China High Strength Precise Transmission 246 High-Speed Flat Sewing Machine Gear

China High Strength Precise Transmission 246 High-Speed Flat Sewing Machine Gear 

246 high-speed flat sewing machine gears are dedicated transmission gear sets for 246 cylinder-bed single-needle unison-feed flat sewing machines, including spindle gear, upper shaft gear, lower shaft gear, feed gear, hook gear, bevel gear, compatible with JUKI DSC-246, SW-246, etc. Made of 20CrMnTi/40Cr/45# steel with carburizing/induction hardening + precision grinding, they feature high speed, low noise, impact resistance, wear resistance, precise transmission and long service life. They drive key motions: spindle power transmission, needle bar up/down, feed dog pushing, hook looping, presser foot lifting, serving as the core transmission components for leather, handbag, shoe upper and heavy material sewing.

 Product Features

• High speed adaptation: Compatible with 3000–3500rpm max speed; no overheating or skipping in continuous high-speed operation.
• Low noise & smooth: Precision spur/bevel gear design, meshing clearance 0.05–0.10mm, noise ≤65dB, quiet in heavy material sewing.
• Wear resistance & long life: HRC 56–62 tooth surface, 0.8–1.2mm hardening depth, service life ≥6000 hours, durable for leather/heavy materials.
• High strength & impact resistance: Thickened tooth root, withstand 30–80N·m torque, no chipping in 8–15mm thick material sewing.
• Precise transmission & stable stitch length: ISO Grade 7 accuracy, Ra≤0.8μm tooth surface, stitch error ≤0.1mm, uniform feeding.
• 246 dedicated structure: 50mm cylinder diameter, 15mm presser foot lift, 25cm working space, perfect match for 246 mounting dimensions.
• Bi-directional drive & smooth reversing: Smooth forward/reverse meshing, no jamming in reverse stitching, suitable for frequent reversing.
• Wide interchangeability & easy maintenance: Fit mainstream 246 models, direct replacement, no modification, common inventory.

Technical Parameter Table

Working Principle

• Power input: Servo motor drives spindle gear at high speed (3000–3500rpm), transmitting high-speed, medium-torque power.
• 90° direction change: Spindle bevel gear meshes with driven bevel gear, changing direction by 90°, driving upper/lower shafts.
• Needle bar drive: Upper shaft gear drives needle bar crank, achieving needle bar up/down reciprocation for stitching.
• Feed synchronization: Lower shaft gear drives feed cam and feed gear, synchronously pushing feed dog for uniform stitch length.
• Hook looping: Lower shaft end gear drives hook, looping thread synchronously with needle to form lockstitch.
• Bi-directional stability: Symmetric spur+bevel meshing, balanced forward/reverse loading, no jamming or unilateral wear in reverse.

Main Applications

• 246 machine dedicated: Complete transmission gears for JUKI DSC-246, SW-246 and domestic 246 cylinder-bed flat machines.
• Leather/genuine leather sewing: Handbags, wallets, shoe uppers, belts, sofas, 5–15mm thick materials.
• Bag/handbag production: Curved sewing, small-diameter cylindrical stitching, 25cm working space compatible.
• Heavy material unison feed: Needle+presser foot+feed dog unison feed for multi-layer canvas, denim, synthetic leather.
• Hook drive: Double-capacity hook (246 standard), reducing bobbin change frequency and improving efficiency.
• High-speed servo adaptation: 3000–3500rpm servo motor matching, smooth speed control and low energy consumption.
• Old machine replacement: Complete set replacement for wear, chipping or noise in 246 machines.

Product Advantages

• High-speed stability, no overheating: Compatible with 3500rpm, precision tooth profile + lubrication, temperature rise ≤35℃ in continuous operation.
• Low noise & quiet environment: Precision spur+bevel meshing, noise ≤65dB, 5–8dB quieter than standard gears.
• Wear resistance & cost reduction: HRC 56–62 + deep hardening, life ≥6000 hours, reducing downtime.
• Heavy material toughness, no chipping: Thickened root + high-strength material, no chipping in 8–15mm thick materials.
• Precise transmission & uniform stitches: ISO Grade 7 accuracy, stitch error ≤0.1mm, neat stitches.
• Smooth bi-directional, easy reverse: Symmetric meshing, no jamming or unilateral wear in forward/reverse.
• 246 dedicated, perfect fit: Dimensions, module, ratio fully match 246 machines, plug-and-play.
• Complete replacement & efficient maintenance: Full set one-time replacement, avoiding noise/wear from mixing old/new.

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.