JPH0110432Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a fixing structure for a carburetor jet.

Prior Art Conventional vaporizers generally have metal bodies;
Various types of jets are fixed to the body in an airtight manner by screwing the male threaded part integrally formed on the jet into the female threaded part formed on the body and tightening, as described in, for example, Japanese Utility Model Publication No. 54-26444. It was starting to happen. However, if such a fixing structure is applied as is to a synthetic resin body, there is a problem in that the female thread on the body side becomes loose each time the jet is attached or detached, and the fixing force and airtightness are rapidly lost. Ta. Further, with the fixing structure in which the male and female screw portions are screwed together, there is a problem in that it is quite troublesome to attach and detach the jet.

Purpose In view of the above-mentioned problems, the present invention aims to provide a fixing structure for a carburetor jet, which has almost no deterioration in fixing force and airtightness even when the jet is repeatedly attached and detached, and which also allows for easy attachment and detachment of the jet. It is something to do.

Outline The carburetor jet fixing structure according to the present invention is
A low-elasticity material that has an engaging part integrally formed around the opening periphery of the jet insertion hole provided in the body, a jet fixed to the lower end, an overhanging part at the top, and a sealing part around the outer periphery of the central part. The jet holder has a jet holder made of aluminum, and after the jet holder is inserted into the jet insertion hole, the projecting portion is engaged with the engaging portion.

Embodiment Hereinafter, the present invention will be explained in detail based on an embodiment shown in FIGS. 1 and 2. 1 is a synthetic resin carburetor body, 2 is an intake cylinder, 3 is a throttle valve, and 4 is a carburetor body made of synthetic resin. is the float chamber, 5 is the main jet, 6
is the main air jet, 7 is the emulsion tube, 8 is the main nozzle, 9 is the slow system fuel passage,
10 is a pilot air jet, 11 is a slow system air passage, and 12 is a slow system mixture passage. 1
Reference numeral 3 denotes a jet insertion hole 14 which is formed at the gathering portion of each of the passages 9, 11, and 12 of the body 1, and whose bottom opening (end opening of the slow system fuel passage 9) has a peripheral edge formed as a seat portion 13a. , 14 are a pair of left and right hook-like claws integrally formed on the opening periphery of the jet insertion hole 13, 15 is a pilot jet,
16 has a lower end fixed to the jet 15, a pair of left and right protruding parts 16a, 16a on the top, and a seal part 16 with a corrugated cross section (labyrinth type) on the outer periphery of the center part.
The jet holder is made of a low-elasticity material such as synthetic resin and is provided with b and b, respectively. The low-elasticity material is preferably a resin material such as polyacetal or PPS, and this low-elasticity material has low elasticity to the extent that it can bend the projecting portion 16a and the like. still,
The distance between the pair of claw parts 14, 14 is larger than the diameter of the seal part 16b of the jet holder 16, and smaller than the diameter including the overhang parts 16a, 16a (FIG. 2). Also, jet holder 1
Protrusions 16a', 16a' are formed on both sides of the overhanging parts 16a, 16a, respectively (FIG. 2).
Further, the height from the lower end surface of the jet 15 to the upper surface of the projecting portions 16a, 16a of the jet holder 16 is the height from the bottom surface of the jet insertion hole 13 to the claw portions 14, 1.
The height is selected to be slightly larger than the height to the bottom surface of 4. Further, the diameter of the seal portion 16b of the jet holder 16 is selected to be slightly larger than the diameter of the jet insertion hole 13.

Since the jet fixing structure according to the present invention is constructed as described above, the jet holder 16 with the jet 15 fixed to the lower end can be attached to the projecting portion 16a,
16a is inserted into the jet insertion hole 13 in the position shown by the dashed line in FIG.
6a, 16a are bent downward and rotated to the right or left, and the overhanging portion 16 is rotated as shown by the solid line in FIG.
If the user releases his/her hand while a, 16a is positioned below the claws 14, 14, the projecting parts 16a, 16a engage with the claws 14, 14 from below. In this case, the height from the lower end surface of the jet 15 to the upper surface of the projecting portions 16a, 16a of the jet holder 16 is slightly larger than the height from the bottom surface of the jet insertion hole 13 to the lower surface of the claw portions 14, 14. Since the projecting portions 16a, 16a are still slightly bent downward, the lower end surface of the jet 15 is pressed against the seat portion 13a due to the resulting elasticity, and the airtightness between the two portions (slow system The airtightness of the connection between the fuel passage 9 and the jet 15 is ensured.
Furthermore, in this case, the diameter of the seal portion 16b is selected to be slightly larger than the diameter of the jet insertion hole 13, so that the seal portion 16b and the jet insertion hole 1
3 (jet insertion hole 13)
The airtightness of the opening is also ensured. Moreover, in this case, each protrusion 16a'16 of the overhanging parts 16a, 16a
Since rotation of the jet holder 16 is prevented by the action of a' and the claws 14, there is no possibility that the jet holder 16 will come out of the jet insertion hole 13 due to vibration or the like. Furthermore, as is clear from the above results, the overhanging portions 16a, 16a and the claw portions 14,
The jet 15 is vertically fixed in the jet insertion hole 13 by the vertical fixing action and rotation prevention action by the seal portion 16b and the lateral fixing action by the inner wall of the jet insertion hole 13. Also, Jet 15
In order to remove the jet holder 16 from the jet insertion hole 13, it is sufficient to rotate the jet holder 16 to the position shown by the dashed line in FIG. Therefore, the attachment and detachment of the jet 15 in the fixing structure of the present invention is much easier than in the conventional screw-fitting type. Further, since the fixing structure of the present invention uses the above-mentioned engagement method, the fixing force and airtightness hardly deteriorate even if the jet 15 is repeatedly attached and detached.

FIG. 3 shows a second embodiment, which is partially different from the first embodiment and includes a jet holder 16.
A flange-shaped seal portion 16 provided on the outer periphery of the central portion of
The airtightness of the opening of the jet insertion hole 13 is ensured by bringing b' into pressure contact with the inner peripheral edge of the opening of the jet insertion hole 13. FIG. 4 shows a third embodiment, which is partially different from the first embodiment, in which a jet 15' is buried in the lower end of the jet holder 16, and a labyrinth type jet 15' is provided around the outer periphery of the lower end. By bringing the seal portion 16c into close contact with the inner circumferential surface of the jet insertion hole 13, airtightness of the connecting portion between the slow system fuel passage 9 and the jet 15' is ensured. FIG. 5 shows a fourth embodiment, which is partially different from the third embodiment, in that an O-ring 17 attached to the outer periphery of the central part of the jet holder 16 is attached to the inner peripheral surface of the jet insertion hole 13. By tightly fitting the jet insertion hole 13
In addition, by pressing the lower end surface 16d of the jet holder 16 against the seat portion 13a, the airtightness of the connection between the slow system fuel passage 9 and the jet 15' is ensured. It is something. FIG. 6 shows a fifth embodiment, which is partially different from the third embodiment, and has an annular projection integrally formed at the opening periphery of the jet insertion hole 13 and whose outer periphery protrudes outward. The jet 15' is inserted into the jet insertion hole by fitting a crown-shaped projecting part 19 integrally formed on the top of the jet holder 16 and having an inner peripheral edge protruding inward to the strip 18 and engaging both peripheral edges. It is designed to be fixed within 13.

Effects of the invention As mentioned above, according to the jet fixing structure according to the present invention, the fixing force and airtightness hardly deteriorate even if the jet is repeatedly attached and detached, and the jet can be easily attached and detached, which is extremely important in practical terms. It has many advantages.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a carburetor having an embodiment of the jet fixing structure according to the present invention, FIG. 2 is a plan view of the main part of the above embodiment, and FIGS. It is a longitudinal cross-sectional view of the fifth embodiment. 1... Carburetor body, 9... Slow system fuel passage, 11... Slow system air passage, 12... Slow system mixture passage, 13... Jet insertion hole, 13
a... Seal part, 14... Hook-shaped claw part, 15...
Pilot jet, 16...Jet holder, 16a...Protrusion, 16a'...Protrusion, 16
b...Seal part.

Claims (1)

[Scope of Claim for Utility Model Registration] A jet insertion hole provided in the body and having an engaging part integrally formed around the opening periphery, a jet fixed to the lower end, and a jet inserted into the top part by bending. A removable projecting portion that can be engaged by pressing or fitting into the engaging portion is provided, and a sealing portion that is in close contact with the inner circumferential surface of the jet insertion hole is provided on the outer periphery of the central portion. A carburetor jet fixing structure comprising: a jet holder made of a material with low elasticity that is capable of bending the jet;