Solenoid device

Patent metadata

Field	Value
Publication number	US-11069467-B2
Application number	US-201916441011-A
Country	US
Kind code	B2
Filing date	Jun 14, 2019
Priority date	Jun 28, 2018
Publication date	Jul 20, 2021
Grant date	Jul 20, 2021

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 that opens on the rear side; and a first inner wall part expanding in a cylindrical shape on the outer side in the radial direction on an inner wall on the rear side. The first inner wall part has a first step part at the end on the other side in the axial direction. A first cylindrical part of the yoke has a first flange part on the rear side. The first flange part has a hole penetrating in the axial direction. A second space, which communicates a second through hole with the hole when the plunger has moved to a retreat position, is provided between an inner surface of the lid and the plunger and the yoke.

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; and
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,
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,
the lid has a disk shape and comprises an annular circumferential edge part that extends toward the outer side in the radial direction,
the yoke and the lid are fixed to the housing in a state where a first end surface of the first flange part on the other side in the axial direction is in contact with the first step part of the housing body part, and a surface on the other side in the axial direction of the circumferential edge part of the lid is in contact with a first end surface of the first flange part on one side in the axial direction,
the second cylindrical part of the core has a first space, which opens on one side in the axial direction and is recessed toward the other side in the axial direction for inserting or removing the plunger that moves,
the plunger has a second through hole that penetrates along the axial direction,
the second through hole has a third opening that opens on the other side of the second through hole in the axial direction and is positioned on the outer side in the radial direction with respect to the shaft, as viewed in the axial direction,
the first flange part of the yoke has a hole that opens at least on one side in the axial direction and extends toward the other side in the axial direction, and
a second space, which communicates the second through hole with the hole when the plunger has moved to a retreat position in contact with the lid, is provided between an inner surface of the lid on the other side in the axial direction and the plunger and the yoke.

2. The solenoid device according to claim 1 , wherein a volume of the second space at a time when the plunger has moved to the retreat position is the same as or larger than a volume of the first space.

3. The solenoid device according to claim 1 , wherein the hole penetrates the first flange part in the axial direction.

4. The solenoid device according to claim 3 , wherein a fifth opening, which opens on the other side of the hole in the axial direction, is in contact with an end surface of the bobbin on one side in the axial direction and is closed.

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,
wherein the circumferential edge part of the lid is in contact with the first end surface of the first flange part on one side in the axial direction, which extends toward the outer side in the radial direction with respect to a sixth opening that opens on one side of the hole in the axial direction.

6. The solenoid device according to claim 5 , wherein the yoke comprises a protruding part on a yoke end surface of the yoke on one side in the axial direction, and the protruding part protrudes toward one side in the axial direction at a position on an inner side in the radial direction with respect to the sixth opening of the hole, and
the protruding part is positioned so that an end of the protruding part on one side in the axial direction has a gap with the inner surface of the lid on the other side in the axial direction.

7. The solenoid device according to claim 6 , 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.

8. The solenoid device according to claim 7 , wherein the protrusion is in contact with the plunger end surface of the plunger on one side in the axial direction when the plunger has moved to the retreat position.

9. The solenoid device according to claim 8 , wherein the protrusion is disposed at a position that does not cross a fourth opening, which opens on one side of the second through hole in the axial direction, as viewed in the axial direction.

10. The solenoid device according to claim 7 , wherein the second space is a region, which excludes the protruding part and the protrusion from a region surrounded by the inner surface of the lid on the other side in the axial direction, the yoke end surface of the yoke on one side in the axial direction, and the plunger end surface of the plunger on one side in the axial direction, when the plunger has moved to the retreat position.

11. The solenoid device according to claim 1 , wherein the lid is made of a non-magnetic material.

Assignees

• Nidec Tosok Corp

Inventors

• Kuramochi Kenta
• Chen Weiming
• Yasuda Tomohiro

Classifications

• F16K31/0693 Primary

  Pressure equilibration of the armature · CPC title

• F16K31/0613

  with cylindrical slides · CPC title

• H01F7/081 Primary

  Magnetic constructions · CPC title

• H01F2007/086

  Structural details of the armature · CPC title

• H01F7/128

  Encapsulating, encasing or sealing · CPC title