INA stamped outer ring needle roller bearing installation and inspection methods

 I. Introduction
  The outer ring of the INA stamped outer ring needle roller bearing is precision stamped and formed by a thin steel plate, which has a small construction space and a large load capacity. Applicable to the installation space is limited and the housing hole should not be used as a raceway, and no further axial positioning after pressing into the bearing seat hole. Compared with the punched type outer ring needle roller bearing, the sealed type stamped outer ring needle roller bearing is very effective for sealing the shaft end. Since these needle roller bearings have grease (lithium grease), they can operate for a long period of time within the range of -20 to +120 degrees of service temperature.
  Second, the installation of tolerances
  According to the ZBJII020 standard and the world's needle roller bearing manufacturing companies (Japan NTN, KOYO, Germany INA, USA TORRINGTON) inspection requirements for stamped outer ring needle roller bearings: thin stamped outer ring wall, heat treatment is easy to deformation, measuring bearing before installation The outer diameter is meaningless. When measuring and testing, the measured bearing shall be pressed into the standard seat hole to obtain the final size and geometric accuracy. The deviation of the hole ruler should meet the recommended requirements (see Table 3). The diameter of the inscribed circle of the needle roller is approximately within the tolerance zone F8. Table 1: Recommended Seat Hole and Shaft Tolerances Housing Material (Rigid Housing) Note 1 Seat Hole Tolerance (Note 2) Shaft Tolerance (Note 1) Steel or Cast Iron N6 (N7) Light Metal (or Seat Hole Wall Thickness Less than 6mm) R6( R7 )
H5( h6 ) Note 1: For non-rigid housings, installation tests are required to determine the required shaft tolerance limits to obtain the desired working clearance.
  Note 2: The cylindrical geometry of the housing bore must be within half of the (IT 5)/2 value.
  Table 2: Table of tolerances for ISO-holes and shafts (partial)
Size range mm N6 (N7) R6 (R7) h5 (h6)
More than 3-6 -0.005~-0.013 (-0.004~-0.016) -0.012~-0.020 (-0.011~-0.023) 0~-0.005 (0~-0.008)
More than 6-10 -0.007~-0.016 (-0.004~-0.019) -0.016~-0.025 (-0.013~-0.028) 0~-0.006 (0~-0.009)
More than 10-18 -0.009~-0.020 (-0.005~-0.023) -0.020~-0.031 (-0.016~-0.034) 0~-0.008 (0~-0.011)
More than 18-30 -0.011~-0.024 (-0.007~-0.028) -0.024~-0.037 (-0.020~-0.041) 0~-0.009 (0~-0.013)
More than 30-40 -0.012~-0.028 (-0.008~-0.033) -0.029~-0.045 (-0.025~-0.050) 0~-0.011 (0~-0.016)
More than 40-50 -0.012~-0.028 (-0.008~-0.033) -0.029~-0.045 (-0.025~-0.050) 0~-0.011 (0~-0.016)
More than 50-65 -0.014~-0.033 (-0.009~-0.039) -0.035~-0.054 (-0.030~-0.060) 0~-0.013 (0~-0.019)
More than 65-80 -0.014~-0.033 (-0.009~-0.039) -0.037~-0.056 (-0.032~-0.062) 0~-0.013 (0~-0.019)
More than 80-100 -0.016~-0.038 (-0.010~-0.045) -0.044~-0.066 (-0.038~-0.073) 0~-0.015 (0~-0.022)
More than 100-120 -0.016~-0.038 (-0.010~-0.045) -0.047~-0.069 (-0.041~-0.076) 0~-0.015 (0~-0.022)
More than 120-140 -0.020~-0.045 (-0.012~-0.052 -0.056~-0.081 (-0.048~-0.088) 0~-0.018 (0~-0.025)
More than 140-160 -0.020~-0.045 (-0.012~-0.052) -0.058~-0.083 (-0.050~-0.090) 0~-0.018 (0~-0.025)
More than 160-180 -0.020~-0.045 (-0.012~-0.052) -0.061~-0.086 (-0.053~-0.093) 0~-0.018 (0~-0.025)
More than 180-200 -0.022~-0.051 (-0.014~-0.060) -0.068~-0.097 (-0.060~-0.106) 0~-0.020 (0~-0.029)
More than 200-225 -0.022~-0.051 (-0.014~-0.060) -0.071~-0.100 (-0.063~-0.109) 0~-0.020 (0~-0.029)
More than 225-250 -0.022~-0.051 (-0.014~-0.060) -0.075~-0.104 (-0.067~-0.113) 0~-0.020 (0~-0.029)
More than 250-280 -0.025~-0.057 (-0.014~-0.066) -0.085~-0.117 (-0.074~-0.126) 0~-0.023 (0~-0.032)
More than 280-315 -0.025~-0.057 (-0.014~-0.066) -0.089~-0.121 (-0.078~-0.130) 0~-0.023 (0~-0.032)
More than 315-355 -0.026~-0.062 (-0.016~-0.073) -0.097~-0.133 (-0.087~-0.144) 0~-0.025 (0~-0.036)
More than 355-400 -0.026~-0.062 (-0.016~-0.073) -0.103~-0.139 (-0.093~-0.150) 0~-0.025 (0~-0.036)
More than 400-450 -0.027~-0.067 (-0.017~-0.080) -0.113~-0.153 (-0.103~-0.166) 0~-0.027 (0~-0.040)
Over 450-500 -0.027~-0.067 (-0.017~-0.080) -0.119~-0.159 (-0.109~-0.172) 0~-0.027 (0~-0.040)
Over 500-560 -0.044--0.088 (-0.044--0.114) -0.150--0.194 (-0.150--0.220)
More than 560-630 -0.044~-0.088 (-0.044~-0.114) -0.155~-0.199 (-0.155~-0.225)
More than 630-710 -0.050~-0.100 (-0.050~-0.130) -0.175~-0.225 (-0.175~-0.255)
More than 710-800 -0.050~-0.100 (-0.050~-0.130) -0.185~-0.235 (-0.185~-0.265)
More than 800-900 -0.056~-0.112 (-0.056~-0.146) -0.210~-0.266 (-0.210~-0.300)
exceed
900-1000
-0.056~-0.112 (-0.056~-0.146) -0.220~-0.276 (-0.220~-0.310)
  Third, the bearing inspection size
  Since the thin-walled outer ring may not be round in the process, the dimensional accuracy of the drawn-out needle roller bearing cannot be verified before installation. Only when pressed into bearing housing holes with recommended tolerance limits can the bearings achieve the necessary geometrical accuracy. Then, you can check the dimensions as described below. 1. Press the bearing into the ring gauge (wall thickness ≥ 20mm); its aperture size must meet the requirements in Table 3. 2. When measuring the diameter of the inscribed circle, use tapered plug gauges for perforated bearings and cylindrical “over” and “but not” plug gauges for sealed bearings. Table 3: Inspection dimensions for drawn needle roller bearings Inscribed circle diameter Plug gauge diameter ΦFw mm
Bearing outer diameter ΦD
Mm
Ring gauge actual aperture
Deviation of μm in mm Deviation of μm
3 6.5 6.484 +24 +6
4 8 7.984 +28 +10
5 9 8.984 +28 +10
6 10 9.984 +28 +10
7 11 10.980 +31 +13
8 12 11.980 +31 +13
9 13 12.980 +31 +13
10 14 13.980 +31 +13
12 16 15.980 +34 +16
12 18 17.980 +34 +16
13 19 18.976 +34 +16
14 20 19.976 +34 +16
15 21 20.976 +34 +16
16 22 21.976 +34 +16
17 23 22.976 +34 +16
18 24 23.976 +34 +16
20 26 25.976 +41 +20
22 28 27.976 +41 +20
25 32 31.972 +41 +20
28 35 34.972 +41 +20
30 37 36.972 +41 +20
35 42 41.972 +50 +25
40 47 46.972 +50 +25
45 52 51.967 +50 +25
50 58 57.967 +50 +25
55 63 62.967 +60 +30
60 68 67.967 +60 +30
  Fourth, bearing installation method
  In order to avoid local deformation or brittle cracking of the stamped outer ring and prevent the normal working of the needle roller from being damaged, it is forbidden to strike the thin-walled outer ring with a hand hammer or the like when installing the bearing. A press or special installation tool should be used for installation. The needle roller bearing of the stamped outer ring is pressed into the bore of the bearing housing by means of a mounting mandrel, and the shaft shoulder of the assembly mandrel should be connected with the side of the bearing marked with a code, and an annular seal ring is arranged in the ring groove of the mandrel to make the bearing adhere steadily. If it is possible to use a press on the production line, it can simplify the assembly of bearings on the production line. Do not tilt the bearing during installation. Needle grease bearings should be filled with a sufficient amount of grease before assembly, because they cannot be relubricated after assembly. The reference bearing installation method is shown below.