JPS6034760Y2 - Vaporizer choke valve mechanism - Google Patents

Description

[Detailed description of the invention] The present invention relates to a choke valve mechanism for a carburetor that easily and reliably maintains the choke valve mainly in the fully open position. The purpose is to provide a seed mechanism.

The choke valve of a general-purpose engine carburetor is generally operated manually, so in order to maintain its fully open position, conventionally the choke valve shown in Figure 1A was used.
As shown in Fig. 1, when the choke valve buoy is in the fully open position, a recess is provided on the outer periphery of the choke shaft opening, and a steel ball ho is provided corresponding to the recess on the bearing part of the choke shaft opening, which is pressed by a coil spring 2. A mechanism that maintains the fully open position by engagement between the ball hole and the recess;
Alternatively, as shown in Figure B, a coil spring post is placed facing the rotation path of the lever attached to the choke shaft opening, and the fully open position is achieved by engaging the spring post with a recess provided in the lever. A holding mechanism was commonly used.

However, the former requires a lot of assembly man-hours, and not only is it time-consuming and labor-intensive, but the variation in springs causes uneven operation, while the latter causes the spring to fall depending on how it is assembled, and it also causes wear on the operating part of the lever. There were drawbacks such as the occurrence of

In view of the above points, the present invention has been developed by providing a slot along the shaft insertion hole in the synthetic resin collar that is fitted into the part where the shaft of the choke valve passes through the bore wall and is to be bearing. A tongue-shaped portion is formed on a part of the periphery, and concave and convex portions are formed on the outside near the tip of the tongue-shaped portion and on the inner wall of the bearing portion, respectively, to engage with each other when the choke valve is at least in the fully open position. The above-mentioned drawbacks are eliminated with a simple configuration.

Embodiments of the present invention will now be described in detail with reference to the drawings.

Figure 2 is a vertical side view of the choke valve mechanism of the carburetor of the present invention, in which 1 is the bore of the carburetor, 2 is the choke valve, and 3 is the carburetor bore.
is a shaft portion of the choke valve 2, which is integrally formed with the lever portion 4 from a metal plate of a suitable thickness.

5 and 6 are the bearing parts of the shaft part 3, and 7.8 are the shaft parts 3.
This is a synthetic resin collar that is fitted onto the part where the bearing is mounted.

As described above, the present invention provides a tongue piece as shown in FIGS. 2 to 5 on a part of the periphery of the collar 7 made of synthetic resin, which is fitted into the portion where the shaft portion 3 is supported by the penetrating portion of the bore wall. A relatively deep split groove 11 is provided along the insertion hole 10 of the shaft portion 3 so that the shaped portion 9 is formed, and a convex portion 12 is formed on the outside near the tip of the tongue-shaped portion 9 formed by the split groove 11. On the other hand, the inner wall of the bearing portion 5 into which the collar 7 fits is provided with a recessed portion, for example, a vertical groove 13, which engages with the protrusion 12 when the choke valve 2 is in the fully open position.

In the above configuration, it is preferable that the groove width t of the groove 11 is slightly larger than the height h of the convex part 12, and that the convex part 12 has a spherical shape.

In the embodiment shown in the figure, the shaft portion 3 and the lever portion 4 are integrally formed of a metal plate, and the choke valve 2 is attached to the center of the shaft portion 3 with a screw 14. The portion 3 is not limited to a plate, and the concave and convex portions are also provided, although in the above embodiment the convex portion 12 is provided in the collar 7 and the concave portion 13 is provided in the shape of a groove in the bearing portion 5. It goes without saying that the recess 13 may be the opposite, and that the recess 13 is just a recess and does not have to be groove-like.

With this structure, when the choke valve 2 is fully opened, the convex portion 12 on the tongue-shaped portion 9 of the collar 7 engages with the recess, that is, the vertical groove 11 of the bearing portion 5, so that the choke valve 2 is fully opened. The position is securely held.

In this state, when the lever 4 is rotated in the fully open direction, the collar 7 is made of synthetic resin and has elasticity. By elastically falling inward as shown by the chain line in FIG. 4, the convex portion 12 escapes from the vertical groove 13 and rotates, and elastically maintains the fully closed position as shown by the chain line in FIG. .

As mentioned above, in this invention, the shaft part of the choke valve is a penetrating part of the bore wall, and a split groove is provided along the shaft part insertion hole in the synthetic resin collar that is fitted into the bearing part. , a tongue-shaped portion is formed in a part of the periphery, and concave and convex portions that engage with each other on the outside near the tip of the tongue-shaped portion and the inner wall of the bearing portion, respectively, when the choke valve is at least in the fully open position. Since the structure effectively utilizes the characteristics of synthetic resin, it is possible to secure the choke valve's fully open position with a simple structure that does not use springs, etc., and the operation is smooth and consistent. It has many excellent effects, such as being easy to process and assemble, having little wear, and helping to prevent foreign matter from entering the carburetor.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of the choke valve mechanism of a conventional carburetor.
Fig. 2 is a vertical side view showing an embodiment of the choke valve mechanism of the carburetor of the present invention, Fig. 3 is a sectional view taken along the line ■-■ in Fig. 2, Fig. 4 is a side view of the same collar, and Fig. 5. is a plan view of the same as above. 1...Bore of the carburetor, 2...Choke valve, 3...Shaft part, 5...Bearing part, 7...Color , 9... tongue piece-shaped part, 10... shaft part insertion hole, 11...
・Split groove, 12...Protrusion, 13...Vertical groove (recess).

Claims (1)

[Scope of utility model registration request] A collar molded from synthetic resin is fitted into the part where the shaft of the choke valve is supported by the penetrating part of the bore wall.
The collar is provided with a split groove along the shaft insertion hole so that a tongue-shaped part is formed in a part of the periphery, and the outside near the tip of the tongue-shaped part by this split groove is connected to the bearing. A choke valve mechanism for a carburetor, characterized in that the inner wall of the choke valve is provided with concave and convex portions that engage with each other at least in the fully open position of the choke valve.