JP6389594B2 - Vehicle wheel and manufacturing method thereof - Google Patents

Vehicle wheel and manufacturing method thereof Download PDF

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Publication number
JP6389594B2
JP6389594B2 JP2013165935A JP2013165935A JP6389594B2 JP 6389594 B2 JP6389594 B2 JP 6389594B2 JP 2013165935 A JP2013165935 A JP 2013165935A JP 2013165935 A JP2013165935 A JP 2013165935A JP 6389594 B2 JP6389594 B2 JP 6389594B2
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vehicle
rim
radially
wheel
disk
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JP2015033919A (en
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安栄 田中
安栄 田中
章 竹中
章 竹中
和樹 谷
和樹 谷
陽平 桂木
陽平 桂木
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日産自動車株式会社
光生アルミニューム工業株式会社
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Description

  The present invention relates to a vehicle wheel and a manufacturing method thereof.
  Conventionally, a wheel for holding a tire is known (see, for example, Patent Document 1).
  The wheel described in Patent Document 1 includes a wheel body and a wheel cap mounted on the vehicle exterior side of the wheel body. The wheel body includes a rim portion that holds a tire, a hub portion that is supported by an axle, and a connecting portion that connects the rim portion and the hub portion, and a ventilation hole is formed in the connecting portion. The wheel cap is formed with a ventilation portion and an annular guide surface.
  When the vehicle travels, air flows outward through the air holes of the wheel body, and flows along the guide surface from the airflow of the wheel cap.
JP 2003-48403 A
  However, the wheel described in Patent Document 1 has a configuration in which the aerodynamic performance is improved by the wheel cap, so that there is a problem that the appearance of the wheel looks poor. Moreover, since the number of parts is increased by the wheel cap, there is a problem that the product cost increases.
  Accordingly, an object of the present invention is to provide a vehicle wheel having a high appearance in appearance while maintaining high aerodynamic performance and low cost.
The vehicle wheel according to the present invention includes a rim disposed on the vehicle inner side in a state of being mounted on the vehicle, and a disk configured separately from the rim and joined to the vehicle outer side of the rim. An annular peripheral portion provided on the outer side in the radial direction of the disk extends from the radially inner end of the first wall portion toward the inner side of the vehicle with a first wall portion having a flat surface facing the outer side of the vehicle. And a second wall portion. And while joining the back surface of a 1st wall part, and the edge part of a rim, the vehicle inner side edge part of a 2nd wall part is overlap | superposed on the radial direction inner surface of the base part of a rim | limb, and the contact surface in this overlap part These are joined together to form a first closed cross-sectional portion by the peripheral edge portion of the disk and the rim. The surface of the first wall portion is flush with the surface on the vehicle outer side at the radially outer end portion of the spoke portion connected to the peripheral edge portion.
The end of the rim includes a bent portion extending radially outward from the vehicle outer end of the base portion, a bead seat extending from the radially outer end of the bent portion toward the vehicle outer side, and the vehicle outer side of the bead seat And a flange portion extending radially outward from the end edge. The entire first wall portion is located on the vehicle outer side with respect to the bead seat, and the back surface of the first wall portion is joined to the flange portion on the outer side in the radial direction than the bead seat.
  According to the vehicle wheel according to the present invention, since the surface of the first wall portion at the peripheral edge portion of the disk is formed flat, the air resistance during traveling of the vehicle is reduced and high aerodynamic performance can be obtained. In addition, since there is no wheel cap, appearance can be improved and cruising distance can be improved by reducing weight.
1 is a front view showing a vehicle wheel according to a first embodiment of the present invention. It is sectional drawing along the AA line of FIG. It is sectional drawing to which the peripheral part of the disk of FIG. 2 was expanded. It is sectional drawing which shows the structure of the junction part of an overlap part. It is a flowchart which shows the manufacturing method of the wheel for vehicles. It is a graph which shows the relationship between the structure of the junction part in a superposition part, and joining strength, (a) is a graph which shows the ratio of the board | plate thickness ratio of the base part of a rim | limb with respect to the total board thickness, and joining strength. (B) is a graph which shows the relationship between the depth of the friction stirring area | region of the radial direction inner wall part side of a peripheral part, and joining strength. It is sectional drawing which shows the vehicle wheel concerning 2nd Embodiment of this invention.
  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following description, the outside in the vehicle width direction when the vehicle wheel is mounted is referred to as “vehicle outside”, and the inside in the vehicle width direction is referred to as “vehicle inside”. The direction of the central axis of the wheel is referred to as “axial direction”, the direction away from the central axis along the radial direction is referred to as “radial outside”, and the direction toward the central axis along the radial direction is referred to as “radial direction”. "Inside".
<First Embodiment>
As shown in FIGS. 1 and 2, the vehicle wheel 1 according to the present embodiment includes a rim 3 disposed on the inner side of the vehicle when mounted on the vehicle, and a disk 5 joined to the outer side of the rim 3. Yes. The disk 5 is configured separately from the rim 3.
  The rim 3 is disposed at a base portion 7 disposed at the center portion in the width direction of the rim 3, bead seats 9 and 11 disposed at both sides in the width direction of the base portion 7, and an inner end portion of the bead seat 11. , And ears 13 erected outward in the radial direction. A bead portion of a tire (not shown) is fitted into the bead sheets 9 and 11, and the ear portion 13 supports the outer side in the width direction of the bead portion.
  As shown in FIGS. 1 and 2, the disk 5 includes a hub portion 15 disposed in the central portion in the radial direction, a spoke portion 17 that extends linearly outward from the hub portion 15 in the radial direction, And an annular peripheral edge portion 19 provided continuously in the circumferential direction along the end portion on the outer side in the direction. The spoke portions 17 connect the hub portion 15 and the peripheral edge portion 19, and five spoke portions 17 are provided at equal intervals in the circumferential direction. The hub portion 15 has a hub hole 21 that is inserted into and supported by a hub on the axle side (not shown). The diameter of the disk 5 from the radial outer end 23 on one side to the outer radial end 25 on the other side across the central axis C of the hub hole 21 that is the central axis of the wheel 1 is D. A hub-side bolt 27 is fastened to the radially inner end of the spoke portion 17. The radial width of the peripheral edge portion 19 of the disk 5, specifically, the width of the surface 31 a of the vehicle outer wall portion 31 described later is L. Here, the relationship between D and L is set to satisfy 0.1D ≦ 2L ≦ 0.2D.
  As shown in FIG. 3, the peripheral edge portion 19 of the disk 5 includes a vehicle outer wall portion (first wall portion) 31 that is arranged on the vehicle outer side and extends along the radial direction, and a radial direction of the vehicle outer wall portion 31. The protrusion 33 protruding from the outer end toward the vehicle inner side and the radial inner side wall portion (second wall portion) 35 extending from the radial inner end of the vehicle outer wall portion 31 toward the vehicle inner side are integrated. Formed. The surface 31a of the vehicle outer side wall portion 31 constitutes a design surface that is formed flat so as to face the vehicle outer side. The surface 31a may be flat enough to rectify the air flow flowing along the surface of the disk 5 into a flow parallel to the surface 31a on the surface 31a. Therefore, “flat” includes a case where shallow unevenness for patterning the surface 31a or shallow unevenness for decoration is formed by etching or laser engraving. In the present embodiment, the surface 31a of the vehicle outer wall portion 31 forms a plane substantially perpendicular to the central axis C, and is substantially flush with the vehicle outer surface 17a at the radially outer end portion of the spoke portion 17. It has become.
  On the other hand, the vehicle outer side end portion 7a of the base portion 7 of the rim 3 is formed in a cylindrical shape having the central axis C as the central axis. On the vehicle outer side of the base portion 7, there is a bent portion 41 extending obliquely from the edge of the vehicle outer end portion 7 a of the base portion 7 radially outward and toward the vehicle outer side, and from the radially outer end of the bent portion 41 to the vehicle. A bead sheet 9 extending substantially parallel to the central axis C toward the outside is formed. A flange portion 43 is formed on the outer side of the bead seat 9 so as to extend radially outward from the outer edge of the bead seat 9. The flange portion 43 is formed by bending the outer end portion of the rim 3 outward in the radial direction. The end 43a of the flange 43 extends obliquely outward in the radial direction and toward the vehicle outer side, and the radial outer end surface 43b of the end 43a has a conical tapered surface that is reduced in diameter toward the vehicle outer side. Is formed. The bent portion 41, the bead seat 9, and the flange portion 43 constitute an end portion of the rim 3.
  The flange 43 is abutted against the protrusion 33 of the disk 5. More specifically, the end portion 43a of the flange portion 43 is abutted against the radially inner side surface 33b of the protruding portion 33 and the inner side surface (rear surface) 31b of the radially outer end portion 31e of the vehicle outer wall portion 31. . The radially inner side surface 33b of the protruding portion 33 is formed in a conical tapered surface that is reduced in diameter toward the vehicle outer side, and extends over the entire area in the circumferential direction with the radially outer end surface 43b of the end portion 43a of the flange portion 43. Are in contact with each other. A vehicle inner side surface 31b at the radially outer end 31e of the vehicle outer wall 31 is formed as a conical tapered surface that increases in diameter toward the vehicle outer side, and a vehicle outer side surface 43c of the end 43a of the flange portion 43. And abuts on the entire surface in the circumferential direction.
  In the abutting portion BJ between the flange portion 43 of the rim 3 and the protrusion portion 33 of the disk 5, the inboard end portion 33 c of the protrusion portion 33 and the inboard end portion 43 d of the flange portion 43 are arranged flush with each other. The flange part 43 and the projection part 33 are joined. Specifically, the radially outer end surface 43b of the flange portion 43 of the rim 3 is joined to the radially inner side surface 33b of the protruding portion 33 of the disk 5 by friction stir welding (FSW). In this friction stir welding, the cylindrical tool 51 is pressed against the welded portion while rotating at a high speed, and the base material of the welded portion is softened by frictional heat and is joined by plastic flow.
  In the present embodiment, since the radially outer end surface 43b of the flange portion 43 and the radially inner side surface 33b of the projection portion 33 are formed as tapered surfaces, the disk 5 is pressed in the axial direction toward the rim 3. The appropriate contact state between these surfaces can be easily obtained. The joining surface of the butted portion BJ is not limited to the above, and the vehicle outer side surface 43c of the end 43a of the flange portion 43 and the vehicle inner side surface 31b of the vehicle outer wall portion 31 of the disk 5 may be joined by friction stir welding. Good.
  Further, the radially inner side wall portion 35 of the peripheral edge portion 19 extends substantially orthogonally to the vehicle outer wall portion 31, and the vehicle inner end portion 35 a of the radially inner wall portion 35 is the base of the rim 3. The portion 7 is superposed on the radially inner side surface 7b. In the overlapping portion LJ, the radially outer surface 35b of the vehicle inner end portion 35a and the radially inner side surface 7b of the vehicle outer end portion 7a of the base portion 7 are in contact with each other. By joining these contact surfaces by friction stir welding, the radially inner side wall portion 35 of the peripheral edge portion 19 and the base portion 7 of the rim 3 are joined.
  In this way, the disc is obtained by joining between the flange portion 43 and the projection portion 33 in the butting portion BJ and joining between the base portion 7 and the radially inner side wall portion 35 of the peripheral edge portion 19 in the overlapping portion LJ. A first closed cross-section S1 is formed by the peripheral edge 19 and the rim 3.
  In the present embodiment, the peripheral edge portion 19 is disposed at the radially outer end of the disk 5, and the space of the first closed cross-section portion S <b> 1 is disposed inside the vehicle outer wall portion 31 of the peripheral edge portion 19. The space of the first closed cross section S1 is a space defined by the bent portion 41 of the rim 3, the bead seat 9 and the flange portion 43, the vehicle outer wall portion 31 and the radial inner side wall portion 35 of the disk 5. is there.
  As shown in FIG. 4, when the plate thickness of the base portion 7 of the rim 3 in the overlapping portion LJ is T1, and the plate thickness of the vehicle inner end portion 35a of the radially inner side wall portion 35 is T2, T1, T2 Satisfies the relationship T1 / (T1 + T2) ≧ 0.5. Further, when the region stirred by the plastic flow of the friction stir welding in the base material of the welded portion is defined as the friction stir zone SZ, the depth of the friction stir zone SZ on the vehicle inner side end portion 35a side of the radially inner side wall portion 35. D1 is set to 0.8 mm or more. The plate thickness T1 is preferably set to a predetermined thickness (for example, 8 mm) or less from the viewpoint of reducing the weight of the wheel 1. On the other hand, the plate thickness T2 can be reduced to a casting limit dimension (for example, 1.5 mm). Since the bonding strength increases as the depth D1 of the friction stir zone SZ increases, the friction stir zone SZ may be formed over the entire plate thickness T2. That is, the depth D1 of the friction stir zone SZ may be equal to the plate thickness T2.
  Next, a method for manufacturing the wheel 1 according to the present embodiment will be described.
  As shown in FIG. 5, in the method for manufacturing the wheel 1, the rim forming step S <b> 11 for forming the rim 3, the disc forming step S <b> 12 for forming the disc 5, and the rim 3 and the disc 5 are joined to assemble the wheel 1. A joining step S13 and a machining step S14 for adjusting the shape of the wheel 1 by machining are provided.
  In the rim forming step S11, the rim 3 including the base portion 7 and the end portions (in the present embodiment, the bent portion 41, the bead seat 9, and the flange portion 43) located on the vehicle outer side is formed. The method for forming the rim 3 is not particularly limited, and a known method is appropriately employed. The rim forming step S11 includes, for example, a casting step of casting a molten magnesium alloy or aluminum alloy into a predetermined mold and casting to obtain a cast material, a solution treatment and quenching treatment of the cast material, and an aging treatment thereafter. It may include a heat treatment step for obtaining a heat treatment material and a machining step for machining the heat treatment material. In addition, a spinning process may be provided between the casting process and the heat treatment process, and the heat treatment process may be performed on a cast material that has been formed by pressurizing and extending the cast material by warm spinning. Further, a homogenization and forging process may be provided instead of the casting process, and a heat treatment process may be performed on the forged material obtained by forging the cast billet subjected to the homogenization process. This forged material may be subjected to a heat treatment step after undergoing a spinning step.
  In the disk forming step S12, the disk 5 having the annular peripheral edge portion 19 continuous in the circumferential direction is formed. The peripheral edge portion 19 includes a vehicle outer wall portion 31 having a flat surface 31a facing the vehicle outer side, and a radial inner wall portion 35 extending from the radial inner end of the vehicle outer wall portion 31 toward the vehicle inner side. Form. The method for forming the disk 5 is not particularly limited, and a known method is appropriately adopted. In the disk forming step S12, for example, a molten magnesium alloy or an aluminum alloy is poured into a predetermined mold and cast to obtain a cast material, and the cast material is subjected to solution treatment and quenching, and then an aging treatment is performed. It may include a heat treatment step for obtaining a heat treatment material and a machining step for machining the heat treatment material. It should be noted that a homogenization and forging process may be provided instead of the casting process, and the heat treatment process may be performed on the forged material obtained by forging the cast billet subjected to the homogenization process.
  In the joining step S13, the rim 3 formed in the rim forming step S11 and the disc 5 formed in the disc forming step S12 are integrally joined to assemble the wheel 1. Specifically, the disc 5 is fitted to the outer end of the rim 3, the flange portion 43 of the rim 3 is abutted against the projection 33 of the disc 5, and the radially inner side wall portion 35 in the peripheral edge portion 19 of the disc 5. Is inserted into the base portion 7 of the rim 3, and the vehicle inner end portion 35 a is overlapped with the radially inner side surface 7 b of the base portion 7. Accordingly, the radially outer end surface 43b of the flange portion 43 is brought into contact with the radially inner side surface 33b of the projection portion 33, and the vehicle outer side surface 43c of the end portion 43a of the flange portion 43 is At the same time, the radially outer surface 35b of the vehicle inner end portion 35a is brought into contact with the radially inner side surface 7b of the base portion 7. Then, the rim 3 and the disk 5 fitted to the rim 3 are clamped from both sides in the axial direction by a jig outside the figure and fixed on a turntable outside the figure. If necessary, a suitable backing member is disposed on the radially inner side of the vehicle inner end portion 35a in the overlapping portion LJ.
  Next, the contact surfaces in the overlapping portion LJ are joined by friction stir welding by pressing the tool 51 from the outside in the radial direction. Specifically, as shown in FIG. 3, the tool 51 is rotated at a high speed around an axis substantially orthogonal to the axial direction, and the protrusion 51a provided at the tip of the tool 51 is replaced with the base portion 7 in the overlapping portion LJ. Insert from the outside in the radial direction. Then, the tip of the protrusion 51a penetrates through the base portion 7 of the rim 3 until it reaches a predetermined depth of the vehicle inner end portion 35a, and the shoulder portion 51b of the tool 51 is inserted radially outward of the base portion 7. Press against the side. As a result, frictional heat is generated between the protrusion 51a and the shoulder 51b and the base material in contact with the protrusion 51a, the base material is softened by the frictional heat, and the stirring action accompanying the high-speed rotation of the tool 51 is caused. The base material is plastically flowed. Then, the structure of the base portion 7 and the structure of the vehicle inner side end portion 35a in the overlapping portion LJ are kneaded to form a friction stir zone SZ as shown in FIG.
  Subsequently, for example, the tool 51 is relatively moved in the circumferential direction of the rim 3 by rotating the above-described turntable and rotating the wheel 1 around the central axis C thereof. As a result, the friction stir zone SZ is formed continuously in the circumferential direction, and the radially outer side surface 35b of the vehicle inner end portion 35a and the radially inner side surface 7b of the base portion 7 are continuously joined in the circumferential direction. The At this time, a joining mark (friction stirring mark) having a width W corresponding to the diameter of the shoulder portion 51b of the tool 51 is continuously formed in the circumferential direction on the radially outer surface of the overlapping portion LJ. This joining mark is an uneven shape formed on the surface of the friction stir zone SZ by the shoulder 51b that moves while rotating.
  In the joining step S13, the butted portion BJ is also joined by friction stir welding similarly to the overlapping portion LJ. Specifically, while the tool 51 is rotated at a high speed in an obliquely inclined position as shown in FIG. 3, the protrusion 51 a is moved in the radial inner side surface 33 b of the protrusion 33 and the radial direction of the flange 43. The shoulder 51b is pressed against the inner side end 33c of the protrusion 33 and the inner side end 43d of the flange portion 43 so as to penetrate between the outer end surface 43b. Then, the flange 51 of the rim 3 is joined to the protrusion 33 by moving the tool 51 relatively in the circumferential direction of the wheel 1. Thereby, a joint trace is also formed on the inner side surface of the butted portion BJ.
  In the machining step S14, the surface of the wheel 1 assembled in the joining step S13 is cut to adjust the wheel 1 to a predetermined size and shape. Specifically, the cutting edge of the cutting tool is relatively moved in the circumferential direction while abutting against the surface of the wheel 1 to cut the surface of the wheel 1. And when cutting the radial direction outer side surface of the wheel 1, at least the area | region corresponding to the overlap part LJ is cut with the joint trace produced by friction stir welding. Thereby, a joining trace is removed from the surface of the wheel 1, and a smooth surface is formed. In the machining step S14, in addition to the above-described cutting process, drilling may be performed, irregularities for forming a pattern on the surface may be formed, deburring, chamfering, surface polishing, etc. may be performed. Good.
  Below, the effect by this embodiment is demonstrated.
(1) The wheel 1 includes a rim 3 disposed on the vehicle inner side when mounted on the vehicle, and a disk 5 configured separately from the rim 3 and joined to the vehicle outer side of the rim 3. An annular peripheral edge portion 19 provided on the radially outer side of the disk 5 has a vehicle outer wall portion 31 having a flat surface 31a facing the vehicle outer side and a radially inner end of the vehicle outer wall portion 31 toward the vehicle inner side. And a radially inner side wall portion 35 extending. Then, the back surface 31 b of the vehicle outer side wall portion 31 and the end portion of the rim 3 are joined, and the vehicle inner side end portion 35 a of the radial inner side wall portion 35 is overlapped with the radial inner side surface 7 b of the base portion 7 of the rim 3. The contact surfaces of the overlapping portion LJ are joined together to form a first closed cross-section S1 formed by the peripheral edge 19 of the disk 5 and the rim 3.
  Thus, since the surface 31a of the vehicle outer side wall portion 31 at the peripheral edge portion 19 of the disk 5 is formed flat, the air resistance during vehicle travel is reduced, and the cruising distance is improved. Further, since the wheel cover is not used, the appearance of the appearance is improved. And since 1st closed cross-section part S1 was formed, the weight of the wheel 1 becomes small and a cruising distance further improves. Moreover, since the rigidity of the peripheral part 19 improves by 1st closed cross-section part S1, silence can be obtained.
(2) The inner end portion 35a of the radially inner side wall portion 35 in the peripheral edge portion 19 of the disk 5 is overlapped with the radially inner side surface 7b of the base portion 7 of the rim 3, and the contact surfaces of the overlapping portion LJ are in contact with each other. Are joined.
  Since the tool 51 can be pressed against the overlapped portion LJ with a stable force when performing friction stir welding, a bonded portion with few defects can be obtained. Thereby, the highly durable wheel 1 which has the more stable intensity | strength can be obtained. Moreover, since a junction part can be set smaller, the member used as a junction part can be thinned and the space of 1st closed cross-section part S1 can be expanded. Thereby, the lighter and highly rigid wheel 1 can be obtained. Furthermore, since the joining reliability is improved, the joining speed can be increased and the productivity can be improved. As a result, the wheel 1 can be produced at a lower cost.
(3) The peripheral edge portion 19 is arranged at the end portion on the radially outer side of the disk 5, and the space of the first closed cross-section portion S <b> 1 is arranged inside the vehicle outer wall portion 31 of the peripheral edge portion 19.
  Therefore, since the first closed cross-section portion S1 is disposed at the most radially outer portion of the wheel 1, the volume of the first closed cross-section portion S1 is increased. Therefore, the effect of reducing the weight of the wheel 1 and improving the rigidity of the peripheral edge portion 19 is further increased.
(4) A protrusion 33 extending toward the vehicle inner side is formed on the radially outer end of the vehicle outer wall portion 31 of the disk 5, and the vehicle outer end of the rim 3 is radially outer side of the protrusion 33. The flange portion 43 formed by bending the rim 3 is abutted, and at the abutting portion BJ, the vehicle inner end portion 33c of the projection portion 33 and the vehicle inner end portion 43d of the flange portion 43 are arranged flush with each other. The flange portion 43 is joined to the projection portion 33.
  Thus, since the vehicle inner end 33c of the protrusion 33 and the vehicle inner end 43d of the flange 43 are disposed flush with each other, the protrusion 33 and the flange 43 are formed by friction stir welding with high bonding strength. Can be efficiently joined.
(5) The relationship between the plate thickness T1 of the base portion 7 of the rim 3 in the overlapping portion LJ and the plate thickness T2 of the inboard end portion 35a of the radially inner side wall portion 35 is T1 / (T1 + T2) ≧ 0.5. Meet.
Accordingly, as shown in FIG. 6 (a), it is possible to obtain the fatigue strength required for the vehicle wheel 1, the bonding strength S 1 required to achieve the durability and impact resistance more reliably.
(6) The depth D1 of the friction stir zone SZ at the vehicle inner side end portion 35a of the radially inner side wall portion 35 is set to 0.8 mm or more.
Accordingly, as shown in FIG. 6 (b), it is possible to obtain the bonding strength S 1 necessary for realizing the fatigue strength required of the vehicle wheel 1 and the like more reliably.
(7) Since the radially inner side wall portion 35 extends substantially orthogonal to the vehicle outer side wall portion 31, the volume of the first closed cross section S1 can be set large, and the weight of the wheel 1 can be reduced. In addition, the effect of improving the rigidity of the peripheral edge portion 19 can be further increased.
(8) In the manufacturing method of the wheel 1, the vehicle inner side end portion 35 a of the radially inner side wall portion 35 is overlapped with the radially inner side surface 7 b of the base portion 7 of the rim 3, and the contact surfaces of the overlapping portion LJ are made to contact each other. The tool 51 is pressed from the outside in the radial direction and joined by friction stir welding. Therefore, the protrusion 33 and the flange 43 can be efficiently joined with high joint strength. Further, in the machining step S14 after joining, when the radial outer surface of the wheel 1 is cut, the region corresponding to the overlapped portion LJ is cut together with the joining trace generated by the friction stir welding. Therefore, it is possible to remove joint marks that can be a factor of reducing the fatigue strength of the wheel 1 in the machining step S14, and it is possible to obtain the wheel 1 having high fatigue strength while suppressing the processing cost. In addition, when cutting the radial direction outer surface of the wheel 1, it is good to cut also the area | region corresponding to butt | matching part BJ. Thereby, since the joint trace which arose in both the superimposition part LJ and the butt | matching part BJ can be removed by one cutting, the wheel 1 with high fatigue strength can be obtained, suppressing processing cost further.
Second Embodiment
Next, a second embodiment of the present invention will be described. However, parts having the same structure as in the first embodiment are denoted by the same reference numerals and description thereof is omitted.
  The vehicle wheel 61 according to the present embodiment is different from the first embodiment in that the second closed cross section S2 is formed in the spoke portion 17 of the disk 5. Since the manufacturing method of the wheel 61 is the same as that of the wheel 1 of 1st Embodiment, description is abbreviate | omitted here.
  As shown in FIG. 7, a first closed cross-section S <b> 1 is formed on the vehicle inner side of the peripheral edge 19 of the disk 5, and a second closed cross-section that extends over almost the entire length in the radial direction is formed on the spoke 17. Part S2 is formed. The second closed cross section S2 communicates with the first closed cross section S1. In FIG. 7, for convenience, a broken line is shown between the first closed cross section S1 and the second closed cross section S2.
  Below, the effect by this embodiment is demonstrated.
(1) According to the wheel 61 and the manufacturing method thereof according to the present embodiment, since the same configuration as the wheel 1 and the manufacturing method according to the first embodiment is provided, the same effects as those of the first embodiment are obtained. be able to.
(2) The disk 5 includes a peripheral edge portion 19, a hub portion 15 disposed in the central portion in the radial direction, a spoke portion 17 that extends along the radial direction and connects the peripheral edge portion 19 and the hub portion 15. And the second closed cross section S2 is formed in the spoke portion 17. As described above, by forming the second closed cross-section portion S2 in the spoke portion 17, the effects of reducing the weight of the vehicle wheel 61 and improving the rigidity of the peripheral portion are further increased.
  As mentioned above, although embodiment of this invention was described, these embodiment is only the illustration described in order to make an understanding of this invention easy, and this invention is not limited to the said embodiment. The technical scope of the present invention is not limited to the specific technical matters disclosed in the above embodiment, but includes various modifications, changes, alternative techniques, and the like that can be easily derived therefrom.
  In the above embodiment, the rim 3 and the disk 5 made of a magnesium alloy or aluminum alloy casting material or forging material are exemplified, but the material of the rim 3 and the disk 5 is not particularly limited and corresponds to the required specifications of the vehicle wheel. Can be changed as appropriate. For example, the material of the disk 5 may be a die-cast material, and the material of the rim 3 may be a wrought material. When the disk 5 is a forged material and the rim 3 is a wrought material, the effect of reducing the weight is increased. Further, when the disk 5 is a die-cast material, the productivity is increased and the manufacturing cost is reduced.
  In the above embodiment, the joining portion BJ and the overlapping portion LJ are joined by friction stir welding, but the joining method is not particularly limited, and arc welding such as MIG welding may be employed.
DESCRIPTION OF SYMBOLS 1,61 Vehicle wheel 3 Rim 5 Disc 7 Base part 7b Radial inner side surface of base part 15 Hub part 17 Spoke part 19 Peripheral part 31 Car outer wall part (first wall part)
31a Front surface of vehicle outer wall 31b Inner side surface of vehicle outer wall (back surface)
33 Protruding part 33c Car interior side end part of projecting part 35 Radial inner wall part (second wall part)
35a Car inner side end portion of radial inner wall portion 43 Flange portion 43d Car inner end portion of flange portion 51 Tool S1 First closed cross-section portion S2 Second closed cross-section portion BJ Butting portion LJ Superposition portion

Claims (8)

  1. A rim that is disposed on the vehicle inner side in a state of being mounted on a vehicle and has a base portion and an end portion located on the vehicle outer side from the base portion;
    A disc formed separately from the rim and joined to the vehicle exterior side of the rim,
    An annular peripheral portion provided on the outer side in the radial direction of the disk has a first wall portion having a flat surface facing the outer side of the vehicle, and extends from the radially inner end of the first wall portion toward the inner side of the vehicle. And a second wall portion
    The back surface of the first wall portion and the end portion of the rim are joined, and the vehicle inner end portion of the second wall portion is overlapped with the radially inner side surface of the base portion of the rim, Joining the contact surfaces to form a first closed cross-sectional portion by the peripheral edge of the disk and the rim,
    The surface of the first wall portion is flush with the outer surface of the vehicle at the radially outer end of the spoke connected to the peripheral edge ,
    The end portion of the rim includes a bent portion extending radially outward from the vehicle outer end portion of the base portion, a bead seat extending from the radially outer end of the bent portion toward the vehicle outer side, and the bead seat A flange portion extending radially outward from the outer edge of the vehicle,
    The first wall is entirely located on the vehicle outer side than the bead seat,
    The vehicle wheel according to claim 1, wherein a back surface of the first wall portion is joined to the flange portion at a radially outer side than the bead seat .
  2.   2. The vehicle wheel according to claim 1, wherein a surface of the first wall portion is flat from a radially inner end to a radially outer end of the first wall portion.
  3. With arranging the periphery to the radially outer end of the disk, the first closed cross-section portion, a vehicle according to claim 1 or 2, characterized in that disposed on the interior side of the peripheral edge wheel.
  4. The radially outer end of the first wall portion of said disk to form a projection which projects toward the interior side, the flange portion to the protrusion portion, formed by bending an end portion of the rim radially outwardly Match
    The projection portion and the flange portion are joined to each other at the abutting portion in a state where the vehicle inner end portion of the projection portion and the vehicle inner end portion of the flange portion are arranged flush with each other. The vehicle wheel according to any one of 1 to 3 .
  5. The disk includes the peripheral portion, a hub portion disposed in a central portion in the radial direction, and the spoke portion extending in the radial direction and connecting the peripheral portion and the hub portion. The vehicle wheel according to any one of claims 1 to 4, wherein a second closed cross-sectional portion is formed on the vehicle wheel.
  6. The overlapping portion is joined by friction stir welding,
    The plate thickness T1 of the base portion of the rim in the overlapping portion and the plate thickness T2 of the vehicle inner end portion of the second wall portion satisfy a relationship of T1 / (T1 + T2) ≧ 0.5. the vehicle wheel according to any one of claims 1 to 5, wherein.
  7. The vehicle wheel according to claim 6 , wherein the friction stir zone at the vehicle inner end of the second wall portion has a depth of 0.8 mm or more.
  8. Forming a rim including a base portion and an end portion located on the vehicle outer side from the base portion;
    Forming a disk having an annular peripheral edge continuous in the circumferential direction;
    A joining step of joining the rim and the disk to assemble a wheel;
    A machining step of cutting a radially outer surface of the wheel;
    With
    In the step of forming the disc, a first wall portion having a flat surface facing the vehicle outer side is formed at the peripheral edge portion, and a second wall extending from the radial inner end of the first wall portion toward the vehicle inner side. Forming a wall,
    In the joining step, the back surface of the first wall portion and the end portion of the rim are joined, and the vehicle inner side end portion of the second wall portion is overlapped with the radially inner side surface of the base portion of the rim, The abutting surfaces in the overlapped portion are joined by friction stir welding by pressing a tool from the outside in the radial direction,
    In the machining step, when cutting the outer surface in the radial direction of the wheel, cutting together with the joining trace generated by the friction stir welding,
    In the step of forming the disk, the surface of the first wall portion is processed to be flush with the surface on the vehicle outer side at the radially outer end portion of the spoke portion connected to the peripheral edge portion ,
    The end portion of the rim includes a bent portion extending radially outward from the vehicle outer end portion of the base portion, a bead seat extending from the radially outer end of the bent portion toward the vehicle outer side, and the bead seat A flange portion extending radially outward from the outer edge of the vehicle,
    When joining the back surface of the first wall portion and the end portion of the rim in the joining step, the back surface of the first wall portion, which is entirely located on the vehicle outer side than the bead seat, is made to be more than the bead seat. A method for manufacturing a vehicle wheel, wherein the vehicle wheel is joined to the flange portion on a radially outer side .
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JPH0385201U (en) * 1989-12-22 1991-08-29
EP0547313B1 (en) * 1991-11-23 1995-12-20 Dr.Ing.h.c. F. Porsche Aktiengesellschaft Rim and method to fabricate
JPH08253002A (en) * 1995-03-20 1996-10-01 Chuo Seiki Kk Two-piece aluminum wheel for automobile and its manufacture
NO954273D0 (en) * 1995-10-26 1995-10-26 Norsk Hydro As Wheels Wheel
JP2000203201A (en) * 1999-01-14 2000-07-25 Topy Ind Ltd Vehicular wheel and manufacture thereof
JP5412363B2 (en) * 2010-04-21 2014-02-12 トピー工業株式会社 Vehicle wheel manufacturing method
JP5857784B2 (en) * 2012-02-20 2016-02-10 日産自動車株式会社 Vehicle wheel

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