{"id":1752,"date":"2026-07-17T06:30:50","date_gmt":"2026-07-17T06:30:50","guid":{"rendered":"https:\/\/gearrack.top\/product\/plastic-double-spur-gear\/"},"modified":"2026-07-17T06:36:53","modified_gmt":"2026-07-17T06:36:53","slug":"plastic-double-spur-gear","status":"publish","type":"product","link":"https:\/\/gearrack.top\/ko\/product\/plastic-double-spur-gear\/","title":{"rendered":"Plastic Double Spur Gear"},"content":{"rendered":"
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<\/p>\n

Product Overview<\/h2>\n
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\"Plastic<\/div>\n
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A plastic double spur gear<\/strong> is a compound gear with two sets of spur teeth on a single hub body \u2014 one gear on each level of the two-stage compound gear. The two sets of teeth have different tooth counts (and often different modules for the two stages), so the double gear simultaneously meshes with two other gears: the larger gear receives input from the previous stage, and the smaller gear drives the next stage. This two-ratios-in-one-body design eliminates one bearing shaft in the gear train, saves housing space, and reduces the total part count compared with two separate gears on separate shafts. Korea Ever-Power’s plastic double spur gears are available in PA, POM, UHMWPE, ABS, PTFE, PPS, and PEEK, modules M1\u2013M12, to ISO\/DIN\/ANSI\/JIS standards, precision DIN6\u2013DIN9.<\/p>\n

Korea Ever-Power’s plastic double spur gears<\/a> are used in robotics, toys, small machinery, medical devices, printers, cameras, and office automation \u2014 wherever a compact two-stage speed reduction must fit in a minimum housing volume without an intermediate shaft. Sample lead time: 20 business days. Bulk: 25 business days. Custom per drawing or sample.<\/p>\n<\/div>\n<\/div>\n

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\"POM<\/p>\n

POM Compound<\/p>\n<\/div>\n

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\"Custom<\/p>\n

Custom Multi-Stage<\/p>\n<\/div>\n

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\"Plastic<\/p>\n

Complete Gear Set<\/p>\n<\/div>\n<\/div>\n

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Technical Specifications<\/h2>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Parameter<\/th>\n\uc0ac\uc591<\/th>\n<\/tr>\n<\/thead>\n
Module<\/td>\nM1, M1.5, M2, M2.5, M3, M4, M5, M8, M12 and others<\/td>\n<\/tr>\n
\uc7ac\ub8cc<\/td>\nPA, POM, UHMWPE, ABS, PTFE, PPS, PEEK<\/td>\n<\/tr>\n
Standard<\/td>\nISO, DIN, ANSI, JIS, BS, Non-standard<\/td>\n<\/tr>\n
Precision<\/td>\nDIN6, DIN7, DIN8, DIN9<\/td>\n<\/tr>\n
Teeth Treatment<\/td>\nHardened, Milled, or Ground<\/td>\n<\/tr>\n
Tolerance<\/td>\n0.001 mm \u2013 0.01 mm \u2013 0.1 mm<\/td>\n<\/tr>\n
Double Gear Feature<\/td>\nTwo tooth sets on one hub \u2014 large gear (input) + small gear (output); two-stage reduction without intermediate shaft<\/td>\n<\/tr>\n
Sample Lead Time<\/td>\n20 business days<\/td>\n<\/tr>\n
Bulk Lead Time<\/td>\n25 business days<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

<\/p>\n

How Plastic Double Spur Gears Work<\/h2>\n

\"Manufacturers<\/p>\n

The double spur gear \u2014 also called a compound gear or step gear \u2014 is a two-ratio gear in a single moulded body. Understanding its geometry explains why it is so widely used in compact plastic gear trains:<\/p>\n

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Two Gear Stages, One Body<\/h3>\n

The double spur gear has a large-diameter gear (Z\u2081 teeth) and a small-diameter gear (Z\u2082 teeth) on the same hub, rotating together on the same shaft at the same angular velocity. The large gear meshes with the motor gear (or previous stage), receiving input rotation. The small gear simultaneously meshes with the next stage’s large gear, transmitting the rotation at the compound gear’s fixed angular velocity. The overall ratio of the double gear stage is (input gear teeth \/ Z\u2081) \u00d7 (Z\u2082 \/ next stage gear teeth) \u2014 two ratios combined in one intermediate stage without a dedicated shaft bearing for the intermediate shaft.<\/p>\n<\/div>\n

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Bidirectional Power Transmission<\/h3>\n

The plastic double spur gear configuration allows power transmission in both directions \u2014 clockwise or counter-clockwise input produces the same gear train output with reversed direction. This bidirectional capability increases the efficiency of the gear system since it enables power to be transmitted in both directions through the same gear train without any switching mechanism. In printer paper feed trains, the same double spur gear set drives forward paper advance and reverse paper return; in camera pan drives, it drives both left pan and right pan from the same motor reversing direction.<\/p>\n<\/div>\n

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Space Saving \u2014 One Shaft Eliminated<\/h3>\n

A two-stage gear train using separate gears requires three shafts (motor, intermediate, output) and two sets of bearings. The double spur gear eliminates the intermediate shaft and its bearings \u2014 the compound body carries both the receiving and transmitting gears on a single boss\/shaft. This shaft elimination reduces the axial depth and radial envelope of the gear train, enabling it to fit within the compact housing of printers, cameras, and small appliances where every cubic millimetre of housing space is allocated by the product designer.<\/p>\n<\/div>\n

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Ratio Flexibility<\/h3>\n

The double spur gear’s two tooth counts (Z\u2081 large gear, Z\u2082 small gear) can be independently specified to achieve the required stage ratio. By choosing Z\u2081 and Z\u2082 independently, the designer has complete freedom in the ratio each double gear stage contributes to the overall train ratio \u2014 while keeping the axial distance between stages constant (set by the double gear hub design). Multiple double gears in series (three or four stages) can achieve total ratios of 100:1 to 1,000:1 in printer paper path drives, camera zoom mechanisms, and instrument clock drives.<\/p>\n<\/div>\n

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Moulding Considerations<\/h3>\n

Plastic double spur gears are injection-moulded in a single operation \u2014 both the large and small gear tooth sets are formed simultaneously in the same die. This requires the mould to have two different gear tooth cavities at different diameters, both accurately positioned relative to the same centre axis. The single-shot moulding ensures perfect coaxiality between the two gear levels \u2014 a critical requirement, since any runout between the two tooth levels causes the gear to wobble on its shaft boss, degrading the meshing of both stages simultaneously.<\/p>\n<\/div>\n

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Compound Gear Printer Example<\/h3>\n

Korea Ever-Power’s classic example: M0.7 double spur gear with 24T large gear and 52T small gear (Delrin 500P, 6.47 g). In the printer drive train, the motor’s small steel gear meshes the 24T large gear (24:motor ratio), then the 52T small gear meshes the paper feed roller gear (paper feed ratio \u00d7 52\/motor). The total ratio is the product of both stages \u2014 achieved in a single 6.47 g POM body that fits in the printer mechanism without an intermediate shaft pin.<\/p>\n<\/div>\n<\/div>\n

<\/p>\n

Eight Advantages of Plastic Double Spur Gears<\/h2>\n

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

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\u2460 Low Cost<\/h3>\n

One double spur gear replaces two single gears plus one intermediate shaft, two shaft support bosses, and one set of alignment features \u2014 all in a single moulded part. This part count reduction lowers the assembly cost per unit more than the slightly higher mould cost for the compound double body. At high production volumes (printer, camera, toy), the cost saving per unit is significant.<\/p>\n<\/div>\n

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\u2461 Lightweight<\/h3>\n

Plastic double spur gears are lighter than equivalent metal gears \u2014 and lighter than two separate plastic single gears of the same stages, because the shared hub eliminates material at the shaft connection. For hand-held devices (cameras, power tools, portable medical equipment) where every gram affects user ergonomics, the compound double gear is a reliable path to weight reduction in the drive mechanism.<\/p>\n<\/div>\n

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\u2462 Corrosion Resistance<\/h3>\n

POM and nylon double spur gears are inherently corrosion-resistant \u2014 no surface treatment is needed. In food processing equipment, medical devices, outdoor solar drives, and marine applications, this corrosion immunity is essential and difficult to achieve reliably with metal gears (requiring plating or stainless steel at much higher cost).<\/p>\n<\/div>\n

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\u2463 Noise Reduction<\/h3>\n

Plastic double spur gears generate less noise than equivalent metal gears \u2014 from the inherent damping properties of POM and nylon. In consumer electronics and office automation (printers, cameras, appliances), the lower gear mesh noise of plastic double spur gears contributes to the acoustic design compliance of the overall product without requiring special acoustic enclosures.<\/p>\n<\/div>\n

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\u2464 Self-Lubricating<\/h3>\n

POM and nylon double spur gears run without grease or oil lubrication in their normal operating load range \u2014 eliminating maintenance and contamination risk. In sealed printer mechanisms, camera housings, and medical equipment where access for re-lubrication is impossible, the self-lubricating plastic double gear is the only practical choice.<\/p>\n<\/div>\n

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\u2465 Easy to Manufacture<\/h3>\n

Injection moulding the double spur gear in a single shot produces both tooth levels simultaneously with precise coaxiality \u2014 something that would be difficult and expensive to achieve by assembling two separate gears on one shaft (requiring press-fitting, keying, or moulding-over). The mould cost is only marginally higher than for a single spur gear, while the assembly cost saving over using two separate gears is substantial.<\/p>\n<\/div>\n

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\u2466 Good Wear Resistance<\/h3>\n

POM and nylon double spur gear materials have good wear resistance under the normal operating conditions for which plastic gears are designed. The low friction coefficient, combined with the self-lubricating property, minimises tooth face wear over the millions of cycles typical of printer and camera mechanism lifetimes. Korea Ever-Power’s life test data for POM double spur gears in printer applications shows consistent tooth profile within tolerance after 5 million cycles.<\/p>\n<\/div>\n

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\u2467 Bidirectional Power<\/h3>\n

The double spur gear configuration transmits power in both rotation directions \u2014 the drive motor simply reverses to achieve both forward and reverse output through the same gear train. This bidirectional capability without additional mechanism is essential in paper feed drives (advance and return), camera drive mechanisms (left and right pan, zoom in and out), and adjustable seat\/mirror actuators (extend and retract).<\/p>\n<\/div>\n<\/div>\n

<\/p>\n

\uc751\uc6a9 \ud504\ub85c\uadf8\ub7a8<\/h2>\n

\"measuring<\/p>\n

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<\/div>\n

Robotics<\/h3>\n

POM and nylon double spur gear stages in small robot joint drive trains and gripper mechanisms. The compact two-stage reduction in one part reduces the number of motor-to-joint drive components in each robot axis, minimising joint mass and moment of inertia \u2014 critical for dynamic performance in collaborative and educational robots where the arm must be lightweight for safe human coexistence.<\/p>\n<\/div>\n

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<\/div>\n

Toys and Entertainment<\/h3>\n

ABS and nylon double spur gears in battery-powered toys, RC vehicles, and educational robot kits. In toy drives, the low cost, lightweight, and self-lubricating properties of plastic double spur gears exactly match the design requirements \u2014 and the bidirectional capability is essential in RC vehicles and toy robots that must both move forward and reverse. At toy price points, the part count saving of the double gear vs two separate gears is decisive.<\/p>\n<\/div>\n

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\ufe0f<\/div>\n

Printers and Office Equipment<\/h3>\n

The classic application: POM M0.7 double spur gears (24T + 52T, Delrin 500P, 6.47 g) in laser printer paper feed trains. Multiple double spur gears in series create the paper advance gear train from motor to feed roller \u2014 each stage a compact double gear body, with the total train fitting in the 5\u20138 mm axial depth of the printer mechanism. Bidirectional transmission enables paper feed and reverse-feed in the same gear train.<\/p>\n<\/div>\n

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Medical Equipment<\/h3>\n

POM double spur gears in medical device drive mechanisms \u2014 infusion pump feed drives, diagnostic instrument positioning stages, and surgical instrument actuators. Medical device double spur gears must meet biocompatibility requirements (POM FDA-listed), particle cleanliness (no lubricant contamination), and long service life at specified duty cycles. Korea Ever-Power can provide material certification documentation for medical device qualification.<\/p>\n<\/div>\n

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\u2600\ufe0f<\/div>\n

Solar Energy Equipment<\/h3>\n

UV-stabilised nylon double spur gears in single-axis and dual-axis solar tracker drive trains. The bidirectional capability enables the tracker to follow the sun from east to west (forward) and return to east before sunrise (reverse) \u2014 in the same lightweight, maintenance-free plastic double gear train.<\/p>\n<\/div>\n

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\ufe0f<\/div>\n

Parking Systems<\/h3>\n

MC Nylon double spur gears in automated parking system platform drive trains and ticket barrier mechanism drives. The higher load capacity of MC Nylon suits the heavier loads in parking equipment compared with office automation applications, while the self-lubricating and corrosion-resistant properties suit the outdoor and underground parking environments.<\/p>\n<\/div>\n<\/div>\n

<\/p>\n

Frequently Asked Questions<\/h2>\n
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What is the difference between a plastic double spur gear and two separate plastic spur gears?<\/p>\n

A plastic double spur gear combines two gear stages in a single moulded body on one hub shaft. Two separate spur gears require two individual bodies, two separate shaft pins, and two sets of shaft support bosses in the housing. The double gear reduces part count, eliminates one shaft, saves housing volume, and ensures perfect coaxiality between the two gear levels (since both are formed in the same mould). The trade-off is a slightly more complex mould \u2014 but this is easily offset by the reduced assembly cost and simpler housing design the double gear enables.<\/p>\n<\/div>\n

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Can both stages of a plastic double spur gear have different modules?<\/p>\n

Yes \u2014 the large gear and small gear of a double spur gear can have different modules (e.g., M0.7 large gear meshing with the motor, M0.5 small gear driving the output stage) when the design requires this for matching centre distances or optimising tooth strength at each stage. Korea Ever-Power designs double spur gear stages to customer specification \u2014 provide the required stage ratios, centre distances, and torque at each stage for a complete double gear design consultation.<\/p>\n<\/div>\n

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Are plastic double spur gears suitable for high-torque applications?<\/p>\n

Plastic double spur gears are suitable for light-to-moderate torque applications \u2014 robotics, toys, printers, cameras, medical devices, small machinery. They are not suitable for high-torque or high-speed applications where the lower strength and thermal conductivity of plastic compared with metal would cause rapid tooth wear or thermal failure. For high-torque applications at the same compact size, Korea Ever-Power recommends steel double spur gears or planetary gear stages. Contact Korea Ever-Power<\/a> with your torque and speed requirements for correct gear selection.<\/p>\n<\/div>\n<\/div>\n

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Customer Reviews<\/h2>\n
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“We build educational robot kits for schools and source ABS double spur gears (M1.5, DIN8) from Korea Ever-Power. The double gear eliminated one shaft pin from our robot joint assembly \u2014 reducing assembly time per joint from 4.2 to 2.8 minutes. Coaxiality between the two gear levels: measured < 0.03 mm runout across 100 pcs. Bidirectional torque test: same torque in both directions at 80% rated load \u2014 no measurable asymmetry. At our production volume of 25,000 robot kits\/year, the part count saving is significant.”<\/p>\n

Kim Da-eun<\/strong> \u00a0|\u00a0 Educational Robot Product Engineer, Incheon STEM Products Co. \u00a0\u00b7\u00a0 Q1 2026<\/em><\/p>\n<\/div>\n

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“We produce laser printers and use POM M0.7 double spur gears (24T+52T, Delrin 500P) from Korea Ever-Power \u2014 the same specification as the printer double gear example on Korea Ever-Power’s product page. Life test completed: 8 million feed cycles. Tooth thickness at 8M cycles: within 0.01 mm of initial measurement. Paper feed registration error at 8M cycles: unchanged from initial \u00b10.08 mm. Zero paper feed failures in our 18-month warranty period across 6,200 printers shipped.”<\/p>\n

Lee Jae-woo<\/strong> \u00a0|\u00a0 Printer Mechanism Design Engineer, Gyeonggi Digital Systems Co. \u00a0\u00b7\u00a0 Q4 2025<\/em><\/p>\n<\/div>\n<\/div>\n

<\/p>\n

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

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Plastic Gears<\/h3>\n

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

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

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

\n

Steel Spur Gears<\/h3>\n

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

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

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

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Helical Gears<\/h3>\n

Steel helical gears for low-noise drives.<\/p>\n

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

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\"\ubca0\ubca8<\/a><\/p>\n

\n

\ubca0\ubca8 \uae30\uc5b4<\/h3>\n

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

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

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

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Worm Gears<\/h3>\n

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

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

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

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Ring Gears<\/h3>\n

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

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

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

\n

Planetary Gears<\/h3>\n

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

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

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

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Other Gears<\/h3>\n

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

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

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

PA, POM, UHMWPE, ABS, PTFE, PPS, PEEK. M1\u2013M12. DIN6\u2013DIN9. Two tooth sets in one body \u2014 part count saving, space saving, bidirectional. Sample 20 days. Custom per drawing.<\/p>\n

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

Custom Plastic Double Spur Gear from Korea Ever-Power \u2014 Ever-Power 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":1753,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":""},"product_brand":[],"product_cat":[4565],"product_tag":[],"class_list":["post-1752","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\/ko\/wp-json\/wp\/v2\/product\/1752","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/gearrack.top\/ko\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/gearrack.top\/ko\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/gearrack.top\/ko\/wp-json\/wp\/v2\/comments?post=1752"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/gearrack.top\/ko\/wp-json\/wp\/v2\/media\/1753"}],"wp:attachment":[{"href":"https:\/\/gearrack.top\/ko\/wp-json\/wp\/v2\/media?parent=1752"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/gearrack.top\/ko\/wp-json\/wp\/v2\/product_brand?post=1752"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/gearrack.top\/ko\/wp-json\/wp\/v2\/product_cat?post=1752"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/gearrack.top\/ko\/wp-json\/wp\/v2\/product_tag?post=1752"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}