JPS5813104Y2 - engine recoil starter - Google Patents

Description

[Detailed explanation of the idea] This invention relates to an engine glue coil starter.

In conventional glue coil starters, foreign matter such as muddy water, dirt, and dust that enters through the air intake port formed in the starter case enters the spiral gap of the recoil spring, preventing the spring from contracting or expanding, making it difficult to pull out the rope. Becoming,
The rope unwinds slowly or insufficiently.

In order to solve the above-mentioned problems, this invention uses a sealing member such as a rubber seal to seal the outer peripheral space of the recoil spring between the rope take-up reel and the starter case.

Also, when the reel is driven and rotated, it is forced to move away from the starter case to prevent the sealing body from being rubbed by the reel (or starter case), which will cause the sealing body to wear out early in the morning. This is to eliminate the problem of

Examples of this invention will be described below based on the drawings.

FIG. 1 is a longitudinal sectional side view of a main part of a forced air-cooled engine, and FIG. 2 is a sectional view taken along line 11--H in FIG.

In the figure, 1 is a crankcase, 2 is a crankshaft, 3 is a cooling fan fixed to the crankshaft 2 and its tip, and 4 is a fan case that covers the outer surface of the cooling fan 3.

An air intake 1'' 5 is formed in a portion of the fan case 4 facing the cooling fan 3, and a recoil starter 6 is attached to the fan case 4 so as to cover the air intake 5.

The recoil starter 6 is based on a bowl-shaped starter case 7. A reel shaft 8 is fixed to the center of the inner surface of the end wall of the starter case 7, and a reel 10 for winding the starting rope 9 and a friction plate 11 are attached to the reel shaft 8-L. Support reel 10 and starter case 7
A coil spring 12 is disposed between the reel 10 and the end wall of the reel 10 to urge the reel 10 back.

An engagement pawl 14 for transmitting starting power to the passive pulley 13 is provided inside the friction plate 11 .

Further, a cover 15 is provided between the recoil spring 12 and the end wall of the starter case 7, which also serves as an outer end support member of the recoil spring 12.

The starting power of the recoil starter 6 is transmitted from the engaging pawl 14 to the crankshaft 2 through the passive pulley 13 and the cooling fan 3 in this order.
can be conveyed to.

As shown in FIG. 2, the outer peripheral space of the recoil spring 12 between the cover 15 and the reel 10 is hermetically surrounded by a ring-shaped sealing body 17.

This sealing body 17 is made of a rubber sealing material,
It is fixed to the cover 15 by baking.

In order to prevent the sealing body 17 from being worn out due to sliding friction between the sealing body 17 and the side wall of the knoll 10, a rotation-linear motion conversion mechanism C is provided.

As shown in FIG. 3, the rotation-linear motion conversion mechanism C is formed in the proximal end boss portion 18 of the reel 10 and has a threaded hole 18a;
It consists of a threaded portion 8a formed on the reel shaft 8 and screwed into a threaded hole 18a.

By this mechanism C, when the reel 10 is driven and rotated by the starting rope 9, the reel 10 is forcibly moved toward the tip side of the reel shaft 8, and a gap is created between the side wall of the reel 10 and the end surface of the sealing body 17. let

Reference numeral 19 in the figure is a connecting pin for supporting the inner end of the recoil spring 12 on the reel 10.

FIG. 4 shows a modification of the sealing body 17, in which the sealing body 17 is shaped with a shape-retaining ring 17b made of a metal plate and a sealing tool 17a made of felt, and this is attached to the reel 10. It is designed to be fixed at .

FIG. 5 shows a modification of the rotation-linear motion conversion mechanism C.

In this case, the reel 10 is connected to the reel shaft 8 via the free rotation boss 20.
The proximal end boss 18 is supported, and the grooved cam 21 is supported on the proximal end boss 18.
In addition, a force-id pin 22 that engages with a grooved cam 21 is implanted in the free rotation boss 20, and a friction spring 23 is brought into elastic contact with the end surface of the boss 20.

In this case, the reel 10 is rotated only at the beginning of the driving rotation of the reel 10.
is advanced and moved, and thereafter the free spinning boss 20 rotates together with the reel 10.

As explained above, in this invention, the outer circumferential space of the recoil spring between the reel and the starter case is covered with a sealing body to prevent foreign matter such as muddy water, dirt, and dust from entering the recoil spring. Therefore, the expansion or contraction of the recoil spring will not be hindered by the intrusion of foreign matter, and the recoil starter can always be operated reliably, and its durability can be improved.

Also, when operating the starting rope to drive and rotate the reel,
The reel is forcibly moved toward the tip of the reel shaft by the rotation-linear motion conversion mechanism, and a gap is formed between the reel and the sealing body, or between the sealing body and the starter case, so that the sealing body slides. Since it is designed to prevent rubbing, the durability of the sealing body can be improved, and the starting rope can be easily operated.

[Brief explanation of drawings]

The drawings show an embodiment of this invention; FIG. 1 is a vertical side view of the main part of a forced air-cooled engine, FIG. 2 is a sectional view taken along the line II--II of FIG. This figure is a sectional view of the main part corresponding to FIG. 1 showing a modification of the sealing body, and FIG. 5 is a sectional view of the main part showing a modification of the reel advancing mechanism. 6... Recoil starter, 7... Starter case, 8... Reel shaft, 9...
Starting rope, 10...Reel, 12...
・Recoil spring, 17...Sealing body, C...
・Rotation-linear motion conversion mechanism.

Claims (1)

[Scope of utility model registration request] A reel shaft 8 is provided protruding from the inner surface of the starter case 7 of the no-coil starter 6, and a reel 10 for winding the starting rope 9 is rotatably and slidably supported on the reel shaft 8.
A coil spring 12 is disposed between the reel 10 and the starter case 7, and a sealing body 17 for preventing foreign matter from entering, which surrounds the outer circumferential space of the recoil spring 12, is attached to the reel 10.
A rotation-linear motion conversion mechanism C is attached to at least one side of the starter case 7 and extends between the reel 10 and the reel shaft 8, whereby the reel 10 is attached to at least one side of the starter case 7.
An engine coil starter characterized in that it is configured so that it is in contact with the other body via a sealing member 17 when not being driven, and is in a separated state when being driven and rotated.