| 摘要 |
952,612. Disc brakes. DUNLOP RUBBER CO. Ltd. Aug. 16, 1960 [Aug. 29, 1959], No. 29570/59. Headings F2E and F2F. Disc brakes have a pair of pressure-plates 12 each carrying a friction pad 13 and mounted for pivotal movement about a first centre and a second centre, so that upon application of the brakes the pressure-plates 12 are moved about their first centre to close the pads 13 on to the disc 10 and then abut their second centre to complete engagement, the mechanism providing for progressive adjustment for wear. The pressure-plates 12 are pivoted by pins 33 to toggle links 30 pivoted on a pin 31 movable in slots 32 in upper and lower plates 23, 24 and extending through a push-rod connecting a pilot piston in cylinder 29 with a spring-loaded plunger in a casing 26. The pressure-plates are suspended by front and rear supports 15, 16, the former having a universal joint at the bottom which includes the pivot 17. Pressure fluid is forced from a master cylinder to the pilot cylinder 29 so that its piston moves back to straighten the toggling 30 and part the pressure-plate ends with the result that the plates pivot about the pivot 17 to engage the pads 13 with the disc 10. Rearward movement of the pilot piston unmasks an opening 37 through which fluid passes along a pipe 38 to a main cylinder 40 pivoted to one pressure plate, its piston 42 being connected by a rod 43 to the other pressure plate, so that the plates pivot about their pins 33 to engage the pads 13 firmly with the disc 10. When the brake pressure is released, the piston 42 moves sufficiently to disengage the pads and the movement is completed by rotation about pivot 17, consequently pivots 17 approach each other as wear of the pad occurs. |
