JP2020026858A - Thermostat device - Google Patents

Abstract

To provide a thermostat device which enables improvement of warming-up performance, reduction of assembly work hours, and improvement of a work environment.SOLUTION: A thermostat device 1 to which the invention is applied includes: a valve seat part 2 formed with an opening 21; a piston shaft 3 penetrating through the opening 21; a support frame 4 fixed to the valve seat part 2 and supporting one end part 3a of the piston shaft 3; a movable part 5 which is stored in the piston shaft 3 at the other end part, can be moved in an axial direction C of the piston shaft 3 by volumetric change of a thermal expansion body incorporated thereinto, and opens or closes the opening 21; an attachment frame 6 which is fixed to the movable part 5, can move in the axial direction C of the piston shaft 3 with the movable part 5, and is spaced apart from the valve seat part 2; and a biasing part 7 which is provided between the valve seat part 2 and the attachment frame 6 and biases in a manner that the valve seat part 2 and the attachment frame 6 are pushed to spread.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a thermostat device.

  Conventionally, a thermostat device used in a cooling circuit for cooling an engine of an automobile or the like and automatically controlling the temperature of the coolant by operating according to a temperature change of the coolant circulated in the cooling circuit is disclosed in Patent Document 1. Is disclosed.

  The thermostat device disclosed in Patent Literature 1 includes a valve seat having a tubular valve seat portion provided with a valve port inside, a horizontal valve seat portion provided in a flange shape from the cylindrical valve seat portion, and a valve port. A support frame whose both ends are fixed on a horizontal valve seat portion straddling the upper side, a piston shaft whose upper end is supported at the center side of the support frame, and a lower end side of the piston shaft are housed, and the built-in heat is stored therein. A temperature-sensitive movable body provided so as to be movable in the vertical direction by expansion or contraction of the expandable body, and a tubular valve of a valve seat which is provided integrally with the temperature-sensitive movable body and moves according to the movement of the temperature-sensitive movable body. A valve body that opens and closes a valve port by being brought into contact with and separated from the inner peripheral surface of the seat.

  According to the thermostat device disclosed in Patent Document 1, when the temperature of the coolant is lower than a predetermined temperature, the valve body and the valve seat are closed. When the coolant temperature rises above a predetermined temperature, the temperature-sensitive movable body moves together with the valve body, and the valve body and the valve seat are opened. This makes it possible to control the coolant temperature.

  However, the thermostat device disclosed in Patent Literature 1 includes a main spring that is provided between the main valve body and the frame and urges the main valve body to press against the main valve seat. The frame receiving the urging force of the main spring is directly fixed to the main valve seat by peening. Since this peening is directly fixed to the main valve seat by applying an impact to the metal constituting the frame and gradually deforming it, even if the main valve body and the main valve seat are in the closed state, the peening There has been a problem that the coolant leaks from between the fixed frame and the main valve seat, and as a result, the warming performance of an automobile or the like is reduced. Also, in the peening operation, the frame is gradually fixed to the main valve seat by being gradually deformed, so that there is a problem that much time is required for assembling the thermostat device. In addition, there is a problem that the working environment is deteriorated by noise and dust generated by the peening operation.

JP 2010-84743 A

  Accordingly, the present invention has been devised in view of the above-described problems, and has as its object to improve the warm-up performance, shorten the assembly work time, and An object of the present invention is to provide a thermostat device capable of improving the environment.

  A thermostat device according to a first aspect of the present invention includes a valve seat having an opening, a piston shaft penetrating the opening, and a support frame fixed to the valve seat and supporting one end of the piston shaft. A movable section that houses the other end of the piston shaft, and moves in the axial direction of the piston shaft by changing the volume of the built-in thermal expansion body to open and close the opening; The mounting frame is fixed to the movable portion and is movable in the axial direction of the piston shaft together with the movable portion, and is provided between the valve seat portion and the mounting frame, which is separated from the valve seat portion. And an urging portion for urging the mounting frame so as to push it apart.

  A thermostat device according to a second invention is characterized in that in the first invention, one side and the other side of the valve seat communicate with each other with the valve seat interposed only in the opening.

  In the thermostat device according to a third invention, in the first invention or the second invention, the valve seat portion has a covering portion made of a synthetic resin, and the covering portion is formed in an annular shape, and is formed from an outer peripheral portion to an inner portion. It is characterized in that the peripheral part is formed integrally.

  A thermostat device according to a fourth invention is characterized in that, in any one of the first invention to the third invention, the urging portion is disposed on the opposite side of the movable portion with the valve seat portion interposed therebetween.

  A thermostat device according to a fifth invention is characterized in that, in any one of the first invention to the fourth invention, the urging portion is a coil spring, and the mounting frame is disposed inside the coil spring. I do.

  A thermostat device according to a sixth invention is characterized in that, in the fifth invention, the urging portion is a conical coil spring whose diameter increases as the coil diameter approaches the valve seat portion.

  The thermostat device according to a seventh invention is the thermostat device according to the fifth invention or the sixth invention, wherein the attachment frame has an attachment portion formed to extend in an axial direction of the piston shaft, and a base end side of the attachment portion is It is characterized by having a locking part fixed to the movable part and locking the urging part at the tip of the mounting part.

  The thermostat device according to an eighth invention is characterized in that, in the seventh invention, the locking portion is formed by folding a metal plate in an axial direction of the piston shaft.

  The thermostat device according to a ninth invention is the thermostat device according to the eighth invention, wherein the mounting portion is formed by being bent along a slit extending in an axial direction of the piston shaft formed on a tip end side, and is formed on both sides of the slit. It is characterized in that it has a pair of locking portions.

  According to the first to ninth aspects, the mounting frame is not directly fixed to the valve seat by peening or the like. Therefore, when the opening is closed by the opening / closing portion, it is possible to prevent the coolant from leaking from one side to the other side across the valve seat portion, thereby improving the warm-up performance of the vehicle. Becomes

  Further, according to the first to ninth aspects, since the mounting frame is not directly fixed to the valve seat, there is no need to perform a peening operation. For this reason, it is possible to shorten the assembling work time and improve the working environment.

  In particular, according to the second aspect, the flow path through which the coolant flows from one side to the other side across the valve seat is only the opening. Therefore, when the opening is closed by the opening / closing portion, it is possible to firmly prevent the coolant from leaking from one side to the other side across the valve seat portion, and further improve the warm-up performance of the vehicle. It becomes possible.

  In particular, according to the third aspect, even if the covering portion is provided, the peening portion is not formed, so that it is not necessary to increase the size of the covering portion to avoid the peening portion. For this reason, it is possible to reduce the size of the entire thermostat device. In addition, since the covering portion is formed integrally from the outer peripheral portion to the inner peripheral portion, it is possible to reduce the assembly work time.

  In particular, according to the fourth aspect, the urging portion is not disposed around the movable portion. Therefore, even after assembly, the volume of the movable part can be finely adjusted, and an indentation operation for adjusting the amount of movement of the movable part can be performed. As a result, it is possible to adjust the moving amount of the movable portion with respect to the temperature change with high accuracy.

  In particular, according to the fifth aspect, the mounting frame can be inserted into the compressed coil spring, and the installation work of the coil spring can be performed in a short time. For this reason, it is possible to reduce the assembly work time.

  In particular, according to the sixth aspect, the work of inserting the mounting frame into the compressed coil spring can be performed more easily, and the work of installing the coil spring can be performed in a shorter time. For this reason, it is possible to reduce the assembly work time.

  In particular, according to the seventh aspect, the distal end portion is deformed with the base end side of the mounting portion as a base point, the mounting portion is inserted into the opening, and the deformed distal end portion is inserted after the mounting portion is inserted. The side can be replaced. For this reason, the fixing operation of the valve seat can be performed in a short time. Also, after deforming the distal end side with the base end side of the mounting part as a base point, insert the mounting part inside the coil spring, insert the mounting part, and then return the deformed distal end side to the original The coil spring can be locked to the locking portion. Therefore, the installation work of the coil spring can be performed in a shorter time. As a result, it is possible to reduce the assembly work time

  In particular, according to the eighth aspect, the locking portion can be folded so that the coil spring can be sandwiched by the metal plates arranged in parallel with each other. For this reason, it is possible to suppress the rotation of the coil spring in the circumferential direction.

  In particular, according to the ninth aspect, a force that expands mutually acts on the pair of locking portions, and this force is transmitted to the coil spring. Thereby, the locking portion can firmly hold the coil spring. For this reason, the effect of suppressing the coil spring from rotating in the circumferential direction can be further enhanced.

It is a figure showing the housing in which the thermostat device to which the present invention is applied is installed. (A) is a figure which shows a valve seat part and a support frame, (b) is the figure which looked at (a) from the arrow E direction in the figure. It is a figure which expands and shows the vicinity of a mounting frame. (A) is a perspective view showing the vicinity of the distal end of the mounting portion, and (b) is a cross-sectional view taken along line DD of (a). It is a figure which shows the attachment frame fixing process which fixes an attachment frame to a movable part. It is a figure which shows the valve seat part attaching process which attaches a valve seat part to a movable part. It is a figure which shows the urging part installation process which provides an urging part between a valve seat part and a mounting frame. It is a figure showing the valve-open state of the thermostat device to which the present invention is applied. It is a figure showing a modification of a movable part.

  Hereinafter, embodiments for implementing a thermostat device to which the present invention is applied will be described in detail with reference to the drawings.

  FIG. 1 is a diagram showing a housing 9 in which a thermostat device 1 to which the present invention is applied is installed. FIG. 2A is a diagram showing the valve seat portion 2 and the support frame 4, and FIG. 2B is a diagram of FIG. 2A viewed from the direction of arrow E in the drawing.

  The thermostat device 1 to which the present invention is applied is used in a cooling circuit that cools an engine of an automobile or the like, and automatically controls a coolant temperature by operating according to a change in temperature of the coolant circulated in the cooling circuit. The cooling circuit is configured such that an engine as an internal combustion engine, a radiator for cooling a coolant, and a housing 9 in which the thermostat device 1 according to the present invention is disposed are connected by a flow path. The cooling circuit is configured to circulate the coolant in the engine, the radiator, the housing 9 and the respective flow paths connecting these components through driving of a pump or the like.

  As shown in FIG. 1, the housing 9 includes a radiator connection portion 9a connected to a flow passage connected to the radiator, an engine connection portion 9b connected to a flow passage connected to the engine, and a bypass of the radiator in the cooling circuit. And a bypass connection portion 9c connected to the flow path. The radiator connection portion 9a is provided at an upper portion of the housing 9, and the bypass connection portion 9c is provided at a lower portion of the housing 9, which is a side substantially opposite to the radiator connection portion 9a. The engine connection part 9 b is provided on a side part of the housing 9. The housing 9 is configured to allow the coolant flowing from the radiator connection portion 9a and the bypass connection portion 9c to flow toward the engine connection portion 9b.

  The thermostat device 1 to which the present invention is applied includes a valve seat portion 2, a piston shaft 3, a support frame 4, a movable portion 5, a mounting frame 6, and a biasing portion 7.

  The valve seat 2 is made of an annular metal plate, and has a circular opening 21 substantially at the center. One side A and the other side B of the valve seat 2 communicate with each other only through the opening 21 with the valve seat 2 interposed therebetween. The valve seat part 2 has a covering part 22 formed in an annular shape. The covering portion 22 is made of synthetic resin such as rubber which is vulcanized and bonded to the valve seat portion 2. The covering portion 22 has an outer peripheral portion 22a that covers the outer periphery of the valve seat portion 2 and an inner peripheral portion 22b that forms an annular inner peripheral surface. The outer peripheral portion 22a of the covering portion 22 is closely attached to the side portion of the housing 9 without a gap. The covering part 22 has an inner peripheral part 22 b disposed between the valve seat part 2 and the movable part 5. The covering part 22 is formed integrally from the outer peripheral part 22a to the inner peripheral part 22b. In the embodiment shown in FIG. 1, the coating portion 22 is formed such that the inner diameter of the inner peripheral portion 22 b is larger than the diameter of the opening portion 21. In the present invention, the coating portion 22 is formed such that the inner peripheral portion 22 b has an annular shape. The inner periphery of the valve seat 2 may be covered, and the opening 21 may be formed by the inner periphery 22b.

  As the piston shaft 3, a metal rod-shaped member extending in the axial direction C is used, and is penetrated through the opening 21. One end 3 a of the piston shaft 3 in the axial direction C is supported by the support frame 4.

  The support frame 4 is disposed across the opening 21, and both ends of the support frame 4 are fixed to the valve seat 2. The support frame 4 is made of metal, and is fixed integrally with the valve seat 2. The support frame 4 has a support portion 41 at the center. The support portion 41 is formed in a substantially cylindrical shape with an upper end closed and an open lower end, and the one end 3a of the piston shaft 3 is fitted and supported.

  The movable part 5 is formed in a cylindrical shape, one end 5a is opened, and the other end 5b is closed. The movable portion 5 houses the other end of the piston shaft 3 and incorporates a thermal expansion body. As the thermal expansion body, wax or the like that thermally expands and contracts according to the temperature change of the coolant flowing outside the movable portion 5 is used. The movable portion 5 is movable in the axial direction C of the piston shaft 3 when the volume of the thermal expansion body changes due to thermal expansion and thermal contraction. The movable section 5 has an opening / closing section 51 for opening and closing the opening 21. The movable portion 5 is provided such that an opening / closing portion 51 is integrated with one end portion 5a. The movable portion 5 is provided with a caulking portion 52 at one end 5a.

  The mounting frame 6 is formed by bending a metal plate into a U-shape, and is separated from the valve seat 2. The mounting frame 6 is fixed to the movable portion 5 and is movable together with the movable portion 5 in the axial direction C of the piston shaft 3. The mounting frame 6 has a pair of mounting portions 61, 61 and a connecting portion 62 that connects the pair of mounting portions 61, 61.

  FIG. 3 is an enlarged view showing the vicinity of the mounting frame 6. FIG. 4A is a perspective view showing the vicinity of the distal end portion 61b of the mounting portion 61, and FIG. 4B is a cross-sectional view taken along the line DD of FIG. 4A.

  The mounting portion 61 is formed to extend in the axial direction C of the piston shaft 3. The mounting portion 61 is fixed to one end 5a of the movable portion 5 via a connecting portion 62 provided on the base end 61a side of the mounting portion 61. The distal end portion 61 b of the attachment portion 61 has a locking portion 63 formed by being folded back in the axial direction C of the piston shaft 3. The locking portion 63 locks the urging portion 7. The locking portion 63 is formed by folding a metal plate in the axial direction C of the piston shaft 3. The support frame 4 is disposed between the pair of mounting portions 61.

  The connecting portion 62 has a circular through-hole 62 a through which the piston shaft 3 penetrates, and is fixed to the one end 5 a of the movable portion 5 via the caulking portion 52.

  As shown in FIG. 4A, the mounting portion 61 is formed by being bent along a slit 64 formed in the distal end portion 61b and extending in the axial direction C, and a pair of locking portions is provided on both sides of the slit 64. 63, 63. As shown in FIG. 4B, the pair of locking portions 63 are arranged to be inclined by an angle θ from each other. At this time, a force (a force in the direction of the arrow R in the drawing) that spreads between the pair of locking portions 63 and 63 acts, and this force is transmitted to the coil spring 71 as the urging portion 7.

  As shown in FIG. 3, for example, the urging portion 7 uses a conical coil spring 71, and the coil diameter D increases as the coil diameter D approaches the valve seat portion 2. The urging portion 7 is provided between the valve seat portion 2 and the mounting frame 6 and urges the valve seat portion 2 and the mounting frame 6 so as to push them apart. The mounting frame 6 is arranged inside the coil spring 71. Note that a cylindrical coil spring 71 may be used as the urging portion 7.

  Next, a method for assembling the thermostat device 1 to which the present invention is applied will be described.

  FIG. 5 is a diagram illustrating a mounting frame fixing step of fixing the mounting frame 6 to the movable portion 5. When assembling the thermostat device 1 to which the present invention is applied, as shown in FIG. 5A, the process is started from a state in which the piston shaft 3 is housed in the movable portion 5 in which the thermal expansion body is built.

  Then, as shown in FIG. 5B, a mounting frame fixing step of fixing the mounting frame 6 to one end 5a of the movable portion 5 is performed. In the mounting frame fixing step, the piston shaft 3 and the caulking portion 52 formed in a cylindrical shape are made to pass through a through hole 62 a formed in the connecting portion 62 of the mounting frame 6. Then, in the mounting frame fixing step, the upper end of the caulking portion 52 is expanded with a tool or the like, and the connecting portion 62 is fixed to the one end 5a of the movable portion 5 via the caulking portion 52.

  FIG. 6 is a view showing a valve seat part attaching step of attaching the valve seat part 2 to the movable part 5. After the attachment frame fixing step, a valve seat part attaching step of attaching the valve seat part 2 to the movable part 5 is performed. In the valve seat mounting step, a pair of mounting portions 61 of the mounting frame 6 are passed through the opening 21 of the valve seat 2. In the valve seat portion attaching step, as shown in FIG. 6A, the pair of attaching portions 61, 61 such that the distal end portions 61 b of the pair of attaching portions 61 are closer to each other (in the direction of arrow M in the drawing) with the base end portion 61 a as a base point. It is deformed by the operator's finger or the like. Then, in the valve seat mounting step, the pair of mounting portions 61 in such a state is passed through the opening 21 of the valve seat 2. Thereby, the mounting portion 61 can be easily penetrated through the opening 21. The valve seat 2 is provided with a cover 22 formed by vulcanizing and bonding rubber in advance.

  Then, in the valve seat portion attaching step, as shown in FIG. 6B, after the attaching portion 61 is made to penetrate through the opening portion 21, the tip portions 61b, 61b that have been deformed so as to approach each other are restored. In the valve seat mounting step, the piston shaft 3 is fitted and supported in the support 41 of the support frame 4 which is integrated and fixed to the valve seat 2. At this time, a pair of mounting portions 61 are arranged on both sides of the support frame 4. Further, the opening / closing section 51 is brought into contact with the valve seat section 2 and the opening section 21 is in a valve closed state.

  FIG. 7 is a diagram illustrating an urging portion installation step of providing the urging portion 7 between the valve seat portion 2 and the mounting frame 6. After the valve seat mounting step, an urging section setting step of providing the urging section 7 between the valve seat 2 and the mounting frame 6 is performed. In the urging unit setting step, as shown in FIG. 7A, the urging force is applied to the coil spring 71 as the urging unit 7 by the operator's finger or a predetermined machine in the direction of arrow F in the drawing. By compressing, the coils are brought into close contact with each other in the axial direction C. Then, in the urging portion setting step, the pair of mounting portions 61 are inserted through the coil spring 71 in such a state. Thereby, the attaching portion 61 can be easily inserted into the coil spring 71 without the engaging portion 63 of the attaching portion 61 being caught between the coils of the coil spring 71.

  Further, in the urging portion setting step, the pair of attachment portions 61, 61 are deformed by the operator's finger or the like so that the tip portions 61b of the pair of attachment portions 61 are closer to each other (in the direction of arrow M in the drawing) with the base end portion 61a as a base point. State. Then, in the urging portion setting step, the pair of mounting portions 61 are inserted through the coil spring 71 in such a state. Thereby, the mounting portion 61 can be easily inserted into the inside of the coil spring 71.

  Then, in the urging portion setting step, the coil spring 71 is brought into contact with the covering portion 22 of the valve seat 2 as shown in FIG. In the urging portion installation step, the distal end portions 61b, 61b that have been deformed so as to approach each other are returned to the original positions. Then, the coil spring 71 is locked to the locking portion 63. At this time, although the coils of the coil spring 71 in close contact with each other are slightly separated from each other, an urging force is applied to the coil spring 71 to push the valve seat 2 and the mounting frame 6 apart. Further, the coil spring 71 is arranged on the opposite side of the movable portion 5 with the valve seat portion 2 interposed therebetween.

  Thus, the assembly of the thermostat device 1 to which the present invention is applied is completed.

  Next, the operation of the thermostat device 1 according to the present invention will be described.

  In the cooling circuit, when the temperature of the coolant is lower than a predetermined temperature, the thermostat device 1 installed in the housing 9 has the valve seat 2 in contact with the opening / closing portion 51 of the movable portion 5 as shown in FIG. The opening 21 is closed by the opening / closing section 51.

  Then, when the liquid temperature of the cooling liquid rises to a predetermined temperature, in the thermostat device 1, as shown in FIG. 8, the thermal expansion body built in the movable section 5 thermally expands and changes its volume. At this time, the opening / closing part 51 of the movable part 5 moves in the direction of arrow P in the figure while resisting the urging force of the coil spring 71. Thereby, the opening / closing part 51 of the movable part 5 is separated from the opening 21 of the valve seat part 2, and the opening 21 is opened. For this reason, a low-temperature coolant flows from the radiator connection portion 9a, passes from the one side A of the valve seat portion 2 through the opening 21 of the valve seat portion 2, and from the bypass connection portion 9c to the other side B of the valve seat portion 2. Is mixed with the high-temperature coolant, and the appropriate coolant is discharged to the engine connecting portion 9b.

  When the temperature of the cooling liquid drops, the thermal expansion body built in the movable part 5 thermally contracts. At this time, the movable portion 5 is moved in the direction of arrow Q in the drawing by the urging force of the coil spring 71. When the opening / closing section 51 contacts the opening 21, the opening 21 of the movable section 5 is closed by the opening / closing section 51.

  With such an operation, the thermostat device 1 according to the present invention detects the temperature of the mixture of the high-temperature coolant and the low-temperature coolant from the radiator, and adjusts the temperature of the coolant supplied to the engine. It can be controlled to maintain a constant temperature.

  According to the present invention, the mounting frame 6 which is separated from the valve seat portion 2 and fixed to the movable portion 5 is provided between the valve seat portion 2 and the mounting frame 6, and the valve seat portion 2 and the mounting frame 6 And an urging portion 7 for urging the pressure to spread. Accordingly, the mounting frame 6 is not directly fixed to the valve seat portion 2, and there is no need to perform a peening operation. Therefore, when the opening 21 is closed by the opening / closing portion 51, it is possible to prevent the coolant from leaking from the one side A to the other side B with the valve seat portion 2 interposed therebetween, thereby improving the warm-up performance of the automobile. It can be improved.

  Further, according to the present invention, the mounting frame 6 is not directly fixed to the valve seat portion 2, and there is no need to perform a peening operation. For this reason, it is possible to reduce the assembly work time. Further, since noise and dust generated by the peening operation can be prevented, the working environment can be improved.

  In particular, according to the present invention, one side A and the other side B of the valve seat 2 communicate with each other with the valve seat 2 interposed only in the opening 21. Thus, only the opening 21 has a flow path through which the coolant flows from one side A to the other side B with the valve seat 2 interposed therebetween. Therefore, when the opening 21 is closed by the opening / closing portion 51, it is possible to firmly prevent the coolant from leaking from the one side A to the other side B with the valve seat portion 2 interposed therebetween, and to warm up the automobile. The performance can be further improved.

  Here, in the conventional thermostat device in which the peening portion is formed, an annular rubber packing that fills a gap with the housing, and a rubber seal that fills a gap with an opening / closing portion that closes the opening are formed so as to avoid the peening portion. Had to be provided. For this reason, in the conventional thermostat device, the rubber packing and the rubber seal need to be formed as separate members, and these cannot be integrated. As a result, in the conventional thermostat device, the rubber packing had to be increased in order to avoid the peening portion, and the size of the entire device could not be reduced. Further, since the rubber packing and the rubber seal are separately provided, much time is required for assembling.

  On the other hand, according to the present invention, the valve seat portion 2 has the covering portion 22 made of a synthetic resin, and the covering portion 22 is formed in an annular shape, and extends from the outer peripheral portion 22a to the inner peripheral portion 22b. It is formed integrally. Thus, even if the covering portion 22 is provided, the peening portion is not formed, so that it is not necessary to increase the size of the covering portion 22 to avoid the peening portion. For this reason, it is possible to reduce the size of the entire thermostat device 1. In addition, since the covering portion 22 is formed integrally from the outer peripheral portion 22a to the inner peripheral portion 22b, it is possible to reduce the assembly work time.

  Here, in the thermostat device, an indentation operation is performed in which the volume of the movable portion itself in which the thermal expansion body is built is finely adjusted, and the moving amount is adjusted according to the temperature. In the conventional thermostat device, since the urging portion is arranged around the movable portion, even if an attempt is made to finely adjust the volume of the movable portion, it is hindered by the urging portion. For this reason, the conventional thermostat device could not perform the indentation operation for adjusting the movement amount after the assembly. As a result, the movement amount with respect to the temperature change could not be adjusted with high accuracy.

  On the other hand, according to the present invention, the urging portion 7 is arranged on the opposite side of the movable portion 5 with the valve seat portion 2 interposed therebetween. Thereby, the urging portion 7 is not disposed around the movable portion 5. Therefore, even after assembly, the volume of the movable part 5 can be finely adjusted, and an indentation operation for adjusting the amount of movement of the movable part 5 can be performed. As a result, it is possible to adjust the moving amount of the movable section 5 with respect to the temperature change with high accuracy.

  According to the present invention, the urging portion 7 is the coil spring 71, and the mounting frame 6 is disposed inside the coil spring 71. Thereby, the mounting frame 6 can be inserted inside the compressed coil spring 71, and the installation work of the coil spring 71 can be performed in a short time. For this reason, it is possible to reduce the assembly work time.

  According to the present invention, the urging portion 7 is a conical coil spring 71 whose diameter increases as the coil diameter approaches the valve seat portion 2. Accordingly, the work of inserting the mounting frame 6 into the compressed coil spring 71 can be performed more easily, and the work of installing the coil spring 71 can be performed in a shorter time. For this reason, it is possible to reduce the assembly work time.

  According to the present invention, the mounting frame 6 has the mounting portion 61 formed to extend in the axial direction C of the piston shaft 3, and the base end 61 a side of the mounting portion 61 is fixed to the movable portion 5, A locking portion 63 for locking the urging portion 7 is formed at the distal end portion 61b of the head. Thereby, after deforming the distal end portion 61b side with the base end portion 61a side of the mounting portion 61 as a base point, the mounting portion 61 is inserted into the opening 21 and the deformed distal end portion is inserted after the mounting portion 61 is inserted. The 61b side can be restored. For this reason, the fixing work of the valve seat 2 can be performed in a short time. Further, after deforming the distal end portion 61b side with the base end portion 61a side of the mounting portion 61 as a base point, the mounting portion 61 is inserted into the inside of the coil spring 71, and after the mounting portion 61 is inserted, the deformed distal end is formed. The coil spring 71 can be locked on the locking portion 63 by returning the portion 61b to the original position. For this reason, the installation work of the coil spring 71 can be performed in a shorter time. As a result, it is possible to reduce the assembly work time

  According to the present invention, the locking portion 63 is formed by folding a metal plate in the axial direction C of the piston shaft 3. Accordingly, the locking portion 63 can sandwich the coil spring 71 by the metal plates arranged in parallel with each other by being folded back. Therefore, it is possible to prevent the coil spring 71 from rotating in the circumferential direction.

  In particular, according to the present invention, the mounting portion 61 is formed by being bent along a slit 64 extending in the axial direction C of the piston shaft 3 formed on the distal end portion 61 b side, and a pair of It has locking parts 63, 63. At this time, as shown in FIG. 4B, a force (a force in a direction indicated by an arrow R in the drawing) acting on the pair of locking portions 63 and 63 acts on the coil spring 71. Is transmitted. Thereby, the locking portion 63 can firmly hold the coil spring 71. Therefore, the effect of suppressing the rotation of the coil spring 71 in the circumferential direction can be further enhanced.

  FIG. 9 is a diagram illustrating a modification of the movable unit 5. In the above-described embodiment, the form in which the opening / closing part 51 is provided integrally with the one end part 5a of the movable part 5 is shown. However, as shown in FIG. It may be provided as a member. At this time, an annular plate or the like is used for the opening / closing section 51. The opening / closing section 51 may be abutted on the connecting section 62 of the mounting frame 6 and fixed to the one end 5 a of the movable section 5 via the caulking section 52. Since the opening / closing section 51 is provided as a separate member at one end 5 a of the movable section 5, the outer diameter of the opening / closing section 51 can be appropriately adjusted according to the inner diameter of the opening 21.

  As described above, the example of the embodiment of the present invention has been described in detail. However, each of the above-described embodiments is merely an example of the embodiment for carrying out the present invention. The scope should not be construed as limiting.

1: Thermostat device 2: Valve seat 21: Opening 22: Covering portion 22a: Outer periphery 22b: Inner periphery 3: Piston shaft 3a: One end 4: Support frame 5: Movable portion 5a: One end 5b: Other end Part 51: Opening / closing part 52: Caulking part 6: Mounting frame 61a: Base end part 61b: Tip part 62: Connecting part 62a: Through hole 63: Locking part 64: Slit 7: Urging part 71: Coil spring 9: Housing 9a: radiator connection 9b: engine connection 9c: bypass connection A: one side B: the other side C: axial direction D: coil diameter

Claims (9)

A valve seat where an opening is formed,
A piston shaft penetrated through the opening,
A support frame fixed to the valve seat and supporting one end of the piston shaft;
A movable portion that houses the other end of the piston shaft, moves in the axial direction of the piston shaft by changing the volume of the built-in thermal expansion body, and opens and closes the opening,
An attachment frame fixed to the movable portion, movable in the axial direction of the piston shaft together with the movable portion, and separated from the valve seat portion;
A thermostat device, comprising: an urging portion provided between the valve seat portion and the mounting frame, for urging the valve seat portion and the mounting frame so as to push them apart. 2. The thermostat device according to claim 1, wherein one side and the other side of the valve seat communicate with each other only through the opening with the valve seat interposed therebetween. 3. The valve seat has a covering portion made of a synthetic resin,
3. The thermostat device according to claim 1, wherein the covering portion is formed in an annular shape, and is formed integrally from an outer peripheral portion to an inner peripheral portion. 4. The thermostat device according to any one of claims 1 to 3, wherein the urging portion is disposed on a side opposite to the movable portion with the valve seat portion interposed therebetween. The urging portion is a coil spring,
The thermostat device according to any one of claims 1 to 4, wherein the mounting frame is disposed inside the coil spring. The thermostat device according to claim 5, wherein the urging portion is a conical coil spring whose diameter increases as the coil diameter approaches the valve seat portion. The mounting frame has a mounting portion extending in the axial direction of the piston shaft, a base end side of the mounting portion is fixed to the movable portion, and the urging portion is provided at a distal end of the mounting portion. The thermostat device according to claim 5, further comprising a locking portion for locking. The thermostat device according to claim 7, wherein the locking portion is formed by folding a metal plate in an axial direction of the piston shaft. The attachment portion is formed by being bent along a slit formed on the distal end side and extending in the axial direction of the piston shaft, and has a pair of the locking portions on both sides of the slit. Item 9. The thermostat device according to item 8.

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