JPS6135728Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improved structure of an overrunning clutch device used in an electromagnetic push type internal combustion engine starting motor.

First, a conventional device of this type will be explained with reference to FIG.

That is, in FIG. 1, reference numeral 1 denotes an armature shaft (hereinafter referred to as shaft) which is a rotating shaft driven by a starter motor and has a circular diameter section 2, a spline section 3, and a large diameter section 4. Reference numeral 5 has a spline 6 which is a slider and can be engaged with the spline part 3 and can be screwed thereon, and a locking part 7 which can be engaged with the end surface of the large diameter part 4 at the inner peripheral part of the left end. It has an eccentricity regulating ring 8 which regulates the eccentricity of the slider 5 with respect to the shaft 1 by forming a small gap with the cross-sectional circular diameter portion 2 of the shaft 1. This eccentric ring 8 is press-fitted into a recess 10a provided in a first clutch main body 10, which will be described later. Reference numeral 9 denotes a groove having a U-shaped cross section provided in the slider 5, in which a pinion moving lever (not shown) is engaged. Numeral 10 is a first clutch body provided at the tip of the slider 5, and 11 is a pinion, which has a second clutch body 12 made of a cylindrical projection. A metal member 13 is press-fitted into the inner circumference of the pinion 11. Further, the first clutch main body 10 has a plurality of recesses, and the inner surface 14, which is a wedge surface, is eccentric with respect to the outer peripheral surface of the second clutch main body 12. A roller 15 is inserted into each of the recesses. 16 is the second clutch main body 1
2 is a washer that prevents it from flying out in the axial direction; 17 is a gasket that is press-welded to this washer 16; 18 is a case that houses the parts forming the overrunning clutch; 19 is an engine that can mesh with the pinion 11; It is a ring gear.

As is well known in the art, the operation of this type of conventional device is such that when a starter motor (not shown) is turned on to start an internal combustion engine, the overrunning clutch and pinion 11 are pushed out by a lever (not shown) at the same time as the motor rotates. mesh. At this time, the pinion 11 is connected to the armature via the slider 5, the first clutch main body 10, and the roller 15, and rotates together with the armature to start the internal combustion engine.

When the engine starts, the connection between the first clutch body 10 and the pinion 11 is released due to the relationship between the inner surface 14 of the first clutch body 10 and the second clutch body 12 of the pinion 11, and the action of the roller 15 inserted therebetween. Only the pinion 11 is idled by the ring gear 19 to prevent the armature from rotating at high speed.

In this overrun state of the pinion 11,
In order to obtain stable overrun characteristics, an eccentricity regulating ring 8 is provided to suppress the amount of eccentricity of the first clutch main body 10 with respect to the shaft 1.

The role of the eccentricity regulating ring 8 is to transmit the centrifugal force to the shaft 1 so that the centrifugal force caused by the eccentric center of gravity of the first clutch main body 10 with respect to the shaft 1 does not act on the overrunning clutch portion and increase the drag torque of the roller 15 portion. It is designed to absorb water.

By the way, in the above conventional device, in order to position the overrunning clutch in the axial direction, a locking portion 7 is formed at the left end of the slider 5, and this locking portion 7 is connected to the right end of the large diameter portion 4 of the shaft 1. He was doing it so that it was in contact with the

However, since the first clutch main body 10 integral with the slider 5 is formed by cold forging, in order to form the locking part 7 after the cold forging process,
Since the left end face of the slider 5 must be cut using a lathe or the like, one step of different processing must be added, which has the disadvantage of complicating the manufacturing process.

In order to solve the above-mentioned drawbacks, this invention uses a locking part of an annular opposing part for eccentricity control, which is integrally molded with the first clutch main body, to determine the axial position of the overrunning clutch in a stationary state. To provide an excellent overrunning clutch device for starting an engine that is easy to manufacture by allowing the main body of the clutch and the positioning portion to be processed in the same processing process.

An embodiment of this invention shown in FIG. 2 will be described below.

In FIG. 2, reference numeral 20 denotes an annular opposing portion for regulating eccentricity formed in the same process during cold forging of the first clutch main body 10.
The amount of eccentricity with respect to the shaft 1 is suppressed.

Reference numeral 20a denotes a locking portion formed on the left end surface of this annular opposing portion, which is formed at the same time as the annular opposing portion 20 is formed, and is attached to the right end of the spline portion 3 of the shaft 1 when the overrunning clutch is at rest, that is, when it is not in operation. The overrunning clutch is engaged with the surface to position the overrunning clutch in the axial direction.

That is, in this embodiment, the annular opposing portion 20 and the locking portion 20a can be formed at the same time during cold forging of the first clutch main body 10, which greatly simplifies manufacturing.

In the above description, the first clutch main body 10 and the annular opposing portion 20 are formed by cold forging, but any other integral molding method may be used.

As described above, in this invention, the axial position of the overrunning clutch in the stationary state is
Since positioning is performed by the abutment surface between the locking part of the annular opposing part integrally molded with the clutch main body and the spline provided on the rotating shaft, the positioning part in the axial direction of the overrunning clutch is Since the clutch main body can be machined in the same process at the same time, the processing is extremely easy and the processing time is reduced compared to the conventional method in which the first clutch main body and its positioning part are manufactured using different processes. This has the effect of making production even easier.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a conventional device, and FIG. 2 is a sectional view showing an embodiment of this invention. In the figure, 1 is an armature shaft, 3 is a spline part, 5 is a slider, 6 is a spline part, 10 is a first clutch main body, 11 is a pinion, 12 is a second clutch main body, 14 is an inner surface, 15 is a roller, 19 is a ring gear, 20 is an annular opposing portion, and 20a is a locking portion. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] a rotating shaft driven by a starter motor; a first clutch main body that is spline-fitted to the shaft and movable in the axial direction with respect to the shaft; a first clutch that is connected to the first clutch main body via a wedge surface; a second clutch main body that forms an overrunning clutch together with the main clutch; a pinion that is connected to the second clutch main body and meshes with the ring gear of the engine; and an eccentricity between the shaft and the first clutch main body. An annular opposing portion is formed on the opposite side of the pinion in the annular opposing portion and abuts against an end surface on the pinion side of the helical spline of the shaft. An overrunning clutch device for starting an engine, characterized in that it is provided with a locking portion for axially positioning the overrunning clutch in a stationary state.