The ATV's gear system is an important part of the vehicle's transmission, responsible for transmitting the power generated by the engine to the wheels, enabling the vehicle to move forward or backward. Here are a few key points about ATV gears:

1. Gear type: The gear usually used by ATV can be divided into straight gear, helical gear and spiral gear. The designs and uses of these gears vary, but their purpose is to transfer power from one shaft to another.

2. The difference between forward gear and reverse gear:

Gear itself: The gear itself is not fundamentally different between reverse and forward gear.

Engagement mode: The gear meshing mode of forward gear and reverse gear is different, which is mainly reflected in the arrangement and combination of gears.

Output shaft speed direction: In the case of the same input shaft speed, the output shaft speed direction of the forward and reverse gears is opposite. This is achieved through different arrangements of gears inside the transmission.

3. Transmission design: The transmission contains multiple sets of gears, which are combined in a specific arrangement to achieve different transmission ratios. Gears for forward and reverse gears are usually switched by a specific clutch or synchronizer.

4. Materials and manufacturing of gears: Since ATVs usually operate in harsh environments, their gears are usually made of wear-resistant materials and specially treated to improve durability and reliability.

5. Maintenance and replacement: The gear of the ATV may be worn or damaged after a long time of use, so it needs to be maintained and replaced regularly. Proper maintenance can extend the service life of the gear and reduce failure and repair costs.

In short, the ATV's gear system is carefully designed to ensure smooth and efficient operation of the vehicle under different driving conditions. When understanding and maintaining gear systems, it is important to understand the differences between forward and reverse gears and how they work.