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MarketScreener Homepage  >  Equities  >  Tokyo  >  Bridgestone Corp    5108   JP3830800003

BRIDGESTONE CORP

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Japan - Researchers Submit Patent Application, “Anti-Vibration Device”, for Approval (USPTO 20190226549): Bridgestone Corporation

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08/14/2019 | 05:47pm EDT

2019 AUG 14 (NewsRx) -- By a News Reporter-Staff News Editor at Daily Asia Business -- From Washington, D.C., NewsRx journalists report that a patent application by the inventor KOJIMA, Hiroshi (Tokyo, Japan), filed on July 13, 2017, was made available online on July 25, 2019.

The patent’s assignee is Bridgestone Corporation (Tokyo, Japan).

News editors obtained the following quote from the background information supplied by the inventors: “An anti-vibration device, as disclosed in the following Patent Document 1, is known from the related art. The anti-vibration device includes a cylindrical first attaching member connected to one of a vibration generation unit and a vibration reception unit, a second attaching member connected to the other thereof, an elastic body that connects the first attaching member and the second attaching member, and a partition member that partitions a liquid chamber in the first attaching member into a main liquid chamber having the elastic body as a part of a partition wall and an auxiliary liquid chamber. The partition member is provided with a membrane which forms a part of the partition wall of the main liquid chamber, and an intermediate chamber located on a side opposite to the main liquid chamber with the membrane sandwiched therebetween and having the membrane as a part of the partition wall. Further, in the partition member, a first orifice through which the main liquid chamber and the auxiliary liquid chamber communicate with each other, and a second orifice through which the intermediate chamber and the auxiliary liquid chamber communicate with each other are formed.

“In the anti-vibration device, at the time of vibration input, the two attaching members are displaced relative to each other, while elastically deforming the elastic body, and the liquid pressure in the main liquid chamber varies which causes the liquid to flow through the first orifice and the second orifice, thereby absorbing and damping the vibration.”

As a supplement to the background information on this patent application, NewsRx correspondents also obtained the inventor’s summary information for this patent application: “Technical Problem

“Meanwhile, in the anti-vibration device configured as described above, there is a likelihood that cavitation will occur due to an increase in a flow velocity or a flow rate of liquid flowing from the auxiliary liquid chamber to the main liquid chamber through the first orifice.

“The present invention has been made in view of the above circumstances, and an object thereof is to curtail occurrence of cavitation in an anti-vibration device having two orifices.

“Solution to Problem

“An anti-vibration device of the present invention includes a cylindrical first attaching member connected to one of a vibration generation unit and a vibration reception unit, and a second attaching member connected to the other thereof; an elastic body which connects the first attaching member and the second attaching member; and a partition member which is configured to partition a liquid chamber in the first attaching member into a main liquid chamber having the elastic body as a part of a partition wall of the main liquid chamber and an auxiliary liquid chamber. The partition member includes a membrane which forms a part of the partition wall of the main liquid chamber, and an intermediate chamber which is located on a side opposite to the main liquid chamber with the membrane interposed therebetween, and has the membrane as a part of the partition wall of the main liquid chamber. In the partition member, a first orifice through which the main liquid chamber and the auxiliary liquid chamber communicate with each other, a second orifice through which the intermediate chamber and the auxiliary liquid chamber communicate with each other, and a common opening which forms an opening on the auxiliary liquid chamber side of each of the first orifice and the second orifice are formed.

“Effects of Invention

“According to the present invention, it is possible to suppress occurrence of cavitation in the anti-vibration device having two orifices.”

The claims supplied by the inventors are:

“1. An anti-vibration device comprising: a cylindrical first attaching member connected to one of a vibration generation unit and a vibration reception unit, and a second attaching member connected to the other thereof; an elastic body which connects the first attaching member and the second attaching member; and a partition member which is configured to partition a liquid chamber in the first attaching member into a main liquid chamber having the elastic body as a part of a partition wall of the main liquid chamber and an auxiliary liquid chamber, wherein the partition member includes a membrane which forms a part of the partition wall of the main liquid chamber, and an intermediate chamber which is located on a side opposite to the main liquid chamber with the membrane interposed therebetween, and has the membrane as a part of the partition wall of the main liquid chamber, and in the partition member, a first orifice through which the main liquid chamber and the auxiliary liquid chamber communicate with each other, a second orifice through which the intermediate chamber and the auxiliary liquid chamber communicate with each other, and a common opening which forms an opening on the auxiliary liquid chamber side of each of the first orifice and the second orifice are formed.

“2. The anti-vibration device according to claim 1, wherein each of the first orifice and the second orifice extends in a circumferential direction, and the second orifice is disposed on an inner side than the first orifice in a radial direction, and the common opening is formed on a wall surface defining an inner surface of the second orifice in the partition member.

“3. The anti-vibration device according to claim 1, wherein the partition member is provided with an accommodating chamber which accommodates a movable member accommodated to be deformable or displaceable in an axial direction of the first attaching member, and a first communication hole through which the accommodating chamber and the auxiliary liquid chamber communicate with each other, and a second communication hole through which the accommodating chamber and the intermediate chamber communicate with each other are formed on the wall surface defining the accommodating chamber.

“4. The anti-vibration device according to claim 2, wherein the partition member is provided with an accommodating chamber which accommodates a movable member accommodated to be deformable or displaceable in the axial direction of the first attaching member, and a first communication hole through which the accommodating chamber and the auxiliary liquid chamber communicate with each other, and a second communication hole through which the accommodating chamber and the intermediate chamber communicate with each other are formed on the wall surface defining the accommodating chamber.

“5. The anti-vibration device according to claim 1, wherein fine holes through which the intermediate chamber and the auxiliary liquid chamber communicate with each other are formed in the partition member.

“6. The anti-vibration device according to claim 2, wherein a fine hole through which the intermediate chamber and the auxiliary liquid chamber communicate with each other is formed in the partition member.”

For additional information on this patent application, see: KOJIMA, Hiroshi. Anti-Vibration Device. Filed July 13, 2017 and posted July 25, 2019. Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.html&r=1&f=G&l=50&s1=%2220190226549%22.PGNR.&OS=DN/20190226549&RS=DN/20190226549

(Our reports deliver fact-based news of research and discoveries from around the world.)

Copyright © 2019 NewsRx LLC, Daily Asia Business, source Geographic Newsletters

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