Tire and cleaning equipment

Abstract

The invention discloses a tire and cleaning equipment, the cleaning equipment comprises the tire, the tire comprises a main body, the peripheral surface of the main body is provided with at least two circles of bulges, and the at least two circles of bulges are arranged at intervals along the axial direction of the main body; each circle of protrusions comprises a plurality of protrusions, the protrusions in the same circle of protrusions are arranged at intervals in the circumferential direction of the body, the heights of the portions, protruding out of the outer circumferential face of the body, of every two adjacent circles of protrusions are the same, a first groove is formed between every two adjacent protrusions, a plurality of cavities are further formed in the body, and the cavities are located on the sides, close to the center of the body, of the protrusions. Wherein the multiple cavities and the multiple protrusions are arranged in a one-to-one correspondence mode, and the centers of the corresponding cavities and the centers of the corresponding protrusions are sequentially arranged in the same radial direction of the main body. According to the tire and the cleaning equipment, the problem that in the prior art, a tire is prone to slipping on the wet ground is solved.

Description

Technical Field

[0001] This application relates to the field of floor cleaning, and more specifically, to a tire and cleaning equipment. Background Technology

[0002] Most cleaning equipment on the market is equipped with tires that have treads or grooves on the surface to improve the tire's obstacle-crossing ability, thereby increasing the friction between the tire and the obstacle and thus improving the tire's obstacle-crossing ability.

[0003] However, simply adding treads or grooves to the tire does not increase the tire's coefficient of friction, thus preventing the tire from slipping on wet surfaces. Summary of the Invention

[0004] The main objective of this application is to provide a tire and a cleaning device to at least solve the problem of tires easily slipping on wet surfaces in the prior art.

[0005] According to one aspect of this application, a tire is provided, comprising:

[0006] The main body has at least two rings of protrusions on its outer peripheral surface, and the at least two rings of protrusions are arranged at intervals along the axial direction of the main body.

[0007] Each ring of protrusions includes multiple protrusions. Multiple protrusions in the same ring are spaced apart along the circumferential direction of the main body. The height of the protrusions in two adjacent rings protruding from the outer circumferential surface of the main body is the same, and there is a first groove between two adjacent protrusions. The main body also has multiple cavities, which are located on the side of the protrusions near the center of the main body.

[0008] The plurality of cavities are provided in a one-to-one correspondence with the plurality of protrusions, and the centers of the corresponding cavities and the centers of the protrusions are arranged sequentially along the same radial direction of the main body.

[0009] Furthermore, in two adjacent rings of protrusions, they are arranged along the axial direction of the main body, and the line connecting the centers of two adjacent protrusions is parallel to the axis of the main body;

[0010] In two adjacent rings of protrusions, the lines connecting the centers of two adjacent first grooves are parallel to the axis of the body.

[0011] Furthermore, a reinforcing rib is provided between two adjacent cavities, and the reinforcing rib is provided in a one-to-one correspondence with the first groove, and the center of the reinforcing rib and the center of the corresponding first groove are arranged in the same radial direction of the main body.

[0012] Furthermore, the width d1 of the first groove satisfies the relationship: 0.5mm ≤ d1 ≤ 2mm; and / or,

[0013] The groove depth L1 of the first groove satisfies the following relationship: L1≥0.5mm.

[0014] Furthermore, the depth L2 of the cavity satisfies the following relationship: 0.8 mm ≤ L2 ≤ 2 mm; and / or,

[0015] The arc length L3 of the cavity along the circumference of the main body satisfies the following relationship: 4.5mm≤L3≤7mm.

[0016] Furthermore, the radius R of the tire satisfies the following relationship: 35mm≤R≤40mm.

[0017] Furthermore, each ring of protrusions includes n1 protrusions, where n1 satisfies the relationship: 24≤n1≤30, n1∈N + .

[0018] Furthermore, an annular groove is provided on the outer peripheral surface of the main body and is located between two adjacent rings of protrusions. The annular groove extends along the outer peripheral surface of the main body, and the first groove communicates with the annular groove.

[0019] Furthermore, the width d2 of the annular groove satisfies the relationship: 1mm ≤ d2 ≤ 2mm; and / or,

[0020] The depth L4 of the annular groove satisfies the following relationship: L4≥0.5mm.

[0021] Furthermore, the main body includes an inner ring, an outer ring, and a connecting layer. The inner ring, the connecting layer, and the outer ring are nested in sequence and stacked along the radial direction of the main body. The protrusion is disposed on the outer peripheral surface of the outer ring, and the cavity is formed on the connecting layer.

[0022] On the other hand, this application also provides a tire, comprising:

[0023] The main body has at least two rings of protrusions on its outer peripheral surface, and the at least two rings of protrusions are arranged at intervals along the axial direction of the main body.

[0024] Each ring of protrusions includes multiple protrusions. The multiple protrusions in the same ring are spaced apart along the circumferential direction of the main body, and there is a first groove between two adjacent protrusions. The width x1 of the protrusions on different rings along the circumferential direction of the main body is the same, and the length x2 of the protrusions on different rings along the axial direction of the main body is the same or different.

[0025] On the other hand, this application provides a cleaning device, which includes the aforementioned tire.

[0026] Compared to existing technologies, this application features multiple first grooves and cavities on the main body, with the cavities located on the side of the protrusions closer to the center of the main body. Under the influence of these cavities, the tire is more likely to indent towards the center of the main body after contacting the ground, thereby increasing the contact area between the tire and the ground and thus increasing the tire's coefficient of sliding friction. Furthermore, adjacent protrusions extend to the same height from the outer circumference of the main body, and the multiple cavities are arranged in a one-to-one correspondence with the multiple protrusions. The centers of the corresponding cavities and protrusions are sequentially arranged along the same radial direction of the main body. This means that when the tire rolls, each protrusion will indent under the influence of the cavities after contacting the ground, resulting in an almost uniform contact area between the tire and the ground. Therefore, when the tire is running on a wet surface, due to its higher coefficient of sliding friction, the sliding friction force generated after contact with the ground is greater, making it less likely for the tire to slip on wet surfaces. Similarly, when the tire is crossing obstacles, the greater sliding friction force makes it easier for the tire to climb over obstacles. In addition, the first groove can also drain water, thus preventing the formation of an interface film on the tire surface when the tire passes over a wet and slippery surface, which would reduce the tire's coefficient of sliding friction. Attached Figure Description

[0027] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0028] Figure 1 This is a schematic diagram of the tire structure disclosed in this application;

[0029] Figure 2 This is a cross-sectional view of the tire disclosed in this application from a first-view perspective.

[0030] Figure 3 This is a cross-sectional view of the tire disclosed in this application from a second perspective;

[0031] Figure 4 This is a schematic diagram showing the deformation angle of the contact surface after the tire contacts the ground.

[0032] Figure 5 This is a graph showing the relationship between the ratio of the contact area A1 between the tire of this application and the ground to the contact area A0 between the tire of existing cleaning equipment and the ratio of the sliding friction coefficient c1 of the tire of this application to the sliding friction coefficient c2 of existing tires.

[0033] The above figures include the following reference numerals:

[0034] 10. Main body; 11. Inner ring; 12. Connecting layer; 13. Outer ring; 121. Cavity; 122. Reinforcing rib; 131. Protrusion; 132. First groove; 133. Annular groove. Detailed Implementation

[0035] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0036] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0037] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0038] See Figures 1 to 5 As shown, according to an embodiment of this application, a cleaning device is provided, which may be, for example, a robotic vacuum cleaner or similar cleaning device. Specifically, the cleaning device includes a tire, and the tire includes a body 10.

[0039] The outer peripheral surface of the main body 10 is provided with at least two rings of protrusions 131, which are arranged at intervals along the axial direction of the main body 10. Each ring of protrusions 131 includes multiple protrusions 131. The multiple protrusions 131 in the same ring are arranged at intervals along the circumferential direction of the main body 10. The height of two adjacent rings of protrusions 131 protruding from the outer peripheral surface of the main body 10 is the same, and there is a first groove 132 between two adjacent protrusions 131. The main body 10 is also provided with multiple cavities 121, which are located on the side of the protrusions 131 near the center of the main body 10. The multiple cavities 121 are arranged in a one-to-one correspondence with the multiple protrusions 131, and the center of the corresponding cavity 121 and the center of the protrusion 131 are arranged sequentially along the same radial direction of the main body 10.

[0040] Specifically, in this embodiment, multiple first grooves 132 and multiple cavities 121 are formed on the main body 10, and the cavities 121 are located on the side of the protrusions 131 closer to the center of the main body. Under the action of the cavities 121, the tire is more likely to sink inward towards the center of the main body 10 after contacting the ground, thereby increasing the contact area between the tire and the ground and thus increasing the coefficient of sliding friction of the tire. On the other hand, the height of two adjacent protrusions 131 protruding from the outer circumference of the main body 10 is the same, and the multiple cavities 121 are arranged one-to-one with the multiple protrusions 131. The centers of the corresponding cavities 121 and the centers of the protrusions 131 are arranged sequentially along the same radial direction of the main body 10. This means that when the tire rolls, each protrusion 131 will sink inward under the action of the cavities 121 after contacting the ground, so that the contact area between the tire and the ground is almost the same everywhere. Therefore, when the tire runs on a wet and slippery surface, the tire has a high coefficient of sliding friction, and the sliding friction force generated after the tire contacts the ground is large, making it less likely for the tire to slip on a wet and slippery surface. Similarly, when the tire is crossing an obstacle, the greater sliding friction of the tire makes it easier for the tire to climb over the obstacle. In addition, the first groove 132 also plays a role in drainage, thereby preventing the formation of an interface film on the tire surface when the tire is on a wet and slippery surface, which would reduce the tire's coefficient of sliding friction.

[0041] Furthermore, in two adjacent rings of protrusions 131, the center of the two adjacent protrusions 131 is arranged along the axial direction of the main body 10 and the line connecting the centers of the two adjacent protrusions 131 is parallel to the axis of the main body 10; in two adjacent rings of protrusions 131, the center of the two adjacent first grooves 132 is arranged along the axial direction of the main body 10 and the line connecting the centers of the two adjacent first grooves 132 is parallel to the axis of the main body 10.

[0042] Specifically, among two adjacent rings of protrusions 131, the lines connecting the centers of two adjacent protrusions 131 are parallel to the axis of the main body 10. Among two adjacent rings of protrusions 131, the lines connecting the centers of two adjacent first grooves 132 are parallel to the axis of the main body 10. This ensures that the tire deformation is the same after each ring of protrusions 131 or first groove 132 contacts the ground. This means that when the tire is rolling, the contact area with the ground can always be maintained within a fixed range, thereby avoiding the tire from slipping on wet and slippery surfaces due to a low coefficient of friction at a certain point.

[0043] Furthermore, a reinforcing rib 122 is provided between two adjacent cavities 121. The reinforcing rib 122 is provided in a one-to-one correspondence with the first groove 132, and the center of the reinforcing rib 122 and the center of the corresponding first groove 132 are provided in the same radial direction of the main body.

[0044] Specifically, the fact that the center of the reinforcing rib 122 and the center of the corresponding first groove 132 are arranged along the same radial direction of the main body can prevent the deformation of the protrusion 131 after contact with the ground from being too small when the center of the reinforcing rib 122 and the center of the protrusion 131 are coaxially arranged. This would reduce the contact area between the tire and the ground, resulting in excessively low sliding friction between the tire and the ground. In addition, in this embodiment, the number of reinforcing ribs 122 and the number of first grooves 132 are the same. The reinforcing ribs 122 can improve the structural strength of the tire. Furthermore, the fact that multiple reinforcing ribs 122 and multiple first grooves 132 are arranged one-to-one ensures that the deformation of each protrusion 131 after contact with the ground is almost the same, thereby maintaining the sliding friction generated by the tire in contact with the ground within a certain range.

[0045] Furthermore, the width d1 of the first groove 132 satisfies the relationship: 0.5mm≤d1≤2mm.

[0046] Specifically, the width d1 of the first groove 132 should not be less than 0.5 mm. When d1 is too small, the drainage effect of the first groove 132 on the tire is reduced, leading to the formation of an interface film on the tire surface, which in turn reduces the tire's coefficient of sliding friction and may ultimately cause the tire to slip when passing over a wet surface. Furthermore, the width d1 of the first groove 132 should not be set too large, i.e., d1 > 2 mm. Since the width d1 of the first groove 132 is related to the coefficient of sliding friction of the tire-ground contact surface, when d1 is too large, the coefficient of sliding friction between the tire and the ground decreases. This is because when d1 increases, the contact area between the tire and the ground decreases, and the contact surface between the tire and the ground has a larger groove, ultimately reducing the coefficient of sliding friction on the tire. The value of d1 can be 0.5 mm, 0.7 mm, 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, and 2 mm.

[0047] Optionally, the groove depth L1 of the first groove 132 satisfies the relationship: L1≥0.5mm.

[0048] In this embodiment, the depth L1 of the first groove 132 also affects the value of the sliding friction coefficient of the tire on a wet surface. Specifically, when L1 is less than 0.5mm, the depth of the first groove 132 is shallow. When the tire deforms under the action of external forces on the ground, the bottom of the groove 132 may come into contact with the ground, making the first groove 132 unable to drain water. This may lead to the formation of an interface film on the outer surface of the tire, ultimately reducing the sliding friction coefficient of the tire. Preferably, L1 satisfies the relationship: L1 ≥ 1.5mm. When L1 satisfies the above relationship, the first groove 132 can improve the drainage efficiency of the tire, and after the tire comes into contact with the ground, the first groove 132 will not directly contact the ground. At the same time, when the tire wears to a certain extent, the first groove 132 will not disappear, thus preventing the tire from losing its drainage capacity.

[0049] Furthermore, the depth L2 of the cavity 121 satisfies the relationship: 0.8mm ≤ L2 ≤ 2mm. When L2 satisfies this relationship, the protrusions 131 on the tire have good deformation capacity after contacting the ground. The tire, after being deformed by external force, can increase the contact area with the ground, ultimately increasing the sliding friction coefficient of the tire. However, when L2 is less than 0.8mm, after the tire contacts the ground, some of the protrusions 131 on the tire will be recessed, while other protrusions 131 may not be recessed or will be recessed to a lesser degree, resulting in an insignificant increase in the contact area between the tire and the ground, which may lead to a lower increase in the sliding friction coefficient between the tire and the ground. The value of L2 should be within a certain range. When L2 is too large, i.e., L2 is greater than 2mm, the structural strength of the main body 10 is too low, ultimately leading to the main body 10 being easily damaged. The value of L2 can be 0.8mm, 1mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, and 2mm.

[0050] Optionally, the arc length L3 of the cavity 121 along the circumference of the main body 10 satisfies the relationship: 4.5mm≤L3≤7mm.

[0051] Specifically, the arc length L3 of the cavity 121 along the circumference of the main body 10 also affects the degree of indentation of the protrusion 131 on the main body 10. The larger L3 is, the larger the volume of the cavity 121. Therefore, the protrusion 131 on the main body 10 is more likely to deform after contacting the ground, thereby increasing the contact area between the ground and the outer surface of the tire. When L3 satisfies the relationship 4.5mm≤L3≤7mm, the length of L3 is moderate, and the protrusion 131 on the tire surface has good deformation ability after contacting the ground, thus increasing the contact area between the tire and the ground. When L3 is less than 4.5mm, the volume of the cavity 121 is small, which may make it difficult for the protrusion 131 to indent after contacting the ground. When L3 is greater than 7mm, on the one hand, the overall volume of the cavity 121 is large, resulting in low structural strength of the main body 10 and reducing the service life of the tire; on the other hand, the contact area between the tire and the ground is too large, increasing the rolling friction coefficient between the tire and the ground, thus affecting the tire's running speed.

[0052] In addition, the tire radius R satisfies the following relationship: 35mm≤R≤40mm.

[0053] Specifically, since the tire in this embodiment is used in cleaning equipment, which can be a cleaning station or a robotic vacuum cleaner, if the tire radius R is too large (i.e., R is greater than 40mm), the overall size of the cleaning equipment will be too large, affecting its cleaning area. In other words, an oversized tire will prevent the cleaning equipment from cleaning certain specific areas, such as under sofas or seats. Conversely, if R is less than 35mm, the tire will be too small, making it difficult for the tire to overcome obstacles. The value of R can be 35mm, 36mm, 37mm, 38mm, 39mm, or 40mm.

[0054] Furthermore, each ring of protrusions 131 includes n1 protrusions 131, where n1 satisfies the relationship: 24≤n1≤30, n1∈N + .

[0055] Specifically, the number n1 of protrusions 131 affects the number of first grooves 132 and the contact area between the tire and the ground. When n1 is large, i.e., greater than 30, the volume occupied by the protrusions 131 is large, which may reduce the width of the first grooves 132, ultimately leading to a reduction in the contact area between the tire and the ground, and a decrease in the coefficient of sliding friction between the tire and the ground. When n1 is less than 24, due to the decrease in the number of protrusions 131, although the coefficient of sliding friction of the tire increases, the coefficient of rolling friction of the tire also increases accordingly, thus affecting the rolling speed of the tire. The value of n1 can be 24, 25, 26, 27, 28, 29, or 30.

[0056] Furthermore, an annular groove 133 is provided on the outer peripheral surface of the main body 10 and is located between two adjacent rings of protrusions 131. The annular groove 133 extends along the outer peripheral surface of the main body 10, and the first groove 132 communicates with the annular groove 133. In this embodiment, the annular groove 133 is used to connect two adjacent rings of protrusions 131, so that water stains on the two adjacent rings of protrusions 131 can flow through the annular groove 133, thereby improving the tire's drainage efficiency.

[0057] Furthermore, the width d2 of the annular groove 133 satisfies the relationship: 1mm≤d2≤2mm.

[0058] Specifically, the value of d2 should not be too small. If d2 is less than 1 mm, some water will accumulate in the annular groove 133 and cannot be discharged quickly, which may lead to the formation of an interface film on the tire surface, thereby reducing the sliding friction coefficient when the tire contacts the ground. Conversely, the value of d2 should not be too large. If d2 is too large, on the one hand, it will reduce the width of the first groove 132 and the protrusion 131, thus affecting the sliding friction coefficient of the tire-ground contact surface; on the other hand, if d2 is too large, it will cause a decrease in the structural strength of the tire. The value of d2 can be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, and 1 mm. Furthermore, it should be noted that the width d2 of the annular groove 133 on the same tire should be greater than the width d1 of the first groove 132 to ensure drainage efficiency on the tire.

[0059] Optionally, the depth L4 of the annular groove 133 satisfies the relationship: L4≥0.5mm.

[0060] To prevent the depth L4 of the annular groove 133 from being too low, which would prevent two adjacent parallel first grooves 132 from connecting, the depth L4 of the annular groove 133 should be greater than or equal to 0.5 mm. When L4 ≥ 0.5 mm, the drainage efficiency of the annular groove 133 is high, and the annular groove 133 will not directly adhere to the ground when the tire is in contact with the ground. Preferably, the depth L4 of the annular groove 133 is ≥ 1.5 mm. When L4 satisfies the above relationship, the annular groove 133 will not be worn away after the tire wears to a certain extent, thereby avoiding the problem of reduced tire drainage capacity when the depth L4 of the annular groove 133 is too small.

[0061] Further, see Appendix Figure 1 and attached Figure 4 As shown, the main body 10 includes an inner ring 11, an outer ring 13, and a connecting layer 12. The inner ring 11, the connecting layer 12, and the outer ring 13 are nested in sequence and stacked along the radial direction of the main body 10. The protrusion 131 is disposed on the outer peripheral surface of the outer ring 13, and the cavity 121 is formed on the connecting layer 12.

[0062] Specifically, the inner ring 11 is fitted onto the rotating shaft of the cleaning equipment, which drives the tire to rotate. When the outer ring 13 contacts the ground, it deforms under the weight of the cleaning equipment and the supporting force applied by the ground. At the same time, because the connecting layer 12 has a cavity 121, the deformation of the outer ring 13 in contact with the ground increases, thereby improving the surface roughness of the outer ring 13 in contact with the ground to a certain extent, giving the cleaning equipment better anti-slip and obstacle-crossing capabilities.

[0063] On the other hand, this application also provides another type of tire, which includes a body, and the outer peripheral surface of the body 10 is provided with at least two rings of protrusions 131, the at least two rings of protrusions 131 being arranged at intervals along the axial direction of the body 10; each ring of protrusions 131 includes a plurality of protrusions 131, the plurality of protrusions 131 in the same ring of protrusions 131 being arranged at intervals along the circumferential direction of the body 10, and a first groove 132 being provided between two adjacent protrusions 131, wherein the width x1 of the protrusions 131 on different rings along the circumferential direction of the body 10 is the same, and the length x2 of the protrusions 131 on different rings along the axial direction of the body 10 is the same or different.

[0064] Specifically, "the width x1 of the protrusions 131 on different rings is the same along the circumferential direction of the main body 10" means that the width x1 of each protrusion 131 on different rings along the circumferential direction of the main body 10 is the same. "The length x2 of the protrusions 131 on different rings along the axial direction of the main body 10 is the same or different" means that the length x2 of all protrusions 131 on the same rings along the axial direction of the main body 10 is the same, but the length x2 of all protrusions 131 in different rings along the axial direction of the main body 10 is the same or different from that of all protrusions 131 in other rings along the axial direction of the main body 10.

[0065] When the width x1 of the protrusions 131 on different rings along the circumference of the main body 10 is the same, and the length x2 of the protrusions 131 on different rings along the axis of the main body 10 is the same, the deformation of the tire in contact with the ground is almost the same, thus ensuring that the coefficient of friction is relatively uniform throughout the tire. However, when the width x1 of the protrusions 131 on different rings along the circumference of the main body 10 is the same, and the length x2 of the protrusions 131 on different rings along the axis of the main body 10 is different, for example, the length x2 of the protrusions 131 on the outer ring along the axis of the main body 10 is greater than the length x2 of the protrusions 131 on the inner ring along the axis of the main body 10, the coefficient of friction of the protrusions 131 on the outer ring is greater than that of the protrusions 131 on the inner ring, thereby improving the tire's grip during cornering.

[0066] On the other hand, the sliding friction coefficient of the tire in this structure should satisfy the following relationship relative to the sliding friction coefficient of existing tires used in cleaning equipment:

[0067] c1 / c0=p·[θ1·(R+δR)-d1] / [θ0·R-d0], and c1 / c0>1;

[0068] Where c1 represents the sliding friction coefficient of the tire in this embodiment; c0 represents the sliding friction coefficient of a tire used in existing cleaning equipment; p is a dependent variable factor, which is related to the roughness of the tire, temperature and humidity, tire material, contact surface material, and the roughness between the two contact surfaces, and p satisfies the relationship: 0 < p < 1; as shown in the appendix. Figure 4 As shown, attached Figure 4 θ x It can be represented as θ1 or θ0, where θ1 represents the angle between the two ends of the contact surface length L5 between the tire and the ground in this embodiment and the center of the main body 10, θ0 represents the angle between the two ends of the contact surface length L5 between the existing tire and the ground and the center of the main body 10, δR is the difference between the deformation amount after the tire with the structure of this application contacts the ground and the maximum deformation amount after the tire contacts the ground in the prior art, d0 represents the width of the first groove 132 in the existing tire, and d1 is the width of the first groove 132 in the tire of this application.

[0069] Typically, the value of θ0 satisfies the relationship: 0.279rad ≤ θ0 ≤ 0.349rad, and the total weight G of the cleaning equipment satisfies the relationship: 3.5kg ≤ G ≤ 6.5kg. Furthermore, in this embodiment, θ1 can be calculated using the following formula: θ1 = 4π / n1 - d1 / R. The larger θ1 is, the greater the deformation of the tire-ground contact surface.

[0070] In one specific embodiment, the tire radius R is 35mm, and after testing, δR is 0.6mm, θ0 is 0.325rad, d0 is 3.5mm, θ1 is 0.384rad, d1 is 1.6mm, and n1 is 30. At this time, the value of p is greater than or equal to 0.7 and less than or equal to 0.85. It can be calculated that c1 / c0 is 1.53p. Therefore, c1 / c0 > 1. It can be seen that the friction force of this embodiment is improved compared with the tires of the prior art. In another specific embodiment, the tire radius R is 35mm, and after testing, δR is 0.6mm, θ0 is 0.325rad, d0 is 3.5mm, θ1 is 0.425rad, d1 is 1.6mm, and n1 is 30. In this case, the value of p is greater than or equal to 0.75 and less than or equal to 0.9. It can be calculated that c1 / c0 is 1.74p, which is obviously c1 / c0 > 1.

[0071] Furthermore, to verify the correctness of the above formula, i.e., c1 / c0≥1, this embodiment fitted the relationship between the existing tire-ground contact area A0, the tire-ground contact area A1 of this application, the existing tire's sliding friction coefficient c0, and the tire's sliding friction coefficient c1 of this application. The fitting results are attached. Figure 5 visible, Figure 5 The horizontal axis A1 / A0 represents the ratio between the contact surface A1 of the tire and the ground in this application and the contact surface A0 of the existing tire and the ground, where A1 / A0 corresponds to [θ1·(R+δR)-d1] / [θ0·R-d0] in the above formula. The vertical axis c1 / c0 represents the ratio between the sliding friction coefficient c1 of the tire in this application and the sliding friction coefficient c0 of the existing tire, where c1 / c0 corresponds to the p part of [θ1·(R+δR)-d1] / [θ0·R-d0] in the above formula. Figure 5Center line A is the baseline, representing the relationship between c1 and c0 when p = 1. Line B corresponds to the curves showing the change of c1 / c0 and A1 / A0 when the existing tire-ground contact area A0 is at its maximum. It can be seen that c1 / c0 is always greater than or equal to 1, and the p value is always less than 1. Furthermore, it can be seen that as the tire-ground contact area of ​​this application continuously increases, the p value increases with the increase of A1 / A0, but the rate of increase of p value decreases and eventually tends to a fixed value. Line C represents the curves showing the change of c1 / c0 and A1 / A0 when the existing tire-ground contact area A0 is at its minimum. Similarly, the p value increases with the increase of A1 / A0, but after increasing to a certain extent, it tends to stabilize, and p < 1. Meanwhile, Figure 5 In center lines B and C, the ratio of c1 / c0 is always greater than 1, which means that the structural improvements in this application can effectively increase the sliding friction coefficient of the tire. In reality, the relationship between c1 / c0 and A1 / A0 lies within the range of line B and line C, and both satisfy the condition that, with other factors remaining constant, c1 / c0 increases as the contact area ratio A1 / A0 increases, but the increase becomes increasingly gradual.

[0072] In summary, this application has at least the following beneficial technical effects: The main body 10 has multiple cavities 121 located on the side of the protrusion 131 closest to the center of the main body. This makes it easier for the tire of the cleaning equipment to deform after contacting the ground, thereby increasing the contact area between the tire and the ground, increasing the coefficient of sliding friction between the tire and the ground, and ultimately improving the tire's obstacle-crossing ability and its ability to move on wet surfaces. Furthermore, this application increases the contact area between the tire and the ground by limiting the width d1 of the first groove 132 in the tire, the number n1 of the protrusions 131 around the outer circumference of the tire, and the radius R of the tire, ultimately enhancing the tire's sliding friction.

[0073] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0074] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.

[0075] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A tire characterized by, The utility model relates to a tire body (10) is provided with at least two rings of protrusions (131) on the outer circumferential surface of the body (10), and the protrusions (131) are arranged in the axial direction of the body (10) at intervals. Each ring of protrusions (131) comprises a plurality of protrusions (131), and the protrusions (131) in the same ring are arranged at intervals in the circumferential direction of the body (10). The heights of the protrusions (131) in adjacent rings are the same, and the first grooves (132) are arranged between adjacent protrusions (131). The cavities (121) are arranged in one-to-one correspondence with the protrusions (131), and the centers of the corresponding cavities (121) and the centers of the protrusions (131) are arranged in the same radial direction of the body (10) in sequence.

2. Tyre according to Claim 1, characterized in that, In the adjacent two rings of protrusions (131), the line connecting the centers of the two adjacent protrusions (131) arranged in the axial direction of the body (10) is parallel to the axis of the body (10). In the adjacent two rings of protrusions (131), the line connecting the centers of the two adjacent first grooves (132) arranged in the axial direction of the body (10) is parallel to the axis of the body (10).

3. The tire of claim 1, wherein, A reinforcing rib (122) is arranged between the two adjacent cavities (121), and the reinforcing rib (122) is arranged in one-to-one correspondence with the first grooves (132).

4. The tire of claim 1, wherein, The width d1 of the first groove (132) satisfies the relationship: 0.5mm≤d1≤2mm; and / or, The depth L1 of the first groove (132) satisfies the relationship: L1≥0.5mm.

5. The tire of claim 1, wherein, The depth L2 of the cavity (121) satisfies the relationship: 0.8mm≤L2≤2mm; and / or, The arc length L3 of the cavity (121) in the circumferential direction of the body (10) satisfies the relationship: 4.5mm≤L3≤7mm.

6. The tire of claim 1, wherein, The radius R of the tire satisfies the relationship: 35mm≤R≤40mm.

7. The tire of claim 1, wherein, Each of the protrusions (131) comprises n1 protrusions (131), n1 satisfying the relationship: 24≤n1≤30, n1∈N + .

8. A tyre according to any one of claims 1 to 7, characterised in that, An annular groove (133) is arranged on the outer circumferential surface of the body (10) between the two adjacent rings of protrusions (131), and the annular groove (133) extends along the outer circumferential surface of the body (10), and the first groove (132) and the annular groove (133) are in communication.

9. Tyre according to Claim 8, characterized in that, The width d2 of the annular groove (133) satisfies the relationship: 1mm≤d2≤2mm; and / or, The depth L4 of the annular groove (133) satisfies the relationship: L4≥0.5mm.

10. A tyre according to any one of claims 1 to 7, characterised in that, The main body (10) comprises an inner ring (11), an outer ring (13) and a connecting layer (12), the inner ring (11), the connecting layer (12) and the outer ring (13) are nested in sequence and arranged in a radial direction of the main body (10), the protrusions (131) are arranged on an outer circumferential surface of the outer ring (13), and the cavities (121) are arranged on the connecting layer (12).

11. A tire characterized by Comprise: A main body (10), an outer circumferential surface of the main body (10) is provided with at least two rows of protrusions (131), and the at least two rows of protrusions (131) are arranged at intervals in an axial direction of the main body (10); Each row of protrusions (131) comprises a plurality of protrusions (131), the plurality of protrusions (131) in the same row of protrusions (131) are arranged at intervals in a circumferential direction of the main body (10), and there is a first groove (132) between adjacent two protrusions (131), wherein the widths x1 of the protrusions (131) on different rows in the circumferential direction of the main body (10) are the same, and the lengths x2 of the protrusions (131) on different rows in the axial direction of the main body (10) are the same or different.

12. A cleaning apparatus, characterized by The cleaning device comprises the tire according to any one of claims 1 to 11.

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