§
Luxuse
Patent Intelligence
Sign In
Patent US3853436A successfully refreshed from Google Patents.
← Back to Patent Explorer
US3853436A Expired / Lapsed US ⏱️ 0.0 years remaining

Rotary piston machine with internal splined shaft

Assignee: Danfoss AS
•
Filing: 1973-05-31
•
Granted: 1974-12-10
•
Expires: 1993-05-31
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract The invention relates to a gerotor type rotary piston machine. The casing has a main axis and the gerotor gear set includes an externally toothed star member which is rotatable about its own axis and orbital about the casing main axis. A main drive shaft is rotatable about the casing axis and a universal type wobble shaft connects the main shaft to the gerotor star member. An annularly shaped valve is mounted in said casing for rotation about the casing main axis. The valve is in surrounding relation to the wobble shaft and is axially positioned between the two ends of the wobble shaft. The wobble shaft has a cross bore and a diametrically extending drive member attached to the valve extending through the cross bore. The wobble shaft has a longitudinally extending bore and a keying shaft having a stem in this bore engages the valve drive member in driving relation thereto. The keying member is needed because the wobble shaft has a compound rotating and orbiting motion whereas the valve only has a rotating motion and something more than a simple shaft and bore connection between them is required.

Inventors

  • 👤 C Ohrberg

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-08 21:43
CPC Classifications
F; F04; F04C; F04C15/00; F04C15/0057; F04C15/0061; F04C2/00; F04C2/08; F04C2/10; F04C2/103; F04C2/104

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 184 words
A gerotor type rotary piston machine comprising a casing having a main axis, a gerotor gear set having an externally toothed wheel which is rotatable about its own axis and orbitable about said main axis, said wheel being internally splined, an internally splined main shaft rotatable about said axis, a wobble shaft having externally splined front and rear heads at opposite ends thereof in respective splined engagement with said wheel and said main shaft, an annularly shaped valve mounted in said casing for rotation about said main axis, said valve being in surrounding relation to said main shaft and said wobble shaft between the opposite ends thereof, said main shaft and said wobble shaft having aligned and transversely extending cross bores, a diametrically extending drive member attached to said valve and extending through said main and wobble shaft bores, said wobble shaft having a longitudinal bore extending from said cross bore thereof to and through said front head of said wobble shaft, and drive connection means including a keying shaft having a stem mounted in said wobble longitudinal bore which engages said drive member.
Claim 2
Dependent Claim 184 words
A gerotor type rotary piston machine comprising a casing having a main axis, a gerotor gear set having an externally toothed wheel which is rotatable about its own axis and orbitable about said main axis, said wheel being internally splined, an internally splined main shaft rotatable about said axis, a wobble shaft having externally splined front and rear heads at opposite ends thereof in respective splined engagement with said wheel and said main shaft, an annularly shaped valve mounted in said casing for rotation about said main axis, said valve being in surrounding relation to said main shaft and said wobble shaft between the opposite ends thereof, said main shaft and said wobble shaft having aligned and transversely extending cross bores, a diametrically extending drive member attached to said valve and extending through said main and wobble shaft bores, said wobble shaft having a longitudinal bore extending from said cross bore thereof to and through said front head of said wobble shaft, and drive connection means including a keying shaft having a stem mounted in said wobble longitudinal bore which engages said drive member.
Claim 3
Dependent Claim 50 words
A rotary piston machine according to claim 1 wherein the end of said stem is bifurcated and straddles said drive member, said keying shaft having a head portion at the end thereof opposite from said drive member, and a casing portion having abutting engagement with said keying shaft head portion.
Claim 4
Dependent Claim 16 words
A rotary piston machine according to claim 1 wherein said drive member has a rectangular cross-section.
Claim 5
Dependent Claim 17 words
A rotary piston machine according to claim 1 wherein said drive member has a circular cross section.
Claim 6
Dependent Claim 17 words
A rotary piston machine according to claim 1 wherein said drive member has two parallel shaft portions.
Claim 7
Dependent Claim 16 words
A rotary piston machine according to claim 5 wherein said parallel shaft portions have circular cross-sections.

References Cited (Backward Citations)

US3500756A Cited
US3584985A Cited
US3552892A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1977-12-09 1978-06-10 1978-12-10 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1981-12-09 1982-06-10 1982-12-10 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1985-12-09 1986-06-10 1986-12-10 $7700.00 Window Closed / Lapsed

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag