JPS626293Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a starter motor for an internal combustion engine, and in particular to a shift lever thereof.

A conventional device of this type is shown in FIG. In the figure, 1 is a ring gear of the engine, 2 is a shift lever of a starter motor, and 3 is an electromagnetic switch for rotationally biasing this shift lever. This electromagnetic switch is composed of the following 4 to 9. That is, 4 is a plunger (movable iron core) that is cam-engaged with the shift lever, 5 is a case, 6 is a fixed iron core fixed to the rear end of the case on the inner peripheral surface of the case 5, and 7 is wound around this fixed iron core. 8 is a return coil spring that presses and biases the plunger 4; 9 is a movable contact shaft that is loosely fitted into the central through hole 6a of the fixed iron core 6; It moves to the left. Next, 10 is a holder that supports the shift lever 2, 11 is a lever spring, and 12 is a grommet that receives pressure from this lever spring. 13 is amateur, 14
1 is a rotating shaft of this armature, and 15 is an overrunning clutch, which is spline-engaged with a helical spline 16 formed at the center of the rotating shaft 14. Reference numeral 17 denotes a ring fitted to the outer peripheral surface of the rear end portion of the clutch outer 18 of the overrunning clutch 15, and is a ring fitted to the outer peripheral surface of the rear end portion of the clutch outer 18 of the overrunning clutch 15.
It constitutes an engagement groove. A pinion 19 is biased into one-way engagement with the overrunning clutch 15, and slides on the rotating shaft 14 by the force of the shift lever 2. Reference numeral 20 denotes a stopper for locking the forward protrusion of the overrunning clutch 15.

Next, the operation of the above configuration will be explained using FIGS. 1 and 2. The electromagnetic switch 3 is energized, the plunger 4 is attracted into the case against the pressing force of the return coil spring 8, and the shift lever 2 is moved from the position A shown by the chain line in FIG. 2 to the position B shown by the solid line.
It is pivoted counterclockwise into position. The above-mentioned _{transfer force is determined by the distance that the plunger 4 travels until it comes into contact with the fixed iron core 6, which is L A in} FIG. Move and transfer the overrunning clutch. This transfer force causes the pinion 19 to
comes into contact with ring gear 1. On the other hand, plunger 4
The movable contact shaft 9 is pressed and biased, a main contact (not shown) is closed, and a main current is passed from a battery (not shown) to the armature 13 through this contact, thereby generating rotational force. This rotational force rotates the pinion 19 by a required angle via the helical spline 16 of the rotating shaft and the overrunning clutch 15, and this is transmitted to the ring gear 1 to crank the engine (not shown). In addition, at this time,
The shift lever 2 moves the overrunning clutch 15 forward almost the entire pinion transfer stroke, but at the same time, the helical spline 16 strongly urges the overrunning clutch 15 forward by the helical force generated by the rotation of the rotating shaft 14, and the ring gear 1 and This ensures meshing engagement with the pinion 19.

In the conventional device as described above, the transfer distance of the overrunning clutch 15 by the shift lever 2 is set so that the ring gear 1 and the pinion 19 are sufficiently engaged (tooth thickness length), and the helical spline has a spiral function. Because of the overlap, the plunger stroke of the electromagnetic switch becomes long, resulting in disadvantages such as the large size and weight of the device.

This invention was made in order to eliminate the drawbacks of the conventional device as described above, and the shift lever is divided into two parts and connected with a hinge structure, which reduces the plunger stroke. The purpose of this invention is to provide a pinion transfer device for an engine starting motor that can be downsized.

An embodiment of this invention will be described below with reference to the drawings. In FIG. 3, 21 is a shift lever assembly, 22 is an upper cam portion, and 23 is a lower cam portion, which are engaged by a hinge mechanism portion (hinge) 24. 2
Reference numeral 5 denotes a pressure spring, which is wound around the fulcrum, one end of which is engaged with the upper cam section 22, and the other end of which is engaged with the lower cam section 23. 26 is the upper cam portion 2
The pin 27 provided at 2 is an elongated hole provided in the lower cam portion 23, and constitutes a cam mechanism that regulates the rotation angle of the hinge mechanism portion 24. 28
is a pin that engages the lower cam portion 23.

Next, the operation of the above configuration will be explained using FIG. 4. The upper cam portion 22 of the shift lever assembly 21 is urged to rotate in the counterclockwise direction shown in the drawing by a plunger (not shown) of an electromagnetic switch (not shown), and the overrunning clutch 15 is moved forward by a stroke L _C shown in the drawing. Then, like the conventional device, the pinion 19 is engaged to the middle position of the ring gear 1. This stroke length L _C is set shorter than the stroke length L _B explained in the conventional device shown in FIG. ) This has the effect of allowing L _A to be set short.
After the pinion 19 and the ring gear 1 are engaged, the rotary shaft 14 receives the rotational force of the armature, and the overrunning clutch 15 is advanced by the helical force of the helical spline 16, and the pinion 19 is brought into contact with the stopper 20. Transport to location. At this time, the lower cam portion 23 of the shift lever assembly 21 is pressed by the washer 17, and the pressing spring 25 is rotated by the rotation of the hinge mechanism portion 24 (rotated counterclockwise) by the amount shown (ΔL) in the figure. bends against the pressure of

After the engine is started, the shift lever assembly 21 is rotated back clockwise by the biasing force of the return spring 8, as described for the conventional device shown in FIG.
In addition, during the above-mentioned return, the pin 26 and the elongated hole 27 abut and engage, the above-mentioned return spring force is applied, and the overrunning clutch 15 returns (pinion 1
9 and ring gear 1).

In addition, although the case where the hinge mechanism was provided in the bending portion of the shift lever has been described above, the same effect can be obtained even if other bending mechanisms are used.

As described above, according to this invention, the shift lever has a bending structure in the transfer direction and is configured to be engaged in a predetermined shape by the biasing force of the spring. This has excellent effects such as being able to shorten the transfer distance (stroke), being easy to remove, and making the device smaller and lighter with a simple configuration.

[Brief explanation of the drawing]

Figure 1 is a configuration diagram showing a conventional device, and Figure 2 is a diagram showing the configuration of a conventional device.
3A is a side view of the main constituent members according to an embodiment of the invention, FIG. 3B is a front view thereof, and FIG. 4 is an operation explanatory view. In the figure, 4 is a plunger, 14 is a rotating shaft, 15 is an overrunning clutch, 16 is a helical spline, 19 is a pinion, 21 is a shift lever assembly, 22 and 23 are individual levers, 24 is a hinge mechanism, and 25 is a press A spring, 26 a pin, and 27 a long hole. In the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims for Utility Model Registration] (1) A shift lever is divided into two parts, these two levers are connected via an elastic body so that they can be bent only in one direction, and this shift lever is a pinion provided on a rotating shaft. 1. A pinion transfer device for an engine starting motor, characterized in that the pinion transfer device is arranged so as to bend only in the counter-biasing direction. (2) A pinion transfer device for an engine starter motor according to claim 1, wherein two levers are connected via a hinge mechanism, and a spring is secured between the two levers. (3) A pinion transfer device for an engine starting motor according to claim 2, wherein a pin disposed on one lever is fitted into an elongated hole disposed on the other lever.