Belt wheel fixing structure and swimming pool cleaning robot

Abstract

The utility model provides a belt wheel fixing structure and a swimming pool cleaning robot, the belt wheel fixing structure comprises a main shell, a synchronous belt wheel and a rotating bearing, the main shell is provided with a first circumferential part, the synchronous belt wheel is used for being matched with a synchronous belt for transmission, and the rotating bearing is arranged on the main shell. The synchronous belt wheel comprises a belt wheel disc and a second circumferential part formed by axially extending the belt wheel disc, the first circumferential part and the second circumferential part are coaxially arranged, and the rotating bearing is fixed between the first circumferential part and the second circumferential part. According to the belt wheel fixing structure and the swimming pool cleaning robot, the rotating bearing is arranged between the first circumferential part and the second circumferential part, so that the synchronous belt wheel rotates more smoothly relative to the main shell, resistance is smaller, motor current is small, operation is stable, durability is achieved, the service life of the swimming pool robot is directly prolonged, and user experience is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of robots, and more specifically, relates to a wheel fixing structure and a swimming pool cleaning robot. Background Art

[0002] The pool cleaning robot can move on the bottom and side walls of the pool, and remove dirt in the pool by filtering, brushing, etc. It can replace manpower to clean the pool, and has a high cleaning efficiency. It can also reach every corner of the pool, including some areas that are difficult to clean manually.

[0003] Tracked pool cleaning robots use a pulley drive mechanism to propel the tracks, allowing the robot to reach the cleaning area. However, these pulleys are typically mounted directly on the robot's main housing, requiring high precision assembly. This results in uneven rotation and high resistance, which in turn causes the motor to draw high current and easily overheat and damage, directly impacting the robot's lifespan and user experience. Utility Model Content

[0004] The purpose of the embodiments of the present utility model is to provide a pulley fixing structure and a swimming pool cleaning robot to solve the technical problem in the prior art that the pulley is directly installed on the main housing of the robot, resulting in unsmooth rotation.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: to provide a pulley fixing structure for a pulley transmission mechanism, including a main housing, a synchronous pulley and a rotating bearing, the main housing having a first circumferential portion, the synchronous pulley being used to cooperate with the synchronous belt for transmission, the synchronous pulley including a pulley disc and a second circumferential portion axially extended from the pulley disc, the first circumferential portion and the second circumferential portion being coaxially arranged, and the rotating bearing being fixed between the first circumferential portion and the second circumferential portion.

[0006] In the above scheme, the pulley fixing structure includes a main shell, a synchronous pulley and a rotating bearing. The synchronous pulley includes a pulley disc and a second circumferential portion. The main shell has a first circumferential portion. The rotating bearing is arranged between the first circumferential portion and the second circumferential portion, so that the rotation of the synchronous pulley relative to the main shell is smoother, with less resistance, small motor current, stable operation, and durability, which directly increases the service life of the swimming pool robot and improves the user experience.

[0007] Optionally, the pulley fixing structure also includes a limiting pressure plate and a locking member. The second circumferential portion is arranged on the outer periphery of the first circumferential portion. The outer circumferential wall of the first circumferential portion has a step structure. The inner wall of the second circumferential portion extends radially inward to form a limiting portion. The locking member passes through the pressure plate and is locked to the first circumferential portion, so that the rotating bearing and the limiting portion are axially pressed at the step structure.

[0008] In the above scheme, by setting the limiting pressure plate and the locking member, the first circumferential part, the second circumferential part and the rotating bearing can be axially limited and locked to prevent the second circumferential part and the rotating bearing from axially moving relative to the first circumferential part.

[0009] Optionally, there are two rotating bearings, and the step structure, one of the rotating bearings, the limiting portion, the other rotating bearing, and the limiting pressure plate are arranged in sequence along the axial direction. The limiting portion extends to abut against the outer ring of the rotating bearing, and the limiting portion is spaced apart from the first circumferential portion.

[0010] In the above solution, by setting two rotating bearings, there can be at least two supporting positions between the first circumferential portion and the second circumferential portion, thereby making the rotation of the second circumferential portion relative to the first circumferential portion more stable and the rotation of the synchronous pulley smoother.

[0011] Optionally, the limiting portion includes a first limiting segment and a second limiting segment connected to each other, the axial width of the first limiting segment is smaller than the axial width of the second limiting segment, and one end of the first limiting segment abuts against the outer ring of one of the rotating bearings.

[0012] In the above solution, by providing the first and second limiting sections with different axial widths and making the limiting portion only abut against the outer ring of the rotating bearing, the normal rotation of the rotating bearing is ensured and the limiting portion is easier to install.

[0013] Optionally, the pulley fixing structure also includes a fixed bracket and a roller brush assembly, the fixed bracket includes a fixed plate and a fixed shaft connected to each other, the fixed plate is fixedly connected to the pulley disc, and the fixed shaft is arranged through the first circumferential portion; the fixed shaft is a hollow structure, and the roller brush rotating shaft of the roller brush assembly is arranged through the fixed shaft.

[0014] In the above scheme, the synchronous pulley and the roller brush assembly are moved synchronously by setting a fixed bracket. In this way, when the pool cleaning robot moves, the roller brush assembly rolls at the same time. There is no need to set up an additional roller brush drive mechanism, which reduces the power system of the pool cleaning robot, makes the pool cleaning robot have fewer parts, and is easier to assemble.

[0015] Optionally, the roller brush assembly includes a roller brush shaft and a roller brush body mounted on the roller brush shaft, a transmission hole is opened at one end of the roller brush body, and one end of the fixed shaft has a transmission part for extending into the transmission hole, and the transmission part and the transmission hole cooperate with each other to make the fixed shaft and the roller brush body rotate synchronously.

[0016] In the above scheme, a transmission hole is set at one end of the roller brush body, and a transmission part is set at one end of the fixed shaft. The rotation of the fixed bracket is transmitted to the roller brush body through the mutual cooperation of the transmission hole and the transmission part, and the rotation of the roller brush body is realized without the need for other fixed structures.

[0017] Optionally, the roller brush body includes a roller brush bracket and bristles fixed to the outer peripheral wall of the roller brush bracket, the roller brush bracket includes a roller brush cylinder and a roller brush end wall connected to one end of the roller brush cylinder, the roller brush end wall is recessed to form the transmission hole, and the roller brush end wall is provided with a shaft hole at the bottom of the transmission hole, and extends axially from the shaft hole to form a wrapping wall, and the wrapping wall is for the roller brush shaft to pass through.

[0018] In the above solution, the bottom of the transmission hole stops the transmission part, forming an axial limit for the fixed shaft and the roller brush body. By extending the wrapping wall formed at the bottom of the transmission hole, the roller brush shaft can be radially limited, thereby ensuring a more stable connection between the roller brush shaft and the roller brush bracket, reducing roller brush shaft wobble and improving the quality of the robot.

[0019] Optionally, the roller brush shaft extends out of the fixed bracket, and a retaining spring is fixed to the extended end of the roller brush shaft.

[0020] In the above solution, the axial positions of the fixed bracket and the roller brush shaft can be positioned by providing the retaining spring, thereby preventing the roller brush shaft from moving inside the fixed bracket.

[0021] Optionally, the fixing plate extends toward the pulley disc to form an annular positioning portion, and the annular positioning portion extends into the interior of the second circumferential portion.

[0022] In the above solution, by providing the annular positioning portion, when the fixing bracket is installed, the cooperation between the annular positioning portion and the second circumferential portion can radially position the fixing bracket, thereby preventing the fixing bracket from being installed dislocated.

[0023] The utility model also provides a swimming pool cleaning robot, comprising the above-mentioned pulley fixing structure.

[0024] In the above scheme, the pulley fixing structure includes a main shell, a synchronous pulley and a rotating bearing. The synchronous pulley includes a pulley disc and a second circumferential portion. The main shell has a first circumferential portion. The rotating bearing is arranged between the first circumferential portion and the second circumferential portion, so that the rotation of the synchronous pulley relative to the main shell is smoother, with less resistance, small motor current, stable operation, and durability, which directly increases the service life of the swimming pool robot and improves the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] 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 embodiments or descriptions of the prior art. 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 paying any creative work.

[0026] Figure 1 A three-dimensional structural diagram of a pulley transmission mechanism provided in an embodiment of the present utility model;

[0027] Figure 2 An exploded structural diagram of a pulley fixing structure provided by an embodiment of the present utility model;

[0028] Figure 3 A cross-sectional structural diagram of a pulley fixing structure provided by an embodiment of the present utility model;

[0029] Figure 4 for Figure 3 A partial enlarged view of the upper right corner;

[0030] Figure 5 A three-dimensional structural diagram of a synchronous pulley provided in an embodiment of the utility model;

[0031] Figure 6 A three-dimensional structural diagram of a fixing bracket provided in an embodiment of the utility model.

[0032] Among them, the reference numerals in the figures are:

[0033] 10 - Main housing; 11 - First circumferential portion; 12 - Second connecting hole; 13 - Step structure; 20 - Synchronous pulley; 21 - Pulley disc; 210 - Fourth connecting hole; 22 - Second circumferential portion; 23 - Position-limiting portion; 231 - First position-limiting section; 232 - Second position-limiting section; 30 - Rotating bearing; 40 - Position-limiting pressure piece; 41 - First connecting hole; 42 - Circumferential positioning hole; 50 - Fixing bracket; 51 - Fixing plate; 510 - Third connecting hole; 511-annular boss; 512-annular positioning part; 52-fixed shaft; 521-transmission part; 61-locking member; 62-fixing member; 63-circlip; 64-gasket; 70-synchronous belt; 80-roller brush assembly; 81-roller brush body; 82-roller brush bracket; 820-transmission hole; 821-roller brush cylinder; 822-roller brush end wall; 823-hole wall; 824-stop wall; 825-wrapping wall; 83-bristles; 84-roller brush shaft. DETAILED DESCRIPTION

[0034] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0035] It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0036] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship 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 device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0038] The pool cleaning robot can move on the bottom and side walls of the pool, and remove dirt in the pool by filtering, brushing, etc. It can replace manpower to clean the pool, and has a high cleaning efficiency. It can also reach every corner of the pool, including some areas that are difficult to clean manually.

[0039] Tracked pool cleaning robots use a pulley drive mechanism to propel the tracks, allowing the robot to reach the cleaning area. However, these pulleys are typically mounted directly on the robot's main housing, requiring high precision assembly. This results in uneven rotation and high resistance, which in turn causes the motor to draw high current and easily overheat and damage, directly impacting the robot's lifespan and user experience.

[0040] In order to solve the above technical problems, the utility model proposes a pulley fixing structure and a swimming pool cleaning robot. The pulley fixing structure includes a main shell 10, a synchronous pulley 20 and a rotating bearing 30. By providing a first circumferential portion 11 on the main shell 10, a second circumferential portion 22 on the synchronous pulley 20, and providing the rotating bearing 30 between the first circumferential portion 11 and the second circumferential portion 22, after the synchronous pulley 20 is installed on the main shell 10, the rotation of the synchronous pulley 20 is smoother, the assembly accuracy requirement is not high, and the rotation resistance is small, the motor current is small, the operation is stable, and it is durable.

[0041] The pulley fixing structure provided in an embodiment of the present invention will now be described. The pulley fixing mechanism is used in a pulley transmission mechanism, which can output linear motion. A pulley transmission mechanism generally includes a drive element, a synchronous pulley 20, and a synchronous belt 70. The drive element rotates one synchronous pulley 20, which in turn drives the synchronous belt 70, which in turn drives the other synchronous pulley 20. When the pulley transmission mechanism is used in a pool cleaning robot, the synchronous belt 70 can be a track, which drives the entire pool cleaning robot through the pulley transmission mechanism.

[0042] See also Figures 1 to 3 The pulley fixing structure includes a main housing 10, a synchronous pulley 20, and a rotating bearing 30. The main housing 10 has a first circumferential portion 11. The synchronous pulley 20 is used to cooperate with the synchronous belt 70 for transmission. The synchronous pulley 20 includes a pulley disc 21 and a second circumferential portion 22 axially extending from the pulley disc 21. The first circumferential portion 11 and the second circumferential portion 22 are coaxially arranged, and the rotating bearing 30 is fixed between the first circumferential portion 11 and the second circumferential portion 22. The axial direction can be understood as a direction parallel to the central axis of the synchronous pulley 20, the circumferential direction can be understood as a direction around the central axis of the synchronous pulley 20, and the radial direction can be understood as a direction perpendicular to the axial direction and passing through the central axis of the synchronous pulley 20.

[0043] The main housing 10 is the primary mounting structure for the pulley transmission mechanism. When the pulley mounting structure is used in a pool cleaning robot, the main housing 10 can serve as the base of the pool cleaning robot. The main housing 10 has a first circumferential portion 11, which can be formed by extending axially from the surface of the main housing 10. The first circumferential portion 11 is annular.

[0044] The synchronous pulley 20 is generally used in conjunction with the synchronous belt 70. Meshing teeth are provided on the outer periphery of the synchronous pulley 20 and the inner wall of the synchronous belt 70, enabling meshing transmission between the synchronous pulley 20 and the synchronous belt 70. In the embodiment provided by the present utility model, the synchronous pulley 20 can be a driving pulley directly driven by a driving wheel, or a driven pulley directly driven by the synchronous belt 70. The synchronous pulley 20 includes a pulley disc 21 and a second circumferential portion 22, which is disposed in the middle of the pulley disc 21 and has an annular structure.

[0045] The rotating bearing 30 can be a ball bearing, which is fixed between the first circumferential portion 11 and the second circumferential portion 22, so that the second circumferential portion 22 can rotate more smoothly relative to the first circumferential portion 11, thereby making the synchronous pulley 20 rotate more smoothly relative to the main housing 10.

[0046] The pulley fixing structure in the above embodiment includes a main housing 10, a synchronous pulley 20 and a rotating bearing 30. The synchronous pulley 20 includes a pulley disc 21 and a second circumferential portion 22. The main housing 10 has a first circumferential portion 11. The rotating bearing 30 is arranged between the first circumferential portion 11 and the second circumferential portion 22, so that the rotation of the synchronous pulley 20 relative to the main housing 10 is smoother, with less resistance, low motor current, stable operation, and durability, which directly increases the service life of the swimming pool robot and improves the user experience.

[0047] In some embodiments of the present invention, please refer to Figure 3 and Figure 4 The second circumferential portion 22 is arranged on the outer periphery of the first circumferential portion 11, the rotating bearing 30 includes an inner ring and an outer ring, and there is a ball between the inner ring and the outer ring. The inner circumferential wall of the second circumferential portion 22 is fixedly connected to the outer ring of the rotating bearing 30, and the outer circumferential wall of the first circumferential portion 11 is fixedly connected to the inner ring of the rotating bearing 30.

[0048] In some embodiments of the present invention, the first circumferential portion 11 is arranged on the outer periphery of the second circumferential portion 22, the rotating bearing 30 includes an inner ring and an outer ring, and there is a ball between the inner ring and the outer ring. The inner circumferential wall of the first circumferential portion 11 is fixedly connected to the outer ring of the rotating bearing 30, and the outer circumferential wall of the second circumferential portion 22 is fixedly connected to the inner ring of the rotating bearing 30.

[0049] In some embodiments of the present invention, please refer to Figures 2 to 4 The pulley fixing structure also includes a limiting pressure piece 40 and a locking piece 61. The second circumferential portion 22 is arranged on the outer periphery of the first circumferential portion 11. The outer circumferential wall of the first circumferential portion 11 has a step structure 13. The inner wall of the second circumferential portion 22 extends radially inward to form a limiting portion 23. The locking piece 61 passes through the pressure piece and is locked to the first circumferential portion 11, so that the rotating bearing 30 and the limiting portion 23 are axially pressed at the step structure 13.

[0050] The limiting pressure piece 40 and the locking member 61 cooperate to axially fix the first circumferential portion 11, the second circumferential portion 22, and the rotating bearing 30. Specifically, the limiting portion 23 and the rotating bearing 30 on the second circumferential portion 22 are axially arranged on the outer periphery of the first circumferential portion 11. One end of the bearing assembly formed by the limiting portion 23 and the rotating bearing 30 is limited by the step structure 13, and the other end of the bearing assembly is pressed and limited by the limiting pressure piece 40 and locked to the first circumferential portion 11 through the locking member 61. The second circumferential portion 22 and the first circumferential portion 11 are spaced apart, and the axial limitation of the second circumferential portion 22 is achieved by providing the limiting portion 23 on the second circumferential portion 22.

[0051] By setting the limiting pressure piece 40 and the locking piece 61, the first circumferential portion 11, the second circumferential portion 22 and the rotating bearing 30 can be axially limited and locked to prevent the second circumferential portion 22 and the rotating bearing 30 from axially moving relative to the first circumferential portion 11.

[0052] In some embodiments, the locking member 61 is a screw. A first connecting hole 41 is defined in the position-limiting pressure piece 40, and a second connecting hole 12 is defined at one axial end of the first circumferential portion 11. The screw passes through the first connecting hole 41 and connects with the second connecting hole 12, thereby pressing and securing the position-limiting pressure piece 40 to one end of the first circumferential portion 11. The outer diameter of the position-limiting pressure piece 40 is larger than the outer diameter of the first circumferential portion 11, thereby blocking the end of the bearing assembly.

[0053] In some embodiments, there are multiple locking members 61 , and the multiple locking members 61 are circumferentially arranged on the limiting pressing piece 40 in sequence.

[0054] In some embodiments, the limiting pressure piece 40 is in the shape of a circular ring, with a hollowed-out center to avoid interference with structures such as the roller brush shaft 84 and allow the roller brush shaft 84 to pass through.

[0055] In some embodiments, the limiting pressure piece 40 is provided with a circumferential positioning hole 42, and the main housing 10 is provided with a circumferential positioning protrusion. When the limiting pressure piece 40 is installed on the main housing 10, the circumferential positioning hole 42 and the circumferential positioning protrusion cooperate to circumferentially position the limiting pressure piece 40 to prevent misalignment during installation. The circumferential positioning hole 42 can be in the shape of a circular hole, an arc hole, etc.

[0056] In some embodiments of the present invention, please refer to Figures 2 to 4 There are two rotating bearings 30, the step structure 13, one rotating bearing 30, the limiting portion 23, the other rotating bearing 30, and the limiting pressure plate 40 are arranged in sequence along the axial direction, the limiting portion 23 extends to abut against the outer ring of the rotating bearing 30, and the limiting portion 23 is spaced apart from the first circumferential portion 11.

[0057] The inner ring of the first rotating bearing 30 is abutted axially by the step structure 13 and the stopper 23, respectively. The outer ring of the second rotating bearing 30 is abutted axially by the stopper 23 and the stopper pressure plate 40, respectively. The stopper 23 separates the two rotating bearings 30, making their layout more rational. The spacing of the stopper 23 from the first circumferential portion 11 ensures smoother rotation of the first circumferential portion 11 relative to the second circumferential portion 22, preventing interference between the two.

[0058] By providing two rotating bearings 30 , at least two supporting positions can be provided between the first circumferential portion 11 and the second circumferential portion 22 , thereby making the rotation of the second circumferential portion 22 relative to the first circumferential portion 11 more stable and the rotation of the synchronous pulley 20 smoother.

[0059] In some embodiments of the present invention, there is one rotating bearing 30, and the step structure 13, the rotating bearing 30, the limiting portion 23, and the limiting pressure piece 40 are sequentially arranged along the axial direction. The limiting portion 23 extends to abut against the inner ring of the rotating bearing 30, and the limiting portion 23 is spaced apart from the first circumferential portion 11. In other embodiments, the number of rotating bearings 30 may also be three, four, etc.

[0060] In some embodiments of the present invention, please refer to Figures 3 to 5 The limiting portion 23 includes a first limiting section 231 and a second limiting section 232 connected to each other, the axial width of the first limiting section 231 is smaller than the axial width of the second limiting section 232, and one end of the first limiting section 231 abuts against the outer ring of one of the rotating bearings 30.

[0061] One end of the first limiting section 231 is connected to the second circumferential portion 22, and the other end of the first limiting section 23 is connected to the second limiting section 232. In other words, the second limiting section 232 is closer to the first circumferential portion 11 than the first limiting section 231. After the synchronous pulley 20 and the rotating bearing 30 are installed, the second limiting section 232 is located between the inner races of the two rotating bearings 30, filling the gap between the two rotating bearings 30. The axial width of the first limiting section 231 refers to the dimension of the first limiting section 231 in the axial direction, while the axial width of the second limiting section 232 refers to the dimension of the second limiting section 232 in the axial direction.

[0062] By providing the first limiting section 231 and the second limiting section 232 with different axial widths and making the limiting portion 23 only abut against the outer ring of the rotating bearing 30, the normal rotation of the rotating bearing 30 is ensured and the limiting portion 23 is easier to install.

[0063] In some embodiments of the present invention, the limiting portion 23 includes a first limiting section 231 and a second limiting section 232 connected to each other, the axial width of the first limiting section 231 is greater than the axial width of the second limiting section 232, and the two ends of the first limiting section 231 respectively abut against the outer rings of the two rotating bearings 30.

[0064] In some embodiments of the present invention, please refer to Figures 2 to 4 The pulley fixing structure also includes a fixed bracket 50 and a roller brush assembly 80. The fixed bracket 50 includes a fixed plate 51 and a fixed shaft 52 that are connected to each other. The fixed plate 51 is fixedly connected to the pulley disc 21, and the fixed shaft 52 is arranged through the first circumferential portion 11; the fixed shaft 52 is a hollow structure, and the roller brush rotating shaft 84 of the roller brush assembly 80 is arranged through the fixed shaft 52.

[0065] The fixed bracket 50 is a connecting structure that securely connects the synchronous pulley 20 and the roller brush assembly 80. As the synchronous pulley 20 rotates, the roller brush assembly 80 also moves synchronously through the connection of the fixed bracket 50. The roller brush assembly 80 is used to clean the pool without contact. A roller brush shaft 84 is protruded from at least one end of the roller brush assembly 80. The fixed shaft 52 can be understood as an axial extension of the fixed plate 51. The fixed shaft 52 is hollow, giving it a cylindrical structure.

[0066] By setting the fixed bracket 50, the synchronous pulley 20 and the roller brush assembly 80 move synchronously. In this way, the roller brush assembly 80 rolls at the same time as the pool cleaning robot moves. There is no need to set up an additional roller brush drive mechanism, which reduces the power system of the pool cleaning robot, reduces the number of parts of the pool cleaning robot, and is relatively simple to assemble.

[0067] In some embodiments, the fixing plate 51 and the pulley disc 21 are fixedly connected by a fixing member 62. Specifically, the fixing member 62 passes through the fixing plate 51 and is connected to the pulley disc 21. When the fixing member 62 is a threaded member, a third connecting hole 510 is formed on the fixing plate 51, and a fourth connecting hole 210 is formed on the pulley disc 21. The threaded member passes through the third connecting hole 510 and is connected to the fourth connecting hole 210, thereby fixing the fixing plate 51 to the pulley disc 21, and further fixing the fixing bracket 50 and the synchronous pulley 20 to each other.

[0068] Optionally, there are multiple fixing members 62 , which are arranged at circumferential intervals, so that the fixed connection structure between the fixing plate 51 and the pulley 21 is more stable.

[0069] Optionally, the circumference of the fixing member 62 has an annular boss 511, so that the head of the fixing member 62 is recessed into the annular boss 511. This can protect the head of the fixing member 62, and when a decorative cover is set on the surface of the fixing bracket 50, the decorative cover will not interfere with the head of the fixing member 62, thereby facilitating the installation of the decorative cover.

[0070] In some embodiments, the first circumferential portion 11 is a hollow structure, the fixed shaft 52 is disposed through the first circumferential portion 11, and the roller brush shaft 84 is disposed through the fixed shaft 52. More intuitively, the roller brush shaft 84, the fixed shaft 52, the first circumferential portion 11, and the second circumferential portion 22 are disposed sequentially from the inside to the outside.

[0071] In some embodiments of the present invention, please refer to Figures 3 to 6 The roller brush assembly 80 includes a roller brush shaft 84 and a roller brush body 81 mounted on the roller brush shaft 84. A transmission hole 820 is provided at one end of the roller brush body 81. One end of the fixed shaft 52 has a transmission portion 521 for extending into the transmission hole 820. The transmission portion 521 and the transmission hole 820 cooperate with each other to enable the fixed shaft 52 and the roller brush body 81 to rotate synchronously.

[0072] The roller brush body 81 has a central axis hole defined along its central axis. The roller brush shaft 84 extends through this hole, with the central axis of the roller brush shaft 84 coinciding with the central axis of the roller brush body 81. A transmission hole 820 is defined at one end of the roller brush body 81. This "end" refers to the axial end of the roller brush body 81. The transmission hole 820 matches the cross-sectional shape of the transmission portion 521, ensuring that the roller brush body 81 rotates synchronously with the fixed bracket 50.

[0073] A transmission hole 820 is provided at one end of the roller brush body 81, and a transmission part 521 is provided at one end of the fixed shaft 52. The rotation of the fixed bracket 50 is transmitted to the roller brush body 81 through the mutual cooperation between the transmission hole 820 and the transmission part 521, and the rotation of the roller brush body 81 is achieved without the need for other fixed structures.

[0074] In some embodiments, the cross-sections of the transmission hole 820 and the transmission portion 521 are both hexagonal, so that the rotation of the fixed bracket 50 drives the roller brush assembly 80 to move, and the bristles 83 of the roller brush assembly 80 rub against the wall of the swimming pool to clean dirt.

[0075] In some embodiments, the cross-sections of the transmission hole 820 and the transmission portion 521 are both D-shaped, so that the rotation of the fixed bracket 50 drives the roller brush assembly 80 to move, and the bristles 83 of the roller brush assembly 80 rub against the wall of the swimming pool to clean dirt.

[0076] It can be understood that when the cross-sections of the transmission hole 820 and the transmission part 521 are both non-circular, the rotation of the transmission part 521 will drive the components to which the transmission hole 820 belongs to rotate.

[0077] In some embodiments, the roller brush shaft 84 and the roller brush body 81 are fixed to each other, and the roller brush shaft 84 and the roller brush body 81 rotate synchronously, reducing the friction between the roller brush shaft 84 and the roller brush body 81 and reducing the friction between the roller brush shaft 84 and the fixed bracket 50.

[0078] In some embodiments, the roller brush shaft 84 can rotate relative to the roller brush body 81, and the roller brush shaft 84 is more flexible and does not have the risk of getting stuck.

[0079] In other embodiments, the roller brush assembly 80 includes a roller brush shaft 84 and a roller brush body 81 sleeved on the roller brush shaft 84. A transmission hole 820 is defined at one end of the roller brush shaft 84. A transmission portion 521 is defined at one end of the fixed shaft 52 for extending into the transmission hole 820. The transmission portion 521 and the transmission hole 820 cooperate to synchronize the fixed shaft 52 and the roller brush body 81. Alternatively, the rotating end of the roller brush may have the transmission portion 521, while the fixed end may have the transmission hole 820 into which the transmission portion 521 extends. The transmission portion 521 and the transmission hole 820 cooperate to synchronize the fixed shaft 52 and the roller brush body 81.

[0080] In some embodiments of the present invention, please refer to Figure 3 and Figure 4 The roller brush body 81 includes a roller brush bracket 82 and bristles 83 fixed to the outer peripheral wall of the roller brush bracket 82. The roller brush bracket 82 includes a roller brush cylinder 821 and a roller brush end wall 822 connected to one end of the roller brush cylinder 821. The roller brush end wall 822 is recessed to form a transmission hole 820, and the roller brush end wall 822 is provided with a shaft hole at the bottom of the transmission hole 820, and extends axially from the shaft hole to form a wrapping wall 825, and the wrapping wall 825 is for the roller brush shaft 84 to pass through.

[0081] The roller brush holder 82 is the main support structure of the roller brush body 81, allowing the bristles 83 to be distributed circumferentially along the circumferential wall of the roller brush holder 82. The bottom wall formed by the inward depression of the roller brush end wall 822 is called the stop wall 824. The circumferential wall formed by the inward depression of the roller brush end wall 822 is the hole wall 823. The hole enclosed by the hole wall 823 is the transmission hole 820 mentioned above. The bottom of the transmission hole 820 is the stop wall 824, and the shaft hole is provided in the stop wall 824.

[0082] The bottom of the transmission hole 820 stops the transmission portion 521, forming an axial limit for the fixed shaft 52 and the roller brush body 81. The wrapping wall 825 extending from the bottom of the transmission hole 820 radially limits the roller brush shaft 84, thereby making the connection between the roller brush shaft 84 and the roller brush bracket 82 more stable, reducing the shaking of the roller brush shaft 84, and improving the quality of the robot.

[0083] In some embodiments, the roller brush body 81 further includes a filtering structure, which can be disposed inside the roller brush bracket 82. When the roller brush body 81 rotates to clean the pool wall, the filtering structure can absorb dirt, achieving the purpose of cleaning and absorbing at the same time.

[0084] In some embodiments of the present invention, please refer to Figure 3 and Figure 4 The roller brush shaft 84 extends out of the fixed bracket 50, and a retaining spring 63 is secured to the protruding end of the roller brush shaft 84. One end of the fixed bracket 50, which includes the fixed shaft 52, is positioned proximate to the roller brush body 81. The roller brush shaft 84 extends into the fixed bracket 50 and outward from the fixed bracket 50, extending away from the roller brush body 81. The retaining spring 63 is engaged with the protruding end of the roller brush shaft 84, thereby securing the axial positions of the fixed bracket 50 and the roller brush shaft 84 relative to each other.

[0085] By providing the retaining spring 63 , the axial positions of the fixing bracket 50 and the roller brush shaft 84 can be positioned, thereby preventing the roller brush shaft 84 from moving inside the fixing bracket 50 .

[0086] In some embodiments, a slot is formed at the protruding end of the roller brush shaft 84, in which the retaining spring 63 is received. The retaining spring 63 may be provided in a plurality and distributed in sequence along the axial direction of the roller brush shaft 84. The plurality of retaining springs 63 may provide a greater axial restraining force.

[0087] In some embodiments, a gasket 64 is provided between the retaining spring 63 and the fixing bracket 50 . The provision of the gasket 64 can protect the surface of the fixing bracket 50 and prevent the surface from being crushed.

[0088] In other embodiments, one end of the roller brush shaft 84 extends out of the fixed bracket 50 , and one end of the roller brush shaft 84 is threadedly connected to a threaded member, which also has an axial limiting function.

[0089] In some embodiments of the present invention, please refer to Figure 4 and Figure 6 The fixing plate 51 extends toward the pulley disc 21 to form an annular positioning portion 512, and the annular positioning portion 512 extends into the interior of the second circumferential portion 22. When the fixing bracket 50 is mounted on the pulley disc 21, the annular positioning portion 512 is located inside the second circumferential portion 22.

[0090] By providing the annular positioning portion 512 , when the fixing bracket 50 is installed, the cooperation between the annular positioning portion 512 and the second circumferential portion 22 can radially position the fixing bracket 50 , thereby preventing the fixing bracket 50 from being misplaced during installation.

[0091] In some embodiments, the annular positioning portion 512 is a closed annular structure, or includes a plurality of structures that are spaced apart and formed into an annular shape.

[0092] The present invention also provides a swimming pool cleaning robot, which includes the wheel fixing structure of any of the above embodiments. The swimming pool cleaning robot is used to clean dirt from a swimming pool and is widely used in public swimming pools, private swimming pools, etc.

[0093] The swimming pool cleaning robot provided by the present invention adopts the above-mentioned pulley fixing structure, which includes a main housing 10, a synchronous pulley 20 and a rotating bearing 30. The synchronous pulley 20 includes a pulley disc 21 and a second circumferential portion 22. The main housing 10 has a first circumferential portion 11, and the rotating bearing 30 is arranged between the first circumferential portion 11 and the second circumferential portion 22, so that the rotation of the synchronous pulley 20 relative to the main housing 10 is smoother, with less resistance, low motor current, stable operation, and durability, which directly increases the service life of the swimming pool robot and improves user experience.

[0094] In some embodiments of the present invention, please refer to Figure 1 The two pulley fixing structures are fixedly connected to the main housing 10 of the two pulley fixing assemblies, or the main housing 10 of the two pulley fixing assemblies is integrally formed. Accordingly, there are two pulley transmission mechanisms, enabling the pool cleaning robot to move via two tracks (synchronous belts 70). Within the two pulley fixing assemblies, two roller brush assemblies 80 are coaxially arranged, and the ends of the two roller brush assemblies 80 that are closest to each other are fixed to each other.

[0095] In some embodiments, see Figure 1 In the two pulley fixing assemblies, the roller brush shafts 84 of the two roller brush assemblies 80 are coaxial and fixedly connected, and can be regarded as the same shaft. Limiting members are provided at both ends of the roller brush shaft 84. The limiting members are used to stop the fixing bracket 50 and axially position the fixing bracket 50 and the roller brush shaft 84. The limiting members can be the aforementioned retaining spring 63, a threaded member, etc.

[0096] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A pulley fixing structure for a pulley transmission mechanism, characterized in that: It includes a main housing, a synchronous pulley and a rotating bearing. The main housing has a first circumferential portion. The synchronous pulley is used to cooperate with the synchronous belt for transmission. The synchronous pulley includes a pulley disc and a second circumferential portion axially extended from the pulley disc. The first circumferential portion and the second circumferential portion are coaxially arranged, and the rotating bearing is fixed between the first circumferential portion and the second circumferential portion.

2. The pulley fixing structure according to claim 1, wherein: The pulley fixing structure also includes a limiting pressure plate and a locking piece. The second circumferential portion is arranged on the outer periphery of the first circumferential portion. The outer circumferential wall of the first circumferential portion has a step structure. The inner wall of the second circumferential portion extends radially inward to form a limiting portion. The locking piece passes through the pressure plate and is locked to the first circumferential portion, so that the rotating bearing and the limiting portion are axially pressed at the step structure.

3. The pulley fixing structure according to claim 2, wherein: There are two rotating bearings, and the step structure, one of the rotating bearings, the limiting portion, the other rotating bearing, and the limiting pressure plate are arranged in sequence along the axial direction. The limiting portion extends to abut against the outer ring of the rotating bearing, and the limiting portion is spaced apart from the first circumferential portion.

4. The pulley fixing structure according to claim 3, wherein: The limiting portion includes a first limiting section and a second limiting section connected to each other, the axial width of the first limiting section is smaller than the axial width of the second limiting section, and one end of the first limiting section abuts against the outer ring of one of the rotating bearings.

5. The pulley fixing structure according to claim 1, wherein: The pulley fixing structure also includes a fixed bracket and a roller brush assembly. The fixed bracket includes a fixed plate and a fixed shaft connected to each other. The fixed plate is fixedly connected to the pulley disc, and the fixed shaft is arranged through the first circumferential portion; the fixed shaft is a hollow structure, and the roller brush rotating shaft of the roller brush assembly is arranged through the fixed shaft.

6. The pulley fixing structure according to claim 5, wherein: The roller brush assembly includes a roller brush shaft and a roller brush body mounted on the roller brush shaft. A transmission hole is provided at one end of the roller brush body. One end of the fixed shaft has a transmission part for extending into the transmission hole. The transmission part and the transmission hole cooperate with each other to enable the fixed shaft and the roller brush body to rotate synchronously.

7. The pulley fixing structure according to claim 6, wherein: The roller brush body includes a roller brush bracket and bristles fixed to the outer peripheral wall of the roller brush bracket. The roller brush bracket includes a roller brush cylinder and a roller brush end wall connected to one end of the roller brush cylinder. The roller brush end wall is recessed to form the transmission hole, and the roller brush end wall is provided with a shaft hole at the bottom of the transmission hole, and extends axially from the shaft hole to form a wrapping wall, and the wrapping wall is for the roller brush shaft to pass through.

8. The pulley fixing structure according to claim 6, wherein: The roller brush shaft extends out of the fixing bracket, and a clip is fixed on the protruding end of the roller brush shaft.

9. The pulley fixing structure according to claim 6, wherein: The fixing plate extends toward the pulley disc to form an annular positioning portion, and the annular positioning portion extends into an interior of the second circumferential portion.

10. A swimming pool cleaning robot, characterized by: The invention comprises the pulley fixing structure according to any one of claims 1 to 9.

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