Abstract: A hydraulic control circuit includes a hydraulic cylinder, a control valve, a recovery oil passage, a hydraulic pump, an engine rotation speed setting unit, a recovery control valve, and a controller that reduces an engine rotation speed to not more than a preset reduction control engine rotation speed when the load is lowered; and adjusts an increase or decrease in an opening amount of the recovery control valve in accordance with a level of the target rotation speed set by the engine rotation speed setting unit.

Abstract: A locking device includes a lock body that includes an engagement groove with or from which the closing-side and opening-side lock receivers are engaged or disengaged, the lock body being variable between a neutral posture in which the closing-side and opening-side lock receivers are allowed to be engaged with or disengaged from the engagement groove; a closing-side locking posture in which the closing-side lock receiver that is engaged with the engagement groove is regulated so as not to be disengaged from the engagement groove; or an opening-side locking posture in which the opening-side lock receiver that is engaged with the engagement groove is regulated so as not to be disengaged from the engagement groove; a holding member and a release operation lever.

Abstract: In a multilayered sintered sliding member, a porous sintered alloy layer comprising 3 to 10 wt. % of an Sn component, 10 to 30 wt. % of an Ni component, 0.5 to 4 wt. % of a P component, 30 to 50 wt. % of an Fe component, 1 to 10 wt. % of a high-speed tool steel component, 1 to 5 wt. % of a graphite component, and 20 to 55 wt. % of a copper component is integrally diffusion-bonded to a backing plate.

Abstract: A cab in a construction machine, the cab including frame members including a hollow first frame member connected to a second frame member in order to form a corner portion, the first frame member including a pass-through portion formed at a first side surface portion of the first frame member; a reinforcing member that is installed at the corner portion, wherein at least one of two sides of the reinforcing member passes through the pass-through portion and abuts against an inner surface of a second side surface portion of the first frame member that is at an opposite side of the first side surface portion; and a reinforcing plate that abuts against an outer surface of the second side surface portion, wherein the at least one of two sides of the reinforcing member is supported and reinforced by the reinforcing plate.

Abstract: The present invention provides a door panel that comprises an outer panel and an inner panel joined together at adhering portions and, regardless of whether rib portions are formed on the adhering portions in order to prevent deformation of the adhering portions or for other purpose, can be modified to withstand severe heat by means of formation of large ventilation openings in the adhering portions without significantly impairing the shape or the strength of the door panel.

Abstract: A cab in a construction machine, the cab including frame members including a hollow first frame member connected to a second frame member in order to form a corner portion, the first frame member including a pass-through portion formed at a first side surface portion of the first frame member; a reinforcing member that is installed at the corner portion, wherein at least one of two sides of the reinforcing member passes through the pass-through portion and abuts against an inner surface of a second side surface portion of the first frame member that is at an opposite side of the first side surface portion; and a reinforcing plate that abuts against an outer surface of the second side surface portion, wherein the at least one of two sides of the reinforcing member is supported and reinforced by the reinforcing plate.

Abstract: A work machine equipped with an automatic hammering function is capable of preventing breakage of the hammer caused by blank firing. Hydraulic oil fed to a hydraulic breaker at the distal end of a work machine is controlled by first and second spools. Operating an operation lever so as to contract single rod type boom cylinders to press the hydraulic breaker against an object to be crushed. Head-side pressure and rod-side pressure of the boom cylinders are respectively detected by pressure sensors. Any one of switches is used to switch the mode of automatic hammering operation between an automatic hammering inhibiting mode and an automatic hammering authorizing mode. In the automatic hammering authorizing mode, a controller controls the first and second spools of the hydraulic breaker so as to open them only when head-side pressure and rod-side pressure of the boom cylinders are in a given range of pressing force.

Abstract: To facilitate the production of a cab in the form of a box by joining side, rear and roof panels to pillars, and to improve the productivity. Pillars forming the cab (2) include composite pillars (16, 18) obtained by juxtaposing and joining together the pairs of pillar members (20, 22), and panel assemblies (4, 6, 8) adjacent to the pillar members (20, 22) are joined to the pillar members (20, 22) of the composite pillars (16, 18).

Abstract: A second hinge plate supported pivotally on a first hinge plate using a shaft member so as to open and close. In the second hinge plate, a bracket is molded integrally at the upper edge of the end opposite the shaft member. A vertical shaft of a hold-stay rod is loosely fitted into a shaft hole of the bracket so as to move rotationally and slide in a vertical direction. A horizontal shaft of the hold-stay rod is inserted into a guide hole of a guide plate welded to the first hinge plate and slidable, and a stopper is folded and formed at the leading end of the hold-stay rod. The stopper is inserted into an engaging hole by movement from a guide to a receiving plate due to the opening movement of the second hinge plate and can be taken out from the engaging hole by a pushing-up operation.

Abstract: In a swash plate hydraulic pump or motor structured so that a convex arc surface on the back surface of a swash plate is supported on a concave arc surface of a swash plate support via a bearing in a manner enabling the arc surface to swing in the circumferential direction that follows the arc path. A restricting pin is included for restricting movements of the bearing. The assembly structure prevents the restricting pin from coming out of the swash plate and the swash plate support. One end of the restricting pin is supported rotatably on a side surface of the swash plate. An intermediate portion of the restricting pin is engaged in an engagement hole formed in a holder of the bearing in a loosely fitting manner. Finally, the other end of the restricting pin is inserted into a support rod supported rotatably around its axis on the swash plate support to permit movement of the restricting pin in a pin axial direction.

Abstract: The present invention provides a door panel that comprises an outer panel and an inner panel joined together at adhering portions and, regardless of whether rib portions are formed on the adhering portions in order to prevent deformation of the adhering portions or for other purpose, can be modified to withstand severe heat by means of formation of large ventilation openings in the adhering portions without significantly impairing the shape or the strength of the door panel.

Abstract: A method of controlling an electro-hydraulic system having an engine driving a variable displacement pump, a hydraulic valve and a hydraulic actuator in order to achieve more efficient engine operation is disclosed. The pressures in the electro-hydraulic system are monitored and commands are received indicating the desired movement of the hydraulic actuator. Based on the pressure and the commands, the operation being performed by the machine is determined and the engine is set to an efficient setting for the particular segment of machine operation.

Abstract: A vehicle includes a cab; a front window that is capable of moving between a closed position where a window opening at a front surface of the cab is closed and an open position where the front window is housed in a ceiling portion of the cab and the window opening is open; and a guide structure for the front window that guides the front window between the closed position and the open position.

Abstract: A console upturnably provided adjacent to an access area for gaining access to a seat installed in a work machine is provided with a release lever, to disengage a console securing locking portion and enabling the console to be upturned. The console has a hydraulic locking lever. Shifting the hydraulic locking lever to an opening position unblocks the access area, and performs a locking function to disable operation of the work machine; shifting the hydraulic locking lever to a blocking position to block the access area performs an unlocking function, thereby enabling operation of the work machine. Provided in relation to the release lever is a lever operation restraining mechanism that disengages the release lever and enables the console to be upturned when the hydraulic locking lever is in the opening position, and prevent upturning operation when the hydraulic locking lever is in the blocking position.

Abstract: A locking device includes a lock body that includes an engagement groove with or from which the closing-side and opening-side lock receivers are engaged or disengaged, the lock body being variable between a neutral posture in which the closing-side and opening-side lock receivers are allowed to be engaged with or disengaged from the engagement groove; a closing-side locking posture in which the closing-side lock receiver that is engaged with the engagement groove is regulated so as not to be disengaged from the engagement groove; or an opening-side locking posture in which the opening-side lock receiver that is engaged with the engagement groove is regulated so as not to be disengaged from the engagement groove; a holding member and a release operation lever.

Abstract: A door panel that is light in weight and has sufficient strength is provided. A door panel has an outer panel, an inner panel, and a foamed material filling a space between the outer panel and the inner panel. The inner panel is formed by means of press molding so as to have an uneven surface with adhering portions and a raised portion. The adhering portions are affixed to the inner surface of the outer panel, and the space is formed between the raised portion and the outer panel. The outer panel has a thickness ranging from 1.2 to 5.0 times that of the inner panel. A hemmed portion is formed by folding the peripheral edge of the outer panel so as to curl over the peripheral edge of the inner panel and then pressing down the folded part.

Abstract: A hydraulic control circuit includes a hydraulic cylinder, a control valve, a recovery oil passage, a hydraulic pump, an engine rotation speed setting unit, a recovery control valve, and a controller that reduces an engine rotation speed to not more than a preset reduction control engine rotation speed when the load is lowered; and adjusts an increase or decrease in an opening amount of the recovery control valve in accordance with a level of the target rotation speed set by the engine rotation speed setting unit.

Abstract: A door panel that is capable of ensuring sufficient strength at a portion where a hinge is attached to a double-panel structure including an outer panel and an inner panel, and is also capable of preventing entry of rain water or the like from the aforementioned portion, is provided. An internal reinforcing plate for mounting hinges is immovably sandwiched between the outer panel and the inner panel, which is affixed to the inner surface of the outer panel. The internal reinforcing plate has bolt insertion holes, and nuts that are conjoined with the reverse surface of the internal reinforcing plate. The inner panel includes hinge mounting surface portions provided at such a location as to overlap the internal reinforcing plate. The hinge mounting surface portions have bolt insertion holes.

Abstract: The aperture area efficiency of a door panel with a double-panel structure having an outer panel and an inner panel is increased, while turbulent flow of air through ventilation holes is reduced. The outer panel 21 is provided with a plurality of honeycomb ventilation hole sections 26, each of which comprises a plurality of hexagonal ventilation holes 25 that are formed in the outer panel 21 so as to be arranged in a honeycomb pattern, with each side of each ventilation hole 25 being adjacent to a side of another ventilation hole 25 with a connecting portion 25a therebetween. The inner panel 23 is provided with ventilation openings 30, each of which is slightly larger than each respective honeycomb ventilation hole section 26 of the outer panel 21.

Abstract: There are provided an apparatus and a method for compressing data, an apparatus and a method for analyzing data and a data management system, which are capable of compressing huge data and accurately reproducing the characteristics of the original data from the compressed data. The data compressing apparatus includes detection means for detecting a multiplicity of data sets, each including n parameter values that vary according to an operation of an object, where n is a natural number; and data compressing means for compressing the data sets by inputting the data sets into an n-dimensional space, arranging neurons smaller in number than the data sets in the n-dimensional space, carrying out unsupervised learning for a neural network on the neurons, and converting the data sets into a neuron model parameter characterizing a neuron model obtained by the unsupervised learning.