Patent ID: 6099281
Filing Date: 2000-08-08
Classification: F04B

Abstract:
A variable displacement load device having a center of operation, comprising:at least two spherical balls having a radius of curvature;a front cover housing having a port, and channel, said port able to direct inlet pressure to said mechanical face seal, said channel having an involute profile, a depth, a tangent, and a radius of curvature, said channel involute profile having four regions comprised of two regions of involute curves, a radius dwell region, and a blended radius region;a rotor having slots, two sides, an inner and outer diameter and a center, said slots each having a radius of curvature, ports and an angle, said slot angle being aligned with said tangent of said channel involute profile, said slots mirroring one another on said sides of said rotor, said slots rotate around said channel of said front cover housing, said ports being able to allow a fluid to enter and exit said rotor slots, said slots radius of curvature being minimized as compared to said channel radius of curvature thus allowing said balls to roll within said channel involute profile and limit internal leakage;a variable seal plug having a hole, said hole providing a path for said fluid to move in and out of said rotor slots, said variable seal plug mounted to said rear cover;a variable vane shaft having an external drive, said variable vane shaft able to vary its location with respect to said housing channel by said external drive; and,a rear cover housing having a mounting surface, an inlet port, channels, said port able to direct low pressure to said variable seal plug and variable vane shaft, said channels having an involute profile, a depth, a tangent, and a radius of curvature, said channel involute profile having four regions comprised of two regions of involute curves, a radius dwell region, and a blended radius region.