Pumps – Three or more cylinders arranged in parallel – radial – or...
Reexamination Certificate
2000-04-04
2001-12-04
Freay, Charles G. (Department: 3746)
Pumps
Three or more cylinders arranged in parallel, radial, or...
C092S071000, C092S1650PR
Reexamination Certificate
active
06325599
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to air conditioning systems for vehicles and, more specifically, to a piston having anti-rotation for a swashplate compressor of an air conditioning system in a motor vehicle.
2. Description of the Related Art
It is known to provide an air conditioning system for a motor vehicle. The air conditioning system typically carries a fluid medium such as a refrigerant to cool air for an occupant compartment of the motor vehicle. It is also known to provide a compressor for the air conditioning system to compress the refrigerant circulating therethrough. One type of compressor for an air conditioning system is known as a swashplate compressor. An example of such a compressor for an air conditioning system is disclosed in U.S. Pat. No. 5,720,215. In this patent, the compressor has a housing with a cylindrical inner surface surrounding a cylinder block having a series of cylinder bores. A central drive shaft rotates a slanted swashplate that moves axially in a reciprocating manner to drive corresponding pistons connected thereto in their cylinder bores. Unlike wobble plate driven pistons, there is a need to limit the rotation of the pistons in a swashplate compressor. The swashplate compressor has anti-rotation wings that prevent the piston from rubbing with the swashplate. However, the limiting housing dimension is dependent on the swashplate mechanism in the crankcase.
It is desirable to provide a piston for a swashplate compressor of an air conditioning system with an anti-rotation feature. It is also desirable to provide a piston for a swashplate compressor of an air conditioning system that allows for much tighter packaging of the compressor. It is further desirable to provide anti-rotation wings for the pistons in a swashplate compressor to limit rotation of the pistons. Therefore, there is a need in the art to provide a piston having anti-rotation for a swashplate compressor of an air conditioning system that accomplishes these desires.
SUMMARY OF THE INVENTION
Accordingly, the present invention is a piston having anti-rotation for a swashplate compressor including a body portion extending axially and a connecting portion spaced radially from a longitudinal axis of the body portion and extending axially. The piston also includes a pair of opposed anti-rotation wings extending radially from one end of the body portion between the connecting portion and the longitudinal axis of the body portion.
One advantage of the present invention is that a piston having anti-rotation is provided for a swashplate compressor of an air conditioning system of a vehicle. Another advantage of the present invention is that the piston has anti-rotation wings moved closer to a centerline of the piston, enabling the anti-rotation feature of the swashplate compressor to be maintained within a tighter packaging space.
Other features and advantages of the present invention will be readily appreciated, as the same becomes better understood after reading the subsequent description taken in conjunction with the accompanying drawings.
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Harte Shane A.
Herder David
Huang Yong
Sud Lavlesh
Freay Charles G.
Shelton Larry I.
Solak Timothy P.
Visteon Global Technologies Inc.
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