JP3367035B2 - Engine auto choke device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of an auto choke device used for engines of motorcycles, scooters, automobiles and the like.

[0002]

2. Description of the Related Art An engine in which gasoline is mainly used as fuel, and fuel and air are mixed at a predetermined mixing ratio by a carburetor attached to the engine and supplied into a cylinder, has a good startability on a cold morning. In order to do so, many are equipped with an auto choke device. This auto choke device opens the bypass air passage with the starter valve and the auxiliary fuel passage with the needle valve to improve the ignitability of the mixture of fuel and air in the cylinder when the engine temperature is low. This is for further supplying fuel to the air-fuel mixture flowing through the air-fuel mixture passage to increase the fuel concentration. Then, when warm-up operation is performed and the engine temperature rises above a certain level, the bypass air passage and the auxiliary fuel passage are closed by the starter valve and the needle valve, and the fuel concentration of the air-fuel mixture is automatically returned to normal.

An outline of a conventional general auto choke device 34 that performs such an operation will be described with reference to FIG.
Is a carburetor body, 21 is a main air passage, 22 is a bypass air passage that bypasses the main air passage 21, 23 is a throttle valve provided in the main air passage 21, 24 is an auxiliary fuel passage that communicates with the bypass air passage 22, Numerals 25 and 26 are starter valves constituting an auto choke device which automatically opens the bypass air passage 22 and the auxiliary fuel passage 24 which constitute the carburetor when the engine temperature is low and closes them when the engine temperature rises. And the needle valve. The main fuel passage provided in the main air passage 21 is not shown in FIG.

The starter valve 25 and the needle valve 26
Is attached to the tip of a moving member 28 that is pushed by a piston 27a that constitutes the thermoelement 27, and the thermoelement 27 and the moving member 28 are housed in a case 29. Reference numeral 30 is a return spring that pushes back the moving member 28, 31 is a thermistor which is a heating element that is heated by energization and has a large electric resistance by heating, and this thermistor 31 is built in the thermoelement 27 and expands the piston 27a by thermal expansion. It is disposed in contact with the extruded thermal expansion body side. Reference numeral 32 is a wiring connected to the thermistor 31, and a connector 33 attached to the tip of the wiring is connected to an electric circuit (not shown).

Further, as an improvement of the auto starter device for this type of engine, Japanese Patent Application No. 6-3 filed by the applicant of the present application.
No. 0239 (Japanese Patent Laid-Open No. 7-238868).
As shown in FIG. 10, the auto starter device for this engine has a thermal expansion body 7 that expands and contracts due to a change in external temperature.
d is built in one part, and the thermoelement 7 for advancing and retracting the piston 7b provided in the other part by expansion and contraction of the thermal expansion body 7d, and the thermoelement 7 for forcibly moving the piston 7b The heating element 5 is provided on one side, and when the engine is started, the heating element 5 is energized to generate heat, and the piston 7b is moved to thereby connect the bypass air passage and the auxiliary fuel passage to the starter valve and the needle valve. In an auto starter device that is closed by and to automatically return the fuel concentration of the air-fuel mixture to normal, the thermo element 7 is held at the inner wall of the case body 1 of the auto starter device and at a predetermined position in the case body 1. A gap 6 is provided between the outer wall of the holder 2 and the heat insulating material filled with air or liquid or solid. It is intended to.

Further, in FIG. 10, 1a is an end opening of the case body 1 formed in an L shape, 1b is the other end opening of the same, and 2a is an inner circumference of the one end opening 1a. A screw portion formed on the outer circumference of the holder 2 so as to be screwed into the formed screw portion 1c, and 7c is a holding portion for holding the thermoelement 7. The tip of the piston 7b projects from the end of the piston guide 7a,
A pressing body 3 slidably fitted in a through hole of the holder 2 is slidably fitted, and a starter 3a of the pressing body 3 for opening and closing a bypass air passage of a main air passage. A valve is attached, and a needle valve for opening and closing an auxiliary fuel passage communicating with the bypass air passage is attached to the tip of the starter valve.

The pressing body 3 is a coil spring 8
Is always urged from the holder 2 in the retracting direction. Reference numeral 9 denotes a housing holder for the heat generating element 5, 10 is a connecting terminal connected to the heat generating element 5, 11 is a sealing member that penetrates the wiring 12 connected to the connecting terminal 10 with a sealing property, and the sealing member 11 Is fitted into the other end opening 1b of the case body 1. Reference numeral 13 is a protective tube that protects the wiring 12, 4 is an O-ring for fitting the thermoelement 7 into the holder 2 in a sealed state, and 11b is a rigid core material embedded in the pressing portion of the sealing member 11. is there.

[0008]

In the engine auto-starter device as shown in FIG. 10, since the thermoelements 7 and the heating elements 5 are arranged in the vertical direction in the vertical direction, the vertical dimension is increased. However, in a motorcycle or scooter in which automobile parts must be arranged at high density, there is a problem that a large space for arranging the auto starter device must be secured.

According to the present invention, a heating element for heating the thermal expansion body of the thermoelement is arranged on the side of the thermoelement, and the heat of the heating element is transferred to the thermal expansion body at one part of the thermoelement. The purpose is to provide a heat transfer plate to lower the auto choke device.

[0010]

In order to solve the above-mentioned problems, the invention according to claim 1 is characterized in that the case body 1 is laterally independent.
Stand up to form the first storage part 1 ₁ and the second storage part 1 ₂ .
In addition to this, the first storage unit 1 ₁ and the second storage unit 1 ₂
A heat transfer plate 14 that communicates with the first storage unit 1 ₁ is provided.
Thermal expansion body having thermoelement 7 on one side thereof
The 7d part is brought into contact with the one part 14a of the heat transfer plate 14 to store the 7d part.
Then , one electrode of the heating element 5 is placed in the second storage portion 1 _2.
The surface 5a is brought into contact with the other portion 14b of the heat transfer plate 14 to collect the heat.
The other electrode surface 5b of the heating element 5 and the heat transfer plate 14
When the wirings 12 and 12 for energizing the direction part 14b are connected together,
To, and seal the second housing portion 1 _2, wherein Samoereme
The piston 7b on the other side of the thermal expansion body 7
of the piston 7b which moves back and forth due to the expansion and contraction of d
Starter valve 25 and needle valve 26 that move with movement
The engine auto-chi
It is a fork device.

According to a second aspect of the present invention, there is provided the second aspect.
The heating element 5 when stored in the storage unit 1 _2, the heating element
A protrusion 16 is provided at a position where the peripheral edge of the child 5 comes into contact with the second storage member.
The part 1 ₂ ) according to claim 1, characterized in that
This is an auto choke device for the engine.

Further, the invention according to claim 3 is the heat generating element.
The other electrode surface 5b of the child 5 and the other portion 14b of the heat transfer plate 14 are connected to each other.
A structure in which the electric wirings 12, 12 are connected with hermeticity
Is the end opening of the _second housing 1 ₂ for housing the heating element.
Penetrates the sealing member 11 that seals the mouth 1b with sealing property
Connection terminals having spring properties at the ends of the wirings 12, 12.
10 and 10 are connected, and one of the connection terminals is connected to the heating element.
Of one the other electrode surface 5b second child 5 of the housing section 1 ₂
Between the wall 1 ₂ a, the other of the heat transfer plate 14 and the other connection terminal
The other surface 14b of the square portion 14b "second housing portion 1 ₂ of the other
These connecting ends when inserted between the inner wall 1 ₂ b and
In the projection 15 or the recess 15 'on the inner wall of the space in which the child is inserted
Characterized by being configured so that it cannot be pulled out easily by locking
The engine auto choke device according to claim 1.
It is what

The invention according to claim 4 has a spring property.
One of the connection terminals 10 is connected to the other electrode surface 5b of the heating element 5.
And insert connection between the inner wall 1 ₂ a of the second storage part 1 ₂ and the second storage part 1 ₂
Is formed on the back surface of the one connection terminal 10.
The heating element holding claw 10a holds the heating element 5 and
The connection terminal 10 and the heating element 5 of the
The pole surface 5a is connected to the other portion 14b of the heat transfer plate 14 by a connecting terminal.
10 is brought into contact with one of the inner walls 1 ₂ a of the second storage portion 1 _2.
When this connection terminal 10 is inserted, the empty
It can be easily pulled out by engaging with the projection 15 or recess 15 'on the inner wall.
Claim 1 characterized in that it is constructed so that it cannot be removed.
It is an auto choke device for the engine described.
It

The invention according to claim 5 opens downward.
Inside the case body 1 to speak, the thermo element 7 and this
The heating element 5 is arranged on the side of the thermoelement 7
Heat having the heat of the thermal element 5 on one side of the thermoelement 7
A heat transfer plate 14 for transferring heat to the expander 7d is provided,
The one electrode surface 5a of the heat element 5 is connected to the other portion 14 of the heat transfer plate 14.
b, the other electrode surface 5b of the heating element 5
And the wirings 12, 1 for energizing the other part 14b of the heat transfer plate 14
2 is connected and the downward opening is sealed,
It has a piston 7b on the other side of the thermoelement 7,
The thermal expansion body 7d expands and contracts to move back and forth.
Starter valve 25 that moves with the movement of stone 7b
Engine characterized by being configured with an idle valve 26
This is an automatic choke device.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of an engine auto choke device according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a partial vertical cross-sectional view of the auto choke device, FIG. 2 is a vertical cross-sectional view of the auto choke device before assembly, and FIG. 3 is a vertical cross-sectional view of a case body having a heat transfer plate according to another embodiment. FIG. 4 is a bottom view of the case main body, FIG. 5 is a bottom view of the case main body of another embodiment, and FIG. 6 is a vertical cross-sectional view of the case main body including a heat transfer plate of another embodiment.

[0016] In these drawings, 1 is made of synthetic resin case body, a 1 _1, 1 ₂ the first and second housing portion formed independently laterally to the case body 1, these
Downward end for storing each member described later in the storage part of
Part openings 1a and 1b are provided. Reference numeral 14 denotes a heat transfer plate which is disposed by being molded in a part of the case body 1 so as to communicate with the first storage part 1 ₁ and the second storage part 1 _2, and is, for example, copper, brass, aluminum or stainless steel. , A conductive metal member such as iron, having a desired thickness (for example, a thickness of 0.5 mm to
Several millimeters), one part 14a of which is exposed to the top surface in the figure of the _first storage part 1 ₁ , and the other part 14b is almost from the central part of the top surface of the _second storage part 1 _2. Exposed vertically.

[0017] 2 is a holder for accommodating and holding the thermo-element 7 in the first housing portion 1 _1, the threaded portion 2a formed in one portion of the holder 2, the first housing portion 1 ₁ of the end opening It is adapted to be screwed into a screw portion 1c formed in 1a so that the thermoelement 7 is housed and held in the _first housing portion 1 ₁ of the case body 1 as described later. Reference numeral 3 denotes a pressing body which is slidably fitted to the outer circumference of the piston guide 7a of the thermoelement 7 and is pushed by the piston 7b of the thermoelement 7. The pressing body 3 has a tip portion 3a of the pressing body 3 as shown in FIG. A starter valve 25 for opening and closing the bypass air passage 22 and a needle valve 25 for opening and closing the auxiliary fuel passage 24.
(See FIG. 9). Reference numeral 8 is a coil spring 8 interposed between the pressing body 3 and the holder 2, and serves to push back the pressing body 3 and the piston 7b. 7d is a thermal expansion body built in one part 7e of the thermoelement 7,
f is a fluid filled in the piston guide 7a via the diaphragm 7g between the thermal expansion body 7d and 7h is a rubber piston inserted between the fluid 7f and the piston 7b.

In order to store and hold the thermoelement 7 in the _first storage portion 1 ₁ formed in the case body 1, first,
The outer periphery of the first housing section 1 one portion 7e thermal expansion member 7d is built in ₁ accommodating the thermoelement 7 so as to be in contact with the one portion 14a of the heat transfer plate 14, then the piston guide 7a Then, the pressing body 3 having the starter valve 25 and the needle valve 25 attached to one side 3a is fitted, and then the one end 8a is brought into contact with the flange 3b formed on the other side of the pressing body 3 to press the coil spring 8. The other end 8b of the coil spring 8 is fitted to the body 3, and the other end 8b of the coil spring 8 is brought into contact with the inner peripheral step portion 2b of the holder 2 to form a screw portion 2a formed on the outer periphery of one portion of the holder 2.
And it is adapted to receive hold screwed into the first housing portion 1 ₁ of the end screw portion 1c which is formed in the opening 1a.
When assembled in this manner, the starter valve 25 and the needle valve 25 attached to the one part 3a of the pressing body 3 project from the opening of the other part of the holder 2. As shown in FIG. 3, when receiving the first housing portion 1 thermoelement 7 to _1, such that the tip and the outer peripheral portion of the one portion 7e thermal expansion member 7d is built abuts, Den The one part 14a 'of the heating plate 14 may be formed in a dish shape.

Reference numerals 17 and 17 denote one surface 14b 'of the other portion 14b of the heat transfer plate 14 exposed in the second storage portion 12 and the _second portion 14b'.
Between the inner wall 1 ₂ a one of the storage unit 1 _2, in the projection of performing accommodating positioning of the heating element 5 housed in the meantime, the interval during which one of the connection terminals 10 having a spring property to be described later is inserted Protrusions 15 and 15 (see FIG. 4) or recesses 15 ', which are formed to face each other and to which the connection terminals 10 inserted as will be described later are locked to the opposing surfaces of the protrusions 17 and 17 to prevent the protrusions 15 and 17 from coming off. 15 '(see FIG. 5) is formed. 16
Is a projection with which a part of the contact surface of the peripheral portion of the heating element 5 housed between the one surface 14b 'of the other portion 14b of the heat transfer plate 14 and the projections 17, 17 comes into contact. The other connection terminal 10 having a spring property between the other surface 14b "and the second of the other housing portion 1 ₂ of the inner wall 1 ₂ b of the other portion 14b of the heat transfer plate 14
Is formed, and the connection terminals 10 inserted in the space are locked to prevent the connection terminals 10 from coming off.
(See FIG. 4) or recesses 15 ', 15' (see FIG. 5) are formed. As the connection terminal 10 having a spring property, a metal plate may be bent into a U or V shape and side pieces 10b and 10b may be bent and formed as shown in FIG. A coil for pressing a metal flat plate-shaped connection terminal so as to come into contact with the other electrode surface 5b of the heating element 5 or come into contact with the other surface 14b ″ of the other portion 14b of the heat transfer plate 14 It may be provided with a spring.

[0020] The manner in the second housing portion 1 a surface 14b of the ₂ to the other portion 14b of the heat transfer plate 14 formed 'and the second housing portion 1 ₂ of one inner wall 1 ₂ projections 17 formed on a, The heating element 5 is housed between the heating element 5 and the tip of the heating element 17. Then, the one electrode surface 5a of the heating element 5 contacts the one surface 14b 'of the other portion 14b of the heat transfer plate 14, and a part of the contact surface of the peripheral edge portion of the heating element 5 contacts the projection 16. Then, the projection and the other electrode surface 5b and the second one inner wall 1 ₂ a of the housing portion 1 ₂ of the heat generating element 5 1
When one of the connection terminals 10 (see FIG. 7) connected to the tips of the wirings 12, 12 penetrating the sealing member 11 in a sealing manner is inserted into the space between the connection terminals 10 and 7, Is the other electrode surface 5b of the heating element 5 and the second storage portion 1 ₂
While in the inner wall 1 ₂ a and a contact of the presses an electrode surface 5a of the heat generating element 5 on one surface 14b 'of the other portion 14b of the heat transfer plate 14.

As described above, since the protrusion 16 with which a part of the contact surface of the peripheral portion of the heating element 5 abuts is formed in the _second accommodating portion 12, the peripheral portion of the heating element 5 abuts. Since a part of the surface comes into contact with the protrusion 16, the contact resistance is reduced, and the heating element 5 is attached to the one surface 14 of the other portion 14b of the heat transfer plate 14.
It becomes easy to move in the direction of b ', and the one electrode surface 5 of the heating element 5
The contact between a and the one surface 14b 'of the other portion 14b of the heat transfer plate 14 is performed more reliably. In addition, the side pieces 10b, 10b of the one connection terminal 10 inserted as described above are the protrusions 1
5, 15 or the concave portions 15 ', 15' are engaged and prevented from coming off. If the above-mentioned protrusion is not formed in the second storage portion, when the second storage portion is made of synthetic resin, the inner corner of the second storage portion is not formed at a right angle and the roundness is not formed. If the corners of the peripheral portion of the heating element come into contact with the rounded portion, the contact surface of the peripheral portion of the heating element housed in the second storage portion becomes the contact surface of the storage portion. Since it does not completely adhere to and tilts, one electrode surface of the heating element tilts away from one surface of one part of the heat transfer plate, and the heat of the heating element is not completely transferred to the other part of the heat transfer plate. However, poor contact may occur.

Further, the other connection terminal 10 (see FIG. 7) connected to the tips of the wirings 12, 12 penetrating the sealing member 11 in a hermetically sealed manner is attached to the other surface 14b of the other portion 14b of the heat transfer plate 14. "and when inserted into the space between the second housing portion 1 ₂ of the other inner wall 1 ₂ b, and the other connection terminal 10 and the second housing portion 1 ₂ of the other inner wall 1 ₂ b By being pressed against the other surface 14b ″ of the other portion 14b of the heat transfer plate 14, the connection terminal 10 on the other side and the other portion 14b of the heat transfer plate 14 are more reliably connected. Further, the side pieces 10b, 10b of the other connecting terminal 10 inserted as described above are locked to the projections 15, 15 or the recesses 15 ', 15' to prevent the side pieces 10b, 10b from coming off. After this manner connection of the two connection terminals 10 and 10 is completed, the sealing covering section member 11 is press-fitted to the second housing portion 1 ₂ of the end opening 1b to seal the end opening 1b.

FIG. 6 shows another embodiment in which the other connecting terminal is connected to the other portion 14b of the heat transfer plate 14, and a plug-like portion 14c is formed at the tip of the other portion 14b of the heat transfer plate 14. Then, the plug-shaped portion 14c is adapted to be fitted and connected to the socket-shaped connection terminal 10 'attached to the tip of the wiring 12. With such a connection terminal connection structure, the connection terminal 10 'does not need to have a structure having a spring property, so that it is possible to reduce the number of parts and the lateral dimension of the auto choke device.

Reference numeral 14d designates the other portion 1 of the heat transfer plate 14.
4b is a spring piece formed by cutting and raising in the direction of the accommodated heat generating element 5 at the portion where the heat generating element 5 abuts, and the one electrode surface 5 of the heat generating element 5 accommodated by this spring piece 14d.
The contact between a and the other portion 14b of the heat transfer plate 14 is ensured.

In FIG. 8, one connection terminal 10 is connected to one electrode surface 5
FIG. 3 shows another embodiment in which a is connected to the other electrode surface 5b of the heat generating element 5 that is in contact with the other portion 14b of the heat transfer plate 14, in which the connection terminal 10 connected to the tip of one wiring 12 is connected. The heating element 5 is held by, for example, four heating element holding claws 10a formed on the back surface, and the connection terminal 10 and the heating element 5 are connected to the heat transfer plate 14 with one electrode surface 5a of the heating element 5.
The one face 14b of the other portion 14b ', when the connecting terminal 10 is inserted is brought into contact with the second housing portion 1 ₂ of one inner wall 1 ₂ a, the protruding side piece 10b of the connecting terminal 10 is 1
5, 15 or recesses 15 ', 15' are connected so that they cannot be easily removed. Further, since the heating element 5 is held by a heating element holding claws 10a back to form the example of the four connection terminals 10, so that the heating element 5 does not fall off from the second housing portion 1 _2, and more Securely retained.

[0026]

According to the invention of claim 1 , the case book
A first storage portion and a second storage portion that are laterally independent of each other
And the first storage part and the second storage part.
A heat transfer plate that communicates with the
Of the thermal expansion body part having the element
The plate is brought into contact with one part of the plate to be stored, and is then placed in the second storage part.
Make one electrode surface of the heating element contact the other side of the heat transfer plate.
And the other electrode surface of the heating element and the other part of the heat transfer plate.
Connect the wiring that energizes to the
Seal and have a piston on the other side of the thermoelement.
The thermal expansion body expands and contracts to move back and forth.
Sutatabaru parts and needle that moves along with the movement of the piston
As an engine auto choke device that is configured with a valve
In other words, the case body is
-The first storage part for storing the thermoelement and the thermoelectric element
The second heating element that heats the thermal expansion body of the
By forming the storage part, the thermoelement
Needle and Needle that move with the movement of the piston
Valve communicates with the air passage and fuel passage of the carburetor.
Therefore, in the conventional example, the thermoelement and this heat
The electrical part of the heating element that heats the expansion body is
Since they are stored in the same storage part, the thermoelement
Completely sealed and stored in the storage section via an O-ring
Although it was necessary, in the present invention, the thermoelement
A first storage portion for storing a heat-generating element and a second storage portion for storing a heating element
Since it is completely independent of the storage part of
When storing the thermoelement in the
The component must be completely sealed in the above-mentioned storage section via an O-ring.
I no longer need it. As a result, the number of parts and the assembly
The number has been reduced and manufacturing costs have been reduced.

Further , as in the invention according to claim 1, heat is generated.
The heat of the element is transferred through the heat transfer plate to the thermal expansion body of the thermoelement.
This heat transfer plate is configured to transfer heat to
The amount of metal that receives heat from the heating element increases
As it increases and the heat retention improves, please stop the engine.
The engine is still warm when bypassing
Connect the air passage and auxiliary fuel passage to the starter valve and the need.
The thermal expansion of the thermo element
The temperature of the tension body cools and contracts, bypass air passages and auxiliary
Open the fuel passage with the starter valve and the needle valve.
This has the advantage of eliminating malfunctions.

Further , according to the invention of claim 2,
When the heating element is stored in the second storage portion, the heating element
Form a protrusion on the second storage part at the position where the peripheral edge of the child contacts.
By doing so, the contact surface of the peripheral portion of the heating element is
Part of it abuts the protrusions, reducing contact resistance.
Transfers heat to one electrode surface of the heating element housed in the second housing
The mobility that makes contact with one surface of one side of the plate is improved,
Make sure that the one electrode surface of the heating element is closely packed on one surface of the heat transfer plate.
In contact with each other, and has good electrical contact and thermal conductivity .
Become.

According to the third aspect of the invention, the structure in which the wiring for energizing the other electrode surface of the heating element and the other part of the heat transfer plate are connected with a hermetically sealing property is A connection terminal having a spring property is connected to the tip of the wiring penetrating with a sealing property to a sealing member that seals the end opening of the housing portion of No. 2, and one of the connection terminals is connected to the other electrode surface of the heating element. When the other connecting terminal is inserted between the other surface of the other portion of the heat transfer plate and the other inner wall of the second storage portion. Since these connection terminals are locked to the protrusions formed on the inner wall of the inserted space so that they cannot be easily pulled out, there is an advantage that the connection terminals will not come off due to vibration or the like.

According to the invention of claim 4, one of the connection terminals having a spring property is inserted and connected between the other electrode surface of the heating element and the one inner wall of the second accommodating portion. ,
The heating element is held by a plurality of heating element holding claws formed on the back surface of the one connection terminal, and the connection terminal and the heating element are connected to one electrode surface of the heating element to the other portion of the heat transfer plate. When the terminal is inserted in contact with one of the inner walls of the second housing portion and inserted, the connection terminal is locked to the protrusion of the inner wall of the space where it cannot be easily removed. The connecting terminal is never disengaged due to vibration when the vehicle is running, and since the heating element is held by a plurality of heating element holding claws formed on the back surface of the connecting terminal, the heating element and the connecting terminal Can be stored together in the second storage portion at the same time, so that the number of assembling steps can be reduced, and moreover, the heat generating element can be held more securely so as not to fall off from the second storage portion.

[Brief description of drawings]

FIG. 1 is a partial vertical sectional view of an auto choke device of the present invention.

FIG. 2 is a vertical sectional view of the auto choke device of the present invention before assembly.

FIG. 3 is a vertical cross-sectional view of a case main body including a heat transfer plate of another embodiment constituting the auto choke device of the present invention.

FIG. 4 is a bottom view of a case body that constitutes the auto choke device of the present invention.

FIG. 5 is a bottom view of a case body according to another embodiment of the auto choke device of the present invention.

FIG. 6 is a vertical cross-sectional view of a case main body including a heat transfer plate according to still another embodiment of the auto choke device of the present invention.

FIG. 7 is a perspective view of a connection terminal for energizing a heating element of the auto choke device of the present invention.

FIG. 8 is a perspective view of a connection terminal of another embodiment for energizing the heating element of the auto choke device of the present invention.

FIG. 9 is a schematic diagram of a conventional general engine auto choke device.

FIG. 10 is a vertical cross-sectional view of a prior art engine auto choke device.

[Explanation of symbols]

1 case body 1a one end opening 1b other end opening 1c screw part 1 ₁ first storage part 1 ₂ second storage part 1 ₂ a one inner wall 1 ₂ b other inner wall 2 holder 2a screw part 2b Inner peripheral step portion 3 Pressing body 3a Tip portion 3b Collar 4 O-ring 5 Heating element 5a One electrode surface 5b Other electrode surface 6 Gap 7 Thermoelement 7a Piston guide 7b Piston 7c Thermoelement holding portion 7d Thermal expansion body 7e One end portion 7f Fluid 7g Diaphragm 7h Rubber piston 8 Coil spring 9 Heater element storage holder 10 Connection terminal 10 'Connection terminal 10a Heater element holding claw 10b Side piece 11 Sealing member 11b Rigid core material 12 Wiring 13 Protective tube 14 Heat transfer plate 14a One part 14a 'One part 14b Other part 14b' One surface 14b "Other surface 14c Plug-like part 15 Projection 15 'Recess 16 Projection 17 Projection 0 carburetor body 21 main air passage 22 bypass air passage 23 throttle valve 24 auxiliary fuel passageway 25 starter valve 26 needle valve 27 the thermo-element 27a piston 28 moves member 29 case 30 return spring 31 thermistor 32 wiring 33 connector 34 automatic choke apparatus

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) F02M 1/04 F02M 1/12

Claims (5)

(57) [Claims] 1. A case body (1) having a first laterally independent member.
A heat transfer plate (1 ₁ ) and a second storage part (1 ₂ ) for communicating with the first storage part (1 ₁ ) and the second storage part (1 ₂ ). 14) is provided, and the first
The heat transfer plate (14) is provided with a thermo-element (7) in the storage part (1 ₁ ) of the
One of the electrode surfaces (5a) of the heating element (5) is stored in the second storage portion (1 ₂ ) by abutting against one of the portions (14a).
Is brought into contact with the other part (14b) of the heat transfer plate (14) to be housed therein, and the other electrode surface (5b) of the heating element (5) and the other part (14b) of the heat transfer plate (14) are accommodated. Wiring to energize (1
With connecting 2,12), said second housing portion 1 ₂ is sealed, said having a piston (7b) at the other end of the thermoelement (7), expansion and contraction of the thermal expansion member (7d) An auto choke device for an engine, comprising a starter valve (25) and a needle valve (26) that move in accordance with the movement of the piston (7b) that moves forward and backward. A heating element (5) when housed in claim 2 wherein said second housing part (1 _2), a projection at a position where the periphery is in contact of the heating element (5) (16), the second The engine auto choke device according to claim 1, wherein the auto choke device is formed in the storage portion (1 ₂ ). 3. A structure in which wirings (12, 12) for energizing the other electrode surface (5b) of the heating element (5) and the other portion (14b) of the heat transfer plate (14) are hermetically connected to each other. A spring is attached to the tip of the wiring (12, 12) which is hermetically penetrated through the sealing member (11) for sealing the end opening (1b) of the second storage portion (1 ₂ ) for storing the heating element. Of the heat generating element (5) and the other electrode surface (5b) of the heating element (5) and one of the _second accommodating portion (1 ₂ ) are connected. The other connecting terminal (10) is provided between the inner wall (1 ₂ a) and the other surface (14b ″) of the other part (14b) of the heat transfer plate (14) and the second storage part (1 ₂ ). Of the inner wall (1 ₂ b) of the other side of the inner wall (1 ₂ b), the protrusion (1
5. The automatic choke device for an engine according to claim 1, wherein the automatic choke device is configured so as to be locked in the recess 5) or the recess (15 ') so as not to be easily removed. 4. One connection terminal (10) having a spring property.
Is inserted and connected between the other electrode surface (5b) of the heat generating element (5) and one inner wall (1 ₂ a) of the second accommodating portion (1 ₂ ) in the connection terminal (10). The heating element (5) is held by the heating element holding claw (10a) formed on the back surface of the heating element (5), and the connection terminal (10) and the heating element (5) are connected to the one electrode surface (5a) of the heating element (5). The heat transfer plate (14)
The other part of (14b), when the connection pin (10) is inserted is brought into contact with one inner wall (1 ₂ a) of the second housing part (1 _2), the connection terminal (10) 2. The auto choke device for an engine according to claim 1, wherein the auto choke device according to claim 1, wherein the auto choke device is configured so as to be locked to a projection (15) or a recess (15 ') on an inner wall of the inserted space so as not to be easily pulled out. 5. A case main body (1) having a downward opening,
Thermoelement (7) and this thermoelement (7)
A heating element (5) is arranged on the side of the
Expansion of the heat of the thermoelement (7) on one side
A heat transfer plate (14) for transferring heat to the body (7d) is provided, and
The one electrode surface (5a) of the heating element (5) is connected to the heat transfer plate (1).
The other side (14b) of 4) is brought into contact with the other part (14b) to be housed, and the heat generated
The other electrode surface (5b) of the element (5) and the other of the heat transfer plate (14)
Connect the wiring (12, 12) that conducts electricity to the part (14b)
At the same time, seal the downward opening to
The piston (7b) on the other side of the
The forward and backward movement due to expansion and contraction of the thermal expansion body (7d)
Starter valve that moves with the movement of piston (7b)
An auto choke device for an engine, comprising: (25) and a needle valve (26) .