US 11,863,042 B2
Power transmission device
Ryuhei Hata, Natori (JP)
Assigned to SUMIDA CORPORATION
Filed by SUMIDA CORPORATION, Tokyo (JP)
Filed on Sep. 7, 2021, as Appl. No. 17/467,576.
Claims priority of application No. 2020-150936 (JP), filed on Sep. 9, 2020.
Prior Publication US 2022/0077756 A1, Mar. 10, 2022
Int. Cl. H02K 49/10 (2006.01)
CPC H02K 49/102 (2013.01) 7 Claims
OG exemplary drawing
 
1. A power transmission device comprising:
an annular transmission unit having an annular first magnetic core and a transmission coil; and
an annular reception unit having an annular second magnetic core and a reception coil, wherein
the transmission unit and the reception unit are arranged to face each other,
the power transmission device transmits power from the transmission unit to the reception unit,
the transmission unit and the reception unit are relatively rotatable about a rotation axis passing through a cavity inside the transmission unit and a cavity inside the reception unit,
the first magnetic core has a structure divided into a plurality of first split cores in a circumferential direction, and the second magnetic core has a structure divided into a plurality of second split cores in the circumferential direction,
the transmission unit includes a first holder member made of resin and holding the first magnetic core,
the reception unit includes a second holder member made of resin and holding the second magnetic core,
the first holder member is in an annular shape,
a part of the first holder member is arranged in accordance with a first surface of the first magnetic core, and the first surface of the first magnetic core axially faces a second surface of the second magnetic core in the reception unit,
the second holder member is in an annular shape,
a part of the second holder member is arranged in accordance with the second surface of the second magnetic core, and the second surface of the second magnetic core axially faces the first surface of the first magnetic core in the transmission unit, and
the transmission coil and the reception coil are aligned along a direction parallel to the rotation axis and face each other via the first and second holder members.