JPH0427381B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a carburetor in which a starter fuel emulsion structure, a float column, etc. are integrally formed.

[Description of prior art]

Conventionally, as a structure for swingably attaching a float to a carburetor body, a pair of holes for holding a float pin are provided in the carburetor body, as shown in Japanese Patent Application Laid-open No. 119150/1983. A float pedestal was formed, a float pin was press-fitted or inserted into a hole in the float pedestal, and a float was attached to the float pin.

In addition, the carburetor body is formed with a starter well extending below the oil level of the float chamber at a position different from the float pillar, and a starter air introduction hole communicating with the middle of the well. The emulsion tube was press-fitted inside. The carburetor body further has a main well extending below the oil level of the float chamber at a location different from the float pillar and the starter fuel well, and a main nozzle is screwed into the main well. Ta.

[Problem that the invention seeks to solve]

Conventionally, in order to attach the float to the carburetor main body, it was necessary to fabricate a float pin attachment hole in the float pedestal and press fit the float pin into the hole. Furthermore, in the starter mechanism, it was necessary to press fit an emulsion tube into the starter well and to form a starter air introduction hole that communicated with the starter well. Furthermore, it was necessary to cut a thread in the main well to attach the main nozzle.

As described above, since floats, starter mechanisms, main nozzles, etc. have traditionally been individually attached to the carburetor body, there has been a problem in that processing and assembly operations have increased, increasing manufacturing costs.

[Purpose of the invention]

The present invention has been made in view of the above points, and includes a pillar and a starter fuel mechanism that are integrated into an integrated body separate from the carburetor main body, and the integrated structure is fitted into the carburetor main body and held by a spring. It is an object of the present invention to provide a carburetor which eliminates the machining work and assembly work conventionally performed on the carburetor body, reduces the number of parts, and significantly reduces manufacturing costs.

Another object of the present invention is to enable the main nozzle to be attached to the carburetor body by means of the starting system unit without performing any machining or assembly work on the carburetor body.

[Means for solving problems]

In order to achieve the above object, the present invention forms a starter fuel passage leading to a starter plunger in a carburetor body, and in a carburetor equipped with a float in a float chamber, a pair of spaced apart holes are formed for holding the float. a float pedestal, a first tube communicating with the starter fuel passage, a second tube having an air lead hole at one end and communicating with the first tube, the pedestal and the first tube. or a starting system unit integrally formed with a plate interposed between the second pipe body, and a float pin inserted into the hole of the float pillar is integrally formed on the float;
The starting system unit is provided with a starter jet that opens below the oil level in the float chamber and communicates with the first pipe body and the second pipe body, and is fitted with the tip of the first pipe body in the carburetor body. A fitting portion is formed, and means for pressing the starting system unit is provided in the float chamber in order to fit and hold the first tube body in the fitting portion of the main body.

[Effect]

The pillar portion of the unit is fitted into the groove of the main body, the first tube is fitted with the first recess of the main body, and the second tube is fitted with the second recess of the main body. By pressing this unit upwards with a spring, the unit will not come off from the main body. At this time, the main nozzle, which is constructed separately from the unit, is inserted into the main awl of the carburetor body, its lower end is supported by the unit, and the main nozzle is attached to the carburetor body.

〔Example〕

Next, the present invention will be explained based on the drawings.

FIG. 1 is a perspective view showing an embodiment of the carburetor according to the present invention, and FIG. 2 is a sectional view showing the starting system unit of FIG. 1 attached to the carburetor body.

The starting system unit 10 according to the present invention is attached to a carburetor main body 12 and placed in a float chamber 14, and mainly includes a central disc-shaped plate 16 and a space extending perpendicularly to the plate 16. a pair of open plate-shaped float pillars 18;
A first tube 2 extending perpendicularly to the plate 16 on the opposite side of the float pillar 18 with the plate 16 in between.
0 and the second tubular body 22 are integrally constructed.

A hole 24 for fitting a float pin is formed near the tip of the pair of float pillars 18, respectively. The first pipe body 20 and the second pipe body 22 communicate with each other at their bases, and a starter jet 26 is attached to the end of the communication portion between the first pipe body 20 and the second pipe body 22. Fuel is introduced into the communication portion from the starter jet 26. An O-ring 27 is fitted near the upper end of the first tube body 20 . A hole 28 for air bleed is located near the upper end of the second pipe body 22.
is formed in the second tube body 22, and the hole 28 thereof is formed in the second tube body 22.
Air is introduced from Air from the second pipe 22 and the starter jet 2 are supplied to the first pipe 20.
6 is introduced to mix the air and fuel.

A spring 32 is provided between the lower surface of the disk-shaped plate 16 and the float chamber body 30, and the spring 32 urges the unit 10 upward. This plate 16 has a hole 34 formed therein for communication with a main jet, which will be described later.

A fuel supply passage 36 that opens into the float chamber 14 is formed in the carburetor body 12, and a needle valve 38 is provided at the outlet of the fuel supply passage 36. The carburetor body 12 also includes a starter plunger 39.
Starter fuel passage 40 leading to the intake passage via
is formed.

On the surface of the carburetor body 12 facing the float chamber 14, a groove 42 for receiving the tips of the pair of float pillars 18 is formed near the position of the needle valve 38. The first pipe body 2 is also provided on the surface of the carburetor main body 12 facing the float chamber 14.
0, and a second recess 4 for fitting with the tip of the second tube body 22.
6 is formed. This first recess 44 is formed at the tip of the starter fuel passage 40.

A float pin 52 to be inserted into the hole 24 of the float column 18 is integrally fixed to the float 48 provided in the float chamber 14 at the tip of a float arm 50.

With the structure described above, when attaching the starting system unit 10 to the carburetor main body, first open the tips of the pair of float pillars 18 and fit the float pin 52 into the hole 24 of the float pillar 18. Match. Thereby, the float 48 is swingably attached to the float pedestal 18. next,
A spring 3 is installed under the plate 16 of the starting system unit 10.
2 and place the tip of the first tube body 20 in the first recess 4.
4, the tip of the second tube body 22 is fitted into the first recess 44, and the float pillar 18 is fitted into the groove 4.
2. Since the starting system unit 10 is urged upward by the spring 32, the first pipe body 2
0, the second tube body 22, and the float column 18 are tightly fitted into the first recess 44, second recess 46, and groove 42 of the carburetor main body 12, and will not come off. That is, the starting system unit 10 is connected to the carburetor main body 1.
2, and as a result, the float 48 can be considered to be swingably attached to the carburetor main body 12. At this time, even if the second recess 46 and the groove 42 are not formed in the carburetor main body 12, if the head of the first pipe body 20 and the first recess 44 are made rectangular in shape, the starting system unit 10 can be It becomes possible to securely attach it to the carburetor main body 12.

In addition, this starting system unit 10 is connected to the carburetor main body 1.
2, as shown in FIG. 3, the main nozzle 54 and main jet 56 are inserted into the main well 58 of the carburetor main body 12 in advance, and the lower end of the main jet 56 is supported by the starting system unit 10. At this time, the hole 34 of the plate 16 is aligned with the main jet 56. By this,
The main nozzle 54 and main jet 56 are attached in advance to the carburetor body 12 by the starting system unit 10 without being removed. The main well 58
Inside, there are a main nozzle 54 and a main jet 56.
It is sufficient that the main well 58 can be inserted, and there is no need for processing such as thread cutting on the main well 58.

Further, the hole 3 is provided on the lower side of the plate 16.
A skirt-like main jet ring part 60 is integrally formed at a position surrounding the four positions. On the other hand, an annular ring portion 62 extending upward is formed on the bottom surface of the float chamber body 30. These main jet ring portion 60 and ring portion 62 fit together,
A fuel reservoir chamber 64 is formed within this fitting portion. The gap between each ring part in this fitting part is made small to prevent the fuel in the fuel reservoir chamber 64 from easily coming out. Due to the presence of this fuel reservoir chamber 64, fuel can always be supplied to the main jet 56 even when there are large fluctuations in the oil level due to vertical movement of the vehicle, etc., thereby eliminating the occurrence of suffocation.

Furthermore, the L-shaped guide 66 is connected to the starting system unit 1.
It can also be mounted on the plate 16 of 0. By combining this guide 66 and the plate 16, a cylindrical portion is formed that guides the fuel from the needle valve 38 to the starter jet 26. The fuel newly supplied to the float chamber 14 through this cylindrical portion is introduced into the starter jet 26, thereby making it advantageous to restart the engine after it has been left to evaporate.

〔Effect of the invention〕

As described above, according to the vaporizer according to the present invention,
The float pedestal and the starter fuel introduction mechanism are integrated, a part of which is fitted into the carburetor body, and the integrated body is fixedly attached to the carburetor body by a spring. As a result, the work of machining the installation hole for the float pin on the float pedestal, the work of machining the air introduction hole for the starter, which was previously required,
It is possible to eliminate the assembly work of press-fitting the float pin and the assembly work of press-fitting the emulsion tube into the starter well. That is, it is possible to eliminate the processing work and assembly work that were performed on the conventional carburetor main body, and the manufacturing cost can be significantly reduced.

In addition, since the lower end of the main jet is supported by the starting system unit, the main nozzle and main jet can be simply inserted into the main well, and the main nozzle, etc. can be inserted without any machining or assembly work on the carburetor body. Can be attached to the vaporizer body.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing an embodiment of the carburetor according to the present invention, Fig. 2 is a sectional view showing the starting system unit of Fig. 1 attached to the carburetor body, and Fig. 3 is a main nozzle and a main nozzle. FIG. 3 is a sectional view showing a state in which the carburetor is supported by a main jet and a starting system unit and attached to the carburetor body. 10... Starting system unit, 12... Carburetor body, 1
4... Float chamber, 16... Plate, 18... Float pillar, 20... First pipe body, 22... Second pipe body, 24
... hole, 26 ... starter jet, 28 ... air bleed hole, 32 ... spring, 39 ... starter plunger, 42 ... groove, 44 ... first recess, 46 ... second recess, 48 ... float, 52 ... float pin, 54
...Main nozzle, 56...Main jet, 58...
main well.

Claims (1)

[Scope of Claims] 1. In a carburetor having a starter fuel passage leading to a starter plunger in the carburetor body and a float in a float chamber, a pair of spaced apart float pillars each having a float holding hole formed therein. a first pipe communicating with the starter fuel passage; a second pipe having an air bleed hole at one end and communicating with the first pipe; and the pillar and the first pipe or the second pipe. It has a starting system unit that is integrally formed with a plate interposed between the float and the float, a float pin that is inserted into a hole in the float pillar is integrally formed on the float, and the starting system unit has an oil in the float chamber. comprising a starter jet that opens downwardly and communicates with the first tube and the second tube, and a fitting portion that fits with the tip of the first tube is formed in the carburetor main body;
A carburetor characterized in that means for pressing the starting system unit is provided in the float chamber in order to fit and hold the first tube in the fitting portion of the main body. 2. The carburetor according to claim 1, wherein a main nozzle and a main jet are installed in a main well formed in the carburetor main body, and a lower surface of the main jet is supported by the starting system unit. 3. Claim 1, characterized in that the carburetor main body is provided with a fitting part that fits with the tip of the second pipe body, and a fitting part that fits with the pair of float pillars. Vaporizer as described.