PARALLEL CARDAN DRIVE SYSTEM RAILROAD VEHICULAR GEAR UNIT

• Main Authors: ASANO JUN, OTSUKA TOMOHIRO, HAYASHI SATOSHI, KAWABATA KAZUAKI
• Format: Patent
• Language: English; Japanese
• Published: 06.09.2018
• Subjects: BLASTING; ENGINEERING ELEMENTS AND UNITS; GEARING; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; LIGHTING; LOCOMOTIVES; MECHANICAL ENGINEERING; MOTOR RAILCARS; PERFORMING OPERATIONS; RAILWAYS; THERMAL INSULATION IN GENERAL; TRANSPORTING; WEAPONS

PROBLEM TO BE SOLVED: To provide a gear unit capable of reducing oscillation and noise produced when gear and pinion mesh by only two-dimensional tooth surface modification and with low cost in a parallel Cardan drive system railroad vehicular gear unit having a pair of helical pinion 1 and helical gear 2, each having gear specifications with modules of 4 to 8, pressure angle of 20 to 30°, and helix angle of 15 to 30°.SOLUTION: A railroad vehicular gear unit GM of the invention in that a tooth flank 11 in a tooth trunk direction of helical pinion 1 is expressed by a circular arc curve and that comprises: a circular arc curved crowning modification surface GMover 55% of the full width in a tooth width direction of the helical pinion; and a relieving modification surface GMof remaining part on both end sides in the tooth width direction. The modification amount R of the crowning modification surface is set within a range of equation (1).SELECTED DRAWING: Figure 2 【課題】モジュールが４〜８、圧力角が２０〜３０°及びねじれ角が１５〜３０°の歯車諸元を夫々有する、対をなすはすば小歯車１とはすば大歯車２とを備える平行カルダン駆動方式の鉄道車両用歯車装置において、二次元的な歯面修整だけで大歯車と小歯車とが噛み合うときに発生する振動と騒音とを低減できる低コストのものを提供する。【解決手段】本発明の鉄道車両用歯車装置ＧＭは、はすば小歯車１の歯筋方向の歯面１１が単一の円弧曲線で表される、はすば小歯車の歯幅方向全幅の５５％以上の範囲に亘る円弧曲線形状のクラウニング修整面ＧＷ１と、歯幅方向両端側の残存部分のレリービング修整面ＧＷ２とを有する。クラウニング修整面の修整量Ｒは式（１）の範囲内に設定される。【選択図】図２