BG61716B1 - Pneumatic tyre for agricultural purposes - Google Patents

Abstract

The pneumatic tyre has a design reducing the deformation inthe bead zone, the larger protrusion in the central part of theprofile, the soil packing along the tyre equator and the formationof deep ruts. The tyre has a tread, carcass of textile cord, sidesand bead. The width of profile (1) is from 145 to 165 mm, and itsheight (2) is from 150 to 170 mm. The outer diameter (3) is from710 to 740 mm, the width of casing (4) is from 120 to 160 mm, andthe distance between the toes of the bead (5) is from 110 to 140mm. The radius of the casing (6) is from 135 to 195 mm, and thaton the side part (7) is from 200 to 240 mm, and the radius of thetyre bead is from 10 to 20 mm. The depth (9) of the central grooveis from 14 to 20 mm, and the crown of casing (10) is from 12 to 22mm. The ratio between height (2) and the width of profile (1) is1,00-1.055, between the width of casing (4) and profile (1) is0.880-0.920 and the distance between the toes of the bead and thewidth of profile (1) is 0.800-0.850. The ratio between the crownof casing (10) and the width of profile (1) is 0.100-0.130, and toits height is 0.100-0.120.

Description

Field of the art

The invention relates to an outer pneumatic tire intended for agricultural purposes.

State of the art

An external pneumatic tire is known which comprises the following basic elements, such as a tread, textile casing, side and brace, with the following basic ratios of its geometric parameters (1): height 2 to the width of the profile 1-1,113; shoe width 4 to profile width 1-0,859; a distance between the heels of the bead 5 to the width of the profile 1-0,718; shoe of shoe 10 to profile width 1-0,089; shoe 10 to profile height -0.080.

The drawbacks of the above-mentioned tire construction are the large deformation in the abrading bumper area and the small contact area, which creates preconditions for soil compaction and the formation of deep tracks.

Technical nature

The object of the invention is to create an external pneumatic tire for agricultural machines to eliminate the aforementioned disadvantages without worsening the other performance and characteristics of the tire. An outer pneumatic tire for agricultural machines is constructed comprising the following main elements - a tread, a textile casing, pages, a brace in which the ratios of the geometric parameters are as follows: profile height 2 to profile width 1 is from 1.00 to 1 , 05, the shoe of the sole 10 to the width of the profile 1 - from 0.100 to 0.130, the shoe of the sole 10 to a height of the profile 1 - from 0.100 to 0.120, wherein according to the invention, the widths of the sole 4 to the width of the profile 1 is 0.880 to 0.920, a distance between the heels of the bead 5 to the width of the Profile 1 - from 0.800 to 0.850.

The reduction in profile height 2 increases the tire's lateral stiffness and deformation, which is particularly important in relation to the low internal pressure in this type of tire.

The upright tire wall (less curvature) helps to evenly distribute the stresses on the page, reduce the deformation and heat build-up in the tire's bump zone. The greater width of the sole 4 increases the contact area, which achieves a more uniform pressure distribution in the contact area and reduces the negative impact of the tire on the soil. The increased ratio of the distance between the heels of the bead 5 to the width of the profile 1 reduces the curvature of the inner contour of the tire, which facilitates the placement of the vulcanization diaphragm in the tire during the vulcanization process, thereby reducing the prerequisites for production defects.

Description of the attached figures

Figure 1 is a cross-sectional view of a tire;

FIG. 2 is a cross-sectional view of a tire of the present invention (dashed) imposed on a cross-sectional view of a classic type (solid line) tire.

Examples of implementation

The invention is illustrated by the following example.

External pneumatic tire with profile width of 1-154 mm, profile height 2160 mm, outer diameter 3-725 mm, width of the foot 4-140 mm, distance between heels 5-128 mm and radius describing the foot 6-145 mt. The side of the profile is described with a radius of 7-220 mm with a center lying on the horizontal axis passing through the widest section of the profile.

The radius describing the tire crash 8 is 14 m. The tire profile has a center line depth of 9-18 mm and a foot boom of 10-18 mm.

The basic ratios of the geometric tire parameters of the tire according to the invention are: height 2 to the profile width is 1.0389; width of sole 4 to profile width 1 - 0.909; a distance between the heels of the bead 5 to the profile width 1 of 0.831; shoe of shoe 10 to profile width 1 - 0.1285; foot shoe 10 to profile height 2-0, 1125.

Claims (1)

Claims External pneumatic tire for agricultural machinery containing the main elements - tread, textile cord frame, sides, side, in which the ratios of the geometric parameters are as follows: height (2) to profile width (1) from 1.00 to 1.05 , the sole of the sole (10) to the width of the profile (1) is from 0.100 to 0.130, the arrow of the sole (10) to the height of the profile (1) is 5 from 0.100 to 0.120, characterized in that the ratio of the width of the sole (4) to the width of the profile (1) is from 0.880 to 0.920 and the distance between the heels on the board (5) to the width of the profile (1) is from 0.800 to 0.850.