Obstacle crossing wheel assembly and mower

Abstract

The utility model belongs to the technical field of power tools, and discloses an obstacle crossing wheel assembly and a mower, the obstacle crossing wheel assembly comprises a mounting bracket, the mounting bracket comprises two mounting arms which are oppositely arranged; the rolling wheel comprises a rolling wheel body, the rolling wheel body is rotationally connected between the two mounting arms, an avoiding gap is formed between the rolling wheel body and the mounting arms, and the rolling wheel body is arranged in a spherical shape or a sphere-like shape; the auxiliary obstacle crossing part is located in front of the rolling wheel in the advancing direction of the rolling wheel, the auxiliary obstacle crossing part is connected with the mounting arm and is suspended relative to the ground, and the distance between the lowest end of the auxiliary obstacle crossing part and the ground is smaller than or equal to the maximum obstacle crossing height of the rolling wheel body. The wheel set has the effects that the obstacle crossing difficulty of the wheel set is reduced, and the steering flexibility of the wheel set is improved.

Description

Technical Field

[0001] The present application relates to the technical field of power tools, and more specifically, to an obstacle-crossing wheel assembly and a lawn mower. Background Art

[0002] As one of the tools for lawn trimming, lawn mowers are widely used in urban greening, household weeding and other occasions.

[0003] Traditional lawn mowers include multiple wheel sets, and all wheel sets are in contact with the ground at the same time. However, when encountering stones, potholes or low steps, it is very difficult for the wheel sets of existing lawn mowers to smoothly cross such obstacles and continue to move forward relying on the wheels themselves, thus reducing the working efficiency of the lawn mower; secondly, traditional wheel sets need to turn the wheels to be in the same direction as the direction of the applied external force before they can roll. When the wheels are turned due to collision with obstacles, traditional wheel sets need a process to adjust the direction of the wheels and cannot directly turn in place, so the steering flexibility is poor.

[0004] In view of the above technical means, there are defects that the wheel sets of lawn mowers have difficulty in crossing obstacles and poor steering flexibility. Utility Model Content

[0005] The embodiments of the present application provide an obstacle-crossing wheel assembly, which can reduce the difficulty of the wheel set in crossing obstacles and improve the steering flexibility of the wheel set.

[0006] In a first aspect, the present application provides an obstacle-crossing wheel assembly, adopting the following technical solutions:

[0007] An obstacle-crossing wheel assembly, comprising:

[0008] A mounting bracket, the mounting bracket includes two oppositely arranged mounting arms;

[0009] A rolling wheel, the rolling wheel includes a roller body, the roller body is rotatably connected between the two mounting arms, there is a clearance between the roller body and the mounting bracket, and the roller body is arranged in a spherical or quasi-spherical shape;

[0010] An auxiliary obstacle-crossing component, the auxiliary obstacle-crossing component is located in front of the rolling wheel in the traveling direction of the rolling wheel, the auxiliary obstacle-crossing component is connected to the mounting arm and is suspended relative to the ground, and the distance from the lowest end of the auxiliary obstacle-crossing component to the ground is less than or equal to the maximum obstacle-crossing height of the roller body.

[0011] Optionally, the obstacle-crossing auxiliary component includes an extension part and an auxiliary wheel, one end of the extension part is connected to the mounting bracket, the other end of the extension part extends forward along the traveling direction, the auxiliary wheel is rotatably arranged at the other end of the extension part, and the distance from the lowest end of the auxiliary wheel to the ground is less than or equal to the maximum obstacle-crossing height of the roller body.

[0012] Optionally, the auxiliary obstacle-crossing component includes a connecting part and a guiding part. One end of the connecting part is connected to the mounting bracket, and the other end of the connecting part is connected to the guiding part. The guiding part is located in front of the rolling wheel, and one side thereof for contacting the obstacle is inclined.

[0013] Optionally, the guiding part includes a first side edge, a second side edge, and a third side edge that are sequentially connected. The first side edge and the third side edge are also respectively connected to the connecting part. The second side edge is used for contacting an obstacle in the traveling direction and is inclined upward in the traveling direction.

[0014] Optionally, the connecting part includes a first connecting section and a second connecting section. One end of the second connecting section is connected to the guiding part and is disposed at an angle. The other end of the second connecting section is connected to the first connecting section and is disposed at an angle. There is an avoidance notch between the guiding part and the first connecting section.

[0015] Optionally, the rolling wheel further includes a second rotating shaft and a bearing. The second rotating shaft is located on the axis of the roller body and penetrates the roller body. Two ends of the second rotating shaft are respectively connected to the two mounting arms; the inner wall of the bearing is connected to the second rotating shaft, and the outer wall of the bearing is connected to the roller body.

[0016] Optionally, the roller body includes a rolling part and an avoidance part. Along the traveling direction, the avoidance part is located on both sides of the rolling part, and the outer peripheral wall of the avoidance part is an arc surface or an inclined plane.

[0017] Optionally, the avoidance part is provided with a mounting plane corresponding to the outer peripheral wall of the mounting arm. The second rotating shaft penetrates the center of the mounting plane. The plane where the mounting plane is located is perpendicular to the second rotating shaft, and there is an accommodation gap between the mounting plane and the mounting arm.

[0018] Optionally, the mounting plane is perpendicular to the second rotating shaft. The height of the lowest point of the mounting plane is between 1 / 4 and 1 / 3 of the diameter of the roller body. The lowest point of the guiding part is set lower than or equal to the lowest point of the mounting plane.

[0019] In a second aspect, the present application provides a lawn mower, adopting the following technical solution:

[0020] A lawn mower adopts the obstacle-crossing wheel assembly as described above.

[0021] It can be seen from the above technical solutions that the embodiments of the present application have the following advantages:

[0022] When the obstacle-crossing wheel assembly encounters an obstacle, the auxiliary obstacle-crossing component can contact the obstacle prior to the roller body. Driven by the forward driving force, the auxiliary obstacle-crossing component slides along the obstacle. By means of the auxiliary obstacle-crossing component, the roller body can be smoothly lifted, increasing the distance between the roller body and the ground, enabling the roller body to cross the obstacle or roll along the obstacle under the drive of the forward driving force, reducing the difficulty of the roller body in crossing the obstacle, and assisting the roller body in crossing the obstacle. At the same time, since the roller body is spherical or quasi-spherical, even if the roller body rotates due to encountering an obstacle during obstacle crossing, causing deviation from the traveling direction, the roller body can quickly return to a state parallel to the traveling direction under the forward driving force through the mounting bracket and continue to move forward, improving the steering flexibility of the rolling wheel. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present application. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.

[0024] Figure 1 FIG. 1 is a schematic diagram of the overall structure of an obstacle-crossing wheel assembly disclosed in Embodiment 1 of the present application;

[0025] Figure 2 FIG. 2 is a front view of an obstacle-crossing wheel assembly disclosed in Embodiment 1 of the present application;

[0026] Figure 3 FIG. 3 is a top view of an obstacle-crossing wheel assembly disclosed in Embodiment 2 of the present application;

[0027] Figure 4 FIG. 4 is a front view of an obstacle-crossing wheel assembly disclosed in Embodiment 2 of the present application;

[0028] Figure 5 FIG. 5 is a schematic diagram of the overall structure of an obstacle-crossing wheel assembly disclosed in Embodiment 2 of the present application;

[0029] Figure 6 FIG. 6 is a schematic diagram of the overall structure of an obstacle-crossing wheel assembly disclosed in Embodiment 3 of the present application.

[0030] DESCRIPTION OF REFERENCE NUMERALS:

[0031] 1, mounting bracket; 11, mounting arm; 12, connecting plate; 13, first rotating shaft; 2, rolling wheel; 21, roller body; 211, rolling part; 212, avoiding part; 213, contact end; 214, mounting plane; 215, anti-slip lines; 22, second rotating shaft; 3, auxiliary obstacle-crossing component; 31, connecting part; 311, first connecting section; 312, second connecting section; 32, guiding part; 321, first side; 322, second side; 323, third side. Detailed implementation manners

[0032] The following further elaborates on this application with reference to the accompanying drawings.

[0033] The embodiment of this application provides an obstacle - crossing wheel assembly and a lawn mower. This obstacle - crossing wheel assembly can reduce the difficulty of the wheel set in crossing obstacles and improve the steering flexibility of the wheel set, enabling the lawn mower to successfully cross obstacles when encountering them. At the same time, the wheel set can rotate flexibly to achieve in - place steering and then continue to move forward.

[0034] In order to enable those skilled in the art to better understand the solution of this invention, the technical solutions in the embodiments of this invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this invention. Obviously, the described embodiments are only a part of the embodiments of this invention, rather than all of them. Based on the embodiments of this invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this invention. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by this application.

[0035] The terms "first", "second", "third", "fourth", etc. in the specification, claims and above - mentioned drawings of this invention are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances so that the embodiments described here can be implemented in an order different from that shown or described here. In addition, the terms "comprising" and "having" and any of their variations are intended to cover non - exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0036] Traditional lawn mowers include multiple wheel sets, and all wheel sets are in contact with the ground simultaneously. However, when encountering stones, potholes or relatively low steps, it is very difficult for the wheel sets of existing lawn mowers to smoothly cross such obstacles and continue to move forward relying on the wheels themselves, thus reducing the working efficiency of the lawn mower. Secondly, traditional wheel sets need to turn the wheels to the same direction as the direction of the applied external force before they can roll. When the wheels turn due to collision with obstacles, traditional wheel sets need a process to adjust the direction of the wheels and cannot directly perform in - place steering, so the steering flexibility is poor. To solve the above problems, this application provides an obstacle - crossing wheel assembly. Please refer to Figure 1, which is an embodiment of the obstacle-crossing wheel assembly in the present application, includes: a mounting bracket 1, a rolling wheel 2, and an auxiliary obstacle-crossing component 3. The rolling wheel 2 is rotatably mounted on the mounting bracket 1. The mounting bracket 1 is rotatably matched with the body of the walking device. The mounting bracket 1 and the rolling wheel 2 cooperate to perform universal rotation relative to the body of the walking device. The auxiliary obstacle-crossing component 3 is located in front of the rolling wheel 2 in the traveling direction of the rolling wheel 2. The auxiliary obstacle-crossing component 3 is mounted on the mounting bracket 1 and is suspended relative to the ground. The distance from the lowest end of the auxiliary obstacle-crossing component 3 to the ground is less than or equal to the maximum obstacle-crossing height of the rolling wheel 2. When encountering an obstacle, the auxiliary obstacle-crossing component 3 preferentially contacts the obstacle to raise the height between the rolling wheel 2 and the ground for auxiliary obstacle crossing. The traveling direction of the rolling wheel 2 refers to the forward traveling direction of the traveling device and does not include the backward movement direction of the lawn mowing robot.

[0037] Please refer to Figure 1 and Figure 2 , the mounting bracket 1 includes a connecting plate 12 and two relatively arranged mounting arms 11. The connecting plate 12 is located between the two mounting arms 11, and both sides of the connecting plate 12 are fixedly connected to the same-side ends of the two mounting arms 11. The ends of the mounting arms 11 that are not connected to the connecting plate 12 are connected to the rolling wheel 2.

[0038] A first rotating shaft 13 is provided on the end face of the connecting plate 12 facing away from the rolling wheel 2. One end of the first rotating shaft 13 is fixedly connected to the connecting plate 12, and the other end of the first rotating shaft 13 is rotatably connected to the body of the walking device. The body of the walking device drives the first rotating shaft 13 to rotate, and the first rotating shaft 13 thus drives the mounting bracket 1 and the rolling wheel 2 to rotate synchronously, thereby realizing the universal adjustment of the obstacle-crossing wheel assembly. In the embodiment of the present application, the first rotating shaft 13 is perpendicular to the horizontal plane, and the first rotating shaft 13 is located at the center position of the connecting plate 12, so that the acting force from the body of the walking device can be evenly distributed on both sides of the rolling wheel 2.

[0039] There are two auxiliary obstacle-crossing components 3. The two auxiliary obstacle-crossing components 3 are respectively mounted on the two mounting arms 11 and are arranged in one-to-one correspondence. The setting of the two auxiliary obstacle-crossing components 3 facilitates maintaining the stability of the obstacle crossing of the rolling wheel 2. When the obstacle-crossing wheel assembly encounters an obstacle, the auxiliary obstacle-crossing component 3 preferentially contacts the obstacle. Driven by the forward acting force, the auxiliary obstacle-crossing component 3 slides with the obstacle. The rolling wheel 2 can be smoothly lifted by the two auxiliary obstacle-crossing components 3, increasing the distance between the rolling wheel 2 and the ground to lift the rolling wheel 2, so that the rolling wheel 2 can cross the obstacle or roll along the obstacle under the drive of the forward acting force, reducing the obstacle-crossing difficulty of the rolling wheel 2, and thus assisting the rolling wheel 2 to cross the obstacle.

[0040] Please refer to Figure 2 and Figure 3, the rolling wheel 2 includes a roller body 21, a second rotating shaft 22 and a bearing 23. The roller body 21 is arranged in a spherical or quasi-spherical shape. The roller body 21 is rotatably connected between two mounting arms 11, and there is a clearance between the roller body 21 and the mounting bracket 1. The second rotating shaft 22 is located on the axis of the roller body 21 and penetrates the roller body 21. The two ends of the second rotating shaft 22 are respectively connected to the two mounting arms 11. The inner wall of the bearing 23 is connected to the second rotating shaft 22, and the outer wall of the bearing 23 is connected to the roller body 21. In this embodiment, the roller body 21 is rotatably connected to the second rotating shaft 22. The two ends of the second rotating shaft 22 are fixedly connected to the two mounting arms 11. The inner wall of the bearing 23 is rotatably connected to the second rotating shaft 22, and the outer wall of the bearing 23 is fixedly connected to the roller body 21. The bearing 23 can reduce the friction between the roller body 21 and the second rotating shaft 22. In some other embodiments, the roller body 21 is fixedly connected to the second rotating shaft 22, and the two ends of the second rotating shaft 22 are rotatably connected to the two mounting arms 11, which can also realize the rotational connection of the rolling wheel 2 to the mounting bracket 1.

[0041] The roller body 21 contacts the ground. The second rotating shaft 22 is the rotation center axis of the roller body 21. Driven by the forward acting force, the roller body 21 rolls along the traveling direction to carry the movement of the walking device. Since the roller body 21 is spherical or quasi-spherical, the width of the roller body 21 is wider than that of a disc-shaped roller and can cover small-sized potholes on the ground. In this embodiment, the roller body 21 is a sphere or quasi-sphere with a diameter of 12 cm, and the roller body 21 of this size can cover potholes with a size of 5 - 7 cm. With the cooperation of the auxiliary obstacle-crossing component 3, during the obstacle-crossing process, even if the roller body 21 rotates due to encountering an obstacle and deviates from the traveling direction, the roller body 21 can change the contact point position with the ground under the forward acting force, so that the roller body 21 has more contact points with the ground during rotation, can automatically adjust to the required direction with the smallest rotation angle, and the roller body 21 can more easily and quickly return to a state parallel to the traveling direction, thereby continuing to move forward and improving the steering flexibility of the rolling wheel 2.

[0042] Please refer to Figure 2 and Figure 3 , the roller body 21 includes a rolling part 211 and a clearance part 212. The rolling part 211 is used to contact the ground along the traveling direction of the roller body 21. The clearance part 212 is located on both sides of the rolling part 211. The outer peripheral wall of the clearance part 212 is an arc surface or an inclined plane. Compared with a disc-shaped roller, the outer peripheral wall of the clearance part 212 can smoothly guide the roller body 21. The arc-shaped clearance part 212 makes the steering of the roller body 21 smoother than the inclined plane-shaped clearance part 212. The outer peripheral wall of the inclined plane-shaped clearance part 212 is used to reduce the overall volume of the roller body 21 and avoid some obstacles in the traveling direction.

[0043] The avoidance part 212 is provided with an installation plane 214 corresponding to the outer peripheral wall of the installation arm 11. The installation plane 214 is obtained by cutting a part of the roller body 21. There is an accommodation gap between the installation plane 214 and the installation arm 11, which can reduce the possibility of grass entanglement between the roller body 21 and the installation arm 11 during the traveling process of the roller body 21.

[0044] Please refer to Figure 3 Furthermore, along the traveling direction of the roller body 21, the end of the rolling part 211 close to the obstacle is the contact end 213. The distance between the center point of the first rotating shaft 13 and the outer peripheral wall of the contact end 213 is L1; perpendicular to the traveling direction of the roller body 21, the distance between the center point of the first rotating shaft 13 and the outer peripheral wall of the avoidance part 212 is L2, and L1 < L2. That is, the first rotating shaft 13 is located on one side of the central axis of the roller body 21 perpendicular to the traveling direction, and the first rotating shaft 13 is close to the contact end 213. This setting further enables the rolling wheel 2 to easily rotate back to a state parallel to the advancing direction under the action of the advancing force when the rolling wheel 2 rotates when encountering an obstacle, or even when the rolling wheel 2 rotates to a state perpendicular to the traveling direction.

[0045] Please refer to Figure 4 and Figure 5 In some embodiments, the outer peripheral wall of the rolling part 211 is provided with anti-slip lines 215 for increasing friction. When the rolling part 211 contacts the ground, the anti-slip lines 215 increase the friction between the rolling part 211 and the ground under the drive of the advancing force, so as to enhance the grip of the roller body 21 and reduce the occurrence of slipping of the roller body 21.

[0046] Please refer to Figure 1 or Figure 5 In some embodiments, the auxiliary obstacle-crossing component 3 includes a connecting part 31 and a guiding part 32. One end of the connecting part 31 is connected to the mounting bracket 1, and the other end of the connecting part 31 is connected to the guiding part 32. The connecting part 31 and the guiding part 32 are integrally formed. The guiding part 32 is located in front of the rolling wheel 2 and the side thereof for contacting the obstacle is inclined.

[0047] Specifically, the connecting part 31 and the installation arm 11 are fixedly connected by bolts, which is convenient for disassembling and replacing the auxiliary obstacle-crossing component 3. The connecting part 31 includes a first connecting section 311 and a second connecting section 312. One end of the second connecting section 312 is connected to the guiding part 32 and is arranged at an angle. The other end of the second connecting section 312 is connected to the first connecting section 311 and is arranged at an angle. There is an avoidance notch between the guiding part 32 and the first connecting section 311. When the walking device turns left and right, the avoidance notch effectively reduces the resistance of the obstacle on the side of the auxiliary obstacle-crossing component 3 to the walking device, so as to ensure that the walking device can turn left and right smoothly.

[0048] The guiding part 32 includes a first side 321, a second side 322, and a third side 323 that are sequentially connected. The first side 321 and the third side 323 are also respectively connected to the connecting part 31. The second side 322 is used to contact an obstacle in the traveling direction and slopes upward in the traveling direction, and the inclination angle is set between 35 degrees and 45 degrees. The inclination angle of the second side 322 is small enough so that under the drive of the forward acting force, it is ensured that the auxiliary obstacle avoidance component 3 can slide relative to the obstacle through the second side 322, and the possibility of the auxiliary obstacle avoidance component 3 being jammed against the obstacle is reduced.

[0049] The intersection of the second side 322 and the third side 323 is the lowest point of the guiding part 32, that is, the lowest end of the auxiliary obstacle crossing component 3. The distance from the lowest point of the guiding part 32 to the ground is less than or equal to the maximum obstacle crossing height of the roller body 21, and the lowest point of the guiding part 32 is set lower than or equal to the lowest point of the installation plane. Specifically, along the axial direction of the first rotating shaft 13, the height of the lowest point of the installation plane 214 is between 1 / 4 and 1 / 3 of the diameter of the roller body 21. It can be understood that at the position of 1 / 4 to 1 / 3 of the diameter of the roller body 21, the obstacle crossing effect of the rolling wheel 2 is poor. Therefore, the lowest point of the guiding part 32 is set lower than or equal to the lowest point of the installation plane 214, and the auxiliary obstacle crossing component 3 can assist the rolling wheel 2 to smoothly cross the obstacle. That is, the second side 322 first contacts the obstacle in front. Under the drive of the forward acting force, the guiding part 32 slides in the direction obliquely forward and upward along the inclination angle of the second side 322, and the roller body 21 is gradually lifted up along with the auxiliary obstacle crossing component 3, so that the traveling direction of the roller body 21 is an inclined upward direction. Therefore, it is ensured that the rolling wheel 2 can smoothly cross the obstacle.

[0050] Please refer to Figure 6 , in some embodiments, the auxiliary obstacle crossing component 3 includes an extension part 33 and an auxiliary wheel 34. One end of the extension part 33 is connected to the mounting bracket 1, and the other end of the extension part 33 extends forward in the traveling direction. The auxiliary wheel 34 is rotatably arranged at the other end of the extension part 33. The distance from the lowest end of the auxiliary wheel 34 to the ground is less than or equal to the maximum obstacle crossing height of the roller body 21. When encountering an obstacle, the auxiliary wheel 34 preferentially contacts the obstacle, and the auxiliary wheel 34 rolls on the surface of the obstacle to lift the height of the roller body 21 from the ground, so that the rolling wheel 2 can smoothly cross the obstacle.

[0051] The present application also discloses a lawn mower that employs the above-described obstacle-crossing wheel assembly. When the lawn mowing robot is in the process of moving forward, if the obstacle-crossing wheel assembly encounters an obstacle ahead, since the auxiliary obstacle-crossing component 3 extends in front of the advancing direction of the rolling wheel 2, the second side 322 of the guiding portion 32 first abuts against the obstacle ahead. Driven by the forward driving force of the lawn mowing robot, the auxiliary obstacle-crossing component 3 moves obliquely upward relative to the obstacle through the second side 322, and the rolling wheel 2 gradually rises along with the auxiliary obstacle-crossing component, so that the rolling wheel 2 can smoothly cross the obstacle. At the same time, the roller body 21 is generally spherical or quasi-spherical, so that during the obstacle-crossing process, even if the roller body 21 rotates due to encountering an obstacle and causes an offset from the advancing direction, the roller body 21 can also change the position of the contact point with the ground under the forward driving force, and automatically adjust to the required direction with the smallest rotation angle, and more easily and quickly return to a state parallel to the advancing direction, so as to continue to move forward, thereby improving the mowing efficiency of the lawn mower.

[0052] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An obstacle-crossing wheel assembly, characterized in that: include: A mounting bracket, the mounting bracket comprising two mounting arms arranged opposite to each other; A rolling wheel, the rolling wheel comprising a rolling wheel body, the rolling wheel body being rotatably connected between the two mounting arms, an avoidance gap being provided between the rolling wheel body and the mounting bracket, and the rolling wheel body being arranged in a spherical or quasi-spherical shape; An auxiliary obstacle-crossing component, wherein the auxiliary obstacle-crossing component is located in front of the rolling wheel in the direction of travel of the rolling wheel, the auxiliary obstacle-crossing component is connected to the mounting arm and is suspended relative to the ground, and the distance from the lowest end of the auxiliary obstacle-crossing component to the ground is less than or equal to the maximum obstacle-crossing height of the roller body.

2. The obstacle-crossing wheel assembly according to claim 1, characterized in that: The auxiliary obstacle crossing component includes an extension portion and an auxiliary wheel, one end of the extension portion is connected to the mounting bracket, the other end of the extension portion extends forward along the traveling direction, the auxiliary wheel is rotatably provided at the other end of the extension portion, and the distance from the lowest end of the auxiliary wheel to the ground is less than or equal to the maximum obstacle crossing height of the roller body.

3. The obstacle-crossing wheel assembly according to claim 1, characterized in that: The auxiliary obstacle crossing component includes a connecting part and a guiding part, one end of the connecting part is connected to the mounting bracket, and the other end of the connecting part is connected to the guiding part. The guiding part is located in front of the rolling wheel and its side for contacting the obstacle is inclined.

4. The obstacle-crossing wheel assembly according to claim 3, characterized in that: The guiding portion includes a first side, a second side and a third side connected in sequence, the first side and the third side are also connected to the connecting portion respectively, and the second side is used to contact an obstacle in the traveling direction and tilt upward toward the traveling direction.

5. The obstacle-crossing wheel assembly according to claim 3, characterized in that: The connecting portion includes a first connecting segment and a second connecting segment, one end of the second connecting segment is connected to the guide portion and is arranged at an angle, the other end of the second connecting segment is connected to the first connecting segment and is arranged at an angle, and a avoidance gap is provided between the guide portion and the first connecting segment.

6. The obstacle-crossing wheel assembly according to claim 3, characterized in that: The rolling wheel also includes a second rotating shaft and a bearing. The second rotating shaft is located on the axis of the roller body and passes through the roller body. The two ends of the second rotating shaft are respectively connected to the two mounting arms; the inner wall of the bearing is connected to the second rotating shaft, and the outer wall of the bearing is connected to the roller body.

7. The obstacle-crossing wheel assembly according to claim 6, characterized in that: The roller body comprises a rolling portion and an avoidance portion. Along the traveling direction, the avoidance portions are located at two sides of the rolling portion, and the outer peripheral wall of the avoidance portion is an arc surface or an inclined plane.

8. The obstacle-crossing wheel assembly according to claim 7, characterized in that: The avoidance portion is provided with a mounting plane corresponding to the outer peripheral wall of the mounting arm, the second rotating shaft is penetrated through the center of the mounting plane, the plane where the mounting plane is located is perpendicular to the second rotating shaft, and there is an accommodating gap between the mounting plane and the mounting arm.

9. The obstacle-crossing wheel assembly according to claim 8, characterized in that: The installation plane is perpendicular to the second rotating shaft, the lowest point of the installation plane is located between 1 / 4 and 1 / 3 of the diameter of the roller body, and the lowest point of the guide portion is set lower than or equal to the lowest point of the installation plane.

10. A lawn mower, characterized in that: The invention comprises an obstacle-crossing wheel assembly as claimed in any one of claims 1 to 9.

Images