The cause of brake drum damage
Brake drum is the vehicle wheel brake foundation parts, are generally used 14 or 18 gray iron, or malleable cast iron manufacturing. The damage of brake drum is mainly caused by the friction between brake disc and brake drum. Especially when the rivet head of brake friction piece is exposed, or when the brake enters hard materials such as sand grains, the wear of brake drum is more serious. Will wear and tear caused by such hard material around the brake drum groove and strain, brake drum for inner wear more than 424 mm size limit Φ scrap accounts for roughly 30% of the overhaul period, or more. If the vehicle overload and driving on the mountain road, brake drum wear due to frequent use of brake and accelerate, will also appear out of circle, taper and cause early scrap.
Brake drum cracks are caused by the brake drum due to wear and tear over the use of the limit size, and after a number of boring processing, the drum wall becomes thinner, under the action of load stress cracks. When the inner diameter of the brake drum exceeds the limit of use, the vehicle will wade into the water immediately after driving downhill or downhill under heavy load, which will cause sharp shrinkage of the brake drum after high temperature and make the friction surface of the brake drum crack along the axis. It should be pointed out here that: some units in the brake drum, the inner diameter has exceeded the limit size of the use, the brake shoes on the addition of metal plate to increase the thickness of the brake friction sheet continue to use, this is very dangerous.
Each time the secondary maintenance of the vehicle, should remove the brake drum, clean shoes, brake drum, such as cleaning inspection found in the brake drum crack, should be firmly in order to replace.
Brake drum crack, the reason of injury is brake drum material is bad, strength is not enough to cause.