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Unsprung mass information


In this simplified diagram the wheels, tires, and suspension are all part of the vehicle's unsprung weight, with only its one-piece chassis/body constituting its sprung weight

The unsprung mass (colloquially unsprung weight) of a vehicle is the mass of the suspension, wheels or tracks (as applicable), and other components directly connected to them. This contrasts with the sprung mass (or weight) supported by the suspension, which includes the body and other components within or attached to it. Components of the unsprung mass include the wheel axles, wheel bearings, wheel hubs, tires, and a portion of the weight of driveshafts, springs, shock absorbers, and suspension links. Brakes that are mounted inboard (i.e. as on the drive shaft, and not part of the wheel or its hub) are part of a vehicle's sprung mass.

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Unsprung mass

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The unsprung mass (colloquially unsprung weight) of a vehicle is the mass of the suspension, wheels or tracks (as applicable), and other components directly...

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Sprung mass

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sprung mass to unsprung mass ratio can also be deleterious to vehicle control.[citation needed] Unsprung mass "Sprung mass and Unsprung mass". ZigWheels...

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Wheel hub motor

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Protean Electric and Lotus found that most negative effects of added unsprung mass could be eliminated by adding suspension damping, and that the ability...

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Bicycle suspension

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suspension with their knees, making their mass be sprung mass, but all of the mass of the bicycles remains unsprung mass. At the other extreme are full suspension...

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Transaxle

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placement of the gearbox is unsuitable for a live axle (due to excessive unsprung mass), the rear suspension is either independent, or uses a de Dion tube...

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British Rail Class 91

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and drive bogie-mounted gearboxes via cardan shafts; this reduces the unsprung mass and hence track wear at high speeds. The locomotive also features an...

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Automobile handling

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springs, carried by the unsprung weight, carried by the tires, carried by the road. Unsprung weight is more properly regarded as a mass which has its own inherent...

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Ferrari F50

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4 piston aluminum Brembo calipers, Pagid brake pads, (without ABS) Unsprung mass: 99 lb/121 lb (front corners/rear corners) Rosso Corsa (red): 302 Giallo...

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Vehicle dynamics

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are purely due to mass and its distribution. These include: Center of mass Moment of inertia Roll moment Sprung mass Unsprung mass Weight distribution...

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Alloy wheel

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wheels for motorsports. Lighter wheels can improve handling by reducing unsprung mass, allowing suspension to follow the terrain more closely and thus improve...

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Bugatti Royale

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aluminium) was attached to the rear axle which meant it was part of the unsprung mass of the suspension. The clutch and gearbox were placed at odd locations...

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Hybrid vehicle drivetrain

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motors are integrated into the wheels. One disadvantage is that the unsprung mass increases and suspension responsiveness decreases, which impacts ride...

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Leaf spring

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as the flexible nature of the spring makes precise control of the unsprung mass of the axle difficult. Some suspension designs use a Watts link (or...

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Axial flux motor

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placing motors inside wheels, given that AFM's low mass does not excessively increase a vehicle's unsprung mass. YASA is targeting motors that deliver 220 kw...

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Double wishbone suspension

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the spring and damper inboard increases the total mass of the suspension, but reduces the unsprung mass, and also allows the designer to make the suspension...

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Fuchs wheel

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vehicle. They provided the rear-engined sports car with a reduction in unsprung mass, using a strong and lightweight alloy wheel. Despite still being in...

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Lexus GS

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has been redesigned, and overall curb weight is reduced. To reduce unsprung mass the new GS utilizes aluminum for all its suspension components. The...

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Claus Luthe

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suspension, semi-automatic transmission and inboard disc brakes to reduce unsprung mass. The Ro 80 still stands today as a milestone in automotive design. It...

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Acura MDX

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The MDX rides lower, which reduces its center of gravity. To reduce unsprung mass, the front suspension lower control arms are made from forged aluminum...

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Audi RS 4

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aluminium alloy disc hubs. The two-piece disc construction reduces unsprung mass and also reduces the transmission of heat generated by the brakes to...

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Protean Electric

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effect of the added unsprung mass by using slightly more suspension damping. What's more, they found that when that unsprung mass came from actual motors...

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Engine balance

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equalizers and how the value of an unbalanced moving mass compares to the unsprung mass and total mass of the locomotive. The way the tender is attached...

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Drive by wire

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Panhard rod Shock absorber Swing axle Toe angle Torsion bar Trailing arm Unsprung mass Watt's linkage Wheel alignment Wheelbase Steering Ackermann steering...

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International roughness index

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accelerometer to measure the relative motion of the sprung mass, corrected (sometimes) for the unsprung mass. Examples of these are the early ARAN systems (Canada)...

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