Pumps – Condition responsive control of drive transmission or pump... – Adjustable cam or linkage
Reexamination Certificate
1999-10-07
2001-05-08
Thorpe, Timothy S. (Department: 3746)
Pumps
Condition responsive control of drive transmission or pump...
Adjustable cam or linkage
C417S269000
Reexamination Certificate
active
06227811
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a variable capacity swash plate type compressor adapted for use in an air conditioner for a vehicle, and more particularly, to a piston suitable for use in an automotive air conditioning compressor in which the piston includes an associated swash plate to minimize the bending moment exerted thereon.
Generally, a piston type compressor for use in an automotive air conditioning system comprises a cylinder block having a plurality of cylinder bores. A plurality of pistons are slidably disposed in the respective cylinder bores and reciprocate by, for example, a swash plate in the cylinder bores. In a variable capacity swash plate type compressor with a mechanism varying an inclination angle of the swash plate, a single-headed piston is generally used. The single-headed piston includes a body with a head, and support portion for receiving shoes which convert rotation of the swash plate into reciprocation of the pistons. However, a bending moment acts on the pistons due to force exerted deflectively on the pistons during operation of the compressor. Accordingly, the bending moment causes the deformation of pistons, and thus, a contact portion between the pistons and the cylinder bores is abraded deflectively.
SUMMARY OF THE INVENTION
It is an object of the invention to provide a swash plate type compressor with pistons by which the problems of the prior art can be solved.
Another object of the invention is to provide a swash plate type compressor provided with a piston having a construction to minimize a bending moment by which high durability of the piston and compressor can be accomplished.
Still another object of the invention is to provide a swash plate type compressor provided with a mechanism suitable for a piston having a construction to minimize a bending moment.
The above as well as other objects of the invention may be typically achieved by producing a variable capacity swash plate type compressor comprising:
a cylinder block having a plurality of cylinder bores arranged radially and circumferentially therein;
a housing mounted adjacent the cylinder block and cooperating with the cylinder block to define an air-tight sealed crank chamber;
a drive shaft rotatably supported by the housing and the cylinder block;
a rotor mounted on the drive shaft;
a swash plate connected to the rotor and slidably mounted on the drive shaft to thereby change an inclination angle thereof in response to the changes of pressure in the crank chamber;
a hinge means disposed between the rotor and the swash plate for changing the inclination angle of the swash plate;
a plurality of pistons reciprocatively disposed in each of the cylinder bores, each piston having a cylindrical body with a head, and a bridge portion connected to the body and having a recess and a pair of shoe pockets formed in opposed walls defining the recess, the body of each piston having a lower back edge portion extending to a place between an entrance and an apex of the shoe pocket adjacent to the body, the lower back edge portion being around a portion connected to the bridge portion, whereby contact between the swash plate and the lower back edge portion of the pistons is prevented;
a plurality of shoes disposed in the shoe pockets of the recess of each piston to come into contact with the swash plate for converting rotation of the swash plate into reciprocation of the pistons; and
a control valve means for adjusting a pressure level in the crank chamber.
REFERENCES:
patent: 5336056 (1994-08-01), Kimura et al.
patent: 5382139 (1995-01-01), Kawaguchi et al.
patent: 5387091 (1995-02-01), Kawaguchi et al.
patent: 5540559 (1996-07-01), Kimura et al.
patent: 5644968 (1997-07-01), Kimura et al.
patent: 5897298 (1999-04-01), Umemura
Gray Michael K.
Shelton Larry I.
Thorpe Timothy S.
Visteon Global Technologies Inc.
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