Electric tool

Abstract

The electric tool comprises a shell, a motor, a fan and a working head, the shell comprises a machine shell and a head shell, the machine shell is provided with an air outlet hole, a first part of the head shell is inserted into one end of the machine shell in the length direction of the machine shell, an air inlet channel is arranged at the overlapping position of the machine shell and the first part, the motor is arranged in the machine shell, and the working head is arranged in the machine shell. The fan is arranged in the machine shell and used for sucking external air into the machine shell from the air inlet channel and discharging the external air out of the air outlet holes, and the working head is arranged at the end, away from the machine shell, of the head shell and is in transmission connection with the motor. According to the electric tool, the head shell is inserted into the machine shell, the air inlet channel is formed between the head shell and the machine shell, the air inlet channel is located on the side face of the electric tool, external air can be led into the shell under the operation of the fan, the motor is cooled, and due to the fact that the air inlet channel is in contact with the head shell, the cooling effect is good. And the airflow can also cool the head shell with the high temperature, so that the heat dissipation effect of the electric tool is improved.

Description

Technical Field

[0001] This utility model relates to the field of power tool technology, and in particular to a power tool. Background Technology

[0002] This section provides only background information relevant to this disclosure and is not necessarily prior art.

[0003] A constant torque electric wrench is an electric wrench that can automatically control the torque. It is suitable for use in projects such as bridge structures, large steel towers, steel structure workshops, metallurgical equipment frames, large crane frames, and mine steel frames that require high-strength bolt connections. It can also be used to tighten bolts in large diesel engines, power generation equipment, and chemical equipment that require constant clamping force.

[0004] Most constant torque electric wrenches are driven by electric motors. The high-speed rotating motor will generate a lot of heat. If it is not cooled in time, it will cause the motor to overheat or even burn out. Therefore, the normal operation of power tools requires a good heat dissipation system. Utility Model Content

[0005] The purpose of this invention is to at least solve the problem of poor heat dissipation in existing power tools during use. This purpose is achieved through the following technical solution:

[0006] This utility model proposes an electric tool, comprising:

[0007] The outer casing includes a housing and a head housing. The housing has an air outlet. A first part of the head housing is inserted into the housing. Along the length of the housing, the first part of the head housing is inserted at one end of the housing. An air inlet channel is provided at the overlap between the housing and the first part.

[0008] The motor is located inside the housing;

[0009] A fan is disposed inside the housing. The fan is used to draw outside air into the housing through the air inlet channel and exhaust it through the air outlet.

[0010] The working head is located at the end of the head shell opposite to the machine housing and is connected to the motor drive.

[0011] The power tool proposed in this utility model has a head shell inserted into the machine housing, forming an air intake channel between the head shell and the machine housing. The air intake channel is located on the side of the power tool, which can introduce external air into the housing under the operation of the fan to cool the motor. Furthermore, since the air intake channel is in contact with the head shell, the airflow can also cool the head shell, which has a high temperature, thereby improving the heat dissipation effect of the power tool.

[0012] In addition, the power tool according to this utility model may also have the following additional technical features:

[0013] In some embodiments of this utility model, along the axial direction of the motor, the air outlet is disposed at one end of the housing, the head shell is inserted at the other end of the housing, the motor is located between the air outlet and the air inlet channel, and the fan is disposed opposite to the air outlet.

[0014] In some embodiments of this utility model, the outer wall of the first part is spaced apart from the inner wall of the housing, and at least one air inlet channel is formed between the first part and the housing;

[0015] Alternatively, the housing may be provided with at least one of the aforementioned air inlet channels;

[0016] Alternatively, the first part may be provided with at least one of the aforementioned air inlet channels.

[0017] In some embodiments of this utility model, the power tool further includes an intermediate cover, which is installed on the first part and located inside the housing. The intermediate cover has a through hole. The power tool further includes a transmission assembly, a portion of which is located inside the through hole. The motor is connected to the working head via the transmission assembly. The intermediate cover and / or the head shell are metal parts.

[0018] In some embodiments of this utility model, the power tool further includes:

[0019] handle;

[0020] Rigid connectors with an integrated structure;

[0021] A plurality of first elastic bodies are provided, the plurality of first elastic bodies being spaced apart along the length direction of the rigid connector, and the rigid connector being connected to the outer shell through the first elastic bodies;

[0022] A plurality of second elastic bodies are provided, the plurality of second elastic bodies being spaced apart along the length direction of the rigid connector, and the rigid connector being connected to the handle via the second elastic bodies;

[0023] Fastening assembly for securing the housing to the handle.

[0024] In some embodiments of this utility model, the outer surface of the outer shell partially protrudes to form two lugs, the number of rigid connectors is two, the two rigid connectors are arranged opposite to each other, the lugs are arranged between the two rigid connectors, the two rigid connectors located on both sides of the lugs are connected to the lugs through a plurality of first elastic bodies, and the two rigid connectors located on both sides of the lugs are connected to the handle through a plurality of second elastic bodies.

[0025] In some embodiments of this utility model, the rigid connector has two first through holes and two second through holes. Along the length direction of the rigid connector, the two first through holes are located between the two second through holes. The fastening assembly includes two first fasteners and two second fasteners. The two first fasteners are respectively inserted through the two first through holes. The first fasteners fasten the outer shell to the handle. The two second fasteners are respectively inserted through the two second through holes. The second fasteners fasten the outer shell to the handle. The first elastic body is sleeved on the first fastener and located between the outer shell and the rigid connector. The second elastic body is sleeved on the second fastener and located between the rigid connector and the handle.

[0026] In some embodiments of this utility model, the outer surface of the outer shell partially protrudes to form two lugs. There are two rigid connectors, which are arranged opposite to each other. The lugs are arranged between the two rigid connectors. The two rigid connectors located on both sides of the lugs are connected to the lugs through a plurality of first elastic bodies. The two rigid connectors located on both sides of the lugs are connected to the handle through a plurality of second elastic bodies. The first fastener passes through the two oppositely arranged rigid connectors, and the second fastener passes through the two oppositely arranged rigid connectors.

[0027] In some embodiments of this utility model, the two lugs are respectively connected to the housing and the head shell. The rigid connector also has a third through hole. Along the length direction of the rigid connector, the third through hole is located between the two first through holes and between the two lugs. The fastening assembly also includes a third fastener, which passes through the third through hole and fastens the housing to the handle.

[0028] In some embodiments of this utility model, the handle includes a housing with a receiving cavity formed inside. The lug, the rigid connector, the first elastic body, and the second elastic body are all disposed within the receiving cavity. The handle also includes two connecting posts located within the receiving cavity. One end of each connecting post is connected to the inner wall of the housing. The two connecting posts are coaxially disposed with the two second fasteners, respectively. The connecting posts pass through the second through hole and the second elastic body, and a portion of the second fastener is inserted into the connecting post.

[0029] In some embodiments of this utility model, a first groove is provided on each of the opposite sides of the lug. The first groove communicates with the first through hole. The first elastic body is installed in the first groove, and a portion of the first elastic body protrudes from the first groove. In the two rigid connectors arranged opposite to each other, a second groove is provided on the side of one rigid connector facing away from the other rigid connector. The second groove communicates with the second through hole. The second elastic body is installed in the second groove, and a portion of the second elastic body protrudes from the second groove. Attached Figure Description

[0030] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0031] Figure 1 A schematic diagram of the structure of a power tool according to an embodiment of the present invention is shown.

[0032] Figure 2 A partial structural diagram of a power tool (concealed housing) according to an embodiment of the present invention is shown schematically.

[0033] Figure 3 A partial structural diagram of a power tool (with concealed handle) according to an embodiment of the present invention is shown schematically.

[0034] Figure 4 A partial structural diagram of the connection between the handle and the housing according to an embodiment of the present invention is shown schematically from a first perspective.

[0035] Figure 5 A partial structural diagram of the connection between the handle and the housing (hiding the rigid connector) according to an embodiment of the present invention is shown schematically.

[0036] Figure 6A partial structural diagram of the connection between the handle and the housing according to an embodiment of the present invention is shown schematically from a second perspective.

[0037] Figure 7 A schematic diagram of the internal structure of the connection between the handle and the housing according to an embodiment of the present invention is shown.

[0038] The attached figures are labeled as follows:

[0039] 101. Motor; 102. Fan; 103. Working head;

[0040] 10. Outer casing; 11. Housing; 111. Air outlet; 12. Head cover; 13. Air inlet channel; 14. Middle cover; 15. Lug;

[0041] 20. Handle; 21. Housing; 211. Fixing hole; 22. Mounting cavity; 23. Connecting post;

[0042] 30. Rigid connector; 31. First through hole; 32. Second through hole; 33. Third through hole;

[0043] 40. First elastomer; 41. Second elastomer;

[0044] 50. Fastening assembly; 51. First fastener; 52. Second fastener; 53. Third fastener. Detailed Implementation

[0045] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0046] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0047] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0048] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure is flipped, an element described as "below other elements or features" or "below other elements or features" would subsequently be oriented as "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0049] like Figures 1 to 7 As shown, Figure 2-4 The direction A in the middle represents the length direction of the rigid connector 30. This utility model proposes an electric tool, including:

[0050] The outer casing 10 includes a housing 11 and a head casing 12. The housing 11 has an air outlet 111. A first part of the head casing 12 is inserted into the housing 11, and at least one air inlet channel 13 is formed between the first part and the housing 11.

[0051] Motor 101 is located inside housing 11;

[0052] Fan 102 is installed inside the housing 11. Fan 102 is used to draw external air into the housing 11 through the air inlet channel 13 and exhaust it through the air outlet 111.

[0053] The working head 103 is located at the end of the head shell 12 away from the machine housing 11 and is connected to the motor 101 for transmission.

[0054] It is understandable that the housing 11 and head shell 12 can be cylindrical structures with openings at both axial ends. The housing 11 houses the drive device such as the motor 101, while the head shell 12 houses the transmission mechanism and the working head 103. The working head 103 can be a wrench socket, a drill bit, a screwdriver, or other similar device, depending on the actual needs of the power tool. The motor 101 and the working head 103 can be coaxially arranged with the housing 11 and head shell 12. The first part of the head shell 12 is the part of the head shell 12 along its own axial direction. This first part is also cylindrical, and its outer diameter is smaller than the opening at the axial end of the housing 11, so that the first part can be inserted into the housing 11. The first part and the housing 11 can be fixed by buckles or bolts, and there is a gap between the first part and the housing 11 to form an air intake channel 13, so that the gap can connect the inside of the housing 11 with the outside. Driven by the fan 102, the outside air enters the inside of the housing 11 through the air intake channel 13 to dissipate heat from the motor 101, etc., and the airflow can also carry away the heat on the head shell 12, thereby dissipating heat from the working head 103 connected to the head shell 12.

[0055] The power tool proposed in this utility model has a head shell 12 inserted into the housing 11, so that an air intake channel 13 is formed between the head shell 12 and the housing 11. The air intake channel 13 is located on the side of the power tool, and can introduce external air into the housing 10 under the operation of the fan 102 to cool the motor 101. Furthermore, since the air intake channel 13 is in contact with the head shell 12, the airflow can also cool the head shell 12 which has a high temperature, thereby improving the heat dissipation effect of the power tool.

[0056] In some embodiments of this utility model, along the axial direction of the motor 101, the air outlet 111 is disposed at one end of the housing 11, the head shell 12 is inserted at the other end of the housing 11, the motor 101 is located between the air outlet 111 and the air inlet channel 13, and the fan 102 is disposed opposite to the air outlet 111.

[0057] Understandably, the air outlet 111 is located at the rear end of the housing 11. The air outlet 111 can be formed by a perforated structure. The fan 102 is positioned opposite to the air outlet 111 and is driven by the motor 101. The motor 101 is located between the air outlet 111 and the head housing 12, so that the airflow in the air inlet channel 13 can flow through the motor 101 to the air outlet 111, thereby achieving air cooling of the motor 101 and improving the overall heat dissipation effect of the machine.

[0058] In some embodiments of the present invention, the outer wall of the first part is spaced apart from the inner wall of the housing 11, and at least one air inlet channel 13 is formed between the first part and the housing 11.

[0059] Alternatively, at least one air inlet duct 13 is provided on the housing 11;

[0060] Alternatively, the first part may have at least one air inlet duct 13.

[0061] It is understandable that the air intake channel 1313 can be formed by the space separated from the first part and the casing 1111. This space connects the outside world and the inside of the casing 11. With the help of the fan 102, it can introduce outside air into the casing 11 for cooling. The air intake channel 13 can also be opened on the casing 11 and located at the overlap between the casing 11 and the first part. It can also cool the inside of the casing 11 and the head shell. The air intake channel 13 can also be set on the first part. For example, the air intake channel 13 can be opened on the first part at the overlap with the casing 11 and connect to the inside of the first part. Alternatively, a solid structure can be set with the air intake channel 13 inside to introduce outside air into the casing 11 for heat dissipation.

[0062] In some embodiments of this utility model, there are multiple air inlet channels 13, and the multiple air inlet channels 13 are arranged at intervals along the circumferential direction of the motor 101.

[0063] It is understood that the air intake channel 13 is formed by the space between the inner wall of the head shell 12 and the outer surface of the housing 11. The head shell 12 can be connected to the housing 11 by providing multiple connecting structures spaced apart along the circumferential direction of the motor 101 in its inner cavity. The multiple connecting structures divide the space into multiple air intake channels 13. Specifically, one air intake channel 13 can be provided on each of the two transverse sides of the housing 11. Providing multiple air intake channels 13 can increase the air intake volume, thereby improving the air cooling effect on the motor 101.

[0064] In some embodiments of this utility model, the power tool further includes an intermediate cover 14, which is installed in the first part and located inside the housing 11. The intermediate cover 14 has a through hole. The power tool also includes a transmission assembly, part of which is located in the through hole. The motor 101 is connected to the working head 103 through the transmission assembly. The intermediate cover 14 and / or the head shell 12 are metal parts.

[0065] It is understood that the intermediate cover 14 can be a cylindrical structure with end plates. The function of the intermediate cover 14 is to support the transmission components and improve the strength and reliability of the overall housing 10 structure. The intermediate cover 14 can be fixedly connected to the first part by a snap-fit ​​structure or by bolts. The intermediate cover 14 has a through hole in the middle. The shaft structure that drives the motor 101 and the working head 103 passes through the intermediate cover 14 through the through hole. The intermediate cover 14 can also be provided with bearings and other support structures that connect to the transmission components. The intermediate cover 14 and / or the head shell 12 can be made of metal, so that it has good heat conduction effect. Then, when in contact with the airflow of the air inlet channel 13, the heat on the intermediate cover 14 and the head shell 12 is quickly carried away, thereby achieving rapid heat dissipation.

[0066] In some embodiments of this utility model, the power tool further includes:

[0067] Handle 20;

[0068] Rigid connector 30 with integrated structure;

[0069] Multiple first elastic bodies 40 are spaced apart along the length direction of the rigid connector 30, and the rigid connector 30 is connected to the outer shell 10 through the first elastic bodies 40.

[0070] Multiple second elastic bodies 41 are spaced apart along the length direction of the rigid connector 30, and the rigid connector 30 is connected to the handle 20 through the second elastic bodies 41.

[0071] Fastening assembly 50 is used to fasten housing 10 to handle 20.

[0072] It is understandable that the handle 20 is connected to the housing 10 via a rigid connector 30 and a fastening assembly 50. A first elastic body 40 and a second elastic body 41 with vibration damping effects are provided at the connection between the handle 20 and the housing 10. The rigid connector 30 is an integral structure with higher strength. The first elastic body 40 is located at the connection between the housing 10 and the rigid connector 30, and the second elastic body 41 is located at the connection between the handle 20 and the rigid connector 30. The first fastener 51 tightens the housing 10 and the rigid connector 30, and the second fastener 52 secures the handle 20 to the rigid connector 30. This achieves a multi-layered vibration damping effect without increasing the space required for the handle 20. The added components of this vibration damping structure are relatively simple and low in cost. Furthermore, the rigid connector 30 is a rigid structure with minimal deformation. Under static conditions, it does not affect the assembly position relationship between the handle 20 and the housing 11, which is beneficial for assembly and production, resulting in a higher production line pass rate.

[0073] In some embodiments of this utility model, the rigid connector 30 has two first through holes 31 and two second through holes 32. Along the length of the rigid connector 30, the two first through holes 31 are located between the two second through holes 32. The fastening assembly 50 includes two first fasteners 51 and two second fasteners 52. The two first fasteners 51 are respectively inserted through the two first through holes 31 and are fixedly connected to the outer shell 10 and the handle 20 respectively. The two second fasteners 52 are respectively inserted through the two second through holes 32 and are fixedly connected to the outer shell 10 and the handle 20 respectively. The first elastic body 40 is sleeved on the first fasteners 51 and is located between the outer shell 10 and the rigid connector 30. The second elastic body 41 is sleeved on the second fasteners 52 and is located between the rigid connector 30 and the handle 20.

[0074] Understandably, two first through holes 31 are spaced apart along the length of the rigid connector 30, and two second through holes 32 are spaced apart along the length of the rigid connector 30, with the two first through holes 31 located between the two second through holes 32. Two first fasteners 51 are respectively inserted into the two first through holes 31, and the first fasteners 51 are also connected to the outer casing 10 to fix the two oppositely arranged rigid connectors 30 to the two lugs 15 respectively. Two second fasteners 52 are respectively inserted into the two second through holes 32, and the second fasteners 52... It is also connected to the handle 20 to connect two oppositely arranged rigid connectors 30 to the housing 10 respectively, so that the handle 20 is connected to the housing 10 through the rigid connectors 30. A first elastic body 40 and a second elastic body 41 are also provided at the connection between the rigid connectors 30 and the handle 20 and the housing 10, so that the vibration from the housing 10 can be absorbed by the first elastic body 40, reducing the vibration transmitted to the rigid connector 30. The remaining vibration on the rigid connector 30 is absorbed by the second elastic body, reducing the vibration from being transmitted to the handle 20, thereby achieving a good vibration reduction effect.

[0075] In some embodiments of this utility model, the outer surface of the outer shell 10 is partially protruding to form two lugs 15. There are two rigid connectors 30, which are arranged opposite to each other. The lugs 15 are arranged between the two rigid connectors 30. The two rigid connectors 30 located on both sides of the lugs 15 are connected to the lugs 15 through a plurality of first elastic bodies 40, and the two rigid connectors 30 located on both sides of the lugs 15 are connected to the handle 20 through a plurality of second elastic bodies 41.

[0076] It is understood that the lower side of the outer shell 10 can be integrally formed with a lug 15. The lug 15 can be a plate-shaped structure and is connected to the housing 11 and / or the head shell 12. Two rigid connectors 30 can be arranged opposite each other, so that the lug 15 can be clamped between the two rigid connectors 30, improving the reliability of the connection. The lug 15 and the rigid connector 30 can be fastened together by the first fastener 51, and the connection is clamped with a first elastic body 40 to absorb the vibration from the lug 15 and reduce the vibration from being transmitted to the rigid connector 30, thereby improving the user experience. By setting two lugs 15, it is not easy for the handle 20 and the outer shell 10 to have relative displacement. The two rigid connectors 30 clamping the lug 15 makes the connection more reliable, thereby making the connection between the handle 20 and the outer shell 10 more reliable.

[0077] In some embodiments of this utility model, the two lugs 15 are respectively connected to the housing 11 and the head shell 12. The rigid connector 30 also has a third through hole 33. Along the length direction of the rigid connector 30, the third through hole 33 is located between the two first through holes 31 and between the two lugs 15. The fastening assembly 50 also includes a third fastener 53, which passes through the third through hole 33 and is fixedly connected to the outer shell 10 and the handle 20 respectively.

[0078] It is understandable that a lug 15 can be provided on both the housing 11 and the head shell 12 so that both the housing 11 and the head shell 12 are connected to the rigid connector 30 through the lug 15, thereby further improving the reliability of the connection. Furthermore, a third through hole 33 is provided in the middle of the rigid connector 30, and a third fastener 53 is passed through the third through hole 33. The third fastener 53 is connected to the outer shell 10 and the handle 20 respectively to further limit and fix the rigid connector 30, thereby improving the vibration direction and amplitude of the rigid connector 30 when subjected to vibration, and improving the reliability of the overall structure. The first fastener 51 can be a bolt or a screw. A first through hole 31 can be provided on the rigid connector 30. The two first elastic bodies 40 are annular. A through hole is also provided on the lug 15 so that the first fastener 51 can be sequentially inserted into the rigid connector 30, the first elastic body 40 located on one side of the lug 15, the lug 15, the first elastic body 40 located on the other side of the lug 15, and the rigid connector 30, thus fastening both rigid connectors 30 to the lug 15. The second fastener 52 can be a bolt or a screw. The two ends of the second fastener 52 It can be screwed into the fixing holes 211 on the two opposite side walls of the housing 21 to achieve connection. The middle part of the second fastener 52 passes through the second through hole 32 and the second elastic body 41 located on the rigid connector 30. Tightening the second fastener 52 can pull the two opposite side walls of the housing 21 closer together, so that the connecting platform on the two side walls abuts against the two second elastic bodies 41 respectively, so that the second elastic body 41 is sandwiched between the housing 21 and the rigid connector 30, thereby achieving the vibration reduction effect at the connection between the handle 20 and the outer shell 10.

[0079] In some embodiments of this utility model, the handle 20 includes a housing 21, and a receiving cavity is formed inside the housing 21. The lug 15, the rigid connector 30, the first elastic body 40 and the second elastic body 41 are all located inside the receiving cavity. The handle 20 also includes two connecting posts 23 located inside the receiving cavity. One end of the connecting post 23 is connected to the housing 21. The two connecting posts 23 are coaxially arranged with two second fasteners 52 respectively. The connecting posts 23 pass through the second through hole 32 and the second elastic body 41. Part of the second fasteners 52 are inserted into the connecting posts 23.

[0080] It is understood that the mounting cavity 22 may be provided with a connecting post 23 for the insertion of the second fastener 52. The connecting post 23 may be integrally formed with the housing 21, and the connecting post 23 and the second fastener 52 are coaxially arranged. The connecting post 23 is sequentially inserted through the annular second elastic body 41 on one side of the rigid connector 30, the second through hole 32 of the rigid connector 30, and the annular second elastic body 41 on the other side of the rigid connector 30. After the second fastener 52 is inserted into the connecting post 23 after being inserted into the housing 21, the housing 21 and the second connecting part are fastened together. The connecting post 23 may have internal threads. The second fastener 52 may be a screw or bolt, which is inserted into the housing 21 and mates with the screw hole on the housing 21, and is also screwed to the connecting post 23.

[0081] In some embodiments of this utility model, a first groove is provided on each of the opposite sides of the lug 15. The first groove communicates with the first through hole 31. The first elastic body 40 is installed in the first groove, and a portion of the first elastic body 40 protrudes out of the first groove. In the two rigid connectors 30 arranged opposite to each other, a second groove is provided on the side of one rigid connector 30 facing away from the other rigid connector 30. The second groove communicates with the second through hole 32. The second elastic body 41 is installed in the second groove, and a portion of the second elastic body 41 protrudes out of the second groove.

[0082] Understandably, a first, roughly cylindrical groove can be provided on each of the opposite sides of the lug 15. A first elastic body 40 is installed in the first groove. The first elastic body 40 is cylindrical or frustum-shaped. A second groove, also cylindrical or frustum-shaped, is provided on the side of one rigid connector 30 opposite to the other. The second elastic body 41 can be cylindrical or frustum-shaped and has a second through-hole. The second elastic body 41 can be embedded in the second groove to achieve connection with the second connecting part and improve connection reliability. The second elastic body 41 can also partially protrude from the second groove to space the part where the housing 21 and the second elastic body 41 are connected from the rigid connector 30, reducing wear at this point.

[0083] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A power tool, characterized in that, include: The outer casing includes a housing and a head housing. The housing has an air outlet. A first part of the head housing is inserted into the housing. Along the length of the housing, the first part of the head housing is inserted at one end of the housing. An air inlet channel is provided at the overlap between the housing and the first part. The motor is located inside the housing; A fan is disposed inside the housing. The fan is used to draw outside air into the housing through the air inlet channel and exhaust it through the air outlet. The working head is located at the end of the head shell opposite to the machine housing and is connected to the motor drive.

2. The power tool according to claim 1, characterized in that, Along the axial direction of the motor, the air outlet is located at one end of the housing, the head shell is inserted at the other end of the housing, the motor is located between the air outlet and the air inlet channel, and the fan is arranged opposite to the air outlet.

3. The power tool according to claim 1, characterized in that, The outer wall of the first part is spaced apart from the inner wall of the housing, and at least one air inlet channel is formed between the first part and the housing; Alternatively, the housing may be provided with at least one of the aforementioned air inlet channels; Alternatively, the first part may be provided with at least one of the aforementioned air inlet channels.

4. The power tool according to claim 1, characterized in that, The power tool further includes an intermediate cover, which is installed in the first part and located inside the housing. The intermediate cover has a through hole. The power tool also includes a transmission assembly, a portion of which is located within the through hole. The motor is connected to the working head via the transmission assembly. The intermediate cover and / or the head shell are metal parts.

5. The power tool according to any one of claims 1 to 4, characterized in that, The power tool also includes: handle; Rigid connectors with an integrated structure; A plurality of first elastic bodies are provided, the plurality of first elastic bodies being spaced apart along the length direction of the rigid connector, and the rigid connector being connected to the outer shell through the first elastic bodies; A plurality of second elastic bodies are provided, the plurality of second elastic bodies being spaced apart along the length direction of the rigid connector, and the rigid connector being connected to the handle via the second elastic bodies; Fastening assembly for securing the housing to the handle.

6. The power tool according to claim 5, characterized in that, The rigid connector has two first through holes and two second through holes. Along the length of the rigid connector, the two first through holes are located between the two second through holes. The fastening assembly includes two first fasteners and two second fasteners. The two first fasteners are respectively inserted through the two first through holes. The first fasteners fasten the outer shell to the handle. The two second fasteners are respectively inserted through the two second through holes. The second fasteners fasten the outer shell to the handle. The first elastic body is sleeved on the first fastener and located between the outer shell and the rigid connector. The second elastic body is sleeved on the second fastener and located between the rigid connector and the handle.

7. The power tool according to claim 6, characterized in that, The outer surface of the housing has two protruding lugs. There are two rigid connectors, which are arranged opposite to each other. The lugs are located between the two rigid connectors. The two rigid connectors on both sides of the lugs are connected to the lugs through a plurality of first elastic bodies. The two rigid connectors on both sides of the lugs are connected to the handle through a plurality of second elastic bodies. The first fastener passes through the two oppositely arranged rigid connectors, and the second fastener passes through the two oppositely arranged rigid connectors.

8. The power tool according to claim 7, characterized in that, The two lugs are respectively connected to the housing and the head shell. The rigid connector also has a third through hole. Along the length of the rigid connector, the third through hole is located between the two first through holes and between the two lugs. The fastening assembly also includes a third fastener, which passes through the third through hole and fastens the housing to the handle.

9. The power tool according to claim 8, characterized in that, The handle includes a housing with a receiving cavity formed therein. The lug, the rigid connector, the first elastic body, and the second elastic body are all disposed within the receiving cavity. The handle also includes two connecting posts located within the receiving cavity. One end of each connecting post is connected to the inner wall of the housing. The two connecting posts are coaxially disposed with the two second fasteners, respectively. The connecting posts pass through the second through hole and the second elastic body, and a portion of the second fastener is inserted into the connecting post.

10. The power tool according to claim 9, characterized in that, On opposite sides of the lug, there is a first groove, which communicates with the first through hole. The first elastic body is installed in the first groove, and a portion of the first elastic body protrudes from the first groove. In the two rigid connectors arranged opposite to each other, one of the rigid connectors has a second groove on the side facing away from the other rigid connector. The second groove communicates with the second through hole. The second elastic body is installed in the second groove, and a portion of the second elastic body protrudes from the second groove.

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