The example of gear and rack design introduces the precautions for gear and rack transmission. Interested friends, let's take a look together!

Gears and racks have their own unique motion characteristics during the transmission process: gear transmission is used to transmit the motion and power between any two shafts, with a circumferential speed of up to 300m/s, a transmission power of up to 105KW, and a gear diameter ranging from less than 1mm to more than 150m. It is the most widely used mechanical transmission in modern machinery.

For gear rack and pinion transmissions that begin transmission and have impact loads, the following aspects should be noted:

1. It is best to design it as a modified gear, and it should be a negative modified gear. Negative modification will help improve the bending strength of the tooth root and improve the impact resistance of the gear.

2. The heat treatment hardness of the tooth surface is not easy to be too hard, HRC30~HRC35 is sufficient. If the tooth surface is too hard, it will cause tooth cracking under impact load

3. The quenching depth of the tooth surface is not easy to be too deep, usually 1/5m~1/10mm (m: modulus), and it is necessary to maintain sufficient toughness of the core material to cushion external impact loads

4. If the structure allows, the modulus m should be slightly larger, which is particularly important for starting transmission with impact loads

5. The design speed is not easily too high

6. The structure should have sufficient impact resistance and sufficient stiffness to ensure the operation of gears and racks

7. It is recommended to choose sliding bearings instead of rolling bearings for bearing selection. Sliding bearings can have good impact resistance, but it is important to ensure that they have good lubrication.

The above is the relevant content on precautions for gear and rack transmission. If you have any other questions, please feel free to contact our stable precision machine at any time!