JPH0130619Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a starting motor, and more particularly to an improvement of a moving device of a starting motor equipped with a pinion moving device.

[Prior art]

Conventionally, this type of starter motor has been constructed as shown in FIG. That is, the conventional starting motor 1 includes an armature 2, and the armature 2 includes an armature core 4 fitted onto a rotating shaft 3, and a core 4.
The armature coil 5 includes a slot-wound armature coil 5 (not shown). A front end bearing portion 6 at the tip of the rotating shaft 3 extending from the armature 2 is rotatably supported by a sleeve bearing 9 fitted in a through hole 8 formed at the front end of the front machine frame 7. ing.

A pinion moving cylinder 10 is fitted onto the rotating shaft 3 so as to be slidable on the shaft. This pinion moving cylinder 10 is composed of a pinion 11 and an overrunning clutch 12. This overrunning clutch 12 includes a cylindrical clutch outer 13 fitted so as to be able to slide on the rotating shaft 3.
Internal teeth are formed to mesh with the helical spline 14 formed in the helical spline 14 . The front end (the right end in FIG. 1) of the cylindrical clutch outer 13 is formed into an enlarged diameter section with a U-shaped cross section, and this enlarged diameter section functions as the one-way rotation transmission clutch section 15.

That is, the structure of the clutch portion 15 is such that the clutch inner 16 is disposed within the enlarged diameter portion of the clutch outer 13 and on the circumferential side of the rotating shaft 3;
The rotational force of the clutch outer 13 is transferred to the clutch inner 1.
A friction roller 17 is provided in a wedge-shaped space formed between the axially extending portion of the enlarged diameter portion and the clutch inner 16 in order to transmit rotation in one direction to the clutch inner 16 so as to bite into the narrowing direction of the space. ing. Note that 18 indicates a washer that engages the clutch outer 13, the clutch inner 16, and the friction roller 17, and 19 indicates a cover that crimps and secures the washer 18 to the clutch outer 13.

A retaining ring groove is formed on the peripheral surface of the overrunning clutch 12 near the rear end of the cylindrical clutch outer 13, and a washer 20 is loosely fitted into the retaining ring groove. An annular groove 21 is formed between the washer 20 and the enlarged diameter portion, and a cam portion 22a of a bifurcated portion formed at the lower end of the shift lever 22 is inserted into the groove 21 so that the clutch outer The cam portion 2 is arranged so as to straddle the cylindrical portion of the
2a and the side surface of the washer 20 or the side surface of the enlarged diameter portion are allowed to come into contact with each other.

On the other hand, the clutch inner 16 of the overrunning clutch 12 extends integrally from within the clutch outer 13 in the axial direction of the rotating shaft 3, and its extended portion constitutes an output rotating shaft 23, to which the pinion 11 is fixed. There is. In addition, the output rotation shaft 2
3 and the rotating shaft 3 is a sleeve bearing 24.
is located.

By the way, the shift lever 22 forms a pinion moving device together with the overrunning clutch 12, and the shift lever 22 has a pivot point 2 at its center.
2b. This fulcrum part 22b is formed by a protruding part 7a formed on the inner wall surface of the front machine frame 7, and a pressing part A formed by a plate 25 and a grommet 26.
It is rotatably clamped between the An end of the shift lever 22 opposite to the cam part 22a about the fulcrum part 22b is cam-engaged with a plunger 28 of an electromagnetic switch 27 screwed onto the front machine frame 7.

Note that 29 is a stopper that regulates the sliding of the pinion 11, 30 is a ring that transmits the pressure received by the stopper 29 to the rotating shaft 3, and 31 is the stepped portion 32 of the rotating shaft 3 and the inner peripheral surface of the front machine frame 7. Each shows a washi that is clamped between the two.

Next, the operation of the starter motor constructed as described above will be explained.

When the electromagnetic switch 27 is energized by an external power supply device (for example, an on-board battery), the plunger 28 is attracted into the housing and moves to the left as seen in FIG. 1, thereby rotating the shift lever 22. The cam portion 22a is rotated counterclockwise around the fulcrum portion 22b, the cam portion 22a is moved forward (to the right in FIG. 1), and the overrunning clutch 12 is slid forward on the rotation shaft 3. As a result, the pinion 11 is meshed with a ring gear (not shown) of the internal combustion engine.

Thereafter, the main contact (not shown) of the electromagnetic switch 27 is closed, and the armature 2 is connected to the aforementioned external power supply to generate rotational force, which causes the helical spline 14 of the rotating shaft 3 to is transmitted to the overrunning clutch 12 via the pinion 11
is urged to rotate. As a result, the aforementioned internal combustion engine is started.

After the engine is started, the pinion 11 is forced to over-rotate at a high rotational speed by the internal combustion engine, but the friction roller 17 is disengaged and the one-way rotational force transmission function is activated, causing only the pinion 11 to rotate. is urged to over-rotate, and the rotating body before clutch outer 13 is rotated by armature 2.
It rotates freely with no load.

In such a conventional starter motor, the cam portion 22a of the shift lever 22 comes into sliding contact with the washer 20 of the annular groove 21 of the overrunning clutch 12 at high speed, resulting in abnormal wear of the cam portion 22a. . That is, the washer 20 is attached to the clutch outer 1
Although the clutch outer 13 is loosely fitted in the retaining ring groove formed in the cylindrical part 3, when the clutch outer 13 rotates at high speed, it rotates accordingly, and as a result, the cam part 22
This caused abnormal friction with a.

[Summary of the idea]

The present invention was developed in order to eliminate the drawbacks of the conventional ones as described above, and its purpose is to provide a starter motor that prevents the washer from rotating and prevents abnormal wear with the shift lever. do.

[Example of idea]

Hereinafter, the starter motor of the present invention will be described in more detail with reference to preferred embodiments shown in the accompanying drawings.

2 to 4 partially show a pinion moving cylinder 110 of a starter motor according to an embodiment of the present invention. In FIGS. 2 to 4 showing this pinion moving cylinder 110, the same parts as those of the conventional starter motor shown in FIG. 1 are given the same reference numerals, and the explanation thereof will be omitted.

In a starting motor according to an embodiment of the present invention,
The overrunning clutch 112 constituting the pinion moving cylinder 110 includes a further washer or washer 111 that is loosely fitted in the cylindrical portion of the clutch outer 13 adjacent to the washer 20 and on the annular groove 21 side. This washer 111 has a bent portion 1 perpendicular to the end.
13 is formed. That is, circular washer 1
11 is bent at a right angle to form an L-shape as a whole. Other than these configurations, the first
It has the same configuration as the conventional starter motor shown in the figure.

The operation of the starter motor having such a pinion moving cylinder 110 will be explained. shift lever 2
2 is rotated and biased in the counterclockwise direction in the same manner as explained in the conventional device of FIG. 1, the overrunning clutch 112 is moved forward (rightward in FIG. (not shown), and the ring gear is urged to rotate in the same manner as described for the conventional device of FIG. After the engine is started, when the shift lever 22 is returned in the same manner as described in the conventional device shown in FIG.
This pressing force is applied to the clutch outer 1 through the washer 13 and retaining ring groove.
12 and the overrunning clutch 11
0 is reset in the same manner as explained in the conventional device of FIG. 1, and after several seconds of inertia rotation, the rotation stops and comes to a standstill. At this time, the bent portion 113 of the washer 111 comes into contact with the end of the cam portion 22a of the shift lever 22, and the rotation is prevented from rotating. That is, washer 1
The rotation of the washer 111 due to the rotational frictional force of No. 3 being transmitted to the washer 111 is stopped by the shift lever 22.

In this way, the pressing force of the shift lever 22 is not directly transmitted to the washer 13, and the washer 111 does not rotate, so that wear of the cam portion 22a can be prevented. In addition, in the above-mentioned embodiment, the washer 13 and the shift lever 2
2, the washer 111 is loosely fitted between the cam portion 22a of the clutch outer 112 and the shift lever 22 in the opposite direction, that is, the shoulder portion of the clutch outer 112 (section B in FIG. 2) and the shift lever 22. Cam part 2
2a, and in this case, wear of the cam portion can be prevented even when the shift lever 22 is protruded forward.

[Effect of idea]

As mentioned above, according to the present invention, a washer with a part bent at a right angle is provided between the cam part of the shift lever and the axial wall surface of the annular groove with a U-shaped cross section provided in the pinion moving cylinder. Since the gears are loosely fitted so as to be locked with rotation, abnormal wear of the device, especially the shift lever, is prevented.

[Brief explanation of the drawing]

FIG. 1 is a sectional view partially showing a conventional starter motor, FIG. 2 is a front view partially showing a pinion moving cylinder of a starter motor according to an embodiment of the present invention, and FIG.
This figure is a side view of the pinion moving barrel shown in FIG. 2, and FIG. 4 is a bottom view of the pinion moving barrel shown in FIG. 2. 2... Armature, 3... Rotating shaft, 7... Front machine frame, 11... Pinion, 13... Washer, 14...
Spline, 21... Annular groove, 22... Shift lever, 22a... Cam portion, 110... Pinion moving tube, 111... Washer, 112... Clutch outer, 113... Bent portion. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims for Utility Model Registration] (1) An armature, a pinion moving cylinder slidably mounted on the rotating shaft so as to be connectable to a spline formed on the rotating shaft of the armature, and the pinion moving cylinder attached to the rotating shaft of the armature. a shift lever that is cam-engaged with the groove; and a washer that is loosely fitted in the groove, and a bent portion that is perpendicular to the end of the washer; A starter motor, characterized in that the washer is prevented from rotating by forming an engaging end portion of the shift lever. (2) Utility Model Registration In the starter motor according to claim 1, the pinion moving cylinder is composed of a pinion and an overrunning clutch that transmits rotational force from a rotating shaft to the pinion,
A starter motor characterized in that the annular groove is disposed on a clutch outer of the overrunning clutch.