Provided is a power steering device capable of causing control that uses a pump device and control that uses an electric motor on an input shaft to cooperate with each other. The power steering device includes a power cylinder including a pair of hydraulic chambers partitioned by a piston and configured to generate a steering assist force for a steered wheel, a pump device configured to be driven through control by a first electric motor and configured to discharge working fluid, a rotary valve configured to selectively supply the working fluid supplied from the pump device to the pair of hydraulic chambers in accordance with relative rotation between the input shaft and the output shaft, a second electric motor provided so as to surround at least a part in an axial direction of the input shaft and configured to control the rotation of the input shaft, and a second electric motor control part installed in a control device and configured to output a control signal for controlling driving of the second electric motor based on a revolution number signal of the first electric motor.

An assembly for supporting a vehicle chassis on a wheel of the vehicle includes a frame pivotably connected to the vehicle chassis at a connection location and a wheel attachment component slidingly coupled with the frame. The wheel attachment component is positioned on a first side of the connection location and is configured to pivot in unison with the frame and to move between a plurality of operating positions relative to the frame. A suspension component regulates motion transfer between the frame and the attachment component and is positioned on a second side of the connection location opposite the attachment component. An adjustment actuator is configured to shift the attachment component between any of the plurality of operating positions relative to the frame. The adjustment actuator is functionally independent of the suspension component.

An assembly for supporting a vehicle chassis on a wheel of the vehicle includes a frame pivotably connected to the vehicle chassis at a connection location and a wheel attachment component slidingly coupled with the frame. The wheel attachment component is positioned on a first side of the connection location and is configured to pivot in unison with the frame and to move between a plurality of operating positions relative to the frame. A suspension component regulates motion transfer between the frame and the attachment component and is positioned on a second side of the connection location opposite the attachment component. An adjustment actuator is configured to shift the attachment component between any of the plurality of operating positions relative to the frame. The adjustment actuator is functionally independent of the suspension component.

An inner-plate cam ring side recess portion is formed in a cam ring side end surface of an inner plate, communicates with a columnar groove which is a center side space in a vane grooves, and supplies a working fluid to the columnar groove. The inner-plate cam ring side recess portion is divided into multiple sections between a first side discharge port, through which the working fluid is discharged at a first discharge pressure from a pump chamber, and a second side suction port through which the working fluid is suctioned into a pump chamber discharging the working fluid at a second discharge pressure. An angle of a separation portion in a rotation direction is smaller than or equal to an angle between the first side discharge port and the second side suction port.

The invention proposes a vane pump (VP) with adjustable delivery volume, which vane pump has a pump housing (G), a cam ring (KR) arranged therein, and a rotor (R) which is rotatably movably mounted therein. The vane pump (VP) has a regulating device (RV) through which the delivered pressure medium (DM) flows and which has two outlets (A1, A2) which are each connected to one of two pressure chambers (DK1, DK2) in order to charge these with regulable proportions of the pressure medium (DM), wherein, to change the eccentricity of the cam ring (KR) relative to the rotor (R), the two pressure chambers (DK1, DK2) act on the outer surface of the cam ring (KR). The vane pump (VP) has two criss-crossing control ducts (STK*, STK#) which connect in each case one of the outlets (A1, A2) to one of the two pressure chambers (DK1, DK2) in order to charge these with the regulable proportions of the pressure medium (DM). The criss-crossing control ducts (STK*, STK#) are preferably arranged in a cover (D) of the pump housing such that the control ducts (STK*, STK#) are in a criss-crossing arrangement without coming into contact with one another. By means of this design, the vane pump (VP) can be easily reconfigured for a change in rotational direction of the rotor.

A method for detecting a malfunction in a hydraulic-assisted steering system for a vehicle includes: measuring a steering torque; determining the steering torque exceeding a threshold torque for a predetermined length of time; and generating a malfunction signal in response to the determining the steering torque exceeding the threshold torque for the predetermined length of time. A system for detecting a malfunction in a hydraulic-assisted steering system for a vehicle includes a torque sensor configured to measure a steering torque, and a controller configured to: determine the steering torque exceeding a threshold torque for a predetermined length of time; and generate a malfunction signal in response to determining the steering torque exceeding the threshold torque for the predetermined length of time.

A transportation vehicle includes: a cooling fan that is driven by a hydraulic motor; a heat exchanger that is disposed in a front portion of a vehicle body; a fan control valve that controls a flow of a hydraulic operating fluid supplied to the hydraulic motor; a cylinder control valve that controls a flow of the hydraulic operating fluid supplied to a hydraulic cylinder; and a controller. The fan control valve and the cylinder control valve are connected in tandem to a center bypass line. The fan control valve has a neutral position that makes a first hydraulic pump and the cylinder control valve communicate with each other and makes a suction port and a delivery port of the hydraulic motor and a hydraulic operating fluid tank communicate with each other, and a rotation position that makes the first hydraulic pump and the suction port of the hydraulic motor communicate with each other and makes the delivery port of the hydraulic motor and the hydraulic operating fluid tank communicate with each other.

A transportation vehicle includes: a cooling fan that is driven by a hydraulic motor; a heat exchanger that is disposed in a front portion of a vehicle body; a fan control valve that controls a flow of a hydraulic operating fluid supplied to the hydraulic motor; a cylinder control valve that controls a flow of the hydraulic operating fluid supplied to a hydraulic cylinder; and a controller. The fan control valve and the cylinder control valve are connected in tandem to a center bypass line. The fan control valve has a neutral position that makes a first hydraulic pump and the cylinder control valve communicate with each other and makes a suction port and a delivery port of the hydraulic motor and a hydraulic operating fluid tank communicate with each other, and a rotation position that makes the first hydraulic pump and the suction port of the hydraulic motor communicate with each other and makes the delivery port of the hydraulic motor and the hydraulic operating fluid tank communicate with each other.

A transportation vehicle includes: a cooling fan that is driven by a hydraulic motor; a heat exchanger that is disposed in a front portion of a vehicle body; a fan control valve that controls a flow of a hydraulic operating fluid supplied to the hydraulic motor; a cylinder control valve that controls a flow of the hydraulic operating fluid supplied to a hydraulic cylinder; and a controller. The fan control valve and the cylinder control valve are connected in tandem to a center bypass line. The fan control valve has a neutral position that makes a first hydraulic pump and the cylinder control valve communicate with each other and makes a suction port and a delivery port of the hydraulic motor and a hydraulic operating fluid tank communicate with each other, and a rotation position that makes the first hydraulic pump and the suction port of the hydraulic motor communicate with each other and makes the delivery port of the hydraulic motor and the hydraulic operating fluid tank communicate with each other.

A transportation vehicle includes: a cooling fan that is driven by a hydraulic motor; a heat exchanger that is disposed in a front portion of a vehicle body; a fan control valve that controls a flow of a hydraulic operating fluid supplied to the hydraulic motor; a cylinder control valve that controls a flow of the hydraulic operating fluid supplied to a hydraulic cylinder; and a controller. The fan control valve and the cylinder control valve are connected in tandem to a center bypass line. The fan control valve has a neutral position that makes a first hydraulic pump and the cylinder control valve communicate with each other and makes a suction port and a delivery port of the hydraulic motor and a hydraulic operating fluid tank communicate with each other, and a rotation position that makes the first hydraulic pump and the suction port of the hydraulic motor communicate with each other and makes the delivery port of the hydraulic motor and the hydraulic operating fluid tank communicate with each other.