Jacking electric wrench

Abstract

The utility model discloses a top punching electric wrench capable of realizing outward translation of an axial lead of a working part. The top punching electric wrench comprises a shell, a power output part and an output offset part, the shell comprises a holding part and a mounting part, the holding part is used for being held by an operator, and the power output part and the output deviation part are mounted on the mounting part. The power output part is provided with an impact shaft, the impact shaft is rotationally installed on the shell, and the power output part can drive the impact shaft to rotate. The output offset part comprises a driving gear, a driven gear, a driven gear shaft and a connecting piece; the driving gear is connected to the impact shaft in a sleeving mode and rotates along with rotation of the impact shaft, the driven gear shaft is rotationally installed on the shell, the driven gear is connected to the driven gear shaft in a sleeving mode and synchronously rotates with the driven gear shaft, and the driving gear and the driven gear are in meshing transmission connection. One end of the driven gear shaft extends out of the shell and is connected with a connecting piece outside the shell, the connecting piece is used for being detachably connected with an external rotating piece, and the driven gear shaft drives the external rotating piece to rotate through the connecting piece when rotating.

Description

Technical Field

[0001] This utility model belongs to the technical field of handheld electric impact wrenches, and particularly relates to a top-punch electric wrench. Background Technology

[0002] Electric impact wrenches can efficiently and quickly tighten or loosen bolts, screws, and other parts that are fastened by rotation. They transmit torque to threaded standard parts (i.e., bolts, screws, etc.) through an internal impact mechanism. This transmission method results in low reaction torque to the hand and is easy to operate.

[0003] However, in existing electric impact wrenches, the socket (the part that connects to the threaded standard part) is arranged in a straight line with the impact mechanism and motor, which causes the outer shell of the electric impact wrench to protrude much beyond the socket in the radial direction, thus limiting the application scenarios of the electric impact wrench. Utility Model Content

[0004] To address the aforementioned problems, this utility model provides a top-punch electric wrench, comprising a housing, a power output section, and an output offset section;

[0005] The housing includes a grip portion and a mounting portion. The grip portion is used for the operator to grip, and the power output portion and the output offset portion are respectively mounted on the mounting portion.

[0006] The power output unit has an impact shaft, which is rotatably mounted on the housing, and the power output unit can drive the impact shaft to rotate.

[0007] The output offset part includes a driving gear, a driven gear, a driven gear shaft, and a connecting piece; the driving gear is sleeved and connected to the impact shaft and rotates with the impact shaft; the driven gear shaft is rotatably mounted on the housing; the driven gear is sleeved and connected to the driven gear shaft and rotates synchronously with it; the driving gear and the driven gear are meshed and connected.

[0008] One end of the passive gear shaft extends out of the housing and is connected to a connector outside the housing. The connector is used for detachable connection with an external rotating component. When the passive gear shaft rotates, it drives the external rotating component to rotate through the connector.

[0009] Optionally, the rotation axis of the impact shaft is parallel to the rotation axis of the driven gear shaft.

[0010] Optionally, the end of the driven gear shaft that is connected to the connecting member is the output end of the driven gear shaft;

[0011] The connector is provided with a mounting hole, the output end of the driven gear shaft extends into the mounting hole, and a radial rotation limiting structure is provided between the mounting hole and the output end of the driven gear shaft so that the connector rotates when the driven gear shaft rotates.

[0012] Optionally, the radial rotation limiting structure is as follows: the shape of the mounting hole is adapted to the shape of the output end of the driven gear shaft, the cross-section of the output end of the driven gear shaft is non-circular, and when the driven gear shaft rotates, the outer side wall of its output end pushes the inner side wall corresponding to the mounting hole to drive the connector with the mounting hole to rotate.

[0013] Optionally, the output offset section may further include an anti-fall pin and an elastic limiting ring;

[0014] The outer wall of the connector is provided with an annular groove, and the elastic limiting ring is contained in the annular groove; the anti-falling pin enters the connector from the annular groove on one side of the connector and passes through the driven gear shaft, and then exits from the annular groove on the other side of the connector.

[0015] Optionally, the elastic limiting ring is a rubber ring.

[0016] Optionally, one end of the connector is connected to the driven gear shaft, and the other end is provided with a connecting hole. The axis of the connecting hole coincides with the axis of the driven gear shaft. The axis of the connecting hole is not circular. The connecting hole is used to sleeve and connect with an external rotating component so that the external rotating component is driven to rotate when the connector rotates.

[0017] Optionally, the power output unit includes a series-wound motor, a reduction mechanism, and an impact mechanism. The output end of the series-wound motor is connected to the input end of the reduction mechanism, the output end of the reduction mechanism is connected to the input end of the impact mechanism, and the output end of the impact mechanism is the impact shaft.

[0018] Because of the adoption of the above technical solution, this utility model has the following advantages and positive effects compared with the prior art:

[0019] The electric punch wrench provided by this utility model has an impact shaft and a driven gear shaft that are driven by meshing gears. The connector for connecting to external rotating parts is installed on the driven gear shaft, thereby realizing the purpose of outward translation of the axis of the working part (i.e., the axis of rotation when the connector rotates), improving the coincidence of the outer diameter generatrix of the connector with the generatrix at the maximum outer diameter of the housing, and thus being applicable to more occasions. Attached Figure Description

[0020] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention.

[0021] Figure 1 This is a schematic diagram of a punching electric wrench in the prior art;

[0022] Figure 2 This is a diagram illustrating a usage scenario of a top-punch electric wrench in the prior art.

[0023] Figure 3 This is a schematic diagram of a top-punching electric wrench according to the present invention;

[0024] Figure 4 This is an exploded view of a top-punch electric wrench according to the present invention.

[0025] Figure 5 This is a cross-sectional view of a top-punch electric wrench according to the present invention. Figure 6 (AA section in the middle).

[0026] Figure 6 for Figure 5 Schematic diagram of the HH cross section;

[0027] Figure 7 for Figure 5 Schematic diagram of the CC section;

[0028] Figure 8 This is an exploded view of an impact mechanism according to the present invention;

[0029] Figure 9 This is an engineering drawing of an impact mechanism according to the present invention;

[0030] Figure 10 This is a surface development view of an impact block with a V-groove in the inner hole according to the present invention;

[0031] Figure 11 This is a surface development view of a planetary carrier with a V-shaped groove on its outer circumference according to the present invention;

[0032] Figure 12-1 , Figure 12-2 , Figure 12-3 , Figure 12-4 and Figure 12-5 An exploded view of the dynamic working process of the outer and inner diameter unfolded curved surfaces of the impact block and planetary carrier with V-groove of this utility model.

[0033] Figure 13 This is a schematic diagram of the working state of a top-punching electric wrench according to the present invention;

[0034] Figure 14 for Figure 13 Schematic diagram of the EE cross section in the diagram;

[0035] Figure 15 for Figure 13 Schematic diagram of the FF cross section in the image;

[0036] Figure 16 for Figure 14 A schematic diagram of the GG cross-section in the image;

[0037] Figure 17 for Figure 5 Schematic diagram of the BB cross section in the middle;

[0038] Figure 18 for Figure 14 A schematic diagram of the KK cross-section.

[0039] Explanation of reference numerals in the attached figures:

[0040] 1: Driven gear; 1-1: Driven gear shaft; 2: Driving gear; 3: Driven upper bushing; 4: Driving upper bushing; 5: Impact shaft; 5-1: Impact surface; 5-2: Upper end face; 6: Impact block; 6-1: Boss; 6-1-1: Impact surface; 6-1-2: Lower end face; 7: Planetary gear; 8: Planet carrier; 8-1: Output shaft; 8-2: V-groove; 9: Internal gear ring; 10: Lower bearing; 11: Upper end cover; 12: Middle bearing; 13: ... 14: Cooling fan; 15: Stator assembly; 16: Rotor assembly; 17: Upper bearing; 18: Screw assembly; 19: Carbon brush; 20: Housing; 21: Gear shaft; 22: Intermediate housing; 23: Driving bushing; 24: Passive bushing; 25: Front cover; 26: Screw assembly; 27: Rubber ring; 28: Anti-fall pin; 29: Connector; 28-1: Annular groove; 30: Spring; 31: Thrust ball bearing; 32: Housing;

[0041] 33: Screw; 34: First workpiece; 35: Second workpiece;

[0042] L1: Centerline of the working part; L2: Generatrix at the maximum outer diameter of the outer shell; L3: Generatrix of the outer diameter of the connecting part; a: Rotation direction of the impact block. Detailed Implementation

[0043] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the specific implementation methods of this utility model will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of this utility model. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0044] To keep the drawings concise, only the parts relevant to this invention are shown schematically in each figure, and they do not represent the actual structure of the product. Furthermore, for ease of understanding, in some figures, only one of the components with the same structure or function is schematically depicted, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one."

[0045] Figure 1 The image shows a conventional punching electric wrench. The centerline L1 of its working part coincides with the centerline of the outer casing. Due to the structural size limitations of the impact mechanism in the punching electric wrench, the distance between the generatrix L2 at the maximum outer diameter of the outer casing and the generatrix L3 at the outer diameter of the connecting part is relatively large (i.e., the overlap between the generatrix L3 at the outer diameter of the connecting part and the generatrix L2 at the maximum outer diameter of the outer casing is low). This limits the application scenarios of conventional punching electric wrenches.

[0046] For example, such as Figure 2 As shown, several screws 33 are used to fix the first workpiece 34 and the second workpiece 35. However, if a punching electric wrench is used to tighten the screws 33 at the location of the first workpiece 34, the inner wall of the first workpiece 34 will interfere with the outer shell 32 of the punching electric wrench. (The position of the screws 33 on the first workpiece 34 can be further referenced.) Figure 16 This prevents the connecting piece 28 in the punching electric wrench from properly connecting with the screw 33, thus rendering the existing punching electric wrench unusable in this scenario. This embodiment addresses this shortcoming by providing a new punching electric wrench that effectively solves this problem.

[0047] See Figures 3 to 18 The electric punch wrench provided in this embodiment includes a housing 32, a power output section, and an output offset section. The housing 32 includes a grip section and a mounting section. The grip section is used for the operator to hold the wrench, and the power output section and the output offset section are respectively mounted on the mounting section. The power output section has an impact shaft 5, which is rotatably mounted on the housing 32, and the power output section can drive the impact shaft 5 to rotate.

[0048] The output offset section includes a driving gear 2, a driven gear 1, a driven gear shaft 1-1, and a connecting member 28. The driving gear 2 is sleeved and connected to the impact shaft 5 and rotates with the impact shaft 5. The driven gear shaft 1-1 is rotatably mounted on the housing 32. The driven gear 1 is sleeved and connected to the driven gear shaft 1-1 and rotates synchronously with it. The driving gear 2 and the driven gear 1 are meshed and connected. One end of the driven gear shaft 1-1 extends out of the housing 32 and is connected to the connecting member 28 outside the housing 32. The connecting member 28 is used for detachable connection with an external rotating component. When the driven gear shaft 1-1 rotates, it drives the external rotating component to rotate through the connecting member 28.

[0049] The top-punch electric wrench of this embodiment will be further described below.

[0050] Main reference Figure 4 and Figure 5 The outer casing 32 includes a housing 19, an upper cover, a middle cover 21, and a front cover 24. The mounting portion in the outer casing 32 includes the upper cover, the middle cover 21, the front cover 24, and a portion of the housing 19. The grip portion in the outer casing 32 is a part of the housing 19.

[0051] The power output section includes a series-wound motor, a reduction gear mechanism, and an impact mechanism. The output end of the series-wound motor is connected to the input end of the reduction gear mechanism, the output end of the reduction gear mechanism is connected to the input end of the impact mechanism, and the output end of the impact mechanism is the impact shaft 5. The series-wound motor is mainly mounted on the housing 19 (e.g., Figure 5 As shown, the upper half of the housing 19 is used to mount the series-wound motor, which serves as part of the mounting section, and the lower half of the housing 19 is used for the operator to hold, which serves as the grip section.

[0052] Series-wound motors are primarily used to convert electrical energy into rotational mechanical energy. Specifically, for example... Figure 4 and Figure 5 As shown, an upper bearing 16 is installed in the inner hole at the right end of the upper half of the housing 19. A stator assembly 14 is installed in the middle section of the inner hole of the upper half of the housing 19. An upper end cover 11 is installed at the left end of the upper half of the housing 19. A middle bearing 12 is installed in the inner hole at the right end of the upper end cover 11. The middle bearing 12 and the upper bearing 16 cooperate to install the rotor assembly 15. A cooling fan 13 is installed on the middle left section of the rotor assembly 15. Two symmetrical carbon brushes 18 are installed on the housing 19 (see details). Figure 6 ).

[0053] The speed reduction mechanism is mainly used to provide speed reduction and force amplification. Specifically, such as... Figure 4 and Figure 5 As shown, an intermediate shell 21 is installed on the left end face of the upper end cover 11, and a lower bearing 10 is installed in the inner hole of the left end of the upper end cover 11. The lower bearing 10 is used to install the planetary carrier 8; see also Figure 7 An internal gear ring 9 is installed in the inner hole at the right end of the intermediate shell 21. Planetary gears 7 and gear shafts 20 are installed at the upper and lower ends of the right middle end of the planetary carrier 8 (specifically, the gear shaft 20 is rotatably connected to the planetary carrier 8, and the planetary gears 7 are fixedly installed on the gear shaft 20 and rotate synchronously with the gear shaft 20). The screws in the screw assembly 17 pass through the housing 19, the upper end cover 11 and the intermediate shell 21 in sequence to fasten them (therefore, nuts may be provided accordingly, or threaded holes may be provided on the intermediate shell 21 accordingly).

[0054] Impact mechanisms are primarily used to provide sudden increases in torque. Specifically, for example... Figure 4 and Figure 5 As shown, an impact block 6 is installed in the middle of the planetary carrier 8, and an impact shaft 5 is installed at the left end of the planetary carrier 8. For more details, see [link to documentation]. Figures 8 to 1 2.

[0055] The left side of the planetary carrier 8 forms the output shaft 8-1 of the reduction mechanism, see main reference. Figure 8 and Figure 9 An impact block 6 with clearance fit is installed on the output shaft 8-1. A thrust ball bearing 31 is installed at the bottom of the concave hole of the impact block 6. The upper end face of the thrust ball bearing 31 (the "upper" in "upper end face" refers to...) Figure 9 A spring 29 is installed in the direction shown. Two steel balls 30 are symmetrically installed at the two V-grooves 8-2 in the middle section of the planet carrier 8. In the lower section of the planet carrier 8 (the "lower" in the lower section refers to...), a spring 29 is installed in the direction shown. Figure 9 An impact shaft 5 is installed in the direction shown. Figure 9 The working surface on impact shaft 5—impact surface 5-1—was selected. Besides, impact shaft 5... Figure 9 In addition to the two impact surfaces 5-1 shown in the middle, there are also two impact surfaces 5-1 on their opposite sides; Figure 9 The working surfaces on the impact block 6 are also marked: impact surface 6-1-1 (specifically set on the boss 6-1 of the impact block 6), lower end surface 6-1-2 of the boss 6-1, and upper end surface 5-2 of the impact shaft 5. Figure 10 The surface of the inner hole with the V-groove of the impact block 6 was unfolded. Figure 11 The surface of the outer circular band V-groove 8-2 of the planet carrier 8 was unfolded.

[0056] Next, let's cooperate... Figure 12-1 , Figure 12-2 , Figure 12-3 , Figure 12-4 and Figure 12-5 The working principle and dynamic working process of the impact mechanism are described in detail below (it should be noted that the following is only one feasible solution and not a limitation of this utility model). The cutting positions of the JJ and CC sections are shown in the figure. Figure 9The JJ section view shows the relative angular positions of the impact block 6 and the impact shaft 5, marked with ①-1, ②-1, ③-1, ④-1, and ⑤-1. The CC section view shows the relative positions of the planetary carrier 8, the impact block 6, and the mounted steel ball 30, marked with ①-2, ②-2, ③-2, ④-2, and ⑤-2. The views ①-3, ②-3, ③-3, ④-3, and ⑤-3 are composed of the unfolded view of the inner surface of the impact block 6 with the V-groove, the unfolded view of the outer circle of the planet carrier 8 with the V-groove 8-2, and the saddle-shaped steel ball 30. Specifically, in the views, the unfolded planes of the planet carrier 8 and the impact block 6, in the form of a rotated view, only show the relative positional relationship between the two V-grooves and the saddle-shaped steel ball 30, and are non-projectionally aligned with ①-1, ②-1, ③-1, ④-1, ⑤-1 and ①-2, ②-2, ③-2, ④-2, ⑤-2.

[0057] In views ①-3, ②-3, ③-3, ④-3, and ⑤-3, mark 6 is the unfolded view of the V-groove inside the impact block, and its outline is expressed by a thick solid line; mark 30 is the saddle-shaped steel ball, and its outline is expressed by a dashed line; mark 8 is the unfolded view of the V-groove on the outer circle of the planetary carrier, and its outline is expressed by a dashed line; arrow a indicates the rotation direction of the impact block 6.

[0058] See Figure 12-1 At the start, the impact block 6 rotates 0° (the direction of rotation is the same as the direction a of the impact block's rotation). The saddle ball 30 is positioned in the middle of the V-groove 8-2 on the unfolded surface of the planetary carrier 8. At this time, the saddle ball 30 is positioned at the rounded corner of the left bottom surface of the V-groove on the unfolded surface of the inner hole of the impact block 6. Because a spring 29 is installed on the bottom surface of the upper concave hole of the impact block 6, under the pressure of the spring 29, the two V-grooves in the planetary carrier 8 and the impact block 6 form a scissor-like inclined surface. Under the pressure of the spring 29, the saddle ball 30 is controlled and positioned, thus creating the conditions for the planetary carrier 8 to drive the impact block 6 to rotate. During rotation, the impact surface 6-1-1 of the boss 6-1 of the impact block 6 is in contact with the impact surface 5-1 of the impact shaft 5, thereby driving the impact shaft 5 to rotate, thus completing the function of tightening the screw 33. The mark Y indicates the position of the saddle ball 30 in this step.

[0059] See Figure 12-2 Driven by the rotation of the planetary carrier 8, the impact block 6, the saddle ball 30 and the spring 29 rotate clockwise. When the screw 33 that needs to be tightened reaches the pre-tightened state (i.e., when more force is needed to tighten the screw 33), the impact block 6 and the impact shaft 5 stop at a 105° angle.

[0060] The impact surface 6-1-1 on the boss 6-1 of the impact block 6 serves to complete an impact work on the impact surface 5-1 on the impact shaft 5 at this corner, thereby achieving the purpose of increasing the impact force and tightening the screw 33. Figure 12-2 The Y mark in the middle represents the 30 steel ball at the location of this step.

[0061] See Figure 12-3 Driven by the rotation of the planetary carrier 8, the impact block 6, the saddle steel ball 30 and the spring 29 rotate clockwise. However, the rotation of the impact block 6 is controlled by the impact shaft 5 and the connecting part 28 and other components, so that the rotational kinetic energy of the impact block 6 is converted into axial work, which can raise the lower end face 6-1-2 of the boss 6-1 of the impact block 6 by a height X1.

[0062] Figure 12-3 The part marked Y is the saddle-shaped steel ball 30, which is the location of this step; the mark Y′ indicates the location of the saddle-shaped steel ball 30 in the previous step. Figure 12-4 and Figure 12-5 In this context, both the Y and Y′ markers are interpreted in this way. Specifically, in... Figure 12-3 In the step shown, the saddle-shaped steel ball 30 rotates 105° clockwise with the planetary carrier 8 in the previous step, so the position of the saddle-shaped steel ball 30 shown in this figure is to the right of the axis.

[0063] See Figure 12-4 Driven by the rotation of the planetary carrier 8, the impact block 6, the saddle-shaped steel ball 30, and the spring 29 rotate clockwise, allowing the lower end face 6-1-2 of the boss 6-1 of the impact block 6 to continue rising to height X. At this point, the lower end face 6-1-2 of the boss 6-1 of the impact block 6 is higher than the upper end face 5-2 of the impact shaft 5, and the impact block 6 rotates 75° under the rotation of the planetary carrier 8. This 75° rotation in this step is the condition for the height of the impact block 6 and the lower end boss 6-1 to decrease.

[0064] See Figure 12-5 Driven by the rotation of the planetary carrier 8, and through the interaction of the saddle-shaped steel ball 30, the spring 29, and the impact block 6, the impact block 6 suddenly drops a height X and rotates back to its starting position. Figure 12-1 The posture is shown in the middle view ①-3. Up to this step, the total rotation angle of impact block 6 is 180°, and the next cycle is... Figure 12-1 , Figure 12-2 , Figure 12-3 , Figure 12-4 and Figure 12-5 The work is repeated in the corresponding steps. This achieves the purpose of tightening screw 33 by repeatedly impacting the impact shaft 5.

[0065] For details, please refer to the output offset section docking impact mechanism. Figure 4 , Figure 5 as well as Figures 13 to 18 The rotation axis of the impact shaft 5 is preferably parallel to the rotation axis of the driven gear shaft 1-1, and the driven gear shaft 1-1 and the driven gear 1 are preferably made as a single piece.

[0066] Main reference Figure 4 , Figure 5 and Figure 17 The front cover 24 houses the drive gear 2, which is mounted on the impact shaft 5. The engagement between the drive gear 2 and the impact shaft 5 is radially torsional, allowing the torque of the impact shaft 5 to be transmitted to the drive gear 2. The drive gear 2 meshes with the driven gear 1, enabling torque transmission to the driven gear 1. The front cover 24 and the intermediate shell 21 are fastened together by screws 25. A connector 28 is mounted on the driven gear shaft 1-1, which is integrally formed with the driven gear 1. The connector 28 is generally as follows... Figure 4 The sleeve structure shown in the figure.

[0067] The end of the driven gear shaft 1-1 connected to the connector 28 is the output end of the driven gear shaft 1-1. The connector 28 has a mounting hole into which the output end of the driven gear shaft 1-1 extends. A radial rotation limiting structure is provided between the mounting hole and the output end of the driven gear shaft 1-1 so that when the driven gear shaft 1-1 rotates, it drives the connector 28 to rotate, thereby allowing the torque on the driven gear 1 to be transmitted to the connector 28. Specifically, the radial rotation limiting structure may be: the shape of the mounting hole matches the shape of the output end of the driven gear shaft 1-1; the cross-section of the output end of the driven gear shaft 1-1 is non-circular; when the driven gear shaft 1-1 rotates, the outer wall of its output end pushes the inner wall corresponding to the mounting hole to drive the connector 28 with the mounting hole to rotate. Preferably, the cross-sectional shape of the driven gear shaft 1-1 may be square (e.g., ...). Figure 18 As shown), of course, in other embodiments, the cross-section of the passive gear shaft 1-1 can also be other shapes, such as a regular hexagon, etc.

[0068] Main reference Figure 5 and Figure 18 The output offset section also includes a fall-proof pin 27 and an elastic limiting ring. An annular groove 28-1 is provided on the outer wall of the connector 28, and the elastic limiting ring is housed within the annular groove 28-1. The fall-proof pin 27 enters the connector 28 from the annular groove 28-1 on one side of the connector 28, passes through the driven gear shaft 1-1, and then exits from the annular groove 28-1 on the other side of the connector 28. Both ends of the fall-proof pin 27 abut against the inner wall of the elastic limiting ring. The elastic limiting ring provides a flexible restriction on the axial displacement of the fall-proof pin 27, preventing it from falling out. The radial rotation restriction structure between the mounting hole and the output end of the driven gear shaft 1-1, along with the cooperation of the fall-proof pin 27 and the elastic limiting ring, allows the top-punch electric wrench of this embodiment to easily, conveniently, and quickly replace the connector 28, making it suitable for different specifications of threaded standard parts (i.e., external rotating parts), and thus adapting to more application scenarios.

[0069] One end of the connector 28 is connected to the driven gear shaft 1-1, and the other end is provided with a connecting hole. The axis of the connecting hole coincides with the axis of the driven gear shaft 1-1. The axis of the connecting hole is not circular. The connecting hole is used to connect with an external rotating component so that the external rotating component is driven to rotate when the connector 28 rotates. In this embodiment, the top-punch electric wrench can select the corresponding connector 28 according to different external rotating components. For example, if the connection between the external rotating component and the connector 28 is a regular hexagon, then a connector 28 with a corresponding size connecting hole and a regular hexagonal cross-section can be selected.

[0070] The elastic restraint ring is preferably made of rubber ring 26.

[0071] For more details, see Figure 4 and Figure 5 The output shaft of the impact mechanism is the impact shaft 5. An active upper bushing 4 is installed on the right side of the impact shaft 5, and is statically fitted to the left side of the intermediate housing 21. An active gear 2 is installed on the left side of the impact shaft 5, and its engagement is a radial rotation limiting structure. An active bushing 22 is installed on the left side of the active gear 2, and is statically fitted to the left side of the front end cover 24. The active gear 2 meshes with the driven gear 1. A driven upper bushing 3 is installed on the right side of the driven gear 1, and is statically fitted to the left side of the intermediate cover 21. A driven bushing 23 is installed on the left side of the driven gear 1, and is statically fitted to the left side of the front end cover 24. A connector 28 is installed on the left end of the passive gear 1. The connection is a radial rotation limiting structure. Anti-fall pins 27 are installed at the mating surfaces of the two. The two ends of the anti-fall pins 27 are flexibly fastened to the connector 28 by rubber rings 26 to prevent the anti-fall pins 27 from falling off due to axial movement. At the same time, the connector 28 can be easily replaced.

[0072] The top-punch electric wrench provided in this embodiment transfers torque from the driving gear 2 to the driven gear 1 that meshes with it. The driven gear 1 rotates synchronously with the connecting piece 28 through the driven gear shaft 1-1, thereby achieving the purpose of outward translation of the axis L1 of the working part, improving the overlap between the outer diameter generatrix L3 of the connecting piece and the generatrix L2 at the maximum outer diameter of the housing (i.e., reducing the distance between them). Therefore, the top-punch electric wrench of this embodiment can be applied to more occasions.

[0073] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, if these changes fall within the scope of the claims of the present invention and their equivalents, they shall still fall within the protection scope of the present invention.

Claims

1. A top-punch electric wrench, characterized in that, Includes the housing, power output section, and output offset section; The housing includes a grip portion and a mounting portion. The grip portion is used for the operator to grip, and the power output portion and the output offset portion are respectively mounted on the mounting portion. The power output unit has an impact shaft, which is rotatably mounted on the housing, and the power output unit can drive the impact shaft to rotate. The output offset section includes a driving gear, a driven gear, a driven gear shaft, and a connecting component; The driving gear is sleeved and connected to the impact shaft and rotates with the impact shaft. The driven gear shaft is rotatably mounted on the housing. The driven gear is sleeved and connected to the driven gear shaft and rotates synchronously with it. The driving gear and the driven gear are meshed and connected for transmission. One end of the passive gear shaft extends out of the housing and is connected to a connector outside the housing. The connector is used for detachable connection with an external rotating component. When the passive gear shaft rotates, it drives the external rotating component to rotate through the connector.

2. The top-punch electric wrench according to claim 1, characterized in that, The rotation axis of the impact shaft is parallel to the rotation axis of the driven gear shaft.

3. The top-punch electric wrench according to claim 1, characterized in that, The end of the passive gear shaft that is connected to the connector is the output end of the passive gear shaft. The connector is provided with a mounting hole, the output end of the driven gear shaft extends into the mounting hole, and a radial rotation limiting structure is provided between the mounting hole and the output end of the driven gear shaft so that the connector rotates when the driven gear shaft rotates.

4. The top-punch electric wrench according to claim 3, characterized in that, The radial rotation limiting structure is as follows: the shape of the mounting hole is adapted to the shape of the output end of the passive gear shaft, the cross-section of the output end of the passive gear shaft is non-circular, and when the passive gear shaft rotates, the outer side wall of its output end pushes the inner side wall corresponding to the mounting hole to drive the connector with the mounting hole to rotate.

5. The top-punch electric wrench according to claim 3, characterized in that, The output offset section also includes anti-fall pins and elastic limiting rings; The outer wall of the connector is provided with an annular groove, and the elastic limiting ring is contained in the annular groove; the anti-falling pin enters the connector from the annular groove on one side of the connector and passes through the driven gear shaft, and then exits from the annular groove on the other side of the connector.

6. The top-punch electric wrench according to claim 5, characterized in that, The elastic limiting ring is a rubber ring.

7. The top-punch electric wrench according to claim 1, characterized in that, One end of the connector is connected to the driven gear shaft, and the other end is provided with a connecting hole. The axis of the connecting hole coincides with the axis of the driven gear shaft. The axis of the connecting hole is not circular. The connecting hole is used to sleeve and connect with an external rotating component so that the external rotating component is driven to rotate when the connector rotates.

8. The top-punch electric wrench according to claim 1, characterized in that, The power output unit includes a series motor, a reduction mechanism, and an impact mechanism. The output end of the series motor is connected to the input end of the reduction mechanism, the output end of the reduction mechanism is connected to the input end of the impact mechanism, and the output end of the impact mechanism is the impact shaft.

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