JP5313653B2 - Thermostat device - Google Patents

Description

  The present invention relates to a thermostat device, and more particularly, a thermostat device that is provided on a circulation path that circulates cooling water in a portion to be cooled and efficiently supplies low-temperature cooling water around a case containing a thermal expansion body. About.

  In general, in an internal combustion engine as a cooled part mounted on a vehicle such as an automobile, a water-cooled cooling system using a radiator as a cooling part is used to cool the internal combustion engine. In this type of conventional cooling system, a thermostat device having a thermal expansion body that adjusts the amount of cooling water to be circulated to the radiator side is used so that the temperature of the cooling water introduced into the internal combustion engine can be controlled.

  This thermostat device is interposed between the cooling water inlet side and the outlet side of the internal combustion engine, and when the cooling water temperature is low, the valve body of the thermostat device is closed so that the cooling water does not pass through the radiator. When the cooling water temperature becomes high, the temperature of the cooling water supplied to the internal combustion engine becomes a predetermined temperature by opening the valve body of the thermostat device and circulating the cooling water through the radiator. So that it is controlled.

  By the way, in this thermostat device, the temperature of the cooling water is changed from the wax built in the thermo element by colliding the high temperature cooling water sent from the outlet side of the internal combustion engine through the bypass passage with the thermo element. Therefore, the valve body is opened and closed by expanding and contracting in response to this, and therefore it is necessary to promptly follow the temperature change of the cooling water with the opening and closing timing of the valve body.

  Conventional thermostat devices of this type include a high-temperature cooling water introduction passage that introduces cooling water heated by an internal combustion engine into the mixing passage, a low-temperature cooling water introduction passage that introduces cooling water cooled by the radiator into the mixing passage, The thermostat device is housed in a mixing passage of a housing having a cooling water delivery passage for delivering cooling water introduced into the mixing passage from the high temperature cooling water introduction passage and the low temperature cooling water introduction passage to the internal combustion engine. A case containing a thermal expansion body that expands and contracts due to a temperature change of the temperature, a holding section that is provided slidably with respect to the case in accordance with the volume change of the thermal expansion body, and whose protruding end portion is provided in the low-temperature cooling water introduction passage A thermo element having a piston rod held by the valve and a valve body provided on the outer periphery of the case, and a thermo element that surrounds the case A coil spring that biases the valve body so that the valve body closes the low-temperature cooling water passage, and is provided so as to surround the case between the thermoelement and the coil spring, and is supplied from the high-temperature cooling water introduction passage to the mixing passage The thing provided with the rectification | straightening member which rectifies | straightens the cooling water to be performed around the case is known (for example, refer patent document 1).

In this thermostat device, the cooling water supplied from the high-temperature cooling water introduction passage to the mixing passage can be rectified around the case by the rectifying member and can be made to collide with the thermo element positively, so it is built in the thermo element. The wax thus made can quickly follow the temperature change of the cooling water.
WO2007 / 108273 Publication

  However, in such a conventional thermostat device, since a dedicated rectifying member for rectifying the cooling water is required, the number of parts of the thermostat device increases and the rectifying member is installed in a limited space. The structure of the thermostat device has become complicated. For this reason, there existed a problem that the manufacturing cost increased while the weight of a thermostat apparatus increased.

  The present invention has been made in order to solve the above-described conventional problems, and an object thereof is to provide a thermostat device that has a simple structure and is lightweight and low in cost.

In order to achieve the above object, the thermostat device according to the present invention is (1) at least cooled by a high-temperature cooling water introduction passage for introducing cooling water heated by the cooled portion into the mixing passage, and the cooling portion. Low temperature cooling water introduction passage for introducing cooling water into the mixing passage, and cooling water delivery for sending cooling water introduced into the mixing passage from the high temperature cooling water introduction passage and the low temperature cooling water introduction passage to the cooled portion A thermostat device housed in the mixing passage of a housing having a passage ;
A case containing a thermal expansion body that expands and contracts due to a temperature change of the cooling water, a piston that is slidable with respect to the case in accordance with a volume change of the thermal expansion body, and whose protruding end is held by the holding portion A thermo element having a valve body provided on the outer periphery of the rod and the case;
An urging member that is provided so as to surround the case and urges the valve body directly or through the case so that the valve body closes the low-temperature cooling water passage ;
Said biasing member to a telescopic tubular spring in the axial direction constitutes a truncated conical volute spring, Ru is opposed openings in the axial direction larger diameter of the volute spring in the high-temperature cooling water introducing passage In addition, a case in which the thermal expansion body is built in or in the vicinity of the small-diameter-side opening portion of the bamboo shoot spring is located, and the cooling water introduced through the high-temperature cooling water introduction passage into the interior space of the bamboo shoot spring It is comprised from what was used as the guide passage .

  With this configuration, the urging member that urges the valve body in the valve closing direction is configured from a cylindrical spring that is extendable in the axial direction, and the space inside the cylindrical spring is opposed to the high-temperature cooling water introduction passage. The high-temperature cooling water introduced from the high-temperature cooling water introduction passage into the mixing passage can be rectified into the space inside the cylindrical spring and efficiently collide with the case of the thermo element. For this reason, the thermal expansion body incorporated in the case can promptly follow the temperature change of the cooling water.

And since it is a cylindrical spring that urges the valve body in the valve closing direction, and the truncated cone-shaped bamboo spring can also be used as a rectifying member, it is possible to prevent an increase in the number of parts of the thermostat device and The structure can be simplified. As a result, it is possible to reduce the weight of the thermostat device and to prevent an increase in manufacturing cost of the thermostat device.

In the thermostat device according to the above (1), (2) the cylindrical spring is composed of a bamboo spring.
With this configuration, the cylindrical spring is made up of bamboo child springs, so the high-temperature cooling water introduced from the high-temperature cooling water introduction passage into the mixing passage is rectified into the space inside the bamboo child springs and efficiently collides with the thermoelement case. Can be made.

  In addition, since the bamboo spring is a spirally wound plate-shaped member that overlaps part of the plate-shaped member, it is difficult for the coolant to leak from the gap between the overlapping portions of the plate-shaped member. The cooling water introduced into the passage can be easily rectified and collided with the case of the thermo element.

  In the thermostat device according to the above (1) or (2), (4) a pedestal having an opening for draining is provided at one end portion of the cylindrical spring facing the valve body, and the cylindrical spring is provided on the pedestal. One end is brought into contact with the base and the pedestal is attached to the valve body or the case.

  With this configuration, the cooling water introduced into the space inside the cylindrical spring from the high-temperature cooling water introduction passage through the mixing passage can be discharged from the opening for draining the pedestal. The flow of the cooling water introduced into the space can be smoothed, more cooling water can be introduced into the cylindrical spring, and the high-temperature cooling water can collide with the case of the thermo element more efficiently. .

  In the thermostat device according to the above (1) to (4), (5) a frame that houses the thermo element and the cylindrical spring, provided at one end of the frame, and the frame and the introduction of the low-temperature cooling water A valve seat that has an opening that communicates with the passage, and that contacts the valve body so as to close the opening; and a holding portion that is provided on the valve seat and holds the protruding end of the piston rod. And a seal member is interposed between the other end of the frame and the inner peripheral surface of the housing so as to surround the high-temperature cooling water introduction passage.

  With this configuration, since the sealing member is interposed between the other end of the frame and the inner peripheral surface of the housing so as to surround the high-temperature cooling water introduction passage, the high-temperature cooling water introduction passage is disposed in the space inside the cylindrical spring. You can communicate directly with. For this reason, all the high-temperature cooling water can be introduced into the space inside the cylindrical spring from the high-temperature cooling water introduction passage, and more cooling water is introduced into the cylindrical spring, The case of the thermo element can be made to collide more efficiently.

  The thermostat device of the present invention has a frame that houses the thermo element and the cylindrical spring, an opening that is provided at one end of the frame, and that communicates the frame with the low-temperature cooling water introduction passage. Since it has a valve seat with which the valve body abuts so as to be closed, and a holding portion that is provided on the valve seat and holds the protruding end of the piston rod, it reacts to high-temperature cooling water introduced from the high-temperature cooling water introduction passage When the thermal expansion body expands, the piston rod protrudes from the case.

  At this time, since the protruding end portion of the piston rod is held by the holding portion of the valve seat, the valve body opens against the urging force of the cylindrical spring by moving the case away from the valve seat. The cooling water led to the mixing passage from the high temperature cooling water introduction passage and the low temperature cooling water introduction passage can be mixed and sent to the cooling water lead passage.

  In the thermostat device according to the above (1) to (4), (6) a frame that houses the thermo element and the cylindrical spring, and is provided at one end of the frame, and the frame and the low-temperature cooling water introduction A valve seat that has an opening that communicates with the passage, and that contacts the valve body so as to close the opening; and a holding portion that is provided on the valve seat and holds the protruding end of the piston rod. A flange portion is formed on the outer peripheral portion of the other end portion of the frame, and the outer peripheral surface of the flange portion is in contact with the inner peripheral surface of the housing so as to surround the high temperature cooling water introduction passage. ing.

  With this configuration, a flange portion is formed on the outer peripheral portion of the other end portion of the frame, and the outer peripheral surface of the flange portion is brought into contact with the inner peripheral surface of the housing so as to surround the high temperature cooling water introduction passage. The passage can be directly communicated with the space inside the cylindrical spring. For this reason, all the high-temperature cooling water can be introduced into the space inside the cylindrical spring from the high-temperature cooling water introduction passage, and more cooling water is introduced into the cylindrical spring, The case of the thermo element can be made to collide more efficiently.

  In the thermostat device according to the above (1) to (4), (7) the valve body can be brought into contact with and separated from a valve seat of the housing formed in a communication portion between the low-temperature cooling water introduction passage and the mixing passage. A protruding end portion of the piston rod is held by a holding portion provided in the housing forming the low temperature cooling water introduction passage, and the other end portion of the cylindrical spring is surrounded by the high temperature cooling water introduction passage. Further, it is configured to be in contact with the inner peripheral surface of the housing.

  With this configuration, the other end of the cylindrical spring abuts on the inner peripheral surface of the housing so as to surround the high temperature cooling water introduction passage, so that the high temperature cooling water introduction passage can be directly communicated with the space inside the cylindrical spring. it can. For this reason, all the high-temperature cooling water can be introduced into the space inside the cylindrical spring from the high-temperature cooling water introduction passage, and more cooling water is introduced into the cylindrical spring, The case of the thermo element can be made to collide more efficiently.

  Further, the thermostat device of the present invention is a housing in which a valve body is provided in contact with and separated from a valve seat of the housing formed in a communicating portion between the low-temperature cooling water introduction passage and the mixing passage, and a low-temperature cooling water introduction passage is formed. The projecting end of the piston rod is held by the holding part provided on the inner surface of the housing, and the other end of the cylindrical spring is brought into contact with the inner peripheral surface of the housing so as to surround the high temperature cooling water introduction passage. When the thermal expansion body expands in response to the high-temperature cooling water introduced from the passage, the piston rod protrudes from the case.

  At this time, since the protruding end portion of the piston rod is held by the holding portion of the housing, the valve body is opened against the urging force of the cylindrical spring by moving the case away from the valve seat of the housing. Moving in the valve direction, the cooling water led out from the high-temperature cooling water introduction passage and the low-temperature cooling water introduction passage to the mixing passage is mixed and sent out to the cooling water lead-out passage.

  Therefore, the frame and the valve seat for housing the thermo element and the cylindrical spring are not required, the structure of the thermostat device can be further simplified, the thermostat device can be further reduced in weight, and the thermostat can be achieved. It is possible to further prevent the manufacturing cost of the apparatus from increasing.

  ADVANTAGE OF THE INVENTION According to this invention, the structure of a thermostat apparatus can be simplified, a thermostat apparatus can be reduced in weight, and it can prevent that the manufacturing cost of a thermostat apparatus increases.

Embodiments of a thermostat device according to the present invention will be described below with reference to the drawings.
(First embodiment)
FIGS. 1-7 is a figure which shows 1st Embodiment of the thermostat apparatus based on this invention.
First, the configuration will be described.
In FIG. 1, a cooling system 1 for an engine 2 that is an internal combustion engine as a part to be cooled includes a water pump 3 that circulates cooling water, an engine block passage 2a that circulates cooling water and cools the engine 2, and cooling water. A radiator flow path 5 in which a radiator 4 for cooling the refrigerant is disposed, a thermostat device 6 for controlling the circulation flow rate of the radiator flow path 5, a heater flow path 8 in which a heater core 7 through which cooling water is circulated is disposed, and a radiator flow The bypass channel 9 is branched from the path 5.

  The water pump 3 is a mechanical water pump that is driven by a crankshaft (not shown) of the engine 2, and the water pump 3 is provided upstream of the engine 2, that is, on the cooling water inlet side of the engine 2, By pumping into the engine 2, the engine 2 is cooled and cooling water is circulated through the cooling system 1.

  In addition, the heater core 7 is configured to function as a heat source of a heating device (not shown), and exchanges heat with high-temperature cooling water supplied to the heater flow path 8, so that the heater core 7 enters an air conditioning duct (not shown) of the vehicle. The sucked air is warmed.

  The thermostat device 6 is installed at the junction of the radiator flow channel 5, the heater flow channel 8 and the bypass flow channel 9, and the radiator flow channel 5, The ratio of the circulation flow rate of the radiator flow path 5, the heater flow path 8 and the bypass flow path 9 is controlled according to the mixed water temperature of the cooling water from the heater flow path 8 and the bypass flow path 9.

  2-6 is a figure which shows the structure of the thermostat apparatus 6. FIG. 2 is a cross-sectional view of the thermostat device 6, FIG. 3 is a side view of the thermostat device 6, FIG. 4 is a perspective view of the thermostat device 6, FIG. 5 is a top view of the thermostat device 6, and FIG. The bottom view of the thermostat device 6 is shown, respectively.

  In FIG. 2, the thermostat device 6 is accommodated in a housing 11, and the housing 11 is composed of a valve housing 12 and a housing body 13. A mixing passage 14 is formed in a space surrounded by the valve housing 12 and the housing body 13, and the thermostat device 6 is provided in the mixing passage 14.

  The housing body 13 is formed with a heater introduction passage 15, a bypass introduction passage (high temperature cooling water introduction passage) 16 and an engine delivery passage (cooling water delivery passage) 17. The valve housing 12 is provided with an introduction pipe 18, and radiator introduction passages 12 a and 18 a are formed in the valve housing 12 and the introduction pipe 18.

  The heater introduction passage 15 is connected to the heater flow path 8, and introduces cooling water sent from the engine 2 through the heater flow path 8 into the mixing passage 14. The bypass introduction passage 16 is connected to the bypass passage 9 and introduces high-temperature cooling water heated by the engine 2 into the mixing passage 14.

  The introduction pipe 18 is connected to the radiator flow path 5, and the radiator introduction path (low temperature cooling water introduction path) 12 a and the radiator introduction path 18 a (low temperature cooling water introduction path) are cooled by the radiator 4 as a cooling unit. Low-temperature cooling water delivered from the radiator flow path 5 is introduced into the mixing passage 14.

  The engine delivery passage 17 is configured to send the cooling water introduced into the mixing passage 14 from the heater introduction passage 15, the bypass introduction passage 16 and the radiator introduction passages 12 a and 18 a to the radiator passage 5. The cooling water delivered to the engine 2 is sucked up by the water pump 3 and supplied to the inlet side of the engine 2.

  As shown in FIGS. 3 and 4, the thermostat device 6 includes a substantially U-shaped frame 23 including a pair of support columns 21 a and 21 b and a bottom plate 22 provided integrally with the lower ends of the support columns 21 a and 21 b. 3 (FIG. 3 and FIG. 4 show only the column 21a), and an umbrella-shaped flange portion 25 as a valve seat is attached to the upper ends of the columns 21a and 21b. The flange portion 25 is fixed to the valve housing 12 and the housing body 13, and the thermostat device 6 is held by the valve housing 12 and the housing body 13.

  As shown in FIGS. 4 and 5, an opening 25 a is formed in the umbrella-shaped flange portion 25, and a bridge 25 b is formed so as to straddle the opening 25 a, and the opening 25 a 14 communicates with the radiator introduction passages 12a and 18a.

  A thermo element 24 is accommodated inside the frame 23 and the flange portion 25. The thermo element 24 includes a case 27 containing a wax 26 as a thermal expansion body that expands and contracts due to a temperature change of the cooling water. A piston rod 28 that slides relative to the case 27 as the volume of the wax 26 changes, and an umbrella-shaped valve body 30 that is provided on the outer periphery of the case 27 and has an annular elastic member 30a on the outer periphery. Yes.

  In this valve body 30, the elastic member 30a presses the peripheral edge of the opening 25a of the flange 25 (hereinafter, the flange portion at the periphery of the opening 25a is referred to as a valve seat), thereby closing the opening 25a and mixing. The communication between the passage 14 and the radiator introduction passages 12a and 18a is blocked.

  In addition, a cylindrical elastic spool 34 having an upper surface opened is interposed between the lower portion of the piston rod 28 and the wax 26. When the wax 26 expands, the elastic spool 34 is inwardly directed from below to above. The piston rod 28 is pushed upward by being elastically deformed so as to be crushed so that the peripheral surfaces are close to each other.

Moreover, the front-end | tip part of the piston rod 28 is hold | maintained at the holding | maintenance part 25c by fitting to the holding | maintenance part 25c formed in the center part of the bridge | bridging 25b.
Further, a rod 31 is attached to the bottom rear surface of the case 27, and the rod 31 is inserted through the bottom plate 22.

  As shown in FIG. 6, an opening 22 a is formed in the bottom plate 22, and the opening 22 a communicates the mixing passage 14 and the thermo element 24. The bottom plate 22 is provided with a trident bridge 22b protruding from the periphery of the opening 22a, and the rod 31 is slidably inserted into an insertion hole 22c formed at the tip of the bridge 22b. .

  An enlarged diameter portion 27a is formed above the case 27, and a spring receiving member 32 is attached to the outer peripheral portion of the case 27 below the enlarged diameter portion 27a. Between the spring receiving member 32 and the bottom plate 22, an urging member and a bamboo spring 33 as a cylindrical spring are interposed.

  As shown in FIGS. 7A and 7B, the bamboo spring 33 is formed by spirally winding a plate-like member so that a part of the plate-like member overlaps, and there is a gap in the overlapped portion of the plate-like member. By being formed, the structure can be expanded and contracted in the axial direction, and the cooling water introduced into the bamboo spring 33 is difficult to leak to the outside.

  The bamboo spring 33 is provided so as to surround the case 27 of the thermo element 24. By urging the spring receiving member 32, the spring receiving member 32 presses the enlarged diameter portion 27a of the case 27 upward. The elastic member 30a of the valve body 30 is brought into contact with the valve seat of the flange portion 25 through the case 27.

  The spring receiving member 32 constitutes a pedestal. The spring receiving member 32 includes a fitting hole 32a for fitting into the case 27, a spring receiving portion 32b with which the upper end of the bamboo shoot spring 33 abuts, and water drainage. An opening 32c is formed.

  A support member 29 is fitted to the inner peripheral portion of the enlarged diameter portion 27a of the case 27. The support member 29 slidably supports the piston rod 28 and the upper end of the elastic spool 34. The elastic spool 34 is held by the case 27 so that the elastic spool 34 does not come out of the case 27 by abutting against the portion. The support member 29 constitutes a part of the case 27.

Next, the operation will be described.
Immediately after the start of the engine 2 or the like, the cooling water is at a low temperature. Therefore, the valve body 30 is urged by the bamboo spring 33 so that the valve body 30 comes into contact with the valve seat and the mixing passage 14 and the radiator introduction passages 12a and 18a. Is disconnected.

  For this reason, high-temperature cooling water from the engine 2 is introduced from the bypass introduction passage 16 to the mixing passage 14 through the radiator passage 5 and the bypass passage 9. The cooling water introduced into the mixing passage 14 is rectified upward along the inner peripheral surface of the bamboo shoot spring 33 and collides with the periphery of the case 27 of the thermo element 24.

  The cooling water introduced into the space inside the bamboo shoot spring 33 is discharged from the opening 32 c of the spring receiving member 32 provided at the upper end of the bamboo shoot spring 33 and passes between the thermostat device 6 and the housing body 13. To the engine delivery passage 17. The cooling water sent to the engine delivery passage 17 is sent to the cooling water inlet side of the engine 2 by the water pump 3 through the radiator flow path 5.

  On the other hand, when the temperature of the cooling water rises as the engine 2 becomes hot and the temperature of the cooling water introduced into the mixing passage 14 from the bypass introduction passage 16 reaches a predetermined temperature, for example, 90 ° C., the case 27 The wax 26 exposed to the high-temperature cooling water reacts with the high-temperature cooling water to expand and increase its volume. At this time, the cooling water introduced into the mixing passage 14 from the bypass introduction passage 16 is rectified upward along the inner peripheral surface of the bamboo shoot spring 33 and collides with the periphery of the case 27 of the thermo element 24. The wax 26 thus made reacts quickly to the temperature change of the cooling water.

  At this time, since the wax 26 expands in response to the cooling water, the elastic spool 34 is elastically deformed so as to be crushed so that the inner peripheral surface approaches from the lower side to the upper side, so that the piston rod 28 moves upward. A force is exerted such that the piston rod 28 protrudes from the case 27.

  However, since the protruding end portion of the piston rod 28 is held by the holding portion 25c of the bridge 25b, the reaction force acts on the case 27 when the force that the wax 26 presses the piston rod 28 is applied. Then, the case 27 moves to the bypass introduction passage 16 side while pressing and shrinking the bamboo spring 33.

  Therefore, the valve body 30 attached to the case 27 is separated from the valve seat of the flange portion 25 to open the opening portion 25a, and the radiator introduction passages 12a and 18a and the mixing passage 14 are communicated with each other.

  Therefore, the low-temperature cooling water supplied from the radiator introduction passages 12a and 18a to the mixing passage 14 is mixed with the high-temperature cooling water supplied from the heater introduction passage 15 and the bypass introduction passage 16 to the mixing passage 14, and the engine delivery passage. Low-temperature cooling water is sent from 17, and is sent to the cooling water inlet side of the engine 2 by the water pump 3 through the radiator flow path 5.

  Further, when the temperature of the cooling water decreases, the wax 26 contracts, and the case 27 pushes back the piston rod 28 by the urging force of the bamboo spring 33. At this time, the elastic spool 34 is elastically deformed so that the inner peripheral surface is spaced apart from the upper side toward the lower side, so that the piston rod 28 tends to move downward.

  However, since the valve element 30 is urged upward by the bamboo spring 33 through the case 27, the valve element 30 comes into contact with the valve seat, and the communication between the mixing passage 14 and the radiator introduction passages 12a and 18a is blocked. The For this reason, high-temperature cooling water from the engine 2 is introduced from the bypass introduction passage 16 to the mixing passage 14 through the radiator passage 5 and the bypass passage 9.

  As described above, in the present embodiment, the case 27 containing the wax 26 that expands and contracts due to the temperature change of the cooling water, and slides with respect to the case 27 as the volume of the wax 26 changes, and the protruding end is held. A thermo-element 24 having a valve body 30 provided on the outer periphery of the piston rod 28 and the case 27 held by the portion 25c, and the case 27 of the thermo-element 24 so as to surround the case 27. And an urging member for urging the valve body 30 via the case 27 so as to close the 12a and 18a, and the urging member is extendable in the axial direction so as to urge the valve body 30 in the valve closing direction. Since the inner space of the bamboo shoot spring 33 is opposed to the bypass introduction passage 16, it is introduced from the bypass introduction passage 16 into the mixing passage 14. The cooling water is rectified to the space inside the volute spring 33, it can collide efficiently hot cooling water into the case 27 of the thermo-element 24. For this reason, the wax 26 incorporated in the case 27 can promptly follow the temperature change of the cooling water.

  In the present embodiment, the bamboo spring 33 that urges the valve body 30 in the valve closing direction can also be used as a rectifying member, so that the number of parts of the thermostat device 6 is prevented from increasing, and the thermostat device 6. The structure of the thermostat device 6 can be simplified, the weight of the thermostat device 6 can be reduced, and the manufacturing cost of the thermostat device 6 can be prevented from increasing.

  In particular, in the present embodiment, since the cylindrical spring is composed of the bamboo spring 33, the high-temperature cooling water introduced from the bypass introduction passage 16 to the mixing passage 14 is rectified into the space inside the bamboo spring 33, and the thermo element. It can be made to collide with 24 cases 27 efficiently.

  Further, since the bamboo spring 33 is wound so that a part of the plate member overlaps, it is difficult for the cooling water to leak from the gap of the overlapped part of the plate member, so that the bypass introduction passage 16 enters the mixing passage 14. The introduced cooling water can be easily rectified to collide with the case 27 of the thermo element 24.

  Further, in the present embodiment, a spring receiving member 32 having a water draining opening 32 c is provided at the upper end portion of the bamboo shoot spring 33 facing the valve body 30, and the upper end portion of the bamboo shoot spring 33 is brought into contact with the spring receiving member 32. In addition, since the spring receiving member 32 is attached to the case 27, the cooling water introduced from the bypass introduction passage 16 through the mixing passage 14 into the space inside the bamboo spring 33 is opened to drain the spring receiving member 32. 32c can be discharged.

  For this reason, the flow of the cooling water introduced into the space inside the bamboo shoot spring 33 can be made smooth, and a large amount of cooling water is introduced into the bamboo shoot spring 33 so that the high-temperature cooling water is supplied to the thermoelement 24. The case 27 can be made to collide more efficiently.

  In the present embodiment, the upper end portion of the bamboo shoot spring 33 is brought into contact with the spring receiving member 32 to urge the valve body 30 in the valve closing direction via the spring receiving member 32 and the case 27. Not limited to this, the valve element 30 may be directly urged by the bamboo element spring 33 by directly contacting the upper end of the bamboo element spring 33 with the valve element 30.

  Further, when the upper end of the bamboo spring 33 is brought into contact with the valve body 30, a spring receiving member 32 having a water draining opening 32 c may be interposed between the valve body 30 and the bamboo spring spring 33.

(Second Embodiment)
8 and 9 are diagrams showing a second embodiment of the thermostat device according to the present invention. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
In FIG. 8, an annular ring (seal member) 41 made of an elastic body such as rubber is interposed between the bottom plate 22 which is the other end of the frame 23 and the inner peripheral surface of the housing body 13. The ring 41 is provided so as to surround the bypass introduction passage 16.

As described above, in the present embodiment, since the annular ring 41 is interposed between the bottom plate 22 of the frame 23 and the inner peripheral surface of the housing body 13 so as to surround the bypass introduction passage 16, the bypass introduction passage 16 is made of bamboo shoots. It is possible to communicate directly with the space inside the spring 33. For this reason, all of the high-temperature cooling water can be introduced from the bypass introduction passage 16 into the space inside the bamboo sprung spring 33, and a large amount of cooling water is introduced inside the bamboo sprung spring 33, thereby The case 27 of the element 24 can be made to collide more efficiently.
Further, the cooling water introduced into the space inside the bamboo shoot spring 33 is discharged from the water draining opening 32 c of the spring receiving member 32 to the mixing passage 14 and sent to the engine delivery passage 17.

  Instead of the annular ring 41, a flange portion as shown in FIG. In FIG. 9, a flange portion 51 is provided on the outer peripheral portion of the bottom plate 22 of the frame 23, and the outer peripheral surface of the flange portion 51 abuts on the inner peripheral surface of the housing body 13 so as to surround the bypass introduction passage 16. ing.

  Thus, in the present embodiment, the flange portion 51 is formed on the outer peripheral portion of the bottom plate 22 of the frame 23, and the outer peripheral surface of the flange portion 51 abuts on the inner peripheral surface of the housing body 13 so as to surround the bypass introduction passage 16. Thus, the bypass introduction passage 16 can be directly communicated with the space inside the bamboo shoot spring 33.

  For this reason, all of the high-temperature cooling water can be introduced from the bypass introduction passage 16 into the space inside the bamboo sprung spring 33, and a large amount of cooling water is introduced inside the bamboo sprung spring 33, thereby The case 27 of the element 24 can be made to collide more efficiently.

(Third embodiment)
FIG. 10 is a diagram showing a third embodiment of a thermostat device according to the present invention. The thermostat device 60 of the present embodiment is configured by removing the frame 23 and the flange portion 25 from the thermostat device 6 shown in the first embodiment, and other configurations are the same as those of the first embodiment. Since it is the same as the form, the same number is attached | subjected to the structure same as 1st Embodiment, and description is abbreviate | omitted.

  In FIG. 10, a valve seat 62 is formed in the valve housing 12, and this valve seat 62 is formed in a communication portion between the radiator introduction passage 12 a and the mixing passage 14, and the valve body 30 is in contact with the valve seat 62. It comes to come and go. That is, when the valve body 30 comes into contact with the valve seat 62, the communication between the radiator introduction passages 12a and 18a and the mixing passage 14 is blocked, and when the valve body 30 is separated from the valve seat 62, the mixing is performed with the radiator introduction passages 12a and 18a. The passage 14 communicates with the passage 14.

  A holding portion 61 is formed in the valve housing 12 that forms the radiator introduction passage 12 a of the valve housing 12, and the protruding end portion of the piston rod 28 is held in the holding portion 61. Further, the lower end portion which is the other end portion of the bamboo shoot spring 33 is in contact with the inner peripheral surface of the housing body 13 so as to surround the bypass introduction passage 16.

  In the present embodiment, when high-temperature cooling water from the engine 2 is introduced into the mixing passage 14 from the bypass introduction passage 16 through the bypass passage 9 from the radiator passage 5, the cooling water Since the current is rectified upward along the peripheral surface and collides with the periphery of the case 27 of the thermoelement 24, the wax 26 incorporated in the case 27 reacts quickly to the temperature of the cooling water.

  Then, the cooling water introduced into the mixing passage 14 is discharged from the opening 32c of the spring receiving member 32 provided at the upper end of the bamboo shoot spring 33, and passes between the thermostat device 6 and the housing main body 13 to transmit the engine. 17 is sent out. The cooling water sent to the engine delivery passage 17 is sent to the cooling water inlet side of the engine 2 by the water pump 3 through the radiator flow path 5.

  The cooling water introduced into the mixing passage 14 from the heater passage 8 through the heater introduction passage 15 passes through the outer peripheral surface of the bamboo shoot spring 33 and is sent out to the engine delivery passage 17. The cooling water delivered to the engine delivery passage 17 is mixed with the cooling water introduced from the bypass introduction passage 16 into the mixing passage 14, passes through the radiator passage 5, and is supplied to the cooling water inlet side of the engine 2 by the water pump 3. Is sent out.

  Further, when the temperature of the cooling water introduced from the bypass introduction passage 16 into the mixing passage 14 reaches a predetermined temperature, for example, 90 ° C., the engine 2 becomes hot and is exposed to the high-temperature cooling water through the case 27. 26 expands and the volume increases.

  At this time, as the wax 26 expands, the piston rod 28 is pressed, and a force is applied so that the piston rod 28 protrudes from the case 27. However, since the protruding end portion of the piston rod 28 is held by the holding portion 61 of the valve housing 12, the reaction force acts on the case 27 when the force that the wax 26 presses the piston rod 28 is applied. Then, the case 27 moves to the bypass introduction passage 16 side.

  Therefore, the valve body 30 attached to the case 27 is separated from the valve seat of the flange portion 25 to open the opening portion 25a, and the radiator introduction passages 12a and 18a and the mixing passage 14 are communicated with each other. Therefore, the low-temperature cooling water supplied from the radiator introduction passages 12a and 18a to the mixing passage 14 is mixed with the high-temperature cooling water supplied from the heater introduction passage 15 and the bypass introduction passage 16 to the mixing passage 14, and the engine delivery passage. Low-temperature cooling water is sent from 17, and is sent to the cooling water inlet side of the engine 2 by the water pump 3 through the radiator flow path 5.

  In the present embodiment, since the lower end portion of the bamboo shoot spring 33 is brought into contact with the inner peripheral surface of the housing body 13 so as to surround the bypass introduction passage 16, the bypass introduction passage 16 is directly communicated with the space inside the bamboo shoot spring 33. can do. For this reason, all of the high-temperature cooling water can be introduced from the bypass introduction passage 16 into the space inside the bamboo sprung spring 33, and a large amount of cooling water is introduced inside the bamboo sprung spring 33, thereby The case 27 of the element 24 can be made to collide more efficiently.

  In the present embodiment, the protruding end portion of the piston rod 28 is held by the holding portion 61 of the valve housing 12, and the inner peripheral surface of the housing body 13 so that the other end portion of the bamboo shoot spring 33 surrounds the bypass introduction passage 16. Accordingly, the structure of the thermostat device 6 can be further simplified, and the structure of the thermostat device 6 can be further simplified. While being able to achieve weight reduction, it can prevent further that the manufacturing cost of the thermostat apparatus 6 increases.

( Reference example )
FIGS. 11-14 is a figure which shows the reference example of the thermostat apparatus which concerns on this invention, attaches | subjects the same number to the structure same as 1st Embodiment, and abbreviate | omits description.
In this reference example , as shown in FIG. 11, the spring receiving member 32 is eliminated, and the energizing member and the cylindrical spring are provided so as to surround the case 27 of the thermo element 24 between the valve body 30 and the bottom plate 22. The coil spring 71 has an upper end contacting the back surface of the valve body 30 and a lower end contacting the upper surface of the bottom plate 22.

  The coil spring 71 is formed with a close contact portion 71 a that is in close contact with the vertical portion so that the lower portion does not expand and contract in the vertical direction. The close contact portion 71 a surrounds the case 27. Further, the portion of the coil spring 71 above the contact portion 71a is vertically extendable and constitutes an expandable portion 71b. The close contact portion 71a is in close contact by welding, bonding or the like.

Next, the operation will be described.
In this reference example , when high-temperature cooling water from the engine 2 is introduced from the bypass passage 9 into the mixing passage 14 through the radiator passage 5, the cooling water is brought into contact with the coil spring 71. Since the current is rectified upward along the inner peripheral surface of 71a and collides with the periphery of the case 27 of the thermo element 24, the wax 26 incorporated in the case 27 reacts quickly to the temperature of the cooling water. In the present reference example , the close contact portion 71a is in close contact so as not to expand and contract in the vertical direction, so that cooling water does not leak from the close contact portion 71a.

  Then, the cooling water introduced into the mixing passage 14 is discharged from the gap between the expansion and contraction portions 71 b and is sent to the engine delivery passage 17 through the space between the thermostat device 6 and the housing body 13. The cooling water sent to the engine delivery passage 17 is sent to the cooling water inlet side of the engine 2 by the water pump 3 through the radiator flow path 5.

  Further, the cooling water introduced from the heater flow path 8 into the mixing path 14 via the heater introduction path 15 is sent to the engine delivery path 17 through the outer peripheral surface of the coil spring 71. The cooling water delivered to the engine delivery passage 17 is mixed with the cooling water introduced from the bypass introduction passage 16 into the mixing passage 14, passes through the radiator passage 5, and is supplied to the cooling water inlet side of the engine 2 by the water pump 3. Is sent out.

  Further, when the temperature of the cooling water introduced from the bypass introduction passage 16 into the mixing passage 14 reaches a predetermined temperature, for example, 90 ° C., the engine 2 becomes hot and is exposed to the high-temperature cooling water through the case 27. 26 expands and the volume increases.

  At this time, as the wax 26 expands, the piston rod 28 is pressed, and a force is applied so that the piston rod 28 protrudes from the case 27.

  However, since the protruding end portion of the piston rod 28 is held by the holding portion 25c of the bridge 25b, when the force that the wax 26 presses the piston rod 28 is applied, the reaction force is transmitted through the case 27. Acting on the valve body 30, the valve body 30 moves toward the bypass introduction passage 16 while pressing and contracting the expansion / contraction portion 71 b of the coil spring 71.

  Therefore, the valve body 30 attached to the case 27 is separated from the valve seat of the flange portion 25 to open the opening portion 25a, and the radiator introduction passages 12a and 18a and the mixing passage 14 are communicated with each other.

  Therefore, the low-temperature cooling water supplied from the radiator introduction passages 12a and 18a to the mixing passage 14 is mixed with the high-temperature cooling water supplied from the heater introduction passage 15 and the bypass introduction passage 16 to the mixing passage 14, and the engine delivery passage. Low-temperature cooling water is sent from 17, and is sent to the cooling water inlet side of the engine 2 by the water pump 3 through the radiator flow path 5.

  Further, when the temperature of the cooling water decreases, the wax 26 contracts, and the case 27 pushes back the piston rod 28 via the valve body 30 by the urging force of the expansion / contraction part 71 b of the coil spring 71. At this time, the elastic spool 34 is elastically deformed so that the inner peripheral surface is spaced apart from the upper side toward the lower side, so that the piston rod 28 tends to move downward.

  However, since the valve body 30 is urged upward by the expansion / contraction part 71b of the coil spring 71, the valve body 30 contacts the valve seat, and the communication between the mixing passage 14 and the radiator introduction passages 12a and 18a is blocked. . For this reason, high-temperature cooling water from the engine 2 is introduced from the bypass introduction passage 16 to the mixing passage 14 through the radiator passage 5 and the bypass passage 9.

As described above, even in the present reference example , the case 27 containing the wax 26 that expands and contracts due to the temperature change of the cooling water, and slides with respect to the case 27 as the volume of the wax 26 changes, and the protruding end portion Is provided so as to surround the case 27 of the thermoelement 24, and the thermoelement 24 having the piston rod 28 held by the holding portion 25c and the valve body 30 provided on the outer periphery of the case 27. An urging member for urging the valve body 30 via the case 27 so as to close the introduction passages 12a and 18a, and the urging member in the axial direction so as to urge the valve body 30 in the valve closing direction. The coil spring 71 has a telescopic part 71b that can be stretched and a close contact part 71a that does not stretch in the vertical direction, and bypasses the space inside the coil spring 71. Since it is opposed to the passage 16, the cooling water introduced from the bypass introduction passage 16 to the mixing passage 14 is rectified into the space inside the close contact portion 71 a of the coil spring 71, and the high temperature cooling water is supplied to the case 27 of the thermo element 24. Can be made to collide efficiently. For this reason, the wax 26 incorporated in the case 27 can promptly follow the temperature change of the cooling water.

Further, in this reference example , since the cooling water can be rectified by closely attaching a part of the coil spring 71 so as not to expand and contract, the manufacturing cost of the cylindrical spring can be made lower than that of the bamboo spring 33. it can.

In this reference example , as shown in FIG. 12, a coil spring 71 may be provided in the thermostat device 6 including the annular ring 41 of FIG. In this case, a coil spring 71 may be interposed between the valve body 30 and the bottom plate 22.

Moreover, as shown in FIG. 13, you may provide the coil spring 71 in the thermostat apparatus 6 provided with the flange part 51 of FIG. In this case, a coil spring 71 may be interposed between the valve body 30 and the bottom plate 22.
In this reference example , the coil spring 71 is interposed between the valve body 30 and the bottom plate 22, but the coil spring 71 is interposed between the valve body 30 and the housing body 13 as shown in FIG. 14. Then, the lower end of the contact portion 71a may be brought into close contact with the inner peripheral surface of the housing body 13.

  In each of the above embodiments, the bamboo spring 33 or the coil spring 71 is used as the cylindrical spring, but a mesh spring may be used. This mesh spring is, for example, a metal wire such as a piano wire or a stainless steel wire, which is then corrugated and formed into a cylindrical shape so that it can expand and contract in the axial direction. The cooling water introduced into the interior is difficult to leak outside.

Even when this mesh spring is used, the cooling water introduced from the bypass introduction passage 16 to the mixing passage 14 is rectified into the space inside the mesh spring, and the high-temperature cooling water is supplied to the case 27 of the thermo element 24. It can be made to collide efficiently, and the wax 26 built in the case 27 can promptly follow the temperature change of the cooling water.
Moreover, in this Embodiment, although applied to the cooling system 1 of the engine 2 as a to-be-cooled part, you may apply to the cooling system which cools to-be-cooled parts other than the engine 2. FIG.

  The embodiment disclosed this time is illustrative in all respects and is not limited to this embodiment. The scope of the present invention is shown not by the above description of the embodiments but by the scope of the claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of the claims.

  As described above, the thermostat device according to the present invention can simplify the structure of the thermostat device, reduce the weight of the thermostat device, and prevent the manufacturing cost of the thermostat device from increasing. And a thermostat device that is provided on a circulation path for circulating cooling water to the part to be cooled and efficiently supplies low-temperature cooling water around the case containing the thermal expansion body.

It is a figure which shows 1st Embodiment of the thermostat apparatus which concerns on this invention, and is a block diagram of a cooling system. It is a figure which shows 1st Embodiment of the thermostat apparatus which concerns on this invention, is sectional drawing of a thermostat apparatus, and is a sectional view of the AA direction arrow of FIG. 5 and a BB direction arrow sectional view of FIG. Equivalent to. It is a figure which shows 1st Embodiment of the thermostat apparatus which concerns on this invention, and is a side view of a thermostat apparatus. It is a figure which shows 1st Embodiment of the thermostat apparatus which concerns on this invention, and is a perspective view of a thermostat apparatus. It is a figure which shows 1st Embodiment of the thermostat apparatus which concerns on this invention, and is a top view of a thermostat apparatus. It is a figure which shows 1st Embodiment of the thermostat apparatus which concerns on this invention, and is a bottom view of a thermostat apparatus. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows 1st Embodiment of the thermostat apparatus which concerns on this invention, and is a figure which shows a bamboo child spring, (a) is a front view of a bamboo child spring, (b) is sectional drawing of a bamboo child spring. . It is a figure which shows 2nd Embodiment of the thermostat apparatus which concerns on this invention, and is sectional drawing of a thermostat apparatus. It is a figure which shows 2nd Embodiment of the thermostat apparatus which concerns on this invention, and is sectional drawing of the thermostat apparatus of another shape. It is a figure which shows 3rd Embodiment of the thermostat apparatus which concerns on this invention, and is sectional drawing of a thermostat apparatus. It is a figure which shows the reference example of the thermostat apparatus which concerns on this invention, and is sectional drawing of a thermostat apparatus. It is a figure which shows the reference example of the thermostat apparatus which concerns on this invention, and is sectional drawing of the thermostat apparatus which has another structure. It is a figure which shows the reference example of the thermostat apparatus which concerns on this invention, and is sectional drawing of the thermostat apparatus which has another structure. It is a figure which shows the reference example of the thermostat apparatus which concerns on this invention, and is sectional drawing of the thermostat apparatus which has another structure.

Explanation of symbols

2 Engine (cooled part)
4 Radiator (cooling part)
6, 60 Thermostat device 11 Housing 12a, 18a Radiator introduction passage (low-temperature cooling water introduction passage)
12b Valve seat 14 Mixing passage 16 Bypass introduction passage (high temperature cooling water introduction passage)
17 Engine delivery passage (cooling water delivery passage)
23 Frame 24 Thermo element 25 Flange (valve seat)
25a Opening 25c Holding part 26 Wax (thermal expansion body)
27 Case 28 Piston rod 30 Valve body 32 Spring receiving member (pedestal)
32c Opening 33 Bamboo spring (biasing member, cylindrical spring)
41 Annular ring (seal member)
51 Flange portion 61 Holding portion 62 Valve seat 71 Coil spring (biasing member, cylindrical spring)

Claims (5)

A high-temperature cooling water introduction passage for introducing cooling water heated by at least the cooled portion into the mixing passage, a low-temperature cooling water introduction passage for introducing cooling water cooled by the cooling portion into the mixing passage, and the high-temperature cooling water introduction In a thermostat device housed in the mixing passage of a housing comprising a passage and a cooling water delivery passage for delivering cooling water introduced into the mixing passage from the low-temperature cooling water introduction passage to the cooled portion,
A case containing a thermal expansion body that expands and contracts due to a temperature change of the cooling water, a piston that is slidable with respect to the case in accordance with a volume change of the thermal expansion body, and whose protruding end is held by the holding portion A thermo element having a valve body provided on the outer periphery of the rod and the case;
An urging member that is provided so as to surround the case and urges the valve body directly or through the case so that the valve body closes the low-temperature cooling water passage;
Said biasing member to a telescopic tubular spring in the axial direction constitutes a truncated conical volute spring, Ru is opposed openings in the axial direction larger diameter of the volute spring in the high-temperature cooling water introducing passage In addition, a case in which the thermal expansion body is built in or in the vicinity of the small-diameter-side opening portion of the bamboo shoot spring is located, and the cooling water introduced through the high-temperature cooling water introduction passage into the interior space of the bamboo shoot spring A thermostat device characterized by being a guide passage .   A pedestal having an opening for draining is provided at one end portion of the cylindrical spring facing the valve body, the one end portion of the cylindrical spring is brought into contact with the pedestal, and the pedestal is attached to the valve body or the case. The thermostat device according to claim 1, wherein the thermostat device is attached. A frame that houses the thermo element and the cylindrical spring, and an opening that is provided at one end of the frame and communicates with the frame and the low-temperature cooling water introduction passage so as to close the opening. A valve seat with which the valve body abuts, and a holding portion that is provided on the valve seat and holds the protruding end of the piston rod,
The thermostat according to claim 1 or 2 , wherein a seal member is interposed between the other end of the frame and the inner peripheral surface of the housing so as to surround the high-temperature cooling water introduction passage. apparatus. A frame that houses the thermo element and the cylindrical spring, and an opening that is provided at one end of the frame and communicates with the frame and the low-temperature cooling water introduction passage so as to close the opening. A valve seat with which the valve body abuts, and a holding portion that is provided on the valve seat and holds the protruding end of the piston rod,
A flange portion is formed on an outer peripheral portion of the other end portion of the frame, and an outer peripheral surface of the flange portion is brought into contact with an inner peripheral surface of the housing so as to surround the high temperature cooling water introduction passage. The thermostat apparatus of Claim 1 or Claim 2 . The valve body is provided in a valve seat of the housing formed in a communication portion between the low-temperature cooling water introduction passage and the mixing passage so as to be in contact with and separated from, and provided in the housing forming the low-temperature cooling water introduction passage. The protruding end portion of the piston rod is held by a holding portion, and the other end portion of the cylindrical spring is brought into contact with the inner peripheral surface of the housing so as to surround the high-temperature cooling water introduction passage. The thermostat apparatus of Claim 1 or Claim 2 .

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