Control valve in variable displacement compressor and method of manufacture
AssigneeKabushiki Kaisha Toyoda Jidoshokki Seisakusho
InventorsMasahiro Kawaguchi, Ken Suitou, Masakazu Murase, Hiroshi Kubo
Life of this patent
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Abstract
A control valve for a variable displacement compressor. The control valve has a valve body for regulating gas flow. A bellows actuates the valve body through a first rod in accordance with an operating pressure introduced to a pressure sensing chamber. A solenoid biases the valve body through a second rod with a force based on the level or an electric current supplied to the solenoid. The cross-sectional area of the second rod is no smaller than the cross-sectional area of a valve hole of the control valve.
Claims22
A control valve for adjusting the amount of gas flowing in a gas passage in accordance with an operating pressure applied to the control valve, the control valve comprising:
- a housing, the housing including a valve hole and a valve chamber located in the gas passage, wherein the valve hole communicates with the valve chamber;
- a movable valve body located in the valve chamber in close proximity to the valve hole, wherein the valve body restricts the valve hole;
- a reacting member for reacting to the operating pressure;
- a first rod located between the reacting member and the valve body to transmit the reaction of the reacting member to the valve body;
- a solenoid located on the opposite side of the valve body from the reacting member, the solenoid including a plunger chamber and a plunger movably accommodated in the plunger chamber, wherein a certain level of electric current is applied to the solenoid;
- and
- a second rod located between the plunger and the valve body and located on the opposite side of the valve body from the valve hole, wherein the plunger applies a force to the valve body through the second rod, wherein the force applied by the plunger is based on the level of electric current supplied to the solenoid, and wherein a design cross-sectional area of the second rod is larger than a design cross-sectional area of the valve hole, and the difference between the design cross-sectional area of the second rod and the design cross-sectional area of the valve hole and their manufacturing tolerances are determined such that the cross-sectional area of the finished second rod is no smaller than the cross-sectional area of the finished valve hole when the cross-sectional area of the finished second rod is at the minimum tolerated limit and the cross-sectional area of the finished valve hole is at the maximum tolerated limit.
A control valve in a variable displacement compressor that adjusts the discharge displacement in accordance with the inclination of a drive plate located in a crank chamber, wherein the compressor includes a piston operably coupled to the drive plate, the piston being located in a cylinder bore, wherein the piston compresses gas supplied to the cylinder bore from a suction chamber and discharges the compressed gas to a discharge chamber from the cylinder bore, wherein the inclination of the drive plate varies according to the difference between the pressure in the crank chamber and the pressure in the cylinder bore, wherein the compressor further includes the adjusting device for adjusting the differences between the pressure in the crank chamber and the pressure in the cylinder bore, wherein the adjusting device includes the control valve and a gas passage for conducting gas, wherein the control valve regulates the amount of the gas flowing in the gas passage, the control valve comprising:
- a housing, the housing including a valve hole and a valve chamber located in the gas passage, wherein the valve hole communicates with the valve chamber;
- a movable valve body located in the valve chamber in close proximity to the valve hole, wherein the valve body restricts the valve hole;
- a reacting member for reacting to the operating pressure;
- a first rod located between the reacting member and the valve body to transmit the reaction of the reacting member to the valve body;
- a solenoid located on the opposite side of the valve body from the reacting member, the solenoid including a plunger chamber and a plunger movably accommodated in the plunger chamber, wherein a certain level of electric current is applied to the solenoid;
- and
- a second rod located between the plunger and the valve body and located on the opposite side of the valve body from the valve hole, wherein the plunger applies a force to the valve body through the second rod, wherein the force applied by the plunger is based on the level of electric current supplied to the solenoid, and wherein a design cross-sectional area of the second rod is larger than a design cross-sectional area of the valve hole, and the difference between the design cross-sectional area of the second rod and the design cross-sectional area of the valve hole and their manufacturing tolerances are determined such that the cross-sectional area of the finished second rod is no smaller than the cross-sectional area of the finished valve hole when the cross-sectional area of the finished second rod is at the minimum tolerated limit and the cross-sectional area of the finished valve hole is at the maximum tolerated limit.
A method of manufacturing a control valve for adjusting the amount of gas flowing in a gas passage in accordance with an operating pressure applied to the control valve, the control valve having:
- a housing, the housing including a valve hole and a valve chamber located in the gas passage, wherein the valve hole communicates with the valve chamber;
- a movable valve body located in the valve chamber in close proximity to the valve hole, wherein the valve body restricts the valve hole;
- a reacting member for reacting to the operating pressure;
- a first rod located between the reacting member and the valve body to transmit the reaction of the reacting member to the valve body;
- a solenoid for actuating the valve body, the solenoid including a plunger chamber and a plunger movably accommodated in the plunger chamber;
- and
- a second rod located between the plunger and the valve body, wherein the plunger applies a force to the valve body through the second rod, wherein the force applied by the plunger is based on the level of an electric current supplied to the solenoid, the method comprising:
- setting a design cross-sectional area of the second rod and a design cross-sectional area of the valve hole such that the design cross-sectional area of the second rod is larger than the design cross-sectional area of the valve hole, wherein the difference between the design cross-sectional area of the second rod and the design cross-sectional area of the valve hole and their manufacturing tolerances are determined such that the cross-sectional area of the finished second rod is no smaller than the cross-sectional area of the finished valve hole when the cross-sectional area of the finished second rod is at the minimum tolerated limit and the cross-sectional area of the finished valve hole is at the maximum tolerated limit.
A control valve for adjusting the amount of gas flowing in a gas passage in accordance with an operating pressure applied to the control valve, the control valve comprising:
- a housing, the housing including a valve hole and a valve chamber located in the gas passage, wherein the valve hole communicates with the valve chamber;
- a movable valve body located in the valve chamber in close proximity to the valve hole, wherein the valve body restricts the valve hole;
- a reacting member for reacting to the operating pressure;
- a first rod located between the reacting member and the valve body to transmit the reaction of the reacting member to the valve body;
- a solenoid located on the opposite side of the valve body from the reacting member, the solenoid including a plunger chamber and a plunger movably accommodated in the plunger chamber, wherein a certain level of electric current is applied to the solenoid;
- and
- a second rod located between the plunger and the valve body and located on the opposite side of the valve body from the valve hole, wherein the plunger applies a force to the valve body through the second rod, wherein the force applied by the plunger is based on the level of electric current supplied to the solenoid, and wherein a design cross-sectional area of the second rod is larger than a design cross-sectional area of the valve hole, and the difference between the design cross-sectional area of the second rod and the design cross-sectional area of the valve hole and their manufacturing tolerances are determined such that the cross-sectional area of the finished second rod is larger than the cross-sectional area of the finished valve hole when the cross-sectional area of the finished second rod is at the minimum tolerated limit and the cross-sectional area of the finished valve hole is at the maximum tolerated limit.
Dependencies are inferred from the claim text.