WO2014091783A1

WO2014091783A1 - Antivibration device

Info

Publication number: WO2014091783A1
Application number: PCT/JP2013/067565
Authority: WO
Inventors: 坂田　利文
Original assignee: 東洋ゴム工業株式会社
Priority date: 2012-12-10
Filing date: 2013-06-26
Publication date: 2014-06-19
Also published as: CN104541087B; JP2014114866A; CN104541087A

Abstract

An upper attachment member (10) is attached to the side of a power plant (PP), and a lower attachment member (20) is attached to the side of a vehicle body frame (BF). An anti-vibration base body (30) configured from an elastic rubber member is interposed non-adhesively between the lower attachment member (20) and the upper attachment member (10). By means of recessed parts (38, 39) recessed in the inner peripheral surface of a through-hole (30a), when the anti-vibration base body (30) is compressed vertically, the anti-vibration base body (30) deforms by widening outwards. As a result, the bottom end of the anti-vibration base body (30) of the non-adhesive structure which deforms upon compression can be made less prone to separate from the lower attachment member (20).

Description

Vibration isolator

The present invention relates to a vibration isolator, and more particularly to a vibration isolator capable of making it difficult to separate a non-adhesive anti-vibration base from an attachment member.

Conventionally, there has been known an anti-vibration device that is interposed between members constituting a vibration transmission system and mutually anti-vibrates and connects these members. As a vibration isolator applied to an engine mount for an automobile, a first attachment member attached to a power plant side such as an engine and a second attachment member attached to a vehicle body frame side are made of a rubber-like elastic material. Some are elastically connected by a vibration-proof substrate. In recent years, in order to manufacture a vibration isolator at low cost, a structure has been proposed in which a vibration isolator base is assembled between a first mounting member and a second mounting member in a non-adhesive manner (Patent Document 1).

JP 2011-247331 A

However, in the above prior art, since the vibration isolating base is assembled to the first and second mounting members without adhesion, there is a risk that the vibration isolating base may be separated from the mounting member when vibration is input. There was a risk that the anti-vibration performance would deteriorate or abnormal noise would occur.

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a vibration isolator capable of making it difficult to separate a vibration isolating base having a non-adhesive structure from an attachment member.

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 upper mounting member is mounted on the power plant side by the bracket whose lower end side is fixed to the power plant side, and the lower mounting member is mounted on the vehicle body frame side. It is attached. An anti-vibration base composed of a rubber-like elastic material is interposed between the lower mounting member and the upper mounting member without bonding. A lower through-hole is formed in the vertical direction of the lower mounting member. The bracket is penetrated through the lower through-hole, and the lower end side of the shaft-like member is fixed to the bracket, while the upper end side of the shaft-like member is inserted and fixed in a hole provided in the upper mounting member.

The lower mounting member has an extending portion extending from the periphery of the lower through hole in a direction intersecting with the vertical direction, and the lower end portion of the vibration isolating base is in contact with the extending portion. On the other hand, the upper end portion of the vibration isolating base abuts on the upper mounting member. The vibration isolating base includes a communication hole that allows the lower end and the upper end to communicate in the vertical direction, and the bracket and the shaft-shaped member are provided through the communication hole. Via the upper mounting member and the upper end of the vibration-proof base.

Since the lower end portion of the vibration isolating base is received by the extending portion of the lower mounting member, the vibration isolating base is elastically deformed in the vertical direction by the vertical vibration on the power plant side, and the upper mounting member and the lower mounting member A relative displacement in the vertical direction occurs between the two. Since the anti-vibration base is provided with a concave portion extending in the direction intersecting the vertical direction on the inner peripheral surface of the communication hole, when the anti-vibration base is compressed in the vertical direction, the anti-vibration base is directed in the direction toward the concave portion, That is, it is deformed while expanding in a direction intersecting with the vertical direction.

Thereby, it is possible to suppress the lower end portion of the vibration-isolating base that is compressively deformed from dropping from the lower through-hole formed in the lower mounting member, and to adhere the vibration-isolating base to the extending portion. As a result, there is an effect that it is difficult to separate the vibration-proof base from the extending portion (lower mounting member).

According to the vibration isolator of claim 2, the convex portion is provided on the outer peripheral surface of the vibration isolating base in a direction crossing the vertical direction. In addition to the effect of claim 1, by providing the vibration-proof base between the lower mounting member and the upper mounting member in the state where the vertical compressive load is input, in the direction in which the convex portion protrudes. There is an effect that the spring constant of the vibration-proof base can be improved.

According to the vibration isolator of claim 3, the extending portion of the lower mounting member includes the lower inclined portion that expands outward as it goes upward, and the lower end portion of the vibration isolating base contacts the lower inclined portion. On the other hand, the upper mounting member includes an upper restricting portion that restricts deformation of the upper end portion toward the inside, and the upper end portion of the vibration-proof base abuts on the upper restricting portion. The upper restricting portion is opposed to the lower inclined portion, and at least part of the upper restricting portion is located near the center of the communication hole with respect to the lower inclined portion in the horizontal direction. The anti-vibration base interposed between the member and the upper mounting member has an effect of being able to reliably apply a vertical compressive load by the upper restricting portion and the lower inclined portion.

According to the vibration isolator of the present invention, the anti-vibration base protrudes upward from the upper end portion, and the protruded portion is inserted into the upper through hole formed through the upper mounting member in the vertical direction. Stopped. Although the upper mounting member and the vibration isolating base are not bonded, the upper mounting member and the vibration isolating base can be temporarily fixed by inserting and locking the protruding portion into the upper through hole. Thereby, in addition to the effect of any one of claims 1 to 3, when assembling the upper mounting member and the vibration isolating base, the upper mounting member and the vibration isolating base are transported in a temporarily fixed state to perform the assembling work. Therefore, there is an effect that the transport workability and the assembly workability can be improved.

According to the vibration isolator of claim 5, since the protruding portion includes the injection trace portion connected to the injection hole when the vibration isolating base is vulcanized by the vulcanization mold, the vibration isolator is provided. During use, it is possible to prevent the vibration-proof substrate from being cracked. That is, the anti-vibration base is a member that is elastically deformed when the vibration isolator is used, and the root portion of the injection trace portion is particularly prone to stress concentration during use of the anti-vibration device, and the portion where cracks are likely to occur due to this. It is. However, when the vibration isolator is used, the stress acting on the protruding portion protruding upward from the upper end portion of the vibration isolating base is small. Therefore, by forming the injection trace portion on the low protruding portion of the stress, Can prevent cracks at the roots. As a result, in addition to the effect of the fourth aspect, there is an effect that it is possible to prevent the vibration-proof substrate from being cracked and the durability from being lowered.

According to the vibration isolator of the sixth aspect, the vibration isolating base has the lower extending portion extending downward from the lower end portion, and the lateral extending portion extending from the lower extending portion outward in the horizontal direction. The lower mounting member is inserted into the lower through hole formed in the lower mounting member, and the lateral extending portion is positioned outside the lower through hole, so that the lower mounting member is supported by the vibration isolation base and temporarily fixed. it can. The lower mounting member and the vibration isolating base are not bonded, but when the lower mounting member and the vibration isolating base are assembled, the lower mounting member and the vibration isolating base are transported in a temporarily fixed state for assembly work. In addition to the effect of any one of claims 1 to 5, there is an effect that the transport workability and the assembly workability can be improved.

It is a perspective view of the vibration isolator in 1st Embodiment. It is a front view of a vibration isolator. It is a side view of a vibration isolator. It is a top view of a vibration isolator. FIG. 5 is a cross-sectional view of the vibration isolator taken along line VV in FIG. 4. FIG. 5 is a cross-sectional view of the vibration isolator taken along line VI-VI in FIG. 4. It is a front view of a vibration isolator base. It is a side view of an anti-vibration base | substrate. It is a top view of a vibration proof base. FIG. 10 is a cross-sectional view of the vibration-proof base taken along line XX in FIG. 9. It is sectional drawing of the vibration isolator which shows the assembled | attached state. It is a fragmentary sectional view of the vibration isolator in the Example where the bound load was loaded. It is a fragmentary sectional view of the vibration isolator in the comparative example where the bound load was loaded. It is a perspective view of the vibration isolator in 2nd Embodiment. It is a front view of a vibration isolator. It is a side view of a vibration isolator. It is a top view of a vibration isolator. It is sectional drawing of the vibration isolator in the XVIII-XVIII line | wire of FIG. Perspective view of anti-vibration substrate It is a front view of a vibration isolator base. It is a side view of an anti-vibration base | substrate. It is a top view of a vibration proof base. FIG. 23 is a cross-sectional view of the vibration-proof base taken along line XXIII-XXIII in FIG. It is a perspective view of the vibration isolator in 3rd Embodiment. It is a front view of a vibration isolator. It is a side view of a vibration isolator. It is a top view of a vibration isolator. It is sectional drawing of the vibration isolator in the XXVIII-XXVIII line | wire of FIG. It is a perspective view of a vibration isolator base. It is a front view of a vibration isolator base. It is a side view of an anti-vibration base | substrate. It is a top view of a vibration proof base. FIG. 33 is a cross-sectional view of the vibration-proof base taken along line XXXIII-XXXIII in FIG. 32. It is a perspective view of the vibration isolator base used for the vibration isolator in a comparative example. It is a top view of the vibration proof base in a comparative example. FIG. 36 is a cross-sectional view of the vibration-proof base taken along line XXXVI-XXXVI in FIG. 35.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. First, the vibration isolator 1 according to the first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view of a vibration isolator 1 according to the first embodiment. In addition, the arrow U, arrow D, arrow L, arrow R, arrow F, and arrow B illustrated in FIG. 1 indicate the direction of the vehicle body (not shown) to which the vibration isolator 1 is attached, and the arrow U is the vehicle body. The arrow D indicates the downward direction of the vehicle body, the arrow L indicates the left direction of the vehicle body, the arrow R indicates the right direction of the vehicle body, the arrow F indicates the forward direction of the vehicle body, and the arrow B indicates the backward direction of the vehicle body. Show. Further, the arrow U, arrow D, arrow L, arrow R, arrow F, and arrow B shown in FIG. 2 and subsequent figures are the directions indicated by the arrow U, arrow D, arrow L, arrow R, arrow F, and arrow B shown in FIG. Corresponding to

The vibration isolator 1 is one of the vibration isolators that support a power plant PP such as an engine (see FIG. 11) at three points (supported at two left and right points and one rear point). The vibration isolator 1 is interposed between the left side of the power plant PP and the vehicle body frame BF (see FIG. 11), and is configured as a mount that elastically supports the power plant PP on the vehicle body frame BF. As shown in FIG. 1, the vibration isolator 1 includes an upper attachment member 10 attached to the power plant PP side, a lower attachment member 20 attached to the vehicle body frame BF side, an upper attachment member 10, and a lower attachment member 20. And an anti-vibration base 30 interposed therebetween. The upper mounting member 10 and the lower mounting member 20 are high-rigidity plates formed of a metal material such as an aluminum alloy, and the vibration isolation base 30 is made of a rubber-like elastic material.

As shown in FIG. 1, the upper mounting member 10 is a member formed of a substantially rectangular plate material that is long in the front-rear direction and short in the left-right direction in plan view, and includes a substantially rectangular mounting plate portion 11 and a mounting plate. The upper restricting portion 12 that is coupled to the periphery of the portion 11 and is inclined upward as it goes outward, the flat upper surface portion 13 that is coupled to the periphery of the upper restricting portion 12 and extends in the horizontal direction, and the periphery of the upper surface portion 13. The upper receiving part 14 which is formed and inclines downward as it goes outward is provided, and a flat upper projecting plate part 15 which is continuous with the front and rear of the upper receiving part 14 and extends in the front-rear direction. The mounting plate portion 11 is a portion to which a bracket BR (see FIG. 11) connected to the power plant PP is fixed, and a hole portion 11a through which a shaft-like member B such as a bolt is inserted is formed substantially through the center. Yes.

The lower mounting member 20 includes a lower wall portion 21 formed in a substantially rectangular cylindrical shape in plan view, an upper wall portion 24 positioned outside the lower wall portion 21 above the lower wall portion 21, and an upper wall. And a flat under-extension plate portion 26 which is formed around the upper end of the portion 24 and extends in the front-rear direction and extends in the left-right direction. The front lower projecting plate portion 26a and the rear lower projecting plate portion 26c extending in the front-rear direction are portions fixed to the vehicle body frame BF (see FIG. 11), and a shaft-like member (not shown) such as a bolt is inserted therethrough. A hole 26e is formed through.

The anti-vibration base 30 is a substantially rectangular member in plan view that is interposed between the upper mounting member 10 and the lower mounting member 20 in a non-adhesive manner, and includes a lower projecting plate portion 26 and an upper projecting plate portion. 15 and is provided with an overhang 33 for buffering the impact of the bound load. The anti-vibration base 30 is not bonded to the upper attachment member 10 and the lower attachment member 20, but as will be described later, the upper side is provided by the protruding portions 36 and the laterally extending portions 37a provided above and below the anti-vibration base 30. Locked to the mounting member 10 and the lower mounting member 20.

2 is a front view of the vibration isolator 1, FIG. 3 is a side view of the vibration isolator 1, and FIG. 4 is a plan view of the vibration isolator 1. As shown in FIGS. 2 and 3, the lower wall portion 21 of the lower attachment member 20 includes a front lower wall portion 21 a that is formed in a horizontally long substantially rectangular shape when viewed from the front, and a predetermined distance from the front lower wall portion 21 a. The rear lower wall portion 21c, the rear lower wall portion 21c and the front lower wall portion 21a, which are opposed to each other with a gap between them, are formed in a horizontally long rectangular shape when viewed from the side, and the rear lower wall portion 21c. And a lower right wall portion 21d that is coupled to the front lower wall portion 21a and is opposed to the lower left wall portion 21b at a predetermined interval. A bottom portion 23 projects horizontally from the periphery of the upper end of the lower wall portion 21, and an upper wall portion 24 is erected in the vertical direction on the bottom portion 23.

The upper wall portion 24 includes a front upper wall portion 24a that is formed in a horizontally long substantially rectangular shape when viewed from the front, a rear upper wall portion 24c that faces the front upper wall portion 24a at a predetermined interval, and a rear upper wall portion. 24c and the front upper wall part 24a are coupled with the left upper wall part 24b formed in a laterally long rectangular shape when viewed from the side, and the upper left wall part 24b is coupled with the rear upper wall part 24c and the front upper wall part 24a. And an upper right wall 24d facing each other with a predetermined interval. The height of the upper wall portion 24 in the vertical direction (arrow UD direction) is set to a value larger than the height of the lower wall portion 21 in the vertical direction.

The lower projecting plate portion 26 includes a front lower projecting plate portion 26a and a rear lower projecting plate portion 26c extending in the front-rear direction, a left lower projecting plate portion 26b and a right lower projecting plate portion 26d extending in the left-right direction, Are coupled around the upper wall 24. The extension length of the front lower extension plate portion 26a and the rear lower extension plate portion 26c with respect to the upper wall portion 24 is the extension length of the left lower extension plate portion 26b and the right lower extension plate portion 26d with respect to the upper wall portion 24. It is set to a value larger than. The width in the left-right direction (arrow RL direction) of the left lower projecting plate portion 26b and the right lower projecting plate portion 26d is set to a value slightly larger than the width in the left / right direction of the upper mounting member 10, and The length in the front-rear direction (arrow FB direction) of the plate portion 26a and the rear lower projecting plate portion 26c is set to a value larger than the length in the front-rear direction of the upper projecting plate portion 15 of the upper mounting member 10. .

The lower inclined portion 25 is a portion that is coupled to the upper wall portion 24 and the lower projecting plate portion 26, and the front lower inclined portion 25a that is coupled to the front upper wall portion 24a and the front lower projecting plate portion 26a. A rear lower wall portion 24c and a rear lower inclined portion 25c coupled to the rear lower projecting plate portion 26c. The front lower inclined portion 25a is inclined upward as it goes upward, and the rear lower inclined portion 25c is inclined upward as it goes upward.

The anti-vibration base 30 is a lump-like member interposed between the upper mounting member 10 and the lower mounting member 20 in a non-adhesive manner, and the upper mounting member 10 and the lower mounting member 20 are spaced apart by the connecting portion 34. The upper overhanging plate portion 15 and the lower overhanging plate portion 26 function as a bound stopper. As shown in FIG. 2, a left overhang 33b is located between the upper mounting member 10 and the left lower overhanging plate portion 26b, and a right overhang between the upper mounting member 10 and the lower right overhanging plate 26d. The part 33d is located. Further, as shown in FIG. 4, the front overhanging portion 33a is located between the upper overhanging plate portion 15 and the front underhanging plate portion 26a, and the upper overhanging plate portion 15 and the rear underhanging plate portion 26c. The rear overhang part 33c is located between the two. The front projecting portion 33a, the left projecting portion 33b, the rear projecting portion 33c, and the right projecting portion 33d can cushion an impact when the upper mounting member 10 and the lower mounting member 20 collide with each other due to a bound load.

5 is a cross-sectional view of the vibration isolator 1 along the line VV in FIG. 4, and FIG. 6 is a cross-sectional view of the vibration isolator 1 along the line VI-VI in FIG. As shown in FIG. 5, the anti-vibration base 30 is configured to include a lower end portion 31 and an upper end portion 35 and a connecting portion 34 that connects them, and has a substantially square cylindrical inner peripheral surface. A communication hole 30a that communicates the upper end portion 35 in the vertical direction is formed substantially at the center. The upper end portion 35 of the vibration isolation base 30 abuts on the upper mounting member 10, and the lower end portion 31 abuts on the lower mounting member 20.

The upper restricting portion 12 of the upper mounting member 10 rises and slopes toward the outer side and is coupled to the upper surface portion 13, and the upper receiving portion 14 coupled to the periphery of the upper surface portion 13 descends and tilts toward the outer side. Accordingly, when a compression load is applied to the vibration isolation base 30 via the upper mounting member 10, the upper end portion 35 of the vibration isolation base 30 is restrained by the upper restriction portion 12 and the upper receiving portion 14 in the left-right direction, and the vertical direction is Restrained by the upper surface portion 13. As a result, it is possible to prevent the position of the upper end portion 35 of the anti-vibration base 30 from shifting, so that a compressive load can be applied to the anti-vibration base 30 via the upper mounting member 10.

The bottom 23 of the lower mounting member 20 is a part that restrains the lower end 31 of the vibration isolating base 30 in the vertical direction. The bottom part 23 is extended in the direction which cross | intersects the lower wall part 21 in which the lower through-hole 20a is formed. Specifically, the left bottom part 23b and the right bottom part 23d extend obliquely upward and outward with respect to the left lower wall part 21b and the right lower wall part 21d, and the front bottom part 23a and the rear bottom part 23c The wall portion 21a and the rear lower wall portion 21c are extended outward in the horizontal direction. Since the bottom 23 extends in a direction intersecting the lower wall portion 21 in this way, when a vertical compressive load is input to the vibration isolation base 30, the lower end 31 of the vibration isolation base 30 is located on the lower side. It is possible to prevent the attachment member 20 from being detached downward.

As shown in FIGS. 5 and 6, the front bottom portion 23a and the rear bottom portion 23c of the lower mounting member 20 are set to have a larger horizontal length than the left bottom portion 23b and the right bottom portion 23d. The upper left wall portion 24b and the upper right wall portion 24d are formed as flat surfaces along the vertical direction, whereas the front upper wall portion 24a and the rear upper wall portion 24c are front lower inclined portions that extend outward (front and rear direction). 25a and rear lower inclined part 25c are coupled. In addition, the bottom part 23, the upper wall part 24, and the lower inclination part 25 comprise the extension part 22 extended toward the direction which cross | intersects an up-down direction from the circumference | surroundings of the lower through-hole 20a.

The front lower slope part 25a and the rear lower slope part 25c are parts for receiving the front extension part 32a and the rear extension part 32c of the vibration isolation base 30. The front connection part 34a of the vibration isolating base 30 is a part for connecting the front extension part 32a, the front lower end part 31a, and the front upper end part 35a, and the rear connection part 34c includes the rear extension part 32c and the rear lower end part 31c. And a rear upper end portion 35c. Since the front lower inclined portion 25a and the rear lower inclined portion 25c are provided, the extending portion 22 can be enlarged. As a result, the horizontal thickness of the front connecting portion 34a and the rear connecting portion 34c of the vibration isolation base 30 can be set larger than the horizontal thickness of the left connecting portion 34b and the right connecting portion 34d. Since the volume of the anti-vibration base 30 in the front-rear direction (arrow FB direction) can be larger than the volume of the anti-vibration base 30 in the left-right direction (arrow LR direction), the front-rear direction (arrow F- The spring constant in the B direction can be set larger than the spring constant in the left and right direction (arrow LR direction).

Further, the left connecting part 34b and the right connecting part 34d are formed with recessed parts 34b1 and 34d1 along the front-rear direction on the outer surface of the approximate center in the vertical direction of the left connecting part 34b and the right connecting part 34d. Since the left connecting portion 34b and the right connecting portion 34d can be partially thinned by the recessed portions 34b1 and 34d1, the left connecting portion 34b and the right connecting portion 34d can be easily deformed, and the spring constant in the left-right direction is further increased. Can be reduced.

The vibration isolator base 30 has

recesses

38 and 39 formed on the inner peripheral surface of the communication hole 30a. The concave portion 38 is formed at a horizontal position of the lower projecting plate portion 26 of the lower mounting member 20, and a concave portion 39 is formed above the concave portion 38 with a predetermined distance from the concave portion 38. The

recesses

38 and 39 are recessed in a direction intersecting with the up and down direction, and are arranged side by side with a gap at a position corresponding to the recesses 34b1 and 34d1. Each of the

recesses

38 and 39 is formed in an annular shape over the circumferential direction of the communication hole 30a, and each axial cross section is formed in an arc shape. Since the

concave portions

38 and 39 are formed between the lower end portion 31 and the upper end portion 35, when the compression load is applied to the vibration isolation base 30, the vibration isolation base 30 is deformed so as to expand outside the insertion hole 30a. To do.

Here, when the

recesses

38 and 39 are not formed on the inner peripheral surface of the communication hole 30 a of the vibration isolation base 30, when the vibration isolation base 30 is deformed in the vertical direction, the bottom formed on the lower mounting member 20. It becomes easy to drop off from the through hole 20a. When the vibration isolating base 30 is detached from the lower mounting member 20 and the lower mounting member 20 is separated from the vibration isolating base 30, the vibration isolating performance may be lowered or abnormal noise may be generated accordingly.

On the other hand, according to the vibration isolator 1, the deformed vibration isolating base 30 is pressed against the bottom 23, the upper wall 24, and the lower inclined part 25 of the lower mounting member 20, so that the vibration isolating base loaded with a compressive load is applied. 30 is prevented from detaching downward from the bottom 23 and the lower inclined portion 25. As a result, the vibration isolation base 30 can be prevented from being separated from the lower mounting member 20.

In addition, since the

recesses

38 and 39 are formed in an arc shape in the axial direction, it is possible to suppress the concentration of compressive stress in the

recesses

38 and 39. As a result, it is possible to suppress the deterioration of the vibration isolation base 30 due to the

recesses

38 and 39. Further, since the

recesses

38 and 39 are arranged side by side with a gap at positions corresponding to the recesses 34b1 and 34d1, the

recesses

38 and 39 facilitate the deformation of the vibration-proof base 30 and the

recesses

38 and 39. Therefore, it is possible to suppress the vibration-proof substrate 30 from becoming excessively thin. As a result, it is possible to prevent the spring constant in the left-right direction (arrow RL direction) of the vibration-isolating base 1 from becoming extremely small.

The communication hole 30a is formed such that the inner diameter in the left-right direction (the width in the direction of the arrow RL in FIG. 5) gradually increases from the bottom toward the recess 38. This makes it possible to reduce the thickness of the vibration isolation base 30 in the left-right direction (arrow RL direction in FIG. 5), and to set the spring constant in the left-right direction (arrow LR direction) in the front-rear direction (arrow F--). It can be set smaller than the spring constant in the B direction).

As shown in FIG. 5, the upper restricting portion 12 of the upper attachment member 10 is provided to the left bottom portion 23b and the right bottom portion 23d of the lower attachment member 20, and communicates with the left bottom portion 23b and the right bottom portion 23d. It is located near the center of 30a. As a result, the left connecting portion 34b and the right connecting portion 34d of the anti-vibration base 30 interposed between the lower mounting member 20 and the upper mounting member 10 are connected to the upper restricting portion 12, the left bottom portion 23b, and the right bottom portion 23d. A compressive load in the vertical direction can be reliably applied. This is because, when a compressive load is applied to the vibration isolating base 30, the vibration isolating base 30 is deformed so as to expand to the outside of the insertion hole 30 a by the

recesses

38 and 39 formed in the vibration isolating base 30. The upper restricting portion 12 is opposed to the left bottom portion 23b and the right bottom portion 23d of the lower mounting member 20, and the upper restricting portion 12 is positioned closer to the center of the communication hole 30a with respect to the left bottom portion 23b and the right bottom portion 23d. by.

As shown in FIG. 6, the upper restricting portion 12 of the upper mounting member 10 is provided opposite to the front bottom portion 23a and the rear bottom portion 23c of the lower mounting member 20, and communicates with the front bottom portion 23a and the rear bottom portion 23c. It is located near the center of 30a. As a result, the front connecting portion 34a and the rear connecting portion 34c of the vibration isolating base 30 interposed between the lower mounting member 20 and the upper mounting member 10 are connected to the upper regulating portion 12, the front bottom portion 23a, and the rear bottom portion 23c. A compressive load in the vertical direction can be reliably applied. This is because, when a compressive load is applied to the vibration isolating base 30, the vibration isolating base 30 is deformed so as to expand to the outside of the insertion hole 30 a by the

recesses

38 and 39 formed in the vibration isolating base 30. This is because the deformation of the vibration isolation base 30 is received by the front bottom portion 23a and the rear bottom portion 23c.

Further, the upper restricting portion 12 is inclined upward as it goes outward, and the front lower inclined portion 25a and the rear lower inclined portion 25c are inclined upward as it goes outward. Thereby, the vertical compressive load applied to the vibration isolating base 30 can be applied as a component force perpendicular to the inclined surfaces of the upper restricting portion 12, the front lower inclined portion 25a, and the rear lower inclined portion 25c. Since the upper restricting portion 12 is located closer to the center of the communication hole 30a with respect to the front lower inclined portion 25a and the rear lower inclined portion 25c, it is possible to suppress bending stress and shear stress from acting on the vibration isolating base 30 and High spring characteristics in the direction (arrow FR direction) can be secured.

The upper mounting member 10 has upper through-holes 13a penetrating in the plate thickness direction at two positions before and after the upper surface portion 13. On the other hand, the anti-vibration base 30 is provided with a protruding portion 36 that protrudes upward corresponding to the position of the upper through hole 13a at the front upper end portion 35a and the rear upper end portion 35c. The protruding portion 36 is formed slightly narrower than the inner diameter of the upper through hole 13 a and is set to a length larger than the thickness of the upper surface portion 13. A locking portion 36 a formed larger in diameter than the hole diameter of the upper through hole 13 a protrudes from the front end side of the protruding portion 36 to the outer periphery of the protruding portion 36. Since the locking portion 36a gradually increases in diameter from the upper side toward the lower side, the protruding portion 36 protruding from the vibration isolation base 30 and the locking portion are formed in the upper through hole 13a formed in the upper mounting member 10. The part 36a can be inserted. The anti-vibration base 30 is not bonded to the upper mounting member 10, but after the protruding portion 36 and the locking portion 36a are inserted into the upper through hole 13a, the upper mounting member 10 is attached to the anti-vibration base 30 by the locking portion 36a. Can be fixed.

The anti-vibration base 30 has a lower extending portion 37 extending downward from the lower end portion 31, and a laterally extending portion 37 a extending from the tip of the entire circumference of the lower extending portion 37 toward the outside in the horizontal direction. ing. The lower extending portion 37 is set to a value whose vertical length is larger than the vertical length of the lower wall portion 21, and the laterally extending portion 37 a has a distal end located outside the lower wall portion 21 of the lower mounting member 20. Is set to Thereby, the lower extension part 37 and the lateral extension part 37a of the vibration isolator base 30 can be elastically deformed and inserted into the lower through hole 20a of the lower attachment member 20. The anti-vibration base 30 is not bonded to the lower mounting member 20, but after the lower extension 37 and the lateral extension 37a are inserted into the lower through hole 20a, the horizontal extension 37a is attached to the anti-vibration base 30. The lower mounting member 20 can be fixed. Since the lower end of the laterally extending portion 37a is chamfered, the lower attachment member 20 can be easily inserted into the lower through hole 20a. By fixing the upper mounting member 10 and the lower mounting member 20 to the vibration isolating base 30, it is possible to improve the transportability until the vibration isolator 1 is mounted on the vehicle body frame BF and the mounting workability when mounting.

Next, the anti-vibration base 30 will be described with reference to FIGS. 7 is a front view of the vibration isolating base 30, FIG. 8 is a side view of the vibration isolating base 30, FIG. 9 is a plan view of the vibration isolating base 30, and FIG. 10 is taken along line XX in FIG. It is sectional drawing of a vibration proof base. Since the vibration-proof base 30 is interposed between the upper connecting member 10 and the lower connecting member 20 without being bonded, the anti-vibration base 30 is vulcanized and formed as a separate member from the upper connecting member 10 and the lower connecting member 20.

As shown in FIGS. 7 and 8, the front lower extension part 32a and the rear lower extension part 32c of the vibration isolating base 30 are not provided on the entire front upper wall part 31a and rear upper wall part 31c. It is provided in the center part of the left-right direction of the front upper wall part 31a and the rear upper wall part 31c. Thereby, the influence of the front lower extension part 32a and the rear lower extension part 32c can hardly appear in the spring constant of the vibration isolator 1 in the left-right direction (arrow RL direction). As a result, the ratio between the spring constant in the front-rear direction (arrow FB direction) and the spring constant in the left-right direction (arrow RL direction) can be increased.

As shown in FIG. 9, the insertion hole 30 a has a substantially rectangular inner peripheral surface in plan view, and is formed so as to penetrate the vibration-proof base 30 in the vertical direction. An injection trace portion 36b is formed on the protruding portion 36 projecting from the front upper end portion 35a and the rear upper end portion 35c of the vibration isolating base 30. The injection trace portion 36b is connected to a rubber-like elastic material injection hole (not shown) formed in the vulcanization mold when the vibration-proof base 30 is vulcanized by a vulcanization mold (not shown). It is the part which was done. Thereby, when using the vibration isolator 1, it is possible to prevent the vibration isolator base 30 from being cracked.

That is, the anti-vibration base 30 is a member that is elastically deformed when the anti-vibration device 1 is used, and the root portion of the injection trace portion is particularly prone to stress concentration when the anti-vibration device 1 is used, resulting in cracks. It is a place that is easy to do. On the other hand, since the stress acting on the protruding portion 36 protruding upward from the upper end portion 35 of the vibration isolating base 30 is small, by forming the injection trace portion 36b on the protruding portion 36, the root of the injection trace portion 36b is formed. It is difficult to cause cracks. As a result, it is possible to prevent the vibration-proof substrate 30 from cracking and lowering the durability.

As shown in FIG. 10, the protruding portion 36 protrudes from the rear upper end portion 35c (and the front upper end portion 35a) that is thicker and larger in volume than the upper right end portion 35d. The protruding portion 36 is a part for fixing the upper mounting member 10 to the vibration isolating base 30 in order to improve the transportability and assembling properties until the vibration isolating base 1 is attached to the vehicle body frame BF and the power plant PP. It is. By providing the protruding portions 36 at the rear upper end portion 35c and the front upper end portion 35a, the anti-vibration base body 1 is provided with the vehicle body frame BF and the case where the protruding portions 36 are provided at the upper left end portion 35b and the upper right end portion 35d. It is possible to suppress the protruding portion 36 from being broken and the vibration-proof base 30 and the upper mounting member 20 from being separated at the time of transportation before being mounted on the power plant PP.

Further, since the vibration isolator base 30 is not bonded to the upper mounting member 10 and the lower mounting member 20, it is not attached to the upper mounting member 10 and the lower mounting member 20 by vulcanization, but is attached to the upper mounting member 10 and the lower mounting member 20. Vulcanization molding is performed separately from the member 10 and the lower mounting member 20. Accordingly, the degree of freedom in designing a vulcanization mold for vulcanizing and molding the vibration-proof substrate 30 can be improved, and the

recesses

38 and 39 that can be undercut can be easily formed in the insertion hole 30a.

Next, a method of using the vibration isolator 1 will be described with reference to FIG. FIG. 11 is a cross-sectional view of the vibration isolator 1 showing a state assembled to the vehicle body frame BF and the power plant PP. As shown in FIG. 11, the vibration isolator 1 is fixed to the vehicle body frame BF by bolts (not shown) inserted through the holes 26e of the front projecting plate portion 26a and the rear projecting plate portion 26c. A bracket BR is fixed to the upper end side of the power plant PP. The bracket BR is a member formed in a substantially cross shape when viewed from the side, and protrudes above the power plant PP. The bracket BR is inserted into the insertion hole 30a of the vibration isolator 1 from below. A shaft-like member B such as a bolt is inserted into a hole 11a formed in the mounting plate portion 11, and is screwed to the bracket BR.

When the shaft-like member B is screwed to the bracket BR positioned in the insertion hole 30a and the upper end side of the shaft-like member B is fixed to the hole portion 11a, the power plant PP is passed through the vibration isolator 1 and the bracket BR. The power plant PP is elastically supported by the vibration isolation base 30 in a state of being suspended from the vehicle body frame BF. As shown in FIG. 11, the vibration isolating base 30 is compressed in the vertical direction by the weight of the power plant PP. Since the anti-vibration base 30 has

recesses

38 and 39 formed on the inner peripheral surface of the insertion hole 30a over the entire circumference, the anti-vibration base 30 compressed up and down extends outward with respect to the insertion hole 30a. Transforms into Thereby, since the vibration isolator base 30 is pressed by the extension part 22 (the bottom part 23, the lower wall part 24, and the lower inclination part 25) of the lower side attachment member 20, it can suppress falling off from the insertion hole 30a downward. .

When the anti-vibration device 1 is attached as described above, when a bound load is input to the anti-vibration device 1, the upper overhanging plate portion 15 and the lower overhanging plate portion 26 (the front overhanging plate portion 26a, etc.) ) Exhibits a function as a bound stopper, and the overhang portion 33 (the front overhang portion 33a and the like) cushions the impact. Further, when a rebound load is input to the vibration isolator 1, the overhanging plate portion BR1 and the bottom portion 23 (the rear bottom portion 23c, etc.) or the lower wall portion 21 (the rear lower wall portion 21c, etc.) of the bracket BR projecting back and forth. ) Will function as a rebound stopper.

Note that the vertical length of the bracket BR located in the insertion hole 30 a is set to be shorter than the natural length of the vibration isolation base 30. The vertical length of the bracket BR is such that the anti-vibration base 30 is not separated from the lower mounting member 20 when a rebound load is applied and the anti-vibration base 30 is restricted by the rebound stopper while extending (restoring) upward. Is set to a large size. Thereby, generation | occurrence | production of the unusual noise resulting from a friction and a pressure change between the lower side attachment member 20 and the anti-vibration base | substrate 30 can be suppressed.

Further, the upper restricting portion 12 of the upper attachment member 10 is provided opposite to the front bottom portion 23a and the rear bottom portion 23c of the lower attachment member 20, and is closer to the center of the communication hole 30a with respect to the front bottom portion 23a and the rear bottom portion 23c. Since it is located, the compression load of an up-down direction can be reliably loaded to the front connection part 34a and the rear connection part 34c. Further, since the front lower inclined portion 25a and the rear lower inclined portion 25c are coupled to the front bottom portion 23a and the rear bottom portion 23c, respectively, it is possible to prevent the position of the antivibration base 30 from being displaced, and the front connecting portion 34a and the rear lower portion 23c. The volume of the connecting portion 34c can be increased. As a result, the spring constant in the front-rear direction can be ensured.

Next, with reference to FIGS. 12, 13, and 34 to 36, the operation of the vibration isolator 1 when a bound load is applied will be described in comparison with a comparative example. First, with reference to FIGS. 34 to 36, a vibration isolator according to a comparative example will be described. In addition, about the part same as what was demonstrated in 1st Embodiment, the same code | symbol is attached | subjected and the following description is abbreviate | omitted. 34 is a perspective view of a vibration isolating base 930 used in the vibration isolating apparatus in the comparative example, FIG. 35 is a plan view of the vibration isolating base 930 in the comparative example, and FIG. 6 is a cross-sectional view of a vibrating base 930. FIG. The vibration isolator in the comparative example is mounted on the upper mounting member 10 and the lower mounting member 20 in place of the vibration isolating base 30 of the vibration isolating apparatus 1 described in the first embodiment. The vibration isolator in the example is the vibration isolator 1 in the first embodiment.

As shown in FIG. 34 and FIG. 35, the anti-vibration base 930 includes a connecting portion 934 that is formed in a truncated quadrangular pyramid shape in a plan view and has a substantially rectangular insertion hole 930a in a plan view. A through-hole is formed in the vertical direction. As shown in FIG. 36, the connecting portion 934 has different thicknesses in the front-rear direction and the left-right direction, and the rear connecting portion 934c (and the front connecting portion 934a) is thicker than the right connecting portion 934d (and the left connecting portion 934b). The thickness is set large. The

concave portions

38 and 39 described in the first embodiment are not formed in the connecting portion 934, and the inner peripheral surface of the communication hole 930a of the connecting portion 934 is formed flat. Further, the recessed portions 34b1 and 34d1 are not formed in the vibration isolating base 930, and the surface of the connecting portion 934 is formed flat.

It is assumed that the vibration isolator 1 in the embodiment and the vibration isolator in the comparative example are attached to the vehicle body frame BF and the power plant PP is fixed, and the vibration isolator base 30 when the same bounding load is applied. The behavior was simulated using a computer.

FIG. 12 is a partial cross-sectional view of the vibration isolator 1 in the embodiment in which the bound load is applied, and FIG. 13 is a partial cross-sectional view of the vibration isolator in the comparative example in which the bounce load is applied. Both are the results of simulation. In FIG. 12 and FIG. 13, a quarter cut model is shown and the bracket BR is not shown for easy understanding.

In the vibration isolator 1 in the embodiment shown in FIG. 12, the vibration isolating base 30 is in close contact with the front bottom 23a and the right bottom 23d, and the vibration isolating base 30 is compressed vertically between the upper mounting member 10 and the lower mounting member 20. It has been transformed. The upper receiving portion 15 is not in contact with the front projecting portion 33a, and the front connecting portion 34a and the right connecting portion 34d receive the bound load.

On the other hand, in the vibration isolator in the comparative example shown in FIG. 13, the gap between the upper mounting member 10 and the lower mounting member 20 is smaller than that in the vibration isolator 1 in the embodiment (see FIG. 12). From this, it can be seen that the anti-vibration base 930 is spaced apart from the lower mounting member 20 and lowered. In the comparative example, it is clear that the vibration-proof base 930 (front connecting portion 934a) does not sufficiently receive the bound load. This is because the

concave portions

38 and 39 are not formed in the vibration-proof base 930 in the comparative example. Since the

recesses

38 and 39 are not formed, it is presumed that the vibration-proof base 930 is hardly deformed to the outside and is separated from the lower mounting member 20.

Further, in the vibration isolator in the comparative example, a large gap is formed between the lower mounting member 20 and the right connecting portion 934d. This is because the right connecting portion 934d of the vibration isolating base 930 is greatly deformed inward so as to have a square shape and is displaced downward with respect to the lower mounting member 20. The inward deformation of the right connecting portion 934d is caused by the fact that the

concave portions

38 and 39 are not formed in the vibration-proof base 930. The downward displacement of the right connecting portion 934d with respect to the lower mounting member 20 is also due to the fact that the recessed portions 34b1 and 34d1 are not formed on the surface of the right connecting portion 934d.

As described above, the anti-vibration device in the comparative example does not have the

recesses

38 and 39 formed in the anti-vibration base 930. Therefore, the anti-vibration base 930 is hardly deformed to the outside, and the anti-vibration base 930 is attached to the lower mounting member 20. On the other hand, it is displaced downward or is deformed inward to be separated from the lower mounting member 20. If the vibration isolation base 930 is separated from the lower mounting member 20, the vibration isolation performance may be deteriorated or abnormal noise may be generated. On the other hand, according to the vibration isolator 1 in the embodiment, since the

recesses

38 and 39 are formed on the inner peripheral surface of the insertion hole 30a of the vibration isolator base 30, the vibration isolator base 30 can be easily deformed outward. Moreover, since the recessed portions 34b1 and 34d1 are formed on the surface of the right connecting portion 934d, the right connecting portion 934d can be easily bent, and the downward displacement of the right connecting portion 934d can be suppressed. As a result, it is possible to make it difficult to separate the vibration isolation base 30 from the lower mounting member 20, to ensure the vibration isolation performance of the vibration isolation device 1 and to prevent the generation of abnormal noise. By securing the anti-vibration performance of the vibration isolator 1, the spring constant in the front-rear direction can be set larger than the spring constant in the left-right direction while ensuring the spring constant in the vertical direction.

Next, a second embodiment will be described with reference to FIGS. In the first embodiment, the left and right spring constants are formed thinner than the front and rear connecting

parts

34b and 34c of the anti-vibration base 30 by changing the left and right spring constants. The case of setting a smaller value has been described. On the other hand, in the second embodiment, a case will be described in which the

spring constants

134b and 134d are formed on the vibration isolation base 130 so that the spring constant in the left-right direction is set to a value smaller than the spring constant in the front-rear direction. In addition, about the part same as 1st Embodiment, the same code | symbol is attached | subjected and the following description is abbreviate | omitted.

FIG. 14 is a perspective view of the vibration isolator 101 according to the second embodiment, FIG. 15 is a front view of the vibration isolator 101, FIG. 16 is a side view of the vibration isolator 101, and FIG. 18 is a plan view of the device 101, and FIG. 18 is a cross-sectional view of the vibration isolator 101 taken along line XVIII-XVIII in FIG. The vibration isolator 101 is interposed between the upper attachment member 110 attached to the power plant PP side, the lower attachment member 20 attached to the vehicle body frame BF side, and the upper attachment member 110 and the lower attachment member 20. The anti-vibration base 130 is provided.

As shown in FIG. 14, the upper mounting member 110 is a member formed of a substantially rectangular plate material that is long in the front-rear direction and short in the left-right direction in plan view, and is formed in a substantially rectangular recess shape in plan view. Mounting plate portion 111, upper restricting portion 112 that is coupled to the periphery of mounting plate portion 111 and rises and tilts in the front-rear direction (arrow FB direction), and is coupled to the front-rear direction of upper restricting portion 112 to be horizontal. A flat upper surface portion 113 extending in the direction, an upper receiving portion 114 coupled to the upper surface portion 113 and inclined downward as it extends in the front-rear direction, and a flat shape coupled to the front and rear of the upper receiving portion 114 and extending in the front-rear direction. And an overhanging plate portion 115. The mounting plate 111 has a hole 111a through which a shaft-like member B such as a bolt is inserted at substantially the center. The anti-vibration base 130 is a member that is interposed between the upper mounting member 110 and the lower mounting member 20 in a non-adhesive manner, and includes an overhang portion 133 that cushions the impact of the bound load.

As shown in FIG. 15, the upper overhanging plate portion 115 is formed with a width smaller than the width in the left-right direction of the lower overhanging plate portion 26 in a front view. The width of the overhang portion 133 is set to a value smaller than the width of the lower overhang plate portion 26, and the width of the upper overhang plate portion 115 is set to a width smaller than the width of the overhang portion 133 (FIG. 17). reference). Further, as shown in FIG. 16, the length of the lower overhanging plate portion 26 in the front-rear direction (arrow FB direction) is larger than the length of the upper overhanging plate portion 115 of the upper mounting member 110 in the front-rear direction. The overhang portion 133 is set and is located below the overhang plate portion 115. Further, the anti-vibration base 130 has left and right

straight portions

134b and 134d that are hollow with the front connecting portion 134a and the rear connecting portion 134c formed at a position between the upper mounting member 110 and the lower mounting member 20. ing.

As shown in FIG. 18, the vibration isolation base 130 includes a lower end portion 131 and an upper end portion 135 and a connecting portion 134 that connects the lower end portion 131 and the upper end portion 135, and has a substantially square cylindrical inner peripheral surface. A communication hole 130a that communicates the upper end portion 135 in the vertical direction is formed substantially at the center. An upper end portion 135 of the vibration isolation base 130 abuts on the upper mounting member 110, and a lower end portion 131 abuts on the lower mounting member 20.

The upper restricting portion 112 of the upper attachment member 110 rises and slopes in the front-rear direction and is coupled to the upper surface portion 113, and the upper receiving portion 114 coupled to the front and rear of the upper surface portion 113 descends and tilts in the front-rear direction. . Thus, when a compression load is applied to the vibration isolation base 130 via the upper mounting member 110, the upper end portion 135 of the vibration isolation base 130 is restrained by the upper restricting portion 112 and the upper receiving portion 114 in the left-right direction, and the vertical direction is Restrained by the upper surface portion 113. As a result, it is possible to prevent the position of the upper end portion 135 of the anti-vibration base 130 from being shifted, so that a compressive load can be applied to the anti-vibration base 130 via the upper mounting member 110. Moreover, since the front extension part 132c received by the rear lower inclined part 25c is coupled to the rear connection part 134c, the vibration isolation base 130 can increase the front-rear volume of the vibration isolation base 130, and The spring constant in the direction can be secured.

Further, the anti-vibration base 130 is located at the left and right positions of the front connecting portion 134a and the rear connecting portion 134c, and between the upper end portion 135 (upper right end portion 135d and the like) and the overhang portion 133 (right extension portion 133d and the like).

Straight portions

134b and 134d are formed at the position of. Since the

straight portions

134b and 134d are formed on the left and right sides of the anti-vibration base 130, the spring constant in the left-right direction can be reduced as compared with the spring constant in the front-rear direction.

The anti-vibration base 130 is below the

straight portions

134b and 134d on the inner peripheral surface of the communication hole 130a, and has a bottom 23 (rear bottom 23c, right bottom 23d, etc.) and an upper wall 24 (rear upper wall 24c, upper right). A concave portion 138 is formed in the horizontal position of the wall portion 24d and the like over the circumferential direction of the communication hole 130a. Since the recess 138 is formed, the anti-vibration base 130 is deformed so as to expand toward the upper wall portion 24 (the rear upper wall portion 24c, the upper right wall portion 24d, etc.) due to the load of the vertical compression load. As a result, as in the first embodiment, the vibration isolation base 130 is prevented from being separated from the lower mounting member 20.

The anti-vibration base 130 has a downwardly extending portion 137 extending downward from the lower end portion 131, and a laterally extending portion 137a extending from the tip of the entire circumference of the downwardly extending portion 137 toward the outside in the horizontal direction. ing. When the lower extension portion 137 and the lateral extension portion 137a of the vibration isolation base 130 are elastically deformed and inserted into the lower through-hole 20a of the lower attachment member 20, the lateral extension portion 137a becomes below the lower attachment member 20. The tip is located outside the wall portion 21. As a result, the lower attachment member 20 is fixed to the vibration isolation base 130 by the laterally extending portion 137a. In addition, since the groove part 137b by which the lower end part of the lower wall part 21 is inserted is formed over the circumferential direction, the horizontal extending part 137a can make it difficult to drop the lower attachment member 20 from the vibration-proof base 130.

19 is a perspective view of the vibration isolation base 130, FIG. 20 is a front view of the vibration isolation base 130, FIG. 21 is a side view of the vibration isolation base 130, and FIG. 22 is a plan view of the vibration isolation base 130. FIG. 23 is a cross-sectional view of the vibration isolator base 130 taken along the line XXIII-XXIII in FIG. The anti-vibration base 130 is vulcanized and formed as a separate member from the upper connecting member 110 and the lower connecting member 20, and is interposed between the upper connecting member 110 and the lower connecting member 20 without bonding.

As shown in FIG. 20 and FIG. 21, the

straight portions

134b and 134d are formed so that the left and right direction of the vibration-proof base 130 is hollow. Further, as shown in FIG. 22, the insertion hole 130 a has a substantially rectangular inner peripheral surface in plan view, and is formed through the vibration-proof base 130 in the vertical direction. As a result, the spring constant in the left-right direction (arrow RL direction) and the spring constant in the front-rear direction (arrow FB direction) of the vibration isolator 101 can be made different.

Further, since the vibration isolation base 130 is vulcanized and molded separately from the upper mounting member 110 and the lower mounting member 20, the degree of freedom in designing a vulcanizing mold for vulcanizing the vibration isolation base 130 is improved. Can be made. Therefore, as shown in FIG. 23, the concave portion 138 and the

straight portions

134b and 134d that can be undercut can be easily formed in the vibration-proof base 130.

The method of using the vibration isolator 101 in the second embodiment is the same as the method of using the vibration isolator 1 in the first embodiment, so the following description is omitted. According to the vibration isolator 101, as in the vibration isolator 1 in the first embodiment, the recess 138 is formed in the vibration isolator base 130, thereby preventing the vibration isolator base 130 from being detached from the lower mounting member 20. it can. Further, since the

straight portions

134b and 134d penetrating in the left-right direction of the vibration-proof base 130 are formed, the spring constant in the left-right direction can be set smaller than the spring constant in the front-rear direction.

Next, a third embodiment will be described with reference to FIGS. In the first embodiment and the second embodiment, the left connection portion 34b and the right connection portion 34d of the vibration isolation base 30 are formed thinner than the front connection portion 34a and the rear connection portion 34c, or the vibration isolation base 130 is formed. The case where the left and

right spring constants

134b and 134d are formed to set the left and right spring constant to a value smaller than the front and rear spring constant has been described. On the other hand, in the third embodiment, a case will be described in which the protrusions 240 are formed in the left-right direction of the vibration-proof base 230 so that the spring constant in the left-right direction is set to a value larger than the spring constant in the front-rear direction. In addition, about the part same as 1st Embodiment, the same code | symbol is attached | subjected and the following description is abbreviate | omitted.

24 is a perspective view of the vibration isolator 201 in the third embodiment, FIG. 25 is a front view of the vibration isolator 201, FIG. 26 is a side view of the vibration isolator 201, and FIG. 28 is a plan view of the device 201, and FIG. 28 is a cross-sectional view of the vibration isolator 201 along the line XXVIII-XXVIII in FIG. The vibration isolator 201 is interposed between the upper attachment member 210 attached to the power plant PP side, the lower attachment member 220 attached to the vehicle body frame BF side, and the upper attachment member 210 and the lower attachment member 220. The anti-vibration base 230 is provided.

As shown in FIG. 24, the upper mounting member 110 is a member formed of a substantially rectangular plate material that is long in the front-rear direction and short in the left-right direction in plan view, and is formed in a substantially rectangular recess shape in plan view. The mounting plate portion 211, the upper restricting portion 212 that is coupled to the periphery of the mounting plate portion 211 and that is inclined upward as it goes outward, and the flat upper surface portion that is coupled to the front and rear directions of the upper restricting portion 212 and extends in the horizontal direction. 213, an upper receiving portion 214 coupled to the upper surface portion 213 and inclined downward as it extends in the front-rear direction, and a flat upper projecting plate portion 215 coupled to the front and rear of the upper receiving portion 214 and extending in the front-rear direction. It has. The attachment plate portion 211 has a hole portion 211a through which a shaft-like member B such as a bolt is inserted at substantially the center.

The lower mounting member 220 includes a lower wall portion 221 (see FIG. 25) formed in a substantially rectangular cylindrical shape in plan view, and an upper wall portion located above the lower wall portion 221 and outside the lower wall portion 221. 224 and a flat under-extension plate portion 226 that is coupled around the upper end of the upper wall portion 224 and extends in the front-rear direction and extends in the left-right direction. The underhang plate part 226 is a part fixed to the vehicle body frame BF (see FIG. 11). The anti-vibration base 230 is a member that is interposed between the upper mounting member 210 and the lower mounting member 220 in a non-adhesive manner, and includes an overhang portion 233 that cushions the impact of a bound load.

As shown in FIGS. 25 and 26, the lower mounting member 220 is protruded in the front-rear direction of the upper wall portion 224, is inclined upward, and is joined to the lower projecting plate portion 226. An inclined portion 225a and a rear lower inclined portion 225c) are provided. The upper mounting member 210 and the lower mounting member 220 are separated at an appropriate interval by the connecting portion 234 of the vibration isolation base 230. The connecting portion 234 has convex portions 240 (elastic ribs) formed in a ridge shape across the front and rear of the connecting portion 234 at a substantially intermediate position between the upper extending plate portion 215 and the lower extending plate portion 226. Is projected. The anti-vibration base 230 includes a laterally extending portion 237 a that extends below the lower wall portion 221 of the lower attachment member 220.

As shown in FIG. 28, the bottom part 223 (the rear bottom part 223c, the right bottom part 223d, etc.) of the lower mounting member 220 in which the lower through-hole 220a into which the vibration isolator 230 is inserted is formed is a lower wall part 221 (rear lower part). Wall 221c, lower right wall 221d, etc.). An upper wall portion 224 (rear upper wall portion 224c, upper right wall portion 224d, etc.) is erected at the tip of the bottom portion 223, and a lower extension plate portion 226 (rear lower extension plate portion 226c, right lower extension plate portion 226d, etc.). ) Are coupled to the upper wall portion 224. The lower inclined portion 225 (rear lower inclined portion 225c, lower right inclined portion 225d, etc.) is coupled to the upper wall portion 224.

The anti-vibration base 230 includes a lower end portion 231 (rear lower end portion 231c, right lower end portion 231d, etc.) and an upper end portion 235 (rear upper end portion 235c, upper right end portion 235d, etc.), and a connecting portion 234 (rear connecting portion) connecting them. 234c, right coupling part 234d, etc.). The anti-vibration base 230 has a communication hole 230a that communicates the lower end portion 231 and the upper end portion 235 in the vertical direction, and the communication hole 230a has a substantially rectangular inner peripheral surface in plan view. (See FIG. 32).

The vibration isolator base 230 has

recesses

238 and 239 formed in the circumferential direction of the inner peripheral surface of the communication hole 230a. The recess 238 has a substantially arc-shaped cross section in the vertical direction, and the bottom 223 (rear bottom 223c) of the lower mounting member 220 and the lower projecting plate portion in a state where no load is applied to the vibration isolator 201. 226 (rear underhanging plate portion 226c). The concave portion 239 is formed in a polygonal line with a vertical cross-section, and in a state where no load is applied to the vibration isolator 201, the mounting plate portion 211 of the upper mounting member 210 and the lower mounting member 220 are It is located between the bottom 223 (right bottom 223d).

The upper restricting portion 212 of the upper mounting member 210 rises and tilts in the left-right direction and the front-rear direction, and is opposed to the upper restricting portion 212 so as to face the lower right inclined portion 225d (and the lower left inclined portion) of the lower attaching member 220. ) Is provided. Since the upper restricting portion 212 is located closer to the center of the communication hole 230a with respect to the lower right inclined portion 225d, when the load is applied, the positional displacement of the right connecting portion 234d (and the left connecting portion) is suppressed, A compressive load can be applied to the right connecting portion 234d (and the left connecting portion).

Further, since the vibration isolating base 230 is formed with the

recesses

238 and 239, the vibration isolating base 230 is placed when a vertical compressive load is applied, as in the first and second embodiments. It is deformed to expand in the front-rear and left-right directions. Thereby, it is possible to prevent the vibration isolation base 230 from being separated from the lower attachment member 220.

Furthermore, since the anti-vibration base body 230 is provided with convex portions 240 (elastic ribs) that protrude in the left-right direction across the front-rear direction of the right connection portion 234d (and the left connection portion), the spring constant in the up-down direction is to some extent. The spring constant in the left-right direction can be set to a large value as compared with the spring constant in the vertical direction. In this case, the upper surface portion 213 of the upper mounting member 210 and the lower right overhanging plate portion 226d of the lower mounting member 220 serve as a bound stopper. Since the impact is buffered by the upper right end portion 235d and the right overhang portion 233d, the generation of abnormal noise can be suppressed. In addition, by setting the size (volume) of the convex portion 240, the thickness (volume) of the rear connecting portion 234c, and the like, the left and right spring constants where the convex portions 240 are formed are larger than the front and rear spring constants. It is possible to set it to a value.

The anti-vibration base 230 includes a lower extending portion 237 and a lateral extending portion 237a that extend downward along the lower wall portion 221 (the rear lower wall portion 221c, the right lower wall portion 221d, etc.) of the lower mounting member 220. It has. Since the tip of the laterally extending portion 237a is located outside the lower wall portion 221, the lower wall portion 221 is locked to the laterally extending portion 237a until the vibration isolator 201 is attached to the vehicle body frame BF. Meanwhile, the lower mounting member 220 can be held by the vibration isolation base 230.

The lower extending portion 237 has a protruding portion 237b protruding from the inner peripheral surface. Since the convex portions 237b are arranged in the circumferential direction along the vertical direction at a predetermined interval from each other, the convex portion 237b increases the cross-sectional area of the lower extending portion 237, thereby reducing the lower extending portion 237. The rigidity of can be improved. As a result, it is possible to prevent the lower attachment member 220 from dropping from the vibration isolation base 230 until the vibration isolation device 201 is attached to the vehicle body frame BF. Since the convex portions 237b are provided at a predetermined interval from each other, when the lower extension portion 237 and the lateral extension portion 237a are inserted into the lower through hole 220a of the lower attachment member 220, It can prevent that the downward extension part 237 becomes difficult to elastically deform. Thereby, attachment workability | operativity when attaching the lower attachment member 220 to the lower extension part 237 and the lateral extension part 237a is securable.

29 is a perspective view of the vibration isolation base 230, FIG. 30 is a front view of the vibration isolation base 230, FIG. 31 is a side view of the vibration isolation base 230, and FIG. 32 is a plan view of the vibration isolation base 230. FIG. 33 is a cross-sectional view of the vibration isolator base 230 taken along the line XXXIII-XXXIII in FIG. The anti-vibration base 230 is vulcanized and formed as a separate member from the upper connecting member 110 and the lower connecting member 220, and is interposed between the upper connecting member 110 and the lower connecting member 220 without bonding.

Since the vibration isolation base 230 is vulcanized and molded separately from the upper mounting member 210 and the lower mounting member 220, the degree of freedom in designing a vulcanization mold for vulcanizing the vibration isolation base 230 is improved. Can do. Therefore, as shown in FIG. 33, the

concave portions

238 and 239 and the convex portion 240 that are undercut can be easily formed on the vibration-proof base 230.

In addition, as shown in FIG. 33, the anti-vibration base 230 has a protruding portion 241 that protrudes in a protruding shape corresponding to the convex portion 240 at a position on the insertion hole 230 a side corresponding to the convex portion 240. . Since the thickness of the convex portion 240 can be increased by the raised portion 241 corresponding to the convex portion 240, a spring constant in the left-right direction can be secured.

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 addition, each of the above-described embodiments is a configuration in which a part or a plurality of parts of the configuration of the other embodiments is added to the embodiment or the configuration of the embodiment is within the scope of the present invention. The embodiment may be modified and configured by exchanging with a part or a plurality of parts.

In each of the above-described embodiments, the case where the upper restricting

portions

12, 112, 212 are formed so as to be inclined upward as they move away from the

holes

11a, 111a, 211a has been described, but is not necessarily limited thereto. For example, the upper restricting

portions

12, 112, and 212 can naturally be vertical surfaces extending in the vertical direction (vertical direction). The upper restricting

portions

12, 112, and 212 only need to be able to restrict the positions of the

upper end portions

35, 135, and 235 of the

anti-vibration substrates

30, 130, and 230 when a compression load is applied to the

anti-vibration substrates

30, 130, and 230. Because.

In each of the above-described embodiments, the case where the protruding portions 36 are formed at two locations in the front-rear direction of the

vibration isolation base

30, 130, 230 has been described. Of course, it is possible to form in a plurality of places or a single place.

In each of the above embodiments, the case has been described in which the laterally extending

portions

37a, 137a, and 237a are formed on the entire circumference of the annularly extending

lower portions

37, 137, and 237, but are not necessarily limited thereto. Of course, it is possible to form them at a plurality of locations of the downwardly extending

portions

37, 137, 237 with appropriate intervals.

In the first embodiment, the case where the

concave portions

38 and 39 are arranged in the vertical direction of the vibration-proof base 30 has been described. However, the present invention is not necessarily limited to this, and the second embodiment and the third embodiment are not necessarily limited thereto. As described above, it is naturally possible to adopt a configuration in which the concave portions are not arranged in the vertical direction.

1, 101, 201

Vibration isolator

10, 110, 210

Upper mounting member

11a, 111a, 211a

Hole

12, 112, 212 Upper restricting portion 13a Upper through

hole

20, 220

Lower mounting member

20a, 220a Lower through hole 22 Extension Installation part 23,223 Bottom part (part of extension part)
25,225 Lower inclined part (part of the extended part)
30, 130, 230

Anti-vibration base

30a, 130a,

230a Communication hole

31, 131, 231

Lower end

35, 135, 235 Upper end 36 Projection

36b Injection trace

37, 137, 237

Lower extension

37a, 137a, 237a Horizontally extending

portion

38, 39, 138, 238, 239 Concave portion 240 Convex portion B Axis member BF Body frame BR Bracket PP Power plant

Claims

An upper mounting member attached to the power plant side by a bracket whose lower end side is fixed to the power plant side;
A lower attachment member attached to the body frame side;
An anti-vibration device comprising an anti-vibration base interposed between the lower attachment member and the upper attachment member in a non-adhesive manner and composed of a rubber-like elastic material;
The lower mounting member is formed through in the vertical direction and has a lower through hole through which the bracket is inserted,
An extending portion extending from the periphery of the lower through-hole toward the direction intersecting with the vertical direction,
The upper mounting member includes a hole portion through which an upper end side of a shaft-like member whose lower end side is fixed to the bracket is inserted and fixed,
The vibration-proof base includes an upper end portion that comes into contact with the upper mounting member;
A lower end contacting the extended portion of the lower mounting member;
The lower end portion and the upper end portion communicate with each other in the vertical direction, and include a communication hole through which the bracket and the shaft-like member are provided,
The anti-vibration device according to claim 1, wherein an inner peripheral surface of the communication hole includes a concave portion that is recessed in a direction intersecting with the vertical direction.
The anti-vibration base is interposed between the lower mounting member and the upper mounting member in a state where a vertical compressive load is input,
The anti-vibration device according to claim 1, further comprising a convex portion projecting from the outer peripheral surface in a direction intersecting the vertical direction.
The extending portion of the lower mounting member includes a lower inclined portion that expands outward as the lower end abuts and moves upward,
The upper mounting member includes an upper restricting portion that abuts the upper end portion and restricts deformation to the inside of the upper end portion,
3. The upper restricting portion is opposed to the lower inclined portion, and at least a part thereof is positioned near the center of the communication hole with respect to the lower inclined portion in the horizontal direction. The vibration isolator described in 1.
The vibration-proof base includes a protruding portion that protrudes upward from the upper end portion,
4. The prevention according to claim 1, wherein the upper mounting member includes an upper through hole that is formed to penetrate in the vertical direction and into which the protruding portion is inserted and locked. 5. Shaker.
The anti-vibration device according to claim 4, wherein the protruding portion includes an injection trace portion connected to an injection hole when the anti-vibration base is vulcanized by a vulcanization mold.
The anti-vibration base is a downward extending portion extending downward from the lower end portion;
6. A laterally extending portion extending from the lower extending portion to the outside in the horizontal direction and having a tip positioned outside the lower through hole of the lower mounting member. The vibration isolator of Claim 1.