# US 11,028,849 B2 · Scroll compressor having a rotation shaft with an oil flow path formed therein

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- Number: US 11,028,849 B2
- Document ID: US11028849B2
- Status: Granted
- Kind: B2
- Application number: 15/887,580
- Filed: 2018-02-02
- Published: 2018-08-16
- Granted: 2021-06-08
- Earliest claimed: 2017-02-13
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Munyoung Lee
- Web page: https://patentgrep.com/patent/US11028849B2

## CPC

- F04C 29/023: {Lubricant distribution through a hollow driving shaft (F04C29/025 takes precedence)}
- F01C 21/02: Arrangements of bearings (bearing constructions F16C)
- F04C 18/0215: {where only one member is moving}
- F04C 29/005: {Means for transmitting movement from the prime mover to driven parts of the pump, e.g. clutches, couplings, transmissions}
- F04C 29/028: {Means for improving or restricting lubricant flow}
- F04C 2240/40: Electric motor
- F04C 2240/50: Bearings
- F04C 2240/603: with internal channels for fluid distribution, e.g. hollow shaft
- F04C 2240/605: Shaft sleeves or details thereof
- F04C: ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS (engines F03C); ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F01C: ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES (internal-combustion aspects F02B53/00, F02B55/00)

## Abstract

A rotation shaft of a scroll compressor that includes an oil flow path formed therein, an upper frame support portion which is inserted into an upper frame, a boss insertion portion which is recessed from an upper surface of the upper frame support portion for insertion of the boss portion, and an oil residual groove which is recessed at a predetermined depth from a bottom portion of the boss insertion portion.

## Claims

### Claim 1

A scroll compressor comprising:
a rotation shaft;
an upper frame to support an upper end of the rotation shaft;
a lower frame to support a lower end of the rotation shaft;
an orbital scroll comprising a first base plate that is attached to the upper frame, a first wrap having a spiral shape that extends from an upper surface of the first base plate, and a boss portion that extends from a bottom surface of the first base plate; and
a non-orbital scroll comprising a second base plate that covers an upper side of the orbital scroll, and a second wrap having a spiral shape that extends from a bottom surface of the second base plate,
wherein the rotation shaft comprises:
an oil flow path formed therein,
an upper frame support portion that is inserted into the upper frame,
a boss insertion portion to receive the boss portion, the boss insertion portion being recessed from an upper surface of the upper frame support portion and defined by a bottom surface and an inner peripheral surface of the upper frame support portion,
an oil residual groove that is downwardly recessed from the bottom surface of the boss insertion portion to a depth below the bottom surface of the boss insertion portion,
a first recessed portion that is recessed from the inner peripheral surface of the upper frame support portion,
a second recessed portion that is recessed from an outer peripheral surface of the upper frame support portion,
one or more guide holes which penetrate the upper frame support portion and connects the first recessed portion with the second recessed portion, and
wherein an upper end of the oil flow path spaced apart from the oil residue groove is formed at the bottom surface and the bottom surface of the boss insertion portion is configured to face a lower end of the boss portion, wherein the upper end of the flow path is in communication with the bottom surface of the boss insertion portion, and wherein an oil passage that connects the upper end of the oil flow path with the oil residual groove is formed in the bottom portion of the boss insertion portion.

### Claim 2 (depends on 1)

The scroll compressor of claim 1, wherein the oil passage is configured to be recessed from the bottom surface and the oil residual groove is recessed to a depth that is below the oil passage.

### Claim 3 (depends on 1)

The scroll compressor of claim 1, wherein the oil residual groove is provided at an outer edge portion of the bottom surface of the boss insertion portion.

### Claim 4 (depends on 1)

The scroll compressor of claim 1, wherein the oil residual groove is formed in a recessed portion of a circular band or strip shape along the outer edge of the bottom surface.

### Claim 5 (depends on 1)

The scroll compressor of claim 1, wherein the one or more guide holes comprise:
a first guide hole; and
a second guide hole located above the first guide hole.

### Claim 6 (depends on 1)

The scroll compressor according to claim 1, wherein the oil residual groove is located below the one or more guide holes.

### Claim 7 (depends on 1)

The scroll compressor according to claim 1, further comprising a motor to power the rotation shaft, the motor being coupled to an outer peripheral surface of the rotation shaft.