JP2015174503A - vehicle wheel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle wheel capable of securing a sufficiently large volume of a sub-air chamber and effectively suppressing the deformation of a sub-air chamber member.SOLUTION: A vehicle wheel 1 comprises a body portion 13 (sub-air chamber member 10) that includes a bottom plate 25b and a top plate 25a forming a sub-air chamber SC between the bottom plate 25b and the top plate 25a, a second region 13a and a first region 13b are defined in the body portion 13 to be aligned in a wheel width direction Y, the first region 13b being smaller than the second region 13a in height on an outer circumferential surface of a well portion, connection portions 33a and 34a are provided in the body portion 13 to partially connect the top plate 25a to the bottom plate 25b, and the connection portions 33a and 34a are formed so that central axes of the connection portions 33a and 34a are inclined toward the first region 13b in a cross-sectional view along the wheel width direction Y.

Description

  The present invention relates to a vehicle wheel.

Conventionally, as a wheel for silencing the air column resonance sound in the tire air chamber, a wheel having a sub air chamber member functioning as a Helmholtz resonator on the tire air chamber on the outer peripheral surface of the well portion is known (for example, Patent Document 1).
The auxiliary air chamber member of the wheel includes a main body having an auxiliary air chamber communicating with the tire air chamber inside. The upper surface of the main body is a flat surface that is substantially parallel to the outer peripheral surface of the well portion.
Moreover, in this vehicle wheel, a plurality of coupling portions that couple the upper surface and the lower surface of the main body portion are provided along the circumferential direction of the wheel. These coupling portions increase the rigidity of the main body.

Japanese Patent No. 4551422

By the way, in order for the auxiliary air chamber member to sufficiently exhibit the performance as a Helmholtz resonator, it is desired to secure a large volume of the auxiliary air chamber.
In a conventional wheel (for example, see Patent Document 1), in order to ensure a large volume of the sub air chamber, it is also possible to bulge the main body portion of the sub air chamber member toward the upper part of the outer peripheral surface of the well portion. It is done. On the other hand, since the well portion is used to drop the tire bead when the tire is assembled, it is necessary to secure the space (bead dropping portion) in the well portion. Therefore, it is conceivable to form a bulging portion that bulges outward in the wheel radial direction and a hollow portion that is recessed inward in the wheel radial direction so as to be aligned in the wheel width direction. According to the vehicle wheel provided with such a sub air chamber member, the volume of the sub air chamber can be enlarged at the bulging portion, and a bead dropping portion can be secured at the recessed portion.
On the other hand, centrifugal force is applied to the auxiliary air chamber member when the wheel rotates. Therefore, in the conventional vehicle wheel, the auxiliary air chamber member is prevented from being deformed by providing the coupling portion in the main body portion.
However, in the main body provided with the bulging portion, the amount of deformation at the bulging portion was found to be the largest as a result of a simulation test described later by the present inventors. In particular, assuming a line segment connecting the upper surface and the lower surface of the bulging portion, the portion of the bulging portion near the center in the wheel width direction on the upper surface and the portion closer to the outer side in the wheel width direction on the lower surface are connected. It has also been found that the amount of change becomes the largest in the direction in which the length of the line segment becomes the longest.
However, in a conventional vehicle wheel (see, for example, Patent Document 1), the coupling portion is formed such that the central axis thereof is perpendicular to the outer peripheral surface of the well portion.
Therefore, even if the conventional connecting portion of the vehicle wheel is applied to the auxiliary air chamber member having the bulging portion as described above, the deformation of the auxiliary air chamber member cannot be effectively suppressed.

  Accordingly, an object of the present invention is to provide a vehicle wheel that can ensure a sufficiently large volume of the auxiliary air chamber as compared with the conventional one and can effectively suppress deformation of the auxiliary air chamber member. .

  The present invention that has solved the above problems is a vehicle wheel in which a sub air chamber member as a Helmholtz resonator is mounted on an outer peripheral surface of a well portion, and the sub air chamber member is on the outer peripheral surface side of the well portion. And a top plate that forms a sub-air chamber between the bottom plate, and the main body portion is arranged in the wheel width direction in a cross-sectional view along the wheel width direction. The second region and the first region having a lower height on the outer peripheral surface of the well portion than the second region are defined, and the main body portion is provided with one of the top plate and the bottom plate. A plurality of coupling portions that are recessed from the both into the auxiliary air chamber and partially couple the upper plate and the bottom plate are provided along the circumferential direction of the wheel in the second region. The section is the central axis of the coupling part in a cross-sectional view along the wheel width direction. There characterized in that it is inclined in a direction toward the first region side on the outer circumferential surface of the well portion.

According to this vehicle wheel, the volume of the auxiliary air chamber can be increased in the first region of the main body corresponding to the bulging portion, and the wheel diameter of the second region corresponding to the hollow portion. A bead dropping part can be secured outside the direction.
Further, in this vehicle wheel, the central axis of the coupling portion provided in the second region is inclined toward the first region on the outer peripheral surface of the well portion. As a result, the inclination of the central axis line connects the line segment with the largest amount of change in the second region, that is, the upper surface portion near the center in the wheel width direction and the lower surface portion near the outside in the wheel width direction. It approaches the slope of the line segment. Therefore, the auxiliary air chamber member having such a coupling portion with the inclination of the central axis effectively suppresses deformation of the main body when a centrifugal force is applied.

Further, in such a vehicle wheel, the plurality of coupling portions are provided along the wheel circumferential direction in the first region, and the central axis of the coupling portion in the first region is the second region. It can also be set as the structure set to the same inclination as the said central axis of the said connection part.
In this vehicle wheel, since the first region also includes the coupling portion having the central axis of the same inclination as the second region, the deformation of the auxiliary air chamber member is more effectively suppressed.

Further, in such a vehicle wheel, the sub air chamber member is a resin molded body using a mold, and the extending direction of the central axis of the coupling portion is a mold release direction of the resin molded body It can also be set as the structure set so that it may correspond.
According to this vehicle wheel, resin molding of the auxiliary air chamber member is facilitated, and the production efficiency of the wheel is further improved.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to ensure the volume of a sub air chamber sufficiently larger than before, the vehicle wheel which suppresses a deformation | transformation of a sub air chamber member effectively can be provided.

1 is a perspective view of a vehicle wheel according to an embodiment of the present invention. It is the elements on larger scale in the II-II cross section of FIG. It is a whole perspective view of a sub air chamber member. (A) is the top view which looked at the sub air chamber member of FIG. 3 from the wheel radial direction outer side, (b) is the bottom view which looked at the sub air chamber member of FIG. 3 from the wheel radial direction inner side. It is VV sectional drawing of FIG. (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. (A) is the elements on larger scale of the edge part of the sub air chamber member in the vehicle wheel which concerns on embodiment of this invention, The figure showing the deformation distribution by centrifugal force, (b) is as a comparative example It is a partial expansion perspective view of the edge part of the sub air chamber member in the vehicle wheel of this, and is a figure showing deformation amount distribution by centrifugal force. It is composition explanatory drawing of the wheel for vehicles concerning other embodiments of the present invention.

Next, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
FIG. 1 is a perspective view of a vehicle wheel 1 according to an embodiment of the present invention.
As shown in FIG. 1, the vehicle wheel 1 of the present embodiment has a plurality of auxiliary air chamber members 10 as Helmholtz resonators at equal intervals in the wheel circumferential direction X. Incidentally, in the present embodiment, it is assumed that there are four auxiliary air chamber members 10.

The vehicle wheel 1 according to the present embodiment includes a rim 11 and a disk 12 for connecting the rim 11 to a hub (not shown). The auxiliary air chamber member 10 is fitted and attached on the outer peripheral surface 11 d of the well portion 11 c in the rim 11.
Hereinafter, the auxiliary air chamber member 10 will be described after describing the rim 11.

<Rim>
2 is a partially enlarged cross-sectional view taken along the line II-II in FIG. In FIG. 2, the vicinity of the bead portions 21 a and 21 b of the tire 20 assembled to the rim 11 is partially drawn with phantom lines (two-dot chain lines). Incidentally, the bead portions 21a and 21b are for attaching the tire 20 to the rim 11 by the tightening force thereof. The bead portions 21a and 21b are not structurally related to the bead 30 described later.
The rim 11 has a well portion 11c that is recessed toward the inner side in the wheel radial direction Z (the lower side in FIG. 2) between the bead sheets 11a and 11b on which the bead portions 21a and 21b are arranged.

The well portion 11c in the present embodiment is formed by being surrounded by a trunk portion T and a pair of rising portions S1 and S2 facing each other in the wheel width direction Y across the trunk portion T.
The trunk | drum T is exhibiting the cylindrical shape used as the substantially same diameter over the wheel width direction Y. As shown in FIG.
The rising portions S1 and S2 are formed so as to rise from the surface of the body portion T, that is, from the outer peripheral surface 11d of the well portion 11c, to the outside in the wheel radial direction Z (the upper side in FIG. 2).

  The rising portion S1 defines a first vertical wall surface 16a between the end portion of the outer peripheral surface 11d and the hump portion H1. The first vertical wall surface 16a is inclined so as to have an ascending gradient from the end portion of the outer peripheral surface 11d to the hump portion H1 when the outer side in the wheel radial direction Z is viewed upward. The rising portion S2 defines a second vertical wall surface 16b between the end portion of the outer peripheral surface 11d and the hump portion H2. The second vertical wall surface 16b is inclined so as to have an ascending gradient from the end portion of the outer peripheral surface 11d to the hump portion H2 when the outer side in the wheel radial direction Z is viewed upward.

  The first vertical wall surface 16a has a protruding portion P1 that protrudes toward the inner side of the wheel in the wheel width direction Y at approximately the middle between the end portion of the outer peripheral surface 11d and the hump portion H1. The protrusion P1 extends in the wheel circumferential direction X (see FIG. 1) on the first vertical wall surface 16a and has an annular shape around a wheel rotation axis (not shown).

  The projecting portion P1 and the first vertical wall surface 16a cooperate to form a groove portion 17a, and the groove portion 17a is fitted into the groove portion 17a by contacting the tip of the edge portion 14a of the auxiliary air chamber member 10 against the groove portion 17a. . The groove portion 17a is formed along the wheel circumferential direction X (see FIG. 1) on the first vertical wall surface 16a.

  On the second vertical wall surface 16b, a protruding portion P2 is formed adjacent to the hump portion H2. The projecting portion P2 is formed so as to project inward of the wheel in the wheel width direction Y, extends on the second vertical wall surface 16b in the wheel circumferential direction X (see FIG. 1), and has a wheel rotation shaft (not shown). It has an annular shape at the center.

  The projecting portion P2 and the second vertical wall surface 16b cooperate to form a groove portion 17b, and the groove portion 17b is fitted into the groove portion 17b by contacting the tip of the edge portion 14b of the auxiliary air chamber member 10 against the groove portion 17b. . The groove portion 17b is formed along the wheel circumferential direction X (see FIG. 1) on the second vertical wall surface 16b.

  In FIG. 2, the symbol MC is a tire air chamber. Reference numeral 13 denotes a main body portion of the sub air chamber member 10 to be described next, reference numeral 13a denotes a second area of the main body section 13, reference numeral 13b denotes a first area of the main body section 13, and reference numeral Reference numeral 13c denotes a connection area of the main body 13, reference numeral 13d denotes a skirt area of the main body 13, and reference numeral 13e denotes a boundary between the connection area 13c and the second area 13a. Reference numeral 25 a is an upper plate constituting the main body 13, reference numeral 25 b is a bottom plate constituting the main body 13, and reference numerals 25 c and 25 d are side plates constituting the main body 13. Reference numerals 25e and 25f are joints between the upper plate 25a and the side plates 25c and 25d. Reference numeral 15 denotes a recess formed in the main body 13, reference numeral 30 denotes a bead, reference numerals 33a and 33b denote upper coupling parts, reference numerals 34a and 34b denote lower coupling parts, and reference numeral SC. Is a secondary air chamber.

<Sub-air chamber member>
FIG. 3 is an overall perspective view of the auxiliary air chamber member 10. In FIG. 3, the symbol X indicates the wheel circumferential direction when the auxiliary air chamber member 10 is attached to the well portion 11 c (see FIG. 1) of the rim 11 (see FIG. 1), and the symbol Y indicates the wheel width direction. Is shown.

  As shown in FIG. 3, 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, and edge portions 14 a and 14 b.

(Main body)
The main body 13 is formed long in the circumferential direction so as to be curved in accordance with the curvature in the circumferential direction of the outer peripheral surface 11d (see FIG. 1). A plurality of beads 30, which will be described in detail later, are formed on the inner side of the main body 13 in the wheel radial direction Z (the lower side in the drawing of FIG. 3).
In FIG. 3, reference numeral 15 denotes a recess described below.

Returning to FIG. 2, the recess 15 causes a part of the outer side of the main body 13 in the wheel radial direction Z (upper side of the drawing in FIG. 2) to be recessed inward of the wheel radial direction Z (lower side of the drawing in FIG. 2). It is formed as follows.
The recess 15 is for dropping the bead portions 21a and 21b of the tire 20 when assembling the tire (bead drop portion).

  The recess 15 in the present embodiment is formed in a region closer to the disk 12 than the central portion of the main body 13 in the wheel width direction Y, but is not limited to this. The recess 15 can also be formed on the opposite side of the disk 12 with the central portion in between.

In the main body 13 in the present embodiment, a second region 13a and a first region 13b are defined so as to be aligned in the wheel width direction Y in a cross-sectional view along the wheel width direction Y.
The first region 13b is formed so as to be recessed in the wheel radial direction Z with respect to the second region 13a, and the recess 15 is formed in the first region 13b.
That is, the first region 13b is formed to have a lower height on the outer peripheral surface 11d of the well portion 11c than the second region 13a. In other words, the first region 13b is formed to have a diameter smaller than that of the second region 13a with reference to the wheel rotation center (not shown).

  More specifically, the first region 13b connects the skirt region 13d having a lower height on the outer peripheral surface 11d of the well portion 11c and the skirt region 13d and the second region 13a than the second region 13a. A connection region 13c. This connection region 13c is a part of the first region 13b, and is intended to prevent a step from being formed between the second region 13a and the first region 13b.

In the present embodiment, the skirt region 13d is curved so as to have a slight upward slope toward the connection region 13c, but it is also possible to form an upward slope linearly. Also, the skirt region can be horizontal without forming an ascending slope.
In the present embodiment, the connection region 13c is curved with a curvature larger than that of the skirt region 13d and has an upward slope toward the second region 13a.
Incidentally, the boundary between the skirt region 13d and the connection region 13c in the present embodiment is defined by the transition between the curvature of the skirt region 13d and the curvature of the connection region 13c.
In addition, when any of the skirt region 13d and the connection region 13c forms a linear upward slope, the inflection point becomes a boundary between the skirt region 13d and the connection region 13c.

  The main body 13 has an upper plate 25a, a bottom plate 25b, and a pair of side plates 25c and 25d.

The upper plate 25a forms the upper surface of the main body 13 (the outer surface in the wheel radial direction Z). The upper plate 25a is arranged at a predetermined interval above the bottom plate 25b described below, thereby forming a sub air chamber SC between the upper plate 25a and the bottom plate 25b.
The upper plate 25a is bent in an inverted S shape according to the position where the recess 15 is formed. In other words, the upper plate 25a is provided on the main body 13 with the second region 13a that matches the height of the rising portion S2, the hem region 13d that is lower than the second region 13a, and the second region 13a and the hem. It is bent so as to form a connection region 13c between the region 13d.
Both end portions of the upper plate 25a in the wheel width direction Y are curved so as to be recessed in the wheel radial direction Z, and the pressing portions 35a and 35b when the auxiliary air chamber member 10 is mounted on the well portion 11c (FIG. 5). See).

  The bottom plate 25b is composed of a plate formed so as to follow the outer peripheral surface 11d of the well portion 11c. That is, the bottom plate 25b is formed to be flat in the wheel width direction Y, and is curved in the wheel circumferential direction X (see FIG. 1) with substantially the same curvature as the outer peripheral surface 11d. Note that the width in the wheel width direction Y of the bottom plate 25b in this embodiment is set to match the width in the wheel width direction Y of the outer peripheral surface 11d including the chamfered portions of the corners at both ends.

The side plate 25c and the side plate 25d are formed so as to rise from the both ends of the bottom plate 25b in the wheel width direction Y to the outside in the wheel radial direction Z (the upper side in FIG. 2).
More specifically, the side plate 25c rises from one end of the bottom plate 25b of the well portion 11c and is formed along the inclined surface of the first vertical wall surface 16a.
Further, the side plate 25d rises from the other end of the bottom plate 25b of the well portion 11c and is formed so as to follow the inclined surface of the second vertical wall surface 16b.

The upper end of the side plate 25c rising from the bottom plate 25b and the upper end of the side plate 25d are joined to both ends in the wheel width direction Y of the upper plate 25a.
Incidentally, since the upper plate 25a has a height difference between the second region 13a and the first region 13b, the length of the side plate 25c in the wheel radial direction Z is shorter than the length of the side plate 25d. The length of the side plate 25c in the present embodiment is set to be about half of the length of the side plate 25d, but is not limited to this.
The auxiliary air chamber SC is surrounded by the upper plate 25a, the bottom plate 25b, and the pair of side plates 25c and 25d, and is formed inside the main body portion 13.

  4A to be referred to next is a top view of the auxiliary air chamber member 10 of FIG. 3 as viewed from the outside in the wheel radial direction Z (upper side of the drawing in FIG. 3), and FIG. 4B is an auxiliary view of FIG. FIG. 4 is a bottom view of the air chamber member 10 as viewed from the inner side in the wheel radial direction Z (the lower side in the drawing of FIG. 3). 5 is a cross-sectional view taken along the line VV in FIG.

  As shown in FIG. 4A, the auxiliary air chamber member 10 has a long rectangular shape in plan view. The planar shape of the main body 13 has a substantially rectangular shape that is slightly smaller than the planar shape of the auxiliary air chamber member 10.

On the upper surface side of the main body 13, the second region 13a, the first region 13b, the connection region 13c, and the bottom region 13d are formed to extend in the longitudinal direction.
A plurality of upper coupling portions 33a (11 in this embodiment) are formed on the upper surface side of the second region 13a along the longitudinal direction thereof. An upper coupling portion 33b is formed at the boundary between the connection region 13c and the skirt region so as to straddle the connection region 13c and the skirt region 13d. A plurality of the upper coupling portions 33b are formed in the wheel width direction Y so as to be aligned with the upper coupling portion 33a, and there are 11 upper coupling portions 33b in the present embodiment.

As shown in FIG. 4B, a lower coupling portion 34 a is formed on the lower surface side of the main body portion 13 at a position corresponding to the upper coupling portion 33 a (see FIG. 4A) on the upper surface side of the main body portion 13. Has been. That is, the lower coupling portion 34a is formed on the upper surface side of the second region 13a.
Further, a lower coupling portion 34b is formed at a position corresponding to the upper coupling portion 33b (see FIG. 4A). That is, the lower coupling portion 34b is formed so as to straddle the connection region 13c and the bottom region 13d at the boundary between the connection region 13c (see FIG. 4A) and the bottom region 13d (see FIG. 4A). Has been.
In FIGS. 4A and 4B, reference numeral 18 denotes a tubular body 18 that will be described in detail later.

  As shown in FIG. 5, these lower coupling portions 34a and 34b have a substantially bottomed cylindrical shape. And the upper side coupling | bond part 33a and the lower side coupling | bond part 34a are mutually joined by bottom part. A central axis 37a of the coupling portion in which the upper coupling portion 33a and the lower coupling portion 34a are integrated is on the outer peripheral surface 11d (see FIG. 2) of the well portion 11c (see FIG. 2) toward the first region 13b side. Inclined in the direction of heading.

In the present embodiment, the inclination angle θ of the central axis 37a is set to 0 ° <θ <90 °, preferably 30 ° <θ <60 °, with respect to the outer peripheral surface 11d of the well portion 11c.
Further, the upper coupling portion 33b and the lower coupling portion 34b are also joined to each other at the bottoms. The central axis 37b of the coupling portion in which the upper coupling portion 33b and the lower coupling portion 34b are integrated is inclined at the same angle as the central axis 37a.
The lower and upper coupling portions 33a and 33b and the lower coupling portions 34a and 34b are joined together so that the upper plate 25a and the bottom plate 25b are integrated, and a sub-air chamber SC is formed inside thereof.

In FIG. 5, reference numeral 38 denotes a predetermined position near the center in the wheel width direction Y on the upper surface in the second region 13 a of the main body 13 and a predetermined position near the outside in the wheel width direction Y on the lower surface in the second region 13 a. The length of the line segment connecting the positions is the longest line segment (this line segment 38 may be referred to as “longest line segment 38”).
Incidentally, when the central axis 37a is inclined in the direction toward the first region 13b on the outer peripheral surface 11d of the well portion 11c, the inclination of the central axis 37a approaches the inclination of the longest line segment 38. .

  In the present embodiment, the upper plate 25a and the bottom plate 25b are integrally joined by the upper coupling portions 33a and 33b and the lower coupling portions 34a and 34b formed to be recessed from both the upper plate 25a and the bottom plate 25b. However, according to the present invention, the upper plate 25a and the bottom plate 25b are connected to either the upper plate 25a or the bottom plate 25b by connecting a coupling portion (not shown) formed by partially recessing the upper plate 25a and the bottom plate 25b. The plate 25a and the bottom plate 25b may be integrally joined. In this case, the central axis 37a corresponds to one of the upper coupling portion 33a and the lower coupling portion 34a. The central axis 37b corresponds to any one of the upper coupling portion 33b and the lower coupling portion 34b.

As shown in FIG. 2, the bead 30 extends on the lower surface side (the inner side in the wheel radial direction Z) of the main body 13 so as to extend in a direction intersecting the first vertical wall surface 16 a and the second vertical wall surface 16. Is formed. Further, a plurality of beads 30 are formed in a row in the wheel circumferential direction X.
In other words, the bead 30 is formed in a groove shape so as to cross the main body 13 in the wheel width direction Y, as shown in FIG. A plurality of beads 30 are formed in a direction connecting the lower coupling portion 34a and the lower coupling portion 34b, and the number of the beads 30 in the present embodiment is eleven.

As shown in FIG. 5, the bead 30 is formed such that the bottom plate 25 b is partially depressed toward the upper plate 25 a side.
Further, at both ends of the main body 13 in the wheel width direction Y, as described above, the joints 25g and 25h are joined so that the upper plate 25a and the bottom plate 25b forming the bead 30 are integrated on the bead 50. Is formed.
The both end portions are pressing portions 35a and 35b when the auxiliary air chamber member 10 is pressed and attached to the well portion 11c (see FIG. 2) side.

(Tube)
Next, the tubular body 18 (see FIG. 3) will be described.
Returning to FIG. 3 again, the tubular body 18 is an end portion in the longitudinal direction (wheel circumferential direction X) of the auxiliary air chamber member 10, and is one of the short sides of the auxiliary air chamber member 10 (wheel width direction Y). It is biased to the side edge. 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 is formed so as to protrude from the main body portion 13 in the longitudinal direction (wheel circumferential direction X) of the auxiliary air chamber member 10. More specifically, as shown in FIG. 4A, the tube body 18 is provided at an end portion of the main body portion 13 in the wheel circumferential direction X, and from the second region 13a of the main body portion 13 in the wheel circumferential direction X. It is formed to protrude.
As shown in FIG. 3, a communication hole 18 a is formed inside the tube body 18. The cross-sectional shape of the communication hole 18a in the present embodiment is a vertically long substantially rectangular shape in the wheel radial direction Z. The communication hole 18a allows the tire air chamber MC (see FIG. 2) to communicate with the auxiliary air chamber SC (see FIG. 2).
And in this embodiment, as shown in FIG.4 (b), the side plate 25d is extended from the main-body part 13 in the wheel circumferential direction X, and forms the side wall of the tubular body 18. As shown in FIG.
Further, as shown in FIG. 5, the outer side of the tube body 18 in the wheel radial direction Z (the upper side in FIG. 5) is located outside the wheel radial direction Z of the main body 13 at the position where the tube body 18 protrudes. The position is shifted to the inner side in the wheel radial direction Z as shown by the white arrow in FIG.

  The length of the communication hole 18a is set so as to satisfy the equation for obtaining the resonance 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 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 sub-air chamber SC L (m): Length of the communication hole 18a S (m ² ): Cross-sectional area of the opening of the communication hole 18a α: Correction coefficient The resonance frequency f ₀ is Matched to resonance frequency of tire air chamber MC

(Edge)
Next, the edges 14a and 14b (see FIG. 3) will be described.
As shown in FIG. 3, 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.

  More specifically, as shown in FIG. 2, the edge portion 14a extends from the joint portion 25e between the upper plate 25a and the side plate 25c toward the outer side in the wheel radial direction Z (the upper side in FIG. 2). Is formed. And the edge part 14a in this embodiment is extended from the junction part 25e so that the rising direction of the side plate 25c may be followed.

  Moreover, the edge part 14b is formed so that it may extend toward the outer side (paper surface upper side of FIG. 2) of the wheel radial direction Z from the junction part 25f of the upper board 25a and the side board 25d, as shown in FIG. Yes. And the edge part 14b in this embodiment is extended from the junction part 25f so that the rising direction of the side plate 25d may be met.

  Of these two edge portions 14a, 14b, the position of the edge portion 14a on the second region 13a side is shifted to the outside in the wheel radial direction Z rather than the position of the edge portion 14b on the first region 13b side. .

And the front-end | tip of the edge part 14a is fitted in the groove part 17a, and the front-end | tip of the edge part 14b is fitted in the groove part 17b. As a result, the auxiliary air chamber member 10 is mounted on the well portion 11 c of the rim 11.
Incidentally, it is desirable that the extending direction of the edge portions 14a and 14b coincides with the rising direction of the side plates 25c and 25d. However, if the extending direction extends along the rising direction of the side plates 25c and 25d, the edge portions 14a and 14b extend slightly. Deviation in the outgoing direction is allowed.

  The thickness of the edge portions 14a and 14b in this embodiment is set to be substantially the same as the thickness of the upper plate 25a, the bottom plate 25b, and the side plates 25c and 25d. And these edge parts 14a and 14b have spring elasticity by selecting the thickness and material suitably.

  The sub 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 may be formed of other materials such as metal. 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.

<Attachment method of auxiliary air chamber member>
Next, a method for attaching the auxiliary air chamber member 10 to the well portion 11c will be described. 6A and 6B are process explanatory views for explaining a method of attaching the auxiliary air chamber member 10 to the well portion 11c.
In the present embodiment, for attaching the sub air chamber member 10 to the well portion 11c, a pair of pushers (pressing devices) 50 that press the sub air chamber member 10 toward the outer peripheral surface 11d of the well portion 11c (FIG. 6A). And (b)).

Examples of these pushers 50 include those that generate a pressing force with the air pressure of an air cylinder.
In FIGS. 6A and 6B, the pusher 50 is indicated by a virtual line (two-dot chain line) for convenience of drawing.

  As the pusher 50 used in the present embodiment, for example, a plate-like member having an edge portion having an arc-shaped contour that follows the curvature of the auxiliary air chamber member 10 in the longitudinal direction (the wheel circumferential direction X in FIG. 3). However, the pusher 50 applicable to the present invention is not limited to this, and can be changed in design as appropriate.

In this attachment method, as shown in FIG. 6A, first, the auxiliary air chamber member 10 is disposed on the well portion 11c. Then, the pair of pushers 50, 50 are pressed against the upper plate 25a near the edges 14a, 14b, specifically, the pressing portions 35a, 35b (see FIG. 5), and a load is applied in the direction of the white arrow. It is hung.
As a result, as the auxiliary air chamber member 10 approaches the outer peripheral surface 11d of the well portion 11c, the edge portions 14a and 14b are not shown, but the inner side of the wheel in the wheel width direction Y is caused by the reaction force received from the projecting portions P1 and P2. Displacement toward

  And as shown in FIG.6 (b), when the pushers 50 and 50 press the upper plate 25a and the bottom plate 25b is arrange | positioned along the outer peripheral surface 11d of the well part 11c, the edge parts 14a and 14b will be, Recovered by the elastic force, the tip is fitted into the grooves 17a and 17b, respectively. Thereby, the sub air chamber member 10 is attached on the outer peripheral surface 11d of the well portion 11c, and a series of steps of this attachment method is completed.

  In the present embodiment, as described above, it is assumed that both ends of the main body 13 are pressed by the pusher 50 (see FIGS. 6A and 6B). It is not limited to.

  For example, the auxiliary air chamber member 10 can be tilted so that the edge portion 14a is fitted in the groove portion 17a in advance, and then the pressing portion 35b is pressed by the pusher 50 so that the edge portion 14b is fitted in the groove portion 17b. . Alternatively, the edge portion 14b may be fitted in the groove portion 17b in advance, and then the pressing portion 35a may be pressed by the pusher 50 so that the edge portion 14a is fitted in the groove portion 17a.

  Thus, the vehicle wheel 1 applied to the mounting method of pressing only one of the pressing portions 35a and 35b and attaching the auxiliary air chamber member 10 to the well portion 11c needs to provide two pressing portions 35a and 35b. Alternatively, either one of the pressing portion 35a and the pressing portion 35b may be provided.

Next, the effect which the wheel 1 for vehicles of this embodiment show | plays is demonstrated.
As shown in FIG. 2, the vehicle wheel 1 is engaged with the edge portions 14a and 14b and locked in the groove portions 17a and 17b of the first and second vertical wall surfaces 16a and 16b.

  By the way, a centrifugal force is generated in the main body portion 13 of the auxiliary air chamber member 10 attached on the outer peripheral surface 11d of the well portion 11c when the wheel rotates.

FIG. 7A is a partially enlarged perspective view of the end portion of the auxiliary air chamber member in the vehicle wheel 1 according to the embodiment of the present invention, and shows a deformation distribution due to centrifugal force, FIG. 7B. These are the partial expansion perspective views of the edge part of the sub air chamber member in the vehicle wheel 100 as a comparative example, and are the figures showing deformation amount distribution by centrifugal force. FIGS. 7A and 7B are diagrams showing the deformation distribution of the main body 13 due to the centrifugal force generated at the assumed maximum rotation speed of the wheel. In FIGS. 7A and 7B, the deformation amount is represented by a shaded portion that is divided into three types according to the degree of shading. The amount of deformation here is defined by the lifting length in the centrifugal direction when the centrifugal force generated at the assumed maximum rotational speed is applied to the auxiliary air chamber member. Among the shaded portions in FIGS. 7A and 7B, the shaded portion 10a indicates “a portion with a large amount of deformation”, and the shaded portion 10b indicates “a portion with a medium amount of deformation”. The shaded portion 10c indicates “a portion with a small amount of deformation”, and the white portion 10d indicates “a portion with almost no deformation”.
Incidentally, the amount of deformation is obtained by conducting a simulation test by CAE (Computer Aided Engineering).

As shown in FIG. 5, the vehicle wheel 1 according to the present embodiment (see FIG. 7A) has a central axis line between the upper coupling portion 33 a and the lower coupling portion 34 a of the second region 13 a of the main body portion 13. 37a inclines in the direction which goes to the 1st area | region 13b side on the outer peripheral surface 11d of the well part 11c.
Incidentally, the central axis 37b of the upper coupling portion 33b and the lower coupling portion 34b of the first region 13b has the same inclination angle as the central axis 37a.

  On the other hand, in the vehicle wheel 100 according to FIG. 7B according to the comparative example, although not shown, the central axis 37a between the upper coupling portion 33a and the lower coupling portion 34a of the second region 13a is a well portion. It extends in a direction perpendicular to the outer peripheral surface 11d of 11c (see FIG. 2). A central axis 37b between the upper coupling portion 33b and the lower coupling portion 34b of the first region 13b also extends in a direction perpendicular to the outer peripheral surface 11d of the well portion 11c (see FIG. 2).

As shown in FIG. 7B, in the vehicle wheel 100 according to the comparative example, a “part with a large deformation amount” 10a is generated in the first region 13b.
On the other hand, in the vehicle wheel 1 according to the present embodiment, as shown in FIG. 7A, most of the main body portion 13 is a “part with a small deformation amount” 10c. Further, the maximum deformation amount of the vehicle wheel 1 according to the present embodiment is reduced by about 30% from the maximum deformation amount of the vehicle wheel 100 according to the comparative example.

  As described above, according to the vehicle wheel 1 according to the present embodiment, the central axis 37a between the upper coupling portion 33a and the lower coupling portion 34a of the second region 13a is the first on the outer peripheral surface 11d of the well portion 11c. Since it is inclined in the direction toward the first region 13b, the inclination of the central axis 37a can be brought close to the inclination of the longest line segment 38, and as a result, deformation of the auxiliary air chamber member 10 due to centrifugal force is suppressed. It was confirmed.

In addition, since the second region 13a and the first region 13b are gently continuous by the connection region 13c, no step is formed between the second region 13a and the first region 13b. Therefore, according to the vehicle wheel 1, the centrifugal force generated in the connection region 13c is dispersed. Therefore, according to the vehicle wheel 1, deformation of the auxiliary air chamber member 10 due to centrifugal force is suppressed.
Moreover, according to this vehicle wheel 1, since it curves concavely from the skirt area | region 13d of the 1st area | region 13b to the connection area | region 13c, a deformation | transformation of the sub air chamber member 10 by a centrifugal force is prevented more reliably.

Moreover, according to this vehicle wheel 1, since the second region 13a and the first region 13b are further smoothly continued by the boundary region 13e, the deformation of the auxiliary air chamber member 10 is further suppressed.
Therefore, according to the vehicle wheel 1 of the present embodiment, the limit rotational speed of the wheel (limit rotational speed at which the auxiliary air chamber member 10 is detached from the well portion 11c) can be set higher than before.

  In addition, the vehicle wheel 1 includes the tire 20 at the time of assembling the tire 20 on the skirt region 13d that is further lower than the first region 13b that is lower than the second region 13a of the main body 13. A so-called bead drop portion into which the bead portions 21a and 21b are dropped is formed. In addition, the sub-air chamber SC having a larger volume can be formed in the second region 13a having a height higher than that of the first region 13b.

  Further, since the auxiliary air chamber member 10 is attached to the rising portions S1 and S2 of the rim 11 forming the well portion 11c, the vehicle wheel 1 is different from the conventional vehicle wheel (for example, see Patent Document 1), There is no need to stand a vertical wall on the outer peripheral surface 11d of the well portion 11c. Therefore, according to the vehicle wheel 1 of the present embodiment, a simple structure in which the vertical wall is omitted is obtained.

  Moreover, this vehicle wheel 1 omits the vertical wall, so that the auxiliary air chamber member 10 on the outer peripheral surface 11d of the well portion 11c is compared with a conventional vehicle wheel (see, for example, Patent Document 1). A large arrangement space can be secured. Therefore, according to the vehicle wheel 1 of the present embodiment, the auxiliary air chamber SC formed in the auxiliary air chamber member 10 (main body portion 13) can be enlarged.

  Further, in the vehicle wheel 1, the main body 13 of the auxiliary air chamber member 10 has a recess 15 into which the beads 21 a and 21 b of the tire 20 are dropped into a partial region outside the wheel radial direction Z when the tire 20 is assembled. Have Therefore, according to the vehicle wheel 1, the auxiliary air chamber SC formed in the auxiliary air chamber member 10 (main body portion 13) can be enlarged while maintaining the ease of assembly of the tire 20.

Further, in the vehicle wheel 1, the upper coupling portion 33a, 33b and the lower coupling portion 34a, 34b are joined to each other in the auxiliary air chamber SC, and the upper plate 25a and the bottom plate 25b are integrated. The mechanical strength of the auxiliary air chamber member 10 is further improved.
Moreover, according to the vehicle wheel 1, since the upper coupling portions 33a and 33b and the lower coupling portions 34a and 34b are joined to suppress the volume variation of the auxiliary air chamber SC, the silencing function is more effectively exhibited. Can be made.

  Further, this vehicle wheel 1 is different from a sub air chamber member of a conventional vehicle wheel (see, for example, Patent Document 1), and its main body 13 has side plates 25c and 25d in addition to an upper plate 25a and a bottom plate 25b. It has. The edge portions 14a and 14b extend from the joint portions 25e and 25f between the side plates 25c and 25d rising from both ends of the bottom plate 25b and the upper plate 25a. Therefore, according to the vehicle wheel 1, even if the main body portion 13 is enlarged and arranged in accordance with the well portion 11 c that is expanded inside the wheel radial direction Z, the edge portions 14 a and 14 b in the wheel radial direction Z are arranged. The position is shifted toward the outside in the wheel radial direction Z by the side plates 25c and 25d.

  According to such a vehicle wheel 1, when the upper plate 25 a is pressed by the pusher 50 and the edges 14 a and 14 b are fitted into the grooves 17 a and 17 b, the edge 14 a and 14 b are loaded while applying a load. , 14b is moved to the grooves 17a, 17b. Thereby, the attachment work of the sub air chamber member 10 by the pusher 50 becomes easy.

Further, in the vehicle wheel 1, unlike the conventional vehicle wheel (see, for example, Patent Document 1), the two groove portions 17a and 17b are respectively formed in the two rising portions S1 and S2 of the well portion 11c. Therefore, even when the well portion 11c is expanded in the wheel radial direction Z, the heights of the rising portions S1 and S2 of the well portion 11c are inevitably increased.
Therefore, according to the vehicle wheel 1 of the present invention, without making a significant design change such as changing the height of the vertical wall as in a conventional vehicle wheel (see, for example, Patent Document 1), The volume of the auxiliary air chamber SC can be increased by expanding the well portion 11c to the inside in the wheel radial direction Z.
That is, even if the wheel width is narrow, the volume of the auxiliary air chamber SC can be increased, the wheel weight is reduced, the fuel consumption is excellent, and the vehicle wheel 1 that is also excellent in the silencing performance can be provided.

  Further, in such a vehicle wheel 1, the pair of side plates 25c, 25d of the auxiliary air chamber member 10 are arranged in the wheel width direction Y of the bottom plate 25b along the rising portions S1, S2 corresponding to the side plates 25c, 25d. It rises from both ends toward the outside in the wheel radial direction Z. Thereby, the vehicle wheel 1 can make maximum use of the accommodation space of the auxiliary air chamber member 10 formed between the two rising portions S1 and S2 of the well portion 11c, and the capacity of the auxiliary air chamber SC. Can be secured larger.

  In the vehicle wheel 1, each of the edge portions 14 a and 14 b of the auxiliary air chamber member 10 extends from the main body portion 13 along the rising direction of each of the side plates 25 c and 25 d. As described above, when the pusher 50 is applied to the upper plate 25a and a load is applied in the direction of the white arrow, the edges 14a and 14b are displaced (bent) in the wheel width direction Y. It fits into the grooves 17a and 17b. Therefore, according to the vehicle wheel 1, the edge portion 14 a, with a small load compared to the case where the edge portion is bent in the wheel radial direction Z as in a conventional vehicle wheel (see, for example, Patent Document 1). 14b can be bent, and the auxiliary air chamber member 10 can be attached to the outer peripheral surface 11d of the well portion 11c with a small load.

Further, according to the vehicle wheel 1, the side plates 25c and 25d of the main body 13 are respectively provided with the first vertical wall surface 16a and the second vertical wall surface defined by the two rising portions S1 and S2 of the well portion 11c. It arrange | positions along each of 16b. Therefore, when the auxiliary air chamber member 10 is disposed on the outer peripheral surface 11d of the well portion 11c, the side plates 25c and 25d of the main body portion 13 do not interfere with the first vertical wall surface 16a and the second vertical wall surface 16b. The edge portions 14a and 14b are fitted into the groove portions 17a and 17b. Therefore, according to the vehicle wheel 1, when the auxiliary air chamber member 10 is attached to the outer peripheral surface 11 d of the well portion 11 c, the load applied to the auxiliary air chamber member 10 can be further reduced.
Thereby, the production efficiency of the vehicle wheel 1 is further improved.

  In addition, since the auxiliary air chamber member 10 is attached to the rising portions S1 and S2 of the rim 11 forming the well portion 11c, the vehicle wheel 1 is different from a conventional vehicle wheel (see, for example, Patent Document 1). There is no need to erect a vertical wall on the outer peripheral surface 11d of the well portion 11c. Therefore, according to the vehicle wheel 1 of the present embodiment, a simple structure in which the vertical wall is omitted is obtained.

As mentioned above, although this embodiment was described, this invention is not limited to the said embodiment, It can implement with a various form.
FIG. 8 is a configuration explanatory view of a vehicle wheel 1 according to another embodiment of the present invention. The auxiliary air chamber member 10 of the vehicle wheel 1 is a resin molded body using a mold (not shown).

In the vehicle wheel 1, the central axis 37 a between the upper coupling portion 33 a and the lower coupling portion 34 a of the second region 13 a of the main body 13 is inclined toward the first region 13 b.
The central axis 37b between the upper coupling portion 33b and the lower coupling portion 34b of the first region 13b has the same inclination angle as the central axis 37a.
Reference numeral 39b in FIG. 8 is a direction in which the auxiliary air chamber member 10 is removed from a mold (not shown), and is set in a direction orthogonal to a line 39a connecting the ends of the edge portions 14a and 14b.
The extending directions of the central axes 37a and 37b are set to coincide with the die cutting direction 39b.

  According to such a vehicle wheel 1, the resin molding of the auxiliary air chamber member 10 is facilitated, and the production efficiency of the vehicle wheel 1 is further improved.

  In the embodiment, in the embodiment, the cross-sectional shape of the communication hole 18a is a substantially rectangular shape, but the cross-sectional shape of the communication hole 18a is a vertically long ellipse or a vertically long polygonal shape. You can also. The cross-sectional shape of the communication hole 18a may not be vertically long.

  Moreover, in the said embodiment, although what has the four sub air chamber members 10 is assumed, this invention equips two or three or five or more sub air chamber members 10 at equal intervals in the wheel circumferential direction. You may have.

DESCRIPTION OF SYMBOLS 1 Vehicle wheel 10 Sub air chamber member 11 Rim 11a Bead seat 11c Well part 11d Outer peripheral surface 12 Disc 13 Main body part 13a 2nd area | region 13b 1st area | region 13c Connection area | region 13d Bottom area | region 14a Edge part 14b Edge part 15 Recessed part 16a 1st Vertical wall surface 16b Second vertical wall surface 17a Groove portion 17b Groove portion 18a Communication hole 25a Upper plate 25b Bottom plate 25c Side plate 25d Side plate 30 Bead 33a Upper joint portion 33b Upper joint portion 34a Lower joint portion 34b Lower joint portion 37a Center axis 37b Axis 39b Die cutting direction X Wheel circumferential direction Y Wheel width direction Z Wheel radial direction SC Secondary air chamber MC Tire air chamber S1 Rising part S2 Rising part

Claims (3)

The auxiliary air chamber member as a Helmholtz resonator is a vehicle wheel attached on the outer peripheral surface of the well portion,
The sub air chamber member includes a main body having a bottom plate disposed on the outer peripheral surface side of the well portion and an upper plate forming a sub air chamber between the bottom plate,
In the main body portion, in a cross-sectional view along the wheel width direction, a second region so as to be aligned in the wheel width direction, and a first region having a lower height on the outer peripheral surface of the well portion than the second region, , Is defined,
The main body includes a plurality of coupling portions that are recessed from one or both of the upper plate and the bottom plate into the sub-air chamber and partially couple the upper plate and the bottom plate. It is provided along the wheel circumferential direction in the area,
The connecting portion is for a vehicle characterized in that a central axis of the connecting portion is inclined in a direction toward the first region on the outer peripheral surface of the well portion in a cross-sectional view along the wheel width direction. wheel. The vehicle wheel according to claim 1,
A plurality of the coupling portions are provided along the wheel circumferential direction in the first region,
The vehicle wheel according to claim 1, wherein a central axis of the coupling portion in the first region is set to have the same inclination as the central axis of the coupling portion in the second region. The vehicle wheel according to claim 2,
The auxiliary air chamber member is a resin molded body using a mold,
The vehicle wheel according to claim 1, wherein an extending direction of the central axis of the coupling portion is set to coincide with a die cutting direction of the resin molded body.

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