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Extra resources for Cours de Mathématiques Supérieures

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While the mean gives a close approximation, a more suitable radius would be given by n _ Ί Δ Ϊ I j / vR max 7? 3 _ 3 Ώ ^min \ Γ~Ρ ΓI Blade angles employed are those at the effective radius, although some variation in exit angle across the blade is common, especially for the turbine. The angle of oil flow from a blade may not be exactly that of the blade, particularly if the blade angle is much removed from 90°. This is due to the stagger effect of the blades causing some loss of angular control of the oil (Fig.

Here, the torque converter is geared through a reduction box in the normal layshaft manner, 48 HANDBOOK OF A U T O M O T I V E DESGIN ANALYSIS and the direct drive from the lock-up clutch passes through the mainshaft. A one-way freewheel clutch is incorporated in the gearbox to prevent drive back into the torque converter in high gear. Automatic control requirements As was brought out in connexion with Fig. 33, the choice of appropriate points for gear shifting is critical for highest overall efficiency.

A B Filling clutch B C Accumulator build up C Clutch at full pressure Full line pressure Build up with initial spring load Build up with no initial spring load TimeFig. 38 Simple accumulator Smoothing Control This control usually takes the form of an accumulator arrangement — Fig. 38 shows the simplest form. The accumulator is charged slowly via the restriction; on selection of a ratio change, the oil charge is fed into the selected clutch-operating piston at a fairly high rate. Accumulator volume is such that the clutch will reach the engagement position but not apply much pressure, the pressure build-up rate being controlled by the recharge of the accumulator via the restriction.