The brake camshaft needs to be replaced when it is seriously worn

The brake camshaft needs to be replaced when it is seriously worn

Under normal circumstances, the brake camshaft part has a fault that the fitting clearance is too large, and it is only necessary to replace the bushing in the bearing hole. However, after the car was disassembled, it was found that there was no trace of grease in the bearing hole, and in addition to the bushing, the brake camshaft itself also suffered serious wear, which is enough to prove that this car has not been filled for a long time. Grease it.

For safety, the bushing and brake camshaft must be replaced. It should be noted here: when replacing the brake camshaft, it is necessary to confirm whether the camshaft is installed incorrectly, because the camshafts on the left and right sides cannot be used universally, and if installed incorrectly, the brake will fail!

In addition, the ball part of the brake shoe also needs to be checked synchronously. If the ball base is worn too much, the brake shoes may wear sideways during braking, resulting in a drop in braking force.

The braking system of a trailer looks simple, but it is actually very complicated. Problems in any small link may lead to huge irreparable losses. Therefore, in daily use, it is necessary to maintain the entire system according to the specified time interval to eliminate the failure in the bud.

Where are the camshafts?

The camshaft of the car is on the upper part of the engine and is mainly used to control the intake and exhaust. In the engine cylinder head, it can be seen by opening the valve cover.

The automobile camshaft adjuster is a cam deflection control valve, which belongs to the angular stroke valve. It is composed of an angular stroke electric actuator and an eccentric hemispherical valve. The actuator adopts an integrated structure, and the electric actuator has a built-in servo system.

Principle: Change the opening time of the intake and exhaust valves according to the working needs of the engine. At high engine loads, the camshaft adjuster is used to optimize the valve overlap angle according to the engine speed in order to supply as much fresh air to the combustion chamber as possible, thereby achieving high power and overlap angle to supply the combustion chamber as much as possible Fresh air for high power and torque.

The common transmission methods between the camshaft and the crankshaft of automobiles include gear transmission, chain transmission and toothed belt transmission. The transmission between the lower camshaft and the middle camshaft and the crankshaft is mostly driven by cylindrical timing gears. Generally, only one pair of gears is needed to drive from the crankshaft to the camshaft. If the diameter of the transmission gear is too large, an additional intermediate gear can be added. Idler. In order to mesh smoothly and reduce working noise, the timing gears are mostly helical gears.