Casing and electric handheld tool

Abstract

The utility model discloses a machine shell and an electric handheld tool, and relates to the technical field of electric tools. The machine shell comprises a first shell body, a second shell body and a machine shell oil seal, and the first shell body and the second shell body are structurally matched and connected with each other so as to define a containing cavity. The first shell is provided with two installation grooves. The machine shell oil seal comprises oil seal strips arranged in the installation grooves. The second shell is provided with a first convex rib, and the first convex rib is opposite to and matched with the mounting groove in position; a second convex rib is convexly arranged on the surface of one side, facing the mounting groove, of the first convex rib, and the width of the second convex rib is smaller than that of the first convex rib; when the second shell and the first shell are assembled, the first convex rib and the second convex rib can be clamped in the mounting groove and abut against the machine shell oil seal. According to the machine shell, the sealing performance of the machine shell can be improved, the oil leakage probability is reduced, and the reliability and safety of the electric handheld tool are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to electric tool technical field, specifically, a kind of machine shell and electric hand-held tool. BACKGROUND

[0002] In modern life, electric hand-held tool plays extremely important role and has been widely applied, for example, electric hammer, electric drill etc., greatly improve people's life quality and improve work efficiency. In order to improve the safety and reliability of electric hand-held tool, the shell of electric hand-held tool is usually provided with lubricating oil, which can form a continuous oil film on the surface of moving parts inside the shell, effectively reduce the direct friction between parts, thereby prolonging the service life of moving parts.

[0003] The existing electric hand-held tool usually adopts interference fit of machine shell oil seal and machine shell sealing rib to seal the lubricating oil in the shell, and the internal temperature of electric tool changes greatly during use, and the high-speed movement of the driving mechanism makes the grease easy to leak after liquefaction, and the sealing scheme of the existing electric tool is not ideal in actual performance. SUMMARY

[0004] The utility model aims at providing a kind of machine shell and electric hand-held tool, which can improve the sealing property of machine shell, and further improve the use reliability and safety of electric hand-held tool.

[0005] The embodiment of the utility model is realized as follows:

[0006] In one aspect of the utility model, a machine shell is provided, comprising a first shell, a second shell and a machine shell oil seal, the first shell and the second shell are structurally matched and connected to each other to form a containing cavity; the first shell is provided with a mounting groove, the machine shell oil seal comprises an oil seal strip arranged in the mounting groove, and the second shell is provided with a first rib, the first rib is opposite to the mounting groove in position and is matched; a second rib is protruded on the surface of the first rib towards the mounting groove, and the width of the second rib is smaller than that of the first rib; when the second shell is assembled with the first shell, the first rib and the second rib can be clamped in the mounting groove and abut against the machine shell oil seal.

[0007] Optionally, the ratio of the end face width of the second rib away from the mounting groove to the end face width of the first rib away from the second rib is less than or equal to 0.5 and greater than or equal to 0.08.

[0008] Optionally, the ratio of the thickness of the second rib to the thickness of the first rib is less than or equal to 0.4 and greater than or equal to 0.05, and the thickness direction is the same as the groove depth direction of the mounting groove.

[0009] Optionally, the length of the second rib is less than or equal to the length of the first rib.

[0010] Optionally, the second protruding rib is trapezoidal in cross section along the thickness direction, and the thickness direction is in the same direction as the groove depth direction of the mounting groove.

[0011] Optionally, when the first protruding rib and the second protruding rib are clamped in the mounting groove and abut against the oil seal strip, the overall thickness of the oil seal strip, the first protruding rib and the second protruding rib in the groove depth direction of the mounting groove is greater than or equal to the depth of the mounting groove.

[0012] Optionally, an edge of the assembly surface of one of the first shell and the second shell is provided with an assembly rib, and an edge of the assembly surface of the other of the first shell and the second shell is provided with a clamping groove corresponding to the assembly rib, the assembly rib being capable of being clamped in the clamping groove to enable the first shell and the second shell to be clamped.

[0013] Optionally, in the radial direction of the accommodating cavity, the clamping groove is located outside the mounting groove.

[0014] Optionally, the accommodating cavity comprises a first cavity and a second cavity in communication, and the oil seal further comprises a first oil seal ring and a second oil seal ring, the first oil seal ring and the second oil seal ring being arranged at two ends of the second cavity in the extension direction of the oil seal strip.

[0015] In another aspect, the utility model provides a kind of electric hand-held tools, including output head, starting switch, motor, transmission assembly and machine shell, motor and transmission assembly are arranged in the accommodating cavity of machine shell, motor and transmission assembly are transmission connection;Output head is arranged at the end of machine shell and is transmission connection with transmission assembly;Starting switch is arranged in machine shell and is electrically connected with motor.

[0016] Optionally, the electric hand-held tool further comprises a shift knob arranged on the outer wall of the machine shell, and the shift knob is electrically connected with the starting switch and the motor, respectively.

[0017] The beneficial effects of the utility model include at least one of the following:

[0018] The application provides a machine shell, comprising a first shell, a second shell and a machine shell oil seal, the first shell and the second shell are structurally matched and connected with each other to form an accommodation cavity; the first shell is provided with a mounting groove, and the machine shell oil seal comprises an oil seal strip arranged in the mounting groove; through the arrangement of the machine shell oil seal, a sealing effect can be achieved to prevent the leakage of machine oil in the accommodation cavity and prevent foreign matters from entering the accommodation cavity, thereby ensuring the stability of the internal environment; the second shell is provided with a first protruding rib, the first protruding rib is opposite to the mounting groove and is matched with the mounting groove; a second protruding rib is arranged on the surface of the first protruding rib facing the mounting groove, and the width of the second protruding rib is smaller than that of the first protruding rib; when the second shell is assembled with the first shell, the first protruding rib and the second protruding rib can be clamped in the mounting groove and abut against the machine shell oil seal; through the arrangement of the first protruding rib and the second protruding rib, the first protruding rib and the second protruding rib can play a role in positioning and guiding when the first shell and the second shell are assembled, and the tightness of the sealing can be improved; since the width of the second protruding rib is smaller than that of the first protruding rib, when the first protruding rib and the second protruding rib abut against the machine shell oil seal, the contact area with the machine shell oil seal is larger, and the oil leakage prevention effect is greatly improved; the machine shell can improve the sealing performance of the machine shell, reduce the oil leakage probability, and thus improve the use reliability and safety of the electric hand tool.

[0019] The application also provides an electric hand tool, comprising an output head, a starting switch, a motor, a transmission assembly and a machine shell, the motor and the transmission assembly are arranged in an accommodation cavity of the machine shell and are transmissionally connected; the output head is arranged at an end of the machine shell and is transmissionally connected with the transmission assembly and is used for clamping a working head; the starting switch is arranged on an outer wall of the machine shell and is electrically connected with the motor; through the arrangement of the machine shell with excellent sealing performance, the oil leakage probability of the electric hand tool can be reduced, and thus the use reliability and safety of the electric hand tool are improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0021] Figure 1 The structural schematic diagram of the first shell of the machine shell provided by the embodiments of the present application is shown in the figure;

[0022] Figure 2 The structural schematic diagram of the second shell of the machine shell provided by the embodiments of the present application is shown in the figure;

[0023] Figure 3 The structural schematic diagram of the machine shell oil seal of the machine shell provided by the embodiments of the present application is shown in the figure;

[0024] Figure 4 is a detail enlargement of A;

[0025] Figure 5 is a detail enlargement of B;

[0026] Figure 6 is a detail enlargement of C;

[0027] Figure 7 is a detail enlargement of D;

[0028] Figure 8 is an assembly schematic view of the first shell, the second shell and the shell oil seal provided by the embodiment of the utility model;

[0029] Figure 9 is a sectional view of the second shell provided by the embodiment of the utility model;

[0030] Figure 10 is a schematic view of the shell of the electric hand tool provided by the embodiment of the utility model. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. The components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the claimed utility model, but only represents selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the utility model.

[0033] It should be noted that: similar labels and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0034] In the description of the utility model, it needs to explain, the term "center", "upper", "lower", "left", "right", "vertical", "horizontal", "internal", "external" and so on indicate the orientation or position relation based on the orientation or position relation shown in the drawing, or it is the orientation or position relation that the utility model product uses usually, only for the convenience of describing the utility model and simplifying the description, and not indicate or imply that the indicated device or element must have a particular orientation, construct and operate, therefore, it cannot be understood as the limitation of the utility model. In addition, the terms "first", "second", "third" and so on are only used for distinguishing description, and cannot be understood as indicating or implying relative importance.

[0035] In addition, the terms "horizontal", "vertical" and so on do not mean that the component must be absolutely horizontal or overhanging, but can be slightly inclined. As "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0036] In the description of the utility model, it also needs to explain that, unless otherwise expressly provided and limited, the terms "set", "install", "connect", "connect" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or indirectly connected through an intermediate medium, it can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0037] Please refer to Figure 1 , Figure 2 And Figure 3 , the embodiment provides a casing 100, which comprises a first shell 110, a second shell 120 and a casing oil seal 130, the first shell 110 and the second shell 120 are connected with each other and are adapted to each other, so as to form a containing cavity 140. As shown in Figure 4 And Figure 5 , the first shell 110 is provided with a mounting groove 111, and the casing oil seal 130 comprises an oil seal strip arranged in the mounting groove 111. As shown in Figure 6 And Figure 7 , the second shell 120 is provided with a first rib 121, the first rib 121 is opposite to the mounting groove 111 and is adapted to the mounting groove 111. The surface of the first rib 121 towards the mounting groove 111 is provided with a second rib 122, and the width of the second rib 122 is less than the width of the first rib 121; when the second shell 120 is assembled with the first shell 110, the first rib 121 and the second rib 122 can be clamped in the mounting groove 111 and abut against the casing oil seal 130.

[0038] Specifically, the present application provides a casing 100, which mainly comprises a first shell 110, a second shell 120 and a casing oil seal 130. The first shell 110 and the second shell 120 serve as the main frame part of the casing 100, which builds the basic outline and support structure for the whole casing 100. The casing oil seal 130 plays a sealing role, which is indispensable for maintaining the stability of the internal environment of the casing and the normal operation of the related components.

[0039] As shown in Figure 1 and Figure 2 , the shape and size of the first shell 110 and the second shell 120 are matched with each other to ensure that they can be tightly connected as a whole. When the first shell 110 and the second shell 120 are connected, a containing cavity 140 can be formed, which can accommodate components such as motors, transmission assemblies, etc. The casing oil seal 130 is located at the assembly connection of the first shell 110 and the second shell 120, which prevents the lubricating oil in the containing cavity 140 from leaking.

[0040] As shown in Figure 3 , the casing oil seal 130 comprises an oil seal strip, which comprises a first oil seal strip 131 and a second oil seal strip 132. Correspondingly, as shown in Figure 4 and Figure 5 , the assembly surface of the first shell 110 is provided with two spaced installation grooves 111, which extend along the edge profile of the first shell 110; the first oil seal strip 131 and the second oil seal strip 132 can be respectively assembled in the two installation grooves 111 and tightly fit with the inner wall of the installation grooves 111.

[0041] In order to be able to clamp the first oil seal strip 131 and the second oil seal strip 132 in the installation grooves 111, as shown in Figure 6 and Figure 7 , the assembly surface of the second shell 120 is provided with a first protruding rib 121 and a second protruding rib 122 corresponding to the installation grooves 111. The length of the first protruding rib 121 is equal to the length of the installation grooves 111, the second protruding rib 122 is arranged on the side of the first protruding rib 121 facing the installation grooves 111, and the width of the second protruding rib 122 is smaller than the width of the first protruding rib 121, so that the first protruding rib 121 and the second protruding rib 122 form a stepped structure.

[0042] As shown in Figure 8 , when the second shell 120 is assembled with the first shell 110, the first protruding rib 121 and the second protruding rib 122 can be clamped in the installation grooves 111 and abut against the casing oil seal 130, so as to tightly press the first oil seal strip 131 and the second oil seal strip 132 in the installation grooves 111 through interference fit.

[0043] The applicant finds that, since the existing shell is usually only provided with the first protruding rib capable of being assembled with the mounting groove, and the end face of the first protruding rib towards the side of the mounting groove is a plane, the contact surface of the shell oil seal and the protruding rib is only one contact surface, the effective sealing area is small, the contact surface is not bent, and the lubricating oil may leak through only one contact surface. However, the second protruding rib 122 is arranged on the surface of the first protruding rib 121, and the width of the second protruding rib 122 is smaller than that of the first protruding rib 121. Therefore, when the first protruding rib 121 and the second protruding rib 122 are clamped in the mounting groove 111 and abut against the shell oil seal 130, the first protruding rib 121 has two contact surfaces capable of abutting against the shell oil seal 130, the second protruding rib 122 has three contact surfaces capable of abutting against the shell oil seal 130, and a plurality of bending angles are formed between the contact surfaces. Therefore, compared with the existing assembly structure, the effective sealing area of the shell oil seal 130 in the shell 100 of the present application and the first protruding rib 121 and the second protruding rib 122 is larger, and the plurality of bending angles formed between the contact surfaces greatly increase the difficulty of the lubricating oil passing through, thereby greatly improving the sealing performance of the shell 100, reducing the probability of oil leakage, preventing dust, water vapor, impurities and the like in the outside from entering the accommodating cavity 140, and ensuring that the components inside the shell 100 can stably and reliably operate. Moreover, the second protruding rib 122 is additionally arranged on the surface of the first protruding rib 121, without changing the existing layout of the shell 100, without increasing the parts, without increasing the production cost, without affecting the convenience of use and operation, and without increasing the risk of oil leakage of the shell 100 in the use process, which is a small change with great effect.

[0044] In order to ensure that the shell oil seal 130 achieves good sealing performance, and to adapt to the influence of assembly tolerance and deformation during assembly, in an embodiment of the present application, as shown in Figure 8 the ratio of the width of the end face of the second protruding rib 122 away from the mounting groove 111 to the width of the end face of the first protruding rib 121 away from the second protruding rib 122 is less than or equal to 0.5, and greater than or equal to 0.08. If the ratio is too small, the second protruding rib 122 may be too thin to apply sufficient pressure to the shell oil seal 130, and the contact area between the second protruding rib 122 and the shell oil seal 130 may be too small, thereby resulting in poor sealing effect. If the ratio is too large, the contact area between the first protruding rib 121 and the shell oil seal 130 may be too small, thereby resulting in poor sealing effect.

[0045] In order to ensure that the shell oil seal 130 achieves good sealing performance, and to adapt to the influence of assembly tolerance and deformation during assembly, in an embodiment of the present application, as shown in Figure 8As shown, the ratio of the thickness of the second rib 122 to the thickness of the first rib 121 is less than or equal to 0.4 and greater than or equal to 0.05, with the thickness direction 'a' being in the same direction as the groove depth of the mounting groove 111. If the ratio is too small, the second rib 122 may be too thin, thus failing to achieve the expected sealing effect; if the ratio is too large, the second rib 122 may be too thick, potentially causing excessive compression of the housing oil seal 130 during assembly, leading to localized excessive deformation of the oil seal and thus reducing sealing performance.

[0046] In one possible embodiment of this application, the length of the second rib 122 is less than or equal to the length of the first rib 121, which facilitates the forming of the second rib 122.

[0047] In one possible implementation of this application, such as Figure 9 As shown, the cross-section of the second rib 122 along the thickness direction a is trapezoidal; the thickness direction a is in the same direction as the groove depth direction of the mounting groove 111. The trapezoidal shape helps to distribute the pressure more evenly on the housing oil seal 130, so that the oil seal is subjected to relatively uniform pressure across the entire contact surface. This ensures that all parts of the oil seal can perform a good sealing function, prevents leakage problems caused by poor local sealing, and improves the reliability and stability of the seal; at the same time, it can also increase the contact area between the second rib 122 and the housing oil seal 130, further improving the sealing performance.

[0048] The casing 100 comprises a first casing body 110, a second casing body 120 and a casing oil seal 130. The first casing body 110 and the second casing body 120 are structurally matched and connected to each other to form a containing cavity 140. The first casing body 110 is provided with a mounting groove 111, and the casing oil seal 130 comprises an oil seal strip arranged in the mounting groove 111. The casing oil seal 130 can play a sealing role, prevent the leakage of engine oil in the containing cavity 140, and also prevent foreign matters from entering the containing cavity 140, thereby ensuring the stability of the internal environment. The second casing body 120 is provided with a first protruding rib 121 which is opposite to the mounting groove 111 and matched with the mounting groove 111. The surface of the first protruding rib 121 towards the mounting groove 111 is provided with a second protruding rib 122, and the width of the second protruding rib 122 is smaller than that of the first protruding rib 121. When the second casing body 120 is assembled with the first casing body 110, the first protruding rib 121 and the second protruding rib 122 can be clamped in the mounting groove 111 and abut against the casing oil seal 130. The first protruding rib 121 and the second protruding rib 122 can play a role of positioning and guiding when the first casing body 110 and the second casing body 120 are assembled, and can also help to improve the tightness of the seal. Since the width of the second protruding rib 122 is smaller than that of the first protruding rib 121, when the first protruding rib 121 and the second protruding rib 122 abut against the casing oil seal 130, the contact surface with the casing oil seal 130 is larger, which greatly improves the oil leakage prevention effect. The casing 100 can improve the sealing performance of the casing 100, reduce the probability of oil leakage, and further improve the reliability and safety of the electric hand tool.

[0049] As shown in FIG. 1, Figure 8 When the first protruding rib 121 and the second protruding rib 122 are clamped in the mounting groove 111 and abut against the first oil seal strip 131, in the groove depth direction of the mounting groove 111, the thickness of the whole formed by the first oil seal strip 131, the first protruding rib 121 and the second protruding rib 122 is greater than or equal to the depth of the mounting groove 111. Similarly, when the first protruding rib 121 and the second protruding rib 122 are clamped in the mounting groove 111 and abut against the second oil seal strip 132, in the groove depth direction of the mounting groove 111, the thickness of the whole formed by the second oil seal strip 132, the first protruding rib 121 and the second protruding rib 122 is greater than or equal to the depth of the mounting groove 111. The groove depth direction of the mounting groove 111 is the same as the thickness direction a.

[0050] Specifically, in order to improve the sealing performance of the casing 100, as shown in FIG. 1, Figure 8 When the first protruding rib 121 and the second protruding rib 122 are arranged in the mounting groove 111, they can press the first oil seal strip 131 or the second oil seal strip 132, so that the first oil seal strip 131 or the second oil seal strip 132 is compressed and deformed, and the interference fit between the first protruding rib 121 and the second protruding rib 122 and the casing oil seal 130 is achieved.

[0051] When the first protruding rib 121 and the second protruding rib 122 are jointly clamped into the mounting groove 111 and abut against the first oil seal strip 131 or the second oil seal strip 132, the thickness of the whole formed by the three is greater than or equal to the depth of the mounting groove 111, and the whole formed by the first protruding rib 121, the second protruding rib 122 and the seal strip is in interference fit with the mounting groove 111, which makes the whole assembly compact and stable, ensuring the reliability and stability of the sealing performance.

[0052] In an embodiment of the present application, as shown in Figure 4 and Figure 5 , the edge of the assembly surface of the first shell 110 is provided with an assembly rib 112, as shown in Figure 6 and Figure 7 , the edge of the assembly surface of the second shell 120 is provided with a clamping groove 123 corresponding to the assembly rib 112, and the assembly rib 112 can be clamped in the clamping groove 123 to enable the clamping of the first shell 110 and the second shell 120. In the radial direction of the accommodating cavity 140, the clamping groove 123 is located outside the mounting groove 111, and the structural layout is reasonable.

[0053] Specifically, in order to further improve the assembly stability of the first shell 110 and the second shell 120, in addition to the clamping of the first protruding rib 121 and the second protruding rib 122 in the mounting groove 111, as shown in Figure 4 and Figure 5 , the edge of the assembly surface of the first shell 110 is further provided with an assembly rib 112, and correspondingly, as shown in Figure 6 and Figure 7 , the edge of the assembly surface of the second shell 120 is provided with a clamping groove 123 corresponding to the assembly rib 112, and the clamping of the clamping groove 123 and the assembly rib 112 can further improve the connection stability of the first shell 110 and the second shell 120, and also can further improve the sealing performance of the accommodating cavity 140 of the first shell 110 and the second shell 120.

[0054] It should be noted that in addition to the above-mentioned arrangement of the assembly rib 112 on the assembly surface of the first shell 110 and the corresponding arrangement of the clamping groove 123 on the assembly surface of the second shell 120, the clamping groove 123 can also be arranged on the assembly surface of the first shell 110 and the assembly rib 112 can be arranged on the assembly surface of the second shell 120. The present application does not limit the specific arrangement position of the assembly rib 112 and the clamping groove 123, as long as the stable connection of the first shell 110 and the second shell 120 through the clamping groove 123 and the assembly rib 112 can be ensured.

[0055] For example, as shown in Figure 1As shown, the accommodating cavity 140 comprises a first cavity 141 and a second cavity 142 which are in communication; the casing oil seal 130 further comprises a first oil seal ring 133 and a second oil seal ring 134, the first oil seal ring 133 and the second oil seal ring 134 are arranged at two ends of the second cavity 142 along the extension direction of the oil seal strip.

[0056] Specifically, the accommodating cavity 140 is divided into the first cavity 141 and the second cavity 142 according to different components accommodated, and the first cavity 141 and the second cavity 142 are in communication with each other. The first cavity 141 can be used for accommodating the motor of the electric hand tool, and the second cavity 142 can be used for accommodating the transmission assembly of the electric hand tool. The arrangement of the first cavity 141 and the second cavity 142 can provide good heat dissipation conditions and an orderly assembly environment for the electronic components inside the casing 100, and ensure that the whole system can operate stably and efficiently.

[0057] In order to improve the sealing performance of the second cavity 142, as shown, Figure 3 As shown, the casing oil seal 130 further comprises a first oil seal ring 133 and a second oil seal ring 134, the first oil seal ring 133 and the second oil seal ring 134 are arranged at two ends of the second cavity 142 along the extension direction of the first oil seal strip 131 and the second oil seal strip 132.

[0058] As shown, Figure 3 The first oil seal strip 131 and the second oil seal strip 132 are connected to the first oil seal ring 133 and the second oil seal ring 134, so that the first oil seal strip 131, the second oil seal strip 132, the first oil seal ring 133 and the second oil seal ring 134 are connected together to form an integral whole, which further improves the sealing performance of the casing oil seal 130, and also provides additional support for the first oil seal ring 133 and the second oil seal ring 134.

[0059] In another aspect, the utility model provides a kind of electric hand tool, as shown, Figure 10 As shown, comprising output head 210, start switch 220, motor, transmission assembly and casing 100, motor and transmission assembly are arranged in the accommodating cavity 140 of casing 100, and motor and transmission assembly are drivingly connected;Output head 210 is arranged at the end of casing 100 and is drivingly connected with transmission assembly, and output head 210 can be used for clamping work head;Start switch 220 is arranged in casing 100 and is electrically connected with motor.

[0060] Specifically, the electric hand tool comprises the above-mentioned casing 100, and the motor and the transmission assembly are arranged in the accommodating cavity 140 of the casing 100, as shown, Figure 10As shown, one end of the casing 100 is provided with a port for mounting the output head 210, the output head 210 is in driving connection with the transmission assembly, and the transmission assembly is in driving connection with the motor; the end of the output head 210 can clamp various types of working heads to meet different working requirements and improve the use flexibility of the motor handheld tool. The operator can drive the motor to operate by starting the switch 220, and the motor can drive the working head clamped by the output head 210 to work. The specific structure of the casing 100 and the beneficial effects have been described in detail above, and will not be repeated here.

[0061] The above-mentioned electric handheld tool can reduce the probability of oil leakage by the setting of the casing 100 with excellent sealing performance, thereby improving the use reliability and safety of the electric handheld tool.

[0062] Optionally, as shown, Figure 10 As shown, the electric handheld tool further comprises a gear shift knob arranged on the outer wall of the casing 100, the gear shift knob 230 cooperates with the transmission mechanism to realize the switching of the function mode. The electric handheld tool of the embodiment is an electric hammer, and the gear shift knob 230 can realize the switching of the modes of drilling, hammering, impact drilling, etc., which can enrich the use scenarios of the electric handheld tool, greatly enrich the functions and operation flexibility of the electric handheld tool, so that the user can easily adjust the working state of the tool according to the actual working requirements, and improve the working efficiency and quality.

[0063] The above-mentioned is only an optional embodiment of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

[0064] In addition, it should be noted that each specific technical feature described in the above specific embodiments can be combined in any appropriate manner without contradiction, and in order to avoid unnecessary repetition, the present application will not further describe various possible combination manners.

Claims

1. A housing, characterized by The first shell and the second shell are structurally adapted and connected to each other to form a containing cavity; the first shell is provided with a mounting groove, and the casing oil seal comprises an oil seal strip arranged in the mounting groove; the second shell is provided with a first protruding rib, which is opposite to the mounting groove in position and is adapted; a surface of the first protruding rib on a side facing the mounting groove is provided with a second protruding rib, and the width of the second protruding rib is smaller than that of the first protruding rib; when the second shell is assembled with the first shell, the first protruding rib and the second protruding rib can be clamped in the mounting groove and abut against the casing oil seal.

2. The enclosure of claim 1, wherein, The ratio of the end face width of the second protruding rib on a side away from the mounting groove to the end face width of the first protruding rib on a side away from the second protruding rib is less than or equal to 0.5 and greater than or equal to 0.

08.

3. The enclosure of claim 1 or 2, wherein, The ratio of the thickness of the second protruding rib to the thickness of the first protruding rib is less than or equal to 0.4 and greater than or equal to 0.05, and the thickness direction is the same as the groove depth direction of the mounting groove.

4. The enclosure of claim 1, wherein, The length of the second protruding rib is less than or equal to the length of the first protruding rib.

5. The enclosure of claim 1, wherein, The cross section of the second protruding rib in the thickness direction is trapezoidal, and the thickness direction is the same as the groove depth direction of the mounting groove.

6. The enclosure of claim 1, wherein, When the first protruding rib and the second protruding rib are clamped in the mounting groove and abut against the oil seal strip, the thickness of the whole formed by the oil seal strip, the first protruding rib and the second protruding rib in the groove depth direction of the mounting groove is greater than or equal to the depth of the mounting groove.

7. The enclosure of claim 1, wherein, The edge of the assembly surface of one of the first shell and the second shell is provided with an assembly rib, and the edge of the assembly surface of the other of the first shell and the second shell is provided with a clamping groove corresponding to the assembly rib, and the assembly rib can be clamped in the clamping groove to enable the clamping of the first shell and the second shell.

8. The enclosure of claim 7, wherein, In the radial direction of the containing cavity, the clamping groove is located outside the mounting groove.

9. The enclosure of claim 1, wherein, The containing cavity comprises a first cavity and a second cavity connected in communication; the casing oil seal further comprises a first oil seal ring and a second oil seal ring, which are arranged at two ends of the second cavity in the extension direction of the oil seal strip.

10. An electric hand-held tool, characterized in that The output head, the start switch, the motor, the transmission assembly and the casing of any one of claims 1-9 are provided, the motor and the transmission assembly are arranged in the containing cavity of the casing, and the motor and the transmission assembly are transmission connected; the output head is arranged at the end of the casing and is transmission connected with the transmission assembly; and the start switch is arranged on the casing and is electrically connected with the motor.

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