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# Topic: Planetary gear

 Epicyclic gearing - Wikipedia, the free encyclopedia Epicyclic gearing or planetary gearing is a gear system that consists of one or more outer gears, or planet gears, rotating about a central, or sun gear. The gear ratio in an epicyclic gearing system is somewhat non-intuitive, particularly because there are several ways in which an input rotation can be converted into an output rotation. For instance, if the sun gear has 24 teeth, and each planet has 16 teeth, then the ratio is -24/16, or -3/2; this means that one clockwise turn of the sun gear produces 1.5 counterclockwise turns of the planet gears. en.wikipedia.org /wiki/Epicyclic_gearing   (949 words)

 YP Planetary Gear YP Planetary Gear is designed to assist teachers and students when they study the working of a planetary gear train. A planetary gear train is a mechanism consisting of an assembly of meshed gears: the sun gear, the planet carrier, and the ring gear. With YP Planetary Gear, you may observe the motion of a planetary gear train when one of its parts is locked. www.ncf.carleton.ca /~ch865/english/planetary.html   (249 words)

 Howstuffworks "How Gear Ratios Work" In a worm gear, a threaded shaft engages the teeth on a gear. However, imagine that you want the axis of the output gear to be the same as that of the input gear. An automatic transmission uses planetary gearsets to create the different gear ratios, using clutches and brake bands to hold different parts of the gearset stationary and change the inputs and outputs. auto.howstuffworks.com /gear-ratio4.htm   (561 words)

 Tech info on the molecular planetary gear As several important properties of the planetary gear are currently not well understood (including the maximum speed of operation that is feasible, the maximum torque that can be applied, etc) the "best" modeling conditions are not currently known. Another method of determining whether or not the planetary gear will function at a given frequency would be to start all components of the structure moving with approximately the correct velocities, and then observe the resulting behavior. A simulation of the original planetary gear in which the sungear was given an instantaneous initial rotational speed of 500 gigahertz was done at Caltech. www.zyvex.com /nanotech/gearAndCasingTech.html   (741 words)

 Automatic Transmissions A Short Course on How They Work In this scenario, when we turn the ring gear, the planets will "walk" along the sun gear (which is held stationary) causing the planet carrier to turn the output shaft in the same direction as the input shaft but at a slower speed causing gear reduction (similar to a car in first gear). To shift from first to high gear, the band is released and the clutch is applied causing the output shaft to turn at the same speed as the input shaft. Some of the clever gear arrangements found in four and now, five, six and even seven-speed automatics are complex enough to make a technically astute lay person's head spin trying to understand the flow of power through the transmission as it shifts from first gear through top gear while the vehicle accelerates to highway speed. www.familycar.com /transmission.htm   (5276 words)

 Planetary Gear Reducers   (Site not responding. Last check: 2007-10-24) Planetary Gear Reducers designed by Apex Dynamics USA are the most precise gear reducers on the market today. All Planetary Gear Reducers carry a tip to toe 5-year warranty and are guaranteed to be delivered on time or it’s free. Planetary Gear Reducers are known for the quiet and smooth operation. www.apexdynamicsusa.com /Planetary_Gear_Reducers.asp   (280 words)

 Carrier structure for planetary gear system - Patent 5593362 The flange is inserted between the internal periphery of the pinion gear and the external periphery of the pinion shaft for bearing the thrust load of the needle bearing. The boss 5a is disposed between the internal periphery of the pinion gear 3 and the external periphery of the pinion shaft 2 for supporting the thrust load of the needle bearings 4 on the needle bearing sliding surface 5b. Also, when the pinion gear 3 is rotated, the possible elements to slide relative to the boss 5a are the end face of the needle bearing 4, the external periphery of the pinion shaft 2 and the internal periphery of the pinion gear 3. www.freepatentsonline.com /5593362.html   (3893 words)

 Servo Hut,PLANETARY GEAR BOX Aluminum bolt-on planetary gearbox for Speed 400 motors with a 2.3mm shaft. Includes pinion gear, lubricating grease, motor mount screws, and screws for mounting gearbox to firewall. Gears are secured with grub screws for easy changing. www.servohut.com /planetary_gear_box.htm   (206 words)

 Planetary Gears,Planetary Gear Manufacturers,Planetary Gear,Planetary Gears Manufacturer,Wholesale Planetary Gears These small gears are called planet and they are engaged to the inside of the large gear called the ring. In a planetary gearing, the member which receives motion from outside the mechanism is called the driver; the member from which motion is taken outside the mechanism is called the follower; the member which carries one or more bearing pins about which the planet gears rotate is called the train arm. Planetary gears are also used to produce different gear ratios depending on the which gear is used as input, which one as output and which one is held stationary. www.gears-manufacturers.com /planetary-gears.html   (309 words)

 Planetary Gears A pair of spur gears is represented in the diagram by their pitch circles, which are tangent at the pitch point P. The meshing gear teeth extend beyond the pitch circle by the addendum, and the spaces between them have a depth beneath the pitch circle by the dedendum. The velocity ratio r of a pair of gears is the ratio of the angular velocity of the driven gear to the angular velocity of the driving gear. The velocity ratio of the gears does not depend on the exact spacing of the axes, but is fixed by the number of teeth, or what is the same thing, by the pitch diameters. www.du.edu /~jcalvert/tech/planet.htm   (1657 words)

 Howstuffworks "How Automatic Transmissions Work" The key difference between a manual and an automatic transmission is that the manual transmission locks and unlocks different sets of gears to the output shaft to achieve the various gear ratios, while in an automatic transmission, the same set of gears produces all of the different gear ratios. The input is the small sun gear; the ring gear (large sun gear) is held stationary by the band, and the output is the planet carrier. Reverse is very similar to first gear, except that instead of the small sun gear being driven by the torque converter turbine, the bigger sun gear is driven, and the small one freewheels in the opposite direction. auto.howstuffworks.com /automatic-transmission3.htm   (1977 words)

 Planetary Gear Units,Worm Gear Units,Manufacturers,Planetary Gear Units Suppliers The gear and shafts are made of alloy steels suitably heat treated. The gear units are machined in a CNC machining center to achieve excellent cordinates and size accuracies. The Gear Units may be a large unit or a small unit weighing less than 1 kg. www.gears-reducers.com /gear-units.html   (200 words)

 Planetary Gear Heads Planetary Gear Heads do have their uses in the industry, just as Spur Gearhead Motors do. In the process of cutting gears in Planetary Gear Heads, there is a small but inevitable error in tooth profile that is introduced by such process parameters as tool-wear. The profile error in the Planetary Gear Heads usually manifests itself in the last tooth cut on a particular gear blank. www.arcsystemsinc.com /gearheads.asp   (201 words)

 Kontronik Planetary Gear Drives Superbly machined gear drives with excellent durability and very smooth rotation. Planetary gear design with nearly maintenance-free Teflon® bearings. Unique case design is easy to open for servicing or changing of gears. www.towerhobbies.com /products/kontronik/kong2537m.html   (86 words)

 Planetary Gear Motor The name planetary is used interchangeably with epicyclic to denote the whole family of gears. The reversibility allows this power to be transmitted to the high speed end of the gear box without causing any damage to the gears, couplings or other elements in the line of power transmission. The power transmitting capacity of Planetary gear systems is higher than standard gearboxes and hence they are able to transmit greater power for a given size. www.lariissa.com /pgm.htm   (314 words)

 Planetary Gear Exporters,Planetary Gear Suppliers,Planetary Gears Exporter,Planetary Gears Supplier,Planetary Gears ...   (Site not responding. Last check: 2007-10-24) Manufacturers and suppliers of planetary gears, planetary reduction gears, sugarplant gearbox, planetary reduction gearbox, high torque gearbox, high ratio gearbox, helical gearbox, bevel helical gearbox, extruder gearbox & parallel shaft helical gearbox. Manufacturers of precision gears, spur gears, helical gears, bevel gears, worm gears, internal gears, spiral bevel gear, planetary gearbox, helical gearbox, helical crane duty gearbox, shaft mounted planetary gearbox and precision gearbox. Exporters and suppliers of gears, gearboxes, girth gears, pinion shafts, ground gears, internal gears, forged rolls, gear reducers, sugar mill gears, precision gears, helical gears, metric gears, crank shaft, reduction gearbox, axle shaft and mine shaft. www.gears-manufacturers.com /planetary-gears-exporters.html   (1072 words)

 Planetary Gear   (Site not responding. Last check: 2007-10-24) As an example, planetary gears convert shaft power from one angular frequency to another. Three planetary gears are used for mechanical reasons; they may be considered as one in describing the action of the gearing. In first gear, the front planetary gear is engaged, locking onto the input shaft. www.planetarygear.info   (386 words)

 Gear Motors, Planetary, Alternating Current (AC) - Worldwide Planetary gearing has the highest torque to weight ratio of any type. The gear units are robust, flexible in configuration and extremely simple to mount service or modify. Planetary gearboxes where low backlash (from 1arc/min) highest running accuracy and precision, high torque and compact unit is required. www.kellysearch.com /qz-product-44289.html   (1759 words)

 PLANETARY GEAR Hero Tandhjul PLANETARY GEAR   (Site not responding. Last check: 2007-10-24) These new milling machines were equipped with complicated gear mechanisms employing many gears. The gears themselves were not produced by Hero and were therefore purchased from various suppliers. Unfortunately, gears of the requisite quality were not available and to solve this problem Hero decided to commence its own gear production. www.herogears.com /planetary_gear.htm   (352 words)

 Tamiya - Planetary Gear Box Set Getting its name from the way the gears rotate like the planets around the sun, the Planetary Gear Box is a precise, highquality gearbox with a RE-260 motor built into the gear box itself to add to its compactness. A wide range of gear ratios can be attained, and two kinds of crank arms are supplied for a wider range of functions. Gear Ratios: 4:1 5:1 16:1 20:1 25:1 80:1 100:1 400:1 www.hobbytimeny.com /IBS/SimpleCat/product/ASP/product-id/756347.html   (104 words)

 Powerglide Planetary Gear Sets - TCI Automotive®   (Site not responding. Last check: 2007-10-24) All pinion gears, center gear, auxiliary gears and flange gear are replaced with 9310 Steel Billet gears. One of the common failure points with a Powerglide planetary is the ring gear. Most racers today are using 30-year-old ring gears that are pitted and cracked, which contributes to gear set lock-up and failure. www.tciauto.com /powerglide/powerglide_planetaries.htm   (491 words)

 Planetary Gear Motor- Hsiang Neng- Planetary Gearmotor Manufacturer Hsiang Neng manufactures planetary gear motors widely used in treadmills and actuators. Continuously efforts on the design and production of planetary gear motor, we have grown to become one of the influential gearmotor manufacturers in Taiwan and China. We commit to providing planetary gear motor in low noise, strong torque, long lifespan and high efficiency. www.b2b-electricmotors.com /planetarygear-motors.htm   (133 words)

 Reducers: Speed, Planetary Gear on ThomasNet.com A wide variety of manufacturers, distributors and service companies are featured in our extensive vertical directory to allow ease sourcing and research for Reducers: Speed, Planetary Gear. Planetary gears are made of plastic, sintered metal, & steel. Company Profile: A complete line of gear reducers, variable speed drives, gear motors, speed reducers & electric motors, as well as shaft couplings, metal bellow type & mechanical locking type. thomasnet.com /products/reducers-speed-planetary-gear-66710609-1.html   (769 words)

 Planetary Gear Box The planetary gear box system is a highly versatile system for reduction of high RPM electric motors to high-torque low RPM applications. This type of gear reduction system is often used in precision instruments because of the reliability and accuracy of the unit. By adding/removing gears in assembly, you can select ratios of 16:1, 20:1, 25:1, 80:1, 100:1 and 400:1. www.escience.ca /genSci/RENDER/8/1038/1086/10280.html   (71 words)

 LANTEC: Design & manufacturing Hydraulic hoists, winches, planetary gear drives Designing and customizing cost-effective, premium-quality winches, gear drives, and brakes, LANTEC is the professional problem solver for major heavy-industries all over the world. Planetary gear drives range in output torque from 5,000 lbf-ft to more than 543,000 lbf-ft. They are available as planetary or parallel shaft for hydraulic or electric applications. www.lantecgear.com   (222 words)

 Gear Heads, Planetary - Worldwide   (Site not responding. Last check: 2007-10-24) Our investment in research and development, commitment to distribution channels and unwavering dedication to our customers allows us to further develop and maintain a leadership position as the #1 supplier in a wide range of industries include packaging, robotics, automotive, semiconductor, machine tool, paper converting, cutting machinery, tire, medical, food processing and fiber optics. Davall Gears (ISO 9001) is a designer and manufacturer of gears, gearboxes and related power transmission components. In addition, precision and differential epicycle gears and gear box unit manufacturers. www.kellysearch.com /qz-product-44127.html   (1416 words)

 gearmotors, speed reducers, planetary gear unit Such units are designed to meet the provisions of European Directive 94/9/EC (ATEX 100a) and, in accordance with the classification criteria set out in the directive itself, are classified under categories 2G and 2D. ATEX-compliant gear units are available from the helical "C" series, the bevel helical series "A", shaft-mounted "F" and worm gears "VF" and "W" series. The motors of the BC series are the simple, proven and economical solution to the requirements of DC drives. www.tecnokit.net /gearmotors/gearmotors.htm   (449 words)

 Planetary Gearbox - Software, FreeWare, ShareWare, Download   (Site not responding. Last check: 2007-10-24) We carry best rated resources on Planetary Gearbox including Planetary Gearbox, Planetary Gearbox, Planetary Gearbox and Planetary Gearbox; Human Edited resources directory about PlanetaryGearbox is waiting you here. Spur gear sets, helical gear sets, spiral bevel gear sets, cut gears, transmissions, gardening tools, power, angle grinders, percussion drills, planetary gearbox. Mini Gears S.p.A. - Designs and manufactures custom spur, bevel and helical gears in cut steel and powder metal, complete transmission units, gearheads for bushcutters, gearboxes for forklift trucks, high precision planetary gearboxes. www.eshareware.net /search/Planetary%20Gearbox   (524 words)

 Planetary Gearset   (Site not responding. Last check: 2007-10-24) Please look for Planetary Gearset, Planetary Gear Systems and Automatic Transmission to find more Planetary Gearset information. A power transfer mechanism incorporating a planetary or epicyclic gearset which may be shifted manually between high and low range conditions for Two-speed full-time transfer case with integrated planetary gearset and synchronized range shift... www.planetarygearset.info   (355 words)

 Download YP Planetary Gear 1.0.1 - YP Planetary Gear is designed to assist teac   (Site not responding. Last check: 2007-10-24) A planetary gear train is a mechanism consisting of an assembly of meshed YP Gear has been designed for the study of gear trains. There is no crack, serial number, keygen for YP Planetary Gear 1.0.1 www.vadino.com /Free+Download+YP+Planetary+Gear   (947 words)

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