Spur Gear
Custom Spur Gears for Reliable Power Transmission
Engineered for efficiency and durability, our spur gears are the cornerstone of high-performance machinery. We manufacture to your exact specifications.
- High-Efficiency Performance (98-99%)
- Robust, Cost-Effective Design
- Manufactured from Certified Materials
- Precision Ground for Smooth Operation
Manufacturing Capabilities
We custom-manufacture spur gears based on your drawings and technical requirements. While ideal for parallel shafts, applications needing lower noise at high speeds may require our helical gears.
| Module | 0.5 to 16 Module |
| Diametral Pitch (DP) | 48 DP to 1.5 DP |
| Maximum Diameter | Up to 1500mm (59 inches) |
| Materials | Alloy Steel (EN Series), Carbon Steel, SS, Cast Iron, Bronze, Nylon |
| Heat Treatment | Carburizing, Nitriding, Induction Hardening, Through Hardening |
| Gear Quality Standard | Precision ground up to DIN 6 / AGMA 12 standards |
Common Industrial Applications
Our precision spur gears are trusted in a wide range of demanding sectors:
- Industrial Gearboxes
- Conveyor Systems
- Automotive Transmissions
- Machine Tools (Lathes, Mills)
- Pumping Equipment
- Robotics & Automation
- Printing Machinery
- Power Tools
Understanding Key Gear Parameters
A quick reference for the essential terms used in gear design. For gears to mesh correctly, their Pitch and Pressure Angle must match. These principles also apply to linear motion systems like a rack and pinion.
| Term | Definition & Use | Formula |
|---|---|---|
| Pitch Diameter | The functional diameter of the gear where meshing occurs. | Teeth / Diametral Pitch |
| Diametral Pitch (DP) | (Imperial) The number of teeth per inch of pitch diameter. | Teeth / Pitch Diameter |
| Module (m) | (Metric) The size of the tooth, ratio of pitch diameter to teeth. | Pitch Dia (mm) / Teeth |
| Pressure Angle | The angle of contact between meshing gear teeth (e.g. 20°). | Standard Value |
| Addendum | Height from pitch circle to the top of the tooth. | 1 / Diametral Pitch |
| Dedendum | Depth from the pitch circle to the root of the tooth. | 1.25 / Diametral Pitch |
| Outside Diameter | The gear's largest diameter, used for clearance checks. | (Teeth + 2) / DP |
| Center Distance | The distance between the centers of two mating gears. | (Pitch Dia A + Pitch Dia B) / 2 |
| Gear Ratio | The ratio of rotational speeds between two gears. | Teeth (Driven) / Teeth (Driver) |
Detailed Terminology Explained
Module (Metric) & Diametral Pitch (DP) (Imperial): These two terms define the size of the gear teeth. In the metric system, Module is used; as the module value increases, the tooth size increases. In the Imperial system, Diametral Pitch (DP) is used; it represents the number of teeth on a gear with a one-inch pitch diameter. A higher DP value means smaller teeth. Mating gears must have the same Module or DP.
Pressure Angle: This is the angle between the line of force acting between meshing teeth and the tangent to their pitch circles. It directly affects the load-carrying capacity and efficiency. The most common standard for both metric and imperial gears is 20°, though 14.5° is also seen in older imperial systems.
Addendum & Dedendum: The Addendum is the radial height of the tooth from the pitch circle to its tip. The Dedendum is the radial depth from the pitch circle to the tooth root. The sum of these two values determines the total tooth height and influences the clearances between gears.
Backlash: An essential parameter not shown in the table, backlash is the small gap between mating gear teeth when they engage. A minimum amount of backlash is necessary to prevent the gears from binding, to allow for thermal expansion, and to ensure lubricant can penetrate the contact zone. We control backlash to precise tolerances based on your application's requirements for precision.
Frequently Asked Questions
The primary advantage is high efficiency and a cost-effective design for parallel shafts. It's robust and produces no axial thrust. For angled shafts, a bevel gear would be required.
It depends on load, speed, and environment. Alloy steels excel in high-load scenarios, while Nylon is for low-noise systems. For high gear ratios, a worm gear drive is often an excellent choice.
We provide comprehensive quality assurance documentation, including Material Test Certificates and Dimensional Inspection Reports. You can read more about our commitment to quality here.
Technical Drawing Example
We manufacture gears from detailed engineering drawings to ensure perfect fit and function.
The Shreeji Gears Advantage
We build more than gears; we engineer reliability for your specific application.
Material & Heat Treatment Mastery
A spur gear's strength lies in its material. We select the optimal alloy (like EN24 for high torque or EN36 for case hardening) and apply precise heat treatments like carburizing or induction hardening to create a gear with a tough core and a wear-resistant surface, ensuring maximum operational life.
Precision for Peak Efficiency
Spur gears are inherently efficient, but only with perfect geometry. Our CNC gear grinding achieves exceptional accuracy (up to AGMA 12), minimizing backlash and operational noise. This precision ensures you get the full 98-99% power transmission efficiency that spur gears are known for.
Your Blueprint-to-Component Partner
We excel at turning your exact technical drawings into functional components. Whether it's a unique bore, a specific keyway, or a non-standard face width, we manufacture to your print, guaranteeing a perfect drop-in fit for your assembly, eliminating integration hassles.
A Deeper Dive into Spur Gear Fundamentals
Understanding the core principles of spur gear design is key to specifying the right component for your machinery.
What is a Spur Gear?
A spur gear is the most common type of cylindrical gear. Its defining feature is its straight teeth, which are cut parallel to the axis of rotation. Because of their simple design and high efficiency, they are a fundamental component in countless mechanical drive systems for transmitting power and motion between parallel shafts.
By carefully selecting the size and number of teeth, a spur gear pair can increase torque while decreasing speed, or vice-versa. For two gears to mesh correctly, they must share the same Pitch and Pressure Angle. The driven gear always rotates in the opposite direction of the driving gear.
Manufacturing & Materials
We produce spur gears using advanced gear hobbing and shaping machines. The material choice is critical and depends entirely on the application's demands for strength, durability, and noise level. Common materials include:
- High-Strength Steels: Alloy and carbon steels for industrial power transmission.
- Bronze & Brass: For applications requiring corrosion resistance.
- Plastics & Nylon: For low-load, low-noise environments.
These materials can then be heat-treated (hardened) to meet precise requirements for toughness and wear resistance.
The Involute Tooth Form
Most industrial spur gears, including ours, feature an involute tooth profile. This specific curve is the key to smooth, rolling contact between meshing teeth. It allows for variations in the center distance without affecting the gear ratio and is relatively easy to manufacture with high precision, ensuring consistent and efficient power transmission.
Advanced Concept: Profile Shift
While most applications use standard gears, sometimes it's necessary to modify the gear's tooth profile. This is done using a "profile shift coefficient." Applying a positive shift can help avoid undercutting on gears with a low number of teeth or can be used to slightly adjust the center distance between a gear pair. While not typically required, our engineering team can utilize profile shifting to solve unique design challenges or strengthen a specific gear design. When no shift is applied (a coefficient of 0), the gear is considered a standard spur gear.
"The precision and durability of the spur gears from Shreeji Gears have significantly improved the reliability of our conveyor systems. Their team's technical support was outstanding. Highly recommended."— Lead Engineer, Major Automation Firm
Get a Fast, Accurate Quote
Provide us with your technical specifications for a competitive, no-obligation quote.
For the fastest service, please email your technical drawing to support@shreejigears.com. Alternatively, include these key parameters in your inquiry:
- Module or Diametral Pitch (DP)
- OD Outer Diameter
- Number of Teeth & Face Width
- Material & Required Hardness
- Bore Size & Keyway Details
- Required Quantity