JPS6246846Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a carburetor, and more particularly to a carburetor having a valve opening/closing device such as a throttle valve or a choke valve in the carburetor.

As is well known, the above-mentioned valve opening/closing device requires a return spring for opening the valve in the closing direction or the opening direction, and a stopper for regulating the fully closed or fully open position of the valve. As for the return spring, a holding means is required to properly exert its biasing force.

Conventionally, the return spring was held in place by installing a collar on the valve stem to prevent it from falling, but as an alternative, the spring wrapped around the valve stem could be held around the valve stem using a piece of claw. Some proposals have also been made to retain the information.

On the other hand, a stopper boss protruding from the carburetor body side has been conventionally used as a stopper for regulating the degree of opening in the opening or closing direction of the valve, but in the prior art, means for holding the return spring, The means for contacting the stopper boss were each separate members. That is, the side wall of the operating lever connected to the valve stem is used as a contact means protruding from the carburetor body side, while the means for holding the return spring wound around the valve stem is also wrapped around a collar or attached to the operating lever. The return spring is held by the claws of other related levers.

Therefore, the number of parts and the number of assembly steps are large, which are obstacles to achieving further cost reduction and miniaturization.

The present invention was developed in view of the above-mentioned problems, and is a carburetor that has a valve stem for opening and closing the valve, an operating lever fixed to the tip of the valve stem, and a return spring wound around the valve stem. In a device in which the operating lever is engaged with a stopper boss that can protrude from the side of the carburetor body, a plurality of bent pieces are attached to the base end of the operating lever itself in parallel with the valve shaft on the side of the carburetor body. The return spring is held by surrounding the return spring with the folded piece, and the stopper boss, which is protruded from the carburetor main body side, is attached to the stopper boss formed on the bent piece where the hooking piece is formed. When the valve is fully closed, the latching piece of one bent piece and the stopper boss come into contact with each other, and when the valve is fully opened, the latching piece of the other bent piece and the stopper boss come into contact with each other. This is a carburetor that is characterized by the following settings, and its purpose is to simply hold the return spring and the contact part means that corresponds to the stopper boss that regulates the fully open and fully closed opening of the valve. The purpose is to make this possible by one means, reduce the number of parts, reduce the number of assembly steps, and make it possible to achieve smaller size, more compactness, and lower costs.

Hereinafter, an embodiment of the present invention will be described, which has a negative pressure sliding throttle valve that variably controls the area of the bench lily according to the air flow rate flowing through the intake tract, and a throttle provided in a negative pressure chamber to control the operation of the negative pressure sliding throttle valve. A variable bench lily type carburetor controlled by a valve lever is shown.

Figures 1 to 3 show this variable bench lily type carburetor, and in the figure, 1 is a carburetor body with an intake passage 2 passing through it, and a guide tube 3 is formed on the upper side of the intake passage 2. A negative pressure sliding throttle valve 4 is slidably disposed within the guide cylinder 3. A jet needle 5 is supported at the bottom of the negative pressure sliding throttle valve 4, and the jet needle 5 is inserted into a needle jet 6 to form a fuel discharge gap. On the other hand, a diaphragm 7 is attached to the upper part of the negative pressure sliding throttle valve 4, and a negative pressure chamber 8 and an atmospheric chamber 9 are separately formed above and below this diaphragm 7. The negative pressure inside is introduced through the negative pressure introduction path 10, and the atmospheric chamber 9
Atmosphere is introduced through an air introduction path 11. And the above negative pressure sliding throttle valve 4
A throttle valve lever 13 for pushing down or releasing the top 12 of the valve shaft 1 is installed in the negative pressure chamber 8.
4, the valve shaft 14 has an end projecting outward from the carburetor main body 1, an operating lever 15 is attached to the projecting end, and a coil-shaped valve fitted to the projecting part of the valve shaft 14 A return spring 16 urges the throttle valve lever 13 in the closing direction via the operating lever 15 and the valve shaft 14.

In the above variable bench lily type carburetor, when the engine rotates and the negative pressure generated in the intake passage 2 is guided to the negative pressure chamber 8 through the negative pressure introduction path 10, the negative pressure chamber 8 and the atmospheric chamber 9
A pressure difference is generated, and the negative pressure sliding throttle valve 4 gradually moves upward. This upward movement continues until the downward force and the upward force due to the negative pressure in the negative pressure chamber 8 are balanced. stops at the position. If the throttle valve lever 13 is further opened from this arbitrary state by rotating the operating lever 15, the negative pressure sliding throttle valve 4
further rises, the area of the bench lily and the fuel discharge gap increase, and acceleration can be achieved. Conversely, from any of the above states, the throttle valve lever 13 is moved back to the return spring 1.
When the negative pressure sliding throttle valve 4 is closed by the biasing force 6, the negative pressure sliding throttle valve 4 is forcibly lowered to achieve deceleration.

Now, in the variable bench lily type carburetor as described above, the present invention is characterized by the following structure. That is, as shown in FIGS. 4 to 6,
At the base end of the operating lever 15, there are a plurality of bent pieces 17a, 17b, 17c (the figure shows a case of three pieces).
are provided protruding toward the carburetor main body 1 side, and the return spring 16 is surrounded and held over almost the entire length by the bent pieces 17a, 17b, and 17c. And the plurality of bent pieces 17a, 17b,
The tips of the two bent pieces 17a and 17b of the 17c are bent outward at right angles and attached to the hooking pieces 18a and 18.
b, and the hooking pieces 18a,
A stopper boss 1 protruding from the carburetor main body 1 is provided between the bent pieces 17a and 17b forming the curve 18b.
9 so that when the operating lever 15 rotates, the locking pieces 18a, 18b and the stopper boss 19 can come into contact and lock. And two bent pieces 17 forming the above-mentioned hanging pieces 18a and 18b.
The positional relationship between a, 17b and the stopper boss 19 is set as follows. That is, when the throttle valve lever 13 is closed by the biasing force of the return spring 16 and the negative pressure sliding throttle valve 4 is fully closed (FIG. 5), the locking piece 18a of the bent piece 17a is closed.
While the stopper boss 19 contacts and latches, the operating lever 15 is rotated by the rotational force applied from the accelerator mechanism (not shown), and the throttle valve lever 1 is rotated.
3 is opened and the negative pressure sliding throttle valve 4 is fully opened (FIG. 6), the locking piece 18b of the bent piece 17b and the stopper boss 19 are set to come into contact and lock. It has been done.

According to the above structure, the return spring 16
Since it is surrounded and held by the bending pieces 17a, 17b, and 17c, there is no fear that the shape will collapse during operation, and the coiled shape can be maintained at all times. Therefore, the biasing force of the return spring 16 is also constantly applied to the negative pressure sliding throttle valve 4 side via the operation lever 15, so that the closing operation of the valve can always be performed reliably and smoothly. Furthermore, the full-close and full-open opening degrees of the negative pressure sliding throttle valve 4 are determined by the positional relationship between the bent pieces 17a, 17b and the stopper boss 19, and therefore can be set outside the carburetor main body 1. .

That is, the bent pieces 17a, 17b, and 17c, the hanging piece 18a on the bent piece 17a, and the hanging piece 18b on the bent piece 17b have the roles of holding the return spring and abutting against the stopper boss. This is what we are doing.

That is, the above two roles can be performed without using separate members. Therefore, the number of parts and assembly man-hours are small.

Although the above embodiment has been explained with respect to a variable bench lily type carburetor, the present invention can be similarly implemented in other types of carburetors having a return spring and an operating lever fixed to the valve shaft for opening and closing the valve. , it is possible.

As detailed above, the present invention includes a plurality of bent pieces protruding from the base end of the operating lever toward the carburetor body in parallel with the valve shaft, and the return spring is surrounded by the bent pieces. In addition, a stopper boss protruding from the carburetor body faces between two of the bent pieces on which the hook pieces are formed, and the valve is fully closed. These carburetors are characterized in that the latching piece of one bent piece and the stopper boss are in contact with each other at times, and the latching piece of the other bent piece and the stopper boss are in contact with each other when fully opened. Not only can the return spring be held by the bending piece and the locking piece provided on the operating lever, that is, by a single means, but also the function of the contact part that can come into contact with the stopper boss that regulates the valve opening degree. will have. Therefore, the number of parts and assembly man-hours are reduced, further reducing costs.
It becomes possible to make it smaller and more compact.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional front view showing an embodiment of the present invention, Fig. 2 is a side view, Fig. 3 is a plan view, Fig. 4 is a partially enlarged sectional view taken along the line - - in Fig. The figure is an explanatory view showing when the valve is fully closed in the embodiment of the present invention, and FIG. 6 is an explanatory view similarly showing when the valve is fully open. 1... Carburetor main body, 4... Negative pressure sliding throttle valve, 1
3... Throttle valve lever, 14... Valve stem, 15... Operation lever, 16... Return spring, 17
a, 17b, 17c...Bending piece, 19...Stopper boss, 21...Valve stem, 22...Operation lever,
23...Return spring.

Claims (1)

[Claims for Utility Model Registration] A carburetor having a valve shaft for opening and closing a valve of the carburetor body, an operating lever fixed to the tip of the valve shaft, and a return spring wound around the valve shaft, In a device in which the operating lever is engaged with a stopper boss that can protrude from the carburetor main body side; a plurality of bent pieces are protruded from the base end of the operating lever toward the carburetor main body side in parallel with the valve shaft; The return spring is held by surrounding the return spring with the bent piece, and a stopper boss protruding from the carburetor body is attached to two of the bent pieces on which the hooking piece is formed. When the valve is fully closed, the latching piece of one bent piece and the stopper boss are in contact with each other, and when the valve is fully open, the latching piece of the other bent piece and the stopper boss are in contact with each other. A vaporizer characterized by being set to.