In one embodiment, a suspension system for a vehicle cab, the suspension system comprising: a structural assembly; a cab mounted to the structural assembly; and plural suspension units arranged between the cab and the structural assembly, the plural suspension units comprising, fore and aft, a first pair of suspension units and a second pair of suspension units, wherein a lateral distance between the second pair of suspension units is greater than a lateral distance between the first pair of suspension units.

A hydraulic excavator includes a revolving frame forming a support structure, a cab that is disposed to be positioned on a front side of the revolving frame and in which an operator gets, and a plurality of vibration isolating members that are disposed between the revolving frame and the cab to support the cab on the revolving frame in a vibration isolating state. Further, an intermediate connecting member is disposed for connection between the revolving frame and the vibration isolating member and for a height position adjustment of the cab to the revolving frame. The intermediate connecting member is fixed to the revolving frame from a lower side.

In one embodiment, a method comprising dampening movement of a cab supported by a chassis according to at least one dampening component; receiving plural inputs from at least one sensor and a seat suspension system; and based on the received plural inputs, causing an adjustment to the dampening movement of the cab according to the at least one dampening component.

A vibration dampening system for a work vehicle may include a chassis frame extending lengthwise between a front end and a rear end. The chassis frame may include a first sidewall extending lengthwise along a first side of the frame between the front and rear ends and a second sidewall extending lengthwise along a second side of the frame between the front and rear ends. The system may also include a cab frame supported relative to the chassis frame via a suspension assembly, and a vibration damper coupled between the opposed first and second sides of the chassis frame. The vibration damper may extend lengthwise between a first end coupled to the first sidewall and a second end coupled to the second sidewall. The vibration damper is configured to reduce an amount of vibrations being transmitted through the chassis frame to the cab frame via the suspension assembly.

A vibration dampening system for a work vehicle may include a chassis frame, a cab frame, and a suspension assembly coupled between the frames. The suspension assembly may include a superstructure having at least two mounting interfaces for coupling the cab frame to the superstructure and at least one support structure extending at least partially between the mounting interfaces. The support structure(s) include a first end portion, a second end portion opposite the first end portion, and a connector portion extending between the first and second end portions. In addition, the system includes an elastomeric vibration damper provided in association with the connector portion of the support structure(s) such that the vibration damper extends along an outer surface of the support structure(s) along at least a portion of the length of the connector portion. The elastomeric vibration damper is configured to reduce vibrations transmitted through the support structure(s).

A vibration dampening system for a work vehicle may include a cab frame having a plurality of structural frame members, with the structural frame members including a first frame member extending along a first side of the cab frame and a second frame member extending along a second side of the cab frame. The second side is opposite the first side. In addition, the system may include a vibration damper coupled between the first and second frame members. The vibration damper may extend lengthwise between a first end coupled to the first frame member and a second end coupled to the second frame member. The vibration damper is configured to reduce an amount of vibrations being transmitted through the cab frame.

Vehicle cab suspension control systems are disclosed herein. In some embodiments, the cab suspension control systems can include front cab-to-frame mounts that include controllable elastomer-based isolators that can provide real time variable damping to improve ride quality and/or road holding and reduce cab roll in response to, for example, input from one or more cab and/or frame mounted accelerometers, position sensors, etc. Embodiments of the control systems described herein can utilize a single vehicle controller (e.g., an ECU) to control all of the cab suspension components (e.g., semi-active damping technologies, air spring technologies, etc.) employed on a vehicle to provide a single suspension control solution that can provide improved ride performance, road holding, etc.

A suspension system includes a hydraulic cylinder having a piston chamber in which a piston moves and a rod chamber in which a rod moves. The hydraulic cylinder operably moves between a retraction and an extension. The system also includes a throttle valve, a branching, and a hydraulic reservoir fluidly coupled to the hydraulic cylinder. A fluid flow from the piston chamber is divided at the branching into a first fluid flow portion and a second fluid flow portion. The first fluid flow portion flows to the rod chamber of the hydraulic cylinder, and the second fluid flow portion flows through the throttle valve to the hydraulic reservoir.

A cabin suspension arrangement for a utility vehicle, having a plurality of trailing arms that extend in a longitudinal direction, by which a driver's cabin is mounted and can pivoted relative to a vehicle frame. Two of the trailing arms are arranged spaced apart from one another in a transverse direction that extends perpendicularly to the longitudinal direction, are connected to one another by a torsion bar spring that extends in the transverse direction, and are arranged at the same height in a vertical direction perpendicular to the longitudinal direction and to the transverse direction, thereby forming a first trailing arm pair. Two other trailing arms are arranged spaced apart from one another in the transverse direction, are arranged at the same height in the vertical direction, and thereby form a second trailing arm pair, which is spaced apart, in the vertical direction, from the first trailing arm pair.

Vehicle cab suspension control systems are disclosed herein. In some embodiments, the cab suspension control systems can include front cab-to-frame mounts that include controllable elastomer-based isolators that can provide real time variable damping to improve ride quality and/or road holding and reduce cab roll in response to, for example, input from one or more cab and/or frame mounted accelerometers, position sensors, etc. Embodiments of the control systems described herein can utilize a single vehicle controller (e.g., an ECU) to control all of the cab suspension components (e.g., semi-active damping technologies, air spring technologies, etc.) employed on a vehicle to provide a single suspension control solution that can provide improved ride performance, road holding, etc.