JPH0244029Y2 - - Google Patents

Description

[Detailed description of the invention] "Field of industrial application" This invention relates to a carburetor that controls the amount and concentration of air-fuel mixture supplied to an engine, and in particular, a thrust stopper for a throttle shaft that supports a butterfly valve that opens and closes an intake duct. It is related to equipment.

``Prior Art'' Conventionally, a thrust stop device for a throttle shaft of a carburetor that is commonly used is explained. Throttle bearing bosses are provided on both sides of the intake passage that passes through the carburetor body at right angles to the intake passage. A throttle bearing hole is drilled through the throttle bearing boss and the intake passage. A throttle shaft is rotatably disposed within the throttle bearing hole, and a butterfly valve capable of opening and closing the intake passage is attached to the throttle shaft within the intake passage.

Also, a throttle return spring is arranged between the end face of the throttle bearing boss on one side and the throttle valve lever, which biases the intake passage in the closing direction with respect to the throttle shaft and biases the throttle shaft laterally. . Furthermore, a flat round washer is disposed between the end face of the throttle bearing boss on the other side and a pin disposed through the end of the throttle shaft that protrudes from the end face of the throttle bearing boss.

Furthermore, a butterfly valve is attached to the throttle shaft located in the intake passage, and by rotating the throttle lever, the throttle valve controls opening and closing of the intake passage.

``Problems to be solved by the invention'' According to the conventional thrust stopper device for the throttle shaft of a carburetor, when the throttle valve lever is rotated,
The pin presses the flat round washer with a throttle return spring, and the pin rotates on the surface of the flat round washer while the flat washer is stopped on the end face of the throttle bearing boss.

This rotation causes a concentrated load because the contact area of the pin is small, and since the rotation angle is within a certain range, uneven wear of the washer occurs, which is not desirable in terms of durability.

``Means for Solving Problems''``Operations'' In view of these conventional problems, the thrust stopper for the throttle shaft of a carburetor according to the present invention has a plurality of pins locked on one side of the pin side of the flat round washer. A protrusion is provided, and the pin is engaged between the pin locking protrusions, so that when the throttle shaft rotates, the pin is engaged between the pin locking protrusions of the flat round washer. The flat round washer can be rotated synchronously with the pin and throttle shaft.

``Embodiment'' Hereinafter, an embodiment of a thrust stopper for a throttle shaft of a carburetor according to the present invention will be described with reference to the drawings.

1 is a carburetor body through which an intake passage 2 passes, and a throttle bearing boss 3 is provided on the side of the carburetor body.
is placed. A throttle bearing hole 4 is bored through each throttle bearing boss 3 and the intake passage 2, and a throttle shaft 5 is rotatably supported in the throttle bearing hole 4. A throttle lever 6 is fixed to one end of the throttle shaft 5 (for example, the left side in FIG. 1), and between the throttle lever 6 and the end surface 3A of the throttle bearing boss 3, there is a A throttle return spring 7 that applies a biasing force in the closing direction and presses the throttle shaft 5 leftward in FIG. 1 is arranged in a compressed manner.

Further, a pin 8 is disposed at the other end of the throttle shaft 5 (for example, on the right side in FIG. 1) passing through the throttle shaft 5, and a flat round washer 9 is disposed between the pin 8 and the end surface 3B of the throttle bearing boss 3. Placed.

A plurality of pin locking protrusions 9A are protruded from one surface of the flat round washer 9 on the pin 8 side, and the protrusion height of the pin locking protrusions 9A is larger than the amount of movement of the throttle shaft 5 in the thrust direction. Further, it is preferable that the width between each pin locking protrusion 9A, 9A is somewhat larger than the diameter of the pin 8 so that the pin 8 can fit into the valley.

Incidentally, reference numeral 10 denotes a throttle valve that is attached to the throttle shaft 5 and opens and closes the intake passage 2.

According to the throttle shaft thrust stop device of the present invention having such a structure, the throttle shaft 5
The pin 8 attached to the throttle return spring 4 is pressed against the surface of the flat washer 9 by the thrust force of the throttle return spring 4. At this time, the pin 8 is placed between the pin locking protrusions 9A and 9A. Ru.

Therefore, when the throttle shaft 5 rotates, this rotational force is transmitted to the pin locking protrusions 9A, 9A of the flat round washer 9 through the pin 8, so the throttle shaft 5 and the flat round washer 9 rotate synchronously. It is something that moves.

According to this, the thrust force of the pin 8 in the thrust direction is distributed over the entire lower surface of the flat round washer 9, and since this thrust force does not concentrate on one part, there is no wear when the throttle shaft 5 is operated. It is possible to obtain stable operating performance of the throttle shaft over a long period of time without any occurrence of this problem.

In addition, the thrust amount of the throttle shaft 5 is made larger than the pin locking protrusion 9A of the flat round washer 9, so when the throttle shaft 5 rotates, the pin 8 rides on the pin locking protrusion 9A, preventing malfunction of the throttle shaft. I have nothing to give.

"Effects of the Invention" As described above, according to the thrust stopper device for the throttle shaft of a carburetor according to the present invention, a plurality of pin locking protrusions are provided on one side of the flat round washer on the pin side.
Since the pin is arranged to engage between the pin locking protrusions, the pin and the flat round washer rotate synchronously when the throttle shaft rotates, and the contact of the flat round washer with the end face of the throttle bearing boss is made uniform. This prevents wear of the flat round washers and pins, resulting in stable throttle shaft operating performance over a long period of time.

[Brief explanation of the drawing]

The figures show an embodiment of the thrust stop device for the throttle shaft of a carburetor according to the present invention. FIG. 3...Bearing boss, 5...Throttle shaft, 8...
Pin, 9... Flat round washer, 9A... Pin locking protrusion.

Claims (1)

[Claims for Utility Model Registration] 1. Throttle bearing holes 4, 4 are bored in the intake passage 2 passing through the carburetor body 1, and a throttle shaft 5 is rotatably supported in the throttle bearing hole. The throttle shaft 5 is attached to one end of the throttle shaft.
A throttle return spring 7 that applies rotational force in the closing direction and thrust force to the side is compressed, and a pin 8 penetrating through the other end of the throttle shaft 5 and a throttle bearing boss 3 are connected to each other. In a thrust stop device for a throttle shaft of a carburetor in which a flat round washer 9 is disposed between the flat round washer 9 and the pin 8, a plurality of pin locking protrusions 9A, 9A are provided on one side of the flat round washer 9 on the pin side. A thrust stopper device for a throttle shaft of a carburetor, which is configured to be engaged between pin locking protrusions 9A, 9A. 2. A thrust stopper for a throttle shaft of a carburetor according to claim 1, wherein the height of the pin locking projection 9A of the flat round washer is larger than the thrust amount of the throttle shaft 5.