Patent GB-1026516-A (GB)
Title: Improvements in or relating to disk brakes
IPC: F16D65/847
Filed: 1963-04-04
Abstract: 1,026,516. Disc brakes. DAYTON STEEL FOUNDRY CO. April 4, 1963 [April 5, 1962] No. 13418/63. Heading F2E. A disc brake comprises an annular disc 20 adapted for connection to a rotatable wheel 14, a torque member 25 adapted for connection to a fixed axle 12, splines 30 formed on the torque member and a pair of pressure plates 31, 32, slidably mounted on the splines for engagement with the disc. The disc 20 and pressure plates 31, 32 are removable as a unit from the axle leaving the torque member in place on the axle by sliding axially on the splines 30. As shown, each pressure plate has secured thereto four pads 36 of friction material having backing plates 37, Fig. 6 (not shown) keyed at 38 in slots formed in the plates 31, 32. Combined sleeve bearing means and retraction spring positioning means are interposed between spline keys 30 on the torque member 25 and the co-operating slots 33 in the pressure plates and consist of channel shaped bronze plate sleeves 40. Each sleeve has an outwardly extending torque portion which is slotted to receive the tab 43 of an anchoring clip 45, that is in turn slotted to provide limited axial movement under the bolt 48. An upright 50 is spot welded to each sleeve 40 and supports a pin 51 the ends of which position retraction springs 55, 56, the latter being partly received in recesses 53 in the pressure plates. The brake can be aligned by clamping the pressure plates against the disc and then tightening bolts 48 which correctly position the uprights 50. The plates 31, 32 are applied against the disc 20 by a diaphragm air or hydraulic motor 60 which includes a push rod 61 connected through a clevis pin 63 to the pressure plate 31. A pair of actuating arms 70, 71 which are connected to the actuator body at one end, bear at the other end through thrust links 80 pivoted at 79 thereto against the pressure plate 31. The ends 85 of the links 80 are received in cup- or U-shaped bosses 88, 89 formed on the plate 31. The pressure plate 32 is connected to the arms 70, 71 by draw bolts 95, 96 which are guided axially in plate 31 by bushings 99. The bolts 95, 96, Fig. 6 (not shown), are connected to the arms 70, 71 by a roller bushing 100 which has transverse pintles 101, 102 received within a bifurcated yoke 105 formed on each of the arms and are screwthreaded into the plate 32 so as to permit adjustment to compensate for wear of the friction pads, the bolts being locked in position by a wire retaining clip 115. The links 80, 81 are held in engagement with the plate 31 by retraction springs 55, 56; however, an auxiliary spring 109 may also be employed. The disc 20 is formed of two braking plates 130, 131 of cast iron between which is disposed aluminium which extends integrally therefrom to form a continuous annular web 135 for heat conduction into atmosphere. A water retaining groove 136 is cast or machined in the web 135 and provides water vaporization cooling means. Water is provided by a pipe 138 and is held in the groove 136 by centrifugal force. In a modification the links 80, 81 are replaced by rollers which coact with cams formed on the plate 31.