WO2015137370A1 - 車両用ホイール - Google Patents
車両用ホイール Download PDFInfo
- Publication number
- WO2015137370A1 WO2015137370A1 PCT/JP2015/057083 JP2015057083W WO2015137370A1 WO 2015137370 A1 WO2015137370 A1 WO 2015137370A1 JP 2015057083 W JP2015057083 W JP 2015057083W WO 2015137370 A1 WO2015137370 A1 WO 2015137370A1
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- WO
- WIPO (PCT)
- Prior art keywords
- air chamber
- helmholtz resonator
- resonance frequency
- communication hole
- auxiliary air
- Prior art date
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- 238000004891 communication Methods 0.000 claims abstract description 52
- 230000030279 gene silencing Effects 0.000 claims description 17
- 230000000052 comparative effect Effects 0.000 description 13
- 230000002093 peripheral effect Effects 0.000 description 12
- 230000008878 coupling Effects 0.000 description 10
- 238000010168 coupling process Methods 0.000 description 10
- 238000005859 coupling reaction Methods 0.000 description 10
- 230000001133 acceleration Effects 0.000 description 6
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000011324 bead Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Images
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
- B60B21/02—Rims characterised by transverse section
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C19/00—Tyre parts or constructions not otherwise provided for
- B60C19/002—Noise damping elements provided in the tyre structure or attached thereto, e.g. in the tyre interior
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B21/00—Rims
- B60B21/10—Rims characterised by the form of tyre-seat or flange, e.g. corrugated
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B21/00—Rims
- B60B21/10—Rims characterised by the form of tyre-seat or flange, e.g. corrugated
- B60B21/108—Rims characterised by the form of tyre-seat or flange, e.g. corrugated the surface of bead seats
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B25/00—Rims built-up of several main parts ; Locking means for the rim parts
- B60B25/22—Other apurtenances, e.g. for sealing the component parts enabling the use of tubeless tyres
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N1/00—Silencing apparatus characterised by method of silencing
- F01N1/02—Silencing apparatus characterised by method of silencing by using resonance
- F01N1/023—Helmholtz resonators
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B21/00—Rims
- B60B21/10—Rims characterised by the form of tyre-seat or flange, e.g. corrugated
- B60B21/102—Rims characterised by the form of tyre-seat or flange, e.g. corrugated the shape of bead seats
-
- 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
Definitions
- the present invention relates to a vehicle wheel.
- a wheel in which a Helmholtz resonator (sub-air chamber member) that silences air column resonance in a tire air chamber is attached to the outer peripheral surface of a well portion is known (see, for example, Patent Document 1).
- the Helmholtz resonator of this wheel has a sub air chamber inside, and four are arranged at equal intervals along the circumferential direction of the wheel.
- the resonance frequency of each Helmholtz resonator is matched to the resonance frequency of the tire air chamber.
- an object of the present invention is to provide a vehicle wheel that exhibits excellent silencing performance even when applied to a tire having a wide frequency band of air column resonance in the tire air chamber.
- the present invention that has solved the above problems is a vehicle wheel including a Helmholtz resonator having a sub air chamber that communicates with a tire air chamber via a communication hole, and is lower than a resonance frequency of air column resonance sound in the tire air chamber.
- Two sets of resonators, the communication hole of the first Helmholtz resonator and the communication hole of the second Helmholtz resonator are arranged at positions facing each other across the wheel rotation center, A line connecting the communication hole of the first Helmholtz resonator and the communication hole of the second Helmholtz resonator; Characterized in that said communication hole of said other set first Helmholtz resonator, a line connecting said communication hole of said second Helmholtz resonator are orthogonal to each other.
- the present invention it is possible to provide a vehicle wheel that exhibits excellent silencing performance even when applied to a tire having a wide frequency band of air column resonance sound in the tire air chamber.
- FIG. 1 is a perspective view of a vehicle wheel according to an embodiment of the present invention.
- FIG. 2 is a cross-sectional view taken along the line II-II in FIG. It is a whole perspective view of a sub air chamber member. It is a sectional side view which shows typically the arrangement position of the 1st Helmholtz resonator and the 2nd Helmholtz resonator.
- A) is side sectional drawing which shows typically the arrangement position of the 1st Helmholtz resonator in the vehicle wheel of the Example of this invention, and the 2nd Helmholtz resonator,
- (b) is the vehicle wheel of (a). It is a graph which shows the silencing performance in.
- (A) is a sectional side view schematically showing the arrangement position of the Helmholtz resonator in the vehicle wheel of Comparative Example 1 of the present invention, and (b) is a graph showing the silencing performance in the vehicle wheel of (a).
- (A) is a sectional side view schematically showing the arrangement position of the Helmholtz resonator in the vehicle wheel of Comparative Example 2 of the present invention, and (b) is a graph showing the silencing performance in the vehicle wheel of (a).
- It is the graph which put together and represented the diagram of the graph of FIG.5 (b), FIG.6 (b), and FIG.7 (b) into one.
- the vehicle wheel 1 of the present embodiment includes a plurality of auxiliary air chamber members 10 as Helmholtz resonators in the wheel circumferential direction X.
- auxiliary air chamber members 10a, 10b, 10c and 10d are provided.
- auxiliary air chamber member 10a and the auxiliary air chamber member 10d in the present embodiment correspond to the “first Helmholtz resonator” in the claims
- auxiliary air chamber member 10b and the auxiliary air chamber member 10c are: This corresponds to the “second Helmholtz resonator” in the claims.
- the vehicle wheel 1 includes a communication hole 18a of the first Helmholtz resonator having a resonance frequency lower than the resonance frequency of the air column resonance sound of the tire, and a resonance frequency higher than the resonance frequency of the air column resonance sound of the tire.
- Two communication holes 18a of the second Helmholtz resonator are provided.
- the vehicle wheel 1 according to the present embodiment includes a line connecting the communication hole of one set of the first Helmholtz resonator and the communication hole of the second Helmholtz resonator, and the other set of the first Helmholtz resonator.
- the main feature is that a line connecting the communication hole and the communication hole of the second Helmholtz resonator is orthogonal to each other.
- sub air chamber members 10a, 10b, 10c, and 10d are simply referred to as “sub air chamber members 10”.
- the vehicle wheel 1 includes a rim 11 and a disk 12 for connecting the rim 11 to a hub (not shown).
- reference numeral 11d denotes an outer peripheral surface of the well portion 11c
- the auxiliary air chamber member 10 is fitted into the well portion 11c as will be described in detail later.
- Reference numeral 18 denotes a tubular body in which the communication hole 18 a is formed
- reference numeral 15 denotes an annular vertical wall that is erected 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 10 is locked to the vertical wall 15 as described later.
- Reference numeral 15 a denotes a notch portion of the vertical wall 15 into which the tubular body 18 is fitted when the auxiliary air chamber member 10 is locked to the vertical wall 15.
- Reference symbol Y is an arrow indicating the wheel width direction.
- the rim 11 is recessed toward the inner side (rotation center side) in the wheel radial direction between the bead seat portions (not shown) of the tire formed at both ends in the wheel width direction Y. It has a well portion 11c.
- the well portion 11c is provided to drop a bead portion (not shown) of the tire when assembling a tire (not shown) to the rim 11.
- 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.
- An annular vertical wall 15 is erected 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 vertical wall 15 is erected on the outer peripheral surface 11d so as to form a first vertical wall surface 16a that rises outward from the outer peripheral surface 11d of the well portion 11c in the wheel radial direction (upper side of the drawing in FIG. 2, the same applies hereinafter). . Further, a second vertical wall surface 16b is provided on the side surface portion 11e formed inside the wheel width direction Y of the well portion 11c (on the left side in FIG. 2) so as to face the first vertical wall surface 16a. Yes.
- the vertical wall 15 in this embodiment is formed integrally with the well portion 11c when the rim 11 is cast.
- groove part 17a and the groove part 17b are formed in these 1st vertical wall surfaces 16a and 2nd vertical wall surfaces 16b, respectively. These groove portions 17a and 17b are formed along the circumferential direction of the outer peripheral surface 11d of the well portion 11c to form an annular peripheral groove. The edge portions 14a and the edge portions 14b of the auxiliary air chamber member 10 are fitted into the groove portions 17a and 17b.
- the groove parts 17a and 17b in this embodiment are formed by machining each of the vertical wall 15 and the side part 11e.
- FIG. 3 is an overall perspective view of the auxiliary air chamber member 10.
- the symbol X is an arrow indicating the wheel circumferential direction when the auxiliary air chamber member 10 is attached to the well portion 11c (see FIG. 1).
- Reference symbol Y is an arrow indicating the wheel width direction.
- the vehicle wheel 1 in the present embodiment includes the four auxiliary air chamber members 10a, 10b, 10c, and 10d (see FIG. 4), but the auxiliary air chamber members 10a and 10d (first The sub-air chamber members 10b and 10c (second Helmholtz resonator) have the same structure except that their resonance frequencies are set to be different. Therefore, the structure of the sub air chamber members 10a, 10b, 10c, and 10d will be described below as the sub air chamber member 10.
- the auxiliary air chamber member 10 is a member that is long in the wheel circumferential direction X, and includes a main body portion 13, a tubular body 18 in which a communication hole 18 a is formed, and an edge portion 14. .
- the longitudinal direction (wheel circumferential direction X) of the sub air chamber member 10 is curving so that the outer peripheral surface 11d (refer FIG. 1) of the well part 11c (refer FIG. 1) may be followed.
- the main body 13 of the sub air chamber member 10 includes a bottom plate 25b and an upper plate 25a that forms a sub air chamber SC between the bottom plate 25b.
- each of the upper board 25a and the bottom board 25b in this embodiment is the same thickness, these thicknesses may mutually differ.
- the upper plate 25a is curved so as to bulge above the bottom plate 25b arranged along the outer peripheral surface 11d side of the well portion 11c, thereby forming a sub air chamber SC.
- an upper coupling portion 33a is formed at a portion constituting the main body portion 13.
- the upper coupling portion 33a is formed so that the upper plate 25a is recessed toward the auxiliary air chamber SC, and has a circular shape in plan view.
- ten upper coupling portions 33a are formed so as to be aligned in a line on the center line of the main body portion 13 along the longitudinal direction (wheel circumferential direction X) of the auxiliary air chamber member 10.
- Two tubes are formed so as to be aligned in the short direction (wheel width direction Y) of the auxiliary air chamber member 10 at the position of the tubular body 18.
- the bottom plate 25b is formed with a bottom coupling portion 33b at a position corresponding to the upper coupling portion 33a.
- These bottom side coupling portions 33b are formed such that the bottom plate 25b is recessed toward the sub air chamber SC, and have a circular shape in plan view.
- These bottom-side coupling portions 33b have their distal ends integrated with the distal ends of the upper coupling portions 33a of the upper plate 25a to couple the upper plate 25a and the bottom plate 25b. In the present invention, such a structure that does not include the upper coupling portion 33a and the bottom coupling portion 33b can be employed.
- the tube body 18 has a communication hole 18 a inside thereof.
- the tubular body 18 is formed in the center of the auxiliary air chamber member 10 in the longitudinal direction (wheel circumferential direction X). Such a tubular body 18 protrudes from the main body 13 in the wheel width direction Y.
- the communication hole 18a is formed between the tire air chamber MC (see FIG. 2) and the auxiliary air chamber SC (see FIG. 2) which are to be formed between the tire 11 (not shown) on the well portion 11c (see FIG. 2).
- the Helmholtz resonator together with the auxiliary air chamber SC of the auxiliary air chamber member 10.
- the cross-sectional shape of the communication hole 18a is not particularly limited and is elliptical (see FIG. 3) in the present embodiment, but may be any shape such as a circle or a polygon.
- interval of the communicating holes 18a demonstrated in detail later is prescribed
- the tubular body 18 in the present embodiment having such a communication hole 18a is fitted into the cutout portion 15a (see FIG. 1) of the vertical wall 15, so that the wheel circumferential direction X (FIG. 1) of the auxiliary air chamber member 10 is obtained. It also has a function as an anti-rotation to the reference).
- the edge portion 14 couples the bottom plate 25b and the top plate 25a. Further, as shown in FIG. 3, the edge 14c and edge 14d extending from the main body 13 in the wheel circumferential direction X and the main body 13 extending in the direction orthogonal to the wheel circumferential direction X (wheel width direction Y).
- the edge 14 is constituted by the protruding edge 14a and edge 14b. That is, the edge portion 14 (14a, 14b, 14c, 14d) is formed of a plate-like body extending from the main body portion 13 so as to surround the main body portion 13.
- tip part of the edge part 14b fit into the groove part 17a of the 1st vertical wall surface 16a, and the groove part 17b of the 2nd vertical wall surface 16b. It is crowded.
- the edge portion 14a and the edge portion 14b extending toward the first vertical wall surface 16a and the second vertical wall surface 16b are integrated with the curved bottom plate 25b, as described above, and the outer peripheral surface of the well portion 11c. A curved surface that is convex toward the 11d side is formed.
- the thickness of the edge 14 is set to be substantially the same as the thickness of the bottom plate 25b and the top plate 25a.
- the edge part 14 has spring elasticity by selecting the thickness and material suitably.
- the auxiliary air chamber member 10 according to the present embodiment as described above is assumed to be a resin molded product, but is not limited to this, and can be formed of other materials such as metal.
- 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.
- FIG. 4 is a side sectional view schematically showing the arrangement positions of the auxiliary air chamber members 10a and 10d as the first Helmholtz resonator and the auxiliary air chamber members 10b and 10c as the second Helmholtz resonator.
- FIG. 4 schematically shows a cross section of the auxiliary air chamber members 10a, 10b, 10c, and 10d cut along a curved surface along the longitudinal curvature, and also schematically shows the formation position of the communication hole 18a.
- Vehicle wheel 1 of the present embodiment the sub air chamber member 10a, the resonant frequency f 0 of 10d (first Helmholtz resonator), the additional air chamber member 10b, the resonance frequency f 0 of 10c (second Helmholtz resonator) And a predetermined width difference.
- the resonance frequency f 0 of the auxiliary air chamber members 10a and 10d (first Helmholtz resonator) is f MC ⁇ [with respect to the resonance frequency f MC of the air column resonance sound in the tire air chamber MC.
- ⁇ is a positive number from 1 to 10
- the resonance frequency f 0 of the auxiliary air chamber members 10b and 10c is f MC + ⁇ [Hz] (where ⁇ is The same as above).
- the additional air chamber member 10a, the resonance frequency f 0 of 10d (first Helmholtz resonator) is set lower than the resonance frequency f MC of columnar resonance in the tire air chamber MC.
- the resonance frequency f 0 of the auxiliary air chamber members 10b and 10c (second Helmholtz resonator) is set higher than the resonance frequency f MC of the air column resonance sound in the tire air chamber MC.
- the setting of the resonance frequency f 0 of the sub air chamber member 10 according to the resonance frequency f MC of the air column resonance sound of the tire is the following (Formula 1) volume (V) of the sub air chamber SC, communication hole 18a.
- the length (L) and the opening cross-sectional area (S) of the communication hole 18a can be adjusted by appropriately adjusting several elements.
- f 0 C / 2 ⁇ ⁇ ⁇ (S / V (L + ⁇ ⁇ ⁇ S)) (Expression 1)
- C (m / s): sound velocity inside the sub-air chamber SC ( sound velocity inside the tire air chamber MC)
- S (m 2 ) sectional area of the opening of the communication hole 18a ⁇ : correction coefficient
- the vehicle wheel 1 has a sub air chamber member 10 a (first Helmholtz resonator) and a sub air chamber member 10 b (second Helmholtz resonator) in the wheel circumferential direction X.
- the auxiliary air chamber member 10c (second Helmholtz resonator) and the auxiliary air chamber member 10d (first Helmholtz resonator) are arranged in this order.
- the communication holes 18a of the auxiliary air chamber member 10a and the auxiliary air chamber member 10c constituting one set of the first Helmholtz resonator and the auxiliary air chamber member 10c are opposed to each other across the wheel rotation center Ax.
- the communication holes 18a of the auxiliary air chamber member 10d and the auxiliary air chamber member 10b constituting the other set of the first Helmholtz resonator and the auxiliary air chamber member 10b are opposed to each other across the wheel rotation center Ax. Has been placed.
- a line L2 connecting L1 and the communication hole 18a of the auxiliary air chamber member 10d (first Helmholtz resonator) and the communication hole 18a of the auxiliary air chamber member 10b (second Helmholtz resonator) is orthogonal to each other.
- “orthogonal” in the present embodiment means that the line L1 and the line L2 intersect at an angle of 90 degrees within a range including an error (deviation angle). This error (shift angle) is preferably within ⁇ 10 degrees.
- the frequency band for silencing is further expanded as compared with a conventional vehicle wheel (see, for example, Patent Document 1), as shown in Examples described later. Therefore, according to the vehicle wheel 1, excellent silencing performance can be exhibited even when applied to a tire having a wide frequency band of air column resonance in the tire air chamber MC.
- auxiliary air chamber members 10a, 10b, 10c, and 10d are used separately, but the present invention is based on the auxiliary air chamber members 10a, 10b, 10c, and 10d. A combination of several selected sub air chamber members 10 may be employed.
- the Helmholtz resonator is configured by the auxiliary air chamber member 10 that can be attached to the well portion 11c.
- the auxiliary air chamber SC and the communication hole 18a are provided with a cavity or the like in the rim 11. 11 can be directly built.
- the communication hole 18a of the sub air chamber member 10 is provided in the central portion in the longitudinal direction of the sub air chamber member 10, but the present invention is not limited to this. Therefore, the communication hole 18a may be configured to be formed at the end portion in the longitudinal direction of the auxiliary air chamber member 10 on the assumption that the line L1 and the line L2 are orthogonal to each other.
- the communication holes 18a of the auxiliary air chamber members 10a, 10b, 10c, and 10d have been described as being biased toward the disk 12 in the wheel width direction Y.
- the position is not limited to this. Accordingly, the communication holes 18a of the auxiliary air chamber members 10a, 10b, 10c, and 10d can be arranged at any position in the wheel width direction Y.
- the said line L1 and line L2 should just be orthogonally seen seeing from the direction in alignment with a wheel rotating shaft.
- FIG. 5A schematically shows the arrangement positions of the auxiliary air chamber members 10a and 10d (first Helmholtz resonator) and the auxiliary air chamber members 10b and 10c (second Helmholtz resonator) in the vehicle wheel 1 of the embodiment.
- FIG. 5 (b) is a graph which shows the muffling performance in the vehicle wheel 1 of Fig.5 (a). As shown in FIG.
- the sub air chamber member 10a of the present embodiment, 10d resonance frequency f 0 of the (first Helmholtz resonator) is the resonant frequency f MC of columnar resonance in the tire air chamber MC It is set to be lower by 5 [Hz].
- f 0 -f MC ⁇ 5 [Hz].
- the resonance frequency f 0 of the auxiliary air chamber members 10b, 10c (second Helmholtz resonator) of this embodiment is 5 [Hz] higher than the resonance frequency f MC of the air column resonance sound in the tire air chamber MC.
- f 0 ⁇ f MC 5 [Hz].
- a line L1 connecting the communication hole 18a of the auxiliary air chamber member 10a (first Helmholtz resonator) and the communication hole 18a of the auxiliary air chamber member 10c (second Helmholtz resonator), and the auxiliary air chamber member 10d (first A line L2 connecting the communication hole 18a of the (Helmholtz resonator) and the communication hole 18a of the auxiliary air chamber member 10b (second Helmholtz resonator) is orthogonal.
- reference numeral 20 denotes a tire tread.
- FIG. 5 (b) represents the magnitude [(m / s 2 ) / N] of vibration acceleration per vibration input 1N when the impact load is input converted into [dB] units. Is.
- the horizontal axis of FIG.5 (b) is resonance frequency [Hz]. Note that Rf on the horizontal axis is the median value (resonance frequency f MC ) of the resonance frequency of the air column resonance sound of the tire. As shown in FIG.
- the threshold value of vibration acceleration is set to a value (for example, 18 dB this time) that is smaller than the peak value of vibration acceleration in the vehicle wheel that does not have the auxiliary air chamber member 10 shown in the reference example.
- the frequency band of muffing centered on the median value Rf of the resonance frequency of the tire was 17 Hz.
- FIG. 6A is a side cross-sectional view schematically showing the arrangement positions of the four auxiliary air chamber members 10 in the vehicle wheel 100A of the first comparative example.
- FIG.6 (b) is a graph which shows the muffling performance in the vehicle wheel 1 of Fig.6 (a).
- the four auxiliary air chamber members 10 of the first comparative example have the resonance frequency f 0 equal to the resonance frequency f MC of the air column resonance sound in the tire air chamber MC.
- Is set to The line L1 and the line L2 that connect the communication holes 18a of the corresponding auxiliary air chamber members 10 across the wheel rotation center Ax are orthogonal to each other.
- reference numeral 20 denotes a tire tread.
- the silencing characteristics of the vehicle wheel 1 were evaluated in the same manner as in the example. As shown in FIG. 6B, the result is set to a value (for example, 18 dB this time) that is smaller than the peak value of vibration acceleration in the vehicle wheel that does not have the auxiliary air chamber member 10 shown in the reference example. In this case, the frequency band of the sound silencing centered on the median value Rf of the resonance frequency of the tire was 13 Hz.
- FIG. 7A shows the arrangement positions of the auxiliary air chamber members 10a and 10d (first Helmholtz resonator) and the auxiliary air chamber members 10b and 10c (second Helmholtz resonator) in the vehicle wheel 100B of Comparative Example 2.
- FIG. It is a side sectional view showing typically.
- FIG.7 (b) is a graph which shows the muffling performance in the vehicle wheel 1 of Fig.7 (a).
- the auxiliary air chamber members 10a and 10d face each other across the wheel rotation center Ax, and the auxiliary air chamber members 10b and 10c.
- the two (second Helmholtz resonators) face each other across the wheel rotation center Ax.
- the line L1 connecting the communication holes 18a of the opposing auxiliary air chamber members 10a and 10d and the line L2 connecting the communication holes 18a of the opposing auxiliary air chamber members 10b and 10c are orthogonal to each other.
- the resonance frequency f 0 of the auxiliary air chamber members 10a and 10d (first Helmholtz resonator) and the resonance frequency f 0 of the auxiliary air chamber members 10b and 10c (second Helmholtz resonator) are the auxiliary air chambers of the example. It is set to be the same as the members 10a, 10b, 10c, and 10d.
- the silencing characteristics of the vehicle wheel 1 were evaluated in the same manner as in the example. As shown in FIG. 7B, the result is set to a value (for example, 18 dB this time) that is smaller than the peak value of vibration acceleration in the vehicle wheel that does not have the auxiliary air chamber member 10 shown in the reference example. In this case, the frequency band of noise reduction centered on the median value Rf of the tire resonance frequency was 9 Hz.
- FIG. 8 is a graph in which the line diagrams of the graphs of FIGS. 5B, 6B, and 7B are combined into one.
- the reference example shown with the thick broken line of FIG. 8 has shown the distribution of the resonance frequency of the tire in the vehicle wheel which does not have the sub air chamber member 10.
- the muffler frequency band in the vehicle wheel 1 of the example in which the first Helmholtz resonator and the second Helmholtz resonator are opposed to each other with the wheel rotation center Ax interposed therebetween is the widest 17 Hz. .
- the vehicle wheel 100B according to the second comparative example is provided with the first Helmholtz resonator and the second Helmholtz resonator, but the first Helmholtz resonator and the second Helmholtz resonator are not opposed to each other with the wheel rotation center Ax interposed therebetween. Then, the frequency band of noise reduction was the narrowest 9 Hz.
- the vehicle wheel 1 of the present embodiment has the widest frequency band for silencing, and a tire having a wider frequency band for air column resonance than the vehicle wheels 100A and B of Comparative Examples 1 and 2. Excellent noise reduction performance.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Tires In General (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
Description
そして、各ヘルムホルツレゾネータの共鳴周波数は、タイヤ空気室の共鳴周波数に合わせられる。
そのため、タイヤ空気室内での気柱共鳴音の周波数帯域が広いタイヤに従来のホイール(例えば、特許文献1参照)を適用すると、消音性能が不十分となるおそれがある。
図1に示すように、本実施形態の車両用ホイール1は、ヘルムホルツレゾネータとしての副気室部材10をホイール周方向Xに複数備えている。図1においては、作図の便宜上、副気室部材10a及び副気室部材10bの2つのみを記載しているが、後に詳しく説明するように、車両用ホイール1は、ホイール周方向Xに4つの副気室部材10a,10b,10c,10d(図4参照)を備えている。ちなみに、本実施形態での副気室部材10a及び副気室部材10dは、特許請求の範囲にいう「第1のヘルムホルツレゾネータ」に相当し、副気室部材10b及び副気室部材10cは、特許請求の範囲にいう「第2のヘルムホルツレゾネータ」に相当する。
なお、以下の説明において、前記の副気室部材10a,10b,10c,10dを互いに区別しない場合には、単に「副気室部材10」と称する。
リム11は、図2に示すように、ホイール幅方向Yの両端部に形成されるタイヤのビードシート部(図示省略)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。
ウェル部11cは、図示しないタイヤをリム11に組み付けるリム組み時に、タイヤのビード部(図示省略)を落とし込むために設けられている。ちなみに、本実施形態でのウェル部11cは、ホイール幅方向Yに亘って略同径となる円筒形状に形成されている。
このウェル部11cの外周面11dには、リム11の周方向に延びるように環状の縦壁15が立設されている。
また、ウェル部11cのホイール幅方向Yの内側(図2の紙面左側)に形成される側面部11eには、第1の縦壁面16aと対向するように第2の縦壁面16bが設けられている。なお、本実施形態での縦壁15は、リム11を鋳造する際にウェル部11cと一体に成形される。
上板25aには、本体部13を構成する部分に、上側結合部33aが形成されている。この上側結合部33aは、上板25aが副気室SC側に向かって窪むように形成されたものであり、平面視で円形を呈している。
これらの底側結合部33bは、底板25bが副気室SC側に向かって窪むように形成されたものであり、平面視で円形を呈している。これらの底側結合部33bは、その先端部が、上板25aの上側結合部33aの先端部と一体になって、上板25aと底板25bとを結合している。
なお、本発明においては、このような上側結合部33a及び底側結合部33bを有しない構造とすることもできる。
このような管体18は、ホイール幅方向Yに本体部13から突出している。
連通孔18aは、ウェル部11c(図2参照)上で、図示しないタイヤとの間に形成されることとなるタイヤ空気室MC(図2参照)と、副気室SC(図2参照)とを連通させており、副気室部材10の副気室SCと共にヘルムホルツレゾネータを構成している。
なお、後に詳しく説明する連通孔18a同士の間隔は、連通孔18aの開口部の中心同士で規定される。
また、図3に示すように、ホイール周方向Xに本体部13から延出する縁部14c及び縁部14dと、ホイール周方向Xと直交する方向(ホイール幅方向Y)に本体部13から延出する縁部14a及び縁部14bとによって縁部14は構成されている。つまり、縁部14(14a,14b,14c,14d)は、本体部13を囲むように本体部13から周囲に延出している板状体で形成されている。
第1の縦壁面16a及び第2の縦壁面16bのそれぞれに向かって延出する縁部14a及び縁部14bは、前記したように、湾曲する底板25bと一体になってウェル部11cの外周面11d側に凸となる湾曲面を形成している。
図4は、第1のヘルムホルツレゾネータとしての副気室部材10a,10dと、第2のヘルムホルツレゾネータとしての副気室部材10b,10cの配置位置を模式的に示す側断面図である。図4は、副気室部材10a,10b,10c,10dを長手方向の曲率に沿う曲面で切断した断面を模式的に示すとともに、連通孔18aの形成位置を模式的に示している。
具体的には、タイヤ空気室MC内の気柱共鳴音の共鳴周波数fMCに対して、副気室部材10a,10d(第1のヘルムホルツレゾネータ)の共鳴周波数f0は、fMC-α[Hz](但し、αは1から10の正数)に設定され、副気室部材10b,10c(第2のヘルムホルツレゾネータ)の共鳴周波数f0は、fMC+α[Hz](但し、αは前記と同義)に設定される。
ちなみに、タイヤの気柱共鳴音の共鳴周波数fMCに応じた副気室部材10の共鳴周波数f0の設定は、次の(式1)の副気室SCの容積(V)、連通孔18aの長さ(L)、及び連通孔18aの開口部断面積(S)から選択されるいくつかの要素を適宜に調節することにより行うことができる。
f0(Hz):共鳴周波数
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18aの長さ
S(m2):連通孔18aの開口部断面積
α:補正係数
また、第1のヘルムホルツレゾネータと第2のヘルムホルツレゾネータとの他方の組を構成する副気室部材10dと副気室部材10bのそれぞれ連通孔18a同士がホイール回転中心Axを挟んで対向する位置に配置されている。
したがって、この車両用ホイール1によれば、タイヤ空気室MC内での気柱共鳴音の周波数帯域が広いタイヤに適用しても優れた消音性能を発揮することができる。
前記実施形態では、副気室部材10a,10b,10c,10dは、4つ別体のものを使用することを想定しているが、本発明は副気室部材10a,10b,10c,10dから選択されるいくつかの副気室部材10を組み合わせて一体としたものを採用することもできる。
(実施例)
図5(a)は、実施例の車両用ホイール1における副気室部材10a,10d(第1のヘルムホルツレゾネータ)と、副気室部材10b,10c(第2のヘルムホルツレゾネータ)の配置位置を模式的に示す側断面図である。図5(b)は、図5(a)の車両用ホイール1における消音性能を示すグラフである。
図5(a)に示すように、本実施例の副気室部材10a,10d(第1のヘルムホルツレゾネータ)の共鳴周波数f0は、タイヤ空気室MC内の気柱共鳴音の共鳴周波数fMCよりも5[Hz]低くなるように設定されている。図5(a)中、f0-fMC=-5[Hz]と記す。
また、本実施例の副気室部材10b,10c(第2のヘルムホルツレゾネータ)の共鳴周波数f0は、タイヤ空気室MC内の気柱共鳴音の共鳴周波数fMCよりも5[Hz]高くなるように設定されている。図5(a)中、f0-fMC=5[Hz]と記す。
副気室部材10a(第1のヘルムホルツレゾネータ)の連通孔18aと、副気室部材10c(第2のヘルムホルツレゾネータ)の連通孔18aとを結ぶ線L1と、副気室部材10d(第1のヘルムホルツレゾネータ)の連通孔18aと、副気室部材10b(第2のヘルムホルツレゾネータ)の連通孔18aとを結ぶ線L2とは直交している。
図5(a)中、符号20は、タイヤトレッドである。
タイヤが装着された車両用ホイール1のタイヤトレッド20に、ハンマ殴打による打撃荷重が入力された。そして、ホイール回転中心Axの振動加速度の大きさが測定された。その結果を図5(b)に示す。
図5(b)の縦軸は、打撃荷重が入力された際の加振入力1N当りの振動加速度の大きさ[(m/s2)/N]を[dB]単位に換算して表したものである。図5(b)の横軸は、共鳴周波数[Hz]である。なお、横軸のRfは、タイヤの気柱共鳴音の共鳴周波数の中央値(共鳴周波数fMC)である。
図5(b)に示すように、振動加速度の閾値を参考例に示す副気室部材10を有しない車両用ホイールにおける振動加速度のピーク値から任意の分だけ小さい値(例えば今回は18dB)に設定した場合に、タイヤの共鳴周波数の中央値Rfを中心とした消音の周波数帯域は、17Hzであった。
図6(a)は、比較例1の車両用ホイール100Aにおける4つの副気室部材10の配置位置を模式的に示す側断面図である。図6(b)は、図6(a)の車両用ホイール1における消音性能を示すグラフである。
図6(a)に示すように、本比較例1の4つの副気室部材10は、その共鳴周波数f0が、タイヤ空気室MC内の気柱共鳴音の共鳴周波数fMCと等しくなるように設定されている。
ホイール回転中心Axを挟んで対応する副気室部材10の連通孔18aを結ぶ線L1と線L2とは直交している。
図6(a)中、符号20は、タイヤトレッドである。
その結果は、図6(b)に示すように、参考例に示す副気室部材10を有しない車両用ホイールにおける振動加速度のピーク値から任意の分だけ小さい値(例えば今回は18dB)に設定した場合に、タイヤの共鳴周波数の中央値Rfを中心とした消音の周波数帯域は、13Hzであった。
図7(a)は、比較例2の車両用ホイール100Bにおける副気室部材10a,10d(第1のヘルムホルツレゾネータ)と、副気室部材10b,10c(第2のヘルムホルツレゾネータ)の配置位置を模式的に示す側断面図である。図7(b)は、図7(a)の車両用ホイール1における消音性能を示すグラフである。
図7(a)に示すように、比較例2では、副気室部材10a,10d同士(第1のヘルムホルツレゾネータ同士)がホイール回転中心Axを挟んで対向するとともに、副気室部材10b,10c同士(第2のヘルムホルツレゾネータ同士)がホイール回転中心Axを挟んで対向している。そして、対向する副気室部材10a,10dの連通孔18aを結ぶ線L1と、対向する副気室部材10b,10cの連通孔18aを結ぶ線L2とは直交している。
なお、副気室部材10a,10d(第1のヘルムホルツレゾネータ)の共鳴周波数f0と、副気室部材10b,10c(第2のヘルムホルツレゾネータ)の共鳴周波数f0は、実施例の副気室部材10a,10b,10c,10dと同じに設定されている。
その結果は、図7(b)に示すように、参考例に示す副気室部材10を有しない車両用ホイールにおける振動加速度のピーク値から任意の分だけ小さい値(例えば今回は18dB)に設定した場合に、タイヤの共鳴周波数の中央値Rfを中心とした消音の周波数帯域は、9Hzであった。
図8は、図5(b)、図6(b)、及び図7(b)のグラフの線図を1つにまとめて表したグラフである。なお、図8中、の太い破線で示される参考例は、副気室部材10を有しない車両用ホイールにおけるタイヤの共鳴周波数の分布を示している。
10 副気室部材
10a 副気室部材(第1のヘルムホルツレゾネータ)
10b 副気室部材(第2のヘルムホルツレゾネータ)
10c 副気室部材(第2のヘルムホルツレゾネータ)
10d 副気室部材(第1のヘルムホルツレゾネータ)
11 リム
11c ウェル部
11d 外周面
13 本体部
14 縁部
14a 縁部
14b 縁部
14c 縁部
14d 縁部
15 縦壁
16a 第1の縦壁面
16b 第2の縦壁面
17a 溝部
17b 溝部
18a 連通孔
25a 上板
25b 底板
X ホイール周方向
Y ホイール幅方向
SC 副気室
MC タイヤ空気室
Ax ホイール回転中心
Claims (2)
- タイヤ空気室と連通孔を介して連通する副気室を有するヘルムホルツレゾネータを備える車両用ホイールであって、
タイヤ空気室内の気柱共鳴音の共鳴周波数よりも低い共鳴周波数の音に対する消音特性を有するように設定された第1のヘルムホルツレゾネータと、
前記気柱共鳴音の共鳴周波数よりも高い共鳴周波数の音に対する消音特性を有するように設定された第2のヘルムホルツレゾネータと、
の組を2組備え、
前記第1のヘルムホルツレゾネータの前記連通孔と、前記第2のヘルムホルツレゾネータの前記連通孔とが、ホイール回転中心を挟んで対向する位置に配置され、一方の組の前記第1のヘルムホルツレゾネータの前記連通孔と、前記第2のヘルムホルツレゾネータの前記連通孔とを結ぶ線と、他方の組の前記第1のヘルムホルツレゾネータの前記連通孔と、前記第2のヘルムホルツレゾネータの前記連通孔とを結ぶ線とが互いに直交していることを特徴とする車両用ホイール。 - 請求項1に記載の車両用ホイールにおいて、
タイヤ空気室内の気柱共鳴音の共鳴周波数fMCに対して、第1のヘルムホルツレゾネータの共鳴周波数f0は、fMC-α[Hz](但し、αは1から10の正数)に設定され、第2のヘルムホルツレゾネータの共鳴周波数f0は、fMC+α[Hz](但し、αは前記と同義)に設定されていることを特徴とする車両用ホイール。
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2015
- 2015-03-11 DE DE112015001213.3T patent/DE112015001213T5/de not_active Withdrawn
- 2015-03-11 WO PCT/JP2015/057083 patent/WO2015137370A1/ja active Application Filing
- 2015-03-11 CN CN201580013095.3A patent/CN106068189B/zh active Active
- 2015-03-11 JP JP2016507774A patent/JP6154064B2/ja active Active
- 2015-03-11 US US15/125,480 patent/US10011148B2/en active Active
Patent Citations (3)
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JP2010095104A (ja) * | 2008-10-15 | 2010-04-30 | Honda Motor Co Ltd | 車両用ホイール |
JP2010095147A (ja) * | 2008-10-16 | 2010-04-30 | Honda Motor Co Ltd | 車両用ホイール |
JP2012051397A (ja) * | 2010-08-31 | 2012-03-15 | Honda Motor Co Ltd | 副気室部材及びこれを備える車両用ホイール |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2016147878A1 (ja) * | 2015-03-19 | 2016-09-22 | 本田技研工業株式会社 | 車両用ホイール |
JPWO2016147878A1 (ja) * | 2015-03-19 | 2017-10-19 | 本田技研工業株式会社 | 車両用ホイール |
US10504500B2 (en) | 2015-03-19 | 2019-12-10 | Honda Motor Co., Ltd. | Vehicle wheel |
Also Published As
Publication number | Publication date |
---|---|
DE112015001213T5 (de) | 2017-01-12 |
JP6154064B2 (ja) | 2017-06-28 |
CN106068189A (zh) | 2016-11-02 |
JPWO2015137370A1 (ja) | 2017-04-06 |
US10011148B2 (en) | 2018-07-03 |
US20170120673A1 (en) | 2017-05-04 |
CN106068189B (zh) | 2018-04-06 |
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