Carburetor choke valve

Details Carburetor choke valve Carburetor choke valve

1998-09-24

2001-02-13

Chiesa, Richard L. (Department: 1724)

Gas and liquid contact apparatus

Fluid distribution

Valved

C261S046000, C261S055000, C261S063000

Reexamination Certificate

active

06186482

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the invention
The present invention relates to a choke valve provided with a carburetor, and particularly to a choke valve provided with a relief valve in the choke valve body of the carburetor.
2. Description of Related Art
A conventional example of such a choke valve provided with a relief valve is disclosed in Japanese Patent Laid-open No. Sho. 58-165555, and is shown in
FIG. 14
of the present invention.
A throttle valve
04
is arranged at a downstream side of a venturi section
03
in an intake passageway
02
of the carburetor body
01
. A choke valve
05
is arranged at the upstream side of the venturi section
03
.
The choke valve
05
is attached with screws to a choke shaft
06
that is rotatably constructed in the intake passageway
02
.
A relief window
05
a
is formed through the choke valve
05
. This relief window
05
a
opens and closes the relief valve
08
.
The relief valve
08
is formed as an elastic plate, and a base end part is attached to the choke valve
05
using screws
09
etc. The relief window
05
a
is closed when the relief valve is not subject to any external force.
In the relief valve
08
provided in the above described choke valve
05
, a base end part is attached to the choke valve
05
using screws
09
etc. which avoid the choke shaft
06
. Therefore, the screws
07
for attaching the choke valve
05
to the choke shaft
06
are necessary, as well as a separate attachment member such as screws
09
for attaching the relief valve
08
to the choke valve
05
. Therefore, there are a large number of manufacturing steps and the number of components is increased. Accordingly, the manufacturing cost is increased.
In addition, because of the large number of components, the overall weight of the choke valve
04
having a relief valve attached thereto is heavy.
If the choke valve
04
is heavy, it can not operate smoothly. As a result, the choke valve
04
crashes into a seat surface when it is completely closed, leading to abrasion of the seat surface.
Furthermore, because the base end side of the relief valve
08
is attached to the choke valve
05
using screws
09
etc. such that the choke shaft
06
is avoided, the relief window
05
a
can not be located close to the choke shaft
06
which is the rotational axis of the choke valve
05
. Therefore, the relief passageway can not be kept wide.
SUMMARY OF THE INVENTION
In view of the above described problems, the object of the present invention is to provide a choke valve with an excellent relief function, without the necessity of a relief valve. Therefore, the choke valve has a reduced number of components, is easy to assemble, and is light in weight.
In order to achieve the above objects, the present invention provides a carburetor choke valve provided in an intake passageway of a carburetor, comprising a plate shaped choke valve body having a relief opening. A base end side of a plate shaped relief valve for opening and closing the relief opening, is jointly fastened to a rotatably supported choke shaft crossing the intake passage of the carburetor.
The choke valve body and the relief valve are fastened together to the choke shaft. Therefore, the number of components is reduced, the number of assembly steps is reduced and manufacture is simplified.
Other than the screws needed to fasten the elements together, there is no need for an attachment member etc. Therefore, the choke shaft can be made lightweight in structure, the smooth operation of the choke valve can be accomplished, oscillation inertia can be reduced and abrasion of the seat surface when the valve is completely open can be restricted.
In addition, the base end side of the relief valve is attached to the choke shaft together with the choke valve body. Therefore, the relief opening can be made close to the choke shaft which is the rotational axis of the choke valve. As a result the relief passageway can be made wide and the relief function can be improved.
According to the present invention, the relief valve comprises a free end side valve body hinged to a base end side plate section together with a hinge structure energized in one rotational direction by a relief spring. The relief valve is jointly fastened to the choke shaft by pinching the choke valve body with the base edge sideplate section of the relief valve.
The relief valve itself has a hinge structure, and is attached to the choke shaft by the base end sideplate section pinching the choke valve body. Therefore, the number of assembly steps is reduced and manufacture is simplified.
According to another aspect of the present invention, both ends of the relief spring are extended along by a torsion coil spring.
When there is vibration of the free end side valve body relative to the base end sideplate section of the relief valve, the two ends of the relief spring respectively extend along the base end sideplate section of the relief valve and the surface of the free end side valve body. Therefore, the contact area is not impaired, giving abrasion protection.
According to a further aspect of the present invention, the relief valve is an elastic plate member which is fastened together with the choke shaft by pinching the choke valve body with an end section of a base end of the relief valve.
Because the relief valve is composed of only an elastic plate member and is attached to the choke shaft together with the choke valve body, the number of components and the number of assembly steps are reduced, and assembly is simplified. In addition, the choke valve body is made lighter in weight and has an extremely smooth operation, and abrasion resistance of a seat surface is improved.
According to a further aspect of the present invention, a carburetor choke valve is provided in an intake passage of a carburetor. The choke valve has a relief valve for opening and closing relief openings that have been formed in the choke valve body. The relief valve includes a free end side valve body hinged to a base end sideplate section together with a hinge structure energized in one rotational direction by a relief spring. Furthermore, the base end sideplate section of the relief valve is attached to the choke valve or a choke shaft.
By forming the hinge structure of the relief valve in advance, the number of assembly steps for the choke valve is decreased, and assembly can be simplified.
Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However,it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.


REFERENCES:
patent: 1894354 (1933-01-01), Kommer et al.
patent: 2062260 (1936-11-01), Weber
patent: 2108296 (1938-02-01), Roualet
patent: 2263027 (1941-11-01), Beard
patent: 2421733 (1947-06-01), Henning
patent: 2457570 (1948-12-01), Leibing
patent: 2571181 (1951-10-01), Ball
patent: 4770823 (1988-09-01), Sejimo
patent: 5688443 (1997-11-01), Swanson
patent: 58-165555 (1983-09-01), None

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