The present invention relates to an improved control system of the trim of motorcycles with more than two wheels. More in particular, it relates to motorcycles which have at least three wheels and can lean sideways by virtue of the presence of a so-called wheel tilting system. The present invention improves on prior art HTS hydro-pneumatic systems, to improve the vehicle trim, particularly while cornering with the leaned vehicle.

A vehicle suspension is disclosed having a hydraulic actuator, a cylinder, a piston mounted inside the cylinder dividing the cylinder into a compression chamber and an extension chamber, and a supply hydraulic circuit connected to the actuator to supply the compression chamber and the extension chamber with working fluid. The supply hydraulic circuit includes a high-pressure line connected to a delivery port of a hydraulic pump, a low-pressure line connected to a suction port of the pump, a spool valve connected to the compression and extension chambers of the actuator and to the high-pressure line and to the low-pressure line to put the chambers of the actuator in communication with the lines of the supply hydraulic circuit, and a first pressure accumulator connected to the high-pressure line. The spool valve connects the compression chamber and/or the extension chamber of the actuator with the high-pressure line.

A vehicle suspension is disclosed having a hydraulic actuator, a cylinder, a piston mounted inside the cylinder dividing the cylinder into a compression chamber and an extension chamber, and a supply hydraulic circuit connected to the actuator to supply the compression chamber and the extension chamber with working fluid. The supply hydraulic circuit includes a high-pressure line connected to a delivery port of a hydraulic pump, a low-pressure line connected to a suction port of the pump, a spool valve connected to the compression and extension chambers of the actuator and to the high-pressure line and to the low-pressure line to put the chambers of the actuator in communication with the lines of the supply hydraulic circuit, and a first pressure accumulator connected to the high-pressure line. The spool valve connects the compression chamber and/or the extension chamber of the actuator with the high-pressure line.

A damper assembly for a vehicle suspension system includes a primary damper and a secondary damper. The secondary damper includes a housing having a wall that at least partially surrounds at least a portion of the primary damper, the volume between the wall and the primary damper defining a chamber, and the wall defines an aperture. The secondary damper also includes a piston positioned within the chamber, a conduit defining a flow path that includes the aperture, and a valve disposed along the flow path. The secondary damper is configured to provide a damping force that varies based on the position of the piston within the chamber.

A damper assembly for a vehicle suspension system includes a primary damper and a secondary damper. The secondary damper includes a housing having a wall that at least partially surrounds at least a portion of the primary damper, the volume between the wall and the primary damper defining a chamber, and the wall defines an aperture. The secondary damper also includes a piston positioned within the chamber, a conduit defining a flow path that includes the aperture, and a valve disposed along the flow path. The secondary damper is configured to provide a damping force that varies based on the position of the piston within the chamber.

A vehicle reinforcing member includes first and second pistons movable in an axial direction in a cylinder. An inside of the cylinder is sectioned into a gas chamber and a main liquid chamber by the first piston, and the main liquid chamber is sectioned into a first sub-liquid chamber and a second sub-liquid chamber by the second piston. Gas is sealed in the gas chamber, and liquid is sealed in the first and second sub-liquid chambers. A piston rod is coupled to the second piston. The cylinder and the piston rod are respectively coupled to two locations of a vehicle body. A communication path connects the first sub-liquid chamber to the second sub-liquid chamber. A moving amount of the liquid in the communication path is adjusted by an adjuster such that a moving load through the second piston is adjusted.

A vehicle reinforcing member includes first and second pistons movable in an axial direction in a cylinder. An inside of the cylinder is sectioned into a gas chamber and a main liquid chamber by the first piston, and the main liquid chamber is sectioned into a first sub-liquid chamber and a second sub-liquid chamber by the second piston. Gas is sealed in the gas chamber, and liquid is sealed in the first and second sub-liquid chambers. A piston rod is coupled to the second piston. The cylinder and the piston rod are respectively coupled to two locations of a vehicle body. A communication path connects the first sub-liquid chamber to the second sub-liquid chamber. A moving amount of the liquid in the communication path is adjusted by an adjuster such that a moving load through the second piston is adjusted.

A wheel suspension system for a motor vehicle which includes a front axle having two front wheels, to each of which a front hydraulic cylinder is assigned, and a rear axle having two rear wheels, to each of which a rear hydraulic cylinder is assigned. The hydraulic cylinders in a hydraulic system are connected crosswise hydraulically. In order to implement active roll stabilization in a wheel suspension system, a hydraulic pump in the hydraulic system is connected hydraulically between the crosswise-connected hydraulic cylinders.

A wheel suspension system for a motor vehicle which includes a front axle having two front wheels, to each of which a front hydraulic cylinder is assigned, and a rear axle having two rear wheels, to each of which a rear hydraulic cylinder is assigned. The hydraulic cylinders in a hydraulic system are connected crosswise hydraulically. In order to implement active roll stabilization in a wheel suspension system, a hydraulic pump in the hydraulic system is connected hydraulically between the crosswise-connected hydraulic cylinders.

A hydraulic suspension system is provided for a vehicle, the system including at least a first hydraulic cylinder and a second hydraulic cylinder, each of the hydraulic cylinders including a first chamber and a second chamber, at least four hydraulic accumulators, and at least a first and a second fluid communication path. The first chamber of the first hydraulic cylinder, and the second chamber of the second hydraulic cylinder are in fluid communication with each other by means of the first fluid communication path, and the first chamber of the second hydraulic cylinder and the second chamber of the first hydraulic cylinder are in fluid communication with each other by means of the second fluid communication path, wherein a first hydraulic accumulator is in fluid communication with the first fluid communication path by means of a first accumulator fluid communication path and a second hydraulic accumulator is in fluid communication with the first fluid communication path by means of a second accumulator fluid communication path, wherein a connection point between the first accumulator fluid communication path and the first fluid communication path is distanced from a connection point between the second accumulator fluid communication path and the first fluid communication path, and wherein a third hydraulic accumulator is in fluid communication with the second fluid communication path by means of a third accumulator fluid communication path and a fourth hydraulic accumulator is in fluid communication with the second fluid communication path by means of a fourth accumulator fluid communication path, wherein a connection point between the third accumulator fluid communication path and the second fluid communication path is distanced from a connection point between the fourth accumulator fluid communication path and the second fluid communication path.