Surface treatment tool

Abstract

A surface treatment tool. The surface treatment tool comprises a housing, a driving assembly, a transmission system, and a working accessory; the driving assembly is arranged in the housing, the driving assembly comprises a motor, and a motor shaft of the motor can rotate about the motor axis; the transmission system comprises an input shaft and an output shaft, the input shaft can rotate about an input axis, and the output shaft can rotate about an output axis; the working accessory is connected to the output shaft; a first plane P1 is defined, the intersection of the first plane P1 and the input axis is a first intersection C1, the intersection of the first plane P1 and the output axis is a second intersection C2, a line connecting the first intersection C1 and the second intersection C2 is a transmission center line, the included angle between the projection line of the motor axis onto the first plane P1 and the transmission center line is a first included angle α, and the first included angle α is greater than or equal to 90 degrees and less than or equal to 170 degrees.

Description

Surface treatment tools

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on September 22, 2023, with application number 202311234435.8, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to an electric tool, for example, to a surface treatment tool. Background Art

[0003] In a surface treatment tool known in the related art, a motor drives a drawing wheel through a reduction mechanism, which then polishes the surface to be polished. The reduction mechanism typically includes a primary bevel gear transmission and a secondary pulley transmission, with the drawing wheel mounted on the output shaft of the pulley transmission. In wire drawing machines of the related art, the reduction mechanism is positioned in front of the motor, aligning the motor axis with the centerline of the belt. This essentially creates a straight front-to-back layout for the entire machine, resulting in a relatively small space underneath the machine and making it difficult to accommodate other components.

[0004] This section provides background information related to the present application which is not necessarily prior art.

[0005] Summary of the Invention

[0006] This application adopts the following technical solutions:

[0007] A surface treatment tool comprises: a housing; a drive assembly, arranged in the housing, the drive assembly comprising a motor, the motor shaft of the motor being rotatable with the motor axis; a transmission system, driven to rotate by the motor, the transmission system comprising an input shaft and an output shaft, the input shaft being rotatable with the input axis, the output shaft being rotatable with the output axis, the input shaft being connected to the motor shaft, and the output shaft being transmission-connected to the input shaft; a working accessory being connected to the output shaft, and the working accessory being rotatable around the output axis; defining a first plane P1, the first plane P1 being substantially perpendicular to the left-right direction of the surface treatment tool, the intersection of the first plane P1 and the input axis being a first intersection C1, the intersection of the first plane P1 and the output axis being a second intersection C2, the line formed by the first intersection C1 and the second intersection C2 being a transmission center line, the angle between the projection line of the motor axis onto the first plane P1 and the transmission center line being a first angle α, the first angle α being greater than or equal to 90 degrees and less than or equal to 170 degrees.

[0008] In some embodiments, the first angle α is greater than or equal to 120 degrees and less than or equal to 160 degrees.

[0009] In some embodiments, along the extension direction of the input shaft, the distance between the motor axis and the transmission center line is a first distance L, and the first distance L is greater than or equal to 4 cm and less than or equal to 10 cm.

[0010] In some embodiments, a dust suction port is provided at the lower portion of the housing, and dust generated by the surface treatment tool is discharged into the dust collection device through the dust suction port, and the dust suction port is located between the motor axis and the transmission center line.

[0011] In some embodiments, a dust suction pipe is provided at the dust suction port, and in the vertical direction, the dust suction pipe at least partially overlaps with the casing.

[0012] In some embodiments, the dust suction port is located below the motor.

[0013] In some embodiments, the transmission system further includes a first housing and a belt transmission mechanism disposed in the first housing. The belt transmission mechanism transmits and connects the input shaft and the output shaft. Both the input shaft and the output shaft pass through the first housing.

[0014] In some embodiments, the belt drive mechanism is located in front of the motor and offset to the left or right of the motor axis.

[0015] In some embodiments, the belt transmission mechanism includes a driving pulley, a driven pulley, and a belt wound around the driving pulley and the driven pulley. The driving pulley is disposed on the input shaft, and the driven pulley is disposed on the output shaft.

[0016] In some embodiments, a shaft locking structure is provided on the first housing, and the shaft locking structure can lock the driven pulley.

[0017] In some embodiments, the transmission system further includes a second housing and a bevel gear transmission mechanism disposed in the second housing. The input shaft passes through the second housing, and the bevel gear transmission mechanism transmission-connects the motor shaft and the input shaft.

[0018] In some embodiments, the bevel gear transmission mechanism includes a first bevel gear and a second bevel gear, the first bevel gear is disposed on the motor shaft, the second bevel gear is disposed on the input shaft, and the first bevel gear is meshed with the second bevel gear.

[0019] In some embodiments, the transmission system also includes a connecting shell, the second shell is located between the connecting shell and the first shell, the second shell and the casing are detachably connected via a first locking member, and the first shell, the second shell and the connecting shell are detachably connected via a second locking member.

[0020] In some embodiments, it also includes: a battery pack, a mounting portion is formed or connected to the casing, the battery pack is detachably arranged on the mounting portion, and a second angle β is formed between the plug-in and pull-out direction of the battery pack and the motor axis, and the second angle β is greater than or equal to 0 degrees and less than or equal to 90 degrees.

[0021] In some embodiments, the second angle β is equal to 90 degrees, and the plugging and unplugging direction of the battery pack is parallel or perpendicular to the central axis of the output shaft.

[0022] In some embodiments, the second angle β is greater than or equal to 10 degrees and less than or equal to 80 degrees.

[0023] In some embodiments, it also includes: a power cord, a connecting portion is formed on the housing, and the power cord is connected to the connecting portion.

[0024] In some embodiments, an auxiliary handle is provided on the housing, and the auxiliary handle has a receiving cavity for accommodating a wrench.

[0025] In some embodiments, the wrench can be inserted into the accommodating cavity along a second straight line, where the second straight line is perpendicular to the motor axis.

[0026] In some embodiments, the wrench is magnetically connected to the auxiliary handle.

[0027] In some embodiments, the input axis is substantially parallel to the output axis.

[0028] In some embodiments, at least one of the input axis and the output axis is substantially perpendicular to the motor axis.

[0029] In some embodiments, a grip portion is formed on the housing, and an angle formed by the motor axis and an extension direction of the grip portion is greater than 0 and less than 90 degrees.

[0030] In some embodiments, the working accessory is connected to the output shaft via a flat key. A groove for fitting the flat key is provided on the working accessory, and the flat key and the output shaft can be attracted to each other magnetically. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] FIG1 is a structural schematic diagram of a surface treatment tool provided by the present application;

[0032] FIG2 is a second structural diagram of a surface treatment tool provided by the present application;

[0033] FIG3 is a third structural diagram of a surface treatment tool provided by the present application;

[0034] FIG4 is a partial structural exploded schematic diagram of a surface treatment tool provided by the present application;

[0035] FIG5 is a second schematic diagram of a partial structural decomposition of a surface treatment tool provided by the present application;

[0036] FIG6 is a schematic diagram of a shaft lock structure provided by the present application;

[0037] FIG7 is a partial structural diagram of a surface treatment tool provided by the present application;

[0038] FIG8 is a schematic diagram of a partial structure of a surface treatment tool provided by the present application showing a first plane;

[0039] FIG9 is a front view of a surface treatment tool provided by the present application showing a partial structure of a first plane;

[0040] FIG10 is a top view of a partial structure of a surface treatment tool provided by the present application;

[0041] FIG11 is a front view of a partial structure of a surface treatment tool provided by the present application;

[0042] FIG12 is a top view of a partial structure of another surface treatment tool provided by the present application;

[0043] FIG13 is a schematic diagram of the axis of another surface treatment tool provided by the present application;

[0044] FIG14 is a front view of a surface treatment tool provided by the present application;

[0045] FIG15 is a schematic diagram of the exploded structure of a surface treatment tool provided by the present application;

[0046] FIG16 is a front view of a partial structure of another surface treatment tool provided by the present application;

[0047] FIG17 is a front view of a partial structure of another surface treatment tool provided by the present application;

[0048] FIG18 is a second schematic diagram of the exploded structure of a surface treatment tool provided by the present application;

[0049] FIG19 is a schematic diagram of the exploded view of the output shaft and the flat key provided in this application. DETAILED DESCRIPTION

[0050] Before any embodiments of the present application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the foregoing drawings.

[0051] In this application, the terms "comprises," "includes," "has," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0052] In this application, the term "and / or" describes a relationship between related objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Additionally, the character " / " in this application generally indicates that the related objects are in an "and / or" relationship.

[0053] In this application, the terms "connect," "combine," "couple," and "install" may refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, a direct connection refers to two parts or components being connected together without an intermediary, and an indirect connection refers to two parts or components being connected to at least one intermediary, with the two parts or components being connected via the intermediary. Furthermore, "connect" and "couple" are not limited to physical or mechanical connections or couplings and may include electrical connections or couplings.

[0054] In this application, it will be understood by those skilled in the art that relative terms (e.g., "about," "approximately," "substantially," etc.) used in conjunction with quantities or conditions include the values ​​and have the meaning indicated by the context. For example, the relative terms include at least the degree of error associated with the measurement of a specific value, the tolerance caused by manufacturing, assembly, use, etc. associated with a specific value. Such terms should also be considered to disclose a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to plus or minus a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​that do not use relative terms should also be disclosed as specific values ​​with tolerances. In addition, "substantially" may refer to plus or minus a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) on the basis of the indicated angle when expressing a relative angular position relationship (e.g., substantially parallel, substantially perpendicular).

[0055] In this application, it will be understood by those skilled in the art that the function performed by an assembly can be performed by one assembly, multiple assemblies, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one assembly, or a combination of multiple parts.

[0056] In the present application, the terms "upper", "lower", "left", "right", "front", "back" and other directional words are described based on the orientation and positional relationship shown in the accompanying drawings, and should not be understood as limiting the embodiments of the present application. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to the other element "upper" or "lower", but also be indirectly connected to the other element "upper" or "lower" through an intermediate element. It should also be understood that directional words such as upper side, lower side, left side, right side, front side, back side, etc. not only represent the positive orientation, but can also be understood as the lateral orientation. For example, below can include directly below, lower left, lower right, lower front and lower back, etc.

[0057] As shown in Figures 1 to 4, the present application provides a surface treatment tool 100, which can be a grinding machine, a polishing machine, a wire drawing machine, etc. The surface treatment tool 100 includes a housing 10, a drive assembly 20, a transmission system 30, and a working accessory 40. The drive assembly 20 is disposed within the housing 10 and includes a motor 21 having a motor shaft 211, the central axis of which is the motor axis 212. The transmission system 30 is driven to rotate by the motor 21. The transmission system 30 includes an input shaft 31 and an output shaft 32. The input shaft 31 can rotate with the input axis 311, and the output shaft 32 can rotate with the output axis 321. The input shaft 31 is connected to the motor shaft 211, and the output shaft 32 is in transmission connection with the input shaft 31. The working accessory 40 is connected to the output shaft 32 and can rotate about the output axis 321. The motor shaft 211 drives the input shaft 31 to rotate, which in turn drives the output shaft 32 to rotate, thereby driving the working accessory 40 to rotate.

[0058] The surface treatment tool 100 also includes an energy source for providing energy to the surface treatment tool 100. The energy source can be AC ​​power or DC power, such as a portable power source such as a battery pack 50. In some embodiments, the surface treatment tool 100 includes the battery pack 50. A mounting portion is formed on or connected to the housing 10, and the battery pack 50 is detachably mounted on the mounting portion. In some embodiments, the surface treatment tool 100 includes a power cord. A connecting portion is formed on the housing 10, and the power cord is connected to the connecting portion.

[0059] The housing 10 extends generally in a front-to-back direction. The work attachment 40 is located at the front of the housing 10, and the power source is located at the rear end of the housing 10. A grip 101 is formed on the housing 10 to facilitate operation of the surface treatment tool 100. The grip 101 is located at the rear of the housing 10. The grip 101 extends in the front-to-back direction, with the left and right sides of the grip 101 being the left-to-right direction.

[0060] The surface treatment tool 100 also includes a trigger 22, which is arranged at the front end of the grip 101 and located on the lower side of the housing 10. The trigger 22 is used to control the start and stop of the motor 21. The setting position of the trigger 22 is convenient for start and stop operations when gripping.

[0061] The housing 10 is provided with an auxiliary handle 60 having a receiving cavity 601 for accommodating a wrench 80. The provision of the receiving cavity 601 on the auxiliary handle 60 fully utilizes the space for accommodating the wrench 80 or other accessories. In some embodiments, the auxiliary handle 60 is U-shaped, positioned on the front side of the housing 10 and extending upward. The auxiliary handle 60 is tilted in the front-to-back direction, conforming to an ergonomic design. It is non-slip and comfortable, providing a firm grip and effortless handling, enhancing the user experience even during long hours of work.

[0062] In some embodiments, the output shaft 32 and the input shaft 31 may be connected by a gear transmission mechanism. In this embodiment, as shown in Figures 4 and 5, the transmission system 30 further includes a first housing 33 and a belt transmission mechanism 34 disposed within the first housing 33. The belt transmission mechanism 34 transmits power to and connects the input shaft 31 and the output shaft 32, both of which pass through the first housing 33. The use of the belt transmission mechanism 34 effectively ensures the stability of the working accessory 40 during use, reduces the frequency of vibration of the working accessory 40 and the surface treatment tool 100 as a whole, and reduces noise generation, thereby enhancing the user experience.

[0063] The belt transmission mechanism 34 includes a driving pulley 341 , a driven pulley 342 , and a belt 343 wound around the driving pulley 341 and the driven pulley 342 . The driving pulley 341 is disposed on the input shaft 31 , and the driven pulley 342 is disposed on the output shaft 32 .

[0064] The first housing 33 is provided with a shaft locking structure 70, which can lock the driven pulley 342. Locking the driven pulley 342 locks the output shaft 32, which can prevent the belt 343 from being broken due to excessive force when installing or removing the working accessory 40.

[0065] As shown in Figures 5 and 6, the shaft lock structure 70 includes a limiting rod 71 and a spring (not shown). The limiting rod 71 is elastically connected to the first housing 33 via the spring. The limiting rod 71 can move between a locked position and an unlocked position. A plurality of limiting holes 3421 are provided around the axis of the driven pulley 342. When the limiting rod 71 is in the locked position, the limiting rod 71 is inserted into the limiting hole 3421. When the limiting rod 71 is in the unlocked position, the limiting rod 71 is disengaged from the limiting hole 3421. When the operator presses one end of the limiting rod 71, the limiting rod 71 can be driven to move from the unlocked position to the locked position. When the operator releases the limiting rod 71, the spring resets under its own elastic action, driving the limiting rod 71 to move from the locked position to the unlocked position.

[0066] Specifically, a button 72 is provided at one end of the limiting rod 71 for easy pressing by the operator. A limiting protrusion 73 is circumferentially arranged on the limiting rod 71. A stepped hole 331 is provided in the first housing 33. The limiting rod 71 is inserted into the stepped hole 331. The limiting protrusion 73 serves to limit the limiting rod 71, preventing it from falling out of the stepped hole 331. A spring is sleeved on the limiting rod 71, with one end of the spring abutting the button 72 and the other end abutting the stepped surface of the stepped hole 331.

[0067] As shown in FIG4 and FIG7 , the transmission system 30 further includes a second housing 35 and a bevel gear transmission mechanism 36 disposed in the second housing 35 . The input shaft 31 passes through the second housing 35 . The bevel gear transmission mechanism 36 transmits and connects the motor shaft 211 and the input shaft 31 .

[0068] The bevel gear transmission mechanism 36 includes a first bevel gear 361 and a second bevel gear 362 . The first bevel gear 361 is disposed on the motor shaft 211 , and the second bevel gear 362 is disposed on the input shaft 31 . The first bevel gear 361 is meshed with the second bevel gear 362 .

[0069] The transmission system 30 also includes a connecting shell 37, the second shell 35 is located between the connecting shell 37 and the first shell 33, the second shell 35 and the casing 10 are detachably connected via a first locking member, and the first shell 33, the second shell 35 and the connecting shell 37 are detachably connected via a second locking member 38.

[0070] During installation, the motor shaft 211 and the first bevel gear 361 are first inserted into the second housing 35, and the second housing 35 and the housing 10 are connected via the first locking member. The input shaft 31 is then inserted into the second housing 35, so that the first bevel gear 361 and the second bevel gear 362 are meshed. At this point, the first housing 33 abuts one side of the second housing 35. The connecting housing 37 is then abutted against the other side of the second housing 35, and the first housing 33, the second housing 35, and the connecting housing 37 are connected via the second locking member 38. The first locking member and the second locking member 38 may be bolts.

[0071] As shown in Figures 8 and 9, a first plane P1 is defined. The first plane P1 is substantially perpendicular to the left-right direction of the surface treatment tool 100. The intersection of the first plane P1 and the input axis 311 is the first intersection C1. The intersection of the first plane P1 and the output axis 321 is the second intersection C2. The line formed by the first intersection C1 and the second intersection C2 is the transmission centerline 301. The angle between the projection line of the motor axis 212 onto the first plane P1 and the transmission centerline 301 is the first angle α. The first angle α is greater than or equal to 90 degrees and less than or equal to 170 degrees. The entire machine is no longer arranged in a straight line. The space between the transmission centerline 301 and the motor axis 212 facilitates the arrangement of other components. When the motor axis 212 is located on the first plane P1, the first angle α is the angle between the transmission centerline 301 and the motor axis 212. When the motor axis 212 intersects or is substantially parallel to the first plane P1 , the first angle α is the angle between the projection line of the motor axis 212 onto the first plane P1 and the transmission center line 301 .

[0072] In some embodiments, the first angle α is greater than or equal to 120 degrees and less than or equal to 160 degrees. In some embodiments, the first angle α is equal to 130 degrees, 140 degrees, 150 degrees, or 155 degrees.

[0073] In some embodiments, the angle formed by the motor axis 212 and the extension direction of the grip portion 101 is greater than 0 and less than 90 degrees, which is convenient for gripping. In some embodiments, the grip portion 101 extends substantially along the first straight line 105, and the first straight line 105 is within the first plane P1.

[0074] When the housing is divided into two detachable parts, the two parts interlock with each other, forming an assembly line 104. In some embodiments, the assembly line 104 is located within the first plane P1. In some embodiments, the assembly line 104 is located outside the first plane P1, and the motor 21 is offset within the housing 10.

[0075] As shown in Figures 10 and 11 , in one embodiment, the input axis 311 is substantially parallel to the output axis 321 , facilitating the arrangement of the transmission mechanism. The input axis 311 is substantially perpendicular to the motor axis 212 , and the output axis 321 is substantially perpendicular to the motor axis 212 .

[0076] When using a belt drive mechanism 34, a belt 343 is wound around a driving pulley 341 and a driven pulley 342, extending substantially along a belt extension line 3431. Along the extension direction of the input shaft 31, the distance between the motor axis 212 and the belt extension line 3431 is a first distance L. This first distance L is greater than or equal to 4 cm and less than or equal to 10 cm to ensure overall machine balance. In some embodiments, the first distance L is greater than or equal to 5 cm and less than or equal to 8 cm.

[0077] The belt drive mechanism 34 is located in front of the motor 21 and is offset to the left or right of the motor axis 212. In this embodiment, the belt drive mechanism 34 is offset to the right of the motor axis 212. Typically, the operator holds the housing 10 with their right hand, and the belt drive mechanism 34 is offset to the right of the motor axis 212, placing the working accessory 40 on the output shaft 32 close to the operator for easy observation.

[0078] In some embodiments, at least one of the input axis 311 and the output axis 321 is substantially perpendicular to the motor axis 212. In one embodiment, the input axis 311 is substantially perpendicular to the motor axis 212, and the input axis 311 and the output axis 321 are arranged at an angle. In another embodiment, as shown in FIG12 , the output axis 321 is substantially perpendicular to the motor axis 212, and the input axis 311 and the output axis 321 are arranged at an angle.

[0079] In some embodiments, as shown in FIG. 13 , the input axis 311 and the output axis 321 are arranged at an angle, and both the input axis 311 and the output axis 321 are not perpendicular to the motor axis 212 .

[0080] As shown in Figures 8 and 14, a dust suction port 102 is provided at the bottom of the housing 10. The dust generated by the surface treatment tool 100 is discharged into the dust collection device through the dust suction port 102. The dust suction port 102 is located between the motor axis 212 and the transmission center line 301. The space between the motor axis 212 and the transmission center line 301 is fully utilized to optimize the overall layout of the machine. In the related art, the dust suction port 102 is positioned too high, and the dust needs to be lifted up before being sucked away, resulting in low dust collection efficiency. The dust suction port 102 of the present application is positioned too low, and the dust is directly sucked away, resulting in high dust collection efficiency.

[0081] Specifically, a protective cover 41 is provided on the periphery of the working attachment 40, and a dust suction port 102 is provided on the protective cover 41. The protective cover 41 is connected to the housing of the transmission system 30. In some embodiments, the dust suction port 102 is located below the motor 21. In some embodiments, the dust suction port 102 is located below the motor axis 212. In some embodiments, the dust suction port 102 is located below the auxiliary handle 60. In some embodiments, the dust suction port 102 is located below the belt 343.

[0082] A dust collection tube 103 is located at the dust collection port 102. A certain amount of space is provided between the motor axis 212 and the transmission centerline 301 to prevent the dust collection tube 103 from obstructing tool movement. Vertically, the dust collection tube 103 at least partially overlaps the housing 10. In some embodiments, the dust collection tube 103 extends parallel to the motor axis 212, positioning it completely behind the work attachment 40 to avoid obstructing tool movement.

[0083] The dust suction pipe 103 is detachable for easy maintenance and can be specifically connected by a thread. The dust suction port 102 can also be connected to a vacuum cleaner.

[0084] The dust suction pipe 103 is arranged in a stepped structure, that is, the inner diameter of the dust suction pipe 103 becomes smaller and smaller from the end connected to the protective cover 41 to the direction away from the protective cover 41, which effectively improves the dust removal efficiency.

[0085] As shown in Figures 15 to 17, a second angle β is formed between the plug-in and unplug-out direction A1 of the battery pack 50 and the motor axis 212. The second angle β is greater than or equal to 0 degrees and less than or equal to 90 degrees. In some embodiments, the second angle β is equal to 90 degrees, and the plug-in and unplug-out direction A1 of the battery pack 50 is perpendicular to the motor axis 212. At this time, the plug-in and unplug-out direction A1 of the battery pack 50 is parallel or perpendicular to the output axis 321. In some embodiments, the second angle β is greater than or equal to 10 degrees and less than or equal to 80 degrees. In some embodiments, the second angle β is greater than or equal to 30 degrees and less than or equal to 60 degrees.

[0086] The wrench 80 can be inserted into the accommodating cavity 601 along the second straight line B1, which is perpendicular to the motor axis 212. In other words, the wrench 80 is inserted into the accommodating cavity 601 substantially in the left-right direction. The opening of the accommodating cavity 601 is located on the left or right side of the auxiliary handle 60, without affecting the grip on the top of the auxiliary handle 60. The wrench 80 can be used to remove the working accessory 40. There are many types of working accessories 40, and they can be replaced as needed.

[0087] In some embodiments, the wrench 80 is magnetically connected to the auxiliary handle 60. In some embodiments, the wrench 80 is snap-fitted to the auxiliary handle 60.

[0088] As shown in Figures 18 and 19, the working accessory 40 is connected to the output shaft 32 via two flat keys 39. Only when the flat keys 39 are correctly installed in the grooves 322 of the output shaft 32 can the mounting opening 44 of the working accessory 40 be mounted on the output shaft 32. The provision of two flat keys 39 improves the transmission efficiency and stability between the working accessory 40 and the output shaft 32. A washer 42 and a locking member 43 are provided at the end of the output shaft 32 to limit the working accessory 40. The locking member 43 can be installed and removed using a wrench 80.

[0089] The flat keys in the related art are mostly in the shape of a cuboid, and their cross-section is generally a rectangle, but the long side and the wide side of the rectangle are not much different, so it is not easy to distinguish. During installation, they are often installed upside down, and it is discovered that they do not fit when the working accessories 40 are installed, and they need to be reinstalled, affecting the assembly efficiency.

[0090] As shown in Figure 19, the flat key 39 provided in the present application has an arc-shaped portion 391 formed at at least one end of the flat key 39, so that the flat key 39 has a first surface 392 and a second surface 393 of different shapes. The first surface 392 is basically rectangular, and the end of the second surface 393 has an arc, so it is easy to distinguish during assembly, thereby improving assembly efficiency.

[0091] In some embodiments, the flat key 39 is magnetic and can be attracted to the output shaft 32 , thereby preventing the flat key 39 from falling off during installation of the working accessory 40 .

[0092] The above shows and describes the basic principles, main features and advantages of this application. Those skilled in the art should understand that the above embodiments do not limit this application in any form, and any technical solutions obtained by equivalent replacement or equivalent transformation fall within the scope of protection of this application.

Claims

1. A surface treatment tool, comprising: chassis; A drive assembly is disposed in the housing, wherein the drive assembly comprises a motor, and a motor shaft of the motor can rotate along with the motor axis; A transmission system, driven to rotate by the motor, the transmission system comprising an input shaft and an output shaft, the input shaft can rotate along with the input axis, the output shaft can rotate along with the output axis, the input shaft is connected to the motor shaft, and the output shaft is in driving connection with the input shaft; A working accessory connected to the output shaft, the working accessory being rotatable around the output axis; A first plane P1 is defined, wherein the first plane P1 is substantially perpendicular to the left-right direction of the surface treatment tool, the intersection of the first plane P1 and the input axis is a first intersection C1, the intersection of the first plane P1 and the output axis is a second intersection C2, the line formed by the first intersection C1 and the second intersection C2 is a transmission center line, the angle between the projection line of the motor axis onto the first plane P1 and the transmission center line is a first angle α, and the first angle α is greater than or equal to 90 degrees and less than or equal to 170 degrees.

2. The surface treatment tool according to claim 1, wherein: The first angle α is greater than or equal to 120 degrees and less than or equal to 160 degrees.

3. The surface treatment tool according to claim 1, wherein: Along the extension direction of the input shaft, the distance between the motor axis and the transmission center line is a first distance L, and the first distance L is greater than or equal to 4 cm and less than or equal to 10 cm.

4. The surface treatment tool according to claim 1, wherein: The lower part of the housing is provided with a dust suction port, and dust generated by the surface treatment tool is discharged into the dust collecting device through the dust suction port, and the dust suction port is located between the motor axis and the transmission center line.

5. The surface treatment tool according to claim 4, wherein: A dust suction pipe is arranged at the dust suction port, and in the vertical direction, the dust suction pipe at least partially overlaps with the housing.

6. The surface treatment tool according to claim 4, wherein: The dust suction port is located below the motor.

7. The surface treatment tool according to claim 1, wherein: The transmission system further includes a first housing and a belt transmission mechanism disposed in the first housing. The belt transmission mechanism is transmission-connected between the input shaft and the output shaft. Both the input shaft and the output shaft are disposed through the first housing.

8. The surface treatment tool according to claim 7, wherein: The belt transmission mechanism is located in front of the motor and biased to the left or right side of the motor axis.

9. The surface treatment tool according to claim 7, wherein: The belt transmission mechanism comprises a driving pulley, a driven pulley and a belt wound around the driving pulley and the driven pulley. The driving pulley is arranged on the input shaft, and the driven pulley is arranged on the output shaft.

10. The surface treatment tool according to claim 9, wherein: The first housing is provided with a shaft locking structure, and the shaft locking structure can lock the driven pulley.

11. The surface treatment tool according to claim 7, wherein: The transmission system further includes a second housing and a bevel gear transmission mechanism disposed in the second housing. The input shaft passes through the second housing. The bevel gear transmission mechanism is transmission-connected between the motor shaft and the input shaft.

12. The surface treatment tool according to claim 11, wherein: The bevel gear transmission mechanism includes a first bevel gear and a second bevel gear, the first bevel gear is arranged on the motor shaft, the second bevel gear is arranged on the input shaft, and the first bevel gear is meshed with the second bevel gear.

13. The surface treatment tool according to claim 11, wherein: The transmission system also includes a connecting shell, the second shell is located between the connecting shell and the first shell, the second shell and the casing are detachably connected via a first locking member, and the first shell, the second shell and the connecting shell are detachably connected via a second locking member.

14. The surface treatment tool according to claim 1, further comprising: A battery pack, a mounting portion is formed or connected on the housing, the battery pack is detachably arranged on the mounting portion, a second angle β is formed between the plugging and unplugging direction of the battery pack and the motor axis, and the second angle β is greater than or equal to 0 degrees and less than or equal to 90 degrees.

15. The surface treatment tool according to claim 14, wherein: The second angle β is equal to 90 degrees, and the plugging and unplugging direction of the battery pack is parallel or perpendicular to the central axis of the output shaft.

16. The surface treatment tool according to claim 14, wherein: The second angle β is greater than or equal to 10 degrees and less than or equal to 80 degrees.

17. The surface treatment tool according to claim 1, further comprising: A power cord is formed on the housing with a connecting portion, and the power cord is connected to the connecting portion.

18. The surface treatment tool according to claim 1, wherein: The housing is provided with an auxiliary handle, the auxiliary handle has a receiving cavity, and the receiving cavity is configured to receive a wrench.

19. The surface treatment tool according to claim 18, wherein: The wrench can be inserted into the accommodating cavity along a second straight line direction, and the second straight line is perpendicular to the motor axis.

20. The surface treatment tool according to claim 18, wherein: The wrench is magnetically connected to the auxiliary handle.

21. The surface treatment tool according to claim 1, wherein: The input axis is substantially parallel to the output axis.

22. The surface treatment tool according to claim 1, wherein: At least one of the input axis and the output axis is substantially perpendicular to the motor axis.

23. The surface treatment tool according to claim 1, wherein: A gripping portion is formed on the housing, and an angle formed by the motor axis and an extending direction of the gripping portion is greater than 0 and less than 90 degrees.

24. The surface treatment tool according to claim 1, wherein: The working accessory is connected to the output shaft via a flat key. A groove for matching the flat key is provided on the working accessory. The flat key and the output shaft can be attracted to each other magnetically.

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