Electric motor assembly, and floor scrubber

Abstract

Provided in the present application are an electric motor assembly and a floor scrubber. The electric motor assembly comprises: a casing, which has a first through hole; an electric motor shaft, which is mounted in the casing, one end of the electric motor shaft extending to the outside of the casing from the first through hole; a sealing ring, which is mounted outside the casing and has a second through hole, the end of the electric motor shaft extending to the outside of the casing passing through the sealing ring through the second through hole, and the sealing ring being in sealing contact with the electric motor shaft and the casing to seal the first through hole. In this structure, the sealing ring is arranged outside of the casing, which ensures the sealing effect. In addition, when the sealing ring is not mounted properly or needs to be repaired or replaced, the sealing ring can be directly replaced or adjusted outside of the casing without disassembling the casing, that is, without disassembling the electric motor part, which can avoid a bearing loss of the electric motor part caused by replacement of the sealing ring, and can also avoid the replacement of the entire electric motor part due to damage of the sealing ring.

Description

Motor assembly and floor scrubber

[0001] The applicant declares that this application claims priority to the Chinese patent application submitted to the China Patent Office on November 16, 2023, with application number "202323101099.8" and invention name "Motor assembly and floor scrubber", all of which are incorporated into this application by introduction. Technical Field

[0002] The present application relates to the field of motors, and in particular, to a motor assembly and a floor scrubber. Background Art

[0003] As living standards improve, household cleaning appliances are becoming increasingly popular. Household floor scrubbers address the pain point of conventional vacuum cleaners, combining vacuuming and floor scrubbing functions to make floor cleaning easier. To meet these water-absorbing requirements, the motor, a core component of a floor scrubber, must possess excellent waterproof properties. Furthermore, to achieve enhanced cleaning performance, the motor must deliver greater flow and vacuum levels, which necessitates greater motor power.

[0004] Existing wet / dry motors in floor scrubbers mostly use grease seals. Grease seals are convenient and have minimal impact on motor efficiency. However, as motor power increases, speed increases, and vacuum levels increase, the grease is more likely to react with moisture, aging and deteriorating, losing its sealing effectiveness.

[0005] Existing motor solutions that use sealing rings place the ring inside the motor casing, between the bearing and the casing. This makes it difficult to observe and adjust the seal's position during installation. If the seal is misaligned or improperly installed, the entire motor must be disassembled for repair and replacement, which can damage the bearing and cause bearing wear. Furthermore, the seal ring rubs against the shaft during operation and is a consumable part. Installed inside the casing, it cannot be replaced. If the seal ring fails, the entire motor must be replaced, increasing maintenance costs.

[0006] Therefore, how to solve the waterproof problem of high-power wet and dry dual-purpose motors has become an urgent problem to be solved.

[0007] Application Contents

[0008] This application aims to solve at least one of the technical problems existing in the prior art or related art.

[0009] Therefore, one object of the present application is to provide a motor assembly.

[0010] Another object of the present application is to provide a floor scrubber.

[0011] To achieve the above-mentioned objectives, the technical solution of the first aspect of the present application provides a motor assembly, including: a casing, a first through hole being provided on the casing; a motor shaft being installed in the casing, and one end of the motor shaft extending from the first through hole to the outside of the casing; a sealing ring being installed outside the casing, a second through hole being provided on the sealing ring, and the end of the motor shaft extending outside the casing passes through the sealing ring through the second through hole, and the sealing ring is in sealing contact with the motor shaft and the casing to seal the first through hole.

[0012] The motor assembly provided by the technical solution of the present application includes a housing, a motor shaft, and a sealing ring. The housing is the outer shell of the motor part, which is used to accommodate parts such as the stator assembly and the rotor assembly. The housing is provided with a first through hole, and the motor shaft is installed in the housing. One end of the motor shaft can extend from the first through hole to the outside of the housing to drive parts such as the impeller outside the housing to rotate. The sealing ring is located outside the housing and installed at the first through hole. After passing through the housing, the motor shaft passes through the second through hole of the sealing ring, thereby allowing the sealing ring to be arranged around the circumference of the motor shaft. At the same time, the inner side of the sealing ring is sealed to the motor shaft, and the bottom of the sealing ring is also sealed to the housing. In this way, the sealing ring, the motor shaft, and the housing form a sealed space, thereby achieving a seal on the first through hole, thereby achieving a seal at the intersection of the motor shaft and the housing, thereby preventing water and other liquids outside the housing from entering the interior of the housing through the first through hole. This structure ensures a good sealing effect because the sealing ring is arranged outside the housing. At the same time, when the sealing ring is not installed properly or needs to be repaired or replaced, it can be replaced or adjusted directly outside the casing without disassembling the casing, that is, without disassembling the motor part. This can avoid bearing loss of the motor part caused by replacement of the sealing ring, and also avoid the need to replace the entire motor part due to damage to the sealing ring.

[0013] The technical solution of the second aspect of the present application provides a floor scrubber, comprising: a motor assembly provided by any technical solution of the first aspect.

[0014] The floor scrubber provided according to the technical solution of the present application includes the above-mentioned motor assembly, and therefore has all the beneficial effects of the motor assembly provided by any of the technical solutions of the first aspect, which will not be repeated here.

[0015] Additional aspects and advantages of the present application will become apparent in the following description or may be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0017] FIG1 is a schematic structural diagram of a motor assembly provided by an embodiment of the present application;

[0018] FIG2 is a schematic diagram of a partially exploded structure of a motor assembly provided by an embodiment of the present application;

[0019] FIG3 is an enlarged schematic diagram of point A in FIG1 ;

[0020] FIG4 is a schematic structural diagram of a sealing ring of a motor assembly provided in one embodiment of the present application;

[0021] FIG5 is another schematic structural diagram of a sealing ring of a motor assembly provided by an embodiment of the present application;

[0022] FIG6 is a schematic structural diagram of a stator impeller of a motor assembly provided in one embodiment of the present application;

[0023] FIG7 is another structural schematic diagram of the stator impeller of the motor assembly provided by one embodiment of the present application;

[0024] FIG8 is a schematic diagram of a partial structure of a motor assembly provided in another embodiment of the present application.

[0025] Among them, the correspondence between the figure marks in Figures 1 to 8 and the component names is: 1 casing, 12 first through hole, 14 mounting groove, 16 protruding structure, 2 motor shaft, 3 sealing ring, 30 first part, 32 second part, 34 second through hole, 342 first hole portion, 344 second hole portion, 36 first supporting portion, 38 second supporting portion, 39 positioning groove, 4 stator, 42 protrusion, 44 third through hole, 46 limiting groove, 5 grease structure, 6 impeller, 7 wind cover, 82 rotor assembly, 84 stator assembly, 86 bracket, 88 rear cover plate, 89 drive plate. DETAILED DESCRIPTION

[0026] In order to more clearly understand the above-mentioned objects, features and advantages of the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features therein can be combined with each other in the absence of conflict.

[0027] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.

[0028] The motor assembly and the floor scrubber proposed in the embodiments of the present application are described below with reference to FIG. 1 to FIG. 8 .

[0029] As shown in Figures 1 to 3, an embodiment of the first aspect of the present application provides a motor assembly, which includes a housing 1, a motor shaft 2 and a sealing ring 3.

[0030] 2 and 3 , the housing 1 is provided with a first through hole 12 . The motor shaft 2 is mounted in the housing 1 , and one end of the motor shaft 2 extends out of the housing 1 through the first through hole 12 .

[0031] As shown in Figures 2 and 3, the sealing ring 3 is installed on the outside of the casing 1. A second through hole 34 is provided on the sealing ring 3. The end of the motor shaft 2 extending outside the casing 1 passes through the sealing ring 3 through the second through hole 34. The sealing ring 3 is in sealing contact with the motor shaft 2 and the casing 1 to seal the first through hole 12.

[0032] According to the embodiment of the present application, the motor assembly provided includes a casing 1, a motor shaft 2 and a sealing ring 3. The casing 1 is the outer shell of the motor part, which is used to accommodate parts such as the stator assembly 84 and the rotor assembly 82. A first through hole 12 is provided on the casing 1, and the motor shaft 2 is installed in the casing 1, and one end of the motor shaft 2 can extend from the first through hole 12 to the outside of the casing 1, so as to drive the impeller 6 and other parts outside the casing 1 to rotate. The sealing ring 3 is located outside the casing 1 and is installed at the first through hole 12. After the motor shaft 2 passes through the casing 1, it passes through the sealing ring 3 through the second through hole 34 of the sealing ring 3, so that the sealing ring 3 is arranged around the circumference of the motor shaft 2. At the same time, the inner side of the sealing ring 3 is sealed to the motor shaft 2, and the bottom of the sealing ring 3 is also sealed to the housing 1, so that the sealing ring 3, the motor shaft 2 and the housing 1 form a sealed space, thereby achieving the sealing of the first through hole 12, thereby achieving the sealing of the intersection of the motor shaft 2 and the housing 1, thereby preventing water or other liquids outside the housing 1 from entering the interior of the housing 1 through the first through hole 12. This structure ensures the sealing effect because the sealing ring 3 is arranged outside the housing 1. At the same time, when the sealing ring 3 is not installed in place or needs to be repaired or replaced, it can be directly replaced or adjusted outside the housing 1 without disassembling the housing 1, that is, without disassembling the motor part. This can avoid the bearing loss of the motor part caused by the replacement of the sealing ring 3, and can also avoid the situation where the entire motor part needs to be replaced due to damage to the sealing ring 3.

[0033] In some embodiments, as shown in FIG. 2 and FIG. 3 , a mounting groove 14 is provided on the housing 1 , the sealing ring 3 is at least partially installed in the mounting groove 14 , and the first through hole 12 passes through the bottom wall of the mounting groove 14 .

[0034] In this embodiment, the housing 1 is provided with a mounting groove 14, and the first through-hole 12 is disposed on the bottom wall of the mounting groove 14. The mounting groove 14 is used to position and install the sealing ring 3. The provision of the mounting groove 14 allows the sealing ring 3 to be fixed in position, thereby quickly determining the installation position of the sealing ring 3, improving the installation efficiency of the sealing ring 3, and reducing the probability of the sealing ring 3 being installed crookedly or improperly.

[0035] In some embodiments, as shown in Figures 2 and 3, the motor assembly further includes a stator impeller 4. The stator impeller 4 is mounted outside the casing 1, on a side of the sealing ring 3 away from the casing 1. The stator impeller 4 presses the sealing ring 3 toward the casing 1.

[0036] In this embodiment, the motor assembly also includes a stator impeller 4. The main function of the stator impeller 4 is to release the air generated by the impeller 6 more smoothly, that is, the main function of the stator impeller 4 is to guide the air. At the same time, part of the stator impeller 4 presses the sealing ring 3 from the upper side of the sealing ring 3, so that the sealing ring 3 can be clamped by the stator impeller 4 and the casing 1, thereby achieving a seal between the sealing ring 3 and the casing 1. This arrangement, while setting the sealing ring 3 outside the casing 1, uses the stator impeller 4 to achieve the positioning and installation of the sealing ring 3 outside the casing 1, so that there is no need to set an additional positioning structure for the sealing ring 3, thereby simplifying the structure of the product and reducing the cost of product improvement.

[0037] In another embodiment (not shown in the figure), a positioning plate, a positioning cover and other structures can be additionally fixed to the housing 1 by means of bolts, snaps and the like to achieve compression and fixation of the sealing ring 3 .

[0038] In some embodiments, as shown in Figures 3 and 4, a third through hole 44 is provided on the stator impeller 4. The sealing ring 3 includes a first portion 30 and a second portion 32 whose outer walls are connected in a stepped manner. The first portion 30 is supported and mounted on the casing 1.

[0039] In this embodiment, the sealing ring 3 comprises upper and lower ends, namely a first portion 30 and a second portion 32. The first portion 30 is supported and mounted on the casing 1 and clamped between the stator 4 and both ends of the casing 1. This ensures a tight seal on the end faces of the sealing ring 3 through the stator 4.

[0040] In some embodiments, the stator impeller 4 is mounted on the first portion 30 with the side facing the housing 1, i.e., the inner side of the stator impeller 4, thereby achieving end-face compression of the sealing ring through the stator impeller 4. Furthermore, the second portion 32 is located within the third through-hole 44. The inner sidewall of the third through-hole 44 of the stator impeller 4 compresses the second portion 32 along the axis perpendicular to the motor shaft 2. In other words, the second portion 32 and the third through-hole 44 are loosely fitted.

[0041] In this embodiment, the second portion 32 of the sealing ring 3 is located within the third through hole 44 of the stator impeller 4, and the second portion 32 of the sealing ring 3 and the third through hole 44 are tightly fitted. This allows the stator impeller 4 to compress the second portion 32 of the sealing ring 3, ensuring sealed contact between the second portion 32 of the sealing ring 3 and the motor shaft 2. This structure allows the stator impeller 4 to compress the sealing ring 3 not only from a portion of its end surface but also from the side surfaces, thereby ensuring the installation stability of the sealing ring 3.

[0042] Furthermore, as shown in Figures 2 and 3, when the housing 1 is provided with a mounting groove 14, the first portion 30 of the sealing ring 3 is located in the mounting groove 14, and the second portion 32 of the sealing ring 3 extends out from the notch of the mounting groove 14. The stator impeller 4 is pressed against the first portion 30 of the sealing ring 3.

[0043] Furthermore, as shown in Figure 6, a positioning groove 39 is formed on the outer side wall of the first part 30 and the second part 32 of the sealing ring 3. The positioning groove 39 is an L-shaped groove or an L-shaped groove-like groove. The inner end support of the stator impeller 4 is installed in the L-shaped groove or the L-shaped groove-like groove, so that the stator impeller 4 can not only press the sealing ring 3 from part of the end face of the sealing ring 3, but also press the sealing ring 3 from the side of the sealing ring 3, thereby ensuring the installation stability of the sealing ring 3.

[0044] Furthermore, the inner side of the stator impeller 4 is bent toward the casing 1 to form a protrusion 42 , and the protrusion 42 is tightly mounted on the first portion 30 of the sealing ring 3 .

[0045] Furthermore, the inner side of the stator impeller 4 extends to above the mounting groove 14 and forms a mounting space with the mounting groove 14 . The first portion 30 of the sealing ring 3 is pressed and mounted in the mounting space by the inner side of the stator impeller 4 .

[0046] In some embodiments, as shown in Figures 4 and 5, the second through hole 34 includes a first hole portion 342 arranged close to the housing 1 and a second hole portion 344 arranged away from the housing 1, and the inner diameter of the first hole portion 342 is larger than the inner diameter of the second hole portion 344.

[0047] In this embodiment, a second through hole 34 is provided in the middle of the sealing ring 3, which passes through the sealing ring 3. The second through hole 34 is used to allow the motor shaft 2 to pass through, so that the sealing ring 3 is arranged around the motor shaft 2. The apertures of the upper and lower parts of the second through hole 34 are inconsistent. The upper hole is smaller and is the second hole portion 344, while the lower hole is larger and is the first hole portion 342. This stepped hole arrangement ensures that the lower part of the sealing ring 3 is relatively wide, thereby increasing the overlapping area between the sealing ring 3 and the housing 1, thereby improving the installation stability of the sealing ring 3. The relatively narrow upper part of the sealing ring 3 enables the sealing ring 3 to better seal with the motor shaft 2, thereby achieving sealing of the first through hole 12.

[0048] In some embodiments, as shown in FIG4 , a first support portion 36 extending toward the center of the second through hole 34 is provided at the connection between the first hole portion 342 and the second hole portion 344 . The first support portion 36 is sealed against the motor shaft 2 to achieve sealing of the motor shaft 2 .

[0049] In this embodiment, the first support portion 36 protrudes from the inner wall of the first through hole 12, allowing for closer contact with the motor shaft 2, thereby ensuring a seal between the sealing ring 3 and the motor shaft 2. At the same time, this arrangement also allows for loose contact between other locations and the motor shaft 2, making it easier to fill grease or the like between the motor shaft 2 and the sealing ring 3 to achieve an oil seal.

[0050] In some embodiments, as shown in FIG3 , one or more third support portions extending toward the center of the second through hole 34 are provided on the inner side wall of the second through hole 34 , and at least one third support portion is sealingly fitted with the motor shaft 2 to achieve sealing of the motor shaft 2 .

[0051] In this embodiment, the third support portion is designed to protrude from the inner wall of the first through hole 12, so that it can be in closer contact with the motor shaft 2, thereby ensuring the sealing effect between the sealing ring 3 and the motor shaft 2. At the same time, this arrangement can also make other positions not in close contact with the motor shaft 2, thereby facilitating the filling of grease and the like between the motor shaft 2 and the sealing ring 3 to achieve an oil seal. Furthermore, the number of third support portions can be one or more, and the actual number can be set according to actual needs. Among them, the third support portion can be arranged at the connection between the first hole portion 342 and the second hole portion 344, or it can be arranged at other positions, that is, the second support portion 38 is one of the third support portions.

[0052] In some embodiments, as shown in Figures 3 to 5, a second support portion 38 is provided on the end of the sealing ring 3 away from the housing 1, and the second support portion 38 is sealed and fitted around the motor shaft 2, wherein the inner diameter of the second support portion 38 gradually decreases from the end close to the housing 1 to the end away from the housing 1.

[0053] In this embodiment, a second support portion 38 is provided on the end surface of the sealing ring 3 facing away from the housing 1, that is, on the top of the sealing ring 3. The second support portion 38 is configured to contact the motor shaft 2 to seal the motor shaft 2. The inner sidewall of the second support portion 38 gradually tapers inward along the axial direction of the sealing ring 3, from the side closest to the housing 1 to the side further away from the housing 1. In other words, the inner diameter of the second support portion 38 gradually decreases from the end closest to the housing 1 to the end further away from the housing 1. Simply put, the second support portion 38 is an inverted trumpet-shaped structure. This arrangement allows the second support portion 38 to form a seal with the motor shaft 2, ensuring a secure seal between the sealing ring 3 and the motor shaft 2.

[0054] Furthermore, as shown in FIG. 4 , the end of the second supporting portion 38 away from the sealing ring 3 is pointed, which can enhance the sealing effect between the sealing ring 3 and the motor shaft 2 .

[0055] Optimally, the sealing ring 3 is provided with not only the second supporting portion 38 but also the first supporting portion 36 , thereby further ensuring the sealing effect of the sealing ring 3 through multiple structures.

[0056] In the above embodiment, as shown in FIG8 , the motor assembly further includes a grease structure 5 . The grease structure 5 fills the space enclosed by the sealing ring 3 , the motor shaft 2 , and the housing 1 . The grease structure 5 further provides a seal. Thus, the dual effects of the sealing ring 3 and the grease provide a double seal for the first through-hole 12 , thereby ensuring a good sealing effect.

[0057] In some embodiments, as shown in FIG2 , the stator impeller 4 is fixed to the casing 1 by bolts or screws. This fixing method is relatively simple, easy to operate, and has a simple structure.

[0058] In another embodiment, the stator impeller 4 is fixed to the casing 1 by a snap-fit ​​structure, and the boss on the stator impeller 4 is used to press the lip of the skeleton shaft seal or other sealing ring 3, thereby fixing the skeleton shaft seal or other sealing ring 3.

[0059] Furthermore, the sealing ring 3 includes a skeleton oil seal, and the skeleton oil seal can form an oil seal, which has a better sealing effect than the ordinary sealing ring 3.

[0060] Furthermore, as shown in Figures 3, 6, and 7, a limiting groove 46 is provided on the side of the stator impeller 4 near the housing 1. The housing 1 is provided with a protruding structure 16, which is fixedly mounted within the limiting groove 46. The limiting groove 46 and the protruding structure 16 enable the fixed installation between the stator impeller 4 and the housing 1. The mounting groove 14 is located on the protruding structure 16, and the third through hole 44 passes through the limiting groove 46.

[0061] In some embodiments, the motor includes a wet / dry dual-purpose motor, such as a motor for a floor scrubber. Of course, the motor can also be used on other products that require wet / dry dual-purpose use.

[0062] An embodiment of the second aspect of the present application provides a floor scrubber (not shown in the figure), comprising: a motor assembly provided by any embodiment of the first aspect.

[0063] The floor scrubber provided according to the embodiment of the present application includes the motor assembly of any one of the embodiments of the first aspect, and therefore has all the beneficial effects of the motor assembly of any one of the embodiments of the first aspect, which will not be described in detail here.

[0064] Furthermore, as shown in Figures 1, 2 and 3, the motor includes a motor part and a fan part, and the motor shaft 2 belongs to the motor part and is used to drive the fan part to rotate. The motor part mainly includes a casing 1, a stator assembly 84, a rotor assembly 82 and a motor shaft 2. Furthermore, the motor also includes a bracket 86, a rear cover plate 88 and a drive plate 89. The fan part includes a stator impeller 4, a movable impeller 6 and a wind hood 7. The rotation of the movable impeller 6 can form a negative pressure to complete the air suction, and the function of the stator impeller 4 is to conduct the wind sucked in by the movable impeller 6 so that the wind can be released more smoothly. In this structure, since the sealing ring 3 is arranged on the outside of the casing 1, when the sealing ring 3 (generally a skeleton shaft seal) needs to be repaired or replaced, it is only necessary to remove the wind hood 7, the movable impeller 6 and the stator impeller 4 in turn without disassembling the motor part.

[0065] In this specification, the terms "connect," "install," and "fix" should be understood broadly. For example, "connect" can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a direct connection or an indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0066] Throughout this specification, terms such as "one embodiment," "some embodiments," and "specific embodiments" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0067] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A motor assembly, wherein: include: A casing, wherein a first through hole is provided on the casing; A motor shaft is installed in the housing, and one end of the motor shaft extends out of the housing from the first through hole; A sealing ring is installed outside the casing, and a second through hole is provided on the sealing ring. One end of the motor shaft extending outside the casing passes through the sealing ring through the second through hole. The sealing ring is in sealing contact with the motor shaft and the casing to seal the first through hole.

2. The motor assembly according to claim 1, wherein: The housing is provided with a mounting groove, the sealing ring is at least partially mounted in the mounting groove, and the first through hole passes through the bottom wall of the mounting groove.

3. The motor assembly according to claim 1, wherein: Also includes: The fixed impeller is installed outside the casing and is located at a side of the sealing ring away from the casing. The fixed impeller presses the sealing ring toward the casing.

4. The motor assembly according to claim 3, wherein: The sealing ring includes a first part and a second part whose outer side walls are connected in a stepped manner. The first part is supported and installed on the casing. A third through hole is provided on the stator impeller. The stator impeller is installed outside the second part through the third through hole, and the stator impeller is pressed and installed on the first part toward one side of the casing.

5. The motor assembly according to claim 4, wherein: The inner side wall of the third through hole of the stator wheel presses the second portion along an axial direction perpendicular to the motor shaft.

6. The motor assembly according to claim 1, wherein: The second through hole includes a first hole portion disposed close to the housing and a second hole portion disposed away from the housing, and an inner diameter of the first hole portion is greater than an inner diameter of the second hole portion.

7. The motor assembly according to claim 6, wherein: A first support portion extending toward the center direction of the second through hole is provided at the connection between the first hole portion and the second hole portion, and the first support portion is sealingly fitted with the motor shaft.

8. The motor assembly according to any one of claims 1 to 7, wherein: The sealing ring is provided with a second supporting portion on one end away from the housing. The second support portion is sealed around the motor shaft, wherein the inner diameter of the second support portion gradually decreases from an end close to the housing to an end away from the housing; At least one third supporting portion extending toward the center direction of the second through hole is provided on the inner side wall of the second through hole, and at least one of the third supporting portions is sealingly fitted with the motor shaft.

9. The motor assembly according to any one of claims 1 to 7, wherein: Also includes: The grease structure is filled in the space surrounded by the sealing ring, the motor shaft and the housing.

10. A floor scrubber, wherein: include: A motor assembly as claimed in any one of claims 1 to 9.

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