Patent ID: 8215460

Claim:
An automatic slack for automobile comprising: a casing ( 1 ); a control arm ( 2 ) connected with the casing ( 1 ); a worm gear ( 3 ); a worm ( 4 ) which is engaged with the former and are installed inside of the casing ( 1 ), a ring gear ( 5 ) fixed on the control arm ( 2 ); a one-way clutch device connected with the worm ( 4 ) in the casing ( 1 ); a clutch control device of the one-way clutch, wherein the said control device comprises a pinion ( 15 ) engaged with the ring gear ( 5 ) and connected with the casing ( 1 ); a small skew gear ( 16 ) connected with the one-way clutch device, the small skew gear ( 16 ) being connected with the casing ( 1 ) by axially sliding, the pinion ( 15 ) being circumferentially fixed, by axially sliding and connected with the small skew gear ( 16 ); an adjusting nut ( 17 ) fitted on the casing ( 1 ) to restrict and adjust the sliding distance of the small skew gear ( 16 ); a setting bolt spring ( 18 ) on the small skew gear ( 16 ) to allow the small skew gear ( 16 ) to return to its position so as to maintain a pre-set clearance to the adjusting nut ( 17 ); an adjusting hole ( 23 ) on the casing ( 1 ), one end of the adjusting nut ( 17 ) being in the adjusting hole ( 23 ) and being connected by thread with the adjusting hole ( 23 ) , and the other end of the adjusting hole being extended out toward the direction of the small skew gear ( 16 ); the adjusting nut ( 17 ) being of cylindrical shape; and an arbor ( 22 ), one end of which is inserted in the adjusting nut ( 17 ).