| 摘要 |
A crawler drive unit for propelling a construction machine such as a shovel-type excavator having a pair of crawler track assemblies comprises a hydraulic motor (11) and a speed reducer (12), the latter including a stationary carrier (29) having carrier pins journaled therein, carrier gears (28) keyed to the carrier pins respectively, a first disk-type portion (40), and a second disktype portion (46) radially inwardly projecting from the first disk-type portion (40). An end face of the casing (13) of the hydraulic motor (11) is substantially coplanar with a surface of the stationary carrier (29) in which the annularly hollowed-out portion (47) is provided and another surface of the stationary carrier (29) which allows one end face of each carrier pin to abut thereagainst. With this arrangement, the stationary carrier (29) can be disposed in close proximity to the end portion (35) of the casing (13). This allows a compact arrangement requiring less dimension in the axial direction of the speed reducer (12) to be obtained. The casing (13) is allowed to have a thin wall, because it is free from excessive stresses which are commonly caused by the load set up in the sprocket wheel when a prior art unit is started.
|
