The present invention relates to heavy bulldozer which comprises connecting the right and left belt assemblages through laterally horizontal pivot shaft in such a manner that said belt assemblages can be independently moved up and down, providing upper half circular bearing on the rear lower surface of the body, sealing said bearing with the lower half circular bearing cap capable of connecting or disconnecting said bearing, providing the upper half circular bearing on the front lower surface of the body on the equalizer pin provided in the center of the equalizer bar for connecting the right and left truck frames, and sealing said bearing with removable lower half circular bearing cap wherein said heavy bulldozer can be disassembled into main body portion and the endless track portion, and can be freely transported by reducing the weight and the height thereof, providing bolt or cylinder to be screwed into the end of the above mentioned pivot shaft, on said end surface of the pivot shaft, so that the interval between the right and left belt assmblages can be changed by operating said bolt or cylinder, to easily separate the main body portion and the endless track portion, and at the same time the width of the right and left belt assemblages can be reduced to the effect that the heavy bulldozer can be easily transported.
A vehicle main frame having a longitudinal axis is subjected to relatively high loads in a pair of spaced essentially vertical planes disposed substantially parallel to the longitudinal axis and is supported by ground-engaging driving members through driving-member pivot bearings. The vehicle main frame includes a housing having an axis oriented transversely of the longitudinal axis of the frame and opposite ends. A pair of elongated sidewalls of the frame are disposed in laterally spaced substantially parallel relation which are individually rigidly secured in embracing relation to the opposite ends of the housing and have portions radially outwardly extended therefrom within the vertical planes for accommodating the high loads, the sidewalls being associated directly with the driving-member pivot bearings for substantially directly transmitting the high loads to the ground-engaging driving members in generally load-bypassing relation to the housing to minimize distortion of the housing.
The invention is directed to providing a frame structure of a crawler type construction machine vehicle facilitating a degree of freedom of reforming in accordance with a variation of vehicle kind. The frame structure is capable of setting a vehicle body gravitational center position to an optimum portion by use of an upper vehicle frame at an arbitrary position that is capable of strengthening total rigidity by an integrated structure. The frame structure has left and right track frames, and front and rear cross beams for coupling the left and right track frames in a shape of a lattice. A vehicle body frame is disposed between inner sides of the left and right track frames and coupled thereto in the shape of a lattice above the front and rear cross beams and the left and right track frames. The front and rear cross beams and the vehicle body frames are integrally constituted.
A crawler that includes a first crawler assembly and a second crawler assembly attached to the first crawler assembly so that the first crawler assembly is aligned with the direction of travel of the second crawler assembly.
