Electric screwdriver

Abstract

The application provides an electric tightening tool. The electric tightening tool comprises a fixed cylinder, a shell and a locking nut. The fixed cylinder comprises a first cylinder part and a second cylinder part arranged along an axial direction. The shell is sleeved on the outer periphery of the second cylinder part. The locking nut is sleeved on the outer periphery of the first part and is threadedly connected with the first part. The first part is one of the first cylinder part and the shell, and the second part is the other one of the first cylinder part and the shell. The second part is provided with a first abutting part, and the locking nut is provided with a second abutting part. When the locking nut is screwed in the direction of approaching the second part to the second abutting part abutting against the first abutting part and continues to screw in, the first part moves axially relative to the locking nut in the direction opposite to the screwing direction of the locking nut, so that the second cylinder part and the shell are relatively displaced along the axial direction of the fixed cylinder to reduce or eliminate the axial connection gap between the shell and the second cylinder part.

Description

Technical Field

[0001] This application relates to the field of electric tightening tools, and more particularly to an electric tightening tool. Background Technology

[0002] The power assembly of an electric tightening tool is typically connected to its housing using screws or snap-fit ​​connections with upper and lower covers. In related technologies, electric tightening tools usually assemble and connect each component—power structure, sensor, transmission structure, etc.—to the housing separately. However, due to insufficient structural strength and rigidity of the housing, when each component is connected individually, the concentricity between components is difficult to guarantee due to deformation under stress. This can easily lead to instability in the motor's position within the housing, affecting the consistency of different electric tightening tools and also causing additional noise during use. Summary of the Invention

[0003] To solve the above-mentioned technical problems, this application provides an electric tightening tool.

[0004] This application provides an electric tightening tool, which includes a fixed cylinder, a housing, and a locking nut. The fixed cylinder includes a first cylinder portion and a second cylinder portion arranged along the axial direction. The housing is sleeved on the outer periphery of the second cylinder portion. The locking nut is sleeved on the outer periphery of a first component and threadedly connected to the first component. The first component is one of the first cylinder portion and the housing, and the second component is the other of the first cylinder portion and the housing. The second component has a first abutting portion, and the locking nut has a second abutting portion. The first abutting portion and the second abutting portion are used to abut against each other to limit the axial movement of the locking nut.

[0005] When the locking nut is screwed in towards the second component until the second abutment part abuts against the first abutment part and continues to screw in, the first component moves axially relative to the locking nut in a direction opposite to the screwing direction of the locking nut, so that the second cylindrical part and the shell are displaced relative to each other along the axis of the fixed cylindrical part, thereby reducing or eliminating the axial connection gap between the shell and the second cylindrical part.

[0006] When the first component is the first cylindrical part and the second component is the housing, the first cylindrical part drives the second cylindrical part to move axially relative to the housing in a direction opposite to the screwing direction of the locking nut, thereby generating a relative displacement with the housing.

[0007] When the first component is the housing and the second component is the first cylindrical part, the housing moves axially relative to the second cylindrical part in a direction opposite to the screwing direction of the locking nut, thereby generating a relative displacement with the second cylindrical part.

[0008] The electric tightening tool provided in this application, by setting the fixed cylinder, allows the power structure, sensor assembly, transmission structure, etc., to be pre-integrated into a modular assembly structure with the fixed cylinder. This assembly structure is then assembled with the housing as a whole, avoiding the problem of concentricity difficulties caused by insufficient structural strength and rigidity of the housing when the power structure, sensor assembly, transmission structure, etc., are assembled separately with the housing. In addition, by sleeved the locking nut on the outer periphery of the first component and threadedly connected to the first component, and providing a first abutting part on the second component for abutting the second abutting part of the locking nut, the locking nut is axially limited. When the locking nut is tightened until the second abutting part abuts the first abutting part, the first component threadedly connected to the locking nut moves relative to the locking nut in a direction opposite to the tightening direction, thereby causing relative displacement between the fixed cylinder and the housing, reducing or eliminating the axial connection gap between the two. This avoids axial movement of the transmission system caused by a large axial connection gap, strengthens the axial rigidity of the transmission system, and improves the stability and output accuracy of torque transmission. Attached Figure Description

[0009] To more clearly illustrate the technical solution of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0010] Figure 1 This is a schematic diagram of the assembly structure of the electric tightening tool in some embodiments of this application when the locking nut is not in contact with the housing.

[0011] Figure 2 for Figure 1 The diagram shows a cross-sectional structure of the electric tightening tool.

[0012] Figure 3 for Figure 2 A magnified view of the local structure.

[0013] Figure 4 for Figure 3 A magnified view of A in the middle.

[0014] Figure 5This is a schematic diagram of the assembly structure of the electric tightening tool in some embodiments of this application when the locking nut abuts against the housing.

[0015] Figure 6 for Figure 5 The diagram shows a cross-sectional structure of the electric tightening tool.

[0016] Figure 7 for Figure 6 A magnified view of the local structure.

[0017] Figure 8 for Figure 7 A magnified view of B in the middle.

[0018] Figure 9 for Figure 1 and Figure 2 The exploded structure of the electric tightening tool shown is a schematic diagram from one perspective.

[0019] Figure 10 for Figure 1 and Figure 2 A schematic diagram of the exploded structure of the electric tightening tool shown from another perspective.

[0020] Figure 11 for Figure 9 and Figure 10 The diagram shows the structure of the fixed cylinder from one perspective.

[0021] Figure 12 for Figure 9 and Figure 10 The diagram shows the structure of the fixed cylinder from another perspective.

[0022] Figure 13 for Figure 9 and Figure 10 The diagram shows the structure of the shell.

[0023] Figure 14 for Figure 9 and Figure 10 The diagram shows the structure of the locking nut.

[0024] Figure 15 This is a partial structural diagram of the fixed cylinder, housing, and locking nut when the locking nut of the electric tightening tool is not in contact with the housing in some other embodiments of this application.

[0025] Figure 16 This is a partial structural diagram of the fixed cylinder, housing, and locking nut when the locking nut of the electric tightening tool abuts against the housing in some other embodiments of this application.

[0026] Figure 17 for Figure 9 and Figure 10The diagram shows the structure of the end cap.

[0027] Figure 18 for Figure 9 and Figure 10 The diagram shows the structure of the connecting nut.

[0028] Icon labels: 100 - Electric tightening tool; 10 - Fixed cylinder; 20 - Housing; 30 - Locking nut; 11 - First cylinder section; 12 - Second cylinder section; CL - Central axis; 21 - First abutment part; 31 - Second abutment part; G - Gap; 211 - First abutment surface; 311 - Second abutment surface; 212 - Third abutment surface; 312 - Fourth abutment surface; 213 - First extension part; 214 - First flange part; 313 - Second extension part; 314 - Second flange part; 121 - First connecting part; 22 - Second connecting part; 40 - Power assembly; 50 - Torque Torque sensor assembly; 60-output shaft assembly; 41-power unit; 42-drive shaft; 61-output shaft; 62-output shaft bearing; 13-first limiting ring; 14-second limiting ring; 70-end cover; 80-connecting nut; 71-stop ring; 81-push ring; 82-threaded ring; 72-first positioning part; 111-second positioning part; 23-first housing; 24-second housing; 231-first sub-abutment surface; 232-third sub-abutment surface; 241-second sub-abutment surface; 242-fourth sub-abutment surface; 112-external thread; 32-internal thread. Detailed Implementation

[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0030] In the description of this application, the terms "first," "second," "third," "fourth," etc., are used to distinguish different objects, not to describe a specific order, nor to indicate or imply relative importance or the number of technical features indicated. The terms "upper," "lower," "inner," "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, "multiple" means two or more, "multiple types" means two or more, and "multiple times" means two or more.

[0031] The phrase "some embodiments" and similar expressions described in the embodiments of this application mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "some embodiments," "other embodiments," "other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiments, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized.

[0032] In the description of this application, unless otherwise expressly specified and limited, the term "connection" should be interpreted broadly. For example, it can refer to a fixed connection or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium; it can also refer to the internal connection of two components; it can be a communication connection; or it can be an electrical connection. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. A fixed connection can be a detachable fixed connection or a non-detachable fixed connection.

[0033] It should be noted that the illustrations provided in the embodiments of this application are only schematic representations of the basic concept of this application. The illustrations only show the components related to this application and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0034] This application provides an electric tightening tool, which includes a fixed cylinder, a housing, and a locking nut. The fixed cylinder includes a first cylinder portion and a second cylinder portion arranged along the axial direction. The housing is sleeved on the outer periphery of the second cylinder portion. The locking nut is sleeved on the outer periphery of a first component and threadedly connected to the first component. The first component is one of the first cylinder portion and the housing, and the second component is the other of the first cylinder portion and the housing. The second component has a first abutting portion, and the locking nut has a second abutting portion. The first abutting portion and the second abutting portion are used to abut against each other to limit the axial movement of the locking nut.

[0035] When the locking nut is screwed in towards the second component until the second abutment portion abuts against the first abutment portion and continues to screw in, the first component moves axially relative to the locking nut in a direction opposite to the screwing direction of the locking nut. This causes a relative displacement between the second cylindrical portion and the housing along the axial direction of the fixed cylindrical portion, thereby reducing or eliminating the axial connection gap between the housing and the second cylindrical portion. The screwing direction of the locking nut is parallel to the axial direction of the fixed cylindrical portion and is close to the second component.

[0036] When the first component is the first cylindrical part and the second component is the housing, the first cylindrical part drives the second cylindrical part to move axially relative to the housing in a direction opposite to the screwing direction of the locking nut, thereby generating a relative displacement with the housing.

[0037] When the first component is the housing and the second component is the first cylindrical part, the housing moves axially relative to the second cylindrical part in a direction opposite to the screwing direction of the locking nut, thereby generating a relative displacement with the second cylindrical part.

[0038] The aforementioned axial movement can refer to movement along the axis parallel to the fixed cylinder.

[0039] Please see Figures 1 to 14 , Figure 1 This is a schematic diagram of the assembly structure of the electric tightening tool 100 in some embodiments of this application when the locking nut 30 is not in contact with the housing 20. Figure 2 for Figure 1 The diagram shows a cross-sectional structure of the electric tightening tool 100. Figure 3 for Figure 2 Enlarged view of the local structure, Figure 4 for Figure 3 Enlarged view of A in the middle. Figure 5 This is a schematic diagram of the assembly structure of the electric tightening tool 100 in some embodiments of this application when the locking nut 30 abuts against the housing 20. Figure 6 for Figure 5 The diagram shows a cross-sectional structure of the electric tightening tool 100. Figure 7 for Figure 6 Enlarged view of the local structure, Figure 8 for Figure 7 Enlarged view of B in the middle. Figure 9 for Figure 1 and Figure 2 The exploded view of the electric tightening tool 100 shown is a schematic diagram from one perspective. Figure 10 for Figure 1 and Figure 2 A schematic diagram of the exploded structure of the electric tightening tool 100 shown from another perspective. Figure 11 for Figure 9 and Figure 10 The diagram shown is a structural schematic of the fixed cylinder 10 from one viewpoint. Figure 12 for Figure 9 and Figure 10 The diagram shows the structure of the fixed cylinder 10 from another perspective. Figure 13 for Figure 9 and Figure 10 The schematic diagram of the shell 20 shown is as follows. Figure 14 for Figure 9 and Figure 10 The diagram shows the structure of the locking nut 30. The electric tightening tool 100 includes a fixed cylinder 10, a housing 20, and a locking nut 30. The fixed cylinder 10 includes a first cylinder portion 11 and a second cylinder portion 12 arranged along the axial direction. The housing 20 is sleeved on the outer periphery of the second cylinder portion 12. The axial direction of the fixed cylinder 10 is the extension direction of the central axis CL of the fixed cylinder 10.

[0040] The locking nut 30 is sleeved on the outer periphery of the first cylindrical part 11 and threadedly connected to the first cylindrical part 11. The housing 20 is provided with a first abutting part 21, and the locking nut 30 is provided with a second abutting part 31. The first abutting part 21 and the second abutting part 31 are used to abut against each other to limit the axial movement of the locking nut 30. That is, the first component is the first cylindrical part 11, and the second component is the housing 20.

[0041] like Figure 4 As shown, when the fixed cylinder 10 and the housing 20 are initially assembled and the locking nut 30 is not in contact with the housing 20, there is an axial connection gap G between the housing 20 and the fixed cylinder 10.

[0042] like Figure 7 and Figure 8 As shown, when the locking nut 30 is screwed in a direction close to the housing 20 until it abuts against the housing 20 and continues to screw in, the axial movement of the locking nut 30 is restricted because the first abutting part 21 abuts against the second abutting part 31. In this case, the continuous screwing causes the screwing force of the locking nut 30 to react through the threaded pair on the first cylindrical part 11, driving the first cylindrical part 11 in the same direction as the screwing of the locking nut 30 (e.g., ...). Figure 7 and Figure 8 The opposite direction of X1 (as shown) Figure 7 and Figure 8 The locking nut 30 moves axially relative to the locking nut 30 in the X2 direction, causing the second cylindrical part 12 to move axially relative to the housing 20 in the same direction. Specifically, when the locking nut 30 is screwed in along the X1 direction until it abuts against the housing 20 and continues to screw in, the second cylindrical part 12 moves along the X2 direction, causing a relative displacement between the second cylindrical part 12 and the housing 20 along the axial direction of the fixed cylindrical part 10. This reduces or eliminates the axial connection gap G between the housing 20 and the second cylindrical part 12. The screwing direction of the locking nut 30 is parallel to the axial direction of the fixed cylindrical part 10 and close to the housing 20.

[0043] Please see Figures 15 to 16 , Figure 15This is a partial structural diagram of the fixed cylinder 10, housing 20, and locking nut 30 when the locking nut 30 of the electric tightening tool 100 is not in contact with the housing 20 in other embodiments of this application. Figure 16 This is a partial structural diagram of the fixed cylinder 10, housing 20, and locking nut 30 when the locking nut 30 of the electric tightening tool 100 abuts against the housing 20 in some embodiments of this application. In other embodiments, the locking nut 30 is sleeved on the outer periphery of the housing 20 and threadedly connected to the housing 20. The first cylinder portion 11 has a first abutting portion 21, and the locking nut 30 has a second abutting portion 31. The first abutting portion 21 and the second abutting portion 31 are used to abut against each other to limit the axial movement of the locking nut 30. That is, the first component is the housing 20, and the second component is the first cylinder portion 11.

[0044] like Figure 15 and Figure 16 As shown, when the locking nut 30 is screwed in a direction close to the first cylindrical portion 11 until it abuts against the first cylindrical portion 11 and continues to screw in, the axial movement of the locking nut 30 is restricted because the first abutting portion 21 abuts against the second abutting portion 31. In this case, the continuous screwing causes the screwing force of the locking nut 30 to react on the housing 20 through the threaded pair, driving the housing 20 in the same direction as the screwing of the locking nut 30 (e.g., ...). Figure 16 The opposite direction of the X3 direction shown (e.g.) Figure 15 and Figure 16 The locking nut 30 moves axially relative to the locking nut 30 and the second cylindrical part 12 in the X4 direction shown, thereby generating a relative displacement with the second cylindrical part 12 along the axial direction of the fixed cylindrical part 10, thus reducing or eliminating the axial connection gap G between the housing 20 and the second cylindrical part 12. The locking nut 30 is screwed in a direction parallel to the axial direction of the fixed cylindrical part 10 and close to the first cylindrical part 11.

[0045] The electric tightening tool 100 provided in this application embodiment, by setting the fixed cylinder 10, allows the power structure, sensor assembly, transmission structure, etc., to be pre-integrated with the fixed cylinder 10 into a modular assembly structure. This assembly structure is then assembled with the housing 20 as a whole, avoiding the problem of concentricity being difficult to guarantee when the power structure, sensor assembly, transmission structure, etc., are assembled with the housing 20 separately due to insufficient structural strength and rigidity of the housing 20. Furthermore, by sleeved the locking nut 30 on the outer periphery of the first component and threadedly connected to the first component, and by providing a first abutting part 21 on the second component for abutting against the second abutting part 31 of the locking nut 30, the locking nut 30 is axially limited. When the locking nut 30 is tightened until the second abutting part 31 abuts against the first abutting part 21, the first component moves relative to the locking nut 30 in a direction opposite to the screwing direction of the locking nut 30. This causes relative displacement between the fixed cylinder 10 and the housing 20, thereby reducing or eliminating the axial connection gap G between the two. This avoids axial movement of the transmission system caused by a large axial connection gap G, strengthens the axial rigidity of the transmission system, and improves the stability and output accuracy of torque transmission.

[0046] In some embodiments, the first component is the first cylindrical portion 11, and the second component is the housing 20. When the first abutting portion 21 abuts against the second abutting portion 31, the locking nut 30 at least restricts the radial and / or circumferential movement of the housing 20 relative to the second cylindrical portion 12. For example, restricting the radial expansion of the housing 20 to radially lock the housing 20 improves the coaxiality between the housing 20 and the fixed cylindrical portion 10, avoids transmission deviation and component wear caused by radial movement, and thus improves the stability and output accuracy of torque transmission. Restricting the circumferential movement of the housing 20 prevents the housing 20 from rotating relative to the fixed cylindrical portion 10, thereby further improving the stability and output accuracy of torque transmission.

[0047] In other embodiments, the first component is the housing 20, and the second component is the first cylindrical portion 11. When the first abutting portion 21 abuts against the second abutting portion 31, the first cylindrical portion 11 restricts the radial and / or circumferential movement of the locking nut 30 relative to the housing 20. Since the locking nut 30 is threadedly connected to the housing 20, it restricts the radial and / or circumferential movement of the housing 20 relative to the second cylindrical portion 12. Therefore, the housing 20 can be radially locked, and the coaxiality between the housing 20 and the fixed cylindrical portion 10 can be improved.

[0048] In some embodiments, such as Figures 2 to 4, Figures 6 to 8 , Figure 15 , Figure 16 As shown, the first abutting part 21 is provided with a first abutting surface 211, and the second abutting part 31 is provided with a second abutting surface 311. The first abutting surface 211 and the second abutting surface 311 are perpendicular to the axial direction of the fixed cylinder 10. The first abutting surface 211 and the second abutting surface 311 are used to abut against each other to limit the axial movement of the locking nut 30.

[0049] By setting the first abutment surface 211 and the second abutment surface 311 to be perpendicular to the axial direction of the fixed cylinder 10, when the locking nut 30 is screwed in until the two abutment surfaces abut against each other, the normal direction of the two abutment surfaces is parallel to the axial direction. This allows the axial reaction force on the locking nut 30 to be transmitted to the housing 20 to the maximum extent, thereby limiting the axial movement of the locking nut 30 with the highest efficiency. Furthermore, the abutment surface structure perpendicular to the axial direction is simple, easy to process and fit, and can achieve a stable and reliable axial limiting effect.

[0050] In addition, the contact surface perpendicular to the axial direction can provide a larger axial force-bearing area and a more uniform stress distribution. As the locking nut 30 is continuously screwed in, the first component threadedly connected to the locking nut 30 can obtain a more stable reverse driving force, thereby making the relative displacement between the fixed cylinder 10 and the housing 20 smoother, and thus more reliably reducing or eliminating the axial connection gap G between them.

[0051] In some embodiments, such as Figures 2 to 4 , Figures 6 to 8 As shown, the first component is the first cylindrical portion 11, and the second component is the housing 20. The first abutting portion 21 has a third abutting surface 212, and the second abutting portion 31 has a fourth abutting surface 312. The angle between the third abutting surface 212 and the fourth abutting surface 312 and the axial direction of the fixed cylindrical portion 10 is greater than or equal to 0° and less than 90°. The first abutting surface 211 and the second abutting surface 311 are used to abut against each other to limit the axial movement of the locking nut 30. The third abutting surface 212 and the fourth abutting surface 312 are used to abut against each other so that the locking nut 30 restricts the radial movement and / or circumferential movement of the housing 20 relative to the second cylindrical portion 12.

[0052] When the locking nut 30 is screwed in a direction close to the second component until the fourth abutment surface 312 abuts against the third abutment surface 212, the third abutment surface 212 is closer to the fixed cylinder 10 than the fourth abutment surface 312, and the locking nut 30 restricts the radial and / or circumferential movement of the housing 20 relative to the second cylinder portion 12.

[0053] By setting the angle between the third abutment surface 212 and the fourth abutment surface 312 and the axial direction of the fixed cylinder 10 to be greater than or equal to 0° and less than 90°, and by setting the third abutment surface 212 to be closer to the fixed cylinder 10 than the fourth abutment surface 312, when the third abutment surface 212 and the fourth abutment surface 312 are in contact, the locking nut 30 can limit the radial movement of the housing 20 and restrict its radial movement, and can also limit its circumferential rotation.

[0054] In other embodiments, such as Figure 15 , Figure 16 As shown, the first component is the housing 20, and the second component is the first cylindrical portion 11. The first abutting portion 21 has a third abutting surface 212, and the second abutting portion 31 has a fourth abutting surface 312. The angle between the third abutting surface 212 and the fourth abutting surface 312 and the axial direction of the fixed cylindrical portion 10 is greater than or equal to 0° and less than 90°. The first abutting surface 211 and the second abutting surface 311 are used to abut against each other to limit the axial movement of the locking nut 30. The third abutting surface 212 and the fourth abutting surface 312 are used to abut against each other so that the first cylindrical portion 11 restricts the radial movement and / or circumferential movement of the housing 20 relative to the second cylindrical portion 12.

[0055] When the locking nut 30 is screwed in a direction close to the second component until the fourth abutment surface 312 abuts against the third abutment surface 212, the fourth abutment surface 312 is closer to the fixed cylinder 10 than the third abutment surface 212, and the first cylinder portion 11 restricts the radial and / or circumferential movement of the housing 20 relative to the second cylinder portion 12.

[0056] By setting the angle between the third abutment surface 212 and the fourth abutment surface 312 and the axial direction of the fixed cylinder 10 to be greater than or equal to 0° and less than 90°, and by setting the fourth abutment surface 312 to be closer to the fixed cylinder 10 than the third abutment surface 212, the first cylinder portion 11 can constrain the radial and circumferential movement of the shell 20 when the third abutment surface 212 and the fourth abutment surface 312 are in contact.

[0057] In some embodiments, when the first component is the housing 20 and the second component is the first cylindrical portion 11, when the fourth abutting surface 312 abuts against the third abutting surface 212, the third abutting surface 212 is closer to the fixed cylindrical portion 10 than the fourth abutting surface 312, that is, the third abutting surface 212 is located inside the fourth abutting surface 312.

[0058] In some embodiments, the angle between the third abutment surface 212 and the fourth abutment surface 312 and the axial direction of the fixed cylinder 10 is greater than 0° and less than 90°.

[0059] By setting the third abutment surface 212 and the fourth abutment surface 312 to form an acute angle with the axial direction of the fixed cylinder 10, the two abutment surfaces form a wedge-shaped fit structure when they abut. When the locking nut 30 is screwed in along the direction closer to the second component, the fourth abutment surface 312 abuts against the third abutment surface 212 and converts the axial screwing force of the locking nut 30 into two component forces in two directions, namely, an axial component force and a radial component force. The axial component force can axially limit the locking nut 30, thereby further constraining the axial movement of the locking nut 30. The radial component force can apply radial and circumferential constraints to the housing 20 to limit the radial and circumferential movement of the housing 20 relative to the second cylinder part 12.

[0060] In some embodiments, such as Figures 2 to 4 , Figures 6 to 8 As shown, the first component is the first cylindrical portion 11, the second component is the housing 20, the first abutting portion 21 includes a first extension portion 213 and a first flange portion 214, the first flange portion 214 is circumferentially disposed at the end of the first extension portion 213 away from the first cylindrical portion 11, at least a portion of the first flange portion 214 facing the end face of the locking nut 30 forms the first abutting surface 211, at least a portion of the outer peripheral surface of the first extension portion 213 forms the third abutting surface 212, at least a portion of the second abutting portion 31 facing the end face of the housing 20 forms the second abutting surface 311, and at least a portion of the inner peripheral surface of the second abutting portion 31 forms the fourth abutting surface 312.

[0061] In some embodiments, such as Figures 2 to 4 , Figures 6 to 8 As shown, the first extension 213 surrounds the second cylindrical portion 12, the outer diameter of the third abutting surface 212 decreases as it approaches the first cylindrical portion 11 in the axial direction of the fixed cylindrical portion 10, the second abutting portion 31 surrounds the first cylindrical portion 11, and the outer diameter of the fourth abutting surface 312 increases as it approaches the second cylindrical portion 12 in the axial direction of the fixed cylindrical portion 10.

[0062] By setting the outer diameter of the third abutment surface 212 to decrease as it approaches the first cylindrical part 11 and the outer diameter of the fourth abutment surface 312 to increase as it approaches the second cylindrical part 12, a wedge-shaped fit structure that fits each other can be formed when the two abutment surfaces abut together, which can constrain the axial movement of the locking nut 30 and apply radial constraint to the housing 20.

[0063] In some embodiments, such as Figures 15 to 16 As shown, the first component is the housing 20, the second component is the first cylindrical portion 11, and the second abutting portion 31 includes a second extension portion 313 and a second flange portion 314. The second flange portion 314 is circumferentially disposed at the end of the second extension portion 313 away from the first cylindrical portion 11. At least a portion of the second flange portion 314 facing the end face of the first cylindrical portion 11 forms the second abutting surface 311, and at least a portion of the outer peripheral surface of the second extension portion 313 forms the fourth abutting surface 312. At least a portion of the first abutting portion 21 facing the end face of the housing 20 forms the first abutting surface 211, and at least a portion of the inner peripheral surface of the first abutting portion 21 forms the third abutting surface 212.

[0064] In some embodiments, such as Figures 15 to 16 As shown, the second extension 313 surrounds the second cylindrical portion 12, the outer diameter of the fourth abutting surface 312 decreases as it approaches the first cylindrical portion 11 in the axial direction of the fixed cylindrical portion 10, the first abutting portion 21 surrounds the first cylindrical portion 11, and the outer diameter of the third abutting surface 212 increases as it approaches the second cylindrical portion 12 in the axial direction of the fixed cylindrical portion 10.

[0065] By setting the outer diameter of the fourth abutment surface 312 to decrease as it approaches the first cylindrical part 11 and the outer diameter of the third abutment surface 212 to increase as it approaches the second cylindrical part 12, a wedge-shaped fit structure that adapts to each other can be formed when the two abutment surfaces abut together, which can constrain the axial movement of the locking nut 30 and apply radial constraint to the housing 20.

[0066] In some embodiments, the first abutment surface 211, the third abutment surface 212, the second abutment surface 311, and the fourth abutment surface 312 may be annular surfaces, so that the locking nut 30 and the housing 20 form a continuous annular surface contact in the circumferential direction. The annular surface contact has a large contact area and uniform force in the circumferential direction, which can prevent the locking nut 30 from deflecting due to uneven force during the screwing process, thereby improving the stability of radial locking of the housing 20 and improving the consistency of reducing or eliminating the axial connection gap G between the housing 20 and the fixed cylinder 10.

[0067] In other embodiments, the first abutting surface 211, the third abutting surface 212, the second abutting surface 311, and the fourth abutting surface 312 may be arc-shaped surfaces.

[0068] In some embodiments, such as Figures 2 to 4 , Figures 6 to 8 , Figure 11 , Figure 12 As shown, the outer wall of the second cylindrical part 12 is provided with a first connecting part 121, and the inner wall of the shell 20 is provided with a second connecting part 22. The second connecting part 22 and the first connecting part 121 are axially clearance-fitted. That is, when the fixed cylindrical part 10 and the shell 20 are initially assembled, there is an axial gap between the first connecting part 121 and the second connecting part 22. This gap is the axial connection gap G between the fixed cylindrical part 10 and the shell 20. When the locking nut 30 is screwed in towards the second component until the second abutting part 31 abuts against the first abutting part 21 and continues to screw in, the first component moves axially relative to the locking nut 30 in a direction opposite to the screwing direction of the locking nut 30. This causes the second cylindrical part 12 and the housing 20 to have relative displacement along the axial direction of the fixed cylindrical part 10, so that the second connecting part 22 and the first connecting part 121 abut against each other. That is, the second connecting part 22 and the first connecting part 121 change from a clearance fit to abutting fit, thereby eliminating the axial connection gap G between the housing 20 and the second cylindrical part 12.

[0069] Before the locking nut 30 is screwed in towards the second component until it abuts the first abutting part 21 and the second abutting part 31, the fixed cylinder 10 and the housing 20 maintain a movable clearance fit in the axial direction, which can provide a margin of movement for the initial assembly and disassembly of the two; after the locking nut 30 is tightened, the fixed cylinder 10 and the housing 20 restrict the axial relative movement of the two through the abutment of the connecting part, thereby taking into account both the convenience of assembly and disassembly and the reliability of axial positioning.

[0070] The number of the first connecting portion 121 and the second connecting portion 22 can be one or more. When there are multiple first connecting portions 121, they can be distributed circumferentially along the second cylindrical portion 12, and the multiple second connecting portions 22 can be distributed circumferentially along the shell 20.

[0071] In some embodiments, the first connecting part 121 and the second connecting part 22 can be connected by snap-fitting, riveting or other methods.

[0072] In some embodiments, the first connecting portion 121 is a protrusion on the outer wall of the second cylindrical portion 12, and the second connecting portion 22 is a recess on the inner wall of the housing 20, with the protrusion embedded in the recess; or, the first connecting portion 121 is a recess on the outer wall of the second cylindrical portion 12, and the second connecting portion 22 is a protrusion on the inner wall of the housing 20, with the protrusion embedded in the recess.

[0073] By setting the first connecting part 121 and the second connecting part 22 as a protrusion and a recess respectively, after the locking nut 30 is screwed in the direction close to the second component until the first abutting part 21 and the second abutting part 31 abut against each other, the protrusion and the recess abut against each other in the axial direction to restrict the axial relative movement between the fixed cylinder 10 and the housing 20.

[0074] In addition, since the protrusion is embedded in the concave part, the two also form mutual restraint in the circumferential direction, which can prevent the housing 20 from rotating circumferentially relative to the fixed cylinder 10, further improving the circumferential positioning accuracy and transmission stability in the torque transmission process.

[0075] In some embodiments, such as Figures 2 to 3 , Figures 6 to 7 , Figures 9 to 10 As shown, the electric tightening tool 100 further includes a power assembly 40, a torque sensor assembly 50, and an output shaft assembly 60. The power assembly 40 includes a power body 41 and a drive shaft 42. The power body 41 is connected to the end of the second cylindrical portion 12 away from the first cylindrical portion 11. The drive shaft 42 is disposed inside the second cylindrical portion 12. The torque sensor assembly 50 is disposed inside the second cylindrical portion 12, wherein the drive shaft 42 passes through the torque sensor assembly 50, and the torque sensor assembly 50 is used to collect the torque when the drive shaft 42 rotates. The output shaft assembly 60 is disposed inside the second cylindrical portion 12, and the output shaft assembly 60 includes an output shaft 61 connected to the drive shaft 42 and an output shaft bearing 62 sleeved on the output shaft 61.

[0076] Thus, the power assembly 40, the torque sensor assembly 50, the output shaft assembly 60 and the fixed cylinder 10 can be integrated into a modular assembly structure, which is beneficial to improving the coaxiality of the power assembly 40, the torque sensor assembly 50 and the output shaft assembly 60.

[0077] By integrating the power assembly 40, the torque sensor assembly 50, and the output shaft assembly 60 inside the fixed cylinder 10, and using the fixed cylinder 10 as a common mounting reference, the coaxiality between the components is guaranteed by the machining accuracy of the fixed cylinder 10. This avoids the problem of difficulty in ensuring concentricity when each component is connected to the housing 20 separately due to insufficient structural strength and rigidity of the housing 20. It improves the coaxiality of the torque transmission path, reduces transmission errors and energy losses caused by coaxiality deviations, and improves the assembly accuracy and transmission efficiency of the whole machine.

[0078] In some embodiments, the power unit 41 includes a motor. The drive shaft 42 includes the motor shaft of the motor, or further includes a connecting shaft fixedly connected to the motor shaft. The motor shaft passes through the torque sensor assembly 50 and is fixedly connected to the output shaft 61, or the connecting shaft passes through the torque sensor assembly 50 and is fixedly connected to the output shaft 61.

[0079] In some embodiments, the electric tightening tool 100 further includes a bit, which is fixedly connected to the output shaft 61.

[0080] In some embodiments, the power unit 41 and the end of the second cylindrical part 12 away from the first cylindrical part 11 can be fixedly connected by bolts, snap-fit, riveting or other means.

[0081] In some embodiments, such as Figure 3 , Figure 7 , Figure 12 As shown, the fixed cylinder 10 also includes a first limiting ring 13 and a second limiting ring 14. The first limiting ring 13 protrudes from the inner peripheral wall of the first cylinder portion 11 or the second cylinder portion 12, and the second limiting ring 14 protrudes from the inner peripheral wall of the second cylinder portion 12 and is closer to the power body 41 than the first limiting ring 13.

[0082] The torque sensor assembly 50 is held between the first limiting ring 13 and the second limiting ring 14, and the output shaft bearing 62 is held against the side of the first limiting ring 13 away from the torque sensor assembly 50.

[0083] The first limiting ring 13 and the second limiting ring 14 together clamp the torque sensor assembly, restricting the axial movement of the torque sensor assembly 50 relative to the fixed cylinder 10, thus determining the axial position of the torque sensor assembly 50 within the fixed cylinder 10. Furthermore, the first limiting ring 13 axially abuts the output shaft bearing 62 on its other side, restricting the axial movement of the output shaft bearing 62 toward the torque sensor assembly 50, thus determining the axial position of the output shaft bearing 62 within the fixed cylinder 10. This helps to ensure the coaxiality among the drive shaft 42, the torque sensor assembly 50, and the output shaft bearing 62. In addition, by sharing the first limiting ring 13, that is, by abutting the torque sensor assembly 50 on one side of the first limiting ring 13 and abutting the output shaft bearing 62 on the other side, the two components are axially positioned with a single limiting structure, so that the torque sensor assembly 50 and the output shaft bearing 62 are arranged adjacent to each other in the axial direction and separated by the same limiting ring. This not only reduces the number of parts, reduces the internal space of the fixed cylinder 10, simplifies the internal structure of the fixed cylinder 10, but also reduces the processing cost.

[0084] In some embodiments, the first limiting ring 13 may include a plurality of first limiting segments, which are arranged at intervals along the circumference of the fixed cylinder 10.

[0085] In some embodiments, the first limiting ring 13 may be an open or closed ring structure.

[0086] In some embodiments, the second limiting ring 14 may include a plurality of second limiting segments arranged at intervals along the circumference of the fixed cylinder 10.

[0087] In some embodiments, the second limiting ring 14 may be an open or closed ring structure.

[0088] In some embodiments, such as Figures 1 to 10 As shown, the electric tightening tool 100 also includes an end cap 70 and a connecting nut 80. The end cap 70 is located on the side of the first cylindrical part 11 away from the second cylindrical part 12. The connecting nut 80 is sleeved on the outer periphery of the end cap 70 and the first cylindrical part 11 and is threadedly connected to the first cylindrical part 11. The connecting nut 80 is used to lock the end cap 70 and the first cylindrical part 11. When the connecting nut 80 locks the end cap 70 and the first cylindrical part 11, the end of the end cap 70 near the first cylindrical part 11 abuts against the output shaft bearing 62.

[0089] After the connecting nut 80 is tightened, the end cap 70 presses the output shaft bearing 62 against the first limiting ring 13 from one end of the first cylindrical part 11, thereby limiting the axial position of the output shaft bearing 62 and preventing the output shaft bearing 62 from moving axially during the operation of the electric tightening tool 100. This ensures the axial position accuracy of the output shaft 61, thereby ensuring the reliability of the connection between the output shaft 61 and the drive shaft 42 and the stability of torque transmission.

[0090] The end cap 70 is fitted onto the end of the first cylindrical section 11, serving to prevent dust and contamination, thus avoiding external impurities from entering the fixed cylindrical section 10 and affecting the working accuracy and service life of the torque sensor assembly 50 and the output shaft bearing 62. The connecting nut 80 simultaneously locks the end cap 70 to the first cylindrical section 11 and axially limits the output shaft bearing 62, integrating the end-sealing function of the fixed cylindrical section 10 and the bearing limiting function into one unit. This reduces the number of parts, simplifies the assembly process, and improves assembly efficiency.

[0091] In some embodiments, the end cap 70 may integrate functional modules, including but not limited to a spotlight module and a pressure-activated module. In other embodiments, the end cap 70 does not integrate functional modules.

[0092] Please see Figure 17 and Figure 18 , Figure 17 for Figure 9 and Figure 10 The schematic diagram of the end cap 70 shown is as follows. Figure 18 for Figure 9 and Figure 10 The diagram shows the structure of the connecting nut 80. In some embodiments, such as... Figure 3 , Figure 7 , Figure 17 and Figure 18 As shown, the outer peripheral wall of the end cap 70 is provided with a stop ring 71, and the connecting nut 80 includes a push ring 81 and a threaded ring 82 arranged along the axial direction of the fixed cylinder 10. The inner diameter of the threaded ring 82 is larger than the outer diameter of the stop ring 71, and the inner diameter of the push ring 81 is smaller than the outer diameter of the stop ring 71. The threaded ring 82 is threadedly connected to the first cylinder part 11.

[0093] When the threaded ring 82 is tightened in the direction close to the second cylindrical part 12, the push ring 81 abuts against the stop ring 71. The push ring 81 pushes the stop ring 71 to move in the direction close to the second cylindrical part 12, thereby causing the end cover 70 to move in the direction close to the second cylindrical part 12, so that the end of the end cover 70 close to the first cylindrical part 11 abuts against the output shaft bearing 62, and the end cover 70 is locked to the first cylindrical part 11.

[0094] By setting the inner diameter of the threaded ring 82 to be larger than the outer diameter of the stop ring 71, when the connecting nut 80 is fitted onto the end cap 70 and the first cylindrical part 11, the threaded ring 82 can smoothly pass through the stop ring 71 and be threadedly connected to the first cylindrical part 11, while the push ring 81, with its smaller inner diameter, cannot pass through the stop ring 71, thus forming an abutting fit with the stop ring 71 in the axial direction. When the threaded ring 82 is tightened in the direction closer to the second cylindrical part 12, the push ring 81 abuts against the stop ring 71 and pushes the stop ring 71 to move in the same direction, thereby driving the end cap 70 to move closer to the second cylindrical part 12, so that the end of the end cap 70 near the fixed cylindrical part 10 abuts against the output shaft bearing 62, and at the same time, the end cap 70 is locked to the first cylindrical part 11.

[0095] With the above structure, during the tightening process, the connecting nut 80, through the cooperation of the push ring 81 and the stop ring 71, converts the screwing motion of the threaded ring 82 into the axial movement of the end cover 70, so that the end cover 70 automatically moves towards and abuts against the output shaft bearing 62 while the connecting nut 80 is tightened. This structure allows the locking of the end cover 70 to the fixed cylinder 10 and the pressing against the output shaft bearing 62 to be completed by the same tightening action of the connecting nut 80, eliminating the need for separate operations, reducing assembly steps, and improving assembly efficiency.

[0096] In some embodiments, the stop ring 71 may include a plurality of stop segments arranged at circumferential intervals along the fixed cylinder 10.

[0097] In some embodiments, the stop ring 71 may be an open or closed annular structure.

[0098] In some embodiments, the push ring 81 may include a plurality of push segments arranged at circumferential intervals along the fixed cylinder 10.

[0099] In some embodiments, the push ring 81 may be an open or closed ring structure.

[0100] In some embodiments, such as Figure 17 and Figure 11 As shown, the end cap 70 has a first positioning part 72 near the end of the first cylindrical body 11, and the first cylindrical body 11 has a second positioning part 111 near the end cap 70. The first positioning part 72 is connected to the second positioning part 111. Thus, the end cap 70 and the first cylindrical body 11 can be positioned and engaged in the axial direction through the connection of the first positioning part 72 and the second positioning part 111, which helps to improve the coaxiality of the end cap 70 and the first cylindrical body 11.

[0101] During assembly, the first positioning part 72 can be connected to the second positioning part 111 to achieve initial positioning of the end cover 70 and the first cylindrical part 11. Then, the connecting nut 80 can be tightened in the direction close to the second cylindrical part 12. This can prevent relative misalignment or displacement between the end cover 70 and the first cylindrical part 11 during the tightening of the connecting nut 80, and ensure that the end of the end cover 70 accurately abuts against the output shaft bearing 62.

[0102] In some embodiments, the first positioning part 72 and the second positioning part 111 can be connected by means of snap-fitting, riveting, or bonding.

[0103] In some embodiments, the first positioning part 72 is one of a protrusion and a groove, and the second positioning part 111 may be the other of a protrusion and a groove.

[0104] In some embodiments, the number of the first positioning part 72 and the second positioning part 111 may be one or more. When there are multiple first positioning parts 72, they may be distributed circumferentially along the end cap 70, and the multiple second positioning parts 111 may be distributed circumferentially along the first cylindrical part 11.

[0105] In some embodiments, the first component is the first cylindrical portion 11, and the second component is the shell 20, such as... Figure 3 and Figure 7 As shown, the housing 20 is formed by at least a first housing 23 and a second housing 24 joined together radially. The first housing 23 has a first sub-abutment surface 231 and a third sub-abutment surface 232 connected at the end near the first cylindrical part 11. The second housing 24 has a second sub-abutment surface 241 and a fourth sub-abutment surface 242 connected at the end near the first cylindrical part 11. The first sub-abutment surface and the second sub-abutment surface 241 constitute the first abutment surface 211, and the third sub-abutment surface 232 and the fourth sub-abutment surface 242 constitute the third abutment surface 212.

[0106] In some embodiments, the fixed cylinder 10 may include a plurality of first connecting portions 121, and the housing 20 may include a plurality of second connecting portions 22, wherein some of the second connecting portions 22 may be disposed on the inner wall of the first housing 23, and the remaining second connecting portions 22 may be disposed on the inner wall of the second housing 24, and each second connecting portion 22 is connected to a corresponding first connecting portion 121.

[0107] The two-part housing can be assembled by closing it from both radial sides of the fixed cylinder 10, making it easier to install the fixed cylinder 10. It is especially suitable for scenarios where the fixed cylinder 10 has multiple components such as the power assembly 40, the torque sensor assembly 50, and the output shaft assembly 60 pre-integrated on it, eliminating the need for long-distance insertion from the axial end of the fixed cylinder 10 and reducing assembly difficulty.

[0108] In other embodiments, the housing 20 is a one-piece housing.

[0109] In some embodiments, the first component is the first cylindrical portion 11, and the second component is the shell 20, such as... Figure 3 , Figure 7 , Figure 11 , Figure 14 As shown, the first cylindrical part 11 is provided with an external thread 112, and the locking nut 30 is provided with an internal thread 32 that is adapted to the external thread 112. The locking nut 30 and the first cylindrical part 11 are threadedly connected by the internal thread 32 and the external thread 112. The axial dimension of the internal thread 32 is smaller than the axial dimension of the external thread 112.

[0110] By setting the axial dimension of the internal thread 32 to be smaller than that of the external thread 112, the external thread 112 has a axial margin not covered by the locking nut 30. This margin allows the locking nut 30 to be pre-screwed to the far end of the external thread 112, i.e., away from the second cylindrical part 12, during assembly. This provides sufficient operating space for the installation of the housing 20 and the fixed cylindrical part 10. After the housing 20 and the fixed cylindrical part 10 are installed in place, the locking nut 30 is screwed in towards the housing 20. As the locking nut 30 continues to be screwed in after it abuts against the housing 20, axial clearance between the housing 20 and the fixed cylindrical part 10 is eliminated and the housing 20 is radially locked. In addition, this margin facilitates the adjustment of the screwing stroke of the locking nut 30, so that the locking nut 30 can compensate for axial connection gaps G under different dimensional tolerances, improving the product's adaptability to different axial connection gaps G. Furthermore, when the locking nut 30 is tightened to abut against the housing 20, the remaining portion of the external thread 112 can still be screwed into by the connecting nut 80, so that the connecting nut 80 is threadedly connected to the first cylindrical portion 11.

[0111] In some embodiments, the connecting nut 80 and the locking nut 30 may share the same external thread 112, that is, the connecting nut 80 and the locking nut 30 are respectively connected to different axial sections of the same external thread 112. In other embodiments, the outer periphery of the first cylindrical portion 11 is provided with two external threads 112, and the connecting nut 80 and the locking nut 30 are respectively engaged with the two external threads 112. The dimensions of the two external threads 112 may be the same or different, and the two external threads 112 may be connected or spaced apart.

[0112] In this application embodiment, "parallel" can be understood as approximately parallel, allowing for non-absolute parallelism due to factors such as assembly tolerances, design tolerances, and structural flatness. A small angular range of error, such as within 15°, is permissible and can be considered as a parallel relationship. Similarly, "perpendicular" can be understood as approximately perpendicular, allowing for non-absolute perpendicularity due to factors such as assembly tolerances, design tolerances, and structural flatness. A small angular range of error, such as within 15°, is permissible and can be considered as a perpendicular relationship.

[0113] It is understood that the structure illustrated in the embodiments of this application does not constitute a specific limitation on the electric tightening tool 100. In other embodiments of this application, the electric tightening tool 100 may include more or fewer components than illustrated, or combine some components, or disassemble some components, or have different component arrangements.

[0114] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0115] The above are the implementation methods of the embodiments of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the embodiments of this application, and these improvements and modifications are also considered to be within the protection scope of this application.

Claims

1. An electric tightening tool, characterized in that, The electric tightening tool includes: A fixed cylinder includes a first cylinder section and a second cylinder section arranged along the axial direction; The shell is fitted onto the outer periphery of the second cylindrical part; A locking nut is sleeved on the outer periphery of a first component and threadedly connected to the first component. The first component is one of the first cylindrical part and the housing, and the second component is the other of the first cylindrical part and the housing. The second component is provided with a first abutting part, and the locking nut is provided with a second abutting part. The first abutting part and the second abutting part are used to abut against each other to limit the axial movement of the locking nut. When the locking nut is screwed in towards the second component until the second abutment abuts against the first abutment and continues to screw in, the first component moves axially relative to the locking nut in a direction opposite to the screwing direction of the locking nut, so that the second cylindrical part and the shell are displaced relative to each other along the axis of the fixed cylinder, so as to reduce or eliminate the axial connection gap between the shell and the second cylindrical part. Wherein, when the first component is the first cylindrical part and the second component is the housing, the first cylindrical part drives the second cylindrical part to move axially relative to the housing in a direction opposite to the screwing direction of the locking nut, thereby generating a relative displacement with the housing; When the first component is the housing and the second component is the first cylindrical part, the housing moves axially relative to the second cylindrical part in a direction opposite to the screwing direction of the locking nut, thereby generating a relative displacement with the second cylindrical part.

2. The electric tightening tool according to claim 1, characterized in that, The first component is the first cylindrical portion, and the second component is the housing, wherein when the first abutting portion abuts against the second abutting portion, the locking nut restricts the radial and / or circumferential movement of the housing relative to the second cylindrical portion; or The first component is the housing, and the second component is the first cylindrical portion, wherein when the first abutting portion abuts against the second abutting portion, the first cylindrical portion restricts the radial and / or circumferential movement of the housing relative to the second cylindrical portion.

3. The electric tightening tool according to claim 1 or 2, characterized in that, The first abutting part is provided with a first abutting surface, and the second abutting part is provided with a second abutting surface. The first abutting surface and the second abutting surface are perpendicular to the axial direction of the fixed cylinder. The first abutting surface and the second abutting surface are used to abut against each other to limit the axial movement of the locking nut.

4. The electric tightening tool according to claim 2, characterized in that, The first component is the first cylindrical body portion, the second component is the housing, the first abutting portion has a third abutting surface, the second abutting portion has a fourth abutting surface, the included angle between the third abutting surface and the fourth abutting surface and the axial direction of the fixed cylindrical body is greater than or equal to 0° and less than 90°, wherein, when the locking nut is screwed in towards the second component until the fourth abutting surface abuts against the third abutting surface, the third abutting surface is closer to the fixed cylindrical body than the fourth abutting surface, and the locking nut restricts the radial and / or circumferential movement of the housing relative to the second cylindrical body portion; or The first component is the housing, the second component is the first cylindrical part, the first abutting part is provided with a third abutting surface, the second abutting part is provided with a fourth abutting surface, the included angle between the third abutting surface and the fourth abutting surface and the axial direction of the fixed cylindrical part is greater than or equal to 0° and less than 90°, wherein, when the locking nut is screwed in along the direction close to the second component until the fourth abutting surface abuts against the third abutting surface, the fourth abutting surface is closer to the fixed cylindrical part than the third abutting surface, and the first cylindrical part restricts the radial movement and / or circumferential movement of the housing relative to the second cylindrical part.

5. The electric tightening tool according to claim 2, characterized in that, The first component is the first cylindrical portion, and the second component is the housing. The first abutting portion includes a first extension and a first flange. The first flange is circumferentially disposed at the end of the first extension away from the first cylindrical portion. At least a portion of the first flange facing the end face of the locking nut forms a first abutting surface. At least a portion of the outer peripheral surface of the first extension forms a third abutting surface. At least a portion of the second abutting portion facing the end face of the housing forms a second abutting surface. At least a portion of the inner peripheral surface of the second abutting portion forms a fourth abutting surface. The first abutting surface and the second abutting surface abut against each other to limit the axial movement of the locking nut. The third abutting surface and the fourth abutting surface abut against each other so that the locking nut restricts the radial and / or circumferential movement of the housing relative to the second cylindrical portion; or The first component is the housing, the second component is the first cylindrical portion, the second abutting portion includes a second extension and a second flange, the second flange is circumferentially disposed at the end of the second extension away from the first cylindrical portion, at least a portion of the second flange facing the end face of the first cylindrical portion forms the second abutting surface, at least a portion of the outer peripheral surface of the second extension forms the fourth abutting surface, at least a portion of the first abutting portion facing the end face of the housing forms the first abutting surface, at least a portion of the inner peripheral surface of the first abutting portion forms the third abutting surface, the first abutting surface and the second abutting surface are used to abut against each other to limit the axial movement of the locking nut, the third abutting surface and the fourth abutting surface are used to abut against each other so that the first cylindrical portion restricts the radial and / or circumferential movement of the housing relative to the second cylindrical portion.

6. The electric tightening tool according to claim 5, characterized in that, The first component is the first cylindrical body portion, the second component is the shell, the first abutting portion includes the first extension portion and the first flange portion, the first extension portion surrounds the second cylindrical body portion, the outer diameter of the third abutting surface decreases as it approaches the first cylindrical body portion in the axial direction of the fixed cylindrical body, the second abutting portion surrounds the first cylindrical body portion, and the outer diameter of the fourth abutting surface increases as it approaches the second cylindrical body portion in the axial direction of the fixed cylindrical body; or The first component is the housing, the second component is the first cylindrical part, the second abutting part includes the second extension and the second flange, the second extension surrounds the second cylindrical part, the outer diameter of the fourth abutting surface decreases as it approaches the first cylindrical part in the axial direction of the fixed cylindrical part, the first abutting part surrounds the first cylindrical part, and the outer diameter of the third abutting surface increases as it approaches the second cylindrical part in the axial direction of the fixed cylindrical part.

7. The electric tightening tool according to claim 1 or 2, characterized in that, The outer wall of the second cylindrical part is provided with a first connecting part, and the inner wall of the shell is provided with a second connecting part, wherein the second connecting part and the first connecting part are axially clearance fitted. When the locking nut is screwed in towards the second component until the second abutment abuts against the first abutment and continues to screw in, the first component moves axially relative to the locking nut in a direction opposite to the screwing direction of the locking nut, causing the second cylindrical part and the housing to have relative displacement along the axis of the fixed cylindrical part, so that the second connecting part and the first connecting part abut against each other, thereby eliminating the axial connection gap between the housing and the second cylindrical part.

8. The electric tightening tool according to claim 7, characterized in that, The first connecting portion is a protrusion on the outer wall of the second cylindrical portion, and the second connecting portion is a recess on the inner wall of the shell, with the protrusion fitted into the recess; or The first connecting part is a recess on the outer wall of the second cylindrical part, and the second connecting part is a protrusion on the inner wall of the shell, wherein the protrusion is embedded in the recess.

9. The electric tightening tool according to claim 1 or 2, characterized in that, The electric tightening tool also includes: A power assembly includes a power unit and a drive shaft. The power unit is connected to the end of the second cylindrical portion away from the first cylindrical portion, and the drive shaft is disposed inside the second cylindrical portion. A torque sensor assembly is disposed inside the second cylindrical part, wherein the drive shaft passes through the torque sensor assembly, and the torque sensor assembly is used to collect the torque when the drive shaft rotates; An output shaft assembly is disposed within the second cylindrical portion. The output shaft assembly includes an output shaft connected to the drive shaft and an output shaft bearing sleeved on the output shaft.

10. The electric tightening tool according to claim 9, characterized in that, The fixed cylinder also includes a first limiting ring and a second limiting ring. The first limiting ring protrudes from the inner peripheral wall of the first cylinder portion or the second cylinder portion, and the second limiting ring protrudes from the inner peripheral wall of the second cylinder portion and is closer to the power body than the first limiting ring. The torque sensor assembly is held between the first limiting ring and the second limiting ring, and the output shaft bearing is held against the side of the first limiting ring away from the torque sensor assembly.

11. The electric tightening tool according to claim 9, characterized in that, The electric tightening tool further includes an end cap and a connecting nut. The end cap is located on the side of the first cylindrical part away from the second cylindrical part. The connecting nut is sleeved on the outer periphery of the end cap and the first cylindrical part and is threadedly connected to the first cylindrical part. The connecting nut is used to lock the end cap and the first cylindrical part. When the connecting nut locks the end cap and the first cylindrical part, the end of the end cap near the first cylindrical part abuts against the output shaft bearing.

12. The electric tightening tool according to claim 11, characterized in that, The outer peripheral wall of the end cap is provided with a stop ring, and the connecting nut includes a push ring and a threaded ring arranged along the axial direction of the fixed cylinder. The inner diameter of the threaded ring is larger than the outer diameter of the stop ring, and the inner diameter of the push ring is smaller than the outer diameter of the stop ring. The threaded ring is threadedly connected to the first cylinder part. When the threaded ring is tightened in the direction close to the second cylindrical part, the push ring abuts against the stop ring, and the push ring pushes the stop ring to move in the direction close to the second cylindrical part, thereby causing the end cover to move in the direction close to the second cylindrical part, so that the end of the end cover close to the first cylindrical part abuts against the output shaft bearing, and the end cover is locked to the first cylindrical part.

13. The electric tightening tool according to claim 11, characterized in that, The end cap is provided with a first positioning part at the end near the first cylindrical part, and the end of the first cylindrical part is provided with a second positioning part at the end near the end cap. The first positioning part is connected to the second positioning part.

14. The electric tightening tool according to claim 3, characterized in that, The first component is the first cylindrical part, and the second component is the shell. The shell is formed by at least a first shell and a second shell joined together radially. The first shell has a first sub-abutment surface at the end near the first cylindrical part, and the second shell has a second sub-abutment surface at the end near the first cylindrical part. The first sub-abutment surface and the second sub-abutment surface constitute the first abutment surface.

15. The electric tightening tool according to claim 1, characterized in that, The first component is the first cylindrical part, and the second component is the shell. The first cylindrical part is provided with an external thread, and the locking nut is provided with an internal thread adapted to the external thread. The locking nut and the first cylindrical part are threadedly connected by the internal thread and the external thread. The axial dimension of the internal thread is smaller than the axial dimension of the external thread.

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