JP2002321126A - Method for assembling thermostat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a slide thermostat assembling method by which working efficiency of an inserting process of a C-type snap ring for the slide thermostat is improved, the inserting work can safely be done and further inspection accuracy can be improved by improving efficiency of an inspection process. SOLUTION: The slide thermostat assembling method comprises the step of a wax case process S1 for loading wax 112 into a wax case 111, the step of a case guide assembling process S2 for assembling a piston to a guide portion 108, the step of an element assembling process S3 for making an element 110 by fixing the wax case 111 and the guide portion 108, the step of a C-type snap ring assembling process S4 for completing a thermostat 100 by assembling a spring 105 and a C-type snap ring 115 through inserting the element 110 into a valve body 101, and the step of an inspection process S5 for classifying the completed thermostats into non-defective products and defective products by automatically inspecting the completed thermostats.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermostat used for cooling an internal combustion engine of an automobile or the like, and more particularly to a method of assembling a thermostat in which a valve slides in a main body to control a flow of a coolant.

[0002]

2. Description of the Related Art Currently, most of commercially available cooling systems for vehicular engines are cooled by a water-cooling system using a coolant as a medium. To prevent cooling, a thermostat is used to control the flow of the coolant. In addition, motorcycles, scooters, and the like have also shifted to water cooling in order to improve fuel efficiency and purify exhaust gas. Especially in recent scooters, the mounting space tends to be small in order to improve the design of the appearance, and a thermostat that can be directly mounted on the engine is used as a space-saving thermostat corresponding to these vehicles. It has become.

FIG. 9 shows such a thermostat. The thermostat 100 includes a hollow cylindrical valve main body 101, a thermovalve 102 that is housed in sliding contact with a hollow portion of the valve main body 101, and an engine formed integrally with the valve main body 101 and protruding to one end side. A projecting portion 103 which is fitted to an attachment member such as a block;
1 includes a joint cover 104 fitted to the other end, and a coil spring 105 as an urging member for applying an urging force to the thermovalve 102. The thermo valve 102 includes an element 110 including a piston 106 and a rubber piston 107 that move forward and backward due to the expansion of the wax, a guide portion 108 that guides the piston 106 to move forward and backward, and a temperature sensing part provided on the bottom side of the element 110. Wax case 1 for storing wax 112
11 and the like.

In the thermostat 100, when the coolant temperature is low, the wax 112 filled in the wax case 111 is contracted. At this time, the thermo valve 102 is constantly urged upward by the coil spring 105. Therefore, the element 110 is
At 20, the inlet opening 116 and the outlet opening 117 are held in a closed state, and the communication of the coolant is cut off. At that time, since the bypass outlet 119 is open, the coolant flows through the bypass inlet 119 provided in the C washer and the bypass outlet 119. When the coolant temperature rises, this rise in temperature is transmitted to the wax 112 filled therein via the wax case 111, and the wax 112 expands to increase the volume. Due to the increase in the volume of the wax 112, the diaphragm 114 is deformed upward, and the piston 106 tries to protrude from the guide 108 via the rubber piston 107. However, since the piston 106 is always in contact with the projection 103 of the valve body 101, the guide 1
08, that is, the element 110 descends so as to slide in the valve main body 101. When the element 110 is slid so as to slide downward, the valve body 120 of the element 110 is in the closed state.
16 and outlet opening 117 are opened. At this time, the bypass outlet 119 is open, but the element 1 that has descended
10, the bypass outlet 119 is closed and the outlet opening 117 is opened. Then, the flow of the coolant from the bypass inlet 118 is shut off, and the inlet opening 11
The flow of the cooling liquid is switched and controlled so that the cooling liquid 6 and the outlet opening 117 communicate with each other.

[0005] The thermostat 100 is assembled as follows. First, in the case process, the wax 11 serving as a temperature-sensitive member is placed in the wax case 111.
2 and the piston 1
06, a rubber piston 107 and a backup plate are inserted to fill a semi-fluid 113 and a guide assembly sealed with a diaphragm 114 is prepared.
11 and the guide portion 108 are fixed by caulking with a press or the like, and a piston is inserted into an element assembly (element 110).

Next, as shown in FIG. 10A, the element 110 is inserted into the valve body 101 from above, and the coil spring 105 is further inserted. The coil spring 105 is connected to the valve body 101.
While compressing so that it does not protrude from
5 is a washer groove 1 formed in the inner wall of the valve body 101.
01a, and the joint cover 104 is fitted to the valve body 101. Next, as shown in FIG. 10B, the O-ring 116 is fitted into the O-ring groove formed in the joint cover 104 and the protrusion 103, and the thermostat 100 is completed. Further, as shown in FIG. 11, an inspection is performed to determine whether the completed thermostat 100 has a predetermined performance. In this inspection method, an operator puts the thermostat 100 in an electric furnace or the like and heats the thermostat 100 to a predetermined temperature (90 ° C.), and the wax of the expanding body expands.
It was only visually checked whether the piston had moved to a predetermined stroke.

[0007]

However, in the process of assembling the conventional thermostat 100 described above,
There were the following problems. First, in the process of inserting the C-shaped retaining ring, it is necessary to fit the coil spring into the washer groove of the narrow valve body while compressing the coil spring manually, and further contract the C-shaped retaining ring while resisting the strong compression force of the coil spring. However, it is extremely difficult to perform the work while the efficiency is not improved, and this is a factor that hinders the production of the thermostat assembling process. In addition, in the process of inserting the C-shaped retaining ring, the operator must perform this operation with his / her fingertip, which puts a great burden on the operator, and in addition, if the operation fails and the coil spring is skipped, the operator is instructed. There was a risk of hitting or colliding with other parts, and there was also a problem with work safety.

In the inspection step, a lift inspection of the element is performed in hot water, and the thermostat 10 is assembled in a thermostat to be completed.
0 is heated to a predetermined temperature in an electric furnace, etc., and the door is opened. This time, the lift as a thermostat finished product is performed visually, so the inspection process is required twice before completion, or there is a problem with the accuracy of the inspection. There was also a problem that the valve opening state could not be confirmed accurately. Furthermore, in an electric furnace or the like, once the door is opened and the thermostat 100 is replaced, the internal temperature decreases, and it takes a long time to raise the temperature again to a predetermined temperature, which is inefficient.

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-mentioned problems, and has been made to improve the efficiency of the thermostat assembling process and to perform a safe operation. The present invention provides a method for assembling a thermostat that can improve the accuracy of the thermostat.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a wax case process for incorporating a wax into a wax case, a case guide assembly process for incorporating a piston in a guide portion, the wax case and the guide portion. An element assembling step of fixing the element to the element, a C-type retaining ring attaching step of inserting the element into the valve body, attaching a spring and a C-type retaining ring to complete the thermostat, and automatically attaching the completed thermostat. And an inspection process for sorting non-defective products and non-defective products.

The C-shaped retaining ring mounting step includes a C-shaped retaining ring aligning means for arranging the C-shaped retaining ring provided with a parts feeder, and a pair of holders opened and closed by a cylinder to open and close the C-shaped retaining ring. C-shaped retaining ring insertion means, comprising: the C-shaped retaining ring opening / closing mechanism for grasping or opening; and a vertical movement mechanism for inserting the C-shaped retaining ring grasped by the holder by a vertical cylinder into the work body. And a conveying means provided with a pick and press unit for moving the valve body in which the C-shaped retaining ring is inserted.

[0012] Further, the inspection step includes: a charging means for automatically charging the thermostat into the hot water tank; a hot water tank for heating the thermostat to a predetermined temperature; and a predetermined speed by gripping the thermostat in the hot water tank. An index table that rotates and moves, a measurement unit that measures the valve opening state of the thermostat that has reached the predetermined temperature, and a discharge unit that discharges the measured thermostat, and the thermostat has a measurement result of the measurement unit. In this way, non-defective products and defective products are automatically sorted and discharged.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for assembling a thermostat according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a process diagram showing a method for assembling a thermostat of the present invention;
2 is an explanatory view showing each step of the method of assembling the thermostat of FIG. 1, FIG. 3 is an explanatory view showing an element assembling step of the method of assembling the thermostat of FIG. 1, and FIG. 4 is a plan view showing a C-type retaining ring mounting device. FIG. 5 is a front view showing a C-shaped retaining ring mounting device, FIG. 6 is an explanatory diagram showing a procedure for inserting a C-shaped retaining ring,
FIG. 7 is a plan view showing a thermostat inspection device, and FIG. 8 is a cross-sectional view showing a measurement state of the thermostat in the inspection device of FIG. The same members as those of the conventional example are denoted by the same reference numerals, and detailed description will be omitted.

FIG. 1 shows the steps of a method of assembling a thermostat according to the present invention. A wax case step S1 for incorporating wax into a wax case, and a case guide assembly step S2 for incorporating a piston into a case guide.
An element assembling step S3 in which the wax case and the case guide are fixedly attached to each other to form an element;
C-shaped retaining ring mounting step S4 for mounting a shaped retaining ring to complete a thermostat, and inspection step S5 for automatically inspecting the completed thermostat to sort non-defective products and defective products.
And is composed of

First, a case process S1, a case guide process S2, and an element assembly process S3 are shown in FIG. In the case step S1, as shown in FIGS. 2A to 2C, the wax case 111 is filled with the wax 112 serving as a temperature-sensitive member and is inverted. Then, in the case guiding step S2, as shown in FIGS. 2D to 2G, the rubber piston 107 and the backup plate are inserted into the guide portion 108, the semi-fluid 113 is filled, and the guide portion 108 is sealed with the diaphragm 114. Stop. Further, in the element assembly step S3, as shown in FIG. 2 (h), the inverted wax case 111 and the wax case 111 are fitted to form a case guide assembly.

In the element assembling step S3, as shown in FIG. 3A, the wax case 111 and the guide portion 108 are fixed by caulking with a press or the like.
Next, as shown in FIG. 3B, after inserting the piston, the lower surface of the wax case 111 is pushed to adjust the stroke so that the amount of protrusion of the piston 107 becomes a predetermined value with the adjustment rod, and the element 110 is completed. Goods.

Further, in the C-shaped retaining ring mounting step S4, the piston 106 is inserted into the element 110,
Invert and incorporate into the valve body 101. Then
As shown in FIG. 10 (a), the coil spring 105 is fixed in the above state, the coil spring 105 is inserted into the valve body 101 from above, and the coil spring 105 is compressed so that the coil spring 105 does not protrude from the valve body 101. Then, a C-shaped retaining ring 115 is fitted into a ring groove 101a formed on the inner wall of the valve body 101, and a joint cover 104 is fitted onto the valve body 101. Further, as shown in FIG. 10B, the O-ring 116 is fitted into the O-ring groove 103a formed on the joint cover 104 and the projection 103, and the thermostat 100 is completed.

FIG. 4 shows an arrangement of an assembling apparatus used in a C-shaped snap ring mounting step S3 of the thermostat 100 according to the present invention. The thermostat assembling apparatus is disposed on a flat plate-shaped table T. The C-shaped retaining ring aligning means 1 for aligning and sequentially sending the C-shaped retaining ring 115, and the aligned C-shaped retaining ring 115. C-shaped retaining ring insertion means 10 for taking out and inserting it into the work body;
Transport means 30 for moving the work body into which the C-shaped retaining ring 115 has been inserted.

The C-shaped retaining ring aligning means 1 includes a C-shaped retaining ring 11
5 are arranged in one direction by applying vibration, and are generally called perfeeders and are commercially available. The C-shaped snap ring aligning means 1 includes a bucket 2 having a substantially circular planar shape and a spiral track formed on an inner peripheral wall thereof, a chute 3 serving as an alignment take-out port for parts from the bucket 2, and a bucket 2. And a vibration generating device 4 provided at the lower part of the vehicle. The vibration generator 4 is provided with an electromagnet (not shown). When an alternating current is applied to the electromagnet, an alternating magnetic attraction is generated between the electromagnet and a movable core (not shown) attached to the bottom of the bucket 2. The bucket 2 performs torsional vibration.

As shown in FIG. 5, the C-shaped retaining ring insertion means 10 includes a C-shaped retaining ring opening / closing mechanism 11 for holding and releasing the C-shaped retaining ring 115 by opening and closing a pair of holders with a cylinder. C holding the C-shaped retaining ring 115
A vertical movement mechanism 20 for inserting the shaped retaining ring opening / closing mechanism 11 into the work body by a vertically movable cylinder, and a moving arm for moving the C-shaped retaining ring insertion means 10 to the position of the C-shaped retaining ring alignment means 1 25 is a pick-and-press unit (PP) provided with.

As shown in FIG. 5, the C-shaped retaining ring opening / closing mechanism 11 of the C-shaped retaining ring inserting means 10 includes an upper holder 13 driven by an upper cylinder 12 and a lower holder 15 driven by a lower cylinder 14. The pair of upper holder 13 and lower holder 15 are supported by a support pin 18. Pins 16 and 17 are attached to tips of the upper holder 13 and the lower holder 15, respectively, for hooking a C-shaped retaining ring 115.
The pins 16 and 17 are inserted into pin holes 115a and 115b of a C-shaped retaining ring 115 shown in FIG.
5 is opened and closed.

That is, the C-shaped snap ring opening / closing mechanism 11
When the arm portion 13a and the arm portion 15a are brought closer by the upper cylinder 12 and the lower cylinder 14, the holder portion 13b and the holder portion 15b on the distal end side are separated from each other.
The C-shaped retaining ring 115 will be opened. On the other hand, when the arm 13a and the arm 15a are separated by the upper cylinder 12 and the lower cylinder 14, the holder 13b and the holder 15b on the distal end side come closer to each other.
15 will be closed. Therefore, the C-shaped retaining ring 11
When gripping the C-shaped ring 5, the pins 17 and 18 are
15 into the pin holes 115a and 115b,
When the C-shaped retaining ring 115 is closed to its natural size by bringing the holder 3b closer to the holder 3b, the C-shaped retaining ring 115 can be gripped by its resistance.

The vertical movement mechanism 20 includes a vertically movable cylinder 21 for vertically moving the C-shaped retaining ring opening / closing mechanism 11, a bracket 22 for mounting the C-shaped retaining ring opening / closing mechanism 11, and a spring 105 at the tip (see FIG. 6). ), The C-shaped retaining ring opening / closing mechanism 11 can be moved up and down, and the spring 105 inserted into the valve body 111 of the thermostat 100 can be pressed.

Next, the C-shaped retaining ring insertion means 10
The procedure for inserting the retaining ring 115 into the work body will be described with reference to FIGS. First, in FIG. 4, the spring 105 is attached to the valve body 101 at the working position of the table T.
Is inserted from the previous process while being set on the setting jig 31 (see FIG. 5). Next, as shown in FIG. 6A, the C-shaped retaining ring insertion unit 10 is moved by the moving arm 25 to the C-shaped retaining ring outlet of the C-shaped retaining ring alignment unit 1.
Then, as shown in FIG. 6B, the vertical movement mechanism 20 moves down the C-shaped retaining ring 115 and the pin hole 11 of the C-shaped retaining ring.
Pins 17 of the C-shaped snap ring opening / closing mechanism 11 are attached to 5a and 115b,
Insert 18 and close it. Then, since the C-shaped retaining ring opening / closing mechanism 11 can grip the C-shaped retaining ring 115, the C-shaped retaining ring opening / closing mechanism 11 is raised by the vertical movement mechanism 20 and moved to the position of the thermostat 100 by the moving arm 25. .

Next, as shown in FIG. 6C, when the up-down movement mechanism 20 is lowered, the up-down movement mechanism 20 pushes the spring 105 with the pressing block 23, and the C-shaped snap ring opening / closing mechanism 11 opens the valve. C-shaped retaining ring groove 10 of main body 101
Lower to the position of 1a. Further, at this position, when the C-shaped snap ring opening / closing mechanism 11 opens the pins 17 and 18,
As shown in FIG. 6D, the C-shaped retaining ring 115 spreads by its own elastic force, and is fitted into the C-shaped retaining ring groove 101a. Then, it is confirmed that the mounting state of the C-shaped retaining ring 115 is OK, and if it is OK, the C-shaped retaining ring opening / closing mechanism 11 is raised.

Further, the C-shaped retaining ring 1 is attached to the valve body 101.
After attaching the joint 15, the joint cover 104 is fitted as shown in FIG. 10B, and the assembly of the thermostat 100 is completed. Then, the thermostat 100 is transported by the transport means 30 to the next inspection step S4, where required performance is inspected. As shown in FIG. 4, the transport means 30 uses a pick-and-press unit (PP) similar to the C-shaped retaining ring insertion means 10, and the thermostat 100 is gripped by a grip using hydraulic pressure. The thermostat 100 is moved to a predetermined position by the arm portion, and the thermostat 100 is released from the grip portion at the predetermined position.

As described above, in the C-shaped retaining ring mounting step of the method for assembling the thermostat of the present invention, the C-shaped retaining ring aligning means 1 and the C-shaped retaining ring inserting means are replaced by manual operation by a conventional person. 10 and the conveying means 30, and automatically inserts the C-shaped retaining ring, so that the operator is free from the trouble of inserting the C-shaped retaining ring and can work safely. The efficiency is improved.

Next, the inspection step S4 will be described with reference to FIGS. FIG. 7 is a plan view showing an outline of the inspection apparatus 40. The inspection device 40 includes a thermostat 10
0 for supplying automatically to the hot water tank 43
P41, a hot water tank 43 for heating the thermostat 100 to a predetermined temperature, and a thermostat 100 in the hot water tank 43.
An index table 42 that grips and rotates at a predetermined speed, a measurement unit 50 that measures the valve opening state of the thermostat 100 that has reached a predetermined temperature, and a discharge P / P 44 of a discharge unit that discharges the measured thermostat 100.
And an OK chute 45 and an NG box 46.

The supply P / P 41, which is a charging means, uses the same pick and press unit as the C-shaped retaining ring insertion means 10 and the transporting means 30, and is transported from the C-shaped retaining ring mounting step S3. The thermostat 100 is gripped by the gripping portion, moved to the index table 42 by a moving arm, and inserted into the insertion hole 42a of the index table 42. Also, the index table 42
The rotary table is immersed in a hot water tank 43, and around the thermostat 100, 16 insertion holes 42a, 42a, 42a... Formed at equal intervals are formed. The thermostat 100 is heated by the hot water tank 43 until the thermostat 100 is inserted by the supply PP 51 and reaches the position of the measuring unit 50 until the thermostat 100 is inserted by the supply PP 51 so that the index table 42 has a predetermined temperature (for example, 90 ° C.). It is operated at a high rotational speed.

The hot water tank 43 includes an index table 42
The thermostat 100 inserted at a predetermined temperature of 90 °
C, and the index table 42 is also heated to stabilize the temperature. Therefore, the hot water tank 43 is provided with a heater with a temperature adjusting function (not shown), so that the hot water is always maintained at a predetermined temperature.

The measuring unit 50 is, as shown in FIG.
It is to measure whether the thermostat 100 has opened to reach a predetermined temperature and the piston 107 has reached a predetermined protrusion amount. For this reason, the measurement terminal 51 of the dial gauge is applied to the bottom of the wax case 11 that has been pushed up when the temperature has reached the predetermined temperature. Has become. And this measuring unit 50 is used for discharging P ·
The thermostat 100 connected to the controller of P44 and judged to be 0K is carried out to the OK chute 45. On the other hand, the thermostat 100 that does not reach the predetermined protrusion amount or the thermostat 100 whose protrusion amount is equal to or more than the predetermined amount is determined to be NG, and the exclusive NG box 46 is used by the discharge P / P 44.
It is to be collected inside.

According to the above-described inspection process, the thermostat 100 on which the C-shaped retaining ring has been mounted is supplied with the supply PP.
51, it is automatically loaded into the inspection device 40 and the hot water tank 4
The thermostat 100, which has been stably heated to the predetermined temperature by the step 3 and has reached the predetermined temperature, is automatically measured by the measuring unit 50, and the non-defective and non-defective products are automatically sorted based on the measurement result, and the defective products are exclusively used. Is collected in the dedicated NG box 46, so that the efficiency in the inspection process can be improved and the accuracy of the inspection can be improved.

[0033]

As described above, in the method for assembling the thermostat according to the present invention, the C-shaped retaining ring mounting step comprises: a C-shaped retaining ring aligning means for arranging the C-shaped retaining ring with a parts feeder; A C-shaped retaining ring opening / closing mechanism for opening and closing a pair of holders to grip or release the C-shaped retaining ring, and a vertical movement for inserting the C-shaped retaining ring gripped by the holder into the work body by a vertical movement cylinder Mechanism and
And a C-shaped retaining ring insertion means provided with: a C-shaped retaining ring that is automatically aligned can be taken out and inserted into the work body. It is possible to eliminate the difficulty and inefficiency of work due to the work, and to achieve an excellent effect that efficient and safe work can be performed.

[0034] In the inspection step, the injection means for automatically charging the thermostat into the hot water tank, a hot water tank for heating the thermostat to a predetermined temperature, and the thermostat held in the hot water tank at a predetermined speed. By providing a turntable that rotates and moves, a measurement unit that measures the valve opening state of the thermostat that has reached the predetermined temperature, and a discharge unit that discharges the measured thermostat, the thermostat is automatically connected to the inspection device. Since it is charged and measured, it can be used in hot water and
Since the inspection can be performed in a single process, the efficiency in the inspection process can be improved and the accuracy of the inspection can be improved.

[Brief description of the drawings]

FIG. 1 is a process chart showing a method for assembling a thermostat according to the present invention.

FIG. 2 is an explanatory view showing each step of a method for assembling the thermostat of FIG. 1;

FIG. 3 is an explanatory view showing an element assembling step of the thermostat assembling method of FIG. 1;

FIG. 4 is a plan view showing a C-shaped snap ring mounting device of the thermostat.

FIG. 5 is a front view showing a C-shaped snap ring mounting device of the thermostat.

FIG. 6 is an explanatory view showing a procedure for inserting a C-shaped retaining ring of the thermostat.

FIG. 7 is a plan view showing a thermostat inspection device.

8 is a cross-sectional view showing a measurement state of a thermostat in the inspection device of FIG.

FIG. 9 is a sectional view showing a conventional thermostat.

FIG. 10 is a process diagram showing the assembly of a conventional thermostat.

FIG. 11 is an explanatory view showing a conventional thermostat inspection method.

[Explanation of symbols]

 S1 Wax case process S2 Guide assembly process S3 Element assembly process S4 C-shaped retaining ring mounting process S5 Inspection process T Table 1 C-shaped retaining ring aligning means 2 Bucket 3 Chute 4 Vibration generator 10 C-shaped retaining ring inserting means 11 C-shaped retaining Wheel opening / closing mechanism 12 Upper cylinder 13 Upper holder 14 Lower cylinder 15 Lower holder 16 Pin 17 Pin 18 Spindle pin 20 Vertical movement mechanism 21 Vertical movement cylinder 22 Bracket 23 Press block 25 Moving arm 30 Transport means 40 Inspection device 41 Injection P・ P 42 Index table 43 Hot water tank 44 Discharge P ・ P 45 OK chute 46 NG box 50 Measurement unit 100 Thermostat 101 Valve body 102 Thermo valve 103 Projection 104 Joint cover 105 Pulling 107 the piston 107 rubber piston 108 guide portion 110 elements 111 wax case 112 wax 113 antiferromagnetic fluid 114 diaphragm 115 C Washer 116 inlet opening 117 outlet opening 118 bypasses the inlet portion 119 bypass outlet 120 valve body

Claims (3)

[Claims] 1. A wax case process for incorporating a wax into a wax case, a guide assembly process for incorporating a piston into a guide portion, an element assembly process for fixing the wax case and the guide portion to form an element, and a valve for the element. A C-type retaining ring mounting process of inserting a spring and a C-type retaining ring into the body to complete a thermostat, and an inspection process of automatically inspecting the completed thermostat to sort non-defective products and defective products. A method for assembling a thermostat, comprising: 2. The C-shaped retaining ring mounting step includes: a C-shaped retaining ring aligning means having a parts feeder for aligning the C-shaped retaining ring;
The C-shaped retaining ring opening / closing mechanism for gripping or releasing the retaining ring, and the C-shaped retaining ring held by the holder by a vertically moving cylinder.
C-shaped retaining ring insertion means having a vertical movement mechanism for inserting a shaped retaining ring into the work body, and conveying means equipped with a pick and press unit for moving the thermostat body into which the C-shaped retaining ring is inserted. 2. The method for assembling a thermostat according to claim 1, wherein the method comprises: 3. The inspection step includes: a charging means for automatically charging the thermostat into the hot water tank; a hot water tank for heating the thermostat to a predetermined temperature; and a predetermined speed by holding the thermostat in the hot water tank. An index table that rotates and moves, a measurement unit that measures the valve opening state of the thermostat that has reached the predetermined temperature, and a discharge unit that discharges the measured thermostat, and the thermostat has a measurement result of the measurement unit. 2. The method according to claim 1, wherein non-defective products and defective products are automatically sorted and discharged.