Patent GB-1181086-A (GB)
Title: Improved Disk Brake
IPC: F16D55/226
Filed: 1967-11-22
Abstract: 1,181,086. Disc brakes. KELSEY-HAYES CO. 22 Nov., 1967 [28 Dec., 1966], No. 53229/67. Heading F2E. In a spot-type disc brake having a caliper 47 (Figs. 1, 4) there is provided a stationary torque plate 41, 46 which allows movement of the caliper in a direction perpendicular to the plane of the disc and restrains it against rotation or twist when brake pads are applied to the disc, and ensures even wear of the pads. As shown, Fig. 4, a brake disc 21 is secured to a hub 13 rotatable on a stationary wheel spindle 15, a wheel 29 being attached to a flange 25 on the hub. The torque plate 41 (detailed in Fig. 2) having two legs 71, 73 extending from a main body portion 46, is secured to a support 42 formed integrally with the wheel spindle 15. A "C"-shaped caliper 47 has legs 55, 57 embracing the disc 21, the leg 55 carrying a fluid motor 61 having a piston 63 slidable in a bore 67 formed in the leg. The piston is engageable with a backing plate 77 to which is riveted a lining 79, and the leg 57 acts as a reaction member engageable with the other brake pad backing plate 85 carrying a lining 83. The backing plates are slidingly supported on a pair of parallel pins 87, 89 (Fig. 1) carried between flanges 91, 95 and 93, 97, respectively, formed on the caliper legs. The backing plates have elongated holes (Fig. 5, not shown) to accommodate the pins, which restricts movement of the brake pads in a radial direction with respect to the spindle 15 axis and allows limited movement in a direction perpendicular thereto. As shown in Fig. 7, the pin 89 passes through a resilient grommet 107 in the flange 93 of the caliper, through back-plates 121, 129, is fixed to the torque plate leg 71 by screw-threads, and passes through'a resilient grommet 107 in the flange 93. The other pin 87 is similarly arranged. The grommets 107, 109 together with a resilient 0-ring 233 on the piston, act to return the piston after a brake application. (Specification 1,181,085). Preventing caliper twist.-The torque plate carries two studs (141), (143), (Figs. 6, 9 and 10, not shown), one in each leg, with square section shanks projecting from the plate and disposed one stud against each of two edges of the backing plate 77 of pad 75 to absorb braking torque. The braking torque of the other pad 81 is transferred to the reaction portion 57 of the caliper at abutting surfaces 181, 185, and 183, 187 on the brake plate 85 and caliper arm, respectively. The resulting twisting couple tending to twist the caliper with respect to the torque plate is prevented by flanges 191, 193 (Fig. 1) on the torque plate which engage complementary surfaces or shoulders 209, 211 on the caliper. A flexible strap 155 (Fig. 1) with generally U-shaped ends, is fixed between the torque plate legs 71, 73 by the studs and is bolted to the caliper leg 55 by screws 163, 165 allowing the caliper to move during braking, in a direction perpendicular to the plane of the disc 21 while resisting movement in other directions. The torque plate also has shoulders which engage ears on the brake pads when the linings become worn, to prevent cocking or binding. Specifications 1,093,036 and 1,181,085 are referred to.