Abstract:
A suspension arm attachment structure provided with a cylindrical vibration-damping bush which is attached to the side of a vehicle body via a core member. The attachment structure is provided with: a suspension arm having an attachment tube part fitted with a vibration-damping bush; and a retaining member which regulates the movement of the attachment tube part in the axial longitudinal direction. The retaining member is provided with: facing walls on sides thereof which respectively face end surfaces of the vibration-damping bush; a linking part which integrally links the facing walls; and an attachment part on one end and an attachment part on the other end which respectively extend in the axial longitudinal direction of a core member from the facing surface on one side and the facing surface on the other side and which are attached to the side of a vehicle body.

Description:
TECHNICAL FIELD 
       [0001]    The present invention relates to a suspension arm attachment structure including a tubular vibration-damping bush adapted to be fitted in a tubular attachment part of a suspension arm and to be attached to a vehicle body via a core member. 
       BACKGROUND ART 
       [0002]    One of such suspension arm attachment structures is comprised of a suspension arm (lower arm), a tubular attachment part formed on an end part of the suspension arm, a vibration-damping bush fitted in the tubular attachment part, and a core member forming a shaft part of the vibration-damping bush. In this structure, both ends of the core member are attached to the suspension member with bolts via separately formed stopper members. 
         [0003]    Known from such suspension arm attachment structure is a technology for preventing detachment of the tubular attachment part of the suspension arm from the vibration-damping bush when an excessive load is applied to the suspension arm from a road wheel side. This technology is disclosed in, for example, Patent Literature 1. 
         [0004]    The suspension arm attachment structure of Patent Literature 1, however, has a difficulty in properly providing a contact surface of the stopper member in parallel to an end surface of the vibration-damping bush, because of its configuration that each end of the core member is attached to the vehicle body side with the bolt via the separately formed stopper member. Such a configuration can cause an undesired one-side hitting of the end surface of the vibration-damping bush with respect to the contact surface of the stopper member due to, for example, a variation in attachment of the stopper member. This may result in unsuccessful fulfillment of the spring characteristics of the vibration-damping bush with respect to the stopper member, which spring characteristics is selectively chosen in advance. 
       PRIOR ART LITERATURE 
     Patent Literature 
       [0000]    
       
         Patent Document 1: Japanese Utility Model Application Laid-Open Publication No. H02-114583 
       
     
       SUMMARY OF INVENTION 
     Technical Problem 
       [0006]    It is therefore an object of the present invention to provide a suspension arm attachment structure provided with an improved accurate parallel disposition between a vibration-damping bush and a stopper member, and successful fulfillment of the spring characteristics of the vibration-damping bush. 
       Solution to Problem 
       [0007]    In order to accomplish the above mentioned object, the present invention provides a suspension arm attachment structure which comprises: a suspension arm adapted to be mounted to a vehicle body and connected to a knuckle supporting a vehicle wheel; a tubular attachment part provided to the suspension arm and supported so as to be swingable toward the vehicle body; a tubular vibration-damping bush fitted in the tubular attachment part and adapted to be mounted to the vehicle body via a core member; and a stopper member for preventing axial movement of the tubular attachment part, wherein the stopper member comprises: a pair of opposite walls provided in opposed relation to end surfaces of the vibration-damping bush; a connection part integrally connecting the opposite walls together; and a pair of attachment parts each extending axially of the core member from the respective opposite walls. 
         [0008]    Preferably, the stopper member is adapted to be secured to the vehicle body together with the core member via bolts. 
         [0009]    It is desirable that the vibration-damping bush be disposed so as to extend in a longitudinal direction of the vehicle body, one of the opposite walls have a through-hole for receiving one side of the core member and be disposed adjacent to a vehicle-rear-side end surface of the vibration-damping bush to nearly fully cover the vehicle-rear-side end surface, and other one of the opposite walls be disposed adjacent to a vehicle-front-side end surface of the vibration-damping bush to cover only that part of the vehicle-front-side end surface which is on a side of the connection part. 
         [0010]    Preferably, the other one of the opposite walls of the stopper member is set to have an outer dimension larger than that of the vehicle-front-side end surface of the vibration-damping bush and is provided with a concave part for receiving the core member. 
         [0011]    It is preferred that the one of the attachment parts of the stopper member be formed separately from the one of the opposite walls and joined thereto, the one of the attachment parts comprise a body part formed to allow passage of the bolt therethrough and adapted to be attached together with the core member to the vehicle body, a reinforcement part bent and continuing from the body part for reinforcing the one of the attachment parts, and an inclined-surface part provided in a bent fashion on a side of the body part which is closer to the vibration-damping bush and adapted to allow passage of the core member therethrough, and end parts of the reinforcement part and the inclined-surface part be welded to a vicinity of the through-hole of the one of the opposite walls. 
       Advantageous Effects of Invention 
       [0012]    In the suspension arm attachment structure of the present invention, it becomes possible to place the pair of opposite walls of the stopper member parallely to the respective end surfaces of the vibration-damping bush with improved accuracy. This results in successful prevention of one-side hitting of the end surfaces of the vibration-damping bush with respect to the respective opposite walls. Such a desirable operation is accomplished thanks to the configuration of the stopper member including the opposite walls facing the respective end walls of the vibration-damping bush, the connection member integrally connecting the opposite walls together, and the attachment parts extending axially of the core member from the respective opposite walls and connected to the vehicle body. 
         [0013]    More specifically, the accurate disposition of the opposite walls of the stopper member with respect to the corresponding end surfaces of the vibration-damping bush can be accomplished by the opposite walls disposed accurately in a parallelly face-to-face manner, integrally and firmly connected together with the connection part, and attached to the vehicle body through the pair of attachment parts together with the core member. Prevention of one-side hitting accomplished by such an arrangement allows the vibration-damping bush to successfully fulfill its spring characteristics, which is selectively chosen in advance, at a time of contact with the stopper member. 
         [0014]    With the stopper member secured to the vehicle body together with the core member using the bolts, it becomes possible to reduce the number of parts required in the manufacture of the suspension arm attachment structure. 
         [0015]    Furthermore, prevention of detachment of the tubular attachment part from the vehicle body side can be assured because of the stopper member whose one opposite wall is located close to the rear-end surface of the vibration-damping bush, which is disposed in the longitudinal direction of the vehicle, so as to nearly fully cover the rear-end surface. With such an operation, successful fulfillment of the spring characteristics of the vibration-damping bush can be accomplished at a time of contact of the rear-end surface to the one opposite wall of the stopper member. 
         [0016]    The other one of the opposite walls of the stopper member located on a front side of the vehicle is recognized to receive a little load. Upon consideration of such recognition, the other one of the opposite walls disposed relatively close to the front-end surface of the vibration-damping bush is arranged to cover the front-end surface only at a side of the connection part thereof. This arrangement enables an easy mounting operation of the stopper member to the core member. 
         [0017]    Since the other opposite wall of the stopper member has a larger outer dimension than the front-end surface of the vibration-damping bush and is provided with the concave part for the core member to pass through, a region of the second opposing wall to be opposed to the vibration-damping bush can be enlarged and a mounting operation of the core member can be facilitated. 
         [0018]    Furthermore, the one attachment part is provided with improved strength thanks to its configuration that it is separately formed and then joined to the one opposite wall and is comprised of the body part to be attached to the vehicle body together with the core member by passage of the bolts, and the reinforcement part continuously bent from the body part to reinforce the one attachment part. The strengthened one attachment part provides improved accuracy in attachment of the stopper member to the vehicle body side by serving as an indexing member for the stopper member. Moreover, the oen attachment part allows an easy installation of the core member to the stopper member by the inclined-surface part continuously bent from the body part, which inclined-surface part permits an easy passage of the core member through the through-hole of the one opposing wall. 
         [0019]    Furthermore, the reinforcement part can further improve the strength and rigidity of the one opposite wall because the end parts of the reinforcement part and the inclined-surface part are welded to the one opposite wall at a near side of the through-hole. This allows the first opposing wall to assuredly receive the rear-end surface of the vibration-damping bush even if an excessive load is applied to the vibration-damping bush. 
     
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         [0020]      FIG. 1  is a perspective view showing a vehicle employing a suspension arm attachment structure according to the present invention; 
           [0021]      FIG. 2  is an exploded perspective view showing a sub-chassis and a suspension arm of the suspension arm attachment structure according to the present invention; 
           [0022]      FIG. 3  is a front elevational view showing a suspension arm attachment structure according to a first embodiment of the present invention; 
           [0023]      FIG. 4  is a perspective view showing the suspension arm attachment structure of  FIG. 3 , as seen from a rear side of a vehicle body; 
           [0024]      FIG. 5  is a perspective view showing the suspension arm attachment structure of  FIG. 3 , as seen from a passenger compartment side of the vehicle; 
           [0025]      FIG. 6  shows the suspension arm attachment structure of  FIG. 3 , as seen in the direction of arrow  6 ; 
           [0026]      FIG. 7  shows the suspension arm attachment structure of  FIG. 3 , as seen in the direction of arrow  7 ; 
           [0027]      FIG. 8  is a cross-sectional view taken along line  8 - 8  of  FIG. 3 ; 
           [0028]      FIG. 9  is a cross-sectional view taken along line  9 - 9  of  FIG. 3 ; 
           [0029]      FIG. 10  is a top plan view showing a stopper member illustrated in  FIG. 3 ; 
           [0030]      FIG. 11  is a rear view showing the stopper member of  FIG. 10 ; 
           [0031]      FIG. 12  is a side view showing the stopper member of  FIG. 11 ; 
           [0032]      FIG. 13  is a front view showing a suspension arm attachment structure according to a second embodiment of the present invention; 
           [0033]      FIG. 14  is a side view showing the suspension arm attachment structure of  FIG. 13 , as seen in the direction of arrow  14 ; and 
           [0034]      FIG. 15  is a cross-sectional view showing the suspension arm attachment structure taken along line  15 - 15  of  FIG. 14 . 
       
    
    
     DESCRIPTION OF EMBODIMENTS 
       [0035]    Suspension arm attachment structures according to several preferred embodiments of the present invention will now be described below with reference to the accompanying drawings. 
       First Embodiment 
       [0036]    A suspension arm attachment structure of a first embodiment of the present invention is mounted on a vehicle  10  in a manner as shown in  FIGS. 1 and 2 . The vehicle  10  includes a vehicle body  11 , a front sub-chassis  13  mounted on the vehicle body  11  to support devices such as an engine (not shown) and a gear box, a suspension arm  14  swingably supported by the front sub-chassis  13 , a knuckle  15  supported by the suspension arm  14 , and a wheel  16  held by the knuckle  15 . 
         [0037]    The suspension arm attachment structure  20  of the first embodiment is mounted on the vehicle body  11  and includes the suspension arm  14  connected to the knuckle  15  that holds the wheel  16 , a tubular attachment part  41  provided to the suspension arm  14  and swingably supported by the vehicle body  11 , a core member  51 , a tubular vibration-damping bush  52  to be attached to the vehicle body  11  via the core member  51 , and a stopper member  46  arranged to control an axial movement of the tubular attachment part  41 . 
         [0038]    The core member  51  is secured to the front sub-chassis  13  of the vehicle body  11  side together with the stopper member  46  by bolts (fastening members) to thereby allow the suspension arm  14  of the suspension arm attachment structure  20  to move swingably with respect to the vehicle body  11  side, as will be described later. 
         [0039]    The front sub-chassis  13  has a generally rectangular shape and includes left and right vertical members  21 ,  22  extending in a longitudinal direction of the vehicle body  11 , and front- and rear-lateral members  23 ,  24  extending between front ends and rear ends of the respective vertical members  21 ,  22 . 
         [0040]    The left vertical member  21  has front- and rear-arm-supporting members  26 ,  27  used to support the suspension arm  14  swingably. The front-arm-supporting member  26  has front- and rear-bolt-attaching parts  28 ,  29  used for mounting the suspension arm  14 . The rear-arm-supporting part  27  has upper- and lower-flange parts  31 ,  32  used for mounting the suspension arm  14 . The right vertical member  22  is formed substantially identically to the left vertical member  21 . 
         [0041]    The suspension arm (lower arm)  14  supports a lower part of the knuckle  15 , has a generally L-shaped profile, and includes a knuckle-connecting part  34  for connecting the knuckle  15 , a lateral arm  35  extending inwardly of the vehicle  10  from the knuckling-connecting part  34 , and a vertical arm  36  extending longitudinally of the vehicle body  11  from the lateral arm  35 . 
         [0042]    The knuckle-connecting part  34  is provided with a shoulder bolt  37  to support the knuckle  15  via a knuckle side bush  38 . The lateral arm  35  is provided at its vehicle body  11  side with the tubular attachment part  41  that is attached to the front-arm-supporting part  26  of the front sub-chassis  13  via the vibration-damping bush  52 . The vertical arm  36  is provided at its rear end with a rear attachment part  43  to be attached to the rear-arm-supporting part  27  of the front sub-chassis  13  via a vertical bush  42 . 
         [0043]    The suspension arm attachment structure  20  of the first embodiment will be further described in detail with reference to  FIGS. 2 to 12 . 
         [0044]    As shown particularly in  FIGS. 2 to 5 , the suspension arm attachment structure  20  includes the front-arm-supporting part  26  formed on the front sub-chassis  13 , the suspension arm  14 , the tubular attachment part  41 , the stopper member  46 , and the bolts (fastening members)  47 ,  48 . The structure  20  also includes a vibration-damping bush assembly  45 . 
         [0045]    As specifically illustrated in  FIG. 8 , the vibration-damping bush assembly  45  is comprised of the core member (shaft)  51  made of metal, the tubular vibration-damping bush  52  made of elastic material, having a circumferential concave  52   a  on the center portion of its outer circumference and surrounding an outer circumference of the core member  51 , and an external cylinder  53  provided so as to be fitted in the circumferential concave  52   a  of the vibration-damping bush  52 . End surfaces  63 ,  63  of the outer circumference of the vibration-damping bush  52  and an outer circumference of the external cylinder  53  together form a flush surface so that no unevenness is formed therebetween. 
         [0046]    As shown in  FIGS. 8 and 9 , the core member  51  is comprised of a part  55  surrounded by the vibration-damping bush  52 , first curved parts  56 ,  56 , second curved parts  58 ,  58 , and first and second flat parts  57 ,  59  formed in flat and continuing from the cylindrical part  55  through the respective curved parts  56 ,  56 ,  58 ,  58 . 
         [0047]    The first flat part  57  has a round hole  61  serving as an indexing hole, while the second flat part  59  has a long hole  62  for absorbing variation in attachment of the core member  51 . 
         [0048]    The vibration-damping bush  52  is a tubular-shaped member, and has an outer circumference surface  63 , a vehicle-body-front-side end surface  64  (hereinafter referred to as “front-end surface  64 ”), a vehicle-body-rear-side end surface  65  (hereinafter referred to as “rear-end surface  65 ”), and curvedly formed chamfered surfaces  66 ,  67  formed between the outer circumference surface  63  and the respective front- and rear-end surfaces  64 ,  65 . 
         [0049]    The external cylinder  53  is provided with an axial length arranged substantially equal to that of the tubular attachment part  41 , so that only the end surfaces  64 ,  65  of the vibration-damping bush  52  made of elastic material are exposed. 
         [0050]    As shown in  FIGS. 5 to 8 , and  10  to  12 , the stopper member  46  is comprised of a pair of opposite walls  71 ,  72  opposed to the respective end surfaces  64 ,  65  of the vibration-damping bush  52 , a connection part  73  integrally connecting the opposite walls  71 ,  72 , and a pair of attachment parts  74 ,  75  extending axially outwardly of the core member  51  from the respective opposite walls  71 ,  72  to be attached to the vehicle body  11  together with the core member  51 . 
         [0051]    One opposite wall  71  has a through-hole  77  for receiving the first flat part  57  and the curved part  56  of the core member  51 . The one opposite wall  71  is disposed closely to the rear-end surface  65  of the vibration-damping bush  52  and nearly fully covers the rear-end surface  65 . 
         [0052]    The distance between the opposite walls  71 ,  72  is set to be longer than the length of the vibration-damping bush  52  to provide gaps between the walls  71 ,  72  and the respective end surfaces  64 ,  65  of the vibration-damping bush  52 . The gap between the one opposite wall  71  and the rear-end surface  65  is set to be smaller than that between the other opposite wall  72  and the front-end surface  64 . This is due to a general operation of a suspension arm that is pulled backward when a vehicle climbs over an object. The narrow gap between the one opposite wall  71 , located at a rear side of the vehicle, and the rear-end surface  65  allows an easy contact therebetween and permits the vibration-damping bush  52  to successfully fulfill its vibration-damping effect. 
         [0053]    Other opposite wall  72  is disposed relatively closely to the front-end surface  64  of the vibration-damping bush  52  and covers the front-end surface  64  merely at a side of the connection part  73  thereof. 
         [0054]    One attachment part  74  of the stopper member  46  is separately formed from the one opposite wall  71  and is joined thereto. The one attachment part  74  is comprised of a body part  81  to be attached to the front-arm-supporting part  26  of the front sub-chassis  13  in the vehicle body  11  side together with the core member  51 , reinforcement parts  82 ,  82  continuously bent from the body part  81  to reinforce the first attachment part  74 , an inclined-surface part  83  continuously bent from the body part  81  at a side of the vibration-damping bush  52  thereof and adapted to allow passage of the core member  51 , and an indexing hole  84  provided to the body part  81  for indexing the position of the stopper member  46  in corporation with a bolt  47  passing through the body part  81 . 
         [0055]    As shown in  FIG. 12 , the one attachment part  74  has the body part  81  and the two reinforcement parts  82 ,  82 , thereby forming a substantially U-shaped profile. Each of the reinforcement parts  82 ,  82  has an end part  82   a  that is welded to the one opposite wall  71  at a near side of the through-hole  77 . The inclined surface part  83  also has an end part  83   a  that is welded to the same wall  71  at a near side of the through-hole  77 . 
         [0056]    Other attachment part  75  of the stopper member  46  is continuously bent from the connection part  73  and has a through-hole  85  formed in a shape of a long hole for receiving a bolt  48 . The opposite walls  74 ,  75  are secured to the front-arm-supporting part  26  of the vehicle body  11  side together with the core member  51  by the bolts (fastening members)  47 ,  48 . 
         [0057]    As described above with reference to  FIGS. 1 to 12 , the suspension arm attachment structure  20  of the first embodiment is mounted on the vehicle body  11  and includes the suspension arm  14  connected with the knuckle  15  holding the wheel  16 , the tubular attachment part  41  provided to the suspension arm  14  and swingably supported by the vehicle body  11 , the core member  51 , the tubular vibration-damping bush  52  to be attached to the vehicle body  11  via the core member  51 . The suspension arm attachment structure  20  further includes the stopper member  46  arranged to control axial movement of the tubular attachment part  41 . 
         [0058]    According to the suspension arm attachment structure  20  of the first embodiment of the present invention, it becomes possible to place with improved accuracy the opposite walls  71 ,  72  of the stopper member  46  parallely to the respective end surfaces  64 ,  65  of the vibration-damping bush  52 . This results in successful prevention of one-side hitting of the end surfaces  64 ,  65  of the vibration-damping bush  52  with respect to the respective opposite walls  71 ,  72 . Such a desirable operation is accomplished thanks to the configuration of the stopper member  46  including the pair of opposite walls  71 ,  72  facing the respective end walls  64 ,  65  of the vibration-damping bush  52 , the connection member  73  integrally connecting the opposite walls  71 ,  72  together, and the pair of attachment parts  74 ,  75  extending axially of the core member  51  from the respective opposite walls  71 ,  72  and connected to the vehicle body  11  side. 
         [0059]    More specifically, the accurate disposition of the opposite walls  71 ,  72  of the stopper member  46  with respect to the corresponding end surfaces  64 ,  65  of the vibration-damping bush  52  can be accomplished owing to the opposite walls  71 ,  72  connected together integrally with the connection part  73  and to the core member  51  with its attachment parts  74 ,  75  connected to the vehicle body  11 . This enables the vibration-damping bush  52  to have spring characteristics set to function as desired, as the vibration-damping bush  52  and the stopper member  46  hit with each other, 
         [0060]    Since the stopper member  46  is secured to the vehicle body  11  together with the core member  51  using the bolts  47 ,  48 , it becomes possible to reduce the number of required parts. 
         [0061]    Note, for example, that the suspension arm (lower arm)  14  is often pulled rearwardly of the vehicle body  11  when the vehicle  10  is braked or travels over a bump. 
         [0062]    The vibration-damping bush  52  is disposed such that its axis lies in the longitudinal direction of the vehicle, and one opposite wall  71  is placed closely to the rear-end surface  65  of the vibration-damping bush  52  to substantially fully cover the surface  65 . This can assuredly prevent detachment of the tubular attachment part  41  of the suspension arm  14 , and allows the vibration-damping bush  52  to fulfill its target spring characteristics when the rear-end surface  65  hits the first opposing wall  71  of the stopper member  46 . 
         [0063]    It is know that the other opposite wall  72  of the stopper member  46  located on a front side of the vehicle receives only a little load. With this taken into consideration, the other opposing wall  72  disposed relatively closely to the front-end surface  64  of the vibration-damping bush  52  is arranged to cover the front end-surface  64  only at a side of the connection part  73  thereof. This arrangement enables an easy mounting operation of the stopper member  46  to the core member  51 . 
         [0064]    The one attachment part  74  of the stopper member  46  has a tough mechanical strength, since it is separately formed and joined to the one opposite wall  71 , and is comprised of the body part  81  to be attached to the vehicle body  11  together with the core member  51  by the bolts passing through the body part  81 , and reinforcement parts  82 ,  82  continuing in a bent fashion from the body part  81  for reinforcement of the first attachment part  74 . The mechanically tough one attachment part  74  provides improved accuracy in attachment of the stopper member  46  to the vehicle body  11  side by serving as an indexing member. 
         [0065]    Portion extending from the body part  81  at a side of the vibration-damping bush  52  is bent to form an inclined-surface part  83  that allows easy passage of the core member  51  onto the body part  81 . 
         [0066]    End parts  82   a ,  82   a  of the reinforcement parts  82 ,  82  and end part  83   a  of the inclined surface part  83  are weld-connected to a vicinity around the through-hole  77  of the first opposing wall  71 , providing more improved strength and rigidity to the one opposite wall  71 . Thus, the one opposite wall  71  can surely receive the rear-end surface  65  of the vibration-damping bush  52  even when an excessive load is applied to the vibration-damping bush  52 . 
       Second Embodiment 
       [0067]    A suspension arm attachment structure  100  according to a second embodiment of the present invention will be described next with reference to  FIGS. 13 to 15 . In the second embodiment, like components used in the suspension arm attachment structure  20  in the first embodiment shown in  FIGS. 1 to 12  are provided with the same reference numerals and detailed descriptions thereof are omitted. 
         [0068]    The suspension arm attachment structure  100  includes a front-arm-supporting member  26  of the front sub-chassis  13  (see  FIG. 2 ), a suspension arm  14  including a tubular attachment part  41 , a vibration-damping bush  52 , a stopper member  106  and bolts  47 ,  48 . The vibration-damping bush  52  with a combination of a core member (shaft)  51  and an external cylinder  53  configures a vibration-damping bush assembly  45 . 
         [0069]    The stopper member  106  includes a pair of opposite walls  111 ,  112  disposed in opposed relation to respective rear- and front-end surfaces  65 ,  64  of the vibration-damping bush  52 , a connection part  113  integrally connecting the opposite walls  111 ,  112  together, and a pair of attachment parts  114 ,  115  extending longitudinally of the core member  51  from the respective opposite walls  111 ,  112 . The first opposing wall  111  and the first attachment part  114  are formed identically to the one opposite wall  71  and the one attachment part  74 , respectively, of the first embodiment shown in  FIG. 8 . 
         [0070]    The one opposite wall  111  is provided with a through-hole  117  that receives a flat part  57  and curved parts  56 ,  56  formed at a side of the core member  51 . The other opposite wall  112  has a larger outer dimension than that of the front-end surface  64  and is provided with a concave part  118  that allows the core member  51  to pass therethrough. 
         [0071]    The one attachment part  114  is separately formed from the one opposite wall  111  and joined thereto. The one attachment part  114  has a body part  121 , reinforcement parts  122 ,  122  (only one shown), an inclined surface part  123  and an indexing hole  124 . The other attachment part  115  is bent and continues from the connection part  113  and has a through-hole for receiving the bolt  48 . 
         [0072]    In the second embodiment of the present invention, since the other opposite wall  112  has a larger outer dimension than that of the end surface  64  of the vibration-damping bush  52  and is provided with the concave part  118  for passage of the core member  51 , a region of the other opposite wall  112  to be opposed to the vibration-damping bush  52  can be enlarged and a mounting operation of the core member can be facilitated. 
         [0073]    As shown in  FIG. 8 , although the vibration-damping bush assembly  45  in the suspension arm attachment structure  100  of the present invention is comprised of the core member (shaft)  51 , the vibration-damping bush  52  and the external cylinder external cylinder  53 , it is not limited to such a configuration and may be comprised of the core member (shaft)  51 , the vibration-damping bush  52  and an internal cylinder disposed therebetween. 
         [0074]    As shown in  FIG. 2 , the suspension arm attachment structure according to the present invention is adapted to support a front portion of the suspension arm (lower arm)  14 , but it is not limited to such an arrangement and can be of supporting any portions of the suspension arm  14 . 
         [0075]    Furthermore, in the suspension arm attachment structure of the present invention, the first attachment part  74  of the stopper member  46  can be comprised of the body part  81  and two reinforcement parts  82 ,  82 , forming a U-shaped profile as shown in  FIG. 2 , but it can be comprised of a body part and a reinforcement part, thereby forming a L-shaped profile. 
       INDUSTRIAL APPLICABILITY 
       [0076]    The suspension arm attachment structure according to the present invention, which includes a tubular vibration-damping bush fitted in a tubular attachment part of a suspension arm to be attached to a vehicle body side via a core member, is particularly suitable for use on automobiles. 
       REFERENCE SINGS LIST 
       [0077]      10  vehicle;  11  vehicle body;  14  suspension arm;  15  knuckle;  16  wheel;  20 ,  100  suspension arm attachment structure;  41  tubular attachment part;  46  stopper member;  47 ,  48  bolts;  51  core member;  52  vibration-damping bush;  64  vehicle-body-front-side end surface (front-end surface);  65  vehicle-body-rear-side end surface (rear-end surface);  71  first opposing wall;  72  second opposing wall;  73  connection part;  74  first attachment part;  75  second attachment part;  77  through-hole;  81  body part;  82  reinforcement part;  82   a  end part;  83  inclined surface part;  83   a  end part;  112  second opposing wall;  118  concave part.