Automotive Double Helical Gear – POM, PA, PEEK, M0.15-M2.2

Automotive double helical gears in engineering plastics bring the mechanical advantages of the herringbone tooth form — axial thrust elimination, high contact ratio, smooth and quiet engagement — to compact, lightweight, corrosion-resistant gear sets for automotive and related applications. The starting example is Φ15 mm at module M0.25 in POM, representative of the small-diameter precision plastic gear sets used in automotive actuator mechanisms, window regulators, seat adjustment drives, and HVAC door actuators.

Korea Ever-Power produces automotive double helical gears across the full specification range: Φ3–Φ120 mm diameter, module M0.15 to M2.2, in POM, PA (Nylon), PPA, PBT, and PEEK. Meshing grades from GB 6 through ISO 6, AGMA 13, and DIN 5–6 cover instrument drives through industrial-grade automotive components. ODM and OEM service, TS16949 and ISO 9001:2008 certification, vacuum tray packaging, and express international delivery by DHL, TNT, FedEx, and UPS.

Smooth and Quiet Operation

Helical teeth distribute the contact pressure gradually along the tooth face, eliminating the impact engagement of spur gears. Automotive interior applications — window regulators, seat drives — are inaudible when properly designed with helical gears; the same mechanism with spur gears would produce an audible whine at the operating speed.

Zero Net Axial Thrust

The double helical form eliminates the axial thrust load that single helical gears impose on shaft bearings. In compact automotive actuator gear trains where shaft support is provided by small bushings rather than rolling element bearings, this thrust elimination directly reduces bushing wear and actuator back-drive friction.

High Contact Ratio

Higher contact ratio distributes the load across more tooth pairs simultaneously, reducing peak load per tooth and extending gear life. In an automotive gear set running millions of cycles over the vehicle service life, higher contact ratio directly translates to longer tooth surface fatigue life and lower noise at operating speed.

High Meshing Grade Accuracy

Meshing grades GB 6, ISO 6, AGMA 13, and DIN 5–6 represent high-accuracy plastic gear production. At DIN 5 accuracy, the transmission error of the plastic gear pair is comparable to that of hobbed metal gears — the noise and vibration advantages of the helical tooth form are fully realised only when the tooth accuracy is adequate to prevent additional noise from pitch and profile errors.

Automotive Actuators

Window regulator drives, seat adjustment mechanisms, HVAC door actuators, sunroof drives, and mirror adjusters — the largest volume application for small-diameter POM and PA automotive double helical gears. TS16949 certification is mandatory for automotive OEM supply.

Medical Devices

Infusion pump drives, surgical instrument actuators, and diagnostic device gear trains. PEEK for implant-adjacent and sterilisable applications; POM or PA for general medical automation. The high meshing grade accuracy (ISO 6, AGMA 13) meets the precision requirement of medical instrument drives.

Military and Aircraft

Precision instrument and control mechanism drives in military electronics and aircraft auxiliary systems. PEEK double helical gears for high-temperature under-deck locations; POM for room-temperature avionics bays. The low radar cross-section of plastic gears is a secondary advantage in certain military applications.

Industrial Automation

Small stepping motor drives, conveyor positioning mechanisms, and pick-and-place robot wrist actuators where the Φ3–Φ120 mm size range, light weight, self-lubrication, and corrosion resistance of plastic double helical gears are all simultaneously required.

Office and Electronic Equipment

Printer paper-feed drives, scanner mechanisms, and photocopier roller drives. The quiet operation of the helical form and the self-lubrication of POM eliminate the gear noise and lubrication maintenance that characterise equivalent spur gear drives in office equipment.

ODM / OEM Export

ODM and OEM production programmes for automotive tier-1 and tier-2 suppliers worldwide. Vacuum tray packaging and express DHL/TNT/FedEx/UPS delivery support just-in-time automotive supply chains in Europe, Japan, South Korea, North America, and Southeast Asia.

What is the smallest module and diameter available for automotive double helical gears?

The standard range starts at Φ3 mm outer diameter and module M0.15 — among the finest-pitch plastic gear production available. At M0.15, the tooth height is approximately 0.34 mm and the pitch circle diameter for 20 teeth is 3 mm, consistent with miniature instrument and sensor actuator drives. Confirm the specific module, tooth count, and material at enquiry stage; very fine-pitch double helical gear production in plastic requires specific tooling confirmation before production commitment.

Which material is recommended for under-bonnet automotive applications?

Under-bonnet temperatures regularly reach 120–150°C at peak and 80–100°C continuously, with exposure to engine oil, coolant, and cleaning fluids. POM and standard PA are not adequate for sustained under-bonnet duty at these temperatures. PPA (polyphthalamide) is the standard automotive choice for under-bonnet plastic gear applications — it withstands 150–170°C continuously and has low moisture absorption compared with standard nylons. PEEK is used where temperatures exceed PPA's capability or where chemical exposure is severe. Korea Ever-Power's engineering team can advise on material selection for specific under-bonnet duty cycles.

What meshing grade corresponds to AGMA 13 in DIN?

AGMA and DIN use inverse numbering systems — higher AGMA number means higher accuracy; higher DIN number means lower accuracy. AGMA 13 is a high accuracy grade approximately equivalent to DIN 5–6. This meshing grade represents the practical accuracy ceiling for injection-moulded plastic gears produced with precision tooling and controlled process parameters. Achieving AGMA 13 / DIN 5 in plastic requires tight control of mould temperature, cooling rate, and gate location to minimise residual stress and dimensional variation. Korea Ever-Power's automotive production process is designed to consistently achieve this accuracy level in POM, PA, PPA, and PBT.

Are ODM services available for automotive double helical gear programmes?

Yes — Korea Ever-Power's ODM service covers gear design, mould design, prototype production, and series production. For automotive OEM customers who have a functional requirement (load, speed, life target, operating temperature) but no finished gear drawing, the Korea Ever-Power engineering team will design the gear geometry and propose the mould concept for customer approval before tooling investment. This service has good knowledge of different automotive market requirements and can meet special requirements for noise level, backlash, and thermal stability specific to each automotive customer's programme specifications.

What packaging and delivery service is used for automotive programme supply?

Automotive double helical gears are vacuum-packed in plastic trays — the vacuum packaging prevents moisture absorption (critical for PA and PPA gears whose dimensions change with moisture content) and protects the gear tooth flanks from contamination and damage during transit. Express international delivery is by DHL, TNT, FedEx, and UPS, supporting just-in-time automotive supply chain delivery windows. For high-volume programmes, sea freight with tray-in-carton packaging is also available. Contact our team to discuss packaging and logistics for your specific programme volume and delivery schedule.

"We supply window regulator mechanisms to an automotive OEM and switched from POM spur gears to POM double helical gears from Korea Ever-Power. The noise level at the OEM's acoustic test bench dropped to below the programme target on the first evaluation sample. TS16949 certification was confirmed at supplier qualification and the vacuum tray packaging prevented the moisture-related bore dimension variation we had experienced with a previous unpackaged supplier."

Kim Dong-hyun  |  Component Engineer, Gyeonggi Automotive Actuator Systems  ·  Q1 2026

"We design surgical robot wrist mechanisms and specified PEEK double helical gears at AGMA 13 from Korea Ever-Power. The PEEK gears passed our autoclave sterilisation cycle test (134°C, 18 minutes, 50 cycles) with no measurable dimensional change. Meshing grade confirmed at incoming CMM check — all gears within AGMA 13 tolerance."

Lee Hyeon-seo  |  Robotics Component Engineer, Seoul Surgical Systems  ·  Q3 2025

"We manufacture under-bonnet throttle position actuators and needed PPA double helical gears at M0.5, Φ25 mm for a 140°C continuous duty cycle. Korea Ever-Power confirmed PPA was appropriate for the temperature, produced samples within the stated lead time, and provided the material data sheet confirming the thermal properties. Series production has run for 14 months with no field returns related to gear performance."

Park Seon-min  |  Powertrain Actuator Engineer, Incheon Automotive Electronics  ·  Q4 2025

"We used Korea Ever-Power's ODM service for a new seat adjustment mechanism — we had the packaging space and load requirement but no gear drawing. Their engineering team designed the gear geometry, proposed the DIN 6 accuracy target, and produced the mould concept within our development schedule. First-off samples confirmed to drawing at our incoming check. The vacuum tray packaging allows us to store parts for 6 months without moisture-related bore swelling."

Choi Tae-yang  |  Interior Systems Development Engineer, Daejeon Automotive Interiors  ·  Q2 2026

"We import automotive plastic double helical gears for distribution to aircraft interior mechanism suppliers. AGMA 13 confirmed by CMM at our incoming inspection on every batch. Express FedEx delivery meets our just-in-time delivery window requirement. ISO 9001:2008 and TS16949 certificates provided with the first delivery and updated copies provided at each certification renewal."

Yoon Ji-su  |  Precision Parts Import Manager, Busan Aerospace Components Trading  ·  Q1 2025