JP4921955B2 - Thermostat device - Google Patents

Description

  The present invention relates to a thermostat device that mainly controls the temperature of coolant of an engine such as an automobile.

  As a prior art, Patent Document 1 discloses an invention of a vehicle cooling device (thermostat device).

  This thermostat device 3 has a main valve wake chamber 23 (mixing section) in which high temperature coolant A that has been cooled to a high temperature by cooling the engine and low temperature coolant C that has been cooled by a radiator and cooled to a low temperature flow in and mix. The radiator-side coolant flow path section (the chamber in which the guide section 27 exists) is formed in the upper portion of the main valve wake chamber 23 and flows in the low-temperature coolant C and flows out the C into the main valve wake chamber 23. ), A temperature-sensing greenhouse (the uppermost part of the temperature-sensing channel portion 21) in which the high-temperature coolant A formed at the upper portion of the radiator-side coolant channel portion flows in and flows out of the A to the main valve downstream chamber 23; And a shielding part (part having a guide part 27) that is fixed to the housing 18 and that completely blocks the radiator-side coolant flow path part and forms a temperature sensitive room into which only the high-temperature coolant A flows. , The inside upper part of the greenhouse A wax part insertion support part (temperature-sensitive part insertion part) in which the housing 18 is formed concavely, a guide part 27 that supports the piston 26 part provided on the radiator side coolant flow path part side of the shielding part, A frame 33 for supporting and guiding the main shaft 28 provided below the valve wake chamber 23 (mixing portion) and a wax 25a (thermal expansion / contraction portion) that expands and contracts depending on the temperature of the high-temperature coolant A. ), A thermo element 24 (temperature-sensitive movable part) composed of a piston 26 movable by the operation of the temperature-sensing part, a main shaft 28 supported at the tip of the piston 26, and a radiator side coolant flow A main valve opening formed between the passage portion and the mixing portion, and a low-temperature coolant supplied from the radiator-side coolant flow passage portion to the mixing portion provided above the main shaft 28 A main valve 29 that regulates the inflow amount of the main valve opening by controlling the opening amount of the main valve port, a return spring 37 provided between the main valve 29 and the frame 33 so as to urge the 29 upward, The heater 24a forcibly heats the wax 25a (thermal expansion / contraction part) of the thermo element 24 (temperature-sensitive movable part) by supplying power.

  When the temperature of the high-temperature coolant A rises, the temperature-sensitive portion wax 25a (thermal expansion / contraction member) expands and moves the piston 26 and the main shaft 28 downward against the pressing force of the return spring 37. The main valve 29 moves downward integrally with the downward movement of the shaft 28 to increase the outflow of the low temperature cooling liquid C from the radiator side cooling liquid flow path portion to the main valve downstream chamber 23 (mixing portion), thereby increasing the high temperature cooling liquid. When the temperature of A decreases, the wax 25a (thermal expansion / contraction member) contracts, and the main shaft 28, the main valve 29, and the piston 26 are moved upward by the pressing force of the return spring 37 along with the contraction.

JP 2004-263586 A

  The above-described invention of Patent Document 1 has the following drawbacks.

(1) The thermo-element 24 (temperature-sensitive movable part) or the wax 25a (thermal expansion / contraction member) that should sense the temperature of the high-temperature coolant A is provided on the temperature-sensitive part insertion support part formed in the housing 18 in a concave shape. The large area over the entire uppermost surface of the thermo element 24 (temperature-sensitive movable part) is in contact with the heater 24a, and the side surface of the thermo element 24 (temperature-sensitive movable part) is on the heater 24a side for the purpose of maintaining electrical insulation. The sealing member and the sealing surface are in contact with each other so that the high-temperature coolant A does not flow into, and only the lower part of the thermo element 24 (temperature-sensitive movable portion) is in contact with the high-temperature coolant A. For this reason, in the case of water temperature control only by the temperature sensitivity of the high-temperature coolant A, the temperature-sensing performance for accurately sensing the temperature of the high-temperature coolant A is insufficient, resulting in a lack of accuracy. It is. In addition, it takes time for the temperature of the high-temperature coolant A to be the same as the temperature of the temperature-sensing part, so that the response is insufficient, so that the water temperature control has a drawback that accuracy is lacking.

  Furthermore, the structure in which the thermo element 24 (temperature-sensitive movable part) controls the water temperature together with the heater 24a is expensive and has a drawback of increasing the risk of failure.

(2) Since the operation guide structure of the main shaft 28 that is movable depending on the temperature of the high-temperature coolant A is a one-point guide structure by the lower frame 33, the hydrodynamic pressure, the offset load by the return spring 37, the lateral load / torsion load, the pulse Lateral vibration stress due to flow, engine vibration, running vibration, etc. cannot be suppressed, and the thermoelement 24 (temperature-sensitive movable part) is adversely affected through the piston 26, shortening its life, and the main shaft 28 is shaken. When shaken, the main valve 29 is shaken integrally, so that there is a disadvantage that the mixing accuracy in the mixing section is adversely affected.

  The present invention has been made in view of the above-described drawbacks of the prior art, and an object thereof is to provide a thermostat device that makes temperature change of a high-temperature coolant more sensitive and enables more rapid, high-reaction and high-precision control. It is said.

  Another object of the present invention is to improve durability and cooling by reducing the effects of lateral vibration stress and shaking caused by hydrodynamic pressure, return load, unbalanced load, lateral load / torsion load, pulsating flow, engine vibration and running vibration. It aims at providing the thermostat apparatus which improved the temperature control precision of the liquid.

  Another object of the present invention is to make the temperature change of the high-temperature coolant heated by cooling the engine more sensitive, enabling more rapid, high-reaction, high-precision control, and water flow pressure. A thermostat device that improves durability and temperature control accuracy of coolant by reducing the effects of lateral vibration stress and shaking caused by uneven load, lateral load, torsional load, pulsating flow, engine vibration and running vibration due to return spring It is intended to provide.

  In order to achieve the above object, the present invention is configured as follows.

<Invention of Claim 1>
A temperature sensing part having a thermal expansion / contraction member that expands and contracts depending on the temperature of the coolant, and a temperature sensing movable part comprising a piston movable by the operation of the temperature sensing part, and has a valve that opens and closes by the movement of the piston. A thermostat that controls the temperature of the mixed coolant supplied to the engine by adjusting the mixing amount of the high-temperature coolant that has been cooled by the opening and closing operation of the valve to a high temperature and the low-temperature coolant that has been cooled by the radiator. in the device, between the temperature sensing unit all housed fixedly provided temperature sensing portion housing chamber in which the high-temperature-coolant flows, the temperature sensing portion which is housed a temperature-sensitive portion housing chamber, the temperature sensing part over the top to substantially the entire sides of it to form a cooling liquid temperature sensing section contact channel in which the high-temperature-coolant flow, the temperature sensing portion has a substantially hemispherical, which is curved from the side toward the top To be formed into a shape Constitute the thermostat device according to claim.
<Invention of Claim 2>
In the configuration of the invention according to claim 1, the inflow portion of the high-temperature coolant into the coolant-temperature-sensitive portion contact flow path is formed on the top side of the temperature-sensitive portion in the temperature-sensitive portion storage chamber. The thermostat apparatus characterized by this is comprised.

<Invention of Claim 3 >
In the configuration of the invention according to claim 1 or 2 , a temperature-sensitive cover is provided that is fixed to the housing and forms a temperature-sensitive part storage chamber, and for fixing the flange and the temperature-sensitive part integrally provided on the flange. A thermostat device provided with a fixing bracket having a fixing portion, wherein the flange is sandwiched and fixed between the temperature-sensitive portion cover and the housing, and the temperature-sensitive portion set in the fixing portion is fixed to the temperature-sensitive storage chamber. Is configured.

<Invention of Claim 4 >
In the configuration of the invention according to any one of claims 1 to 3 , the valve is fixed to a movable shaft, the movable shaft is moved by a movable operation of the piston, and the valve is opened and closed. A piston-side guide portion fixed to the housing that is longer than the maximum movable distance of the movable shaft defined by the maximum lift amount of the piston that guides the piston side of the movable shaft is provided, and the other side of the movable shaft is provided A thermostat device is provided in which the other side guide portion fixed to the housing side to be guided is provided.

  The “housing side” of the “other side guide portion fixed to the housing side” includes a configuration including an engine block to which a thermostat device is connected and a configuration not including the engine block. Therefore, the other side guide portion is fixed to the engine block. Both of the configuration and the configuration fixed to the housing are included in the technical category.

  “Fixed” of “the other side guide portion fixed to the housing side” is a configuration in which the other side guide portion, which is a member different from the housing, is attached and fixed, or a configuration formed integrally with the housing. Both are included in the technical category.

<Invention of Claim 5 >
According to the fourth aspect of the present invention, a thermostat device in which the piston and the movable shaft are in a non-connected structure.

  As is clear from the above description, the present invention has the following effects.

<Effect of the Invention of Claim 1>
A temperature sensing part having a thermal expansion / contraction member that expands and contracts depending on the temperature of the coolant, and a temperature sensing movable part comprising a piston movable by the operation of the temperature sensing part, and has a valve that opens and closes by the movement of the piston. A thermostat that controls the temperature of the mixed coolant supplied to the engine by adjusting the mixing amount of the high-temperature coolant that has been cooled by the opening and closing operation of the valve to a high temperature and the low-temperature coolant that has been cooled by the radiator. In the apparatus, a temperature sensing part accommodating chamber into which the temperature sensing part is accommodated and fixed and into which the high-temperature coolant flows is provided, and the temperature sensing part accommodating chamber and substantially the entire side part from the top of the temperature sensing part accommodated. Since the thermostat device is formed by forming the coolant temperature sensing portion contact flow path through which the high temperature coolant flows, the following effects are obtained.

  The high-temperature coolant is constantly flowing without disturbing the entire temperature-sensing part so that it flows while covering the entire surface, so that the temperature of the high-temperature coolant can be transmitted to the entire thermal expansion / contraction member sufficiently quickly and accurately. (High temperature sensitivity) is performed, and accurate piston lift control = valve control corresponding to the change in the high-temperature coolant temperature is performed. In other words, there is an effect of realizing a thermostat device in which the temperature control of the coolant is performed with agility and high accuracy.

  Further, since the structure is simple, there is an effect of realizing a thermostat device that is low in cost and has a low risk of failure.

<Effect of the Invention of Claim 3 >
In the configuration of the invention according to claim 1 or 2 , a temperature-sensitive cover is provided that is fixed to the housing and forms a temperature-sensitive part storage chamber, and for fixing the flange and the temperature-sensitive part integrally provided on the flange. A thermostat device provided with a fixing bracket having a fixing portion, wherein the flange is sandwiched and fixed between the temperature-sensitive portion cover and the housing, and the temperature-sensitive portion set in the fixing portion is fixed to the temperature-sensitive storage chamber. Because

In addition to the effects similar to those of the first or second aspect of the present invention, the flange is sandwiched and fixed between the temperature sensing unit cover and the housing, and a simple configuration with reduced water resistance in the temperature sensing chamber, and the entire circumference of the flange Simple, low cost, workability, and high-strength fixing can be achieved.

<Effect of the invention of claim 4, wherein>
In the configuration of the invention according to any one of claims 1 to 3 , the valve is fixed to a movable shaft, the movable shaft is moved by a movable operation of the piston, and the valve is opened and closed. A piston-side guide portion fixed to the housing that is longer than the maximum movable distance of the movable shaft defined by the maximum lift amount of the piston that guides the piston side of the movable shaft is provided, and the other side of the movable shaft is provided since it constitutes the thermostat formed by providing the other side guide portion fixed to the housing side apparatus for guiding exhibits the following described effects.

(1) Since the piston side and the other side of the movable shaft are slidably supported by the piston side guide portion and the other side guide portion fixed to the housing side, the structure has high strength.

(2) The two-point guide structure also supports the return shaft link (mainly the compression coil spring), the lateral load due to the water flow, the stress due to the pulsating flow, engine vibration, and running vibration at two points. Durability is improved.

(3) Since it is also a two-point guide structure, it realizes a stable and highly accurate movable operation of the movable shaft, and suppresses the shaking of the valve due to pulsating flow, engine vibration and running vibration, thus realizing highly accurate water temperature control. .

(4) “····· A temperature sensing portion storage chamber into which all the temperature sensing portions are housed and fixed and into which the high-temperature coolant flows is provided, and the temperature sensing portion housing chamber and the temperature sensing portion housed from the top to the side In the configuration of forming a coolant temperature sensing part contact flow path through which the high-temperature coolant formed between substantially the whole of the piston and the temperature sensing part is not affected by vibration or the like. By realizing the structure, it is possible to realize a stable flow of the high-temperature coolant in the coolant-temperature-sensitive portion contact flow path, and to achieve an effect that the temperature control of the coolant is highly accurate.

<Effect of the Invention of Claim 5 >
In the configuration of the invention according to any one of claims 1 to 3 , the valve is fixed to a movable shaft, the movable shaft is moved by a movable operation of the piston, and the valve is opened and closed. A piston-side guide portion fixed to the housing that is longer than the maximum movable distance of the movable shaft defined by the maximum lift amount of the piston that guides the piston side of the movable shaft is provided, and the other side of the movable shaft is provided Since the other side guide portion fixed to the housing side to be guided is provided and the piston and the movable shaft constitute a thermostat device having a non-connected structure,

In addition to the effect of the invention of any one of claims 1 to 3, the effect of the invention of claim 4 is achieved,

(1) Since the piston of the two-point guide structure and the temperature-sensitive movable part has a “non-coupled structure” (separate independent structure) with the movable shaft, the return sprinkle (compression coil spring) provided to the movable shaft Stress due to uneven load / torsion load, lateral load due to water flow, pulsating flow / engine vibration / running vibration is not transmitted to the piston, and the durability of the temperature-sensitive movable part is further improved. For the same reason, the stability of the operation of the piston of the temperature-sensitive movable part can be obtained.

(2) “···· A temperature sensing part storage chamber into which the high temperature cooling liquid flows is fixed by storing and fixing all the temperature sensing parts, and the temperature sensing part accommodation room and the top side of the temperature sensing part accommodated are side portions. In the configuration of forming the coolant temperature sensing part contact flow path through which the high temperature coolant formed between substantially the whole is formed, the piston and the temperature sensing part are not completely affected by vibration or the like. By realizing a structure that does not shake, it is possible to achieve a more complete and stable flow of the high-temperature coolant in the coolant-temperature-sensitive portion contact flow path, thereby achieving an effect that the temperature control of the coolant is highly accurate.

  The best mode for carrying out the present invention shown in the drawings will be described below. However, it is not intended to limit the present invention only to them.

  In the best first embodiment for carrying out the present invention shown in FIGS. 1 to 6, reference numeral 1 denotes a thermostat device, and the thermostat device 1 has the following configuration.

  The housing 2 includes a housing body 3, a temperature sensing part cover 4 fixed to the upper part of the housing body 3, and an engine block 5 from the engine 35 side for fixing the housing body 3. The housing body 3 and the engine block 5 are connected and tightened together by a bolt 6.

  A control mechanism 13 provided in the housing 2 seals a thermal expansion / contraction member (not shown) that expands and contracts depending on the temperature of the high-temperature coolant A1 that branches and bypasses the high-temperature coolant A that has become high temperature by cooling the engine. A temperature-sensing movable portion 16 comprising a temperature-sensing portion 14 and a piston 15 that is movable by being pushed out by the temperature-sensing portion 14, and a diameter of the piston 15 that is larger than that of the piston 15 that is movable by the movement of the piston 15. A movable shaft 17 in a non-coupled form (separate independent form) in which a contact portion is slidable, a valve 18 provided on the movable shaft 17 so as to move integrally with the movable shaft 17, and a piston 15 side of the movable shaft 17 are provided. Pis fixed to the housing body 3 having the piston side guide portion 22 longer than the 17 maximum movable distance defined by the 15 maximum lift amount to be guided. The other side fixing part 20 fixed to the housing main body 3 having the inner side supporting part 24 and the other side guiding part 19 for guiding the other side of the movable shaft 17, and provided between the other side fixing part 20 and the valve 18. And a compression coil spring 21 formed by pressing and urging 18.

  The housing body 3 has a radiator-side coolant channel chamber 7 in which the low-temperature coolant C cooled by the radiator 36 flows in and out, and a radiator-side coolant in which the low-temperature coolant C flows into the radiator-side coolant channel chamber 7. A radiator-side coolant flow that is opened and closed by a valve 18 that causes the low-temperature coolant C that has flowed into the radiator-side coolant channel chamber 7 to flow into the mixer 9 that forms the mixed coolant D that cools the engine 35. The temperature sensing part storage chamber 23 in which the inflow of the low temperature cooling liquid C formed by the outlet 10, the temperature sensing part cover 4 and the piston side support part 24 is completely blocked, and the high temperature cooling liquid A branch off to heat the inside of the vehicle. The heater core passage coolant B that has passed through the heater core 33 flowing into the mixing section 9 flows into the mixing section 9 and the high temperature coolant A1 that has flowed into the temperature sensing chamber 23 flows into the mixing section 9. The mixed part high-temperature coolant flow paths 26a and 26b formed through the opposing walls of the housing main body 3 to be inserted, and formed integrally with the three from the housing main body 3 so as to extend in opposition to the engine block 5. The other side fixed component support arms 27a and 27b that support the other side fixed component 20 on the front end side are provided.

  The piston 15 is made of a small-diameter member that is thinner than the movable shaft 17 and is in a non-connected form (separate independent form). By adopting such a configuration, even if the piston 15 is in the piston side guide portion 22, a configuration in which the piston 15 is separated from the inner wall of the piston 15 and is not influenced by the piston 15 is realized, and is in contact with the movable shaft 17. Is a non-coupled separation form, and is affected by lateral vibration stress and shaking caused by hydrodynamic pressure, return load, lateral load / torsion load, pulsating flow, engine vibration and running vibration applied to the movable shaft 17. Even if the piston-side guide portion 22 that does not transmit to the piston 15 and guides the movable shaft 17 is deformed by the influence of the 17, the piston 15 that is separated from the inner wall of the piston-side guide portion 22 has the effect. A form that is not received at all is realized. As a result, a highly accurate and reliable operation of the temperature sensing unit and high durability are realized.

  The temperature sensing part cover 4 is configured to cover substantially the entire side part from the top of the temperature sensing part 14, and is integrated with the housing body 3 to form a temperature sensing part storage chamber 23. A high temperature coolant contact channel 28 is formed between the temperature sensor storage chamber 23 and the temperature sensor 4 so that the high temperature coolant A1 flows from the top of the temperature sensor 4 over the whole. The high temperature coolant A1 that has passed flows into the mixing section 9 from the mixing section row high temperature coolant flow paths 26a, 26b. Above the side of the temperature sensing part cover 4, there is provided a temperature sensing part high temperature coolant inflow part 29 for allowing the high temperature coolant A 1 to flow into the high temperature coolant contact flow path 28.

  The temperature-sensitive movable part 16 is fixed to the temperature-sensitive part storage chamber 23 by fitting the temperature-sensitive part cover 4 and the flange 30 sandwiched between the housing body 3 and the temperature-sensitive part 14 provided integrally with the flange 30. This is done by a fixing metal fitting 32 composed of a ring-shaped fixing part 31.

  The valve 18 closes the radiator-side coolant outlet 10 since the high-temperature coolant A1 is at a low temperature, such as immediately after the engine 35 is started, and the inflow of the low-temperature coolant C from the radiator 36 to the mixing section 9 is stopped. Only the high-temperature coolant A1 and the heater core passing coolant B flow into the mixing unit 9 to form a mixed coolant D and are sent to the engine 35.

  As the temperature of the high-temperature coolant A1 rises, the thermal expansion / contraction member in the temperature sensing section 14 expands due to the increase in temperature, and the piston 15 is pushed out by the expansion of the thermal expansion / contraction member to be movable. The movable shaft 17 is pushed out and moved in unison with the pushed and extended movable body, and the movable movement of the movable shaft 17 moves the valve 18 against the biasing force of the compression coil spring 21 to move the radiator side coolant outlet 10. To increase the inflow of the low-temperature coolant C into the mixing section 9, and send the mixed coolant D of the high-temperature coolant A 1 + the heater core passing coolant B + the low-temperature coolant C to the engine 35.

  When the temperature of the high-temperature coolant A1 decreases, the thermal expansion / contraction member contracts, and the piston 15 is pushed back (contracted) via the valve 18 and the movable shaft 17 by the pressing force of the compression coil spring 21, and the piston is pushed back (contracted). The movable shaft 17 is moved back by movement (by the pressing force of the compression coil spring 21), and the valve 18 is closed.

  The valve 18 opens and closes according to the change in the high temperature coolant A1 to change the mixing ratio of the high temperature coolant A1 + the heater core passing coolant B + the low temperature coolant C to supply the mixed coolant D having the optimum temperature to the engine.

  Mixing part row high temperature coolant flow paths 26a and 26b, which are the flow paths for the high temperature coolant A, mixing section row heater core passage coolant flow paths 25, which are the flow paths for the heater core passage coolant B, and flow paths for the low temperature coolant C Since both the radiator side coolant channel chamber 7 and the radiator side coolant outlet 10 forming the same flow direction in the flowing water to the mixing unit 9 (the same structure in the flowing direction), The resistance can be made low. The ability to reduce the flow resistance increases the accuracy of the flow rate control, extends the life of the equipment by reducing uneven wear of parts, reduces the driving force and durability of the pump, and allows the use of a pump with a small driving force There are effects such as.

  The temperature sensing part high-temperature coolant inflow part 29 is not limited to the side part, and may be provided on the top side.

  The mixing portion is not limited to being formed inside the engine block 5 but may be formed by providing an engine inlet side housing separate from the engine and by forming a skirt portion extending the peripheral wall of the housing body 3. The form to do is also good.

  In addition, “having a temperature-sensitive movable portion including a temperature-sensitive portion having a thermal expansion / contraction member that expands and contracts depending on the temperature of the coolant and a piston that is movable by the operation of the temperature-sensitive portion, and is movable by the movable operation of the piston. It has a movable shaft, and has a valve that is fixed to the movable shaft and opens and closes by the movable operation of the piston, and the engine is cooled by the opening and closing operation of the valve and cooled by a high temperature coolant and a radiator. In the thermostat device in which the temperature of the mixed coolant supplied to the engine is adjusted by adjusting the mixing amount of the low-temperature coolant and the temperature-sensitive movable portion, the movable shaft, and the valve are provided in the housing, the temperature-sensitive portion A temperature-sensing part storage chamber into which the high-temperature coolant flows is provided by fixing all the parts, and the temperature-sensing part storage chamber and the temperature-sensitive part accommodated from the top to the substantially entire side part. The maximum temperature of the movable shaft defined by the maximum lift amount of the piston that forms the coolant temperature sensing portion contact flow path through which the high-temperature coolant formed immediately before flows and guides the piston side of the movable shaft. A thermostat device comprising a piston side guide portion fixed to the housing longer than a movable distance and an other side guide portion fixed to the housing side for guiding the other side of the movable shaft. Have novelty and inventive step.

  The present invention is used in the industry of manufacturing thermostat devices.

1 is a block diagram of a cooling system showing a best first embodiment for carrying out the present invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing a state in which a valve of a thermostat device according to a first embodiment for carrying out the present invention is closed. 1 is a cross-sectional view showing a state in which a valve of a thermostat device according to a first embodiment for carrying out the present invention is open. FIG. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view taken along line AA in a state in which a valve according to a first embodiment for carrying out the present invention is closed. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view taken along line AA in a state where a valve according to a first embodiment for carrying out the present invention is open. 1 is an exploded perspective view of a thermostat device according to a first preferred embodiment for carrying out the present invention.

Explanation of symbols

A: High temperature coolant A1: High temperature coolant B: Heater core passing coolant C: Low temperature coolant D: Mixed coolant 1: Thermostat device 2: Housing 3: Housing body 4: Temperature sensitive part cover 5: Engine block 6: Bolt 7: Radiator side coolant flow path chamber 8: Radiator side coolant inflow section 9: Mixing section 10: Radiator side coolant outlet 13: Control mechanism 14: Temperature sensing section 15: Piston 16: Temperature sensing movable section 17: Movable Shaft 18: Valve 19: Other side guide part 20: Other side fixed part 21: Compression coil spring 22: Piston side guide part 23: Temperature sensing part storage chamber 24: Piston side support part 25: Mixing part row heater core passing coolant flow Paths 26a, 26b: mixing section high temperature coolant flow paths 27a, 27b: other side fixed component support arm 28: high temperature coolant contact path 29: temperature sensing section high temperature coolant inflow section 30: flow Nji 31: fixing portion 32: fixing bracket 33: Hitakoa 35: engine 36: radiator 40: O-ring 41: Packing 42: Packing

Claims (5)

A temperature sensing part having a thermal expansion / contraction member that expands and contracts depending on the temperature of the coolant, and a temperature sensing movable part comprising a piston movable by the operation of the temperature sensing part, and has a valve that opens and closes by the movement of the piston. A thermostat that controls the temperature of the mixed coolant supplied to the engine by adjusting the mixing amount of the high-temperature coolant that has been cooled by the opening and closing operation of the valve to a high temperature and the low-temperature coolant that has been cooled by the radiator. In the device
A temperature-sensitive part storage chamber into which the high-temperature coolant flows is provided by fixing and storing all the temperature- sensitive parts, and the top of the temperature-sensitive part is located between the temperature- sensitive part storage chamber and the stored temperature- sensitive part. it forms a cooling liquid temperature sensing section contact passage the hot coolant flows over substantially the entire side from,
The thermostat device is formed in a substantially hemispherical shape that is curved from the side portion to the top portion . The inflow portion of the high temperature coolant into the coolant temperature sensing portion contact flow path is formed on the top side of the temperature sensing portion in the temperature sensing portion storage chamber. Thermostat device. A temperature-sensitive cover fixed to the housing to form a temperature-sensitive portion storage chamber; a flange and a fixing bracket having a fixing portion for fixing the temperature-sensitive portion provided integrally with the flange; The thermostat device according to claim 1 or 2, wherein a temperature sensing part sandwiched and fixed between the temperature sensing part cover and the housing and set in the fixing part is fixed to the temperature sensing storage chamber. . A valve is fixed to a movable shaft, and the movable shaft is moved by a movable movement of a piston so that the valve opens and closes. The maximum lift amount of the piston that guides the piston side of the movable shaft Provided is a piston-side guide fixed to the housing that is longer than the maximum movable distance of the movable shaft defined, and a second-side guide fixed to the housing for guiding the other side of the movable shaft. The thermostat device according to any one of claims 1 to 3, wherein The thermostat device according to claim 4, wherein the piston and the movable shaft have a non-connected structure.

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