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US 4,377,176 AGranted
Pressure reducer for hydraulic brake systems
AssigneeITT Industries, Inc.
InventorsBernd Schopper, Peter Tandler, Derek Lowe
Life of this patent
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Abstract
A pressure reducer for hydraulic brake systems comprises a stepped piston carrying a sealing ring in a circumferential groove thereof. The sealing section of the sealing ring begins at the groove wall adjacent the outlet chamber and joins a transitional section of smaller diameter adjacent the inlet chamber. The sealing ring fills the groove essentially completely at least in the sealing section. Preferably the sealing ring abuts the bottom of the groove over its entire axial length. This results in a defined position for the sealing section without excessive friction and wear occurring during operation.
Claims31
A pressure reducer for hydraulic brake systems comprising:
- a stepped piston displaceable in a housing bore, said stepped piston being loaded by a prestressing force having the end surface of its smaller diameter portion disposed in an inlet chamber and the end surface of its larger diameter portion disposed in an outlet chamber;
- and
- a sealing ring disposed in a circumferential groove in said piston, said groove having one wall adjacent said outlet chamber disposed in a step between said larger diameter portion and said smaller diameter portion extending radially from a bottom of said groove to the outer surface of said larger diameter portion and another wall parallel to said one wall adjacent said inlet chamber extending radially from said bottom of said groove to the outer surface of said smaller diameter portion, said sealing ring having a sealing section of maximum diameter with an end wall thereof abutting said one wall of said groove and a smaller diameter transitional section extending from said sealing section toward said inlet chamber, and said sealing ring completely filling said groove at least adjacent said one wall of said groove and said bottom of said groove in the area of said sealing section, said sealing section sealing an opening in the inner wall of said bore of an axial groove in said housing extending from said outlet chamber toward said inlet chamber.
A pressure reducer for hydraulic brake systems comprising:
- a stepped piston displaceable in a housing bore, said stepped piston being loaded by a prestressing force having the end surface of its smaller diameter portion facing an inlet chamber and the end surface of its larger diameter portion facing an outlet chamber;
- and
- a sealing ring disposed in a circumferential groove of said piston, said sealing ring having a sealing section of maximum diameter abutting one wall of said groove adjacent said outlet chamber and a smaller diameter transitional section extending from said sealing section toward said inlet chamber, said sealing ring completely filling said groove at least adjacent said one wall of said groove and a bottom of said groove in the area of said sealing section, said sealing section sealing an opening in the inner wall of said bore of an axial groove in said housing extending from said outlet chamber toward said inlet chamber;
- said sealing ring abutting said bottom of said groove over the entire length thereof;
- said sealing ring further including a lip extending from said transitional section toward said inlet chamber abutting said bottom of said groove and covering an orifice in said bottom of said groove of at least one return channel connected with said outlet chamber present in said piston.
2 more elements
A pressure reducer for hydraulic brake systems comprising:
- a stepped piston displaceable in a housing bore, said stepped piston being loaded by a prestressing force having the end surface of its smaller diameter portion facing an inlet chamber and the end surface of its larger diameter portion facing an outlet chamber;
- and
- a sealing ring disposed in a circumferential groove of said piston, said sealing ring having a sealing section of maximum diameter abutting one wall of said groove adjacent said outlet chamber and a smaller diameter transitional section extending from said sealing section toward said inlet chamber, said sealing ring completely filling said groove at least adjacent said one wall of groove and a bottom of said groove in the area of said sealing section, said sealing section sealing an opening in the inner wall of said bore of an axial groove in said housing extending from said outlet chamber toward said inlet chamber;
- said sealing ring further including a lip extending from said transitional section toward said inlet chamber abutting said bottom of said groove and covering an orifice in said bottom of said groove of at least one return channel connected with said outlet chamber present in said piston.
1 more element
Dependencies are inferred from the claim text.