Prevent the bead structure that inner tube of a tyre off-the-road tyre is arranged of tyre bead transposition
Technical field
The utility model relates to tire, specifically is the bead structure that inner tube of a tyre off-the-road tyre is arranged that prevents the tyre bead transposition.
Background technology
The air pressure of off-the-road tyre is lower; It is more serious to overload, and squeegee action is bigger, and this type of tire all is in the mine usually or other building-site uses; Road conditions are complicated abominable; Need bear huge moment of torsion when road conditions such as tip and hard objects such as rock are many, ditch is many, sloping Lu Duo make the tire normal operation, bad if tire cooperates with wheel rim, often cause between tire and the wheel rim transposition takes place and bead chafing appears, the rim of the mouth is quick-fried and tire infantile failure such as bead part tyre cavity fracture.
Many in the past tires producer produces the tire transposition for off-the-road tyre is unlikely when transmitting powerful tractive force; Often adopt the mode of big interference fit, the powerful friction force that produces by the big compression modulus between bead base and the wheel rim comes transferring power and suppresses the tire transposition.But this mode can be brought the adverse effect of following several respects: 1) cause the powerful interference loss of bead coil, cause cost to improve for guaranteeing the powerful steel wire quantity that increases of tyre bead; 2) owing to the huge friction force inhibition of bead base, thereby the outside contact pressure minimizing with wheel rim of tyre bead also diminishes the friction force at this position thereupon, the partial offset total frictional force; 3) big interference fit influences the comfort feature and the handling labor efficient of tire loading and unloading greatly.
The utility model content
The purpose of the utility model is will provide a kind of to be installed on 5 ° of wheel rims; Easy to loading and unloading; And can effectively prevent the bead structure of the off-the-road tyre that the inner tube of a tyre is arranged of tyre bead transposition; This structure can effectively suppress tire when under high load capacity, going, and tyre bead rushes at the distortion of tire lateral outer side and the circumferential rotation displacement of wheel rim relatively, avoids contacts site such as tyre bead portion and rim flange, bottom that wearing and tearing take place and causes early stage tyre bead damage.
The technical scheme that realizes the utility model purpose is:
Dr is littler than wheel rim nominal diameter D for this tire bead structure bead base diameter, and guaranteeing has closely cooperating of appropriateness between tyre and rim, makes each position contact pressure rationally, evenly.The bead base angle mainly is to make things convenient for tire one side tyre bead to put into wheel rim easily than little with 5 ° of wheel rim mating surfaces angles, and the opposite side tyre bead is gone in a rim under the dismounting and a side pressure of bead seat, accomplishes the installation of tire and wheel rim together.
Described bead base diameter Dr is than the little 1mm of wheel rim nominal diameter D;
Described bead base angle ratio and 5 ° little 1 ° of wheel rim mating surfaces angle.
The utility model has the advantages that: adopt the bead base structure design of this utility model, can change tyre bead interior shape and outside tires additive incrementation reinforcement.Main reasonable cooperation through bead part and wheel rim; In the time of can effectively suppressing to go under the tire high load capacity; Bead part is to the distortion of tire lateral outer side and the circumferential rotation displacement of wheel rim relatively, avoids contacts site such as tyre bead portion and rim flange, bottom that wearing and tearing take place and causes early stage tyre bead damage.
Description of drawings
Fig. 1 is the utility model bead structure scheme drawing.
Among the figure: 1. bead base 2. wheel rims 3. bead base diameter Dr 4. wheel rim nominal diameter D.
The specific embodiment
During tire design, bead base diameter Dr3 is littler than wheel rim nominal diameter D4, and D-Dr is 1mm.Tyre bead bottom surface angle is than little with 5 ° of wheel rim mating surfaces angles, and value is 4 °.
This kind air-inflation tyre can be assemblied in the above standard rim of 24in, has the carcass of symmetrical tyre bead portion.Can guarantee has closely cooperating of appropriateness between tyre and rim, make each position contact pressure rationally, evenly.The bead base angle mainly is to make things convenient for tire one side tyre bead to put into wheel rim easily than little with 5 ° of wheel rim mating surfaces angles, and the opposite side tyre bead is gone in a rim under the dismounting and a side pressure of bead seat, accomplishes the installation of tire and wheel rim together.