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Gear

 

A gear is a toothed wheel designed to transmit torque to another gear or toothed component. The teeth of a gear are often specially shaped in order to minimise wear and maximise the efficiency of power transmission.

Different-sized gears are often used in pairs, allowing the torque of the driving gear to produce a larger torque in the driven gear at lower speed, or a smaller torque at higher speed. The larger gear is known as a wheel and the smaller as a pinion. This is the principle of the automobile gearbox. As a gearbox is not an amplifier or a servo system, the amount of power delivered by the output gear or shaft will never exceed the power applied to the input gear, regardless of the gear ratio. There is actually a loss of power due to friction.

The most common type of gear wheel, spur gears, are flat and have teeth projecting radially and in the plane of the wheel. These gears can be fitted only to parallel axles. Bevelled gears have angled teeth, allowing torque to be transmitted between non-parallel but intersecting axles. If the axles are skewed, i.e. non-intersecting, then a worm gear can be used. This is a gear that resembles a screw, with parallel helical teeth, and mates with a normal spur gear. The worm gear can achieve a higher gear ratio than spur gears of a comparable size.

Torque can be converted to linear force by a rack and pinion. The pinion is a spur gear, and mates with a serrated bar that can be thought of as a spur gear with an infinitely large radius of curvature. Such a mechanism is used in automobiles to convert the rotation of the steering wheel into the left-to-right motion of the tie rod(s).



A crown gear

A crown gear is a special form of bevel gear which has teeth at right angles to the plane of the wheel, allowing it to drive axles at right angles to its own. A variation of this mechanism is used in the differential gear, a complex arrangement of gears that transmits power to two axles moving at variable speeds, such as those on a cornering automobile.

A contrate wheel has teeth at a right angle to the axis and meshes with a straight cut spur gear or pinion (used in clocks, some instrumentation, wind-up toys and Meccano).

Simple gears suffer from backlash, which is the error in motion that occurs when gears change direction. When moving forwards, the front face of the drive gear tooth pushes on the rear face of the driven gear. When the drive gear changes direction, its rear face is now pushing on the front face of the driven gear. There is slight 'slop' in any gearing where briefly neither face of the driving gear is pushing the driven gear. This means that input motion briefly causes no output motion. Assorted schemes exist to minimise or avoid problems this creates.

In some machines it is necessary to change the gear ratio to suit the task. There are several ways of doing this. For example:

The tooth form used for most applications is involute but there are other tooth forms such as cycloidal (used in mechanical clocks) or rack (used in automobile steering).

See also


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Ocean Sports Board Riders
Products for all types of boarding.
http://www.boardriders.co.uk/

Woody's Garage
Surf, skate, and snow boarding clothes and accessories.
http://www.woodysgarage.com

GetBoards
Offer skiboards, wakeboards, surfboards, kickboards, mountainboards, freeboards, skateboards, balanceboards, fingerboards and twin-tip skiis.
http://www.getboards.com/

Val Surf
Carrys a complete selection of boards, clothing and accessories. Multiple locations in Southern California.
http://www.valsurf.com

Ocean Culture Sandboards
Includes board descriptions, information on sandboarding in South Australia, photos, team riders, links, and contact details. Order sandboards and gear online.
http://www.oceanculture.com

Polr Shock Absorbers
Makes and sells shock absorbers for boardsports. Includes specifications, assembly instructions, dealer list, and online sales.
http://www.polrdesign.com

Fatwear
Clothing for the boarding enthusiast.
http://www.fatwear.com/

Decade Boardsports
Selection of snowboards, skateboards, parts, protective gear and clothing.
http://www.underworldsk8.com

Daddies Board Shop
Offer snowboards, boots, bindings, apparel, back country gear, skateboards, longboards, skateboard gear, backpacks, and videos.
http://www.daddiesboardshop.com

Perfect Conditions
Online sales of bags for wakeboards, snowboards, surfboards, and bodyboards and skatebags.
http://www.boardingproducts.com

Bunger Surf
Offers surfboards, skateboards, boogie boards, wetsuits, accessories and surfing videos.
http://www.bungersurf.com/Bunger_Surfcam/

Boards Online
Online snowboard, skateboard, and accessories shop based in the UK.
http://www.boardsonline.co.uk

Capitol Board Room
Snowboard, skateboard, and music shop, with bimonthly contests and articles. Clothing, equipment, and snow reports. Order online.
http://www.capitolboardroom.com/

SEIsports.com
Shop for snowboards, inline skates, wakeboards, bodyboards, skimboards, balance boards, skiboards, ice skates, towables, tubes, protective gear and videos.
http://www.seisports.com

Groove USA
Retails skiboards, snowboards, wakeboards and scooters, as well as helmets.
http://www.grooveusa.com/

Freebord
A unique board that allows you to simulate snowboarding on the street. Order online.
http://www.freebord.com

JC Sports
South Carolina pro shop for waterski, wakeboard, skateboard,and snowboard equipment. Online sales.
http://skijcsports.com

Bladeboard
Offers a two-wheeled skateboard. Prices and contact information.
http://members.aol.com/bladeboardusa/Bladeboard.html

SOB, California USA
Sells equipment bags, backpacks, and travel gear for snowboards, wakeboards, skateboards, and MX.
http://www.seegraves.com

Edge Sports
Offers motorized and push scooters, all terrain, motor and push skateboards, bike engines, go-ped equipment, and high performance billet aluminum parts and race accessories.
http://www.edgesports.net

Surf Video Network
Extreme sports videos.
http://www.surfvideo.net

Board Stiff
Sells skateboards, snowboards, accessories and clothing. Located in Media, Pennsylvania.
http://www.boardstiff.net

Cleanline Surf Co.
Offers wetsuits, surfboards, wakeboards, kiteboards, mountain boards, skateboards, and accessories. Online ordering.
http://www.cleanlinesurf.com

Guernsey's SurfShop
Surf, skate and windsurf equipment, clothing and accessories.
http://www.sailorsurf.co.uk/

Airwalk
Shoes and boots for skateboarders and snowboarders. [Need Shockwave to view.]
http://www.airwalk.com

ZJ Boarding House
Offers skateboarding, snowboarding, and surfing clothing and accessories including watches, footwear and tshirts.
http://www.zjboardinghouse.com

101 Board Sports
Features new and used surfboards, snowboards, wetsuits, bodyboards and rentals in North County, San Diego.
http://www.surfingnet.com

SkatenSnow.com
Features snowboarding and skateboarding goods.
http://www.skatensnow.com

Surf Paradise
Features brand names in snowboards, skateboards, wakeboards, clothing, and accessories.
http://www.surfparadise.com

Pacific Wave Boardshop
Santa Cruz surf, skate and snowboard shop.
http://www.pwave.com/

Zumiez
Carries gear, clothing and accessories for skateboarding and snowboarding.
http://www.zumiez.com

Perfect Wave Surf Shop
Snowboards and surfboard manufacturer. Order online.
http://www.perfectwave.com

Board Deals
Snow and skate boards and gear.
http://BoardDeals.com

gosurfgear
Offers surf boards, bodyboards, skimboards, and skateboards and boarding gear and accessories.
http://gosurfgear.com

The House
Sailboards, skateboards, wakeboards, snowboards and accessories.
http://www.the-house.com

Alternative To Xtreme
Extreme and action sports products including wakeboards, snowboards, surfboards, skateboards, BMX and biking, electric vehicles, gear and accessories.
http://www.a2xtreme.com

Vector Products
Sells ski, snowboard, and skateboard racks and Ford F-150 tie downs.
http://www.vectorproducts.com/

Wavejammer Surf Shop
Sales of surf, skate, and snow gear. Includes links and message board.
http://www.wavejammer.com/index.htm

Earthboards
Manufacturer and retailer. Offers all terrain boards, street boards, skateboards, wakeboards, accessories, and apparel. Order online. Includes photo gallery, message board, and places to ride.
http://www.earthboards.com/

X West Clothing Company
Sells sandboard gear and desert wear. Also offers custom imprinting.
http://www.xwest.com/

Telemarkdown.Com
Retails boots, bindings and outfitting packages.
http://www.telemarkdown.com/

RDC Shop
Sells skateboard, wakeboard, and snowboard gear and accessories.
http://www.rdcshop.com

Xtreme Surf and Sport
Offers extreme sport gear in one online shop for surf, skate, or snow.
http://www.xtremesurfandsport.com/cart/index.cfm

Zeal Optics
Manufacturer of sports-eyewear. Goggles and glasses for sports including mountainbiking, snowboarding, wakeboarding, surfing, and climbing. Prices, order form, and dealer locator.
http://zealoptics.com

Flipped
Offers snowboards, mountain boards, skateboards, street scooters, and accessories. Order online.
http://www.flipped24.co.uk/

Chuckiejones.com
Sells snowboard and skateboard gear, videos, and accessories.
http://www.chuckiejones.com/

Indo Balance Board
Offers cross training board for boardsports.
http://www.indoboard.com

Alki Bike and Board
Sells skateboards, mountainboards, snowboards, kick scooters and bikes. Includes photos and prices. Located in Seattle.
http://alkibikeandboard.com

Ozboards
Specializes in one of a kind, hand made skate boards and a wide range of custom made surf boards. Includes photos, prices, and order form.
http://www.ozboards.com

Kiwi In Motion
New Zealand retailer of kitesurf and kite ski equipment, jetboards, mountain bike motors, mini motorcycles, motoboards, and mountain boards.
http://www.kiwiinmotion.co.nz/

Big Deal Boardshop
Sells snowboard and skateboard equipment.
http://www.bigdeal.com

Hot Spot Worldwide
Sells skateboard and snowboard gear and accessories.
http://www.hotspotworldwide.com

C & C Rideshop
Selection of skateboards snowboards, accessories, and clothing.
http://www.candcrideshop.com/

Jays Boardshop
Sells skateboard completes, decks, trucks, bearings, wheels, hardware, clothing, snowboards, boots, bindings, protective gear, and accessories.
http://www.jaysboardshop.com

Planet TeeBone
Features skateboarding and surfing activewear. Also includes skateparks, surfing spots, and surfing legends and skaters.
http://www.planet-teebone.com

The Prime
Sells skateboard completes, decks, wheels, trucks, videos, and accessories and snowboards, boots, bindings, videos, and accessories. Also carries skateboarding and snowboarding clothing.
http://www.theprime.com

DemoSport
Sells snowboard, ski, and wakeboard gear and accessories. Price list and contact information. San Rafael, CA.
http://www.demosport.com/

Venomous Sandboards
Manufacturer of recreational and competition sandboards. Full line of sandboard gear including bindings, clothing, boardwax, and accessories.
http://www.venomousboards.com

Nirve
Offers snowboards, skateboards, surfboards, wakeboards, BMX bikes, Nirve apparel, and Voxom components. Order online or by phone. Also includes dealer locator.
http://www.nirve.com/

Board Sports Unlimited, Inc.
Offers a variety of boards including snow, wake, surf, skate, and mountain. Also sells accessories and apparel.
http://giftcollection.itcstore.com/



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