The difference between the spiral bevel gear box and the quasi bevel gear

The spiral bevel gear and the quasi double bevel gear are the transmission modes of the main reducer of the car. What's the difference between them?

Spiral bevel gear as shown in Figure 2 (a) shows that the driving gear and driven gear axis intersect at one point, angle can be arbitrary, but in the vast majority of automobile driving bridge and deceleration gear pair made of angle of 90 DEG with the vertical arrangement. Due to the effect of transverse tooth overlapping, at least more than two pairs of meshing at the same time. Therefore, the spiral bevel gear can bear larger load, coupled with the teeth are not in the whole long tooth engagement, but gradually from one end of the tooth is continuous steering at the other end, making the work smooth, even when running at high speed, noise and vibration is very small the.

As shown in Figure 2 (b), the main and driven gear axis of the gear is not intersecting, and the space intersection angle is more than 90 degrees. The driving gear shaft has an upward or downward offset (corresponding to an upper offset or lower offset) with respect to the driven gear shaft. When the offset to a certain extent, can make a gear shaft from another gear through paraxial. So you can in each gear is arranged on both sides of the compact size of bearing, to enhance the support stiffness, ensure the correct tooth engagement, so as to improve the service life of the gear is very beneficial, it is used to link type drive axle.

With the spiral bevel gear due to intersect the gear axis is the winner, a driven gear helix angle is equal to the different quasi hypoid gear pair axis offset makes the active gear helix angle is greater than the helix angle of the driven gear. Therefore, the hypoid bevel gears to the normal module is equal, but the end module is different (end module end module of the driving gear is larger than the driven gear). This makes the driving gear drive quasi double cone gear ratio gear of spiral bevel gear transmission of the corresponding larger diameter and better strength and stiffness. In addition, due to the quasi hypoid gear transmission driving gear and the diameter of the helix angle larger, so that the tooth surface contact force is reduced, and the service life is improved.

But the transmission is small, the driving gear transmission quasi double cone gear relative to the driving gear of spiral bevel gear is too large, then the selection of spiral bevel gear is more reasonable.