Abstract: A hydraulic fluid tank includes a tank main member of a box-shaped member with a return port and a drawing port that are opened therein; and a divider member that is located in an interior of the tank main member and defines a path of fluid flow from the return port to the drawing port. In addition, the divider member is formed so that the fluid flow makes at least one turn in a vertical direction and at least one turn in a width direction.

Abstract: In construction machinery, control is conducted to keep a work machine to operate at a constant speed regardless of the operation thereof. Different engine output lines T0-T3 and pump torque lines M1-M4 are defined for different operation types. All the matching points of the engine output lines T0-T3 and pump torque lines M1-M4 designate a constant engine speed N1. One engine output line and one pump torque line are selected according to the operation type presently selected. An output horsepower of the engine is controlled on an equal horsepower line corresponding to a sum of a horsepower for an auxiliary machine and a horsepower at a matching point of the selected lines. The pump torque for the work machine is controlled on the selected pump torque line. The engine operates at a constant speed N1 even when the operation type varies or the horsepower for the auxiliary machine changes.

Abstract: A hydraulic fluid tank includes a tank main member of a box-shaped member with a return port and a drawing port that are opened therein; and a divider member that is located in an interior of the tank main member and defines a path of fluid flow from the return port to the drawing port. In addition, the divider member is formed so that the fluid flow makes at least one turn in a vertical direction and at least one turn in a width direction.

Abstract: In construction machinery, control is conducted to keep a work machine to operate at a constant speed regardless of the operation thereof. Different engine output lines T0-T3 and pump torque lines M1-M4 are defined for different operation types. All the matching points of the engine output lines T0-T3 and pump torque lines M1-M4 designate a constant engine speed N1. One engine output line and one pump torque line are selected according to the operation type presently selected. An output horsepower of the engine is controlled on an equal horsepower line corresponding to a sum of a horsepower for an auxiliary machine and a horsepower at a matching point of the selected lines. The pump torque for the work machine is controlled on the selected pump torque line. The engine operates at a constant speed N1 even when the operation type varies or the horsepower for the auxiliary machine changes.

Abstract: Hybrid construction equipment leveling an engine load and effectively performing regeneration of energy is provided. For this purpose, the construction equipment includes a hydraulic pump (2) and a first electric motor (7) driven by an engine (1), a battery (9) for charging electric power generated by the first electric motor, a second electric motor (10) driven by electric power of the battery and functioning as a generator at a time of braking revolution, a swash plate angel sensor 33 and a pressure sensor 34 for the hydraulic pump, and a controller (5) for controlling the first electric motor as a generator by surplus torque when absorption torque is smaller than predetermined output torque of the engine and controlling the first electric motor as a motor to generate an amount of shortage of torque when the absorption torque is larger than the predetermined torque.

Abstract: A hybrid construction equipment capable of sufficiently exhibiting performance of a battery with strategic arrangement of the apparatuses being carried out is provided. For this purpose, the hybrid construction equipment includes, on an upper revolving superstructure (10) rotatably placed on a lower traveling unit, an engine (1), a generator (3) driven by the engine (1), a battery (5) charged with electric power generated by the generator (3), an electric motor (7) driven by electric power of the battery (5), an inverter (6) for controlling drive of the electric motor (7) and a driver's cab (12), and the battery (5) is placed to be isolated from the engine (1) and the generator (3).

Abstract: A hydraulic shovel is provided which comprises a pair of left and right running/rotation pedals (3L and 3R) for running or rotating a vehicle, and a single running/rotation lever 7 which is installed separately from the pedals for similarly running or rotating the vehicle. The shovel allows the operator to run or rotate the vehicle by operating on the running/rotation pedals 3L and 3R, as well as by manipulating the running/rotation lever 7. Moreover, because the running/rotation lever 7 consists of a single lever, the operator can easily manipulate it by one hand, being relieved of complicated operations and inconveniencies encountered with the conventional machine, which ensures the improved operability.

Abstract: A hydraulic pipe arrangement of a working machine is not in contact with an obstacle and no torsion and no bending are generated. Accordingly, in a hydraulically driven type working machine provided with a boom (1) having a vertical swing supporting point supported at a base end side by a machine frame and a joint connection supporting point in a front end side, an arm (2) connected in a base end side to the joint connection supporting point, a boom driving hydraulic cylinder (6a) hoisting around a hoist supporting point provided in the machine frame so as to drive the boom, an arm driving hydraulic cylinder (7), and a working tool driving hydraulic cylinder (8), a swivel joint mechanism relaying a hydraulic pipe arrangement from a side of the machine frame is provided at a center of at least one of the vertical swing supporting point, the joint connection supporting point and the boom driving hydraulic cylinder hoist supporting point.

Abstract: A rubber crawler belt having a pattern of a lug provided on an outer circumferential side of a rubber belt has a central lug portion provided to continuously extend around a center portion in a width direction of the outer circumference of the rubber belt, in a waveform, and a plurality of branch lug portions each having a predetermined width and provided from the central lug portion toward left and right end portions of the rubber belt to be away therefrom diagonally in a circumferential direction, and an interval between the branched lug portions adjacent to each other being the same as an interval between drive protrusions, in the circumferential direction of the rubber belt.

Abstract: A hydraulic shovel is provided which comprises a pair of left and right running/rotation pedals (3L and 3R) for running or rotating a vehicle, and a single running/rotation lever 7 which is installed separately from said pedals for similarly running or rotating the vehicle. The shovel allows the operator to run or rotate the vehicle by operating on the running/rotation pedals 3L and 3R, as well as by manipulating the running/rotation lever 7. Moreover, because the running/rotation lever 7 consists of a single lever, the operator can easily manipulate it by one hand, being relieved of complicated operations and inconveniencies encountered with the conventional machine, which ensures the improved operability.

Abstract: Hybrid construction equipment leveling an engine load and effectively performing regeneration of energy is provided. For this purpose, the construction equipment includes a hydraulic pump (2) and a first electric motor (7) driven by an engine (1), a battery (9) for charging electric power generated by the first electric motor, a second electric motor (10) driven by electric power of the battery and functioning as a generator at a time of braking revolution, absorption torque detecting means (33, 34) for the hydraulic pump, and a controller (5) for controlling the first electric motor as a generator by surplus torque when absorption torque is smaller than predetermined output torque of the engine and controlling the first electric motor as a motor to generate an amount of shortage of torque when the absorption torque is larger than the predetermined torque.

Abstract: A hybrid construction equipment capable of sufficiently exhibiting performance of a battery with strategic arrangement of the apparatuses being carried out is provided. For this purpose, the hybrid construction equipment includes, on an upper revolving superstructure (10) rotatably placed on a lower traveling unit, an engine (1), a generator (3) driven by the engine (1), a battery (5) charged with electric power generated by the generator (3), an electric motor (7) driven by electric power of the battery (5), an inverter (6) for controlling drive of the electric motor (7) and a driver's cab (12), and the battery (5) is placed to be isolated from the engine (1) and the generator (3).

Abstract: A hydraulic pipe arrangement of a working machine is not in contact with an obstacle and no torsion and no bending are generated. Accordingly, in a hydraulically driven type working machine provided with a boom (1) having a vertical swing supporting point supported at a base end side by a machine frame and a joint connection supporting point in a front end side, an arm (2) connected in a base end side to the joint connection supporting point, a boom driving hydraulic cylinder (6a) hoisting around a hoist supporting point provided in the machine frame so as to drive the boom, an arm driving hydraulic cylinder (7), and a working tool driving hydraulic cylinder (8), a swivel joint mechanism relaying a hydraulic pipe arrangement from a side of the machine frame is provided at a center of at least one of the vertical swing supporting point, the joint connection supporting point and the boom driving hydraulic cylinder hoist supporting point.

Abstract: A rubber crawler belt with preferable riding quality without the fear of breakage is provided. For this purpose, a pattern of a lug (4) provided on an outer circumferential side of a rubber belt (2) has a central lug portion (5) provided to continuously extend around a center portion in a width direction of the outer circumference of the rubber belt (2), in a waveform, and a plurality of branch lug portions (6) each having a predetermined width and provided from said central lug portion (5) toward left and right end portions of the rubber belt (2) to be away therefrom diagonally in a circumferential direction, and an interval between the branched lug portions (6) adjacent to each other being the same as an interval between the drive protrusions (3), in the circumferential direction of the rubber belt (2).

Abstract: The present invention is a control device for a variable displacement hydraulic pump by which the absorption horsepower of the hydraulic pump increases with excellent responsiveness and ON/OFF operations of a cut-off control of the maximum pressure can be selected. To this end, a hydraulic pump (2), a slow return valve (25) and a switching valve (24) placed parallel to each other in a flow path connecting a servo piston (4) and a servo valve (5); a solenoid valve (26), for controlling the pilot pressure of the switching valve (24); and an ON/OFF operation selectable selector (30), connected to a control device (10), are included; and the controlling device (10) outputs a command signal to the solenoid valve (26) when the selector (30) is switched ON to lower the operation speed of the swash plate angle of the hydraulic pump (2).

Abstract: A workload detecting system for an excavating and loading apparatus, in which a bucket supporting member is vertically pivoted relative to a vehicle body and a bucket is actuated to be tilted with respect to the bucket supporting member. The system includes a bottom pressure detecting system (17) for detecting a bottom pressure of a cylinder (6) for vertically pivoting the bucket supporting member (5, 7), a, bucket earth and sand amount calculating system (18) for calculating an earth and sand weight within the bucket (9) on the basis of the detected bottom pressure, and a bucket earth and sand amount calculating summing system (31) for integrating the calculated bucket earth and sand weight.

Abstract: An apparatus for detecting an amount of metal powder in a hydraulic circuit for supplying a drain pressurized oil from a hydraulic pump driven by an engine is characterized by comprising a metal powder amount detection sensor (9) disposed in a flow passage of the pressurized oil and adapted to transmit a signal in proportion to an adhering amount of the metal powder and a controller (11) for calculating the metal powder amount from the signal outputted from the metal powder detection sensor and displaying the calculated amount.