JPH04316749A - Carrier for planetary gear mechanism - Google Patents

Abstract

PURPOSE:To reduce the cost and the size of the carrier of a planetary gear mechanism to support a short pinion and a long pinion. CONSTITUTION:A second support member 2 to pivotally support a short pinion A between a first support member 1 and the second support member is provided. The second support member 2 is molded in the shape of a cup having a peripheral wall part 4, a part of the peripheral wall part 4 is cut and rises, and a long pinion B is pivotally supported between a cut rise part 9 and the first support member 1. The second support member is additionally functioned as a support member for the long pinion, there is no need for a different support member for the long pinion, and the number of parts is reduced. This constitution reduces the cost and the size of a carrier.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a carrier used in a so-called Ravigneau type planetary gear mechanism, which includes a short pinion as a planetary gear and a long pinion that meshes with the short pinion.

0002

2. Description of the Related Art Conventionally, as a carrier of a planetary gear mechanism having two sets of planetary gears at one end and the other end in the axial direction, three discs have been used as a carrier, as seen in Japanese Utility Model Application Publication No. 121451/1983. A planetary gear on one end side is stacked in the axial direction with a cylindrical spacer interposed between the intermediate disk and the disk on one end side in the axial direction,
It is known that a planetary gear on the other end side is pivotally supported between an intermediate disk and a disk on the other end side in the axial direction. Applying this technology to the carrier of the Ravigneaux-type planetary gear mechanism,
As shown in FIG. 5, a first support member a at one axial end supports one end of each pinion shaft A1, B1 of short pinion A and long pinion B, and supports the other end of pinion shaft A1 of short pinion A. A second support member b is provided at an axially intermediate position, and a third support member c is provided at the other end in the axial direction, which supports the other end of the pinion shaft B1 of the long pinion B. It has also been considered to construct a carrier by welding the second support member b on the spacer leg piece a1 and the second support member b to the third support member c on the spacer leg piece b1 that is integrated therewith. A clutch inner d is welded to the third support member c, and the outer periphery of the clutch inner d is engaged with a disk of a clutch such as a brake for stopping rotation of the carrier.

0003

[Problems to be Solved by the Invention] As described above, if the carrier is constructed from three supporting members, the number of parts will increase, the number of welding points will increase, the manufacturing cost will increase, and the weight will increase. It is hoped that the number of points will be reduced. An object of the present invention is to provide a carrier in which the above-described second support member and third support member are integrated to reduce the number of parts.

0004

[Means for solving the problem] In order to achieve the above purpose,
The present invention relates to a carrier used in a planetary gear mechanism including a short pinion and a long pinion meshing with the short pinion as a planetary gear, the carrier being a carrier at one axial end that supports one end of each pinion shaft of the short pinion and the long pinion. a second support member at the center in the axial direction that supports the other end of the pinion shaft of the short pinion, and a third support member at the other end in the axial direction that supports the other end of the pinion shaft of the long pinion. In the second support member, a peripheral wall portion extending toward the other end in the axial direction is integrally formed, and a portion of the peripheral wall portion that matches the location where the long pinion is arranged is extended radially inward toward the other end in the axial direction. It is characterized in that the cut and raised portion constitutes the third support member.

[0005]

[Operation] The cut and raised portion formed by cutting and raising the peripheral wall portion of the second support member faces the first support member in the axial direction, so that the cut and raised portion is used as the third support member and the first support member. A long pinion can be pivotally supported between the support member and the support member.

[0006]

[Embodiment] In the illustrated embodiment, the present invention is applied to a carrier of a Ravigneaux type planetary gear mechanism that pivotally supports three short pinions A and three long pinions B meshing therewith. As shown in FIGS. 1 to 3, the carrier includes a first disc-shaped shaft that supports one end, that is, the right end of each pinion shaft A1, B1 of the short pinion A and long pinion B.
It comprises a support member 1 and a second support member 2 that supports the left end of the pinion shaft A1 of the short pinion A, and is positioned on the outer peripheral edge of the first support member 1 between the arrangement pitches of the long pinions B and extends to the left. A bent and extending leg piece 3 was integrally formed, and the first support member 1 was welded to the second support member 2 at the tip of the leg piece 3.

The second support member 2 is a cup-shaped press-formed material having a disk-shaped base portion 4, a peripheral wall portion 5, and a flange portion 6 at the tip of the peripheral wall portion, as shown in FIG. 4(a). As shown in FIG. 4(b), the outer circumferential portion of the base plate 4 that matches the location of the long pinion B is punched out to form a recessed notch 7 for receiving the long pinion B. At the same time, two cuts 8, 8 are made in the circumferential wall portion 5 in the generatrix direction to match the concave notch 7, and then the portion between the two cuts 8, 8 is made in the radial direction as shown in FIG. 4(c). A tongue-shaped cut-and-raised portion 9 flush with the flange portion 6 is formed by cutting it in the opposite direction. When the leg piece 3 of the first support member 1 is welded to the outer peripheral edge portion between the concave notches 7 of the proximal end portion 4 of the second support member 2, the cut-and-raised portion 9 is formed on the first support member 1. The cut-and-raised part 9 faces the support part of the long pinion B through the recessed part 7, and serves as a third support member that supports the left end of the pinion shaft B1 of the long pinion B. Long pinion B can be pivotally supported between. Note that the cut and raised portion 9 is subjected to drilling and coining after the cut and raised portion 9 to form a support portion for the pinion shaft B1.

A clutch inner 10 is welded to the flange portion 6 of the second support member 2, and the outer periphery of the clutch inner 10 is engaged with a disk of a clutch such as a brake for stopping rotation of the carrier. Then, the input shaft C of the transmission was inserted into the carrier configured as described above, and the first sun gear D, which was supported on the input shaft C, was supported on the short pinion A and the gear shaft of the first sun gear D. The second sun gear E is meshed with the long pinion B in the second support member 2, and the ring gear F connected to the output shaft of the transmission is meshed with the long pinion B on the outer periphery of the carrier, thereby forming a planetary gear mechanism. Assemble.

[0009]

As is clear from the above description, according to the present invention, the short pinion is pivotally supported between the first support member and the second support member, and the short pinion is formed on the peripheral wall of the second support member. The long pinion can be pivotally supported between the cut-and-raised part and the first support member, and there is no need to separately provide a third support member for the long pinion, reducing the number of parts and reducing the cost and weight of the carrier. It has the effect of achieving

[Brief explanation of drawings]

[Figure 1] Longitudinal cross-sectional view of an example of the carrier of the present invention

[Figure 2]
Right side view of Figure 1

[Figure 3] Cross-sectional view taken along line III-III in Figure 1

[Figure 4]
A perspective view showing the manufacturing process of the second support member

[Figure 5]
Longitudinal cross-sectional view of a conventional carrier

[Explanation of symbols]

1 First support member 2 Second support member
5 Peripheral wall portion 9 Cut-and-raised portion A Short pinion B Long pinion

Claims (1)

[Claims] 1. A carrier used in a planetary gear mechanism including a short pinion and a long pinion meshing with the short pinion as a planetary gear, the carrier having one axial end supporting one end of each pinion shaft of the short pinion and long pinion. a first support member, a second support member at the center in the axial direction that supports the other end of the pinion shaft of the short pinion, and a third support member at the other end in the axial direction that supports the other end of the pinion shaft of the long pinion.
A peripheral wall extending toward the other end in the axial direction is integrally formed with the second supporting member, and a portion of the peripheral wall that matches the location where the long pinion is arranged is located at the other end in the axial direction. A carrier for a planetary gear mechanism, characterized in that the carrier is cut and raised radially inward, and the cut and raised portion constitutes the third support member.