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US 6,443,707 B1Granted
Control valve for variable displacement compressor
AssigneeKabushiki Kaisha Toyoda Jidoshokki Seisakusho
InventorsKazuya Kimura, Hiroaki Kayukawa
Life of this patent
Estimating the term…
Abstract
A control valve for variable displacement compressor that prevents fluid fixation between a rod and a guide hole is provided. A first rod (89) extends through a first guide hole (88) to couple a bellows (87) to a valve body (74). A second rod (96) extends through a second guide hole (95) to couple a movable iron core (93) to the valve body (74). Tapered surfaces (89b, 96b) are formed on the outer surfaces of the first and second rods (89, 96). The space-between each tapered surface (89b 96b) and the inner surface (88a, 95a) of the corresponding guide hole (88, 95) is wider in the vicinity of a high pressure zone (73, 90) than in the vicinity of a low pressure zone (84, 91).
Claims23
A control valve for a variable displacement compressor comprising:
- a valve chamber;
- a valve body located in the valve chamber, wherein the valve body opens and closes a control passage, wherein the control passage connects a control pressure chamber with one of a suction pressure zone and a discharge pressure zone of the compressor, and the valve regulates the size of a portion of the control passage to vary the displacement of the compressor;
- an accommodation chamber, wherein the pressure in the accommodation chamber is different from the pressure in the valve chamber;
- a driving member located in the accommodation chamber, wherein the driving member applies force to the valve body to drive the valve body;
- a rod that moves axially to transmit the force from the driving member to the valve body;
- a dividing wall that divides the accommodation chamber from the valve chamber, wherein the dividing wall includes a defining surface that defines a guide hole through which the rod passes, and wherein the rod has an outer surface that faces the defining surface;
- and
- means for preventing fluid fixation caused between the outer surface and the defining surface due to the pressure difference between the valve chamber and the accommodation chamber, wherein the fluid fixation preventing means is located on at least one of the outer surface and the defining surface.
5 more elements
A control valve for a variable displacement compressor comprising:
- a valve chamber;
- a valve body located in the valve chamber, wherein the valve body opens and closes a control passage, wherein the control passage connects a control pressure chamber with one of a suction pressure zone and a discharge pressure zone of the compressor, and the valve regulates the size of a portion of the control passage to vary the displacement of the compressor;
- an accommodation chamber, wherein the pressure in the accommodation chamber is different from the pressure in the valve chamber;
- a driving member located in the accommodation chamber, wherein the driving member applies force to the valve body to drive the valve body;
- a rod that moves axially to transmit the force from the driving member to the valve body;
- a dividing wall that divides the accommodation chamber from the valve chamber, wherein the dividing wall includes a defining surface that defines a guide hole through which the rod passes, wherein the rod has an outer surface that faces the defining surface, wherein the dimensions of the guide hole and the rod are determined such that a seal is formed between the outer surface and the defining surface;
- and
- a space defined by the outer surface and the defining surface for preventing fluid fixation caused between the outer surface and the defining surface due to the pressure difference between the valve chamber and the accommodation chamber, wherein the space permits a gas that flows through an adjacent one of the valve chamber and the accommodation chamber to enter the guide hole and surround the rod to circumferentially equalize the pressure on the rod.
5 more elements
A control valve for a variable displacement compressor comprising:
- a valve chamber;
- a valve body located in the valve chamber, wherein the valve body opens and closes a control passage, wherein the control passage connects a control pressure chamber with one of a suction pressure zone and a discharge pressure zone of the compressor, and the valve regulates the size of a portion of the control passage to vary the displacement of the compressor;
- an accommodation chamber, wherein the pressure in the accommodation chamber is different from the pressure in the valve chamber;
- a driving member located in the accommodation chamber, wherein the driving member applies force to the valve body to drive the valve body;
- a rod that moves axially to transmit the force from the driving member to the valve body;
- and
- a dividing wall that divides the accommodation chamber from the valve chamber, wherein the dividing wall includes a defining surface that defines a guide hole through which the rod passes, and wherein the rod has an outer surface that faces the defining surface,
- wherein a space is formed between the outer surface and the defining surface, and the cross-sectional area of the space increases toward the one of the valve chamber and the accommodation chamber that has the highest pressure.
5 more elements
A control valve for a variable displacement compressor comprising:
- a valve chamber;
- a valve body located in the valve chamber, wherein the valve body opens and closes a control passage, wherein the control passage connects a control pressure chamber with one of a suction pressure zone and a discharge pressure zone of the compressor, and the valve regulates the size of a portion of the control passage to vary the displacement of the compressor;
- an accommodation chamber;
- a driving member located in the accommodation chamber, wherein the driving member applies force to the valve body to drive the valve body;
- a rod that moves axially to transmit the force from the driving member to the valve body;
- a dividing wall that divides the accommodation chamber from the valve chamber, wherein the dividing wall includes a defining surface that defines a guide hole through which the rod passes, and wherein the rod has an outer surface that faces the defining surface;
- and
- a plurality of tapered surfaces formed on at least one of the outer surface and the defining surface.
5 more elements
A control valve for a variable displacement compressor comprising:
- a valve chamber;
- a valve body located in the valve chamber, wherein the valve body opens and closes a control passage, wherein the control passage connects a control pressure chamber with one of a suction pressure zone and a discharge pressure zone of the compressor, and the valve regulates the size of a portion of the control passage to vary the displacement of the compressor;
- an accommodation chamber;
- a driving member located in the accommodation chamber, wherein the driving member applies force to the valve body to drive the valve body;
- a rod that moves axially to transmit the force from the driving member to the valve body;
- a dividing wall that divides the accommodation chamber from the valve chamber, wherein the dividing wall includes a defining surface that defines a guide hole through which the rod passes, and wherein the rod has an outer surface that faces the defining surface;
- and
- an annular groove formed in at least one of the outer surface and the defining surface.
5 more elements
Dependencies are inferred from the claim text.