JP4523959B2 - Vehicle wheel - Google Patents

Description

  The present invention relates to a vehicle wheel that reduces noise associated with air column resonance (cavity resonance) in a tire air chamber.

  In general, it is known that air column resonance generated in a tire air chamber (hereinafter referred to as “tire air chamber”) causes road noise of an automobile. Air column resonance is a phenomenon in which random vibration transmitted from the road surface to the tire vibrates the air in the tire air chamber, and as a result, a resonance phenomenon occurs near the air column resonance frequency of the tire air chamber and a resonance sound is generated. .

Conventionally, a vehicle wheel described in Patent Document 1 is known in order to reduce noise associated with this air column resonance. The vehicle wheel has a plurality of auxiliary air chambers along the circumferential direction of the rim. More specifically, this vehicle wheel is formed between an annular vertical wall standing on the well portion so as to extend in the circumferential direction of the rim and a rising side wall of the well portion facing the bead seat portion side. The annular space is closed with a lid member. Each sub-air chamber is formed by partitioning the space portion, which is partitioned by the lid member, the well portion, and the vertical wall, with a plurality of partition walls arranged at predetermined intervals in the circumferential direction. Yes. Further, the tire air chamber and each sub air chamber communicate with each other through a communication hole formed in the lid member. According to this vehicle wheel, the communication hole and the auxiliary air chamber constitute a Helmholtz resonator, and air column resonance noise in the tire air chamber can be reduced.
Japanese Patent Laid-Open No. 2004-90669

However, the conventional vehicle wheel is not a realistic structure. That is, it is necessary to join a plurality of partition walls and lid members to a wheel formed with a vertical wall so as to stand up from the well portion with high accuracy by welding, bonding, fitting and fastening while maintaining airtightness. In consideration of ensuring the manufacturing cost and the increase in manufacturing man-hours and manufacturing costs, there is a problem that it is not suitable for mass production.
In addition, metals, resins, and the like can be used as materials for the members constituting the sub-air chamber. However, in consideration of weight reduction, improvement in mass productivity, ensuring airtightness of the sub-air chamber, etc., a lightweight, blow-moldable resin Is desirable.
However, when resin is used as the material, since the surface rigidity of the wall material that constitutes the secondary air chamber is lower than when using metal, the positive and negative sides fluctuate alternately in the tire air chamber due to air column resonance. When the air pressure fluctuation occurs, the volume of the auxiliary air chamber slightly increases and decreases, and the sound deadening performance as the Helmholtz resonator may not be sufficiently obtained.
In this case, it is conceivable to increase the thickness of the wall material to increase the rigidity. However, increasing the wall material thickness increases the weight of the auxiliary air chamber member, and the centrifugal force acting on the auxiliary air chamber member also increases. Therefore, the member for fixing the auxiliary air chamber member to the well portion also needs strength, and as a result, the vehicle wheel becomes heavier.

  Therefore, in view of such circumstances, the present invention provides a resin-made sub-air chamber member that can improve the mass productivity and reduce the increase in weight as much as possible while increasing the surface rigidity of the wall material constituting the sub-air chamber. It is an object of the present invention to provide a mounted vehicle wheel.

In order to solve the above-mentioned problem, the invention according to claim 1 is a vehicle wheel in which a sub air chamber member is fixed on an outer peripheral surface of a well portion in a tire air chamber, and the radial direction extends from the outer peripheral surface of the well portion. A first vertical wall surface formed so as to rise outward and extend in the circumferential direction of the outer peripheral surface; and a second vertical wall surface formed in the well portion so as to face the first vertical wall surface,
The auxiliary air chamber member is made of resin, and includes a bottom plate on the outer peripheral surface side of the well portion, an upper plate that forms the auxiliary air chamber between the bottom plate, and a communication hole that communicates the auxiliary air chamber and the tire air chamber. Are coupled to the first vertical wall surface and the second vertical wall surface to each of the first vertical wall surface and the second vertical wall surface. And the upper plate is continuously curved so that the cross section in the wheel width direction is convex in a direction away from the outer peripheral surface side of the well portion. It is characterized by that.

According to the first aspect of the present invention, as in a conventional vehicle wheel (see, for example, Patent Document 1), a plurality of partition walls and a lid member are sequentially assembled to the wheel, and these are highly accurately considered while considering airtightness. Unlike the case where the sub air chamber is formed by combining them, the sub air chamber member having the sub air chamber is previously fitted between the first vertical wall surface and the second vertical wall surface provided in the well portion. Manufactured by.
In addition, the upper plate of the upper plate and the bottom plate constituting the main body portion of the auxiliary air chamber is continuously protruded in a direction away from the outer peripheral surface side of the well portion in the cross section in the wheel width direction. Since it is curved, that is, continuously curved in a convex shape outward from the auxiliary air chamber, even when the internal pressure in the auxiliary air chamber increases, expansion of the upper plate to the outside is suppressed, The volume variation of the air chamber is suppressed.

The invention according to claim 2 is a vehicle wheel in which the auxiliary air chamber member is fixed on the outer peripheral surface of the well portion in the tire air chamber, and rises radially outward from the outer peripheral surface of the well portion. A first vertical wall surface formed so as to extend in the circumferential direction, and a second vertical wall surface formed in the well portion so as to face the first vertical wall surface,
The auxiliary air chamber member is made of resin, and includes a bottom plate on the outer peripheral surface side of the well portion, an upper plate that forms the auxiliary air chamber between the bottom plate, and a communication hole that communicates the auxiliary air chamber and the tire air chamber. Are coupled to the first vertical wall surface and the second vertical wall surface to each of the first vertical wall surface and the second vertical wall surface. An edge portion to be engaged with the formed groove portion, and the auxiliary air chamber is partially recessed from one or both of the upper plate and the bottom plate toward the inner side of the auxiliary air chamber. A coupling portion that is coupled to each other is formed.

According to the second aspect of the present invention, the top plate and the bottom plate are partially recessed from one or both of the top plate and the bottom plate of the wall material constituting the main body portion of the sub air chamber into the side of the sub air chamber. Since the connecting portion is formed, the distance between the top plate and the bottom plate is fixed at the connecting portion, and the connecting portion is firmly connected. As a result, the indentation and expansion of the wall material to the inside and outside of the auxiliary air chamber are suppressed, and the volume fluctuation of the auxiliary air chamber is suppressed.

According to the vehicle wheel of the present invention, since the auxiliary air chamber member having the auxiliary air chamber is manufactured by simply fitting between the first vertical wall surface and the second vertical wall surface provided in the well portion, Compared with the conventional vehicle wheel, the manufacturing man-hours and the manufacturing cost can be reduced, and the mass productivity can be improved.
In addition, even when the secondary air chamber is made of resin, it is possible to form a secondary air chamber composed of a thin wall material that can maintain the silencing function with little variation in the volume of the secondary air chamber due to the pressure variation of the tire air chamber. it can. As a result, not only can the main body portion of the auxiliary air chamber member be configured to be lightweight, but also centrifugal force applied to the edge portion for locking the auxiliary air chamber to the well portion is reduced, and the edge portion can also be made thin. The entire auxiliary air chamber member including the edge portion can be reduced in weight, and the entire vehicle wheel including the auxiliary air chamber member can be reduced in weight.

Hereinafter, an embodiment of a vehicle wheel according to the present invention will be described in detail with reference to the drawings.
The vehicle wheel according to the present embodiment is mainly characterized in that a sub air chamber member (Helmholtz resonator) is fitted and fixed to the well portion side.
Here, after first describing the overall configuration of the vehicle wheel, the configuration of the auxiliary air chamber member will be described.

<< Overall configuration of vehicle wheel >>
First, the overall configuration of the vehicle wheel will be described with reference to FIGS. 1 to 3 (refer to FIG. 7 as appropriate).
FIG. 1 is a perspective view of a vehicle wheel according to the present embodiment. FIG. 2 is a front sectional view of a main part of a wheel in which a tire is mounted on the vehicle wheel of FIG. FIG. 3 is a side cross-sectional view of the vehicle wheel, and is a view showing an arrangement position of the auxiliary air chamber member.
As shown in FIG. 1, the vehicle wheel 10 forms a rim 11 for attaching a tire 20 (see FIG. 2), a disk 12 for connecting the rim 11 to a hub (not shown), and the rim 11. The auxiliary air chamber member 13 is fixed on the outer peripheral surface 11d (see FIG. 7A) of the well portion 11c.

  As shown in FIG. 2, the rim 11 is bent in an L shape toward the outer side in the wheel radial direction from the bead sheet portions 11a and 11a formed at both ends in the wheel width direction. Rim flange portions 11b and 11b, and well portions 11c that are recessed inward in the wheel radial direction between bead seat portions 11a and 11a.

The bead portion 21a of the tire 20 is attached to the bead seat portion 11a. As a result, a tire air chamber MC comprising an annular sealed space is formed between the outer peripheral surface 11d of the rim 11 (see FIG. 7A) and the inner peripheral surface of the tire 20.
In addition, regarding the tire 20, the code | symbol 21 shows a tire main body and the code | symbol 22 shows an inner liner.

  The well portion 11 c is provided for dropping the bead portions 21 a and 21 a of the tire 20 when the rim is assembled to the tire 20. A vertical wall 14 is erected on the outer peripheral surface 11d (see FIG. 7A) of the well portion 11c.

As shown in FIG. 2, the disk 12 is formed continuously from the end of the rim 11 on the vehicle outer side to the inner side in the wheel radial direction. The rim 11 and the disk 12 are manufactured from, for example, a lightweight high-strength material such as an aluminum alloy or a magnesium alloy.
These materials are not limited, and may be formed from steel (steel) or the like. The vehicle wheel 10 may be a spoke wheel.

As shown in FIG. 3, four auxiliary air chamber members 13 are arranged along the wheel circumferential direction of the well portion 11c. The auxiliary air chamber members 13 are members that are long in the circumferential direction of the wheel, and each has an auxiliary air chamber SC therein. And the four sub air chamber members 13 in this embodiment are arrange | positioned at equal intervals along the surrounding surface of the well part 11c. That is, the vehicle wheel 10 according to the present embodiment includes two sets of a pair of sub air chamber members 13 that face each other with the rotation center axis of the vehicle wheel 10 interposed therebetween.
1 to 3, the sub air chamber member 13 is simply indicated. However, as will be described later, in addition to the sub air chamber member 13A, which is an example of the sub air chamber member in the present embodiment, a modified example thereof. The auxiliary air chamber member 13B (see FIGS. 9A and 9B), the auxiliary air chamber member 13B ′ (see FIGS. 9C and 9D), and the auxiliary air chamber member 13C (see FIG. 10). ), The auxiliary air chamber member 13D (see FIG. 11A), the auxiliary air chamber member 13E (see FIG. 11B), and the like are represented as the auxiliary air chamber member 13.

《Sub-air chamber member》
Next, the auxiliary air chamber member 13 will be described with reference to FIGS. 4 to 7 (refer to FIG. 2 as appropriate).
FIG. 4 is a perspective view of the auxiliary air chamber member in the present embodiment, and FIG. 5 is a developed plan view of the auxiliary air chamber member curved in the wheel circumferential direction as seen from the direction D in FIG. is there. 6A is a partial cross-sectional view along AA ′ in FIG. 4 (A side), FIG. 6B is a cross-sectional view along CC in FIG. 4, and FIG. 6C is a sub-air chamber member. It is the fragmentary top view which looked at the protrusion part of FIG. 4 from the D direction of FIG. FIG. 7A is a front sectional view of a main part in which a well part to which a sub air chamber member is attached is partially enlarged, and FIG. 7B is a perspective view of a notch part formed in a vertical wall of the well part. is there.

As shown in FIGS. 4 and 6A, the auxiliary air chamber member 13A as an example in the present embodiment is curved in the longitudinal direction thereof along the outer peripheral surface 11d of the well portion 11c.
In the auxiliary air chamber member 13A, an auxiliary air chamber SC (see FIG. 6A) is formed inside the bottom plate 25a (see FIG. 6A) and the upper plate 25b (see FIG. 6A). And a plate-like edge 13e (see FIG. 4) extending from the main body 13a to the periphery thereof. The edge 13e is provided both in the wheel circumferential direction of the main body 13a and in the wheel width direction of the main body 13a.

Here, as shown in FIG. 5, among the edge portions 13e provided on the main body portion 13a, those on the side extending in the circumferential direction of the wheel and provided with the protrusions 18 to be described later are referred to as edge portions 13e ₁ hereinafter. The one opposite to the wheel width direction is referred to as an edge portion 13e ₂ and the one extending in the wheel width direction is referred to as 13e ₃ . When it is not necessary to specify a part, it is simply referred to as edge 13e.
The thickness t1 of the edge 13e (see FIGS. 6A and 6B) is the same as the thickness t2 of the bottom plate 25a and the upper plate 25b of the main body 13a. Further, both ends in the wheel width direction of the edge portions 13e ₁ and 13e ₂ are edge portions 13c and 13c having a circular cross section extending in the wheel circumferential direction and having an outer diameter larger than the wall thickness t1.
Incidentally, the edge 13e of the present embodiment (the edge _{13e 1,} 13e 2, 13e ₃₎ has a spring elasticity by appropriately determining the thickness t1 and later to the material.

Also, from the wheel circumferential direction of the edge portion 13e ₂ near the side of the wheel circumferential end edge 13e ₃ as shown in FIG. 5, Slight wheel radially inward extending in the wheel width direction, that Temporary fastening claws 13f and 13f that are bent so that the surface of the distal end portion is further along the wheel width direction are provided.

  As shown in FIG. 6A, an end 25d, which is an end on the wheel circumferential side, of the upper plate 25b of the main body 13a, which is a wall material surrounding the auxiliary air chamber SC, is inclined at the wheel circumferential end. Is formed. Moreover, as shown in (b) of FIG. 6, among the upper plate 25b of the main body 13a, which is a wall material surrounding the auxiliary air chamber SC, the width end portions 25c and 25c that are the ends in the wheel width direction are the wheel widths. In the cross section in the wheel width direction, the upper plate 25b between the width end portions 25c and 25c is inclined toward the outer side in the wheel radial direction than the bottom plate 25a is convexly curved inward in the wheel radial direction. And is strongly curved. In other words, the upper plate has a shape as described in the claims, wherein the upper plate is curved so as to protrude in a direction away from the outer peripheral surface side of the well portion.

Here, referring to FIG. 7A including a cross-sectional view of the auxiliary air chamber member 13A corresponding to the BB cross section of FIG. 4, the auxiliary air chamber member 13A includes the first vertical wall surface 15 and the second vertical wall member 15A. It fits between the wall surface 16 and is fixed on the outer peripheral surface 11d of the well portion 11c. More specifically, the edge portion 13e ₁ extends to the first vertical wall surface 15 side and fits into the groove portion 17, the edge portion 13e ₂ extends to the second vertical wall surface 16 side and fits into the groove portion 17, As shown to (a) of FIG. 6, it is extended in the wheel circumferential direction so that the outer peripheral surface 11d of the well part 11c may be followed from the main-body part 13a.
Incidentally, as shown in FIG. 7A, the auxiliary air chamber member 13A has edge portions 13e ₁ and 13e extending from the main body portion 13a to the first vertical wall surface 15 side and the second vertical wall surface 16 side, respectively. _{The two} end edges 13 c and 13 c are engaged with the respective groove portions 17 so as to be locked to the first vertical wall surface 15 and the second vertical wall surface 16.

And as shown to (a) of FIG. 7, 13 A of auxiliary | assistant air chamber members are outer periphery of the main-body part 13a so that it may become convex toward the outer peripheral surface 11d side of the well part 11c between both-ends edge 13c, 13c. The bottom plate 25a constituting the surface 11d side and the edge portions 13e ₁ and 13e ₂ extending from the bottom plate 25a are integrally curved.
Incidentally, as will be described later, when the centrifugal force generated by the rotation of the vehicle wheel 10 is applied, the auxiliary air chamber member 13A reverses in a direction in which the curved portion 13d is convex toward the outside in the wheel radial direction. The pressing force of both end edges 13c, 13c against the one vertical wall surface 15 and the second vertical wall surface 16 is increased.

(First vertical wall surface and second vertical wall surface)
As shown in FIG. 7A, the vertical wall 14 is erected on the outer peripheral surface 11d so as to form a first vertical wall surface 15 that rises outward from the outer peripheral surface 11d of the well portion 11c in the wheel radial direction. . The vertical wall 14 has an annular shape extending in the wheel circumferential direction of the outer peripheral surface 11d. Further, a second vertical wall surface 16 is provided so as to face the first vertical wall surface 15 on the side surface portion 11e formed on the wheel width direction inner side (vehicle inner side) of the well portion 11c.
Note that the vertical wall 14 in the present embodiment is formed integrally with the well portion 11c when the rim 11 is cast.

A groove portion 17 is formed in each of the first vertical wall surface 15 and the second vertical wall surface 16. These groove parts 17 and 17 are formed along the wheel circumferential direction of the outer peripheral surface 11d of the well part 11c to form an annular groove. The edge portions 13e of the auxiliary air chamber member 13A are fitted into these groove portions 17 and 17.
Incidentally, the groove parts 17 and 17 are formed by machining each of the vertical wall 14 and the side surface part 11e.

Further, as shown in FIGS. 7A and 7B, the vertical wall 14 is formed with a notch portion 14a. The protruding portion 18 (pipe member P) of the auxiliary air chamber member 13A is fitted into the notch portion 14a. The detailed configuration of the protrusion 18 will be described later.
The notch portion 14a is formed simultaneously with the vertical wall 14 when the rim 11 is cast, or is formed by machining the vertical wall 14.

  As described above, as shown in FIG. 7A, the sub air chamber SC of the sub air chamber member 13A is surrounded by the main body portion 13a. The main body portion 13a includes the bottom plate 25a and the upper plate 25b (wheel width). It includes width end portions 25c, 25c on the direction side (see FIG. 6B) and peripheral end portions 25d, 25d on the wheel circumferential direction side (see FIG. 6A).

(Protruding part)
Returning to FIG. 4 again, the protrusion 18 will be described.
As shown in FIGS. 4 and 5, the auxiliary air chamber member 13 </ b> A has a protruding portion 18 that protrudes from the main body portion 13 a in a direction Y that intersects the rotational direction X of the vehicle wheel 10 (a direction orthogonal to the present embodiment). I have.
Incidentally, as shown in FIG. 5, between the projecting portion 18 and the edge 13e ₁ is a gap G is formed.

As shown in FIG. 6C, the protruding portion 18 extends to the vertical wall 14 side and is fitted into a notch portion 14 a formed in the vertical wall 14.
Incidentally, the gaps G and G facilitate fitting when the protruding portion 18 is fitted into the notch portion 14a. Also, to facilitate bending when the edge 13e ₁ is bent by the centrifugal force, the root portion 18a followed and it protruded portion 18, the edge portion 13e _1, in order to keep out fatigue cracks between.
As shown in FIG. 7B, the protruding portion 18 is formed of a pipe member P. Inside the pipe member P, a sub air chamber SC and a tire air chamber MC (see FIG. 2) are formed. A communication hole 13b to be connected is formed.

The shape of the sub air chamber SC formed in such a sub air chamber member 13A is not particularly limited, but a flat convex shape in a cross-sectional view is preferable, and the sub air chamber SC in this embodiment is shown in FIG. As shown in FIG. 6B, the well portion 11c (see FIG. 6A) has a thin convex shape in the wheel radial direction.
Incidentally, as shown in FIG. 2, the auxiliary air chamber member 13A has a maximum diameter D1 from the wheel central axis to the wheel radial direction outer end of the auxiliary air chamber member 13A, and a diameter D2 from the wheel central axis to the bead seat portion 11a. Is set smaller than. As a result, there is no problem when the tire 20 is mounted.

  As a material of the sub air chamber member 13A, it is preferable to use a synthetic resin. Further, considering the weight reduction of the auxiliary air chamber member 13A, the improvement of mass productivity, the reduction of the manufacturing cost, the securing of the airtightness of the auxiliary air chamber SC, etc., a lightweight and highly rigid blow moldable material is preferable. Polypropylene that is resistant to repeated bending fatigue is preferred.

  The volume of the sub air chamber SC in the sub air chamber member 13A is preferably about 50 to 250 cc. By setting the volume of the auxiliary air chamber SC within this range, the auxiliary air chamber member 13A can sufficiently reduce the weight of the vehicle wheel 10 while suppressing the increase in weight while sufficiently exhibiting the silencing effect. Can do. Further, the length of the auxiliary air chamber member 13A in the circumferential direction of the wheel is about half the circumferential length of the rim 11, and the adjustment of the weight of the vehicle wheel 10 and the ease of assembly to the well portion 11c are taken into consideration. And can be set appropriately.

(Communication hole length)
The cross-sectional shape of the communication hole 13b (see FIG. 7B) is not particularly limited and is circular in the present embodiment, but may be any of an elliptical shape, a polygonal shape, a tunnel shape, and the like. The diameter of the communication hole 13b is preferably 5 mm or more when the cross section is circular. Further, the communication hole 13b having a cross-sectional shape other than a circle preferably has a diameter of 5 mm or more in terms of the cross-sectional area converted to a circle having the same cross-sectional area.

  The length of the communication hole 13b is set so as to satisfy the formula for obtaining the resonance frequency of the Helmholtz resonator represented by the following formula (1).

f0 = C / 2π × √ (S / V (L + α × √S)) (1)
f0 (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 auxiliary air chamber SC L (m): Length of the communication hole 13b S (m ² ): Cross-sectional area of the opening of the communication hole 13b α: Correction coefficient The resonance frequency f0 is the tire The resonance frequency of the air chamber MC is adjusted. At this time, the resonance frequencies f0 of the four auxiliary air chamber members 13A shown in FIG. 3 may all be set the same or may be different. Specifically, when two resonance frequencies (f1, f2) are recognized as the resonance frequencies of the tire air chamber MC, the resonance frequencies f0 of the four auxiliary air chamber members 13A may be set to (f1 + f2) / 2. it can. Further, the resonance frequency f0 of the pair of auxiliary air chamber members 13A and 13A that are substantially opposed to each other across the wheel center axis is set to f1, and the resonance frequency f0 of the other pair of auxiliary air chamber members 13A and 13A is set to f2. It can also be set.

Next, the effect of the vehicle wheel 10 according to the present embodiment will be described with reference to FIG. 8 (refer to FIGS. 2 and 4 to 6 as appropriate).
FIG. 8A is a conceptual diagram showing the behavior of the sub air chamber member to which the centrifugal force is applied, and is a cross-sectional view taken along the line BB in FIG. 4, and FIG. 8B is an increase in the internal pressure in the sub air chamber. It is a deformation | transformation comparison figure of the main-body part of the sub air chamber in embodiment, and the sub air chamber of a comparative example at the time of doing.

  The vehicle wheel 10 according to the present embodiment is a high-performance vehicle wheel that takes into account airtightness by sequentially assembling a plurality of partition walls and lid members on a rim, as in a conventional vehicle wheel (see, for example, JP-A-2004-90669). Unlike the case where the sub air chamber is formed by combining these with high accuracy, the sub air chamber member 13A having the sub air chamber SC is manufactured by simply fitting the rim 11 (well portion 11c). Therefore, the vehicle wheel 10 can reduce the number of manufacturing steps and the manufacturing cost and improve the mass productivity as compared with the conventional vehicle wheel such as Japanese Patent Application Laid-Open No. 2004-90669 described above. . In addition, unlike the conventional vehicle wheel, the vehicle wheel 10 does not require special consideration for ensuring the airtightness of the auxiliary air chamber SC, so that the quality of the silencing performance can be stabilized.

  Further, the vehicle wheel 10 according to the present embodiment can reduce the number of defective products because the resonance frequency can be confirmed and corrected by the auxiliary air chamber member 13A alone before the auxiliary air chamber member 13A is fitted into the rim 11.

Further, when the vehicle wheel 10 fixes the auxiliary air chamber member 13A to the rim 11 (well portion 11c), as shown in FIG. 7A, the protruding portion 18 (FIG. 7) of the auxiliary air chamber member 13A. fit the (b) refer) to notch 14a, fitting the edges 13e ₁ side edge 13c in the groove 17 of the first vertical wall surface 15, further the tip of the temporary fixing claw 13f (see FIG. 5) first 2 is fitted into the groove portion 17 of the vertical wall surface 16 to complete the temporary fixing, and the edge portion 13e ₂ is inward in the wheel radial direction with a mechanical force using a pressing jig having a curved surface along the outer peripheral surface 11d. pushing the side edge 13e ₂ side edge 13c dropped into the groove 17 of the second vertical wall surface 16.
By this pushing, not only the edge 13e ₂ but also the edge 13e ₁ is changed from the temporarily fitted state to the completely fitted state.
At this time, since the edge portions 13e ₁ and 13e ₂ have spring elasticity, the auxiliary air chamber member 13A is easily and firmly fixed between the first vertical wall surface 15 and the second vertical wall surface 16. Is done.

Further, in the vehicle wheel 10, as shown in FIG. 7B, the protruding portion 18 of the auxiliary air chamber member 13 </ b> A protruding in the direction Y intersecting with the rotation direction X of the wheel is notched in the vertical wall 14. Since it is fitted in the portion 14a, the auxiliary air chamber member 13A is reliably prevented from rotating when the vehicle wheel rotates.
And since the communication hole 13b is formed inside the protrusion part 18, it is not necessary to provide the member for forming the communication hole 13b separately from the protrusion part 18, and the vehicle wheel 10 has the structure. Can be simplified to further reduce the weight.

  In the vehicle wheel 10, when the centrifugal force due to the rotation acts on the auxiliary air chamber member 13 </ b> A, the curved portion 13 d is convex toward the outer peripheral surface 11 d of the rim 11. It tries to reverse in a direction that is convex outward in the radial direction.

  As shown in FIG. 8A, the curved portion 13d is convex in the direction opposite to the direction of centrifugal force F1 (centrifugal direction), in other words, convex toward the outer peripheral surface 11d shown in FIG. When the centrifugal force F1 acts on the auxiliary air chamber member 13A having the curved portion 13d, the auxiliary air chamber member 13A in which the movement of the both end edges 13c and 13c in the centrifugal direction is restricted by the groove portion 17 has the curved portion 13d. On the contrary, the curved portion 13d extends in an attempt to reverse in a direction that protrudes outward in the wheel radial direction. As a result, the distance between both end edges 13c and 13c in the sub air chamber member 13A indicated by the dotted line where the centrifugal force F1 is applied is larger than the span W1 between the both end edges 13c and 13c in the sub air chamber member 13A before the centrifugal force F1 is applied. The span W2 becomes longer.

  Then, both end edges 13c and 13c of the well portion 11c (see FIG. 7A) that are controlled to move outward in the wheel width direction by the vertical wall 14 and the side surface portion 11e are 14 and the pressing force on the side surface portion 11e are increased. That is, this vehicle wheel 10 increases the pressing force of both end edges 13c, 13c against the first vertical wall surface 15 and the second vertical wall surface 16 shown in FIG. Is more reliably fixed to the well portion 11c side.

When the internal pressure of the sub air chamber SC increases as shown in FIG. 8B, the sub air chamber member 113 of the comparative example in which the upper plate indicated by the dotted line is flat in the wheel width direction has a main body portion. While the upper plate of 113a expands outward in the wheel radial direction as indicated by a phantom line indicated by a two-dot chain line, in the auxiliary air chamber member 13A of this embodiment, the upper plate 25b is almost outward in the wheel radial direction. Does not swell. As a result, even if the air pressure in the tire air chamber MC (see FIG. 2) fluctuates, the volume of the auxiliary air chamber SC hardly fluctuates, and the air column resonance sound can be effectively reduced as a Helmholtz resonator. Can do. As a result, even if the air pressure in the tire air chamber MC (see FIG. 2) varies while the thickness of the upper plate 25b forming the sub air chamber SC is reduced, the variation in the volume of the sub air chamber SC is the comparative example. The auxiliary air chamber member 113 can be made smaller, and the air column resonance can be effectively reduced as a Helmholtz resonator.
As a result, the main body portion 13a of the auxiliary air chamber member 13A can be reduced in weight, so that the thickness of the edge portion 13e that supports the auxiliary air chamber member 13A against the centrifugal force can be reduced accordingly, and the weight of the auxiliary air chamber member 13A as a whole. Can be reduced in weight. Therefore, the vehicle wheel 10 to which the auxiliary air chamber member 13A is attached can also be reduced in weight.

Moreover, in this vehicle wheel 10, as shown in FIG. 2, the maximum diameter D1 from the wheel central axis to the outermost wheel radial direction of the auxiliary air chamber member 13A is the diameter from the wheel central axis to the bead seat portion 11a. Since it is set to be smaller than D2, when the rim of the tire 20 is assembled, the possibility that a tool such as a lever or the tire 20 (bead portion 21a, etc.) contacts the auxiliary air chamber member 13A is reduced. As a result, the assembly performance of the tire 20 is improved.
In the vehicle wheel 10, the cross-sectional shape in the wheel width direction of the bottom plate 25 a and the upper plate 25 b of the main body 13 a that forms the sub air chamber SC is a flat convex shape outward from the sub air chamber. Therefore, a predetermined volume of the sub air chamber SC can be ensured while reducing the maximum diameter D1 from the wheel center axis to the outermost wheel radial direction of the sub air chamber member 13A.

《Variation of secondary air chamber》
As mentioned above, although this embodiment was described, this invention is not limited to the said embodiment, It can implement with a various form.
Note that, in the vehicle wheel in the modified example described below, the same components as those in the above-described embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the embodiment described above, the wheel widths of the bottom plates 25a and 25b, which are wall members of the main body 13a forming the sub air chamber SC, are used as the sub air chamber having a small volume variation of the sub air chamber SC with respect to the air pressure variation of the tire air chamber MC. The cross-sectional shape of the bottom plate 25a is a convex curve to the shallow outer side (inward side in the wheel radial direction), and the upper plate 25b is curved to the outer side (outer side in the wheel radial direction) stronger than the bottom plate 25a. However, it is not limited to this.

(Sub-air chamber of the first modification)
(A), (b) of Drawing 9 is a figure showing the sub air chamber member of the 1st modification, and (a) is a development top view which looked at the sub air chamber member from the wheel diameter direction inside. (B) is the EE arrow sectional drawing in (a).
The auxiliary air chamber member 13B according to the first modified example has, for example, four vertical beads 31 that are recessed toward the auxiliary air chamber SC and extend in the circumferential direction of the wheel on the bottom plate 25a of the auxiliary air chamber member 13A. For example, 15 horizontal beads 32 that are recessed toward the air chamber SC and extend in the wheel width direction are formed.
In this manner, when the internal pressure of the auxiliary air chamber SC is increased by providing the vertical beads 31 and the horizontal beads 32 on the curved bottom plate 25a having a shallow convex shape in the wheel radial cross section, the auxiliary air chamber member 13B has almost no bottom plate 25a. Expansion to the inner side in the wheel radial direction is further suppressed.
In particular, when the pressure in the auxiliary air chamber SC increases, the bottom plate 25a having a small degree of outward bending is more likely to bend outward, but by providing the beads 31 and 32 vertically and horizontally in this way. And the bending at the time of the internal pressure rise of the baseplate 25a can be suppressed rather than the case of the sub air chamber member 13A.
As a result, even if the air pressure in the tire air chamber MC (see FIG. 2) varies while the thickness of the bottom plate 25a and the upper plate 25b forming the sub air chamber SC is thin, the volume of the sub air chamber SC varies. The auxiliary air chamber member 13A can be made smaller, and the air column resonance can be effectively reduced as a Helmholtz resonator.
As a result, the main body portion 13a of the auxiliary air chamber member 13B can be reduced in weight, so that the thickness of the edge portion 13e that supports the auxiliary air chamber member 13B against the centrifugal force can be reduced accordingly, and the weight of the auxiliary air chamber member 13B as a whole. Can be reduced in weight. Therefore, the vehicle wheel 10 to which the auxiliary air chamber member 13B is attached can also be reduced in weight.

(Sub-air chamber of the second modification)
(C), (d) of Drawing 9 is a figure showing the sub air chamber member of the 2nd modification, and (c) is a development top view which looked at the sub air chamber member from the wheel diameter direction outside. (D) is FF arrow sectional drawing in (c).
The auxiliary air chamber member 13B ′ of the second modified example is formed with a plurality of vertical beads 31 that are recessed toward the auxiliary air chamber SC and extend in the circumferential direction of the wheel on both the bottom plate 25a and the upper plate 25b of the auxiliary air chamber member 13A. In addition, a plurality of horizontal beads 32 that are recessed toward the auxiliary air chamber SC and extend in the wheel width direction are formed.
Thus, by providing the vertical beads 31 and the horizontal beads 32 on both the shallow convex curved bottom plate 25a and the strong convex curved top plate 25b in the wheel radial cross section, the internal pressure of the auxiliary air chamber SC increases. In this case, the expansion of the upper plate 25b to the outer side in the wheel radial direction is further suppressed as compared with the auxiliary air chamber member 13B of the first modification. As a result, even if the air pressure in the tire air chamber MC (see FIG. 2) varies while the thickness of the bottom plate 25a and the upper plate 25b forming the sub air chamber SC is thin, the volume of the sub air chamber SC varies. The auxiliary air chamber member 13B can be made smaller, and the air column resonance can be effectively reduced as a Helmholtz resonator.
As a result, the main body portion 13a of the auxiliary air chamber member 13B ′ can be reduced in weight, so that the thickness of the edge portion 13e that supports the auxiliary air chamber member 13B ′ against the centrifugal force can be reduced accordingly, and the auxiliary air chamber member 13B ′. The overall weight can be reduced. Therefore, the vehicle wheel 10 to which the auxiliary air chamber member 13B ′ is attached can also be reduced in weight.

(Sub-air chamber of the third modification)
FIG. 10 is a view showing a sub air chamber member of a third modified example, (a) is a developed plan view of the sub air chamber member as seen from the outside in the wheel radial direction, and (b) is a sub air chamber member. Is a developed plan view as seen from the inside in the wheel radial direction, and (c) is a cross-sectional view taken along line XX in (b).
The sub air chamber member 13C of the third modification is formed with a plurality of vertical beads 31 that are recessed toward the sub air chamber SC and extend in the circumferential direction of the wheel on the bottom plate 25a of the sub air chamber member 13A. A plurality of horizontal beads 32 extending in the wheel width direction are formed, and a deep recess is formed locally from the bottom plate 25a side to the upper plate 25b. The bottom plate 25a and the upper plate are formed at the bottom of the depression. 25b are joined to form upper surface abutting portions (joining portions) 33A at a plurality of locations. In the sub air chamber member 13C of the present modification, eleven upper surface abutting portions 33A are provided at equal intervals in the center in the wheel width direction, extending in one row in the wheel circumferential direction.

In this way, the vertical bead 31 and the horizontal bead 32 are provided on the shallow convex curved bottom plate 25a in the wheel radial direction cross section, and further, a deep recess is locally formed from the bottom plate 25a side to the upper plate 25b. Since the bottom plate 25a and the upper plate 25b are joined at the upper surface abutting portion (joint portion) 33A at the bottom of the recess, the separation distance between the bottom plate 25a and the upper plate 25b forming the sub air chamber SC is firmly fixed. When the internal pressure of the auxiliary air chamber SC increases, the expansion of the bottom plate 25a and the upper plate 25b to the outside of the auxiliary air chamber SC is further suppressed as compared with the auxiliary air chamber member 13B of the first modification. . As a result, even if the air pressure in the tire air chamber MC (see FIG. 2) varies, the variation in the volume of the auxiliary air chamber SC can be made smaller than that of the auxiliary air chamber member 13B, effectively serving as a Helmholtz resonator. Air column resonance can be reduced.
As a result, the main body portion 13a of the auxiliary air chamber member 13C can be reduced in weight, so that the thickness of the edge portion 13e that supports the auxiliary air chamber member 13C against the centrifugal force can be reduced accordingly, and the weight of the auxiliary air chamber member 13C as a whole. Can be reduced in weight. Therefore, the vehicle wheel 10 to which the auxiliary air chamber member 13C is attached can also be reduced in weight.

(Sub-air chamber members of the fourth and fifth modifications)
The method of locally joining the bottom plate 25a and the top plate 25b as in the auxiliary air chamber member 13C of the third modified example is not limited to that shown in FIG. 10, but is modified as follows. Also good.
11A is a cross-sectional view corresponding to the cross-sectional view taken along the line XX in FIG. 10B of the fourth auxiliary air chamber member. As shown in FIG. 11 (a), deep depressions are locally formed from both sides of the bottom plate 25a and the upper plate 25b, and the bottom plate 25a and the upper plate 25b are joined to each other at the bottom of both depressions. You may comprise the abutting part (joining part) 33B in multiple places. In the auxiliary air chamber member 13D of the present modification, eleven upper and lower abutting portions 33B are provided at equal intervals in the center in the wheel width direction, extending in one row in the wheel circumferential direction.
FIG. 11B is a cross-sectional view corresponding to the cross-sectional view taken along the line XX in FIG. 10B of the fourth sub air chamber member. As shown in FIG. 11 (b), a deep recess is locally formed from the upper plate 25b side toward the bottom plate 25a, and the bottom plate 25a and the upper plate 25b are joined to each other at the bottom of the recess, so that the bottom surface abuts. The portion (coupling portion) 33C may be configured at a plurality of locations. In the auxiliary air chamber member 13D of the present modification, eleven upper and lower abutting portions 33B are provided at equal intervals in the center in the wheel width direction, extending in one row in the wheel circumferential direction.
The effects of the sub air chamber member 13D of the fourth modification and the sub air chamber member 13E of the fifth modification are substantially the same as those of the sub air chamber member 13C of the third modification.

In the auxiliary air chamber members 13C, 13D, and 13E, the upper surface abutting portion 33A, the upper and lower abutting portions 33B, and the lower surface abutting portion 13C extend in a row in the circumferential direction of the wheel at equal intervals in the center in the wheel width direction. Although a plurality of locations are provided, the present invention is not limited thereto, and the upper surface abutting portion 33A, the upper and lower abutting portions 33B, or the lower surface abutting portion 33C may be extended in the wheel circumferential direction to form a plurality of rows in the wheel width direction. good.
At this time, the upper surface abutting portion 33A, the upper and lower abutting portion 33B, or the lower surface abutting portion 33C may be arranged in a staggered manner between adjacent rows in the wheel width direction.

<< Variation of vehicle wheel >>
In the embodiment, the second vertical wall surface 16 is provided on the side surface portion 11e of the well portion 11c. However, the vehicle wheel according to the first modification has the second vertical wall surface 16 at the other rising portion of the well portion 11c. Is formed. FIG. 12 is a cross-sectional view of a rim used in the vehicle wheel according to the first modification.

As shown in FIG. 12, the well portion 11c of the rim 11 used in the vehicle wheel 10 has a small diameter portion 23a and a large diameter portion 23b continuous to the small diameter portion 23a via a step portion 11f. Yes.
Incidentally, in the rim 11, a bead sheet portion 11a is formed on the outside of the large diameter portion 23b via the side surface portion 11e of the well portion 11c. That is, in the vehicle wheel of the first modified example, the auxiliary air chamber member 13 in the above-described embodiment (in FIG. 12, the auxiliary air chamber members 13A to 13E are represented as the auxiliary air chamber member 13). The edge portion 13e ₂ is fitted into the step portion 11f on the inner side in the wheel radial direction of the rim 11 with respect to the side surface portion 11e into which the one edge portion 13e ₂ is fitted.

Therefore, in the vehicle wheel 10 according to the first modification, the outer peripheral surface 11d of the well portion 11c that fixes the auxiliary air chamber member 13 is further in the wheel radial direction as compared with the vehicle wheel 10 according to the embodiment. It will be formed inside.
As a result, in the vehicle wheel 10 according to the first modification, the circumferential length of the outer peripheral surface 11d of the well portion 11c is shortened, so that further weight reduction can be achieved. And in this vehicle wheel 10, compared with the vehicle wheel 10 in the above embodiment, the auxiliary air chamber member 13 shifts away from the bead seat portion 11a inward in the wheel radial direction, The assembly performance of the tire 20 is further improved.

(Second and third modifications)
In the vehicle wheel of the embodiment and the first modified example, the four sub air chamber members 13 are arranged at substantially equal intervals along the outer peripheral surface 11d of the well portion 11c. May be 5 or more, or the number of sub air chamber members 13 may be 3 or less.
FIGS. 13A and 13B are side sectional views of the vehicle wheel according to the second and third modified examples, and are diagrams showing modified examples of the arrangement of the sub air chamber members.
In the vehicle wheel 10 according to the second modified example shown in FIG. 13A, the auxiliary air chamber member 13 is disposed so as to face 180 ° along the peripheral surface of the well portion 11 c.
In the vehicle wheel 10 according to the third modified example shown in FIG. 13B, three auxiliary air chamber members 13A are arranged at intervals of 120 ° along the outer peripheral surface 11d of the well portion 11c.

  As described above, the number of the auxiliary air chamber members 13 is not particularly limited in the vehicle wheel 10, but considering the noise reduction efficiency, four or more auxiliary air chamber members 13 are opposed to each other with the wheel central axis interposed therebetween. Arrangement is desirable.

(Modification of communication hole)
Further, in the vehicle wheel of the embodiment and the first to third modifications, the communication hole 13b is formed in the middle of the auxiliary air chamber member 13 in the longitudinal direction. As long as the adverse effect is not adversely affected, there is no particular limitation on the position where the communication hole 13b is formed. FIGS. 14A and 14B are plan views of the sub air chamber member showing positions where the communication holes are formed.

  The auxiliary air chamber member 13 shown in FIG. 14A includes a pipe member having a communication hole 13b on the inside. This pipe member also serves as the above-described detent and is fitted into a notch portion 14a (see FIG. 7B) formed in the vertical wall 14 (see FIG. 7B). And the pipe member P protrudes in the direction Y which cross | intersects the rotation direction X of a wheel by the one end side of the longitudinal direction of the sub air chamber member 13. As shown in FIG.

In the sub air chamber member 13 shown in FIG. 14B, the tube member P having the communication hole 13 b on the inside protrudes toward the wheel rotation direction X on one end side in the longitudinal direction of the sub air chamber member 13. Yes. The auxiliary air chamber member 13 is provided with the protruding portion 18 as the above-described rotation stopper. The protrusion 18 protrudes from the edge 13e _{1 in} the middle of the auxiliary air chamber member 13 in the longitudinal direction toward the direction Y intersecting the rotation direction X of the wheel, and the vertical wall 14 ((b of FIG. ))), And the cutout portion 14a (see FIG. 7B) is formed.

It is a perspective view of the wheel for vehicles concerning this embodiment. It is principal part front sectional drawing of the wheel which attached the tire to the vehicle wheel of FIG. It is side surface sectional drawing of the wheel for vehicles, Comprising: It is a figure which shows the arrangement position of a sub air chamber member. It is a perspective view of the sub air chamber member in this embodiment. FIG. 5 is a developed plan view of the auxiliary air chamber member curved in the wheel circumferential direction as seen from the direction D in FIG. (A) is AA 'partial sectional drawing (A side) in FIG. 4, (b) is CC sectional drawing in FIG. 4, (c) is a protrusion part of a sub air chamber member It is the partial top view which looked at from the D direction of FIG. (A) is principal part front sectional drawing which expanded partially the well part which attached the sub air chamber member, (b) is a perspective view of the notch part formed in the vertical wall of a well part. (A) is a conceptual diagram which shows the behavior of the sub air chamber member which the centrifugal force acted, Comprising: It is BB sectional drawing in FIG. 4, (b) is a case where the internal pressure in a sub air chamber increases. FIG. 6 is a deformation comparison view of the main body portion of the auxiliary air chamber in the embodiment and the auxiliary air chamber of the comparative example. (A), (b) is a figure which shows the sub air chamber member of a 1st modification, (a) is the expansion | deployment top view which looked at the sub air chamber member from the wheel radial inside, (b ) Is a cross-sectional view taken along the line E-E in (a), (c) and (d) are diagrams showing a secondary air chamber member of a second modification, and (c) is a secondary air chamber. It is the expansion | deployment top view which looked at the member from the wheel radial direction outer side, (d) is FF arrow sectional drawing in (c). The It is a figure which shows the sub air chamber member of a 3rd modification, (a) is the expansion | deployment top view which looked at the sub air chamber member from the wheel radial direction outer side, (b) is a wheel radial direction. It is the expansion | deployment top view seen from the inner side, (c) is XX arrow sectional drawing in (b). (A) is sectional drawing corresponding to XX arrow sectional drawing in FIG.10 (b) of the sub air chamber member of a 4th modification, (b) is a subpart of a 5th modification. It is sectional drawing corresponding to the XX arrow sectional drawing in FIG.10 (b) of an air chamber member. It is sectional drawing of the rim | limb used based on the other modification of the wheel for vehicles. (A) And (b) is side sectional drawing of the wheel for vehicles of another modification, Comprising: It is a figure which shows the modification of arrangement | positioning of a sub air chamber member. (A) And (b) is a top view of the sub air chamber member which shows the position which forms a communicating hole.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Vehicle wheel 11 Rim 11a Bead seat part 11c Well part 11d Outer peripheral surface 11e Side surface part 11f Step part 12 Disc 13, 13A, 13B, 13B ', 13C, 13D, 13E Secondary air chamber member 13a Main body part 13b Communication hole 13d Curve part 13c edges _{13e, 13e 1, 13e 2,} 13e 3 edge 14 vertical wall 14a cutout portion 15 first vertical wall surface 16 and the second vertical wall surface 17 groove 18 protrusion 20 tires 33A upper surface abutting portion (coupling portion )
33B Vertical abutment (joint)
33C Bottom surface abutting part (joint part)
MC tire air chamber SC secondary air chamber

Claims (2)

A vehicle wheel in which the auxiliary air chamber member is fixed on the outer peripheral surface of the well portion in the tire air chamber,
A first vertical wall surface formed so as to rise radially outward from the outer peripheral surface of the well portion and extend in the circumferential direction of the outer peripheral surface;
A second vertical wall surface formed in the well portion so as to face the first vertical wall surface;
With
The auxiliary air chamber member is
Formed of resin,
A main body comprising a bottom plate on the outer peripheral surface side of the well portion, an upper plate forming a sub air chamber between the bottom plate, and a communication hole communicating the sub air chamber and the tire air chamber;
The bottom plate and the top plate are coupled to each other, and extended from the main body portion to the first vertical wall surface and the second vertical wall surface, and formed on the first vertical wall surface and the second vertical wall surface, respectively. An edge to be locked in the groove formed,
Have
The vehicle wheel according to claim 1 , wherein the upper plate is continuously curved so that a cross section in the wheel width direction is convex in a direction away from the outer peripheral surface side of the well portion. A vehicle wheel in which the auxiliary air chamber member is fixed on the outer peripheral surface of the well portion in the tire air chamber,
A first vertical wall surface formed so as to rise radially outward from the outer peripheral surface of the well portion and extend in the circumferential direction of the outer peripheral surface;
A second vertical wall surface formed in the well portion so as to face the first vertical wall surface;
With
The auxiliary air chamber member is
Formed of resin,
A main body comprising a bottom plate on the outer peripheral surface side of the well portion, an upper plate forming a sub air chamber between the bottom plate, and a communication hole communicating the sub air chamber and the tire air chamber;
The bottom plate and the upper plate are coupled to each other, and are extended from the main body portion to the first vertical wall surface and the second vertical wall surface, respectively, and are formed on the first vertical wall surface and the second vertical wall surface, respectively. An edge to be locked in the groove,
Have
The sub-air chamber is formed with a coupling portion that is recessed from one or both of the upper plate and the bottom plate toward the inner side of the sub-air chamber and partially couples the upper plate and the bottom plate. A vehicle wheel characterized by the following.

Images