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a trailing arm suspension
Introduction:
The trailing arm suspension EOB semi-independent suspension, the suspension from the large classification point of view, all the suspension can be divided into two categories, namely: independent suspension and non-independent suspension. However, but the torsion beam suspension trailing arm, these two classification becomes somewhat blurred. Suspended from the structural point of view belong to the letter of the non-independent suspension, because the rocker arm around the longitudinal direction is a torsion beam with coarse welded together, but suspended from the performance point of view, such a suspension is achieved with greater stability full towed independent suspension performance.
Advantages and disadvantages:
The trailing arm suspension itself has the disadvantage of non-independent suspension, but also combines the advantages of an independent suspension, the trailing arm suspension Maximum the advantage is a large space of about two, but no change in the camber angle of the vehicle body, bending stress does not occur shock, friction is small. Trailing arm suspension comfort and handling are limited, when it is in addition to the front brakes to be heavier outer sink, trailing arm rear suspension also balanced sinking body, we can not provide precise geometry control.
Main advantages: simple and practical structure, the smallest space, low manufacturing cost.
major disadvantages: poor performance bearing, weak anti-roll capacity, poor damping performance, comfort limited.
Applicable models: small and medium sized cars, the low-end SUV suspension.
Different manufacturers of such different suspension title: such as: twisted Liangdu Li trailing arm suspension, the trailing arm non-independent torsion beam suspension, H-type vertical suspension arm and so forth. They are ultimately the same suspension structure mdash; mdash; trailing arm type suspension, but slightly different tune.
suspension trailing arm type suspension structure is designed specifically for a rear wheel, it constitutes a very simple mdash; mdash; crude form vertically oscillating wheel trailing arms rigidly connected to the implement frame or the vehicle body, and hydraulic shock absorbers and coil springFlexible connection acts as a spring, and shock absorber functions as a support body, cylindrical or square cross member is connected to right and left wheels. From the trailing arm suspension structure, due to swing left and right vertical beams are connected, and therefore also suspension structure still maintains the overall characteristics of the bridge, which also makes the wheel longitudinal inclination of the trailing arm is not connected in the dynamic motion of foreign It will change, which will make the front appear understeer, so after trailing arm suspension can not provide good protection for the precise control of the body. Fortunately, however, the left and right trailing arm beams are connected to be rotatable at the connection type, allow a certain degree in the right and left wheels of small free space runout without disturbing the other side of the wheel.
Having said this, we need the help of actuation principle trailing arm suspension, take a look at why it is so mediocre performance. We have already said, the trailing arm is a suspension arm about a longitudinal beam connected to it in some characteristic to the overall similarities suspension bridge. Analogy, suppose a trailing arm rear suspension equipped compact car through a short road, the right and left rear wheel is connected to the cross member, so that the left and right wheels are simultaneously jitter with rough pavement, although the hydraulic shock absorbers and coil springs can absorb part of the shock, but the rear overhang integrity, remaining unable to filter out vibrations or inevitably passing cars, and therefore the occupant may feel some discomfort, this does not apply to put it bluntly point is a comparison of Britain . At this time, if the rear wheel is equipped with a multi-link suspension, with the left and right rear wheels may each respective connecting rod up and down movement, and will not interfere with each other in the middle of the cross member, so comfort is also greatly improved.
comfort that, in handling the more you do not expect the trailing arm will bring you great surprise. In particular, high-speed dynamic motion speed in the body with a certain inertia of the roll, since the wheel we mentioned longitudinal trailing arms are attached does not change in the camber angle of the steering, whereby the front wheels will cause understeer Therefore trailing arm suspension gives the impression that the state controlled manipulation of extreme poor, the rear wheels reflect the more slow. In fact, this is also the left and right trailing arms (wheel) is connected about the cross member, because the body will roll steering, but the curve inside wheels will try to keep in contact with the ground in the extended shock absorbers and springs, the left and right wheels uneven stress It will affect the dynamic handling. There are actually two options to solve this problem, one is to replace the more advanced multi-link suspension, the other is imported rear wheel steering servo function.
While the trailing arm and physical defects obvious shortcomings, but it is the focus of conflicting also the same outstanding advantages: the vehicle body occupies a small space, so that the body will not change in the camber movement, the shock absorber does not occur bending stress increased tire wear.
Structural Classification:
While the trailing arm type suspension structure is very simple, very few components, but it can be divided into semi-trailing arm, and the whole two types of trailing arm type.
The so-called semi-trailing arm type, is a suitable means or the trailing arm is parallel to the vehicle body is inclined, the front end of the trailing arm connected to the body or frame, a rear end connected to a wheel or an axle, the trailing arm with shock absorbers and coil springs can be achieve bobbing. Generally semi-trailing arm type suspension structure is relatively simple, low manufacturing cost, common in domestic mini-car or a compact car such as Otto, leased, Polo and Fit can be seen. While the full trailing arm type, refers to the trailing arm is mounted above the axle, a connecting arm extending from back to front, the wheel end commonly connected end to have a structure similar to the V-shaped trailing arm emerges from, we call such a structure full trailing arm type. This suspension structure is relatively more complex semi-trailing arm type, and good performance in the semi-trailer type, such methods usually cars Peugeot Citroen more common. After trailing arm type suspension Beverly is a typical all-trailing arm-type structure, but with the improved semi-trailing arm suspension structure, full drag arm has been very rare.
In fact, the trailing arm type suspension structure in many stress, such as a hydraulic damper and a combination of coil springs have integral and separate. Benefits integral damper and a spring in that space saving, increased comfort, the coil spring is generally small damping in such a configuration, stress ride comfort, the carrying capacity of such a structure is naturally very limited. The damper and the spring are separate spring-damper to compensate by increasing the integral bearing defects insufficient capacity, but this way has been affected comfort and shock absorbers and springs separately mounted and wasteful of space, this structure usually only MPV or minivan car more common.
A composition of a hydraulic damper and an outer coil spring stress in the trailing arm suspension design process, the right and left of the connection of the trailing arm beams are also very particular, because of the different positions of the mounting beam will resulting in vehicle performance has a very big change. If the beam mounting positionToo close to the point of attachment of the trailing arm and the vehicle body, the comfort of the vehicle will be very good, but the handling will fall, because it will cause body roll structure; if the mounting position of the beam too close to the central axis of the wheel position, vehicle ride comfort and handling are not how good, but by and carries better, because then its performance is close to the overall structure of the bridge.