Rotary hydraulic machine and controls
First Claim
1. A rotary hydraulic machine comprising a housing, a rotating group within said housing including a barrel and a plurality of pistons slideable within cylinders formed in said barrel, a swashplate operable upon said pistons to induce reciprocation thereof in respective ones of said cylinders to transfer fluid between an inlet port and an outlet port as said barrel rotates about its axis of rotation, and an actuator operable upon said swashplate to adjust the disposition thereof relative to said housing about an adjustment axis orthogonal to said axis of rotation of said barrel and thereby vary the stroke of said pistons in said cylinders, said swashplate having a bearing surface engagable with a complementary surface on said housing and a fluid bearing interposed between said surfaces, said fluid bearing including a pair of recesses formed between said surfaces, each of said recesses having a major dimension along a longitudinal axis, said longitudinal axis extending parallel to said adjustment axis of said swashplate, and a fluid supply to provide fluid to said recesses.
2 Assignments
0 Petitions
Accused Products
Abstract
A variable capacity hydraulic machine has a rotating group located within a casing and a control housing secured to the casing to extend across and seal an opening in the casing. The control housing accommodates a control circuit and a pair of sensors to sense change in parameters associated with the rotating group. One of the sensors is positioned adjacent the barrel on the rotating group to sense rotational speed and the other senses displacement of the swashplate. The control housing accommodates a control valve and accumulator to supply fluid to the control valve.
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Citations
40 Claims
- 1. A rotary hydraulic machine comprising a housing, a rotating group within said housing including a barrel and a plurality of pistons slideable within cylinders formed in said barrel, a swashplate operable upon said pistons to induce reciprocation thereof in respective ones of said cylinders to transfer fluid between an inlet port and an outlet port as said barrel rotates about its axis of rotation, and an actuator operable upon said swashplate to adjust the disposition thereof relative to said housing about an adjustment axis orthogonal to said axis of rotation of said barrel and thereby vary the stroke of said pistons in said cylinders, said swashplate having a bearing surface engagable with a complementary surface on said housing and a fluid bearing interposed between said surfaces, said fluid bearing including a pair of recesses formed between said surfaces, each of said recesses having a major dimension along a longitudinal axis, said longitudinal axis extending parallel to said adjustment axis of said swashplate, and a fluid supply to provide fluid to said recesses.
- 11. A rotary hydraulic machine comprising a housing, a rotating group within said housing including a barrel and a plurality of pistons slidable within cylinders formed in said barrel, a swashplate operable upon said pistons to induce reciprocation thereof in respective ones of said cylinders to transfer fluid between an inlet port and an outlet port as said barrel rotates, and an actuator operable upon said swashplate to adjust the disposition thereof relative to said housing and thereby vary the stroke of said pistons in said cylinders, said swashplate including a body having a part cylindrical bearing face and an oppositely directed planar face engaged by said pistons with said part cylindrical bearing face engaging a complementary surface of said housing and defining an adjustment axis of said swashplate, a fluid bearing between said bearing face and said complementary surface and including a pair of recesses having a major dimension along a longitudinal axis, said longitudinal axis extending in a direction parallel to said adjustment axis of said swashplate, said body extending along said axis of rotation beyond said barrel to provide an extension of said body to one side of said barrel, said actuator including a pair of motors each engaging said extension on opposite sides of said adjustment axis to impart rotation in opposite directions to said swashplate, said actuators thereby being offset to one side of said barrel.
- 29. A rotary hydraulic machine comprising a housing, a rotating group within said housing including a barrel and a plurality of pistons slidable within cylinders formed in said barrel, a swashplate operable upon said pistons to induce reciprocation thereof in respective ones of said cylinders to transfer fluid between an inlet port and an outlet port as said barrel rotates about a longitudinal axis, a bearing assembly to support said swashplate in said housing for rotation relative to said housing about an adjustment axis and an actuator operable upon said swashplate to adjust the disposition thereof relative to said housing and thereby vary the stroke of said pistons in said cylinders, said swashplate including a body having a planar face engaged by said pistons and an extension to one side of said barrel having a pair of convex abutments protruding from said extension on opposite sides of said axis of rotation and said longitudinal axis, and said actuator including a pair of motors each having an end face and engaging a respective one of said convex abutments on said extension on opposite sides of said axis of rotation to impart rotation in opposite directions to said swashplate, said convex abutments being positioned on said extension relative to said axis of rotation such that the points of contact of said convex abutments with said end faces of said motors lie on a common diameter passing through said adjustment axis of said swashplate, when said common diameter is perpendicular to an axis of each of said motors, said convex abutments thereby rolling across said end face of said motors as said swashplate is adjusted and thereby avoiding relative sliding therebetween.
Specification