JP4636430B2 - Shift control device for automatic transmission - Google Patents

Description

  The present invention relates to a shift control device for an automatic transmission, and in particular, it is possible to eliminate the need to provide an oil pump for a shift actuator and a hydraulic pipe that communicates between the oil pump and the shift actuator outside the transmission case. In addition, the present invention relates to a shift control device for an automatic transmission that can simplify the structure of the automatic transmission by integrating a shift actuator into a valve body that controls a friction engagement element.

  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.

In an automatic transmission based on a manual transmission having a conventional parallel-shaft gear type transmission, a shift actuator that performs a hydraulic shift operation is externally attached to the transmission case of an existing manual transmission. There is also a type in which the hydraulic pressure from the oil pump is adjusted / distributed by an external hydraulic pipe or the like to operate the shift actuator to change speed.
Japanese Patent Laid-Open No. 11-22816

On the other hand, in the automatic transmission based on the manual transmission having the parallel shaft gear type transmission unit as described above, it is necessary to disconnect the driving force when the meshing clutch is operated, which causes a problem that the acceleration force is interrupted. In order to improve, the planetary gear type transmission unit that can change the speed without cutting the driving force is combined with the parallel shaft gear type transmission unit, and the planetary gear type transmission unit is capable of shifting between the first speed to the third speed with a large driving force. There is something to do.
JP 2003-287091 A

  However, in the automatic transmission disclosed in Patent Document 1, since the shift actuator is mounted outside the transmission case, an oil pump that supplies hydraulic pressure to the shift actuator and communication between the oil pump and the shift actuator are communicated. It is necessary to dispose hydraulic piping or the like outside the transmission case, and it is necessary to consider hydraulic seals associated therewith. As a result, the automatic transmission disclosed in Patent Document 1 has a problem that the structure is complicated, the number of parts is increased, the degree of freedom in design is reduced, and the assembling property is deteriorated.

  On the other hand, the automatic transmission disclosed in Patent Document 2 includes a valve body for hydraulic control for shifting operation of the planetary gear type transmission unit, and in addition, a meshing clutch of the parallel shaft gear type transmission unit is provided. If the shift actuator to be operated is externally attached, there is a problem that the speed change control device is further complicated.

According to the present invention, a planetary gear type transmission unit that is operated to change speed by a friction engagement element, and a gear actuator that is connected to the planetary gear type transmission unit and that is operated by hydraulic pressure, operates a meshing clutch to switch gear stages. In a shift control device for an automatic transmission in which a parallel shaft gear-type transmission unit and a valve body that controls the friction engagement element are housed in a transmission case, the shift actuator is mounted on the valve body. A hydraulic circuit for operating the shift actuator is formed in the valve body. The shift actuator is provided with a shift and select lever that engages with a shift yoke on the outer periphery, and moves in the axial direction and rotates about the axis. A shift-and-select shaft is provided, and the valve body is attached to the lower part of the transmission case. A pair of support portions projecting upward from the upper surface of the valve body and forming a recess recessed between the support portions inside the upper surface of the valve body, The shift and select shaft is supported by the support portion in a state of being exposed upward from the upper surface of the valve body, and the lower portion of the shift and select lever is accommodated in the recess .

The shift control device for an automatic transmission according to the present invention eliminates the need to provide an oil pump for a shift actuator and a hydraulic pipe that communicates between the oil pump and the shift actuator on the outside of the transmission case. The structure of the automatic transmission can be simplified by integrating the shift actuator into the valve body that controls the engagement element.

The shift control device for an automatic transmission according to the present invention eliminates the need for providing hydraulic piping or the like outside the transmission case, and can simplify the structure of the automatic transmission by integrating a shift actuator into the valve body. is there.
Embodiments of the present invention will be described below based on the drawings.

  1 to 10 show an embodiment of the present invention. In FIG. 9, 2 is an engine mounted on a vehicle (not shown), 4 is a crankshaft, 6 is a flywheel with a damper, and 8 is an automatic transmission. The automatic transmission 8 includes a first input shaft 12, a second input shaft 14, an output shaft 16, a reverse idler shaft 18, a planetary gear type transmission unit 20, and a parallel shaft gear type transmission unit 22 in a transmission case 10. The oil pan 24 is attached to the lower part of the transmission case 10.

  One end of the first input shaft 12 is connected to the flywheel 6 with a damper, an oil pump 26 is provided in the middle, and a connecting member 28 is fixed to the other end. The oil pump 26 is driven by the rotation of the crankshaft 4 to generate hydraulic pressure, and supplies it to a valve body 86 described later. The second input shaft 14 is disposed on an extension of the axis on the other end side of the first input shaft 12, and is supported by the transmission case 10 by a second input shaft bearing 30. The output shaft 16 is disposed in parallel to the first input shaft 12 and the second input shaft 14, and is supported on the transmission case 10 by an output shaft bearing 32.

  The planetary gear type transmission unit 20 is disposed between the first input shaft 12 and the second input shaft 14 and transmits the rotation of the first input shaft 12 to the second input shaft 14. The planetary gear type transmission unit 20 is a Simpson type constituted by two rows of first and second planetary gear trains 36 and 38 having a common sun gear 34.

  The first planetary gear train 36 includes a first ring gear 40, a first pinion gear 42, and a first sun gear portion 44 of the sun gear 34. The first ring gear 40 is the other end of the first support member 46 that is rotatable around the second input shaft 14 at the shaft end on the one end side of the second input shaft 14 that faces the other end side of the first input shaft 12. It is fixed on the side. The first pinion gear 42 is rotatably supported by a first carrier 48 fixed to a shaft end on one end side of the second input shaft 14 facing the other end side of the first input shaft 12, and Engage with the ring gear 40. The sun gear 34 is pivotally supported in the vicinity of an end portion on one end side of the second input shaft 14, and meshes with the first pinion gear 42 at a first sun gear portion 44 provided on one end side.

  The second planetary gear train 38 includes a second ring gear 50, a second pinion gear 52, and a second sun gear portion 54 of the sun gear 34. The second ring gear 50 is provided on the outer periphery of the second support member 56 fixed to the second input shaft 14 in the vicinity of the other end side of the sun gear 34. The second pinion gear 52 is pivotally supported by a second carrier 58 that can rotate about the second input shaft 14 on the inner periphery of the second ring gear 50, and meshes with the second ring gear 50. The sun gear 34 meshes with the second pinion gear 52 at a second sun gear portion 54 provided on the other end side opposite to the first sun gear portion 44.

  The planetary gear type transmission unit 20 includes an outer periphery of a connecting member 28 fixed to one end side of the first support member 46 to which the first ring gear 40 of the first planetary gear train 36 is fixed and the other end side of the first input shaft 12. Between them, a frictional start clutch 60 that is hydraulically operated is provided. Further, the planetary gear type transmission unit 20 is configured so that the outer periphery of the annular member 62 extending radially outward from the outer periphery between the first and second sun gear units 44 and 54 of the sun gear 34 and the outer periphery of the annular member 62 are opposed to each other. A friction type band brake 64 that is hydraulically operated is provided between the machine case 10 and the machine case 10.

  Further, the planetary gear type transmission unit 20 includes a tip of a cylindrical member 66 extending in the direction of the first support member 46 from the middle of the annular member 62, and an inner periphery of the extension member 68 extending in the radially outward direction from the middle of the first support member 46. A friction type direct clutch 70 that is hydraulically operated is provided therebetween. Furthermore, the planetary gear type transmission unit 20 includes an outer periphery of an annular member 72 extending from the second carrier 58 of the second planetary gear train 38 toward the transmission case 10 and a transmission case 10 facing the outer periphery of the annular member 72. A one-way clutch 74 that prevents rotation in the reverse direction is provided therebetween.

  The starting clutch 60, the band brake 64, and the direct clutch 70 constitute a friction engagement element 76 for shifting the planetary gear transmission 20, and the starting clutch hydraulic circuit 78, the band brake hydraulic circuit 80, and the direct clutch. The hydraulic circuit 82 is connected to a valve body 86 constituting a shift control device 84 of the automatic transmission 8. The valve body 86 is disposed in the oil pan 24 attached to the lower portion of the transmission case 10, and the oil pump 26 is connected to the pump hydraulic circuit 88.

  The valve body 86 supplies and discharges the hydraulic pressure generated by the oil pump 26 to and from the start clutch 60, the band brake 64, and the direct clutch 70 through the hydraulic circuits 78 to 82, and the start clutch control valve 90 and the band brake. A control valve 92 and a direct clutch control valve 94 are incorporated.

  The speed change control device 84 controls the operation of the control valves 90 to 94 built in the valve body 86 by a control means (not shown), and the hydraulic pressure generated by the oil pump 26 is used as a starting clutch that constitutes the friction engagement element 76. 60, the band brake 64, and the direct clutch 70 are supplied and discharged to control the operation. As shown in FIG. 10, the planetary gear type transmission unit 20 is moved between the first speed to the third speed in combination with the one-way clutch 74. Change gears.

  In other words, the planetary gear type transmission unit 20 is shifted to the first gear stage by coupling the one-way clutch 74, is shifted to the second gear stage by coupling the band brake 64, and the third gear stage by coupling the direct clutch 70. The speed is changed.

  The planetary gear type transmission unit 20 is located on the side farther from the engine 2 and between the second input shaft 14 and the output shaft 16, the rotation of the second input shaft 14 is transmitted to the output shaft 16. A shaft gear type transmission unit 22 is provided. The parallel shaft gear type transmission unit 22 includes a third speed gear stage 96, a fourth speed gear stage 98, a fifth speed gear stage 100, and a reverse gear stage 102. The third speed gear stage 96 to the fifth speed gear stage 100 are connected to a planetary gear type. A reverse gear stage 102 is disposed between the third speed gear stage 96 and the fourth speed gear stage 98 in order from the side closer to the transmission unit 20 toward the side away from the transmission unit 20.

  The third speed gear stage 96 is supported by a second input shaft side third speed gear 104 fixed to the second input shaft 14 and a second input shaft side third speed gear 104 rotatably supported by the output shaft 16. It comprises an output shaft side third gear 106 that meshes. The fourth speed gear stage 98 is supported by the second input shaft side fourth speed gear 108 rotatably supported by the second input shaft side fourth speed gear 108 fixed to the second input shaft 14 and the output shaft 16. It comprises an output shaft side fourth gear 110 that meshes. The fifth speed gear stage 100 includes a second input shaft side fifth speed gear 112 rotatably supported on the second input shaft 14 and a second input shaft side fifth speed gear 112 fixed to the output shaft 16. It comprises an output shaft side fifth gear 114 that meshes.

  The reverse gear stage 102 is provided integrally with a second input shaft-side reverse gear 116 fixed to the second input shaft 14 and a third-speed / four-speed shift sleeve 130 of a third-speed / four-speed meshing clutch 122 described later. A reverse idler shaft 18 is axially movable and pivotally supported so as to be engaged and disengaged with the output shaft side reverse gear 118, the second input shaft side reverse gear 116, and the output shaft side reverse gear 118. It consists of an idler gear 120.

  The output shaft 16 between the output shaft side third speed gear 106 and the output shaft side fourth speed gear 110 is a three-speed / four-speed meshing clutch that is a switching mechanism for switching between the third speed gear stage 96 and the fourth speed gear stage 98. 122 is provided. The third-speed / four-speed meshing clutch 122 includes a third-speed gear engaging portion 124 provided in the output shaft side third speed gear 106, a fourth speed gear engaging portion 126 provided in the output shaft side fourth speed gear 110, A third-speed / four-speed hub 128 fixed to the output shaft 16 and a third-speed gear engaging portion 124 and a fourth-speed gear are engaged with the third-speed / four-speed hub 128 so as to be axially movable and non-rotatable. And a third-speed / four-speed shift sleeve 130 that is selectively engaged / disengaged with the engagement portion 126.

  The third-speed / four-speed meshing clutch 122 selectively engages / disengages the third-speed / four-speed shift sleeve 130 with the engagement portion 124 for the third-speed gear and the engagement portion 126 for the fourth-speed gear. The side third speed gear 106 and the output shaft side fourth speed gear 110 are selectively fixed to and released from the output shaft 16 and switched to one of the third speed gear stage 96 and the fourth speed gear stage 98.

  The second input shaft 14 opposite to the second input shaft side fourth speed gear 108 of the second input shaft side fifth speed gear 112 is provided with a fifth speed meshing clutch 132 that is a switching mechanism for switching to the fifth speed gear stage 100. Yes. The 5-speed meshing clutch 132 includes a 5-speed gear engaging portion 134 provided on the second input shaft side 5-speed gear 112, a 5-speed hub 136 fixed to the second input shaft 14, and the 5-speed hub 136. And a 5-speed shift sleeve 138 engaged with and disengaged from the 5-speed gear engaging portion 134 by being axially movable and non-rotatable.

  The fifth speed meshing clutch 132 fixes the second input shaft side fifth speed gear 112 to the second input shaft 14 by engaging / disengaging the fifth speed shift sleeve 138 to / from the fifth speed gear engaging portion 134. Release and switch to 5th gear stage 100.

  The reverse idler gear 120 is provided with a reverse switching mechanism 140. The reverse switching mechanism 140 includes a reverse shift sleeve 142 in the reverse idler gear 120.

  The reverse switching mechanism 140 moves the reverse idler gear 120 in the axial direction of the reverse idler shaft 18 by the reverse shift sleeve 142, and engages and disengages the second input shaft side reverse gear 116 and the output shaft side reverse gear 118. Switch to reverse gear stage 102.

  The third-speed / four-speed shift sleeve 130 of the third-speed / four-speed meshing clutch 122, the fifth-speed shift sleeve 138 of the fifth-speed meshing clutch 132, and the reverse shift sleeve 142 of the reverse switching mechanism 140 are the third-speed / four-speed transmission mechanism 144. And a fifth speed transmission mechanism 146 and a reverse transmission mechanism 148 are connected to the shift actuator 150.

  As shown in FIGS. 1 and 2, the third-speed / four-speed transmission mechanism 144 includes a third-speed / four-speed shift fork 152 engaged with the third-speed / four-speed shift sleeve 130, and the third-speed / four-speed shift fork. The third speed / fourth speed shift shaft 154 is supported by the transmission case 10 so as to be movable in the axial direction of the output shaft 16 and the third speed / fourth speed shift shaft 154 is connected to the axial direction of the output shaft 16. And a third-speed / four-speed shift yoke 156 to be moved.

  A 5-speed transmission mechanism 146 is engaged with a 5-speed shift fork 158 engaged with a 5-speed shift sleeve 138, and the 5-speed shift fork 158 is fixed and can be translated in the axial direction of the 3-speed and 4-speed shift shaft 154. The 5-speed shift shaft 160 supported by the transmission case 10 and the 5-speed shift shaft 160 are translated in the axial direction of the 3-speed / 4-speed shift shaft 154 and adjacent to the 3-speed / 4-speed shift yoke 156. And a 5-speed / reverse shift yoke 162.

  The reverse speed change mechanism 148 includes a reverse shift arm 164 engaged with the reverse shift sleeve 142, and the reverse shift fork 164 fixed thereto and connected to the fifth speed shift shaft 160 so as to be axially connected to the fifth speed shift shaft 160. And a reverse shift shaft 166 supported by the transmission case 10 so as to be able to move together.

  The shift actuator 150 is attached to the valve body 86. As shown in FIGS. 3 and 4, the shift actuator 150 is moved in the axial direction and rotated around the shaft, and the shift and select shaft 168 is attached to the shift and select shaft 168 so that the third speed and the fourth speed are mounted. A shift and select lever 170 that is selectively engaged with the shift yoke 156 and the fifth speed / reverse shift yoke 162 is provided. The valve body 86 is provided with support portions 172 and 174 that are disposed so as to sandwich the shift and select lever 170 and support both sides of the shift and select shaft 168 in an axially movable and rotatable manner.

  As shown in FIGS. 5 to 8, the shift and select shaft 168 is provided with a malfunction prevention interlock plate 176 formed in a substantially C shape so as to sandwich the shift and select lever 170 from both sides. It is installed so that it can move. The interlock plate 176 is provided with a guide gap 178 on one end side and a restriction hole 180 on the other end side. The interlock plate 176 is restricted from moving in the axial direction and the circumferential direction with respect to the shift and select shaft 168 by engaging a restriction member 182 attached to the valve body 86 with the restriction hole 180.

  The shift-and-select lever 170 is provided with a base 184 fixed to a shift-and-select shaft 168 with a fixing bolt 186, and protrudes from one end side of the guide gap 178 of the interlock plate 176 so that the third-speed / four-speed shift yoke 156 and A lever portion 188 that is selectively engaged with the fifth-speed / reverse shift yoke 162 is provided, and a restriction portion 190 that faces the restriction hole 180 of the interlock plate 176 is provided on the other end side. A restriction groove 192 is provided in the restriction portion 190. The shift and select lever 170 restricts the select operation and the shift operation to a predetermined value by engaging the tip of the restricting member 182 with the restricting groove 192.

  The valve body 86 is provided with a recess 194 for accommodating the base 184 of the shift and select lever 170 fixed to the shift and select shaft 168 between the support portions 172 and 174.

  A positioning mechanism 196 is provided between the base 184 of the shift and select lever 170 and the interlock plate 176. The positioning mechanism 196 is provided by mounting a pair of balls 202 pressed by the spring 200 in the mounting hole 198 of the base 184, and the balls 202 are pressed and engaged with the interlock plate 176 corresponding to the neutral position and each shift position. The positioning hole 204 is formed and provided. In the positioning mechanism 196, the ball 202 is elastically engaged with the corresponding positioning holes 204 at the time of neutral and at each shift, and positioning is performed while preventing the shift and select lever 170 from moving freely.

  The shift and select shaft 168 is provided with a return spring 206 mounted between one support portion 172 and the interlock plate 176. One end side of the return spring 206 is pressed against the contact body 208 on the interlock plate 176 side, and the other end side is pressed against the contact body 210 on the support portion 172 side. The contact body 208 on one end side is contacted and supported by a fixed member 212 fixed to the shift and select shaft 168 on the interlock plate 176 side. The abutting body 210 on the other end side is abutted and supported by a fixing member 214 fixed to the shift and select shaft 168 on the support portion 172 side, and is also abutted and supported by one support portion 172.

  The shift and select shaft 168 is provided with a select piston 216 formed at the tip of the other end inserted into the support hole 174 a of the other support portion 174. The valve body 86 is provided with a selection cylinder 218 that is continuous with the support hole 174a of the other support portion 174 and accommodates the selection piston 216 so as to be movable in the axial direction. The valve body 86 is provided with a selection hydraulic circuit 220 that communicates with the selection cylinder 218 on the distal end side of the selection piston 216, and a selection control valve (not shown) for controlling the hydraulic pressure of the selection hydraulic circuit 220 is provided. Built in.

  When the hydraulic pressure is supplied to the select cylinder 218, the shift and select shaft 168 is pushed to the select piston 216 to be moved to the fifth speed / reverse select position on the one side in the axial direction, and the return spring 206 is compressed. The When the hydraulic pressure is discharged from the selection cylinder 218, the shift and select shaft 168 is returned to the neutral position on the other side in the axial direction by the spring force of the compressed return spring 206.

  Further, the shift and select shaft 168 is provided with a rotation lever 222 fixed by a fixing bolt 224 on one end side protruding from the support hole 172 a of one support portion 172. The valve body 86 is provided with an accommodating portion 226 that accommodates the rotation lever 222 outside the one support portion 172 and allows the rotation.

  A pair of shift cylinders 228 and 230 are formed in the valve body 86 so as to face each other from both sides in the rotation direction of the rotation lever 222 in the accommodating portion 226. In each of the shift cylinders 228 and 230, shift pistons 232 and 234 that are brought into contact with the rotation lever 222 at the front end side and give a rotational force are accommodated so as to be movable in the axial direction. The shift pistons 232 and 234 are arranged at positions on one side in the axial direction adjacent to the recess 194 around the shift and select shaft 168. The valve body 86 is provided with shift hydraulic circuits 236 and 238 that communicate with the shift cylinders 228 and 230 on the rear end sides of the shift pistons 232 and 234, respectively, and the hydraulic pressures of the shift hydraulic circuits 236 and 238 are provided. It incorporates a shift control valve (not shown) for controlling the motor.

  When the hydraulic pressure is supplied to one shift cylinder 228 and the hydraulic pressure is discharged from the other shift cylinder 230, the shift and select shaft 168 pushes one shift piston 232 to move the shaft 3 on one side around the shaft. The shift operation is performed to the fast shift position or the fifth shift position. Further, when the hydraulic pressure is supplied to the other shift cylinder 230 and the hydraulic pressure is discharged from one shift cylinder 228, the shift and select shaft 168 pushes the other shift piston 234 and moves to the other side around the axis. Shifting to the 4th gear shift position or reverse shift position is performed.

  The shift control device 84 controls the shift control valve and the select control valve built in the valve body 86 by control means (not shown), and shifts the hydraulic pressure generated by the oil pump 26 to the select hydraulic circuit 220 and shifts. The hydraulic cylinders 236 and 238 are supplied to and discharged from the selection cylinder 218 and the shift cylinders 228 and 230 to control the operation of the selection piston 216 and the shift pistons 232 and 234. As shown in FIG. The gear-type transmission unit 22 is shifted between the 3rd speed and the 5th speed and reverse.

  That is, the parallel-shaft gear-type transmission unit 22 is driven by the shift actuator 150 operated by the oil pressure of the oil pump 26 via the third speed / fourth speed transmission mechanism 144, the fifth speed transmission mechanism 146, and the reverse transmission mechanism 148. The fourth speed meshing clutch 122, the fifth speed meshing clutch 132, and the reverse switching mechanism 140 are operated to switch the third speed gear stage 96, the fourth speed gear stage 98, the fifth speed gear stage 100, and the reverse gear stage 102.

  Further, as shown in FIG. 9, the automatic transmission 8 is provided with a final reduction drive gear 240 at the end of the output shaft 16 on the engine 2 side, and a final reduction driven gear 242 that meshes with the final reduction drive gear 240 is provided as a differential 244. It is attached to. The differential 244 is provided in communication with one end side of the left and right drive axles 246 and 248. The drive axles 246 and 248 are pivotally supported on the transmission case 10 by left and right axle bearings 250 and 252, and the other end side is provided in contact with left and right drive wheels (not shown).

  Next, the operation of this embodiment will be described.

  The shift control device 84 of the automatic transmission 8 operates by supplying and discharging the hydraulic pressure generated by the oil pump 26 to and from the start clutch 60, the band brake 64, and the direct clutch 70 that are the friction engagement elements 76 by the valve body 86. And the planetary gear type transmission unit 20 is operated to change the speed from the first speed to the third speed.

  The shift control device 84 of the automatic transmission 8 supplies and discharges the hydraulic pressure generated by the oil pump 26 by the valve body 86 to and from the selection cylinder 218 and the shift cylinders 228 and 230 of the shift actuator 150. 216 and shift pistons 232 and 234 are controlled, and the third-speed / four-speed meshing clutch 122, the fifth-speed meshing clutch 132, and the reverse switching mechanism 140 are used to change the parallel-shaft gear transmission 22 from the third speed to the fifth speed. Shift between and reverse.

  The shift control device 84 of the automatic transmission 8 includes a planetary gear type transmission unit 20 that is operated to change speed by a friction engagement element 76, and a shift actuator that is connected to the planetary gear type transmission unit 20 and operated by hydraulic pressure. The parallel-shaft gear type transmission unit 22 is configured to operate the third-speed / four-speed meshing clutch 122 and the fifth-speed meshing clutch 132 at 150 to switch between the third speed gear stage 96 to the fifth speed gear stage 100; A valve body 86 for controlling the transmission is housed in the transmission case 10.

  The shift control device 84 of the self-assisted transmission 8 has a shift actuator 150 mounted on the valve body 86 and a select hydraulic circuit 220 and shift hydraulic circuits 236 and 238 for operating the shift actuator 150 in the valve body 86. Forming.

  As a result, the shift control device 84 of the automatic transmission 8 needs to provide the oil pump 26 for the shift actuator 150 and the hydraulic piping that communicates between the oil pump 26 and the shift actuator 150 on the outside of the transmission case 10. In addition, the structure of the automatic transmission 8 can be simplified by integrating the shift actuator 150 into the valve body 86 that controls the friction engagement element 76.

  Since the valve body 86 is disposed in the oil pan 24 attached to the lower part of the transmission case 10, the shift actuator 150 is immersed in the oil stored in the oil pan 24, so that the lubricity is improved. In addition, it is possible to reduce the operating noise that leaks to the outside.

  The shift actuator 150 is moved in the axial direction and rotated around the shaft, and the shift and select shaft 168 is mounted on the shift and select shaft 168 to be attached to the third speed / fourth speed shift yoke 156 and the fifth speed / reverse. The valve body 86 is provided with support portions 172 and 174 that are provided so as to sandwich the shift and select lever 170 and support the shift and select shaft 168. As a result, the shift and select shaft 168 that is long in the axial direction can be stably supported by the valve body 86.

  The valve body 86 is provided with a recess 194 for receiving the base 184 of the shift and select lever 170 fixed to the shift and select shaft 168, so that the shift and select shaft 168 is disposed close to the valve body 86. Therefore, the shift control device 84 can be reduced in size.

  The shift actuator 150 is provided with a rotation lever 222 on the shift and select shaft 168, and a shift piston 232, 234 for applying a rotational force to the rotation lever 222 is provided on the valve body 86, and this shift piston 232, 234 is provided. Is disposed at a position adjacent to the recess 194 around the shift and select shaft 168, the valve body 86 can be further reduced in size.

  The present invention is not limited to the above-described embodiments, and various application modifications can be made. For example, the valve body 86 is integrally provided with support portions 172 and 174 that are disposed so as to sandwich the shift and select lever 170 and support both sides of the shift and select shaft 168 in an axially movable and rotatable manner. Although provided, the shift and select lever 170 and the like must be mounted while the shift and select shaft 168 is inserted through the support portions 172 and 174, which causes a problem that the assembling work is troublesome.

  Therefore, support portions 172 and 174 are formed separately from the valve body 86, and these supports 172 and 174 are mounted in advance on the shift and select shaft 168 together with the shift and select lever 170, the interlock plate 176, and the return spring 206. By attaching the support portions 172 and 174 to the valve body 86 with mounting bolts (not shown) or the like, the shift and select shaft 168 can be attached to the valve body 86 with the shift and select lever 170 and the like being assembled. Assembling work can be simplified.

  In the shift control device for an automatic transmission according to the present invention, a shift actuator is mounted on a valve body that controls a friction engagement element, and a hydraulic circuit is formed in the valve body, so that hydraulic piping and the like are placed outside the transmission case. The structure of the automatic transmission can be simplified by eliminating the need to provide it and integrating the shift actuator in the valve body.

It is a side view of a speed change mechanism and a valve body showing an example of a speed change control device of an automatic transmission. It is a perspective view of a speed change mechanism and a valve body. It is a perspective view of a valve body. It is a perspective view of a shift and select axis. It is a top view of a valve body. It is sectional drawing by the VI-VI line of FIG. It is sectional drawing by the VII-VII line of FIG. It is sectional drawing by the VIII-VIII line of FIG. It is a skeleton figure of an automatic transmission. It is operation | movement explanatory drawing at the time of gear shifting.

Explanation of symbols

2 Engine 8 Automatic transmission 10 Transmission case 20 Planetary gear type transmission unit 22 Parallel shaft gear type transmission unit 24 Oil pan 36 First planetary gear train 38 Second planetary gear train 60 Start clutch 64 Band brake 70 Direct clutch 74 One-way clutch 76 Friction engagement element 84 Transmission control device 86 Valve body 90 Control valve for starting clutch 92 Control valve for band brake 94 Control valve for direct clutch 96 Third gear stage 98 Fourth gear stage 100 Five speed gear stage 102 Reverse gear stage 122 3-speed / 4-speed meshing clutch 132 5-speed meshing clutch 140 Reverse switching mechanism 144 3-speed / 4-speed transmission mechanism 146 5-speed transmission mechanism 148 Reverse transmission mechanism 150 Shift actuator 168 Shift-and-select shaft 170 Shift-and-select Trevor 172/174 Supporting part 176 Interlock plate 194 Recessed part 206 Return spring 216 Select piston 220 Select hydraulic circuit 222 Rotating lever 232/234 Shift piston 236/238 Shift hydraulic circuit 244 Differential

Claims (1)

A planetary gear-type transmission unit that is operated to change speed by a friction engagement element, and a parallel gear that is connected to the planetary gear-type transmission unit and operates a meshing clutch by a hydraulically operated shift actuator to switch the gear stage. In a shift control device for an automatic transmission in which a shaft gear type transmission unit and a valve body that controls the friction engagement element are housed in a transmission case,
The shift actuator is mounted on the valve body, and a hydraulic circuit for operating the shift actuator is formed in the valve body .
The shift actuator includes a shift and select shaft that is mounted on the outer periphery of a shift and select lever that engages with a shift yoke, and that moves in the axial direction and rotates about the axis.
The valve body is disposed in an oil pan attached to the lower part of the transmission case,
Forming a pair of support portions projecting upward from the upper surface of the valve body, and forming a recess recessed between the support portions inside the upper surface of the valve body;
While supporting the shift and select shaft from the upper surface of the valve body upwardly by the support portion,
A shift control apparatus for an automatic transmission , wherein a lower portion of the shift and select lever is accommodated in the recess .

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