{"id":1746,"date":"2026-07-17T06:30:50","date_gmt":"2026-07-17T06:30:50","guid":{"rendered":"https:\/\/gearrack.top\/product\/plastic-helical-gear\/"},"modified":"2026-07-17T06:30:59","modified_gmt":"2026-07-17T06:30:59","slug":"plastic-helical-gear","status":"publish","type":"product","link":"https:\/\/gearrack.top\/fr\/product\/plastic-helical-gear\/","title":{"rendered":"Plastic Helical Gear"},"content":{"rendered":"
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<\/p>\n

Product Overview<\/h2>\n
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\n \"Plastic\n <\/div>\n
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Plastic helical gears<\/strong> have teeth cut at an angle to the gear axis \u2014 the helix angle \u2014 making them quieter, smoother, and capable of higher contact ratios than spur gears of the same module. The meshing between two plastic helical gears is smoother and quieter than spur gears because the angled teeth engage gradually: when two teeth on the gear mesh, contact starts at one end of the tooth and spreads progressively along the tooth face as the gear rotates, until both teeth are fully engaged \u2014 then contact withdraws gradually from the other end. This gradual engagement eliminates the abrupt load impulse of spur gear tooth contact and produces the characteristic smooth, quiet operation of helical gears. Korea Ever-Power’s plastic helical gears are available in POM (Polyacetal) and Nylon, module M0.1\u2013M2.0, OD \u00d810\u2013\u00d850 mm, bore \u00d81.40\u2013\u00d83.05 mm, face width 2\u201310 mm.<\/p>\n

Korea Ever-Power’s plastic helical gears<\/a> meet all kinds of needs for laser printers, digital cameras, scanners, CD-ROMs, stepping motors, medical equipment, vending machines, gear pumps, household appliances, fax machines, IP cameras, and other specialised products requiring transmission design. Custom gears per drawing or sample; prototype testing before mould making.<\/p>\n<\/p><\/div>\n<\/div>\n

<\/p>\n

\n
\"Custom<\/p>\n

Custom Nylon Helical<\/p>\n<\/div>\n

\"Nylon<\/p>\n

Helical Pinion<\/p>\n<\/div>\n

\"High<\/p>\n

Precision Hobbed Nylon<\/p>\n<\/div>\n<\/div>\n

<\/p>\n

Technical Specifications<\/h2>\n
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Standard Specification Range<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n
Parameter<\/th>\nGamme<\/th>\n<\/tr>\n<\/thead>\n
Taper<\/td>\nPlastic Helical Gear<\/td>\n<\/tr>\n
Module<\/td>\nM0.1 \u2013 M2.0<\/td>\n<\/tr>\n
Mat\u00e9riel<\/td>\nPOM (Polyacetal) \/ Nylon<\/td>\n<\/tr>\n
Bore<\/td>\n\u00d81.40 \/ 1.90 \/ 2.05 \/ 2.40 \/ 2.55 \/ 2.90 \/ 3.05 mm (flexible)<\/td>\n<\/tr>\n
Outer Diameter<\/td>\n\u00d810.0 mm \u2013 \u00d850.0 mm (flexible)<\/td>\n<\/tr>\n
Face Width (L)<\/td>\n2.0 mm \u2013 10.0 mm (flexible)<\/td>\n<\/tr>\n
Helix Angle<\/td>\nPer customer specification (typically 10\u00b0\u201330\u00b0)<\/td>\n<\/tr>\n
Hand<\/td>\nRH or LH per drawing<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n
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Example Products<\/p>\n\n\n\n\n\n\n\n\n
Item<\/th>\nDetail<\/th>\n<\/tr>\n<\/thead>\n
Product A<\/td>\nD-Hole Helical Gear, POM, M0.6, 16T, 0.95 g \u2014 camera\/printer drives<\/td>\n<\/tr>\n
Product B<\/td>\nODM helical gear \u2014 IP camera \/ monitor application, custom specification<\/td>\n<\/tr>\n
Surface<\/td>\nAs-moulded (smooth tooth surface); CNC-hobbed for higher precision<\/td>\n<\/tr>\n
Prototype<\/td>\nMachined \/ handmade before mould \u2014 test in application first<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<\/div>\n

<\/p>\n

Helical Gear Principles \u2014 Why Angled Teeth Matter<\/h2>\n

\"Custom<\/p>\n

The helical gear’s inclined teeth give it fundamentally different meshing characteristics from spur gears \u2014 and these differences are especially significant in plastic gear applications:<\/p>\n

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Gradual Tooth Engagement<\/h3>\n

The helix angle causes tooth contact to begin at one end of the tooth face and sweep progressively across the full face width as the gear rotates. At any instant during meshing, only a diagonal band of tooth surface is in contact \u2014 not the full face width simultaneously (as in spur gears). This gradual engagement distributes the tooth load across a longer contact line, reduces the load impulse at tooth engagement, and produces the smoother, quieter operation that defines helical gears. For plastic helical gears, this smoothness reduces the peak stress at the mould-formed tooth surface and extends fatigue life compared with equivalent spur gears.<\/p>\n<\/p><\/div>\n

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Higher Contact Ratio<\/h3>\n

The helical gear’s total contact ratio \u03b5_total = \u03b5_transverse + \u03b5_overlap is higher than for the equivalent spur gear. The overlap ratio \u03b5_overlap = b\u00b7sin(\u03c8) \/ (\u03c0\u00b7m_n) increases with face width b and helix angle \u03c8 \u2014 adding to the transverse contact ratio. A typical plastic helical gear at M0.6, 16T, with 15\u00b0 helix angle and 5 mm face width achieves \u03b5_total \u2248 1.8\u20132.2, compared with \u03b5 \u2248 1.5 for the equivalent spur gear. This higher contact ratio means more tooth pairs simultaneously share the transmitted load \u2014 reducing the peak force per tooth and extending service life.<\/p>\n<\/p><\/div>\n

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Helix Angle and Noise Reduction<\/h3>\n

Increasing the helix angle increases the overlap ratio, which increases smoothness and reduces noise \u2014 but also increases the axial thrust force on the gear shaft. For plastic helical gears, typical helix angles are 10\u00b0\u201320\u00b0 \u2014 providing meaningful noise reduction over spur gears (2\u20135 dB(A) additional reduction beyond the inherent plastic damping advantage) without generating excessive axial force on the thin plastic shaft bosses. At 30\u00b0+ helix angles, the axial force requires careful plastic housing design to prevent deflection at the shaft support.<\/p>\n<\/p><\/div>\n

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Axial Thrust Force \u2014 A Unique Challenge<\/h3>\n

Unlike spur gears, helical gears produce an axial thrust force F_a = F_t \u00d7 tan(\u03c8) \u2014 where F_t is the tangential tooth force and \u03c8 is the helix angle. This force acts along the gear shaft axis and must be reacted by the shaft bearings. In plastic gear mechanisms, the shaft bearings are often simple moulded bosses in the plastic housing \u2014 and these plastic bosses have much lower axial load capacity than steel bearings. The helical gear design must limit helix angle to keep the axial force within the plastic housing’s structural capacity.<\/p>\n<\/p><\/div>\n

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Injection Mould Design for Helical Gears<\/h3>\n

Helical gear injection moulds are more complex than spur gear moulds. A spur gear can be ejected axially from the mould after the die opens (straight pull). A helical gear tooth has an undercut in the axial direction \u2014 it cannot be ejected straight out. The mould must incorporate a rotating\/unscrewing mechanism that rotates the gear as it is ejected, advancing it along the helix of the teeth until it clears the mould. This mechanical unscrewing mechanism increases mould cost compared with straight-pull spur gear moulds \u2014 one reason spur gears remain preferred for high-volume plastic gear applications when noise performance is adequate.<\/p>\n<\/p><\/div>\n

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Normal vs Transverse Module<\/h3>\n

For helical gears, the module can be specified in two ways: normal module m_n (measured perpendicular to the tooth flanks) and transverse module m_t = m_n \/ cos(\u03c8) (measured in the plane of rotation). The normal module m_n is the standard specification \u2014 the hob or mould cutter works in the normal plane. For two helical gears to mesh, they must have the same normal module and pressure angle, but the helix angles may differ (for crossed-helical gears) or must be equal and opposite (for parallel-axis helical gears). Korea Ever-Power specifies all plastic helical gears by normal module for unambiguous quotation.<\/p>\n<\/p><\/div>\n<\/div>\n

<\/p>\n

Plastic Helical vs Plastic Spur Gear \u2014 Which to Choose?<\/h2>\n

\"Ever-Power<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n
Factor<\/th>\nPlastic Helical Gear \u2605<\/th>\nPlastic Spur Gear<\/th>\n<\/tr>\n<\/thead>\n
Noise level<\/td>\nLower \u2014 gradual tooth engagement \u2713<\/td>\nModerate \u2014 abrupt full-face engagement<\/td>\n<\/tr>\n
Contact ratio<\/td>\nHigher (transverse + overlap) \u2713<\/td>\nTransverse only<\/td>\n<\/tr>\n
Load capacity<\/td>\nHigher (more tooth pairs in contact) \u2713<\/td>\nLower<\/td>\n<\/tr>\n
Axial force on shaft<\/td>\nYes \u2014 requires axial thrust constraint<\/td>\nNone \u2713 \u2014 simple radial bearings only<\/td>\n<\/tr>\n
Mould complexity<\/td>\nHigher \u2014 unscrewing mechanism required<\/td>\nLower \u2014 straight-pull ejection \u2713<\/td>\n<\/tr>\n
Tooling cost<\/td>\nHigher<\/td>\nLower \u2713<\/td>\n<\/tr>\n
Best application<\/td>\nNoise-sensitive drives, higher-speed, camera\/monitor pan\/tilt<\/td>\nHigh-volume, cost-sensitive, positioning accuracy<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

<\/p>\n

Applications<\/h2>\n

\"measuring<\/p>\n

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<\/div>\n

IP Cameras and Monitors<\/h3>\n

POM D-hole helical gears (M0.6, 16T, 0.95 g) in IP camera pan\/tilt head drives. The helical gear’s gradual tooth engagement is critical in camera drives \u2014 any gear mesh impulse causes image blur at the moment of direction reversal in pan-tilt scanning modes. The lower noise also meets the acoustic requirements of broadcast studio and home surveillance environments where camera motor noise is unacceptable.<\/p>\n<\/div>\n

\n
\ufe0f<\/div>\n

Printers and Scanners<\/h3>\n

POM helical gears in high-speed laser printer paper feed drives and flatbed scanner carriage drives. At high print speeds (pages per minute), the printer gear train reaches significant RPM \u2014 the helical gear’s superior noise performance at speed keeps the printer acoustic output within office environment acoustic standards. The higher contact ratio also improves torque capacity in the main drive train for paper-handling at maximum print speed.<\/p>\n<\/div>\n

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<\/div>\n

Robots and Automation<\/h3>\n

Nylon helical gears in small robot joint drives, servo actuator gear heads, and automation positioning stages. For robot joint drives, the helical gear’s higher load capacity per unit size allows more torque to be transmitted through a smaller gear pair \u2014 reducing robot joint mass and moment of inertia. The lower mesh noise also suits domestic and collaborative robot applications where human proximity makes gear noise a user experience issue.<\/p>\n<\/div>\n

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<\/div>\n

Automotive Actuators<\/h3>\n

PA66 glass-filled helical gears in automotive electric window lift, mirror actuator, and seat adjustment drives. Automotive plastic helical gears must maintain dimensional stability and load capacity across \u221240\u00b0C to +85\u00b0C temperature range in typical automotive cabin environments. Glass-fibre-reinforced PA66 provides the higher stiffness and heat resistance needed at the upper end of this temperature range, while maintaining adequate toughness at cold temperatures to resist impact loading from door slams.<\/p>\n<\/div>\n

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\u2699\ufe0f<\/div>\n

Gear Pumps<\/h3>\n

POM helical gears in chemical-resistant gear pumps where lower pulsation than spur gear pumps is required. The helical gear pump’s gradually-varying displacement volume (from the progressive tooth engagement) produces lower pressure pulsation than spur gear pumps \u2014 important for precision dosing and metering applications where pulsation affects dispensing accuracy.<\/p>\n<\/div>\n

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<\/div>\n

Medical Devices<\/h3>\n

POM helical gears in medical device drives where noise is a primary requirement \u2014 patient-worn and beside-bed devices must be as quiet as possible during nighttime use. A surgical infusion pump or CPAP machine’s gear drive must be below 35 dB(A) in a quiet ward; the helical gear’s inherent noise reduction versus spur gears, combined with POM’s material damping, achieves the target noise levels in these demanding acoustic environments.<\/p>\n<\/div>\n<\/div>\n

<\/p>\n

Frequently Asked Questions<\/h2>\n
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Why are plastic helical gears quieter than plastic spur gears?<\/p>\n

Plastic helical gears are quieter for two reasons: first, the gradual tooth engagement (contact line sweeps across the face rather than engaging all at once) reduces the load impulse at tooth engagement that is the primary source of gear mesh noise in spur gears. Second, the higher contact ratio means more tooth pairs are in contact simultaneously, distributing the load and reducing the load variation per tooth as teeth enter and leave mesh \u2014 this load variation is what drives the vibration that produces gear noise. Combined with plastic’s inherent damping properties, plastic helical gears achieve the lowest noise levels of any plastic gear type.<\/p>\n<\/div>\n

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What does “D-hole” mean in a plastic helical gear specification?<\/p>\n

A D-hole (also called D-cut bore or flat-on-round bore) is a circular bore with a flat chord cut on one side \u2014 like the letter D. When a D-hole gear is mounted on a shaft with a matching D-cross-section, the flat prevents the gear from rotating on the shaft \u2014 providing positive rotational alignment without a keyway or set screw. The D-hole is widely used in small plastic gears for camera, printer, and instrument drives where the torque is too low to require a full keyway but the flat provides reliable angular alignment during assembly. Korea Ever-Power moulds D-hole bore gears directly \u2014 no secondary machining required.<\/p>\n<\/div>\n

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Can I test a plastic helical gear prototype before committing to mould tooling?<\/p>\n

Yes \u2014 Korea Ever-Power provides handmade \/ machined custom helical gear prototypes before mould making so tests can be done first. CNC hobbing of a helical gear from POM or Nylon rod is possible in small quantities (1\u201310 pcs) within a few days, allowing functional testing of helix angle, contact pattern, noise level, and tooth strength before the mould tooling investment is committed. Contact Korea Ever-Power<\/a> with your gear specification to begin.<\/p>\n<\/div>\n<\/div>\n

<\/p>\n

Customer Reviews<\/h2>\n
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\n

“We produce network cameras and source POM D-hole helical gears (M0.6, 16T, 0.95 g) from Korea Ever-Power for our pan\/tilt drives. Noise during full-speed pan sweep: 28 dB(A) at 0.5 m \u2014 7 dB below our acoustic spec. Image steadiness at direction reversal: no visible blur at 4K\/30fps \u2014 confirmed by our image quality test rig. Mould lead time: 16 days. Dimensional repeatability: 100 consecutive shots from same mould, all within \u00b10.01 mm on critical OD dimension.”<\/p>\n

Kim Dong-hyeon<\/strong>  |  Camera Module Engineer, Incheon Network Surveillance Co.  ·  Q2 2026<\/em><\/p>\n<\/div>\n

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“We build collaborative robots and evaluated Korea Ever-Power Nylon helical gears for our wrist joint drive against POM spur gears. Noise difference: 6 dB(A) lower for the helical gear at 120 RPM joint speed. Torque capacity comparison: helical gear handles 18% more torque before audible tooth slip. Prototype delivery for testing: 3 days from drawing to parts. Chose helical for the final design. Now in series production with Korea Ever-Power, 2,000 gear sets quarterly.”<\/p>\n

Lee Byeong-woo<\/strong>  |  Collaborative Robot Drive Engineer, Gyeonggi Robotics Co.  ·  Q4 2025<\/em><\/p>\n<\/div>\n<\/div>\n

<\/p>\n

Related Products<\/h2>\n
\n
\"Plastic<\/a><\/p>\n
\n

Plastic Gears<\/h3>\n

All plastic gear types \u2014 POM, Nylon, MC Nylon.<\/p>\n

Browse \u2192<\/a><\/div>\n<\/div>\n

\"Spur<\/a><\/p>\n
\n

Steel Spur Gears<\/h3>\n

Steel spur gears \u2014 all modules and materials.<\/p>\n

Browse \u2192<\/a><\/div>\n<\/div>\n

\"Helical<\/a><\/p>\n
\n

Steel Helical Gears<\/h3>\n

Steel helical gears for high-load parallel drives.<\/p>\n

Browse \u2192<\/a><\/div>\n<\/div>\n

\"Engrenages<\/a><\/p>\n
\n

Engrenages coniques<\/h3>\n

Bevel and spiral bevel for right-angle drives.<\/p>\n

Browse \u2192<\/a><\/div>\n<\/div>\n

\"Worm<\/a><\/p>\n
\n

Worm Gears<\/h3>\n

Brass worm wheels, stainless worm gears.<\/p>\n

Browse \u2192<\/a><\/div>\n<\/div>\n

\"Ring<\/a><\/p>\n
\n

Ring Gears<\/h3>\n

Aerospace, wind turbine, automotive ring gears.<\/p>\n

Browse \u2192<\/a><\/div>\n<\/div>\n

\"Planetary<\/a><\/p>\n
\n

Planetary Gears<\/h3>\n

Ring gears, internal kits, planetary gear sets.<\/p>\n

Browse \u2192<\/a><\/div>\n<\/div>\n

\"Other<\/a><\/p>\n
\n

Other Gears<\/h3>\n

Gear rack, auto, herringbone, hypoid, crown, forklift.<\/p>\n

Browse \u2192<\/a><\/div>\n<\/div>\n<\/div>\n

\n

Request a Quotation for Plastic Helical Gears<\/h3>\n

POM and Nylon. M0.1\u2013M2.0. \u00d810\u201350 mm OD. D-hole and through-bore. RH\/LH helix. Camera, printer, robot, medical, automotive. Prototype before mould. Custom helix angle and specification per drawing.<\/p>\n

Get a Quote Now<\/a>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"

Custom Plastic Helical Gear from Korea Ever-Power \u2014 Hangzhou plastic gear manufacturer. POM, MC Nylon, PA66, PEEK, UHMWPE. ISO9001, SGS, FDA, RoHS certified. Custom size, colour, material. 24hr quote.<\/p>","protected":false},"featured_media":1747,"comment_status":"closed","ping_status":"open","template":"","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":""},"product_brand":[],"product_cat":[4565],"product_tag":[],"class_list":["post-1746","product","type-product","status-publish","has-post-thumbnail","product_cat-plastic-geat","pa_editor-cxm","first","instock","product-type-simple"],"_links":{"self":[{"href":"https:\/\/gearrack.top\/fr\/wp-json\/wp\/v2\/product\/1746","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/gearrack.top\/fr\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/gearrack.top\/fr\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/gearrack.top\/fr\/wp-json\/wp\/v2\/comments?post=1746"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/gearrack.top\/fr\/wp-json\/wp\/v2\/media\/1747"}],"wp:attachment":[{"href":"https:\/\/gearrack.top\/fr\/wp-json\/wp\/v2\/media?parent=1746"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/gearrack.top\/fr\/wp-json\/wp\/v2\/product_brand?post=1746"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/gearrack.top\/fr\/wp-json\/wp\/v2\/product_cat?post=1746"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/gearrack.top\/fr\/wp-json\/wp\/v2\/product_tag?post=1746"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}