JP5568522B2 - Damper mount - Google Patents

Description

  The present invention relates to a damper mount that supports a shock absorber of a suspension against vibration against a vehicle body.

  Conventionally, in a strut-type suspension mechanism, the upper end portion of a strut provided with a shock absorber is vibration-proof connected or vibration-proof supported via a damper mount with respect to the vehicle body. This damper mount has a structure in which an inner member and an outer member spaced apart on the outer peripheral side thereof are elastically connected by a cylindrical rubber elastic body, and the inner member is attached to the shock absorber via a bearing. In addition, the outer member is attached to the vehicle body. For example, Japanese Patent Application Laid-Open No. 2004-232824 (Patent Document 1) is one example.

  By the way, the damper mount attached to the connecting portion between the suspension mechanism that supports the wheels and the vehicle body is required to have a function of sufficiently reducing the input from the road surface side. More specifically, in order to reduce the transmission rate of the input from the road surface to the vehicle body, it is desirable that the spring constant in the direction perpendicular to the axis of the damper mount is set low.

  However, in the damper mount described in Patent Document 1, the inner member and the outer member are overlapped in the projection in the direction perpendicular to the axis, and the cylindrical rubber elastic body is continuously disposed between the inner member and the outer member. Has been. As a result, the cylindrical rubber elastic body is compressed between the inner member and the outer member at the time of vibration input in the direction perpendicular to the axis, so that the dynamic spring constant in the direction perpendicular to the axis tends to increase. In some cases, a damper mount that can realize a lower spring constant in the direction is required.

  In order to realize a low spring constant in the direction perpendicular to the axis, if the axial spring constant is set to be very low, the amount of relative displacement between the inner member and the outer member increases when axial vibration is input, and the cylindrical rubber There is a risk of cracks in the elastic body, and a decrease in durability becomes a problem.

JP 2004-232824 A

  The present invention has been made in the background of the above-mentioned circumstances, and the problem to be solved is a spring in a direction perpendicular to the axis while ensuring sufficient durability and suppressing a decrease in the spring constant in the axis direction. An object of the present invention is to provide a damper mount having a novel structure capable of reducing the constant.

According to a first aspect of the present invention, an inner member that is attached to a shock absorber via a bearing and an outer member that is spaced apart from the inner member and attached to a vehicle body are elastically connected by a cylindrical rubber elastic body. In the damper mount having the above-described structure, the outer member is disposed above the mounting position of the bearing with respect to the inner member, while the cylindrical rubber elastic body is disposed between the inner member and the outer member. An inner peripheral straight portion that opens upward in the axial direction on the upper surface is formed, and an outer peripheral straight portion that opens downward in the axial direction on the lower surface of the cylindrical rubber elastic body on the outer peripheral side of the inner peripheral straight portion. parts are formed, and, has a first tapered tube portion in which the inner member is lower inclined toward the outer side, wherein the outer member is an outer peripheral Has a second tapered tube portion which lower inclined towards the angle of inclination with respect to the axial direction of the first tapered tubular portion: theta ₁ is an inclination angle with respect to the axial direction of the second tapered tube portion: from theta ₂ It is also characterized by being made larger .

  According to the damper mount having the structure according to the first aspect as described above, the inner peripheral straight portion that opens upward in the axial direction on the upper surface of the cylindrical rubber elastic body, and the axial direction on the lower surface of the cylindrical rubber elastic body. An outer peripheral straight portion that opens downward is formed, and the portion of the cylindrical rubber elastic body that is compressed in the direction perpendicular to the axis between the inner member and the outer member is reduced. Therefore, when the vibration in the direction perpendicular to the axis is input, shear deformation is dominant in the cylindrical rubber elastic body, and the spring in the direction perpendicular to the axis is softened. Therefore, the vibration input from the road surface such as road noise is not applied to the vehicle body. Can be prevented from being transmitted to

  In addition, since the outer member is disposed above the mounting position of the bearing with respect to the inner member, a rubber volume of the cylindrical rubber elastic body is secured, and durability is improved.

  Furthermore, since the arrangement position of the outer member with respect to the inner member is set upward, the overlapping portion of the inner member and the outer member in the projection in the direction perpendicular to the axis is reduced, and the inner member and the outer member are moved in the radial direction. It is possible to sufficiently secure the rubber volume of the cylindrical rubber elastic body without greatly separating it. Therefore, at the time of vibration input in the direction perpendicular to the axis, shear deformation is predominantly generated in the cylindrical rubber elastic body, and the spring in the direction perpendicular to the axis can be softened. The elastic body can be sufficiently compressed and deformed to obtain a spring that is hard in the axial direction. As a result, the ratio of the axially perpendicular spring to the axial spring is reduced, and an excellent anti-vibration effect against input vibration from the road surface is exhibited, and sufficient durability and steering stability are realized. The

  In short, simply forming the inner and outer peripherally-curved portions in the cylindrical rubber elastic body makes the spring perpendicular to the axial direction softer, resulting in a decrease in durability due to a decrease in the rubber volume and the axial spring. Can cause problems such as softening. Therefore, the outer member is disposed above the bearing mounting position of the inner member, so that the rubber volume is sufficiently secured in the axial direction, and between the inner member and the outer member in the cylindrical rubber elastic body. The portion compressed in the axial direction is enlarged. As a result, a decrease in durability is avoided and the axial spring is maintained without becoming unnecessarily soft.

In addition, the inner peripheral straight portion is opened upward in the axial direction on the upper surface of the cylindrical rubber elastic body, and the outer peripheral straight portion is opened downward in the axial direction on the lower surface of the cylindrical rubber elastic body. Therefore, the vulcanization mold for the cylindrical rubber elastic body can be divided into two vertically. Thereby, it is possible to perform demolding work after vulcanization molding in a narrow space, and productivity can be improved.
Further, according to the first embodiment, the second inclination angle of the tapered tube portion which is set according to the mounting structure of a vehicle body-side: relative theta _2, the inclination angle of the first tapered tubular portion: increased theta ₁ Then, by bringing the first tapered cylindrical portion closer to the horizontal, a hard spring in the axial direction and a soft spring in the direction perpendicular to the axis are realized.

  According to a second aspect of the present invention, in the damper mount described in the first aspect, the inner member has a first taper cylindrical portion inclined downward toward the outer peripheral side, and the outer member faces the outer peripheral side. The cylindrical rubber elastic body is continuously disposed on a line that linearly connects the outer peripheral end of the inner member and the inner peripheral end of the outer member. It is what has been.

  According to the second aspect, the inner member has the first tapered cylindrical portion, and the outer member has the second tapered cylindrical portion, so that the cylindrical rubber elasticity is obtained when the axial vibration is input. Compression deformation is more dominant in the body, and the axial spring can be prevented from being softened by the formation of the inner peripheral and outer peripheral straight portions. On the other hand, at the time of vibration input in the direction perpendicular to the axis, the shear deformation becomes more dominant in the cylindrical rubber elastic body, so that a soft spring can be obtained in the direction perpendicular to the axis, and the vibration insulation effect is advantageously exhibited.

  Furthermore, the outer peripheral end of the inner member and the inner peripheral end of the outer member are elastically connected linearly and continuously by a cylindrical rubber elastic body, so that when the vibration is input in the axial direction, the inner member The cylindrical rubber elastic body is compressed between the outer peripheral end and the inner peripheral end of the outer member. Therefore, the axial spring is kept sufficiently hard, and excellent steering stability and durability are realized.

  In addition, since the static support load of the vehicle body is input between the inner member and the outer member in the mounting state on the vehicle, the vehicle body is fixed between the outer peripheral end portion of the inner member and the inner peripheral end portion of the outer member. The formed cylindrical rubber elastic body bulges and deforms. As a result, a large portion of the cylindrical rubber elastic body that is compressed between the inner member and the outer member is secured, and the steering stability and durability are improved by preventing the axial spring from becoming soft. .

  According to a third aspect of the present invention, in the damper mount described in the second aspect, an inner flange portion is provided at an inner peripheral end portion of the outer member, and the outer flange end of the inner flange portion and the inner member is provided. The said cylindrical rubber elastic body is continuously arrange | positioned on the area | region which connects a part linearly.

  According to the third aspect, the inner flange portion is provided at the inner peripheral end of the outer member, and the cylindrical rubber elastic body is continuously disposed between the inner flange portion and the inner member, whereby the shaft At the time of vibration input in the direction, it is possible to ensure a large portion of the cylindrical rubber elastic body that is mainly compressed and deformed. Therefore, the axial spring can be set relatively hard, and excellent steering stability and durability can be realized.

  In particular, since the inner flange portion extends in a direction substantially perpendicular to the axis, the cylindrical rubber elastic body is more efficiently compressed between the inner member and the outer member when an axial vibration is input, and the axial spring Is harder than a spring perpendicular to the axis.

  According to a fourth aspect of the present invention, in the damper mount described in any one of the first to third aspects, the deepest portion of the inner peripheral straight portion and the deepest portion of the outer peripheral straight portion are positioned in the axial direction. Are the same.

  According to the fourth aspect, in the cylindrical rubber elastic body, the portion that overlaps both the inner member and the outer member in the projection in the direction perpendicular to the axis is eliminated or made extremely small. In the rubber elastic body, shear deformation becomes dominant, and an excellent vibration-proof performance by a soft spring is realized.

  In addition, since the axial position of the deepest portion of the inner peripheral straight portion and the deepest portion of the outer peripheral straight portion is the same, shear deformation is dominant in the cylindrical rubber elastic body at the time of vibration input in the direction perpendicular to the axis. In addition, the size of the inner periphery and the outer periphery is made relatively small. As a result, a sufficiently soft spring in the direction perpendicular to the axis is realized, and a rubber volume is efficiently secured to improve durability.

  According to a fifth aspect of the present invention, in the damper mount described in any one of the first to third aspects, the bottom of the inner peripheral straight portion and the bottom of the outer peripheral straight portion are projected in a direction perpendicular to the axis. Are overlapping each other.

  According to the fifth aspect, since there is no portion compressed between the inner member and the outer member in the direction perpendicular to the axis in the cylindrical rubber elastic body, shearing occurs in the cylindrical rubber elastic body during vibration input in the direction perpendicular to the axis. Deformation becomes dominant, and excellent vibration-proof performance by the soft spring is realized.

  In particular, in the single state before mounting on the vehicle, the bottom of the inner peripheral curving portion and the bottom of the outer peripheral curling portion overlap, so that even after the cylindrical rubber elastic body is elastically deformed by mounting on the vehicle, The portion of the cylindrical rubber elastic body that is compressed in the direction perpendicular to the axis is reduced, and a soft spring in the direction perpendicular to the axis is realized.

  According to the present invention, the inner peripheral straight portion that opens to the upper surface of the cylindrical rubber elastic body, and the outer peripheral straight portion that opens to the lower surface of the cylindrical rubber elastic body on the outer peripheral side of the inner peripheral straight portion are formed. Yes. Therefore, at the time of vibration input in a direction perpendicular to the axis, shear deformation is dominant in the cylindrical rubber elastic body, and the vibration insulation effect by the soft spring is effectively exhibited. Furthermore, the outer member is disposed above the bearing mounting position, and is positioned above the inner member. As a result, it is possible to reduce the distance between the inner member and the outer member in the direction perpendicular to the axis while sufficiently securing the rubber volume, and to suppress the softening of the spring in the axial direction. Therefore, the steering stability of the vehicle and the durability of the cylindrical rubber elastic body can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS The longitudinal cross-sectional view which shows the damper mount as a 1st Embodiment of this invention in the non-mounting state (single-unit state) to a vehicle. The longitudinal cross-sectional view which shows the damper mount shown by FIG. 1 in the mounting state to a vehicle. The longitudinal cross-sectional view which shows the damper mount as a 2nd Embodiment of this invention in the non-mounting state (single-unit state) to a vehicle.

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

  FIG. 1 shows a damper mount 10 as a first embodiment of the present invention. The damper mount 10 has a substantially constant vertical cross-sectional shape over the entire circumference, and an inner member 12 attached to a shock absorber 64 of a strut 58 described later, and an outer member 14 attached to a vehicle body 60 also described later. However, it has the structure connected with the cylindrical rubber elastic body 16. FIG. 1 shows the damper mount 10 in a single state before being mounted on the vehicle, and unless otherwise specified, the vertical direction refers to the vertical direction in FIG.

More specifically, the inner member 12 has a substantially cylindrical shape that expands downward as a whole, and includes a first tapered cylindrical portion 26. The first taper cylinder portion 26 has a tapered shape that gradually increases in diameter toward the lower side, and has a vertical cross-sectional shape that is inclined downward at a substantially constant angle toward the outer peripheral side. In addition, the inclination angle with respect to the axial direction of the first tapered cylindrical portion 26 is θ ₁ .

  A first outer peripheral cylindrical portion 28 is provided at the outer peripheral end of the inner member 12. The first outer peripheral cylindrical portion 28 is formed integrally with the first tapered cylindrical portion 26 and extends downward from the outer peripheral end of the first tapered cylindrical portion 26. Furthermore, the lower end part of the 1st outer periphery cylinder part 28 is bend | folded to the outer peripheral side, and the lower end protrusion part 30 which protrudes to an outer peripheral side is integrally formed.

  Further, an attachment portion 32 is integrally formed on the inner peripheral side of the first tapered cylindrical portion 26. The attachment portion 32 has a quadrangular arc-shaped curved shape in the longitudinal section, and gradually inclines toward the inner periphery as it goes upward, and the inclination angle continuously changes so as to approach the horizontal as it goes upward. doing. Further, the inner peripheral end portion (upper end portion) of the inner member 12 is provided with an inner peripheral cylindrical portion 34 having a substantially cylindrical shape, and is integrated so as to extend upward from the inner peripheral end of the mounting portion 32. Is formed. A communication hole 36 is formed through the intermediate portion of the attachment portion 32 in consideration of the filling property of the rubber material at the time of vulcanization molding of the cylindrical rubber elastic body 16.

  The outer member 14 has a substantially cylindrical shape that expands downward as a whole, has a larger diameter than the inner member 12, and includes a second tapered cylindrical portion 38. The second taper cylindrical portion 38 has a tapered shape that gradually increases in diameter toward the lower side, and has a vertical cross-sectional shape that is inclined downward at a substantially constant angle toward the outer peripheral side.

Furthermore, the inclination angle θ ₂ with respect to the axial direction of the second taper cylinder portion 38 is set to be substantially the same as the inclination angle of the inner surface of the fitting recess 68 of the vehicle body 60 described later, and the first taper cylinder portion 26. the inclination angle of relative axial: theta ₁ is an inclination angle with respect to the axial direction of the second tapered tube portion 38: is greater than theta _2.

  A second outer peripheral cylindrical portion 40 is provided at the outer peripheral end of the outer member 14. The second outer peripheral cylindrical portion 40 is formed integrally with the second tapered cylindrical portion 38 and extends downward from the outer peripheral end of the second tapered cylindrical portion 38.

  An inner flange portion 42 is provided at the inner peripheral end of the outer member 14. The inner flange portion 42 is formed integrally with the second taper cylinder portion 38 and protrudes from the inner circumference end of the second taper cylinder portion 38 to the inner circumference side in a direction substantially perpendicular to the axis over the entire circumference. Furthermore, the inner diameter of the inner flange portion 42 is made smaller than the outer diameter of the lower end protruding portion 30 of the inner member 12 and is substantially the same as the outer diameter of the first outer peripheral cylindrical portion 28 of the inner member 12. ing.

  As shown in FIG. 1, the inner member 12 and the outer member 14 are disposed on the same central axis and are elastically connected by a cylindrical rubber elastic body 16. The cylindrical rubber elastic body 16 as a whole has a thick and large diameter and has a substantially tapered cylindrical shape that gradually expands downward, and the inner member 12 is vulcanized and bonded to the inner peripheral portion, and the outer periphery The outer member 14 is vulcanized and bonded to the portion. The cylindrical rubber elastic body 16 is formed as an integrally vulcanized molded product including the inner member 12 and the outer member 14. In the cylindrical rubber elastic body 16, the end surface of the portion disposed between the inner peripheral end portions of the inner member 12 and the outer member 14 is referred to as “upper surface”, and the outer peripheral end portions of the inner member 12 and the outer member 14. An end surface extending in a direction substantially perpendicular to the axis between the two is called a “lower surface”.

  Further, an inner peripheral rubber layer 44 integrally formed with the cylindrical rubber elastic body 16 is deposited on the inner peripheral surface of the inner member 12, and the cylindrical rubber elasticity is formed on the outer peripheral surface of the outer member 14. An outer peripheral rubber layer 46 formed integrally with the body 16 is formed to adhere. As a result, the surfaces of the inner member 12 and the outer member 14 are substantially entirely covered with the rubber elastic bodies (the integrally formed cylindrical rubber elastic body 16, the inner peripheral rubber layer 44, and the outer peripheral rubber layer 46).

  Furthermore, in a single state before the damper mount 10 is mounted on the vehicle, the outer member 14 is disposed so as to be disengaged upward with respect to a mounting position of a bearing 66 (described later) with respect to the inner member 12. The mounting position of the bearing 66 (bearing contact surface 48 in FIG. 1) is defined by the surface of the inner peripheral rubber layer 44 covering the lower surface of the upper end of the mounting portion 32 of the inner member 12, and the outer member 14 is the bearing. The contact surface 48 is spaced upward in the axial direction.

Further, the cylindrical rubber elastic body 16 is formed with an inner peripheral straight portion 50. The inner circumferential straight portion 50 is an annular recess that opens axially upward on the upper surface of the cylindrical rubber elastic body 16 between the inner member 12 and the outer member 14 in the radial direction, and toward the opening side. It has a longitudinal cross-sectional shape that expands. Further, the inner peripheral straight portion 50 is an imaginary line: l ₁ that linearly connects the inner peripheral end of the inner member 12 and the inner peripheral end of the outer member 14 in the longitudinal section in a single state shown in FIG. Also, the deepest part reaches the upper end part of the attachment part 32 in the inner member 12.

Further, the cylindrical rubber elastic body 16 is formed with an outer peripheral straight portion 52. The outer peripheral straight portion 52 is formed on the outer peripheral side of the inner peripheral straight portion 50 between the radial directions of the inner member 12 and the outer member 14, and opens in the axial direction downward on the lower surface of the cylindrical rubber elastic body 16. And has a longitudinal cross-sectional shape that expands radially toward the opening side. Further, the outer peripheral straight portion 52 is above the imaginary line: l ₂ that linearly connects the outer peripheral end of the inner member 12 and the outer peripheral end of the outer member 14 in the vertical section of the single state shown in FIG. The innermost part is formed so as to enter, and the deepest part extends upward from the lower end of the outer member 14.

  The inner peripheral straight portion 50 is opened upward in the axial direction on the upper surface of the cylindrical rubber elastic body 16, and the outer peripheral straight portion 52 is opened downward in the axial direction on the lower surface of the cylindrical rubber elastic body 16. By doing so, as the mold for vulcanization molding of the cylindrical rubber elastic body 16, it is possible to adopt one that is divided into two vertically. Therefore, in the vulcanization molding process of the cylindrical rubber elastic body 16, the work space required in the direction perpendicular to the axis when assembling and removing the mold can be reduced, and productivity can be improved. .

Further, in the longitudinal section in a single state shown in FIG. 1, the deepest portion (lowest point) of the inner peripheral straight portion 50 and the deepest portion (highest point) of the outer peripheral straight portion 52 have substantially the same axial position. (In FIG. 1, an imaginary line extending in the direction perpendicular to the axis: on l ₃ ). Thus, when the inner member 12 and the outer member 14 are relatively displaced in the radial direction, the cylindrical rubber elastic body 16 is not narrowed between the inner member 12 and the outer member 14, and the cylindrical rubber elastic body. At 16, the shear deformation occurs predominantly.

The outer peripheral end of the inner member 12 in longitudinal section (lower end) and the inner peripheral end of the outer member 14 (the upper end) and a linearly connect virtual line: l on _4, is continuously cylindrical rubber elastic body 16 The outer peripheral end of the inner member 12 and the inner peripheral end of the outer member 14 are linearly connected by a cylindrical rubber elastic body 16. In particular, in the present embodiment, the cylindrical rubber elastic body 16 is continuously disposed in a region that linearly connects the inner flange portion 42 of the outer member 14 and the outer peripheral end of the inner member 12. The outer peripheral end is linearly elastically connected to the inner peripheral end of the outer member 14 with a certain width.

In addition, since the damper mount 10 exhibits a substantially constant vertical cross-sectional shape over the entire circumference, the above description regarding l ₁ to l ₄ is valid in a vertical cross-section at an arbitrary position on the circumference.

  In the damper mount 10 having such a structure, the spring perpendicular to the axis is sufficiently softer than the spring in the axial direction.

  That is, the cylindrical rubber elastic body 16 is formed with an inner peripheral straight portion 50 that opens upward in the axial direction and an outer peripheral straight portion 52 that opens downward in the axial direction on the outer peripheral side of the inner peripheral straight portion 50. Has been. Thereby, in the cylindrical rubber elastic body 16, the portion sandwiched in the direction perpendicular to the axis between the inner member 12 and the outer member 14 is reduced, and the cylindrical rubber elastic body 16 is sheared at the time of vibration input in the direction perpendicular to the axis. Deformation is dominant. As a result, at the time of vibration input in the direction perpendicular to the axis, the shear spring component of the cylindrical rubber elastic body 16 becomes dominant, and a sufficiently soft spring (low spring constant) is realized.

In addition, the inner peripheral straight portion 50 is formed to a depth reaching below the line: l ₁ that linearly connects the upper end of the inner member 12 and the upper end of the outer member 14, and the outer peripheral straight portion 52 is A line that linearly connects the lower end of the inner member 12 and the lower end of the outer member 14 is formed to a depth reaching to below the line l ₂ . As described above, in the single state before the vehicle is mounted, both the inner peripheral straight portion 50 and the outer peripheral straight portion 52 that open to the upper and lower end surfaces of the cylindrical rubber elastic body 16 enter between the inner member 12 and the outer member 14. It is out. Therefore, the cylindrical rubber elastic body 16 is prevented from being compressed in the direction perpendicular to the axis between the inner member 12 and the outer member 14, and a soft spring based on the shear spring component is realized.

Further, the deepest portion of the inner peripheral straight portion 50 and the deepest portion of the outer peripheral straight portion 52 have the same axial position (on l ₃ in FIG. 1). As a result, the cylindrical rubber elastic body 16 disposed in the region overlapping with both the inner member 12 and the outer member 14 in the direction perpendicular to the axis is formed on the inner peripheral portion and the outer peripheral portion by the inner peripheral straight portion 50 or the outer peripheral straight portion 52. It is divided. Therefore, at the time of vibration input in the direction perpendicular to the axis, the cylindrical rubber elastic body 16 mainly undergoes shear deformation, and a soft spring in the direction perpendicular to the axis can be obtained.

The inclination angle with respect to the axial direction of the second tapered tube portion 38: theta _2, along with being set according to the structure of the vehicle body 60 side, the inclination angle with respect to the axial direction of the first tapered tube portion 26: theta ₁ is The inclination angle of the second taper cylinder portion 38 is larger than θ ₂ . Therefore, when the vibration is input in the direction perpendicular to the axis, the shear deformation is more dominant in the cylindrical rubber elastic body 16 to realize a soft axis perpendicular direction spring. In the body 16, the compression deformation becomes more dominant, and the softening of the axial spring is suppressed.

  Further, the outer member 14 is disposed above a mounting position (bearing contact surface 48) of a bearing 66 (described later) with respect to the inner member 12, and is biased upward with respect to the inner member 12. The axial distance between the inner member 12 and the outer member 14 is increased. Accordingly, the rubber volume of the cylindrical rubber elastic body 16 disposed between the inner member 12 and the outer member 14 can be increased while the diameter of the outer member 14 is suppressed, thereby ensuring durability. As a result, a portion of the cylindrical rubber elastic body 16 that is compressed in the axial direction between the inner member 12 and the outer member 14 becomes large, and the axial spring is kept hard, so that the steering stability is improved. Is planned.

Further, a cylindrical rubber elastic body 16 is continuously disposed on a line l ₄ that linearly connects the outer peripheral end of the inner member 12 and the inner peripheral end of the outer member 14. Thereby, at the time of axial vibration input, compression deformation is dominant in the cylindrical rubber elastic body 16, and a hard spring (high spring constant) based on the compression spring component is realized.

  Moreover, an inner flange portion 42 extending in a direction perpendicular to the axis is formed at the inner peripheral end portion of the outer member 14, and a tubular shape is formed in a region connecting the inner flange portion 42 and the outer peripheral end portion of the inner member 12. A rubber elastic body 16 is continuously arranged. As a result, the cylindrical rubber elastic body 16 is compressed between the inner flange portion 42 and the inner member 12, so that compression deformation becomes more dominant in the cylindrical rubber elastic body 16 when an axial vibration is input. .

  In addition, the inner peripheral end portion of the inner flange portion 42 of the outer member 14 overlaps the lower end protruding portion 30 of the inner member 12 in the axial projection. Therefore, at the time of axial vibration input, the cylindrical rubber elastic body 16 is compressed between the inner flange portion 42 and the lower end protruding portion 30 to obtain a hard spring.

  As shown in FIG. 2, the damper mount 10 is attached to a connecting portion between the upper end portion of the strut 58 and the vehicle body 60. That is, the upper end portion of the strut 58 is inserted into the inner member 12 and fixed by the nut 62, and the bearing 66 attached to the shock absorber 64 of the strut 58 is fitted into the attachment portion 32 of the inner member 12 from below. Thus, the inner peripheral surface of the mounting portion 32 is overlapped with the inner peripheral rubber layer 44 interposed therebetween. On the other hand, the outer member 14 is fitted to a fitting recess 68 provided in the vehicle body 60 via an outer peripheral rubber layer 46. As a result, the strut 58 (shock absorber 64) is supported by the vehicle body 60 in a vibration-proof manner while being allowed to be twisted with respect to the vehicle body 60 (damper mount 10) by the bearing 66.

  A stopper member 70 is attached to a portion of the upper end portion of the strut 58 that protrudes upward from the inner member 12. The stopper member 70 has a structure in which a shock-absorbing rubber 74 protruding downward is bonded to the outer peripheral end of the stopper plate 72 by vulcanization, and the stopper plate 72 is fixed to the upper end of the strut 58. Yes. The outer peripheral end portion of the stopper plate 72 is disposed to be opposed to the upper bottom wall portion of the fitting recess 68 in the vehicle body 60 with a predetermined distance in the vertical direction, and the stopper plate 72 and the fitting recess. The rebound stopper means is configured to limit the distance between the inner member 12 and the outer member 14 in the axial direction by utilizing the contact of the upper and lower wall portions 68 with the buffer rubber 74.

  In such a vehicle-mounted state, the static load of the vehicle body 60 is exerted between the inner member 12 and the outer member 14 in the axial direction, so that the first tapered cylinder portion 26 of the inner member 12 and the second tapered cylinder of the outer member 14 The part 38 is displaced in the axial direction. Accordingly, the cylindrical rubber elastic body 16 that connects the inner member 12 and the outer member 14 is elastically deformed so as to bulge outward and downward between the outer peripheral ends of the inner member 12 and the outer member 14. The tubular rubber elastic body 16 is formed with a bulging portion 76 as shown in FIG. Therefore, when the axial vibration is input, a larger portion of the cylindrical rubber elastic body 16 that is compressed between the inner member 12 and the outer member 14 is secured, and an axially hard spring is advantageously realized. Therefore, improvement in handling stability and durability is realized.

  Further, in the damper mount 10, even after the deformation of the cylindrical rubber elastic body 16 due to the static load of the vehicle body 60, the inner peripheral straight portion 50 and the outer peripheral straight portion 52 are not completely crushed and each remains in a concave shape. The spring in the direction perpendicular to the axis is softened.

  FIG. 3 shows a damper mount 80 as a second embodiment of the present invention. In the damper mount 80, an inner peripheral straight portion 82 and an outer peripheral straight portion 84 are formed in the cylindrical rubber elastic body 16. In the following description, members and portions that are substantially the same as those of the first embodiment are denoted by the same reference numerals in the drawings, and the description thereof is omitted.

The inner peripheral straight portion 82 and the outer peripheral straight portion 84 are larger in depth than the inner peripheral straight portion 50 and the outer peripheral straight portion 52 shown in the first embodiment. The bottom portion of 82 and the bottom portion of the outer peripheral corner portion 84 overlap each other in the projection in the direction perpendicular to the axis. In other words, the axial position of the deepest portion of the inner peripheral straight portion 82 is on l _{5 in} FIG. 3, and the axial position of the deepest portion of the outer peripheral straight portion 84 is on l _{6 in} FIG. L ₅ is located below l ₆ .

  According to the damper mount 80 provided with such an inner peripheral straight portion 82 and an outer peripheral straight portion 84, the tubular rubber elastic body 16 can be disposed between the inner member 12 and the outer member 14 in the radial direction even after being mounted on the vehicle. The part to be compressed is reduced. Therefore, an excellent vibration isolation effect (vibration insulation effect) is exhibited by the soft spring based on the shear spring component when the vibration in the direction perpendicular to the axis such as road noise is input.

  As mentioned above, although embodiment of this invention was explained in full detail, this invention is not limited by the specific description. For example, in the first and second embodiments, each of the first taper cylinder part 26 and the second taper cylinder part 38 has a substantially flat plate shape, and the inclination angle is substantially constant throughout. However, as long as these first and second tapered tube portions are inclined with respect to the axial direction, for example, they may be curved in an arc shape or may be bent in a polygonal shape. In short, the inclination angles of the first and second tapered tube portions may change continuously or stepwise. In addition, when the inclination angles of the first and second tapered cylinder portions are changed as described above, the average value of the inclination angles is set as the inclination angle of the first and second tapered cylinder portions.

  Moreover, the specific longitudinal cross-sectional shape of an inner peripheral curving part and an outer peripheral curving part is not specifically limited, What is necessary is just to open to the upper and lower surfaces of a cylindrical rubber elastic body. Further, the positional relationship and the dimensional relationship between the inner peripheral corner portion and the outer peripheral corner portion are limitedly interpreted according to the specific description of the embodiment as long as the outer peripheral corner portion is on the outer peripheral side of the inner peripheral corner portion. Should not be done.

  In the above-described embodiment, the mounting position of the bearing 66 is specified by the bearing contact surface 48. However, the outer member 14 only needs to be disposed above the axial position where the bearing 66 is to be mounted. Thus, the mounting portion 32 of the inner member 12 is not essential, and the bearing contact surface 48 may be omitted.

10, 80: damper mount, 12: inner member, 14: outer member, 16: cylindrical rubber elastic body, 26: first taper cylinder, 38: second taper cylinder, 42: inner flange, 48: bearing Contact surface (bearing mounting position), 50, 82: Inner peripheral curb, 52, 84: Outer peripheral curb, 60: Vehicle body, 64: Shock absorber, 66: Bearing

Claims (5)

In a damper mount having an inner member attached to a shock absorber via a bearing, and an outer member that is spaced apart from the outer peripheral side of the inner member and attached to the vehicle body are elastically connected by a cylindrical rubber elastic body.
While the outer member is disposed above the mounting position of the bearing with respect to the inner member,
Between the inner member and the outer member, an inner peripheral straight portion that opens upward in the axial direction is formed on the upper surface of the cylindrical rubber elastic body, and on the outer peripheral side from the inner peripheral straight portion. An outer peripheral straight portion that opens downward in the axial direction is formed on the lower surface of the cylindrical rubber elastic body , and
The inner member has a first taper cylinder part inclined downward toward the outer peripheral side, and the outer member has a second taper cylinder part inclined downward toward the outer periphery side, the first taper cylinder part The damper mount is characterized in that an inclination angle with respect to the axial direction: [theta] ₁ is larger than an inclination angle with respect to the axial direction of the second taper cylindrical portion: [theta] ₂ .   The inner member has a first tapered tube portion that is inclined downward toward the outer peripheral side, and the outer member has a second tapered tube portion that is inclined downward toward the outer peripheral side, and the outer peripheral end of the inner member The damper mount according to claim 1, wherein the cylindrical rubber elastic body is continuously disposed on a line that linearly connects the portion and the inner peripheral end of the outer member.   An inner flange portion is provided at an inner peripheral end portion of the outer member, and the cylindrical rubber elastic body is continuously disposed on a region that linearly connects the inner flange portion and the outer peripheral end portion of the inner member. The damper mount according to claim 2 provided.   The damper mount according to any one of claims 1 to 3, wherein the deepest portion of the inner peripheral straight portion and the deepest portion of the outer peripheral straight portion have the same axial position.   The damper mount according to any one of claims 1 to 3, wherein a bottom portion of the inner peripheral straight portion and a bottom portion of the outer peripheral straight portion overlap each other in projection in a direction perpendicular to the axis.

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