Hypoid Gears

Hypoid gears have specially formed teeth on a circular face that are driven by a worm-like drive on non-intersecting axes.  They are similar to bevel gears, but driven by a worm-like drive on non-intersecting axes.  Hypoid gears can be anti-backlash, which mean that they have an assist, typically one or more springs, which eliminate backlash in the gear mesh.

Important gear specifications to consider when searching for gears include number of teeth, pitch diameter, face width, and bore diameter.  The number of teeth along with the desired pitch diameter will dictate pitch of gear.  The pitch diameter is diameter of tooth drive action.  The face width is width of the teeth.  The bore diameter refers to the diameter of center bore for gears with a bore.  The tooth form can be straight or spiral.  In a straight teeth configuration the tooth axis is parallel to axis of rotation. Pressure angle is the angle between the line of force or action and the tangent to the pitch circle at the point of mesh. The most common pressure angles for gears are 14.5° and 20°, while some worms and worm gears utilize a 25° pressure angle. Hypoid gears must have the same pressure angle to mesh.

Other important specifications to consider for hypoid gears, English include materials of construction and mounting.  Materials of construction can be metal or plastic.  Gears are made from a wide variety of materials with many different properties. Factors such as design life, power transmission requirements, noise and heat generation, and presence of corrosive elements contribute to optimization of gear material. Consult with a gear manufacturer on a specific application for the best material.  Hypoid gears can be mounted on a hub or shaft.  A hub is a cylindrical projection on one or both sides of gear, often for the provision of a screw or other shaft attachment mechanism. Hubless gears are typically attached via press fit, adhesive, or internal keyway.  Shaft mounting choices include keyway, set screws, hub claming screws, split, and simple bore.

• Hypoid Gear Set Combines High Reduction and Compactness
  Known as the Dyna Series, the new design offers a 15:1 reduction ratio. That's reportedly the highest hypoid gear reduction ratio ever available for motion control applications. Typically, hypoid...
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• Mechanical Design Handbook 2nd Edition
  This Second Edition of the Mechanical Design Handbook has been completely reorganized from its previous edition and includes seven chapters from the Mechanical Design and Systems Handbook, the...
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• Details of Involute Gearing
  1. Face Gear This is a pseudobevel gear that is limited to 900 intersecting axes. The face gear is a circular disc with a ring of teeth cut in its side face; hence the name face gear. Tooth elements...
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Part Numbers for Hypoid Gears