Download Vehicle Traction Mechanics by Raymond N. Yong PDF

By Raymond N. Yong

The basic challenge within the learn of car mobility is the improvement of traction among the motor vehicle and the aiding terrain. The mechanics of strength move will basically keep an eye on the ultimate functionality of the surficial desktop. opting for and predicting the potential of a specific piece of equipment to traverse effectively a selected piece of terrain is especially complicated, fairly because the features and houses of alternative different types of terrain disguise fluctuate significantly, as do the numerous different types of car and their operating apparatus. the fabric that kinds the foundation of this publication has been collected over decades of analysis either within the laboratory and within the box. It experiences car traction mechanics from the point of view of the interplay among the motor vehicle and the floor floor. the categories of machines lined comprise earth-moving, forestry, agricultural, and development machines. moreover, the mechanisms excited by the improvement of traction and the operating of the terrain via cultivation, building and floor disturbances are tested

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Tyre geometrical c h a r a c t e r i s t i c s (adapted from Meyer, 1977). the same t y r e l o a d i n g s , i n f l a t i o n pressures on the wide-base t y r e can be reduced. The wider c r o s s - s e c t i o n gives improved t r a c t i o n and f l o t a t i o n and the lower u n i t ground pressure can improve the r e s i s t a n c e t o damage from stones and other ob­ jects. (iii) Low s e c t i o n - h e i g h t t y r e s . The wide base p r i n c i p l e can be extended i n t o low s e c t i o n - h e i g h t t y r e s .

These t r a c t i v e forces should be generated w i t h o u t excessive s l i p or t e r r a i n surface damage, and should be i n e q u i l i b r i u m w i t h the torque produced a t the wheel hub or t r a c k d r i v i n g sprocket. The o b j e c t i v e s of t r a c t i v e elements, i n a d d i t i o n t o f l o t a t i o n and t r a c t i o n , are t o provide (a) b r a k i n g , (b) s t e e r i n g , (c) obstacle or slope climbing a b i l i t y , and (d) a mount t o absorb shocks. 2 FLOTATION AND TRACTION ELEMENTS D i f f e r e n t types of t r a c t i v e elements are used w i t h o f f - r o a d v e h i c l e s .

Excessive d e f l e c t ion (a) causes high motion r e s i s t a n c e , (b) overheats the t y r e and (c) accelerates t y r e surface wear. Hence the gain i n t r a c t i o n may be l o s t due t o an increase i n t y r e motion r e s i s t a n c e . I t should be noted t h a t a s i g n i f i c a n t decrease i n inflat- ion pressure may not r e s u l t i n excessive t y r e d e f l e c t i o n s when the t y r e i s opera t i n g on loose or s o f t s o i l s . 13 shows the e f f e c t of i n f l a t i o n pressure 58 F i g .

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