JP3237008B2 - Recoil starter for internal combustion engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal combustion engine having a structure in which a rope rewinding reel supported by a recoil spring is supported on a center shaft provided in a starter case. More particularly, the present invention relates to a recoil starter for an internal combustion engine in which a connection portion of an inner end of a recoil spring to a center shaft is improved.

[0002]

2. Description of the Related Art Conventionally, as shown in FIGS. 4 and 5, for example, a slit 32 or a square hole 33 having both ends closed (no cut-off portion on the entire circumference) is formed on a wall surface of a cylindrical center shaft 31. There is a type in which a U-shaped inner end hook of a recoil spring is hooked on one side edge thereof.

[0003] However, since the entire periphery of the slit 32 and the square hole 33 provided in the center shaft 31 is not cut off, the number of molds is reduced when these are obtained by a synthetic resin molding method. Not only is it not suitable for cost reduction due to the increased number of steps, but also if the U-shaped inner end hook of the recoil spring has come off due to an accident such as rope breakage during use, End hook is slit 32
There are relatively many cases in which the material enters into the center shaft 31 through the square hole 33 or is hooked on the other side edge in an abnormal manner and is deformed.

The inventor of the present invention has found a recoil starter for an internal combustion engine according to the present invention, while trying various improvement means in order to improve the above-mentioned problems.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a new recoil starter for an internal combustion engine which solves the above-mentioned problems, that is, achieves cost reduction and deformation accident avoidance. is there.

[0006]

In order to achieve the above object, a recoil starter for an internal combustion engine according to the present invention supports a rope rewind reel which is wound back by a recoil spring with respect to a center shaft provided in a starter case. In a recoil starter for an internal combustion engine that starts an internal combustion engine by pulling out a rope wound on a reel, the starter case is formed by hard plastic molding.
Then, attach a rod-shaped support shaft to the center of the starter case.
A cylindrical center shaft at the location surrounding the support shaft
A large number of ribs that reinforce the same space between the support shaft and center shaft
Stand together during the above molding and
A deep slit is formed at the tip edge of the cylindrical center shaft during the above molding.
To form a hooking edge for the inner end, and
Single perimeter edge and an inner end for hooking edge in the slits of the ribs
To the edge facing the protective wall is formed as a connecting state and the inner end of the recoil spring the inner end hook portion provided by folding in a U-shape, a hook portion for the inner end to the hooking edge for the inner end It is hung and a recoil spring is wound around the center shaft.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the embodiment shown in the drawings, a substantially dish-shaped starter case 3 in which a large number of mounting holes 2 to a fan case 1 on an engine (not shown) side are provided around an opening edge is formed by hard plastic molding. A rod-shaped support shaft 4 is provided at the center of the starter case 3, a cylindrical center shaft 5 is provided at a position surrounding the support shaft 4, and a space between the support shaft 4 and the center shaft 5 is provided. A plurality of ribs 6 to be reinforced are erected together at the time of the molding, and a slit 7 having a depth reaching the base edge at the distal end edge of the cylindrical center shaft 5 is provided together at the time of the molding to form an inner end. The hooking edge 9 is formed, and the outer edge of one of the ribs 6 and the edge 10 of the slit 7 facing the inner edge hooking edge 9 are connected to form a defense wall 11 .
You.

A reel 13 is rotatably supported on the center shaft 5, and an inward flange 15 is provided at an inner edge of a boss 14 of the reel 13, and the flange 15 is attached to the center shaft 5.
And retains the retainer 16 at the distal end of the support shaft 4 with an internal tooth type fastener spring 17, and clamps the brake coil spring 18 between the inside of the retainer 16 and the rib 6 in a compressed state. I do.

The rope 2 is inserted into the rope groove 19 of the reel 13.
0 is wound, and a circular spring chamber 21 having the center shaft 5 as a center is provided on the outer side surface of the reel 13.
A recoil spring 24 having an outer end hook portion 22 (the outer end hook portion is not shown) is inserted, and the inner end side hook portion 22 of the recoil spring 24 is hooked on the hook portion edge 9. The recoil spring 24 applies a rotating force to the reel 13 in the rewinding direction of the rope 20.

A cylindrical wall 25 facing the reel 13 is integrally provided on an outer peripheral edge of the retainer 16 so that a distal end edge of the cylindrical wall 25 is close to an inner side surface of the reel 13. A ring-shaped engagement / disengagement member 26 is provided on the outer periphery of the cylindrical wall 25 so as to be freely movable toward and away from the reel 13.
A cam 27 and a cam follow 28 for moving the engaging / disengaging member 26 closer and farther are provided on the inner side surface of the engine 3 and a flywheel (see FIG. (Not shown)
Is provided, and when the rotation speed of the flywheel exceeds the rotation speed of the reel 13, the engagement claw 29 is provided.
Is disengaged from the engaging portion so that the disengaging member 26 returns to the reel 13 side.

[0011]

According to the recoil starter for an internal combustion engine according to the present invention, the starter case is formed by molding a hard plastic.
And a rod-shaped support shaft at the center of this starter case,
Also, replace the cylindrical center shaft at the location surrounding the support shaft.
The support shaft and the center shaft
Ribs should be erected together during the above molding and
A deep slit is formed at the leading edge of the cylindrical
Together to form a hooking edge for the inner end, and
Hook for inner edge at outer edge and slit of one rib inside
Since the defense wall is formed by connecting the edge facing the edge to the edge, the number of molds and the number of steps can be reduced when obtaining by a synthetic resin molding method, which is suitable for cost reduction. For the inner end of the slit
Connects the edge facing the hooking edge and the outer edge of one rib
When the recoil spring is hooked on the hook for the inner end and the recoil spring is wound around the center shaft, an accident such as a broken rope may occur. Even if the inner end hook part comes off, the hook part is guarded by the defense wall and does not enter the center axis or get caught in an abnormal manner, thus avoiding the deformation accident. It can be achieved sufficiently.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a perspective view of a main part in the same manner.

FIG. 3 is a sectional view taken along the line AA of FIG. 2;

FIG. 4 is a perspective view showing a conventional example.

FIG. 5 is a perspective view showing another conventional example.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 fan case 2 mounting hole 3 starter case 4 support shaft 5 center shaft 6 rib 7 slit 9 hooking edge for inner end 10 edge 11 defense wall 13 reel 14 boss 15 inward flange 16 retainer 17 internal tooth type fastener spring 18 brake coil spring DESCRIPTION OF SYMBOLS 19 Rope groove 20 Rope 21 Spring chamber 22 Inner end hook part 24 Recoil spring 25 Cylindrical wall 26 Member for disengagement 27 Cam 28 Cam follow 29 Engagement claw 31 Center shaft 32 Slit 33 Square hole

Claims (1)

(57) [Claims] A recoil coil for an internal combustion engine, which starts the internal combustion engine by pulling out a rope wound on a reel, wherein the rope rewind reel is wound back by a recoil spring with respect to a center shaft provided in a starter case. Hard starter case for starter
Constructed by tick molding, the center piece of this starter case
Rod-shaped support shaft at the place, and cylindrical shape at the place surrounding the support shaft
Center shaft, and between these support shafts and center shaft
A number of ribs to reinforce
At the end of the cylindrical center shaft.
A lit is provided together with the above molding to form a hooking edge for the inner end.
And the outer edge and slit of one of the ribs
And the edge facing the hooking edge for the inner end
To form a defense wall, and connect the inner end of the recoil spring to U
A recoil starter for an internal combustion engine, wherein the recoil starter is provided with a hook portion for an inner end provided in a shape of a letter, the hook portion for the inner end is hooked on the hooking edge for the inner end, and a recoil spring is wound around a center shaft.