Straight, Spiral, & Zerol Bevel Gears

Bevel gears are conically shaped gears produced as both straight and spiral bevel gears. The gears are commonly mounted on shafts that are perpendicular to each other. They are used to transfer mechanical energy between intersecting shafts. The shaft angle can be any angle, but bevel gears are typically used to transfer power at 90°, and the teeth are milled to interlock. SDP/SI produces bevel gears using the Gleason® / Coniflex® (cutting) manufacturing methods.

Bevel gears are used in many industries, including aviation, robotics, defense, automobiles, and the railroad industries, and can be found in industrial mixers, cooling towers, printing presses, hand drills, garage doors, and forklifts, to name a few.

To satisfy need and help move projects forward more quickly, SDP/SI offers stock inch and metric bevel gears in steel, stainless steel, aluminum, brass, nylon, and acetal; 72 pitch to 16 pitch and modules 0.5 through 8; ratios of 1:1 to 5:1 with higher ratios available upon request. 

Precision Fairloc® Bevel Gears

Our bevel gears are manufactured with pin-type hubs, clamp-type hubs, and the exclusive Fairloc® hub design. Certified lab-tested and proven for its effectiveness, our Fairloc® hub solves problems with shaft marring, wobble, and misalignment and has immeasurable adjustability  (Fairloc® - The Integral Fastener).

A round serrated top with a hole in the center, and a round smooth chrome silver bottom

We offer four types of bevel gears

A serrated gear shaped in a spiral, with a right angle line pointing straight down and 90 degrees right from the center of the page

Straight Tooth Bevel Gear

These are the most popular and simplest to produce in the family of bevel gears. The teeth have tapered conical elements that have the same direction as the pitch cone base line. Straight tooth bevel gears allow for greater tolerances; vibration and noise are also factors, limiting straight tooth bevel gears to applications running at lower speeds and where noise is not a factor.

A grooved circle with a grooved mushroom shaped gear on top, the grooves matching. A line going from the center of the image straight up with a second line 30 degrees to the right

Spiral Bevel Gears

These bevel gears have spiral teeth cut at a helical angle (12°–20°). They are much more complex to manufacture, but they offer higher strength, higher speeds, and higher torque. They run quieter than straight-tooth bevel gears because the teeth of spiral bevel gears are oblique, producing greater tooth contact. The result is smoother travel with minimal vibration and lower noise. Spiral bevel gear sets are made either right-hand or left-hand and are not interchangeable unless built to be so purposefully. We can supply spiral bevel gears in a large variety of modules, materials, and bores.

A grooved circle with a grooved mushroom shaped gear on top, the grooves matching. A line going from the center of the image straight up with a second line 40 degrees to the right

Zerol Bevel Gears

Zerol bevel gears are a special type of spiral bevel gear that combines the benefits of both straight and spiral bevel gears. They are spiral bevel gears with a zero-degree spiral angle at the center of the face width. They produce no inward thrust force (like straight-tooth bevel gears), allowing them to be a replacement for straight-tooth bevel gear applications. Unlike straight bevel gears, Zerol bevel gears can have a ground finish, which allows for higher precision, quieter operation, and greater anti-friction properties. Typically, spiral bevel gears can only be rotated in one direction, but because Zerol gears have a zero twist angle, they can rotate in either direction like straight bevel gears.

A grooved circle with a grooved mushroom shaped gear on top, the grooves matching. A line going from the center of the image straight up with a second line 50 degrees to the right

Hypoid Bevel Gears

Developed by the Gleason Corporation in 1925, a hypoid bevel gear has shaft axes that are neither intersecting nor parallel. Hypoid gears were specifically developed for use in the automobile industry, allowing the drive to the rear axle to be nonintersecting and thus permitting the auto body to be lowered. The production and shaping of hypoid gears are comparable to those of spiral bevel gears, but the spiral angle of a hypoid bevel gear can be made bigger in the smaller pinion gear than in the spiral diameter of the larger gear of the pair due to the distance between the two gear axes (offset). The hypoid gear can transmit greater torque and work at higher gear ratios due to a higher contact ratio. This is possible because the ratio of the number of teeth is not proportionate to the ratio of their pitch diameter.

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