The loader braking system is divided into two forms: gas-cap oil braking and wet braking
Because in the process of frequent advance and retreat and shift, so the brake system wear is more serious, and will produce a lot of heat, gas cap oil brake system, composed of air compressor, gas brake valve, brake clamp, brake disc, low cost, easy maintenance, is widely used.
In the loader with high loaders, working conditions are relatively harsh environment used in the loader, commonly used wet braking form, brake friction plate immersion gear oil, cooling effect is better, strong anti-pollution ability, long life, braking is more safe and reliable, widely used in the world, gradually replace the gas cap braking system. Today's hydraulic wet braking system is mainly composed of the following parts: power pump: general braking system has a separate pump to meet the needs of the whole brake, displacement is generally not large, mostly gear pump. Filling valve: The brake system provides a stable pressure and controls the filling pressure, flow, and diversion of excess hydraulic oil to other systems to ensure the reliability of the brake system. Driving brake valve: the main control system component is the valve. The high-pressure oil of the system enters the pressure after the wheel rim brake, so as to facilitate the control of the brake valve flipping Angle is roughly proportional to the output pressure of the loader. The double-circuit brake valve is adopted. Parking brake valve: For electric or manual on/off valves to provide pressure oil release parking brake. Accumulator: Accumulator that allows the machine to brake shortly after flameout, reducing system filling time. Companies vary their machine configurations to make them more reasonable, but the basic principles are the same. The following brief introduction: in addition to conventional wet braking system, carter in the electric motor and automatic transmission model composite braking system is introduced, the system will be down and in a logical control on the left on the brake pedal, the foot brake valve flip Angle associated with the output of the machine main controller brake pressure, as shown in figure: When the pedal is turned over in zone A, the machine only performs ordinary driving braking, while in zone B, the main controller issues the command to reduce the engine output, and the transmission in zone C automatically cuts off the power output when the gear is in neutral, so as to reduce the axle oil temperature, prolong the service life of the brake, and reduce the use cost. The other is the foot brake valve and electric globe valve switch, when working, the operator will open the switch, brake at the same time through the globe valve cut off the power output of the transmission device, reduce the braking torque, the system reduces the power loss. In normal driving, when the switch is turned off, the brake does not cut off the power output. However, when working in the field, the operator may forget to turn the switch on and off. New braking system: This system is full hydraulic wet braking system, the system has only one foot brake valve, but can realize three kinds of braking, emergency braking and parking braking. The basic working principle is as follows: the pressure oil output from the hydraulic pump passes through the filling valves A and B to the two liquid-filled accumulators, and N to other vehicles to other systems. The foot brake valve in AB is located between the limit device and a small touch switch at point B. When braking, press the brake pedal, and the high-pressure oil accumulator enters the wet braking of the front and rear axle to realize the braking, brake valve Angle, pressure output and control within the range of 0-A; And emergency braking, the operator will step on the pedal, flip the pedal, pedal compression limit spring to overcome the control of point A, brake valve travel to point B, touch the switch closed, signal E through the whole controller so that the pressure in the transmission system is temporarily zero, and cut off the power output. When the foot brake valve is released, touch the switch to close, the pressure in the transmission system to return to normal, enhance the braking effect. Parking brake, and cut the power output. When the vehicle is driving or working on the ramp, the option to cut off the dynamic braking is avoided due to the presence of boost and feedback to the manipulator, so that instability such as "landslide" does not occur. Start.
