Abstract: A hydraulic excavator comprises a main valve that sits on an upper structure to the right of a work implement, and an attachment component that gathers a plurality of hydraulic hoses that are connected at a first end to the main valve and fixes them on the upper face of a boom.

Abstract: A control device for a hydraulically driven fan is provided with a cooling fan which is rotated by a hydraulic motor and carries out ventilation for cooling a working fluid. Further, the control device for the hydraulically driven fan is provided with a sensor for detecting a temperature of the working fluid, and a lever switch for detecting whether a working mechanism actuated by the engine is in a stopped state, by determining whether a working machine lever has been operated. In order that a resonance between the cooling fan and the engine is suppressed, the control device for the hydraulically driven fan further adjusts a rotating speed of the hydraulic motor in correspondence to a detection result by the lever switch. In the case that a stopped state of the working mechanism is detected on the basis of an operation state of the working machine lever by the lever switch, the rotating speed of the hydraulic motor is adjusted.

Abstract: The operating system for a construction machine gives advice on efficient operation to an operator. A specified state value relating to the operational condition of the construction machine, for example, the hydraulic oil pressure or engine speed, is detected (S101), and the frequency distribution of the state value in prescribed time intervals is calculated (S102). The variable range of the state value is classified into plural regions beforehand, and different target values are pre-set for each these regions. For each region, the frequency distribution is compared with the target value (S104, 106, 108, 110, 112), and as a result of the comparison, a applicable message is selected from the prescribed messages and output (S105, 107, 109, 111, 113). The output message may also be selected according to the combination of the comparison results for the plural state values such as the hydraulic oil pressure and engine speed.

Abstract: To provide a construction machine capable of encouraging an operator to perform the driving and the operation for enhancing fuel efficiency. The construction machine includes information providing means 30 to notify the operator of the information such as the operation and/or an operational method or the like to enhance the fuel efficiency. The present construction machine provides the information by monitor display on a monitor screen 26 that is provided in an operator's cabin 11. When operating machine levers 19 and 20 are positioned at a neutral position, if an engine 40 has the idle revolution number not less than a predetermined time, the information providing means 30 provides the information such as the operation or the like to enhance the fuel efficiency.

Abstract: A control device for a hydraulically driven fan is provided with a cooling fan which is rotated by a hydraulic motor and carries out ventilation for cooling a working fluid. Further, the control device for the hydraulically driven fan is provided with a sensor for detecting a temperature of the working fluid, and a lever switch for detecting whether a working mechanism actuated by the engine is in a stopped state, by determining whether a working machine lever has been operated. In order that a resonance between the cooling fan and the engine is suppressed, the control device for the hydraulically driven fan further adjusts a rotating speed of the hydraulic motor in correspondence to a detection result by the lever switch. In the case that a stopped state of the working mechanism is detected on the basis of an operation state of the working machine lever by the lever switch, the rotating speed of the hydraulic motor is adjusted.

Abstract: Construction machinery is capable of prompting an operator to control or operate the machinery to improve fuel consumption. The fuel consumption per time or the fuel consumption per work amount is measured, and an image showing a difference between the measured fuel consumption per time and a set fuel consumption per time or between the measured fuel consumption per work amount and a set fuel consumption per work amount is displayed on a display device (30). When the measured fuel consumption per time is larger than the preset fuel consumption per time or the measured fuel consumption per work amount is larger than the set fuel consumption per work amount, an indication for prompting the operator to improve the fuel consumption is displayed on the display device (30).

Abstract: The operating system for a construction machine gives advice on efficient operation to an operator. A specified state value relating to the operational condition of the construction machine, for example, the hydraulic oil pressure or engine speed, is detected (S101), and the frequency distribution of the state value in prescribed time intervals is calculated (S102). The variable range of the state value is classified into plural regions beforehand, and different target values are pre-set for each these regions. For each region, the frequency distribution is compared with the target value (S104, 106, 108, 110, 112), and as a result of the comparison, a applicable message is selected from the prescribed messages and output (S105, 107, 109, 111, 113). The output message may also be selected according to the combination of the comparison results for the plural state values such as the hydraulic oil pressure and engine speed.

Abstract: To provide a construction machine capable of encouraging an operator to perform the driving and the operation for enhancing fuel efficiency. The construction machine includes information providing means 30 to notify the operator of the information such as the operation and/or an operational method or the like to enhance the fuel efficiency. The present construction machine provides the information by monitor display on a monitor screens 26 that is provided in an operator's cabin 11. When operating machine levers 19 and 20 are positioned at a neutral position, if an engine 40 has the idle revolution number not less than a predetermined time, the information providing means 30 provides the information such as the operation or the like to enhance the fuel efficiency.

Abstract: To provide a construction machine capable of encouraging an operator to perform the driving and the operation for enhancing fuel efficiency. The construction machine includes information providing means 30 to notify the operator of the information such as the operation and/or an operational method or the like to enhance the fuel efficiency. The present construction machine provides the information by monitor display on a monitor screen 26 that is provided in an operator's cabin 11. When operating machine levers 19 and 20 are positioned at a neutral position, if an engine 40 has the idle revolution number not less than a predetermined time, the information providing means 30 provides the information such as the operation or the like to enhance the fuel efficiency.

Abstract: Construction machinery is capable of prompting an operator to control or operate the machinery to improve fuel consumption. The fuel consumption per time or the fuel consumption per work amount is measured, and an image showing a difference between the measured fuel consumption per time and a set fuel consumption per time or between the measured fuel consumption per work amount and a set fuel consumption per work amount is displayed on a display device (30). When the measured fuel consumption per time is larger than the preset fuel consumption per time or the measured fuel consumption per work amount is larger than the set fuel consumption per work amount, an indication for prompting the operator to improve the fuel consumption is displayed on the display device (30).

Abstract: To provide a construction machine capable of encouraging an operator to perform the driving and the operation for enhancing fuel efficiency. The construction machine includes information providing means 30 to notify the operator of the information such as the operation and/or an operational method or the like to enhance the fuel efficiency. The present construction machine provides the information by monitor display on a monitor screens 26 that is provided in an operator's cabin 11. When operating machine levers 19 and 20 are positioned at a neutral position, if an engine 40 has the idle revolution number not less than a predetermined time, the information providing means 30 provides the information such as the operation or the like enhance the fuel efficiency.

Abstract: A zoom lens is disclosed, comprising, from front to rear, a first, second and third lens units of positive, positive and negative refractive powers, respectively, all the lens units moving forward to effect zooming from the wide-angle end to the telephoto end, the first lens unit including at least one negative and at least one positive lenses, and the second lens unit including a negative lens whose front surface is concave, a positive lens and a cemented lens composed of a negative lens whose rear surface is concave and a bi-convex lens, and the zoom lens satisfying the following condition:0.2<.beta..sub.2W /.beta..sub.3W <0.5 (where .beta..sub.2W >0, .beta..sub.3W >0)where .beta..sub.2W and .beta..sub.3W are the lateral magnifications in the wide-angle end of the second and third lens units, respectively.

Abstract: A zoom lens is disclosed comprising, from front to rear, a first lens unit having a positive refractive power, a second lens unit having a positive or negative refractive power, a third lens unit having a positive refractive power, and a fourth lens unit having a negative refractive power, wherein rules of design are set forth in order to minimize the bulk and size of the lens system.

Abstract: A zoom lens comprising, from front to rear, a first lens unit of negative refractive power, a second lens unit of positive refractive power and a third lens unit of negative refractive power, wherein during zooming from the wide-angle end to the telephoto end, at least the second lens unit and the third lens unit move axially forward, and the following conditions are satisfied: ##EQU1## where f.sub.W and f.sub.T are the shortest and longest focal lengths of the entire system, respectively, f.sub.1 is the focal length of the first lens unit, f.sub.2 is the focal length of the second lens unit, and f.sub.3 is the focal length of the third lens unit.