Viva Questions and Answer on Gear Terminology
Q. What is a Gear?
A mechanical component that transmits power and motion between machines.
Q. What is Pitch Circle?
A circle that passes through the gear tooth and its pitch point.
Q. What is Pitch Point?
The point where the tooth space and tooth flank meet on a gear.
Q. What is Pitch Diameter?
The diameter of the pitch circle of a gear.
Q. What is Pressure Angle?
The angle between the line of action and the common normal to the pitch surfaces.
Q. What is Addendum?
The height of the gear tooth above the pitch circle.
Q. What is Dedendum?
The depth of the gear tooth below the pitch circle.
Q. What is Face Width?
The distance from one tip to the other tip of a gear tooth.
Q. What is Module?
The ratio of the number of teeth to the pitch diameter in millimeters.
Q. What is Tooth Profile?
The shape of a gear tooth when viewed from its end.
Q. What is Root Diameter?
The diameter of the bottom of a gear tooth at the root.
Q. What is Circular Pitch?
The distance from a point on one gear tooth to the corresponding point on the next gear tooth, measured along the pitch circle.
Q. What is Helix Angle?
The angle between the gear tooth profile and a plane perpendicular to the axis of rotation.
Q. What is Backlash?
The clearance between meshing gears, causing a loss of torque and decreased precision.
Q. What is Center Distance?
The distance between the center lines of two meshing gears.
Q. What is Gear Ratio?
The ratio of the number of teeth on the driven gear to the number of teeth on the driver gear.
Q. What is Gear Train?
A series of gears that transmit power and motion between different shafts.
Q. What is Crown Gear?
A gear with a convex tooth profile, used to transfer power around corners.
Q. What is Pinion?
A small gear that drives a larger gear.
Q. What is Worm Gear?
A gear with a screw-shaped gear that drives a gear with straight teeth.
Q. What is Rack and Pinion?
A gear system consisting of a linear gear (the rack) and a rotating gear (the pinion).
Q. What is Bevel Gear?
A gear with conical teeth used to transmit power between intersecting shafts.
Q. What is Spiral Bevel Gear?
A bevel gear with a spiral tooth form to improve tooth contact.
Q. What is Hypoid Gear?
A type of bevel gear with offset shafts, allowing for larger gear ratios.
Q. What is Harmonic Drive?
A type of gear system with flexible gears to provide high accuracy and low backlash.
Q. What is Planetary Gear?
A type of gear system with multiple gears rotating around a central gear.
Q. What is Gearbox?
A device that contains gears to increase or reduce the speed and torque of a rotating shaft.
Q. What is Gear Efficiency?
The fraction of input power that is converted into useful output power in a gear system.
Q. What is Load Sharing?
The distribution of load between multiple gears in a gear train.
Q. What is Gear Mesh?
The contact between gear teeth in a meshed gear system.
Q. What is Lead?
The linear distance a gear tooth travels in one revolution.
Q. What is Tooth Flank?
The side of a gear tooth, excluding the top and bottom.
Q. What is Overlap?
The amount of overlapping between gear teeth during meshing.
Q. What is Center Distance Adjustment?
The process of adjusting the center distance between meshing gears.
Q. What is Tooth Root?
The base of a gear tooth where it joins the gear body.
Q. What is Tooth Depth?
The distance from the tip to the root of a gear tooth.
Q. What is Tooth Progression?
The distribution of gear teeth around the circumference of a gear.
Q. What is Tooth Contact Pattern?
The pattern formed by the points of contact between gear teeth during meshing.
Q. What is Gear Cutting?
The process of manufacturing gear teeth on a gear blank.
Q. What is Gear Grinding?
The process of shaping gear teeth by removing material with a grinding wheel.