Universal wheel assembly and mobile equipment

Abstract

The present invention provides a universal wheel assembly and a mobile device. The universal wheel assembly of the present invention comprises: a universal wheel, a rotating shaft, a wheel frame, a shaft sleeve, a first nut and a damping assembly; the top end of the wheel frame is fixedly connected to the bottom end of the rotating shaft, and the bottom end of the wheel frame is connected to the universal wheel; the top end of the rotating shaft extends out of the shaft sleeve and is threadedly connected to the first nut, and bearings are respectively arranged between the two ends of the shaft sleeve and the rotating shaft. The universal wheel assembly of the present invention provides a damping force for the rotating shaft of the universal wheel by arranging a damping plate on the outer end surface of the bearing, thereby increasing the friction resistance of the rotating shaft to rotate and swing, avoiding the rotating shaft from rotating too fast or swinging, and improving the stability of the movement of the universal wheel assembly; and an elastic member is arranged on the side of the damping plate away from the outer end surface of the bearing, and the elastic member presses the damping plate against the outer end surface of the bearing, thereby increasing the damping force between the damping plate and the outer end surface of the bearing, and further improving the stability of the movement of the universal wheel assembly.

Description

Technical Field

[0001] The present invention relates to the technical field of mobile equipment, and in particular to a universal wheel assembly and a mobile equipment. Background Art

[0002] A universal wheel is a movable caster that can rotate 360° horizontally. It can be installed at the bottom of a device that needs to be moved to enable the device to move and walk, such as carts, bags, cleaning equipment, robots, movable interactive display screens, etc.

[0003] In the related art, the rotating shaft of the universal wheel is passed through a shaft sleeve of a device chassis, and bearings are installed at both ends of the shaft sleeve. The universal wheel can achieve 360° rotation around the rotating shaft.

[0004] However, due to assembly and production tolerances and wear, the universal wheel's shaft is prone to swing back and forth or rotate too quickly during movement, resulting in poor movement stability of the universal wheel. Summary of the invention

[0005] The invention provides a universal wheel assembly and a mobile device, so as to solve the technical problem that the rotating shaft of the existing universal wheel swings back and forth and rotates too fast, resulting in poor movement stability of the universal wheel.

[0006] The first aspect of the present invention provides a universal wheel assembly, comprising: a universal wheel, a rotating shaft, a wheel frame, a bushing, a first nut and a damping assembly; the top end of the wheel frame is fixedly connected to the bottom end of the rotating shaft, and the bottom end of the wheel frame is connected to the universal wheel; the top end of the rotating shaft extends out of the bushing and is threadedly connected to the first nut, and bearings are respectively arranged between the two ends of the bushing and the rotating shaft; the damping assembly comprises a damping plate and an elastic member, both of which are sleeved outside the rotating shaft, and the damping plate abuts against the outer end surface of the bearing, and the elastic member is located on the side of the damping plate away from the bearing.

[0007] Compared with the prior art, the universal wheel assembly provided by the first aspect of the present invention has the following advantages:

[0008] The universal wheel assembly of the present invention provides friction resistance for the rotation and swing of the rotating shaft by arranging a damping plate on the outer end surface of the bearing, thereby preventing the rotating shaft from rotating too fast or swinging, and improving the stability of the movement of the universal wheel assembly. In addition, the damping force of the damping plate will not affect the function of the universal wheel being able to rotate 360 ​​degrees. Under the action of the first nut, the elastic member of the damping assembly applies a pressing force toward the damping plate, increasing the abutment force between the damping plate and the outer end surface of the bearing, thereby increasing the damping force of the damping plate. As the damping plate wears, the elastic member increases the pressing force on the damping plate, thereby ensuring the stability of the damping force and preventing the damping force of the damping plate from decreasing with its wear. In addition, by adjusting the distance between the first nut and the threaded connection of the rotating shaft, the compression force of the elastic member can be adjusted, thereby adjusting the damping force of the damping plate, and the adjustment is simple and convenient. When maintaining or replacing the damping plate or the elastic member, the first nut can be unscrewed from the top of the rotating shaft, and the operation is simple, convenient and efficient. The present invention can realize the damping function of the rotating shaft only by using the damping sheet and the elastic member, without using the damping bearing, which is beneficial to reducing the product cost.

[0009] As an improvement of the universal wheel assembly of the present invention, the damping assembly is provided with one; the damping plate abuts against the outer end surface of the bearing at the top end of the sleeve, and the elastic member is located between the first nut and the damping plate.

[0010] As an improvement of the universal wheel assembly of the present invention, the wheel frame includes a top plate and two side plates spaced apart below the top plate, the two side plates are respectively connected to the universal wheel, and a mounting hole is provided on the top plate; the rotating shaft includes a first threaded portion, a matching portion, a limiting portion and a second threaded portion, the diameter of the first threaded portion is smaller than the diameter of the matching portion, and the first threaded portion is threadedly connected to the first nut; the diameter of the matching portion is smaller than the diameter of the limiting portion, and the bushing is provided on the outside of the matching portion; the limiting portion is located between the second threaded portion and the matching portion, and the bottom end face of the limiting portion abuts against the top plate; the universal wheel assembly also includes a second nut, and the second threaded portion extends out of the mounting hole and is threadedly connected to the second nut.

[0011] As an improvement of the universal wheel assembly of the present invention, the damping assembly is provided with one; the damping plate abuts against the outer end surface of the bearing at the bottom end of the sleeve, and the elastic member is located between the top end surface of the limiting portion and the damping plate.

[0012] As an improvement of the universal wheel assembly of the present invention, two damping assemblies are provided; the damping plate of one of the damping assemblies abuts against the outer end surface of the bearing at the top end of the sleeve, and the elastic member of the damping assembly is located between the first nut and the damping plate; the damping plate of the other damping assembly abuts against the outer end surface of the bearing at the bottom end of the sleeve, and the elastic member of the damping assembly is located between the top end surface of the limiting portion and the damping plate.

[0013] As an improvement of the universal wheel assembly of the present invention, the elastic member is a disc spring.

[0014] As an improvement of the universal wheel assembly of the present invention, the disc spring is provided with multiple disc springs, and the multiple disc springs are connected in series and / or in parallel.

[0015] As an improvement of the universal wheel assembly of the present invention, the damping plate is in contact with the outer end surface of the inner ring of the bearing and the outer ring of the bearing at the same time.

[0016] As an improvement of the universal wheel assembly of the present invention, the damping plate is in contact with the outer end surface of the inner ring of the bearing, the outer end surface of the outer ring of the bearing and the end surface of the sleeve at the same time.

[0017] A second aspect of the present invention provides a mobile device, comprising a base frame and the universal wheel assembly described in the first aspect, wherein a sleeve of the universal wheel assembly is connected to the base frame.

[0018] The mobile device provided in the second aspect of the present invention includes the universal wheel assembly described in the first aspect, so the mobile device provided in the second aspect of the present invention also has the same advantages as the universal wheel assembly described in the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 An exploded view of a universal wheel assembly provided in Embodiment 1 of the present invention;

[0020] Figure 2 A top view of the universal wheel assembly provided in Embodiment 1 of the present invention;

[0021] Figure 3 for Figure 2 AA section view in;

[0022] Figure 4 for Figure 3 Enlarged schematic diagram of the middle P region;

[0023] Figure 5 for Figure 2 BB section view in;

[0024] Figure 6 A cross-sectional view of a universal wheel assembly provided in Embodiment 2 of the present invention;

[0025] Figure 7 A cross-sectional view of a universal wheel assembly provided in Embodiment 3 of the present invention;

[0026] Figure 8 A schematic diagram of the arrangement of multiple disc springs provided in the first embodiment of the present invention;

[0027] Fig. 9 A schematic diagram of the arrangement of multiple disc springs provided in the second embodiment of the present invention;

[0028] Fig.10 A schematic diagram of the arrangement of multiple disc springs provided in Example 3 of the present invention.

[0029] Description of Reference Numerals

[0030] 10: universal wheel; 11: wheel body; 12: wheel barrel; 13: wheel axle; 131: head; 132: third threaded portion; 14: third nut; 15: compression gasket;

[0031] 20: rotating shaft; 21: first threaded portion; 22: matching portion; 23: limiting portion; 24: second threaded portion;

[0032] 30: wheel frame; 31: top plate; 311: mounting hole; 32: side plate; 321: connection hole;

[0033] 40: shaft sleeve; 41: first shaft shoulder; 42: second shaft shoulder; 43: connecting beam;

[0034] 51: first nut; 52: second nut;

[0035] 60: damping assembly; 61: damping sheet; 62: elastic member;

[0036] 70: bushing;

[0037] 81: first bearing; 82: second bearing;

[0038] a1, a2, a3, b1, b2, b3, c1, c2, c3, c4: disc spring. DETAILED DESCRIPTION

[0039] Due to assembly and production tolerances and wear, the universal wheel's shaft is prone to swing back and forth or rotate too quickly during movement, resulting in poor movement stability of the universal wheel.

[0040] In view of this, an embodiment of the present invention provides a universal wheel assembly, which provides a damping force for the rotating shaft of the universal wheel by arranging a damping plate on the outer end surface of the bearing, thereby increasing the friction resistance of the rotating shaft to rotate and swing, avoiding the rotating shaft to rotate too fast or swing, and improving the stability of the movement of the universal wheel assembly; and an elastic member is arranged on the side of the damping plate away from the outer end surface of the bearing, the elastic member presses the damping plate against the outer end surface of the bearing, thereby increasing the damping force between the damping plate and the outer end surface of the bearing, further improving the stability of the movement of the universal wheel assembly, and the damping force of the damping plate can be adjusted by adjusting the pressing force of the elastic member on the damping plate; the structure is simple, the cost is low, and it is easy to maintain.

[0041] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0042] Figure 1 An exploded view of a universal wheel assembly provided in Embodiment 1 of the present invention; Figure 2 A top view of the universal wheel assembly provided in Embodiment 1 of the present invention.

[0043] Combination Figure 1 and Figure 2 An embodiment of the present invention provides a universal wheel assembly, which includes: a universal wheel 10, a rotating shaft 20, a wheel frame 30, a shaft sleeve 40, a first nut 51 and a damping assembly 60.

[0044] The wheel frame 30 is used to connect the rotating shaft 20 and the universal wheel 10. The top of the wheel frame 30 is fixedly connected to the bottom of the rotating shaft 20. For example, the top of the wheel frame 30 is fixedly connected to the bottom of the rotating shaft 20 by bolts. For another example, the top of the wheel frame 30 is welded to the bottom of the rotating shaft 20. The bottom of the wheel frame 30 is connected to the universal wheel 10. For example, the bottom of the wheel frame 30 is provided with a round hole, and the universal wheel 10 is rotatably installed in the round hole. For another example, the wheel frame 30 is fixedly connected to the universal wheel 10, and the universal wheel 10 is provided with a wheel axle 13 so that the universal wheel 10 can rotate.

[0045] In some implementations, reference Figure 1 , Figure 2 as well as Figure 5 ,in Figure 5 for Figure 2BB cross-sectional view in FIG. The universal wheel 10 includes a wheel body 11, a wheel barrel 12 and a wheel axle 13, wherein the wheel barrel 12 is located in the middle of the wheel body 11 and is fixedly connected to the wheel body 11, or the wheel barrel 12 and the wheel body 11 are an integrally formed one-piece. The wheel axle 13 includes a shaft body in the middle, a head 131 arranged at one end of the shaft body and a third threaded portion 132 arranged at the other end of the shaft body, wherein the diameter of the head 131 is larger than the diameter of the shaft body.

[0046] The wheel frame 30 includes a top plate 31 and two side plates 32 spaced below the top plate 31. The top plate 31 is used to be fixedly connected to the bottom end of the rotating shaft 20, and the two side plates 32 are respectively connected to the universal wheel 10. Specifically, the two side plates 32 are respectively provided with coaxial connecting holes 321. The wheel axle 13 is passed through the connecting hole 321 of the wheel frame 30 and the wheel barrel 12, and the head 131 is located on the outside of one of the side plates 32, and the head 131 is in contact with the side plate 32; the third threaded portion 132 extends to the outside of the other side plate 32, and the third threaded portion 132 is threadedly connected to the third nut 14, so as to fix the universal wheel 10 on the wheel frame 30. At this time, the wheel body 11 and the wheel barrel 12 can rotate around the wheel axle 13 to realize the walking and moving function of the universal wheel 10.

[0047] In addition, a compression gasket 15 is provided between the head 131 and the side plate 32 to improve the stability and reliability of the connection between the wheel axle 13 and the side plate 32 of the wheel frame 30 .

[0048] It should be noted that the top plate 31 of the wheel frame 30 is a flat plate, and the side plate 32 is a bent plate. Specifically, the side plate 32 includes an inclined plate portion and a vertical plate portion. The vertical plate portion is connected to the top plate 31 through the inclined plate portion. The angle between the inclined plate portion and the top plate 31 is an obtuse angle, so that the distance between the vertical plate portions of the two side plates is greater than the length of the top plate 31, which facilitates the installation of the universal wheel 10.

[0049] In this embodiment, the top end of the rotating shaft 20 extends out from the sleeve 40 and is threadedly connected to the first nut 51. That is to say, the sleeve 40 is sleeved on the outside of the rotating shaft 20, and the top end of the rotating shaft 20 protrudes from the top end of the sleeve 40, and the part of the rotating shaft 20 protruding from the top end of the sleeve 40 is threadedly connected to the first nut 51. Bearings are respectively arranged between the two ends of the sleeve 40 and the rotating shaft 20. For the convenience of description, the bearing at the top end of the sleeve 40 is defined as the first bearing 81, and the bearing at the bottom end of the sleeve 40 is defined as the second bearing 82. The first bearing 81 and the second bearing 82 are bearings of the same model. In this embodiment, a bearing is arranged between the sleeve 40 and the rotating shaft 20, and the first nut 51 is threadedly connected to the top end of the rotating shaft 20, so that the rotating shaft 20 is rotatably mounted on the sleeve 40.

[0050] In this embodiment, the sleeve 40 is a cylindrical structure with two ends open, and a connecting beam 43 is provided on the side of the sleeve 40 for connecting with the chassis of the mobile device, so that the universal wheel assembly is installed at the bottom of the mobile device. Exemplarily, the connecting beams 43 of the two universal wheel assemblies are fixedly connected to form a mounting beam, and the mounting beam is connected to the chassis of the mobile device, so that the bottom of the mobile device has two coaxial universal wheel assemblies at the same time, and the mounting structure is simple.

[0051] Figure 3 for Figure 2 AA section view in; Figure 4 for Figure 3 A magnified schematic diagram of the P region in the middle. Figure 3 and Figure 4 The damping assembly 60 of this embodiment includes a damping plate 61 and an elastic member 62. The damping plate 61 and the elastic member 62 are both sleeved outside the rotating shaft 20. The elastic member 62 presses the damping plate 61 against the outer end surface of the bearing. That is, the damping plate 61 abuts against the outer end surface of the bearing, and the elastic member 62 is located on the side of the damping plate 61 away from the bearing. In the embodiment of the present invention, the outer end surface of the bearing refers to the end surface away from the sleeve 40, the outer end surface of the first bearing 81 refers to the top surface of the first bearing 81, and the outer end surface of the second bearing 82 refers to the bottom surface of the second bearing 82.

[0052] The damping assembly 60 can be installed on the outside of the first bearing 81, and the damping assembly 60 can also be installed on the outside of the second bearing 82; two damping assemblies 60 can also be provided, which are respectively installed on the outside of the first bearing 81 and the second bearing 82. It should be noted that the outside of the first bearing 81 refers to the top side of the first bearing 81, and the outside of the second bearing 82 refers to the bottom side of the second bearing 82.

[0053] In some embodiments, reference Figure 4 The damping assembly 60 is provided with a damping plate 61 that abuts against the outer end surface of the bearing at the top end of the sleeve 40, that is, the damping plate 61 abuts against the top surface of the first bearing 81; the elastic member 62 is located between the first nut 51 and the damping plate 61, and under the action of the first nut 51, the elastic member 62 presses the damping plate 61 against the top surface of the first bearing 81.

[0054] By such arrangement, the damping plate 61 provides a damping force, provides friction resistance for the rotation and swing of the rotating shaft 20, prevents the rotating shaft from rotating too fast or swinging, and improves the stability of the movement of the universal wheel assembly. In addition, the damping force of the damping plate 61 will not affect the function of the universal wheel 10 being able to rotate 360 ​​degrees. Under the action of the first nut 51, the elastic member 62 applies a pressing force toward the damping plate 61, increases the abutment force between the damping plate 61 and the top surface of the first bearing 81, and thus increases the damping force of the damping plate 61. As the damping plate 61 wears, the elastic member 62 increases the pressing force on the damping plate 61, thereby ensuring the stability of the damping force and preventing the damping force of the damping plate 61 from decreasing as it wears. In addition, by adjusting the distance between the first nut 51 and the rotating shaft 20, the compression force of the elastic member 62 can be adjusted, thereby adjusting the damping force of the damping plate 61, and the adjustment is simple and convenient. When maintaining or replacing the damping sheet 61 or the elastic member 62, the first nut 51 can be unscrewed from the top of the rotating shaft 20, which is simple, convenient and efficient. In this embodiment, the damping function of the rotating shaft 20 can be achieved only by the damping sheet 61 and the elastic member 62, without using a damping bearing, which is conducive to reducing product costs.

[0055] In other embodiments, reference Figure 6 ,in, Figure 6 A cross-sectional view of a universal wheel assembly provided in Embodiment 2 of the present invention. A damping assembly 60 is provided, and the damping assembly 60 is installed on the bottom side of the second bearing 82. Before describing the installation structure in detail below, the specific structure of the rotating shaft 20 is described to facilitate the installation of the damping assembly 60 on the bottom side of the second bearing 82.

[0056] Combination Figure 1 and Figure 6 The rotating shaft 20 includes a first threaded portion 21, a matching portion 22, a limiting portion 23 and a second threaded portion 24. The diameter of the first threaded portion 21 is smaller than the diameter of the matching portion 22, and the first threaded portion 21 is threadedly connected to the first nut 51; the diameter of the matching portion 22 is smaller than the diameter of the limiting portion 23, and a shaft sleeve 40 is arranged on the outer side of the matching portion 22, a first bearing 81 is arranged between the top end of the matching portion 22 and the top end of the shaft sleeve 40, and a second bearing 82 is arranged between the bottom end of the matching portion 22 and the top end of the shaft sleeve 40; the limiting portion 23 is located between the second threaded portion 24 and the matching portion 22, and the bottom end face of the limiting portion 23 abuts against the top plate 31 of the wheel frame 30, and the limiting portion 23 is used to realize the axial positioning of the second bearing 82.

[0057] Next, the mounting structure of the first bearing 81 and the second bearing 82 will be described.

[0058] The two ends of the sleeve 40 are respectively recessed outward to form a first shoulder 41 and a second shoulder 42; a bushing 70 is arranged between the first bearing 81 and the second bearing 82, and the bushing 70 is sleeved on the outside of the matching portion 22 of the rotating shaft 20. The bottom end of the outer ring of the first bearing 81 abuts against the first shoulder 41, and the bottom end of the inner ring of the first bearing 81 abuts against the top end of the bushing 70; the top end of the first bearing 81 abuts against the damping plate 61, see Figure 5 , or, the top end of the first bearing 81 abuts against the first nut 51, see Figure 6 The top end of the outer ring of the second bearing 82 abuts against the second shaft shoulder 42, and the bottom end of the inner ring of the second bearing 82 abuts against the bottom end of the bushing 70; the bottom end of the second bearing 82 abuts against the top end surface of the limiting portion 23 of the rotating shaft 20, see Figure 5 Or, the bottom end of the second bearing 82 abuts against the damping plate 61, see Figure 6 .

[0059] At this time, the second threaded portion 24 of the rotating shaft 20 passes through the mounting hole 311 provided on the top plate 31 and is threadedly connected with the second nut 52, thereby achieving a fixed connection between the rotating shaft 20 and the wheel frame 30, and facilitating installation and disassembly.

[0060] Continue to refer to Figure 6 In this embodiment, the damping plate 61 abuts against the outer end surface of the bearing at the bottom end of the sleeve 40, that is, the damping plate 61 abuts against the bottom surface of the second bearing 82; the elastic member 62 is located between the top end surface of the limiting portion 23 and the damping plate 61, and under the action of the first nut 51 and the limiting portion 23, the elastic member 62 presses the damping plate against the bottom surface of the second bearing 82.

[0061] Through such an arrangement, in addition to the advantage that the damping assembly 60 is arranged on the top side of the first bearing 81, the damping plate 61 of this embodiment is located on the outside of the second bearing 82 at the bottom end of the sleeve 40, and it can directly bear the gravity of the sleeve 40. This is beneficial to increase the damping force between the damping plate 61 and the bottom surface of the second bearing 82, thereby helping to improve the stability of the movement of the universal wheel assembly.

[0062] In some other embodiments, reference Figure 7 ,in, Figure 7A cross-sectional view of a universal wheel assembly provided in Embodiment 3 of the present invention. Two damping assemblies 60 are provided, which are respectively provided on the outside of two bearings. Specifically, the damping plate 61 of one damping assembly 60 abuts against the outer end surface of the bearing at the top end of the sleeve 40, that is, the damping plate 61 abuts against the top surface of the first bearing 81; the elastic member 62 of the damping assembly 60 is located between the first nut 51 and the damping plate 61, and under the action of the first nut 51, the elastic member 62 presses the damping plate 61 against the top surface of the first bearing 81. The damping plate 61 of the other damping assembly 60 abuts against the outer end surface of the bearing at the bottom end of the sleeve 40, that is, the damping plate 61 abuts against the bottom surface of the second bearing 82; the elastic member 62 of the damping assembly 60 is located between the top end surface of the limiting portion 23 and the damping plate 61.

[0063] The universal wheel assembly of this embodiment has the advantages of the above two embodiments, which will not be described in detail here.

[0064] In the embodiment of the present invention, the elastic member 62 of the damping assembly 60 can be a cylindrical spring, and abutment sheets can be provided at both ends of the cylindrical spring to improve the stability of the abutment; the elastic member 62 can also be a rubber tube, which provides elastic compression force and has a buffering effect. The elastic member 62 can be a disc spring, which has a simple structure and is easy to install, and the structure is stable and not easy to tilt; the installation space is small, which is conducive to making the structure of the universal wheel assembly compact.

[0065] The disc spring can be set with one piece, please refer to Figure 4 , Figure 6 as well as Figure 7 In order to facilitate the abutment, the outer edge of the disc spring abuts against the damping plate 61, and the inner edge of the disc spring abuts against the first nut 51 or the top end surface of the limiting portion 23. In order to increase the pressing force on the damping plate 61, the disc spring can also be provided with multiple pieces, for example, two pieces, three pieces, four pieces, etc. The embodiment of the present invention does not limit the specific number of disc springs.

[0066] There are many ways to arrange the multiple disc springs, and the multiple disc springs can be connected in series and / or in parallel. The following is an example of a damping assembly 60 having three disc springs. Figures 8 to 10 ,in, Figure 8 A schematic diagram of the arrangement of multiple disc springs provided in the first embodiment of the present invention; Fig. 9 A schematic diagram of the arrangement of multiple disc springs provided in the second embodiment of the present invention; Fig.10 A schematic diagram of the arrangement of multiple disc springs provided in Example 3 of the present invention.

[0067] Reference Figure 8, three disc springs are connected in series, specifically, disc spring a1 and disc spring a2 are arranged face to face, and a compression space is formed between disc spring a1 and disc spring a2; disc spring a2 and disc spring a3 are arranged back to back. At this time, the inner edge of disc spring a1 abuts against the first nut 51 or the top end surface of the limiting portion 23, and the outer edge of disc spring a3 abuts against the damping plate 61.

[0068] Reference Fig. 9 The three disc springs are connected in parallel. Specifically, the surface of disc spring b1 is in contact with the back of disc spring b2, and the surface of disc spring b2 is in contact with the back of disc spring b3. At this time, the inner edge of disc spring b1 is in contact with the first nut 51 or the top end surface of the limiting portion 23, and the outer edge of disc spring b3 is in contact with the damping plate 61.

[0069] Reference Fig.10 , the disc spring c1 and the disc spring c2 are connected in parallel, the disc spring c3 and the disc spring c4 are connected in parallel, and then in series. Specifically, the back of the disc spring c1 and the surface of the disc spring c2 are attached and connected in series, the surface of the disc spring c3 and the back of the disc spring c4 are attached and connected in series, and the disc spring c2 and the disc spring c3 are connected back to back in series. At this time, one of the outer edge of the disc spring c1 and the outer edge of the disc spring c4 abuts against the damping plate 61, and the other of the outer edge of the disc spring c1 and the outer edge of the disc spring c4 abuts against the first nut 51 or the top end face of the limiting portion 23. At this time, when the outer diameter of the first nut 51 is smaller than the outer edge diameter of the disc spring, an abutment sheet can be provided between the first nut 51 and the outer edge of the disc spring to facilitate the abutment between the first nut 51 and the outer edge of the disc spring; when the outer diameter of the limiting portion 23 is smaller than the outer edge diameter of the disc spring, an abutment sheet can be provided between the limiting portion 23 and the outer edge of the disc spring to facilitate the abutment between the limiting portion 23 and the outer edge of the disc spring.

[0070] The damping sheet 61 in the embodiment of the present invention may be a wear-resistant plastic gasket, which is beneficial to prolonging the service life.

[0071] In some implementations, the damping sheet 61 abuts against the outer end surfaces of the inner ring of the bearing and the outer ring of the bearing at the same time. Figure 4 The outer end of the damping plate 61 extends to the outer ring of the first bearing 81, increasing the friction surface area of ​​the damping plate 61, thereby increasing the friction resistance. When the shaft 20 rotates, the shaft 20 and the inner ring of the first bearing 81 rotate, the outer ring of the first bearing 81 and the sleeve 40 are fixed, and the damping plate 61 abuts against the outer end surface of the rotating inner ring and the outer end surface of the fixed outer ring at the same time, which is conducive to increasing the damping force of the shaft 20 and preventing the shaft 20 from rotating too fast or swinging.

[0072] In other implementations, the damping sheet 61 is in contact with the outer end face of the inner ring of the bearing, the outer end face of the outer ring of the bearing, and the end face of the sleeve 40. That is, the outer end of the damping sheet 61 extends to the end face of the sleeve 40, and the damping sheet 61 is in contact with the outer end faces of the inner ring and the outer ring of the bearing, and the end face of the sleeve 40, further increasing the friction surface area of ​​the damping sheet 61, which is conducive to improving the friction resistance.

[0073] In summary, the universal wheel assembly provided by the embodiment of the present invention has at least the following advantages:

[0074] 1. The damping force of the rotating shaft 20 is increased by providing the damping assembly 60 to prevent the rotating shaft 20 from swinging back and forth or rotating too fast, thereby improving the stability of the movement of the universal wheel assembly.

[0075] 2. The top end of the rotating shaft 20 is threadedly connected with a first nut 51 . By adjusting the distance between the first nut 51 and the rotating shaft 20 , the compression force of the elastic member 62 can be adjusted, thereby adjusting the damping force of the damping plate 61 .

[0076] 3. The damping assembly 60 of the embodiment of the present invention can provide a damping function through the damping sheet 61 and the elastic member 62, and has a simple structure and low cost.

[0077] 4. The damping assembly 60 can be repaired and replaced by unscrewing the first nut 51, which is simple and convenient to operate.

[0078] 5. When the damping plate 61 is worn, the compression force of the elastic member 62 can be increased by screwing in the first nut 51, thereby increasing the pressing force of the damping plate 61, maintaining the damping force of the damping plate 61, and preventing the damping force from being reduced due to the wear of the damping plate 61.

[0079] The embodiment of the present invention further provides a mobile device, which includes a base frame and the universal wheel assembly of the above embodiment, wherein the shaft sleeve 40 of the universal wheel assembly is connected to the base frame. The mobile device may be a cleaning device, a cart, a bag, a robot, a movable interactive display screen, etc., but is not limited thereto.

[0080] The mobile device provided in the second aspect of the present invention includes the universal wheel assembly of the above embodiment, so the mobile device provided in the second aspect of the present invention also has the same advantages as the universal wheel assembly of the above embodiment, which will not be repeated here.

[0081] In the above description, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0082] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A universal wheel assembly, characterized in that: include: A universal wheel, a rotating shaft, a wheel frame, a shaft sleeve, a first nut and a damping assembly; The top end of the wheel frame is fixedly connected to the bottom end of the rotating shaft, and the bottom end of the wheel frame is connected to the universal wheel; The top end of the rotating shaft extends out from the sleeve and is threadedly connected to the first nut, and bearings are respectively arranged between the two ends of the sleeve and the rotating shaft; The damping assembly includes a damping plate and an elastic member, both of which are sleeved outside the rotating shaft, and the damping plate abuts against the outer end surfaces of the inner ring of the bearing and the outer ring of the bearing at the same time, and the elastic member is located on the side of the damping plate away from the bearing.

2. The universal wheel assembly according to claim 1, characterized in that: The damping assembly is provided with one; the damping plate is in contact with the outer end surface of the bearing at the top end of the sleeve, and the elastic member is located between the first nut and the damping plate.

3. The universal wheel assembly according to claim 1, characterized in that: The wheel frame comprises a top plate and two side plates spaced below the top plate, the two side plates are respectively connected to the universal wheels, and a mounting hole is provided on the top plate; The rotating shaft comprises a first threaded portion, a matching portion, a limiting portion and a second threaded portion, wherein the diameter of the first threaded portion is smaller than the diameter of the matching portion, and the first threaded portion is threadedly connected to the first nut; the diameter of the matching portion is smaller than the diameter of the limiting portion, and the shaft sleeve is arranged outside the matching portion; the limiting portion is located between the second threaded portion and the matching portion, and the bottom end surface of the limiting portion abuts against the top plate; The universal wheel assembly also includes a second nut, and the second threaded portion extends out of the mounting hole and is threadedly connected to the second nut.

4. The universal wheel assembly according to claim 3, characterized in that: The damping assembly is provided with one; the damping plate is in contact with the outer end surface of the bearing at the bottom end of the sleeve, and the elastic member is located between the top end surface of the limiting portion and the damping plate.

5. The universal wheel assembly according to claim 3, characterized in that: The damping components are provided with two; A damping plate of one of the damping assemblies abuts against an outer end surface of a bearing at a top end of the sleeve, and an elastic member of the damping assembly is located between the first nut and the damping plate; The damping plate of another damping assembly abuts against the outer end surface of the bearing at the bottom end of the sleeve, and the elastic member of the damping assembly is located between the top end surface of the limiting portion and the damping plate.

6. The universal wheel assembly according to any one of claims 1 to 5, characterized in that: The elastic member is a disc spring.

7. The universal wheel assembly according to claim 6, characterized in that: The disc spring is provided with a plurality of disc springs, and the plurality of disc springs are connected in series and / or in parallel.

8. The universal wheel assembly according to any one of claims 1 to 5, characterized in that: The damping plate is in contact with the outer end surface of the inner ring of the bearing, the outer end surface of the outer ring of the bearing and the end surface of the sleeve at the same time.

9. A mobile device, characterized in that: It comprises a base frame and the universal wheel assembly according to any one of claims 1 to 8, wherein the shaft sleeve of the universal wheel assembly is connected to the base frame.

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