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Steering wheel   by qilei

History

The first automobiles were steered with a tiller, but in 1894 Alfred Vacheron took part in the Paris-Rouen race with a Panhard 4hp model which he had fitted with a steering wheel.. That is believed to be one of the earliest employments of the principle.

From 1898 the Panhard et Levassor cars were equipped as standard with steering wheels. C S Rolls introduced the first car in Britain fitted with a steering wheel when he imported a 6 hp Panhard from France in 1898. Arthur Constantin Krebs replaced the tiller with an inclined steering wheel for the Panhard car he designed for the Paris-Amsterdam race which ran from the 7th to 13th of July 1898. In 1899 Packard used a steering wheel on the second car they built. Within a decade, the steering wheel had entirely replaced the tiller in automobiles.

Passenger cars

Non safety steering wheel in a Chrysler Airflow from the 1930s. The steering wheel is rigid and the steering column is non collapsible, thus increasing the risk of impaling the driver in case of crash

Steering wheels for passenger automobiles are generally circular, and are mounted to the steering column by a hub connected to the outer ring of the steering wheel by one or more spokes (single spoke wheels being a rather rare exception). Other types of vehicles may use the circular design, a butterfly shape, or some other shape. In countries where cars must drive on the left side of the road, the steering wheel is typically on the right side of the car (right-hand drive or RHD); the converse applies in countries where cars drive on the right side of the road (left-hand drive or LHD).

Besides its use in steering, the steering wheel is the usual location for a button to activate the car's horn. Additionally, many modern automobiles may have other controls, such as cruise control and audio system controls built into the steering wheel to minimize the extent to which the driver must take his hands off the wheel.

In 1968 in the United States regulations (FMVSS Standard No. 204) were edited concerning the acceptable rearward movement of the steering wheel in case of crash. Collapsible steering columns were required to meet that Standard.

Power steering gives the driver an easier means by which the steering of a car can be accomplished. Modern power steering have almost universally relied on a hydraulic system, although electrical systems are steadily replacing this technology. Mechanical power steering systems (ex. Studebaker, 1952) have been invented, but their weight and complexity negate the benefits that they provide.

While other methods of steering passenger cars have resulted from experiments, none have been deployed as successfully as the steering wheel.

Other designs

A modern Formula One car's steering wheel has buttons and knobs to control various functions as well as gauges and other important items normally found on a Dashboard.

The steering wheel is centrally located on certain high-performance sports cars, such as the McLaren F1, and in the majority of single-seat racing cars.

As a driver may have his hands on the steering wheel for hours at a time these are designed with ergonomics in mind. However, the most important concern is that the driver can effectively convey torque to the steering system; this is especially important in vehicles without power steering or in the rare event of a loss of steering assist. A typical design for circular steering wheels is a steel or magnesium rim with a plastic or rubberized grip molded over and around it. Some drivers purchase vinyl or textile steering wheel covers to enhance grip or comfort, or simply as decoration. Another device used to make steering easier is the brodie knob.

A similar device in aircraft is the yoke. Water vessels not steered from a stern-mounted tiller are directed with the ship's wheel, which may have inspired the concept of the steering wheel.

Adjustable steering wheels

Tilt Wheel

Developed by Edward James Lobdell, the seven position Tilt Wheel was made available in several General Motors products in 1963. Originally a luxury option on cars, the tilt function helps to adjust the steering wheel by moving the wheel through an arc in an up and down motion. Tilt Steering Wheels rely upon a ratchet joint located in the steering column just below the steering wheel. By disengaging the ratchet lock, the wheel can be adjusted upward or downward while the steering column remains stationary below the joint. Some designs place the pivot slightly forward along the column, allowing for a fair amount of vertical movement of the steering wheel with little actual tilt, while other designs place the pivot almost inside the steering wheel, allowing adjustment of the angle of the steering wheel with almost no change it its height.

Telescope Wheel

Developed by General Motors Saginaw Steering Gear Division, the telescoping wheel can be adjusted to an infinite number of positions in a 3-inch range. The Tilt and Telescope steering wheel was introduced as an exclusive option on Cadillac automobiles in 1965.

Adjustable Steering Column

In contrast, an adjustable steering column allows steering wheel height to be adjusted with only a small, useful change in tilt. Most of these systems work with compression locks or electric motors instead of ratchet mechanisms; the latter may be capable of moving to a memorized position when a given driver uses the car, or of moving up and forward for entry or exit.

Swing-away Steering Wheel

Introduced on the 1961 Ford Thunderbird, and made available on other Ford products throughout the 1960s, the Swing-away steering wheel allowed the steering wheel to move nine inches to the right when the transmission selector was in Park, so as to make driver exit and entry easier.

Usage

The steering wheel should be used with strategic movements of the hand and wrist in spinning motions. Caution and care should be used to ensure safety of the extremities. The constant motions used must be performed with caution. Remember to follow the "Handy rule" Which states "Proper posture of the hand-arm system while using hand tools is very important. As a rule the wrist should not be bent, but must be kept straight to avoid overexertion of such tissues as tendons and tendon sheaths and compression of nerves and blood vessels."1

The act of turning the steering wheel while the vehicle is stationary is called dry steering. It is generally advised to avoid dry steering as it puts strain on the steering mechanism and causes undue wear of the tires.

Buttons and controls on the steering wheel

The first button added to the steering wheel was a switch to activate the car's electric horn. Traditionally located on the steering wheel hub or center pad, the horn switch was sometimes placed on the spokes or activated via a decorative horn ring which obviated the necessity to move a hand away from the rim. A further development, the Rim Blow steering wheel, integrated the horn switch into the steering wheel rim itself.

When speed control systems were introduced in the 1960s, some automakers located the operating switches for this feature on the steering wheel. In the 1990s, a proliferation of new buttons began to appear on automobile steering wheels. Remote or alternate adjustments for the audio system, the telephone and voice control, acoustic repetition of the last navigation instruction, infotainment system, and on board computer functions can be operated comfortably and safely using buttons on the steering wheel. This ensures a high standard of additional safety since the driver is able in this way to control and operate many systems without even taking hands off the wheel or eyes off the road.

The scroll buttons can be used to set volume levels or page through menus.

Steering wheel audio control can use universal interfaces and adapters.

The buttons can be adjusted manually for reach and height.

Gaming imitations

Main article: Video game controller#Steering wheel

Certain game controllers available for arcade cabinets, personal computers and console games are designed to look and feel like a steering wheel and intended for use in racing games. The cheapest ones are just paddle controllers with a larger wheel, but most today's examples employ force feedback to simulate the tactile feedback a real driver feels from a steering wheel. This contributes to steering "feel" and is one of the hallmarks of a true "driver's car" or sports car.

See also

Wikimedia Commons has media related to: Steering wheels

Steering wheel (ship)

Dry steering

IR control

Remote control

Traffic directionality

Notes

^ "Reinvent The Wheel". infoChachkie. http://www.infochachkie.com/wheel/. Retrieved 2009-12-08. 

^ Source: the book "The World on Wheels - Volume I" by H.O.Duncan, printed in Paris 1927, page 456-457, picture of the Vacheron-Car at page 457)

^ http://www.scienceandsociety.co.uk/results.asp?image=10318524&wwwflag=2&imagepos=13

^ [dead link]

^ "Federal Motor Vehicle Safety Standards and Regulations". Nhtsa.dot.gov. http://www.nhtsa.dot.gov/cars/rules/import/FMVSS/#SN204. Retrieved 2009-12-08. 

^ "Universal steering wheel audio control interface". Tradekey.com. 2009-04-15. http://www.tradekey.com/selloffer_view/id/121556.htm. Retrieved 2009-12-08. 

^ "DIY for Steering Wheel Removal and Steering Wheel Audio Control Unit Install - Page 6 - MY350Z.COM Forums". My350z.com. http://my350z.com/forum/body-interior-exterior-and-lighting-diy/77855-diy-for-steering-wheel-removal-and-steering-wheel-audio-control-unit-install-6.html. Retrieved 2009-12-08. 

References

1 Kroemer, K. (2001). Ergonomics. Englewood Cliffs: Prentice Hall. ISBN 0137524781. 

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Categories: Auto parts | Control devices | 1899 introductions | Vehicle technologyHidden categories: All articles with dead external links | Articles with dead external links from December 2009 | Articles needing additional references from June 2008 | All articles needing additional references | All articles with unsourced statements | Articles with unsourced statements from June 2008

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