High load shear resistant omni wheel bearing assembly

Abstract

This invention discloses a high-load, shear-resistant omnidirectional wheel bearing assembly, relating to the field of bearing technology. It includes a double-layer omnidirectional wheel, comprising two hubs. Each hub has driven rollers evenly distributed circumferentially, with the driven rollers on the two hubs arranged alternately. A support shaft is coaxially fixed through the center of the double-layer omnidirectional wheel. The support shaft is positioned along the left-right direction, with support bases at both ends. Mounting through holes are formed on the support bases along the left-right direction, coaxially fitted around the support shaft. A first bearing module is located on the left side inside the mounting through hole, and a second bearing module is located on the right side inside the mounting through hole. The beneficial effects of this invention are: it effectively solves the shear impact problem on the bearing when the double-layer omnidirectional wheel is subjected to loads causing the load center to shift back and forth, thereby improving bearing life and enhancing operational reliability.

Description

Technical Field

[0001] This invention relates to the field of bearing technology, and more specifically to a high-load, shear-resistant omnidirectional wheel bearing assembly. Background Technology

[0002] Because omnidirectional wheels have the ability to move in multiple directions, they are often used in situations where space is limited and the platform's mobility is critical. However, the driven rollers distributed on the hub of an omnidirectional wheel are not perfectly circular, and there is a large gap between the driven rollers. This means that when rolling and conveying objects, the contact points between a single-layer omnidirectional wheel and the object are not distributed on a strictly circular trajectory, which can cause significant vibration. Therefore, two-layer hubs are usually used to create a "gap" between the two layers of driven rollers to compensate for the gap and reduce the radial vibration problem caused by the aforementioned gap.

[0003] While the radial vibration problem can be solved by the complementarity of the two omnidirectional wheels, the staggered arrangement of the driven rollers on the double-layer omnidirectional wheels causes the contact point with the ground to change back and forth above the two layers of omnidirectional wheels. This acts on the omnidirectional wheel support shaft, which means that the load center on the support shaft is changing back and forth. This causes the omnidirectional wheel to wobble and vibrate axially. This acts on the bearings at both ends of the support shaft, which means that the bearings are subjected to repeated shearing impacts.

[0004] In applications with high load conditions, such as heavy-duty cargo transport vehicles and unmanned forklifts in factories, where both high load capacity and high flexibility are required, double-layer omnidirectional wheels are used as tires. Because omnidirectional wheels lack an inflatable structure compared to traditional tires, their shock absorption capacity is weaker. Furthermore, due to the radial vibration and axial oscillation characteristics of omnidirectional wheel assemblies, the requirements for the impact and shear resistance of the support shaft and bearings are extremely stringent under heavy load conditions. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a high-load anti-shear omnidirectional wheel bearing assembly that can alleviate the reciprocating shear impact on the bearing and support shaft when the load center changes back and forth due to the load on the double-layer omnidirectional wheel, thereby improving the bearing life and enhancing the reliability of operation.

[0006] The technical solution adopted in this invention is as follows: A high-load, shear-resistant omnidirectional wheel bearing assembly is provided, comprising a double-layer omnidirectional wheel. The double-layer omnidirectional wheel includes two hubs, each hub having driven rollers evenly distributed circumferentially. The driven rollers on the two hubs are arranged alternately. A support shaft is coaxially fixed through the middle of the double-layer omnidirectional wheel. The support shaft is arranged in the left-right direction. Support bases are respectively provided at the left and right ends of the support shaft. Mounting through holes are opened in the left-right direction on the support bases. The mounting through holes are coaxially fitted around the support shaft. A first bearing module is provided on the left side inside the mounting through hole, and a second bearing module is provided on the right side inside the mounting through hole. When the driven rollers of the double-layer omnidirectional wheel alternately touch the ground, the support shaft alternately contacts the first bearing module and the second bearing module.

[0007] Further optimizing this technical solution, the first bearing module includes first load bearings evenly distributed circumferentially around the periphery of the support shaft; the first load bearings are connected to the support base via bearing housing A; the outer wall of the first load bearings rolls in correspondence with the outer wall of the support shaft; the number of first load bearings on each first bearing module is consistent with the number of driven rollers on a single-layer hub; the distance from the left first load bearing to the left hub is consistent with the distance from the right first load bearing to the left hub; first longitudinal sections are evenly distributed circumferentially on both sides of the support shaft; the number of first longitudinal sections on the left is consistent with the number of first longitudinal sections on the right, and both are equal to the number of driven rollers on a single-layer hub; the sum of the central angles corresponding to all the first longitudinal sections is 360°;

[0008] The second bearing module includes second load bearings evenly distributed circumferentially around the periphery of the support shaft; the second load bearings are connected to the support base via bearing housings B; the outer walls of the second load bearings roll in correspondence with the outer walls of the support shaft; the number of second load bearings on each second bearing module is the same as the number of driven rollers on the single-layer hub; the distance from the left second load bearing to the right hub is the same as the distance from the right second load bearing to the right hub; second longitudinal sections are evenly distributed circumferentially on both sides of the support shaft; the number of second longitudinal sections on the left is the same as the number on the right, and both are equal to the number of driven rollers on the single-layer hub; the sum of the central angles corresponding to all the second longitudinal sections is 360°;

[0009] When the driven roller on the left hub bears the load, the first load bearing rolls against the outer wall of the support shaft, and the second load bearing is aligned with the second longitudinal section. When the driven roller on the right hub bears the load, the second load bearing rolls against the outer wall of the support shaft, and the first load bearing is aligned with the first longitudinal section.

[0010] To further optimize this technical solution, the outer wall of the support shaft of the high-load anti-shear omnidirectional wheel bearing assembly is uniformly coated with a wear-resistant coating.

[0011] To further optimize this technical solution, the first load bearing and the second load bearing in the same support base of the high load anti-shear omnidirectional wheel bearing assembly correspond one-to-one in the left and right directions; the first longitudinal section and the second longitudinal section at the same end of the support shaft are staggered in sequence.

[0012] To further optimize this technical solution, the first load bearing and the second load bearing in the same support base of the high load anti-shear omnidirectional wheel bearing assembly are staggered in sequence; the first longitudinal section and the second longitudinal section at the same end of the support shaft correspond one-to-one in the left and right directions.

[0013] The beneficial effects of this invention are as follows:

[0014] The support base is used to install the first bearing module and the second bearing module that support the rotation of the support shaft. The rotation of the support shaft can drive the double-layer omnidirectional wheel to rotate, realizing the working process of the double-layer omnidirectional wheel.

[0015] The first load bearing is evenly distributed circumferentially around the outer periphery of the support shaft, and the second load bearing is also evenly distributed circumferentially around the outer periphery of the support shaft. When the driven roller on the left hub bears a load, the first load bearing rolls and rubs against the outer wall of the support shaft, while the second load bearing aligns with the second longitudinal section. This indicates that when the driven roller on the left bears a load, the first load bearing ensures the support effect on the support shaft, while the second load bearing is separated from the support shaft and does not provide support. Furthermore, since the distance from the left first load bearing to the left hub is the same as the distance from the right first load bearing to the left hub, when the driven roller on the left bears a load, the distance from the support point of the first load bearing on both sides to the load center is equal, achieving a balancing effect. This effectively avoids shear impact on the first load bearing and improves its service life.

[0016] Similarly, when the driven roller on the right hub bears a load, the second load bearing rolls against the outer wall of the support shaft, and the first load bearing aligns with the first longitudinal section. This indicates that when the driven roller on the right bears a load, the second load bearing ensures the support effect on the support shaft. At the same time, the first load bearing is separated from the support shaft and does not provide support. Furthermore, since the distance from the second load bearing on the left to the right hub is the same as the distance from the second load bearing on the right to the right hub, when the driven roller on the right bears a load, the distance from the support point of the second load bearing on both sides to the load center is equal, achieving a balancing effect. This effectively avoids shear impact on the second load bearing and improves its service life.

[0017] The number of first load bearings on each first bearing module is the same as the number of driven rollers on a single-layer hub. The number of first longitudinal sections on the left side is the same as the number of first longitudinal sections on the right side, and both are equal to the number of driven rollers on a single-layer hub. The sum of the central angles corresponding to all first longitudinal sections is 360°, which ensures that the first load bearings support the support shaft when any driven roller on the left hub bears the load.

[0018] The number of second load bearings on each second bearing module is the same as the number of driven rollers on the single-layer hub. The number of second longitudinal sections on the left side is the same as the number of second longitudinal sections on the right side, and both are equal to the number of driven rollers on the single-layer hub. The sum of the central angles corresponding to all the second longitudinal sections is 360°, which ensures that the second load bearings can support the support shaft when any driven roller on the right side hub bears the load.

[0019] The outer wall of the support shaft is uniformly coated with a wear-resistant coating, which can effectively prevent slippage and wear between the support shaft and the first and second load bearings, thereby improving service life. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention;

[0021] Figure 2 This is a partial structural diagram of one state of the present invention;

[0022] Figure 3 This is a schematic diagram of a partially disassembled structure in another state of the present invention.

[0023] In the figure, 1. Double-layer omnidirectional wheel; 2. Hub; 3. Driven roller; 4. Support shaft; 5. Support base; 6. Mounting through hole; 7. First load bearing; 8. Bearing A seat; 9. First longitudinal section; 10. Second load bearing; 11. Bearing B seat; 12. Second longitudinal section; 13. Split base; 14. Shock absorption mechanism. Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0025] like Figure 1As shown, the high-load anti-shear omnidirectional wheel bearing assembly includes a double-layer omnidirectional wheel 1, which includes two hubs 2. Each hub 2 has driven rollers 3 evenly distributed along the circumference. The driven rollers 3 on the two hubs 2 are arranged alternately. A support shaft 4 is coaxially fixed through the middle of the double-layer omnidirectional wheel 1. The support shaft 4 is arranged along the left and right directions. Support bases 5 are respectively provided at the left and right ends of the support shaft 4. Mounting through holes 6 are opened on the support bases 5 along the left and right directions. The mounting through holes 6 are coaxially sleeved on the outside of the support shaft 4. A first bearing module is provided on the left side inside the mounting through hole 6, and a second bearing module is provided on the right side inside the mounting through hole 6.

[0026] When the driven roller 3 of the double-layer omnidirectional wheel alternately touches the ground, the support shaft 4 alternately contacts the first bearing module and the second bearing module;

[0027] The first bearing module includes first load bearings 7 evenly distributed circumferentially around the periphery of the support shaft 4; the first load bearings 7 are connected to the support base 5 through bearing housing A 8; the outer wall of the first load bearing 7 rolls in correspondence with the outer wall of the support shaft 4; the number of first load bearings 7 on each first bearing module is the same as the number of driven rollers 3 on the single-layer hub 2; the distance from the left first load bearing 7 to the left hub 2 is the same as the distance from the right first load bearing 7 to the left hub 2; first longitudinal sections 9 are evenly distributed circumferentially on the left and right sides of the support shaft 4; the number of first longitudinal sections 9 on the left and the right is the same, and both are equal to the number of driven rollers 3 on the single-layer hub 2; the sum of the central angles corresponding to all the first longitudinal sections 9 is 360°.

[0028] The second bearing module includes second load bearings 10 evenly distributed around the periphery of the support shaft 4 in the circumferential direction; the second load bearings 10 are connected to the support base 5 through bearing seats 11; the outer wall of the second load bearings 10 rolls in correspondence with the outer wall of the support shaft 4; the number of second load bearings 10 on each second bearing module is the same as the number of driven rollers 3 on the single-layer hub 2; the distance from the left second load bearing 10 to the right hub 2 is the same as the distance from the right second load bearing 10 to the right hub 2; second longitudinal sections 12 are evenly distributed around the left and right sides of the support shaft 4 in the circumferential direction; the number of second longitudinal sections 12 on the left side is the same as the number of second longitudinal sections 12 on the right side, and both are equal to the number of driven rollers 3 on the single-layer hub 2; the sum of the central angles corresponding to all the second longitudinal sections 12 is 360°.

[0029] When the driven roller 3 on the left hub 2 bears a load, the first load bearing 7 rolls and rubs against the outer wall of the support shaft 4, and the second load bearing 10 is aligned with the second longitudinal section 12; when the driven roller 3 on the right hub 2 bears a load, the second load bearing 10 rolls and rubs against the outer wall of the support shaft 4, and the first load bearing 7 is aligned with the first longitudinal section 9; the outer wall of the support shaft 4 is uniformly coated with a wear-resistant coating.

[0030] like Figure 2 As shown, the first load bearing 7 and the second load bearing 10, which are located in the same support base 5, correspond one-to-one in the left and right directions; the first longitudinal section 9 and the second longitudinal section 12, which are located at the same end of the support shaft 4, are staggered in sequence.

[0031] like Figure 3 As shown, the first load bearing 7 and the second load bearing 10, which are located in the same support base 5, are staggered in sequence; the first longitudinal section 9 and the second longitudinal section 12, which are located at the same end of the support shaft 4, correspond one-to-one in the left and right directions.

[0032] In this technical solution, when the load-bearing point shifts to the driven roller 3 on the left hub 2, the first load bearing 7 and the support shaft 4 generate supporting rolling, while the second load bearing 10 separates from the support shaft 4. At this time, the support point of the support shaft 4 falls on the first load bearings 7 on both the left and right sides. In addition, the distance from the left first load bearing 7 to the left hub 2 is set to be the same as the distance from the right first load bearing 7 to the left hub 2, so that the first load bearings 7 on both sides can achieve balanced load distribution, effectively avoiding the problem of shear impact on the first load bearing 7. Similarly, when the load-bearing point shifts to the driven roller 3 on the right hub 2, the second load bearing 10 will generate supporting rolling with the support shaft 4, while the first load bearing 7 separates from the support shaft 4. At this time, the second load bearings 10 on both sides achieve balanced load distribution, also avoiding the problem of shear impact on the second load bearing 10.

[0033] Through the above process, when the double-layer omnidirectional wheel 1 is subjected to high loads during rotation, causing the load center to shift back and forth, the corresponding changes in the support points can effectively balance the force, solve the shear impact problem, and improve the service life of the first bearing module and the second bearing module.

[0034] The reason for setting the number of first longitudinal sections 9 on the left and right sides to be the same, and both equal to the number of driven rollers 3 on the single-layer hub 2, and for making the sum of the central angles corresponding to all first longitudinal sections 9 360°, is to ensure that the first load bearing 7 is aligned with the arc portion on the support shaft 4 when the load position changes to any driven roller 3 on the left hub 2, and to ensure that the first load bearing 7 is aligned with the first longitudinal section 9 when the load position changes to any driven roller 3 on the right hub 2. Similarly, the corresponding setting of the second longitudinal section 12 is to ensure that the second load bearing 10 is aligned with the arc portion on the support shaft 4 when the load position changes to any driven roller 3 on the right hub 2, and to ensure that the second load bearing 10 is aligned with the second longitudinal section 12 when the load position changes to any driven roller 3 on the left hub 2.

[0035] In this technical solution, the rotational power of the support shaft 4 can be provided by an external power mechanism. By distributing and installing multiple of these bearing assemblies, an all-around mobile platform can be formed. When transporting high-load objects, this effectively solves the damage caused by shearing impact to the bearing components and enhances operational reliability. The outer wall of the support shaft 4 is uniformly coated with a wear-resistant coating to enhance the friction between the support shaft 4 and the first and second bearing modules, effectively preventing slippage. The wear-resistant coating can be made of materials such as nickel-chromium alloy, tungsten carbide alloy, or ceramic.

[0036] Example 1: Because when the first load bearing 7 is aligned with the arc-shaped portion of the support shaft 4 (that is, not aligned with the first longitudinal section 9), the second load bearing 10 needs to be aligned with the second longitudinal section 12, and vice versa. Therefore, in this example, the first load bearing 7 and the second load bearing 10 are arranged in an aligned distribution, while the first longitudinal section 9 and the second longitudinal section 12 are staggered, as shown below. Figure 2 As shown.

[0037] Example 2: Figure 3 As shown, the difference between this embodiment and Embodiment 1 is that the first load bearing 7 and the second load bearing 10 are arranged in an alternating manner, while the first longitudinal section 9 and the second longitudinal section 12 are aligned, which also meets the requirements of this bearing assembly during operation. More importantly, for heavy loads requiring vibration damping, in this embodiment, the support base 5 can be configured as follows: Figure 3 As shown, the first bearing module and the second bearing module are used as two independent split bases. Each split base 13 is equipped with an independent damping mechanism 14, such as a spring damping mechanism. In this way, the damping mechanisms are also used in pairs to alternately play the damping role. The two damping mechanisms that are symmetrical about the center of gravity can be compressed at the same time with equal weight, which reduces the shear force of axial sway on the damping and improves the damping effect.

Claims

1. A high-load, shear-resistant omnidirectional wheel bearing assembly, comprising a double-layer omnidirectional wheel (1), the double-layer omnidirectional wheel (1) comprising two layers of hubs (2), each layer of hub (2) having driven rollers (3) evenly distributed circumferentially, the driven rollers (3) on the two layers of hubs (2) being arranged alternately, characterized in that: A support shaft (4) is coaxially fixed through the middle of the double-layer omnidirectional wheel (1); the support shaft (4) is arranged in the left and right direction; support bases (5) are respectively arranged at the left and right ends of the support shaft (4); mounting through holes (6) are opened on the support bases (5) in the left and right direction; the mounting through holes (6) are coaxially sleeved on the outside of the support shaft (4); a first bearing module is arranged on the left side inside the mounting through hole (6), and a second bearing module is arranged on the right side inside the mounting through hole (6); when the driven roller (3) of the double-layer omnidirectional wheel alternately touches the ground, the support shaft (4) alternately contacts the first bearing module and the second bearing module; The first bearing module includes first load bearings (7) evenly distributed around the periphery of the support shaft (4) in the circumferential direction; the first load bearings (7) are connected to the support base (5) through bearing seat A (8); the outer wall of the first load bearing (7) rolls in correspondence with the outer wall of the support shaft (4); the number of first load bearings (7) on each first bearing module is the same as the number of driven rollers (3) on the single-layer hub (2); the distance from the left first load bearing (7) to the left hub (2) is the same as the distance from the right first load bearing (7) to the left hub (2); the left and right sides of the support shaft (4) are evenly distributed with first longitudinal sections (9) in the circumferential direction; the number of first longitudinal sections (9) on the left side is the same as the number of first longitudinal sections (9) on the right side, and both are equal to the number of driven rollers (3) on the single-layer hub (2); the sum of the central angles corresponding to all the first longitudinal sections (9) is 360°; The second bearing module includes second load bearings (10) evenly distributed around the periphery of the support shaft (4) in the circumferential direction; the second load bearings (10) are connected to the support base (5) through bearing seat B (11); the outer wall of the second load bearing (10) rolls in correspondence with the outer wall of the support shaft (4); the number of second load bearings (10) on each second bearing module is the same as the number of driven rollers (3) on the single-layer hub (2); the distance from the left second load bearing (10) to the right hub (2) is the same as the distance from the right second load bearing (10) to the right hub (2); the left and right sides of the support shaft (4) are evenly distributed with second longitudinal sections (12) in the circumferential direction; the number of second longitudinal sections (12) on the left side is the same as the number of second longitudinal sections (12) on the right side, and both are equal to the number of driven rollers (3) on the single-layer hub (2); the sum of the central angles corresponding to all the second longitudinal sections (12) is 360°; When the driven roller (3) on the left hub (2) bears the load, the first load bearing (7) rolls and rubs against the outer wall of the support shaft (4), and the second load bearing (10) is aligned with the second longitudinal section (12); when the driven roller (3) on the right hub (2) bears the load, the second load bearing (10) rolls and rubs against the outer wall of the support shaft (4), and the first load bearing (7) is aligned with the first longitudinal section (9).

2. The high-load shear-resistant omnidirectional wheel bearing assembly according to claim 1, characterized in that: The outer wall of the support shaft (4) is uniformly coated with a wear-resistant coating.

3. The high-load shear-resistant omnidirectional wheel bearing assembly according to claim 2, characterized in that: The first load bearing (7) and the second load bearing (10) located in the same support base (5) correspond one-to-one in the left and right directions; the first longitudinal section (9) and the second longitudinal section (12) located at the same end of the support shaft (4) are staggered in sequence.

4. The high-load shear-resistant omnidirectional wheel bearing assembly according to claim 2, characterized in that: The first load bearing (7) and the second load bearing (10) located in the same support base (5) are staggered in sequence; the first longitudinal section (9) and the second longitudinal section (12) located at the same end of the support shaft (4) correspond one-to-one in the left and right directions.

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