JP2009113567A - Suspension structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance vehicle controllability and stability when braking. <P>SOLUTION: In the suspension structure 10A, a first cushion rubber unit 12A and a second cushion rubber unit 12B have an inner cylinder 42 fixed to a vehicle body; an outer cylinder 40 fixed to a suspension member 13; and a first cushion rubber 44 interposed between the inner cylinder 42 and the outer cylinder 40 so as to be linearly extended in a horizontal direction, and are provided in parallel in a vehicle left/right direction. The first cushion rubber unit 12A and the second cushion rubber unit 12B indicate a linear line extending from respective parts in an extending direction of the first cushion rubber 44 included in the respective part viewed from above, and are arranged such that the first cushion rubber 44 included in the respective parts is compressed by the inner cylinder 42 and the outer cylinder 40 when braking force is given to the vehicle. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a suspension structure, and more particularly, to a suspension structure having a cushion rubber interposed between a vehicle main body and a suspension member.

A suspension structure in which cushion rubber is interposed between a vehicle body and a suspension member is known. As such a suspension structure, a suspension structure provided with a drum-shaped bush has been proposed (for example, see Patent Document 1). However, even in such a suspension structure, when a lateral force acts on the wheel from the road surface when the vehicle turns, the suspension member is liable to cause roll displacement. For this reason, a vehicle suspension has been proposed that includes an inner cylinder and an outer cylinder that have a portion inclined toward the inboard side of the vehicle, and an elastic body is interposed between the inner cylinder and the outer cylinder (for example, Patent Document 2).
U.S. Pat. No. 2,929,639 JP-A-3-287405

  In consideration of steering stability during cornering, the vehicle is preferably understeered. For this reason, generally, the suspension member on the rear side is designed such that the turning outer wheel moves in the toe-in direction using the force applied to the wheel during cornering. On the other hand, in recent years, development of an electronically controlled brake system that applies an appropriate braking force to each wheel independently has been advanced. In a vehicle employing such an electronic brake system, different braking forces may be applied to the left and right wheels, and for example, the rear suspension member may be moved to generate a steering angle. The steering angle generated in this way can be a cause of hindering the steering stability of the vehicle. For this reason, there is a need for development of a new technique that normally suppresses the movement of the suspension member during braking while allowing the movement of the suspension member to make the vehicle susceptible to understeer.

  Accordingly, the present invention has been made to solve the above-described problems, and an object thereof is to improve vehicle handling stability during braking.

  In order to solve the above-described problems, a suspension structure according to an aspect of the present invention includes a first support member fixed to one of the vehicle main body and the suspension member, and fixed to the other of the vehicle main body and the suspension member. Each has a second support member and a cushion rubber interposed between the first support member and the second support member so as to extend linearly in the horizontal direction, and are arranged in parallel in the vehicle left-right direction. A first cushion rubber unit and a second cushion rubber unit are provided. The first cushion rubber unit and the second cushion rubber unit are V-shaped in which a virtual straight line extending in the extending direction of the cushion rubber included in each of the first and second cushion rubber units expands forward or rearward of the vehicle as viewed from above. The cushion rubber included in each is arranged so as to be compressed by the first support member and the second support member when a braking force is applied to the vehicle.

  According to this aspect, the cushion rubber extending in the V-shaped direction can be compressed by the force in the vehicle front-rear direction applied to the cushion rubber unit during braking. For this reason, the movement of the suspension member in the left-right direction during braking can be suppressed, and the vehicle handling stability during braking can be improved.

  The first support member may have a first facing surface that is bent when viewed from the extending direction of the cushion rubber. The second support member may have a second facing surface that is bent when viewed from the extending direction of the cushion rubber so as to face the first facing surface. The cushion rubber may be interposed between the first facing surface and the second facing surface.

  According to this aspect, even when a vertical shift occurs between the first support member and the second support member due to a force acting in the vertical direction such as gravity, the shift is reduced by compressing the cushion rubber. Can be reduced. For this reason, the vertical movement of the suspension member during braking can be suppressed, and the vehicle handling stability during braking can be further improved.

  Another embodiment of the present invention is also a suspension structure. The suspension structure is fixed to one of the vehicle main body and the suspension member, and includes a first support member having a pair of first opposing surfaces each facing in the opposite direction in the horizontal direction, and the other of the vehicle main body and the suspension member. And a second support member having a pair of second facing surfaces, each facing the first facing surface, and two sets of first facing surfaces facing each other so as to extend parallel to each other in the horizontal direction Each of which has a pair of cushion rubbers interposed between the surface and the second opposing surface, respectively, and includes a first cushion rubber unit and a second cushion rubber unit arranged in parallel in the vehicle left-right direction. In the first cushion rubber unit and the second cushion rubber unit, a virtual extending direction straight line extending from each other in the extending direction of the pair of cushion rubbers included in each of the first cushion rubber unit and the second cushion rubber unit expands forward or rearward of the vehicle as viewed from above. Arranged to show a V-shape.

  According to this aspect, the cushion rubber can be compressed not only during braking but also during acceleration. For this reason, the horizontal movement of the suspension member during braking and acceleration can be suppressed, and vehicle handling stability during braking and acceleration can be improved.

  The suspension structure according to this aspect includes a first cushion member, a second cushion member, and a pair of cushion rubbers. The third cushion rubber unit and the fourth cushion rubber unit are arranged in parallel in the vehicle left-right direction. May be further provided. The third cushion rubber unit and the fourth cushion rubber unit are arranged in front of or behind the vehicle relative to the first cushion rubber unit and the second cushion rubber unit, and the straight lines extending from each of the first cushion rubber unit and the fourth cushion rubber unit are seen from above, the vehicle front or vehicle rear. It may be arranged so as to show a V-shaped expanding.

  According to this aspect, the cushion rubber in the two pairs of cushion rubber units can be compressed during braking, and the horizontal movement of the suspension member during braking can be effectively suppressed.

  Each of the pair of first opposed surfaces is formed so as to bend as seen from the extending direction of the pair of cushion rubbers, and each of the second opposed surfaces is formed of the pair of cushion rubbers so as to face the first opposed surface. Each of the pair of cushion rubbers may be interposed between each of the two pairs of the first facing surface and the second facing surface that face each other.

  Also in this aspect, when a vertical displacement such as gravity occurs between the first support member and the second support member, the cushion rubber is compressed to reduce the displacement. be able to.

  The third cushion rubber unit and the fourth cushion rubber unit have a V-shaped spreading direction indicated by an extending direction straight line extending from each of the third cushion rubber unit and an extending direction straight line extending from each of the first cushion rubber unit and the second cushion rubber unit. You may arrange | position so that it may become the same as the expansion direction of the V-shape shown.

  According to this aspect, when the cushion rubber is compressed during braking or acceleration, a force is applied to the portion of the suspension member interposed between the first cushion rubber unit and the second cushion rubber unit in the left-right direction. In this case, a force for compressing in the left-right direction is also applied to the portion of the suspension member interposed between the third cushion rubber unit and the fourth cushion rubber unit. Conversely, when the cushion rubber is compressed during braking or acceleration, a force that extends in the left-right direction is applied to the portion of the suspension member interposed between the first cushion rubber unit and the second cushion rubber unit. A force extending in the left-right direction is also applied to the portion of the suspension member interposed between the third cushion rubber unit and the fourth cushion rubber unit. Therefore, by making the extending direction of the cushion rubber V-shaped so as to expand in the same direction as described above, it is possible to avoid the wheels from turning in the toe-in or toe-out direction during braking or acceleration.

  The first cushion rubber unit and the second cushion rubber unit are arranged so that the extending direction straight line extending from each of the first cushion rubber unit and the second cushion rubber unit expands toward the rear of the vehicle as viewed from above. The rubber unit may also be arranged such that the extending direction straight line extending from each of the rubber units shows a V-shape expanding toward the rear of the vehicle as viewed from above.

  According to this aspect, when the vehicle is turning, a steering angle in the same direction as the turning direction can be given to the wheel supported by the suspension member. For this reason, the vehicle can be understeered and the steering stability of the vehicle can be further improved.

  The third cushion rubber unit and the fourth cushion rubber unit have a V-shaped spreading direction indicated by an extending direction straight line extending from each of the third cushion rubber unit and an extending direction straight line extending from each of the first cushion rubber unit and the second cushion rubber unit. You may arrange | position so that it may become reverse to the expansion direction of the V-shape shown.

  According to this aspect, for example, when the first cushion rubber unit and the third cushion rubber unit are arranged on the right side of the vehicle, and the second cushion rubber unit and the fourth cushion rubber unit are arranged on the left side of the vehicle, the first cushion rubber unit Also in the combination of the unit and the third cushion rubber unit, and in the combination of the second cushion rubber unit and the fourth cushion rubber unit, the extending direction straight line extending from each expands in the lateral direction of the vehicle as viewed from above. It will show a V-shape. For this reason, for example, even when a lateral force is applied to the wheels, the cushion rubber can be compressed to suppress the movement of the suspension member in the vehicle front-rear direction, and the vehicle handling stability during turning can be improved.

  According to the present invention, vehicle handling stability during braking can be improved.

  Hereinafter, embodiments of the present invention (hereinafter referred to as “embodiments”) will be described in detail with reference to the drawings.

(First embodiment)
FIG. 1 is a top view of the suspension structure 10A according to the first embodiment. The suspension structure 10A includes a suspension member 13 and a first cushion rubber unit 12A to a fourth cushion rubber unit 12D. Hereinafter, the front and rear of the vehicle will be simply referred to as “front” and “rear”, and the right and left sides of the vehicle will be simply referred to as “right” and “left”.

  The suspension member 13 supports left and right rear wheels (not shown) via a lower arm (not shown) or the like. The suspension member 13 has a right arm 14R, a left arm 14L, an arm 16, and an arm 18. The right arm 14R is formed to extend in the front-rear direction on the vehicle side. The right arm 14R is formed in a shape that is curved in an arc shape so that the center portion approaches the center of the vehicle. The left arm 14L is formed in a symmetrical shape with respect to the right arm 14R, and is formed to extend in the front-rear direction on the left side. The arm 16 is a linear member, and extends in the left-right direction to connect the right arm 14R and the left arm 14L in front. The arm 18 is a member formed in a straight line shape, extends in the left-right direction, and connects the right arm 14R and the left arm 14L at the rear.

  The first cushion rubber unit 12A is fixed to the front end of the right arm 14R, and the second cushion rubber unit 12B is fixed to the front end of the left arm 14L. The third cushion rubber unit 12C is fixed to the rear end of the right arm 14R, and the fourth cushion rubber unit 12D is fixed to the rear end of the left arm 14L. Hereinafter, the first cushion rubber unit 12A to the fourth cushion rubber unit 12D are collectively referred to as “cushion rubber unit 12” as necessary.

  2 is a cross-sectional view taken along the line PP in FIG. The PP cross-sectional view shows a cross-sectional view of the first cushion rubber unit 12A, but the other cushion rubber units 12 have the same configuration as the first cushion rubber unit 12A. For this reason, it demonstrates below as a structure of the cushion rubber unit 12. FIG.

  The cushion rubber unit 12 is configured by fitting and fixing two half units 22 in a pipe 26. The suspension member 13 is provided with a second support member 36 at each location where the cushion rubber unit 12 is attached. The 2nd support member 36 is formed in the cup shape by which the through-hole was provided below. The cushion rubber unit 12 is fixed to the suspension member 13 when the pipe 26 is press-fitted into the second support member 36. The cushion rubber unit 12 is further fastened to a first support member 34 that constitutes a part of the vehicle body by screwing bolts 32 from below through spacers 30.

  3A is a top view of the half unit 22 according to the first embodiment, and FIG. 3B is a QQ cross-sectional view of FIG. 3A. Hereinafter, description will be made in relation to both FIG. 3 (a) and FIG. 3 (b).

  The half unit 22 includes an outer cylinder 40, an inner cylinder 42, a pair of first cushion rubbers 44, and a pair of second cushion rubbers 46. The inner cylinder 42 is formed in a cylindrical shape, and a through hole 42a through which the bolt 32 is inserted is provided coaxially with the central axis. The inner cylinder 42 is formed with a pair of first opposed surfaces 42b in the vicinity of the end surface 42d so as to be cut by a plane inclined by a predetermined angle (about 30 ° in the first embodiment) with respect to the central axis. At this time, the pair of first opposing surfaces 42b are formed so as to face in opposite directions in the horizontal direction.

  The outer cylinder 40 is also formed in a cylindrical shape, and an accommodation hole 40a for accommodating the inner cylinder 42 is provided so as to penetrate coaxially with the central axis. A pair of second opposing surfaces 40b are formed on the inner surface of the accommodation hole 40a so as to oppose each of the pair of first opposing surfaces 42b of the inner cylinder 42. Each of the pair of second facing surfaces 40b is configured by a plane inclined by a predetermined angle (about 30 ° in the first embodiment) with respect to the central axis so as to be parallel to each of the pair of first facing surfaces 42b. ing.

  The first cushion rubber 44 is disposed between each of the pair of first opposing surfaces 42b and each of the pair of second opposing surfaces 40b, and each of the pair of first opposing surfaces 42b and the pair of second opposing surfaces 40b. Each of these is vulcanized and bonded. The first cushion rubber 44 has a uniform thickness so that each of the pair of first opposing surfaces 42b and each of the pair of second opposing surfaces 40b are parallel to each other. At this time, the inner cylinder 42 is disposed with respect to the outer cylinder 40 so that the end surface 42 d of the inner cylinder 42 is recessed more into the outer cylinder 40 than the end surface 40 c of the outer cylinder 40. A second cushion rubber 46 is vulcanized and bonded to the outer peripheral surface 42c of the inner cylinder 42 to restrict contact with the inner surface of the accommodation hole 40a of the outer cylinder 40 and to reduce impact.

  FIG. 4 is a cross-sectional view of the pipe 26 according to the first embodiment. The pipe 26 is formed in a cylindrical shape, and a through hole 26a is provided coaxially with the central axis.

  FIG. 5 is a diagram illustrating a state before the cushion rubber unit 12 according to the first embodiment is fastened by the bolt 32. FIG. 5 shows a cross-sectional view of the half unit 22 at the same location as the QQ cross section of FIG. The pair of half units 22 are coaxial with each other, and the outer cylinders 40 are in contact with each other so that the horizontal extending directions of the first cushion rubbers 44 are in the same direction. 40 is press-fitted into the through hole 26a of the pipe 26 and fixed. Thereby, the end surfaces 42d of the inner cylinders 42 of each of the pair of half units 22 are in a state of being separated from each other before being fastened by the bolts 32.

  When the cushion rubber unit 12 is fastened to the first support member 34 by the bolts 32, the end surfaces 42d of the two inner cylinders 42 that are separated from each other come into contact with each other. At this time, the first opposing surfaces 42b of the two inner cylinders 42 are continuous so as to be bent substantially in a “character shape” when viewed in the horizontal direction and in a direction parallel to the surface. Further, the second facing surface 40b of the outer cylinder 40 is continuous so as to be bent substantially in a “character shape” when viewed from the horizontal direction and parallel to the surface so as to face the first facing surface 42b. Four first cushion rubbers are arranged between the first facing surface 42b and the second facing surface 40b facing each other in this way. Thereby, in the process in which the cushion rubber unit 12 is fastened by the bolt 32 and the end surfaces 42d of the two inner cylinders 42 approach the difference, not only the shearing force but also the compressive force is applied to all the four first cushion rubbers 44. For this reason, the spring characteristic of the first cushion rubber 44 can be made non-linear, and for example, the necessity of providing a stopper rubber or the like for restricting the relative movement of the inner cylinder 42 and the outer cylinder 40 in the axial direction is reduced. Therefore, the cost can be reduced.

  FIG. 6 is a top view schematically showing the suspension structure 10A according to the first embodiment. In order to facilitate understanding, the suspension member 13 is shown as a rectangular outer shape, and each of the cushion rubber units 12 is shown enlarged. As shown in FIG. 6, each of the first cushion rubbers 44 provided in each of the cushion rubber units 12 extends parallel to each other in the horizontal direction with the inner cylinder 42 interposed therebetween.

  When a virtual straight line extending from the center of each of the cushion rubber units 12 is defined as an “extending direction straight line” in the extending direction of the first cushion rubber 44 included in each of the cushion rubber units 12, the first embodiment In the first cushion rubber unit 12A and the second cushion rubber unit 12B, each extending direction straight line has a V-shape that extends in the front direction by extending the extending direction straight line extending in the front-rear direction on the vehicle center line. Arranged as shown. Further, the third cushion rubber unit 12C and the fourth cushion rubber unit 12D are also arranged so as to show a V-shape in which the respective extending direction straight lines intersect on the vehicle center line and expand forward.

  In the first embodiment, the angle at which the extending direction straight lines of the first cushion rubber unit 12A and the second cushion rubber unit 12B intersect each other and the extension of each of the third cushion rubber unit 12C and the fourth cushion rubber unit 12D. The angle at which the straight lines in the direction intersect is a predetermined angle α. It should be noted that the extending direction straight lines of the first cushion rubber unit 12A and the second cushion rubber unit 12B intersect the extending direction straight lines of the third cushion rubber unit 12C and the fourth cushion rubber unit 12D. The angle to do may be different.

  For example, when a braking force is applied to the vehicle, a frictional force is generated between the wheels and the road surface, so that a force that causes the suspension member 13 to move backward acts on the vehicle body. Since the outer cylinder 40 is fixed to the suspension member 13 and the inner cylinder 42 is fixed to the vehicle body, the outer cylinder 40 tends to move rearward with respect to the inner cylinder 42 when a braking force is applied to the vehicle. The power to do will work. Therefore, the first cushion rubber unit 12A and the third cushion rubber unit 12C compress the left front first cushion rubber 44, and the second cushion rubber unit 12B and the fourth cushion rubber unit 12D compress the right front first cushion rubber 44. Is compressed. The first cushion rubber 44 of the first cushion rubber unit 12A and the first cushion rubber 44 of the second cushion rubber unit 12B, and the first cushion rubber 44 of the third cushion rubber unit 12C and the first cushion of the fourth cushion rubber unit 12D. Since the rubber 44 extends in a V shape in which the straight line in the extending direction expands forward, the suspension member 13 is restrained from moving in the left-right direction. This makes it possible to ensure the steering stability of the vehicle even when different braking forces are applied to the left and right wheels, for example, by an electronically controlled brake system.

  Further, since the first cushion rubber 44 is disposed between the first opposing surface 42b and the second opposing surface 40b that are bent and opposed to each other, the first cushion rubber 44 is compressed. The vertical shift between the inner cylinder 42 and the outer cylinder 40 is corrected. Thereby, the vertical movement of the suspension member 13 with respect to the vehicle body during braking can be suppressed, and the steering stability of the vehicle during braking can be further enhanced.

  Further, for example, during acceleration of the vehicle, a force is exerted on the vehicle body to move the suspension member 13 forward, so that a force is exerted on the outer cylinder 40 to move forward with respect to the inner cylinder 42. Become. For this reason, the first cushion rubber unit 12A and the third cushion rubber unit 12C compress the first cushion rubber 44 on the right rear side, and the second cushion rubber unit 12B and the fourth cushion rubber unit 12D compress the first rear left side. The cushion rubber 44 is compressed. According to the suspension structure 10A according to the first embodiment, the movement of the suspension member 13 in the left-right direction can be suppressed even during acceleration as described above. Also at this time, the first cushion rubber 44 is compressed because the first cushion rubber 44 is disposed between the first facing surface 42b and the second facing surface 40b that are bent to face each other and face each other. As described above, the vertical displacement between the inner cylinder 42 and the outer cylinder 40 is corrected.

(Second Embodiment)
FIG. 7 is a top view schematically showing the suspension structure 10B according to the second embodiment. The method for schematically representing the suspension structure 10B in FIG. 7 is the same as in FIG. Unless otherwise specified, the structure of the suspension structure 10B is the same as that of the suspension structure 10A according to the first embodiment.

  In the second embodiment, the first cushion rubber unit 12A and the second cushion rubber unit 12B are arranged so that the respective straight lines in the extending direction intersect with each other on the vehicle center line and expand toward the front. Is done. On the other hand, the third cushion rubber unit 12C and the fourth cushion rubber unit 12D are arranged so that each extending direction straight line intersects on the vehicle center line and shows a V-shape expanding rearward.

  In the second embodiment, the angle at which the extending direction straight lines of the first cushion rubber unit 12A and the second cushion rubber unit 12B intersect each other is a predetermined angle α, and the third cushion rubber unit 12C and the fourth cushion rubber The angle at which the extending direction straight lines of the rubber units 12D intersect each other is a predetermined angle β. Note that α and β may be the same angle.

  For example, when a braking force is applied to the vehicle, a force that causes the outer cylinder 40 to move backward acts on the inner cylinder 42. Therefore, the first cushion rubber unit 12A and the fourth cushion rubber unit 12D have the first front left side. The first cushion rubber 44 is compressed, and the first cushion rubber 44 on the right front side is compressed in the second cushion rubber unit 12B and the third cushion rubber unit 12C. As a result, the movement of the suspension member 13 in the left-right direction during braking can be suppressed, and the steering stability of the vehicle can be ensured. Since the first cushion rubber 44 is disposed between the first opposing surface 42b and the second opposing surface 40b that are bent and opposed to each other, the first cushion rubber 44 is compressed. The point in which the vertical displacement between the inner cylinder 42 and the outer cylinder 40 is corrected is the same as in the first embodiment.

  Furthermore, for example, when the vehicle is accelerated, the first cushion rubber unit 12A and the fourth cushion rubber unit 12D compress the right rear first cushion rubber 44, and the second cushion rubber unit 12B and the third cushion rubber unit 12C left The first cushion rubber 44 on the rear side is compressed. For this reason, the movement of the suspension member 13 in the left-right direction can be suppressed even during acceleration. Also at this time, the first cushion rubber 44 is compressed because the first cushion rubber 44 is disposed between the first facing surface 42b and the second facing surface 40b that are bent to face each other and face each other. As described above, the vertical displacement between the inner cylinder 42 and the outer cylinder 40 is corrected.

  Further, for example, when the vehicle is turning leftward, a force is exerted on the suspension member 13 so that the vehicle body moves rightward, and the inner cylinder 42 attempts to move rightward relative to the outer cylinder 40. The power to do works. Thereby, the first cushion rubber unit 12A and the fourth cushion rubber unit 12D compress the right rear first cushion rubber 44, and the second cushion rubber unit 12B and the third cushion rubber unit 12C compress the right front first cushion. The rubber 44 is compressed.

  Here, the suspension structure 10B according to the second embodiment has a V-shape in which each extending direction straight line expands rightward in the combination of the first cushion rubber unit 12A and the third cushion rubber unit 12C. In the combination of the second cushion rubber unit 12B and the fourth cushion rubber unit 12D, each extending direction straight line shows a V shape that expands in the left direction. For this reason, the movement of the suspension member 13 in the front-rear direction can be suppressed by the compression of the first cushion rubber 44 when the vehicle is turning, and the steering stability of the vehicle when the vehicle is turning can be improved. Also at this time, the first cushion rubber 44 is compressed because the first cushion rubber 44 is disposed between the first opposing surface 42b and the second opposing surface 40b facing each other by bending in a U shape. As described above, the vertical displacement between the inner cylinder 42 and the outer cylinder 40 is corrected.

(Third embodiment)
FIG. 8 is a top view schematically showing the suspension structure 10C according to the third embodiment. A method for schematically representing the suspension structure 10C in FIG. 8 is the same as that in FIG. Unless otherwise specified, the structure of the suspension structure 10C is the same as that of the suspension structure 10A according to the first embodiment.

  In the third embodiment, each of the first cushion rubber unit 12A and the second cushion rubber unit 12B has an extension direction straight line extending in the front-rear direction and an extension direction straight line intersecting on the vehicle center line and expanding rearward. Arranged to show a V-shaped opening. Further, the third cushion rubber unit 12C and the fourth cushion rubber unit 12D are also arranged so as to show a V-shape in which the extending direction straight lines intersect on the vehicle center line and expand rearward. That is, in the third cushion rubber unit 12C and the fourth cushion rubber unit 12D, the V-shaped spreading direction indicated by the extending direction straight line extending from each of the third cushion rubber unit 12C and the fourth cushion rubber unit 12D is from each of the first cushion rubber unit 12A and the second cushion rubber unit 12B. It arrange | positions so that it may become reverse to the expansion direction of V shape which the extending direction straight line shows.

  In the third embodiment, as in the first embodiment, the angle at which the extending direction straight lines of the first cushion rubber unit 12A and the second cushion rubber unit 12B intersect, the third cushion rubber unit 12C, The angles at which the extending direction straight lines of the four cushion rubber units 12D intersect each other are set to a predetermined angle α (not shown). It should be noted that the extending direction straight lines of the first cushion rubber unit 12A and the second cushion rubber unit 12B intersect the extending direction straight lines of the third cushion rubber unit 12C and the fourth cushion rubber unit 12D. You may be made to differ in the angle to do.

  For example, when a braking force is applied to the vehicle, the first cushion rubber unit 12A and the third cushion rubber unit 12C compress the first cushion rubber 44 on the right front side, and the second cushion rubber unit 12B and the fourth cushion rubber unit. In 12D, the first cushion rubber 44 on the left front side is compressed. Therefore, also in this aspect, the movement of the suspension member 13 in the left-right direction during braking can be suppressed. Also at this time, the first cushion rubber 44 is compressed because the first cushion rubber 44 is disposed between the first facing surface 42b and the second facing surface 40b that are bent to face each other and face each other. As described above, the vertical displacement between the inner cylinder 42 and the outer cylinder 40 is corrected.

  Further, for example, during acceleration of the vehicle, the first cushion rubber unit 12A and the third cushion rubber unit 12C compress the left rear first cushion rubber 44, and the second cushion rubber unit 12B and the fourth cushion rubber unit 12D rightward. The first cushion rubber 44 on the rear side is compressed. For this reason, also in 3rd Embodiment, the motion to the left-right direction of the suspension member 13 at the time of acceleration can be suppressed. Also at this time, the first cushion rubber 44 is compressed because the first cushion rubber 44 is disposed between the first facing surface 42b and the second facing surface 40b that are bent to face each other and face each other. As described above, the vertical displacement between the inner cylinder 42 and the outer cylinder 40 is corrected.

  For example, when the vehicle turns leftward, in each of the cushion rubber units 12, a force is exerted to move the outer cylinder 40 to the left with respect to the inner cylinder 42. Therefore, the first cushion rubber unit 12A and the third cushion rubber unit 12C compress the left rear first cushion rubber 44, and the second cushion rubber unit 12B and the fourth cushion rubber unit 12D compress the left front first One cushion rubber 44 is compressed.

  In the first cushion rubber unit 12A and the third cushion rubber unit 12C, the first cushion rubber 44 on the left rear side extends diagonally to the left, so the outer cylinder 40 tends to move to the left with respect to the inner cylinder 42. Due to this force, a force that the outer cylinder 40 tries to move forward with respect to the inner cylinder 42 is also generated. Further, in the second cushion rubber unit 12B and the fourth cushion rubber unit 12D, the first cushion rubber 44 extends diagonally to the left, and therefore the force that the outer cylinder 40 tends to move to the left with respect to the inner cylinder 42. As a result, a force that causes the outer cylinder 40 to move backward relative to the inner cylinder 42 is also generated. For this reason, as shown in FIG. 8, a force is applied to the suspension member 13 as a whole in the direction of rotating counterclockwise, and a steering angle θ in the same direction as the turning direction is applied to the rear wheel. Thus, by disposing the cushion rubber unit 12 as in the suspension structure 10C according to the third embodiment, the vehicle can be understeered when turning, and the steering stability of the vehicle can be further enhanced.

(Fourth embodiment)
FIG. 9A is a top view of the half unit 60 according to the fourth embodiment, and FIG. 9B is an RR cross-sectional view of FIG. 9A. The configuration of the suspension structure (not shown) according to the fourth embodiment is the same as that of the suspension structure according to the above-described embodiment except that a half unit 60 is provided instead of the half unit 22. Hereinafter, description will be made in relation to both FIG. 9A and FIG.

  The half unit 60 includes an outer cylinder 62, an inner cylinder 64, and a cushion rubber 66. The inner cylinder 64 is formed in a cylindrical shape, and a through hole 64a through which the bolt 32 is inserted is provided coaxially with the central axis. The inner cylinder 64 is formed with a conical surface-shaped first facing surface 64c in the vicinity of the end surface 64d of the outer peripheral surface 64b. The first facing surface 64c is inclined at a predetermined angle (about 30 ° in the fourth embodiment) with respect to the central axis so that the outer diameter gradually decreases as it approaches the end surface 64d.

  The outer cylinder 62 is also formed in a cylindrical shape, and an accommodation hole 62a for accommodating the inner cylinder 62 is provided so as to penetrate coaxially with the central axis. On the inner surface of the accommodation hole 62a, a second opposing surface 62b is formed that is inclined by a predetermined angle (about 30 ° in the fourth embodiment) with respect to the central axis so as to oppose the first opposing surface 64c of the inner cylinder 64. ing.

  The cushion rubber 66 is formed in a cylindrical shape whose outer surface and inner surface are conical surface shapes. The cushion rubber 66 has thick portions 66a formed in two portions located on opposite sides when divided into four equal parts in the circumferential direction, and the remaining two portions have the same thickness as the thick portion 66a. A thin portion 66b whose outer surface side is cut off is formed. The cushion rubber 66 is disposed between the first facing surface 64c and the second facing surface 62b, and is vulcanized and bonded to the first facing surface 64c and the second facing surface 62b. The cushion rubber 66 is formed with a uniform thickness so that the first facing surface 64c and the second facing surface 62b are parallel to each other. At this time, the inner cylinder 64 is arranged with respect to the outer cylinder 62 so that the end surface 64 d of the inner cylinder 64 is recessed in the inner direction of the outer cylinder 62 than the end surface 62 c of the outer cylinder 62.

  Thus, even if the first facing surface 64c and the second facing surface 62b are curved surfaces, the thick portions 66a of the two cushion rubbers 66 can be extended substantially linearly and in parallel, as in the above-described embodiment. It becomes possible to obtain the effect. In addition, by forming the first facing surface 64c and the second facing surface 62b as curved surfaces in this way, the processing of the outer cylinder 62 or the inner cylinder 64 can be facilitated, and the cost can be reduced.

  The present invention is not limited to the above-described embodiments, and an appropriate combination of the elements of each embodiment is also effective as an embodiment of the present invention. Various modifications such as design changes can be added to each embodiment based on the knowledge of those skilled in the art, and embodiments to which such modifications are added can also be included in the scope of the present invention. Here are some examples.

  In one variation, in the suspension structure 10A, each of the cushion rubber units 12 includes a first cushion rubber 44 included in the cushion rubber that extends linearly in the horizontal direction when a braking force is applied to the vehicle. Has only the position compressed by the inner cylinder 42 and the outer cylinder 40. For example, in the example shown in FIG. 6, the first cushion rubber unit 12A and the third cushion rubber unit 12C are provided so that only the first rear cushion rubber 44 on the right rear side extends linearly in the horizontal direction. The rubber unit 12B and the fourth cushion rubber unit 12D are provided so that only the first cushion rubber 44 on the left rear side extends linearly in the horizontal direction. By disposing the first cushion rubber 44 in this way, it is possible to compress the first cushion rubber 44 during braking and suppress the movement of the suspension member 13 in the left-right direction.

  In another modification, only one of the combination of the first cushion rubber unit 12A and the second cushion rubber unit 12B or the combination of the third cushion rubber unit 12C and the fourth cushion rubber unit 12D is extended. The direction straight line is arranged so as to indicate a V-shape in which the extending direction straight line extending in the front-rear direction intersects on the vehicle center line. In this case, the other combination may be arranged such that the extending direction straight line extends in the front-rear direction. In this way, in the combination of one set of cushion rubber units, the suspension member 13 can be moved in the left-right direction by compressing the cushion rubber when braking the vehicle even when the extending direction straight line is arranged in a V shape. Can be suppressed, and the steering stability of the vehicle can be improved.

1 is a top view of a suspension structure according to a first embodiment. It is PP sectional drawing in FIG. (A) is a top view of the half unit which concerns on 1st Embodiment, (b) is QQ sectional drawing of (a). It is sectional drawing of the pipe which concerns on 1st Embodiment. It is a figure which shows the state before fastening with the volt | bolt of the cushion rubber unit which concerns on 1st Embodiment. 1 is a top view schematically showing a suspension structure according to a first embodiment. FIG. 5 is a top view schematically showing a suspension structure according to a second embodiment. FIG. 10 is a top view schematically showing a suspension structure according to a third embodiment. (A) is a top view of the half unit which concerns on 4th Embodiment, (b) is RR sectional drawing of (a).

Explanation of symbols

  10A to 10C suspension structure, 12A first cushion rubber unit, 12B second cushion rubber unit, 12C third cushion rubber unit, 12D fourth cushion rubber unit, 13 suspension member, 22 half unit, 26 pipe, 32 bolt, 34 first 1 support member, 36 second support member, 40 outer cylinder, 40a accommodating hole, 40b second opposing surface, 40c end surface, 42 inner cylinder, 42a through hole, 42b first opposing surface, 42c outer peripheral surface, 42d end surface, 44th 1 cushion rubber.

Claims (8)

A first support member fixed to one of the vehicle body and the suspension member;
A second support member fixed to the other of the vehicle body and the suspension member;
A cushion rubber interposed between the first support member and the second support member so as to extend linearly in the horizontal direction;
Each having a first cushion rubber unit and a second cushion rubber unit arranged in parallel in the left-right direction of the vehicle,
In the first cushion rubber unit and the second cushion rubber unit, a virtual extending direction straight line extending from each other in the extending direction of the cushion rubber included in each of the first cushion rubber unit and the second cushion rubber unit expands forward or backward of the vehicle as viewed from above. The suspension structure is characterized in that the cushion rubber included in each of the first and second support members is arranged so as to be compressed when a braking force is applied to the vehicle. . The first support member has a first facing surface that is bent when viewed from the extending direction of the cushion rubber,
The second support member has a second facing surface that is bent when viewed from the extending direction of the cushion rubber so as to face the first facing surface,
The suspension structure according to claim 1, wherein the cushion rubber is interposed between the first facing surface and the second facing surface. A first support member fixed to one of the vehicle body and the suspension member, and having a pair of first opposing surfaces, each facing in the opposite direction in the horizontal direction;
A second support member fixed to the other of the vehicle body and the suspension member, each having a pair of second opposing surfaces that oppose the first opposing surface;
A pair of cushion rubbers each interposed between each of the two sets of the first facing surface and the second facing surface facing each other so as to extend in parallel with each other in the horizontal direction;
Each having a first cushion rubber unit and a second cushion rubber unit arranged in parallel in the left-right direction of the vehicle,
In the first cushion rubber unit and the second cushion rubber unit, a virtual extending direction straight line extending from each other in the extending direction of the pair of cushion rubbers included in each of the first cushion rubber unit and the second cushion rubber unit is seen from the upper side of the vehicle in front or rear of the vehicle. A suspension structure, which is arranged so as to show a V-shaped opening. Each of the first support member, the second support member, and the pair of cushion rubbers further includes a third cushion rubber unit and a fourth cushion rubber unit that are juxtaposed in the vehicle left-right direction,
The third cushion rubber unit and the fourth cushion rubber unit are arranged in front of or behind the first cushion rubber unit and the second cushion rubber unit, and the extending straight line extending from each is seen from above the vehicle. The suspension structure according to claim 3, wherein the suspension structure is arranged so as to show a V-shape that expands forward or rearward of the vehicle. Each of the pair of first opposed surfaces is formed so as to bend as seen from the extending direction of the pair of cushion rubbers,
Each of the second facing surfaces is formed to bend as seen from the extending direction of the pair of cushion rubbers so as to face the first facing surface,
5. The suspension structure according to claim 3, wherein each of the pair of cushion rubbers is interposed between each of the two sets of the first opposing surface and the second opposing surface that face each other. .   In the third cushion rubber unit and the fourth cushion rubber unit, the V-shaped expanding direction indicated by the extending direction straight line extending from each of the third cushion rubber unit and the fourth cushion rubber unit extends from each of the first cushion rubber unit and the second cushion rubber unit. The suspension structure according to claim 4, wherein the suspension structure is arranged so as to be the same as a V-shaped spreading direction indicated by a current direction straight line.   The first cushion rubber unit and the second cushion rubber unit are disposed so that extending direction straight lines extending from each of the first cushion rubber unit and the second cushion rubber unit expand toward the rear of the vehicle when viewed from above, The suspension structure according to claim 6, wherein the fourth cushion rubber unit is also arranged so that an extending straight line extending from each of the fourth cushion rubber units expands toward the rear of the vehicle when viewed from above.   In the third cushion rubber unit and the fourth cushion rubber unit, the V-shaped expanding direction indicated by the extending direction straight line extending from each of the third cushion rubber unit and the fourth cushion rubber unit extends from each of the first cushion rubber unit and the second cushion rubber unit. The suspension structure according to claim 4, wherein the suspension structure is disposed so as to be opposite to a V-shaped spreading direction indicated by a current direction straight line.

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