gear term
Tooth (teeth) - Each raised part of a gear used to mesh. Generally, these raised portions are arranged in a radial pattern. The teeth on the mating gears contact each other, resulting in a continuous meshing operation of the gears.
Cogging - The space between two adjacent teeth on a gear.
gear
gear
End face - a plane perpendicular to the axis of the gear or worm on a cylindrical gear or cylindrical worm.
Normal plane - On a gear, the normal plane refers to the plane perpendicular to the tooth line of the gear teeth.
Addendum Circle - The circle where the tooth tips are located.
Root circle - the circle where the groove bottom is located.
Base circle—a circle on which the occurrence line forming the involute is made pure rolling.
Index circle—a reference circle for calculating the geometric dimensions of the gear in the end face. For spur gears, the modulus and pressure angle on the index circle are standard values.
Tooth surface - the side surface of the gear tooth between the top cylindrical surface and the tooth root cylindrical surface.
Tooth Profile—The line where the tooth flank is intercepted by a specified surface (a plane for cylindrical gears).
Tooth line - the intersection of the tooth surface and the indexing cylindrical surface.
End face tooth pitch pt——the indexing arc length between the tooth profiles on the same side of the adjacent two teeth.
Modulus m——The quotient obtained by dividing the tooth pitch by pi, in millimeters.
Diameter P—the reciprocal of the modulus, in inches.
Tooth thickness s——The length of the indexing arc between the tooth profiles on both sides of a gear tooth on the end face.
Slot width e——The length of the indexing arc between the tooth profiles on both sides of a tooth slot on the end face.
Addendum height hɑ——The radial distance between the addendum circle and the index circle.
Root height hf——The radial distance between the index circle and the root circle.
Total tooth height h——The radial distance between the tip circle and the root circle.
Tooth width b——the size of the gear teeth along the axial direction.
End face pressure angle ɑt── the acute angle formed by the radial line passing through the intersection of the end face tooth profile and the index circle and the tooth profile tangent passing through this point.
Standard Rack: Only the dimensions of the base circle, tooth shape, full tooth height, tooth crown height and tooth thickness are in line with the standard spur gear specifications, and the rack is cut according to its standard gear specifications It is called the reference rack.
Standard Pitch Circle: It is used to determine the reference circle of the size of each part of the gear. It is the number of teeth x modulus
Standard Pitch Line: A specific pitch line on the rack or the tooth thickness measured along this line, which is one-half of the pitch.
Action Pitch Circle: When a pair of spur gears mesh, each has a tangent to make a rolling circle.
Standard Pitch: The selected standard pitch is used as the benchmark, which is equal to the standard rack pitch.
Pitch Circle: The track left on each gear at the occlusal contact point on the connecting center line of the two gears is called the pitch circle.
Pitch Diameter: The diameter of the pitch circle.
Effective tooth height (Working Depth): the sum of the crown height of a pair of spur gears. Also known as the working tooth height.
Addendum: the difference between the tip circle and the pitch circle radius.
Backlash: The gap between the tooth surface and the tooth surface when the two teeth are engaged.
Clearance: When two teeth are engaged, the gap between the top circle of one gear and the bottom of the other gear.
Pitch Point: The point where a pair of gears meshes with the pitch circle.
Pitch: The distance between the corresponding point arcs between two adjacent teeth.
Normal pitch (Normal Pitch): the pitch of the involute gear measured along the same vertical line of a specific section.
Transmission ratio ( ): The ratio of the speed of the two meshing gears. The speed of the gear is inversely proportional to the number of teeth. Generally, n1 and n2 represent the speed of the two meshing teeth.
