Helical Gears

A reliable source for Industrial Gear information and leading Industrial Gear Companies & Manufacturers.

This is possible because the rotation angle of the teeth can be adjusted by 90°. However, a parallel orientation is the most common. Helical gears are often called spiral gears when mounted on shafts at right angles. Read More…

Helical Gears Helical gears are circular in shape with teeth that have been cut in a helical path at an angle relative to the gear's axis of rotation. Helical gears can also be aligned parallel or crossed, allowing gears to transmit torque perpendicularly.

Leading Manufacturers

Joliet, IL  |  800-876-7216

Omni G & M Corporation is a leading gear fabricator specializing in precision machined and custom solutions in a variety of sizes and types. Please check out Omni G & M’s website or call a friendly personnel member today! Omni G & M’s commitment to customers is job #1 and customers across the United States depend on Omni’s experienced professionals for quality and reliability.

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Omni Gear & Machine Corporation $$$

East Walpole, MA  |  800-491-1073

Gears are what we do best, and we are experts in our field. We have three generations of experience backing our company, and we use all of it to benefit you in any way possible. We know exactly how to make gears efficiently and with durability. No matter what kind of gear you need, we can get it for you. Contact us today for additional details!

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Commercial Gear & Sprocket Company, Inc. $$$

Syracuse, NY  |  315-488-0100

Gear Motions is a leading gear manufacturer specializing in supplying custom cut and ground gears. Whether we’re manufacturing your gear complete or working from your blanks, our wide range of precision gear manufacturing capabilities and services deliver quality gears to meet almost any application. The Gear Motions network is capable of manufacturing all types of products including precision ground helical, spur, bevel and worm gears, sprockets, timing pulleys, shafts, splines and more.

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Gear Motions, Inc. $$$

Houston, TX  |  713-862-6200

Precision Pump and Gear Works specializes in gear repairs by either rebuilding the broken or chipped teeth, re-cutting them, or by rehobbing them. Part of our repair process is determining what happened so we can report it back to our customers; any misalignments, excessive temperatures, or overloading in the machine will be reported. We offer gearbox repair 24 hours a day, 7 days a week. Precision Pump will pick up and deliver gearboxes for free, all across the US. For more information about PPG call us today!

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Precision Pump & Gear Works $$$

South Bend, IN  |  574-234-4116

Schafer Gear Works is a leading producer of high-precision, custom-engineered industrial gears & machined parts. Look to us for the production of your spur, helical or internal gears. Since 1934, our values of hard work & commitment to customer satisfaction have been well ingrained into the culture of our company. Bring us your most demanding specifications and we’ll provide effective solutions.

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Schafer Gear Works, Inc. $$$

Hayward, CA  |  510-782-9226

Perry Tool & Research produces powder metal gears to AGMA standards of 8, 9, 10, 11 and 12 and processes to a Cpk 1.33 minimum. Bushings, bearings, grooved pulleys and an array of other mechanical parts are manufactured to the same high standards. We have 42 years of excellence producing powder metal parts.

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Perry Tool & Research, Inc. $$$
placeholder image Omni Gear & Machine Corporation Commercial Gear & Sprocket Company, Inc. Gear Motions, Inc. Precision Pump & Gear Works Schafer Gear Works, Inc. Perry Tool & Research, Inc.

Helical gears are used in applications similar to spur gears, which is the simplest type of gear, also called the "straight-cut gear." Spur gears are straight-sided along the gear wheel's axis, with straight teeth radiating in alignment with the axis. Offering a more refined design, the teeth in helical gears are cut so that they are not parallel to the axis of rotation, but instead are set angularly.The overlapping tooth contact of helical gears provides smoother, quieter functioning than spur gears, as well as making them better suited for high speed and large power transmission applications.

Helical Gear Manufacturing Manufactured Helical Gear - Omni Gear & Machine Corporation

There are also double helical gears, also referred to as herringbone gears, which offer two sets of teeth set in a v-shape. Examples of double helical and helical gear applications include presses, clay working machinery, sand mullers, rolling mills, feed drives, conveyors, cutters, blowers, compressors and manual transmissions.

Due to their wide-ranging applications, numerous industries utilize helical gears such as textile, marine, food processing, oil and gas, rubber, steel, mining, packaging, medical, defense and automotive.

A helical gear has two major circles: an outside circle and a pitch circle. The outside circle is determined by the distance around the outside edge of the helical gear's teeth. The pitch circle is unlike the outside circle; it can be found at the point where the teeth of two gears mesh. There are two key configurations of helical gear connections: parallel and non-parallel. In a parallel configuration, a pair of helical gears is used to connect parallel shafts. These gears must have the same pitch, pressure angle and helix angle, but must be opposite hand gears.

Opposite hand gears refers to right hand and left hand helical gear configurations. Helical gears must be one or the other and the configuration is easily identified through whether the teeth appear to be leaning to the right (right hand) or to the left (left hand). In a non-parallel configuration, a pair of helical gears is used to connect non-parallel shafts. The helical gears must have the same normal pitch and normal pressure angles, but can be the same or opposite hand configuration depending on the angle of the shaft.

Helical gears can be used in conjunction with worm gears, which have teeth arranged around a cylinder-shaped gear like a screw. In order to be actuated, the helical gear interlocks with the screw-like worm gear so that the axes are perpendicular. When interlocked by engaging the teeth of the helical gear and the worm gear, the contact starts at one end of the tooth and gradually spreads as the gears rotate. In this situation, the worm usually drives the gear, providing a high level of speed reduction. However, helical gears are most often used in conjunction with another helical gear.

Helical Gears Informational Video