Patent US4178135A successfully refreshed from Google Patents.
US4178135A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable capacity compressor
Assignee: Bosch Corp
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Filing: 1977-12-16
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Granted: 1979-12-11
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Expires: 1997-12-16
Abstract
Abstract A controlled, variable displacement swash plate compressor is provided with means for controlling the capacity pivoting the swash plate about the drive shaft axis to vary the effective pumping capacity. The position of the swash plate with respect to the drive shaft axis is a function of the pressure maintained inside the crankcase, said position being a result of the various forces acting on the pistons, including the underside of the pistons where crankcase pressure is applied. A cam surface is provided to maintain a fixed top dead center position at all displacements, as well as an improved universal joint mechanism to anchor the swash plate against rotation.
Inventors
- 👤 Richard W. Roberts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:28
CPC Classifications
F; F04; F04B; F04B27/00; F04B27/08; F04B27/14; F04B27/16; F04B27/18; F04B27/1804; F04B27/10; F04B27/1036; F04B27/1054; F04B27/1072; F04B2027/1809; F04B2027/1813
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
154 words
A compressor comprising: means defining a plurality of gas working spaces each having a piston cooperating with suction and discharge ports to compress a compressible fluid therein; a drive shaft; a cam mechanism driven by said drive shaft; a swash plate driven by said cam mechanism in a nutating path about the drive shaft axis; means operably connected between said swash plate and the individual pistons to impart reciprocating drive to said pistons; means for supporting said swash plate and said cam mechanism for pivotal movement with respect to the axis of said drive shaft, the pivot point lying along said drive shaft axis; a cam follower associated with said cam mechanism, said cam follower including a roller, and an axially fixed cam surface cooperating with said roller, said roller engaging said axially fixed cam surface to shift the pivot point of said swash plate along said drive shaft axis to vary the stroke.
Claim 2
Dependent Claim
154 words
A compressor comprising: means defining a plurality of gas working spaces each having a piston cooperating with suction and discharge ports to compress a compressible fluid therein; a drive shaft; a cam mechanism driven by said drive shaft; a swash plate driven by said cam mechanism in a nutating path about the drive shaft axis; means operably connected between said swash plate and the individual pistons to impart reciprocating drive to said pistons; means for supporting said swash plate and said cam mechanism for pivotal movement with respect to the axis of said drive shaft, the pivot point lying along said drive shaft axis; a cam follower associated with said cam mechanism, said cam follower including a roller, and an axially fixed cam surface cooperating with said roller, said roller engaging said axially fixed cam surface to shift the pivot point of said swash plate along said drive shaft axis to vary the stroke.
Claim 3
Dependent Claim
20 words
A compressor as defined in claim 1 including resilient means biasing said swash plate in the direction of maximum stroke.
Claim 4
Dependent Claim
41 words
A compressor as defined in claim 1 including a closed crankcase, the fluid pressure established in said crankcase being applied the underside of each said piston in opposition to the reaction pressure of gas being compressed in said gas working spaces.
Claim 5
Dependent Claim
53 words
A compressor as defined in claim 1 wherein said drive shaft is provided with an axial extending bore and a pair of opposed, elongated openings; a slider received in said bore; a cross-pin extending through said slider and said opposed openings, said cam mechanism being pivotally supported by the ends of said cross-pin.
Claim 6
Dependent Claim
20 words
A compressor as defined in claim 1 including resilient means urging said cam follower into contact with said cam surface.
Claim 7
Dependent Claim
26 words
A compressor as defined in claim 5 wherein said cam surface is contoured to maintain a fixed top-dead-center position of said pistons irrespective of stroke length.
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) | 1982-12-10 | 1983-06-11 | 1983-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-10 | 1987-06-11 | 1987-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-10 | 1991-06-11 | 1991-12-11 | $7700.00 | Window Closed / Lapsed |