583 Twintube McPherson struts pressurized
The development of the pressurized McPherson strut has met with significant difficulties for many years. Direct transfer of the monotube principle, as used in the shock absorber, is not possible because of the high extension force. There are solutions that keep the rod small and transfer the wheel control to the cylinder tube, but these are expensive and involve high levels of damper friction see Section 6.4.6 in Ref. 5 . The pressurized twin-tube system is a good compromise. Here, the oil is...
13 H2
reference to drop base for tyre-fitting number of standard only in Germany can be dropped Fig. 2.22 Marking of the various safety shoulders when used only on the outside of the rim or on both the inside and outside. Normal means there is no safety contour Fig. 2.1 . Further details are contained in standard DIN 7817. Denomination Outside of rim Inside of rim Identification letters One-sided hump Hump Normal H Double hump Hump Hump H2 One-sided flat hump Flat hump Normal FH1 Double-sided flat...
37 Steer angle and steering ratio
References 1 and 9 deal with this area in detail. Section 4.7 covers steering kinematics. When the vehicle is moving very slowly and 'free of lateral forces', it will only corner precisely when the verticals drawn in the middle of all four wheels meet at one point - the centre of the bend M. If the rear wheels are not steered, the verticals on the two front wheels must intersect with the extension of the rear axle centre line at M Figs 3.89 and 1.69 whereby different steer angles Si and Sa,o...
25 Nonuniformity
The tyre consists of a number of individual parts, e.g. carcass layers, belt layers, running tread, sidewall stock and inner lining, which - put together on a tyre -10 -8 -6 -4 -2 0 2 4 6 8 10 Slip angle- Fig. 2.28 Tyre springing rate as a function of slip angle and road speed, measured on a radial tyre 185 70 R 13 86 S at p 2.1 bar. Speed increases the springing rate as the belt stands up due to the centrifugal force. However, the slip angle makes it softer because the belt is pushed away to...
Elastogram In Cellasto
Fig. 5.50 Supplementary spring manufactured by Elastogram in Cellasto polyurethane elastomer on the rear spring dampers of the VW Golf III, 1996 . Material properties and shape make the highly progressive springing curve possible. At 146 mm overall height, it can be compressed by 110 mm and accept an impact load of over 700 kg or a force of Fi 7 kN. Fig. 5.50 Supplementary spring manufactured by Elastogram in Cellasto polyurethane elastomer on the rear spring dampers of the VW Golf III, 1996 ....
221 Diagonal ply tyres
In industrialized countries, cross-ply tyres are no longer used on passenger cars, either as original tyres or as replacement tyres, unlike areas with very poor roads where the less vulnerable sidewall has certain advantages. The same is true of commercial vehicles and vehicles that tow trailers, and here too radial tyres have swept the board because of their many advantages. Nowadays, cross-ply tyres are used only for temporary use emergency spare tyres for passenger cars due to the low...
123 McPherson struts and strut dampers
The McPherson strut is a further development of double wishbone suspension. The upper transverse link is replaced by a pivot point on the wheel house panel, which takes the end of the piston rod and the coil spring. Forces from all directions are concentrated at this point and these cause bending stress in the piston rod. To avoid detrimental elastic camber and caster changes, the normal rod diameter of 11 mm in the shock absorber must be increased to at least 18 mm. With a piston diameter of...
141 Advantages and disadvantages of the frontmounted engine rearmounted drive
The standard design has a series of advantages on passenger cars and estate cars There is hardly any restriction on engine length, making it particularly suitable for more powerful vehicles in other words for engines with 8-12 cylinders . There is low load on the engine mounting, as only the maximum engine torque times the conversion of the lowest gear without differential transmission has to be absorbed. Insulation of engine noise is relatively easy. Under full load most of the vehicle mass is...