JP2015083849A - Vibration isolator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration isolator which can improve space saving performance while suppressing the transmission of noise generated in a liquid chamber to a vehicle body.SOLUTION: An outside fixture and an inside fixture are connected by a vibration isolation base body. Since the outside fixture is connected to a vibration source side, and the inside fixture is connected to a support body side, the transmission of noise generated in a liquid chamber can be suppressed by a vibration isolation effect of the vibration isolation base body. The outside fixture is arranged at the outside of a radial direction rather than the inside fixture, and an internal wall of the vibration isolation base body facing the liquid chamber and an external wall at an opposite side are downwardly inclined as progressing toward the inside fixture from the outside fixture. Since an altitude difference between the outside fixture and the inside fixture can be reduced, a vertical length of a vibration-side bracket which connects an engine side and the outside fixture can be shortened, and space saving performance can be improved.

Description

  The present invention relates to an anti-vibration device, and more particularly to an anti-vibration device that can improve space saving while suppressing abnormal noise generated in a liquid chamber from being transmitted to a vehicle body.

  A vibration isolator that suppresses transmission of vibration to the vehicle body is provided between the vehicle body and the engine that is the vibration source. This type of anti-vibration device includes an anti-vibration base composed of a rubber-like elastic body that connects the inner fixture and the cylindrical outer fixture, and the anti-vibration base forms part of the chamber wall and encloses the liquid There is known a liquid-filled vibration isolator including a liquid chamber that is formed, a partition that partitions the liquid chamber into a plurality, and an orifice that communicates between the liquid chambers partitioned by the partition. Patent Document 1 discloses a so-called inverted type vibration isolator in which an inner fixture of a liquid-filled type vibration isolator is attached to the vehicle body side, and an outer fixture is attached to the engine side via a bracket. In the vibration isolator disclosed in Patent Document 1, it is possible to suppress abnormal noise generated in the liquid chamber due to cavitation or the like from being transmitted to the vehicle body due to the vibration insulating effect of the vibration isolating base.

JP 2009-14080 A

  However, in the above-described conventional vibration isolator, since the outer fitting attached to the engine side is positioned above the inner attachment portion attached to the vehicle body, the vibration isolator is attached to the vehicle body. When the attachment position of the anti-vibration base to the engine side with respect to the position is substantially horizontal or below, the difference in height between the attachment position on the engine side and the outer fixture becomes large. For this reason, the vertical length of the bracket connecting the engine side and the outer fixture increases, and as a result, there is a problem that the space saving performance of the vibration isolator deteriorates.

  The present invention has been made to solve the above-described problem, and an object thereof is to provide a vibration isolator capable of improving space saving while suppressing abnormal noise generated in a liquid chamber from being transmitted to a vehicle body. It is said.

Means for Solving the Problems and Effects of the Invention

  In order to achieve this object, according to the vibration isolator of claim 1, the support side bracket is attached to the support side, while the vibration side bracket is attached to the vibration source side. In the vibration isolator main body, the inner attachment tool is attached to the support side bracket, and the cylindrical outer attachment tool is attached to the vibration side bracket. The outer fixture and the inner fixture are connected by a vibration isolating base composed of a rubber-like elastic body, and the vibration isolating base constitutes a part of the chamber wall of the liquid chamber in which the liquid is sealed. The liquid chamber is partitioned into a plurality by the partition, and the liquid chambers partitioned by the partition are communicated by the orifice. As a result, abnormal noise generated in the liquid chamber due to cavitation or the like can be suppressed from being transmitted to the vehicle body via the inner fixture and the support-side bracket due to the vibration insulation effect of the vibration-proof base.

  The outer fixture is disposed on the radially outer side of the inner fixture, and the anti-vibration base is an inner wall in which the inner wall facing the liquid chamber and the outer wall opposite to the inner wall are inclined downwardly from the outer fixture toward the inner fixture. An inclined surface and an outer wall inclined surface are provided. The height difference between the outer fixture and the inner fixture can be reduced by inclining the anti-vibration base as it goes radially inward. As a result, the vertical length of the vibration-side bracket that connects the engine side and the outer mounting tool can be reduced, so that there is an effect of improving space saving.

  According to the vibration isolator of claim 2, the vibration isolator body includes a rubber film-like elastic partition film formed of a rubber-like elastic body between the liquid chambers, and the displacement amount of the elastic partition film is It is regulated from both sides of the film surface by a pair of displacement regulating means. In a small amplitude vibration, a low dynamic spring characteristic is exhibited in combination with the reciprocating displacement of the elastic partition film. On the other hand, at the amplitude of large vibration, the elastic partition film collides with the displacement restricting means, the liquid flow around the elastic partition film is blocked, and the liquid flow effect by the orifice is exhibited. Furthermore, the impact sound (abnormal noise) generated when the elastic partition film collides with the displacement restricting means is suppressed from being transmitted to the vehicle body via the inner fixture and the support side bracket due to the vibration insulation effect of the vibration isolating base. it can. Therefore, in addition to the effect of the first aspect, it is possible to attenuate the vibration with a small amplitude and to suppress the transmission of the hitting sound (abnormal sound) into the vehicle interior.

  According to the vibration isolator of the third aspect, the stopper portion is inclined downward from the support side bracket in a direction close to the vibration side bracket, or is inclined upward from the vibration side bracket in a direction close to the support side bracket. The A stopper rubber portion made of a rubber-like elastic body is disposed on at least one of the opposing surfaces where the stopper portion and the vibration side bracket or the support side bracket face each other in the vertical direction. Therefore, when attaching a vibration isolator to the support body side and the vibration source side, the work of interposing a stopper rubber member between the support side bracket and the outer mounting tool can be omitted. Therefore, in addition to the effect of the first or second aspect, there is an effect that the mounting workability when the vibration isolator is mounted on the support side and the vibration source side can be improved.

It is an axial sectional view of the vibration isolator according to the first embodiment of the present invention. It is axial direction sectional drawing of the vibration isolator in 2nd Embodiment.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the accompanying drawings. FIG. 1 is an axial cross-sectional view of a vibration isolator 1 according to a first embodiment of the present invention. The vibration isolator 1 is a device that elastically supports an automobile engine with respect to a vehicle body, and includes a support side bracket 10 that is attached to a vehicle body that is a support body, and a vibration side bracket 20 that is attached to an engine side that is a vibration source. And a vibration isolator body 30 attached to the vibration side bracket 20 and the support side bracket 10. The vibration isolator body 30 is a liquid-filled vibration isolator in which a liquid is sealed. 1 is a direction in which a static load (support load) is input to the vibration isolator body 30 when the vibration isolator 1 is installed, and the upper side in FIG. 1 is a rebound. Side, that is, the opposite side of the direction of static load input. FIG. 1 shows a state where a static load is input to the vibration isolator 1 (a state where the engine side is suspended) (the same applies in FIG. 2).

  As shown in FIG. 1, the support side bracket 10 is a member for connecting the vehicle body side as a support and the vibration isolator main body 30 and is a metal cast product in the present embodiment. The support-side bracket 10 has a bottomed cylindrical mounting portion 11 that extends in the axial direction along the axis O of the vibration isolator body 30, and a direction perpendicular to the axis O from the top of the mounting portion 11. A plate-like main body portion 12 that extends and a plate-like stopper portion 13 that extends from between the upper portion and the bottom portion of the attachment portion 11 in a direction intersecting the axis O are provided.

  The attachment part 11 is a part to which the vibration isolator main body 30 is attached, and an attachment hole part 11a penetrating in the thickness direction is formed in the bottom part. The main body portion 12 is a portion where a predetermined portion is fixed to the support body (vehicle body side). The stopper portion 13 is a portion for forming a stopper that restricts the displacement when the dynamic load on the rebound side is input between the vibration side bracket 20 and the shaft from the top and bottom of the mounting portion 11. A lateral arm portion 13a extending in a direction substantially perpendicular to the center O, a descending arm portion 13b inclined downward from the end of the lateral arm portion 13a in a direction approaching the vibration side bracket 20, and a descending arm portion And a first stopper 13c extending from the end of 13b in a direction substantially orthogonal to the axis O.

  The lateral arm portion 13 a is a portion for avoiding interference between the stopper portion 13 and the vibration isolator main body 30, and the attachment portion 11 is positioned so that the end portion is positioned on the radially outer side of the vibration isolator main body 30 when viewed in the axial direction. Projecting radially outward. The descending arm portion 13b is a portion for bringing the stopper portion 13 close to a predetermined portion of the vibration side bracket 20, and is descended and inclined so as to gradually move away from the axis O along the axis O. The anti-vibration device body 30 is arranged with a predetermined distance from the outer periphery. The first stopper 13c is a part for constituting a rebound-side stopper with the vibration-side bracket 20, and is opposed to a predetermined portion of the vibration-side bracket 20 with a predetermined interval. Located above.

  The vibration side bracket 20 is a member for connecting the engine side which is a vibration source and the vibration isolator main body 30, and is a metal casting product in the present embodiment. The vibration side bracket 20 includes a plate-like bracket body 21 in which a hole 21a into which the vibration isolator body 30 is inserted is formed in the thickness direction, and an outer side (side) in the axial direction from the periphery of the hole 21a of the bracket body 21. And a projecting portion 22 projecting toward the direction. The bracket body 21 is a part where a predetermined portion is fixed to the vibration source (engine side). The protrusion 22 is a part for forming a stopper that restricts the rebound displacement with the first stopper 13c on the support side bracket 10 side, and is provided with a predetermined distance from the first stopper 13c. 13c is disposed below.

  A pair of projecting portions 22 are arranged in parallel in the thickness direction (vertical direction in FIG. 1) with a predetermined interval, and a first stopper portion 23 made of a rubber-like elastic body is provided on the upper surface of the pair of projecting portions 22. It is fixed. A second stopper portion 24 made of a rubber-like elastic body is fixed to the lower surfaces of the pair of protruding portions 22. The distance between the upper surface and the lower surface of the pair of protrusions 22 is set to be approximately the same as the thickness of the bracket body 21. Since the thickness of each protrusion 22 is reduced and the pair of protrusions 22 are arranged side by side in the vertical direction, compared to the case where the protrusions 22 are formed to have substantially the same thickness as that of the bracket body 21. Thus, the mass of the protrusion 22 can be reduced, and the vibration-side bracket 20 can be reduced in weight.

  The first stopper rubber portion 23 is a member that is sandwiched between the first stopper 13c and cushions an impact when the vibration side bracket 20 is displaced to the rebound side, and the second stopper rubber portion 24 is a vibration member. When the side bracket 20 is displaced to the bound side, it is a member that is sandwiched between the second stopper 14 and cushions the impact. The second stopper 14 is a part for constituting a bound side stopper with the protruding portion 22, one end side is fixed to the vehicle body side, and the other end side is spaced apart from the lower surface of the protruding portion 22 by a predetermined distance. And located below the protrusion 22.

  The vibration isolator body 30 is a liquid-filled vibration isolator in which a liquid is sealed. The vibration isolator body 30 is attached to a shaft-like inner fixture 31 attached to the vehicle body side as a support and an engine side as a vibration source. A cylindrical outer fixture 32 and an anti-vibration base 33 made of a rubber-like elastic body that connects the outer fixture 32 and the inner fixture 31 are provided. The outer fixture 32 and the inner fixture 31 are arranged concentrically, and the outer fixture 32 is located on the radially outer side of the inner fixture 31.

  The inner fixture 31 is a boss fitting arranged on the axis O of the outer fixture 32, and is formed in a truncated cone shape. The inner fixture 31 has an outer peripheral surface 31a formed as a curved surface that is inserted into a bow toward the axis O along the axial direction. The inner fixture 31 is opened upward at the position of the axial center O of the head to form a bolt hole 31b. The bolt hole 31 b communicates with the mounting hole portion 11 a formed in the mounting portion 11 when the head of the inner mounting tool 31 comes into contact with the bottom of the mounting portion 11 of the support side bracket 10. The inner attachment tool 31 is attached to the attachment part 11 by screwing a bolt (not shown) inserted through the attachment hole part 11a into the bolt hole 31a.

  The outer fixture 32 is a cylindrical member arranged on the radially outer side of the inner fixture 31, and is fitted with a fitting portion 32c that fits into the hole 21a of the bracket body 21 (vibration side bracket 20). A diameter-reduced portion 32b that is coupled to the upper end of the portion 32c and that gradually decreases in diameter along the axis O (upper side in FIG. 1), and an approximate direction from the upper end of the reduced-diameter portion 32b toward the axis O. A bent portion 32a that is bent in the horizontal direction, a bay insertion portion 32d that is coupled to the lower end of the fitting portion 32c and that has a curved surface that extends into the circumferential direction toward the axis O; And a flange portion 32e that projects outward from the lower end of the insertion portion 32d in the radial direction. The fitting portion 32 c is positioned at a predetermined interval on the radially outer side of the bottom portion of the inner fixture 31, and the reduced diameter portion 32 b is spaced at a predetermined interval on the radially outer side of the head portion of the inner fixture 31. To position.

  The anti-vibration base body 33 is vulcanized and bonded to the outer peripheral surface 31a of the outer fixture 32 and the inner peripheral portion to the outer peripheral surface 31a of the inner fixture 31. The upper end side is formed in a truncated cone shape that gradually becomes larger in diameter toward the upper side in the axial direction (upper side in FIG. 1). Thereby, the vibration isolating base 33 has an outer wall inclined surface 33a whose outer wall facing the support side bracket 10 is inclined downward as it goes from the outer fixture 32 to the inner fixture 31, and the inner wall opposite to the outer wall is It has an inner wall inclined surface 33 b that is inclined downward from the outer fixture 32 toward the inner fixture 31.

  The anti-vibration base 33 includes a rubber film-like seal wall portion 33c that covers the fitting portion 32c of the outer fixture 32 and the inner peripheral surface of the bay portion 32d, and is coupled to the radially outer side of the inner wall inclined surface 33b. A rubber film portion 33d that covers the bottom of 31 is coupled to the radially inner side of the inner wall inclined surface 33b. The seal wall 33c is vulcanized and bonded to the inner peripheral surfaces of the fitting portion 32c and the baying portion 32d, and the rubber film portion 33d is vulcanized and bonded to the bottom of the inner fixture 31.

  The outer fixture 32 is caulked and fixed to the lower inner side of the outer fixture 32 by a baying portion 32d formed at the lower end of the fitting portion 32c. The cylindrical portion 34 is a member for disposing the diaphragm 35 and the partition body 36, and is disposed at the lower end in the axial direction of the outer fixture 32 via the seal wall portion 33c. The diaphragm 35 is a member for forming a liquid chamber in which a liquid (non-compressed fluid such as water or alkylene glycol) is sealed between the vibration isolating base 33, the inner wall inclined surface 33b of the vibration isolating base 33 and the rubber. Opposing to the film part 33d. The diaphragm 35 is integrally formed of a rubber-like elastic film having flexibility, and the outer periphery of a circular film part that causes displacement is vulcanized and bonded to the inner periphery of the cylindrical part 34. The diaphragm 35 is fixed to the outer fixture 32 by the bay insertion portion 32d through the cylindrical portion 34.

  The partition body 36 is a member for partitioning the liquid chamber into a plurality of parts. The partition body 36 is configured so that the liquid chamber is composed of a main liquid chamber L1 in which the vibration isolation base 33 forms a part of the chamber wall, and the diaphragm 35 is the chamber wall. It is partitioned into a sub liquid chamber L2 constituting a part. The partition body 36 is a member having an orifice forming portion 36a on the outer peripheral side and formed in a circular shape when viewed in the axial direction. An orifice 37 that connects the main liquid chamber L1 and the sub liquid chamber L2 is formed on the outer peripheral side of the partition body 36 by fitting the orifice forming portion 36a to the inner periphery of the outer fixture 32 through the seal wall portion 33c. It is formed. For example, the orifice 37 is tuned to a low frequency range (for example, about 5 to 15 Hz) corresponding to the shake vibration in order to attenuate the shake vibration when the vehicle travels. That is, the cross-sectional area, length, cross-sectional circumferential length, and the like of the orifice 37 are set so that the damping effect based on the resonance phenomenon of the liquid flowing through the orifice 37 is effectively exhibited when the shake vibration is input.

  In order to attach the vibration isolator main body 30 to the vibration side bracket 20, the outer fitting 32 of the vibration isolation device main body 30 is press-fitted into the hole 21 a formed in the bracket main body 21 of the vibration side bracket 20 from below. The outer fitting 32 has a reduced diameter portion 32b whose outer diameter is set smaller than that of the fitting portion 32c, and is continuous with the upper portion of the fitting portion 32c, so that the guide to the hole portion 21a can be facilitated. At the time of press-fitting, the upper surface of the flange portion 32e of the vibration isolator main body 30 fitted into the hole 21a is abutted against the lower surface of the bracket main body 21 around the hole 21a, so that the bracket main body 21, the vibration isolator main body 30, Further relative movement can be restricted. The vibration isolator body 30 press-fitted into the vibration side bracket 20 receives a downward static load of the vibration source (engine side) via the vibration side bracket 20, but has a flange portion 32 e, so the vibration isolator body The downward displacement of the vibration side bracket 20 relative to 30 can be regulated.

  According to the vibration isolator 1, when a low amplitude vibration occurs, the vibration is attenuated by the low dynamic spring characteristic of the vibration isolation base 33. When a shake vibration with a large amplitude occurs, the vibration is attenuated by the liquid flow effect by the orifice 37. Abnormal noise generated in the main liquid chamber L1 and the sub liquid chamber L2 due to cavitation or the like is transmitted to the support side bracket 10 (vehicle body side) through the vibration isolating base 33, so that the vibration isolating effect of the vibration isolating base 33 causes Abnormal noise transmitted can be dramatically suppressed.

  Further, the outer fixture 32 is disposed on the radially outer side of the inner fixture 32, and the vibration isolator base 33 has an inner wall inclined surface 33b and an outer wall inclined surface 33a from the outer fixture 32 to the inner fixture 31 (axis O). It is inclined downward as it goes. Therefore, the inner fixture 31 can be arranged at a predetermined interval on the radially inner side of the fitting portion 32c and the reduced diameter portion 32b of the outer fixture 32, and the height difference between the outer fixture 32 and the inner fixture 31 is reduced. it can.

  Here, in the conventional vibration isolator (anti-vibration apparatus disclosed in Patent Document 1), the outer attachment attached to the engine side is disposed above the inner attachment portion attached to the vehicle body side. It was. Therefore, when the engine-side attachment position is above the vehicle-body-side attachment position, the vertical length of the vibration-side bracket that connects the engine-side attachment position and the outer fixture is relatively small. it can. However, when the mounting position on the engine side is positioned substantially horizontally or below the mounting position on the vehicle body side, the difference in height between the mounting position on the engine side and the outer mounting tool is large. It was necessary to increase the vertical length of the vibration side bracket connecting the attachment position and the outer mounting tool. There has been a problem that the space saving performance of the vibration isolator deteriorates due to an increase in the vertical length of the vibration side bracket.

  On the other hand, according to the vibration isolator 1, the inner wall inclined surface 33 b and the outer wall inclined surface 33 a are inclined downward from the outer mounting tool 32 toward the inner mounting tool 31, so that the outer mounting tool 32 and the inner mounting tool 31. The difference in height with the can be reduced. As a result, even if the mounting position on the engine side of the vibration side bracket 20 is positioned substantially horizontally or below the mounting position on the vehicle body side of the support side bracket 10, the engine side and the outer mounting tool 32 The vertical length of the vibration side bracket 20 connecting the two can be reduced. Therefore, the space saving property of the vibration isolator 1 can be improved.

  Since the outer peripheral surface 31a of the inner fixture 31 is formed as a curved surface entering into a bow toward the axis O along the axial direction, the inserted curved surface is not formed on the outer peripheral surface 31a. Compared with (conical surface), the adhesion area of the vibration-proofing base 33 to which the inner peripheral surface is vulcanized and bonded to the outer peripheral surface 31a can be increased by the amount of the surface entering the axis O side.

  Further, the outer peripheral surface of the vibration isolating substrate 33 is vulcanized and bonded to the bent portion 32a of the outer fixture 32 and the inner peripheral surface of the reduced diameter portion 32b, and the bent portion to which the vibration isolating substrate 33 is vulcanized and bonded. The inner peripheral surfaces of 32a and the reduced diameter portion 32b are located on the outer side in the radial direction of the outer peripheral surface 31a or on the diagonally upper side on the outer side. The bottom side (the lower side in the axial direction) of the outer peripheral surface 13a and the inner peripheral surface of the bent portion 32a are opposed to each other so as to face each other. Therefore, when an axially downward load is input to the outer fixture 32 via the vibration side bracket 20, an oblique compressive stress connecting the inner fixture 31 and the outer fixture 32 is generated in the vibration isolation base 33. Thereby, the elastic support force on the engine side by the vibration isolating base 33 can be secured, and the durability of the vibration isolating base 33 can be secured.

  Further, since the bottom of the inner fixture 31 is covered with the rubber film portion 33d, the vibration isolating base 33 has a large relative displacement between the inner fixture 31 and the outer fixture 32, and the inner fixture 31 is separated from the inner fixture 31. Even if the body 36 interferes, the impact is buffered by the rubber film portion 33d. As a result, it is possible to suppress abnormal noise generated by the interference between the inner fixture 31 and the partition 36.

  In the vibration isolator 1, since the vibration isolator body 30 is suspended from the support bracket 10, the vibration isolator body 30 can be prevented from acting as a mass body of the vibration bracket 20. That is, when the vibration isolator main body 30 is suspended from the vibration side bracket 20, the vibration isolator main body 30 acts as a mass body of the vibration side bracket 20. As a result, the natural frequency of the vibration side bracket 20 decreases to the low frequency side by the amount of the mass body, and approaches the natural frequency of the vehicle body. As a result, the natural frequencies may interfere with each other and generate abnormal noise. On the other hand, according to the vibration isolator 1, the vibration isolator body 30 is suspended from the support side bracket 10 to prevent the vibration isolator body 30 from acting as a mass body of the vibration side bracket 20. Sound generation can be suppressed.

  The stopper portion 13 is inclined downward from the support side bracket 10 in a direction approaching the protruding portion 22, and the first stopper 13 c and the protruding portion 22 are opposed to each other on the upper and lower opposing surfaces (upper surface of the protruding portion 22). The first stopper rubber portion 23 is disposed. Therefore, when attaching the vibration isolator 1 to the support body (vehicle body) side and the vibration source (engine) side, an operation of separately providing a stopper rubber member between the support side bracket 10 and the outer mounting tool 32 can be omitted. Therefore, the mounting workability when mounting the vibration isolator 1 on the support side and the vibration source side can be improved.

  In addition, when a dynamic load on the bounce side is input to the vibration side bracket 20, the protruding portion 22 approaches the second stopper 14. When the second stopper rubber portion 24 is sandwiched between the protruding portion 22 and the second stopper 14, further displacement on the bounce side is restricted. In addition, when a dynamic load on the rebound side is input to the vibration side bracket 20, the protruding portion 22 approaches the first stopper 13 c. When the first stopper rubber portion 23 is sandwiched between the protruding portion 22 and the first stopper 13c, further displacement on the rebound side is restricted. Since the stopper 13 and the second stopper 14 can limit the excessive displacement of the vibration isolating base 33, the durability of the vibration isolating base 33 can be improved.

  In addition, the vertical distance between the upper surface of the protruding portion 22 to which the first stopper rubber portion 23 is fixed and the lower surface of the first stopper 13c is the vertical distance between the upper surface of the bent portion 32a of the outer fixture 32 and the lateral arm portion 13a. It is set smaller than the direction distance. Thereby, when a dynamic load on the rebound side is input to the vibration side bracket 20, the first stopper rubber portion 23 is pressed against the lower surface of the first stopper 13c, but the lateral arm portion 13a and the bent portion 32a (outside mounting) A predetermined gap is secured between the tool 32) and the interference between the lateral arm 13a and the bent part 32a is prevented. Since the vertical distance between the upper surface of the protruding portion 22 and the lower surface of the first stopper 13c can be arbitrarily set, the vertical distance between the horizontal arm portion 13a and the bent portion 32a is set according to the vertical distance. It is possible to avoid providing a useless gap between the lateral arm portion 13a and the bent portion 32a. As a result, by setting the gap between the horizontal arm portion 13a and the bent portion 32a to be small, the vertical distance between the horizontal arm portion 13a and the bent portion 32a can be set to be small accordingly. As a result, the degree of freedom in design can be ensured.

  Next, a second embodiment will be described with reference to FIG. In the first embodiment, the case where the liquid chamber is partitioned into the main liquid chamber L1 and the sub liquid chamber L2 by the partition 36 has been described. In contrast, in the second embodiment, a case where the liquid chamber is partitioned into the main liquid chamber L1 and the sub liquid chamber L2 by the partition body 41 and the elastic partition film 43 will be described. In addition, about the part same as the part demonstrated in 1st Embodiment, the same code | symbol is attached | subjected and the following description is abbreviate | omitted. FIG. 2 is an axial cross-sectional view of a vibration isolator 51 according to the second embodiment.

  As shown in FIG. 2, the vibration isolator 51 includes a support side bracket 10 attached to the vehicle body side as a support, a vibration side bracket 20 attached to the engine side as a vibration source, the vibration side bracket 20 and the support side bracket. 10 is provided with a vibration isolator main body 40 attached to 10.

  In the vibration isolator main body 40, the diaphragm 35 and the partition 41 are arranged at the lower end in the axial direction of the outer fixture 32 by the cylindrical portion 34. The partition body 41 is a member for partitioning the liquid chamber into a plurality of parts. The partition body 41 partitions the liquid chamber into a main liquid chamber L1 and a sub liquid chamber L2. The partition 41 is a member having an orifice forming portion 41a on the outer peripheral side and formed in a circular shape when viewed in the axial direction. The orifice forming portion 41a is fitted to the inner periphery of the outer fixture 32 through the seal wall portion 33c, so that the orifice 42 communicating the main liquid chamber L1 and the sub liquid chamber L2 is formed on the outer peripheral side of the partition body 41. It is formed. The orifice 42 is tuned so that a damping effect based on the resonance phenomenon of the liquid flowing through the orifice 42 is exhibited in a predetermined frequency range.

  The vibration isolator body 40 includes an elastic partition film 43 made of a rubber film that axially partitions the main liquid chamber L1 and the auxiliary liquid chamber L2 on the radially inner side of the partition body 41, and a displacement amount of the elastic partition film 43 in the film. And a pair of upper and lower lattice-shaped displacement restricting means 44 for restricting from both sides in the axial direction of the surface. Of the pair of displacement restricting means 44, the upper side (anti-vibration base 33 side) displacement restricting means 44 is provided integrally with the inner peripheral surface of the partition body 41.

  According to the vibration isolator 51, when a low amplitude vibration occurs, the vibration is attenuated by the low dynamic spring characteristic of the vibration isolation base 33. When vibration with a large amplitude occurs, the vibration is attenuated by the liquid flow effect by the orifice 42. On the other hand, when high-frequency vibration of fine vibration occurs, the low dynamic spring characteristic is exhibited by the reciprocating displacement of the elastic partition film 43. In addition, for the sound generated when the elastic partition film 43 collides with the displacement restricting means 44 and the abnormal sound generated in the liquid chamber due to cavitation, the outer fixture 32 and the inner fixture 31 connected to the support side bracket 10 are used. The vibration-isolating base 33 interposed therebetween can absorb the vibration caused by the hitting sound or abnormal noise and suppress the transmission of the hitting sound or abnormal noise into the vehicle interior.

  The present invention has been described above based on the embodiments. However, the present invention is not limited to the above embodiments, and various improvements and modifications can be made without departing from the spirit of the present invention. It can be easily guessed.

  In each of the above-described embodiments, the vibration isolator main bodies 30 and 40 in which the liquid chamber is divided into two (the main liquid chamber L1 and the sub liquid chamber L2) by the partition bodies 36 and 41 have been described. Of course, the vibration isolator main bodies 30 and 40 can be replaced with a known liquid-filled vibration isolator having a plurality of sub liquid chambers in addition to the main liquid chamber L1. In this case, the main liquid chamber L1 and the two liquid chambers of the plurality of sub liquid chambers can be communicated with each other by other orifices formed in the partitions 36 and 41.

  In each of the above embodiments, the first stopper rubber portion 23 is fixed to the protruding portion 22 in the protruding portion 22 and the first stopper 13c that function as a stopper with respect to the input of the dynamic load on the rebound side of the vibration side bracket 20. Explained the case. However, the present invention is not necessarily limited to this, and it is naturally possible to fix the first stopper rubber portion 23 to the lower surface of the first stopper 13c.

  Further, the case where the second stopper rubber portion 24 is fixed to the protruding portion 22 in the protruding portion 22 and the second stopper 14 that function as a stopper with respect to the input of the dynamic load on the bounce side of the vibration side bracket 20 has been described. However, the present invention is not necessarily limited to this, and it is naturally possible to fix the second stopper rubber portion 24 to the upper surface of the second stopper 14.

  In each of the above embodiments, the case where the support bracket 10 is provided with the stopper portion 13 for the input of the dynamic load on the rebound side of the vibration side bracket 20 has been described. However, the present invention is not necessarily limited to this, and it is naturally possible to provide a stopper on the vibration side bracket 20. In that case, the stopper portion is lifted and inclined from the vibration side bracket in a direction close to the support side bracket. And the stopper rubber part comprised from a rubber-like elastic body adheres to at least one of the opposing surfaces where the stopper part and the predetermined part of a support side bracket oppose up and down. Thereby, the effect | action and effect similar to said each embodiment are realizable.

  In each of the above embodiments, the case where the vibration isolators 1 and 51 are used as an engine mount that elastically supports an automobile engine has been described, but the present invention is not necessarily limited thereto. Naturally, it is possible to apply the anti-vibration devices 1 and 51 to various anti-vibration devices such as a body mount and a differential mount.

1,51 Vibration isolator 10 Support side bracket 13 Stopper 20 Vibration side bracket 22 Protruding part (part of vibration side bracket)
23 First stopper rubber part (stopper rubber part)
DESCRIPTION OF SYMBOLS 30 Anti-vibration apparatus main body 31 Inner attachment tool 32 Outer attachment tool 33 Anti-vibration base | substrate 33a Outer wall inclined surface (a part of outer wall)
33b Inner wall slope (part of inner wall)
36 partition body 37, 42 orifice 41 partition body (part of displacement regulating means)
43 Elastic partition film 44 Displacement restricting means L1 Main liquid chamber (part of liquid chamber)
L2 Sub liquid chamber (part of liquid chamber)

Claims (3)

In a vibration isolator comprising a support side bracket attached to the support side and a vibration side bracket attached to the vibration source side, and a vibration isolator body attached to the vibration side bracket and the support side bracket,
The vibration isolator main body includes an inner fixture attached to the support side bracket,
A cylindrical outer fixture disposed on the radially outer side of the inner fixture and attached to the vibration side bracket;
An anti-vibration base composed of a rubber-like elastic body that connects the outer fixture and the inner fixture;
A liquid chamber in which the anti-vibration base constitutes a part of a chamber wall and a liquid is enclosed;
A partition for partitioning the liquid chamber into a plurality;
An orifice communicating between the liquid chambers partitioned by the partition,
The anti-vibration substrate includes an inner wall inclined surface and an outer wall inclined surface in which an inner wall facing the liquid chamber and an outer wall opposite to the inner wall are inclined downward as they go from the outer fitting toward the inner fitting. An anti-vibration device characterized by that. The vibration isolator body is composed of a rubber-like elastic body and disposed between the liquid chambers, and a rubber-film-like elastic partition membrane;
The vibration isolator according to claim 1, further comprising a pair of displacement restricting means for restricting a displacement amount of the elastic partition film from both sides of the film surface. A stopper portion which is inclined downward from the support side bracket in a direction close to the vibration side bracket, or is inclined upward from the vibration side bracket in a direction close to the support side bracket;
The stopper portion and the vibration-side bracket or the support-side bracket are provided on at least one of the opposing surfaces that are vertically opposed to each other, and are provided with a stopper rubber portion that is made of a rubber-like elastic body. The vibration isolator according to claim 1 or 2.

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