JP4682114B2 - Automotive wheel - Google Patents

Description

  The present invention relates to an automobile wheel, and more particularly to an automobile wheel such as a large bus or a large truck.

  A wheel used in an automobile is generally composed of a rim on which a tire is assembled and a disk attached to a vehicle body. Since the wheel affects the driving stability, driving / control performance, and riding comfort of the automobile, various performances such as sufficient strength and light weight are required. The space composed of rims and discs becomes a brake space, but in recent years, further improvement in braking force has been demanded, and there is also a demand to secure sufficient brake space and increase the degree of freedom in designing the brake shape. is there.

  FIG. 3 is a sectional view of a rim of an automobile wheel, and FIGS. 4 to 6 are partial sectional views showing examples of the automobile wheel.

  As shown in FIGS. 3 and 4, the rim 022 of the conventional automobile wheel includes, for example, a first flange 04A, a first bead seat (also referred to as “short bead seat”) 05A, a ledge 060, and a first. It includes a side wall 07A, a drop 080, a second side wall 07B, a second bead sheet (also referred to as “long bead sheet”) 05B, and a second flange 04B.

  As the rim 022, a rolled steel sheet having a uniform thickness wound in a coil shape is usually used, and the shape of each part is formed by roll forming the steel sheet.

  As shown in FIG. 4, a conventional automobile wheel 012 is, for example, a disc 032 having a flange attached to the inner surface of a drop 080 of a rim 022. In addition, as shown in FIG. 5, there is also an automobile wheel 013 in which the flange of the disk 033 is attached to the ledge 060 of the rim 022. These automobile wheels are manufactured under the same offset conditions.

  The vehicle wheel 013 shown in FIG. 5 is lighter because the disk flange can be made smaller than the vehicle wheel 012 shown in FIG. 4 under the same offset condition, and the space on the inner surface side of the rim is increased. This increases the brake space.

  The joining of the flange of the disk 032 and the drop 080 of the rim 022 and the joining of the flange of the disk 033 and the ledge 060 of the rim 022 are usually performed by all-around welding or intermittent welding.

  In Patent Document 1, as an automobile wheel using a rim manufactured from a steel plate having a uniform thickness, “the inner peripheral bead sheet portion is fitted to the inner bead seat portion of the drop center rim, and the inner bead seat portion and the disc are fitted. An automotive wheel having a structure in which an outer peripheral end portion is welded and assembled, wherein the disk has a bent bending portion formed in the outer peripheral end portion in the axial direction of the wheel. .

  In Patent Document 2, as a rim in which the thickness of each part of the rim is changed by using a shape steel or the like, a “large and medium-sized tubeless wheel including a flange part, a disk fitting part, a drop part, a bead seat part, and a sidewall part is used. In the rim for use, when the thickness of the disk fitting portion is 1, the flange portion is 1.0 to 1.2, the drop portion is 0.81 to 0.92, and the bead sheet portion is 0.69 to 0.73. The rim for a large and medium-sized tubeless wheel, characterized in that the sidewall portion is configured with a plate thickness ratio of 0.7 to 0.75.

  Patent Document 3 states that “a rolled section steel is used as a raw material, and a flange part A, a short bead sheet part, and a rim shaft core that is formed on the outer side in the axial direction of the part where the flange part A and the short bead sheet part intersect. Thick angular portion, sidewall portion A, drop portion, sidewall portion B having a flat rim flange surface extending in the direction and a bead seat vertical surface extending in a direction parallel to the rim axis formed radially inward of the portion Rim portion, long bead seat portion, flange portion B, rim flange flat surface extending in the direction perpendicular to the rim axis formed on the outside in the axial direction of the portion where the flange portion B and the long bead seat portion intersect, and the portion A thin-walled angular portion having a bead seat vertical surface extending in a direction parallel to the rim axis formed on the radially inner side of the The thickness of the thick angular portion of the rim is made thicker than the thickness of the thin angular portion, and the length of the bead seat vertical surface of the thick angular portion is set to the bead seat vertical surface of the thin angular portion. The wheel for large automobiles, which is formed longer than the above-mentioned length, has a disc outer peripheral portion fitted to the bead sheet vertical surface of the thick-walled angular portion, and is welded and joined to the bead sheet vertical surface and the disc outer peripheral end portion. ing.

  FIG. 6 shows the shape of the wheel disclosed in Patent Document 3. This wheel has angular portions 09A and 09B, and a disk is attached to the angular portion 09A.

JP-A-10-297201 Japanese Patent Laid-Open No. 11-59107 JP 11-278001 A

  For example, as shown in FIG. 2 of Patent Document 1, the wheel disclosed in Patent Document 1 has insufficient welding between the rim and the disk, is liable to crack, and has sufficient strength as an automobile wheel. I can't get it. In addition, using a shape steel like the rims disclosed in Patent Documents 2 and 3, it requires cost for forming the shape steel, requires a special device to form and join the rim into a tube, welding The later surplus portion requires a large amount of cost, such as a trimming process different from the conventional one. Also, with such an apparatus, it becomes difficult to flexibly cope with a wheel shape design change.

  The present invention has been made to solve these problems, and is an automobile wheel that is light in weight and can secure a brake space on the premise that a rim is manufactured from a rolled coil having a uniform plate thickness. The purpose is to provide.

The present invention is summarized as a wheel for large automobile shown in below.

(1) An automobile wheel having a disk and a rim formed by roll forming from a rolled steel plate having a uniform thickness, wherein the rim includes a first flange, a first bead seat, a ledge, and a first rim. A side wall, a drop, a second side wall, a second bead sheet and a second flange, and the inner surface of the first and / or second bead sheet has a rim axis in a cross section including the rim axis. The outer peripheral portion of the disk is joined to the joint surface, and the outer peripheral surface of the joint surface is between the first flange and the ledge or the second flange and recess is provided between the second side wall, a metal winding Supplementary body is formed by welding the recess, the self characterized in that it forms a tapered surface Car wheel.

  According to the present invention, the disk side wall length can be shortened without changing the offset in spite of the rim manufactured from the rolled coil having a uniform plate thickness, so that significant weight reduction and securing of the brake space can be achieved. As a result, a large automobile wheel with a high degree of design freedom can be obtained.

  1 and 2 are schematic views illustrating an automobile wheel of the present invention.

  As shown in FIG. 1, the vehicle wheel 010 of the present invention has a disk 030 and a rim 020 made of a rolled steel plate. The rim 020 includes a first flange 04A, a first bead sheet 05A, a ledge 060, a first sidewall 07A, a drop 080, a second sidewall 07B, a second bead sheet 05B, and a second flange. 04B. In the example shown in FIG. 1, the inner surface of the first bead sheet 05A has a joint surface 110 represented by a line segment parallel to the rim 020 axis in the cross section including the axis of the rim 020. The outer periphery of the flange 120 is joined to the joint surface 110.

  In the cross-sectional view shown in FIG. 1, the joint surface 110 and the ledge 060 are shown on the same line, but the shape is not limited thereto. For example, a step may be provided between the joint surface 110 and the ledge 060.

  In the example shown in FIG. 2, the joint surface 111 is provided on the inner surface of the second bead sheet 05B of the rim 021 of the automobile wheel 011 of the present invention. Similar to the above example, the outer peripheral portion of the flange 121 of the disk 031 is joined to the joint surface 111.

  The rims 020 and 021 of the automobile wheels 010 and 011 of the present invention are each made of a rolled steel plate having a uniform thickness, and are manufactured by roll forming after the rolled steel plate is formed into a tubular shape. Here, the rolled steel sheet having a uniform thickness means that the thickness is measured by a laser displacement sensor, a micrometer, or the like at a total of five locations of both ends in the width direction of the rolled steel sheet, 1/4, 1/2 and 3/4. , (Maximum thickness−minimum thickness) / maximum thickness × 100 means a rolled steel sheet having 5% or less.

  The rim used for the wheel of the present invention is cheaper and easier to manufacture than the rim using the shape steel disclosed in Patent Documents 2 and 3 in that a rolled steel plate is used. Further, the wheel of the present invention achieves a significant weight reduction even when the offset is the same as that of the wheel shown in FIGS. 4 and 5 using a rolled steel plate having a uniform thickness, even if the offset is the same. Moreover, a large brake space can be taken. Furthermore, since the joining of the rim and the disk in the wheel of the present invention is performed on a wider surface than the wheel shown in FIG. 6, the joining strength does not become insufficient.

  Here, the rim bead sheets 05A and 05B are designed to have a shape similar to that of a tire bead sheet. Thereby, the air pressure to be filled is maintained. Therefore, in the example shown in FIG. 1, it is desirable to attach the wound body 100 having the same shape as the original bead sheet 05 </ b> A on the outer peripheral side of the joint surface 110. In the example shown in FIG. 2, it is desirable to attach the wound body 101 having the same shape as the original bead sheet 05 </ b> B to the outer peripheral side of the joint surface 111. Thereby, an air leak can be prevented more reliably.

  The original bead sheet means the shape of the wheel bead sheet required by the user, and is typically a shape having a taper angle of 15 ° ± 1 °.

  The material of the wound body is not particularly limited. For example, thermoplastic resin such as polypropylene (PP), polyethylene resin (PE), ABS resin, glass fiber reinforced resin such as polyphenylene sulfide (PPS), carbon fiber reinforced A plastic such as a thermoplastic resin of a mold, a metal such as rubber, steel, aluminum, an aluminum alloy, magnesium, and a magnesium alloy can be used. In particular, it is desirable to use a heat-resistant synthetic resin that is inexpensive, has a small specific gravity, and has a high thermal deformation resistance. However, in the case of a wheel having a large mass such as a wheel for a large automobile, even if it is a metal winding body, it is only a 2-3% weight increase and does not become a big problem.

  Although there is no restriction | limiting in particular in the attachment method of a winding body, For example, the following method is employable.

  In the case of a plastic winding body, for example, (1) a half-wrapping body (semi-circular winding body) is prepared and attached in the circumferential direction of the rim, followed by ultrasonic welding, heat (2) Applying adhesive to the rim winding attachment surface and fixing the halved winding attachment, (3) Attaching the mold to the rim and injection molding the resin Thus, a method of mounting a seamless winding body can be employed. In addition, the wound body joint is provided with a perforated portion at one end of the wound body and a projecting portion at the other end. After winding around the rim, the projecting portion and the perforated portion are joined together, and then the joined portion is formed by heat treatment. An integrated method can also be adopted.

  In the case of a rubber wound body, in addition to the above method, (1) a method in which a rubber material is melted, poured into a rim mold, solidified, and (2) a rubber ring is prepared. For example, a method of fixing with an adhesive can be employed.

  In the case of a metal material such as steel, a method of producing a half-shaped wound body by roll rolling or the like and fixing it by spot welding or the like can be employed. In the case of non-ferrous metals, (1) a method of producing a half-shaped wound body by roll rolling, etc., and fixing this by a fusion welding method such as TIG welding, (2) a half-shaped winding For example, a method of fixing the body with an adhesive can be employed.

  In addition, in the case of a metal wound body, a method of filling the depressed portion by overlay welding can be employed. As a welding method, for example, a welding method such as TIG welding, plasma welding, laser welding, MAG welding in which cold wire or hot wire is fed and build-up welding, submerged arc welding, or the like can be used.

  For example, the wound body may have a structure in which three or more cuts are made in the inner peripheral portion and the diameter can be increased from the rim diameter.

  A JIS SAPH440 hot-rolled steel sheet having a thickness of 6 mm was prepared as a rim material, and a JIS SAPH440 hot-rolled steel sheet having a thickness of 12 mm was prepared as a disk material. The rim material was formed into a tubular shape and then formed into a rim having a cross-sectional shape shown in FIGS. 2, 4 and 5 by roll forming. On the other hand, as for the disk material, a hot rolled steel sheet of SAPH440 was blanked into a round shape and formed into a disk having a cross-sectional shape shown in FIGS. 2, 4 and 5 by spinning.

  The respective rims and discs were assembled by welding all around, and the wheels having the cross-sectional shapes shown in FIGS. 2, 4 and 5 were produced. The wheel size was 19.5 inches (49.53 cm) in outer diameter and 6.75 inches (17.15 cm) in rim width. The wheels having the cross-sectional shapes shown in FIGS. 2, 4 and 5 are referred to as an example of the present invention, a comparative example 1 and a comparative example 2, respectively.

  In the present invention example, a polypropylene resin winding body having a taper angle of 15 ° was attached to the outer peripheral surface of the rim.

  For each of the above wheels, the mass and the degree of freedom in brake design were measured. The degree of freedom in brake design is based on the cross-sectional area of the maximum brake caliper that can be mounted on the wheel of Comparative Example 2 or Comparative Example 1, and the ratio of the cross-sectional area of the maximum brake caliper that can be mounted on the wheel of the present invention is obtained. It was.

  As a result of the measurement, the mass of the present invention example was 26.7 kg, the comparative example 1 was 31.8 kg, and the comparative example 2 was 30.2 kg. In the example of the present invention, a weight reduction of about 16% for Comparative Example 1 and about 12% for Comparative Example 2 was achieved. In addition, the degree of freedom in designing the brake of the example of the present invention was about 1.09 times that of Comparative Example 1 and about 1.14 times that of Comparative Example 2.

  According to the present invention, the disk side wall length can be shortened without changing the offset in spite of the rim manufactured from the rolled coil having a uniform plate thickness, so that significant weight reduction and securing of the brake space can be achieved. As a result, a large automobile wheel with a high degree of design freedom can be obtained.

The schematic diagram which illustrated the wheel for cars of the present invention Schematic diagram showing an automobile wheel according to another example of the present invention. Cross section of the rim of an automobile wheel Partial sectional view showing an example of a conventional automobile wheel Partial sectional view showing another example of a conventional automobile wheel Schematic diagram of wheel shape disclosed in Patent Document 3

Explanation of symbols

010, 011. Wheels 012, 013, 014 of the present invention. Conventional wheels 020, 021. The rims 022 and 023 of the present invention. Conventional rims 030, 031. Discs 032, 033, 034. Conventional disc 04A. First flange 04B. Second flange 05A. First bead sheet 05B. Second bead sheet 060. Ledge 07A. First sidewall 07B. Second sidewall 080. Drop 09A, 09B. Angular part 100,101. Wraps 110, 111. Joint surfaces 120, 121. Disc flange

Claims (1)

An automotive wheel having a disk and a rim formed by roll forming from a rolled steel plate having a uniform thickness,
The rim has a first flange, a first bead seat, a ledge, a first sidewall, a drop, a second sidewall, a second bead seat and a second flange;
The inner surface of the first or second bead sheet has a joint surface represented by a line segment parallel to the rim axis in the cross section including the rim axis, and the outer peripheral portion of the flange of the disk is joined to the joint surface. And
The outer peripheral surface of the joint surface is provided with a depression between the first flange and the ledge or between the second flange and the second sidewall,
An automotive wheel characterized in that a metal winding body is formed by welding in a depressed portion to form a tapered surface .

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