RK Series Four Point Contact Ball Bearing
1. Description
With the outer diameter of 20 to 47 inches, the RK series four point contact ball bearing is designed with flanges in either or both of its rings. The adoption of flanges reduces weight and enables equipment designers to design the shape of adjacent installation structures and the arrangement of bolts more flexibly.
2. Features
a. The four point contact ball bearing is available in internal tooth type, external tooth type, and no tooth type, providing designers with the maximum selection flexibility.
b. This line of slewing bearing is designed with deep groove raceway and four-point contact is realized by balls. This enables the deep groove ball bearing to bear radial, axial, and torque loads at the same time.
c. The spacing ball and carrying ball are arranged at intervals, which provides the ball bearing with reduced rotational resistance torque and better performance in occasions of oscillating movement.
d. Perfect opposing sealing can help discharge pollutants.
e. Involute short teeth are adopted. The pressure angle is 20° and the allowable backlash is 0.005 to 0.015 inches.
f. All RK series rolling bearings are equipped with 4 grease nipples spaced by 90 degrees. For the no tooth type and internal tooth type, the grease nipple is located in the outer ring. For ball bearings with external tooth, the nipple is in the inner ring.
3. Supply Capacity
The RK series four point contact ball bearing can be delivered within the shortest time and we can provide slewing ring bearings with customized non-standard screw holes and gears.
4. Application
This series of four point contact ball bearing enjoys wide applications in the light-load and medium-load occasions, including
a. Small crane, boom and elevator
b. Industrial position sensor and rotary table
c. Rotating chute
d. Stretch wrapping machine
e. Bottle filling machine
f. Conveyor and related handling equipment
g. Rotational display
- RK External Gear
- RK External Gear
- RK No Gear
5. Technical Parameters
| No Gear | ||||||||||||||||
| P/N | OUTLINE DIMENSIONS AND WEIGHT | MOUNTING HOLES | GEAR DATA INV. STUB, α = 20° | MOMENT RATING Crm | ||||||||||||
| OUTER RING | INNER RING | |||||||||||||||
| Do | di | Dr | Di | do | dr | G APPROX. | Lo | no | Li | ni | D2 | Pd | z2 | Fz | ||
| (in) | (in) | (in) | (in) | (in) | (in) | (lbs) | (in) | (in) | (in) | (lbs) | (ft-lbs) | |||||
| RK6-16P1Z | 20.390 | 11.970 | 17.870 | 16.220 | 16.140 | 14.490 | 58 | 19.250 | 8 | 13.130 | 12 | — | — | — | — | 22,700 |
| RK6-22P1Z | 25.510 | 17.090 | 22.990 | 21.340 | 21.260 | 19.610 | 76 | 24.380 | 12 | 18.130 | 15 | — | — | — | — | 37,700 |
| RK6-25P1Z | 29.450 | 21.030 | 26.930 | 25.280 | 25.200 | 23.550 | 89 | 28.380 | 12 | 22.130 | 18 | — | — | — | — | 49,800 |
| RK6-29P1Z | 33.390 | 24.970 | 30.870 | 29.220 | 29.140 | 27.490 | 104 | 32.250 | 15 | 26.130 | 18 | — | — | — | — | 54,200 |
| RK6-33P1Z | 37.320 | 28.900 | 34.800 | 33.150 | 33.070 | 31.420 | 118 | 36.250 | 18 | 30.000 | 18 | — | — | — | — | 56,500 |
| RK6-37P1Z | 41.260 | 32.840 | 38.740 | 37.090 | 37.010 | 35.360 | 132 | 40.130 | 18 | 34.000 | 20 | — | — | — | — | 65,200 |
| RK6-43P1Z | 47.170 | 38.750 | 44.650 | 43.000 | 42.920 | 41.270 | 153 | 46.000 | 18 | 39.880 | 24 | — | — | — | — | 75,500 |
| Tolerances | ±.040 | ±.040 | .000 -.080 | Ref. | Ref. | .080 -.000 | ||||||||||
