Protective structure for bearing on wheel axle and motorcycle

Abstract

The present invention discloses a protective structure for a bearing on a wheel axle and a motorcycle, comprising a gearbox and a wheel, wherein the gearbox is provided with a first protective ring extending toward one side of the wheel, and the wheel is provided with a second protective ring extending toward one side of the gearbox, and the second protective ring and the first protective ring are both arranged around the outer periphery of the bearing, and a first protective gap is formed between the second protective ring and the first protective ring; the second protective ring is provided with a first annular groove, and the first annular groove is arranged on the side of the second protective ring facing the first protective ring, and the first annular groove is arranged around the outer periphery of the second protective ring. The first protective ring and the second protective ring both play a role in blocking dirt such as mud and sand, and the first protective gap increases the difficulty of mud and sand entering inwardly; the first annular groove makes it difficult for mud and sand entering the first protective gap to enter inwardly, thereby further preventing mud and sand from entering the bearing, solving the noise problem caused by the wear of the bearing due to the entry of mud and sand, and extending the service life of the bearing.

Description

Technical Field

[0001] The invention relates to the technical field of motorcycles, in particular to a protective structure for a bearing on a wheel axle and a motorcycle. Background Art

[0002] The working environment of the rear axle bearing of a vehicle body (such as a motorcycle) is very harsh. On the one hand, the rear axle bearing needs to bear the weight from the rear of the vehicle body, and on the other hand, the rear axle bearing also needs to bear the impact force generated by the rear tire. Therefore, it is necessary to protect the rear axle bearing.

[0003] Since the rear wheel axle is arranged near the rear wheel, the mud and sand stirred up by the rear wheel when working can easily enter the inside of the bearing, causing bearing wear and noise problems, and even affecting the service life of the bearing. Summary of the invention

[0004] Based on this, it is necessary to provide a protective structure for the bearing on the wheel axle and a motorcycle; the protective structure for the bearing on the wheel axle can prevent dirt such as mud and sand generated during driving from reaching the bearing, thereby protecting the bearing from wear caused by mud and sand, etc., solving the noise problem caused by bearing wear, and extending the service life of the bearing; the motorcycle includes the aforementioned protective structure for the bearing on the wheel axle, and during driving, mud and sand are not easy to enter the bearing, thereby avoiding wear on the bearing caused by the entry of mud and sand, thereby solving the noise problem caused by bearing wear and extending the service life of the bearing.

[0005] The technical solution is as follows:

[0006] One embodiment provides a protective structure for a bearing on an axle, comprising:

[0007] A gearbox and a wheel, wherein the gearbox outputs a wheel axle, a bearing is sleeved on the wheel axle, the wheel is drivingly connected to the wheel axle, the gearbox is provided with a first protection ring extending toward one side of the wheel, the wheel is provided with a second protection ring extending toward one side of the gearbox, the second protection ring and the first protection ring are both provided around the outer circumference of the bearing, and a first protection gap is formed between the second protection ring and the first protection ring;

[0008] The second guard ring is provided with a first annular groove, the first annular groove is provided on a side of the second guard ring facing the first guard ring, and the first annular groove is provided around the outer circumference of the second guard ring.

[0009] The above-mentioned protective structure for the bearing on the wheel axle, the first protective ring and the second protective ring both play a role in blocking dirt such as mud and sand, and a first protective gap is formed between the first protective ring and the second protective ring to increase the difficulty of mud and sand entering inward; and the second protective ring is also provided with a first annular groove, and the first annular groove makes it difficult for mud and sand entering the first protective gap to enter inward, thereby further preventing mud and sand from entering, avoiding mud and sand from entering the bearing, solving the noise problem caused by wear of the bearing due to the entry of mud and sand, and extending the service life of the bearing.

[0010] The technical solution is further described below:

[0011] In one embodiment, the second guard ring is located inside the first guard ring, the first guard gap is formed between the outer ring of the second guard ring and the inner ring of the first guard ring, the first annular groove is opened on the outer ring of the second guard ring; the notch of the first annular groove faces the inner ring of the first guard ring.

[0012] In one embodiment, the second guard ring is further provided with a second annular groove, which is arranged around the outer circumference of the second guard ring and is spaced apart from the first annular groove; the notch of the second annular groove faces the inner ring of the first guard ring.

[0013] In one embodiment, the second annular groove is located on the side of the first annular groove facing the gear box; the groove depth of the first annular groove is greater than the groove depth of the second annular groove or / and the groove width of the first annular groove is greater than the groove width of the second annular groove.

[0014] In one embodiment, the first annular groove is formed on the outer ring of the second protective ring in a spiral shape along the axial direction of the wheel axle.

[0015] In one embodiment, the first annular groove surrounds the second protective ring for at least two times, and in the axial direction of the axle toward the gear box, the groove depth of the first annular groove is gradually reduced or / and the groove width of the first annular groove is gradually reduced.

[0016] In one embodiment, the inner ring of the first protective ring is provided with a discharge groove, and the discharge groove corresponds to the position of the first annular groove; the discharge groove extends toward one side of the wheel and extends to the outside of the first protective ring.

[0017] In one embodiment, the wheel includes a hub, spokes and a rim, the hub is located inside the rim, two ends of the spokes are respectively connected to the outer ring of the hub and the inner ring of the rim, the hub is transmission-connected to the wheel axle; the second protective ring is arranged on the hub.

[0018] In one embodiment, the gearbox is provided with a mounting ring, the mounting ring extends toward one side of the wheel, the bearing is provided between an inner ring of the mounting ring and the wheel axle, and the mounting ring is located inside the ring of the first protective ring;

[0019] An extension ring is provided at the end of the mounting ring facing the wheel, and the extension ring extends toward the inner side of the mounting ring. An annular step is provided on the side of the wheel hub facing the extension ring, and the annular step is arranged along the circumference of the wheel hub and corresponds to the position of the extension ring. A second protective gap is formed between the extension ring and the annular step; the second protective gap is connected to the first protective gap, and the direction of the second protective gap is bent.

[0020] Another embodiment provides a motorcycle, comprising a protective structure for a bearing on a wheel axle as described in any of the above technical solutions.

[0021] The above-mentioned motorcycle adopts the aforementioned protective structure for the bearing on the wheel axle. During driving, mud and sand are not easy to enter the bearing, thereby avoiding the wear of the bearing caused by the entry of mud and sand, thereby solving the noise problem caused by bearing wear and extending the service life of the bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] In addition, the drawings are not drawn in a 1:1 scale, and the relative sizes of various elements are drawn only as examples in the drawings and are not necessarily drawn in true scale.

[0025] Figure 1 It is a schematic cross-sectional view of the assembly of a gearbox, a wheel, a tire, an axle and a bearing in an embodiment of the present invention;

[0026] Figure 2 for Figure 1 A schematic cross-sectional view of the assembly of the gearbox, wheels, axles and bearings in the embodiment;

[0027] Figure 3 for Figure 1 A schematic diagram of the structure of the first protection gap and the second protection gap in the embodiment;

[0028] Figure 4 for Figure 1 Schematic diagram of the structure of the first protection ring and the mounting ring of the gear box in the embodiment.

[0029] Notes on the attached drawings:

[0030] 100, gearbox; 110, axle; 120, bearing; 130, first protective ring; 131, discharge groove; 140, mounting ring; 141, extension ring; 200, wheel; 210, hub; 211, annular step; 220, spoke; 230, rim; 240, second protective ring; 241, first annular groove; 242, second annular groove; 243, third annular groove; 310, first protective gap; 320, second protective gap; 400, tire. DETAILED DESCRIPTION

[0031] The embodiments of the present invention are described in detail below with reference to the accompanying drawings:

[0032] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0033] Please refer to Figure 1 The gearbox 100 may be a part of the engine. The gearbox 100 outputs an axle 110. The axle 110 is sleeved with a bearing 120. The wheel 200 is connected to the axle 110 through a transmission. The tire 400 is sleeved on the outer ring of the wheel 200. When the engine is started, the axle 110 is driven to rotate, thereby driving the wheel 200 to rotate.

[0034] For example, when applied to a motorcycle, the wheel axle 110 may be the wheel axle 110 of the rear wheel. The rear wheel is more likely to pick up a large amount of dirt such as mud and sand during driving, and the dirt enters the bearing 120 of the wheel axle 110 through the space between the wheel 200 and the gear box 100, so that the bearing 120 is worn due to the presence of mud and sand, and the wear of the bearing 120 causes noise, shortens the service life of the bearing 120, and affects the overall power performance.

[0035] To do this, please refer to Figure 2 and Figure 3An embodiment provides a protective structure for a bearing 120 on an axle 110, including a gearbox 100 and a wheel 200, wherein the gearbox 100 outputs a wheel axle 110, the wheel axle 110 is sleeved with a bearing 120, the wheel 200 is transmission-connected to the wheel axle 110, the gearbox 100 is provided with a first protective ring 130 extending toward one side of the wheel 200, the wheel 200 is provided with a second protective ring 240 extending toward one side of the gearbox 100, the second protective ring 240 and the first protective ring 130 are both arranged around the outer circumference of the bearing 120, and a first protective gap 310 is formed between the second protective ring 240 and the first protective ring 130.

[0036] like Figure 2 and Figure 3 As shown, the second protection ring 240 is provided with a first annular groove 241 . The first annular groove 241 is provided on a side of the second protection ring 240 facing the first protection ring 130 . The first annular groove 241 is provided around the outer circumference of the second protection ring 240 .

[0037] In the protective structure for the bearing 120 on the axle 110, the first protective ring 130 and the second protective ring 240 both play a role in blocking dirt such as mud and sand. A first protective gap 310 is formed between the first protective ring 130 and the second protective ring 240 to increase the difficulty of mud and sand entering inwardly; and the second protective ring 240 is also provided with a first annular groove 241. The first annular groove 241 makes it difficult for mud and sand entering the first protective gap 310 to enter inwardly, thereby further preventing mud and sand from entering, avoiding mud and sand from entering into the bearing 120, solving the noise problem caused by wear of the bearing 120 due to the entry of mud and sand, and extending the service life of the bearing 120.

[0038] In one embodiment, please refer to Figure 2 and Figure 3 The first protection ring 130 and the second protection ring 240 are arranged alternately in the radial direction of the axle 110, and the gap between the first protection ring 130 and the second protection ring 240 forms a first annular gap, and the first annular groove 241 is opened on the side of the second protection ring 240 facing the first protection ring 130, that is, the notch of the first annular groove 241 is connected to the first annular gap. Under the blocking effect of the first protection ring 130 and the second protection ring 240, if dirt such as mud and sand still enters the first protection gap 310, the dirt such as mud and sand will enter the groove of the first annular groove 241. Due to the blocking effect of the groove wall of the first annular groove 241 and the centrifugal effect during driving, it is difficult for dirt such as mud and sand to move further inward, thereby preventing dirt such as mud and sand from entering the inside and preventing dirt such as mud and sand from affecting the normal operation of the bearing 120.

[0039] In one embodiment, please refer to Figure 2 and Figure 3 The second guard ring 240 is located inside the first guard ring 130 , the first guard gap 310 is formed between the outer ring of the second guard ring 240 and the inner ring of the first guard ring 130 , and the first annular groove 241 is opened on the outer ring of the second guard ring 240 .

[0040] like Figure 2 and Figure 3 As shown, the second protective ring 240 is located inside the first protective ring 130, and the first annular groove 241 is provided on the side of the second protective ring 240 facing the first protective ring 130. Therefore, when mud and sand enter from the outside, it is more difficult to enter further inward through the first annular groove 241, thereby solving the wear and noise problem caused by mud and sand entering the bearing 120.

[0041] In one embodiment, please refer to Figure 2 and Figure 3 The notch of the first annular groove 241 faces the inner ring of the first protective ring 130 .

[0042] like Figure 2 and Figure 3 In the illustrated embodiment, the first annular groove 241 may be a rectangular groove or an arc groove, and the groove opening is opened toward the inner ring of the first protection ring 130. The rectangular groove or the arc groove is more convenient to manufacture and has a blocking effect on mud and sand.

[0043] In one embodiment, please refer to Figures 2 to 4 The first protective ring 130 and the second protective ring 240 are both arranged around the outer circumference of the bearing 120 to better block the mud and sand.

[0044] Furthermore, the first protection ring 130 and the second protection ring 240 are both circular ring structures, and the first protection ring 130 and the second protection ring 240 are both coaxially arranged with the axle 110 .

[0045] like Figure 2 and Figure 3 In the illustrated embodiment, when the first protection ring 130 and the second protection ring 240 are projected in the radial direction of the axle 110 , the first protection ring 130 and the second protection ring 240 have an overlapping area, and the overlapping area corresponds to the first annular gap.

[0046] For example, in Figure 2 and Figure 3 In the illustrated viewing angle, when the first guard ring 130 and the second guard ring 240 are projected in the up-down direction, the right side portion of the first guard ring 130 and the left side portion of the second guard ring 240 overlap each other.

[0047] In one embodiment, please refer to Figure 2 and Figure 3 The second protection ring 240 is further provided with a second annular groove 242, which is arranged around the outer circumference of the second protection ring 240 and is spaced apart from the first annular groove 241. The notch of the second annular groove 242 faces the inner ring of the first protection ring 130.

[0048] like Figure 2 and Figure 3 In the illustrated embodiment, a second annular groove 242 is further provided on the side of the second protection ring 240 facing the first protection ring 130, and the second annular groove 242 is spaced apart from the first annular groove 241. The joint arrangement of the first annular groove 241 and the second annular groove 242 enables the first annular gap to roughly form a labyrinth channel structure, making it more difficult for mud and sand to enter, thereby protecting the bearing 120.

[0049] In one embodiment, please refer to Figure 2 and Figure 3 The second annular groove 242 is located on a side of the first annular groove 241 facing the gear box 100 .

[0050] In one embodiment, please refer to Figure 2 and Figure 3 The groove depth of the first annular groove 241 is greater than the groove depth of the second annular groove 242 or / and the groove width of the first annular groove 241 is greater than the groove width of the second annular groove 242.

[0051] like Figure 2 and Figure 3 In the illustrated embodiment, the second annular groove 242 is closer to the gearbox 100 than the first annular groove 241 , or the first annular groove 241 is closer to the exit position of the first annular gap.

[0052] like Figure 2 and Figure 3 In the illustrated embodiment, the groove depth of the first annular groove 241 is greater than the groove depth of the second annular groove 242 . The greater groove depth corresponds to a higher groove wall, thereby increasing the difficulty of mud and sand moving from the first annular groove 241 into the second annular groove 242 , preventing mud and sand from further entering, thereby protecting the bearing 120 .

[0053] The groove width of the first annular groove 241 can be larger than the groove width of the second annular groove 242. With this arrangement, the mud and sand in the first annular groove 241 located near the exit of the first annular gap can be more easily thrown out under the action of centrifugal force, thereby avoiding movement toward the inner second annular groove 242, thereby protecting the bearing 120.

[0054] In one embodiment, please refer to Figure 2 and Figure 3 The second protection ring 240 is further provided with a third annular groove 243 , and the second annular groove 242 is located between the first annular groove 241 and the third annular groove 243 .

[0055] like Figure 2 and Figure 3 As shown, the outer ring of the second protection ring 240 is generally in a tooth-shaped structure.

[0056] It should be noted that:

[0057] A plurality of annular grooves may be provided and arranged at intervals, so that the first annular gap forms a more complex maze structure, thereby increasing the difficulty of mud and sand entering. Of course, when setting, in the direction of the axle 110 toward the gear box 100, the groove depth of the annular groove is gradually reduced or / and the groove width of the annular groove is gradually reduced.

[0058] In one embodiment, the first annular groove 241 is formed on the outer ring of the second protective ring 240 in a spiral shape along the axial direction of the wheel axle 110 .

[0059] In this embodiment, the first annular groove 241 is spirally arranged on the second protective ring 240 to form a maze structure, so as to increase the difficulty of mud and sand entering.

[0060] In one embodiment, the first annular groove 241 surrounds the second protective ring 240 for at least two times, and in the axial direction of the axle 110 toward the gear box 100, the groove depth of the first annular groove 241 is gradually reduced and / or the groove width of the first annular groove 241 is gradually reduced.

[0061] Such arrangement ensures that the obstacle is continuously increased when the silt moves inward through the first annular gap, thereby preventing the silt from entering.

[0062] In one embodiment, please refer to Figure 4 The inner ring of the first protection ring 130 is provided with a discharge groove 131, and the discharge groove 131 corresponds to the position of the first annular groove 241. The discharge groove 131 extends toward one side of the wheel 200 and extends to the outside of the first protection ring 130.

[0063] like Figure 4 In the illustrated embodiment, the discharge groove 131 is disposed on the inner ring of the first protective ring 130, and the discharge groove 131 extends outward along the axial direction of the wheel axle 110. The position of the discharge groove 131 is located on the lower side of the first protective ring 130, and the position of the discharge groove 131 corresponds to the position of the first annular groove 241, so that dirt such as mud and sand in the first annular groove 241 can be discharged through the discharge groove 131.

[0064] It is understandable that:

[0065] When the groove width of the first annular groove 241 is larger and the groove depth of the first annular groove 241 is larger, it is equivalent to having enough space in the first annular groove 241. Then, the mud and sand in it are more easily thrown out under the centrifugal force of the wheel 200 and reach the discharge groove 131, and then discharged through the discharge groove 131.

[0066] In one embodiment, please refer to Figure 1 The wheel 200 includes a hub 210, a spoke 220 and a rim 230. The hub 210 is located inside the rim 230. Two ends of the spoke 220 are respectively connected to the outer ring of the hub 210 and the inner ring of the rim 230. The hub 210 is in driving connection with the axle 110. The second protective ring 240 is disposed on the hub 210.

[0067] In one embodiment, please refer to Figure 2 and Figure 3 The gear box 100 is provided with a mounting ring 140 , and the mounting ring 140 extends toward one side of the wheel 200 . The bearing 120 is provided between the inner ring of the mounting ring 140 and the wheel axle 110 . The mounting ring 140 is located inside the ring of the first protective ring 130 .

[0068] like Figure 2 and Figure 3 The embodiment shown and combined Figure 4 The mounting ring 140 and the first protective ring 130 are both circular rings, and the mounting ring 140 is located inside the first protective ring 130 . The outer ring of the bearing 120 cooperates with the inner ring of the mounting ring 140 , and the inner ring of the bearing 120 cooperates with the wheel axle 110 .

[0069] In one embodiment, please refer to Figure 3 An extension ring 141 is provided at the end of the mounting ring 140 facing the wheel 200. The extension ring 141 extends toward the inner side of the mounting ring 140. An annular step 211 is provided on the side of the wheel hub 210 facing the extension ring 141. The annular step 211 is arranged along the circumference of the wheel hub 210 and corresponds to the position of the extension ring 141. A second protective gap 320 is formed between the extension ring 141 and the annular step 211.

[0070] like Figure 2 and Figure 3 In the illustrated perspective, the bearing 120 is located between the mounting ring 140 and the axle 110 , and is located on a side of the extension ring 141 away from the wheel 200 .

[0071] like Figure 2 and Figure 3In the illustrated embodiment, the extension ring 141 extends from one end of the mounting ring 140 facing the wheel 200 toward the inner side of the mounting ring 140, and a ring step 211 is provided on one side of the wheel hub 210 facing the extension ring 141. The ring step 211 is integrally provided with the wheel hub 210, and the ring step 211 forms a notch at a position of the wheel hub 210 corresponding to the extension ring 141, so that a second protective gap 320 is formed between the extension ring 141 and the ring step 211. The second protective gap 320 plays a further role in blocking mud and sand.

[0072] In one embodiment, please refer to Figure 3 The second protective gap 320 is connected to the first protective gap 310, and the direction of the second protective gap 320 is bent.

[0073] like Figure 3 In the illustrated embodiment, the second protective gap 320 is connected to the first protective gap 310, and the second protective gap 320 roughly forms an L-shaped gap channel. Even if mud and sand enter the second protective gap 320 through the first protective gap 310, it still needs to pass through the bent portion of the second protective gap 320 to finally reach the bearing 120, thereby further increasing the difficulty for mud and sand to reach the bearing 120, thereby playing a protective role for the bearing 120.

[0074] Another embodiment provides a motorcycle, comprising the protection structure for the bearing 120 on the wheel axle 110 as described in any of the above embodiments.

[0075] The motorcycle adopts the aforementioned protective structure for the bearing 120 on the wheel axle 110. During driving, mud and sand are not easy to enter the bearing 120, thereby avoiding the wear of the bearing 120 caused by the entry of mud and sand, thereby solving the noise problem caused by the wear of the bearing 120 and extending the service life of the bearing 120.

[0076] like Figure 2 and Figure 3 In the embodiment shown, the second protective ring 240 is arranged in a tooth-shaped structure to form a first annular gap 310 in the form of a complex maze structure, and a second annular gap 320 is also arranged near the bearing 120, thereby preventing external mud and sand from entering the bearing 120, thereby achieving reliable protection for the bearing 120.

[0077] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0078] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0079] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0080] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0081] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0082] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0083] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A protective structure for a bearing on an axle, characterized in that: include: A gearbox and a wheel, wherein the gearbox outputs a wheel axle, a bearing is sleeved on the wheel axle, the wheel is drivingly connected to the wheel axle, the gearbox is provided with a first protection ring extending toward one side of the wheel, the wheel is provided with a second protection ring extending toward one side of the gearbox, the second protection ring and the first protection ring are both provided around the outer circumference of the bearing, and a first protection gap is formed between the second protection ring and the first protection ring; The second guard ring is provided with a first annular groove, the first annular groove is provided on a side of the second guard ring facing the first guard ring, and the first annular groove is provided around the outer circumference of the second guard ring; The second guard ring is located inside the first guard ring, the first guard gap is formed between the outer ring of the second guard ring and the inner ring of the first guard ring, the first annular groove is opened on the outer ring of the second guard ring; the notch of the first annular groove faces the inner ring of the first guard ring; The second guard ring is further provided with a second annular groove, which is arranged around the outer circumference of the second guard ring, and the second annular groove is arranged at an interval from the first annular groove; the notch of the second annular groove faces the inner ring of the first guard ring; The second annular groove is located on a side of the first annular groove facing the gear box; the groove width of the first annular groove is greater than the groove width of the second annular groove.

2. The protective structure for the bearing on the wheel axle according to claim 1, characterized in that: The inner ring of the first protection ring is provided with a discharge groove, and the discharge groove corresponds to the position of the first annular groove; the discharge groove extends toward one side of the wheel and extends to the outside of the first protection ring.

3. The protective structure for the bearing on the wheel axle according to claim 1, characterized in that: The wheel includes a hub, spokes and a rim, wherein the hub is located inside the rim, two ends of the spokes are respectively connected to an outer ring of the hub and an inner ring of the rim, and the hub is drivingly connected to the wheel axle; the second protective ring is arranged on the hub.

4. The protective structure for the bearing on the wheel axle according to claim 3, characterized in that: The gearbox is provided with a mounting ring, the mounting ring extends toward one side of the wheel, the bearing is provided between an inner ring of the mounting ring and the wheel axle, and the mounting ring is located inside the ring of the first protective ring; An extension ring is provided at the end of the mounting ring facing the wheel, and the extension ring extends toward the inner side of the mounting ring. An annular step is provided on the side of the wheel hub facing the extension ring, and the annular step is arranged along the circumference of the wheel hub and corresponds to the position of the extension ring. A second protective gap is formed between the extension ring and the annular step; the second protective gap is connected to the first protective gap, and the direction of the second protective gap is bent.

5. The protective structure for the bearing on the wheel axle according to claim 1, characterized in that: The groove depth of the first annular groove is greater than the groove depth of the second annular groove.

6. A motorcycle, characterized in that: It comprises a protective structure for a bearing on an axle as described in any one of claims 1 to 5.

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