JP2001317407A - Automatic starting device of carburetor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve startability by precisely controlling starting mixture and to improve hot startabiilty of an engine by improving a heat insulation characteristic of a temperature-sensitive driving body. SOLUTION: This automatic starting device comprises a starting device body B and a cover holder J. The starting device body B comprises integrally formed wax holder F for storing the temperature-sensitive driving body C, a starting valve V, and a valve body G having a starting air passage 11, a starting mixture passage 12, and a starting fuel passage 10. The cover holder J has terminals T1 and T2 electrically connected to a heater 13. A valve body G of the starting device body B is inserted into and disposed in a valve body insert recessed part A1 in a base body A, the upper bottom J1 of the cover holder J is brought into contact with a collar K of the wax holder F through the heater 13 held by the terminals T1 and T2, and a cylindrical part J2 of the cover holder forms an annular interior part P in a substantially closed shape on the outer periphery of the wax holder F.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a carburetor for controlling the concentration and amount of an air-fuel mixture supplied to an engine. The present invention relates to an automatic starter for a carburetor that supplies a starting air-fuel mixture to an engine and gradually and automatically reduces the starting air-fuel mixture as the engine warms up.

[0002]

2. Description of the Related Art A conventional automatic starter for a vaporizer will be described with reference to FIG. Reference numeral 1 denotes a carburetor body formed with an intake passage 2 penetrating therethrough. The intake passage 2 is opened and closed by a throttle valve 3. A float chamber main body 4 is disposed below the vaporizer main body 1, and a float chamber 5 is formed by the vaporizer main body 1 and the float chamber main body 4. In the float chamber 5, a float (not shown), a float valve, A constant fuel level is formed by a constant level control mechanism comprising a valve seat. Reference numeral 60 denotes a wax holder insertion concave portion which is concavely formed downward from the upper end of the base main body P (the carburetor main body 1), and a start valve guide hole 61 is further concavely formed from the bottom thereof. A starting fuel passage 62 is provided at the bottom of the starting valve guide hole 61 and extends below the fuel level in the float chamber 5, and a starting air passage connected to the intake passage 2 upstream of the throttle valve 3 is formed on a side of the starting fuel passage 62. 63 and a starting air-fuel mixture passage 64 connected to the intake passage 2 downstream of the throttle valve 3 are opened. And the starting fuel passage 6
2 is controlled by a needle N attached to a start valve V movably arranged in a start valve guide hole 61,
The starting mixture passage 64 and the starting air passage 63 are controlled by the lower end VB of the starting valve V. The wax holder 65 has a cylindrical shape with an opening at the top and bottom, and the lower cylinder portion is the base body A.
The female screw 6 is inserted into the wax holder insertion concave portion 60, and the inner circumference of the upper cylindrical portion protruding from the base main body A is provided.
5A is formed. And this wax holder 65
The female screw 65A has an upper bottom portion 66A, and a bottomed cup-shaped cover holder 66 that opens downward is screwed and arranged. In the cover holder 66, an upper bottom 66 is provided.
A heater (PTC heater) 68 sandwiched between the terminals 67A and 67B toward A, and a collar 69 abutted thereon.
Is arranged. C is a temperature-sensitive driving member, in which a thermo-expandable material such as paraffin or olefin is enclosed, and a change in their volume is output as a stroke displacement of the output rod C1. Are arranged facing the collar 69. D is a transmission member that moves in synchronization with the displacement of the output rod C1, and the downward displacement of the transmission member D is transmitted to the starting valve V via the spring force of the first spring S1, and the transmission member D In the upward displacement, the starting valve V is mechanically pulled up by the locking flange D1. The transmission member D is urged upward by a second spring S2 having a spring force stronger than the spring force of the first spring S1, whereby the temperature-sensitive drive member C including the output rod C1, the collar 69, and the like. Heater 6 including the terminals 67A and 67B
8 is elastically pressed and fixed to the upper bottom 66A of the cover holder 66. Then, the stay 70 is engaged with the groove 65 </ b> B formed on the outer periphery of the wax holder 65, and the stay 70 is screwed to the base body A, whereby the starting device is fixed to the base body A. Reference numeral 71 denotes a heat insulating cover which is disposed so as to surround the outer periphery of the wax holder 65 and the outer periphery of the cover holder 66.
1, a downward opening 71A is formed, and a terminal 67A,
A lead wire 72 connected to 67B extends outward through this opening 71A.

When the temperature of the engine atmosphere is equal to or higher than a predetermined temperature, the volume of the heat-expandable material sealed in the temperature-sensitive driving member C expands greatly, and the output rod C1 protrudes largely downward. . According to this, the starting valve V is disposed below the starting valve guide hole 61, the starting fuel passage 62 is closed by the valve portion VA, and the starting air passage 63 and the starting mixture passage 64 are connected to the side of the starting valve V. Is held closed. According to the above description, during the start operation of the engine, the starting air-fuel mixture is not supplied to the engine from the starting air-fuel mixture passage 64, and the air-fuel mixture corresponding to a temperature state equal to or higher than a certain temperature is supplied via the fuel supply system of the carburetor. Supplied to the organization.

[0004] Next, in a state where the engine ambient temperature is equal to or lower than the predetermined fixed temperature, the volume of the thermal expansion / contraction material sealed in the temperature-sensitive driving body C decreases, and the protrusion of the output rod C1 decreases. According to this, the transmission member D moves upward so as to contact the output rod C1 by the spring force of the second spring S2, and the start valve V moves upward in synchronization with the transmission member D. And according to the upward movement of the starting valve V,
The valve portion VA opens the starting fuel passage 62 and the effective opening area of the starting fuel passage 62 is determined by the needle N, while the starting air passage 63 and the starting air-fuel mixture passage 64 are opened by the side of the starting valve V. . In such a state, when the engine start operation is performed, the starting fuel passage 62
The starting fuel inside is determined by the effective opening area controlled by the needle N and is sucked into the starting valve guide hole 61, while the starting air corresponding to the opening by the starting valve V is supplied from the starting air passage 63 to the starting valve guide. It is sucked into the hole 61.
Then, in the starting valve guide hole 61, the starting fuel and the starting air are mixed to form a starting air-fuel mixture. The starting air-fuel mixture corresponds to the opening of the starting valve V and enters the starting air-fuel mixture passage 64. The starting air-fuel mixture is sucked and added to the fuel supplied from the fuel supply system of the carburetor, whereby the engine is started at a low temperature.

After the engine is started, the engine enters a warm-up operation. During the warm-up operation, the heater 68 is energized through the terminals 67A and 67B.
According to the above description, the heater 68 generates heat, and this heat is transmitted to the temperature-sensitive driving body C via the collar 69 to warm the temperature-sensitive driving body C. When the temperature-sensitive driving body C is heated, the heat-expandable material enclosed therein expands in accordance with the temperature to be heated, and the protrusion of the output rod C1 gradually increases. According to the increase in the protrusion of the output rod C1, the transmission member D
And the starting valve V gradually moves downward to start the fuel passage 6.
2. The opening area of the starting air passage 63 and the starting air-fuel mixture passage 64 is gradually reduced, and the starting valve V closes and holds the passages 62, 63 and 64 in a state where the output rod C1 protrudes greatly.

Accordingly, by controlling the heat generated by the heater 68 in accordance with the warm-up operation characteristics of the engine, the temperature-sensitive driving member C is controlled.
, The opening position of the start valve V can be appropriately controlled by adjusting the protrusion of the output rod C1. Therefore, the mixture for warm-up operation appropriate for the warm-up operation of the engine is directed to the engine. It can be supplied, and a good warm-up operation after starting can be obtained.

At the end of the warm-up operation when the engine is sufficiently warmed up, the temperature-sensitive driving body C is sufficiently warmed up and the output rod C1 is held so as to protrude greatly.
Can close and hold the starting air passage 63, the starting fuel passage 62, and the starting air-fuel mixture passage 64, stop the supply of the air-fuel mixture from the starting air-fuel mixture passage 64, and thereby satisfactorily operate the engine thereafter.

[0008]

According to such a conventional automatic starter for a carburetor, when a cover holder 66 is screwed onto a female screw 65A of a wax holder 65, a heater having terminals 67A and 67B inside these is provided. The starting valve V attached to the collar 68, the collar 69, the temperature-sensitive driving body C, and the transmission member D is pressed by the second spring S <b> 2 and fixedly mounted. The work of setting the initial position of the starting valve V in a constant temperature state is performed by placing the wax holder 65, the cover holder 66, and the like in the assembled state under a constant temperature state.
Is adjusted by screwing the wax holder 65 so that the protrusion dimension Y between the lower end 65C of the start valve V and the lower end VB of the start valve V is constant. Thus, the initial position of the start valve V in a constant temperature state can be accurately set. . Then, the lower portion of the wax holder 65 in the assembled state is inserted and arranged in the wax holder insertion concave portion 60 of the base body A, and then the stay 70 is engaged with the groove 65B of the wax holder 65. Although it is screwed and fixed to the base body A, according to the above assembling method, the openings of the starting fuel passage 62, the starting mixture passage 64, and the starting air passage 63 at the initial position of the starting valve V are accurately set. Is difficult to do. This is because the opening / closing valve V mounted on the wax holder 65 and the cover holder 66 and the starting fuel passage 62 and the starting air-fuel mixture passage 64 formed in the base body A are respectively formed in different members, and they are assembled. This causes an error to occur. That is, it is due to an error in the groove width of the groove 65B formed in the wax holder 65, an error in the thickness of the stay 70, an error from the groove 65B to the lower end 65C of the wax holder 65, and the like.
Specifically, when the wax holder 65 is disposed slightly above the initial set position due to the error, the starting valve V tends to increase the openings of the starting fuel passage 62 and the starting mixture passage 64, and When it is arranged below, the opening tends to decrease.

On the outer periphery of the wax holder 65 and the cover holder 66, a heat-retaining cover 71 for keeping the temperature-sensitive driving member C warm is arranged. The heat-retaining cover 71 has an opening 71A through which a lead wire 72 passes. Is formed, it is difficult to form a closed space, and many man-hours for development are required to improve heat insulation.

Further, the starting mixture passage 64 is formed in the base body A.
Therefore, it is difficult to form the cross-sectional shape of the starting mixture passage 64 into a non-circular shape. That is, the starting mixture passage 64 formed in the base body A has a relatively long passage length, and the passage processing is performed by drilling in consideration of economy. According to the above,
The opening characteristic of the starting air-fuel mixture passage 64 with respect to the movement of the starting valve V in the opening direction is uniquely determined by the circular shape. Therefore, the degree of freedom in selecting the opening characteristic is low, and many development steps are required. Was.

Further, the large parts as the main body of the starting device require the wax holder 65, the cover holder 66, and the heat insulating cover 71, and the inexpensive automatic starting device is required with the increase in the number of parts and the number of assembling steps. Could not be provided.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and provides an automatic starting device capable of controlling the opening of the starting fuel passage 62, the starting mixture passage 64, and the starting air passage 63 by the starting valve V very accurately. A first object of the present invention is to provide, and another object is to improve the heat retaining property of a temperature-sensitive driving body. To improve the degree of freedom in selecting the opening characteristics of the starting mixture passage. To provide an inexpensive automatic starting device. It is in.

[0013]

In order to achieve the above object, an automatic starter for a carburetor according to the present invention displaces a start valve in synchronization with a temperature-sensitive drive member which is displaced in accordance with the heat generated by a heater. The opening of the starting air passage, the starting fuel passage, and the starting air-fuel mixture passage is controlled by the displacement of the starting valve, and the starting air-fuel mixture toward the starting air-fuel mixture passage is automatically controlled. A wax holder in which the temperature-sensitive driving member is housed and arranged in the member housing hole, and a start air passage, a start fuel passage, and a start air-fuel mixture passage that open in the start valve guide hole.
A starter main body B integrally formed with a valve body housing and disposing a start valve for controlling opening and closing according to the displacement of the temperature-sensitive driving member, a color member for positioning the temperature-sensitive driving member in the wax holder; A heater for heating the temperature-sensitive driving member, and a cover holder including a terminal electrically connected to the heater, and a valve body of the starting device body,
A first feature is that the base body is arranged and fixed to a valve body installation portion provided on the base body.

[0014] In addition to the first feature, the present invention further comprises a peripheral portion of the wax holder which is surrounded by a cylindrical portion provided on the cover holder with a gap therebetween. A second feature is that a substantially closed annular space portion is formed along the line.

According to a third aspect of the present invention, in addition to the second feature, at least a lower end of the wax holder is in contact with a cylindrical portion of the cover holder to form a substantially closed annular space. And

In addition, the present invention is characterized in that, in addition to the first feature, a cross-sectional shape of a starting air-fuel mixture passage formed in the valve body is made non-circular.

Further, in the present invention, in addition to the first feature, a fifth feature is that a starting device main body including the wax holder and the valve body is integrally formed of a synthetic resin material.

According to a sixth aspect of the present invention, in addition to the first feature, the valve body is formed in a substantially cylindrical shape, and is inserted and disposed in a valve body insertion recess formed in the base body.
The feature of.

Further, according to the present invention, in addition to the sixth feature, the cover holder is inserted and arranged toward the wax holder and abutted on the upper end of the collar to fix the cover holder toward the base body. This is the seventh feature.

Further, in the present invention, in addition to the seventh feature, an eighth embodiment is characterized in that a mounting stay is formed integrally with the cover holder, and the cover holder is screwed and fixed to the base body via the mounting stay. And

Further, according to the present invention, in addition to the first feature,
A ninth feature is that the collar is screwed to the upper opening of the wax holder.

[0022]

According to the first feature of the present invention, the starting device body is integrally formed by the wax holder and the valve body, and the temperature-sensitive driving member having the starting valve, the starting fuel passage, the starting air passage, and the starting air-fuel mixture passage are formed. Since all are housed and formed in a single starter body, the opening of the starting fuel passage, the starting air passage, and the starting air-fuel mixture passage with respect to the initial position of the starting valve including the temperature-sensitive driving member can be set very accurately. The starting air-fuel mixture can be supplied to the engine.

According to the second feature of the present invention, an annular space which is formed in a substantially hermetically closed state by the cylindrical portion of the cover holder is formed on the outer periphery of the wax holder, so that the heat retaining characteristics of the temperature-sensitive driving body can be improved. Thus, the hot restartability of the engine can be improved.

According to the third feature of the present invention, since the lower end of the wax holder is in contact with the cylindrical portion of the cover holder to form the annular space, the annular space can be easily formed in a sealed state, The heat retention of the temperature-sensitive driving body can be improved.

According to the fourth feature of the present invention, the starting mixture passage is formed in the valve body, and the distance between the outer periphery of the valve body and the starting valve guide hole can be made relatively short. A starting mixture passage having a non-circular cross-sectional shape can be easily formed by using a processing or molding method other than the processing,
The degree of freedom in selecting the opening characteristics of the starting mixture passage can be improved.

According to the fifth aspect of the present invention, since the starting device main body including the wax holder and the valve body is integrally formed of a synthetic resin material, the number of parts and assembly steps can be reduced, and the starting device main body can be reduced. Can be reduced in weight.

According to a sixth aspect of the present invention, a substantially cylindrical valve body is inserted and arranged in a valve body insertion recess formed in the base body.
The valve body and the valve body insertion recess can be easily formed.

According to a seventh feature of the present invention, the cover holder is disposed in contact with the collar screwed to the wax holder, and the starter body is fixed to the base member by fixing the cover holder toward the base member. Be placed.

According to an eighth aspect of the present invention, the cover holder is disposed in contact with the collar of the wax holder, and the cover holder is screwed and fixed to the base body via a mounting stay formed integrally with the cover holder. Thereby, the starting device main body is fixedly arranged on the base member.

According to a ninth aspect of the present invention, the position of the starting valve can be adjusted very simply and easily by screwing the collar, since the collar is arranged so as to be exposed upward.

[0031]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the automatic vaporizer starter according to the present invention will be described with reference to FIG. Note that the same components as those in FIG. B is a main body of the starting device, which is integrally formed by the wax holder F and the valve body G. The wax holder F has a bottomed cylindrical shape having an upper opening FA, and a temperature-sensitive driving member housing hole FC extending from the upper opening FA to the bottom FB inside the wax holder F.
Is drilled. A female screw is formed in the upper opening FA, and an annular flange FE extending outward is formed on the outer periphery of the lower end FD. The valve body G is formed in a cylindrical shape integrally protruding further downward from the lower end FD of the wax holder F, and has a temperature-sensitive driving member housing hole F inside.
The bottom GA from the bottom FB of C toward the inside of the valve body G
A start valve guide hole GB having a hole is formed. The starting fuel passage 10 is formed so as to open from the lower end GC of the valve body G to the bottom GA of the starting valve guide hole GB. The starting fuel passage 10 in this example was formed by a nozzle. A starting air passage 11 and a starting air-fuel mixture passage 12 are formed from the outside of the valve body G to the inside of the starting valve guide hole GB. That is, the starting fuel passage 10 is provided with the starting valve guide hole G.
Opening from the bottom GA of B to the lower end GC of the valve body G,
The start air passage 11 and the start air-fuel mixture passage 12 open from the inside of the start valve guide hole GB to the outside of the valve body G. 13A is fitted on the outside of the valve body G,
A first O-ring made of a rubber material disposed between the starting mixture passage 12 and a lower end GC of the valve body G;
B is a second O-ring made of a rubber material and fitted to the outside of the valve body G above the starting mixture passage 12.

D is a bottomed cup-shaped transmission member having an opening at the upper part of the cylindrical part D1 and having a bottom part D2. A projecting part is formed further below the bottom part D2 and faces upward at the lower end of the projecting part. A locking flange D3 is formed. A spring locking flange D4 is formed on the outer periphery near the upper end of the cylindrical portion D1.

The starting valve V provided with the needle N has a reduced step portion V1 facing downward and formed inside the upper portion thereof, and the locking flange D3 of the transmission member D is engaged with the reduced step portion V1 of the starting valve V. Then, the first spring S1 contracted and held therein abuts and holds the locking flange portion D3 toward the reduction step portion V1, whereby the starting valve V is integrally attached to the transmission member D.

A transmission member D integrally mounted with the starting valve V is inserted and arranged in the starting device main body B.
According to this, the starting valve V is inserted and arranged in the starting valve guide hole GB of the valve body G, and the transmission member D is arranged in the temperature-sensitive driving member housing hole FC of the wax holder F.
The spring locking flange D4 of the transmission member D and the storage hole FC
The second spring S2 is disposed between the second spring S2 and the bottom FB.

Next, the cylindrical portion D1 of the transmission member D in the above state.
The lower end of the output rod C1 is disposed in contact with the bottom D2 of the transmission member D.

Next, a cylindrical collar K is screwed into a female screw formed in the upper opening FA of the wax holder F, thereby closing the upper opening of the temperature-sensitive driving member housing hole FC. According to the above description, the transmission member D is pressed upward by the strong spring force of the second spring S2. According to this, the bottom portion D2 of the transmission member D is colored with the temperature-sensitive drive member C via the output rod C1. K, while the starting valve V is disposed in the starting valve guide hole GB, and thereby the temperature-sensitive driving member C having the starting valve V can be stored in the starting device body B. is there.

In such an assembled state, the initial positions of the start valve V with respect to the start air-fuel mixture passage 12, the start air passage 11, and the start fuel passage 10 are set as follows. First, the starting device main body B (not the entire device main body but at least the temperature-sensitive driving member C) in the assembled state is maintained at a constant temperature state, and is formed by the starting fuel passage 10 and the needle N in this state. The effective opening area of the starting fuel passage 10 or the effective opening area of the starting mixture passage 12 and the starting air passage 11 formed by the lower end V2 of the starting valve V is measured, and the collar K is screwed so that the openings have a predetermined value. adjust. For example, when the opening is smaller than a predetermined value, the temperature-sensitive driving member C including the starting valve V by changing the color K is used.
Can be moved upward to increase the opening. When the opening is larger than a predetermined value, the opening can be reduced by tightening the collar K and moving the starter valve V, thereby reducing the opening. It can be accurately adjusted to a predetermined value. Incidentally, the measurement of the effective opening area can be extremely easily performed using a normal fluid measuring instrument such as an air micrometer.

On the other hand, the base body A formed by either the vaporizer main body 1 or the float chamber main body 4 is provided with a valve body insertion recess A1 extending downward from the upper end thereof. The shape of A1 is a shape into which the valve body G can be inserted. A starting fuel passage A2 connected to the bottom of the valve insertion recess A1 below the fuel level of the float chamber 5 is opened, and starting air connected to the intake passage 2 upstream of the throttle valve 3 is provided at a side of the valve insertion recess A1. A passage A3 and a starting air-fuel mixture passage A4 connected to the intake passage 2 downstream of the throttle valve 3 are opened and formed. Although the throttle valve shown in the figure is a butterfly type, it may be a sliding valve. Further, a mounting flange portion A6 formed with a female screw A5 is formed on the base body A toward the upper side.

J is a cover holder consisting of: The cover holder J is a cylindrical part J having an upper bottom part J1.
2, a heater 13 which is electrically connected to and sandwiched between the terminals T1 and T2 is disposed on the upper bottom portion J1, and an end portion of the terminal protrudes into the terminal holder hole J3.
Further, the inner diameter of the cylindrical portion J2 extending in the vertical direction is larger than the diameter of the outer periphery FG of the wax holder F. In this example, the inner diameter of the cylindrical portion J2 is a diameter that comes into contact with the annular flange FE of the wax holder F. . Further, a mounting stay J4 is integrally formed from the cover holder J toward the side, and a mounting hole J5 facing a female screw A5 formed in the mounting flange A6 of the base member A is formed in the mounting stay J4. Is done.

The automatic starter is assembled as follows. First, the upper opening FA of the wax holder F
Is closed by a collar K, and a starting device body B in which a starting valve V, a transmission member D, and a temperature-sensitive driving member C are housed and arranged.
Is prepared, and the valve body G of the starter body B is inserted into the valve body insertion recess A1 of the base body A. Next, the cylindrical portion J2 of the cover holder J is placed so as to cover the wax holder F. According to this, the heater 13 sandwiched between the terminals T1 and T2 abuts on the upper end K1 of the collar K via the terminal T2. On the other hand, the cylindrical portion J2 of the wax holder F is arranged with a gap W surrounding the outer periphery FG of the wax holder F, and is disposed on the outer periphery FG of the wax holder F in the longitudinal direction X- An annular space P along X is formed. And
At this time, by contacting the inner periphery of the cylindrical portion J2 of the cover holder J with the outer periphery of the annular flange portion FE of the wax holder F, the annular space portion P can be formed in a substantially sealed shape.

In this state, a screw 15 is inserted into the mounting hole J5 of the mounting stay J4 of the cover holder J.
Is inserted and screwed toward the female screw A5 of the mounting flange A6 of the base body A. According to this, the cover holder J is fixed to the base body A, and the upper end K1 of the collar K of the wax holder F is covered. Heater 1 including terminals T1 and T2 arranged on upper bottom J1 of holder J
3, the starting device main body B is fixedly arranged on the base main body A, and the assembling of the automatic starting device is completed. At this time, the starting fuel passage 10 formed in the valve body G is connected to the base main body A. The starting air passage 11 formed in the valve body G is connected to the starting fuel passage A2 formed, and the starting air passage 11 formed in the valve body G is connected to the starting air passage A3 of the base body A. Is connected to the starting mixture passage A4 of the base body A.

The control of the starting air-fuel mixture at the time of starting the engine, at the time of warm-up operation, and at the time of completion of the warm-up operation is carried out in the same manner as in the prior art. Effects can be achieved.
First, when the starting device body B is mounted on the base body A, extremely accurate control of the starting air-fuel mixture can be performed. That is, the starting valve V having the needle N and the temperature-sensitive driving member C are disposed in the starting device main body B, and the starting fuel passage 10 and the starting fuel passage are provided in the starting valve guide hole GB of the valve body G forming the starting device main body B. By forming the air passage 11 and the starting air-fuel mixture passage 12, the starting valve V can be accurately arranged at a predetermined fixed position in a predetermined constant temperature state. Starting fuel passage 1 determined by needle N
The effective opening area of the starting mixer passage 12 and the starting air passage 11 determined by the effective opening area of 0 and the lower end V2 of the starting valve V can be accurately controlled. And the starting valve V
When the starting device main body B including the starting fuel passage 10, the starting air-fuel mixture passage 12, and the starting air passage 11 is mounted on the base main body A, even if the device main body B is vertically displaced, the starting valve V And the starting fuel passage 10, the starting air-fuel mixture passage 12, the starting air passage 1
1 does not change at all, it is possible to stably supply an extremely accurate start-up air-fuel mixture to the engine, to obtain a good startability of the engine, and to obtain harmful exhaust gas components. Emissions can be effectively suppressed. The starting fuel passage 10, the starting air-fuel mixture passage 12, and the starting air passage 11 formed in the starting device main body B, and the starting fuel passage A2, the starting air-fuel mixture passage A4, and the starting air passage A3 formed in the base main body A. Need only be connected, and the passages A2, A3, A4 formed in the base body A have no effect on the control of the starting air-fuel mixture.

Also, according to the fact that the starting air-fuel mixture passage 12 for directly controlling the starting air-fuel mixture amount is provided in the valve body G of the starter body B, the starting air-fuel mixture passage 12 is started from the outer periphery of the valve body G. It is formed in a straight line at a very short distance into the valve guide hole GB, so that the cross-sectional shape of the starting mixture passage 12 can be easily formed into a non-circular shape. An example of this non-circular shape is shown in FIGS.
It has a substantially triangular shape and a substantially elliptical shape shown in FIG. With such a non-circular shape, the supply of the starting air-fuel mixture with respect to the degree of opening of the starting valve V can be appropriately supplied in accordance with the request of the engine, and the startability can be further improved.

Focusing on the cover holder J, the cover holder J having a cup shape with a bottom is attached to the starting device body B.
Is formed by a gap W along the longitudinal direction XX of the temperature-sensitive driving member C between the outer periphery of the wax holder F and the inner periphery of the cylindrical portion J2 of the cover holder J. Since the closed annular space P was formed, the heat retention characteristics of the temperature-sensitive drive member C could be improved,
This improved the hot restartability of the engine. Then, the terminals T1 and T
According to the arrangement 2, even when a lead wire is attached to the terminal, the lead wire can be drawn directly to the outside without passing through the annular space P, and the annular space P is substantially It is preferable to form it hermetically. In addition, the cover holder J serves as a conventional heat retaining cover, and since a simple heat retaining cover is not required, the number of parts and the number of assembling steps can be reduced, which is preferable in reducing the manufacturing cost.

Also, according to the lower end of the cylindrical portion J2 of the cover holder abutting on the annular flange portion FE of the wax holder F, the lower end of the cylindrical portion J2 can be reliably closed by the annular flange portion FE. P can be hermetically formed without using another closing member.

The wax holder F and the valve body G
Is a shape that can be cast in the up, down, left and right directions, so that it can be integrally molded using a synthetic resin material. According to this, it is possible to achieve a reduction in parts cost and weight, and a wax holder using a metal material. As compared with the case where F was manufactured, the heat retaining property for the temperature-sensitive driving member C was improved.

Since the outer shape of the valve body G is not restricted at all, the valve body can be formed in a substantially cylindrical shape and can be inserted and arranged in a valve body insertion recess formed in the base body. As a result, the valve body G and the valve body insertion recess A1 can be easily formed, and the sealing of each passage can be easily performed.

Also, according to the arrangement of the collar K screwed into the upper opening FA of the wax holder F, the initial position of the starting valve V can be set by screwing the collar K. Since the collar K can be used without preparing any members, the adjustment of the start valve V can be facilitated and the increase in cost for the adjustment can be suppressed.

Further, according to the fact that the cover holder J is in contact with the upper end K1 of the collar K disposed on the upper end of the wax holder F and the cover holder J is fixed to the base main body A, the starting device main body B is connected to the base main body A. The starting device main body B can be fixed to the base main body A at low cost without preparing a special mounting member. At this time, the mounting stay J4 is integrally formed with the cover holder J, and the screw 15 is directed toward the female screw A5 formed on the mounting flange A6 of the base body A via the mounting hole J5 formed in the mounting stay J4. If it is screwed on, it can be mounted at a lower cost.

[0050]

As described above, according to the automatic starter for a carburetor according to the present invention, the automatic starter has a starter main body in which a wax holder having a temperature-sensitive drive member and a valve body having a starter valve are integrally formed. , Formed by a cover holder having a heater sandwiched between terminals, and the valve body of the starting device body is arranged and fixed at the valve body installation portion of the base body, so that an extremely accurate starting air-fuel mixture can be supplied to the engine. Startability can be improved. Also, according to the fact that the outer periphery of the wax holder is surrounded by a cylindrical portion provided on the cover holder with a gap, and the annular space portion that forms a substantially sealed shape along the longitudinal direction of the temperature-sensitive driving member is formed on the outer periphery of the wax holder. The heat retention characteristics of the temperature-sensitive driving body can be improved, and the hot startability of the engine can be improved. According to the above, at least the lower end of the wax holder is brought into contact with the cylindrical portion of the cover holder, so that the hermeticity of the annular space can be improved, and the heat retention of the temperature-sensitive driving body can be further improved.
In addition, according to the non-circular cross-sectional shape of the starting air-fuel mixture passage formed in the valve body, the supply characteristics of the starting air-fuel mixture can be accurately matched to the demands of the engine, thereby improving the startability of the engine. Can be further improved. In addition, since the starting device body including the wax holder and the valve body is integrally formed of a synthetic resin material, it is possible to improve the heat retaining property of the temperature-sensitive driving body and to reduce the manufacturing cost and reduce the weight. Further, the valve body and the insertion recess can be easily formed by forming the valve body into a substantially cylindrical shape and inserting the valve body into the insertion recess. In addition, the cover holder is inserted and placed toward the wax holder and is placed in contact with the upper end of the collar. According to the fact that the cover holder is fixed to the base body, the starter body can be easily attached to the base body. In addition, since the mounting stay is integrally formed with the cover holder and the cover holder is screwed and fixed to the base body via the mounting stay, the mounting of the cover holder to the base body is further facilitated. be able to. Furthermore, by screwing the collar to the upper opening of the wax holder, the position adjustment of the temperature-sensitive driving body and the opening / closing valve can be performed extremely easily, and the heat transfer function of the heater and the temperature-sensitive driving body can be shared.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view showing a main part of an embodiment of an automatic starter for a vaporizer according to the present invention.

FIG. 2 is a longitudinal sectional view of a starting air-fuel mixture passage in the automatic starter for a carburetor according to the present invention.

FIG. 3 is a longitudinal sectional view of a main part of a conventional automatic starter for a vaporizer.

[Explanation of symbols]

 Reference Signs List A base member B starting device main body C temperature-sensitive driving member F wax holder FA upper opening G valve body J cover holder J2 cylinder part P annular space W gap K color 10 starting fuel passage 11 starting air passage 12 starting mixed air passage 13 heater

Claims (9)

[Claims] A starting valve is displaced in synchronization with a temperature-sensitive driving member that is displaced in response to heat generated by a heater, and the displacement of the starting valve controls the opening of a starting air passage, a starting fuel passage, and a starting air-fuel mixture passage. A wax holder-F in which a temperature-sensitive driving member C is housed and arranged in a temperature-sensitive driving member housing hole FC, in an automatic starting device of a vaporizer in which a starting air-fuel mixture heading toward a starting air-fuel mixture passage is automatically controlled; A valve body G that houses and arranges a start valve V that controls opening and closing of the start air passage 11, the start fuel passage 10, and the start air-fuel mixture passage 12 that open in the start valve guide hole GB in accordance with the displacement of the temperature-sensitive driving member C; , A color member K for positioning the temperature-sensitive driving member C in the wax holder F, a heater 13 for heating the temperature-sensitive driving member C, and an electric connection to the heater 13. Terminal T1 , T2 and cover holder J
And a valve body G of the starting device body is attached to a base.
An automatic starting device for a vaporizer, wherein the automatic starting device is arranged and fixed at a valve body installation portion A1 provided on a main body A of the engine. 2. The outer periphery FG of the wax holder is surrounded by a cylindrical portion J2 provided on the cover holder J with a gap W, and the outer periphery of the wax holder J is substantially along the longitudinal direction XX of the temperature-sensitive driving member C. Annular space P forming a closed shape
The automatic starting device for a carburetor according to claim 1, wherein: 3. A substantially closed annular space P is formed by contacting at least a lower end FD of the wax holder with a cylindrical portion J2 of the cover holder J.
An automatic starter for the vaporizer as described. 4. The automatic starting device for a carburetor according to claim 1, wherein the cross-sectional shape of the starting mixture passage formed in the valve body is non-circular. 5. The wax holder and the valve body G.
The automatic starting device for a carburetor according to claim 1, wherein the starting device main body B is integrally formed of a synthetic resin material. 6. A valve body insertion recess A formed in the base body A by forming the valve body G into a substantially cylindrical shape.
2. The automatic starting device for a carburetor according to claim 1, wherein the automatic starting device is inserted and disposed in the inside. 7. The cover holder is inserted and arranged toward a wax holder F and has an upper end K of a collar K.
7. The automatic starter for a vaporizer according to claim 6, wherein the cover holder J is fixed to the base body A so as to be in contact with the base body A. 8. A stay J4 attached to the cover holder.
Are integrally formed, and the cover holder J is attached to the stay J4.
8. The automatic starting device for a carburetor according to claim 7, wherein the automatic starting device is screwed and fixed to the base body A via the base. 9. The automatic starting device for a vaporizer according to claim 1, wherein the collar is screwed to an upper opening FA of the wax holder F.