Variable-delivery, fixed-displacement pump
AssigneeCaterpillar Inc.
InventorHaoran Hu
Life of this patent
Estimating the term…
Abstract
A pump includes a pump housing, a rotating shaft extending through the pump housing, a plurality of pistons, and a plurality of control sleeves. Each piston may be at least partially, slidably contained within a respective piston sleeve. The pistons may also be be operably coupled to the rotating shaft such that rotation of the shaft rotates and reciprocates the pistons. Each control sleeve may be slidably disposed on a respective one of said piston sleeves and operable to selectively vary the amount of fluid delivered by the pump.
Claims20
A pump comprising:
- a pump housing;
- a rotating shaft rotatably connected to the pump housing;
- a plurality of pistons, each piston at least partially, slidably contained within a respective piston sleeve, the pistons being operably coupled to the rotating shaft such that rotation of the shaft reciprocates the pistons;
- and
- a plurality of control sleeves, each control sleeve being slidable relative to a respective one of said piston sleeves and being operable to selectively vary the amount of fluid delivered by the pump.
A method of delivering an amount of pressurized fluid from a pump, comprising:
- reciprocating a plurality of pistons in a plurality of respective piston sleeves through a retracting stroke and a compression and delivery stroke;
- and
- operably moving a control sleeve to selectively vary a flow of fluid through a sleeve port in the piston sleeve during the retracting stroke so as to vary the amount of fluid delivered by the pump.
A hydraulically actuated system, comprising:
- a pump including a rotating shaft, a plurality pistons, and a plurality of control sleeves, each piston at least partially, slidably contained within a respective piston sleeve, the pistons being operably coupled to the rotating shaft such that rotation of the shaft reciprocates the pistons, each control sleeve being slidable relative to a respective one of said piston sleeves and being operable to selectively vary the amount of fluid delivered by the pump;
- a high pressure rail fluidly coupled with the pump;
- at least one hydraulically actuated fuel injector connected to the high pressure rail;
- and
- an electronic control module configured to control said control sleeves.
Dependencies are inferred from the claim text.