Hub bracket and omnidirectional wheel

Abstract

The utility model discloses a hub support and an omnidirectional wheel, and belongs to the technical field of omnidirectional wheels. The hub support comprises a wheel disc, a plurality of installation grooves circumferentially formed in the wheel disc and a center shaft sleeve, the installation grooves form an insertion type assembly structure, the opening ends of the installation grooves extend to the edge of the wheel disc and are provided with guide parts, and the extension direction of the guide parts is consistent with the insertion direction of a roller support. A first mounting part and a second mounting part are arranged in the mounting groove in the inserting direction at intervals, the first mounting part is arranged close to the opening end of the mounting groove, the second mounting part is arranged close to the bottom of the mounting groove, and the first mounting part and the second mounting part cooperate to form multiple positioning of the roller support. According to the utility model, the bearing capacity of the hub bracket can be better improved, the assembly precision of the roller bracket is ensured through multiple positioning, and the movement smoothness of the omnidirectional wheel is ensured.

Description

Technical Field

[0001] This utility model relates to the field of omnidirectional wheel technology, and in particular to a wheel hub bracket and an omnidirectional wheel. Background Technology

[0002] An omnidirectional wheel is a special wheel structure that enables free movement in multiple directions. Its core feature lies in the multiple circumferentially distributed driven roller assemblies, which allow the wheel to move smoothly in any direction, such as laterally or diagonally, while maintaining the main drive rotation. This wheel structure is widely used in AGVs, robots, precision logistics equipment, and other fields, and is especially suitable for flexible steering and precise positioning in confined spaces.

[0003] The wheel hub bracket is the core support structure for the multi-degree-of-freedom motion of an omnidirectional wheel, directly determining its mechanical performance, motion accuracy, and service life. The wheel hub bracket is rigidly connected to the drive shaft via a central bushing, evenly transmitting the rotational torque output by the motor to the roller assemblies distributed around the wheel's circumference. The load-bearing capacity of the wheel hub bracket determines the torque transmission efficiency. Insufficient load-bearing capacity will lead to asynchronous rotation of the roller assemblies.

[0004] The core characteristic of an omnidirectional wheel is that it achieves lateral sliding through the free rotation of the roller assembly. The wheel hub bracket needs to synchronously coordinate the passive rotation direction of each roller assembly when the drive shaft rotates in the forward direction. Therefore, ensuring the assembly accuracy of the roller assembly is crucial for achieving smooth omnidirectional wheel movement, and this assembly accuracy is typically guaranteed by the wheel hub bracket.

[0005] A search revealed patent publication number CN219007486U, which discloses an omnidirectional wheel and a mobile device using an omnidirectional wheel. The omnidirectional wheel of this application includes a bearing assembly, a first cage, a second cage, multiple first wheel sets, and multiple second wheel sets. The first cage is fitted onto the bearing assembly, and the first and second wheel sets are arranged at intervals on the outer periphery of the first cage, forming the circumcircle of the omnidirectional wheel. Although this application also provides two mounting holes in the longitudinal part of the T-shaped structure of the second cage to connect with the first cage, achieving two-point support, the omnidirectional wheel of this application is prone to accumulating circumferential assembly deviations during assembly, affecting the smoothness of the omnidirectional wheel's movement. Utility Model Content

[0006] 1. Technical problem to be solved by the utility model

[0007] In view of the technical problems existing in the prior art wheel hub bracket, the present invention provides a wheel hub bracket and an omnidirectional wheel. The present invention can better improve the load-bearing capacity of the wheel hub bracket and ensure the assembly accuracy of the roller bracket through multiple positioning, thus ensuring the smooth movement of the omnidirectional wheel.

[0008] 2. Technical Solution

[0009] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0010] As a first aspect of this utility model, a wheel hub bracket includes a wheel disc, a plurality of mounting slots circumferentially disposed on the wheel disc, and a central bushing. The mounting slots form an insertion assembly structure, and the open end of the mounting slot extends to the edge of the wheel disc and is provided with a guide portion. The extension direction of the guide portion is consistent with the insertion direction of the wheel bracket. A first mounting portion and a second mounting portion are arranged at intervals along the insertion direction in the mounting slot. The first mounting portion is disposed near the open end of the mounting slot, and the second mounting portion is disposed near the bottom of the mounting slot. The first mounting portion and the second mounting portion cooperate to form multiple positioning of the wheel bracket.

[0011] Furthermore, the guide portion is a chamfer that tapers inward from the opening end of the mounting slot, and the angle of this chamfer matches the profile of the connecting arm of the roller bracket.

[0012] Furthermore, the side wall of the mounting groove is provided with a stepped positioning surface, which is in clearance fit with the side of the connecting arm of the roller bracket; the stepped positioning surface includes a first stepped surface and a second stepped surface distributed sequentially along the insertion direction, and the first stepped surface and the second stepped surface together constitute a progressive multi-directional positioning of the connecting arm.

[0013] Furthermore, the wheel is provided with a transverse support beam and a longitudinal support beam, the transverse support beam and the longitudinal support beam intersect to form a grid-like reinforcing structure, and the surface of the transverse support beam is provided with an arc-shaped transition surface that connects with the side wall of the mounting groove.

[0014] Furthermore, the depth of the mounting groove is greater than the thickness of the wheel, and the mounting groove forms a three-dimensional enclosure for the roller bracket connecting arm inserted therein.

[0015] Furthermore, the first mounting portion and the second mounting portion are spaced apart on the bottom plate of the mounting groove, and the first mounting portion and the second mounting portion are threaded holes.

[0016] Furthermore, the central bushing is interference-fitted with the wheel, and a central bearing is provided inside the central bushing.

[0017] As a second aspect of this utility model, an omnidirectional wheel includes a roller bracket, a first roller assembly, a second roller assembly, and a hub bracket; the roller bracket includes a first connecting arm and a second connecting arm, the first connecting arm is inserted into a mounting groove and connected to a first mounting part and a second mounting part respectively by a first fastener and a second fastener, and the second connecting arm extends to the outside of the mounting groove and is rotatably connected to the first roller assembly and the second roller assembly.

[0018] Furthermore, the first connecting arm of the roller bracket is provided with a first fixing hole and a second fixing hole. The first fixing hole is connected to the first mounting part by a first fastener, and the second fixing hole is connected to the second mounting part by a second fastener.

[0019] Furthermore, the first fastener is a high-strength bolt, the second fastener is an anti-loosening bolt, and the axial direction of both is parallel to the wheel disc axis.

[0020] 3. Beneficial effects

[0021] Compared with existing known technologies, the technical solution provided by this utility model has the following significant advantages:

[0022] (1) A hub bracket of the present invention has an insertion assembly structure in which the mounting groove is provided. The first mounting part and the second mounting part are spaced apart on the bottom plate of the mounting groove to form the axial positioning surface of the roller bracket. The side wall of the mounting groove forms the radial constraint surface of the roller bracket. At the same time, the opening end of the mounting groove is provided with a chamfer. Through the multi-dimensional positioning of axial positioning surface + radial constraint + pre-guided chamfer, the precision assembly of the roller bracket is realized, the cumulative error of multi-part nested assembly of omnidirectional wheel is reduced, the assembly efficiency is improved while ensuring the smooth movement of omnidirectional wheel.

[0023] (2) The hub bracket of this utility model has a chamfered mounting groove and a stepped side wall forming a mechanical limit, which converts the shear load borne by the roller bracket into a safe stress, reduces thread engagement wear and lateral impact damage, and can significantly extend the service life of the fastener.

[0024] (3) The omnidirectional wheel of this utility model reduces the shear stress on the fasteners through the dual-point layout design of the first fastener + the second fastener, effectively suppresses the lateral displacement of the roller bracket, enhances the fatigue resistance of the threaded connection structure, eliminates the risk of thread stripping caused by traditional single-point fixing, and improves the load-bearing reliability of the omnidirectional wheel. Attached Figure Description

[0025] Figure 1 A three-dimensional structural schematic diagram of a wheel hub bracket provided in an embodiment of the present utility model;

[0026] Figure 2 for Figure 1 A magnified view of a section at point A in the middle;

[0027] Figure 3 for Figure 1 A magnified view of a section at point B in the middle;

[0028] Figure 4 This is a schematic diagram showing the connection between the roller bracket and the hub bracket according to an embodiment of the present invention;

[0029] Figure 5 A three-dimensional structural diagram of an omnidirectional wheel provided in an embodiment of the present utility model;

[0030] Figure 6 This is a schematic diagram of the structure of a roller module provided in one embodiment of the present invention.

[0031] Explanation of the labels in the diagram:

[0032] 1. Hub bracket; 11. Wheel disc; 111. Transverse support beam; 112. Longitudinal support beam; 12. Mounting groove; 121. Base plate; 122. First mounting part; 123. Second mounting part; 124. Chamfer; 125. Side wall; 1251. First stepped surface; 1252. Second stepped surface; 13. Central bushing;

[0033] 2. Roller bracket; 21. First connecting arm; 211. First fixing hole; 212. Second fixing hole; 22. Second connecting arm; 23. First fastener; 24. Second fastener;

[0034] 3. First roller assembly; 4. Second roller assembly; 5. Center bearing. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0036] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0037] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0038] Example 1

[0039] Traditional omnidirectional wheels often use a single bolt to fix the roller bracket to the hub. Under heavy loads or impact conditions, the shear stress concentration on the bolt can easily lead to thread stripping and fatigue failure of the connection structure. Furthermore, the nested assembly of the roller bracket and hub lacks a positioning reference, and accumulated errors can easily cause roller wobble, affecting the smoothness of movement. The lack of mechanical restraint on the lateral displacement of the roller bracket, coupled with the bolt's long-term exposure to alternating shear loads, shortens the lifespan of the connection structure.

[0040] Focusing on the above issues, and combining Figure 1 This embodiment provides a wheel hub bracket, including a wheel disc 11, a plurality of mounting slots 12 circumferentially disposed on the wheel disc 11, and a central bushing 13. The wheel disc 11 is provided with a transverse support beam 111 and a longitudinal support beam 112, the transverse support beam 111 and the longitudinal support beam 112 intersecting to form a grid-like reinforcing structure; the surface of the transverse support beam 111 is provided with an arc-shaped transition surface that connects with the sidewall 125 of the mounting slot 12. The central bushing 13 of the wheel hub bracket 1 is interference-fitted with the wheel disc 11, and a central bearing 5 is disposed inside the central bushing 13. The drive shaft of the moving device drives the entire omnidirectional wheel to rotate through the central bearing 5.

[0041] The wheel 11 is provided with a plurality of mounting grooves 12 around its circumference. The depth of the mounting grooves 12 is greater than the thickness of the wheel 11. The mounting grooves 12 not only form an insert-type assembly structure for the roller bracket 2, but also form a three-dimensional wrap around the connecting arm of the roller bracket 2 inserted therein.

[0042] The open end of the mounting groove 12 extends to the edge of the wheel 11 and is provided with a guide portion. The extending direction of the guide portion is consistent with the insertion direction of the roller bracket 2. Figure 2 and Figure 3 In this embodiment, the guide portion is a chamfer 124 that gradually narrows inward from the opening end of the mounting groove 12, and the inclination angle of the chamfer 124 matches the contour of the connecting arm of the roller bracket 2.

[0043] The mounting groove 12 contains a first mounting portion 122 and a second mounting portion 123 spaced apart along the insertion direction. The first mounting portion 122 and the second mounting portion 123 are spaced apart on the bottom plate 121 of the mounting groove 12. The first mounting portion 122 is positioned near the opening end of the mounting groove 12, and the second mounting portion 123 is positioned near the bottom of the mounting groove 12. The first mounting portion 122 and the second mounting portion 123 work together to provide multiple positioning for the roller bracket 2. In this embodiment, the first mounting portion 122 and the second mounting portion 123 are threaded holes.

[0044] The side wall 125 of the mounting groove 12 is provided with a stepped positioning surface, which is in clearance fit with the side of the connecting arm of the roller bracket 2; the stepped positioning surface includes a first stepped surface 1251 and a second stepped surface 1252 distributed sequentially along the insertion direction, and the first stepped surface 1251 and the second stepped surface 1252 together constitute a progressive multi-directional positioning of the connecting arm.

[0045] It is worth noting that this embodiment implements an axial-radial dual positioning structure in the mounting groove 12. The first mounting part 122, the second mounting part 123, and the stepped multi-directional limiting surface of the side wall 125 in the mounting groove 12 form complementary constraints, eliminating the deflection degree of freedom of the roller bracket 2 during the assembly process and ensuring the parallelism of the axes and the consistency of the circumferential distribution of multiple roller assemblies. The progressive guiding design of the chamfer 124 automatically corrects the assembly angle deviation during insertion, avoiding repeated manual adjustments, and is especially suitable for rapid assembly.

[0046] The grid-like intersecting design of the transverse support beam 111 and the longitudinal support beam 112, along with the three-dimensional wrapping layout of the mounting groove, disperses the lateral impact force of the roller assembly to the overall structure of the wheel disk 11, significantly reducing the risk of local stress concentration. Furthermore, the arc-shaped transition and concave-convex reinforcement structure of the transverse support beam 111 and the longitudinal support beam 112 increase local compressive strength with the same amount of material, meeting the dual requirements of lightweight and high load-bearing capacity.

[0047] Example 2

[0048] Combination Figures 4-6 An omnidirectional wheel according to this embodiment includes a hub bracket 1, a roller bracket 2, a plurality of first roller assemblies 3 and a plurality of second roller assemblies 4. The first roller assembly 3 is rotatably mounted on a single roller bracket 2, and the second roller assembly 4 is rotatably mounted between two adjacent roller brackets 2.

[0049] Adjacent first roller assembly 3, second roller assembly 4, and single roller bracket 2 form, as shown in the figure Figure 6 The roller module shown has multiple roller modules arranged in a circular structure along the circumference of the hub bracket 1. That is, the first roller assembly 3 and the second roller assembly 4 are connected to the hub bracket 1 via the roller bracket 2, and the first roller assembly 3 and the second roller assembly 4 are arranged alternately along the circumference of the hub bracket 1, working together as shown... Figure 5 The diagram shows a complete circular roller structure.

[0050] The roller bracket 2 includes a first connecting arm 21 and a second connecting arm 22. The first connecting arm 21 has a first fixing hole 211 and a second fixing hole 212. The first connecting arm 21 is inserted into the mounting groove 12. The first fixing hole 211 is connected to the first mounting part 122 by a first fastener 23, and the second fixing hole 212 is connected to the second mounting part 123 by a second fastener 24. The first fastener 23 is a high-strength bolt, and the second fastener 24 is an anti-loosening bolt, and the axis of both is parallel to the axial direction of the wheel 11. The second connecting arm 22 extends to the outside of the mounting groove 12 and is rotatably connected to the first roller assembly 3 and the second roller assembly 4.

[0051] Omnidirectional wheels bear multi-directional alternating loads under complex road conditions, and traditional single-bolt fixing is prone to thread stripping due to stress concentration. This embodiment uses a dual-point positioning system with a first mounting part 122 and a second mounting part 123. The first mounting part 122 uses high-strength bolts for primary fixing, while the second mounting part 123 uses anti-loosening bolts for auxiliary constraint. This dual-point layout reduces the peak shear stress of the bolts, effectively preventing lateral displacement of the roller bracket 2 during sharp turns. This structure significantly improves the fatigue life of the bolts.

[0052] To address the challenge of assembling multiple nested components of the omnidirectional wheel, this embodiment employs a triple positioning system in the mounting groove 12. The base plate 121 features a first mounting portion 122 and a second mounting portion 123 providing an axial reference surface, while the sidewall 125 forms a radial constraint. A chamfer 124 provides pre-guidance, improving the assembly accuracy of the roller bracket 2. The chamfer 124 and the stepped sidewall 125 create a dual mechanical limit, transforming the bolt shear load in traditional structures into structural safety stress. When the omnidirectional wheel experiences lateral impact, the shear force on the bolts is significantly reduced. Simultaneously, the stress-buffering design of the chamfer 124 reduces thread wear. Furthermore, the grid structure formed by the transverse support beam 111 and the longitudinal support beam 112 enhances the overall bending stiffness of the omnidirectional wheel, while the interference fit design of the central bushing 13 ensures transmission accuracy.

[0053] The entire omnidirectional wheel structure disperses shear stress through double fasteners, and the stepped sidewalls and chamfers form mechanical limits. The grid support beams enhance the overall rigidity, effectively solving the problem of easy damage to the connection structure of traditional omnidirectional wheels under high loads.

[0054] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A wheel hub bracket, characterized in that: The device includes a wheel (11), multiple mounting slots (12) circumferentially disposed on the wheel (11), and a central bushing (13). The mounting slots (12) form an insert-type assembly structure. The open end of the mounting slot (12) extends to the edge of the wheel (11) and is provided with a guide portion. The extension direction of the guide portion is consistent with the insertion direction of the roller bracket (2). A first mounting portion (122) and a second mounting portion (123) are arranged at intervals along the insertion direction in the mounting slot (12). The first mounting portion (122) is disposed near the open end of the mounting slot (12), and the second mounting portion (123) is disposed near the bottom of the mounting slot (12). The first mounting portion (122) and the second mounting portion (123) work together to form multiple positioning of the roller bracket (2).

2. The hub bracket according to claim 1, characterized in that: The guide portion is a chamfer (124) that tapers inward from the opening end of the mounting groove (12), and the inclination angle of the chamfer (124) matches the profile of the connecting arm of the roller bracket (2).

3. A hub bracket according to claim 1 or 2, characterized in that: The side wall (125) of the mounting groove (12) is provided with a stepped positioning surface, which is in clearance fit with the side of the connecting arm of the roller bracket (2); the stepped positioning surface includes a first stepped surface (1251) and a second stepped surface (1252) distributed sequentially along the insertion direction, and the first stepped surface (1251) and the second stepped surface (1252) together constitute a progressive multi-directional positioning of the connecting arm.

4. A hub bracket according to claim 1, characterized in that: The wheel (11) is provided with a transverse support beam (111) and a longitudinal support beam (112). The transverse support beam (111) and the longitudinal support beam (112) intersect to form a grid-like reinforcing structure. The surface of the transverse support beam (111) is provided with an arc-shaped transition surface that connects with the side wall (125) of the mounting groove (12).

5. A hub bracket according to claim 1, characterized in that: The depth of the mounting groove (12) is greater than the thickness of the wheel disc (11), and the mounting groove (12) forms a three-dimensional wrap around the connecting arm of the roller bracket (2) inserted therein.

6. A hub bracket according to claim 1, characterized in that: The first mounting part (122) and the second mounting part (123) are spaced apart on the bottom plate (121) of the mounting groove (12), and the first mounting part (122) and the second mounting part (123) are threaded holes.

7. A hub bracket according to claim 1, characterized in that: The central bushing (13) is interference-fitted with the wheel (11), and a central bearing (5) is provided inside the central bushing (13).

8. An omnidirectional wheel, characterized in that: The device includes a roller bracket (2), a first roller assembly (3), a second roller assembly (4), and a hub bracket (1) as described in any one of claims 1-7; the roller bracket (2) includes a first connecting arm (21) and a second connecting arm (22), the first connecting arm (21) is inserted into a mounting groove (12) and connected to a first mounting part (122) and a second mounting part (123) respectively by a first fastener (23) and a second fastener (24), and the second connecting arm (22) extends to the outside of the mounting groove (12) and is rotatably connected to the first roller assembly (3) and the second roller assembly (4).

9. An omnidirectional wheel according to claim 8, characterized in that: The first connecting arm (21) of the roller bracket (2) is provided with a first fixing hole (211) and a second fixing hole (212). The first fixing hole (211) is connected to the first mounting part (122) by a first fastener (23), and the second fixing hole (212) is connected to the second mounting part (123) by a second fastener (24).

10. An omnidirectional wheel according to claim 8 or 9, characterized in that: The first fastener (23) is a high-strength bolt, and the second fastener (24) is an anti-loosening bolt, and the axial direction of both is parallel to the axial direction of the wheel (11).

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