Where INA needle roller and cage assemblies are to be used, the housing bore and the shaft raceway must be hardened and ground. The surface hardness of the raceways must be 670 HV + 170 HV, the hardening depth CHD or SHD must be sufficiently large.
Raceway design
|
Shaft - diameter |
Bore - tolerance |
Shaft tolerance | Roughness | Roundness | Parallelism | |||
|---|---|---|---|---|---|---|---|---|
|
Nominal dimension mm |
Bearing clearance | |||||||
| over | incl. | Small | Normal | Large | max. | max. | max. | |
| - | 80 | G6 | j5 | h5 | g6 | Ra0,2(Rz1) | IT3 | IT3 |
| H6 | h5 | g5 | f6 | |||||
| 80 | 120 | G6 | h5 | g5 | f6 | Ra0,3(Rz1,6) | ||
| 120 | - | G6 | h5 | g5 | f6 | Ra0,4(Rz2,5) | ||
| H6 | - | f5 | e6 | |||||
Raceway width
The The raceway width must be at least equal to the cage width Bc (Bc is produced with a minus (–) tolerance); values for Bc, see dimension tables. The distance between the axial limit surfaces should therefore be toleranced to H12.
Raceway width and axial running surfaces
The axial running surfaces for the needle roller and cage assemblies must be precision machined (Ra2 recommended) and resistant to wear.
Axial location
INA needle roller and cage assemblies must be axially located. They are located by means of snap rings or appropriate design of the adjacent construction.
If location is by means of snap rings or retaining rings, a washer must be arranged in front of the ring. It must be ensured that there is sufficient interference between the ring and washer.
Axial location by adjacent construction
