Tightening device and tightening equipment

Abstract

The invention provides a tightening device and tightening equipment. The tightening device comprises a shell, a power module and a sensor assembly. The power module comprises a motor and a speed reducer which are in power connection; a motor shaft of the motor is in power connection with an input shaft of the speed reducer; the sensor assembly is arranged in the shell and used for detecting the torque of the motor. The sensor assembly is arranged in the mounting space, and in the axial direction of the motor, the size of the mounting space is larger than that of the sensor assembly, so that the sensor assembly is slidably accommodated in the mounting space; the mounting space is arranged at one end of the motor away from the reducer. Thus, by setting the degree of freedom of the sensor assembly in the axial direction, the tightening device cannot extrude the sensor assembly in the using process, and the detection accuracy of the sensor assembly is guaranteed. Meanwhile, the sensor assembly is arranged at the end, away from the speed reducer, of the motor, the wire harness does not need to penetrate through the motor, and influences of a magnetic field generated by motor work are avoided.

Description

Technical Field

[0001] The present application relates to the technical field of tightening equipment, and specifically to a tightening device and a tightening equipment. Background Art

[0002] In modern industrial production, tightening equipment, including electric screwdrivers, serves as efficient and precise fastening tools. With their adjustable torque output and intelligent control capabilities, they have become indispensable core equipment in assembly lines, electronics manufacturing, and equipment maintenance. Through sophisticated torque adjustment mechanisms and closed-loop control systems, they enable precise tightening and loosening of screws, significantly improving assembly quality and operational efficiency.

[0003] As an indispensable power tool in modern industrial production, electric screwdrivers' core function is to achieve efficient tightening and loosening of screws through precise torque regulation and limiting mechanisms. As electrically powered tools, they typically incorporate a torque sensor, which measures the output torque when rotating or turning an object. Proper torque ensures that screws achieve the desired tightening effect, preventing damage caused by overtightening.

[0004] However, during the use of the electric screwdriver, the operator's movement of the electric screwdriver may cause the sensor component to have low detection accuracy, which is far from the actual data. Summary of the Invention

[0005] Multiple embodiments of the present application provide a tightening device and a tightening apparatus, aiming to solve the problem that the sensor is affected by its own gravity and the gravity of the motor, and the signal is affected by the magnetic force of the motor, resulting in low detection accuracy.

[0006] In a first aspect, an embodiment of the present application provides a tightening device, which includes a housing, a power module and a sensor assembly, the housing including an installation space; the power module is arranged in the housing, the power module includes a motor and a reducer that are dynamically connected together, and the power module also includes a module housing, and the motor shaft of the motor is dynamically connected to the input shaft of the reducer; the sensor assembly is arranged in the housing and is used to detect the torque of the motor; the sensor assembly is arranged in 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, so that the sensor assembly can be slidably accommodated in the installation space; the installation space is arranged at one end of the motor away from the reducer, and the sensor assembly can be axially slidably mounted on the motor shaft of the motor.

[0007] In this embodiment, the tightening device includes a housing, a power module, and a sensor assembly. The housing includes a mounting space. The power module is disposed within the housing. The power module includes a motor and a reducer that are connected together by power. The power module also includes a module housing. The motor shaft of the motor is connected to the input shaft of the reducer. The sensor assembly is disposed within the housing and is used to detect the torque of the motor. The sensor assembly is disposed within the mounting space. In the axial direction of the motor, the size of the mounting space is larger than the size of the sensor assembly, so that the sensor assembly can be slidably accommodated within the mounting space. The mounting space is disposed at an end of the motor away from the reducer, and the sensor assembly can be axially slidably mounted on the motor shaft of the motor. In this way, by setting the axial degree of freedom of the sensor assembly, the tightening device does not squeeze the sensor assembly during use, thereby ensuring the detection accuracy of the sensor assembly. At the same time, by disposing the sensor assembly at the end of the motor away from the reducer, the sensor assembly can be disposed close to the control circuit board, and the wiring harness does not need to pass through the motor, thereby avoiding the influence of the magnetic field generated by the operation of the motor.

[0008] Optionally, the tightening device further includes an output head, which is at least partially disposed in the housing and connected to the output shaft of the reducer, and the motor is used to drive the output head to rotate through the reducer.

[0009] In this way, the motor can realize the rotational tightening action of the fastener through the reducer and the output head.

[0010] Optionally, the tightening device further includes a control circuit board and a wiring harness, wherein the control circuit board is arranged on a side of the sensor assembly away from the motor, and the control circuit board is connected to the sensor assembly via the wiring harness.

[0011] In this way, the control circuit board can detect and accurately control the motor to output appropriate torque through the sensor component.

[0012] Optionally, the tightening device further comprises a bearing assembly disposed in the housing, wherein the bearing assembly is disposed between the module housing and the housing, so that the power module is rotatably connected to the housing.

[0013] By connecting the power module housing and the user's gripped outer shell via the bearing assembly, the user's hand is less susceptible to vibration from the power module, alleviating hand fatigue. Furthermore, the motor and reducer, when driving the output head, reduce the impact of hand shake on the tightening device's accuracy, thereby improving the device's operational precision.

[0014] Optionally, the module housing includes a first housing and a second housing, the first housing is the housing of the motor, the second housing is the housing of the reducer, and the first housing and the second housing are connected together.

[0015] In this way, the first shell and the second shell can be used to protect the motor group and the reducer gear group respectively, so that the motor and the reducer can be set relatively flexibly and power connection can be achieved through the motor shaft.

[0016] Optionally, the sensor assembly includes a guide protrusion, and the inner wall of the first shell is correspondingly provided with a guide slot extending in the axial direction, and the guide protrusion can be axially slidably arranged in the guide slot.

[0017] In this way, the guide protrusion and the guide groove cooperate to allow the sensor assembly to slide within the installation space, ensuring that the sensor assembly can achieve detection in the circumferential direction while having freedom in the axial direction, so that the tightening device will not squeeze the sensor assembly during use, avoiding the component force generated by the weight of the sensor assembly itself and the gravity of the power module to affect the torque, thereby ensuring the detection accuracy of the sensor assembly.

[0018] Optionally, there are multiple guide grooves and multiple guide protrusions, and the multiple guide grooves are distributed at equal angles along the circumference of the first shell, and the guide protrusion is arranged in each guide groove.

[0019] In this way, the multiple sets of guide protrusions and guide grooves cooperate stably, ensuring the accuracy of sensor component detection.

[0020] Optionally, the bearing assembly includes a first bearing and a second bearing, the first bearing is arranged between the first shell and the outer shell, and the second bearing is arranged between the second shell and the outer shell, wherein the first bearing is located at an end of the motor close to the reducer, and the second bearing is located at an end of the reducer away from the motor.

[0021] In this way, the two bearings disperse and absorb the vibration generated by the power module, greatly attenuating the vibration transmitted to the casing, thereby improving operating comfort and extending continuous operation time.

[0022] Optionally, 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 being connected by a coaxial stepped transition, wherein the outer diameter of the first connecting section is smaller than the outer diameter of the second connecting section, and an axial stepped surface is formed at the connection between the first connecting section and the second connecting section;

[0023] The second housing is sleeved on the first connecting section and forms a groove for limiting the first bearing between the second housing and the axial step surface.

[0024] In this way, a groove is formed by the axial stepped surface of the first housing and the axial cross-section of one end of the second housing, thereby achieving precise positioning of the first bearing during installation.

[0025] Optionally, the bearing assembly further includes a third bearing, which is disposed between the first housing and the outer shell and located at an end of the motor away from the reducer, and the third bearing cooperates with the first bearing to jointly support the motor.

[0026] In this way, more bearings can further disperse and absorb the vibration generated by the power module, greatly attenuating the vibration energy transmitted to the user's hand, thereby improving operating comfort and extending continuous operation time.

[0027] Optionally, the housing includes a first section, a second section, and a third section connected in sequence along the axial direction, the outer diameters of the first section, the second section, and the third section are 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 step structure, wherein the third bearing is installed in the third section, and the first bearing and the second bearing are both installed in the first section.

[0028] In this way, the consistency of the outer shell appearance is maintained, making the outer shell more convenient to hold, and the partitioned positioning of the bearing is achieved through the change of the inner diameter, which optimizes the internal space and makes the structure more compact and reasonable.

[0029] In a second aspect, an embodiment of the present application provides a tightening device, which includes any of the tightening devices described above.

[0030] The present application provides a tightening device and tightening apparatus. The tightening device includes a housing, a power module, and a sensor assembly. The housing includes a mounting space. The power module is disposed within the housing and includes a motor and a reducer that are dynamically connected. The power module also includes a module housing, and the motor shaft of the motor is dynamically connected to the input shaft of the reducer. The sensor assembly is disposed within the housing and is used to detect the torque of the motor. The sensor assembly is disposed within the mounting space, and the mounting space is larger than the sensor assembly in the axial direction of the motor, so that the sensor assembly can be slidably accommodated within the mounting space. The mounting space is disposed at an end of the motor away from the reducer, and the sensor assembly can be axially slidably mounted on the motor shaft of the motor. Thus, by providing the sensor assembly with axial freedom, the tightening device does not squeeze the sensor assembly during use, thereby ensuring the detection accuracy of the sensor assembly. Furthermore, by disposing the sensor assembly at the end of the motor away from the reducer, the sensor assembly can be placed close to the control circuit board, eliminating the need for the wiring harness to pass through the motor, thereby avoiding the influence of the magnetic field generated by the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A schematic cross-sectional view of a tightening device according to an embodiment of the present invention.

[0032] Figure 2 A schematic structural diagram of a tightening device provided in one embodiment of this specification.

[0033] Figure 3 Another cross-sectional structural schematic diagram of a tightening device provided in one embodiment of this specification.

[0034] Figure 4 Another structural schematic diagram of a tightening device provided in one embodiment of this specification.

[0035] Figure 5 Another cross-sectional structural diagram of a tightening device provided in one embodiment of this specification

[0036] Figure 6 This is another schematic cross-sectional view of the tightening device provided in one embodiment of this specification.

[0037] Figure 7 This is a schematic diagram of the exploded structure of a tightening device provided in one embodiment of this specification.

[0038] Figure 8 A schematic diagram of a module of a tightening device provided in one embodiment of this specification.

[0039] Description of Reference Numerals

[0040] 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 step surface; 60. Sensor assembly; 61. Guide protrusion; 62. Guide groove; 70. Control circuit board; 80. Wiring harness; 200. Tightening device. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of this specification will be clearly and completely described below in conjunction with the drawings in the embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this application, not all of the embodiments.

[0042] In this specification, the drawings are not necessarily drawn to scale, and local features may be enlarged or reduced to more clearly show details of the local features.

[0043] Unless otherwise indicated, all technical and scientific terms used in this specification have the same meaning as commonly understood by those skilled in the art in the technical field of this specification. The terms used in this specification are only for the purpose of describing specific embodiments and are not intended to limit the scope of this specification. The term "and / or" used in this specification includes any and all combinations of one or more of the relevant listed items. The singular forms "a", "above", and "the" used in this specification and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0044] 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 understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include one or more of the described features. In the description of this specification, "plurality" means two or more, unless otherwise specifically defined.

[0045] In the description of this specification, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "height", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and so on indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of simplifying the description of this specification, and do not indicate that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and should not be understood as a limitation to this application.

[0046] Throughout this specification, unless otherwise expressly defined, terms such as "installed," "connected," "connect," "fixed," and "disposed" should be interpreted broadly. For example, "connection" can refer to fixed or removable connections, or integration; mechanical or electrical connections; direct or indirect connections through an intermediary; or internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this specification based on the specific circumstances.

[0047] Currently, the core of tightening devices lies in their torque measurement and control systems. Mainstream products generally use torque sensors based on resistance strain gauges. This technology converts mechanical strain into a change in resistance, which is then converted to a measurable voltage signal by signal conditioning circuitry, ultimately calculating the real-time torque value. This measurement solution offers technical advantages such as fast response, high measurement accuracy, and excellent stability, and has become mature in the industrial field. However, in actual use, operators hold the tightening device to tighten fasteners at different locations on various structural components. During this process, the tightening device often changes position and posture repeatedly, for example, tightening fasteners vertically upward or downward, or horizontally or diagonally. As a result, when the tightening device is at different operating angles, the gravity component of the internal power components, such as the motor and reducer, is transmitted to the torque sensor through the mechanical structure, generating additional forces. Furthermore, the sensor's own weight also generates interference forces. These external forces, which are not in the torque direction, cause additional deformation of the strain gauge, resulting in distorted measurement signals. Furthermore, the torque sensor and circuit board are located on both sides of the motor and reducer. In this case, a wiring harness is required to transmit the torque sensor's signals to the circuit board. However, the motor generates a magnetic field during use, and the wiring harness will be affected by the magnetic field, causing further distortion of the measurement signal.

[0048] See also Figures 1 to 4 . The embodiment of the present application provides a tightening device 100, which includes a housing 10, a power module 20 and a sensor assembly 60. The housing 10 includes an installation space 14; the power module 20 is arranged in the housing 10, and the power module 20 includes a motor 21 and a reducer 22 that are connected together by power. The power module 20 also includes a module shell 23, and the motor shaft 212 of the motor 21 is connected to the input shaft 222 of the reducer 22 by power; the sensor assembly 60 is arranged in the housing 10 and is used to detect the torque of the motor 21; the sensor assembly 60 is arranged in the installation space 14, and in the axial direction of the motor 21, the size of the installation space 14 is larger than the size of the sensor assembly 60, so that the sensor assembly 60 can be slidably accommodated in the installation space 14; the installation space 14 is arranged at one end of the motor 21 away from the reducer 22, and the sensor assembly 60 can be axially slidably mounted on the motor shaft 212 of the motor 21.

[0049] In this embodiment, the tightening device 100 includes a housing 10, a power module 20, and a sensor assembly 60. The housing 10 includes a mounting space 14. The power module 20 is disposed within the housing 10 and includes a motor 21 and a reducer 22 that are connected together. The power module 20 also includes a module housing 23. The motor shaft 212 of the motor 21 is connected to the input shaft 222 of the reducer 22. The sensor assembly 60 is disposed within the housing 10 and is used to detect the torque of the motor 21. The sensor assembly 60 is disposed 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, so that the sensor assembly 60 can be slidably accommodated within the mounting space 14. The mounting space 14 is disposed at an end of the motor 21 away from the reducer 22, and the sensor assembly 60 can be axially slidably mounted on the motor shaft 212 of the motor 21. In this way, by providing the sensor assembly 60 with axial freedom, the tightening device 100 does not squeeze the sensor assembly 60 during use, thereby ensuring the detection accuracy of the sensor assembly 60. At the same time, the sensor assembly 60 is set at the end of the motor 21 away from the reducer 22, so that the sensor assembly 60 can be set close to the control circuit board 70, and the wiring harness 80 does not need to pass through the motor 21 to avoid being affected by the magnetic field generated by the operation of the motor 21.

[0050] 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 installation space 14 is larger than the size of the sensor assembly 60, so that the sensor assembly 60 can be slidably accommodated in the installation space 14. In other words, the sensor assembly 60 has a small gap space in the axial direction and can slide freely. The sensor assembly 60 will not be affected by the additional weight of the sensor assembly 60 itself and 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. The sensor assembly 60 can still detect the torque of the motor shaft 212 in the circumferential direction. The force on the sensor assembly 60 in the circumferential direction remains unchanged, so the torque detection accuracy of the sensor assembly 60 can be improved.

[0051] See also Figures 5 to 7 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 a side of the sensor assembly 60 away from the motor 21 , and the control circuit board 70 is connected to the sensor assembly 60 via the wiring harness 80 .

[0052] In this way, the control circuit board 70 can detect and accurately control the motor 21 to output appropriate torque through the sensor assembly 60 .

[0053] 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 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 instructions to adjust the output power of the motor 21 in real time to adjust the output torque of the tightening device 100.

[0054] Furthermore, the control circuit board 70 is disposed on the side of the sensor assembly 60 away from the motor 21. This effectively suppresses electromagnetic interference and vibration interference from the motor 21 during operation. At the same time, the signal transmission path from the sensor assembly 60 to the control circuit board 70 is shortened, significantly improving the system's anti-interference capability and response speed.

[0055] In some embodiments, the tightening device 100 further includes an output head 30 , which is at least partially disposed within the housing 10 and connected to the output shaft 223 of the reducer 22 . The motor 21 is configured to drive the output head 30 to rotate via the reducer 22 .

[0056] In this way, the motor 21 can realize the rotational tightening action of the fastener through the reducer 22 and the output head 30.

[0057] It is understandable that since the sensor assembly 60 and the control circuit board 70 are both arranged at the end of the motor 21 away from the reducer 22, that is, the sensor assembly 60 and the control circuit board 70 are arranged on the rear side of the tightening device 100, when connected through the wiring harness 80, there is no need for the wiring harness 80 to pass through the position of the motor 21, thereby avoiding the influence of the magnetic field of the motor 21. In this way, the output head 30, the reducer 22, the motor 21 and the sensor assembly 60 and the control circuit board 70 are arranged in sequence, making the tightening device 100 more compact, the spatial arrangement is more reasonable, and the influence between different components is smaller. At the same time, the front section of the tightening device 100 can also be set shorter, making the tightening device 100 of the embodiment of the present application more compact, thereby making the operator more labor-saving when using the tightening device 100.

[0058] In some embodiments, the tightening device 100 further includes a bearing assembly 40 disposed in the housing 10 . The bearing assembly 40 is disposed between the module housing 23 and the housing 10 , so that the power module 20 is rotatably connected to the housing 10 .

[0059] Thus, by connecting the housing of the power module 20 and the user's gripped housing 10 via the bearing assembly 40, the user's hand is less susceptible to vibration from the power module 20, thereby alleviating hand fatigue. Furthermore, when the motor 21 and reducer 22 drive the output head 30 to rotate, they reduce the impact of hand shaking on the precision of the tightening device 100, thereby improving the accuracy of the tightening device 100.

[0060] In an embodiment of the present application, the bearing assembly 40 is arranged between the power module 20 and the housing 10, so that the housing 10 is floatingly arranged on the power module 20, and the bearing assembly 40 can withstand the circumferential component of force, and the motor 21 and the reducer 22 will not affect the housing 10 during the rotation. Specifically, the inner ring and the outer ring of the bearing assembly 40 can rotate relative to each other, and when the power module 20 itself vibrates, a force along the circumferential direction is generated. The bearing assembly 40 can achieve the elimination of the circumferential force by rotating, and then form a buffer between the power module 20 and the housing 10, reducing the vibration frequency and amplitude of the user holding the housing 10. In this way, the housing of the power module 20 and the housing 10 held by the user are connected by the bearing assembly 40, and the vibration of the power module 20 to the hand is less, so as to relieve the fatigue of the user's hand. At the same time, the motor 21 and the reducer 22 reduce the influence of the user's hand shaking on the accuracy of the tightening device 100 in the process of driving the output head 30 to rotate, thereby improving the use accuracy of the tightening device 100.

[0061] Specifically, the motor 21 can convert electrical energy into mechanical energy, and the reducer 22 can reduce the rotation speed of the motor shaft 212 and increase the torque. The output head 30 is used to connect the reducer 22. The output shaft 223 of the reducer 22 can be precisely matched with the screw slot through the special geometric shape (such as cross, flat, hexagonal, etc.) at the front end of the output head 30 to ensure that there is no slippage during power transmission. The bearing assembly 40 can rotate and elastically support the housing 10. When the operator uses the tightening device 100 to perform screw assembly operations, it is necessary to continue to hold the housing 10 of the device. During the operation of the power module 20, in order to prevent the mechanical vibration generated by the high-speed rotation of the motor 21 and the gear meshing from being transmitted to the housing 10 through the rigid connection structure. In this embodiment, a bearing assembly 40 is provided between the power module 20 and the housing 10. As an intermediate medium for power transmission, the bearing assembly 40 not only ensures a reliable rotation connection between the power module 20 and the housing 10, but also 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, significantly reducing the amplitude of vibration in the operator's hands, especially during long-term continuous work, which can greatly reduce hand fatigue.

[0062] 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.

[0063] In this way, the first shell 211 and the second shell 221 can be used to protect the motor 21 group and the reducer 22 gear group respectively, so that the motor 21 and the reducer 22 can be set relatively flexibly and realize power connection through the motor shaft 212.

[0064] In this embodiment, the housing 10 of the tightening device 100 encloses the power module 20 and the bearing assembly 40, so that the power module 20 and the bearing assembly 40 are arranged in a relatively closed environment, thereby increasing the working stability of the power module 20 and the bearing assembly 40 and ensuring the performance of the power module 20 and the bearing assembly 40. 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 housing 10 of the motor 21, and the second housing 221 is the housing 10 of the reducer 22. The first housing 211 and the second housing 221 are connected together, so that the main parts of the motor 21 and the reducer 22 are arranged in a relatively closed environment, forming a relatively sealed transmission cavity, which not only ensures the reliability of power transmission, but also effectively isolates external dust and impurities from entering, thereby ensuring the performance of the power module 20.

[0065] In one embodiment, the first housing 211 and the second housing 221 may 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 may 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 the embodiment of the present application.

[0066] Specifically, the motor 21, the reducer 22, and the output head 30 are connected together in sequence, so that the power generated by the motor 21 can be transmitted to the reducer 22 and the output head 30 in sequence. Specifically, the motor shaft 212 of the motor 21 is connected to the input shaft 222 of the reducer 22, so that the power generated by the motor 21 can be transmitted to the input shaft 222 of the reducer 22 via the motor shaft 212, thereby causing the reducer 22 to operate and the power to be transmitted to the output shaft 223 of the reducer 22. At the same time, the output head 30 is at least partially disposed within the housing 10 and connected to the output shaft 223 of the reducer 22, so that the power generated by the rotation of the reducer 22 can be transmitted to the output head 30 via the output shaft 223 of the reducer 22. In this way, the motor 21 can drive the output head 30 to rotate through the reducer 22. A screwdriver bit can then be installed on the output head 30 to achieve efficient tightening and loosening operations on screws.

[0067] Furthermore, when the user uses the tightening device 100 to tighten and loosen the screws, the user needs to hold the housing 10 of the tightening device 100. At this time, the power module 20 of the tightening device 100 generates vibrations during operation and transmits the vibrations to the housing 10. In this embodiment, the bearing assembly 40 is arranged between the power module 20 and the housing 10, so that the power module 20 is rotatably connected to the housing 10, so that the vibrations generated by the power module 20 can be partially absorbed by the bearing assembly 40. In this way, the vibrations transmitted from the power module 20 to the housing 10 can be reduced, so that when the user uses the tightening device 100 to tighten and loosen the screws, the vibrations on the hand holding the housing 10 are reduced, thereby alleviating hand fatigue, improving operating comfort and extending continuous operation time.

[0068] See also Figures 5 to 7 In some embodiments, the sensor assembly 60 includes a guide protrusion 61 , and an inner wall of the first housing 211 is correspondingly provided with a guide slot 62 extending in the axial direction, and the guide protrusion 61 is axially slidably disposed in the guide slot 62 .

[0069] In this way, the guide protrusion 61 and the guide groove 62 cooperate so that the sensor assembly 60 can slide in the installation space 14, ensuring that the sensor assembly 60 can realize detection in the circumferential direction while having freedom in the axial direction, so that the tightening device 100 will not squeeze the sensor assembly 60 during use, avoiding the influence of the component force generated by the weight of the sensor assembly 60 itself and the gravity of the power module 20 on the torque, thereby ensuring the detection accuracy of the sensor assembly 60.

[0070] In some embodiments, there are multiple guide grooves 62 and multiple guide protrusions 61 , and the multiple guide grooves 62 are distributed at equal angles along the circumference of the first shell 211 , and a guide protrusion 61 is provided in each guide groove 62 .

[0071] In this way, the multiple groups of guide protrusions 61 and guide grooves 62 cooperate stably, ensuring the accuracy of detection by the sensor assembly 60.

[0072] In this embodiment, the sensor assembly 60 has axial freedom. Multiple sets of guide grooves 62 and guide protrusions 61 cooperate to ensure axial sliding freedom of the sensor assembly 60 while also enhancing circumferential positioning accuracy. The multiple guide mechanisms work together to effectively limit 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 points, ensuring precise and stable force transmission around the sensor assembly 60.

[0073] See also Figure 3 and Figure 4In some embodiments, the bearing assembly 40 includes a first bearing 41 and a second bearing 42, wherein the first bearing 41 is disposed between the first shell 211 and the housing 10, and the second bearing 42 is disposed between the second shell 221 and the housing 10, wherein the first bearing 41 is located at an end of the motor 21 close to the reducer 22, and the second bearing 42 is located at an end of the reducer 22 away from the motor 21.

[0074] In this way, the inner ring and outer ring of the first bearing 41 and the second bearing 42 can rotate relative to each other, thereby achieving the elimination of the circumferential force component. The two bearings disperse and absorb the vibration generated by the power module 20, so that the vibration transmitted to the outer casing 10 is greatly attenuated, thereby improving operating comfort and extending continuous operation time.

[0075] In this embodiment, the first bearing 41 is disposed outside the first housing 211 of the motor 21 at one end close to the reducer 22, and the second bearing 42 is disposed outside the second housing 221 of the reducer 22 at one end away from the motor 21. That is, the first bearing 41 is located outside the first housing 211 on one side of the motor shaft 212, primarily filtering and absorbing vibrations generated by the rotation of the motor 21, while the second bearing 42 is located outside the second housing 221 on the output side of the reducer 22, primarily absorbing vibrations generated by the gear transmission of the reducer 22. In this way, the first bearing 41 and the second bearing 42 can synergistically reduce vibrations, disperse and absorb the vibrations generated by the power module 20, and significantly attenuate the vibrations transmitted to the housing 10, thereby improving operating comfort and extending continuous operation time.

[0076] In this embodiment, the specific positions and sizes 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.

[0077] See also Figure 3 and Figure 5 In some embodiments, the first housing 211 includes a first connecting section 213 and a second connecting section 214 extending toward the reducer 22. The first connecting section 213 and the second connecting section 214 are connected using a coaxial stepped transition, wherein the outer diameter of the first connecting section 213 is smaller than the outer diameter of the second connecting section 214, and an axial stepped surface 51 is formed at the connection between the first connecting section 213 and the second connecting section 214; the second housing 221 is sleeved on the first connecting section 213, and a slot 50 for limiting the first bearing 41 is formed between the second housing 221 and the axial stepped surface 51.

[0078] In this way, 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 , thereby achieving precise positioning of the first bearing 41 during installation.

[0079] 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 stepped manner from low to high. In other words, the first connecting section 213 and the second connecting section 214 are connected by 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 with a smaller outer diameter can at least partially extend into the second housing 221, so that the outer wall of the first connecting section 213 and the inner wall of the second housing 221 are tightly fitted, forming a relatively sealed environment inside the first housing 211 and the second housing 221, thereby ensuring the operating stability of the power module 20. In addition, the motor shaft 212 of the motor 21 and the input shaft 222 of the reducer 22, as well as the coupling connecting the two shafts, can be arranged at the first connecting section 213 position to ensure transmission stability.

[0080] Furthermore, at least a portion of the first connecting section 213 extends into the second housing 221, and the exposed portion of the first connecting section 213 provides a mounting platform for the first bearing 41. Furthermore, the second connecting section 214 (with a larger outer diameter) and the first connecting section 213 (with a smaller outer diameter) are arranged in a stepped configuration, forming an axial step surface 51 at the junction of the first connecting section 213 and the second connecting section 214. The axial step 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 section 213, forms a retaining groove 50 for retaining the first bearing 41. In this way, the first bearing 41 can be mounted on the exposed portion of the first connecting section 213, with the mounting position of the first bearing 41 confined between the axial step surface 51 and the axial section of the second housing 221, thereby ensuring the installation accuracy of the first bearing 41.

[0081] See also 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 shell 10 and located at an end of the motor 21 away from the reducer 22 . The third bearing 43 cooperates with the first bearing 41 to support the motor 21 .

[0082] In this way, more bearings can further disperse and absorb the vibration generated by the power module 20, so that the vibration energy transmitted to the user's hand is greatly attenuated, thereby improving operating comfort and extending continuous operation time.

[0083] In this embodiment, the third bearing 43 is located outside the motor 21 housing, at an end away from the reducer 22. It cooperates with the first bearing 41 to further disperse and absorb vibrations generated by the motor 21 in the power module 20 during operation. Furthermore, the three bearings cooperate to further disperse and absorb vibrations generated by the power module 20 during operation, significantly attenuating the vibration energy transmitted to the user's hand, thereby improving operator comfort and extending continuous operation time.

[0084] It is understood that in order 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. The two bearings are respectively provided on both sides of the motor 21 to jointly support the motor 21 within the housing 10, allowing the motor 21 to rotate stably within the housing 10. At the same time, the three bearings are respectively provided on both sides and in the middle of the power module 20, jointly supporting the power module 20 within the housing 10, allowing the power module 20 to operate stably within the housing 10.

[0085] In some embodiments, because the sensor assembly 60 and the control circuit board 70 are both disposed on the rear side of the tightening device 100, one of the first bearing 41, the second bearing 42, and the third bearing 43 can be omitted to further shorten the axial length of the tightening device 100. In one example, the first bearing 41 and the second bearing 42 can be retained, while the third bearing 43 can be omitted; in another example, the second bearing 42 and the third bearing 43 can be retained, while the first bearing 41 can be omitted. The specific details are not limited herein.

[0086] See also Figure 6 In some embodiments, the housing 10 includes a first section 11, a second section 12, and a third section 13 connected in sequence along the axial direction. The outer diameters of the first section 11, the second section 12, and the third section 13 are equal, and the inner diameter of the second section 12 is smaller than the inner diameters of the first section 11 and the third section 13, forming a radial stepped structure, wherein the third bearing 43 is installed in the third section 13, and the first bearing 41 and the second bearing 42 are both installed in the first section 11.

[0087] In this way, the consistency of the appearance of the housing 10 is maintained, making it easier to hold the housing 10, and the partitioned positioning of the bearing is achieved through the change of the inner diameter, thereby optimizing the internal space and making the structure more compact and reasonable.

[0088] In this embodiment, the housing 10 adopts a three-section coaxial design with equal outer diameters, and a radial step structure is formed by changing the inner diameter. Specifically, the first section 11 and the third section 13 of the housing 10 have larger inner diameters, leaving a larger space inside the housing 10 for the installation of bearings. The second section 12 has a smaller inner diameter, forming a radial limit inside the housing 10, which is used to separate the first section 11 and the second section 12. The larger inner diameter of the third section 13 leaves space for the installation of the third bearing 43, which is installed separately in the third section 13. The larger inner diameter of the first section 11 leaves space for the installation of the first bearing 41 and the second bearing 42, which are both installed in the first section 11. This design, while maintaining the regular and uniform appearance of the housing 10, uses the inner cavity step structure to achieve precise positioning and reasonable layout of the bearings, ensuring the installation accuracy and load-bearing performance of each bearing, and optimizing the internal space allocation, making the overall structure more compact.

[0089] See also Figures 3 to 7 In some embodiments, the tightening device 100 further includes a sensor assembly 60 , which is disposed within the housing 10 and configured to detect torque at an output end of the output head 30 .

[0090] 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 accurate collection and real-time feedback of torque data are achieved, so that the operator can accurately control the force.

[0091] In the present embodiment, when the tightening device 100 is working, the motor 21 rotates and transmits power to the reducer 22 and the output head 30 in sequence, wherein the reducer 22 reduces the transmission speed and increases the rotational torque through the transmission assembly inside it. At the same time, a screwdriver head is installed on the output head 30 to be used for tightening or loosening the screw. In actual operation, the installation torque required for different screws may be different. In this way, the sensor assembly 60 is provided in the tightening device 100 to detect the torque at the output end of the output head 30, so that the tightening assembly can provide more accurate torque for the screw that needs to be tightened or loosened in actual operation. In this way, the sensor assembly 60 is directly built into the interior of the housing 10, which not only effectively protects the precision sensing element from the influence of the external environment, but also realizes the accurate collection and real-time feedback of torque data, so that the operator can accurately control the tightening force.

[0092] See also Figure 6 In some embodiments, the housing 10 further includes an installation space 14 , in which the sensor assembly 60 is disposed. In the axial direction of the motor 21 , the size of the installation space 14 is larger than the size of the sensor assembly 60 , so that the sensor assembly 60 can be slidably accommodated in the installation space 14 .

[0093] Therefore, the sensor assembly 60 has axial freedom, so that the tightening device 100 does not squeeze the sensor assembly 60 during use, avoiding the influence of the weight of the sensor assembly 60 and the component force of the gravity of the power module 20 on the torque, to ensure the detection accuracy of the sensor assembly 60.

[0094] In the embodiment, the size of the installation space 14 in the axial direction (i.e. the direction of the main shaft of the motor 21) is accurately designed to have a proper gap with the size of the sensor assembly 60, forming a small adjustable gap. The carefully designed size matching relationship enables the sensor assembly 60 to achieve a small but accurate sliding displacement in the axial direction. In the embodiment, the size of the installation space 14 in the axial direction is not limited to be greater than the size of the sensor assembly 60 to meet different needs. In an embodiment, the installation space 14 forms a 0.5-2mm adjustable gap with the size of the sensor assembly 60. For example, the installation space 14 can have a 0.5mm, 1mm, 1.5mm, or 2mm adjustable gap with the size of the sensor assembly 60.

[0095] This provides the sensor assembly 60 with axial freedom, ensuring that the sensor assembly 60 is not rigidly squeezed by the housing 10 during the operation of the tightening device 100; secondly, effectively isolates the influence of the component force of the weight of the sensor assembly 60 and the gravity of the power module 20 in the axial direction, avoiding the interference of these external forces on the torque measurement accuracy. In addition, this floating installation method can compensate for the small size errors generated during manufacturing and assembly, ensuring that the sensor assembly 60 is always in the best working state.

[0096] Please refer to Figure 6 and Figure 7 In some embodiments, the installation space 14 is arranged at the end of the motor 21 away from the speed reducer 22, and the sensor assembly 60 is axially slidably sleeved on the motor shaft 212 of the motor 21.

[0097] Therefore, the sensor assembly 60 is arranged at the rear side of the tightening device 100, the sensor assembly 60 is connected to the motor shaft 212 to detect the torque of the motor shaft 212, and the sensor assembly 60 is arranged at the rear side to be closer to the control circuit board 70, and also avoids the wire harness 80 passing through the motor 21, to avoid the magnetic field generated by the operation of the motor 21 affecting the wire harness 80, and then affecting the signal of the sensor assembly 60. In this way, the rear placement of the sensor assembly 60 can make the front section of the tightening device 100 shorter, with high space utilization and compact structure.

[0098] In this embodiment, the sensor assembly 60 can be axially slidably mounted on the motor shaft 212 of the motor 21, achieving a compact layout and saving installation space 14. At the same time, the motor shaft 212 can directly feedback the actual torque of the motor shaft 212 to the sensor assembly 60, thereby improving the accuracy of the torque collected by the sensor assembly 60. The installation space 14 provides axial freedom for the sensor assembly 60, ensuring that the sensor assembly 60 will not be subjected to rigid extrusion from the housing 10 during the operation of the tightening device 100; secondly, it effectively isolates the influence of the axial force generated by the self-weight of the sensor assembly 60 and the gravity of the power module 20, thereby avoiding interference of these external forces on the torque measurement accuracy. In addition, this floating installation method can compensate for minor dimensional errors generated during the manufacturing and assembly process, ensuring that the sensor assembly 60 is always in the best working state. In addition, since the sensor assembly 60 can slide axially relative to the motor shaft 212, it can compensate for assembly errors and reduce the impact of vibration on the sensor assembly 60.

[0099] In some embodiments, to achieve a more compact tightening device 100, the sensor assembly 60 can be positioned rearward, the front section of the tightening device 100 can be shortened, and one of the first bearing 41 and the third bearing 43 can be removed to further shorten the tightening device 100.

[0100] In some embodiments, the first housing 211 and the second housing 221 are integrally formed, thereby eliminating the assembly gap of the traditional split structure and significantly improving the overall structural strength and sealing performance.

[0101] In this embodiment, the first housing 211 and the second housing 221 can be integrally formed through a casting or injection molding process, forming a single, integrated structure with no assembly gaps. This eliminates the assembly gaps typically associated with traditional split-body structures, significantly improving overall structural strength and sealing performance, optimizing the force transmission path, reducing the number of parts, and lowering assembly complexity.

[0102] See also Figure 8 The embodiment of the present application further provides a tightening device 200 , which includes any one of the tightening devices 100 described above.

[0103] In the embodiments of the present application, 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, and the tightening device 200 can be a machine tool or operating table equipped with the tightening device 100 of the embodiment of the present application. The tightening device 200 can have all the technical features and technical effects of the tightening device 100 described above, so that the tightening device 200 has less vibration during operation, has good operational stability and service life, and improves the user experience.

[0104] In the above embodiments, the description of each embodiment is focused on, and the part not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0105] The functions and effects of the present embodiment can be explained by reference to the foregoing embodiments, and will not be described again.

[0106] It can be understood that, in various embodiments in the present specification, the size of the sequence number of each process does not mean the order of execution, and the execution order of each process should be determined according to its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present specification.

[0107] It can be understood that the various embodiments described in the present specification can be implemented alone or in combination, and the embodiments of the present specification do not limit this.

[0108] Those skilled in the art can clearly understand that, for the convenience and brevity of the description, the specific working process of the system, device and unit described above can refer to the corresponding process in the foregoing method embodiments, which will not be described again here.

[0109] The above is only a specific embodiment of the present specification, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present specification, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A tightening device, characterized in that: include: housing, including mounting space; A power module disposed in the housing includes a motor and a reducer that are dynamically connected together, the power module further including a module housing, and a motor shaft of the motor is dynamically connected to an input shaft of the reducer; a sensor assembly disposed in the housing and configured to detect the torque of the motor; the sensor assembly being disposed in the mounting space, and having a size larger than that of the sensor assembly in the axial direction of the motor, such that the sensor assembly is slidably accommodated in the mounting space; The installation space is arranged at an end of the motor away from the reducer, and the sensor assembly is axially slidably mounted on the motor shaft of the motor.

2. The tightening device according to claim 1, characterized in that The tightening device further includes an output head, which is at least partially disposed in the housing and connected to the output shaft of the reducer. The motor is used to drive the output head to rotate through the reducer.

3. The tightening device according to claim 1, characterized in that The tightening device further includes a control circuit board and a wiring harness. The control circuit board is arranged on a side of the sensor assembly away from the motor, and the control circuit board is connected to the sensor assembly through the wiring harness.

4. The tightening device according to claim 1, characterized in that The tightening device further includes a bearing assembly disposed in the housing. The bearing assembly is disposed between the module housing and the housing, so that the power module is rotatably connected to the housing.

5. The tightening device according to claim 4, characterized in that: The module housing includes a first housing and a second housing, the first housing is the housing of the motor, the second housing is the housing of the reducer, and the first housing and the second housing are connected together.

6. The tightening device according to claim 5, characterized in that The sensor assembly includes a guide protrusion, and the inner wall of the first shell is correspondingly provided with a guide slot extending in the axial direction, and the guide protrusion can be axially slidably arranged in the guide slot.

7. The tightening device according to claim 6, characterized in that There are multiple guide slots and multiple guide protrusions, and the multiple guide slots are distributed at equal angles along the circumference of the first shell. The guide protrusion is cooperatively arranged in each guide slot.

8. The tightening device according to claim 5, characterized in that: The bearing assembly includes a first bearing and a second bearing, the first bearing is arranged between the first shell and the outer shell, and the second bearing is arranged between the second shell and the outer shell, wherein the first bearing is located at an end of the motor close to the reducer, and the second bearing is located at an end of the reducer away from the motor.

9. The tightening device according to claim 8, characterized in that: The first housing includes a first connecting section and a second connecting section extending toward the reducer, wherein the first connecting section and the second connecting section are connected by a coaxial stepped transition, wherein the outer diameter of the first connecting section is smaller than the outer diameter of the second connecting section, and an axial stepped surface is formed at the connection between the first connecting section and the second connecting section; The second housing is sleeved on the first connecting section and forms a groove for limiting the first bearing between the second housing and the axial step surface.

10. The tightening device according to claim 8, characterized in that The bearing assembly further includes a third bearing, which is disposed between the first housing and the outer shell and located at an end of the motor away from the reducer. The third bearing cooperates with the first bearing to jointly support the motor.

11. The tightening device according to claim 10, characterized in that: The housing includes a first section, a second section, and a third section connected in sequence along the axial direction. The outer diameters of the first section, the second section, and the third section are 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 step structure, wherein the third bearing is installed in the third section, and the first bearing and the second bearing are both installed in the first section.

12. A tightening device, characterized in that: A tightening device comprising the tightening device according to any one of claims 1 to 11.

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