JPH0415985Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to an engine starting device incorporating a planetary gear, and particularly to an improvement in the pressure receiving structure for the impact force generated on the rotating shaft.

[Conventional technology]

3 and 4 are cross-sectional views showing a conventional planetary gear reduction device disclosed in, for example, Japanese Utility Model Application Publication No. 58-70546. In the figures, 1 is supported by a support pin 3 via a sleeve bearing 2. planetary gears,
4 is a sun gear that meshes with this. Reference numeral 8 denotes a locking pin assembly in which a pin portion 9 and a flange portion 10 are integrated with a vibration-proof rubber member; 11 denotes a machine frame into which an internal gear 12 is fitted; The pin portion 9 of the locking pin assembly 8 is embedded in a cylindrical cavity formed by the provided groove 13 and the groove 14 provided in the internal gear 12. Reference numeral 15 denotes a flange to which the support pin 3 is fixed, and an output rotating shaft 16 is fixed integrally therewith. Reference numeral 17 denotes an input rotating shaft fixed to the spur gear 4, and supported by a ball bearing 18 fitted to the machine frame 11. Reference numeral 19 denotes a second machine frame that is fitted into the spigot part 20 of the machine frame 11 and holds the internal gear 12 and the flange part 10 of the locking pin assembly 8 therebetween.

Next, the operation will be explained. A rotational force acts on the sun gear 4, and the planetary gear 1 meshed with the sun gear revolves around the inner peripheral surface of the internal gear 12, and further rotates around the support pin 3, causing the rotation of the sun gear 4. The force is transmitted to the support pin 3 and generates the function of the planetary gear reduction device. At this time, the rotational reaction force generated in the internal gear 12 is elastically applied to the machine frame 11 via the pin 9.
pressure is received.

[Problem that the invention attempts to solve]

Since the operating shock load receiving mechanism of the conventional planetary gear reduction gear is constructed as described above, the pin 9 made of a vibration-proof rubber member receives a shear load, and cracks may develop on the surface after repeated use. There were problems such as a reduction in the original impact absorption effect.

This idea was made in order to solve the above problems, and it is designed to provide an operating shock load pressure receiving device for a planetary gear reduction gear that can receive the above shearing load and prevent cracks from occurring in the vibration isolating rubber member. The purpose is to obtain.

[Means for solving problems]

The planetary gear reduction device according to this invention has plate-like members made of a rigid body attached to both ends in the circumferential direction of an elastic body block fitted in a space between a machine frame and an internal gear.

[Effect]

In this invention, no shearing force acts on the elastic body, and the shearing load is received by the rigid plate-like members at both ends.

〔Example〕

An embodiment of this invention will be described below with reference to the drawings. In FIG. 1, 21 is a planetary gear reduction device 2.
2 is a built-in engine starting device, 23 is a machine frame (front bracket), and internal gear device 2 is installed on the inner peripheral surface.
4 is rotatably supported. 25 is an internal gear on which an involute gear is formed; 26 is a groove disposed on the outer circumferential surface of the internal gear device 24; and 26 is a groove disposed on the outer circumferential surface of the machine frame 23; A closed space is formed between them, and two mild steel plates are placed at both ends within this space.
A vibration isolating rubber block 28 with a rubber ring 9 interposed therein is fitted. Note that 30 is a DC motor (not shown) attached to the machine frame 23.
It is a through bolt that is screwed into. Note that a planetary gear reduction device similar to the conventional device shown in FIGS. 3 and 4 is installed in the inner peripheral space of the internal gear device 24. Furthermore, since the operation of the device is the same as the conventional one, a description thereof will be omitted.

According to the above configuration, the meshing reaction force of the planetary gear internally meshed with the internal gear 25 is generated by the mild steel plate 2 which is a rigid body.
Since the pressure is transmitted to the vibration isolating rubber block 28 via the shock absorber 9 and received by the machine frame 23, the shear load does not act on the vibration isolating rubber block 28, and the impact force has a high pressure receiving capacity and acts on the vibration isolating rubber block 28. The occurrence of cracks due to shear loads is prevented, ensuring long-term operational reliability of the device.

In the above example, a case has been described in which mild steel plates that receive shear loads are interposed at both ends of the vibration isolating rubber block, but they may also be embedded in the ends of the vibration isolating rubber block 28 as shown in FIG.

[Effect of idea]

As described above, according to this invention, a rigid plate member is interposed at the end of the elastic body fitted between the machine frame and the internal gear, so the durability of the device is improved. This has the effect of providing a high anti-vibration (shock absorption) function with a simple configuration.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of an engine starting device according to an embodiment of this invention, FIG. 2 is a sectional view of main components according to another embodiment of this invention, FIG. 3 is a sectional view of a conventional device, and FIG. The figure is a sectional view taken along the - line in FIG. 3. In the figure, 21 is an engine starting device, 22 is a planetary gear reduction device, 23 is a machine frame, 24 is an internal gear device, 25
2 is an internal gear, 26 and 27 are grooves, 28 is a vibration-proof rubber block, and 29 is a mild steel plate. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In an engine starting device equipped with a planetary gear reduction device installed in a machine frame and interposed between a driving shaft and an output rotating shaft, the planetary gear reduction device described above The outer periphery of the internal gear is rotatably fitted to the inner periphery of the machine frame, and a groove provided on the outer periphery of the internal gear and a groove provided on the inner periphery of the machine casing. An engine starting device comprising an elastic block fitted with rigid plate-like members that receive shear loads at both ends in the circumferential direction, in a closed space formed between the two. (2) The engine starting device according to claim 1, wherein the rigid plate member is embedded in the end of the rubber block.