| YAMASHITA RUBBER KABUSHIKI KAISHA Patent applications |
| Patent application number | Title | Published |
|---|
| 20110101581 | LIQUID SEALED VIBRATION ISOLATING DEVICE - A liquid sealed vibration isolating device has an elastically movable diaphragm capable of preventing elastic deformation of a relief valve to realize high damping while preventing a cavitation phenomenon. The relief valve is provided in the elastic movable diaphragm arranged in a partition member in order to open and close a leak passage so as to prevent occurrence of the cavitation phenomenon. The relief valve is integrally formed with a fixing portion of the elastic movable diaphragm. There is provided an upwardly open concavity that the relief valve faces. The relief valve is made thicker and provided with an opening and closing adjustment groove at a basal portion of its inclined wall. The opening and closing adjustment groove is formed with a locally thin bending portion functioning as a starting point of bending in an opening and closing operation of the relief valve. | 05-05-2011 |
| 20100072683 | LIQUID SEALED VIBRATION ISOLATING DEVICE - To form a relief valve for preventing the generation of the cavitation phenomenon into a simple and accurately operable structure, there are provided a central thin wall portion and a fixing portion in an elastic diaphragm provided in the partition member to have the fixing portion fixed in position. A relief valve is integrally formed with an outer peripheral portion of the fixing portion. The relief valve is provided with an inclined surface formed on the side of a secondary liquid chamber and a recessed portion opened on the side of a primary liquid chamber and has a difference in rigidity in the circumferential direction. When the primary liquid chamber turns negative pressure, a hydraulic liquid in the secondary liquid chamber opens the relief valve and leaks to the primary liquid chamber so as to prevent the generation of the cavitation phenomenon. | 03-25-2010 |
| 20080315473 | TORQUE ROD - A torque rod having an arm portion, a ring portion formed on each end of the arm portion in a longitudinal direction of the arm portion, and a rubber bushing that is integrally provided with the ring portion. The arm portion is formed from a material that is lower in specific gravity than iron. A weight is provided in a portion of the rubber bushing other than a principal spring portion. The principal spring portion, which absorbs principal vibration to be isolated, is formed by an elastic arm portion that extends radially outwardly from an inner cylinder located substantially in a center of the rubber bushing and is connected to the ring portion. An aperture, which is a separation space, is provided between the elastic arm portion and the ring portion. | 12-25-2008 |
| 20080315472 | LIQUID SEALED VIBRATION ISOLATING DEVICE - A liquid sealed vibration isolating device having a first mounting member to be mounted on the side of a vibration source, a second mounting member to be mounted on the side to be vibrated, and an insulator being placed between said first and second mounting members so as to absorb vibration. A liquid chamber uses the insulator as a part of a wall thereof and is filled with a hydraulic liquid. A partition member partitions the liquid chamber into a primary liquid chamber and a secondary liquid chamber. A passage is provided between the primary and secondary liquid chambers. A valve portion is provided on a diaphragm enclosing the secondary liquid chamber to open and close a port of the passage. The valve portion has an annular thick wall portion which comes into contact with a valve seat portion provided around the port of the passage and a central movable elastic diaphragm portion which is provided on an inside of the annular thick wall portion and is thinner than the annular thick wall portion so as to be elastically deformable by a liquid pressure of the hydraulic liquid. The hydraulic liquid passing through the passage causes orifice resonance when passage is opened by the valve portion. The diaphragm, including the valve portion, is adapted to membrane-resonate at a frequency in the vicinity of a resonance frequency of the orifice resonance. | 12-25-2008 |
| 20080284076 | CYLINDRICAL VIBRATION ISOLATING DEVICE - The object of the present invention is to prevent damages of a vibration isolating rubber and cracks in a welded portion of a sub-frame when press-fitting a sub-frame mount. | 11-20-2008 |
| 20080284075 | LIQUID SEALED VIBRATION ISOLATING DEVICE - To block the transmission to a vehicle body side of the vibration due to the cavitation phenomenon occurred in a primary liquid chamber so as to prevent the generation of noises, at the same time, to make the device compact, and to improve the fitting accuracy to obtain the reliable positioning, a first metallic fitting and a second metallic fitting are connected by an insulator. A primary liquid chamber and a secondary liquid chamber formed inwardly are partitioned by a partition member and communicated therebetween by an orifice passage. The partition member is floatingly supported between an extended portion of the insulator and an outer peripheral thick wall portion of a diaphragm, and the tuning is performed to generate the rigid resonance at the predetermined frequency. An outer ring is provided in the outer peripheral thick wall portion so as to be securely fixed by a fixing portion formed by bending an end of an outer cylindrical fitting. The floatingly supporting structure does not become large-sized and complicated since the partition member is simply floatingly supported. | 11-20-2008 |
| 20080258364 | CYLINDRICAL VIBRATION ISOLATING DEVICE - A cylindrical vibration isolating device having an inner cylinder, an outer cylinder surrounding the inner cylinder, an elastic leg having a pair of right and left leg portions to connect the inner cylinder and the outer cylinder and, when viewed in the axial direction of the inner cylinder, being formed in a substantially inverted V-shape while placing the inner cylinder in an intermediate position, and a mass projection being provided in the elastic leg such that the mass projection resonates in a frequency range that the elastic leg causes bending resonance. The mass projection is provided outside of an inner restraint line that is a perpendicular line passing an outermost point of an inner restrained portion that is a connected portion between the inner cylinder and the elastic leg. | 10-23-2008 |
| 20080235946 | LINK ROD MANUFACTURING METHOD - In a method of manufacturing link rod which integrally joins bushes to each end of pipe-shaped arm portion, an extrusion molded bracket material ( | 10-02-2008 |
| 20080230968 | LIQUID SEALED VIBRATION ISOLATING DEVICE - A vibration isolating device includes an insulator for isolating the transmission of an inputted vibration by an elastic deformation. A principal vibration input portion is provided in a central area of a concave curved wall portion formed in the insulator. A thin wall portion and a thick wall portion are formed by relatively varying a thickness of the insulator around the vibration input portion, wherein the concave curved wall portion of the insulator is formed in a substantially circular shape when viewed in a principal vibration inputted direction. The thick wall portion is formed substantially in the shape of a belt of a predetermined width and extends across the concave curved wall portion in the diametrical direction thereof while passing the vibration input portion. A rigid body covering portion for covering a surface of a metallic member of the vibration input portion is provided in the central area of the thick wall portion. A thickness of the rigid body covering portion is at least 1.7 mm. | 09-25-2008 |
