Motor assembly and planing handle

Abstract

The utility model provides a motor assembly and a planing handle, and relates to the technical field of minimally invasive surgery equipment. Comprising a motor, an output pipe and a sealing ring, the motor comprises a shell assembly and a rotor rotatably arranged in the shell assembly, an inner pipe which is coaxial with the rotor and rotates along with the rotor is arranged in the rotor, the rear end of the inner pipe penetrates out of the shell assembly, and a rotating gap is formed between the outer wall of the rear end of the inner pipe and the shell assembly in the radial direction of the rotor. The front end of the output pipe is connected to the shell assembly and directly communicated with the rear end of the inner pipe, and a connecting gap is formed between the inner pipe and the output pipe. The sealing ring is arranged on the inner pipe in a penetrating mode and blocks the rotating gap and the connecting gap at the same time. According to the utility model, liquid and tissues in the inner tube can be discharged into the output tube and discharged from the output tube. And the sealing ring blocks the rotating gap and the connecting gap, so that liquid and tissues in the inner pipe are prevented from leaking from the joint of the inner pipe and the output pipe and entering the motor, and the reliability of the product is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of minimally invasive surgical devices, in particular to a motor assembly and a powered surgical device with a shaver handle. Background Art

[0002] The shaver handle and a matching shaver blade are assembled into a powered surgical device capable of shaving tissue and sucking out the tissue.

[0003] In the existing shaver handle, the suction channel is arranged beside the axis of the motor for driving the cutter, and the suction channel or the axis of the motor is coaxial with the cutter mounting channel; when the cutter mounting channel in the handle is coaxial with the motor, the suction channel is offset from the cutter mounting channel; when the suction channel in the handle is coaxial with the cutter mounting channel, the axis of the motor is offset from the cutter mounting channel. These two types of shaver handles may result in a larger handle size and a more complex structure.

[0004] If a motor with a hollow channel integrated inside is adopted and the internal channel of the motor is used as the suction channel, the handle size can be reduced, but when this method is used, since the motor rotates, the problem of how to discharge the fluid and tissue in the internal channel of the motor out of the handle without leakage must be solved. Summary of the Utility Model

[0005] In view of the above-mentioned disadvantages of the prior art, the purpose of the present utility model is to provide a motor assembly and a shaver handle to solve the problem of reliable discharge of fluid and tissue when the internal channel of the motor is used as the suction channel.

[0006] To achieve the above object and other related objects, the present utility model provides a motor assembly, including:

[0007] A motor, the motor includes a housing assembly and an inner tube rotatably arranged inside the housing assembly, the rear end of the inner tube extends out of the housing assembly, and there is a rotational gap between the outer wall of the rear end of the inner tube and the housing assembly;

[0008] An output tube, the front end of the output tube is connected to the housing assembly and is inserted and communicated with the rear end of the inner tube, and there is a connection gap between the inner tube and the output tube;

[0009] A sealing ring, the sealing ring is sleeved on the inner tube and simultaneously seals the rotational gap and the connection gap.

[0010] Optionally, the front end of the output tube has an insertion section, the rear end of the inner tube is inserted into the insertion section and rotates inside the insertion section, and the connection gap includes the gap between the outer wall of the inner tube and the inner wall of the insertion section;

[0011] On the end face of the shell assembly near one end of the output pipe, a mounting hole is provided along the axis direction of the rotor of the motor. The rear end of the inner pipe is inserted into the mounting hole, and at least a part of the front end of the output pipe is arranged in the mounting hole. The inner wall of the insertion section, the hole wall of the mounting hole, and the outer wall of the inner pipe enclose a sealing cavity. The sealing cavity is respectively communicated with the rotating gap and the connecting gap. The sealing ring is arranged in the sealing cavity, and the sealing ring is in sealing contact with the insertion section, the hole wall of the mounting hole, and the outer wall of the inner pipe respectively.

[0012] Optionally, an internal thread is provided on the inner wall of the mounting hole, and an external thread is provided on the outer wall of the front end of the output pipe. The front end of the output pipe is threadedly connected to the mounting hole.

[0013] Optionally, the sealing cavity includes a main sealing cavity and a secondary sealing cavity arranged in sequence from inside to outside along the radial direction. The sealing ring includes a first sealing portion and a second sealing portion. The second sealing portion is located in the secondary sealing cavity and is pressed between the bottom of the mounting hole and the end face of the insertion section. The first sealing portion is arranged in the main sealing cavity. The first sealing portion is arranged along the radial direction between the second sealing portion and the outer wall of the inner pipe, and the first sealing portion is in sealing contact with the outer wall of the inner pipe.

[0014] Optionally, the first sealing portion has a first sealing lip and a second sealing lip. The first sealing lip is in sealing contact with the outer wall of the inner pipe, and the second sealing lip is in sealing contact with the inner wall of the insertion section. Both the first sealing lip and the second sealing lip extend along the circumferential direction of the sealing ring, and both the first sealing lip and the second sealing lip are arranged around the axis of rotation of the sealing ring for one week.

[0015] Optionally, an annular structural groove with an opening facing the connecting gap is formed between the first sealing lip and the second sealing lip.

[0016] Optionally, the shell assembly includes a shell body and a fixing member detachably mounted at the rear end of the shell body. The mounting hole is formed on the fixing member.

[0017] Optionally, the fixing member includes a connecting sleeve and a mounting sleeve arranged in sequence from front to back. The mounting sleeve is connected to the shell body through the connecting sleeve. An inner boss protrudes towards the inner pipe at the connection position between the connecting sleeve and the mounting sleeve. The inner boss continuously encloses the inner pipe for one week, and the inner boss and the inner wall of the mounting sleeve jointly enclose the mounting hole.

[0018] Optionally, the output pipe and the inner pipe are coaxially arranged. The output pipe further includes a main body section arranged at the rear end of the insertion section. The inner diameter of the main body section is greater than or equal to the inner diameter of the inner pipe.

[0019] The present utility model further provides a planing handle, which includes a handle housing and the motor assembly described in any one of the above. An installation cavity is provided in the handle housing, the motor assembly is fixedly arranged in the installation cavity, and the rear end of the output pipe extends out of the handle housing.

[0020] As described above, a motor assembly and a planing handle of the present utility model have the following beneficial effects: Since an output pipe is provided, the front end of the output pipe is connected to the housing assembly and is directly communicated with the rear end of the inner pipe. The liquid and tissue in the inner pipe can be discharged into the output pipe and discharged through the output pipe. At the same time, since there is a connection gap between the inner pipe and the output pipe, the inner pipe can rotate relative to the output pipe to output power. The sealing ring seals the rotation gap and the connection gap, preventing the liquid and tissue in the inner pipe from leaking from the connection between the inner pipe and the output pipe and entering the inside of the motor, ensuring the reliability of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It shows a partial cross-sectional structural schematic diagram of the connection between the output pipe and the motor in an embodiment of the present utility model;

[0022] Figure 2 It shows a partial enlarged cross-sectional structural schematic diagram of the housing assembly and the output pipe in an embodiment of the present utility model;

[0023] Figure 3 It shows a cross-sectional structural schematic diagram of the sealing cavity in an embodiment of the present utility model;

[0024] Figure 4 It shows a cross-sectional structural schematic diagram of the connection sleeve and the installation sleeve in an embodiment of the present utility model;

[0025] Figure 5 It shows a cross-sectional structural schematic diagram of the output pipe in an embodiment of the present utility model;

[0026] Figure 6 It shows Figure 1 a partial enlarged structural schematic diagram at the sealing ring in

[0027] Figure 7 It shows Figure 3 a partial enlarged structural schematic diagram at the sealing cavity in

[0028] Figure 8 It shows a partial enlarged structural schematic diagram of the cross-section of the sealing ring in an embodiment of the present utility model;

[0029] Figure 9 It shows a structural schematic diagram of the surgical power device in an embodiment of the present utility model.

[0030] Description of the reference numerals: motor 1, inner tube 2, housing assembly 3, sealing ring 4, output tube 5, rotation clearance 6, connection clearance 7, sealing cavity 8, outer cutter tube 9, cutter assembly 10, inner cutter tube 11, connecting sleeve 30, mounting sleeve 31, inner boss 32, rear cover 33, screw sleeve 34, mounting hole 35, annular structure groove 40, first sealing lip 41, second sealing lip 42, first sealing part 43, second sealing part 44, rotation hole 50, anti - detachment barb 51, limiting step 52, main sealing cavity 81, secondary sealing cavity 82. Detailed implementation manners

[0031] The following uses specific examples to illustrate the implementation manners of the present utility model. Those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification. The present utility model can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present utility model.

[0032] It should be noted that the illustrations provided in this embodiment only schematically illustrate the basic concept of the present utility model. Therefore, only the components related to the present utility model are shown in the drawings, rather than being drawn according to the number, shape, and size of the components during actual implementation. The type, quantity, and proportion of each component during actual implementation can be arbitrarily changed, and the layout type of its components may also be more complex. The structures, proportions, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those skilled in this technology to understand and read, and are not used to limit the limiting conditions under which the present utility model can be implemented. Therefore, they do not have technical essence. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects that the present utility model can produce and the purposes that can be achieved, should still fall within the scope that can be covered by the technical content disclosed in the present utility model. At the same time, in this specification, the orientation word "front" refers to the orientation of the instrument or component away from the operator, and the orientation word "rear" refers to the orientation of the instrument or component close to the operator. It is only for the convenience of clear narration and is not used to limit the scope under which the present utility model can be implemented. The change or adjustment of its relative relationship, without substantial change in the technical content, should also be regarded as the scope within which the present utility model can be implemented.

[0033] Please refer to Figures 1 to 9 , this embodiment provides a motor assembly, including a motor 1, an output tube 5, and a sealing ring 4. The motor 1 includes a housing assembly 3 and an inner tube 2 rotatably arranged in the housing assembly 3. During actual implementation, the motor 1 usually includes a stator and a rotor that are matched and arranged in the housing assembly 3. The stator is fixed in the housing assembly 3, the rotor is rotatably arranged in the housing assembly 3, the inner tube 2 is coaxially arranged in the rotor, and can rotate with the rotor; this motor 1 can be a micro - motor.

[0034] As Figures 1 to 4 shown, in this embodiment, the rear end of the inner tube 2 extends out of the housing assembly 3, so that the rear end of the inner tube 2 is exposed outside the housing assembly 3. The front end of the output tube 5 is connected to the housing assembly 3 and is inserted and communicated with the rear end of the inner tube 2. There is a connection gap 7 between the inner tube 2 and the output tube 5, and there is a rotational gap 6 between the outer wall of the rear end of the inner tube 2 and the housing assembly 3 in the radial direction of the rotor, so that the inner tube 2 can rotate flexibly relative to the housing assembly 3 and the output tube 5 to avoid interference. The front end of the output tube 5 is inserted and communicated with the rear end of the inner tube 2, which can enable liquids and tissues to directly enter the output tube 5 from the inner tube 2, which is beneficial to reducing the possibility of blockage in the tube, and the transportation of tissues does not require components outside the inner tube 2 and the output tube 5, and the structure is simple. The sealing ring 4 is sleeved on the inner tube 2, and at the same time seals the rotational gap 6 and the connection gap 7, preventing the liquids and tissues flowing from the inner tube 2 to the output tube 5 from flowing out through the connection gap, and also preventing the liquids outside the motor 1 from flowing into the interior of the motor 1 through the rotational gap 6 and damaging the motor 1.

[0035] Specifically, as Figures 1 to 5 shown, in this embodiment, the front end of the output tube 5 has an insertion section, and the rear end of the inner tube 2 is inserted into the insertion section and can rotate within the insertion section, that is, the front end of the output tube 5 has a part for inserting the inner tube 2. In this embodiment, the inner cavity of the insertion section is a rotation hole 50 for inserting the rear end of the inner tube 2, and the inner diameter of the rotation hole 50 is larger than the inner diameter of the output tube 5 at the rear part of the insertion section, so that the rotation hole 50 has sufficient dimensions to enable the inner tube 2 to rotate within the rotation hole 50. In this embodiment, the connection gap 7 includes the gap between the outer wall of the inner tube 2 and the inner wall of the insertion section. After the inner tube 2 is inserted into the insertion section, it can also rotate flexibly within the insertion section to avoid interference with the inner wall of the insertion section.

[0036] At the same time, an installation hole 35 is provided on the end face of the housing assembly 3 near one end of the output tube 5 along the axial direction of the rotor. The rear end of the inner tube 2 is inserted into the installation hole 35, and at least part of the front end of the output tube 5 is arranged in the installation hole 35. The inner wall of the insertion section, the hole wall of the installation hole 35, and the outer wall of the inner tube 2 enclose a sealing cavity 8. The sealing cavity 8 is respectively communicated with the rotational gap 6 and the connection gap 7. The sealing ring 4 is arranged in the sealing cavity 8, and the sealing ring 4 is in sealing contact with the inner wall of the insertion section, the hole wall of the installation hole 35, and the outer wall of the inner tube 2 respectively, so as to realize the sealing of the connection gap 7 and the sealing gap.

[0037] As Figure 7 shown, in this embodiment, the sealing cavity 8 includes a main sealing cavity 81 and a secondary sealing cavity 82, and the main sealing cavity 81 and the secondary sealing cavity 82 are arranged in sequence from the inside to the outside in the radial direction. As Figure 6 、 Figure 8As shown, the sealing ring 4 includes a first sealing portion 43 and a second sealing portion 44. The second sealing portion 44 is located in the secondary sealing cavity 82 and is pressed between the bottom of the mounting hole 35 and the end face of the plug-in section. The first sealing portion 43 is arranged in the main sealing cavity 81. The first sealing portion 43 is radially arranged between the second sealing portion 44 and the outer wall of the inner tube 2, and the first sealing portion 43 is in sealing contact with the outer wall of the inner tube 2. In this embodiment, the first sealing portion 43 and the second sealing portion 44 are connected as a whole, and there are no holes or gaps between the first sealing portion 43 and the second sealing portion 44, so as to prevent liquid from passing through between the first sealing portion 43 and the second sealing portion 44. The first sealing portion 43 is in sealing contact with the outer wall of the inner tube 2, blocking the liquid and tissue waiting to be discharged outside the sealing ring 4, and preventing the liquid from entering the motor 1 along the outer wall of the inner tube 2. The second sealing portion 44 is located within the secondary sealing cavity 82 and is compressed between the bottom of the mounting hole 35 and the end face of the plug-in section. That is, the second sealing portion 44 is in sealing contact with the bottom of the mounting hole 35 and the end face of the plug-in section, respectively. The second sealing portion 44 acts as a barrier between the bottom of the mounting hole 35 and the end face of the plug-in section, preventing liquids, tissues, and other substances outside the sealing ring 4 from passing through the second sealing portion 44 and entering the interior of the motor 1. The first sealing portion 43 and the second sealing portion 44 provide multiple seals, resulting in a good sealing effect. The bottom of the mounting hole 35 and the end face of the plug-in section compress the second sealing portion 44, limiting the sealing ring 4 and reducing its displacement during the rotation of the inner tube 2, which helps maintain the sealing effect of the sealing ring 4.

[0038] In this embodiment, the inner wall of the mounting hole 35 is provided with internal threads, and the outer wall of the front end of the output tube 5 is provided with external threads. The front end of the output tube 5 is threadedly connected to the mounting hole 35. The threaded pair between the output tube 5 and the mounting hole 35 is arranged along the extension direction of the inner tube 2. The relative position between the output tube 5 and the mounting hole 35 can be adjusted by the threaded pair, thereby adjusting the pressure effect of the bottom of the mounting hole 35 and the end surface of the plug section on the second sealing portion 44.

[0039] Specifically, such as Figure 8 As shown, in this embodiment, the first sealing portion 43 has a first sealing lip 41 and a second sealing lip 42. The first sealing lip 41 and the second sealing lip 42 extend along the circumference of the sealing ring 4 to form an annular sealing lip. The first sealing lip 41 is in sealing contact with the outer wall of the inner tube 2, and the second sealing lip 42 is in sealing contact with the inner wall of the plug-in section. The sealing lips are relatively soft and have good contact with the sealed component, which helps to enhance the sealing effect of the first sealing portion 43. The first sealing lip 41 and the second sealing lip 42 are both arranged around the axis of rotation of the sealing ring 4 to completely seal the gap between the sealing ring 4 and the inner wall of the plug-in section.

[0040] Specifically, in this embodiment, an annular structural groove 40 with an opening facing the connection gap 7 is formed between the first sealing lip 41 and the second sealing lip 42 of the first sealing portion 43. On the one hand, if the structural strength of the first sealing portion 43 is too high and the deformation amount is insufficient, the fit with the component to be sealed is poor, affecting the sealing effect. If the structural strength of the first sealing portion 43 is too low and the radial supporting force is insufficient, it also affects the degree of fit between the first sealing portion 43 and the component to be sealed. The annular structural groove 40 can reduce the structural strength of the first sealing portion 43. By adjusting the size and position of the annular structural groove 40, the structural strength of the first sealing portion 43 can be adjusted to ensure the deformation amount of the first sealing portion 43, thereby ensuring the sealing effect of the first sealing portion 43. On the other hand, when tissue fluid or waste liquid enters the sealing cavity 8 at the connection gap 7 between the inner tube 2 and the output tube 5, due to the opening of the annular structural groove 40 facing the connection gap 7, the tissue fluid or waste liquid can enter the annular structural groove through this opening, reducing the accumulation of these liquids on the outer wall of the inner tube 2 and achieving a better sealing effect.

[0041] Optionally, an elastic support member is arranged in the annular structural groove 40. The elastic support member provides an additional radial supporting force to ensure the degree of fit between the first sealing portion 43 and the component to be sealed. The elastic support member can be a metal spring, or a protective layer such as silica gel can be coated on the metal spring to improve the service life of the metal spring and the sealing ring 4.

[0042] As Figures 1 to 4 shown, in this embodiment, the housing assembly 3 includes a housing body and a fixing member detachably installed at the rear end of the housing body, and an installation hole 35 is formed on the fixing member. In some embodiments, the fixing member is integrally formed, and the installation hole 35 is directly formed on the fixing member. In this embodiment, the fixing member includes a connecting sleeve 30 and an installation sleeve 31 arranged in sequence from front to back. The installation sleeve 31 is connected to the housing body through the connecting sleeve 30. An inner boss 32 protrudes inwardly from the connection position between the connecting sleeve 30 and the installation sleeve 31 around the inner tube 2 for a continuous week. The wall surface of the inner boss 32 and the inner wall of the installation sleeve 31 together form the installation hole 35. During the enclosure of the inner boss 32, a through hole for the inner tube 2 to pass through is left, and the gap between the top surface of the inner boss 32 and the outer wall of the inner tube 2 is the rotation gap 6.

[0043] In this embodiment, the output tube 5 is coaxially arranged with the inner tube 2. The output tube 5 further includes a main body section arranged at the rear end of the insertion section. The main body section is located behind the insertion section, and the inner diameter of the main body section is greater than or equal to the inner diameter of the inner tube 2. When the liquid and tissue in the inner tube 2 are discharged from the inner tube 2, they flow into the inner cavity of the main body section. The inner diameter of the main body section is greater than or equal to the inner diameter of the inner tube 2, which is beneficial to the flow of the liquid and tissue, reduces the blockage of the liquid and tissue, and reduces the probability of blockage of the output tube 5.

[0044] As Figure 5As shown, in this embodiment, the rear end of the main body section, i.e., the rear end of the output tube 5, is provided with an anti-detachment barb 51. The rear end of the output tube 5 is used to connect to an external pipeline, which is usually a hose. The anti-detachment barb 51 can improve the connection between the output tube 5 and the hose and reduce the chance of the hose accidentally falling off.

[0045] like Figures 1 to 9 As shown, this embodiment also provides a planing handle, comprising a handle housing and a motor assembly as described in any of the above items. The handle housing defines a mounting cavity, in which the motor assembly is fixedly mounted, and the rear end of the output tube 5 extends out of the handle housing. The handle housing is used for gripping by an operator and also serves to protect and secure the motor assembly.

[0046] Specifically, the handle housing includes a handle shell, a rear cover 33, and a screw sleeve 34. A mounting cavity is formed in the handle shell, and the motor assembly is fixedly mounted in the mounting cavity. The rear cover 33 is arranged on the rear end of the handle shell, and is provided with an opening for the output tube 5 to pass through. The rear cover 33 is removable, which facilitates the installation and disassembly of the motor assembly. The screw sleeve 34 is arranged on the outside of the output tube 5 through a threaded fit. The screw sleeve 34 is located behind the rear cover 33 and abuts against the rear end of the rear cover 33. The screw sleeve 34 limits the rear cover 33 to prevent it from accidentally falling off.

[0047] Specifically, in this embodiment, the outer contour of the output tube 5 includes a limiting step 52 facing away from the motor assembly, and the rear cover 33 is disposed between the limiting step 52 and the screw sleeve 34. The limiting step 52 limits the rear cover 33 and cooperates with the screw sleeve 34 to secure the rear cover 33.

[0048] like Figure 9 As shown, this embodiment also provides a surgical power device, including the handle as described above and a tool assembly 10 adapted to the handle. The tool assembly 10 generally includes an outer tool tube 9 and an inner tool tube 11 sleeved in the outer tool tube 9. The front end of the inner tool tube 11 is provided with a cutting edge for cutting diseased tissue and the like. The rear end of the inner tool tube 11 is transmission-connected and communicated with the inner tube 2. The inner tube 2 drives the inner tool tube 11 to rotate, providing cutting power for the inner tool tube 11. At the same time, the liquid and tissue sucked out of the inner tool tube 11 can be discharged into the inner tube 2, and discharged into the output tube 5 through the inner guide tube, and discharged from the output tube 5 to the outside of the motor 1.

[0049] In summary, for the motor assembly, the shaving handle, and the surgical power device provided in this embodiment, since the output pipe 5 is provided, the front end of the output pipe 5 is connected to the housing assembly 3 and is directly communicated with the rear end of the inner pipe 2. The liquid and tissue in the inner pipe 2 can be discharged into the output pipe 5 and discharged by the output pipe 5. At the same time, since there is a connection gap 7 between the inner pipe 2 and the output pipe 5, the inner pipe 2 can rotate relative to the output pipe 5 to output power. The sealing ring 4 seals the rotation gap 6 and the connection gap 7, preventing the liquid and tissue in the inner pipe 2 from leaking from the connection between the inner pipe 2 and the output pipe 5 and entering the interior of the motor 1, thus ensuring the reliability of the product.

[0050] The above embodiments are only illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A motor assembly, characterized in that, Comprising: A motor, the motor includes a housing assembly and an inner tube rotatably disposed within the housing assembly, the rear end of the inner tube extends out of the housing assembly, and there is a rotational gap between the outer wall of the rear end of the inner tube and the housing assembly; An output tube, the front end of the output tube is connected to the housing assembly, and is inserted and communicated with the rear end of the inner tube, and there is a connection gap between the inner tube and the output tube; A sealing ring, the sealing ring is sleeved on the inner tube and simultaneously seals the rotational gap and the connection gap.

2. The motor assembly according to claim 1, characterized in that: The front end of the output tube has an insertion section, the rear end of the inner tube is inserted into the insertion section and rotates within the insertion section, and the connection gap includes the gap between the outer wall of the inner tube and the inner wall of the insertion section; On the end face of the housing assembly near one end of the output tube, an installation hole is provided along the axis direction of the rotor of the motor, the rear end of the inner tube is inserted into the installation hole, at least part of the front end of the output tube is disposed within the installation hole, the inner wall of the insertion section, the hole wall of the installation hole and the outer wall of the inner tube enclose a sealing cavity, the sealing cavity is respectively communicated with the rotational gap and the connection gap, the sealing ring is disposed within the sealing cavity, and the sealing ring is in sealing contact with the inner wall of the insertion section, the hole wall of the installation hole and the outer wall of the inner tube respectively.

3. The motor assembly according to claim 2, wherein: The inner wall of the installation hole is provided with internal threads, the outer wall of the front end of the output tube is provided with external threads, and the front end of the output tube is threadedly connected to the installation hole.

4. The motor assembly according to claim 2, wherein The sealing cavity includes a main sealing cavity and a secondary sealing cavity sequentially arranged from inside to outside in the radial direction, the sealing ring includes a first sealing portion and a second sealing portion, the second sealing portion is located within the secondary sealing cavity and is pressed between the bottom of the installation hole and the end face of the insertion section, the first sealing portion is disposed within the main sealing cavity, and the first sealing portion is disposed in the radial direction between the second sealing portion and the outer wall of the inner tube, and the first sealing portion is in sealing contact with the outer wall of the inner tube.

5. The motor assembly according to claim 4, characterized in that: The first sealing portion has a first sealing lip and a second sealing lip, the first sealing lip is in sealing contact with the outer wall of the inner tube, the second sealing lip is in sealing contact with the inner wall of the insertion section, the first sealing lip and the second sealing lip both extend circumferentially along the sealing ring, and the first sealing lip and the second sealing lip respectively wind around the axis of rotation of the sealing ring for one week.

6. The motor assembly according to claim 5, wherein: An annular structural groove with an opening facing the connection gap is formed between the first sealing lip and the second sealing lip.

7. The motor assembly according to any one of claims 2-6, characterized in that: The housing assembly includes a housing body and a fixing member detachably installed at the rear end of the housing body, and the installation hole is formed on the fixing member.

8. The motor assembly according to claim 7, characterized in that: The fixing member includes a connecting sleeve and an installation sleeve sequentially arranged from front to back, the installation sleeve is connected to the housing body through the connecting sleeve, an inner boss protrudes towards the inner tube at the connection position of the connecting sleeve and the installation sleeve, the inner boss continuously surrounds the inner tube for one week, and the inner boss and the inner wall of the installation sleeve jointly enclose the installation hole.

9. The motor assembly according to claim 2, wherein: The output pipe is coaxially arranged with the inner pipe. The output pipe further includes a main body section provided at the rear end of the insertion section, and the inner diameter of the main body section is greater than or equal to the inner diameter of the inner pipe.

10. A planing handle, characterized in that, It includes a handle housing and the motor assembly according to any one of claims 1 to 9. An installation cavity is provided in the handle housing, the motor assembly is fixedly arranged in the installation cavity, and the rear end of the output pipe extends out of the handle housing.

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