# US 12,112,885 B2 · Solenoid coil

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- Number: US 12,112,885 B2
- Document ID: US12112885B2
- Status: Granted
- Kind: B2
- Application number: 17/597,076
- Filed: 2020-04-20
- Published: 2022-10-06
- Granted: 2024-10-08
- Earliest claimed: 2019-06-26
- Assignees: Hitachi Astemo, Ltd.
- Applicants: Hitachi Astemo, Ltd.
- Inventors: Yuichiro Tanaka; Shinji Seto; Norio Nakazato; Shunsuke Mori; Yohei Katayama; Teruaki Yamanaka; Motohiro Hirao
- Web page: https://patentgrep.com/patent/US12112885B2

## CPC

- H01F 5/06: Insulation of windings
- H01F 5/02: wound on non-magnetic supports, e.g. formers
- H01F 27/325: {Coil bobbins (formers for coils in general H01F5/02)}
- H01F 7/16: Rectilinearly-movable armatures (H01F7/17 takes precedence)
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES

## Abstract

The solenoid coil includes a coil having a first end surface and a second end surface on its both ends in an axial direction, a member which is in contact with the first end surface, and has a groove through which the wire material of the coil passes, and an insulating resin formed to coat at least an outer circumferential surface and the second end surface of the coil. The resin with a substantially U-shaped section is continuously coated on at least a part of an inner circumferential surface of the coil via an area from the outer circumferential surface to the second end surface.

## Claims

### Claim 1

A solenoid coil, comprising:
a coil having a first end surface and a second end surface on its both ends in an axial direction;
a member which is in contact with the first end surface, and has a groove through which the wire material of the coil passes;
an insulating resin formed to coat at least an outer circumferential surface and the second end surface of the coil, wherein the resin with a substantially U-shaped section is continuously coated on at least a part of an inner circumferential surface of the coil via an area from the outer circumferential surface to the second end surface; and
a cylindrical bobbin disposed at an inner side of the coil, wherein
the bobbin is provided with the member in the form of a flange at a side of the first end surface, and
at least a part of the wire material is wound around an outer circumference of the bobbin, and
the resin is coated on the inner circumferential surface of the coil at a part where the wire material is not wound around the outer circumference of the bobbin.

### Claim 2 (depends on 1)

The solenoid coil according to claim 1, wherein the resin is coated on the inner circumferential surface of the coil is coated.

### Claim 3 (depends on 1)

The solenoid coil according to claim 1, wherein the member includes a groove through which a winding start leading wire of the wire material passes, and a groove through which a winding end leading wire of the wire material passes.

### Claim 4 (depends on 1)

The solenoid coil according to claim 1, wherein the resin is formed using a powder resin, a liquid resin, or an ultraviolet curing type resin.