Scroll-Type Fluid Machine
Abstract
A scroll-type fluid machine in which: a fixed scroll and a moveable scroll are disposed in a housing; a fluid pocket, the volume of which varies, is formed between the fixed scroll and the moveable scroll; and a thrust plate for receiving the reaction force in the axial direction of pressure applied within the fluid pocket is disposed between the bottom plate of the moveable scroll and the housing. The scroll-type fluid machine is characterized in that at least the surface of the thrust plate facing the bottom plate of the moveable scroll is subjected to tin plating. As a consequence, it is possible to efficiently produce, at a low cost, a thrust bearing which is disposed between the bottom plate of the moveable scroll and the housing, exerts excellent seizure resistance, and has a high PV limit level and a low friction coefficient.
Claims
exact text as granted — not AI-modified1 . A scroll-type fluid machine in which a fixed scroll and a movable scroll to revolve around the fixed scroll as being prevented from rotating are provided to a housing, a fluid pocket having a variable volume is provided between the fixed scroll and the movable scroll, and a thrust plate to bear an axial reaction force of a pressure applied into the fluid pocket is provided between a bottom plate of the movable scroll and the housing, characterized in that at least a surface of the thrust plate facing the bottom plate of the movable scroll is plated with tin-based metal.
2 . The scroll-type fluid machine according to claim 1 , wherein the thrust plate is made of iron-based steel plate, cast metal or light metal.
3 . The scroll-type fluid machine according to claim 1 , wherein the thrust plate is provided with a base layer plated with the tin-based metal.
4 . The scroll-type fluid machine according to claim 3 , wherein the base layer is a nickel plating or a copper plating.
5 . The scroll-type fluid machine according to claim 1 , wherein the base layer plated with the tin-based metal on the thrust plate has a skewness Rsk defined by Formula 1 which is less or equal to −0.05 and a kurtosis Rku defined by Formula 2 which is more or equal to +2.5, wherein the skewness Rsk and the kurtosis Rku are prescribed in JISB0601 (corresponding to International Standard: ISO4287) concerning surface roughness.
Rsk
=
1
Rq
3
[
1
lr
∫
0
lr
Z
3
(
x
)
x
]
[
Formula
1
]
where, Z(x) is a function showing a profile and Rq is a root-mean-square height of the profile
(
1
l
∫
0
l
Z
2
(
x
)
x
)
.
Rku
=
1
Rq
4
[
1
lr
∫
0
lr
Z
4
(
x
)
x
]
[
Formula
2
]
where, Z(x) is a function showing a profile and Rq is a root-mean-square height of the profile
(
1
l
∫
0
l
Z
2
(
x
)
x
)
.
6 . The scroll-type fluid machine according to claim 1 , wherein the tin-based metal to be plated with has a thickness of 1-15 μm.
7 . The scroll-type fluid machine according to claim 1 , wherein a whole surface of the thrust plate is plated with the tin-based metal.
8 . The scroll-type fluid machine according to claim 1 , wherein the thrust plate is formed in a plurality of members divided circumferentially.Join the waitlist — get patent alerts
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