Metal working – Method of mechanical manufacture – Gear making
Reexamination Certificate
2007-03-20
2007-03-20
Joyce, William C. (Department: 3682)
Metal working
Method of mechanical manufacture
Gear making
C074S457000, C074S462000
Reexamination Certificate
active
10360290
ABSTRACT:
The present invention provides for bevel gears having a localized and stable bearing contact. The localization of bearing contact is achieved by substitution of flat tooth surfaces with parabolic tooth surfaces. This is accomplished by either modifying line-contact directly or by using a generating parabolic cylinder during generation of the tooth surfaces. The actual contact area is spread over an ellipse centered around an instantaneous theoretical point of contact at the apex of the parabolic tooth surface. This localized bearing contact reduces the shift of the bearing due to assembly and manufacturing errors, thereby providing a more durable and quieter gear. Furthermore, the geometry of the gear enables creation of dies from which the gear may be forged. Transmission errors are modeled using a pre-designed parabolic function that coincides with the parabolic tooth surface design of the present invention.
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Barrett Theresa
Litvin Faydor L.
Sofia John
Zhao Xiangshun
American Axle & Manufacturing Inc.
Harness & Dickey & Pierce P.L.C.
Joyce William C.
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