| 摘要 |
A drum brake having brake tongs 12 comprising arms 121, 122 actuated by a ram 14. Between arms 121, 122 there is arranged device 3 provided with a bore 31 and with a slideway 32 the extent "h" of which makes it possible to select the necessary play between the brake lining 131 and the drum 11. A mobile element 34 connected to one of the arms 122 of the brake tongs slides with friction in the bore 31. Slideable without friction in the slideway 32 is a stud 33 connected to the other arm 121 of the tongs 12. The friction force of the mobile element 34 in the bore 31 is greater than the force produced by the opening spring 15 of the linings 131, 132, but less than the force produced by the ram 14 which closes the linings 131, 132 on the drum 11. The travel "h" of the stud in the slideway determines the play between the linings 131, 132 and the drum 11 in order to obviate licking of the linings on the drum. In an alternative embodiment (Fig. 2, not shown) the friction force is in the arm pivot (123) and a stud (53) and slot (52) provides the travel "h". <IMAGE> |
