기어 휠과 기어 랙

Gear wheel and gear rack form one of the most fundamental rotary-to-linear motion conversion mechanisms in mechanical engineering. A gear wheel — a toothed rotating component — meshes with a gear rack — a linear toothed bar — to convert the rotary motion of a shaft into precise linear displacement, or to convert linear force into rotary torque. Together they are the backbone of CNC machine tool table drives, rack-and-pinion steering systems, automated gate and door drives, elevator and hoist mechanisms, and any application where controlled linear motion must be achieved from a rotary power source. Korea Ever-Power supplies a full range of gear wheel and gear rack combinations in steel, stainless steel, cast iron, aluminium, and plastic — in standard metric and inch sizes, and custom per drawing.

Korea Ever-Power is a specialist manufacturer of all kinds of mechanical transmission and hydraulic transmission products: planetary gearboxes, worm reducers, in-line helical gear speed reducers, parallel shaft helical gear reducers, helical bevel reducers, helical worm gear reducers, agricultural gearboxes, tractor gearboxes, auto gearboxes, PTO drive shafts, gear racks, chains, timing pulleys, and related gear components — as well as customised gear wheels, gear racks, and gear sets per customer drawings.

Gear Wheel Specifications

Gear Rack Specifications

Linear Displacement per Revolution

For a spur gear wheel meshing with a spur gear rack, the linear displacement of the rack per full revolution of the gear wheel equals the gear wheel's pitch circumference: L = π × m × Z, where m is the module and Z is the number of teeth. For example, a 20-tooth M2 spur gear produces a rack displacement of π × 2 × 20 = 125.7 mm per revolution of the gear. This simple, exact relationship is why the rack-and-pinion mechanism is preferred for applications requiring precise linear positioning with a known and repeatable relationship between motor turns and linear travel.

Module Matching Requirement

The gear wheel and gear rack must have identical modules (or identical DP in inch systems) and identical pressure angles (standard 20°) to mesh correctly. A mismatch in module or pressure angle causes incorrect tooth contact — the teeth either bind (too tight) or rattle (too loose), both leading to rapid wear. Korea Ever-Power supplies matched gear wheel and gear rack sets confirmed to the same module and pressure angle, and advises on the correct combination for each application.

Spur vs Helical Rack

Spur gear racks have teeth perpendicular to the rack axis. Helical gear racks have teeth at a helix angle — typically 15° or 19.5° for standard helical rack sets. Helical racks produce smoother, quieter operation because multiple teeth engage simultaneously (gradual load transfer) and the axial thrust from the helix angle damps vibration. The tradeoff is that a helical pinion (gear wheel) with the correct matching helix angle is required. Korea Ever-Power supplies both types, and ground helical gear racks for the highest-precision CNC applications.

Hardened Ground Rack for CNC

For CNC machine tool table drives and precision linear motion applications, hardened and ground gear racks are specified. The carburised or case-hardened rack surface (HRC 58–62) resists pitting fatigue over millions of engagement cycles; the ground tooth profile and pitch accuracy (typically DIN 5–6 for ground racks) produce the transmission accuracy needed for sub-0.1 mm positioning repeatability. Korea Ever-Power supplies hardened ground racks and matching precision ground pinions as sets for CNC applications.

Rack Joining for Long Travel

Standard gear racks are supplied in lengths of 1,000 mm (1 metre). For longer travel distances, multiple rack sections are joined end-to-end. The joint must maintain pitch continuity — the tooth pitch across the joint must equal the rack's standard pitch with no step error. Korea Ever-Power's steel gear racks with mounting bolt holes are designed to facilitate rack joining: the bolt hole pattern allows correct registration of adjacent rack sections at the joint, maintaining pitch continuity without special tooling.

Round Gear Rack (Circular Rack)

A round (circular cross-section) gear rack is a cylindrical bar with teeth cut along its length — in contrast to the rectangular cross-section of standard racks. Round racks are used in cam mechanisms, push-pull linkages, and applications where the rack must fit within a cylindrical bore. Korea Ever-Power supplies steel round gear racks and stainless steel round gear racks in standard metric modules, and can supply with or without keyway for rotation-prevented installation.

Gear Racks

Spur gear racks (metric and inch), steel helical gear racks, ground helical gear racks, hardened ground racks, steel round gear racks, stainless steel round gear racks, stainless steel gear racks, racks for door openers, gear racks for lift/elevator/hoist, plastic gear racks, moulded flexible gear racks, steel gear racks with mounting bolt holes.

Spur Gears

DP steel spur gears, module steel spur gears, steel hubless spur gears, steel ring gears (spur type), stainless steel spur gears, brass spur gears, powder metal sintered metal spur gears, plastic spur gears, plastic spur gears with steel core, plastic spur gears with sintered metal bushings, anti-backlash spur gears.

Helical and Herringbone Gears

Steel helical gears, ground helical gears, herringbone gears. Herringbone gears eliminate the axial thrust of single-helix helical gears by combining left-hand and right-hand helix teeth in one gear — the axial forces from each half cancel out, producing zero net axial load on the shaft and bearings.

베벨 기어

Steel bevel gears and pinion shafts, spiral bevel gears, ground spiral bevel gears, ground Zerol bevel gears, finished bore spiral bevel gears, stainless steel bevel gears, plastic bevel gears, injection-moulded bevel gears (Duracon), forged bevel gears, steel miter gears.

Worm Gears

Gray iron worm gear wheels, bronze worm gear wheels, nylon plastic worm gear wheels, duplex worm gear wheels, duplex worms, worm wheels for worm drive — covering the full range of worm gear types for industrial, automotive, and precision applications.

Screw and Special Gears

Plastic screw gears, aluminium-bronze screw gears, stainless steel screw gears, steel screw gears, stem pinions, change gears, hypoid gears, ratchet wheels, ring gears, gear couplings (inner hub and ring), herringbone gears.

Materials Available

Low carbon steel, C45 medium carbon steel, 20CrMnTi (carburising alloy), 42CrMo (high-strength alloy), 40Cr (alloy steel), stainless steel — adaptable to customer requirements. For gear racks in corrosive environments, stainless steel gear racks are specified. For plastic gear wheels, POM (Delrin), nylon (PA66), and sintered metal options are available. Brass and bronze for worm wheels.

Surface Treatment

Blacking (black oxide — oil-retained, corrosion-retardant), galvanisation (zinc-plated — indoor corrosion protection), chroming (hard chrome for wear resistance), electrophoresis (cathodic electrocoat — automotive quality corrosion protection), colour painting (RAL colour to specification). Surface treatment selection is guided by the operating environment and customer specification.

Heat Treatment

High-frequency quench hardening (induction hardening of tooth surface only — core stays tough); carburising (20CrMnTi — deep case, HRC 58–62 surface, tough core); nitriding (surface hardness to HV900+ without distortion — ideal for rack surfaces where grinding after hardening is not practical); carbonitriding (shallower than carburising, combined C and N diffusion for wear and corrosion resistance).

CNC Machine Tools

Hardened ground gear racks with matched precision helical pinions in CNC machining centre X/Y table drives, CNC router gantry drives, and CNC plasma cutter table drives. The ground rack tooth surface (Ra 0.4–0.8 µm) and DIN 5–6 accuracy produce the positioning repeatability required for CNC table drives: typically ±0.02–0.05 mm over the full rack length.

Automotive and Agricultural

Gear wheels and racks in automotive rack-and-pinion steering gear assemblies, tractor gearbox components, and agricultural machinery feed drives. Korea Ever-Power's agricultural gearbox and tractor gearbox programmes cover the full range of agricultural gear components including spur gears, bevel gears, and gear racks for these OEM customers.

Automated Doors and Gates

Gear racks for automatic sliding door openers and automated security gate drives — the rack mounts on the door or gate leaf; a drive pinion mounted on the motor unit engages the rack to open and close. Korea Ever-Power's door opener gear racks are available in standard lengths with pre-drilled mounting holes for easy installation on door frames and gate leaves.

Elevators, Hoists, and Construction

Heavy-duty gear racks for construction hoist (man and materials hoist) vertical drives, rack-and-pinion elevators, and mast climbing work platforms. These applications require large module racks (M6–M12) in heat-treated alloy steel — Korea Ever-Power supplies to the safety standards required for lifting applications, with full material certification.

Marine and Offshore

Stainless steel gear racks and gear wheels for marine environment valve actuators, offshore platform positioning systems, and ship deck machinery. SS316 stainless steel provides the chloride corrosion resistance required for marine and offshore rack-and-pinion drives operating in salt air and seawater spray environments.

General Industry

Standard C45 steel spur gear racks with matching pinion gears in general industrial linear motion systems: material handling conveyors, robotic arm linear axes, solar tracker azimuth drives, winding machine traverse drives, and any application converting rotary motor output to controlled linear motion.

Are you a trading company or a manufacturer?

Korea Ever-Power Group consists of 3 factories and 2 abroad sales corporations — a manufacturer and exporter, not a pure trading company. With over twelve years of history, 1,000 workers, and ISO certification, Korea Ever-Power has the manufacturing scale and technical team to supply all standard and custom gear wheel and gear rack types with quality assurance and consistent delivery.

What is the delivery time and payment term for gear wheel and gear rack orders?

Standard delivery is 40–45 days; the time may vary depending on the product and customisation level. Payment terms: 30% T/T in advance, balance before shipment. For standard products with no customisation, shorter lead times may be available — confirm at the quotation stage. Samples are available free of charge (customer pays freight).

What is the MOQ for gear wheels and gear racks?

As an OEM company, Korea Ever-Power can adapt products to a wide range of needs — MOQ and price vary significantly with size, material, and specifications. Costly products or standard products typically have lower MOQ. Please contact Korea Ever-Power with all relevant details to get the most accurate quotation. Small trial orders are accepted.

Can Korea Ever-Power produce customised gear wheels and racks not on the standard list?

Yes — Korea Ever-Power produces customised gear wheels and gear racks per customer drawings, including non-standard modules, special materials, special lengths, and special cross-sections. The engineering team can also customise variators, geared motors, electric motors, and other hydraulic products according to customer drawings. Contact Korea Ever-Power with your specification to begin.

"We manufacture CNC router tables for woodworking and source hardened ground gear racks with matched helical pinions from Korea Ever-Power. Rack pitch accuracy at incoming: pitch error 4 µm per 300 mm section — within DIN 6 tolerance. Gantry positioning repeatability on our table: ±0.03 mm over 4 metres — within our ±0.05 mm specification. Three years' supply, 18 sets installed and running."

Kim Hyun-woo  |  CNC Router Table Production Engineer, Incheon Woodworking Equipment Co.  ·  Q1 2026

"We build automated sliding gate systems and purchase M6 steel gear racks with mounting bolt holes from Korea Ever-Power. Delivery on schedule at 42 days. Material certification (C45 steel, chemical analysis) supplied with each batch. Rack surface blacked — no corrosion after 18 months outdoor installation in coastal environment with regular hosing down. Pitch continuity at rack joints confirmed with our calibrated rack micrometer."

Lee Sang-jun  |  Automated Gate Systems Engineer, Gyeonggi Security Automation Co.  ·  Q4 2025

"We are an agricultural machinery OEM and source spur gear wheels and racks for our tractor-mounted equipment drives from Korea Ever-Power. The 30% T/T advance payment arrangement works well for us. Free sample shipped before first bulk order — confirmed dimensions and heat treatment hardness (HRC 55 measured). Korea Ever-Power's OEM programme handles our annual 2,000-piece order volume with consistent quality across batches."

Park Dong-jun  |  Agricultural Machinery Production Manager, Daejeon Agri-Equipment Co.  ·  Q2 2026