When cornering, an overturning moment is generated which makes the body roll outwards from the centre of turn. The immediate response is that the inner and outer swing arm rise and dip respectively at their pivoted ends so that the inner and outer wheels are compelled to tilt on their instantaneous tyre to ground centres, IWG1 and IWG2, in the opposite direction to the body roll.
For effective body roll to take place there must be two movements within the suspension geometry
1The swing arm pivot instantaneous centres IWB1 and IWB2 rotate about their instantaneous centres IWG1 and IWG2 in proportion to the amount of body roll.
2 The swing arm pivot instantaneous centres IWB1 and IWB2 move on a circular path which has a centre derived by the intersecting projection lines drawn through the tyre to ground instantaneous centres IWG1 and IWG2.
The tilting, and therefore rotation, of both swing arms about the tyre to ground instantaneous centres IWG1 and IWG2 will thus produce an arc which is tangential to the circle on which the swing arm pivot instantaneous centres IWB1 and IWB2 touch. Therefore, the intersecting point IBG, where the projection lines which are drawn through the wheel to ground contact points and the swing arm pivots meet, is the instantaneous centre of rotation for the body relative to the ground. This point is usually referred to as the body roll centre.
Thus the body roll centre may be found by drawing a straight line between the tyre contact centre and swing arm pivot centre of each half suspension and projecting these lines until they intersect some-where near the middle of the vehicle. The point of intersection becomes the body roll centre.
When cornering, an overturning moment is generated which makes the body roll outwards from the centre of turn. The immediate response is that the inner and outer swing arm rise and dip respectively at their pivoted ends so that the inner and outer wheels are compelled to tilt on their instantaneous tyre to ground centres, IWG1 and IWG2, in the opposite direction to the body roll. For effective body roll to take place there must be two movements within the suspension geometry 1The swing arm pivot instantaneous centres IWB1 and IWB2 rotate about their instantaneous centres IWG1 and IWG2 in proportion to the amount of body roll.2 The swing arm pivot instantaneous centres IWB1 and IWB2 move on a circular path which has a centre derived by the intersecting projection lines drawn through the tyre to ground instantaneous centres IWG1 and IWG2.The tilting, and therefore rotation, of both swing arms about the tyre to ground instantaneous centres IWG1 and IWG2 will thus produce an arc which is tangential to the circle on which the swing arm pivot instantaneous centres IWB1 and IWB2 touch. Therefore, the intersecting point IBG, where the projection lines which are drawn through the wheel to ground contact points and the swing arm pivots meet, is the instantaneous centre of rotation for the body relative to the ground. This point is usually referred to as the body roll centre.Thus the body roll centre may be found by drawing a straight line between the tyre contact centre and swing arm pivot centre of each half suspension and projecting these lines until they intersect some-where near the middle of the vehicle. The point of intersection becomes the body roll centre.
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