POWER TRANSMISSION STRUCTURE OF VEHICLE

PROBLEM TO BE SOLVED: To arrange a damper for absorbing the vibration of a power transmission system of a vehicle without causing interference with a peripheral vehicle-side member between a pair of universal joints on a drive shaft.SOLUTION: A drive shaft 10 comprises: a first universal joint 21 arranged at the other end of a first power transmission shaft 11 which is connected to a power source 2 at its one end; a second universal joint 22 arranged at the other end of a second power transmission shaft 12 which is connected to a drive wheel 28 at its one end; a third power transmission shaft 13 which extends toward the second universal joint 22 from the first universal joint 21; a fourth power transmission shaft 14 which extends toward the first universal joint 21 from the second universal joint 22; and a damper 30 which accommodates a shaft part 50 arranged at the other of the third and fourth power transmission shafts 13, 14 into a cylinder part 32 which is arranged at either of the third and fourth power transmission shafts 13, 14, and in which an elastic member 60 is interposed between the cylinder part 32 and the shaft part 50. A portion at the second universal joint 22 side rather than the elastic member 60 in the damper 30 is formed into a small-diameter part 36. 【課題】車両の動力伝達系の振動を吸収するためのダンパを、周辺の車体側部材に干渉することなく、ドライブシャフト上の一対の自在継手間に配置する。【解決手段】一端が動力源２に連結された第１動力伝達軸１１の他端に設けられた第１自在継手２１と、一端が駆動輪２８に連結された第２動力伝達軸１２の他端に設けられた第２自在継手２２と、第１自在継手２１から第２自在継手２２に向かって延びる第３動力伝達軸１３と、第２自在継手２２から第１自在継手２１に向かって延びる第４動力伝達軸１４と、第３、第４動力伝達軸１３，１４のいずれか一方に設けられた筒部３２内に第３、第４動力伝達軸１３，１４の他方に設けられた軸部５０を収容すると共に、該筒部３２と軸部５０との間に弾性部材６０を介在させてなるダンパ３０と、を備えたドライブシャフト１０において、ダンパ３０における弾性部材６０よりも第２自在継手２２側の部分を小径部３６とする。【選択図】図２