ZB2.28.1222.400-1SPPN

ZB2 Double row slewing rings
  • ZB2 Double row slewing rings
  • ZB2 Double row slewing rings
  • ZB2 Double row slewing rings
  • ZB2 Double row slewing rings

ZB2.28.1222.400-1SPPN-ZB2 Double row slewing rings

The ZB2 series is a robust double-row ball slewing bearing with internal gear design, tailored for medium and heavy-duty rotary machinery requiring high load stability and integrated transmission capability. Different from common single-row slewing rings, this series adopts a dual-ball symmetrical arrangement and one-piece outer gear structure. Through optimized raceway geometric design and standardized industrial manufacturing, it achieves excellent mechanical rigidity and reliable rotary performance, ideal for continuous cycling operation and complex load industrial equipment scenarios.


Typical Applications:

Crawler and mobile cranes

Tower crane slewing platforms

Excavator swing circles

Aerial work platforms

Port and material handling equipment


High load-carrying capacity
Resistance to high and low temperatures
Noise-free operation
Strictly controlled tolerances and appropriate internal clearance
Long service life and low maintenance requirements
Prevention of unexpected downtime (avoiding bearing fracture, seizure, and safety incidents caused by such failures, with anti-tilting capability)

Dimension and Parameters

ZB2 Double row slewing rings
Type :ZB2.28.1222.400-1SPPN
Brand :LYMC
Drawing No. :Drawing 2
Dimensions
De[mm] :1345
de[mm] :1225
di[mm] :1219
Di[mm] :10616
Dx[mm] :1115
He[mm] :98
Hi[mm] :98
Ht[mm] :108
Hd[mm] :88
Fixing Holes
Fe[mm] :1290
Fi :1150
N :40
V[mm] :21
L :31
W :16
Gear Data
m :10
z :108
xm :-
Dp :1080
fz norm :7333
fz max :146,67
Weight [KG] :331

Characteristics

✦ Dual-row ball layout – Two rows of balls arranged in a tandem configuration, sharing a common raceway centerline for compact load transfer.

✦ External gear on outer ring – Gear teeth are milled and induction-hardened on the outer ring periphery for direct pinion drive.

✦ Integral raceway ribs – Each ball row is guided by a continuous, machined rib on both sides to maintain ball spacing and alignment.

✦ Two-stage hardening process – Raceways undergo a dual-frequency induction hardening process, creating a deep, uniform case depth of 3–4 mm.

✦ Ring thickness profile – Outer ring features a tapered cross-section, thicker at the gear root and thinner at the mounting face for weight optimization.

✦ Weather-resistant seals – Equipped with heavy-duty polyurethane lip seals, offering enhanced abrasion resistance compared to standard NBR.


Features

✦ Simplified alignment – Compact ring design allows greater tolerance for minor misalignment during installation without performance loss.

✦ Weldable mounting zone – Selected areas can be left unhardened for direct welding to steel structures, eliminating bolt-hole drilling in some applications.

✦ Gear root reinforcement – The tapered outer ring design places extra material at the gear root, improving resistance to tooth breakage under shock loads.

✦ Deeper hardened case – Dual-frequency hardening creates a thicker wear-resistant layer that extends life in abrasive conditions.

✦ Positive ball guidance – Integral raceway ribs prevent ball skewing, ensuring consistent torque output even during rapid start-stop cycles.

✦ Better seal life in harsh weather – Polyurethane seals resist cracking and hardening in extreme cold and UV exposure.


Further Reading