US 11,732,714 B2
Scroll compressor including bushing mounted on eccentric shaft containing cylindrical and auxiliary weight portions and balancer disposed above annular rotor remote from back pressure chamber
Hirofumi Kuma, Kariya (JP); Kazuo Murakami, Kariya (JP); and Masashi Wakui, Kariya (JP)
Assigned to KABUSHIKI KAISHA TOYOTA JIDOSHOKKI, Kariya (JP)
Filed by KABUSHIKI KAISHA TOYOTA JIDOSHOKKI, Kariya (JP)
Filed on Jun. 30, 2021, as Appl. No. 17/363,972.
Application 17/363,972 is a division of application No. 16/367,699, filed on Mar. 28, 2019, granted, now 11,193,490.
Claims priority of application No. 2018-070071 (JP), filed on Mar. 30, 2018; and application No. 2019-046130 (JP), filed on Mar. 13, 2019.
Prior Publication US 2021/0324857 A1, Oct. 21, 2021
Int. Cl. F04C 29/00 (2006.01); F04C 18/02 (2006.01); F04C 23/00 (2006.01)
CPC F04C 29/0021 (2013.01) [F04C 18/0215 (2013.01); F04C 23/008 (2013.01); F04C 29/00 (2013.01); F04C 2240/56 (2013.01); F04C 2240/807 (2013.01); F05B 2240/50 (2013.01); F05B 2260/966 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A scroll compressor comprising:
a rotary shaft;
an eccentric shaft that is provided at a distal end of the rotary shaft;
a stationary scroll that has a stationary-side base plate and a stationary-side volute wall extending from the stationary-side base plate;
a moveable scroll that is configured to compress fluid by rotation of the rotary shaft, the movable scroll including
a disk-shaped movable-side base plate that faces the stationary-side base plate,
a movable-side volute wall that extends from the movable-side base plate toward the stationary-side base plate and meshes with the stationary-side volute wall, and
a cylindrical boss portion that extends from the movable-side base plate in a direction away from the stationary-side base plate and is arranged about a central axis of the movable-side base plate;
a shaft supporting member that has an insertion hole in which the rotary shaft is inserted, a rotary shaft bearing for supporting the rotary shaft being arranged in the insertion hole;
a bushing that has a fitting hole in which the eccentric shaft is fitted;
a scroll bearing that is fitted to an inner circumferential surface of the boss portion and fitted to an outer circumferential surface of the bushing; and
a balancer that rotates integrally with the rotary shaft and has a main weight portion located on an opposite side of a central axis of the rotary shaft from the eccentric shaft,
an electric motor configured to rotate the rotary shaft, and
a back pressure chamber that is defined between the movable-side base plate and the shaft supporting member, wherein
the central axis of the movable-side base plate is located at a different position from a central axis of the eccentric shaft,
the bushing includes
a cylindrical portion that is fitted to an inner circumferential surface of the scroll bearing, the fitting hole extending through the cylindrical portion along an axial direction of the cylindrical portion, and
an auxiliary weight portion that is located on an outer side of the cylindrical portion in a radial direction,
the fitting hole is provided at a position where a moment about the eccentric shaft generated by a centrifugal force acting on the movable scroll due to rotation of the rotary shaft and a moment about the eccentric shaft generated by a centrifugal force acting on the auxiliary weight portion due to rotation of the rotary shaft are in opposite directions,
the balancer is located between the rotary shaft bearing and the movable-side base plate
the balancer and the auxiliary weight portion are arranged in the back pressure chamber,
a swing range of the bushing is limited by the contact between the balancer and the auxiliary weight portion, and
as viewed from the radial direction of the rotary shaft, the balancer and the auxiliary weight portion overlap each other.