Travel drive device for dump truck

摘要

A wheel mounting cylinder (18) is rotatably provided on an outer peripheral side of an axle housing (12) through wheel support bearings (20, 21). A wet brake (45) is provided between the axle housing (12) and the wheel mounting cylinder (18) for applying a braking force to rotation of the wheel mounting cylinder (18). A seal mechanism (55) is provided between the wet brake (45) and the wheel support bearing (20) for keeping a cooling liquid (50) of the wet brake (45) in a sealed state to lubricant oil (100) in the wheel mounting cylinder (18). A foreign-object trapping portion (58, 62) is provided between the wheel support bearing (20) and the seal mechanism (55) for trapping foreign objects flowing from the seal mechanism (55) toward the wheel support bearing (20).

主权项

1. A travel drive device for a dump truck comprising:
a cylindrical axle housing mounted in a non-rotating state on a vehicle body of a dump truck; a rotational shaft provided to axially extend in said axle housing and driven and rotated by a drive source; a wheel mounting cylinder which is rotatably provided on an outer peripheral side of said axle housing through a plurality of wheel support bearings and to which wheels are mounted; a reduction gear mechanism provided between said axle housing and said wheel mounting cylinder to decelerate rotation of said rotational shaft, which is transmitted to said wheel mounting cylinder; a wet brake provided between said axle housing and said wheel mounting cylinder for applying a braking force to rotation of said wheel mounting cylinder; and a seal mechanism positioned between said wet brake and one of the plurality of said wheel support bearings and provided between said axle housing and said wheel mounting cylinder for keeping a cooling liquid of said wet brake in a sealed state to a lubricant oil in said wheel mounting cylinder, and a foreign-object trapping portion is-provided between said one wheel support bearing and said seal mechanism for trapping foreign objects flowing from said seal mechanism toward said one wheel support bearing, wherein said foreign-object trapping portion is configured as a radial gap formed of a gap providing a radial space between a brake hub forming part of the said wet brake and a retainer positioning an inner race of said one wheel support bearing to said axle housing.