JPS63181636A - Starter motor - Google Patents

Abstract

PURPOSE:To prevent the abrasion of a stopper, by a constitution wherein the stopper is abutted against a C-washer, secured to the nose of a forward machine frame, under a condition that the starter is stopped while the stopper is released from the C-washer upon only starting the starter, in which a pinion shaft is rotated. CONSTITUTION:When a starter is stopped after starting an engine, the protrusion 5b of a stopper is abutted against a C-washer 9 by a spring 8, therefore, the left end of a sleeve bearing 2, which is shown by a diagram, becomes a dust- proof structure. A pinion 10 is advanced only upon starting a starter and the stopper 5 is pushed out rightwardly in the diagram whereby the stopper 5 is released from the C-washer 9 and becomes an open structure, however, it is a very short period of time such as several seconds or the like. According to this constitution, the abrasion of the C-washer 9 due to the rotation of the stopper may be prevented effectively.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a dustproof device for a starter motor, and more particularly to a dustproof device for a starter motor in which the front end of a pinion shaft is supported by a sleeve bearing.

[Conventional technology]

Conventionally, this type of dustproof device was put into public use in 1986-355.
As described in No. 0, a rubber ring was fixed to the end face of the stopper, and the sleeve bearing had a dust-proof structure. However, although the function in the initial state achieves its purpose, as the pinion shaft rotates, the rubber ring fixed to the end face of the stopper comes into contact with the nose of the front machine frame, causing the rubber ring to wear out. Gender was not considered.

[Problem that the invention seeks to solve]

The above conventional technology does not take into consideration the fact that the rubber ring fixed to the end face of the stopper is constantly in contact with the nose of the front machine frame, and as the pinion shaft rotates, the rubber ring There was a problem that the rubber ring would wear out due to contact with the nose of the frame.

The object of the present invention is that most of the time dust enters the sleeve bearing fixed to the front machine frame when the engine is rotating. The stopper comes into contact with a C washer fixed to the nose of the front machine frame, and the stopper separates from the C washer only when the starter starts, when the pinion shaft rotates, thereby preventing the stopper from wearing out. The object of the present invention is to provide a dustproof device with excellent dustproofing effects.

[Means for solving problems]

The above purpose is to form a through hole in the nose of the front machine frame into a concave shape, provide a projection on the outer surface of the stopper, and form a sealing mechanism by being brought into contact with the inner surface of the concave shape. Furthermore, this can be achieved by enlarging the clip groove on the inner surface of the stopper.

[Effect]

When the starter is stopped, the C washer fixed to the nose of the front machine frame and the stopper outer protrusion are in contact with each other by a spring provided between them. As a result, the front machine frame nose part and the stopper outer surface protrusion form a sealing mechanism.
Has a dustproof structure. Only when the starter starts, the stopper is pushed out and separated from the C washer. As a result, even if the pinion shaft rotates, the C washer fixed to the stopper protrusion and the nose of the front machine frame will not wear out.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

The figure explains in detail the structure of the front machine frame nose section of the starter motor.The front machine frame nose section 1. A sleeve bearing 29 is fixed to a through hole at the front end of the nose portion 1; a lid 3 is fixed to a stepped portion provided at the front end of the through hole to seal the front end of the sleeve bearing 2; A pinion shaft 4 that is loosely fitted and supported by the sleeve bearing 2. A pinion 10 is spline-engaged with an overrunning clutch 11 and a clutch inner 12 fixed to the output rotating shaft of the overrunning clutch so as to be slidable back and forth on the pinion shaft 4. Fit into pinion shaft 4.

Stopper cylinder 5 with a lip groove that can be further moved back and forth
．． A ring 7 located at the bottom of the trumpet-shaped opening 5a at the end thereof and mounted in a groove 6 cut into the pinion shaft 4;
C washer 9 fixed to the front machine frame 1 with screws, etc. It is composed of a protrusion 5b provided on the outer periphery of the stopper 5, and a spring 8 provided between the protrusion 5b and the front machine frame 1.

Next, the operation of the starter motor equipped with the dustproof device configured as described above will be explained. In FIG. 2, the pinion 10 is moved forward (rightward in the figure) by a shift lever (not shown), the pinion 10 advances to a position where it contacts the stopper 5, and the pinion 10 is transferred to a ring gear (not shown) of an engine (not shown). Bit into it. Thereafter, the pinion shaft 4 is urged to rotate by a DC motor (not shown), and this rotational force is applied to the overrunning clutch 11. clutch inner 12
．． The signal is transmitted to the pinion 10 and the engine is started.

After the engine starts, the pinion 10 is reversely biased at high rotational speed by the ring gear (not shown), but only the pinion 10 rotates on the end face of the stopper 5 due to the overrunning clutch 11, and the pinion shaft 4 is unloaded. Freely rotated. Then, the pinion 10 retreats, returns to the state shown in FIG. 1, and stops.

According to this embodiment, when the starter stops after the engine starts (
That is, while the engine is rotating), as shown in FIG. 1, the stopper protrusion 5b is brought into contact with the C washer 9 by the spring 8, so that the left end of the sleeve bearing 2 in the drawing has the effect of becoming dust-proof. Also, only when the starter is started, as shown in FIG. 2, the pinion 10 moves forward and pushes the stopper 5 forward (rightward in the figure), so that the stopper 5 separates from the C washer 9 and becomes an open structure.
This period is only a few seconds. Rather, it has the effect of preventing wear of the C washer 9 due to rotation of the stopper 5.

[Effects of the Invention] According to the present invention, when the starter is stopped, the stopper and the C washer come into contact with each other, so that the bearing mechanism part on the inner peripheral side of the front machine frame is sealed, so that the metal (sleeve bearing) Wear life is increased, and when starting the starter,
Since the stopper and the C washer are separated, there is an effect that the wear life of the stopper and the C washer due to rotation of the stopper is increased.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the upper half of the shaft bearing showing an embodiment of the invention when the starter is stopped, and FIG. 2 is a sectional view of the upper half of the shaft bearing showing an embodiment of the invention when the starter is started. be. 1... Front machine frame nose section, 2... Sleeve bearing. 3...Lid, 5...Stopper, 5b...Stopper outer periphery protrusion ratio 1 day 7 Figure 10-1-Vinyl 4in

Claims (1)

[Claims] 1. A sleeve bearing fitted into a through hole formed in the nose of the front machine frame of the starter motor, a pinion shaft supported by the sleeve bearing, and a spline engagement that allows movement on the pinion shaft. In the nose portion of the front machine frame of the starter motor, which is composed of a pinion and a stopper that regulates the transfer position of the pinion, a C washer fixed to the nose portion and a protrusion on the outer circumferential surface of the stopper that abuts the C washer. 1. A starter motor comprising: a stopper having a groove that is an enlarged portion of the clip attachment portion on the inner peripheral surface of the stopper; and a spring provided between the nose portion and the stopper.