US4420986A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sliding shoe for a rotatable swash-plate type refrigerant gas compressor
Assignee: Toyota Industries Corp
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Filing: 1981-02-04
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Granted: 1983-12-20
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Expires: 2001-02-04
Abstract
Abstract Disclosed is a sliding shoe for a rotatable swash-plate type refrigerant gas compressor. This shoe is slidably connected between a rotatable swash-plate and a ball rotatably engaged with a piston. One of the major surfaces of the shoe slidably contacts a sliding surface of the swash-plate. A sliding surface of the shoe facing the swash-plate is formed with a flat plane at its center portion and chamfered surface at the remaining portion of the sliding surface. At least the sliding plane of the shoe is coated with a lead alloy. According to the present invention, even if the swash-plate type compressor has no lubrication, abrasion and seizing of the shoe can be reduced to a great extent.
Inventors
- 👤 Shozo Nakayama
- 👤 Kimio Kato
- 👤 Tusneo Sugiura
- 👤 Yoshio Kato
- 👤 Mikio Shugiura
- 👤 Keiichiro Otu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:22
CPC Classifications
F; F04; F04B; F04B27/00; F04B27/08; F04B27/0873; F04B27/0878; F04B27/0886; F16; F16H; F16H23/00; F16H23/10; F05; F05C; F05C2201/00; F05C2201/04; F05C2201/0469; F05C2201/0475; F05C2201/0493; F05C2253/00; F05C2253/12; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12701; Y10T74/00; Y10T74/18; Y10T74/18056; Y10T74/18296; Y10T74/18336
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
187 words
In a sliding shoe for a rotatable swash-plate type refrigerant gas compressor, in which said shoe is slidably connected between a swash-plate secured to a rotatable shaft at a predetermined inclined angle thereto and a ball rotatably engaged with a piston which effects compression of refrigerant gas by means of rotation to the swash-plate, the improvement wherein said shoe has a configuration substantially in the form of a circular disc having a swash-plate engaging surface with a major portion of said surface including a sliding plane for slidably engaging the sliding surface of the swash-plate, said shoe having a lubrication-enhancing surface slightly inclined with respect to the sliding plane within a predetermined distance from the outer periphery of the shoe, so that the cross section of the shoe, through a plane including the axis thereof, is chamfered in a substantially triangular shape having a predetermined angle between the lubrication-enhancing surface and the sliding plane, in such a way that the height H, the width L and the angle α of the chamfered portion are more than 5μ, from 0.5 to 2 mm and less than 10°, respectively.
Claim 2
Dependent Claim
187 words
In a sliding shoe for a rotatable swash-plate type refrigerant gas compressor, in which said shoe is slidably connected between a swash-plate secured to a rotatable shaft at a predetermined inclined angle thereto and a ball rotatably engaged with a piston which effects compression of refrigerant gas by means of rotation to the swash-plate, the improvement wherein said shoe has a configuration substantially in the form of a circular disc having a swash-plate engaging surface with a major portion of said surface including a sliding plane for slidably engaging the sliding surface of the swash-plate, said shoe having a lubrication-enhancing surface slightly inclined with respect to the sliding plane within a predetermined distance from the outer periphery of the shoe, so that the cross section of the shoe, through a plane including the axis thereof, is chamfered in a substantially triangular shape having a predetermined angle between the lubrication-enhancing surface and the sliding plane, in such a way that the height H, the width L and the angle α of the chamfered portion are more than 5μ, from 0.5 to 2 mm and less than 10°, respectively.
Claim 3
Dependent Claim
170 words
In a sliding shoe for a rotatable swash-plate type refrigerant gas compressor, in which said shoe is slidably connected between a swash-plate secured to a rotatable shaft at a predetermined inclined angle thereto and a ball rotatably engaged with a piston which effects compression of refrigerant gas by means of rotation of the swash-plate, the improvement wherein said shoe has a configuration substantially in the form of a circular disc having a swash-plate engaging surface with a major portion of said surface including a sliding plane for slidably engaging the sliding surface of the swash-plate, the outer periphery of the sliding plane of the shoe facing the swash-plate is chamfered and at least said sliding plane of the shoe is coated with a lead alloy, in such a way that the height H, the width L and the angle α of the chamfered portion are more than 5μ, from 0.5 to 2 mm and less than 10°, respectively, and the thickness of the lead alloy coating is 3 to 15μ.
Claim 4
Dependent Claim
170 words
In a sliding shoe for a rotatable swash-plate type refrigerant gas compressor, in which said shoe is slidably connected between a swash-plate secured to a rotatable shaft at a predetermined inclined angle thereto and a ball rotatably engaged with a piston which effects compression of refrigerant gas by means of rotation of the swash-plate, the improvement wherein said shoe has a configuration substantially in the form of a circular disc having a swash-plate engaging surface with a major portion of said surface including a sliding plane for slidably engaging the sliding surface of the swash-plate, the outer periphery of the sliding plane of the shoe facing the swash-plate is chamfered and at least said sliding plane of the shoe is coated with a lead alloy, in such a way that the height H, the width L and the angle α of the chamfered portion are more than 5μ, from 0.5 to 2 mm and less than 10°, respectively, and the thickness of the lead alloy coating is 3 to 15μ.
Claim 5
Dependent Claim
17 words
A sliding shoe according to claim 2, which includes a base plate comprising aluminum alloy and silicon.
Claim 6
Dependent Claim
22 words
A sliding shoe according to claim 2, which includes a base plate comprising copper alloyed with another metal comprising lead or tin.
Claim 7
Dependent Claim
29 words
A sliding shoe according to claim 2, which includes a base plate comprising copper alloy and a backing plate comprising steel alloy which is secured to the base plate.
Claim 8
Dependent Claim
15 words
A sliding shoe according to claim 5, wherein the copper alloy is formed by sintering.
Claim 9
Dependent Claim
16 words
A sliding shoe according to claim 2, wherein said lead alloy coating is applied by electroplating.
Claim 10
Dependent Claim
16 words
A sliding shoe according to claim 2, wherein the lead alloy coating is applied by deposition.
Claim 11
Dependent Claim
20 words
A sliding shoe according to claim 1, wherein said sliding plane is convex toward said sliding surface of the swash-plate.
Claim 12
Dependent Claim
20 words
A sliding shoe according to claim 2, wherein said sliding plane is convex toward said sliding surface of the swash-plate.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-12-19 | 1987-06-20 | 1987-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-19 | 1991-06-20 | 1991-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-19 | 1995-06-20 | 1995-12-20 | $7700.00 | Window Closed / Lapsed |