A torque wrench

Abstract

The application discloses a torque wrench, comprising: a manual torque trigger device; an electric rotating device, the electric rotating device comprising: a wrenching body connected with an output end of the manual torque trigger device, the wrenching body being provided with a wrenching rotating hole; a ratchet wheel rotatably arranged in the wrenching rotating hole, the ratchet wheel being provided with ratchet teeth on an outer periphery thereof; a first pawl assembly arranged between the wrenching body and the ratchet wheel and used for limiting the ratchet wheel to rotate in one direction; and an electric driving device arranged on the wrenching body and used for driving the ratchet wheel to rotate. The torque wrench can complete most of a long and small-torque screwing stroke in an electric mode, thereby improving work efficiency, and finally, the screwing is tightened manually, and the manual tightening can provide a required torque.

Description

Technical Field

[0001] This invention belongs to the field of wrench technology, specifically relating to a torque wrench. Background Technology

[0002] A wrench is a commonly used tool for installation and disassembly. It is a hand tool that uses leverage to tighten or loosen bolts, screws, nuts, and other threaded fasteners that hold bolts or nuts in open or recessed holes.

[0003] Currently, when applying torque using a torque wrench, the desired torque value is usually set first. When the operator turns the wrench to the desired torque value, the mechanical release mechanism inside the torque wrench produces a knocking sound and a slight vibration to prompt the operator to stop applying force.

[0004] However, the torque wrench mentioned above needs to be swung back and forth continuously when tightening bolts, which is relatively inefficient. Summary of the Invention

[0005] The purpose of this invention is to provide a torque wrench that makes tightening screws more efficient.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a torque wrench, comprising:

[0007] Manual torque triggering device;

[0008] An electrically driven rotating device, the electrically driven rotating device comprising:

[0009] A lever body is connected to the output end of the manual torque triggering device, and the lever body is provided with a lever rotation hole;

[0010] A ratchet is rotatably disposed within the actuating hole, and ratchet teeth are provided on the outer periphery of the ratchet;

[0011] A first pawl assembly is disposed between the lever body and the ratchet, and is used to restrict the ratchet to rotate only in one direction;

[0012] An electric drive unit is mounted on the lever body and is used to drive the ratchet to rotate.

[0013] Furthermore, the electric drive device includes:

[0014] Drive motor;

[0015] A transmission mechanism, connecting the output shaft of the drive motor to the ratchet, is used to transmit power to the ratchet. The transmission mechanism includes:

[0016] A rotating gear is provided in the inner wall of the actuating rotating hole, the rotating gear is installed in the driving rotating groove, the rotating gear is sleeved on the outside of the ratchet, and the rotating gear is provided with driven connecting teeth.

[0017] A connecting sleeve is fixed between the manual torque triggering device and the lever body. The connecting sleeve has a connecting groove, and the lever body has a lever through hole. The lever through hole connects the lever rotating hole to the connecting groove, and the drive motor is fixed in the connecting groove.

[0018] A drive shaft passes through the lever hole. One end of the drive shaft is connected to the shaft of the drive motor, and the other end is provided with an active connecting tooth that meshes with the driven connecting tooth.

[0019] The second pawl assembly has a second mounting groove on the rotating gear, and the second pawl assembly is installed in the second mounting groove. When the rotating gear drives the ratchet to rotate through the second pawl assembly, the first pawl assembly does not restrict the rotation of the ratchet.

[0020] A control device for controlling the rotation of the drive motor shaft.

[0021] Furthermore, the first pawl assembly includes a first pawl and a first elastic element. The lever body is provided with a first mounting groove, which includes a small end and a large end. The width of the small end of the first mounting groove is smaller than the width of the large end. The first pawl includes a small end and a large end. The small end of the first pawl is inserted into the small end of the first mounting groove. The first elastic element has a tendency to drive the large end of the first pawl to move towards the small end of the first mounting groove. The first pawl is provided with a first pawl tooth that meshes with the ratchet tooth.

[0022] Furthermore, the first elastic element is configured as a first torsion spring, the first torsion spring including a first groove insertion end and a first claw insertion end, the bottom of the first mounting groove is provided with a first groove insertion hole, the large end of the first pawl of the first pawl is provided with a first claw insertion groove, the first groove insertion end is inserted into the first groove insertion hole, the first claw insertion end is inserted into the first claw insertion groove, and the first elastic element has a tendency to drive the large end of the first pawl to move towards the small end of the first mounting groove.

[0023] Furthermore, the second pawl assembly includes a second pawl and a second elastic member, the second mounting groove includes a small end and a large end, the width of the small end of the second mounting groove is smaller than the width of the large end of the second mounting groove, the second pawl includes a small end and a large end, the small end of the second pawl is inserted into the small end of the second mounting groove, the second elastic member has a tendency to drive the large end of the second pawl to move towards the small end of the second mounting groove, and the second pawl is provided with a second pawl tooth that meshes with the ratchet tooth.

[0024] Furthermore, the second elastic element is configured as a second torsion spring, which includes a second groove insertion end and a second claw insertion end. The bottom of the second mounting groove is provided with a second groove insertion hole, and the large end of the second pawl of the second pawl is provided with a second claw insertion groove. The second groove insertion end is inserted into the second groove insertion hole, and the second claw insertion end is inserted into the second claw insertion groove. The second elastic element has a tendency to drive the large end of the second pawl to move towards the small end of the second mounting groove.

[0025] Furthermore, it also includes a planetary gear reducer, which includes a reduction input end and a reduction output end. The planetary gear reducer is fixedly connected to the drive motor, the reduction input end is fixedly connected to the drive motor shaft, and the reduction output end is fixedly connected to the drive shaft.

[0026] Furthermore, the manual torque triggering device includes:

[0027] A handle tube, wherein an axially extending handle through hole is provided inside the handle tube;

[0028] The top pin is slidably disposed within the handle through hole;

[0029] A torsion shaft, wherein the first connecting end of the torsion shaft extends into the handle through hole and is rotatably connected to the handle tube;

[0030] A torque adjustment mechanism is used to apply a preload force toward the torque shaft to the top pin seat;

[0031] A torque triggering assembly is disposed between the torque shaft and the top pin seat;

[0032] The lever body is fixedly connected to the second connecting end of the torque shaft.

[0033] Furthermore, the control device includes a battery and a circuit board, the battery and the circuit board being fixed in the connection slot, and the drive motor being electrically connected to the battery and the circuit board.

[0034] Furthermore, the manual torque triggering device includes:

[0035] Torque tube, wherein a torque connection hole is provided inside the torque tube;

[0036] A torque-fixed shaft is provided, with one end inserted into the torque connection hole and fixedly connected to the torque tube, and the other end fixedly connected to the lever body. Two mounting grooves are provided opposite to each other on the torque-fixed shaft, and strain gauges are fixed in both mounting grooves.

[0037] A circuit board assembly, which is electrically connected to the strain gauge.

[0038] Compared with the prior art, the beneficial effects of the present invention are:

[0039] (1) The electric mode of this torque wrench completes most of the long and low-torque tightening stroke, improving work efficiency. Finally, manual tightening can provide the required torque.

[0040] (2) The electric drive unit only needs to provide a small torque, so the size of the electric drive unit can be made smaller;

[0041] (3) The entire device cleverly utilizes the first pawl assembly and the second pawl assembly to achieve automatic switching between electric and manual power modes without interference. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of the structure of an embodiment of the torque wrench of the present invention;

[0043] Figure 2 for Figure 1 Top view;

[0044] Figure 3 for Figure 2 Cross-sectional view at point AA;

[0045] Figure 4 for Figure 3 A magnified view of a section at point I;

[0046] Figure 5 This is an exploded view of the torque output mechanism;

[0047] Figure 6 This is a schematic diagram of the connection structure between the second pawl assembly and the ratchet.

[0048] Figure 7 A schematic diagram of the connection structure between the first pawl assembly and the ratchet.

[0049] Figure 8 for Figure 3 Enlarged view of a section at point II;

[0050] Figure 9 for Figure 3A magnified view of a section at point III;

[0051] Figure 10 for Figure 3 A magnified view of a section at point IV in the middle;

[0052] Figure 11 This is an exploded view of the electric drive unit;

[0053] Figure 12 This is a schematic diagram of the torsion shaft.

[0054] Figure 13 This is a structural diagram of the top pin seat and the connecting block;

[0055] Figure 14 This is a schematic diagram of another embodiment of the torque wrench of the present invention;

[0056] Figure 15 for Figure 14 A sectional view;

[0057] Figure 16 This is a diagram showing the installation location of the strain gauges.

[0058] In the diagram: 1. Handle tube; 2. Handle through hole; 3. Top pin seat; 4. Torque shaft; 5. First connecting end; 6. Actuating body; 7. Second connecting end; 8. Actuating rotating hole; 9. Ratchet; 10. Ratchet tooth; 11. First groove; 12. Second groove; 13. Connecting block; 14. Drive motor; 15. Rotating gear; 16. Drive rotating groove; 17. Driven connecting tooth; 18. Connecting sleeve; 19. Connecting groove; 20. Actuating through hole; 21. Drive rotating shaft 22. Active connecting tooth; 23. Second mounting slot; 24. First pawl; 25. First mounting slot; 26. Small end of first mounting slot; 27. Large end of first mounting slot; 28. Small end of first pawl; 29. ​​Large end of first pawl; 30. First torsion spring; 31. Insertion end of first slot; 32. Insertion end of first pawl; 33. Insertion hole of first slot; 34. First pawl insertion slot; 35. Second pawl; 36. Small end of second mounting slot; 37. Large end of second mounting slot 38. Small end of the second pawl; 39. Large end of the second pawl; 40. Second torsion spring; 41. Second slot insertion end; 42. Second pawl insertion end; 43. Second slot insertion hole; 44. Second pawl insertion slot; 45. Planetary gear reducer; 46. Compression spring; 47. Circuit board; 48. Compression seat; 49. Outer sleeve; 50. Fixing ring; 51. Adjusting screw; 52. Adjusting ring; 53. Battery; 54. First connecting slot; 55. First connecting ring 56. First connecting outer ring groove; 57. First connecting inner ring groove; 58. First retaining ring; 59. Second retaining ring; 60. Second outer ring groove; 61. Second inner ring groove; 62. Second connecting ring; 63. Manual torque triggering device; 64. Electric rotating device; 65. Torque tube; 66. Torque connecting hole; 67. Torque fixing shaft; 68. Mounting groove; 69. Strain gauge; 70. Circuit board assembly; 71. First arc-shaped surface; 72. Second arc-shaped surface. Detailed Implementation

[0059] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0060] Please see Figures 1-16 This invention provides a torque wrench technical solution.

[0061] A torque wrench, comprising:

[0062] Manual torque triggering device 63;

[0063] The electric rotating device 64 includes:

[0064] The lever body 6 is connected to the output end of the manual torque triggering device 63, and the lever body 6 is provided with a lever rotating hole 8.

[0065] Ratchet 9 is rotatably disposed in a lever hole 8, and ratchet teeth 10 are provided on the outer periphery of ratchet 9;

[0066] The first pawl assembly is located between the lever body 6 and the ratchet 9, and is used to restrict the ratchet 9 to rotate only in one direction.

[0067] An electric drive unit is mounted on the lever body 6 to drive the ratchet 9 to rotate.

[0068] This torque wrench combines the efficiency of power tools with the torque requirements of manual torque wrenches. Its usage mainly involves the following steps:

[0069] Step 1: Preparation

[0070] Setting the torque value: Adjust the torque adjustment mechanism of the manual torque triggering device 63 to compress or release the internal top pin 3, thereby setting the desired preset torque value.

[0071] Step 2: Electric Pre-tensioning Stage

[0072] Positioning: Fit the inner groove of ratchet 9 onto the bolt / nut.

[0073] Start the electric drive: The electric drive unit starts, driving ratchet 9 to rotate, thereby beginning the tightening of the bolt / nut. Note: At this stage, the first pawl assembly is in a "slipping" state (i.e., allowing ratchet 9 to rotate in the tightening direction), which does not interfere with the electric drive.

[0074] Preload to near torque value: Stop electric drive.

[0075] Step 3: Manual Precision Tightening and Final Torque Control Stage

[0076] Switch to manual mode: After stopping the electric drive, the operator needs to manually swing lever 6 to complete the final, precise torque application.

[0077] Manual force application: Apply force to the manual torque triggering device 63. This force will eventually push the lever body 6 to rotate. The lever body 6 tightens the bolt through the first pawl assembly and the ratchet 9.

[0078] Torque triggering and warning: Continue to apply force. When the torque applied to the bolt reaches the torque value preset in the first step, the manual torque triggering device 63 issues a warning signal, indicating that the preset torque has been reached and the force should be stopped immediately. At this time, the bolt has been precisely tightened to the preset torque.

[0079] The electric mode of this torque wrench handles most of the lengthy tightening strokes that require relatively low torque, significantly reducing the operator's workload and improving work efficiency. Finally, manual tightening is used, where manual operation can provide a larger and more suitable torque, while the electric drive only needs to provide a smaller torque, allowing for a more compact electric drive unit.

[0080] The manual torque triggering device 63 can be an existing torque wrench component. When the torque applied to the bolt by the manual torque triggering device 63 reaches the preset torque value, the manual torque triggering device 63 issues a warning signal to prompt the user to stop rotating. This warning signal can be a sound caused by the collision of components, or a vibration signal or prompt sound generated by electricity.

[0081] Furthermore, the electric drive unit includes:

[0082] Drive motor 14;

[0083] A transmission mechanism, connecting the output shaft of the drive motor 14 to the ratchet 9, is used to transmit power to the ratchet 9. The transmission mechanism includes:

[0084] Rotating gear 15 turns the inner wall of rotating hole 8, which is provided with drive rotating groove 16. Rotating gear 15 is installed in drive rotating groove 16. Rotating gear 15 is sleeved on the outside of ratchet 9. Rotating gear 15 is provided with driven connecting tooth 17.

[0085] A connecting sleeve 18 is fixed between a manual torque triggering device 63 and a lever body 6. A connecting groove 19 is provided inside the connecting sleeve 18. A lever body 6 is provided with a lever through hole 20. The lever through hole 20 connects the lever rotating hole 8 with the connecting groove 19. A drive motor 14 is fixed inside the connecting groove 19.

[0086] A drive shaft 21 passes through a lever hole 20. One end of the drive shaft 21 is connected to the shaft of the drive motor 14, and the other end is provided with an active connecting tooth 22, which meshes with a driven connecting tooth 17.

[0087] The second pawl assembly has a second mounting groove 23 on the rotating gear 15. The second pawl assembly is installed in the second mounting groove 23. When the rotating gear 15 drives the ratchet 9 to rotate through the second pawl assembly, the first pawl assembly does not restrict the rotation of the ratchet 9.

[0088] A control device is used to control the rotation of the shaft of the drive motor 14.

[0089] The working principle of the above-mentioned electric drive device is as follows:

[0090] 1. Electric drive mode (tightening):

[0091] Start-up: The control device starts the drive motor 14.

[0092] Transmission: The motor drives the rotating gear 15 that meshes with the active connecting gear 22 at the end of the drive shaft 21.

[0093] Unidirectional drive: When the second pawl assembly inside the rotating gear 15 rotates, it engages with the ratchet teeth 10 of the ratchet 9, thereby dragging the ratchet 9 to rotate together and outputting torque. At this time, the first pawl assembly on the lever body 6 will slip on the ratchet teeth 10, which does not hinder electric operation.

[0094] 2. Electric stop / manual mode:

[0095] Stop drive: The motor stops.

[0096] Manual operation: At this time, manual oscillation can be performed, and the first pawl assembly will push the ratchet 9 to complete the final precise tightening. During manual operation, the second pawl assembly will slip on the ratchet teeth 10 without creating any obstruction.

[0097] The entire device ingeniously utilizes the first and second pawl assemblies to achieve automatic switching between electric and manual power modes without interference.

[0098] The following is one embodiment of the first pawl assembly, such as... Figure 7 As shown, the first pawl assembly includes a first pawl 24 and a first elastic element. The lever body 6 is provided with a first mounting groove 25, which includes a small end 26 and a large end 27. The width of the small end 26 is smaller than the width of the large end 27. The first pawl 24 includes a small end 28 and a large end 29. The small end 28 is inserted into the small end 26. The first elastic element tends to move the large end 29 toward the small end 26. The first pawl 24 is provided with a first pawl tooth that meshes with the ratchet tooth 10. There is a gap between the large end 27 and the large end 29. The side of the first pawl 24 facing away from the ratchet 9 is provided with a first arc-shaped surface 71. The inner wall of the first mounting groove 25 is provided with a corresponding arc-shaped inner wall.

[0099] like Figure 7 As shown, the first elastic element is a first torsion spring 30, which includes a first groove insertion end 31 and a first claw insertion end 32. The bottom of the first mounting groove 25 is provided with a first groove insertion hole 33. The first pawl 24 has a first claw insertion groove 34 at its large end 29. The first groove insertion end 31 is inserted into the first groove insertion hole 33, and the first claw insertion end 32 is inserted into the first claw insertion groove 34. The first elastic element has a tendency to drive the large end 29 of the first pawl to move towards the small end 26 of the first mounting groove.

[0100] The first pawl assembly allows the ratchet 9 to rotate freely in one direction, while locking it in the opposite direction. When the ratchet 9 rotates freely in one direction, the ratchet teeth 10 press against the first pawl teeth. This pressing force overcomes the force of the first torsion spring 30, forcing the large end 29 of the first pawl to move towards the large end 27 of the first mounting groove, allowing the ratchet teeth 10 to slide smoothly and produce a "click" sound. When the ratchet 9 needs to rotate in the opposite direction, the ratchet teeth 10 press against the first pawl teeth, and the small end 28 of the first pawl is locked within the small end 26 of the first mounting groove, thereby locking the ratchet 9.

[0101] Similarly, such as Figure 6 As shown, the second pawl assembly includes a second pawl 35 and a second elastic member. The second mounting groove 23 includes a small end 36 and a large end 37. The width of the small end 36 is smaller than the width of the large end 37. The second pawl 35 includes a small end 38 and a large end 39. The small end 38 is inserted into the small end 36. The second elastic member tends to move the large end 39 towards the small end 36. The second pawl 35 has a second pawl tooth that meshes with the ratchet tooth 10. The side of the second pawl 35 facing away from the ratchet 9 is provided with a second arc-shaped surface 72, and the inner wall of the second mounting groove 23 has a corresponding arc-shaped inner wall.

[0102] like Figure 6 As shown, the second elastic element is configured as a second torsion spring 40. The second torsion spring 40 includes a second groove insertion end 41 and a second claw insertion end 42. The bottom of the second mounting groove 23 is provided with a second groove insertion hole 43. The second pawl 35 has a second claw insertion groove 44 at its large end 39. The second groove insertion end 41 is inserted into the second groove insertion hole 43, and the second claw insertion end 42 is inserted into the second claw insertion groove 44. The second elastic element has a tendency to drive the large end 39 of the second pawl to move towards the small end 36 of the second mounting groove.

[0103] When tightening is required, the drive motor 14 drives the rotating gear 15 to rotate, and the second pawl teeth of the second pawl 35 drag the ratchet 9 to rotate together. When tightening with a manual oscillating wrench, the ratchet 9 is pushed to rotate by the first pawl 24. At this time, the teeth of the ratchet 9 push away the teeth of the second pawl 35, forcing the second pawl 35 to overcome the force of the second elastic element and move towards the large end 37 of the second mounting groove, without affecting the tightening of the bolt.

[0104] The torque wrench also includes a planetary gear reducer 45, which includes a reduction input end and a reduction output end. The planetary gear reducer 45 is fixedly connected to the drive motor 14, the reduction input end is fixedly connected to the shaft of the drive motor 14, and the reduction output end is fixedly connected to the drive shaft 21.

[0105] The drive motor 14 drives the drive shaft 21 to rotate via the planetary gear reducer 45, resulting in a larger output torque. The planetary gear reducer 45 is an existing reduction mechanism, and its specific structure will not be described in detail.

[0106] The following is one embodiment of the manual torque triggering device 63, including:

[0107] Handle tube 1, with an axially extending handle through hole 2 inside the handle tube 1;

[0108] The top pin seat 3 is slidably set inside the handle through hole 2;

[0109] Torque shaft 4, the first connecting end 5 of torque shaft 4 extends into handle through hole 2 and is rotatably connected to handle tube 1;

[0110] A torque adjustment mechanism is used to apply a preload force toward the torque shaft 4 to the top pin seat 3;

[0111] The torque triggering component is located between the torque shaft 4 and the top pin seat 3;

[0112] The lever body 6 is fixedly connected to the second connecting end 7 (output end) of the torque shaft 4.

[0113] Adjust the torque adjustment mechanism at the end of the handle tube 1 to compress or release the internal top pin seat 3, thereby setting the desired preset torque value. When the torque applied to the bolt reaches the preset torque value in the first step, the torque trigger component activates. A clear "click" sound indicates that the preset torque has been reached, and the application of force should be stopped immediately. At this point, the bolt has been precisely tightened to the preset torque.

[0114] Furthermore, such as Figure 9 , Figure 12 and Figure 13 As shown, the torque triggering component includes:

[0115] A first groove 11 is formed on the first connecting end 5 of the torsion shaft 4;

[0116] A second groove 12 is formed at one end of the top pin seat 3 near the torsion shaft 4;

[0117] The connecting block 13 is disposed between the first groove 11 and the second groove 12.

[0118] When the torsional force generated by the torque exceeds the preload applied to the top pin seat 3 by the torque adjustment mechanism, the top pin seat 3 can no longer hold the connecting block 13. Under this pressure, the connecting block 13 will slip momentarily and collide with the handle tube 1, making a sound. When the wrench is released, the applied force disappears, and the connecting block 13 returns to the space between the first groove 11 and the second groove 12.

[0119] The following is one implementation of the torque adjustment mechanism, such as... Figure 9 and Figure 10 As shown, the torque adjustment mechanism includes:

[0120] A compression spring 46 is installed in the handle through hole 2 and is located at the end of the top pin seat 3 facing away from the torsion shaft 4.

[0121] The clamping seat 48 is installed in the handle through hole 2, and the clamping seat 48 is located at the end of the clamping spring 46 that is opposite to the top pin seat 3.

[0122] The outer sleeve 49 is fitted onto the handle tube 1 and can rotate relative to the handle tube 1. A fixing ring 50 is fixed inside the outer sleeve 49.

[0123] Adjusting screw 51 is fixed to fixed ring 50. One end of adjusting screw 51 abuts against the end of pressure seat 48 that is away from pressure spring 46.

[0124] Adjusting ring 52 is fixed inside the handle through hole 2. The inner hole of adjusting ring 52 is provided with adjusting internal thread, which is threadedly connected to adjusting screw 51.

[0125] When adjustment is required, rotating the outer sleeve 49 can move the adjusting screw 51 relative to the compression spring 46, thereby adjusting the clamping force of the clamping seat 48 on the compression spring 46 to obtain the required torque.

[0126] The control device includes a battery 53 and a circuit board 47, which are fixed within the connecting slot 19. The drive motor 14 is electrically connected to the battery 53 and the circuit board 47. By using the battery 53, no external power supply is required, making it more convenient. Alternatively, the control switch connected to the circuit board 47 can be located on the connecting sleeve 18 or the outer sleeve 49, allowing for control of the rotation of the drive motor 14. If the control switch is located on the outer sleeve 49, wireless control of the drive motor 14 is preferred.

[0127] like Figure 4 and Figure 7 The lever body 6 has a first connecting groove 54 on one side. The first mounting groove 25 is set on the bottom surface of the first connecting groove 54. The first connecting ring 55 is installed in the first connecting groove 54. The inner wall of the first connecting ring 55 has a first connecting outer ring groove 56. One end of the ratchet 9 has a first connecting inner ring groove 57. The first retaining ring 58 is sleeved on the first connecting inner ring groove 57. The outer end of the first retaining ring 58 is inserted into the first connecting outer ring groove 56. The first connecting ring 55 can rotate relative to the first connecting groove 54.

[0128] like Figure 4 and Figure 6The second mounting groove 23 is located on the side of the lever body 6 facing away from the first mounting groove 25, and extends through this side. A second connecting ring 62 is installed within the second mounting groove 23, located outside the rotating gear 15. The inner wall of the second connecting ring 62 has a second outer ring groove 60. The end of the ratchet 9 furthest from the first connecting ring 55 has a second inner ring groove 61. A second retaining ring 59 is fitted onto the second inner ring groove 61, and the outer end of the second retaining ring 59 is inserted into the second outer ring groove 60. The second connecting ring 62 can rotate relative to the second mounting groove 23. The ratchet 9 rotates relative to the lever body 6 by setting the first connecting ring 55 and the second connecting ring 62.

[0129] The rotating gear 15 is configured as a face gear, and the driving connecting tooth 22 on the driving shaft 21 meshes with the driven connecting tooth 17 on the face gear. The axis of the driving shaft 21 is perpendicular to the axis of the rotating gear 15. Multiple first pawl assemblies can be provided, and these assemblies are evenly distributed around the axis of the ratchet 9. Similarly, multiple second pawl assemblies can be provided, and these assemblies are evenly distributed around the axis of the ratchet 9.

[0130] The following is another embodiment of the manual torque triggering device 63, which includes:

[0131] Torque tube 65, with torque connection hole 66 inside;

[0132] Torque fixing shaft 67, one end of which is inserted into torque connection hole 66 and fixedly connected to torque tube 65, and the other end is fixedly connected to the lever body 6. Two mounting grooves 68 are provided opposite to each other on the torque shaft 4, and strain gauges 69 are fixed in both mounting grooves 68.

[0133] Circuit board assembly 70 is electrically connected to strain gauge 69.

[0134] When manual tightening of bolts is required, hold the torque tube 65 and rotate the torque tube 65 to drive the lever 6 to rotate. The lever 6 drives the bolt to rotate through the ratchet 9. The strain gauge 69 deforms inside the torque tube 65. The amount of deformation is converted into a corresponding torque display, which is displayed on the display screen on the circuit board assembly 70. When the torque reaches the set torque, the circuit board assembly 70 issues a warning signal. This warning signal is not limited to vibration signals or horn sounds.

[0135] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A torque wrench, characterized in that, include: Manual torque triggering device; An electric rotating device includes: a lever body connected to the output end of the manual torque triggering device, the lever body having a lever hole; a ratchet rotatably disposed within the lever hole, the ratchet having ratchet teeth on its outer periphery; a first pawl assembly disposed between the lever body and the ratchet, for restricting the ratchet to rotate only in one direction; and an electric drive device disposed on the lever body for driving the ratchet to rotate. The electric drive device includes: a drive motor; a transmission mechanism connecting the output shaft of the drive motor and the ratchet for transmitting power to the ratchet, the transmission mechanism including: a rotating gear, the inner wall of the lever hole having a drive groove, the rotating gear being installed in the drive groove and sleeved on the outside of the ratchet, the rotating gear having a driven connecting tooth; a connecting sleeve, the connecting sleeve being fixed between the manual torque triggering device and the lever body, the connecting sleeve having a connecting groove, the lever body having a lever through hole, the lever through hole connecting the lever hole to... The connecting slot is connected, and the drive motor is fixed in the connecting slot; the drive shaft passes through the lever hole, one end of the drive shaft is connected to the shaft of the drive motor, and the other end is provided with an active connecting tooth, which meshes with the driven connecting tooth; the second pawl assembly is provided on the rotating gear, the second mounting slot is provided, and the second pawl assembly is installed in the second mounting slot. When the rotating gear drives the ratchet to rotate through the second pawl assembly, the first pawl assembly does not restrict the rotation of the ratchet; the control device is used to control the rotation of the shaft of the drive motor.

2. A torque wrench according to claim 1, characterized in that, The first pawl assembly includes a first pawl and a first elastic element. The lever body is provided with a first mounting groove, which includes a small end and a large end. The width of the small end of the first mounting groove is smaller than the width of the large end. The first pawl includes a small end and a large end. The small end of the first pawl is inserted into the small end of the first mounting groove. The first elastic element has a tendency to drive the large end of the first pawl to move towards the small end of the first mounting groove. The first pawl is provided with a first pawl tooth that meshes with the ratchet tooth.

3. A torque wrench according to claim 2, characterized in that, The first elastic element is configured as a first torsion spring, which includes a first slot insertion end and a first claw insertion end. The bottom of the first mounting groove is provided with a first slot insertion hole, and the large end of the first pawl of the first pawl is provided with a first claw insertion groove. The first slot insertion end is inserted into the first slot insertion hole, and the first claw insertion end is inserted into the first claw insertion groove. The first elastic element has a tendency to drive the large end of the first pawl to move towards the small end of the first mounting groove.

4. A torque wrench according to claim 1, characterized in that, The second pawl assembly includes a second pawl and a second elastic member. The second mounting groove includes a small end and a large end. The width of the small end of the second mounting groove is smaller than the width of the large end of the second mounting groove. The second pawl includes a small end and a large end. The small end of the second pawl is inserted into the small end of the second mounting groove. The second elastic member has a tendency to drive the large end of the second pawl to move towards the small end of the second mounting groove. The second pawl is provided with a second pawl tooth that meshes with the ratchet tooth.

5. A torque wrench according to claim 4, characterized in that, The second elastic element is configured as a second torsion spring, which includes a second slot insertion end and a second claw insertion end. The bottom of the second mounting slot is provided with a second slot insertion hole, and the large end of the second pawl of the second pawl is provided with a second claw insertion groove. The second slot insertion end is inserted into the second slot insertion hole, and the second claw insertion end is inserted into the second claw insertion groove. The second elastic element has a tendency to drive the large end of the second pawl to move towards the small end of the second mounting slot.

6. A torque wrench according to claim 1, characterized in that, It also includes a planetary gear reducer, which has a reduction input end and a reduction output end. The planetary gear reducer is fixedly connected to the drive motor. The reduction input end is fixedly connected to the drive motor shaft, and the reduction output end is fixedly connected to the drive shaft.

7. A torque wrench according to claim 1, characterized in that, The manual torque triggering device includes: a handle tube with an axially extending handle through hole; a top pin seat slidably disposed within the handle through hole; a torque shaft with a first connecting end extending into the handle through hole and rotatably connected to the handle tube; a torque adjustment mechanism for applying a preload force toward the torque shaft to the top pin seat; a torque triggering assembly disposed between the torque shaft and the top pin seat; and a lever body fixedly connected to the second connecting end of the torque shaft.

8. A torque wrench according to claim 1, characterized in that, The control device includes a battery and a circuit board, which are fixed in the connection slot, and the drive motor is electrically connected to the battery and the circuit board.

9. A torque wrench according to claim 1, characterized in that, The manual torque triggering device includes: a torque tube with a torque connection hole inside; a torque fixing shaft, one end of which is inserted into the torque connection hole and fixedly connected to the torque tube, and the other end is fixedly connected to the lever body; two mounting grooves are provided opposite to each other on the torque fixing shaft, and strain gauges are fixed in both mounting grooves; and a circuit board assembly electrically connected to the strain gauges.

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