Working vehicle with semicrawlers

A working vehicle comprising:

• a body frame;
• front wheels;
• propelling drive shafts disposed in a rear portion of said body frame;
• and
• semicrawler units receiving drive from said propelling drive shafts, respectively, each said semicrawler units including:
• a drive rolling element attached to one of said propelling drive shafts;
• an endless crawler track driven by said drive rolling elements and contacting a ground;
• driven rolling elements engaged by said endless crawler track;
• and
• a track frame supporting said driven rolling elements, said track frame pivotally connected to a pivot shaft extending from said body frame, wherein said track frame remains at a fixed distance from said pivot shaft during operation of said working vehicle, wherein said track frame is supported by said body frame through a rectangular mounting frame fixed to said body frame, said pivot shaft provided to said mounting frame.

A working vehicle comprising:

• a body frame;
• front wheels;
• propelling drive shafts disposed in a rear portion of said body frame;
• semicrawler units receiving drive from said propelling drive shafts, respectively, each of said semicrawler units including a drive rolling element attached to one of said propelling drive shafts, an endless crawler track driven by said drive rolling element and contacting a ground, driven rolling elements engaged by said endless crawler track, a track frame supporting said driven rolling elements, said driven rolling elements distributed to a forward end and a rearward end of said track frame, said track frame pivotally connected to a pivot shaft extending from one of said track frame and said body frame, wherein said track frame and said driven rolling elements remain at a fixed distance from said pivot shaft during operation of said working vehicle;
• and
• rear wheels interchangeable with said semicrawler units for attachment to said propelling drive shafts.

A working vehicle comprising:

• a body frame;
• front wheels;
• propelling drive shafts disposed in a rear portion of said body frame;
• and
• semicrawler units receiving drive from said propelling drive shafts, respectively, each of said semicrawler units including:
• a drive rolling element attached to one of said propelling drive shafts;
• an endless crawler track driven by said drive rolling elements and contacting a ground;
• driven rolling elements engaged by said endless crawler track;
• a track frame supporting said driven rolling elements, said track frame pivotally connected to a pivot shaft extending from one of said track frame and said body frame, wherein said body frame remains at a fixed distance from said pivot shaft during operation of said working vehicle;
• and
• a stopper for limiting vertical oscillation of said track frame to a predetermined oscillating angle, wherein said stopper includes a first bracket attached to said track frame and defining a vertical guide and a second bracket attached to said body frame, said second bracket having a roller positioned in said vertical guide.

A working vehicle comprising:

• a body frame;
• front wheels;
• propelling drive shafts disposed in a rear portion of said body frame;
• and
• semicrawler units receiving drive from said propelling drive shafts, respectively, each of said semicrawler units including:
• a drive rolling element attached to one of said propelling drive shafts;
• an endless crawler track driven by said drive rolling elements and contacting a ground;
• driven rolling elements engaged by said endless crawler track;
• a track frame supporting said driven rolling elements, said track frame pivotally connected to a pivot shaft extending from one of said track frame and said body frame, wherein said body frame remains at a fixed distance from said pivot shaft during operation of said working vehicle;
• and
• a stopper for limiting vertical oscillation of said track frame to a predetermined oscillating angle, wherein said stopper includes:
• a first bracket attached to one of said body frame and said track frame, said bracket defining a vertical guide defining an upper limit and a lower limit;
• and
• a second bracket attached to the other of said body frame and said track frame, said second bracket having a horizontal member positioned in said vertical guide.

A working vehicle comprising:

• a body frame;
• front wheels;
• propelling drive shafts disposed in a rear portion of said body frame;
• and
• semicrawler units receiving drive from said propelling drive shafts, respectively, each of said semicrawler units including a drive rolling element attached to one of said propelling drive shafts, an endless crawler track driven by said drive rolling element and contacting a ground, driven rolling elements engaged by said endless crawler track, and a track frame supporting said driven rolling elements at a forward end and a rearward end thereof,
• said track frame being supported by said body frame to be pivotable through and about a pivot shaft wherein said pivot shaft is provided between said track frame and said body frame such that said pivot shaft cannot move linearly with respect to said track frame and said body frame.

A working vehicle comprising:

• a body frame;
• front wheels;
• propelling drive shafts disposed in a rear portion of said body frame;
• and
• semicrawler units receiving drive from said propelling drive shafts, respectively, each of said semicrawler units including a drive rolling element attached to one of said propelling drive shafts, an endless crawler track driven by said drive rolling element and contacting a ground, a driven rolling element engaged by said endless crawler track;
• and
• a track frame supporting said driven rolling elements at a forward end and a rearward end thereof, said track frame being supported by said body frame to be pivotable through and about a pivot shaft wherein said pivot shaft is provided between said track frame and said body frame such that said track frame cannot move linearly with respect to said pivot shaft and said body frame.

A working vehicle comprising:

• a body frame;
• front wheels;
• propelling drive shafts disposed in a rear portion of said body frame;
• and
• semicrawler units receiving drive from said propelling drive shafts, respectively, each of said semicrawler units including:
• a drive rolling element attached to one of said propelling drive shafts;
• an endless crawler track driven by said drive rolling element and contacting a ground;
• driven rolling elements engaged by said endless crawler track;
• and
• a track frame supporting said driven rolling elements, said track frame pivotally connected to a pivot shaft extending from one of said track frame and said body frame, wherein a distance between said pivot shaft and a center axis of said drive rolling element is less than a radius of said drive rolling element.