JP3866490B2 - Two-part mounting structure for vaporizer - Google Patents

Description

BACKGROUND OF THE INVENTION
According to the present invention, first and second attachment holes are opened in first and second attachment surfaces formed at an angle to the vaporizer body, and the first and second parts are provided in the first and second attachment holes. It is related with the attachment structure of two parts in the vaporizer which fitted.
[Prior art]
Conventionally, in the mounting structure of two parts in such a vaporizer, the first and second parts are respectively held by first and second holding plates fixed to the vaporizer body.
[Problems to be solved by the invention]
In the conventional structure as described above, in addition to the two holding plates for individually holding the first and second parts, a plurality of screws for fixing each holding plate to the vaporizer body are necessary. In addition to the large number of installation steps, it was an obstacle to cost reduction.
The present invention has been made in view of such circumstances, and the first and second parts can be attached to the vaporizer body with one holding plate and one screw. An object is to provide a mounting structure.
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, first and second mounting holes are opened in first and second mounting surfaces formed at an angle to a vaporizer body, and the first and second mounting surfaces are opened. In the mounting structure of two parts in the vaporizer, in which the first and second parts are fitted in the holes, an annular groove is provided on the outer peripheral surface of the first part, while a holding part is provided on the second part, and a single holding plate In addition, in order to prevent the first component from being detached from the first mounting hole, the first plate portion having a notch-like notch engaged with the annular groove and the second component from being detached from the second mounting hole. A first feature is that a second plate portion that abuts against the pressing portion is formed to prevent the first plate portion from being fixed to the vaporizer body with a single screw.
According to the first feature, after the first part is fitted into the first mounting hole and the second part is fitted into the second mounting hole, the first plate portion is cut into the annular groove portion of the first part. By fitting the notch and bringing the second plate portion into contact with the pressing portion of the second component, and fixing the first plate portion to the carburetor body with one screw in this state, the first and second It is possible to prevent the parts from being detached from the first and second mounting holes. In addition, the rotation of the holding plate around the screw is firmly prevented by the inner surface of the notch contacting the groove bottom peripheral surface of the annular groove of the first component and the second plate portion contacting the pressing portion. Is done. In this way, it becomes possible to hold the first and second parts in the first and second mounting holes with one holding plate and one screw, and not only the number of parts of the mounting structure but also the number of mounting steps can be greatly reduced. Will bring.
In addition to the first feature of the present invention, the cutout is formed into a cut-out shape of a dominant arc so as to be fitted to a portion of the circumferential surface of the bottom of the annular groove of the first part. A second feature is that an assembly of the first component and the holding plate is configured by pushing the groove bottom peripheral surface of the annular groove into the notch.
According to the second feature, when the first and second parts are mounted, the assembly is first configured. After the first and second parts are fitted into the first and second mounting holes, the first and second parts are held. Only by rotating the plate around the axis of the first component, the contact position of the second plate portion with the pressing portion can be easily obtained, and the assemblability becomes extremely good.
Furthermore, in addition to the first or second feature, the third feature of the present invention is that the first part is a starting valve unit, and the second part is an air introduction pipe of a variable venturi device.
According to the third feature, the fitting state of the starting valve unit and the first and second mounting holes of the atmospheric introduction pipe can be easily held by one holding plate and one screw. .
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below based on one embodiment of the present invention shown in the accompanying drawings.
1 is a front view of a vaporizer equipped with the mounting structure of the present invention, FIG. 2 is a side view of the vaporizer, FIG. 3 is a sectional view taken along line 3-3 in FIG. 2, and FIG. Sectional drawing and FIG. 5 are perspective views of a holding plate.
First, in FIGS. 1 and 2, the carburetor C is a constant vacuum type, and the carburetor body 1 is a variable venturi device for constantly controlling the negative pressure in the venturi portion of the intake passage 2 extending in the horizontal direction. 3 and a starting valve unit 4 for supplying a rich mixture to the intake passage 2 when the engine is started.
The variable venturi device 3 is operated by a negative pressure chamber (not shown) communicating with the venturi portion of the intake passage 2, an atmospheric chamber 5 communicating with the atmosphere, and a pressure difference between these chambers, and the venturi portion of the intake passage 2. It has a known structure comprising a venturi piston that moves up and down. The atmosphere chamber 5 communicates with an air cleaner (not shown) through an atmosphere introduction pipe 6 attached to the vaporizer body 1 and a rubber tube 7 connected thereto.
Further, the starting valve unit 4 determines whether the engine has the bypass path 8 formed in the carburetor body 1 so as to bypass the throttle valve in the intake passage 2 and the opening degree of the starting fuel nozzle 9 opening in the bypass path 8. It is controlled automatically according to the temperature, and is operated by the housing 10 attached to the vaporizer body 1, the temperature sensing device 11 housed and supported in the housing 10, and the temperature sensing device 11. The piston valve 12 that opens and closes the bypass path 8 and a needle valve 13 that is attached to the piston valve 12 and inserted into the start fuel nozzle 9 have a known structure. The temperature-sensitive actuator 11 includes an electric heater that generates heat in inverse proportion to the engine temperature, and wax heated thereby, and when the engine is started, the piston valve 12 and the needle valve 13 are opened relatively large, and a bypass passage is provided. In FIG. 8, a relatively large amount of rich air-fuel mixture is generated. However, when the engine temperature rises, the piston valve 12 and the needle valve 13 are closed to reduce the amount of rich air-fuel mixture generated. The rich air-fuel mixture generated in the bypass passage 8 is sucked into the engine through the intake passage 2.
In the above, the starting valve unit 4 and the air introduction pipe 6 correspond to the first and second parts of the present invention, and the mounting structure to the carburetor body 1 will be described next.
As shown in FIGS. 1 to 4, the carburetor body 1 has first and second attachment surfaces 15 and 16 that are substantially perpendicular to each other, and first and second attachments that open to these attachment surfaces 15 and 16. Holes 17 and 18 are formed, and one end of the housing 10 of the starting valve unit 4 is fitted to the first mounting hole 17 via a seal member 31, and the atmosphere introduction pipe is inserted into the second mounting hole 18. One end of 6 is fitted through a seal member 32.
A flange 20 and an annular groove 21 located immediately above the flange 20 are provided on the outer peripheral surface of the housing 10. The flange 20 abuts on the first mounting surface 15 to regulate the fitting depth of the housing 10 into the first mounting hole 17.
On the other hand, the air introduction pipe 6 has a pipe part 6a which is bent obliquely from one end part fitted into the second mounting hole 18 to one side, and a flange 22 is formed on the outer peripheral surface of the pipe part 6a. Above the flange 22, a flange-shaped pressing portion 23 arranged in parallel with the flange 22 is integrally formed. The flange 22 abuts on the second mounting surface 16 to regulate the fitting depth of the atmospheric introduction pipe 6 into the second mounting hole 18.
The housing 10 and the air introduction pipe 6 are held at the fitting positions of the first and second mounting holes 17 and 18 by a single holding plate 25 and one screw 29. The holding plate 25 is made of metal or synthetic resin. As shown in FIGS. 3 to 4, the first and second bent bent substantially at right angles to the first and second mounting surfaces 15 and 16. The first plate portion 25a is provided with a notch 26 and a through hole 27 disposed on one side of the notch 26.
The notch 26 has a notch shape with a dominant arc so as to be fitted to a part of the circumferential surface of the bottom of the annular groove 21 of the housing 10 that is more than half a circle. That is, the width B of the opening of the notch 26 is set slightly smaller than the groove bottom diameter D of the annular groove 21.
Thus, when elastic deformation is applied to the first plate portion 25a, when the portion of the annular groove 21 of the housing 10 is pushed into the notch 26 from the opening, it is more than half the circumference of the groove bottom circumferential surface of the annular groove 21. This part is fitted and coupled to the notch 26 so that an assembly 28 of the starting valve unit 4 and the holding plate 25 is constructed.
The first plate portion 25 a is fixed to the first mounting surface 15 by screwing and tightening a screw 29 passed through the through hole 27 into a screw hole 33 provided at a predetermined position of the vaporizer body 1.
The second plate portion 25b comes into contact with the outer surface of the holding portion 23 of the air introduction tube 6 in a state where the first plate portion 25a is fixed to the first mounting surface 15, and the second plate portion 25b Is provided with a bent portion 30 which is bent so as to receive one side surface of the pipe portion 6a of the air introduction pipe 6.
Next, the operation of this embodiment will be described.
In attaching the starting valve unit 4 and the atmosphere introduction pipe 6, first, the annular groove 21 portion of the housing 10 is pushed into the notch 26 of the first plate portion 25a, and the assembly of the starting valve unit 4 and the holding plate 25 is performed. Make 28. In this assembly 28, the holding plate 25 can rotate around the axis of the housing 10. Next, after fitting one end portion of the housing 10 into the first mounting hole 17 and one end portion of the atmosphere introduction pipe 6 into the second attachment hole 18, the second plate portion 25 b is attached to the outer surface of the holding portion 23 of the atmosphere introduction pipe 6. The holding plate 25 is positioned so as to come into contact with. At that time, due to the structure of the assembly 28, the contact position of the second plate portion 25b with the pressing portion 23 can be easily obtained simply by rotating the holding plate 25 around the axis of the housing 10. Is very good.
Thus, the housing 10 is held by the first plate portion 25a and does not come out of the first mounting hole 17, and the atmosphere introduction pipe 6 is held by the second plate portion 25b and is held in the second mounting hole. There is no way out of 18. Moreover, even if the holding plate 25 receives an external force around one screw 29, the inner surface of the notch 26 abuts against the groove bottom peripheral surface of the annular groove 21, and the second plate portion 25b is the first mounting surface. By abutting against the pressing portion 23 that is in a substantially right-angle relationship with 15, rotation around the screw 29 is firmly prevented.
Thus, with one holding plate 25 and one screw 29, the fitting position between the starting valve unit 4 and the first and second mounting holes 17 and 18 of the atmospheric introduction pipe 6 can be held, and the mounting structure As a result, not only the number of parts, but also the installation man-hours can be greatly reduced, and the cost can be greatly reduced.
The present invention is not limited to the above embodiment, and various design changes can be made without departing from the scope of the invention.
【The invention's effect】
As described above, according to the first feature of the present invention, the first and second mounting holes are opened in the first and second mounting surfaces formed at an angle to the vaporizer body, and the first and second mounting holes are opened. In the mounting structure of two parts in a vaporizer in which the first and second parts are fitted in the second mounting hole, an annular groove is provided on the outer peripheral surface of the first part, while a pressing part is provided on the second part. A first plate portion having a notch that is engaged with the annular groove to prevent the first component from being detached from the first mounting hole, and a second mounting hole of the second component. A second plate portion that abuts against the pressing portion to prevent detachment of the first plate portion, and the first plate portion is fixed to the carburetor body with one screw, so that one holding plate and one screw are used. The fitting state of the first and second parts with the first and second mounting holes can be maintained. Not parts of attaching structure only, resulted in a significant reduction of mounting steps, it is possible to reduce the cost greatly.
According to the second feature of the present invention, the notch is formed into a notch shape with a dominant arc so as to be fitted to a part of the circumferential surface of the bottom of the annular groove of the first part. Since the assembly of the first part and the holding plate is constructed by pushing the groove bottom peripheral surface of the annular groove into the first, the assembly is improved by the construction of the assembly first when the first and second parts are attached. be able to.
Furthermore, according to the third feature of the present invention, since the first part is the starting valve unit and the second part is the atmospheric introduction pipe of the variable venturi device, one holding plate and one screw are provided. Thus, the fitting state of the starting valve unit and the first and second mounting holes of the atmospheric introduction pipe can be easily maintained.
[Brief description of the drawings]
FIG. 1 is a front view of a carburetor having a mounting structure according to the present invention.
FIG. 2 is a side view of the vaporizer.
3 is a cross-sectional view taken along line 3-3 in FIG.
4 is a cross-sectional view taken along line 4-4 of FIG.
FIG. 5 is a perspective view of a holding plate.
[Explanation of symbols]
C: carburetor 1 ... carburetor body 3 ... variable venturi device 4 ... first part (starting valve unit)
6 ... 2nd part (atmosphere introduction pipe)
15... 1st mounting surface 16... 2nd mounting surface 17... 1st mounting hole 18. 25 .... Holding plate 25a ... first plate portion 25b ... second plate portion 26 ... notch 28 ... assembly 29 ... screw

Claims (3)

First and second attachment holes (17, 18) are opened in first and second attachment surfaces (15, 16) formed at an angle to the vaporizer body (1), and the first and second attachment holes (17, 18) are opened. In the mounting structure of two parts in the vaporizer in which the first and second parts (4, 6) are fitted in the mounting holes (17, 18),
While the annular groove (21) is provided on the outer peripheral surface of the first part (4), the holding part (23) is provided on the second part (6), and the first part (4) is provided on a single holding plate (25). A first plate portion (25a) having a notch (26) engaged with the annular groove (21) to prevent the first mounting hole (17) from being detached, and a second component (6) ) From the second mounting hole (18) to form a second plate portion (25b) that comes into contact with the pressing portion (23), and the first plate portion (25a) is connected to one screw ( 29) A two-part mounting structure for a carburetor, characterized by being fixed to the carburetor body (1). In the mounting structure of two parts in the vaporizer according to claim 1,
The notch (26) is formed into a notch shape with a dominant arc so as to be fitted to a portion of the circumferential surface of the bottom of the annular groove (21) of the first part (4) which is not less than a half circle. An assembly structure of two parts in a carburetor, wherein the assembly (28) of the first part (4) and the holding plate (25) is configured by pushing the groove bottom peripheral surface of the annular groove (21) into . In the mounting structure of two parts in the vaporizer according to claim 1 or 2,
A two-part mounting structure in a carburetor, wherein the first part is a starting valve unit (4) and the second part is an air introduction pipe (6) of a variable venturi device (3).

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