1. Control Device

2. A control device for controlling a hydraulic consumer (2), such as a working cylinder, consisting of at least one control valve (18) having a control spool (20), which is guided in a valve housing (22) in a longitudinally movable manner and which can be actuated by means of an electric motor (24) and which can be controlled by means of control electronics (MC), which receive input signals from a sensor device (58, 60, 62), which detects at least one operating state of the consumer (2).

A vehicle height adjusting apparatus includes: a cylindrical body internally partitioned into a plurality of oil chambers by a partition wall provided along an axis, the oil chambers filled with oil, and respectively provided with cylindrical body oil holes to be connected to an outside; one operating portion rotatably provided on the cylindrical body, and rotated to be moved along the axis; pistons moved along the axis by the operating portion, and received in the oil chambers respectively; and a plurality of damper devices respectively provided with damper oil holes into which the oil flowing out of the cylindrical body oil holes when the pistons move flows, the damper devices that can adjust a vehicle height by amounts of the oil filled into the damper devices through the damper oil holes, and that can absorb impact energy inputted on a wheel.

The invention relates to a hydraulic system for controlling or regulating a hydraulic cylinder comprising—at least one hydraulic cylinder, at least one hydraulic unit by means of which the hydraulic cylinder can be optionally connected to a pressure source and a tank and at least one control or regulating device for controlling or regulating the supply of hydraulic fluid to the hydraulic cylinder, the control or regulating device forms a first assembly and the hydraulic unit forms a second assembly which are structurally separate from one another and fluidically connected, wherein the supply of hydraulic fluid to the hydraulic cylinder can be predominantly controlled or regulated by the control or regulating device from outside the hydraulic unit and wherein the hydraulic unit is rigidly fastened on the hydraulic cylinder.

A concurrent leveling system includes a pressurized air source. A manifold block, having a body defining an air feed inlet, is disposed between air springs and the pressurized air source. The body includes front and rear suspension valves. Each of the suspension valves defines a suspension valve orifice having a first predetermined diameter. The body includes at least one restrictor valve parallel to and in fluid communication with the front suspension valves. The at least one restrictor valve includes a first check valve and a first blocker valve orifice defining a first orifice diameter. The first check valve and the first blocker valve orifice are disposed parallel to one another and in series with the front suspension valves and in fluid communication with the air feed inlet and the front suspension valves for reducing fluid back flow to allow the vehicle to be lowered in nominal loading conditions.

A suspension system for a vehicle includes a knuckle defining a bore therethrough. The suspension system includes a wheel hub rotatably mounted on the knuckle. Further, the suspension system includes an axle at least partially received within the bore of the knuckle and operatively coupled to the wheel hub. The suspension system includes a pump driven by the axle and configured to generate pressurized fluid. The suspension system includes an actuator receiving pressurized fluid from the pump.

An air suspension system capable of raising both the vehicle front wheel side and the vehicle rear wheel side by using a single tank. The air suspension system (1) includes a front wheel-side air suspension (2) and a rear wheel-side air suspension (7) which are interposed between a vehicle body and associated axles to perform vehicle height adjustment in response to supply and discharge of air, a compressor (17) for compressing air, and a tank (27) for storing air compressed by the compressor. When the vehicle height is to be raised by the air suspensions, the front wheel-side air suspension is supplied with compressed air from the tank, and the rear wheel-side air suspension is supplied with compressed air from the tank after the compressed air has been pressurized by the compressor.

A vehicle control method is provided. The vehicle includes an air suspension system, an air spring and an air storage tank in the air suspension system, which are connected through an air circuit. The method includes: obtaining a spring air pressure of the air spring and an air tank air pressure of the air storage tank; and adjusting, in response to determining that the spring air pressure and the air tank air pressure meet a preset condition, a height of an axle corresponding to the air spring in the vehicle by controlling connection or disconnection of the air circuit between the air spring and the air storage tank.

This oscillating axle (3) for a lifting device (1) comprises an axle bridge (5) at the ends of which are mounted two ground connection members (7), an oscillation axis (X3), a left jack (9) and a right jack (11), each jack (9, 11) having a rod (90, 110) in contact with the bridge (5) and a body (92, 112) fixed on a fixed part (13) of a chassis (2) of the lifting device (1), the body (92, 112) forming a chamber (94, 114) in which the rod (90, 110) moves. The axle comprises a hydraulic circuit (15) interconnecting the chambers (92, 112) of the left (9) and right (11) jacks, in which a fluid is present at a given pressure, making it possible to press the rods (90, 110) of the left jack (9) and of the right jack (11) against the bridge (5), and at least one solenoid valve (150, 152) on a branch (15A) of the hydraulic circuit (15) connected to the chamber (94) of the left jack (9), and at least one solenoid valve (154, 156) on a branch (15B) of the hydraulic circuit (15) connected to the chamber (114) of the right jack (11), wherein each of these solenoid valves (150, 152, 154, 156) may be positioned in an open position, in which fluid may flow freely, and a closed position, in which the fluid is trapped in the chamber (94, 114) of the corresponding jack (9, 11). Each of the chambers (94, 114) of the left jack (9) and of the right jack (11) has a pressure sensor (23, 25) designed to measure the pressure of the fluid in each of the chambers (94, 114). Control means (21) are provided to detect a pressure in one of the chambers (94, 114) that is greater than a first threshold, and/or a differential between the pressures in each of the chambers (94, 114) that is greater than a second threshold, so as to detect the blocking of a solenoid valve (150, 152, 154, 156) in the closed position, and to initiate a safety procedure.

A vehicle height adjustment system includes: a cylinder housing part having an inner space configured to receive working fluid; a piston part positioned in the cylinder housing part, the piston part configured to move linearly, in response to a working fluid, in a moving direction along the cylinder housing part; and a rotation suppressing bracket coupled to the cylinder housing part and connected to a side surface of the piston part, the rotation suppressing bracket configured to suppress rotational movement with respect to the moving direction of the piston part.

A vehicle height adjustment system includes: an input housing part having a space in which working fluid is stored; an input piston part positioned in the input housing part, the input piston part configured to move along a lengthwise direction of the input housing part; a lead screw inserted into the input piston part, the lead screw configured to move in response to receiving external power; and a connection part fastening the input piston part with the lead screw.