초록 ▼

A tractor having right and left traveling crawlers (9) installed thereon, comprising a hydraulic transmission swing mechanism (45), a forced-diff (41) for driving a crawler driving sprocket (4), and an engine (10), a hydraulic transmission straight-ahead driving mechanism (25), and a transmission ca

A tractor having right and left traveling crawlers (9) installed thereon, comprising a hydraulic transmission swing mechanism (45), a forced-diff (41) for driving a crawler driving sprocket (4), and an engine (10), a hydraulic transmission straight-ahead driving mechanism (25), and a transmission case (12) disposed from the front side to the rear side of a machine body in that order, wherein an allowance for heat radiation is provided to a space under a machine floor for storing the hydraulic transmission straight-ahead driving mechanism (25) to eliminate the problem of the machine floor becoming too high, and the forced-diff (41) is driven by the hydraulic transmission swing mechanism (45) with a simple structure.

대표청구항 ▼

1. A tractor comprising:an engine; a hydraulic transmission swing mechanism and a hydraulic transmission straight-ahead driving mechanism driven by said engine, said straight-ahead transmission having a transmission case; a forced-diff for combining output of said swing transmission and said straigh

1. A tractor comprising:an engine; a hydraulic transmission swing mechanism and a hydraulic transmission straight-ahead driving mechanism driven by said engine, said straight-ahead transmission having a transmission case; a forced-diff for combining output of said swing transmission and said straight-ahead transmission; right and left traveling crawlers driven by said forced-diff; a first connecting unit comprising said swing transmission and said forced-diff, wherein said first connecting unit is installed forward of said engine and longitudinally spaced from said engine by a first predetermined distance; a second connecting unit comprising said straight-ahead transmission and said transmission case, wherein said second connecting unit is installed rearward of said engine and longitudinally spaced from said engine by a second predetermined distance; and a machine floor installed between said engine and said second connection unit. 2. The tractor of claim 1, having right and left driving sprockets, wherein said first connection unit is disposed between said right and left sprockets.3. The tractor of claim 1 or 2, having a longitudinal centerline and a width, said tractor further comprising:a travel driving shaft for outputting straight-ahead driving force to said forced-diff, said shaft extending forward from said transmission case so that, in a plan view, said shaft slants away from said longitudinal centerline; and a first input position defined by a line between said swing transmission and said forced-diff, and a second input position defined by a line between said straight-ahead transmission and said forced-diff, wherein said first and second input positions are offset from each other with respect to said tractor width.