automotive suspension

automotive suspension

[¦ȯd·ə¦mōd·iv səs′pen·chən]
(mechanical engineering)
The springs and related parts intermediate between the wheels and frame of an automotive vehicle that support the frame on the wheels and absorb road shock caused by passage of the wheels over irregularities.

Automotive suspension

The springs and related parts intermediate between the wheels and the frame, subframe, or side rails of a unitized body. The suspension supports the weight of the upper part of a vehicle on its axles and wheels, allows the vehicle to travel over irregular surfaces with a minimum of up-and-down body movement, and allows the vehicle to corner with minimum roll or loss of traction between the tires and the road. See Automobile, Spring (machines)

In a typical suspension system for a vehicle with front-engine and front-wheel drive (see illustration), the weight of the vehicle applies an initial compression to the coil springs. When the tires and wheels encounter irregularities in the road, the springs further compress or expand to absorb most of the shock. The suspension at the rear wheels is usually simpler than for the front wheels, which require multiple-point attachments so the wheels can move up and down while swinging from side to side for steering.

Front-wheel-drive car with MacPherson-strut front suspension and strut-type independent rear suspensionenlarge picture
Front-wheel-drive car with MacPherson-strut front suspension and strut-type independent rear suspension

A telescoping hydraulic damper, known as a shock absorber, is mounted separately or in the strut at each wheel to restrain spring movement and prevent prolonged spring oscillations. The shock absorber contains a piston that moves in a cylinder as the wheel moves up and down with respect to the vehicle body or frame. As the piston moves, it forces a fluid through an orifice, imposing a restraint on the spring. Spring-loaded valves open to permit quicker flow of the fluid if fluid pressure rises high enough, as it may when rapid wheel movements take place. Most automotive vehicles use gas-filled shock absorbers in which the air space above the fluid is filled with a pressurized gas such as nitrogen. The gas pressure on the fluid reduces the creation of air bubbles and foaming.

Most automotive vehicles have independent front suspension, usually using coil springs as part of either a short-arm long-arm or a MacPherson-strut suspension system. A MacPherson-strut suspension (see illustration) combines a coil spring and shock absorber into a strut assembly that requires only a beam-type lower control arm.

Some vehicles with short-arm long-arm front suspension use either longitudinal or transverse torsion bars for the front springs. One end of the torsion bar is attached to the lower control arm, and the other end is anchored to the vehicle body or frame. As the tire and wheel move up and down, the torsion bar provides springing action by twisting about its long axis. Turning an adjustment bolt at one end of the torsion bar raises or lowers the vehicle ride height.

Most automobiles and many light trucks have coil springs at the rear. These may mount on the rear drive axle, on struts, or on various types of control or suspension arms in an independent suspension system. Some rear-drive vehicles have leaf springs at the rear. Others use transverse torsion bars.

References in periodicals archive ?
The necessity for improving the Automotive Traction Bar reliability and performance has become one of the main areas of concentration for the automotive suspension manufacturers.
M2 PRESSWIRE-August 26, 2019-: Automotive Suspension System Market by Manufacturers,Types,Regions and Applications Research Report Forecast to 2023
The goal of this work was to develop a fracture surface for a ferrous casting commonly used in the knuckle of an automotive suspension system.
The market share of automotive suspension technologies is expected to increase.
He said the vehicle was built to demonstrate that continuous-fiber-reinforced thermoplastic resin is an excellent material for automotive suspension and structural components.
"An Innovative Magnetorheological Damper for Automotive Suspension: From Design to Experimental Characterization", Smart Materials and Structures, 14: 811-822.
is a wholly owned subsidiary of Japanese auto parts maker Yanagawa Seiki Co., Tokyo, and is a Honda Tier I supplier that manufactures automotive suspension, engine and wheel components.
This will focus on securing additional contracts to manufacture automotive suspension and brake components.
Cherry and Jones used a fuzzy logic controller to control a 47-degreeof-freedom (DOF) multibody automotive suspension [8].
(Sistemi), engaged in the business of design, manufacturing and sale of automotive suspension modules and components, will set up a 50:50 Joint-Venture (JV) with Talbros Automotive Components Ltd.
JAI also plans to expand its product portfolio by introducing other automotive suspension products, for which it has entered into technical collaboration with Ridewell Corporation, USA.
While Kobe Aluminum Automotive Products LLC, recently invested $80 million in its Bowling Green, Ky., plant to produce forged aluminum automotive suspension components, executives there still found that the computer numerical control software that the company originally used was hard to learn and produced programs that took too long to run.

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