Custom Industrial 20CrMnTi Hypoid Rotary Platform Gear Ultra-high Positioning

Product Specification

20CrMnTi High Precision Ultra-high Positioning Rotary Platform Gear

Rotary platform gears include precision hollow platform hypoid/helical gear sets and slewing ring gears(internal/external tooth). Consisting of driving pinion and large ring gear, they are core transmission parts for hollow rotary reducer, CNC indexing table and slew drive. Main raw materials: 42CrMo,20CrMnTi,40Cr, finished via carburizing/induction hardening & precision gear grinding with ISO5~7 accuracy grade. It amplifies output torque via gear reduction, equipped with cross roller bearing for load support, realizing high-precision indexing, continuous rotation and fixed positioning. Precision type for automation, robot joint, 4th CNC axis; heavy-duty ring gear for construction machinery, solar tracker, radar base and lifting equipment.

Product Features

• High precision & low backlash: Gear grinding, backlash 0.01~0.05mm, repeat accuracy 3~30arcsec, no idle slipping during indexing.
• Hypoid/helical meshing: Double contact ratio vs spur gear, stable transmission, low noise and strong overload resistance.
• Wear-resistant high hardness: Tooth surface HRC58~62 after hardening, core temper HRC28~38, anti-fatigue & anti-tooth breakage.
• Complete structure options: External/internal ring gear & matched pinion, support horizontal/vertical/inverted installation.
• Compact high torque: Single-stage large reduction ratio, small dimension with high output torque to save mounting space.
• Anti-corrosion: Blackening/phosphating finish against cutting fluid, dust and humid environment.
• Strong interchangeability: Fit HD/BPHB/DG hollow platform and standard slew bearing for easy replacement.
• Long service & low maintenance: Sealed grease lubrication with long maintenance interval.

Technical Parameter Table

Working Principle

• Precision hypoid hollow platform: Servo/stepper motor drives input pinion, 90° cross meshing with large hypoid ring gear for single-stage reduction & torque amplification; ring gear together with turntable and cross roller bearing rotates circumferentially for arbitrary precision indexing.
• Slewing ring gear: Driving pinion meshes internal/external ring gear, pinion rotates and walks along ring tooth to drive relative rotation of inner/outer slew ring. Internal tooth: inner ring geared, outer ring rotating; External tooth: outer ring geared, inner ring fixed; slew bearing bears axial, radial and tilting moment.
• Self-locking: Matched with servo brake/worm gear, gear self-lock after stop to avoid reverse rotation and load drop.

Application

• Precision automation: Hollow rotary reducer, CNC 4th axis, indexing plate, automation fixture turntable, CCD inspection rotary table, robot joint axis.
• Light industry: Packing machine, labeling machine, printer, laser marking rotary jig.
• Heavy machinery: Excavator slew, crane turntable, truck crane slew drive, port loading equipment.
• New energy: Solar tracker gear, radar pedestal, heavy-duty surveillance PTZ.
• Replacement spare parts: OEM spare gear for HD/BPHB series platform & slew bearing maintenance.

Advantages

• Ultra-high positioning: Grinding + backlash adjustable structure, arcsec-level repeat accuracy, infinitely variable angle indexing superior to cam indexer.
• High rigidity load: Cross roller bearing improves anti-tilting capacity 10x vs common bearing, direct load without auxiliary support.
• Hollow wiring convenience: Central through-hole for cable/air pipe routing without winding.
• High efficiency: 92%~96% transmission efficiency for hypoid/helical gear, low power loss & low temperature rise.
• Multi-direction mounting: Horizontal/vertical/inverted/side mounting for flexible layout.
• Customizable: Custom module, tooth number, ratio, inner/outer diameter available.
• Long service life: Alloy steel + full heat treatment, abrasion resistant for 3~8 years normal service.

Production Process

• Raw material inspection: Spectrum test & flaw detection for steel bar.
• Forging & rough turning: Blank forging, CNC rough turning for OD/ID & reference face.
• Gear cutting: Hobbing for spur/helical tooth, special machine for hypoid gear shaping.
• Deburr & chamfer: Tooth end & bore chamfer to eliminate abnormal noise.
• Overall tempering: Bulk temper to HRC28~38 for better toughness.
• Tooth hardening: Carburizing for 20CrMnTi; induction hardening for 42CrMo/40Cr to HRC58~62.
• Precision gear grinding: Form grinding to reach ISO5~7 precision & qualified backlash.
• Finish grinding: Bore & end face grinding to control runout & concentricity.
• Anti-rust treatment: Blackening/phosphating + anti-rust grease.
• Matching test run: Pinion & ring gear trial assembly before final QC & packaging.

Why Choose us?

• 7-axis CNC Grinding: We adopt high-precision 7-axis CNC grinding machines, holding tolerances as tight as ±5μm, ensuring gears run quietly, smoothly and with outstanding durability.
• Strong technical expertise: Our core R&D team includes doctoral and master’s professionals specializing in spiral bevel gear technology, providing strong technical support for complex projects.
• Rigorous testing & high precision: All gears undergo 100% inspection with Gleason metrology systems. We can achieve DIN 6 grade accuracy with strict control over tooth profile and direction errors, keeping our quality at the industry-leading level.
• High transmission efficiency: Our gear designs support a single-stage reduction ratio of up to 300:1, with actual transmission efficiency reaching over 95%, greatly improving energy utilization.
• Excellent durability & cost efficiency: Our gears deliver 40% lower lifecycle cost and a failure rate below 0.5%, ensuring stable long-term operation and reduced maintenance costs.
• Fast response & short lead time: Supported by our digitalized production process, we are able to shorten the delivery cycle to only 20 working days, helping you accelerate project development and launch.
• Professional custom design capability: We provide fully customized gear solutions for applications requiring high-reduction, high-speed, heavy-load, low-noise, and special small-tooth profiles, based on your actual working conditions.