# base circle

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## base circle

[′bās ‚sər·kəl]
(design engineering)
The circle on a gear such that each tooth-profile curve is an involute of it.
References in periodicals archive ?
Provision of dives and cleaning rooms catering for the benefit of the Joint Staff of the base circle of defense at the meeting
2], the eccentricity is e and the base circle of cam is R.
When the radius of involutes base circle and the offset circle of cam are equal, the cam profile can lead zero pressure angle with the roller reducing the stress on guide sleeve.
The base circle radii for pinion and gear can be obtained as:
j] (j=1 ,2) = radius of pitch circle: (1=1) for pinion; (j=2) for gear rbij (i=c, d, j=1,2) = radius of base circles
The profile called "direct profile" belongs to the positive side of an involute with the base circle diameter dbd--the direct profile base circle diameter.
The profile called "inverted profile" belongs to the negative side of an involute with the base circle diameter dbi--the inverted profile base circle diameter.
The most important geometrical parameter of asymmetric gears is the coefficient of asymmetry "k" defined as the ratio between the base circle diameter of the inactive flank and the base circle diameter of the active flank (Litvin et al.
The contour required for the scroll compressors, known as an "involute", is defined with reference to a base circle.
One of the most important parameters of asymmetric gears is the coefficient of asymmetry, noted with "k" and defined as the ratio between the base circle diameter of the inactive flank and the base circle diameter of the active flank (Kapelevich, A.
The newly configured cam lobes have a base circle, flank, and nose.
The custom roller cam built by Comp Cams uses oversize 55mm roller-style cam bearings as well as oversize lobes with larger base circles.

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