Solenoid device

Patent metadata

Field	Value
Publication number	US-11289257-B2
Application number	US-201916441010-A
Country	US
Kind code	B2
Filing date	Jun 14, 2019
Priority date	Jun 28, 2018
Publication date	Mar 29, 2022
Grant date	Mar 29, 2022

Abstract

A solenoid device includes a yoke, a core, a shaft, a bobbin, a coil, a plunger, a lid, and a housing. A housing body part of the housing has a first opening; a first inner wall part expanding toward the outer side in the radial direction on an inner wall; and a first caulking part extending from the rear side end. The first inner wall part has a first step part extending toward the outer side in the radial direction at an end on the other side in the axial direction. A first cylindrical part of the yoke has a first flange part. The first flange part contacts the first step part with an end surface on the other side in the axial direction. The first caulking part is bent toward the inner side in the radial direction to contact a circumferential edge part of the lid.

First claim

What is claimed is:

1. A solenoid device for moving a shaft in an axial direction with a magnetic force generated by excitation of a coil, the solenoid device comprising:
a yoke comprising a first cylindrical part that extends in the axial direction;
a core positioned on the other side in the axial direction with respect to the yoke and comprising a second cylindrical part that extends in the axial direction;
the shaft moving in the axial direction inside the second cylindrical part;
a bobbin disposed on an outer side of the first cylindrical part and the second cylindrical part in a radial direction;
the coil wound on the bobbin;
a plunger moving in the axial direction inside the first cylindrical part;
a lid positioned on one side in the axial direction with respect to the yoke and the plunger; and
a housing housing the shaft, the yoke, the core, the bobbin, the coil, the plunger, and the lid,
wherein the housing comprises a cylindrical housing body part, and
the housing body part comprises:
a first opening that opens at an end on one side in the axial direction;
a first inner wall part that is adjacent to the first opening and expands in a cylindrical shape in the axial direction on the outer side in the radial direction on an inner wall of the housing body part on one side in the axial direction; and
a first caulking part that extends from an end of the first inner wall part on one side in the axial direction toward one side in the axial direction,
wherein the first inner wall part comprises an annular first step part that extends in the radial direction at an end on the other side in the axial direction,
the first cylindrical part of the yoke comprises an annular first flange part that protrudes toward the outer side in the radial direction on one side of the first cylindrical part in the axial direction,
an outer diameter of the first flange part is larger than an inner diameter of the inner wall of the housing body part and slightly smaller than an inner diameter of the first inner wall part,
the lid has a disk shape, and an outer diameter of the lid is larger than the inner diameter of the inner wall of the housing body part and smaller than the inner diameter of the first inner wall part,
the first flange part is in contact with the first step part with a first end surface of the first flange part on the other side in the axial direction, and
the first caulking part is bent toward an inner side in the radial direction to be in contact with a circumferential edge part of the lid, so that the lid is fixed to the housing with the circumferential edge part in contact with a first end surface of the first flange part on one side in the axial direction.

2. The solenoid device according to claim 1 , wherein the first flange part is further in contact with an inner surface of the first inner wall part with a first circumferential end part of the first flange part on the outer side in the radial direction.

3. The solenoid device according to claim 1 , wherein the bobbin has a cylindrical shape, and
the first end surface on the other side in the axial direction of the first flange part of the yoke is in contact with an end surface of the bobbin on one side in the axial direction.

4. The solenoid device according to claim 3 , wherein the first end surface of the first flange part on the other side in the axial direction and the end surface of the bobbin on one side in the axial direction are located on the same plane.

5. The solenoid device according to claim 1 , wherein the lid closes the first opening in a state of being fixed to the housing.

6. The solenoid device according to claim 5 , wherein the lid is made of a non-magnetic material.

7. The solenoid device according to claim 1 , wherein the first cylindrical part and the first flange part of the yoke are integrated.

8. The solenoid device according to claim 1 , wherein the lid comprises:
a lid body part disposed opposite to a plunger end surface of the plunger on one side in the axial direction;
an annular inclined part extending from an end of the lid body part on the outer side in the radial direction toward the outer side in the radial direction as the inclined part goes toward the other side in the axial direction; and
the annular circumferential edge part protruding from an end of the inclined part on the outer side in the radial direction toward the outer side in the radial direction.

9. The solenoid device according to claim 8 , wherein the lid body part comprises a protrusion that protrudes toward the side of the plunger on the inner side of the lid body part in the radial direction.

10. The solenoid device according to claim 1 , wherein the housing body part comprises a cylindrical second inner wall part that expands in the axial direction on the outer side in the radial direction on the inner wall of the housing body part, which is adjacent to an end of the bobbin on the other side in the axial direction and extends toward the other side in the axial direction,
the second inner wall part comprises an annular second step part that extends in the radial direction at an end on one side in the axial direction,
the core comprises an annular second flange part that protrudes in the radial direction on one side of the core in the axial direction,
an outer diameter of the second flange part is slightly smaller than an inner diameter of the second inner wall part, and
the second flange part is in contact with the second step part with a second end surface of the second flange part on one side in the axial direction.

11. The solenoid device according to claim 10 , wherein the second flange part is further in contact with an inner surface of the second inner wall part with a second circumferential end part of the second flange part on the outer side in the radial direction.

12. The solenoid device according to claim 10 , wherein a cylindrical collar is inserted between a yoke outer circumferential surface of the yoke on the other side in the axial direction and a core outer circumferential surface of the core on one side in the axial direction, and
the yoke and the core are coupled via the collar with a gap.

13. The solenoid device according to claim 12 , wherein a thickness of the collar is smaller than a thickness of the first cylindrical part of the yoke.

14. The solenoid device according to claim 12 , wherein the collar is made of a non-magnetic material.

15. The solenoid device according to claim 14 , wherein the other side of the yoke in the axial direction is provided with an inclined surface part that is inclined toward the inner side in the radial direction as the inclined surface part goes toward the other side in the axial direction.

Assignees

• Nidec Tosok Corp

Inventors

• Kuramochi Kenta
• Chen Weiming
• Yasuda Tomohiro

Classifications

• H01F7/16

  Rectilinearly-movable armatures (H01F7/17 takes precedence) · CPC title

• H01F2007/086

  Structural details of the armature · CPC title

• F16K31/0613 Primary

  with cylindrical slides · CPC title

• H01F7/128

  Encapsulating, encasing or sealing · CPC title

• H01F7/081 Primary

  Magnetic constructions · CPC title