What Are the Common Types of Powder Metallurgy Gears? Shared Today by Guangming Group

Common Classifications & Types of Powder Metallurgy Gears

Below is a complete classification sorted by structural style, application, forming process, tooth profile and composite structure, covering the most widely‑used types in the industry:

I. Classification by Basic Tooth Profile

Spur Gears (Largest Consumption Volume)

The most mainstream type with the simplest compressing and processing. Spur powder metallurgy gears are widely adopted for reduction motors, power tools and household appliance motors.

Internal Gear Ring (Planetary Gear Ring)

Core component of planetary reducers, often manufactured in sets matched with planetary pinion gears.

Duplex / Multi‑Step Gears

Integrally formed with two sets of large and small teeth. Steps and spacing features are pressed in one operation, eliminating the assembly of two separate gears.

Bevel Gears

Applied for 90‑degree direction‑changing transmission. Small‑to‑medium modulus straight bevel gears are suitable for powder metallurgy forming.

Spline Gears & Internal‑Spline Gears

Internal bores are integrally formed with splines for fitting onto motor shafts and transmission shafts.

Eccentric Gears

Specially designed for reduction mechanisms and reciprocating structures, featuring off‑center gear blanks.

II. Composite Integrated Special‑Shaped Gears (Core Advantage of Powder Metallurgy)

Integrated Gear‑Boss‑Bushing Gears

Outer ring teeth, intermediate steps and inner mounting bores are integrally formed in a single process.

Combined Gear‑Sprocket Components

Composite transmission parts with gear teeth on one side and sprocket teeth on the other.

Custom Gears with Counterbores, Positioning Slots & Notches

Recesses, locating stops and limiting notches are directly formed by dies with no subsequent machining required.

Ratchet Gears & One‑Way Pawl Gears

One‑way transmission components used in door locks and retractors.

III. Classification by Application & Structure

Planetary Pinion Gears

Small planetary gears mounted on reducer planet carriers, standard parts for automotive and servo gearboxes.

Sun Gears

Central driving gears in planetary gear sets.

Idler Gears

Function only for direction transition without transmitting high power.

Micro Fine‑Module Gears

Module ranging from 0.2 to 1.5, used in robot vacuum cleaners, camera motors and precision instruments. Many fine‑tooth variants adopt MIM (Metal Injection Molding) technology.

IV. Two Major Process‑Based Categories

Conventional Compaction‑Formed Gears

Suitable for spur teeth and simple step structures for mass‑volume production under moderate loads; iron‑based grades are the most common.

MIM (Metal Injection Molding) Gears

Ideal for ultra‑fine modules, complex geometries and thin‑wall special shapes. They deliver higher density and superior mechanical strength, widely used in precision small home appliances, medical devices and micro reduction motors.

V. Common Gears by Material

Iron‑Copper‑Carbon Gears: Household appliances, door locks, fan motors and general reduction gears

Alloy Steel (Nickel‑Molybdenum) Gears: Power drills, automotive motor gears and heavy‑load planetary gears

Bronze Copper‑Based Gears: Low‑noise low‑speed gears and instrument transmission parts

Stainless Steel Gears: Water‑resistant drive gears for food‑processing equipment and sanitary‑ware systems

Keywords: powder metallurgy, metal injection molding, powder metallurgy gears

Guangming Group focuses on R&D and manufacturing of metal forming technologies and wear‑resistant materials. Its main products cover powder‑metallurgy components produced via powder compaction and metal injection molding.

The company employs a high‑caliber talent team. Its founding team comes from Guangzhou Research Institute of Non‑Ferrous Metals, a national ministerial‑level research institute. Boasting rich industrial experience and strong R&D capabilities, the team delivers continuous innovation driving corporate growth.

The company has obtained 5 invention patents and over 30 utility‑model patents. It has been certified to IATF16949 Quality Management System, ISO9001‑2015 Quality Management System, ISO14001 Environmental Management System and Intellectual Property Management System, together with international trademark registration.

It is recognized as an Innovative Enterprise of Guangdong Province, a Guangzhou Sci‑Tech Little Giant Enterprise, council member unit of Guangdong Powder Metallurgy Industry Technology Innovation Alliance and initiator of Guangzhou Advanced Powder Metallurgy Cluster Promotion Center.