To prevent lubricant L supplied to a first bearing 9a from flowing back in a return hole 15, in a gear unit 1 for a railway vehicle in which a first bearing lid 10a having a first bearing mounting part 10a1 in which for a direction from a small gear 4 toward a drive source as one axis direction and an opposite direction as the other axis direction, a first bearing 9a for supporting a gear shaft 41 is internally fitted to a first side wall 31 of a gear box 4 on the one axis direction side, and a first lid body 10a2 surrounding the gear shaft 41 projecting from the first bearing mounting part 10a1 toward the one axis direction, is mounted; oil throwing members 13a, 13b constituting a labyrinth seal in the first lid body 102 are externally fitted to the gear shaft 41; and the return hole 15 having a return hole 15a is formed at the lower part of the first bearing mounting part 101.SOLUTION: A backflow prevention plate 16 is externally fitted onto a gear shaft 41 between a small gear 4 and a first bearing 9a, and an outer diameter l1 of the backflow prevention plate 16 is longer than a distance l2 from an axial core 41c of the gear shaft 41 to a lower end of a return port 15a.SELECTED DRAWING: Figure 2

    【課題】小歯車4から駆動源に向かう方向を軸方向一方、その反対側を軸方向他方として、軸方向一方側の歯車箱4の第1側壁31に、歯車軸41を軸支する第1軸受9aが内嵌される第1軸受取付部10a1と、第1軸受取付部10a1から軸方向一方に突出する歯車軸41を囲う第1蓋本体10a2とを有する第1軸受蓋10aが装着され、第1蓋本体10a2内にラビリンスシールを構成する油切り部材13a,13bが歯車軸41に外嵌し、第1軸受取付部10a1の下部に、戻し口15aを有する戻し孔14が形成される鉄道車両用歯車装置1において、第1軸受9aに供給される潤滑油Lが戻し孔15を逆流するのを抑制する。【解決手段】逆流防止板16が、小歯車4と第1軸受9aの間で歯車軸41に外嵌され、逆流防止板16の外径l1が、歯車軸14の軸心14cから戻し口15aの下端までの距離l2よりも長い。【選択図】図2


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    Title :

    GEAR UNIT FOR RAILWAY VEHICLE


    Additional title:

    鉄道車両用歯車装置


    Contributors:

    Publication date :

    2022-06-03


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    F16H Getriebe , GEARING / B61C Lokomotiven , LOCOMOTIVES / F16C SHAFTS , Wellen



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