JPS6334298B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a breakage prevention device for a spring for a carburetor, and is particularly suitable for preventing breakage of a coiled spring. This invention relates to a breakage prevention device made of an elastic body.

As is known from Japanese Patent Publication No. 46-6653, various springs are used in carburetors depending on their purpose. By the way, a coiled spring is used as the throttle return spring, but this spring may resonate due to engine vibration, producing resonance noise, or the spring hanging part of the throttle return spring may become abnormal due to resonance. It may wear out, or in the worst case, the throttle return spring may break. If this phenomenon suddenly occurs while driving a car, the car will run out of control even if the user takes their foot off the access pedal, which is extremely dangerous.

Therefore, in order to prevent the above-mentioned resonance from occurring, conventional methods have been considered in which the outside or inside of the coiled spring is covered with an elastic body. 1st
The figure is an external view of the vaporizer. 1 is the carburetor body, 2
is the throttle lever, 3 is the spring hanger,
4 is spring hanger 3 and throttle lever 2
It is a coiled spring hung between the When driving a car, the throttle lever 2 rotates counterclockwise to control the driving state. At this time, the coiled spring 4, which is a throttle return spring, expands and contracts in proportion to the movement of the throttle lever 2. By the way, since the coiled spring 4 resonates with engine vibrations, in order to prevent this, conventionally a cylindrical rubber 5 has been installed inside the coiled spring 4, as shown in FIG.
Alternatively, as shown in FIG. 3, the outside of the coiled spring 4 is covered with a cylindrical rubber 6. However, in the case of FIG. 2, as the spring 4 expands and contracts, the cylindrical rubber 5 moves in the longitudinal direction of the spring 4, and the cylindrical rubber 5 may come off from inside the spring 4. Also, the third
In the case of the figure, the outer diameter of the spring 4 and the cylindrical rubber 6
If there is a gap between the inner diameter of the spring 4 and the inner diameter of the spring 4, the anti-resonance effect will be low, and if they are too close together, the cylindrical rubber 6 will get wedged inside the spring 4, restricting the expansion and contraction of the spring 4, and in the worst case, locking the spring 4. It reaches the end. Therefore, there are many problems in terms of stability, and it can be said that the one shown in FIG. 2 is preferable.

Furthermore, in Japanese Utility Model Application Publication No. 55-43109, an elongated ear is formed at one end of an elastic body provided on the inside or outside of a coiled spring, a notch is provided in this ear, and a coiled spring is inserted into the notch. It is described that the hook part at the tip of the elastic body is hooked to prevent the elastic body from coming off. However, in this conventional example, the ears are thinner and have notches, so the strength of this part is weak, and during installation work, it is difficult to pull the ears or pull the notches against the hook. If you pull the elastic body while it is hanging, there is a risk that the base of the ear part will tear or the notch will tear, and the retaining effect will be lost. Furthermore, even if this type of damage does not occur, the expansion and contraction of the coiled spring applies a force that rotates the elastic body in one direction, and as a result, the contact area between the notch and the spring gradually moves. In the end, the elastic body may shift toward the end of the coiled spring, and the resonance prevention effect may be lost.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the drawbacks of the prior art described above, and to provide a breakage prevention device for a spring for a carburetor that has a remarkable anti-resonance effect and is free from the risk of the elastic body coming off the coiled spring.

The above purpose is to provide an annular constriction near one end of a cylindrical elastic body, and adjust the winding diameter of the coil spring at the part corresponding to the constriction to match the outer diameter of the annular constriction. This is achieved by forming the coil spring to have a smaller diameter than that of the coil spring, and thus winding the small diameter portion of the coiled spring around the annular constriction.

In the present invention configured in this way, the annular constriction of the elastic body is firmly locked to the small diameter portion of the coiled spring. Since the constriction is formed into an annular shape, it is strong against tensile force and shearing force, and will not tear or tear. In addition, even when a force is applied to the elastic body to rotate in one direction by expanding and contracting the coiled spring, it is held firmly by the small diameter part of the spring wrapped around this constriction and moves in the axial direction. do not.
As a result, once the elastic body is set inside the coiled spring, it will not come off or move. Therefore, a stable resonance prevention effect can be expected.

The present invention will be explained in detail below using the embodiments shown in FIGS. 4 to 7.

FIG. 4 is a plan view showing an embodiment of the apparatus of the present invention.

In FIG. 4, 4 is a coiled spring for a carburetor, and the coiled spring 4 has one end 4.
The inner diameter of the coil a is smaller than that of the other parts. Reference numeral 7 denotes a cylindrical elastic body made of a rubber-like elastic member such as rubber or synthetic resin, which is provided inside the coiled spring 4, and is provided to prevent the coiled spring 4 from resonance due to engine vibration and breakage. It is something. As shown in FIG. 5, the cylindrical elastic body 7 has a constricted portion 8 whose outer diameter at one end is reduced to be approximately equal to the inner diameter of the end 4a of the coiled spring 4. The outer diameter of the end portion outside the constriction portion 8 is increased again to form a collar portion 9.

According to the embodiment of the present invention described above, after the cylindrical elastic body 7 is inserted inside the coiled spring 4, the end of the coiled spring 4 with the smaller inner diameter is placed at the constriction 8 of the cylindrical elastic body 7. Since the collar portion 9 comes into contact with the end face of the coiled spring 4, the cylindrical elastic body 7 does not move due to the expansion and contraction of the coiled spring 4. Therefore, the cylindrical elastic body 7 It will not come off from inside the coiled spring 4. Therefore, resonance of the coiled spring 4 with respect to engine vibrations is always and stably prevented, and breakage can be prevented.

In addition, FIG. 6 is a sectional view of the collar of a cylindrical elastic body showing another embodiment of the present invention, and in FIG. 6,
A bag portion 9a is provided on the outer periphery of the collar portion 9 of the cylindrical elastic body 7 so that the end of the coiled spring 4 can be wrapped therein. In this way, the movement of the cylindrical elastic body 7 relative to the coiled spring 4 can be stopped more reliably.

FIG. 7 is a structural diagram of a cylindrical elastic body showing still another embodiment of the present invention, in which a is a plan view and b is a side view. In FIG. 7, a notch 10 is provided in the longitudinal direction of the cylindrical elastic body 7. As shown in FIG. With this structure, the cylindrical elastic body 7 can be easily inserted inside the coiled spring 4, and the assembly work efficiency can be improved. Other effects are the same as in FIG.

As explained above, according to the present invention, the cylindrical elastic body does not come off from inside the coiled spring, and the resonance of the coiled spring can be always stably prevented and breakage can be prevented. be.

[Brief explanation of the drawing]

Figure 1 is an external view of a carburetor, Figures 2 and 3 are external views of a conventional carburetor spring breakage prevention device, and Figure 4 is an embodiment of the carburetor spring breakage prevention device of the present invention. The plan view shown in Fig. 5 is the 4th
FIG. 6 is a partial sectional view of the cylindrical elastic body showing another embodiment of the present invention, and FIG. 7 is a plan view showing one embodiment of the cylindrical elastic body of the present invention. It is a structural diagram of the cylindrical elastic body shown. 4... Coiled spring, 4a... End, 7
... Cylindrical elastic body, 8 ... Narrow portion, 9 ... Flange portion, 9a ... Bag portion, 10 ... Notch.

Claims (1)

[Claims] 1. In a breakage prevention device for a carburetor spring in which a cylindrical elastic body is attached inside a coiled spring, an annular constriction is provided near one end of the cylindrical elastic body, and a part of the coiled spring corresponding to the constriction is The winding diameter of the spring is formed to be smaller than the winding diameter of other parts in accordance with the outer diameter of the annular constriction, and the small diameter part of the coiled spring is wound around the annular constriction. Breakage prevention device for carburetor springs.