An imaginary circle concentric to a toothed wheel, along which the pitch of the teeth is measured.
〔力〕（齿轮的）节圆
Example sentencesExamples
The hypoid gears used in conventional axles do not have a true pitch circle since both sliding and rolling occurs at the teeth and the gears could not be replaced with frictional disks.
The velocity ratio is equal to the inverse ratio of the diameters of pitch circles.
Definition of pitch circle in US English:
pitch circle
noun
Mechanics
An imaginary circle concentric to a toothed wheel, along which the pitch of the teeth is measured.
〔力〕（齿轮的）节圆
Example sentencesExamples
The velocity ratio is equal to the inverse ratio of the diameters of pitch circles.
The hypoid gears used in conventional axles do not have a true pitch circle since both sliding and rolling occurs at the teeth and the gears could not be replaced with frictional disks.