JPS6033342Y2 - recoil starter - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a glue coil starter for small internal combustion engines.

Conventional mechanisms of this type, such as coil starters that use the restoring force of a mainspring to wind the rope onto a reel, are equipped with a rotatable holding plate that supports the entire internal island and a spring that controls it. There are two types: one has a mechanism in which a ratchet attached to the reel is moved in and out using a restraining plate, and the other has a mechanism in which the restraining plate is fixed and a substantially U-shaped spring and a tongue spring are used in combination, or two springs are integrated.

In the former case, the holding plate rotates, so when the handle is returned rapidly, or when the ratchet pops out due to vibration during operation,
In addition, it is difficult to dust-proof the rotating portion of the restraining plate, resulting in drawbacks such as unreliable operation of the ratchet.

Also, in the latter case, the U-shaped spring has a very high spring constant, so the frictional resistance tends to vary, the rope will not return unless a high-torque mainspring is used, and the ratchet is not fully prevented from popping out, so It had to be provided with the function of an elastically deformable tongue spring, which resulted in a complicated mechanism.

The present invention aims to eliminate such conventional drawbacks and provide an inexpensive coil starter that is simple, reliable, and operates by improving the coil starter proposed by the applicant.

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

FIG. 1 is a longitudinal sectional side view of the recoil starter of the present invention during operation.

In the figure, 1 is a starting pulley attached to the engine.

2 is a starter case, and a shaft 3 is fixed inside the center thereof.

4 is a starter rope, and a reel 5 winds this rope 4.
is supported on the shaft 3 and acts to constantly rewind the rope 4 pulled out by the mainspring 6 onto the reel 5.

Reference numeral 7 denotes a pawl shaft attached to the reel 5, and the pawl shaft 7 has an arc-shaped engaging portion 8a that engages with the pulley 1 on one side and a receiving portion 8b on the other side, as shown in FIG. A claw 8 is supported approximately at the center thereof.

When the claw 8 is retracted (the state shown in FIG. 2), the end of the engaging portion 8a of the claw 8 comes into contact with one end 5a' of the arc-shaped side wall 5a provided on the reeler 5, and the other end The receiver faces 5a'' so that the end of the portion 8b is substantially in contact with the receiver.

This is to prevent dust from entering as much as possible.

Reference numeral 9 denotes a coil spring, and a friction arm 10 is inserted into the shaft 3 at the end thereof, and is compressed by a restraining plate 12 fixed to the shaft 3 by a nut 11, so that it can rotate with frictional resistance against the shaft 3. There is.

Also, one end 10a of the friction arm 10 acts on the inside of the engaging part 8a of the claw 8 to push up the tip of the retaining part 8a, and when the claw 8 is retracted, the end lea is moved to the receiving part 8b.
It is designed to fit inside.

Therefore, the receiver forms an arcuate surface centered on the shaft 3 when the claw 8 is recessed inside the portion 8b.

The restraining plate 12 is configured to cover the circular circumference formed by the side wall 5a and the claws 8 to prevent dust from entering inside.

Next, the operation of the present invention constructed in this way will be explained with reference to FIGS. 2 and 5.

First, in order to start the engine, when the starter rope 4 is pulled, the reel 5 rotates in the direction of the arrow in the state shown in Fig. 2.
The claw 8 also rotates in the same way.

However, since the friction arm 10 is attached to the shaft 3 independently of the reel 5, it does not rotate and its end 10
The receiver 8b comes off from the inside of the portion 8b, resulting in the state shown in FIG.

Here, the other end lea of the friction arm 10 contacts the inside of the engaging portion 8a of the claw 8, pushes up the tip of the engaging portion 8a outward, and engages with the pulley 1.

That is, the state shown in FIG. 4 is reached. Note that 5b is a stopper for the claw 8 at that time, and is provided on the reel 5.

In this state, when the rope 4 is further pulled, the end 10a of the friction arm 10 and the inside of the engaging part 8a remain in contact with each other, overcoming the frictional resistance of the coil spring 9 and rotating at the same time, starting the engine. .

When you try to return the rope 4 after starting, the reel 5 rotates in the opposite direction to the arrow due to the action of the mainspring 6, and the friction arm 10 remains in that position, so the engaging part 8a and the end 10a of the friction arm 10 are When separated, the engaging part 8a is pushed in by the pulley 1, and conversely, the receiving part 8a is pushed in by the pulley 1.
b comes into contact with one end 10b, and the claw 8 attempts to retract as shown in FIG.

When the rotation is further reversed, the claw 8 is completely recessed, and the end portion 10b is inserted inside the receiver portion 8b, returning to the state shown in FIG. 2.

In this state, the return torque of the mainspring 6 overcomes the frictional force of the spring 9, the claw 8 remains retracted, and the entire rope is reversed, and the rope 4 is wound onto the reel 5.

As explained in detail above, according to the present invention, while the engine is running, one end of the friction arm is pushing the catch from the inside, so the pawl will not pop out due to vibration. In the retracted state, the claw provided on the reel and the side wall are formed in a continuous circular shape, and the restraining plate is configured to cover the outer diameter of the reel, so there is no gap to the inside, and therefore the dustproof effect is large and the operation is reliable. be.

In addition, by separating the friction arm and the coil spring as in the present invention, the dimensional accuracy of the coil spring can be improved, the spring constant can be lowered, and the stability can be improved, compared to the previous proposal of the applicant in which the arm is integrally provided at the tip of the coil spring. Therefore, the frictional force itself can be lowered, and the spring return torque can be small, and there is no deterioration due to the spring arm, and the shape of the friction arm can be freely selected from resin, etc., and the claw The timing of entry and exit can be freely obtained, and in addition, the structure is simple, so manufacturing and assembly are easy, and manufacturing is possible at low cost.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional side view showing one embodiment of the recoil starter of the present invention, and FIGS. 2, 3, 4, and 5 are diagrams illustrating its operation. 1...Pulley, 2...Case, 3.
...Shaft, 4...Rope, 5...
...Reel, 5a...Side wall, 5a', 5a''
...End, 5b...Stopper, 6.
...Spring, 7...Claw shaft, butt...
・Claw, 8a... Engaging part, 8b... Receiving part, 9... Coil spring, 10...
-Friction arm, 10a, 10b... end, 12... holding plate.

Claims (1)

[Scope of utility model registration request] In coil starters, which use the restoring force of a mainspring to wind a rope onto a reel, the shaft protruding into the case is rotatably attached to the reel.
A coil spring is inserted into the shaft, and a friction arm and a restraining plate are provided in this order at the end of the coil spring, and the coil spring is compressed against the shaft by the restraining plate via the friction arm, and the frictional contact prevents the friction arm from rotating. In addition, between the reel and the holding plate, there is an arc-shaped pawl with one side serving as an engaging part and the other as a receiving part, and the pawl is supported approximately in the center by a pawl shaft provided on the reel side. When the reel is retracted, the ends of the engaging part and the receiver are formed in a circular shape with the ends connected to both ends of the arc-shaped side wall provided on the reel, and the holding plate covers the circumference formed by the claw part and the side wall. On the other hand, when the friction arm rotates in the operating direction of the reel, one end of the friction arm engages with the inside of the engaging portion of the pawl to push the tip of the pawl outward, and when the friction arm rotates in the return direction, the other end engages with the inside of the engaging portion of the pawl. The receiver engages with the inner side of the part to rotate the retaining part of the pawl inward, and after the pawl rotates, the friction arm remains engaged and rotates with the reel.