| 摘要 |
1,119,207. Disc brake. DUNLOP CO. Ltd. 3 Sept., 1965 [23 Sept., 1964], No. 38730/64. Heading F2E. A disc brake comprises an annulus 5 secured at its outer edge to a rotatable spider 2, aligned friction elements 6, 7 on either side of the disc slidably supported on pins 9 mounted on a non- rotatable support 10, 11, a tie rod 22 adjacent the inner periphery of the disc and connected to one friction element 6, and brake operating means of the ball and ramp type associated with the second friction element and the tie rod. After operation of the brake the pads are returned by springs, some of which are disposed within the guide pins 9. The friction elements each comprise a pressure plate to which three friction pad assemblies are detachably secured by the heads of bolts 14 (Fig. 1, not shown). On removal of the bolts the pads may be removed radially through a gap in the spider 2. The rotatable thrust plate 28 of the ball and ramp type actuator may be rotated directly by a lever or, as shown, by a tubular member 35 rotatable by a splined shaft 38. Wear adjustment.-A reaction member 41 is disposed between the plate 28 and an adjustment member 42 formed by a nut engaging a left-hand thread on the tie rod. A roller race 43 and a friction ring 44 are disposed on the faces of the member 41 and a spring clutch 48 surrounds a cylindrical surface 49 of the adjustment member 42, the end 50 of the spring engaging loosely in a notch 51 in member 35. For normal clearance, the rotation of the hollow shaft 35 is insufficient to move the spring, but if the clearance is excessive the spring 48 is moved around the surface 49 to a new position as the brake is applied. On release thereof the return motion of the hollow shaft 35, the opposite end of the notch 51 abuts the end 50 of the spring which then carries the nut 42 around to draw the tie rod therethrough and reduce the clearance. The nut can be manually adjusted when the cover 45 has been removed. The adjustment member may alternatively be provided with a manually releasable locking device such as a plunger on the reaction member engaging serrations on the adjustment member. |
