JPH0724604Y2 - Vaporizer automatic starter - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention adjusts the amount and concentration of an air-fuel mixture supplied to an engine,
With regard to a carburetor to be controlled, especially when starting the engine, automatically supply an optimum starting mixture to the ambient temperature of the engine,
The present invention relates to an automatic starter for a controlled carburetor.

[Conventional technology]

Conventionally, Japanese Patent Application No. 61-15294 has been used as an automatic starter for a vaporizer.
Second magnitude is known.

This will be described with reference to FIG.

Reference numeral 1 denotes a main body of the starting device, and an opening / closing valve body sliding guide hole 2 having a bottom portion 2A is formed from the upper side to the lower side,
The bottom portion 2A has a constant liquid level AA stored in the starting fuel chamber 3.
The starting fuel nozzle 4 that sinks below opens. Since the starting fuel chamber 3 is connected to the floating chamber of the carburetor (not shown) through the starting fuel inflow passage 5, the fuel in the floating chamber flows in to form a constant liquid level AA.

Further, a starting air passage 6 communicating with the atmosphere and a starting mixture passage 7 communicating with an intake passage of a carburetor (not shown) are opened in a side wall 2B of the on-off valve body slide guide hole 2.

Reference numeral 8 denotes an opening / closing valve body movably arranged in the opening / closing valve body slide guide hole 2.
The starter air-fuel mixture passage 7 is opened / closed, and the starter fuel nozzle 4 is opened / closed by the closing valve portion 8A at the bottom of the open / close valve body 8, and the needle 9 attached to the bottom portion of the open / close valve body 8 is also started. 4 into the starting fuel nozzle 4
The effective opening area of is controlled linearly.

Reference numeral 10 denotes a housing which is erected in an upper opening 2E of the opening / closing valve body sliding guide hole 2 and has a cylindrical shape, and a lower opening 10C of the inner cylinder 10A is continuous with the opening / closing valve body sliding guide hole 2 and The upper opening 10D of the cylinder 10A is open.

Further, a male screw is formed on the lower portion of the outer periphery 10E of the housing 10.

Reference numeral 11 denotes a cylindrical casing arranged on the outer periphery of the housing 10, and a female thread to be screwed into the male thread of the housing 10 is provided in the lower portion, and an upper opening portion 10D of the housing 10 is closed by an upper upper bottom portion 11B. Further, a lead wire drawing hole 11C is formed near the upper bottom portion 11B.

Thus, the male screw of the housing 10 and the female screw of the casing 11 form the screwing portion C, and the male screw of the housing 10 and the female screw of the casing 11 are screwed together so that the casing 11 is screwed to the housing 10.

In the vicinity of the upper portion of the inner cylinder 10A of the housing 10, a thermal expansion / contraction material that expands and contracts its volume by heat of paraffin, olefin, etc. is sealed inside, and a thermosensitive reaction that projects the output rod 12A at one end thereof. The body 12 is placed in an airtight manner via an elastic ring such as an O-ring. This elastic ring is the inner cylinder
10A and the heat-sensitive responder 12 are arranged so as not to come into direct contact with each other due to vibration.

Then, the other end 12B at the upper part of the heat-sensitive responder 12 and the casing 1
The PTC heater 14 having a positive temperature characteristic is arranged between the upper bottom portion 11B of the 1 and the one side surface 14A of the PTC heater 14 is in contact with the one side terminal 16A connected to the one side lead wire 15A. ,
On the other side 14B of the PTC heater 14, the other end of the heat-sensitive responder 12
12B comes into contact, and the heat-responsive body 12 comes into contact with the terminal 16B on the other side connected to the lead wire 15B on the other side via the conductive spring 15.

Therefore, the electric circuit of the PTC heater 14 has a lead wire 15A on one side.
One side terminal 16A, PTC heater 14 one side 14A, PTC
The other side surface 14B of the heater 14, the other end portion 12 of the upper portion of the heat-sensitive responder 12
B, the conductive spring 15, and the other side terminal 16B connected to the other side lead wire 15B.

[Problems to be solved by the device]

In an operating state of the engine in which the automatic starter of the carburetor is mounted on the engine together with the carburetor, vibration of the engine, vibration of the vehicle in which the engine is mounted, etc. are added to the starter. The heat-responsive body 12 having a large mass as compared with the mass may be rotated by being given a rotational force in the housing 10 and the casing 11. According to the rotation of the heat-sensitive body 12, the other end portion 12B of the heat-sensitive body 12 is
And the contact surface between the PTC heater 14 and the other side surface 14B is rubbed,
There is a possibility that the silver solder burned on the other side surface 14B of the PTC heater 14 in order to improve the electrical connection between the PTC heater 14 and the heat-sensitive body 12 may be scraped off, which is not preferable.

Here, in the conventional automatic starter of the carburetor, the spring force of the spring S, which is compressed to keep the on-off valve body 8 shown in FIG. The contact surface pressure between the other end portion 12B of 12 and the other side surface 14B of the PTC heater 14 is increased to suppress the rotation of the heat-responsive body 12.

However, by increasing the spring force of the spring S, when the casing 11 is assembled in the housing 10,
The spring S must be assembled while being compressed, and the stronger the spring force of the spring, the more difficult it is to assemble and the productivity of the starting device is impaired. Further, as another means for suppressing the rotation of the heat-sensitive body 12, the tightening margin of the elastic ring R arranged between the heat-sensitive body 12 and the inner cylinder 10A of the housing 10 may be increased. The assembling property of the responder 12 to the housing 10 is significantly deteriorated, which is not preferable.

[Means for Solving the Problem] [Operation] The automatic starter for a carburetor according to the present invention has been made in view of the above problems, and has a good assembling property in which the heat-responsive body does not rotate due to vibration of the engine. In order to achieve such a carburetor starting device, a PTC is formed by integrally arranging a collar made of a conductive material on the heat-responsive body in order to achieve the above-mentioned object and engaging the collar and the casing in the rotational direction thereof. The heat-responsive body is prevented from rotating at the connecting surface portion between the other side surface of the heater and the other end of the heat-responsive body, and the heat-sensitive body and the terminal on the other side are electrically connected via a collar.

〔Example〕

An embodiment of an automatic starter for a carburetor according to the present invention will be described below with reference to FIG.

The same structures as those in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted.

40 is an annular collar made of a conductive material such as aluminum or copper. This collar 40 is the other end 12B of the heat-sensitive responder 12.
The heat-responsive body 12 and the collar 40 are integrally fixed to each other by being press-fitted into the outer periphery in the vicinity by the press-fitting portion 40A.

Further, an engagement groove 40B is formed on the outer periphery of the collar 40 along the longitudinal direction (vertical direction in the drawing) of the heat-sensitive responder 12, and the engagement groove 40B is projected from the inner surface of the casing 11. The provided engagement protrusion 11F is fitted to the engagement groove 40B and the engagement protrusion 11
Engage with F.

Further, the upper end 40C of the collar 40 is connected to the terminal 16B on the end side.

Thus, the press-fitting portion 40A of the collar 40 is connected to the other side portion 1 of the heat-sensitive responder 12.
2B and the color by pressing into the outer periphery of 2B
40 can be formed integrally with each other, and this heat-responsive body 12 is arranged in the housing 10 and the engaging projection 11F of the casing 11 is formed.
The casing 11 with the engaging groove 40B of the collar 40 fitted.
By screwing the female screw of the heat-sensitive member to the male screw of the housing 10, the rotation of the heat-responsive body 12 is mechanically blocked.

Further, since the heat-sensitive responder 12 and the terminal 16B on the other side are electrically connected by the collar 40 made of a conductive material, the PTC heater 1
The electric circuit of 4 could be formed in the same manner as the conventional one.
The method of engaging the collar 40 and the casing 11 is not limited to the above embodiment.

[Effect of device]

According to the automatic starter of the carburetor according to the present invention, the thermosensitive body does not rotate when the thermosensitive body is subjected to vibration, and the connecting surface portion between the other end of the thermosensitive body and the other side surface of the PTC heater is It was possible to completely suppress the wear of. or,
In particular, since the collar is press-fitted into the heat-sensitive body and the rotation of the collar is restrained by the casing, the assembling property is not hindered at all.

Further, since the collar is made of a conductive material and the terminal on the other side and the heat-sensitive responder are electrically coupled by the collar, the role of the conventional conductive spring 15 can be performed by the collar. The number of parts does not increase even if the new is installed.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a conventional automatic starter for a vaporizer,
FIG. 2 is a longitudinal sectional view showing an embodiment of an automatic starter for a vaporizer according to the present invention, and FIG. 3 is a lateral sectional view taken along line III-III in FIG. 1 ...... Starting device main body, 2 ... Open / close valve body guide hole 2B ... Side wall, 6 ... Starting air passage 7 ... Starting air-fuel mixture passage, 8 ... Opening / closing valve body 10 ... Housing, 11 ... Casing 11F ...... Engagement protrusion, 40 ...... Collar 40B ...... Engagement groove

Claims (1)

[Scope of utility model registration request] 1. An opening / closing valve body sliding guide hole 2 is formed from above, and a starting fuel chamber 3 is provided at a bottom portion 2A of the opening / closing valve body sliding guide hole 2.
And a starting device main body 1 in which a starting fuel nozzle 4 connected to the opening is opened and a starting air passage 6 and a starting mixture passage 7 are opened in a side wall 2B of the opening / closing valve body sliding guide hole 2; The lower opening 10C of the inner cylinder 10A is connected to the upper opening 2E of the second cylinder 2, and the upper opening 10D of the inner cylinder 10A is opened, so that the cylindrical housing 10 is erected from the starting device body 1.
And; screwed to the outer periphery 10E of the housing 10 to close the opening of the upper opening 10D of the housing 10 and connect to one terminal 16A connected to the lead wire 15A on one side and to the lead wire 15B on the other side. A casing 11 in which a terminal 16B on the side is arranged; a thermo-expansion material is enclosed inside, and a thermo-responsive body 12 for changing the volume change due to temperature change of the thermo-expansion material by the stroke of the control rod 12A protruding from one end. And; movably arranged in the opening / closing valve body slide guide hole 2 and operated in synchronization with the control rod 12A of the heat-responsive body 12 to start the starting air passage 6, the starting mixture passage 7, and the starting fuel nozzle 4. An opening / closing valve body 8 for controlling the opening area; a PTC heater 14 arranged to be connected to the other end 12B of the heat-responsive body 12 to heat the heat-responsive body 12; one terminal 16A and one of the PTC heaters 14 The side surface 14A is connected to the other side surface 14B of the PTC heater and the other end of the heat-sensitive responder 12. 12
In the automatic starter of the carburetor, the other end of the heat sensitive body 12 is connected to B, and the heat sensitive body 12 and the terminal 16B on the other side are connected by a conductive member. An annular collar 40 made of a conductive material is integrally press-fitted on the outer periphery of the portion 12B and the collar 40
An automatic starter for a carburetor, which prevents rotation of the heat-responsive body 12 by engaging the outer periphery of the casing with the inner surface of the casing 11 in the direction of rotation thereof.