WO2001083240A1

WO2001083240A1 - Rim for elastic wheel

Info

Publication number: WO2001083240A1
Application number: PCT/JP2001/003577
Authority: WO
Inventors: Mamoru Horiuchi
Original assignee: Bridgestone Corporation
Priority date: 2000-04-28
Filing date: 2001-04-25
Publication date: 2001-11-08

Abstract

A rim (1) for pneumatic tire, comprising a pair of right and left side flange parts (2), a pair of right and left side bead seats (3) continued to the flange parts (2), and a well part (4) disposed continuously between the bead seats (3), wherein the well part (4) is formed so that the cross-section thereof in lateral direction of a tire comprises a projected part (6) forming a straight-sided shape toward the outer radial direction of the tire and a pair of drop parts (5) are disposed continuously between the projected part and the bead seats on both sides of the projected part, whereby a rim assembly can be performed easily, the installation of a core so as to form a run flat tire can also be performed easily, and an inch-up can be suppressed when the rim is applied to an elastic wheel.

Description

Specification

Rim for elastic wheels

The present invention relates to a rim for supporting a pneumatic tire of an elastic wheel used for a vehicle wheel, and more particularly to a rim for an elastic wheel in which a pneumatic tire and a core can be easily mounted. Background art

According to JATMAYEARB0K (1995 edition), several types of rim contours are standardized and widely used as rims for passenger car wheels. Generally, as shown in FIG. 8, the rim 31 has a pair of left and right flange portions 32, a pair of left and right bead seats 33 connected to the flange portion 31, and a tool connected between the bead seats 33. And a part 34. A drop portion is provided in the bead portion 34 of the rim 31. The bead is dropped on this portion once when the tire is attached / detached, and then the bead on the opposite side is incorporated. When the drop portion is deep, the tire can be easily attached and detached, but the diameter of the inner portion of the rim becomes small, so that it becomes difficult to mount a large-diameter disc. By the way, when the internal pressure of a pneumatic tire decreases due to puncture or the like, the use of a pneumatic tire core that enables safe driving for a certain distance is generally widely known. As a conventional core for a pneumatic tire, for example, a core described in Japanese Patent Publication No. 55-31883 is known. That is, two or more arc-shaped bodies are assembled in an annular shape by overlapping and connecting the ends thereof, and fitted to the outside of the rim portion of the rim on which the pneumatic tire is mounted. When the pneumatic tire comes into contact with the inner surface of the crown part due to the drop, it slides and rotates on the rim part of the rim due to the force applied by the pneumatic tire, and slips between the pneumatic tire and the crown part. This is called a rotating core assembly.

In addition, as an improved wheel technology, various elastic wheels have been proposed so far, in which a vibration isolator is provided between the disk and the rim to improve the vibration isolation performance and the riding comfort. An example For example, Japanese Utility Model Application Laid-Open No. 59-187870 proposes a tire wheel that uses a spring as a vibration isolator to improve riding comfort. It is also known to use rubber as a vibration isolator and arrange it between the rim and the disk. For example, Japanese Utility Model Laid-Open No. 57-73203 discloses that the rim is rubber-like. There has been proposed a disk wheel configured to be connected to a disk via an elastic body. Further, Japanese Patent Application Laid-Open No. 5-338410 discloses an elastic wheel in which a gap is formed between a rim and a disk wheel, and a vibration-proof rubber is interposed in the gap. Furthermore, WO 9833666 discloses a wheel / barrier assembly in which a rubber annular strip is arranged between an inner rim having the same profile as the rim and the rim. I have.

Runflat tires that can drive safely for a certain distance even if the tire pressure is reduced due to puncture, etc., have a higher case stiffness than ordinary tires, so the rim assembly for conventional pneumatic tire rims is not easy. was there. Further, in the structure of the conventional rim, there is a problem that the above-mentioned core mounting is not easy. Furthermore, in the conventional rim, no consideration has been given to the application to an elastic wheel in which an elastic body such as rubber or a spring is interposed between the rim and the disc in order to enhance vibration isolation performance and ride comfort performance. Therefore, an increase in the diameter of the rim (hereinafter referred to as “inch up”) could not be avoided.

Therefore, an object of the present invention is to solve the above-mentioned problems of the conventional rim, to easily perform the rim assembly, easily install the core as a runflat tire, and further to the elastic wheel. An object of the present invention is to provide a rim for an elastic wheel capable of suppressing an in-tap. Disclosure of the invention

As a result of intensive studies to solve the above problems, the present inventor has found that the above object can be achieved mainly by forming the wheel portion of the elastic wheel rim into a specific shape, thereby completing the present invention. Reached.

That is, the present invention relates to a rim for an elastic wheel including a pair of left and right flange portions, a pair of left and right bead seats connected to the flange portion, and a wheel portion connected between the bead seats. The roll portion has a protrusion having a cross section in the tire width direction outward in the tire radial direction and having a mountain shape, and a pair of drops is provided between the protrusion and the bead seats on both sides thereof. The parts are formed continuously.

In the elastic wheel rim of the present invention, it is preferable that a cross-sectional shape of the protrusion in the tire width direction is substantially trapezoidal, and a diameter R _{1 at} a top of the protrusion is a diameter R at the bead seat. It is preferable that the diameter R _{χ at} the top of the protrusion is substantially equal to or smaller than the diameter R 2 at the end of the rim flange. The diameter R at the drop portion is the diameter R at the bead seat. Preferably, the length L 突起 of the protrusion in the tire width direction is within a range of 30% to 60% of the rim width L0. The length L in the tire width direction at the top of the protrusion. Is preferably in the range of 15 to 60% of the rim width L0.

The elastic wheel rim of the present invention facilitates rim assembly as compared with conventional rims, and facilitates core mounting as a runflat tire. Further, when applied to an elastic wheel, an increase in inches can be suppressed. In particular, when one of the flange portions is made detachable, the rim assembling and the mounting of the core are further facilitated. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a sectional view of a rim for an elastic wheel according to an embodiment of the present invention. FIG. 2 is a perspective view of a partially cut-away portion of the elastic wheel rim shown in FIG. FIG. 3 is a sectional view showing a state where a core and a tire are mounted on the elastic wheel rim shown in FIG. 1.

FIG. 4 is a sectional view showing an application example of the rim of the present invention to an elastic wheel.

FIG. 5 is a cross-sectional view showing another application example of the rim of the present invention to an elastic wheel.

FIG. 6 is a sectional view of a rim for an elastic wheel according to another embodiment of the present invention. Fig. 7 is a cross section of the elastic wheel rim with one rim flange part detachable. FIG.

FIG. 8 is a sectional view of a conventional pneumatic tire rim. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a cross section in the tire width direction of an elastic wheel rim according to an embodiment of the present invention. FIG. 2 is a perspective view of the elastic wheel rim with a part cut away. A preferred example of the illustrated elastic wheel rim 1 includes a pair of left and right flange portions 2, a pair of left and right bead seats 3 connected to the flange portion 2, and a well portion 4 connected between the bead seats 3.

In the present invention, such a bead portion 4 has a protrusion 6 whose cross section in the tire width direction is formed in a chevron shape outward in the tire radial direction, and the protrusion 6 and the bead seats 3 on both sides thereof. A pair of doping portions 5 are formed in series between them.

The cross-sectional shape of the protrusion 6 in the tire width direction is preferably substantially trapezoidal as shown in the figure when the core is mounted or applied to an elastic wheel as described later. The diameter R, at the top of the projection 6 is the diameter R at the bead seat 3. It is preferable to make the rim larger than this because the core can be easily mounted, and when applied to an elastic wheel, the rim can be prevented from increasing in inches. However, in order not to impair the rim assembly of the tire, the diameter Ri at the top of the projection 6 is preferably substantially equal to or greater than the diameter Ro at the end of the rim flange 2. Make it smaller. Further, R ₄ in the drop portion 5 is preferably a diameter R in the bead seat 3. 98% or less, more preferably 90% or less. If this value exceeds 98%, it will be difficult to perform rim assembly easily.

In addition, the length L i of the protrusion 6 in the tire width direction is preferably within a range of 30% to 60% of the rim width L 0 from the viewpoint of stability of the core, ease of mounting, and rim assemblability. In addition, the length L _π in the tire width direction at the top of the projection is preferably in the range of 15 to 60% of the rim width L 0.

The bead seat 3 of the rim goes to the drop part 5 at the center of the rim at an inclination angle of about 5 ° from the point 示す indicating the rim diameter, and forms a hump part (not shown) as needed along the way. It is preferable to reach the deep bottom of the top portion 5. By doing so, the bead portion of the mounting tire is crimped to the bead seat 3, and the tire is sufficiently tightened. Here, the height of the hump provided is not particularly limited, and may be within a generally known range.

Next, FIG. 3 shows a punctured state when the tire 20 and the core 21 are mounted on the rim 1 of the above-described preferred embodiment of the present invention. The type of the core is not particularly limited, and a known type may be used.However, the width of the tire to which the contact portion of the core is attached is 0.3 to 0.3 of the tire width. It is preferable to set the range to 5 times in consideration of the point that the contact area after the internal pressure is reduced and the contact pressure is not excessively increased and the weight is reduced.

In the illustrated example, the pneumatic tire core 21 is fitted to the outside of the protrusion 6 of the rim 1. The core 21 is assembled in an annular shape by, for example, overlapping and connecting the ends of two or more arc-shaped bodies. When the pneumatic tire 20 is crushed due to a decrease in internal pressure, the inner surface of the crown portion of the pneumatic tire 20 comes into contact with the outer surface of the core 21 in the radial direction. As shown in the figure, the core 21 has a tire contact portion 22 that comes into contact with the inner surface of the crown portion of the pneumatic tire 20 when the pneumatic tire 20 is crushed due to a decrease in internal pressure, and a radial direction from the tire contact portion. A member having a support portion 23 extending inward and a fitting portion 24 which is connected to the support portion and engages with the lug portion of the rim can be suitably used.

When the rim 1 is applied to an elastic wheel, an elastic member such as an elastomer material or a spring material may be interposed between the inner peripheral surface of the projection 6 and the outer peripheral surface of the disk. As described above, the use of the inner peripheral surface of the projection 6 at the mounting position of the elastic member can suppress the rim from inching up.

Specifically, for example, as shown in FIG. 4, an elastic member 26a, preferably made of a rubber elastic body, is annularly interposed between the rim 1 and the disk 25 to form an elastic wheel. To achieve. As shown in the figure, there is no elastic member near the top of the inner peripheral surface of the projection 6 of the rim 1, and a pair of elastic members 26a are adhered only to the inclined portion by vulcanization or the like. Vibration is absorbed by both the shear deformation and the compression deformation of the elastic member 26a by making contact with the corresponding portion of the outer peripheral surface of the disk, and the ride performance is improved from small input to large input. , To improve vibration and sound insulation performance Become. Here, in the example shown in the figure, the disk 25 is integrated with the base slim, and a convex portion 27 is formed on the outer peripheral edge so as to protrude outward in the radial direction of the tire. The member 26a is adhered, but the disk is not particularly limited to this shape, and a base rim is separately provided, and the disc is integrally or integrally fixed to the outer peripheral surface of the base slim. An elastic member may be interposed between the protrusion 6 and a similar bonding portion. Further, the bonding of the elastic member can be performed by a bonding method such as vulcanization bonding.

Here, the angle α1 formed between the mountain-shaped inclined surface of the protrusion 6 of the rim 1 and the wheel equatorial plane E, and the angle formed between the surface of the disc outer peripheral surface where the elastic member is bonded and the wheel equatorial plane Ε It is not always necessary to be equal to 1. For example, it is possible to make the angle angle 1 larger than the angle / 3 31 so as to be more suitable for compressive deformation than shear deformation. In order to produce a good balance between the shearing force and the compressive deformation of the elastic member 6, the angles are preferably substantially equal. Preferably, both the angle α1 and the angle 31 are 0 to 60 °, more preferably 0 to 30 °.

FIG. 5 shows another application example of the rim of the present invention to the elastic wheel. In the example shown in the figure, an elastic member 26 b made of a rubber elastic body extends to the radially outer end of the upper portion 27 of the disk 25 in the tire radial direction. Differently, an elastic member also exists between the vicinity of the top of the inner peripheral surface of the protrusion 6 of the rim 1 and the disk 25. Accordingly, in this case, the elastic member interposed between the inclined portion of the inner peripheral surface of the projection 6 and the disk 25 can provide the same effect of improving the ride comfort, vibration isolation, and sound insulation as described above. However, for a large input, the elastic member existing between the vicinity of the top of the inner peripheral surface of the projection 6 and the disk 25 acts as a stop.

Next, FIG. 6 shows a cross section in the tire width direction of a rim 11 for a pneumatic tire according to another embodiment of the present invention. The preferred example of the illustrated pneumatic tire rim 11 also has a pair of left and right flange portions 12 and a pair of left and right bead seats 13 connected to the flange portions 12 similarly to the preferred example described above. A bead portion 14 extending between the bead seats 13, wherein the bead portion 14 has a projection 16 whose cross section in the tire width direction has a chevron shape toward the outside in the tire radial direction. Between the protrusion 16 and the bead seats 13 on both sides. A pair of drop portions 15 are formed continuously. The difference from the above preferred embodiment is that the inner diameters of the rims are all uniform as shown in the figure.

In the case of such a rim structure, as shown in FIG. 7, it is easy to make one of the flange portions 12 detachable by a fastening means 17 such as a bolt. If one of the flange portions 12 can be removed, it becomes much easier to mount the tire rim and the core.

Although not shown, the inner diameter of the rim 11 is not made uniform, but the inner diameter of the projection 16 is made larger according to the shape of the projection 16 to reduce the weight. In addition, when applying elastic wheels, it is possible to suppress the increase in inches.

Hereinafter, the present invention will be described based on examples.

Example 1

Size 7.5—The rim of JJX 17 was prototyped as shown in Fig. 1 (corresponding to the code in Fig. 1: R ェ> R ₃ , R ₂ = R ₂ , R ₄ = 0. 85 XR ₃ , L _χ = 0.38 XL ₀ , L ₂ = 0.16 XL _Q ).

Example 2

A rim of size 7. 5- JJX 17, was a prototype type of rim shown in FIG. 7 (corresponding to those in Figure 1:! R] ^ ^^ R χ = R 2, R 4 = 0. 85 XR g, L _χ = 0.41 XL ₀ , Lo = 0.41 x Lo). This rim has one flange part detachable by a bolt.

Comparative example

A 7.5-JJ X17 rim, a conventional rim shown in Fig. 8, was prototyped.

When these prototype rims were fitted with rim sets of tires of size 225/55 ZR 17 and cores of the type shown in Fig. 3, the rims of Examples 1 and 2 were clearly shorter than the comparative examples. In particular, in Example 2, the time was significantly reduced. Industrial applicability As described above, according to the rim for a tire of the present invention, the rim assembly of the tire can be easily performed, the core can be easily mounted as a runflat tire, and further, when applied to an elastic wheel. Inch-up can be suppressed.

Claims

The scope of the claims

1. A pneumatic tire rim comprising a pair of left and right flange portions, a pair of left and right bead seats connected to the flange portions, and a wheel portion connected between the bead seats, wherein the wheel portion has a tire width. A projection having a mountain-shaped cross section in the radial direction outward in the tire radial direction, and a pair of drop portions formed continuously between the projection and the bead seats on both sides thereof. A rim for an elastic wheel, characterized by:

2. The rim for an elastic wheel according to claim 1, wherein the cross section of the protrusion in the tire width direction is substantially trapezoidal.

3. The protruding elastic Wheel rim has claim 1, wherein the size even diameter R _lambda at apex than the diameter R o in the bead seat.

4. The protrusion diameter R _chi said elastic wheel one Le rim of substantially the diameter R o in the rim flange end equivalent or smaller claim 1 than at the top of the.

5. The diameter ₄ in the drop part is the diameter in the bead seat. The rim for an elastic wheel according to claim 1, wherein the rim is 98% or less of the rim.

6. The elastic wheel rim according to claim 1, wherein a length L # of the protrusion in the tire width direction is within a range of 30 to 60% of a rim width L0.

7. The projections 1 5-6 0% elastic wheel rim according to claim 1, wherein the range of the tire width direction length L ₂ is rim width L ₀ of the top.

8. The rim for an elastic wheel according to claim 1, wherein one of the flange portions is detachable.