An independent suspension system includes two suspension oil cylinders, respectively arranged between wheels at two sides and a frame: and a steering mechanism, configured to be driven by a steering booster oil cylinder to drive the wheels at two sides to turn. The independent system also includes two swing links arranged corresponding to the wheels at two sides, an end at one side of each of the swing links is hinged to a wheel hub of the wheel at the corresponding side via a spherical hinge, and an end at another side of each of the swing links is hinged to a fixing member fixed below a main speed reducer via two spherical hinges respectively along a fore-and-aft direction. A crane having the independent suspension system is further provided.

A crane for lifting and transporting loads includes a base frame, for transferring the loads of the crane onto a support surface by a plurality of wheels having two steering wheels; and a steering system. The steering system includes a linear steering actuator, which is hinged, on one side, to the base frame and, on the other side, to a bar having two ends. Each end of the bar is hinged to a respective rotary element around a respective hinging axis. Each rotary element rotates around a respective rotation axis and is constrained in rotation to the respective steering wheel to steer it.

A fluid suspension system for a land vehicle is provided with an actuator connected to a chassis and an axle of a land vehicle spaced apart from a pivotal connection of the axle. A fluid pressure circuit is in cooperation with the at least one actuator. A controller is in operable communication with the fluid pressure circuit and is programmed to receive input indicative of a travel speed of the land vehicle. The fluid pressure circuit is adjusted to limit fluid flow rate or reduce fluid pressure at a low speed travel range to permit the axle to pivot in response to variations in an underlying support surface. The fluid pressure circuit is adjusted at a higher speed travel range for selective actuation of the at least one actuator or for a higher fluid pressure actuation of the at least one actuator, in response to variations in the underlying surface.

A suspension system for a land vehicle is provided with at least one actuator connected to a chassis and an axle of a land vehicle spaced apart from a pivotal connection of the axle. A suspension circuit is in cooperation with the at least one actuator. A controller is in operable communication with the suspension circuit and is programmed to receive input indicative of a travel speed of the land vehicle. The suspension circuit is closed at a low speed travel range to permit the axle to pivot in response to variations in an underlying support surface. The suspension circuit is opened to permit selective actuation of the at least one actuator at a higher speed travel range in response to variations in the underlying support surface.

A crane for lifting and transporting loads includes a base frame for transferring the loads of the crane onto a support surface by a plurality of wheels. The wheels are capable of rotating relative to the base frame so as to change the camber angle of the wheels.

A crane, in particular a pick and carry crane, may have a front chassis with front wheels and a back chassis with back wheels, the front chassis being articulated relative to the back chassis so that the crane can travel whilst carrying a load suspended from a boom. The back and front wheels have independent suspensions which are capable of connection to one another so that movement of a left wheel influences movement of a right wheel, thereby improving the handing of the crane, particularly over rough terrain.

A leveling system for a lift device includes an axle, a pin, a cradle, and a chassis. The axle is configured to rotatably couple with one or more tractive elements. The pin extends through a bore of the axle. The cradle is pivotally coupled with the pin. The chassis is pivotally coupled with the pin and includes a first actuator and a second actuator. The first actuator and the second actuator each include a body and a rod configured to extend relative to the body. The rods of the first actuator and the second actuator are configured to be extended to engage corresponding surfaces on opposite sides of the cradle. The cradle and the chassis are configured to rock in unison a limited angular amount relative to the axle.

A crane for lifting and transporting loads includes a handling element, for supporting and handling the loads, and a chassis for transferring the loads of the crane onto a support surface by a contact arranged in contact with the surface, such as wheels. A drive transmission, such as a drive wheel, moves the crane on the support surface. The drive transmission is capable of translating relative to the chassis to adjust the force exerted by the drive transmission upon the support surface. The crane includes a sensor for detecting the force exerted by the drive transmission upon the support surface; and a control unit configured for adjusting the position of the drive transmission relative to the chassis, based on the detection of the sensor.

Disclosed is a mobile articulated crane having a boom for carrying a load when the crane is stationary and while the crane is mobile. The boom has an end for engaging with a load and an opposed end. The crane further comprises a counterweight attached to the boom at or close to the opposed end of the boom. A rear body of the crane can comprise first and second rear axles, each for supporting the rear body on the ground. The first rear axle can be arranged to be displaced relative to the second rear axle such that wheels of the first rear axle selectively engage or disengage with the ground.

A crane, in particular a pick and carry crane, may have a front chassis with front wheels and a back chassis with back wheels, the front chassis being articulated relative to the back chassis so that the crane can travel whilst carrying a load suspended from a boom. The back and front wheels have independent suspensions which are capable of connection to one another so that movement of a left wheel influences movement of a right wheel, thereby improving the handing of the crane, particularly over rough terrain.