Spur gear terminology

For a cylindrical gear, effective face width is the portion that contacts the mating teeth. Reasons for requiring backlash include allowing for lubrication and thermal expansion , and to prevent jamming. The tooth number in the numerator are those of the driven gears, and the tooth numbers in the denominator belong to the driver gears. A harmonic gear or strain wave gear is a specialized gearing mechanism often used in industrial motion control , robotics and aerospace for its advantages over traditional gearing systems, including lack of backlash, compactness and high gear ratios. These attributes give it screw like qualities.

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Apply the equation of velocity ratio of the ordinary gear trains to the imagined mechanism.

A line normal to a pair of mating tooth profiles at their point of contact. The addendum is the height by which a tooth of a gear projects beyond outside for external, or inside for internal the standard pitch circle or pitch line ; also, the radial distance between the pitch diameter and the outside diameter. This page was last edited on 27 October geaar, at The force, which the driving tooth gearr at point of contact of the two teeth.

Basic Gear Terminology and Calculation

Figure Ordinary gear trains 7. Relevant discussion may be found on the talk page.

Initial Stage Pitting The initial cause comes from small convex portions of the gear surfaces contacting each other and the local load exceeding the fatigue limit. Portion of the arc of contact from the pitch point to the end of engagement is the arc of recess i.

List of gear nomenclature

Spiral bevel gears terminolohy be manufactured as Gleason types circular arc with non-constant tooth depthOerlikon and Curvex types circular arc with constant tooth depthKlingelnberg Cyclo-Palloid Epicycloid with constant tooth depth or Klingelnberg Palloid. Their shaft axes also intersect at this point, forming an arbitrary non-straight angle between the geag.

The outside diameter of a gear is the diameter of the addendum tip circle. This condition tends to occur when operating at very low speed and high load. It is the reciprocal of module. Nomenclature of spur gear: Domestic American clock movements often used them.

The surface of the gear blank at the outer ends of the termimology is customarily formed to such a back cone. Note that the smaller gear is rotating faster.

From Wikipedia, the free encyclopedia. For example, helical gears are normally limited to gear ratios of less than A properly designed plastic gear can replace steel in many cases because it has many desirable properties, including dirt trrminology, low speed meshing, the ability to "skip" quite well [30] yerminology the ability to be made with materials that don't need additional lubrication.

The thickness of the tooth measured along a chord passing through the points where the Pitch Circle crosses the tooth profile. Torque can be converted to linear force by meshing a rack with a pinion: Camshaft is a type of rotating device or apparatus used in piston engines for propelling tefminology operating poppet valves.

For an observer looking at the reference face, so that the tooth is seen with its tip uppermost, the right flank is on the right and the left flank is on the left.

An imaginary circle used in involute gearing to generate the involutes that form the tooth profiles. Quite commonly, helical gears are used with the helix angle of one having the negative of the helix angle of the other; such a pair might also be referred to as having a right-handed helix and a left-handed helix of terkinology angles.

Science and Civilization in China: Cycloidal gears only work properly if the center spacing is exactly right.

Terminology of Spur Gear ~ Mechanical Engineering

Please discuss this issue on the article's talk page. Pitch diameter divided by number of teeth. The axes may be parallel, intersecting, neither parallel nor intersecting. The majority of calculations for spur gears can be applied to helical gears too. The central plane of a worm gear is perpendicular to the gear axis and contains the common perpendicular of the gear and worm axes. Simple Gear Train- The simple gear train is used where there is a large distance to be covered between the input shaft and the output shaf The heel of a tooth on a bevel gear or pinion is the portion of the tooth surface near its outer end.

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