automatically performs a shift operation in a manual transmission.

  Generally, in an automatic transmission mounted on a vehicle such as an automobile, an automatic transmission that automatically performs a shift operation and a clutch operation is added to a manual transmission (MT: Manual Transmission) of a parallel shaft gear type. An automatic transmission called AMT (Automated Manual Transmission) that enables automatic shifting is known. In a parallel shaft gear type manual transmission, a plurality of rotating shafts such as an output shaft and a counter shaft are housed in a transmission case in parallel with each other.

  Conventionally, this type of automatic transmission has a parking lock mechanism in which an input shaft and a counter shaft are arranged in parallel in a transmission case, a parking gear is arranged at the end of the counter shaft, and meshes with the parking gear. A parking pole is known that is swingably supported on a parking pole shaft disposed below a counter shaft (see Patent Document 1).

  Conventionally, in an automatic transmission using a planetary gear mechanism, a parking lock mechanism is provided with a parking pole, a spring, a cam support member, a parking rod and a bracket constituting the parking lock mechanism as a parking lock mechanism assembly in advance. There is a known structure in which the parking lock mechanism assembly is bolted to the transmission case (see Patent Document 2).

  The parking lock mechanism assembly described in Patent Document 2 supports a parking pole that meshes with a parking gear on a bracket having a case mounting portion in a swingable manner, and acts on a restoring force of a spring in a backward direction with respect to the parking pole. I am letting.

  In the parking lock mechanism assembly, a cam support member facing the parking pole is fixed to the bracket, and a parking rod having a cam is held between the parking pole and the cam support member. Thereby, the thing of patent document 2 has improved the assembly | attachment property of the parking mechanism to the transmission case.

JP 2001-146966 A JP-A-8-216842

  However, since the parking pole shaft is arranged below the counter shaft in the one described in Patent Document 1, it is necessary to enlarge the lower edge portion of the transmission case to the lower side, which increases the size of the transmission case. I was sorry.

  Moreover, since the thing of patent document 2 does not consider accommodating the parking lock mechanism compactly in a transmission case, the transmission case was enlarged. Therefore, the thing of patent document 1, 2 had the problem that an automatic transmission will be enlarged by providing a parking lock mechanism. When the automatic transmission becomes large, the weight of the automatic transmission increases, and the fuel efficiency of a vehicle equipped with the automatic transmission deteriorates.

  Further, since the automatic transmission described in Patent Document 1 has a plurality of rotating shafts arranged in parallel to each other, when the parking lock mechanism assembly described in Patent Document 2 is provided in the automatic transmission, the plurality of rotating shafts are arranged. Depending on the arrangement of the parking lock mechanism, the automatic transmission becomes large.

  The present invention has been made paying attention to the above-mentioned problems. A parking lock mechanism can be compactly arranged inside a transmission case that houses a plurality of rotation shafts parallel to each other. An object of the present invention is to provide an automatic transmission that can be used.

  The present invention includes a first shaft to which a parking gear is fixed, a second shaft disposed at a position obliquely below and parallel to the first shaft, a parking lock mechanism for restricting rotation of the first shaft, A transmission case that houses the first shaft, the second shaft, and the parking lock mechanism, wherein the transmission case includes an outer wall that circumferentially surrounds the first shaft and the second shaft, and the first shaft. A first through hole through which the second shaft penetrates, a second through hole through which the second shaft penetrates, and a plurality of fastening boss portions, and are arranged in the outer wall so as to be adjacent to the parking gear The parking lock mechanism is formed with a pawl portion that meshes with the teeth of the parking gear and is pivotally supported by the pivot shaft, and a pivot shaft that holds the pivot shaft A holding portion and a plurality of fastening holes are formed, and the front A retainer fastened to the fastening boss by a fastener passing through the fastening hole, parallel to a straight line passing through a center point of the first through hole and a center point of the second through hole, and When a virtual line in contact with the lower half of the tip circle of the parking gear is drawn and the center point of the first through hole and the center point of the second through hole are respectively projected on the virtual line, the rotation The shaft holding portion is disposed so as to intersect the virtual line between the projection point of the center point of the first through hole and the projection point of the center point of the second through hole with respect to the virtual line, and a plurality of the fastening holes At least one of the boss portions is arranged between the rotating shaft holding portion and the outer wall in a direction along the imaginary line and connected to the outer wall.

  As described above, according to the present invention, an imaginary line parallel to the straight line passing through the center point of the first through hole and the center point of the second through hole and in contact with the lower half of the tooth tip circle of the parking gear is drawn. When the center point of the first through-hole and the center point of the second through-hole are respectively projected on the imaginary line, the rotation axis holding unit projects the projection point and the second penetration point of the center point of the first through-hole with respect to the imaginary line. Arranged so as to intersect the imaginary line between the projection points of the center point of the hole.

  For this reason, since the parking pole and the rotating shaft can be arranged closer to the radial center of the transmission case, the parking pole can be accommodated in the transmission case without increasing the size of the transmission case.

  In this automatic transmission, when the pawl portion of the parking pole meshes with the parking gear to restrict the rotation of the parking gear, a load acts on the pawl portion of the parking pole in the tangential direction of the parking gear. Therefore, in the present invention, at least one of the plurality of fastening boss portions is disposed between the rotating shaft holding portion and the outer wall in a direction along the phantom line, and is connected to the outer wall.

  As a result, the load acting in the tangential direction of the parking gear can be transmitted from the rotating shaft holding portion to the outer wall of the transmission case through the fastening boss portion, so the load acting on the periphery of the through hole of the partition wall is reduced. Can be made. For this reason, since it is not necessary to reinforce the partition wall in order to withstand the load, it is possible to prevent the transmission case from being enlarged due to the reinforcement of the partition wall. As a result, the parking lock mechanism can be housed in a compact manner with respect to the transmission case housing a plurality of rotating shafts parallel to each other, and the automatic transmission can be reduced in size and weight.

FIG. 1 is a diagram showing an embodiment of an automatic transmission according to the present invention, and is a side view of the automatic transmission. FIG. 2 is a view showing an embodiment of the automatic transmission according to the present invention, and is a rear view of the parking lock mechanism disposed in the rear case of the automatic transmission as viewed from the rear. FIG. 3 is a view showing an embodiment of the automatic transmission according to the present invention, and is a cross-sectional view taken along the line II in FIG. 4 is a view showing an embodiment of the automatic transmission according to the present invention, and is a cross-sectional view taken along the line II-II in FIG. FIG. 5 is a view showing an embodiment of the automatic transmission according to the present invention, and is a cross-sectional view taken along the line III-III in FIG. FIG. 6 is a view showing an embodiment of the automatic transmission of the present invention, and is a rear view of the rear case of the automatic transmission as viewed from the rear.

  Embodiments of an automatic transmission according to the present invention will be described below with reference to the drawings. 1 to 6 are diagrams showing an automatic transmission according to an embodiment of the present invention.

  First, the configuration will be described. As shown in FIG. 1, an automatic transmission 2 is mounted on the vehicle 1, and the automatic transmission 2 is installed vertically below the floor panel of the vehicle 1 while being fixed to the engine 3. Yes. That is, the vehicle 1 of the present embodiment is a rear wheel drive vehicle.

  Here, in this embodiment, the front / rear, left / right, and up / down directions are indicated by arrows in the drawing so as to coincide with the front / rear direction, the left / right direction, and the up / down direction seen from the driver seated in the driver's seat of the vehicle 1. ing.

  The automatic transmission 2 includes a transmission case 2A. The transmission case 2A includes a front case 4 attached to the engine 3, a rear case 5 attached to the front case 4, and an extension attached to the rear case 5. The case 6 is constituted.

  A clutch (not shown) is provided between the front case 4 and the engine 3, and power transmission from the engine 3 to the automatic transmission 2 is interrupted by the clutch. A starter motor 103 is provided on the engine 3 side on the upper left side of the front case 4, and the starter motor 103 starts the engine 3 by rotating a flywheel (not shown) of the engine 3.

  As shown in FIGS. 2 and 5, the rear case 5 houses the output shaft 11 and the counter shaft 23 that constitute a part of the speed change mechanism 60. The speed change mechanism 60 is a parallel shaft gear type speed change mechanism, and has an input shaft (not shown) and a gear train for speed change in addition to the output shaft 11 and the counter shaft 23. They are arranged on the counter shaft 23 and the input shaft, respectively.

  The rear case 5 includes an outer wall 93 formed in a cylindrical shape and a partition wall 92 formed inside the outer wall 93. The outer wall 93 surrounds the output shaft 11 and the counter shaft 23 in the circumferential direction.

  The partition wall 92 is formed at the end of the rear case 5 on the extension case 6 side, and partitions the inside of the rear case 5 and the inside of the extension case 6 in the direction of the axis D1 (see FIG. 1) of the output shaft 11. The partition wall 92 penetrates the output shaft 11 and the counter shaft 23. The output shaft 11 constitutes the first axis of the present invention, and the counter shaft 23 constitutes the second axis of the present invention.

  The output shaft 11 is rotatably supported by the partition wall 92 and the extension case 6 of the rear case 5. On the side of the engine 3 on the axis D1 of the output shaft 11, an input shaft (not shown) is coaxially arranged. The front end portion of the output shaft 11 rotatably supports the rear end portion of the input shaft. The front end of the input shaft is connected to the clutch.

  The counter shaft 23 is rotatably supported by the partition wall 92 of the rear case 5. The counter shaft 23 is disposed obliquely below the output shaft 11 and extends in parallel with the axis D1 of the output shaft 11.

  Note that a partition wall (not shown) is also formed at the end of the front case 4 on the rear case 5 side, and this partition partitions the interior of the front case 4 from the interior of the rear case 5. A partition wall of the front case 4 rotatably supports an end portion of the counter shaft 23 on the engine 3 side and an end portion of the input shaft on the engine 3 side.

  In the automatic transmission 2, the speed change mechanism 60 is configured to form either the first to fifth forward shift speed or the reverse shift speed by switching the gear train to which power is transmitted from the input shaft to the output shaft 11. .

  In FIG. 1, a shift case 5 </ b> A is provided at the upper part of the rear case 5, and the shift case 5 </ b> A bulges upward from the upper part of the rear case 5. A shift and select shaft 34 is provided in the shift case 5A.

  The shift and select shaft 34 is provided on the shift case 5A so as to be rotatable and movable in the axial direction. The axis of the shift and select shaft 34 is orthogonal to the axis D1 of the output shaft 11.

  In the automatic transmission 2, the shift and select shaft 34 is reciprocated and rotated, so that the gear train is selected by the speed change mechanism 60, and either the forward speed or the marching speed of the first to fifth speed is selected. Will be changed.

  The transmission case 2 </ b> A is provided with an automatic transmission unit 35, and the automatic transmission unit 35 is connected to a shift and select shaft 34. The automatic transmission unit 35 includes a reserve tank 35a, a hydraulic pressure generator and a control device (not shown).

  The automatic transmission unit 35 pressurizes the hydraulic oil stored in the reserve tank 35a by a hydraulic pressure generator, moves the shift and select shaft 34 in the axial direction by the hydraulic pressure of the pressurized hydraulic oil, and rotates it around the axis.

  Further, the automatic transmission unit 35 connects or disconnects a clutch (not shown) by the hydraulic pressure of the hydraulic oil. The automatic transmission oil knit 35 changes the gear position by operating the shift and select shaft 34 and the clutch with hydraulic oil pressure.

  As shown in FIGS. 2 and 5, a parking gear 73 is attached to the output shaft 11 so as to be integrally rotatable. The parking gear 73 is disposed adjacent to the partition wall 92, and a parking pole 79 is engaged. It can be freely combined. The rear case 5 houses a parking lock mechanism 71 including a parking pole 79.

  As shown in FIG. 3, the parking lock mechanism 71 includes a manual shaft 74 that is rotated by the operating force of the shift lever at the driver's seat, a manual plate 75 that is fixed to the manual shaft 74, and a swing of the manual plate 75. A cam 77 that moves forward and backward in conjunction with a parking pole 79 is provided.

  The parking pole 79 swings between a position where the rotation of the output shaft 11 is restricted and a position where the rotation of the output shaft 11 is allowed by the advance and retreat of the cam 77. The parking lock mechanism 71 regulates the rotation of the output shaft 11 when the parking pole 79 meshes with the parking gear 73.

  An opening 94 is formed in the lower left portion of the outer wall 93 of the rear case 5, and a flange portion 95 is formed on the outer surface of the edge of the opening 94. A cover member (not shown) is fixed to the flange portion 95, and the opening 94 is closed by this cover member.

  As shown in FIG. 1, a lever 98 is fixed to the manual shaft 74 so as to be integrally rotatable outside the rear case 5, and one end of a parking cable 99 is connected to the lever 98.

  The other end of the parking cable 99 is connected to the shift lever of the driver's seat. The driver's seat shift lever is operated by the driver to move to any of the P (parking) range, R (reverse) range, N (neutral) range, and D (drive) range. One end of the parking cable 99 rotates the manual shaft 74 around the axis via the lever 98 according to the position where the shift lever is operated.

  Outside the rear case 5, the manual shaft 74 is provided with a position sensor 104. The position sensor 104 detects the rotational position of the manual shaft 74 and outputs a detection signal to a control unit (not shown).

  As shown in FIG. 3, a flat manual plate 75 is fixed to the manual shaft 74 so as to be integrally rotatable inside the rear case 5. The manual plate 75 is formed in a flat plate shape orthogonal to the axial direction of the manual shaft 74 and extends upward from the manual shaft 74.

  A parking rod insertion hole 75a is formed at the upper end portion of the manual plate 75, and a short shaft portion 76b of the parking rod 76 is inserted and prevented in parallel with the manual shaft 74 into the parking rod insertion hole 75a. Yes.

  A long shaft portion 76a extending in parallel with the output shaft 11 is connected to the short shaft portion 76b. The long shaft portion 76a advances in the arrow A1 direction by the rotation of the manual shaft 74 in the arrow R1 direction. The shaft 74 moves backward in the arrow A2 direction by rotating in the arrow R2 direction.

  A frustoconical cam 77 is attached to the distal end portion of the long shaft portion 76a of the parking rod 76 so as to be movable with respect to the long shaft portion 76a. Reduced diameter. A protruding stopper 76c is formed on the rear end side of the long shaft portion 76a.

  A compression coil spring 78 is mounted between the cam 77 of the long shaft portion 76a and the stopper 76c. The compression coil spring 78 elastically presses the cam 77 in the moving direction of the parking rod 76.

  The parking lock mechanism 71 includes a detent plate 80 fixed to the manual shaft 74, and a detent spring 88 that elastically engages the outer edge portion 80a of the detent plate 80 and positions the manual shaft 74 in the rotational direction. ing.

  Inside the rear case 5, a flat plate-shaped detent plate 80 is fixed to the manual shaft 74 so as to be integrally rotatable. The detent plate 80 is formed in a flat plate shape perpendicular to the axial direction of the manual shaft 74 and extends upward from the manual shaft 74.

  In the outer edge portion 80a of the detent plate 80, four engagement grooves 80p, 80r, 80n, and 80d are formed in order from the engine 3 side to the cam 77 side. A detent spring 88 is disposed above the detent plate 80.

  The detent spring 88 is composed of a leaf spring, the base end portion 88 b is fixed to the retainer 82, and the distal end portion 88 a is pressed against the outer edge portion 80 a of the detent plate 80. Thereby, the front-end | tip part 88a of the detent spring 88 is elastically engaged with either of the four engagement grooves 80p, 80r, 80n, and 80d.

  The detent spring 88 has a distal end portion 88a that is elastically engaged with any of the engagement grooves 80p, 80r, 80n, and 80d so that the manual shaft 74 does not rotate when the shift lever is not operated. The rotational position of the shaft 74 is held.

  In the detent spring 88, the tip end portion 88a is elastically engaged with any of the engagement grooves 80p, 80r, 80n, and 80d, thereby generating a sense of moderation when the shift lever is operated.

  As shown in FIGS. 2, 4, and 5, a parking pawl 79 is provided below the parking gear 73. The parking pawl 79 is parked at the pivot shaft holding portion 79b on the swing base end side. A pole rotation shaft 83 is supported so as to be swingable.

  A claw portion 79 a is formed on the side of the swinging tip portion of the parking pole 79 that faces the parking gear 73. The pawl portion 79a of the parking pole 79 meshes with the groove 73a of the parking gear 73 when the parking pole 79 is swung to the parking gear 73 side by the advancement of the cam 77.

  An arc-shaped retainer 82 is provided at the lower left and rear of the parking gear 73. The retainer 82 is disposed in a space between the output shaft 11 and the outer wall 93 so as to follow the outer periphery of the output shaft 11. Is curved.

  A fastening hole 82c and a fastening hole 82d are provided at the lower end and the upper end of the retainer 82, respectively. The retainer 82 is fastened to the fastening bosses 105 and 106 of the partition wall 92 by bolts 97a and 97b as fasteners passing through the fastening holes 82c and 82d, respectively.

  An extended portion 82 e is provided at the center of the retainer 82, and the extended portion 82 e extends from the outer edge portion 79 c of the parking pole 79 toward the outer wall 93. A return spring support shaft 84 is attached to the protruding portion 82e on the side of the partition wall 92, and the return spring support shaft 84 protrudes toward the partition wall 92 side. The return spring support shaft 84 constitutes the shaft member of the present invention.

  A return spring 87 is disposed on the outer periphery of the return spring support shaft 84. The return spring 87 is constituted by a torsion spring, and moves the parking pole 79 in a direction away from the parking gear 73 by an elastic force.

  One end of the return spring 87 is engaged with an upper portion of the parking pole 79 and stopped, and presses the parking pole 79 downward, that is, in a direction away from the parking gear 73. The other end of the return spring 87 is engaged with the cam support support shaft 86 and stopped.

  Cam support support shafts 85 and 86 are provided on the projecting portion 82e so as to face the partition wall 92, and a cam support member 81 is disposed on the cam support support shafts 85 and 86. The cam support member 81 is adjacent to the return spring support shaft 84. The cam support member 81 faces the parking pole 79 with the cam 77 interposed therebetween, and supports the tip of the long shaft portion 76a of the parking rod 76 and the cam 77 from below.

  The cam support member 81 defines the position of the parking pole 79 when the parking pole 79 is pressed in a direction away from the parking gear 73 by the return spring 87. A parking rod through hole 82a is formed in the overhanging portion 82e, and the long shaft portion 76a of the parking rod 76 passes through the parking rod through hole 82a.

  Further, a rotation shaft holding portion 82 b is formed on the partition wall 92 side of the retainer 82, and this rotation shaft holding portion 82 b holds the rear end of the parking pole rotation shaft 83. The front end of the parking pole rotation shaft 83 is held by a rotation shaft holding boss 109 (see FIG. 6) formed in the partition wall 92. The parking pole rotation shaft 83 constitutes the rotation shaft of the present invention.

  The parking pole rotation shaft 83 supports the parking pole 79 so as to be swingable. Further, the base end portion 88b of the detent spring 88 is fixed to the partition wall 92 side of the retainer 82 with a bolt 97c. The detent spring 88 is a plate spring as an elastic body. The cam support support shafts 85 and 86 support the cam support member 81.

  The retainer 82 is fixed to the partition wall 92 with bolts 97 in a state where the parking pole 79, the return spring 87, the cam support member 81, and the detent spring 88 are assembled.

  That is, these members are assembled and integrated with the retainer 82 to form an assembly. This assembly is disposed inside the rear case 5 through the opening 94 (see FIG. 3) of the rear case 5, and is fixed to the partition wall 92 by bolts 97a and 97b.

  As shown in FIGS. 2, 4, 5, and 6, the partition wall 92 is formed with a parking rod through hole 92 b through which the parking rod 76 passes and a detent spring through hole 92 c through which the detent spring 88 passes. .

  Further, the partition wall 92 is formed with an output shaft through hole 92d through which the output shaft 11 passes, a counter shaft through hole 92e through which the counter shaft 23 passes, and an oil circulation hole 92f through which oil flows. The output shaft through hole 92d constitutes the first through hole of the present invention, and the counter shaft through hole 92e constitutes the second through hole of the present invention.

  The partition wall 92 is formed with a plurality of fastening boss portions 105 and 106. The fastening boss portion 105 is disposed at a position near the outer wall 93 below the output shaft 11. Further, the fastening boss portion 106 is disposed at a position close to the outer wall 93 on the left side of the output shaft 11.

  A rib 107 is provided between the fastening boss portion 105 and the outer wall 93, and the rib 107 is connected to the fastening boss portion 105, the outer wall 93, and the partition wall 92. The fastening boss portion 105 is connected to the outer wall 93 through the rib 1075.

  Similarly, a rib 108 is provided between the fastening boss 106 and the outer wall 93, and the rib 108 is connected to the fastening boss 106, the outer wall 93, and the partition wall 92. The fastening boss 106 is connected to the outer wall 93 through the rib 108.

  The rotation shaft holding portion 82b is disposed at a position described below. That is, an imaginary line L2 is drawn which is parallel to a straight line L1 passing through the center point O1 of the output shaft through hole 92d and the center point O2 of the counter shaft through hole 92e and is in contact with the lower half of the tip circle C1 of the parking gear 73. When the center point O1 of the output shaft through hole 92d and the center point O2 of the counter shaft through hole 92e are respectively projected on the virtual line L2, the rotating shaft holding portion 82b is connected to the virtual axis L2. Between the projection point P1 of the center point O1 and the projection point P2 of the center point O2 of the counter shaft through hole 92e, it is arranged so as to intersect with the virtual line L2. Further, the fastening boss portions 105 and 106 are disposed between the rotation shaft holding portion 82b and the outer wall 93 in the direction along the virtual line L2.

  Next, the operation will be described. 2, 3, and 5, when the shift lever is operated to the P range, the manual shaft 74 and the manual plate 75 rotate in the direction of the arrow R1, the parking rod 76 moves forward in the direction of the arrow A1, and the compression coil. The spring 78 is compressed. At this time, the restoring force of the compression coil spring 78 exceeds the frictional force between the cam 77 and the parking pole 79 and the restoring force of the return spring 87.

  For this reason, the cam 77 enters between the cam support member 81 and the parking pole 79 while being supported by the cam support member 81 from below, and pushes the parking pole 79 up to the parking gear 73 side.

  At this time, when the groove 73a of the parking gear 73 faces the claw 79a of the parking pole 79, the claw 79a of the parking pole 79 meshes with the groove 73a. When the outer peripheral portion 73b of the parking gear 73 faces the claw portion 79a of the parking pole 79, the parking pole 79 stops with the claw portion 79a being in pressure contact with the outer peripheral portion 73b, and enters a standby state.

  When the output shaft 11 is slightly rotated by the movement of the vehicle 1 from the standby state, the pawl portion 79a of the parking pole 79 is engaged with the parking gear 73 by the restoring force of the compression coil spring 78.

  When the shift lever is operated in any of the R range, N range, and D range, the manual shaft 74 and the manual plate 75 rotate in the arrow R2 direction, and the parking rod 76 and the cam 77 retract in the arrow A2 direction. When the cam 77 moves backward, the parking pole 79 returns to the position defined by the cam support member 81 by the return spring 87 being restored.

  According to the automatic transmission 2 of the present embodiment, it is parallel to a straight line L1 passing through the center point O1 of the output shaft through hole 92d and the center point O2 of the counter shaft through hole 92e, and below the tip circle C1 of the parking gear 73. When the virtual line L2 in contact with the half is drawn and the center point O1 of the output shaft through hole 92d and the center point O2 of the counter shaft through hole 92e are respectively projected on the virtual line L2, the rotation shaft holding part 82b is Between the projection point P1 of the center point O1 of the output shaft through hole 92d and the projection point P2 of the center point O2 of the counter shaft through hole 92e with respect to the virtual line L2, the virtual line L2 is arranged to intersect.

  For this reason, since the parking pole 79 and the parking pole rotation shaft 83 can be disposed closer to the center of the transmission case 2A in the radial direction, the parking pole 79 can be installed in the transmission case without increasing the size of the transmission case 2A. Can be stored in 2A.

  In the automatic transmission 2, when the pawl portion 79 a of the parking pole 79 meshes with the parking gear 73 and restricts the rotation of the parking gear 73, the pawl portion 79 a of the parking pole 79 extends in the tangential direction of the parking gear 73. A load acts, and this load acts on the partition wall 92 via the parking pole rotation shaft 83 that supports the parking pole 79 so as to be swingable.

  Therefore, in the present embodiment, the fastening boss portions 105 and 106 are disposed between the rotation shaft holding portion 82b and the outer wall 93 in the direction along the virtual line L2, and are formed on the outer wall 93 via the ribs 107 and 108. Connected.

  As a result, the load acting in the tangential direction of the parking gear 73 can be transmitted from the rotating shaft holding portion 82b to the outer wall 93 of the transmission case 2A via the fastening boss portions 105 and 106. The load acting on the periphery of the through hole 92d and the counter shaft through hole 92e can be reduced.

  For this reason, since it is not necessary to reinforce the partition wall 92 to withstand the load, the transmission case 2A can be prevented from being enlarged because the partition wall 92 is reinforced.

  As a result, the parking lock mechanism 71 can be stored compactly in the transmission case 2A that stores the output shaft 11 and the counter shaft 23, and the automatic transmission 2 can be reduced in size and weight.

  According to the automatic transmission 2 of the present embodiment, the retainer 82 has a protruding portion 82e that extends from the outer edge portion 79c of the parking pole 79 to the outer wall 93 side, and protrudes toward the partition wall 92 side from this protruding portion 82e. A return spring support shaft 84 was attached. In addition, a torsion spring that moves the parking pole 79 away from the parking gear 73 is disposed on the outer periphery of the return spring support shaft 84.

  As a result, the parking pole rotation shaft 83 that supports the parking pole 79 so as to be swingable is disposed at the above-described position, so that the retainer 82 has a protruding portion 82e that extends from the outer edge portion 79c of the parking pole 79 to the outer wall 93 side. Can be formed.

  A return spring support shaft 84 that protrudes toward the partition wall 92 is attached to the overhanging portion 82e, and a torsion spring that moves the parking pole 79 in a direction away from the parking gear 73 is disposed on the outer periphery of the return spring support shaft 84. Thus, since the torsion spring can be accommodated in the transmission case 2A without moving the outer wall 93 of the transmission case 2A radially outward, the automatic transmission 2 can be reduced in size and weight.

  Further, according to the automatic transmission 2 of the present embodiment, the cam 77 that moves the pawl portion 79a of the parking pole 79 in the direction of meshing with the parking gear 73, and the cam support member 81 that faces the parking pole 79 across the cam 77. And the cam 77 is moved between the parking pole 79 and the cam support member 81 while being supported by the cam support member 81, whereby the parking pole 79 is moved to the parking gear 73 side. In addition to this, the cam support member 81 is disposed on the overhanging portion 82 e so as to be adjacent to the return spring support shaft 84.

  As a result, the cam support member 81 is disposed in the overhanging portion 82e so as to be adjacent to the return spring support shaft 84, so that the cam support member 81 can be used as the retainer 82 by efficiently using the space in the transmission case 2A. Can be placed. For this reason, the automatic transmission 2 can be reduced in size and weight.

  While embodiments of the invention have been disclosed, it will be apparent to those skilled in the art that changes may be made without departing from the scope of the invention. All such modifications and equivalents are intended to be included in the following claims.

2 ... automatic transmission, 2A ... transmission case, 5 ... rear case (transmission case), 11 ... output shaft (first shaft), 23 ... counter shaft (second shaft) , 71 ... Parking lock mechanism, 73 ... Parking gear, 77 ... Cam, 79 ... Parking pole, 79a ... Claw part, 79c ... Outer edge part, 81 ... Cam support member 82 ... Retainer, 82b ... Rotating shaft holding portion, 82c ... Fastening hole, 82e ... Overhang portion, 83 ... Parking pole rotating shaft (rotating shaft), 84. .. Return spring support shaft (shaft member), 87 ... Return spring (torsion spring), 92 ... Partition, 92d ... Output shaft through hole (first through hole), 92e ... Counter shaft through Hole (second through hole), 93 ... outer wall, 97a, 97b ... bolt (fastener), 105, 106 ... fastening boss, 107, 108 ... rib, C1 ... tooth Previous circle, L1 ... straight , L2 ... imaginary line, O1 ... center point, O2 ... center point, P1 ... projection point, P2 ... projection point

Claims (3)

A first shaft to which a parking gear is fixed, a second shaft disposed at a position obliquely below and parallel to the first shaft, a parking lock mechanism for restricting rotation of the first shaft, the first shaft, A transmission case that houses the second shaft and the parking lock mechanism;
The transmission case is
An outer wall surrounding the first axis and the second axis in the circumferential direction;
A first through hole through which the first shaft penetrates, a second through hole through which the second shaft penetrates, and a plurality of fastening boss portions are formed in the outer wall so as to be adjacent to the parking gear. And having a partition wall arranged,
The parking lock mechanism is
A pawl portion that meshes with the teeth of the parking gear is formed, and a parking pole that is swingably supported on the rotation shaft;
A rotation shaft holding portion that holds the rotation shaft, and a retainer that is formed with a plurality of fastening holes and is fastened to the fastening boss portion by a fastener that penetrates the fastening hole;
An imaginary line parallel to a straight line passing through the center point of the first through hole and the center point of the second through hole and in contact with the lower half of the tip circle of the parking gear is drawn, and the first line is drawn on the imaginary line. When projecting the center point of one through hole and the center point of the second through hole,
The rotating shaft holding part is disposed so as to intersect the virtual line between the projection point of the center point of the first through hole and the projection point of the center point of the second through hole with respect to the virtual line,
An automatic transmission characterized in that at least one of the plurality of fastening boss portions is disposed between the rotating shaft holding portion and the outer wall in a direction along the imaginary line and connected to the outer wall. Machine. The retainer has a protruding portion extending from the outer edge of the parking pole to the outer wall side,
A shaft member protruding toward the partition wall is attached to the overhanging portion,
The automatic transmission according to claim 1, wherein a torsion spring that moves the parking pole in a direction away from the parking gear is disposed on an outer periphery of the shaft member. A cam that moves the pawl portion of the parking pole in a direction to mesh with the parking gear;
A cam support member facing the parking pole with the cam interposed therebetween,
The parking pawl is moved toward the parking gear by being moved between the parking pawl and the cam support member while being supported by the cam support member,
The automatic transmission according to claim 2, wherein the cam support member is disposed in the projecting portion so as to be adjacent to the shaft member.

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