Patent US4331064A successfully refreshed from Google Patents.
US4331064A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressurized fluid mechanism such as a hydraulic engine
Assignee: Poclain Hydraulics France SA
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Filing: 1980-02-04
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Granted: 1982-05-25
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Expires: 2000-02-04
Abstract
Abstract The invention relates to a hydraulic engine with radial pistons, comprising girders which transmit the thrusts of the pistons and rest against strips secured to the cylinder block. The surface of the cylinder block has a degree of roughness at least equal to the following values given in reference to the currently applied norms 0.25 μRA; 15 μRt; and 8 μRp. The invention finds its application in the production of a reliable engine.
Inventors
- 👤 Jean-Francois Cheylus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:36
CPC Classifications
F; F03; F03C; F03C1/00; F03C1/02; F03C1/04; F03C1/0403; F03C1/0415; F03C1/0428; F03C1/22; F03C1/24; F03C1/2407
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
158 words
A pressurized hydraulic fluid mechanism comprising: a cam; a cylinder block mounted for rotation with respect to the said cam about a rotation axis and including at least one cylinder in said cylinder block; at least one piston mounted for axial sliding in said cylinder; a girder operatively coupling said piston to said cam, said girder slidably mounted inside a radial cut formed in said cylinder block, the walls of said cut forming an extension of said cylinder; said girder positioned adjacent to said walls parallel to the axis of said cylinder; a removable strip interposed between each wall of the cut and the portion of girder facing it, said strips each fixed on one said wall of the cylinder block or on said girder, the surface of at least one of said wall on which is fixed said strip or the face of said strip which faces said wall having a degree of roughness of at least
Claim 2
Dependent Claim
158 words
A pressurized hydraulic fluid mechanism comprising: a cam; a cylinder block mounted for rotation with respect to the said cam about a rotation axis and including at least one cylinder in said cylinder block; at least one piston mounted for axial sliding in said cylinder; a girder operatively coupling said piston to said cam, said girder slidably mounted inside a radial cut formed in said cylinder block, the walls of said cut forming an extension of said cylinder; said girder positioned adjacent to said walls parallel to the axis of said cylinder; a removable strip interposed between each wall of the cut and the portion of girder facing it, said strips each fixed on one said wall of the cylinder block or on said girder, the surface of at least one of said wall on which is fixed said strip or the face of said strip which faces said wall having a degree of roughness of at least
Claim 3
Dependent Claim
6 words
25 μRa 15 μRt 8 μRp.
Claim 4
Dependent Claim
6 words
25 μRa 15 μRt 8 μRp.
Claim 5
Dependent Claim
28 words
A mechanism as claimed in claim 1, wherein said roughness is at least equal to 0.32 μRa, between 20 and 30 μRt, and between 10 and 15 μRp.
Claim 6
Dependent Claim
59 words
A mechanism as claimed in claim 1 or 2, wherein each strip includes two lugs extending substantially perpendicularly to the plane of said strip and cooperating with two housings provided in the one of said walls or said girder on which is fixed each said strips to secure said strip on the one of said walls or said girder.
Claim 7
Dependent Claim
33 words
A mechanism as claimed in claim 3, wherein each of said strips are fixed on said wall of said cylinder block; said housings comprise circular grooves provided in the faces of said strips.
Claim 8
Dependent Claim
17 words
A mechanism as claimed in claim 4, wherein said grooves are co-axial to the axis of rotation.
Claim 9
Dependent Claim
17 words
A mechanism as claimed in claim 5, wherein said strips have an outer surface made of bronze.
References Cited (Backward Citations)
FR500365A
Cited
US1916978A
Cited
US2324291A
Cited
FR976857A
Cited
US3659504A
Cited
US3839946A
Cited
US3808659A
Cited
FR2354459B1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-05-24 | 1985-11-23 | 1986-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-24 | 1989-11-23 | 1990-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-24 | 1993-11-23 | 1994-05-25 | $7700.00 | Window Closed / Lapsed |