KR20170049970A - Electronic thermostat using heater and method for manufacturing the same - Google Patents

Abstract

The present invention relates to an electronic thermostat including a heater capable of being heated depending on power input to control opening/closing displacement of a valve, and a manufacturing method thereof. According to the present invention, an electronic thermostat to adjust a flow rate of coolant by a piston reciprocally moved in accordance with expansion and contraction of an expansible material comprises: an expansible material cylinder to close one end by a piston assembly including a piston, to receive the expansible material expanded and contracted in accordance with temperature; a pair of lead wires to which power is applied; a coil to connect one end and the other end to the lead wires, respectively; a heating tube having one closed end and the other opened end, receiving the coil inserted towards the one end from the other opened end to be mounted by protruding the other end of the lead wire to the outside, heated in accordance with heating of the coil, and inserting a side surface into the expansible material cylinder by pressure to transfer heat to the expansible material; filling filled inside the heating tube into which the coil is inserted; an insulation cap mounted in the other opened end of the heating tube filled with the filling by penetrating the lead wire; and a bush made of an insulation material to fixate the lead wires protruding outwards through the insulation cap mounted in the heating cap.

Description

[0001] ELECTRONIC THERMOSTAT USING HEATER AND METHOD FOR MANUFACTURING THE SAME [0002]

The present invention relates to an electronic thermostat and a method of manufacturing the same, and more particularly, to an electronic thermostat equipped with a heater capable of controlling opening and closing displacement of a valve by heat generation according to power application, and a method of manufacturing the same.

Generally, a thermostat for an automobile is installed between an engine and a radiator, and has a valve that is automatically opened and closed according to the temperature change of the cooling water, and controls the flow rate of the cooling water flowing into the radiator to maintain the cooling water at an appropriate temperature do. That is, the thermostat can control the temperature of the engine by controlling the flow rate of the cooling water according to the opening / closing displacement of the valve.

On the other hand, a thermostat for a vehicle is based on a mechanical thermostat having a structure in which expansion force of an expansion material such as wax expanding according to the temperature of a cooling water is transmitted to the piston to cause opening and closing displacement of the valve. A spring for supporting the valve, a capsule including an expansion material and a piston, etc. When the temperature of the cooling water is increased to a predetermined temperature (about 80 to 90 DEG C) The expansion material is changed from a solid state to a liquid state, and the expansion force generated by the volume change at this time is transmitted to the piston to operate the valve.

Since the mechanical thermostat thus constructed operates in accordance with the opening / closing temperature set at the predetermined temperature of the cooling water, that is, the valve is simply opened and closed at a predetermined temperature, There is a limitation in positively coping with changes in the driving environment or other conditions of the vehicle. In recent years, the electronic thermostat of the variable control system for maintaining the cooling water temperature of the engine at an optimum state while compensating for the disadvantages of the mechanical thermostat Stats are being presented.

In this case, a general electronic thermostat is generally composed of a basic component of a conventional mechanical thermostat, a connector for supplying power, and a heater for reacting the expansion material, so that a separate heat source, The opening and closing timing of the valve is variably controlled by adjusting the amount of heat of the heater in accordance with the running environment of the vehicle such as the speed of the intake air, the temperature of the intake air, the load of the engine,

However, in the conventional electronic thermostat as described above, in order to prevent the outflow of the expansion material when the heater and the case of the inflation material are coupled, the fastening body is press-fitted into the heater, the fastening body is screwed to the inflating material case, As a result, the number of parts increases and the process becomes complicated.

Korean Patent No. 10-1497655

SUMMARY OF THE INVENTION It is an object of the present invention to reduce the number of components and simplify the manufacturing process of the component itself by forming the heater into the inflating material case itself by press- It is an object of the present invention to provide an electronic thermostat and a method of manufacturing the electronic thermostat which can shorten the time required for a manufacturing process as the number of parts is reduced and the fastening method between parts becomes simple, .

SUMMARY OF THE INVENTION It is an object of the present invention to provide an electronic thermostat and a method of manufacturing the electronic thermostat which can increase the space occupied by the heater by reducing components other than the heating part of the heater, There is.

It is another object of the present invention to provide an electronic thermostat which can increase the efficiency of manufacturing thermostats by securing the robustness of sealing by combining a heater and an inflation material case by press fitting, .

In order to accomplish the above object, the present invention provides an electronic thermostat for regulating the flow rate of cooling water by a reciprocating piston in accordance with expansion and contraction of an expansion material, the electronic thermostat comprising: An expansion material cylinder enclosing said expansion material that is shielded and expands and contracts with temperature; A pair of lead wires to which power is applied; A coil having one end connected to the lead wire and the other end connected to the lead wire; The other end of the lead wire is mounted so as to protrude to the outside, the coil is heated to generate heat according to the heat of the coil, and the other end of the lead wire is heated, A heating tube which is press-fitted into the expansion material and transfers heat to the expansion material; A filler filled in the heat-generating tube into which the coil is inserted; An insulating cap mounted on the other end of the heat-generating tube filled with the filler through the lead wire; And a bush which is formed of an insulating material and fixes each of the lead wires projected outward through the insulating cap mounted on the heat generating tube.

Here, the exothermic tube may have an outer diameter at a side thereof contacting the expansion material cylinder, which is greater than an outer diameter of the other end side face that is opened.

In addition, the expansion material cylinder may have a guide formed at an entrance of a portion where the heat generating tube is press-fitted, which is wider than the outer diameter of the heat generating tube.

The inner diameter of the portion of the expansion material cylinder which is in contact with the exothermic tube may be smaller than the inner diameter of the exothermic tube adjacent to the other open end of the exothermic material cylinder.

Further, the bush may have a first convex piece on its outer circumferential surface, and the expansion material cylinder may have a curling portion corresponding to the first convex piece.

According to another aspect of the present invention, there is provided an electronic thermostat including an expansion material cylinder for accommodating an expansion material expanding and contracting according to a temperature, and a piston reciprocating in accordance with expansion and contraction of the expansion material, The electronic thermostat according to claim 1, further comprising: a pair of lead wires to which power is supplied; A coil having one end connected to the lead wire and the other end connected to the lead wire; The other end of the lead wire is mounted so as to protrude to the outside, the coil is heated to generate heat according to the heat of the coil, and the other end of the lead wire is heated, A heating tube which is press-fitted into the heating tube; A filler filled in the heat-generating tube into which the coil is inserted; An insulating cap mounted on the other end of the heat-generating tube filled with the filler through the lead wire; And a bush which is formed of an insulating material and fixes each of the lead wires projected outward through the insulating cap mounted on the heat generating tube.

Here, the exothermic tube may have an outer diameter at a side thereof contacting the expansion material cylinder, which is greater than an outer diameter of the other end side face that is opened.

According to another aspect of the present invention, there is provided a method of manufacturing an electronic thermostat for controlling the flow rate of cooling water by a reciprocating piston in accordance with expansion and contraction of an expansion material, Inserting lead wires having different lengths into both sides of the lead wire; Winding a coil around an outer peripheral surface of the bobbin; Connecting one end and the other end of the coil to each of the lead wires; Inserting the bobbin wound with the coil into a heating tube; Filling a filler in the heat-generating tube into which the bobbin is inserted; Mounting an insulating cap on the heating tube filled with the filling material; Molding a closed end of the exothermic tube into a curved surface; Pressing the heating tube into the expansion material cylinder; Mounting a bush on each of the lead wires protruding from the heating tube; Fixing the bush by curling the expanding material cylinder; Filling the expansion material cylinder with the expansion material; And shielding the inflating material with a piston assembly including the piston on the other side opposite to one side where the heating tube of the inflating material cylinder is press-fit.

The present invention relates to a thermostat which has a structure in which a heater is press-fitted into a casing of an expansion material when the heater is coupled to a casing of the expansion material which is an expansion material of the thermostat, It is easy to manufacture, reduces the number of parts, and omits the screw-fastening part, so that the fastening method is simple, so that the time required for the manufacturing process can be shortened.

Meanwhile, the present invention reduces the number of parts other than the heating part of the heater to increase the space occupied by the heating part of the heater, for example, the heating tube, And to provide a method of manufacturing the electronic thermostat.

In addition, by joining the heater and the case of the inflation material by press-fitting method, it is possible to secure the robustness of the sealing and at the same time, the important management item is reduced, so that the efficiency in manufacturing the thermostat can be increased.

1A to 1C are cross-sectional views illustrating an electronic thermostat according to an embodiment of the present invention.
2 is a view illustrating a heater mounted on an electronic thermostat according to an embodiment of the present invention.
3 is a view illustrating a method of manufacturing an electronic thermostat according to an embodiment of the present invention.

The description of the disclosed technique is merely an example for structural or functional explanation and the scope of the disclosed technology should not be construed as being limited by the embodiments described in the text. That is, the embodiments are to be construed as being variously embodied and having various forms, so that the scope of the disclosed technology should be understood to include equivalents capable of realizing technical ideas.

Meanwhile, the meaning of the terms described in the present application should be understood as follows.

The terms " first ", " second ", and the like are used to distinguish one element from another and should not be limited by these terms. For example, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

It is to be understood that when an element is referred to as being "connected" to another element, it may be directly connected to the other element, but there may be other elements in between. On the other hand, when an element is referred to as being "directly connected" to another element, it should be understood that there are no other elements in between. On the other hand, other expressions that describe the relationship between components, such as "between" and "between" or "neighboring to" and "directly adjacent to" should be interpreted as well.

It is to be understood that the singular " include " or "have" are to be construed as including the stated feature, number, step, operation, It is to be understood that the combination is intended to specify that it is present and not to preclude the presence or addition of one or more other features, numbers, steps, operations, components, parts or combinations thereof.

Each step may take place differently from the stated order unless explicitly stated in a specific order in the context. That is, each step may occur in the same order as described, may be performed substantially concurrently, or may be performed in reverse order.

All terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the disclosed technology belongs, unless otherwise defined. Terms defined in commonly used dictionaries should be interpreted to be consistent with meaning in the context of the relevant art and can not be construed as having ideal or overly formal meaning unless expressly defined in the present application.

FIGS. 1A to 1C are cross-sectional views illustrating an electronic thermostat according to an embodiment of the present invention. FIG. 2 is a cross-sectional view illustrating a heater 100 of an electronic thermostat according to an embodiment of the present invention. An electronic thermostat according to one embodiment of the present invention may include a heater 100, a connector terminal 200, an expansion material cylinder 310, a piston assembly 320 and an expansion material 330.

2, the heater 100 includes a lead wire 110, a bobbin 120, a heat generating tube 130, a coil 140, a filler 150, an insulation cap 160 And a bushing 170. The bushing 170 may be formed of a flexible material.

One end of the lead wire 110 is connected to an external power source through the connector terminal 200 and the other end of the lead wire 110 is inserted into the bobbin 120 and connected to the coil 140. At this time, the pair of lead wires 110 are formed to have different lengths as shown in FIG. 2. One lead wire 110 having a long length is inserted from the inside to the tip of the bobbin 120, One lead wire 110 having a short length is inserted into the inside of the bobbin 120 from the rear end of the bobbin 120 to the other end of the coil 140 wound around the outer circumferential surface of the bobbin 120, Can be connected.

That is, when power is supplied through the connector terminal 200, the lead wire 110 conducts current, and transmits the conducted current to the coil 140 so that the coil 140 can generate heat. To this end, the lead wire 110 may protrude to the outside through one opened end of the heat generating tube 130.

One end of a pair of lead wires 110 connected to an external power source is inserted into the bobbin 120 through the connector terminal 200 on both sides of the bobbin 120 and connected to the pair of lead wires 110 The coil 140 can be wound around the outer circumferential surface. Here, the bobbin 120 may be inserted into one open end of the heat generating tube 130.

2, the heater 100 is provided with the bobbin 120 and the coil 140 is wound on the bobbin 120 in a state where the lead wire 110 is inserted into the bobbin 120. The bobbin 120 is removed and the coil 140 is formed in the shape of a coil spring so that the coil 140 is inserted into the lead wire 110 at a predetermined distance from the respective lead wires 110 One end of the coil 140 may be connected to one lead wire 110 and the other end of the coil 140 may be connected to the other lead wire 110. [ That is, when the lead wire 110 and the coil 140 are connected without the bobbin 120, the coil 140 connected to the lead wire 110 is inserted into the heat generating tube 130, The filling material 150 filling the inside of the heat generating tube 130 replaces the function of the bobbin 120.

The heating tube 130 may be mounted on the bobbin 120 or may be mounted on the coil 140 in a state in which one end is closed and the other end is opened and the bobbin 120 or the coil 140 is inserted from one end to the other end. And the other end of each lead wire 110 connected to the other end of the lead wire 110 may be mounted so as to protrude outward. Here, the heat-generating tube 130 has one end closed to the inside of the expansion material 330 such as wax, raises the temperature of the expansion material 330 using heat generated from the coil 140, It is possible to prevent chemical corrosion by the expansion material 330 of the heat exchanger 140.

At this time, the heat-generating tube 130 can be press-fitted into the expanding material cylinder 310 at one side when inserting the one end into the expanding material 330. For this purpose, the outer diameter of the portion contacting the expanding material cylinder 310 is heat- May be formed larger than the outer diameter corresponding to the side surface near the open other end of the tube (130).

The coil 140 has one end connected to one lead wire 110 and one end connected to the other lead wire 110 among the lead wires 110 and having a bobbin 120 The bobbin 120 can be wound around the outer periphery thereof. At this time, when power is supplied to the lead wire 110, a current is transmitted to the coil 140 through the lead wire 110, and the coil 140 can be heated while a current flows along the coil 140.

The filling material 150 is filled in the heat generating tube 130 having the coil 140 inserted therein. When the bobbin 120 is inserted into the filling material 150, the heating tube 130 ). ≪ / RTI > At this time, the filling material 150 may be made of magnesium oxide (MgO) powder as an insulating material, and may serve also as a bobbin 120 when the bobbin 120 is not provided. That is, the magnesium oxide (MgO) powder as the filler 150 is an insulator, which maintains the insulation between the heat generating tube 130 and the coil 140 and prevents the coil 140 from flowing To the heat generating tube 130.

In this case, even when the power supply to the lead wire 110 is interrupted, foreign matter may be generated due to the ion change of the filler 150 due to the continuous power supply due to the ground current flowing in the vehicle. It is preferable to define the material as the filler 150.

The insulating cap 160 is mounted through the lead wire 110 at the other open end of the heat generating tube 130 filled with the filler 150. The insulating cap 160 seals the inside of the heat generating tube 130 filled with the filler 150 to prevent the filler 150 from leaking to the outside of the heat generating tube 130, The foreign substances that may be generated by the ion change of the filler 150 due to the continuous power supply by the ground current flowing in the heating tube 130 are prevented from leaking to the outside of the heat generating tube 130.

The bush 170 is made of an insulating material and performs an insulation function to prevent electricity from flowing between the expansion material cylinder 310 and the lead wire 110. The bush 170 also forms the shape of the lead wire 110 The giver plays a role.

The bush 170 fixes the respective lead wires 110 protruded through the insulating cap 160 mounted on the heat generating tube 130 and connects the curling portion 311 to the expansion material cylinder 310. [ Lt; / RTI > That is, the bushes 170 seal the inside of the expansion material cylinder 310 and fix the penetrating lead wires 110 so that the respective lead wires 110 are prevented from being damaged due to impact including vibration generated during running of the vehicle And serves to secure the connection with the connector terminal 200 while preventing the insulator from being broken or bent inside the expansion material cylinder 310 by the energy and coming into contact with the expansion material cylinder 310.

At this time, the bush 170 has a first convex piece 171 on its outer circumferential surface as shown in Fig. 1A, and the above-mentioned convex piece is formed in a shape corresponding to the first convex piece 171 of the bush 170, And can be combined with the curling portion 311 formed by curling the cylinder 310. [

In addition, the bushing 170 may be of a type having a planar side surface 172 as shown in FIG. 1C to provide directionality when the lead wire 110 is fastened to the connector 200, It does not.

Meanwhile, the connector terminal 200 serves to connect the external power source and the lead wire 110, and has a pair of connection terminals corresponding to a pair of the lead wires 110, do. The lead wire 110 has a concave groove corresponding to the convex piece of the connector terminal 200 at the distal end so as to be connected to the connector terminal 200. [ So that a firm connection can be established.

The expansion material cylinder 310 has an expansion material accommodating space in which an expansion material 330 such as wax is filled and is press-fitted into the heat generating tube 120 of the heater 100, Can be maintained in a state in which the exothermic tube 120 is inserted into the expansion material 330. Here, the curling portion 311 for mounting the bush 170 on the expansion material cylinder 310 may be formed so that the expansion material cylinder 310 and the heater 100 can be more firmly coupled. At this time, a guide groove is formed on the outer side of the expansion material cylinder 310 so that a leakage preventing rubber seal 341 and a cold / hot water mixing prevention rubber sealing 342 can be engaged, thereby preventing a leakage preventing rubber seal 341 and a cold / (342) can be easily formed in the expansion material cylinder (310).

1b, the expansion material cylinder 310 may include a guide 312 having an inlet wider than the outer diameter of the heat generating tube 120 for easy insertion when the heat generating tube 120 is press- Although not shown, the inner diameter of the portion of the heat-generating tube 120 which is in contact with the heat-generating tube 120 may be smaller than the inner diameter of the heat-generating tube. At this time, a bonding member may be used at a portion where the expansion material cylinder 310 and the heat generating tube 120 are in contact with each other.

The piston assembly 320 includes a piston 325 that is mounted on the lower end of the expansion material cylinder 310 and reciprocates in accordance with the expansion and contraction of the expansion material 330, It is possible to cause displacement of the valve opening / closing to regulate the flow rate of the cooling water supplied to the engine in accordance with the reciprocating movement. At this time, the piston assembly 320 may include a diaphragm 321, a rubber piston 322, a semi-moving body 323, a backup plate 324, a piston 325, and a piston guide 326.

A piston 325 is movably inserted and coupled to the piston guide 326. A backup plate 324 and a semi-movable body 323 are mounted on the piston 325, A rubber piston 322 and a diaphragm 321 are stacked in this order and a diaphragm 321 is attached to an upper end of the piston guide 326 so as to separate the semi-moving body 323 from the expanding material 330.

The expansion material 330 is accommodated in the accommodation space in the expansion material cylinder 310 and expands and contracts according to the heat generation and cooling of the heater 100 to thereby reciprocate the piston 325 .

On the other hand, the leakage preventing rubber seals 341 are formed in the guide grooves outside the expansion material cylinder 310 to prevent leakage of water when moisture permeates. For the sake of stability, Or more.

The rubber seal 342 for preventing cold / hot water mixing serves to shield the cooling water supplied to the engine and the hot water heated by the engine from being mixed with each other.

FIG. 3 is a view showing a method of manufacturing a heater mounted on an electronic thermostat according to an embodiment of the present invention. Referring to FIGS. 2 and 3, a method of manufacturing an electronic thermostat according to an embodiment of the present invention The following will be described in detail.

First, the lead wires 110 having different lengths are inserted into both sides of the bobbin 120 (S100). This process may be omitted in the form of the heater 100 in which the bobbin 120 is omitted.

Thereafter, the coil 140 is wound around the outer circumferential surface of the bobbin 120 with respect to the bobbin 120 having the lead wire 110 inserted therein (S200). At this time, the coils 140 are preferably wound on the outer peripheral surface of the bobbin 110 at regular intervals along the longitudinal direction.

Meanwhile, in the form of the heater 100 in which the bobbin 120 is omitted, the coil 140 may be formed in a spring shape that is wound with a certain interval.

Next, one end and the other end of the coil 140 wound on the outer circumferential surface of the bobbin 120 or having a spring shape without the bobbin 120 are connected to the respective lead wires 110 (S300). One end of the coil 140 is connected to one lead wire 110 having a long length and located at a depth corresponding to the inside of the closed end of the bobbin 120, And the other end of the coil 140 can be connected to the other lead wire 110 located near the other open end of the bobbin 120.

Thereafter, only the bobbin 120 or the coil 140 wound with the coil 140 is inserted into the exothermic tube 130 (S400), and the bobbin 120 or the coil 140 wound with the coil 140 is wound The filler 150 is filled in the inserted heat generating tube 130 (S500).

Next, when filling of the filling material 150 is completed, the insulating cap 160 is mounted on the heating tube 130 (S600), and the inside of the heating tube 130 filled with the filling material 150 is sealed do.

Thereafter, a closed end of the heat generating tube 130 formed of a cylindrical metal material is swaged by a curved surface through swaging, and the outer diameter is set to a predetermined dimension (S700).

Thereafter, as one end of the exothermic tube 130 mounted with the insulation cap 160 is inserted from the lower end of the expansion material cylinder 310, its side is pressed into the expansion material cylinder 310 (S800). The outer diameter of the portion of the exothermic tube 130 that is in contact with the expanding material cylinder 310 is set to be smaller than the outer diameter of the side surface of the exothermic tube 130 near the open end of the exothermic tube 130, As shown in Fig. The expansion material cylinder 310 may be formed with a guide 312 having an inlet wider than the outer diameter of the heat generating tube 120 for easy insertion when the heat generating tube 120 is press- The inner diameter of the portion where the tube 120 contacts is smaller than the inner diameter adjacent to the open end of the heat-generating tube.

Next, the bushes 170 are mounted on the respective lead wires 110 projecting from the heat generating tube 130 (S900).

The curling portion 311 is formed by curling the expansion material cylinder 310 in correspondence with the first convex portion 171 of the bushing 170 so that the curling portion 311 is formed between the expansion material cylinder 310 and the heater 100 Thereby further strengthening the coupling (S1000).

Next, the expansion material cylinder 310 is filled with the expansion material 330 (S1100), and the expansion tube cylinder 310 is inflated with the piston assembly 320 at the other side opposite to the side where the heat generating tube 130 is press- Thereby blocking the substance 330 (S1200). At this time, the piston assembly 320 sequentially inserts the diaphragm 321, the rubber piston 322, the semi-moving body 323, and the backup plate 324 into the piston guide 326, And then joining them in a movable manner.

Although the disclosed method and apparatus have been described with reference to the embodiments shown in the drawings for illustrative purposes, those skilled in the art will appreciate that various modifications and equivalent embodiments are possible without departing from the scope of the present invention. I will understand that. Accordingly, the true scope of protection of the disclosed technology should be determined by the appended claims.

100: heater
110: lead wire
120: Bobbin
130: exothermic tube
140: Coil
150: packing
160: Insulation cap
170: Bush
200: Connector terminal
310: expansion material cylinder
320: Piston assembly
330: Expansion material

Claims (8)

An electronic thermostat for regulating a flow rate of cooling water by a reciprocating piston in accordance with expansion and contraction of an expansion material,
An expansion material cylinder enclosing the expansion material, the one end of which is shielded by a piston assembly comprising the piston and which expands and contracts with temperature;
A pair of lead wires to which power is applied;
A coil having one end connected to the lead wire and the other end connected to the lead wire;
The other end of the lead wire is mounted so as to protrude to the outside, the coil is heated to generate heat according to the heat of the coil, and the other end of the lead wire is heated, A heating tube which is press-fitted into the expansion material and transfers heat to the expansion material;
A filler filled in the heat-generating tube into which the coil is inserted;
An insulating cap mounted on the other end of the heat-generating tube filled with the filler through the lead wire; And
And a bush formed of an insulating material and fixing each of the lead wires protruding out through the insulating cap mounted on the heat generating tube.
The method according to claim 1,
Wherein the exothermic tube has an outer diameter at a side thereof contacting the expansion material cylinder larger than an outer diameter of the other end side of the expansion tube.
The method according to claim 1,
Wherein the expansion material cylinder forms a guide at an entrance of a portion where the heat-generating tube is press-fitted, the guide being wider than an outer diameter of the heat-generating tube.
The method according to claim 1,
Wherein an inner diameter of a portion of the expansion material cylinder which portion is in contact with the exothermic tube is smaller than an inner diameter of the exothermic tube adjacent to the open other end side surface of the exothermic tube.
The method according to claim 1,
Wherein the bush has a first convex portion on an outer circumferential surface thereof,
Wherein the expansion material cylinder has a curling portion corresponding to the first convex portion.
1. An electronic thermostat having an expansion material cylinder for accommodating an expansion material expanding and contracting according to a temperature and regulating the flow rate of cooling water by a reciprocating piston according to the expansion and contraction of the expansion material,
A pair of lead wires to which power is applied;
A coil having one end connected to the lead wire and the other end connected to the lead wire;
The other end of the lead wire is mounted so as to protrude to the outside, the coil is heated to generate heat according to the heat of the coil, and the other end of the lead wire is heated, A heating tube which is press-fitted into the heating tube;
A filler filled in the heat-generating tube into which the coil is inserted;
An insulating cap mounted on the other end of the heat-generating tube filled with the filler through the lead wire; And
And a bush formed of an insulating material and fixing each of the lead wires protruding out through the insulating cap mounted on the heat generating tube.
The method of claim 6,
Wherein the exothermic tube has an outer diameter at a side thereof contacting the expansion material cylinder larger than an outer diameter of the other end side of the expansion tube.
A method for manufacturing an electronic thermostat for controlling a flow rate of cooling water by a reciprocating piston in accordance with expansion and contraction of an expansion material,
Inserting lead wires having different lengths into both sides of the bobbin;
Winding a coil around an outer peripheral surface of the bobbin;
Connecting one end and the other end of the coil to each of the lead wires;
Inserting the bobbin wound with the coil into a heating tube;
Filling a filler in the heat-generating tube into which the bobbin is inserted;
Mounting an insulating cap on the heating tube filled with the filling material;
Molding a closed end of the exothermic tube into a curved surface;
Pressing the heating tube into the expansion material cylinder;
Mounting a bush on each of the lead wires protruding from the heating tube;
Fixing the bush by curling the expanding material cylinder;
Filling the expansion material cylinder with the expansion material; And
And shielding the inflating material with a piston assembly including the piston on the other side opposite to the one side where the heating tube of the inflating material cylinder is press-fit.

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