JPS62218658A - Planetary reduction gear build-in type starter - Google Patents

Abstract

PURPOSE:To enable sufficient buffering effect to be developed even if a large impact force is applied, by interlocking an engaging member that can convert the torque caused by the rotational fluctuation applied on an internal gear into a force in the axial direction. CONSTITUTION:The torque produced on the rotating shaft 11 of a d.c. motor 1 is transmitted to a planetary gear 8 via a spur gear 12, and by the planetary gear motion thereof it is transmitted to an output turning shaft 15. When a torque caused by the rotational fluctuation is produced on an internal gear 18 which transmits the reaction force of the output turning shaft 15 caused by the planetary gear motion to a machine frame 21, an impact force is applied on a pressure receiving part 19 arranged on the internal gear 18. Thereupon, while the impact force is applied on an engaging member 20 interlocked with the pressure receiving part 19, since the axial direction projected parts 20b are fitted in the cutout parts 21a on the machine frame 21, the movement of engaging member 20 in the diametrical direction is restricted, and the contacting part 20a moves in the axial direction keeping contact with the slopes of projections or recesses of the pressure receiving part 19. Thus, the engaging member 20 converts the impact force into a force in the axial direction.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a starter with a built-in planetary gear reduction device, and particularly to an improvement in its buffer mechanism.

[Conventional technology]

FIG. 3 is a sectional view showing a conventional starter disclosed in, for example, Japanese Utility Model Application Publication No. 58-5385'7 (m-m# in FIG. 4).
FIG. 4 is a sectional view taken along the IF-W line of the third prisoner.

First, in Fig. 3, (1) is a DC motor with rotor α
Q, a ball (7) made of a permanent magnet member that magnetizes this rotor (to), and a yoke f3 to which this is attached to the inner peripheral surface.
It mainly consists of 1 and 1. (6) is the rotating shaft of the rotor QO, a spur gear (6) is formed at its protruding end, and an output rotating shaft (to) is connected to a sleeve bearing (7) at the front end of this rotating shaft (b). Supported through. (4) is the internal gear wheel, and the elastic body (6) as described later in Figure 8g3.
and 0 (8), which is fixed to the machine frame (2) through the housing (5), is a planetary gear that is engaged with the spur gear (6) and the internal gear (4); It is supported via a bearing (9) by a pin 03 fitted to a flange portion α4 formed at the end of the output shaft (to), and performs planetary gear movement.

(B) is a pole bearing fitted to the machine frame (2) K, which rotatably supports the output shaft (G).

Next, in FIG. 4, a fan-shaped convex part (4a) and a concave part (4b) are arranged on the outer peripheral surface of the internal gear wheel (4),
The inner peripheral surface of the housing (5) has the fan-shaped convex portion ←a.
) has a fan-shaped recess (5a) disposed so as to engage against circumferential rotational force, and a fan-shaped convex part (5b) disposed opposite the recess (410 km), and the convex g (4a) ) and the concave part (5a), and the concave part (4b) and the convex part (5b) are loosely fitted into each other so that they can rotate by a small angle around the planetary gear rotation axis.The convex part (4a) and the concave part (5a) The gap is filled with an elastic body (6) such as rubber under pressure. (5c) fixes the housing (5) to the protrusion (2a) K of the machine frame (2). This is a groove provided for this purpose.

Next, the operation will be explained. The rotor αQ is energized and energized by a battery (not shown), and comes under the magnetic force of the balls (7) to generate rotational force on the rotating shaft (6).

This rotational force is transmitted to the planetary gear (8)K via the spur gear (2) of the rotating shaft (6), and the planetary gear movement causes the pin (to) to rotate in the direction of rotation of the spur gear (8), and the flange The rotational force in the same direction is transmitted to the output rotating shaft (g) through the part (b). The rotational force of the output rotating shaft (g) drives a ring gear (not shown) of the internal combustion engine via a pinion (not shown) attached to the front end of the rotating shaft μs. Note that due to the planetary gear movement of the gear (8), a reaction force (to the output rotational force) is generated on the internal teeth (4), and this reaction force is applied to the housing (5).
It will be transmitted to the machine frame (2) via.

[Problem that the invention seeks to solve]

The conventional STARS with a built-in planetary gear reduction device is configured as described above, so that the impact force generated due to rotational fluctuations applied to the internal gear (4) is transferred to the housing (5) and the machine frame (2).
Since the impact is received only in the direction of rotation, there are problems such as the inability to handle large impacts.

This invention is a ninth attempt to solve the above-mentioned problems, and an object of the present invention is to obtain an internal starter for a planetary gear reduction device that can realize a sufficient buffering effect even when a large impact force is applied.

[Means for solving problems]

The starter with a built-in planetary gear reduction device according to the present invention receives the force of the pressure receiving part between the pressure receiving part disposed on the internal gear and the machine frame, and is caused by rotational fluctuations applied to the internal gear. An engaging member that can convert rotational force into axial force is engaged.

[For production]

The retaining member in this invention converts the rotational force accompanying the 1 gJ rotational fluctuation applied to the internal gear into an axial force.

〔Example〕

Figures 1 and 2 are a sectional view and a perspective view of the main components of a starter with a built-in planetary gear reduction device, showing an embodiment of the present invention. An axial notch 01a) is formed.

(to) is an internal gear with a flange whose tip is supported on the output rotating shaft by a bearing αη, and is a planetary gear (8)
A ring-shaped pressure-receiving part Q is provided with a tooth part Q8a) that meshes with the inner periphery, and has an axial unevenness with a trapezoidal cross section on the outer periphery.
The groans are arranged in one piece. The wing is a retaining member that is engaged with the pressure receiving part CA part and the machine frame @υ, and is connected to the pressure receiving part (19a).
) of the contact part formed in an uneven shape so that it can be fitted with the Oa)
The contact portion (20a) moves along the slope of the pressure receiving portion Q. ■ob) is an axial protrusion that fits into the notch ■la) of the machine frame @υ and is positioned at the machine frame (2υ).This retaining member (1) is different from the above-mentioned yoke (3). The machine frame (21) K is attached through a predetermined axial clearance.

Next, the operation when an impact force is generated will be explained. When an impact force (rotational force due to rotation fluctuation) is generated on the internal gear wheel, the internal gear wheel (
The impact force is applied to the pressure receiving part cm Vc# located at Then, an impact force is applied to the retaining member (1) engaged with the pressure receiving part αIK, but the retaining member (1) has an axial protrusion (Boa) that fits into the machine frame (notch 01→2). , the radial movement is restricted, and the engaging member handle is connected to the contact part (j?oa).
moves in the axial direction while contacting the uneven slope of the pressure receiving part (6). The engagement member (1) thus converts the impact force into an axial force.

In the above embodiment, the unevenness of the pressure receiving part has an isosceles trapezoidal cross section. However, if the impact force in one direction is to be dealt with, the unevenness has a right-angled trapezoidal cross section, and the engaging member is designed to engage with the unevenness. It is sufficient to have a configuration of O. It goes without saying that it is also possible to provide a concavo-convex tip VcR.

It goes without saying that the pressure receiving part may be separate from the internal gear.

〔Effect of the invention〕

As described above, according to the present invention, the engaging member receives the force of the pressure receiving part disposed on the circular wheel and converts the rotational force accompanying the rotational fluctuation applied to the internal teeth iK into an axial force. Since it is provided so as to be engaged between the pressure receiving part and the machine frame, a sufficient buffering effect can be obtained even if a large impact force is generated on the internal gear.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a starter with a built-in planetary gear reduction device, showing one embodiment of the present invention. Fig. g2 is a perspective view of its main constituent members, Fig. 3 is a sectional view showing a conventional device, and Fig. 4 is a joint sectional view thereof. In the figure, (g) is the internal gear wheel, field (a) is the pressure receiving part, fence is the retaining member, and (21) is the machine frame. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] In a device having a planetary gear reduction gear mounted within a machine frame, the pressure receiving part is disposed on an internal gear of the planetary gear reduction gear, and the pressure receiving part is engaged between the pressure receiving part and the machine frame, A starter with a built-in planetary gear reduction device, comprising an engaging member capable of converting rotational force accompanying rotational fluctuations applied to the internal gear in response to the force of the pressure receiving portion into axial force.