Global Gears Information
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Gear GlossaryActive profile - Is that part of the gear tooth that actually comes into contact with its mating tooth along the line of action. Addendum - The height of the tooth above the pitch circle diameter. Angular bevel gears - Are bevel gears in which the axes are not at right angles. Axle - A round, hollow metal bar on which the rear wheels are mounted on. Axial load bearing - A bearing in which the load acts in the direction of the axis of rotation. Axial pitch - Is the distance in an axial plane surface between corresponding adjacent tooth profiles. Axial pressure angle - Is the angle between the tangent to the tooth profile in an axial plane at the pitch surface and a line perpendicular to the axis. Backlash - A strong and sudden reverse movement in a moving part of a machine. Base circle - An imaginary circle used in involut gearing to generate the involutes that form the tooth profiles. Base lead angle - Is the lead angel between the base cylinder. Bevel gears - Are gears of conical form designed to operate on intersecting axes. Center distance - The distance between axes of two gears in mesh. Circular pitch - Is the distance on the circumference of the pitch circle between the corresponding points of adjacent teeth. Circular thickness - The thickness at the point where the gear engages. Clearence - The difference between the dedendum of one gear and the addendum of the mating gear. Cogwheel - A wheel with a rim notched into teeth, which meshes with those of another wheel or a rack to transmit or receive motion. Common tangent - The line tangent to the pitch circle at the pitch point. Dedendum - The depth of the tooth below the pitch circle diameter. Diametrical pitch - The number of teeth per one inch of the pitch circle diameter. Differential gear - A bevel gear that permits rotation of two shafts at different speeds. Double helical gear - Is a gear of cylindrical form with two sections of teeth that engage simultaneously with teeth of similarly designed mating gear. External gear - The simplest gear systems with cylindrical gears and teeth parallel to the axis. Face gear - It is a gear with cogs mortised into its face, usually in conjugation with a lantern pinion. Face width - Is the width of the pitch surface. Gears - It is a toothed machine part that meshes with another toothed part to transmit motion or to change speed or direction. Gear center - Iis the center of pitch circle. Gear box - The manual transmission on a shifter kart. Gear ratio - It is the ratio between number of teeth of the meshing gears. Gear train - A gear train is two or more gear working together by meshing their teeth and turning each other in a system to generate power and speed. Helical gear - Is a cylindrical gear with helical teeth. Idler gear - A gear wheel placed between two other gears to transmit motion from one to the other. Involute - Is the curve described by the end of a line that is unwound from the circumference of a circle. Internal gears - Gears that have cylindrical pith surface with teeth parallel to the axis. Line of action - Is that portion of the common tangent to the base circles along which contact between the mating involute teeth occurs. Line of contact - Is the line or curve along which two tooth surfaces are tangent to each other. Miter gear - Bevel gears put together with equal numbers of teeth and axes that are usually at right angles. Module - Is the ratio of the pitch diameter to the number of teeth. Path of contact - The path traced by the contact point of a pair of tooth profiles. Pawl - A mechanical device allowing rotation in only one direction. Pinion - A small cogwheel, the teeth of which fit into those of larger gearwheel or those of a rack. Pitch circle - Is the circle through the pitch point having its center at the axis of the gear. Pitch diameter - Is the diameter of the pitch circle. Pitch radius - Is the radius of the pitch circle. Planetary gears - A device allowing several gears to orbit about others. Pressure angle - The angle between the tooth profile at the pitch circle diameter and a radial line passing through the same point. Rack gear - It is a gear of infinite pitch radius into which a pinion meshes. Ratchet - A toothed wheel or bar that catches and holds a pawl, which thus prevents backward movement. Spiral bevel gears - Designed for an angle change of 90 degrees, where the two axes are concurrent and in the same plane. Sprockets - Are teeth like projections arranged on a wheel rim to engage the links of a chain. Spur gear - They connect parallel shafts, have involute teeth that are parallel to the shaft and can have internal or external teeth. Sun gear - Small gearwheel that revolves around its own axis and also around a gear meshing with it. Velocity ratio - The ratio of the number of revolutions of the driving gear to the number of revolutions of the driven gear, in a unit of time. Whole depth - Is the radial distance between outside circle and the root circle. Working depth - Is the greatest depth to which a tooth of one gear extends into the tooth gear of the mating gear. Worm gear - It is a gea with one or more teeth in the form of screwed threads. Zerol bevel gears - Is a bevel gear with intersecting shafts. Gear
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