JPS6139110Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a mechanism for absorbing impact stress when the starter pinion protrudes.

Conventionally, there was a device of this type as shown in FIG. In the diagram, 1 is the starter (engine starting device)
The front bracket 2 is a sleeve bearing fitted onto the inner circumferential surface of the front end of the front bracket, and supports the front end of a pinion shaft (output rotating shaft) 3. 4 is a helical spline formed on the pinion shaft 3, and the clutch outer 6 of the overrunning clutch 5 is engaged with the helical spline. Reference numeral 7 denotes a clutch inner which is urged to rotate in one direction by the rotational force of the clutch outer 6 by a roller 8, and a pinion 9 is fixed to the end thereof. A sleeve bearing 10 is fitted onto the inner peripheral surface of the pinion, and is slidably fitted onto the pinion shaft 3 so as to swing. Reference numeral 11 denotes a protrusion that prevents the overrunning clutch 5 from protruding forward (to the right in the figure), and is formed at the front end of the helical spline 4 and comes into contact with the clutch outer 6. 12 is a washer that engages the roller 8 and the clutch inner 7, and 13 is a cover that fixes this washer and is fixed to the clutch outer 6 by caulking.

Next, the operation in the above configuration will be explained. The overrunning clutch 5 is moved forward by a shift lever (not shown), slides on the pinion shaft 3, and the pinion 9 is engaged with a ring gear of an engine (not shown). Next, the pinion shaft 3 is urged to rotate by a DC motor (not shown), and this rotational force is transmitted to the ring gear of the engine via the helical spline 4, the clutch outer 6, the roller 8, the clutch inner 7, and the pinion 9 to start the engine. (cranking).

The conventional device is constructed as described above, and when the overrunning clutch 5 protrudes forward, the clutch inner 6 collides with the protrusion 11, generating a large impact force on the device. Therefore, there was a drawback that the above-mentioned impact force was aggravated when the ring gear of the engine was engaged.
In addition, starters that support the front end of the pinion shaft with a front bracket (front nose type) have drawbacks such as the fact that it is quite difficult to install a shock absorber to sufficiently absorb the impact force due to space constraints. It was hot.

This invention was made in view of the above-mentioned drawbacks, and the above-mentioned drawbacks were eliminated by providing a buffer mechanism at the front end of the pinion shaft to receive the protruding impact force of the pinion (overrunning clutch). be.

An embodiment of this invention will be described below with reference to the drawings. In FIG. 2, 14 is a pinion shaft;
A collar 15 is slidably fitted onto its front end, and this collar is further supported by a sleeve bearing 2. A bolt 16 is screwed onto the front end of the pinion shaft 14, and a disc spring 17, which is an elastic body, is fitted between the bolt head and the collar 15. The rest of the configuration is the same as the conventional machine frame shown in Figure 1.
The same reference numerals are used to omit the explanation.

Next, the operation of the above configuration will be explained using FIG. 3. The overrunning clutch 5 is moved forward and energized in the same way as in the conventional device shown in FIG. 1, and the pinion 9 is fitted into the ring gear of the engine (not shown). In this state, the pinion shaft 14 is urged to rotate by a DC motor (not shown), and the helical force of the helical spline 4 acts to press the disc spring 17 into the state shown in FIG. 3. This pressing force is achieved by the contact force of the pinion 9 being transmitted to the disc spring 17 via the collar 15, and constitutes a necessary impact force mitigation mechanism.
Incidentally, the above-mentioned urging force is received by the pinion shaft 14 via the bolt 16.

In the above description, the disc spring 17 is secured by the bolt 16, but the pinion shaft 14 may be configured to protrude from the front bracket 1 and receive pressure with a stopper (retaining ring).

As described above, according to this invention, the collar 15 passes through the front bracket that supports the pinion shaft.
The structure is such that an elastic body that receives the impact force when the pinion protrudes through this collar is attached to the outside of the front bracket, making it extremely easy to attach and detach the elastic body and to precisely set the stress. This has the excellent effect that a device capable of receiving high impact stress can be obtained without destroying the basic structure of the conventional device.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part showing a conventional device, FIG. 2 is a sectional view of a main part of a buffer absorbing device according to an embodiment of the present invention, and FIG. 3 is an explanatory diagram of the operation. In the figure, 5 is an overrunning clutch, 9 is a pinion, 14 is a pinion shaft, 15 is a collar, 16
is a bolt, and 17 is a disc spring. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims for Utility Model Registration] (1) In a front nose type starter in which the front end of the pinion shaft is supported by the front machine frame, the front nose type starter is slidably fitted to the front end of the pinion shaft through the front machine frame, and A shock absorbing mechanism for a starter, characterized in that a collar is provided that is supported by a machine frame and receives the protruding stress of the pinion, and an elastic body is provided between the collar and an engaging portion formed at the tip of the pinion shaft. . (2) The shock absorbing mechanism for a starter according to claim 1, wherein the elastic body is a disc spring. (3) Utility model registration claim 2, in which a bolt is screwed onto the tip of the pinion shaft to serve as an engagement part for a disc spring.
Shock absorption mechanism of the starter as described in .