A parallel helical gearbox is a type of mechanical transmission system where the input and output shafts are arranged in parallel, and the gears used are helical in shape. Helical gears have angled teeth that engage gradually, providing smoother and quieter operation compared to spur gears. This gearbox is known for its high efficiency, load-carrying capacity, and durability, making it suitable for applications involving high torque and continuous operation, such as conveyors, crushers, and heavy-duty machinery. The parallel shaft design also allows for compact installation and easy alignment in industrial setups.