JPH0433405Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a carburetor insulator installed in the middle of an engine intake passage to regulate output.

(Prior Art) A conventional carburetor insulator of this type is shown in FIGS. 3 and 4. In both figures, a denotes an insulator, which is entirely made of rubber and has a short-axis cylindrical insulator body b with openings at both ends, and both ends of the body b form connecting parts c and d. .

A partition wall e is integrally formed inside the main body b, located approximately in the middle in the axial direction thereof. A circular throttle passage f is formed in the partition wall e so as to be offset by a predetermined dimension to one side with respect to the center of the main body b.

The insulator a configured in this manner has a connecting portion c at one end connected to the intake passage g of the engine, and a connecting portion d at the other end connected to the outlet of the carburetor h, so that fuel (gasoline) is supplied from the carburetor h.
A mixture of gas and air flows through the throttle passage f to the intake passage g, and the engine output reaches a predetermined value due to the flow resistance to the mixture determined by the opening area of the throttle passage f. It is regulated.

(Problem to be solved by the invention) The insulator of such a conventional carburetor is
Since the entire area including the throttle passage f is made of rubber, the peripheral edge of the throttle passage f swells due to corrosion by fuel, and the peripheral edge of the throttle passage f is deformed due to suction pressure, etc., resulting in the expansion of the throttle passage f. The opening area differs from the initial setting value.

For this reason, the performance of the insulator a deteriorated, setting of the carburetor h for regulating the output was difficult, and the machining accuracy of the throttle passage f was poor.

The present invention was developed in view of the above circumstances, and its purpose is to prevent the opening area of the throttle passage from changing due to moisture expansion, and to prevent the opening area of the throttle passage from changing due to suction pressure, etc. To provide a carburetor insulator which does not cause any change in the carburetor, allows easy setting of the carburetor, and improves machining accuracy of a throttle passage.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention fixes a non-swelling plate member inside a short-shaft cylindrical rubber insulator body with openings at both ends. ,
The plate member is characterized in that a throttle passage is formed in the plate member.

(Function) Since the throttle passage is formed in a non-swelling plate member, the opening area of the throttle passage does not change due to swelling, and the throttle passage does not deform due to suction pressure or the like. The opening area never changes.

(Example) Hereinafter, an example of the present invention will be described based on FIGS. 1 and 2. FIG. 1 is a longitudinal cross-sectional view of a carburetor insulator according to the present invention, and in the figure, reference numeral 1 denotes a short-axis cylindrical insulator body with open ends, which is made of rubber. Both ends of this insulator main body 1 form connection parts 2 and 3. A partition wall portion 4 is integrally formed inside the insulator main body 1 at a substantially intermediate portion in the axial direction thereof. A circular hole 5 is formed in this partition wall portion 4 . This hole 5 is located at a position offset from the center of the main body 1 by a predetermined dimension to one side. One end surface 4a of the partition wall 4 is an inclined surface inclined at a predetermined angle with respect to the axis of the main body 1, and the other end surface 4b of the partition wall 4 is a surface perpendicular to the axis of the main body 1. has been done.

A plate member 6 is provided around the periphery of the hole 5, and the plate member 6 has a throttle passage 7 formed of a circular hole.
is formed. The plate member 6 is formed by press-molding a non-swellable metal material such as stainless steel. As a means for attaching the plate member 6 to the peripheral edge of the partition wall 4 of the hole 5, the plate member 6 is inserted into the insulator body 1 when the insulator body 1 is molded.

In the insulator of the present invention configured as described above, the connecting portion 2 at one end is connected to the intake passage 8 of the engine.
and the connecting portion 3 at the other end is connected to the outlet of the carburetor 9, respectively.

Next, the operation will be explained.

The throttle passage 7 is formed in the metal plate member 6, which is a non-swelling plate member, so that the opening area of the throttle passage 7 does not change due to swelling, and does not change due to suction pressure or the like. The throttle passage 7 is deformed,
There is no change in the opening area.

Therefore, setting of the carburetor 9 becomes easy.

In addition, the throttle passage 7 is a plate member 6 which is a pressed product.
2, the processing accuracy of the throttle passage 7 is improved.

Note that the cross-sectional shape of the throttle passage 7 is not limited to the circular shape shown in the above-mentioned embodiment, but also has a slit shape, etc.
It can also be applied to various shapes.

(Effects of the Invention) As detailed above, in the carburetor insulator according to the present invention, the throttle passage is formed in a non-swellable plate member.

Therefore, the opening area of the throttle passage does not change due to swelling, and the opening area does not change due to deformation of the throttle passage due to suction pressure or the like. Therefore, setting of the carburetor is facilitated, and the machining accuracy of the throttle passage is improved.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a carburetor insulator showing an embodiment of the present invention, FIG. 2 is a view taken along the - line in FIG. 1, FIG. 3 is a longitudinal cross-sectional view of a conventional carburetor insulator, and FIG. The figure is a view taken along the line in FIG. 3. 1... Insulator main body, 6... Plate member, 7
...Aperture passage.

Claims (1)

[Scope of utility model registration request] 1. An insulator for a carburetor, characterized in that a non-swellable plate member is fixed inside a rubber insulator body in the shape of a short shaft cylinder with both end faces open, and a throttle passage is formed in the plate member.