Dual-directions braking method of disc brake, braking mechanism and application thereof
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Abstract
A dual-directions braking method of a disc brake, a braking mechanism and applications thereof are applied in fields of automobiles, trains and aircrafts. The dual-directions braking mechanism includes a crankshaft having three concentric sections and two eccentric sections, two friction discs, a friction disc ring and at least a pair of brake calipers and friction pads, wherein the two eccentric sections are respectively provided between each neighboring two of the three concentric sections and mutually disposed at 180°; the two friction discs are respectively provided on the two eccentric sections; the friction disc ring is provided on the main section between the two eccentric sections. Through a translationally rotating friction by the two friction discs respectively with the friction disc ring and with the friction pads of each pair of brake calipers, a backward braking moment and a forward braking moment are simultaneously generated on the main sections, so as to enhance a braking performance twice while keeping a wheel friction load unchanged, compared to conventional backward brakes. An automobile dual-directions braking system including the dual-direction braking mechanism is able to accomplish electronic safety control functions of DABS, DEBD and DESP, and greatly improve transportation safety.
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Citations
5 Claims
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1. (canceled)
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2. A dual-directions braking mechanism for a dual-directions braking method of a disc brake, comprising brake calipers, and further comprising:
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a crankshaft which comprises three concentric sections and two eccentric sections, two friction discs, a friction disc ring, a wheel mounting flange, at least a pair of brake calipers and corresponding caliper mounting frames, wherein; the two eccentric sections are mutually disposed at 180°
, and provided between each neighboring two of the three concentric sections;
two of the three concentric sections are provided at two ends of the crankshaft, and the rest one is provided between the two eccentric sections;
the two friction discs are respectively provided on the two eccentric sections;
the friction disc ring, provided on the concentric section between the two eccentric sections, is clipped and resisted between the two friction discs, so that two surfaces of the two friction discs obtain identical operation pressure bearing capability along axial directions of the two eccentric sections while obtaining dual-directions braking moments operation capability in a rotation direction of the three concentric sections;
the two concentric sections at the two ends of the crankshaft are respectively adapted to mount the wheel mounting flange and for a rotary connection to bearings of a wheel shaft;
the pair of brake calipers comprises a friction pad pair whose operation surfaces are opposite to each other, and at least a hydraulic wheel cylinder for supplying the friction pad pair with opposite operation pressures to ensure that the operation surfaces of the friction pad pair are both able to contact and rub with the two surfaces of the two friction discs when the friction pad pair is at work;
all of the caliper mounting frames are fixedly connected to or integrated with a static sleeve of the wheel shaft;
each pair of brake calipers is mounted on the corresponding caliper mounting frame, in such a manner that the hydraulic wheel cylinder and the friction pad pair are able to simultaneously provide the operation surfaces between the two friction discs and the friction disc ring with the axial operation pressure;when the braking mechanism is idle, namely at a non-operational recovery state, no contact and no friction exists between the two friction discs and the operation surface of the friction pad pair of each pair of brake calipers;
the two friction discs and the friction disc ring synchronously revolve with the crankshaft around an axis of the three concentric sections merely through the mutual rotating static friction, and have no braking moment on the concentric sections;when the braking mechanism starts to operate, in accordance to an instant rotation velocity of the three concentric sections of the crankshaft, firstly the hydraulic wheel cylinder of each pair of brake calipers synchronously generates a “
rising slope wave pressure”
, and drives the friction pad pair to move towards each other so that the operation surfaces of the friction pad pair of the pair of brake calipers contact with the two friction discs at the same time and generate the axial operation pressure;
under the axial operation pressure, the two friction discs start to revolve synchronously around the axis of the three concentric sections in a revolving direction, and meanwhile rotate respectively around two axes of the two eccentric sections of the crankshaft in a direction opposite to the revolving direction;
in the meantime, the friction disc ring rotates around the axis of the three concentric sections in the direction opposite to the revolving direction;
therefore, between the two friction discs and the operation surfaces of the friction pad pair of each pair of brake calipers, and between the two friction discs and the operation surfaces of the friction disc ring, a translationally rotating friction instant impulse process, which is inherent when the braking mechanism starts to operate, is formed synchronously;when the two friction discs finish the translationally rotating friction instant impulse process and readily enter a translationally rotating friction stable operation process, the hydraulic wheel cylinder readily stops generating the “
rising slope wave pressure”
, and readily generates an operation pressure of an arbitrary waveform which is exerted onto the friction pad pair of each pair of brake calipers, the two friction discs and the friction disc ring, so as to ensure the translationally rotating friction stable operation of the two friction discs;
accordingly, a backward braking moment in a direction opposite to the rotation direction of the concentric sections of the crankshaft and a forward braking moment in a direction identical to the rotation direction thereof are generated simultaneously and respectively by the concentric sections of the crankshaft; andwhen the braking mechanism finishes operating, in accordance to the instant rotation velocity of the three concentric sections of the crankshaft, the hydraulic wheel cylinder of each pair of brake calipers synchronously generates a “
falling slope wave pressure”
with a variable slope, so as to rapidly finish a translationally rotating friction instant impulse process, which is inherent when the braking mechanism finishes operating, among the friction pad pair, the two friction discs and the friction disc ring;
then, the friction pad pair of each pair of brake calipers is synchronously separated from the operation surfaces of the two friction discs;
the two friction discs and the friction disc ring simultaneously stop rotating in the direction opposite to the revolving direction around the crankshaft and actively returns to the non-operational recovery state. - View Dependent Claims (3, 4, 5)
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Specification