Hydraulic control unit for an electronically controlled brake system
AssigneeContinental Teves, Inc.
InventorAdrian Crimpita
Life of this patent
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Abstract
A hydraulic control unit of an electronically controlled hydraulic brake system has a housing (49) accommodating a pump (35) and at least one low-pressure accumulator. The low-pressure accumulator is positioned in a location at a lower height than the cam cavity (51) of the pump (35), and a drainage bore (53) connects the cam cavity (51) with the spring chamber (68) of at least one of the low-pressure accumulators. This allows the drainage of brake fluid from the cam cavity (51) into the spring chamber (68) solely by way of gravity. Thus this measure eliminates the risk of damage to the pump motor in the event that ambient water penetrates the cam cavity (51), which might flush brake fluid from the cam cavity 51 into the housing (49) of the pump motor.
Claims3
A hydraulic control unit for an automotive brake system with a housing (49) containing a cavity (51) for a cam shaft of a hydraulic pump (35) and a low-pressure accumulator (54), which is at least in part accommodated in the housing (49) and positioned in a location at a lower height than the cam cavity (51), the low-pressure accumulator (54) having an interior space with an accumulator piston (59) dividing the interior space into an accumulator chamber (73) and a spring chamber (68), the piston (59) being biased toward the accumulator chamber (73) by means of a spring (61) arranged in the spring chamber (68),
- wherein a drainage bore (53) connects the cam cavity (51) with the spring chamber (68) and the spring chamber (68) of the low-pressure accumulator (54) is closed off against the ambience by means of a steel cap (63) attached to the housing (49) and wherein the steel cap (63) comprises a radially extending peripheral rim (55) located inside the housing (49), the radially extending peripheral rim (55) comprising at least one perforation (74) establishing a hydraulic connection between the drainage bore (53) and the spring chamber (68).
A hydraulic control unit for an automotive brake system with a housing (49) containing a cavity (51) for a cam shaft of a hydraulic pump (35) and a low-pressure accumulator (54), which is at least in part accommodated in the housing (49) and positioned in a location at a lower height than the cam cavity (51), the low-pressure accumulator (54) having an interior space with an accumulator piston (59) dividing the interior space into an accumulator chamber (73) and a spring chamber (68), the piston (59) being biased toward the accumulator chamber (73) by means of a spring (61) arranged in the spring chamber (68),
- wherein a drainage bore (53) connects the cam cavity (51) with the spring chamber (68) and the spring chamber (68) of the low-pressure accumulator (54) is closed off against the ambience by means of a steel cap (63) attached to the housing (49) and wherein the steel cap (63) comprises a radially extending peripheral rim (75) located inside the housing (49), a washer (70) adjacent to the radially extending peripheral rim (75) is provided with at least one radial recess (71) which establishes a hydraulic connection between the drainage bore (53) and the spring chamber (68).
Dependencies are inferred from the claim text.