JPS6019968Y2 - Sliding throttle valve type carburetor - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a sliding throttle valve type carburetor with an improved throttle valve and a washer for the throttle valve return spring.

The purpose of this invention is to assemble the throttle valve operating cable to the carburetor.
It is an object of the present invention to provide a sliding throttle valve type carburetor which allows a removal operation in any case without disassembling the carburetor.

A general example of a throttle valve return spring portion of a conventional sliding throttle valve type carburetor is shown in a sectional view in FIG.

The throttle valve 2, which slides up and down in the mixture chamber 3 of the carburetor body 1, is constantly pressed by a throttle return spring 4 to close the intake cylinder.

The return spring 4 presses the throttle valve 2 and at the same time presses the fuel control valve 5.
The washer 7 that presses down the suspension washer 6 is pressed.

At one end of the intermediate solid portion 8 of the throttle valve 2, there is a through hole 10 through which the throttle valve operating cable 9 passes, and at the bottom thereof there is a through hole 10 through which the cable 9 for operating the throttle valve passes.
a counterbore 12 for locking the cable end 11 of the
The slot 13 through which the cable 9 is passed is inserted into the throttle valve 2 to securely engage the cable end 11 with the counterbore 12.
The above-mentioned through hole 10 and counterbore 12 are provided on the side surface.

A plan view of only the throttle valve 2 is shown in FIG.

That is, when assembling or removing the cable 9, remove the cap 14, pull out the throttle valve 2, and return the cable to the spring 4.
Pass the slot 13 through the inside, fit the cable end 11 into the counterbore 12, and then insert the throttle valve 2 into the mixture chamber 3.
The air-fuel mixture chamber top 15 is then tightened with the cap 14.

Connect cable 9 and cable end 11 to throttle valve 2 as described above.
In order to lock the cable end to the solid part 8 of the throttle valve, instead of providing a slot 13 in the throttle valve, a cable end hole is provided in the solid part as described in Japanese Utility Model Publication No. 43-29206, and the cable end is inserted through the hole. A device has been devised for installing a throttle valve in which the cable is held down by a throttle valve return spring, but even with this device, the operation of removing the throttle valve (disassembling the carburetor cap) is required when assembling the throttle valve with the cable. This is the same as the conventional vaporizer mentioned above.

The present invention allows the throttle valve operating cable to be assembled or removed without removing the throttle valve as described above, and an embodiment thereof is shown in FIGS. 3 and 4.

FIG. 3 is an enlarged cross-sectional view of only the throttle valve portion of the carburetor according to the present invention, and FIG. 4 is a plan view thereof.

The through hole 22 for locking the throttle valve operating cable provided in the solid part 21 of the throttle valve 20 has a round hole 23 (Fig. 4) through which the cable end passes and a slot 24 through which the cable passes.
The slot 24 has a structure in which a counterbore 25 (shown by dotted lines in FIG. 4) for locking the cable end is formed in the lower part of the slot 24, and the slot 13 at one end of the throttle valve is unnecessary.

The washer 26, which is pressed by the throttle valve return spring 4 and presses the needle valve washer 6, has a spring presser bent portion 2 that protrudes upward as shown in the figure.
7 and a downwardly protruding positioning engagement piece 28 are bent and formed, and on the opposite side of the bent portion 27 (a position symmetrical to the center point of the washer 26) there is a notch opening for avoiding the cable passage hole 22 and opening it. It has a shape that forms a portion 29.

An engaging portion 30 such as a slot or a recess is provided in the solid portion 21 of the throttle valve 20 so that the positioning engaging piece 28 of the washer 26 engages with the solid portion 21 of the throttle valve 20.

Since the carburetor according to the present invention is constructed as described above, the washer 26 is attached to the solid part 2 of the throttle valve 2, as shown in FIG.
If the positioning engagement piece 28 is inserted and placed on the engagement part 30 on the upper surface of the throttle valve solid part 21 and pressed by the throttle valve return spring 4, the cable passage hole 22 of the throttle valve solid part 21 will not be obstructed by the washer 26. The throttle valve return spring 4
The outer surface of one end of the lower end of the spring is in contact with the inner surface of the bent portion 27 of the spring retainer of the washer 26, and the outer surface of the other end of the spring is pressed against the inner surface of the throttle valve upper recess 16 on the cable passage hole 22 side. become.

Therefore, the cable passage hole 22 will not be blocked by the throttle valve return spring 4.

Therefore, while the cap 14 is tightened and installed on the engine, the cable 9 is inserted through the attachment hole of the cable adjustment screw 17 in the mixture chamber top 15, and the cable 9 is inserted into the solid part 2 of the throttle valve 20.
A round hole 23 provided in 1 and opened in the opening 29 of the washer 26
The cable end 11 can be easily passed through the cable end 11, and the cable 9 can be slid to fit and lock the cable end 11 into the counterbore 25 of the cable passage hole 22.

In addition, the cable assembled in the opposite direction is connected to the cap 14 of the vaporizer.
It is also easy to pull it out without removing it.

As described above, if the carburetor has the structure of the throttle valve and its pressing spring washer according to the present invention, it is possible to attach and remove the throttle valve operating cable 9 without disassembling the carburetor. Also, during use of the engine, the washer will never block the cable passage of the throttle valve due to vibration, or the throttle valve return spring will never block the cable passage, and the above cable can be attached and removed at any time. It is used as a vessel.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing the conventional general structure of the throttle valve part of a sliding throttle valve type carburetor, Fig. 2 is a plan view of only the throttle valve shown in Fig. 1, and Fig. 3 is a diagram according to the present invention. FIG. 4 is an enlarged sectional view of only the throttle valve portion of one embodiment of the carburetor, and FIG. 4 is a plan view thereof. 4... Throttle valve return spring, 9... Throttle valve operating cable, 11... Cable end, 16...
... Throttle valve upper recess, 20 ... Throttle valve, 21
......Solid part, 22...Cable passage hole, 23...Round hole, 24...Slot hole, 2
5... Counterbore, 26... Washer, 27.
... Spring presser bent portion, 28 ... Positioning engagement piece, 29 ... Cut opening portion, 30 ...
...Engagement part.

Claims (1)

[Scope of utility model registration request] A round hole 23 through which the cable end 11 passes through one edge of the throttle valve solid part 21 and a slot 24 connected to the round hole are connected to the lower part of the round hole 23 and engaged with the cable end 11 at the other end of the round hole 23. A throttle valve 20 including a cable passage hole 22 of a throttle valve operating cable 9 having a counterbore 25 and an engaging portion 30 of a presser washer 26 of a fuel adjustment needle valve, and positioning to engage with the engaging portion 30. A spring presser bent portion 2 that brings the engagement piece 28 into contact with a part of the outer surface of the throttle valve return spring 4 and presses the throttle valve return spring 4 against the inner surface of the throttle valve upper recess 16 outside the cable passage hole 22.
7 and a washer 26 which forms a notched opening portion 29 for opening the cable passage hole 22 on the opposite side of the bent portion 27 to the center point of the washer 26 and is pressed by the throttle valve return spring 4. Sliding throttle valve type carburetor.