A method for manufacturing a wheel hub and a method for manufacturing an omnidirectional wheel

Abstract

The present invention belongs to the field of mobile wheel manufacturing, and in particular, relates to a manufacturing method of a wheel hub and an omnidirectional wheel. The manufacturing method of the wheel hub includes the following steps: preparing two wheel bodies, preparing a first forming mold, placing a first forming material in a first forming cavity, heating the first forming mold to a first predetermined temperature and keeping the temperature within a first predetermined time; preparing supporting teeth, preparing supporting teeth with a second forming material; assembling, installing a plurality of supporting teeth at intervals on the circumferential side surface of each wheel body; strengthening, coating the surface of each supporting tooth with a first reinforcing layer, coating the surface of each wheel body with a second reinforcing layer, and forming the first reinforcing layer and the second reinforcing layer in one piece. The present invention can simplify the structure of the wheel hub of the omnidirectional wheel and reduce its weight.

Description

Technical Field

[0001] The invention belongs to the field of mobile wheel manufacturing, and in particular relates to a manufacturing method of a wheel hub and a manufacturing method of an omnidirectional wheel. Background Art

[0002] At present, with the improvement of industrial design level, the functionality and integration of wheelchairs are getting higher and higher. For example, some wheelchairs have tried to drive directly into the toilet and directly connect with the toilet, which further improves the user's self-care ability. However, common electric wheelchairs generally achieve steering function through the matching universal wheel design, and their swing is random. When the wheelchair is poured into the toilet, it is easy to scratch due to the close width of the toilet and the wheelchair. When the wheelchair is switched in and out, the universal wheelchair is easy to directly touch the toilet because it needs to be adjusted at a large angle. Therefore, this type of wheelchair product urgently needs to introduce a suitable new steering wheel.

[0003] The omnidirectional wheel includes a hub and a driven wheel, wherein the hub has the same function as the ordinary hub and has the ability to roll forward and backward; and the driven wheel on the omnidirectional wheel gives the omnidirectional wheel additional lateral movement ability. Therefore, the omnidirectional wheel can realize a variety of steering functions without conventional swinging, and can turn quickly and flexibly on the spot, getting rid of the hysteresis self-adjustment requirements of conventional universal wheels. It has been gradually applied in fields such as robots, and is also an optimal solution for solving the fine control field such as wheelchair pouring into the toilet. Since support teeth are arranged between each driven wheel of the single-row omnidirectional wheel unit, adjacent driven wheels are discontinuous, resulting in the single-row omnidirectional wheel unit cannot ensure that the driven wheel is always in rolling contact with the ground, and it is easy to generate large vibrations when rolling. Therefore, the omnidirectional wheel usually adopts a multi-row structure, that is, multiple groups of omnidirectional wheel units are arranged axially, and the driven wheel groups installed on the multiple groups of hubs are arranged in a radially staggered manner, so as to ensure that during the rolling process of the omnidirectional wheel, at least one driven wheel is always in rolling contact with the ground, thereby reducing vibration.

[0004] However, most omnidirectional wheels are currently assembled through a series of complex processes such as piecing together, interlocking, and stacking multiple plates. The wheel hub usually contains multiple sets of flange structures, which need to be connected by multiple sets of bolts and nuts, and the two wheel hubs need to be assembled through connectors. Such a structure is complex and has poor reliability and is heavy. In addition, traditional omnidirectional wheels are usually made of materials such as aluminum alloy or alloy steel, which further increases their weight. Summary of the invention

[0005] The purpose of the embodiments of the present application is to provide a method for manufacturing a wheel hub and a method for manufacturing an omnidirectional wheel, aiming to solve the problem of how to simplify the structure of the wheel hub and reduce its weight.

[0006] To achieve the above-mentioned purpose, the technical solution adopted in the present application is: to provide a method for manufacturing a wheel hub, for preparing the wheel hub, wherein the wheel hub comprises supporting teeth and two wheel bodies stacked and connected to each other, and a plurality of supporting teeth are arranged at intervals on the circumferential side surface of each wheel body, characterized in that the method for manufacturing the wheel hub comprises the following steps:

[0007] preparing a first forming material and a second forming material;

[0008] Prepare the two wheel bodies, prepare a first forming mold, the first forming mold has a first forming cavity for forming the two wheel bodies, place the first forming material in the first forming cavity, heat the first forming mold to a first predetermined temperature and keep it warm for a first predetermined time;

[0009] preparing the supporting tooth, using the second forming material to prepare the supporting tooth;

[0010] Assembling, a plurality of the supporting teeth are installed at intervals on the peripheral side surface of each wheel body;

[0011] Strengthening: a first reinforcement layer is coated on the surface of each supporting tooth, and a second reinforcement layer is coated on the surface of each wheel body, and the first reinforcement layer and the second reinforcement layer are integrally formed.

[0012] In one embodiment, the first predetermined temperature ranges from 100 to 120° C., and the first predetermined time ranges from 10 to 20 minutes.

[0013] In one embodiment, the step of preparing the two wheel bodies further includes forming a center axis hole at the center position of the wheel body, the two center axis holes are connected, and the hole wall of each center axis hole is covered with the second reinforcement layer.

[0014] In one embodiment, the first forming material is a foaming material, the second forming material is a carbon fiber material, and a plurality of carbon fiber layers each made of the carbon fiber material are stacked to form the supporting teeth.

[0015] In one embodiment, the step of preparing the supporting tooth also includes forming supporting holes on both sides of the supporting tooth; the strengthening step also includes coating the inner wall of the supporting hole with a third reinforcing layer, and the first reinforcing layer, the second reinforcing layer and the third reinforcing layer are formed integrally.

[0016] The present application also provides a method for manufacturing an omnidirectional wheel, which is used to prepare an omnidirectional wheel, and is characterized by comprising the following steps:

[0017] Prepare a driven wheel and a support shaft, wherein the driven wheel has a through hole, and the support shaft passes through the through hole and is connected to the driven wheel;

[0018] preparing a wheel hub, wherein the wheel hub is prepared by the method for manufacturing a wheel hub as claimed in claim 5;

[0019] A driven wheel is installed, and a transfer groove is formed between any two adjacent supporting teeth, and the driven wheel and the supporting shaft are installed in each of the transfer grooves, and the two ends of the supporting shaft are rotatably connected to the two supporting holes respectively;

[0020] Curing, preparing a second forming mold with a second forming cavity, placing the wheel hub, each of the driven wheels and each of the support shafts in the second forming cavity, and heating the second forming mold to a second predetermined temperature and keeping it warm for a second predetermined time.

[0021] In one embodiment, the second predetermined temperature ranges from 135 to 145° C., and the second predetermined time ranges from 30 to 45 minutes.

[0022] In one embodiment, the step of installing the driven wheel also includes installing a shaft sleeve, the shaft sleeve having a closed end and an open end, the open end is covered with the support shaft, the closed end is inserted into the support hole, and the shaft sleeves are installed at both ends of the support shaft.

[0023] In one embodiment, a lubricating layer is coated inside each of the bushings.

[0024] In one embodiment, the curing step further comprises sealing a gap between the bushing and the support shaft.

[0025] The beneficial effects of the present application are: the two wheel bodies are formed in one piece without the need to use other connecting structural parts. On the one hand, a series of complicated processes such as splicing, interlocking and lamination are reduced; on the other hand, connecting structures such as bolts and nuts are not required, thereby reducing the number of components. Therefore, the present application solves the technical problem of how to simplify the structure of the hub of the omnidirectional wheel and reduce the weight of the hub. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or exemplary technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 Flow chart of the manufacturing method of the hub provided in the embodiment of the present application

[0028] Figure 2 and Figure 3 A schematic diagram of the structure of a wheel hub provided in an embodiment of the present application;

[0029] Figure 4 A flow chart of a method for manufacturing an omnidirectional wheel provided in an embodiment of the present application;

[0030] Figure 5 and Figure 6 A schematic diagram of the structure of the omnidirectional wheel provided in an embodiment of the present application;

[0031] Figure 7 for Figure 6 A cross-sectional view of the omnidirectional wheel shown along the AA direction;

[0032] Figure 8 for Figure 7 A partial enlarged view of the omnidirectional wheel B shown;

[0033] Fig. 9 for Figure 5 A perspective exploded view of the omnidirectional wheel is shown.

[0034] Among them, the reference numerals in the figure are:

[0035] 100, omnidirectional wheel; 10, wheel hub; 11, wheel body; 12, supporting teeth; 121, supporting hole; 13, adapter groove; 14, annular flange; 15, center axis hole; 16, first reinforcement layer; 17, third reinforcement layer; 18, second reinforcement layer; 20, driven wheel; 30, supporting shaft; 31, bushing; 311, open end; 312, closed end. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present application.

[0037] It should be noted that when a component is referred to as being "fixed on" or "disposed on" another component, it may be directly on the other component or indirectly on the other component. When a component is referred to as being "connected to" another component, it may be directly or indirectly connected to the other component. The orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances. The terms "first" and "second" are only used for the purpose of convenience of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. The meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0038] See also Figures 1 to 3 , the present application embodiment provides a method for manufacturing a wheel hub, for manufacturing such as Figure 2 and Figure 3 The wheel hub 10 shown in the figure includes supporting teeth 12 and two wheel bodies 11 stacked and connected to each other, and a plurality of supporting teeth 12 are arranged at intervals on the circumferential side surface of each wheel body 11, and the manufacturing method of the wheel hub includes the following steps:

[0039] S1: preparing a first forming material and a second forming material;

[0040] S2: preparing the two wheel bodies 11, preparing a first forming mold, the first forming mold having a first forming cavity for forming the two wheel bodies 11, placing the first forming material in the first forming cavity, heating the first forming mold to a first predetermined temperature and keeping the temperature for a first predetermined time;

[0041] S3: preparing the supporting tooth 12 by using the second forming material;

[0042] S4: Assembling, connecting a plurality of the supporting teeth 12 at intervals on the peripheral side surface of each wheel body 11;

[0043] S5: Strengthening: coating the surface of each supporting tooth 12 with a first reinforcement layer 16 , and coating the surface of each wheel body 11 with a second reinforcement layer 18 , wherein the first reinforcement layer 16 and the second reinforcement layer 18 are integrally formed.

[0044] The strength of the first forming material is greater than the strength of the second forming material, thereby ensuring the supporting strength of the supporting teeth 12 .

[0045] The wheel hub 10 is prepared by the above method, and the two wheel bodies 11 are integrally formed without using other connecting structural parts. On the one hand, a series of complicated processes such as splicing, interlocking and laminating are reduced; on the other hand, connecting structures such as bolts and nuts are not required, which reduces the number of components. Therefore, the present application solves the technical problem of how to simplify the structure of the wheel hub 10 of the omnidirectional wheel 100 and reduce its weight.

[0046] It is understandable that by simplifying the structure of the hub 10 and reducing its weight, the omnidirectional wheel 100 manufactured using the hub 10 can achieve the same technical effect.

[0047] It can be understood that a transfer groove 13 for installing the driven wheel 20 is formed between two adjacent supporting teeth 12. In the structure of the omnidirectional wheel 100, in order to reduce the vibration of the omnidirectional wheel 100 during rolling, the two groups of driven wheels 20 installed on the two wheel bodies 11 are staggered along the circumference of any wheel body 11. Accordingly, in this embodiment, the two groups of transfer grooves 13 located on the two wheel bodies 11 are staggered along the circumference of any wheel body 11; accordingly, in this embodiment, the two groups of supporting teeth 12 assembled on the two wheel bodies 11 are staggered along the circumference of any wheel body 11.

[0048] It is understandable that, since 3 or more odd number of driven wheels 20 need to be installed on each wheel body 11, correspondingly, each wheel body 11 has at least 3 or more odd number of adapter grooves 13, so, the number of supporting teeth 12 on the side surface of each wheel body 11 is 3 or more odd number. Optionally, in this embodiment, the number of supporting teeth 12 on the side surface of each wheel body 11 is 7.

[0049] Optionally, in this embodiment, the supporting teeth 12 on each wheel body are arranged at equal intervals around the circumference of the corresponding wheel body.

[0050] Optionally, the wheel body 11 and the plurality of supporting teeth 12 may be assembled by manual positioning, or may be assembled with the assistance of a mold or other structures with positioning and limiting functions.

[0051] It can be understood that the first reinforcement layer 16 and the second reinforcement layer 18 are integrally formed to form and wrap the wheel body 11 and the supporting teeth 12 at the same time, which can increase the strength of the outer surface of the hub 10 on the one hand, and make the connection between the wheel body 11 and the supporting teeth 12 more stable on the other hand.

[0052] Optionally, in this embodiment, the first predetermined temperature ranges from 100 to 120° C., and the first predetermined time ranges from 10 to 20 minutes.

[0053] It can be understood that, under this condition, the second forming material can be fully shaped into the wheel body 11 .

[0054] See also Figure 7 and Figure 8 Optionally, in this embodiment, the step of preparing the two wheel bodies 11 also includes forming a center axis hole 15 at the center position of the wheel body 11, the two center axis holes 15 are connected, and the hole wall of each center axis hole 15 is covered with a second reinforcement layer 18.

[0055] It can be understood that, in this embodiment, the first forming cavity includes two first annular cavities that are interconnected and coaxially stacked, and are used to form the two wheel bodies 11.

[0056] See also Figure 3Optionally, in this embodiment, an annular flange 14 is provided on the opposite surfaces of the two wheel bodies 11 , and the annular flange 14 is located at the periphery of the openings of the two central shaft holes 15 .

[0057] It is understandable that the first forming cavity further includes two second annular cavities disposed between the two first annular cavities and connected to each other. The first annular cavity and the second annular cavity are arranged axially, and the diameter of the second annular cavity is smaller than that of the first annular cavity, so as to form the wheel body 11 with the annular flange 14.

[0058] Optionally, in this embodiment, the first forming material is a foaming material, the second forming material is a carbon fiber material, and a plurality of carbon fiber layers all made of the carbon fiber material are stacked to form the supporting teeth 12 .

[0059] Optionally, in this embodiment, the step of preparing the supporting teeth includes: preparing a processing mold for preparing the supporting teeth 12, the processing mold having a processing mold cavity for forming the supporting teeth 12, stacking each carbon fiber layer in the processing mold cavity in sequence, and performing pressure molding to form the supporting teeth 12.

[0060] Optionally, in this embodiment, the step of preparing the supporting teeth includes: cutting each carbon fiber layer made of carbon fiber material into a predetermined shape, and then laying the layers in a processing mold cavity to form the supporting teeth 12 .

[0061] It is understandable that using foamed materials and carbon fiber materials instead of aluminum alloy or alloy steel materials can significantly reduce the weight of the omnidirectional wheel 100. In addition, since the modulus of carbon fiber exceeds 200GPa, and the tensile strength is generally above 3500Mpa, but the density is only 1.8g / cm3, its specific modulus and specific strength far exceed traditional materials such as aluminum alloy and alloy steel. Using carbon fiber materials to make the support teeth 12 can also increase the strength and toughness of the wheel hub 10.

[0062] It is understandable that the foaming material includes thermoplastic materials and thermosetting materials, among which the thermoplastic materials are mainly formed by physical changes and can be processed after one forming; while the thermosetting materials are mainly formed by chemical changes, usually including two foaming forming steps.

[0063] Optionally, in this embodiment, the foaming material is a thermosetting material, and the wheel hub 10 is formed after a single forming process in this step; a second foaming process is required later.

[0064] Optionally, in this embodiment, the foaming material is a high-energy rubber mixed with low-density, low-boiling-point alkanes, which has secondary foaming ability. Optionally, in this embodiment, when manufacturing the wheel hub 10, the addition amount of the high-energy rubber is calculated based on a density of 0.3 to 0.5 g / cm3. Optionally, in this embodiment, the base material of the high-energy rubber is butyl rubber with good sealing and shock-absorbing properties.

[0065] It is understandable that butyl rubber has strong molecular polarity and very good shock absorption function. When used in wheelchair products, it can effectively absorb part of the vibration energy and significantly improve the comfort of the wheelchair. At the same time, the mixed low-boiling point alkanes are quickly vaporized during the heating process, but because butyl rubber has very good air tightness, most of the gas will eventually be sealed by butyl rubber to form independent micro airbags, so that it can still have a certain strength when the density is reduced to 0.3-0.5g / cm3, especially when the wheel hub 1010 is impacted, it can play a role in buffering and strengthening.

[0066] See also Figure 7 and Figure 8 Optionally, in this embodiment, in the step of preparing the supporting teeth, it also includes forming supporting holes 121 on both sides of the supporting teeth 12; the strengthening step also includes coating the inner wall of the supporting hole 121 with a third reinforcing layer 17, and the first reinforcing layer 16, the second reinforcing layer 18 and the third reinforcing layer 17 are formed integrally.

[0067] It can be understood that the support hole 121 can be used to install the driven wheel 20 of the omnidirectional wheel 100 at the adapter groove 13 through the support shaft 30; the support hole 121 and the outer surface of the support tooth 12 are coated with a reinforcement layer, which can ensure the support strength of the support shaft 30. In addition, the first reinforcement layer 16, the second reinforcement layer 18 and the third reinforcement layer 17 are integrally formed and rigidly contacted, so that the hub 10 is wrapped to form a whole.

[0068] Optionally, in this embodiment, in the step of preparing the supporting teeth, a notch is provided in the carbon fiber layer laid in the middle of the supporting teeth 12 , and after the carbon fiber layers are laid, the notches located in multiple carbon fiber layers are superimposed to form the supporting holes 121 .

[0069] Optionally, in this embodiment, the first reinforcement layer 16 , the second reinforcement layer 18 and the third reinforcement layer 17 are all made of carbon fiber material.

[0070] It is understandable that the reinforcing layer is made of high-strength and high-modulus carbon fiber material, which is coated on various parts of the wheel hub 10 as the main mechanical bearing member; the wheel body 11 is made of low-density foamed rubber material with secondary foaming ability to assist the curing and shaping of the wheel hub 10. Compared with the traditional omnidirectional wheel 100 unit, the overall weight can be reduced by about 40 to 60%. When used in products such as folding wheelchairs, it can meet their lightweight design requirements and make the steering of the omnidirectional wheel 100 more flexible.

[0071] Optionally, in this embodiment, the thickness of the first reinforcement layer 16, the second reinforcement layer 18 and the third reinforcement layer 17 are determined according to the stress magnitude. Among them, at the stress highly concentrated area, the coating thickness of the carbon fiber material is greater than the coating thickness at the non-stress highly concentrated area. Specifically, the coating thickness of the carbon fiber material, the combination of layer angles and the design of the reinforcing ribs, etc., all need to be determined based on the force simulation analysis of the hub 10. It can be understood that the opening of the support hole 121, the bottom of the adapter groove 13 and the opening of the center shaft hole 15 are all susceptible to greater stress, so the coating thickness of the carbon fiber material in the aforementioned area is greater than that in the remaining areas. Optionally, in this embodiment, the thickness of the reinforcement layer in the stress highly concentrated area is 5 to 10 mm, and the thickness of the reinforcement layer in the non-stress highly concentrated area is 2 to 5 mm.

[0072] Optionally, in this embodiment, the carbon fiber material is a carbon fiber prepreg containing 35-45% epoxy resin.

[0073] See also Figure 4 The present application also provides a method for manufacturing an omnidirectional wheel, for preparing Figure 5 and Figure 6 The omnidirectional wheel 100 shown is characterized in that it includes the following steps:

[0074] T1: Prepare the driven wheel 20 and the support shaft 30. The driven wheel 20 has a through hole. The support shaft 30 passes through the through hole and is connected to the driven wheel 20.

[0075] T2: preparing the wheel hub 10, the wheel hub 10 being prepared by the aforementioned wheel hub manufacturing method;

[0076] T3: Install the driven wheel 20, and form a transfer groove 13 between any two adjacent supporting teeth 12. Each transfer groove 13 is installed with a driven wheel 20 and a supporting shaft 30. Both ends of the supporting shaft 30 are rotatably connected to the two supporting holes 121;

[0077] T4: Curing, preparing a second forming mold with a second forming cavity, placing the wheel hub 10, each driven wheel 20 and each support shaft 30 in the second forming mold, and heating the second forming mold to a second predetermined temperature and keeping it warm for a second predetermined time.

[0078] In the manufacturing method of the omnidirectional wheel, the specific steps of preparing the hub 10 refer to the above-mentioned embodiment. Since the manufacturing method of the omnidirectional wheel adopts all the technical solutions of all the above-mentioned embodiments, it also has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0079] It can be understood that the second forming mold has a second forming cavity adapted to the omnidirectional wheel 100 .

[0080] It is understandable that thermosetting materials usually need to go through two foaming processes for processing and forming. In the two foaming processes, the first foaming process is called front foaming or pre-foaming, at which time the foam or beads have not yet fully expanded and the density is also relatively high, so the beads obtained are expandable beads; the second foaming process is called post-foaming or secondary foaming, which produces a fully expanded, low-density final foam product. In addition, the second foaming is performed after the omnidirectional wheel 100 structure is assembled, so that the foaming material can fill the installation gap between the hub 10 and the reinforcement layer after the second expansion, thereby making the structure more compact. In this embodiment, a low-density foamed rubber material with secondary foaming ability is used to make the wheel body 11 to assist in the curing and shaping of the hub 10, which can further reduce the weight of the hub 10 while ensuring the compactness of the structure.

[0081] It can be understood that the embodiment of the present application can realize the assembly of the omnidirectional wheel 100 without using structures such as bolts and nuts, and has a simple structure, easy assembly and strong overall stability.

[0082] It is understandable that support teeth 12 are provided between the driven wheels 20 installed on a single wheel body 11, so any adjacent driven wheels 20 are discontinuous, which makes it easy to generate large vibrations during rolling. Therefore, multiple groups of wheel bodies 11 with driven wheels 20 installed can be arranged at intervals to reduce the vibration caused by the gaps between the driven wheels 20. But at the same time, the overall thickness of the omnidirectional wheel 100 will be larger, the mass will be larger, and the kinetic energy required for rolling will be greater. Therefore, in order to balance vibration and energy consumption, in this embodiment, the wheel hub 10 used in the omnidirectional wheel 100 is composed of two wheel bodies 11. In addition, in this embodiment, the two wheel bodies 11 are integrally formed and do not need to be assembled separately, which further simplifies the structure and installation process of the omnidirectional wheel 100.

[0083] Optionally, in this embodiment, the outer surface of the driven wheel 20 is wrapped with a protective layer made of a material with high temperature resistance and good wear resistance, such as resin vulcanized butyl rubber or hydrogenated nitrile rubber.

[0084] Optionally, in this embodiment, the outer surface of the driven wheel 20 is provided with an annular groove for increasing the friction coefficient.

[0085] Optionally, in this embodiment, the second predetermined temperature ranges from 135 to 145° C., and the second predetermined time ranges from 30 to 45 minutes.

[0086] See also Figure 7 and Figure 8 Optionally, in this embodiment, the step of installing the driven wheel 20 also includes installing a sleeve 31, the sleeve 31 has a closed end 312 and an open end 311, the open end 311 is outer sleeved with the support shaft 30, the closed end 312 is inserted into the support hole 121, and the sleeves 31 are installed at both ends of the support shaft 30.

[0087] It can be understood that, in this embodiment, the outer wall of the sleeve 31 is fixedly connected to the inner wall of the support hole 121, and the inner wall of the sleeve 31 is used to be rotatably connected to the support shaft 30 to achieve relative rotation between the driven wheel 20 and the contact surface.

[0088] It is understandable that the open end 311 of the sleeve 31 is exposed at the corresponding support hole 121 . To make the omnidirectional wheel 100 integral, the first reinforcement layer 16 at the opening of the support hole 121 is flush with the end surface of the open end 311 of the sleeve 31 .

[0089] It is understandable that the closed end 312 can effectively limit the axial sliding of the support shaft 30, so there is no need to set up a limiting structure to limit the support shaft 30, which can simplify the structure of the hub 10 and ensure the stability of the movement of the driven wheel 20.

[0090] Optionally, in this embodiment, the shaft sleeve 31 is made of special high-temperature engineering plastics such as polyetheretherketone (PEEK) with good wear resistance, high mechanical strength and low friction coefficient.

[0091] Optionally, in this embodiment, a limiting structure is provided in the second forming cavity to prevent the omnidirectional wheel 100 from shifting during the curing process. Optionally, in this embodiment, the limiting structure is a semicircular groove to achieve precise positioning of the driven wheel 20. In addition, since the semicircular groove needs to position the support shaft 30 of the driven wheel 20, the wall at this position is thin and needs to be specially hardened.

[0092] Optionally, in this embodiment, an assembly gap of 2 to 3 microns on one side is reserved between the shaft sleeve 31 and the support shaft 30 .

[0093] Optionally, in this embodiment, a lubricating layer is coated inside each bushing 31 , and the lubricating layer is located in the assembly gap.

[0094] It can be understood that the provision of the lubricating layer can further reduce the friction coefficient, reduce the friction between the sleeve 31 and the support shaft 30, and thus reduce the wear of the hub 10 caused by the omnidirectional wheel 100 during use.

[0095] Optionally, in this embodiment, the lubricating layer is formed by adding 3-5% of fluorinated carbon nanotubes into the sleeve 31, or a lubricant with similar lubricating function is added into the sleeve 31 to form the lubricating layer. It is understandable that the fluorinated carbon nanotube is a one-dimensional quantum material with a radial dimension of nanometer order and an axial dimension of micrometer order. The sleeve 31 is specially modified by introducing fluorinated carbon nanotubes, so that the sleeve 31 can rotate smoothly with the support shaft without liquid lubrication, and the friction coefficient between the sleeve 31 and the support shaft 30 can be effectively reduced from the original 0.3-0.4 to about 0.2, thereby greatly reducing the friction resistance encountered by the driven wheel 20 when rotating, and ultimately reducing the energy consumption when the driven wheel 20 turns. In addition, the wear caused by relative friction between the sleeve 31 and the support shaft 30 can be effectively reduced by 30%.

[0096] Optionally, in this embodiment, the curing step further includes sealing the gap between the shaft sleeve 31 and the support shaft 30 .

[0097] It is understandable that the sealing step is performed before curing. It is understandable that the temperature rise curing process used for terminal plasticization will involve a high temperature of 135 to 145°C, and the epoxy resin in the carbon fiber prepreg is prone to flow at high temperatures. Therefore, before performing terminal plasticization, the gap between the sleeve 31 and the support shaft 30 is sealed, which can effectively prevent the epoxy resin in the carbon fiber prepreg from penetrating into the gap between the sleeve 31 and the support shaft 30.

[0098] Optionally, in this embodiment, grease is added between the shaft sleeve 31 and the support shaft 30 to seal the gap between the shaft sleeve 31 and the support shaft 30 .

[0099] Optionally, in this embodiment, the grease is a fluorine grease with high viscosity.

[0100] Optionally, in this embodiment, the first forming mold is an aluminum mold, and the second forming mold is a steel mold.

[0101] It is understandable that steel molds have stronger high temperature resistance and are more suitable as molds for terminal plasticity.

[0102] Optionally, in this embodiment, post-processing steps such as roughening, grinding, and painting are also included.

[0103] The above are only optional embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A method for manufacturing a wheel hub, for preparing a wheel hub, wherein: The wheel hub comprises supporting teeth and two wheel bodies stacked and connected to each other, a plurality of the supporting teeth are arranged at intervals on the circumferential side surface of each wheel body, and a transfer groove for mounting a driven wheel is formed between two adjacent supporting teeth on each wheel body, characterized in that the manufacturing method of the wheel hub comprises the following steps: preparing a first forming material and a second forming material; Prepare the two wheel bodies, prepare a first forming mold, the first forming mold has a first forming cavity for forming the two wheel bodies, place the first forming material in the first forming cavity, heat the first forming mold to a first predetermined temperature and keep the temperature for a first predetermined time; the first forming cavity includes two first annular cavities that are interconnected and coaxially stacked and two second annular cavities that are interconnected and arranged between the two first annular cavities; the two wheel bodies are integrally formed; preparing the supporting tooth, using the second forming material to prepare the supporting tooth; Assembling, a plurality of the supporting teeth are installed at intervals on the peripheral side surface of each wheel body; Strengthening: a first reinforcement layer is coated on the surface of each supporting tooth, and a second reinforcement layer is coated on the surface of each wheel body, and the first reinforcement layer and the second reinforcement layer are integrally formed.

2. The method for manufacturing a wheel hub according to claim 1, characterized in that: The first predetermined temperature ranges from 100 to 120° C., and the first predetermined time ranges from 10 to 20 minutes.

3. The method for manufacturing a wheel hub according to claim 1, characterized in that: The step of preparing the two wheel bodies also includes forming a central axis hole at the center position of the wheel body, the two central axis holes are connected, and the hole wall of each central axis hole is covered with the second reinforcement layer.

4. The method for manufacturing a wheel hub according to any one of claims 1 to 3, characterized in that: The first forming material is a foaming material, and the second forming material is a carbon fiber material. A plurality of carbon fiber layers, all made of the carbon fiber material, are stacked to form the supporting teeth.

5. The method for manufacturing a wheel hub according to claim 4, characterized in that: The step of preparing the supporting tooth also includes forming supporting holes on both sides of the supporting tooth; the strengthening step also includes coating the inner wall of the supporting hole with a third reinforcing layer, and the first reinforcing layer, the second reinforcing layer and the third reinforcing layer are integrally formed.

6. A method for manufacturing an omnidirectional wheel, for preparing an omnidirectional wheel, characterized in that: The following steps are involved: Prepare a driven wheel and a support shaft, wherein the driven wheel has a through hole, and the support shaft passes through the through hole and is connected to the driven wheel; preparing a wheel hub, wherein the wheel hub is prepared by the method for manufacturing a wheel hub as claimed in claim 5; Install the driven wheel, and form a transfer groove for installing the driven wheel between two adjacent supporting teeth on each wheel body, and the driven wheel and the supporting shaft are installed in each transfer groove, and the two ends of the supporting shaft are rotatably connected to the two supporting holes respectively; Curing, preparing a second forming mold with a second forming cavity, placing the wheel hub, each of the driven wheels and each of the support shafts in the second forming cavity, and heating the second forming mold to a second predetermined temperature and keeping it warm for a second predetermined time.

7. The method for manufacturing the omnidirectional wheel according to claim 6, characterized in that: The second predetermined temperature ranges from 135° C. to 145° C., and the second predetermined time ranges from 30 minutes to 45 minutes.

8. The method for manufacturing an omnidirectional wheel according to claim 6, characterized in that: The step of installing the driven wheel also includes installing a shaft sleeve, wherein the shaft sleeve has a closed end and an open end, the open end is sleeved on the support shaft, and the closed end is inserted into the support hole, and the shaft sleeves are installed at both ends of the support shaft.

9. The method for manufacturing an omnidirectional wheel according to claim 8, characterized in that: A lubricating layer is coated inside each of the shaft sleeves.

10. The method for manufacturing an omnidirectional wheel according to claim 8, characterized in that: The curing step further includes sealing the gap between the bushing and the support shaft.

Images