Reduced backlash gear unit design /R
Helical, parallel-shaft helical, and helical-bevel gear units with reduced backlash are available from gear unit size 37. The rotational clearance of these gear units is significantly smaller than that of the standard designs which means that positioning tasks can be solved with great precision. The rotational clearance is specified in angular minutes in chapter "Geometrically possible combinations". The rotational clearance for the output shaft is specified without load (max. 1% of the rated output torque) with blocked gear unit input side. The specified values have a tolerance of ± 2 angular minutes.
The reduced backlash design is possible for the following gear units:
- Helical gear units (R) of gear unit sizes 37 to 167
- Parallel-shaft helical gear units (F) of gear unit sizes 37 to 157
- Helical-bevel gear units (only K..7) of gear unit sizes 37 to 187
With the exception of reduced backlash parallel-shaft helical gear units FH.87 and FH.97, the dimensions of low-backlash gear units are identical with the dimensions of the standard designs.
The following figure shows the deviating dimensions of the reduced backlash gear units FH.87 and FH.97:
Type | Dimensions in mm | ||||||||
|---|---|---|---|---|---|---|---|---|---|
D6 | D7 | G4 | M4 | M5 | M6 | M7 | O1 | O8 | |
FH.87/R | Ø 65 h6 | Ø 85 | Ø 163 | 41 | 40 | 46 | 45 | 312.5 | 299.5 |
FH.97/R | Ø 75 h6 | Ø 95 | Ø 184 | 55 | 50 | 60 | 55 | 382.5 | 367 |
