JPS58110304A - Tire assembly body - Google Patents

Abstract

PURPOSE:To prevent a side protector and tire from being damaged by providing a protruded cradle pressed to the side wall section of the tire by pressure from a rim flange on the side protector of the tire for a construction vehicle. CONSTITUTION:A side protector 10 is an annular body composed of a base section 11, protrusion section 12 and head section 13, and the base section 11 is pinched between a bead section 5 and rim flange 8 and is fixed by means of the air pressure of the tire. The protrusion section 12 protrudes outward in the axial direction from the side wall section 4 to cover the external face of the side wall section 4, and the outer end section of a protruded cradle 11b and the head section 13 is pressed to the external face of the side wall section 4 near a shoulder section 3. The inner diameter D of the side protector is slightly larger than the inner diameter of the bead section 5, and the length Y in the radial direction between the inner periphery of the base section 11 and the outer edge of the head section 13 is made 50-83% of the cross section height H of the tire.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tire assembly, and relates to a tire assembly in which a base portion of a side protector, which is formed into a certain shape, is sandwiched between a bead portion and a rim flange of a tire for a construction vehicle. The outer edge of the head is pressed against the sidewall of the tire by the reaction force from the upper end of the rim flange, thereby improving the rigidity of the side protector itself.
This increases the pressure on the tire and significantly reduces damage to the side protector and tire sidewall.

Generally, tires for construction vehicles that are used under harsh working conditions in rock crushing plants, mines, etc. are equipped with side protectors to completely prevent cut damage to the sidewalls caused by rocks and the like.

As a conventional tire with side protector, even if it is
A protrusion extending in the width direction of the tire is provided in the vicinity of the sidewall near the shoulder of the tire. There is a known structure in which the edge is closely aligned with the sidewall surface along the inner circumferential hem of the tire's overhanging protrusion (Utility Model Publication No. 55/16090).
(See Publication No. 5). However, since this protector has a slightly curved shape with a large curvature, it is difficult to firmly bond it to the sidewall surface as it is, so the outer edge is held at the inner skirt of the overhanging protrusion. It is necessary to completely prevent the protector from separating from the tire, so not only does the tire shape have to have a special structure, but also because the protector is in close contact with the sidewall surface of the tire.
When a rock or the like penetrates the protector, the sidewall portion of the tire receives a direct impact and is likely to cause cut hot water loss.

In addition, the middle part of the protector is shaped to accommodate a bulge of the side wall that projects laterally in the footprint area of the road surface in response to an electrical charge on the tire, and the inner peripheral part is connected to the rim via a coupling device. There is also known a tire in which the outer peripheral portion is elastically biased to continuously engage the side wall in the tread area of the tire when the tires are combined (Japanese Patent Laid-Open No. 55-2568).
(Refer to Publication No. 8), this protector requires a special connecting device, so the shape of the rim must also be special, and there is a problem that it cannot be installed on commonly used rims and tires. be.

The present invention has been made to solve all of the above problems, and an object of the present invention is to provide a sidewall with a protruding seat on the base that is pressed against the sidewall of the tire by the pressing force from the rim flange. SUMMARY OF THE INVENTION An object of the present invention is to provide a tire assembly that is fully equipped with a protector, and improves the rigidity, pressure bonding force, resistance to rocks, etc., and cut resistance of the side protector, and improves the side protector and the tire. In addition to significantly reducing damage to the sidewall portion, another object of the present invention is to provide a side protector that is easy to mold and can be easily attached to commonly used tires and rims.

That is, the present invention, as in the illustrated embodiment, includes a tire 1, a rim 7, and a side protector 1D.
The side protector 10 includes a base portion 11 and a protruding portion 12.
and a head 16, the base portion 11 is sandwiched between the bead portion 5 of the tire and the rim flange 8, and the protrusion portion 12 protrudes axially outward of the sidewall portion 4 of the tire. In the tire assembly, the base portion 11 of the side protector 10 covers the outer surface of the sidewall portion 4, and the outer edge of the head portion 16 is pressed to the outer surface of the sidewall portion 4 adjacent to the shoulder portion B of the tire.
The outer surface 11aW extending from the inner edge of A protruding seat 11b is located in the vicinity of the upper end of the lunge 8.
The present invention relates to a tire assembly characterized in that the projecting seat 11b is pressed against the sidewall portion 4 of the tire by the upper end portion of the rim 7 flange 8.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a half-sectional view (meridional cross-sectional view) including the axial center line of a tire assembly fully equipped with the side laro tilter of the present invention.
It is. This tire 1 is a tire for a construction vehicle having a non-earth structure or a radial structure, and reference numeral 2 denotes a tread portion, 6 a shoulder portion, 4 a sidewall portion,
5 shows the entire bead portion. 6 is the bottom surface of the groove provided in the tread portion. The bead portion 5 of the tire is the rim 7
It is incorporated into the 7 lunge 8.

The side protector 10 is an annular body consisting of a base part 11, a protrusion part 12, and a head part 16. The base part 11 is sandwiched between the bead part 5 of the tire, the rim 7, and the flange 8, and the side protector 10 is configured to adjust the air pressure of the tire. Fixed by The protrusion 12 is
The head 16 protrudes axially outward from the sidewall portion 4 of the tire, runs behind the outer surface of the sidewall portion 4, and is mounted with the outer edge of the head 16 crimped onto the outer surface of the sidewall portion 4 adjacent to the shoulder portion 6. ing.

In the above tire assembly, the mounting height Yl of the side protector 10 is Yl/I-1=0.4.5 to 0.75 with respect to the cross-sectional height H of the tire.

If Yl/I-K O, 45, it becomes impossible for the side protector 10 to sufficiently cover the sidewall portion 4, making it difficult to prevent cut damage to the tire, and -10,000 Yl/H> If it is 0.75, the side protector 10 is close to the road surface, so the side protector 1
0 itself is not easily damaged, and the side protector 10
This is not preferable because it reduces the rigidity of the tire and the pressure force against the outer surface of the sidewall portion 4 of the tire.

Further, the amount of protrusion X in the tire axial direction of the protruding portion 12 of the side protector 10 from the outermost surface of the sidewall portion 4 is X/W' = 0.05 to 0.0 with respect to the cross-sectional width W of the tire.
22. If X/W<0.05, not only the rigidity of the side protector 101, the resistance force upon contact with rocks, etc., and the cut-off performance will be weakened, but also the inner surface of the side protector 10 will be weakened when the tire touches the ground. Since both the side protector 10 and the side wall part 4 rub against the outer surface of the side wall part 4, they are not likely to wear out easily.On the other hand, if X/W) is 0.22, the amount of protrusion becomes excessive. This is not preferable because the side protector 10 itself is likely to be damaged.

In order to attach the side protector 10 to the tire with the height Yl and the protrusion amount X in the above relationship, the original dimensions of the side protector 10 must be regulated so as to satisfy the following conditions.

FIG. 2 is a sectional view of the side protector of the present invention in its original form. The inner diameter of the side protector is slightly larger than the inner diameter of the bead portion of the tire, and is the radial length between the inner peripheral edge of the base portion 11 and the outer edge of the head portion 16. Y is the cross-sectional height of the tire. It is 50 to 83% of the height H.

Therefore, the radial tangent line perpendicular to the axial direction from the inside of the base portion 11 of the side protector and the head portion 16
The axial length A between the side protector and the outer edge of the side protector shall be A/Y20.08 to 0.25 with respect to the cross-sectional height Y of the side protector. If A/Y < 0.0 s, the pressure of the outer edge of the head 16 against the outer surface of the sidewall portion 4 decreases when the head 16 is attached to the tire, and pebbles or the like may form between the side protector and the tire. It becomes easier to invade, while A/Y > 0.
If it is 25, the protrusion amount X of the side protector in the tire axial direction becomes excessive and the side protector itself becomes easily damaged, which is not preferable.

In addition, the axial length B between the outermost surface of the protruding part 12 of the side protector and the radial direction of the base part 11 is equal to the axial length A between the outer edge of the head 16 and the base part 11.
The length A + B) obtained by adding the above is (A + B)/Y = 0.08 to 0.60 with respect to the cross-sectional height Y of the side protector. If (A0B)/Y<sail08, or (
A+B)/Y>0.6 o, the ratio Y+/Hk of the installation height Yl of the side protector and the cross-sectional height H of the tire is the maximum and minimum allowable value, respectively, and the above X/w For the same reason as stated regarding the ratio, this is not preferable because it may reduce the rigidity of the side protector itself or cause damage to it.

Furthermore, the base portion 11 of the side protector is formed into a curved surface whose original cross-sectional shape of the outer surface 11a from the inner circumferential side to the outer circumferential side substantially matches the cross-sectional shape of the inner surface of the rim 7 flange 8. A protruding seat 11b'l is provided in a portion close to the upper end of the rim flap (-) 8 between the outer peripheral side of this curved surface and the protrusion 12, and the protruding seat 11b'l is gently curved with the protruding edge 11c as the apex. This shape is connected to the inner peripheral side of the protrusion 12 of the side protector.

In this invention, by making the base portion 11 of the side protector have the above-described configuration, the projecting seat 11b receives the pressing force from the upper end portion of the rim 7 flange 8 and is pressed against the sidewall portion 4 side of the tire. The outer edge of the head 16 is pressed against the outer surface of the sidewall portion 4 of the tire, but the outer edge of the head portion 16 is tightly pressed against the outer surface of the sidewall portion 4 of the tire without impairing the properties of the base portion 11. In order to bring them into close contact by force, it is necessary to set the original dimensions of the base portion 11 as follows.

The axial length Pw between the protruding edge 11c of the protruding seat 11b and the outer surface of the inner edge of the base portion 11 is Pw/Rw=0.70 to 1 with respect to the i analysis surface width ttw of the rim fledge 8. .20. Pw/H,w (In the case of the sail 70, the wall thickness of the protruding seat 11b portion becomes thinner, and sufficient rigidity and pressure bonding force to the tire cannot be obtained. On the other hand, Pw/Rw > 1.20
In this case, the protruding seat 11f) protrudes largely to the outside of the rim 7 flange 8, and the pressing force received from the upper end of the rim flange 8 is dissipated to the outside in the axial direction of the tire, reducing the pressing force to the tire. In addition to this, the cost increases due to the increased weight of the side protector itself, which is undesirable.

The inner diameter Pa of the bent edge 11C of the bent protruding seat 11b is slightly smaller than the outer diameter Ua of the upper end of the applied rim 7/gear 8, so that Pa/Ka=0.99~ It is appropriate to set it to 0.96. P a /Ra ) 0, 9
If it is 9, not only will the suppressing force received from the upper end of the rim flange 8 be insufficient and the pressure force against the tire will be reduced, but also the curved surface (outer surface) 11a of the base portion 11 will cause wear and tear on the base portion 11. Damage is more likely to occur.

On the other hand, if Pa/Ra (0.96), the projecting seat 1
This is not preferable because it becomes difficult to attach it to the upper end of the 1'btv mufler/ji 8.

Further, the radius of curvature Pr of the curved surface 11a is set to be approximately equal to the radius of curvature Rr of the inner surface of the rim flange 8, and Pr/H,
r=1. o O~0.60. When Pr/Rr>1.00, the pressing force between the protruding edge 11c of the protruding seat 11b and the upper end of the rim flange 8 is insufficient, and Pr/l(, r<0.60-C). In this case, the seating of the protruding seat 11b on the rim 7 flange 8 becomes unstable, which is not preferable.

In addition, the wall thickness t of the inner edge of the base portion 11 is 1°.
Preferably 2 to 5 hu. If the wall thickness t is 10 cm or less, when the side protector is attached to the tire, when the base portion 11 is sandwiched between the bead portion of the tire and the rim flange, it can be fixed with sufficient tightening force. There is no possibility of air leakage or misalignment between the tire bead and the rim 7 lunge.

As mentioned above, by controlling the original dimensions of the protector and molding it from an elastic material such as rubber or synthetic resin, it is possible to improve the rigidity of the protector itself, the pressure applied to the sidewall of the tire, and the resistance to rocks, etc. However, as necessary, as shown in FIG. By burying it in at least one layer, it is possible to further improve the resistance to rocks and the like and cut resistance in addition to the above characteristics. Further, by extending the reinforcing layer 15 to a position close to the inner edge of the base portion 11, the pressure force of the side protector against the tire can be significantly increased.

Materials for this reinforcement -15 include nylon woven with blind weave, plain weave, etc., organic fibers such as rayon cord, etc.
Inorganic fibers such as glass cords and steel cords, wire mesh, iron plates, etc. are used, but in addition, short fibers are used, and organic fibers of the same or different types are spliced together (
For example, waste scraps of the carcass layer) may be used.

In addition to burying the reinforcing layer 15, we also provide reinforcing ribs 18f on the inner surface near the center of the protrusion 12 of the side protector in multiple locations protruding radially to increase the rigidity of the side protector itself, improve rock formations, etc. It is also possible to further improve the resistance and cut resistance, as well as the pressure bonding force with the sidewall portion of the tire.

It is preferable that the reinforcing ribs 18 are provided in at least six locations at equal intervals by appropriately selecting the thickness n and the circumferential width, and the radial creeping length m thereof is equal to the radial creeping length of the side protector. It is necessary to set m/L=0.35 to 0.65 for L. m/L (Sail 35 does not provide the required reinforcing function, while m/L) 0.65 causes the reinforcing ribs 18 to come into contact with the outer surface of the tire sidewall and rub when the side protector is attached to the tire. This is undesirable because it causes mold to grow on both the reinforcing sole and the sidewall portion, and it is not preferable if the number of installations is less than 6 because a uniform reinforcing function cannot be obtained around the entire circumference of the side protector.

Next, an embodiment in which the present invention is applied to the construction vehicle tire shown in FIG. 1 will be described.

The tire size is 23.5-25 20PR,
All specimens with a cross-sectional height H of 492.5 mm and a cross-sectional width W of 615 mm were used. The cross-sectional height SH from the outer diameter of the tire to the outermost edge P of the groove bottom 5 is 196 mm. The rim has a size of 19.50X25 and a rim diameter of 635''/.

The dimensions of the rim fledge are as follows:

14w=4.4. +5mm, Ra=762mm1
(, r=38-1) The pharynx side protector was made entirely of rubber and was molded with a reinforcing layer and reinforcing ribs.

The original dimensions and installed dimensions of the side protector are as shown in Table 1.

Table 1: When the side protector is attached to the tire, the distance C between the outer edge of the head of the side protector and the outermost edge P of the groove bottom is 10 mm.

When a construction vehicle assembly tire equipped with the side protector of the above embodiment was tested at a stone crushing site, it was found that the rigidity of the side protector itself was sufficient even without reinforcement or 'm' in the pace part. It does not fall outward in the axial direction of the tire, and is equivalent to or better than conventional side protectors in terms of the pressure force between the outer edge of the head and the outer surface of the tire sidewall, resistance to crushed stones, and cut resistance. There was no occurrence of foot or rim misalignment.

As explained above, the present invention has the pace part of the side protector sandwiched between the bead part of the tire and the rim 7 lunge, so that the protruding part protrudes outward in the axial direction from the side wall part of the tire, and In a tire assembly in which the outer surface of the sidewall portion is pressed against the outer surface of the sidewall portion near the shoulder portion, a projecting seat is provided in the cage near the upper end of the rim flange as a curved outer surface of the pace portion of the side protector. - The projecting seat is configured to receive pressing force from the upper end of the rim 7 lange. Therefore, according to the present invention, the side protector can be brought into close contact with the outer surface of the sidewall portion of the tire with strong pressure due to the reaction force of the fully protruding seat on the outer edge of the head portion of the side protector. Pebbles, etc. will not enter between the tire and the side protector and damage the tire, and even when the tire touches the ground, the side protector will not come into contact with the outer surface of the sidewall and wear out both. There is no such problem, and the rigidity of the pace part of the side protector is ensured by the protruding seat, which has the effect of improving the durability of the side protector itself and significantly reducing side damage to the tire. There is.

Moreover, the side protector of the tire assembly of this invention is
It can be applied as is to all commonly used tires and rims, is easy to mold, and has the advantage of being simple and easy to attach to tires.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of the tire assembly of the present invention, and FIG. 2 is a FFI drawing of the side protector of the present invention in its original form. In the figure, 1 is the tire, 3 and 4.5 are the tire shoulder, side wall, and bead, respectively, 7 is the rim, 8 is the rim fledge, 1 [J is the side protector, 11, 1
Reference numerals 2 and 15 are the base, protrusion, and head of the side protector, 11a is the outer surface of the base, and 11b is the claw-shaped seat of the base. Patent Applicant Yokohama Rubber Co., Ltd. Agent Patent Attorney Tetsuya Mori Patent Attorney Yoshiaki Shimizu Patent Attorney Masaaki Shimizu 1st cause

Claims (1)

[Claims] The side protector is an annular elastic body comprising a tire, a rim, and a side protector, and the side protector is an annular elastic body comprising a base part, a protrusion part, and a rim part 7, the base part being sandwiched between a bead part of the tire and a rim flange. When the protruding part is exposed to the axial direction of the sidewall part of the tire, the outer surface of the sidewall part is covered, and the outer edge of the head is close to the shoulder part of the tire. In the tire assembly, the outer surface from the inner four edges of the base portion of the side protector to the outer peripheral side is formed into a curved surface that almost matches the cross-sectional curvature of the inner surface of the rim 7, A protruding seat is provided in a portion close to the upper end of the rim flange between the outer peripheral side of the curved surface and the protruding portion, and the protruding seat is attached to the sidewall portion side of the tire by the upper end of the rim 7 flange. A tire assembly characterized by being configured to be valve-pressured.