Most of the internal force wheel brake pump booster pump gas booster, at present most of the loader used in the XM-60-type pump structure shown in Figure 1, the disadvantage is that the oil Brake fluid in the cup will fluctuate greatly during braking and releasing of the vehicle. When the cylinder piston rod to promote the hydraulic cylinder piston forward movement, the brake fluid in the oil cup will continue to flow down to supplement the piston forward movement in the space formed later. On the other hand, when the piston of the hydraulic cylinder returns, the space at the rear of the hydraulic cylinder is sharply compressed again. The brake fluid that has previously flowed into the cylinder is forcibly returned to the oil cup, which inevitably causes the fluctuation of the brake fluid and bubbles. The more times you flip, the more bubbles you create. That force pump continuous work longer, its bubble will be more, so there is a lot of brake fluid in the gas. As the bubble increases, the pressure on the hydraulic system drops and the reliability of the brake decreases. Because the brake fluid in the vehicle brake and brake will have a significant brake fluctuations, the upper part of the oil cup air volume changes, in order to eliminate the pressure changes caused by changes in air volume, the oil cups often have vents, which Will also allow dust to enter, resulting in brake fluid pollution. Therefore, this force pump after a certain period of time, the brake system must be promptly ruled out the air or replace the brake fluid, otherwise it will cause the brake failure, and even lead to safety incidents: Many domestic pump manufacturers have had Afterburner pump has been improved, in which the more perfect technology structure of the bottom of the oil cup has two through holes, respectively, leading to the hydraulic cylinder piston front and central oil chamber, so when the cylinder piston to promote hydraulic cylinder piston forward movement, two Holes are connected to the middle of the hydraulic cylinder piston into the oil chamber, as the oil into the chamber before the start of work has been filled with brake fluid, and work in the oil chamber and no volume change, so the hydraulic cylinder piston outside the two parts movement , Will not cause the oil cup flip up and down within the brake fluid, which will not produce bubbles Hydraulic cylinder piston movement between the two holes, the oil chamber volume will be slightly changed, will cause the oil cup slightly fluctuating oil surface ; The same time, the oil cup sealed structure to prevent dust in the air into the oil, effectively maintaining the brake fluid cleanliness. Installed test proved that the original force pump brake fluid replacement period doubled. Chongqing Huipu Hydraulic Power Manufacturing Co., Ltd. on the basis of this further made improvements, the so-called optimization of Canadian pump this type of oil pump at the bottom of a single-way valve. When the cylinder piston to promote hydraulic cylinder piston forward movement, because the charge chamber and the working oil chamber is not connected, so the hydraulic cylinder piston throughout the reciprocating motion will not cause the oil cup flip up and down, and therefore will not produce bubble. Later, the hydraulic cylinder piston seal from passive seal to static seal, to further improve the reliability of the force pump. The new optimized gassing pump gas chamber part of the diaphragm (see Figure 4), effectively eliminating the manufacturing errors caused by cylinder piston and cylinder piston axis problem. Bench tests show that the reliability of the force pump increased from 350,000 to 650,000. XCMG Chongqing Construction Machinery Co., Ltd. has optimized the type of force pump in LW321F, LW521F host installed on the test. The improved afterburner pump to make XCMG loader more adapt to the requirements of the mountain brake frequency