Electric ratchet wrench

Abstract

The invention discloses an electric ratchet wrench, which belongs to the field of power tools, solves the problem of complicated structure of the electric ratchet wrench in the prior art, and adopts the technical scheme that the electric ratchet wrench comprises a handle provided with a driving motor and a head shell provided with a transmission shaft and an output head, the ratchet wheel is provided with an inserting hole used for installing an output head, a pawl is installed in the head shell in a sliding mode, a first elastic piece is arranged between the head shell and the pawl, and the first elastic piece applies acting force towards the direction of the ratchet wheel to the pawl, so that the pawl tends to be meshed with the ratchet wheel all the time. The pawl is matched with the ratchet wheel to limit the ratchet wheel to rotate only in one direction, the transmission shaft is in transmission connection with the ratchet wheel through a gear assembly, and an output shaft of the driving motor extends to the head shell and is connected with the transmission shaft through a one-way clutch. The structure of the electric ratchet wrench is simplified.

Description

Technical Field

[0001] The present invention relates to the field of power tools, in particular to an electric ratchet wrench. Background Art

[0002] The electric ratchet wrenches currently on the market include handles, wrench head assemblies, motors and other parts. The output shaft of the motor is connected to a transmission shaft. The most common form is that an eccentric push block is provided on the transmission shaft, and the output ratchet assembly is driven back and forth by the rotation of the eccentric block. The ratchet ring has a pawl limit in a certain rotation direction to drive the output assembly to move, and a sliding fit in the opposite direction to achieve unidirectional power output. However, the eccentric mechanism has dead points and low operating efficiency. It cannot effectively utilize the kinetic energy output by the motor and the transmitted torque is small. Of course, in the prior art, there is also Japanese patent JP3248824U which discloses that the anti-reversal mechanism of the head shell includes a manual anti-reversal mechanism and an electric anti-reversal mechanism through a gear assembly. The manual anti-reversal mechanism includes: a first pawl, which is arranged on the opposite side of the saw teeth of the head body as a manual ratchet component; a first coil spring, which pushes the first pawl to the side engaged with the saw teeth; and a first spring receiving portion, which receives the base end side of the first coil spring. The electric anti-reversal mechanism, that is, the electric power on and off includes: a second pawl, which is an electric ratchet component arranged opposite to the ring gear; a second coil spring, which applies force to the second pawl to the side engaged with the ring gear; and a second spring seat, which receives the base end side of the second coil spring. The head shell is provided with a double pawl anti-reversal mechanism, which has a relatively complex structure and is not conducive to installation and maintenance. Summary of the Invention

[0003] The object to be achieved by the present invention is to provide an electric ratchet wrench, which solves the problem of the complicated structure of the electric ratchet wrench in the prior art and simplifies the structure of the electric ratchet wrench.

[0004] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solution: an electric ratchet wrench, comprising a handle provided with a driving motor and a head shell provided with a transmission shaft and an output head, a ratchet being rotatably mounted in the head shell, the ratchet being provided with a socket for mounting the output head, a pawl being slidably mounted in the head shell, a first elastic member being provided between the head shell and the pawl, the first elastic member applying a force toward the ratchet on the pawl so that the pawl always has a tendency to engage with the ratchet, the pawl cooperates with the ratchet to limit the ratchet to rotate in only one direction, the transmission shaft and the ratchet are connected through a gear assembly, the output shaft of the driving motor extends toward the head shell and is connected to the transmission shaft through a one-way clutch.

[0005] After adopting the above technical solution, the present invention has the following advantages: a gear assembly is used to realize the transmission connection between the transmission shaft and the ratchet, the traditional eccentric push block structure is abandoned, the dead point problem is avoided as much as possible, the operation efficiency is greatly improved, the kinetic energy output by the driving motor can be more fully utilized, and the transmission torque is increased; at the same time, in the manual operation mode, the ratchet and the slidable pawl arranged in the head shell are kept in contact and matched under the action of the first elastic member. When the user rotates the handle forward, the pawl is stuck in the ratchet teeth of the ratchet, driving the output head to rotate to complete the work; when the handle is rotated in the reverse direction, the pawl slides along the ratchet teeth to realize the head The relative backlash between the shell and the output head enables only one-way drive. In the electric operation mode, the drive motor is connected to the transmission shaft through a one-way clutch, allowing only one-way power transmission, effectively blocking the reverse load torque from being transmitted back to the motor, and realizing the electric reversal prevention function. Compared with the double-pawl anti-reversal mechanism with a complex structure in the head shell in the prior art, this application only requires a set of mechanical ratchet components to achieve manual anti-reversal, and cooperates with the one-way clutch to complete electric anti-reversal, which significantly simplifies the internal structure of the head shell, reduces the number of parts, and improves assembly efficiency and convenience of later maintenance.

[0006] Furthermore, the one-way clutch includes a first clutch member fixedly connected to one of the output shaft and the transmission shaft, and a second clutch member slidingly connected to the other of the output shaft and the transmission shaft. The second clutch member moves relative to the first clutch member to engage or disengage with the first clutch member, and a second elastic member is provided in the head shell to enable the second clutch member to have a movement tendency to counteract the first clutch member.

[0007] The above-mentioned technical solution can not only stably realize the precise on-off of power, but also the elastic force of the second elastic member can ensure the stability of the engagement of the first clutch member and the second clutch member to ensure the stability rate of power transmission.

[0008] Furthermore, the opposite ends of the first clutch member and the second clutch member are provided with mutually cooperating one-way meshing teeth, which engage and transmit in the power transmission direction and slide and disengage in the reverse power transmission direction.

[0009] By adopting the above-mentioned technical solution, the one-way engagement and reverse sliding characteristics of its own tooth shape can achieve automatic engagement in the power transmission direction and automatic disengagement in the reverse direction without the need for additional complex sensing, control or switching mechanisms.

[0010] Furthermore, the head shell is also provided with a positioning column, and the outer periphery of the transmission shaft is provided with an annular groove extending along the circumferential direction, and the positioning column is embedded in the annular groove to limit the axial movement of the transmission shaft.

[0011] Through the above technical solution, through the cooperation between the positioning column and the annular groove, under the premise that the circumferential free rotation is not affected, only the axial freedom of the transmission shaft is constrained, effectively limiting the axial movement of the transmission shaft, ensuring the flexible rotation of the transmission shaft during power transmission, and preventing its excessive movement in the axial direction, ensuring the stable engagement of the gear assembly as much as possible, and ensuring the cooperation between the first clutch member and the second clutch member as much as possible, thereby improving the operating stability and structural reliability of the transmission system.

[0012] Furthermore, the outer periphery of the ratchet is provided with a ratchet surface arranged along the circumferential direction, the inner side of the pawl is arranged in an arc shape and is provided with a pawl surface that can engage with the ratchet surface, and the outer side of the pawl is bent and is provided with a support surface that abuts against the first elastic member.

[0013] Through the above technical solution, the ratchet tooth surface on the outer periphery of the ratchet is evenly arranged along the circumference, and accurately matches the meshing tooth shape on the pawl surface, ensuring as much as possible stable and reliable torque transmission during engagement; the inner side of the pawl adopts an arc-shaped design, so that it forms a good curved surface fit with the outer periphery of the ratchet, reducing local stress concentration, improving contact strength, and at the same time reducing friction resistance during the slipping process of the pawl, improving the smoothness of tooth jumping; a bent structure and a support surface for abutting against the first elastic member are provided on the outer side of the pawl, so that the force of the first elastic member can be stably applied in a predetermined direction, ensuring as much as possible that the pawl always has a reset tendency toward the ratchet, thereby avoiding deflection or jamming as much as possible and improving the reliability of the action.

[0014] Furthermore, the head shell is provided with a sliding groove for the pawl to slide, and the pawl is provided with a guide surface that slides with the groove wall of the sliding groove.

[0015] Through the above technical solution, the cooperation between the sliding groove and the guide surface does not require an additional guide component, and the precise guidance of the pawl can be achieved only through direct contact between the two, which simplifies the internal structure of the head shell, reduces the number of parts, and reduces the difficulty of processing and assembly; during operation, the fitting sliding of the guide surface and the sliding groove wall can effectively limit the movement trajectory of the pawl, preventing the pawl from deflecting or getting stuck during operation as much as possible, thereby ensuring its reliable engagement and disengagement with the ratchet as much as possible, and improving the stability of the one-way transmission.

[0016] Furthermore, the guide surface and the support surface are not coplanar so that the outer side of the pawl forms a bent shape.

[0017] Through the above technical solution, by setting the guide surface and the support surface to be non-coplanar, the pawl is made into a bent structure as a whole, which can effectively realize functional zoning: the guide surface is used to cooperate with the guide structure on the head shell to ensure that the movement trajectory of the pawl is accurate and does not deflect during the sliding process; the support surface is used to abut against the first elastic member to ensure that the elastic force is stably applied in the predetermined direction as much as possible. The guide surface and the support surface are arranged in different planes, which makes the force transmission path more reasonable, avoids jamming or wear caused by eccentric force lines as much as possible, and improves movement flexibility and response reliability. At the same time, the bent structure is conducive to the compact arrangement of the first elastic member in a limited space, improves the utilization rate of the internal space of the head shell, and facilitates assembly and maintenance.

[0018] Furthermore, a limiting surface is provided on the pawl facing the direction of engagement with the ratchet, and a stop portion opposite to the limiting surface is provided in the sliding groove. When the pawl is in engagement with the ratchet, the stop portion cooperates with the limiting surface.

[0019] Through the above technical solution, by setting the limit surface and the stop cooperation of the stop part, the movement position of the pawl can be accurately limited when the pawl is engaged with the ratchet, preventing it from being offset due to over-travel or external force impact as much as possible, and ensuring the stable engagement state of the pawl and the ratchet.

[0020] Furthermore, the gear assembly includes a driving gear fixedly connected to the transmission shaft, and a driven gear fixedly connected to the ratchet, the driven gear is engaged with the driving gear, and the pawl and the driven gear are arranged vertically along the axial direction of the ratchet.

[0021] Through this technical solution, a gear transmission replaces the traditional eccentric mechanism, minimizing dead points in motion, achieving high transmission efficiency and high output torque. Furthermore, the pawl and driven gear are arranged vertically along the axial direction of the ratchet, providing a clear assembly and facilitating installation and maintenance. This fully utilizes the axial space within the head housing, resulting in a compact layout and rational structure that minimizes additional circumferential space occupation, contributing to a smaller overall head housing size and improved structural integration.

[0022] Furthermore, the drive motor has a forward rotation direction and a reverse rotation direction, and the handle is provided with a switch for controlling the forward and reverse rotation of the drive motor.

[0023] Through the above technical solution, the drive motor has forward and reverse directions, and a switch for controlling the forward and reverse rotation of the drive motor is provided on the handle. By switching the rotation direction of the drive motor, the two-way clutch structure of the one-way clutch can be adapted to realize the power output control of the tool in different directions. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described below in conjunction with the accompanying drawings:

[0025] Figure 1 It is a partial structural schematic diagram of the electric ratchet wrench of the present invention;

[0026] Figure 2 An exploded view of the electric ratchet wrench of the present invention;

[0027] Figure 3 Schematic diagram of the structure of the electric ratchet wrench of the present invention;

[0028] Figure 4 is a cross-sectional view of the electric ratchet wrench of the present invention;

[0029] Figure 5 A partial structural cross-sectional view of the head shell of the present invention;

[0030] Figure 6 It is a schematic structural diagram of the transmission shaft and the second clutch member of the present invention;

[0031] Figure 7 A schematic structural diagram of the first clutch member and the second clutch member of the present invention;

[0032] Figure 8 is a structural schematic diagram of the second clutch member of the present invention;

[0033] Figure 9 An exploded view of the head shell of the present invention;

[0034] Figure 10 A partial structural diagram of the head shell of the present invention;

[0035] Figure 11 It is a structural schematic diagram of the pawl of the present invention;

[0036] Figure 12 A top view of the head shell of the present invention;

[0037] Figure 13 It is a structural schematic diagram of the head shell of the present invention;

[0038] In the figure, 10, handle; 101, left shell; 102, right shell; 11, driving motor; 111, output shaft; 12, gear box; 13, switch; 14, control board; 15, battery; 16, motor end plate; 17, positioning plate; 20, first clutch; 21, second clutch; 211, special-shaped hole; 2111, connecting section; 2112, stop section; 212, limiting hole; 213, limiting step; 22, second elastic member; 23, one-way meshing tooth part; 231, protrusion; 232, groove; 233, first clutch surface; 234, second clutch surface; 24, stop member; 30, head shell; 31, transmission shaft; 311, special-shaped shaft section; 312, driving gear; 313, annular groove; 32, ratchet wheel; 321, insertion hole; 322, ratchet surface; 33, pawl; 331, guide surface; 332, pawl surface; 333, support surface; 334, limiting surface; 34, first elastic member; 35, sliding groove; 351, stop portion; 361, upper cover plate; 362, lower cover plate; 37, snap ring; 38, driven gear; 39, positioning column. DETAILED DESCRIPTION

[0039] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application.

[0040] The terms "first", "second", "third", "fourth" and the like in the description, claims, and drawings of the present application, and the above-mentioned drawings, if any, are used to distinguish similar objects, and do not necessarily indicate a particular order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0041] It should be understood that, in various embodiments of the present application, the magnitude of the serial numbers as related to the processes does not mean the order of execution, and the execution order of the processes should be determined according to their functions and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0042] It should be understood that in the present application, "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not necessarily limit to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0043] It should be understood that in the present invention, "plurality" refers to two or more. "And / or" is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, X and / or Y can represent three situations: X exists alone, X and Y exist at the same time, and Y exists alone. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "Including X, Y and Z" and "Including X, Y, Z" means that X, Y, and Z are all included. "Including X, Y or Z" means that one of X, Y, and Z is included. "Including X, Y and / or Z" means that any one, any two, or any three of X, Y, and Z are included.

[0044] The following specific embodiments are used to describe the technical solution of the present invention in detail. The following specific embodiments can be combined or replaced with each other according to actual conditions, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0045] like Figures 1 to 13 As shown, the present invention provides an electric ratchet wrench, including a handle 10 provided with a drive motor 11 and a head shell 30 provided with a transmission shaft 31 and an output head, a ratchet 32 ​​is rotatably installed in the head shell 30, the ratchet 32 ​​is provided with a socket 321 for installing the output head, a pawl 33 is slidably installed in the head shell 30, a first elastic member 34 is provided between the head shell 30 and the pawl 33, the first elastic member 34 applies a force toward the ratchet 32 ​​on the pawl 33, so that the pawl 33 always has a tendency to engage with the ratchet 32, the pawl 33 cooperates with the ratchet 32 ​​to limit the ratchet 32 ​​to rotate only in one direction, the transmission shaft 31 and the ratchet 32 ​​are connected through a gear assembly, and the output shaft 111 of the drive motor 11 extends toward the head shell 30 and is connected to the transmission shaft 31 through a one-way clutch.

[0046] The gear assembly is used to realize the transmission connection between the transmission shaft 31 and the ratchet 32, which abandons the traditional eccentric push block structure, effectively avoids the dead point problem, greatly improves the operation efficiency, can make fuller use of the output kinetic energy of the drive motor 11, and significantly increases the transmission torque; at the same time, in the manual operation mode, the ratchet 32 ​​and the slidable pawl 33 arranged in the head shell 30 maintain contact and cooperation under the action of the first elastic member 34. When the user rotates the handle 10 in the forward direction, the pawl 33 is stuck in the ratchet teeth of the ratchet 32, driving the output head to rotate to complete the twisting of the workpiece; when the handle 10 is rotated in the reverse direction, the pawl 33 slides along the ratchet teeth to realize the head shell 30 and the output head have relative backlash, thereby realizing manual anti-reversal. In electric operation mode, the drive motor 11 is connected to the transmission shaft 31 through a one-way clutch, and only one-way power transmission is allowed, which effectively blocks the reverse load torque from being transmitted back to the motor, thereby realizing the electric anti-reversal function. Compared with the prior art in which the head shell 30 is provided with a complex double-pawl anti-reversal mechanism, the present application only requires a set of mechanical ratchet and pawl assemblies to realize manual anti-reversal, and cooperates with the one-way clutch to complete electric anti-reversal, which significantly simplifies the internal structure of the head shell 30, reduces the number of parts, and improves assembly efficiency and convenience of later maintenance.

[0047] It should be noted that in this embodiment, the jack 321 is connected up and down, and the output head can be installed on both the front and back sides of the jack 321. When the output head is installed on the front and back sides respectively, the torque applied to the workpiece can be switched between the front and back sides.

[0048] The handle 10 consists of a left housing 101 and a right housing 102. The handle 10 is also provided with a control board 14, a battery 15, a motor end plate 16, and a positioning plate 17. The control board 14 and the battery 15 are electrically connected, and the output shaft 111 of the drive motor 11 is sleeved on the motor end plate 16.

[0049] The drive motor 11 has forward and reverse rotation directions, and a switch 13 is provided on the handle 10 to control the forward and reverse rotation of the drive motor 11. By switching the rotation direction of the drive motor 11, the bidirectional clutch structure of the one-way clutch can be adapted to achieve power output control in different directions of the tool. The switch 13 is mounted on the positioning plate 17. It should be noted that in this embodiment, the drive motor 11 only needs to rotate in one direction.

[0050] The one-way clutch includes a first clutch member 20 fixedly connected to one of the output shaft 111 and the transmission shaft 31, and a second clutch member 21 slidingly connected to the other of the output shaft 111 and the transmission shaft 31. The second clutch member 21 moves relative to the first clutch member 20 to engage or disengage with the first clutch member 20. A second elastic member 22 is provided in the head shell 30 to enable the second clutch member 21 to have a movement tendency to counteract the first clutch member 20, thereby reducing the possibility of slipping between the second clutch member 21 and the first clutch member 20 and making power transmission more stable and reliable.

[0051] Among them, the opposite ends of the first clutch member 20 and the second clutch member 21 are provided with one-way meshing tooth portions 23 that can cooperate with each other. The one-way meshing tooth portions 23 engage and transmit in the direction of power transmission and slide and disengage in the reverse direction of power transmission. Through the one-way engagement and reverse sliding characteristics of its own tooth shape, it can achieve automatic engagement in the direction of power transmission and automatic disengagement in the reverse direction without the need for additional complex sensing, control or switching mechanisms.

[0052] In this embodiment, the first clutch member 20 is fixedly connected to the output shaft 111, and the transmission shaft 31 is slidably connected to the second clutch member 21. In order to prevent the transmission shaft 31 from circumferentially slipping or dislocating during the transmission process, the transmission shaft 31 is provided with a special-shaped shaft section 311, and the second clutch member 21 is provided with a special-shaped hole 211 that cooperates with the special-shaped shaft section 311. The special-shaped shaft section 311 is inserted into the special-shaped hole 211. While ensuring that the second clutch member 21 can slide axially, it can reliably transmit torque and prevent it from circumferentially slipping or dislocating during the transmission process, thereby ensuring stable power transmission; at the same time, the structural form is simple and the cooperation is reliable, which avoids the problems of complex structure, high processing difficulty, and inconvenient assembly brought about by traditional key connections or spline connections as much as possible; in addition, the cooperation between the special-shaped shaft section 311 and the special-shaped hole 211 also provides precise guiding for the engagement and disengagement of the one-way clutch.

[0053] The one-way meshing tooth portion 23 includes a plurality of circumferentially distributed protrusions 231 and grooves 232. A groove 232 is formed between adjacent protrusions 231, and its two inclined surfaces are a first clutch surface 233 and a second clutch surface 234. The first clutch surface 233 is arranged outwardly relative to the bottom of the groove 232, i.e., at an angle greater than 90°, forming a guide slope. The second clutch surface 234 is arranged inwardly relative to the bottom of the groove 232, i.e., at an angle less than 90°, forming a load-bearing support surface. When the drive motor 11 drives the first clutch member 20 to rotate along the first clutch surface 233, the mating protrusion 231 on the second clutch member 21 contacts the sloped surface, generating thrust along the slope during relative motion, pushing the second clutch member 21 to overcome the preload of the second elastic member 22 and move axially, achieving disengagement and idling.

[0054] When the driving motor 11 drives the first clutch member 20 to rotate along the direction of the second clutch surface 234, the matching protrusion 231 on the second clutch member 21 quickly slides into the groove 232 and forms surface contact with the second clutch surface 234. At this time, the two tooth surfaces are wedged against each other, the torque is reliably transmitted, and power engagement is achieved.

[0055] Of course, it is understandable that in other embodiments, the second clutch member 21 can also be slidably connected to the output shaft 111, the first clutch member 20 is fixedly connected to the transmission shaft 31, and the second elastic member 22 acts on the second clutch member 21, so that the first clutch member 20 has a movement tendency to maintain resistance with the second clutch member 21, and the tooth surfaces of the two are engaged to limit the second clutch member 21 from disengaging from the output shaft 111.

[0056] Among them, a stopper 24 and a second elastic member 22 are axially spaced apart on the special-shaped shaft section 311, and the second clutch member 21 is arranged between the stopper 24 and the second elastic member 22. The second elastic member 22 provides a continuous reset force for the second clutch member 21, so that it automatically resets to a preset position when there is no external force, ensuring stable engagement with the first clutch member 20. The stopper 24 plays an axial limiting role to prevent the second clutch member 21 from falling out during the sliding process, thereby improving the safety and reliability of the structure.

[0057] It should be noted that the cross section of the special-shaped hole 211 includes a connecting section 2111 for guiding and a stop section 2112 for stopping rotation. The connecting section 2111 is circular and the stop section 2112 is linear. A structure of the same shape is provided on the transmission shaft 31.

[0058] It should be noted that the second clutch member 21 is provided with a limiting hole 212 that communicates with the shaped hole 211. The limiting hole 212 is located at the end of the shaped hole 211 away from the second elastic member 22 and has a larger diameter than the shaped hole 211, thereby forming a limiting step 213 at the connection point. A stopper 24 is disposed within the limiting hole 212, enabling concealed installation, which helps reduce the overall structural space and improves the compactness of the layout. Furthermore, the tooth surface structure is arranged in an annular shape around the outer periphery of the limiting hole 212 of the second clutch member 21. The second elastic member 22 can be a compression spring sleeved on the shaped shaft, and the stopper 24 can be a retaining spring.

[0059] It should be noted that the output shaft 111 of the drive motor 11 is connected to the gear box 12, and the output shaft 111 of the drive motor 11 is fixedly connected to the first clutch member 20 through the gear box 12. The gear box 12 increases the output torque of the drive motor 11 by setting a small gear to drive a large gear.

[0060] Specifically, the head housing 30 is further provided with a positioning post 39. A circumferentially extending annular groove 313 is defined on the outer periphery of the transmission shaft 31. The positioning post 39 is embedded in the annular groove 313 to limit axial movement of the transmission shaft 31. While maintaining circumferential free rotation, only the axial freedom of the transmission shaft 31 is constrained, effectively limiting axial movement of the transmission shaft 31. This ensures flexible rotation of the transmission shaft 31 during power transmission while preventing excessive axial movement. This maximizes the meshing stability of the gear assembly and the coordination between the first clutch member 20 and the second clutch member 21, improving the operational smoothness and structural reliability of the transmission system.

[0061] The other end of the transmission shaft 31 is provided with a driving gear 312, and the ratchet 32 ​​is provided with a driven gear 38 that cooperates with the driving gear 312. The driven gear 38 and the driving gear 312 form a gear assembly between the transmission shaft 31 and the ratchet 32. The driven gear 38 and the driving gear 312 are connected by a spline. Due to the arrangement of the first clutch 20 and the second clutch 21, the torque rotation direction of the transmission shaft 31 is only in one direction. When electrically driven, the ratchet 32 ​​can only rotate in one direction. In order to achieve torque output in different directions, the forward and reverse switching of the torque can be achieved by flipping the electric ratchet wrench. Among them, the driving gear 312 is a bevel gear, the driving gear 312 and the transmission shaft 31 are integrally formed, and the driven gear 38 is a ring gear.

[0062] Among them, the outer periphery of the ratchet 32 ​​is provided with a ratchet surface 322 arranged along the circumferential direction, the inner side of the pawl 33 is arranged in an arc shape, and is provided with a pawl surface 332 that can engage with the ratchet surface 322, so that it forms a good curved surface fit with the outer periphery of the ratchet 32, reducing local stress concentration, and improving contact strength. At the same time, during the slipping process of the pawl 33, the friction resistance is reduced and the smoothness of tooth jumping is improved. The outer side of the pawl 33 is bent and is provided with a support surface 333 that abuts against the first elastic member 34, so that the force of the first elastic member 34 can be stably applied in a predetermined direction, ensuring as much as possible that the pawl 33 always has a reset tendency toward the ratchet 32, thereby avoiding deflection or jamming as much as possible and improving the reliability of the action.

[0063] The head shell 30 is provided with a sliding groove 35 for the pawl 33 to slide, and the pawl 33 is provided with a guide surface 331 that slides with the groove wall of the sliding groove 35. No additional guiding components are required, and the pawl 33 can be accurately guided only through direct contact between the two, which simplifies the internal structure of the head shell 30, reduces the number of parts, and reduces the difficulty of processing and assembly; during operation, the sliding fit between the guide surface 331 and the groove wall of the sliding groove 35 can effectively limit the movement trajectory of the pawl 33, and prevent the pawl 33 from being offset or stuck during operation as much as possible, thereby ensuring its reliable engagement and disengagement with the ratchet 32 ​​as much as possible, and improving the stability of the one-way transmission.

[0064] Among them, the guide surface 331 and the support surface 333 are not coplanar so that the outer side of the pawl 33 forms a bend. It can effectively realize functional zoning: the guide surface 331 is used to cooperate with the guide structure on the head shell 30 to ensure that the movement trajectory of the pawl 33 is accurate and does not deflect during the sliding process; the support surface 333 is used to abut against the first elastic member 34 to ensure that the elastic force is stably applied along the predetermined direction as much as possible. The guide surface 331 and the support surface 333 are arranged in different planes, which makes the force transmission path more reasonable, avoids jamming or wear caused by eccentric force lines as much as possible, and improves movement flexibility and response reliability. At the same time, the bending structure is conducive to the compact arrangement of elastic parts in a limited space, improves the internal space utilization of the head shell 30, and facilitates assembly and maintenance.

[0065] A limiting surface 334 is provided on the pawl 33 in the direction of engagement with the ratchet 32, and a stop portion 351 opposite to the limiting surface 334 is provided in the sliding groove 35. When the pawl 33 is in engagement with the ratchet 32, the stop portion 351 cooperates with the limiting surface 334 to prevent it from deflecting due to overtravel or external force impact as much as possible, thereby ensuring a stable engagement state of the pawl 33 and the ratchet 32.

[0066] It should be noted that the pawl 33 and the driven gear 38 are arranged up and down along the axial direction of the ratchet 32, separated from each other, clearly assembled, easy to install and maintain, and make full use of the axial space inside the head shell 30. The layout is compact and the structure is reasonable. Extra occupation of the circumferential space is avoided as much as possible, which is conducive to reducing the overall size of the head shell 30 and improving the structural integration. An upper cover plate 361 is provided on the top of the pawl 33 to limit it, and the bottom of the pawl 33 is supported on the bottom surface of the sliding groove 35. A retaining ring 37 and a lower cover plate 362 are provided on the bottom of the gear ring to limit it.

[0067] It should be noted that the first elastic member 34 is a spring, which can be wavy. The wavy spring has good elastic deformation ability and reset performance, and can provide a continuous and stable elastic force for the pawl 33, ensuring that the pawl 33 always has a tendency to engage with the ratchet 32; compared with traditional elastic elements such as coil springs, the spring structure is flatter, which is conducive to reducing the space occupied inside the head shell 30 and making the overall structure more compact; at the same time, the spring is easy to process and easy to assemble, which can effectively reduce manufacturing costs and assembly difficulty; in addition, the wavy structure has multi-point support and buffering effects when subjected to force, which can effectively absorb vibration and impact, and improve the stability and service life of the ratchet 32 ​​component during frequent engagement and separation.

[0068] Of course, in other embodiments, the spring piece may also be V-shaped, U-shaped, arched, or other structural forms with elastic deformation capabilities. Spring pieces of different shapes can be flexibly selected according to the actual spatial layout, assembly method, and elasticity requirements, further improving the adaptability of the structural design and process flexibility.

[0069] In this embodiment, two pawls 33 are provided, and the two pawls 33 are symmetrically arranged in the axial direction of the ratchet 32. Working together can improve the reliability of one-way locking, and can also disperse the torque transmitted by the ratchet 32 ​​to different positions, thereby avoiding as much as possible the wear or deformation of a single pawl 33 due to excessive force.

[0070] The electric ratchet wrench in this embodiment has two modes of use: electric drive and manual drive. When the electric ratchet wrench is in electric drive rotation, after the output head is installed in the socket 321, the user controls the drive motor 11 by pressing the switch 13 to turn on. The drive motor 11 drives the output shaft 111 to rotate. At this time, the one-way meshing teeth 23 of the first clutch 20 and the one-way meshing teeth 23 of the second clutch 21 engage. The power of the output shaft 111 drives the ratchet 32 ​​to rotate relative to the head shell 30 through the transmission shaft 31. The ratchet surface 322 of the ratchet 32 ​​drives the pawl 33 to move in the direction of the compressed spring. The pawl 33 disengages the ratchet 32, and the output head rotates synchronously with the ratchet 32 ​​to tighten the workpiece. If the workpiece needs to be loosened, the direction of the electric ratchet wrench needs to be reversed and the output head needs to be installed in the socket 321 in the opposite direction. At this time, the output head drives the workpiece to rotate in the opposite direction, thereby loosening the workpiece.

[0071] When the electric ratchet wrench is in manual drive, the drive motor 11 is not started, and the user manually controls the handle 10 to drive the workpiece to rotate. In the rotation direction of the handle 10, the ratchet 32 ​​and the pawl 33 are engaged and limited to keep the ratchet 32 ​​and the head shell 30 relatively fixed. Therefore, the user can drive the workpiece to rotate by turning the handle 10. Manual drive can make the installation of the workpiece more compact, and can also loosen the stuck workpiece, and avoid the possibility of damage to the drive motor 11 due to excessive load; in the process of manual drive, after the user drives the handle 10 to rotate a certain angle, in order to make it easier for the user to apply force, the user can drive the handle 10 to rotate in the opposite direction. In the rotation direction of the handle 10, the ratchet 32 ​​and the pawl 33 form a sliding fit, and the ratchet 32 ​​and the head shell 30 can rotate relative to each other, and the ratchet 32 ​​will drive the transmission shaft 31 to rotate in the opposite direction. At this time, the one-way meshing tooth portion 23 of the first clutch 20 and the one-way meshing tooth portion 23 of the second clutch 21 are disengaged, and will not drive the drive motor 11 to rotate. During manual driving, the reversing function can also be achieved by changing the direction of the output head installation.

[0072] It is understandable that in other embodiments, only one ratchet may be provided, which is the simplest structure and easy to assemble. Of course, three or four ratchet pawls may also be provided, and the coordinated operation of multiple ratchet pawls can improve the reliability of the one-way locking.

[0073] In addition to the above-mentioned preferred embodiments, the present invention has other implementation modes. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection requested by the present invention.

Claims

1. An electric ratchet wrench, comprising a handle (10) provided with a drive motor (11) and a head shell (30) provided with a transmission shaft (31) and an output head, characterized in that: A ratchet (32) is rotatably mounted in the head shell (30), and the ratchet (32) is provided with a socket (321) for mounting an output head. A pawl (33) is slidably mounted in the head shell (30), and a first elastic member (34) is provided between the head shell (30) and the pawl (33). The first elastic member (34) applies a force in the direction of the ratchet (32) to the pawl (33), so that the pawl (33) always has a tendency to engage with the ratchet (32). The pawl (33) cooperates with the ratchet (32) to limit the ratchet (32) to rotate in only one direction. The transmission shaft (31) and the ratchet (32) are connected to each other through a gear assembly. The output shaft (111) of the drive motor (11) extends toward the head shell (30) and is connected to the transmission shaft (31) through a one-way clutch.

2. The electric ratchet wrench according to claim 1, characterized in that: The one-way clutch comprises a first clutch member (20) fixedly connected to one of the output shaft (111) and the transmission shaft (31), and a second clutch member (21) slidably connected to the other of the output shaft (111) and the transmission shaft (31). The second clutch member (21) moves relative to the first clutch member (20) to engage with or disengage from the first clutch member (20). A second elastic member (22) is provided in the head shell (30) to enable the second clutch member (21) to have a movement tendency to resist the first clutch member (20).

3. The electric ratchet wrench according to claim 2, characterized in that: The opposite ends of the first clutch member (20) and the second clutch member (21) are provided with mutually matching one-way meshing teeth (23), which engage and transmit in the power transmission direction and slide and disengage in the reverse direction of power transmission.

4. The electric ratchet wrench according to claim 1, characterized in that: The head shell (30) is further provided with a positioning column (39), and the outer periphery of the transmission shaft (31) is provided with an annular groove (313) extending in the circumferential direction. The positioning column (39) is embedded in the annular groove (313) to limit the axial movement of the transmission shaft (31).

5. The electric ratchet wrench according to claim 1, characterized in that: The outer periphery of the ratchet (32) is provided with a ratchet surface (322) arranged along the circumferential direction; the inner side of the pawl (33) is arranged in an arc shape and is provided with a pawl surface (332) that can engage with the ratchet surface (322); the outer side of the pawl (33) is bent and is provided with a supporting surface (333) that abuts against the first elastic member (34).

6. The electric ratchet wrench according to claim 5, characterized in that: The head shell (30) is provided with a sliding groove (35) for the pawl (33) to slide, and the outer side of the pawl (33) is also provided with a guide surface (331) that is slidably matched with the groove wall of the sliding groove (35).

7. The electric ratchet wrench according to claim 6, characterized in that: The guide surface (331) and the support surface (333) are not coplanar so that the outer side of the pawl (33) forms a bent shape.

8. The electric ratchet wrench according to claim 6, characterized in that: A limiting surface (334) is provided on the pawl (33) in the direction of engagement with the ratchet (32), and a stop portion (351) opposite to the limiting surface (334) is provided in the sliding groove (35). When the pawl (33) is in engagement with the ratchet (32), the stop portion (351) engages with the limiting surface (334).

9. The electric ratchet wrench according to claim 1, characterized in that: The gear assembly comprises a driving gear (312) fixedly connected to a transmission shaft (31), and a driven gear (38) fixedly connected to a ratchet (32); the driven gear (38) is meshed with the driving gear (312); the ratchet pawl (33) and the driven gear (38) are arranged vertically along the axial direction of the ratchet (32).

10. The electric ratchet wrench according to claim 1, characterized in that: The driving motor (11) has a forward rotation direction and a reverse rotation direction, and the handle (10) is provided with a switch (13) for controlling the forward and reverse rotation of the driving motor (11).

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