Toleracing of center distance with internal gear

In summary, the poster is seeking help with choosing the tolerancing grade of center distance for internal gears they ordered. The gears have a center distance of C=331.494mm and a module of m=10. The bearing has 79 teeth and a pitch diameter of 790mm, while the pinion has 13 teeth and a pitch diameter of 130mm. The poster is looking for guidance on which standard or formula to use for calculating the tolerancing grade, with the additional note that the pitch diameters should be tangential when laying out the centers for the bearings and shafts.
  • #1
cherish
20
3
Hi all,
first to say sorry if the question is repeated second time
I've order a couple of internal gears from Rollix as picture below:
[PLAIN]http://img155.imageshack.us/img155/5996/centerdistance2.jpg
The calculation from them for internal gears with center distance C=331.494 (mm)
Backslash at center distance maxi: 0.98 (mm)
Backslash at center distance mini: 0.53 (mm)
module of bearing & pinion: m=10
number of teeth: bearing=79, pinion=13
pitch dia: bearing= 790, pinion=130
...
The trouble now I'm facing is chosing tolerancing grade of center distance on bores to fit with shaft of pinion & bearing, more illustration on picture below:
[PLAIN]http://img293.imageshack.us/img293/3594/74496622.jpg
Does anyone know which of standard can be used to look up or formula to calculate the tolerancing grade of center distance in this case pls give me a help :redface:
Thanks a lot for your reading this asking
 
Last edited by a moderator:
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  • #2
The pitch diameters should be tangential.
Use that diameter to lay out your centers for the bearings and shafts.
 

1. What is the purpose of tolerancing center distance?

The purpose of tolerancing center distance is to ensure that the gears are able to mesh properly and operate smoothly. It allows for a specified amount of variation in the distance between the centers of the gears while still maintaining proper functionality.

2. How is center distance tolerancing determined for internal gears?

Center distance tolerancing for internal gears is typically determined by calculating the maximum and minimum allowable center distances based on the gear dimensions and the desired clearance between the gears. This calculation takes into account factors such as tooth profile and tolerances for manufacturing and assembly.

3. What are the consequences of not considering center distance tolerancing?

If center distance tolerancing is not considered, the gears may not be able to mesh properly, leading to increased wear and potential damage to the gears. This can result in decreased efficiency and potential failure of the gears.

4. How does the quality of gear manufacturing impact center distance tolerancing?

The quality of gear manufacturing can have a significant impact on center distance tolerancing. If the gears are not manufactured to the specified dimensions and tolerances, the center distance may deviate from the desired value, resulting in potential issues with gear meshing and functionality.

5. Are there industry standards for center distance tolerancing?

Yes, there are industry standards for center distance tolerancing, such as ANSI/AGMA 2015-2-A16 and ISO 1328-2. These standards provide guidelines for determining the appropriate tolerances based on gear type, size, and application. It is important to follow these standards to ensure proper gear functionality and longevity.

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