JPS6117256Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a pinion shift mechanism of an engine starting device.

A conventional device of this type is shown in Fig. 1. In Fig. 1a, 1 is a shift lever, and a pinion (not shown) is attached to the other end of the lever.
is a burring-out portion of the shift lever 1, which is a fulcrum when the shift lever 1 is rotated. 2 is a holder molded from a synthetic resin material such as nylon, and is loosely fitted into the burring portion 1a. Fig. 1b shows the lever assembly of Fig. 1a mounted on an engine starting device, in which 3 is an electromagnetic switch that rotates the shift lever 1 when biased, 4 is a movable iron core, the end of which engages with the lever 1 and drives the lever 1 by the bias of the electromagnetic switch 3. 5 is a front bracket that houses the above-mentioned mechanism components, 6 is a spring that biases the shift lever 1 toward the front bracket via the holder 2, and 7 is a packing made of a synthetic rubber material or the like, which receives the pressure of the spring 6.

Next, the operation of the device configured as described above will be explained. Now, when the key switch of the engine (not shown) is closed and the electromagnetic switch 3 is energized, the movable iron core 4 is attracted to the left in the figure, thereby rotating the lever 1 about the fulcrum 1a. Lever 1 above
An overrunning clutch (not shown) and a pinion that engages the clutch are attached to the other end, and the clutch is moved forward, so that the pinion gear that engages the clutch is engaged with a ring gear (not shown) of the engine. let By the way, when the pinion gear and the ring gear are in contact with each other at their end faces and do not mesh, the spring 6 is deflected by the attraction force of the electromagnetic switch 3, which further increases the pressing force of the pinion gear on the end face of the ring gear and causes the electromagnetic The main contact of the switch 3 is closed, and rotational force is applied to the pinion gear to facilitate meshing with the ring gear. In this way, the engine is started by the engagement of the pinion gear and ring gear. Note that after the engine is started, the biasing force of the electromagnetic switch 3 is released, so that the shift mechanism returns to its original state.

By the way, since the conventional shift mechanism of this type of device is constructed as described above, the lever fulcrum portion 1a
Furthermore, since the holder 2 is attached to the shift lever 1, the structure is complicated and requires many assembly steps, resulting in high costs.

This idea was made in order to eliminate the drawbacks of the conventional ones as mentioned above.By forming the rotational fulcrum of the shift lever on the front bracket, the burring process of the lever fulcrum was abolished and the holder was removed. In addition, the contact part of the shift lever with the coil spring is formed into an arc shape for easy sliding, resulting in an engine that is easy to assemble, has a simple structure, and has smooth shifting operations. The purpose is to provide a pinion shift mechanism for a starting device.

This invention will be explained below based on an embodiment shown in FIGS. 2a and 2b. In the figure, reference numeral 8 denotes a shift lever, one end of which is engaged with the movable iron core 4, and the other end of which is engaged with an overrunning clutch to which a pinion gear (not shown) is fixed. 8a, 8b
9 is a convex arcuate surface formed at each end of the pivoting fulcrum of the shift lever, and 9 is a front bracket, which is a circle having a radius r ₁ from the pivot center P of the pivoting fulcrum of the shift lever 8. It has a concave arcuate surface 9a on its circumference that can slidably fit with the arcuate surface 8a of the shift lever 8. 9b is a bifurcated protrusion formed to hold the rotational fulcrum of the shift lever 8; 10 is a conical coil spring inserted into the protrusion 9b; shift lever 8
The convex arcuate surface 8b of the rotational fulcrum portion is biased in the direction of the front bracket 9, and the large diameter portion at the other end is locked to the packing 7. The convex arcuate surface 8b constitutes an arcuate surface with a radius r ₂ centered on the rotation center P, and the spring 1
The conical shape of 0 makes the arcuate protrusion compact, and the center P with respect to the spring 10 is
When rotating against each other, the sliding properties at the abutting portions are good.

In the above embodiment, the shift lever 8 is formed with a convex arcuate surface at the contact portion between the front bracket 9 and the shift lever 8 and the contact portion between the lever 8 and the conical coil spring 10. However, both ends of the rotation fulcrum of the shift lever 8 each form a concave arcuate surface,
The front bracket 9 is formed with a convex arcuate surface so as to slidably fit into each of these arcuate surfaces, and the shape of the abutting tip of the coil spring 10 is changed to facilitate rotation. The same effect can be achieved as well.

As described above, this invention forms one end of the pivoting fulcrum of the shift lever and the sliding surface of the bracket that comes into sliding contact with one end of the pivoting fulcrum in each arc shape so that they can fit into each other, and the coil The other end of the rotational fulcrum of the shift lever that is pressed against the spring is formed into an arc shape, and the arcuate surfaces formed on each end surface of the shift lever have their respective centers approximately at the same point at the rotational fulcrum of the shift lever. Since it is formed at a single point, there is no need to perform burring on the pivot point of the lever as in the past, and a holder for the shift lever can be eliminated, making the structure simple and easy to assemble. Moreover, the arcuate surfaces formed on each end face of the shift lever can be formed extremely accurately and easily, and the shift lever can rotate extremely smoothly and the pinion shift operation can be highly reliable. be.

[Brief explanation of the drawing]

Fig. 1a is a front view for explaining a conventional lever mechanism, Fig. 1b is a cross-sectional configuration diagram when the lever mechanism of Fig. 1a is attached to an engine starting device, and Fig. 2a is a front view for explaining the conventional lever mechanism. FIG. 2b is a cross-sectional configuration diagram for explaining a shift mechanism according to an embodiment, and FIG. 2b is a cross-sectional view taken along the line A--A in FIG. 2a. In the figure, 1 and 8 are shift levers, 2 is a holder, 3 is an electromagnetic switch, 5 and 9 are front brackets, 8a and 8b are arcuate surfaces, 9a is an arcuate surface, 9b is a protrusion, and 6 is a cylindrical coil. The spring 10 is a conical coil spring. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A shift lever that is housed in the front bracket and rotates against a coil spring under the bias of an electromagnetic switch to move a pinion and engage the pinion with an engine ring gear. The one end of the pivoting fulcrum of the shift lever and the sliding surface of the bracket that makes sliding contact with the one end of the pivoting fulcrum are each formed into an arc shape so as to be able to fit into each other, and the coil spring The other end of the pivoting fulcrum of the shift lever that is pressed against is formed in an arc shape, and the arcuate surfaces formed on each end surface of the shift lever have their respective centers at the pivoting fulcrum of the shift lever. A pinion shift mechanism for an engine starting device, characterized in that the pinion shift mechanism is formed so that the points are substantially the same. (2) The pinion shift mechanism for an engine starting device according to claim 1, wherein the coil spring has a conical shape.