An air spring includes a closing member, a rolling piston, and an air spring bellows connected to the rolling piston and the closing member to form a fluid-filled pressure chamber. A level control system for supplying and/or discharging fluid may be integrated into the pressure chamber to control level position based on air spring stroke. The level control system may have a control valve and an actuator connected to the control valve. The actuator may include a guide tube coupled to the rolling piston or closing member, and movably arranged within the pressure chamber. An actuating member may include a pin member and may operate the control valve. A compression spring may have a central spring and a biasing spring, and the guide tube may include a control flange coupled to the pin member, and the biasing spring may be supported to press the pin member against the control valve.

A load isolation device, or suspension assembly of a vehicle, including a damping air spring and a pneumatic control system. The damping air spring is operatively connected to a structure to be isolated and extends from a base operatively connected to or operatively disposed on a source of vibration. The pneumatic control system includes a height control valve connected to the damping air spring and is capable of being actuated between a first operating state and a second operating state. The height control valve enables the damping air spring to maintain the structure at a primary height in the first operating state and at a secondary height different from the primary height in the second operating state.

Assembly in a compressed air system of a vehicle provided with an air ride suspension, the assembly being configured to lift the vehicle body by filling at least one air spring, the solenoid valves being switchable in cooperation with an electronic control device, and the assembly including a pressure line for filling the air springs, and the pressure line including a first branch line connectable to the pressure line via a pilot-controlled solenoid valve for filling the air springs and including first supply pipes and pilot-controlled solenoid valves for each air spring as well as a second branch line for providing a control pressure which includes second supply pipes for the pilot-controlled solenoid valves, wherein the second branch line is connected to the pressure line via a check valve, the check valve providing a block position against venting or pressure drop in the second branch line.

An air suspension system includes a tank, a tank-side open/close valve, an air suspension-side open/close valve, a system portion, and the like. The system portion includes a compressor, an air drier, and a first passage and a second passage provided between the tank-side open/close valve and the air suspension-side open/close valve in parallel, a discharge valve, a tank-side control valve, an air suspension-side control valve, and the like. Due to this configuration, the air suspension system regenerates the air drier by opening the discharge valve to thus cause the air in the second passage to flow from an opposite side toward one side of the air drier when no power is supplied to the tank-side control valve and the air suspension-side control valve.

A pneumatic suspension system for a vehicle, in which the pneumatic suspension system includes a supply tank, a first set of air springs positioned on a first side of the vehicle; a second set of air springs positioned on a second side of the vehicle, and a dual-action dynamic valve positioned between the first set of air springs and the second set of air springs. The dual-action dynamic valve is connected to the supply tank, the first set of air springs, and the second set of air springs by a series of air hoses. The dual-action dynamic valve is adapted to supply air to either one of the first set of air springs or the second set of air springs while simultaneously exhausting air from the other one of the first set of air springs or the second set of air springs.

An air suspension system includes air suspensions (1, 2) performing vehicle height adjustment in response to supply and discharge of air, a compressor (3) compressing air, a tank (4) storing compressed air, a first passage (6) connecting between the delivery side of the compressor and the tank, and a second passage (7) connecting between the delivery side of the compressor and the air suspensions. A first dryer (10) is provided in the middle of the first passage to dry air flowing through the first passage. A second dryer (11) is provided in the middle of the second passage to dry air flowing through the second passage. Thus, compressed air generated from ambient air sucked in by the compressor can be dried by the second dryer and supplied directly into the air chambers of the air suspensions.

A vehicle height adjustment device includes a spring having one end supported on a vehicle body side and another end supported on a wheel side. An adjustor includes an accommodation chamber accommodating fluid and adjusts a length of the spring in accordance with an amount of fluid in the accommodation chamber. A storage chamber stores fluid. A guide passage guides fluid from the accommodation chamber to the storage chamber. An actuator includes an operation rod to press a push rod. A valve body closes the guide passage when seated on a seat and opens the guide passage when pressed and detached from the seat by the push rod. A press member includes a contact portion and a shaft. The press member presses and seats the valve body on the seat. An accommodation member accommodates the valve body and the contact portion. A support member supports the shaft movably.

Disclosed herein is a pneumatic adjustment apparatus for a vehicle. The pneumatic adjustment apparatus includes a block including a flow path formed therein, the flow path being configured for a fluid to move through the block, a compressor coupled to the block and configured to communicate with the flow path and to compress the fluid, a driver coupled to the block, connected to the compressor, and configured to drive the compressor, and a controller coupled to the block and configured to open and close the flow path.

A hydraulic suspension apparatus configured to adjust a height of a vehicle body of a vehicle, includes a liquid storage apparatus and a reducer. The liquid storage apparatus is disposed on the vehicle body and configured to store liquid. The reducer has a reducer housing, a piston, and a piston rod. The reducer housing is connected to an axle, and the piston is located in the reducer housing and divides the reducer housing into an upper chamber and a lower chamber. An end of the piston rod is connected to the piston, and the piston rod is connected to the vehicle body and includes a liquid channel. The liquid channel is communicated with the lower chamber and the liquid storage apparatus to enable liquid flowable between the liquid storage apparatus and the lower chamber.

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.