JP2006183739A - Transmission case structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To engage an oscillating part of an oscillating lever with an annular groove of a reverse idler gear only by rotating the oscillating lever around a fulcrum with the oscillating lever abutting on a rib, to reduce the size of a transmission by eliminating the necessity for enlarging a space between the reverse idler gear and an annular wall of a case member, and to facilitate assembling work. <P>SOLUTION: In this transmission case structure, the reverse idler gear is arranged in the vicinity of a partition wall partitioning inside of a transmission case, and an annular body on which the annular groove is formed is connected with the partition wall side of the reverse idler gear. The oscillating part of the oscillating lever of which fulcrum is fixed to the partition wall is engaged with the annular groove. By oscillating the reverse idler gear by oscillation of the oscillating lever, the reverse gear is engaged with a reverse counter gear. The fulcrum can be rotated around a rotational shaft parallel with a reverse idler shaft. The rib extending from the partition wall toward the annular body and guiding the oscillating part to inside of the annular groove is provided. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a case structure of a transmission, and in particular, a planetary gear, a wet multi-plate clutch, a gear train and a synchronization mechanism similar to a conventional manual transmission in a transmission mechanism, and these are operated using hydraulic pressure, The present invention relates to a case structure of a transmission including an automatic transmission that performs a shifting operation.

The vehicle is provided with a transmission in order to convert the driving force of the engine as required according to the traveling conditions and take it out.
For the transmission, a manual transmission in which the gear clutch is switched by operating the meshing clutch of the switching mechanism with a shift lever operated by the driver, or the gear stage is automatically switched by the driving means according to the driving state. There is an automatic transmission.

  In addition, the automatic transmission is based on a manual transmission having a parallel-shaft gear-type transmission unit composed of a plurality of gear stages, and a shift actuator that is hydraulically operated is added to the manual transmission. There is an automatic transmission in which the meshing clutch is operated to switch the gear stage.

JP-A-7-29352 JP-A-9-264403

  By the way, the transmission case is divided into a plurality of case members, and the case member includes a partition wall that divides the space inside the transmission in the axial direction, and an annular wall that extends in the axial direction from the outer edge of the partition wall. . When the annular wall is lengthened in the axial direction, the joint portion is reduced and the rigidity of the case can be improved, but there is a disadvantage in that it is difficult to assemble parts arranged in the vicinity of the partition wall.

  Workability can be solved by providing an opening in the annular wall so that assembly work can be performed from the outside.However, the number of parts and weight increase, and the assembly man-hours increase and the transmission case increases. There is an inconvenience that the case rigidity increases and the case rigidity decreases.

  Accordingly, in order to eliminate the above-described disadvantages, the present invention provides a partition member that divides the space inside the transmission case in the axial direction, and forms a case member in which an annular wall extending in the axial direction is integrated with the outer edge portion of the partition wall. The case member is provided with a multi-speed transmission mechanism having a forward gear and a reverse gear, and the reverse gear is fixed to the input shaft and the counter shaft, and the reverse gear and the reverse idler shaft are slid on the reverse gear. An annular body comprising a reverse idler gear that is pivotally supported, the reverse idler gear being disposed at a position adjacent to the partition wall, and an annular groove formed on an outer peripheral surface of the reverse idler gear on the partition side , And a rocking portion of a rocking lever whose fulcrum is fixed to the partition wall is engaged with the annular groove, and the reverse idler gear is rocked in the axial direction by rocking the rocking lever. In the case structure of the transmission that is engaged with the reverse gear and the reverse counter gear, the fulcrum can be rotated around a rotation axis parallel to the reverse idler shaft, and A rib extending toward the body and guiding the swinging portion into the annular groove is provided.

  As described in detail above, according to the present invention, the partition that divides the space inside the transmission case in the axial direction is provided, and the case member is formed by integrating the annular wall extending in the axial direction at the outer edge of the partition, A multi-stage transmission mechanism having a forward gear and a reverse gear is provided in the case member, and the reverse gear is fixed to the input shaft and the counter shaft, and the reverse gear and the reverse idler shaft are slidable on the reverse idler shaft. The reverse idler gear is arranged at a position adjacent to the partition wall, and an annular body having an annular groove formed on the outer peripheral surface is connected to the partition side of the reverse idler gear, and the fulcrum is connected to the partition wall. Engage the oscillating part of the fixed oscillating lever with the annular groove and oscillate the reverse idler gear in the axial direction by oscillating the oscillating lever to engage the reverse gear and the reverse counter gear. In the case structure of the transmission, the fulcrum can be rotated around a rotating shaft parallel to the reverse idler shaft, and is extended from the partition wall toward the annular body, and the swinging portion is guided into the annular groove. Since the oscillating lever is provided, the oscillating portion of the oscillating lever can be engaged with the annular groove of the reverse idler gear simply by rotating the oscillating lever around the fulcrum while the oscillating lever is in contact with the rib. The transmission can be reduced in size without the need to increase the gap between the idler gear and the annular wall of the case member, and the assembly work can be facilitated.

  By inventing as described above, in the case structure of the transmission, the fulcrum can be rotated around a rotation shaft parallel to the reverse idler shaft, and extended from the partition wall toward the annular body, so that the swinging portion is annular. When the swing lever is assembled by the rib guided in the groove, the swing portion of the swing lever is simply rotated around the fulcrum while the swing lever is in contact with the rib. It is not necessary to increase the space between the reverse idler gear and the annular wall of the case member by engaging with the annular groove, thereby reducing the size of the transmission and facilitating the assembly work.

  Embodiments of the present invention will be described below in detail with reference to the drawings.

  1 to 5 show an embodiment of the present invention. In FIG. 2, 2 is an engine mounted on a vehicle (not shown), 4 is a crankshaft, and 6 is an automatic transmission (also simply referred to as “transmission”). The automatic transmission 6 includes a first input shaft 10, a second input shaft 12, a counter shaft 14 that is an output shaft, and a reverse idler shaft 16 in a transmission case 8. (1st to 3rd speed) is composed of a planetary gear type transmission unit 18 with little torque loss during shifting, and a high speed stage (3rd to 5th speed) with a small change ratio of the gear ratio is used with a synchronizer with little driving loss. The multi-stage transmission mechanism 20 is configured.

  At this time, as shown in FIG. 2, the transmission case 8 is provided with a partition wall 22 that divides the space inside the transmission case 8 in the axial direction, and an annular wall 24 that extends in the axial direction is formed on the outer edge of the partition wall 22. An integrated case member 26 is formed.

  That is, the transmission case 8 is connected to the first case portion 28 located on the engine 2 side, the case member 26 as the second case portion connected to the first case portion 28, and the case member 26. The third case portion 30 is formed.

  The first input shaft 10 has one end connected to a flywheel (not shown), an oil pump 32 provided in the middle, and a connecting member 34 fixed to the other end. The oil pump 32 is driven by the rotation of the crankshaft 4 to generate hydraulic pressure and supplies it to a valve body (not shown). The second input shaft 12 is disposed on the axial extension on the other end side of the first input shaft 10, and the transmission is provided by the second input shaft bearing 36 disposed in the partition wall 22 and the third case portion 30 of the case member 26. The case 8 is pivotally supported. The counter shaft 14 is disposed in parallel to the first input shaft 10 and the second input shaft 12 and is pivotally supported on the transmission case 8 by a counter shaft bearing 38.

  The planetary gear type transmission unit 18 is disposed between the first input shaft 10 and the second input shaft 12 and transmits the rotation of the first input shaft 10 to the second input shaft 12. The planetary gear type transmission unit 18 is a Simpson type constituted by two rows of first and second planetary gear trains 42 and 44 having a common sun gear 40.

  The first planetary gear train 42 includes a first ring gear 46, a first pinion gear 48, and a first sun gear portion 50 of the sun gear 40. The first ring gear 46 is the other end of the first support member 52 that is rotatable about the second input shaft 12 at the shaft end on the one end side of the second input shaft 12 that faces the other end side of the first input shaft 10. It is fixed on the side. The first pinion gear 48 is rotatably supported by a first carrier 54 fixed to the shaft end on one end side of the second input shaft 12 facing the other end side of the first input shaft 10, and Engage with the ring gear 46. The sun gear 40 is pivotally supported in the vicinity of the end portion on the one end side of the second input shaft 12 and meshes with the first pinion gear 48 on the first sun gear portion 50 provided on the one end side.

  The second planetary gear train 44 includes a second ring gear 56, a second pinion gear 58, and a second sun gear portion 60 of the sun gear 40. The second ring gear 56 is fixed to the outer periphery of the second support member 62 fixed to the second input shaft 12 in the vicinity of the other end of the sun gear 40. The second pinion gear 58 is pivotally supported by a second carrier 64 that can rotate about the second input shaft 12 on the inner periphery of the second ring gear 56, and meshes with the second ring gear 56. The sun gear 40 engages the second pinion gear 58 with a second sun gear portion 60 provided on the other end opposite to the first sun gear portion 50.

  The planetary gear type transmission unit 18 includes a connecting member 34 fixed to one end side of the first support member 52 to which the first ring gear 46 of the first planetary gear train 42 is fixed and the other end side of the first input shaft 10. A frictional start clutch 66 that is hydraulically operated is provided between the outer periphery and the outer periphery.

  The planetary gear type transmission unit 18 faces the outer periphery of the annular member 68 extending radially outward from the outer periphery between the first and second sun gear portions 50 and 60 of the sun gear 40 and the outer periphery of the annular member 68. A friction type band brake 70 that is hydraulically operated is provided between the transmission case 8 and the transmission case 8.

  Further, the planetary gear type transmission unit 18 includes a tip of a cylindrical member 72 extending in the direction of the first support member 52 from the middle of the annular member 68, and an inner periphery of the extension member 74 extending in the radially outward direction from the middle of the first support member 52. In between, a friction type direct clutch 76 operated by hydraulic pressure is provided.

  Furthermore, the planetary gear type transmission unit 18 includes an outer periphery of an annular member 78 extending from the second carrier 64 of the second planetary gear train 44 in the direction of the transmission case 8, and a transmission case 8 facing the outer periphery of the annular member 78. A one-way clutch 80 that prevents rotation in the reverse direction is provided.

  The starting clutch 66, the band brake 70, and the direct clutch 76 constitute a friction engagement element that shifts the planetary gear type transmission unit 18, and includes a starting clutch hydraulic circuit, a band brake hydraulic circuit, and a direct clutch not shown. A hydraulic circuit communicates with a valve body (not shown) constituting a shift control device of the automatic transmission 6.

  For reference, the valve body is disposed in an oil pan attached to the lower part of the transmission case 8, and the oil pump 32 is connected to the hydraulic circuit for pump.

  The speed change control device controls the operation of each control valve built in the valve body by a control means (not shown), and the hydraulic pressure generated by the oil pump 32 is used as a starting clutch 66 and a band brake 70 constituting frictional engagement elements. And the direct clutch 76 to control the operation, and in combination with the one-way clutch 80, the planetary gear type transmission unit 18 is speed-changed from the first speed to the third speed.

  In other words, the planetary gear type transmission unit 18 is shifted to the first gear stage by the coupling of the one-way clutch 80, is shifted to the second gear stage by the coupling of the band brake 70, and is shifted to the third gear stage by the coupling of the direct clutch 76. The speed is changed.

  The rotation of the second input shaft 12 is transmitted to the counter shaft 14 between the second input shaft 12 and the counter shaft 14 on the side farther from the engine 2 than the planetary gear type transmission unit 18. A multi-stage transmission mechanism 20 which is the parallel shaft gear type transmission unit is provided. The multi-speed transmission mechanism 20 includes a third gear stage 82, a fourth gear stage 84, a fifth gear stage 86, and a reverse gear stage 88. The third gear stage 82 to the fifth gear stage 86 are connected to the planetary gear type transmission unit 18. The reverse gear stage 88 is disposed between the third speed gear stage 82 and the fourth speed gear stage 84 in order from the side close to the side to the side away from the side.

  The third speed gear stage 82 includes a second input shaft side third speed gear 90 fixed to the second input shaft 12 and a second input shaft side third speed gear 90 rotatably supported by the counter shaft 14. And a counter shaft side third speed gear 92 that meshes with the gear. The fourth speed gear stage 84 is supported by the second input shaft side fourth speed gear 94 fixed to the second input shaft 12 and the second input shaft side fourth speed gear 94 rotatably supported by the counter shaft 14. It consists of a counter shaft side fourth speed gear 96 that meshes. The fifth speed gear stage 86 is fixed to the second input shaft side fifth speed gear 98 fixed to the second input shaft side fifth speed gear 98 rotatably supported on the second input shaft 12 and the counter shaft 14. It consists of a countershaft side fifth gear 100 that meshes.

  The reverse gear stage 88 is integrated with a second input shaft side reverse gear 102 fixed to the second input shaft 12 and a third speed / fourth speed shift sleeve 116 of a third speed / fourth speed meshing clutch 108 described later. The reverse idler shaft 16 is connected to the reverse idler shaft 16 so as to be engaged with and disengaged from the reverse counter gear 104 which is the counter shaft side reverse gear provided on the second input shaft side and the reverse counter gear 104 which is the counter shaft side reverse gear. It consists of a reverse idler gear 106 that is pivotally supported so as to be freely movable in a direction.

  The counter shaft 14 between the counter shaft side third speed gear 92 and the counter shaft side fourth speed gear 96 is a switching mechanism for switching between the third speed gear stage 82 and the fourth speed gear stage 84. A clutch 108 is provided. The third-speed / four-speed meshing clutch 108 includes a third-speed gear engaging portion 110 provided in the counter shaft side third speed gear 92, a fourth speed gear engaging portion 112 provided in the counter shaft side fourth speed gear 96, A third-speed / four-speed hub 114 fixed to the counter shaft 14 and a third-speed gear engaging portion 110 and a fourth-speed gear are engaged with the third-speed / four-speed hub 114 so as to be axially movable and non-rotatable. And a third-speed / four-speed shift sleeve 116 that is selectively engaged with and disengaged from the engagement portion 112.

  The third-speed / four-speed meshing clutch 108 selectively engages / disengages the third-speed / four-speed shift sleeve 116 with the engagement portion 110 for the third-speed gear and the engagement portion 112 for the fourth-speed gear. The counter shaft side third speed gear 92 and the counter shaft side fourth speed gear 96 are selectively fixed and released with respect to the counter shaft 14 and switched to one of the third speed gear stage 82 and the fourth speed gear stage 84.

  The second input shaft 12 opposite to the second input shaft side fourth speed gear 94 of the second input shaft side fifth speed gear 98 is provided with a fifth speed meshing clutch 118 which is a switching mechanism for switching to the fifth speed gear stage 86. ing. The 5-speed meshing clutch 118 includes a 5-speed gear engaging portion 120 provided on the second input shaft side 5-speed gear 98, a 5-speed hub 122 fixed to the second input shaft 12, and the 5-speed hub 122. And a 5-speed shift sleeve 124 engaged with and disengaged from the 5-speed gear engaging portion 120 by being axially movable and non-rotatable.

  Further, the fifth-speed meshing clutch 118 engages and disengages the fifth-speed shift sleeve 124 with the fifth-speed gear engaging portion 120, thereby causing the second input shaft side fifth-speed gear 98 to move relative to the second input shaft 12. Then, fix and release, and switch to the fifth gear stage 86.

  The reverse idler gear 106 is provided with a reverse switching mechanism 126. The reverse switching mechanism 126 is provided with a reverse shift sleeve 128 on the reverse idler gear 106.

  The reverse switching mechanism 126 moves the reverse idler gear 106 in the axial direction of the reverse idler shaft 16 by the reverse shift sleeve 128 and meshes with the second input shaft side reverse gear 102 and the reverse counter gear 104 that is the counter shaft side reverse gear.・ Switch to reverse gear stage 88 by disengaging.

  The third-speed / four-speed shift sleeve 116 of the third-speed / four-speed meshing clutch 108, the fifth-speed shift sleeve 124 of the fifth-speed meshing clutch 118, and the reverse shift sleeve 128 of the reverse switching mechanism 126 are a three-speed / four-speed transmission mechanism. A shift actuator (not shown) is communicated via a 130, a 5-speed transmission mechanism 132, and a reverse transmission mechanism 134.

  As shown in FIG. 3, the third-speed / four-speed transmission mechanism 130 includes a third-speed / four-speed shift fork 136 engaged with the third-speed / four-speed shift sleeve 116, and the third-speed / four-speed shift fork 136. A third speed / fourth speed shift shaft 138 that is fixed and supported by the transmission case 8 so as to be movable in the axial direction of the counter shaft 14, and the third speed / fourth speed shift shaft 138 is moved in the axial direction of the counter shaft 14. And a 3-speed / 4-speed shift yoke 140.

  The 5-speed transmission mechanism 132 includes a 5-speed shift fork 142 that is engaged with a 5-speed shift sleeve 124, and the 5-speed shift fork 142 that is fixed to the 3-speed and 4-speed shift shaft 138 in the axial direction. A fifth speed shift shaft 144 supported by the transmission case 8 and the fifth speed shift shaft 144 are translated in the axial direction of the third speed / fourth speed shift shaft 138 and are moved to the third speed / fourth speed shift yoke 140. It consists of a 5-speed / reverse shift yoke 146 arranged adjacently.

  The reverse transmission mechanism 134 includes a swing lever (also referred to as “reverse lever”) 148 that is engaged with the reverse shift sleeve 128.

  2, the automatic transmission 8 is provided with a final reduction drive gear 150 at the end of the counter shaft 14 on the engine 2 side, and a final reduction driven gear 152 that meshes with the final reduction drive gear 150 is provided as a differential 154. It is attached to. The differential 154 is provided in communication with one end side of the left and right drive axles 156 and 158. The drive axles 156 and 158 are pivotally supported on the transmission case 8 by left and right axle bearings 160 and 162, and the other end side is provided in contact with left and right drive wheels (not shown).

  Further, the multi-stage speed change mechanism 20 is configured such that the reverse gear is fixed to the second input shaft 12 and the counter shaft 14 respectively, and a reverse counter gear 104 that is a counter shaft-side reverse gear. And a reverse idler gear 106 slidably supported on the reverse idler shaft 16, the reverse idler gear 106 is disposed at a position adjacent to the partition wall 22, and the reverse idler gear 106 An annular body 166 having an annular groove 164 formed on the outer peripheral surface is connected to the partition wall 22 side, and a swinging portion 170 of the swing lever 148 having a fulcrum 168 fixed to the partition wall 22 is engaged with the annular groove 164. The reverse idler gear 106 is swung in the axial direction by the swing of the swing lever 148, and the second input shaft side reverse gear 1 is swung. 2 to be the counter shaft side reverse gear and so as to engage the reverse counter gear 104.

  The fulcrum 168 can be rotated around a rotation axis parallel to the reverse idler shaft 16, and is extended from the partition wall 22 toward the annular body 166, and the swinging portion 170 is connected to the annular groove 164. It is set as the structure which provides the rib 172 guided in.

  More specifically, as shown in FIG. 3, the swing lever 148 fixes the fulcrum 168 on one end side to the partition wall 22 by a fixing member 174 made of a fixing bolt, as shown in FIGS. 4 (a) and 4 (b). As shown, the center of rotation of the swing lever 148 is the fulcrum 168, and the other end of the swing lever 148 is swingable in the axial direction (the swing direction in FIG. 4A and the vertical direction in FIG. 4B). The reverse idler gear 106 is slidable in the axial direction (sliding direction in the vertical direction in FIG. 4B).

  The fixing member 174 is a rotating shaft parallel to the reverse idler shaft 16.

  When the swing lever 148 is assembled, as shown in FIG. 5, the swing lever 148 is temporarily fixed to the partition wall 22 by a single fixing member 174, and the fulcrum 168 is parallel to the reverse idler shaft 16. It is possible to rotate around a fixed member 174 which is a rotating shaft (refer to the rotation direction A in the vertical direction in FIG. 1 and the rotation direction A in FIG. 5).

  Further, the reverse idler shaft 16 supported by the shaft support portion 176 provided in the partition wall 22 of the case member 26 is provided, and the reverse idler gear 106 provided on the reverse idler shaft 16 is provided as shown in FIG. A flange-shaped annular body 166 is connected to the shaft support portion 176 side, and an annular groove 164 is formed between the reverse idler gear 106 and the annular body 166.

  As shown in FIG. 1, a rib 172 is extended from the partition wall 22 toward the annular body 166 at the outer peripheral portion of the shaft support portion 176, and the rib 172 and the reverse idler gear 106 are used to As shown in the rotation direction A, which is the vertical direction of, the swinging portion 170 of the swinging lever 148 is guided into the annular groove 164.

  In addition, in the assembly of the automatic transmission 6, as shown in FIG. 2, the reverse idler gear 106 is installed in the vicinity of the partition wall 22 of the case member 26, and the case member 26 and the third case as the second case portion. It is in a deep position from the mating surface with the part 30.

  Further, as shown in FIGS. 4A and 4B, when assembling the reverse idler gear 106, it is necessary to put a hand deeply, and the second input shaft 12 and the counter shaft 14 as the output shaft are assembled. In some situations, workability is poor.

  Further, as shown in FIGS. 2 and 3, a multi-stage transmission mechanism 20 having a forward gear and a reverse gear, which is a parallel shaft gear transmission, is arranged in the case member 26, which is the second case portion, so that the opening portion is formed. Because it is small and has a minimum size, a work space for holding both hands is not secured.

  Therefore, the rib 172 is added to the case member 26 as the second case portion to cope with it.

  Next, the operation will be described.

  Before assembling the second input shaft 12 and the counter shaft 14 as an output shaft, the swing lever 148 is assembled.

  That is, in the case member 26 that is the second case portion, as shown in FIG. 5, the swing lever 148 is temporarily fixed to the partition wall 22 by one fixing member 174, and the fulcrum 168 is parallel to the reverse idler shaft 16. It is possible to rotate around the fixed member 174 that is a rotating shaft, that is, to rotate in the rotational direction A that is the vertical direction in FIG. 1 and the rotational direction A in FIG.

  Thereafter, gear shafts and forks such as the second input shaft 12 and the counter shaft 14 as the output shaft are assembled in the case member 26 as the second case portion.

  Further, the swing lever 148 is set to the initial position, that is, the position indicated by the solid line in FIG. 1 and the position indicated by the two-dot chain line in FIG. Assemble in position.

  1, the swinging portion 170 of the swinging lever 148 is positioned between the reverse idler gear 106 and the rib 172 so that the fulcrum 168 rotates around the fixing member 174. The swing lever 148 is rotated, that is, rotated clockwise in FIG. 5 (see the broken line portion in FIG. 5).

  At this time, with the rotation of the swing lever 148, the swinging portion 170 of the swing lever 148 slides along the rib 172 between the reverse idler gear 106 and the rib 172, and the reverse idler gear 106 and the annular body. 166 is guided by an annular groove 164 formed between the oscillating member 166 and the oscillating portion 170 of the oscillating lever 148 engages with the annular groove 164 as indicated by a one-dot chain line in FIG.

  Thereafter, the swing lever 148 is fixed by another fixing member 174.

  A reverse idler gear 106 is disposed in the vicinity of the partition wall 22 of the case member 26 configured as described above, and a swing lever 148 for sliding the reverse idler gear 106 is provided between the partition wall 22 and the reverse idler gear 106. Then, in order to engage the swing portion 170 of the swing lever 148 with the annular groove 164 of the reverse idler gear 106, the operator's hand is inserted between the reverse idler gear 106 and the annular wall 24 of the case member 26. It is necessary to secure a space that can be created, and the transmission is enlarged, and the work position is not visible.

  In the embodiment of the present invention, the fulcrum 168 of the swing lever 148 can be rotated around a fixed member 174 that is a rotation axis parallel to the reverse idler shaft 16 and from the partition wall 22 toward the annular body 166. Since the rib 172 that extends and guides the rocking portion 170 into the annular groove 164 is provided, the rocking lever 148 can be simply rotated by rotating it around the fulcrum 168 while the rocking lever 148 is in contact with the rib 172. The swinging portion 170 can be engaged with the annular groove 164 of the reverse idler gear 106, and the transmission can be reduced in size without the need to increase the space between the reverse idler gear 106 and the annular wall 24 of the case member 26. Assembling work can be facilitated.

  Further, a fixing member 174 for fixing the fulcrum 168 to the partition wall 22 is provided, and the fixing member 174 serves as a rotation axis parallel to the reverse idler shaft 16 so that the fixing member 174 of the fulcrum 168 also serves as the rotation axis. Thus, the fulcrum 168 can be reduced in size and the structure can be simplified.

It is an expanded sectional view by the II line of FIG. 5 which shows the Example of this invention. It is a schematic layout diagram of a transmission. It is a schematic explanatory drawing of the state which looked at the case member which is a 2nd case part from the mating surface side with a 3rd case part. (A) is a schematic enlarged view of the swing lever as viewed from the direction of the arrow IV (a) in FIG. 3, and (b) is a diagram showing the swing lever engaged with the annular groove of the reverse idler gear. FIG. 5 is a schematic enlarged cross-sectional view of a state where the reverse idler gear is slid. It is explanatory drawing which shows the state which attaches a rocking lever in the case member which is a 2nd case part.

Explanation of symbols

2 Engine 4 Crankshaft 6 Automatic transmission (also simply called “transmission”)
DESCRIPTION OF SYMBOLS 8 Transmission case 10 1st input shaft 12 2nd input shaft 14 Counter shaft 16 Reverse idler shaft 18 Planetary gear type transmission part 20 Multistage transmission mechanism 22 Partition 24 Ring wall 26 Case member 28 1st case part 30 3rd case part 32 Oil pump 42 First planetary gear train 44 Second planetary gear train 66 Start clutch 70 Band brake 76 Direct clutch 80 One-way clutch 82 Third gear stage 84 Fourth gear stage 86 Five speed gear stage 88 Reverse gear stage 102 Second input shaft Reverse gear 104 Reverse counter gear 106 which is a counter shaft side reverse gear Reverse idler gear 108 Third speed / fourth speed meshing clutch 118 Five speed meshing clutch 126 Reverse switching mechanism 130 Third speed / fourth speed transmission mechanism 132 Five speed transmission mechanism 134 Reverse Transmission mechanism 148 Swing lever -(Also called "reverse lever")
154 Differential 164 Annular groove 166 Annular body 168 Support point 170 Swing part 172 Rib 174 Fixing member 176 Shaft support part

Claims (2)

  A partition that divides the space inside the transmission case in the axial direction is provided, and a case member is formed by integrating an annular wall extending in the axial direction at the outer edge of the partition, and a forward gear and a reverse gear are formed in the case member. The reverse gear is composed of a reverse gear and a reverse counter gear fixed to the input shaft and the counter shaft, respectively, and a reverse idler gear that is slidably supported on the reverse idler shaft. The reverse idler gear is disposed at a position adjacent to the partition wall, and an annular body having an annular groove formed on the outer peripheral surface is connected to the partition side of the reverse idler gear so that a fulcrum is fixed to the partition wall. A lever swinging portion is engaged with the annular groove, and the reverse idler gear is swung in the axial direction by swinging the swinging lever so that the reverse gear and the reverse counter gear are swung. In the case structure of the transmission that is engaged with the reverse idler shaft, the fulcrum can be rotated around a rotation shaft that is parallel to the reverse idler shaft, and is extended from the partition wall toward the annular body. A transmission case structure comprising a rib for guiding a moving portion into the annular groove.   The transmission case structure according to claim 1, wherein a fixing member for fixing the fulcrum to the partition is provided, and the fixing member is used as the rotating shaft.

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