JPH0545807Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention simplifies the assembly of a fuel vibration suppression plate for suppressing the vibration of fuel in the float chamber formed in contact with the lower surface of the carburetor housing. The present invention relates to a carburetor that is easy to assemble and also has a valve seat body that is easy to assemble.

[Prior art] Figure 4 is a side view of a carburetor with the float chamber body removed;
FIG. 5 is a sectional view taken in the direction of the - arrow in FIG. 4, and shows one conventional example in which a fuel vibration suppression plate for suppressing the vibration of fuel in the float chamber is attached to the carburetor casing. Reference numeral 1 is a carburetor housing, 2 is a fuel swing suppression plate, 3 is a valve seat body that performs valve action in cooperation with the float valve 4, 5 is a boss to which the valve seat body 3 is attached, and the valve seat body 3 is attached to the boss 5. When assembled by screwing into the fuel introduction opening formed in the valve seat body 3 and the boss 5, the fuel swing suppression plate 2 is clamped and fixed between the valve seat body 3 and the boss 5. Reference numeral 6 denotes a central hanging portion of the housing 1. A main fuel passage is formed in the center to lead the fuel in the float chamber to a main intake passage 7 shown by a broken line, and a main fuel jet 8 is attached to the lower end. 9 is a jet cover, which covers the main fuel jet 8 with the hanging part 6.
It is clamped and fixed between the lower end surface of the hanging portion 6 and the main fuel jet 8 when the lower end is screwed and assembled. Reference numeral 10 denotes a hanging portion of the housing 1 in which a low-speed fuel passage is formed in the center. The jet cover 9 cooperates with the fuel swing suppression plate 2 to prevent air from being drawn into the main fuel system from the main fuel jet 8 due to fuel swing. 11 is a float arm, and 12 is a bracket that hangs below the housing 1 and pivotally fixes the float arm 11. In FIG. 5, the float arm 11 is omitted to avoid complication of the drawing.

6, 7, and 8 show other conventional configurations in which the fuel swing suppression plate 2 is attached to the carburetor housing 1, with FIG. 6 being a side view, and FIGS. 7 and 8 being a side view, respectively. 6
FIG. Reference numerals in the figure indicate the same parts as those shown in FIGS. 4 and 5, and 13 is a retainer that presses and fixes the valve seat body 3 to the boss 5 via the fuel swing suppression plate 2. The plate is fastened to the boss 5 by a screw member 14.

Note that the float arm is omitted in FIGS. 7 and 8.

Although not related to the fuel swing suppression plate 2, FIG. 9 shows a valve seat body 3 and a bracket 12 for pivotally fixing the float arm 11, which are integrally constructed of synthetic resin, and are arranged between the housing 1 and the float chamber body 15. Special public service held in 1986-47300
FIG. 10 is a diagram showing the configuration disclosed in the No. 1, in which the fuel swing suppressing plate 2 and the jet cover 9 are integrally molded with synthetic resin, and the hanging portion 6 of the housing 1 and the low-speed fuel jet 16 are connected to each other.
JP-A-61-2003, which is engaged with a hanging portion 17 specially provided for fixing the fuel swing suppression plate 2, and is clamped and fixed by the housing 1 and the float chamber body 15.
FIG. 5 is a diagram showing the configuration disclosed in No. 58660.

[Problems to be Solved by the Present Invention] As shown in the figures from FIG. 4 to FIG.
The installation can be done by fixing the valve seat body 3 to the boss 5 by screwing it, or by attaching the holding plate 1 together with the valve seat body 3.
3 and the screw member 14, the assembly work is troublesome and takes a lot of man-hours. Therefore, as shown in Fig. 10,
Even if the mounting method of the fuel swing suppression plate 2 can be solved by the structure disclosed in No. 58660, the valve seat body 3 is screwed into the boss 5 of the housing 1 or fixed to the boss 5 by the screw member 14. Since it is not possible to sufficiently reduce the man-hours in this case, we combined the structure disclosed in Japanese Patent Publication No. 61-47300 (Fig. 9) in which the bracket 12 for pivotally fixing the float arm 11 and the valve seat body 3 are integrally molded. By integrally molding the fuel swing pivot plate 2 and the valve seat body 3, attachment to the housing 1 can be solved at the same time.

[Structure of the invention] A float chamber body is disposed in contact with the lower surface of the carburetor housing to form a float chamber that maintains a constant oil level, and a portion of the housing that hangs into the float chamber has an opening below the constant oil level. A fuel passage is formed which has a section and leads fuel to the main intake passage of the carburetor, and the constant oil level is disturbed by the swinging of the fuel in the float chamber, and the opening below the constant oil level is formed. In order to prevent exposure to the air, a fuel swing suppression plate is arranged surrounding the hanging portion,
In order to form the constant oil surface, the carburetor is provided with a float, a float valve that opens and closes in conjunction with the float via a float arm, and a valve seat body that forms a guide surface and a valve seat of the float valve. The fuel swing suppression plate is integrally molded with a bracket for pivotally fixing the float arm and the valve seat body using synthetic resin to form one molded body, and an O The molded body is positioned by elastically inserting the valve seat body with a ring interposed therebetween, and by sandwiching a protruding piece formed to protrude horizontally from the molded body between the housing and the float chamber body. configuration.

[Embodiment] FIG. 1 is a longitudinal cross-sectional view of an embodiment of the vaporizer of the present invention, with reference numerals 1 to 8, 10 to 12,
and 15 indicate the same parts as the reference numerals in FIGS. 4, 5, 9, and 10, 5a is a fuel introduction opening formed in the boss 5, and 9a is threadedly engaged with the hanging portion 6. This member serves to fasten the float chamber body 15 to the housing 1 and also functions as the jet cover 9 shown in FIG. 4. The fuel swing suppression plate 2 is formed in a cylindrical shape surrounding the hanging portions 6 and 10, and includes a bracket 1 for pivotally fixing the valve seat body 3 and the float arm 11.
2 and is integrally molded with synthetic resin such as Diuracon to form one molded body 18. A guide surface 3a for a float valve 4 and a valve seat 3b are formed on the valve seat body 3, and the valve seat body 3 is elastically inserted into a fuel introduction opening 5a formed in a boss 5 through an O-ring 19. . In FIG. 1, a boss 5 protrudes from the lower surface of the housing 1 to form a fuel introduction opening 5a, but the formation of the boss 5 is not an essential requirement, and a fuel introduction opening 5a is formed on the flat lower surface of the housing 1. formed,
The valve seat body 3 may be inserted with the intervention of the O-ring 19. FIG. 2 is a perspective view of the molded body 18, and as described above, 2 is a fuel swing suppression plate, 3 is a valve seat body, 12 is a bracket for pivoting the float arm 11, and 3C is an O This is a groove in which the ring 19 is attached. A horizontally protruding piece 20 is formed on the molded body 18 and is clamped and fixed between the housing 1 and the float chamber body 15. This state is shown in FIG. FIG. 3 is a cross-sectional view taken along the - arrow in FIG. 1. In FIG. 3, the same parts as the reference numerals in FIGS. It is elastically pressed against the lower surface of the housing 1 and positioned. The other components of the carburetor not mentioned in FIG. 1 are not directly related to the present invention, and therefore their explanations will be omitted. Further, in FIG. 1, the float is omitted to avoid cluttering the drawing.

[Effects of the invention] By integrally molding the fuel swing suppression plate 2 with the valve seat body 3 and the bracket 12 that pivotally fixes the float arm 11, (1) The hanging portions 6 and 10 of the housing can be fixed to the cylindrical fuel swing. Pass it through the motion prevention plate 2.

(2) Resiliently insert the valve seat body 3 into the fuel introduction opening 5a via the O-ring 19.

(3) Place the horizontally protruding piece 20 of the molded body 18 on the lower surface of the carburetor housing 1.

This can be done in one operation, which has the effect of reducing the number of man-hours and the number of parts.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of the carburetor of the present invention, and FIG. 2 is a perspective view of a molded body in which a fuel swing suppression plate, a valve seat body, and a bracket for pivotally fixing a float arm are integrally molded.
FIG. 3 is a cross-sectional view along the - arrow direction in FIG. 1, each of the figures from FIG. 4 to FIG. - A cross-sectional view in the direction of arrows, Figures 7 and 8 are views in the direction of the arrows in Figure 6, respectively, and Figure 9 is a sectional view of the valve seat body, which is integrally molded with the bracket for pivotally fixing the float arm. FIG. 10 is a diagram showing the structure disclosed in Japanese Utility Model Application No. 61-58660, in which the fuel swing suppression plate and the jet cover are integrally molded. Explanation of symbols, 1... Housing, 2... Fuel swing suppression plate, 3... Valve seat body, 3a... Guide surface, 3b... Valve seat, 3C... O-ring groove, 4... Float valve, 5...
Boss, 5a... Fuel introduction opening, 6, 10... Drooping portion, 7... Main intake passage, 8... Main fuel jet, 9a... Member that serves as attachment of the float chamber body and jet cover, 11... Float arm, 12...
Bracket, 15...Float chamber body, 18...Molded body, 19...O ring, 20...Protrusion piece, 21...
...Patsukin.

Claims (1)

[Scope of utility model registration request] A float chamber body 15 is disposed in contact with the lower surface of the carburetor housing 1 to form a float chamber that maintains a constant oil level. A fuel passage having an opening and guiding fuel to the main intake passage 7 of the carburetor is formed, and the constant oil level is disturbed by the swinging of the fuel in the float chamber, and the opening below the constant oil level is formed. A fuel swing suppression plate 2 is disposed surrounding the hanging parts 6 and 10 to prevent the parts from being exposed in the air. In the carburetor, the fuel swing suppression plate 2 pivots the float arm 11 in a carburetor equipped with a float valve 4 that opens and closes in conjunction with the float valve 4, and a valve seat body 3 that forms a guide surface 3a and a valve seat 3b of the float valve 4. Bracket 1 to stop
2 and the valve seat body 3 are integrally molded of synthetic resin to form one molded body 18, and the housing 1
into the fuel introduction opening 5a formed on the lower surface of the
The valve seat body 3 is elastically inserted with a ring 19 interposed therebetween, and a protruding piece 20 formed to protrude horizontally from the molded body 18 is sandwiched between the housing 1 and the float chamber body 15. Then, the molded body 18
A vaporizer characterized by positioning.