| 摘要 |
A sub-frame is provided to improve vibration isolation modulus of a front frame more than a rear frame in order to reduce the influence of vibration on the front frame. A sub-frame comprises: a right frame(120) and a left frame(110) on which a suspension is mounted; a front frame(130) and a rear frame(140) connected to the left frame and the right frame respectively; and mounting units(131,141) wherein a rubber bush is inserted by bolts. The rigidity of the front frame is weaker than the rear frame. The hardness of the rubber bush of the front frame is the same as that of the rear frame. The thickness of the rubber bush of the mounting unit in the front frame is thicker than that of the mounting unit in the rear frame. The rubber bushes are made of natural rubber.
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