| 摘要 |
PURPOSE:To damp vibration of a car body and reduce the generation of a noise, by integrally securing a battery to a subframe supporting an engine and increasing mechanical impedance of the subframe. CONSTITUTION:A subframe 3 is suspended to the bottom part of a car body frame 1 forming an engine compartment 2, and an engine E is mounted onto the subframe. The subframe 3 consists of lateral beams 31, 32 and a longitudinal beam 33, and a mounting bed 5 is secured onto the one lateral beam 31, while a battery 6 is mounted onto the mounting bed 5. If the engine E is operated, the direction of change in engine torque due to rotation of a crankshaft 4 of the engine is aligned to the direction of bending of a car body, and this causes vertical swivelling of the car body to be emphasized, then vibration of vertical bending is on the increasing trend in the front part of the car body, however, the battery 6 secured to the subframe 3 increases mechanical impedance of the subframe 3, and vibration of the subframe 3 is damped, then a vibrative noise of the car body is reduced. |
