Solenoid device

Patent metadata

Field	Value
Publication number	US-10801629-B2
Application number	US-201916442534-A
Country	US
Kind code	B2
Filing date	Jun 16, 2019
Priority date	Jun 28, 2018
Publication date	Oct 13, 2020
Grant date	Oct 13, 2020

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 cylindrical first inner wall part having a first step part extending toward the outer side in the radial direction; and a cylindrical second inner wall part having a second step part extending toward the outer side in the radial direction. A first cylindrical part has a first flange part. The outer diameter of the first flange part is larger than the inner diameter of the first inner wall part and smaller than the inner diameter of the second inner wall part. A circumferential end part of the first flange part contacts the second step part. The lid is non-magnetic, and a circumferential edge part is held between the first step part and the first flange part.

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 comprises an annular first step part, which extends toward the outer side in the radial direction, on an inner wall of the housing body part connected to the other side in the axial direction from the first opening and expands in a cylindrical shape in the axial direction; and
a second inner wall part that comprises an annular second step part, which extends toward the outer side in the radial direction, on the inner wall of the housing body part connected to the other side of the first inner wall part in the axial direction and expands in a cylindrical shape in the axial direction,
wherein 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 first inner wall part and smaller than an inner diameter of the second inner wall part,
an end surface of the first flange part on one side in the axial direction is in contact with the second step part,
the lid is made of a non-magnetic material, and
a surface on one side in the axial direction of a circumferential edge part on the outer side in the radial direction of the lid is in contact with the first step part, and a surface of the circumferential edge part on the other side in the axial direction is in contact with the end surface of the first flange part on one side in the axial direction, so that the circumferential edge part is fixed to the housing in a state of being held between the first step part and the end surface of the first flange part on one side in the axial direction.

2. The solenoid device according to claim 1 , wherein the bobbin has a cylindrical shape, and
the first flange part of the yoke is fixed to the housing in a state of being held between an end surface of the bobbin on one side in the axial direction and the second step part.

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

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

5. 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.

6. The solenoid device according to claim 5 , wherein a thickness of the circumferential edge part in the axial direction is larger than a length of the first inner wall part in the axial direction.

7. The solenoid device according to claim 5 , wherein the lid body part comprises a protrusion that protrudes toward the side of the plunger on an inner side of the lid body part in the radial direction.

8. The solenoid device according to claim 5 , wherein the lid body part is disposed in a region of the first opening in the axial direction.

Assignees

• Nidec Tosok Corp

Inventors

• Kuramochi Kenta
• Chen Weiming
• Yasuda Tomohiro

Classifications

• H01F7/13

  characterised by pulling-force characteristics · CPC title

• H01F2007/085

  Yoke or polar piece between coil bobbin and armature having a gap, e.g. filled with nonmagnetic material · CPC title

• H01F7/17

  Pivoting and rectilinearly-movable armatures · CPC title

• H01F7/128

  Encapsulating, encasing or sealing · CPC title

• F16K11/0712 Primary

  comprising particular spool-valve sealing means · CPC title