초록 ▼

An active suspension system for a work vehicle is disclosed herein. The system includes an active vibration isolator mounted between the chassis and cab of the vehicle. The isolator includes mounts attached to the cab and the chassis, and a spring and a hydraulic actuator are connected between the m

An active suspension system for a work vehicle is disclosed herein. The system includes an active vibration isolator mounted between the chassis and cab of the vehicle. The isolator includes mounts attached to the cab and the chassis, and a spring and a hydraulic actuator are connected between the mounts. The actuator includes a cylinder and a piston moveable therein. An elastomeric vibration isolator is connected in series with the actuator to damp high frequency vibrations. The actuator moves the cab relative to the chassis when pressurized hydraulic fluid is selectively supplied and relieved to the actuator by a valve assembly responsive to a valve control signal. A sensor measures movement between the piston and the chassis. The sensor is located coaxial to the piston on an external surface of the isolator for ready access. A control circuit generates the valve control signal in response to the sensed signal to attenuate transmission of force between the cab and chassis. The movement sensor may also be mounted near the operator to directly sense vibrations affecting the operator. The isolator may be mounted sideways to reduce or eliminate the need for the spring.

대표청구항 ▼

[ What is claimed is:] [1.] An active suspension system for a work vehicle, the work vehicle including a chassis, an operator's cab disposed above the chassis, and a source of pressurized hydraulic fluid supported by the chassis, comprising:at least one active vibration isolator coupled between the

[ What is claimed is:] [1.] An active suspension system for a work vehicle, the work vehicle including a chassis, an operator's cab disposed above the chassis, and a source of pressurized hydraulic fluid supported by the chassis, comprising:at least one active vibration isolator coupled between the cab and the chassis,- including:first and second mounts adapted to attach between the cab and the chassis, respectively, the first mount having a first side for attachment to the cab and a second side opposite the first side;a hydraulic actuator connected between the first and the second mounts and including a cylinder and a piston moveable with respect to the cylinder;an elastomeric vibration isolator connected in series with the actuator and located at least partially between the first and the second mounts;a valve assembly coupled between the source of pressurized hydraulic fluid and the actuator, the valve assembly configured to selectively supply and relieve fluid to the actuator in response to a valve control signal to cause the piston to move in a given direction relative to the cylinder; anda movement sensor configured to generate a signal indicative of movement in the given direction between the piston and the chassis, the movement sensor mounted at a location coaxial to the piston and on the first side of the first mount; anda control circuit coupled to the active vibration isolator and configured to generate the valve control signal in response to the movement signal to attenuate transmission of force between the cab and the chassis.