JP2018115713A - Vibration isolation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress generation of noise caused by cavitation breakdown without lowering vibration isolation characteristics with a simple structure.SOLUTION: A restriction passage 24 includes: a first communication part 26 opening to a first liquid chamber; a second communication part 27 opening to a second liquid chamber; and a main body flow passage 25 for communicating the first communication part and the second communication part. Out of an internal surface of the main body flow passage, at a pair of opposing surfaces 25a opposing to each other, a plurality of projection parts 34 projecting in the opposing directions opposing to each other are provided along a flow passage direction of the main body flow passage 25. The projection part provided on one opposing surface and, out of the other opposing surface, a portion located between projection parts adjacent to each other in the flow passage direction oppose to each other in the opposing direction. An interval X between the pair of opposing surfaces is larger than two times of the projection height Y from the opposing surface of the projection part.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a vibration isolator that is applied to, for example, automobiles and industrial machines and absorbs and attenuates vibrations of a vibration generating unit such as an engine.

  Conventionally, as this type of vibration isolator, a cylindrical first attachment member connected to one of the vibration generating portion and the vibration receiving portion, a second attachment member connected to the other, and both of these attachments A configuration is known that includes an elastic body that couples members, and a partition member that partitions a liquid chamber in a first mounting member in which a liquid is sealed into a main liquid chamber and a sub liquid chamber. The partition member is formed with a restriction passage that communicates the main liquid chamber and the sub liquid chamber. In this vibration isolator, at the time of vibration input, both mounting members are relatively displaced while elastically deforming the elastic body, and the vibration is absorbed by changing the liquid pressure in the main liquid chamber and flowing the liquid through the restricted passage. And is decaying.

By the way, in this vibration isolator, for example, a large load (vibration) is input from the unevenness of the road surface, etc., and the load is input in the reverse direction due to the rebound of the elastic body after the fluid pressure in the main fluid chamber suddenly increases. Sometimes, the main liquid chamber is suddenly depressurized. Then, cavitation in which a large number of bubbles are generated in the liquid due to this sudden negative pressure is generated, and abnormal noise may be generated due to cavitation collapse in which the generated bubbles collapse.
Therefore, for example, by providing a valve body in the restriction passage as in the vibration isolator shown in Patent Document 1 below, the main liquid chamber can be negatively pressured even when large amplitude vibration is input. Suppressing configurations are known.

JP2012-172832A

  However, in the conventional vibration isolator, since the structure is complicated by providing the valve body, and tuning of the valve body is necessary, there is a problem that the manufacturing cost increases. Further, the provision of the valve body reduces the degree of freedom in design, and as a result, the vibration isolation characteristics may be reduced.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a vibration isolator capable of suppressing the occurrence of abnormal noise due to cavitation collapse without reducing the vibration isolation characteristics with a simple structure. To do.

In order to solve the above problems, the present invention proposes the following means.
A vibration isolator according to the present invention includes a cylindrical first mounting member coupled to one of a vibration generating unit and a vibration receiving unit, a second mounting member coupled to the other, and both the mounting members. An elastic body that elastically connects the liquid chamber, and a partition member that divides the liquid chamber in the first mounting member in which the liquid is sealed into a first liquid chamber and a second liquid chamber, and the partition member A liquid-filled vibration isolator having a restriction passage communicating the first liquid chamber and the second liquid chamber, wherein the restriction passage opens to the first liquid chamber. A second communication portion that opens to the second liquid chamber, and a main body channel that communicates the first communication portion and the second communication portion, and a pair of opposed inner surfaces of the main body channel. On the opposing surface, there are a plurality of protrusions protruding in the opposing direction facing each other along the channel direction of the main body channel. The protruding portion provided on one of the opposing surfaces and a portion of the other opposing surface located between the protruding portions adjacent to each other in the flow path direction are in the opposing direction. And the distance between the pair of facing surfaces is greater than twice the height of the protrusion protruding from the facing surface.

According to the present invention, at the time of vibration input, both the attachment members are relatively displaced while elastically deforming the elastic body, the liquid pressure in the first liquid chamber and the second liquid chamber fluctuates, and the liquid passes through the restriction passage. An attempt is made to flow between the first liquid chamber and the second liquid chamber. At this time, the liquid flows into the restriction passage through one of the first communication portion and the second communication portion, passes through the main body flow path, and then passes through the other of the first communication portion and the second communication portion. Spill from.
Here, when a large load (vibration) is input to the vibration isolator, the liquid circulates through the main body channel while colliding with the protrusions provided on the pair of opposed surfaces, so that the liquid collides with the protrusions. It is possible to increase the pressure loss of the liquid flowing through the restricted passage, and the first communication portion and the second communication portion. The flow rate of the liquid passing through can be reduced. As a result, between the liquid that has passed through one of the first communication portion and the second communication portion and has flowed into the first liquid chamber or the second liquid chamber, and the liquid in the first liquid chamber or the second liquid chamber. The flow velocity difference caused by the vortex can be kept small, and the generation of vortices due to the flow velocity difference and the generation of bubbles due to the vortices can be suppressed.
In addition, since the interval between the pair of opposing surfaces in the main body channel is larger than twice the height of the protrusion from the opposing surface, the main channel can flow without interfering with the projections. An area extending in the road direction is secured. Therefore, when a normal load is input to the vibration isolator, it is possible to make the above-described pressure loss difficult to occur, and the desired vibration isolating characteristics can be stably exhibited.

  Here, at least one of the first communication portion and the second communication portion opens into the first liquid chamber or the second liquid chamber in a direction orthogonal to the flow path direction and the facing direction. Also good.

  In this case, the liquid flowing along the protrusion in the main body flow path is bent at a right angle, and the first liquid chamber or the second liquid is supplied from one of the first communication portion and the second communication portion. It will flow into the liquid chamber. Therefore, even if a large load is input to the vibration isolator, the flow rate of the liquid flowing into the first liquid chamber or the second liquid chamber can be reliably reduced.

  In addition, at least one of the first communication part and the second communication part may include a plurality of pores that pass through a barrier facing the first liquid chamber or the second liquid chamber.

  In this case, when the liquid flows into the first liquid chamber or the second liquid chamber through the plurality of pores provided in one of the first communication portion and the second communication portion, these pores are formed. Since each pore circulates while being subjected to pressure loss by the formed barrier, the flow rate of the liquid flowing into the first liquid chamber or the second liquid chamber can be suppressed. In addition, since the liquid flows through a plurality of pores instead of a single pore, it is possible to divide the liquid into a plurality of channels and reduce the flow rate of the liquid that has passed through the individual pores. Can do. Furthermore, even if bubbles are generated in the restricted passage, since a plurality of pores are arranged, the generated bubbles can be separated from each other in the first liquid chamber or the second liquid chamber, and the bubbles merge. Thus, the growth can be suppressed and the bubbles can be easily maintained in a finely dispersed state.

  In addition, at least one of the first communication portion and the second communication portion may be configured such that, in the main body flow path, a plurality of the protrusions are disposed along the flow path direction from the portion in the flow path direction. You may open in the distant part.

  In this case, when a large load is input to the vibration isolator, the liquid is allowed to flow into the first liquid chamber or the second liquid chamber after the flow velocity of the liquid is reduced as described above by the plurality of protrusions. it can. Therefore, even if a large load is input to the vibration isolator, the flow rate of the liquid flowing into the first liquid chamber or the second liquid chamber can be further reliably reduced.

  According to the present invention, it is possible to suppress the generation of abnormal noise caused by cavitation collapse without reducing the vibration isolation characteristics with a simple structure.

It is a longitudinal cross-sectional view of the vibration isolator which concerns on one Embodiment of this invention. It is a top view of the partition member which comprises the vibration isolator shown in FIG.

Hereinafter, an embodiment of a vibration isolator according to the present invention will be described with reference to FIGS. 1 and 2.
As shown in FIG. 1, the vibration isolator 10 includes a cylindrical first attachment member 11 connected to one of the vibration generating unit and the vibration receiving unit, and one of the vibration generating unit and the vibration receiving unit. The second mounting member 12 to be connected, the elastic body 13 that elastically connects the first mounting member 11 and the second mounting member 12 to each other, and the main liquid chamber (first liquid chamber) to be described later in the first mounting member 11 ) 14 and a partition member 16 that divides into a secondary liquid chamber (second liquid chamber) 15.

Hereinafter, the direction along the central axis O of the first mounting member 11 is referred to as an axial direction. Further, the second mounting member 12 side along the axial direction is referred to as an upper side, and the partition member 16 side is referred to as a lower side. Further, in a plan view of the vibration isolator 10 viewed from the axial direction, a direction orthogonal to the central axis O is referred to as a radial direction, and a direction around the central axis O is referred to as a circumferential direction.
The first mounting member 11, the second mounting member 12, and the elastic body 13 are each formed in a circular shape or an annular shape in a plan view, and are disposed coaxially with the central axis O.

  When the vibration isolator 10 is mounted on, for example, an automobile, the second mounting member 12 is connected to an engine as a vibration generating unit, and the first mounting member 11 is connected to a vehicle body as a vibration receiving unit. This suppresses transmission of engine vibration to the vehicle body.

  The second mounting member 12 is a columnar member extending in the axial direction, and is formed in a hemispherical shape whose lower end bulges downward, and a flange 12a above the lower end of the hemispherical shape. have. A screw hole 12b extending downward from the upper end surface of the second mounting member 12 is formed, and a bolt (not shown) serving as an engine-side mounting tool is screwed into the screw hole 12b. The second mounting member 12 is disposed in the upper end opening of the first mounting member 11 via the elastic body 13.

  The elastic body 13 is a rubber body that is vulcanized and bonded to the upper end opening of the first mounting member 11 and the outer peripheral surface of the lower portion of the second mounting member 12, respectively, and interposed between them. The upper end opening of the mounting member 11 is closed from above. The elastic body 13 is sufficiently in close contact with the second mounting member 12 by the upper end of the elastic body 13 coming into contact with the flange portion 12a of the second mounting member 12, and follows better due to the displacement of the second mounting member 12. ing. A rubber film 17 is integrally formed on the lower end portion of the elastic body 13 to liquid-tightly cover the inner peripheral surface of the first mounting member 11 and the inner peripheral portion of the lower end opening edge. As the elastic body 13, an elastic body made of synthetic resin or the like can be used in addition to rubber.

  The first attachment member 11 is formed in a cylindrical shape having a flange 18 at a lower end portion, and is connected to a vehicle body or the like as a vibration receiving portion via the flange 18. A portion of the inside of the first attachment member 11 located below the elastic body 13 is a liquid chamber 19. In the present embodiment, a partition member 16 is provided at the lower end portion of the first attachment member 11, and a diaphragm 20 is further provided below the partition member 16. The upper surface of the outer peripheral portion 22 of the partition member 16 is in contact with the lower end opening edge of the first mounting member 11.

  The diaphragm 20 is made of an elastic material such as rubber or soft resin, and has a bottomed cylindrical shape. The upper end portion of the diaphragm 20 is sandwiched between the lower surface of the outer peripheral portion 22 of the partition member 16 and the ring-shaped holder 21 positioned below the partition member 16 in the axial direction. The lower end portion of the rubber film 17 is in liquid-tight contact with the upper surface of the outer peripheral portion 22 of the partition member 16.

  Under such a configuration, the outer peripheral portion 22 of the partition member 16 and the holder 21 are arranged in this order on the lower end opening edge of the first mounting member 11 in this order downward, and are fixed integrally with the screw 23. Thus, the diaphragm 20 is attached to the lower end opening of the first attachment member 11 via the partition member 16. In the illustrated example, the bottom portion of the diaphragm 20 has a shape that is deep on the outer peripheral side and shallow at the center. However, as the shape of the diaphragm 20, various conventionally known shapes can be adopted in addition to such a shape.

  As described above, the liquid chamber 19 is formed in the first mounting member 11 by attaching the diaphragm 20 to the first mounting member 11 via the partition member 16 in this manner. The liquid chamber 19 is disposed in the first mounting member 11, that is, inside the first mounting member 11 in plan view, and is a sealed space that is liquid-tightly sealed by the elastic body 13 and the diaphragm 20. . The liquid chamber 19 is filled (filled) with the liquid L.

  The liquid chamber 19 is divided into a main liquid chamber 14 and a sub liquid chamber 15 by a partition member 16. The main liquid chamber 14 is formed by using the lower surface 13a of the elastic body 13 as a part of the wall surface. The rubber film 17 and the partition member 16 that cover the elastic body 13 and the inner peripheral surface of the first mounting member 11 in a liquid-tight manner. And the inner volume changes due to the deformation of the elastic body 13. The auxiliary liquid chamber 15 is a space surrounded by the diaphragm 20 and the partition member 16, and the internal volume changes due to the deformation of the diaphragm 20. The vibration isolator 10 having such a configuration is a compression-type device that is mounted and used so that the main liquid chamber 14 is positioned on the upper side in the vertical direction and the auxiliary liquid chamber 15 is positioned on the lower side in the vertical direction. .

  The partition member 16 is provided with a restriction passage 24 that allows the main liquid chamber 14 and the sub liquid chamber 15 to communicate with each other. As shown in FIG. 2, the restriction passage 24 includes a main body flow path 25 disposed in the partition member 16, a first communication portion 26 that connects the main body flow path 25 and the main liquid chamber 14, and a main body flow path. 25 and a second communication portion 27 that communicates the auxiliary liquid chamber 15 with each other.

  The main body flow path 25 extends along the circumferential direction in the partition member 16, and the flow path direction and the circumferential direction of the main body flow path 25 are in the same direction. In addition, the main body flow path 25 may extend in a direction intersecting the circumferential direction. The main body flow path 25 is formed in an arc shape arranged coaxially with the central axis O, and extends over substantially the entire circumference of the partition member 16 along the circumferential direction. The main body flow path 25 is defined by a first barrier 28 facing the main liquid chamber 14 and a second barrier 29 facing the sub liquid chamber 15 in the partition member 16. Both the first barrier 28 and the second barrier 29 are formed in a plate shape whose front and back surfaces face the axial direction. The first barrier 28 is sandwiched between the main body flow path 25 and the main liquid chamber 14 in the axial direction, and is positioned between the main body flow path 25 and the main liquid chamber 14. The second barrier 29 is sandwiched between the main body flow path 25 and the auxiliary liquid chamber 15 in the axial direction, and is positioned between the main body flow path 25 and the auxiliary liquid chamber 15.

The second communication portion 27 includes one opening 32 that penetrates the second barrier 29 in the axial direction. The opening 32 is disposed in a portion of the second barrier 29 that forms one end along the circumferential direction of the main body flow path 25.
The first communication portion 26 includes a plurality of pores 31 that penetrate the first barrier 28 in the axial direction and are arranged along the circumferential direction (the flow path direction of the main body flow path 25). The plurality of pores 31 are disposed in a portion of the first barrier 28 that forms the other end along the circumferential direction of the main body flow path 25. At least some of the plurality of pores 31 form a row of holes arranged on a concentric circle with the central axis O as the center and spaced in the circumferential direction.
In the following, along the circumferential direction, the one end side of the main body channel 25 is referred to as one side, and the other end side is referred to as the other side.

Each of the plurality of pores 31 is smaller than the channel cross-sectional area of the main body channel 25 and is disposed inside each of the first barrier 28 and the main body channel 25 in plan view. In the illustrated example, the lengths of the plurality of pores 31 are equal to each other. The inner diameters of the plurality of pores 31 are equal to each other. The lengths and the inner diameters of the plurality of pores 31 may be different from each other.
A plurality of the pores 31 are formed in the first barrier 28 at intervals in the radial direction. That is, a plurality of the hole arrays are arranged in the first barrier 28 with a space in the radial direction. In the example shown in the figure, two pores 31 are formed in the first barrier 28 with a gap in the radial direction. The pores 31 adjacent to each other in the radial direction are arranged with their circumferential positions shifted from each other. Note that the plurality of pores 31 may be disposed in the first barrier 28 at radial positions at equal positions along the circumferential direction.

Each of the plurality of pores 31 is gradually reduced in diameter along the axial direction from the main body flow path 25 side to the main liquid chamber 14 side, that is, from the inner side to the outer side in the axial direction, and the taper angle is, for example, about 30 The opening end on the main liquid chamber 14 side (hereinafter referred to as “opening end”) is the smallest part of the inner diameter and the flow path cross-sectional area. The opening area of the opening end of the pore 31 may be, for example, 25 mm ² or less, preferably 2 mm ² or more and 8 mm ² or less.
In addition, the flow path cross-sectional area of the entire first communication portion 26 obtained by adding the opening areas at the open ends of the plurality of fine holes 31 for all of the plurality of fine holes 31 is the minimum value of the flow path cross-sectional area of the main body flow path 25. For example, it may be 1.8 times or more and 4.0 times or less.

In the present embodiment, a plurality of protrusions 34 projecting in the facing directions facing each other are provided on the pair of facing surfaces 25a facing each other among the inner surfaces of the main body flow path 25 along the circumferential direction.
In the illustrated example, the protrusions 34 are formed on a pair of opposed surfaces 25 a that are radially opposed to each other on the inner surface of the main body flow path 25. Thus, the direction in which the first communication portion 26 opens into the main liquid chamber 14 coincides with the circumferential direction and the direction orthogonal to the facing direction. Further, the direction in which the second communication portion 27 opens into the auxiliary liquid chamber 15 also coincides with the circumferential direction and the direction orthogonal to the facing direction.

In addition, you may change suitably the protrusion 34, for example in the inner surface of the main body flow path 25, for example, forming in a pair of opposing surface which mutually opposes an axial direction. In this configuration, the direction in which the first communication portion 26 and the second communication portion 27 open to the main liquid chamber 14 or the sub liquid chamber 15 may be the radial direction.
Further, only the first communication portion 26 of the first communication portion 26 and the second communication portion 27 may be opened in the main liquid chamber 14 in the circumferential direction and the direction orthogonal to the facing direction, or the first Both the communication portion 26 and the second communication portion 27 may be opened in the main liquid chamber 14 or the sub liquid chamber 15 in a direction different from the circumferential direction and the direction orthogonal to the facing direction.

  The plurality of protrusions 34 have the same shape and the same size. In the illustrated example, the plurality of protrusions 34 have the same shape and the same size. The protrusion 34 has a triangular shape in which two of the three corners are located on the facing surface 25 a of the main body flow path 25 when viewed from the axial direction. In the illustrated example, the protrusion 34 has an isosceles triangle shape with an apex angle being an obtuse angle when viewed from the axial direction. The protrusion 34 is disposed on the inner surface of the main body flow path 25 over a half circumference of the main body flow path 25. The plurality of protrusions 34 are arranged in the circumferential direction.

A protrusion 34 provided on one facing surface 25a and a portion of the other facing surface 25a located between the protrusions 34 adjacent to each other in the circumferential direction face each other in the facing direction. Yes. In the example shown in the drawing, the top of the protrusion 34 provided on one facing surface 25a is located on the portion of the other facing surface 25a located between the protrusions 34 adjacent to each other in the circumferential direction. Are facing each other. In the configuration described above, the planar view shape of a portion (hereinafter, referred to as a protrusion region) in which a plurality of protrusions 34 are disposed along the circumferential direction in the main body flow path 25 is circumferentially bent in the radial direction. It has a wave shape that extends. In the illustrated example, the shape of the projection region of the main body channel 25 in plan view is a wave shape extending in the circumferential direction while being bent in the radial direction with the same amplitude and the same period over the entire circumference. .
And the space | interval X between a pair of opposing surfaces 25a is larger than 2 times the protrusion height Y from the opposing surface 25a of the protrusion 34. FIG. The interval X is defined between the virtual surfaces in which the non-arranged portions of the protrusions 34 or the connection portions with the protrusions 34 extend in the circumferential direction (flow channel direction) in each of the pair of opposing surfaces 25a. The radial distance in the projecting region. The protrusion height Y is a radial distance from the virtual surface to the top of the protrusion 34.

  At least one of the first communication portion 26 and the second communication portion 27 is open to a portion of the main body flow path 25 that is away from the protrusion region in the circumferential direction. In the example shown in the drawing, the first communication portion 26 opens from the portion of the main body channel 25 that extends from the other side in the circumferential direction to the protruding region to the region that extends from the other circumferential edge. Yes. The second communication portion 27 opens from a portion of the main body flow path 25 that extends from one side in the circumferential direction to the protruding region to a region that extends from one end in the circumferential direction. The circumferential lengths of the first communication portion 26 and the second communication portion 27 are shorter than the circumferential length in the projecting region of the main body flow path 25. The circumferential length of the first communicating portion 26 is longer than the circumferential length of the second communicating portion 27.

  Of the inner surface of the main body flow path 25, the end of the bottom surface facing the main liquid chamber 14 along the axial direction is gradually flown in the axial direction as it goes from one side of the circumferential direction to the other side. An inclined surface 25b for narrowing the road width is formed. The circumferential length of the inclined surface 25b is the length in the circumferential direction of the region extending from the portion of the main body channel 25 that is continuous with the other side in the circumferential direction to the protruding region to the other edge in the circumferential direction. It is about half of that. The inclined surface 25 b reaches the end edge on the other side in the circumferential direction of the main body flow path 25. Of the main body channel 25, the axial channel width at the other edge in the circumferential direction is about half of the axial channel width in the other part.

  In the vibration isolator 10 having such a configuration, both attachment members 11 and 12 are relatively displaced while elastically deforming the elastic body 13 at the time of vibration input. Then, the liquid pressure in the main liquid chamber 14 fluctuates, the liquid L in the main liquid chamber 14 flows into the sub liquid chamber 15 through the restriction passage 24, and the liquid L in the sub liquid chamber 15 flows into the restriction passage 24. Through the main liquid chamber 14.

  And according to the vibration isolator 10 which concerns on this embodiment, when a big load (vibration) is input, the liquid L will collide with the protrusion 34 provided in a pair of opposing surface 25a, and the main body flow path 25 is made. Since the liquid L circulates, the energy loss due to the collision of the liquid L with the protrusion 34, the energy loss due to the friction between the liquid L and the protrusion 34, and the like occur, so that the pressure loss of the liquid L flowing through the restriction passage 24 occurs. And the flow velocity of the liquid L passing through the first communication portion 26 and the second communication portion 27 can be reduced. Accordingly, the liquid L that has passed through one of the first communication portion 26 and the second communication portion 27 and has flowed into the main liquid chamber 14 or the sub liquid chamber 15, and the main liquid chamber 14 or the sub liquid chamber 15. The difference in flow velocity generated between the liquid L and the liquid L can be suppressed, and the generation of vortices due to the flow velocity difference and the generation of bubbles due to the vortices can be suppressed.

  Further, since the distance X between the pair of opposed surfaces 25a in the main body flow path 25 is larger than twice the protruding height Y of the protruding portion 34 from the opposed surface 25a, A region extending in the circumferential direction without interfering with the portion 34 is secured. Therefore, when a normal load is input to the vibration isolator 10, it is possible to make the above-mentioned pressure loss difficult to occur, and the desired vibration isolating characteristics can be stably exhibited.

  Further, since the first communication portion 26 and the second communication portion 27 are open to the main liquid chamber 14 or the sub liquid chamber 15 in the circumferential direction and the axial direction orthogonal to the facing direction, The liquid L flowing along the projection 34 is bent at a right angle and flows into the main liquid chamber 14 or the sub liquid chamber 15 from one of the first communication portion 26 and the second communication portion 27. Will be. Therefore, even if a large load is input to the vibration isolator 10, the flow rate of the liquid L flowing into the main liquid chamber 14 or the sub liquid chamber 15 can be reliably reduced.

  Further, when the liquid L flows into the main liquid chamber 14 through the plurality of pores 31, each of the pores 31 is circulated while being subjected to pressure loss by the first barrier 28 in which these pores 31 are formed. The flow rate of the liquid L flowing into the main liquid chamber 14 can be suppressed. In addition, since the liquid L circulates through the plurality of pores 31 instead of the single pore 31, the liquid L can be branched and circulated, and the liquid L that has passed through the individual pores 31 can be circulated. The flow rate of can be reduced. Furthermore, even if bubbles are generated in the restriction passage 24, since the plurality of pores 31 are arranged, the generated bubbles can be separated from each other in the main liquid chamber 14, and the bubbles merge. The growth can be suppressed and the bubbles can be easily maintained in a finely dispersed state.

  Moreover, since the 1st communication part 26 and the 2nd communication part 27 are opened in the part away from the said protrusion area | region in the circumferential direction among the main body flow paths 25, a big load is input into the vibration isolator 10. When the flow rate of the liquid L is reduced by the plurality of protrusions 34 as described above, the liquid L can be flowed into the main liquid chamber 14 or the sub liquid chamber 15. Therefore, even if a large load is input to the vibration isolator 10, the flow rate of the liquid L flowing into the main liquid chamber 14 or the sub liquid chamber 15 can be reduced more reliably.

  The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

For example, the shape of the protrusion 34 viewed from the axial direction is not limited to a triangular shape, and may be appropriately changed to a semicircular shape or a square shape. The circumferential lengths of the first communication portion 26 and the second communication portion 27 may be equal to or longer than the circumferential length in the protruding region of the main body flow path 25. Further, the circumferential length of the first communication portion 26 may be equal to or less than the circumferential length of the second communication portion 27. Further, the protrusion 34 may be disposed on the inner surface of the main body flow path 25 over less than a half circumference of the main body flow path 25 or may be disposed over the entire circumference of the main body flow path 25. The plurality of protrusions 34 may be arranged at intervals in the circumferential direction.
Further, at least a part of each of the first communication portion 26 and the second communication portion 27 may be opened in the protruding region of the main body flow path 25.
Moreover, you may form the inclined surface 25b in the edge part of the one side along the circumferential direction in the top | upper surface which faces the secondary liquid chamber 15 side along an axial direction among the inner surfaces of the main body flow path 25. FIG. Further, the inclined surface 25 b may not be disposed on the inner surface of the main body flow path 25.

In the above embodiment, the pores 31 are formed in the first barrier 28, but may be formed in the second barrier 29, or may be formed in both the first barrier 28 and the second barrier 29. .
Moreover, in the said embodiment, although the pore 31 was formed in the truncated cone shape which diameter is gradually reduced, you may form in a column shape (straight circular hole shape).
Moreover, in the said embodiment, although the several fine pore 31 was formed in the cross-sectional view circular shape, this invention is not limited to this. For example, the plurality of pores 31 may be appropriately changed, for example, formed in a cross-sectional viewing angle shape.
Moreover, in the said embodiment, although the 1st communication part 26 is provided with the some pore 31, for example, the structure which does not have the pore 31, or a larger diameter opening than the pore 31, and both the pores 31 You may employ | adopt the structure etc. which have. Moreover, the 2nd communication part 27 may be provided with the some opening part 32 arrange | positioned along the circumferential direction (flow path direction of the main body flow path 25).

  Moreover, in the said embodiment, although the partition member 16 is arrange | positioned in the lower end part of the 1st attachment member 11, and the outer peripheral part 22 of the partition member 16 is made to contact | abut to the lower end opening edge of the 1st attachment member 11, for example, partition The member 16 is disposed sufficiently above the lower end opening edge of the first mounting member 11, and the diaphragm 20 is disposed on the lower side of the partition member 16, that is, the lower end portion of the first mounting member 11. The sub liquid chamber 15 may be formed from the lower end of 11 to the bottom surface of the diaphragm 20.

Moreover, in the said embodiment, although the compression type vibration isolator 10 which a positive pressure acts on the main liquid chamber 14 by the support load acting was demonstrated, the main liquid chamber 14 is located in the vertical lower side, and The auxiliary liquid chamber 15 is mounted so as to be positioned on the upper side in the vertical direction, and can be applied to a suspension type vibration isolator in which a negative pressure is applied to the main liquid chamber 14 when a support load is applied.
Moreover, in the said embodiment, although the partition member 16 partitioned off the liquid chamber 19 in the 1st attachment member 11 into the main liquid chamber 14 and the sub liquid chamber 15 which have the elastic body 13 in a part of wall surface. However, it is not limited to this. For example, instead of providing the diaphragm 20, the elastic body 13 may be provided, and instead of providing the secondary liquid chamber 15, a pressure receiving liquid chamber having the elastic body 13 at a part of the wall surface may be provided. For example, the partition member 16 partitions the liquid chamber 19 in the first mounting member 11 in which the liquid L is sealed into the first liquid chamber 14 and the second liquid chamber 15, and the first liquid chamber 14 and the second liquid chamber 15. At least one of the above can be appropriately changed to another configuration having the elastic body 13 in a part of the wall surface.
The vibration isolator 10 according to the present invention is not limited to an engine mount of a vehicle, and can be applied to other than the engine mount. For example, the present invention can be applied to a mount of a generator mounted on a construction machine, or can be applied to a mount of a machine installed in a factory or the like.

  In addition, it is possible to appropriately replace the constituent elements in the embodiment with known constituent elements without departing from the spirit of the present invention, and the above-described modified examples may be appropriately combined.

DESCRIPTION OF SYMBOLS 10 Vibration isolator 11 1st attachment member 12 2nd attachment member 13 Elastic body 14 Main liquid chamber (1st liquid chamber)
15 Secondary liquid chamber (second liquid chamber)
16 Partition member 19 Liquid chamber 24 Restriction passage 25 Main body flow passage 25a Opposing surface 26 First communication portion 27 Second communication portion 28 First barrier 29 Second barrier 31 Pore 34 Projection L Liquid X Interval Y Projection height

Claims (4)

A cylindrical first mounting member coupled to one of the vibration generating unit and the vibration receiving unit, and a second mounting member coupled to the other;
An elastic body that elastically connects both the mounting members;
A partition member that divides the liquid chamber in the first mounting member in which the liquid is sealed into a first liquid chamber and a second liquid chamber, and
A liquid-sealed vibration isolator in which a restriction passage communicating the first liquid chamber and the second liquid chamber is formed in the partition member,
The restriction passage includes a first communication portion that opens to the first liquid chamber, a second communication portion that opens to the second liquid chamber, and a main body channel that communicates the first communication portion and the second communication portion. With
Of the inner surface of the main body channel, a pair of opposing surfaces facing each other is provided with a plurality of protrusions protruding in the facing direction facing each other along the channel direction of the main body channel,
The projections provided on one of the opposing surfaces and the portion of the other opposing surface located between the projections adjacent to each other in the flow path direction oppose each other in the opposing direction. And
An anti-vibration device according to claim 1, wherein an interval between the pair of opposing surfaces is greater than twice a protruding height of the protruding portion from the opposing surface.   At least one of the first communication portion and the second communication portion is open to the first liquid chamber or the second liquid chamber in a direction orthogonal to the flow path direction and the facing direction. The vibration isolator according to claim 1, wherein   2. The at least one of the first communication part and the second communication part includes a plurality of pores penetrating a barrier facing the first liquid chamber or the second liquid chamber. 2. The vibration isolator according to 2.   At least one of the first communication portion and the second communication portion is separated in the flow channel direction from a portion of the main body flow channel where the plurality of protrusions are disposed along the flow channel direction. The vibration isolator according to any one of claims 1 to 3, wherein the anti-vibration device has an opening in the portion.

Images