China Metal Helical Pinion Sets Manufacturer, Supplier, Factory

In precision drive engineering, the choice of pinion and wheel directly affects mesh efficiency, thermal stability, and long-term wear performance. Helical tooth geometry offers progressive contact engagement, which lowers impact loading when compared with straight-cut gears and makes the system suitable for reversing or high-cycle operations. The current product range is organized into four categories: Steel Helical Gear Components for standardized gearbox replacements, Alloy Helical Transmission Gears for high-torque drivetrains, Metallic Helical Gear Wheels for continuous-duty conveying and mixing systems, and Industrial Helical Metal Gear Parts for heavy machinery and retrofit projects. The following parameters represent the standard production envelope and are verified by in-house metrology before dispatch. For original equipment manufacturers and maintenance teams, these standardized dimensional envelopes reduce design lead time and allow direct replacement of worn gears without changing housing geometry.

• Material options: 20CrMnTi, 42CrMo, 40CrNiMo, 17-4PH stainless steel; carburizing depth 0.8–1.4 mm for case-hardened grades
• Tooth geometry: involute helical profile, 20° normal pressure angle, 10°–30° helix angle, left-hand or right-hand orientation
• Module range: 0.8–8 mm; pinion teeth: 9–45; wheel teeth: 20–200; single-stage ratio from 1:1 to 6:1
• Accuracy class: DIN 3962 grade 6–8, AGMA 2000-A88 class 8–10, total profile deviation ≤ 10 µm on ground flanks
• Heat treatment: carburizing, induction hardening, nitriding, or carbonitriding; surface hardness 55–62 HRC, core hardness 30–42 HRC
• Mounting configuration: plain bore with keyway per DIN 6885, H7 tolerance, optional shrink disc, taper bushing, or integral shaft
• Additional features: tip relief, longitudinal crowning, shot peening on request, and anti-rust protective coating

Metal Helical Pinion Sets are produced as matched pairs with traceable set numbers to maintain exact center-distance control and uniform contact patterns across the full face width. Manufacturing starts with forged or rolled billet stock, followed by normalizing, rough turning, CNC hobbing, heat treatment, finish boring, and profile grinding or honing. Pinions intended for high-speed use are induction-hardened by single-shot or scanning processes, then ground on the bore, journal diameters, and tooth flanks in a single setup to minimize runout. Case-carburized sets are treated to a controlled case depth of approximately 0.1–0.2 times the module and tempered to relieve grinding stress. Each tooth flank receives tip relief and longitudinal crowning, which reduces edge loading when the housing deflects under load and keeps the contact ellipse close to the center of the face width. The standard surface finish on ground flanks is Ra 0.4–0.8 µm, while the bore is finished to H7 or IT5 depending on the speed requirement. Runout of the pitch circle relative to the bore is held to 0.02 mm or better, and the tooth root fillet can be shot-peened to increase bending fatigue strength by approximately 15–20 percent. Splined bores, keyways, and set-screw flats are machined after final hardening to preserve their positional relationship to the gear teeth. The maximum operating temperature is 150°C for standard alloy grades and 200°C for nitrided versions. Lubrication cross-drilled holes and axial oil grooves can be added for continuous oil supply in high-speed gearboxes. Metal Helical Pinion Sets are suitable for servo drives, rack-and-pinion actuators, agricultural transmissions, packaging lines, and industrial automation axes where low backlash and repeatable positioning are required. Standard delivery includes a dimensional inspection report, material certification, and anti-rust packaging in VCI film. Optional dynamic balancing to ISO 1940 G1, magnetic particle inspection, and ultrasonic testing of the tooth root region are available for critical installations. The gear sets are inspected on Klingelnberg P-series or Zeiss Contura machines, and measurements include involute form, helix angle, tooth thickness, tip diameter, and base tangent length. Each batch is checked for material hardness with a Rockwell tester and for case depth with a Vickers microhardness traverse. All test reports are archived by serial number and can be supplied with the shipment. Standard pinion shafts are stress-relieved after rough machining, and the journals are ground to a circularity of 1.5 µm for speeds above 2,000 rpm. Balancing is performed on two-plane machines, and corrections are applied by drilling or milling the gear body without affecting the tooth load rating. Coating and plating options include black oxide, phosphate, and electroless nickel for corrosive environments. The overlapping contact ratio of the helical mesh, typically 1.8–2.4, distributes the transmitted load over multiple teeth and reduces peak stress at the root. This results in lower noise, smoother torque transfer, and longer service intervals in continuous or reversing applications.