IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0695653
(2003-10-29)
|
우선권정보 |
JP-2002-316656(2002-10-30) |
발명자
/ 주소 |
- Yamaguchi,Kunihiro
- Tamura,Koichi
- Araki,Akinori
- Nagai,Yasushi
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
4 인용 특허 :
6 |
초록
▼
A pressure regulating valve which is comprised of a valve body being comprised of a cylinder, a spool slidably disposed in the cylinder with a clearance, the spool and the cylinder defining a pressure chamber and a space portion, and an urging member which urges the spool in a direction opposite to
A pressure regulating valve which is comprised of a valve body being comprised of a cylinder, a spool slidably disposed in the cylinder with a clearance, the spool and the cylinder defining a pressure chamber and a space portion, and an urging member which urges the spool in a direction opposite to a direction of a force applied to the spool by fluid pressure in the pressure chamber. A supply passage fluidly communicates the cylinder and a fluid pressure supply source, and a drain passage fluidly communicates the cylinder and a sump. A through-passage formed in the spool fluidly communicates the pressure chamber and the space portion. An orifice disposed between the space portion and a sump limits a flow rate of fluid drained from the space portion to the sump. The spool is made of material having a lower thermal expansion coefficient than material of the valve body.
대표청구항
▼
What is claimed is: 1. A pressure regulating valve for regulating a pressure of fluid to be outputted from the pressure regulating valve, the pressure regulating valve comprising: a valve body having a cylinder, a supply passage which fluidly communicates the cylinder and a fluid pressure supply so
What is claimed is: 1. A pressure regulating valve for regulating a pressure of fluid to be outputted from the pressure regulating valve, the pressure regulating valve comprising: a valve body having a cylinder, a supply passage which fluidly communicates the cylinder and a fluid pressure supply source, and a drain passage which fluidly communicates the cylinder and a sump; a spool slidably disposed in the cylinder with a clearance, the spool being made of a material having a lower thermal expansion coefficient than that of a material of the valve body, the spool and the cylinder defining a pressure chamber and a space portion; an urging member disposed in the space portion to urge the spool in a direction opposite to a direction of a force applied to the spool by fluid pressure in the pressure chamber; a through-passage formed in the spool so as to fluidly communicate the pressure chamber and the space portion; and an orifice disposed between the space portion and a sump to limit a flow rate of fluid drained from the space portion to the sump. 2. The pressure regulating valve as claimed in claim 1, wherein a flow rate of fluid, which flows from the pressure chamber to the space portion through the clearance and the through-passage, increases according to the increase of a temperature of the fluid. 3. The pressure regulating valve as claimed in claim 2, wherein the clearance is increased according to the increase of the fluid temperature. 4. The pressure regulating valve as claimed in claim 1, wherein a port of the supply passage to the pressure chamber is always fully open, and the spool intermittently closes a port of the drain passage to the pressure chamber. 5. The pressure regulating valve as claimed in claim 1, wherein a flow rate of fluid flowing from the pressure chamber to the space portion is less than a flow rate of the orifice when under a low temperature condition, a flow rate of fluid flowing from the pressure chamber to the space portion is more than a flow rate of the orifice when under a high temperature condition. 6. The pressure regulating valve as claimed in claim 1, wherein an amount of fluid flowing from the clearance and the through-passage into the space portion is less than an amount of fluid flowing through the orifice when fluid temperature is low, an amount of fluid flowing from the clearance and the through-passage into the space portion is more than an amount of fluid flowing through the orifice when fluid temperature is high. 7. The pressure regulating valve as claimed in claim 1, wherein the spool comprises a plurality of lands, the through-passage being formed in a land of the spool. 8. The pressure regulating valve as claimed in claim 3, wherein the spool and the orifice are made of steel, and the valve body is made of aluminum. 9. The pressure regulating valve as claimed in claim 1, wherein the clearance is formed between an inner circumference of the cylinder and an outer circumference of the spool. 10. The pressure regulating valve as claimed in claim 7, wherein the clearance is formed between the inner circumference of the cylinder and an outer circumference of the land in which the through-passage is formed. 11. The pressure regulating valve as claimed in claim 1, wherein fluid pressure from the supply passage is fed back to urge the spool in one direction via a branch passage, the branch passage comprising an orifice. 12. The pressure regulating valve as claimed in claim 1, wherein a flow rate FT of the through-passage, a flow rate F C of the clearance, and a flow rate FO of the orifice exist in a relationship under a lower temperature condition where the expression FO>FT+FC is satisfied, and exist in a relationship under a higher temperature condition where the expression FO<FT+FC is satisfied. 13. The pressure regulating valve as claimed in claim 1, wherein the spool is forced to slide and unblock the drain passage when fluid pressure of the pressure chamber has risen above a preset target value, thereby maintaining fluid pressure of the pressure chamber at the target value. 14. A pressure regulating valve comprising: a valve body; a bore formed in the valve body, the bore comprising a space portion, a first pressure chamber, and a second pressure chamber; a spool which is slidably inserted within the bore, a diameter of an inner circumference of the bore being greater than a diameter of an outer circumference of the spool so as to form a clearance, the first pressure chamber thereby being in hydraulic communication with the space portion, a material of the spool having a lower thermal expansion coefficient than a material of the valve body; a supply passage through which hydraulic pressure is supplied to the first pressure chamber from a pressure supply source; a drain passage through which hydraulic pressure is drainable from the first pressure chamber; a through-passage being formed in the spool through which the space portion and the first pressure chamber are in hydraulic communication; and an urging member which is disposed in the space portion to apply an urging force to the spool; wherein hydraulic pressure in the second pressure chamber pushes the spool to allow draining of hydraulic pressure when hydraulic pressure in the first pressure chamber has risen above a target hydraulic pressure, the draining continuing until an equilibrium is reached between the urging force of the urging member and an opposing urging force of hydraulic pressure in the second pressure chamber. 15. The pressure regulating valve as claimed in claim 14, wherein the spool comprises a plurality of large diameter portions, the through-passage being formed in a large diameter portion which is disposed between the space portion and the first pressure chamber. 16. A pressure regulator valve of an automatic transmission, the pressure regulator valve comprising: a valve body which comprises a cylinder, a supply passage which hydraulically connects the cylinder and a pressure supply source, a drain passage which hydraulically connects the cylinder and a sump, and an inflow-outflow passage which hydraulically connects the cylinder and the sump; a spool which is slidably inserted within the cylinder, the spool dividing the cylinder into at least one space portion hydraulically connected to the inflow-outflow passage, a first pressure chamber receiving pressure from the supply passage, and a second pressure chamber receiving pressure from the supply passage, a material of the spool having a lower thermal expansion coefficient than a material of the valve body; urging means for applying an urging force on the spool in a direction opposed to an urging force of the second pressure chamber, the spool sliding to allow excess pressure to drain when hydraulic pressure of the second pressure chamber overcomes the urging force of the urging means; a clearance through which fluid flows from the first pressure chamber into the space portion; a through-passage through which fluid flows from the first pressure chamber into the space portion, the through-passage being formed in the spool; and restricting means for restricting the flow rate of the inflow-outflow passage, the flow rate of the restricting means being less than a combined flow rate of the through-passage and the clearance under a low temperature condition, the flow rate of the restricting means being more than a combined flow rate of the through-passage and the clearance under a high temperature condition.
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