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In rail technology attack angle means an angle generated between the direction of the wheel set and the direction of the wheel set traveling direction in a curved section or the like. γ in the figure on the right is the attack angle. If the attack angle is not 0, a force that pushes the wheel against the rail is generated, which may cause derailment. Also, due to the wheel skidding with respect to the rail, wear on the tread and rail of the wheel increases. Further, when the attack angle is large, the flange comes into contact with the side surface of the rail, which is one of the causes of squeaking noise and increases wear. An oiling device may be installed on the vehicle or track side for the purpose of reducing wear in curved sections caused by attack angles, etc. Various self-steer

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  • Attack angle (rail technology) (en)
  • アタック角 (ja)
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  • 鉄道車両におけるアタック角とは曲線区間などにおいて輪軸の向きと輪軸進行方向の向きの間に生じる角度をいう。車輪アタック角とも呼ばれる。右の図のγがアタック角である。アタック角が0でないことによって車輪をレールに押し付ける力(押圧)が生じ、脱線の原因となることがある。また、レールに対して車輪が横滑りをすることに起因して、車輪の踏面とレールの摩耗が増加する。さらに、アタック角が大きい場合、フランジがレール側面と接触することが軋み音の原因の一つとなり摩耗が増加する。アタック角などに起因する曲線区間における摩耗を軽減する目的で車両あるいは線路側に塗油装置を設置することがある。アタック角を減少させる目的で各種の自己操舵台車(ラジアル台車、操舵台車)が開発されている。(鉄道車両の台車#操舵台車・ラジアル台車(輪軸操舵機構つき台車)参照) (ja)
  • In rail technology attack angle means an angle generated between the direction of the wheel set and the direction of the wheel set traveling direction in a curved section or the like. γ in the figure on the right is the attack angle. If the attack angle is not 0, a force that pushes the wheel against the rail is generated, which may cause derailment. Also, due to the wheel skidding with respect to the rail, wear on the tread and rail of the wheel increases. Further, when the attack angle is large, the flange comes into contact with the side surface of the rail, which is one of the causes of squeaking noise and increases wear. An oiling device may be installed on the vehicle or track side for the purpose of reducing wear in curved sections caused by attack angles, etc. Various self-steer (en)
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  • http://commons.wikimedia.org/wiki/Special:FilePath/Rollingstock_wheelset_attack_angle_in_curb.png
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  • In rail technology attack angle means an angle generated between the direction of the wheel set and the direction of the wheel set traveling direction in a curved section or the like. γ in the figure on the right is the attack angle. If the attack angle is not 0, a force that pushes the wheel against the rail is generated, which may cause derailment. Also, due to the wheel skidding with respect to the rail, wear on the tread and rail of the wheel increases. Further, when the attack angle is large, the flange comes into contact with the side surface of the rail, which is one of the causes of squeaking noise and increases wear. An oiling device may be installed on the vehicle or track side for the purpose of reducing wear in curved sections caused by attack angles, etc. Various self-steering bogies have been developed for the purpose of reducing the attack angle. (en)
  • 鉄道車両におけるアタック角とは曲線区間などにおいて輪軸の向きと輪軸進行方向の向きの間に生じる角度をいう。車輪アタック角とも呼ばれる。右の図のγがアタック角である。アタック角が0でないことによって車輪をレールに押し付ける力(押圧)が生じ、脱線の原因となることがある。また、レールに対して車輪が横滑りをすることに起因して、車輪の踏面とレールの摩耗が増加する。さらに、アタック角が大きい場合、フランジがレール側面と接触することが軋み音の原因の一つとなり摩耗が増加する。アタック角などに起因する曲線区間における摩耗を軽減する目的で車両あるいは線路側に塗油装置を設置することがある。アタック角を減少させる目的で各種の自己操舵台車(ラジアル台車、操舵台車)が開発されている。(鉄道車両の台車#操舵台車・ラジアル台車(輪軸操舵機構つき台車)参照) (ja)
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