US 12,378,963 B2
Motor-driven scroll electric compressor
Yuya Hattori, Kariya (JP); and Takumi Maeda, Kariya (JP)
Assigned to KABUSHIKI KAISHA TOYOTA JIDOSHOKKI, Kariya (JP)
Filed by KABUSHIKI KAISHA TOYOTA JIDOSHOKKI, Kariya (JP)
Filed on Jun. 2, 2023, as Appl. No. 18/205,177.
Claims priority of application No. 2022-091658 (JP), filed on Jun. 6, 2022.
Prior Publication US 2023/0392599 A1, Dec. 7, 2023
Int. Cl. F04C 27/00 (2006.01); F04C 18/02 (2006.01); F04C 23/02 (2006.01)
CPC F04C 27/009 (2013.01) [F04C 18/0215 (2013.01); F04C 23/02 (2013.01); F04C 2240/50 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A motor-driven scroll compressor comprising:
a housing;
a rotary shaft rotationally supported in the housing;
an electric motor rotating the rotary shaft; and
a compression part including a fixed scroll fixed to the housing and an orbiting scroll revolving in response to the rotation of the rotary shaft while being meshed with the fixed scroll, wherein
the housing includes a separation wall separating a back pressure chamber from a motor chamber accommodating the electric motor, the back pressure chamber from which a back pressure for urging the orbiting scroll toward the fixed scroll is applied, the separation wall having an insertion hole into which the rotary shaft is inserted, and
the separation wall includes a bearing rotationally supporting the rotary shaft, and a seal member that has an annular shape and includes an inner circumference seal portion sealing a gap between the inner circumference seal portion and the rotary shaft and an outer circumference seal portion sealing a gap between the outer circumference seal portion and the separation wall, the seal member sealing the back pressure chamber and the motor chamber, wherein
each of the inner circumference seal portion and the outer circumference seal portion has an end directed toward the bearing,
the end of the inner circumference seal portion is provided closer to the bearing than the end of the outer circumference seal portion is,
the separation wall includes a holding portion that faces the end of the outer circumference seal portion, wherein the end of the inner circumference seal portion is provided closer to the bearing than the holding portion is,
when the motor-driven compressor is in an unsteady state in which a pressure in the motor chamber is greater than a pressure in the back pressure chamber, end of the outer circumference seal portion is in contact with the holding portion, which restricts movement of the seal member toward the bearing, and
when the motor-driven compressor is in a steady state in which the pressure in the back pressure chamber is greater than the pressure in the motor chamber, the end of the outer circumference seal portion is not in contact with the holding portion.