Attack angle (rail technology)

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.^[1] 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.^[2] 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.^[3] Various self-steering bogies have been developed for the purpose of reducing the attack angle.

References

^ "3．8．2 輪重横圧推定式の概要及び解析結果" (PDF). 国土交通省. Retrieved 2022-03-04.
^ Pressure may be caused with other reason from the attack angle.
^ "地下鉄における新たなレール塗油手法の検証" (PDF). 土木学会. Retrieved 2022-03-04.

"アタック角連続測定装置の開発と測定結果" (PDF). JR EAST. Retrieved 2022-03-04.
"アタック角が付与された車輪フランジとレール間における接触面と摺動方向についての一考察". 日本機械学会. Retrieved 2022-03-04.
"曲線でのきしみ音はいつ生じるのか？". 鉄道総研. Retrieved 2022-03-04.
"スムーズに曲がれる､進化する鉄道の台車｜経営". 東洋経済. 21 November 2018. Retrieved 2022-03-04.
"地下鉄の音について". 教えて！Goo. Retrieved 2022-03-04.

[1] "3．8．2 輪重横圧推定式の概要及び解析結果" (PDF). 国土交通省. Retrieved 2022-03-04.

[2] Pressure may be caused with other reason from the attack angle.

[3] "地下鉄における新たなレール塗油手法の検証" (PDF). 土木学会. Retrieved 2022-03-04.

[1]

[2]

[3]

See also

References