JP2012096755A - Vehicle wheel and rim covering material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle wheel and rim covering material capable of preventing air bubbles from entering the space between a rim outer peripheral surface and a stretchable member and making uniform thickness of an adhesive layer formed between the rim outer peripheral surface and the stretchable member when proving a rim covering material composed of the sheet stretchable member on the rim outer peripheral surface by means of an adhesive.SOLUTION: The vehicle wheel includes a rim covering material (heat-insulation rubber 30) composed of a sheet stretchable member fixed on the rim outer peripheral surface using adhesives. The stretchable member includes a large number of recesses 31 formed on the rim outer peripheral surface and a through-hole (a communication path 34) connecting each of the recesses 31 and a surface opposed to the rim outer peripheral surface.

Description

  The present invention relates to a vehicle wheel and a rim covering material.

  Generally, a well portion for once dropping a bead portion of a tire when the tire is assembled is formed on the outer peripheral surface of the rim of the vehicle wheel. The well portion is formed to be recessed at a position lower than the bead seat portion where the bead portion finally settles, that is, in the center direction of the wheel. Therefore, the rim outer peripheral surface is curved in the wheel circumferential direction and is formed to be recessed in the rim width direction to form a three-dimensional curved surface.

  On the other hand, an elastic member typified by a sheet-like rubber member may be disposed on such an outer surface of the rim via an adhesive. Specifically, for example, a vehicle wheel having a heat insulating rubber filed earlier by the present applicant (Japanese Patent Application No. 2009-206549, unpublished), and an auxiliary air chamber member (Helmholtz resonator) provided on the outer peripheral surface of the rim. This corresponds to a vehicle wheel (Japanese Patent Application No. 2009-206698, unpublished) in which is fixed with a rubber covering member. Incidentally, the vehicle wheel having the heat insulating rubber is configured to prevent the heat generated by the rolling tire from being dissipated through the rim for the purpose of reducing the rolling resistance of the tire. Also, the vehicle wheel provided with a rubber covering member covers the auxiliary air chamber member (Helmholtz resonator) provided on the outer surface of the rim in order to mute road noise caused by air column resonance of the tire. It is the structure covered with a member.

  By the way, if it is going to arrange | position the above-mentioned elastic member along the rim outer peripheral surface which forms a three-dimensional curved surface, the elastic agent cannot follow a three-dimensional curved surface, but the adhesive agent intervenes between this three-dimensional curved surface In some cases, air is entrained to form bubbles. And once the air is entangled between the elastic member and the outer peripheral surface of the rim, the air entrapped near the center, even at the end of the elastic member, can be expanded by using a bladder or a mechanical roller. Even if the upper surface of the substrate is pressurized, it does not come out easily.

  The bubbles not only cause adhesion defects by forming a defective portion of the adhesive, but are also caused by heat generated by rolling of the tire or the like (generally reaching a temperature of 80 ° C. to 90 ° C.). It is exposed and expands, and the elastic member is peeled off from the outer peripheral surface of the rim. And since the centrifugal force of 1000 G or more is applied to the heat insulating rubber or the like in the wheel that is rotating at high speed, it is necessary to prevent slight peeling.

  Furthermore, referring to the adhesion between the stretchable member and the rim outer peripheral surface, as described above, when the followability of the stretchable member to the rim outer peripheral surface is insufficient, the stretchable member and the rim outer peripheral surface There is a possibility that the thickness of the adhesive layer interposed therebetween may be uneven. In addition, even if the upper surface of the stretchable member is pressed along the three-dimensional curved surface using a bladder, the thickness of the adhesive layer is not large in the portion where the curvature change of the three-dimensional curved surface is large. The tendency to become uniform becomes remarkable. If the thickness of the adhesive layer becomes non-uniform, when the adhesive layer is cured, variations in the degree of curing of the adhesive and variations in adhesive strength occur.

On the other hand, in the technical field related to adhesives, conventionally, as a technique for preventing air from being caught in the pressure-sensitive adhesive layer of the pressure-sensitive adhesive sheet, a technique in which a plurality of protrusions are provided on the pressure-sensitive adhesive layer formed on the base sheet is known. (See, for example, Patent Document 1 to Patent Document 4).
This pressure-sensitive adhesive sheet utilizes the space between the protrusions of the pressure-sensitive adhesive layer when the pressure-sensitive adhesive layer is pressed against the adherend to spread the pressure-sensitive adhesive between the adherend and the base sheet. It is configured to release the intervening air.

Japanese Patent No. 4034866 Japanese Patent No. 4334883 JP 2000-186254 A Japanese Utility Model Publication No. 3-67043

By the way, as described above, in order to prevent air bubbles from being caught in the adhesive layer when the elastic member is disposed on the outer peripheral surface of the rim or the like, a technique related to a conventional pressure-sensitive adhesive sheet (for example, Patent Document 1 to Patent). It is conceivable to apply the literature 4). That is, it is conceivable to provide an adhesive layer provided with a large number of protrusions in advance on the adhesive surface side of the elastic member with respect to the rim outer peripheral surface.
However, even if an elastic member having such an adhesive layer is used, the rim outer peripheral surface having a three-dimensional curved surface with a large change in curvature, particularly in a recessed region, air does not escape and between the heat insulating rubber and the like. Bubbles are formed.

  Further, even with an elastic member formed with an adhesive layer having such protrusions, the problem of insufficient followability with respect to the outer peripheral surface of the rim cannot be solved. The problem of non-uniform thickness of the adhesive layer interposed between the two still remains.

  Therefore, the problem of the present invention is that when a rim covering material composed of a sheet-like stretchable member is provided on the outer peripheral surface of the rim via an adhesive, bubbles are caught between the outer peripheral surface of the rim and the stretchable member. It is an object of the present invention to provide a vehicle wheel and a rim covering material capable of preventing the occurrence of a rim, and making the thickness of an adhesive layer formed between a rim outer peripheral surface and a stretchable member uniform.

  The present invention that has solved the above problems is a vehicle wheel in which a portion of the rim outer peripheral surface that is in contact with air in a tire air chamber is covered with a heat insulating rubber fixed to the rim outer peripheral surface. A number of dents are formed on the fixed side surface in the range from the center in the rim width direction to a predetermined distance before both ends in the rim width direction, and a communication path that connects the dents to the tire air chamber side is formed. The heat insulating rubber is fixed to the rim outer peripheral surface by an adhesive interposed between the rim outer peripheral surface and the fixed side surface.

  In addition, the present invention that has solved the above-described problems is that a sub air chamber member made of a Helmholtz resonator that reduces air column resonance noise of a tire air chamber is attached to the outer peripheral surface of the rim, and the sub air chamber member is covered from the outside so as to be covered. A vehicle wheel in which a rubber covering member is fixed to the auxiliary air chamber member and the rubber covering member is fixed to a rim outer peripheral surface on both sides of the auxiliary air chamber member in the rim width direction. The covering member is formed on the surface on the fixed side with respect to the auxiliary air chamber member and the outer peripheral surface of the rim, and a plurality of recessed portions are formed in a range from a center in the rim width direction to a predetermined distance before both ends in the rim width direction A communication path that connects the recess and the tire air chamber side is formed, and the rubber covering member is interposed between the outer side of the auxiliary air chamber member, the outer peripheral surface of the rim, and the surface on the fixed side. Adhesives Characterized in that it is fixed to the chamber member and the rim outer peripheral surface.

  Further, the present invention that has solved the above problems is a rim covering material for a vehicle wheel, the rim covering material comprising a sheet-like stretchable member fixed via an adhesive on the rim outer peripheral surface, The stretchable member includes a plurality of recesses formed on the rim outer peripheral surface side, and includes a through hole that connects the recesses to the surface side opposite to the rim outer peripheral surface side. .

  According to the present invention, when a rim covering material composed of a sheet-like stretchable member is provided on the outer peripheral surface of the rim via an adhesive, air bubbles are prevented from being caught between the outer surface of the rim and the elastic member. It is possible to provide a vehicle wheel and a rim covering material that can make the thickness of the adhesive layer formed between the outer peripheral surface of the rim and the stretchable member uniform.

It is a whole perspective view of the wheel for vehicles of the present invention which equips the rim outer peripheral surface with heat insulation rubber as a rim covering material. FIG. 2 is a partial enlarged cross-sectional view corresponding to the II-II cross section of FIG. 1, and is a partial enlarged cross-sectional view showing a state in which a tire is mounted on a vehicle wheel. FIG. 3 is a partially enlarged perspective view of a heat insulating rubber as a rim covering material provided on a rim outer peripheral surface, and is a view looking down from a tire air chamber side. It is IV-IV sectional drawing of FIG. It is a back view of the heat insulation rubber | gum as a rim coating | covering material. It is a partial expanded sectional view which shows a mode that the tire pressure sensor was assembled | attached to the vehicle wheel which provided the heat insulation rubber in the rim outer peripheral surface. It is a partial expansion perspective view of the vehicle wheel of the present invention provided with a rubber covering member as a rim covering material that covers a sub air chamber member (Helmholtz resonator) disposed on the outer peripheral surface of the rim. It is a whole perspective view of a sub air chamber member. It is the elements on larger scale in the cross section of FIG. 7 corresponding to the II-II cross section of FIG.

A vehicle wheel according to an embodiment of the present invention and a rim covering material used therefor will be described in detail with reference to the drawings.
In the following, the vehicle wheel of the present invention having heat insulating rubber as a rim covering material on the rim outer peripheral surface will be described in the first embodiment, and the vehicle wheel of the present invention having a rubber covering member as a rim covering material will be described. This will be described in the second embodiment.

(First embodiment)
As shown in FIG. 1, a vehicle wheel 1A according to the present embodiment includes a rim 11 and a disk 12 for connecting the rim 11 to a hub (not shown). In FIG. 1, reference numeral 30 denotes a heat insulating rubber as a rim covering material disposed on the rim outer peripheral surface 11d. Hereinafter, after describing the overall configuration of the vehicle wheel 1A, the heat insulating rubber 30 (rim covering material) will be described.

<Overall configuration of vehicle wheel>
As shown in FIG. 2, the rim 11 has bead sheet portions 11a and 11a formed at both ends in the width direction Y (hereinafter, also referred to as the rim width direction Y), and the bead sheet portions 11a and 11a. Rim flange portions 11b, 11b bent in an L-shape from each other, and a well portion 11c in which a portion between the bead seat portions 11a, 11a is recessed toward the inner side in the wheel radial direction Z (the lower side of the drawing in FIG. 2) have.

  The bead portion 21a of the tire 20 is attached to the bead seat portion 11a. As a result, a tire air chamber MC including an annular sealed space is formed between the outer peripheral surface of the rim 11 and the inner peripheral surface of the tire 20.

The well portion 11c is provided for dropping the bead portions 21a, 21a of the tire 20 when the rim is assembled to the tire 20 to the rim 11.
The well portion 11c of the present embodiment is formed toward the hump portion 11j of the inner rim width direction Y (left side in FIG. 2) in the rim width direction center C, and the inclined surface 11c ₁ of the gentle downward slope, It is composed of a hump portion 11k of the outer rim width direction Y (the right side in FIG. 2) and the recess 11c ₂ which is formed toward the rim width direction center C. In other words, the rim outer peripheral surface 11d formed with such a well portion 11c is also curved in the wheel circumferential direction X (see FIG. 1), thereby forming a complex three-dimensional curved surface mixed slowly and rapidly. Yes.

  As shown in FIG. 2, the disk 12 is formed continuously from the outer side in the rim width direction Y of the well portion 11c (the right side in FIG. 2) to the inner side in the wheel radial direction Z. 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. In addition, the material of the rim | limb 11 and the disk 12 is not limited to these, You may form from steel etc.

<Rim covering material>
As shown in FIG. 2, the heat insulating rubber 30 as the rim covering material is disposed on the surface of the rim outer peripheral surface 11d excluding the bead sheet portions 11a and 11a, the rim flange portions 11b and 11b, and the hump portions 11j and 11k. Yes. The heat insulating rubber 30 corresponds to a “sheet-like stretchable member” of the “rim covering material” in the claims, and is formed of a rubber material described later.

Such a heat insulating rubber 30 is formed with a uniform thickness except for both ends in the rim width direction Y. Here, the uniform “thickness” is a macroscopic thickness and means a thickness h (see FIG. 4) that does not take into account the later-described recessed portion 31 formed in the heat insulating rubber 30.
And this heat insulation rubber 30 is formed in cyclic | annular form, and is arrange | positioned over the perimeter of the rim outer peripheral surface 11d.
Further, both end portions of the heat insulating rubber 30 in the rim width direction Y are gradually tapered in a cross-sectional view toward the both ends 30a and 30a. That is, as will be described later, when the heat insulating rubber 30 is fixed to the rim outer peripheral surface 11d via an adhesive, the heat insulating rubber 30 prevents the heat insulating rubber 30 from peeling from the rim outer peripheral surface 11d starting from both ends 30a, 30a. ing.

As shown in FIG. 3, a large number of recesses 31 are formed on the surface 32 on the fixed side of the heat insulating rubber 30 with respect to the rim outer peripheral surface 11d (see FIG. 2).
The recessed portions 31 in the present embodiment have a quadrangular frustum shape, and are arranged so as to be arranged at equal intervals vertically and horizontally along the surface 32 on the fixed side. The shape of the recessed portion 31 in the present invention is not limited to this, for example, a hemisphere, a semi-elliptical sphere, a cylinder, a polygonal column, a cone, a truncated cone, a polygonal truncated cone other than a quadrangular truncated cone, an inverted truncated cone, Various shapes such as an inverted polygonal frustum can be employed. Moreover, the arrangement | sequence of the recessed part 31 is not limited to an above-described arrangement | sequence, It can be set as a hexagonal arrangement | sequence or a random arrangement | sequence.

Such a recessed portion 31 is formed in a range from the center C in the rim width direction shown in FIG. 2 to the front of a predetermined distance between both ends 30a and 30a in the rim width direction. That is, in this embodiment, the recessed part 31 is formed in the other part (part of uniform thickness) except the part which became the above-mentioned taper.
The heat insulating rubber 30 according to the present embodiment does not form the recessed portion 31 at both ends that are tapered, and the both ends are brought into close contact with the rim outer peripheral surface 11d via an adhesive, thereby starting the above-described peeling. Is prevented from forming at the end.

Further, as shown in FIGS. 3 and 4, the heat insulating rubber 30 has a communication passage 34 that communicates each recess 31 and the tire air chamber MC side. The communication path 34 corresponds to a “through hole” of the “rim covering material” in the claims, and connects each of the recessed portions 31 to the surface 33 side opposite to the rim outer peripheral surface 11d side.
As shown in FIG. 4, the communication path 34 (through hole) in the present embodiment extends from the center of the ceiling portion of the recess 31 toward the opposite surface 33 side. As long as it is connected to the recess 31, there is no particular limitation, and it may be extended from the side wall surface of the recess 31 toward the opposite surface 33.

  4 is the length of the upper side of the truncated pyramid that forms the recess 31, the symbol b is the length of the lower side, and the symbol c is the distance between the upper sides of the adjacent recesses 31. , D is the depth of the recess 31, h is the thickness of the heat insulating rubber 30 viewed macroscopically, and d ′ is an adhesive layer 35 made of an adhesive described later. Is the thickness. In FIG. 4, the symbol “c- (ba)” is the distance between the lower sides of the adjacent recessed portions 31.

As shown in FIG. 5, in the heat insulating rubber 30 (rim covering material) in which a plurality of recesses 31 are arranged at equal intervals in the vertical and horizontal directions, the total volume (D) of the recesses 31 per predetermined area is expressed by the following equation (1). Can be expressed as
In FIG. 5, reference numeral 34 denotes a communication path (through hole).

However, in said Formula (1), a, b, c, and d are synonymous with the code | symbol of FIG. 4, and L and W are the length and width | variety of the heat insulation rubber 30 of FIG. In the above formula (1), the term {d × (a ² + b ² + ab) / 3} represents the volume per one recess 31, and {L / (a + c)} × {W / ( The term “a + c)} represents the number of recesses 31 existing per area (L × W).

The thickness (h) of the heat insulating rubber 30 as described above varies depending on the heat insulating performance of the rubber material to be used. For example, a butyl rubber-ethylene propylene rubber mixed composition (containing 50 phr carbon and 6 phr blowing agent) is used as the rubber material. Can be set to about 1.5 to 2.0 mm. However, the thickness (h) of the heat insulating rubber 30 is not limited to this value.
In addition, the diameter of the communication path 34 can be set to about 0.5 mm, and the length can be set to about 1.3 to 1.8 mm, but is not limited to this value.

  Examples of the rubber component (rubber material) of the heat insulating rubber 30 include butyl rubber (IIR) and ethylene propylene rubber (EPDM). In addition, since this rubber component itself has a heat insulating property, the heat insulating rubber 30 can be constituted only by this rubber component, but this rubber component includes a compounding agent usually used in the rubber industry, such as carbon black. These reinforcing agents, vulcanizing agents, vulcanization aids, vulcanization accelerators, anti-aging agents, softening agents, and the like can be appropriately blended.

Further, the heat insulating rubber 30 is more preferably one containing a heat insulating filler or foamed rubber.
As the heat insulating filler, for example, Scotchlite glass bubbles series made of Na borosilicate (manufactured by 3M); CenoSpheres (manufactured by Ashtek) mainly composed of silica and alumina, senolite (manufactured by Sakai Kogyo Co., Ltd.); Inorganic hollow particles such as Winlite (Axes Chemical Co., Ltd.) are desirable.

  Examples of the foamed rubber include those in which a foaming agent contained in an unvulcanized rubber component is foamed during vulcanization to form closed cells or semi-open cells. Among these, foamed rubber having closed cells that are expanded just before becoming semi-open cells is desirable because it is excellent in both heat insulation and tensile strength.

Examples of the foaming agent include N, N′-dinitrosopentamethylenetetramine (DNPT), azodicarbonamide (ADCA), dinitrosopentastyrenetetramine, benzenesulfonyl hydrazide derivatives, oxybisbenzenesulfonyl hydrazide (OBSH), and hydrogen carbonate. Ammonium, sodium bicarbonate, ammonium carbonate, nitrososulfonylazo compound, N, N′-dimethyl-N, N′-dinitrosophthalamide, toluenesulfonyl hydrazide, p-toluenesulfonyl semicarbazide, p, p′-oxybis (benzenesulfonyl) Semicarbazide) and the like.
In addition, each compounding quantity of the above-mentioned heat insulation filler with respect to a rubber component and a foaming agent can be suitably set within the range normally performed in the rubber industry.

In the vehicle wheel 1A (see FIG. 1) according to the present embodiment, such a heat insulating rubber 30 (rim covering material) is interposed between the rim outer peripheral surface 11d and the fixed-side surface 32 (see FIG. 3). It is formed by being fixed to the outer peripheral surface 11d of the rim with the adhesive.
Although there is no restriction | limiting in particular as an adhesive agent, An epoxy-type adhesive agent can be used conveniently.
The total adhesion area (A) when the heat insulating rubber 30 is bonded to the rim outer peripheral surface 11d with an adhesive can be expressed by the following equation (2).

However, in said Formula (2), a, b, c, d, L, and W are synonymous with said Formula (1). In the formula (2), the term represented by 2 × (a + b) × R (wherein R is a term bound by the root in the formula (2)) is one of the recessed portions 31. The total area of the four side wall surfaces in the hit is shown. In addition, a term represented by 2 × (a + b) × R− (b ² −a ² ) (where R is a term bound by a route in the formula (2)) is one of the recessed portions 31. This represents a substantial increase in the adhesion area due to hitting.

  And in such vehicle wheel 1A (refer FIG. 1), the target safety factor (K) of an adhesion area can be prescribed | regulated so that following Formula (3) may be satisfied.

A / (L × W) ≧ K Formula (3)
However, in said Formula (3), A, L, and W are synonymous with said Formula (2).

<Method of forming heat insulating rubber (rim covering material)>
The heat insulating rubber 30 (rim covering material) in the present embodiment can be obtained by molding into the annular shape by a three-dimensional mold molding method. At this time, by providing a portion corresponding to the recessed portion 31 in the cavity of the mold to be used, the annular outer shape and the recessed portion 31 can be formed at the same time when molding the mold.

Incidentally, the communication path 34 (through hole) shown in FIG. 4 can be formed by providing a part corresponding to the communication path 34 (through hole) in the cavity of the mold to be used. It is also possible to form a communication article 34 (through hole) in a molded article having As a tool used for this drilling, it is possible to use a tool in which a plurality of punches that pierce the communication path 34 (through hole) are arranged in parallel on the peripheral surface of the roller at intervals of the communication path 34 (through hole).
Further, as the heat insulating rubber 30 (rim covering material), it is also possible to use a belt-shaped material that has been formed in advance and then vulcanized and bonded into a ring shape.

<Mounting method of heat insulation rubber to rim>
The annular heat insulating rubber 30 (see FIG. 1) is attached to the rim outer peripheral surface 11d (see FIG. 1) by applying an adhesive to the rim outer peripheral surface 11d in advance and then using a fitting device for heat insulation. A method of fitting the rubber 30 is simple.
Examples of the method of applying the adhesive to the rim outer peripheral surface 11d include a method of discharging the adhesive from the nozzle to the rim outer peripheral surface 11d while rotating the rim 11 (see FIG. 1) around its rotation axis. According to the heat insulating rubber 30 (rim covering material), as will be described later, the adhesive layer 35 (see FIG. 4) having a uniform thickness can be obtained by any other application method such as spraying or brushing. ) Can be formed.

  As said fitting apparatus, what is equipped with the diameter-expansion mechanism which expands this to a radial direction can be used, vacuum-sucking several places of the outer peripheral surface of the cyclic | annular heat insulation rubber 30. FIG. In this fitting device, the inner diameter of the annular heat insulating rubber 30 is expanded by the diameter expansion mechanism so as to be larger than the outer diameter of the rim 11. Then, after aligning the diameter-enlarged annular heat insulating rubber 30 to the outer peripheral surface 11d to which the adhesive is applied, the heat insulating rubber 30 is released by stopping the vacuum suction and releasing the heat insulating rubber 30 from the diameter expansion mechanism. The outer rim outer peripheral surface 11d is fitted through an adhesive. As a result, the annular heat insulating rubber 30 is in close contact with the rim outer peripheral surface 11d due to its contraction force, but it is also possible to promote close contact by pressing the heat insulating rubber 30 with a bladder, a mechanical pressure roller, or the like.

At this time, air or excess adhesive interposed between the outer peripheral surface 11d of the rim and the heat insulating rubber 30 passes through the recessed portion 31 and the communication path 34 (see FIG. 4) to the opposite surface 33 side (see FIG. 4). And after wiping off the adhesive agent which came out to the opposite surface 33 side, the vehicle wheel 1A which concerns on this embodiment is completed by hardening an adhesive agent.
As shown in FIG. 6, the tire 20 is attached to the rim 11 after the tire pressure sensor 36 and the like are assembled to the rim 11 in the completed vehicle wheel 1 </ b> A.
In FIG. 6, reference numeral 30 denotes a heat insulating rubber as a rim covering material.

Next, functions and effects of the vehicle wheel 1A and the heat insulating rubber 30 (rim covering material) according to the present embodiment will be described.
In the vehicle wheel 1A and the heat insulating rubber 30 (rim covering material), as described above, when the heat insulating rubber 30 is disposed on the outer peripheral surface 11d of the rim, a portion where the recess 31 is formed when viewed microscopically. Is reduced in thickness compared to other portions. And in the part where thickness was reduced, it will bend more easily compared with the other part. As a result, the heat insulating rubber 30 has excellent followability to the rim outer peripheral surface 11d forming a complicated three-dimensional curved surface.

  Further, in the vehicle wheel 1A and the heat insulating rubber 30, when the heat insulating rubber 30 is disposed on the rim outer peripheral surface 11d via an adhesive, the rim outer peripheral surface 11d and the heat insulating rubber 30 are interposed as described above. The intervening air and excess adhesive escape to the opposite surface 33 side (see FIG. 4) through the recess 31 and the communication path 34.

  As a result, according to the vehicle wheel 1 </ b> A and the heat insulating rubber 30, it is possible to prevent entrainment of bubbles between the rim outer peripheral surface 11 d and the heat insulating rubber 30. Therefore, according to the vehicle wheel 1A and the heat insulating rubber 30, adhesion failure of the heat insulating rubber 30 to the rim outer peripheral surface 11d is avoided, and there is a concern that the heat insulating rubber 30 may be peeled off from the rim outer peripheral surface 11d due to thermal expansion of bubbles. It will be resolved. Therefore, according to the vehicle wheel 1 </ b> A and the heat insulating rubber 30, the reliability can be improved.

  Further, according to the vehicle wheel 1A and the heat insulating rubber 30, as described above, the followability of the heat insulating rubber 30 with respect to the rim outer peripheral surface 11d is excellent, and an extra adhesive between the rim outer peripheral surface 11d and the heat insulating rubber 30 is removed. Therefore, the thickness d ′ (see FIG. 4) of the adhesive layer 35 (see FIG. 4) interposed between the rim outer peripheral surface 11d and the heat insulating rubber 30 can be made uniform. As a result, according to the vehicle wheel 1 </ b> A and the heat insulating rubber 30, it is possible to avoid variations in the degree of curing of the adhesive and variations in the adhesive strength. Therefore, according to the vehicle wheel 1 </ b> A and the heat insulating rubber 30, it is possible to provide a manufacturing method that can stably maintain good quality.

  Further, according to the vehicle wheel 1A and the heat insulating rubber 30, excess adhesive between the rim outer peripheral surface 11d and the heat insulating rubber 30 can be eliminated, so that the adhesive with respect to the rim outer peripheral surface 11d is different depending on the application method. Even if the coating amount varies, the thickness of the adhesive layer 35 interposed between the rim outer peripheral surface 11d and the heat insulating rubber 30 can be made uniform.

  Further, according to the vehicle wheel 1A and the heat insulating rubber 30, since the adhesive enters the recess 31, the bonding area increases compared to the flat surface, so that the heat insulating rubber 30 adheres to the rim outer peripheral surface 11d. Power increases.

  Further, according to the vehicle wheel 1A and the heat insulating rubber 30, the fixing effect of the heat insulating rubber 30 on the rim outer peripheral surface 11d is increased by the anchor effect of the adhesive that has entered the communication path 34 via the recess 31.

  Further, according to the vehicle wheel 1A and the heat insulating rubber 30, the heat insulating rubber 30 covering the outer peripheral surface 11d of the rim can keep the temperature of the running tire 20 high, so that the rolling resistance of the tire 20 is reduced. The fuel consumption of the vehicle can be improved.

(Second Embodiment)
Hereinafter, a vehicle wheel including a rubber covering member as a rim covering member for covering a sub air chamber member (Helmholtz resonator) provided on the outer peripheral surface of the rim will be described.
The configuration of the rubber covering member used in this embodiment is the same as that of the heat insulating rubber 30 as the rim covering material of the first embodiment shown in FIG. 3 except for the material and arrangement thereof. Here, the material and arrangement thereof will be described, and the description of the structure of the covering member as the rim covering material will be omitted.

  Next, FIG. 7 to be referred to is a partially enlarged perspective view of a vehicle wheel according to the present invention including a rubber covering member as a rim covering member that covers a sub-air chamber member (Helmholtz resonator) disposed on the outer peripheral surface of the rim. It is. FIG. 8 is an overall perspective view of the auxiliary air chamber member of FIG. FIG. 9 is a partially enlarged cross-sectional view of FIG.

<Overall configuration of vehicle wheel>
As shown in FIG. 7, the vehicle wheel 1 </ b> B according to the present embodiment includes a sub air chamber member 13 (Helmholtz resonator) and a spacer 15 on the rim outer peripheral surface 11 d. The rubber covering member 40 as the rim covering material in this embodiment covers the rim outer peripheral surface 11d on which the auxiliary air chamber member 13 and the spacer 15 are arranged.

<Configuration of auxiliary air chamber member and spacer>
The auxiliary air chamber member 13 functions as a Helmholtz resonator and is configured to reduce air column resonance sound (cavity resonance sound) in the tire air chamber.
A plurality (four in this embodiment) of auxiliary air chamber members 13 shown in FIG. 7 are arranged on the rim outer peripheral surface 11d so as to be arranged in the wheel circumferential direction X with a predetermined interval.

As shown in FIG. 8, the auxiliary air chamber member 13 includes a main body portion 13a and a communication portion 13b.
As shown in FIGS. 7 and 8, the main body portion 13a is curved along the wheel circumferential direction X, and the curvature thereof is substantially the same as the curvature in the wheel circumferential direction X in the well portion 11c (see FIG. 9) described later. Are set the same.
As shown in FIG. 8, the main body portion 13a includes an upper plate 25b, a bottom plate 25a, and a front plate 25c and a rear plate 25d disposed at both ends in the wheel circumferential direction X, respectively.

The bottom plate 25a is flat in the rim width direction Y, and the top plate 25b is curved like a bow so as to protrude outward in the wheel radial direction Z (upper side in the drawing in FIG. 8). The main body portion 13a, which is a bow and has a middle height, is formed such that the gradient gradually decreases toward both ends in the rim width direction Y, and both end portions thereof become thinner. That is, the main body 13a in the present embodiment has a flat shape on the well 11c (see FIG. 9), as will be described later.
Although not shown, the main body portion 13a includes a sub air chamber formed by being surrounded by an upper plate 25b, a bottom plate 25a, a front plate 25c, and a rear plate 25d.

8 is a tubular member that communicates the auxiliary air chamber with a tire air chamber MC (see FIG. 9) described later. The communication portion 13b is formed so as to protrude in the longitudinal direction of the main body portion 13a from the substantially central portion of the front plate 25c of the main body portion 13a, and the opening at the tip thereof faces upward (outside in the wheel radial direction Z). So that it bends.
The auxiliary air chamber member 13 as described above can be obtained by blow molding a resin such as ABS or nylon.

  As shown in FIG. 7, the spacer 15 is disposed between the auxiliary air chamber members 13. The length of the spacer 15 in the wheel circumferential direction X is set to be approximately equal to the interval between the adjacent main body portions 13a.

As shown in FIG. 7, the spacer 15 is formed of a solid block body having a recess 15 a on one end side in the wheel circumferential direction X. The spacer 15 may be hollow. The communication portion 13b of the auxiliary air chamber member 13 is disposed in the recess 15a.
The spacer 15 can be formed of resin, synthetic rubber or the like.

  The cross-sectional shape in the rim width direction Y in the portion of the spacer 15 where the recess 15a is not formed is formed to be substantially the same as the cross-sectional shape of the main body portion 13a of the auxiliary air chamber member 13. That is, the upper surfaces (outer surfaces) of the auxiliary air chamber member 13 and the spacer 15 arranged on the outer peripheral surface 11d of the rim are flush with the entire length in the wheel circumferential direction X except for the recess 15a.

As shown in FIG. 9, both ends in the rim width direction Y of the auxiliary air chamber member 13 on the rim outer peripheral surface 11d (well portion outer peripheral surface 11i) are stepped from the rim outer peripheral surface 11d (well portion outer peripheral surface 11i). Is almost gone.
Incidentally, in the rim 11 of this embodiment, as shown in FIG. 9, a well portion 11c is formed so as to be recessed immediately inside the left and right hump portions 11j and 11k. The bottom surface of the well portion 11c is formed to be flat in the rim width direction Y (to be cylindrical in the rim width direction Y).
The auxiliary air chamber member 13 and the spacer 15 are arranged on the rim outer peripheral surface 11d (well portion outer peripheral surface 11i) via the rubber material 16. The rubber material 16 is desirably made of a rubber material having better adhesion than the covering member 40, for example, SBR 100% (carbon 50 phr). It is desirable to improve reliability.

<Rim covering material>
The rubber covering member 40 as the rim covering material is formed in an annular shape so as to cover the entire circumference of the rim outer peripheral surface 11d shown in FIG. More specifically, as described above, the covering member 40 is arranged so as to cover the upper surface (outer surface) thereof in the section W in which the auxiliary air chamber member 13 and the spacer 15 exist, as shown in FIG. As shown, there are room portions R, R into which the bead portions 21a, 21a are dropped in the well portion 11c, and rising portions 11f, 11f formed by hung the hump portions 11j, 11k from these space portions R, R. Has been.
However, in order to make the communication portion 13b face the tire air chamber MC, a portion corresponding to the recess 15a of the covering member 40 is cut out.

Also, both end portions of the covering member 40 are gradually thinned and tapered in a sectional view, like the heat insulating rubber 30 in the first embodiment.
And the recessed part 31 and the communicating path 34 are not formed in the both ends of the tapering coating | coated member 40 similarly to the heat insulation rubber 30 in 1st Embodiment.

The material of the covering member 40 may be rubber in this embodiment.
Examples of the rubber component of the covering member 40 include natural rubber (NR), butadiene rubber (BR), styrene butadiene rubber (SBR), isoprene rubber (IR), butyl rubber (IIR), and ethylene propylene rubber (EPDM). It is done. Of these, butyl rubber (IIR) and ethylene propylene rubber (EPDM) are desirable. The rubber component is appropriately combined with a compounding agent usually used in the rubber industry, for example, a reinforcing agent such as carbon black, a vulcanizing agent, a vulcanizing aid, a vulcanization accelerator, an anti-aging agent, and a softening agent. It can also be blended.
Moreover, the material of the heat insulation rubber 30 in 1st Embodiment can also be used for the coating | coated member 40. FIG.

  According to the vehicle wheel 1 </ b> B and the rubber covering member 40 (rim covering material) according to the present embodiment, the effect similar to that of the heat insulating rubber 30 according to the first embodiment is achieved, and the covering member 40 is the auxiliary air chamber. The member 13 (Helmholtz resonator) can be more securely and firmly fixed on the rim outer peripheral surface 11d.

As mentioned above, although this embodiment was described, this invention is not limited to the said embodiment, It can implement with a various form.
In the above-described embodiment, the heat insulating rubber 30 including the rubber component and the rubber covering member 40 have been described as the rim covering material. However, the rim covering material of the present invention may be a rubber component (described above) if it is a sheet-like stretchable member. Natural rubber component and synthetic rubber component in a narrow sense), including those made of plastic having rubber-like flexibility or elasticity.

DESCRIPTION OF SYMBOLS 1A Vehicle wheel 1B Vehicle wheel 11 Rim 11c Well part 11d Rim outer peripheral surface 13 Sub air chamber member 13a Body part 13b Communication part 15 Spacer 20 Tire 30 Thermal insulation rubber (rim covering material)
34 Communication path 40 Rubber covering member (rim covering material)
C Rim width direction center MC Tire air chamber X Wheel circumferential direction Y Rim width direction Z Wheel radial direction

Claims (3)

A vehicle wheel in which a portion of the tire air chamber on the outer surface of the rim that is in contact with air is covered with a heat insulating rubber fixed to the outer surface of the rim,
The heat insulating rubber has a plurality of recesses formed on the surface on the fixed side with respect to the outer peripheral surface of the rim in a range from the center in the rim width direction to a predetermined distance before both ends in the rim width direction, and each of the recesses and the tire air chamber. The vehicle wheel is characterized in that a communication passage communicating with the side is formed, and the heat insulating rubber is fixed to the rim outer peripheral surface by an adhesive interposed between the rim outer peripheral surface and the fixed side surface. . A sub air chamber member made of a Helmholtz resonator for reducing air column resonance noise of the tire air chamber is attached to the outer peripheral surface of the rim, and a rubber covering member is attached to the sub air chamber member so as to cover the sub air chamber member from the outside. A vehicle wheel in which the rubber covering member is fixed to the rim outer peripheral surface on both sides of the auxiliary air chamber member in the rim width direction,
The rubber covering member is formed with a plurality of dents in a range from the center in the rim width direction to a predetermined distance before both ends in the rim width direction on the surface on the fixed side with respect to the auxiliary air chamber member and the outer peripheral surface of the rim. A communication passage that communicates the recesses and the tire air chamber side is formed, and the rubber covering member is disposed between the outer side of the auxiliary air chamber member and the outer peripheral surface of the rim, and the surface on the fixed side. A vehicle wheel characterized by being fixed to the auxiliary air chamber member and the outer peripheral surface of the rim by an interposed adhesive.   A rim covering material for a vehicle wheel, wherein the rim covering material comprises a sheet-like stretchable member fixed on an outer peripheral surface of the rim via an adhesive, and the stretchable member is disposed on the outer peripheral surface side of the rim. A rim covering material for a vehicle wheel, wherein a plurality of dents are formed, and a through hole is provided to connect each of the dents to a surface opposite to the rim outer peripheral surface.

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