Metering check valve for active brake pads retraction system
First Claim
Patent Images
1. A braking system of a motor vehicle, comprising:
- an active brake pads refraction system comprising;
an hydraulic brake line having a pressurizable brake fluid therewithin;
at least one brake corner, each brake corner comprising;
a brake caliper connected to said brake line; and
a pair of brake pads connected with said brake caliper in oppositely disposed relation to each other; and
a metering check valve at each brake corner disposed between said hydraulic brake line and the brake caliper thereof, said metering check valve having a predetermined retraction volume therewithin, wherein brake fluid flows through said retraction volume in a first direction in response to brake pad application, and in a second direction, opposite to said first direction, in response to brake pad retraction;
wherein when said active brake pads retraction system pressurizes said brake fluid to a pressure below atmospheric pressure, then said brake caliper responsively retracts said brake pads away from each other; and
wherein the brake pads retraction is provided by brake fluid passing through said metering check valve in said second direction such that the retraction is limited by the retraction volume.
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Abstract
In an active brake pads retraction system, the improvement is a metering check valve which limits the retraction. The metering check valve is interfaced with an anti-lock brake system (ABS), disposed in the hydraulic brake line between the brakes apply system of the ABS and a caliper member of the ABS located at each brake corner. Brake pads are retracted with respect to the brake rotor responsive to predetermined conditions of the motor vehicle in which braking is not required, wherein a retraction volume within the metering check valve limits the amount of brake pads retraction.
47 Citations
11 Claims
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1. A braking system of a motor vehicle, comprising:
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an active brake pads refraction system comprising; an hydraulic brake line having a pressurizable brake fluid therewithin; at least one brake corner, each brake corner comprising; a brake caliper connected to said brake line; and a pair of brake pads connected with said brake caliper in oppositely disposed relation to each other; and a metering check valve at each brake corner disposed between said hydraulic brake line and the brake caliper thereof, said metering check valve having a predetermined retraction volume therewithin, wherein brake fluid flows through said retraction volume in a first direction in response to brake pad application, and in a second direction, opposite to said first direction, in response to brake pad retraction; wherein when said active brake pads retraction system pressurizes said brake fluid to a pressure below atmospheric pressure, then said brake caliper responsively retracts said brake pads away from each other; and wherein the brake pads retraction is provided by brake fluid passing through said metering check valve in said second direction such that the retraction is limited by the retraction volume. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. In an active brake pads refraction system comprising an hydraulic brake line having a pressurizable brake fluid therewithin;
- at least one brake corner, each brake corner comprising a brake caliper connected to said hydraulic brake line by a brake line caliper portion, and a pair of brake pads connected with said brake caliper in oppositely disposed relation to each other;
the improvement thereto comprising a metering check valve for an active brake pads retraction system, comprising;a valve body comprising a valve cylinder and a valve chamber fluidically communicating with said valve cylinder; an inlet port connected with said valve cylinder, said inlet port being adapted for connection to said hydraulic brake line; an outlet port connected with said valve chamber, said outlet port being adapted for connection to said brake line caliper portion; a valve piston movably disposed in said valve cylinder, wherein said valve piston has formed therein an internal passage, wherein the movement of said piston includes movement in which said passage is sealingly closed by said valve cylinder in which fluid is prevented from flowing therethrough between said inlet and outlet ports, and includes movement in which said passage is open to said valve chamber in which fluid is able to flow therethrough between said inlet and outlet ports; and a valve spring disposed in said valve chamber, said valve spring biasing said valve piston to a spring neutral position whereat said valve piston is disposed remote from said inlet port and said internal passage is sealingly closed by said valve cylinder; wherein the movement of the valve piston includes a predetermined retraction volume therewithin; wherein when said hydraulic brake line is pressurized below atmospheric pressure, said brake caliper responsively retracts said brake pads away from each other; and wherein the retraction is limited by the retraction volume. - View Dependent Claims (9)
- at least one brake corner, each brake corner comprising a brake caliper connected to said hydraulic brake line by a brake line caliper portion, and a pair of brake pads connected with said brake caliper in oppositely disposed relation to each other;
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10. A method for retracting brake pads at each brake corner of a motor vehicle, comprising the steps of:
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determining predetermined conditions of the motor vehicle, wherein the predetermined conditions comprise a determination whether the brakes are applied and whether braking is not required; applying negative pressure with respect to atmospheric pressure to a brake line of the motor vehicle if said step of determining determines that the brakes are not applied and braking is not required; establishing a retraction volume in a metering check valve in response to said step of applying negative pressure; and retracting the brake pads in response to said step of applying negative pressure; wherein the retracting is limited responsive to the established retraction volume. - View Dependent Claims (11)
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Specification