| 摘要 |
PURPOSE: A lower arm of a vehicle for regulating caster angle is provided to keep straight traveling stability of the vehicle optimal and to hold optimal steering feeling for a driver by adjusting the caster angle by operating a vehicle body mounting bush. CONSTITUTION: Two ends of a lower arm(2) are combined with a vehicle body mounting bush(10) and a geometry bush(20) and joined with flanges(1a,1b) disposed at a sub frame(1) and the other end is united with a ball joint(30) and combined with a knuckle of a vehicle wheel. The vehicle body mounting bush is composed of outer and inner pipes(11,13) and a bush rubber(15) combined between the outer and inner pipes to absorb shock and inserted into the flange of the sub frame without interference between the flange and the mounting bush. An inner pipe nut(50) is inserted in the inner pipe and contact surfaces of the inner pipe and the inner pipe nut are combined to each other in a female-male type. A bush bolt(60) for joining the flange of the sub frame and the vehicle body mounting bush passes through the inner pipe nut and the bush bolt is integrated with the inner pipe nut. A bolt rotation preventing unit(70) is detachably combined to the bush bolt to constrain the rotation of the bolt.
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