US3922932A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crenellation drum; and epicyclic transmission incorporating the same
Assignee: Renault SA
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Filing: 1973-11-21
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Granted: 1975-12-02
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Expires: 1993-11-21
Abstract
Abstract An epicyclic transmission comprising brakes and/or clutches in which a crenellated drum has a reaction element mounted thereon and held against axial sliding in at least one direction by abutment members upset from grooves of the crenellated drum adjacent smaller apertures the upset portions each having a profile of a double curvature extending between the associated aperture and the point of merging with the remainder of the crenellated drum, when viewed in cross-section on an axial plane.
Inventors
- 👤 Jean Maurice
- 👤 Andre Mouttet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:50
CPC Classifications
F; F16; F16H; F16H57/00; F16H57/08; F16D; F16D13/00; F16D13/22; F16D13/38; F16D13/52; F16D13/58; F16D13/60; F16D13/64; F16D13/68; F16D13/683; F16D25/00; F16D25/06; F16D25/062; F16D25/063; F16D25/0635; F16D25/0638; F16H3/00; F16H3/44; F16H3/62; F16H3/66; F16H2200/00; F16H2200/003; F16H2200/0039; F16H2200/20; F16H2200/2002; F16H2200/2007; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/1987; Y10T74/19893; Y10T74/19935
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
247 words
An epicyclic transmission including a ring gear having a toothed inner face and a splined outer face, a sun gear coaxially within said ring gear; a plurality of planet gears in nesting contact with and between said sun gear and said ring gear; a crenellated drum whose crenellations define grooves to receive the splined outer face of said ring gear; two sets of abutment members formed on said crenellated drum, each set of abutment members being arranged on a respective plane transverse to the drum axis and the abutment member of the sets being oppositely disposed, abutment faces of said ring gear arranged in respective abutment planes transverse to the axis of said ring gear for abutment with the abutment faces of said abutment members; and apertures in said grooves of the crenellated drum adjacent said abutment members, said abutment members each comprising an upset portion of a groove of said crenellated drum, said upset portion having a profile when viewed as a cross-section on an axial plane of the drum which extends continuously from said aperture through a first zone of a given curvature and then a second zone of a reversely directed curvature to merge with the groove of the crenellated drum, said aperture having a smaller extent than the upset portion when viewed as a development of the drum, and the abutment edge being at the edge of said abutment member closest to said aperture and shaped to lie in the respective abutment plane.
Claim 2
Dependent Claim
247 words
An epicyclic transmission including a ring gear having a toothed inner face and a splined outer face, a sun gear coaxially within said ring gear; a plurality of planet gears in nesting contact with and between said sun gear and said ring gear; a crenellated drum whose crenellations define grooves to receive the splined outer face of said ring gear; two sets of abutment members formed on said crenellated drum, each set of abutment members being arranged on a respective plane transverse to the drum axis and the abutment member of the sets being oppositely disposed, abutment faces of said ring gear arranged in respective abutment planes transverse to the axis of said ring gear for abutment with the abutment faces of said abutment members; and apertures in said grooves of the crenellated drum adjacent said abutment members, said abutment members each comprising an upset portion of a groove of said crenellated drum, said upset portion having a profile when viewed as a cross-section on an axial plane of the drum which extends continuously from said aperture through a first zone of a given curvature and then a second zone of a reversely directed curvature to merge with the groove of the crenellated drum, said aperture having a smaller extent than the upset portion when viewed as a development of the drum, and the abutment edge being at the edge of said abutment member closest to said aperture and shaped to lie in the respective abutment plane.
Claim 3
Dependent Claim
58 words
A transmission as set forth in claim 1, wherein said upset wall portion forming each abutment member has, when vieWed in cross-section on a plane perpendicular to the axis of the drum, a profile of V configuration, said V having arms which are connected by their ends to the general profile of the groove of the crenellated drum.
Claim 4
Dependent Claim
65 words
A transmission as set forth in claim 1, wherein said upset wall portion forming each abutment member has, when viewed in cross-section on a plane perpendicular to the axis of the drum, a profile of U configuration, said U having arms which are connected by their ends to the general profile of the groove of the crenellated drum prior to formation of the abutment member.
Claim 5
Dependent Claim
31 words
A transmission as set forth in claim 1, wherein the crenellations of the drum include grooves of unequal width, and said abutment members are shaped on the grooves of greater width.
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) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |