JPS6322357Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a planetary gear system, and is designed to restrict relative movement between an internal gear which can be fixed via a clutch and the clutch.

In recent years, planetary gear units are often employed as transmissions and automatic transmissions. In this planetary gear device, when one of the internal gears, planetary gear support frames, and sun gears that make up the device is fixed and the other one is driven, the shifted power is extracted from the remaining one. be able to.

For this purpose, as shown in FIG. 1, for example, spline external teeth 1a are provided on the outer periphery of the internal gear 1, and spline internal teeth 2a which are rotated by meshing with the spline external teeth 1a and can freely slide are provided inside the internal gear 1. A multi-plate clutch 2 is provided which includes a number of clutch plates 2b disposed around the periphery, and the rotation of the internal gear 1 is prevented by this multi-plate clutch 2. This multi-plate clutch 2 is provided with a friction plate 4 which is slidable on a housing 3 via splines formed on the outer periphery between the clutch plates 2b, and a piston disposed opposite to the housing 3. 5, the clutch plate 2b and the friction plate 4 are pressed against the housing 3, and the rotation of the internal gear 1 is stopped by the friction force.
It is used to transmit the power of the planetary gear. In order to restrict the axial movement of the internal gear 1, that is, the relative movement between the clutch plate 2b and the internal gear 1, in order to ensure the engagement and release of the multi-plate clutch 2, the outer periphery of the internal gear 1 is controlled. A circumferential groove is carved from the outer circumferential side of the spline hub 1b in which the spline external teeth 1a are formed, and a retaining ring 6 as a locking member is installed in this groove. The side surfaces of the plate 2b abut.

However, since the retaining ring 6 is attached from the outside of the outer periphery of the internal gear 1, there is a risk that centrifugal force will be generated in the retaining ring 6 as the internal gear 1 rotates, causing it to fall off from the circumferential groove. be.

The present invention has been made in view of the prior art and aims to provide a planetary gear device equipped with a locking member that does not fall off even due to centrifugal force caused by rotation of an internal gear. The configuration of the present invention to achieve such an object includes a cylindrical spline hub in which an internal gear is formed on the inner circumferential surface and spline external teeth are formed on the outer circumferential surface, and the spline external teeth of the spline hub are In the planetary gear device, the spline internal teeth are formed on the inner circumferential surface of the spline hub to be spline-fitted, and the clutch plate is capable of preventing rotation of the spline hub. A locking groove portion communicating with the surface of the spline external tooth is provided, and the locking groove portion protrudes from the surface of the spline external tooth toward the outer circumferential side and is prevented from coming off in the outer circumferential direction with respect to the spline hub. The present invention is characterized in that a locking member is attached to the side end surface of the clutch plate to restrict relative movement between the clutch plate and the spline hub by a certain amount or more.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 2 is an enlarged cross-sectional view of only the outer peripheral portion of the internal gear, which is the main part, of an embodiment of the planetary gear device of the present invention. In the figure, parts that are the same as those in the prior art are designated by the same numbers.

A spline hub 1b having spline external teeth 1a is provided on the outer periphery of the internal gear 1 of the planetary gear device, and a clutch plate 2 has spline internal teeth 2a formed on the inner periphery to mesh with the spline external teeth 1a.
A large number of b are fitted and are slidable. and,
A friction plate 4, which together with the clutch plate 2b constitutes the multi-plate clutch 2, is provided between the clutch plates 2b, and its outer periphery is connected to the housing 3 through a spline or the like.
A piston 5 is provided to face the housing 3 and sandwich the clutch plate 2b and the friction plate 4.
The internal gear 1 is fixed by sliding and pressing b and the friction plate 4. The sliding of the clutch plate 2b at this time applies a force in the axial direction to the internal gear 1, but in order to restrict this movement, a spline external tooth is attached to the inner circumferential side of the spline hub 1b of the internal gear 1. An annular mounting groove (locking groove hole portion) for a retaining ring 6 as a retaining member having a depth capable of communicating with the surface of 1a is formed, and the ring-shaped retaining ring 6 is installed in this mounting groove. . As a result, the spline external tooth 1a
The retaining ring 6 protrudes from the troughs, and is buried at the peaks, so that the outer peripheral end surface of the retaining ring 6 is held down.
It is prevented from coming off in the outer circumferential direction due to centrifugal force.

In this way, the retaining ring 6 is attached from the inner peripheral side of the spline hub 1b, and the side surfaces of the spline internal teeth 2a of the clutch plate 2b come into contact with the side surfaces of the retaining ring 6, so that the internal gear 1 moves in the axial direction and the clutch plate 2b moves. In addition, when the internal gear 1 rotates, centrifugal force acts on the retaining ring 6, but this centrifugal force can be received by the outer peripheral end surface of the retaining ring 6, so that the retaining ring 6 does not fall off.

FIG. 3 is an enlarged view of the internal gear portion of another embodiment of the present invention, in which the locking member is changed from a retaining ring to a pin.

The mounting hole (locking slot) for the pin 7 is bored from the inner peripheral side of the spline hub 1b of the internal gear 1 toward the trough of the spline 1a, and its depth is determined by the tooth of the spline external tooth 1a. It is adjusted to have a certain depth toward the tooth tip side from the bottom, and when the pin 7 is clamped from the inner peripheral side of the spline hub 1b, the tip part hits the peak of the spline external tooth 1a and falls out. A large diameter portion is formed at the base end of the pin 7 to further ensure that the pin 7 does not fall out.

At least one pin 7 may be provided on the same circumference, but if a large number of pins 7 are provided at equal intervals on the circumference, the movement of the internal gear 1 can be more reliably regulated.

As described above in detail with the embodiments, according to the present invention, the axial movement of the internal gear can be restricted by a simple configuration in which the locking member is attached from the inner peripheral side of the internal gear. The locking member will not fall off even if

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the main parts of a conventional planetary gear device, FIG. 2 is a sectional view of the main parts of an embodiment of the planetary gear device of the present invention, and FIG. It is a sectional view of such a main part. In the drawings, 1... internal gear, 1a... spline external teeth, 1b... spline hub, 2... multi-plate clutch, 2a... spline internal teeth, 2b... clutch plate, 3... housing, 4... ...Friction plate, 5...
Piston, 6... retaining ring, 7... pin.

Claims (1)

[Scope of utility model registration request] A cylindrical spline hub in which an internal gear is formed on the inner circumferential surface and spline external teeth are formed on the outer circumferential surface, and the spline internal teeth that are spline-fitted to the spline external teeth of this spline hub are formed on the inner circumferential surface. In a planetary gear device comprising a clutch plate formed on a surface and capable of blocking rotation of the spline hub, a locking groove communicating with the surface of the spline external teeth from the inner circumferential surface of the spline hub toward the outer circumferential surface. A hole is provided in the locking slot, and the locking groove protrudes from the surface of the external spline tooth toward the outer circumference, prevents the clutch from coming off in the outer circumferential direction from the spline hub, and abuts against the side end surface of the clutch plate. 1. A planetary gear device characterized in that a locking member is installed to restrict relative movement between the clutch plate and the spline hub by a certain amount or more.