JP2009293746A - Vibration insulation device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To smoothly operate a movable member to make a vibration insulation device function appropriately. <P>SOLUTION: The vibration insulation device is provided with a cylindrical member, a mounting member, a rubber elastic body elastically interconnecting the cylindrical member and the mounting member and closing one opening end of the cylindrical member, a diaphragm closing the other opening end of the cylindrical member, and a partition member 7 for partitioning a liquid chamber within the cylindrical member into a main liquid chamber and an auxiliary liquid chamber. The partition member 7 is provided with an orifice member 70 having an orifice passage 81 and a storage chamber 76, a lid body 73 fitted to the orifice member 70, and the movable member 71 stored within the storage chamber 76 and operated along with change in liquid pressure of the main liquid chamber. In the orifice member 70, a press fitted part 88 to which a peripheral wall part 73c of the lid body 73 is press fitted is formed around the storage chamber 76, and a groove 77 is formed on the end face of the orifice member. The press fitted part is formed on an outer peripheral part 70a arranged on the outer side of the groove 77, and an inner peripheral part 70b arranged on the inner side of the groove 77 is separated from the outer peripheral part 70a. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vibration isolator that is used when mounting a vibration generating unit such as an automobile engine on a vibration receiving unit such as a vehicle body.

  Conventionally, as this type of vibration isolator, for example, as shown in Patent Document 1 below, a cylindrical member connected to one of a vibration generator and a vibration receiver, a vibration generator, and a vibration receiver An attachment member connected to one of the other parts, a rubber elastic body that elastically connects the tubular member and the attachment member and closes one open end of the tubular member, and the other open end of the tubular member There is known a configuration including a diaphragm that closes the liquid and a partition member that is formed inside the cylindrical member and partitions a liquid chamber in which a liquid is sealed into a main liquid chamber and a sub liquid chamber. The main liquid chamber described above is a liquid chamber in which a part of the partition wall is formed of a rubber elastic body and the internal volume changes due to the deformation of the rubber elastic body. The sub liquid chamber described above is formed of a part of the partition wall using a diaphragm. Liquid chamber.

  An orifice member that is fitted inside the cylindrical member and communicates with the main liquid chamber and the secondary liquid chamber, and an accommodating chamber that extends in the central axis direction of the cylindrical member. A lid that is press-fitted into the end of the orifice member on the main liquid chamber side and covers the open end of the storage chamber on the main liquid chamber side, and a piston (movable member) stored inside the storage chamber. It has been. The piston is movable along the inner peripheral surface of the storage chamber as the hydraulic pressure in the main liquid chamber varies.

In the conventional vibration isolator having the above-described configuration, high accuracy is required for the coaxiality between the central axis of the storage chamber and the drive center axis of the piston and the roundness of the storage chamber in order for the piston to function properly. Is done. If the accuracy of at least one of the coaxiality and the roundness is poor, the clearance accuracy between the inner peripheral surface of the storage chamber and the outer peripheral surface of the piston decreases, and the inner peripheral surface of the storage chamber and the piston There is a risk of interference with the outer peripheral surface of the part. In this case, the operation of the piston is hindered by the interference portion, causing a problem that the piston does not operate smoothly and the vibration isolator does not function properly. Therefore, conventionally, in order for the vibration isolator to function properly, the housing chamber and the drive shaft of the piston are formed by machining to ensure the coaxiality and the accuracy of the perfect circle.
JP 2007-100754 A1

  However, in the above-described conventional vibration isolator, when the lid is press-fitted into the end of the orifice member, the orifice member is deformed by the stress caused by the press-fitting, and the central axis of the storage chamber is eccentric or the storage chamber is elliptical. There is a risk of deformation. As a result, the accuracy of the coaxiality between the central axis of the storage chamber and the drive center axis of the piston and the roundness of the storage chamber may not be ensured. In this case, the piston does not operate smoothly. This causes a problem that the vibration isolator does not function properly.

  The present invention has been made in consideration of the above-described conventional problems, and an object thereof is to allow a movable member (piston) to operate smoothly so that a vibration isolator functions properly.

  A vibration isolator according to the present invention includes a cylindrical member connected to one of a vibration generating unit and a vibration receiving unit, and an attachment connected to either one of the vibration generating unit and the vibration receiving unit. A rubber elastic body that elastically connects the member, the tubular member, and the mounting member, and closes one open end of the tubular member, a diaphragm that closes the other open end of the tubular member, and the tubular A liquid chamber formed inside the member and enclosing a liquid, a main liquid chamber in which a part of the partition wall is formed of the rubber elastic body and the internal volume changes due to deformation of the rubber elastic body, and a part of the partition wall A sub-liquid chamber formed of the diaphragm, and a partition member partitioned into the diaphragm, wherein the partition member is fitted inside the cylindrical member, and the main liquid chamber and the sub-liquid chamber An orifice passage communicating with the chamber, and the cylindrical portion An orifice member formed with a storage chamber that extends along the central axis direction of the storage chamber and is open at least on one side, a ceiling wall portion that covers an opening end on one side of the storage chamber, and a suspension wall that is suspended from the ceiling wall portion Each having a peripheral wall portion, and a lid attached to an end portion of the orifice member on the main liquid chamber side, housed inside the housing chamber, and operated in accordance with a change in fluid pressure of the main liquid chamber A movable member that is formed on the main liquid chamber side of the orifice member, and a press-fitted portion into which the peripheral wall portion is press-fitted is formed around the storage chamber. A groove extending along the circumferential direction of the storage chamber is formed on the inner surface of the press-fitting portion in the radial direction of the storage chamber on the end surface on the liquid chamber side, and among the end portions on the main liquid chamber side of the orifice member, The press-fit portion is formed on the outer peripheral portion provided on the outer side in the radial direction of the groove accommodating chamber. Is, inner peripheral portion which is provided inside the housing chamber radially of the groove is characterized in that it is spaced from the outer peripheral portion.

  With such a feature, when the lid is assembled to the orifice member, the peripheral wall portion of the lid is press-fitted into a press-fit portion formed on the outer periphery of the groove. At this time, since the inner peripheral part inside the groove is separated from the outer peripheral part described above, the stress at the time of press-fitting the peripheral wall part is hardly transmitted to the inner peripheral part, and the peripheral wall part is press-fitted. Thus, even if the outer peripheral portion is deformed, the inner peripheral portion is hardly deformed. That is, the deformation of the outer peripheral portion when the peripheral wall portion is press-fitted is absorbed by the groove, and the deformation of the inner peripheral portion when the peripheral wall portion is press-fitted is suppressed.

  The vibration isolator according to the present invention includes a first orifice passage that passes through the storage chamber as the orifice passage in the orifice member, and a second orifice passage that has a larger liquid flow resistance than the first orifice passage. Are formed on the inside of the storage chamber as the movable member, and move along the inner peripheral surface of the storage chamber according to the fluid pressure fluctuation of the main liquid chamber to open and close the first orifice passage. It is preferable that the piston is accommodated.

  Thereby, the orifice passage through which the liquid in the liquid chamber flows is switched by moving the piston along the inner peripheral surface of the storage chamber. That is, when the piston moves in the main liquid chamber along the inner peripheral surface of the storage chamber due to the fluctuation of the liquid pressure and is disposed at a position closing the first orifice passage, the liquid in the liquid chamber flows through the second orifice passage. Thus, it moves between the main liquid chamber and the sub liquid chamber. On the other hand, when the piston moves along the inner peripheral surface of the storage chamber due to the fluctuation of the hydraulic pressure in the main fluid chamber and is disposed at a position where the first orifice passage is opened, the liquid is preferentially given to the one having the lower hydraulic resistance. Since the fluid flows, the liquid in the liquid chamber flows through the first orifice passage between the main liquid chamber and the sub liquid chamber.

  In the vibration isolator according to the present invention, it is preferable that a holding member for holding the inner peripheral shape of the storage chamber is fitted inside the opening end of the storage chamber on the main liquid chamber side.

  As a result, the end of the inner peripheral surface of the storage chamber on the main liquid chamber side is pressed from the inside of the storage chamber by the holding member, and the shape of the inner peripheral surface of the storage chamber is maintained.

  In the vibration isolator according to the present invention, a communication hole that connects the main liquid chamber and the storage chamber is formed in the lid, and the partition member is disposed inside the storage chamber. And a check valve that allows the liquid to flow only in the direction from the main liquid chamber to the storage chamber by opening and closing the communication hole, and inside the opening end of the storage chamber on the main liquid chamber side, As the holding member, it is preferable that the check valve is disposed between the lid body and the check valve receiving member for supporting the check valve.

  Thus, by assembling the check valve receiving member that supports the check valve to the orifice member, the end portion on the main liquid chamber side of the inner peripheral surface of the storage chamber is pressed from the inside of the storage chamber by the check valve receiving member. The shape of the inner peripheral surface of the storage chamber is maintained.

  In the vibration isolator according to the present invention, it is preferable that the depth of the groove is deeper than a press-fitting allowance of the peripheral wall portion to the orifice member.

  As a result, when the cover wall is press-fitted into the press-fit portion formed on the outer periphery of the groove and the cover body is assembled to the orifice member, the stress during the press-fitting of the peripheral wall portion is reliably absorbed by the groove. The deformation of the inner peripheral portion can be suppressed more reliably.

  In the vibration isolator according to the present invention, it is preferable that a plurality of notches are formed in the peripheral wall portion.

  Thereby, the press-fitting stress acting on the outer peripheral portion when the peripheral wall portion is press-fitted into the press-fit portion is reduced.

  Furthermore, in the vibration isolator according to the present invention, it is preferable that the plurality of cutout portions are disposed at equal intervals along the circumferential direction of the peripheral wall portion.

  Thereby, when the peripheral wall portion is press-fitted into the press-fit portion, the press-fitting stress acts uniformly on the outer peripheral portion. Further, when the peripheral wall portion is press-fitted into the press-fit portion, relative positioning between the lid body and the orifice member is facilitated.

  According to the vibration isolator of the present invention, the deformation of the outer peripheral portion when the peripheral wall portion of the lid body is press-fitted is absorbed by the groove, and the deformation of the inner peripheral portion when the peripheral wall portion is press-fitted is suppressed. When assembled to the member, it is possible to prevent the central axis of the storage chamber from being eccentric or the inner peripheral shape of the storage chamber from being deformed. Thereby, a movable member can be operated smoothly and a vibration isolator can be functioned appropriately.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a vibration isolator according to the present invention will be described with reference to the drawings.

[First embodiment]
First, a first embodiment according to the present invention will be described with reference to FIGS.
FIG. 1 is a cross-sectional view of a vibration isolator 1 according to the present embodiment, FIG. 2 is a cross-sectional view of a partition member 7 to be described later, and FIG. 3 is an exploded perspective view of the partition member 7 to be described later.
Further, in the present embodiment, the lower side in FIG. 1 is the bounce side, that is, the direction in which a static load (initial load) is input when the vibration isolator 1 is installed, and the upper side in FIG. This is the opposite side of the static load input direction, and in the following description, the bound side is the lower side and the rebound side is the upper side.

  As shown in FIG. 1, the vibration isolator 1 is used when an engine, which is an example of a vibration generating unit, is mounted on a vehicle body, which is an example of a vibration receiving unit, to attenuate the vibration of the vibration generating unit. It is a device. As shown in FIG. 1, the vibration isolator 1 includes an inner cylinder 2 (corresponding to an attachment member in the present invention) and an outer cylinder 3 (corresponding to a cylinder member in the present invention) arranged on the same axis L. And a rubber elastic body 4 that is integrally formed on the inner cylinder 2 and the outer cylinder 3 by vulcanization adhesion.

  The inner cylinder 2 is a member connected to an engine (not shown). More specifically, the inner cylinder 2 is a member that is gradually reduced in diameter toward the lower side and whose lower end is rounded into a spherical shape, and is embedded in the rubber elastic body 4. The inner cylinder 2 is formed with a bottomed female screw portion 2a extending downward from the upper end surface thereof, and is attached to an engine (not shown) by a bolt (not shown) screwed into the female screw portion 2a. An unillustrated engine side bracket is attached.

  The outer cylinder 3 is a substantially cylindrical member connected to a vehicle body (not shown). More specifically, the outer cylinder 3 includes a lower small-diameter portion 30, an upper large-diameter portion 31, and a throttle portion that is interposed between the small-diameter portion 30 and the large-diameter portion 31 and is reduced in diameter in the radial direction. 32. The outer peripheral portion of the rubber elastic body 4 is vulcanized and bonded to the inner peripheral surface of the large diameter portion 31. Further, the inner peripheral surfaces of the narrowed portion 32 and the small diameter portion 30 are covered with an inner peripheral covering rubber 33 over the entire periphery. The inner peripheral covering rubber 33 is vulcanized and bonded to the inner peripheral surfaces of the narrowed portion 32 and the small diameter portion 30, and its upper end is connected to the lower end of the rubber elastic body 4 and is integrally formed with the rubber elastic body 4. Yes.

  A side opening 35 is formed in a portion of the outer cylinder 3 adjacent to a communication portion (main liquid chamber side communication passage 84) between an orifice passage 81 described later and a main liquid chamber 6 </ b> A described later. More specifically, a side opening 35 is formed in the small diameter portion 30 of the outer cylinder 3. The side opening 35 is closed by a thin film membrane 36. The membrane 36 is a rubber film that can be deformed in accordance with a change in the internal pressure of the main liquid chamber 6 </ b> A described later, and is stretched so as to close the side opening 35. The membrane 36 is connected to the inner peripheral covering rubber 33 described above, and is formed integrally with the rubber elastic body 4 and the inner peripheral covering rubber 33.

  Further, an outer peripheral seal rubber 34 is provided on the outer peripheral surfaces of the upper end portions of the throttle portion 32 and the small diameter portion 30 over the entire circumference. The outer peripheral seal rubber 34 is vulcanized and bonded to the outer peripheral surfaces of the upper end portions of the throttle portion 32 and the small diameter portion 30 and connected to the upper end of the membrane 36 so as to be integrated with the rubber elastic body 4, the inner peripheral covering rubber 33 and the membrane 36. Is formed.

  The outer cylinder 3 having the above-described configuration is attached to a vehicle body side bracket 10 attached to a vehicle body (not shown). The vehicle body side bracket 10 includes a substantially cylindrical holder portion 11 that holds the outer cylinder 3, and a leg portion 12 that is connected to a vehicle body (not shown). The holder portion 11 is interposed between the upper small-diameter portion 13, the lower large-diameter portion 14, and the small-diameter portion 13 and the large-diameter portion 14, and extends from the lower end of the small-diameter portion 13 toward the upper end of the large-diameter portion 14. And a flange portion 16 that protrudes radially outward from the upper end portion of the small-diameter portion 13. The leg portion 12 is a substantially L-shaped plate portion that projects outward in the radial direction, and is disposed on both the left and right sides of the central axis of the large diameter portion 14. Ribs 12 a are provided at both ends of the leg 12.

  The outer cylinder 3 is fitted inside the holder portion 11 described above. More specifically, the outer cylinder 3 is press-fitted inside the holder part 11, and the large diameter part 31, the throttle part 32, and the upper end part of the small diameter part 30 of the outer cylinder 3 are inside the small diameter part 13 of the holder part 11. The outer peripheral seal rubber 34 of the outer cylinder 3 is pressed against the inside of the small diameter portion 13 of the holder portion 11. Further, a small diameter portion 30 of the outer cylinder 3 is disposed inside the large diameter portion 14 of the holder portion 11 with a space therebetween, and between the inner peripheral surface of the holder portion 11 and the outer peripheral surface of the outer cylinder 3. A gap S is formed over the entire circumference. That is, between the inner peripheral surface of the large diameter portion 14 of the holder portion 11 and the outer peripheral surface of the small diameter portion 30 of the outer cylinder 3, and between the inner peripheral surface of the large diameter portion 14 of the holder portion 11 and the outer surface of the membrane 36. There is a gap S between them. The gap S is not filled with liquid or the like, and the gap S is an air chamber.

  A seal member 9 that seals the gap S described above is fitted between the outer peripheral surface of the outer cylinder 3 and the inner peripheral surface of the holder portion 11. The seal member 9 is a ring member formed in a ring shape along the outer peripheral surface of the outer cylinder 3 (small-diameter portion 30) having a substantially U shape in a longitudinal section, and includes a vehicle body side bracket 10, the outer cylinder 3, and a rubber elastic body. 4 is a separate member.

  The rubber elastic body 4 is a member that elastically connects the inner cylinder 2 and the outer cylinder 3 and closes the open end on the upper side (one side) of the outer cylinder 3. More specifically, the rubber elastic body 4 is a dome-shaped rubber elastic body that closes the large-diameter portion 31 of the outer cylinder 3, and the inner peripheral surface of the large-diameter portion 31 and the outer peripheral surface of the trunk portion 21 of the inner cylinder 2. It is interposed between.

Further, the vibration isolator 1 is provided with a diaphragm 5 that closes the lower (other) open end of the outer cylinder 3. Between the diaphragm 5 and the rubber elastic body 4, for example, ethylene A liquid chamber 6 in which a liquid such as glycol, water, or silicone oil is enclosed is formed.
More specifically, the diaphragm 5 includes a diaphragm ring 50 fitted inside the small diameter portion 30 of the outer cylinder 3 via an inner peripheral rubber 33, and a diaphragm rubber 51 formed inside the diaphragm ring 50. ing. The diaphragm ring 50 is a metal annular member, is fitted inside the lower end portion of the outer cylinder 3, and is crimped and fixed by bending the lower end portion of the outer cylinder 3 radially inward. The diaphragm rubber 51 is a thin film member that can be deformed in accordance with a change in the hydraulic pressure (internal pressure) in the sub-liquid chamber 6B described later, and is vulcanized and bonded to the inner peripheral surface of the diaphragm ring 50.

  The liquid chamber 6 is a chamber surrounded by the lower surface of the rubber elastic body 4, the inner peripheral surface (inner peripheral rubber 33) of the outer cylinder 3, and the upper surface of the diaphragm 5. The liquid chamber 6 is partitioned into a rebound-side main liquid chamber 6A and a bound-side sub-liquid chamber 6B by a partition member 7 disposed therein. The main liquid chamber 6 </ b> A is a chamber in which a part of the partition wall (upper wall) is formed of the rubber elastic body 4, and the internal volume of the main liquid chamber 6 </ b> A changes due to deformation of the rubber elastic body 4. The sub liquid chamber 6B is a chamber in which a part of the partition wall (lower wall) is formed of the diaphragm 5 (diaphragm rubber 51), and the internal volume of the sub liquid chamber 6B is the liquid pressure (internal pressure) in the sub liquid chamber 6B. It changes when the diaphragm 5 (diaphragm rubber 51) deform | transforms by change of.

  The partition member 7 described above is disposed inside the outer cylinder 3, and is interposed between the main liquid chamber 6A and the sub liquid chamber 6B. As shown in FIGS. 1 to 3, the partition member 7 includes a substantially bottomed cylindrical orifice member 70 whose upper end is opened, and a piston 71 that is disposed inside the orifice member 70 so as to be vertically movable. (Corresponding to a movable member in the present invention), a biasing member 72 that biases the piston 71 upward, a lid 73 that covers the upper end opening of the orifice member 70, and a communication hole formed in the lid 73 A check valve 74 that opens and closes 73a and a buffer member 75 disposed on the bottom surface inside the orifice member 70 are provided. In the partition member 7, the main liquid chamber 6 </ b> A side is the upper side, and the sub liquid chamber 6 </ b> B side is the lower side.

  The orifice member 70 is a member fitted inside the outer cylinder 3, and a cylinder chamber 76 (corresponding to a storage chamber in the present invention) that stores the piston 71 is formed in the center portion. The cylinder chamber 76 is a round hole-like space extending in the vertical direction, and has an upper end opened and a lower end closed by a bottom plate portion 78. Inside the cylinder chamber 76, a rod-shaped shaft member 79 erected from the center portion of the bottom plate portion 78 is disposed. The shaft member 79 extends on the central axis of the cylinder chamber 76, and the lower end portion of the shaft member 79 is in a cylindrical bearing portion 80 formed at the center portion of the bottom plate portion 78 of the orifice member 70. It is mated. The bottom plate portion 78 is formed with a plurality of flow holes 87 through which the liquid flows around the bearing portion 80, and the lower portion of the cylinder chamber 76 and the sub liquid chamber 6 </ b> B described above are formed through the flow holes 87. It is communicated.

  At the upper end of the orifice member 70, a press-fit portion 88 is formed in which a peripheral wall portion 73c of a lid body 73 to be described later is press-fitted and fitted from the outside in the radial direction. The press-fit portion 88 has a configuration in which the outer peripheral surface of the upper end portion of the orifice member 70 is reduced in diameter in the radial direction, and is formed over the entire circumference of the orifice member 70.

  Further, a groove 77 extending along the circumferential direction of the cylinder chamber 76 is formed on the radially inner side of the cylinder chamber 76 of the press-fit portion 88 on the upper end surface of the orifice member 70. The groove 77 is a currant having a substantially concave shape in section view with an upper end opened in the direction of the axis L in a longitudinal sectional view (a thinned portion obtained by extracting a part of the orifice member 70). The liquid is the same as the liquid in the chamber 6). The groove 77 is disposed in the central portion in the radial direction of the cylinder chamber 76 on the upper end surface of the orifice member 70, and the entire circumference of the upper end surface of the orifice member 70 except for the main liquid chamber side communication passage 84. It extends with a constant groove depth. The groove 77 is preferably formed in a tapered shape that is gradually widened from the bottom side (lower side) to the opening end side (upper side) in a longitudinal sectional view. Thereby, when forming the above-mentioned groove 77 with a metal mold, the metal mold is easily removed from the groove 77, and the orifice member 70 is easily formed.

  The upper end portion of the orifice member 70 is separated into an outer peripheral portion 70a and an inner peripheral portion 70b by the above-described groove 77, and has a double cylinder structure. The outer peripheral portion 70 a is a substantially cylindrical (C-shaped in a plan view) cylindrical portion provided on the outer side of the groove 77 (outer side in the radial direction of the cylinder chamber 76) in the upper end portion of the orifice member 70. The press-fit portion 88 described above is formed. The inner peripheral portion 70b is a substantially cylindrical (C-shaped in a plan view) cylindrical portion provided on the inner side of the groove 77 (inner side in the radial direction of the cylinder chamber 76) in the upper end portion of the orifice member 70. A cylinder chamber 76 is formed on the radially inner side. Moreover, the inner peripheral part 70b is arrange | positioned through the groove | channel 77 inside the above-mentioned outer peripheral part 70a, and is spaced apart with respect to the outer peripheral part 70a. In addition, the depth H1 of the groove 77 is greater than the press-fitting allowance H2 of the peripheral wall portion 73c of the lid 73 with respect to the orifice member 70 (the length in the axis L direction of the portion of the peripheral wall portion 73c that press-contacts the press-fit portion 88). It is deeper.

  The orifice member 70 is formed with an orifice passage 81 that communicates the main liquid chamber 6A and the sub liquid chamber 6B. The orifice passage 81 is a liquid passage for attenuating the vibration by causing liquid column resonance (resonance phenomenon) in the liquid flowing through the orifice passage 81 when vibration is input to the vibration isolator 1. Shake orifice 81A (corresponding to the second orifice passage of the present invention) tuned to correspond to the frequency and amplitude of shake vibration that is resonance vibration in a low frequency range (for example, 8 Hz to 12 Hz) in the vehicle, and the vehicle. It is divided into an idle orifice 81B (corresponding to the first orifice passage of the present invention) tuned to correspond to the frequency and amplitude of idle vibration in a high frequency range (for example, 20 Hz to 40 Hz) generated during idling operation. Yes.

  More specifically, a first groove 82 extending in the circumferential direction of the orifice member 70 is formed on the outer peripheral surface of the upper portion of the orifice member 70, and the orifice member is formed on the outer peripheral surface of the lower portion of the orifice member 70. A second groove 83 extending in the circumferential direction of 70 is formed. One end of the first groove 82 communicates with the main liquid chamber 6 </ b> A described above via a main liquid chamber side communication passage 84 formed in the upper end portion of the orifice member 70. The main liquid chamber side communication passage 84 has an upper end opened toward the main liquid chamber 6A and a lower end opened toward one end of the first groove 82, and the outer surface (the radial direction of the orifice member 70). The outer surface is closed with a membrane 36. The other end of the first groove 82 communicates with one end of the second groove 83, and the other end of the second groove 83 passes through the sub liquid chamber side communication passage 85 formed in the lower end portion of the orifice member 70. Through the auxiliary liquid chamber 6B. An orifice opening 86 is formed in the inner peripheral portion of the other end of the first groove 82. The orifice opening 86 is a long hole that is long in the circumferential direction of the orifice member 70, and its area is larger than the cross-sectional area of the second groove 83. The other end of the first groove 82 and the lower portion of the cylinder chamber 76 communicate with each other through the orifice opening 86. That is, the shake orifice 81A is formed by the main liquid chamber side communication passage 84, the first groove 82, the second groove 83, and the sub liquid chamber side communication passage 85. The idle orifice 81B is formed by the main liquid chamber side communication passage 84, the first groove 82, the orifice opening 86, the lower portion of the cylinder chamber 76, and the flow hole 87. That is, the idle orifice 81B is an orifice passage that passes through the cylinder chamber 76, and the shake orifice 81A has a larger liquid flow resistance than the idle orifice 81B.

  The piston 71 is a movable member that moves along the inner peripheral surface of the cylinder chamber 76 in accordance with the fluid pressure fluctuation in the main fluid chamber 6 </ b> A and opens / closes (opens / closes) the idle orifice 81 </ b> B, and is accommodated in the cylinder chamber 76. This is a substantially disk-shaped member provided so as to be movable along the shaft member 79. More specifically, the outer peripheral surface of the piston 71 is formed along the inner peripheral surface of the cylinder chamber 76, and a cylindrical portion 71 a into which a shaft member 79 is inserted is provided at the central portion of the piston 71. The piston 71 is disposed above the orifice opening 86 to open the idle orifice 81B (the position shown in FIG. 1), and closes the orifice opening 86 to block the idle orifice 81B (not shown). Z)).

  The urging member 72 is a coil spring that is interposed between the bottom plate portion 78 and the piston 71 in a compressed and deformed state, and is installed in a state in which a precompression force is applied. The lower end portion of the urging member 72 is fitted inside a recess 78 a formed in the central portion of the bottom plate portion 78, and the upper end portion of the urging member 72 is outside the cylindrical portion 71 a of the piston 71. The shaft member 79 is inserted inside the urging member 72.

  The lid body 73 is a member attached to the upper end portion of the orifice member 70, and has a top wall portion 73b having a substantially circular shape in plan view that closes the upper end opening portion of the cylinder chamber 76, and an outer edge portion of the top wall portion 73b. And a substantially cylindrical peripheral wall portion 73c suspended from the center. A fitting hole 73d into which a fitting part 74c of a check valve 74, which will be described later, is fitted is formed in the central portion of the top wall 73b, and a plurality of communication holes 73a are formed around the fitting hole 73c. Is formed. In addition, the inner diameter of the peripheral wall portion 73 c is slightly smaller than the outer diameter of the press-fit portion 88 of the orifice member 70, and the peripheral wall portion 73 c is press-fitted to the outside of the press-fit portion 88. Further, a notch 73e is formed in a portion of the lid 73 corresponding to the above-described main liquid chamber side communication passage 84, and the lid 73 has a shape that does not block the main liquid chamber side communication passage 84. It has become.

  The check valve 74 is a member disposed on the inner side of the lid 73 (below the communication hole 73a). As a schematic configuration, the check valve 74 is disposed on the annular outer peripheral portion 74a and the outer peripheral portion 74a. And a substantially disc-shaped valve body portion 74b that can be elastically deformed, and a fitting portion 74c that is erected from the central portion of the upper surface of the valve body portion 74b. The inner edge part of the outer peripheral part 74a and the outer edge part of the valve body part 74b are connected via a connecting part 74d that can be elastically deformed. The outer peripheral portion 74 a is sandwiched between the upper end surface of the orifice member 70 and the top wall portion 73 b of the lid body 73, and the fitting portion 74 c is fitted into the fitting hole 73 d of the lid body 73. The upper surface of the valve body portion 74b is pressed against the lower surface of the top wall portion 73b of the lid body 73 with a predetermined preload. Further, a recess 74e is formed in the central portion of the lower surface of the valve body 74b, and the upper end of the shaft member 79 is fitted inside the recess 74e.

  The buffer member 75 is an elastic member for alleviating an impact when the piston 71 descends to the bottom of the cylinder chamber 76. The buffer member 75 is formed in an annular shape, and the flow hole 87 of the bottom plate portion 78 is disposed inside the buffer member 75 in plan view.

  Next, a manufacturing process of the vibration isolator 1 having the above configuration will be described.

  First, the process of forming the rubber elastic body 4 between the inner cylinder 2 and the outer cylinder 3 is performed. More specifically, the outer cylinder 3 and the inner cylinder 2 are respectively disposed at predetermined positions in the mold of the rubber elastic body 4, and the entire inner peripheral surface of the outer cylinder 3, the outer peripheral surface of the throttle portion 32 of the outer cylinder 3, An adhesive is applied to the outer peripheral surface of the upper end portion of the small diameter portion 30 of the outer cylinder 3 and the inner peripheral surface of the side opening 35, and the adhesive is applied to the outer peripheral surface of the inner cylinder 2. Thereafter, the rubber elastic body 4 is vulcanized by pouring vulcanized rubber into the mold, and the inner peripheral covering rubber 33, the outer peripheral sealing rubber 34, and the membrane 36 are vulcanized integrally with the rubber elastic body 4, respectively. Mold. Then, the mold is removed after the rubber elastic body 4 and the inner peripheral covering rubber 33 are cured.

On the other hand, the process of assembling the partition member 7 is performed.
More specifically, the lower end portion of the shaft member 79 is fitted to the bearing portion 80 of the orifice member 70 to erect the shaft member 79 in the cylinder chamber 76, and the buffer member 75 is disposed on the bottom surface of the cylinder chamber 76. Thereafter, while the shaft member 79 is inserted inside the urging member 72, the urging member 72 is disposed in the cylinder chamber 76, and the lower end of the urging member 72 is fitted into the recess 78 a of the bottom plate portion 78 of the orifice member 70. .

Subsequently, the piston 71 is arranged in the cylinder chamber 76 while the shaft member 79 is inserted inside the cylinder portion 71 a of the piston 71, and the lower end portion of the cylinder portion 71 a of the piston 71 is placed inside the upper end portion of the biasing member 72. Fit.
On the other hand, the check valve 74 is attached to the lid 73. That is, the fitting portion 74 c of the check valve 74 is fitted into the fitting hole 73 d of the lid body 73, and the check valve 74 is suspended below the top wall portion 73 b of the lid body 73.

Thereafter, the peripheral wall portion 73 c of the lid body 73 is press-fitted into the press-fit portion 88 of the orifice member 70, and the lid body 73 is attached to the upper end of the orifice member 70. At this time, the outer peripheral portion 70a in which the press-fit portion 88 is formed is deformed by stress at the time of press-fitting the peripheral wall portion 73c, and the central axis of the outer peripheral portion 70a is eccentric or the inner peripheral shape of the outer peripheral portion 70a is deformed. . On the other hand, since the inner peripheral portion 70b of the upper end portion of the orifice member 70 is separated from the outer peripheral portion 70a described above, the stress at the time of press-fitting the peripheral wall portion 73c is not easily transmitted to the inner peripheral portion 70b. The peripheral portion 70b is not easily deformed. That is, the deformation of the outer peripheral portion 70a when the peripheral wall portion 73c is press-fitted is absorbed by the groove 77, and the deformation of the inner peripheral portion 70b when the peripheral wall portion 73c is press-fitted is suppressed.
In particular, since the depth H1 of the groove 77 is deeper than the press-fitting allowance H2 of the peripheral wall portion 73c, when the peripheral wall portion 73c is press-fitted into the press-fit portion 88 and the lid body 73 is assembled to the orifice member 70, the peripheral wall The stress during the press-fitting of the portion 73c is reliably absorbed by the groove 77, and the deformation of the inner peripheral portion 70b is more reliably suppressed.

In addition, when the lid 73 fitted with the check valve 74 is attached to the upper end of the orifice member 70, the outer peripheral portion 74 a of the check valve 74 is connected to the upper end surface of the orifice member 70 and the ceiling wall portion 73 b of the lid 73. The valve body portion 74b and the connecting portion 74d of the check valve 74 are elastically deformed, and the upper surface of the valve body portion 74b is pressed against the lower surface of the top wall portion 73b of the lid body 73. Thereby, the communication hole 73a formed in the top wall portion 73b is closed by the valve body portion 74b. At this time, the upper end of the shaft member 79 is fitted inside the recess 74e of the check valve 74, and the upper end of the shaft member 79 is pivotally supported.
Thus, the partition member 7 is assembled.

  Next, a step of fitting the partition member 7 described above inside the outer cylinder 3 is performed. More specifically, the partition member 7 is press-fitted from the lower end side of the outer cylinder 3 into the small diameter portion 30 of the outer cylinder 3. As a result, the openings on the outer peripheral side of the first groove 82, the second groove 83, and the auxiliary liquid chamber side communication path 85 of the orifice member 70 are closed by the inner peripheral covering rubber 33, and the main liquid chamber side communication path 84 The opening on the outer peripheral side is closed by the membrane 36. A main liquid chamber 6 </ b> A is formed between the lower surface of the rubber elastic body 4 and the upper surface of the lid body 73.

  Next, the process of fitting the diaphragm 5 inside the lower end portion of the outer cylinder 3 is performed. More specifically, after the diaphragm ring 50 of the diaphragm 5 is press-fitted inside the lower end portion of the small-diameter portion 30 of the outer cylinder 3, the lower end of the small-diameter portion 30 is reduced in diameter toward the radially inner side to deform the diaphragm ring 50. The outer cylinder 3 is caulked and fixed. Thereby, the lower end of the outer cylinder 3 is closed, and a sub liquid chamber 6 </ b> B is formed between the upper surface of the diaphragm rubber 51 of the diaphragm 5 and the lower surface of the orifice member 70.

  Next, a step of enclosing the liquid in the liquid chamber 6 is performed. More specifically, a liquid is injected into the liquid chamber 6 from a liquid injection port (not shown), the liquid chamber 6 is filled with the liquid, and then the liquid injection port is closed to seal the liquid chamber 6. At this time, since the membrane 36 and the rubber elastic body 4 (inner peripheral covering rubber 33) are integrally formed, the sealing performance of the membrane 36 is improved, and the side opening 35 of the outer cylinder 3 is formed by the membrane 36. It is securely blocked.

  Next, a step of press-fitting the outer cylinder 3 into the holder portion 11 of the vehicle body side bracket 10 is performed. As a result, the large diameter portion 31 of the outer cylinder 3 is disposed inside the small diameter portion 13 of the holder portion 11, and the outer peripheral surface of the outer peripheral seal rubber 34 of the outer cylinder 3 is aligned with the inner peripheral surface of the small diameter portion 13 of the holder portion 11. The upper side of the gap S formed between the inner peripheral surface of the large-diameter portion 14 of the holder portion 11 and the outer peripheral surface of the outer cylinder 3 (the outer surface of the membrane 36) is closed.

  Next, a process of fitting the seal member 9 between the outer peripheral surface of the outer cylinder 3 and the inner peripheral surface of the holder portion 11 is performed. More specifically, the seal member 9 is inserted between the outer peripheral surface of the outer tube 3 and the inner peripheral surface of the holder portion 11 from the lower end side of the outer tube 3. The sealing member 9 seals the lower side of the gap S formed on the outside of the membrane 36 and prevents the outside air from entering the gap S.

  Next, the operation of the above-described vibration isolator 1 will be described.

  In the vibration isolator 1 having the above-described configuration, vibration from the engine in the vehicle is transmitted to the inner cylinder 2 via an engine-side bracket (not shown), and further transmitted from the inner cylinder 2 to the rubber elastic body 4. 4 is elastically deformed. At this time, the rubber elastic body 4 acts as a vibration absorbing main body, and the vibration is absorbed by the vibration absorbing action based on the internal friction of the rubber elastic body 4 and transmitted from the outer cylinder 3 to the vehicle body side via the vehicle body side bracket 10. Vibration is reduced.

Further, when a shake vibration having a relatively low frequency and a large amplitude is input to the above-described vibration isolator 1, the rubber elastic body 4 is elastically deformed by the shake vibration and is relatively moved into the main liquid chamber 6A. A large fluid pressure change occurs, and the fluid pressure in the main fluid chamber 6A periodically repeats large elevations.
At this time, when the fluid pressure in the main fluid chamber 6A is periodically increased, the fluid pressure in the main fluid chamber 6A is larger than the fluid pressure in the upper chamber of the cylinder chamber 76 (cylinder chamber above the piston 71). Therefore, the valve body 74b of the check valve 74 is pushed down against the preload, and the communication hole 73a of the lid 73 is opened. At this time, since the hydraulic pressure in the upper chamber of the cylinder chamber 76 becomes larger than the urging force (precompression force) of the urging member 72, the piston 71 is pushed down against the urging force of the urging member 72. As a result, the orifice opening 86 of the orifice member 70 is closed by the piston 71, and the idle orifice 81B is blocked. As a result, the liquid in the liquid chamber 6 flows from the main liquid chamber 6A side through the shake orifice 81A to the sub liquid chamber 6B side as the liquid pressure in the main liquid chamber 6A increases.

  On the other hand, when the fluid pressure in the main fluid chamber 6A is periodically reduced, the fluid pressure in the main fluid chamber 6A is smaller than the fluid pressure in the upper chamber of the cylinder chamber 76. The valve body 74 b of the check valve 74 is pressed against the top wall 73 b of the lid 73 by the pressure, and the communication hole 73 a of the lid 73 is closed. As a result, the state where the piston 71 is pushed down by the hydraulic pressure in the upper chamber of the cylinder chamber 76 is maintained, and the orifice opening 86 of the orifice member 70 is closed by the piston 71 and the idle orifice 81B remains blocked. . As a result, the liquid in the liquid chamber 6 flows from the sub liquid chamber 6B side through the shake orifice 81A to the main liquid chamber 6A side as the liquid pressure in the main liquid chamber 6A decreases.

  Since the shake orifice 81A is tuned to cope with shake vibration, as described above, the liquid in the liquid chamber 6 passes between the main liquid chamber 6A and the sub liquid chamber 6B through the shake orifice 81A. In doing so, liquid column resonance occurs in the liquid flowing through the shake orifice 81A. For this reason, the shake vibration input to the vibration isolator 1 is attenuated by the liquid column resonance in the shake orifice 81A, and the shake vibration transmitted to the vehicle body side is reduced.

Further, when an idle vibration having a relatively high frequency and a small amplitude is input to the vibration isolator 1 described above, the rubber elastic body 4 is elastically deformed by the idle vibration and is relatively moved into the main liquid chamber 6A. A small fluid pressure change occurs, and the fluid pressure in the main fluid chamber 6A repeats a small increase and decrease periodically. At this time, when the fluid pressure in the main fluid chamber 6A is periodically increased, the fluid pressure in the main fluid chamber 6A becomes larger than the fluid pressure in the upper chamber of the cylinder chamber 76. Since no force is generated to push down 74 b, the valve body 74 b of the check valve 74 keeps being pressed against the top wall 73 b of the lid 73 by the preload, and the communication hole 73 a of the lid 73 is formed. Stay blocked. As a result, the piston 71 is kept biased upward by the biasing force of the biasing member 72, the orifice opening 86 of the orifice member 70 is opened, and the idle orifice 81B is opened. At this time, both the shake orifice 81A and the idle orifice 81B are in a state where the liquid can flow (open state), but the idle orifice 81B has a lower flow resistance of the liquid than the shake orifice 81A. The liquid flows preferentially toward the idle orifice 81B. Accordingly, the liquid in the liquid chamber 6 moves between the main liquid chamber 6A and the sub liquid chamber 6B through the idle orifice 81B in accordance with the change in the liquid pressure in the main liquid chamber 6A.
It should be noted that when the fluid pressure in the main fluid chamber 6A is periodically reduced, the fluid pressure in the main fluid chamber 6A is smaller than the fluid pressure in the upper chamber of the cylinder chamber 76. Due to the pressure, the valve body 74 b of the check valve 74 is pressed against the top wall 73 b of the lid 73, the communication hole 73 a of the lid 73 remains blocked by the check valve 74, and the orifice opening of the orifice member 70 86 is opened and the idle orifice 81B is opened.

  Since the idle orifice 81B is tuned to cope with idle vibration, the liquid in the liquid chamber 6 travels between the main liquid chamber 6A and the sub liquid chamber 6B through the idle orifice 81B as described above. When doing so, liquid column resonance occurs in the liquid flowing through the idle orifice 81B. For this reason, the idle vibration input to the vibration isolator 1 is attenuated by the liquid column resonance in the idle orifice 81B, and the idle vibration transmitted to the vehicle body side is reduced.

  Further, in the above-described vibration isolator 1, after a large vibration is input in the bounce direction and the liquid pressure in the main liquid chamber 6A suddenly increases, vibration is input in the rebound direction and the main liquid chamber 6A becomes a negative pressure. Even if an abrupt fluid pressure drop locally occurs in the main fluid chamber side communication passage 84, the rapid fluid pressure drop is absorbed by the membrane 36.

  According to the vibration isolator 1 having the above-described configuration, the deformation of the outer peripheral portion 70a when the peripheral wall portion 73c of the lid body 73 is press-fitted into the press-fit portion 88 of the orifice member 70 is absorbed by the groove 77, and the peripheral wall portion 73c Since deformation of the inner peripheral portion 70b at the time of press-fitting is suppressed, when the lid 73 is assembled to the orifice member 70, the center axis of the cylinder chamber 76 is decentered or the inner peripheral shape of the cylinder chamber 76 is deformed. Can be prevented. Thereby, piston 71 can be operated smoothly and the vibration isolator 1 can be functioned appropriately. Further, the clearance between the outer peripheral surface of the piston 71 and the inner peripheral surface of the cylinder chamber 76 is appropriately secured, and interference between the outer peripheral surface of the piston 71 and the inner peripheral surface of the cylinder chamber 76 is avoided. The wear of the surface and the inner peripheral surface of the cylinder chamber 76 can be suppressed, and the durability of the vibration isolator 1 can be improved.

  Further, according to the vibration isolator 1 described above, the depth H1 of the groove 77 is deeper than the press-fitting allowance H2 of the peripheral wall portion 73c, and the stress at the time of press-fitting the peripheral wall portion 73c is reliably absorbed by the groove 77, Since the deformation of the inner peripheral portion 70b is more reliably suppressed, the eccentricity of the cylinder chamber 76 and the deformation of the inner peripheral shape of the cylinder chamber 76 can be prevented more reliably, and the piston 71 can be operated more reliably and smoothly. Can do.

[Second Embodiment]
Next, a second embodiment according to the present invention will be described with reference to FIG.
FIG. 4 is a cross-sectional view of the vibration isolator 1 in the present embodiment.
In addition, about the structure similar to 1st embodiment mentioned above, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  In the partition member 7 according to the present embodiment, a check valve that opens and closes the communication hole 73a formed in the lid 73 and allows the liquid to flow only in the direction from the main liquid chamber 6A to the cylinder chamber 76. On the other hand, a check valve 174 made of a substantially disk-shaped elastic body arranged vertically is provided. Convex portions 174a and 174b are formed on the upper and lower surfaces of the central portion of the check valve 174, respectively. The check valve 174 gradually decreases in thickness from the central axis L toward the radially outer side, and at least the upper surface of the check valve 174 is inclined downward toward the radially outer side. Of the above-described convex portions 174a and 174b, the upper convex portion 174a is fitted in a fitting hole 73d formed in the lid 73, and the lower convex portion 174b is a non-return check described later. The valve receiving member 190 is fitted in the recess 194.

  The partition member 7 in the present embodiment is provided with a check valve receiving member 190 for supporting the check valve 174 described above. The check valve receiving member 190 is a saucer-like plate on which the check valve 174 is placed. More specifically, the check valve receiving member 190 includes a bottom plate portion 191 having a substantially circular shape in a plan view arranged perpendicular to the axis L, a peripheral wall portion 192 erected from an outer edge portion of the bottom plate portion 191, and a peripheral wall portion. And a flange portion 193 projecting radially outward from the upper end of 192. A concave portion 194 into which the lower convex portion 174b of the check valve 174 described above is fitted is formed in the central portion of the bottom plate portion 191. The bottom plate portion 191 has a plurality of through-holes 195 around the recess 194 in plan view. The check valve receiving member 190 having the above-described configuration is disposed below the lid body 73, and the check valve 174 is disposed and sandwiched between the check valve receiving member 190 and the lid body 73. The check valve receiving member 190 described above is fitted in the cylinder chamber 76 and functions as a holding member for holding the inner peripheral shape of the cylinder chamber 76. That is, the peripheral wall portion 192 is fitted in the cylinder chamber 76, and the flange portion 193 is placed on the upper end surface of the orifice member 70 so that the upper end surface of the orifice member 70 and the top wall portion 73 b of the lid body 73 are formed. It is sandwiched between the lower surface.

  In the vibration isolator 1 including the partition member 7 described above, the check valve receiving member 190 is fitted to the upper end portion of the cylinder chamber 76 before the lid 73 is attached to the orifice member 70. Thereby, the inner peripheral surface of the cylinder chamber 76 is pressed from the inside of the cylinder chamber 76, and the shape of the inner peripheral surface of the cylinder chamber 76 is maintained. Thereafter, the peripheral wall portion 73 c of the lid body 73 is press-fitted into the press-fit portion 88 of the orifice member 70, and the lid body 73 is attached to the upper end of the orifice member 70. At this time, since the inner peripheral portion 70b at the upper end of the orifice member 70 is separated from the outer peripheral portion 70a by the groove 77, the stress when the peripheral wall portion 73c is press-fitted is transmitted to the inner peripheral portion 70b. The inner peripheral portion 70b is not easily deformed. Furthermore, as described above, since the inner peripheral surface of the cylinder chamber 76 is pressed from the inside of the cylinder chamber 76 by the check valve receiving member 190, the deformation of the inner peripheral portion 70b is reliably suppressed.

  According to the vibration isolator 1 having the above-described configuration, the deformation of the inner peripheral portion 70b is reliably suppressed, so that the center axis of the cylinder chamber 76 is decentered or the inner peripheral shape of the cylinder chamber 76 is deformed. Therefore, the piston 71 can be operated more reliably and smoothly, and the vibration isolator 1 can function properly.

[Third embodiment]
Next, a third embodiment according to the present invention will be described with reference to FIG.
FIG. 5 is an exploded perspective view of the partition member 7 in the present embodiment.
In addition, about the structure similar to 1st, 2nd embodiment mentioned above, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  A plurality of concave notches 173e are formed in the peripheral wall 173c of the lid 173 in the present embodiment. The plurality of notches 173e are arranged at equal intervals along the circumferential direction of the peripheral wall 173c. That is, a plurality of peripheral wall pieces 173f and a plurality of cutout portions 173e are alternately arranged on the outer edge portion of the top wall portion 173b of the lid 173. In FIG. 5, the four peripheral wall pieces 173f are evenly arranged. It is installed. One of the plurality of notches 173e described above is formed at a position corresponding to the main liquid chamber side communication passage 84.

  In the vibration isolator 1 including the lid 173 described above, the plurality of notches 173e are formed in the peripheral wall 173c of the lid 173. Therefore, the peripheral wall 173c of the lid 173 is connected to the press-fit portion 88 of the orifice member 70. When the lid 173 is attached to the upper end of the orifice member 70 by press-fitting to the upper end of the orifice member 70, the press-fit stress acting on the outer peripheral portion 70a of the upper end portion of the orifice member 70 is reduced. In addition, since the plurality of notches 173e described above are arranged at equal intervals in the circumferential direction, the press-fitting stress acts equally on the outer peripheral portion 70a, and the relative positioning between the lid 173 and the orifice member 70 is achieved. Is easier to do.

According to the vibration isolator 1 having the above-described configuration, stress at the time of press-fitting of the peripheral wall portion 73c of the lid 73 is reduced. Therefore, when the lid 73 is assembled to the orifice member 70, the cylinder chamber 76 is eccentric or deformed. Can be prevented more reliably.
In particular, the plurality of notches 173e are arranged at equal intervals in the circumferential direction, and the press-fitting stress acts evenly on the outer peripheral portion 70a, so that the eccentricity and deformation of the cylinder chamber 76 are less likely to occur, and the shape of the cylinder chamber 76 is reduced. Etc. can be kept more reliably. Further, since the plurality of cutout portions 173e are arranged at equal intervals in the circumferential direction, the relative positioning between the lid 173 and the orifice member 70 is facilitated, and therefore the vibration isolator 1 (the partition member 7). ) Can be facilitated, and mass productivity can be improved.

  In the above-described embodiment, the groove 77 formed on the upper end surface of the orifice member 70 is formed over the entire circumference. However, as described above, a plurality of notches are formed in the peripheral wall portion 173c of the lid 173. When the portion 173e is formed, a groove can be formed only at a position corresponding to the peripheral wall piece 173f formed between the cutout portions 173e. That is, the groove on the upper end surface of the orifice member 70 can be intermittently formed in the circumferential direction.

As mentioned above, although the embodiment of the vibration isolator according to the present invention has been described, the present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the gist thereof.
For example, in the above-described embodiment, an engine (not shown) that is a vibration generation source is connected to the inner cylinder 2 via an engine side bracket, and a vehicle body (not shown) that is a vibration receiving portion is connected to the outer cylinder 3 on the vehicle body side. In the present invention, the vibration receiving portion is connected to the inner cylinder 2 (mounting member), and the vibration generating source is connected to the outer cylinder 3 (cylinder member) via the bracket 10. May be.

  Moreover, although the above-described embodiment describes the vibration isolator 1 that is applied as an engine mount of a vehicle, the vibration isolator according to the present invention can be applied to other than the engine mount. For example, the vibration isolator according to the present invention can be applied as a mount of a generator mounted on a construction machine, or can be applied as a mount of a machine installed in a factory or the like.

  Further, in the above-described embodiment, the inner cylinder 2 is disposed coaxially with the outer cylinder 3, and a bolt (not shown) is screwed onto the female thread portion 2 a of the inner cylinder 2 so that the engine (not shown) is attached to the inner cylinder 2. Although the configuration is such that the side bracket is attached, the present invention may be configured such that the press-fit portion of the engine-side bracket is press-fitted inside the inner cylinder 2. Further, the inner cylinder 2 extends in a direction perpendicular to the outer cylinder 3, and a bolt of an engine side bracket (not shown) is inserted inside the inner cylinder 2 and mechanically fixed with a nut or the like. Good. Furthermore, the present invention is not limited to a cylindrical mounting member, and for example, the mounting member may have a configuration in which a bolt protrudes and may be configured to be mounted on an engine side bracket or the like with the bolt.

  In the above-described embodiment, the orifice member 70 is formed with the shake orifice 81A and the idle orifice 81B, respectively, the partition member 7 is biased with the biasing member 72, the lid 73, And check valves 74 and 174 for opening and closing communication holes 73a and 173a formed in 173. The piston 71 reciprocates due to the fluid pressure in the main fluid chamber 6A and the urging force of the urging member 72. Although configured, the present invention is not limited to the hydraulic pressure switching type vibration isolator 1 as described above. For example, the piston 71 may be configured to reciprocate by a mechanical drive mechanism such as a motor. In this case, the piston 71 can be reciprocated without using the check valve 74 or the urging member 72.

  In the above-described embodiment, the piston 71 that reciprocates in the direction of the axis L along the inner peripheral surface of the cylinder chamber 76 is provided as a movable member that operates in accordance with a change in the hydraulic pressure in the main fluid chamber 6A. However, in the present invention, the partition member 7 is not provided with the piston 71, and a movable film (movable membrane) accommodated in the cylinder chamber 76 can be used as the movable member. For example, the above-described check valve 74 can be the above-described movable film, and the check valve 74 can be operated smoothly by suppressing the eccentricity and deformation of the cylinder chamber 76. The opening and closing of the communication hole 73a of the lid 73 by 74 is performed appropriately.

  Further, in the above-described embodiment, the press-fit portion 88 is formed on the outer periphery of the outer peripheral portion 70a at the upper end portion of the orifice member 70, and the peripheral wall portion 73c of the lid 73 is press-fitted and fitted to the outside of the outer peripheral portion 70a. However, the present invention can also be configured such that the press-fit portion 88 is formed on the inner periphery of the outer peripheral portion 70a, and the peripheral wall portion 73c of the lid 73 is press-fitted to the inner periphery of the outer peripheral portion 70a. is there.

  In the second embodiment described above, the check valve 174 is provided between the lid 73 and the holding member that is fitted inside the upper end of the cylinder chamber 76 and holds the inner peripheral shape of the cylinder chamber 76. Although the check valve receiving member 190 that is disposed and supports the check valve 174 is provided, the present invention does not support the check valve 74 and is fitted to the inside of the upper end portion of the cylinder chamber 76 to be a cylinder. A holding member that holds the inner peripheral shape of the chamber 76 may be provided. For example, although the check valve 174 is not provided, a holding member may be fitted to the upper end portion of the cylinder chamber 76.

  In the third embodiment described above, the plurality of cutout portions 173e formed in the peripheral wall portion 173c of the lid 173 are evenly arranged in the circumferential direction. It is also possible to dispose the portions 173e unevenly in the circumferential direction.

  In addition, the constituent elements in the above-described embodiment can be appropriately replaced with known constituent elements without departing from the gist of the present invention, and each of the above-described embodiments and modifications may be appropriately combined. Good.

It is sectional drawing of the vibration isolator for demonstrating 1st embodiment of this invention. It is sectional drawing of the partition member for demonstrating 1st embodiment of this invention. It is a disassembled perspective view of the partition member for demonstrating 1st embodiment of this invention. It is sectional drawing of the vibration isolator for demonstrating 2nd embodiment of this invention. It is a disassembled perspective view of the partition member for demonstrating 3rd embodiment of this invention.

Explanation of symbols

1 Antivibration device 2 Inner cylinder (mounting member)
3 Outer cylinder (cylinder member)
4 Rubber elastic body 5 Diaphragm 6 Liquid chamber 6A Main liquid chamber 6B Sub liquid chamber 7 Partition member 70 Orifice member 70a Outer peripheral portion 70b Inner peripheral portion 71 Piston (movable member)
73 Lid 73a Communication hole 73b Top wall 73c Peripheral wall 74 Check valve 76 Cylinder chamber (accommodating chamber)
77 Groove 81 Orifice passage 81A Shake orifice (second orifice passage)
81B Idle orifice (first orifice passage)
88 Press-fit part 190 Check valve receiving member

Claims (7)

A cylindrical member connected to any one of the vibration generating unit and the vibration receiving unit;
An attachment member connected to any one of the vibration generating portion and the vibration receiving portion;
A rubber elastic body that elastically connects the cylindrical member and the mounting member and closes one open end of the cylindrical member;
A diaphragm for closing the other open end of the cylindrical member;
A liquid chamber formed inside the cylindrical member and enclosing a liquid, a main liquid chamber in which a part of the partition wall is formed of the rubber elastic body, and the internal volume changes due to deformation of the rubber elastic body, and a partition wall A partition member that is partitioned into a sub-liquid chamber, a part of which is formed of the diaphragm,
In a vibration isolator comprising:
In the partition member,
An orifice passage that is fitted inside the cylindrical member and communicates the main liquid chamber and the secondary liquid chamber, and a storage chamber that extends along the central axis direction of the cylindrical member and that is open at least on one side, respectively. An orifice member formed;
A lid that has a top wall portion that covers an opening end on one side of the storage chamber, and a peripheral wall portion that hangs from the top wall portion, and is attached to an end portion of the orifice member on the main liquid chamber side Body,
A movable member that is housed inside the housing chamber and that operates in accordance with a change in hydraulic pressure of the main liquid chamber;
Is provided,
At the end of the orifice member on the main liquid chamber side, a press-fit portion into which the peripheral wall portion is press-fitted is formed around the storage chamber,
A groove extending along the circumferential direction of the storage chamber is formed inside the storage chamber radial direction of the press-fitting portion on the end surface of the orifice member on the main liquid chamber side,
Of the end of the orifice member on the main liquid chamber side, the press-fit portion is formed on the outer peripheral portion provided on the outer side of the groove in the housing chamber radial direction, and provided on the inner side of the groove in the housing chamber radial direction. The anti-vibration device is characterized in that the inner peripheral portion is separated from the outer peripheral portion. The vibration isolator according to claim 1, wherein
In the orifice member, as the orifice passage, a first orifice passage that passes through the storage chamber and a second orifice passage having a larger liquid flow resistance than the first orifice passage are formed, respectively.
Inside the storage chamber, a piston that moves as the movable member along the inner peripheral surface of the storage chamber according to the fluid pressure fluctuation of the main liquid chamber and opens and closes the first orifice passage is stored. An anti-vibration device characterized by that. The vibration isolator according to claim 1 or 2,
A vibration isolator, wherein a holding member for holding the inner peripheral shape of the storage chamber is fitted inside the opening end of the storage chamber on the main liquid chamber side. The vibration isolator according to claim 3,
The lid is formed with a communication hole that communicates the main liquid chamber and the storage chamber.
The partition member is provided inside the storage chamber, and includes a check valve that opens and closes the communication hole to flow the liquid only in the direction from the main liquid chamber to the storage chamber.
A check valve receiving member that supports the check valve by placing the check valve between the lid and the lid is fitted inside the opening end of the storage chamber on the main liquid chamber side. A vibration isolator characterized by being combined. In the vibration isolator in any one of Claim 1 to 4,
The anti-vibration device according to claim 1, wherein a depth of the groove is deeper than a press-fitting allowance of the peripheral wall portion to the orifice member. In the vibration isolator in any one of Claim 1 to 4,
The vibration isolator having a plurality of notches formed in the peripheral wall portion. The vibration isolator according to claim 6,
The vibration-proof device, wherein the plurality of notches are arranged at equal intervals along the circumferential direction of the peripheral wall.

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