Precautions for rack and pinion transmission

For the rack and pinion transmission with impact load, the following aspects should be paid attention to:

  1. It is better to design it as a modified gear, and it is a negative modified gear. Negative modification will help to improve the bending strength of the tooth root and the impact resistance of the gear.
  2. The heat treatment hardness of the tooth surface is not easy to be too hard. Hrc30 ~ HRC35 can be used. If the tooth surface is too hard, the tooth will crack under impact load.
  3. The quenching depth of the tooth surface is not easy to be too deep, which is generally 1 / 5m ~ 1 / 10m (M: modulus). It is necessary to maintain sufficient toughness of the core material to cushion the external impact load.
  4. On the premise that the structure allows, the modulus m should be slightly larger, which is particularly important for the starting transmission with impact load.
  5. The design speed is not easy to be too high.
  6. The structure shall have enough impact resistance and enough rigidity to ensure the operation of gear rack.
  7. For the selection of bearings, it is recommended to choose sliding bearings instead of rolling bearings. Sliding bearings can have good impact resistance, but they should be well lubricated.
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