Abstract: A hydraulic bearing includes a support spring made of elastomeric material and a hydraulic volume partitioned into a work chamber and a compensating chamber. A partition wall is disposed between the two chambers and includes a transfer channel. For acoustic decoupling, a membrane-like decoupling element is seated and is displacement limited between two lattice plates. The decoupling element is made of flexible elastic material and is clamped laterally to be pressure tight. The decoupling membrane is radially prestressed for matching the acoustic decoupling to specific disturbing frequencies (hum frequencies). This prestressing takes place preferably because of the shrink process during vulcanization of the decoupling membrane which is made of raw rubber. The decoupling membrane can have a peripheral bead and at least one transverse strut. The strut can have a reinforcement insert.

Abstract: A vibration isolator assembly, such as an isolator bushing or cradle mount, includes a housing and an isolator connected to the housing. A shaft assembly includes first and second mating components, the first component being connected to the elastomer and having a cavity of a first dimension for receiving the second component having a different, second dimension therein. The differing dimensions alters the stress characteristics of the vibration isolator assembly. According to a preferred method of altering stress characteristics of a vibration isolator assembly, the method includes the steps of forming a cavity in the shaft and varying a dimension of the shaft to alter the spring rate characteristics. In the preferred arrangement, the shaft assembly includes a split, first component and a second component is inserted between the split portions to relieve tensile stress in the isolator and, if desired, to impart a compressive stress in the isolator.

Abstract: A vibration isolator assembly, such as an isolator bushing or cradle mount, includes a housing and an isolator connected to the housing. A shaft assembly includes first and second mating components, the first component being connected to the elastomer and having a cavity of a first dimension for receiving the second component having a different, second dimension therein. The differing dimensions alter the stress characteristics of the vibration isolator assembly. In the preferred arrangement, the shaft assembly includes a first component comprising first and second portions, a thin layer of elastomer interposed between the first and second components and a second component which is inserted between the portions to relieve tensile stress in the isolator and, if desired, to impart a compressive stress in the isolator. The thin layer of elastomer permits the first components to be made more economically.

Abstract: A dynamic damper for damping vibration of a rotary shaft. The dynamic damper includes a tubular mass member and a rubber elastic member. The rubber elastic member includes an attachment tube press-fitted onto the rotary shaft and an arm. The attachment tube is disposed coaxially with the mass member but nearer to an axial center thereof than the mass member. The arm connects the attachment tube to the mass member. The attachment tube includes a tubular support portion connected to the arm, a tubular attachment portion, and a tubular coupling portion for coupling the tubular support portion with the tubular attachment portion. The tubular attachment portion has larger interference than the tubular support portion.

Abstract: Disclosed is a fluid-filled active vibration damping device including: an elastic body; a primary fluid chamber partially defined by the elastic body; a movable member partially defining the primary fluid chamber on one side and a working air chamber on the other side; and a vacuum pump including an air intake port and an exhaust port, which are connectable to the working chamber via a valve mechanism. A fluid pressure variation in the primary fluid chamber can be actively controlled by transmitting an air pressure variation in the working air chamber to the primary fluid chamber via the movable member. A switching operation of the valve mechanism selectively applies a negative pressure generated in the air intake port and a positive pressure generated in the exhaust port to the working air chamber in order to generate the air pressure variation in the working air chamber.

Abstract: An intermediate bearing for a driveline of a commercial vehicle has a housing (7) with a stirrup-shaped cross-section. The housing (7) has a fixing face (12) formed of two straight portions (8, 9) and a first arched portion (10). A bearing member (15) is arranged between the portions (8, 9, 10). The bearing member (15) is rubber and is connected to the fixing face (12) by vulcanization. A locking element (23) bridges the space between the two straight portions (8, 9). The locking member (23) is attached to the bearing member (15). The bearing member (15) encloses a supporting ring (16) which serves to receive a rolling contact bearing. The locking element (23) is adjustable for the purpose of setting a pre-tension of the bearing member (15) towards the longitudinal axis (18) of the bore (17) of the supporting ring (16). The locking element (23) can be connected to the housing (7) after the required pre-tension has been set.

Abstract: A pneumatically regulated classic bearing dampens hydraulically and decouples vibrations of a small amplitude using a freely displaceable element. The bearing can be engaged using a pneumatically activated control chamber, which has a miniature configuration and is located beneath the freely displaceable element, in such a way that the element forms a deformable or displaceable element for the control chamber. In place of a compensation regulation, in the control chamber, a shift to one of three possible, pneumatically determined control states preferably takes place. The states are VENTILATED, CLOSED and PRESSURIZED.

Abstract: A vibration restraining apparatus for vehicle of the present invention is comprised of a housing formed by a rigid material and having an inner space, and fixed to a vibration transmitting member; a filled member sealed in the inner space of said housing in a non-adhered state with leaving a gap with respect to a vibrating direction of said housing, and formed by an elastic body at least at a surface thereof. When the housing resonates by vibration transmitted from the vibration transmitting member, the filled member contacts inner surface parts located at both sides of the housing in a vibrating direction thereof to exercise a damping character due to an energy loss caused by a sliding friction and a collision. Thus, a large damping character occurs inside of the housing to reduce vibration of the housing effectively. As a result, vibration of the vibration transmitting member is effectively reduced.

Abstract: A bushing for connecting mechanical components while providing a limited mobility between them has rubber elastic elements of streamlined shapes (cylinder, sphere, torus, etc.) thus having nonlinear load deflection characteristics in several coordinate directions and provides for adjustability of stiffness constants in various directions if adjusting means are built in.

Abstract: An elastomeric mounting/isolation assembly (10) having several annular elastomeric elements (12, 32, 34), several rigid sleeves (14, 16, 40), and a fastener (42), in which the radial and axial spring rates are effectively de-coupled from each other such that changing one spring rate has substantially no, or little, effect on the other spring rate. The de-coupled spring rates can enable the assembly to better meet diverse considerations involving noise, vibration, and/or harshness, commonly known as NVH, on the one hand, and vehicle dynamics on the other hand.

Abstract: An energy absorbing bearing with a primary application in the seismic isolation of structure from the ground or parts of other structures. It may also be used to dampen other forces on structures on which it is installed. The bearing consists of end plates separated by a laminate of resilient and stiffening layers. There is a plastically deformable insert within the laminate. The laminate interfaces with the end plates in each bearing and is secured near the central axis from end plate to end plate, but not near the peripheries. The advantage provided is allowing a wider range of forces to be absorbed than with known bearings of this type.