JP4954146B2 - Liquid filled vibration isolator - Google Patents

Description

  The present invention includes a central member, a cylindrical member disposed on the outer side in the radial direction of the central member, a rubber member disposed between these members and connecting these members, an axial vibration, and A main liquid chamber provided for vibrations in a direction perpendicular to the main liquid chamber, and the liquid filled in these main liquid chambers flows in and out via the orifice to resonate the fluid passing through the orifice. In particular, the present invention relates to a liquid-filled vibration isolator configured to provide a desired vibration isolating performance, and more particularly to a device capable of increasing the degree of freedom in layout of rubber members.

  FIG. 1 is a cross-sectional view showing a so-called two-way liquid-filled vibration isolator having a vibration isolating effect against both axial vibration and vibration in a direction orthogonal thereto. The liquid-filled vibration isolator 90 includes a center member 91, a cylindrical member 92 disposed on the radially outer side of the center member 91, and the members 91, 92 disposed between the members 91, 92. A partition member 94 for partitioning the inside of the cylindrical member 92 in a liquid-tight manner in the length direction on one side in the axial direction of the rubber member 93, and the partition member 94 and the rubber member 93. The first main liquid chamber 96 filled with the liquid is formed between the first main liquid chamber 96 and the membrane member 95 is provided on the opposite side of the first main liquid chamber 96 with the partition member 94 interposed therebetween. The liquid is filled between the two and expands or contracts according to the liquid pressure. A chamber 97 is formed, and a first orifice 98 is provided to allow the first main liquid chamber 96 and the sub liquid chamber 97 to communicate with each other. Further, the chamber 97 is arranged in the circumferential direction at an axially intermediate position of the rubber member 3. A plurality of second main liquid chambers 81 are formed, and a second orifice 82 is provided to connect the second main liquid chamber 81 and the sub liquid chamber 97 to each other.

Such a liquid-filled vibration isolator 90 causes vibrations in the axial direction X and the direction Y orthogonal thereto when the center member 91 and the cylindrical member 92 are relatively displaced, to the fluid passing through the orifices 98 and 82. Constructed to give desired vibration isolation performance by resonance action, for example, used to reduce the vehicle vertical and longitudinal components of vibration transmitted from the engine to the vehicle body side that supports the engine (For example, refer to Patent Document 1).
JP 2006-125617 A

  However, similarly to the first orifice 98, the second orifice 82 also has a circumferential direction on the outer periphery of the rubber member 93 below the second main liquid chamber 81, as shown in FIG. In this case, when trying to obtain a rubber member having a desired diameter, there is a problem that the size of the vibration isolator becomes large. .

  The present invention has been made in view of such problems, and by extending the rubber member to the inside of the outer cylinder, the vibration damping performance of the rubber member is improved or the freedom in layout of the rubber member is achieved. An object of the present invention is to provide a liquid-filled vibration isolator capable of increasing the degree.

<1> includes a central member, a cylindrical member disposed on the outer side in the radial direction of the central member, and a rubber member that is disposed between the members and connects the members, and the rubber member A partition member for liquid-tightly partitioning the inside of the cylindrical member in the longitudinal direction on one side in the axial direction of the first main liquid chamber filled with liquid between the partition member and the rubber member. A sub liquid chamber that is formed and provided with a film member on the opposite side of the first main liquid chamber across the partition member and is filled with liquid between the film member and the partition member and expands or contracts according to the liquid pressure. And a plurality of second main liquids arranged in a circumferential direction at an axially intermediate position of the rubber member, wherein the first main liquid chamber and the sub liquid chamber communicate with each other. Forming a chamber, and communicating the second main liquid chamber and the sub liquid chamber with each other. In the liquid-filled vibration isolator, the second orifice passes in the axial direction from the second main liquid chamber through a partition wall portion of the rubber member that divides the second main liquid chamber in the circumferential direction. The liquid-filled vibration isolator is characterized by comprising a flow path that reaches the auxiliary liquid chamber.
It is.

  <2> is the liquid-filled vibration isolator according to <1>, wherein the second orifice is extended into the second main liquid chamber.

  According to <1>, the second orifice passes from the second main liquid chamber in the axial direction through a partition wall portion of the rubber member that divides the second main liquid chamber in the circumferential direction, and is a sub liquid chamber. Therefore, it is not necessary to extend these second orifices in the circumferential direction on the radially outer side of the rubber member on the lower side of the second main liquid chamber. The diameter of the rubber member can be increased with respect to the cylindrical member having the same inner diameter, thereby improving the vibration isolation performance and increasing the degree of freedom in layout design.

  According to <2>, since the second orifice is extended into the second main liquid chamber, when the required flow resistance cannot be obtained simply by extending the partition wall portion in the axial direction, A desired flow resistance can be obtained by using the portion extended into the second main liquid chamber as an orifice.

  Embodiments of the present invention will be described with reference to the drawings. 2 is a cross-sectional view showing the liquid-filled vibration isolator of the first embodiment in a cross section passing through its central axis, and FIG. 3 is a cross-sectional view corresponding to the view taken along the arrow III-III in FIG. 4 is a cross-sectional view corresponding to the view taken along arrows IV-IV in FIG. 2, and FIG. 5 is a perspective view showing a rubber member. 2 is a cross-sectional view corresponding to the view taken along arrows II-II in FIG. 3 and FIG.

  As shown in FIGS. 2 to 5, the liquid-filled vibration isolator 10 includes a central member 1 located at the center, a cylindrical member 2 disposed on the radially outer side of the central member 1, and these members 1, 2 is a partition member that includes a rubber member 3 that is disposed between two members 1 and 2 and connects the members 1 and 2 to each other, and partitions the inside of the cylindrical member 2 in a liquid-tight manner in the longitudinal direction on one side in the axial direction of the rubber member 3. 4 is formed, and a first main liquid chamber 6 filled with a liquid is formed between the partition member 4 and the rubber member 3, and at the opposite side of the first main liquid chamber 6 across the partition member 4. A membrane member 5 is provided to form a sub liquid chamber 7 which is filled with liquid between the membrane member 5 and the partition member 4 and expands / contracts according to the liquid pressure, and the first main liquid chamber 6 and the sub liquid chamber 7 are mutually connected. A first orifice 8 communicating with the first orifice 8 is provided.

  The liquid-filled vibration isolator 10 is further formed with second main liquid chambers 21 and 22 filled with liquid in a plurality of circumferential portions at the axially intermediate position of the rubber member 3. The two main liquid chambers 21 and 22 are arranged at two positions in the circumferential direction at positions shifted from each other by 180 degrees. And the 2nd orifices 23 and 24 which connect the 2nd main liquid chambers 21 and 22 and the subliquid chamber 7 are each provided.

  Here, the liquid-filled vibration isolator 10 according to the present invention is characterized in that one of the second orifices 23 and 24 is connected from the second main liquid chamber 21 to the second main liquid chamber 21 of the rubber member 3. 22 is constituted by a flow path that passes through one of the partition wall portions 31 and 32 in the circumferential direction and reaches the auxiliary liquid chamber 7 in the axial direction. Similarly, the other 24 of the second orifices 23 and 24 is the second The main liquid chamber 22 is constituted by a flow path that reaches the sub liquid chamber 7 through the other 32 of the partition walls 31 and 32 that divide the second main liquid chambers 21 and 22 in the circumferential direction from the main liquid chamber 22 in the axial direction. Has been.

  The second orifices 23, 24 are formed by vulcanizing and bonding the orifice forming members 25, 27 made of a molded product such as resin formed in a shape surrounding the cylindrical member 2 to the rubber member 3. Can be formed.

  In the liquid-filled vibration isolator 10 configured as described above, when the center member 1 and the tubular member 2 are relatively displaced in the axial direction due to the vibration in the vertical direction X of the vehicle, the first main main body 1 is generated accordingly. The vibrational change in the volume of the liquid chamber 6 generates a reciprocating movement of the liquid via the first orifice 8 between the first main liquid chamber 6 and the first sub liquid chamber 7, and the viscosity at that time. The resistance suppresses the relative displacement in the axial direction between the center member 1 and the cylindrical member 2 and suppresses the vibration in the vertical direction X of the liquid-filled vibration isolator 10.

  Further, in the liquid-filled vibration isolator 10 in which the second main liquid chambers 21 and 22 are arranged so as to face the front-rear direction of the vehicle, vibrations in the front-rear direction of the vehicle are generated along with vibrations in the vertical direction X of the vehicle. When the input and relative displacement of the central member 1 and the cylindrical member 2 in the direction corresponding to the longitudinal direction of the vehicle (the Y direction in FIG. 2), the volume of one of the second main liquid chambers 21 and 22 is reduced, A vibrational change in which the other volume expands occurs, and this change is caused by the reciprocating movement of the liquid between the second main liquid chamber 21 and the sub liquid chamber 7 via the second orifice 23, and the second orifice. The reciprocating movement of the liquid between the second main liquid chamber 22 and the sub liquid chamber 7 via 24 is generated, and the Y direction between the central member 1 and the cylindrical member 2 is generated by viscous resistance and liquid column resonance at that time. Relative displacement is suppressed.

  On the other hand, since the volume of the second main liquid chambers 21 and 22 hardly changes with respect to the vibration input in the left-right direction of the vehicle, the relative displacement is not greatly suppressed. Thus, in the liquid filled type vibration isolator 10, vibrations in a direction orthogonal to the axial direction can be selectively suppressed according to the input direction.

  In the liquid filled vibration isolator 10 configured as described above, the second orifices 23 and 24 communicate with the auxiliary liquid chamber 7 through only the partition portions 31 and 32 of the rubber member 3 and the partition member 4. Therefore, the rubber member 3 can be expanded below the second main liquid chambers 21 and 22 to the same diameter as the outer peripheral portion of the second main liquid chambers 21 and 22, and the vibration damping effect by the rubber member 3 is maximized. Design that can be used in the future becomes possible, and the degree of freedom of design can be expanded.

Here, since the second orifices 23 and 24 extend in the axial direction through the narrow partition wall portions 31 and 32, there is a possibility that restrictions may be imposed on the dimensions of the second orifices 23 and 24, particularly the length thereof. In that case, as shown in a sectional view corresponding to FIG. 3 in a modified example of the liquid-filled vibration isolator in FIG. 6, the second main liquid chamber extension portions 27 and 28 are provided in the second orifices 23A and 24A. It is preferable to make the length as desired by providing it. In this case, the orifice forming members 25A, 26A surrounding the second orifices 23A, 24A between the tubular member 2
May be configured to also surround the second main liquid chamber extension portions 27 and 28.

  In FIG. 2, reference numeral 15 is a membrane made of an elastic member, 16 is a membrane housing chamber for housing the membrane 15, 19 is a membrane pressing member for closing the membrane 15 in the membrane housing chamber 16, 17. Denotes an opening that allows the main liquid chamber 6 and the membrane storage chamber 16 to communicate with each other, and 18 denotes an opening that allows the membrane storage chamber 16 and the auxiliary liquid chamber 7 to communicate with each other.

  When the vibration input exceeds a predetermined frequency, the membrane 15 allows the liquid to move between the main liquid chamber 6 and the sub liquid chamber 7 by passing through the orifice 8 due to a response delay due to the viscosity of the liquid. The membrane 15 is provided to enable the liquid to move even in response to vibration input in a high frequency region against the phenomenon that cannot be performed, and the membrane 15 is formed of, for example, a plate-like rubber material and has a predetermined frequency or higher. Since a gap is formed between the membrane 15 and its surroundings that is not formed in a state where it does not vibrate, the membrane accommodating chamber 16 around the membrane 15 is opened from the opening 17 of the membrane pressing member 19. A flow path that passes through the portion and reaches the opening 18 is formed, thereby securing a flow path that connects the main liquid chamber 6 and the sub liquid chamber 7 even in the high-frequency region. Bets can be, as a result, even for high frequency vibration input, it is possible to obtain a good vibration damping characteristics.

  The liquid filled type vibration damping device according to the present invention can be used as an engine mount or body mount of an automobile.

It is sectional drawing which shows the conventional liquid enclosure type vibration isolator. It is sectional drawing which shows the liquid enclosure type vibration isolator of embodiment which concerns on this invention. It is sectional drawing corresponding to the III-III arrow of FIG. It is sectional drawing corresponding to the IV-IV arrow of FIG. It is a perspective view which shows a rubber member. It is sectional drawing which shows the liquid enclosure type vibration isolator of the modification.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Center member 2 Cylindrical member 3 Rubber member 4 Partition member 5 Membrane member 6 1st main liquid chamber 7 Sub liquid chamber 8 1st orifice 10 Liquid enclosure type vibration isolator 15 Membrane 16 Membrane storage chamber 17 It was formed in the pressing plate Opening 18 Opening formed in membrane housing chamber 19 Membrane pressing member 21, 22 Second main liquid chamber 23, 23A, 24, 24A Second orifice 25, 25A, 26, 26A Orifice forming member 27, 28 Second main Liquid chamber extension 31, 32 Bulkhead of rubber member

Claims (2)

A center member, a cylindrical member disposed radially outside the center member, and a rubber member disposed between the members and connecting the members to each other, and one axial side of the rubber member A partition member for liquid-tightly partitioning the inside of the cylindrical member in the longitudinal direction, and forming a first main liquid chamber filled with liquid between the partition member and the rubber member, and A membrane member is provided on the opposite side of the main liquid chamber across the partition member to form a sub liquid chamber that is filled with liquid between the membrane member and the partition member and expands or contracts according to the fluid pressure. A first orifice for communicating one main liquid chamber and the sub liquid chamber with each other, and forming a plurality of second main liquid chambers arranged in a circumferential direction at an axially intermediate position of the rubber member; A second orifice was provided to allow these second main liquid chamber and the sub liquid chamber to communicate with each other. In the body-filled vibration damping device,
The second orifice is configured by a flow path that extends from the second main liquid chamber to a sub liquid chamber through an axial direction of a partition wall of the rubber member that divides the second main liquid chamber in the circumferential direction. A liquid-filled vibration isolator characterized by comprising:   The liquid-filled vibration isolator according to claim 1, wherein the second orifice is extended into the second main liquid chamber. .

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