A vehicle braking system that primarily operates as a pure brake-by-wire system, with optional hydraulic actuation. The system includes a set of four electrically actuated drum brakes. At least two of the wheel brakes include hydraulic actuators that operate to apply the wheel brakes independent of electric control. Each of the wheel brakes is normally operated in response to a control signal generated by the vehicle's brake processor. As such, a primary brake-by-wire system is provided at all four vehicle wheels. The rear brakes are proportioned to the front brakes electrically, according to design criteria.

Vehicle braking system

An automotive vehicle drum brake including a brake drum for connected to the vehicle wheel and a backing plate for connected to the vehicle. At least one brake shoe is and pivotally mounted with respect to the backing plate. A non-rotative nut mounted for linear motion with respect to said backing plate and has a pivotal connection with the brake shoe. A power screw is threadably engaged with the nut. An electric motor powers the power screw to turn the same to actuate the brakes. A parking brake mechanism is also provided by a coil spring which surrounds a drum which is connected with the power train from and including the electrical motor and the power screw. An actuator is provided to move the coil spring to an unwound position to allow the parking brake to release.

Electric drum brake

The parking brake lever cable retainer (90) comprises a wire form spring retainer (90) attached to a parking brake lever (40) in order to couple a cable (50) and cable ball (82) with the end of the lever (40). The lever (40) includes a pair of spaced-apart end feet (44, 45) with a longitudinal recess (46) extending therebetween such that the cable (50) is disposed within the longitudinal recess (46) and extends from one side (41) of the lever (40) to the opposite side (43) where the cable ball (82) is received within complementary-shaped openings (42) in each of the feet (44, 45). The wire form spring retainer (90) comprises a pair of arc-shaped resilient legs (91, 93) extending laterally across the lever (40) from free ends (91A, 93A) exerting opposite forces (D, E) against engagement slots (49) at the opposite side (43) of the lever (40), and at the one side (41) of the lever (40) the legs (91, 93) form a looped, generally circular-shaped portion (98) that engages the cable ball (82) and biass the cable ball (82) into the complementary-shaped openings (42). The cable (50) is free to travel downwardly as it pivots about the cable ball (82).

Parking brake lever cable retainer

A brake cable fixing device for the expanding lock of a parking brake is described making possible an easy installation of a brake cable. A tapered cable end nipple of the brake cable is guided during installation by a funnel-shaped entry space, constituted by the outer edges of the fork of an actuating lever and by an elastic leg of a securing element positioned on a forked pressure bracket. Insertion of the cable and nipple deflects the elastic leg of the securing element, allowing the end nipple to pass by, and the restoring force of the elastic leg urges the cable end nipple into position in the fork of the actuating lever. The securing element is described as a spring clasp, having a pair of spring legs connected at a vertex, one spring leg constituting the elastic leg, the other spring leg engaging the endwall of the pressure bracket to mount the securing element thereto.

Brake cable fixing device for a parking brake, in particular for a duo-servo hat-section-type parking brake

A brake cable-connecting apparatus for a drum brake, having a simplified structure and designed to permit a cable end to be steadily seated on a brake lever, thereby providing improved durability of an inner cable, and to further positively holds a brake cable in position, which otherwise would be disengaged from the brake lever. A drum brake comprises: slanted surfaces 27 c , 28 c for permitting an inner cable 29 a to be deflected while a cable end 29 b of a brake cable 29 is slid along an outer edge of a free end 26 a of a brake lever 26, the cable end 29 b being advanced from a direction in which the brake cable 29 is pulled, to a opposite direction in which the brake cable 29 is pulled; and, an opening formed in series with a cable-receiving groove 26 b for receiving the inner cable 29 a.

Brake cable-connecting apparatus for drum brake

A one piece spring clip is positioned on a headed brake shoe hold-down pin so that the spring clip is compressed with a camming action until the clip reaches an over-center condition. Further installing movement of the spring clip permits the spring to expand and lock itself in the installed position. The spring has a primary spring section absorbing normal compression loads and secondary spring sections resisting excessive compression loads.

Shoe hold-down pin and spring clip

A drum brake assembly having a parking brake actuating lever is provided so that the parking brake cable end may be assembled in a blind fashion to the actuating lever. The cable is provided with a button. A spring is attached to the lever and to the backing plate about a parking brake cable opening. The spring end attached to the lever has a ramp section and a hook end, the ramp section being in a tapered open channel formed on the lever end and the hook end being secured to the lever. The cable button is inserted axially through the backing plate opening through the spring, being guided by the spring, into the channel. Further insertive movement of the cable button causes the button to be deflected upwardly by the coil spring ramp portion and the channel sides, side loading the cable. When the button passes the end of the ramp portion and the channel smaller end, the stored force in the cable because of the side loading moves the cable and the button downwardly in the channel. The button moves into tension a force-transmitting engagement with the edges of the channel smaller end so that as the cable is then tensioned the lever will be moved to actuate the brake.

Blind cable assembly

A drum brake is provided of the leading-trailing shoe type in which a single piece spring installed as a part of the assembly holds down the brake shoe assemblies against the backing plate and also retracts the shoes after brake actuation. The single piece spring also retains the lower ends of the shoes against the anchor plate. This arrangement eliminates the need for separate shoe hold-down springs and separate upper and lower return springs, resulting in a significant reduction in parts and labor for assembly.

Unispring drum brake assembly

A single generally U-shaped wire spring has a partial loop formed in the center and fitting over an anchor for a leading-trailing shoe assembly. Each arm of the spring extends along the web of a shoe and terminates in a hook end which fits within a slot in the associated shoe web. The slots are so located in the web to obtain the desired distribution of spring loads on the adjuster/strut assembly and on the anchor plate. The spring will return the brake shoes to the adjuster/strut assembly after actuation of the wheel cylinder during service brake function; retain the lower ends of the shoes against the anchor plate; and hold the shoes against the backing plate by the force component of the spring wire acting against the bottom side of the cable support and against the top of the outer ramp of the anchor plate, resulting in a spring load directed onto the web of each shoe.

Drum brake assembly and shoe hold-down and retraction spring therefor

Frein a tambour

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