Bionic tire crown curve of tire
By designing a biomimetic tire crown curve that mimics the foot structure of even-toed ungulates, the problem of rapid wear at the center of the tire crown on heavy engineering vehicles has been solved, resulting in a more uniform force distribution and extended tire life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-18
- Publication Date
- 2026-03-10
AI Technical Summary
Heavy-duty engineering vehicle tires have rapid wear at the center of the tread, resulting in a short service life. Uneven stress distribution also leads to safety hazards and high after-sales costs.
The design adopts a biomimetic crown curve, simulating the biomechanical characteristics of the foot of an even-toed ungulate. The center of the crown is a smooth concave curve, and the two sides are smooth convex curves, forming a symmetrical shape with a low center and high sides. Wear-resistant rubber material is used.
It effectively distributes tire pressure, reduces wear at the center of the tire crown, extends tire life, improves safety, and reduces after-sales costs.
Smart Images
Figure CN223982344U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of engineering machinery tire for heavy engineering vehicles, more particularly to a bionic crown curve of tire. BACKGROUND
[0002] For assembly on the tire rim of heavy engineering vehicles, the nominal diameter of the rim is at least 25 inches in the meaning of CAS (China Tire Rim Valve Standard Yearbook) and ETRTO (European Tire Rim Technology Organization) standards. However, the utility model is not limited to this type of application, and is more particularly described with reference to engineering machinery tires intended to be fitted to, for example, wide-body dump trucks, which are vehicles for large hard rock, gravel, soil, etc. Mining road surfaces, the working environment of the tire is complex and harsh.
[0003] As shown in Figure 4 , after the tire is inflated, the crown surface of the ordinary tire appears as a convex flat curve. Such a crown curve structure, in the actual use process, the crown is compressed by radial and lateral compression force, the crown is extruded to produce deformation, due to the incompressibility of the rubber material, the rubber at the center of the crown will expand horizontally, the rubber material at the center of the crown expands, the rubber accumulates to the edge of the center area of the crown, and the ground pressure is formed at the center of the crown. Moreover, the load of the engineering machinery tire is high, the inflation pressure is generally large, the tire is unevenly stressed, and the stress points are concentrated at the center of the crown, so the center of the tire crown is often worn out quickly. Under the influence of complex forces, the entire crown surface curve at the shoulder of the non-ground center is in a state of extremely uneven stress, and the wear degree of the shoulder area is much smaller than that of the center of the crown, thereby causing uneven wear at the center of the crown. Not only does it reduce the service life of the tire, but also increases the after-sales cost and safety hazards. CONTENT OF THE UTILITY MODEL
[0004] To solve the above technical problems, the utility model provides a bionic crown curve of tire, which accurately simulates the biomechanical characteristics of the hooves of odd-toed animals to construct. As shown in Figure 1 , odd-toed animals are known for their unique characteristics, each of the four feet usually has two toes or four toes, and the bottom surface of the hoof presents a unique curved surface and split structure. The hoof split and the curved surface cooperate to make the hoof contact with the ground when landing. The pressure distribution is delicate and uniform. When such animals run on grasslands, mountains and other complex terrains, this natural structure can not only firmly grasp the ground, but also reasonably distribute the body weight to avoid excessive local pressure. Based on this bionics principle, this design can effectively disperse the pressure borne by the tire during driving, reduce the wear of the center of the crown, and prolong the service life of the tire.
[0005] In order to achieve the above object, the utility model adopts the following technical scheme:
[0006] A bionic crown curve of a tire, the crown curve is combined by circular arc curves, the crown curve shape is symmetrical shape of low in the middle and high on both sides, which is combined by a crown center curve cc', transition curves bc and b'c' on both sides of the crown center curve cc', and shoulder curves ab and a'b' on both sides;
[0007] The crown center curve cc' is a smooth concave curve along the normal direction of the tire crown surface, the shoulder curve ab and the shoulder curve a'b' are smooth convex curves along the normal direction of the tire crown surface, and the crown center curve cc', the transition curves bc and b'c', the shoulder curve ab and the shoulder curve a'b' are symmetrically arranged relative to a crown center point o.
[0008] The transition curves bc and b'c' are smooth curves, and the smooth curves are connected with the shoulder curve ab and the shoulder curve a'b' on both sides of the crown center curve cc' respectively.
[0009] The crown center point o is 1-5 mm lower than the highest point of the convex position of the shoulder curve ab and the shoulder curve a'b' on both sides.
[0010] The crown center point o is 3-8 mm higher than the lowest point position of the shoulder curve ab and the shoulder curve a'b' on both sides.
[0011] The left part co of the crown center curve cc' is located in the 1 / 3 area of the distance from the crown center point o to the lowest point of the shoulder curve ab, and the right part oc' of the crown center curve cc' is located in the 1 / 3 area of the distance from the crown center point o to the lowest point of the shoulder curve a'b'.
[0012] The shoulder curve ab is located in the 1 / 3 area of the distance from the lowest point of the shoulder curve ab to the crown center point o, and the shoulder curve a'b' is located in the 1 / 3 area of the distance from the lowest point of the shoulder curve a'b' to the crown center point o.
[0013] The transition curves bc and b'c' are concave curves, and the concave curves are connected with the shoulder curve ab and the shoulder curve a'b' on both sides of the crown center curve cc' respectively.
[0014] The lowest point of the transition curves bc and b'c' is higher than the crown center point o.
[0015] The crown curve body is made of wear-resistant rubber material.
[0016] Compared to existing technologies, the biomimetic crown curve of this invention features a smooth concave center curve and smooth convex shoulder curves on both sides. The crown curve has a symmetrical shape with a low center and high sides. During the contact process between the tire tread and the ground, it can effectively reduce the ground stress at the center of the crown, reduce wear at the center of the crown, and increase the service life of the tire. Attached Figure Description
[0017] Figure 1 The tire crown curve of this utility model is based on the foot curve of an even-toed ungulate.
[0018] Figure 2 This is a schematic diagram of the tire structure of this utility model, which mimics the crown curve of a two-toed cloven-hoofed animal.
[0019] Figure 3 This is a schematic diagram of the tire structure of this utility model, which mimics the crown curve of a four-toed even-toed animal.
[0020] Figure 4 This is a schematic diagram of the surface curve of a conventional tire crown in existing technology.
[0021] Among them, 1-1 is the shoulder curve ab; 1-2 is the shoulder curve a'b'; 2-1 is the transition curve bc; 2-2 is the transition curve b'c'; 3 is the crown center curve cc'; and 4 is the crown center point o. Detailed Implementation
[0022] The present invention will now be described in detail using the tread profile of a 16.00 R25 tire as a specific example. It should be noted that this example is only used to further illustrate the present invention and should not be construed as a limitation on the scope of protection of the present invention. Those skilled in the art can make some non-essential improvements and adjustments based on the above content of the present invention.
[0023] Please see Figure 2 The present invention provides a schematic diagram of the structure of a tire that mimics the crown curve of a two-toed cloven-hoofed animal.
[0024] A biomimetic tire crown curve is provided, which is composed of a combination of circular arc curves. The crown curve has a symmetrical shape with a low center and high sides. It is composed of the crown center curve cc' 3, the transition curves bc2-1 and b'c' 2-2 located on both sides of the crown center curve cc', and the shoulder curves ab 1-1 and a'b' 1-2 located on both sides. The circular arc part of the crown center curve cc' 3 simulates the curved part of the sole of an even-toed ungulate's foot, and the circular arc parts of the shoulder curves ab 1-1 and a'b' 1-2 simulate the ground contact part of the sole of an even-toed ungulate's foot.
[0025] The crown center curve cc' 3 is a smooth concave curve along the normal direction of the tire crown surface; the shoulder curves ab 1-1 and a'b' 1-2 on both sides are smooth convex curves along the normal direction of the tire crown surface; the crown center curve cc' 3, transition curves bc 2-1 and b'c' 2-2, shoulder curves ab 1-1 and a'b' 1-2 are symmetrically set with respect to the crown center point o 4.
[0026] The transition curves bc 2-1 and b'c' 2-2 are smooth curves. The smooth curves smoothly connect the two sides of the crown center curve cc' 3 to the shoulder curves ab 1-1 and a'b' 1-2, respectively.
[0027] The center point of the tread, o4, is 1-5 mm lower than the highest point of the bulges on the shoulder curves ab1-1 and a'b'1-2.
[0028] The center point of the tread, o4, is 3-8 mm higher than the lowest point of the shoulder curves ab1-1 and a'b'1-2 on both sides.
[0029] The left part of the crown center curve cc' 3, co, is located in the 1 / 3 region of the distance from the crown center point o 4 to the lowest point of the shoulder curve ab 1-1, and the right part of the crown center curve cc' 3, oc', is located in the 1 / 3 region of the distance from the crown center point o 4 to the lowest point of the shoulder curve a'b' 1-2.
[0030] Shoulder curve ab 1-1 is located in the 1 / 3 region of the distance from the lowest point of shoulder curve ab 1-1 to the center point o 4 of the tummy crown, and shoulder curve a'b' 1-2 is located in the 1 / 3 region of the distance from the lowest point of shoulder curve a'b' 1-2 to the center point o 4 of the tummy crown.
[0031] To improve tire wear resistance, the tread profile is made of rubber material with good wear resistance and anti-aging properties, which can effectively extend the tire's service life.
[0032] The curvature requirements for tire crown curves may vary depending on the tire size and usage requirements. Therefore, the curvature of the tire crown curve body of this invention can be adjusted according to actual conditions to meet the needs of different users.
[0033] Experimental verification:
[0034] Under the same inflation pressure and the same load conditions (1350 kPa inflation pressure, 13000 kg load), the ground pressure of the bionic tire crown curve provided by this utility model and the ordinary tire crown curve are compared. Except for the surface structure, the bionic tire crown curve of this application and the ordinary tire crown curve are the same.
[0035] like Figure 4 As shown in the diagram, after a tire is inflated, the surface of a regular tire crown appears as a flat, convex curve.
[0036] Through simulation technology, a stress distribution diagram of the grounding surface was obtained. Under the same characterization scale, a comparative analysis was conducted on a tire with a biomimetic crown curve provided in this invention and a tire with a conventional crown curve. The analysis showed that the stress distribution on the surface of the tire with the biomimetic crown curve of this invention is more uniform, and the stress concentration effect at the center of the crown is significantly improved. Furthermore, the data results showed that under the same inflation pressure and load conditions, the maximum ground pressure of the tire with a conventional crown curve was 1 MPa, while the maximum ground pressure of the tire with the biomimetic crown curve was 0.8 MPa, a reduction of 20%. This effectively reduces wear at the center of the crown, thereby improving tire lifespan.
[0037] Please see Figure 3 The present invention provides a schematic diagram of the structure of a tire that mimics the crown curve of a four-toed cloven-hoofed animal.
[0038] The tread curve is composed of a combination of circular arc curves. The tread curve has a symmetrical shape with a low center and high sides. It is composed of the tread center curve cc' 3, the transition curves bc 2-1 and b'c' 2-2 located on both sides of the tread center curve cc' 3, and the shoulder curves ab 1-1 and a'b' 1-2 located on both sides. The tread center curve cc' 3 is a smooth concave curve along the normal direction of the tire tread surface. The shoulder curves ab 1-1 and a'b' 1-2 are smooth convex curves along the normal direction of the tire tread surface. The tread center curve 3, the transition curves bc 2-1 and b'c' 2-2, and the shoulder curves ab 1-1 and a'b' 1-2 are symmetrically arranged with respect to the tread center point o 4.
[0039] The transition curves bc 2-1 and b'c' 2-2 are concave curves, which smoothly connect the two sides of the crown center curve cc'3 to the shoulder curves ab 1-1 and a'b' 1-2, respectively.
[0040] The lowest point of the indentation in transition curves bc 2-1 and b'c' 2-2 is higher than the center point o 4 of the tire crown.
[0041] The biomimetic tire crown curve of this invention has a symmetrical shape with a low center and high sides. When the tire is subjected to ground pressure, the contact area between the center curve cc' 3 and the ground is relatively small, and the ground pressure it bears is also relatively small, thus allowing for lateral expansion. Meanwhile, the contact areas between the shoulder curves ab 1-1 and a'b' 1-2 and the ground are relatively large, which can effectively alleviate the problem of faster wear at the center of the tire crown caused by accumulation in the center area, thereby increasing the tire's service life.
[0042] In summary, the biomimetic tire crown curve of this invention has advantages such as simple structure, reasonable design, effective reduction of crown center wear, and extension of tire service life.
[0043] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. It should be noted that for those skilled in the art and any person skilled in the art, any equivalent substitutions or changes made based on the technical solution and utility model concept of the present utility model without departing from the overall concept of the present utility model, as well as any changes and improvements made, should also be considered within the protection scope of the present utility model.
Claims
1. A biomimetic crown curve for a tire, characterized in that, The crown curve is combined by circular arc curves, and the crown curve has a symmetric shape with a low middle and high sides, which is combined by a crown center curve cc', transition curves bc and b'c' on both sides of the crown center curve cc', and shoulder curves ab and a'b' on both sides. The crown center curve cc' is a smooth concave curve along the normal direction of the tire crown surface, the shoulder curves ab and a'b' are smooth convex curves along the normal direction of the tire crown surface, and the crown center curve cc', the transition curves bc and b'c', and the shoulder curves ab and a'b' are symmetrically arranged relative to a crown center point o.
2. A biomimetic crown curve for a tire according to claim 1, characterized in that, The transition curves bc and b'c' are smooth curves that smoothly connect the crown center curve cc' on both sides to the shoulder curves ab and a'b' respectively.
3. A biomimetic crown curve for a tire according to claim 2, characterized in that, The crown center point o is 1-5 mm lower than the highest point of the convex position of the shoulder curves ab and a'b' on both sides.
4. A biomimetic crown curve for a tire according to claim 2, wherein, The crown center point o is 3-8 mm higher than the lowest point of the shoulder curves ab and a'b' on both sides.
5. A biomimetic crown curve for a tire according to claim 2, wherein, The left part co of the crown center curve cc' is located in the 1 / 3 area of the distance from the crown center point o to the lowest point of the shoulder curve ab, and the right part oc' of the crown center curve cc' is located in the 1 / 3 area of the distance from the crown center point o to the lowest point of the shoulder curve a'b'.
6. A biomimetic crown curve for a tire according to claim 2, wherein, The shoulder curve ab is located in the 1 / 3 area of the distance from the lowest point of the shoulder curve ab to the crown center point o, and the shoulder curve a'b' is located in the 1 / 3 area of the distance from the lowest point of the shoulder curve a'b' to the crown center point o.
7. A biomimetic crown curve for a tire according to claim 1, wherein, The transition curves bc and b'c' are concave curves that smoothly connect the crown center curve cc' on both sides to the shoulder curves ab and a'b' respectively.
8. A biomimetic crown curve for a tire according to claim 7, characterized in that, The lowest point of the transition curves bc and b'c' is higher than the crown center point o.
9. A biomimetic crown curve for a tire according to claim 1, wherein, The crown curve body is made of wear-resistant rubber material.