JP3688470B2 - Automatic transmission assembly structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an assembly structure of an automatic transmission, and more particularly to an assembly structure of an automatic transmission capable of press-fitting a support member into a transmission case without applying a force to an output gear.
[0002]
[Prior art]
As a speed change mechanism of the automatic transmission, for example, a part of the structure shown in FIG. 5 is used. Two rows of planetary gears 2 and 3 are installed around the main shaft 1 supported by the transmission case 20. The gear is provided with a connecting member so that transmission of driving force and shift control are performed.
[0003]
The connecting member is formed like a drum 8, for example, and a friction element such as a clutch or a brake for speed change control is installed therein. A hydraulic mechanism for operating these friction elements is also installed. An oil passage 54 communicating with the hydraulic mechanism and an oil passage 53 for lubricating the drum 21 are formed in the drum support 21 and connected to a pump (not shown) from the partition wall 17. The oil passage 53 is formed in the same manner as the oil passage 54 and is opened to a support surface that supports the drum 8. The driving force shifted by the operation of the friction element is transmitted to the next gear by the output gear 60.
[0004]
Although the speed change mechanism has a large number of parts and a complicated structure, the structure is required to be easily assembled. Therefore, a part is used in advance as an assembly set. In FIG. 5, the drum support 21 that supports the drum 8 and the output gear 60 are configured as an output gear set.
In this set, the outer race 24 and the inner races 33 and 41 are press-fitted on the inner periphery of the drum support 21 and the outer periphery of the shaft 34 of the output gear 60, respectively, and the washer is fitted with two rows of rollers sandwiched between them. The nut 43 is tightened and assembled. The set is inserted into a mounting portion 18 formed on the partition wall 17 of the transmission case 20 and fixed with a bolt or the like.
[0005]
[Problems to be solved by the invention]
However, in order to form the oil passages 53 and 54, it is necessary to form a crimping force on the contact surfaces where the respective oil passages of the drum support 21 and the partition wall 17 are opened. Will do.
In the conventional speed change mechanism, a force cannot be directly applied to the drum support 21 blocked by the output gear 60. Therefore, a force is applied to the output gear 60, and the drum support 21 is press-fitted into the partition wall 17 by the transmission of the force. It is designed to generate a crimping force. However, the output gear 60 has a large diameter, and even a minute deformation is enlarged at the tooth portion. Therefore, there is a problem that the deformation when the force is applied may interfere with the transmission of the driving force.
In view of the above problems, an object of the present invention is to provide an automatic transmission assembly structure that can press-fit an output gear set into a transmission case without deforming the output gear.
[0006]
[Means for Solving the Problems]
Therefore, the present invention has a structure in which the output gear is supported on the partition wall of the transmission case, and the output gear is supported by a bearing including an outer race fixed to the partition side and an inner race fixed to the output gear side. In the assembly structure of the automatic transmission , a support member having a cylindrical portion in which the outer race of the bearing is fixed to the inner peripheral side, a disc flange portion having outer teeth on the outer periphery, and the disc flange portion The boss portion extending in the axial direction from the inner peripheral side, and the output gear in which the inner race of the bearing is fixed to the outer peripheral surface of the boss portion are assembled in advance so that the inner race and the outer race are coupled as a bearing. Forming a coupling structure, forming a through hole on the flange surface of the disc flange portion so as to face the side surface of the support member, and the coupling structure, By pressing the support member through the serial through-hole and shall be pressed into the mounting portion of the partition wall of the transmission case.
[0007]
[Action]
In the present invention, since the through hole is formed on the surface facing the support member of the output gear, the partition wall and the support member are pressed and fixed by applying force directly from the outside of the partition wall to the support member through the through hole. A large crimping force can be generated on the contact surface, and the output gear can be prevented from being deformed.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a view showing a part of a speed change mechanism according to this embodiment. 2 and 3 are views showing the structure of the output gear and the drum support (support member). FIG. 4 is a diagram showing a configuration of an output gear set (combined structure) in which the output gear is assembled to the drum support.
[0009]
First, the structure of the transmission mechanism will be described with reference to FIG. In the transmission case 20, two rows of planetary gears 2 and 3 are arranged on the outer periphery of the main shaft 1 connected to a torque converter (not shown). The sun gear 4 of the planetary gear 2 is connected to a friction element (not shown). The carrier plate 7 that supports the pinion gear 5 is connected to the one-way clutch 15. The end portion of the drum portion on the outer periphery of the carrier plate 7 is splined, and the end portion of the drum 8 is engaged and connected thereto.
[0010]
The planetary gear 3 is configured such that the sun gear 9 is connected to the main shaft 1 and receives a driving force. The pinion gear 10 is connected to the ring gear 11 of the planetary gear 2 by the carrier plate 6. The ring gear 12 of the planetary gear 3 can be connected to the drum 8 by a clutch 13. The drum 8 is rotatably supported by a drum support 21 and can be fixed to the transmission case 20 by a brake 14. Each of the clutch 13 and the brake 14 is provided with a hydraulic mechanism.
[0011]
The drum support 21 has an assembly ring portion 16 for assembling the transmission case 20 to the partition wall 17, and an attachment portion 18 for accommodating the assembly ring portion 16 is formed on the partition wall 17.
The outer diameter of the assembly ring portion 16 and the inner diameter of the attachment portion 18 are set so as to have a press-fitting relationship when the assembly ring portion is accommodated.
[0012]
The drum support 21 and the partition wall 17 are fixed by bolts 19 in a state where the assembly ring portion 16 is accommodated in the attachment portion 18. Two oil passages are respectively formed in the partition wall 17 and the drum support 21. The oil passage opens to the inner diameter surface of the partition mounting portion 18 and the outer diameter surface of the assembly ring portion 16 and is connected to the connection surface to form oil passages 53 and 54.
[0013]
The outer race 24 of the bearing is fixed to the center of the drum support 21, and the shaft 34 can be rotated to the drum support 21 by coupling with the inner races 33 and 41 that are press-fitted into the shaft (boss) 34 of the output gear 31 by the nut 43. It is supported by. A shaft 34 extends inward of the partition wall 17 and engages with a carrier plate 47 of the planetary gear 3 at a splined end. A through hole 32 for press-fitting the drum support 21 is formed in the output gear 31.
The gear path is formed as described above, and the driving force transmitted to the sun gear 9 is shifted by the operation of the friction element and transmitted from the output gear 31 to the outside of the partition wall 17.
[0014]
Next, the assembly of the output gear set to the transmission case partition will be described.
FIG. 2 is a diagram showing details of the configuration of the drum support 21.
Two non-penetrating holes 28 and 29 are formed in the drum support 21 inward from the outer diameter portion 22 of the assembly ring portion 16. On the other hand, holes 26 and 30 are formed in the axial direction from the end surface A of the drum support. The holes 26 and 30 are formed in the oil passage so as to intersect with the holes 29 and 28, respectively. Oil passages 53 and 54 communicating with the outside of the transmission case 20 are formed by connection between the oil passage and the oil passage formed in the partition wall. The outer ends of the holes 30 and 26 are closed by press-fitting the ball 23. The insides of the other ends of the holes 26 and 30 are opened to a support portion 27 that supports the drum 8 and a connection portion 25 that is connected to the hydraulic mechanism.
An outer race 24 is press-fitted into the inner periphery of the drum support 21 and a snap ring 25 is fitted.
[0015]
On the other hand, as shown in FIG. 3, the output gear 31 has three through holes 32 formed at equal intervals on an end face 36 facing the drum support. A through hole 35 is formed on the inner periphery of the inner hole to remove the inner race with a diameter smaller than that of the through hole 32. The shaft 34 is formed with a hole 37 through which the main shaft 1 passes at the center, and the outer periphery is formed with a male screw 57 at the center and a spline 58 at the end.
The inner race 33 having the roller 38 is press-fitted into the outer periphery of the shaft 34 and attached to the output gear 31. The output gear 31 having the inner race 33 is attached to the drum support 21 by fitting the shaft 34 to the drum support 21, further inserting the inner race 41, and tightening the nut 43.
[0016]
FIG. 4 is a diagram showing the attached state. That is, the shaft 34 is inserted from the outside of the drum support 21 so that the roller 33 is seated on the outer race 24. Next, an inner race 41 having a roller 39 is inserted into the shaft 34 from the inside of the drum support 21 to the outside, and the drum support 21 is fastened and attached using a nut 43 with a washer 42 fitted. In this way, the drum support 21 and the output gear 31 are configured in an output gear set that is fixed in the axial direction and can rotate in the circumferential direction.
[0017]
When this output gear set is assembled to the transmission case 20, the drum support 21 is inserted into the attachment portion 18 of the partition 17 of the transmission case and press-fitted using a jig. As shown in FIG. 4, the jig 50 is a disc-shaped member having three legs 51 corresponding to the through holes 32 of the output gear 31 so that the tips of the legs 51 come into contact with the end surface A of the drum support. Is set to A force is applied from the outside with the foot 51 inserted into the through hole 32 of the output gear 31. Thereby, the assembly ring portion 16 of the drum support 21 is press-fitted into the partition attachment portion 18. Thereafter, it is fixed with a bolt 19. As a result, a crimping force is formed between the assembly ring portion 16 and the partition wall 17, and the connection of the oil passages 53 and 54 is completed.
The present embodiment is configured as described above, and when the drum support 21 is pressure-bonded to the output gear 31, a through hole 32 is formed through which the foot of the jig passes. Therefore, the transmission case with the drum support 21 and the output gear 31 as a set is formed. Even if assembled to 20, the force can be directly applied to the drum support, and the output gear is not deformed.
[0018]
【The invention's effect】
In the present invention, a force is applied to the support member through a through-hole formed in the flange of the output gear to press-fit and fix the partition wall, so that a large crimping force can be generated on the contact surface between the partition wall and the support member. The effect that the output gear is not deformed is obtained.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a transmission mechanism for explaining an embodiment.
FIG. 2 is a diagram showing a configuration of a drum support.
FIG. 3 is a diagram illustrating a configuration of an output gear.
FIG. 4 shows an assembled state of the output gear set.
FIG. 5 is a diagram illustrating a conventional example.
[Explanation of symbols]
1 Spindle 2, 3 Planetary gear 4, 9 Sun gear 5, 10 Pinion gear 6, 7 Carrier plate 8 Drum
11, 12 Ring gear 13 Clutch 14 Brake 15 One-way clutch 16 Assembly ring portion 17 Bulkhead 18 Mounting portion 19 Bolt 20 Transmission case 21 Drum support 22 Outer diameter portion 23 Ball 24 Outer race 25 Connection surface 27 Support surface 26, 30 Hole 28 , 29 Hole 31, 60 Output gear 32, 35 Through hole 33, 41 Inner race 34 Shaft 36 End face 38, 39 Roller 42 Washer 43 Nut 50 Jig 51 Foot 53, 54 Oil passage 57 Male thread 58 Spline 70 Inner race 80 Outer Race A end face

Claims (1)

An output gear is supported by a partition wall of a transmission case, and the output gear is an automatic transmission supported by a bearing including an outer race fixed to the partition wall side and an inner race fixed to the output gear side. In the assembly structure,
A support member having a cylindrical portion in which the outer race of the bearing is fixed to the inner peripheral side;
The output gear comprising a disc flange portion provided with external teeth on the outer periphery and a boss portion extending in the axial direction from the inner periphery side of the disc flange portion, wherein the inner race of the bearing is fixed to the outer peripheral surface of the boss portion And
Assemble in advance so that these inner race and outer race are combined as bearings to form a combined structure,
A through hole is formed on the flange surface of the disc flange portion so as to face the side surface of the support member, and the coupling structure is pressed through the through hole to press the support member, thereby attaching the partition portion of the transmission case. An assembly structure of an automatic transmission, characterized by being press-fitted into.

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