Displacement control valve of variable displacement compressor, compressors including such valves, and methods for manufacturing such compressors

A variable displacement compressor comprising a displacement control valve, wherein the displacement of said compressor is varied by closing or opening a control path between a discharge chamber or a suction chamber and a crank chamber, said valve comprising:

• a valve body for closing or opening said control path;
• a control rod;
• and
• a rod passage receiving said control rod, wherein a first end of said control rod is affixed to said valve body and said control rod extends from said valve body to means for urging said valve body to close or open said control path,
• wherein said control rod is tapered, such that a first cross-sectional area of said control rod proximate to said valve body is greater than a second cross-sectional area of said control rod proximate to said means for urging said valve body to close or open said control path.

A displacement control valve for use in a variable displacement compressor, wherein the displacement of said compressor is varied by closing or opening a control path between a discharge chamber or a suction chamber and a crank chamber, said valve comprising:

• a valve body for closing or opening said control path;
• a control rod;
• and
• a rod passage receiving said control rod, wherein a first end of said control rod is affixed to said valve body and said control rod extends from said valve body to means for urging said valve body to close or open said control path,
• wherein said rod is tapered, such that a gap formed between said rod and said rod passage increases in size proximate to said means for urging said valve body.

A variable displacement compressor comprising a displacement control valve, wherein the displacement of said compressor is varied by closing or opening a control path between a discharge chamber or a suction chamber and a crank chamber, said valve comprising:

• a valve body for closing or opening said control path;
• a control rod;
• and
• a rod passage receiving said control rod, wherein a first end of said control rod is affixed to said valve body and said control rod extends from said valve body to means for urging said valve body to close or open said control path,
• wherein said rod is tapered, such that a gap formed between said rod and said rod passage increases in size proximate to said means for urging said valve body.

A displacement control valve for use in a variable displacement compressor, wherein the displacement of said compressor is varied by closing or opening a control path between a discharge chamber or a suction chamber and a crank chamber, said valve comprising:

• a valve body for closing or opening said control path;
• a control rod;
• and
• a rod passage receiving said control rod, wherein a first end of said control rod is affixed to said valve body and said control rod extends from said valve body to means for urging said valve body to close or open said control path,
• wherein a spiral groove is formed about, within, and over at least a portion of a peripheral surface of at least one of said rod and of said rod passage.

A variable displacement compressor comprising a displacement control valve, wherein the displacement of said compressor is varied by closing or opening a control path between a discharge chamber or a suction chamber and a crank chamber, said valve comprising:

• a valve body for closing or opening said control path;
• a control rod;
• and
• a rod passage receiving said control rod, wherein a first end of said control rod is affixed to said valve body and said control rod extends from said valve body to means for urging said valve body to close or open said control path,
• wherein a spiral groove is formed about, within, and over at least a portion of a peripheral surface of at least one of said rod and of said rod passage.

A variable displacement compressor comprising a displacement control valve, wherein the displacement of said compressor is varied by closing or opening a control path between a discharge chamber or a suction chamber and a crank chamber, said valve comprising:

• a valve body for closing or opening said control path;
• a control rod;
• and
• a rod passage receiving said control rod, wherein a first end of said control rod is affixed to said valve body and said control rod extends from said valve body to means for urging said valve body to close or open said control path,
• wherein a spiral groove is formed about, within, and over at least a portion of a peripheral surface of said rod.