They have the characteristics of both straight and spiral bevel gears. Zerol bevel gears are spiral bevel gears with a nearly zero spiral angle and can be considered to be straight bevel gears with bent tooth forms. However, because the pinion shaft is offset from the large gear shaft, they are classified as non-intersecting shaft gears. They could be considered to be a type of spiral bevel gears. Hypoid gears are sometimes used in automotive rear wheel drives and have cone shapes. There are also special angular miter gears which have shaft angles other than 90 degrees. Miter gears also come in straight and spiral teeth. They are often used to change the direction of rotation without affecting speed. Miter GearsĪ pair of gears with the same number of gear teeth that transmits motion between the two right angle shafts are called miter gears. Spiral bevel gears are classified by the tooth cutting method and tooth form into Klingelnberg form (Germany) and Gleason form (US), but the Gleason form is now the mainstream.
Also, the twist of the tooth form produces thrust load which requires attention. They are suitable for high-speed heavy load operations but the production process is more difficult. Compared to straight bevel gears, they have larger contact surfaces with resulting smoother, less noisy rotation. This is bevel gear with a curved tooth form. Straight bevel gears are relatively easy to make and have simple shapes.
When the tooth is along the generating line of the cone (perpendicular line connecting the apex to the base circle), it is called a straight bevel gear. Kinds of bevel gears Straight Bevel Gears The general efficiency of bevel gears is about 98 to 99%. The angle of intersection may be any angle, but it is generally a right angle. Bevel gears belong to this type of intersecting shaft gears that are used to transmit rotational motion between them. Two shafts crossing each other at a point are called intersecting shafts. A cone-shaped gear having a cone as its pitch surface with gears cut along its surface is called a bevel gear.
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