WO2022176872A1 - サーモスタット装置 - Google Patents
サーモスタット装置 Download PDFInfo
- Publication number
- WO2022176872A1 WO2022176872A1 PCT/JP2022/006042 JP2022006042W WO2022176872A1 WO 2022176872 A1 WO2022176872 A1 WO 2022176872A1 JP 2022006042 W JP2022006042 W JP 2022006042W WO 2022176872 A1 WO2022176872 A1 WO 2022176872A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- inlet
- coolant
- housing
- thermo
- control valve
- Prior art date
Links
- 239000002826 coolant Substances 0.000 claims description 59
- 230000002093 peripheral effect Effects 0.000 claims description 20
- 230000004308 accommodation Effects 0.000 claims description 12
- 238000002485 combustion reaction Methods 0.000 claims description 5
- 239000000110 cooling liquid Substances 0.000 abstract description 31
- 230000004043 responsiveness Effects 0.000 abstract description 8
- 230000035945 sensitivity Effects 0.000 abstract description 8
- 238000001816 cooling Methods 0.000 abstract 1
- 239000007788 liquid Substances 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 239000000498 cooling water Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000003405 preventing effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P7/00—Controlling of coolant flow
- F01P7/14—Controlling of coolant flow the coolant being liquid
- F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/002—Actuating devices; Operating means; Releasing devices actuated by temperature variation
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/01—Control of temperature without auxiliary power
- G05D23/02—Control of temperature without auxiliary power with sensing element expanding and contracting in response to changes of temperature
- G05D23/021—Control of temperature without auxiliary power with sensing element expanding and contracting in response to changes of temperature the sensing element being a non-metallic solid, e.g. elastomer, paste
- G05D23/022—Control of temperature without auxiliary power with sensing element expanding and contracting in response to changes of temperature the sensing element being a non-metallic solid, e.g. elastomer, paste the sensing element being placed within a regulating fluid flow
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P7/00—Controlling of coolant flow
- F01P7/14—Controlling of coolant flow the coolant being liquid
- F01P2007/146—Controlling of coolant flow the coolant being liquid using valves
Definitions
- the present invention is arranged in a circulation flow path for circulating a coolant between an internal combustion engine (hereinafter also referred to as an engine) mounted on a vehicle, for example, and a radiator, and appropriately controls the temperature of the coolant. It relates to a thermostat device.
- an engine hereinafter also referred to as an engine mounted on a vehicle, for example, and a radiator
- the thermostat device has a thermoelement containing a thermal expansion body (wax) that expands and contracts in response to changes in the temperature of the cooling liquid flowing through the circulation passage between the engine and the radiator. ⁇ By opening and closing the control valve (valve element) due to the change in volume that accompanies contraction, it functions to maintain the cooling liquid at a predetermined temperature.
- a thermal expansion body wax
- thermo-actuating unit including a thermo-element containing a thermal expansion member and a control valve is accommodated in a housing and arranged, for example, on the inlet side of a cooling water passage of the engine.
- the control valve When the coolant temperature is low, the control valve is closed and the coolant is circulated through the bypass passage without passing through the radiator. Also, when the coolant temperature rises, the coolant is circulated through the radiator by opening the control valve. As a result, the temperature of the cooling liquid passing through the water jacket, which is the cooling water passage in the engine, is controlled to an appropriate state.
- this type of thermostat device has a first inlet for receiving cooling liquid from the radiator side, a second inlet for receiving cooling liquid via a bypass passage that does not pass through the radiator, the first inlet and the second inlet.
- a housing is provided having a coolant supply port for mixing the coolants from the engine and supplying the coolant to the water jacket side of the engine.
- the housing accommodates a thermo-actuating unit having a control valve for controlling the amount of cooling liquid introduced from the first inlet as the thermo-element moves in the axial direction (for example, Patent Document 1). .
- FIG. 10 schematically shows the flow of cooling liquid within the housing of a conventional thermostat device.
- the thermostat device 11 comprises a housing 12 composed of a case 13 and an inlet 14 and a thermo operating unit 15 accommodated therein.
- a first inlet 14a is formed on the side of the inlet 14 that constitutes the housing 12, and is an inlet for the cooling liquid from the radiator side.
- a second inflow port 13a is formed on the side of the case 13, which also constitutes the housing 12, as an inflow port for the cooling liquid from the bypass passage bypassing the radiator.
- the coolant from the inlets 13a and 14a is mixed in the housing 12 and sent out to the engine water jacket, water pump, etc. through the coolant outlet 13b.
- thermo operation unit 15 includes a thermo element (temperature sensing part) 15a containing a thermal expansion body (wax) that reacts to the temperature of the cooling liquid, a piston 15b that expands and contracts by the action of the thermal expansion body, and a thermo element 15a.
- a disk-shaped control valve (valve body) 15c is attached, and a spring member 15d is provided to bring the control valve 15c into contact with the inlet 14 side and bias it to the closed state.
- the tip of the piston 15b is mounted on a shaft support portion 14b formed in the inlet 14, and the open state of the control valve 15c is controlled according to the temperature of the coolant applied to the thermoelement 15a. be done. As a result, the inflow of coolant from the radiator side in particular is adjusted, and the temperature of the coolant applied to the engine is maintained at an appropriate level.
- thermostat device 11 cooled coolant from the radiator side flows into the housing 12 through the first inlet 14a, flows out of the housing 12 through the outlet 13b, and travels toward the engine ( Arrow C) in FIG.
- Some thermostat devices 11 block the inflow of cooling liquid from the second inlet 13a when the control valve 15c is opened by a large amount.
- High-temperature coolant from the bypass passage side flows into the housing 12 from the second inlet 13a, flows out of the housing 12 from the outlet 13b, and flows toward the engine.
- the opening amount of the control valve 15c is small, such as when the control valve 15c starts to open, and the cooled coolant from the radiator side flows into the thermoelement 15a, the temperature around the thermoelement 15a increases. is lowered, and the temperature sensitivity and responsiveness to the temperature of the high-temperature coolant from the bypass passage side are lowered. In addition, the temperature of the portion through which the cooled coolant passes is locally decreased, causing variations in the temperature around the thermo-element 15a, degrading the temperature sensitivity and responsiveness, and preventing the operation of the control valve 15c. It becomes stable or hunting occurs.
- An object of the present invention is to provide a thermostat device capable of suppressing the occurrence of heat.
- a thermostat device which has been made to solve the above-described problems, has a storage chamber formed inside, and a cooling liquid cooled by a radiator at one end is introduced into the storage chamber. and a second inlet having a second inlet formed at one end thereof for introducing the coolant heated in the internal combustion engine without passing through the radiator into the housing chamber.
- thermo-element that moves in the axial direction depending on the movement of the thermo-element, a control valve that controls the amount of coolant introduced from the first inlet as the thermo-element moves, and the thermo-element in the housing a valve seat formed at the tip of an annular protrusion protruding in the movement axis direction of the control valve and abutting against the control valve in the closed state; and a circumferentially continuous annular gap provided outside the valve seat and an annular groove having an open end formed along said valve seat.
- the valve seat against which the control valve abuts when the control valve is closed is formed at the tip of the annular protrusion.
- An annular groove is formed by a circumferentially continuous annular gap provided outside the valve seat, and an open end of the annular groove is formed along the valve seat.
- thermo-element on one side of the inner peripheral wall of the outlet-side duct in the direction in which the thermo-element moves, the thermo-element is provided so as to move toward the one side from the outflow port side as it approaches the storage chamber. It is desirable that an inclined slope is formed, and the end of the slope on the side of the accommodation chamber is located in a range from the position of the valve seat toward the one side and continues to the peripheral wall of the annular groove.
- a slope is formed on one side of the inner peripheral wall of the outlet-side pipe in the moving direction of the thermo-element so as to incline toward the one side as the accommodation chamber is approached from the outlet side.
- the end portion of the slope on the side of the accommodation chamber is located in a range from the position of the valve seat toward the one side, and is configured to continue to the peripheral wall of the annular groove.
- the housing includes a case and an inlet joined to the case, and the annular projection is configured to The inlet is provided so as to protrude inward, and the annular groove is formed between the outer peripheral surface of the annular protrusion and the inner peripheral surface of the case.
- the annular groove can be formed in the housing by joining the inlet to a case forming the housing. Therefore, when obtaining a housing made of resin, for example, it is not necessary to process a special mold for creating an annular groove in the housing, and it is possible to provide a product at reduced cost.
- FIG. 1 is a front view showing the overall construction of a first embodiment of a thermostat device according to the present invention.
- FIG. 2 is a partial cross-sectional view showing the front half of the housing in FIG. 1.
- FIG. 3 is a partial cross-sectional view of the left half of the housing, taken from the broken direction.
- FIG. 4 is a perspective view showing the overall configuration of the thermostat device.
- FIG. 5 is a perspective view showing a state in which the state shown in FIG. 4 is turned upside down.
- FIG. 6 is a partial cross-sectional view showing the flow of cooling liquid when the control valve is open.
- FIG. 7 is an enlarged sectional view of the annular groove and the slope portion.
- FIG. 1 is a front view showing the overall construction of a first embodiment of a thermostat device according to the present invention.
- FIG. 2 is a partial cross-sectional view showing the front half of the housing in FIG. 1.
- FIG. 3 is a partial cross-sectional view of the left half of the housing,
- FIG. 8 is a partial cross-sectional view showing a main part of a second embodiment of the thermostat device according to the invention.
- FIG. 9 is a partial cross-sectional view of a state rotated by 90 degrees with respect to FIG.
- FIG. 10 is a partial cross-sectional view showing an example of the flow of coolant in a conventional thermostat device.
- FIGS. 1 to 7 show the thermostat device 1 of the first embodiment, of which FIGS. 1 to 5 show the overall construction of the thermostat device 1 of the first embodiment.
- This thermostat device 1 is arranged in a circulation flow path for circulating coolant between an engine and a radiator, and a thermo operating unit 2 for controlling the temperature of the coolant supplied to the engine is housed in a housing 3. configured.
- the thermostat device 1 is arranged at the intersection of a cooling water passage from the radiator side and a bypass passage from the engine outlet side that does not pass through the radiator, and is provided with a coolant cooled by the radiator and a coolant heated by the engine. It mixes with the coolant passing through the bypass passage to properly control the temperature of the coolant reaching the engine inlet.
- the housing 3 forming the outer shell of the thermostat device 1 is composed of a case 4 both made of a resin material and an inlet 5 joined to the upper part of the case 4 and attached.
- the inlet 5 is provided with a first inlet-side conduit 3a having a cylindrical first inlet 5a for receiving coolant from the radiator side. It is formed in a state bent about 60 degrees (see FIGS. 1 and 2) with respect to the movement axis of the operation unit 2 . Further, the case 4 is formed with a unit accommodation space 4a serving as a accommodation chamber for accommodating the thermo-operation unit 2 in its central portion, and has a cylindrical second inlet 4b downward from the unit accommodation space 4a. A second inlet-side pipe line 3b is formed, and the coolant from the bypass passage is introduced into this second inlet 4b.
- case 4 is formed with an outlet-side pipe line 3c extending in a direction perpendicular to the movement axis of the thermo-operation unit 2 and having a coolant outlet 4c for supplying the coolant to the engine side. .
- the outlet side pipe 3c having the coolant outlet 4c is configured so as to be arranged upstream of a water pump that feeds the coolant to the engine. 1 and insertion holes 4e (see FIGS. 4 and 5) for fastening bolts are formed at positions opposed to the flange 4d by 180 degrees.
- An annular packing 4f is attached along the opening so as to surround the outflow port 4c of the cooling liquid and is joined to the water pump side.
- the thermo-operation unit 2 housed in the unit housing space 4a of the housing 3 has a cylindrical thermo-element (temperature-sensing part) 2a containing a thermal expansion body (wax) that expands and contracts depending on the temperature of the cooling liquid. is provided, and due to expansion and contraction of the thermal expansion body, the piston 2b arranged along the axis of the thermo-element 2a operates to extend and retract from the thermo-element 2a.
- the tip portion of the piston 2b is fitted in a shaft support portion 5b formed in an upper center portion of an inlet 5 that constitutes the housing 3, and is mounted inside the housing 3. As shown in FIG. Therefore, the cylindrical thermo-element 2a moves axially within the unit housing space 4a as the piston 2b expands and contracts.
- thermo-element 2a moves up and down.
- the moving direction of the thermo-element 2a is the vertical direction, and in the present embodiment, one side of the moving direction of the thermo-element in the scope of claims is the upper side.
- a disk-shaped control valve (valve element) 2c is attached to the upper portion of the thermo-element 2a, and the valve element formed on the outer peripheral edge of the control valve 2c is formed in the lower opening of the inlet 5. The valve is closed by coming into contact with the annular valve seat 5c.
- a spring member 2d is arranged so as to surround the thermo-element 2a so that one end thereof contacts the control valve 2c. It contacts the inner bottom portion 4g (see FIGS. 2 and 3) of the case 4 so as to surround the guide portion 4h.
- the spring member 2d provides a biasing force to press the disk-shaped control valve 2c against the annular valve seat 5c formed in the inlet 5.
- the lower portion of the thermo-element 2a is slidably supported by the guide portion 4h.
- a hole, groove, or notch (not shown) is formed in the guide portion 4h, and the coolant that has flowed into the housing 3 from the second inlet 4b passes through the hole, groove, or notch of the guide portion 4h. It can flow into the unit accommodation space 4a.
- the coolant supplied to the second inlet 4b from the bypass passage side is mainly supplied toward the thermoelement 2a. Therefore, when the temperature of the cooling liquid from the bypass passage side rises, the thermal expansion body built in the thermo-element 2a expands and the piston 2b extends (protrudes).
- thermo-element 2a As a result, the control valve 2c attached to the thermo-element 2a is opened by retracting toward the second inlet 4b against the biasing force of the spring member 2d. Coolant is introduced through the radiator. Therefore, the coolant from the first inlet 5a and the coolant from the second inlet 4b are mixed and sent from the coolant outlet 4c toward the water jacket, water pump, etc. of the engine. Thereby, the temperature of the coolant passing through the water jacket of the engine can be controlled to an appropriate state.
- valve seat 5c against which the control valve 2c abuts in the closed state protrudes in the housing 3 in the axial direction of movement of the thermo-element 2a, as shown in FIGS. It is formed at the tip of the molded annular protrusion 5d. A lower end opening (open end portion 3e) of the annular groove 3d is formed surrounding the valve seat 5c.
- the outlet-side pipe line 3c from the valve seat 5c in the housing to the cooling liquid outlet 4c is orthogonal to the movement axis direction of the thermo-element 2a.
- the housing chamber side end portion of the outlet side pipe line 3c faces the side portion of the thermo-element 2a.
- a slope 4i having an upward slope from the outflow port 4c side toward the annular groove 3d is formed on the upper portion of the inner peripheral wall of the outlet-side pipe line 3c.
- the aforementioned annular groove 3d and slope 4i are also shown in FIGS. 6 and 7, in which the control valve 2c is opened slightly away from the valve seat 5c.
- FIG. 7 shows an enlarged state of a part of the annular groove 3d and the slope 4i.
- the inlet 5 has a collar portion 5e having a larger outer diameter than other portions, and the collar portion 5e is joined to the upper opening edge of the case 4 by welding or the like.
- 4 and inlet 5 are integrated as housing 3 .
- the annular protrusion 5d is provided on the inlet 5 and protrudes into the case 4 from the inner peripheral end of the flange 5e.
- the outer diameter of the annular protrusion 5d is smaller than the upper inner diameter of the case 4 located on the outer periphery thereof, and an annular gap continuous in the circumferential direction is formed in the outer periphery of the annular protrusion 5d. 3d.
- the annular groove 3d is formed between the outer peripheral surface 5f of the annular protrusion 5d and the inner peripheral surface 4j of the case 4, and the opening end 3e of the annular groove 3d are arranged outside surrounding the valve seat 5c.
- a valve seat 5c is formed at the tip of the annular projection 5d, and the annular projection 5d and the flange 5e that constitute the inlet 5, the portion that extends from these to the first inlet side pipe line 3a, and the first inlet side. Since the thickness of the conduit 3a is substantially uniform, the dimensional accuracy can be improved when the inlet 5 is made of synthetic resin.
- a collar portion 5e projecting outward from the base end (the side opposite to the tip end) of the annular protrusion 5d is welded to the case 4. As shown in FIG. As described above, since the valve seat 5c is formed at the tip of the annular protrusion 5d, the valve seat 5c can be separated from the welded portion. As a result, the valve seat 5c is distorted due to the welding, and the cooling liquid can be prevented from leaking from between the control valve 2c and the valve seat 5c while the control valve 2c is in contact with the valve seat 5c.
- the accommodation chamber side end 4k of the slope 4i is located in a range from the position of the valve seat 5c to the one side (upper side in FIG. 7) in the movement direction of the thermo-element 2a.
- the end portion 4k continues to the peripheral wall of the annular groove 3d.
- a configuration is employed in which the end (upper end) 4k of the slope 4i on the side of the annular groove 3d is positioned above the lower end of the valve seat 5c.
- the cooling liquid from the radiator side introduced into the first inlet 5a is After being bounced off at the peripheral portion and flowing along the annular groove 3d as indicated by the arrow extending in the direction A in FIG. Therefore, the cooling liquid from the radiator side can be suppressed from flowing toward the thermo-element 2a side.
- the temperature sensitivity and responsiveness of the thermostat device 1 are improved, and the unstable operation of the control valve 2c and the occurrence of hunting can be suppressed.
- thermo-element 2a is less susceptible to the influence of the cooling liquid from the radiator side, which contributes to further improvement in temperature sensitivity and responsiveness, stable operation of the control valve 2c, and suppression of hunting. .
- the inlet 5 and the case 4 constituting the housing 3 are both made of a resin material as described above, and are preferably joined by welding.
- the means can be changed as appropriate.
- the inlet 5 and the case 4 can also be configured using a metal material or the like.
- FIGS. 8 and 9 show a thermostat device 1 of a second embodiment according to the invention. 8 and 9 showing the second embodiment, the parts having the same functions as those of the thermostat device 1 of the first embodiment shown in FIGS. , the detailed description thereof will be omitted as appropriate.
- the case 4 and the inlet 5 constituting the housing 3 are both made of a metal material, and are joined together via a packing 5g embedded in the inlet 5 in an annular shape.
- the other end of the spring member 2d that biases the control valve 2c toward the valve seat 5c is received by the spring receiving member 2e. are supported by a pair of opposing leg portions 5h (see FIG. 9) integrally formed with the inlet 5. As shown in FIG.
- a valve seat 5c is formed at the tip of an annular protrusion 5d formed to protrude in the movement axis direction of the thermo-element 2a.
- An annular groove 3d is formed surrounding the seat 5c.
- a cooling liquid so as to move toward one side in the movement direction of the thermo-element 2a as it approaches the storage chamber 4a from the outlet 4c side.
- An end 4k of the slope 4i on the accommodation chamber side is located in a range from the position of the valve seat 5c to the one side and continues to the peripheral wall of the annular groove 3d.
- the coolant flowing toward the outflow port 4c when the control valve 2c is opened flows into the annular groove 3d as indicated by the arrow extending in the direction B in FIG. Circulating along the inside, it flows out from the annular groove 3d through the slope 4i toward the outflow port 4c without resistance.
- the thermo-element 2a is less susceptible to the influence of the coolant from the radiator side, and as a result, the temperature sensitivity and responsiveness are improved, and hunting is prevented. It is possible to provide the thermostat device 1 that can also suppress the occurrence of
- the outlet-side pipe line 3c extending from the valve seat 5c in the housing 3 to the cooling liquid outlet 4c is the movement axis of the thermoelement 2a.
- a configuration formed in a direction orthogonal to the direction is adopted. However, this angle does not necessarily have to be orthogonal, and an appropriate angle can be selected to obtain similar effects.
- the thermostat device according to the present invention is useful as a device for supplying coolant to an automobile engine, and is particularly suitable for controlling the temperature of the coolant to be supplied to the engine to an appropriate state. .
- thermo operation unit 1 thermostat device 2 thermo operation unit 2a thermo element 2b piston 2c control valve (valve element) 2d spring member 2e spring receiving member 3 housing 3a first inlet pipe 3b second inlet pipe 3c outlet pipe 3d annular groove 3e opening end 4 case 4a unit storage space (accommodation chamber) 4b Second inlet 4c Outlet for coolant 4i Slope 4j Case inner peripheral surface 4k End of slope on housing chamber side 5 Inlet 5a First inlet 5c Valve seat 5d Annular protrusion 5f Annular protrusion outer peripheral surface 5h Leg
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Abstract
Description
また冷却液温度が高くなった場合は、制御バルブが開くことで冷却液はラジエータを通して循環される。これにより、エンジン内の冷却水路であるウォータジャケット内を通る冷却液の温度を適正な状態に制御するように動作する。
このサーモスタット装置11はケース13とインレット14により構成されたハウジング12内に、サーモ動作ユニット15が収容されて構成される。
前記ハウジング12を構成するインレット14側には、ラジエータ側からの冷却液の流入口である第1流入口14aが形成されている。同じくハウジング12を構成するケース13側には、前記したラジエータを迂回するバイパス通路からの冷却液の流入口である第2流入口13aが形成されている。
そして、前記した各流入口13a,14aからの冷却液は、ハウジング12内において混合されて、冷却液の流出口13bを介してエンジンのウォータジャケットやウォーターポンプ等へ向けて送り出される。
そして、サーモスタット装置11の中には、制御バルブ15cの開弁量が多くなると、第2流入口13aからの冷却液の流入を阻止するものもあるが、開弁開始時には、ラジエータを経由してないバイパス通路側からの高温の冷却液が、第2流入口13aからハウジング12内へ流入し、流出口13bからハウジング12外へと流出してエンジン側へと流れている。
これによると、制御バルブの開弁度合いが少ない状態においては、第1流入口に導入されるラジエータ側からの冷えた冷却液の大部分は、制御バルブの周縁部分で跳ね返されて、環状溝内に沿って周回するようにして流れ、冷却液の流出口に向かうように作用する。
したがって、ラジエータ側からの冷却液がサーモエレメント側に向かうのを抑制することができ、結果として、感温性及び応答性が向上し、制御バルブの動作が不安定になったり、ハンチングが生じたりするのを防止できる。
これによると、環状溝内に沿って周回するようにして流れるラジエータ側からの冷却液は、前記環状溝からスロープを介して前記流出口に向かって流出し易いものとなる。
したがって、サーモエレメントはラジエータ側からの冷却液の影響をさらに受け難いものとなり、感温性及び応答性のさらなる向上に寄与できるものとなる。
したがって、例えば樹脂製のハウジングを得ようとする場合において、ハウジング内に環状溝を作り出すための格別な成形型の加工は不要となり、コストを抑えた製品を提供することができる。
このサーモスタット装置1は、エンジンとラジエータとの間で、冷却液を循環させる循環流路内に配置されて、エンジンに供給する冷却液の温度を制御するサーモ動作ユニット2が、ハウジング3内に収容されて構成される。
この実施の形態においては、サーモスタット装置1の外郭を構成するハウジング3は、共に樹脂素材により成形されたケース4と、このケース4の上部に接合されて取り付けられたインレット5とにより構成される。
また、ケース4には、中央部にサーモ動作ユニット2を収容する収容室となるユニット収容空間4aが形成されると共に、そのユニット収容空間4aから下向きに、円筒状の第2流入口4bを有する第2入口側管路3bが形成されており、この第2流入口4bに、バイパス通路からの冷却液が導入される。
前記ピストン2bの先端部は、ハウジング3を構成するインレット5内の中央上部に形成されたシャフト支持部5bに嵌め込まれて、ハウジング3内に取り付けられている。
したがって、円筒状のサーモエレメント2aは、ピストン2bの伸縮に伴って、ユニット収容空間4a内を軸方向に移動するように動作する。すなわち、本実施の形態において、サーモエレメント2aは、上下に移動する。換言すると、サーモエレメント2aの移動方向は、上下方向であり、本実施の形態において、特許請求の範囲におけるサーモエレメントの移動方向の一方側は上側である。
そして、制御バルブ2cに一端部が接するように、ばね部材2dがサーモエレメント2aを囲むようにして配置されており、このばね部材2dの他端部は、ケース4の内底部4gから立ち上がるようにして形成されたガイド部4hを取り囲むようにして、ケース4の前記内底部4g(図2、図3参照)に当接している。
また、前記したガイド部4hによって、サーモエレメント2aの下部が摺動自在に支持される。このガイド部4hには、図示しない孔、溝又は切欠きが形成されており、第2流入口4bからハウジング3内に流入した冷却液がガイド部4hの上記孔、溝又は切欠きを通ってユニット収容空間4a内へ流入できる。
そこで、バイパス通路側からの冷却液の温度が上昇すると、サーモエレメント2aに内蔵された熱膨張体が膨張して、前記ピストン2bが伸張(突出)する。
したがって、第1流入口5aからの冷却液と、第2流入口4bからの冷却液は、混合されて、冷却液の流出口4cからエンジンのウォータジャケットやウォーターポンプ等へ向けて送り込まれる。これにより、エンジンのウォータジャケットを通る冷却液の温度を適正な状態に制御することができる。
前記した環状溝3dとスロープ4iについては、制御バルブ2cが弁座5cから僅かに離れて開弁状態にされた図6および図7にも示されている。
より具体的には、インレット5は、外径が他の部分と比較して大きい鍔部5eを有し、この鍔部5eがケース4の上端開口縁に溶着等により接合され、これにより、ケース4とインレット5がハウジング3として一体化される。また、環状突部5dは、インレット5に設けられ、鍔部5eの内周端からケース4内へ突出している。この環状突部5dの外径は、その外周に位置するケース4の上部内径よりも小さく、環状突部5dの外周に、周方向に連続する円環状の隙間が形成され、この隙間が環状溝3dとなっている。
従って、この実施の形態においては、前記環状溝3dは、環状突部5dの外周面5fと、前記ケース4の内周面4jとの間に形成されており、環状溝3dの開口端部3eは、前記弁座5cを囲んだ外側に配置されている。
また、環状突部5dの基端(先端の反対側)から外方へ突出する鍔部5eがケース4に溶着されている。前述のように、弁座5cは、環状突部5dの先端に形成されるので、弁座5cを溶着部から離間させることができる。これにより、溶着により弁座5cに歪みが生じ、制御バルブ2cが弁座5cに当接した状態で、これらの間から冷却液が漏れるのを防止できる。
換言すれば、スロープ4iの環状溝3d側の端部(上端)4kが、弁座5cの下端よりも上側に位置した構成が採用されている。
したがって、ラジエータ側からの冷却液が、サーモエレメント2a側に向かうのを抑制することができる。これにより、サーモスタット装置1の感温性及び応答性が向上し、制御バルブ2cの動作が不安定になったり、ハンチングが生じたりするのを抑制できる。
したがって、サーモエレメント2aはラジエータ側からの冷却液の影響をさらに受け難いものとなり、感温性及び応答性のさらなる向上、制御バルブ2cの動作の安定性、及びハンチングの抑制に寄与できるものとなる。
そして、この第2実施例のサーモスタット装置1は、制御バルブ2cを弁座5c側に向かって付勢するばね部材2dの他端部を、ばね受け部材2eにより受けており、このばね受け部材2eを、インレット5に一体に成形した対向する一対の脚部5h(図9参照)により支持した構成が採用されている。
さらに、環状溝3dから冷却液の流出口4cに向かう出口側管路3c内には、前記流出口4c側から前記収容室4aに近づくに従って前記したサーモエレメント2aの移動方向の一方側へ向かうように傾斜するスロープ4iが形成されており、スロープ4iの収容室側の端部4kは、弁座5c位置から前記一方側に向かった範囲に位置して、環状溝3dの周壁に連なっている。
これにより、前記した第1実施例のサーモスタット装置1と同様に、サーモエレメント2aは、ラジエータ側からの冷却液の影響を受け難いものとなり、結果として、感温性及び応答性が向上し、ハンチングの発生も抑えることができるサーモスタット装置1を提供することができる。
2 サーモ動作ユニット
2a サーモエレメント
2b ピストン
2c 制御バルブ(弁体)
2d ばね部材
2e ばね受け部材
3 ハウジング
3a 第1入口側管路
3b 第2入口側管路
3c 出口側管路
3d 環状溝
3e 開口端部
4 ケース
4a ユニット収容空間(収容室)
4b 第2流入口
4c 冷却液の流出口
4i スロープ
4j ケース内周面
4k スロープの収容室側端部
5 インレット
5a 第1流入口
5c 弁座
5d 環状突部
5f 環状突部外周面
5h 脚部
Claims (3)
- 内側に収容室が形成されて、一端にラジエータによって冷却された冷却液を前記収容室に導入する第1流入口が形成される第1入口側管路と、一端に前記ラジエータを介さない内燃機関において加熱された冷却液を前記収容室に導入する第2流入口が形成される第2入口側管路と、一端に前記収容室の冷却液を前記内燃機関に供給する冷却液の流出口が形成される出口側管路とを有するハウジングと、
前記収容室に収容され、冷却液の温度に依存して、軸方向に移動するサーモエレメントと、
前記サーモエレメントの移動に伴って、前記第1流入口からの冷却液の導入量を制御する制御バルブと、
前記ハウジング内において、前記サーモエレメントの移動軸方向に突出成形された環状突部の先端部に形成され、前記制御バルブが閉弁状態で当接する弁座と、
前記弁座の外側に施された周方向に連続する環状の隙間によって構成され、開口端部が前記弁座に沿って形成された環状溝と、
を備えた、
ことを特徴とするサーモスタット装置。 - 前記出口側管路の内周壁における前記サーモエレメントの移動方向の一方側には、前記流出口側から前記収容室に近づくに従って前記一方側へ向かうように傾斜するスロープが形成され、
前記スロープの収容室側端部は、前記弁座の位置から前記一方側に向かった範囲に位置して、前記環状溝の周壁に連なる、
ことを特徴とする請求項1に記載のサーモスタット装置。 - 前記ハウジングは、ケースと、ケースに接合されるインレットとを有して構成され、前記環状突部が前記ケース内に突出するように前記インレットに設けられ、前記環状溝が前記環状突部の外周面と、前記ケースの内周面との間に形成される、
ことを特徴とする請求項1または2に記載のサーモスタット装置。
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AU2022222065A AU2022222065A1 (en) | 2021-02-17 | 2022-02-16 | Thermostat device |
CN202280015073.0A CN116940748A (zh) | 2021-02-17 | 2022-02-16 | 恒温装置 |
US18/276,141 US12025049B2 (en) | 2021-02-17 | 2022-02-16 | Thermostat device |
EP22756190.9A EP4296485A1 (en) | 2021-02-17 | 2022-02-16 | Thermostat device |
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