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The 1939 Motor Manual (UK, 30th edition), devoted three pages to dampers, perhaps indicating the increased recognition of their importance for normal vehicles. An illustration was included of the Andre–Hartford dry friction scissor, and also one of the Luvax vane damper, shown later. 15. That writer was moved to offer some additional explanation of damping and ‘shock absorbing’ in general, stating that: Whatever form of springing is employed, it is always considered necessary to damp the suspension by auxiliaries, which have become known as shock absorbers.
The gas is held in the elastomeric rolling seal bag. Nitrogen is used, reducing oxidation ageing of the rubber. The pressurised single-tube type may suffer from loss of pressure with failure of correct function in compression due to cavitation behind the piston. Suda et al. 29. Actuation of the EM damper rotates the ball screw nut which drives an electrical generator through a planetary gearbox. An alternative arrangement uses a rack and pinion for the mechanical drive. The obvious advantage of an EM damper is controllability—the damper force depends on the generator and its electrical load.
21 Sectional view of a front strut for a larger car. Piston diameter 36 mm, rod diameter 22 mm. 1 rod; 2 seal; 3 bush; 4 rolled closure; 5 bush; 6 top moulding; 7 bearing bush; 8 sleeve; 9 gas chamber; 11 centre moulding; 12 hole; 13 seal; 14 impact guard; 15 piston; 16 compression chamber; 17 inner (working) cylinder; 18 annular foot chamber; 19 wheel hub fixture; 20 foot valve (Boge). 22 Citroen air suspension. The valve, with two shim pack valves, is fixed in position. It is not in the piston, which ideally would pass no oil.