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US 4,096,786 AGranted
Rotary fluid energy translating device
AssigneeSundstrand Corporation
InventorGeorge A. Schauer
Life of this patent
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AssigneeSundstrand Corporation
InventorGeorge A. Schauer
Estimating the term…
A rotary fluid energy translating device having reduced noise levels and having a rotatable cylinder block with a plurality of cylinders therein and each having a movable piston, valve means having inlet and outlet port means adapted to serially connect with the cylinders and also having a pair of cross-over areas positioned to block a cylinder from simultaneous communication with the inlet and outlet port means and with the pistons within the cylinders adjacent one cross-over area positioned to provide a small fluid volume in the associated cylinders and positioned to provide a large fluid volume in the cylinders adjacent the other cross-over area. Each cross-over area has at least one trapped fluid chamber, with a restricted flow passage positioned to communicate with a cylinder and a piston is positioned in each of the trapped fluid chambers and movable to positions to vary the volume of the chamber. Pilot lines extended to the port means and associated one with each trapped fluid chamber are operable to control the position of the pistons in the trapped fluid chambers to have a small volume chamber when an adjacent cylinder of the cylinder block has a small fluid volume and to have a large volume trapped fluid chamber when an adjacent cylinder of the cylinder block has a large fluid volume.
A rotary fluid energy translating device comprising, a rotatable cylinder block having a plurality of cylinders therein, valve means having inlet and outlet port means adapted to serially connect with the cylinders and a pair of cross-over areas positioned to block a cylinder from simultaneous communication with the inlet and outlet port means, each of said cylinders having a movable member with the members of the cylinders adjacent one cross-over area positioned to provide small fluid volume in the associated cylinders and the members of the cylinders adjacent the other cross-over area positioned to provide large fluid volume in the associated cylinders, a trapped fluid chamber in each of said cross-over areas having a flow passage positioned to communicate with a cylinder prior to a cylinder communicating with one of the port means in order to reduce the rate of pressure change when a cylinder subsequently communicates with one of said port means, movable means in each chamber to vary the volume of said chamber, and means for controlling said movable means to have a small volume chamber when an adjacent cylinder has a small fluid volume and to have a large volume chamber when an adjacent cylinder has a large fluid volume.
An axial piston-type variable displacement pump including a rotatable cylinder block with a series of cylinders each having a reciprocal piston and a movable swash plate for controlling the stroke of the pistons and operable to reverse the delivery of the pump, a valve plate adjacent the cylinder block and having inlet and outlet port means for controlling flow of fluid to and from said cylinders and having a pair of cross-over areas separating adjacent ends of said port means, a pair of trapped fluid chambers associated one with each cross-over area and each having a flow passage extending into communication with a cylinder at said cross-over areas, the fluid volume of said cylinders adjacent the two cross-over areas differing with the pistons at one cross-over area being extended to provide small cylinder volume and the pistons at the other cross-over area being retracted to provide large cylinder volume, means for varying the size of said trapped fluid chambers, and means for controlling the size-varying means to have a relatively large fluid chamber coact with a cylinder of large fluid volume and a smaller fluid chamber coact with a cylinder of smaller fluid volume.
An axial piston-type motor including a rotatable cylinder block with a series of cylinders each having a reciprocal piston and a swashplate for controlling the stroke of the pistons, a valve plate adjacent the cylinder block and having inlet and outlet port means for controlling flow of fluid to and from said cylinders and having a pair of crossover areas separating adjacent ends of said port means, a pair of trapped fluid chambers associated one with each crossover area and each having a flow passage extending into communication with a cylinder at said cross-over areas, the fluid volume of said cylinders adjacent the two cross-over areas differing with the pistons at one cross-over area being extended to provide small cylinder volume and the pistons at the other cross-over area being retracted to provide large cylinder volume, means for varying the size of said trapped fluid chambers, and means for controlling the size-varying means to have a relatively large fluid chamber coact with a cylinder of large fluid volume and a smaller fluid chamber coact with a cylinder of smaller fluid volume.
An axial piston-type variable displacement pump including a rotatable cylinder block with a series of cylinders each having a reciprocal piston and a movable swashplate for controlling the stroke of the pistons and operable to reverse the delivery of the pump, a valve plate adjacent the cylinder block and having inlet and outlet port means for controlling flow of fluid to and from said cylinders and having a pair of cross-over areas separating adjacent ends of said port means and an arcuate length greater than the diameter of a cylinder to prevent a cylinder communicating simultaneously with both port means, a pair of trapped fluid chambers associated one with each cross-over area and each having a flow passage extending into communication with a cylinder at said cross-over areas, the fluid volume of said cylinders adjacent the two cross-over areas differing with the pistons at one cross-over area being extended to provide small cylinder volume and the pistons at the other cross-over area being retracted to provide large cylinder volume, means including a piston for varying the size of said trapped fluid chambers, and means for controlling the size-varying means to have a relatively large fluid chamber coact with a cylinder of large fluid volume and a smaller fluid chamber coact with a cylinder of smaller fluid volume including a pair of fluid pilot lines in the valve plate extended one from each of said port means to a chamber for having the position of a piston responsive to the fluid pressure in one of the port means as opposed to the fluid pressure in a cylinder communicating with the associated flow passage each of said trapped fluid chambers having the associated pilot line communicating with said one of the port means which the cylinder is travelling away from during rotation of the cylinder block.
An axial piston-type motor including a reversibly rotatable cylinder block with a series of cylinders each having a reciprocal piston and a swash plate for controlling the stroke of the pistons, a valve plate adjacent the cylinder block and having inlet and outlet port means for controllingflow of fluid to and from said cylinders and having a pair of cross-over areas separating adjacent ends of said port means and of an arcuate length greater than the diameter of a cylinder to prevent a cylinder communicating simultaneously with both port means, a pair of trapped fluid chambers associated one with each cross-over area and each having a flow passage extending into communication with a cylinder at said crossover areas, the fluid volume of said cylinders adjacent the two cross-over areas differing with the pistons at one crossover area being extended to provide small cylinder volume and the pistons at the other cross-over area being retracted to provide large cylinder volume, means including a piston for varying the size of said trapped fluid chambers, and means for controlling the size-varying means to have a relatively large fluid chamber coact with a cylinder of large fluid volume and a smaller fluid chamber coact with a cylinder of smaller fluid volume including a pair of fluid pilot lines in the valve plate extended one from each of said port means to a chamber for having the position of a piston responsive to the fluid pressure in the port means as opposed to the fluid pressure in a cylinder communicating with the associated flow passage and each of said trapped fluid chambers having the associated pilot line communicating with the port means toward which the cylinder is travelling during rotation of the cylinder block.
Dependencies are inferred from the claim text.