Hypoid

Hypoid

A hypoid is a type of spiral bevel gear whose axis does not intersect with the axis of the meshing gear. The shape of a hypoid gear is a revolved hyperboloid, whereas the shape of a spiral bevel gear is normally conical. The hypoid gear places the pinion off-axis to the crown wheel (ring gear) which allows the pinion to be larger in diameter and have more contact area. In most passenger cars, the pinion is offset to the bottom of the crown wheel. This provides for longer tooth contact and allows the propeller shaft that drives the pinion to be lowered, reducing the "hump" intrusion in the passenger compartment floor.

A hypoid gear incorporates some sliding and can be considered halfway between a straight-cut gear and a worm gear. Special gear oils are required for hypoid gears because the sliding action creates extreme pressure between the teeth.

Hypoid Gearings are used in power transmission products that are more efficient than conventional worm gearing.

ee also

*Offset (gears)

References


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  • hypoid — [ hʌɪpɔɪd] (also hypoid gear) noun a bevel wheel with teeth engaging with a spiral pinion mounted at right angles to the wheel s axis, used to connect non intersecting shafts in vehicle transmissions. Origin 1920s: perh. a contr. of hyperboloid …   English new terms dictionary

  • hypoid gear — [hī′poid΄] n. [contr. < hyperboloidal < HYPERBOL(A) + OID + AL] a curved tooth bevel gear in a system in which the axis of the driving shaft does not intersect with the axis of the driven shaft …   English World dictionary

  • hypoid axle — A driving axle with a hypoid gear …   Dictionary of automotive terms

  • hypoid oil — A special lubricant for hypoid gears …   Dictionary of automotive terms

  • hypoid gear — noun also hypoid ( s) : one of a pair of bevel gears that are used especially in automotive transmissions, are designed so that the axis of the pinion does not intersect the axis of the gear, and have the teeth on the pinion cut spirally and the… …   Useful english dictionary

  • hypoid — hy·poid …   English syllables

  • hypoid — /ˈhaɪpɔɪd/ (say huypoyd) adjective relating to a gear system, the cogs of which have tooth shapes generated by a hypocycloidal curve; much used in car transmissions. {shortened form of hypocycloid} …  

  • hypoid — n. a gear with the pinion offset from the centre line of the wheel, to connect non intersecting shafts. Etymology: perh. f. HYPERBOLOID …   Useful english dictionary

  • hypoid gear — /huy poyd/ a gear resembling a bevel gear in form but designed to mesh with a similar gear in such a way that their axes would not intersect, one axis crossing over the other at approximately a right angle. [1925 30; HYP(ERBOL)OID] * * * …   Universalium

  • hypoid gear — A type of spiral bevel gear in which the drive pinion shaft is located below the center of the ring gear. This setup is used to lower the height of the driveshaft and thus lower the floor of the vehicle …   Dictionary of automotive terms

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