what is thrust load?

Question

Helical gears create thurst load when they first mesh, and this problem apparently can be supported by using a bearing. But i don't know what thrust load actually is...

Answer 1

THRUST load is load parallel to the shaft of the gear. It is produced by helical gears because the helix angle, not the pressure angle. It is not produced by spur gears, which have straight teeth that are parallel to the shaft axis.

RADIAL load is the load that tends to separate the gears. It acts perpendicular to the shaft. This is what is produced by the pressure angle. Both spur gears and helical gears produce this kind of load.

Spur gears do not have any substantial thrust load, but they are noisy. Helical gears, by comparison, can be much quieter and potentially longer-lived, but they are more expensive to manufacture and you must provide thrust bearings to handle the substantial thrust load.

For extremely demanding applications, double-helical gears can be used, with the teeth forming a herringbone pattern. However, these have a high penalty in cost and limited performance advantage over helical gear sets, aside from the cancellation of thrust load.

Answer 2

Thrust Load

Answer 3

When the gears mesh the angle of the teeth create thrust load, pushing the gear against the housing. The best thrust load bearing is a Kings-berry, it can handle more thrust load than any other bearing known. In layman's terms, thrust load is when one object pushes on another, forcing it to move.

Answer 4

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RE:
what is thrust load?
Helical gears create thurst load when they first mesh, and this problem apparently can be supported by using a bearing. But i don't know what thrust load actually is...

Answer 5

In all gearing, torque is generated by the engagement of the teeth; this is how power is transmitted.

But the teeth do not engage tangentially to the pitch circle, but at an angle. That angle is called a pressure angle.

Thrust load is the component of the pressure angle that is acting towards the center of the gear. This is a force generated by the gears that tends to want to separate the gears as they transmit torque. When designing a gear train, these forces must be supported by axle sizes and bearing mounts in addition to any other reactionary forces.

A common pressure angle for spur gears is 21°.

Answer 6

The distributor gear that is driven by the camshaft applies a thrust load. The installation of an inexpensive thrust button on the end of the camshaft will help alleviate this problem.

Answer 7

If you have to choose a bearing, keep in mind that some are for axial loads, other for trust load (sideway) and some for both (angular trust). The bearing might fails way faster than it should if not used in the right situation.