Provided is a lower traveling body (2) capable of effectively suppressing the entry of sand into a shaft support section of a rotating body. The lower traveling body (2) comprises a pair of supporting bodies (11) and a rotating body (20) which is rotatably supported by shaft supporting parts (8) of the supporting bodies (11). The shaft support section (8) includes a support shaft (30), a gap forming section (42), and an oil seal section (80). A gap (90) is formed between the gap-forming section (42) and the rotating body (20), and the gap (90) includes a sand entry suppression section (90a). The sand entry suppression section (90a) includes a gap entrance section (91) having an outer periphery expanded by a gap outer periphery expansion surface (24a), and a gap deep section (92) having a labyrinth shape. The end portion of the inner side of the gap inlet portion (91) forms a narrowing portion (93) providing the minimum gap size of the gap inlet portion (91).
提供一种能够有效地抑制砂土进入旋转体的轴支承部的下部行走体(2)。下部行走体(2)包括一对支撑体(11)、和可旋转地由支撑体(11)的轴支承部(8)支撑的旋转体(20)。轴支承部(8)包含支承轴(30)、间隙形成部(42)及油封部(80)。在间隙形成部(42)与旋转体(20)之间形成间隙(90),间隙(90)包含砂土进入抑制部90a。砂土进入抑制部(90a)包含具有由间隙外周扩大面(24a)扩大后的外周的间隙入口部(91)、和具有迷宫形状的间隙内深处部(92)。间隙入口部(91)的内侧的端部构成提供间隙入口部(91)的最小间隙尺寸的收窄部(93)。
Lower traveling body for construction machine
工程机械的下部行走体
09.08.2024
Patent
Elektronische Ressource
Chinesisch