(Gears)
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The strength of gears is generally expressed in terms of bending strength and surface durability. These are independent criteria which can have differing criticalness, although usually both are... (View Full Article)
(Gears)
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Plastic gears are continuing to displace metal gears in a widening arena of applications. Their unique characteristics are also being enhanced with new developments, both in materials and processing.... (View Full Article)
(Gears)
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1. Face Gear This is a pseudobevel gear that is limited to 900 intersecting axes. The face gear is a circular disc with a ring of teeth cut in its side face; hence the name face gear. Tooth elements... (View Full Article)
(Gears)
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Bevel gears have tapered elements because they are generated and operate, in theory, on the surface of a sphere. Pitch diameters of mating bevel gears belong to frusta of cones, as shown in Figure... (View Full Article)
(Gears)
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Tooth surface contact is critical to noise, vibration. efficiency, strength, wear and life. To obtain good contact, the designer must give proper consideration to the following features:... (View Full Article)
(Gears)
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In Figure 5-2 the gear train has a difference of numbers of teeth of only 1; z1 = 30 and z2 = 31. This results in a reduction ratio of 1/30. SECTION 6 HELICAL GEARS The helical gear differs from the... (View Full Article)
(Gears)
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Crowning is the removal of a slight amount of tooth from the center on out to reach edge, making the tooth surface slightly convex. This method allows the gear to maintain contact in the central... (View Full Article)
(Gears)
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In designing a gear, it is important to analyze the magnitude and direction of the forces acting upon the gear teeth, shaft, bearings, etc. In analyzing these forces, an idealized assumption is made... (View Full Article)
(Power Transmission)
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There are several causes of noise. The noise and vibration in rotating gears, especially at high loads and high speeds, needs to be addressesd. Following are ways to reduce the noise. These points... (View Full Article)
(Gears)
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This section presents a technical coverage of gear fundamentals. It is intended as a broad coverage written in a manner that is easy to follow and to understand by anyone interested in knowing how... (View Full Article)
(Gears)
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The purpose of lubricating gears is as follows: 1. Promote sliding between teeth to reduce the coefficient of friction (m). 2. Limit the temperature rise caused by rolling and sliding friction. To... (View Full Article)
(Gears)
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Due to the thermal expansion of plastic gears, which is significantly greater than that of metal gears, and the effects of tolerances, one should make sure that meshing gears do not bind in the course... (View Full Article)
(Gears)
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3.21 Contact Ratio To assure smooth continuous tooth action, as one pair of teeth ceases contact a succeeding pair of teeth must already have come into engagement. It is desirable to have as much... (View Full Article)
(Gears and Gearing)
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In the following text, main consideration will be given to Nylon MC901 and Duracon M90, However, the basic equations used are applicable to all other plastic materials if the appropriate values for... (View Full Article)
(Gears and Gearing)
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This information is applicable for worm gear drives that are used to transmit power in general industrial machines with the following parameters.... (View Full Article)
(Gears and Gearing)
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The following equations can be applied to both spur and helical gears, including double helical and internal gears, used in power transmission. The general range of application is:... (View Full Article)
(Power Transmission)
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When designing a mechanism that requires threaded holes, it is suggested that you use a reference table to accurately select the proper thread size for your application.... (View Full Article)
(Gears)
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In the design of geartrains it is critical to know the tolerance of the bore of the gear in order to specify the proper shaft. This table details the values assigned to the letter codes for various... (View Full Article)
(Power Transmission)
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When designing a mechanical assembly with metric dimensions there is a standard for the tolerances of the shaft sizes that can be considered. These tolerances are dictated by one or more international... (View Full Article)
(Drive Components)
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When designing a shaft or other desing component which does not have a thru bore, the use of a center is commonly used to permit the use of lathe to work the piece. The enclosed table details the... (View Full Article)
(Gears)
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Gear pitch can be defined as Diametral Pitch, Module or Circular Pitch. The enclosed table details the common sizes for all three pitch profiles and their equivalency to the other pitch profiles.... (View Full Article)
(Drive Components)
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When designing a drive system, the use of keys and keyways to transmit torque from the drive shaft to the gear/pulley/sprocket/coupling is common. Enclosed is a table detailing the standard metric... (View Full Article)
(Power Transmission)
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When designing a mechanism with splines and spline bushings, one of the more common styles of splines is the straight sided style. The enclosed table details the specification of standard metric... (View Full Article)
(Power Transmission)
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When designing a mechanism, there may be a requirement to secure two components. This is typically done using socket head cap screws. The enclosed table details the standardize sizes of the required... (View Full Article)
(Gears)
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Gears are some of the most important elements used in machinery. There are few mechanical devices that do not have the need to transmit power and motion between rotating shafts. Gears not only do this... (View Full Article)
(Power Transmission)
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Various hardness scales are currently in use to quantify the relative hardness of a steel product. The article approximates the relative values from different scales using the Rockwell C scale as a... (View Full Article)
(Power Transmission)
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These helical gears are also known as spiral gears. They are true helical gears and only differ in their application for interconnecting skew shafts. Screw gears can be designed to connect shafts at... (View Full Article)
(Power Transmission)
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This article displays the tensile strength, brinell hardness and carbon content of the most commonly selected steel used in Japan for the production of power transmission components.... (View Full Article)