An electromagnetic linear valve includes: (a) a plunger including a large outside-diameter portion and a small outside-diameter portion, and (b) a housing having a through-hole and including a large inside-diameter portion in which the large outside-diameter portion is inserted with a clearance bein
An electromagnetic linear valve includes: (a) a plunger including a large outside-diameter portion and a small outside-diameter portion, and (b) a housing having a through-hole and including a large inside-diameter portion in which the large outside-diameter portion is inserted with a clearance being defined between the large inside-diameter portion and the large outside-diameter portion, and a small inside-diameter portion in which the small outside-diameter portion is inserted with a clearance being defined between the small inside-diameter portion and the outside-diameter portion. The plunger has an end portion which serves as a valve body that is to be seated on a valve seat constituted by an opening of the through-hole. The large outside-diameter portion has an end portion constituted by another end portion of the plunger that is opposite to the above-described end portion of the plunger. The clearance between the small inside-diameter portion and the small outside-diameter portion is smaller than the clearance between the large inside-diameter portion and the large outside-diameter portion.
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1. An electromagnetic linear valve comprising: a housing having a dividing portion that divides an interior of said housing into a first fluid chamber and a second fluid chamber, said housing having a through-hole that passes through said dividing portion such that said first and second fluid chambe
1. An electromagnetic linear valve comprising: a housing having a dividing portion that divides an interior of said housing into a first fluid chamber and a second fluid chamber, said housing having a through-hole that passes through said dividing portion such that said first and second fluid chambers are to be in communication with each other via said through-hole, said interior of said housing being filled with a working fluid;a plunger movable in an axial direction thereof and located in said first fluid chamber in which said through-hole opens through an opening thereof, said plunger including a first end portion which serves as a valve body and which is seatable on said opening serving as a valve seat;an inlet port provided in said housing and being in communication with said second fluid chamber;an outlet port provided in said housing and being in communication with said first fluid chamber;an elastic body forcing said plunger in a forcing direction that causes said first end portion to be moved toward said opening; anda coil disposed to surround said housing and configured to form a magnetic field that causes said plunger to be moved in a direction that is opposite to the forcing direction,wherein said plunger has a stepped shape, and includes (a) a large outside-diameter portion which is made of a ferromagnetic material and which includes a second end portion constituted by another end portion of said plunger that is opposite to said first end portion of said plunger, and (b) a small outside-diameter portion which is made of a ferromagnetic material and which is contiguous to said large outside-diameter portion so as to be located on a side of said first end portion of said plunger,wherein said housing includes (c) a large inside-diameter portion which is made of a ferromagnetic material and in which said large outside-diameter portion is inserted with a clearance being defined between said large inside-diameter portion and said large outside-diameter portion, and (d) a small inside-diameter portion which is made of a ferromagnetic material and in which said small outside-diameter portion is inserted with a clearance being defined between said small inside-diameter portion and said small outside-diameter portion, said small inside-diameter portion being contiguous to said large inside-diameter portion,and wherein said clearance between said small inside-diameter portion and said small outside-diameter portion is smaller than said clearance between said large inside-diameter portion and said large outside-diameter portion. 2. The electromagnetic linear valve according to claim 1, being constructed such that, upon movement of said plunger within said housing, said small outside-diameter portion and said small inside-diameter portion are slidingly contactable with each other, without said large outside-diameter portion and said large inside-diameter portion being in sliding contact with each other. 3. The electromagnetic linear valve according to claim 1, wherein a ratio of an outside diameter of said small outside-diameter portion to an outside diameter of said large outside-diameter portion is not smaller than ½ and is not larger than ⅘. 4. The electromagnetic linear valve according to claim 1, wherein a ratio of said clearance between said small inside-diameter portion and said small outside-diameter portion to said clearance between said large inside-diameter portion and said large outside-diameter portion is not smaller than 1/10 and is not larger than ⅕. 5. The electromagnetic linear valve according to claim 1, wherein said plunger includes a rod portion which is contiguous to said small outside-diameter portion and which is located on a side of said first end portion of said plunger, said plunger being formed of a single material piece that is made of a ferromagnetic material,wherein said rod portion has an outside diameter smaller than an outside diameter of said small outside-diameter portion, and includes a rod end portion which serves as said valve body,and wherein a surface of at least a portion of said plunger, which serves as said valve body, is constituted by a hardened surface subjected to a surface heat treatment for increasing a hardness of said surface. 6. The electromagnetic linear valve according to claim 1, wherein said plunger includes a rod portion which is contiguous to said small outside-diameter portion and which is located on a side of said first end portion of said plunger,wherein said rod portion has an outside diameter smaller than an outside diameter of said small outside-diameter portion, and includes a rod end portion which serves as said valve body,wherein said first fluid chamber has:(a) a large-outside-diameter-portion/small-inside-diameter-portion fluid chamber defined between shoulder surfaces, one of which interconnects an outer circumferential surface of said large outside-diameter portion and an outer circumferential surface of said small outside-diameter portion, and the other of which interconnects an inner circumferential surface of said large inside-diameter portion and an inner circumferential surface of said small inside-diameter portion; and(b) a small-outside-diameter-portion/dividing-portion fluid chamber defined between said dividing portion and a shoulder surface that interconnects said outer circumferential surface of said small outside-diameter portion and an outer circumferential surface of said rod portion,and wherein said small inside-diameter portion has, in addition to a communication passage constituted by said clearance between said small outside-diameter portion and said small inside-diameter portion, a small-inside-diameter-portion communication passage communicating between said large-outside-diameter-portion/small-inside-diameter-portion fluid chamber and said small-outside-diameter- portion/dividing-portion fluid chamber. 7. The electromagnetic linear valve according to claim 1, wherein said plunger includes a rod portion which is contiguous to said small outside-diameter portion and which is located on a side of said first end portion of said plunger,wherein said rod portion has an outside diameter smaller than an outside diameter of said small outside-diameter portion, and includes a rod end portion which serves as said valve body,wherein said housing includes a rod insertion portion contiguous to one of opposite ends of said small inside-diameter portion which is remote from said large inside-diameter portion, such that said rod portion is inserted in said rod insertion portion with a clearance being defined between said rod portion and said rod insertion portion, said rod insertion portion having an inside diameter smaller than an inside diameter of said small inside-diameter portion,and wherein said clearance between said small inside-diameter portion and said small outside-diameter portion is smaller than said clearance between said rod portion and said rod insertion portion. 8. The electromagnetic linear valve according to claim 7, wherein said first fluid chamber has a small-outside-diameter-portion/dividing-portion fluid chamber defined between said dividing portion and a shoulder surface that interconnects an outer circumferential surface of said small outside-diameter portion and an outer circumferential surface of said rod portion,wherein said small-outside-diameter-portion/dividing-portion fluid chamber has (a) a small-outside-diameter-portion/rod-insertion-portion fluid chamber defined between shoulder surfaces, one of which interconnects an outer circumferential surface of said small outside-diameter portion and an outer circumferential surface of said rod portion, and the other of which interconnects an inner circumferential surface of said small inside-diameter portion and an inner circumferential surface of said rod insertion portion, and (b) a rod-insertion-portion/dividing-portion fluid chamber defined between said rod insertion portion and said dividing portion,wherein said rod insertion portion has, in addition to a communication passage constituted by said clearance between said rod portion and said rod insertion portion, a rod-insertion-portion communication passage communicating between said small-outside-diameter-portion/rod-insertion-portion fluid chamber and said rod-insertion-portion/dividing-portion fluid chamber,wherein said rod-insertion-portion communication passage has an opening that opens to an outer circumferential surface of said housing,and wherein said opening serves as said outlet port. 9. The electromagnetic linear valve according to claim 8, wherein said first fluid chamber further has a large-outside-diameter-portion/small-inside-diameter-portion fluid chamber defined between shoulder surfaces, one of which interconnects an outer circumferential surface of said large outside-diameter portion and an outer circumferential surface of said small outside-diameter portion, and the other of which interconnects an inner circumferential surface of said large inside-diameter portion and an inner circumferential surface of said small inside-diameter portion,wherein said small inside-diameter portion has, in addition to a communication passage constituted by said clearance between said small outside-diameter portion and said small inside-diameter portion, a small-inside-diameter-portion communication passage communicating between said large-outside-diameter-portion/small-inside-diameter-portion fluid chamber and said small-outside-diameter-portion/dividing-portion fluid chamber,and wherein said small-inside-diameter-portion communication passage communicates between said large-outside-diameter-portion/small-inside-diameter-portion fluid chamber and said small-outside-diameter-portion/rod-insertion-portion fluid chamber of said small-outside-diameter-portion/dividing-portion fluid chamber. 10. The electromagnetic linear valve according to claim 1, wherein said housing includes (a) a large cylindrical member made of a ferromagnetic material and having an inside diameter that is larger than an outside diameter of said large outside-diameter portion, and (b) a small cylindrical member made of a ferromagnetic material and including a fitted portion that is fitted in said large cylindrical member, said fitted portion having an inside diameter that is larger than an outside diameter of said small outside-diameter portion and smaller than an outside diameter of said large outside-diameter portion,wherein said fitted portion of said small cylindrical member serves as said small inside-diameter portion, while a portion of said large cylindrical member, in which said fitted portion is not fitted, serves as said large inside-diameter portion,said electromagnetic linear valve being used while being attached to a base body,wherein said large cylindrical member has an annular groove at which said large cylindrical member is to be tightened by the base body when said electromagnetic linear valve is attached to the base body, said annular groove being provided in an outer circumferential surface of a portion of said large cylindrical member in which said fitted portion is fitted,and wherein said large cylindrical member and said fitted portion of said small cylindrical member cooperate with each other to define an annular space between an inner circumferential surface of said large cylindrical member and an outer circumferential surface of said fitted portion, such that said annular space is located in a same position as said annular groove in the axial direction. 11. The electromagnetic linear valve according to claim 1, wherein said plunger is movable in a direction which causes said first end portion of said plunger to be moved toward said opening of said through-hole and which is defined as said forcing direction, and is movable also in a direction which causes said first end portion of said plunger to be moved away from said opening of said through-hole and which is defined as a separating direction,wherein said housing includes a core portion which is made of a ferromagnetic material and which is constituted by a separating-direction-side end portion of said housing, said separating-direction-side end portion being a downstream end portion of said housing in the separating direction, said core portion being opposed to an end face of said second end portion of said plunger,and wherein said elastic body is disposed between said core portion and said large outside-diameter portion of said plunger, and generates an elastic force forcing said plunger in said forcing direction,said electromagnetic linear valve being constructed such that, upon formation of the magnetic field by said coil, a magnetic force is generated between said core portion and said large outside-diameter portion, and acts in a direction that causes said core portion and said large outside-diameter portion to be attracted toward each other. 12. The electromagnetic linear valve according to claim 11, comprising a cylindrical-shaped coil housing which is made of a ferromagnetic material and which is fixedly disposed on an outer circumferential surface of said housing such that said coil is surrounded by said coil housing, wherein a separating-direction-side end portion of said coil housing, which is a downstream end portion of said coil housing in the separating direction, is located on a downstream side, in the separating direction, of an end face of an end portion of said core portion, which is located on a side of said first end portion of said plunger,and wherein a forcing-direction-side end portion of said coil housing, which is a downstream end portion of said coil housing in the forcing direction, is located on a downstream side, in the forcing direction, of a shoulder surface interconnecting an inner circumferential surface of said large inside-diameter portion and an inner circumferential surface of said small inside-diameter portion. 13. An electromagnetic linear valve comprising: a housing having a dividing portion that divides an interior of said housing into a first fluid chamber and a second fluid chamber, said housing having a through-hole that passes through said dividing portion such that said first and second fluid chambers are to be in communication with each other via said through-hole, said interior of said housing being filled with a working fluid;a plunger movable in an axial direction thereof and located in said first fluid chamber in which said through-hole opens through an opening thereof, said plunger including a first end portion which serves as a valve body and which is seatable on said opening serving as a valve seat;an inlet port provided in said housing and being in communication with said second fluid chamber;an outlet port provided in said housing and being in communication with said first fluid chamber;an elastic body forcing said plunger in a forcing direction that causes said first end portion to be moved toward said opening; anda coil disposed to surround said housing and configured to form a magnetic field that causes said plunger to be moved in a direction that is opposite to the forcing direction,wherein said plunger has two flux-passing portions which are contiguous to each other in the axial direction, such that a magnetic flux is caused to flow in the axial direction upon formation of a magnetic field by said coil,and wherein one of said two flux-passing portions is (a) a first flux-passing portion including an end portion that is constituted by a second end portion of said plunger, while the other of said two flux-passing portions is (b) a second flux-passing portion that is located on a side of said first end portion of said plunger, such that the magnetic flux can be caused to flow by a larger amount within said first flux-passing portion than within said second flux-passing portion,said electromagnetic linear valve being constructed such that, upon movement of said plunger within said housing, said second flux-passing portion and said housing are slidingly contactable with each other, while said first flux-passing portion and said housing are spaced apart from each other by a clearance defined therebetween without said first flux-passing portion and said housing being in sliding contact with each other, said clearance defined between said first flux-passing portion and said housing being larger than a clearance defined between said second flux-passing portion and said housing,and said electromagnetic linear valve being constructed such that, upon flow of the magnetic flux through said first and second flux-passing portions, a part of the magnetic flux, which is disabled to flow to said second flux-passing portion as a result of magnetic saturation of said second flux-passing portion, is caused to flow between said first flux-passing portion and said housing via said clearance defined therebetween, while a part of the magnetic flux, which is allowed to flow to said second flux-passing portion, is caused to flow between said second flux-passing portion and said housing.
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이 특허에 인용된 특허 (4)
Goossens, Andre F. L.; Himme, Luc Van, Electromagnet valve.
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