End surface──a plane perpendicular to the axis of a gear or worm on a cylindrical gear or cylindrical worm.


normal plane──On a gear, the flange refers to a plane perpendicular to the tooth line.


Tooth top Circle──the circle where the top of the tooth is located.


Tooth root circle──the circle where the bottom of the groove is located.


 base circle──A circle in which the occurrence line of an asymptotic overcoat out is a pure rolling.


Pitch Circle──a reference circle for calculating the geometric dimensions of gears in the end surface, and for straight gears, the modulus and pressure angle are standard values on the fractal circle.


Tooth surface──the side surface between the tooth top cylindrical surface and the tooth root cylindrical surface on the gear.


Tooth profile──the truncated line at which the tooth surface is truncated by a specified surface (a plane to a cylindrical gear).


Tooth line──the intersection of the tooth surface and the pitch cylindrical surface.


 transverse pitch──The dividing arc length between two adjacent teeth and the tooth profile on the same side of the end face


modulus──The quotient of the tooth spacing divided by the circumference pi, in millimeters.


diametral pitch p── modulus of the diameter section, in inches.


tooth thicknesss── The dividing arc length between two tooth profiles of a gear tooth on the end face


groove width e── the length of the fractal arc between the sides of the tooth groove on the end surface.


 tooth addendumhɑ──The radial distance between the tooth top circle and the fractal circle.


tooth dedendum hf── The radial distance between the fractal circle and the tooth root circle.


total depth h── The radial distance between the tooth top circle and the tooth root circle.


 tooth width b── The size of the gear along the axial.


Angle of end pressure ɑt── The radial line between the end tooth profile and the intersection of the fractal circle and the sharp angle clamped by the tooth profile tangent over the point.


Standard Rack: Base circle size, tooth shape, full tooth height, crown height and tooth thickness and other dimensions are in line with the standard positive gear specifications of the rack, according to its standard gear specifications cut out of the rack called the reference rack.


Standard Pitch Circle: Used to determine the size datum circle of the gears. For the number of teeth x modulus.


Standard Pitch Line: A specific section line on the rack or the thickness of the tooth measured along this line, which is one-second of the pitch.


Action Pitch Circle: When a pair of positive gears bite, each has a phase cut to do the rolling circle.


Standard Pitch: The base is the reference for the selected Standard pitch, which is equal to the base rack pitch.


Pitch Circle: The track left on each gear at the occlusion contact point of the two gears' concentric line is called the pitch circle


Pitch Diameter: round diameter.


Working Depth: A pair of positive gear crown height and. Also known as high working teeth.


Addendum: The radius difference between the crown circle and the pitch circle.


Backlash: When two teeth bite, the tooth surface and the tooth surface gap.


Clearance: When two teeth bite, the gap between the top circle of one gear tooth and the bottom of another gear.


Pitch point: A pair of gear bites tangent to the knuckle phase.


Pitch: the corresponding arc distance between two adjacent teeth.


Normal Pitch: The pitch measured by the involute gear along the same vertical line of a particular section.

Transmission ratio ( ): Compared with the speed ratio of the two gears, the speed of the gears is inversely proportional to the number of teeth, and the speed of the number of two meshing teeth is generally indicated by N1 and N2.


Previous: Gear Drive

Next: Bevel Gear

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