JP2000046159A - Planetary gear device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reliably prevent slipping-out of a pin, prevent the occurrence of strain in a carrier, and enhance disassembling performance by fixing a first shaft by inserting the pin into a pin hole, and arranging the abutting part for preventing slipping-out of the pin in a carrier cover installed on a carrier. SOLUTION: A first shaft 10 is fixed by inserting a pin 17 into a pin hole 10a, and the abutting surface for preventing slipping-out of the pin 17 is arranged in a carrier cover 20. Thus, slipping-out force to the pin 17 is supported on the abutting surface of the carrier cover 20 to reliably prevent slipping-out of the pin 17. Since the pin 17 is only inserted into a pin hole 10a of a carrier 4c and a pin hole 10a of a first shaft 10, an unreasonable load does not act on the carrier 4c and the first shaft 10, so that strain is not caused. Since the pin 17 can be pulled out in the outside diameter direction, the first shaft 10 can be easily disassembled from the carrier 4c so as to improve disassembling performance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a planetary gear device used for an automatic transmission for a vehicle, and more particularly to a Ravigneaux type planetary gear device, and more particularly to a mounting structure of a shaft for rotatably supporting a planetary gear to a carrier.

[0002]

2. Description of the Related Art Conventionally, in the case of an automatic transmission using a planetary gear mechanism, a component called a carrier is used to rotatably support a planetary gear. Generally, carriers
Bearings are provided for fitting and supporting both ends of a shaft that rotatably supports a planetary gear. However, it is necessary to prevent rotation of the shaft with respect to the carrier and to restrict axial movement of the shaft. .

For this reason, in the prior art, Japanese Utility Model Laid-Open No. 2-5055
As described in Japanese Patent Laid-Open Publication No. 1 (1999) -2002, a screw hole is formed in the bearing portion of the carrier from the radially outer peripheral side to penetrate the shaft, and the screw is screwed into this screw hole to prevent rotation of the shaft and move in the axial direction. Are known. Also,
In some cases, a roller pin is used instead of a screw, the roller pin is inserted from the outer diameter direction of the carrier, and a part of the carrier is caulked to prevent the roller pin from coming off.

[0004]

However, when a screw is used, it takes time and effort to machine the screw hole, and special measures are required to prevent the screw from being loosened. In addition, when a roller pin is used, the carrier is liable to be distorted due to caulking, causing wear, and once assembled, there is a disadvantage that it cannot be disassembled.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a planetary gear device which reliably prevents a pin from coming off, improves reliability, does not generate distortion in a carrier, and is excellent in disassembly. .

[0006]

In order to achieve the above object, the present invention provides a first and second planetary gears meshing with each other supported by a carrier, and both planetary gears mesh with first and second sun gears, respectively. In addition, in the planetary gear device in which the first planetary gear meshes with the ring gear, a bearing portion that fits and supports both ends of the first and second shafts that rotatably supports the first and second planetary gears on the carrier is provided. Provided, first
A radial pin hole opened on the outer peripheral side is provided in a bearing portion of a carrier that supports one end of the shaft, and a radial pin hole corresponding to the pin hole is provided at one end of the first shaft,
A pin is inserted into the pin hole to fix the first shaft in the axial direction and the rotating direction with respect to the carrier, and a carrier cover is attached to one axial end of the carrier.
A planetary gear device characterized in that the carrier cover is provided with a contact surface for contacting the outer peripheral end of the pin to prevent the pin from coming off.

[0007] One end of the first shaft is inserted into a bearing portion of the carrier, and pins are inserted into the pin hole of the carrier and the pin hole of the first shaft from the outer diameter side of the carrier. When the carrier cover is attached to one end of the carrier after inserting the pin, the contact surface of the carrier cover covers the outer peripheral end of the pin. When the carrier rotates, the pins inserted into the pin holes try to pull out in the outer diameter direction due to centrifugal force, but the contact surface of the carrier cover is in contact with the outer peripheral end of the pins, so make sure that the pins are securely Can be retained. Since the pins are only inserted into the pin holes of the carrier and the first shaft, an excessive load such as caulking does not act on the carrier or the first shaft, and does not generate distortion. Also,
If the carrier cover is removed from the carrier, the pins can be pulled out in the outer diameter direction, so that the first shaft can be easily disassembled from the carrier.

According to a second aspect of the present invention, a deformed section is provided at the other end of the second shaft, and is fitted to the other end of the first and second shafts between the first and second planetary gears and the carrier. A thrust washer having two fitting holes to be fitted is arranged, the fitting hole of the thrust washer fitted to the deformed cross-section of the second shaft is formed as a deformed hole, and one end of the second shaft is formed on the inner surface of the carrier cover. It is desirable that the support is provided so as not to be movable in the axial direction. That is, the second shaft may be fixed using a pin similarly to the first shaft, but the pin hole must be separately processed. Therefore, the second shaft is prevented from rotating using a washer having two fitting holes to be fitted to the first and second shafts, and the washer restricts axial movement to one side of the second shaft. The axial movement to the other is performed on the inner surface of the carrier cover. Thereby, the second shaft can be positioned without providing a pin hole or the like, and caulking can be eliminated.

[0009]

FIG. 1 shows a schematic configuration of an automatic transmission using a planetary gear device according to the present invention. This automatic transmission includes a torque converter 1, an input shaft 2, to which engine power is transmitted via the torque converter 1, three clutches C1 to C3, two brakes B1, B2, a one-way clutch F, a Ravigneaux type planetary gear. Device 4, output gear 5,
An output shaft 7, a differential device 8, and the like are provided.

The forward sun gear 4a of the planetary gear set 4
And the input shaft 2 are connected via a C1 clutch.
The rear sun gear 4b and the input shaft 2 are connected via a C2 clutch. The carrier 4c is connected to the intermediate shaft 3,
The intermediate shaft 3 is connected to the input shaft 2 via a C3 clutch. The carrier 4c is a B2 brake and a carrier 4c.
and c is connected to the transmission case 6 via a one-way clutch F that allows only forward rotation (engine rotation direction). The carrier 4c supports two types of pinion gears 4d and 4e, the forward sun gear 4a meshes with a long pinion (first planetary gear) 4d having a long shaft, and the rear sun gear 4b has a short pinion (second planetary gear) having a short shaft. ) Is in mesh with the long pinion 4d via 4e. Ring gear 4f that meshes only with long pinion 4d
Are connected to the output gear 5. The output gear 5 is an output shaft 7
Is connected to the differential device 8 via the. The automatic transmission implements four forward speeds and one reverse speed by operating the clutches C1, C2, C3, the brakes B1, B2, and the one-way clutch F.

FIGS. 2 to 6 show a specific structure of the planetary gear device 4. FIG. The long pinion 4 d is rotatably supported by a first shaft 10 via a needle bearing 11, and the short pinion 4 e is rotatably supported by a second shaft 12 via a needle bearing 13. As shown in FIGS. 3 and 6, the carrier 4c has bearing holes 14a, 14b and 15a for fitting and supporting both ends of the first shaft 10 and both ends of the second shaft 12, respectively.
15b are provided.

In a bearing hole 14a of the carrier 4c that supports one end of the first shaft 10, a radial pin hole 16 that is opened on the outer peripheral side is formed in an orthogonal direction. And
A pin hole 10a corresponding to the pin hole 16 is also formed at one end of the first shaft 10, and these pin holes 16, 10a
The roller pin 17 is inserted into the
The shaft 10 is fixed to the carrier 4c in the axial direction and the rotation direction.

A carrier cover 20 is attached to one end of the carrier 4c in the axial direction (the right end in FIG. 3). The carrier cover 20 is formed in a drum shape so as to cover the outer peripheral portion of the carrier 4, and includes a spline hub 21 with which a clutch plate of a B2 brake is engaged, and a one-way clutch F
And an inner ring portion 22 that constitutes the inner ring. Further, a screw insertion hole 23 is provided in a side wall portion of the carrier cover 20, and a flat head screw 24 inserted into the screw insertion hole 23 is screwed into a screw hole 18 (see FIG. 3) of the carrier 4c to thereby provide the carrier. The cover 20 is integrally fixed to the carrier 4c. On the inner peripheral surface of one end of the carrier cover 20, a contact surface 25 for positioning the outer peripheral end of the roller pin 17 to prevent the roller pin 17 from coming off is formed.

At the other end (left end in FIG. 3) of the second shaft 12, a modified cross section 12a having a part of the outer peripheral surface cut away is provided.
Is formed, and a thrust washer 30 having a modified hole 30a corresponding to the modified cross section 12a (see FIG. 5).
Are arranged on the inner surface of the carrier 4c. It should be noted that the shape of the modified cross section 12a may be any shape other than the circular shape. By fitting the deformed section 12a of the second shaft 12 into the deformed hole 30a of the thrust washer 30, the rotation of the second shaft 12 in the rotational direction and the leftward movement in the axial direction is restricted. The thrust washer 30 also has a circular hole 30b that fits into the end of the first shaft 10. The movement of the second shaft 12 to the right in the axial direction is restricted by the inner surface 26 at one end of the carrier cover 20. Therefore, the second shaft 12 is fixed in the rotation direction and the axial direction.

The thrust washer 30 slidably supports one end surfaces of the long pinion 4d and the short pinion 4e. The other end surface of the long pinion 4d is slidably supported by a thrust washer 31, and the other end surface of the short pinion 4e is slidably supported by a thrust washer 32.

An oil cover 33 is fitted on the outer surface of the carrier 4c. The oil cover 33 receives the oil flowing in the outer diameter direction along the outer surface of the carrier 4c and supplies the oil to the shaft center lubrication hole 10b of the first shaft 10. The oil that has entered the shaft center lubrication hole 10b lubricates the needle bearing 11 disposed between the first shaft 10 and the long pinion 4d.

To assemble the planetary gear device 4, first, a long pinion 4d and a short pinion 4e having needle bearings 11 and 13 inserted into the inner diameter portion are arranged in a carrier 4c, and the first shaft 10 and the second shaft 12 are connected. Long pinion 4d and short pinion 4e through bearing holes 14a, 14b and 15a, 15b
Through. In addition, the thrust washers 30 to 32 are arranged inside the carrier 4c in advance. Then, the pin hole 16 of the carrier 4c and the pin hole 10a of the first shaft 10 are formed.
By inserting the roller pin 17 into the first shaft 1
0 is fixed to the carrier 4c in the axial and rotational directions. On the other hand, the modified cross section 1 at one end of the second shaft 12
2a is fitted in the deformed hole 30a of the thrust washer 30, thereby positioning in the rotational direction and the axial direction.

After assembling the long pinion 4d and the short pinion 4e to the carrier 4c as described above, the carrier cover 20 is mounted on the carrier 4c. That is, the carrier cover 20 is fitted to the outside of the carrier 4c, and the flathead screw 24 is inserted into the carrier 4c through the screw insertion hole 23.
Screw holes 18. Thereafter, the flat head screw 24 is caulked around its head to prevent the flat head screw 24 from being loosened.
Thus, the carrier 4c and the carrier cover 20 are integrated. In this state, since the outer peripheral end of the roller pin 17 is prevented from coming off by the contact surface 25 of the carrier cover 20, the first shaft 10 is fixed in the rotation direction and the axial direction. Further, the other end of the second shaft 12 is also positioned on the inner side surface 26 of the carrier cover 20, so that the second
The shaft 12 is also fixed in the rotation direction and the axial direction. Thereafter, the ring gear 4f is engaged with the long pinion 4d, the intermediate shaft 3 is inserted into the center of the carrier 4c and the carrier cover 20, the forward sun gear 4a is engaged with the long pinion 4d, and the rear sun gear 4b is engaged with the short pinion 4e. Then, the assembly is completed.

If any failure occurs in the components constituting the planetary gear device 4, the carrier 4c and the carrier cover 20 can be disassembled simply by loosening the flat head screw 24. Therefore, the second shaft 12 can be easily removed from the carrier 4c, and the short pinion 4e can be easily disassembled. Further, the roller pin 17 is connected to the pin holes 16 and 1.
The first shaft 10 can be easily disassembled by extracting it from 0a, so that the long pinion 4d can be easily disassembled. Therefore, the planetary gear device 4 excellent in disassembly can be obtained.

In the planetary gear device 4 having the above structure, when the carrier 4c and the carrier cover 20 rotate integrally,
The centrifugal force causes the roller pin 17 inserted in the pin holes 16 and 10a to exert a pulling force in the outer diameter direction. However, since the contact surface 25 provided on the carrier cover 20 keeps the roller pin 17 from coming off. The first shaft 10 is securely fixed to the carrier 4c and the carrier cover 20 in the rotational direction and the axial direction.

In the above-described embodiment, an example has been described in which the roller pin 17 penetrates the first shaft 10 and extends over the bearing portion of the carrier 4a. However, the roller pin 17 has at least the rotation direction and the shaft of the first shaft 10. As long as the movement in the direction can be regulated, the length of the roller pin 17 may be shorter than in the embodiment. Therefore, the pin hole 10a of the first shaft 10 does not necessarily need to penetrate.

[0022]

As is apparent from the above description, according to the present invention, the bearing which fits and supports both ends of the first and second shafts which rotatably support the first and second planetary gears on the carrier. Providing a radial pin hole opened on the outer peripheral side in a bearing portion of a carrier that supports one end of the first shaft, and providing a pin hole corresponding to the pin hole at one end of the first shaft; Inserting a pin into the pin hole to fix the first shaft to the carrier in the axial and rotational directions,
Attach the carrier cover to one axial end of the carrier,
The carrier cover has a contact surface that locates the outer peripheral end of the pin and prevents the pin from coming off. I can stop it. Since the pins are only inserted into the pin holes of the carrier and the first shaft,
An excessive load such as caulking does not act on the carrier or the first shaft, and does not generate distortion. Therefore, occurrence of wear can be prevented. Further, if the carrier cover is removed from the carrier, the pins can be pulled out in the outer diameter direction, so that the first shaft can be easily disassembled from the carrier, and disassembly can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic mechanism diagram of an example of an automatic transmission for a vehicle according to the present invention.

FIG. 2 is a detailed sectional view of a planetary gear unit of the automatic transmission of FIG. 1;

FIG. 3 is a sectional view of only the planetary gear device of FIG. 2;

FIG. 4 is a right side view of the planetary gear device shown in FIG.

FIG. 5 is a sectional view taken along line VV of FIG. 3;

6 is an exploded sectional view of the planetary gear device shown in FIG.

[Explanation of symbols]

 Reference Signs List 4 planetary gear device 4c carrier 4d first planetary gear 4e second planetary gear 10 first shaft 10a pin hole 12 second shaft 16 pin hole 17 pin 20 carrier cover 25 contact surface 30 thrust washer

Claims (2)

[Claims] A planetary gear device in which first and second planetary gears meshing with each other are supported by a carrier, both planetary gears mesh with first and second sun gears, respectively, and the first planetary gear meshes with a ring gear. , Wherein the first and second planetary gears are rotatably supported on the carrier.
A bearing part for fitting and supporting both ends of the shaft is provided, a radial pin hole opened on the outer peripheral side is provided in a bearing part of a carrier for supporting one end of the first shaft, and the pin is provided at one end of the first shaft. A radial pin hole corresponding to the hole is provided, a pin is inserted into the pin hole to fix the first shaft in the axial direction and the rotational direction with respect to the carrier, and a carrier cover is provided at one axial end of the carrier. A planetary gear device, wherein the carrier cover is provided with an abutment surface for abutting against the outer peripheral end of the pin to prevent the pin from coming off. 2. A modified cross section is provided at the other end of the second shaft, and is fitted between the first and second planetary gears and the carrier at the other end of the first and second shafts. A thrust washer having two fitting holes is disposed, a fitting hole of the thrust washer that fits with the deformed cross section of the second shaft is a deformed hole, and one end of the second shaft is an inner surface of a carrier cover. The planetary gear device according to claim 1, wherein the planetary gear device is supported so as not to move in the axial direction.