US4037522A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vehicle air conditioning compressor
Assignee: Toyota Industries Corp
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Filing: 1975-09-23
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Granted: 1977-07-26
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Expires: 1995-09-23
Abstract
Abstract A vehicle air conditioning compressor which is driven by e.g., the prime mover of the vehicle as required to cool the passenger compartment comprises a swash plate mounted on a rotatable shaft and a plurality of pistons, each being reciprocated by the rotating swash plate via a set of a ball and a shoe rotatably engaging with each other, wherein said compressor is provided for each piston with a shoe composed of a steel backing plate having a sintered porous layer integrally formed thereon of a powdered copper alloy comprising 2.5 - 12.1 wt.% Sn, 7.0 - 25.0 wt.% Pb and the balance being substantially copper, in a critical thickness ranging from 0.1 mm to 0.5 mm.
Inventors
- 👤 Teruaki Inoshita
- 👤 Takashi Fukuda
- 👤 Hitoshi Toga
- 👤 Hikaru Takaoka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:40
CPC Classifications
F; F04; F04B; F04B27/00; F04B27/08; F04B27/10; F04B27/1036; F04B27/1054; F04B27/0873; F04B27/0878; F04B27/0886; F04B27/12; F16; F16C; F16C33/00; F16C33/02; F16C33/04; F16C33/06; F16C33/12; F05; F05C; F05C2201/00; F05C2201/04; F05C2201/0469; F05C2201/0475; F05C2201/0493; F05C2253/00; F05C2253/12; F16C2204/00; F16C2204/60; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12882; Y10T428/12903; Y10T428/12917
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
171 words
In a vehicle air conditioning compressor having a swash plate mounted on a rotatable shaft and a plurality of pistons, each of which is slidably engaged with the swash plate through intermediary of a set of a ball means and a shoe means rotatably engaging with one another and slidably reciprocates inside a cylinder bore of a common cylinder block in accordance with rotation of the swash plate, an improvement wherein: each said shoe comprises an imperforate ferrous backing plate as a major part thereof and a continuous, imperforate, sintered porous layer of a copper alloy, which is relatively thin with respect to said major part, formed integrally on said backing plate in slidable contact with said swash plate, said sintered layer having a thickness in the range of from 0.3 mm to 0.5 mm and consisting essentially of tin in a range of from 2.5 to 12.1 percent by weight and lead in a range of from 7.0 to 25.0 percent by weight with the balance by weight being copper.
Claim 2
Dependent Claim
171 words
In a vehicle air conditioning compressor having a swash plate mounted on a rotatable shaft and a plurality of pistons, each of which is slidably engaged with the swash plate through intermediary of a set of a ball means and a shoe means rotatably engaging with one another and slidably reciprocates inside a cylinder bore of a common cylinder block in accordance with rotation of the swash plate, an improvement wherein: each said shoe comprises an imperforate ferrous backing plate as a major part thereof and a continuous, imperforate, sintered porous layer of a copper alloy, which is relatively thin with respect to said major part, formed integrally on said backing plate in slidable contact with said swash plate, said sintered layer having a thickness in the range of from 0.3 mm to 0.5 mm and consisting essentially of tin in a range of from 2.5 to 12.1 percent by weight and lead in a range of from 7.0 to 25.0 percent by weight with the balance by weight being copper.
Claim 3
Dependent Claim
21 words
An improved vehicle air conditioning compressor in accordance with claim 1, wherein said ferrous backing plate is made from cast iron.
Claim 4
Dependent Claim
44 words
An improved vehicle air conditioning compressor in accordance with claim 2, wherein said layer of said copper alloy contains tin in a range of from 3.5 to 4.0 percent by weight and lead in a range of from 23.0 to 25.0 percent by weight.
References Cited (Backward Citations)
GB288947A
Cited
US2022917A
Cited
US2277496A
Cited
US3057545A
Cited
US3720507A
Cited
US3709107A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-25 | 1981-01-24 | 1981-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-25 | 1985-01-24 | 1985-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-25 | 1989-01-24 | 1989-07-26 | $7700.00 | Window Closed / Lapsed |