Expansible chamber devices – Relatively movable working members – Interconnected with common rotatable shaft
Reexamination Certificate
2000-02-02
2001-07-10
Lopez, F. Daniel (Department: 3745)
Expansible chamber devices
Relatively movable working members
Interconnected with common rotatable shaft
C092S187000, C029S888042, C029S888051, C072S054000
Reexamination Certificate
active
06257121
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a piston with a piston rod for high pressures, particularly a swash plate compressor, which has several circumferentially juxtaposed pistons, which are connected to rods, whose two ends are pivotably mounted by spherical rod heads on the one hand on the piston and on the other on the swash plate in ball receptacles.
DE-A-4024319 discloses a piston of a hydraulic swash plate mechanism, in which a substantially spherical rod head has a bevelled portion, which allows a fitting into a correspondingly shaped ball receptacle, if the rod is in a position outside its normal pivoting range.
The problem of the invention is to find a piston of the aforementioned type, which can absorb particularly high forces and is easy to manufacture.
SUMMARY OF THE INVENTION
According to the invention this problem is solved by a piston of the aforementioned type, wherein the piston is provided between the front and rear piston area with an uninterrupted, circumferential indentation, which inwardly forms an undercut enclosing the spherical rod head.
According to the invention this problem is also solved in that the ball receptacle is hemispherical and in the direction of the rear piston area is bounded by a soft elastic sealing ring sealingly surrounding the spherical piston rod, so that the piston rod is held in the ball receptacle by the gas pressure acting on the rear area of the piston.
In additions a method and a die for producing the piston provided with an indentation are proposed.
REFERENCES:
patent: 4480964 (1984-11-01), Skinner
patent: 4784045 (1988-11-01), Terauchi
patent: 4836090 (1989-06-01), Smith
patent: 5205718 (1993-04-01), Fujisawa et al.
patent: 2438444 (1975-02-01), None
patent: 4024319 (1991-02-01), None
patent: 1380356 (1975-01-01), None
patent: 252878 (1986-11-01), None
Kuhn Peter
Obrist Frank
Audi Aktiengesellschaft
Ladas & Parry
Lopez F. Daniel
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