Abstract: A method of setting control data by an active vibration isolation control system includes the steps of selecting, when a frequency of a pulse signal actually detected is superior to a predetermined frequency, appropriate control data selected from among predetermined data maps incorporating control data capable of securing, in accordance with various vehicle driving conditions respectively, a control condition in which operation of the vibrator is preferably controlled, calculating a deviation between the appropriate control data commensurate with the actual vehicle driving condition at the time of controlling and actually detected data representing vibration subjected to a vehicle specific position, the actually detected data obtained in terms of a same physics amount as a physics amount of the control data, and modifying the appropriate control data on the basis of the calculated deviation.

Abstract: A vibration controller includes a map controller, an adaptive controller, a set-up frequency judge/switcher, and an actuator. The map controller includes a data map storage for storing data on control signals determined in advance for a vibration insulator, and a signal generator for selecting one of the data, depending on a frequency of a cyclically pulsating signal emitted from a vibration generating source of a vehicle, from the data map storage and generating a control signal. The adaptive controller generates the control signal with respect to the cyclically pulsating signal using an adaptive control method. The set-up frequency judge/switcher switches from the map controller to the adaptive controller or vice versa based on the frequency of the cyclically pulsating signal. The actuator actuates an actuator of the vibration insulator based on the control signal generated by the map controller or the adaptive controller, whereby inhibiting the vehicle from vibrating.

Abstract: A fluid filled type vibration-damping device including: an elastic body connecting a first and second mounting member and sealing off one opening of the second mounting member; a flexible film fluid-tightly sealing off an another opening of the second mounting member; a partition member firmly fitted into the second mounting member thereby forming a pressure-receiving chamber partially defined by the rubber elastic body and an equilibrium chamber partially defined by the flexible film, which communicate together via an orifice passage; a short circuit passage is formed to connect the two chambers, and a valve body placing the short circuit passage in a communicating state on a basis of elastic deformation of the elastic body when an excessive pressure differential arises between the two chambers.

Abstract: A Fluid-filled type vibration damping device, which is configured to be free from the necessity of supplying a continuous application of electricity to a coil so as to maintain a movable valve body in either an opened state or a closed state, is provided. The device includes a cam mechanism, which transmits a rotational drive force of a motor to the movable valve body in the form of a reciprocating drive force. In the device, a first rotation angle switch is connected to a first control switch in series relative to a motor coil, and a second rotation angle switch is connected to a second control switch in parallel relative to the first switch. The first rotation angle switch is turned on in a state of a first angular range ?1, and the second rotation angle switch is turned on in a third angular range ?3. When the first control switch and the second control switch receive the same control signal, they are brought into respective inverted ON/OFF states.

Abstract: A fluid-filled type vibration damping device including: a primary fluid chamber partially constituted by a main rubber elastic body connecting a first and second mounting member; an equilibrium chamber partially constituted by a flexible film; a partition member supported by the second mounting member; and a partition rubber film is superimposed against the partition member and secured interlocking with an annular interlocking projection projecting from the partition member. A first seal rubber is compressed between the interlocking projection and the tubular fitting member and extending about the entire circumference, thereby forming a working air chamber therebetween. A gap is furnished between and a second seal rubber is compressed between the tubular fitting member and the orifice member, and extending about the entire circumference.

Abstract: A vibration damping device including a hollow housing having a fastening frame and a housing main body attached to the fastening frame for providing the hollow housing enclosing a mass member. With the housing main body inserted between top and base plate portions through an opening in the fastening frame, an urging force of a first spring projection is directed against the housing main body from one of the top base plate portions towards the other thereby holding the housing main body pressed against the other of the top and base plate portions, while an urging force of a second spring projection is directed against the housing main body towards the opening side from a back plate portion causing the housing main body to become engaged by a catch projection, for attaching the housing main body to the fastening frame and preventing it from slipping out through the opening of the fastening frame.

Abstract: A fluid filled type vibration damping device includes a first mounting member, a second mounting member, a main rubber elastic body, a flexible film, a partition member, a valve, a coil, a control-signals-generating circuit and a power amplifier circuit. The valve enables to switch the second orifice passage between an open state and a closed state. The second orifice passage communicates the pressure-receiving chamber and the equilibrium chamber with each other. The switch of the valve is performed by an electromagnetic force occurring by an electrical connection of the coil. Furthermore the control-signals-generating circuit is formed and disposed separately from the coil. The control-signals-generating circuit produces state switching control signals of the valve.

Abstract: A vibration damping device wherein a stopper rubber disposed between opposing faces of a first mounting member and the retainer member so as to project from one of the opposing faces to the other. When the first and second mounting members undergoes relative displacement axially towards each other, a shock produced at a time when an abutting face of the first mounting member comes into contact with the open end face, i.e., an abutting face of the retainer member absorbed by the stopper rubber coming into contact with the other one of the opposing faces until the first mounting member comes into contact with the open end face of the retainer member. A receiving space is disposed between the opposing faces of the first mounting member and the retainer member so that the stopper rubber is accommodated in an elastically compressive-deformed state within the receiving space when the abutting faces contact together.

Abstract: A fluid-filled type vibration-damping device wherein first and second mounting members are connected by a main rubber elastic body defining a pressure receiving chamber connected via an orifice passage to an equilibrium chamber defined by a flexible diaphragm. A partition member dividing both chambers is elastically supported by the second mounting member such that an outer rim of the partition member is pinched between a first support rubber elastic body and a second support rubber elastic body, while being spaced away radially inwardly from the second mounting member, whereby the partition member is displaceable relative to the second mounting member due to elastic deformation of the first and second elastic support bodies to provide a fluid pressure absorbing mechanism to check pressure fluctuation in the pressure receiving chamber to the equilibrium chamber.

Abstract: A fluid-filled type vibration-damping device having an elastic rubber film partially defining a primary fluid chamber at one surface and partially defining a pressure action chamber. The pressure action chamber varies its pressure under control so that the elastic rubber film changes its elasticity to change damping characteristics of the device. To give sufficient recovery force for the elastic rubber film, the elastic rubber film includes a plurality of thick reinforcing ribs circumferentially spaced apart from one another and extending in a radial direction from an outside peripheral edge over a length not reaching a center so that areas situated between pairs of adjacent reinforcing ribs constitutes thin portions formed by a thin rubber elastic body, while the center portion of the elastic rubber film situated between distal ends constitutes a bowed center portion thinner than the reinforcing ribs and convex towards the pressure action chamber.

Abstract: A fluid-filled type vibration-damping device having a movable rubber plate housed within a partition member partitioning a pressure-receiving chamber and an equilibrium chamber from each other. The movable rubber plate is moved owing to the pressure difference between the two chambers. The movable rubber plate comprises the movable rubber plate formed of a generally disk shaped rubber elastic body having formed thereon in alternating fashion concave grooves and convex ribs each extending in a circumferential direction about a same center axis, the convex ribs have tapered cross section gradually narrowing in width towards an distal end thereof, and the concave grooves and convex ribs are disposed at the same locations in a diametrical direction on either face of the movable rubber plate so that the thickness of the movable rubber plate is varied in the circumferential direction.

Abstract: An active vibration damper having: an electromagnetic oscillator with a coil member and a yoke member, one of the coil member and yoke member of the electromagnetic oscillator being fixed to a target member whose vibration to be damped while the other being elastically supported by the target member via a support rubber elastic body; and a base member having a cylindrical peripheral wall portion and a floor portion, and fixed to the target member. The support rubber elastic body is housed within the base member, and the electromagnetic oscillator is disposed outside of the base member, on an opposite side of the support rubber elastic body with the floor portion of the base member being interposed. An insertion hole is formed at the floor portion of the base member, and the other of the coil and yoke member forms a coupling rod inserted through the insertion hole and fixed to a center portion of the support rubber elastic body.

Abstract: A series-type engine mount provided in a selectively combined arrangement (B-1), (B-2) or (B-3), with an mount body (A). (A) A fluid-filled mount body has an elastic body connecting a first and second mounting member; a pressure receiving chamber defined by the elastic body; an equilibrium chamber defined by a flexible layer; a first orifice passage connection the pressure receiving and equilibrium chambers; a medial chamber; a second orifice passage connecting the medial and equilibrium chambers; a pressure fluctuation transmitting mechanism; a pressure regulating rubber plate; an air chamber; and an air passage connected to the air chamber with a port. (B-1) The port is open to an atmosphere to expose the air chamber to atmosphere. (B-2) The port is connected alternatively to atmosphere and vacuum via a static pressure switching valve. (B-3) The port is cyclically switched between connection to atmosphere and vacuum via a dynamic pressure switching valve.

Abstract: Disclosed is a method of producing an impact-type cylindrical vibration-damping device comprising the steps of: preparing a main rubber elastic body of hollow cylindrical shape including a mass installation groove open in an outer circumferential surface thereof and a slit extending over an entire axial length thereof; expanding the elastic body at the slit in order to mount the elastic body about a rod shaped vibrating member through the slit from a radially outer side such that the elastic body has an abutting inner surface adapted to come into abutting contact against the vibrating member at a portion where a radial distance between an inner circumferential surface of the elastic body and an outer circumferential surface of the vibrating member is smallest; preparing a mass member separately from the elastic body; and fixing the mass member to the elastic body by fitting the mass member onto the mass installation groove.

Abstract: A fluid-filled vibration damping device including: an elastic body connecting a first and a second mounting member, defining a pressure receiving chamber undergoing pressure fluctuation during input of vibration; an equilibrium chamber defined by a flexible layer for permitting its volume change; an orifice passage connecting the pressure receiving chamber and equilibrium chamber; a movable member; and a short passage for connecting two chambers with a length smaller than that of the orifice passage. When pressure in the pressure-receiving chamber increases, the movable member is displaced or deformed toward to close the equilibrium-chamber-side opening of the short passage to have the short passage substantially closed, while when pressure in the pressure-receiving chamber decreases, the movable member is displaced or deformed to have the short passage operative.

Abstract: An active vibration damper including: an electric-type linear actuator having a stator, a movable member; a coil arranged in one of the stator and the movable member; a mounting member to which the stator is fixed; a mass member incorporating the movable member; an elastic connecting rubber connecting the mass member to the stator, and being disposed such that the linear actuator is disposed on one side thereof so that the mass member is oscillated by means of driving force applied to the movable member of the linear actuator; a cover member firmly fixed to the mounting member for providing a hermetic accommodation space having a first air chamber and a second air chamber formed on both sides of the elastic connecting rubber; and an air channel through which the first and the second air chambers are communicated.

Abstract: A fluid filled type vibration damping device includes: a main rubber elastic body elastically connecting first and second mounting members; a partition member supported by the second mounting member; a pressure-receiving chamber partially defined by the elastic body and having a non-compressible fluid sealed therein; an equilibrium chamber partially defined by a flexible film and having the non-compressible fluid therein. The chambers are formed to either side of the partition member and an orifice passage permits a fluid communication between the two chambers. A short-circuit passage is formed so that the pressure-receiving and equilibrium chambers are able to be short-circuited through the short-circuit passage. A valve is used for switching the short-circuit passage, and a metal spring is used for holding the valve in a closed state at a predetermined initial level of elastic deformation.

Abstract: A vibration damping device for use in an internal combustion engine including: a rigid housing having a hollow space; an independent mass member housed within the hollow space; and at least one rubber sleeve being independent of the housing and the mass member and being disposed within an empty space between the housing and the mass member so as to extend over an entire circumference of the empty space with a constant thickness dimension. An inside tiny gap is formed between an inner circumferential surface of the rubber sleeve and an outer surface of the mass member over an entire circumference thereof, while an outside tiny gap is formed between an outer circumferential surface of the rubber sleeve and an inner surface of the housing over an entire circumference thereof at room temperature of 25° C.

Abstract: An adaptive controller includes an adaptive-signal generator for generating an adaptive signal, which includes a first amplitude filter coefficient and a first phase filter coefficient, in a first transfer path based on an angular frequency of a cyclic signal, which a vibration generation source generates; a first residual-error detector for detecting a first residual error at a first observation point in the first transfer path; an observation-point target-value setter for setting a residual-error target value, which includes an amplitude target value complying with the angular frequency; and a first filter-coefficient updater for updating the first amplitude filter coefficient and the first phase filter coefficient based on the angular frequency, the first residual error and the residual-error target value. Thus, when adding the adaptive signal to the cyclic signal, the adaptive controller can make the residual error, which results from the addition, not equal to zero intentionally.

Abstract: A fluid-filled active damping apparatus having a pressure receiving chamber partially defined by a rubber elastic body connecting a first and second mounting member; an oscillation plate defining a part of the pressure receiving chamber, and supported in a displaceable fashion; an electromagnetic actuator disposed on one side of the oscillation plate remote from the pressure receiving chamber, with its output member connected to the oscillation plate; an equilibrium chamber partially defined by a flexible diaphragm; and an orifice passage connecting the pressure receiving chamber and equilibrium chamber. A rigid annular guide member is disposed about the oscillation plate with a slight gap therebetween, such that these members are mutually displaceable in the axial direction. The guide member is elastically supported by and connected to the second mounting member via an elastic support member.