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WO2020066446A1 - Jante en alliage léger pour véhicule à moteur à deux roues - Google Patents

Jante en alliage léger pour véhicule à moteur à deux roues Download PDF

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Publication number
WO2020066446A1
WO2020066446A1 PCT/JP2019/033753 JP2019033753W WO2020066446A1 WO 2020066446 A1 WO2020066446 A1 WO 2020066446A1 JP 2019033753 W JP2019033753 W JP 2019033753W WO 2020066446 A1 WO2020066446 A1 WO 2020066446A1
Authority
WO
WIPO (PCT)
Prior art keywords
rim
inner diameter
well
bead seat
width direction
Prior art date
Application number
PCT/JP2019/033753
Other languages
English (en)
Japanese (ja)
Inventor
優介 南出
敏寛 山本
知倫 大谷
Original Assignee
大同工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 大同工業株式会社 filed Critical 大同工業株式会社
Publication of WO2020066446A1 publication Critical patent/WO2020066446A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B21/00—Rims
    • B60B21/02—Rims characterised by transverse section
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
    • Y02T10/86—Optimisation of rolling resistance, e.g. weight reduction 

Definitions

  • both the tire beads 9 a and 9 a are in the rim well 5.
  • the remaining tire bead 9a is also mounted on the rim well 5 for a half circumference.
  • the rim 1 has a standard shape conforming to the tire of JATMA (Japan Automobile Tire Association) in a normal motorcycle, but the rim 1 has a bead seat portion 3 and an inner diameter side surface 3a. Since the bead seat portion inner diameter side surface 3a and the well portion inner diameter side surface 5a are connected to each other by a radius surface R1 having a small radius, the bead seat portion inner diameter side surface 3a and the well portion inner diameter side surface 5a are substantially parallel and extend in the width direction. It has an easy structure.
  • the motorcycle rim is one of the unsprung weight parts, and its weight greatly affects the performance of the motorcycle, and the weight reduction leads to the improvement of the effects of other parts such as the suspension.
  • the rim made of a light alloy of Patent Document 1 has an arcuate surface on the inner diameter side surface, and can reduce the adhesion of mud to the inner diameter side surface. Further, although a cavity is formed on the inner diameter side of the bead seat portion to reduce the weight, a mold having a complicated shape having the cavity is required, and the production of the rim is complicated and the cost is increased.
  • the rim made of a light alloy of Patent Document 2 is formed by reinforcing the entire rim by forming a thin basic shape and forming a bulging portion on an outer surface portion which is an easily deformable portion.
  • the bulging portion formed on the outer surface of the connecting portion between the bead seat portion and the well portion (rim base portion) has a groove formed between the bulging portion and the outer surface of the well portion, and when the mud adheres to the groove, the mud is removed. Difficult and firm mud increases the weight of the rim and disrupts the rotational balance of the rim.
  • a plurality of bulges are formed on the outer surface of the rim over the entire circumference, making the rim appearance odd and complicating polishing in the rim processing step.
  • the present invention provides a rim made of a light alloy for a two-wheeled vehicle, which can be relatively easily manufactured in a simple shape, secures the rigidity of the rim, reduces the weight, and reduces mud sticking to the inner side surface.
  • the purpose is to provide.
  • the step portion (16) has a first radius surface (R2) connected to the bead seat portion (13) and a second radius surface (R3) connected to the well portion (15),
  • the well portion (15) has an arc surface having a predetermined radius (R4)
  • the inner diameter side surface (15a) of the well portion is formed of a curved surface
  • the inner diameter side surface (17) of the bead seat portion includes a smooth curved surface (R5) connecting the inner diameter side corner portion (19) on the width direction outside of the flange portion and the inner diameter side surface (15a) of the well portion,
  • the curved surface has a tangent (j) inclined in the radial direction toward the center in the width direction over its entire length.
  • the step portion (16) has a first radius surface (R2) connected to the bead seat portion (13) and a second radius surface (R3) connected to the well portion (15),
  • the well portion (15) has an arc surface having a predetermined radius (R4),
  • the inner diameter side surface (15a) of the well portion is formed of a curved surface,
  • An inner diameter side surface (17 ') of the bead seat portion includes a straight surface (S) connecting the inner diameter side corner (19) of the flange portion on the outer side in the width direction and the inner diameter side surface of the well portion. , Which are inclined in the inner diameter direction toward the center in the width direction over the entire length.
  • the curved surface of the inner diameter side surface of the bead seat portion is located at a center (O4) outside a vertical line (P) from the widthwise inner end (h) of the inner diameter side corner portion (19), and the well portion (15). ) Of the arc surface having a radius (R6) smaller than the predetermined radius (R4).
  • the bead seat portion and the well portion are each formed of a stepped portion having the two radius surfaces extending substantially in the radial direction, and the tangential line of the bead seat portion has a tangential line toward the center in the width direction.
  • the rim has high rigidity against the load acting on the flange and bead seat from the tire, and together with these, the rigidity of the rim is high and the weight can be reduced as a thin-walled structure. it can.
  • the inner side surface of the bead seat portion is inclined outward in the width direction, even if mud adheres to the inner side surface of the rim, the mud is scattered outward by centrifugal force, and the mud is Reduction in rim performance due to adhesion can be reduced.
  • the flange portion has a rising angle ⁇ 2 of a large angle (close to a right angle) of 0 to 10 degrees, and in combination with the improvement of the rigidity and the weight reduction of the rim described above, it is possible to reduce the possibility of the flange portion being opened and deformed. In addition, it is possible to reduce the weight by thinning and to reduce the height of the flange portion.
  • FIG. 4 is a cross-sectional view of a light alloy rim for a motorcycle according to the related art.
  • the light alloy rim 11 for a two-wheeled vehicle is formed from a solid aluminum alloy mold, and has flange portions 12 erected on both sides and a substantially flat width inward from the base of the flange portion.
  • the rim has a bead seat portion 13 extending in the horizontal direction and a well portion 15 recessed in the rim inner diameter direction in a middle portion of the rim in the width direction.
  • the well portion 15 refers to a surface on the tire side.
  • a number of spokes are stretched with nipples between the well portion 15 and a hub (not shown), a tire is mounted on the bead seat portion 13, and a motocross or the like is mounted.
  • the wire spoke wheel of the competitive motorcycle is formed. Further, the rim 11 is mounted on the tire in the same procedure as that shown in FIG.
  • the arc surface R6 connects the width direction inner end h of the inner diameter side corner portion 19 formed of the radius surface R7 on the outer surface of the flange portion 12 and the width direction outer end i of the arc surface R5 of the well portion inner diameter side surface 15a. All the tangents j of the entire length of the arc surface R6 are inclined surfaces inclined in the rim inner diameter direction toward the center in the width direction.
  • the step 16 has the two round surfaces R2 and R3, the rising angle at the step is large, the rigidity of the flange is increased, and the maximum principal stress is reduced.
  • the arc surface of the well 15 is also increased, and the concentration of stress generated at the bottom of the well is reduced.
  • the maximum stress value decreases, the deformation amount also decreases, the rigidity of the flange portion 12 increases, and the rim can be reduced in weight.
  • the ratio (p / q) of the thickness p at the top of the first round surface R2 of the step portion 16 to the thickness q at the concave portion of the second round surface R3 is in the range of 1.2 to 2.0. Is set to Thus, it is possible to reduce the weight of the rim as much as possible while maintaining the rigidity of the rim at a predetermined value.
  • the flange portion 12 has a width-direction inner surface 12a in contact with the outer surface of the tire bead, and a vertical surface rising at right angles to the bead seat portion 13.
  • the width-direction outer surface 12b is substantially the same as the inner surface 12a. Stand up in parallel.
  • the opening angle ⁇ 2 of the outer surface with respect to the inner surface 12a of the flange portion 12 is 0 to 5 degrees, the flange portion 12 rises substantially vertically with a substantially constant thickness m, is relatively thin, and is high with respect to the load. Has strength.
  • the opening angle ⁇ 2 is in the range of 0 to 10 degrees, the rigidity of the rim 11 is maintained.
  • the height G of the flange portion 12 is not affected by the open deformation as shown by the chain line in FIG. High stress (drag). Thereby, the small opening angle ⁇ 2 (0 to 10 °) of the flange portion 12, the gradually increasing thickness k by the inner side surface 17 of the bead seat portion, the smooth well portion 15 having a large radius, and the like are combined to form the flange portion 12. Height G can be made lower than before.
  • the flange portion height dimension G is changed from 12 [mm] in the conventional rim to 10.0 [mm] or 10.5 [mm].
  • the conventional rim can be changed from 14 [mm] to 12.0 [mm] or 12.5 [mm].
  • the well portion 15 has a step portion 16 but has a smooth (large radius) arc surface R4, and the depth H from the bead seat portion 13 to the bottom surface of the well portion 15 is smaller than that of the conventional rim 1. ing.
  • the conventional rim 1 has a depth of 8.0 [mm]
  • the rim 11 has a depth of 7.0 [mm] or
  • the nominal rim width is 6.5 [mm] and the nominal rim width is 1.85, 2.15 and 2.50 [inch]
  • the conventional rim 1 is 9 [mm]
  • the present rim 11 is It can be 7.5 [mm] or 8.0 [mm].
  • the dimensional ratio G / H of the height G to the depth H becomes smaller than that of the conventional rim 1. It is approximately equivalent to 1.5 to 1.6, so that the tire bead 9a can easily go over the flange portion over the entire circumference in step 3 described above with reference to FIG. Can be.
  • the height G of the flange portion 12 may be the same as that of the conventional rim 1.
  • the depth H of the well portion 15 is formed of a smooth circular arc surface R4 and remains shallow, the dimensional ratio G / H between the flange height G and the depth H is 1.6 to 2.5. Range.
  • the depth H of the well portion 15 is small, so that the tire bead 9a moves away from the center O1 of the rim.
  • the rim 11 has a step portion 16 having a drop d immediately after the widthwise inner end e of the bead seat portion 13, and the tire bead 9a received by the well portion 15 at the point A in FIG. Is located near the drop d of the step portion 16 where the depth becomes steep, and while the tire 9 is largely tilted, the tire bead 9a is passed over the flange portion 12 near the step portion, and both tire beads 9a, 9a are in the well portion 15. Accepted to. As described above, even if the ratio G / H is a relatively large value of 1.5 to 2.5, the tire can be mounted on the rim 11.
  • the rim 11 is formed by cutting a solid aluminum alloy material having a predetermined shape, which has been drawn or extruded, into a predetermined length, formed into a circular shape by bending, and joined by welding or the like. Then, the surface of the rim 11 including the weld joint surface is polished and finished. In the finishing step, the inner diameter side surfaces 15a and 17 of the rim 11 are formed of the smooth circular arc surfaces R5 and R6, so that the rim 11 can be easily and reliably polished, and the high quality light alloy rim 11 can be obtained. As described above, the present rim 11 can be relatively easily manufactured at low cost by using a solid mold.
  • the rim 11 has a rising angle ⁇ 2 of the flange portion 12, a gradually increasing wall thickness k formed by the smooth arc surface R6 of the bead seat inner diameter side surface 17, and a well portion 15 formed by the smooth arc surfaces R4 and R5. And the well portion inner diameter side surface 15a, while maintaining the same strength and rigidity as or more than that of the conventional rim 1, and making the shape and rigidity of the shallow well portion 15 and the flange portion 12 thinner, thereby relatively reducing the thickness.
  • a large amount (for example, 50 g) can be reduced in weight. Further, when the height G of the flange portion 12 is reduced, further weight reduction can be achieved.
  • FIG. 2 shows a partially modified embodiment.
  • the inner side surface of the bead seat portion is changed, and the same portions as those in the previous embodiment are denoted by the same reference numerals and description thereof is omitted.
  • the inner diameter side surface 17 ′ of the bead seat portion 13 has a straight surface S.
  • the straight surface S connects the end h of the round surface R7 of the outer surface inner diameter side corner 19 of the flange portion 12 and the end surface i of the arc surface R5 of the well inner diameter side surface 15a, and faces the center in the width direction over the entire length. And a predetermined gradient a inclined toward the inner diameter side.
  • the light alloy rims 11 and 11 ' are applied to a front wheel or a rear wheel of a motorcycle for competition such as a motocross motorcycle.
  • the rim 11 constitutes a part of the unsprung weight, and the reduction in the unsprung weight has an effect of 4 to 15 times as much as the reduction in the weight of the vehicle body. Even if it is lightweight, it has a great effect on a racing motorcycle.
  • the performance of the suspension also improves, and the performance such as road following and riding comfort also improves.
  • mud may adhere to the inner side surfaces of the rims 11 and 11 'and may be firmly attached by centrifugal force.
  • the bead seat portion inner diameter side surfaces 17 and 17' are inclined in the outer diameter direction toward the outside over the entire length. , 17 'are scattered outwardly without clinging.
  • the mud sticks to the inner side surface of the bead seat portion, and it is possible to reduce an increase in weight due to the mud and a decrease in rim performance due to an uneven load.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)

Abstract

Une section étagée (16) ayant deux surfaces arrondies (R2, R3) et ayant une différence (d) de niveau est disposée entre une section de siège de talon (13) et une section de puits (15). La surface côté diamètre intérieur (17) de la section de siège de talon est formée sous la forme d'une surface arquée circulaire (R6) ou d'une surface droite et est inclinée sur toute la longueur de celle-ci dans une direction de diamètre intérieur vers le centre dans une direction de largeur.
PCT/JP2019/033753 2018-09-26 2019-08-28 Jante en alliage léger pour véhicule à moteur à deux roues WO2020066446A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2018-181014 2018-09-26
JP2018181014A JP2020050115A (ja) 2018-09-26 2018-09-26 二輪自動車用軽合金製リム

Publications (1)

Publication Number Publication Date
WO2020066446A1 true WO2020066446A1 (fr) 2020-04-02

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ID=69953122

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Application Number Title Priority Date Filing Date
PCT/JP2019/033753 WO2020066446A1 (fr) 2018-09-26 2019-08-28 Jante en alliage léger pour véhicule à moteur à deux roues

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JP (1) JP2020050115A (fr)
WO (1) WO2020066446A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1166025B (de) * 1960-11-24 1964-03-19 Weinmann & Co K G Leichtmetallfelge mit Einlage aus haerterem Metall fuer Fahrraeder, Mopeds und andere Fahrzeuge
JPS5348073A (en) * 1977-09-22 1978-05-01 Daiei Kogyo Co Ltd Method of fabricating rims made of light alloy
JP2006306123A (ja) * 2005-04-26 2006-11-09 Okiso:Kk スポーク車輪の軽合金製リム
EP1892123A2 (fr) * 2006-08-24 2008-02-27 Bayerische Motoren Werke Aktiengesellschaft Roue à rayons sans chambre à air pour deux roues, en particulier pour motos

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1166025B (de) * 1960-11-24 1964-03-19 Weinmann & Co K G Leichtmetallfelge mit Einlage aus haerterem Metall fuer Fahrraeder, Mopeds und andere Fahrzeuge
JPS5348073A (en) * 1977-09-22 1978-05-01 Daiei Kogyo Co Ltd Method of fabricating rims made of light alloy
JP2006306123A (ja) * 2005-04-26 2006-11-09 Okiso:Kk スポーク車輪の軽合金製リム
EP1892123A2 (fr) * 2006-08-24 2008-02-27 Bayerische Motoren Werke Aktiengesellschaft Roue à rayons sans chambre à air pour deux roues, en particulier pour motos

Also Published As

Publication number Publication date
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