Compressor having sliding portion provided with oil retainer

Patent metadata

Field	Value
Publication number	US-11668308-B2
Application number	US-202217842229-A
Country	US
Kind code	B2
Filing date	Jun 16, 2022
Priority date	Dec 17, 2019
Publication date	Jun 6, 2023
Grant date	Jun 6, 2023

Abstract

A compressor includes a drive shaft having a main shaft and an eccentric portion, 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 and the fitted tubular portion slide relative to each other with an oil film interposed between. The fitted tubular portion has first and second sliding surfaces formed as portions of an inner peripheral surface of the fitted tubular portion in the circumferential direction. The second sliding surface has a smaller axial width than the first sliding surface. A sliding portion between the fitted shaft portion and the fitted tubular portion has a gap adjacent to the second sliding surface into which a lubricating oil flows, and an oil retainer to keep the lubricating oil in the gap from flowing out toward an end surface of the fitted tubular portion.

First claim

The invention claimed is:

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 tubular portion having
a first sliding surface formed as a portion, in a circumferential direction of the fitted tubular portion, of an inner peripheral surface of the fitted tubular portion, and
a second sliding surface formed as another portion of the inner 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 sliding portion between the fitted shaft portion and the fitted tubular portion having a gap adjacent to the second sliding surface in an axial direction of the fitted tubular portion 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 tubular portion,

the second sliding surface being provided at an axial middle portion of the fitted tubular 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, the central portion being closer to the second sliding surface in the axial direction than the end.

2. The compressor of claim 1 , wherein
the compression mechanism includes a piston having an annular shape and a cylinder housing the piston, rotation of the piston on its own axis being regulated,
the fitted tubular portion is the piston, and
the fitted shaft portion is the eccentric portion of the drive shaft.

3. The compressor of claim 1 , wherein
the gap is configured as a groove
having an arc shape and
extending in the circumferential direction, and the groove has a depth that varies in the axial direction.

4. The compressor of claim 3 , wherein
the second sliding surface is provided at an axial middle portion of the fitted tubular portion, and
the groove includes a plurality of grooves, the grooves being formed on both sides of the second sliding surface in the axial direction, and each of the grooves having a depth that increases
from a first edge portion on an end surface of the fitted tubular portion toward a second edge portion on the second sliding surface.

5. The compressor of claim 3 , wherein
the second sliding surface is provided at an axial middle portion of the fitted tubular portion, and
the groove includes a plurality of grooves, the grooves being formed on both sides of the second sliding surface in the axial direction, and each of the grooves having a depth that increases
from a first edge portion on an end surface of the fitted tubular portion and from a second edge portion on the second sliding surface
toward an intermediate portion between the first edge portion and the second edge portion.

6. The compressor of claim 1 , wherein
the compression mechanism includes a piston having an annular shape and a cylinder housing the piston,
the fitted tubular portion is a tubular bearing of the cylinder, and
the fitted shaft portion is the main shaft of the drive shaft.

7. 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 tubular portion having
a first sliding surface formed as a portion, in a circumferential direction of the fitted tubular portion, of an inner peripheral surface of the fitted tubular portion, and
a second sliding surface formed as another portion of the inner 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 sliding portion between the fitted shaft portion and the fitted tubular portion having a gap adjacent to the second sliding surface in an axial direction of the fitted tubular portion 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 tubular portion,

the gap being configured as a groove
having an arc shape and
extending in the circumferential direction, and

the groove having a depth that varies in the axial direction.

8. The compressor of claim 7 , wherein
the second sliding surface is provided at an axial middle portion of the fitted tubular portion, and
the groove includes a plurality of grooves, the grooves being formed on both sides of the second sliding surface in the axial direction, and each of the grooves having a depth that increases
from a first edge portion on an end surface of the fitted tubular portion
toward a second edge portion on the second sliding surface.

9. The compressor of claim 7 , wherein
the second sliding surface is provided at an axial middle portion of the fitted tubular portion, and
the groove includes a plurality of grooves, the grooves being formed on both sides of the second sliding surface in the axial direction, and each of the grooves having a depth that increases
from a first edge portion on an end surface of the fitted tubular portion and from a second edge portion on the second sliding surface
toward an intermediate portion between the first edge portion and the second edge portion.

10. The compressor of claim 7 , wherein
the compression mechanism includes a piston having an annular shape and a cylinder housing the piston, rotation of the piston on its own axis being regulated,
the fitted tubular portion is the piston, and
the fitted shaft portion is the eccentric portion of the drive shaft.

11. The compressor of claim 7 , wherein
the compression mechanism includes a piston having an annular shape and a cylinder housing the piston,
the fitted tubular portion is a tubular bearing of the cylinder, and
the fitted shaft portion is the main shaft of the drive shaft.

12. 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 tubular portion having
a first sliding surface formed as a portion, in a circumferential direction of the fitted tubular portion, of an inner peripheral surface of the fitted tubular portion, and
a second sliding surface formed as another portion of the inner 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 sliding portion between the fitted shaft portion and the fitted tubular portion having a gap adjacent to the second sliding surface in an axial direction of the fitted tubular portion and into which a lubricating oil flows, and
a

Assignees

• Daikin Ind Ltd

Inventors

• Masuda Masanori

Classifications

• F04C29/028 Primary

  Means for improving or restricting lubricant flow · CPC title

• F01C21/106

  with a radial surface, e.g. cam rings · CPC title

• F04C2240/605

  Shaft sleeves or details thereof · CPC title

• F04C2240/20

  Rotors · CPC title

• F04C18/322

  with vanes hinged to the outer member and reciprocating with respect to the outer member · CPC title