JPS58177701A - Assembly unit of foam filled tire rim - Google Patents

Abstract

PURPOSE:To prevent the bead part of a tire from causing damage rubbed by a rim, by mounting the bead part between a flange and protrusion under the initial compressive stress. CONSTITUTION:A carcass 5 is rolled around a bead ring 3 from the inside to the outside, and a breaker 6 is arranged to a crown part of the carcass 5. A tire T is assembled to a rim R of same kind for a tubeless tire equipped with a pair of flanges F and a pair of bead seats S tapered about 15 deg., after a tire bead part 4 is set to the seat S of the regular rim, elastic crude fluid of urethane rubber is filled and a hardened elastic material 7 is charged in an internal cavity to form an assembly unit of the tire rim charged with the elastic material. A protrusion P is provided to the seat S of the rim R, for instance, a distance W0 from a nominated diameter designated point Q of the vertex, base width W1 and height h1 are set respectively 30mm., 33mm. and 8mm..

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a foam-filled tire-rim assembly, which is suitable for use mainly in operation on system road surfaces constructed over a predetermined section, for example, as wheels for vehicles for so-called new transportation systems. The aim is to improve ohmic-filled tire-rim assemblies.

With this type of wheel, troubles such as banks can seriously impede and disrupt the regularity and stability of the operation system, so usually, after setting a pneumatic tubeless tire on the tubeless rim, urethane rubber is used instead of air. Other foam solutions are injected into the internal cavity and foamed and hardened.
Bank prevention measures are in place.

However, according to the actual use of tires and wheels filled with 7 ohms, it has been experienced that, compared to pneumatic tires, serious rim slippage failures occur seasonally and unexpectedly.

According to the inventors' study on this point, when the foam filled in the tire of the wheel is exposed to cold, the gas filling the foam becomes soft and the internal pressure of the foam evaporates. , relative slippage occurs between the tire and the rim, and in extreme cases, the bead part rotates freely with respect to the bead seat, causing problems in driving, braking, etc., while the tire bead We have investigated the fact that this can cause rim slippage damage and significantly shorten the life of the tire.

In addition, in this type of wheel, when the bead of the tire used for this wheel receives a small impact when filling with the 7 ohm, it moves inward in the axial direction of the bead seat, making the filling operation impossible. Since there is a risk that this method may be damaged, there is also the disadvantage that it requires time and effort in handling.

Therefore, this invention was developed with the aim of finding a particularly advantageous solution to these drawbacks, and as a result of our efforts in development, the base of the tire's bead remains close to the rim's bead seat, regardless of whether or not the foaming internal pressure is applied. However, this idea was created by adding a device that virtually eliminates movement.

That is, this invention consists of a tread portion, a pair of sidewall portions supporting the tread portion, and a bead portion located at the innermost edge of the sidewall portion and reinforced with at least one bead ring, and this bead portion is adapted to the rim. a 7 ohm filled tire-rim assembly with foam filling into the internal cavity, the rim having a pair of bead seats and seven lugs each extending radially outwardly of the bead seats; , is provided with a protrusion having an apex at a distance corresponding to 80 to 110%, more preferably 85 to 98%, of the base width of the bead part from the designated point of the nominal diameter, and this protrusion is located at a distance of 0 to 0 of the rim diameter. .17-1.75
Preferably, the height is 0.35 to 1.28%, and the inner surface in the axial direction of the protrusion has a gentler slope than the outer surface, and more preferably, the outer surface has a slope of 15 to 90% relative to the bead. °, in particular, exhibits a chevron-shaped cross section inclined at an angle of 21S to 65', and in this way, when assembling the rim, the bead part is placed under the initial compressive stress between the 7 langes of the bead part of the rim and the protrusion. The solution for the above wig is to attach it to the wig.

Here, the nominal diameter designation point of the rim is given by the point where the extension of the inclination of the bead part (usually an angle of I Is' with respect to the axial direction) intersects the tangent at the inflection point of the 7-lunge arc, and the bead part Base width refers to bead toe.

In this invention, the protrusions exhibiting a chevron-shaped cross section at the bead part may be either continuous on the horse of the rim or dispersion arranged at appropriate intervals on the circumference, but from the nominal diameter designated point at the apex to the beet part. If the distance along the line is less than 80 parts of the base width of the bead part, it will not be possible to stably set the bead part between it and the 7 lunge, and the bead toe will be forced to deform, resulting in incomplete compatibility with the rim. As a result of relative slippage caused by
It is not possible to bring about the desired effect.

In addition, the axially inner side of the protrusion has a gentler slope than the outer @ surface, and the inclination of this slope with respect to the bead seat is inner ol[TT'
When setting the tire bead part on the bead seat in the preferred range of 25 to 65 degrees, there is no particular problem.On the other hand, if the slope of the outer surface is not relatively large, the tire bead base part This is undesirable because it tends to move easily and prevents relative slippage.

Next, is the height of the protrusion from the bead seat 0.1? less than %,
This is undesirable from the viewpoint of suppressing the movement of the bead base during load transfer due to low internal pressure.On the other hand, if it exceeds 1.75%, although it is effective in suppressing the movement, it may cause the tire bead to move to the normal bead seat. Insertion becomes difficult.

FIG. 1 shows an embodiment of this invention, in which the tire size is 815/75Rg2. The case of IS was shown in the cross section of the left half.

This tire T consists of a tread 1, a pair of sidewall parts 2 supporting the tread, and a bead part in which the innermost edge of the sidewall part 2 is reinforced by a bead ring 8. According to custom, a carcass b is wrapped around the bead ring 8. The carcass 5 has a breaker 6 at its crown.
It is arranged.

After assembling the rim to the same type of rim R as the one used for tires, and setting the tire bead section to the bead seat S of the regular rim, inject the urethane rubber foam stock solution and harden the foam 7 into the internal cavity.
Fill to form a 7 ohm filled tire-rim assembly. The carcass 5 is made of metal cords arranged in the radial direction of the tire, and the breaker 6 has a four-layer structure in which metal cords are alternately laminated at a relatively small angle with respect to the equator of the tire. do. Note that reinforcing materials for the bead portion and the like are omitted from illustration.

Now, a protrusion P is provided on the bead seat S of the rim R, and its apex is the distance Wo from the nominal diameter designation point Q by 80 degrees, and the base width W0 of the bead section of the tire T is the main part before the tire is installed. In Fig. 8 shown, 88vm. Therefore, Wo is approximately 91% of W□, and the height hl measured perpendicular to the bead seat S is 8cm, so the nominal diameter of the rim R is φ. It was set to 0.52%. - The outer diameter φ of the protrusion P was set to 9 mm, or 9%, of the inner diameter φ of the bead ring 8 of the tire T. This is 96.8-99.2%
is preferred.

The angles α and −α between the axially outer @ surface and inner @ surface of the protrusion P with the bead seat S are each 4 f l g7.5, the first
As shown in Table 1, which shows the results of comparing the foam-filled tire-rim assembly shown in the figure with the conventional one, this invention has significantly improved rim slippage, especially during low internal pressure load transfers in winter. I can see that it is being done. Furthermore, troubles during foam filling were eliminated, and the work time was significantly shortened. (Table 1-1) The rim slip test method is an actual vehicle driving test in which a certain amount of restraining force is applied over a certain distance, and the rim is The amount of relative slip in the circumferential direction between the tire bead and the conventional product was measured by 100%.
It is expressed as an index. In the rim slip acceleration test, the smaller the index, the better, including the urethane rubber injection work time.

As described above, according to this invention, when a vehicle using a foam-filled tire-rim assembly is exposed to cold temperatures, relative slippage, which was conventionally considered unavoidable, can be reduced to an advantage while improving the workability of rim assembly. It can be solved.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of an embodiment of this invention, and Figure #18 is a cross-sectional view of the main part. T...Tire R...Rim P...Protrusion Q...Nominal diameter designation point procedural amendment June 23, 1982 1. Indication of the case 1982 Patent Application No. 60872 2. Invention Name: Elastic body-filled tire - Rim assembly 3, Patent applicant related to the amended case (527): 1 person other than Brideston Tire Co., Ltd. (corrected) Description 1, Title of the invention: Elastic body-filled tire - Rim assembly 2, Claim L Consisting of a tread part, a pair of sidewall parts supporting the tread part, and a pair of bead parts located at the innermost edge of the sidewall part and reinforced with at least one bead ring,
This bead portion is adapted to the rim and then the internal cavity is filled with elastic material to form an elastic-filled tire-rim assembly, and the rim has a pair of bead seats, each extending in the radial direction to the outside of the bead seats. In addition to having seven lunges that extend,
The bead seat is provided with a protrusion having an apex at a distance corresponding to 80 to 110% of the pace width of the bead portion from the nominal diameter designated point, and this protrusion has a diameter of 0.17% of the rim diameter.
An elastic-filled tire-rim assembly characterized in that the axially inner surface of the protrusion has a chevron-shaped cross section with a gentler slope than the outer surface. l The axially outer surface of the protrusion is 15 to 90 mm relative to the bead seat.
Among others, a lid assembly with a slope in the angular range of 385-65. The assembly according to item 1 or 2, wherein the apex of the protrusion is located at a distance of 85 to 98% of the bead base radius from the nominal diameter designated point of the rim. 1 The height of the protrusion is 0.86 to 1. 112 g or the assembly according to 8, which is 2% g. 8. Detailed Description of the Invention The present invention relates to an elastic-filled tire-rim assembly;
Operation mainly on system road surface constructed over a specified section,
The object of the present invention is to improve an elastic-filled tire-rim assembly suitable for use as a wheel for, for example, a so-called new transportation system vehicle. For these two types of wheels, troubles such as punctures will decisively disturb the regularity and stability of the operation system, so after installing pneumatic tubeless tires on tubeless rims, urethane tires are used instead of air. Rubber or other elastomer solution is placed inside the internal cavity. However, according to the actual use of tires and wheels filled with such elastic material, compared to pneumatic tires, severe rim slippage failures have occurred seasonally and unexpectedly. According to the results of the inventors' studies on this point, the elastic body filled in the tire of the wheel contracts when exposed to cold, and the internal pressure of the filler evaporates, causing a relative gap between the tire and the rim. This can cause slippage, and in extreme cases,
The fact that the bead part rotates freely relative to the bead seat, causing problems in driving, braking, etc. of the vehicle, while also causing rim displacement damage to the bead part of the tire, which shortens the life of the tire. was investigated. In addition, in this type of wheel, if the bead of the tire used for this wheel receives a small impact when filling with the elastic body, it moves inward in the wheel direction of the bead seat, making the filling operation impossible. Since there is a risk that this method may be damaged, there is also the disadvantage that it requires time and effort in handling. Therefore, the present invention has been developed with the aim of particularly advantageous solutions to such drawbacks, and as a result, the base portion of the tire bead portion is
This invention was created by adding a device to the bead seat of the rim that virtually eliminates movement. That is, the present invention comprises a tread portion, a pair of sidewall portions supporting the tread portion, and a bead portion located at the innermost edge of the sidewall portion and reinforced with at least one bead ring, and the bead portion is adapted to the rim. an elastic-filled tire-rim assembly in which an internal cavity is filled with an elastic material; From the designated point of the nominal diameter, a protrusion with an apex is provided at a position that separates the F# width from the designated point to the base width of the bead portion, preferably 85 to 98 qhs, and this protrusion is 0.17-1.75
%, especially OJ 5 to 1.2 g %, and the axially inner surface of the protrusion has a gentler slope than the outer surface, more preferably the outer surface has a height of 15 to 9o0 with respect to the bead seat.
, in particular, exhibiting a chevron-shaped cross section inclined at an angle of 26 to 65°, and in this way, when assembling the rim, the bead portion is installed under initial compressive stress between the 7 langes of the bead seat of the rim and the protrusion. This is the solution to the above *m. Here, the nominal diameter designation point of the rim is given by the inclination of the bead seat (usually the point where the extension of 15 degrees with respect to the axial direction intersects the tangent at the inflection point of the 7-lunge arc, and the base of the bead part. The width refers to the distance from the bead toe to the bead heel (the point where the outward extension of the bead's inner peripheral generatrix and the extension of the bead's outer contour intersect). In this invention, the protrusion that has a chevron-shaped cross section at the bead seat is
It may be either continuous on the shoulder of the rim or distributed at appropriate intervals on the scrap line, but the distance from the nominal diameter designation point at the apex along the bead seat should be 80% of the base width of the bead. If it is less than 110%, it will not be possible to stably set the bead part between the 7 lunge and force the bead toe to deform, resulting in relative slippage due to incomplete fit with the rim. If it exceeds this, the compression action of the bead base will not be sufficient, so there is no point in providing the protrusion, and the desired effect will not be brought about the problem that would occur without it. The slope is gentler than that on the outer surface, and the slope of this slope with respect to the bead seat is 25~25 on the inner surface.
When setting the tire bead part on the bead seat in the good luck range of 65, there is no particular problem, and unless the slope of the unilateral side is relatively large, the tire bead base part will be easy to move during load transfer due to low internal pressure. It is undesirable because it prevents relative slippage. Next, if the height of the protrusion from the bead seat is less than 0.17%,
This is undesirable from the viewpoint of suppressing the movement of the bead base part during load transfer due to low internal pressure.On the other hand, if the internal pressure exceeds 1.75%, it is effective in terms of suppressing effect, but on the other hand, the tire bead part towards the regular seat etc. Fig. 1 shows an embodiment of the present invention, in which the tire size is 815/F5 R! L5
The case was shown in the cross section of the left half. This tire T consists of a tread 1, a pair of sidewall parts 2 supporting the tread, and a bead part 4 in which the innermost edge of the sidewall part 2 is reinforced by a bead ring δ. Rewind from the inside to the outside, and the breaker 6 is placed at the crown of the carcass 6.
It is arranged. This tire T is assembled on a rim R similar to that used for tubeless tires, which has a pair of 7 lunges 1 and a pair of bead seats S tapered at approximately 15 degrees, and the tire bead portion 1 is attached to the bead seat S of the regular rim. After setting, an elastic body solution of urethane rubber is injected and the internal cavity is filled with the hardened elastic body 7 to form an elastic body filled tire-rim assembly. The carcass 5 is made of metal cords arranged in the radial direction of the tire, and the breaker 6 has a four-layer structure in which metal cords are alternately laminated at a relatively small angle with respect to the equator of the tire. . Note that reinforcing materials for the bead portion 1 and the like are omitted from illustration. Now, a protrusion P is provided on the bead seat S of the rim R, and its apex has a distance of 1llW0 from the nominal diameter designation point Q of 5 ounces. The base radius W1 of the bead part 4 of the tire T is 874 m in Figure 2, which shows the main part before the tire is installed, so Wo is approximately 91 m, and the height ho measured perpendicular to the bead seat S is 8.
Therefore, the nominal diameter of the rim R is Da. I made it to 0.5g whisper. The outer diameter 6 of the protrusion P was 97.9% of the inner diameter □ of the bead ring 8 of the tire. This is 96.8~9
9.2% is preferred. The angles α□ and α between the axially outer surface of the protrusion P and the bead seat S on the inner surface are 45,357. It is lS. As shown in Fig. 111, which shows the result of comparing the elastic body-filled tire-rim assembly shown in Fig. 1 with the conventional one, this invention is particularly useful when transferring loads with low internal pressure in winter.
It can be seen that rim slippage has been significantly improved. Additionally, troubles during filling the elastic material have been eliminated, and work time has been significantly shortened. [Table 1] The rim slip test method is to perform a driving test on an actual vehicle, apply a certain amount of braking force over a certain distance, and measure the amount of relative slip in the circumferential direction between the rim and the tire bead. 100
It is expressed as an index. In the rim slip acceleration test, the smaller the index, including the urethane rubber injection work time, the better. As described above, according to the present invention, when a vehicle using an elastic-filled tire-rim assembly is exposed to cold weather, relative slippage, which was conventionally considered unavoidable, can be reduced in accordance with the workability of rim assembly. can be resolved favorably. 4 Brief explanation of the drawings Fig. 1 is a sectional view of an embodiment of the invention, and Fig. 8 is a sectional view of the main parts◎! ... Tire R ... Rim P ... Protrusion Q ... Nominal diameter, designated point Patent applicant Prideston Tire Co., Ltd. Kinsha procedural amendment (method) % formula % 1. Indication of the case 1982 Patent Application No. 60872 2 Name of Invention Elastomer Optical Tire-Rim Assembly 3 Relationship with the Amendment Case Patent Applicant (527) Brideston Tire Co., Ltd. (1) Letter of Specification 1 Purchase No. 2 In the fourth line of the same page, "3. Utility model registration - scope of claims" should be corrected as "8. Scope of claims." (2) Change "8. Detailed explanation of the invention" on page 2, line 9 of the same page to "
8 Detailed Description of the Invention".

Claims (1)

[Claims] L: Consisting of a tread portion, a pair of sidewall portions supporting the tread portion, and a pair of bead portions located at the innermost edge of the sidewall portion and reinforced with at least one bead ring,
The bead portion is adapted to the rim and then formed into a form-filled tire-rim assembly in which the internal cavity is foam-filled, the rim having a pair of bead seats and a flange each extending radially outwardly of the bead seats. In addition, the bead seat is provided with a protrusion that has an apex at a distance corresponding to 80 to 110% of the pace width of the bead portion from the nominal diameter designated point, and this protrusion ．．
A foam-filled tire-rim assembly rest characterized by having a height of 17 to 1.96% and an axially inner surface of the protrusion exhibiting a chevron-shaped cross section with a gentler slope than the outer surface.
The assembly according to 1, wherein the axially outer surface of the protrusion forms an angle range of 15 to 901 or g6 to 65 degrees with respect to the bead seat. 1t or 2 assembly surfaces located apart from 85 to 98% of the rim diameter 1, 2' where the height of the protrusion is 0.86 to 1.28% of the rim diameter! or the assembly described in 8.