JP2010144844A - Assembly method for automatic transmission - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate assembly of an automatic transmission by reducing the frequency of carrying out spline engagement of object members in a plurality of sites at the same time during assembly. <P>SOLUTION: In the assembly method for an automatic transmission, cylindrical parts 11b, 21b to be fit on an input shaft 4 are provided on output members 11, 21 of two clutches 10, 20. A first assembly body is formed, comprised by incorporating a planetary gear set between a middle wall and a rear wall of a transmission case in a removed state of a front wall, a second assembly body SA2 is formed, comprising the input shaft 4 and the two clutches 10, 20 by attaching the two clutches 10, 20 to the input shaft 4, both assembly bodies are combined by piercing a portion in a rear wall side of the input shaft 4 in the second assembly body SA2 and the cylindrical parts 11b, 21b of the output members 11, 21 of the two clutches 10, 20 through the middle wall of the transmission case to a rear wall side, and connecting their tips to the planetary gear set in the first assembly body. After combining, a front wall side portion of the input shaft 4 is pierced through the front wall, and the front wall is joined to the transmission case. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for assembling an automatic transmission in which output members of two clutches are connected to components of different planetary gear sets, and belongs to the field of manufacturing technology for automobile transmissions.

  As described in Patent Document 1, conventionally, a multi-stage is provided by providing two clutches for selecting a power transmission path to the planetary gear set on the input side of a plurality of planetary gear sets constituting the transmission mechanism. There is an automatic transmission that has been realized.

  These clutches have a drum, a hub, and a plurality of friction plates that are disposed between and engage with each other alternately, and are engaged by a piston receiving hydraulic pressure to press the plurality of friction plates. The state is a state where power is transmitted from the drum to the hub or from the hub to the drum.

  Specifically, in what is described in FIGS. 2 and 3 of Patent Document 1, the hub of one clutch and the drum of the other clutch are configured by a common member, and the member is connected to the input shaft. It is an input member of both clutches. The drum of one clutch is connected as an output member to a carrier of the planetary gear set via a connecting member that is spline-engaged with the drum, and the hub of the other clutch is connected as an output member to the sun gear of the planetary gear set. The input shaft is divided into a first half portion on the clutch side and a second half portion on the planetary gear set side, and input members of both clutches are connected to the first half portion.

  In addition to this, a non-divided input shaft is provided, the drums of two clutches are connected as input members to the front half of the input shaft, and the respective hubs are connected as output members to components of different planetary gear sets. There are also automatic transmissions.

  In any transmission, the power transmission path to the planetary gear set side is switched depending on which of the two clutches is engaged.

JP 2007-78191 A

  By the way, in the configuration in which the input shaft is divided into the first half part and the second half part as in the automatic transmission described in Patent Document 1, the second half part of the input shaft, the planetary gear set, etc. In this state, an assembly body in which the clutch is assembled to the input shaft is assembled into the transmission case. However, in this automatic transmission, there is a need to adjust the axial clearance. The connecting member of one clutch connected to the planetary gear set and the hub of the other clutch are assembled on the transmission case side first. In this case, when the assembly body is assembled, the connecting member and the drum of one clutch are connected to each other, the hub of the other clutch, and the plurality of frictions of the clutch while the front half portion and the rear half portion of the divided input shaft are coupled. The plate is simultaneously splined.

  Also, in an automatic transmission in which two clutch drums are connected to an input shaft and each hub is connected to a component of a plurality of different planetary gear sets, the two clutch hubs are incorporated on the transmission case side. Then, it is conceivable that an assembly body composed of an input shaft, two clutch drums connected to the input shaft, and a friction plate engaged with the drum is combined on the transmission case side. In addition, the two clutch hubs and the corresponding friction plates are simultaneously spline-engaged when they are combined.

  In any case, spline engagement must be performed at two or more locations at the same time, and in particular, the operation of engaging the clutch hub with a plurality of friction plates at two locations at the same time or the engagement operation at other locations. It is very troublesome to carry out at the same time, and there is a problem that assembly workability is poor.

  Therefore, the present invention is an automatic transmission in which output members of two clutches are connected to components of different planetary gear sets, and it is possible to reduce spline engagement between target members at a plurality of locations at the same time during assembly. It is an object of the present invention to provide a method of assembling an automatic transmission that can facilitate the above.

In order to solve the above-mentioned problem, the invention described in claim 1 includes a front wall, a rear wall, and an intermediate wall provided between the two walls, and at least the front wall is separated from other parts. A transmission case,
Two clutches disposed between a front wall and an intermediate wall of the transmission case, each having an input member, an output member, and a plurality of friction plates alternately engaged with the two members;
A planetary gear set disposed between an intermediate wall and a rear wall of the transmission case;
An input shaft that is disposed in the center of the two clutches and the planetary gear set, connected to the input member of the two clutches on the front wall side, and connected to the planetary gear set on the rear wall side; and
The two clutch output members are provided with a cylindrical portion extending from the intermediate wall to the rear wall side in a state fitted to the input shaft,
An assembly method of an automatic transmission in which these cylindrical portions are connected to the planetary gear set,
A first assembly body forming step of forming a first assembly body in which a planetary gear set is incorporated between an intermediate wall and a rear wall of the transmission case with the front wall of the transmission case removed;
A second assembly body forming step of assembling the two clutches on the input shaft to form a second assembly body composed of the input shaft and the two clutches;
After both of the steps, the rear wall side portion of the input shaft in the second assembly body and the cylindrical portion of the output member of the two clutches are inserted through the intermediate wall of the transmission case to the rear wall side, and the tip portions thereof Combining the two assembly bodies by connecting to the planetary gear set in the first assembly body,
A step of inserting a front wall side portion of the input shaft into the front wall after the merging step and coupling the front wall to another portion of the transmission case;

According to a second aspect of the invention, there is provided an automatic transmission assembling method according to the first aspect,
The two clutches are arranged inside and outside at substantially the same position in the axial direction, and the cylindrical part of the output member of the first clutch arranged outside is the outer periphery of the cylindrical part of the output member of the second clutch arranged inside. The cylindrical portion of the output member of the second clutch is configured to be fitted to the outer periphery of the input shaft,
In the second assembly body forming step, the input members of the first and second clutches are connected to the input shaft, and a plurality of friction plates are assembled to the input members,
First, while fitting the cylindrical portion of the output member of the second clutch to the input shaft, the output member is engaged with the friction plate of the second clutch,
Next, the output member of the first clutch is engaged with the friction plate of the first clutch while fitting the cylindrical portion of the output member of the first clutch with the cylindrical portion of the output member of the second clutch.

Further, the invention according to claim 3 is the assembly method of the automatic transmission according to claim 2,
In the second assembly body forming step,
When fitting the cylindrical portion of the output member of the second clutch to the input shaft, the input shaft is fitted into the bearing member mounted on the inner peripheral surface of the cylindrical portion,
When the cylindrical portion of the output member of the first clutch is fitted to the cylindrical portion of the output member of the second clutch, the second clutch is attached to the bearing member mounted on the inner peripheral surface of the cylindrical portion of the first clutch. This is characterized in that a cylindrical portion is inserted.

Furthermore, the invention according to claim 4 is the method of assembling the automatic transmission according to claim 2 or 3,
The portion where the input members of the first and second clutches of the input shaft are connected is configured to have a larger diameter than the portion where the cylindrical portions of the output members of both clutches are fitted,
In the coalescence process,
Install the first assembly body with the axial direction vertical so that the rear wall side is down,
Above that, holding the second assembly body by locking the output member of the first clutch with a jig, with the axial direction also oriented vertically.
By lowering the second assembly body from this state, the second assembly body is combined with the first assembly body.

In addition, the invention according to claim 5 is the assembly method of the automatic transmission according to any one of claims 1 to 4,
In the combining step, the tip of the input shaft in the second assembly body is fitted to a bearing member mounted on the rear wall of the transmission case constituting the first assembly body,
In the front wall coupling step, a portion of the input shaft on the front wall side is inserted through a bearing member attached to the front wall.

  According to the first aspect of the present invention, the second assembly body is formed by previously assembling the entire two clutches on the input shaft, and the second assembly body is assembled into the transmission case with the planetary gear set. Since it is combined with the assembly body, the input members of the two clutches are connected to the input shaft, and a plurality of friction plates are assembled to these input members, respectively, and the output members of both clutches are the plurality of friction plates of the corresponding clutches. Can be engaged in order. As compared with the case where the two output members are simultaneously engaged with the plurality of friction plates assembled to the input members of the two clutches, the assembling work is facilitated.

  According to the second aspect of the present invention, the output member of the second clutch engages with the friction plate of the second clutch while its cylindrical portion is fitted to the input shaft, and the output member of the first clutch is The cylindrical portion engages with the friction plate of the first clutch while being fitted to the outer periphery of the cylindrical portion of the output member of the second clutch, that is, the output member of the second clutch does not wobble in the radial direction on the input shaft. As a result, the output member of the first clutch is guided to the output member of the second clutch without wobbling in the radial direction, so that the engagement between the output member and the friction plate is facilitated in both clutches.

  Furthermore, according to the invention of claim 3, the bearing member mounted on the inner peripheral surface of the cylindrical portion of the output member of the second clutch, and the inner peripheral surface of the cylindrical portion of the output member of the first clutch. The mounted bearing member eliminates rattling between the input shaft and the output member of the second clutch, and prevents rattling between the output members of both clutches. Is even easier.

  Furthermore, according to the fourth aspect of the present invention, the input shaft of the first and second clutches are connected, and the portion of the input shaft having a larger diameter than the portion where the cylindrical portions of the output members of both clutches are fitted. Thus, the entire second assembly body can be held in a state in which the axial direction is directed vertically so that the rear wall side of the transmission case faces down by merely locking the output member of the first clutch. That is, the first assembly is installed with the axial direction vertically oriented so that the rear wall side is down while holding the second assembly body without the input shaft and the output member of the second clutch falling off and maintaining the posture. Can be combined with the body.

  In addition, according to the invention described in claim 5, the input shaft is supported by the bearing member whose tip is mounted on the rear wall of the transmission case, and the front wall side portion is mounted on the front wall. The automatic transmission supported by the bearing is assembled.

  Embodiments of the present invention will be described below.

  FIG. 1 is a skeleton diagram showing a configuration of an automatic transmission according to an embodiment of the present invention. This automatic transmission 1 is applied to an engine-side mounted vehicle such as a front engine front drive vehicle, As main components, a torque converter 3 attached to the engine output shaft 2, a first clutch 10 and a second clutch 20 to which power from the torque converter 3 is input via the input shaft 4, and these clutches 10 , 20 and a transmission mechanism 30 to which power is input from one or both of them, and these are arranged on the axis of the input shaft 4 and are housed in the transmission case 5.

  Here, the transmission case 5 includes a main body portion 5a constituting the outer periphery, a front side (torque converter side) wall 5b in which an oil pump 6 driven by the engine via the torque converter 3 is housed, and a main body. The end cover 5c closes the opening of the end portion on the rear side (anti-torque converter side) of the portion 5a, and an intermediate wall 5d provided in an intermediate portion of the main body portion 5a.

  The first and second clutches 10 and 20 are housed between the front cover 5b and the intermediate wall 5d, and the speed change mechanism 30 is housed between the intermediate wall 5d and the end cover 5c. The output gear 7 for taking out the power from the speed change mechanism 30 is arranged between the second clutches 10 and 20 and the intermediate wall 5d, and the power taken out from the output gear 7 is transmitted via the counter drive mechanism 8 to the difference. It is transmitted to the moving device 9 and drives the left and right axles 9a, 9b.

  The torque converter 3 includes a case 3a connected to the engine output shaft 2, a pump 3b fixed in the case 3a, and disposed opposite to the pump 3b and driven by the pump 3b via hydraulic oil. A turbine 3c, a stator 3e interposed between the pump 3b and the turbine 3c and supported by the transmission case 5 via a one-way clutch 3d to increase the torque; a case 3a and a turbine 3c; The lockup clutch 3f is provided between the engine output shaft 2 and the turbine 3c via the case 3a. Then, the rotation of the turbine 3 c is transmitted to the first and second clutches 10 and 20 and the transmission mechanism 30 via the input shaft 4.

  The transmission mechanism 30 includes first, second, and third planetary gear sets (hereinafter simply referred to as “first, second, and third gear sets”) 40, 50, and 60, which are intermediate in the transmission case 5. They are arranged in this order from the front side between the wall 5d and the end cover 5c.

  In addition to the first and second clutches 10 and 20, the first brake 70, the second brake 80, and the third brake 90 constituting the speed change mechanism 30 are provided as friction elements, and are arranged in this order from the front side. Has been. A one-way clutch 100 is disposed in parallel with the first brake 70.

  The first, second, and third gear sets 40, 50, and 60 are all single-pinion type planetary gear sets, and each of the sun gears 41, 51, and 61 is engaged with the sun gears 41, 51, and 61, respectively. Pinions 42, 52, 62, carriers (pinion carriers) 43, 53, 63 for supporting these pinions 42, 52, 62, and ring gears 44, 54, 64 meshed with the pinions 42, 52, 62, respectively. It consists of

  The input shaft 4 is connected to the sun gear 61 of the third gear set 60, the sun gear 41 of the first gear set 40, the sun gear 51 of the second gear set 50, the ring gear 44 of the first gear set 40, and the carrier of the second gear set 50. 53, the ring gear 54 of the second gear set 50 and the carrier 63 of the third gear set 60 are connected to each other. The output gear 7 is connected to the carrier 43 of the first gear set 40.

  The sun gear 41 of the first gear set 40 and the sun gear 51 of the second gear set 50 are connected to the output member 11 of the first clutch 10 and connected to the input shaft 4 via the first clutch 10 so as to be connectable and detachable. Yes. The carrier 53 of the second gear set 50 is connected to the output member 21 of the second clutch 20 and is connected to the input shaft 4 via the second clutch 20 so as to be connectable / disengageable.

  Further, the ring gear 44 of the first gear set 40 and the carrier 53 of the second gear set 50 are connected to the transmission case 5 via the first brake 70 and the one-way clutch 100 arranged in parallel so as to be connected and disconnected. The ring gear 54 of the second gear set 50 and the carrier 63 of the third gear set 60 are detachably connected to the transmission case 5 via the second brake 80, and the ring gear 64 of the third gear set 60 is connected to the third gear set 60. The brake case 90 is connected to the transmission case 5 via a brake 90 so as to be connectable and detachable.

  With the above configuration, according to the automatic transmission 1, the sixth forward speed and the reverse speed are achieved by combining the engagement states of the first and second clutches 10 and 20 and the first, second, and third brakes 70, 80, and 90. The relationship between the combination and the gear position is shown in the fastening table of FIG.

  That is, at the first speed, the first clutch 10 and the first brake 70 are engaged, and the rotation of the input shaft 4 is input to the sun gear 41 of the first gear set 40 and is decelerated by the first gear set 40 with a large reduction ratio. And output from the carrier 43 of the first gear set 40 to the output gear 7. The first brake 70 is engaged only at the first speed for operating the engine brake, and at the first speed where the engine brake is not operated, the one-way clutch 100 is locked to form the first speed.

  In the second speed, the first clutch 10 and the second brake 80 are engaged, and the rotation of the input shaft 4 is input to the sun gear 41 of the first gear set 40 and at the same time via the second gear set 50. The rotation of the input shaft 4 is decelerated at a reduction ratio smaller than the first speed and is output from the carrier 43 of the first gear set 40 to the output gear 7.

  In the third speed, the first clutch 10 and the third brake 90 are engaged, and the rotation of the input shaft 4 is input to the sun gear 41 of the first gear set 40 and simultaneously via the third gear set 60 and the second gear set 50. The rotation of the input shaft 4 is decelerated at a reduction ratio smaller than that of the second gear and is output from the carrier 43 of the first gear set 40 to the output gear 7.

  In the fourth speed, the first clutch 10 and the second clutch 20 are engaged, and the rotation of the input shaft 4 is input to the sun gear 41 of the first gear set 40 and at the same time passes through the second gear set 50 as it is. It is also input to the ring gear 44 of the gear set 40. As a result, the entire first gear set 40 rotates integrally with the input shaft 4, and rotation with a reduction ratio of 1 is output from the carrier 43 to the output gear 7.

  At the fifth speed, the second clutch 20 and the third brake 90 are engaged, and the rotation of the input shaft 4 is input to the ring gear 44 of the first gear set 40 via the second gear set 50 as it is, The signal is also input to the sun gear 41 of the first gear set 40 via the gear set 60 and the second gear set 50, and the rotation of the input shaft 4 is accelerated and output from the carrier 43 of the first gear set 40 to the output gear 7.

  At the sixth speed, the second clutch 20 and the second brake 80 are engaged, and the rotation of the input shaft 4 is input to the ring gear 44 of the first gear set 40 via the second gear set 50 as it is, It is also input to the sun gear 41 of the first gear set 40 via the gear set 50, and the rotation of the input shaft 4 is increased at a speed increasing ratio larger than the fifth speed, and the output gear from the carrier 43 of the first gear set 40. 7 is output.

  At the reverse speed, the first brake 70 and the third brake 90 are engaged, and the rotation of the input shaft 4 is input to the sun gear 41 of the first gear set 40 via the third gear set 60 and the second gear set 50. . At this time, when the rotation direction is reversed in the second gear set 50, rotation in the direction opposite to the rotation direction of the input shaft 4 is output from the carrier 43 of the first gear set 40 to the output gear 7.

  As described above, the two clutches 10 and 20 disposed on the input side, the three single pinion type planetary gear sets 40, 50, 60, and the speed change mechanism 30 including the three brakes 70, 80, 90 are provided. Thus, the automatic transmission 1 capable of six forward speeds and reverse speeds is realized.

  From here, the assembly method of the automatic transmission according to the present invention will be described. In this specification, “spline engagement” means that the spline teeth formed on one inner peripheral surface mesh with the spline teeth formed on the other outer peripheral surface.

  FIG. 3 shows a state in which all parts are incorporated in the transmission case 5. This is completed by assembling a plurality of subassemblies in advance and combining the subassemblies.

  4 shows a subassembly in which three brakes 70, 80, 90, three gear sets 40, 50, 60 and an output gear 7 are incorporated in the main body 5a and the end cover 5c of the transmission case 5. Corresponding to the “first assembly body” described in the above.) SA1 is shown.

  The assembly method of the subassembly SA1 will be briefly described. From the opening on the end cover side to the main body 5a with the end cover 5c removed, the gear sets 40 and 50, the brake 70, the one-way clutch 100, the thrust bearing, and the like. A plurality of parts are incorporated. The sun gear 41 of the gear set 40 and the sun gear 51 of the gear set 50 have a common cylindrical shape in which teeth that mesh with the pinions 42 and 52 of both gear sets 40 and 50 are formed on the outer peripheral surface, and spline teeth are formed on the inner peripheral surface. It is comprised by the connection member 110 of this.

  Next, the gear set 60 (including the ring gear 54 of the gear set 50 integrated with the carrier 63), the brakes 80 and 90, and the end cover 5c assembled with the radial bearing 112 are assembled into the main body 5a.

  Then, the output gear 7 and the thrust bearing 114 are assembled on the side opposite to the end cover of the output gear 7 in the main body 5a in which all parts are assembled between the intermediate wall 5d and the end cover 5c. Thereby, the subassembly SA1 is completed.

  FIG. 5 shows a subassembly (corresponding to a “second assembly body” recited in the claims) SA2 in which two clutches 10 and 20 are assembled to the input shaft 4. The clutch 10 is assembled in a state where the clutch 20 is disposed inside the clutch 10.

  The assembly method of the subassembly SA2 will be briefly described. First, a cylindrical connecting member that is spline-engaged between the large diameter portion (the largest diameter portion) 4a of the input shaft 4 and the inner peripheral surface of the end cover side end portion. 116, and the inner peripheral end of the drum 12 as an input member of the clutch 10 is joined to the opposite end cover side end of the connecting member 116 by, for example, welding.

  Next, in the drum 12 joined to the connecting member 116, the piston 14 that presses the plurality of friction plates 13 of the clutch 10, the return spring 15 that biases the piston 14 in the anti-fastening direction, and the piston 14 are centrifuged. A seal plate 16 that forms a balance chamber and receives an end of the return spring 15 on the side opposite to the piston is disposed in order, and then an inner peripheral end of the drum 22 that is an input member of the clutch 20 is joined to the connecting member 116. As a result, the piston 14, the return spring 15, and the seal plate 16 are integrated without dropping from the connecting member 116.

  Subsequently, the drum 22 joined to the connecting member 16 is centrifuged between the piston 24 that presses the plurality of friction plates 23 of the clutch 20, the return spring 25 that urges the piston 24 in the anti-fastening direction, and the piston 24. A seal plate 26 that forms a balance chamber and receives the end of the return spring 25 on the side opposite to the piston is disposed in order, and then a snap ring 27 is attached to the end cover side end of the connecting member 116. Thereby, the piston 24, the return spring 25, and the seal plate 26 are integrated without dropping from the connecting member 116.

  The plurality of friction plates 13 of the clutch 10 are spline-engaged with the drum 12 (at this time, friction plates that are not to be spline-engaged with the drum 12 are alternately arranged) and a snap ring 17 is attached. Then, the plurality of friction plates 23 of the clutch 20 are spline-engaged with the drum 22 (at this time, friction plates which are spline-engaged with the drum 22 and friction plates which are not splined are alternately arranged) and the snap ring 28 is attached. To do. Accordingly, the plurality of friction plates 13 and 23 are also integrated with the connecting member 116.

  The input shaft 4 is inserted into the connecting member 116 and the large-diameter portion 4a is spline-engaged with the inner peripheral surface at the end cover side end of the connecting member 116, and then the output members of the two clutches 10 and 20 are engaged. By engaging 11 and 21, the subassembly SA2 is completed.

  The output members 11 and 21 will be described in detail. The output member 21 of the clutch 20 on the inner peripheral side includes a plurality of friction plates 23 (strictly, friction plates that are not spline engaged with the drum 22) and splines on the outer periphery. A large-diameter cylindrical portion 21a that functions as a hub to be engaged and a small-diameter cylindrical portion 21b that is fitted to a portion closer to the end cover than the large-diameter portion 4a of the input shaft 4 are configured. Further, an engaging portion 21c that is spline-engaged with the carrier 53 of the gear set 50 is formed on the outer periphery of the tip of the small-diameter cylindrical portion 21b (see FIG. 4). Further, two bushes 21d are mounted on the inner peripheral surface of the small-diameter cylindrical portion 21b so that the input shaft 4 can rotate without rattling (the input shaft 4 is fitted into these bushes 21d. ).

  On the other hand, the output member 11 of the clutch 10 on the outer peripheral side is a large-diameter cylindrical portion that functions as a hub that splines engages with a plurality of friction plates 13 (strictly, friction plates that are not spline engaged with the drum 12) on the outer periphery. 11a and the shape provided with the small diameter cylindrical part 11b fitted to the outer periphery of the small diameter cylindrical part 21a of the clutch 20. Further, an engaging portion 11c that is spline engaged with the connecting member 110 that is the sun gear 41 of the gear set 40 and the sun gear 51 of the gear set 50 is formed on the outer periphery of the tip of the small-diameter cylindrical portion 11b. Further, two bushes 11d are mounted on the inner peripheral surface of the small diameter cylindrical portion 11b so that the output member 21 can rotate without rattling with respect to the small diameter cylindrical portion 21b. It is inserted into the bush 11d).

  The output member 11 of the clutch 10 and the output member 21 of the clutch 20 are spline-engaged with the corresponding friction plates, and the output member 21 is only fitted to the input shaft 4 and the output member 11 is fitted to the output member 21. Therefore, when the axial direction is directed vertically so that the end portion 4b on the end cover side of the input shaft 4 faces downward, the input shaft 4 falls off. On the other hand, since the other components of the clutches 10 and 20 are integrated with the connecting member 116 as described above, they do not fall off. Therefore, as described later, when the subassembly SA2 is combined with the subassembly SA1, it is necessary to prevent the two output members 11 and 21 from falling off.

  FIG. 6 shows a subassembly SA3 that serves as a front wall 5b of the transmission case 5 and is also a unit of the oil pump 6.

  The subassembly SA3 (oil pump unit) includes an oil pump housing 120, an oil pump cover 122, an external gear 124 disposed in a space formed between the oil pump housing 120 and the oil pump cover 122, And an internal gear 126.

  The oil pump housing 120 includes a cylindrical portion 120a that supports the input shaft 4, and a flange portion 120b that extends in the radial direction from the center of the cylindrical portion 120a and serves as a front-side wall 5b of the transmission case 5. It is configured. A radial bearing 128 that supports the input shaft 4 is mounted on the inner peripheral surface of the cylindrical portion 120a.

  From here, a method of combining the three subassemblies SA1 to SA3 will be described.

  First, as shown in FIG. 7, the input shaft 4 is spline-engaged with a connecting member 116 in which components such as the drums 12 and 22 except the output members 11 and 21 of the two clutches 10 and 20 are incorporated. The small diameter cylindrical portion 21b of the output member 21 of the clutch 20 is fitted from the end cover 4b side on the end cover side. At this time, since the small diameter cylindrical portion 21b is guided by the input shaft 4, the output member 21 does not wobble in the radial direction, and further moves without rattling when the input shaft 4 is fitted into the bush 21d. Accordingly, the large-diameter cylindrical portion 21a of the output member 21 can move toward the inner peripheral side of the plurality of friction plates 23 without hesitation, and can easily be splined with the plurality of friction plates 23.

  Next, as shown in FIG. 8, the small diameter cylindrical portion 11b of the output member 11 of the clutch 10 is fitted to the outer periphery of the small diameter cylindrical portion 21b of the output member 21 of the clutch 20 from the end portion 4b side on the end cover side. To do. At this time, since the small diameter cylindrical portion 11b of the output member 11 is guided by the small diameter cylindrical portion 21b of the output member 21 of the clutch 20, the small diameter cylindrical portion 21 is fitted into the bush 11d without being wobbling in the radial direction. Then move without rattling. Accordingly, the large-diameter cylindrical portion 11a of the output member 11 can move toward the inner peripheral side of the plurality of friction plates 13 without hesitation, and can easily be splined with the plurality of friction plates 13.

  As shown in FIGS. 7 and 8, after the output members 11 and 21 of the two clutches 10 and 20 are fitted together and the assembly of the subassembly SA2 is completed, the end portion 4b on the end cover side of the input shaft 4 is positioned downward. The subassembly SA2 is placed in a posture in which the axial direction is vertically oriented. At this time, as shown in FIG. 5, if the output member 11 is supported from below, the output member 21 is supported from below by the output member 11, and the large-diameter portion 4 a of the input shaft 4 is supported from below by the output member 21. Since the connecting member 116 is placed on the output member 21, for example, the output member 11 is placed on the opening edge of the cylindrical jig J as shown in FIG. Strictly speaking, a disk-shaped connecting portion 11e that connects the large-diameter cylindrical portion 11a and the small-diameter cylindrical portion 11b of the output member 11 shown in FIG. 5 is placed on the opening edge.

  Next, as shown in FIG. 10, the end cover 5c is lowered as shown in FIG. 4 while supporting the output member 11 in the subassembly SA2 from below by the conveying means C (details will be described later). It is moved onto the subassembly SA1 placed with its axial direction oriented vertically. At this time, the central axes of both assemblies are made to be the same straight line.

  The transport means C is an example of a means for transporting the subassembly SA2, but its configuration will be briefly described. The transport means C includes a plurality of claws C1 that support the output member 11 of the subassembly SA2 from below, and includes the claws C1. Each is provided at the tip of the arm C2. Further, as shown in FIG. 9, the arm C2 is configured to be movable so that the claws C1 move away from each other. Further, the claw C1 is configured to be rotatable around a rotation center line that coincides with the extending direction of the arm C2.

  Subsequently, the subassembly SA2 is lowered by the conveying means C to enter the subassembly SA1, and will be described with reference to FIGS. 4 and 5 together with FIG. The intermediate wall 5d is inserted into the end cover 5c side, the tip 4b of the input shaft 4 is fitted to the radial bearing 112, and the engagement portion 4c formed adjacent to the tip 4b of the input shaft 4 and the gear set 60 The sun gear 61 is spline engaged, the engaging portion 21c of the output member 21 of the clutch 20 and the carrier 53 of the gear set 50 are spline engaged, and the engaging portion 11c of the output member 11 of the clutch 10 and the connecting member 110 are connected. Engage with spline.

  At this time, the subassembly SA2 is lowered while rotating the input shaft 4 and / or rotating the output member 11 via the conveying means C so as to facilitate the spline engagement.

  Then, when the subassembly SA2 is lowered to the lowest position, as shown in FIG. 12, the claw C1 of the conveying means C is rotated around the rotation center line that coincides with the extending direction of the arm C2, and the claw C1 is moved. The subassembly SA2 is released from the transport means C by being separated from the subassembly SA2. Then, the subassemblies SA1 and SA2 are combined.

  After that, after the conveying means C is detached from above the subassemblies SA1 and SA2, the subassembly SA3 shown in FIG. 6 is mounted on the input shaft 4 of the subassembly SA2 in the cylindrical portion 120a of the oil pump housing 120. Is inserted into the radial bearing 128 (see FIG. 5) and combined with the subassemblies SA1 and SA2. As a result, the automatic transmission 1 (portion excluding the torque converter 3) shown in FIG. 3 is assembled.

  According to the present embodiment, the whole of the two clutches 10 and 20 is assembled to the input shaft 4 in advance to form the assembly SA2, and the assembly SA2 is assembled to the transmission case 5 with the planetary gear sets 40, 50, and 60 assembled. Since it is united with the assembly SA1, the drums 12 and 22 of the two clutches 10 and 20 are connected to the input shaft 4 via the connecting member 116, and a plurality of friction plates 13 and 23 are assembled to these drums 12 and 22, respectively. In this state, the output members 11 and 22 of both clutches 10 and 20 can be sequentially engaged with a plurality of friction plates of the corresponding clutches. As compared with the case where the two output members 11 and 21 are simultaneously engaged with the plurality of friction plates 13 and 23 assembled to the drums 12 and 22 of the two clutches 10 and 20, respectively, the assembling work is facilitated.

  Although the present invention has been described with reference to the above-described embodiment, the present invention is not limited to this.

  For example, in the case of the above-described embodiment, the subassembly SA2 including the input shaft 4 and the two clutches 10 and 20, the plurality of planetary gear sets 40, 50, 60, and the like are incorporated in the main body 5a of the transmission case 5. The subassembly SA1 is united in a state where the axial direction is directed vertically, but is not limited thereto. For example, the axial direction may be horizontal. In this case, it is not necessary to use the conveying means C that supports the output member 11 of the clutch 10 in the subassembly SA2 shown in FIGS.

  As in the above-described embodiment, the sub assembly SA2 including the input shaft 4 and the two clutches 10 and 20, the plurality of planetary gear sets 40, 50, 60, and the like are incorporated in the main body 5a of the transmission case 5. When the assembly SA1 is united with the axial direction oriented vertically, the jig (conveying means) used at this time is not limited to the conveying means C as shown in FIGS. When the subassembly SA2 is moved toward the subassembly SA1 and united, it has supporting means (in the above case, the pawl C1) that supports the output member 11 of the clutch 10 of the subassembly SA2 from falling out. Any means (conveying means) may be used as long as the supporting means can escape from the transmission case after the union.

  As described above, according to the present invention, in an automatic transmission in which output members of two clutches are connected to components of different planetary gear sets, it is possible to reduce spline engagement between target members at a plurality of locations at the same time during assembly. Assembling work can be facilitated. Therefore, it may be suitably used in the field of automobile transmissions.

1 is a skeleton diagram of a transmission according to an embodiment of the present invention. 2 is a fastening table of the automatic transmission of FIG. 1. It is sectional drawing of the part of the automatic transmission with which the assembly method which concerns on this invention is implemented. It is sectional drawing of the subassembly containing a planetary gear set. It is sectional drawing of the subassembly containing an input shaft and two clutches. It is sectional drawing of the subassembly containing an oil pump. It is a figure for demonstrating the assembly process of the subassembly which consists of an input shaft and two clutches. It is a figure for demonstrating the process following the process shown in FIG. It is a figure for demonstrating the process of uniting the subassembly containing an input shaft and two clutches with the subassembly containing a planetary gear set. It is a figure for demonstrating the process following the process shown in FIG. It is a figure for demonstrating the process following the process shown in FIG. It is a figure for demonstrating the process following the process shown in FIG.

Explanation of symbols

4 Input shaft 10 Clutch 11 Output member 11b Cylindrical part (small diameter cylindrical part)
20 Clutch 21 Output member 21b Cylindrical part (small diameter cylindrical part)
SA2 second assembly (subassembly)

Claims (5)

A transmission case having a front wall, a rear wall, and an intermediate wall provided between the two walls, at least the front wall being separated from the other parts;
Two clutches disposed between a front wall and an intermediate wall of the transmission case, each having an input member, an output member, and a plurality of friction plates alternately engaged with the two members;
A planetary gear set disposed between an intermediate wall and a rear wall of the transmission case;
An input shaft that is disposed at the center of the two clutches and the planetary gear set, connected to the input member of the two clutches on the front wall side, and connected to the planetary gear set on the rear wall side; and
A cylindrical portion extending from the intermediate wall to the rear wall side in a state fitted to the input shaft is provided on the output members of the two clutches,
An assembly method of an automatic transmission in which these cylindrical portions are connected to the planetary gear set,
A first assembly body forming step of forming a first assembly body in which a planetary gear set is incorporated between an intermediate wall and a rear wall of the transmission case with the front wall of the transmission case removed;
A second assembly body forming step of assembling the two clutches on the input shaft to form a second assembly body comprising the input shaft and the two clutches;
After both the steps, the rear wall portion of the input shaft of the second assembly body and the cylindrical portion of the output member of the two clutches are inserted through the intermediate wall of the transmission case to the rear wall side. Combining the two assembly bodies by connecting to the planetary gear set in the first assembly body;
An automatic transmission comprising: a front wall coupling step of inserting a front wall side portion of the input shaft into the front wall and coupling the front wall to another portion of the transmission case after the combining step; Assembly method. The method of assembling an automatic transmission according to claim 1.
The two clutches are arranged inside and outside at substantially the same position in the axial direction, and the cylindrical part of the output member of the first clutch arranged outside is the outer periphery of the cylindrical part of the output member of the second clutch arranged inside. The cylindrical portion of the output member of the second clutch is configured to be fitted to the outer periphery of the input shaft,
In the second assembly body forming step, the input members of the first and second clutches are connected to the input shaft, and a plurality of friction plates are assembled to the input members,
First, while fitting the cylindrical portion of the output member of the second clutch to the input shaft, the output member is engaged with the friction plate of the second clutch,
Then, the output member of the first clutch is engaged with the friction plate of the first clutch while fitting the cylindrical portion of the output member of the first clutch with the cylindrical portion of the output member of the second clutch. Assembling method of transmission. The assembly method of the automatic transmission according to claim 2,
In the second assembly body forming step,
When fitting the cylindrical portion of the output member of the second clutch to the input shaft, the input shaft is fitted into the bearing member mounted on the inner peripheral surface of the cylindrical portion,
When the cylindrical portion of the output member of the first clutch is fitted to the cylindrical portion of the output member of the second clutch, the second clutch is attached to the bearing member mounted on the inner peripheral surface of the cylindrical portion of the first clutch. A method for assembling an automatic transmission, comprising inserting a cylindrical portion of the automatic transmission. In the assembly method of the automatic transmission according to claim 2 or 3,
The portion where the input members of the first and second clutches of the input shaft are connected is configured to have a larger diameter than the portion where the cylindrical portions of the output members of both clutches are fitted,
In the coalescence process,
Install the first assembly body with the axial direction vertical so that the rear wall side is down,
Above that, holding the second assembly body by locking the output member of the first clutch with a jig, with the axial direction also oriented vertically.
An assembly method for an automatic transmission, wherein the second assembly body is lowered from this state so that the second assembly body is combined with the first assembly body. In the assembly method of the automatic transmission according to any one of claims 1 to 4,
In the combining step, the tip of the input shaft in the second assembly body is fitted to a bearing member mounted on the rear wall of the transmission case constituting the first assembly body,
The method of assembling an automatic transmission, wherein, in the front wall coupling step, a portion of the input shaft on the front wall side is inserted into a bearing member mounted on the front wall.

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