Lithium battery wrench

Abstract

The application discloses a lithium electric wrench and relates to the technical field of lithium electric wrenches; specifically comprising an outer shell, a handle is arranged at the bottom of one side of the outer shell, a detachable lithium battery is arranged at the bottom of the handle, a driving part and an impact part which is driven by the driving part through a transmission part are arranged in the outer shell, a multifunctional chuck for connecting an inner recessed wrench or an outer convex wrench is arranged on the outer side of the outer shell, and the multifunctional chuck is connected to the power output end of the impact part. The multifunctional chuck is designed in a targeted manner, which can limit the inner recessed wrench type by using the outer cylinder and the elastic protrusion on one side, and can also limit the outer convex wrench type by using the clamping piece and the elastic protrusion on the other side, thereby solving the limitations of the prior art, increasing the functionality of the device, and meanwhile, the outer cylinder serves as a power driving part of the inner recessed wrench on one side and also serves as a power driving part for clamping the clamping piece, thereby saving component arrangement.

Description

Technical Field

[0001] This invention relates to the field of lithium battery wrench technology, and more particularly to a lithium battery wrench. Background Technology

[0002] Lithium-ion battery wrenches, as a common power tool, are widely used in mechanical assembly, automotive repair, and construction installation. With the continuous advancement of lithium battery technology, lithium-ion battery-powered electric wrenches, due to their advantages such as portability, flexible operation, and no need for external power supply, have gradually replaced some traditional pneumatic wrenches and AC electric wrenches. Currently, lithium-ion battery wrenches on the market typically include a motor, gear transmission mechanism, striking block assembly, and a rechargeable lithium battery pack. The motor is driven by a trigger, ultimately achieving the function of tightening or loosening bolts, nuts, and other fasteners.

[0003] In the existing technology, most power tools that work with wrenches are of two types: One type is a screwdriver-like thin wrench (such as a single-pronged wrench or a Phillips head wrench, referred to as an externally convex wrench in the manual), which is used with power tools in an external clamping manner, such as the working head structure in the patent with Chinese patent publication number CN220128658U.

[0004] Another type is the socket-type coarse wrench (such as an external hex wrench, referred to as a concave wrench in the manual), which is used with power tools in an internal clamping manner, such as the directional boss structure in the Chinese patent publication number CN104175270B.

[0005] This means that it cannot be fully compatible with both screwdriver wrenches and socket wrenches, which limits its compatibility. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of existing technologies by proposing a lithium-ion battery wrench.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A lithium-ion battery wrench includes a housing, a handle at the bottom of one side of the housing, a removable lithium battery at the bottom of the handle, a drive unit and an impact unit connected to the output end of the drive unit via a transmission unit inside the housing, a multi-functional chuck for connecting a concave wrench or a convex wrench on the outside of the housing, and the multi-functional chuck is connected to the power output end of the impact unit, and a controller is provided on one side of the handle, through which the removable lithium battery is electrically connected to the power input end of the drive unit; The multi-functional chuck includes a sleeve fixed to the power output end of the impact part, an outer cylinder axially slidably connected to the outer wall of the sleeve, and multiple clamping pieces fixed to the end of the sleeve. The outer contour of the outer cylinder matches the inner contour of the recessed part of the concave wrench, the inner contour of the multiple clamping pieces matches the outer contour of the protruding part of the convex wrench, and the inner wall of the opening of the outer cylinder matches the outer wall of the clamping pieces through a slope.

[0008] Preferably, the outer wall of the outer cylinder is provided with an elastic protrusion 1, which matches the groove 1 provided at the recess of the inner wrench; the inner wall of the clamping piece is provided with an elastic protrusion 2, which matches the groove 2 at the protrusion of the outer wrench.

[0009] Furthermore, one end of the outer cylinder is fastened with a spring, and the other end of the spring is fastened to the outer wall of the sleeve shaft.

[0010] Based on the aforementioned scheme: the impact part includes a shell and an inner shell. A main shaft is coaxially fixed on the inner side of the inner shell. One end of the main shaft is fixedly connected to the shell shaft. The main shaft is rotatably connected to the inner wall of the outer shell. An impact pawl is fixed on the outer wall of the main shaft. The shell is located on the outer wall of the inner shell. Multiple spiral grooves are opened on the outer side wall of the inner shell. Ball bearings are fitted together on the inner wall of the shell and the inner wall of the spiral grooves.

[0011] A preferred embodiment of the aforementioned scheme is that a transition ring is rotatably connected to the inner wall of one end of the casing, and the end face of the transition ring is connected to the end face of the inner casing via a connecting shaft.

[0012] As a further aspect of the present invention: the transmission part includes an external gear ring, a sun gear and a plurality of planet gears. The external gear ring is rotatably connected to the inner wall of the outer casing through a bearing. The plurality of planet gears are meshed in an array with the inner sidewall of the external gear ring, and the sun gear meshes with the inner sidewall of the plurality of planet gears.

[0013] Meanwhile, one side of the external gear ring is connected to the output end of the drive unit via a connecting claw, the sun gear is fixedly connected to one end of the main shaft, and the multiple planet gears are respectively rotated and axially slidably connected to one side of the housing via a connecting shaft.

[0014] As a preferred embodiment of the present invention: the drive unit includes a rotor and a stator that cooperate with each other, the stator is fixed to the inner wall of the outer casing, the inner wall of the rotor is fixed with a rotor shaft, the rotor shaft is rotatably connected to the inner wall of the outer casing, and the outer wall of the rotor shaft is connected to the outer gear ring through a connecting claw.

[0015] Meanwhile, the power input terminal of the stator is connected to a removable lithium battery via a controller.

[0016] As a preferred embodiment of the present invention: a cooling fan is fixed to the outer wall of the rotor shaft, and a grille is provided at the rear end of the outer casing.

[0017] The beneficial effects of this invention are as follows: 1. This invention, through targeted design of a multi-functional chuck, can, on the one hand, utilize the outer cylinder and the elastic protrusion to limit the concave wrench type, and on the other hand, utilize the clamping piece to limit the convex wrench type on the elastic protrusion, thereby overcoming the limitations of the prior art and increasing the functionality of the device. At the same time, the outer cylinder serves as both a power drive component for the concave wrench and a power drive component for clamping the clamping piece, thereby saving on component layout.

[0018] 2. In this invention, by setting an impact part, when the multi-functional chuck is subjected to large rotational resistance, the axial movement of the inner shell causes the impact pawl one and impact pawl two to repeatedly engage and disengage, thereby applying vibration to the multi-functional chuck by using the axial and circumferential impacts during the disengagement process, and then using the vibration to loosen it.

[0019] 3. This invention, by setting up a transmission unit based on a "star gear set" design, utilizes its dual open degrees of freedom design to prevent the drive unit from jamming regardless of whether the main shaft can rotate, thereby preventing the drive unit from burning out. On the other hand, its dual degrees of freedom design also allows the impact of the impact unit to automatically start and stop based entirely on the resistance of the main shaft. At the same time, since the torque transmission is continuous during the impact process, that is, the main shaft is continuously subjected to torque, and the impact pawl one and impact pawl two are also subjected to torque impact, it can be ensured that when the main shaft is jammed due to high resistance, the impact force it receives is large, which can ensure instantaneous twisting at the moment of loosening, thus increasing reliability.

[0020] 4. This invention, by setting up components such as rotor, stator, and cooling fan, enables the cooling fan to guide air through the shell and exhaust it through the grille during the operation of the lithium battery wrench, thereby achieving a heat dissipation effect and ensuring the reliability of the lithium battery wrench. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of a lithium-ion battery wrench proposed in this invention; Figure 2 This is a cross-sectional view of the multi-functional chuck and concave wrench of a lithium battery wrench proposed in this invention. Figure 3 This is a cross-sectional view of the multi-functional chuck and the protruding wrench of a lithium battery wrench proposed in this invention. Figure 4 This is a schematic diagram of the impact section structure of a lithium-ion battery wrench proposed in this invention; Figure 5 This is a schematic diagram of the impact pawl one and impact pawl two of a lithium battery wrench proposed in this invention. Figure 6 This is a schematic diagram of the transmission and drive parts of a lithium-ion battery wrench proposed in this invention; Figure 7 This is a schematic diagram of a cooling fan structure for a lithium battery wrench proposed in this invention.

[0022] In the diagram: 1. Outer shell; 2. Controller; 3. Handle; 4. Removable lithium battery; 5. Drive unit; 6. Transmission unit; 7. Impact unit; 8. Multi-functional chuck; 9. Sleeve shaft; 10. Spring; 11. Outer cylinder; 12. Inclined surface; 13. Elastic protrusion one; 14. Clamping plate; 15. Concave wrench; 16. Slot one; 17. Protruding wrench; 18. Slot two; 19. Elastic protrusion two; 20. Main shaft; 21. Transition ring; 22. Outer shell; 23. Impact pawl one; 24. Impact pawl two; 25. Ball bearing; 26. Spiral groove; 27. Inner shell; 28. Connecting shaft; 29. ​​Planetary gear; 30. External gear ring; 31. Rotor; 32. Rotor shaft; 33. Stator; 34. Connecting claw; 35. Sun gear; 36. Cooling fan; 37. Grille. Detailed Implementation

[0023] The technical solution of the present invention will be further described in detail below with reference to specific embodiments.

[0024] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0025] Example 1:

[0026] A lithium-ion battery wrench, such as Figures 1-7 As shown, the device includes a housing 1, a handle 3 at the bottom of one side of the housing 1, a removable lithium battery 4 at the bottom of the handle 3, a drive unit 5 inside the housing 1 and an impact unit 7 connected to the output end of the drive unit 5 via a transmission unit 6, a multi-functional chuck 8 for connecting a concave wrench 15 or a convex wrench 17 on the outside of the housing 1, and the multi-functional chuck 8 is connected to the power output end of the impact unit 7, a controller 2 on one side of the handle 3, and the removable lithium battery 4 is electrically connected to the power input end of the drive unit 5 via the controller 2.

[0027] The multi-functional chuck 8 includes a sleeve 9 fixed to the power output end of the impact part 7, an outer cylinder 11 axially slidably connected to the outer wall of the sleeve 9, and a plurality of clamping pieces 14 fixed to the end of the sleeve 9.

[0028] The outer contour of the outer cylinder 11 matches the inner contour of the recessed part of the concave wrench 15, the inner contour of the plurality of clamping pieces 14 matches the outer contour of the protruding part of the convex wrench 17, and the inner wall of the opening of the outer cylinder 11 matches the outer wall of the clamping piece 14 through the inclined surface 12.

[0029] The outer wall of the outer cylinder 11 is provided with an elastic protrusion 13, which matches the groove 16 provided at the recess of the inner wrench 15. The inner wall of the clamping piece 14 is provided with an elastic protrusion 19, which matches the groove 18 at the protrusion of the outer wrench 17.

[0030] Furthermore, one end of the outer cylinder 11 is fastened with a spring 10, and the other end of the spring 10 is fastened to the outer wall of the sleeve shaft 9.

[0031] When using this device, if the recessed wrench 15 is needed, simply align the recessed part of the recessed wrench 15 with the outer contour of the outer cylinder 11, and then insert the outer cylinder 11 into the inner contour of the recessed wrench 15, with the elastic protrusion 13 matching the slot 16. When the convex wrench 17 is needed, the outer cylinder 11 is aligned with the... Figure 3 The wrench moves to the right, at which point the limiting effect of the inclined plane 12 on the clamping plate 14 is eliminated, and the clamping plate 14 expands outward under its own elastic force. Then, after inserting the protrusion of the outer wrench 17 into the multiple clamping plates 14, the outer cylinder 11 is released. The outer cylinder 11 is subjected to the elastic force of the spring 10 and the matching inclined plane 12, so that the multiple clamping plates 14 hold the protrusion of the outer wrench 17. The outer wrench 17 is limited by the matching of the elastic protrusion 19 and the slot 18. After the inner wrench 15 or the outer wrench 17 is limited, the handle 3 can be held. When the controller 2 is pressed, the detachable lithium battery 4 supplies power to the drive unit 5, so that the drive unit 5 is started. Then, the multi-functional chuck 8 is rotated through the transmission unit 6 and the impact unit 7, thereby realizing the disassembly and assembly operation.

[0032] This device, through a targeted design of the multi-functional chuck 8, can limit the concave wrench 15 type using the outer cylinder 11 and the elastic protrusion 13, and can also limit the convex wrench 17 type using the clamping piece 14 and the elastic protrusion 19. This solves the limitations of the prior art and increases the functionality of the device. At the same time, the outer cylinder 11 serves as both the power drive for the concave wrench 15 and the power drive for clamping the clamping piece 14, thus saving on component arrangement.

[0033] Example 2:

[0034] A lithium-ion battery wrench, such as Figures 1-7As shown, in order to solve the driving problem, this embodiment makes the following improvements based on embodiment 1: The impact part 7 includes a sleeve 22 and an inner shell 27. A main shaft 20 is coaxially fixed on the inner side of the inner shell 27. One end of the main shaft 20 is fixedly connected to the sleeve shaft 9. The main shaft 20 is rotatably connected to the inner wall of the outer shell 1. An impact pawl 23 is fixed on the outer wall of the main shaft 20. The sleeve 22 is located on the outer wall of the inner shell 27. A plurality of spiral grooves 26 are opened on the outer side wall of the inner shell 27. The inner wall of the sleeve 22 and the inner wall of the spiral grooves 26 are fitted with balls 25.

[0035] A transition ring 21 is rotatably connected to the inner wall of one end of the casing 22, and the end face of the transition ring 21 is connected to the end face of the inner casing 27 by a connecting shaft 28.

[0036] The transmission unit 6 includes an external gear ring 30, a sun gear 35, and a plurality of planet gears 29. The external gear ring 30 is rotatably connected to the inner wall of the outer casing 1 via bearings. The plurality of planet gears 29 are meshed in an array with the inner sidewall of the external gear ring 30, and the sun gear 35 is meshed with the inner sidewall of the plurality of planet gears 29.

[0037] One side of the external gear ring 30 is connected to the output end of the drive unit 5 via a connecting claw 34. The sun gear 35 is fixedly connected to one end of the main shaft 20, and the multiple planet gears 29 are respectively rotated and axially slidably connected to one side of the housing 22 via a connecting shaft 28.

[0038] When the drive unit 5 starts, it applies a rotational torque to the external gear ring 30 through the connecting claw 34, thereby applying a rotational torque to it. When the external gear ring 30 receives a rotational torque, it applies the torque to the planetary gears 29, giving the planetary gears 29 both rotational and revolution torques. The revolution torque is transmitted to the housing 22 through the connecting shaft 28. On the other hand, the torque of the planetary gears 29 is also transmitted to the sun gear 35, causing the sun gear 35 to receive a rotational torque. The rotational torque received by the sun gear 35 is transmitted to the main shaft 20. At this time, when the resistance of the main shaft 20 is small, the torque difference between the housing 22 and the inner housing 27 is small, and it cannot overcome the elastic force of the connecting shaft 28 to displace, thus making the entire impact unit 7 a transmission unit, which transmits the driving force received from the drive unit 5 to the multi-functional... When the spindle 20 experiences significant resistance, the torque difference between the sleeve 22 and the inner shell 27 becomes larger, causing the connecting shaft 28 to deform. This, combined with the relationship between the spiral groove 26 and the ball bearing 25, causes the sleeve 22 to move axially. This disengages the impact pawl 1 23 and impact pawl 24, allowing the inner shell 27 to rotate. The impact pawl 1 23 and impact pawl 24 rotate to the next engagement position and then engage again. If the spindle 20 still cannot rotate at this point, the impact pawl 1 23 and impact pawl 24 will rotate relative to each other again. During each disengagement and engagement of the impact pawl 1 23 and impact pawl 24, circumferential and axial impacts occur between them, transmitting the impacts to the multi-functional chuck 8.

[0039] This device, by setting an impact part 7, can use the axial movement of the inner shell 27 to make the impact pawl 1 23 and impact pawl 24 repeatedly engage and disengage when the multi-functional chuck 8 is subjected to large rotational resistance. In this way, the axial and circumferential impacts of the impact pawls during the disengagement process are used to apply vibration to the multi-functional chuck 8, and then the vibration is used to loosen it.

[0040] In addition, this device, by setting up a transmission unit 6, which is based on the design of a "star gear set", on the one hand, utilizes its double open degree of freedom design to prevent the drive unit 5 from jamming regardless of whether the main shaft 20 can rotate, thereby preventing the drive unit 5 from burning out. On the other hand, its double degree of freedom design also allows the impact unit 7 to automatically start and stop depending entirely on the resistance of the main shaft 20. At the same time, since the torque transmission is continuous during the impact process, that is, the main shaft 20 is continuously subjected to torque, and the impact pawl 1 23 and impact pawl 24 are subjected to torque impact when they cooperate, it can be ensured that when the main shaft 20 is jammed due to high resistance, it receives a large impact force, which can ensure instantaneous twisting at the moment of loosening, thus increasing reliability.

[0041] Example 3:

[0042] To solve driver issues, such as Figure 6 , Figure 7 As shown, this embodiment makes the following improvements based on the above embodiments: The drive unit 5 includes a rotor 31 and a stator 33 that cooperate with each other. The stator 33 is fixed to the inner wall of the outer casing 1, and the power input terminal of the stator 33 is connected to the removable lithium battery 4 through the controller 2. The inner wall of the rotor 31 is fixed with a rotor shaft 32, which is rotatably connected to the inner wall of the outer casing 1. The outer wall of the rotor shaft 32 is connected to the outer gear ring 30 through a connecting claw 34.

[0043] When the controller 2 is turned on, it transfers the electrical energy of the removable lithium battery 4 to the stator 33, thereby driving the rotor 31 to rotate by electromagnetic induction, which in turn drives the outer gear ring 30 to rotate through the rotor shaft 32 and the connecting claw 34.

[0044] A cooling fan 36 is fixed to the outer wall of the rotor shaft 32, and a grille 37 is provided at the rear end of the outer casing 1.

[0045] When the rotor shaft 32 rotates, it drives the cooling fan 36 to rotate, thereby using the cooling fan 36 to guide the air in the outer casing 1 through the grille 37 to achieve the heat dissipation effect.

[0046] In this embodiment, by setting components such as rotor 31, stator 33, and cooling fan 36, the air inside the outer casing 1 can be discharged through grille 37 by the air guided by the cooling fan 36 during the operation of the entire lithium battery wrench, thereby achieving a heat dissipation effect and ensuring the reliability of the lithium battery wrench.

[0047] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A lithium-ion battery wrench, comprising a housing (1), characterized in that, A handle (3) is provided on the bottom side of the outer shell (1), and a removable lithium battery (4) is provided at the bottom of the handle (3). Inside the outer shell (1) is a drive unit (5) and an impact unit (7) that is connected to the output end of the drive unit (5) via a transmission unit (6). On the outside of the outer shell (1) is a multi-functional chuck (8) for connecting a concave wrench (15) or a convex wrench (17), and the multi-functional chuck (8) is connected to the power output end of the impact unit (7). A controller (2) is provided on one side of the handle (3), and the removable lithium battery (4) is electrically connected to the power input end of the drive unit (5) via the controller (2). The multi-functional chuck (8) includes a sleeve (9) fixed to the power output end of the impact part (7), an outer cylinder (11) axially slidably connected to the outer wall of the sleeve (9), and a plurality of clamping pieces (14) fixed to the end of the sleeve (9). The outer contour of the outer cylinder (11) matches the inner contour of the recessed part of the concave wrench (15), the inner contour of the multiple clamps (14) matches the outer contour of the protrusion of the convex wrench (17), and the inner wall of the opening of the outer cylinder (11) matches the outer wall of the clamps (14) through the inclined surface (12).

2. A lithium-ion battery wrench according to claim 1, characterized in that, The outer wall of the outer cylinder (11) is provided with an elastic protrusion one (13), which matches the groove one (16) provided at the recess of the inner wrench (15). The inner wall of the clamp (14) is provided with an elastic protrusion two (19), which matches the groove two (18) at the protrusion of the outer wrench (17).

3. A lithium-ion battery wrench according to claim 1, characterized in that, One end of the outer cylinder (11) is fastened with a spring (10), and the other end of the spring (10) is fastened to the outer wall of the sleeve shaft (9).

4. A lithium-ion battery wrench according to claim 1, characterized in that, The impact part (7) includes a shell (22) and an inner shell (27). A main shaft (20) is coaxially fixed on the inner side of the inner shell (27). One end of the main shaft (20) is fixedly connected to the sleeve shaft (9). The main shaft (20) is rotatably connected to the inner wall of the outer shell (1). An impact pawl (23) is fixed on the outer wall of the main shaft (20). The shell (22) is located on the outer wall of the inner shell (27). Multiple spiral grooves (26) are opened on the outer side wall of the inner shell (27). The inner wall of the shell (22) and the inner wall of the spiral grooves (26) are fitted with balls (25).

5. A lithium-ion battery wrench according to claim 4, characterized in that, One end of the inner wall of the casing (22) is rotatably connected to a transition ring (21), and the end face of the transition ring (21) is connected to the end face of the inner shell (27) by a connecting shaft (28).

6. A lithium-ion battery wrench according to claim 4, characterized in that, The transmission unit (6) includes an external gear ring (30), a sun gear (35) and a plurality of planet gears (29). The external gear ring (30) is rotatably connected to the inner wall of the outer casing (1) through a bearing. The plurality of planet gears (29) are meshed in an array with the inner wall of the external gear ring (30), and the sun gear (35) is meshed with the inner wall of the plurality of planet gears (29).

7. A lithium-ion battery wrench according to claim 6, characterized in that, One side of the external gear ring (30) is connected to the output end of the drive unit (5) via a connecting claw (34). The sun gear (35) is fixedly connected to one end of the main shaft (20), and multiple planet gears (29) are respectively rotated and axially slidably connected to one side of the housing (22) via a connecting shaft (28).

8. A lithium-ion battery wrench according to claim 1, characterized in that, The drive unit (5) includes a rotor (31) and a stator (33) that cooperate with each other. The stator (33) is fixed to the inner wall of the outer casing (1). The inner wall of the rotor (31) is fixed with a rotor shaft (32). The rotor shaft (32) is rotatably connected to the inner wall of the outer casing (1), and the outer wall of the rotor shaft (32) is connected to the outer gear ring (30) through a connecting claw (34).

9. A lithium-ion battery wrench according to claim 8, characterized in that, The power input terminal of the stator (33) is connected to the removable lithium battery (4) via the controller (2).

10. A lithium-ion battery wrench according to claim 8, characterized in that, The outer wall of the rotor shaft (32) is fixed with a cooling fan (36), and the rear end of the outer casing (1) is provided with a grille (37).

Images