JP2000203203A - Vehicular wheel and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicular wheel with good deflection accuracy and manufacturing method thereof. SOLUTION: A bead seat stiffening ring 30 which continues in a circumferential direction is inserted in an inner periphery of a bead seat part 14b of a rim 10. The rim 10 and the bead seat stiffening ring 30 are weldedly connected to each other. A disk 20 of which an outer periphery part is extended to a tip of a rim flange 15b is connected to both the tip of the flange 15b of the rim 10 and a tip of the bead seat stiffening ring 30 on a rear face of the disk 20 to be assembled to form a wheel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle wheel and a method of manufacturing the same.

[0002]

2. Description of the Related Art As a wheel that values a design, there is a wheel called a full design wheel. The conventional full design wheel has a rim 1 and a disk 7, as shown in FIG. The rim 1 has a drop portion 2 at a central portion, sidewall portions 3a and 3b extending from both ends thereof, drop connecting portions 4a and 4b connecting the drop portion and the respective sidewall portions in an R shape, and respective side portions. Bead seat portions 5a and 5b extending from the wall portions 3a and 3b
And a flange 6 extending from one bead seat 5a.
a. The flange portion extending from the other bead seat portion 5b is cut off after the rim 1 is formed. The disk 7 has a flange 8 on the outer periphery. The flange portion 8 of the disk 7 is cut and formed substantially symmetrically with the flange portion 6a of the rim 1. End 5c of bead seat 5b opposite to side connected to sidewall 3b (end of flange cut off side)
Are abutted against the root of the flange portion 8 of the disk 7 and are welded to the flange portion 8 over the entire circumference for air sealing. In the welding of the bead sheet portion 5b to the flange portion 8, when welding is generally performed from the inside in the radial direction by MAG welding (carbon dioxide gas arc welding) or the like, welding is performed in a narrow space. Also, in MAG welding, a shielding gas is used at the time of welding, so the thickness of the welding torch is large, and since this torch needs to enter a narrow space, the distance from the sidewall portion 3b to the flange portion 8 is increased. And the welding is performed.

[0003]

However, conventional automobile wheels and their manufacture have the following problems. Since the disk 7 is attached to the rim 1 at the end of the bead seat portion 5b of the rim 1 on which the tire bead is seated (the end is small in rigidity), thermal distortion due to welding directly affects the runout accuracy of the wheel. In addition, since the rim 1 is generally formed of a thin plate, it is difficult to cut the shape of the bead sheet 5b after welding in order to increase the wheel runout accuracy. Since it is necessary to cut the vicinity of the outer periphery of the disk 7 into the shape of a rim flange, the disk material becomes thinner in the disk flange portion 8, and the rigidity of the rim 1 including the disk flange 8 does not improve even in a full design. Cutting is performed to reduce the thickness of the flange only, and the other portions remain thick, so that the weight cannot be reduced and the material cost is wasted. Since one end of the molded rim 1 on the side to be joined to the disk 7 is cut off, waste material is generated. Since the bead sheet portion 5b is welded to the flange portion 8 by air sealing and assembling welding, which are shared by arc welding or the like, it is necessary to perform a full circumference welding, and it is necessary to confirm that there is no welding defect leading to air leakage. was there. Since the bead sheet portion 5b is welded to the flange portion 8 in a narrow space, spatter often occurs, and there is often a problem that spatter adheres to the wheel. SUMMARY OF THE INVENTION An object of the present invention is to provide an automobile wheel having a good runout accuracy and a method of manufacturing the same. Another object of the present invention is to provide a vehicle wheel which can be reduced in weight and a method of manufacturing the same, in addition to the above objects. Still another object of the present invention is to provide a vehicle wheel and a method of manufacturing the same, in which, in addition to the above objects, the material is not wasted. Still another object of the present invention is to provide an automobile wheel which is easy to weld and a method of manufacturing the same, in addition to the above objects.

[0004]

The present invention to achieve the above object is as follows. (1) A bead seat reinforcing ring continuous in the circumferential direction is inserted into the inner periphery of the bead seat portion of the rim, and the rim and the bead seat reinforcing ring are joined by welding. A vehicle wheel assembled to a wheel by joining a front end of a flange of the rim and one end of the bead seat reinforcing ring on a back surface of the rim. (2) The vehicle wheel according to (1), wherein the disc is joined to a rim flange tip and one end of the bead seat reinforcing ring by friction welding. (3) A step of inserting a bead seat reinforcing ring continuous in the circumferential direction into the inner periphery of the bead seat portion of the rim and joining the rim and the bead seat reinforcing ring by welding; Joining the front end of the flange of the rim and one end of the bead seat reinforcing ring on the back surface of the disc and assembling the wheel. (4) The method of manufacturing a vehicle wheel according to (3), wherein the disc is joined to a rim flange tip and one end of the bead seat reinforcing ring by friction welding. (5) The bead seat reinforcing ring is formed symmetrically in the width direction and cut and separated at the center in the width direction (3).
Or the method for manufacturing a vehicle wheel according to (4).

In the method of manufacturing the vehicle wheel described in (1) and (2) and the vehicle wheel described in (3) to (5), the rigidity of the cylinder is greater at a portion in the axial direction of the cylinder than at the end. And the bead seat portion is reinforced by the bead seat reinforcing ring, so that the welding deformation of the bead seat portion is smaller than the conventional welding at the end portion of the bead seat, and the runout of the wheel is reduced. The accuracy is improved. In addition, the disk does not need to be cut to join the flange to the rim, and it is not necessary to make the whole thicker, so the disk can be made thinner than before and the weight of the wheel can be reduced. Is possible. Also, in order to abut the disc flange to the rim flange while leaving both rim flanges, after manufacturing the rim on the current rim production line, the rim at the connection between the bead seat part and the flange part of the rim No cutting is required. Therefore,
There is no waste of material for the rim flange. In addition, the joining of the rim flange portion and the disk does not require an air seal, so that welding is facilitated and the inspection thereof is also simplified. Further, the welding between the rim and the bead seat reinforcing ring is performed in a state where the disk is not joined, so that welding can be performed in a wide space, and generation of spatter during welding can be suppressed. Further, even if spatter is generated and adheres to the wheel, the problem is not caused because the disk is covered by the spatter.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, an automobile wheel according to an embodiment of the present invention will be described with reference to FIGS. The vehicle wheel according to the embodiment of the present invention has flange portions 15a, 1
A rim 10 having a rim 10b, a disk 20 extending to the tip of the rim flange 15a, and a bead seat reinforcing ring 30 inserted into the inner circumference of the rim bead seat portion 14b and continuous over the entire circumference in the circumferential direction. . The bead seat reinforcing ring 30 is joined to the rim 10 at one end by welding and joined to the disc 20 at the other end. The outer peripheral end of the disk 20 is joined to the end of the rim flange 15b.

At the center of the rim 10 in the axial direction, there are provided drop portions 11 for dropping one bead of the tire when the tire (not shown) is mounted.
Sidewall portions 13a and 13b are formed continuously. Sidewall portions 13a, 13b and drop portion 1
1 are connected by drop connecting portions 12a and 12b, respectively. Drop connecting parts 12a, 12b
Are formed in an R shape. Side wall section 13
a, 13b from the outer peripheral edge of each bead seat portion 14
a, 14b extend outward in the rim axial direction. A flange portion 15a extends from the outer end of the one bead seat portion 14a in the rim axial direction. The other bead seat portion 14b extends from the flange portion 15b on the side joined to the disk 20. The axial end portion of the outer peripheral portion of the flange portion 15b is shorter in the rim axial direction than the outer peripheral portion of the flange portion manufactured by the conventional rim manufacturing line. The shape of the flange portion 15b is within a range that can be manufactured by a conventional rim manufacturing line, and cutting after molding is unnecessary. Therefore, the rim 10 is not cut off the rim flange at one end unlike the conventional full design wheel. Therefore, there is no waste of material due to cutting off. The thickness of the rim 10 is the thickness of a conventional normal rim.

A decorative hole 24 is provided on the disk 20 radially outside the hub mounting portion 22. Disc 2
Numeral 0 indicates that a hub hole 21 is provided at the radial center of the disk 20, and a hub mounting portion 22 is provided around the hub hole 21. The hub mounting portion 22 is provided with a plurality of bolt holes 23 at equal intervals in the circumferential direction. By inserting a hub bolt (both not shown) extending from the hub into the bolt hole 23 and screwing a hub nut (not shown) into the hub bolt, the wheel is fixed to the hub at the disc 20 site.

At the outer peripheral end of the disk 20, there is provided a disk flange portion 2 which rises radially outward on the outer side in the rim axial direction.
5 are formed, and the design has an appearance similar to that of a conventional full design wheel. That is, since the disk flange portion 25 is formed integrally with the other portion of the disk 20 and is positioned axially outside the flange portion 15b of the rim 10, when the wheel is viewed from the disk 20 side in the axial direction, There is no joint line between the rim 10 and the radially outer end of the disc 20. The disk 20 is not thinly cut to join the flange portion 25 to the rim 10. The thickness of the disc 20 is
The radially inner portion has the same thickness, and is thinner than the thickness of the central portion of the disk of the conventional full design wheel, thereby reducing the weight. The disk flange 25 cooperates with the flange 15b of the rim 10 to form a flange at one end of the wheel. The disk flange portion 25 is joined to the end of the flange portion 15b of the rim 10 by friction welding at the outer peripheral end of the flange on the rear surface side (center side in the rim axis direction).

A cap fitting groove 26 into which a resin wheel cap (not shown) can be fitted, for example, toward the front side of a portion corresponding to the flange portion 15b of the rim 10, preferably toward the inner peripheral side. May be formed by cutting or the like. When the cap fitting groove 26 is formed in the disk 20 toward the inner peripheral side, the wheel cap can be fitted without projecting axially outward from the wheel.

The bead seat reinforcing ring 30 has an annular structure that is continuous in the circumferential direction, and has a bead seat portion 14b.
(Including the case of press-fitting). One end of the bead seat reinforcing ring 30 on the center side in the wheel axis direction is joined to the sidewall portion 13b of the rim 10 by welding, and the other end is joined to the back surface of the disk 20 by friction welding. The thickness of the bead seat reinforcing ring 30 is
About the thickness or less.

The sectional shape of the bead seat reinforcing ring 30 is, as shown in FIGS.
Extends from the center of the rim in the axial direction to the outer side in the axial direction of the side joined to the disc 20 side, substantially along the shape of the inner surface of the bead seat portion 14b, and the inner surface of the bead seat portion 14b is bent at the bent portion 31. Bends in the direction away from the center of the wheel in the radial direction of the wheel and re-bends 32
Then, it is bent substantially at a right angle outward in the axial direction, and extends toward the disk 20 side.

Next, a method of manufacturing a vehicle wheel according to an embodiment of the present invention will be described with reference to FIGS. In the method of manufacturing an automobile wheel according to the embodiment of the present invention, a circumferentially continuous bead seat reinforcing ring 30 is inserted (including press-fit) into the inner periphery of the bead seat portion 14b of the rim 10, and the rim 1
0 and the bead seat reinforcing ring 30 by welding, and thereafter, the disk 20 whose outer peripheral portion extends to the tip of the rim flange portion 15b is formed on the back surface of the disk 20 by:
Joining the front end of the flange portion 15b of the rim 10 and one end of the bead seat reinforcing ring 30 to assemble the wheel.

The joining of the disc 20 with the tip of the rim flange portion 15b and one end of the bead seat reinforcing ring 30 is performed simultaneously by friction welding. Because of friction welding
It can be joined after plating and after painting. As shown in FIG. 4, the bead seat reinforcing ring 30 is preferably formed by cutting a ring 30 ′ having a cross-sectional shape symmetrical in the width direction at the center in the width direction and bisecting it. . By doing so, the bead seat reinforcing ring 30 itself can be formed into a desired shape with high accuracy, regardless of its asymmetric shape in the axial direction.

After the bead seat reinforcing ring 30 is pressed into the inner surface of the bead seat portion 14b, the axially inner end 30a
To the side wall 13b by welding
Then, the bent portion 31 is joined to the inner surface of the bead seat portion 14b by arc welding or the like. The welding at the bent portion 31 is performed by changing the shape of the bent portion 31 to the bead seat portion 1.
4b, the groove is naturally formed, so that it can be performed smoothly. In addition, since welding at the bent portion 31 is performed before joining the disc 20, in the case of arc welding,
When a welding torch (not shown) is inserted from the outside in the axial direction, welding can be performed in a wide space and can be easily performed. The welding between the axial inner end 30a and the bent portion 31 is performed by welding the rim 10 and the bead seat reinforcing member 3.
In order to reduce zero deformation, it is preferable to weld the bent portion 31 after welding the inner end 30a in the axial direction to a degree of tacking. The outer end of the bead seat reinforcing ring 30 in the axial direction is joined to the flange 15b of the rim 10 by friction welding at the same time as the back surface side (center side in the rim axial direction) of the disc flange 25 is joined to the disc 20 by friction welding. Is done. After the rim 10, the disk 20, and the bead seat reinforcing ring 30 are joined, the radially outer peripheral end of the disk flange portion 25 and a portion 25a protruding from the flange 15b of the rim 10 are subjected to friction welding to generate a burr 25b (see FIG. 1). 2
(Dotted line) is cut so as to smoothly contact the shape of the flange 15b.

Since the bead seat reinforcing ring 30 is provided, when joining the flange portion 15b of the rim 10 to the disc flange portion 25 and joining the bead seat reinforcing ring 30 to the disc 20 by friction welding, Rigidity can be easily secured, and holding with a jig (not shown) is easy. Since the bead seat reinforcing ring 30 is welded to the bead seat 14b at an intermediate position in the axial direction on the inner side of the bead seat 14b, the runout accuracy of the wheel is greatly improved as compared with the conventional case, and the bead seat portion 14b is cut after the wheel is assembled. Is possible (because there is no excessive cutting). Disk 20
When the cap fitting groove 26 is formed on the surface of the cap, when the cap (not shown) is mounted on the cap fitting groove 26, the cap can be attached without protruding from the axial direction of the wheel. For this reason, the cap is less likely to be damaged during traveling or the like.

[0017]

According to the automobile wheel of the first and second aspects and the method of manufacturing the automobile wheel of the third, fourth and fifth aspects, the rigidity of the cylinder is greater at the portion in the axial direction of the cylinder than at the end. And the deformation is small, so that the welding deformation of the bead seat part is smaller than the conventional welding at the end of the bead seat, and the bead seat part and the flange part of the rim are reinforced by the bead seat reinforcing ring This improves the runout accuracy of the wheel. Also, since the disk flange is not thinned by cutting, a thinner plate can be used for the entire disk as compared with the related art, so that the weight of the wheel can be reduced. Also, since the disc flange is brought into contact with the rim flange while leaving both rim flanges, it is not necessary to cut off one rim flange as in the case of manufacturing a rim on a conventional rim production line. Can be saved. Further, the welding between the rim and the bead seat reinforcing ring is performed in a state where the disk is not joined, so that welding can be performed in a wide space, and generation of spatter during welding can be suppressed. Further, since the welded portion between the rim and the bead seat reinforcing ring is not visible after joining the disks, there is no problem even if spatter adheres. According to the method for manufacturing an automobile wheel according to the second aspect and the automobile wheel according to the fourth aspect, friction welding is used for joining the disc to the rim and the bead seat reinforcing ring. Since the rigidity of the joint is improved by the bead seat reinforcing ring and the rim, the joint can withstand the pressure welding. According to the method of manufacturing a vehicle wheel according to the fifth aspect, a bead seat reinforcing ring can be manufactured with high accuracy.

[Brief description of the drawings]

FIG. 1 shows an automobile wheel according to an embodiment of the present invention, and after assembly of a method of manufacturing an automobile wheel according to an embodiment of the present invention.
It is a half sectional view.

FIG. 2 is a half sectional view of a method for manufacturing a vehicle wheel according to an embodiment of the present invention when a bead seat reinforcing ring is joined to a rim.

FIG. 3 is a half sectional view of a disc before assembling and joining in the method of manufacturing the vehicle wheel according to the embodiment of the present invention;

FIG. 4 is a half cross-sectional view of a vehicle wheel and a bead seat reinforcing ring used in a method of manufacturing the same according to an embodiment of the present invention;

FIG. 5 is a half sectional view of a conventional automobile wheel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Rim 11 Drop part 13a, 13b Sidewall part 14a, 14b Bead seat part 15a, 15b Flange part 20 Disk 25 Disk flange part 26 Cap fitting groove 30 Bead seat reinforcement ring

Claims (5)

[Claims] A bead seat reinforcing ring continuous in the circumferential direction is inserted into an inner periphery of a bead seat portion of a rim, a rim and the bead seat reinforcing ring are joined by welding, and a disc having an outer peripheral portion extending to a tip of a rim flange is provided. A vehicle wheel assembled to the wheel by joining the front end of the flange of the rim and one end of the bead seat reinforcing ring on the back surface of the disc. 2. The vehicle wheel according to claim 1, wherein the disc is joined to a tip of a rim flange and one end of the bead seat reinforcing ring by friction welding. 3. A step of inserting a circumferentially continuous bead seat reinforcing ring into the inner periphery of the bead seat portion of the rim and joining the rim and the bead seat reinforcing ring by welding, and a disk having an outer peripheral portion extending to the tip of the rim flange. Joining the front end of the flange of the rim and one end of the bead seat reinforcing ring on the back surface of the disk to assemble the wheel. 4. The method for manufacturing an automobile wheel according to claim 3, wherein the joining of the disc to a rim flange tip and one end of the bead seat reinforcing ring is performed by friction welding. 5. The method for manufacturing a vehicle wheel according to claim 3, wherein the bead seat reinforcing ring is formed symmetrically in the width direction and cut and separated at the center in the width direction.