JP6207280B2 - Fluid filled vibration isolator - Google Patents

Description

  The present invention relates to a fluid-filled vibration isolator used for, for example, an automobile engine mount, and more particularly to a multidirectional vibration isolator capable of obtaining a vibration isolating effect with respect to vibration inputs in the axial direction and the direction perpendicular to the axis. The present invention relates to a type of fluid-filled vibration isolator.

  2. Description of the Related Art Conventionally, as a type of vibration isolator used for an engine mount of an automobile, a fluid-filled vibration isolator using a vibration isolating effect that is exhibited based on the flow action of an incompressible fluid sealed inside is known. It has been. Furthermore, in addition to the anti-vibration effect with respect to the axial input, a multi-directional anti-vibration type fluid-filled anti-vibration device has been proposed that exhibits an anti-vibration effect with respect to the input in the direction perpendicular to the axis. In this multi-directional vibration-proof fluid-filled vibration isolator, the inner shaft member is inserted into the outer cylinder member and elastically connected by the main rubber elastic body, and the partition member supported by the outer cylinder member is sandwiched A main liquid chamber and a sub liquid chamber are formed on both sides, and an incompressible fluid is sealed in the main liquid chamber and the sub liquid chamber, and the first orifice that communicates the main liquid chamber and the sub liquid chamber with each other A passage is formed. Further, the main rubber elastic body is formed with a pair of cavities that open to the outer peripheral surface, and a pair of axial straight liquid chambers are formed by closing the openings of the cavities with the outer cylinder member. An incompressible fluid is sealed in the axial straight liquid chamber, and a second orifice passage is formed to communicate the pair of axial direct liquid chambers with each other. An example of a multi-directional vibration-proof fluid-filled vibration isolator is JP-A-2002-227912 (Patent Document 1).

  By the way, in the fluid-filled vibration isolator described in Patent Document 1, the upper and lower inner wall surfaces of the axial straight liquid chamber are shaped so as to expand upward and downward toward the outer peripheral side. Thus, a relative pressure fluctuation between the axial liquid chambers is efficiently induced. As a result, the upper rubber arm of the main rubber elastic body constituting the upper wall portion of the axial straight liquid chamber is shaped to be inclined upward toward the outer peripheral side, and the upper rubber arm is subjected to tensile deformation by the downward input in the axial direction. It tends to occur.

  Therefore, a multi-directional vibration-proof fluid-filled vibration isolator as shown in Patent Document 1 is generally arranged so that a downward static support load such as a shared support load of a power unit does not act. However, even in a fluid-filled vibration isolator to which a downward support load is input, a vibration-proof effect can be required in multiple directions. It is also considered to be applied to the case.

  However, with respect to the fluid-filled vibration isolator having the conventional structure described in Patent Document 1, a dynamic axial load such as an engine shake is further lowered in a state where a downward static support load is input. When input, an excessive tensile stress is exerted on the upper rubber arm, and the durability of the upper rubber arm may not be sufficiently ensured.

  In the fluid-filled vibration isolator described in Patent Document 1, the outer peripheral surface of the main rubber elastic body is molded by a molding die that is divided in the opposing direction of the pair of axial liquid chambers. Considering removal of the mold after molding, the inner surfaces of the upper and lower walls of the axial straight liquid chamber need to be inclined surfaces that expand toward the outer peripheral side or flat surfaces that extend in the direction perpendicular to the axis. Therefore, when a downward static support load is input between the inner shaft member and the outer cylinder member, it is difficult to avoid applying a tensile stress to the upper rubber arm.

  Further, in the fluid-filled vibration isolator of Patent Document 1, the upper rubber arm and the lower rubber arm are connected by a thin rubber elastic body at the inner peripheral end in the formation portion of the pair of axial straight liquid chambers, At the outer peripheral edge, they are separated vertically. As described above, in the structure in which the upper and lower rubber arms are substantially independent, it is difficult to distribute stress between the upper rubber arm and the lower rubber arm with respect to the input of the load, and the durability can be ensured. More difficult. In addition, since the upper and lower rubber arms are separated from each other at the outer peripheral edge over a wide range on the circumference and are fixed to the intermediate sleeves separately, the occurrence of peeling or cracking may be a problem. .

JP 2002-227912 A

  The present invention has been made in the background of the above-mentioned circumstances, and the problem to be solved is that the durability of the main rubber elastic body is ensured with respect to the axially downward load input, and the input in the direction perpendicular to the axis is ensured. It is an object of the present invention to provide a fluid-filled vibration isolator having a novel structure capable of obtaining excellent vibration isolating performance.

  Hereinafter, the aspect of this invention made | formed in order to solve such a subject is described. In addition, the component employ | adopted in each aspect as described below is employable by arbitrary combinations as much as possible.

That is, according to the first aspect of the present invention, the inner shaft member is inserted into the outer cylindrical member and elastically connected by the main rubber elastic body, and the partition member supported by the outer cylindrical member is sandwiched between the upper and lower sides. A main liquid chamber and a sub liquid chamber are formed, and the main liquid chamber and the sub liquid chamber are communicated with each other through a first orifice passage. And a pair of axial direct liquid chambers are formed by covering the openings of the voids with the outer cylindrical member, and a second axial direct liquid chamber is connected to each other. In the fluid-filled vibration isolator in which the orifice passage is formed, the inner shaft member has an inclined shape in which both the upper wall inner surface and the lower wall inner surface of the shaft direct liquid chamber are inclined upward toward the inner peripheral side. Between the outer cylinder member and the outer cylindrical member The upper rubber arm of the main rubber elastic body constituting the upper wall portion of the axial direct liquid chamber and the lower rubber of the main rubber elastic body constituting the lower wall portion of the axial direct liquid chamber when the weight is input Each of the arms is configured to be compressed, and the pair of voids in the main rubber elastic body extend in parallel to the direction perpendicular to the axis, and the inner peripheral side of the void in the main rubber elastic body Is provided with an inner peripheral connecting portion for connecting the upper rubber arm and the lower rubber arm to each other at the inner peripheral end, and the upper rubber is provided on the outer peripheral side of the void in the main rubber elastic body. While the outer peripheral connecting portion for connecting the arm and the lower rubber arm to each other at the outer peripheral end is provided, the pair of cavities are respectively tunnel-like through holes penetrating the main rubber elastic body, The outer wall portion of the tunnel-shaped through hole is constituted by the outer peripheral connecting portion, and A single-piece intermediate sleeve is fixed to the outer peripheral surface of the elastic body including the outer peripheral connecting portion, and the pair of voids of the main rubber elastic body are opened to the outer circumference through windows provided in the intermediate sleeve. In addition, an orifice member arranged on the outer peripheral surface of the intermediate sleeve so as to straddle the window portion in the circumferential direction is intermediate in the circumferential direction by the intermediate sleeve fixed to the outer peripheral surface of the outer peripheral connection portion. while being supported portion, upper portion of the inner shaft member protrudes from the axial opening of the outer tubular member, together with the inner circumferential surface of the upper rubber arm is fixed to the upper portion of the inner shaft member The lower part of the inner shaft member is inserted into the outer cylinder member and extends to between the pair of shaft direct liquid chambers, and the inner peripheral surface of the lower rubber arm is fixed to the lower part of the inner shaft member. It is characterized by being.

  According to the fluid-filled vibration isolator described in the first aspect, both the upper rubber arm and the lower rubber arm of the main rubber elastic body are compressed with respect to the downward load input. Therefore, even when a static load such as a shared support load of the power unit is input downward, the tensile stress on the main rubber elastic body is prevented and the durability is improved. In particular, since the upper wall inner surface and the lower wall inner surface of the axial straight liquid chamber are inclined so as to gradually incline toward the inner circumference, cracks due to the action of tensile stress on the upper wall inner surface and the lower wall inner surface are formed. Generation | occurrence | production etc. are avoided and durability is ensured.

  Further, since the inner peripheral end and the outer peripheral end of the upper rubber arm and the lower rubber arm sandwiching the axial direct liquid chamber are connected to each other by the inner peripheral connecting portion and the outer peripheral connecting portion, Dispersion of stress is more advantageously achieved between the lower rubber arms, and durability is improved. In addition, since the inner peripheral connecting portion and the outer peripheral connecting portion are provided, the surface of the main rubber elastic body constituting the wall inner surface of the axial direct liquid chamber is secured larger. The stress is dispersed in a wider range on the inner surface, and the durability is more effectively improved.

Furthermore, the upper rubber arm of the main rubber elastic body is fixed to the upper portion of the inner shaft member, and the lower rubber arm is fixed to the lower portion of the inner shaft member. A large axial dimension of the portion is secured. As a result, the upper rubber arm and the lower rubber arm can be tilted upward toward the inner circumference at a larger angle, thereby improving the load resistance against a downward load input.
In addition, the upper part of the inner shaft member protrudes upward from the outer cylinder member, and the lower part of the inner shaft member is inserted into the outer cylinder member and extends between the pair of shaft direct liquid chambers. This ensures a large axial dimension at the inner peripheral end of the main rubber elastic body and efficiently produces a relative pressure fluctuation between the pair of axial liquid chambers with respect to the input in the direction perpendicular to the axis. Thus, the vibration isolation effect based on the fluid flow action is effectively exhibited.

In addition, according to this aspect, the inner surface shape of the through hole can be molded with a higher degree of freedom by inserting a molding die that is opened and closed in the length direction of the through hole from both sides. In addition, it is possible to eliminate the positioning of the main rubber elastic body in the circumferential direction by setting the through-holes so that they have the same shape even if rotated 180 ° in the circumferential direction.
In the second aspect of the present invention, the inner shaft member is inserted into the outer cylinder member and elastically connected by the main rubber elastic body, and the main liquid is disposed on both upper and lower sides with the partition member supported by the outer cylinder member interposed therebetween. A chamber and a sub liquid chamber are formed, and the main liquid chamber and the sub liquid chamber are communicated with each other by a first orifice passage, while the main rubber elastic body has a pair of cavities that open to the outer peripheral surface. A second orifice passage formed so that the openings of the voids are covered with the outer cylindrical member to form a pair of axial direct liquid chambers, and the pair of axial direct liquid chambers communicate with each other. In the fluid-filled type vibration damping device formed with the inner shaft member and the inner shaft member, the inner surface of the shaft direct liquid chamber and the inner surface of the lower wall are inclined so as to incline toward the inner peripheral side. A downward load in the axial direction is input between the outer cylinder members. The upper rubber arm of the main rubber elastic body constituting the upper wall portion of the axial direct liquid chamber and the lower rubber arm of the main rubber elastic body constituting the lower wall portion of the axial direct liquid chamber Are compressed, and the pair of voids in the main rubber elastic body extend parallel to the direction perpendicular to the axis, and the upper side is disposed on the inner peripheral side of the void in the main rubber elastic body. An inner peripheral connecting portion for connecting the rubber arm and the lower rubber arm at the inner peripheral end is provided, and the upper rubber arm and the lower rubber arm are disposed on the outer peripheral side of the void in the main rubber elastic body. while the outer peripheral connecting portion interconnecting the side rubber arm at the outer peripheral edge is provided, on the outer peripheral surface of the main rubber elastic body is fixed intermediate sleeve, a pair of windows provided in the intermediate sleeve Are disposed within a half circumference on the circumference of the intermediate sleeve, and the pair of cavities The recesses are open in the same direction perpendicular to the axis, and the pair of cavities open to the window part, while the intermediate sleeve has a circumferential groove extending in the circumferential direction while opening to the outer peripheral surface. The second orifice passage is formed by covering the outer peripheral opening of the circumferential groove with the outer cylinder member , and the upper part of the inner shaft member is the shaft of the outer cylinder member. And the inner peripheral surface of the upper rubber arm is fixed to the upper part of the inner shaft member, and the lower part of the inner shaft member is inserted into the outer cylinder member so that the pair of shafts It extends between the liquid chambers, and the inner peripheral surface of the lower rubber arm is fixed to the lower portion of the inner shaft member.
In the second aspect of the present invention, the following effects can be exhibited in addition to the effects described in the above [0012] to [0014].
That is, according to the second aspect, the opening direction of the window portion and the void is set within a half of the circumference, and the circumferential groove is provided in the intermediate sleeve on the side opposite to the opening direction of the window portion and the void. Thus, the second orifice passage can be formed using the circumferential groove without requiring a special orifice member. Therefore, the number of parts can be reduced, and a multi-directional vibration-proof fluid-filled vibration isolator capable of obtaining an anti-vibration effect in the direction perpendicular to the axis can be realized with a simple structure.

According to a third aspect of the present invention, in the fluid-filled vibration isolator described in the first or second aspect, the inclination angle of the inner surface of the lower wall is larger than the inclination angle of the upper wall inner surface of the axial straight liquid chamber. It is what has been.

According to the third aspect, the area of the inner surface of the lower wall, which is the upper surface of the lower rubber arm, is ensured to be large, and the free length of the lower rubber arm is increased, so that the durability of the lower rubber arm is advantageous. Secured. Furthermore, since the inclination angle of the inner surface of the upper wall is smaller than the inclination angle of the inner surface of the lower wall, relative pressure fluctuations of the pair of axial straight liquid chambers are efficiently induced with respect to the input in the direction perpendicular to the axis. Thus, the desired vibration-proofing effect is exhibited advantageously.

According to a fourth aspect of the present invention, in the fluid-filled vibration isolator described in any one of the first to third aspects, the upper wall inner surface of the axial direct liquid chamber has a concave curved shape downward. Thus, the inclination angle of the inner wall of the upper wall of the axial straight liquid chamber is gradually reduced toward the inner periphery.

According to the fourth aspect, the inner wall of the upper wall of the axial straight liquid chamber has a concave concave shape, so that the free surface of the inner surface of the upper wall becomes larger and the durability is improved by the dispersion of stress. It is done. Moreover, if the upper wall inner surface is curved concavely downward, local increase in stress due to sharp bending of the upper wall inner surface due to downward load input is prevented, making durability more effective. Can be obtained.

A fifth aspect of the present invention, the fluid filled type vibration damping device according to the first to fourth any one embodiment, the outer peripheral surface of the main rubber elastic body are fixed said intermediate sleeve , together with the cavity of the rubber elastic body through said window portion provided in the intermediate sleeve is opened to the outer periphery, the outer peripheral surface shape of the opening of the window portion is rubber elastic body in the intermediate sleeve It differs from the opening shape of the space, and a sealing surface constituted by the outer peripheral surface of the main rubber elastic body is provided on the inner periphery of the window portion.

According to the fifth aspect, by making the opening shape of the space formed in the main rubber elastic body different from the opening shape of the window portion formed in the intermediate sleeve, the opening of the void in the main rubber elastic body The peripheral portion is exposed to the outer periphery through the window portion to form a seal surface. Then, the seal surface of the main rubber elastic body is pressed against the orifice member or the outer cylinder member that is superimposed on the outer peripheral surface of the intermediate sleeve, and the non-compressible material that is sealed in the axial liquid chamber Fluid leakage is prevented with a small number of parts.

According to a sixth aspect of the present invention, in the fluid-filled vibration isolator described in any one of the first to fifth aspects, a static support load is provided between the inner shaft member and the outer cylinder member. In the input state, the upper wall inner surface and the lower wall inner surface of the shaft direct liquid chamber are both inclined so as to incline upward toward the inner peripheral side.

According to the sixth aspect, even when a downward load is input from a state where a downward static support load is input, the action of tensile stress on the upper rubber arm and the lower rubber arm is prevented. Thus, the durability of the main rubber elastic body can be improved.

According to a seventh aspect of the present invention, in the fluid-filled vibration isolator described in any one of the first to sixth aspects, the upper portion of the inner shaft member has a taper that gradually increases in diameter upward. And an inner peripheral surface of the lower rubber arm is fixed to the taper portion at a lower portion of the inner shaft member having a smaller diameter than the upper portion. The surface is fixed.

According to the seventh aspect, the upper rubber arm is fixed to the tapered portion, so that the upper rubber arm is efficiently compressed with respect to the downward load input, and the durability is improved by reducing the tensile stress. It is done. Furthermore, since the lower part of the inner shaft member to which the lower rubber arm is fixed has a small diameter, a large free length of the lower rubber arm is ensured and durability is improved. It can be formed with a large volume, and the vibration isolation performance against the input in the direction perpendicular to the axis can be improved.

  According to the present invention, the inner surfaces of the upper and lower walls of the axial liquid chamber are inclined upward toward the inner periphery, and the upper rubber arm and the lower rubber arm of the main rubber elastic body are respectively compressed with respect to the downward load input. As a result, the durability against downward input is improved. For example, even when a downward support load is constantly input, a multi-directional vibration-proof fluid-filled vibration isolator is applied. can do. Further, the upper part of the inner shaft member protrudes from the outer cylinder member, the lower part of the inner shaft member is inserted into the outer cylinder member, the upper rubber arm is fixed to the upper part of the inner shaft member, and the inner shaft Since the lower rubber arm is fixed to the lower part of the member, the inclination angles of the upper rubber arm and the lower rubber arm can be set large, and durability can be secured more advantageously. Furthermore, since the inner peripheral end portions of the upper rubber arm and the lower rubber arm are connected to each other by the inner peripheral connecting portion, and the outer peripheral end portions are connected to each other by the outer peripheral connecting portion, the stress is dispersed. As a result, the durability is further improved.

It is a longitudinal cross-sectional view which shows the engine mount as 1st embodiment of this invention, Comprising: The figure equivalent to the II cross section of FIG. II-II sectional drawing of FIG. The front view of the integral vulcanization molded product which comprises the engine mount shown by FIG. It is a longitudinal cross-sectional view explaining the shaping | molding process of the integrally vulcanized molded product shown by FIG. 3, Comprising: IV-IV sectional drawing of FIG. VV sectional drawing of FIG. The longitudinal cross-sectional view which shows the vehicle mounting state of the engine mount shown by FIG. It is a longitudinal cross-sectional view which shows the engine mount as 2nd embodiment of this invention, Comprising: The figure corresponded in the VII-VII cross section of FIG. VIII-VIII sectional drawing of FIG. FIG. 11 is a longitudinal sectional view for explaining a molding step of an integrally vulcanized molded product constituting the engine mount shown in FIG. 7, and is a IX-IX sectional view of FIG. 10. XX sectional drawing of FIG. The longitudinal cross-sectional view which shows the vehicle mounting state of the engine mount shown by FIG. It is a longitudinal cross-sectional view which shows the engine mount as 3rd embodiment of this invention, Comprising: The figure corresponded in the XII-XII cross section of FIG. XIII-XIII sectional drawing of FIG. FIG. 13 is a right side view of an integrally vulcanized molded product constituting the engine mount shown in FIG. 12. FIG. 15 is a cross-sectional view illustrating a molding process of the integrally vulcanized molded product shown in FIG. 14. The longitudinal cross-sectional view which shows the vehicle mounting state of the engine mount shown by FIG.

  Embodiments of the present invention will be described below with reference to the drawings.

  1 and 2 show an engine mount 10 for an automobile as a first embodiment of a fluid filled type vibration damping device having a structure according to the present invention. The engine mount 10 has a structure in which an inner shaft member 12 and an outer cylinder member 14 are elastically connected by a main rubber elastic body 16. In the following description, the vertical direction refers to the vertical direction in FIG.

  More specifically, the inner shaft member 12 is a high-rigidity member having a substantially circular rod shape with a solid small diameter as a whole, and is formed of a metal material such as iron or aluminum alloy. Further, the inner shaft member 12 is formed with a screw hole 18 extending on the central axis and opening on the upper surface. Further, a tapered portion 20 having an outer peripheral surface that gradually increases in diameter upward is formed on the upper portion of the inner shaft member 12, and a cylindrical outer peripheral surface having a smaller diameter below the upper portion than the upper portion of the tapered portion 20 is formed. It is set as the substantially cylindrical small diameter axial part 22 provided with.

  An intermediate sleeve 24 is disposed on the outer peripheral side of the inner shaft member 12. The intermediate sleeve 24 has a thin cylindrical shape with a large diameter and is a highly rigid member formed of a metal material in the same manner as the inner shaft member 12. In addition, a circumferential groove 26 that extends in the circumferential direction is formed in the intermediate portion in the axial direction of the intermediate sleeve 24 while opening in the outer peripheral surface. In the present embodiment, the circumferential groove 26 is formed by partially reducing the inner and outer diameter dimensions of the intermediate portion in the axial direction of the intermediate sleeve 24.

  Further, four windows 28, 28, 28, 28 are formed in the intermediate sleeve 24. The four window portions 28, 28, 28, 28 are arranged substantially evenly on the circumference, and penetrate through the intermediate portion in the axial direction of the intermediate sleeve 24. By forming such four window portions 28, 28, 28, 28, the intermediate sleeve 24 has upper and lower rings continuous over the entire circumference in the circumferential direction. In the circumferential direction of 28, it has the structure mutually connected by the connection pillar part 30. FIG.

  The inner shaft member 12 is inserted from the upper opening of the intermediate sleeve 24, the upper portion of the inner shaft member 12 protrudes upward from the upper opening of the intermediate sleeve 24, and the lower portion of the inner shaft member 12 is the intermediate sleeve. 24 and is disposed on the inner peripheral side of the intermediate sleeve 24. Further, the inner shaft member 12 and the intermediate sleeve 24 are elastically connected by the main rubber elastic body 16.

  The main rubber elastic body 16 has a substantially truncated cone shape as a whole, and gradually becomes smaller in diameter toward the upper side. The inner shaft member 12 is inserted into the small-diameter end of the main rubber elastic body 16 and vulcanized and bonded, and the inner periphery of the intermediate sleeve 24 is disposed on the outer peripheral surface of the large-diameter end of the main rubber elastic body 16. The surface is vulcanized. In the present embodiment, as shown in FIG. 3, the main rubber elastic body 16 is formed as an integrally vulcanized molded product 32 including the inner shaft member 12 and the outer cylindrical member 14.

  Further, the main rubber elastic body 16 is formed with a large-diameter recess 34 that opens downward. The large-diameter recess 34 has a substantially mortar shape in the opposite direction and gradually increases in diameter downward, and opens on the lower surface of the main rubber elastic body 16.

  The main rubber elastic body 16 is formed with a pair of through holes 36, 36 as voids. The through hole 36 has a tunnel shape penetrating the main rubber elastic body 16 in the direction perpendicular to the axis, and opens to the outer periphery through the window portion 28 of the intermediate sleeve 24. Further, the pair of through holes 36, 36 extend substantially parallel to the direction perpendicular to the axis (the vertical direction in FIG. 2), and in the present embodiment, the pair of through holes 36, 36 are substantially symmetrical on the left and right in FIG. It is a shape. Further, the small-diameter shaft portion 22 of the inner shaft member 12 extends between the pair of through holes 36, 36, and the lower end of the inner shaft member 12 reaches the vicinity of the lower end of the through hole 36 in the present embodiment. It should be noted that the pair of through holes 36, 36 extending in parallel to the direction perpendicular to the axis may be any means that allows the molds to open in the direction perpendicular to the axis of the upper molds 40a, 40b described later, and is strictly parallel. It includes not only the case of extending with a slight inclination in the same direction as the direction perpendicular to the specific axis. As is clear from this, the pair of through holes 36, 36 may extend with a relatively slight inclination angle.

  Further, in the longitudinal cross section of FIG. 1, the through hole 36 has an upper wall inner surface 86 and a lower wall inner surface 88 both of which are inclined so as to incline toward the left and right in FIG. The inclination angle β of the lower wall inner surface 88 is larger than the inclination angle 86 of α. Thereby, the opening shape of the through-hole 36 in the outer peripheral surface of the main rubber elastic body 16 is tapered toward the left and right inward, and is different from the window portion 28 of the intermediate sleeve 24. As shown in FIG. 3, the peripheral portion of the through hole 36 in the main rubber elastic body 16 is exposed to the outer periphery through the window portion 28, and the main rubber elastic body 16 exposed to the outer periphery through the inner periphery of the window portion 28. A sealing surface 37 is constituted by the outer peripheral surface.

  The main rubber elastic body 16 having such a pair of through holes 36, 36 is vulcanized and molded by, for example, a molding die 38 shown in FIGS. That is, the molding die 38 includes upper molds 40 a and 40 b that mold the upper surface and outer peripheral surface of the main rubber elastic body 16, and a lower mold 42 that molds the lower surface of the main rubber elastic body 16.

  The upper molds 40a and 40b are configured to be opened and closed in the length direction of the through-hole 36 (up and down in FIG. 5), and the mold-matching surfaces are located on the outer sides of the through-holes 36 and 36. Each of the connecting column portions 30 and 30 passes through the center in the circumferential direction. The upper molds 40a and 40b and the lower mold 42 are matched to each other, whereby the cavity 44 of the main rubber elastic body 16 is formed in the molding die 38. The inner shaft member 12 and the intermediate sleeve 24 are set and disposed in the cavity 44 when the upper molds 40 a and 40 b and the lower mold 42 are aligned.

  Next, in a state where the upper molds 40a, 40b and the lower mold 42 are clamped and held by a mold clamping device (not shown), a predetermined rubber material is filled into the cavity 44 through a runner (not shown) formed in the lower mold 42. The rubber material is crosslinked while being heated for a time, and the rubber material is vulcanized and bonded to the inner shaft member 12 and the intermediate sleeve 24. Thereafter, the upper molds 40a and 40b are opened up and down in FIG. 5 and the vulcanized main rubber elastic body 16 is removed from the lower mold 42, thereby providing the inner shaft member 12 and the intermediate sleeve 24. An integrally vulcanized molded product 32 of the main rubber elastic body 16 is obtained. Note that, after the main rubber elastic body 16 is molded, the intermediate sleeve 24 may be subjected to a diameter reduction process to pre-compress the main rubber elastic body 16 in the direction perpendicular to the axis.

  In this way, if the upper molds 40a and 40b are opened and closed in the length direction of the through hole 36, both the upper wall inner surface 86 and the lower wall inner surface 88 of the through hole 36 are arranged on the inner peripheral side. It is possible to set a shape that is inclined upward.

  As shown in FIG. 1, the outer cylinder member 14 is attached to the integrally vulcanized molded product 32 of the main rubber elastic body 16 obtained as described above. The outer cylinder member 14 is a high-rigidity member having a thin-walled and large-diameter substantially stepped cylindrical shape, and a flexible film 46 is fixed to the entire lower end portion.

  The flexible film 46 is a thin rubber film, has a substantially disk shape, and can be easily deformed by slacking in the vertical direction. The outer peripheral end portion of the flexible film 46 is vulcanized and bonded to the lower end portion of the outer cylinder member 14 having a small diameter over the entire circumference. On the inner peripheral surface of the outer cylinder member 14, a seal rubber layer 48 formed integrally with the flexible film 46 is formed so as to cover almost the entire surface.

  Then, the flexible membrane 46 is attached to the integral vulcanization molded product 32 by the upper portion of the outer cylinder member 14 having a large diameter being fitted and fixed to the intermediate sleeve 24. In the present embodiment, the outer rubber member 48 and the intermediate sleeve 24 are sandwiched between the outer cylinder member 14 and the intermediate sleeve 24, so that the outer cylinder member 14 and the intermediate sleeve 24 are fluid-tightly combined. The upper end of the outer cylinder member 14 is located at the same position or below in the axial direction with respect to the upper end of the intermediate sleeve 24, and the upper part of the inner shaft member 12 protrudes upward from the outer cylinder member 14. .

  Furthermore, by attaching the flexible membrane 46 to the integrally vulcanized molded product 32, a fluid chamber 50 is formed between the main rubber elastic body 16 and the flexible membrane 46, which is fluid-tightly separated from the outside. And incompressible fluid is sealed inside. The incompressible fluid sealed in the fluid chamber 50 is not particularly limited. For example, water, alkylene glycol, polyalkylene glycol, silicone oil, or a mixed solution thereof is preferably employed. . Moreover, in order to advantageously obtain a vibration isolation effect based on the fluid flow action described later, it is desirable that the fluid be a low viscosity fluid of 0.1 Pa · s or less.

  A partition member 52 is disposed in the fluid chamber 50. The partition member 52 has a substantially disk shape as a whole, and includes a partition member main body 54 and a lid member 56. The partition member body 54 is a thick, substantially disk-shaped member formed of synthetic resin, metal, or the like, and a circular concave receiving recess 58 that opens upward is formed in the central portion in the radial direction. In addition, a circular concave hollow 60 that opens downward is formed. Furthermore, the 1st ditch | groove 62 extended in the circumferential direction is formed in the outer peripheral end part of the partition member main body 54 made thick.

  The lid member 56 has a thin, large-diameter, substantially disk shape, and is superimposed on the upper surface of the partition member main body 54. A movable film 64 is disposed in the accommodation recess 58 covered with the lid member 56. The movable film 64 is a substantially disc-shaped rubber elastic body, and the outer peripheral portion and the radial central portion are thickened and are sandwiched between the partition member main body 54 and the lid member 56, and at the radial middle. The part is thin and allowed to be deformed up and down.

  The partition member 52 having such a structure is disposed in the fluid chamber 50 and supported by the lower portion of the outer cylinder member 14 whose outer peripheral surface has a small diameter, and the partition member 52 is pivoted in the fluid chamber 50. By being arranged so as to spread in a right angle direction, the fluid chamber 50 is divided in two up and down with the partition member 52 interposed therebetween. As a result, a pressure receiving chamber 66 serving as a main liquid chamber is formed above the partition member 52. A part of the wall portion is constituted by the main rubber elastic body 16 and an internal pressure fluctuation is caused when an axial vibration is input. On the other hand, below the partition member 52, a part of the wall portion is formed of the flexible film 46, and an equilibrium chamber 68 is formed as a secondary liquid chamber in which volume change is easily allowed.

  Further, the outer peripheral opening of the first concave groove 62 of the partition member main body 54 is fluid-tightly covered by the outer cylindrical member 14, thereby forming a first orifice passage 70 that allows the pressure receiving chamber 66 and the equilibrium chamber 68 to communicate with each other. Has been. When a vibration load is input in the axial direction and a relative pressure fluctuation is induced between the pressure receiving chamber 66 and the equilibrium chamber 68, the first orifice passage 70 passes between the pressure receiving chamber 66 and the equilibrium chamber 68. Thus, a vibration isolation effect based on the fluid flow action is exerted. In addition, the first orifice passage 70 of the present embodiment adjusts the ratio (A / L) of the passage cross-sectional area (A) and the passage length (L) while considering the wall spring rigidity, for example, in engine shake. It is tuned to a corresponding low frequency of about 10 Hz.

  Further, a lower through-hole 72 is formed through the bottom wall portion of the housing recess 58 in the partition member main body 54, and an upper through-hole 74 is formed through the portion of the lid member 56 that covers the opening of the housing recess 58. ing. The thin portion of the movable film 64 that is allowed to deform is subjected to the hydraulic pressure of the pressure receiving chamber 66 through the upper through hole 74 on the upper surface and the hydraulic pressure of the equilibrium chamber 68 through the lower through hole 72 to the lower surface. Has been hit. Accordingly, the hydraulic pressure in the pressure receiving chamber 66 is absorbed by utilizing the elastic deformation of the movable film 64 against the high frequency small amplitude vibration in the axial direction, thereby exhibiting a vibration isolation effect (low dynamic spring effect). An absorption mechanism is configured. However, such a hydraulic pressure absorbing mechanism is not essential in the present invention, and can be omitted, or another structure such as a movable plate structure that is allowed to allow minute displacement within the housing recess 58 can be adopted. .

  On the other hand, when the outer cylinder member 14 is externally fitted and fixed to the intermediate sleeve 24, the openings of the pair of through holes 36, 36 formed in the main rubber elastic body 16 are both fluid-tight with the outer cylinder member 14. Covered. As a result, a pair of axial direct liquid chambers 76, 76 filled with an incompressible fluid are formed using the pair of through holes 36, 36. For example, by assembling the outer cylindrical member 14 to the integrally vulcanized molded product 32 in a water tank filled with an incompressible fluid, the incompressible fluid is respectively supplied to the pressure receiving chamber 66, the equilibrium chamber 68, and the axial direct liquid chamber 76. Can be easily encapsulated.

  Further, as shown in the longitudinal section of FIG. 1, the main rubber elastic body 16 has a shape that is vertically separated with the axial direct liquid chamber 76 interposed therebetween, and the upper wall portion of the axial direct liquid chamber 76 is The upper rubber arm 78 is configured, and the lower wall portion of the axial straight liquid chamber 76 is configured by the lower rubber arm 80. The upper rubber arm 78 and the lower rubber arm 80 each have a shape having an elastic main shaft that is inclined upward toward the inner periphery, and each of the upper and lower surfaces is inclined such that the upper and lower surfaces are inclined upward toward the inner periphery. .

  Further, the inner peripheral surface of the upper rubber arm 78 is vulcanized and bonded to the upper portion of the tapered portion 20 and the small-diameter shaft portion 22 constituting the upper portion of the inner shaft member 12, and the inner peripheral surface of the lower rubber arm 80 is bonded to the inner portion. Vulcanized and bonded to the lower portion of the small diameter shaft portion 22 constituting the lower portion of the shaft member 12. On the other hand, the outer peripheral surface of the upper rubber arm 78 is vulcanized and bonded to the upper portion of the intermediate sleeve 24, and the outer peripheral surface of the lower rubber arm 80 is vulcanized and bonded to the lower portion of the intermediate sleeve 24. The lower end of the inner shaft member 12 extends between the pair of shaft direct liquid chambers 76 and 76 in the radial direction.

  Further, as shown in FIG. 1, an inner peripheral connecting portion 82 constituted by a part of the main rubber elastic body 16 is provided on the inner peripheral side of the axial straight liquid chamber 76, The peripheral end portion and the inner peripheral end portion of the lower rubber arm 80 are connected to each other by an inner peripheral connecting portion 82. The inner peripheral connecting portion 82 is vulcanized and bonded to the outer peripheral surface of the inner shaft member 12.

  Furthermore, as shown in FIG. 1, an outer peripheral connecting portion 84 formed of a part of the main rubber elastic body 16 is provided on the outer peripheral side of the axial direct liquid chamber 76. The outer peripheral connecting portion 84 is fixed to the inner peripheral surface of the connecting column portion 30 disposed on the outer side in the opposite direction (left and right in FIG. 2) of the pair of axial liquid chambers 76, 76, and the outer periphery of the upper rubber arm 78. The end and the outer peripheral end of the lower rubber arm 80 are connected vertically. In the present embodiment, the outer peripheral connecting portion 84 is vertically longer than the inner peripheral connecting portion 82 and is thin in the radial direction.

  Further, in the longitudinal section shown in FIG. 1, both the upper wall inner surface 86 and the lower wall inner surface 88 of the axial direct liquid chamber 76 are inclined so as to incline upward toward the left and right. Furthermore, in the longitudinal section shown in FIG. 1, the average value of the inclination angle of the lower wall inner surface 88 of the axial straight liquid chamber 76: β is larger than the average value of the inclination angle of the upper wall inner surface 86 of the axial direct liquid chamber 76: α. The longitudinal cross-sectional shape of the axial direct liquid chamber 76 is inclined upward and tapered toward the inner periphery. In the axial straight liquid chamber 76 of the present embodiment, the upper wall inner surface 86 and the lower wall inner surface 88 are connected almost directly at the inner peripheral end portion, and the outer peripheral end portion that is greatly separated in the vertical direction is expanded in the axial direction. They are connected to each other by wall inner surfaces 90.

Further, the upper wall inner surface 86 of the axial direct liquid chamber 76 has a curved shape that is concave downward in the longitudinal section, and the inclination angle of the upper wall inner surface 86 of the axial direct liquid chamber 76 gradually decreases as it goes to the inner periphery. Te, the inclination angle of the inner peripheral edge: alpha ₁ is the angle of inclination of the outer peripheral end: is smaller than alpha _2.

Preferably, the average value of the inclination angle of the upper wall inner surface 86 of the axial direct liquid chamber 76: α is set to 20 ° ≦ α ≦ 40 °, and the inclination angle of the lower wall inner surface 88 of the axial direct liquid chamber 76 Average value: β is 30 ° ≦ β ≦ 60 °. Also, preferably, the inclination angle of the inner circumferential edge of the upper wall inner surface 86: with alpha ₁ is a _{10 ° ≦ α 1 ≦ 20 °} , the inclination angle of the outer peripheral end of the upper wall inner surface 86: alpha ₂ is 30 ° ≦ α ₂ ≦ 60 °.

  The pair of axial straight liquid chambers 76 and 76 are communicated with each other by a second orifice passage 92. That is, a set of orifice members 94 a and 94 b are disposed in the circumferential groove 26 of the intermediate sleeve 24. Each of the orifice members 94 has a substantially semi-cylindrical shape, and a second concave groove 96 is formed in the outer circumferential surface and extending in the circumferential direction. Then, the outer cylindrical member 14 is fitted on the intermediate sleeve 24, so that the outer peripheral opening of the second concave groove 96 is covered fluid-tightly by the outer cylindrical member 14, and the pair of axial direct liquid chambers 76, 76 are formed. A second orifice passage 92 communicating with each other is formed. The tuning frequency of the second orifice passage 92 is tuned to, for example, a low frequency of about 10 Hz corresponding to engine shake or a medium frequency of about several tens Hz corresponding to idling vibration. In the present embodiment, the orifice member 94 is superimposed on the seal surface 37 of the main rubber elastic body 16 at the opening portion of the through hole 36, and a sealing property is secured between the orifice member 94 and the intermediate sleeve 24. .

  When a vibration load in the direction perpendicular to the axis is input between the inner shaft member and the outer cylinder member in the opposing direction of the pair of axial straight liquid chambers 76, 76, the resonance action of the fluid flowing through the second orifice passage 92 is achieved. The anti-vibration effect based on the above is effectively exhibited.

  In the engine mount 10 having such a structure, as shown in FIG. 6, the inner shaft member 12 is attached to a power unit (not shown) via an inner bracket 97 and the outer cylinder member 14 is attached to a vehicle via an outer bracket 98. By being attached to the body 99, it is attached to the vehicle. In such a vehicle mounted state, a static shared support load of the power unit is input between the inner shaft member 12 and the outer cylinder member 14, and the inner shaft member 12 is connected to the outer cylinder as shown in FIG. The main rubber elastic body 16 is elastically deformed by being relatively displaced downward with respect to the member 14. In the vehicle mounting state, the lower end of the inner shaft member 12 is positioned below the lower ends of the pair of axial direct liquid chambers 76 and 76.

  In the engine mount 10, since the upper rubber arm 78 and the lower rubber arm 80 of the main rubber elastic body 16 are both inclined upward toward the inner peripheral side, the shared support of the power unit is provided. When the load is input downward, the upper rubber arm 78 and the lower rubber arm 80 are compressed. In particular, since the lower surfaces of the upper and lower rubber arms 78 and 80 are all inclined surfaces inclined upward toward the inner peripheral side, the tensile stress acting on the surfaces of the upper and lower rubber arms 78 and 80 is reduced. Durability is improved.

  Further, in the present embodiment, even when the vehicle unit is loaded with the shared support load of the power unit, as shown in FIG. 6, both the upper rubber arm 78 and the lower rubber arm 80 are inclined upward toward the inner peripheral side. It is supposed to be shaped. Therefore, even if a dynamic vibration load such as an engine shake is input in the axial direction in a state where the shared support load of the power unit is input, the tensile stress of the upper rubber arm 78 and the lower rubber arm 80 is reduced. Durability is ensured.

  Moreover, the upper wall inner surface 86 of the axial direct liquid chamber 76 that is the lower surface of the upper rubber arm 78 and the inner surface 88 of the lower wall of the axial direct liquid chamber 76 that is the upper surface of the lower rubber arm 80 are both mounted in the vehicle. It is set as the inclination shape which inclines upward toward the left-right inward in FIG. Therefore, even if a downward load is further input in the vehicle mounting state, the tensile stress on the wall inner surface of the axial liquid chamber 76 is reduced, and cracks and the like are prevented.

  Further, the upper and lower rubber arms 78 and 80 have inner peripheral ends integrally connected by an inner peripheral connecting portion 82 and outer peripheral ends integrally connected by an outer peripheral connecting portion 84. The stress can be distributed between the upper rubber arm 78 and the lower rubber arm 80, and the durability can be further improved. Moreover, since not only the upper and lower wall portions of the axial direct liquid chamber 76 but also the inner and outer peripheral wall portions are constituted by a part of the main rubber elastic body 16, the inner wall surface of the axial direct liquid chamber 76 is formed. The surface area of the main rubber elastic body 16 is increased, and the strain on the inner wall surface of the axial liquid chamber 76 is further dispersed and reduced.

  The inner peripheral end of the upper rubber arm 78 is fixed to the upper portion of the inner shaft member 12, and the inner peripheral end of the lower rubber arm 80 is fixed to the lower portion of the inner shaft member 12. Thereby, since the axial dimension of the main rubber elastic body 16 at the inner peripheral end is largely secured, the inclination angles of the upper rubber arm 78 and the lower rubber arm 80 that are inclined upward toward the inner peripheral side. Can be set larger. Therefore, the tensile stress acting on the upper rubber arm 78 and the lower rubber arm 80 at the time of axially downward input can be more effectively reduced, and durability against downward input can be obtained more advantageously.

  Moreover, by efficiently securing the axial dimension of the main rubber elastic body 16 at the inner peripheral end, the axial dimension of the axial liquid chamber 76 and the upper and lower rubber arms 78 and 80 can be reduced while suppressing the axial dimension of the entire mount. The rubber volume can be secured, and the vibration isolation performance against vibration input in the direction perpendicular to the axis can be improved and the durability can be further improved.

  In particular, in the present embodiment, the upper portion of the inner shaft member 12 protrudes upward from the outer cylinder member 14, and the lower portion of the inner shaft member 12 is inserted into the outer cylinder member 14, and a pair of shaft direct liquid chambers 76, 76. The axial dimension of the main rubber elastic body 16 at the inner peripheral end can be further ensured. In addition, since the lower part of the inner shaft member 12 is inserted between the pair of shaft direct liquid chambers 76, 76, the fluid pressure fluctuations of the pair of shaft direct liquid chambers 76, 76 with respect to the vibration input in the direction perpendicular to the axis is efficient. Therefore, it is possible to more effectively obtain the vibration isolation effect due to the fluid flow action.

  7 and 8 show an engine mount 100 as a second embodiment of the present invention. The engine mount 100 has a structure in which an inner shaft member 12 and an intermediate sleeve 102 are elastically connected by a main rubber elastic body 104 as shown in FIGS. In addition, in the following description, about the member and site | part substantially the same as 1st embodiment, description is abbreviate | omitted by attaching | subjecting the same code | symbol in a figure.

  More specifically, the intermediate sleeve 102 has a structure in which the connection column portion 30 is opposed to the intermediate sleeve 102 of the first embodiment in one radial direction, and the upper and lower rings have two connections. It is a structure connected by the column parts 30 and 30. As a result, the intermediate sleeve 102 of the present embodiment is formed with two window portions 106 and 106 that are opposed to each other in one radial direction, and each of the window portions 106 and 106 has a length of a little less than half in the circumferential direction. It extends. Further, the intermediate sleeve 102 has a stepped cylindrical shape having a step at an axially intermediate portion, and the lower portion has a smaller diameter than the upper portion.

  Then, the inner shaft member 12 is inserted into the intermediate sleeve 102, and the inner shaft member 12 and the intermediate sleeve 102 are elastically connected by the main rubber elastic body 104, whereby the main rubber elastic body 104 is integrally vulcanized molded product 108. Is formed. Similar to the first embodiment, the main rubber elastic body 104 has a thick and large-diameter substantially truncated cone shape, and includes an upper rubber arm 78 and a lower rubber arm 80, and upper and lower rubbers thereof. A through-hole 110 serving as a void is provided between the arms 78 and 80. The through-hole 110 extends in parallel to a direction (upper and lower in FIG. 8) that is substantially orthogonal to the opposing radial direction of the two connecting column portions 30 and 30, and in the vertical cross section shown in FIG. The upper wall inner surface 112 which inclines upward toward the left and right inward, and the lower wall inner surface 114 which inclines upward toward the inner periphery. In the present embodiment, the upper wall inner surface 112 and the lower wall inner surface 114 are vertically separated at both the inner peripheral end and the outer peripheral end, and the wall inner surface of the through-hole 110 is located inside the upper wall inner surface 112 and the lower wall inner surface 114. An inner peripheral wall inner surface 116 connected to each other at the peripheral end and an outer peripheral wall inner surface 118 connected to each other at the outer peripheral end are provided. Thereby, as for the through-hole 110, the whole wall inner surface is comprised with the rubber elastic body.

  In addition, as shown in FIG. 7, the upper wall inner surface 112 and the lower wall inner surface 114 of the through-hole 110 are spread at a substantially constant inclination angle, and the lower wall inner surface 114 is larger than the inclination angle of the upper wall inner surface 112. The inclination angle is increased.

  In addition, the main rubber elastic body 104 provided with the through holes 110 and 110 according to the present embodiment is vulcanized and molded by a molding die 120 shown in FIGS. That is, the molding die 120 molds the upper mold 122 that molds the upper surface of the main rubber elastic body 104, the middle molds 124 a and 124 b that mold the outer peripheral surface of the main rubber elastic body 104, and the lower surface of the main rubber elastic body 104. A lower mold 126 is provided.

  The middle molds 124a and 124b are configured to be opened and closed in the length direction of the through-hole 110 in the same manner as the upper molds 40a and 40b of the first embodiment. , 130 pass through the center in the circumferential direction of the connecting column portions 30, 30 located on the outer peripheral side. Then, the upper mold 122, the middle molds 124a and 124b, and the lower mold 126 are matched with the inner shaft member 12 and the intermediate sleeve 102 set, so that the main rubber elastic body 104 is placed in the molding mold 120. A cavity 128 is formed.

  Next, after filling the cavity 128 with a predetermined rubber material and vulcanizing the main rubber elastic body 104, the upper mold 122 is opened upward in FIG. 9 and the middle molds 124a and 124b are opened in FIG. The main rubber elastic body 104 provided with the inner shaft member 12 and the intermediate sleeve 102 is integrally vulcanized and molded by opening the mold up and down and removing the vulcanized main rubber elastic body 104 from the lower mold 126. Product 108 is obtained.

  As shown in FIGS. 7 and 8, the outer cylinder member 14 is externally fitted to the integrally vulcanized molded article 108 of the main rubber elastic body 104 obtained as described above, and the openings of the pair of through holes 110 and 110 are formed. A pair of axial straight liquid chambers 130 and 130 in which an incompressible fluid is sealed are formed by being fluid-tightly covered by the outer cylinder member 14.

  In the present embodiment, an orifice member 132 is extrapolated to the intermediate sleeve 102. The orifice member 132 has a length of more than half a circumference in the circumferential direction, has a predetermined height in the axial direction, and includes a second concave groove 134 that opens in the outer circumferential surface and extends in the circumferential direction. ing. The orifice member 132 is externally attached to the intermediate sleeve 102 from below and is attached to the lower portion of the intermediate sleeve 102 having a small diameter. The orifice member 132 is supported between the intermediate sleeve 102 and the outer cylinder member 14 in the radial direction. Has been. Then, the outer peripheral opening of the second concave groove 134 is fluid-tightly covered with the outer cylindrical member 14, thereby forming a second orifice passage 136 that allows the pair of axial liquid chambers 130 and 130 to communicate with each other. Yes.

  The engine mount 100 of the present embodiment is also shown in FIG. 11 even in a vehicle mounted state in which a static shared support load of a power unit (not shown) is input downward between the inner shaft member 12 and the outer cylinder member 14. Thus, the upper wall inner surface 112 and the lower wall inner surface 114 of the axial direct liquid chamber 130 are both inclined upward toward the inner periphery. Note that the upper rubber arm 78 and the lower rubber arm 80 of the main rubber elastic body 104 are both shaped so that the elastic main shaft is inclined upward toward the inner peripheral side, and in the vehicle mounted state, the shared support load of the power unit Thus, the upper rubber arm 78 and the lower rubber arm 80 are respectively compressed.

  Also by the engine mount 100 having the structure according to the present embodiment, the same effect as that of the engine mount 10 according to the first embodiment can be effectively obtained. Furthermore, the upper wall inner surface 112 and the lower wall inner surface 114 of the axial straight liquid chamber 130 are vertically separated not only at the outer peripheral end but also at the inner peripheral end, and are connected to each other by the inner peripheral wall inner surface 116 extending vertically. Therefore, a large volume of the axial direct liquid chamber 130 is ensured, and an anti-vibration effect against an input in a direction perpendicular to the axis is advantageously exhibited. Furthermore, since the second orifice passage 136 is constituted by one orifice member 132, the number of parts can be reduced.

  12 and 13 show an engine mount 140 as a third embodiment of the present invention. The engine mount 140 includes an integral vulcanization molded product 145 (see FIG. 14) in which the inner shaft member 12 and the intermediate sleeve 142 are elastically connected by a main rubber elastic body 144.

  The intermediate sleeve 142 has a thin, large-diameter, generally cylindrical shape, and two window portions 146, 146 are formed in an intermediate portion in the axial direction. The window portions 146 and 146 have the same shape as each other, and are formed in a region within a half circumference on the circumference of the intermediate sleeve 142. Thereby, between the circumferential direction of the window parts 146 and 146, the main connection part 148 extended by the length of a half circumference or more in the circumferential direction, and the connection pillar part 30 whose circumferential direction dimension is smaller than the main connection part 148 are provided. ing. Further, as shown in FIG. 14, a circumferential groove 150 that opens to the outer peripheral surface and extends in the circumferential direction is formed in the axially intermediate portion of the main connecting portion 148.

  The main rubber elastic body 144 includes a pair of recesses 152 and 152 as voids. The recess 152 extends parallel to the direction perpendicular to the axis, and has a concave shape that opens to a part of the outer peripheral surface of the main rubber elastic body 144. The pair of recesses 152 and 152 are opened in substantially the same direction, and are opened to the outer periphery through the pair of window portions 146 and 146 of the intermediate sleeve 142. Note that both end portions in the length direction of the circumferential groove 150 are communicated with one of the respective recesses 152.

  Further, in the longitudinal section shown in FIG. 12, the recess 152 has an upper wall inner surface 154 inclined upward toward the left and right in FIG. 12, and a lower wall inner surface 156 inclined upward toward the inner periphery. ing. Furthermore, the inner peripheral end and the outer peripheral end of the upper wall inner surface 154 and the lower wall inner surface 156 are vertically separated, and the recess 152 has a shape including an inner peripheral wall inner surface 158 and an outer peripheral wall inner surface 160. In the present embodiment, the upper wall inner surface 154 has a downwardly concave curved shape and the lower wall inner surface 156 has an upwardly concave curved shape in the longitudinal section of FIG.

  The main rubber elastic body 144 of the present embodiment having the recesses 152 and 152 is vulcanized and molded by a molding die 162 shown in FIG. 15, for example. That is, the molding die 162 includes upper molds 164 a and 164 b that mold the upper surface and outer peripheral surface of the main rubber elastic body 144, and a lower mold 42 that molds the lower surface of the main rubber elastic body 144.

  The upper molds 164a and 164b are configured to be opened and closed in the length direction of the recess 152 in the same manner as the upper mold 164 of the first embodiment. In the present embodiment, the inner shape of the recess 152 is set by the upper mold 164a. Then, the upper molds 164a and 164b and the lower mold 42 are mold-matched in a state where the inner shaft member 12 and the intermediate sleeve 142 are set, so that the cavity 168 of the main rubber elastic body 144 is formed in the molding die 162. It has come to be.

  Next, the cavity 168 is filled with a predetermined rubber material and vulcanized and molded, and then the upper molds 164a and 164b are opened up and down in FIG. 15 and the vulcanized molded rubber elastic body 144 is molded into the lower mold. By removing the mold from 42, an integrally vulcanized molded product 145 of the main rubber elastic body 144 including the inner shaft member 12 and the intermediate sleeve 142 is obtained.

  By attaching the outer cylinder member 14 to the integrally vulcanized molded product 145 of the main rubber elastic body 144 obtained in this manner, the openings of the pair of recesses 152 and 152 are fluidized by the outer cylinder member 14. A pair of axial straight liquid chambers 170, 170 are formed which are tightly closed and sealed with an incompressible fluid.

  Further, the outer cylindrical member 14 is fitted on the intermediate sleeve 142, and the outer peripheral opening of the circumferential groove 150 is fluid-tightly covered with the outer cylindrical member 14, whereby the pair of axial direct liquid chambers 170, 170 are mutually connected. A second orifice passage 172 that communicates is formed. In the present embodiment, the inner surface of the circumferential groove 150 is covered with a covering rubber layer 174 integrally formed with the main rubber elastic body 144, and the shape of the covering rubber layer 174 is appropriately set, so that the second orifice The cross-sectional shape of the passage 172 is set according to the tuning frequency and the like.

  In the engine mount 140 having such a structure, as shown in FIG. 16, a static shared support load of the power unit is input between the inner shaft member 12 and the outer cylinder member 14 in a mounted state on the vehicle. It is like that. Even in such a vehicle mounting state, the upper wall inner surface 154 and the lower wall inner surface 156 of the pair of axial direct liquid chambers 170, 170 are both inclined so as to gradually incline toward the inner periphery.

  Also in the engine mount 140 having the structure according to the present embodiment as described above, the same effects as those of the embodiment can be obtained. Moreover, in the engine mount 140, the second orifice passage 172 is formed using the circumferential groove 150 of the intermediate sleeve 142 without requiring a special orifice member, so that the simple structure with a small number of parts can be obtained. can do.

  As mentioned above, although embodiment of this invention was explained in full detail, this invention is not limited by the specific description. For example, in the above-described embodiment, the lower wall inner surface is inclined upward toward the inner periphery at a larger inclination angle than the upper wall inner surface of the axial direct liquid chamber in the longitudinal section, but the inclination angles of the upper wall inner surface and the lower wall inner surface Can be made substantially the same as each other, and the inner surface of the upper wall can be inclined upward toward the inner periphery at a larger inclination angle than the inner surface of the lower wall.

  Further, the window portion of the intermediate sleeve may be opened in substantially the same shape as the opening shape of the void (through holes 36, 110 and recess 152) of the main rubber elastic body.

  The present invention is not limited to a fluid-filled vibration isolator used as an engine mount, but can be applied to a body mount, a subframe mount, a differential mount, and the like. Furthermore, the scope of application of the present invention is not limited to a fluid-filled vibration isolator for automobiles, but also includes a fluid-filled vibration isolator used for motorcycles, railway vehicles, industrial vehicles, and the like. It can be applied.

10, 100, 140: Engine mount (fluid-filled vibration isolator), 12: Inner shaft member, 14: Outer cylinder member, 16, 104, 144: Main rubber elastic body, 20: Tapered portion, 22: Small diameter shaft portion 24, 102, 142: intermediate sleeve, 28, 106, 146: window, 36, 110: through hole (vacant space), 37: sealing surface, 52: partition member, 66: pressure receiving chamber (main liquid chamber), 68: equilibrium chamber (sub-liquid chamber), 70: first orifice passage, 76, 130, 170: axial straight liquid chamber, 78: upper rubber arm, 80: lower rubber arm, 82: inner peripheral connecting portion, 84 : Outer peripheral connection part, 86, 112, 154: upper wall inner surface, 88, 114, 156: lower wall inner surface, 92, 136, 172: second orifice passage

Claims (7)

An inner shaft member is inserted into the outer cylinder member and elastically connected by the main rubber elastic body, and a main liquid chamber and a sub liquid chamber are formed on both upper and lower sides with a partition member supported by the outer cylinder member interposed therebetween. The main liquid chamber and the sub liquid chamber communicate with each other by the first orifice passage, while the main rubber elastic body is formed with a pair of cavities that open to the outer peripheral surface. A fluid-filled vibration isolating system in which the opening is covered with the outer cylindrical member to form a pair of axial direct liquid chambers, and a second orifice passage is formed to communicate the pair of axial direct liquid chambers with each other In the device
Both the upper wall inner surface and the lower wall inner surface of the axial straight liquid chamber are inclined so as to incline toward the inner peripheral side, and an axial downward load is applied between the inner shaft member and the outer cylinder member. An upper rubber arm of the main rubber elastic body constituting the upper wall portion of the axial direct liquid chamber by being input, and a lower rubber arm of the main rubber elastic body constituting the lower wall portion of the axial direct liquid chamber; Are compressed, and the pair of voids in the main rubber elastic body extend in parallel to the direction perpendicular to the axis, and on the inner peripheral side of the void in the main rubber elastic body An inner peripheral connecting portion for connecting the upper rubber arm and the lower rubber arm to each other at the inner peripheral end is provided, and the upper rubber arm and the upper rubber arm are disposed on the outer peripheral side of the void in the main rubber elastic body. While an outer peripheral connecting portion that connects the lower rubber arms to each other at the outer peripheral end is provided,
The pair of voids are tunnel-like through holes that penetrate the main rubber elastic body, respectively, and the outer wall portion of the tunnel-like through hole is constituted by the outer peripheral coupling portion,
An integral intermediate sleeve is fixed to the outer peripheral surface of the main rubber elastic body including the outer peripheral connecting portion, and the pair of voids of the main rubber elastic body are respectively formed through windows provided in the intermediate sleeve. An orifice member that opens to the outer periphery and is arranged so as to straddle the window portion in the circumferential direction on the outer peripheral surface of the intermediate sleeve is surrounded by the intermediate sleeve fixed to the outer peripheral surface of the outer peripheral connection portion. While the middle part of the direction is supported
The upper part of the inner shaft member protrudes from the axial opening of the outer cylinder member, the inner peripheral surface of the upper rubber arm is fixed to the upper part of the inner shaft member, and the lower part of the inner shaft member is Fluid-filled, characterized in that it is inserted into the outer cylinder member and extends to between the pair of shaft direct liquid chambers, and the inner peripheral surface of the lower rubber arm is fixed to the lower portion of the inner shaft member Type vibration isolator. An inner shaft member is inserted into the outer cylinder member and elastically connected by the main rubber elastic body, and a main liquid chamber and a sub liquid chamber are formed on both upper and lower sides with a partition member supported by the outer cylinder member interposed therebetween. The main liquid chamber and the sub liquid chamber communicate with each other by the first orifice passage, while the main rubber elastic body is formed with a pair of cavities that open to the outer peripheral surface. A fluid-filled vibration isolating system in which the opening is covered with the outer cylindrical member to form a pair of axial direct liquid chambers, and a second orifice passage is formed to communicate the pair of axial direct liquid chambers with each other In the device
Both the upper wall inner surface and the lower wall inner surface of the axial straight liquid chamber are inclined so as to incline toward the inner peripheral side, and an axial downward load is applied between the inner shaft member and the outer cylinder member. An upper rubber arm of the main rubber elastic body constituting the upper wall portion of the axial direct liquid chamber by being input, and a lower rubber arm of the main rubber elastic body constituting the lower wall portion of the axial direct liquid chamber; Are compressed, and the pair of voids in the main rubber elastic body extend in parallel to the direction perpendicular to the axis, and on the inner peripheral side of the void in the main rubber elastic body An inner peripheral connecting portion for connecting the upper rubber arm and the lower rubber arm to each other at the inner peripheral end is provided, and the upper rubber arm and the upper rubber arm are disposed on the outer peripheral side of the void in the main rubber elastic body. While an outer peripheral connecting portion that connects the lower rubber arms to each other at the outer peripheral end is provided,
The outer peripheral surface of the main rubber elastic body is secured intermediate sleeve, a pair of window portions provided in the intermediate sleeve is disposed within half of the circumference of the intermediate sleeve, the pair of air The recesses are opened in the same direction perpendicular to each other, and the pair of cavities are opened in the window, respectively, while the intermediate sleeve is circumferentially extended in the circumferential direction while opening in the outer peripheral surface. A groove is formed, the second orifice passage is formed by covering an outer peripheral opening of the circumferential groove with the outer cylindrical member , and
The upper part of the inner shaft member protrudes from the axial opening of the outer cylinder member, the inner peripheral surface of the upper rubber arm is fixed to the upper part of the inner shaft member, and the lower part of the inner shaft member is Fluid-filled , characterized in that it is inserted into the outer cylinder member and extends to between the pair of shaft direct liquid chambers, and the inner peripheral surface of the lower rubber arm is fixed to the lower portion of the inner shaft member Type vibration isolator. The fluid-filled vibration isolator according to claim 1 or 2 , wherein an inclination angle of the inner surface of the lower wall is larger than an inclination angle of the inner surface of the upper wall of the axial liquid chamber. Top wall inner surface of the shaft straight liquid chamber is a concave curved downward, any claim 1-3 which is gradually reduced in accordance with the inclination angle of the upper wall inner surface of the shaft straight liquid chamber toward the inner peripheral or fluid-filled vibration damping device according to item 1. Wherein the outer peripheral surface of the main rubber elastic body are fixed said intermediate sleeve, with said cavity of the rubber elastic body is open to the outer periphery through the window portion provided in the intermediate sleeve, between intermediate The opening shape of the window portion in the sleeve is different from the opening shape of the cavity in the outer peripheral surface of the main rubber elastic body, and the inner periphery of the window portion is a seal formed by the outer peripheral surface of the main rubber elastic body fluid-filled vibration damping device according to any one of claims 1-4 in which the surface is provided. An inclined shape in which the upper wall inner surface and the lower wall inner surface of the shaft direct liquid chamber are inclined upward toward the inner peripheral side in a state where a static support load is input between the inner shaft member and the outer cylindrical member. The fluid-filled vibration isolator according to any one of claims 1 to 5 . The inner shaft member is provided with a tapered portion that gradually increases in diameter toward the upper side, and the inner peripheral surface of the upper rubber arm is fixed to the tapered portion, and has a smaller diameter than the upper portion. The fluid-filled vibration isolator according to any one of claims 1 to 6 , wherein an inner peripheral surface of the lower rubber arm is fixed to a lower portion of the inner shaft member.

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