Damping structure and power tool

Abstract

The application discloses a damping structure and an electric tool. The damping structure comprises a machine body and a handle. The handle is in floating connection with the machine body. The damping structure further comprises a connecting piece, one end of which is in rotary connection with one of the machine body and the handle, and the other end of which is in sliding connection with the other one of the machine body and the handle. An elastic piece is arranged between the machine body and the connecting piece or between the handle and the connecting piece, and is used for providing elastic restoring force to the connecting piece. The connecting piece is configured to slide between a first position and a second position, and the first position and the second position correspond to the maximum distance and the minimum distance between the handle and the machine body respectively. The damping structure and the electric tool of the application can effectively dissipate and buffer the vibration energy between the handle and the machine body, so that the vibration transmitted to the handle is significantly reduced.

Description

Technical Field

[0001] This application relates to the field of power tool technology, and more specifically, to a shock-absorbing structure and a power tool. Background Technology

[0002] In various handheld power tools, gardening equipment, or other power machinery, the vibrations generated during operation are directly transmitted to the handle held by the operator. Long-term use can easily lead to operator fatigue, discomfort, and even health problems.

[0003] To improve ergonomics, existing technologies typically incorporate shock-absorbing elements, such as rubber pads or springs, between the controller and the handle to create a simple floating connection. However, these conventional shock-absorbing structures often only provide linear cushioning in a single direction, offering limited effectiveness against multi-directional and complex vibrations. Furthermore, their loose structure can negatively impact operational stability and feel. In addition, some designs, aimed at limiting excessive handle movement, often feature complex structures that may introduce unnecessary friction and jamming.

[0004] Therefore, there is an urgent need for a handle damping structure that is compact, has reliable limiting, and can effectively attenuate multi-directional vibrations, so as to improve the damping effect and user experience while ensuring stable operation. Utility Model Content

[0005] In view of this, this application provides a shock-absorbing structure and power tool that effectively dissipates and buffers vibration energy between the handle and the body, thereby significantly reducing the vibration transmitted to the handle.

[0006] In a first aspect, this application provides a shock-absorbing structure, including a body and a handle; the handle is floatingly connected to the body, and the shock-absorbing structure further includes: The connector is rotatably connected to one of the body or the handle, and slidably connected to the other of the body or the handle; An elastic element, disposed between the body and the connector or between the handle and the connector, is used to provide an elastic restoring force to the connector; The connector is configured to slide between a first position and a second position, which correspond to the maximum and minimum distances between the handle and the body, respectively.

[0007] By adopting the above technical solution, the connector and elastic element work together to give the floating connection between the body and the handle a clear motion guide and stroke range. This converts the vibration generated by the body into elastic deformation of the connector under the combined sliding and rotational motion, thereby effectively absorbing and dissipating vibration energy and achieving smooth shock absorption. The connector, through its unique connection method of rotating at one end and sliding at the other, transforms the complex relative motion between the body and the handle into a controllable combined sliding and rotational motion of the connector itself, allowing for efficient absorption and dissipation of vibration energy from different directions. Simultaneously, the clear definition of the first and second positions sets reliable motion stroke boundaries for the entire floating connection system, ensuring effective utilization of the shock absorption stroke while preventing structural interference or damage due to overtravel. This makes the shock absorption process stable and reliable, and also ensures the reliability of the connection between the handle and the body.

[0008] In some implementations, at least one end of the handle is floatingly connected to the body.

[0009] By adopting the above technical solution, while ensuring the floating connection between the handle body and the main body, the necessary shock absorption stroke can be achieved through the floating connection at at least one end, making the overall structure simpler, more reliable, and easier to assemble.

[0010] In some embodiments, the body or handle is provided with a slide groove, the connector slides in cooperation with the slide groove, and the two ends of the slide groove along the sliding direction correspond to the first position and the second position respectively.

[0011] By adopting the above technical solution, the slide not only provides precise linear sliding guidance for the connector, but its two ends also naturally form a mechanical limit for the sliding stroke, ensuring that the shock absorption structure works stably and reliably between the maximum and minimum distances, preventing structural damage caused by overtravel and handle detachment.

[0012] In some implementations, one end of the connector is rotatably connected to the handle, and the other end is slidably connected to the body; the connector slides into the groove via a sliding portion.

[0013] By adopting the above technical solution, this structure decomposes the vibration of the handle into the rotation of the connecting part relative to the handle and the sliding relative to the body. The coupling of the two motions can effectively adapt to vibration excitation in different directions, and the cooperation between the sliding part and the slide groove ensures the accuracy of the motion trajectory and improves the shock absorption efficiency.

[0014] In some embodiments, the connector includes a shaft hole and a guide portion, the handle is provided with a sliding shaft, the sliding shaft is slidably inserted into the shaft hole to form the rotatable connection; the sliding portion is disposed on the sliding shaft; and the guide portion is slidably connected to the machine body.

[0015] By adopting the above technical solution, a stable and low-resistance rotating pair is achieved through the cooperation of the shaft hole and the sliding shaft. The sliding connection between the guide part and the machine body provides additional motion constraints for the entire connecting part, making the connecting part more stable in the sliding process, avoiding off-center loading and jamming, and ensuring smooth vibration reduction.

[0016] In some embodiments, the body is provided with a guide hole, and the guide portion is slidably inserted into the guide hole.

[0017] By adopting the above technical solution, the guide hole provides a precise sliding track for the guide part of the connector, further restricting the degree of freedom of the connector in unnecessary directions, enhancing the overall rigidity and motion accuracy of the damping structure, and making the damping process more stable and controllable.

[0018] In some embodiments, the sidewall of the guide portion is provided with a guide surface.

[0019] By adopting the above technical solution, the guide surface effectively reduces frictional resistance and wear when the guide part slides within the guide hole, making the sliding smoother and helping to prevent jamming caused by debris generated during long-term use, thus improving the durability and reliability of the structure. The guide surface also facilitates the assembly of connecting parts and the machine body.

[0020] In some embodiments, when the connector is in the first position, the body or handle is provided with a limiting structure that cooperates with the connector. The limiting structure is configured to restrict the rotation of the connector and allow the connector to move in its sliding direction.

[0021] By adopting the above technical solution, when the connector slides to the maximum distance (first position), the limiting structure can prevent it from continuing to rotate, forcing the vibration energy to be absorbed mainly through the sliding of the connector and the compression / stretching of the elastic element, avoiding the instability caused by structural shaking at the extreme position, and ensuring safety and feel in use.

[0022] In some implementations, the elastic element is any one of a compression spring, a tension spring, or a torsion spring.

[0023] By adopting the above technical solution, a variety of elastic elements are provided, which enables the structure to be flexibly adapted to the spatial layout, force direction and stiffness requirements of different products, thereby enhancing the versatility and designability of the vibration damping structure.

[0024] Secondly, this application provides an electric tool including the shock-absorbing structure of the first aspect.

[0025] By adopting the above technical solution and applying the above shock-absorbing structure to power tools, the vibration and impact transmitted from the body to the handle during operation can be significantly reduced, improving the operator's grip comfort, reducing fatigue, and helping to improve the operating accuracy and service life of power tools.

[0026] In summary, this application has at least one of the following beneficial technical effects: 1. Achieve efficient multi-directional vibration reduction: Through the unique rotation and sliding composite connection design of the connector, vibrations from different directions can be effectively decomposed, absorbed and dissipated, and the vibration reduction effect is significantly better than that of a single linear buffer structure.

[0027] 2. Compact structure and reliable operation: By utilizing the coordinated operation of the sliding groove, guide hole and limiting structure, the movement stroke and attitude of the connecting parts are precisely constrained within a compact space, ensuring that the shock absorption process is smooth and predictable, and there is no loosening or jamming.

[0028] 3. Enhance user experience and product adaptability: While providing excellent shock absorption performance, the overall structure also significantly improves operating comfort and tool quality through the flexibility of elastic component selection and organic integration with power tools, making it widely applicable. Attached Figure Description

[0029] Figure 1 This is a structural schematic diagram of the vibration reduction structure of this application; Figure 2 This is an exploded structural diagram of the vibration reduction structure of this application; Figure 3 This is a structural schematic diagram of the connector; Figure 4 This is a schematic diagram of the structure of the left shank shell; Figure 5 This is a schematic diagram of the right shank shell structure; Figure 6 This is a schematic diagram of the shock-absorbing structure after the left handle shell of this application has been removed; Figure 7 This is a cross-sectional schematic diagram of the vibration reduction structure of this application; Figure 8 yes Figure 7 Enlarged diagram of area A in the middle; Figure 9 This is a schematic diagram of the appearance and structure of the power tool in this application.

[0030] Explanation of reference numerals in the attached drawings: 1. Machine body; 11. Slide groove; 12. Limiting structure; 13. Guide hole; 2. Plastic ring; 3. Handle; 31. Left handle shell; 311. Slide shaft; 32. Right handle shell; 321. Bushing; 4. Connecting part; 41. Snap shaft; 42. Shaft hole; 43. Guide part; 431. Guide surface; 44. Baffle; 5. Elastic element; 6. Tool head. Detailed Implementation

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] Example 1: Please see Figures 1-8 This application provides a shock-absorbing structure, which is particularly suitable for mechanical equipment that needs to suppress vibration transmission, such as handheld power tools. The shock-absorbing structure mainly includes a body 1, a handle 3, a connector 4, an elastic element 5, and related guide and limiting components. A plastic ring 2 is connected between the body 1 and the handle 3, which is used to elastically deform according to the change in distance between the handle 3 and the body 1 to shield and seal the internal structure.

[0037] The body 1 is the core functional component of the equipment (such as the motor and transmission housing of a power tool), and several mounting structures can be installed on it. The handle 3 is the part for the operator to hold, and it is "floatingly connected" to the body 1 through this shock-absorbing structure. That is, the handle 3 is not rigidly fixed to the body 1, but can move relative to the body 1 within a certain range. This movement is designed to absorb and isolate vibration.

[0038] Please see Figure 2 and Figure 3 The core of the floating connection is the connector 4, which includes an integrally connected retaining shaft 41, guide portion 43, and baffle 44. The end face of the guide portion 43 is provided with a guide surface 431, and a shaft hole 42 is also provided between the guide portion 43 and the retaining shaft 41. A baffle 44 is provided on the lower side of the guide portion, and a gap is provided between the baffle 44 and the guide portion 43 to allow the elastic element 5 to pass through. In this embodiment, the connector 4 is a rigid component with a specific geometry, such as a molded metal or high-strength plastic part. Its key feature is that it forms a rotational connection with one of the body 1 and the handle 3, while simultaneously forming a sliding connection with the other. This "rotation and sliding" connection method is the mechanical basis for the efficient and controllable shock absorption of this structure. The handle 3 is fastened as a whole by fasteners after being snapped together by the left handle shell 31 and the right handle shell 32. In this embodiment, it is fixed by screws.

[0039] Please see Figures 2-8 In a preferred embodiment, the shaft hole 42 of the connector 4 engages with the sliding shaft 311 mounted on the handle 3. The sliding shaft 311 passes through the shaft hole 42, allowing the connector 4 to rotate freely around the axis of the sliding shaft 311, thus forming a rotational connection between the connector 4 and the handle 3. The guide portion 43 of the connector 4 is columnar, and an elastic element 5 is sleeved on its outer periphery to provide elastic force to the connector 4. In this embodiment, the elastic element 5 is a columnar spring.

[0040] To precisely guide the sliding movement of the connector 4 and limit its stroke, a groove 11 is provided on the body 1 or handle 3. In this embodiment, the groove 11 is preferably provided on the body 1. The connector 4 or the component fixed to it is provided with a sliding part, which forms a sliding fit with the groove 11. Specifically, the sliding part can be a part of the sliding shaft 311 (i.e., a part of the sliding shaft 311 itself slides in the groove 11), or it can be a slider structure protruding from the body of the connector 4. In this embodiment, the sliding shaft 311 on the left handle shell 31 passes through the shaft hole 42 of the connector 4 and engages with the bushing 321 on the right handle shell 32. The sliding shaft 311 or bushing 321 is rotatably connected to the shaft hole 42, while the outer peripheral surfaces of the sliding shaft 311 and bushing 321 are in sliding fit with the groove 11. The slide groove 11 extends along the main direction of motion of the connector 4 when it is excited. Its two ends along its length—the distal end near the handle 3 and the proximal end near the body 1—have physical boundaries, defined as the first position and the second position, respectively. When the sliding part abuts against the distal boundary of the slide groove 11, the connector 4 is in the first position, at which point the distance between the handle 3 and the body 1 is maximized. When the sliding part abuts against the proximal boundary of the slide groove 11, the connector 4 is in the second position, at which point the handle 3 is closest to the body 1 under the action of elastic force or external force, and the distance between them is minimized. The boundaries of the slide groove 11 thus naturally constitute a mechanical limit for the stroke. Specifically, the slide groove 11 is an oblong hole, thereby defining two extreme positions between the handle 3 and the body 1.

[0041] To prevent excessive rotation of the connector 4 at its maximum stroke (first position), which could lead to structural instability or abnormal noise, this embodiment includes a limiting structure 12. This limiting structure 12 activates when the connector 4 slides to the first position. For example, the limiting structure 12 can be a hook-shaped structure on the body 1. When the connector 4 reaches this position, the retaining shaft 41 enters the groove of the limiting structure 12, thus restricting the connector 4 from continuing to rotate around the sliding shaft 311, but not preventing it from continuing to slide along the guide direction of the sliding groove 11 and the guide hole 13. This ensures that at the extreme position, the system primarily absorbs energy through the deformation of the elastic element 5, reducing the probability of the connector 4 rotating out of its sliding trajectory in the first position, making it more stable and reliable. It also facilitates the stability of the connector 4 under the action of the elastic element 5 during installation, aiding in assembly.

[0042] Please see Figure 7 and Figure 8To enhance the stability of the connector 4 during sliding and prevent it from tilting or jamming, a guide hole 13 is provided on the body 1. The guide portion 43 of the connector 4 slidably passes through the guide hole 13, forming a sliding connection with the body 1. The guide hole 13 provides precise guidance for the translation of the connector 4. To further optimize the sliding performance, the end sidewall of the guide portion 43 is machined with a guide surface 431 to reduce the coefficient of friction with the inner wall of the guide hole 13, facilitating smooth entry into the guide hole 13.

[0043] The elastic element 5 provides the system's restoring force and stores and dissipates vibrational energy. The elastic element 5 can be a compression spring, tension spring, or torsion spring. In a typical arrangement, a compression spring, as the elastic element 5, is fitted onto the guide portion 43, with one end abutting against a boss or shoulder on the connector 4 and the other end abutting against a platform on the body 1 surrounding the guide hole 13. Thus, when the handle 3 is subjected to a pulling force away from the body 1 or when the body 1 transmits an impact to the handle 3, the sliding of the connector 4 compresses or releases the compression spring, thereby converting kinetic energy into elastic potential energy and partially dissipating it.

[0044] Brief description of working principle: When the machine body 1 is working, it generates vibration, which tends to be transmitted to the handle 3. The vibration energy forces the handle 3 to move relative to the machine body 1. This movement is transmitted to the connecting member 4 through the sliding shaft 311, and is converted into the rotation of the connecting member 4 around the sliding shaft 311 and the sliding of its guide part 43 along the guide hole 13 and the slide groove 11. This composite movement is subject to the elastic resistance of the elastic member 5, thereby converting the mechanical energy of the vibration into the potential energy of the elastic member 5 and dissipating it. The hard limit at both ends of the slide groove 11 ensures that the movement is always within the safe stroke, while the limiting structure 12 suppresses unnecessary rotational freedom at the maximum stroke, improving the clarity of the feel and the reliability of assembly.

[0045] The shock-absorbing structure in this embodiment can be implemented in various ways according to different working requirements. For example, the shock-absorbing structure can be set at either end of the body 1 and the handle 3, or at both ends of the body 1 and the handle 3. Alternatively, one end of the handle 3 can be rotatably connected to the body 1, and the other end can be connected to the body 1 through the shock-absorbing structure.

[0046] Example 2: This embodiment applies the shock-absorbing structure described in Embodiment 1 to a handheld power tool (such as an electric hammer or electric pick) to demonstrate its integration method and operational advantages in a real product.

[0047] This handheld power tool includes a tool head 6 and a housing 1. The tool head 6 is used to mount tools such as hammers and chisels. The housing 1 houses the motor, gearbox, impact mechanism, etc., which transmits energy to the hammers and chisels to achieve their respective hammering and chiseling functions. A handle 3 is located at the rear or side of the tool. The handle 3 is hollow inside to facilitate cable routing and switch installation. This shock-absorbing structure is cleverly integrated into the connection area between the handle 3 and the housing 1.

[0048] Based on the above figures, during operation, when the tool is subjected to a large upward impact force (such as the recoil from a hammer drill hitting the ground), the handle 3 tends to move upward, and the connecting piece 4 slides downward within the groove 11. The elastic element 5 is pre-installed and always provides elastic force, and it is in a state of maximum compression and minimum compression (or pre-compression) at two extreme positions (the first position and the second position), respectively. The deformation characteristics of the elastic element 5 allow the connecting piece 4 to continue to slide slightly to absorb the impact, but its large damping and deformation resistance effectively suppress the shaking and rotation of the connecting piece 4 (along with the handle 3) near this position, giving the operator a solid feel without any looseness.

[0049] In actual operation, when the electric hammer generates high-frequency, high-amplitude vibrations, these vibrations are transmitted to the machine body 1. Because the handle 3 is connected to the machine body 1 via this shock-absorbing structure and the plastic ring 2, the intense vibrations are transformed into smooth sliding and slight rotation of the connecting piece 4, and effectively absorbed by the compression spring. The vibration amplitude and acceleration transmitted to the operator's hand are significantly attenuated. Simultaneously, the dual guidance of the slide groove 11 and the guide hole 13 ensures that the handle 3 will not exhibit significant lateral swaying relative to the machine body 1 even under heavy loads, maintaining precise directional control. This design allows the tool to maintain strong power while significantly improving comfort during extended operation and reducing strain on the arm.

[0050] 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 shock absorbing structure comprising a body and a handle; characterized in that, The handle is floatingly connected to the body, and the shock absorption structure further includes: The connector is rotatably connected to one of the body or the handle, and slidably connected to the other of the body or the handle; An elastic element, disposed between the body and the connector or between the handle and the connector, is used to provide an elastic restoring force to the connector; The connector is configured to slide between a first position and a second position, which correspond to the maximum and minimum distances between the handle and the body, respectively.

2. The shock absorbing structure of claim 1, wherein At least one end of the handle is floatingly connected to the body.

3. The shock absorbing structure of claim 1, wherein The body or handle is provided with a sliding groove, and the connecting member slides in cooperation with the sliding groove. The two ends of the sliding groove along the sliding direction correspond to the first position and the second position, respectively.

4. The shock absorbing structure according to claim 3, characterized by One end of the connector is rotatably connected to the handle, and the other end is slidably connected to the body; the connector slides into the groove via a sliding part.

5. The shock absorbing structure according to claim 4, wherein The connector includes a shaft hole and a guide portion. The handle is provided with a sliding shaft, which slides through the shaft hole to form the rotatable connection. The sliding portion is provided on the sliding shaft. The guide portion is slidably connected to the machine body.

6. The shock absorbing structure of claim 5, wherein The body is provided with a guide hole, and the guide part is slidably inserted into the guide hole.

7. The damping structure according to claim 5 or 6, characterized by The sidewall of the guide part is provided with a guide surface.

8. The shock absorbing structure of claim 1, wherein When the connector is in the first position, the body or handle is provided with a limiting structure that cooperates with the connector. The limiting structure is configured to restrict the rotation of the connector and allow the connector to move along its sliding direction.

9. The shock absorbing structure of claim 1, wherein The elastic element is any one of a compression spring, a tension spring, or a torsion spring.

10. An electric power tool characterized by comprising: Including the damping structure as described in any one of claims 1-9.

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