The use of gears is generally not a single use, it is often a combination of multiple gears or gears and racks or with other parts.The combination criterion is determined according to factors such as the size, type, transmission ratio, and rotation direction of the gear.What are the transmission combinations between commonly used gears?

1. Cylindrical gear drive: used for paired gears with parallel shafts.The steering of the driving wheel driven manually or by a motor is opposite to the steering of the driven wheel meshing with it. To make the two gears rotate in the same direction, an idle gear can be added between the two gears.

2. Bevel gear transmission: Use a combination of two bevel gears, so that the rotation direction between the two gear shafts can be changed by 90 degrees.

3. Worm drive: In the combination of worm and gear, the worm is the original moving part for deceleration transmission.When the reverse stroke cannot be self-locked, we can use the worm gear as the original moving part for speed-increasing motion.When in use, the rotation direction of the two shafts is changed by 90 degrees, and linear motion can also be obtained on the worm.

4. Rack and pinion transmission: The combination of pinion and pinion is a combination that can transform rotary motion into linear motion.

5. Ratchet wheel and pawl: The ratchet wheel is a gear with a pawl. The pawl is a key between the teeth of the gear to prevent the gear from reversing.

6. Cam: Refers to a non-circular rotating wheel that is used to repeatedly push the object it first touches through movement.

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