Vehicle cab suspension damping bushing and method of making

A radial damped bushing for damping motion about an axis, said bushing comprised of a nonelastomeric outer member having an outer member center bore with an outer member center axis, a nonelastomeric inner member having an inner member center axis, said inner member center axis offset from said outer member center axis, said inner member including a plurality of radial paddles extending radially outward towards said outer member, an intermediate elastomer, said intermediate elastomer disposed between said inner member and said outer member and constraining a viscous fluid around said radial paddles, wherein a supported load applied to said inner member substantially centers said inner member center axis with said outer member center axis and a motion of said inner member relative to said outer member paddles said viscous fluid with said radial paddles.

A method of making a vehicle suspension damping bushing for damping motion about an vehicle suspension axis, said method comprising:

• providing a nonelastomeric rigid outer ductile tubular member having an outer member center bore with an outer member center axis, providing a nonelastomeric rigid inner member having an inner member center bore with an inner member center axis, said inner member including a plurality of radial paddles extending radially outward, providing a first intermediate sidewall elastomer and a second intermediate sidewall elastomer, providing a viscous fluid, disposing said first intermediate sidewall elastomer and said second intermediate sidewall elastomer between said inner member and said outer member to form a cavity for constraining said viscous fluid around said inner member radial paddles with said inner member radial paddles extending radially outward towards said outer member, wherein a supported load applied to said inner member substantially centers said inner member center axis with said outer member center axis and a motion of said inner member relative to said outer member paddles said viscous fluid in said cavity with said radial paddles .

A method of making a damped bushing for damping motion about an axis, said method comprising:

• providing a nonelastomeric rigid outer member having an outer member center bore with an outer member center axis, providing a nonelastomeric rigid inner member having an inner member center axis, said inner member including a plurality of radial paddles extending radially outward, providing a viscous fluid, disposing an intermediate elastomer between said inner member and said outer member with said intermediate elastomer constraining said viscous fluid around said inner member radial paddles, wherein a motion of said inner member relative to said outer member paddles said viscous fluid with said radial paddles.

A method of making a damped bushing for damping motion, said method comprising:

• providing a nonelastomeric rigid bushing outer member having an outer member center bore, providing a nonelastomeric rigid bushing inner member including a plurality of radial paddles extending radially outward from a center axis, providing a viscous fluid having a viscosity greater than 4,000 centistokes, disposing an intermediate elastomer between said bushing inner member and said bushing outer member with said viscous fluid contained around said bushing inner member radial paddles, wherein an input motion of said bushing inner member relative to said bushing outer member paddles said viscous fluid with said damped bushing providing a damping tan delta >0.25 above 6.0 Hz at ±1.0 mm input.