A spiral bevel gear is a bevel gear with helical teeth. The helical design produces less vibration and noise than a conventional straight cut bevel gear. They will transmit more power in a given space than straight cut bevel gears. A spiral bevel gear set should always be replaced in pairs i.e. both the left hand and right hand gears should be replaced together since the gears are manufactured and lapped in pairs. Like straight cut bevel gears, spiral bevel gears are usually mounted at 90 degrees but can work  at other angles except 0 and 180 degrees.

The main application of spiral bevel gears is in a vehicle crown wheel and pinion that houses the differential, where the direction of drive from the drive shaft must be turned 90 degrees to drive the wheels. They are also used in machine tools and reduction gearboxes.

Our machine cuts a parallel depth system with a maximum cone distance of 330mm (13 inches), minimum 50mm (2 inches) with a face width no greater than 1/3 of cone distance. Maximum pitch 12MOD (2DP, 1.57 inches circular pitch) 20 deg PA, Minimum 2MOD (12DP, 0.26 inch) 20 deg PA .

Hewitt & Topham Limited, Dyneley Road, Greenbank Business Park, Blackburn BB1 3AB United Kingdom
Tel: +44 (0) 1254 679222  Fax : +44 (0) 1254 680534  Email: sales@hewitt-topham.co.uk

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