The old model pump uses a pair of bevel gear drive, there are three sets of shaft support up and down, a total of more than 60 parts, complex structure, manufacturing difficulties, high cost, more failures. We refer to the design principle of foreign tractor guide wheel, switch to a thrust bearing for support, with a pair of good technology, high strength trapezoidal screw, nut drive. Become a small number of parts, simple structure, safe, reliable, low failure rate of the parts. Drag the pump shape. The main steering wheel components using a pair of trapezoidal screw, nut drive. Trapezoidal thread with root strength, good technology, good thread on the neutral. The main disadvantage is inefficiency, but it does not affect the job. Screw made of 45 steel, tempered HB220 ~ 250. Nuts QSn7 a 0.2 tin bronze overall system. The guide wheel is composed of an axle 1, a bushing 2, a wheel 3, a wheel carrier 4, a pin 5, an inner cylinder 6, an outer cylinder 7, a screw shaft 8, a nut 9, a bearing 10, a felt ring 11 and a crank 12. Taking into account the guide wheel slip screw drive, sliding screw failure forms, mainly thread wear. Therefore, screw, nut design is based on wear resistance. In addition, the screw and nut are force-transmitting spirals, and the strength of the dangerous cross-section of the screw and the shear and flexural strength of the screw and nut threads should be checked. The guide wheel is positioned by the outer cylinder 7, and the installation dimension H of the mounting plate on the outer cylinder 7 is changed according to various types of tow pumps. Inner tube 6 and nut 9 with M58XI. 5 screw connection and then screwed together into one. When the crank handle 12 is rotated, the driving nut 9 rotates together with the inner cylinder 6. When the wheel 3 and the ground contact with the rotary motion of the inner cylinder 6 will become a linear motion, so that the second half of the drag truck jacking up. Similarly, the second half of the vehicle can also be put down. The screw shaft 8 is supported by the thrust bearing 10 in the outer cylinder 7. The lower part of the inner cylinder 6 is welded to a shaft head with a hole. The shaft head at the lower part of the inner cylinder 6 is connected with the wheel carrier 4 through the axle 1. The wheel carrier 4 is likewise connected to the wheel 3 via the axle 1 and the bushing 2. In this way, through the pin 5, the inner cylinder 6 under the shaft head holes and different positions on the wheel frame 4 through-hole assembly together, you can achieve the wheel of â… , â…¡, â…¢ three states, the completion of three Kind of function Between the wheel 3 and the axle 1 is connected with an oil-filled bush 2 to ensure long-term stability of the wheel 3.
