The present invention is to provide a thermo-valve which can be operated with no unnecessary work to fill fluid easily and without fail into a circuit having the fluid flow therethrough at the time of a high temperature range. The thermo-valve comprises a valve housing 21, and a center guide shaft 2
The present invention is to provide a thermo-valve which can be operated with no unnecessary work to fill fluid easily and without fail into a circuit having the fluid flow therethrough at the time of a high temperature range. The thermo-valve comprises a valve housing 21, and a center guide shaft 27 movable to assume a valve movement limitation position GP1 in which a valve member 31 is retained to a second operation position BP2 to open a specific port, and a valve movement allowance position in which the valve member 31 is allowed to displace, the center guide shaft 27 and the valve housing 21 allowing a bimetal ring 51 to be disposed therebetween, and the bimetal ring being deformed to retain the center guide shaft 27 to the valve movement limitation position GP1 at the initial stage until the temperature of oil in the valve housing 21 firstly reaches the high temperature range, and to release the center guide shaft 27 from the valve movement limitation position GP1 when the temperature of the oil in the valve housing 21 reaches the high temperature range.
대표청구항▼
1. A thermo-valve, comprising: a valve housing formed with a plurality of ports respectively held in communication with the exterior passageways, and an valve actuation chamber held in communication with the ports;a valve member displaceable in the valve actuation chamber in response to the temperat
1. A thermo-valve, comprising: a valve housing formed with a plurality of ports respectively held in communication with the exterior passageways, and an valve actuation chamber held in communication with the ports;a valve member displaceable in the valve actuation chamber in response to the temperature of fluid in the valve actuation chamber to assume a first operation position to close a specific port selected from among the ports when the temperature of the fluid in the valve actuation chamber is maintained within a predetermined low temperature range, and a second operation position to open the specific port when the temperature of the fluid in the valve actuation chamber is maintained within a predetermined high temperature range, the valve member receiving an urging force toward the first operation position in the valve actuation chamber; anda valve position limitation member accommodated in the valve housing and movable to assume a valve movement limitation position in which the valve member is retained to the second operation position and a valve movement allowance position in which the valve member is allowed to displace in response to the temperature of the fluid, the valve position limitation member being urged toward the valve movement allowance position; characterized in that the thermo-valve further comprises:a temperature sensitive deformation member disposed between the valve position limitation member and the valve housing and deformable in response to the temperature,the temperature sensitive deformation member being deformed into a shape to retain the valve position limitation member to the valve movement limitation position at an initial stage until the temperature of the fluid in the valve housing initially reaches the high temperature range and to release the valve position limitation member from the valve movement limitation position when the temperature of the fluid in the valve housing initially reaches the high temperature range. 2. The thermo-valve as set forth in claim 1, in which the temperature sensitive deformation member is accommodated in the valve housing and deformable in response to the temperature within the valve housing. 3. The thermo-valve as set forth in claim 1, in which the temperature sensitive deformation member is provided outside of the valve housing and deformable in response to the temperature of at least one of the valve housing and the valve position limitation member. 4. The thermo-valve as set forth in claim 1, in which the valve position limitation member is constituted by a movable shaft axially movably supported on the valve housing. 5. The thermo-valve as set forth in claim 4, in which the temperature sensitive deformation member is radially deformed from its initial posture at which the temperature sensitive deformation member is engaged with the movable shaft to have the movable shaft retained to the valve movement limitation position when the temperature sensitive deformation member is deformed to have the movable shaft released from the valve movement limitation position. 6. The thermo-valve as set forth in claim 5, in which the temperature sensitive deformation member is constituted by a bimetal ring surrounding part of the movable shaft and expandable in diameter to be spaced apart from the part of the movable shaft when the temperature of the fluid reaches the high temperature range. 7. The thermo-valve as set forth in claim 4, in which the temperature sensitive deformation member has a fixing portion secured to the valve housing, and a deformation portion connected to the fixing portion and deformable to the shape having the movable shaft released from the valve movement limitation position. 8. The thermo-valve as set forth in claim 7, in which the deformation portion of the temperature sensitive deformation member is constituted by a bimetal ring extending in the radial direction of the movable shaft from the fixing portion. 9. The thermo-valve as set forth in claim 1, in which the plurality of ports comprises, other than the specific port, a first inlet port for introducing the fluid into the inside of the valve housing, a first outlet port for discharging the fluid from the inside of the valve housing, a second outlet port held in communication with the first inlet port, and a second inlet port for introducing the fluid discharged from the second outlet port, a first fluid passageway being formed in the valve housing to have the first inlet port and the first outlet port held in communication with each other when the valve member assumes the first operation position, anda second fluid passageway being formed in the valve housing to have the second inlet port and the first outlet port held in communication with each other through the specific port when the valve member assumes the second operation position. 10. The thermo-valve as set forth in claim 9, in which the plurality of ports includes a communication port constituting part of the first fluid passageway, and the valve member has a first valve body portion for opening and closing the communication port and a second valve body portion for opening and closing the specific port, the first valve body portion assuming the first operation position in which the communication port is opened to have the first inlet port and the first outlet port held in communication with each other through the first fluid passageway, and the second operation position in which the communication port is closed to have the first inlet port and the first outlet port held out of communication with each other through the first fluid passageway, andthe second valve body portion assuming the first operation position in which the specific port is closed to have the second inlet port and the first outlet port held out communication with each other, and the second operation position in which the specific port is opened to have the second inlet port and the first outlet port held in communication with each other. 11. The thermo-valve as set forth in claim 10, in which the valve member has a slidable cylindrical portion axially slidably engaged with the valve position limitation member, a drum portion integrally formed with the slidable cylindrical portion to form a volume variable chamber closed by the valve position limitation member, the first valve body portion axially displaceably supported on the drum portion, and the first valve body portion and the valve member allowing a first resilient member to intervene therebetween to impart to the first valve body an urging force in the direction having the communication port closed. 12. The thermo-valve as set forth in claim 10, in which the second valve body portion and the valve housing allows a second resilient member to intervene therebetween to impart to the second valve body an urging force in the direction having the specific port closed. 13. The thermo-valve as set forth in claim 1, in which the temperature sensitive deformation member is retained at a specific position of either one of the valve position limitation member and the valve housing when the temperature sensitive deformation member is deformed between the valve position limitation member and the valve housing to the shape having the valve position limitation member released from the valve movement limitation position in response to the temperature of the fluid first reaching the high temperature range.
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