In our life, if you have a certain amount of research on the car, you should all know that most of the car transmissions we usually drive are helical gears, so why are the car transmissions used in helical gears?
First of all, we know that forward gear is the most used gear of a car. Using helical gear can not only ensure sufficient strength, but also make it more quiet and comfortable. So the car gearbox basically uses helical gear. Helical gears have higher bearing capacity and less noise and vibration than spur gears.
Spur gears are engaged and disengaged at the same time, advancing and retreating at the same time, which will lead to great noise and vibration of power transmission. Moreover, the number and area of teeth engaged at the same time in spur gear transmission is limited, which is not as large as helical gear. In addition, if you want to transfer more torque, you need larger teeth, and with larger teeth, the volume of gear will be larger. But the advantage of spur gears is that they can engage and disengage freely in the horizontal direction, and many reverse gears are directly engaged by spur gears. This eliminates the need for a combination jacket, reduces cost and weight, and results in a gearbox that hums when reversing. In the process of meshing, each tooth of helical gear gradually completes all meshing from a point. The meshing process is smooth, the noise is small and the vibration is small, and the meshing area is larger and the bearing capacity is larger in the transmission process.