Abstract: In a vibration wave driven motor, when the radius of the arcuate portions and the length of the straight portions of a track type resilient member of an elliptical shape having straight portions and arcuate portions are (R) and (L), respectively, the ratio (R/L) is made equal to or greater than a particular value, whereby the resonance frequencies of two standing waves can be made coincident with each other and the torsion component of the straight portions can be reduced or the direction of the torsion can be made uniform with a result that the driving characteristic in the straight portions can be improved and also the electrode pattern of a piezo-electric element can be simplified.

Abstract: A radiator support bracket includes a bracket body and a stopper member. The bracket body is uniformly made of resin and has a plate-like base portion to be fixed to the vehicle frame, a transformable arm portion that extends from the base portion, and a support portion that holds the upper side of the radiator. The stopper member can also be made of resin uniformly with the bracket body.

Abstract: According to this invention, a piezo-electric element as an electro-mechanical energy conversion element is urged against a vibration member, and a vibration is excited in the vibration member by a vibration produced in the piezo-electric element. Thus, a contact member, e.g., a rotor which contacts the vibration member, and the vibration member are moved relative to each other. The rigidity of the outer side of the vibration member is larger than that of its inner side.

Abstract: A vibration driven motor comprises a bar-shaped elastic member and a piezo-electric element for causing a plurality of bending mode vibrations having a predetermined phase difference therebetween in a plurality of planes of the elastic member in order to drive a movable body by a rotary motion caused in particles of the elastic member. A support member which extends along an axial center of the bar-shaped elastic member is provided at one end or each end of the elastic member.

Abstract: In a fluid-filled vibration damping device, a rubber material is injection molded in the upper half of an inner space of a cylindrical insert plate 1 to form a damping rubber member 2 through which an inner tube 3 is retained. A concave 21 is formed in the center of the damping rubber member 2 in such a way that it extends from the periphery to a point close to the inner tube 3 such that both sidewalls thereof are left intact. The concave 21 provides a main fluid compartment A when the insert plate 1 is pressed and fixed in the outer tube. The insert plate 1 has a large concave in the lower half thereof and a plurality of openings are made in the sidewall of the concave 12 except for the bottom wall 121 thereof. A rubber layer 5, injection molded in the concave, has a central part of its width left intact in block form and part of this rubber layer provides a thin rubber wall that covers the openings in the sidewall of the concave 12 which face a cavity 53.

Abstract: A hydraulic damping device is provided including a housing having a first main liquid chamber defined in part by a rubber body which expands and contracts upon input of vibrations in a vertical direction, a second main liquid chamber defined in part by a rubber body which expands and contracts upon input of vibrations in a horizontal direction, and an auxiliary liquid chamber defined in part by a rubber film, which communicates with the first and second main liquid chambers through passageways. Upon input of vibrations in a vertical direction, one or more valves opens the passageway communicating with the first main liquid chamber and closes the passageway communicating with the second main liquid chamber to force a damping liquid filled within the first main liquid chamber to flow into the auxiliary liquid chamber, thereby damping vibrations in a vertical direction.

Abstract: A hydraulic damping device is provided having a rubber elastic body, a rubber film member closing an opening of the rubber elastic body so as to define a closed chamber, and a partition member dividing the closed chamber into two liquid chambers. A restricted liquid passageway interconnects the two liquid chambers. A cylindrical frame member composed of a resin material having a low coefficient of thermal conductivity is joined to the outer peripheral surface of the rubber elastic body. A support member composed of an aluminum alloy is secured to the outer peripheral surface of the frame member and is connected to an engine. When the support member receives a large amount of heat from the engine, the rubber elastic body is thermally insulated from the support member by virtue of the resin frame member, and accordingly, can be prevented from deteriorating due to the heat of the engine. In addition, by composing the support member of an aluminum alloy, the weight of the device can be reduced.

Abstract: In a vibration wave driven motor wherein an AC electric field is applied to an electro-mechanical energy conversion element secured to an elastic member to thereby excite a plurality of standing waves differing in phase from each other in the elastic member and a travelling wave is formed in the elastic member by the combination of the standing waves, whereby a member which is in pressure contact with the elastic member and the elastic member are moved relative to each other by a frictional force, provision is made of means for making the contact pressure on the surface of contact between the elastic member and the member which is in pressure contact with the elastic member non-uniform, and means for making the dynamic rigidity of a vibration member non-uniform in an unnecessary vibration mode created by the means for making the contact pressure non-uniform, whereby the occurrence of noise is prevented by simple and inexpensive means.

Abstract: The contact portion of a movable member is endowed with a spring property to thereby effect uniform contact over the entire circumference of the movable member, thereby realizing an ultrasonic motor which is good in efficiency and suffers little from the occurrence of sounds.

Abstract: A method for producing a cylindrical bushing with hydraulic damping includes the steps of preparing an internal ring having an elliptical cross-section including a major axis and a minor axis, disposing within the internal ring a vibration-damping rubber block through which an inner cylinder coaxially penetrates and which has wall portions for defining a liquid chamber, so that the wall portions extend along the minor axis of the internal ring; deforming the internal ring so as to have a circular cross-section; and press-fitting the deformed internal ring into an outer cylinder.

Abstract: A hydraulic damping device has a pair of supporting members to be secured to a vibrating body and a frame, respectively, and a rubber block disposed between the supporting members. A concave surface of the rubber block and a rubber sheet which is joined to the rubber block together define a liquid chamber filled with a damping liquid. A partition defines the liquid chamber into a main liquid chamber and an auxiliary liquid chamber. The partition has an opening which is closed with an elastic rubber wall. The partition is also provided with a throttle passageway which communicates with both the main liquid chamber and the auxiliary liquid chamber. The elastic rubber wall has a flat surface facing the main liquid chamber, and a concavely curved surface facing the auxiliary liquid chamber so as to have an arch-shaped cross-section.

Abstract: In a vibration wave driven motor having a vibration member having an electro-mechanical energy conversion element secured to one surface of a resilient member of an elliptical shape formed by straight portions and arcuate portions, and a member brought into pressure contact with the other surface of the resilient member and wherein AC voltages having a phase difference of 90.degree. therebetween in terms of time are applied to the driving phases of the electro-mechanical energy conversion element divided into two phases to thereby generate a travelling vibration wave in the resilient member, whereby the vibration member and the member brought into pressure contact therewith are moved relative to each other, the two driving phases of the electro-mechanical energy conversion element are polarization-processed in such a manner that only one travelling wave is formed in the straight portions of the resilient member.

Abstract: In a vibration wave driven motor, an elastic body of an elliptic shape is provided where different degrees of stiffness or rigidity are available with the arcuate portions and the straight portions, and the ratio between the distortion energy and the vibration energy that part in the generation of the natural frequency for the A vibration mode is arranged virtually equal to that ratio for the B vibration mode, thus enabling the matching of frequencies for both A and B modes.

Abstract: A vibration-damping device with hydraulic damping has a base body, a cylindrical holder secured to the base body, and an outer cylinder press-fitted within the cylindrical holder. A vibration-damping rubber body provided with a main liquid chamber enclosing a damping liquid is disposed within the outer cylinder, and retains an inner cylinder. A thin rubber wall is disposed between the outer cylinder and the vibration-damping rubber body, and defines an auxiliary liquid chamber with the vibration-damping rubber body. This auxiliary liquid chamber communicates with the main liquid chamber by way of a throttled passageway. The cylindrical holder has a rib-like projection which radially outwardly project therefrom, and extends in a circumferential direction thereof. This projection defines a groove along an inner surface of the cylindrical holder.