The rear axle of the BMW Z4 Roadster, in turn, stands out through its compact configuration and precise wheel guidance, clear distribution of functions between the longitudinal arms connected to the body and the track control arms pivoting on
the rear axle subframe facilitating the set - up of the suspension.
The rigid connection between
the rear axle subframe and the body — without the use of elastic rubber elements — is borrowed from motorsport and serves to further improve wheel location and therefore directional stability.
M division has also dispensed with rear bushings, with the M2's
rear axle subframe bolted directly to the structure.
The racing - derived rigid connection between
the rear axle subframe and the body — dispensing with rubber bushings — improves wheel location and tracking stability.
In addition, a racing - derived rigid connection, dispensing with rubber bushings, is used to fix the lightweight steel grid - type
rear axle subframe to the body.
«Mounting for the rear differential within
the rear axle subframe, which is bolted to the body structure, has allowed us to achieve a new level of handling precision, but without neglecting comfort,» says Albert Biermann, BMW M division development boss, of the new cars.
«The double - elastic mounting for the rear differential within
the rear axle subframe — which is bolted to the body structure — has allowed us to achieve a new level of driving precision, but without neglecting comfort,» says Albert Biermann, citing another example of the perfect symbiosis of pure - bred motor sport technology and excellent everyday usability.
The rigid connection between
the rear axle subframe and the body — without the use of elastic rubber elements — is borrowed from motor sport and serves to further improve wheel location and therefore directional stability.
The potential inherent in the rear axle design — based on the race - derived principle of
the rear axle subframe being bolted to the body — and the even more precisely calculated elastokinematics for the front axle are exploited to the full in the models featuring the Competition Package, with the aim of enhancing driving precision.
The concept shown in Beijing shares its bones with the regular X3, but it features a specially developed
rear axle subframe and specific chassis integration.
Not exact matches
While the front
axle carrier and the crash box are made of carbon fiber, the
rear subframe complete with the engine and suspension mounts is aluminum.
Visible means to this end are the carbon - fiber upper front strut brace and the lower aluminum support structure; the
rear subframe that, together with the five - link suspension, bolts directly onto the steel floorpan; and the lightweight wheels,
axles, and composite driveshaft.
In May, the National Highway Traffic Safety Administration opened an investigation into the
rear axles, as well as the front
subframe.
Also new are the
subframes, which carry the multi-link
rear axle and double wishbone front suspension.
The
rear axle has a multi-link suspension with helper springs and chassis
subframe following the LSA concept (lightweight, stable, agile).
Available in Combi and passenger car versions, NV200 was built on a modified version of Nissan's B Platform, with fully independent strut type front suspension mounted on a separate
subframe and a leaf spring
rear axle.
The
rear subframe with the engine mount and
rear axle suspension points is made from aluminum — another lightweight material with which Lamborghini has a great deal of experience.
The
rear subframe with the engine mount and
rear axle suspension points is made from aluminum - another lightweight material with which Lamborghini has a great deal of experience.
The front
axle gets an aluminum
subframe, while the
rear axle is aluminum and steel.
A
rear axle with optimized
subframe features an aluminum and steel hybrid construction cell.
Rear: Multi-arm axle with rigidly mounted axle subframe; Sachs gas pressure dampers; double coil springs (main and ancillary spring); rear axle track arm adjustable for camber; rear axle tiebar reinforced and infinitely adjustable; adjustable sword - type anti-roll
Rear: Multi-arm
axle with rigidly mounted
axle subframe; Sachs gas pressure dampers; double coil springs (main and ancillary spring);
rear axle track arm adjustable for camber; rear axle tiebar reinforced and infinitely adjustable; adjustable sword - type anti-roll
rear axle track arm adjustable for camber;
rear axle tiebar reinforced and infinitely adjustable; adjustable sword - type anti-roll
rear axle tiebar reinforced and infinitely adjustable; adjustable sword - type anti-roll bar.
The backbone of the
rear axle is a
subframe with high flexural and torsional rigidity.
BMW also took a page from the motorsport realm by attaching the
rear axle directly to the
rear subframe without the use of rubber bushings or grommets.
The
rear -
axle subframe is made of high - strength steel.
The
rear axle drive unit is mounted to the
subframe by means of rubber isolators to block road and powertrain noise and vibration from the passenger compartment.
QUICK SPECS Vehicle / model: ’14 Jeep Cherokee Base price: $ 29,495 (Trailhawk) Engine (s): 2.4 - liter Tigershark I - 4, 3.2 - liter Pentastar V - 6 Rated hp / torque (lb - ft): 184/171 (2.4 - liter), 271/239 (3.2 - liter) Transmission: ZF 948TE 9 - spd Transfer case: N / A 4WD system (s): Full - time w / active on - demand clutch, selectable
rear locker w / Active Drive Lock Low - range ratio: 2.92:1 Frame type: Steel uniframe Suspension, f / r: McPherson strut, long - travel coil springs, one - piece aluminum
subframe, aluminum lower control arms, stabilizer bar / Four - link w / trailing arm, aluminum lateral links, isolated steel cradle, coil springs, stabilizer bar
Axles, f / r: 10.4 - in, two - spd PTU / 9.7 - in two - spd RDM w / selectable electronic locker
Axle ratio (s): 4.083:1 (2.4 - liter), 3.517:1 (3.2 - liter w / trailer tow) Max crawl ratio (s): 56:1 (2.4 - liter), 47.8:1 (3.2 - liter) Steering: Electric - power, rack - and - pinion Brakes, f / r: 13x1.1 - in vented disc, twin - piston floating caliper / 12.6 x0.47 - in solid disc, single - piston floating caliper disc Wheels (in): 17x7.5 Tires: P245 / 65R17 Firestone Destination A / T Wheelbase (in): 107 Length (in): 182 Height (in): 67.8 Base curb weight (lb): 4,106 Approach / departure angles (deg): 29.9 / 22.9 Minimum ground clearance (in): 8.7 Payload (lb): 1,000 Interior cargo volume (cu ft): 49.47 Max towing capacity (lb): 4,500 Fuel capacity (gal): 15.9 Fuel economy (mpg): TBD
The
rear axle likewise has more negative camber, optimised elastokinematics and a new
subframe mounting for greater stability at the physical limits.
Engine: 162 - horsepower, SOHC, fuel - injected four cylinder Transmission: four - speed automaticSuspension: front, MacPherson strut with coil springs, stabilizer bar and hydraulic shock absorbers;
rear, live
axle with trailing arms, wishbone
subframe, panhard rod, coil springs, stabilizer bar and gas shocks Brakes: four - wheel power disc with Bosch anti-lock Steering: power - assisted rack and pinion Weight: 3,067 pounds Length: 191.7 inches EPA rating: 18 mpg...
Suspension: front, MacPherson strut with coil springs, stabilizer bar and hydraulic shock absorbers;
rear, live
axle with trailing arms, wishbone
subframe, panhard rod, coil springs, stabilizer bar and gas shocks Brakes: four - wheel power disc with Bosch anti-lock Steering: power - assisted rack and pinion Weight: 3,067 pounds Length: 191.7 inches EPA rating: 18 mpg city / 22 highway Fuel tank capacity: 15.8 gallons Price range: $ 27,000 to $ 30,000
The
rear axle carrier is provided with more rigid bearings for increased driving stability; the
subframe is rigidly connected to the body.
The front and
rear axle, both of them mounted on
subframes, take the form of high - precision five - link constructions made extensively from lightweight aluminum.
Like the integral
rear axle, whose
subframes are bolted rigidly to the body, the double - wishbone front
axle boasts specific kinematics and newly developed components made from forged aluminium.
At the
rear, the
subframe supporting the suspension has larger bushings to better isolate it from the cabin and the larger shock absorbers are now mounted vertically behind the
axle line, improving body control motion.