IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0608429
(2009-10-29)
|
등록번호 |
US-8651827
(2014-02-18)
|
우선권정보 |
JP-2008-279038 (2008-10-30) |
발명자
/ 주소 |
- Usui, Satoshi
- Miyazaki, Katsumi
- Yamada, Hiroyuki
- Tamura, Shingo
|
출원인 / 주소 |
- Hitachi Automotive Systems, Ltd.
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
0 인용 특허 :
5 |
초록
A lead line weld joined portion is disposed externally of a magnetic circuit, i.e., of a yoke portion. This allows generation of a sufficient magnetic biasing force between a first core portion and the anchor.
대표청구항
▼
1. An electromagnetically-driven valve mechanism comprising: a valve member disposed at a fluid inlet port;a movable plunger operated by an electromagnetic force;a spring member biasing the movable plunger in a direction opposite the electromagnetic force; andan electromagnetic drive mechanism for o
1. An electromagnetically-driven valve mechanism comprising: a valve member disposed at a fluid inlet port;a movable plunger operated by an electromagnetic force;a spring member biasing the movable plunger in a direction opposite the electromagnetic force; andan electromagnetic drive mechanism for operating the valve member through the movable plunger against the spring member by electromagnetically biasing the movable plunger to open and close the fluid inlet port;the electromagnetic drive mechanism including a core portion adapted to receive the movable plunger inserted therethrough,an annular or cylindrical electromagnetic coil portion attached around the core portion,a cylindrical yoke portion surrounding the outside of the electromagnetic coil portion,a resin-molded body composed of the electromagnetic coil portion and the yoke portion,a connector portion formed integrally with the resin-molded body so as to be used for connection with external equipment, andan external connection terminal made of a conductor and mounted to the connector portion;wherein a welded portion that connects an end of a lead line forming the electromagnetic coil portion and one end of the external connection terminal is disposed externally of the yoke portion;the core portion is mounted in a cylindrical space defined by an inner circumferential surface of the resin-molded body;the resin-molded body is fixedly press-fitted into an outer circumference of the core portion at an open end of the yoke portion; andan inner diameter of a section of the inner circumferential surface of the resin-molded body that contacts the core portion at a bottom wall of the yoke portion is a smallest inner diameter of the inner circumferential surface of the resin-molded body. 2. The electromagnetically-driven valve mechanism according to claim 1, wherein the electromagnetic drive mechanism is attached with the core portion in a bottomed cylindrical space defined between an inner circumferential surface of the electromagnetic coil portion and part of an inner circumferential surface of the resin-molded body. 3. The electromagnetically-driven valve mechanism according to claim 2, wherein a minute gap is defined between an outer circumferential surface of the core portion and then inner circumferential surface of the resin-molded body. 4. The electromagnetically-driven valve mechanism according to claim 1, wherein the electromagnetic coil portion includesan annular or cylindrical resin bobbin andthe lead line wound around the bobbin,wherein the one end of the external connection terminal is mechanically attached to an axial end of the bobbin. 5. The electromagnetically-driven valve mechanism according to claim 1, wherein the core portion is composed of a first core portion made of a magnetic material and a second core portion made of a magnetic material,the second core portion is formed like a cap and formed with an annular groove on an outer circumference of the second core portion at a specific axial position,an open end of the second core portion is full-circumferentially welded to one end of the first core portion,an anchor is secured to an end of the movable plunger,a magnetic gap is defined between respective axial opposite surfaces of the anchor and the first core, andthe annular groove is formed around the magnetic gap. 6. The electromagnetically-driven valve mechanism according to claim 5, wherein the first core portion is provided with a restricting portion adapted to restrict an axial displacement of the anchor at a specific position,the spring member is attached between the anchor and the first core portion so as to bias the anchor toward a side opposite the restricting member,during energization, the electromagnetic drive mechanism attracts the anchor toward the first core in a direction opposite the biasing force of the spring member,the valve member is disposed as an externally open valve on a side of the movable plunger opposite the anchor,an auxiliary member including a valve seat portion and a bearing member and being made of one and the same member is provided, the valve seat portion being abutted against the valve member to block a fluid passage, the bearing member supporting the movable plunger in a reciprocatable manner, andthe auxiliary member is secured to a side of the first core portion opposite the second core portion. 7. The electromagnetically-driven valve mechanism according to claim 5, wherein an electromagnetic coil is disposed on an external circumference of the first core portion and of the second core portion,the yoke portion is disposed on an outer circumference of the electromagnetic coil, andthe first core portion, the magnetic gap, the anchor, the second core portion and the yoke portion form a closed magnetic path in cooperation with one another. 8. The electromagnetically-driven valve mechanism according to claim 6, wherein the spring member is composed of a coil spring and attached to an outer circumference of the movable plunger. 9. The electromagnetically-driven valve mechanism according to claim 5, wherein in a state where the anchor is attached, the movable plunger and the valve member formed integrally with each other have an axial gravity center disposed at a position closer to the anchor than to an axially central portion of a bearing member. 10. The electromagnetically-driven valve mechanism according to claim 5, wherein force other than the electromagnetic force is designed to assist the electromagnetic force against the spring member, andafter the movable plunger has been displaced in a direction of a restricting member by the force other than the magnetic force, the electromagnetic force is applied to the movable plunger. 11. The electromagnetically-driven valve mechanism according to claim 5, wherein after the valve member has initially operatively been opened against the force of the spring member due to a fluid differential pressure between an upstream side and a downstream side of the valve member, the electromagnetic drive mechanism biases the movable plunger in a direction of maintaining or assisting opening operation of the valve member. 12. A high-pressure fuel supply pump comprising: a pressurizing chamber whose capacity is varied by reciprocation of a piston plunger; andan intake valve mechanism composed of the electromagnetically-driven valve mechanism described in claim 1 and disposed at an inlet of the pressurizing chamber;wherein fuel is sucked from the intake valve mechanism when the capacity of the pressurizing chamber is increased and pressurized fuel is discharged from a discharge port when the capacity of the pressurizing chamber is reduced. 13. The high-pressure fuel supply pump according to claim 12, wherein in a state where the electromagnetic drive mechanism is not energized and the fluid differential pressure is reduced to zero, the intake valve member is closed by the spring member. 14. The high-pressure fuel supply pump according to claim 12, wherein the intake valve member is operatively opened or is maintained in an opened state by applying input voltage to the electromagnetic drive mechanism in an intake process of the piston plunger. 15. The high-pressure fuel supply pump according to claim 12, wherein after the intake valve member has operatively been opened against a biasing force of the spring member due to a fluid differential pressure between an intake passage side and a pressurizing chamber side of the intake valve member, the opening operation of the intake valve member is maintained or assisted by applying input voltage to the electromagnetic drive mechanism. 16. The high-pressure fuel supply pump according to claim 12, wherein after the opening state of the valve member has been maintained with input voltage remaining applied to the electromagnetic drive mechanism, the input voltage is turned off in a compression process of the piston plunger to turn off an electric current flowing to the electromagnetic drive mechanism. 17. The high-pressure fuel supply pump according to claim 16, wherein timing to turn off the input voltage applied to the electromagnetic drive mechanism is controlled according to movement of the piston plunger to control a flow rate of fuel discharged at high pressure. 18. The high-pressure fuel supply pump according to claim 12, wherein a value of electric current flowing to the electromagnetic drive mechanism is controlled according to voltage applied to the electromagnetic drive mechanism. 19. The high-pressure fuel supply pump according to claim 12, wherein an application of the input voltage to the electromagnetic drive mechanism and a release of the application are periodically repeated. 20. The high-pressure fuel supply pump according to claim 12, wherein the electromagnetic drive mechanism is unitized into a single component as an electromagnetic drive mechanism unit and the electromagnetic drive mechanism unit is assembled to a pump body. 21. An electromagnetically-driven valve mechanism comprising: a valve member disposed at a fluid inlet port;a movable plunger operated by an electromagnetic force;a spring member biasing the movable plunger in a direction opposite the electromagnetic force; andan electromagnetic drive mechanism for operating the valve member through the movable plunger against the spring member by electromagnetically biasing the movable plunger to open and close the fluid inlet port;the electromagnetic drive mechanism including a core portion adapted to receive the movable plunger inserted therethrough,an annular or cylindrical electromagnetic coil portion attached around the core portion,a cylindrical yoke portion surrounding the outside of the electromagnetic coil portion,a resin-molded body composed of the electromagnetic coil portion and the yoke portion,a connector portion formed integrally with the resin-molded body so as to be used for connection with external equipment, andan external connection terminal made of a conductor and mounted to the connector portion;wherein a means for connecting an end of a lead line forming the electromagnetic coil portion and one end of the external connection terminal is disposed externally of the yoke portion;the core portion is mounted in a cylindrical space defined by an inner circumferential surface of the resin-molded body;the resin-molded body is fixedly press-fitted into an outer circumference of the core portion at an open end of the yoke portion; andan inner diameter of a section of the inner circumferential surface of the resin-molded body that contacts the core portion at a bottom wall of the yoke portion is a smallest inner diameter of the inner circumferential surface of the resin-molded body.
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