Impact tool and rotary power tool

Abstract

The invention discloses an impact tool and a rotary power tool, and the impact tool comprises a housing which is provided with an accommodating space; a motor including a drive shaft rotating about a first axis; the output shaft is used for outputting torque outwards; the impact mechanism is used for applying impact force to the output shaft; the impact mechanism comprises an impact block driven by the motor and a hammer anvil matched with the impact block and impacted by the impact block; a controller for controlling the motor; the detection assembly comprises a first sensor and a second sensor, and the first sensor is formed or connected to the output shaft to measure the rotation angle of the output shaft relative to the working surface; a second sensor is formed or connected to the housing to measure a rotational angle of the housing relative to the working surface, the first sensor and the second sensor respectively or together generating an output signal, the output signal being sent to a controller. According to the invention, the consistency of the output torque and the preset torque can be ensured.

Description

Technical Field

[0001] This application relates to a power tool, and more particularly to an impact tool and a rotary power tool. Background Art

[0002] In daily production and life, scenarios such as drilling, screwing bolts or nuts are often encountered. During this process, rotary power tools such as impact tools are usually used. An impact tool refers to a tool that can output a rotary motion at a certain impact frequency. Impact tools generally include an output component for outputting a rotary force and an impact component for periodically impacting the output component. Common impact tools include impact wrenches, impact screwdrivers, impact drills, etc. Impact wrenches are usually used for screwing bolts and nuts, etc., impact screwdrivers are usually used for screwing screws, etc., and impact drills are usually used for impact drilling.

[0003] In the prior art, it is necessary to set the output torque of the impact tool to ensure the consistency of fastening. However, existing impact tools can only roughly set the output torque and cannot ensure the stability of the actual output torque. Summary of the Invention

[0004] One object of this application is to solve or at least mitigate some or all of the above problems. To this end, one object of this application is to provide an impact tool.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] An impact tool, comprising:

[0007] A housing provided with a receiving space;

[0008] A motor including a drive shaft that rotates about a first axis;

[0009] An output shaft for outputting torque externally;

[0010] An impact mechanism for applying an impact force to the output shaft; the impact mechanism includes an impact block driven by the motor and an anvil that cooperates with the impact block and is impacted by the impact block;

[0011] A controller for controlling the motor;

[0012] A detection assembly including a first sensor and a second sensor. Wherein, the first sensor is formed or connected to the output shaft to measure the rotation angle of the output shaft relative to the work surface;

[0013] The second sensor is formed or connected to the housing to measure the rotation angle of the housing relative to the work surface. The first sensor and the second sensor generate output signals separately or jointly, and the output signals are sent to the controller.

[0014] In some embodiments, a first target member is further included. The first target member moves with the output shaft according to a preset rule. The first sensor is configured to detect the rotation angle of the first target member.

[0015] In some embodiments, the first target member includes a first gear. The first gear is connected to the output shaft. A second gear is rotatably disposed on the housing, and the second gear is in transmission connection with the first gear. The first sensor is configured to detect the rotation angle of the second gear.

[0016] In some embodiments, the diameter of the first gear is larger than the diameter of the second gear.

[0017] In some embodiments, the first sensor is a magnetic encoder. A magnetic member is disposed at an end of the second gear. The first sensor is disposed in cooperation with the magnetic member.

[0018] In some embodiments, the second sensor is a gyroscope.

[0019] In some embodiments, the first target member includes a first gear. The first gear is connected to the output shaft. A second gear and a third gear are both rotatably disposed on the housing, and both the second gear and the third gear are in transmission connection with the first gear. Two first sensors are provided. The two first sensors are configured to detect the rotation angles of the second gear and the third gear respectively.

[0020] In some embodiments, the diameter of the first gear is larger than the diameter of the second gear, and the diameter of the first gear is larger than the diameter of the third gear.

[0021] In some embodiments, the number of teeth of the second gear is not consistent with the number of teeth of the third gear.

[0022] In some embodiments, the first target member includes a toothed structure with protrusions on the output shaft. The first sensor is configured to detect the rotation angle of the toothed structure.

[0023] In some embodiments, the first sensor is an angle sensor. A circuit board assembly is disposed on the outer periphery of the toothed structure. The first sensor is disposed on the circuit board assembly.

[0024] In some embodiments, a circuit board assembly is disposed on the outer periphery of the toothed structure. The second sensor is a gyroscope. The gyroscope is disposed on the circuit board assembly.

[0025] An impact tool, comprising:

[0026] A housing is provided with a receiving space;

[0027] A motor includes a drive shaft that rotates about a first axis;

[0028] An output shaft is used to output torque externally;

[0029] An impact mechanism is used to apply an impact force to the output shaft; the impact mechanism includes an impact block driven by the motor and an anvil that cooperates with the impact block and is impacted by the impact block;

[0030] A controller is used to control the motor;

[0031] A detection component detects the rotation angle of the output shaft relative to the housing and generates an output signal, and the output signal is sent to the controller.

[0032] A rotary power tool includes:

[0033] A housing is provided with a receiving space;

[0034] A motor includes a drive shaft that rotates about a first axis;

[0035] An output shaft is used to output torque externally, and the output shaft rotates about an output axis;

[0036] A controller is used to control the motor;

[0037] A detection component detects the rotation angle of the output shaft relative to the housing and generates an output signal, and the output signal is sent to the controller.

[0038] The advantages of the present application are as follows:

[0039] An impact tool provided by the present application has a housing with a receiving space. The motor includes a drive shaft. The motor can drive an impact block and an anvil that cooperates with the impact block and is impacted by the impact block, thereby driving the output shaft to output torque externally. The motor is controlled by a controller. A first sensor is formed on or connected to the output shaft, and the first sensor is used to measure the rotation angle of the output shaft relative to the working surface. A second sensor is formed or connected to the housing, and the second sensor can measure the rotation angle of the housing relative to the working surface. The first sensor and the second sensor respectively or jointly generate an output signal, and the output signal is sent to the controller. By measuring the rotation angle of the output shaft relative to the working surface with the first sensor and the rotation angle of the housing relative to the working surface with the second sensor, the controller obtains the absolute rotation angle of the output shaft through function calculation, thereby obtaining the actual output torque of the impact tool. Further, by controlling the motor through the controller, the consistency between the output torque and the preset torque can be ensured. Description of the Drawings

[0040] Figure 1 It is a schematic diagram of an impact tool;

[0041] Figure 2 It is an electrical schematic diagram of an impact tool;

[0042] Figure 3 It is another schematic diagram of an impact tool;

[0043] Figure 4 It is a cross-sectional view of a partial structure of an impact tool;

[0044] Figure 5 It is a transmission schematic diagram of a first gear, a second gear and a third gear in an impact tool;

[0045] Figure 6 It is another transmission schematic diagram of a first gear, a second gear and a third gear in an impact tool;

[0046] Figure 7 It is an exploded schematic diagram of a circuit board assembly located in a motor housing of an impact tool;

[0047] Figure 8 It is an exploded schematic diagram of a circuit board assembly located in a drive housing of an impact tool;

[0048] Figure 9 It is yet another schematic diagram of an impact tool.

[0049] In the figure:

[0050] 100, impact tool; 101, first axis; 102, second axis; 11, housing; 111, output housing; 1111, accommodation part; 1112, cover body; 1113, support hole; 112, motor housing; 1121, lower convex groove body; 1122, upper convex groove body; 113, holding part; 114, clamping part; 1141, clamping groove; 12, motor; 121, drive shaft; 13, output mechanism; 131, output shaft; 132, clamping assembly; 14, transmission mechanism; 15, impact mechanism; 151, main shaft; 152, impact block; 153, anvil; 1531, anvil seat; 154, elastic element; 155, ball; 16, switch button; 161, switching part; 17, controller; 171, drive circuit; 18, detection assembly; 181, first sensor; 182, second sensor; 183, camera; 20, circuit board assembly; 201, wire; 30, power supply; 2, first target part; 21, first gear; 22, tooth structure; 3, second gear; 31, first bearing; 32, first rotating shaft; 4, third gear; 41, second bearing; 42, second rotating shaft. Detailed implementation manners

[0051] Before explaining any embodiments of the present application in detail, it should be understood that the present application is not limited to the structural details and component arrangements set forth in the following description or shown in the above drawings.

[0052] In the present application, the terms "comprising", "including", "having" or any other variants thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0053] In the present application, the term "and / or" describes the association relationship of associated objects and indicates that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, in the present application, the character " / " generally indicates that the associated objects before and after are in an "and / or" relationship.

[0054] In the present application, the terms "connected", "combined", "coupled", "installed" may be direct connection, combination, coupling or installation, or may be indirect connection, combination, coupling or installation. Among them, by way of example, direct connection means that two parts or components are connected together without the need for an intermediate member, and indirect connection means that two parts or components are respectively connected to at least one intermediate member, and these two parts or components are connected through the intermediate member. In addition, "connection" and "coupling" are not limited to physical or mechanical connection or coupling, and may include electrical connection or coupling.

[0055] In the present application, those of ordinary skill in the art will understand that relative terms used in combination with quantities or conditions include the stated value and have the meaning indicated by the context. For example, such relative terms at least include the degree of error associated with the measurement of a specific value, tolerances caused by manufacturing, assembly, use, etc. associated with a specific value. Such terms should also be considered to disclose a range defined by the absolute values of two endpoints. Relative terms may refer to plus or minus a certain percentage of the indicated value. Numerical values without the use of relative terms should also be disclosed as specific values with tolerances. In addition, when expressing a relative angular position relationship, "substantially" may refer to plus or minus a certain number of degrees based on the indicated angle.

[0056] In the present application, those of ordinary skill in the art will understand that the functions performed by components may be performed by one component, multiple components, one part, or multiple parts. Similarly, the functions performed by parts may also be performed by one part, one component, or a combination of multiple parts.

[0057] In this application, the orientation terms such as "upper", "lower", "left", "right", "front", and "back" are described based on the orientation and positional relationship shown in the drawings, and should not be construed as a limitation on the embodiments of this application. In addition, in the context, it should also be understood that when it is mentioned that one component is connected "above" or "below" another component, it can not only be directly connected "above" or "below" another component, but also be indirectly connected "above" or "below" another component through an intermediate component. It should also be understood that the orientation terms such as the upper side, the lower side, the left side, the right side, the front side, and the back side not only represent the positive orientation, but can also be understood as the side orientation. For example, the lower side can include directly below, lower left, lower right, lower front, and lower back, etc.

[0058] In this application, the terms "device", "module", or "unit" can be implemented in the form of hardware or software in order to achieve specific functions.

[0059] In this application, the terms "calculate", "judge", "control", "determine", "identify", etc. refer to the operations and processes of a computer system or a similar electronic computing device.

[0060] As Figures 1-3 shown, a rotary power tool according to an embodiment of this application. In this embodiment, an impact tool 100 is provided, and the impact tool 100 is an impact wrench. It can be understood that in other alternative embodiments, the impact tool 100 can be installed with different working attachments, and through these different working attachments, the impact tool 100 can be an impact drill, an impact screwdriver, etc. In some embodiments, the rotary power tool includes power tools such as an electric drill and a screwdriver that output power and torque through rotation.

[0061] In this embodiment, the impact wrench includes a power supply 30 for supplying electrical energy to the impact wrench. In some embodiments, the impact wrench is powered by a DC power supply. In this embodiment, the power supply 30 is a battery pack, and the battery pack cooperates with a corresponding power circuit to supply power to the electrical components in the impact wrench. Those skilled in the art should understand that the power supply is not limited to the scenario of using a battery pack, and can also be powered by mains electricity, an AC power supply, or a mixture of mains electricity and a battery pack, and cooperate with corresponding rectification, filtering, and voltage regulation circuits to supply power to each circuit component.

[0062] The impact wrench includes a housing 11, a motor, an output mechanism 13, a transmission mechanism 14, and an impact mechanism 15. Among them, the motor includes a drive shaft 121 that rotates around a first axis 101. In some embodiments, the motor is specifically set as an electric motor 12, and hereinafter the electric motor 12 will be used instead of the motor, but it should not be construed as a limitation on this application.

[0063] Among them, the housing 11 includes a motor housing 112 for accommodating the motor 12 and an output housing 111 for accommodating at least a part of the output mechanism 13. The output housing 111 is connected to the front end of the motor housing 112. The housing 11 also forms or is connected with a holding part 113 for user operation. The holding part 113 and the motor housing 112 form a T-shaped or L-shaped structure, which is convenient for the user to hold and operate. One end of the holding part 113 is connected with a battery pack. The battery pack is detachably connected to the holding part 113.

[0064] The output mechanism 13 includes an output shaft 131 for connecting a working accessory and driving the working accessory to rotate. A clamping assembly 132 is provided at the front end of the output shaft 131, which can clamp the corresponding working accessory when realizing different functions, such as a screwdriver, a drill bit, a socket, etc. The output shaft 131 is used to output power, and the output shaft 131 rotates around the output axis. In some embodiments, the output axis is the second axis 102. In some embodiments, the first axis 101 coincides with the second axis 102. In other alternative embodiments, the second axis 102 is arranged at a certain angle with respect to the first axis 101. In other alternative embodiments, the first axis 101 and the second axis 102 are parallel to each other but do not coincide.

[0065] The transmission mechanism 14 is arranged between the motor 12 and the impact mechanism 15. In this embodiment, the transmission mechanism 14 adopts planetary gear reduction. Since the working principle of planetary gear reduction and the reduction generated by this transmission mechanism 14 have been fully disclosed to those skilled in the art, the detailed description is omitted here for the purpose of simplicity of the specification.

[0066] As Figure 4 shown, the impact mechanism 15 is used to provide an impact force to the output shaft 131. The impact mechanism 15 includes a main shaft 151, an impact block 152 sleeved on the outer periphery of the main shaft 151, an anvil 153 arranged at the front end of the impact block 152, and an elastic element 154. Among them, the anvil 153 is connected to the output shaft 131, and the transmission mechanism 14 is used to realize the power transmission between the drive shaft 121 and the main shaft 151. In some embodiments, the anvil 153 includes an anvil base 1531, and the output shaft 131 is formed at the front end of the anvil base 1531. It can be understood that the anvil base 1531 and the output shaft 131 can be integrally formed or formed as separate independent parts. The impact block 152 is driven by the main shaft 151, and the anvil 153 cooperates with the impact block 152 and is struck by the impact block 152.

[0067] The impact block 152 includes an impact block body, and a pair of first end teeth are radially symmetrically convex on the front end face of the impact block body. A pair of second end teeth are radially symmetrically convex on the rear end face of the anvil base 1531 opposite to the impact block 152.

[0068] The output shaft 131 extends out of the output housing 111. The impact block 152 is supported on the main shaft 151 and rotates integrally with the main shaft 151, and the impact block 152 can reciprocate relative to the main shaft 151 in the axial direction of the main shaft 151. In some embodiments, the axis of the main shaft 151 coincides with the axis of the motor shaft. Therefore, the impact block 152 reciprocates and rotates relative to the main shaft 151 along the direction of the first axis 101. In other alternative embodiments, the axis of the main shaft 151 can be parallel to the first axis 101 but not coincide.

[0069] The elastic element 154 provides a force for the impact block 152 to move it closer to the anvil 153. In some embodiments, the elastic element 154 is a helical spring. During the operation of the impact wrench, the impact block 152 reciprocates back and forth relative to the main shaft 151 in the direction of the first axis 101 with a specified stroke while rotating integrally with the main shaft 151. A pair of first ball grooves that open forward and extend backward in the front-rear direction are also provided on the front end face of the impact block body. A pair of V-shaped second ball grooves are also formed on the outer surface of the main shaft 151. The impact mechanism 15 further includes rolling balls 155. The rolling balls 155 straddle the first ball grooves and the second ball grooves, so that the impact block 152 is connected to the main shaft 151 and moves together. In some embodiments, the rolling balls 155 are steel balls.

[0070] As Figure 2 shown, the controller 17 is used to control the motor 12. The controller 17 is arranged on the control circuit board, and the control circuit board includes: a printed circuit board and a flexible circuit board. The controller 17 employs a dedicated control chip, for example, a single-chip microcomputer, a micro control module. The controller 17 specifically controls the on or off state of the switching elements in the drive circuit 171 through the control chip. In some embodiments, the controller 17 controls the ratio between the on time and the off time of the drive switch based on a pulse width modulation signal.

[0071] The drive circuit 171 is connected to the motor 12. In this embodiment, the motor 12 is a three-phase brushless motor, including a rotor with permanent magnets and three-phase stator windings U, V, W that are commutated electronically. In some embodiments, the three-phase stator windings U, V, W are connected in a star connection, and in other embodiments, the three-phase stator windings U, V, W are connected in a delta connection. However, it must be understood that other types of brushless motors are also within the scope of the present disclosure. The brushless motor may include less than or more than three phases. The drive circuit 171 is electrically connected to the stator windings U, V, W of the motor 12 for transmitting the current from the battery pack to the stator windings U, V, W to drive the motor 12 to rotate. In one embodiment, the drive circuit 171 includes a plurality of switching elements. The gate terminal of each switching element is electrically connected to the controller 17 for receiving a control signal from the controller 17. The drain or source of each switching element is connected to the stator windings U, V, W of the motor 12.

[0072] In the related art, it is known that when the duty ratio of the drive signal of the motor 12 is fixed, the greater the load on the output shaft 131, the smaller the rotation angle of the output shaft 131. Therefore, the output torque of the output shaft 131 can be characterized by detecting the rotation angle of the output shaft 131 or obtained through function calculation. However, in related products, because the machine will vibrate, shake or swing during the use of the impact wrench, when adopting the scheme of directly measuring the rotation angle of the output shaft 131 relative to the outside world, the rotation angle data of the output shaft 131 obtained will be interfered by the rotation angle of the whole impact wrench, resulting in the measured data not being the angle change of the output shaft 131 due to the load. As a result, the calculated torque is inaccurate, the actual output torque cannot be accurately measured, and thus the consistency between the output torque and the preset torque cannot be ensured.

[0073] As Figures 1-9 shown, to solve the above problems, the impact tool 100 provided in the present application further includes a detection assembly 18, and the detection assembly 18 includes a first sensor 181 and a second sensor 182. Among them, the first sensor 181 is formed or connected to the output shaft 131 to measure the rotation angle of the output shaft 131 relative to the working surface. The second sensor 182 is formed or connected to the housing 11 to measure the rotation angle of the housing 11 relative to the working surface. The first sensor 181 and the second sensor 182 generate output signals separately or jointly, and the output signals are sent to the controller 17.

[0074] By measuring the rotation angle of the output shaft 131 relative to the working surface with the first sensor 181 and the rotation angle of the output housing 111 relative to the working surface with the second sensor 182, the controller 17 obtains the absolute rotation angle of the output shaft 131 through function calculation, so as to obtain the actual output torque of the impact tool 100. Further, by controlling the motor through the controller 17, the consistency between the output torque and the preset torque can be ensured. Calculating the output torque through the rotation angle is a prior art and will not be elaborated here.

[0075] As Figure 1 shown, in some embodiments, a switch button 16 is provided on the housing 11. The switch button 16 is electrically connected to the controller 17. By pressing the switch button 16, the start and stop of the motor 12 are controlled. During use, the operator needs to continuously hold down the switch button 16 for the impact tool 100 to continue working. As long as the switch button 16 is released, the impact tool 100 will stop working, saving electric energy and protecting the operator at the same time. In some embodiments, a switching part 161 is further included, and the switching part 161 is used to set the rotation direction of the motor 12 to the forward rotation direction for tightening the fastener or the reverse rotation direction for loosening the fastener.

[0076] In some embodiments, the impact tool 100 further includes a first target member 2, and the first target member 2 moves in accordance with a preset rule with the output shaft 131. In some embodiments, the output shaft 131 and the first target member 2 rotate synchronously. In some embodiments, the first target member 2 rotates at N times the rotational speed of the output shaft 131, where N>0. In some embodiments, the first sensor 181 is used to detect the rotation angle of the first target member 2. The first target member 2 can be fixed to the output shaft 131 and thus rotates in accordance with a preset rule with the output shaft 131. The first sensor 181 can obtain the rotation angle of the output shaft 131 by measuring the rotation angle of the first target member 2. By providing the first target member 2, the acquisition range of the first sensor 181 is increased, thus facilitating the arrangement of the first sensor 181.

[0077] In some embodiments, as Figure 5 shown, the first target member 2 includes a first gear 21, and the first gear 21 is connected to the output shaft 131. The second gear 3 is rotatably disposed on the housing 11, and the second gear 3 is in transmission connection with the first gear 21. The first sensor 181 is used to detect the rotation angle of the second gear 3. A first bearing 31 is fixedly provided on the housing 11, and an inner ring of the first bearing 31 is fixedly connected to a first rotating shaft 32. The second gear 3 is fixedly connected to the first rotating shaft 32. The second gear 3 can be directly meshed with the first gear 21, and the second gear 3 is driven to rotate by the first gear 21. The first sensor 181 acquires the rotation angle of the second gear 3, and then the rotation angle of the first gear 21 can be obtained through conversion based on the transmission ratio of the first gear 21 and the second gear 3, so as to obtain the rotation angle of the output shaft 131.

[0078] In some embodiments, a number of intermediate gears meshing with each other can also be arranged between the first gear 21 and the second gear 3. The first gear 21 drives the second gear 3 to rotate through a number of intermediate gears. The number of intermediate gears can be 1, 2, 3... There is no excessive limitation here, and only the corresponding number of intermediate gears needs to be arranged according to actual installation requirements. The first sensor 181 acquires the rotation angle of the second gear 3, and then the rotation angle of the first gear 21 can be obtained through conversion based on the transmission ratio of the first gear 21 and the second gear 3, so as to obtain the rotation angle of the output shaft 131. Through the above arrangement, the position where the first sensor 181 is arranged can be far away from the output shaft 131, thus facilitating the arrangement of the first sensor 181. In some embodiments, a chain drive form or a synchronous belt drive form can also be adopted, and there is no excessive limitation here.

[0079] In some embodiments, the diameter of the first gear 21 is larger than that of the second gear 3. By using the larger-diameter first gear 21 to drive the smaller-diameter second gear 3, the second gear 3 can amplify the rotation of the first gear 21. Even if the rotation angle of the first gear 21 is small, after being amplified by the second gear 3, it can ensure that the first sensor 181 accurately collects data, thereby improving the accuracy of the rotation angle collected by the first sensor 181.

[0080] In some embodiments, as Figure 6 shown, the first sensor 181 is a magnetic encoder, and a magnetic member is provided at the end of the second gear 3. The first sensor 181 is arranged in cooperation with the magnetic member. By collecting the rotation of the magnetic member, the magnetic encoder can obtain the rotation angle of the second gear 3. Moreover, the magnetic encoder adopts the Hall principle and uses a magnetic detection method, which has excellent anti-shock and vibration characteristics. During the operation of the impact tool 100, it can still well meet the requirements of angle measurement. In some other embodiments, the first sensor 181 can also adopt an optical encoder, which will not be limited here too much.

[0081] In some embodiments, the second sensor 182 is a gyroscope. The gyroscope can detect the rotational angular velocity of the output housing 111 relative to the working surface, the workpiece or the outside world, so as to obtain the deflection angle of the output housing 111 during the operation of the impact tool 100.

[0082] In some embodiments, both the first sensor 181 and the second sensor 182 are arranged on the circuit board assembly 20. By providing the circuit board assembly 20, it is convenient for the installation of the first sensor 181 and the second sensor 182, and the integration degree is improved. During installation, only need to install the circuit board assembly 20 on the housing 11 to the set position. In some embodiments, the circuit board assembly 20 is a printed circuit board or a printed wiring board. In this embodiment, the circuit board assembly 20 and the circuit board provided with the controller 17 are arranged separately, wherein the circuit board is arranged relatively below the circuit board assembly 20. In some embodiments, the circuit board assembly 20 and the circuit board provided with the controller 17 can be integrally arranged.

[0083] As Figure 5 and Figure 6As shown, in some embodiments, the first target member 2 includes a first gear 21. The first gear 21 is connected to the output shaft 131. The second gear 3 and the third gear 4 are both rotatably arranged on the housing 11, and both the second gear 3 and the third gear 4 are in transmission connection with the first gear 21. There are two first sensors 181, and the two first sensors 181 are used to detect the rotation angles of the second gear 3 and the third gear 4 respectively. A first bearing 31 and a second bearing 41 are fixedly arranged on the housing 11. The first rotating shaft 32 is fixedly connected to the inner ring of the first bearing 31, and the second gear 3 is fixedly connected to the first rotating shaft 32. The second rotating shaft 42 is fixedly connected to the inner ring of the second bearing 41, and the third gear 4 is fixedly connected to the second rotating shaft 42. Both the second gear 3 and the third gear 4 can be directly meshed with the first gear 21, and the first gear 21 drives the second gear 3 and the third gear 4 to rotate. One of the first sensors 181 collects the rotation angle of the second gear 3, and the other first sensor 181 collects the rotation angle of the third gear 4. Then, the rotation angle of the first gear 21 can be obtained through the transmission ratio conversion between the first gear 21 and the second gear 3, and the rotation angle of the first gear 21 can be obtained through the transmission ratio conversion between the first gear 21 and the third gear 4. The data of the rotation angles of the two first gears 21 are used for calibration. For example, the average value of the two can be taken as the rotation angle of the first gear 21, so as to obtain the rotation angle of the output shaft 131. Through the above method, the accuracy of the rotation angle of the output shaft 131 collected can be further improved.

[0084] In some embodiments, as Figure 6 shown, a lower convex groove body 1121 protrudes downward in the housing of the holding portion 113, and an upper convex groove body 1122 protrudes upward in the holding portion 113. The upper convex groove body 1122 is located behind the lower convex groove body 1121. Among them, the lower convex groove body 1121 is arranged at the connection between the motor housing 112 and the housing of the holding portion 113. The motor housing 112 includes a fastener fixing portion extending into the holding portion 113, and the fastener fixing portion and the inner wall of the housing of the holding portion 113 form the lower convex groove body 1121. The upper convex groove body 1122 is formed along the outer periphery of the switching portion 161. The wire 201 is arranged in the upper convex groove body 1122 and the lower convex groove body 1121, and is arranged along the edges of the upper convex groove body 1122 and the lower convex groove body 1121. One end of the wire 201 is electrically connected to the lower end of the control board assembly 20, and the other end of the wire 201 is electrically connected to the power supply 30 and the controller 17. By arranging the wire 201 in the above way, while facilitating wiring, it can prevent the wire 201 from interfering with the impact mechanism 15 and the output mechanism 13, so as to ensure that the control board assembly 20 can work normally.

[0085] In some embodiments, a fourth gear, a fifth gear, etc. that are in transmission connection with the first gear 21 may also be arranged. For each gear, a matching first sensor 181 is arranged. Multiple rotation angle data are collected through the multiple first sensors 181, and then the rotation angle of the final output shaft 131 is obtained through processing.

[0086] In some embodiments, a number of intermediate gears that mesh with each other may also be arranged between the first gear 21 and the second gear 3, and a number of intermediate gears that mesh with each other may be arranged between the first gear 21 and the third gear 4. The first gear 21 drives the second gear 3 to rotate through a number of intermediate gears, and the first gear 21 drives the third gear 4 to rotate through a number of intermediate gears. The number of intermediate gears may be 1, 2, 3... There is no excessive limitation here, and only the corresponding number of intermediate gears needs to be arranged according to the actual installation requirements.

[0087] In some embodiments, the diameter of the first gear 21 is larger than the diameter of the second gear 3, and the diameter of the first gear 21 is larger than the diameter of the third gear 4. By using the larger-diameter first gear 21 to drive the smaller-diameter second gear 3, the second gear 3 can amplify the rotation of the first gear 21. Even if the rotation angle of the first gear 21 is small, after being amplified by the second gear 3, it can ensure that the first sensor 181 accurately collects data. Similarly, by using the larger-diameter first gear 21 to drive the smaller-diameter third gear 4, the third gear 4 can amplify the rotation of the first gear 21. Even if the rotation angle of the first gear 21 is small, after being amplified by the third gear 4, it can ensure that the first sensor 181 accurately collects data. Then, by processing the rotation angle data collected by the two groups of first sensors 181, the accuracy of the obtained rotation angle of the output shaft 131 can be further improved.

[0088] In some embodiments, the number of teeth of the second gear 3 is not the same as the number of teeth of the third gear 4. Through the above settings, the transmission ratios between the first gear 21 and the second gear 3 and between the first gear 21 and the third gear 4 are different, and the rotation angles of the second gear 3 and the third gear 4 collected by the two first sensors 181 are also different. After conversion through the transmission ratio, two different sets of data on the rotation angle of the output shaft 131 are obtained. By processing the two sets of data, such as taking the average value, the accuracy of the obtained data on the rotation angle of the output shaft 131 can be further improved.

[0089] Such as Figure 7 and Figure 8As shown, in some embodiments, the first target component 2 includes a toothed structure 22 with protrusions on the output shaft 131, and the first sensor 181 is used to detect the rotation angle of the toothed structure 22. By integrating the toothed structure 22 on the output shaft 131, the rotation of the toothed structure 22 relative to the output shaft 131 can be eliminated, ensuring the consistency of the rotation of the toothed structure 22 and the output shaft 131. The first sensor 181 can obtain the rotation angle of the output shaft 131 by collecting the rotation angle of the toothed structure 22.

[0090] In some embodiments, the first sensor 181 is an angle sensor, and a circuit board assembly 20 is provided on the outer periphery of the toothed structure 22, and the first sensor 181 is arranged on the circuit board assembly 20. In some embodiments, the circuit board assembly 20 is a printed circuit board or a printed wiring board. The rotation angle of the toothed structure 22 can be detected by the first sensor 181, and the rotation angle of the toothed structure 22 is the rotation angle of the output shaft 131. The first sensor 181 is arranged on the circuit board assembly 20. During installation, only the circuit board assembly 20 needs to be installed into the housing 11 so that the first sensor 181 cooperates with the toothed structure 22.

[0091] As Figure 7 shown, as an implementation manner of this embodiment, the output housing 111 includes a receiving portion 1111 and a cover 1112. In this embodiment, a support hole 1113 for the output shaft 131 to extend out of the output housing 111 is provided on the cover 1112. A clamping member 114 is arranged in the receiving portion 1111 for fixing the circuit board assembly 20 at a preset position. In this embodiment, the output shaft 131, the toothed structure 22, and the circuit board assembly 20 are all arranged in the same receiving space of the receiving portion 1111.

[0092] As Figure 8 shown, as another implementation manner of this embodiment, the output housing 111 includes a receiving portion 1111 and a cover. Among them, the receiving portion 1111 supports the output shaft 131 and is provided with a support hole 1113 for the output shaft 131 to extend out of the output housing 111. The receiving portion 1111 includes a first receiving space for receiving part of the impact mechanism 15, the output shaft 131, and the toothed structure 22, and a second receiving space for receiving the circuit board assembly 20. The first receiving space and the second receiving space communicate in the up-down direction so that the first sensor 181 can detect the movement of the toothed structure 22. The cover covers the opening of the second receiving space. Since the repair rate and replacement rate of the first sensor 181 are higher than those of the output shaft 131 and the toothed structure 22, the first sensor 181 is independently arranged in the second receiving space, which can avoid the impact on other components caused by the repair or replacement of the first sensor 181.

[0093] In some embodiments, two oppositely arranged clamping members 114 are provided inside the front end of the output housing 111. The clamping members 114 are provided with clamping grooves 1141, and the circuit board assembly 20 is inserted into the clamping grooves 1141. Regarding the fixing structure of the circuit board assembly 20, the designer can arrange it according to actual needs, and no excessive restrictions are imposed here.

[0094] In some embodiments, a circuit board assembly 20 is provided on the outer periphery of the tooth structure 22. The second sensor 182 is a gyroscope, and the gyroscope is fixedly arranged on the circuit board assembly 20. In some embodiments, the circuit board assembly 20 is a printed circuit board or a printed wiring board. The second sensor 182 faces the output housing 111. By detecting the deflection angle of the output housing 111 through the second sensor 182 and calculating in combination with the rotation angle of the output shaft 131 obtained by the first sensor 181, the absolute rotation angle of the output shaft 131 can be obtained.

[0095] The present application also provides an impact tool 100. The impact tool 100 includes a housing 11, a motor, an output shaft 131, an impact mechanism 15, a controller 17, and a detection assembly 18. The housing 11 is provided with a receiving space; the motor includes a drive shaft 121 that rotates about a first axis 101; the output shaft 131 is used to output torque externally. The impact mechanism 15 is used to apply an impact force to the output shaft 131; the impact mechanism 15 includes an impact block driven by the motor and an anvil that cooperates with the impact block and is impacted by the impact block. The controller 17 is used to control the motor; the detection assembly 18 is used to detect the rotation angle of the output shaft 131 relative to the housing 11 and generate an output signal, and the output signal is sent to the controller 17. By detecting the rotation angle of the output shaft 131 through the detection assembly 18 and obtaining the absolute rotation angle of the output shaft 131, the actual output torque of the impact tool 100 can be obtained through function calculation. In related products, because the impact wrench will generate vibration, shaking, or swinging during use, when adopting a scheme of directly measuring the rotation angle of the output shaft 131 relative to the outside world, the obtained rotation angle data of the output shaft 131 will be interfered by the overall rotation angle of the impact wrench, resulting in the measured data not being the angle change of the output shaft 131 due to load reasons. Furthermore, the calculated torque is inaccurate, and the actual output torque cannot be accurately measured, thus the consistency between the output torque and the preset torque cannot be guaranteed. By using the detection assembly 18 to detect the rotation angle of the output shaft 131 relative to the housing 11, and then obtaining the absolute rotation angle of the output shaft 131, the actual output torque of the impact tool 100 can be obtained, and the consistency between the actual output torque and the preset torque can be guaranteed.

[0096] Such as Figure 9As shown, in some embodiments, the detection component 18 includes a camera 183. The camera 183 is mounted on the housing 11 and is directly used to detect the absolute rotation angle of the output shaft 131 and generate an output signal to be sent to the controller 17. By providing the camera 183, the rotation angle of the output shaft 131 can be accurately obtained, and the structure is simple.

[0097] In some embodiments, the camera 183 can capture the relative positions of the bolt and the workpiece in real time, such as the rotation angle and / or the screwing depth, etc. The captured content is sent back to the controller 17 for processing. When the rotation angle or the depth reaches a preset value, the impact tool 100 stops working, achieving precise control of the output torque.

[0098] The foregoing has shown and described the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the above embodiments do not limit the present application in any form. Any technical solutions obtained by using equivalent replacements or equivalent transformations fall within the protection scope of the present application.

Claims

1. An impact tool, characterized in that, Comprising: A housing provided with a receiving space; A motor including a drive shaft that rotates about a first axis; An output shaft for externally outputting torque; An impact mechanism for applying an impact force to the output shaft; the impact mechanism includes an impact block driven by the motor and an anvil that cooperates with the impact block and is impacted by the impact block; A controller for controlling the motor; A detection assembly including a first sensor and a second sensor, wherein the first sensor is formed on or connected to the output shaft to measure the rotation angle of the output shaft relative to the working surface; The second sensor is formed on or connected to the housing to measure the rotation angle of the housing relative to the working surface, and the first sensor and the second sensor respectively or jointly generate an output signal, and the output signal is sent to the controller.

2. The impact tool according to claim 1, characterized in that, It further includes a first target member, and the first target member moves with the output shaft according to a preset rule, and the first sensor is used to detect the rotation angle of the first target member.

3. The impact tool according to claim 2, characterized in that, The first target member includes a first gear, the first gear is connected to the output shaft, a second gear is rotatably arranged on the housing, and the second gear is in transmission connection with the first gear, and the first sensor is used to detect the rotation angle of the second gear.

4. The impact tool according to claim 3, characterized in that, The diameter of the first gear is larger than the diameter of the second gear.

5. The impact tool according to claim 3, characterized in that, The first sensor is a magnetic encoder, a magnetic member is arranged at the end of the second gear, and the first sensor is arranged in cooperation with the magnetic member.

6. The impact tool according to claim 1, characterized in that, The second sensor is a gyroscope.

7. The impact tool according to claim 2, characterized in that, The first target member includes a first gear, the first gear is connected to the output shaft, a second gear and a third gear are both rotatably arranged on the housing, and both the second gear and the third gear are in transmission connection with the first gear, and two first sensors are provided, and the two first sensors are used to respectively detect the rotation angles of the second gear and the third gear.

8. The impact tool according to claim 7, characterized in that, The diameter of the first gear is larger than the diameter of the second gear, and the diameter of the first gear is larger than the diameter of the third gear.

9. The impact tool according to claim 7, characterized in that, The number of teeth of the second gear is inconsistent with the number of teeth of the third gear.

10. The impact tool according to claim 2, characterized in that, The first target member includes a toothed structure with protrusions on the output shaft, and the first sensor is used to detect the rotation angle of the toothed structure.

11. The impact tool according to claim 10, characterized in that, The first sensor is an angle sensor, a circuit board assembly is arranged on the outer periphery of the toothed structure, and the first sensor is arranged on the circuit board assembly.

12. The impact tool according to claim 10, characterized in that, A circuit board assembly is arranged on the outer periphery of the toothed structure, the second sensor is a gyroscope, and the gyroscope is arranged on the circuit board assembly.

13. An impact tool, characterized in that, Comprising: A housing provided with a receiving space; A motor including a drive shaft that rotates about a first axis; An output shaft for externally outputting torque; An impact mechanism for applying an impact force to the output shaft; the impact mechanism includes an impact block driven by the motor and an anvil that cooperates with the impact block and is impacted by the impact block; A controller for controlling the motor; A detection assembly for detecting the rotation angle of the output shaft relative to the housing and generating an output signal, and the output signal is sent to the controller.

14. A rotary power tool, characterized in that, Comprising: A housing provided with a receiving space; A motor, including a drive shaft that rotates about a first axis; An output shaft for externally outputting torque, the output shaft rotating about an output axis; A controller for controlling the motor; A detection component that detects the rotation angle of the output shaft relative to the housing and generates an output signal, the output signal being sent to the controller.

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