JP2016050658A - Vibration-proofing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration-proofing device capable of assuring durability while spring constants in two directions crossing at a right angle with an axial direction being made different.SOLUTION: A first fixture 20 is made in such a way that a fastening part 30 having a small-diameter side end part 51 of a vibration-proofing substrate 50 fastened over its circumferential direction shows that an area of the second projecting plane projected in the second direction (a direction Y) is set larger than an area of the first projecting plane projected in the first direction (a direction X). With this arrangement, the spring constant in the first direction is set lower than that in the second direction. Since it is not necessary to let a segment of the vibration-proofing substrate 50 corresponding to the first direction thinner than a segment of the vibration-proofing substrate corresponding to the second direction, it is possible to assure its durability while making spring constants in two directions crossing at a right angle with an axial direction (a direction Z) different to each other.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a vibration isolator, and particularly to a vibration isolator having different spring constants in two directions orthogonal to the axial direction.

  As a vibration isolator that supports a vibration source such as an engine on a vehicle body, for example, a vibration isolator disclosed in Patent Document 1 is known. An anti-vibration device disclosed in Patent Literature 1 includes a shaft-like first attachment attached to the vibration source side (engine side), a cylindrical second attachment attached to the vehicle body side (support side), There is provided a vibration isolating base interposed between the first fixture and the second fixture. The anti-vibration base has a first direction orthogonal to the axial direction of the first fixture (the vehicle left-right direction in Patent Document 1) has a thickness that is orthogonal to the axial direction and the first direction (the vehicle in Patent Document 1). It is formed thinner than the thickness in the front-rear direction). By making the thickness of the anti-vibration base in the first direction thinner than the thickness in the second direction, the spring constant in the first direction can be made smaller than the spring constant in the second direction. As a result, the vibration isolator exhibits a vibration isolation effect in the left-right direction of the vehicle, and can reduce vibration caused by engine run-off. On the other hand, a vibration damping effect is exhibited in the longitudinal direction of the vehicle, and a shock caused by a humming noise during acceleration or sudden acceleration / deceleration can be suppressed.

JP 2010-106866 A

  However, in the above-described technique, since the spring constant in the first direction is made smaller than the spring constant in the second direction, the portion corresponding to the first direction of the anti-vibration base is thinned. .

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a vibration isolator capable of ensuring durability while varying spring constants in two directions orthogonal to the axial direction.

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 shaft-shaped first fixture is attached to one of the vibration source side or the support side, and has a cylindrical shape having an opening in at least one of them. The second fixture is attached to the other of the vibration source side or the support side. The anti-vibration base composed of the rubber-like elastic body has the small-diameter side end fixed to the first fixture, while the large-diameter end having a larger outer diameter than the small-diameter end is the opening of the second fixture. Secured to the side. The first fixture has an axial direction from the area of the first projection surface in which the fixed portion to which the end portion on the small diameter side is fixed in the circumferential direction is projected in a first direction orthogonal to the axial direction of the first fixture. The area of the second projection plane projected in the second direction orthogonal to the first direction is set large. Thereby, the spring constant in the first direction is set smaller than the spring constant in the second direction. As a result, the spring constants in the two directions orthogonal to the axial direction can be made different without making the portion corresponding to the first direction of the vibration isolating base thinner than the portion corresponding to the second direction. Thereby, the fall of durability of a vibration proof base can be controlled. Therefore, there is an effect that durability can be ensured while different spring constants in two directions orthogonal to the axial direction.

  According to the vibration isolator of claim 2, since the anti-vibration base is not formed with a pierced hole in the wall portion interposed between the first fixture and the second fixture, the surface of the wall portion Change in shape can be suppressed. Therefore, damage to the wall due to stress concentration can be prevented. Therefore, in addition to the effect of the first aspect, there is an effect that the durability of the vibration-proof substrate can be improved.

  According to the vibration isolator of the third aspect, in the fixing portion, the curved concave portion whose inclination angle with respect to the axial direction increases from the distal end in the axial direction toward the base side forms the first projection surface. Formed on the surface. As a result, in addition to the effect of the first or second aspect, there is an effect that the area of the first projection plane can be easily made smaller than the area of the second projection plane by the recess formed in the first plane.

  According to the vibration isolator of claim 4, the first fixture is connected to the fixing portion and is attached to the outer surface of the attachment portion attached to the counterpart member or the seat of the attachment portion contacting the counterpart member. An engaging portion for positioning is formed on the surface corresponding to the first direction or the second direction. Therefore, in addition to the effect of any one of claims 1 to 3, there is an effect that it is possible to prevent an error in assembling the first fixture when the vibration isolator is assembled.

It is a top view of the vibration isolator in 1st Embodiment of this invention. It is sectional drawing of the vibration isolator in the II-II line of FIG. It is sectional drawing of the vibration isolator in the III-III line of FIG. It is a perspective view of a vibration isolator. (A) is a side view of the 1st fixture seen from the 1st direction, (b) is a side view of the 1st fixture seen from the 2nd direction. (A) is the side view which looked at the 1st fixture of the vibration isolator in 2nd Embodiment from the 1st direction, (b) is the side view of the 1st fixture seen from the 2nd direction.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the accompanying drawings. FIG. 1 is a plan view of a vibration isolator 10 according to the first embodiment of the present invention, FIG. 2 is a cross-sectional view of the vibration isolator 10 taken along the line II-II in FIG. 1, and FIG. FIG. 4 is a cross-sectional view of the vibration isolator 10 taken along line -III, and FIG. 4 is a perspective view of the vibration isolator 10. In the figure, arrow X, arrow Y, and arrow Z respectively indicate the front-rear direction, the left-right direction, and the up-down direction of the automobile on which the vibration isolator 10 is mounted. The vertical direction (Z direction) is the main vibration input direction of the vibration isolator 10 and is the axial direction. 2 and 3 shows a no-load state. For the sake of convenience, FIG. 3 does not show the diaphragm 60, the partition member 80, and the like.

  The vibration isolator 10 is an engine mount that elastically supports an automobile engine. As shown in FIG. 1, the vibration isolator 10 includes a first attachment 20 attached to an engine (not shown) that is a vibration source, and a support vehicle body ( A second fixture 40 attached to the first fixture 20 and a second fixture 40, and an anti-vibration base 50 made of a rubber-like elastic body that is connected between the first fixture 20 and the second fixture 40. ing.

  As shown in FIGS. 2 and 3, the first fixture 20 is a shaft-shaped casting product integrally formed of an iron-based material, an aluminum alloy, or the like, and contacts a counterpart member (not shown) such as an engine. This is a high-rigidity boss fitting that includes a mounting portion 21 having a seating surface 22 that comes into contact therewith, and a fixing portion 30 that is connected to the mounting portion 21. The fixing part 30 is a part where the vibration isolation base 50 is fixed to the outer surface (the tip surface 31, the first surface 32, and the second surface 33). The first fixture 20 is attached to the engine side such that the first surface 32 of the fixing portion 30 faces the Y direction (vehicle left-right direction) and the second surface 33 faces the X direction (vehicle front-rear direction).

  The attachment portion 21 is a portion formed in a flange shape that protrudes radially outward from the base portion of the fixing portion 30, and is formed in a substantially disk shape having an outer peripheral surface 23. In the present embodiment, the attachment portion 21 is set such that the outer diameter dimension of the outer peripheral surface 23 is larger than the outer diameter dimension of the fixing portion 30. In addition, the attachment portion 21 is formed with a bolt hole 25 that opens into the seat surface 22 and extends into the fixing portion 30 along the axial direction (Z direction). The first fixture 20 is attached to a counterpart member (not shown) such as an engine via a bolt (not shown) screwed into the bolt hole 25.

  As shown in FIG. 4, the mounting portion 21 has two projecting portions 26 (engagement portions) provided at two locations on the seating surface 22 (X direction with respect to the bolt holes 25) with the bolt hole 25 interposed therebetween. The protruding portion 26 protrudes from the seat surface 22 in the axial direction (Z direction). Further, the mounting portion 21 is formed with two parallel surfaces 24 (engagement portions) at positions facing the outer peripheral surface 23 in the Y direction. The engaging portion (the two surfaces 24 and the protruding portion 26) is engaged with an engaged portion (not shown) such as a hole, a depression, or a protrusion formed in a counterpart member such as an engine, and the counterpart side. This is a part for positioning the first fixture 20 with respect to the member. Since the engaging portion is provided in the mounting portion 21, it is possible to prevent an assembly error (incorrect mounting direction of the first mounting tool 20) from occurring when the vibration isolator 10 is assembled.

  Returning to FIG. The second fixture 40 is a cylindrical high-rigidity member having an inner diameter larger than the outer diameter of the fixing portion 30, and has openings 41 and 42 at both ends in the axial direction. The first fixture 20 is arranged on one opening 41 side of the openings 41 and 42 so as to be spaced apart on the same axis with respect to the second fixture 40 with the fixing portion 30 facing the opening 41. Is done. The first fixture 20 and the second fixture 40 are elastically connected to each other by the vibration isolation base 50.

  The anti-vibration base 50 is a member composed of a rubber-like elastic body, and has a substantially truncated cone having a small-diameter end 51 on one end side in the axial direction (Z direction) and a large-diameter end 52 on the other end. It is formed in a shape. The small diameter side end portion 51 is a portion where the outer surface of the fixing portion 30 of the first fixture 20 is vulcanized and bonded, and the fixing portion 30 is vulcanized and bonded, whereby the fixing portion 30 is attached to the small diameter side end portion 51. Buried. The large-diameter side end portion 52 is a portion having an outer diameter larger than that of the small-diameter side end portion 51, and the outer peripheral surface of the large-diameter side end portion 52 is on the inner peripheral surface on the opening 41 side of the second fixture 40. Vulcanized and bonded. The anti-vibration base 50 is vulcanized and bonded to the first fixture 20 and the second fixture 40, so that the wall portion 53 that closes the opening 41 of the second fixture 40 is attached to the first fixture 20 and the second fixture 40. It is interposed between the tools 40.

  The anti-vibration base body 50 is formed with a recess 54 that opens on the end face in the axial direction of the large-diameter side end portion 52. The recess 54 has a substantially bowl shape that gradually decreases in diameter as it approaches the first fixture 20 side along the axial direction. The anti-vibration base 50 is provided with a seal layer 55 over the entire circumference of the outer peripheral edge of the large-diameter end 52. The seal layer 55 is a portion extending in the axial direction from the outer peripheral edge portion of the large-diameter side end portion 52, and is attached to the second fixture 40 so as to cover the inner peripheral surface of the second fixture 40. Is done.

  As for the 2nd fixture 40, the diaphragm 60 arrange | positioned facing the large diameter side edge part 52 (recess 54) of the vibration isolator base 50 is attached to the opening part 42. As shown in FIG. The diaphragm 60 is a substantially circular flexible film made of a rubber-like elastic body, and a fixing fitting 61 is vulcanized and bonded to the outer peripheral edge portion. The fixing fitting 61 is formed in a substantially annular shape, and the inner peripheral surface thereof is fixed to the outer peripheral surface of the diaphragm 60 over the entire periphery. After the diaphragm 60 is inserted into the second fixture 40 from the opening 42, the diameter of the second fixture 40 is reduced, and the diaphragm 60 is fixed to the second fixture 40 via the fixing bracket 61.

  A liquid (an incompressible fluid such as water) is sealed in a sealed space defined by the second fixture 40, the vibration isolating base 50, and the diaphragm 60, thereby forming a liquid chamber. The liquid chamber is partitioned by the partition member 80 into a pressure receiving chamber 71 in which the vibration isolation base 50 forms part of the chamber wall and an equilibrium chamber 72 in which the diaphragm 60 forms part of the chamber wall.

  The partition member 80 divides the liquid chamber into a pressure receiving chamber 71 and an equilibrium chamber 72 and is a member for forming an orifice channel 73 that communicates the pressure receiving chamber 71 and the equilibrium chamber 72 with each other. It is formed in a circular shape. In the present embodiment, a highly rigid cylinder 81 in which an annular flange is formed on one end side in the axial direction, a rubber-like elastic partition plate 82 whose outer edge is vulcanized and bonded to the cylinder 81, and A convex part 83 made of a rubber-like elastic body that is provided continuously with the partition 82 and protrudes from the other end of the cylinder 81 is provided. The partition 82 is fixed to the second fixture 40 via the cylinder 81 by reducing the diameter of the second fixture 40 after the partition member 80 is inserted into the second fixture 40 from the opening 42. The Further, the convex portion 83 is compressed in the axial direction between the cylindrical body 81 and the fixing bracket 61, whereby the orifice flow path 73 and the equilibrium chamber 72 are separated.

  Next, the 1st fixture 20 is demonstrated with reference to FIG. FIG. 5A is a side view of the first fixture 20 as viewed from the first direction (X direction, the direction perpendicular to the paper surface), and FIG. 5B is a view from the second direction (Y direction, the direction perpendicular to the paper surface). FIG. 6 is a side view of the first fixture 20. As shown in FIGS. 5A and 5B, the fixing portion 30 of the first fixture 20 has an outer edge (a tip surface 31 and a first projection surface 31 and a first projection surface projected in the first direction (X direction)). The first surface 32) is surrounded by outer edges (tip surface 31 and second surface 33) that form a second projection surface projected in the second direction (Y direction). The tip surface 31, the first surface 32, and the second surface 33 are smoothly connected.

  As shown in FIG. 5A, the fixing portion 30 of the first fixture 20 has a Y-direction dimension from the distal end surface 31 along the axial direction (Z direction) to the mounting portion 21 (the base side of the fixing portion 30). It is set to gradually increase as it goes to. In particular, the first surface 32 (concave portion) facing in the Y direction is inclined with respect to the axial direction (an angle formed between the tangent line of the first surface 32 and the axis line as it goes from the front end surface 31 to the mounting portion 21 along the axial direction. ) Is increased in a curved shape (concave shape).

  Further, the tip surface 31 has a dimension in the X direction (see FIG. 5B) larger than the dimension in the Y direction, and the second surface 33 facing in the X direction is along the axial direction (Z direction). Thus, as it goes from the front end surface 31 toward the attachment portion 21, it is formed in a curved shape (convex shape) in which the angle of inclination with respect to the axial direction (the angle formed between the tangent to the second surface 33 and the axis) decreases. The second surface 33 includes a first projection surface (a region surrounded by the tip surface 31 and the pair of first surfaces 32) and a second projection surface (a region surrounded by the tip surface 31 and the pair of second surfaces 33). Is overlaid in the X direction from the first surface 32, the area of the second projection plane (see FIG. 5B) from the area of the first projection plane (see FIG. 5A). Is set large.

  Thereby, the spring constant of the 1st direction (X direction) with a small area of the projection surface with respect to the anti-vibration base | substrate 50 can be set smaller than the spring constant of a 2nd direction (Y direction). The vibration isolator 10 sets the vibration constant in the vehicle front-rear direction by setting the spring constant in the first direction (X direction, vehicle front-rear direction) smaller than the spring constant in the second direction (Y direction, vehicle left-right direction). Demonstrate and reduce vibration caused by acceleration and deceleration. On the other hand, a vibration damping effect is exhibited in the vehicle left-right direction, and riding comfort can be improved.

  Further, the spring constants in the two directions orthogonal to the axial direction (Z direction) can be made different without making the portion corresponding to the first direction of the vibration isolating substrate 50 thinner than the portion corresponding to the second direction. Since the anti-vibration substrate 50 does not have to be partially thinned, the durability of the anti-vibration substrate 50 can be prevented from being lowered. Therefore, durability can be ensured while different spring constants in two directions orthogonal to the axial direction.

  Further, since the areas of the projection surfaces in the two directions of the fixing portion 30 of the first fixture 20 are only made different, the wall portion 53 (the vibration isolation base 50) in the first direction (X direction) and the second direction (Y direction). The free length of the wall portion 53 can be prevented from being shortened. As a result, even when a large displacement is input between the first fixture 20 and the second fixture 40, buckling of the wall portion 53 can be prevented, and excellent durability can be realized.

  In addition, the anti-vibration base body 50 is not formed with a hole in the inner surface on the liquid chamber side of the wall portion 53 interposed between the first fixture 20 and the second fixture 40 or the outer surface on the opposite side. Therefore, the change of the surface shape of the wall part 53 can be suppressed. Therefore, damage to the wall portion 53 due to stress concentration can be prevented. Therefore, the durability of the vibration proof substrate 50 can be improved. Further, since the shape of the vibration isolating substrate 50 is close to the existing shape, there is no need to change the mold for vulcanization molding of the vibration isolating substrate 50 (or the change of the mold can be minimized). As a result, existing facilities can be used effectively.

  In addition, since the adhering portion 30 is a part of the second fixture 20 that is a cast product, the rigidity can be increased. In addition, the fixing portion 30 forms a first projection surface in a curved shape (concave shape) in which an inclination angle with respect to the axial direction (Z direction) increases from the distal end surface 31 toward the base side (attachment portion 21 side). A first surface 32 is formed. As a result, the curved first surface 32 (concave portion) allows the area of the first projection surface to be easily made smaller than the area of the second projection surface. Thereby, the shape design of the 1st surface 32 and the 2nd surface 33 of the adhering part 30 can be made easy.

  In addition, the first surface 32 is formed in a curved shape (concave shape) in which the inclination angle with respect to the axial direction increases as it goes from the distal end surface 31 toward the mounting portion 21 along the axial direction, so the first surface 32 with respect to the axial direction. The area of the first surface 32 can be increased as compared with the case where the inclination angle is constant (when the first surface 32 is a flat surface). By making the first surface 32 curved (concave), the adhesion area of the vibration-proofing substrate 50 can be made larger than when the first surface 32 is flattened. Adhesive strength can be improved.

  Further, the first surface 32 is formed in a curved shape (concave shape) in which the inclination angle with respect to the axial direction increases as it goes from the front end surface 31 to the attachment portion 21 along the axial direction, while the second surface 33 is in the axial direction. Since it is formed in a curved shape (convex surface shape) with a small inclination angle with respect to, an undercut can be prevented from being made. Therefore, the structure of the shaping | molding die (not shown) for casting the 1st fixture 20 can be simplified.

  Next, a second embodiment will be described with reference to FIG. In 1st Embodiment, the case where the whole 1st surface 32 of the 1st fixture 20 was formed in concave shape was demonstrated. On the other hand, 2nd Embodiment demonstrates the case where the recessed part 103 is formed in a part of 1st surface 102 of the 1st fixture 90. FIG. In addition, about the part same as the part demonstrated in 1st Embodiment, the same code | symbol is attached | subjected and the following description is abbreviate | omitted. 6A is a side view of the first attachment 90 of the vibration isolator according to the second embodiment as viewed from the first direction (X direction), and FIG. 6B is the second direction (Y direction). It is the side view of the 1st fixture 90 seen from. The first fixture 90 is fixed to the vibration isolation base 50 in place of the first fixture 20 of the vibration isolation device 10 described in the first embodiment.

  As shown in FIGS. 6 (a) and 6 (b), the first fixture 90 is a shaft-shaped cast product integrally formed of an iron-based material, an aluminum alloy or the like, and is used as a counterpart member such as an engine. An attachment portion 91 to be attached and an adhering portion 100 connected to the attachment portion 91 are provided. The fixing part 100 is a part where the vibration isolation base 50 is fixed to the outer surface (the tip surface 101, the first surface 102, and the second surface 110). The fixing portion 100 of the first fixture 90 includes an outer edge (a tip surface 101 and a pair of first surfaces 102) and a second direction (Y direction) that form a first projection surface projected in the first direction (X direction). Is surrounded by an outer edge (a tip surface 101 and a pair of second surfaces 110) that forms a second projection surface projected onto the surface. The tip surface 101, the first surface 102, and the second surface 110 are smoothly connected.

  As shown in FIG. 6A, in the fixing portion 100 of the first fixture 90, the first surface 102 facing in the Y direction has a constant inclination angle with respect to the axial direction (the angle formed between the first surface 102 and the axis). It is formed in a flat shape. As a result, the first projection surface is made wider on the base side (mounting portion 91 side) having a larger dimension in the Y direction than the front end surface 101 side. The first surface 102 has a recess 103 formed at a substantially intermediate position in the axial direction. The concave portion 103 is a portion for reducing the area of the first projection surface formed by the first surface 102, and with respect to the axial direction (Z direction) from the distal end surface 101 toward the base side (mounting portion 91 side). It has a curved portion where the inclination angle increases. The area of the first projection surface created by the tip surface 101 and the first surface 102 can be reduced by the amount of the depression due to the recess 103.

  As shown in FIG. 6B, the tip surface 101 has a dimension in the X direction larger than a dimension in the Y direction. The second surface 110 facing in the X direction is connected to the inclined surface 111 and the inclined surface 111 that extends toward the outer side in the X direction as it approaches the attachment portion 91 along the axial direction while being connected to the tip surface 101. And a vertical surface 112 extending in the axial direction. The vertical surface 112 and the inclined surface 111 are smoothly connected by the boundary surface 113.

  The second surface 110 overlaps the first projection surface (the range surrounded by the tip surface 101 and the pair of first surfaces 102) and the second projection surface (the range surrounded by the tip surface 101 and the second surface 110). In this case, the area of the second projection plane (see FIG. 6B) is larger than the area of the first projection plane (see FIG. 6A). Is set larger. Thereby, similarly to the first embodiment, the spring constant in the first direction (X direction) having a small area of the projection surface with respect to the vibration isolating base 50 can be set smaller than the spring constant in the second direction (Y direction).

  The recess 103 is formed on the inner side of the outer edge (the tip surface 101 and the pair of second surfaces 110) that affects the area of the second projection surface. Therefore, the area of the first projection plane can be reduced by the amount corresponding to the depression of the recess 103 without changing the size of the area of the second projection plane. Therefore, the adjustment for reducing the spring constant in the first direction (X direction) can be facilitated without changing the spring constant in the second direction (Y direction).

  The position where the concave portion 103 is formed on the first surface 102 is the horizontal direction of the boundary surface 113 that connects the inclined surface 111 of the second surface 110 and the vertical surface 112. Thereby, compared with the case where the recessed part 103 is formed near the attaching part 91 (the horizontal position of the vertical surface 100 on the base side of the fixing part 100), the recessed part 103 is damaged by the notch effect or the like. And can cause a reduction in rigidity.

  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. For example, the shapes of the first fixtures 20 and 90, the second fixture 40 and the vibration isolation base 50, the positions of the first fixtures 20 and 90 with respect to the second fixture 40, and the like may be set as appropriate according to required characteristics. Is possible.

  In the above embodiment, the case of the liquid-sealed vibration isolator 10 that encloses a liquid between the vibration isolator base 50 and the diaphragm 60 has been described, but the present invention is not necessarily limited thereto. Of course, it is possible to omit the diaphragm 60, the partition member 80, etc., and to apply to a non-liquid-sealed vibration isolator that uses only the vibration isolator base 50 (characteristics of the rubber-like elastic body). This is because even in a non-liquid-sealed vibration isolator, the spring constants in two directions orthogonal to the axial direction can be made different depending on the shape of the first fixture 20.

  Moreover, although the said embodiment demonstrated the anti-vibration apparatus 10 provided with the 2nd fixture 40 and the anti-vibration base | substrate 50 which are formed in a substantially circular shape seeing in an axial direction, it is not necessarily restricted to this. For example, it is naturally possible to form the shapes (outer shapes) of the second fixture 40 and the vibration-proof base 50 in an elliptical shape or an elliptical shape when viewed in the axial direction. Thereby, the installation space of a vibration isolator can be used effectively and the mounting property to a motor vehicle etc. can be improved. The oval shape is an oval shape or a competition track shape, that is, a shape formed by two semicircles having the same size and two straight lines smoothly connecting them.

  In the said embodiment, the 1st direction with a small area of the projection surface of the adhering parts 30 and 100 (1st fixtures 20 and 90) is arrange | positioned in the vehicle front-back direction, and the area of the projection surface of the adhering parts 30 and 100 is large. The case where the second direction is arranged in the left-right direction of the vehicle has been described. However, the present invention is not necessarily limited to this, and according to the required performance, the first direction in which the area of the projection surface of the fixing portions 30, 100 is small is arranged in the left-right direction of the vehicle, and the projection surface of the fixing portions 30, 100 Of course, it is possible to arrange the second direction having a large area in the vehicle longitudinal direction. By arranging the vibration isolator 10 in this way, the spring constant in the vehicle left-right direction can be made smaller than the spring constant in the vehicle front-rear direction.

  In the above embodiment, the case where the engine serving as the vibration source is attached to the first fixtures 20 and 90 and the support-side vehicle body is attached to the second fixture 40 has been described, but the present invention is not necessarily limited thereto. It is naturally possible to attach the first fixtures 20 and 90 to the support side (vehicle body) and the second fixture 40 to the vibration source (engine) using a bracket (not shown) as appropriate.

  Although the case where the vibration isolator 10 is used as an engine mount that elastically supports an automobile engine has been described in the above embodiment, the present invention is not necessarily limited thereto. The present invention is not limited to a vibration isolator for automobiles, and can naturally be applied to a vibration isolator used for trains, motorcycles, bicycles, and the like. Further, it is naturally possible to apply not only engine mounts but also various vibration isolators such as body mounts and differential mounts.

DESCRIPTION OF SYMBOLS 10 Anti-vibration apparatus 20,90 1st fixture 21,91 Attachment part 22 Seat surface 23 Outer peripheral surface 24 Two surfaces (engagement part)
26 Projection (engagement part)
30,100 Adhering portion 32 First surface (concave portion)
33 Second surface 40 Second fixture 41 Opening portion 50 Anti-vibration base 51 Small-diameter side end portion 52 Large-diameter side end portion 53 Wall portion 102 First surface 103 Recessed portion 110 Second surface X First direction Y Second direction Z-axis direction

Claims (4)

A shaft-shaped first fixture attached to one of the vibration source side or the support side;
A cylindrical second fixture that is attached to the other of the vibration source side or the support side and that has an opening in at least one of the two;
A rubber-like elastic body in which a small-diameter end is fixed to the first fixture, and a large-diameter end having a larger outer diameter than the small-diameter end is fixed to the opening of the second fixture. An anti-vibration base composed of
The first fixture has an area of a first projection surface in which a fixed portion to which the end portion on the small diameter side is fixed in the circumferential direction is projected in a first direction orthogonal to the axial direction of the first fixture. The spring constant in the first direction is smaller than the spring constant in the second direction by setting the area of the second projection surface projected in the second direction orthogonal to the axial direction and the first direction. Anti-vibration device characterized by being set.   The anti-vibration device according to claim 1, wherein the anti-vibration base is not formed with a straight hole in a wall portion interposed between the first fixture and the second fixture.   The fixing portion is characterized in that a curved concave portion whose inclination angle with respect to the axial direction increases from the tip end in the axial direction toward the base side is formed on the first surface forming the first projection surface. The vibration isolator according to claim 1 or 2.   The first fixture is provided in the first direction on the outer peripheral surface of the attachment portion that is connected to the fixing portion and attached to the counterpart member, or on the seat surface of the attachment portion that contacts the counterpart member. The vibration isolator according to any one of claims 1 to 3, further comprising a positioning engaging portion formed corresponding to the second direction.

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