The function of the brake wheel cylinder is to convert the hydraulic pressure into the mechanical thrust of the brake shoe opening. There are two types of brake wheel cylinders, single-piston type and double-piston type. Single live
Plug brake wheel cylinders are mainly used for double lead shoe and double follower brakes, while double piston brake wheel cylinders are widely used and can be used for lead shoe brakes.
It can also be used for two-way double-lead-shoe brakes and self-energizing brakes.
Figure 4-13 shows the structure diagram of the double-piston brake wheel cylinder. Two pistons are installed in the cylinder, and two cups are installed on the end faces of the two pistons to realize
The oil chamber is sealed. The inner side of the piston is hemispherical in order to maintain the oil inlet gap between the two pistons (the bomb can also be used to maintain the oil inlet space between the two pistons
Gap). In addition to dustproof, the protective cover can also prevent moisture from entering, so as to prevent the piston and cylinder from getting stuck due to rust. When braking, the braking from the master cylinder
The fluid enters the oil chamber between the two pistons through the oil inlet pipe joint and the oil inlet hole, pushes the piston outwards, and pushes the brake shoe through the ejector rod.
Figure 4-13 Schematic diagram of double-piston brake wheel cylinder structure