JPH03262712A - Assembled body of tire and rim - Google Patents

Abstract

PURPOSE:To support the load of a tire when bursting occurs and to prevent a tire from shifting to a side by forming protruded lines on the internal surface of the tire and protrudedly installing a core having a supporting piece on the external peripheral surface of which fitting grooves, which can be protrudingly fitted to the internal surface of a rim. CONSTITUTION:An assembled body 1 comprises a tire T, on the internal surface of which a protrusion 2 is formed and a rim R to the rim body 3 of which a core 5 is fitted. The tire T is fixed to the rim body 3. The core 5 is provided with a supporting piece 7 on the external peripheral surface of which fitting grooves 6 are arranged. To these fitting grooves 6 protruded lines 2 can be fittingly secured. The rim body 3 s provided with a bead seat 21 on which the bead section 13 of the tire T is seated and a flange 22 having a supporting face which receives the outside surface of the bead section 13. When the internal pressure of the tire T is reduced due to bursting, the supporting piece 7 receives the internal surface of the tire T for supporting the load of the tire T. At the same time, the protruded lines 2 and fitting grooves 6 are fitted to each other for preventing the tire T from shifting sideways.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a tire and rim combination that can be particularly suitably applied to motorcycles, enables stable running during banking, etc., and improves running safety. Concerning solids.

[Problems to be solved by conventional techniques and inventions] In recent years,
BACKGROUND ART As vehicle performance and tire performance improve, motorcycles are becoming faster to drive.

However, as is well known, motorcycles are unstable vehicles, unlike four-wheeled vehicles. Therefore, if one tire becomes banked, especially during high-speed driving, the balance of the vehicle will be greatly reduced, and the rim may sometimes come off. There is a high possibility that this will lead to a major fall accident.

The main causes of deterioration of vehicle balance due to such banks are that the rolling radius of the tires changes significantly, and that the center of the banked tires deviates from the center of the rim and moves left and right, causing the running direction of the tires to change sequentially with each rotation of the tires. In recent years, there has been a strong emergence of new models that can maintain the balance of the vehicle body even when banking and drive safely to the stopping position. desired.

The present invention is based on the use of a tire with a protrusion on the inner surface and a rim equipped with a core having a fitting groove that fits into the protrusion when the internal pressure is reduced. The aim is to provide tire and rim assemblies that maintain the same conditions and enable safe driving.

[Means for Solving RMA] To achieve the above object, the tire and rim assembly of the present invention provides a tire in which a protrusion extending in the circumferential direction is formed on the inner surface of the tire, and a bead portion of the tire. The rim body to which the tire is attached is provided with a bead seat on which the bead bottom sits and a flange having a support surface for receiving the outer surface of the bead portion at both ends of the tire in the axial direction. It has an annular shape that extends in the axial direction of the tire and extends continuously or intermittently in the circumferential direction of the tire, and a fitting groove is formed on the outer circumferential surface that extends in the circumferential direction and fits into the protrusion by reducing internal pressure. It is formed from a rim provided with a core with support pieces.

[Operation] The tire and rim assembly constructed in this way has
Since the annular support piece is provided along the inner surface of the tire, the tire load can be supported by the support piece even when the internal pressure of the tire is reduced due to banking, etc., and the required rolling radius of the tire can be maintained.

Moreover, in the supported state, the fitting groove provided on the support piece and the protrusion provided on the inner surface of the tire fit together, preventing the tire from shifting laterally, thereby keeping the running direction of the tire constant. This, in combination with maintaining the necessary rolling radius, can greatly improve straight-line running performance.

In addition, since the tires can absorb lateral forces from the road surface by preventing lateral slippage, it is possible to rebalance the vehicle body and also perform cornering, allowing the vehicle to travel safely and stably without falling over. Furthermore, since there is a gap between the inner surface of the tire and the support piece, the running performance at normal internal pressure is not impaired, and the fitting between the fitting groove and the protrusion prevents the rim from coming off [Example]: An embodiment of the present invention will be described based on the drawings.

In the figure, a tire and rim assembly l is formed from a tire T having a protrusion 2 formed on the inner surface S1 of the tire, and a rim R having a core 5 provided on a rim body 3 to which the tire T is attached. is provided with a support piece 7 having a fitting groove 6 on its outer circumferential surface into which the protrusion 2 can be fitted.

The tire T includes a trend part 11, a pair of sidewall parts 12 extending inward in the tire radial direction from both ends of the trend part 11, and a bead part 3 located at the inner end in the tire radial direction of each sidewall part 12. In this example, the tire is for a motorcycle, and the aspect ratio SH/W, which is the ratio of the tire cross-sectional height SH to the tire cross-sectional height SH, is set to 0.55 or less.

In addition, between the bead cores 14 provided in the bead portions 13, a carcass 16 in the shape of a 10-idal is passed through the sidewall portion 12 and the tread portion 11, and the carcass 16
Bell) 1i along the carcass 16 on the outside of the tire radius
17 is wound in the tire circumferential direction.

The trend portion 11 is formed on the crown of the carcass 16, curved in a substantially car-arc shape along the contour thereof, and having a tread width TW close to W in the cross section of the tire, thereby improving the turning characteristics. camber thrust during turning is maintained.

The carcass 16 is formed of one or more carcass plies, in this example, one carcass ply, which has a carcass cord inclined by 11J at an angle of 70 to 90'' with respect to the tire equator, and both ends of the carcass ply extend around the bead core 14 from the inside. folded outwards.

In addition, the belt layer 17 has a belt cord that is aligned with the tire equator.
It consists of a plurality of belt briais arranged at an angle of ~30°, and the belt plies are arranged in different directions so that the belt hoods intersect with each other between the briais. Therefore, the belt layer 17 can constitute a strong truss structure by the belt cords and carcass cords crossing each other, and the belt layer 17 has an aspect ratio of 0.55 or less to firmly tighten the carcass 16 and improve tire rigidity. It can be greatly improved.

In addition, in this example, the tire T has a bead width BW, which is the maximum distance between the outer edges of the bead portions 13 in the tire axial direction, which is larger than the tire cross-section width W, thereby further increasing the tire lateral rigidity as well as the aforementioned high aspect ratio. In this way, since the tire T has an external profile with high tire rigidity, especially tire lateral rigidity, the carcass 16 and belt layer 1 have low rigidity.
7 can be used, and in this example, the number of carcass plies and belt braises used can be reduced, and the weight of the tire can be reduced.

The carcass [6] of the tire T is covered with an inner liner 19 made of highly airtight rubber, and on the inner surface S1 of the inner liner 19, in this example, the carcass is located on the tire equator and continuous in the circumferential direction. A projecting rim 2 is integrally provided.

In this example, the protrusion 2 is formed from a rubber paraboloid having a triangular cross section, and its apex is arranged toward the center of the radius of curvature RT of the inner surface S1.

Further, the protrusion 2 has a protrusion height PH that is 0.05 times or more and 0.15 times or less of the tire cross-sectional height SH, and the angle θ between the apex portions is set to be 70° or more and 120° or less. be done.

Then, such a tire T is assembled into a rim R consisting of a rim body 3 and a core 5.

The rim body 3 includes a bead seat 21 on which the bead bottom of the bead portion 13 is seated, and a flange 22 having a support surface that receives the outer surface of the bead portion 13 at both ends in the tire axial direction. The inner edges in the axial direction of the tire are connected via a hump 23 and a well portion 24 . Note that the rim width HW, which is the distance between the outer edges of the bead seat 21 in the tire axial direction, is set equal to the bead width BW.

Further, the support surface of the flange 22 is connected to the bead seat 21.
The flange width FW, which is the distance between the upper edges of the support surface, is 1/1/1 of the rim width HW.
It is set to 1.05 times or more and less than 1 time. This allows the bead portion 13, which serves as the lower edge, to be firmly seated and attached in accordance with the external shape of the bead portion 13.

Further, a mounting piece 25 is provided in the well portion 24 of the rim main body 3 to protrude from the tire equatorial plane and extends outward in the tire radial direction, and the core 5 is fixed to the rim body 3 via the mounting piece 25.

The core 5 has a wing-like shape on the outer end of the base piece 26 attached to the mounting piece 25, which curves and extends in the tire axial direction substantially along the inner surface S1 and with a gap from the inner surface S1, and in this example, has a wing shape that extends in the tire axial direction. It includes an annular support piece 7 that is continuous in the circumferential direction. Note that the support pieces 7 may be arranged intermittently in the tire circumferential direction.

Further, the support piece 7 has a V-shaped fitting groove 6 recessed on its outer circumferential surface 7S and at a position close to the protrusion 2, which extends in the circumferential direction and can be fitted to the protrusion 2 by reducing internal pressure. be done.

Therefore, when the internal pressure of the special puncture tire decreases, the core 5 receives the inner surface Sl by the support piece 7 and maintains the rolling radius of the tire within the range necessary for running by supporting the tire load. Furthermore, when the internal pressure decreases, the protrusions 2 and the fitting grooves 6 fit together, thereby preventing the bank tire from shifting laterally, keeping the running direction of the bif tire constant, and preventing the rim from coming off. In addition, it can support lateral forces from the road surface, improving turning characteristics and making it easier to restore the balance of the vehicle body, thereby greatly improving driving performance when internal pressure decreases and increasing driving safety.

As mentioned above, the tire T has a high flat profile and a large beat width BW, so it has high lateral rigidity, and therefore prevents lateral displacement of the punctured tire until the inner surface S1 and the support piece 7 come into contact during banking, etc. It can be suppressed. In addition, at normal internal pressure, the tire rigidity is high and the amount of deflection upon contact with the ground is small, so the support piece 7 can be placed close to the inner surface S1, and this allows the inner surface S to be
It is possible to shorten the running time until the support piece 1 and the support piece 7 come into contact with each other, thereby improving running stability.

Further, in this example, in the support piece 7, the radius of curvature R of the outer circumferential surface 7S is 0.8 times or more and 1.0 times or less the radius of curvature RT of the inner surface S1, and the support piece height of the support piece 7 is The height H is 0.5 times or more the inner surface height TH of the inner surface S1 and 0.
It is set to 8 times or less.

In addition, the support piece middle RW, which is the distance between the outer ends of the support pieces 7, is set to be 0.3 times or more and 0.7 times or less than the trend width TW, and the groove depth RH of the fitting groove 6 is set to the above-mentioned trend width TW. The height PH of the protrusion 2 is set to be 0.8 times or more and 1°0 times or less.

Note that when the radius of curvature R is less than 0.8 R7, the inner surface Sl comes into local contact with the support piece 7 during bank running, which tends to cause tire damage, and conversely, when the radius of curvature R is larger than the radius of curvature RT, the inner surface Sl contacts the support piece 7 outside. The end abuts against the inner surface Sl, causing damage as well.

Further, when the support piece height H is less than 0.57 H, the rolling radius becomes too small, making it impossible to maintain stable running and inducing structural failure of the tire. On the other hand, when the pressure is greater than 0.87 H, the support piece 7 and the inner surface S1 come into contact with each other when the tire is running at the normal internal pressure, resulting in a decrease in ground running performance that may cause tire damage.

Also, when the support piece width RW is less than 0.3TW, the amount of support by the support piece 7 becomes too small, impairing turning performance, and when it exceeds 0.77W, it becomes unnecessary because it exceeds the maximum bank angle when turning. .

Also, when the groove depth RH is less than 0.8 PH, it is easy to come off from the fitting groove 6 due to dynamic vibrations during running, and conversely, the protrusion height P
When it is larger than H, the tire tends to shift laterally.

Also, when the included angle θ is 70°, it is difficult to fit into the fitting groove 6, and when it exceeds 120°, the fitting groove 6 cannot support lateral forces etc.
The problem of getting out of the room is likely to occur.

In the present invention, the protrusions 2 may be formed intermittently along the circumferential direction, or may be formed in multiple forms.

Note that such a tire and rim assembly can be suitably employed not only in motorcycles but also in four-wheeled vehicles.

C Effects of the Invention] The tire and rim assembly of the present invention, like the ridges, has protrusions extending in the circumferential direction on the inner surface of the tire, and on the rim,
Since the core is equipped with a fitting groove that can fit into the protrusion and a support piece that runs along the inner surface of the tire, the running performance can be greatly improved in the event of a decrease in internal pressure due to a puncture, resulting in safe driving. is possible.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing one embodiment of the present invention, and FIG. 2 is a sectional view showing an enlarged bead portion. 2- protrusion, 3-- rim body, 5- core, 6-...
Fitting groove, 7...support piece, 13...bead portion, 21...bead seat, 22-flange, R-...
-Rim, Sl-・-Inner surface, T-Tire.

Claims (1)

[Claims] 1. A tire that has a protrusion extending in the circumferential direction on the inner surface of the tire, a bead seat on which the bead bottom of the bead portion of the tire is seated, and a flange that has a support surface that receives the outer surface of the bead portion in the axial direction of the tire. The rim body to which the tire is attached by being provided at both ends has an annular shape that extends in the axial direction of the tire along the inner surface of the tire and with a gap from the inner surface, and that extends continuously or intermittently in the circumferential direction of the tire, and that has an annular shape on the outer periphery. A tire and rim assembly comprising a rim provided with a core having a supporting piece on its surface that extends in the circumferential direction and has a fitting groove that fits into the protrusion when internal pressure is reduced.