Bevel gears and spur gears are common mechanical transmission components, and they have some differences in gear shape and working principle. The following are the differences between bevel gears and spur gears:
1. Tooth structure: The tooth shape of the bevel gear is curved, similar to the umbrella shape, while the tooth shape of the spur gear is straight. The bevel gear has a larger tooth surface angle, therefore it has a larger tooth surface width and better shares the load.
2. Working principle: The bevel gear is engaged by two bevel gears and transmits power to the other bevel gear through rotational motion. Straight gears transmit power to downstream shafts through the engagement of direct gears and gears.
3. Stress characteristics: The bevel gear has a larger tooth contact area, so it can withstand larger loads and torques. The contact area of the tooth surface of spur gears is relatively small, and the bearing force is relatively low.
4. Noise and vibration: The tooth surface distribution of the bevel gear is relatively uniform, and the noise and vibration during operation are relatively small. However, spur gears may produce some noise and vibration due to the large tooth surface clearance.
5. Installation requirements: Due to higher accuracy requirements for bevel gears, the manufacturing and installation requirements are also relatively high. The manufacturing and installation of spur gears are relatively simple.
It should be noted that bevel gears have a certain degree of complexity in manufacturing due to their special tooth shape structure, so the cost is usually high. And spur gear is a common and economical transmission method, which is widely used.
The choice of bevel gear or spur gear should be determined based on specific application requirements. Bevel gears are suitable for transmission systems that withstand large loads and high torques, and require lower noise and vibration. And spur gears are suitable for general transmission systems, with lower costs and simpler use.