JP6328184B2 - Transmission unit - Google Patents

Description

  The present invention relates to a transmission unit including a torque converter and an automatic transmission.

  In a vehicle equipped with an automatic transmission, the torque generated by the engine is input to the automatic transmission via a torque converter, and the driving force changed by the automatic transmission is transmitted to the drive wheels. As an automatic transmission, for example, a continuously variable transmission (CVT) or a stepped automatic transmission (AT) is widely known.

Japanese Patent Laying-Open No. 2015-145682

  For example, as shown in FIG. 3, in a transmission unit 203 including a torque converter 201 and an automatic transmission 202, a substantially cylindrical stator shaft 205 is externally fitted to an input shaft 204 of the automatic transmission 202.

  The input shaft 204 extends from the stator shaft 205 toward the engine (not shown), and a turbine hub 206 of the torque converter 201 is fitted on the end of the input shaft 204 so as not to be relatively rotatable (spline fitting). . A turbine runner 207 of the torque converter 201 is fixed to the turbine hub 206. Further, a front cover 208 of the torque converter 201 is provided on the engine side of the turbine runner 207, and a pump impeller 209 of the torque converter 201 is provided on the opposite side of the turbine runner 207 from the engine side. Further, a stator 210 of the torque converter 201 is provided between the turbine runner 207 and the pump impeller 209. The stator 210 is fixed to the end of the stator shaft 205 on the engine side.

  A unit case 221 that forms the outer shell of the transmission unit 203 includes a first case 222 and a second case 223. The first case 222 and the second case 223 are arranged in this order from the engine side, and are integrated by fastening with bolts. The torque converter 201 is housed in the first case 222, and the automatic transmission 202 is housed in the second case 223.

  The first case 222 has a wall portion 224 that extends along the pump impeller 209 at a distance from the pump impeller 209. A circular opening 225 is formed in the wall portion 224 so as to penetrate in the rotation axis direction of the input shaft 204, and the stator shaft 205 is inserted through the opening 225.

  A substantially annular plate-like retainer 231 is externally fitted to the stator shaft 205 so as not to rotate relative to the portion extending from the wall 224 toward the second case 223 by press-fitting. The retainer 231 is fastened to the second case 223 with a bolt. As a result, the stator shaft 205 is fixedly held by the second case 223 via the retainer 231.

  An oil passage 232 and a connection oil passage 233 are formed inside the retainer 231. The oil passage 232 extends in the rotational radial direction and is opened on the inner peripheral surface of the retainer 231. The connecting oil passage 233 extends in the rotation axis direction at the outer peripheral end of the retainer 231, communicates with the oil passage 232, and is opened at the end surface 234 on the opposite side of the retainer 231 from the engine side. The second case 223 is formed with a supply oil passage 236 that is opened at the end face 235. The end surface 234 of the retainer 231 contacts the end surface 235 of the second case 223, and the connection oil path 233 communicates with the supply oil path 236. An oil passage 237 is formed in the stator shaft 205. The oil passage 237 communicates with the oil passage 232 of the retainer 231.

  In the transmission unit 203, the hydraulic pressure generated by the oil pump 238 is regulated by the valve body, and oil is supplied from the valve body to the supply oil passage 236 by the hydraulic pressure. The oil supplied to the supply oil passage 236 passes through the connecting oil passage 233 and the oil passage 232 of the retainer 231 in this order, and is supplied to the oil passage 232 of the stator shaft 205, opposite to the engine side of the retainer 231 from the oil passage 232. It is supplied to a clutch 241 provided on the side.

  In such a configuration, the total amount of at least the thickness of the wall portion 224 of the first case 222, the thickness of the retainer 231, and the gap between the wall portion 224 and the retainer 231 is between the torque converter 201 and the automatic transmission 202. The interval is necessary. For this reason, the dimension of the transmission unit 203 in the rotation axis direction (unit total length) must be increased. Moreover, the bolt etc. for fastening the retainer 231 to the 2nd case 223 are required, and there also exists a problem that there are many number of parts.

  An object of the present invention is to provide a transmission unit that can shorten the overall length of the unit and reduce the number of parts.

  To achieve the above object, a transmission unit according to the present invention includes a torque converter, an automatic transmission, a stator shaft that holds a stator of the torque converter, and an input shaft of the automatic transmission is rotatably inserted; A retainer that is provided between the torque converter and the automatic transmission and is fitted on the stator shaft so as not to rotate relative to the stator shaft; and a unit case that forms an outer shell, the unit case including a first case that houses the torque converter; The second case is coupled to the first case and accommodates the automatic transmission, and at least a part of the retainer is formed integrally with the first case.

  According to this configuration, the torque converter and the automatic transmission are housed in the first case and the second case of the unit case, respectively. The first case and the second case are joined together and integrated.

  An input shaft of the automatic transmission is rotatably inserted into the stator shaft. The stator shaft holds the stator of the torque converter. A retainer is provided between the torque converter and the automatic transmission so as to be fitted on the stator shaft so as not to rotate relative to the stator shaft. At least a part of the retainer is integrally formed with the first case. Thereby, compared with the structure (refer FIG. 3) in which the 1st case has the wall part interposed between a torque converter and a retainer (refer FIG. 3), since the wall part also serves as the wall part, The total length of the unit can be shortened by the total thickness of the portion and the total gap between the wall portion and the retainer. Further, a bolt for fixing the retainer to the first case or the second case is unnecessary, and the number of parts constituting the transmission unit can be reduced.

  The retainer only needs to be at least partly formed integrally with the first case, but it is preferable that the entirety (all) of the retainer is formed integrally with the first case.

  In a configuration in which a part of the retainer is formed integrally with the first case, it is necessary to join the remaining part to the part of the retainer, and a member (such as a bolt or an adhesive) and a process for the joining are necessary. However, since the whole retainer is formed integrally with the first case, they can be made unnecessary. As a result, the cost of the transmission unit can be reduced.

  The first case is formed with a first outer peripheral wall portion having a first end surface, and the second case is formed with a second outer peripheral wall portion having a second end surface that is abutted against the first end surface. Is preferably formed integrally with the first case and protrudes toward the automatic transmission in the rotational axis direction with respect to the first end surface.

  In this configuration, since the first outer peripheral wall portion does not exist on the outer side in the rotational radial direction of the portion protruding toward the automatic transmission with respect to the first end surface of the retainer, the first outer peripheral wall portion is used by using a tool such as a drill. A through hole extending in the rotational radial direction can be formed in the retainer without making a hole in the retainer. Then, by press-fitting the ball into the outer end portion of the through hole, an oil passage that is opened on the inner peripheral surface (contact surface with the stator shaft) of the retainer can be formed in the retainer.

  On the other hand, in the configuration in which the retainer is provided on the torque converter side in the rotational axis direction with respect to the first end surface, the first outer peripheral wall portion and A through hole can be formed in the retainer. And the oil path open | released by the internal peripheral surface of a retainer can be formed in a retainer by sealing the outer side edge part of the through-hole with a volt | bolt and a gasket.

  In the former configuration, since no hole is formed in the first outer peripheral wall portion, a configuration for sealing the hole is unnecessary, and it can be said that it is superior in that there is less concern about oil leakage than the latter configuration.

  According to the present invention, the length of the transmission unit in the rotation axis direction can be shortened. Further, the number of parts constituting the transmission unit can be reduced.

It is sectional drawing which shows the structure of a part of transmission unit which concerns on the 1st Embodiment of this invention. It is sectional drawing which shows the structure of a part of transmission unit which concerns on the 2nd Embodiment of this invention. It is sectional drawing which shows the structure of a part of conventional transmission unit.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

<Transmission unit>
FIG. 1 is a cross-sectional view showing a partial configuration of a transmission unit 1 according to a first embodiment of the present invention. In FIG. 1, only the cross section of the unit case 4 is hatched, and the hatching of the cross sections of the other members is omitted.

  The transmission unit 1 is a unit that is mounted on a vehicle, changes the torque generated by an engine (not shown), and transmits the torque to drive wheels (not shown), and includes a torque converter 2 and an automatic transmission 3. The torque converter 2 and the automatic transmission 3 are accommodated in a unit case 4 that forms an outer shell of the transmission unit 1.

<Torque converter>
The torque converter 2 includes a front cover 11, a pump impeller 12, a turbine hub 13, a turbine runner 14, a lockup mechanism 15, and a stator 16.

  The front cover 11 extends in a substantially disk shape around the rotation axis, and has an outer peripheral end bent toward the automatic transmission 3 (left side in FIG. 1; hereinafter referred to as “left side”). The center portion of the front cover 11 bulges to the engine side (the right side in FIG. 1, hereinafter referred to as “the right side”). The generated torque (engine torque) of the engine is input to the bulged portion.

  The pump impeller 12 is disposed on the left side of the front cover 11. The outer peripheral end of the pump impeller 12 is connected to the outer peripheral end of the front cover 11 and is provided so as to be able to rotate integrally with the front cover 11 around the rotation axis. A plurality of blades 21 are arranged radially on the inner surface of the pump impeller 12.

  The turbine hub 13 is disposed between the front cover 11 and the pump impeller 12. The turbine hub 13 integrally includes a substantially cylindrical boss portion 22 and a flange portion 23 extending from the boss portion 22 to the outside in the rotational radial direction.

  The turbine runner 14 is fixed to the surface of the flange 23 of the turbine hub 13 on the pump impeller 12 side. A plurality of blades 24 are arranged radially on the surface of the turbine runner 14 facing the pump impeller 12.

  The lockup mechanism 15 includes a lockup piston 25 and a damper mechanism 26.

  The lock-up piston 25 has a substantially annular plate shape, and an inner peripheral end portion thereof is fitted on the flange portion 23 of the turbine hub 13 and is positioned between the front cover 11 and the turbine runner 14. If the hydraulic pressure of the engagement side oil chamber 27 on the turbine runner 14 side is higher than the hydraulic pressure of the release side oil chamber 28 on the front cover 11 side with respect to the lockup piston 25, the differential pressure causes the lockup piston 25 to move to the front cover. Move to the 11 side. Conversely, if the hydraulic pressure in the release side oil chamber 28 is higher than the hydraulic pressure in the engagement side oil chamber 27, the lockup piston 25 moves to the turbine runner 14 side due to the differential pressure.

  A friction material 29 is stuck to the outer peripheral end of the surface of the lockup piston 25 on the front cover 11 side. When the lock-up piston 25 moves to the front cover 11 side due to the differential pressure and the friction material 29 is pressed against the front cover 11, the pump impeller 12 and the turbine runner 14 are directly connected (lock-up on). From this state, when the lockup piston 25 moves to the turbine runner 14 side due to the differential pressure, the friction material 29 is separated from the front cover 11 and the direct connection between the pump impeller 12 and the turbine runner 14 is released (lockup off). The

  The damper mechanism 26 is a mechanism for dampening vibrations from the engine when the pump impeller 12 and the turbine runner 14 are directly connected. Specifically, the damper mechanism 26 includes a retaining plate 31 supported by the lock-up piston 25, a spring 32 supported by the retaining plate 31, and the retaining plate 31 elastically in the rotational direction via the spring 32. And a driven plate 33 connected to each other and an outer peripheral member 34 surrounding the outer periphery of the spring 32. The vibration input to the front cover 11 is damped as the spring 32 repeatedly compresses and restores between the retaining plate 31 and the driven plate 33.

  The stator 16 is disposed between the pump impeller 12 and the turbine runner 14.

  When the pump impeller 12 is rotated by the engine torque in the lock-up off state, an oil flow from the pump impeller 12 toward the turbine runner 14 is generated. The oil flow is received by the blade 24 of the turbine runner 14 and the turbine runner 14 rotates. At this time, the amplifying action of the torque converter 2 occurs, and the turbine runner 14 generates a torque larger than the engine torque.

<Automatic transmission>
The automatic transmission 3 includes an input shaft 41.

  The input shaft 41 is formed as a hollow shaft. The input shaft 41 extends on the rotational axis of the torque converter 2 and is inserted through the torque converter 2. A boss portion 22 of the turbine hub 13 is externally fitted to the right end portion of the input shaft 41, and the boss portion 22 is spline-fitted. As a result, the input shaft 41 rotates integrally with the turbine hub 13, and further rotates together with the turbine runner 14 and the lockup mechanism 15 (the lockup piston 25 and the damper mechanism 26) fixed to the turbine hub 13. To do.

  A substantially cylindrical stator shaft 42 is fitted on the input shaft 41. The right end portion of the stator shaft 42 is located between the pump impeller 12 and the turbine runner 14 in the rotational axis direction, and a space is provided between the end portion and the boss portion 22 of the turbine hub 13. Yes. The stator 16 of the torque converter 2 is fixed to the right end portion of the stator shaft 42, and the stator shaft 42 supports the stator 16 so as not to rotate. The stator shaft 42 extends from the torque converter 2 to the left side. A substantially annular plate-like retainer 43 is fitted on the stator shaft 42 by press-fitting in a portion extending from the torque converter 2.

  A gap 44 is provided between the input shaft 41 and the stator shaft 42, and a needle roller bearing 45 is disposed in the gap 44 at a position facing the retainer 43 in the rotational radial direction. The input shaft 41 is rotatably held on the stator shaft 42 via a needle roller bearing 45. Further, an inner race (inner ring) of a ball bearing 46 is fitted on the left end of the input shaft 41. An outer race (outer ring) of the ball bearing 46 is fixed to the unit case 4. Thus, the left end of the input shaft 41 is rotatably held by the unit case 4 via the ball bearing 46.

  The input shaft 41 extends to the left from the ball bearing 46, and the extended portion transmits the rotation of the input shaft 41 to a shaft (primary shaft) 51 provided in parallel with the input shaft 41. The gear 52 is integrally formed.

<Unit case>
The unit case 4 is divided into a first case 61, a second case 62 and a third case 63. The first case 61, the second case 62, and the third case 63 are made of, for example, an aluminum alloy and are cast by a die casting method. The first case 61, the second case 62, and the third case 63 are arranged in this order from the engine side, and are integrated by fastening with bolts. The torque converter 2 is housed in the first case 61, and the automatic transmission 3 is housed in the second case 62 and the third case 63.

  The first case 61 integrally includes a first outer peripheral wall portion 64 that faces the torque converter 2 from the outside in the rotational radial direction, and an end wall portion 65 that faces the torque converter 2 from the left side.

  The first outer peripheral wall portion 64 has a substantially C-shape (substantially U-shape) when viewed from the right side, and is open to the right side. The first outer peripheral wall portion 64 has a shape constricted on the left side, and has a first end face 66 at the left end.

  The end wall portion 65 extends from the first outer peripheral wall portion 64 toward the stator shaft 42. The end wall portion 65 constitutes a part of the retainer 43. A groove 67 having a substantially semicircular cross section is formed at the outer peripheral end of the end wall 65. The outer peripheral end of the groove 67 coincides with the inner peripheral end of the first end surface 66 of the first outer peripheral wall portion 64. The end wall portion 65 is integrally formed with a bulging portion 68 that bulges to the left with the inner peripheral end of the groove 67 as the outer peripheral end, and the bulging portion 68 constitutes the remaining portion of the retainer 43. ing.

  That is, the retainer 43 is formed integrally with the first case 61. A part of the retainer 43 is disposed inside the first outer peripheral wall part 64, and the remaining part (the bulging part 68) of the retainer 43 is on the left side with respect to the first end surface 66 of the first outer peripheral wall part 64. Protruding. By forming the retainer 43 integrally with the first case 61, the stator shaft 42 is fixedly held by the unit case 4 via the retainer 43.

  The first outer peripheral wall portion 64 does not exist outside the bulging portion 68 in the rotational radial direction. Therefore, a through hole extending in the radial direction can be formed in the bulging portion 68 without making a hole in the first outer peripheral wall portion 64 using a tool such as a drill. By this construction method, a plurality of through holes are formed in the bulging portion 68. A plurality of oil passages 71 are formed in the retainer 43 by being press-fitted into the outer end portions of the respective through-holes. The oil passages 71 are opened on the inner peripheral surface (contact surface with the stator shaft 42). Yes. Further, a connection oil passage 72 extending in the rotation axis direction is formed at the outer peripheral end of the retainer 43. The connection oil passage 72 is provided corresponding to each oil passage 71, communicates with the oil passage 71, and is opened at the left end face of the retainer 43 (the bulging portion 68).

  The second case 62 has a second outer peripheral wall portion 82 having a second end surface 81 that abuts the first end surface 66 of the first case 61. The second case 62 is formed with a substantially cylindrical portion 83 extending in the rotation axis direction corresponding to each connection oil passage 72 of the retainer 43. The internal space of the cylindrical portion 83 is formed as a supply oil passage 84. In a state where the first case 61 and the second case 62 are fastened, the right end surface of each cylindrical portion 83 abuts on the left end surface of the retainer 43, and each supply oil passage 84 and the corresponding retainer 43 are connected to each other. An oil passage 72 is connected.

<Oil supply structure>
An oil pump 5 is disposed on the left side of the input shaft 41. The oil pump 5 includes a pump drive shaft 101 and a pump gear 102.

  The pump drive shaft 101 extends along the rotation axis and is inserted into the input shaft 41. The right end of the pump drive shaft 101 is directly connected to the front cover 11 of the torque converter 2. A gap is provided between the input shaft 41 and the pump drive shaft 101, and an inter-shaft oil passage 111 is provided by the gap. The left end of the inter-shaft oil passage 111 is sealed with a seal 112. The inter-shaft oil passage 111 is opened at the right end face of the input shaft 41 and communicates with the release-side oil chamber 28 between the front cover 11 and the lockup piston 25.

  An axial oil passage 113 is formed at the left end of the pump drive shaft 101. Further, the pump drive shaft 101 is formed with a communication oil passage 114 that connects the inter-shaft oil passage 111 and the shaft center oil passage 113.

  The pump gear 102 is provided so as to be able to rotate integrally with the pump drive shaft 101. When the front cover 11 of the torque converter 2 rotates, the pump drive shaft 101 rotates and the pump gear 102 rotates integrally with the pump drive shaft 101. As the pump gear 102 rotates, oil pressure is generated in the oil pump 5, and the oil pressure is supplied to a valve body (not shown).

  A communication oil passage 115 is formed in the stator shaft 42.

  The communication oil passage 115 communicates with one of the oil passages 71 formed in the retainer 43. Further, the communication oil passage 115 is opened to the clearance 44 between the input shaft 41 and the stator shaft 42 on the right side of the needle roller bearing 45, and communicates with the clearance 44.

  The hydraulic pressure supplied from the oil pump 5 to the valve body is regulated by the valve body. Then, oil is supplied from the valve body to the shaft oil passage 113 and the supply oil passages 84 formed in the second case 62 by the hydraulic pressure.

  The oil supplied to the shaft center oil passage 113 is supplied to the inter-shaft oil passage 111 through the communication oil passage 114, flows through the inter-shaft oil passage 111, and is supplied to the release-side oil chamber 28 of the torque converter 2.

  Oil supplied to one of the supply oil passages 84 is supplied to the oil passage 71 through a connection oil passage 132 formed in the retainer 43, and a gap between the input shaft 41 and the stator shaft 42 through the communication oil passage 115. 44. Then, the air flows through the gap 44 and is supplied to the engagement side oil chamber 27 of the torque converter 2 through the space between the right end portion of the stator shaft 42 and the boss portion 22 of the turbine hub 13.

<Effect>
As described above, the input shaft 41 of the automatic transmission 3 is rotatably inserted through the stator shaft 42. The stator shaft 42 holds the stator 16 of the torque converter 2. A retainer 43 is provided between the torque converter 2 and the automatic transmission 3 so as to be fitted on the stator shaft 42 so as not to be relatively rotatable.

  The retainer 43 is formed integrally with the first case 61 of the unit case 4. Thereby, in addition to the retainer 43, the retainer 43 doubles as a wall portion as compared with a configuration in which the first case 61 has a wall portion interposed between the torque converter 2 and the retainer 43 (see FIG. 3). Therefore, the length of the transmission unit 1 in the rotation axis direction (unit total length) can be shortened by the total thickness of the wall portion and the gap between the wall portion and the retainer 43. Further, a bolt or the like for fixing the retainer 43 to the first case 61 or the second case 62 is unnecessary, and the number of parts constituting the transmission unit 1 can be reduced.

  Further, the bulging portion 68 constituting the retainer 43 protrudes to the left with respect to the first end surface 66 of the first case 61. Therefore, since the first outer peripheral wall 64 of the first case 61 does not exist outside the bulging portion 68 in the rotational radial direction, a hole is made in the first outer peripheral wall 64 using a tool such as a drill. Instead, the retainer 43 can be formed with a through hole extending in the rotational radial direction. Then, by inserting the ball 69 into the outer end portion of the through hole, the oil passage 71 opened on the inner peripheral surface of the retainer 43 can be formed in the retainer 43. Further, since no hole is formed in the first outer peripheral wall portion 64, the risk of oil leakage from the unit case 4 can be reduced.

Second Embodiment
FIG. 2 is a cross-sectional view showing a partial configuration of the transmission unit 1 according to the second embodiment of the present invention. In FIG. 2 as well, only the cross section of the unit case 4 is hatched, and the hatching of the cross sections of the other members is omitted. In FIG. 2, the same reference numerals as those of the respective parts are given to the parts corresponding to the respective parts shown in FIG. 1. In the following, description of the parts denoted by the same reference numerals is omitted, and only the differences between the configuration shown in FIG. 2 and the configuration shown in FIG. 1 will be described.

  In the configuration shown in FIG. 2, the entire retainer 43 is provided on the inner side of the first outer peripheral wall portion 64, that is, on the right side with respect to the first end surface 66 of the first outer peripheral wall portion 64. And the through-hole from the outer peripheral surface of the 1st outer peripheral wall part 64 to the inner peripheral surface of the retainer 43 is formed, the volt | bolt 121 is screwed into the outer side edge part of the through-hole, and the volt | bolt 121 and the 1st outer peripheral wall part 64 and By interposing the gasket 122 therebetween, the retainer 43 is formed with a plurality of oil passages 123 that are opened on the inner peripheral surface (contact surface with the stator shaft 42). The oil passage 123 communicates with a connection oil passage 72 formed at the outer peripheral end of the retainer 43.

  With the configuration shown in FIG. 2 as well, the overall length of the transmission unit 1 can be shortened, and the number of parts constituting the transmission unit 1 can be reduced.

<Modification>
As mentioned above, although two embodiment of this invention was described, this invention can also be implemented with another form.

  For example, in each of the above-described embodiments, the configuration in which the entire retainer 43 is integrally formed with the first case 61 is taken up. However, a part of the retainer 43 (for example, the end wall portion 65) is attached to the first case 61. The remaining part of the retainer 43 (for example, the bulging part 68) is joined to the part by using an adhesive or the like, so that the entire retainer 43 is integrally provided in the first case 61. It may be done.

  1 and FIG. 2 show a part of a transmission unit 1 having a known continuously variable transmission (CVT). However, in the present invention, a stepped automatic transmission ( The present invention can be widely applied to a transmission unit including an automatic transmission other than a continuously variable transmission such as AT (Automatic Transmission).

  In addition, various design changes can be made to the above-described configuration within the scope of the matters described in the claims.

DESCRIPTION OF SYMBOLS 1 Transmission unit 2 Torque converter 3 Automatic transmission 4 Unit case 16 Stator 41 Input shaft 42 Stator shaft 45 Retainer 61 1st case 62 2nd case

Claims (1)

A torque converter;
An automatic transmission,
A stator shaft that holds a stator of the torque converter and through which an input shaft of the automatic transmission is rotatably inserted;
Provided between the torque converter and the automatic transmission, wherein are fitted to rotate relative to the stator shaft, a retainer you contact from the rotation radial direction of the input shaft to the stator shaft,
With a unit case that forms an outer shell,
The unit case includes a first case that houses the torque converter, and a second case that is coupled to the first case and houses the automatic transmission,
At least a part of the retainer is formed integrally with the first case ,
A transmission unit in which the retainer is formed with an oil passage extending in the rotational radial direction with respect to the stator shaft .

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