Patent US3924515A successfully refreshed from Google Patents.
US3924515A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Porting arrangements of axial piston pumps and motors
Assignee: Individual
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Filing: 1973-06-15
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Granted: 1975-12-09
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Expires: 1993-06-15
Abstract
Abstract The invention provides an axial piston pump/motor in which working fluid is distributed to and from ports in a stationary port face through galleries and each gallery in the vicinity of the ports is divided into two separate galleries by radial hydrofoil-shaped center bodies which act to control fluid flow rate to approximately that of the circumferential speed of cylinder barrel ports passing the stationary ports.
Inventors
- 👤 Robert Cecil Clerk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:37
CPC Classifications
F; F01; F01B; F01B3/00; F01B3/0032; F01B3/0044; F01B3/0055
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
214 words
In an axial piston pump/motor including reciprocating pistons carried by a rotating cylinder block, a stationary port-face including inlet and outlet ports, each of said inlet and outlet ports having a leading edge and a trailing edge with respect to the direction of rotation of said rotating cylinder block, and a pair of port galleries communicating with said inlet ports and said outlet ports, respectively, whereby fluid entering said port gallery associated with said inlet port flows into said cylinder block as it passes said port-face during rotation, said galleries constructed in a manner such that fluid is directed from said leading edge of said inlet port towards said trailing edge of said inlet port, the improvement which comprises hydrofoil means mounted within said port galleries, so that during increased rotation of said cylinder block a portion of said fluid passing said trailing edge of said inlet port is recirculated around said hydrofoil means towards said leading edge of said inlet port, said hydrofoil means being mounted within said port galleries so that first and second recirculation paths are formed therein, said first recirculation paths being disposed between said hydrofoil means and said rotating cylinder block, and said second recirculation path being disposed between said hydrofoil means and the surface of said port galleries.
Claim 2
Dependent Claim
214 words
In an axial piston pump/motor including reciprocating pistons carried by a rotating cylinder block, a stationary port-face including inlet and outlet ports, each of said inlet and outlet ports having a leading edge and a trailing edge with respect to the direction of rotation of said rotating cylinder block, and a pair of port galleries communicating with said inlet ports and said outlet ports, respectively, whereby fluid entering said port gallery associated with said inlet port flows into said cylinder block as it passes said port-face during rotation, said galleries constructed in a manner such that fluid is directed from said leading edge of said inlet port towards said trailing edge of said inlet port, the improvement which comprises hydrofoil means mounted within said port galleries, so that during increased rotation of said cylinder block a portion of said fluid passing said trailing edge of said inlet port is recirculated around said hydrofoil means towards said leading edge of said inlet port, said hydrofoil means being mounted within said port galleries so that first and second recirculation paths are formed therein, said first recirculation paths being disposed between said hydrofoil means and said rotating cylinder block, and said second recirculation path being disposed between said hydrofoil means and the surface of said port galleries.
Claim 3
Dependent Claim
32 words
The axial piston pump/motor of claim 1 in which said inlet and outlet ports are kidney-shaped, and said port galleries substantially follow the circumferential curvature of said kidney-shaped inlet and outlet ports.
Claim 4
Dependent Claim
23 words
The axial piston pump/motor of claim 1 in which said hydrofoil means extend between the inner and outer walls of said port galleries.
Claim 5
Dependent Claim
45 words
The axial piston pump/motor of claim 1 in which said hydrofoil means includes slot means extending therethrough so that during reduced rotation of said cylinder block a portion of said fluid entering said port gallery associated with said inlet port passes through said slot means.
Claim 6
Dependent Claim
19 words
The axial piston pump/motor of claim 1 in which said hydrofoil means is coated with a low-friction plastics material.
Claim 7
Dependent Claim
184 words
In an axial piston pump/motor including axially reciprocating pistons carried by a rotating cylinder block, a stationary port-face including inlet and outlet ports, each of said inlet and outlet ports having a leading edge and a trailing edge with respect to the direction of rotation of said rotating cylinder block, and a pair of port galleries communicating with said inlet ports and said outlet ports, respectively, whereby fluid entering said port gallery associated with said inlet port flows into said cylinder block as it passes port-face rotation, said galleries constructed in a manner such that such fluid is directed from said leading edge of said inlet port towards said trailing edge of said inlet port, the improvement which comprises hydrofoil means mounted within said port galleries so that during increased rotation of said cylinder block portion of said fluid passing said trailing edge of said inlet port, said said hydrofoil means including slot means extending therethrough so that during reduced rotation of said cylinder block a portion of said fluid entering said port gallery associated with said inlet port passes through said slot means.
Claim 8
Dependent Claim
184 words
In an axial piston pump/motor including axially reciprocating pistons carried by a rotating cylinder block, a stationary port-face including inlet and outlet ports, each of said inlet and outlet ports having a leading edge and a trailing edge with respect to the direction of rotation of said rotating cylinder block, and a pair of port galleries communicating with said inlet ports and said outlet ports, respectively, whereby fluid entering said port gallery associated with said inlet port flows into said cylinder block as it passes port-face rotation, said galleries constructed in a manner such that such fluid is directed from said leading edge of said inlet port towards said trailing edge of said inlet port, the improvement which comprises hydrofoil means mounted within said port galleries so that during increased rotation of said cylinder block portion of said fluid passing said trailing edge of said inlet port, said said hydrofoil means including slot means extending therethrough so that during reduced rotation of said cylinder block a portion of said fluid entering said port gallery associated with said inlet port passes through said slot means.
Claim 9
Dependent Claim
19 words
The axial piston pump/motor of claim 6 in which said hydrofoil means is coated with a low-friction plastic material.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-08 | 1979-06-09 | 1979-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-08 | 1983-06-09 | 1983-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-08 | 1987-06-09 | 1987-12-09 | $7700.00 | Window Closed / Lapsed |