JPS5843645Y2 - vaporizer - Google Patents

Description

[Detailed description of the invention] This invention relates to a carburetor that uses a special shaft in the shaft part of the choke valve, and is easy to manufacture and install.
The aim is to provide a vaporizer that is highly mass-producible and can reduce costs.

Conventionally, the shaft of a choke valve is generally a rod made of iron or brass, and both ends of this rod are machined or threaded, a notch or slotted groove is provided in the center for mounting the valve, and one end is made of iron. It was attached by caulking the lever or using a set screw.

Because of this configuration, processing and assembly are time-consuming.
The cost was high.

For this reason, there are models in which the shaft, lever, and valve are integrally molded from synthetic resin, but resin is not only inferior to metal in terms of strength and heat resistance, but also cannot be attached to the bore side of the carburetor. This method has some drawbacks, such as the need for some ingenuity.

In view of the above points, the present invention has been developed by molding the shaft portion and part of the lever of the choke valve from an integrated metal plate, and providing a cylindrical bearing member molded from synthetic resin or the like at the bearing portion of the shaft portion. The choke valve is fixed to the shaft part with screws, and a locking part is provided between the bore and the shaft part to hold the choke valve in the fully open and fully closed positions. The parts are integrally molded from a metal plate, so there is no need for caulking or screwing, and it is strong.

Proceeding to explain the embodiment of the present invention with reference to the drawings, the first
The figure is a vertical sectional view of a part of the bore showing the choke valve installed in the carburetor. In the figure, 1 is the bore of the carburetor, 2 is the choke valve, 3 is the shaft of the choke valve 2, and 4 is the valve 2. The screw is used to fix it to the shaft part 3. 5 is a lever part, and 6 is a knob part.

In the present invention, the shaft portion 3, lever portion 5, and knob portion 6 of the choke valve 2 of a carburetor as described above are integrally molded from metal plates, and the shaft portion 3 is supported by the peripheral wall of the bore 1. That is, cylindrical bearing members 9° and 10 formed of synthetic resin or the like are respectively fitted to the tip end 7 of the shaft portion 3 and the penetrating portion 8 of the bore peripheral wall, and the choke valve 2 is held in the fully open and fully closed positions. A locking portion is provided between the bore 1 and the shaft portion 3.

In the illustrated embodiment, the shaft portion 3 is provided with a long portion that is the backbone of a metal plate formed into a hook shape with an upwardly curved tip as shown by the chain line in FIG. 2 by punching or the like.
As shown in FIG. 3, the head part is bent at right angles to the plate surface to form a lever part 5, and the curved part at the tip is further bent upward parallel to the shaft part 3 to form a knob part 6. The tip part 7 of the shaft part 3 has a length equal to the height of the bearing member 9 and the width is appropriately narrowed, and the other penetrating part 8 has a part on both sides so as to be located approximately in the center of the bearing member 10. An engaging protrusion 11 is formed, and at least one screw hole 12 for mounting the valve 2 is provided at a suitable location on the shaft portion 3, but these can be formed during punching.

Further, cylindrical bearing members 9 and 1 fitted into the shaft portion 3
As shown in FIGS. 5 to 8, 0 is a square hole 1, which is equal to the cross-sectional shape of the shaft portion to be fitted, respectively.
' and an outer diameter approximately equal to the respective diameters of the bearing holes 13 and 14 in the bore circumferential wall, and only the member 10 has recesses 11 on both sides of the central part within the hole 8' to engage with the protrusion 11 of the shaft portion 3. It is provided.

When assembling the shaft portion 3 formed as described above, if the bearing member 10 is forcibly inserted into the penetrating portion 8 from the tip, the bearing member 10 is made of synthetic resin, so its elasticity will cause the protrusion to
1, and the protrusion 11 and the recess 11' engage with each other, whereby the member 10 is fixed to the through part 8 of the shaft part 3. In this state, the shaft part 3 is inserted into the bore 1 into the bearing hole. Insert through 14.

In this case, the member 9 (
d The shaft portion 3 may be fitted at a position where it is inserted halfway into the bore 1, or the member 9 may be inserted into the bearing hole 13 of the bore wall in advance, and the shaft portion 3 may be inserted into the bore 1. In this case, the tip of the shaft portion and the hole 7' may be aligned and press-fitted.

After the shaft part 3 has been inserted in this manner, the plate surface of the shaft part is directed toward the inlet of the pore 10, the valve 2 is applied, and the screw 4 is tightened to easily complete the assembly work.

Note that the bearing member 10 that fits into the penetration portion 8 may be formed integrally with the shaft portion 3 since it does not interfere with the insertion and removal of the shaft portion 3.

Next, the locking portion that holds the choke valve in the fully open and fully closed positions can be engaged with the shaft portion 3 either indirectly or directly.

In the case of the above-mentioned indirect engagement, as shown in FIG. It is sufficient to provide a locking groove 17 on the outer periphery of the valve 10' into which the ball 16 falls when the valve 2 is fully open and fully closed when the valve 2 is under pressure, and in the case of direct engagement, as shown in Fig. 10. , when punching the shaft part 30, the lever part 5' is formed into an S-shape that forms an arcuate surface concentric with the shaft part 3 on a part of its side surface, and on the other hand, the lever part 5' is formed into an S-shape that forms an arcuate surface concentric with the shaft part 3, and on the other hand, a part of the lever part 5' is formed into an S-shape that forms an arcuate surface concentric with the shaft part 3. A locking spring column 18 is installed, and a valve 2 is installed on the arc surface of the lever part 5'.
It is only necessary to provide a locking recess 19 that engages with the spring column 18 at the fully open position and the fully closed position, and the structure can be easily constructed even in the case of indirect or direct falling.

As mentioned above, the present invention involves molding the shaft part and a part of the lever of the choke valve of the carburetor with an integral metal plate, and providing a bearing member molded of synthetic resin or the like in the bearing part of the shaft part. Since the valve is fixed to the shaft part with screws, the shaft part and part of the lever can be integrally molded by simple means, so there is no need for caulking or screw fixing, and since the shaft part is a plate, air flow is improved. Not only does the projected area in the direction become smaller, reducing air resistance, but there is no need to cut out or slot grooves on the shaft to attach the valve, and the valve can be easily moved to the fully open or fully closed position using the locking part. In addition, since the bearing member is made of a molded material such as synthetic resin, it has excellent wear resistance, and the structure is extremely simple and suitable for mass production. It can be played.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing an embodiment of the carburetor of the present invention, Fig. 2 is a front view of the shaft portion of the same, Fig. 3 is a side view of the same, and Fig. 4 is a side view of the same.
The figure is a plan view of FIG. 2, FIG. 5 is a vertical sectional view of the bearing member at the tip of the shaft, FIG. 6 is a plan view of the same, FIG. The figure is a plan view of the same as above.
FIG. 9A is a sectional view showing the locking part in the fully open and fully closed positions of the valve, FIG. 9B is a plan view of the same bearing member, FIG. 10A is a side view showing the other side of the same, and FIG. 10B is It is a top view same as the above. 1... Bore of the carburetor, 2... Choke valve (throttle valve), 3... Shaft part, 4... Screw
5゜5'... Lever part, 7, 8... Bearing part, 9゜10, 10'... Bearing member, 15... Spring, 16... Locking ball, 17 ...locking groove, 1
8... Suffling pillar for locking, 19... Recessed portion for locking.

Claims (1)

[Claims for Utility Model Registration] ■ A part of the shaft part of the choke valve is formed of an integral metal plate, and the choke valve is fixed to the shaft part with screws, and the part of the shaft part that receives the bearings. A carburetor characterized in that the carburetor is provided with a cylindrical bearing member molded from synthetic resin or the like, and further provided with a locking portion for holding the choke valve in the fully open and fully closed positions. 2. The carburetor according to claim 1, wherein the locking portion is comprised of a recess on the outer peripheral surface of a bearing member molded from synthetic resin and a ball member that abuts the recess. 3. The carburetor according to claim 1, wherein the locking portion is constituted by a columnar spring member fixed on the bore and a recessed portion of a lever that comes into contact with the columnar spring member.