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US 6,742,441 B1Granted
Continuously variable displacement pump with predefined unswept volume
AssigneeHalliburton Energy Services, Inc.
InventorsJim B. Surjaatmadja, Stanley V. Stephenson
Life of this patent
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Abstract
Apparatus and method for controlling an unswept volume in a piston system. The method includes rotating a shaft around a rotation point to drive a piston within a cylindrical volume in a periodic manner, modifying the stroke length of the piston, and moving the center of the shaft relative to the cylindrical volume such that a change in an unswept volume or compression ratio is controlled.
Claims14
A piston system, comprising:
- a shaft adapted to rotate about its center;
- a cylindrical volume;
- a piston disposed in the cylindrical volume, wherein the piston is adapted to slidably move within the cylindrical volume;
- a linkage coupling the shaft to the piston;
- a first adjusting mechanism to adjust the relative position of the linkage to the center of the shaft thereby changing the stroke length of the piston;
- and
- a second adjusting mechanism coupled to the shaft for moving the center of the shaft relative to the cylindrical volume to control an unswept volume in the cylindrical volume.
4 more elements
A piston system, comprising:
- a shaft having a longitudinal axis;
- a concentric wheel coupled to the shaft;
- a fixed cam coupled to the concentric wheel;
- a rotatable cam coupled to the fixed cam, wherein the rotatable cam is adapted to rotate with respect to the fixed cam;
- a piston coupled to the rotatable cam, wherein the piston is adapted to slidably move within a cylindrical volume;
- and
- an adjusting mechanism coupled to the shaft and adapted to move the longitudinal axis of shaft relative to the cylindrical volume;
- an input power gear coupled to the concentric wheel;
- a control gear coupled to the shaft;
- and
- a connector gear adapted to engage the input power gear and the control gear.
8 more elements
A piston system, comprising:
- a shaft having a longitudinal axis;
- a concentric wheel coupled to the shaft;
- a fixed cam coupled to the concentric wheel;
- a rotatable cam coupled to the fixed cam, wherein the rotatable cam is adapted to rotate with respect to the fixed cam;
- a piston coupled to the rotatable cam, wherein the piston is adapted to slidably move within a cylindrical volume;
- an adjusting mechanism coupled to the shaft and adapted to move the longitudinal axis of shaft relative to the cylindrical volume;
- an input power gear coupled to the concentric wheel;
- a control gear coupled to the shaft;
- a first connector gear adapted to engage the input power gear;
- and
- a second connector gear adapted to engage the first connector gear and the control gear.
8 more elements
Dependencies are inferred from the claim text.