In the assembled structure, the two halves of the herringbone gears are respectively hobbed, and then connected by hinge bolts (for the pinion gears, the interference connection or the key connection), which is the assembled structure. Compared with the structure with the undercut, the only drawback is that the accuracy of the tooth contact is reduced due to the extra assembly. In the form of assembled gears, the two-half herringbone gears are separately machined. For a single gear, the machining accuracy is the same as that of the above-mentioned undercut slotted gear. The alignment accuracy of the two halves of the herringbone teeth can be ensured by adopting corresponding measures in the process. However, the toothed end of the machined gear has a misalignment error after assembly. Therefore, the tooth misalignment is increased by one step compared to the overall herringbone gear.
The machining accuracy of the gears of the three designs can actually be achieved. Gear actual machining accuracy design scheme processing accuracy without backing groove with undercutting groove assembly tooth shape error, base section error, tooth direction error, gear strength calculation analysis of three design manufacturing schemes according to the working characteristics of drilling mud pump and we understand According to the situation analysis, the main failure mode of the transmission gear is the tooth surface pitting, and only a few gears have gear teeth broken. There is no mature calculation method for abrasive wear. Therefore, this paper mainly calculates the bearing capacity of the gear according to the gear contact fatigue calculation method and estimates the working life of the gear. For gear bending strength, only strength check calculations are made.
For the above three design and manufacturing schemes, the gear strength calculations are respectively carried out, so that the safety factor of one of the schemes is the largest, and the bearing capacity is high. Table 4 lists the contact strength calculation safety factor SH and the bending strength calculation safety factor SF for the three design manufacturing solutions. There is no undercut groove herringbone gear tooth machining, and the contact strength of the gear teeth is calculated by the safety factor SH and the bending strength is calculated as the safety factor SF.
According to the life factor, the test gear contact fatigue limit stress of RcHlim and RHlim in the ZN=RcHlim/RHlim formula is finite and infinite life, respectively. Since ZN, RcHlim and RHlim are independent of other calculation parameters, the finite life coefficient calculation formula ZN=ScH/SH can be derived. The safety factor of ScH is finite life, ScH=SHmin=0.85, and SH is the safety factor for infinite life. , FO1300 drilling pump herringbone gear design and manufacturing program decision analysis.
See the calculation results of the gear working life of the three schemes. The table uses the following formula to calculate Nt=109/Z1/0.057N (107
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