JPS6237958Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recoil starter for an internal combustion engine.

The prior art related to this invention is
There is a recoil starter as shown in Figure 2 of Japanese Patent No. 48222. The washer of this recoil starter is fixed to a shaft so as to rotate about the axis of the case, and one plate-shaped end of the washer is placed between two protrusions on a ratchet (dog). However, since this washer is fixed to the shaft, if the protrusion of the ratchet comes into contact with one end of the washer, the protrusion will come into impact with one end of the washer, causing breakage.

Also, since one protrusion strongly contacts one end of the washer fixed to the shaft, the ratchet returns as if rebounding and the other protrusion abuts one end of the washer. Therefore, the ratchet oscillates as if vibrating, resulting in poor engagement between the pulley and the ratchet, and furthermore, the engagement portion between the ratchet and the pulley often suffers wear and tear.

Next, as another prior art, there is a recoil starter shown in FIG. 3 of Japanese Utility Model Application No. 53-7524.
This recoil starter is arranged such that a friction spring fits into the shaft portion of the housing via an annular portion, and linear clamping portions at both ends clamp one protrusion of the ratchet from both sides.
When the protrusion of the friction spring comes into contact with the holding part, the fit between the shaft part and the shaft part is weakened, so that the shaft part and the friction spring rotate. Therefore, the acting force for moving the ratchet outward is weak, and it is difficult to quickly lock the ratchet to the protrusion of the housing.

The present invention has been developed to eliminate the above-mentioned drawbacks, and its technical objectives are to simplify assembly, minimize damage to the engaging portion of the dog, and ensure that the dog quickly engages the pulley during startup. It's about letting people know.

Therefore, the technical means of the present invention is configured as follows. In other words, the recoil is formed by arranging a dog that is rotatably held on a shaft fixed to a housing and a retainer fixed to one end of the shaft, and a dog that swingably engages one end with the reel. 2 on the other end of the dog in the starter.
The annular part of the friction spring has a substantially annular annular part and a straight part extending in a substantially radial direction from the annular part. It fits into the wound shape and the straight part is inserted between the two protrusions of the dog.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of the recoil starter of the present invention. Further, FIGS. 2 to 6 are side views of the dog and the friction spring at each operating position.

In FIG. 1, 1 is a housing of a recoil starter, and a shaft 3 is fixed to the inside of the housing.
A reel 5 is rotatably attached to this shaft 3.

On the other hand, a retainer 7 having a shaft portion 8 formed thereon is fixed to one end of the shaft 3 by a center screw 9.

A concave groove 6 for accommodating the rope 2 is formed on the outer periphery of the reel 5. Further, a spiral spring 4 is arranged between the reel 5 and the housing 1.

The outer peripheral end of the spiral spring 4 is fixed to the housing 1, and the inner peripheral end thereof is fixed to the reel 5.

A dog 10 is provided between the retainer 7 and the reel 5. As shown in FIG. 2, a third protrusion 13 is provided at one end of the dog 10, and a first protrusion 11 and a second protrusion 12 are provided near the other end in the circumferential direction. are provided with a gap between them. Furthermore, the third protrusion 13 engages with a hole provided in the reel 5. On the other hand, the annular part 16 at one end of the friction spring 15 is wound around the shaft part 8 of the retainer 7, and the straight part 17 at the other end passes between the first protrusion 11 and the second protrusion 12. and extends radially outward. On the other hand, a cup-shaped pulley 19 connected to the engine is provided on the engine side, and a plurality of protrusions 20 (three in the figure) extending in the axial direction are formed at the outer peripheral tip of the pulley 19.

Next, the operation of the present invention will be explained based on FIGS. 2 to 6.

First, when the rope 2 is pulled, the reel 5 rotates accordingly. When reel 5 spins, dog 10
Similarly, the dog 10 tries to rotate, but the first protrusion 11 provided near the end of the dog 10 is blocked by the straight part 17 of the friction spring 15, and the dog 10
protrudes outward from the state shown by the broken line in FIG. 2 as shown by the solid line, and furthermore, the friction spring 1
5 and rotate as shown in FIG. On this occasion,
As shown in FIG. 5, the engaging protrusion 14 provided on the outer circumference of the dog 10 rotates while being engaged with the protrusion 20 of the pulley 19, and the engine is started.

Then, when the rope 2 is released, the reel 5 is reversed by the spiral spring 4, and as shown in FIG.
0 returns from the broken line state to the solid line state, and as shown in FIG. 6, the engagement between the dog 10 and the pulley 19 is released.

Due to the above-described actions, the present invention has the following effects.

B. A linear friction spring can be installed by simply processing a wire into a square shape and fitting it onto the shaft, so it is extremely easy to bend and assemble to the shaft.

○B When the reel is rotated by the rope, the first protrusion of the dog comes into elastic contact with the straight part of the friction spring and presses the straight part forward, and at this time, the straight part acts like a lever. This increases the friction between the annular portion and the shaft, and holds the annular portion as if it were fixed to the shaft. The protrusion of the dog is guided by the straight portion while absorbing shock, thereby moving the dog outward, thereby achieving the effect of quickly engaging the engagement protrusion with the protrusion.

Furthermore, in the prior art, the washer or friction spring did not function sufficiently, so the dog oscillated as if it were vibrating during the rotation of the pulley and came into contact with the pulley, etc., causing premature wear and damage to the engagement protrusion. When the first protrusion and the second protrusion alternately abut on the straight part of the friction spring, the straight part adjusts the frictional force of the annular part fitted with the shaft part to reduce the friction with the shaft part. It is possible to control the dog from becoming too large or too small, and effectively prevent the dog from being damaged by contact with a pulley or the like.

Further, since the friction spring is formed in a linear shape and has elastic force, it effectively prevents damage to both of the protrusions of the dog due to impact force.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the recoil starter according to the present invention, FIGS. 2 to 4 are explanatory diagrams of its operation, FIG. It is a sectional view showing a non-engaged state shown similarly to the figure. 1...Housing, 2...Rope, 3...Shaft,
4...Spiral spring, 5...Reel, 6...Concave groove, 7
... Retainer, 8 ... Shaft, 9 ... Center screw, 10 ... Dog, 11 ... First protrusion, 12
...Second protrusion, 13...Third protrusion, 14...
Engagement protrusion, 15... Friction spring, 1
6... Annular part, 17... Straight part, 19... Pulley, 20... Projection part.

Claims (1)

[Scope of utility model registration request] A dog whose one end is pivotably engaged with the reel 5 between a reel 5 rotatably held on a shaft 3 fixed to the housing 1 and a retainer 7 fixed to one end of the shaft 3. In the recoil starter, two protrusions 11 and 12 are provided on the other end side of the dog 10, and the recoil starter includes an annular portion 16 having a substantially annular shape and a straight portion 17 extending from the annular portion 16 in an approximately radial direction. The annular portion 16 of the linear friction spring 15 having a
The linear part 17 is wound around the dog 10 side from the straight part 17 to the shaft part 8 or the shaft 3 provided in
Recoil starter inserted between 1 and 12.