CN103085599A - Design method of tire with ultralow flatness ratio and extra-large rim - Google Patents

Abstract

The invention discloses a design method of tire with ultralow flatness ratio and an extra-large rim. The design method comprises the following steps of: firstly, inquiring a technical parameter standard of a design specification, and affirming an inflating external diameter, a section width and a rim dimension parameter of a finished tire; secondly, determining a mould external diameter of the tire, a section width, a tire bead diameter, a bead width and a tread surface width parameter; thirdly, determining tire surface deflection and a pattern ring side plate joint surface parameter, adjusting a tire crown position profile curve, and finishing a tire tread crown curve design and a ring part curve localization; fourthly, determining a rim protection boss lower end point according to the bead diameter of the tire and a width numerical value; and fifthly, determining the width of a design section and the final tire wall outline. The design method provided by the invention fully utilizes extension of the rim protection boss width and tire wall outline form to increase the width of the tire section furthest, so as to meet a standard requirement, achieve reasonable design of tire size, accurately guide a productive process, and can manufacture products with reliable quality.

Description

The tire designing method of ultralow flat ratio and especially big wheel rim

Technical field

The present invention relates to tire manufacturing technology field, be specifically related to the large wheel rim passenger vehicle tyre of a kind of low section method of designing.

Background technology

Present domestic tire just develops very fast towards meridian and inner tube freeization, above-mentioned two processes are completed in the developed country such as American-European and area substantially, and the low flat new direction that changes into the development of world car tire, the needs that it has not only satisfied vehicle high-speed performance and road-holding property have also improved deceleration and stopping performance; Although low-profile tire is Shortcomings aspect noise and travelling comfort,, saving oil consumption more safe and reliable because of it, and be widely used in high-grade automobile, in order to realize tyre flattening, rim diameter is also towards the large scale future development.

Flat ratio is the tire height to width ratio, refers to the ratio that tire section is high and section is wide, and it has determined the profile of tire, is formulated as: and flat ratio=section is high/and section is wide * and 100%.Along with the requirement of vehicular drive performance and more and more higher to the requirement of high-performance tire, the flat ratio of passenger car tire is more and more less, wheel rim is increasing, the specification that ultralow flat ratio and especially big wheel rim have occurred, present minimum flat ratio tire has reached 20%, and maximum motorcar rim has reached 32 inches.Ultralow flat ratio and especially big wheel rim refer generally to rim diameter more than 26 inches, aspect ratio is below 30.

Although the tire of ultralow flat ratio and especially big wheel rim has very large contribution to the lifting of aspect of performance; but during due to ultralow flat ratio tyre inflating, the position, sidewall is expanded less; as shown in Figure 1; according to traditional sidewall profile arc (as the connection lead between pattern ring side plate die joint A and wheel rim protection boss B) and steamboat rim protection boss method of designing; be difficult to reach standard-required on the wide size of section, easily cause the damage of wheel rim after using with the fashionable dress tire.

Summary of the invention

The technical problem to be solved in the present invention is to provide the tire designing method of a kind of ultralow flat ratio and especially big wheel rim; adopt the method can increase to greatest extent the section width of tire; finally produce the standard compliant tire product of physical dimension, provide more protection to wheel rim simultaneously.

For solving the problems of the technologies described above, the present invention adopts following technical scheme: the tire designing method of a kind of ultralow flat ratio and especially big wheel rim is characterized in that: comprise the following steps:

The first step, the technical parameter standard of Query Design specification confirms that finished tire is inflated overall diameter, section is wide and the rim size parameter;

Second step is determined mould overall diameter, section wide region, tyre diameter at rim seat, well width and the tread width parameter of tire according to standard-required;

The 3rd step, determine tyre surface deflection, pattern ring side plate die joint parameter, and adjust crown position profilograph, complete crown position Curve Design and circle section laying-out curve;

In the 4th step, determine wheel rim protection boss lower extreme point according to tyre diameter at rim seat, width numerical value;

In the 5th step, determine the wide and final sidewall profile of design section.

Wherein said boss is large boss.

Further, wheel rim protection boss upper extreme point is connected with straight line with side plate pattern ring die joint.

Extension and sidewall outline line form that method of designing of the present invention takes full advantage of wheel rim protection boss width increase to greatest extent to deflected width of tyre; to satisfy standard-required; realize the rational Design on Plane of tire size; thereby instruct more accurately production process, produce more failure-free product of quality.

Description of drawings

Fig. 1 is the profile schematic diagram of traditional design;

Fig. 2 is the profile schematic diagram that the present invention designs.

In figure: 1 is the crown point, and 2 is the tread surface end points, and 3 is pattern ring side plate die joint, and 4 is one section arc of crown; 5 is two sections arcs of crown, and 6 is three sections arcs of crown, and 7 is that tire chalaza; 8 are wheel rim protection boss, and 9 is the tyre bead portion curve, and 10 is that boss is connected arc with the tyre bead curve.

The specific embodiment

In the present embodiment, with reference to shown in Figure 2, the 305/25R32 specification be example as specific embodiment, its specific design method is as described below:

The first step is inquired about this specifications design standard, according to European ETRTO standard, determines that the technical parameter of 305/25R32 radial tyre of passenger car is: standard rim 11J, inflation overall diameter 965mm, the wide 313mm of inflated section, standard inflation pressure 220kPa;

Second step is determined the Design of Dies size, according to tyre inflating expansion principle, wide up to standard for guaranteeing tyre inflating overall diameter and section, and guarantee assembly performance, determine design overall diameter 956mm, tyre diameter at rim seat 813.2mm, well width 294.64mm, tread width 274.5mm;

The 3rd step, determine the position of crown point 1 according to the Design of Dies overall diameter, determine rule of thumb that again tread surface end points 2 and crown point 1 are vertically 9.61mm apart from (being deflection), pattern ring side plate die joint 3 is 21mm with the vertical distance of crown point 1, three sections arc designs are adopted at the crown position, and one section arc 4 radius of crown are 1700mm, and two sections arc 5 radiuses of crown are 850mm, three sections arc 6 radiuses of crown are 37mm, and pattern ring side plate die joint 3 is 1.5mm with three sections arc 6 transverse distances of crown;

The 4th step, chalaza 7 positions with tyre bead portion curve 9 location according to tire, wherein tyre bead portion curve 9 designs for fixed curve, the standard-required wide according to the tyre inflating section determined wheel rim protection boss 8 positions again, wheel rim protection boss 8 lower extreme points and tire chalaza vertical distance 27mm, transverse distance 12mm, then wheel rim is protected boss 8 lower extreme points and tyre bead portion curve 9 use radiuses is that the boss of 15mm is connected arc 10 and is connected with the tyre bead curve;

The 5th step, according to boss lower extreme point position, determine in vertical direction with 35 degree, width is the boss of 3.5mm, and boss upper extreme point place, definite both sides distance is tyre section width 322.66mm, again the boss upper extreme point is connected with straight line with side plate pattern ring die joint 3, can completes the design of this specification outline.

Below the present invention is described in detail, the above only is the present invention's preferred embodiment, when not limiting the scope of the present invention, namely allly does impartial change and modify according to the application's scope, all should still belong in covering scope of the present invention.

Claims (2)

1. the tire designing method of a ultralow flat ratio and especially big wheel rim is characterized in that: comprise the following steps:

The first step, the technical parameter standard of Query Design specification confirms that finished tire is inflated overall diameter, section is wide and the rim size parameter;

Second step is determined mould overall diameter, section wide region, tyre diameter at rim seat, well width and the tread width parameter of tire according to standard-required;

The 3rd step, determine tyre surface deflection, pattern ring side plate die joint parameter, and adjust crown position profilograph, complete crown position Curve Design and circle section laying-out curve;

In the 4th step, determine wheel rim protection boss lower extreme point according to tyre diameter at rim seat, width numerical value;

In the 5th step, determine the wide and final sidewall profile of design section.

2. the tire designing method of ultralow flat ratio according to claim 1 and especially big wheel rim is characterized in that: wheel rim protection boss upper extreme point is connected with straight line with side plate pattern ring die joint.

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