Polyurethane wheel capable of improving friction coefficient of tread

By setting up main bodies and embedded bodies with different hardness in the polyurethane wheel and forming tread patterns using the deformation difference, the problem of polyurethane wheel slipping on smooth or wet ground is solved, and the effect of improving the friction coefficient and grip of the tread is achieved.

CN222807839UActive Publication Date: 2025-04-29永州雅力德科技有限公司
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Patent Information

Application Number
CN202421930043.5
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-08-10
Publication Date
2025-04-29
Estimated Expiration
2034-08-10

AI Technical Summary

Technical Problem

Polyurethane wheels tend to slip on smooth or wet grounds, causing unstable vehicles, which can lead to rollover or collisions, especially under load conditions.

Method used

By providing a main body and an embedded body with different hardness in the wheel body of the polyurethane wheel, the deformation difference between the main body and the embedded body forms a pattern on the tread, thereby increasing the tread friction coefficient.

Benefits of technology

It effectively improves the tread friction coefficient, improves the grip of the polyurethane wheel, and enhances the driving stability and safety of the vehicle.

✦ Generated by Eureka AI based on patent content.

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Abstract

The polyurethane wheel comprises a wheel body, the wheel body comprises a steel ring and a rubber body which are coaxially arranged, the rubber body comprises a main body and an embedded body which are both made of polyester ammonia materials, the main body is wrapped in the outer circumferential direction of the steel ring, a plurality of profile grooves are formed in the cylindrical surface of the main body at intervals, and the profile grooves are embedded in the embedded body. An embedded body is formed in each groove in an injection molding mode, the hardness of the main body is different from that of the embedded bodies, the friction faces, exposed out of the grooves, of the embedded bodies and the cylindrical face of the main body form a tread of the wheel body, and the friction faces, exposed out of the cylindrical face, of the embedded bodies form patterns for improving the friction coefficient of the tread. According to the utility model, the main body and the embedded bodies are respectively formed by adopting two polyester ammonia prepolymers with different hardness, the embedded bodies are formed on the cylindrical surface of the main body through injection molding, and patterns formed by the cylindrical surface of the main body and the friction surfaces of the embedded bodies can improve the friction coefficient of the tread through the deformation difference between the main body and the embedded bodies; therefore, the road holding force of the polyester ammonia wheel is improved.
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Description

Technical Field

[0001] The utility model relates to the technical field of polyurethane wheels, in particular to a polyurethane wheel with improved tread friction coefficient. Background Art

[0002] Polyurethane wheels can be used as forklift wheels, logistics walking wheels, AGV transport wheels, and autonomous driving wheels. Polyurethane wheels have good wear resistance and load-bearing capacity, and still have good performance in extreme load environments. However, wheels made of polyurethane materials have a major defect, that is, the friction coefficient is not good. Polyurethane wheels are easy to slip on smooth or wet surfaces. Tire slippage is a relatively dangerous situation for vehicles, especially when there is a load, which can easily cause the vehicle to roll over or collide, which is not conducive to the safe use of the vehicle.

[0003] For this reason, it is necessary to design a polyester-ammonia wheel that can improve the friction coefficient of the tread. Utility Model Content

[0004] In order to solve the deficiencies of the prior art, the utility model provides a polyurethane wheel with improved tread friction coefficient.

[0005] The utility model provides a polyurethane wheel for improving the friction coefficient of the tread, comprising a wheel body, wherein the wheel body comprises a coaxially arranged steel ring and a colloid, wherein the colloid comprises a main body and an embedded body both of which are made of polyester amine material, wherein the main body is wrapped in the outer circumferential direction of the steel ring, a plurality of grooves are arranged at intervals on the cylindrical surface of the main body, an embedded body is injection-molded in each groove, the main body and the embedded body have different hardnesses, the friction surface of the embedded body exposed from the groove and the cylindrical surface of the main body form the tread of the wheel body, and the friction surfaces of the plurality of embedded bodies exposed on the cylindrical surface form a pattern for improving the friction coefficient of the tread.

[0006] In some embodiments, the colloid is a solid polyurethane colloid.

[0007] In some of the embodiments, the cross-section of the groove is square, trapezoidal or rhombus-shaped.

[0008] In some embodiments, the profile groove is arranged on the cylindrical surface of the main body in a transverse direction.

[0009] In some embodiments, the groove extends from one shoulder of the wheel body to the other shoulder.

[0010] In some embodiments, the embedded body includes a first transverse portion, an oblique connecting portion and a second transverse portion which are connected in sequence, the first transverse portion and the second transverse portion are arranged parallel to each other on two meridians of the wheel body, the oblique connecting portion is obliquely arranged between the first transverse portion and the second transverse portion, and the oblique connecting portions of each embedded body are parallel to each other.

[0011] In some embodiments, the first transverse portion and the second transverse portion of the embedded body respectively expose lateral contact surfaces on both side shoulders of the wheel body.

[0012] In some of the embodiments, the friction surface of the insert smoothly transitions to the cylindrical surface of the main body.

[0013] In some of these embodiments, the hardness of the embedding body is greater than the hardness of the main body.

[0014] In some of these embodiments, the hardness of the insert is less than the hardness of the main body.

[0015] Compared with the prior art, the utility model has the following beneficial effects: by using two polyester-ammonia prepolymers with different hardness to respectively form the main body and the embedded body, multiple embedded bodies are injection-molded on the cylindrical surface of the main body, and through the deformation difference between the main body and the embedded body, the pattern formed by the friction surface of the cylindrical surface of the main body and the embedded body can improve the tread friction coefficient, thereby improving the grip of the polyester-ammonia wheel. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is one of the three-dimensional structural schematic diagrams of the polyurethane wheel with improved tread friction coefficient according to the embodiment of the present application.

[0017] Figure 2 This is the second schematic diagram of the three-dimensional structure of the polyurethane wheel with improved tread friction coefficient according to the embodiment of the present application.

[0018] Figure 3 It is a schematic diagram of the planar structure of a polyurethane wheel for improving the tread friction coefficient according to one embodiment of the present application.

[0019] Figure 4 It is a schematic plan view of the structure of a polyurethane wheel for improving the tread friction coefficient according to another embodiment of the present application.

[0020] Reference numerals: 1, wheel body; 11, tread; 12, shoulder; 13, sidewall;

[0021] 2. Steel ring; 21. Flange; 22. Screw hole;

[0022] 3. Colloid;

[0023] 4. Main body; 41. Cylindrical surface; 42. Profile groove;

[0024] 5. Embedded body; 51. Friction surface; 52. First transverse portion; 53. Oblique connecting portion; 54. Second transverse portion; 55. Lateral contact surface. DETAILED DESCRIPTION

[0025] The specific implementation modes of the present utility model are introduced with reference to the accompanying drawings.

[0026] refer to Figure 1 The figure is a schematic diagram of the three-dimensional structure of a polyurethane wheel with improved friction coefficient of the tread 11. The wheel body 1 is cylindrical in shape, and a steel ring 2 and a colloid 3 are arranged from the inside to the outside. The steel ring 2 is used to connect with the axle of the vehicle. The colloid 3 is two or more polyurethane prepolymers with different hardnesses that are injection-molded in batches. The hardness of the main body 4 and the embedded body 5 is different. The formed tread 11 has a pattern that can improve the friction coefficient to improve the safety and stability of the vehicle.

[0027] refer to Figures 1 to 4 A polyurethane wheel for improving the friction coefficient of the tread 11 includes a wheel body 1, the wheel body 1 includes a coaxially arranged steel ring 2 and a colloid 3, the colloid 3 includes a main body 4 and an embedding body 5 both of which are made of polyester amine material, the main body 4 is wrapped in the outer circumferential direction of the steel ring 2, a cylindrical surface 41 of the main body 4 is provided with a plurality of grooves 42 at intervals, an embedding body 5 is injection molded in each groove 42, the main body 4 and the embedding body 5 have different hardnesses, a friction surface 51 of the embedding body 5 exposed from the groove 42 and the cylindrical surface 41 of the main body 4 constitute the tread 11 of the wheel body 1, and the friction surfaces 51 of the plurality of embedding bodies 5 exposed on the cylindrical surface 41 form a pattern for improving the friction coefficient of the tread 11.

[0028] The polyurethane wheel with improved friction coefficient of tread 11 in the embodiment of the present application is formed by respectively using two polyester-ammonia prepolymers with different hardness to form a main body 4 and an embedded body 5, and a plurality of embedded bodies 5 are injection molded on a cylindrical surface 41 of the main body 4. Due to the difference in deformation between the main body 4 and the embedded bodies 5, a pattern formed by the cylindrical surface 41 of the main body 4 and the friction surface 51 of the embedded bodies 5 can improve the friction coefficient of tread 11, thereby improving the grip of the polyester-ammonia wheel.

[0029] It should be further explained that when the tread 11 of the wheel body 1 contacts the ground, the deformation of the embedding body 5 and the main body 4 is different. The side with greater hardness becomes smaller, and the side with less hardness becomes larger, so that the side with greater hardness is more raised than the side with less hardness, so that the pressure and friction between the friction surface 51 of the embedding body 5 and the ground are different from the pressure and friction between the cylindrical surface 41 of the main body 4 and the ground, thereby increasing the friction coefficient between the tread 11 and the ground and providing grip for the wheel body 1.

[0030] In order to ensure that the wheel body 1 has sufficient bearing capacity, in this embodiment, Figure 1 , the colloid 3 is a solid polyurethane colloid 3.

[0031] It is understandable that, with such a configuration, the solid combination of the colloid 3 and the steel ring 2 can greatly improve the bearing capacity of the wheel body 1 , and at the same time, the polyurethane colloid 3 can enhance the wear resistance and impact resistance of the tread 11 , thereby extending the service life of the tread 11 .

[0032] In order to ensure the stable combination between the embedded body 5 and the main body 4, in this embodiment, reference Figure 3 The cross section of the groove 42 is square, wherein the square includes a rectangular shape and a square shape.

[0033] In another embodiment, referring to Figure 4 , the cross section of the groove 42 is trapezoidal.

[0034] In another embodiment, the cross section of the groove 42 is a diamond shape (not shown in the drawings).

[0035] It can be understood that such a configuration, regardless of whether the groove 42 is square, trapezoidal or diamond-shaped, is to ensure that after the embedded body 5 is injection molded in the groove 42, the embedded body 5 is stably combined with the main body 4, thereby preventing the embedded body 5 from rotating relative to the main body 4, causing the embedded body 5 to fall off the main body 4.

[0036] It should be further explained that a steel wire may be coated between the main body 4 and the embedded body 5, and the embedded body 5 and the main body 4 may be stably combined together by the tension of the steel wire, and the steel wire may be a meridian or a diagonal wire.

[0037] In order to make the formed pattern have better friction, in this embodiment, reference Figure 1 and Figure 2 The profile groove 42 is arranged on the cylindrical surface 41 of the main body 4 in the transverse direction.

[0038] It can be understood that, with such an arrangement, the transversely arranged groove 42 can form a transverse embedded body 5, thereby forming a transverse pattern on the tread 11. The transverse pattern can enhance the driving force and braking force of the wheel body 1, provide stronger grip and braking force, have high friction, good handling performance, can enhance the driving stability of the vehicle, and can be suitable for professional vehicles that require large traction.

[0039] In order to enhance the friction coefficient of the wheel shoulder 12, in this embodiment, Figure 1 and Figure 2 The groove 42 extends from one shoulder 12 of the wheel body 1 to the other shoulder 12 .

[0040] It is understandable that, in such a configuration, the profile groove 42 extends to the tread shoulder 12 , so that the embedded body 5 can be exposed at the tread shoulder 12 , thereby increasing the friction coefficient of the tread shoulder 12 as well as the tread 11 .

[0041] In order to ensure that the pattern formed by the embedded body 5 on the tread 11 has sufficient friction, in this embodiment, Figure 1 and Figure 2The embedded body 5 includes a first transverse portion 52, an oblique connecting portion 53 and a second transverse portion 54 which are connected in sequence. The first transverse portion 52 and the second transverse portion 54 are arranged parallel to each other on two meridians of the wheel body 1. The oblique connecting portion 53 is obliquely arranged between the first transverse portion 52 and the second transverse portion 54. The oblique connecting portions 53 of each embedded body 5 are parallel to each other.

[0042] It can be understood that, with such an arrangement, the first transverse portion 52, the oblique connecting portion 53 and the second transverse portion 54 of the embedded body 5 form a "ㄣ" shape, the first transverse portion 52 and the second transverse portion 54 of the embedded body 5 form a transverse pattern, and the oblique connecting portion 53 of the embedded body 5 forms a longitudinal pattern, so that the tread 11 has transverse and longitudinal patterns, ensuring that the tread 11 has sufficient friction.

[0043] In order to enhance the friction coefficient of the wheel shoulder 12, in this embodiment, Figure 1 and Figure 2 The first transverse portion 52 and the second transverse portion 54 of the embedded body 5 respectively expose lateral contact surfaces 55 on the shoulders 12 on both sides of the wheel body 1.

[0044] It can be understood that, with such a configuration, the first lateral portion 52 and the second lateral portion 54 extend outward respectively, and expose the lateral contact surface 55 at the shoulders 12 on both sides. The lateral contact surface 55 is too smooth with the shoulder 12 surface. Through the deformation difference between the embedded body 5 and the main body 4, the lateral contact surface 55 can enhance the friction coefficient of the shoulder 12 of the wheel body 1.

[0045] In order to reduce the wear of the tread 11, in this embodiment, reference Figure 1 and Figure 2 The friction surface 51 of the embedded body 5 and the cylindrical surface 41 of the main body 4 are smoothly transitioned.

[0046] It is understandable that with such an arrangement, during the rotation of the wheel body 1, the friction surface 51 and the cylindrical surface 41 transition smoothly, which can avoid excessive stress concentration on the edges of the embedment 5 and the edges of the groove 42, thereby reducing the wear of the edges of the embedment 5 and the edges of the groove 42 and improving the wear resistance of the entire tread 11.

[0047] It should be further explained that the position and shape of the embedding body 5 on the wheel body 1 can also be designed and adjusted according to different working conditions, so as to develop corresponding polyester-ammonia wheels for different working conditions.

[0048] In order to make the deformation of the embedded body 5 and the main body 4 different, in this embodiment, the hardness of the embedded body 5 is greater than the hardness of the main body 4.

[0049] In another embodiment, the hardness of the insert 5 is less than the hardness of the main body 4 .

[0050] It can be understood that, with such a configuration, no matter whether the hardness of the embedding body 5 is greater or the hardness of the main body 4 is greater, the purpose is to make the hardness of the embedding body 5 and the main body 4 different, so that when the pressure of the tread 11 is constant, the deformation of the embedding body 5 and the main body 4 are different, so that the tread 11 can still maintain good grip performance. At the same time, the friction surface 51 of the embedding body 5 exposed from the groove 42 and the cylindrical surface 41 of the main body 4 constitute the tread 11 of the wheel body 1, and the friction surfaces 51 of the multiple embedding bodies 5 exposed on the cylindrical surface 41 form a pattern that improves the friction coefficient of the tread 11, and this pattern can increase the grip of the tread 11.

[0051] It needs to be further explained that the steel rim 2 can ensure that the wheel body 1 has good rigidity and strength. The steel rim 2 has a flange 21 connected to the vehicle axle. Screw holes 22 are provided at equal angles on the flange 21. Bolts fixedly connected to the axle are installed at the screw holes 22 on the flange 21, so that the wheel body 1 is installed on the axle. The sidewall 13 of the wheel body 1 is higher than the steel rim 2, so as to protect the steel rim 2.

[0052] The production of the polyurethane wheel for improving the friction coefficient of the tread 11 of the present embodiment mainly utilizes a two-step injection molding process. First, two polyurethane prepolymers with different hardness are prepared, such as PU-84A and PU-92A. The PU-92A polyurethane prepolymer is overmolded on the steel ring 2. The cylindrical surface 41 of the prepared main body 4 is formed with multiple grooves 42. PU-84A polyurethane prepolymer is simultaneously injected into the multiple grooves 42 of the main body 4. After molding, a polyurethane wheel with two different hardnesses is obtained.

[0053] The polyurethane wheel with improved friction coefficient of tread 11 in the embodiment of the present application mainly improves the grip of tread 11 of wheel body 1 by deformation difference between materials of different hardness. Specifically, two polyester-ammonia prepolymers of different hardness are used to respectively form main body 4 and embedded body 5, and multiple embedded bodies 5 are injection molded on cylindrical surface 41 of main body 4. Through deformation difference between main body 4 and embedded body 5, pattern formed by cylindrical surface 41 of main body 4 and friction surface 51 of embedded body 5 can improve friction coefficient of tread 11 and grip of polyester-ammonia wheel, thereby improving grip performance of vehicle and making vehicle safer and more reliable.

[0054] The above does not limit the technical scope of the present invention. Any modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A polyurethane wheel with improved tread friction coefficient, characterized in that: It includes a wheel body, which includes a coaxially arranged steel ring and a colloid. The colloid includes a main body and an embedded body, both of which are made of polyester-ammonia material. The main body is wrapped in the outer circumferential direction of the steel ring. The cylindrical surface of the main body is provided with a plurality of grooves at intervals. An embedded body is injection-molded in each groove. The main body and the embedded body have different hardnesses. The friction surface of the embedded body exposed from the groove and the cylindrical surface of the main body constitute the tread of the wheel body. The friction surfaces of the plurality of embedded bodies exposed on the cylindrical surface form a pattern that improves the friction coefficient of the tread.

2. The polyurethane wheel with improved tread friction coefficient according to claim 1, characterized in that: The colloid is a solid polyurethane colloid.

3. The polyurethane wheel with improved tread friction coefficient according to claim 1, characterized in that: The cross section of the profile groove is square, trapezoidal or rhombus-shaped.

4. The polyurethane wheel with improved tread friction coefficient according to claim 1, characterized in that: The profile groove is arranged on the cylindrical surface of the main body in the transverse direction.

5. The polyurethane wheel with improved tread friction coefficient according to claim 1, characterized in that: The profile groove extends from one shoulder of the wheel body to the other shoulder of the wheel body.

6. The polyurethane wheel with improved tread friction coefficient according to claim 1, characterized in that: The embedded body includes a first transverse portion, an oblique connecting portion and a second transverse portion which are connected in sequence. The first transverse portion and the second transverse portion are arranged parallel to each other on two meridians of the wheel body. The oblique connecting portion is obliquely arranged between the first transverse portion and the second transverse portion. The oblique connecting portions of each embedded body are parallel to each other.

7. The polyurethane wheel with improved tread friction coefficient according to claim 6, characterized in that: The first transverse portion and the second transverse portion of the embedded body respectively expose lateral contact surfaces on the shoulders on both sides of the wheel body.

8. The polyurethane wheel with improved tread friction coefficient according to claim 6, characterized in that: The friction surface of the embedding body transitions smoothly with the cylindrical surface of the main body.

9. The polyurethane wheel with improved tread friction coefficient according to claim 1, characterized in that: The hardness of the embedding body is greater than the hardness of the main body.

10. The polyurethane wheel with improved tread friction coefficient according to claim 1, characterized in that: The hardness of the embedded body is lower than the hardness of the main body.