US 11,674,514 B2
Compressor with a fitted shaft portion having two sliding surfaces and an oil retainer
Masanori Masuda, Osaka (JP)
Assigned to Daikin Industries, Ltd., Osaka (JP)
Filed by DAIKIN INDUSTRIES, LTD., Osaka (JP)
Filed on Jun. 16, 2022, as Appl. No. 17/842,254.
Application 17/842,254 is a continuation of application No. PCT/JP2020/044495, filed on Nov. 30, 2020.
Claims priority of application No. JP2019-227029 (JP), filed on Dec. 17, 2019.
Prior Publication US 2022/0307498 A1, Sep. 29, 2022
Int. Cl. F04C 29/02 (2006.01); F04C 29/00 (2006.01); F04C 18/356 (2006.01)
CPC F04C 29/023 (2013.01) [F04C 18/356 (2013.01); F04C 29/0057 (2013.01); F04C 29/028 (2013.01); F04C 2240/60 (2013.01); F04C 2240/603 (2013.01); F04C 2240/605 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A compressor, comprising:
a drive shaft having a main shaft and an eccentric portion that is eccentric relative to a center of the main shaft; and
a compression mechanism having a fitted tubular portion into which a fitted shaft portion of the drive shaft is fitted,
the fitted shaft portion of the drive shaft and the fitted tubular portion sliding relative to each other with an oil film interposed therebetween,
the fitted shaft portion having
a first sliding surface formed as a portion, in a circumferential direction, of an outer peripheral surface of the fitted shaft portion, and
a second sliding surface formed as an other portion of the outer peripheral surface in the circumferential direction, the second sliding surface having a smaller axial width than an axial width of the first sliding surface,
a gap adjacent to the second sliding surface in an axial direction and into which a lubricating oil flows, and
an oil retainer configured to keep the lubricating oil in the gap from flowing out toward an end surface of the fitted shaft portion;
the second sliding surface being provided at an axial middle portion of the fitted shaft portion,
the oil retainer being configured as a boundary portion between the first sliding surface and the gap, and
the boundary portion having a central portion that protrudes further toward the first sliding surface than an end of the boundary portion in a lubricating oil flow-out direction.