A torque screwdriver without reverse torque

Abstract

The present application relates to the technical field of repair tools, and in particular to a torque screwdriver without reverse torque, which includes a handle, a tool shank, a force-bearing sliding core, and the force-bearing sliding core is fixedly connected to the tool shank; a force transmission frame, the force transmission frame is sleeved on the outer wall of the force-bearing sliding core, the force transmission frame can slide along the length direction of the force-bearing sliding core, and a plurality of mounting holes are formed on the side wall of the force transmission frame, and force transmission balls are installed in the mounting holes, and the force transmission frame drives the force-bearing sliding core to rotate; a release groove ring, a plurality of inner hole grooves are formed on the side wall of the release groove ring, the force transmission balls are located in the inner hole grooves, the force transmission balls drive the force transmission frame and the release groove ring to rotate synchronously, the release groove ring is fixedly connected to the handle, and after the torque of the screwdriver reaches the set value, the force transmission balls switch to adjacent inner hole grooves; a bearing ball, the outer wall of the force transmission ball is in contact with the outer wall of the bearing ball, and the bearing ball is located in the force transmission frame; an elastic member, which is used to make the force transmission frame return to its original position after sliding on the outer wall of the force-bearing sliding core. The present application has the effect of reducing the deviation of the torque when the screwdriver tightens the screw.

Description

Technical Field

[0001] This application relates to the technical field of repair tools, and in particular to a torque screwdriver without reverse torque. Background Art

[0002] In daily life, screwdrivers are used very frequently and are the most commonly used tools in people's lives, playing a role in tightening and removing screws.

[0003] Currently, a screwdriver includes a handle and a shank disposed at one end thereof within the handle, and a tip is disposed at the other end of the shank. When in use, a worker turns the screw through the tip to adjust the tightness of the screw.

[0004] When tightening a screw with the above-mentioned screwdriver, when the torque peak is reached, there will be a small reverse torque. In the case of a large torque peak, this reverse torque can be ignored. However, in a screwdriver with a small torque, due to the existence of the reverse torque, there will be a deviation in torque, and there is a problem of poor accuracy of the screwdriver, which needs to be improved. Summary of the Invention

[0005] In order to reduce the reverse torque generated when tightening a screw with a screwdriver, reduce the torque deviation when tightening a screw, and improve the accuracy of the screwdriver, this application provides a torque screwdriver without reverse torque.

[0006] A torque screwdriver without reverse torque provided by this application adopts the following technical solutions:

[0007] A torque screwdriver without reverse torque includes a handle and a shank disposed at one end within the inner cavity of the handle, and further includes

[0008] a force-receiving sliding core, the force-receiving sliding core is fixedly connected to the shank;

[0009] a force-transmitting frame, the force-transmitting frame is sleeved on the outer wall of the force-receiving sliding core, the force-transmitting frame can slide along the length direction of the force-receiving sliding core, a plurality of mounting holes are opened on the side wall of the force-transmitting frame, force-transmitting balls are installed in the mounting holes, and the force-transmitting frame drives the force-receiving sliding core to rotate;

[0010] a release groove ring, a plurality of inner hole grooves are opened on the side wall of the release groove ring, the force-transmitting balls are located in the inner hole grooves, the force-transmitting balls drive the force-transmitting frame and the release groove ring to rotate synchronously, the release groove ring is fixedly connected to the handle, and after the torque of the screwdriver is reached, the force-transmitting balls switch to the adjacent inner hole grooves;

[0011] a bearing ball, the outer wall of the force-transmitting ball is in contact with the outer wall of the bearing ball, and the bearing ball is located within the force-transmitting frame;

[0012] An elastic member for causing the force transmission frame to return after sliding on the outer wall of the force-bearing sliding core.

[0013] By adopting the above technical solution, the staff inserts the end of the tool shank into the end of the screw rod, turns the tool handle, drives the release groove ring to rotate, drives the force transmission frame to rotate under the limitation of the force transmission ball, and the force transmission frame drives the force-bearing sliding core to rotate, so as to achieve the effect of tightening the screw rod. When the screwdriver does not reach the specified torque, the tool shank transmits the torque to the screw rod as the tool handle rotates; when the screw rod reaches the specified torque, the force transmission ball climbs out of the inner hole groove under the action of the lateral component force and moves towards the center direction of the tool shank. Due to the action of the bearing ball, the elastic member is compressed towards the tip of the tool shank. During the process of continuing to turn the tool handle, the force transmission ball falls into the adjacent inner hole groove, and the screw rod has been tightened at the specified torque, and the elastic member returns to the pre-compressed state. The setting of the force transmission ball facilitates the staff to tighten the screw rod. When the screw rod is tightened to the specified torque, the force transmission ball rolls out of the inner hole groove where it is located, and the tool handle is continuously turned to tighten the screw rod, reducing the reverse torque generated when the screwdriver tightens the screw rod and reducing the deviation of the torque when tightening the screw rod, thereby improving the accuracy of the screwdriver.

[0014] Optionally, a U-shaped groove is formed on the outer wall of the force-bearing sliding core, a sliding core ball is rotatably arranged on the inner wall of the U-shaped groove, a kidney-shaped groove is formed on the inner wall of the force transmission frame, and the sliding core ball rolls in the kidney-shaped groove.

[0015] By adopting the above technical solution, during the process of turning the tool handle, the setting of the sliding core ball enables the force-bearing sliding core and the force transmission frame to rotate synchronously. When the set torque is reached and the tool handle is continuously turned, the force transmission ball disengages from the inner hole groove. At this time, under the support of the bearing ball, the force transmission frame slides along the length direction of the force-bearing sliding core. The setting of the sliding core ball reduces the friction between the force-bearing sliding core and the force transmission frame, making the sliding of the force transmission frame smoother.

[0016] Optionally, a limiting groove is formed on the inner wall of the tool handle, several positioning grooves are formed on the inner wall of the limiting groove, several positioning blocks are fixed on the outer wall of the release groove ring, the release groove ring is located in the limiting groove, the positioning blocks and the positioning grooves are arranged in one-to-one correspondence, and the release groove ring is located at one end of the force transmission frame away from the tip of the tool shank.

[0017] By adopting the above technical solution, the staff inserts the release groove ring into the handle opening, so that the release groove ring slides into the limit groove, and the corresponding positioning block is clamped into the positioning groove. The cooperation of the positioning block and the positioning groove limits the relative rotation of the release groove ring and the handle, so that the release groove ring is driven to rotate when the staff rotates the handle. The opening of the limit groove limits the sliding of the release groove ring along the length direction of the handle; the opening of the limit groove limits the release groove ring to the outer wall of one end of the force transmission frame away from the tip of the tool bar. When the staff rotates the handle to tighten the screw, the release groove ring drives the force transmission frame to rotate, thereby driving the tool bar to rotate. The release groove ring twists the end of the force transmission frame, and the distance between the force application position on the tool bar and the screw is relatively large, so as to reduce the resistance arm and be more labor-saving.

[0018] Optionally, an adjusting bolt is sleeved on the outer wall of the tool bar, a small scale nut is threadedly connected to the outer wall of the adjusting bolt, positioning rings are arranged on the side walls of the adjusting bolt and the small scale nut, one end of the elastic member away from the force transmission ball abuts against the side wall of the positioning ring, and a limiting component for restricting the rotation of the adjusting bolt and the small scale nut is arranged on the outer wall of the handle.

[0019] By adopting the above technical solution, when the staff needs to adjust the torque of the screwdriver, rotate the small scale nut. The small scale nut slides on the outer wall of the adjusting bolt, driving the positioning ring to move. Under the drive of the positioning ring, the compression degree of the elastic member changes, and the acting force on the side wall of the force transmission frame changes under the support of the elastic member, so that the torque at which the force transmission ball breaks away from the inner hole groove changes. After the torque of the screwdriver is completed, the limiting component restricts the rotation of the adjusting bolt and the small scale nut, so that the stability of the screwdriver is better when the staff rotates the screw.

[0020] Optionally, a clamping hole is penetrated through the side wall of the small scale nut. The limiting component includes a locking inner lining that can rotate on the outer wall of the small scale nut; a sliding groove is opened on the inner wall of the locking inner lining, a counterbore is opened on the inner wall of the locking inner lining, the sliding groove is communicated with the counterbore, and the depth of the counterbore is greater than the depth of the sliding groove. The limiting component further includes a locking ball located in the clamping hole; a limiting block is fixed on the outer wall of the locking inner lining, and the limiting component further includes a locking ring that can rotate on the outer wall of the locking inner lining. A locking groove is opened on the inner wall of the locking ring, and the limiting block is clamped in the locking groove.

[0021] By adopting the above technical solution, when it is necessary to adjust the torque of the screwdriver, the staff rotates the locking ring along the direction from the sliding groove to the counterbore. The locking ring drives the locking inner lining to rotate, and the locking ring drives the locking ball to slide into the counterbore, increasing the distance between the locking ball and the outer wall of the adjusting bolt. At this time, the staff can adjust the torque of the screwdriver by rotating the small scale nut; after completing the adjustment of the torque of the screwdriver and restricting the rotation of the small scale nut, rotate the locking ring along the direction from the counterbore to the sliding groove, and the locking ball slides from the counterbore to the sliding groove, so that the outer wall of the locking ball abuts against the outer wall of the adjusting bolt, achieving the effect of restricting the rotation of the small scale nut, thereby making the screwdriver more stable when tightening the screw rod.

[0022] Optionally, a thrust bearing is arranged at one end of the adjusting bolt facing the elastic member. The side wall of the positioning ring is fixedly connected to the outer wall of the thrust bearing, and the elastic member is fixedly connected to the outer wall of the thrust bearing.

[0023] By adopting the above technical solution, the adjusting bolt and the elastic member are separated by a thrust bearing, reducing the friction between the positioning ring and the elastic member during the process of adjusting the torque of the screwdriver, so that when adjusting the torque, the compression of the elastic member will be easier.

[0024] Optionally, a preliminary adjustment screw is threadedly connected to the inner wall of the tool handle, a tightening screw is threadedly connected to the inner wall of the tool handle, a force - adding square tenon is riveted to the inner wall of the tool handle, and the outer wall of the force - adding square tenon abuts against the outer wall of the tightening screw.

[0025] By adopting the above technical solution, during the process of assembling the screwdriver, the staff loads the parts inside the tool handle from the opening at one end of the tool handle close to the preliminary adjustment screw. Finally, after loading the release groove ring and the bearing ball, tighten the preliminary adjustment bolt inside the tool handle, and then tighten the tightening screw inside the tool handle. The setting of the preliminary adjustment screw limits the parts inside the tool handle, the setting of the tightening screw limits the preliminary adjustment screw, reducing the possibility of the preliminary adjustment screw loosening. The setting of the force - adding square tenon limits the tightening screw, making the assembled screwdriver more compact and reducing the possibility of loosening.

[0026] Optionally, a rear cover is threadedly connected to the opening of the tool handle. A guiding groove is formed on the outer wall of the force - adding square tenon, and a positioning pin is fixed on the outer wall of the rear cover. The end of the positioning pin slides into the guiding groove.

[0027] By adopting the above technical solution, the setting of the positioning pin fixes the rear cover on the force - adding square tenon. When tightening the tightening screw on the tool handle, the rear cover is synchronously fixed on the tool handle; and during the process of tightening the tightening screw, the positioning pin slides on the inner wall of the guiding groove, facilitating the staff to tighten the rear cover.

[0028] In summary, the present application includes at least one of the following beneficial technical effects:

[0029] 1. When tightening the screw, the staff inserts the end of the tool rod into the screw and rotates the tool handle. The tool handle drives the release groove ring to rotate, drives the force transmission frame to rotate, and the force transmission frame drives the force sliding core to rotate, drives the tool rod to rotate, thereby tightening the screw. When the screwdriver reaches the specified torque, the force transmission ball climbs out of the inner hole groove under the action of the lateral force component, continues to rotate the tool handle, and the force transmission ball falls into the adjacent inner hole groove. At this time, the screw has been tightened at the specified torque. The setting of the force transmission ball reduces the reverse torque generated by the staff in the process of tightening the screw, reduces the torque deviation when tightening the screw, and improves the accuracy of the screwdriver.

[0030] 2. The setting of the tightening screw limits the position of the initial adjustment screw to reduce the possibility of the initial adjustment screw loosening. When the staff tightens the tightening screw through the force square tenon, the rear cover is set at the opening of the tool handle under the limitation of the positioning pin. The setting of the force square tenon limits the tightening screw to reduce the possibility of the tightening screw loosening.

[0031] 3. The opening of the limit groove limits the sliding of the release groove ring in the tool handle, and under the restriction, the release groove ring is fixed to the end of the force transmission frame, which increases the power arm of the screwdriver, thereby making it easier for workers to tighten the screw with the same torque. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the overall structure of the screwdriver in the embodiment of the present application.

[0033] Figure 2 It is a cross-sectional view of the screwdriver in the embodiment of the present application.

[0034] Figure 3 yes Figure 2 Enlarged view of point A in the middle.

[0035] Figure 4 It is a cross-sectional view of the screwdriver in the embodiment of the present application, used to show the state of the locking ball when the small-scale nut is locked.

[0036] Figure 5 It is a schematic diagram of the structure of the locking ring in the embodiment of the present application, which is used to show the connection between the locking liner and the inner wall of the locking ring.

[0037] Reference signs: 1, tool shank; 2, tool bar; 3, force-receiving sliding core; 4, force-transmitting frame; 5, mounting hole; 6, force-transmitting ball; 7, release groove ring; 8, inner hole groove; 9, bearing ball; 10, elastic member; 11, U-shaped groove; 12, sliding core ball; 13, kidney-shaped groove; 14, limiting groove; 15, positioning groove; 16, positioning block; 17, adjusting bolt; 18, small scale nut; 19, positioning ring; 20, limiting assembly; 21, clamping hole; 22, locking lining; 23, sliding groove; 24, counterbore; 25, locking ball; 26, limiting block; 27, locking ring; 29, thrust bearing; 30, preliminary adjustment screw; 31, tightening screw; 32, force-applying square tenon; 33, rear cover; 34, guiding groove; 35, positioning pin; 36, connecting pin. Detailed implementation manners

[0038] The following further elaborates on this application Figures 1-5 in conjunction with the attached drawings.

[0039] The embodiment of this application discloses a torque screwdriver without reverse torque.

[0040] Referring to Figure 1 , a torque screwdriver without reverse torque includes a tool shank 1. The tool shank 1 is hollowly arranged, and both ends of the tool shank 1 communicate with the outside. The screwdriver further includes an adjusting bolt 17 coaxially fixed to the tool shank 1 and a tool bar 2 coaxially fixed to the inner wall of the adjusting bolt 17. The tool bit of the tool bar 2 is located outside the adjusting bolt 17. Before the staff tightens the screw rod, the end of the tool bar 2 is inserted into the tightening head of the screw rod in advance. By rotating the tool shank 1, the adjusting bolt 17 is driven to rotate, and the tool bar 2 is driven to rotate, thereby screwing the screw rod.

[0041] Referring to Figure 2 , a force-receiving sliding core 3 is coaxially penetrated through the outer wall of the tool bar 2. Connecting holes are penetrated through the outer walls of the tool bar 2 and the force-receiving sliding core 3. The connecting holes are opened along the diameter direction of the tool bar 2 and the force-receiving sliding core 3. A connecting pin 36 is penetrated through the connecting holes. Under the limitation of the connecting pin 36, the force-receiving sliding core 3 is fixed on the outer wall of the tool bar 2. The force-receiving sliding core 3 is located at the end of the tool bar 2 away from the tool bit, and the force-receiving sliding core 3 is located inside the tool shank 1. When the staff rotates the tool shank 1, the force-receiving sliding core 3 is driven to rotate, and the tool bar 2 is driven to rotate under the limitation of the connecting pin 36.

[0042] Referring to Figure 2 and Figure 3, a number of U-shaped grooves 11 are evenly spaced on the outer wall of the force-bearing sliding core 3. The U-shaped grooves 11 are arranged along the length direction of the force-bearing sliding core 3. In this application, three U-shaped grooves 11 are preferably provided. One end of the U-shaped groove 11 facing the cutter head of the tool bar 2 is communicated with the edge of the force-bearing sliding core 3; a force-transmitting frame 4 is sleeved on the outer wall of the force-bearing sliding core 3. The force-transmitting frame 4 is annular. A number of waist-shaped grooves 13 are provided on the inner wall of the force-transmitting frame 4. In this application, three waist-shaped grooves 13 are preferably provided. The three waist-shaped grooves 13 are evenly distributed on the inner wall of the force-transmitting frame 4. One end of the waist-shaped groove 13 facing the cutter head of the tool bar 2 is communicated with the outside. Rotate the force-transmitting frame 4 so that the waist-shaped grooves 13 and the U-shaped grooves 11 are arranged in one-to-one correspondence. The sliding core balls 12 are loaded from the openings of the waist-shaped grooves 13 and the U-shaped grooves 11. In this application, two sliding core balls 12 are preferably loaded in each waist-shaped groove 13. The distance between the bottom wall of the waist-shaped groove 13 and the bottom wall of the U-shaped groove 11 is equal to the diameter of the sliding core ball 12. Under the limitation of the sliding core ball 12, the force-transmitting frame 4 is coaxially fixed on the outer wall of the force-bearing sliding core 3.

[0043] Refer to Figure 2 and Figure 3 , a limiting hole is provided on the side wall of the force-transmitting frame 4. In this application, two limiting holes are preferably provided. The limiting holes and the connecting holes are arranged in correspondence. The end of the connecting pin 36 is inserted into the limiting hole. The connecting pin 36 has a clearance fit with the limiting hole. The connecting pin 36 limits the relative rotation of the force-transmitting frame 4 and the force-bearing sliding core 3, so that when the staff rotates the tool handle 1, the force-bearing sliding core 3 and the force-transmitting frame 4 are driven to rotate together; the arrangement of the sliding core balls 12 supports the inner wall of the force-transmitting frame 4, reduces the friction between the force-transmitting frame 4 and the outer wall of the force-bearing sliding core 3, and the sliding core balls 12 tend to roll in the waist-shaped grooves 13 and the U-shaped grooves 11 during the process of the tool handle 1 driving the force-transmitting frame 4 and the force-bearing sliding core 3 to rotate. Therefore, the torque generated during the process of the screwdriver tightening the screw is reduced, and the precision of the screwdriver is improved.

[0044] Refer to Figure 2 , a number of mounting holes 5 are evenly spaced on the outer wall of the force-transmitting frame 4. In this application, three mounting holes 5 are preferably provided. Three force-transmitting balls 6 are loaded in the three mounting holes 5; a release groove ring 7 is sleeved on the outer wall of the force-transmitting frame 4. A number of inner hole grooves 8 are evenly spaced on the inner wall of the release groove ring 7. The inner hole grooves 8 are arranged along the length direction of the release groove ring 7. The inner hole grooves 8 penetrate through the release groove ring 7. Six inner hole grooves 8 are preferably provided. The force-transmitting balls 6 are tangent to the bottom walls of the corresponding inner hole grooves 8; a bearing ball 9 abuts against the inner wall of one end of the force-transmitting frame 4 far from the cutter head of the tool bar 2. The outer wall of the force-transmitting ball 6 abuts against the outer wall of the bearing ball 9. During the process of rotating the release groove ring 7, the force-transmitting frame 4 is driven to rotate under the drive of the force-transmitting ball 6.

[0045] Refer to Figure 2, a limiting groove 14 is provided on the inner wall of the tool handle 1. The inner wall of the limiting groove 14 is coaxial with the tool handle 1. A plurality of positioning grooves 15 are evenly spaced on the inner wall of the limiting groove 14. In this application, three positioning grooves 15 are preferably provided, and the three positioning grooves 15 are all located at the edge positions of the inner wall of the limiting groove 14; a plurality of positioning blocks 16 are integrally fixed on the outer wall of the release groove ring 7 at equal intervals. The positioning blocks 16 are arranged in one-to-one correspondence with the positioning grooves 15; an initial adjustment screw 30 is threadedly connected to the inner wall of the tool handle 1. The outer wall of the initial adjustment screw 30 abuts against the side wall of the release groove ring 7. Under the limitation of the initial adjustment screw 30, the release groove ring 7 is fixed in the limiting groove 14, and the load-bearing ball 9 is restricted between the force transmission frame 4 and the initial adjustment screw 30, so that the load-bearing ball 9 is located between the opening edge of the force transmission frame 4 and the initial adjustment screw 30.

[0046] Refer to Figure 2 , a tightening screw 31 is threadedly connected to the inner wall of the tool handle 1. After the staff tightens the initial adjustment screw 30, the tightening screw 31 is installed into the inner cavity of the tool handle 1. The outer wall of the tightening screw 31 abuts against the outer wall of the initial adjustment screw 30. The setting of the tightening screw 31 limits the initial adjustment screw 30 and reduces the possibility of the initial adjustment screw 30 loosening. A plurality of clamping grooves are evenly spaced on the inner wall of the tool handle 1. In this application, three clamping grooves are preferably provided. A force-applying square tenon 32 is clamped and fixed on the inner wall of the tool handle 1. The side of the force-applying square tenon 32 facing the inner cavity of the tool handle 1 abuts against the outer wall of the tightening screw 31. Three clamping blocks are integrally fixed on the outer wall of the force-applying square tenon 32 at equal intervals. The staff clamps the clamping blocks into the corresponding clamping grooves by means of mortise and tenon, so as to fix the force-applying square tenon 32. The setting of the force-applying square tenon 32 limits the tightening screw 31 and reduces the possibility of the tightening screw 31 loosening.

[0047] Refer to Figure 2 , a guiding groove 34 is provided on the outer wall of the force-applying square tenon 32. The guiding groove 34 is provided along the circumferential direction of the force-applying square tenon 32, and the guiding groove 34 is coaxial with the force-applying square tenon 32; a rear cover 33 is provided at the opening of the tool handle 1. A plurality of positioning pins 35 are welded and fixed on the outer wall of the rear cover 33. In this application, two positioning pins 35 are preferably provided, and the two limiting pins are symmetrically arranged along the axis of the rear cover 33. The end of the limiting pin slides into the guiding groove 34. The rear cover 33 is threadedly connected to the inner wall of the tool handle 1. When the staff rotates the rear cover 33, the end of the positioning pin 35 slides in the guiding groove 34. The setting of the positioning pin 35 limits the rear cover 33 on the one hand and reduces the possibility of the rear cover 33 detaching from the tool handle 1, and reduces the interference caused by the rotation of the rear cover 33 on the other hand.

[0048] Refer to Figure 2, a small scale nut 18 is threadedly connected on the outer wall of the adjusting bolt 17, and the small scale nut 18 and the outer wall of the adjusting bolt 17 are both scaled. An elastic member 10 for adjusting the torque of the screwdriver is provided at the end of the adjusting bolt 17, and a spring is preferably used for the elastic member 10 in the present application. A thrust bearing 29 is coaxially mounted on the outer wall of the end of the adjusting bolt 17 facing the inner cavity of the handle 1, and a positioning ring 19 is coaxially sleeved on the outer wall of the adjusting bolt 17, and the positioning ring 19 is located on the side of the thrust bearing 29 away from the blade of the shank 2. One end of the elastic member 10 abuts against the side wall of the force transmission frame 4, and the other end abuts against the side of the positioning ring 19 away from the thrust bearing 29. The staff rotates the small scale nut 18 to compress the elastic member 10, and the abutment of the elastic member 10 makes the abutment between the force transmission ball 6 and the outer wall of the bearing ball 9 tighter, thereby completing the adjustment of the torque of the screwdriver.

[0049] Reference Figure 2 A limit assembly 20 for limiting the rotation of the small scale nut 18 is provided on the outer wall of the small scale nut 18. The outer wall of the small scale nut 18 is evenly spaced with a plurality of snap-in holes 21. In the present application, two snap-in holes 21 are preferably provided. The two snap-in holes 21 are symmetrically provided along the diameter of the small scale nut 18. The limit assembly 20 includes a locking liner 22 sleeved on the outer wall of the small scale nut 18. The locking liner 22 is composed of two semicircular rings connected by a connecting rod. Figure 4 A plurality of sliding grooves 23 are evenly spaced on the inner wall of the locking liner 22. The length direction of the sliding grooves 23 is arranged along the circumference of the locking liner 22. Preferably, two sliding grooves 23 are provided. A countersunk hole 24 is provided on the inner wall of the locking liner 22. The countersunk hole 24 and the sliding groove 23 are arranged in a one-to-one correspondence. The countersunk hole 24 is connected to the sliding groove 23. The depth of the countersunk hole 24 is greater than the depth of the sliding groove 23. The limiting assembly 20 also includes a locking ball 25 installed in the clamping hole 21. The locking ball 25 is located in the sliding groove 23. During the rotation of the locking liner 22, when the locking ball 25 is located in the sliding groove 23, the outer wall of the locking ball 25 abuts against the outer wall of the adjusting nut, thereby limiting the rotation of the small scale nut 18; when the locking ball 25 is located in the countersunk hole 24, the distance between the locking ball 25 and the adjusting bolt 17 is large, thereby facilitating the rotation of the small scale nut 18.

[0050] Reference Figure 5 , a plurality of limit blocks 26 are welded and fixed at even intervals on the outer wall of the locking liner 22. In the present application, four limit blocks 26 are preferably provided; a locking ring 27 is rotatably provided on the outer wall of the locking liner 22. A locking groove is provided on the inner wall of the locking ring 27. In the present application, four locking grooves are preferably provided. The limit blocks 26 are clamped and fixed in the locking grooves. When the staff rotates the locking ring 27, the locking liner 22 is driven to rotate. Figure 1, one end of the tool handle 1 close to the tool tip of the tool shank 2 is fixed to the outer wall of the adjusting bolt 17 by screws, making the fixation of the tool handle 1 and the adjusting bolt 17 more stable.

[0051] The implementation principle of a torque screwdriver without reverse torque in an embodiment of the present application is as follows: Before tightening the screw rod, first adjust the torque of the screwdriver according to requirements. Rotate the locking ring 27 to drive the locking inner liner 22 to rotate, so that the locking ball 25 slides into the counterbore 24. At this time, rotate the small scale nut 18 to adjust the compression degree of the elastic member 10, so that the abutting degree between the force transmission ball 6 and the outer wall of the bearing ball 9 changes, thereby realizing the adjustment of the torque of the screwdriver;

[0052] Rotate the locking ring 27 to drive the locking inner liner 22 to rotate, drive the locking ball 25 to roll into the sliding groove 23, and the abutting ball abuts against the outer wall of the adjusting bolt 17 to limit the rotation of the small scale bolt and reduce the possibility of self-rotation;

[0053] Rotate the tool handle 1, the tool handle 1 drives the release groove ring 7 to rotate, drives the force transmission frame 4 to rotate under the limit of the force transmission ball 6, and the force-receiving sliding core 3 rotates synchronously to drive the tool shank 2 to rotate, achieving the effect of tightening the screw rod. When the set torque is reached, the force transmission ball 6 climbs out of the inner hole groove 8 where it is located under the action of the lateral component force. Continue to rotate the tool handle 1, and the force transmission ball 6 slides into the adjacent inner hole groove 8. The screw rod has been tightened within the specified torque. The setting of the force transmission ball 6 reduces the reverse torque generated when the screwdriver tightens the screw rod, reduces the deviation of the torque when tightening the screw rod, and thus improves the accuracy of the screwdriver.

[0054] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A torque screwdriver without reverse torque, comprising a handle (1) and a shank (2) with one end disposed within the inner cavity of the handle (1), characterized in that: Further included is a force-bearing sliding core (3), which is fixedly connected to the tool shank (2); a force transmission frame (4), which is sleeved on the outer wall of the force-bearing sliding core (3), the force transmission frame (4) can slide along the length direction of the force-bearing sliding core (3), a plurality of mounting holes (5) are formed on the side wall of the force transmission frame (4), force transmission balls (6) are installed in the mounting holes (5), and the force transmission frame (4) drives the force-bearing sliding core (3) to rotate; a release groove ring (7), a plurality of inner hole grooves (8) are formed on the side wall of the release groove ring (7), the force transmission balls (6) are located in the inner hole grooves (8), the force transmission balls (6) drive the force transmission frame (4) to rotate synchronously with the release groove ring (7), the release groove ring (7) is fixedly connected to the tool handle (1), and after the torque of the screwdriver is reached, the force transmission balls (6) switch to the adjacent inner hole grooves (8); a bearing ball (9), the outer wall of the force transmission ball (6) is in contact with the outer wall of the bearing ball (9), and the bearing ball (9) is located in the force transmission frame (4); an elastic member (10) for returning the force transmission frame (4) after sliding on the outer wall of the force-bearing sliding core (3).

2. A torque screwdriver without reverse torque according to claim 1, characterized in that: A U-shaped groove (11) is formed on the outer wall of the force-bearing sliding core (3), a sliding core ball (12) is arranged to roll on the inner wall of the U-shaped groove (11), a waist-shaped groove (13) is formed on the inner wall of the force transmission frame (4), and the sliding core ball (12) rolls in the waist-shaped groove (13).

3. A torque screwdriver without reverse torque according to claim 1, characterized in that: A limiting groove (14) is formed on the inner wall of the tool handle (1), a plurality of positioning grooves (15) are formed on the inner wall of the limiting groove (14), a plurality of positioning blocks (16) are fixed on the outer wall of the release groove ring (7), the release groove ring (7) is located in the limiting groove (14), the positioning blocks (16) and the positioning grooves (15) are arranged in one-to-one correspondence, and the release groove ring (7) is located at one end of the force transmission frame (4) away from the tip of the tool shank (2).

4. The torsion screwdriver without reverse torque according to claim 3, characterized in that: An adjusting bolt (17) is sleeved on the outer wall of the tool shank (2), a small scale nut (18) is threadedly connected to the outer wall of the adjusting bolt (17), a positioning ring (19) is arranged on the side walls of the adjusting bolt (17) and the small scale nut (18), one end of the elastic member (10) away from the force transmission ball (6) abuts against the side wall of the positioning ring (19), and a limiting component (20) for restricting the rotation of the adjusting bolt (17) and the small scale nut (18) is arranged on the outer wall of the tool handle (1).

5. The torsion screwdriver without reverse torque according to claim 4, characterized in that: A clamping hole (21) is formed through the side wall of the small scale nut (18), and the limiting component (20) includes a locking lining (22) rotatably arranged on the outer wall of the small scale nut (18); a sliding groove (23) is formed in the inner wall of the locking lining (22), a counterbore (24) is formed in the inner wall of the locking lining (22), the sliding groove (23) is communicated with the counterbore (24), the depth of the counterbore (24) is greater than that of the sliding groove (23), and the limiting component (20) further includes a locking ball (25) located in the clamping hole (21); a limiting block (26) is fixed on the outer wall of the locking lining (22), and the limiting component (20) further includes a locking ring (27) rotatably arranged on the outer wall of the locking lining (22), a locking groove is formed in the inner wall of the locking ring (27), and the limiting block (26) is clamped in the locking groove.

6. A torque screwdriver without reverse torque according to claim 5, characterized in that: One end of the adjusting bolt (17) facing the elastic member (10) is provided with a thrust bearing (29), the side wall of the positioning ring (19) is fixedly connected to the outer wall of the thrust bearing (29), and the elastic member (10) is fixedly connected to the outer wall of the thrust bearing (29).

7. A torque screwdriver without reverse torque according to claim 1, characterized in that: A preliminary adjustment screw (30) is threadedly connected to the inner wall of the tool handle (1), a clamping screw (31) is threadedly connected to the inner wall of the tool handle (1), a force - adding square tenon (32) is riveted to the inner wall of the tool handle (1), and the outer wall of the force - adding square tenon (32) abuts against the outer wall of the clamping screw (31).

8. A torque screwdriver without reverse torque according to claim 7, characterized in that: A rear cover (33) is threadedly connected to the opening of the tool handle (1), a guiding groove (34) is formed in the outer wall of the force - adding square tenon (32), a positioning pin (35) is fixed on the outer wall of the rear cover (33), and the end of the positioning pin (35) slides into the guiding groove (34).

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