Abstract: An actuator unit includes a rod side chamber and a piston side chamber defined by a piston; a tank; a first opening/closing valve communicating the rod side chamber with the piston side chamber; a second opening/closing valve communicating the piston side chamber with the tank; an suction passage allowing a working fluid to flow from the tank toward the piston side chamber; a rectifying passage allowing the working fluid to flow from the piston side chamber toward the rod side chamber; a pump suppling the working fluid to the rod side chamber; a first discharge passage and a second discharge passage respectively communicating the rod side chamber to the tank; a first passive valve provided on the first discharge passage; a second passive valve provided on the second discharge passage; and a third passive valve configured to communicate and block the first discharge passage.

Abstract: A load control device includes a load control means that drives a load, a current detection resistor, a differential amplifier and a current calculation means. The load control means can switch between a standby state a drive state, a state in which a first of the switching elements is turned ON and a second of the switching elements is turned OFF and a state in which the first of the switching elements is turned OFF and the second of the switching elements is turned ON being alternately repeated in the standby state, in which both of the switching elements are turned ON in the drive state. The current calculation means calculates a current that flows to the current detection resistor on the basis of a value output from the differential amplifier in the drive state and an offset value output from the differential amplifier in the standby state.

Abstract: A solenoid valve includes a main valve having a valve seat and a main valve body configured to open or close a main flow passage, a pilot passage that branches from the main flow passage, an orifice provided in the pilot passage, a back-pressure chamber configured to bias the main valve body to a closing direction by virtue of an internal pressure, a pilot valve configured to control an internal pressure of the back-pressure chamber, and a solenoid configured to control a valve opening pressure of the pilot valve. There is a time difference between a valve opening timing of the main valve and a valve opening timing of the pilot valve such that the valve opening timing of the main valve is delayed from the valve opening timing of the pilot valve.

Abstract: A damping valve includes: a valve disc having a port a shaft member provided in the valve disc; an annular leaf valve that is attached to an outer periphery of the shaft member so as to be adjacent to the valve disc; a main valve provided on the outer periphery of the shaft member to be free to move in the axial direction; and an annular plate spring that biases the leaf valve toward the valve disc side. The main valve includes a spring supporting portion that contacts an end surface of the leaf valve and supports a valve disc side end portion of the plate spring, and a tubular collar that extends in the axial direction, and is provided to be free to move in the axial direction relative to the shaft member. The plate spring is attached to an outer periphery of the collar.

Abstract: An apparatus for diagnosing an abnormality in a torque sensor that is connected to a controller of an electric power steering apparatus by two systems includes a steering speed determination unit that determines whether a variation speed of a steering angle equals or exceeds a predetermined speed on the basis of a detection result from a steering angle sensor, an integrated value calculation unit that calculates an integrated value of an input torque detected by the torque sensor within a sampling period extending from a point at which a steering wheel is steered at or above the predetermined speed to a point at which the steering wheel returns to a neutral position, and an abnormality determination unit that determines that an abnormality has occurred in the torque sensor when the integrated value of the input torque is equal to or smaller than a predetermined reference integrated torque.

Abstract: A control system for construction machine includes a main pump; a circuit system which includes a plurality of operation valves; a boom cylinder which is connected to a specific valve; one passage which allows communication between the specific operation valve and a piston-side chamber; another passage which allows communication between the specific operation valve and a rod-side chamber; a hydraulic motor which rotates by the action of return oil from the piston-side chamber; a generator; and a valve mechanism which is provided in the one passage communicating with the piston-side chamber of the boom cylinder, introduces the return oil from the piston-side at the time of descent as a regeneration flow to the hydraulic motor and introduces the return oil as a recovery flow to the rod-side chamber if necessary by causing the return oil to flow into the other passage.

Abstract: The vane pump includes a rotor, a plurality of slits, vanes that are respectively received in the slits, a cam ring that has an inner circumferential cam face with which tip portions of the vanes are brought into sliding contact, pump chambers that are defined by the rotor, the cam ring, and the adjacent vanes, a side member that has a sliding contact surface with which the side surface of the rotor is brought into sliding contact, a discharge port that is formed so as to open to the side member, the discharge port being configured to guide working fluid discharged from the pump chamber, and a notch that are provided on the side member so as to extend from the opening of the discharge port in direction opposite to rotating direction of the rotor. The notch is formed radially outside of the protruded portion of the rotor.

Abstract: A knuckle bracket includes a cylindrical bracket main body that is fixed by welding to an outer periphery of an outer tube of a shock absorber and a pair of gripping pieces that extend along an axial direction of the bracket main body and stand up toward the outside from the bracket main body opposing each other. The bracket main body has a cut-away part formed on one side end and a compression part, the compression part being configured to abut a misassembly detection pin of a misassembly prevention device, the misassembly prevention device being configured to identify a type of the knuckle bracket.

Abstract: A cylinder unit includes a cylinder, a rod guide, a piston, a piston rod, and a rebound member provided between the rod guide and the piston to absorb impact generated when the cylinder unit is fully extended. The rebound member includes a coil spring arranged around an outer circumference of the piston rod and a pair of upper and lower holder members fitted to the fixing portions formed in both ends of the coil spring so that the piston rod is inserted into a shaft center hole. The center portion formed between the fixing portions of the coil spring has a diameter smaller than that of the fixing portion.

Abstract: An actuator unit includes two chambers defined in the cylinder; a supply passage allowing a working fluid discharged from the pump to be supplied to the two chambers; a discharge passage allowing the two chambers to communicate with the tank; a direction control valve configured to selectively communicate each of the two chambers with one of the pump and the tank; a control passage that branches from the supply passage on a side of the pump rather than the direction control valve so as to communicate the pump with the tank; a variable relief valve provided on the control passage, the variable relief valve opening so as to allow the working fluid to flow from the supply passage toward the tank when a pressure in the supply passage reaches the valve opening pressure; and a center passage that communicates the tank with an interior of the cylinder.

Abstract: A damper control device controls vibration of an unsprung member by controlling a damping force of a damper interposed between a sprung member and the unsprung member of a vehicle on the basis of a damping property prepared in advance. The damper control device includes a correction unit that extracts a sprung resonant frequency component of a stroke velocity of the damper, and corrects a damping force target value of the damper on the basis of the extracted above-spring resonant frequency component.

Abstract: A damper control device controls a damping force of each damper interposed between a vehicle body and a corresponding one of a plurality of vehicle wheels of a vehicle. The damper control device includes: a good wavy road control calculation unit that obtains, for each damper, a good wavy road control instruction suitable for a good wavy road representing a wavy road surface; a bad wavy road control calculation unit that obtains, for each damper, a bad wavy road control instruction suitable for a bad wavy road that has more concavities and convexities than the good wavy road; and a final instruction calculation unit that obtains a final control instruction for each damper based on the good wavy road control instruction and on the bad wavy road control instruction.

Abstract: A fluid pressure control device includes a switching valve configured to operate in conjunction with the control valve by the pilot pressure led through the pilot valve to switch work of the operation check valve. The switching valve includes a pilot chamber to which the pilot pressure is led, a spool that moves in accordance with the pilot pressure of the pilot chamber, a bias member that biases the spool in the valve closing direction, a collar detachably installed in the pilot chamber, and a piston slidably inserted into the collar, the piston being configured to receive the pilot pressure on a back surface thereof and give thrust force to the spool against bias force of the bias member.

Abstract: A magnetorheological fluid shock absorber includes a piston slidably arranged in a cylinder in which magnetorheological fluid is sealed. The piston includes a piston core which is attached to an end part of a piston rod and on the outer periphery of which a coil is provided, a flux ring which surrounds the outer periphery of the piston core and forms a flow passage for the magnetorheological fluid between the piston core and the flux ring, a first plate which is arranged on the outer periphery of the piston rod and specifies the position of one end of the flux ring in an axial direction with respect to the piston core, a second plate which is arranged on the inner periphery of the other end of the flux ring, and a first snap ring which is fitted to the inner periphery of the flux ring and fixes the second plate.

Abstract: A seal member includes an annular fitting part and an annular dust lip. The fitting part fits on an inner circumference of a tubular member. The dust lip extends from the fitting part toward a side opposite from the tubular member such that a diameter of an inner circumference of the dust lip gradually decreases, and a distal end portion of the dust lip slides on an outer circumferential surface of a shaft member. A metal insert includes a reinforcing ring and a reinforcing extension piece. The reinforcing ring stands along the inner circumference of the tubular member. The reinforcing extension piece extends from the reinforcing ring toward a side opposite from the tubular member, and inclines such that a distal end of the reinforcing extension piece approaches the shaft member. The reinforcing ring is arranged in the fitting part, whereas the reinforcing extension piece is arranged in the dust lip.

Abstract: An actuator unit includes a rod side chamber and a piston side chamber defined in the cylinder by a piston; a tank; a direction control valve configured to allow a working fluid discharged from the pump to be supplied selectively to the rod side chamber and the piston side chamber; a first control passage the rod side chamber with the tank; a second control passage the piston side chamber with the tank; a first variable relief valve provided on the first control passage, the first variable relief valve being configured to be varied a valve opening pressure; a second variable relief valve provided on the second control passage, the second variable relief valve configured to be varied a valve opening pressure; and a center passage the tank with a interior of the cylinder.

Abstract: A shock absorber includes a shock absorber body having an outer shell and a piston rod, the shock absorber body being configured to generate a damping force for suppressing relative movement in an axial direction of the piston rod with respect to the outer shell; a dust cover connected to the piston rod, the dust cover allowing the outer shell to enter an inner part; an extension cover formed in a belt-like shape to be wound around an outer circumference of the dust cover, the extension cover extending from the dust cover to an outer shell side, the outer shell being inserted into an inner side of the extension cover; and a fixing member configured to fix the extension cover in a state that the extension cover is wound around the outer circumference of the dust cover.

Abstract: A shock absorber includes a valve disc defining two chambers, a flow passage formed in the valve disc, the flow passage allowing communication between the two chambers, and a plurality of leaf valves formed in the shape of annular plates, the plurality of leaf valves being stacked on the valve disc to openably close an outlet of the flow passage. The leaf valve disposed on the tail end of the plurality of leaf valves stacked on the valve disc includes a rib projecting in an axial direction from one flat surface and recessed on an opposite side.

Abstract: A bus bar unit manufacturing method by insert-molding a plurality of bus bars using insulating resin includes a primary setting step of disposing the plurality of bus bars on a support portion provided in a first die such that the plurality of bus bars are separated from each other in a bus bar axial direction, an insertion step of inserting a gap maintaining member between the bus bars, the gap maintaining member being a member that maintains gaps between the adjacent bus bars disposed on the support portion and is provided to be capable of moving relative to the support portion, and a primary molding step of executing insert molding by injecting the insulating resin into the first die in a condition where the gap maintaining member is inserted between the bus bars.

Abstract: A shock absorber includes a valve disc defining two chambers, a flow passage formed in the valve disc, the flow passage allowing communication between the two chambers, a window formed in the valve disc, the window being connected to the flow passage, a valve seat formed on the valve disc, the valve seat surrounding the outer periphery of the window; and a plurality of leaf valves formed in the shape of annular plates, the plurality of leaf valves being stacked on the valve disc. The first leaf valve stacked on the valve disc is provided such that an outer peripheral part is seatable on and separable from the valve seat, and includes a rib recessed on a valve disc side and projecting on an opposite valve disc side at a position facing the valve seat.