Roller wheel for track-type travelling vehicle

A roller wheel for a track-type travelling vehicle, the roller wheel disposed on a non-ground-engaging side of a track, the roller wheel supported by a vehicle body frame, the roller wheel comprising:

• a shaft supported by the vehicle body frame;
• a roller assembly disposed on an outer periphery of the shaft;
• and
• a bearing allowing the roller assembly to be rotatably supported by the shaft therethrough,
• wherein the roller assembly includes
• a tubular inner roller shell disposed closer to the vehicle body frame, and
• a tubular outer roller shell disposed outwards of the inner roller, the tubular outer roller shell being coupled to the inner roller shell by a straddle fitting structure,
• the straddle fitting structure includes
• an inner engaging portion formed on an outer periphery of an outer end of the inner roller shell,
• an outer engaging portion formed on an outer periphery of an inner end of the outer roller shell, and
• a coupling ring engaged astride with the inner and outer engaging portions for coupling the inner and outer roller shells,
• each of the inner and outer engaging portions of the inner and outer roller shells includes a protrusion extended radial outwards, and
• the coupling ring is an annular member including a pair of legs on an inner periphery thereof for allowing the pair of legs to be engaged with the protrusions of the inner and outer roller shells.

A roller wheel for a track-type travelling vehicle, the roller wheel disposed on a non-ground-engaging side of a track, the roller wheel supported by a vehicle body frame, the roller wheel comprising:

• a shaft supported by the vehicle body frame;
• a roller assembly disposed on an outer periphery of the shaft;
• and
• a bearing allowing the roller assembly to be rotatably supported by the shaft therethrough,
• wherein the roller assembly includes
• a tubular inner roller shell disposed closer to the vehicle body frame, and
• a tubular outer roller shell disposed outwards of the inner roller, the tubular outer roller shell being coupled to the inner roller shell by a straddle fitting structure,
• wherein the straddle fitting structure includes
• an inner interlocking portion formed on an outer end of the inner roller shell, and
• an outer interlocking portion formed on an inner end of the outer roller shell, and
• the straddle fitting structure couples the inner and outer roller shells, with one of the inner and outer interlocking portions of the inner and outer roller shells being interlocked astride with the other of the inner and outer interlocking portions of the inner and outer roller shells.

A roller wheel for a track-type travelling vehicle, the roller wheel disposed on a non-ground-engaging side of a track, the roller wheel supported by a vehicle body frame, the roller wheel comprising:

• a shaft supported by the vehicle body frame;
• a roller assembly disposed on an outer periphery of the shaft;
• and
• a bearing allowing the roller assembly to be rotatably supported by the shaft therethrough,
• wherein the roller assembly includes
• a tubular inner roller shell disposed closer to the vehicle body frame, and
• a tubular outer roller shell disposed outwards of the inner roller, the tubular outer roller shell being coupled to the inner roller shell by a straddle fitting structure,
• wherein one of the inner and outer interlocking portions of the inner and outer roller shells includes a male threaded portion on an outer peripheral surface thereof, and
• the other of the inner and outer interlocking portions of the inner and outer roller shells includes a female threaded portion allowing the male threaded portion to be screwed therein.