WO2016143533A1 - 車両用ホイール - Google Patents
車両用ホイール Download PDFInfo
- Publication number
- WO2016143533A1 WO2016143533A1 PCT/JP2016/055578 JP2016055578W WO2016143533A1 WO 2016143533 A1 WO2016143533 A1 WO 2016143533A1 JP 2016055578 W JP2016055578 W JP 2016055578W WO 2016143533 A1 WO2016143533 A1 WO 2016143533A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- air chamber
- surface member
- bridge
- auxiliary air
- vehicle wheel
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B21/00—Rims
- B60B21/12—Appurtenances, e.g. lining bands
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- 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
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/172—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using resonance effects
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B2900/00—Purpose of invention
- B60B2900/10—Reduction of
- B60B2900/111—Weight
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B2900/00—Purpose of invention
- B60B2900/10—Reduction of
- B60B2900/112—Costs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B2900/00—Purpose of invention
- B60B2900/10—Reduction of
- B60B2900/113—Production or maintenance time
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B2900/00—Purpose of invention
- B60B2900/10—Reduction of
- B60B2900/133—Noise
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- 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
- the present invention relates to a vehicle wheel.
- Patent Document 1 discloses a plurality of sub air chambers that are attached to an outer peripheral portion of a wheel to which a tire is attached and that are partitioned from each other, and a main body portion that configures a plurality of communication portions that respectively connect the sub air chambers to the air chamber. And a resonator in which a plurality of resonator portions are configured by the respective sub air chambers and the respective communication portions communicating with the sub air chambers.
- an object of the present invention is to provide a vehicle wheel including a sub air chamber member that can suppress the amount of surface deformation even when the internal pressure of the sub air chamber acts.
- the vehicle wheel according to claim 1 is a vehicle wheel having a sub air chamber member as a Helmholtz resonator on the outer peripheral surface of a well portion in a tire air chamber, wherein the sub air chamber
- the member includes an upper surface member disposed on the tire air chamber side, a lower surface member disposed on the outer peripheral surface side of the well portion, and a plurality of bridge portions that associate and combine the upper surface member and the lower surface member.
- the distance between the end portions of the opening portions of the bridge portions opened on the surface of the upper surface member is set longer than the distance to the end portions of the opening portions of the adjacent bridge portions.
- the muffled sound volume can be improved by suppressing the amount of surface deformation when the internal pressure of the sub air chamber member (sub air chamber) is applied.
- the vehicle wheel according to claim 2 is characterized in that the area of the opening of the bridge portion opened on the upper surface of the upper surface member is larger than the areas of other general portions.
- the surface rigidity can be further improved.
- the vehicle wheel according to claim 3 is configured in a fan shape such that the distance between the opposing side surfaces becomes longer as the side surface of the bridge portion approaches the upper surface of the upper surface member.
- the area of the opening portion of the bridge portion that opens to the upper surface of the upper surface member can be increased, and the surface rigidity can be improved.
- the vehicle wheel according to claim 4 is characterized in that in the bridge portion, only the upper surface member is recessed toward the lower surface member and abuts against the lower surface member.
- the area of the opening of the bridge portion can be increased, and the lower surface member does not constitute the bridge portion, so that the resonator volume can be secured.
- auxiliary air chamber member has an insertion portion fitted into the well portion at an end portion, and an end of the opening portion of the bridge portion that is opened on the surface of the upper surface member.
- the inter-part distance is set to be longer than the distance between the end of the opening of the bridge part and the fitting part.
- the volume reduction can be improved by further suppressing the amount of surface deformation when the internal pressure of the auxiliary air chamber member acts.
- a vehicle wheel including a sub air chamber member that can suppress the amount of surface deformation even when the internal pressure of the sub air chamber member acts.
- FIG. 1 is a perspective view of a vehicle wheel according to an embodiment of the present invention. It is a whole perspective view of the sub air chamber member of the wheel for vehicles concerning the above-mentioned embodiment. It is a principal part perspective view of the upper surface of the sub air chamber member seen from the convex side of FIG.
- FIG. 2 is a cross-sectional view showing a sub air chamber member cut along line AA in FIG. 1. It is a principal part enlarged view of the upper surface part of the upper surface member shown to code
- FIG. 8 is a cross-sectional view showing the auxiliary air chamber member cut out along line AA in FIG. 7. It is sectional drawing of the sub air chamber member of a comparative example. It is a principal part perspective view of the lower surface of the sub air chamber member seen from the concave side of FIG. It is typical sectional drawing explaining the difference in volume by comparing the structure of the sub air chamber member of this embodiment, and the structure of the sub air chamber member of a comparative example.
- the vehicle wheel according to the present invention has a secondary air chamber member (helmholtz resonator) that silences road noise caused by air column resonance in the tire air chamber on the outer peripheral surface of the well portion.
- a secondary air chamber member helmholtz resonator
- FIG. 1 is a perspective view of a vehicle wheel 100 according to an embodiment of the present invention.
- the vehicle wheel 100 includes a rim 11 and a disk 12 for connecting the rim 11 to a hub (not shown).
- the rim 11 has a well portion 11c that is recessed toward the inner side (rotation center side) in the wheel radial direction between the bead seat portions 11a and 11a formed at both ends in the wheel width direction Y shown in FIG. is doing.
- the well portion 11c is provided for dropping a bead portion (not shown) of the tire when the rim is assembled to assemble the tire (see FIG. 6).
- the well portion 11c in the present embodiment is formed in a cylindrical shape having substantially the same diameter over the wheel width direction Y.
- reference numeral 11d denotes an outer peripheral surface of the well portion 11c.
- Reference numeral 18 denotes a tubular body in which a communication hole 19 (see FIG. 2) to be described later is formed, and is provided in the auxiliary air chamber member 20.
- Reference numeral 15 denotes an annular vertical wall provided on the outer peripheral surface 11 d of the well portion 11 c so as to extend in the circumferential direction of the rim 11.
- the auxiliary air chamber member 20 Helmholtz resonator
- the symbol X is the wheel circumferential direction.
- FIG. 2 is an overall perspective view of the auxiliary air chamber member 20.
- FIG. 3 is a perspective view of an essential part of the upper surface of the auxiliary air chamber member 20 as viewed from the convex side of FIG. 4A is a cross-sectional view showing the auxiliary air chamber member 20 cut out along the line AA in FIG.
- FIG. 5 is a perspective view of a main part of the lower surface of the auxiliary air chamber member 20 as viewed from the concave side of FIG.
- the auxiliary air chamber member 20 is a member that is long in one direction, and has a hollow main body portion 20 a having an auxiliary air chamber SC (see FIG.
- edge portions 14a and 14b to be engaged with the second vertical wall surfaces 16a and 16b (see FIG. 6).
- the edge portions 14a and 14b are end portions (inserted portions) for fitting into the well portion 11c of the wheel.
- the auxiliary air chamber SC will be described later.
- the auxiliary air chamber member 20 is curved in the longitudinal direction, and is arranged along the wheel circumferential direction X when attached to the outer peripheral surface 11d (see FIG. 1) of the well portion 11c (see FIG. 1). .
- Reference numeral 18 denotes a tubular body that constitutes a part of the main body 20a, and a communication hole 19 that communicates with the auxiliary air chamber SC (see FIG. 4) is formed inside thereof.
- the communication hole 19 of the tubular body 18 extending in the wheel circumferential direction X communicates with the auxiliary air chamber SC on one end side in the wheel circumferential direction X shown in FIG. 4A and opens to the outside on the other end side.
- Reference symbol Y denotes the wheel width direction. The communication hole 19 will be described later.
- the auxiliary air chamber member 20 has a main body 20 a that has a long rectangular shape in plan view and in which an auxiliary air chamber SC (see FIG. 4A) is formed.
- the main-body part 20a the part except the pipe body 18 is exhibiting the elongate rectangular shape by the top view (plan view) shown in FIG.
- the main body portion 20 a of the sub air chamber member 20 has a top surface member 21 and a lower surface member that forms a sub air chamber SC that is one connected space between the upper surface member 21. 22 and a plurality of bridge portions 23 that abut the upper surface member 21 and the lower surface member 22 together.
- the upper surface member 21 faces the tire air chamber and is curved so as to have a bulge above the lower surface member 22 arranged along the outer peripheral surface 11d side of the well portion 11c, thereby forming a sub air chamber SC. ing.
- the upper surface member 21 and the lower surface member 22 are formed of a thick resin member having a thickness d.
- each of the resin material which comprises the upper surface member 21 and the lower surface member 22 in this embodiment is the same thickness, these thicknesses may mutually differ.
- the bridge portion 23 constitutes a bridge portion (see FIG. 4A) in which the upper surface member 21 and the lower surface member 22 are abutted and partially coupled.
- the bridge portion 23 is formed such that the upper surface member 21 is recessed toward the lower surface member 22 side, and the tip end portion of the recess hits the lower surface member 22, where it is integrated with the lower surface member 22 to form the upper surface member. It is formed by partially joining the member 21 and the lower surface member 22. In this case, it shall have the intensity
- the distance between the end portions of the bridge portion 23 on the upper surface 21 a of the upper surface member 21 is set to be longer than the distance on the upper surface 21 a between the bridge portions 23 (described later with the effect I).
- the definition of the opening 23a of the bridge portion 23 and the description of the distance between the ends of the opening 23a of the bridge portion 23 (symbols A to E in FIG. 4A) will be described later.
- an opening 23a (window portion) formed on the upper surface 21a of the upper surface member 21 has a rectangular or trapezoidal shape in plan view. Further, in the bridge portion 23, the total opening area of the opening portions 23 a of the bridge portions 23 on the upper surface 21 a of the upper surface member 21 is larger than the area of the other general portions (described later with the operational effect II).
- the bridge portion 23 is configured in a fan shape having an inverted C shape so that the distance between the bridge side surfaces 23b becomes longer as the bridge side surface 23b approaches the upper surface 21a of the upper surface member 21 (described later with the operational effect III). To do).
- the bridge portion 23 has a configuration in which only the upper surface member 21 is recessed toward the lower surface member 22 and abuts against the lower surface member 22.
- the depression of the bridge portion 23 formed on the upper surface 21a of the upper surface member 21 is formed only on the upper surface member 21 side (described later with operational effect IV).
- the opening 23a of the bridge portion 23 can be made larger than the conventional example.
- nine bridge portions 23 are arranged in two rows (18 in total) in the width direction of the main body portion 20 a along the longitudinal direction (wheel circumferential direction X) of the auxiliary air chamber member 20. Is formed.
- the bridge portion 23 in which the upper surface member 21 and the lower surface member 22 are coupled to each other in the auxiliary air chamber SC improves the mechanical strength of the auxiliary air chamber member 20 and also increases the mechanical strength of the auxiliary air chamber SC due to the resonator resonance pressure fluctuation. It is the structure which suppresses the fluctuation
- the auxiliary air chamber member 20 according to the present embodiment as described above is assumed to be a resin molded product.
- a resin a lightweight and highly rigid resin that can be blow-molded is desirable in view of weight reduction, improvement in mass productivity, reduction in manufacturing cost, securing airtightness of the sub air chamber SC, and the like.
- polypropylene that is resistant to repeated bending fatigue is particularly desirable.
- the volume of the auxiliary air chamber SC is desirably about 50 to 300 cc.
- the auxiliary air chamber member 20 Helmholtz resonator
- the length of the auxiliary air chamber member 20 in the wheel circumferential direction X is half of the circumferential length of the rim 11 (see FIG. 1) (the circumferential length of the outer peripheral surface 11d of the well portion 11c). The length can be maximized and set appropriately in consideration of adjustment of the weight of the vehicle wheel 100 and ease of assembly to the well portion 11c.
- the communication hole 19 provided in the auxiliary air chamber member 20 is formed between the tire air chamber MC and the tire (not shown) on the well portion 11 c (see FIG. 1). (See FIG. 6) and the auxiliary air chamber SC are communicated with each other.
- the cross-sectional shape of the communication hole 19 is not particularly limited, and may be any of an elliptical shape, a circular shape, a polygonal shape, a D shape, and the like.
- the diameter of the communication hole 19 is desirably 5 mm or more when the cross section is circular.
- the communication hole 19 having a cross-sectional shape other than a circle preferably has a diameter of 5 mm or more in terms of a cross-sectional area converted to a circle having the same cross-sectional area.
- the length of the communication hole 19 is set so as to satisfy the equation for obtaining the resonant vibration frequency of the Helmholtz resonator shown by the following (Equation 1).
- f 0 C / 2 ⁇ ⁇ ⁇ (S / V (L + ⁇ ⁇ ⁇ S)) (Expression 1)
- f 0 (Hz): resonance vibration frequency C (m / s): sound velocity inside the sub-air chamber SC ( sound velocity inside the tire air chamber MC)
- the resonance vibration frequency f 0 is The resonance vibration frequency of the tire air chamber MC is adjusted.
- each of the edge portions 14 a and 14 b of the auxiliary air chamber member 20 extends from the main body portion 20 a toward the short direction (wheel width direction Y) of the auxiliary air chamber member 20. These edge portions 14a and 14b lock the auxiliary air chamber member 20 to the well portion 11c (see FIG. 1). The edges 14a and 14b will be described later.
- a bead 24 is formed on the lower surface member 22. As shown in FIG. 5, the bead 24 is formed such that the lower surface member 22 is partially depressed toward the upper surface member 21. As shown in FIG. 4A, the bead 24 in the present embodiment extends in the width direction of the auxiliary air chamber member 20 (wheel width direction Y). The bead 24 increases the surface rigidity of the lower surface member 22.
- FIG. 6 is a partial cross-sectional view of the vehicle wheel according to the present embodiment showing the positional relationship between the auxiliary air chamber member 20 attached to the well portion 11c, the hump portion, and the vertical wall.
- the symbol SC is a sub air chamber
- the symbol MC is a tire air chamber formed between the tire 30 and the well portion 11c.
- the edge portion 14a and the edge portion 14b are formed so as to extend in the wheel width direction Y from the main body portion 20a formed by the upper surface member 21 and the lower surface member 22, as described above. .
- edge part 14a is extended toward the 1st vertical wall surface 16a from the main-body part 20a, and the front-end
- edge part 14b is extended toward the 2nd vertical wall surface 16b from the main-body part 20a, and the front-end
- the groove portions 17a and 17b are formed by machining each of the vertical wall 15 and the side surface portion 11e.
- edge portion 14a and the edge portion 14b extending toward the first vertical wall surface 16a and the second vertical wall surface 16b are integrally formed with the curved lower surface member 22 so as to protrude toward the outer peripheral surface 11d side of the well portion 11c. Forming a curved surface. And these edge parts 14a and 14b have spring elasticity which resists a centrifugal force by selecting the thickness and material suitably.
- the rim 11 includes a bead seat portion 11 a formed at both ends in the wheel width direction Y, and a rim bent in an L shape from the bead seat portion 11 a toward the outer side in the wheel radial direction Z.
- the flange portion 11bd and the well portion 11c recessed in the wheel radial direction between the bead seat portions 11c are provided.
- the bead seat portion 11 a is provided to drop the bead portion 30 a of the tire 30 when the rim is assembled to the tire 30. And the bead sheet
- seat part 11a has the hump part 11f which swelled the wheel radial direction outer side in front of recessing in the well part 11c.
- the height of the top portion of the vertical wall 15 from the outer peripheral surface 11d of the well portion 11c is the hump portion on the second vertical wall surface 16b side from the outer peripheral surface 11d of the well portion 11c. It is set to be lower than the height of the top of 11f.
- the resonator for a vehicle wheel described in Patent Document 1 has a rib shape on the upper surface in order to ensure rigidity.
- the surface of the general part away from the bridge is generated on the upper surface, that is, the volume of the auxiliary air chamber SC is changed, so that a sufficient silence level cannot be obtained.
- the problem of the configuration in which the bridge is provided and the operational effect of the sub air chamber member 20 of the present embodiment that solves the problem will be described in comparison.
- FIG. 7 is an overall perspective view of the auxiliary air chamber member 120 of the comparative example.
- FIG. 8 is a cross-sectional view showing the auxiliary air chamber member 120 cut along line AA in FIG.
- the auxiliary air chamber member 120 (Helmholtz resonator) of the comparative example has a lower surface in which the main body portion 120 a forms the auxiliary air chamber SC between the upper surface member 121 and the upper surface member 121.
- a member 122 and a plurality of bridge portions 123 that butt-join the upper surface member 21 and the lower surface member 22 are provided. As shown in FIG.
- the bridge portion 123 is formed such that the upper surface member 121 is recessed toward the lower surface member 122 and the lower surface member 122 is recessed toward the upper surface member 121. That is, in the sub air chamber member 120 of the comparative example, the member 121 and the surface member 122 are recessed from each other and approach each other, and the tip portions thereof are combined to form the bridge portion 123.
- an opening portion 123a formed on the upper surface 121a of the upper surface member 121 and an opening portion 123b formed on the lower surface 122a of the lower surface member 122 have a substantially circular shape in plan view.
- auxiliary air chamber member 120 having the bridge portion 123 surface deformation occurs in the general portion 121b away from the opening portion 123a of the bridge portion 123 on the upper surface 121a of the upper surface member 121 when an internal pressure is generated due to pressure fluctuation of the resonator resonance. There may be a case where a sufficient volume is not obtained.
- the auxiliary air chamber member 20 of the present embodiment has a configuration of a bridge portion 23 in which only the upper surface member 21 is depressed toward the lower surface member 22 side.
- the opening 23a of the bridge portion 23 is formed only on the upper surface member 21 side.
- the area of the opening 23 a of the bridge portion 23 occupies most of the area of the upper surface 21 a of the upper surface member 21 of the auxiliary air chamber member 20.
- the ratio of the area of the opening 23a to the area of the upper surface 21a of the upper surface member 21 of the auxiliary air chamber member 20 is 20 to 80%, in other words, the general part (that is, the opening 23a is not present).
- the area ratio of the upper surface 21a portion is minimal.
- the sub air chamber member 120 is the time of internal pressure generation
- the reason why the sub air chamber member 20 of the present embodiment can adopt the above-described configuration and the effect of the sub air chamber member 20 will be described.
- the action effects can be considered by dividing them into action effects I to III corresponding to the constituent elements.
- the auxiliary air chamber member 20 of the present embodiment is configured such that the distance between the end portions of the opening 23a of the bridge portion 23 on the upper surface 21a of the upper surface member 21 (the finger having the width of the opening 23a).
- the distance between the end portions of the openings 23a of the adjacent bridge portions 23 (the distance between the openings 23a and the general portion between the adjacent openings 23a) (see FIG. 4A).
- C, D, E That is, the auxiliary air chamber member 20 of the present embodiment is A> C, D, E B> C, D, E Configured to be.
- FIG. 4B is an enlarged view of a main part of the upper surface 21a portion of the upper surface member 21 shown by reference signs A and C in FIG.
- the upper surface member 21 and the lower surface member 22 of the sub air chamber member 20 made of resin have a predetermined thickness and a thickness d.
- the upper surface member 21 having this thickness d is recessed toward the lower surface member 122 toward the side, and the auxiliary air chamber SC is formed by the bridge portion 23 where the upper surface member 21 and the lower surface member 122 abut.
- the starting point is defined as the starting point P.
- the auxiliary air chamber member 20 of the present embodiment includes edge portions 14 a and 14 b for fitting into the wheel well portion 11 c at the end portions (insertion portions).
- the distance between the end portions of the opening portion 23a of the bridge portion 23 on the upper surface 21a of the upper surface member 21 (the handing distance of the width of the opening portion 23a) (symbols A and B in FIG. 4A) is the opening portion of the bridge portion 23. It is set to be longer than the distance to the edge portions 14a and 14b of 23a (reference symbols C and E in FIG. 4A).
- A> C B> E By comprising in this way, the sub air chamber member 20 of this embodiment can suppress the surface deformation amount when an internal pressure acts, and can improve a noise reduction volume.
- the auxiliary air chamber member 20 of the present embodiment is configured with the size of the opening 23a of the bridge portion 23 indicated by reference numeral AE in FIG. 4A, so that the opening portion of the bridge portion 23 is formed as shown in FIG. A configuration is adopted in which the area of 23 a is larger than the area of the general portion of the upper surface 21 a of the upper surface member 21.
- the ratio of the area of the opening 23a to the area of the upper surface 21a of the upper surface member 21 of the auxiliary air chamber member 20 is 20 to 80% (more preferably 50 to 80%). As can be seen by comparing the upper surface 21a of the upper surface member 21 of the auxiliary air chamber member 20 shown in FIG.
- the area of the opening 23a of the bridge portion 23 is considerably larger than the area of the general portion of the upper surface 21a of the upper surface member 21, and the ratio of the area of the opening 23a to the area of the upper surface 21a of the upper surface member 21 of the auxiliary air chamber member 20 is About 70%.
- the opening 23a of the bridge portion 23 is set to the above dimensions (see reference numerals AE in FIG. 4A), the area of the opening 23a of the bridge portion 23 of the upper surface 21a of the upper surface member 21 is the other upper surface member. Needless to say, it can be made larger than the area of the general portion of the upper surface 21a of the 21. However, even when the dimensions are not adopted, the above-mentioned area ratio can be taken.
- the rigidity of the upper surface 21a is further improved by making the area of the opening 23a of the bridge portion 23 of the upper surface 21a of the upper surface member 21 larger than the area of the general portion of the upper surface 21a of the other upper surface member 21. Is possible.
- the bridge portion 123 has a cross section with a minimum bridge draft (a draft angle from a bridge-shaped molding die).
- the side surface portion 23b of the bridge portion 23 is closer to the upper surface 21a of the upper surface member 21 as shown by the symbols ⁇ and ⁇ in FIG.
- the auxiliary air chamber member 20 of the present embodiment has a fan-shaped bridge shape (draft angle 5 to 5) in which the draft angle from the mold having the cross-sectional shape of the bridge portion 23 is more clearly than the draft angle of the comparative example. 45 deg).
- the opening 23a of the bridge portion 23 that opens to the upper surface 21a of the upper surface member 21 of the auxiliary air chamber member 20 is different from the bridge minimum draft section of the comparative example and the bridge sector cross section of the present embodiment.
- the area of (window part) can be enlarged.
- the area of the opening 23a (window) of the bridge portion 23 occupies most of the area of the upper surface 21a of the upper surface member 21 (20 to 80%). With this configuration, the area of the opening 23 a of the bridge portion 23 on the upper surface 21 a of the upper surface member 21 can be increased.
- FIG. 9 is a cross-sectional view of the auxiliary air chamber member 120 of the comparative example.
- FIG. 10 is a perspective view of a main part of the lower surface of the auxiliary air chamber member 120 as viewed from the concave side of FIG.
- the member 121 and the surface member 122 are recessed from both directions and approach each other, and the tip portions thereof are combined to form a bridge portion 123.
- the bridge portion 123 has an opening 123 a formed on the upper surface 121 a of the upper surface member 121 and an opening 123 b formed on the lower surface 122 a of the lower surface member 122.
- the auxiliary air chamber member 20 of the present embodiment has a configuration of a bridge portion 23 in which only the upper surface member 21 is depressed toward the lower surface member 22 side.
- the opening 23a of the bridge portion 23 is formed only on the upper surface member 21 side.
- the opening 23 of the bridge portion 23 opens only on the upper surface 121 a of the upper surface member 121.
- the configuration of the bridge unit 23 of the present embodiment is compared with the configuration of the bridge unit 123 of the comparative example. In the configuration of the bridge portion 123 of the comparative example, as indicated by reference numerals D11 and D12 in FIG. 9, the bridge portion 123 is located in the middle of the top and bottom surfaces. The distance to the upper surface 121a is small (the depth is shallow).
- the auxiliary air chamber member 20 of the present embodiment has a bridge portion 23 configuration in which only the upper surface member 21 abuts against the lower surface member 22 as indicated by reference numerals D1 and D2 in FIG. Can be increased.
- D1> D11 D2> D12 thereby, the fan-shaped area of the bridge part 23 can be increased, and surface rigidity can be improved.
- FIG. 11 is a schematic cross-sectional view illustrating the difference in volume by comparing the configuration of the sub air chamber member 20 of the present embodiment and the configuration of the sub air chamber member 120 of the comparative example.
- the capacity can be increased by the shaded area of FIG. 11 as compared with the configuration of the bridge portion 123 of the comparative example.
- the bridge portion 23 configuration from one side of this embodiment, it is possible to increase the area of the bridge portion 23 from both the upper and lower sides and improve the surface rigidity, and the lower surface member 122 has a bridge portion. Since 23 openings are not formed, the resonator volume can be secured.
- a large volume of the auxiliary air chamber SC can be secured.
- the auxiliary air chamber member 20 has a configuration in which one Helmholtz resonator is provided.
- the auxiliary air chamber member of the vehicle wheel of the present invention has a plurality of diagonal lines at the center of the rim 11.
- a Helmholtz resonator may be formed.
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Abstract
Description
特許文献1には、タイヤが取り付けられたホイールの外周部に取り付けられるとともに互いに区画された複数の副気室及びこれら副気室をそれぞれ前記空気室に連通する複数の連通部を構成する本体部を備え、前記各副気室及びこれら各副気室に連通する前記各連通部により複数のレゾネータ部が構成されたレゾネータが記載されている。
以下では、車両用ホイールの全体構成について説明した後に、副気室部材について詳細に説明する。
図1に示すように、車両用ホイール100は、リム11と、このリム11をハブ(図示省略)に連結するためのディスク12とを備えている。
リム11は、図1に示すホイール幅方向Yの両端部に形成されるビードシート部11a,11a同士の間で、ホイール径方向の内側(回転中心側)に向かって凹んだウェル部11cを有している。
図1中、符号11dは、ウェル部11cの外周面である。符号18は、後記する連通孔19(図2参照)が形成される管体であり、副気室部材20に備えられている。符号15は、リム11の周方向に延びるようにウェル部11cの外周面11dに設けられる環状の縦壁である。ちなみに、副気室部材20(ヘルムホルツレゾネータ)は、後記するように、縦壁15に係止される。なお、図1中、符号Xは、ホイール周方向である。
次に、副気室部材20について説明する。
図2は、副気室部材20の全体斜視図である。図3は、図2の凸側から見た副気室部材20の上面の要部斜視図である。図4Aは、図1のA-A線で切り欠いた副気室部材20を示す断面図である。図5は、図2の凹側から見た副気室部材20の下面の要部斜視図である。
図2に示すように、副気室部材20は、一方向に長い部材であって、内側に副気室SC(図4A参照)を有する中空の本体部20aと、この本体部20aを第1および第2の縦壁面16a,16b(図6参照)に係止させる縁部14a,14bと、を備えている。縁部14a,14bは、ホイールのウェル部11cにはめ込むための端部(嵌込部)である。なお、副気室SCについては、後記する。
上面部材21および下面部材22は、図4Aに示すように、厚さdの肉厚の樹脂部材で形成される。なお、本実施形態での上面部材21および下面部材22を構成する樹脂材料のそれぞれは、同じ厚さとなっているが、これらの厚さは相互に異なっていてもよい。
副気室SCの容積は、50~300cc程度が望ましい。副気室SCの容積をこの範囲内に設定することで、副気室部材20(ヘルムホルツレゾネータ)は、消音効果を充分に発揮しつつ、その重量の増大を抑制して車両用ホイール100の軽量化を図ることができる。また、ホイール周方向X(図2参照)の副気室部材20の長さは、リム11(図1参照)の周長(ウェル部11cの外周面11dの周長)の2分の1の長さを最大として、車両用ホイール100の重量の調整やウェル部11cに対する組付け容易性を考慮して適宜に設定することができる。
連通孔19の断面形状は、特に制限はなく、楕円形、円形、多角形、D字形状等のいずれであってもよい。連通孔19の直径は、断面が円形の場合には、5mm以上が望ましい。また、円形以外の断面形状の連通孔19は、その断面積で同じ断面積の円形に換算して直径5mm以上のものが望ましい。
f0(Hz):共鳴振動周波数
C(m/s):副気室SC内部の音速(=タイヤ空気室MC内部の音速)
V(m3):副気室SCの容積
L(m):連通孔19の長さ
S(m2):連通孔19の開口部断面積
α:補正係数
なお、前記共鳴振動周波数f0は、タイヤ空気室MCの共鳴振動周波数に合わせられる。
図2に示すように、副気室部材20の縁部14a,14bのそれぞれは、副気室部材20の短手方向(ホイール幅方向Y)に向けて本体部20aから延出している。これら縁部14a,14bは、副気室部材20をウェル部11c(図1参照)に係止するものである。この縁部14a,14bについては後記する。
図4Aに示すように、下面部材22には、ビード24が形成されている。ビード24は、図5に示すように、下面部材22が上面部材21側に部分的に窪んで形成されたものである。本実施形態でのビード24は、図4Aに示すように、副気室部材20の幅方向(ホイール幅方向Y)に延在している。ビード24によって、下面部材22の面剛性を高めている。
図6は、ウェル部11cに取り付けられた副気室部材20と、ハンプ部および縦壁との位置関係を示す本実施形態に係る車両用ホイールの部分断面図である。図6中、符号SCは、副気室であり、符号MCは、タイヤ30とウェル部11cとの間に形成されるタイヤ空気室である。
図6に示すように、縁部14aおよび縁部14bは、前記したように、上面部材21および下面部材22で形成される本体部20aからホイール幅方向Yに延出するように形成されている。そして、縁部14aは、本体部20aから第1の縦壁面16aに向けて延出してその先端が第1の縦壁面16aの溝部17aに嵌り込んでいる。また、縁部14bは、本体部20aから第2の縦壁面16bに向けて延出してその先端が第2の縦壁面16bの溝部17bに嵌り込んでいる。溝部17a,17bは、縦壁15および側面部11eのそれぞれに機械加工を施して形成される。
そして、ビードシート部11aがウェル部11cに窪む手前にホイール径方向外側盛り上がったハンプ部11fを有している。
特許文献1記載の車両用ホイールのレゾネータは、剛性確保のため、上面にリブ形状を有している。また、さらなる剛性確保のために上面と下面とを突き当てたブリッジを設ける手法がある。
しかしながら、かかるブリッジを有している場合においても、内圧発生時に上面でブリッジから離れたところの一般部の面変形が生じ、つまり副気室SCの容積が変化し、消音量が十分得られない場合がある。以下、ブリッジを設ける構成の課題と、それを解決した本実施形態の副気室部材20の作用効果について対比して説明する。
図7は、比較例の副気室部材120の全体斜視図である。図8は、図7のA-A線で切り欠いた副気室部材120を示す断面図である。
図7および図8に示すように、比較例の副気室部材120(ヘルムホルツレゾネータ)は、本体部120aが、上面部材121と、この上面部材121との間に副気室SCを形成する下面部材122と、上面部材21と下面部材22とを突き合わせ結合させる複数のブリッジ部123と、を備えている。
図8に示すように、ブリッジ部123は、上面部材121が下面部材122に側に向かって窪むとともに、下面部材122が上面部材121側に向かって窪むように形成されている。すなわち、比較例の副気室部材120は、部材121と面部材122とが双方向から窪んで近付き、その先端部同士が結合してブリッジ部123を構成する。ブリッジ部123は、上面部材121の上面121aに形成された開口部123aと、下面部材122の下面122aに形成された開口部123bとが平面視で略円形を呈している。上記ブリッジ部123を設けることで、本実施形態と同様に、面変形を減少させて剛性確保を図ることができる。
本実施形態の副気室部材20が、上記構成を採ることができる理由および副気室部材20の作用効果について説明する。作用効果は、構成要素に対応して作用効果I~IIIに分けて考えることができる。
図4Aの符号A-Eに示すように、本実施形態の副気室部材20は、上面部材21の上面21aにおけるブリッジ部23の開口部23aの端部間距離(開口部23aの幅の指渡し距離)(図4の符号A,B)は、隣り合うブリッジ部23の開口部23aの端部間同士の距離(開口部23aと隣の開口部23a間の一般部の距離)(図4Aの符号C,D,E)よりも長く設定されている。すなわち、本実施形態の副気室部材20は、
A>C,D,E
B>C,D,E
であるように構成される。
A>C
B>E
このように構成することで、本実施形態の副気室部材20は、内圧が作用した時の面変形量を抑えることができ、消音量を向上させることができる。
本実施形態の副気室部材20は、図4Aの符号A-Eに示すブリッジ部23の開口部23aの寸法で構成されることにより、図3に示したように、ブリッジ部23の開口部23aの面積が上面部材21の上面21aの一般部の面積より大きい構成を採る。上述したように、副気室部材20の上面部材21の上面21aの面積に占める開口部23aの面積の割合は、20~80%(より好ましくは50~80%)である。
図2に示す副気室部材20の上面部材21の上面21aと、図7に示す比較例の副気室部材120の上面部材121の上面121aとを比較して分かるように、本実施形態では、ブリッジ部23の開口部23aの面積が上面部材21の上面21aの一般部の面積よりかなり大きく、副気室部材20の上面部材21の上面21aの面積に占める開口部23aの面積の割合は、約70%程度である。
本実施形態では、上面部材21の上面21aのブリッジ部23の開口部23aの面積をその他の上面部材21の上面21aの一般部の面積より大きくすることで、さらに上面21aの剛性を向上させることが可能になる。
図8の矢印a,bに示すように、比較例の副気室部材120は、ブリッジ部123がブリッジ最少抜き勾配(ブリッジの断面形状の成形型からの抜き勾配)断面を有する。
これに対して、本実施形態の副気室部材20は、図4の符号α,βに示すように、ブリッジ部23の側面部23bは上面部材21の上面21aに近づく程、両側面部23b間の距離が長くなるよう扇形状に構成される。すなわち、本実施形態の副気室部材20は、ブリッジ部23の断面形状の成形型からの抜き勾配が、比較例の抜き勾配よりも明らかに角度をもった扇形のブリッジ形状(抜き勾配5~45deg)を有する。
この構成により、上面部材21の上面21aのブリッジ部23の開口部23aの面積を大きく取ることができる。
図9は、比較例の副気室部材120の断面図である。図10は、図9の凹側から見た副気室部材120の下面の要部斜視図である。
図9および図10に示すように、比較例の副気室部材120は、部材121と面部材122とが双方向から窪んで近付き、その先端部同士が結合してブリッジ部123を構成する。ブリッジ部123は、上面部材121の上面121aに形成された開口部123aと、下面部材122の下面122aに形成された開口部123bとを有する。
本実施形態のブリッジ部23の構成と比較例のブリッジ部123の構成とを比較する。
比較例のブリッジ部123の構成では、図9の符号D11,D12に示すように、ブリッジ部123が上下面の中間に位置しているので、ブリッジ部123の(連結部)底部から上面部材121の上面121aまでの距離は小さい(深さが浅い)。
D1>D11
D2>D12
これにより、ブリッジ部23の扇形の面積を増やすことができ、面剛性を向上させることができる。
なお、図9と図4とを比較して分かるように、この比較例では、上面部材121と下面部材122との間に形成された副気室SCのうち、図9右側の副気室SC1のレゾネータ容量が小さくなっている。
図11に示すように、本実施形態のブリッジ部23構成を採ると比較例のブリッジ部123構成と比較して、図11の網掛け部分面積分、容量を多くすることが可能となる。
11c ウェル部
12 ディスク
14a,14b 縁部(嵌込部)
18 管体
19 連通孔
20 副気室部材(ヘルムホルツレゾネータ)
20a 本体部
21 上面部材
21a 上面
22 下面部材
23 ブリッジ部
23a 開口部(窓部)
23b 側面部
30 タイヤ
100 車両用ホイール
MC タイヤ空気室
SC 副気室
X ホイール周方向
Y ホイール幅方向
W 仕切り壁
Z ホイール径方向
P 距離の起点
Claims (5)
- タイヤ空気室内でヘルムホルツレゾネータとしての副気室部材をウェル部の外周面に有する車両用ホイールであって、
前記副気室部材は、
前記タイヤ空気室内側に配置される上面部材と、
前記ウェル部の外周面側に配置される下面部材と、
前記上面部材と前記下面部材とを付き合わせて結合させる複数のブリッジ部と、を備え、
前記上面部材の面上に開口した前記ブリッジ部の開口部の端部間距離は、隣接する前記ブリッジ部の開口部の端部までの距離よりも長く設定されていることを特徴とする車両用ホイール。 - 前記上面部材の上面に開口した前記ブリッジ部の開口部の面積が、その他の一般部の面積より大きい
ことを特徴とする請求の範囲第1項に記載の車両用ホイール。 - 前記ブリッジ部は、側面が前記上面部材の上面に近づく程、対向する側面間の距離が長くなるような扇型形状に構成される
ことを特徴とする請求の範囲第1項又は請求の範囲第2項に記載の車両用ホイール。 - 前記ブリッジ部は、前記上面部材のみが前記下面部材側に向かって窪んで前記下面部材に突き当たる
ことを特徴とする請求の範囲第1項乃至請求の範囲第3項のいずれか一項に記載の車両用ホイール。 - 前記副気室部材は、
前記ウェル部にはめ込む嵌込部を端部に有し、
前記上面部材の面上に開口した前記ブリッジ部の開口部の端部間距離は、前記ブリッジ部の開口部の端部と前記嵌込部までの距離よりも長く設定されている
ことを特徴とする請求の範囲第1項に記載の車両用ホイール。
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JPWO2017159830A1 (ja) * | 2016-03-16 | 2018-10-04 | 本田技研工業株式会社 | 車両用ホイール |
US10953689B2 (en) | 2016-03-16 | 2021-03-23 | Honda Motor Co., Ltd. | Vehicle wheel |
US11046111B2 (en) | 2016-03-16 | 2021-06-29 | Honda Motor Co., Ltd. | Vehicle wheel |
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US20180022151A1 (en) | 2018-01-25 |
DE112016001115T5 (de) | 2017-12-14 |
CN107428198B (zh) | 2020-09-22 |
US10479137B2 (en) | 2019-11-19 |
CN107428198A (zh) | 2017-12-01 |
JPWO2016143533A1 (ja) | 2017-10-19 |
JP6541769B2 (ja) | 2019-07-10 |
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