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A solenoid includes a stator core, a plunger, a ring core, and a magnetic circuit component. The stator core has a fixed axial end and a free axial end. The free axial end is unfixed. The stator core is formed of a magnetic material. The plunger is slidable along an inner surface of the stator core.

A solenoid includes a stator core, a plunger, a ring core, and a magnetic circuit component. The stator core has a fixed axial end and a free axial end. The free axial end is unfixed. The stator core is formed of a magnetic material. The plunger is slidable along an inner surface of the stator core. The plunger is formed of a magnetic material. The ring core surrounds an outer surface of the free axial end of the stator core. The ring core is formed of a magnetic material. The magnetic circuit component is adjacent to the stator core. The magnetic circuit component conducts magnetic flux with the stator core. The ring core radially conducts radial magnetic flux with the stator core. The ring core axially conducts axial magnetic flux with the magnetic circuit component.

대표청구항 ▼

What is claimed is: 1. A solenoid comprising: a stator core that has a fixed axial end, a free axial end, and an inner surface, the free axial end having an outer surface, the stator core being formed of a magnetic material; a plunger that is slidable along the inner surface of the stator core, the

What is claimed is: 1. A solenoid comprising: a stator core that has a fixed axial end, a free axial end, and an inner surface, the free axial end having an outer surface, the stator core being formed of a magnetic material; a plunger that is slidable along the inner surface of the stator core, the plunger being formed of a magnetic material; a ring core that is disposed around the outer surface of the free axial end of the stator core, the ring core being formed of a magnetic material; and a magnetic circuit component that is adjacent to the stator core, the magnetic circuit component conducting magnetic flux with the stator core, wherein the ring core radially conducts radial magnetic flux with the stator core, the ring core axially conducts axial magnetic flux with the magnetic circuit component, the outer surface of the ring core and the magnetic circuit component form a radial clearance therebetween with respect to a radial direction of the ring core, and the ring core is movable with respect to the radial direction of the ring core in accordance with radial displacement of the free axial end of the stator core. 2. The solenoid according to claim 1, further comprising: an axial bias member that biases the ring core against the magnetic circuit component with respect to an axial direction of the ring core. 3. The solenoid according to claim 1, wherein at least one of the ring core and the magnetic circuit component has an annular protrusion, via which the ring core makes contact with the magnetic circuit component. 4. The solenoid according to claim 1, wherein the stator is radially interposed between the ring core and the plunger. 5. A solenoid comprising: a stator core that has a fixed axial end, a free axial end, and an inner surface, the free axial end having an outer surface, the stator core being formed of a magnetic material; a plunger that is slidable along the inner surface of the stator core, the plunger being formed of a magnetic material; a ring core that is disposed around the outer surface of the free axial end of the stator core, the ring core being formed of a magnetic material; and a magnetic circuit component that is adjacent to the stator core, the magnetic circuit component conducting magnetic flux with the stator core, wherein the ring core radially conducts radial magnetic flux with the stator core, and the ring core axially conducts axial magnetic flux with the magnetic circuit component, the ring core has a breathing groove, through which a radially inner side of the ring core communicates with a radially outer side of the ring core, the solenoid further comprising: a fixing member that is adjacent to the ring core, wherein at least one of the fixing member and the ring core has a rotation regulating unit, via which the fixing member engages with the ring core, and the rotation regulating unit regulates rotation of the ring core with respect to the fixing member. 6. A solenoid comprising: a stator core that has a fixed axial end, a free axial end, and an inner surface, the free axial end having an outer surface, the stator core being formed of a magnetic material; a plunger that is slidable along the inner surface of the stator core, the plunger being formed of a magnetic material; a ring core that is disposed around the outer surface of the free axial end of the stator core, the ring core being formed of a magnetic material; and a magnetic circuit component that is adjacent to the stator core, the magnetic circuit component conducting magnetic flux with the stator core, wherein the ring core radially conducts radial magnetic flux with the stator core, the ring core axially conducts axial magnetic flux with the magnetic circuit component, the ring core has a breathing groove, through which a radially inner side of the ring core communicates with a radially outer side of the ring core, at least one of the magnetic circuit component and the ring core has a rotation regulating unit, via which the magnetic circuit component engages with the ring core, and the rotation regulating unit regulates rotation of the ring core with respect to the magnetic circuit component. 7. A solenoid comprising: a stator core that has a fixed axial end, a free axial end, and an inner surface, the free axial end having an outer surface, the stator core being formed of a magnetic material; a plunger that is slidable along the inner surface of the stator core, the plunger being formed of a magnetic material; a ring core that is disposed around the outer surface of the free axial end of the stator core, the ring core being formed of a magnetic material; and a magnetic circuit component that is adjacent to the stator core, the magnetic circuit component conducting magnetic flux with the stator core, wherein the ring core radially conducts radial magnetic flux with the stator core, the ring core axially conducts axial magnetic flux with the magnetic circuit component, the stator core includes an attractive core and a slide core, which are integrally formed of a magnetic material, the plunger is slidable along an inner surface of the slide core, the attractive core is adapted to magnetically attracting the plunger, and the attractive core and the slide core have a magnetic interrupting portion therebetween for magnetically interrupting the attractive core from the slide core, the solenoid further comprising: a radial bias member biasing the ring core to the upper side. 8. A solenoid comprising: a stator core that has a fixed axial end, a free axial end, and an inner surface, the free axial end having an outer surface, the stator core being formed of a magnetic material; a plunger that is slidable along the inner surface of the stator core, the plunger being formed of a magnetic material; a ring core that is disposed around the outer surface of the free axial end of the stator core, the ring core being formed of a magnetic material; and a magnetic circuit component that is adjacent to the stator core, the magnetic circuit component conducting magnetic flux with the stator core, wherein the ring core radially conducts radial magnetic flux with the stator core, the ring core axially conducts axial magnetic flux with the magnetic circuit component, the stator core includes an attractive core and a slide core, which are integrally formed of a magnetic material, the plunger is slidable along an inner surface of the slide core, the attractive core is adapted to magnetically attracting the plunger, and the attractive core and the slide core have a magnetic interrupting portion therebetween for magnetically interrupting the attractive core from the slide core, the slide core has a free axial end that is unfixed on a side of the free axial end of the stator core, the ring core and the free axial end of the slide core define a first radial clearance therebetween on a radially first side, the ring core and the free axial end of the slide core define a second radial clearance therebetween on a radially second side, which is opposite to the radially first side with respect to a radial direction of the ring core, the second radial clearance is less than the first radial clearance, and the second radial clearance is located on an upper side of the first radial clearance with respect to the direction of gravitational force. 9. The solenoid according to claim 8, further comprising: a radial bias member biasing the ring core toward the second radial clearance. 10. A solenoid comprising: a stator core that has a fixed axial end, a free axial end, and an inner surface, the free axial end having an outer surface, the stator core being formed of a magnetic material; a plunger that is slidable along the inner surface of the stator core, the plunger being formed of a magnetic material; a ring core that is disposed around the outer surface of the free axial end of the stator core, the ring core being formed of a magnetic material; and a magnetic circuit component that is adjacent to the stator core, the magnetic circuit component conducting magnetic flux with the stator core, wherein the ring core radially conducts radial magnetic flux with the stator core, and the ring core axially conducts axial magnetic flux with the magnetic circuit component; and a bias member that biases the ring core against the magnetic circuit component with respect to a substantially axial direction of the ring core, wherein the slide core has a free axial end that is unfixed on a side of the free axial end of the stator core, the ring core and the free axial end of the slide core define a lower radial clearance therebetween on a lower side with respect to the direction of gravitational force, the upper radial clearance is less than the lower radial clearance, and the bias member biases the ring core to the upper side of the ring core. 11. A solenoid comprising: a stator core that has a fixed axial end, a free axial end, and an inner surface, the free axial end having an outer surface, the stator core being formed of a magnetic material; a plunger that is slidable along the inner surface of the stator core, the plunger being formed of a magnetic material; a ring core that is disposed around the outer surface of the free axial end of the stator core, the ring core being formed of a magnetic material; and a magnetic circuit component that is adjacent to the stator core, the magnetic circuit component conducting magnetic flux with the stator core, wherein the ring core radially conducts radial magnetic flux with the stator core, and the ring core axially conducts axial magnetic flux with the magnetic circuit component; and a bias member that biases the ring core against the magnetic circuit component with respect to a substantially axial direction of the ring core, wherein the slide core has a free axial end that is unfixed on a side of the free axial end of the stator core, the ring core and the free axial end of the slide core define a first radial clearance therebetween on a radially first side, the ring core and the free axial end of the slide core define a second radial clearance therebetween on a radially second side, which is opposite to the radially first side with respect to a radial direction of the ring core, the second radial clearance is less than the first radial clearance, the second radial clearance is located on an upper side of the first radial clearance with respect to the direction of gravitational force, and the bias member biases the ring core toward the second radial clearance.