# US 10,872,722 B2 · Shield member and power transmission unit

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- Number: US 10,872,722 B2
- Document ID: US10872722B2
- Status: Granted
- Kind: B2
- Application number: 15/992,310
- Filed: 2018-05-30
- Published: 2018-12-20
- Granted: 2020-12-22
- Earliest claimed: 2017-06-14
- Assignees: Yazaki Corporation
- Applicants: Yazaki Corporation
- Inventors: Antony Wambugu Ngahu; Takashi Shiroki; Takahiro Nakahara; Ryohei Nishizaki; Takayuki Ueda
- Web page: https://patentgrep.com/patent/US10872722B2

## CPC

- H02J 50/10: using inductive coupling
- H01F 27/288: {Shielding}
- H01F 27/36: Electric or magnetic shields or screens (movable for varying inductance H01F21/10)
- H01F 27/363: {made of electrically conductive material}
- H01F 38/14: Inductive couplings
- H02J 50/005: {Mechanical details of housing or structure aiming to accommodate the power transfer means, e.g. mechanical integration of coils, antennas or transducers into emitting or receiving devices}
- H02J 50/12: of the resonant type
- H02J 50/70: involving the reduction of electric, magnetic or electromagnetic leakage fields
- H01F 27/2871: {Pancake coils}
- H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES

## Abstract

A shield member and a power transmission unit each include a shielding wall formed annularly about an axis so as to surround a power transmission coil at a position extending along an intersecting direction. The shielding wall shields a magnetic force generated by the power transmission coil. The shielding wall is formed such that a distance between wall faces facing each other in the intersecting direction is wider at a longer distance from a first side toward a second side in an axial direction.

## Claims

### Claim 1

A shield member comprising:
a shielding wall that is formed annularly around a longitudinal axis, and shields a magnetic force generated by a power transmission coil disposed inside the shielding wall, wherein
the shielding wall includes wall faces facing each other in an intersecting direction that intersects the longitudinal axis,
the wall faces shield a magnetic force generated by the power transmission coil and are formed such that a distance between the wall faces on a first side of the shielding wall than a distance on a second side of the shielding wall in the longitudinal axis.

### Claim 2 (depends on 1)

The shield member according to claim 1, wherein
the shielding wall is formed to have an arcuate cross-sectional shape along an axial direction extending along the longitudinal axis.

### Claim 3 (depends on 1)

The shield member according to claim 1, wherein
the shielding wall is formed to have an arcuate cross-sectional shape along an axial direction extending along the longitudinal axis.

### Claim 4

A power transmission unit, comprising:
a power transmission coil that transmits electric power to a counterpart side power transmission coil in a non-contact manner; and
a shield member that includes a shielding wall that is formed annularly around a longitudinal axis, and shields a magnetic force generated by the power transmission coil disposed inside the shielding wall, wherein
the shielding wall includes wall faces facing each other in an intersecting direction that intersects the longitudinal axis,
the wall faces shield a magnetic force generated by the power transmission coil and are formed such that a distance between the wall faces on a first side of the shielding wall than a distance on a second side of the shielding wall in the longitudinal axis.

### Claim 5 (depends on 1)

The shield member according to claim 1, wherein
the shielding wall is fixed on a support plate in an inner case.

### Claim 6 (depends on 4)

The power transmission unit according to claim 4, wherein
the shielding wall is fixed on a support plate in an inner case.

### Claim 7 (depends on 1)

The shield member according to claim 1, wherein
the shielding wall has both ends open in an axial direction extending along the longitudinal axis.

### Claim 8 (depends on 4)

The power transmission unit according to claim 4, wherein
the shielding wall has both ends open in an axial direction extending along the longitudinal axis.