PEUGEOT 908RC SUSPENSION

Double Wishbone Suspension by Peugeot 908RC

The new model of 908RC.the ultimate by Peugeot is one of the best sell car now which are having comfortable driving. This Peugeot 908 RC is one of the model of Peugeot which are using drop link, double wishbone type suspension for front and rear suspension .The suspension was derived by the double wishbone from Peugeot 407.

The design of the 908 RC creates a particularly low-lying exterior body with a stylish tapered design at the front of the vehicle. Its proportions create an elegant and dynamic statement. Sitting on large diameter 20 spoke alloy wheels the overall effect is that of a big cat, from the nose at the front, to the tip of the rear light
In the great tradition of Peugeot concept cars, the 908 RC is a unique model conceived in the inner sanctum of the Peugeot Design Centre. The vehicle is built around a pre-impregnated carbon composite and vacuum-polymerized aluminum honeycomb structure. The rear section is a self-supporting shell incorporating a sub-frame consisting of a tubular structure on which the engine and suspension are assembled.

 Component Identification

The suspension strut is attached to the lower wishbone and gives the necessary vertical support. Low installed height and great with between the left and right side characterize this suspension design and make particularly advantages and sporty suspension possible. The double wishbone suspension takes up little room and appropriate tie road layout prevents severe load-reversal reactions.The trailing-link double wishbone suspension consists of a hollow-cast trailing link that also carries the wheel and upper and lower wishbone of particularly economical design. The spring is located on the trailing link a head of the wheel centre; the shock absorber is behind it. This compact layout occupied very little space and is used on lower mid side cars with four- wheel drive.

 System Operation

This firm, yet agile system hugs the road surface for a more exhilarating drive. Again, camber and toe changes have been designed to ensure that the tyres remain firmly planted on the ground during body roll or when driving over rough roads. The stroke has been used to its full capacity for more agile contact and each minor detail from the road surface is passed through to the suspension to ensure that the vehicle remains stable when turning. In addition, shocks received when driving over bumps are absorbed smoothly, while the use of large sub-frame bushes and the extended wheel stroke bring a completely new approach to overall ride comfort.

  Benefit of Double Wishbone

 The length of upper and lower arm, vertical suspension movement result in an increased in negative chamber- tire on outside of a turn stay in better contact with the road because negative chamber gain that occur as the body role help to make sure that the contact patch of the tire is a large as possible. Rigidity of the system prevent deflection during hard cornering which keep the steering and wheel alignment constant. Length of arm can be specifically design of the car.Those arm can be mounted various angle to the ground. 

Audi A8 Suspension

Adaptive air suspension of Audi A8

The Audi R8 model is using the latest technology system of suspension, adaptive air suspension which is very comfortable to driver. Adaptive air suspension is an electronically-controlled suspension system that acts on all four wheels of a vehicle. Adaptive air suspension adjusts the shock absorber, depending on the road conditions and the car’s speed, for precise handling and a high level of ride comfort. It also enables the speed-dependent lowering of the body, resulting in a lower center of gravity and improved vehicle aerodynamics and directional stability. This technology is available, for example, as an option in the Audi A8. An equipped vehicle has air suspension struts on all four wheels. The data from sensors on the axles and acceleration sensors on the body is evaluated in the adaptive air suspension's central control unit. This computer controls the adjustment of the individual shock absorbers in milliseconds depending on the driving situation. Controlled changes to the damping force at individual wheels help eliminate body movements at any time which could reduce occupant comfort. The adaptive damping system automatically reduces rolling or pitching movements when cornering, braking, or driving off. Adaptive air suspension, moreover, offers the advantages of a traditional self-leveling suspension system. The vehicle's suspension height remains constant irrespective of the load it is carrying. Audi adaptive air suspension successfully unites the apparently conflicting qualities of comfort and dynamic handling. With its combination of air suspension and a continuously variable, electronically controlled damper system, it adapts to every driving situation no matter how the vehicle is loaded.

   Component identification

All four wheels, the new A8 has air-suspension struts on which there are air-suspension bellows arranged concentrically around the continuously variable twin-tube shock absorbers. The air-suspension bellows consist of a special, multi-layered elastomeric material with polyamide cord inserts to increase strength. This layer absorbs the forces produced in the air spring.The suspension struts are pressurized by an electrically driven compressor in the engine compartment and a 5.8 liter pressure reservoir located at the rear of the vehicle with a maximum pressure of 16 bars. Plastic air lines connect the individual components; electromagnetic valves regulate the air flows.The data from four sensors on the axles and three acceleration sensors on the body is evaluated in the adaptive air suspension's central control unit. This computer prompts the adjustment of the individual shock absorbers in a matter of milliseconds, based on the driving situation identified, thereby always assuring optimum driving dynamics and ride comfort.Adaptive air suspension moreover offers the advantages of a traditional self-leveling suspension system. The vehicle's suspension height remains constant irrespective of the load it is carrying. This ensures that the Audi A8 is consistently presented to its best advantage.Air suspension also has a system-specific quality: the occupants additionally benefit from a constantly agreeable vibration behavior, again irrespective of the car's load. This is because extra air is pumped into the springs at high gross weights, and discharged again when the load is removed. The firmness of the springs thus adapts to the load situation at all times.

   System Operation

Adaptive air suspension is an electronically-controlled suspension system that acts on all four weeks of a vehicle. Adaptive air suspension adjusted the shock absorbers, depending on the road conditions and the car’s speed- dependent lowering of the body, resulting in a lower center of gravity and improved vehicle aerodynamics and directional stability. This technology is an available, for example, as an option in the Audi A8.An equipped vehicle has air suspension struts on all four wheels. The data from sensors on the axles and acceleration sensors on the body is evaluated in the adaptive air suspension’s central control unit. This computer controls the adjustment of the individual shock absorber in milliseconds depending on the driving situation. Controlled change the damping force at individual wheels help eliminate body movements at any time which could reduce occupant comfort. The adaptive damping system automatically reduces rolling or pitching movements when come ring, braking, or driving off. Adaptive air suspension, moreover, offers the advantage of a traditional self-leveling suspension system. The vehicle’s suspension height remains constant irrespective of the load it is carrying. To make loading easier .the Audi Q7 also offers a loading mode, which lowers the rear axle to 45mm below its level in normal mode. The loading mode can be activated either via MMI or by pressing a button in the luggage compartment.Audi adaptive air suspension successfully unites the apparently conflicting qualities of comfort and dynamic handling. With its combination of air suspension and a continuously variable, electronically controlled damper system, it adapts to every driving situation no matter how the vehicle is loaded

 

  Benefit of Adaptive Air Suspension

The vehicle's suspension height remaining constant irrespective of the load it is carrying; Adjustable dampening characteristics and ride height using a single process, via the manufacturers installed ‘Car Performance’ menu; And, generally, ability for the driver to influence the suspension characteristics, and thus the operating dynamics, as individually preferred. Very sporty and comfortable handling whatever the driving situation.

                                

REAR SUSPENSION - PEUGEOT 407

Multi-link arm suspension by Peugeot 407

The first time in Peugeot's history they have decided to opt for a double wishbone suspension unit on the 407's front axle. On the rear axle, the latest generation multi-arm suspension still features dampers that are, in Peugeot tradition, inclined rearwards to optimize boot space.  Based on a structure exhibiting a high tensional rigidity, the choice fell naturally therefore on two high-tech architectures with the generous use of lightweight materials on a dual wishbone front axle with drop link, and on an integral multi-arm rear suspension with inclined spring/damper assemblies. The various constituent parts of the suspension and their functional criteria were not compromised in any way. Compared to the first generation multi-arm rear suspension that made its appearance on the 406, the all-new rear suspension of the 407 differs essentially by the inclusion of inclined spring/valve damper assemblies (more compact) and of a longitudinal arm decoupled from the hub carrier to ensure longitudinal operation only (absence of extraneous forces generating vibrations). 

Launched in 2005, the Peugeot 407 Coupe is the latest in a long tradition of prestige coupes produced by Peugeot, where style plays a key role, combining stature and refinement to create a product capable of long-distance touring with comfort and high performance development.

This stature is expressed initially through the coupe’s suspension dynamics, with dual wishbone and a drop link at the front and multi-arm rear suspension: the Peugeot 407 coupe produces’ superb road holding, is acknowledged for its grip, progressive control, dynamics and ride comfort.

 Component identification

The multi-arm rear suspension is supported by an aluminum cross member. It consists of two cast-iron sections connected by a profiled tube, to which they are welded. The assembled cross member weighs 14 kg and is joined to the structure by means of four flexible mountings with inbuilt radial stiffness and axial flexibility. This extremely rigid cross member provides the interface with each suspension unit. Each one has an upper wishbone, two lower transverse arms, one longitudinal arm, a hub carrier, a spring and damper assembly and a solid anti-roll bar (Ø 19 and 19.8 mm) that connects the suspension units.The anti-roll bar is maintained by two bearings rigidly attached to the rear floor. It is connected to each hub carrier by means of a link with two ball joints and plays an important role in load transfers in transferring loads during cornering.

System operation

Derived from the double wishbone one, the multi-link suspension uses three or more lateral arms and one or one or more longitudinal arms, which don't have to be of equal length and can be angled away from their natural direction. Each of the arms has a spherical joint or rubber bushing at each end, causing them to “work” in tension and compression and not in bending. The arms are joined at the top and bottom of the spindle. When this spindle turns for steering, it actually alters suspension's geometry by torquing all suspension arms. Don't worry though, as the suspension's pivot systems are designed to allow this. Multi-link arrangements are used on both the front and the rear suspensions, but the former replaces a lateral arm with a tie-rod that connects the rack or steering box to the wheel hub.Since there isn't a single multi-link setup in the industry, all big names have their own design. Audi A4's front suspension also has four links and it's extremely similar to the double wishbone one. 

Benefit of the technology

 The multi link suspension is seen as the best independent system for a production car because it offers the best compromises between handling and space efficiency and comfort and handling. Moreover, because such a suspension allows a vehicle to flex more, it's also a very good solution for off road driving.   The multi link is also advantageous for the designer who can alter one parameter in the suspension without influencing the entire assembly. This is a major difference compared to a double wishbone suspension. As with all good things, the multi-link system is costly and complex to design and manufacture. In fact, the suspension's geometry needs to be checked with design analysis software.

PEUGEOT RCZ SUSPENSION

Macpherson Struts of Peugeot RCZ

Down below, the RCZ might be sitting on a platform derived from the 308, but the similarities are very few. It is wider by 30mm, has a significantly lower centre of gravity and wider front and rear tracks (44mm and 63mm wider).It is also has increased chassis rigidity and, at the wheel, it feels like a vault. Up front is a MacPherson strut suspension with a drop link anti-roll bar; rear suspension is semi-independent with a deformable cross member and anti-roll bar.The Peugeot RCZ benefit fundamentally from a highly efficient suspension set up developed from the marquee’s other platform 2 vehicle (Macpherson type front suspension and rear torsion beam). In addition, the car right height and center of gravity have been lowered by 20mm and 40 mm respectively compared to a 308 Hatchback. Furthermore compared to the latter,the Peugeot RCZ is wider front and rear track(+54mm and +72mm).the suspension and damper have been adapted accordingly and,with the addition of wider tyres(18" ou 19"),the end result is road holding of the very highest order.Lastly,when the Peugeot RCZ is equipped with the THP 147 kW(200 bhp) engine,front axel incorporates a special lower anti-roll bar make the car even more responsive and agile,while at the same time guaranteeing remarkable efficiency.

      Component Identification

The most unique feature of a MacPherson strut suspension is that all of the components are contained in a single assembly. Based on a triangle design, a typical MacPherson strut assembly includes a coil spring, upper suspension locator, and shock absorber and is mounted between the top arm of the steering knuckle and the inner fender panel. When the spring is not on the strut itself, but is instead located between the lower control arm and the frame, this is known as a Chapman strut and a modified MacPherson suspension.

The strut

Is the heart of the Macpherson suspension system. Not only do strut look like conventional shock absorber, they also perform same shock damping function. They reduce suspension space and weights are requirement as well, mounting the strut assembly to the strering knuckle, they need for an upper control arm and ball joint is eliminated. The upper mounted is the load carrying component of Macpherson suspension. 

Coil Spring

A mounting plate welded to the strut acts as the lower spring seat, while the upper seat is bolted to the strut piston rod. The coil spring and strut turn with the motion of the steering wheel by means of the bearing or rubber bushing in the upper mount. As mentioned earlier, modified Macpherson suspension do not have the coil spring mounted on the strut. While this feature does provide a smoother ride under normal driving condition, the regular Macpherson suspension (in which the spring is position on the strut) provides a smoother, more responsive ride over the wide range of driving condition. The higher and wider spring placement also provides superior resistance.

  System operation

Originally created for use on all four wheels, Macpherson struts are actually a front end suspension part that uses both a steering pivot system and a suspension mounting for the wheel. The strong upper mounting houses a spring and cartridge that provides shock absorption. The lower arm is the steering arm. This suspension assembly reduces the need for additional parts and is light-weight and cost effective.

 Benefit of MacPherson Strut:

 The Macpherson strut is the of the two suspension design and such a s, there are fewer things that can go wrong with the strut type suspension.Also Macpherson strut takes up a little less room horizontally which allow former room for the front drive axle to past through the front and its allow the for more passenger compartment space.  Relatively inexpensive compare another suspension type.  Design is reduce unsparing weight which not only reduce the total weight of car.