Patent ID: 8926298
Filing Date: 2015-01-06
Classification: F04B,Y10T

Abstract:
1. A pump comprising: a cylinder block with an inlet port, an outlet port, a plurality of cylinders disposed in the cylinder block, a plurality of inlet passages each connected between the inlet port and a different one of the plurality of cylinders, and a plurality of outlet passages each connected between the outlet port and a different one of the plurality of cylinders; a plurality of pistons each slideably received in a different one of the plurality of cylinders; a drive shaft rotatably received in the cylinder block for driving the plurality of pistons within the plurality of cylinders; and a throttle member extending across the plurality of inlet passages and having a plurality of control apertures there through, wherein each control aperture has a transverse cross sectional shape with a primary region from which a tapered region projects, the throttle member being moveable relative to the cylinder block to alter alignment between the plurality of inlet passages and the plurality of control apertures.