US3866518A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid pressure device of the axial plunger type
Assignee: Aisin Corp
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Filing: 1972-12-27
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Granted: 1975-02-18
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Expires: 1992-12-27
Abstract
Abstract A fluid pressure device of the axial plunger type including a housing, a rotatable shaft within the housing, a rotatable cylinder block operatively connected to the shaft and having a plurality of axial bores, plungers slidably mounted, respectively, within the bores, a valve plate located in abutment with an end surface of the cylinder block and having inlet and outlet ports which communicate successively with the bores as the cylinder block rotates, a swash plate pivotally supported upon the housing and operatively connected to the plungers for causing the plungers to reciprocate, and plunger shoes positioned between the plungers and the swash plate, the shoes being made of either a high tensile aluminum alloy, titanium, or a high tensile titanium alloy and comprising a slidable bearing surface made of a high load-bearing alloy which is adapted to bear against a planar surface of the swash plate.
Inventors
- 👤 Takayuki Miyao
- 👤 Hiroaki Maeda
- 👤 Masanori Sato
- 👤 Hiroshi Motoyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:26
CPC Classifications
F; F04; F04B; F04B1/00; F04B1/12; F04B1/122; F04B1/124; F05; F05C; F05C2201/00; F05C2201/04; F05C2201/0469; F05C2201/0475; F05C2201/90; F05C2201/906; F05C2253/00; F05C2253/12
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
185 words
A fluid pressure device of the axial plunger type comprising: a housing; a rotatable shaft within said housing; a rotatable cylinder block operatively connected to said shaft and provided with a plurality of longitudinal cylindrical bores therein; plungers slidably mounted, respectively, within said bores and including spherical outer end portions; a valve plate located in abutment with an end surface of said cylinder block and having a pair of ports which communicate successively with said bores as said cylinder block rotates; a swash plate pivotally supported upon said housing and having a slidable planar surface; and a plurality of plunger shoes associated with said spherical outer end portions of said plungers at spherical socket portions thereof and including slidable bearing surfaces adapted for engaging said slidable planar surface of said swash plate for causing said plungers to reciprocate, said shoes being formed of a light weight high tensile metal material and said slidable bearing surfaces of said shoes being formed of a high load-bearing alloy, wherein said high-load bearing alloy is applied to said slidable bearing surfaces of said shoe as a powder metallurgy material.
Claim 2
Dependent Claim
185 words
A fluid pressure device of the axial plunger type comprising: a housing; a rotatable shaft within said housing; a rotatable cylinder block operatively connected to said shaft and provided with a plurality of longitudinal cylindrical bores therein; plungers slidably mounted, respectively, within said bores and including spherical outer end portions; a valve plate located in abutment with an end surface of said cylinder block and having a pair of ports which communicate successively with said bores as said cylinder block rotates; a swash plate pivotally supported upon said housing and having a slidable planar surface; and a plurality of plunger shoes associated with said spherical outer end portions of said plungers at spherical socket portions thereof and including slidable bearing surfaces adapted for engaging said slidable planar surface of said swash plate for causing said plungers to reciprocate, said shoes being formed of a light weight high tensile metal material and said slidable bearing surfaces of said shoes being formed of a high load-bearing alloy, wherein said high-load bearing alloy is applied to said slidable bearing surfaces of said shoe as a powder metallurgy material.
Claim 3
Dependent Claim
169 words
A fluid pressure device of tHe axial plunger type comprising: a housing; a rotatable shaft within said housing; a rotatable cylinder block operatively connected to said shaft and provided with a plurality of longitudinal cylindrical bores therein; plungers slidably mounted respectively, within said bores and including spherical outer end portions; a valve plate located in abutment with an end surface of said cylinder block and having a pair of ports which communicate successively with said bores as said cylinder block rotates; a swash plate pivotally supported upon said housing and having a slidable planar surface; and a plurality of plunger shoes associated with said spherical outer end portions of said plungers at spherical socket portions thereof and including slidable bearing surfaces adapted for engaging said slidable planar surface of said swash plate for causing said plungers to reciprocate, said shoes being formed of a light weight high tensile metal material and said slidable bearing surfaces of said shoes being formed of a high load-bearing alloy of aluminum and silicon.
Claim 4
Dependent Claim
169 words
A fluid pressure device of tHe axial plunger type comprising: a housing; a rotatable shaft within said housing; a rotatable cylinder block operatively connected to said shaft and provided with a plurality of longitudinal cylindrical bores therein; plungers slidably mounted respectively, within said bores and including spherical outer end portions; a valve plate located in abutment with an end surface of said cylinder block and having a pair of ports which communicate successively with said bores as said cylinder block rotates; a swash plate pivotally supported upon said housing and having a slidable planar surface; and a plurality of plunger shoes associated with said spherical outer end portions of said plungers at spherical socket portions thereof and including slidable bearing surfaces adapted for engaging said slidable planar surface of said swash plate for causing said plungers to reciprocate, said shoes being formed of a light weight high tensile metal material and said slidable bearing surfaces of said shoes being formed of a high load-bearing alloy of aluminum and silicon.
Claim 5
Dependent Claim
31 words
A device as set forth in claim 2, wherein said alloy of aluminum and silicon contains respective amounts of aluminum and silicon in the approximate porportion of 92- 96: 4- 8.
Claim 6
Dependent Claim
30 words
A device as set forth in claim 2, where said slidable bearing surfaces of said shoes are made either of a copper alloy or a copper alloy of sintered material.
Claim 7
Dependent Claim
20 words
A device as set forth in claim 4, wherein said copper alloy is either phosphor bronze or high-lead phosphor bronze.
Claim 8
Dependent Claim
27 words
A device as set forth in claim 5, wherein a layer of molybdenum is provided between said copper alloy and said light weight high tensile metal material.
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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) | 1978-02-17 | 1978-08-19 | 1979-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-17 | 1982-08-19 | 1983-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-17 | 1986-08-19 | 1987-02-18 | $7700.00 | Window Closed / Lapsed |