Patent Publication Number: US-2023158830-A1

Title: Wheel cap

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application is based on and claims priority under 35 USC 119 from Japanese Patent Application, No. 2021-188865 filed Nov. 19, 2021, the disclosure of which is incorporated by reference herein in its entirely. 
     BACKGROUND 
     Technical Field 
     The present disclosure relates to a wheel cap for mounting to a wheel of a vehicle. 
     Related Art 
     In a wheel cap of Japanese Utility Model Application Laid-Open (JPU) No. H05-2321, an attachment claw includes two claw bodies formed bent into a shape of open legs, and the attachment claw is employed for hooking and retaining. The wheel cap is accordingly attached to a wheel disc by the claw bodies of the attachment claw straddling between hole edges of two heat dissipation holes of the wheel disc. 
     The two claw bodies of the attachment claw each undergo similar elastic deformation and are hooked onto the hole edges of the two heat dissipation holes. 
     SUMMARY 
     In consideration of the above circumstances, the present disclosure provides a wheel cap with suppressed rattling about with respect to a wheel. 
     A wheel cap of a first aspect of the present disclosure includes a cap body, a first engagement leg, and a second engagement leg. The cap body has a wheel side face that is configured to be disposed on a side of a wheel, and has another face serving as a styling face on an opposite side in an axial direction from the wheel side face of the cap body. The first engagement leg is provided standing out from the wheel side face and is configured to be inserted into a through hole of the wheel, with the first engagement leg abutting a first attachment portion of a peripheral edge of the through hole at a first angle with respect to an insertion direction such that the first engagement leg is able to suppress uncoupling of the cap body from the wheel. The second engagement leg is provided standing out from the wheel side face as a pair with the first engagement leg and is configured to be inserted into the through hole of the wheel, with the second engagement leg abutting a second attachment portion at the peripheral edge of the through hole at a second angle with respect to the insertion direction, the second angle being greater than the first angle such that the second engagement leg is configured to urge the first engagement leg toward the first attachment portion and to suppress uncoupling of the cap body from the wheel. 
     A wheel cap of a second aspect of the present disclosure includes a cap body, a first engagement leg, and a second engagement leg. The cap body has a wheel side face that is configured to be disposed on a side of a wheel, and has another face serving as a styling face on an opposite side in an axial direction from the wheel side face of the cap body. The first engagement leg is provided standing out from the wheel side face and is configured to be inserted into a first through hole of the wheel, with the first engagement leg abutting a first attachment portion of a peripheral edge of the first through hole at a first angle with respect to an insertion direction such that the first engagement leg is able to suppress uncoupling of the cap body from the wheel. The second engagement leg is provided standing out from the wheel side face as a pair with the first engagement leg and is configured to be inserted into a second through hole of the wheel, with the second engagement leg abutting a second attachment portion at a peripheral edge of the second through hole at a second angle with respect to the insertion direction, the second angle being greater than the first angle such that the second engagement leg is configured to urge the first engagement leg toward the first attachment portion and to suppress uncoupling of the cap body from the wheel. 
     A wheel cap of a third aspect is the first aspect or the second aspect, wherein the first angle is 0°. 
     A wheel cap of a fourth aspect is the first aspect or the second aspect, further includes an urging member configured to urge the first engagement leg toward the first attachment portion and to urge the second engagement leg toward the second attachment portion. 
     A wheel cap of a fifth aspect is the first aspect or the second aspect, wherein a protruding portion that protrudes toward a first attachment portion side of the peripheral edge of the through hole is provided at a portion of the first engagement leg that is protruded out from the through hole of the wheel. 
     In the wheel cap of the first aspect or the second aspect, the face on the opposite side of the cap body from the wheel side face serves as the styling face, and the first engagement leg and the second engagement leg are provided as a pair standing out from the wheel side face of the cap body. The first engagement leg is able to suppress uncoupling of the cap body from the wheel by being inserted into the through hole of the wheel and abutting the first attachment portion of the peripheral edge of the through hole. Moreover, the second engagement leg urges the first engagement leg toward the first attachment portion and suppresses uncoupling of the cap body from the wheel by being inserted into the through hole of the wheel and abutting the second attachment portion of the peripheral edge of the through hole. Uncoupling of the cap body from the wheel is accordingly suppressed by the first engagement leg and the second engagement leg. 
     The first engagement leg abuts the first attachment portion of the peripheral edge of the through hole at the first angle with respect to the insertion direction of the first engagement leg, and the second engagement leg abuts the second attachment portion of the peripheral edge of the through hole at the second angle with respect to an insertion direction of the second engagement leg, and the first angle is smaller than the second angle. 
     This enables the first engagement leg to bear some of the urging force of the second engagement leg, enables rattling about of the first engagement leg and the second engagement leg with respect to the through hole be suppressed, and enables rattling about of the cap body with respect to the wheel to be suppressed. 
     In the wheel cap of the third aspect, the first angle is 0°. Thus the first engagement leg effectively bears some of the urging force of the second engagement leg, and rattling about of the cap body with respect to the wheel can be suppressed from occurring. 
     In the wheel cap of the fourth aspect, the urging member urges the first engagement leg toward the first attachment portion and urges the second engagement leg toward the second attachment portion. This enables rattling about of the cap body with respect to the wheel to be effectively suppressed from occurring. 
     In the wheel cap of the fifth aspect, the protruding portion is provided at the first engagement leg that is protruded out from the through hole of the wheel. The protruding portion is accordingly able to effectively suppress movement of the first engagement leg and the second engagement leg in a direction of pull-out from the through hole, enabling uncoupling of the cap body from the wheel to be effectively suppressed from occurring. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Exemplary embodiments of the present disclosure will be described in detail based on the following figures, wherein: 
         FIG.  1    is a cross-section of relevant portions of a wheel cap according to a first exemplary embodiment, taken along a direction intersecting with a wheel radial direction; 
         FIG.  2    is a face-on view schematically illustrating a wheel cap according to the first exemplary embodiment; 
         FIG.  3    is a graph schematically illustrating load change with respect to a pull-out stroke of an engagement claw in the first exemplary embodiment; 
         FIG.  4    is a face-on view schematically illustrating relevant portions of a wheel cap according to a second exemplary embodiment; and 
         FIG.  5    is a cross-section of relevant portions of a wheel cap according to the second exemplary embodiment, taken along a direction intersecting with a wheel radial direction. 
     
    
    
     DETAILED DESCRIPTION 
     Detailed explanation follows regarding exemplary embodiments of the present disclosure, with reference to the drawings. 
     First Exemplary Embodiment 
       FIG.  2    illustrates a schematic configuration of a wheel cap  10  according to a first exemplary embodiment, as viewed face-on from a front side thereof.  FIG.  1    illustrates relevant portions of the wheel cap  10  in a cross-section taken along line  1 - 1  of  FIG.  2   . Note that in the drawings the outer surface side of the wheel cap  10  is indicated by arrow FS, a circumferential direction of the wheel cap  10  is indicated by arrow L, and a radial direction outer side of the wheel cap  10  is indicated by arrow R. 
     As illustrated in  FIG.  2   , the wheel cap  10  is mounted (attached) to an outer surface side of a wheel  12 . The wheel cap  10  includes a cap body  14  made from a resin and having a substantially circular disc shaped external profile, with the cap body  14  having a styling face  14 A on one side in an axial direction thereof. Plural decorative holes  16 A,  16 B that each have a substantially trapezoidal shape are formed so as to pierce through the cap body  14 , with the decorative holes  16 A,  16 B disposed alternately to each other along the circumferential direction of the cap body  14  and formed at the cap body  14  in a radiating shape overall. 
     The wheel  12  is made of metal (made of aluminum or steel, for example), and the wheel  12  is attached to a hub provided at a vehicle width direction outer side of a vehicle (neither of which are illustrated in the drawings). The cap body  14  of the wheel cap  10  is attached to the width direction (axial direction) outer side of the wheel  12 , is visible from vehicle exterior, and the wheel cap  10  covers and decorates the wheel  12 . 
     As illustrated in  FIG.  1    and  FIG.  2   , attachment holes  18  serving as through holes are formed so as to penetrate through outer peripheral portions of the wheel  12  that are covered by the cap body  14  (portions between the decorative holes  16 A and the decorative holes  16 B), with the plural attachment holes  18  being formed at specific intervals along the circumferential direction of the wheel  12  (not illustrated in the drawings). In the first exemplary embodiment, an opening center line C of each of the attachment holes  18  is substantially parallel to an axis line (center axis) of the wheel  12 . Note that the attachment holes  18  may have a circular shape and may have a rectangular shape. 
     An engaging portion  20  is provided at the cap body  14  at each position corresponding to the respective attachment holes  18  of the wheel  12 . In the first exemplary embodiment, in each of the engaging portions  20  an engagement claw  22  serving as a first engagement leg and an engagement claw  24  serving as a second engagement leg are provided as a pair so as to stand out from a back face of the cap body  14  (the face on the opposite side from the styling face  14 A, a wheel side face). The cap body  14  is mounted to the wheel  12  by the engagement claws  22 ,  24  of each of the plural engaging portions  20  being inserted so as to be disposed as far as a specific position (mounted position) into the attachment holes  18  of the wheel  12  and engage with the wheel  12 . 
     Portions of the wheel  12  at peripheral edges of the attachment holes  18  opposing the engagement claws  22  configure first attachment portions  18 A, and portions thereat opposing the engagement claws  24  configure second attachment portions  18 B. 
     The engagement claws  22 ,  24  are integrally formed to the cap body  14  so as to obtain a given rigidity and elasticity. The engagement claws  22 ,  24  include respective leg pillars  26 ,  28  provided so as to extend in directions parallel to the opening center line C of the attachment holes  18  (axial direction of the attachment holes  18 ), with ribs  30  formed between base portions of the respective leg pillars  26 ,  28  and the back face of the cap body  14 . In each of the engagement claws  22  a claw portion  32  serving as a protruding portion and as a first protruding portion is formed at a leading end portion of the leg pillar  26 , and in each of the engagement claws  24  a claw portion  34  serving as a second protruding portion is formed at a leading end portion of the leg pillar  28 . 
     The claw portion  32  of each of the engagement claws  22  protrudes out toward an opposite side from the engagement claw  24 , and by the engagement claw  22  being inserted into the attachment hole  18  as far as the specific position, the claw portion  32  is disposed further to the vehicle width direction inside than the attachment hole  18  and an opposing face  26 A of the leg pillar  26  opposes the first attachment portion  18 A of each of the attachment holes  18 . 
     The claw portion  34  of each of the engagement claws  24  protrudes out toward an opposite side from the engagement claw  22 . The leg pillar  28  is thicker walled than the leg pillar  26  at a face on a second attachment portion  18 B side of the leg pillar  28  (a shape corresponding to the claw portion  32  is illustrated thereon by the double-dot broken line). Thus an inclined face  34 A of the engagement claw  24  is provided so as to extend toward the base portion of the leg pillar  28  inclined in a direction away from the second attachment portion  18 B on progression from a protrusion leading end of the claw portion  34  toward the leg pillar  28  side. The inclined face  34 A abuts a corner portion at a vehicle width direction inner side of the second attachment portion  18 B of the attachment hole  18  (on the opposite side of the wheel  12  from the cap body  14 ) by the engagement claw  24  being inserted into the attachment hole  18  as far as the specific position. 
     The opposing face  26 A of the engagement claw  22  forms an angle α1 serving as a first angle with the opening center line C of the attachment hole  18 . Moreover, the inclined face  34 A of the engagement claw  24  forms an angle α2 serving as a second angle with the opening center line C of the attachment hole  18 . In the engaging portion  20 , the angle α2 is set as an acute angle (0&lt;α2&lt;90°), and the angle α1 is set smaller than the angle α2. The angle α1 is set to 0° (α1=0°) in the engaging portion  20 . 
     Moreover, in the engaging portion  20 , a separation interval between a face of the leg pillar  26  on the opposite side from that of the engagement claw  24  (a face on the first attachment portion  18 A side thereof) and a face of the leg pillar  28  on the opposite side from that of the engagement claw  22  (a face on the second attachment portion  18 B side thereof) is set smaller than an opening width of the attachment hole  18 . Moreover, in each of the engaging portions  20 , a separation interval between the opposing face  26 A of the engagement claw  22  and a protrusion leading end of the claw portion  34  of the engagement claw  24  is set larger than the opening width of the attachment hole  18 . Thus the engagement claws  22 ,  24  are able to move in an insertion direction and a pull-out direction into/out of the attachment hole  18  by leading end portions of the claw portions  32 ,  34  being moved so as to approach each other. 
     An engagement spring  36  serving as an urging member is provided to the engaging portion  20 , with the engagement spring  36  being formed from a strip shape of metal bent into a substantially U-shape, and with a bending center of the engagement spring  36  disposed on the cap body  14  side and interposed between the engagement claws  22 ,  24 . 
     The engagement spring  36  is anchored onto projections  38  respectively formed at the claw portion  32  of the engagement claw  22  and at the claw portion  34  of the engagement claw  24 , with the projections  38  protruding in directions approaching each other at respective upper ends of the claw portion  32  and of the claw portion  34 . 
     An anchor portion  40  is formed at each leading end portion of the engagement spring  36 . Bent portions  40 A are formed by bending intermediate portions of the anchor portions  40  in directions toward each other, and leading ends of the anchor portions  40  are provided in directions heading away from each other. 
     The engagement spring  36  is respectively anchored to the engagement claws  22 ,  24  by the projection  38  of the engagement claw  22  and the projection  38  of the engagement claw  24  each being housed in the respective bent portions  40 A of the anchor portion  40 , such that the engagement claws  22 ,  24  are urged in directions away from each other. Note that recesses or through holes may be formed at the bent portions  40 A of the engagement spring  36  for the leading ends of the projections  38  to fit together with, such that vibration of the wheel  12  does not cause the projections  38  to come out of the bent portions  40 A and does not cause the engagement spring  36  to come off from the engagement claws  22 ,  24 . 
     Next, description follows regarding operation of the first exemplary embodiment. 
     The plural attachment holes  18  are disposed along a circumferential direction of the wheel  12  to which the wheel cap  10  is attached, with the attachment holes  18  being formed piercing through the wheel  12 . The engaging portions  20  are formed at the cap body  14  of the wheel cap  10  so as to be aligned with each of the attachment holes  18 . The engaging portions  20  each include the engagement claw  22  formed with the claw portion  32  on the leg pillar  26  and the engagement claw  24  formed with the claw portion  34  on the leg pillar  28  arranged as a pair. The engagement spring  36  is provided to the engaging portion  20 , with the engagement spring  36  disposed so as to straddle between the engagement claws  22 ,  24 . 
     The styling face  14 A is on the outer surface side of the cap body  14 , and the cap body  14  is attached to the wheel  12  so as to decorate the outer surface of the wheel  12  by the engagement claws  22 ,  24  disposed at the opposite side face of the cap body  14  from the styling face  14 A approaching each other against urging force of the engagement spring  36  so as to be inserted into and disposed in the attachment holes  18 . 
     Inserting the engagement claw  22  into the attachment hole  18  results in the claw portion  32  protruding out from the attachment hole  18  toward the vehicle width direction inner side and the opposing face  26 A of the leg pillar  26  being opposed to the first attachment portion  18 A at a peripheral edge of the attachment hole  18 . Inserting the engagement claw  24  into the attachment hole  18  results in the leading end portion of the claw portion  34  protruding out from the attachment hole  18  toward the vehicle width direction inner side, and the inclined face  34 A of the claw portion  34  being abutted against a corner of the second attachment portion  18 B at a peripheral edge of the attachment hole  18 . 
     In the engaging portion  20 , abutting the inclined face  34 A against the second attachment portion  18 B results in the opposing face  26 A abutting and pressing against the first attachment portion  18 A and the inclined face  34 A abutting and pressing against the second attachment portion  18 B. The engagement spring  36  also urges the engagement claws  22 ,  24  toward the first attachment portion  18 A and the second attachment portion  18 B, respectively. 
     Thus, although in the engaging portion  20 , the load generated by the engagement claw  22  and the load generated by the engagement claw  24  are different from each other, a specific load can be imparted to peripheral edges of the attachment hole  18  and engagement can be achieved. Moreover, the cap body  14  can be engaged with the wheel  12  by the engagement claws  22 ,  24  engaging with the peripheral edges of the attachment holes  18  of the wheel  12 . 
     Moreover, the engaging portions  20  need a large force to achieve an engagement-released state pulled out from the attachment holes  18 , and the engaging portions  20  are suppressed from uncoupling from the attachment holes  18 . The wheel cap  10  is attached to the wheel  12  by the cap body  14  engaging with the wheel  12  at plural locations around the circumferential direction of the wheel  12 . 
       FIG.  3    is a graph schematically illustrating load change with respect to a pull-out stroke of the engagement claws  22 ,  24  from the attachment holes  18 . Note that in  FIG.  3   , the horizontal axis indicates the pull-out stroke of the engagement claws  22 ,  24  from the attachment holes  18 , and the vertical axis indicates a load generated on the engagement claws  22 ,  24  and on the engaging portions  20  (and similarly on the wheel  12 ). The pull-out position in  FIG.  3    is a position where the engagement claws  22 ,  24  have been pulled out from the attachment holes  18  (a position where engagement with the attachment holes  18  has been released), and a mounted position is a position where the engagement claws  22 ,  24  have engaged with the attachment holes  18 . 
     As illustrated in  FIG.  3   , a specific load is imparted to the engagement claw  24  and the engaging portion  20  by the inclined face  34 A of the engagement claw  24  abutting the second attachment portion  18 B at the mounted position of the cap body  14  mounted to the wheel  12 . The engaging portions  20  are thereby retained inside the attachment holes  18 , and the cap body  14  is retained on the wheel  12 . 
     Then in order to pull the engagement claw  22  and the engagement claw  24  out from the attachment hole  18  from this state, a pull-out load at the engagement claw  22  increases until the claw portion  32  reaches the first attachment portion  18 A, and then this load gradually decreases when the protrusion leading end of the claw portion  32  passes the first attachment portion  18 A. Moreover, the load at the engagement claw  22  disappears as the claw portion  32  passes the pull-out position when pulled out from the attachment hole  18 . 
     Moreover, in order to pull the engagement claw  22  and the engagement claw  24  out from the attachment hole  18 , the second attachment portion  18 B moves relatively to the engagement claw  24  along the inclined face  34 A of the claw portion  34  toward the protrusion leading end of the claw portion  34 , and so there is a gradual increase in the pull-out load. This load reaches a maximum when the second attachment portion  18 B is positioned at the protrusion leading end of the claw portion  34 , and then this load decreases when the second attachment portion  18 B passes the protrusion leading end of the claw portion  34 . This load at the engagement claw  24  disappears as the claw portion  34  has passed the pull-out position when pulled out from the attachment hole  18 . 
     Furthermore, in the engaging portion  20  the engagement claws  22 ,  24  are imparted with an urging force by the engagement spring  36 , and the load of the engagement claws  22 ,  24  during the pull-out stroke is increased by the urging force of the engagement spring  36 . There is accordingly a large increase in the load during the pull-out stroke of the engaging portion  20  from the attachment hole  18 , and the engaging portion  20  is prevented from uncoupling from the attachment hole  18 . Moreover, the engagement spring  36  is interposed between the engagement claw  22  and the engagement claw  24 . This means that the engagement claw  22  presses the engagement spring  36  toward the engagement claw  24  when the claw portion  32  of the engagement claw  22  catches on the first attachment portion  18 A, and in turn the engagement spring  36  presses the engagement claw  24  (the second protruding portion) toward the second attachment portion  18 B. This accordingly increases the load to pull the engaging portion  20  out from the attachment hole  18  (see  FIG.  3   ), enabling the engaging portion  20  to be effectively prevented from uncoupling from the attachment hole  18 . 
     However in the engaging portion  20 , the engagement spring  36  is interposed between the engagement claws  22 ,  24  and the engagement spring  36  urges the engagement claws  22 ,  24  toward the first attachment portion  18 A and the second attachment portion  18 B, respectively. The cap body  14  is thereby effectively engaged with the attachment holes  18  of the wheel  12 , and the wheel cap  10  is effectively attached to the wheel  12 . 
     The anchor portions  40  of the engagement spring  36  are moreover respectively anchored to the projections  38  at the leading end portions of the engagement claws  22 ,  24 , and the engagement spring  36  urges the leading end portions of the engagement claws  22 ,  24 . Thus the leg pillars  26 ,  28  are urged by the engagement spring  36  in a spreading direction about fulcra of the first attachment portion  18 A and the second attachment portion  18 B. This means that in cases in which bending of the leg pillars  26 ,  28  was to occur in the engagement claws  22 ,  24 , such bending of the leg pillars  26 ,  28  is eliminated and the engagement claws  22 ,  24  are suppressed from undergoing creep deformation. 
     In each of the engaging portions  20 , the angle α1 of the opposing face  26 A of the engagement claw  22  abutting the first attachment portion  18 A is smaller than the angle α2 of the inclined face  34 A of the engagement claw  24  abutting the second attachment portion  18 B (α1&lt;α2&lt;90°). This enables the engagement claw  22  to bear some of the urging force on the engagement claw  24  in the engaging portion  20 , and respective movement of the engagement claws  22 ,  24  relative to the attachment hole  18  is suppressed more than when the angle α1 and the angle α2 are the same as each other. This enables rattling about of the wheel cap  10  to be suppressed from occurring. 
     Moreover, the angle α1 is set to 0° (α1=0°) in the engaging portion  20 . This means that inserting the engagement claws  22 ,  24  into the attachment hole  18  so as to be disposed therein results in the engagement claw  22  being retained with respect to the first attachment portion  18 A by the urging force on the engagement claw  24 , enabling the engaging portions  20  to retain the cap body  14  at a constant position with respect to the wheel  12 . 
     Second Exemplary Embodiment 
     Next explanation follows regarding a second exemplary embodiment of the present disclosure. 
       FIG.  4    is a face-on view illustrating relevant portions of a wheel cap  50  according to the second exemplary embodiment, and  FIG.  5    is a cross-section of the wheel cap  50  taken along line  5 - 5  of  FIG.  4   . 
     As illustrated in  FIG.  4   , the wheel cap  50  is mounted to an outer surface side of a wheel  52 . The wheel cap  50  includes a cap body  54  (only part thereof illustrated in  FIG.  4   ) made from a resin and having a substantially circular disc shaped external profile, with the cap body  54  having a styling face  54 A on one side in an axial direction thereof. Plural decorative holes  16 C that each have a substantially trapezoidal shape, for example, are formed piercing through the cap body  54 , with the decorative holes  16 C disposed along the circumferential direction of the cap body  54  and formed at the cap body  54  in a radiating shape overall. 
     Plural spokes  56  (only part thereof illustrated in  FIG.  5   ) are formed in a radial shape at the wheel  52  decorated by the cap body  54 , and parts of the cap body  54  between circumferential direction-adjacent decorative holes  16 C cover the spokes  56  of the wheel  52 . In the second exemplary embodiment, heat dissipation holes  58  (see  FIG.  5   ) are formed as through holes piercing the wheel  52  between the circumferential direction-adjacent spokes  56 , with the heat dissipation holes  58  piercing through along an axial direction of the wheel  52 . 
     Engaging portions  60  are provided at the cap body  54  at positions aligned with each of the spokes  56  of the wheel  52 . The engaging portions  60  each include an engagement claw  62  serving as a first engagement leg and an engagement claw  64  serving as a second engagement leg provided as a pair so as to stand out from a back face of the cap body  54  (a face on the opposite side from that of the styling face  54 A, a wheel side face). In the engaging portions  60 , the engagement claws  62  are each aligned with a heat dissipation hole  58  at a circumferential direction one side of a given spoke  56 , and the engagement claws  64  are each aligned with a heat dissipation hole  58  at a circumferential direction other side of a spoke  56 , with the engagement claws  62 ,  64  inserted into each of the respective heat dissipation holes  58  along an axial direction of the wheel  52 . 
     In each of the engaging portions  60 , the engagement claw  62  has a similar external profile to that of the engagement claw  22  of the engaging portion  20  of the first exemplary embodiment, and the engagement claw  64  has a similar external profile to that of the engagement claw  24  of the engaging portion  20  therein. In each of the engaging portions  60 , the engagement claw  62  is inserted into and disposed at a specific position in the heat dissipation hole  58  on the circumferential direction one side of a spoke  56 , and the engagement claw  64  is inserted into and disposed at a specific position in the heat dissipation hole  58  on the circumferential direction other side of a spoke  56 . The engagement claws  62 ,  64  are engaged with the spokes  56  by each being inserted as far as the specific position into the heat dissipation holes  58 , and the cap body  54  is mounted to the wheel  52  thereby. 
     In the wheel  52 , a portion opposing the engagement claw  62  at a peripheral edge of the heat dissipation hole  58  on the circumferential direction one side of a spoke  56  configures a first attachment portion  56 A, and a portion opposing the engagement claw  64  at a peripheral edge of the heat dissipation hole  58  on the circumferential direction other side of the spoke  56  configures a second attachment portion  56 B. 
     The engagement claws  62 ,  64  are integrally formed to the cap body  54  so as to obtain a given rigidity and elasticity. The engagement claws  62 ,  64  include respective leg pillars  66 ,  68  provided so as to extend in directions along lines P substantially parallel to the axial line of the wheel  52 , with non-illustrated ribs (ribs  30 , for example) formed between base portions of the respective leg pillars  66 ,  68  and the back face of the cap body  54 . 
     In each of the engagement claws  62 , a claw portion  70  serving as a protruding portion and as a first protruding portion is formed at a leading end portion of the leg pillar  66 , and in each of the engagement claws  64 , a claw portion  72  serving as a second protruding portion is formed at a leading end portion of the leg pillar  68 . The claw portion  70  of each of the engagement claws  62  protrudes out toward an engagement claw  64  side (the first attachment portion  56 A side), and inserting the engagement claw  62  into the heat dissipation hole  58  as far as the specific position results in the claw portion  70  protruding further to the vehicle width direction inner side than the heat dissipation hole  58  with an opposing face  66 A of the leg pillar  66  opposing the first attachment portion  56 A of the spoke  56 . 
     The claw portion  72  of the engagement claw  64  moreover protrudes out toward an engagement claw  62  side (the second attachment portion  56 B side) and an inclined face  72 A is formed from a protrusion leading end thereof toward a leg pillar  68  side. The inclined face  72 A abuts (contacts) a vehicle width direction inner side corner of the second attachment portion  56 B of the spoke  56  by the engagement claw  64  being inserted into the heat dissipation hole  58  as far as the specific position. 
     The opposing face  66 A of the engagement claw  62  makes an angle α1 serving as a first angle with the line P along the insertion direction. The inclined face  72 A of the engagement claw  64  makes an angle α2 serving as a second angle with the line P along the insertion direction. The angle α2 is an acute angle (0&lt;α2&lt;90°), and the angle α1 is smaller than the angle α2, with the angle α1 set to 0° (α1=0°) in the engaging portion  60 . 
     A separation interval between a face on the first attachment portion  56 A side of the engagement claw  62  and a face on the second attachment portion  56 B side of the engagement claw  64  is set larger than a width of the spoke  56 . A separation interval between the opposing face  66 A on the first attachment portion  56 A side of the engagement claw  62  and a protrusion leading end of the claw portion  72  of the engagement claw  64  is set narrower than a width of the spoke  56 . Thus in the engaging portion  60 , the leading end portions of the claw portions  70 ,  72  are moved in directions away from each other, enabling the engagement claws  62 ,  64  to be inserted into/pulled out of the heat dissipation hole  58 , and enabling engagement with the spoke  56  and release of such engagement. 
     Engagement springs  74 ,  76  serving as urging members are provided at the engaging portion  60 , with the engagement springs  74 ,  76  being made in a strip shape from metal. Base end sides of the engagement springs  74 ,  76  are anchored to the back face of the cap body  54  and leading end sides thereof respectively extend toward the claw portion  70  of the engagement claw  62  and toward the claw portion  72  of the engagement claw  64 . 
     Projections  78  to which the engagement springs  74 ,  76  anchor are formed at the claw portion  70  and the claw portion  72 , with the projections  78  respectively projecting from upper end portions of the engagement claw  62  and the engagement claw  64  in directions away from each other. 
     A bent portion  80  bent into a substantially U-shape is formed at a leading end portion of each of the engagement springs  74 ,  76 . In the engagement spring  74 , the bent portion  80  opens toward the claw portion  70  of the engagement claws  62  and in the engagement spring  76 , the bent portion  80  opens toward the claw portion  72  of the engagement claw  64 . The projection  78  of the engagement claw  62  is housed in the bent portion  80  and the engagement spring  74  is anchored to the engagement claw  62 . The projection  78  of the engagement claw  64  is housed in the bent portion  80  and the engagement spring  76  is anchored to the engagement claw  64 . In the engaging portion  60 , the engagement springs  74 ,  76  are coupled together by a non-illustrated ring spring, and an urging force is applied to leading end sides of the engagement springs  74 ,  76  in a direction to approach each other. 
     In the second exemplary embodiment configured in this manner, the styling face  54 A of the cap body  54  is disposed at the outer surface side, and the engagement claws  62 ,  64  engage with the spokes  56  of the wheel  52  due to the engagement claws  62 ,  64  moving away from each other against the urging force of the engagement springs  74 ,  76  and being inserted into and disposed in the heat dissipation holes  58  of the wheel  52 . The cap body  54  of the wheel cap  50  is accordingly attached to the wheel  52  and decorates the outer surface side of the wheel  52 . 
     The engagement claws  62  are each disposed at the vehicle width direction inner side (back side) of the spoke  56  by the engagement claw  62  being inserted into a heat dissipation hole  58  on one side in the wheel  52  circumferential direction, with the opposing face  66 A of the leg pillar  66  abutting the first attachment portion  56 A of the spoke  56 . In the engagement claw  64 , the leading end portion of the claw portion  72  is also disposed at the vehicle width direction inner side (back side) of the spoke  56  by the engagement claw  64  being inserted into a heat dissipation hole  58  at the other side in the wheel  52  circumferential direction, with the inclined face  72 A of the claw portion  72  abutting the corner of the second attachment portion  56 B of the spoke  56 . 
     In the engaging portion  60 , the opposing face  66 A of the engagement claw  62  is abutted against the first attachment portion  56 A by the inclined face  72 A of the claw portion  72  of the engagement claw  64  being abutted against the second attachment portion  56 B. The engagement claws  62 ,  64  thereby engage with the spoke  56  by nipping the spoke  56 . When this occurs, the engagement claw  62  bears the urging force of the engagement claw  64  that is caused by the engagement claw  64  pressing the second attachment portion  56 B, and the engagement claw  62  urges the first attachment portion  56 A, and the engaging portion  60  is engaged with the wheel  52 . 
     The engaging portion  60  can accordingly apply a specific load to and engage with the peripheral edges of the spoke  56  of the wheel  52 . A large load also acts to release the engagement of the engaging portion  60  with the spoke  56 . Thus in the engaging portions  60 , the engagement claws  62 ,  64  engage with the spokes  56  of the wheel  52  so as to enable the cap body  54  to be engaged with the wheel  52 . The engaging portions  60  also need a large force to achieve a released state of engagement to the spokes  56 , enabling uncoupling of the cap body  54  from the wheel  52  to be suppressed. In the engaging portion  60 , the engagement springs  74 ,  76  respectively urge the engagement claws  62 ,  64 . The cap body  54  is accordingly effectively engaged with the spokes  56  of the wheel  52 , and the wheel cap  50  is effectively attached to the wheel  52 . 
     In the engaging portion  60 , the engagement springs  74 ,  76  are attached to the engagement claws  62 ,  64 , and the engagement springs  74 ,  76  urge the engagement claws  62 ,  64  in directions approaching each other. The engaging portions  60  are thereby effectively engaged with the spokes  56  (the wheel  52 ). 
     The engagement spring  74  is anchored to the leading end portion of the engagement claw  62 , and the engagement spring  76  is anchored to the leading end portion of the engagement claw  64 . The leg pillars  66 ,  68  of the engagement claws  62 ,  64  are urged by the engagement springs  74 ,  76  in a spreading direction about fulcra of the first attachment portion  56 A and the second attachment portion  56 B. In the engagement claws  62 ,  64 , flexing is accordingly suppressed from occurring in the leg pillars  26 ,  28 , suppressing creep deformation of the engagement claws  62 ,  64 . 
     Moreover, in the engaging portion  60 , the angle α1 of the opposing face  66 A of the engagement claw  62  abutting the first attachment portion  56 A is set smaller than the angle α2 of the inclined face  72 A of the engagement claw  64  abutting the second attachment portion  56 B (α1&lt;α2&lt;90°). Movement of each of the engagement claws  62 ,  64  is accordingly suppressed compared to cases in which the angle α1 and the angle α2 are the same as each other. Thus, the engaging portions  60  are able to suppress rattling about of the cap body  54  from occurring with respect to the spokes  56 . 
     Moreover, due to the angle α1 being set to 0° (α1=0°) in the engaging portions  60 , movement of the engagement claw  62  with respect to the first attachment portion  56 A is suppressed, and the engaging portions  60  are able to suppress rattling about of the cap body  54  with respect to the wheel  52  and retain the cap body  54 . 
     Note that although in the second exemplary embodiment, the engagement spring  74  and the engagement spring  76  are separate bodies, the engagement spring  74  and the engagement spring  76  may be integrally coupled together. This enables effective application of urging force to the engagement claws  62 ,  64 . 
     Moreover in the first exemplary embodiment and the second exemplary embodiment, the inclined face  34 A and the inclined face  72 A in the engagement claw  24  and in the engagement claw  64  are respectively formed so as to reach the protrusion leading end of the claw portion  34  and the protrusion leading end of the claw portion  72 . However, the protrusion leading end of the claw portion  34  and the protrusion leading end of the claw portion  72  may protrude further toward the second attachment portion  18 B side and the second attachment portion  56 B side than the inclined face  34 A and the inclined face  72 A, respectively. This enables uncoupling of the engaging portions  20  from the attachment holes  18  and release of engagement of the engaging portion  60  from the spokes  56  to be effectively prevented. 
     Note that in the first exemplary embodiment and the second exemplary embodiment, the engagement claws  22 ,  24  and the engagement claws  62 ,  64  are respectively arranged in a direction intersecting with a radial direction of the wheels  12 ,  52 . However, a first engagement leg and a second engagement leg may be arranged along a radial direction of a wheel. 
     The first exemplary embodiment and the second exemplary embodiment respectively employ the engagement claws  22 ,  24  and the engagement claws  62 ,  64 . However, any configuration may be adopted in which a first engagement leg is provided standing out from a face on a wheel side of a cap body, is inserted in a through hole in a wheel, and abuts a first attachment portion at a peripheral edge of the through hole at a first angle with respect to an insertion direction so as to be able to suppresses uncoupling of the cap body from the wheel, and a second engagement leg is provided standing out from the wheel side face of the cap body as a pair with the first engagement leg, is inserted in a through hole in the wheel, and abuts a second attachment portion of a peripheral edge of the through hole at a second angle greater than the first angle with respect to the insertion direction so as to urge the first engagement leg toward the first attachment portion and also suppress uncoupling of the cap body from the wheel.