Involute Gear Software
Involute Gear Program (IGP) was developed to rapidly design new gear sets, or analyze existing gear sets. The manufacturing tooling is linked to the gear design, to prevent designing gears which cannot be manufactured. The gear data output tables, including tolerances, and are ready to be directly added to the gear detail drawings. The following online calculator computes the basic dimensions and tooth profile of an involute gear based on its module, number of teeth and pressure angle (the latter is usually 20°). A gear wheel can be fully defined with as few as two parameters: the number of teeth ( z ) and module ( m ). Gear Design and Engineering. The following are equations and engineering design calculator to determine critical design dimensions and features for an involute gear. Nov 06, 2018 I replicated an Involute Gear. It says m=2, I couldn’t find how m value is decided? It also says number of teeth N = P/m =76/2 = 38. P is a pitch diameter. I do not know why they call it pitch diameter. Tutorial: How to model involute gears in SolidWorks and show design intent. Involute Gear Program (IGP) was developed to rapidly design new gear sets, or analyze existing gear sets. The manufacturing tooling is linked to the gear design, to prevent designing gears which cannot be manufactured. The gear data output tables, including tolerances, and are ready to be directly added to the gear detail drawings. The code behind the online involute spur gear builder determines the tooth profile by simulating how a gear with infinite radius (aka rack) would cut into a smaller gear as discussed by Michal Zalewki. The advantage of the infinite gear is that it has a very simple trapezoidal tooth form solely defined by the addendum height and the pressure angle. Gear Generator is a tool for creating involute spur gears and download them in DXF or SVG format. In addition it let you compose full gear layouts with connetcted gears to design multiple gears system with control of the input/output ratio and rotation speed.
The involute gear profile is the most commonly used system for gearing today, with cycloid gearing still used for some specialties such as clocks. In an involute gear, the profiles of the teeth are involutes of a circle. (The involute of a circle is the spiraling curve traced by the end of an imaginary taut string unwinding itself from that stationary circle called the base circle.)
The involute gear profile was a fundamental advance in machine design, since unlike with other gear systems, the tooth profile of an involute gear depends only on the number of teeth on the gear, pressure angle, and pitch. That is, a gear's profile does not depend on the gear it mates with. Thus, n and m tooth involute spur gears with a given pressure angle and pitch will mate correctly, independently of n and m. This dramatically reduces the number of shapes of gears that need to be manufactured and kept in inventory.
In involute gear design contact between a pair of gear teeth occurs at a single instantaneous point (see figure at right) where two involutes of the same spiral hand meet. Contact on the other side of the teeth is where both involutes are of the other spiral hand. Rotation of the gears causes the location of this contact point to move across the respective tooth surfaces. The tangent at any point of the curve is perpendicular to the generating line irrespective of the mounting distance of the gears. Thus the line of the force follows the generating line, and is thus tangent to the two base circles, and is known as the line of action (also called pressure line or line of contact). When this is true, the gears obey the fundamental law of gearing:[1]
The angular velocity ratio between two gears of a gearset must remain constant throughout the mesh.
Gear Involute Equation
This property is required for smooth transmission of power with minimal speed or torque variations as pairs of teeth go into or come out of mesh, but is not required for low-speed gearing.
Where the line of action crosses the line between the two centres it is called the pitch point of the gears, where there is no sliding contact.
The pressure angle is the acute angle between the line of action and a normal to the line connecting the gear centers. The pressure angle of the gear varies according to the position on the involute shape, but pairs of gears must have the same pressure angle in order for the teeth to mesh properly, so specific portions of the involute must be matched.
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While any pressure angle can be manufactured, the most common stock gears have a 20° pressure angle, with 14½° and 25° pressure angle gears being much less common.[2] Increasing the pressure angle increases the width of the base of the gear tooth, leading to greater strength and load carrying capacity. Decreasing the pressure angle provides lower backlash, smoother operation and less sensitivity to manufacturing errors.[3]
Most common stock gears are spur gears, with straight teeth. Most gears used in higher-strength applications are helical involute gears where the spirals of the teeth are of different hand, and the gears rotate in opposite direction.
Only used in limited situations are helical involute gears where the spirals of the teeth are of the same hand, and the spirals of the two involutes are of different 'hand' and the line of action is the external tangents to the base circles (like a normal belt drive whereas normal gears are like a crossed-belt drive), and the gears rotate in the same direction,[4] such as can be used in limited-slip differentials[clarification needed][5][6] because of their low efficiencies.
References[edit]
Involute Gear Software For Pc
- ^Norton, R.L., 2006, Machine Design: An Integrated Approach, 3rd Ed, Pearson/Prentice-Hall, ISBN0-13-148190-8
- ^Juvinall, R.C. and K.M. Marshek, 2006, Fundamentals of Machine Component Design, 4th Ed, Wiley, ISBN978-0-471-66177-1, p. 598
- ^Boston Gear Company, Open Gearing Catalog, http://bostongear.com/products/open-gearing/stock-gears/spur-gears/spur-gears
- ^Professor Jacques Maurel, 'Paradoxical Gears', http://www.jacquesmaurel.com/gears
- ^Jacques Mercier, Daniel Valentin US Patent 4831890
- ^ Arthur J. Fahy, Neil Gillies US Patent 5071395