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Loader commonly used full hydraulic wet brake valve system
Loader conditions relatively harsh, because in the process of frequent advance and retreat and shift gear, so the brake system wear and tear more serious, and there will be a lot of heat generation, gas cap oil brake system because of hair Heat, so in the plateau region need another set of water cooling system, and full hydraulic wet brake system is immersed in the friction plate friction gear oil, cooling better, anti-pollution ability, long life, braking more secure Reliable, widely used in the world, and gradually replace the gas-top brake system. Today's hydraulic wet brake system mostly consists of the following components: Power Pump: The general brake system has a separate pump to meet the needs of the whole brake, the displacement is generally not large, mostly gear pumps. Filling valve: The brake system to provide a stable pressure, and control the filling pressure, flow, the excess hydraulic oil diversion to other systems to ensure the reliability of the braking system. Service brake valve: The main control system components, for the valve, the system of high-pressure oil after the pressure into the wheel rim brake, in order to facilitate the manipulation of brake valve flip angle and output pressure is approximately proportional to the loader are used Is a double circuit brake valve. Parking brake valve: for electric or manual on-off valve, providing pressure oil to release the parking brake. Accumulator: Accumulator, so that the machine can still be braked shortly after the flameout, and reduce the system of liquid filling time. Various companies according to their own machine configuration to make different improvements to make it more reasonable, but the basic principles are the same. The following is a brief introduction: In addition to the conventional wet brake system, Carter introduced in its electronic control motor and automatic transmission model composite brake system, the system will downshift and the control of the median Logic is focused on the left brake pedal, so that the foot brake valve flip angle and the output brake pressure associated with the main controller of the machine, as shown: When the pedal flip in the A zone, the machine is only carried out Ordinary service brake, and in the B zone when the main controller issued a command to reduce the engine output, C zone gearbox automatically when the gear position neutral, cut off the power output, thereby reducing the axle oil temperature and prolong the service life of the brake, Reduce the cost of use. The other is the foot brake valve plus electric power cut-off valve switch, when the work, the operator will open the switch, brake at the same time cut off the transmission through the cut-off valve power output, reducing braking torque, the system reduces Power loss. In normal traffic when the switch is turned off, the brake does not cut off the power output. However, when working on site, operators may forget to turn the switch on and out of effect. A new brake system: The system is a full hydraulic wet brake system, the system has only one foot brake valve, but can achieve service brake, emergency brake and parking brake three cases. The basic working principle is as follows: the pressure oil output by the hydraulic pump through the filling valve A, B to the two accumulators filled with liquid, N to other vehicles to other systems. Foot brake valve in the a-b between the limit device and a little touch switch at point b. When the service brake, depress the brake pedal, high pressure oil accumulator into the front and rear axle wet brakes to achieve braking, brake valve angle, pressure output and control in the 0-a range; and urgent Brake, the operator will step up efforts to step on the pedals, flip pedals, pedal compression limit spring to overcome a point of control force, the brake valve stroke reaches point b, the touch switch is closed, the signal E to pass The whole controller makes the pressure in the transmission system temporarily zero and cut off the power output. When the foot brake valve is released, the touch switch is turned off and the pressure in the transmission system is restored to normal to enhance the braking effect. The parking brake, but also cut off the power output. When the vehicle is driving or working on the ramp, due to the presence of a step-up and feedback to the manipulator, it avoids the option to cut off the dynamic brakes so that there will be no instability such as "slippery slope" during starting.