초록 ▼

A noise and vibration attenuating support mounts a rotating member that tends to tilt about and translate along axes transverse to its axis of rotation. The support incorporates a body having mass and a moment of inertia with respect to an axis through the center of gravity of the body. Resilient el

A noise and vibration attenuating support mounts a rotating member that tends to tilt about and translate along axes transverse to its axis of rotation. The support incorporates a body having mass and a moment of inertia with respect to an axis through the center of gravity of the body. Resilient elements, which are secured to the mass body, mount the rotating member resiliently relative to the mass body and the mass body resiliently relative to a second member. When mounting the rotating member, the support circumscribes and is coupled to the member such that the center of gravity of the rotating member is spaced along the axis of rotation from the center of gravity of the mass body. The support also predominately determines a translational natural mode of vibration with an associated natural frequency at which the mass body translates in resonance along axes transverse to the axis of rotation of the rotating member. Similarly, the support predominately determines a cocking natural mode of vibration with an associated natural frequency at which the mass body cocks or tilts in resonance about axes transverse to the axis of rotation of the rotating member. To reduce the transmission of vibrations from the rotating member to the second member, the mass and moment of inertia of the mass body and the stiffnesses of the resilient elements are such that the natural frequencies of the translational and cocking modes of vibration both fall outside of a frequency range corresponding to a predetermined normal rotational speed range of the rotating member. In addition, at least one of the natural frequencies falls below the frequency range corresponding to the predetermined rotational speed range of the rotating member.

대표청구항 ▼

A support for mounting a rotating first member on a second member and for reducing the transmission of vibrations from said rotating first member to said second member, the first member being rotatable about an axis and tending while rotating to tilt about and translate along axes transverse to said

A support for mounting a rotating first member on a second member and for reducing the transmission of vibrations from said rotating first member to said second member, the first member being rotatable about an axis and tending while rotating to tilt about and translate along axes transverse to said axis of rotation, the first member also normally being rotated at a speed within a predetermined range of rotational speeds, said support comprising: a. a body having mass and a moment of inertia with respect to an axis passing through the center of gravity of the mass body transverse to said axis of rotation, the mass body also having formed in it an opening; b. means secured to the mass body for mounting the first member resiliently relative to the mass body; and c. means secured to the mass body for mounting the mass body resiliently relative to the second member, the support being dimensioned and configured to circumscribe the first member and its axis of rotation and to be coupled to the first member such that the first member, when mounted in the support, extends into the opening in the mass body and has a center of gravity which is spaced along the axis of rotation from the center of gravity of the mass body, the support, when mounting the first member, predominately determining (i) a translational natural mode of vibration with an associated natural frequency at which the mass body translates in resonance along axes transverse to the axis of rotation of the first member and (ii) a cocking natural mode of vibration with an associated natural frequency at which the mass body cocks or tilts in resonance about axes transverse to the axis of rotation of the first member, the mass and moment of inertia of the mass body and the stiffnesses of the mounting means being such that both of said natural frequencies of the translational and cocking modes of vibration fall outside of a frequency range corresponding to the predetermined rotational speed range of the first member and such that at least one of said natural frequencies falls below the frequency range corresponding to the predetermined rotational speed range of the first member.