CN100343083C

CN100343083C - Tyre mounted on rim

Info

Publication number: CN100343083C
Application number: CNB2004100868773A
Authority: CN
Inventors: K·K·小邦帕斯; J·P·加列戈
Original assignee: Michelin Recherche et Technique SA France; Societe de Technologie Michelin SAS
Current assignee: Michelin Recherche et Technique SA Switzerland; Compagnie Generale des Etablissements Michelin SCA
Priority date: 1999-10-18
Filing date: 1999-10-18
Publication date: 2007-10-17
Anticipated expiration: 2019-10-18
Also published as: CN1616263A

Abstract

The present invention relates to a tyre which is arranged on a wheel rim and is provided with a tapered seat about 15 degrees. The tyre is provided with two tyre flanges, both sides of an equatorial plane are respectively provided with one tyre flange, and each tyre flange is provided with a fundamental truncation conical seat surface and an inner surface, wherein the seat surface and the inner surface are crossed at a transition point. The transition point contained by the present invention is positioned at an axial distance which is from the equatorial plane and is 0.78 times of the axial distance of a seat point from the equatorial plane and is smaller than or equal to the axial distance of the seat point from the equatorial plane.

Description

A kind of tire that is installed on the wheel rim

The application is to be 1999-10-18 the applying date, and application number is 99814604.8, and denomination of invention is divided an application for the patent of invention of " have the tire of circular tire toe and make the mould of this tire of taking turns ".

Technical field

The present invention relates to be used for the tire of heavy-load transport vehicles, for example, the tire of truck and city motor bus.Particularly, the present invention relates to the heavy duty tire of tire toe (bead toe), the shape of tire toe can be improved durability, in interim easy dismounting in the service life of tire with reinstall.

Background technology

Tyre bead is the part of tire in conjunction with wheel rim.Tyre bead generally comprises a flat surface that defines a core pattern, and it is complementary with the disappointed seat of wheel and maybe tire can be fixed on the wheel rim with the power of transmitting bead core.The tyre bead seat surface constitutes a gas seal member so that pressurized air is retained in the tire.In the truck and bus tyre of routine, tyre bead ends at a leg-of-mutton tire toe that stretches to the tire S. A. from tyre bead coil pipe or bead core.

Tire toe with the truck and the bus tyre of 15 ° of deep trouths (drop center) wheel rim generally has a lengthening it is believed that it helps the disengaging that is fixed on tyre bead on the wheel rim seat and in use helps to stop tyre bead.In addition, the tire toe of lengthening it is believed that the globality that helps to guarantee gas seal member.Yet the tire toe of lengthening can hinder and tyre bead is installed on wheel rim or dismantles from wheel rim, and the action of dismounting tire comprises makes the tire toe climb over wheel rim.

Truck and bus tyre design and manufacture to have the service life that heavy carcass (carcass) can prolong tyre surface (tread).The vehicle operation person handles this tire usually again to obtain optimum value from this carcass.For example, a kind of tow truck of length may carry out three to four times and handle again, and this needs the dismounting of as much number of times and reinstalls.

In addition, tire in its life cycle since the road surface cause the badly damaged place under repair of carcass also need the dismounting.

A problem of Assembly ﹠Disassembly tire is that tyre bead climbs over wheel rim, and very big stress is added on tyre bead and the tire toe.Because the aging and rubber of tire is owing to oxidation becomes fragile, this stress may damage the tire toe.If serious, the useful life longevity of carcass can be shortened or finish to this damage.

Summary of the invention

The invention provides a kind of difform new bead part, with conventional tire mutually specific energy remove a big chunk in the tire toe and do not sacrifice the globality that tire bead is installed.

In order to achieve the above object, the invention provides a kind of tire that is installed on the wheel rim, one 15 ° cone seat is arranged, described tire has two tyre beads, tyre bead of the every side of equatorial plane, each tyre bead has a Frusto-conical seat surface, the end surfaces of inside face and curve, this seat surface and end surfaces intersect at a point of transition, it is characterized in that: described end surfaces has from seat surface and carries out the round-shaped of transition to inside face, this point of transition is a tire seat point apart from 0.78 times of the axial distance of equatorial plane apart from the axial distance of equatorial plane at least, and is not more than the axial distance from equatorial plane to the bead core center.

In other words, the invention provides a kind of tire that is installed on the wheel rim, cone seat with one 15 °, described tire has two tyre beads, tyre bead of the every side of equatorial plane, each tyre bead has a Frusto-conical seat surface, inside face and end surfaces, this seat surface and end surfaces intersect at a point of transition, this end surfaces is round-shaped to form a transition from the seat surface to the inside face, it is the angle on summit with the point of transition that this seat surface and end surfaces define one, and the scope of this angle is 105 °-150 °.

According to the present invention, be installed in a tire on the wheel rim, the bead seat at about 15 ° of angles is arranged, promptly the tire of truck or city motor bus is compared the circular tire toe that a butt is arranged with conventional tire toe.This tire toe is limited by the inside face of tyre bead seat surface and bead part according to the present invention, and this tyre bead seat surface limits one 105 °-150 ° angle, preferably one 130 °-150 ° angle.

According to another aspect of the present invention, the seat surface of this tyre bead ends at a point of transition, this point of transition is with respect to the equatorial plane of tire, is positioned at 0.78 times that is not less than from the axial distance of this point of equatorial plane, when tire is installed in that this point is positioned on the suitable wheel rim.

In accordance with a further aspect of the present invention, this point of transition is positioned at from 0.95-0.97 times of scope of centre of gration seat point radial distance, when mounting of tyre is on wheel rim with respect to the radial distance that selects centre of gration of this tire.

According to a kind of mould of the present invention, comprise that has conical burr (ridge) bead ring, this taper shape burr comprises a bead seat that forms a face and a diaphragm guiding surface. this taper shape burr guides this mould diaphragm from the equatorial plane that bends towards tire radially is set.Form an angle from this taper shape burr this diaphragm that stretches and the bead seat that forms this face, scope is 105 °-155 °, preferably 130 °-150 °, and to constitute the tire toe of a circle.

Description of drawings

Present invention is described below in conjunction with accompanying drawing, and the present invention will better be understood, wherein:

Fig. 1 is the section drawing according to tire bead of the present invention;

Fig. 2 is mounted in the section drawing of the tire bead of the Fig. 1 on the wheel rim;

Fig. 3 is mounted in the section drawing of the conventional tire tyre bead on the wheel rim;

Fig. 4 is the partial cross section figure according to mould of the present invention.

The specific embodiment

Fig. 1 shows a kind of heavy duty tire, for example the cross section of the bead part of city motor bus or truck tyre.The outside face 20 and the inside face 22 of this tire provide reference orientation.Bead part comprises a bead core 24, and it is that steel wire coil pipe by an oblong section constitutes in illustrated embodiment.As known in the art, other shapes comprise avettely and circular, also can be used as bead core.

With reference to figure 2, this bead part is installed on the wheel rim 50.Tension force on the bead core 24 passes to wheel rim by the rubber between compression bead core 24 and the wheel rim seat 52, so that tyre bead is fixed in this wheel rim, and thereby this tire is fixed in wheel rim.Bead part has the tyre bead seat surface 26 of a flat pattern district wheel rim, combines with the wheel rim seat 52 of this wheel rim 50.One consistent with standard bench mark S on this wheel rim near near the reference seat point the outer end of seat surface 26 28.The standard size of having published wheel rim in view of this in the year of the Tire and Rim Association, Inc., wherein, bench mark S be positioned at standard rim diameter and width wheel rim a bit.When tire suitably was installed on the wheel rim, seat point 28 and some S overlapped basically.As shown in Figure 1, in fact seat point 28 is not positioned on the tire bead; Yet this point is easy to be discerned by the insider, and is used in usually in the specific installation diameter and width of tire.

Wheel rim 50 shown in Fig. 2 shows its radius R and a half width X rather than its diameter and width.Wheel rim seat 52 forms a frusto-conical portion with respect to the S. A. A-A of wheel rim.Wheel rim seat 52 forms one 15 ° seat angle 56 with respect to S. A. A-A.One 15 ° seat angle is used for the wheel rim of heavy-duty vehicle, as the wheel rim of truck and city motor bus.

Tire bead seat surface 26 ends at the point of transition 30 of expression point of transition, arrives the inside face 22 of lower tire side wall away from seat surface 26 at the end face 32 of this tyre bead curved surface.As Fig. 1 and Fig. 2 finding, end surfaces 32 has 22 transition regions that form from seat surface 26 to tire inner surface of a circle.

By contrast, Fig. 3 tyre bead 80 that a routine is shown is installed on the wheel rim 50.The bead seat 82 relative length of this routine tyre bead also end at a triangle tire toe 84.It is very general in the industry that the tyre bead of this triangle tire toe is arranged, and can guarantee to form suitable gas seal member because it is believed that the bead seat 82 of this lengthening.In addition, the bead seat 82 of this lengthening under bead core 86 it is believed that the tyre bead that helps to make on the wheel rim is stable and help to resist the vehicle power that run into of wheel under steam in rotation.

Conventional tyre bead 80 runs into a problem in mounting of tyre and dismounting.As Fig. 3 finding, wheel rim 50 comprises a so-called deep trouth (drop center) or caves in 54.When mounted, a side of tire will be crossed wheel rim 58 and is positioned at depression 54.Wheel rim 58 is crossed in the outside of tire then.This tire is inflated then tyre bead is seated on the wheel rim seat 5.Need finish opposite action during remove a tyre.

Making tyre bead cross wheel rim needs a kind of instrument that makes bead distortion, with reverse, crooked and stretching, to produce enough gaps.The triangle tire toe 84 of this lengthening will be crossed 580 fens difficulties of wheel rim, even use instrument.In addition, being applied to the action of the instrument on the tyre bead and power can tire toe, particularly used tire by wheel rim, and rubber becomes fragile because of aging.The less rubber of this elasticity can chap or break.The tire toe that breaks can make tyre bead expose, or bead seat loses globality, or tire is become can not use.

The contriver finds, can make tire bead in place securely and gas seal member is provided with circular tire toe, and this has just eliminated the problem of conventional tire toe.Short tire toe is easy to cross wheel rim, needs less distortion, thereby also suffers less destruction.In addition, according to tyre bead needs less material of the present invention, thereby weight is lighter, and manufacturing cost is lower.

With reference to figure 1, a kind of tire bead according to the present invention has a tire toe again, and this tire toe comprises a seat surface 26 that ends at point of transition 30 and be connected in end surfaces 32.An angle 36 that is formed by seat surface and T line, the starting point of T line are at point of transition 30 and tangent with end surfaces 32, and the scope of this angle is between 105 °-150 °.This angle is in the directional survey that comprises the tire toe.Preferably this angle is in 130 °-150 ° scope.

With reference to figure 2, tire toe of the present invention is limited by the position with respect to the point of transition 30 of the seat point 28 of tire or wheel rim seat point S.The Z-Z line is represented equatorial plane, i.e. the center of the center of wheel rim and the tire installed along S. A. A-A.The nominal radius of wheel rim is measured from S. A. A-A.The axial distance X of seat point S is half of nominal width, and measures from the line of centers Z-Z of wheel rim.The concrete size of the nominal width of wheel rim and diameter is delivered in its yearbook by the Tire and Rim Association, Inc..

The wheel rim seat point S of the wheel rim of each standard and tire mounted thereto is defined, and promptly distance R and X can calculate and be used as benchmark from normal data.According to the present invention, when tire was positioned at the radial distance P of 0.95R-0.97R with the tire seat point 28 that coincides with wheel rim seat point S, point of transition 30 was positioned with respect to wheel rim seat point S.Should be understood that this tire has two tyre beads, coincide with benchmark wheel rim seat point S that this tire will be positioned if this tire is installed on the wheel rim for each tire seat point 28.In fact this finish on suitable wheel rim at this mounting of tyre, or finish with the instrument that can set up suitable tyre bead position.

In addition, point of transition 30 is at the axial distance Y of 0.78X.Preferably point of transition 30 at the center shaft of bead core 24 to inwards.Certainly, point of transition 30 can not from the tire center greater than the axial distance of the distance of seat point S or seat point 28.

Can be with a kind of mould-manufacturing that is particularly suitable for forming the tire toe according to tire of the present invention.Fig. 4 is the section drawing of the mould simplified of representative a kind of height according to the present invention.This mould comprises a diaphragm 100, the fluid filled of this diaphragm 100 usefulness heating, and this fluid is given inside tires with pressure and transfer of heat.The end 102 of diaphragm 100 is sandwiched in upper filmboard board 104 and the lower filmboard board 106.Last bead ring 110 and following bead ring 112, upside wallboard 114 and downside wallboard 116 and tread rings 118,120 are installed in the mould to constitute the outside of tire.One is present in 90 li in the space that limited between diaphragm 100 and bead ring, sidewall paneling and the tread rings at sulfureted tire in the mould.

Each comprises a circular cone burr 124 bead ring 110,112, and its limits one and has the seat surface 130 of bead seat shape and the guide surface 132 of a guiding diaphragm 100.The tire toe that the point of diaphragm 100 around seat surface 130 ends stretches with moulding of tyres along guide surface 132.This point of seat surface 130 ends consistent with the point of transition of tire tire toe (seeing Fig. 1 and Fig. 2).Conical burr 124 guarantees that the point of transition 30 of tire bead suitably locatees.Guide surface 132 is sent to equatorial plane bending to tire with diaphragm 100 from the horizontality of pinching end, thereby limits one 105 °-155 ° angle, preferably 130 °-150 ° separately the time from conical burr (ridge) when seat surface 130 and diaphragm 100.Thereby the angle between seat surface 130 and the guide surface 132 is between 30 °-95 °.The fluid pressure of diaphragm inboard makes diaphragm crooked and consistent with the inside face of tire around tire bead.

Mould according to the present invention provides a sulfuration preferably for the tire toe, has eliminated the space in the mould.Rubber is inflow space at first, and thereby at molded mold pressing tyre bead and give tyre bead with transfer of heat equably equably in early days.

The present invention is described with preferable principle, preferred embodiment, preferred construction.Yet the insider will be appreciated that enforcement of the present invention is not limited to described embodiment, can make various variations and replacement and does not exceed the spirit and scope of the present invention defined by the claims.

Claims

1. tire that is installed on the wheel rim, one 15 ° cone seat is arranged, described tire has two tyre beads, tyre bead of the every side of equatorial plane, each tyre bead has a Frusto-conical seat surface, the end surfaces of inside face and curve, this seat surface and end surfaces intersect at a point of transition, it is characterized in that: described end surfaces has from seat surface and carries out the round-shaped of transition to inside face, this point of transition is a tire seat point apart from 0.78 times of the axial distance of equatorial plane apart from the axial distance of equatorial plane at least, and is not more than the axial distance from equatorial plane to the bead core center.

2. tire according to claim 1 is characterized in that: it is from the 0.95-0.97 of the radial distance of the centre of gration of this tire seat point doubly that this point of transition is positioned at from the radial distance of the centre of gration of this tire.

3. tire according to claim 1 is characterized in that: this seat surface and inside face form the angle that the summit is a point of transition, and the scope of angle is 105 °-150 °.

4. tire according to claim 3 is characterized in that: the angular range that forms between this seat surface and this inside face is 130 °-150 °.