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US 9,174,620 B2Granted
Slip control braking pump having a high pressure sealing structure
AssigneeKelsey-Hayes Company
InventorJoseph A. Starr
Life of this patent
Estimating the term…
Abstract
A vehicular hydraulic braking pump includes a sleeve having an inner bore defining an inner bore surface and a piston having a stop collar and a ramped seal face. The stop collar, ramped seal face, and the inner bore cooperating to define a seal pocket which traps a high pressure seal therein. The ramped seal face provides contact of the high pressure seal to the sleeve inner bore that is proportional to fluid pressure acting on the high pressure seal.
Claims20
A vehicular hydraulic braking pump comprising:
- a sleeve having an inner bore defining an inner bore surface;
- a piston having a stop collar and a ramped seal face, the stop collar, ramped seal face, and the inner bore cooperating to define a seal pocket having a geometry that promotes a self-energizing seal interface;
- and
- a high pressure seal disposed in the seal pocket, the high pressure seal creating the self-energizing seal interface with the seal pocket by increasing a sealing pressure between the sleeve inner bore and the piston during exposure to a high pressurized hydraulic fluid acting against the high pressure seal during a fluid compression stroke of the piston and relaxing contact between the sleeve inner bore and the piston during a fluid intake stroke of the piston.
1 more element
A vehicle braking system comprising:
- a master cylinder;
- and
- a hydraulic control unit (HCU) in fluid communication with the master cylinder and a plurality of wheel brakes, the HCU comprising:
- a hydraulic braking pump including a sleeve having an inner bore defining an inner bore surface, a piston having a ramped seal face, and a high pressure seal disposed between the ramped seal face and the inner bore, the ramped seal face defining a first region that contacts the high pressure seal and a second region that defines a clearance between the high pressure seal and the ramped seal face.
1 more element
A reciprocating piston pump comprising:
- a sleeve having an inner bore;
- a piston disposed within the sleeve inner bore, the piston having a stop collar defining a backing seal surface and a ramped seal face, the stop collar, ramped seal face, and the inner bore defining a seal pocket;
- a high pressure seal disposed within the seal pocket, the high pressure seal being in contact with the sleeve inner bore and a portion of the ramped seal face, the high pressure seal being formed from a low strain material that deforms into general conformance with the seal pocket against a high fluid pressure during a piston compression stroke and relaxes during a low fluid pressure exposure;
- and
- an eccentric that causes the piston to reciprocate within the sleeve inner bore whereby the high pressure seal contacts a greater portion of the ramped seal face as the speed that the piston reciprocates increases.
2 more elements
A vehicular hydraulic braking pump comprising:
- a sleeve having an inner bore defining an inner bore surface;
- a piston having a stop collar and a ramped seal face, the stop collar, ramped seal face, and the inner bore cooperating to define a seal pocket, the ramped seal face defining a first region that contacts the high pressure seal and a second region that defines a clearance between the high pressure seal and the ramped seal face;
- and
- a high pressure seal disposed in the seal pocket.
1 more element
Dependencies are inferred from the claim text.