JPS5985462A - Thermosensitive device - Google Patents

Abstract

PURPOSE:To enable a piston and a retainer to move back and forth together in an automobile carburetor, by providing an elastic material between a cover and the retainer, which moves forth together with the piston under the force of the expansion of a thermally expanded substance. CONSTITUTION:When a thermally expanded substance 11 is expanded due to the warm-up of an engine, a film 9 is curved toward a main body 1 to protrude a piston 8 from a guide 3 through the action of a semifluid 5, an auxiliary piston 6 and a separating plate 7. At the same time, a retainer 12 also moves forth together with the piston 8 against the force of an elastic material 17 interposed between a cover 16 and the retainer to operate a choke. When the thermally expanded substance 11 is contracted due to the drop in the temperature, the retainer 12 moves back together with the piston 8, the separating plate 7, the auxiliary piston 6 and the semifluid 5 as the pistons, the separating plate and the semifluid are pushed by the urging force to elastic material 17. According to this constitution, the assembly is facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a temperature-sensitive operating device u mainly used for controlling air-fuel mixture supplied to an automobile engine.

For example, in a carburetor for an automobile engine.

A so-called fully automatic choke device is employed in which nine throttle valves automatically close as the engine warms up.

This fully automatic choke device uses a temperature-sensitive actuator that includes a reversible thermal expansion material that expands significantly as the temperature rises, and is configured to link the closing operation of the throttle valve and the opening operation of the choke valve. The thermally expandable material is heated with engine cooling water, lubricating oil, or exhaust gas, or heated with electrical resistance heat.

The thermal expansion material of the temperature-sensitive actuator is a reversible material that is solid or viscous below the set temperature, gradually becomes liquid at higher temperatures, and expands significantly at that time. The expansion force pushes the piston and operates a link mechanism that interlocks the throttle valve and choke valve.

As the fluid material contracts when the temperature decreases, the piston and linkage must be moved in the opposite direction. Conventionally, the automatic choke device disclosed in Japanese Patent Publication No. 39-19311 has a temperature-sensitive actuating device called 1-Thermostat device, which uses a spring that acts on the link opposite the piston to control the temperature between the piston and the link mechanism. It performs the action when it drops. Also.

The automatic choke device disclosed in Japanese Patent Publication No. 46-19311 uses a spring acting on the piston of a temperature-sensitive operating device called a "temperature sensor" to cause the piston and link mechanism to operate when the temperature drops. In both cases, the spring is provided outside the temperature-sensitive actuating device, making assembly and adjustment cumbersome. Furthermore, “Theory and Practice of Vaporizers” by Takashi Yoshida
The automatic choke device disclosed on pages 134 to 136 of the first edition published by Railway Japan Sha Co., Ltd. on May 1, 1980, with a new title, has a retainer toviston that engages with the link mechanism, which is disposed coaxially to prevent Although it is equipped with a temperature-sensitive actuator with a built-in spring that causes the movement, separate springs act on the retainer and piston, so it is necessary to balance the force of the two springs with the expansion force of the thermally expandable material. is troublesome.

The present invention eliminates these drawbacks, moves the piston and retainer coaxially arranged together by the expansion force of a thermal expansion material, and moves them back together by the elasticity of a single elastic material, and also has a built-in spring. This invention was invented with the aim of providing a temperature-sensitive actuating device that is easy to assemble.

In order to achieve this object, the present invention includes a main body having nine penetrating holes, a container fixed to the base of the main body, a piston fitted into the hole of the main body, and a piston filled with the container. The thermal expansion material includes a thermal expansion material and an elastic film provided between the base end of the piston and the thermal expansion material, and the thermal expansion material is solid or viscous at a temperature below a set temperature and at a temperature higher than that. The temperature-sensitive actuating device is made of a reversible material that gradually becomes liquid and expands greatly at that time. A cover that protrudes from and surrounds the main body and has a base fixed to the main body, and an elastic member that is inserted between the retainer and the cover and acts to cause the retainer and the piston to retreat together. This is called special C.

Next, a specific example of the present invention will be explained based on the drawings. 1 is a main body, which has a large-diameter mounting base 2 on the proximal end side, a cylindrical guide portion 3 on the distal end side, and penetrates back and forth. A hole 4 is provided.

A semi-fluid material 59 with a small coefficient of thermal expansion, an auxiliary piston 6 made of synthetic rubber, a partition plate 7 made of synthetic 4 mJ resin, and a piston 8 are fitted into this hole 4 in order from the base end, and the piston 8 is The tip portion projects forward of the guide portion 3. A cylindrical container 10 with a bottom is stacked on the base end surface of the mounting base 2 with a stretchable M9 sandwiched therebetween and fixed to the main body 1 by caulking. The container 10 is filled with a reversible thermal expansion material 11 that gradually becomes liquid and expands greatly at that time.

, the hollow base part 13 of the retainer 12 is fitted almost tightly into the guide part 3 of the main body 1, and the tip of the piston 8 is fitted into the guide part 3 of the main body 1.
It is inserted into the hollow part 14 of 2.

A cover 16 surrounding the retainer 12 is also provided.

The base of the retainer 12 is fixed to the mounting base 2 by caulking, and the tip of the retainer 12 protrudes forward of the cover 16. Furthermore, a spring receiver 15 is formed at the base of the retainer 12.
An elastic member 17 made of a coiled spring is press-fitted between the cover 16 and the tip end surface of the cover 16.

The elastic material 17 keeps the piston 8 and the retainer 12 in constant contact, while at the same time keeping the membrane 9. Semi-fluid 5° auxiliary piston 6
, partition plate 7. The pistons 8 are brought into close contact with each other.

When the temperature rises and the thermally expandable material 11 expands, the membrane 9 bends toward the main body 1 and the semi-fluid material 5. The piston 8 is further protruded from the guide part 3 via the auxiliary piston 6 and the partition plate 7, and the first bullet 1'l-material 17 is applied, and the taker 12 is pushed by the piston 8 and moves forward together (second (see figure).
When the temperature decreases and the thermal expansion material 11 contracts, the elastic moon 1
Semi-fluid with elasticity of 7.5. Auxiliary screws 6. Partition plate 7-
, the retainer 12 retreats together with the pistons 8 (see FIG. 3).

It goes without saying that the first elastic member 17 may be constructed of a cushion made of silicon rc rubber or the like instead of a spring.

According to the present invention constructed as described above, the container and the cover are fixed to one main body, and the elastic material for retracting the retainer is built into the integrated structure, so assembly is not only easy, but also the piston and the retainer can be easily assembled. The structure is simple because the elasticity of a single elastic material is used to recede as a single unit, and it is easy to balance the expansion force of the thermally expandable material with the elasticity of a single elastic material, making it easy to adjust. It is easy to perform and can perform the required functions.

Also, a retainer is provided separately from the piston.

This retainer can be processed and incorporated according to the purpose, such as by providing means for contacting or engaging with the link mechanism, and can be used for a wide range of purposes simply by replacing the retainer and, if necessary, the elastic material.

Next, an example in which the device according to the present invention is implemented in a fully automatic choke device for a carburetor will be described with reference to FIG. 4.5.

In Fig. 4.5, 21 is a choke valve 22. 24 is a choke valve shaft to which a choke arm A is fixed; 24 is a throttle valve shaft to which a RAB valve 5 and a throttle arm A are fixed.

The temperature sensitive actuator of the present invention is designated generally at 20.

In FIG. 4, a cam path and a cam lever 29 are rotatably supported on a cam shaft 27, and the tip surface of the retainer 12 of the temperature-sensitive actuating device 20 is brought into contact with an adjustable receiving screw (T) provided on the cam path. The roller 31 supported on the aperture arm n is brought into contact with the cam crest of the cam path, and the choke arm n and the cam lever 29 are
and are connected by a connecting rod 32. The cam path and the cam lever 29 are connected by a connecting spring 33, and rotate together between the fully closed and fully open states of the choke valve n.

When the temperature decreases, the cutter 12 retreats toward the cover 16, and the cam 4 and cam levers 29 and 28
The return force acting on the 3.10 force causes the choke valve 22 to rotate clockwise in FIG.
2 rotates clockwise, the throttle valve 25 rotates in the opening direction.

When the temperature rises and the retainer 12 moves forward, the choke valve 22 rotates in the opening direction due to the opposite movement to the above, and the throttle valve 5
rotates in the closing direction. Bring it back 34 is power! - It is used only to close the choke valve 22 and open the throttle valve 25 by rotating the other clockwise, and the retainer 12 is retracted by the elastic material 17 wrapped in the cover 16.

Therefore.

The return spring 34 can be of a force smaller by the force of the elastic member 17, which helps improve the durability of the link mechanism.

FIG. 5 shows a choke valve shaft 21 and a cam shaft rotatably supporting a choke lever 35 and a throttle lever 36, respectively, and connecting these with a connecting rod 37, and also attaching a choke spring to the choke arm 23 and the rear of the choke lever. Connect the retainer 12 and the choke lever 35 with the arm lever:
It is connected by 39. When the temperature drops and the retainer 12 retreats, the choke lever 35 is rotated counterclockwise in FIG. , the aperture lever 36 is connected to the connecting rod 37
The throttle valve 2!5 is opened by being pulled by and rotated counterclockwise, pushing the throttle arm and rotating together. When the temperature rises L2 and the retainer 12 moves forward, the choke valve n rotates in the opening direction due to the opposite movement to the above.
The seventh aperture Y, 25 is rotated in the closing direction by the action of a large aperture spring as shown in the figure. This device is compared with the device shown in FIG. Cam28. There is no return spring 34, which simplifies the configuration accordingly.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention, and FIG. FIG. 3 is a longitudinal cross-sectional view showing the state at high temperature and low θX1. Figures 4 and 5 show state tax PHI as an example of use. 1. Book r4=, 2... Mounting base, 3. Guide part. 4...hole, 8...piston, 9...membrane,
10... Container. 11... Thermal expansion material, 12... Retainer, 16...
・Ka<-. 17... bullet E material. Agent Mutsumi Nozawa Aki No. 1 Figure 2 Figure 3

Claims (2)

[Claims] (1) A main body having a hole penetrating back and forth, a container fixed to the base of the main body, a piston fitted into the hole of the main body, a thermal expansion material filled in the container, and a container fixed to the base of the main body, a thermal expansion material filled in the container, a stretchable membrane disposed between the proximal end and the thermally expandable material. In the temperature-sensitive actuation device, the thermal expansion material is a reversible material that is solid or viscous at a temperature below a set temperature and gradually becomes liquid at a temperature higher than the set temperature, and expands greatly at that time. and a retainer that is moved forward as a unit by pushing the piston V, a cover that surrounds the retainer with its tip portion protruding forward and whose base portion is fixed to the main body, and is inserted between the retainer and the cover. 1. A temperature-sensitive actuating device, characterized in that an elastic member is provided that acts to cause the retainer and the piston to move back together. (2) Claims in which the elastic material is a coiled spring (
1) The temperature-sensitive actuation device according to item 1).