Helical Gear will be our starter of blog series about gears; manufacturing, production, methods, materials, locations and usages of helical gears, as well as the Helical Gear Production in Turkey, and Gear Manufacturing Turkey in general are our subjects.

All About Helical Gears - What They Are and How They Work

Helical gear is a power transmission component that reduces speed while increasing torque across rotating shafts. They are divided into two groups: that  transmit power over parallel shafts or  transmit power across non-parallel shafts, also known as cross-axis gears. Although a helical gear does have the same involute tooth structure as a spur gear in section, this is cut at an angle to the gear blank’s rotation. The helix angle is the name for this angle. Helical gears are discussed in this article, along with their function and common uses.

Fundamentals of Helical Gear Operation

In technical terms, a spur gear is a helical gear with a 0° helix angle. Helix angles for helical gears are typically between 15 and 30 degrees. The 20° involute spur is the most common gear tooth shape. 14-1/2° involute spur gears were once widespread, but they are no more. These second-degree designations refer to the tooth’s pressure angle, or the line of contact that the two teeth follow as they enter and exit mesh. Only involute gears have a constant pressure angle all throughout meshing of the teeth. The involute tooth form’s genius is that it theoretically maintains steady speed ratios even when the middle distances are not exactly aligned.

Imagine a helical gear as a series of identical spur gears cut from sheet and glued together so that each subsequent layer advances slightly ahead of the one before it. The mating gear would have to stagger its levels in the opposite direction for such a system to work. As a result, right-handed and left-handed helical gears must be mated on parallel shafts.

Thrust loads are generated by handedness, which are not produced by mating spur gears. Ball or rollers capable of handling axial loading must be used in helical gear designs to deal with such a thrust loading.

Herringbone gears are a type of gear that can be used to eliminate thrust. The gear’s thrust is efficiently balanced by cutting half of the face with one hand and the other half in the opposite hand. A center gulley may be necessary for tool clearance, or the teeth may be staggered, based on the manufacturing procedure used to create such double-helical gears.

Cross-axis gears, which have perpendicular shafts, are an exception to handedness. Both gears are of the identical hand in these situations. Helical gear shafts can intersect at any angle.

Advantages of Helical Gear Manufacturing

When looking at the sheet model again, it’s simple how each spur gear level makes contact with its match before the next layer does, which is different from spur gears that make contact at the same time throughout the whole tooth face. Because each tooth’s diameter is greater, more teeth are in touch at any given time. Helical gears, on the other hand, transmit weights more efficiently than spur gears. And here in OGGO Tech we provide the production services for helical gears, aside from the specifics we provide gear production in Turkey facilities as well as spur gears, double helical gears production, herringbone gears production and many more. This results in increased load capacity, quieter operation, and faster speeds.

Applications of Helical Gear / Double Helical Gear

When a manual gearbox car is driven in reverse, the sound it emits demonstrates the silence of helical gears rather well. Its use of spur gears for opposite (so they may be “shifted” while the other gears remain in constant mesh) causes that characteristic whining. Forward speeds are handled by helical gears, which are noticeably quieter. Spur gears are used in certain 4-wheel drive drive shafts for the low range, when rates are slow and noise is not an issue.

Both spur and helical gear configurations are available in industrial gearboxes. The dispute about whether to use revolves with the specifics of an application. Helical gears sound right when noise is an issue, especially if the gear system will be working at high speeds. Especially, our gear production and gear manufacturing services provide your required specs. When space is limited or mass is a factor, spur gearing may be a superior option since it eliminates the need for thrust-carrying bearings. Spur gears are often less expensive to produce than helical gears, however the variation is only marginal. The cost of the more durable shaft supports/bearings required for helical gears is included in.

Parallel shafts are assumed in this discussion. For cross-axis shafts, the options are helical, bevel, and worm gearing, rather than spur and helical gears. OGGO Tech provides you all specs and needs for your gear manufacturing needs and gear production requests. OGGO Tech gear production Turkey facilities are perfect for gear manufacturing solutions. Helical gears are a less expensive way to transmit motion between crossing shafts, but their capability for transmitting big loads is limited when compared to parallel shafts. The gear pair that drives the vehicle engine distributor/oil-pump shaft is a popular use of crossed-axis helical gears.

Bevel gears have a far higher capacity than helical gears, but at a higher cost. Worm gears have high reduction ratios, however due to the high sliding friction they cause, they require heat control of lubricant.

When it comes to bevel gears, helical tooth shapes are frequently employed to create spiral bevel gears. Our related article on bevel gears has further information on these components.

Herringbone gears can occasionally be used as direct replacements for spur gears, although they are more expensive due to their more complicated construction. In very large transmission, such as shipboard primary reduction gears, herringbone gears are nearly always employed.

Gears are typically manufactured of grade 20 cast iron, while higher grades are available for improved strength at a higher cost. Steel is frequently utilized as a pinion material, meshing with a carbon steel gear to improve component wear balancing. Heat treatment can distort gears, thus it’s normally reserved for alloy steel gears. Grinding following a heat treatment might help to enhance the profile of your teeth. Gears are also made from bronze. Plastics are also utilized to produce gears, including the gear that pairs with a cast made of steel pinion in some cases.


Here we discussed the topics about Helical Gears. What is Helical Gear, where Helical Gears are used, how Helical Gears are manufactured, the manufacturing of Helical Gears in Turkey, their applications, pros and cons, fundamentals and more. Hopefully now it is more clear that we are into helical gears. Let’s discover in the future all we have to manufacture as gears in Turkey, and next subjects will include; Spur gears, herringbone gears, double helical gear production, PTO gear manufacturing, worm gears, cast gears, rubber gears, alloy steel gears and much more!

Design & Planning

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Delivery & Feedback

After the project is finished and delivered, our assessment team will rapport a total, top-down and bottom-up process, so that we know we are happy.