A power tool

Abstract

The application discloses an electric tool, comprising a main body, a handle and a fastener, the main body comprises a shell, the shell is provided with a motor and an output shaft driven by the motor; the handle comprises a holding part and a connecting part, the holding part and the connecting part are integrally formed, the connecting part is made of flexible material and is connected with the shell; the fastener is used for connecting and fixing the main body and the handle; wherein the connecting part is configured to be able to absorb at least part of impact vibration transmitted to the shell by the output shaft through its flexible deformation during the working process of the electric tool, so as to reduce the impact transmitted to the handle. The electric tool of the application effectively reduces the impact and vibration transmitted to the operator's hand, thereby improving the operation comfort, reducing fatigue, and improving the control and safety of the tool.

Description

Technical Field

[0001] This application relates to the field of power tool technology, and more specifically, to a power tool with a vibration damping structure. Background Technology

[0002] Power tools are a class of tools that use an electric motor to drive working parts (such as drill bits, grinding wheels, saw blades, fastener output shafts, etc.) to complete machining operations. They are widely used in construction, decoration, manufacturing, repair and other fields. Their working principle is that the electric motor converts electrical energy into mechanical energy, driving the tool head to rotate, impact or reciprocate.

[0003] However, during the operation of many high-power or impact power tools (such as electric wrenches, electric hammers, electric picks, angle grinders, etc.), the motor drive mechanism and tool head generate strong vibrations, reaction forces, and impacts. These vibrations mainly originate from two aspects: first, the unbalanced force generated by the motor itself during operation; and second, the reaction force generated by the interaction between the tool head and the workpiece, such as the instantaneous reverse impact torque generated by the impact mechanism, the jamming vibration when the drill bit encounters resistance, and the frictional vibration between the grinding wheel and the workpiece. These vibrations and impact forces are transmitted to the outer casing through the main structure of the tool.

[0004] Traditional power tools typically use a rigid connection or a simple direct connection between the handle and the body housing. This structure allows vibrations and impacts generated during tool operation to be transmitted directly to the operator's hand and arm with almost no attenuation.

[0005] Prolonged exposure to such high-intensity vibration can cause numerous health hazards to operators, including but not limited to hand fatigue, muscle soreness, and impaired blood circulation, and significantly increases the risk of vibration syndromes such as vibration white finger disease (an occupational Raynaud's phenomenon). Furthermore, severe vibration can reduce the operator's precision and stability in tool control, affecting processing quality, and may even lead to safety accidents due to sudden loss of control.

[0006] Therefore, there is an urgent need in this field for a high-efficiency vibration reduction solution that is structurally sound, reliable in performance, and widely applicable to a variety of power tools. This solution can effectively attenuate multi-directional impacts and vibrations along the transmission path, thereby improving human-machine efficiency and ensuring operator health and safety. Utility Model Content

[0007] In view of this, this application provides an electric tool that effectively reduces the vibration transmitted to the handle during the operation of the electric tool.

[0008] This application provides an electric tool, comprising: The main body includes a housing, the housing being connected to a motor and an output shaft driven by the motor; The handle includes a grip portion and a connecting portion, the grip portion and the connecting portion being an integrally molded structure, the connecting portion being made of a flexible material and connected to the housing; Fasteners for connecting and securing the body and handle; The connecting portion is configured to absorb at least part of the impact vibration transmitted from the output shaft to the housing through its flexible deformation during the operation of the power tool, thereby reducing the impact transmitted to the handle.

[0009] By adopting the above technical solution, the flexible connecting part integrally molded on the handle is used as a vibration damping element to directly absorb and attenuate the impact energy from the shell along the structural transmission path. The structure is compact and efficient, and no additional complex vibration damping parts are required, thus achieving a fundamental improvement in suppression from the vibration source.

[0010] This solution integrates the connecting part and the grip part into a single unit. First, it eliminates assembly gaps and friction points between parts, making the vibration damping structure an integral part of the handle, with a lifespan consistent with the tool body, greatly improving the long-term reliability of the entire tool under harsh working conditions. Second, by integrating the vibration damping function into the handle, manufacturing is completed in one step, eliminating additional parts and subsequent assembly steps, simplifying supply chain management and production processes, and significantly reducing material and assembly costs. Third, it ensures a seamless connection between the flexible connecting part and the handle body, with a clear force transmission path. The deformation behavior and vibration damping performance of the flexible material are highly consistent across every product, guaranteeing product quality stability and the reliability of the vibration damping effect. Fourth, by embedding the vibration damping function within the connecting structure, no additional space is required, making the tool structure more compact.

[0011] In some embodiments, the connecting portion includes a first connecting portion disposed inside the grip portion, the first connecting portion being used to attenuate vibration of the housing in a first direction, the first direction being a radial direction perpendicular to the fastener axis.

[0012] By adopting the above technical solution, the built-in first connecting part not only provides the connecting function, but also absorbs radial vibration in the first direction mainly through the shearing or extrusion deformation of its material, thereby reducing the circumferential vibration of the fastener.

[0013] In some embodiments, the connecting portion includes a second connecting portion that at least covers the first end edge of the grip portion, the second connecting portion being used to dampen vibrations of the housing in a second direction, the second direction being the axial direction of the fastener.

[0014] By adopting the above technical solution, the first connecting part, as a flexible buffer strip located at the end, can effectively filter and weaken the main impact vibration in the axial direction of the fastener, reduce the lateral vibration impact of the handle, and achieve multi-dimensional vibration reduction in conjunction with the first connecting part.

[0015] In some implementations, the first direction and the second direction are perpendicular to each other.

[0016] By adopting the above technical solution, and by arranging the two vibration damping parts in mutually perpendicular directions, a multi-dimensional vibration damping system is formed, which can work together to cope with the complex multi-directional composite vibrations generated by the tool during operation, and significantly improve the overall vibration damping effect.

[0017] In some embodiments, the housing includes a connecting hole or a connecting post, the gripping part is provided with a connecting post or a connecting hole corresponding to the housing, and the first connecting part is disposed on the outer surface of the connecting post or the inner surface of the connecting hole of the gripping part and is connected to the connecting hole or connecting post on the housing.

[0018] By adopting the above technical solution, this design cleverly integrates vibration reduction function with mechanical connection structure. The connecting post / hole wrapped by the first connecting part (flexible material) provides the necessary connection strength when it mates with the shell, and dissipates vibration energy through the compression deformation of the material in the hole or the shear extrusion deformation of the post surface. The design is simple and the structure is stable.

[0019] In some embodiments, the outer surface of the connecting post or the inner surface of the connecting hole on the gripping part is provided with an anti-detachment structure to enhance the bonding strength between the first connecting part and the connecting post or connecting hole, and to prevent the connecting part from detaching from the connecting post or connecting hole on the gripping part.

[0020] By adopting the above technical solution, the mechanical bonding strength and connection reliability between the first connecting part made of flexible material and the rigid gripping body are significantly enhanced, preventing interface peeling or detachment due to material fatigue or stress concentration under high-frequency vibration and impact conditions. This ensures the durability and stability of the vibration damping function, avoiding a decrease or failure in vibration damping performance due to loosening of the first connecting part, thereby maintaining the long-term vibration suppression effect and operational safety of the power tool. This structure is easy to realize through a one-piece molding process, effectively improving the durability of key connection interfaces and the overall quality of the product without excessively increasing manufacturing difficulty.

[0021] In some embodiments, the fastener is connected to the housing through the grip and the first connection portion.

[0022] By adopting the above technical solution, the fastener directly penetrates the flexible first connection, providing the most direct and robust mechanical connection, ensuring structural integrity under high torque loads, while the flexible material can still perform its vibration damping function. The fastener, as the main load-bearing component, bears most of the tensile and shear forces, while the flexible connection surrounding it mainly plays a role in vibration damping and buffering. This division of labor clearly defines the force transmission path, ensuring both the absolute strength of the connection and not affecting the absorption efficiency of the flexible material for high-frequency impact vibrations.

[0023] In some embodiments, the fastener is spaced apart from the first connecting portion and passes through the grip portion to connect to the housing.

[0024] By adopting the above technical solution, the fastening point and the flexible connection point of the first connection part are arranged separately, which can reduce the constraint of the fastener on the deformation behavior of the flexible material, allow the first connection part to generate greater deformation to absorb more impact energy, and optimize the vibration reduction performance.

[0025] In some embodiments, the connection portion further includes a third connection portion that covers at least the edge of the second end of the grip portion, the second end being connected to the battery pack via the third connection portion.

[0026] By adopting the above technical solution, the third connection part forms vibration isolation at the battery pack interface, which not only further reduces the vibration transmitted to the handle, but also reduces the direct impact on the battery pack, effectively extending the service life of the battery pack and improving the connection reliability.

[0027] In some embodiments, the second or third connecting portion further includes an anti-slip connecting portion covering at least a portion of the middle area of ​​the outer surface of the grip portion to enhance the friction and grip comfort of the grip portion.

[0028] By adopting the above technical solution, the first or third connecting part extends to the gripping area while reducing vibration, increasing the surface friction coefficient to prevent slipping. Its soft texture also directly improves the user's hand comfort, achieving a unity of function and user experience.

[0029] In summary, this application has at least one of the following beneficial technical effects: 1. Highly efficient multi-dimensional vibration reduction, improving comfort and health protection: The integrated flexible connection (such as the first and second connection) creates an efficient energy dissipation path, which can effectively attenuate vibrations in different directions (such as axial and radial), significantly reducing the impact and vibration transmitted to the operator's hands from the source, greatly improving operating comfort, and effectively reducing occupational health risks such as vibration-induced white finger disease caused by long-term use.

[0030] 2. Innovative Structural Integration, Balancing Reliability and Cost: The vibration damping function is integrated with the key mechanical structure into a single unit, eliminating the need for additional complex vibration damping components, simplifying the assembly process, and reducing costs. Simultaneously, through the rational arrangement of anti-detachment structures and fasteners, excellent vibration damping performance is achieved while ensuring the overall structural connection strength and long-term reliability.

[0031] 3. Functional expansion and comprehensive performance optimization: The flexible covering layer extending from the first or second connecting part (such as covering the grip area and battery pack interface) not only reduces vibration but also improves grip stability, operating feel and protection of key components (battery pack). This reflects the comprehensive design of ergonomics and tool reliability, and enhances the overall market competitiveness of the product. Attached Figure Description

[0032] Figure 1 This is a structural schematic diagram of the first embodiment of the power tool of this application; Figure 2 This is an exploded structural diagram of the first embodiment of the power tool of this application; Figure 3 This is another exploded view of the first embodiment of the power tool of this application; Figure 4 yes Figure 3 Enlarged diagram of area A in the middle; Figure 5 This is a schematic diagram of the handle of the power tool according to the first embodiment of this application; Figure 6 This is a schematic diagram of the disassembled mechanism of the handle of the power tool according to the first embodiment of this application; Figure 7 This is a schematic diagram showing the separation of the connecting part and the gripping part in the first embodiment of the power tool of this application; Figure 8 This is a front structural schematic diagram of the first embodiment of the power tool of this application; Figure 9 This is a schematic diagram of the three-dimensional cross-sectional structure of the power tool according to the first embodiment of this application; Figure 10 yes Figure 8 A magnified diagram of area A in the middle; Figure 11 This is a schematic diagram of the structure of the power tool according to the second embodiment of this application; Figure 12 This is a structural schematic diagram of the third embodiment of the power tool of this application; Figure 13 This is a structural schematic diagram of the fourth embodiment of the power tool of this application; Figure 14 This is a schematic diagram of the fourth embodiment of the power tool of this application and its battery pack assembly state.

[0033] Figure label:

[0034] 1. Main body; 11. Output shaft; 12. Housing; 121. Connecting hole; 13. Motor; 2. Handle; 21. Left grip; 22. Right grip; 23. Connecting post; 24. First connecting part; 25. Anti-detachment structure; 26. Second connecting part; 27. Third connecting part; 28. Anti-slip connecting part; 291. First end; 292. Second end; 3. Screw. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the utility model will be further described in detail below with reference to the accompanying drawings. The components of the embodiments of this utility model described and shown in the accompanying drawings can be arranged and designed in various different configurations. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0036] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0037] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0038] In the description of this application, it should be understood that the terms "upper", "lower", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0039] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings. Unless otherwise specified, the features in the following embodiments can be combined with each other.

[0040] Example 1

[0041] Please see Figures 1-10This embodiment provides a power tool, specifically an electric wrench, which includes a main body 1, a handle 2, and fasteners. The main body 1 includes a housing 12, within which a motor 13 and an output shaft 11 driven by the motor 13 are disposed. The front end of the output shaft 11 has a square head for mounting a socket. The handle 2 includes a grip portion and a first connecting portion 24. The grip portion is made of rigid plastic (such as ABS or nylon fiber-reinforced material) and is integrally molded by injection molding, with a metal reinforcing skeleton embedded inside to improve overall strength. The first connecting portion 24 is made of flexible materials such as thermoplastic elastomer (TPE), rubber, or polyurethane (PU) and is integrally formed with the grip portion through a secondary injection molding (overmolding) process. There is no assembly interface between the two, resulting in extremely high connection reliability and durability.

[0042] The first connecting part 24 is configured to absorb at least part of the impact vibration transmitted from the output shaft 11 to the housing 12 through its flexible deformation during the operation of the power tool, so as to reduce the impact transmitted to the handle 2.

[0043] Please see Figures 1-7 In this embodiment, the handle 2 includes a left grip portion 21 and a right grip portion 22, which are connected and fixed together by fasteners, specifically screws 3. The connecting portion includes a first connecting portion 24 disposed inside the left grip portion 21 or the right grip portion 22, which is used to attenuate vibrations of the housing 12 in a first direction. Specifically, a plurality of spaced connecting posts 23 are integrally formed on the inner side of the left grip portion 21 or the right grip portion 22 where it connects to the housing 12. Correspondingly, a corresponding number of connecting holes 121 that mate with the connecting posts 23 are provided at the bottom of the housing 12. The first connecting portion 24 is disposed on the outer surface of the connecting posts 23 of the left grip portion 21 or the right grip portion 22, forming a complete flexible covering layer. During assembly, the connecting post 23, which covers the first connecting portion 24, is aligned and inserted into the connecting hole 121 of the housing 12 to form an interference fit. The first connecting post 23 on the left grip 21 and the first connecting portion 24 on the right grip 22 are mated together to clamp the housing 12 and fix it with screws 3. The flexible material of the first connecting portion 24 undergoes elastic deformation when subjected to radial compression, which can effectively absorb the vibration generated during tool operation. Alternatively, the grip can be provided with a connecting hole 121, the first connecting portion 24 can be provided in the connecting hole 121, and the housing 12 can be provided with a connecting post 23 that mates with the connecting hole 121.

[0044] Please see Figure 3 and Figure 4To further enhance the connection reliability of the first connecting part 24, an anti-detachment structure 25 is provided on the outer surface of the connecting post 23 on the gripping part. This structure enhances the bonding strength between the first connecting part 24 and the connecting post 23, preventing the first connecting part 24 from detaching from the connecting post 23. The anti-detachment structure 25 can be implemented in various ways: for example, an annular groove can be machined on the outer surface of the connecting post 23, allowing the covering flexible material to be embedded in the groove to form a mechanical interlock; or a rough texture or a raised dot array can be provided on the surface of the connecting post 23 to increase the bonding area and friction. In this embodiment, a gear-shaped outward-convex structure is used to achieve the anti-detachment effect of the first connecting part 24.

[0045] Please see Figures 8-10 Screw 3 is used to connect and secure the main body 1 and the handle 2. This arrangement provides two alternative solutions: in the first method, see [reference needed]. Figure 10 In the first method, the screw 3 passes through the gripping part and the first connecting part 24 and is connected to the housing 12. Specifically, the fastener passes through the through hole in the center of the connecting post 23 and is threaded to the housing 12. In the second method, the fastener is spaced apart from the first connecting part 24 and passes through the gripping part to connect to the housing 12. That is, the fastener is set on the side of the connecting post 23, avoiding the flexible connection area.

[0046] Vibration transmission and absorption process in this embodiment: Vibration generation: At the instant the impact mechanism operates, a huge reaction force is transmitted to the motor 13 mounting base through the gear transmission mechanism, which in turn causes strong vibration of the housing 12. These vibrations can be decomposed into two components: one is axial vibration along the axis of screw 3, and the other is radial vibration perpendicular to the axis of screw 3.

[0047] Radial vibration absorption: Radial vibration generated by the housing 12 is transmitted to the first connecting part 24 through the connecting hole 121. Since the first connecting part 24 completely covers the outer surface of the connecting post 23, forming a flexible bushing structure, when the vibration energy is transmitted to this point, the flexible material will undergo shear deformation and elastic deformation, converting the mechanical vibration energy into heat energy dissipation, thereby effectively attenuating radial vibration.

[0048] Connection reliability is ensured: The anti-detachment structure 25, located on the outer surface of the connecting post 23, ensures a firm connection between the first connecting part 24 and the connecting post 23. Even under long-term vibration conditions, the flexible material will not detach from the surface of the connecting post 23, maintaining stable vibration reduction performance.

[0049] Vibration isolation effect: After effective attenuation by the first connecting part 24, the remaining vibration energy is significantly reduced before it is transmitted to the grip. When the user holds the grip, the impact vibration felt is significantly reduced, thereby improving operating comfort and reducing hand fatigue and health risks caused by long-term work.

[0050] Example 2

[0051] Please refer to 11. This embodiment further optimizes the connection structure based on Embodiment 1.

[0052] The connecting portion further includes a second connecting portion 26 that covers at least the edges of the first ends 291 of the left and right grip portions. The second connecting portion 26 is used to dampen vibrations of the housing 12 in a second direction. In this embodiment, the second direction is the axial direction of the fastener. The second connecting portion 26 and the first connecting portion 24 are integrally formed from the same flexible material to form a complete edge-wrapping structure, covering the end face and surrounding area where the grip portion connects to the housing 12.

[0053] It is worth noting that the first and second directions are perpendicular to each other, corresponding to the attenuation requirements of radial and axial vibrations of screw 3, respectively. The first connecting part 24 mainly absorbs radial vibration through shear deformation of the material, while the second connecting part 26 mainly absorbs axial vibration through compressive deformation of the material. The two work together to form a multi-dimensional vibration reduction system.

[0054] Example 3

[0055] Please see Figure 12 and Figure 13 This embodiment further expands the functional scope of the connecting part based on the above embodiments.

[0056] The connecting portion also includes a third connecting portion 27 that covers at least the edges of the second ends 292 of the left and right grip portions, with the second ends 292 connected to the battery pack via the third connecting portion 27. The third connecting portion 27 is also made of a flexible material and integrally molded with the grip portion, forming a complete flexible edging at the battery pack interface. This structure not only attenuates vibrations transmitted to the battery pack, protecting the cells and circuits inside the battery pack, but also further reduces vibration energy transmitted to the user's hand.

[0057] The specific implementation of the third connecting part 27 includes: forming an annular flexible edging at the second end 292 of the grip, with a guide rail structure that cooperates with the battery pack slot on the inner side of the edging; or setting a flexible battery pack interface seat at the second end 292 of the grip, with conductive terminals embedded in the interface seat; or setting a full-circumferential flexible sealing ring at the connection between the battery pack and the handle 2, which serves both as a vibration damping function and as a dustproof and waterproof function.

[0058] Example 4

[0059] Please see Figure 14 The difference between this embodiment and embodiments two and three is that the structure of the second connecting part 26 and the third connecting part 27 has been further optimized.

[0060] The second connecting part 26 or the third connecting part 27 also includes an anti-slip connecting part 28 covering at least a portion of the middle area of ​​the outer surfaces of the left and right grips to enhance the friction and grip comfort of the handle 2. In specific implementations, various covering methods can be adopted: forming strip-shaped or grid-shaped flexible protrusions on the outer surface of the grips to increase the vibration damping area and improve anti-slip performance; setting a flexible material layer of appropriate thickness in the main grip area of ​​the grips, with the surface contour designed according to ergonomic principles; or using a two-color injection molding process to form an aesthetically pleasing flexible material pattern on the surface of the grips, simultaneously achieving vibration damping and decorative functions.

[0061] This design not only provides vibration damping to the connection point but also significantly improves the tool's feel and operability. When the user holds the tool, the palm is in direct contact with the flexible material, which reduces vibration transmission, provides a soft and comfortable grip, and increases the coefficient of friction to prevent the tool from slipping out of the hand.

[0062] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments; the embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes, modifications, substitutions, and variations can be made to this utility model without departing from its spirit and scope, and all such changes, modifications, substitutions, and variations fall within the scope of the claimed utility model.

Claims

1. A power tool, characterized in that, include: The main body includes a housing, the housing being connected to a motor and an output shaft driven by the motor; The handle includes a grip portion and a connecting portion, the grip portion and the connecting portion being an integrally molded structure, the connecting portion being made of a flexible material and connected to the housing; Fasteners for connecting and securing the body and handle; The connecting portion is configured to absorb at least part of the impact vibration transmitted from the output shaft to the housing through its flexible deformation during the operation of the power tool, thereby reducing the impact transmitted to the handle.

2. The power tool according to claim 1, characterized in that, The connecting portion includes a first connecting portion disposed inside the grip portion, the first connecting portion being used to attenuate the vibration of the housing in a first direction.

3. The power tool according to claim 2, characterized in that, The connecting portion includes a second connecting portion that at least covers the first end edge of the grip portion. The second connecting portion is used to dampen the vibration of the housing in a second direction, which is the axial direction of the fastener.

4. The power tool according to claim 3, characterized in that, The first direction and the second direction are perpendicular to each other.

5. The power tool according to claim 2, characterized in that, The housing includes a connecting hole or a connecting post, and the gripping part is provided with a connecting post or a connecting hole corresponding to the housing. The first connecting part is disposed on the outer surface of the connecting post or the inner surface of the connecting hole of the gripping part and is connected to the connecting hole or connecting post on the housing.

6. The power tool according to claim 5, characterized in that, The outer surface of the connecting post or the inner surface of the connecting hole on the gripping part is provided with an anti-detachment structure to enhance the bonding strength between the first connecting part and the connecting post or connecting hole, and to prevent the connecting part from detaching from the connecting post or connecting hole on the gripping part.

7. The power tool according to claim 5, characterized in that, The fastener passes through the grip and the first connecting part and is connected to the housing.

8. The power tool according to claim 5, characterized in that, The fastener is spaced apart from the first connecting portion and passes through the grip portion to connect to the housing.

9. The power tool according to claim 3, characterized in that, The connecting portion further includes a third connecting portion that covers at least the edge of the second end of the grip portion, the second end being connected to the battery pack via the third connecting portion.

10. The power tool according to claim 3 or 9, characterized in that, The second or third connecting portion further includes an anti-slip connecting portion covering at least a portion of the middle area of ​​the outer surface of the grip portion, so as to enhance the friction and grip comfort of the grip portion.

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