Brakes – Wheel – Axially movable brake element or housing therefor
Patent
1995-09-12
1997-04-22
Butler, Douglas C.
Brakes
Wheel
Axially movable brake element or housing therefor
188 7343, 188 7345, 188112R, B60T 720
Patent
active
056222416
ABSTRACT:
A trailer brake system provides an improved disc brake assembly with a caliper unit that includes a housing for mounting the pads for relative movement toward and away from the rotor and a cradle with spaced guide pins/tracks for securely supporting the housing at multiple, spaced points. The cradle includes a yoke having spaced arms and a cross piece for embracing the housing, and is independently mounted on a single pivot pin. First and second stops are provided on the bracket for engagement with the cross piece to limit the pivot movement of the caliper unit during vehicle backing and forward movement, respectively. Guide apertures are provided adjacent the distal end of the respective arms of the yoke and include an elastomeric bushing around the guide pins for cushioned in and out movement. The spaced guide tracks on the housing assist in providing axial stability. An elastomeric spring formed integrally with the bushing bodily centers the housing in the axial direction during the non-braking modes and provides added cushion effect. An elastomeric bumper at the first stop urges the caliper unit towards the second stop to prevent pressure release during vehicle forward movement, including in the braking mode. An improved relief valve feeds/exhausts a common transfer line to the cylinder in the housing of the caliper unit.
REFERENCES:
patent: 3365028 (1968-01-01), Hajek
patent: 3746132 (1973-07-01), Jewell, Jr.
patent: 3754623 (1973-08-01), Gatt
patent: 3973655 (1976-08-01), Mollard
patent: 4267903 (1981-05-01), Kita et al.
patent: 4781273 (1988-11-01), Fujinami
patent: 5316110 (1994-05-01), Null
patent: 5411120 (1995-05-01), Null
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