Core
Technology
Globoid Worm Gears
Globoid Worm Gear
/ Double Enveloping Worm Gear
Introducing Globoid Worm Gear
- Advantages of High Reduction Ratio and Simple Structure: Double-enveloping worm gears, known as globoid worm gears, offer a simple yet efficient solution to common issues such as heat generation and premature damage. Their high reduction ratio is a key advantage.
- Unique Enveloping Design: As the name suggests, these gears have a distinctive structure that envelops and conforms to the curves of both the wheel and the shaft, providing a precise and secure fit.
- Superior Performance and Stability: Among worm gears developed to date, globoid worm gears exhibit the highest performance-to-efficiency ratio and possess a stable structural design.
Cylindrical
Worm Gear
Globoid
Worm Gear
High Ratio and Simple Structure: Cylindrical worm gears offer a high gear ratio and a straightforward, easy-to-produce structure.
Low Contact Points: However, they have fewer engagement points between gear teeth, which can lead to increased heat generation and a higher risk of premature breakage and damage.
Simultaneous Teeth Area Contact: Their structure involves more engagement and continuous sliding contact, resulting in efficient transmission and reduced heat generation.
Globoid Worm Gears
Cylindrical Worm Gear VS Globoid Worm Gear
Precise tooth design, demanding machining, simultaneous surface contact geometry
Double Enveloping Structure
- Compared to cylindrical worm gears, the surface contact of globoid worm gears is very difficult to manufacture because the unit area must be calculated and designed differently to ensure precise engagement with the tooth surfaces. However, we have developed a perfect simultaneous contact globoid worm gear through 20 years of design know-how and 3D analysis.
Cylindrical Worm Gear Contact Area (Point)
Globoid Worm Gear Contact Area (Surface)
EasternGear’s
Globoid Worm Gear
- Globoid Worm Gear is an improved simultaneous area contact gear than the worm gear specified in AGMA 6135 A-02, and has a structure that facilitates load distribution due to its wide contact surface.
ANSI/AGMA
6135-A02
EasternGear
Globoid Worm Gear
3D Design
Globoid Worm Gear
(Double Enveloping Worm Gear)
Globoid Worm Gear Gearset Central Plane
Globoid Worm Gear Contact Image
Globoid Worm Gear
Contact Pattern
Simultaneous Area Contact Gear
- Regular cylindrical worm gears have point or line contacts, whereas globoid worm gears have simultaneous area contact. This means multiple gear teeth are engaged and mesh at the same time for maximized force transmission.
- When the gear shaft drive rotates, the contact area gradually expands, resulting in stable and consistent power transmission and increased efficiency and longevity of the product.
Gear Contact Pattern
After 8 Hours of Running-in
Globoid Worm Gear
Contact Pattern
Simultaneous Area Contact Gear
Comparison of Gear Contact Pattern
Before Running-in
Comparison of Gear Contact Pattern
After Running-in
Technological Status of Globoid Worm Gears
- Despite patent disclosure, only a few gear manufacturers have achieved successful implementation of globoid worm gears.
In the early 2000s, the American National Standards Institute (ANSI) established the only international standard for globoid worm gears through the American Gear Manufacturer Association (AGMA).
Globoid Worm Gears
US Patent
(1925, S.I. Cone)
Globoid Worm Gears
International Standard
ANSI/AGMA
6135-A02
- Designing these gears requires a complex algorithm based on geometrical theory to create a double-enveloping structure. Each tooth surface's unit area must be calculated and processed differently to ensure proper meshing from wheel to shaft.
From Start to Finish. EasternGear possesses the technological knowledge that is implemented in all stages of production.
We have developed algorithms accounting for geometry and topology from product design, modulation, manufacturing, and performance testing.
Simulating our gear reducers and gear contact structure virtually with digital simulation programs
EasternGear’s
5-Axis CNC Machine
- By combining traditional gear processing technology with advanced current technology, we produce high-quality products at a more competitive price than existing production methods.
- We have manufacturing technology that can lower manufacturing costs and maximize productivity based on design data accumulated over 10 years.
Data-based
optimal ToolPath
Process optimization
using 3D simulation
Precision manufacturing
using simultaneous 5-Axis CNC Machine
EasternGear’s Process
Analysis and
Design
Gear Fit
Test
Final Performance
Test
In-house Processing
of Key Parts
Product
Assembly
