The internal gear ring is a ring-shaped transmission component. Its structural features include tooth profiles distributed on the inner side of the ring body, which achieve torque transmission by meshing with external gears (pinions).
It presents a rigid ring shape as a whole, with involute tooth profiles mostly adopted. The tooth surface is hardened to enhance wear resistance. It is often matched with other components to bear radial and axial forces. Due to its compact structure and high space utilization, it is widely used in equipment such as reducers and slewing bearings.
Range of external diameter: 100 mm to 70000 mm
Quenching and tempering materials:45 #, 35SiMn, 40Cr, 40CrNi, 40MnB
Quenched materials:20Cr, 20CrMnTi, 20MnB, 20CrMnTo
Quenching and tempering hardness: HB220-260
Quenching hardness: 48-55
Delivery type: 35-50 days
| Type | Parameters | modulus | ring gear teeth | pinion teeth | total transmission ratio | maximum torque | standard torque | maximum holding torque | radial rated static load | axial rated static load | radial rated dynamic load | radial rated dynamic load | weight (including 12KG of RE-300 hydraulic motor) | pressure difference | oil retention, output speed | output speed | maximum achievable torque |
| code | m | z2 | z1 | i | Md max | Md nom | Mh | Co rad | Co ax | C rad | C ax | △P | Q | n | Md | ||
| unit | [mm] | [-] | [-] | [-] | [Nm] | [Nm] | [Nm] | [kN] | [kN] | [kN] | [kN] | [kg] | [bar] | [I/min] | [min-1] | [Nm] | |
| SG-H-0455 | 8 | 72 | 15 | 4.80 | 26289 | 17209 | 26289 | 508 | 1360 | 236 | 275 | 190 | 195 | 38 | 3 | 26289 | |
| SG-H-0555 | 8 | 87 | 15 | 5.80 | 31036 | 20510 | 31036 | 619 | 1658 | 253 | 296 | 215 | 195 | 45 | 3 | 31036 | |
| SG-H-0655 | 8 | 99 | 15 | 6.60 | 35783 | 23795 | 35783 | 731 | 1957 | 269 | 314 | 245 | 195 | 52 | 3 | 35783 | |
| SG-H-0755 | 8 | 111 | 15 | 7.40 | 40165 | 26793 | 40165 | 843 | 2257 | 284 | 331 | 265 | 195 | 57 | 3 | 40165 | |
| SG-H-0855 | 8 | 123 | 15 | 8.20 | 44821 | 31111 | 44821 | 954 | 2556 | 299 | 349 | 295 | 195 | 64 | 3 | 44821 | |
| SG-H-0955 | 8 | 135 | 15 | 9.00 | 49293 | 34524 | 49293 | 1066 | 2855 | 311 | 363 | 320 | 195 | 70 | 3 | 49293 | |
| SG-H-1120 | 6 | 215 | 20 | 10.75 | 59000 | 39000 | 59000 | 1053 | 3700 | 355 | 413 | 2 | 59000 |
Internal gear teeth directly machined on the bearing ring.
Eliminates the need for separate gear components.
Reduces assembly complexity and overall system footprint.
Customer Value: Lower component count, simplified installation, improved reliability.
Designed to support radial, axial, and moment loads (depending on configuration).
Optimized raceway geometry ensures stable load distribution.
Customer Value: Suitable for heavy-duty and precision rotational systems.
Precision-ground internal gear teeth for smooth meshing.
Controlled backlash and excellent transmission accuracy.
Customer Value: Stable torque transmission with low vibration and noise.
Compact configuration ideal for confined installation environments.
Constant cross-section design options available.
Customer Value: Enables lightweight and compact equipment development.
Custom module, tooth profile, and gear accuracy grade available.
Various materials: alloy steel, bearing steel, stainless steel.
Surface treatments: carburizing, nitriding, black oxide, anti-corrosion coating.
Customer Value: Flexible adaptation to different torque, speed, and environmental requirements.
Advanced heat treatment improves hardness and wear resistance.
Precision grinding ensures smooth rotation and reduced friction.
Customer Value: Extended maintenance cycles and reduced downtime.
Rotary forging tables
Ring rolling machines
Large press rotation mechanisms
Manipulator rotation systems
Withstands extreme shock and impact loads
High torque transmission for heavy metal forming
Excellent wear resistance under high-temperature environments
Long service life in continuous heavy-duty production
Customer Benefit: Reduced downtime and improved equipment stability in high-load forging processes.
Excavator upper structure rotation
Crane slewing systems
Concrete pump truck bases
Aerial platform turntables
Supports combined axial, radial, and moment loads
Integrated gear design reduces structural complexity
Reliable operation under dust, vibration, and outdoor conditions
Customer Benefit: Higher structural strength and safer rotational performance in field operations.
Main ApplicationsBucket wheel excavators
Rotary crushers
Stacker-reclaimers
Drilling rigs
Designed for extreme load and abrasive environments
Superior hardness and surface treatment options
Stable torque transmission in low-speed heavy-load systems
Customer Benefit: Extended maintenance intervals and improved reliability in harsh mining environments.
Injection molding rotary tables
Extrusion equipment drive systems
Blow molding machine rotation units
High precision gear machining ensures smooth operation
Stable rotation for synchronized production cycles
Compact structure for space-saving machine design
Customer Benefit: Improved product consistency and reduced mechanical vibration.
Rotary drilling tables
Chemical reactor rotation systems
Heavy-duty process equipment
Offshore rotating platforms
High corrosion resistance options available
Stable performance in high-temperature and corrosive environments
Engineered for continuous-duty industrial operation
Customer Benefit: Increased operational safety and durability in critical process industries.
CNC rotary tables
Machining center indexing systems
Heavy-duty positioning platforms
Horizontal boring machine turntables
High gear precision for accurate positioning
Smooth rotation with controlled backlash
Compact integrated structure for machine tool optimization
Customer Benefit: Higher machining accuracy and improved production efficiency.
In addition, our Inner Gear Ring is widely used in industries such as construction, food, shipbuilding, leather, textiles, fans, and water pumps.
The Inner Gear Ring delivers measurable value in three key dimensions:
Performance: High torque, high load, high precision
Reliability: Durable structure, long service life
Efficiency: Simplified design, reduced lifecycle cost
It is a strategic component for manufacturers seeking higher equipment stability, optimized structure, and improved market competitiveness.
VKUKEN has over 30 years of experience in bearing design and manufacturing. We can customize non-standard bearings according to customer drawings, or we can measure and create drawings of existing bearings on-site and then manufacture custom bearings based on those drawings. Our team of professional engineers has over 20 years of experience in bearing design and measurement.
We have found that many people would like to learn about the application technology and selection of Bearing but do not have suitable materials to read. Our team of engineers constantly exports technology on our download page and blog, which you can download for free.
Hi, I am Maxwell, I am an engineer in the field of bearing applications. I majored in mechanical and electromechanical engineering during college. After graduation, I worked for the top three "SKF" bearing companies in the world for ten years , during which I went to dozens of customers in different industries to help them solve problems in bearing applications; later I joined VKUKEN Bearing Manufacturing, and I will share bearing technical knowledge on this website from time to time. If you are a customer Please contact me to help you solve your problem; if you are also a technical expert in bearings, I am very willing to exchange technical knowledge about bearings with you.
