Abstract: A work machine includes a vehicle body, a lift frame rotatably supported around a lift axis with respect to the vehicle body, a blade rotatably supported around a pitch axis with respect to the lift frame, a lift actuator connected to the lift frame and the vehicle body, a pitch actuator connected to the blade and the lift frame, a sensor that detects a height of the blade from a reference height determined based on the vehicle body, and a controller that controls the pitch actuator to change a pitch angle of the blade according to the height of the blade. The lift actuator causes the lift frame to perform a lift motion up and down around the lift axis. The pitch actuator causes the blade to perform a pitching motion around the pitch axis.

Abstract: An HST circuit has a hydraulic pump that converts a drive force of an engine into energy of oil, and a hydraulic motor that converts the energy of the oil converted by the hydraulic pump into drive energy. Pressure sensors detect a pressure of the oil within the HST circuit. A variable charge pump replenishes the oil into the HST circuit. A controller controls a capacity of the variable charge pump based on the pressure of the oil within the HST circuit detected by the pressure sensors.

Abstract: An HST circuit has a hydraulic pump that converts a drive force of an engine into energy of oil, and a hydraulic motor that converts the energy of the oil converted by the hydraulic pump into drive energy. Pressure sensors detect a pressure of the oil within the HST circuit. A variable charge pump replenishes the oil into the HST circuit. A controller controls a capacity of the variable charge pump based on the pressure of the oil within the HST circuit detected by the pressure sensors.

Abstract: A hydrostatic transmission vehicle comprises: a fuel adjustment position detection portion (681) which detects an operation position of a fuel adjustment portion (68); a deceleration operation position detection portion (691) which detects an operation quantity of a deceleration operation portion (69); and a controller (9) which controls a displacement of a hydrostatic transmission (7), and the controller (9) comprises: an operation state judgment portion (91) which judges operation states of the fuel adjustment portion (68) and the deceleration operation portion (69) based on detection values acquired by the fuel adjustment position detection portion (681) and the deceleration operation position detection portion (691); and a displacement control command generation portion (94) which generates a displacement control command which differs depending on a case where an engine revolution number is restricted by the fuel adjustment portion (68) and a case where an engine revolution number is restricted by the dec

Abstract: A hydrostatic transmission vehicle comprises: a fuel adjustment position detection portion (681) which detects an operation position of a fuel adjustment portion (68); a deceleration operation position detection portion (691) which detects an operation quantity of a deceleration operation portion (69); and a controller (9) which controls a displacement of a hydrostatic transmission (7), and the controller (9) comprises: an operation state judgment portion (91) which judges operation states of the fuel adjustment portion (68) and the deceleration operation portion (69) based on detection values acquired by the fuel adjustment position detection portion (681) and the deceleration operation position detection portion (691); and a displacement control command generation portion (94) which generates a displacement control command which differs depending on a case where an engine revolution number is restricted by the fuel adjustment portion (68) and a case where an engine revolution number is restricted by the dec

Abstract: 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.

Abstract: A track frame structure which can increase a crawler actual ground contact length (L0) from a first track roller to an endmost track roller without increasing a whole length of a traveling apparatus. A notch portion (2a) having a size not contacting with an endmost track roller (6r) is formed in a portion facing to the track roller (6r) in a side of a crawler drive wheel (8) of a joint plate (2) provided so as to close one end portion in a longitudinal direction of a track frame (1), and the endmost track roller (6r) is arranged close to a side of the crawler drive wheel (8) so that the endmost track roller (6r) faces to an inner side of the notch portion (2a). A side portion of the notch portion (2a) in a joint plate (2A) is bent toward the crawler drive wheel (8).

Abstract: The invention provides a track frame structure which can increase a crawler actual ground contact length (L0) from a first track roller to an endmost track roller without increasing a whole length of a traveling apparatus. A notch portion (2a) having a size not contacting with an endmost track roller (6r) is formed in a portion facing to the track roller (6r) in a side of a crawler drive wheel (8) of a joint plate (2) provided so as to close one end portion in a longitudinal direction of a track frame (1), and the endmost track roller (6r) is arranged close to a side of the crawler drive wheel (8) so that the endmost track roller (6r) faces to an inner side of the notch portion (2a). A side portion of the notch portion (2a) in a joint plate (2A) is bent toward the crawler drive wheel (8).

Abstract: With an object of 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, capable of setting a vehicle body gravitational center position to an optimum portion by enabling to install an upper vehicle frame at an arbitrary position and capable of strengthening total rigidity by an integrated structure, there is provided a frame structure of a crawler type construction machine vehicle in a crawler travelling type having crawler reduction gears built with hydraulic motors at track frames of a crawler travelling apparatus, having 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 and a vehicle body frame disposed between inner sides of the left and right track frames and coupled in a 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