Slider block hard stop

Details Slider block hard stop Slider block hard stop

2000-01-18

2001-07-31

Nguyen, Hoang (Department: 3748)

Rotary expansible chamber devices

Working member has planetary or planetating movement

Helical working member, e.g., scroll

C418S055100, C418S057000

Reexamination Certificate

active

06267573

ABSTRACT:

INTRODUCTION
The present invention is directed to scroll type machines, e.g., scroll compressors, and, more particularly, to a scroll type machine with an improved slider block.
BACKGROUND
Scroll machines, such as scroll compressors using a fixed scroll and an orbiting scroll, are well known in the industry. Each of the scrolls of a scroll compressor has a spiral wrap extending axially from a base plate. The spiral wraps nest with one another to form pockets of varying volume. A fluid introduced into a low pressure area of the pockets is compressed by the cooperating movement of the spiral wraps, and discharged from a high pressure area proximate the center of the wraps. A motor drives a crankshaft which in turn drives the orbiting scroll along its circular orbital path via a slider block. A lubricant is typically introduced to the bearing surfaces of the compressor to reduce the friction incurred by the relative movement of the components of the compressor. Axial forces can force certain adjacent surfaces of the compressor into tight contact with one another, e.g. the top surface of the slider block and the bottom surface of the orbiting scroll, thereby restricting the flow of lubricant and correspondingly increasing friction between such surfaces of the compressor.
U.S. Pat. No. 5,197,868 to Caillat et al. discloses an axially extending recess formed in the top of a bushing of a scroll type machine which provides a limited flow path for lubricant.
It is an object of the present invention to provide a scroll compressor with a slider block which reduces or wholly overcomes some or all of the aforesaid difficulties inherent in prior known devices. Particular objects and advantages of the invention will be apparent to those skilled in the art, that is, those who are knowledgeable and experienced in this field of technology, in view of the following disclosure of the invention and detailed description of the preferred embodiments.
SUMMARY
The principles of the invention may be used to advantage to provide scroll type machines with enhanced lubricating capabilities for components of the compressors.
In accordance with a first aspect a scroll machine has a fixed scroll and an orbiting scroll nested with one another. A crankshaft, having an eccentric pin extending axially from one end thereof, is drivable by a motor. A passageway for the delivery of a lubricant extends through the crankshaft and the eccentric pin. A slider block is received by a bore formed in the orbiting scroll, and a pin bore, which extends axially through the slider block, receives the eccentric pin of the crankshaft. The bore can be formed as a well or pocket bearing or hub extending axially from, or in, a base plate of the orbiting scroll. An end surface of the slider block faces an end surface of the orbiting scroll bore. A projection extends axially from the end surface of the slider block, maintaining a gap between the slider block end surface and the end surface of the orbiting scroll bore through which lubricant may flow.
In accordance with another aspect a scroll compressor has a fixed scroll and an orbiting scroll nested with one another. A hub extends axially from a lower surface of the orbiting scroll and has a bore formed therein. A crankshaft, having an eccentric pin extending axially from one end thereof, is drivable by a motor. A flat drive surface is formed on the eccentric pin. A passageway for the delivery of a lubricant extends through the crankshaft and the eccentric pin. A slider block is received by the bore formed in the orbiting scroll hub, and has a substantially oval shaped pin bore which receives the eccentric pin of the crankshaft. The pin bore extends axially through the slider block and defines a flat driven surface drivable by the flat drive surface of the eccentric pin. A projection extends axially from an end surface of the slider block which faces a lower surface of the orbiting scroll within the bore. The slider block end surface projection maintains a gap between the slider block and the orbiting scroll through which lubricant may flow.
In accordance with yet another aspect, a slider block is formed as a substantially cylindrical member having first and second oppositely facing end surfaces, a bore extending axially from the first end surface and a projection formed on the second end surface and extending axially beyond the second end surface.
Substantial advantage is achieved by scroll machines in accordance with the disclosure, having a slider block with an axially extending projection. In particular, the flow of lubricant across the end surface of the slider block to lubricate bearing surfaces is improved. Also, the forces which act to engage the end surface of the slider block and the facing surface of the orbiting scroll are prevented from closing the gap between these surfaces, thereby reducing friction and resultant degradation of these surfaces.
From the foregoing disclosure, it will be readily apparent to those skilled in the art, that is, those who are knowledgeable or experienced in this area of technology, that the present invention provides a significant technological advance. Preferred embodiments of the scroll compressor with slider block of the present invention can provide a simple construction offering improved lubricating capabilities and reduced wear on moving parts over other known systems. These and additional features and advantages of the invention disclosed here will be further understood from the following detailed disclosure of certain preferred embodiments.


REFERENCES:
patent: 4637786 (1987-01-01), Matoba et al.
patent: 5085565 (1992-02-01), Barito
patent: 5090878 (1992-02-01), Haller
patent: 5197868 (1993-03-01), Caillat et al.
patent: 5312229 (1994-05-01), Sano et al.
patent: 5443374 (1995-08-01), Yoshii et al.
patent: 5496158 (1996-03-01), Barito et al.
patent: 5597297 (1997-01-01), Yamamoto et al.
patent: 5860791 (1999-01-01), Kikuchi

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