KR101344504B1 - A cap of radiator preparation method thereof - Google Patents

Abstract

The present invention relates to a radiator cap and a manufacturing method thereof, the outer cap being fixed to the outside of the cooling water inlet of the radiator; An inner cap comprising a gasket spring provided below the outer cap and a gasket elastically supported by the gasket spring to seal an upper opening of the cooling water inlet; Double injection of a sealing member having an elasticity on a lower surface of the inner cap to contact the upper portion of the link, a spring provided inside the link, and an upper portion of the variable pressure sealing portion formed inside the cooling water inlet to seal the cooling water inlet. A pressure valve comprising a plate installed to flow up and down along the inner circumference of the link via the spring; And a negative pressure valve installed on the pressure valve so as to flow up and down to open and close a flow passage communicating with a through hole formed at a side of the cooling water inlet.

Radiator, Cap, Pressure Valve, Negative Pressure Valve, Outer Cap, Inner Cap

Description

Radiator cap and manufacturing method thereof {A CAP OF RADIATOR PREPARATION METHOD THEREOF}

The present invention relates to a radiator cap and a method of manufacturing the same, and more particularly, a plate supporting a spring of a pressure valve and a sealing part for sealing a variable pressure sealing part of a radiator inlet are double-injected to integrate the sealing part and the plate. The present invention relates to a radiator cap having improved function by preventing deformation of the sealing part and a method of manufacturing the same.

The vehicle is provided with a cooling device for cooling the engine and various heat generating parts. The cooling device is generally provided with a circulation pump that circulates the cooling water by receiving power from the engine, and is supplied with coolant in a relatively high temperature state by heat exchange with the engine. It consists of a radiator that is cooled by heat exchange with air and then supplied to the engine again.

1 is a view showing a general radiator, the radiator 190 is a pair of header tanks 191 disposed at a predetermined distance apart from the upper and lower sides, and the both ends are connected between the header tank 191 is connected to the cooling water flow path Consists of a tube to form and a heat radiation fin interposed between the tube, the upper header tank 191 is formed with a cooling water inlet 170 and the cooling water inlet 170 is provided with a radiator cap 110 to open and close it. .

The radiator cap 110 provided at the end of the cooling water inlet 170 to seal the cooling water inlet 170 not only hermetically closes the cooling water inlet 170 but also changes the temperature and pressure inside the radiator 190 The cooling water is discharged from the radiator 190 to the outside and the cooling water flows into the radiator 190 from the outside.

Figure 2 shows a conventional radiator cap and its operation, the radiator cap 110 is the outer cap 120 and fixed to the outside of the cooling water inlet 170 of the radiator 190, and the outer cap 120 An inner cap 130 disposed below the inner cap 130 to seal an upper opening of the cooling water inlet 170, and disposed below the inner cap 130 and generated according to a change in the coolant temperature inside the radiator 190. Pressure valve 140 for opening and closing the cooling water inlet 170 by the pressure, and the pressure valve 140 is installed on the radiator 190 when the negative pressure is generated inside the radiator 190 and the It consists of a negative pressure valve 160 to form a flow path between the through-hole 172 formed through the side wall of the cooling water inlet 170.

The inner cap 130 includes a gasket 133 for sealing the upper opening of the cooling water inlet 170 and a gasket spring 131 for elastically supporting the gasket 133, Lt; / RTI >

The pressure valve 140 is a ring-shaped sealing member 151 for sealing the variable pressure sealing portion 171 formed in the cooling water inlet 170 and fixing a portion of the inner circumference of the sealing member 151 A plate 150, a lower retainer 193 hollowed and disposed on the upper portion of the plate 150, and an upper portion of the lower retainer 193 and disposed below the gasket spring 131 of the inner cap 130. A combined upper retainer 192, a cylindrical link 141 formed along an inner circumference of the lower retainer 192 and a lower retainer 193, and an outer circumferential edge of the link 141. And a spring 142 interposed between the lower retainers 192 and 193.

The negative pressure valve 160 is provided with a valve stem 161 installed to flow up and down through the plate 150 and the sealing member 151 of the pressure valve 140, and the valve stem 161. It consists of a stop ring 162 for fixing the upper end of the.

Referring to the operation of the radiator cap, if the temperature of the coolant flowing in the radiator increases as shown in Figure 2a to increase the pressure as the volume of the coolant and air charged in the radiator increases do. As such, when the pressure rises inside the radiator, the plate 150 which is elastically supported by the spring 142 and the sealing member 151 fixed to the plate 150 are pushed upward by the elevated pressure. Therefore, a space in which cooling water or air can be distributed is formed between the sealing member 151 and the variable pressure sealing part 171 of the cooling water injection port 170.

The cooling water or the air charged in the radiator through the space formed between the sealing member 151 and the variable pressure sealing member 171 flows through the through hole 172 formed in the side of the cooling water injection port 170, (Not shown).

The pressure inside the radiator is reduced by the operation of the pressure valve 140 as described above, so that the plate 150 is lowered due to the elasticity of the spring 142 and thus disposed below the plate 150. The variable pressure sealing part 171 is sealed by the sealing member 151.

On the contrary, as shown in FIG. 2B, when the temperature of the coolant and air charged in the radiator decreases due to the engine stopping or for other reasons, the pressure decreases as the volume of the coolant and air charged in the radiator decreases. Is reduced.

When the negative pressure is generated in the radiator, the valve stem 161 of the negative pressure valve 160 is lowered due to the influence of the self weight and the negative pressure, thereby forming a flow path in the through hole 172 and the radiator.

Accordingly, the cooling water or air charged in the reservoir tank (not shown) through the flow path flows into the radiator through the through hole 172 formed in the side of the cooling water injection port 170.

The pressure inside the radiator is increased by the operation of the negative pressure valve 160 as described above, so that the valve stem 161 is raised or lowered by the pressure inside the radiator.

As described above, the radiator cap 110 has the negative pressure when the internal pressure of the radiator is greater than a predetermined pressure, the pressure valve 140 is opened to discharge the cooling water to the outside, and the negative pressure is formed at the negative pressure inside the radiator. The valve 160 descends to allow the coolant to flow from the outside.

However, as shown in FIG. 2C, the sealing member 151 for sealing the variable pressure sealing part 171 is manufactured separately from the plate 150 and fixed to one end of the plate 150, thereby sealing the sealing member. Since the 151 and the plate 150 are not firmly adhered to each other, the sealing member 151 is deformed due to the pressure inside the radiator and the elastic force of the spring 142.

Such a problem may be caused when the pressure is greater than or equal to that of raising the negative pressure valve 160 in the radiator or the pressure cannot be raised by the pressure valve 140. ) Is lowered to seal the variable pressure sealing unit 171 and the valve stem 161 of the negative pressure valve 160 is raised to abut on the lower surface of the sealing member 151, wherein the sealing member 151 Due to the deformation of the negative pressure valve 160 and the sealing member 171 is not in close contact with the cooling water in the radiator along the contact portion between the negative pressure valve 160 and the sealing member 171 as shown in the drawing There is a problem of leaking to the outside.

This problem not only degrades the performance of the radiator cap 110, but also has a problem that adversely affects the function of all the devices in which the coolant is distributed.

In addition, as the inner cap 130 installed below the outer cap 120 is coupled to the head 121 penetrating the outer cap 120 to be rotatable without being fixed to the outer cap 120. As the coupling structure becomes complicated, the head 121 must be further provided, which increases the number of components constituting the radiator cap 110, thereby increasing the number of man-hours in the manufacturing process, thereby increasing manufacturing time and manufacturing cost. Occurred.

3 is a view showing a conventional radiator cap and its operation designed to improve the problem of the radiator cap as described above, as shown, the radiator cap 110 is an outer cap 120 and the outer cap An inner cap 170 disposed at a lower side of the 120 to seal an upper opening of the coolant inlet 170, and a variable pressure sealing part of the coolant inlet 170 provided at a lower side of the inner cap 170; A pressure valve 140 for sealing 171 and a negative pressure valve 160 installed on the pressure valve 140 to flow up and down.

As shown in the drawings, the radiator cap 110 has an improved structure, and a second sealing member 164 is provided on the valve stem 161 of the negative pressure valve 160 which is in contact with the bottom surface of the pressure valve 140. The first sealing member 151 is provided in the pressure valve 140 which is in contact with the variable pressure sealing part 171 of the cooling water inlet 170, and the pressure valve 140 and the negative pressure valve 160 and the pressure The contact portion of the valve 140 and the variable pressure sealing portion 171 is sealed.

However, as described above, the second sealing member 164 is provided on the valve stem 161, and the second fixing tool 163 is provided to fix the second sealing member 164 and the first sealing member 151. As the first fixing tool 153 is further provided for fixing, the components constituting the radiator cap 110 are increased, thereby increasing the number of man-hours in the manufacturing process and thereby increasing manufacturing time and manufacturing cost. .

In addition, since the second sealing member 164 is provided on the valve stem 161 and the central portion of the plate 150 contacting the second sealing member 164 is formed to protrude toward the second sealing member 164. Accordingly, the upper and lower lengths of the radiator cap 110 are long, so that it is difficult to apply to a short radiator of a neck having a coolant inlet 170 formed thereon, and even if the upper and lower lengths are long, the distribution of the coolant is inhibited. As a reference to the drawings, as the lower end of the radiator cap 110, that is, the negative pressure valve 160 is exposed on the cooling water flow path 192, the negative pressure valve 160 directly hits the flow of the cooling water and malfunctions. This occurred.

In addition, the inner cap 130 installed on the lower side of the outer cap 120 is coupled to the head 121 passing through the outer cap 120 so as to be rotatable without being fixed to the outer cap 120. As the coupling structure is complicated, the number of parts increases as the head 121 is further provided.

The present invention has been made to solve the above problems, an object of the present invention is to seal the space between the pressure valve and the variable pressure sealing portion of the cooling water inlet and also sealing the space between the pressure valve and the negative pressure valve By double-injecting the part with the plate coupled to the upper part of the sealing part, the sealing part and the plate are firmly coupled to provide a radiator cap with improved function as the deformation of the sealing part is prevented.

In addition, the number of parts constituting the radiator cap is reduced to provide a radiator cap that reduces the number of man-hours in the manufacturing process and the manufacturing time and manufacturing cost.

In order to achieve the above object, the radiator cap of the present invention includes an outer cap fixedly fixed to the outside of the cooling water inlet of the radiator; An inner cap comprising a gasket spring provided below the outer cap and a gasket elastically supported by the gasket spring to seal an upper opening of the cooling water inlet; Double injection of a sealing member having an elasticity on a lower surface of the inner cap to contact the upper portion of the link, a spring provided inside the link, and an upper portion of the variable pressure sealing portion formed inside the cooling water inlet to seal the cooling water inlet. A pressure valve comprising a plate installed to flow up and down along the inner circumference of the link via the spring; And a negative pressure valve installed on the pressure valve so as to flow up and down to open and close a flow passage communicating with a through hole formed at a side of the cooling water inlet.

Here, the outer cap is formed with a protrusion so that a portion of the center penetrates through the gasket spring to be coupled to the upper surface of the link, the gasket spring is characterized in that the through hole is formed so as to be rotated by fitting to the protrusion.

On the other hand, the outer cap is coupled to the upper portion of the gasket spring, the gasket spring is characterized in that the coupling is formed integrally with the upper portion of the link.

Method for producing a radiator cap of the present invention for achieving the above object is a double injection step (S1) of the double injection so that the sealing portion is integrated in the lower portion of the plate in contact with the cooling water inlet and the negative pressure valve; A negative pressure valve assembly step (S2) of assembling a negative pressure valve to the double injection plate; An outer cap and a gasket spring coupling a gasket for sealing an upper opening of the cooling water inlet to an outer cap fixed to the outside of the cooling water inlet, a gasket spring for elastically supporting the gasket, and a link having a spring disposed therein; Link coupling step (S3); And a plate assembly step (S4) for assembling the plate in which the spring and the negative pressure valve are assembled in the link.

As described above, according to the present invention, since the sealing part sealing the variable pressure sealing part of the cooling water inlet is double-jected together with the plate formed on the sealing part, the sealing part and the plate are firmly coupled to each other to prevent deformation of the sealing part. This has the effect of improving the function of the radiator cap.

In addition, since the number of components constituting the radiator cap is reduced, there is a peculiar effect of reducing the number of man-hours and manufacturing time and manufacturing cost in the manufacturing process of the radiator cap.

In addition, there is an effect that the upper and lower length of the radiator cap can be applied to a radiator formed of a short neck as well as a radiator formed of a long neck.

DETAILED DESCRIPTION Details of the object and the technical constitution according to the present invention will be clearly understood by the following description with reference to the accompanying drawings showing preferred embodiments of the present invention.

Hereinafter, the radiator cap of the present invention having the configuration as described above and a manufacturing method thereof will be described in detail with reference to the accompanying drawings.

Figure 4 is a cross-sectional view showing the radiator cap and the operation of the present invention, Figure 5 is an exploded cross-sectional view showing a radiator cap of the present invention, Figure 6 is a cross-sectional view showing another embodiment of the radiator cap of the present invention, Figure 7 is 8 is an exploded cross-sectional view showing another embodiment of the radiator cap of the present invention, Figure 8 is a flow chart showing a manufacturing method of the radiator cap of the present invention.

4 and 5 are views showing the radiator cap and the operation of the present invention, as shown, the radiator cap of the present invention is to seal the cooling water inlet of the radiator, largely fixed to the outside of the cooling water inlet 70 The outer cap 20, an inner cap 30 disposed below the outer cap 20 to seal an upper opening of the cooling water inlet 70, and an inner cap 30 disposed below the inner cap 30. When the pressure valve 40 to open and close the cooling water inlet 70 by the pressure generated in accordance with the change in the temperature of the cooling water in the radiator, and the pressure valve 40 is installed to generate a negative pressure inside the radiator It consists of a negative pressure valve 60 so that a flow path is formed between the inside of the radiator and the through-hole 72 formed through the side wall of the cooling water inlet 70.

The outer cap 20 is fixed to the coolant inlet 70 as described above to maintain the fixed state of the radiator cap 10 and is fixed to the outside of the coolant inlet 70.

The inner cap 30 disposed below the outer cap 20 may include a gasket 33 for sealing an upper opening of the cooling water inlet 70, and a gasket spring 31 for elastically supporting the gasket 33. ) To seal the upper opening of the cooling water inlet (70).

The pressure valve 40 is to be pushed upward by the pressure when a predetermined or more pressure occurs in the radiator to allow the coolant to be discharged from the inside of the radiator to the outside, the variable pressure formed in the coolant inlet 70 The plate 50 double-injected so that the ring-shaped sealing part 51 which seals the sealing part 71 is located below, the link 41 formed in the upper part of the plate 50, and the said link 41 ) And a spring 42 provided between the plate 50 and the plate 50.

Here, the upper portion of the double-injected plate 50 is made of a resin material having a predetermined rigidity as it should be elastically supported by the spring 42, and the sealing portion 51, that is, the lower portion of the plate 50 Is made of a rubber (rubber) with a large deformation so that the contact with the upper portion of the variable pressure sealing portion 71, and the valve stem 61 constituting the negative pressure valve 60 to maintain a tightly sealed state desirable.

The pressure valve 40 configured as described above is partially inserted into the inner circumference of the link 41 so that the plate 50 flows up and down along the inner circumference of the link 41. In addition to being elastically supported, the plate 50 is fixed to the lower end of the inner circumference of the link 41.

At this time, the locking jaw 52 is formed on the outer circumference of the plate 50 so that the plate 50 is freely moved up and down along the inner circumference of the link 41. It is preferable that the fixing part 43 is formed so that the locking jaw 52 is caught and fixed.

When the negative pressure valve 60 is formed inside the radiator, the negative pressure valve 60 descends to allow the coolant to flow into the radiator from the outside, and flows upward and downward through the plate 50 of the pressure valve 40. It consists of a valve stem 61 provided so that it can move, and the stop ring 62 which fixes the upper end part of the said valve stem 61. As shown in FIG.

Hereinafter, the operation of the radiator cap of the present invention will be described.

FIG. 4A illustrates the operation of the radiator cap 10 in a state in which a pressure of a predetermined pressure or more is formed in the radiator as the temperature of the coolant circulated in the radiator is increased to increase the volume of the coolant and air charged in the radiator. As shown in the drawings, as the pressure rises inside the radiator, the plate 50 elastically supported by the spring 42 is pushed upward to the plate 50 and the coolant inlet 70. Between the variable pressure sealing part 71 of the space is formed a space capable of flowing coolant to air.

As such, the coolant to air filled in the radiator through the space formed between the plate 50 and the variable pressure sealing part 71 is stored in the reservoir tank through the through hole 72 formed at the coolant inlet 70 side. (Not shown).

The pressure in the radiator is gradually reduced by the operation of the pressure valve 40 as described above, and thus the sealing of the lower portion of the plate 50 as the plate 50 is lowered by the elasticity of the spring 42. The variable pressure sealing unit 71 is sealed by the unit 51.

FIG. 4B illustrates a volume of the coolant and air charged in the radiator as the temperature of the coolant and the air charged in the radiator decreases due to an engine stop or other reasons, so that the negative pressure is formed in the radiator. As shown in the drawing, the valve stem 61 installed through the plate 50 is lowered by the weight from the pressure inside the radiator to the through hole 72 and the radiator. The flow path is formed inside.

Accordingly, the coolant to air filled in the reservoir tank (not shown) through the flow path is introduced into the radiator through the through hole 72 formed at the side of the coolant inlet 70.

The pressure inside the radiator is increased by the operation of the negative pressure valve 60 as described above, and thus the valve stem 61 is raised again by the pressure inside the radiator to seal the portion 51 of the plate 50. Close to

Thus, the radiator is formed by integrally forming a sealing member 51 having a large deformation in a lower portion of the variable pressure sealing portion 71 of the cooling water injection port 70 and the plate 50 in contact with the end portion of the valve stem 61. There is an advantage that the function of the cap 10 is further improved.

In addition, the upper and lower length of the radiator cap 10 is shortened, the radiator formed of a long neck, as well as the radiator cap 10 is not exposed to the cooling water flow path 92 to inhibit the distribution of cooling water, or the impact of the cooling water flow As it is not received, it is possible to apply to a radiator with a short neck as shown in the drawing has the advantage that the application range is widened.

5 is a view showing the coupling of the radiator cap of the present invention, wherein the inner cap 30 that seals the upper opening of the coolant inlet 70 rotates separately from the outer cap 20, as referred to in the drawing. In the center of the gasket spring 31 supporting the gasket 33, a through hole 32 is formed, and a central portion of the outer cap 20 protrudes downward to be inserted into the through hole 32. The protrusion 21 is formed.

Accordingly, the protrusion 21 of the outer cap 20 is coupled to the upper surface of the link 41 which is installed through the through-hole of the gasket spring 31 to the lower side of the gasket spring 31 is coupled. .

Accordingly, the outer cap 20 and the link 41 are coupled to each other and interlocked, while the inner cap 30 composed of the gasket 33 and the gasket spring 31 is not coupled to the outer cap 20. If not, it rotates freely.

As such, the inner cap 30 including the gasket 33 and the gasket spring 31 rotates freely without interlocking with the outer cap 20, thereby fastening the radiator cap 10 to the cooling water inlet 70. Since the friction does not occur between the cooling water inlet 70 and the gasket 33 in the process, damage of the gasket 33 is prevented, and the coupling of the radiator cap 10 including the outer cap 20 is easier. Become.

In addition, as the outer cap 20 and the link 41 are directly coupled to each other without a separate fastener, the number of components is reduced, so that the manufacturing labor is reduced.

6 and 7 show a combination of another embodiment of the radiator cap of the present invention and the combination thereof, as shown in the drawing wherein the outer cap 20 is on top of the gasket spring 31 and the gasket spring. 31 is integrally formed with the upper portion of the link 41.

The inner cap 30 and the link 41 of the pressure valve 40 sealing the upper opening of the outer cap 20 and the cooling water inlet 70 to securely fix the radiator cap 110 are provided. The overall durability of the radiator cap 10 of the present invention is improved by being firmly coupled to each other, and the outer cap 20 and the inner cap 30 and the link 41 are combined without a separate fastener, so that the number of components It is possible to further improve the manufacturability, such as the decrease in manufacturing time.

8 is a flow chart showing the manufacturing method of the radiator cap of the present invention, as shown in the drawing, the radiator cap 10 of the present invention includes a plate double injection step (S1), a negative pressure valve assembly step (S2), and an outer Cap and gasket spring and link coupling step (S3), and plate assembly step (S4); is manufactured through.

The plate double injection step (S1) is a step of double injection so that the sealing portion 51 freely deformed under the plate 50 is integrally formed, the plate 50 through the plate double injection step (S1). The upper portion of the upper portion has a predetermined rigidity and a sealing portion 51 having elasticity at the lower portion thereof, thereby improving sealing performance.

The negative pressure valve 60 is assembled to the plate 50 formed through the double injection step S1 through the negative pressure valve assembling step S2, and is fixed to the outside of the cooling water inlet 70. Gaskets 33 for sealing the upper opening of the cooling water inlet 70, gasket springs 31 for elastically supporting the gaskets 33, and links 41 having springs 42 disposed therein. The outer cap 20, the gasket spring 31 and the link 41 are coupled to each other through an outer cap and a gasket spring and a link coupling step S3 to be coupled, and then the link through the plate assembly step S4. The plate 50 in which the spring 42 and the negative pressure valve 60 are assembled is assembled inside the 41 to complete the radiator cap 10.

The terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms and the inventor may appropriately define the concept of the term in order to best describe its invention It should be construed as meaning and concept consistent with the technical idea of the present invention. Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiments of the present invention and do not satisfy all of the technical idea of the present invention, various equivalents that may be substituted for them at the time of the present application It should be understood that there may be variations and variations.

1 is a perspective view showing a general radiator.

Figure 2 is a cross-sectional view showing a conventional radiator cap and its operation.

Figure 3 is a cross-sectional view showing a conventional radiator cap and its operation.

Figure 4 is a cross-sectional view showing the radiator cap and its operation of the present invention.

5 is an exploded cross-sectional view showing a radiator cap of the present invention.

6 is a cross-sectional view showing another embodiment of the radiator cap of the present invention.

Figure 7 is an exploded cross-sectional view showing another embodiment of the radiator cap of the present invention.

8 is a flow chart showing a manufacturing method of the radiator cap of the present invention.

Description of the Related Art [0002]

10: radiator cap

20: outer cap 21: protrusion

30: inner cap 31: gasket spring

32: through hole 33: gasket

40: pressure valve 41: link

42: spring 43: fixing part

50: plate 51: sealing part

52: jamming jaw

60: negative pressure valve 61: valve stem

62: stop ring

70: coolant inlet 71: variable pressure sealing portion

72: through

190: radiator 191: header tank

192: coolant flow path

Claims (4)

An outer cap 20 fixed to the outside of the radiator cooling water inlet; Inner cap 30 composed of a gasket spring 31 installed below the outer cap 20 and a gasket 33 elastically supported by the gasket spring 31 to seal an upper opening of the cooling water inlet 70. )and; An upper portion of the link 41 provided below the inner cap 30, the spring 42 provided inside the link 41, and the variable pressure sealing portion 71 formed in the cooling water inlet 70. It is composed of a plate 50 is double injection of the sealing portion 51 having an elasticity on the lower surface to seal the cooling water inlet 70 in contact with the spring, the spring 42 between the link 41 and the plate 50 And a portion of the plate 50 is inserted into the inner circumference of the link 41 so that the plate 50 flows up and down along the inner circumference of the link 41. A pressure valve 40 formed to be caught and fixed to an inner circumferential lower end of the link 41; And a negative pressure valve 60 installed to flow up and down on the pressure valve 40 to open and close a flow path communicating with a through hole 72 formed at a side of the cooling water inlet 70. Radiator cap made with. The method of claim 1, The outer cap 20 is formed with a protrusion 21 so that a portion of the center penetrates through the gasket spring 31 and is coupled to the upper surface of the link 41, and the gasket spring 31 is the protrusion 21. Radiator cap, characterized in that the through-hole 32 is formed to be inserted into the rotation. The method of claim 1, The outer cap (20) is coupled to the top of the gasket spring (31), the gasket spring (31) is coupled to the top of the link (41) radiator cap, characterized in that formed integrally. Plate double injection step (S1) for double-injection so that the sealing portion 51 is integrated in the lower portion of the plate 50 in contact with the cooling water inlet 70 and the negative pressure valve (60); A negative pressure valve assembly step (S2) of assembling a negative pressure valve 60 to the double ejected plate 50; A gasket 33 for sealing an upper opening of the coolant inlet 70 to an outer cap 20 fixed to the outside of the coolant inlet 70 and a gasket spring 31 for elastically supporting the gasket 33. And an outer cap and a gasket spring and link coupling step (S3) for coupling a link 41 having a spring 42 disposed therein; And a plate assembly step (S4) of assembling the plate 50 in which the spring 42 and the negative pressure valve 60 are assembled in the link 41; and manufacturing a cap of a radiator .

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