Tightening device and tightening apparatus
By designing the axial degree of freedom of the sensor assembly and the vibration dispersion of the bearing assembly in the tightening device, the problem of low sensor detection accuracy was solved, achieving higher detection accuracy and operational comfort.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 砺星工业科技(上海)有限公司
- Filing Date
- 2025-08-08
- Publication Date
- 2026-07-24
Smart Images
Figure CN224544425U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of tightening equipment technology, specifically to a tightening device and tightening equipment. Background Technology
[0002] In modern industrial production, tightening equipment, including electric screwdrivers, has become an indispensable core piece of equipment in assembly lines, electronics manufacturing, and equipment maintenance, thanks to its efficient and precise fastening tools, adjustable torque output, and intelligent control functions. Through its precise torque adjustment mechanism and closed-loop control system, it can achieve accurate tightening and loosening of screws, significantly improving assembly quality and work efficiency.
[0003] As an indispensable power tool in modern industrial production, the core function of an electric screwdriver is to achieve efficient tightening and loosening of screws through precise torque adjustment and limiting mechanisms. As an electrically driven tool, it typically contains a torque sensor. This sensor measures the output torque when an object is rotated or turned. Appropriate torque ensures that the screw achieves the desired tightening effect, preventing over-tightening and damage.
[0004] However, in actual operation, the operator's movement of the electric screwdriver can cause the sensor components to have low detection accuracy, resulting in a significant discrepancy between the actual output torque data and the actual torque data. Utility Model Content
[0005] This application provides a tightening device and a tightening apparatus to solve the problem of low detection accuracy caused by the sensor being affected by its own weight and the weight of the motor.
[0006] In a first aspect, embodiments of this application provide a tightening device, the tightening device comprising a housing, a power module, an output head, and a sensor assembly. The housing includes an installation space; the power module is disposed within the housing, the power module including a motor and a reducer connected together, the power module also including a module housing, the motor shaft of the motor being poweredly connected to the input shaft of the reducer; the output head is at least partially disposed within the housing and connected to the output shaft of the reducer, the motor being used to drive the output head to rotate via the reducer; the sensor assembly is disposed within the housing and is used to detect the torque of the output head; the sensor assembly is disposed within the installation space, and in the axial direction of the motor, the size of the installation space is larger than the size of the sensor assembly, such that the sensor assembly is slidably accommodated within the installation space; the installation space is disposed at the end of the reducer away from the motor, and the sensor assembly is axially slidably fitted onto the output head, the output head being axially penetrated through the central through-hole of the sensor assembly, and at least partially extending from the housing.
[0007] In this embodiment, the tightening device includes a housing, a power module, an output head, and a sensor assembly. The housing includes an installation space. The power module is disposed within the housing and includes a motor and a reducer connected together. The power module also includes a module housing. The motor shaft is connected to the input shaft of the reducer. The output head is at least partially disposed within the housing and connected to the output shaft of the reducer. The motor drives the output head to rotate via the reducer. The sensor assembly is disposed within the housing and is used to detect the torque of the output head. The sensor assembly is disposed within the installation space, and in the axial direction of the motor, the size of the installation space is larger than the size of the sensor assembly, allowing the sensor assembly to be slidably accommodated within the installation space. The installation space is located at the end of the reducer away from the motor, and the sensor assembly is axially slidably fitted onto the output head. The output head is axially inserted through the central through-hole of the sensor assembly and at least partially extends out of the housing. Thus, the sensor assembly has axial freedom, preventing the tightening device from compressing the sensor assembly during use and avoiding the influence of the weight of the sensor assembly and the gravity component of the power module on the torque, thereby ensuring the detection accuracy of the sensor assembly.
[0008] Optionally, the tightening device further includes a control circuit board and a wiring harness, the control circuit board being disposed on the side of the motor away from the reducer, and the control circuit board being connected to the sensor assembly via the wiring harness.
[0009] In this way, the control circuit board can detect and precisely control the motor to output the appropriate torque through the sensor components.
[0010] Optionally, the tightening device further includes a bearing assembly disposed within the housing, the bearing assembly being disposed between the module housing and the housing, such that the power module is rotatably connected to the housing.
[0011] In this way, by connecting the power module housing and the user's grip shell through the bearing assembly, the vibration of the power module on the user's hand is reduced, thus alleviating hand fatigue. At the same time, during the rotation of the output head driven by the motor and reducer, the impact of the user's hand tremors on the tightening device's accuracy is reduced, improving the tightening device's operational precision.
[0012] Optionally, the module housing includes a first housing and a second housing, the first housing being the outer shell of the motor, and the second housing being the outer shell of the reducer, the first housing and the second housing being connected together.
[0013] Thus, the first housing and the second housing can be used to protect the motor assembly and the reducer gear assembly, respectively, allowing for relatively flexible configuration of the motor and reducer, and enabling power connection via the motor shaft.
[0014] Optionally, the bearing assembly includes a first bearing and a second bearing, the first bearing being disposed between the first housing and the outer casing, and the second bearing being disposed between the second housing and the outer casing, wherein the first bearing is located at the end of the motor closer to the reducer, and the second bearing is located at the end of the reducer farther from the motor.
[0015] In this way, the two bearings absorb the vibrations generated by the power module, which greatly reduces the vibrations transmitted to the housing, thereby improving operating comfort and extending continuous operation time.
[0016] Optionally, the first housing includes a first connecting segment and a second connecting segment extending toward the reducer, the first connecting segment and the second connecting segment being coaxially stepped transition connection, wherein the outer diameter of the first connecting segment is smaller than the outer diameter of the second connecting segment, and an axial stepped surface is formed at the connection between the first connecting segment and the second connecting segment.
[0017] The second housing is fitted onto the first connecting section, and a groove for limiting the first bearing is formed between the second housing and the axial stepped surface.
[0018] In this way, a groove is formed by the axial stepped surface of the first housing and the axial section at one end of the second housing, so as to achieve precise positioning of the first bearing during installation.
[0019] Optionally, the bearing assembly further includes a third bearing disposed between the first housing and the outer casing, and located at the end of the motor away from the reducer. The third bearing cooperates with the first bearing to jointly support the motor.
[0020] In this way, more bearings can further disperse and absorb the vibration generated by the power module, which greatly reduces the vibration energy transmitted to the user's hand, thereby improving operating comfort and extending continuous working time.
[0021] Optionally, the housing includes a first segment, a second segment, and a third segment connected sequentially along the axial direction. The outer diameters of the first segment, the second segment, and the third segment are all equal, and the inner diameter of the second segment is smaller than the inner diameters of the first segment and the third segment, forming a radial stepped structure. The third bearing is installed in the third segment, and the first bearing and the second bearing are both installed in the first segment.
[0022] In this way, the consistency of the outer shell appearance is maintained, making it easier to hold, while the change in inner diameter enables the partitioning and positioning of the bearings, optimizing the internal space and making the structure more compact and reasonable.
[0023] Optionally, the sensor assembly includes a guide protrusion, and the inner wall of the second housing has a corresponding axially extending guide groove, the guide protrusion being axially slidably disposed within the guide groove.
[0024] In this way, the guide protrusion and guide groove work together to allow the sensor assembly to slide within the installation space. This ensures that the sensor assembly can detect in the circumferential direction while having freedom in the axial direction. This prevents the tightening device from squeezing the sensor assembly during use and avoids the influence of the component force generated by the weight of the sensor assembly itself and the gravity of the power module on the torque, thus ensuring the detection accuracy of the sensor assembly.
[0025] Optionally, there are multiple guide grooves and multiple guide protrusions. The multiple guide grooves are distributed at equal angles along the circumference of the second housing, and each guide groove is provided with a guide protrusion.
[0026] In this way, the multiple sets of guide protrusions and guide grooves work together stably, ensuring the accuracy of the sensor assembly's detection.
[0027] Secondly, embodiments of this application provide a tightening device, which includes the tightening apparatus described in any of the above claims.
[0028] This application provides a tightening device and a tightening apparatus. The tightening device includes a housing, a power module, an output head, and a sensor assembly. The housing includes an installation space; the power module is disposed within the housing and includes a motor and a reducer connected together, and the power module also includes a module housing. The motor shaft is poweredly connected to the input shaft of the reducer; the output head is at least partially disposed within the housing and connected to the output shaft of the reducer, and the motor drives the output head to rotate via the reducer; the sensor assembly is disposed within the housing and is used to detect the torque of the output head; the sensor assembly is disposed within the installation space, and in the axial direction of the motor, the size of the installation space is larger than the size of the sensor assembly, allowing the sensor assembly to be slidably accommodated within the installation space; the installation space is located at the end of the reducer away from the motor, and the sensor assembly is axially slidably fitted onto the output head, the output head being axially penetrating through a central through-hole in the sensor assembly, and at least partially extending from the housing. Thus, by providing the sensor assembly with axial freedom, the tightening device does not compress the sensor assembly during use, ensuring the detection accuracy of the sensor assembly. Attached Figure Description
[0029] Figure 1 This is a cross-sectional structural diagram of a tightening device provided for one embodiment of this specification.
[0030] Figure 2 This is a schematic diagram of a tightening device provided for one embodiment of this specification.
[0031] Figure 3 This is another cross-sectional structural schematic diagram of the tightening device provided in one embodiment of this specification.
[0032] Figure 4 Another structural schematic diagram of a tightening device provided for one embodiment of this specification.
[0033] Figure 5 Another cross-sectional structural schematic diagram of the tightening device provided in one embodiment of this specification.
[0034] Figure 6 This is another cross-sectional structural schematic diagram of the tightening device provided in one embodiment of this specification.
[0035] Figure 7 This is an exploded view of a tightening device provided in one embodiment of this specification.
[0036] Figure 8 This is a schematic diagram of a tightening device provided for one embodiment of this specification.
[0037] Explanation of reference numerals in the attached figures
[0038] 100. Tightening device; 10. Housing; 11. First section; 12. Second section; 13. Third section; 14. Installation space; 20. Power module; 21. Motor; 211. First housing; 212. Motor shaft; 213. First connecting section; 214. Second connecting section; 22. Reducer; 221. Second housing; 222. Input shaft; 223. Output shaft; 23. Module housing; 30. Output head; 40. Bearing assembly; 41. First bearing; 42. Second bearing; 43. Third bearing; 50. Slot; 51. Axial stepped surface; 60. Sensor assembly; 61. Guide protrusion; 62. Guide groove; 70. Control circuit board; 80. Wiring harness; 200. Tightening equipment. Detailed Implementation
[0039] The technical solutions in the embodiments of this specification will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.
[0040] In this specification, the accompanying drawings are not necessarily drawn to scale, and local features may be enlarged or reduced to show the details of the local features more clearly.
[0041] Unless otherwise stated, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of this specification. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items. The singular forms "a," "the," and "the" as used in this specification and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.
[0042] In the description of this specification, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this specification, "a plurality of" means two or more, unless otherwise explicitly specified.
[0043] In the description of this specification, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "height," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of simplifying the description in this specification and do not indicate that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. In other words, they should not be construed as limitations on this application.
[0044] In the description of this specification, unless otherwise expressly defined, the terms "installation," "connection," "joining," "fixing," "setting," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can also refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this specification according to the specific circumstances.
[0045] Currently, the core of tightening devices lies in their torque measurement and control system. Mainstream products generally employ torque sensors based on resistance strain gauges. This technology converts mechanical strain into resistance change, which is then converted into a measurable voltage signal via signal conditioning circuitry, ultimately calculating the real-time torque value. This measurement scheme boasts advantages such as fast response speed, high measurement accuracy, and good stability, and has matured in the industrial field. However, in actual use, operators hold the tightening device to tighten fasteners at different locations on different structural components. During this process, the tightening device often repeatedly changes position and orientation, for example, vertically upward or downward, or horizontally or obliquely tightening fasteners. Thus, when the tightening device is at different operating angles, the gravitational component of its internal motor, reducer, and other power components is transmitted to the torque sensor through the mechanical structure, creating additional force. Simultaneously, the sensor's own weight also generates interference forces. These external forces, not in the torque direction, cause additional deformation of the strain gauge, resulting in measurement signal distortion.
[0046] Please see Figures 1 to 4One embodiment of this application provides a tightening device 100, which includes a housing 10, a power module 20, an output head 30, and a sensor assembly 60. The housing 10 includes an installation space 14. The power module 20 is disposed within the housing 10 and includes a motor 21 and a reducer 22 that are powered together. The power module 20 also includes a module housing 23. The motor shaft 212 of the motor 21 is poweredly connected to the input shaft 222 of the reducer 22. The output head 30 is at least partially disposed within the housing 10 and connected to the output shaft 223 of the reducer 22. The motor 21 is used to drive the reducer 22. The output head 30 rotates; the sensor assembly 60 is disposed within the housing 10 and is used to detect the torque of the output head 30; the sensor assembly 60 is disposed within the mounting space 14, and in the axial direction of the motor 21, the size of the mounting space 14 is larger than the size of the sensor assembly 60, so that the sensor assembly 60 is slidably accommodated within the mounting space 14; the mounting space 14 is disposed at the end of the reducer 22 away from the motor 21, and the sensor assembly 60 is axially slidably fitted onto the output head 30, the output head 30 is disposed axially through the central through hole of the sensor assembly 60, and at least partially extends out of the housing 10.
[0047] In this embodiment, the tightening device 100 includes a housing 10, a power module 20, an output head 30, and a sensor assembly 60. The housing 10 includes an installation space 14. The power module 20 is disposed within the housing 10 and includes a motor 21 and a reducer 22 that are powered together. The power module 20 also includes a module housing 23. The motor shaft 212 of the motor 21 is poweredly connected to the input shaft 222 of the reducer 22. The output head 30 is at least partially disposed within the housing 10 and connected to the output shaft 223 of the reducer 22. The motor 21 is used to drive the output head 30 to rotate via the reducer 22. The sensor assembly 60 is housed within the housing 10 and is used to detect the torque of the output head 30. The sensor assembly 60 is housed within the mounting space 14, and the size of the mounting space 14 is larger than the size of the sensor assembly 60 in the axial direction of the motor 21, allowing the sensor assembly 60 to be slidably accommodated within the mounting space 14. The mounting space 14 is located at the end of the reducer 22 away from the motor 21, and the sensor assembly 60 is axially slidably fitted onto the output head 30. The output head 30 is axially inserted through the central through-hole of the sensor assembly 60 and at least partially extends out of the housing 10. Thus, the sensor assembly 60 has axial freedom, preventing the tightening device 100 from compressing the sensor assembly 60 during use, avoiding the influence of the weight of the sensor assembly 60 and the component force generated by the gravity of the power module 20 on the torque, thereby ensuring the detection accuracy of the sensor assembly 60.
[0048] In this embodiment, when the operator holds the tightening device 100 in different positions and postures, the tightening device 100 will tighten the fastener at different angles and postures. At this time, in the axial direction of the motor 21, the size of the mounting space 14 is larger than the size of the sensor assembly 60, allowing the sensor assembly 60 to be slidably accommodated within the mounting space 14. That is, the sensor assembly 60 has a small gap space in the axial direction that allows it to slide freely, and the sensor assembly 60 is not affected by the additional weight of the sensor assembly 60 itself or the gravity of the power module 20 in the axial direction. At the same time, the sensor assembly 60 has a degree of freedom in the axial direction, and it can still detect the torque of the output head 30 in the circumferential direction. The force on the sensor assembly 60 in the circumferential direction remains unchanged, thus improving the torque detection accuracy of the sensor assembly 60.
[0049] In some embodiments, the tightening device 100 further includes a bearing assembly 40 disposed within the housing 10, the bearing assembly 40 being disposed between the module housing 23 and the housing 10, such that the power module 20 is rotatably connected to the housing 10.
[0050] Thus, by connecting the housing of the power module 20 and the outer shell 10 held by the user through the bearing assembly 40, the vibration of the power module 20 to the hand is reduced, thereby alleviating hand fatigue. At the same time, as the motor 21 and reducer 22 drive the output head 30 to rotate, the impact of the user's hand tremors on the accuracy of the tightening device 100 is reduced, thereby improving the accuracy of the tightening device 100.
[0051] In this embodiment, the bearing assembly 40 is disposed between the power module 20 and the housing 10, allowing the housing 10 to float on the power module 20. The bearing assembly 40 can withstand circumferential forces, and the motor 21 and reducer 22 will not affect the housing 10 during rotation. Specifically, the inner and outer rings of the bearing assembly 40 can rotate relative to each other. When the power module 20 vibrates, it generates a circumferential force. The bearing assembly 40 can dissipate this circumferential force through rotation, thereby creating a buffer between the power module 20 and the housing 10, reducing the vibration frequency and amplitude when the user holds the housing 10. Thus, by connecting the housing of the power module 20 and the housing 10 held by the user through the bearing assembly 40, the vibration experienced by the hand from the power module 20 is reduced, alleviating hand fatigue. Simultaneously, during the rotation of the output head 30 driven by the motor 21 and reducer 22, the impact of the user's hand tremors on the accuracy of the tightening device 100 is reduced, improving the accuracy of the tightening device 100.
[0052] Specifically, motor 21 converts electrical energy into mechanical energy, and reducer 22 reduces the rotational speed of motor shaft 212 and increases torque. Output head 30 connects to reducer 22, and the output shaft 223 of reducer 22 can precisely mate with screw slots through the special geometry (such as Phillips head, slotted head, hexagonal head, etc.) at the front end of output head 30 to ensure no slippage during power transmission. Bearing assembly 40 provides rotatable and elastic support for housing 10. When the operator uses tightening device 100 for screw assembly, they need to hold the housing 10 of the device continuously. During the operation of power module 20, to prevent mechanical vibrations generated by high-speed rotation of motor 21 and gear meshing from being transmitted to housing 10 through a rigid connection structure, bearing assembly 40 is provided between power module 20 and housing 10 in this embodiment. As an intermediate medium for power transmission, bearing assembly 40 ensures a reliable rotational connection between power module 20 and housing 10, and effectively blocks and absorbs most of the high-frequency vibration energy through its internal precision rolling elements and elastic support structure. Secondly, the optimized vibration transmission path significantly improves the human-computer interaction experience, resulting in a significant reduction in the amplitude of hand tremors, especially during long-term continuous work, which can greatly reduce hand fatigue.
[0053] Optionally, the module housing 23 includes a first housing 211 and a second housing 221. The first housing 211 is the housing of the motor 21, and the second housing 221 is the housing of the reducer 22. The first housing 211 and the second housing 221 are connected together.
[0054] Thus, the first housing 211 and the second housing 221 can be used to protect the motor 21 group and the gear group of the reducer 22, respectively. This allows for relatively flexible arrangement of the motor 21 and the reducer 22, and enables power connection through the motor shaft 212.
[0055] In this embodiment, the outer shell 10 of the tightening device 100 encloses the power module 20 and the bearing assembly 40, placing the power module 20 and the bearing assembly 40 in a relatively enclosed environment. This increases the operational stability of the power module 20 and the bearing assembly 40, ensuring their performance. Similarly, the power module 20 also includes a motor 21 and a reducer 22. The module housing 23 includes a first housing 211 and a second housing 221. The first housing 211 is the outer shell 10 of the motor 21, and the second housing 221 is the outer shell 10 of the reducer 22. The first housing 211 and the second housing 221 are connected together, placing the main parts of the motor 21 and the reducer 22 in a relatively enclosed environment, forming a relatively sealed transmission cavity. This ensures the reliability of power transmission and effectively isolates external dust and impurities from entering, thus guaranteeing the performance of the power module 20.
[0056] In one embodiment, the first housing 211 and the second housing 221 can be integrally formed, that is, the motor 21 and the reducer 22 are integrated together to form a power module 20. In another embodiment, the first housing 211 and the second housing 221 can be separate structures, that is, the motor 21 and the reducer 22 are independent structures, and the motor 21 and reducer 22 that meet the requirements can be directly purchased and combined to form the power module 20 of this application embodiment.
[0057] Specifically, the motor 21, reducer 22, and output head 30 are connected in sequence, allowing the power generated by the motor 21 to be transmitted sequentially to the reducer 22 and output head 30. Specifically, the motor shaft 212 of the motor 21 is powered by the input shaft 222 of the reducer 22, enabling the power generated by the motor 21 to be transmitted to the input shaft 222 of the reducer 22, thus rotating the reducer 22 and transmitting power to its output shaft 223. Simultaneously, the output head 30 is at least partially housed within the housing 10 and connected to the output shaft 223 of the reducer 22, allowing the power of the reducer 22's rotation to be transmitted to the output head 30 via the output shaft 223. Thus, the motor 21 can drive the output head 30 to rotate via the reducer 22. A screwdriver bit can then be mounted on the output head 30, enabling efficient tightening and loosening of screws.
[0058] Furthermore, when the user uses the tightening device 100 to tighten and loosen screws, they need to hold the housing 10 of the tightening device 100. At this time, the power module 20 of the tightening device 100 will vibrate during operation and transmit this vibration to the housing 10. In this embodiment, a bearing assembly 40 is disposed between the power module 20 and the housing 10, allowing the power module 20 to be rotatably connected to the housing 10. This allows the bearing assembly 40 to absorb some of the vibration generated by the power module 20. This reduces the vibration transmitted from the power module 20 to the housing 10, thus reducing hand fatigue, improving operational comfort, and extending continuous working time when the user is using the tightening device 100 to tighten and loosen screws.
[0059] Please see Figures 5 to 7 In some embodiments, the sensor assembly 60 includes a guide protrusion 61, and the inner wall of the second housing 221 is provided with a guide groove 62 extending axially, and the guide protrusion 61 is axially slidably disposed in the guide groove 62.
[0060] Thus, the guide protrusion 61 and the guide groove 62 cooperate to allow the sensor assembly 60 to slide within the installation space 14. This ensures that the sensor assembly 60 can perform detection in the circumferential direction while having freedom in the axial direction. This prevents the tightening device 100 from squeezing the sensor assembly 60 during use, thus avoiding the influence of the torque caused by the weight of the sensor assembly 60 itself and the component force generated by the gravity of the power module 20, thereby ensuring the detection accuracy of the sensor assembly 60.
[0061] In some embodiments, there are multiple guide grooves 62 and multiple guide protrusions 61. The multiple guide grooves 62 are distributed at equal angles along the circumference of the second housing 221, and each guide groove 62 is provided with a guide protrusion 61.
[0062] In this way, the multiple sets of guide protrusions 61 and guide grooves 62 work together stably to ensure the accuracy of the sensor assembly 60.
[0063] In this embodiment, the sensor assembly 60 has a degree of freedom in the axial direction. Multiple sets of guide grooves 62 and guide protrusions 61 cooperate to ensure the axial sliding freedom of the sensor assembly 60 while improving circumferential positioning accuracy. The combined action of multiple guiding mechanisms effectively restricts the circumferential rotation of the sensor assembly 60, ensuring the stability of the detection reference. The multiple sets of guide grooves 62 and guide protrusions 61 cooperate to form multiple circumferential force-bearing points, ensuring accurate and stable force transmission in the circumferential direction of the sensor assembly 60.
[0064] Please see Figure 3 and Figure 4 In some embodiments, the bearing assembly 40 includes a first bearing 41 and a second bearing 42, the first bearing 41 being disposed between the first housing 211 and the outer housing 10, and the second bearing 42 being disposed between the second housing 221 and the outer housing 10, wherein the first bearing 41 is located at the end of the motor 21 near the reducer 22, and the second bearing 42 is located at the end of the reducer 22 away from the motor 21.
[0065] In this way, the inner and outer rings of the first bearing 41 and the second bearing 42 can rotate relative to each other, thereby eliminating the circumferential force. The two bearings disperse and absorb the vibration generated by the power module 20, which greatly reduces the vibration transmitted to the housing 10, thereby improving operating comfort and extending the continuous operation time.
[0066] In this embodiment, the first bearing 41 is disposed outside the first housing 211 of the motor 21, near the reducer 22, and the second bearing 42 is disposed outside the second housing 221 of the reducer 22, away from the motor 21. That is, the first bearing 41, located outside the first housing 211 on the side of the motor shaft 212, primarily filters and absorbs the vibration generated by the rotation of the motor 21, while the second bearing 42, located outside the second housing 221 on the side of the reducer 22's output end, focuses on absorbing the vibration generated by the gear transmission of the reducer 22. Thus, the first bearing 41 and the second bearing 42 can work together to dampen and disperse the vibration generated by the power module 20, significantly reducing the vibration transmitted to the housing 10, thereby improving operational comfort and extending continuous operation time.
[0067] In this embodiment, the specific positions and dimensions of the first bearing 41 and the second bearing 42 are not limited to meet various requirements. For example, the first bearing 41 can be located at the end of the motor 21 away from the reducer 22, and the second bearing 42 can be located at the end of the reducer 22 closer to the motor 21.
[0068] Please see Figure 3 and Figure 5 In some embodiments, the first housing 211 includes a first connecting segment 213 and a second connecting segment 214 extending toward the reducer 22. The first connecting segment 213 and the second connecting segment 214 are coaxially stepped transitionally connected, wherein the outer diameter of the first connecting segment 213 is smaller than the outer diameter of the second connecting segment 214, and an axial stepped surface 51 is formed at the connection between the first connecting segment 213 and the second connecting segment 214. The second housing 221 is sleeved on the first connecting segment 213, and a groove 50 for limiting the first bearing 41 is formed between the second housing 221 and the axial stepped surface 51.
[0069] Thus, a groove 50 is formed by the axial stepped surface 51 of the first housing 211 and the axial section of one end of the second housing 221, so as to achieve precise positioning of the first bearing 41 during installation.
[0070] In this embodiment, the first connecting section 213 of the first housing 211 is closer to the reducer 22 than the second connecting section 214, and the first connecting section 213 and the second connecting section 214 are arranged in a step-like manner from low to high. That is, the first connecting section 213 and the second connecting section 214 are connected in a coaxial stepped transition from low to high. In this way, when the first housing 211 and the second housing 221 are installed together, the first connecting section 213, which has a smaller outer diameter, can extend at least partially into the second housing 221, so that the outer wall of the first connecting section 213 is in close contact with the inner wall of the second housing 221, forming a relatively sealed environment inside the first housing 211 and the second housing 221, ensuring the working stability of the power module 20. In addition, the motor shaft 212 of the motor 21, the input shaft 222 of the reducer 22, and the coupling connecting the two shafts can be located at the first connecting section 213 to ensure the stability of the transmission.
[0071] Furthermore, at least a portion of the first connecting segment 213 extends into the second housing 221, with the exposed portion of the first connecting segment 213 providing a mounting platform for the first bearing 41. Additionally, the second connecting segment 214, with its larger outer diameter, and the first connecting segment 213, with its smaller outer diameter, form a stepped surface 51 at their connection. This stepped surface 51 corresponds to the axial section of the second housing 221 facing the first housing 211, and together with the exposed portion of the first connecting segment 213, they form a groove 50 for positioning the first bearing 41. This allows the first bearing 41 to be installed into the exposed portion of the first connecting segment 213, limiting its position to between the stepped surface 51 and the axial section of the second housing 221, ensuring the installation accuracy of the first bearing 41.
[0072] Please see Figure 3 , Figure 4 and Figure 6 In some embodiments, the bearing assembly 40 further includes a third bearing 43, which is disposed between the first housing 211 and the outer housing 10 and located at the end of the motor 21 away from the reducer 22. The third bearing 43 cooperates with the first bearing 41 to jointly support the motor 21.
[0073] In this way, more bearings can further disperse and absorb the vibration generated by the power module 20, which greatly reduces the vibration energy transmitted to the user's hand, thereby improving operating comfort and extending continuous working time.
[0074] In this embodiment, the third bearing 43 is located at the end of the motor 21 housing away from the reducer 22, and cooperates with the first bearing 41 to further disperse and absorb the vibration generated by the motor 21 during operation in the power module 20. At the same time, the cooperation of the three bearings can further disperse and absorb the vibration generated by the power module 20 during operation, so that the vibration energy transmitted to the user's hand is greatly reduced, thereby improving operating comfort and extending continuous working time.
[0075] Understandably, to ensure the output power of the motor 21, the motor 21 in this embodiment is often relatively long. Therefore, the third bearing 43 cooperates with the first bearing 41, and the two bearings support the motor 21 inside the housing 10 on both sides, allowing the motor 21 to rotate stably within the housing 10. Simultaneously, the three bearings are respectively positioned on both sides and in the middle of the power module 20, jointly supporting the power module 20 inside the housing 10, enabling the power module 20 to operate stably within the housing 10.
[0076] Please see Figure 6 In some embodiments, the housing 10 includes a first segment 11, a second segment 12, and a third segment 13 connected together axially. The outer diameters of the first segment 11, the second segment 12, and the third segment 13 are all equal, and the inner diameter of the second segment 12 is smaller than the inner diameters of the first segment 11 and the third segment 13, forming a radial stepped structure. The third bearing 43 is installed in the third segment 13, and the first bearing 41 and the second bearing 42 are both installed in the first segment 11.
[0077] In this way, the appearance of the outer shell 10 is kept consistent, making it easier to hold. At the same time, the bearing is partitioned and positioned by changing the inner diameter, which optimizes the internal space and makes the structure more compact and reasonable.
[0078] In this embodiment, the housing 10 adopts a three-section coaxial design with equal outer diameters, forming a radial stepped structure through changes in inner diameter. Specifically, the first section 11 and the third section 13 of the housing 10 have larger inner diameters, providing ample space within the housing 10 for bearing installation. The second section 12 has a smaller inner diameter, forming a radial limit within the housing 10 to separate the first section 11 and the second section 12. The larger inner diameter of the third section 13 provides space for the installation of the third bearing 43, which is installed separately within the third section 13. The larger inner diameter of the first section 11 provides space for the installation of the first bearing 41 and the second bearing 42, both of which are installed within the first section 11. This design maintains the uniform and regular shape of the housing 10 while utilizing the stepped internal structure to achieve precise positioning and rational layout of the bearings. This ensures the installation accuracy and load-bearing capacity of each bearing, optimizes the internal space allocation, and makes the overall structure more compact.
[0079] Please see Figures 3 to 7 In some embodiments, the tightening device 100 further includes a sensor assembly 60 disposed within the housing 10 and used to detect the torque at the output end of the output head 30.
[0080] In this way, by directly embedding the sensor assembly 60 inside the housing 10, the sensor assembly 60 is effectively protected from the influence of the external environment, and the accurate acquisition and real-time feedback of torque data are achieved, enabling the operator to precisely control the force.
[0081] In this embodiment, when the tightening device 100 is working, the motor 21 rotates and transmits power sequentially to the reducer 22 and the output head 30. The reducer 22 reduces the transmission speed and increases the rotational torque through its internal transmission component. Simultaneously, a screwdriver head is installed on the output head 30 for tightening or loosening screws. In actual operation, different screws may require different installation torques. Therefore, by incorporating a sensor assembly 60 into the tightening device 100, the torque at the output end of the output head 30 can be detected, allowing the tightening assembly to provide more precise torque for the screws that need tightening or loosening during actual operation. By directly integrating the sensor assembly 60 inside the housing 10, the precision sensing element is effectively protected from external environmental influences, while also achieving accurate torque data acquisition and real-time feedback, enabling operators to precisely control the tightening force.
[0082] Please see Figure 6 In some embodiments, the housing 10 further includes a mounting space 14, in which the sensor assembly 60 is disposed, and in the axial direction of the motor 21, the size of the mounting space 14 is larger than the size of the sensor assembly 60, such that the sensor assembly 60 is slidably accommodated within the mounting space 14.
[0083] Thus, the sensor assembly 60 has a degree of freedom in the axial direction, so that the tightening device 100 will not squeeze the sensor assembly 60 during use, and avoid the influence of the torque caused by the weight of the sensor assembly 60 itself and the component force generated by the gravity of the power module 20, so as to ensure the detection accuracy of the sensor assembly 60.
[0084] In this embodiment, the axial dimension (i.e., the direction of the motor 21 spindle) of the mounting space 14 is precisely designed to allow for a suitable margin compared to the external dimensions of the sensor assembly 60, forming a small, adjustable gap. This carefully designed dimensional fit allows the sensor assembly 60 to achieve a small but precise sliding displacement in the axial direction. In this embodiment, the axial dimension of the mounting space 14 is not limited to be larger than that of the sensor assembly 60, to meet different needs. In one embodiment, the mounting space 14 forms an adjustable gap of 0.5-2 mm compared to the external dimensions of the sensor assembly 60. For example, the adjustable gap between the mounting space 14 and the external dimensions of the sensor assembly 60 can be 0.5 mm, 1 mm, 1.5 mm, or 2 mm.
[0085] This provides the sensor assembly 60 with axial freedom, ensuring that it is not subjected to rigid compression from the housing 10 during the operation of the tightening device 100. Secondly, it effectively isolates the axial component of the sensor assembly 60's own weight and the gravity of the power module 20, avoiding interference from these external forces on the torque measurement accuracy. Furthermore, this floating mounting method can compensate for minor dimensional errors during manufacturing and assembly, ensuring that the sensor assembly 60 is always in optimal working condition.
[0086] Please see Figure 4 and Figure 6 In some embodiments, the mounting space 14 is located at the end of the reducer 22 away from the motor 21, and the sensor assembly 60 is axially slidably mounted on the output head 30, the output head 30 being disposed axially through the central through hole of the sensor assembly 60, and at least partially extending from the housing 10.
[0087] Thus, by positioning the sensor assembly 60 at the front of the tightening device 100, the torque accuracy of the output head 30 acquired by the sensor assembly 60 can be improved, and space utilization can be increased. Simultaneously, the sensor assembly 60 can move freely axially within the installation space 14, and torque detection of the output head 30 can still be performed during this process. This avoids the influence of the weight of the sensor assembly 60 itself and the component force generated by the gravity of the power module 20 on the torque, thereby ensuring the detection accuracy of the sensor assembly 60.
[0088] In this embodiment, the sensor assembly 60 is positioned at the end of the reducer 22 furthest from the motor 21. The output head 30 is axially inserted through the central through-hole of the sensor assembly 60, allowing the sensor assembly 60 to be axially slidably mounted on the output head 30, achieving a compact layout and saving installation space 14. Furthermore, the axial slidability of the sensor assembly 60 on the output head 30 allows the output head 30 to directly feed back the actual output torque to the sensor assembly 60. Since the torque is directly acquired through the output head 30 without transmission loss, the torque acquired by the sensor assembly 60 is more accurate. Simultaneously, the axial sliding of the sensor assembly 60 relative to the output head 30 can compensate for assembly errors; or, when the tightening device 100 is operating, it can compensate for displacement caused by vibration, reducing the impact of vibration on the sensor assembly 60. The mounting space 14 provides axial freedom for the sensor assembly 60, ensuring that the sensor assembly 60 is not subjected to rigid compression from the housing 10 during the operation of the tightening device 100. Secondly, it effectively isolates the axial component of the sensor assembly 60's own weight and the gravity of the power module 20, avoiding interference from these external forces on torque measurement accuracy. Furthermore, this floating mounting method can compensate for minor dimensional errors during manufacturing and assembly, ensuring that the sensor assembly 60 is always in optimal working condition. Additionally, at least partially, the output head 30 extends from the housing 10, facilitating quick installation or replacement of screwdriver bits and improving work efficiency.
[0089] Please see Figure 6 In some embodiments, the tightening device 100 further includes a control circuit board 70 and a wiring harness 80. The control circuit board 70 is disposed on the side of the motor 21 away from the reducer 22, and the control circuit board 70 is connected to the sensor assembly 60 via the wiring harness 80.
[0090] Thus, the control circuit board 70 can detect and precisely control the motor 21 to output appropriate torque through the sensor assembly 60.
[0091] In this embodiment, the tightening device 100 further includes a control circuit board 70 and a wiring harness 80. The control circuit board 70 is connected to the sensor assembly 60 via the wiring harness 80. The wiring harness 80 can transmit the torque data collected by the sensor assembly 60 to the control circuit. The control circuit board 70 then processes the torque data collected by the sensor assembly 60 in real time and outputs control commands to adjust the output power of the motor 21 in real time, thereby adjusting the output torque of the tightening device 100.
[0092] In some embodiments, the first housing 211 and the second housing 221 are integrally formed. This eliminates the assembly gaps of traditional split structures, significantly improving the overall structural strength and sealing performance.
[0093] In this embodiment, the first housing 211 and the second housing 221 can be integrally manufactured by casting or injection molding processes to form a seamless, integrated structure. This eliminates the assembly gaps inherent in traditional split structures, significantly improving overall structural strength and sealing performance, optimizing force transmission paths, reducing the number of parts, and lowering assembly complexity.
[0094] Please see Figure 8 This application also provides a tightening device 200, which includes the tightening device 100 described above.
[0095] In this application embodiment, the type of tightening device 200 is not limited to meet various needs. In this embodiment, the tightening device 100 can be an electric screwdriver, while the tightening device 200 can be a machine tool or operating platform equipped with the tightening device 100 of this application embodiment. The tightening device 200 can have all the technical features and effects of the tightening device 100 described above, resulting in less vibration during operation, better operational stability and service life, and improved user experience.
[0096] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.
[0097] The functions and effects of this embodiment can be explained by referring to the foregoing implementation methods, and will not be repeated here.
[0098] It is understood that in the various embodiments of this specification, the sequence number of each process does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this specification.
[0099] It is understood that the various implementation methods described in this specification can be implemented individually or in combination, and the embodiments in this specification are not limited in this respect.
[0100] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the aforementioned method implementations, and will not be repeated here.
[0101] The above are merely specific embodiments of this specification, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this specification should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.
Claims
1. A tightening device, characterized in that, include: The casing, including the mounting space; The power module housed within the housing includes a motor and a reducer connected together. The power module also includes a module housing. The motor shaft of the motor is poweredly connected to the input shaft of the reducer. An output head, which is at least partially disposed within the housing and connected to the output shaft of the reducer, is provided by a motor for driving the output head to rotate via the reducer. A sensor assembly is disposed within the housing and is used to detect the torque of the output head; the sensor assembly is disposed within the mounting space, and in the axial direction of the motor, the size of the mounting space is larger than the size of the sensor assembly, such that the sensor assembly is slidably accommodated within the mounting space; The mounting space is located at the end of the reducer away from the motor, and the sensor assembly is axially slidably mounted on the output head, the output head being disposed axially through the central through hole of the sensor assembly, and at least partially extending from the housing.
2. The tightening device according to claim 1, characterized in that, The tightening device also includes a control circuit board and a wiring harness. The control circuit board is located on the side of the motor away from the reducer, and the control circuit board is connected to the sensor assembly via the wiring harness.
3. The tightening device according to claim 1, characterized in that, The tightening device further includes a bearing assembly disposed within the housing, the bearing assembly being positioned between the module housing and the housing, such that the power module is rotatably connected to the housing.
4. The tightening device according to claim 3, characterized in that, The module housing includes a first housing and a second housing. The first housing is the outer shell of the motor, and the second housing is the outer shell of the reducer. The first housing and the second housing are connected together.
5. The tightening device according to claim 4, characterized in that, The bearing assembly includes a first bearing and a second bearing. The first bearing is disposed between the first housing and the outer housing, and the second bearing is disposed between the second housing and the outer housing. The first bearing is located at the end of the motor closer to the reducer, and the second bearing is located at the end of the reducer away from the motor.
6. The tightening device according to claim 5, characterized in that, The first housing includes a first connecting section and a second connecting section extending toward the reducer. The first connecting section and the second connecting section are coaxially stepped transitionally connected. The outer diameter of the first connecting section is smaller than the outer diameter of the second connecting section. An axial stepped surface is formed at the connection between the first connecting section and the second connecting section. The second housing is fitted onto the first connecting section, and a groove for limiting the first bearing is formed between the second housing and the axial stepped surface.
7. The tightening device according to claim 5, characterized in that, The bearing assembly further includes a third bearing, which is disposed between the first housing and the outer housing, and located at the end of the motor away from the reducer. The third bearing cooperates with the first bearing to support the motor.
8. The tightening device according to claim 7, characterized in that, The outer shell includes a first section, a second section, and a third section connected together in sequence along the axial direction. The outer diameters of the first section, the second section, and the third section are all equal, and the inner diameter of the second section is smaller than the inner diameters of the first section and the third section, forming a radial stepped structure. The third bearing is installed in the third section, and the first bearing and the second bearing are both installed in the first section.
9. The tightening device according to claim 4, characterized in that, The sensor assembly includes a guide protrusion, and the inner wall of the second housing has a corresponding axially extending guide groove, and the guide protrusion is axially slidably disposed in the guide groove.
10. The tightening device according to claim 9, characterized in that, The number of guide grooves and guide protrusions are both multiple. The multiple guide grooves are distributed at equal angles along the circumference of the second housing, and the guide protrusion is provided in each guide groove.
11. A tightening device, characterized in that, The tightening device includes any one of claims 1 to 10.