JPH0649881Y2 - Vaporizer starter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a carburetor starter.

[Conventional technology]

Examples of conventional starters of this type include those disclosed in Japanese Utility Model Publication No. 52-12823 and Japanese Utility Model Publication No. 62-203949 proposed by the present applicant. Of these, the latter starter will be described with reference to FIG. 3. A starter air passage 1 formed in the carburetor main body MB, a starter air-fuel mixture inlet passage 2 connected to a well (not shown), and not shown. A cylinder chamber 4 having a rectangular cross-section is provided at a connection portion with a mixture-starting gas mixture outflow passage 3 connected to the manifold, and the mixture-mixing gas outflow passage 3 for start-up is opened in one flat surface 4a of the inner surface of the cylinder chamber 4. The starting air passage 1 is opened in the other flat surface 4b facing the flat surface 4a, and the starting air-fuel mixture inlet passage 2 is opened in the bottom surface 4c. A plunger 5 having a substantially U-shaped vertical cross section is fitted in the cylinder chamber 4 so as to be slidable in the vertical direction, and a skirt portion 5b opposite to the flat surface 5a in contact with the flat surface 4a is thin and slightly The flat surface 5a of the plunger 5 is formed into the flat surface 4a by being formed in the outwardly bent shape.
It has a spring property such that it is pressed against. And
When the plunger 5 moves downward, the flat surface 5a of the plunger 5 is moved to the cylinder chamber 4 by the spring action of the skirt portion 5b.
The air-fuel mixture outflow passage 3 for start-up is closed by being pressed against the flat surface.

[Problems to be solved by the device]

However, with such a configuration, in order to process the skirt portion 5b of the plunger 5 outwardly and to improve the sealing performance for the opening of the mixture gas outflow passage 3 for starting, the machining accuracy of the flat surface 5a is improved. There is a problem in that the number of processing steps for the plunger 5 is increased, such as the need to make it precise.
Further, the plunger 5 was not necessarily sufficient in wear resistance and heat resistance due to its structure.

In view of these problems, the present invention improves the sealing performance for the starting air-fuel mixture outflow passage, the heat resistance and wear resistance of the plunger, and reduces the assembly and processing man-hours to reduce the manufacturing cost. It is an object to provide a carburetor starter that has been achieved.

[Means for Solving the Problems]

A carburetor starter according to the present invention is provided with a cylinder chamber provided at a connection position of a start air passage, a start mixture mixture inflow path, and a start mixture mixture outflow path, and slidably fitted in the cylinder chamber. And a seal plate that is mounted on the plunger and that is pressed against the opening of the starting air-fuel mixture outflow passage in the cylinder chamber by its own elasticity.

[Action]

Therefore, the up / down movement of the plunger opens and closes the starting air-fuel mixture outflow passage and the inflow passage, but the sealing plate is pressed against the opening of the starting air-fuel mixture outflow passage by its own elasticity to block the air-fuel mixture. Can be improved.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 2 and 3. However, the same parts as those of the conventional device are designated by the same reference numerals and the description thereof will be omitted. In the figure, reference numeral 6 denotes a plunger having a rectangular horizontal cross section and a substantially U-shaped vertical cross section, which is slidably inserted in the cylinder chamber 4 in the vertical direction, and faces the opening of the starting mixture flow-out passage 3. The flat surface 6a is formed substantially at right angles to the top surface 6c and has a slight gap between the flat surface 6a and the flat surface 4a of the cylinder chamber 4, and the flat surface 6b facing the starting air passage 1 is provided.
Is formed so as to be bent outward. 7 is an operating rod fixed to the top surface 6c of the plunger 6, and 8 is a disc.
A needle 8a which is fixed to the bottom surface of the plunger 6 and which can be inserted into and removed from the starting air-fuel mixture inflow passage 2, and 9 is mounted on the flat surface 6a and the top surface 6c of the plunger 6 with a substantially L-shaped cross section. The seal portion 9a, which is one of the portions of the seal plate 9 located on the side of the plane 6a, is a sealed metal plate and has a tip end (lower end in the figure) bent in the direction of the plane 6a. It does not hinder the sliding of 6 and the supporting portion 9b, which is the other portion of the seal plate 9, has a hole in the center portion through which the operating rod 7 is inserted. The seal portion of the seal plate 9 is shown in FIG.
9a and the support portion 9b form a small obtuse angle, and the seal portion 9a is crimped to the flat surface 6a side of the plunger 6 in a state where the support portion 9b is inserted into the cylinder chamber 4 and the support portion 9b is elastically pressed by a spring described later. The seal plate 9 is provided with elasticity so that it is bent at a substantially right angle to the support portion 9b and pressed against the flat surface 4a of the cylinder chamber 4. 10 is a support portion of the seal plate 9
It is a spring which gives the habit of moving the plunger 6 in the downward direction of FIG.

The present embodiment has the above-described configuration, and the vertical movement of the plunger 6 causes the starting air-fuel mixture inflow passage 2 to be opened and closed by the needle 8, and at the same time the starting air-fuel mixture outflow passage 3 to be opened and closed. , The sealing portion 9a of the sealing plate 9
Is pressed against the flat surface 4a in the cylinder chamber 4 by its own elastic action, and the opening of the starting mixture gas outflow passage 3 is closed. Since this seal plate 9 is a metal plate, it is easy to impart flatness and elasticity, and the hermeticity with respect to the opening of the starting mixture gas outflow passage 3 can be improved.

As described above, in the starting device according to the present embodiment, the air-fuel mixture outflow passage is closed by the seal plate regardless of the plunger. Therefore, the sealing performance for the air-fuel mixture outflow passage for starting, and the heat resistance and wear resistance of the plunger are provided. The manufacturing cost can be reduced by reducing the number of assembly steps and processing steps of the device.

The structure of the seal plate 9 is not limited to the above-mentioned embodiment, and may be, for example, only the seal portion 9a and fixed to the flat surface 6a or the top surface 6c of the plunger 6 with a screw or the like. .

[Effect of device]

As described above, according to the carburetor starting device of the present invention,
Since the opening of the starting air-fuel mixture outflow passage in the cylinder chamber is closed by the elasticity of the seal plate, the sealing performance against the opening of the air-fuel mixture outflow passage, the heat resistance and wear resistance of the plunger can be improved, and the number of assembly steps can be increased. It is possible to reduce the manufacturing cost by reducing the number of man-hours and processing steps.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part showing an embodiment of a starting device according to the present invention, FIG. 2 is a sectional view of a plunger and a seal plate, and FIG.
The figure is a cross-sectional view of a conventional device. 1 ... Starting air passage, 2 ... Starting air-fuel mixture inflow passage, 3
...... Starting mixture air outflow passage, 4 ...... Cylinder chamber, 6 ...... Plunger, 9 ...... Seal plate, 9a ...... Seal part.

Claims (1)

[Scope of utility model registration request] 1. A cylinder chamber provided at a connection position of a starting air passage, a starting air-fuel mixture inflow passage, and a starting air-fuel mixture outflow passage, and a plunger slidably fitted in the cylinder chamber. A starter for a carburetor, comprising: a seal plate attached to the plunger, and brought into pressure contact with an opening of an air-fuel mixture outflow passage for starting in the cylinder chamber by its elasticity.