Elastic damping wheel set and carrier

Abstract

The invention provides an elastic damping wheel set and a carrier. The elastic damping wheel set comprises an elastic seat, the elastic seat comprises an outer pipe and an inner pipe, the outer pipe and the inner pipe are integrally connected through a plurality of spokes, and a hollow hole is formed between every two adjacent spokes; the wheel body is coaxially provided with a shaft assembly, the shaft assembly penetrates through the inner pipe and is assembled with the inner wall of the inner pipe, and the wheel body has the rotational degree of freedom relative to the elastic seat; and the supporting arm is connected with the outer wall of the outer pipe, and the supporting arm can be assembled to a carrier. The elastic seat does not rotate, the wheel body rotates, the elastic seat participates in elastic buffering, and the wheel body participates in rolling. Therefore, the wheel has the advantages of elastic buffering and low rolling resistance at the same time, and the elastic buffering can cope with vibration of the wheel body in all directions.

Description

Technical Field

[0001] The present application relates to the field of wheels, and in particular to an elastic shock-absorbing wheel set and a vehicle. Background Art

[0002] When a vehicle, such as a suitcase, moves on a rough or uneven road, it will generate vibration and noise. In order to avoid such vibration and noise, solid rubber tires, foam tires, pneumatic tires, etc. are often used as tires to carry the vehicle in the prior art, which achieves a certain shock absorption and noise reduction effect. However, when moving on an uneven road, there will still be strong noise.

[0003] The Chinese invention patent with publication number "CN111284272A" discloses "shock-absorbing and silent wheel and movable device". The shock-absorbing and silent wheel includes a hub, which is annular; and a rim, which is fixedly connected to the radial outer side of the hub, and the rim includes an outer layer, a strip and a transition layer, the strip is located on the radial inner side of the outer layer, the transition layer is located on the radial inner side of the strip, and the transition layer is connected to the hub. There are multiple strips evenly spaced along the circumference of the shock-absorbing and silent wheel, and the spacing between the strips makes the rim hollow. The strips are bent into a C-shaped structure as a whole, and the cross-sectional area of ​​the two end parts of the radial direction of the shock-absorbing and silent wheel of the strip is larger than the cross-sectional area of ​​the middle part of the strip. By adopting the above technical solution, the vibration and noise of the tire can be reduced, and the movable device using this shock-absorbing and silent wheel is also quieter when moving. However, there is still some room for improvement in the vibration and noise reduction of the wheel set. Summary of the invention

[0004] This application is made in view of the above-mentioned state of the prior art. In a first aspect, this application provides an elastic shock-absorbing wheel set.

[0005] An elastic shock-absorbing wheel set according to one embodiment of the present application includes: an elastic seat, wherein the elastic seat includes an outer tube and an inner tube, wherein the outer tube and the inner tube are integrally connected via a plurality of spokes, and hollow holes are formed between adjacent spokes; a wheel body, wherein the wheel body is coaxially equipped with an axle assembly, wherein the axle assembly passes through the inner tube and is assembled with the inner wall of the inner tube, and the wheel body has a rotational freedom relative to the elastic seat; and a support arm, wherein the support arm is connected to the outer wall of the outer tube, and the support arm can be assembled to a carrier.

[0006] As a further improvement of the present application, the spokes include strip spokes or derived spokes; the two ends of the strip spokes are respectively connected to the outer tube and the inner tube, and the space between adjacent strip spokes naturally forms the hollow hole; the elastic seat is punched in the area from the outer tube to the inner tube, and the punching actively forms the hollow hole, and the entity of the elastic seat around the punching naturally forms the derived spokes.

[0007] As a further improvement of the present application, the spokes are multi-curvature spokes, and when observed from an axial perspective of the elastic seat, the extension trajectory of the multi-curvature spokes is a multi-curvature curve.

[0008] As a further improvement of the present application, when viewed from an axial direction of the elastic seat, the extension trajectory of the spoke is C-shaped.

[0009] As a further improvement of the present application, in the circumferential direction of the elastic seat, the C-shaped protruding directions of all the spokes are the same or opposite.

[0010] As a further improvement of the present application, two adjacent spokes protruding in opposite directions together form an elliptical spoke, and the elastic seat includes a plurality of the elliptical spokes.

[0011] As a further improvement of the present application, two adjacent spokes protruding in opposite directions and facing away from each other together constitute an outward-expanding spoke group, and two adjacent spokes protruding in opposite directions and facing each other together constitute an inward-retracting spoke group.

[0012] As a further improvement of the present application, two adjacent multi-curvature spokes cross each other and together form an X-shaped spoke.

[0013] As a further improvement of the present application, the cross-sectional profile of the outer tube is circular, elliptical, polygonal, waist-shaped or rounded polygonal, and the waist-shaped is the profile shape of an oblong hole.

[0014] As a further improvement of the present application, the two ends of the C-shape of the spoke are respectively connected to the outer tube and the inner tube; in the same hollow hole, when the angles formed by the two ends of the C-shape of the same spoke and the outer tube and the inner tube at the junction are both acute angles or both obtuse angles, the spoke is a first bent spoke; and / or the two ends of the C-shape of the spoke are respectively connected to the outer tube and the inner tube; in the same hollow hole, when the angles formed by the two ends of the C-shape of the same spoke and the outer tube and the inner tube at the junction are an acute angle and an obtuse angle, the spoke is a second bent spoke; the curvature of the first bent spoke is greater than the curvature of the second bent spoke.

[0015] As a further improvement of the present application, the spokes include first spokes located on the horizontal left and right sides of the inner tube, and the spokes also include second spokes located on the upper and lower sides of the inner tube, the thickness of the first spoke is not equal to the thickness of the second spoke, and / or the curvature of the first spoke is not equal to the curvature of the second spoke.

[0016] As a further improvement of the present application, the thickness of the first spoke is greater than the thickness of the second spoke, and / or the curvature of the first spoke is smaller than the curvature of the second spoke.

[0017] As a further improvement of the present application, the outer tube, the inner tube, and the spokes have equal or unequal lengths in the axial direction, and the outer tube and the inner tube are arranged coaxially or non-coaxially.

[0018] As a further improvement of the present application, the support arm includes a hole in contact with the outer wall of the outer tube, the support arm includes an integral annular sleeve and an extension arm, the annular sleeve has the hole inside, and the annular sleeve is integrally injection molded or adhesively connected to the elastic seat.

[0019] As a further improvement of the present application, the outer wall of the shaft assembly and the inner wall of the inner tube are fixed and restrict each other's rotational freedom, and at least one end of the shaft assembly is equipped with the wheel body; the wheel body has rotational freedom relative to the shaft assembly, and one end or both ends of the shaft assembly are movably assembled with the wheel body through bearings, the wheel body is used for grounding and rolling, and the elastic seat is not used for grounding.

[0020] As a further improvement of the present application, the top of the extension arm is provided with an assembly hole, and the extension arm is assembled with a top shell through the assembly hole; the support arm and the top shell have a rotational freedom with the central axis of the assembly hole as the axis; the stiffness of the wheel body is greater than the stiffness of the elastic seat.

[0021] As a further improvement of the present application, when one of the elastic seats is assembled with the shaft assembly, at least one end of the shaft assembly is assembled with the wheel body.

[0022] As a further improvement of the present application, the inner diameters of the holes are equal or unequal, and the contours of the holes include circular holes or polygonal holes; and / or the contours of the holes are regular hexagons, and the derived spokes are broken line spokes.

[0023] In a second aspect, a vehicle is provided, comprising the elastic shock-absorbing wheel set.

[0024] The beneficial effects of the elastic shock-absorbing wheel set of the present application include:

[0025] Firstly, the elastic seat does not rotate but the wheel body rotates, so the elastic seat participates in elastic buffering and the wheel body participates in rolling. The wheel body itself may not have the same elastic deformation design as the elastic seat, so the rolling resistance can be lower.

[0026] Secondly, even under heavy load conditions, the elastic seat is mainly used to replace the wheel body for deformation buffering, so the wheel body is less damaged under heavy load conditions.

[0027] Thirdly, the elastic seat participates in creep when the wheel is parked for a long time, which can relatively ensure the roundness of the wheel body.

[0028] Secondly, the elastic seat itself does not participate in the rotation and does not roll against the ground, so the material selection range of the elastic seat is not limited to the material selection range of the elastic wheel in the prior art, for example, a material with low rebound characteristics can be selected.

[0029] In addition, the spokes are arranged in a circle around the shaft assembly, so the spokes act as all-round elastic limiters and can cope with vibrations in all directions to which the wheel body is subjected.

[0030] In addition, the spokes of the elastic seat are used to connect the wheel body and the carrier, thereby avoiding the vibration transmission of the rigid connection in the prior art.

[0031] In addition, the support arm can be connected to the vehicle, and the force between the wheel and the vehicle is radially transmitted step by step through the shaft assembly, inner tube, spokes, outer tube, and holes. The spokes and hollow holes can fully participate in elastic buffering by relying on their own deformation.

[0032] Finally, the focus of the wheel set of this technical solution is not on the wheel itself, but on the wheel seat and axle seat. The elastic seat is a part of the wheel seat and axle seat. The existing wheel seat and axle seat are basically rigid. The elastic seat is not simply the modeling technology of the elastic wheel transplanted to the wheel seat and axle seat, which has produced many unexpected technical effects. This is a creation of a change in the relationship between elements, mainly because the action relationship has changed, so good effects and functional changes have been achieved. The elastic shock-absorbing wheel set is simple and ingenious as a whole. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments, the drawings of the embodiments 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 creative work.

[0034] Figure 1 It is a front view of an elastic seat of an embodiment of the elastic shock-absorbing wheel set of the present application;

[0035] Figure 2 It is a top view of an elastic seat of an embodiment of the elastic shock-absorbing wheel set of the present application;

[0036] Figure 3 It is a three-dimensional diagram of an elastic seat of an embodiment of the elastic shock-absorbing wheel set of the present application;

[0037] Figure 4 It is a schematic diagram of the assembly of the elastic seat and the support arm of one embodiment of the elastic shock-absorbing wheel set of the present application;

[0038] Figure 5 is a three-dimensional diagram of a first embodiment of the elastic shock-absorbing wheel set of the present application;

[0039] Figure 6 is a perspective view of a second embodiment of the elastic shock-absorbing wheel set of the present application;

[0040] Figure 7 is a test result of a first noise test of an embodiment of the elastic shock-absorbing wheel set of the present application;

[0041] Figure 8 is a test result of a second noise test of an embodiment of the elastic shock-absorbing wheel set of the present application;

[0042] Fig. 9 is the test result of the third noise test of an embodiment of the elastic shock-absorbing wheel set of the present application;

[0043] Fig.10 It is a first state diagram of the finite element analysis of the elastic seat of one embodiment of the elastic shock-absorbing wheel set of the present application;

[0044] Fig.11 is a second state diagram of the finite element analysis of the elastic seat of one embodiment of the elastic shock-absorbing wheel set of the present application;

[0045] Fig.12 It is a front view of a second embodiment of the elastic seat of the elastic shock-absorbing wheel set of the present application;

[0046] Fig.13 It is a front view of a third embodiment of the elastic seat of the elastic shock-absorbing wheel set of the present application;

[0047] Fig.14 It is a front view of a fourth embodiment of the elastic seat of the elastic shock-absorbing wheel set of the present application;

[0048] Fig.15 It is a front view of a fifth embodiment of the elastic seat of the elastic shock-absorbing wheel set of the present application;

[0049] Fig.16 It is a front view of a sixth embodiment of the elastic seat of the elastic shock-absorbing wheel set of the present application;

[0050] Fig.17 It is a front view of a seventh embodiment of the elastic seat of the elastic shock-absorbing wheel set of the present application;

[0051] Fig.18 It is a front view of a first embodiment of the elastic shock-absorbing wheel set of the present application;

[0052] Fig.19 It is a front view of a second embodiment of the elastic shock-absorbing wheel set of the present application;

[0053] Fig. 20 It is a front view of a third embodiment of the elastic shock-absorbing wheel set of the present application;

[0054] Fig.21 It is a front view of a fourth embodiment of the elastic shock-absorbing wheel set of the present application.

[0055] Description of Reference Numerals

[0056] 1-top shell; 2-support arm; 21-annular sleeve; 211-hole; 22-extension arm; 221-assembly hole; 222-flange; 3-elastic seat; 31-outer tube; 311-rounded rectangular tube; 32-inner tube; 33-spoke; 331-first spoke; 332-second spoke; 334-elliptical spoke; 335-multi-curvature spoke; 336-X-shaped spoke; 337-broken line spoke; 338-outer expansion spoke Spoke group; 339-inward spoke group; 33a-strip spoke; 33b-derived spoke; 33c-first curved spoke; 33d-second curved spoke; 34-hollow hole; 341-first local surface; 342-second local surface; 343-concave surface; 344-convex surface; 35-center hole; 4-wheel body; 41-fixing hole; 5-axis assembly; 51-outer sleeve; 6-elliptical cavity; 7-circular hole; 8-polygonal hole. DETAILED DESCRIPTION

[0057] The exemplary embodiments of the present application are described below with reference to the accompanying drawings. It should be understood that these specific descriptions are only used to teach those skilled in the art how to implement the present application, and are not intended to exhaust all possible methods of the present application, nor to limit the scope of the present application.

[0058] See also Figures 3 to 5 The embodiment of the present application provides an elastic shock-absorbing wheel set. The elastic shock-absorbing wheel set may include an elastic seat 3 and a wheel body 4. The elastic seat 3 includes an outer tube 31 and an inner tube 32. The outer tube 31 and the inner tube 32 are integrally connected through a plurality of spokes 33, and hollow holes 34 are formed between adjacent spokes 33. Figure 5 As shown, the wheel body 4 is coaxially assembled with the shaft assembly 5, and the shaft assembly 5 passes through the inner tube 32, and the outer wall of the shaft assembly 5 is assembled with the inner wall of the inner tube 32. Figure 3 As shown, the inner tube 32 has an axially extending center hole 35, and the inner wall of the inner tube 32 is the inner wall of the center hole 35. The outer wall of the outer tube 31 can be directly or indirectly assembled with the main body of the vehicle. The elastic shock-absorbing wheel assembly can also include a support arm 2, which is responsible for connecting with the outer wall of the outer tube 31, and the support arm 2 is also responsible for assembly with the vehicle. The support arm 2 can include a hole 211 that contacts the outer wall of the outer tube 31, and the support arm 2 realizes a semi-wrapped assembly of the outer tube 31. More specifically, the support arm 2 surrounds the outer tube 31 on the entire circumference of the outer tube 31. Among them, the shape of the hole 211 is not limited, and it can be different types of holes 211 such as straight holes, blind holes, and tapered holes. The contact method between the hole 211 and the outer tube 31 is also not limited, and it can be injection molding, or it can be a method of mutual assembly of two independent parts.

[0059] The elastic seat 3 is an elastic shock-absorbing structure. The elastic seat 3 itself is made of elastic material. In addition to the elastic seat 3 participating in shock absorption with the help of its own material, the shape of the spokes 33 can also participate in shock absorption. The elastic seat 3 is installed with the shaft assembly 5, the wheel body 4 will rotate, and the elastic seat 3 itself will not rotate. The shock-absorbing and silencing principle of the elastic seat 3 is to utilize the alternately spaced spokes 33 and the hollow holes 34, mainly through the deformation of the spokes 33 to absorb energy, forming an elastic shock-absorbing effect similar to that of a spring, and the hollow holes 34 are equivalent to providing the spokes 33 with deformation space for bending, compression, and stretching.

[0060] The spokes 33 include strip spokes 33a or derived spokes 33b. From a manufacturing perspective, the two ends of the strip spokes 33a are connected to the outer tube 31 and the inner tube 32 respectively, and the space between adjacent strip spokes 33 naturally forms a hollow hole 34. From another manufacturing perspective, the elastic seat 3 is punched in the area from the outer tube 31 to the inner tube 32, and the solid material of the elastic seat 3 around the punching naturally forms the derived spokes 33b, and the punching actively forms the hollow hole 34. Figure 1 , Figures 12 to 15 The example is a strip-shaped spoke 33a, such as Fig.16 , Fig.17 An example is the derivative spoke 33b.

[0061] The inner diameters of the holes may be equal or unequal, e.g. Fig.16 As shown, the punched hole profile may be a circular hole 7. The inner diameter of the circular hole 7 may not be uniform, for example, the radial distances of the circular holes 7 with the same inner diameter to the centroid of the elastic seat 3 are equal. The circular hole 7 with a relatively large inner diameter forms a derivative spoke 33b, and the locally thicker position of the derivative spoke 33b is further punched to form a circular hole 7 with a relatively small inner diameter. Fig.17 As shown, the punched hole profile may also be a polygonal hole 8, and the punched hole profile may be a regular hexagon. Fig.17 The derived spoke 33b is a broken line spoke 337. The broken line spoke 337 may include a plurality of straight segments in sequence, and the connected straight segments form an obtuse angle of 120°.

[0062] In one embodiment, if Figure 1As shown, the spokes 33 include a plurality of first spokes 331 located on the left and right sides of the inner tube 32 (i.e., in the same horizontal direction), and the spokes 33 also include a plurality of second spokes 332 located on the upper and lower sides of the inner tube 32 (i.e., in the same vertical direction). The thickness of the first spoke 331 may not be equal to the thickness of the second spoke 332, and the curvature of the first spoke 331 may not be equal to the curvature of the second spoke 332. The essence is that the radial stiffness of the first spoke 331 and the second spoke 332 are different. For example, the thickness of the first spoke 331 is greater than the thickness of the second spoke 332, that is, the size of the first spoke 331 along the circumferential direction of the elastic seat 3 is greater than the size of the second spoke 332 along the circumferential direction of the elastic seat 3. Or the curvature of the first spoke 331 is less than the curvature of the second spoke 332. The spokes 33 are relatively slender strip structures. The strip structure of the spokes 33 is to make the stress of the elastic seat 3 more dispersed after being compressed, and is a structural optimization to reduce stress concentration. From an axial perspective, the thickness of the same spoke 33 at different local locations may be uniform.

[0063] The number of the first spokes 331 and the number of the second spokes 332 can be equal. The first spokes 331 and the second spokes 332 are different in thickness, which makes the elastic potential energy of the elastic seat 3 different in different directions. It can be set that the spokes 33 in the up and down directions have smaller elastic force and stronger energy absorption capacity, while the spokes 33 in the left and right directions have larger elastic force and weaker energy absorption capacity. Although the elastic seat 3 looks like a wheel, it is counterintuitive that the elastic seat 3 does not participate in the rotation. The elastic seat 3 can be understood as a part of the wheel seat and the axle. Therefore, the spatial position of the spokes 33 at different positions is relatively unchanged, and the working conditions of the spokes 33 at different positions are actually different, so the spokes 33 can be designed in a targeted manner. The first spokes 331 located in the same horizontal left and right directions are thicker, and they are relatively less prone to bending and deformation, which makes it less easy for the wheel body 4 to vibrate without periodicity in the left and right directions, thereby ensuring the stability of the wheel body 4 to a certain extent.

[0064] Figure 10 to Figure 11 It is a finite element analysis diagram of the elastic seat 3 under stress state. Fig.10 and Fig.11 The forces are the same. Fig.10 The force direction is horizontal. Fig.11 The force direction is vertical. The deformation degree of each part of the model is displayed. Figure 10 to Figure 11 Different colors are used to represent different degrees of deformation. Warm colors such as red or yellow represent high displacement areas, and cool colors such as blue or green represent low displacement areas. As can be seen from the figure, red represents relatively large displacement, and blue represents relatively small displacement. Because the outer tube 31 is fixed, the outer tube 31 is expressed in blue, and the inner tube 32 moves a relatively large distance, so it is basically red. The spokes 33 are also stressed, and the spokes 33 close to the inner tube 32 are yellow, and the spokes 33 close to the outer tube 31 are green. Compared with green, the displacement of yellow is relatively high.

[0065] Figure 10 to Figure 11 middle, Fig.10 It represents that the elastic seat 3 is mainly subjected to horizontal lateral loads. It can be seen that the deformation of the second spoke 332 at the upper and lower positions is smaller, but the deformation of the first spoke 331 at the left and right positions is larger, and the first spoke 331 on one side is bent, and the first spoke 331 on the other side is stretched. Fig.11 It means that the elastic seat 3 is mainly subjected to vertical load. It can be seen that the deformation of the first spoke 331 in the left-right position is small, but the deformation of the second spoke 332 in the upper-lower position is large. The second spoke 332 at one end is bent, and the second spoke 332 at the other end is stretched. Generally, if the elastic seat 3 is under a downward pressure load, the second spoke 332 in the upper part of the elastic seat 3 is in a bent and compressed state, and the second spoke 332 in the lower part of the elastic seat 3 is in a pulled state.

[0066] In a non-limiting example, the outer tube 31, the inner tube 32, and the spokes 33 are each of equal length in the axial direction, and the outer tube 31 and the inner tube 32 are coaxially arranged, that is, the axial ends of the elastic seat 3 are flush, which makes the overall outer contour of the elastic seat 3 a shape similar to a cylinder. In actual application, the overall outer contour of the elastic seat 3 is determined according to actual needs and is not necessarily a cylinder.

[0067] Along different radial positions, the elastic seat 3 can be roughly divided into an outer tube 31, a hollow structure elastic body, and an inner tube 32. The outer tube 31 is responsible for connecting the vehicle body or other components of the wheel set, the hollow structure elastic body refers to the spokes 33 arranged at intervals, and the inner tube 32 is responsible for connecting the shaft assembly 5. After the inner tube 32 and the shaft assembly 5 are fixed, they restrict each other's rotational freedom.

[0068] In the radial direction, the radial thickness of the outer tube 31 and the inner tube 32 can be uniform, that is, the outer tube 31 and the inner tube 32 are both circular tube structures of equal thickness. The radial thickness of the outer tube 31 and the inner tube 32 can also be uneven, that is, the outer tube 31 and the inner tube 32 have at least one side similar to a truncated cone. Because the elastic seat 3 does not actually participate in the rotation, the outer ring of the elastic seat 3, that is, the cross-sectional profile of the outer wall of the outer tube 31, may not necessarily be circular from the axial perspective of the elastic seat 3, and may be elliptical, rectangular or other shapes. The cross-sectional profile of the inner wall of the outer tube 31 is not necessarily circular. The axes of the outer tube 31 and the inner tube 32 may overlap, or they may not overlap, that is, the geometric center of the inner tube 32 may be eccentric relative to the outer tube 31.

[0069] In one embodiment, when viewed from the axial direction of the elastic seat 3 , the extension trajectory of each spoke 33 is C-shaped.

[0070] In one embodiment, in the circumferential direction of the elastic seat 3, the C-shaped protrusion directions of all spokes 33 are the same or opposite. Fig.12 As shown, two adjacent spokes 33 protruding in opposite directions together form an elliptical spoke 334, and the elastic seat 3 includes a plurality of elliptical spokes 334. The hollow hole 34 surrounded by the elliptical spokes 334 is the elliptical cavity 6. It can also be understood that the protruding directions of the spokes 33 in this state are alternated one by one.

[0071] In one embodiment, if Fig.15 As shown, two adjacent spokes 33 protruding in opposite directions and facing each other together constitute an outward-expanding spoke group 338, and two adjacent spokes 33 protruding in opposite directions and facing each other together constitute an inward-retracting spoke group 339. It can also be understood that the protruding directions of the spokes 33 in this state are not alternated one by one.

[0072] In one embodiment, if Fig.14 As shown, the spoke 33 is a multi-curvature spoke 335. When viewed from the axial direction of the elastic seat 3, the extension track of the multi-curvature spoke 335 is a multi-curvature curve. Two adjacent multi-curvature spokes 335 intersect with each other and together form an X-shaped spoke 336. Fig.14 The X-shaped spoke 336 is a curved spoke 33. For example, two multi-curvature spokes 335 can also be symmetrically crossed. From the axial perspective of the elastic seat 3, the extension track of the spoke 33 is X-shaped.

[0073] In one embodiment, the cross-sectional profile of the outer tube 31 is circular, elliptical, polygonal, rounded polygonal or waist-shaped. The waist-shaped is the profile of a waist-shaped hole (i.e., an oblong hole). In order to meet the needs of practical applications, the cross-sectional profile of the outer tube 31 can also be other various special shapes, such as a variant of the waist-shaped, that is, the two parallel line segments originally possessed by the waist-shaped are no longer parallel, but become angled to each other, and the radii of the two semicircular arcs originally possessed by the waist-shaped are no longer equal, but become one larger and one smaller. Fig.12 , Fig.15 As shown, the cross-sectional profile of the outer tube 31 is a rounded rectangle in a rounded polygon, that is, the outer tube 31 is a rounded rectangular tube 311. Because the elastic seat 3 itself does not participate in the rotation, the cross-sectional profile of the outer wall of the outer tube 31 does not necessarily have to be circular, and the shape of the elastic seat 3 is less restricted, which is also the advantage of the elastic seat 3 in the present application.

[0074] In one embodiment, the two ends of the C-shaped spoke 33 are connected to the outer tube 31 and the inner tube 32 respectively. Figure 3As shown in FIG. 1 , in the same hollow hole 34, when the angles formed between the two ends of the C-shaped spoke 33 and the outer tube 31 and the inner tube 32 at the junction are both acute angles or both obtuse angles, the spoke 33 is set as a first curved spoke 33c. The two ends of the C-shaped spoke 33 are connected to the outer tube 31 and the inner tube 32 respectively. Fig.13 As shown, in the same hollow hole 34, when the angles between the two ends of the C-shaped spoke 33 and the junctions of the outer tube 31 and the inner tube 32 are an acute angle and an obtuse angle, the spoke 33 is a second curved spoke 33d. Figure 3 and Fig.13 It can also be seen that the curvature of the first curved spoke 33c is greater than the curvature of the second curved spoke 33d. The first curved spoke 33c and the second curved spoke 33d have different application ranges. For example, if two elastic seats 3 each using the first curved spoke 33c and the second curved spoke 33d are made of the same material, the first curved spoke 33c is more suitable for scenes with relatively large loads, while the second curved spoke 33d is more suitable for scenes with relatively small loads.

[0075] like Fig.13 The special shape of the second curved spoke 33d allows the material of the second curved spoke 33d to be selected to have a greater hardness than the material of the first curved spoke 33c, thereby expanding the material selection range of the elastic seat 3. For example, the elastic seat 3 with the second curved spoke 33d can also be a plastic part, not necessarily a rubber part.

[0076] In one embodiment, the thickness of each part of the same spoke 33 is equal or unequal, the thickness of different spokes 33 is equal or unequal, and the curvatures of different spokes 33 are equal or unequal.

[0077] The spokes 33 include first spokes 331 located at the horizontal left and right sides of the inner tube 32, and the spokes 33 also include second spokes 332 located at the upper and lower sides of the inner tube 32. The thickness of the first spokes 331 is not equal to the thickness of the second spokes 332. Figure 1 As shown, the thickness of the first spoke 331 may be greater than the thickness of the second spoke 332 .

[0078] In one embodiment, the outer tube 31, the inner tube 32, and the spokes 33 have equal or unequal lengths in the axial direction, and the outer tube 31 and the inner tube 32 are arranged coaxially or non-coaxially. If a certain component participates in rotation, its shape design needs to be arranged coaxially. Just because the elastic seat 3 does not participate in rotation, the outer tube 31 and the inner tube 32 in the elastic seat 3 do not necessarily need to be arranged coaxially, which further increases the flexibility of the shape design of the elastic seat 3.

[0079] In one embodiment, if the axial lengths of the outer tube 31 and the inner tube 32 are not equal, for example, the axial length of the outer tube 31 may be greater than the axial length of the inner tube 32, and the axial lengths of the spokes 33 gradually shorten as they go radially inward. Alternatively, the axial length of the outer tube 31 may be less than the axial length of the inner tube 32, so that the wheel body 4 and the elastic seat 3 can maintain a certain distance, and even if the wheel body 4 is skewed to a certain extent during the force-bearing process, the wheel body 4 and the elastic seat 3 are not likely to interfere with each other.

[0080] The ends of the spokes 33 are not vertically connected to the outer tube 31 or the inner tube 32, which ensures that the spokes 33 are tilted in a specified direction after being compressed, or the spokes 33 are straightened along a specified direction after being pulled.

[0081] The curvature radius of the outer wall of the outer tube 31, the curvature radius of the inner wall of the outer tube 31, the curvature radius of the outer wall of the inner tube 32, and the curvature radius of the inner wall of the inner tube 32 are gradually reduced. The curvature radius of the C-shape of the spoke 33 can be smaller than the curvature radius of the inner wall of the inner tube 32. In this way, the curvature degree of the spoke 33 is ensured, thereby ensuring that the spoke 33 has a large deformation range whether it is stretched or compressed.

[0082] The specific shape of the spokes 33 is generally as follows Figure 1 The C-shape shown in the figure allows the spokes 33 to be pre-set to a certain degree of bending, so that the deformation and bending thereof will be performed in a specified direction. In addition, the shape of the spokes 33 can also be an ellipse, a semi-ellipse, a honeycomb, an X-shape, or the like, mainly to allow the spokes 33 and the hollow holes 34 to form an alternatingly spaced or solid or hollow structure.

[0083] In one embodiment, along the circumferential bidirectional direction of the elastic seat 3, the two sides of the hollow hole 34 are respectively a concave curved surface 343 and a convex curved surface 344, and the concave curved surface 343 is located at the same circumferential unidirectional position of the hollow hole 34. Figure 1 As shown, the inner wall of each hollow hole 34 is sequentially composed of a first partial surface 341, a concave curved surface 343, a second partial surface 342, and a convex curved surface 344. The first partial surface 341 is a part of the inner wall of the outer tube 31, and the second partial surface 342 is a part of the outer wall of the inner tube 32.

[0084] In one embodiment, if Figure 4 As shown, the fixing method of the elastic seat 3 and the inner and outer structures can be bonding, or a one-time molding process such as double-color injection molding, or other mechanical structure fixing. The support arm 2 includes an integral annular sleeve 21 and an extension arm 22. The annular sleeve 21 has a hole 211 inside, and the annular sleeve 21 and the elastic seat 3 can be integrally injection molded. The function of the annular sleeve 21 is to maintain the shape stability of the outer tube 31.

[0085] The manufacturing sequence between the elastic seat 3 and the support arm 2 can be to first inject the support arm 2, and then inject the elastic seat 3. The support arm 2 has a pore for the elastic seat 3 in a molten state to enter, so that the local material of the elastic seat 3 can enter the pore to obtain mechanical structural restrictions. Even if there is no pore, the elastic seat 3 and the annular sleeve 21 of the support arm 2 are bonded and fixed firmly. In this way, the elastic seat 3 and the support arm 2 are integrally manufactured by an injection mold. The support arm 2 can be a plastic part with relatively high rigidity, and the elastic seat 3 can be a plastic part with relatively low rigidity. The two can be hot-melt bonded to have stronger firmness.

[0086] In one embodiment, the outer wall of the shaft assembly 5 is fixed to the inner wall of the inner tube 32, the axial length of the shaft assembly 5 is greater than the axial length of the inner tube 32, and at least one end of the shaft assembly 5 is equipped with a wheel body 4. The outer diameter of the wheel body 4 is greater than the outer diameter of the outer tube 31, and the outer diameter of the wheel body 4 is also greater than the outer diameter of the annular sleeve 21. A bearing is provided between the end of the shaft assembly 5 and the wheel body 4, and the wheel body 4 has a degree of freedom of rotation relative to the shaft assembly 5. The wheel body 4 is used for grounding and rolling, while the elastic seat 3 is not used for grounding.

[0087] In one embodiment, the shaft assembly 5 can be an integrated optical shaft, or a split assembly including an inner shaft core and an outer shaft sleeve 51. The inner shaft core is responsible for assembly with the wheel body 4, and the inner shaft core and the outer shaft sleeve 51 are assembled with each other through fasteners. The outer shaft sleeve 51 and the inner tube 32 are preferably bonded to each other or integrally injection molded. The fastener assembly form of the inner shaft core and the outer shaft sleeve 51 includes but is not limited to thread assembly, rivet assembly, and spring assembly.

[0088] The shaft assembly 5, the elastic seat 3, and the support arm 2 can be fixed as one, thus ensuring the firmness of the three, and the rotational freedom of the wheel body 4 is achieved by components such as bearings and sleeves. The rigidity of the wheel body 4 can be greater than that of the elastic seat 3.

[0089] The specific implementation state of the wheel body 4 can be that an elastic seat 3 is arranged between the two wheel bodies 4 to form a Figure 6 The double wheel caster shown in FIG. 1 can also be a wheel body 4 disposed between two elastic seats 3 to form a single wheel caster disposed in a forward direction. It can also be a wheel body 4 with an elastic seat 3 disposed on one side to form a single wheel caster disposed in a forward direction. Figure 5 Single wheel castor with offset setting as shown. Figure 6 As shown, the centroid of the wheel body 4 may be provided with a fixing hole 41 , which may be a through hole such as a stepped hole, and a bolt is passed through the fixing hole 41 to securely assemble the wheel body 4 and the shaft assembly 5 .

[0090] In one embodiment, the top of the extension arm 22 has an assembly hole 221 , and the extension arm 22 is assembled with the top shell 1 through the assembly hole 221 . The support arm 2 and the top shell 1 have rotational freedom about the central axis of the assembly hole 221 .

[0091] like Figure 4 , Figure 5 As shown, taking the universal wheel as an example, the outer wall of the extension arm 22 may also have a flange 222 protruding radially outward, and the top surface of the flange 222 supports the top shell 1.

[0092] In one embodiment, taking a common wheel as an example, that is, a wheel having only one rotational degree of freedom, when an elastic seat 3 is assembled with an axle assembly 5, at least one end of the axle assembly 5 is assembled with a wheel body 4. Fig.18 In the illustration, only one wheel body 4 is shown. Fig.19 As shown, two wheel bodies 4 are shown. When two elastic seats 3 are assembled with the same shaft assembly 5, it can be as follows Fig. 20 As shown, a wheel body 4 is installed in the middle of the shaft assembly 5, and the wheel body 4 is located between the two elastic seats 3. Fig.21 As shown, a wheel body 4 is mounted on each end of the shaft assembly 5, and two elastic seats 3 are located between the two wheel bodies 4. Fig.21 The shaft length of the shaft assembly 5 is greater than Fig.19 The axial length of the middle shaft assembly 5. Figures 18 to 21 It expresses several typical forms of applying the elastic seat 3. The actual application may not be limited to Figures 18 to 21 On the other hand, the present application also provides a vehicle, which adopts the elastic shock-absorbing wheel set. The vehicle can be a suitcase, and the bottom of the suitcase is equipped with a plurality of elastic shock-absorbing wheel sets of the present application. The top shell 1 is fixed to a corner of the suitcase.

[0093] Compared with the wheels known to the inventor that simply rely on their own hollow structure and material elasticity, the wheels with their own hollow structure and their own elastic material are called hollow structure shock-absorbing wheels. The performance advantages of the elastic shock-absorbing wheel set of the present application include:

[0094] First, the rotation of the hollow shock-absorbing wheel will be accompanied by the compression and rebound of the elastic body of the wheel, which consumes a certain amount of energy, and the rolling resistance will be larger than that of the traditional hard-structure wheel. However, the hollow structure (i.e., the hollow hole 34) of the present application is located on the wheel axle (i.e., the elastic seat 3), and the elastic seat 3 does not rotate. The compression and rebound of the elastic seat 3 are basically only used for energy absorption, and there is little invalid compression and rebound, so the final rolling resistance is similar to that of the traditional hard-structure wheel, and the rolling resistance can be controlled within a smaller range.

[0095] Secondly, when the load and deformation of the hollow shock-absorbing wheel are large, its own deformation will be large, and the part in contact with the ground will be flattened and compressed, and the rolling resistance will increase sharply, affecting the normal use of the vehicle. However, when the elastic shock-absorbing wheel set of the present application is faced with a load exceeding the design, even if part of the hollow hole 34 is squeezed to almost nothing, that is, the inner tube 32 moves downward relatively, so that the outer tube 31 and the inner tube 32 fit together, it is almost degenerated into a solid elastic body, that is, the elasticity of the outer tube 31 and the inner tube 32 is used to provide elastic buffering. However, there is no limit on the material of the wheel body 4 itself, and the wheel body 4 can still use a wheel body 4 with greater rigidity, so the rolling resistance does not change significantly.

[0096] Thirdly, when facing a long-term, heavy-loaded static situation, the hollow structure shock-absorbing wheel itself is prone to creep until it cannot be fully restored, which is similar to the failure of a car tire after being parked for many years. At this time, if you continue to use this kind of deformation-failed hollow structure shock-absorbing wheel, because the hollow structure shock-absorbing wheel is no longer a standard circle, the hollow structure shock-absorbing wheel will produce additional periodic vibrations during the rolling process, which will seriously affect the normal use of the vehicle. The elastic shock-absorbing wheel set of the present application will not produce such periodic vibrations, because even in the case of a long time and heavy load, it is only the elastic seat 3 that creeps instead of the wheel body 4, and in the end, at most the resilience and shock-absorbing and quiet performance of the elastic seat 3 will be reduced, but the roundness of the wheel body 4 remains normal, the wheel body 4 can roll normally, and the vehicle can also be used normally.

[0097] Finally, in order to avoid the situation where the rolling resistance of the hollow shock-absorbing wheel is too large, it has high requirements for the elastomeric material and must have high resilience. The elastic shock-absorbing wheel set of the present application does not have many restrictions on the material requirements of the elastic seat 3. The elastic seat 3 can be made of either high resilience material or low resilience material. Generally, low resilience material has better energy absorption effect and better energy absorption effect.

[0098] Compared with the common spring shock-absorbing structure known to the inventor, the performance advantages of the elastic shock-absorbing wheel set of the present application include:

[0099] Ordinary spring shock absorption refers to a shock absorption structure in the form of a metal compression spring, metal tension spring, etc. connected between the wheel and the axle. Usually, the spring shock absorption structure is relatively simple, and is generally divided into two types: one is a pendulum rod, through which the vehicle and the wheel are connected. The pendulum rod has the ability to swing within a certain angle range, and the spring is connected to the pendulum rod at an angle, exerting elastic force on the swing of the pendulum rod, thereby providing an elastic shock absorption effect. The second is that the wheel and the vehicle are connected by a straight rod, and the wheel can move back and forth along the straight rod. For example, the spring is placed outside the straight rod or arranged parallel to the straight rod, thereby providing an elastic shock absorption effect.

[0100] First, since the common spring shock-absorbing structure limits the wheel to swinging motion or linear motion, that is, the energy absorption of the common spring shock-absorbing structure has a specific direction, the energy absorption effect in other directions is very poor. However, the spokes 33 of the elastic shock-absorbing wheel assembly of the present application are equivalent to surrounding the shaft assembly 5 at 360 degrees, which can cope with vibrations in all directions and even lateral vibrations.

[0101] Secondly, the swing rod and the straight rod mentioned in the above-mentioned common spring shock-absorbing structure generally rigidly connect the wheel and the vehicle, so that part of the vibration of the wheel during rolling will be transmitted to the vehicle through the swing rod and the straight rod. In the elastic shock-absorbing wheel set of the present application, the wheel body 4 and the vehicle can be connected only by the elastic seat 3, so the isolation performance between the wheel body 4 and the vehicle is good.

[0102] Finally, the springs in common spring shock absorbers are generally metal springs. However, the elastic seat 3 in the elastic shock absorbing wheel set of the present application is made of elastomeric materials such as plastic, and the damping loss of plastic materials to vibration is greater than that of metal materials, so it has a better shock absorbing effect.

[0103] See also Figures 7 to 9 For example, taking a suitcase as an example, it is assumed that wheel set A is an ordinary spring shock-absorbing wheel set in the prior art, and it is assumed that wheel set B is an elastic shock-absorbing wheel set of the present application. Figures 7 to 9 This is a comparison chart of the noise decibels (dB) of wheel group A and wheel group B when traveling on different roads. The solid line represents wheel group A, and the dotted line represents wheel group B. Figures 7 to 9 The horizontal axis is the noise frequency (Hz) and the vertical axis is the decibel (dB) value. Figures 7 to 9 We performed a spectral analysis on the recorded audio, mainly selecting the range of 100Hz to 5000Hz, because the human ear has different sensitivities to vibration noise, and this perception depends not only on the size of the noise decibel (dB), but also on the noise frequency (Hz).

[0104] Figure 7 It is on the striped pothole cement road, Figure 8 On the tiled pavement, Fig. 9 It is on the asphalt road surface. Among them, striped pits are roads with parallel stripes at equal intervals, which are mostly laid on the platforms of major stations.

[0105] As can be seen from the figure, under the three types of road simulation tests, the noise of wheel group B is generally lower than that of wheel group A. In particular, in the control test on the striped pit cement road surface, the noise of wheel group B is significantly lower than that of wheel group A, and the noise reduction can reach nearly 10dB. On the tile road surface, the noise of wheel group B is close to that of wheel group A, but the noise of wheel group B can also be several decibels lower than that of wheel group A. At different frequencies, the noise of wheel group B is also generally lower than that of wheel group A, especially between 200Hz and 1000Hz, the noise reduction is obvious.

[0106] The above embodiments are only for illustrating the technical concept and features of the present application, and their purpose is to enable people familiar with this technology to understand the content of the present application and implement it. They cannot be used to limit the scope of protection of the present application. All equivalent changes or modifications made according to the spirit of the present application should be included in the scope of protection of the present application.

Claims

1. An elastic shock-absorbing wheel set, characterized in that: include: An elastic seat (3), the elastic seat (3) comprising an outer tube (31) and an inner tube (32), the outer tube (31) and the inner tube (32) being integrally connected via a plurality of spokes (33), and hollow holes (34) being formed between adjacent spokes (33); A wheel body (4), wherein the wheel body (4) is coaxially mounted with an axis assembly (5), wherein the axis assembly (5) passes through the inner tube (32) and is mounted on the inner wall of the inner tube (32), and the wheel body (4) has a degree of rotational freedom relative to the elastic seat (3); A support arm (2), the support arm (2) is connected to the outer wall of the outer tube (31), and the support arm (2) can be assembled on a carrier.

2. The elastic shock-absorbing wheel assembly according to claim 1, characterized in that: The spokes (33) include strip spokes (33a) or derivative spokes (33b); The two ends of the strip-shaped spokes (33a) are respectively connected to the outer tube (31) and the inner tube (32), and the space between adjacent strip-shaped spokes (33) naturally forms the hollow hole (34); The elastic seat (3) is perforated in the region from the outer tube (31) to the inner tube (32), the perforations actively forming the hollow holes (34), and the entity of the elastic seat (3) around the perforations naturally forming the derived spokes (33b).

3. The elastic shock-absorbing wheel assembly according to claim 1, characterized in that: The spokes (33) are multi-curvature spokes (335), and when observed from an axial perspective of the elastic seat (3), the extension trajectory of the multi-curvature spokes (335) is a multi-curvature curve.

4. The elastic shock-absorbing wheel assembly according to claim 1, characterized in that: Observed from an axial perspective of the elastic seat (3), the extension track of the spokes (33) is C-shaped.

5. The elastic shock-absorbing wheel assembly according to claim 4, characterized in that: In the circumferential direction of the elastic seat (3), the C-shaped protruding directions of all the spokes (33) are the same or opposite.

6. The elastic shock-absorbing wheel assembly according to claim 1, characterized in that: Two adjacent spokes (33) protruding in opposite directions together form an elliptical spoke (334), and the elastic seat (3) comprises a plurality of the elliptical spokes (334).

7. The elastic shock-absorbing wheel assembly according to claim 1, characterized in that: Two adjacent spokes (33) protruding in opposite directions and facing away from each other together form an outward-expanding spoke group (338), and two adjacent spokes (33) protruding in opposite directions and facing each other together form an inward-retracting spoke group (339).

8. The elastic shock-absorbing wheel assembly according to claim 3, characterized in that: Two adjacent multi-curvature spokes (335) cross each other and together form an X-shaped spoke (336).

9. The elastic shock-absorbing wheel assembly according to claim 1, characterized in that: The cross-sectional profile of the outer tube (31) is circular, elliptical, polygonal, waist-shaped or rounded polygonal, and the waist-shaped is the profile shape of an oblong hole.

10. The elastic shock-absorbing wheel assembly according to claim 4, characterized in that: The two ends of the C-shaped spoke (33) are respectively connected to the outer tube (31) and the inner tube (32); In the same hollow hole (34), when the angles formed by the two ends of the C-shape of the same spoke (33) and the junctions of the outer tube (31) and the inner tube (32) are both acute angles or both obtuse angles, the spoke (33) is a first curved spoke (33c); and / or The two ends of the C-shaped spoke (33) are respectively connected to the outer tube (31) and the inner tube (32); In the same hollow hole (34), when the angles formed by the two ends of the C-shape of the same spoke (33) and the junctions of the outer tube (31) and the inner tube (32) are an acute angle and an obtuse angle, the spoke (33) is a second bent spoke (33d); The curvature of the first curved spoke (33c) is greater than the curvature of the second curved spoke (33d).

11. The elastic shock-absorbing wheel assembly according to claim 1, characterized in that: The spokes (33) include first spokes (331) located on the horizontal left and right sides of the inner tube (32), and the spokes (33) also include second spokes (332) located on the upper and lower sides of the inner tube (32), and the thickness of the first spokes (331) is not equal to the thickness of the second spokes (332), and / or the curvature of the first spokes (331) is not equal to the curvature of the second spokes (332).

12. The elastic shock-absorbing wheel assembly according to claim 11, characterized in that: The thickness of the first spoke (331) is greater than the thickness of the second spoke (332), and / or the curvature of the first spoke (331) is smaller than the curvature of the second spoke (332).

13. The elastic shock-absorbing wheel assembly according to claim 1, characterized in that: The outer tube (31), the inner tube (32), and the spokes (33) have equal or unequal lengths in the axial direction, and the outer tube (31) and the inner tube (32) are coaxially arranged or non-coaxially arranged.

14. The elastic shock-absorbing wheel assembly according to claim 1, characterized in that: The support arm (2) comprises a hole (211) in contact with the outer wall of the outer tube (31), the support arm (2) comprises an integral annular sleeve (21) and an extension arm (22), the annular sleeve (21) has the hole (211) inside, and the annular sleeve (21) is integrally injection-molded or adhesively connected to the elastic seat (3).

15. The elastic shock-absorbing wheel assembly according to claim 1, characterized in that: The outer wall of the shaft assembly (5) is fixed to the inner wall of the inner tube (32) and mutually restricts the degree of rotational freedom; at least one end of the shaft assembly (5) is equipped with the wheel body (4); The wheel body (4) has a degree of freedom of rotation relative to the shaft assembly (5); one end or both ends of the shaft assembly (5) and the wheel body (4) are movably assembled via bearings; the wheel body (4) is used for grounding and rolling, and the elastic seat (3) is not used for grounding.

16. The elastic shock-absorbing wheel assembly according to claim 14, characterized in that: The top of the extension arm (22) is provided with an assembly hole (221), the extension arm (22) is assembled with a top shell (1) through the assembly hole (221), and the support arm (2) and the top shell (1) have a rotational freedom with the central axis of the assembly hole (221) as the axis; The rigidity of the wheel body (4) is greater than the rigidity of the elastic seat (3).

17. The elastic shock-absorbing wheel assembly according to claim 1, characterized in that: When one of the elastic seats (3) is assembled with the shaft assembly (5), at least one end of the shaft assembly (5) is assembled with the wheel body (4).

18. The elastic shock-absorbing wheel assembly according to claim 2, characterized in that: The inner diameters of the punched holes are equal or unequal, and the outlines of the punched holes include circular holes (7) or polygonal holes (8); and / or the outlines of the punched holes are regular hexagons, and the derived spokes (33b) are broken line spokes (337).

19. A carrier, characterized in that: The invention comprises the elastic shock absorbing wheel set according to any one of claims 1 to 18.

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