Spur Gear Manufacturers in India

Spur Gears for Parallel-Shaft Drives

Asar Engineering is a spur gear manufacturer in India, with its manufacturing unit at Gandevi, Gujarat. We cut spur gears in-house, from small pinions to heavy-module gears, to the customer's drawing or sample. A spur gear is a cylindrical gear with straight teeth parallel to the axis of rotation. It transmits power between parallel shafts and changes speed and torque. The simple tooth geometry makes spur gears easy to make, install, inspect and maintain.

Unlike helical gears, spur gears have no tooth angle. Each tooth engages across its full face width at once. This gives efficient power transmission at moderate speeds, but also more impact, vibration and noise as speed increases.

We make each spur gear to suit the shaft arrangement, ratio, torque, speed, tooth size, material, heat treatment, lubrication and mounting of the machine.

A typical spur gear pair has a smaller pinion, which usually drives, and a larger wheel, which is driven. When the pinion drives the wheel, speed falls and torque rises. When a larger gear drives a smaller one, speed rises and torque falls.

When choosing a spur gear manufacturer in India, check the tooth-cutting capacity (module and diameter), material and hardening, inspection methods, and whether the supplier can match the gear to your machine or copy it from a worn sample. Spur gears are widely used in industrial machinery, material handling systems, mill drives and other low- to moderate-speed drives.

What is a Spur Gear?

A spur gear is a cylindrical gear with straight teeth cut parallel to its axis of rotation. It transmits rotation and power between parallel shafts.

It is one of the most basic gear designs because of its simple geometry. Helical gears, with their inclined teeth, produce axial thrust. Spur gears, with straight teeth, do not.

Spur gears are usually used in pairs. The smaller, driving gear is the pinion and the larger, driven gear is the wheel. The speed and torque ratio depends on the number of teeth on each gear.

For example, when a small pinion drives a larger wheel:

• Output rotational speed decreases.
• Output torque increases in proportion to the gear ratio, less small friction losses.
• The two external gears rotate in opposite directions.

Because two meshing external spur gears turn in opposite directions, an idler gear is added between them when both shafts must turn the same way.

The performance of a spur gear depends on these factors:

• Tooth Geometry: Tooth shape, dimensions and involute profile decide how the gears mesh and carry load.
• Module: The module is the pitch diameter divided by the number of teeth; it sets the tooth size.
• Pressure Angle: The pressure angle sets the direction of force between mating teeth. 20 degrees is standard.
• Number of Teeth: Tooth count, with the module, sets the gear diameter and the ratio.
• Gear Ratio: The ratio of teeth on the driven and driving gears sets the speed and torque relationship.
• Face Width: The width of the teeth sets the contact area and load capacity.
• Material: Selected according to load, wear, speed and environment.
• Heat Treatment: Hardening improves hardness, wear resistance and fatigue life where required.
• Manufacturing Accuracy: Tooth accuracy affects backlash, contact, noise, vibration and performance.
• Lubrication: Correct lubrication reduces friction and wear and extends the life of the gear pair.
• Operating Speed: Spur gears work best at low to moderate speeds, within the limits of their tooth accuracy and material.
• Transmitted Torque: Gear size and material must suit the required torque.

For industrial use, select the gear on actual load, speed, duty cycle, environment and service life, not on nominal gear dimensions alone.

Correct centre distance and backlash are important. Too little backlash causes heating and noise; too much causes knocking under reversing loads. Where the centre distance cannot be changed, a profile shift (addendum modification) can be used to fit the gears to it.

Applications of Spur Gears

Simple design, high efficiency and easy manufacture make spur gears a key part of many machines. They are most effective on parallel shafts at speeds where noise and vibration are not a problem.

Common applications include:

• Conveyor Systems: Industrial conveyors use spur gears in low- and moderate-speed drives between parallel shafts.
• Hoists and Cranes: Hoisting equipment uses spur gears to reduce speed and increase torque.
• Crushers and Mills: Crushers, ball mills and other heavy machinery use heavy-module spur gears and pinions in their drives.
• Cement, Sugar and Steel Plants: Mill drives, cane mill gearing, kiln auxiliaries and roller tables use large spur gears and pinions.
• Marine and Port Winches: Winches use spur gears to transmit power and provide torque for lifting and pulling.
• Material Handling Machinery: Lifting and handling equipment uses spur gears for simple speed reduction and torque increase.
• Packaging Machinery: Packaging equipment running at moderate speeds uses spur gears for controlled motion between parallel shafts.
• Machine Tools and Special Machines: Machine builders use spur gears for compact, simple speed and torque conversion.
• General Mechanical Equipment: Spur gears suit any drive with parallel shafts where the lower noise of helical gears is not needed.

The right application depends on speed, torque, gear size, lubrication, load, required service life and acceptable noise and vibration.

Common Types of Spur Gears

Spur gears come in different arrangements depending on where the teeth are cut and how the motion must be transmitted.

External Spur Gears

External spur gears are the most common type, with straight teeth cut on the outside of a cylindrical blank.

Two meshing external spur gears rotate in opposite directions. The ratio is set by their tooth counts.

Internal Spur Gears

Internal spur gears have teeth cut on the inside of a ring. A smaller external pinion runs inside the internal gear. Asar Engineering shapes internal gear teeth in-house.

Unlike two external gears, an internal gear and its pinion rotate in the same direction.

Internal gears give compact drives and are used as ring gears in planetary gear sets and in other special mechanisms.

Rack and Pinion

A rack and pinion consists of a round spur gear, the pinion, and a straight toothed bar, the rack. We cut racks in-house on CNC machines.

Instead of transmitting rotation between two shafts, it converts:

• Rotary motion into linear motion, or
• Linear motion into rotary motion.

This makes rack and pinion drives useful wherever controlled straight-line movement is needed, such as gates, sliding tables and lifting platforms.

Pinion and Wheel

A standard spur gear drive uses a smaller pinion driving a larger wheel. This reduces speed and increases output torque.

The reverse arrangement, where a larger gear drives a smaller one, increases speed and reduces output torque.

Idler Gear Arrangement

An idler gear sits between the driving and driven gears. It reverses the direction of rotation of the output but does not change the overall speed ratio.

It is used when input and output shafts must turn the same way, or to bridge a larger centre distance.

Core Components of a Spur Gear Drive

A spur gear drive consists of several elements that work together to transmit power between parallel shafts.

Gear Teeth

The straight teeth carry the load. Their profile, size, spacing and accuracy directly affect meshing and load transmission.

Gear Body

The gear body supports the teeth and connects them to the shaft through the bore, keyway or spline. It must be strong enough for the transmitted loads.

Pinion

The pinion is normally the smaller gear of the pair and usually the driver. It passes power to the larger wheel.

Wheel

The wheel is the larger, driven gear in a reduction drive. It takes the force from the pinion and delivers the required output speed and torque.

Shaft

The shaft supports the gear and transmits rotation to the connected machinery. It must be sized for torsional and bending stresses.

Bearings

Bearings support the shafts and keep the gears aligned. Because spur gears produce no axial thrust from the teeth, the bearing arrangement can be simpler than for helical gears.

Gear Housing

The housing encloses the gears and holds them in position. It protects the gears from contamination and holds the lubricant.

Lubrication System

Lubrication reduces friction and wear between mating teeth. It also carries away heat and protects the tooth surfaces.

Seals

Seals keep the lubricant inside enclosed gear drives and keep dust, moisture and other contaminants out.

Couplings

Couplings connect the gear drive to motors, shafts or driven equipment. Depending on the design, they can take up some shaft misalignment.

Mounting Arrangement

Correct mounting keeps the right centre distance and tooth alignment. Poor installation causes wear, noise, vibration and uneven tooth loading.

Before fitting, check that the shafts are parallel and the gears are aligned across the full face width. Misalignment concentrates the load on one end of the teeth and is a common cause of early pitting and tooth breakage.

Spur Gear Supplier in India

Asar Engineering is a spur gear supplier in India to industrial machinery builders, material handling, cement, sugar, steel and mining plants, and general engineering users. We supply new gears, replacement gears and heavy-module spur gears made to drawing.

A good supplier looks at actual operating conditions, not just nominal dimensions. Load, speed, torque, ratio, duty cycle, centre distance, material, lubrication and environment all affect the right spur gear design.

We check each requirement against the machine and its operating conditions before recommending material, hardening and tooth accuracy.

When evaluating a spur gear supplier, consider:

• Manufacturing and engineering capabilities
• Gear tooth machining accuracy
• Tooth profile consistency
• Material selection
• Heat-treatment practices
• Dimensional accuracy
• Gear ratio requirements
• Load and torque capacity
• Operating speed
• Center-distance requirements
• Lubrication arrangements
• Quality inspection procedures
• Customization capabilities
• Technical assistance
• Delivery coordination

Spur gears suit drives where efficiency, simple construction and no axial thrust matter. For high-speed machinery, check speed and noise limits before choosing them.

For large, slow-running drives such as mill and crusher gears, heavy-module spur gears are often preferred over helical gears. They are simpler to make and align, produce no axial thrust, and their teeth can be induction hardened for longer wear life.

If you need a replacement and have no drawing, send the worn gear or the pair. We measure the tooth count, module, pressure angle, face width and bore details from the sample, allow for wear, and make the new gear to match the mating gear.

Benefits of Spur Gears

• Simple Construction: Straight teeth on a cylindrical body make the design easy to understand, manufacture, inspect and maintain.
• High Efficiency: Spur gears transmit power very efficiently, typically around 98–99% per stage, because the tooth contact involves little sliding.
• No Axial Thrust: With teeth parallel to the axis, spur gears produce no axial tooth force.
• Simpler Bearing Arrangement: Without axial thrust, bearing selection and gearbox construction are simpler.
• Cost-Effective: Simple geometry makes spur gears economical to produce compared with helical or bevel gears.
• Reliable Power Transmission: Designed and run within their limits, spur gears give consistent power transmission.
• Exact Speed Ratio: The tooth counts of the gears give a fixed, predictable speed and torque ratio.
• Compact Drives: Spur gears suit compact drives between parallel shafts.
• Easy Maintenance: Simple construction makes inspection, lubrication and replacement straightforward.
• Versatile Arrangements: External gears, internal gears, rack and pinion and idler arrangements adapt spur gearing to different machines.
• Suited to Low and Moderate Speeds: Spur gears perform well where speeds stay within their design limits and noise is not critical.
• Torque Multiplication: A small pinion driving a larger wheel reduces speed and increases output torque.

Spur Gear Specifications

Actual limits, dimensions, material, tooth geometry, ratio, torque capacity, speed and tolerances must be confirmed for each spur gear design by calculation.

Spur Gear Exporter from India

Asar Engineering is a spur gear exporter from India and is registered with an IEC (Importer-Exporter Code).

We take export orders for spur gears, pinions, internal gears and racks for industrial machinery, conveyors, material handling equipment, marine winches and general engineering.

Export orders need attention to tooth size, material specifications, dimensional consistency, inspection, packaging, documentation and the customer's technical requirements.

Spur gears for export can be made to requirements such as:

• Gear diameter
• Number of teeth
• Module
• Pressure angle
• Face width
• Gear ratio
• Center distance
• Shaft diameter
• Input speed
• Output speed
• Transmitted torque
• Material
• Heat treatment
• Lubrication
• Mounting configuration

Complete information about the machine helps us decide whether an external gear, internal gear, rack and pinion or idler arrangement is right.

Why Choose Asar Engineering

• In-House Teeth Cutting: Spur gears, including heavy-module gears, internal gears and racks, are cut in-house at our unit in Gandevi, Gujarat.
• Made to Drawing or Sample: We manufacture to your drawing or from a worn sample, from one-off replacements to batch orders.
• Induction Hardening In-House: Teeth can be induction hardened in our own facility for wear resistance.
• Material Matched to the Application: Material and hardness are selected according to load, speed and operating environment.
• Inspection Before Dispatch: Dimensions and runout are checked with dial gauges before every gear is dispatched.
• Technical Support: You can discuss power, torque, speed, centre distance and ratio with our team before ordering.
• Supply Across India and Export: We supply customers across India and take export orders as an IEC-registered company.

This product is part of our industrial transmission gear range, made at our unit in Gujarat and supplied across India.

Related products: Gear Coupling, Industrial Gearbox, Spiral Bevel Gear.

Get Spur Gears Made to Your Drawing

Send us your drawing or sample, the quantity you need and details of your application, and we will quote. Asar Engineering supplies spur gears across India and takes export orders.