Scroll fluid machine with improved reliability and performance of components thereof

Patent metadata

Field	Value
Publication number	US-10415389-B2
Application number	US-201415504400-A
Country	US
Kind code	B2
Filing date	Sep 10, 2014
Priority date	Sep 10, 2014
Publication date	Sep 17, 2019
Grant date	Sep 17, 2019

Abstract

The purpose of the present invention is to provide a scroll fluid machine, the reliability of which is ensured and which can be manufactured with high productivity. The present invention provides a scroll fluid machine comprising: a stationary scroll having a spiral wrap upstanding therefrom; an orbiting scroll provided facing the stationary scroll and orbiting; a casing provided outside the orbiting scroll; a drive shaft for causing the orbiting scroll to orbit; an orbiting bearing for transmitting the rotational movement of the drive shaft to the orbiting scroll; and a plurality of rotation prevention mechanisms for preventing the orbiting scroll from rotating. The scroll fluid machine is characterized in that: the rotation prevention mechanisms have crankshafts and also have crank bearings for supporting the crankshafts; and the gap between each of the crankshafts and the corresponding one of the crank bearings is set to be greater than the gap between the drive shaft and the orbiting bearing.

First claim

The invention claimed is:

1. A scroll fluid machine comprising:
a stationary scroll in which a spiral lap part is installed;
an orbiting scroll that is provided opposite to the stationary scroll and orbits;
a casing that is provided outside the orbiting scroll;
a drive shaft that makes the orbiting scroll orbit;
an orbiting bearing that transmits a rotational movement of the drive shaft to the orbiting scroll; and
a plurality of rotation prevention mechanisms that prevent rotation of the orbiting scroll, wherein:
the rotation prevention mechanism has a crankshaft and a crank bearing that supports the crankshaft; and a gap between the crankshaft and the crank bearing is made larger than a gap between an inner race of the orbiting bearing and rolling elements of the orbiting bearing.

2. The scroll fluid machine according to claim 1 , wherein a locating hole that locates the orbiting scroll with respect to the casing is provided in each of the casing and the orbiting scroll.

3. The scroll fluid machine according to claim 2 , wherein the locating hole is provided radially outwardly of a sliding surface between the casing and the orbiting scroll.

4. The scroll fluid machine according to claim 2 , wherein a plurality of the locating holes are provided in each of the orbiting scroll and the casing.

5. The scroll fluid machine according to claim 2 , wherein the locating hole is provided in an end surface of the drive shaft.

6. A scroll fluid machine comprising:
a stationary scroll;
an orbiting scroll that is provided opposite to the stationary scroll;
a casing that is provided outside the orbiting scroll;
a drive shaft that makes the orbiting scroll orbit;
an orbiting bearing that transmits a rotational movement of the drive shaft to the orbiting scroll; and
a plurality of rotation prevention mechanisms that prevent rotation of the orbiting scroll, wherein:
the rotation prevention mechanism has a crankshaft and a crank bearing that supports the crankshaft; and a gap between the crankshaft and the crank bearing is made larger than a difference between amounts of eccentricity of the drive shaft and an orbiting radius of the crankshaft in accordance with the following formula:
|φ D 2 −φd 2 |/2>|ε 2 ′−ε 1 |

where |φD 2 −φd 2 |/2 denotes a gap between the crankshaft and the crank bearing,
ε 2 ′ denotes a distance from a center of a casing side-rotation prevention crank bearing to a center of an orbiting scroll side-rotation prevention crank bearing, and
ε 1 denotes an amount of eccentricity of the drive shaft to make the orbiting scroll orbit.

7. The scroll fluid machine according to claim 6 , wherein a locating hole that locates the orbiting scroll with respect to the casing is provided in each of the casing and the orbiting scroll.

8. The scroll fluid machine according to claim 7 , wherein the locating hole is provided radially outwardly of a sliding surface between the casing and the orbiting scroll.

9. The scroll fluid machine according to claim 7 , wherein a plurality of the locating holes are provided in each of the orbiting scroll and the casing.

10. The scroll fluid machine according to claim 7 , wherein the locating hole is provided in an end surface of the drive shaft.

Assignees

• Hitachi Industry Equipment Systems Co Ltd

Inventors

• Yamazaki Shumpei
• Kanemoto Yoshiyuki
• Kato Fuminori

Classifications

• F04C2270/17

  Tolerance; Play; Gap · CPC title

• F01C17/063 Primary

  with only rolling movement · CPC title

• F04C2240/50

  Bearings · CPC title

• F04C2240/30

  Casings or housings · CPC title

• F01C21/10

  Outer members for co-operation with rotary pistons; Casings (casings for rotary engines or machines in general F16M) · CPC title