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The large-diameter slewing bearing specially designed for heavy machinery working conditions is forged with 42CrMo high-quality alloy steel, and the outer diameter range covers 1 meter to 10 meters. Through the optimized raceway geometry and induction hardening process, the product has excellent resistance to overturning moment and impact resistance, ensuring the smooth rotation and long-term service of cranes, shield machines and wind turbines under extreme loads, and undertaking wholesale business.
1 to ten meters customized
Outer diameter
60 HRC
Raceway hardness
up to seven levels
Gear accuracy
42CrMo or 50Mn forged steel raw material treated by vacuum degassing process, the purity of the material reaches the industrial special standard. Compared with ordinary cast steel, its tensile strength is increased by 35%, and its yield strength exceeds 800MPa, effectively eliminating the risk of ferrule fracture under thousands of tons of heavy-duty operation of large-scale equipment and ensuring structural integrity.
The surface of the raceway is treated by numerical control induction hardening, the depth of the effective hardening layer is stably controlled between 4mm and 6mm, and the surface hardness reaches 58-62 HRC. This deep hardening treatment extends the contact fatigue life of the raceway by 2.5 times, and even under the condition of 24 hours of continuous operation, it can maintain more than 100,000 hours of trouble-free operation.
The tooth part of the large-diameter slewing bearing adopts high-precision grinding process, and the gear accuracy level reaches ISO 7 or higher. The flank clearance is strictly controlled in the range of 0.15mm to 0.25mm. This micron-level meshing accuracy reduces the transmission impact by 70% and controls the operating noise below 85 decibels during high-speed rotation.
Equipped with anti-aging nitrile rubber material of double lip or 3 lip labyrinth seal ring, protection level reached IP65 standard. The sealing structure can effectively prevent sand dust, salt spray and rainwater from invading the inside of the raceway, prevent grease leakage, and extend the maintenance cycle of the product in extreme environments such as deserts and oceans to 6 months.
The raceway contact angle design optimized by finite element analysis (usually 45 degrees or 90 degrees) achieves the best balance of axial force, radial force and huge overturning moment. Compared with the traditional design, the rated static load capacity is increased by 20% under the same diameter, which is especially suitable for the equipment with severe center of gravity change such as port crane and stacker reclaimer.
Each set of large diameter slewing bearing shall pass 100% ultrasonic flaw detection and magnetic particle flaw detection before leaving the factory. Strictly follow EN 10228-3 flaw detection standard to ensure that there are no cracks, pores or slag inclusions inside the ferrule, and no invisible micro-cracks on the tooth surface, so as to eliminate major safety accidents from the source.
| Parameter Items | Specifications | Notes |
| Product diameter range | Outer diameter 1,000 mm – 10,000 mm | Supports non-standard size customization |
| Main material | 42CrMo / 50Mn alloy structural steel | After heat treatment, it exhibits excellent overall mechanical properties. |
| Raceway hardness | 55 – 62 HRC | Medium frequency induction hardening process |
| Soft band processing | The soft band area is marked with an “S” | It must be installed in a non-load-bearing area. |
| Gear type | External teeth / Internal teeth / Toothless | Optional straight or helical tooth design |
| Gear precision | ISO Level 7–9 | Gear grinding can be performed as needed. |
| Axial clearance | 0.05 mm – 0.20 mm | Preload design eliminates clearance |
| Sealing material | NBR (Nitrile Butadiene Rubber) / Viton (Fluororubber) | Temperature range: -40℃ to +200℃ |
| Lubrication method | Centralized lubrication system interface / manual grease nipple | Prefilled extreme pressure lithium-based grease |
| Manufacturing standards | JB/T 10471, JB/T 2300 | Conforms to internationally accepted slewing bearing standards |
This large diameter slewing bearing adopts the integral seamless forging ring technology, rather than the tailor welding process used in low-end products on the market. The integral forging eliminates the stress concentration points 1 the weld, improves the fatigue resistance of the product under alternating load by more than 40%, and completely avoids the hidden danger of weld cracking after long-term use. In the heat treatment process, we implemented the full raceway scanning quenching and tempering treatment to ensure the uniformity of the hardened layer and the stability of the metallographic structure. Compared with the common “jump” quenching of similar products, our process eliminates the soft spot area on the raceway surface, making the ball or roller wear evenly during operation, and avoiding the sticking phenomenon caused by local peeling.
In view of the tooth breakage problem that is easy to occur when large excavators and stacker-reclaimers start at high torque, we have carried out shot peening treatment on the tooth root, and adopted surface quenching process on the tooth surface, so that the bending fatigue strength of the tooth root is increased by 30%, and the instantaneous impact load is effectively resisted.
In view of the high salt spray corrosion pain points faced by offshore cranes and port machinery, we sprayed zinc-rich anti-corrosion coating with a thickness of 150 microns on the sealing groove and non-matching surface, and cooperated with multi-layer labyrinth sealing, which successfully solved the problems of raceway rust and cage fracture caused by salt spray erosion.
In view of the problems of rotary shaking and inaccurate positioning of large-diameter equipment after several years of operation, we have eliminated the trace clearance inside the bearing before leaving the factory through the negative clearance pre-tightening assembly technology, which greatly improves the rigidity of the system and solves the problem of unstable operation of the equipment caused by excessive clearance.
It is suitable for slewing mechanism of port portal crane and quayside container crane (quayside bridge). The product can withstand huge overturning moment and axial load, adapt to the 24-hour uninterrupted high-intensity operation of the port, and greatly reduce the huge logistics loss caused by downtime and bearing replacement.
Designed for shield machine cutterhead drive system. Such applications require bearings with extremely high sealing performance and bearing capacity to resist the invasion of underground sediment slurry and the huge reaction force during tunneling, ensuring the continuity and safety of underground construction.
Suitable for pitch bearings and yaw bearings of megawatt wind turbines. The product is optimized for high-altitude and low-temperature environment. Special low-temperature steel and anti-corrosion coating are used to ensure that the fan can accurately adjust the blade angle and engine room orientation in harsh weather and improve power generation efficiency.
For bucket wheel stacker reclaimer, large hydraulic excavator and other mining equipment. In view of the characteristics of large dust and heavy impact load, the product strengthens the dust seal design and impact toughness, helping mining enterprises to reduce the equipment failure rate and maintenance costs caused by harsh environment.
Before installing the large diameter slewing bearing, the flatness of the mounting bracket must be checked with a laser level. The flatness error of the installation surface shall be controlled within two ten thousandths of the diameter, and the paint, welding slag and burrs on the surface shall be removed to prevent the deformation of the bearing from causing the operation jam.
High-strength bolts of grade 10.9 or 12.9 must be used and coated with thread fastening glue. The tightening shall follow the principle of 180-degree symmetrical crisscross, and tighten it step by step with a torque wrench in 3 steps (30%, 80% and 100 torque) to ensure uniform distribution of installation pre-tightening force.
During the installation process, be sure to find the position of the soft belt marked “S” on the end face of the ferrule (that is, the ceasefire area of the quenching belt). The soft zone should be placed in the non-load zone or the non-frequent force zone (I. e. the position perpendicular to the main load direction) to avoid stress concentration causing damage to the raceway.
After the initial installation, add extreme pressure lithium grease while rotating the bearing slowly until the grease escapes evenly from the sealing lip. In the first 100 hours of equipment operation, it is recommended to check the bolt preload every 8 hours and add grease to complete the best running-in.
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The large-diameter slewing bearing specially designed for heavy machinery working conditions is forged with 42CrMo high-quality alloy steel, and the outer diameter range covers 1 meter to 10 meters. Through the optimized raceway geometry and induction hardening process, the product has excellent resistance to overturning moment and impact resistance, ensuring the smooth rotation and long-term service of cranes, shield machines and wind turbines under extreme loads, and undertaking wholesale business.
Outer diameter
1 to ten meters customized
Raceway hardness
60 HRC
Gear accuracy
up to seven levels
42CrMo or 50Mn forged steel raw material treated by vacuum degassing process, the purity of the material reaches the industrial special standard. Compared with ordinary cast steel, its tensile strength is increased by 35%, and its yield strength exceeds 800MPa, effectively eliminating the risk of ferrule fracture under thousands of tons of heavy-duty operation of large-scale equipment and ensuring structural integrity.
The surface of the raceway is treated by numerical control induction hardening, the depth of the effective hardening layer is stably controlled between 4mm and 6mm, and the surface hardness reaches 58-62 HRC. This deep hardening treatment extends the contact fatigue life of the raceway by 2.5 times, and even under the condition of 24 hours of continuous operation, it can maintain more than 100,000 hours of trouble-free operation.
The tooth part of the large-diameter slewing bearing adopts high-precision grinding process, and the gear accuracy level reaches ISO 7 or higher. The flank clearance is strictly controlled in the range of 0.15mm to 0.25mm. This micron-level meshing accuracy reduces the transmission impact by 70% and controls the operating noise below 85 decibels during high-speed rotation.
Equipped with anti-aging nitrile rubber material of double lip or 3 lip labyrinth seal ring, protection level reached IP65 standard. The sealing structure can effectively prevent sand dust, salt spray and rainwater from invading the inside of the raceway, prevent grease leakage, and extend the maintenance cycle of the product in extreme environments such as deserts and oceans to 6 months.
The raceway contact angle design optimized by finite element analysis (usually 45 degrees or 90 degrees) achieves the best balance of axial force, radial force and huge overturning moment. Compared with the traditional design, the rated static load capacity is increased by 20% under the same diameter, which is especially suitable for the equipment with severe center of gravity change such as port crane and stacker reclaimer.
Each set of large diameter slewing bearing shall pass 100% ultrasonic flaw detection and magnetic particle flaw detection before leaving the factory. Strictly follow EN 10228-3 flaw detection standard to ensure that there are no cracks, pores or slag inclusions inside the ferrule, and no invisible micro-cracks on the tooth surface, so as to eliminate major safety accidents from the source.
| Parameter Items | Specifications | Notes |
| Product diameter range | Outer diameter 1,000 mm – 10,000 mm | Supports non-standard size customization |
| Main material | 42CrMo / 50Mn alloy structural steel | After heat treatment, it exhibits excellent overall mechanical properties. |
| Raceway hardness | 55 – 62 HRC | Medium frequency induction hardening process |
| Soft band processing | The soft band area is marked with an “S” | It must be installed in a non-load-bearing area. |
| Gear type | External teeth / Internal teeth / Toothless | Optional straight or helical tooth design |
| Gear precision | ISO Level 7–9 | Gear grinding can be performed as needed. |
| Axial clearance | 0.05 mm – 0.20 mm | Preload design eliminates clearance |
| Sealing material | NBR (Nitrile Butadiene Rubber) / Viton (Fluororubber) | Temperature range: -40℃ to +200℃ |
| Lubrication method | Centralized lubrication system interface / manual grease nipple | Prefilled extreme pressure lithium-based grease |
| Manufacturing standards | JB/T 10471, JB/T 2300 | Conforms to internationally accepted slewing bearing standards |
In view of the tooth breakage problem that is easy to occur when large excavators and stacker-reclaimers start at high torque, we have carried out shot peening treatment on the tooth root, and adopted surface quenching process on the tooth surface, so that the bending fatigue strength of the tooth root is increased by 30%, and the instantaneous impact load is effectively resisted.
In view of the high salt spray corrosion pain points faced by offshore cranes and port machinery, we sprayed zinc-rich anti-corrosion coating with a thickness of 150 microns on the sealing groove and non-matching surface, and cooperated with multi-layer labyrinth sealing, which successfully solved the problems of raceway rust and cage fracture caused by salt spray erosion.
In view of the problems of rotary shaking and inaccurate positioning of large-diameter equipment after several years of operation, we have eliminated the trace clearance inside the bearing before leaving the factory through the negative clearance pre-tightening assembly technology, which greatly improves the rigidity of the system and solves the problem of unstable operation of the equipment caused by excessive clearance.
It is suitable for slewing mechanism of port portal crane and quayside container crane (quayside bridge). The product can withstand huge overturning moment and axial load, adapt to the 24-hour uninterrupted high-intensity operation of the port, and greatly reduce the huge logistics loss caused by downtime and bearing replacement.
Designed for shield machine cutterhead drive system. Such applications require bearings with extremely high sealing performance and bearing capacity to resist the invasion of underground sediment slurry and the huge reaction force during tunneling, ensuring the continuity and safety of underground construction.
Suitable for pitch bearings and yaw bearings of megawatt wind turbines. The product is optimized for high-altitude and low-temperature environment. Special low-temperature steel and anti-corrosion coating are used to ensure that the fan can accurately adjust the blade angle and engine room orientation in harsh weather and improve power generation efficiency.
For bucket wheel stacker reclaimer, large hydraulic excavator and other mining equipment. In view of the characteristics of large dust and heavy impact load, the product strengthens the dust seal design and impact toughness, helping mining enterprises to reduce the equipment failure rate and maintenance costs caused by harsh environment.
Before installing the large diameter slewing bearing, the flatness of the mounting bracket must be checked with a laser level. The flatness error of the installation surface shall be controlled within two ten thousandths of the diameter, and the paint, welding slag and burrs on the surface shall be removed to prevent the deformation of the bearing from causing the operation jam.
High-strength bolts of grade 10.9 or 12.9 must be used and coated with thread fastening glue. The tightening shall follow the principle of 180-degree symmetrical crisscross, and tighten it step by step with a torque wrench in 3 steps (30%, 80% and 100 torque) to ensure uniform distribution of installation pre-tightening force.
During the installation process, be sure to find the position of the soft belt marked “S” on the end face of the ferrule (that is, the ceasefire area of the quenching belt). The soft zone should be placed in the non-load zone or the non-frequent force zone (I. e. the position perpendicular to the main load direction) to avoid stress concentration causing damage to the raceway.
After the initial installation, add extreme pressure lithium grease while rotating the bearing slowly until the grease escapes evenly from the sealing lip. In the first 100 hours of equipment operation, it is recommended to check the bolt preload every 8 hours and add grease to complete the best running-in.
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