JPH0231580Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an improvement of the thrust load receiving device of the starter, especially the front nose type starter in which the pinion shaft is supported by a flat bearing device (sleeve bearing) mounted on the front machine frame. be.

Conventionally, there was a device of this type as shown in FIG. In FIG. 1, 1 is a starter, 2 is a pinion shaft that is integrally fixed to the armature rotating shaft of a DC motor (not shown), and 3 is a protrusion on the front machine frame manufactured by an aluminum alloy die-casting method. A sleeve bearing (flat bearing) 5 is fitted into the inner peripheral surface of the through hole 4 at the front end thereof, and a supported portion 6 at the front end of the pinion shaft 2 is rotatably supported. 7 is a thrust washer (flat washer) interposed between the stepped portion 8 formed on the outer periphery of the pinion shaft 2 and the groove 9 formed on the inner peripheral surface of the protruding portion 3; 10 is a stopper; A ring 11 is a ring that engages the retaining ring 10 in a groove 12 formed on the pinion shaft 2, and a ring 13 is fitted into a stepped portion 14 formed at the tip of the protruding portion 3 to secure the above-mentioned bearing. This is a cap that seals the device.

Next, the operation of the above configuration will be explained. A pinion (not shown) spline-fitted onto the pinion shaft 2 is moved forward and projected to a position where it comes into contact with the stopper 10, whereby the pinion is engaged with a ring gear of the engine (not shown). As a result, the rotational force of the pinion shaft 2 is transmitted to the engine via the pinion and ring gear, and the engine is started. By the way, the above-mentioned protrusion force of the pinion is received by the protrusion 3 via the thrust washer 7, and at the same time, the gear engagement reaction force (radial load) generated between the pinion and the ring gear is applied to the pinion shaft 2. The pressure is transmitted and received by the protruding portion 3 via the bearing portion 6 and the sleeve bearing 5.

As described above, in the conventional device, the thrust load of the pinion shaft 2 is transferred to the protruding portion 3 by the thrust washer 7.
Since the structure is such that pressure is transmitted and received by the front machine frame, there are drawbacks such as an impact load being generated on the front machine frame and the device structure being complicated and expensive.

This idea was made to eliminate the drawbacks of the conventional ones as mentioned above, and by interposing a disc spring between the pinion shaft and the front machine frame, it had the excellent effects described below. The purpose is to provide something.

Hereinafter, embodiments of this invention will be described with reference to the drawings. In Fig. 2, 15 is a starter, 16 is a protruding part of the front machine frame constructed by aluminum alloy die-casting, and a through hole 17 with a step 20 is provided at the tip. A sleeve bearing 18 is fitted into the large diameter portion of the hole. Reference numeral 19 designates a disc spring interposed between the step portion 20 and the front end of the pinion shaft 21, and 19a represents a hole drilled in this spring 19. The rest of the configuration is the same as that of the apparatus shown in FIG. 1 above, so the explanation will be omitted.

In this way, the thrust load of the pinion shaft 21 is elastically received by the disc spring 19, so the impact load generated on the device is alleviated, and the thrust gap (end play) generated when the pinion shaft 21 is assembled is reduced. ) is automatically adjusted (the gap is removed by the elastic deformation of the disc spring 19). The disc spring 19 can also be used as a cap 13 attached to a conventional device.

Note that the disc spring may be a plate spring having a shape other than a donut shape.

As described above, according to this invention, since the disc spring that receives the thrust load of the pinion shaft is interposed between the pinion shaft and the front machine frame, the shock load of the device is effectively alleviated, and the device assembly is easy. In addition to being easy to work with, it has extremely excellent effects such as being able to be obtained at low cost with a simple configuration without increasing the size in the axial direction and without compromising compatibility with conventional devices.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional device, FIG. 2a is a sectional view of the front end of a starter according to an embodiment of the invention,
FIG. 2b is a plan view of the main components of FIG. 2a. In the figure, 2 and 21 are pinion shafts, 3 and 16 are protruding parts, 5 is a sleeve bearing, and 19 is a disc spring. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] In a front nose type starter having a configuration in which the front end of the pinion shaft is pivotally supported by the front machine frame,
A disc spring that receives the thrust load of the pinion shaft and serves as a cap is interposed between the step provided at the front end of the front machine frame protrusion and the front end surface of the pinion shaft. Starter.