With the Concept GLB at Auto Shanghai (18 to 25 April 2019), Mercedes-Benz shows what SUV ideas on the company’s compact car platform might also be realised alongside the GLA as a sporty all-rounder.
While the latter promises progressive driving enjoyment with its coupé-like lines, the Concept GLB places the emphasis on spaciousness and robustness. The concept car (length/width/height: 4634/1890/1900[1] millimetres) has space for up to seven occupants thanks to its long wheelbase (2829 millimetres). A number of sturdy features signal that the Concept GLB feels right at home on rough farm tracks.
The Mercedes-Benz Concept GLB has a distinctive presence in the world of compact SUVs with its muscular proportions. The clear, surface-accentuated contours with reduced lines and precise joints convey effortless superiority and modernity. The upright front section with its striking MULTIBEAM LED headlamps is clear evidence of off-road genes, as are the short overhangs at the front and rear. The long wheelbase and the functional greenhouse are the decisive factors providing generous spaciousness for up to seven occupants.
The muscular and sensuously contoured vehicle shoulder dominates the side view, an effect reinforced by the rising waistline. The contiguous doors improve ease of access and keep the door apertures free of soiling. All-round protective claddings divide the overall proportions and emphasise the vehicle’s off-road character.
The harmonious colour concept has exterior paintwork in designo cashmere white magno with high-gloss black mounted parts (e.g. the claddings or integrated roof box) as a contrast, plus discreet orange highlights in the radiator grille and as lettering on the outside mirror housings.
The chrome underguard at the front with integral air inlets in a stainless steel look emphasises the off-road qualities. The rear underguard echoes this theme, creating a balanced overall picture.
With a series of distinctive extra elements the concept vehicle exhibits a particularly robust character. At the front and rear, two shrouds emerge from the roof frame and accommodate LED spotlights acting as ambient lighting and orientation aids when driving off-road.
The black roof rails end in a curve at the front and rear. A roof box is mounted on the rear area. The rough-treaded off-road tyres are on robust 17-inch wheels in a bicolour design.
In design terms the interior of the Concept GLB reveals its membership of the new Mercedes-Benz compact car family, but as a showcar and SUV it has a special leather features and special trim elements. And for the first time in a compact model by Mercedes-Benz, a third seat row with two additional single seats that can be recessed flush into the load compartment floor to increase load capacity. These seats are far more than emergency seats, and offer comfortable seating for two medium-sized occupants.
The backrest of the middle seat row is 40:20:40 split-folding, and can be folded down to create a level load surface. The seat surfaces have a 40:60 division. The second seat row is fore-and-aft adjustable by 140 mm – by 90 mm to the front to increase luggage space or legroom for occupants right in the rear, and by 50 mm to the rear if particularly generous legroom is required in a five-seat configuration. Eight-stage seat backrest inclination adjustment in the second seat row also facilitates adaptation according to the current space or comfort requirements.
To facilitate access to the third seat row, the seats in the second row have an Easy-Entry function: when the unlocking lever on the top outer edge of the backrest is operated, the backrest folds forward and the entire seat can be pushed forward. A total of four child seats can be attached in the second and third seat rows.
The Concept GLB is powered by the M 260 four-cylinder petrol engine combined with an 8G-DCT dual clutch transmission, with a maximum output of 165 kW/224 hp and peak torque of 350 Nm. The engine block of diecast aluminium with cast iron cylinder liners has CONICSHAPE® technology, which is also known in-house as “trumpet-honing”. To further minimise piston friction and lower fuel consumption, the cylinder bore is widened at the lower end of the cylinder liners. The resulting, conical shape resembles the mouth of a trumpet.
An innovative low-friction oil and optimised piston rings also reduce friction losses. To take account of the higher specific output, the pistons themselves feature cooling ducts. This also ensures more efficient combustion. The balance shafts for smooth engine-running are located in the lower section of the crankcase. To enhance comfort even further, there is a centrifugal pendulum damper in the powertrain.
Also in the aluminium four-valve cylinder head is CAMTRONIC, a variable valve timing system that allows two-stage adjustment of the valve lift on the intake side of the valve assembly. In the partial-load range, this variable valve lift adjustment allows less air to be fed to the combustion chamber with a smaller valve lift, which leads to lower gas cycle losses. In higher load ranges the system switches to the higher valve lift to achieve the engine’s full power delivery.
The Concept GLB is equipped with the permanent all-wheel system 4MATIC, with fully-variable torque distribution. This sporty all-wheel drive configuration allows the driver to use the DYNAMIC SELECT switch to influence the characteristics of 4MATIC. Three characteristic maps are available to control the all-wheel drive clutch, though the system responds flexibly to the current driving situation in any mode. In regular driving operation, the drive programme “Eco/Comfort” is based on an 80:20 distribution (front axle:rear axle), while in “Sport” it is 70:30. In off-road mode the all-wheel drive clutch acts as an inter-axle differential lock, with the basic distribution a balanced 50:50.
4MATIC components include the power take-off to the rear axle, which is integrated into the automated dual clutch transmission, and the rear axle differential with an integrated multiplate clutch. This is electro-mechanically operated. Via a crown wheel and a ball ramp, an electric motor exerts an axial force on the clutch pack to open or close the plates. The rear axle differential compensates the different paths/rotational speeds of the rear wheels. The advantages of this control system are above all non-rpm-dependent operation across the entire actuation range, pilot control of the clutch while still stationary and higher efficiency thanks to the ball ramp concept.
