JP2014226992A - Vehicle wheel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle wheel comprising an auxiliary air chamber member capable of appropriately securing the volume of an auxiliary air chamber even when a wheel diameter and a wheel width decrease.SOLUTION: In a vehicle wheel 100, on a cross section in a wheel width direction of a main body portion 13 of an auxiliary air chamber 10, a portion forming a principal portion of an auxiliary air chamber SC in a top plate 25a is formed, inside in a wheel radial direction Z of a line 11g connecting an apex portion of a longitudinal wall 15 to an apex portion near a longitudinal wall surface 16b of a hump portion 11f, along the line 11g.

Description

  The present invention relates to a vehicle wheel.

Conventionally, as a wheel for reducing road noise caused by air column resonance in the tire air chamber, the auxiliary air chamber member functioning as a Helmholtz resonator in the tire air chamber has been disclosed by the applicant of the present application. The one fixed to is known (for example, see Patent Document 1).
The wheel extends in the circumferential direction on a first vertical wall surface formed to extend in the circumferential direction of the outer circumferential surface on a vertical wall standing on the outer circumferential surface of the well portion, and on one rising portion of the well portion. A first vertical wall surface and a second vertical wall surface facing each other in the width direction of the outer peripheral surface. A groove extending in the circumferential direction is formed in each of the first vertical wall surface and the second vertical wall surface, and the auxiliary air chamber member is fitted between the first vertical wall surface and the second vertical wall surface. It is out.

  Further, the sub air chamber member includes a resin main body portion including a sub air chamber and a communication hole that communicates the sub air chamber with the tire air chamber. The auxiliary air chamber member extends from the main body portion toward the first vertical wall surface and is formed to extend in the circumferential direction, and is engaged with the groove portion of the first vertical wall surface. With an edge. The auxiliary air chamber member extends from the main body portion toward the second vertical wall surface and is formed to extend in the circumferential direction. The second air chamber member is locked to the groove portion of the second vertical wall surface. With an edge. Then, the auxiliary air chamber member locks the first edge portion with the groove portion of the first vertical wall surface, and locks the second edge portion with the groove portion of the second vertical wall surface. It is fixed to the outer peripheral surface of the part. Such a sub air chamber member is formed so that the cross section in the width direction is symmetrical.

JP 2012-51397 A (FIGS. 2, 3, 9, etc.)

By the way, the wheel diameter and the wheel width vary depending on the size and form of the vehicle. Therefore, assuming that a conventional wheel (see, for example, Patent Document 1) is attached to a vehicle having a small wheel diameter or wheel width, the volume of the auxiliary air chamber decreases as the wheel diameter or wheel width decreases.
However, if the volume of the auxiliary air chamber is reduced, the auxiliary air chamber member has a reduced silencing effect on the air column resonance sound of the tire air chamber and cannot sufficiently reduce road noise caused by the air column resonance sound of the tire air chamber. Cause problems.

  Then, the subject of this invention is providing the wheel for vehicles provided with the sub air chamber member which can fully ensure the volume of a sub air chamber, even when a wheel diameter and a wheel width reduce.

  The present invention that has solved the above problems 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, and is a vertical wall that is erected on the outer peripheral surface of the well portion A first vertical wall surface formed so as to extend in the circumferential direction of the outer peripheral surface, and a first vertical wall surface formed on one rising portion of the well portion so as to extend in the circumferential direction. A second vertical wall surface facing in the width direction, and the top of the vertical wall has a height from the outer peripheral surface lower than the top of the hump portion on the second vertical wall surface side, and the vertical wall and the A portion between the other rising portion of the well portion is used to drop the tire bead portion when the tire is assembled, and the auxiliary air chamber member is provided between the first vertical wall surface and the second vertical wall surface. And a sub air chamber is formed between the bottom plate on the outer peripheral surface side and the bottom plate. And a communication hole that communicates the auxiliary air chamber with the tire air chamber, and is formed at both ends in the width direction of the main body portion, and the main body portion is defined as a first vertical wall surface. Each of the second vertical wall surfaces, and in the cross-section in the width direction of the main body portion, a portion related to the formation of the main portion of the auxiliary air chamber in the upper plate is the vertical portion. It is characterized in that it is formed along the connecting line on the inner side in the wheel radial direction of the line connecting the top part of the wall and the top part of the hump part on the second vertical wall surface side.

According to such a vehicle wheel, the portion forming the main portion of the auxiliary air chamber in the upper plate of the auxiliary air chamber member connects the top of the vertical wall and the top of the hump portion on the second vertical wall surface side. Therefore, the portion forming the main portion is arranged inside the passing line of the tire bead when the tire is assembled. Moreover, since the part which forms the main part of a sub air chamber is arrange | positioned along the said line, it becomes possible to expand a sub air chamber to the outer side of a wheel radial direction to the maximum. Therefore, according to this vehicle wheel, the maximum auxiliary air chamber volume can be secured at a position where the tire bead is not interfered when the tire is assembled.
As a result, the vehicle wheel according to the present invention can secure the necessary volume of the auxiliary air chamber even when the wheel diameter or the wheel width is reduced, and the volume of the auxiliary air chamber is reduced. The noise reduction effect on the air column resonance sound of the tire is lowered, and the problem that road noise cannot be sufficiently reduced is solved.

  In this vehicle wheel, a pair of auxiliary air chamber members may be arranged so as to face each other across the wheel rotation center.

  According to such a vehicle wheel, since the wheel unbalance (static balance) generated by one of the pair of auxiliary air chamber members is canceled by the wheel unbalance (static balance) generated by the other, A counterweight for facing the air chamber member becomes unnecessary.

  ADVANTAGE OF THE INVENTION According to this invention, even when a wheel diameter and a wheel width reduce, a vehicle wheel provided with the sub air chamber member which can fully ensure the volume of a sub air chamber can be provided.

1 is a perspective view of a vehicle wheel according to an embodiment of the present invention. It is a whole perspective view of a sub air chamber member. (A) is a top view of the sub air chamber member seen from the convex side of FIG. 2, (b) is a bottom view of the sub air chamber member seen from the concave side of FIG. It is a perspective view which shows the sub air chamber member notched by the IV-IV line of FIG. It is VV sectional drawing of FIG. FIG. 4 is a cross-sectional view taken along the line VI-VI in FIG. 1 and includes a cross-sectional view taken along the line VI-VI of the auxiliary air chamber member in FIG. 3. It is a fragmentary sectional view of the vehicle wheel which concerns on this embodiment which shows the positional relationship with the sub air chamber member attached to the well part, the hump part, and the vertical wall. (A) is a partial expansion perspective view of the vicinity of the protrusion of the auxiliary air chamber member and the vicinity of the notch formed in the vertical wall of the well, and (b) shows the protrusion fitted into the notch. It is a partial expansion perspective view. (A) is a schematic diagram which shows a mode that the sub air chamber member is arrange | positioned on a well part in the vehicle wheel which concerns on embodiment of this invention, (b) is sub-vehicle in the vehicle wheel which concerns on other embodiment. It is a schematic diagram which shows a mode that the air chamber member is arrange | positioned on a well part. (A) And (b) is process explanatory drawing explaining the attachment method of the sub air chamber member with respect to the well part of a rim | limb.

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.
Below, after demonstrating the whole structure of the wheel for vehicles, a sub air chamber member is demonstrated in detail.

FIG. 1 is a perspective view of a vehicle wheel 100 according to an embodiment of the present invention.
As shown in FIG. 1, 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 is a well portion that is recessed toward the inner side in the wheel radial direction (rotation center side) between tire bead seat portions (not shown) formed at both ends in the wheel width direction Y shown in FIG. 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. Incidentally, 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.

  In FIG. 1, 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 20 (see FIG. 2) described later is formed, and reference numeral 15 denotes an annular vertical wall provided on the outer peripheral surface 11d of the well portion 11c so as to extend in the circumferential direction of the rim 11. It is. Incidentally, the auxiliary air chamber member 10 is locked to the vertical wall 15 as described later. Reference numeral 15 a denotes a cutout portion of the vertical wall 15 into which the protruding portion 26 of the auxiliary air chamber member 10 is fitted when the auxiliary air chamber member 10 is locked to the vertical wall 15. In FIG. 1, the symbol X is the wheel circumferential direction.

Next, the auxiliary air chamber member 10 will be described.
FIG. 2 is an overall perspective view of the auxiliary air chamber member 10.
As shown in FIG. 2, the auxiliary air chamber member 10 is a member that is long in one direction, and has a hollow main body portion 13 having an auxiliary air chamber SC (see FIG. 4) to be described later, and the main body portion 13. Edge portions 14a and 14b to be engaged with first and second vertical wall surfaces 16a and 16b (see FIG. 6) described later.
The edge portions 14a and 14b correspond to “locking portions” in the claims.

  The auxiliary air chamber member 10 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 13, and a communication hole 20 that communicates with the auxiliary air chamber SC (see FIG. 4) is formed inside thereof. Reference numeral 26 denotes a protrusion described later provided on the edge portion 14a, and reference numeral Y denotes a wheel width direction.

Next, FIG. 3A to be referred to is a top view of the auxiliary air chamber member 10 as viewed from the convex side of FIG. 2, and FIG. 3B is a lower surface of the auxiliary air chamber member 10 as viewed from the concave side of FIG. FIG.
As shown in FIG. 3A, the auxiliary air chamber member 10 has a long rectangular shape in plan view. The planar shape of the main body 13 is a substantially rectangular shape that is slightly smaller than the planar shape of the auxiliary air chamber member 10 when the formation region of the tubular body 18 (including the formation region of the coupling portion 35 described in detail later) is combined. Yes.
The main body portion 13 in which a sub air chamber SC (see FIG. 4) to be described later is formed, that is, the main body portion 13 excluding the tube 18 and the coupling portion 35 is viewed from above (plan view) shown in FIG. It has a substantially hat shape (substantially convex shape).

  And the main-body-part 13 part in which the sub air chamber SC (refer FIG. 4) is formed is comprised by the said substantially hat-shaped peak part and the substantially hat-shaped collar part. In other words, a full width portion 13a (corresponding to a mountain height portion) extending in the wheel circumferential direction X with the maximum width, and a bulge that is provided in parallel with the tubular body 18 in the wheel width direction Y and bulges from the full width portion 13a in the wheel circumferential direction X. The main part is composed of a protruding part 13b (corresponding to the collar part).

  As shown in FIG. 3A, on the upper surface side of the main body portion 13 (the convex side of the auxiliary air chamber member 10), the main body portion 13 is crossed in the width direction (wheel width direction Y) at the center in the longitudinal direction. A groove D1 extends in the groove. As will be described later, the groove D1 is formed by recessing the upper plate 25a (see FIG. 4) of the main body 13 toward the bottom plate 25b (see FIG. 4).

Moreover, as shown in FIG.3 (b), the main-body part 13 is made into the width direction (wheel width direction Y) in the center of the longitudinal direction in the lower surface side (concave side of the sub air chamber member 10) of the main-body part 13. As shown in FIG. A groove D2 extends so as to cross. As will be described later, the groove D2 is formed by recessing the bottom plate 25b (see FIG. 4) of the main body 13 toward the upper plate 25a (see FIG. 4).
Incidentally, the groove D1 and the groove D2 constitute a partition wall W (see FIG. 4) described later by partially connecting the upper plate 25a and the bottom plate 25b, and the partition wall W is a hollow of the main body 13. By dividing the portion into two, a pair of auxiliary air chambers SC (see FIG. 4) to be described later is formed in the main body portion 13.

As shown in FIG. 3A, each of the pair of tubular bodies 18 is at both ends in the longitudinal direction (wheel circumferential direction X) of the auxiliary air chamber member 10 and in the short direction of the auxiliary air chamber member 10 ( It is biased and arranged on one side edge in the wheel width direction Y). Specifically, the tubular body 18 in the present embodiment is disposed closer to one edge portion 14b side of the two edge portions 14a and 14b.
The tubular body 18 extends along the longitudinal direction of the auxiliary air chamber member 10 (the wheel circumferential direction X). And each of the communicating hole 20 (refer FIG.3 (b)) formed in a pair of pipe body 18 is connecting the pair of sub air chamber SC (refer FIG. 4) separately with the exterior. That is, the auxiliary air chamber member 10 has a structure in which two Helmholtz resonators 19a and 19b are integrally formed with the groove D1 and the groove D2 as a boundary.

Each of the edge portions 14 a and 14 b extends from the main body portion 13 toward the short direction (wheel width direction Y) of the auxiliary air chamber member 10. These edge portions 14a and 14b lock the auxiliary air chamber member 10 to the well portion 11c (see FIG. 1). The edges 14a and 14b will be described in detail later.
In FIG. 3A, reference numeral 26 denotes a protrusion which will be described in detail later. Reference numeral 33a denotes an upper coupling portion. In FIG. 3B, reference numeral 30 denotes a bead, and reference numeral 33b denotes a lower coupling portion. The upper coupling portion 33a, the bead 30, and the lower coupling portion 33b will be described with reference to FIGS.

FIG. 4 is a perspective view showing the auxiliary air chamber member 10 cut out along the line IV-IV in FIG. 3. 5 is a cross-sectional view taken along the line VV in FIG.
As shown in FIGS. 4 and 5, the main body 13 of the sub air chamber member 10 includes a bottom plate 25 b and an upper plate 25 a that forms a sub air chamber SC between the bottom plate 25 b. In addition, although each of the resin material which comprises 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.
Incidentally, the communication hole 20 of the tubular body 18 extending in the wheel circumferential direction X communicates with the auxiliary air chamber SC at one end side in the wheel circumferential direction X and opens to the outside at the other end side, as shown in FIG. ing.

  The volume of each auxiliary air chamber SC, SC is preferably about 50 to 250 cc. By setting the volume of the auxiliary air chamber SC within this range, each of the Helmholtz resonators 19a and 19b exhibits a silencing effect sufficiently, while suppressing an increase in its weight and reducing the weight of the vehicle wheel 100. Can be planned. Further, the length of the auxiliary air chamber member 10 in the wheel circumferential direction X (see FIG. 2) 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 20 allows the tire air chamber MC (see FIG. 6) to be formed between the tire 11 (see FIG. 1) and the tire (not shown) and the auxiliary air chamber SC on the well portion 11c (see FIG. 1). .
The cross-sectional shape of the communication hole 20 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 20 is desirably 5 mm or more when the cross section is circular. In addition, the communication hole 20 having a cross-sectional shape other than a circle preferably has a diameter of 5 mm or more when converted into a circle having the same cross-sectional area.

  The length of the communication hole 20 is set so as to satisfy the equation for obtaining the resonant vibration frequency of the Helmholtz resonator represented by the following (Equation 1).

f ₀ = C / 2π × √ (S / V (L + α × √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)
V (m ³ ): Volume of the auxiliary air chamber SC L (m): Length of the communication hole 20 S (m ² ): Cross-sectional area of the opening of the communication hole 20 α: Correction coefficient The resonance vibration frequency f ₀ is The resonance vibration frequency of the tire air chamber MC is adjusted.

  As shown in FIG. 4, the upper plate 25 a is formed with an upper coupling portion 33 a in a portion constituting the main body portion 13. The upper coupling portion 33a is formed such that the upper plate 25a is recessed toward the bottom plate 25b side, and has a circular shape in plan view. As shown in FIG. 2, the upper coupling portion 33 a is formed so as to be arranged in two rows in the width direction of the main body portion 13 along the longitudinal direction (wheel circumferential direction X) of the auxiliary air chamber member 10. Specifically, as shown in FIG. 3A, in the full width portion 13a, a total of 20 upper coupling portions 33a are formed in two rows, and in each of the bulging portions 13b, one each, a total of two upper portions A coupling portion 33a is formed.

As shown in FIG. 4, the bottom plate 25b is formed with a lower coupling portion 33b at a position corresponding to the upper coupling portion 33a.
These lower coupling portions 33b are formed such that the bottom plate 25b is recessed toward the upper plate 25a side, and have a circular shape in plan view. These lower coupling portions 33b have their distal ends integrated with the distal ends of the upper coupling portions 33a of the upper plate 25a to partially couple the upper plate 25a and the bottom plate 25b.
Incidentally, the upper coupling portion 33a and the lower coupling portion 33b coupled to each other in the auxiliary air chamber SC improve the mechanical strength of the auxiliary air chamber member 10 and suppress the fluctuation of the volume of the auxiliary air chamber SC. In this configuration, the mute function described later is more effectively exhibited.
In the present invention, such a structure that does not include the upper coupling portion 33a and the lower coupling portion 33b may be employed.

As shown in FIGS. 4 and 5, the sub air chamber member 10 has a hollow portion of the main body portion 13 divided into two sub air chambers SC by a partition wall W.
As described above, the auxiliary air chamber member 10 is configured such that the two Helmholtz resonators 19a and 19b are integrally formed with the partition wall W as a boundary.

Incidentally, as described above, the partition wall W is formed by joining the groove D1 formed on the upper plate 25a side and the groove D2 formed on the bottom plate 25b side. The partition wall W forms a pair of sub air chambers SC by dividing the hollow portion of the main body portion 13 into two.
The partition wall W only needs to partition the hollow portion of the main body 13 to form two auxiliary air chambers SC. For example, the upper and lower plates 25a and 25b are formed only by the groove D1 without forming the groove D2. It may be formed by bonding. The partition wall W may be formed by joining the upper plate 25a and the bottom plate 25b only by the groove D2 without forming the groove D1.

Next, the coupling portion 35 formed between the bulging portion 13b of the main body portion 13 and the tubular body 18 will be described.
As shown in FIGS. 4 and 5, the coupling portion 35 is formed by joining the bulging portion 13b and the tubular body 18 so that the upper plate 25a and the bottom plate 25b are partially integrated. It is.
Specifically, as shown in FIG. 5, the coupling portion 35 is formed by joining the upper plate 25 a and the bottom plate 25 b at the end portion in the wheel circumferential direction X of the full width portion 13 a of the main body portion 13. An end 35a is formed. Further, the coupling portion 35 is formed of a bent plate body that forms a bent portion that protrudes outward in the wheel radial direction Z while extending in the wheel circumferential direction X from the base end 35a. Incidentally, the base end 35a and the front end 35b of the coupling portion 35 in the present embodiment are formed at the same height as the bottom plate 25b (on the same curved surface in the wheel circumferential direction X).

  As shown in FIG. 5, the bead 30 (see FIG. 3B) has a bottom plate 25 b that is partially recessed toward the upper plate 25 a side. As shown in FIG. 3B, the bead 30 in the present embodiment extends in the width direction of the auxiliary air chamber member 10 (the wheel width direction Y) at the position where the lower coupling portion 33b is formed. That is, the bead 30 increases the surface rigidity of the bottom plate 25b (see FIG. 5) by joining to the lower coupling portion 33b.

Next, the attachment aspect of the sub air chamber member 10 with respect to the well part 11c (refer FIG. 1) is demonstrated. 6 is a cross-sectional view taken along the line VI-VI in FIG. 1 and includes a cross-sectional view taken along the line VI-VI of the auxiliary air chamber member 10 shown in FIG.
As shown in FIG. 6, the edge portion 14 a and the edge portion 14 b are formed so as to extend in the wheel width direction Y from the main body portion 13 formed by the upper plate 25 a and the bottom plate 25 b as described above. And the edge part 14a is extended toward the 1st vertical wall surface 16a from the main-body part 13, and the front-end | tip is fitted in the groove part 17a of the 1st vertical wall surface 16a. Moreover, the edge part 14b is extended toward the 2nd vertical wall surface 16b from the main-body part 13, and the front-end | tip is fitted in the groove part 17b of the 2nd vertical wall surface 16b.

  Incidentally, the 1st vertical wall surface 16a is prescribed | regulated by the side surface inside the wheel width direction Y of the vertical wall 15 (left side of the paper surface of FIG. 6). The second vertical wall surface 16b is defined by a side surface portion (rising portion) 11e of the well portion 11c facing the first vertical wall surface 16a. The 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 circumferential groove. In the present embodiment, the vertical wall 15 and the side surface portion 11e are formed integrally with the well portion 11c when the rim 11 (see FIG. 1) is cast, and the groove portions 17a and 17b are respectively formed on the vertical wall 15 and the side surface portion 11e. It is formed by machining.

  And in this embodiment, the length L2 of one edge part 14b is shorter than the length L1 of the other edge part 14a among the edge part 14a and the edge part 14b. Here, the length L1 of the edge portion 14a is equal to the distance from the outer end of the main body portion 13 on the first vertical wall surface 16a side to the bottom of the groove portion 17a. In this embodiment, the length L1 is the first distance from the outer end of the main body portion 13. It is equal to the distance to the vertical wall surface 16a. Further, the length L2 of the edge portion 14b is equal to the distance from the outer end of the main body portion 13 on the second vertical wall surface 16b side to the bottom of the groove portion 17b. It is equal to the distance to the vertical wall surface 16b.

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 and protrude toward the outer peripheral surface 11d side of the well portion 11c. A curved surface is formed. And these edge parts 14a and 14b have spring elasticity by selecting the thickness and material suitably.
In FIG. 6, symbol SC is a sub air chamber, and symbol MC is a tire air chamber formed between a tire (not shown) and the well portion 11c. Reference numeral 26 denotes a protrusion that is fitted into the notch 15 a of the vertical wall 15.

  Next, regarding the positional relationship between the auxiliary air chamber member 10, the hump portion 11f (see FIG. 7) described later, and the vertical wall 15 when the auxiliary air chamber member 10 is disposed on the well portion 11c. explain. FIG. 7 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 attached to the well portion, the hump portion, and the vertical wall.

  As shown in FIG. 7, the rim 11 is formed in an L shape from the bead seat portions 11 a and 11 a formed at both ends in the wheel width direction Y and from the bead seat portions 11 a and 11 a toward the outer side in the wheel radial direction Z. Rim flange portions 11b, 11b bent in the above-mentioned manner, and the well portion 11c recessed between the bead seat portions 11a, 11a in the wheel radial direction.

As described above, the well portion 11 c is provided to drop the bead portions 21 a and 20 a of the tire 21 when the tire 21 is assembled to the rim 11.
And the bead sheet | seat parts 11a and 11a have the hump parts 11f and 11f which swelled in the wheel radial direction outer side before the well part 11c sinks.
In FIG. 7, reference numeral MC denotes a tire air chamber.

  In the vehicle wheel 100 according to the present embodiment, 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.

  Further, in the cross section of the main body 13 in the wheel width direction Y, the “part relating to the formation of the main part of the sub air chamber SC” P in the upper plate 25a is the hump on the side of the top of the vertical wall 15 and the second vertical wall 16b. It is formed along the line 11g inside the wheel radial direction Z of the line 11g connecting the top of the part 11f.

Next, FIG. 8A to be referred to is a partially enlarged perspective view of the vicinity of the protruding portion 26 of the auxiliary air chamber member 10 and the vicinity of the notch 15a formed in the vertical wall 15 of the well portion 11c. ) Is a partially enlarged perspective view showing the protrusion 26 fitted in the notch 15a.
As shown in FIG. 8A, the protruding portion 26 is a section formed so as to protrude outward in the wheel radial direction Z (above the arrow Z) at the tip of the edge portion 14 a of the auxiliary air chamber member 10. A rectangular parallelepiped that is long in the wheel circumferential direction X). The width of the protrusion 26 in the circumferential direction X of the wheel is such that it can be accommodated in a notch 15 a formed in the vertical wall 15.

Further, as shown in FIG. 8B, the protruding height of the protruding portion 26 protrudes into the inner upper portion 15b of the notch portion 15a when the end of the edge portion 14a is fitted into the groove portion 17a of the vertical wall 15. The height is set such that the portion 26 can come into contact therewith.
Thereby, when the auxiliary air chamber member 10 is locked to the vertical wall 15 via the edge portion 14a, the protruding portion 26 is fitted into the cutout portion 15a of the vertical wall 15 so that the auxiliary air chamber member 10 is fitted. Functions as a detent in the wheel circumferential direction X.

  The sub air chamber member 10 according to the present embodiment as described above is assumed to be a resin molded product. In the case of 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. Among these, polypropylene that is resistant to repeated bending fatigue is particularly desirable.

Next, the position of the auxiliary air chamber member 10 in the vehicle wheel 100 of the present embodiment will be described.
FIG. 9A is a schematic view showing a state in which the auxiliary air chamber member 10 is disposed on the well portion 11c in the vehicle wheel 100 according to the embodiment of the present invention, and FIG. 9B is related to another embodiment. FIG. 6 is a schematic view showing a state in which the auxiliary air chamber member 10 is disposed on the well portion 11c in the vehicle wheel 100.

As shown in FIG. 9A, the vehicle wheel 100 according to the present embodiment has a configuration in which the two Helmholtz resonators 19a and 19b are integrally formed as described above, and the Helmholtz resonator 19a The communication hole 20a and the communication hole 20b of the Helmholtz resonator 19b are provided apart from each other in the circumferential direction at an angle of 90 ° around the wheel rotation center Ax.
Reference numeral B denotes a counterweight that cancels a wheel unbalance (static balance) caused by attaching the auxiliary air chamber member 10 to the well portion 11c.

  According to such a vehicle wheel 100, the communication holes 20a and 20b are provided apart from each other in the circumferential direction at an angle of 90 ° around the wheel rotation center Ax, thereby preventing the occurrence of so-called noise reduction unevenness. be able to.

  Further, as shown in FIG. 9B, in the vehicle wheel 100 according to another embodiment, the first sub air chamber member 10a and the second sub air chamber member 10b sandwich the wheel rotation center Ax. It is attached to the well part 11c so as to face each other. Incidentally, the first sub air chamber member 10 a and the second sub air chamber member 10 b have the same structure as the sub air chamber member 10.

  Then, the communication holes 20a and 20b of the two Helmholtz resonators 19a and 19b of the first auxiliary air chamber member 10a and the communication holes 20c and 20d of the two Helmholtz resonators 19c and 19d of the second auxiliary air chamber member 10b. Are provided apart from each other in the circumferential direction at an angle of 90 ° around the wheel rotation center Ax.

  According to the vehicle wheel 100 according to such another embodiment, it is possible to prevent the occurrence of noise reduction unevenness and one of the first sub air chamber member 10a and the second sub air chamber member 10b. Since the wheel unbalance (static balance) caused by the above is canceled out by the wheel unbalance (static balance) caused by the other, the counterweight B for making it face the auxiliary air chamber member 10 when the wheel balance is corrected becomes unnecessary.

Next, a method for attaching the auxiliary air chamber member 10 to the well portion 11c will be described. FIGS. 10A and 10B are process explanatory views illustrating a method of attaching the sub air chamber member 10 to the well portion 11c.
In this embodiment, the auxiliary air chamber member 10 is attached to the well portion 11c as shown in FIGS. 10 (a) and 10 (b), with the edge portion 14a being positioned near the groove portion 17a and the outer peripheral surface of the well portion 11c. It is assumed that a pusher (pressing device) 60 that presses toward 11d is used.

As this pusher 60, what presses the edge part 14a (refer FIG. 10 (a) and (b)) with the air pressure of an air cylinder is mentioned, for example.
10A and 10B, the pusher 60 is indicated by a virtual line (two-dot chain line) for convenience of drawing.

  As the pusher 60 used in the present embodiment, for example, a plate-like member having an edge portion having an arc-shaped contour following the curvature of the auxiliary air chamber member 10 in the longitudinal direction (the wheel circumferential direction X in FIG. 2). Although the pusher 60 applicable to this invention is mentioned, it is not limited to this, A design change can be carried out suitably.

In this attachment method, as shown in FIG. 10A, first, the auxiliary air chamber member 10 is inclined, and the short edge portion 14b is partially fitted into the groove portion 17b.
In FIG. 10A, a pusher 60 indicated by a virtual line is applied to the long edge portion 14a. Reference numeral 11d denotes an outer peripheral surface of the well portion 11c.

Next, as shown in FIG. 10B, when the pusher 60 presses the edge portion 14a toward the outer peripheral surface 11d of the well portion 11c, the auxiliary air chamber member 10 is inclined with respect to the outer peripheral surface 11d of the well portion 11c. As the height decreases, the edge 14b gradually fits into the groove 17b.
At this time, the long edge portion 14 a having spring elasticity is bent according to the pressing force of the pusher 60.

  Further, when the pusher 60 presses the edge portion 14a toward the outer peripheral surface 11d of the well portion 11c, the edge portion 14a is fitted into the groove portion 17a formed on the first vertical wall surface 16a as shown in FIG. At this time, the protrusion 26 fits into the notch 15a (see FIG. 8B) of the vertical wall 15. The auxiliary air chamber member 10 is attached to the well portion 11c by completely fitting the edge portion 14a and the edge portion 14b into the groove portion 17a and the groove portion 17b, respectively.

Next, the effect which the vehicle wheel 100 of this embodiment show | plays is demonstrated.
According to the vehicle wheel 100, the “portion forming the main part of the sub air chamber SC” P on the upper plate 25a of the sub air chamber member 10 is a hump on the side of the top of the vertical wall 15 and the second vertical wall surface 16b. Since it is formed along the line 11g inside the line 11g connecting the top part of the portion 11f, the “sub-air chamber SC of the auxiliary air chamber SC is formed inside the passing line of the bead part 21a of the tire 21 when the tire 21 is assembled. A portion “P” forming the main portion is arranged. In addition, since the “portion forming the main part of the auxiliary air chamber SC” P is arranged along the line 11g, the auxiliary air chamber SC can be expanded to the maximum outside the wheel radial direction Z. It becomes possible. Therefore, according to the vehicle wheel 100, the maximum auxiliary air chamber volume can be secured at a position where the bead portion 21a of the tire 21 is not interfered with when the tire 21 is assembled.
As a result, the vehicle wheel 100 can secure the necessary volume of the auxiliary air chamber SC even when the wheel diameter or wheel width decreases. According to the vehicle wheel 100, the volume reduction of the sub air chamber SC is reduced, so that the silencing effect on the air column resonance sound of the tire is lowered, and the problem that the road noise cannot be sufficiently reduced is solved. Can do.

  Further, according to the vehicle wheel 100, since the volume of the auxiliary air chamber SC can be secured large, when the communication holes 20a and 20b are separated from each other by 90 ° so as to prevent the occurrence of the noise non-uniformity. The degree of freedom in design can be improved.

  In the above-described embodiment, the auxiliary air chamber member 10 has a structure in which two Helmholtz resonators 19a and 19b are integrally formed. Only that may be formed.

DESCRIPTION OF SYMBOLS 10 Sub air chamber member 10a 1st sub air chamber member 10b 2nd sub air chamber member 11c Well part 11d Outer peripheral surface 11f Hump part 11g Line 13 Main part 13a Full width part 13b Swelling part 14a Edge (locking part) )
14b Edge (locking part)
15 vertical wall 15a cutout portion 16a first vertical wall surface 16b second vertical wall surface 17a groove portion 17b groove portion 18 tube 19a helmholtz resonator 19b helmholtz resonator 19c helmholtz resonator 19d helmholtz resonator 20a communication hole 20b communication hole 20b 20d communication hole 21 tire 21a bead part (tire bead part)
25a Top plate 25b Bottom plate 26 Protruding part 35 Coupling part 60 Pusher 100 Vehicle wheel MC Tire air chamber SC Secondary air chamber X Wheel circumferential direction Y Wheel width direction W Partition wall Z Wheel radial direction

Claims (2)

A vehicle wheel having a sub air chamber member as a Helmholtz resonator in the tire air chamber on the outer peripheral surface of the well portion,
A first vertical wall surface formed to extend in a circumferential direction of the outer peripheral surface on a vertical wall erected on the outer peripheral surface of the well portion;
A second vertical wall surface formed on one rising portion of the well portion so as to extend in the circumferential direction and facing the first vertical wall surface in the width direction of the outer peripheral surface;
With
The top of the vertical wall is lower in height from the outer peripheral surface than the top of the hump on the second vertical wall surface side, and the portion between the vertical wall and the other rising portion of the well portion is the tire. Used to drop the tire bead when assembling,
The auxiliary air chamber member is
Fit between the first vertical wall surface and the second vertical wall surface,
A main body comprising: a bottom plate on the outer peripheral surface side; an upper plate that forms a sub air chamber between the bottom plate; and a communication hole that communicates the sub air chamber with the tire air chamber;
A locking portion that is formed at both ends of the main body portion in the width direction and locks the main body portion to each of the first vertical wall surface and the second vertical wall surface;
With
In the cross section in the width direction of the main body, the portion related to the formation of the main part of the sub air chamber in the upper plate connects the top of the vertical wall and the top of the hump on the second vertical wall surface side. A vehicle wheel, wherein the vehicle wheel is formed along the connecting line on an inner side in a wheel radial direction of the wire. The vehicle wheel according to claim 1,
A vehicle wheel, wherein the pair of auxiliary air chamber members are arranged so as to face each other across a wheel rotation center.

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