Patent ID: 8062160

Claim:
A travel assembly provided with a travel motor, a planetary speed reduction mechanism for transmitting rotation of said travel motor at a lower rotational speed, a spindle forming an axle, and a wheel supported on said spindle via a tapered roller bearing and rotatable by said planetary speed reduction mechanism, said planetary speed reduction mechanism comprising a sun gear rotatable by rotation of a shaft of said travel motor, planet gears for rotating said wheel in response to rotation of said sun gear, stepped pins forming rotary shafts for said planet gears, a carrier for holding said stepped pins thereon, and bolts for fixedly securing said stepped pins on said carrier, wherein: said travel assembly is provided with a spline connection connecting said spindle and said carrier with each other and a limiting member for limiting movements of said bolts in a direction toward said tapered roller bearing; said travel assembly is further provided with a retainer, which is in contact with an end face of said spindle and said carrier and presses said tapered roller bearing; and said limiting member comprises a flange portion having an outer diameter greater than a bore inner diameter of said tapered roller bearing and arranged on said retainer such that said flange portion is disposed between heads of said bolts and said tapered roller bearing.