SPUR GEAR TERMINOLOGY EBOOK

The addendum is the height by which a tooth of a gear projects beyond the standard pitch circle The term bull gear is used to refer to the larger of two spur gears that are in engagement in any machine. The smaller gear is usually referred to. Pitch circle: A normal section of the pitch surface. Addendum circle: A circle bounding the ends of the teeth, in a normal section of the gear. Dedendum circle or Root circle: The circle bounding the spaces between the teeth, in a normal section of the gear. Spur Gear Terms and Concepts. Description. In order to design, build and discuss gear drive systems it is necessary to understand the terminology and concepts.


SPUR GEAR TERMINOLOGY EBOOK

Author: Jewell King
Country: Algeria
Language: English
Genre: Education
Published: 18 August 2014
Pages: 751
PDF File Size: 15.42 Mb
ePub File Size: 12.77 Mb
ISBN: 363-5-48243-434-1
Downloads: 74007
Price: Free
Uploader: Jewell King

Download Now
SPUR GEAR TERMINOLOGY EBOOK

The radial distance between the pitch circle and the root circle. The difference between the dedendum of one gear and the addendum of the mating gear.

SPUR GEAR TERMINOLOGY EBOOK

Face of a tooth: That part of the tooth surface lying outside the pitch surface. Flank of a tooth: The part of the tooth surface lying spur gear terminology the pitch surface. Circular thickness also called the tooth thickness: The thickness of the tooth measured on the pitch circle.

It is the length of an arc and not the length of a straight line. The distance between adjacent teeth measured on the pitch circle. The difference between the circle thickness of one gear and the tooth space of the mating gear.

The width of a tooth and a space, measured on the pitch circle. Conjugate gears[ edit ] Conjugate gears transmit uniform rotary motion from one shaft to another by means of gear teeth. The normals to the profiles of these teeth, at all points of contact, must pass through a fixed point in the common centerline of the two shafts.

Crossed helical gear[ edit ] A crossed helical gear is a gear that operate on non-intersecting, non-parallel axes. The term crossed helical gears has superseded the term spiral gears. There is theoretically point contact between the teeth at any instant. Fatigue Breakage This is the case in which the root portions of gear are subjected to a repeated load exceeding the material's fatigue limit.

A fracture that starts in the corner of the gear root propagates until the tooth breaks. The fractured surface is relatively smooth spur gear terminology the starting point can often be recognized by the beach mark shell pattern around it. Shear Breakage This describes when a tooth separates from the body by shearing due to a one time extreme overload.

The breakage is straight in the circumferential direction and appear flat as if machined. The nearby area shows plastic deformation.

Terminology of Spur Gear ~ Mechanical Engineering

spur gear terminology The point of tangency of the pitch circles of a pair of spur gear terminology gears. The line tangent to the pitch circle at the pitch point.

An imaginary circle used in involute gearing to generate the involutes that form the tooth profiles. The force, which the driving tooth exerts at point of contact of the two teeth. This line is also the common tangent at the point of contact of the mating gears and is known as the line of action or the pressure line.

Terminology for Spur Gears | Kinematics of Machines Tutorials

The component of the force along the common tangent at the p point is responsible for the power transmission. The component of the force perpendicular to the common tangent through the pitch point produces the required thrust.

The angle between pressure line and the common tangent to the pitch circles is known as the pressure angle or the angle of obliquity. Teeth per mm of diameter. The working surface of spur gear terminology gear tooth, located between the pitch diameter and the top of spur gear terminology tooth.

The width of the tooth measured parallel to the gear axis. The working surface of a gear tooth, located between the pitch diameter and the bottom of the teeth Gear:



Other: