Temperature-sensitive actuator

Abstract

Disclosed is a temperature-sensitive actuator which is configured in such a manner that heat from a PTC heater for the temperature-sensitive part of a thermoelement can be received appropriately and reliably in a required state. Specifically disclosed is a temperature-sensitive actuator (10) which is configured to sense the temperature although a piston (14) is operated forcibly by generating heat from a PTC heater (20) and warming the temperature-sensitive part (13) of a wax thermoelement, wherein a contact member (40) is interposed between the temperature-sensitive part of a thermoelement and the PTC heater. Consequently, variation in the amount of heat which is received at the temperature-sensitive part of a thermoelement from the PTC heater is limited, and the stabilized output (lift)of the thermoelement can be ensured.

Description

technical field [0001] The present invention relates to a temperature-sensitive actuator having a thermostatic element for advancing and retreating a piston according to temperature changes, and a PTC heater for selectively heating a temperature-sensing portion of the thermostatic element. Background technique [0002] This kind of temperature-sensitive actuator is used, for example, in the driven parts such as the electronic control device for the valve of the carburetor of the general-purpose engine, and is used to control the valves such as the yoke valve and the throttle valve that open and close the intake passage of the carburetor. Perform on-off control. [0003] As a conventional temperature-sensitive actuator of this type, there is a thermostatic element configured by sealing a thermostatic wax in a temperature-sensitive part, and a piston is provided that moves forward and backward in the axial direction in response to expansion and contraction accompanying tempera...

AI Technical Summary

Problems solved by technology

[0007] In addition, in the temperature sensing part of the above-mentioned thermostatic element, in order to prevent individual product differences due to subtle differences in the assembly method and wax filling amount during manufacture, such adjustments as the concave deformation of the bottom surface of the thermostatic element are usually carried out. process, but the resulting adjustment traces produce various traces due to the degree of adjustment

Moreover, the deformation caused by such adjustment traces, the flatness of processing, bending, shape, etc. will also make the contact between the temperature sensing part of the above-mentioned thermostatic element and the PTC heater become a point contact.

[0008] If the above-mentioned point contact state occurs, there will be insufficient power supply, and the PTC heater will not be able to exert its heat generation capacity to the fullest, and the heat conduction from the PTC heater will not be performed smoothly, and a stable output of the PTC heater will not be obtained. In addition, in the case of individual deviations and other adverse situations, in order to solve such problems, it is necessary to take some countermeasures

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