JP2011148442A - Suspension bush and suspension device using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a suspension bush capable of controlling toe change while suppressing increase in the number of parts and in the size of a suspension device. <P>SOLUTION: In a cross section 200 of an elastic body 43 of the suspension bush 40 which passes through an axial line X of an inner cylinder 41, a first notch 60 is formed at the inside front in a vehicle width direction with the inner cylinder 41 interposed therebetween; a second notch 64 is formed at the inside rear in the vehicle width direction; a third notch 80 is formed at the outside front in the vehicle width direction; and a fourth notch 84 is formed at the outside back in the vehicle width direction. In the first notch 60, the inclination of a first line 62 with respect to the axial line X is larger than that of a second line 63. In the second notch 64, the inclination of a fourth axial line 67 with respect to the axial line X is larger than that of a third line 66. In the third notch 80, the inclination of a sixth line 83 with respect to the axial line X is larger than that of a fifth line 82. In the fourth notch 84, the inclination of a seventh line 86 with respect to the axial line X is larger than that of an eighth line 87. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a technique of a suspension bush used in, for example, an automobile suspension device. Moreover, it is related with the technique of a suspension apparatus provided with this suspension bush.

  2. Description of the Related Art Conventionally, in an automobile, the rear wheel toe change is controlled during braking so that the running of the automobile is stabilized. As this type of technology, a toe control arm is added to the suspension device, and the rear wheel toe change is controlled to tilt inward (inward in the vehicle width direction) during braking.

  As another technique, there is a technique that utilizes the fact that a load toward the rear of the vehicle body acts on the rear suspension device during braking. In this type of technology, there is a technique in which a posture of a suspension bush used for connection between a trailing arm provided in a suspension device and a vehicle body, for example, a side member is devised. Specifically, the suspension bush is disposed so that the axial direction of the inner cylinder of the suspension bush is inclined with respect to the vehicle width direction.

  As the suspension bushing is disposed obliquely as described above, the rear wheel toe is displaced inward.

  However, in the structure including the toe control arm, the number of parts of the suspension device increases, and therefore the cost of the suspension device tends to increase. It is not preferable that the number of parts of the suspension device increases.

  Further, in the structure in which the suspension bush is disposed obliquely, a twisting force acts on the suspension bush during braking. For this reason, the elastic body of the suspension bush needs to be formed large in order to reduce the spring constant in the direction in which the twisting force acts, absorb the twisting force, and increase the durability. Furthermore, the structure of the bracket used when attaching the suspension bush to the vehicle body such as a side member becomes complicated. It is not preferable that the suspension bush becomes large or the bracket structure is complicated.

  On the other hand, a technique for controlling the toe change by devising the structure of the elastic body of the suspension bush has been proposed. In this type of technology, an intermediate ring is provided in an elastic body accommodated between the inner cylinder and the outer cylinder of the suspension bush. The intermediate ring regulates the displacement of the elastic body due to the load acting in the axial direction of the suspension bush, and the elastic body is displaced in the direction perpendicular to the axis (see, for example, Patent Document 1).

Japanese Patent No. 4021243

  However, the technique disclosed in Patent Document 1 is a technique for converting the displacement of the elastic body caused by the load acting in the axial direction of the suspension bushing into the displacement in the direction perpendicular to the axis. In other words, it is not a technique for controlling the rear wheel toe change caused by the load toward the rear of the vehicle body acting on the suspension bush during braking of the automobile.

  Furthermore, in the technique disclosed in Patent Document 1, the number of parts increases because an intermediate ring is used. An increase in the number of parts is not preferable.

  An object of the present invention is to provide a suspension bush that can control a change in toe while suppressing an increase in the number of components and an increase in size of the suspension device. Another object of the present invention is to provide a suspension device including the suspension bush.

  A suspension bush according to a first aspect of the present invention is a suspension bush provided at a connecting portion between a trailing arm and a vehicle body, and includes an inner cylinder, an outer cylinder accommodating the inner cylinder inside, An elastic body is provided between the cylinder and the outer cylinder and is fixed to the inner cylinder and the outer cylinder and elastically deformable.

  The elastic body is provided at one end with the inner cylinder sandwiched between the first groove and opened at one end face, and the one end with the inner cylinder sandwiched between the one end face and the one end face. A second groove portion that opens to the other end portion, a third groove portion that is provided on the one side with the inner cylinder sandwiched at the other end portion and opens to the other end surface, and the other tube portion that sandwiches the inner cylinder portion with the other end portion. And a fourth groove opening at the other end surface. In a predetermined cross section of the elastic body passing through the axis and parallel to the axis, the one end is a cross section of the first groove portion on the one side with the inner cylinder in between. A triangular first notch that opens to one end surface, and a triangular second that is a cross section of the second groove and opens to the one end surface on the other side across the inner cylinder at the one end. A notch, a triangular third notch that is a cross-section of the third groove and opens to the other end surface, on the one side across the inner cylinder at the other end of the elastic body, and the other A triangular fourth notch that is a cross-section of the fourth groove and opens to the other end surface is formed on the other side of the inner cylinder at the end. Of the lines defining the first notch, the outer cylinder side line is the first line, the inner cylinder side line is the second line, and the first cylindrical axis line of the inner cylinder is the first line. The degree of inclination of the line is made larger than the degree of inclination of the second line with respect to the axial line. Of the lines defining the second notch, the outer cylinder side line is the third line, the inner cylinder side line is the fourth line, and the fourth axial line with respect to the axial center line. The inclination of the third line is made larger than the inclination of the third line with respect to the axis. Of the lines defining the third notch, the outer cylinder side line is the fifth line, the inner cylinder side line is the sixth line, and the sixth cylinder axis line of the inner cylinder is the sixth line. The degree of inclination of the line is set to be greater than the degree of inclination of the fifth line with respect to the axial line. Of the lines defining the fourth notch, the outer cylinder side line is the seventh line, the inner cylinder side line is the eighth line, and the seventh cylinder axis line of the inner cylinder is the seventh line. The degree of inclination of the line is made larger than the degree of inclination of the eighth line with respect to the axial center line.

  The suspension bush configured as described above has a predetermined cross-section as a plane defined by the longitudinal direction of the vehicle body and the vehicle width direction, the first and third cutouts are arranged on the front side of the vehicle body, and the second and fourth cutouts are located on the rear side of the vehicle body. By positioning the inner cylinder on the vehicle body side and fixing the outer cylinder on the trailing arm side, the outer cylinder is positioned relative to the inner cylinder relative to the inner cylinder due to the load generated during braking of the vehicle. As a result, the portion of the elastic body disposed on the front side of the vehicle body is compressed, and the portion disposed on the rear side of the vehicle body extends rearward of the vehicle body. When the elastic body is displaced as described above, the outer cylinder is displaced inward in the vehicle width direction with respect to the inner cylinder. For this reason, the toe of the wheel supported by the trailing arm is changed to the in side.

  Further, even when the inner cylinder is fixed to the trailing arm side and the outer cylinder is fixed to the vehicle body side, when the inner cylinder is displaced relative to the outer cylinder relative to the outer cylinder due to a load generated during braking of the vehicle, A portion of the elastic body disposed on the rear side of the vehicle body is compressed, and a portion disposed on the front side of the vehicle body extends rearward of the vehicle body. When the elastic body is displaced as described above, the inner cylinder is displaced inward in the vehicle width direction with respect to the outer cylinder. For this reason, the toe of the wheel supported by the trailing arm is changed to the in side.

  A suspension device according to a second aspect of the present invention is a suspension device that supports a wheel on a vehicle body, and includes a trailing arm and a suspension bush that supports the trailing arm on the vehicle body. The suspension bush is provided between the inner cylinder and the outer cylinder, an inner cylinder fixed to the vehicle body side, an outer cylinder fixed to the trailing arm side and housing the inner cylinder on the inside. And an elastic body fixed to the inner cylinder and the outer cylinder and elastically deformable. The suspension bush is attached to the vehicle body in such a posture that the axial center line of the inner cylinder is parallel to the vehicle width direction.

  In a state where the suspension bush is attached to the vehicle body, the elastic body includes a first groove portion provided on the vehicle body front side across the inner cylinder at the vehicle width direction inner end portion and opening on the vehicle width direction inner end surface. A second groove portion provided on the rear side of the vehicle body with the inner cylinder at the inner end in the vehicle width direction and opened to the inner end surface in the vehicle width direction, and the inner cylinder at the outer end in the vehicle width direction. A third groove provided on the front side of the vehicle body and opening to the outer end surface in the vehicle width direction; and an outer end surface in the vehicle width direction provided on the rear side of the vehicle body with the inner cylinder sandwiched at the outer end portion in the vehicle width direction. And a fourth groove portion that is open to the surface.

  In a state where the suspension bush is attached to the vehicle body, the vehicle width is within a predetermined cross section of the elastic body that passes through the axis of the inner cylinder, is parallel to the axis, and extends in the vehicle longitudinal direction. A triangular first notch that is a cross-section of the first groove and opens to the inner end surface in the vehicle width direction on the vehicle body front side across the inner cylinder at the inner end in the direction, and the inner end in the vehicle width direction At the rear side of the vehicle body across the inner cylinder, at a second notch that is a cross-section of the second groove and opens to the inner end surface in the vehicle width direction, and an outer end portion in the vehicle width direction A triangular third notch that is a cross section of the third groove and opens to the outer end surface in the vehicle width direction on the front side of the vehicle body across the inner tube, and the inner cylinder at the outer end portion in the vehicle width direction A cross section of the fourth groove on the rear side of the vehicle body A fourth cutout triangular opening to the vehicle width direction outer end face is formed by a.

  Of the lines defining the first notch, the outer cylinder side line is the first line, the inner cylinder side line is the second line, and the first cylindrical axis line of the inner cylinder is the first line. The degree of inclination of the line is made larger than the degree of inclination of the second line with respect to the axial line. Of the lines defining the second notch, the outer cylinder side line is the third line, the inner cylinder side line is the fourth line, and the fourth axial line with respect to the axial center line. The inclination of the third line is made larger than the inclination of the third line with respect to the axis. Of the lines defining the third notch, the outer cylinder side line is the fifth line, the inner cylinder side line is the sixth line, and the sixth cylinder axis line of the inner cylinder is the sixth line. The degree of inclination of the line is set to be greater than the degree of inclination of the fifth line with respect to the axial line. Of the lines defining the fourth notch, the outer cylinder side line is the seventh line, the inner cylinder side line is the eighth line, and the seventh cylinder axis line of the inner cylinder is the seventh line. The degree of inclination of the line is made larger than the degree of inclination of the eighth line with respect to the axial center line.

  According to the present invention, the toe change can be controlled while suppressing an increase in the number of parts of the suspension device and an increase in the size of the suspension bush.

BRIEF DESCRIPTION OF THE DRAWINGS Schematic which shows a motor vehicle provided with the suspension apparatus which concerns on the 1st Embodiment of this invention. The side view which shows the state which looked at the motor vehicle along the arrow F2 shown in FIG. Sectional drawing of a part of trailing arm and suspension bush shown along the F3-F3 line shown in FIG. The front view which shows the state which looked at the suspension bush shown by FIG. 3 from the arrow F4 direction shown by the figure. Sectional drawing which shows the state which the load at the time of braking acted on the suspension bush shown by FIG. FIG. 2 is a schematic diagram schematically showing a first suspension device that couples a rear wheel arranged on the left side of the vehicle body shown in FIG. 1 to the vehicle body. Sectional drawing which shows the state which cut the suspension apparatus which concerns on the 2nd Embodiment of this invention by the virtual plane prescribed | regulated by the vehicle body front-back direction and a vehicle width direction in the state attached to the vehicle body. Sectional drawing which shows the state which the load at the time of braking acted on the suspension bush shown by FIG.

  A suspension device according to a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a schematic view showing an automobile 10 provided with the suspension device of the present embodiment. The automobile 10 is an example of a vehicle referred to in the present invention. As shown in FIG. 1, the automobile 10 includes a pair of front wheels 11 and a pair of rear wheels 12.

  In the vehicle body 13, the front side in the forward direction is the front portion 14, the opposite side to the front side is the rear portion 15, and the vehicle body longitudinal direction A is assumed. A driver seat and a passenger seat (not shown) are arranged in the front portion 14. The front wheel 11 is disposed on the front portion 14. The rear wheel 12 is disposed in the rear portion 15. The vehicle width direction B is orthogonal to the vehicle body longitudinal direction A. The vehicle body vertical direction C is a direction orthogonal to a plane having the vehicle longitudinal direction A and the vehicle width direction B as axes.

  Each front wheel 11 is supported on the vehicle body 13 by a front wheel suspension device (not shown). Of the pair of rear wheels 12, the rear wheel 12 on the left side of the vehicle body is supported by the vehicle body 13 by the first suspension device 30. The rear wheel 12 on the right side of the vehicle body is supported by the vehicle body 13 by the second suspension device 100.

  The first and second suspension devices 30 and 100 are trailing arm type suspension devices, and are examples of the suspension device referred to in the present invention. The structure of the second suspension device 100 may be the same as the structure of the first suspension device 30. Therefore, the first suspension device 30 will be described as a representative, and the description of the second suspension device 100 will be omitted.

  The first suspension device 30 includes a trailing arm 31, a suspension bush 40 provided between the trailing arm 31 and the vehicle body 13 and supporting the trailing arm 31 on the vehicle body, an arm 33, and the like.

  The trailing end 31 a of the trailing arm 31 is fixed to the hub carrier 16 of the rear wheel 12. The front end portion 31 b of the trailing arm 31 is connected to the vehicle body 13 via the suspension bush 40 and the bracket 34. In the present embodiment, the front end portion 31 b is supported by the side member 17 as an example of the vehicle body 13. One side member 17 is disposed at each end of the vehicle body 13 in the vehicle width direction, and extends in the vehicle body longitudinal direction A. In FIG. 1, only a part of both side members 17 is shown, and the other parts are omitted.

  FIG. 2 is a side view showing a state in which the automobile 10 is viewed along the arrow F2 shown in FIG. FIG. 2 shows the rear wheel 12 by a two-dot chain line and also shows a connecting portion between the trailing arm 31 and the side member 17 of the first suspension device 30. FIG. 3 is a cross-sectional view of part of the trailing arm 31 and the suspension bush 40 taken along the line F3-F3 shown in FIG. FIG. 3 shows a state in which the suspension bush 40 passes through the axial center line X of the inner cylinder 41 to be described later, is parallel to the axial center line X, and is cut in a virtual plane in the longitudinal direction A of the vehicle body. Yes.

  As shown in FIG. 1, one end 33 a of the arm 33 is connected to the hub carrier 16 of the rear wheel 12. The other end 33b of the arm 33 is connected to the vehicle body 13, and is connected to, for example, a cross member (not shown).

  As shown in FIG. 3, the suspension bush 40 includes an inner cylinder 41, an outer cylinder 42, and an elastic body 43. The inner cylinder 41 is a cylinder made of, for example, metal and open at both ends. The inner cylinder 41 is fastened and fixed to a bracket 34 partially shown in FIGS. 2 and 3 by bolts 35 and nuts 36. Specifically, the bracket 34 has a shape for sandwiching the inner cylinder 41 from both ends, and is fastened to the sandwiched portion by bolts 35 and nuts 36. As shown in FIG. 2, the bracket 34 is fixed by welding, for example, inside a side member 17 that is an example of a portion fixed in the vehicle body 13. The bracket 34 is formed so as not to disturb the deformation of the elastic body 34.

  Thus, the inner cylinder 41 is fixed to the vehicle body 13 by the bracket 34, the bolt 35, and the nut 36. This fixing is an example of fixing to the vehicle body side in the present invention. For this reason, the inner cylinder 41 is not displaced in the vehicle width direction B with respect to the vehicle body 13.

  The fixing to the vehicle body side is a concept including fixing directly to the vehicle body and indirectly fixing to the vehicle body via the bracket 34 or the like as in the present embodiment. For this reason, the inner cylinder 41 may be directly fixed to the vehicle body 13 such as the side member 17 without using the bracket 34.

  The outer cylinder 42 is a cylinder made of, for example, metal and open at both ends. The outer cylinder 42 accommodates the inner cylinder 41 inside. The outer cylinder 42 is fixed to the front end portion 31 b of the trailing arm 31. As an example of this fixing structure, as shown in FIG. 3, the front end portion 31b is formed with a fitting hole 37 for fitting the outer tube 42 inward and fixing the outer tube 42 to the front end portion 31b. The outer cylinder 42 is fixed to the trailing arm 31 by fitting and fixing the outer cylinder 42 in the fitting hole 37. This is an example of fixing to the trailing arm side referred to in the present invention. The outer cylinder 42 is not displaced in the vehicle width direction B relative to the trailing arm 31.

  In the present invention, to be fixed to the trailing arm side means to be fixed directly to the trailing arm as in this embodiment, or indirectly to the trailing arm using a bracket or the like. It is a concept that includes For this reason, the outer cylinder 42 may be fixed to the trailing arm 31 via a bracket (not shown), for example.

  The elastic body 43 is elastically deformable and is, for example, rubber, and is provided between the inner cylinder 41 and the outer cylinder 42. The inner cylinder 41 and the outer cylinder 42 are arranged so that their axial lines X and Y overlap each other. In other words, the elastic body 43 is provided in a cylindrical shape so that the axis X of the inner cylinder 41 and the axis Y of the outer cylinder 42 overlap. The axis Z of the elastic body 43 overlaps the axes X and Y. The inner cylinder 41, the outer cylinder 42, and the elastic body 43 are arranged so as to be coaxial, the inner cylinder 41 is fitted inside the elastic body 43, and the elastic body 43 is fitted inside the outer cylinder 42. waiting.

  The elastic body 43 has an outer surface in contact with the entire inner surface of the outer cylinder 42, an inner surface is in contact with the entire outer surface of the inner cylinder 41, and is fixed to the inner cylinder 41 and the outer cylinder 42. For example, the entire outer surface of the inner cylinder 41 and the entire inner surface of the elastic body 43, the entire inner surface of the outer cylinder 42, and the entire outer surface of the elastic body 43 are fixed by an adhesive. The elastic body 43 can be elastically deformed between the inner cylinder 41 and the outer cylinder 42. When the outer cylinder 42 changes relative to the inner cylinder 41 or when the inner cylinder 41 changes relative to the outer cylinder 42, the elastic body 43 is elastically deformed between the inner cylinder 41 and the outer cylinder 42. To do.

  FIG. 4 is a front view showing a state in which the suspension bush 40 is viewed from the direction of arrow F4 shown in FIG. In FIG. 4, the suspension bush 40 is viewed from the one end 40 a side along the axis X of the inner cylinder 41. The one end portion 40 a is an end portion that faces inward in the vehicle width direction when the suspension bush 40 is attached to the vehicle body 13. In FIG. 4, the bolt 35, the nut 36, the bracket 34, and the front end portion 31 b of the trailing arm 31 are omitted.

  As shown in FIGS. 3 and 4, a first groove 44 is formed in one end 43 a of the elastic body 43. The first groove 44 has a concave shape that opens to the one end face 45. The first groove 44 is formed in an annular shape that goes around the axis X. In FIG. 4, the first groove 44 is hatched. This hatching is used to make the first groove 44 easy to understand, and does not indicate a cross section. A second groove 46 is formed in the other end 43 b of the elastic body 43. The second groove 46 has a concave shape that opens to the other end surface 47. The second groove 46 is formed in an annular shape that goes around the axis X of the inner cylinder 41. The other end portion 43b is an end portion facing outward in the vehicle width direction when the suspension bush 40 is attached to the vehicle body 13. A cross section 200 of the suspension bush 40 shown in FIG. 3 is an example of a predetermined cross section referred to in the present invention.

  First, the first groove 44 will be described. FIG. 4 shows a posture in a state where the suspension bush 40 is attached to the vehicle body 13. The inner edge 44a of the first groove 44 is circular, and the axial center line of the inner edge 44a overlaps the axial center line X of the inner cylinder 41, that is, is coaxial. The outer edge 44b of the first groove 44 is circular, and the axis of the outer edge 44b overlaps the axis X of the inner cylinder 41, that is, is coaxial.

  As shown in FIG. 4, the first groove 44 is divided into two parts. The first portion 50, which is one of the two portions, is a front portion of the vehicle body when the suspension bush 40 is attached to the vehicle body 13. The 1st part 50 is an example of the 1st groove part said by this invention. The other second portion 51 is a rear portion of the vehicle body. The 2nd part 51 is an example of the 2nd groove part said by this invention. In FIG. 4, the first and second portions 50 and 51 are differently hatched. The first and second portions 50 and 51 communicate with each other.

  In the present embodiment, as an example, the first portion 50 is a portion on the front side of the vehicle body, with a virtual line V passing through the axial line X of the inner cylinder 41 being parallel to the vehicle body vertical direction C. The second portion 51 is, for example, a portion on the rear side of the vehicle body with the virtual line V as a boundary. The imaginary line V is indicated by a two-dot chain line in the figure.

  First, the first portion 50 will be described. When the first portion 50 is viewed along the axial direction of the inner cylinder 41, the first portion 50 is formed in a semicircular shape having a constant width W around the axial line X in the radial direction.

  The cross-sectional shape of the first portion 50 when the elastic body 43 is cut in a plane passing through the axis X of the inner cylinder 41 and parallel to the axis X is a triangular shape. FIG. 3 is a cross-section passing through the axis X of the inner cylinder 41 and parallel to the axis X. A cross section of the first portion 50 as described above is referred to as a first notch 60. FIG. 3 shows the first notch 60. FIG. 3 is an example of a predetermined cross section referred to in the present invention. A cross section passing through the axis X and parallel to the axis X in the first portion 50 becomes the first notch 60 shown in FIG. 3 and has the same shape.

  As shown in FIG. 3, the portion on the outer tube 42 side of the line 61 defining the first notch 60 is defined as a first line 62. A portion of the line 61 on the inner cylinder 41 side is a second line 63. In the present embodiment, the first and second lines 62 and 63 are straight lines.

  When the inclination angle of the first line 62 with respect to the axis X of the inner cylinder 41 is α1, and the inclination angle of the second line 63 with respect to the axis X is β1, the first notch 60 has α1> β1. It becomes. In other words, the first portion 50 is formed to satisfy α1> β1.

  In the present embodiment, the second line 63 is formed in parallel with the axial line X of the inner cylinder 41. Therefore, in the present embodiment, β1 is 0 (zero), and the angle defined between the first and second lines 62 and 63 in the first notch 60 is α1.

  Next, the second portion 51 will be described. As shown in FIG. 4, when the second portion 51 is viewed in the axial direction of the inner cylinder 41, it has a semicircular shape with a constant width W in the radial direction around the axial line X of the inner cylinder 41. Is formed. The widths of the first and second portions 50 and 51 are the same value. The inner edge of the first portion 50 and the inner edge of the second portion 51 are continuous in a circular shape, and the outer edge of the first portion 50 and the outer edge of the second portion 51 are continuous in a circular shape.

  The cross-sectional shape of the second portion 51 when the elastic body 43 is cut in a plane passing through the axis X of the inner cylinder 41 and parallel to the axis X is a triangular shape. A cross section of the second portion 51 as described above is referred to as a second notch 64. FIG. 3 shows the second notch 64. A cross section passing through the axis X and parallel to the axis X in the second portion 51 becomes the second notch 64 shown in FIG. 3 and has the same shape.

  Of the line 65 defining the second notch 64, the portion on the outer cylinder 42 side is defined as a third line 66. A portion of the line 65 on the inner cylinder 41 side is a fourth line 67. In the present embodiment, the third and fourth lines 66 and 67 are straight lines.

  When the inclination angle of the third line 66 with respect to the axis X of the inner cylinder 41 is α2, and the inclination angle of the fourth line 67 with respect to the axis X is β2, the second notch 64 has β2> α2 It becomes. In other words, the second portion 51 is formed so that β2> α2.

  In the present embodiment, the third line 66 is formed in parallel with the axial line X of the inner cylinder 41. Therefore, in this embodiment, α2 is 0 (zero), and the angle defined between the third and fourth lines 66 and 67 in the second notch 64 is β2. In the present embodiment, α1 = β2.

  In the first groove 44, the intersection C <b> 1 of the first and second lines 62 and 63, which is the lower end point of the first notch 60, and the third and fourth lines 66, which are the lower end points of the second notch 64, The intersection C2 of 67 is located at the same depth in the direction of the axis X of the inner cylinder 41. In other words, the intersection points C1 and C2 overlap in a direction orthogonal to the axis X.

  Next, the second groove 46 will be described. The inner edge 46a of the second groove 46 is circular, and the axial center line of the inner edge 46a overlaps the axial center line X of the inner cylinder 41, that is, is coaxial. The outer edge 46b of the second groove 46 is circular, and the axis of the outer edge 46b overlaps the axis X of the inner cylinder 41, that is, is coaxial. The length from the axis X to the inner edge 44 a of the first groove 44 is the same as the length from the axis X to the inner edge 46 a of the second groove 46. The length from the axis X to the outer edge 44b of the first groove 44 is the same as the length from the axis X to the outer edge 46b of the second groove 46. In other words, when the elastic body is viewed in the direction of the axis X of the inner cylinder 41, the first and second grooves 44 and 46 overlap, the inner edges 44a and 46a overlap, and the outer edges 44b and 46b overlap.

  The second groove 46 is divided into two parts, and includes one third part 70 and the other fourth part 71. The third portion 70 is a portion corresponding to the front side of the vehicle body when the suspension bush 40 is attached to the vehicle body 13. The 3rd part 70 is an example of the 3rd groove part said by this invention. The fourth portion 71 is a portion corresponding to the rear side of the vehicle body. The 4th part 71 is an example of the 4th groove part said by this invention. In the present embodiment, the third portion 70 is, for example, a portion on the front side of the vehicle body with the virtual line V as a boundary. For example, the fourth portion 71 is a portion on the rear side of the vehicle body with the virtual line V as a boundary.

  The external shape of the second groove 46, that is, the shape viewed along the axial line X of the inner cylinder 41 is the same as that of the first groove 44 shown in FIG.

  First, the third portion 70 will be described. When the third portion 70 is viewed along the axial line direction of the inner cylinder 41, it is formed in a semicircular shape having a constant width W1 in the radial direction around the axial line X of the inner cylinder 41. The cross-sectional shape of the third portion 70 in the case where the elastic body 43 is cross-sectioned along a plane passing through the axis X of the inner cylinder 41 and parallel to the axis X is a triangular shape. FIG. 3 is a cross section passing through the axis X of the inner cylinder 41 and parallel to the axis X. A cross section of the third portion 70 as described above is referred to as a third notch 80. FIG. 3 shows a third notch 80. A cross section passing through the axis X and parallel to the axis X in the third portion 70 becomes the third notch 80 shown in FIG. 3 and has the same shape.

  Of the line 81 defining the third notch 80, the portion on the outer cylinder 42 side is defined as a fifth line 82. A portion of the line 81 on the inner cylinder 41 side is a sixth line 83. In the present embodiment, the fifth and sixth lines 82 and 83 are straight lines.

  When the inclination angle of the fifth line 82 with respect to the axis X of the inner cylinder 41 is α3, and the inclination angle of the sixth line 83 with respect to the axis X is β3, the third notch 80 has β3> α3 It becomes. In other words, the third portion 70 is formed so that β3> α3. In the present embodiment, the fifth line 82 is formed in parallel with the axial line X of the inner cylinder 41. Therefore, in the present embodiment, α3 is 0 (zero), and the angle defined between the fifth and sixth lines 82 and 83 in the third notch 80 is β3.

  Next, the fourth portion 71 will be described. When the fourth portion 71 is viewed along the axial line direction of the inner cylinder 41, the fourth part 71 is formed in a semicircular shape having a constant width W1 in the radial direction around the axial line X of the inner cylinder 41. The widths of the third and fourth portions 70 and 71 are the same.

  The cross-sectional shape of the fourth portion 71 when the elastic body 43 is cut in a plane that passes through the axis X of the inner cylinder 41 and is parallel to the axis X is a triangular shape. FIG. 3 is a cross section passing through the axis X of the inner cylinder 41 and parallel to the axis X. A cross section of the fourth portion 71 as described above is referred to as a fourth notch 84. A cross section passing through the axis X and parallel to the axis X in the fourth portion 71 becomes the fourth notch 84 shown in FIG. 3 and has the same shape.

  Of the line 85 that defines the fourth notch 84, a portion on the outer cylinder 42 side is defined as a seventh line 86. A portion of the line 85 on the inner cylinder 41 side is defined as an eighth line 87. In the present embodiment, the seventh and eighth lines 86 and 87 are straight lines.

  As shown in FIG. 3, when the inclination angle of the seventh line 86 with respect to the axis X of the inner cylinder 41 is α4 and the inclination angle of the eighth line 87 with respect to the axis X is β4, The notch 84 satisfies α4> β4. In other words, the fourth portion 71 is formed so as to satisfy α4> β4.

  In the present embodiment, the eighth line 87 is formed in parallel with the axial line X of the inner cylinder 41. For this reason, in this embodiment, β4 is 0 (zero), and the angle defined between the seventh and eighth lines 86 and 87 in the fourth notch 84 is α4. In the present embodiment, β3 = α4. As an example, α1 = β2 = β3 = α4. Therefore, the first line 62, the fourth line 67, the sixth line 83, and the seventh line 86 are parallel.

  In the second groove 46, the intersection C3 of the fifth and sixth lines 82 and 83, which is the lower end point of the third notch 80, and the seventh and eighth lines 86, which are the lower end points of the fourth notch 84, The intersection point C4 of 87 is located at the same depth in the axial direction of the inner cylinder 41. In other words, the intersection points C3 and C4 overlap in a direction orthogonal to the axis X. In the present embodiment, the intersections C1 to C4 have the same depth.

  In the present embodiment, the first portion 50 and the fourth portion 71 have the same structure, and the first notch 60 and the fourth notch 84 have the same shape. The second portion 51 and the third portion 70 have the same structure, and the second notch 64 and the third notch 80 have the same shape.

  A pair of through holes 90 and 91 is formed in the elastic body 43. As shown in FIG. 4, the through holes 90 and 91 are formed symmetrically across the inner cylinder 41. Each through hole 90, 91 extends along the axis X of the inner cylinder 41 and penetrates the elastic body 43. Each of the through holes 90 and 91 extends over the first and second portions 50 and 51, and extends over the third and fourth portions 70 and 71. The through holes 90 and 91 are opened outward from both end surfaces of the elastic body 43. A through-hole is an example and does not need to be.

  Next, a structure for fixing the suspension bush 40 to the vehicle body 13 will be described. As described above, the suspension bush 40 is fixed to the side member 17, which is an example of the vehicle body 13, with the inner cylinder 41 via the bracket 34. As shown in FIGS. 3 and 4, the suspension bush 40 is fixed to the vehicle body 13 such that the phantom line V is parallel to the vehicle body vertical direction C, and the first and third portions 50 and 70 are on the vehicle body front side. The second and fourth portions 51 and 71 are arranged so as to face the rear side of the vehicle body.

  In the present embodiment, the axial center line X of the inner cylinder 41 is disposed in parallel to the vehicle width direction B. The axial center line X of the inner cylinder 41 is not limited to being arranged strictly parallel to the vehicle width direction B. For example, the axial center line X may be substantially parallel (close to parallel) in the vehicle width direction B. In short, the first and third portions 50 and 70 face the front side of the vehicle body, and the second and fourth portions. What is necessary is just to arrange | position so that 51,71 may face the vehicle body rear side. Preferably, the axial center line X of the inner cylinder 41 is arranged parallel to the vehicle width direction B. Since the bolt 35 is parallel to the vehicle width direction B, the trailing arm 31 can be rotated around the bolt 35.

  In the above description, the first suspension device 30 has been described. However, the structure of the second suspension device 100 may be the same as that of the first suspension device 30. More specifically, the structure of the second suspension device 100 is separated from the structure of the first suspension device 30 by a second imaginary line V2 along the vehicle longitudinal direction A at the center in the vehicle width direction B. It is a symmetrical structure. In FIG. 1, the second virtual line V2 is indicated by a two-dot chain line. The second imaginary line V2 is not a line actually provided on the vehicle body 13, but a line used to indicate that the second suspension device 100 has a symmetrical structure.

  Next, the operation of the first and second suspension devices 30 and 100 will be described. Since the operation of the second suspension device 100 is the same as that of the first suspension device 30, the operation of the first suspension device 30 will be described as a representative.

  If the driver steps on the brake pedal while the automobile 10 is traveling forward, the rear wheels 12 are locked. As a result, the vehicle body 13 is displaced forward relative to the rear wheel 12. For this reason, the trailing arm 31 is pulled backward with respect to the side member 17. When the trailing arm 31 is pulled rearward, the outer cylinder 42 is displaced rearward of the inner cylinder 41 in the suspension bush 40.

  FIG. 5 shows a state in which the suspension bush 40 is sectioned in the same manner as in FIG. 3 and a load during braking is applied to the suspension bush 40 as described above.

  As shown in FIG. 5, the elastic body 43 is deformed when the outer cylinder 42 is displaced rearward relative to the inner cylinder 41. This deformation will be specifically described. In the first and third portions 50 and 70, which are the front portion of the elastic body 43, the distance between the outer tube 42 and the inner tube 41 is reduced by the displacement of the outer tube 42 toward the rear of the vehicle body. Compressed in the longitudinal direction A of the vehicle body. FIG. 5 shows a state in which the first and third portions 50 and 70 are compressed.

  In the second and fourth portions 51 and 71, which are the rear body portions of the elastic body 43, the outer cylinder 42 is displaced rearward of the vehicle body and the elastic body 43 is fixed to the outer cylinder 42 and the inner cylinder 41. The vehicle body extends in the longitudinal direction. FIG. 5 shows a state in which the second and fourth portions 51 and 71 extend in the longitudinal direction of the vehicle body.

  When the first and third portions 50 and 70 are compressed as described above, the angle α1 is larger than the angle β1 and the angle β3 is larger than the angle α3. The intermediate portion 110 between the notches 60 and 80 is deformed so as to be folded toward the vehicle width direction inner side and the vehicle body rear side.

  When the second and fourth portions 51 and 71 extend as described above, the angle β2 is larger than the angle α2 and the angle α4 is larger than the angle β4. The intermediate portion 111 between the notches 64 and 84 is displaced toward the vehicle width direction inner side and the vehicle body rear side.

  As described above, the intermediate portions 110 and 111 are displaced toward the vehicle width direction inner side and the vehicle body rear side, and the elastic body 43 and the outer tube 42 are fixed to each other, whereby the outer tube 42 is moved to the initial position. With respect to the inner side in the vehicle width direction and the rear side of the vehicle body. The initial position is a position when no load is applied to the suspension bush 40. In FIG. 5, the outer cylinder 42 and the elastic body 43 at the initial position are indicated by two-dot chain lines.

  When the outer cylinder 42 is displaced to the inner side in the vehicle width direction and the rear side of the vehicle body, the front end portion 31b of the trailing arm 31 fixed to the outer cylinder 42 has an inner side in the vehicle width direction and a rear side of the vehicle body with respect to the initial position. It will be displaced. The initial position of the front end portion 31b referred to here is a position in a state where the load is not applied to the suspension bush 40.

  FIG. 6 is a schematic diagram schematically showing the first suspension device 30 that connects the rear wheel 12 disposed on the left side of the vehicle body to the vehicle body 13. In FIG. 6, the trailing arm 31, the rear wheel 12, and the arm 33 in the initial position are indicated by solid lines. In FIG. 6, the rear wheel 12, the trailing arm 31, and the arm 33 during braking are indicated by a two-dot chain line. As indicated by a two-dot chain line in FIG. 6, during braking, the front end portion 31b of the trailing arm 31 is displaced inward in the vehicle width direction and the rear side of the vehicle body, so that the toe of the rear wheel 12 is moved from the initial position. It is displaced inward in the vehicle width direction, and therefore the rear wheel 12 during braking is toe-in. In FIG. 6, the displacement of the suspension device 30 is exaggerated and drawn greatly.

  The above operations and actions are the same in the second suspension device 100. Therefore, even the rear wheel 12 on the right side of the vehicle body is toe-in in the same manner as the rear wheel 12 on the left side of the vehicle body during braking.

  Thus, by forming the first and second grooves 44 and 46 in the suspension bush 40, the toe change of the rear wheel 12 at the time of braking can be stably performed without using a separate toe control arm. Can be controlled to change. That is, the toe change can be controlled while suppressing an increase in the number of parts.

  The suspension bush 40 is attached to the vehicle body 13 in such a posture that the axis X of the inner cylinder 41 is parallel to the vehicle width direction B. For this reason, the structure of the bracket 34 is not complicated. Furthermore, since the axial center line X is parallel to the vehicle width direction B, an increase in the size of the elastic body 43 can be suppressed. This point will be specifically described. If the axial center line X of the inner cylinder 41 is disposed so as to be inclined with respect to the vehicle width direction B, the load applied to the elastic body 43 during braking becomes a twisting force. The elastic body 43 tends to be large in order to absorb the twisting force and in consideration of durability. However, in the present embodiment, in the suspension bush 40, the axial center line X of the inner cylinder 41 is parallel to the vehicle width direction B, so that no twisting force acts on the elastic body 43. For this reason, it is not necessary to enlarge the elastic body 43, and therefore, enlargement can be suppressed.

  In the case where the axial center line X of the inner cylinder 41 is substantially parallel to the vehicle width direction B, a slight twisting force acts on the elastic body 43. For this reason, the range substantially parallel to the vehicle width direction B (a concept that does not include parallelism) is a range in which the elastic body 43 can absorb the twisting force without being particularly enlarged. Here, “not to be particularly large” means, for example, that the axial center line X of the inner cylinder 41 is the same size as when arranged in parallel to the vehicle width direction B.

  Further, since the first and second portions 50 and 51 are circular and the third and fourth portions 70 and 71 are circular, the load input to the elastic body 43 is inclined with respect to the vehicle body longitudinal direction A. The first to fourth cutouts 60, 64, 80, 84 are formed even if the elastic body 43 is sectioned on a plane parallel to the direction. For this reason, the toe of the rear wheel 12 can be changed to the in-side even when the load input to the elastic body 43 is not parallel to the vehicle body longitudinal direction A due to the road surface condition or the like.

  Next, a suspension device according to a second embodiment of the present invention will be described with reference to FIGS. In the present embodiment, configurations having functions similar to those of the first embodiment are denoted by the same reference numerals as those of the first embodiment, and description thereof is omitted. In the present embodiment, the attachment structure of the suspension bush 40 and the trailing arm 31 is different from that of the first embodiment. Other structures may be the same as those in the first embodiment. The different structure will be described.

  In this embodiment, the outer cylinder 42 of the suspension bush 40 is fixed to the vehicle body side, and the inner cylinder 41 is fixed to the trailing arm 31 side. FIG. 7 shows the suspension bushing 40 of the first suspension device 30 of the present embodiment passing through the axial center line X of the inner cylinder 41 in the state of being attached to the vehicle body 13 in the same manner as in FIG. FIG. 6 is a cross-sectional view showing a state in which the cross section is taken along a virtual plane that is parallel and extends along the vehicle body longitudinal direction A. A cross section 200 of the suspension bush 40 shown in FIG. 7 is an example of a predetermined cross section referred to in the present invention.

  FIG. 7 shows a state in which the suspension bush 40 is attached to the vehicle body 13 and no load is applied to the suspension bush 40. Even in the present embodiment, the structure of the second suspension device 100 may be the same as that of the first suspension device 30, and therefore the first suspension device 30 will be described as a representative.

  As shown in FIG. 7, in this embodiment, the inner cylinder 41 is fixed to the front end portion 31 b of the trailing arm 31. Specifically, as an example, the inner cylinder 41 and the trailing arm 31 are fastened and fixed to each other by a bolt 35 and a nut 36. This fixing is an example of fixing to the trailing arm side referred to in the present invention. The inner cylinder 41 is not displaced in the vehicle width direction B with respect to the trailing arm 31. A portion of the trailing arm 31 where the inner cylinder 41 is fixed is considered so as not to hinder the deformation of the elastic body 43.

  In addition, being fixed to the trailing arm side is a concept including directly fixing to the trailing arm as in the present embodiment and indirectly fixing via, for example, a bracket (not shown). is there.

  In the present embodiment, the outer cylinder 42 is fixed to the vehicle body 13 via a bracket (not shown). An example of the bracket fixing destination is the side member 17 as in the first embodiment. This fixing is an example of fixing to the vehicle body side in the present invention. The term “fixed to the vehicle body” as used herein is a concept including fixing to the vehicle body (side member) via a bracket and directly fixing to the vehicle body as in the present embodiment. For this reason, the outer cylinder 42 may be directly fixed to the side member 17. The outer cylinder 42 is not displaced in the vehicle width direction B with respect to the vehicle body 13.

  Next, the operation of the first and second suspension devices 30 and 100 will be described. Since the operation of the second suspension device 100 is the same as that of the first suspension device 30, the operation of the first suspension device 30 will be described as a representative.

  If the driver steps on the brake pedal while the automobile 10 is traveling forward, the rear wheels 12 are locked. As a result, the vehicle body 13 is displaced forward relative to the rear wheel 12. For this reason, the trailing arm 31 is pulled backward with respect to the side member 17. When the trailing arm 31 is pulled rearward, the inner cylinder 41 is displaced rearward of the outer cylinder 42 in the suspension bush 40.

  FIG. 8 is a cross-sectional view of the suspension bush 40 as in FIG. 7 and shows a state in which the above-described load during braking is applied to the suspension bush 40. In FIG. 8, the suspension bush 40 is shown by a solid line in a state where the suspension bush 40 is deformed by a load, and a state before the deformation is shown by a two-dot chain line.

  As shown in FIG. 8, the elastic body 43 is deformed by the inner cylinder 41 being displaced rearward relative to the outer cylinder 42. This deformation will be specifically described. In the first and third portions 50 and 70 that are the front side portion of the elastic body 43, the inner cylinder 41 is displaced rearward of the vehicle body and the elastic body 43 is fixed to the outer cylinder 42 and the inner cylinder 41. The distance between the outer cylinder 42 and the inner cylinder 41 increases, and therefore extends in the longitudinal direction of the vehicle body. FIG. 8 shows a state in which the first and third portions 50 and 70 are extended.

  In the second and fourth portions 51 and 71, which are the rear body portions of the elastic body 43, the distance between the outer tube 42 and the inner tube 41 is reduced by the displacement of the inner tube 41 toward the rear of the vehicle body. Compressed in the vehicle longitudinal direction. FIG. 8 shows a state in which the second and fourth portions 51 and 71 are compressed in the longitudinal direction A of the vehicle body.

  When the first and third portions 50 and 70 extend as described above, the angle α1 is larger than the angle β1 and the angle β3 is larger than the angle α3, so that the intermediate portion 110 of the elastic body 43 is in the vehicle width direction. Deformation toward the inside and the rear side of the vehicle body.

  Further, when the second and fourth portions 51 and 71 are compressed as described above, the angle β2 is larger than the angle α2 and the angle α4 is larger than the angle β4. Is deformed so as to be folded toward the vehicle width direction inner side and the vehicle body rear side.

  As described above, the intermediate portions 110 and 111 are displaced toward the vehicle width direction inner side and the vehicle body rear side, and the elastic body 43 and the inner cylinder 41 are fixed to each other. It is displaced toward the vehicle width direction inner side and the vehicle body rear side with respect to the position. The initial position referred to here is the position of the inner cylinder 41 in a state where no load is applied to the suspension bush 40.

  When the inner cylinder 41 is displaced to the inner side in the vehicle width direction and the rear side of the vehicle body, the front end portion 31b of the trailing arm 31 fixed to the inner cylinder 41 is located on the inner side in the vehicle width direction and the rear side of the vehicle body with respect to the initial position. It will be displaced. The initial position referred to here is the position of the front end portion 31b when no load is applied to the suspension bush 40. At the time of braking, the front end portion 31b of the trailing arm 31 is displaced inward in the vehicle width direction and the rear side of the vehicle body, so that the toe of the rear wheel 12 is displaced inward in the vehicle width direction with respect to the initial position. The rear wheel 12 of the time becomes toe-in.

  The above operations and actions are the same in the second suspension device 100. Therefore, even when the rear wheel 12 is on the right side of the vehicle body, the toe-in occurs in the same manner as the rear wheel 12 on the left side of the vehicle body during braking. As described above, in the present embodiment, the same effects as those in the first embodiment can be obtained.

  The shapes of the first to fourth cutouts 60, 64, 80, 84 used in the first and second embodiments are set according to the amount of toe change required for the rear wheel 12 used in the automobile 10. Is done.

  The present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above-described embodiments. For example, you may delete some components from all the components shown by embodiment mentioned above. Furthermore, you may combine the component covering different embodiment suitably. In the present invention, the toe change control at the time of braking is mentioned, but it can also be applied to the vehicle body posture control at the time of acceleration and cornering. Further, any suspension bush can be used, and the suspension device is not limited.

  The present invention is applicable to a suspension bush used in, for example, an automobile suspension device.

  DESCRIPTION OF SYMBOLS 13 ... Vehicle body, 30 ... 1st suspension apparatus (suspension apparatus), 31 ... Trailing arm, 40 ... Suspension bush, 41 ... Inner cylinder, 42 ... Outer cylinder, 43 ... Elastic body, 50 ... 1st part (1st 1), 51... Second portion (second groove), 60... First notch, 62... First line, 63... Second line, 64. , 67 ... fourth line, 70 ... third part (third groove part), 71 ... fourth part (fourth groove part), 80 ... third notch, 82 ... fifth line, 83 ... 6th line, 84 ... 4th notch, 86 ... 7th line, 87 ... 8th line, 200 ... Cross section (predetermined cross section), B ... Vehicle width direction, X ... Axis center line.

Claims (2)

A suspension bush provided at a connecting portion between a trailing arm and a vehicle body, the inner cylinder, an outer cylinder that accommodates the inner cylinder inside, and an inner cylinder that is provided between the inner cylinder and the outer cylinder. And an elastic body fixed to the outer cylinder and elastically deformable,
The elastic body is
A first groove provided on one side of the inner cylinder at one end and opening on one end;
A second groove that is provided on the other side across the inner cylinder at the one end and opens to the one end surface;
A third groove provided on the one side across the inner cylinder at the other end and opening on the other end;
A fourth groove that is provided on the other side across the inner cylinder at the other end and opens to the other end surface; and
In a predetermined cross section of the elastic body passing through the axis and parallel to the axis,
A first notch in a triangular shape that is a cross-section of the first groove and opens to the one end surface on the one side across the inner cylinder at the one end,
On the other side across the inner cylinder at the one end, a triangular second notch that is a cross section of the second groove and opens to the one end surface;
A triangular third notch that is a cross-section of the third groove and opens to the other end surface on the one side across the inner cylinder at the other end of the elastic body,
A triangle-shaped fourth notch that is a cross-section of the fourth groove and opens to the other end surface is formed on the other side across the inner cylinder at the other end,
Of the lines defining the first notch, the outer cylinder side line is the first line, the inner cylinder side line is the second line, and the first cylindrical axis line of the inner cylinder is the first line. The degree of inclination of the line is greater than the degree of inclination of the second line with respect to the axis;
Of the lines defining the second notch, the outer cylinder side line is the third line, the inner cylinder side line is the fourth line, and the fourth axial line with respect to the axial center line. The degree of inclination of the third line is greater than the degree of inclination of the third line with respect to the axis.
Of the lines defining the third notch, the outer cylinder side line is the fifth line, the inner cylinder side line is the sixth line, and the sixth cylinder axis line of the inner cylinder is the sixth line. The degree of inclination of the line is greater than the degree of inclination of the fifth line with respect to the axis;
Of the lines defining the fourth notch, the outer cylinder side line is the seventh line, the inner cylinder side line is the eighth line, and the seventh cylinder axis line of the inner cylinder is the seventh line. A suspension bush, wherein a degree of inclination of the line is larger than a degree of inclination of the eighth line with respect to the axial line. A suspension device for supporting wheels on a vehicle body,
A trailing arm,
A suspension bush for supporting the trailing arm on the vehicle body,
The suspension bush is
An inner cylinder fixed to the vehicle body side;
An outer cylinder that is fixed to the trailing arm side and accommodates the inner cylinder on the inside;
An elastic body provided between the inner cylinder and the outer cylinder and fixed to the inner cylinder and the outer cylinder and elastically deformable,
The suspension bush is attached to the vehicle body in a posture in which the axis of the inner cylinder is parallel to the vehicle width direction,
In the state where the suspension bush is attached to the vehicle body, the elastic body is
A first groove that is provided on the vehicle body front side across the inner cylinder at the vehicle width direction inner end portion and opens to the vehicle width direction inner end surface;
A second groove portion provided on the vehicle body rear side across the inner cylinder at the vehicle width direction inner end portion and opening to the vehicle width direction inner end surface;
A third groove portion provided on the vehicle body front side across the inner cylinder at the vehicle width direction outer end portion and opening to the vehicle width direction outer end surface;
A fourth groove portion provided on the rear side of the vehicle body across the inner cylinder at the vehicle width direction outer end portion and opening to the vehicle width direction outer end surface;
In a state where the suspension bush is attached to the vehicle body, it passes through the axial center line of the inner cylinder, is parallel to the axial center line, and within a predetermined cross section of the elastic body along the longitudinal direction of the vehicle body,
A triangular first notch that is a cross-section of the first groove portion and opens to the inner end surface in the vehicle width direction on the vehicle body front side across the inner cylinder at the vehicle width direction inner end portion;
A triangular second notch that is a cross-section of the second groove and opens to the inner end surface in the vehicle width direction on the vehicle body rear side across the inner cylinder at the vehicle width direction inner end portion;
A triangular third notch that is a cross-section of the third groove and opens to the outer end surface in the vehicle width direction on the vehicle body front side across the inner cylinder at the vehicle width direction outer end portion;
A triangular fourth notch that is a cross-section of the fourth groove and opens to the outer end surface in the vehicle width direction is formed on the rear side of the vehicle body with the inner cylinder sandwiched at the outer end portion in the vehicle width direction. ,
Of the lines defining the first notch, the outer cylinder side line is the first line, the inner cylinder side line is the second line, and the first cylindrical axis line of the inner cylinder is the first line. The degree of inclination of the line is greater than the degree of inclination of the second line with respect to the axis;
Of the lines defining the second notch, the outer cylinder side line is the third line, the inner cylinder side line is the fourth line, and the fourth axial line with respect to the axial center line. The degree of inclination of the third line is greater than the degree of inclination of the third line with respect to the axis.
Of the lines defining the third notch, the outer cylinder side line is the fifth line, the inner cylinder side line is the sixth line, and the sixth cylinder axis line of the inner cylinder is the sixth line. The degree of inclination of the line is greater than the degree of inclination of the fifth line with respect to the axis;
Of the lines defining the fourth notch, the outer cylinder side line is the seventh line, the inner cylinder side line is the eighth line, and the seventh cylinder axis line of the inner cylinder is the seventh line. A suspension device, wherein the degree of inclination of the line is larger than the degree of inclination of the eighth line with respect to the axis.

Images