BPW Type Mechanical Suspension

Mechanical suspension is a kind of suspension with leaf spring , in stead of air bag , it’s traditional suspension , usually there single suspension , tandem suspension , and tridem suspension , and the quantity of spring is optional . BPW type mechanical suspension is a typical example of...

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Mechanical suspension is a kind of suspension with leaf spring , in stead of air bag , it’s traditional suspension , usually there single suspension , tandem suspension , and tridem suspension , and the quantity of spring is optional .


BPW type mechanical suspension is a typical example of German type mechanical suspension , which is popular in Europe ,Middle East ,  North Africa , West Africa , East Africa ,etc

TND mechanical suspension is the same class product as BPW type axle ,all the after-sales parts can be exchagned .



Suspension is the system of tires, tire air, springs, shock absorbers and linkages that connects a vehicle to its wheels and allows relative motion between the two.[1] Suspension systems must support both roadholding/handling and ride quality,[2] which are at odds with each other. The tuning of suspensions involves finding the right compromise. It is important for the suspension to keep the road wheel  in contact with the road surface as much as possible, because all the road or ground forces acting on the vehicle do so through the contact patches of the tires. The suspension also protects the vehicle itself and any cargo or luggage from damage and wear. The design of front and rear suspension of a car may be different.

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leaf spring is a simple form of spring commonly used for the suspension in wheeled vehicles. Originally called a laminated or carriage spring, and sometimes referred to as a semi-elliptical spring or cart spring, it is one of the oldest forms of springing,  appearing on carriages in England after 1750 and from there migrating to France and Germany. 


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Leaf springs front independent suspension, front-wheel-drive Alvis 1928

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Independent front suspension by transverse leaf spring Humber 1935

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Independent front suspension by semi-elliptical springs Mercedes  Benz 230 W153 1938

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Leaf spring on a German locomotive built by Orenstein-Koppel  and Lübecker Maschinenbau

A leaf spring takes the form of a slender arc-shaped length of spring steel of rectangular cross-section. In the most common configuration, the center of the arc provides location for the axle, while loops formed at either end provide  for attaching to the vehicle chassis. For very heavy vehicles, a leaf spring can be made from several leaves stacked on top of each other in several layers, often with progressively shorter leaves. Leaf springs can serve locating  and to some extent damping as well as springing functions. While the interleaf friction provides a damping action, it is not well controlled and results in stiction in the motion of the suspension. For this reason, some manufacturers have used mono-leaf springs.

A leaf spring can either be attached directly to the frame at both ends or attached directly at one end, usually the front, with the other end attached through a shackle, a short swinging arm. The shackle takes up  the tendency of the leaf spring to elongate when compressed and thus makes for softer springiness. Some springs terminated in a concave end, called a spoon end (seldom used now), to carry a swiveling member.

The leaf spring has seen a modern development in cars. The new Volvo XC90 (from 2016 year model and forward) has a transverse leaf spring in  high tech composite materials, a solution that is similar to the latest Chevrolet Corvette. This means a straight leaf spring, that is tightly secured to the chassis, and the ends of the spring bolted to the wheel suspension,  to allow the spring to work independently on each wheel. This means the suspension is smaller, flatter and lighter than a traditional setup.




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