Package Constraints in Right Angle Gearboxes

When requests for right angle gearboxes come into Rj Link with tight space constraints, the engineering team needs to determine the mounting distance and check for backlash constraints. The data is reviewed using sophisticated gear design and development software to come up with a package size that can handle the minimum and maximum operating parameters. A gear set is developed to get a general package size to help determine the mounting distance.   Based on the operating conditions it can also be determined what an acceptable amount of backlash will be for the system.

Parameters Used in Installation of Bevel Gearing:

• Always have a matched set of gears, a driver and a driven gear
• Gears need to be a close fit on the shaft, and not loose bouncing around
• Always check backlash
• Check tooth bearing (contact pattern)
• Once assembled, the lock nuts and bolts, etc. are tightened
• The pinion and the gear need be locked against axial thrust in both directions
• Gears need to be properly lubricated before operating under any power

Determining Mounting Distance:

This is the axial position of the bevel gear and pinion in the assembly, which is a given dimension from the pitch apex and a linear dimension from the axial center point. This surface is usually to the back face of the pinion or the gear.

Determining Acceptable Backlash:

Bevel gears have a certain amount of backlash cut into them. This is based on pitch and operating conditions.

Inadequate Backlash:

• Too much backlash will give you vibration, pulsation, and poor contact ratio. The gears won’t come into contact soon enough, and will add to noise and premature failure.
• Too little backlash will give you noise, and the gears will wear excessively. You will see scoring and damage to the teeth.  The gear meshes tight, it binds a little bit, and will give you some interference.