阅读说明：本技术 一种含新型结构的全钢载重工程机械子午线轮胎 (All-steel load-carrying engineering machinery radial tire with novel structure ) 是由 吴学斌 宋喜政 安超 于 2021-02-04 设计创作，主要内容包括：本发明涉及非公路型全钢载重工程机械子午线轮胎,该新型结构的带束层结构由5层钢丝帘布组成,第一层钢丝帘布层贴排列在胎体上,其与轮胎胎面中心线之间的夹角为23±1°,第二层钢丝帘布层贴排列在第一层钢丝帘布上,其与轮胎胎面中心线之间的夹角为17±1°,第三层钢丝帘布和第四层钢丝帘布采用与轮胎胎面中心线之间的夹角为0°的方式依次周向层贴排列在第二层钢丝帘布上,第五层钢丝帘布层贴排列在第四层0度钢丝帘布上,其与轮胎胎面中心线之间的夹角为40±1°。与现有技术相比,本发明结构可以有效缓解轮胎重载状态下长期曲饶变形后造成轮胎的形变,而带来的轮胎生热大产生的肩空和冠空等病象。(The invention relates to an off-road all-steel radial tire for load-carrying engineering machinery, wherein a belt ply structure with a novel structure comprises 5 layers of wire cord fabrics, a first layer of wire cord fabric is attached and arranged on a tire body, the included angle between the first layer of wire cord fabric and the central line of the tire tread of the tire is 23 +/-1 degrees, a second layer of wire cord fabric is attached and arranged on the first layer of wire cord fabric, the included angle between the second layer of wire cord fabric and the central line of the tire tread of the tire is 17 +/-1 degrees, a third layer of wire cord fabric and a fourth layer of wire cord fabric are sequentially and circumferentially attached and arranged on the second layer of wire cord fabric in a mode that the included angle between the third layer of wire cord fabric and the central line of the tire tread of the tire is 0 degree, and a fifth layer of wire cord fabric is. Compared with the prior art, the structure of the invention can effectively relieve the deformation of the tire caused by long-term bending deformation under the heavy load state of the tire, and the symptoms of shoulder hollows, crown hollows and the like caused by large tire heat generation.)

1. The utility model provides an all steel load engineering machinery radial tire that contains novel structure, its characterized in that, the belted layer structure of this tire comprises 5 layers of wire cord fabric, the first layer wire cord fabric is arranged on the matrix, its contained angle with tire tread central line is 23 + -1, the second layer wire cord fabric layer pastes and arranges on the first layer wire cord fabric, its contained angle with tire tread central line is 17 + -1, the third layer wire cord fabric and the fourth layer wire cord fabric adopt and arrange on the second layer wire cord fabric in proper order with the mode that the contained angle between the tire tread central line is 0, the fifth layer wire cord fabric layer pastes and arranges on the fourth layer 0 wire cord fabric, its contained angle with the tire tread central line is 40 + -1.

2. The all-steel heavy-duty engineering machinery radial tire with the novel structure as claimed in claim 1, wherein the first layer of steel cord fabric and the second layer of steel cord fabric are arranged in opposite directions with respect to the included angle between the tire tread center line.

3. The all-steel radial truck tire of claim 1, wherein the third layer of wire-ply fabric and the fourth layer of wire-ply fabric are sequentially arranged on the second layer of wire-ply fabric in a circumferential laminating manner with an included angle of 0 degree with the centerline of the tire tread.

4. The all-steel heavy-duty engineering machinery radial tire with the novel structure as claimed in claim 1, wherein the included angles between the fifth layer of steel cord fabric and the tire tread centerline are set in opposite directions.

5. The all-steel heavy-duty engineering machinery radial tire with the novel structure as claimed in claim 1, wherein the third layer of wire cord fabric and the fourth layer of wire cord fabric are arranged circumferentially between the second layer of wire cord fabric and the fifth layer of wire cord fabric in a manner of having the same width and forming an included angle of 0 ° with the centerline of the tire tread.

6. The all-steel heavy-duty engineering machinery radial tire with a novel structure as claimed in claim 1 or 5, wherein the third layer steel cord fabric and the fourth layer steel cord fabric are high elongation cords, and have a density of 45 cords/100 mm, a thickness of 2.2mm and a width of 252 mm.

7. The all-steel radial tire for heavy-duty engineering machinery with novel structure as claimed in claim 1, wherein said first layer of steel cord fabric is made of steel cord fabric with ultra high strength of 3+9+15 x 0.225HT, and the density is 48/100 mm steel wires.

8. The all-steel radial truck tire according to claim 1, wherein said fifth layer of wire-covered fabric is a 3 x 7 x 0.20HE wire-covered fabric with a high tensile density of 45 wires/100 mm wires.

9. The all-steel radial truck tire as claimed in claim 1, wherein the tread is arranged on the outer side of the fifth layer of wire-cloth, and the carcass is arranged on the inner side of the first layer of wire-cloth.

10. The all-steel radial tire for heavy-duty engineering machinery with a novel structure as claimed in claim 9, wherein the tread is made of a mixed formula of low-heat-generation natural rubber and styrene butadiene rubber, the tire body is made of 3+9+15 × 0.20ST with 55 wires per 100mm, and the tire bead is made of phi 1.55 wires.

Technical Field

The invention relates to an off-highway all-steel radial tire for load-carrying engineering machinery (OTR), in particular to application of a novel structure (a structure with two 0-degree belted layers) in an OTR tire.

Background

Off-highway all-steel heavy-duty engineering machinery radial tires (OTR), 70% of the load is borne by the belt plies, especially the middle working ply cords.

The belt layer (belt ply) refers to a material layer that grips the carcass in the circumferential direction of the tread center line under the tread base of the radial tire. The cord fabric is composed of cord fabric which is made of high-strength, high-modulus and small-angle arranged cord fabric as reinforcing material and is covered with sizing material with high definite elongation and high hardness.

At present, the traditional belt ply structure mainly adopts 4 layers of steel wire rubber-coated cord fabric, and each layer of steel wire cord fabric is crosswise attached together by adopting a small angle and different arrangement directions.

The off-road all-steel radial tire for load-carrying engineering machinery (OTR) is mainly used for mining machinery load-carrying vehicles with harsh operating conditions, and is required to have strong bearing capacity, puncture resistance, cutting resistance and low heat generation.

Patent CN201420487699.4 discloses a light-duty load radial tire of all steel, including tread portion, sidewall, bead portion, ply, belted layer, its characterized in that: the belt ply comprises a 1# belt ply, a 2# belt ply, a 3# belt ply and a 4# belt ply, the belt ply adopts a variable angle design, the 4# belt ply is narrow in width, and one belt ply and one tackifying and reinforcing rubber sheet are used. The utility model discloses a claim its tire life extension 1 ~ 3 times, tire rolling resistance reduces 28% (green tire) and economizes on fuel 6% -6.5%, improves by a wide margin at harsh rocky environment puncture resistance, and when filling in the sea engineering operation, the crown puncture resistance can be fine, punctures badly, punctures and explodes and reduces. However, the included angle between the cord of the No. 1 belt layer and the central line of the crown surface is 22 degrees, the included angle between the cord of the No. 2 belt layer and the central line of the crown surface is 27 degrees, the included angle between the cord of the No. 3 belt layer and the central line of the crown surface is 20 degrees, the included angle between the cord of the No. 4 belt layer and the central line of the crown surface is 16 degrees, and the included angle between the cord of the No. 5 belt layer and the central line of the crown surface is 15 degrees. However, although the angle of the cord fabric of the belt ply is changed, the angle of the inflated tire tends to change towards the direction of 0 degree of the central line of the tire surface along with the increase of pressure, so that shoulder space or crown space is caused by deformation and large heat generation at the later stage of the use of the tire. And the light truck radial tire patent product which is TBR and the novel structure product of non-highway OTR have essential difference in the use environment.

Disclosure of Invention

The invention aims to overcome the deformation defects before and after use in the prior art, and provides a novel belt structure for a radial tire, which can effectively relieve the phenomena of shoulder hollows, crown hollows and the like caused by large tire heat generation due to the deformation of the tire caused by long-term bending deformation of the tire under a heavy load state.

The purpose of the invention can be realized by the following technical scheme: the utility model provides an off-road type all steel load engineering machinery radial tire of novel structure (adopting two-layer 0 belted layer structure), the belted layer structure of this tire comprises 5 layers of wire cord fabric, the first layer wire cord fabric is arranged on the matrix, its contained angle with between the tire tread central line is 23 + -1, the second layer wire cord fabric is arranged on the first layer wire cord fabric, its contained angle with between the tire tread central line is 17 + -1, the third layer wire cord fabric and the fourth layer wire cord fabric adopt and tire tread central line between the contained angle be 0 mode of circumference arrange on the second layer wire cord fabric in proper order, the fifth layer wire cord fabric is arranged on the fourth layer wire cord fabric, its contained angle with between the tire tread central line is 40 + -1.

The included angles between the first layer of steel wire cord fabric and the tire tread central line and the included angles between the second layer of steel wire cord fabric and the tire tread central line are opposite in arrangement direction, namely the included angle between the first layer of steel wire cord fabric and the tire tread central line is 23 +/-1 degrees counted from left to right, and the included angle between the second layer of steel wire cord fabric and the tire tread central line is 17 +/-1 degrees counted from right to left.

The third layer of steel wire cord fabric and the fourth layer of steel wire cord fabric are arranged between the second layer of steel wire cord fabric and the fifth layer of steel wire cord fabric in a circumferential direction in a mode that the widths of the third layer of steel wire cord fabric and the fourth layer of steel wire cord fabric are the same, and an included angle of 0 degree is formed between the third layer of steel wire cord fabric and the fourth layer of steel wire cord fabric, the third layer of steel wire cord fabric and the fourth layer of steel wire cord fabric are mainly used for bearing, the third layer of steel wire cord fabric and the fifth layer.

The included angles between the fifth layer of steel wire cord fabric and the tire tread central line of the second layer of steel wire cord fabric are arranged in opposite directions, namely the included angle between the fifth layer of steel wire cord fabric and the tire tread central line is 40 +/-1 degrees from left to right.

The third layer of steel wire cord fabric and the fourth layer of steel wire cord fabric are high-elongation cords, the density is 45 cords/100 mm, the thickness is 2.2mm, and the width is 252 mm.

The first layer of steel wire curtain cloth adopts steel wire curtain cloth with ultrahigh strength of 3+9+15 × 0.225HT, and the density is 48 steel wires/100 mm steel wires.

The fifth layer of the steel wire curtain cloth adopts 3 × 7 × 0.20HE steel wire curtain wires, and the high tensile density is 45 steel wires per 100 mm.

The outer side of the fifth layer of the steel cord fabric is provided with a tread, and the inner side of the first layer of the steel cord fabric is provided with a tire body.

The tread adopts a mixed formula of low-heat-generation natural rubber and styrene butadiene rubber, and the specific formula comprises the following components in parts by weight: 10-30 parts of natural rubber, 70-90 parts of emulsion styrene butadiene rubber, 10-40 parts of high-structure medium-ultra wear-resistant carbon black, 20-40 parts of low-structure high-wear-resistant carbon black, 5-15 parts of precipitation-process high-dispersion white carbon black and zinc oxide: 3-6 parts, stearic acid: 1-3 parts of protective wax: 1-3 parts of anti-aging agent, 2-7 parts of aromatic oil: 2-6 parts of tackifying resin: 1-4 parts of a physical peptizer: 1-2 parts of accelerator D: 0.1-0.6 part, common sulfur: 0.5-2 parts. Sulfenamide accelerator CZ: 0.5-2 parts of scorch retarder CTP: 0.1-0.4 part, during preparation, the raw materials in the weight ratio are processed into rubber compound by an internal mixer, the rubber compound is made into a tread semi-product by a double compound extruder, the tread semi-product is attached to the belt ply on a forming machine to make a tire blank, and the green tire blank is vulcanized into a finished tire by a vulcanizing machine.

The tyre body adopts 55 wires with the density of 55/100 mm and the tyre bead adopts phi 1.55 high-strength wires with the ultrahigh strength of 3+9+15 × 0.20 ST.

Compared with the prior art, the invention has the following advantages:

1. the belt structure adopted by the invention consists of 5 layers, the load is borne by the second layer, the third layer and the fourth layer of the steel cord fabric, the first layer of the steel cord fabric adopts a large-angle transition effect, and the fifth layer of the steel cord fabric plays a role in protecting the working layer; compared with the traditional structure, the product with the new structure has the following advantages: the deformation rate of the outer diameter of the durable tire is reduced by 30%, the endurance time is improved by 40%, the temperature of the tire tread is reduced by 15%, the wear resistance is improved by 20%, the bearing capacity is improved by 50%, and the puncture resistance is improved by more than 30%.

2. The third layer and the fourth layer of wirecord fabric are circumferentially arranged (the included angle between the third layer and the central line of the tire tread) by adopting a 0-degree mode for 2 layers, the angle change does not occur after the tire is inflated, the phenomena of shoulder vacancy, crown vacancy and the like caused by large tire heat generation caused by the deformation of the tire after long-term bending deformation under a heavy-load state can be effectively relieved, and meanwhile, the product is used in a low-speed and severe environment, and the phenomena of shoulder vacancy and delamination caused by high heat generation are avoided. Although the traditional product changes the cord angle of the belt ply, the angle of the inflated tire changes towards the direction of 0 degree of the central line of the tire surface along with the increase of the pressure, so that the shoulder space or the crown space is caused to generate heat due to deformation in the later period of the use of the tire.

3. The invention can effectively resist the damage of external sharp objects to the crown part of the tire, improve the puncture resistance of the tire, reduce the problem of delamination caused by heat generation, greatly improve the service cycle of the tire and meet the use requirements of vehicles in off-highway mining areas.

4. The belt structure of the invention does not need to be provided with an enhanced film and the like, thereby saving raw materials and process procedures and reducing the cost.

5. The tread adopted by the invention has good wear resistance, excellent puncture resistance, low heat generation, high tensile strength and tearing strength, good thermal stability and fatigue resistance, can effectively reduce the phenomenon of non-wear resistance caused by pattern gnawing and dropping, is suitable for the use requirements of mines and engineering vehicles on the tire, has excellent performance in the use process, and improves the use safety and the service life of the tire.

Drawings

FIG. 1 is a semi-sectional view of a tire of the present invention employing the belt structure of the present invention.

1-first layer of wirecord fabric, 2-second layer of wirecord fabric, 3-third layer of wirecord fabric, 4-fourth layer of wirecord fabric, 5-fifth layer of wirecord fabric, 6-tire body and 7-tire surface.

Detailed Description

The invention is described in detail below with reference to the figures and specific embodiments.

Example 1

As shown in figure 1, the off-road type all-steel heavy-duty engineering machinery radial tire with a novel structure (adopting a two-layer 0-degree belt structure) comprises a tire body 6, a tire tread 7 and a belt arranged between the tire body 6 and the tire tread 7, wherein the belt structure consists of 5 layers of steel wire cord fabrics, a first layer of steel wire cord fabric 1 is arranged on the tire body 6, the included angle between the first layer of steel wire cord fabric 1 and the tire tread central line is 23 degrees from left to right (namely, the included angle between the first layer of steel wire cord fabric 1 and the tire tread central line is 23 degrees from left to right), a second layer of steel wire cord fabric 2 is arranged on the first layer of steel wire cord fabric, the included angle between the second layer of steel wire cord fabric 2 and the tire tread central line is 17 degrees from right to left, a third layer of steel wire cord fabric 3 and a fourth layer of steel wire cord fabric 4 are sequentially and circumferentially arranged on the second layer of steel wire cord fabric in a mode that the included angle between the second layer of steel wire cord, the fifth layer of steel cord fabric 5 is arranged on the fourth layer of steel cord fabric, and the included angle between the fifth layer of steel cord fabric and the center line of the tire tread is 40 degrees (the included angle between the fifth layer of steel cord fabric 5 and the center line of the tire tread is 40 degrees from left to right).

The belt structure is used in a tire, the tread of the tire adopts a mixed formula of low-heat-generation natural rubber and styrene butadiene rubber, and the tread formula comprises the following components in parts by weight: 20 parts of natural rubber, 80 parts of emulsion styrene-butadiene rubber, 20 parts of high-structure medium-super wear-resistant carbon black, 30 parts of low-structure high-wear-resistant carbon black, 10 parts of precipitation-method high-dispersion white carbon black and zinc oxide: 5 parts, stearic acid: 2 parts of protective wax: 2 parts of anti-aging agent, 5 parts of aromatic oil: 5 parts of tackifying resin: 2 parts, physical peptizer: 1.5 parts, accelerator D: 0.3 part, common sulfur: 1 part, sulfonamide accelerator CZ: 1 part, scorch retarder CTP: 0.3 part.

During preparation: processing the raw materials in the weight ratio into rubber compound by an internal mixer, extruding the rubber compound by a double compound extruder to prepare a tread semi-product, attaching the tread semi-product on a belt ply on a forming machine to prepare a tire blank, and vulcanizing the green tire blank by a vulcanizing machine to obtain a finished tire. According to the tread formula, emulsion-polymerized styrene-butadiene rubber with a certain proportion is used, high-structure medium-super-wear-resistant carbon black (super-wear-resistant carbon black N-234 in high structure produced by Kabot chemical industry (Tianjin) Co., Ltd.) is used, the puncture resistance and wear resistance of the tread formula on a severe road surface are greatly improved, the tear resistance of the tread formula is improved by using a certain proportion of white carbon black (precipitated white carbon black 822MP produced by Wuxi Hecheng silicon industry can be used), and the heat generation of the tread formula is reduced by using the white carbon black and low-structure high-wear-resistant carbon black (sold N326 can be used).

The tread formula has excellent wear resistance and puncture resistance, low heat generation, high tensile strength and tear strength, good thermal stability and fatigue resistance, can effectively reduce the phenomenon of non-wear resistance caused by pattern gnawing and dropping, is suitable for the use requirements of mines and engineering vehicles on tires, has excellent performance in the use process, and improves the use safety and the service life of the tires.

The tyre body adopts ultrahigh strength 3+9+15 × 0.20ST density 55/100 mm steel wires, the tyre bead adopts phi 1.55 high strength steel wires, the first layer of belt ply and the second layer of belt ply adopt ultrahigh strength 3+9+15 × 0.225HT density 48/100 mm steel wires, the special two layers of the third layer of belt ply and the fourth layer of belt ply adopt 3 × 7 × 0.20HE high stretching density 45/100 mm steel wires, and the fifth layer adopts 3 × 7 × 0.20HE high stretching density 45/100 mm steel wires.

Table 1 comparison of tire test results for conventional construction and example 1 construction

In the comparison table, the conventional structure of CN201420487699.4, the diameter of the inflated outer edge after endurance is changed from 1493 to 1508.9, which is much larger than the change range of the present invention (the present invention is changed from 1490.8 to 1497.1), which shows that the tire of the present invention has better puncture resistance than the conventional structure of the non-zero belt in CN201420487699.4 of the prior art.

The endurance test conditions were: keeping the speed of 20km/h constant, starting with 10h 65% load, second 10h 85% load, third 10h 100% load, increasing the load by 10% after 30h every 5h until damage; the load is the maximum load of a single tyre, and the air pressure is the maximum air pressure of the single tyre. The ambient temperature is 38 +/-3 degrees, and the tire and rim assembly is parked for 24 hours at the ambient temperature.

Compared with the traditional structure, the deformation rate of the outer diameter of the durable tire of the embodiment 1 is reduced by 30%, the endurance time is improved by 40%, the temperature of the tire surface is reduced by 15%, the wear resistance is improved by 20%, the bearing capacity is improved by 50%, and the puncture resistance is improved by more than 30%.

Example 2

The tire tread formula of the tire comprises the following components in parts by weight: 10 parts of natural rubber, 70 parts of emulsion styrene-butadiene rubber, 40 parts of high-structure medium-super wear-resistant carbon black, 40 parts of low-structure high-wear-resistant carbon black, 5 parts of precipitation-method high-dispersion white carbon black and zinc oxide: 3 parts, stearic acid: 1 part of protective wax: 1 part, 2 parts of anti-aging agent, aromatic oil: 2 parts of tackifying resin: 1 part, physical peptizer: 1 part, accelerator D: 0.1 part, common sulfur: 0.5 part, sulfonamide accelerator CZ: 0.5 part, scorch retarder CTP: 0.1 part. The rest is as same as embodiment 1, and the tire that obtains compares with traditional structure, can effectively alleviate long-term bending under the tire heavy load state and cause the deformation of tire after the deformation, and the shoulder that the tire thermogenesis of bringing is big produced is empty and the pathological phenomena such as crown, can effectively resist the damage of outside sharp object to the tire crown, promotes the resistant prick of tire, reduces the problem that the thermogenesis produces the delaminating, can greatly improve tire life cycle, satisfies off-highway mining area vehicle operation requirement.

Example 3

The tire tread formula of the tire comprises the following components in parts by weight: 30 parts of natural rubber, 90 parts of emulsion styrene-butadiene rubber, 10 parts of high-structure medium-super wear-resistant carbon black, 20 parts of low-structure high-wear-resistant carbon black, 15 parts of precipitation-method high-dispersion white carbon black and zinc oxide: 6 parts, stearic acid: 3 parts of protective wax: 3 parts of anti-aging agent, 7 parts of aromatic oil: 6 parts of tackifying resin: 4 parts, physical peptizer: 2 parts, accelerator D: 0.6 part, common sulfur: 2 parts, sulfonamide accelerator CZ: 2 parts, scorch retarder CTP: 0.4 part.

The rest is as same as embodiment 1, and the tire that obtains compares with traditional structure, can effectively alleviate long-term bending under the tire heavy load state and cause the deformation of tire after the deformation, and the shoulder that the tire thermogenesis of bringing is big produced is empty and the pathological phenomena such as crown, can effectively resist the damage of outside sharp object to the tire crown, promotes the resistant prick of tire, reduces the problem that the thermogenesis produces the delaminating, can greatly improve tire life cycle, satisfies off-highway mining area vehicle operation requirement.