JPH018685Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention provides a float chamber between the inner peripheral surface of a short cylindrical fitting part provided at the bottom of a carburetor, particularly a carburetor body having an intake passage, and the carburetor body. The outer circumferential surface of the basically cylindrical float chamber body forming the bottom is removably fitted through a sealing member, and there is a gap between the carburetor body and the float chamber body to maintain the fitted state. The present invention relates to a vaporizer provided with coupling means.

Such a carburetor is designed to make maintenance and inspection of the carburetor as easy as possible by making it easy to attach and detach the float chamber body to the carburetor main body. Furthermore, due to the clearance between the fitting surface of the fitting part and the float chamber body, there was a possibility that the float chamber body would be attached at an angle with respect to the axis of the fitting part. If the float chamber body is installed at an angle in this manner, problems such as leakage of fuel within the float chamber from between the fitting surfaces occur.

The present invention was made to solve such conventional technical problems, and with a simple configuration,
It is an object of the present invention to provide a carburetor in which a float chamber body can always be correctly attached to a fitting part without being inclined.

In order to achieve this object, according to the present invention, a pair of abutting portions that can abut on the open end surface of the fitting portion are provided on the outer peripheral surface of the short cylindrical float chamber body. The lower part of the float chamber body has an outward locking claw integrally provided at the upper end thereof, extends in the vertical direction, and is substantially orthogonal to the one diameter line of the float chamber body. The lower ends of a pair of elastic locking pieces lined up on the other diameter line are integrally supported, and between the pair of elastic locking pieces and the outer circumferential surface of the float chamber body, there is a space between the pair of elastic locking pieces and the outer peripheral surface of the float chamber body. A hole is provided to allow elastic deformation, and the pair of elastic locking pieces;
The coupling means is constituted by a pair of locking portions fixed to the outer surface of the fitting portion so as to elastically lock the locking claws of the locking pieces in the fitted state.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. First, in FIGS. 1 and 2, this carburetor 1 is used in a general-purpose engine such as a lawnmower engine, and is made of synthetic resin. A synthetic resin float chamber body 4 for forming a float chamber 3 is detachably connected to the lower part of the vaporizer main body 2.

An intake passage 5 is bored in the carburetor main body 2,
A choke valve 7 and a throttle valve 8 are pivotally supported along the intake path 5 in this order from the upstream side along the intake direction shown by the arrow 6. On the outside of the carburetor main body 2, a synthetic resin Chiyoke lever 10 is arranged, fixed to the rotating shaft 9 of the Chiyoke valve 7, and this Chiyoke lever 10 is biased by a spring in the direction of opening the Chiyoke valve 7. ing. A connecting shaft 11 is provided protruding from the yoke lever 10, and a yoke opening/closing mechanism (not shown) is connected to this connecting shaft 11. Further, a synthetic resin throttle lever 13 is arranged on the outside of the carburetor body 2 and is fixed to the rotating shaft 12 of the throttle valve 8. is connected to a governor mechanism (not shown). Moreover, the throttle lever 13 is biased by a spring in the direction of opening the throttle valve 8.

The intake pipe 5's choke valve 7 and throttle valve 8
A bench lily 15 is provided in between, and a fuel nozzle 16 is provided in the carburetor main body 2 by opening into this bench lily 15. A bleed pipe 17 is concentrically and integrally connected to the fuel nozzle 16, and a float chamber 3 is connected to the lower end of the bleed pipe 17.
A fuel jet 18, which opens into the fuel oil inside, is abutted. Moreover, a coil spring 19 is interposed between the fuel jet 18 and the bottom of the float chamber body 4, and this coil spring 19 causes the fuel jet 1 to
8 is urged upward, and the attached state of the fuel nozzle 16, bleed pipe 17, and fuel jet 18 to the carburetor main body 2 is maintained.

When the bleed pipe 17 is attached to the carburetor main body 2, a bleed passage 21 is communicated with the annular chamber 20 surrounding the bleed pipe 17, and this bleed passage 21 is located on the upstream side of the intake passage 5 from the choke valve 7. It will be opened in

Here, to explain in detail the connection structure of the float chamber body 4 to the carburetor body 2, a cylindrical fitting part 22 is integrally provided at the lower part of the carburetor body 2, and the float chamber body 4 is formed into a cylindrical shape with a bottom and a diameter that is large enough to fit into the fitting portion 22 .
An O-ring 23 as a sealing member is fitted on the outer peripheral surface of the float chamber body 4, and the float chamber body 4 is fitted into the fitting portion 22 via the O-ring 23, and its fitted state is maintained. For this purpose, coupling means 24 are provided between the carburetor body 2 and the float chamber body 4.

Referring also to FIG. 3, the coupling means 24 includes an elastic locking piece 25 whose lower end is integrally provided with the float chamber body 4 and a locking portion 26 which is integrally provided with the carburetor main body 2. Become. The elastic locking piece 25 extends vertically from the bottom of the float chamber body 4 along the outer surface of the float chamber body 4 toward the carburetor main body 2 side, and in a natural state, extends toward the tip side. It is inclined so as to move away from the side surface of the float chamber body 4. Moreover, a locking pawl 27 projecting outward is integrally provided at the tip of the locking piece 25.
Furthermore, as shown in FIG. 4, the outer surface of the locking piece 25 is provided with a structure to prevent the finger from slipping when applying the finger to press the locking piece 25 against the side surface of the float chamber body 4. , anti-slip uneven portions 28 are provided. Further, a space s is provided between the locking piece 25 and the outer surface of the float chamber body 4 to allow elastic deformation of the locking piece 25 inward, that is, toward the float chamber body 4 side.

On the other hand, the locking portion 26 is provided in a protruding manner on the outer surface of the opening end of the fitting portion 22 in the carburetor main body 2 .
In addition, this locking portion 26 has a rectangular insertion hole 29 through which the tip of the locking piece 25 can be inserted, and when the locking piece 25 is bent toward the side surface of the float chamber body 4, the locking piece 26 can be inserted. When the distal end of 25 is inserted into the insertion hole 29 and the locking piece 25 is released, the locking pawl 27 engages with the locking portion 26 elastically.

Such coupling means 24 are arranged in pairs on the fitting portion 22 and the diameter line l ₁ of the float chamber body 4 (see FIG. 3).

In the carburetor 1 configured in this way, when the float chamber body 4 is fitted into the fitting part 22 of the carburetor main body 2 and this state is held by the pair of coupling means 24, the float chamber body 4 and the fitting part 22 are held together. Due to the play between the fitting surfaces with the fitting portion 22, the float chamber body 4,
There is a risk that it may be attached to the carburetor main body 2 while swinging and tilting to one side about the one diameter line _l1 .
Therefore, another diameter line l ₂ perpendicular to the one diameter line l ₁
The float chamber body 4 has an open end surface 22a of the fitting portion 22 in the carburetor main body 2 so as to be aligned with each other on the top.
A pair of contact portions 30 that can come into contact with are provided in a protruding manner.

Next, to explain the operation of this embodiment, when attaching the float chamber body 4 to the carburetor body 2,
With the locking piece 25 bent toward the side surface of the float chamber body 4, the float chamber body 4 provided with the O-ring 23 is pushed into the fitting portion 22 until both of its contact portions 30 abut against the open end surface 22a. . Thereby, the float chamber body 4 is fitted into the fitting part 22 with the axes aligned. At this time, the tips of both locking pieces 25 are inserted into the insertion holes 29 of the locking part 26, and when both the contact parts 30 come into contact with the opening end surface 22a, the hands are released from the locking pieces 25. . Then, the locking pawl 27 elastically engages with the locking portion 26, and the state of connection between the carburetor main body 2 and the float chamber body 4 is maintained. Therefore, the float chamber body 4 is coupled to the carburetor main body 2 with its axis aligned with the fitting part 22, and the O-ring 23 can fully exhibit its sealing function.

As described above, according to the present invention, a float chamber is formed between the short cylindrical fitting part provided at the lower part of the carburetor body having an intake passage and the float chamber on the inner circumferential surface of the carburetor body. The outer circumferential surface of the bottomed cylindrical float chamber body is removably fitted to the carburetor body via a sealing member, and a coupling means is provided between the carburetor body and the float chamber body to maintain the fitted state. In the carburetor, a pair of abutting portions that can abut the opening end surface of the fitting portion are provided on the outer circumferential surface of the short cylindrical float chamber body so as to protrude so as to be lined up on one diameter line of the float chamber body; The lower part of the float chamber body has a pair of locking claws integrally provided at the upper end thereof facing outward, extending in the vertical direction, and arranged on another diameter line substantially orthogonal to the one diameter line of the float chamber body. The lower ends of the elastic locking pieces are integrally supported, and a space is provided between the pair of elastic locking pieces and the outer peripheral surface of the float chamber body to allow inward elastic deformation of the locking pieces. the pair of elastic locking pieces, and a pair of locking parts fixed to the outer surface of the fitting part to elastically lock the locking claws of the locking pieces in the fitted state. Since the coupling means is configured, when the float chamber body is fitted to the carburetor main body fitting portion, rocking of the float chamber body around the other diameter line due to play between the fitting surfaces, etc. The inclination is caused by the engagement between the abutting parts and the opening end surface, and the swinging inclination of the float chamber body around the one diameter line is caused by the engagement between the locking claws of the elastic locking pieces and the engagement part. Therefore, the float chamber body can be correctly attached to the carburetor body without tilting with respect to the axis of the fitting part, and the sealing function of the seal member can be effectively exhibited. Fuel leakage between the carburetor body and the float chamber body can be reliably prevented. In particular, the abutment part is provided protrudingly on the outer circumferential surface of the float chamber body, and is brought into contact with the open end face of the fitting part of the carburetor main body, so that the contact part can be easily seen from the outside. From the positional relationship between the contact part and the opening end surface, the amount of push of the float chamber body into the carburetor body side can be accurately grasped visually, and the float chamber body can always be properly attached to the carburetor body. Can be done. Moreover, since the contact portions are arranged in pairs so as to be lined up along one diameter line of the float chamber body, the structure of the float chamber body is simpler compared to a structure in which the contact portions are provided over the entire outer circumferential surface of the float chamber body. Moreover, since the pair of elastic locking pieces are arranged side by side on the other diameter line substantially perpendicular to the one diameter line, each elastic locking piece interferes with each contact portion. It is possible to cause a relatively large elastic deformation toward the float chamber body side without causing any damage, and to accurately engage and disengage the locking portions. Therefore, even with the special provision of the above-mentioned abutting portions, the outward movement of each elastic locking piece is prevented. The amount of overhang can be suppressed as much as possible, contributing to miniaturization of the float chamber body.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is an overall side view, Fig. 2 is an overall longitudinal sectional view, Fig. 3 is a bottom view of Fig. 1, and Fig. 4 is a portion of a locking piece. It is an enlarged side view. 1... Carburetor, 2... Carburetor body, 3... Float chamber, 4... Float chamber body, 5... Intake path, 2
2... Fitting portion, 22a... Opening end surface, 23... O-ring as a sealing member, 24... Coupling means,
25...Elastic locking piece, 26...Locking portion, 27...
Locking piece, 30...Abutment part, _l1 , _l2 ...Diameter line, s
...Empty.

Claims (1)

[Scope of utility model registration request] A short cylindrical fitting part 22 provided at the lower part of the carburetor main body 2 having an intake passage 5 has a basically bottomed cylindrical part forming a float chamber 3 between the short cylindrical fitting part 22 and the carburetor main body 2. The outer peripheral surface of the float chamber body 4 is removably fitted through the seal member 23, and
In this carburetor, a connecting means 24 is provided between the float chamber bodies 4 to maintain the fitted state, and the outer peripheral surface of the short cylindrical float chamber body 4 has an open end surface 22a of the fitting portion 22. A pair of contact portions 30 that can come into contact with the float chamber body 4 are provided in a protruding manner so as to be lined up on one diameter line _l2 of the float chamber body 4.
The lower part of the float chamber body 4 is integrally provided with an outward locking claw 27 at the upper end and extends in the vertical direction.
The lower ends of a pair of elastic locking pieces 25 lined up on another diameter line _l1 substantially orthogonal to the one diameter line _l2 are integrally supported, and the pair of elastic locking pieces 25 and the float chamber body 4
A space s is provided between the outer peripheral surface and the locking piece 25 to allow elastic deformation inward, and the pair of elastic locking pieces 25 and the locking claws of the locking pieces 25 are connected to each other. a pair of locking portions 26 fixed to the outer surface of the fitting portion 22 to elastically lock the locking portions 27 in the fitted state;
A vaporizer characterized in that the coupling means 24 is constituted by: