BMW 5 Series (E39) – Wikipedia, the free encyclopedia

14 Apr 2015 | Author: | Comments Off on BMW 5 Series (E39) – Wikipedia, the free encyclopedia
BMW 5-Series

BMW 5 Series (E39)

The BMW E39 is the BMW 5 Series made between 1995 and 2003. The E39 was the successor of the BMW E34 in 1995, and was replaced by the E60 in 2003. Sales to Germany and most of Western Europe began in 1995, and by 1996 sales to the rest of the world had commenced. A mid-generational refresh appeared in 2000, featuring minute detail changes.

At launch, the base model was the 520i, which developed 112#160;kilowatts (150#160;hp) in the pre-update models, and 126#160;kilowatts (170#160;hp) in later models. An M5 variant was introduced in 1998, with a 4.9-litre S62 V8 engine. All models but the M5 were available as either a saloon or an estate. the latter called Touring.

Contents

Engineering [ edit ]

Body [ edit ]

BMW 5-Series

The E39 all-steel body acts as a safety cage for occupant protection.

The structural rigidity of the monocoque was increased using computer-aided engineering. This allows key points to be reinforced, to increase rigidity, without significantly adding to the weight. The overall increase is 10#160;kilograms (22#160;lb), which is offset by the aluminium suspension.

Laser welding techniques ensure rigid bonding throughout. [ 5 ] Another area of focus in the design of the body was in structural dynamics. The body was designed so that the frequencies for torsional twisting and bending are in separate ranges and above natural frequency. These frequencies are out of the range of engine and driveline vibrations; thus they will not amplify them. [ 6 ]

The aerodynamically designed body and features of the E39 gave the 528i and 540i, 0.28 and 0.31 drag coefficients respectively. Torsional rigidity was also increased over the E34. by 40#160;percent. [ 6 ] The chassis was so stiff that the rigidity was unchanged for the E60 model. [ 7 ] [ not in citation given ] This added stiffness allows the suspension to work with more accuracy. It also allows total engineering of ride quality through the suspension; rather than in combination with body flex. [ 6 ]

Steering and suspension [ edit ]

With the E39, two steering types and double pivot, MacPherson strut suspensions systems are used. For the 520i–530i models, BMW, for the first time in a 5 series, utilised rack and pinion steering. [ 8 ] This not only offers weight reductions over the recirculating ball type used on the V8s, but also provides quicker steering response through its variable ratio, as well as a more precise feel. This system steers from the front of the axle. [ 6 ]

BMW 5-Series
BMW 5-Series
BMW 5-Series
BMW 5-Series
BMW 5-Series
BMW 5-Series
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