Electronic force limiting torque wrench
By adding a 360-degree rotating force-reducing gear set to the rear end of the release mechanism of the electronic torque limiter, the problems of limited lever movement range and insufficient force reduction ratio are solved, achieving the effects of extended service life and reduced cost.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- WUHU XIEHANG MEASUREMENT & CONTROL TECH CO LTD
- Filing Date
- 2025-05-20
- Publication Date
- 2026-05-01
AI Technical Summary
Existing electronic torque limiters suffer from limited lever movement range and insufficient force reduction ratio, resulting in high stress at the final lever contact point, which affects service life and reliability. They are also complex in structure and expensive.
By adding one or more sets of 360-degree rotating damping gears to the rear end of the tripping mechanism, the movement range of the front lever is expanded, the damping ratio is increased, the torque required for the final locking is reduced, and the contact stress is reduced.
By increasing the lever's range of motion and improving the force reduction ratio, contact stress is reduced, service life is extended, wear is reduced, the structure is simplified, and costs are lowered.
Smart Images
Figure CN224182954U_ABST
Abstract
Description
An electronic torque limiting wrench Technical Field
[0001] This utility model belongs to the field of wrench technology, specifically, it relates to an electronic torque limiting wrench. Background Technology
[0002] The structure of an existing electronic torque limiter with a lever structure is shown in Figure 7. Because the contact point between the levers is fixed, the internal space of the handle restricts the range of motion of the levers. The number of lever transmission stages and the reduction ratio are limited, resulting in a large stress at the contact point of the last lever. This causes the contact point of the unloading mechanism lever to wear easily, affecting the service life of the product.
[0003] Another type of electronic torque limiter has a structure as shown in Figure 8. Because it uses a reduction gear set and input rack structure, the strength of the input stage tooth structure is limited, which affects the product's service life and reliability. In addition, the structure is complex and the manufacturing cost is high.
[0004] Chinese Patent Application No. 202111650913.4 discloses a mechanical digital display torque wrench, characterized by comprising an elastic shaft assembly, a sleeve, and a guide sleeve. The elastic shaft assembly includes an elastic shaft and a strain gauge. The front end of the elastic shaft is rigidly connected to the wrench head, and the rear end of the elastic shaft is inserted into the front cavity of the sleeve and hinged thereto by a pin. The guide sleeve is inserted into the sleeve and forms a clearance fit with the inner wall of the sleeve. A release mechanism is installed in the guide sleeve. When the applied torque of the wrench reaches a set value, the release mechanism can cause the wrench to slip and simultaneously strike the sleeve to produce a sound. Electronic components for torque setting, display, audible and visual alarm, and control of the release mechanism are installed on the outer wall of the sleeve.
[0005] An improved electronic torque limiter is provided, particularly regarding how to increase its service life. Summary of the Invention
[0006] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention provides an electronic torque-limiting wrench, with the purpose of improving its service life.
[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows: an electronic torque limiting wrench, comprising an input lever, a force application handle, a handle portion, a lever reducing mechanism, a stop pawl, a force reduction gear set, and an input rack. The force reduction gear set is composed of gears. The lever reducing mechanism is disposed between the input lever and the input rack and is used to transmit torque between the input lever and the input rack. The input lever is connected to the force application handle. The force reduction gear set is disposed between the stop pawl and the input rack. The input rack has an arc-shaped rack that meshes with the input end of the force reduction gear set. The stop pawl is used to lock the output end of the force reduction gear set. The input lever is rotatably connected to the handle portion via a first rotating shaft, the input rack is rotatably connected to the handle portion via a second rotating shaft, and the stop pawl is rotatably connected to the handle portion via a third rotating shaft.
[0008] The lever reducing mechanism includes a reducing lever, and at least one reducing lever is provided. The reducing lever is rotatably connected to the handle through a fourth rotating shaft.
[0009] The unloading and reducing gear set includes multiple gear sets, each gear set consisting of two coaxially arranged gears. The gears of adjacent gear sets mesh to form a single-stage gear transmission mechanism.
[0010] The unloading and reducing gear set includes a unidirectional reducing gear set and a fixed reducing gear set. At least one unidirectional reducing gear set is provided. The unidirectional reducing gear set is used to transmit torque unidirectionally between the arc-shaped rack and the fixed reducing gear set, or to transmit torque unidirectionally between the fixed reducing gear set and the stop pawl, or to transmit torque unidirectionally between the input rack and the stop pawl, or to transmit torque unidirectionally between two adjacent fixed reducing gear sets.
[0011] This utility model also provides an electronic torque limiting wrench, including an input lever, a force application handle, a handle portion, a stop pawl, a force reduction gear set, and an input rack. The force reduction gear set is composed of gears. The input lever is connected to the force application handle. The force reduction gear set is disposed between the stop pawl and the input rack. The input rack has an arc-shaped rack that meshes with the input end of the force reduction gear set. The stop pawl is used to lock the output end of the force reduction gear set. The input lever is rotatably connected to the handle portion via a first rotating shaft, the input rack is rotatably connected to the handle portion via a second rotating shaft, and the stop pawl is rotatably connected to the handle portion via a third rotating shaft.
[0012] The stop pawl is connected to an electric unloading mechanism, which controls the rotation of the stop pawl.
[0013] The unloading and reducing gear set includes multiple gear sets, each gear set consisting of two coaxially arranged gears. The gears of adjacent gear sets mesh to form a single-stage gear transmission mechanism.
[0014] The unloading and reducing gear set includes a unidirectional reducing gear set and a fixed reducing gear set. At least one unidirectional reducing gear set is provided. The unidirectional reducing gear set is used to transmit torque unidirectionally between the arc-shaped rack and the fixed reducing gear set, or to transmit torque unidirectionally between the fixed reducing gear set and the stop pawl, or to transmit torque unidirectionally between the input rack and the stop pawl, or to transmit torque unidirectionally between two adjacent fixed reducing gear sets.
[0015] This utility model of an electronic torque limiting wrench adds one or more sets of force-reducing gears to the rear end of the tripping mechanism. Since the gears can rotate 360 degrees, the movement range of the front lever can be expanded, the force reduction ratio can be increased, the torque required for the final locking can be reduced, the contact stress can be reduced, and the service life can be increased. Attached Figure Description
[0016] This manual includes the following figures, which illustrate the following:
[0017] Figure 1 is a structural schematic diagram of the electronic torque limiting wrench of Embodiment 1;
[0018] Figure 2 is a structural schematic diagram of the electronic torque limiting wrench of Embodiment 2;
[0019] Figure 3 is a schematic diagram of the electronic torque limiting wrench of Embodiment 3;
[0020] Figure 4 is a structural schematic diagram of the electronic torque limiting wrench of Embodiment 4;
[0021] Figure 5 is a structural schematic diagram of the electronic torque limiting wrench of Embodiment 5;
[0022] Figure 6 is a structural schematic diagram of the electronic torque limiting wrench of Embodiment 6;
[0023] Figure 7 is a structural schematic diagram of an existing electronic torque limiter with a lever structure;
[0024] Figure 8 is a structural schematic diagram of another existing electronic torque limiting wrench;
[0025] The following are labeled in the diagram: 1. Input lever; 2. Force application handle; 3. Handle; 4. Force reduction lever; 5. Stop pawl; 6. Release lever; 7. Stop lever; 8. Force relief shaft; 9. First shaft; 10. Electric force relief mechanism; 11. Return spring; 12. Contact point; 13. Elastic body; 14. Electronic display device; 15. Striking head; 16. Force relief and force reduction gear set; 17. Input rack; 18. Force-bearing component; 19. Strain gauge; 20. Arc rack; 21. Input gear; 22. Output gear; 23. Second shaft; 24. Third shaft; 25. Actuator. Detailed Implementation
[0026] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, in order to help those skilled in the art to have a more complete, accurate and in-depth understanding of the concept and technical solution of this utility model, and to facilitate its implementation.
[0027] It should be noted that in the following embodiments, the terms "first," "second," and "third" do not represent an absolute distinction in structure and / or function, nor do they represent the order of execution; they are merely for the convenience of description.
[0028] Example 1
[0029] As shown in Figure 1, this embodiment provides an electronic torque limiting wrench, including an input lever 1, a force application handle 2, a handle 3, a lever reducing mechanism, a stop pawl 5, a force reduction gear set 16, and an input rack 17. The force reduction gear set 16 is composed of gears that can rotate 360 degrees. The lever reducing mechanism is located between the input lever 1 and the input rack 17 and is used to transmit torque between the input lever 1 and the input rack 17. The input lever 1 is connected to the force application handle 2. The force reduction gear set 16 is located between the stop pawl 5 and the input rack 17. The input rack 17 has an arc-shaped rack that meshes with the input end of the force reduction gear set 16. The stop pawl 5 is used to lock the output end of the force reduction gear set 16.
[0030] Specifically, as shown in Figure 1, the handle 3 is a hollow tubular structure. A force-receiving component 18 is installed within the inner cavity of the handle 3. The force-receiving component 18 is used to mount the wrench head, which is located outside the handle 3. A strain gauge 19 is mounted on the force-receiving component 18. The input lever 1, the force-applying handle 2, the handle 3, the lever reducing mechanism, the stop pawl 5, the electric force-relieving mechanism 10, and the input rack 17 are located within the inner cavity of the handle 3. The input lever 1 is rotatably connected to the handle 3 via a first rotating shaft, the input rack 17 is rotatably connected to the handle 3 via a second rotating shaft, and the stop pawl 5 is rotatably connected to the handle 3 via a third rotating shaft. The axes of the first, second, and third rotating shafts are parallel and perpendicular to the length direction of the handle 3. One end of the input lever 1 is fixedly connected to the force-applying handle 2, which is located outside the handle 3. The handle 3 is located between the force-applying handle 2 and the wrench head. The other end of the input lever 1 is provided with a step, and the first rotating shaft is located between the two ends of the input lever 1.
[0031] As shown in Figure 1, the lever reducing mechanism includes a reducing lever 4, which is disposed between the input rack 17 and the input lever 1. The reducing lever 4 is rotatably connected to the handle 3 through a fourth rotating shaft, and the axis of the fourth rotating shaft is parallel to the axis of the third rotating shaft.
[0032] As shown in Figure 1, a reducing lever 4 is provided. The reducing lever 4 is a T-shaped planar block with steps at both ends. A fourth rotating shaft is located between the two ends of the reducing lever 4. One end of the input rack 17 has a step, and an arc-shaped rack is fixedly installed at the other end of the input rack 17. A second rotating shaft is located between the two ends of the input rack 1. One end of the input lever 1 has a step. The steps at both ends of the reducing lever 4 contact the end steps of the input rack 17 and the end steps of the input lever 1, respectively. When the input lever 1 rotates, it drives the input rack 17 to rotate through the reducing lever 4, thus transmitting torque.
[0033] As shown in Figure 1, the arc-shaped rack has a tooth groove into which the teeth of the input end component of the unloading and reducing gear set 16 are embedded. The input end component is a gear. A stop pawl 5 is used to lock the output end component of the unloading and reducing gear set 16. The stop pawl 5 has a stop tooth that is embedded in the tooth groove of the output end component, which is also a gear. One stop tooth is provided, fixedly connected to the stop pawl 5, and extends outward from the stop pawl 5. After the stop tooth is embedded in the tooth groove of the output end component of the unloading and reducing gear set 16, it limits the rotation of the output end component.
[0034] The electric unloading mechanism 10 is connected to the stop pawl 5. The electric unloading mechanism 10 is used to control the rotation of the stop pawl 5. By controlling the rotation of the stop pawl 5 through the electric unloading mechanism 10, the stop teeth can selectively engage and disengage with the output end component of the unloading and reducing gear set 16.
[0035] When the tightening torque reaches the preset value, the stop teeth on the stop pawl 5 disengage from the output end component of the unloading and reducing gear set 16, and the operating force applied to the force application handle 2 is transmitted to the input end of the unloading and reducing gear set 16 through the arc rack, so that the unloading and reducing gear set 16 can rotate freely and unload the operating force acting on the force application handle 2.
[0036] As shown in Figure 1, a return spring 11 is installed inside the handle 3 to apply an elastic force to the input rack 17. The return spring 11 is a cylindrical helical spring and a compression spring. The return spring 11 is sandwiched between the input rack 17 and the inner wall of the handle 3. The elastic force applied by the return spring 11 to the input rack 17 allows the input rack 17 to rotate. The return spring 11 is used to realize the rotational reset of the input rack 17, the force application handle 2, and the lever reducing mechanism, etc., to prepare for the next tightening operation.
[0037] The unloading and reducing gear set 16 includes multiple gear sets, each consisting of two coaxially arranged gears. The gears of adjacent gear sets mesh to form a single-stage gear transmission mechanism. As shown in Figure 1, in this embodiment, the unloading and reducing gear set 16 includes two gear sets, with a total of four gears. One gear set is a unidirectional reducing gear set, and the other gear set is a fixed reducing gear set.
[0038] The unloading and reducing gear set 16 includes one set of unidirectional reducing gear sets and one set of fixed reducing gear sets; or the unidirectional reducing gear set is used to transmit torque unidirectionally between the stop pawl and the fixed reducing gear set; or the unidirectional reducing gear set is used to transmit torque unidirectionally between the arc-shaped rack and the fixed reducing gear set. The unidirectional reducing gear set is used to transmit torque unidirectionally, and the unidirectional reducing gear set is provided with a unidirectional mechanism, which is located between the gear and the shaft. The unidirectional mechanism is a unidirectional bearing or a unidirectional ratchet.
[0039] In this embodiment, as shown in Figure 1, the force-reducing gear set 16 includes a first gear set and a second gear set. The first gear set includes a first input gear and a first output gear. The diameter of the first input gear is smaller than the diameter of the first output gear. The first input gear is an input end component. The first input gear and the first output gear are coaxially fixedly connected and mounted on a fifth shaft, which is mounted on a shank 3. The second gear set includes a second input gear and a second output gear. The diameter of the second input gear is smaller than the diameter of the second output gear. The second input gear and the second output gear are coaxially fixedly connected and the second output gear is an output end component. The second input gear and the second output gear are mounted on a sixth shaft, which is mounted on a shank 3. The first output gear meshes with the second input gear to form a single-stage gear transmission mechanism. The axes of the fifth and sixth shafts are parallel to the axis of the fourth shaft. The first gear set is a unidirectional force-reducing gear set, and the second gear set is a fixed force-reducing gear set.
[0040] Example 2
[0041] As shown in Figure 2, this embodiment provides an electronic torque limiting wrench, including an input lever 1, a force application handle 2, a handle 3, a lever reducing mechanism, a stop pawl 5, a force reduction gear set 16, and an input rack 17. The force reduction gear set 16 is composed of gears that can rotate 360 degrees. The lever reducing mechanism is located between the input lever 1 and the input rack 17 and is used to transmit torque between the input lever 1 and the input rack 17. The input lever 1 is connected to the force application handle 2. The force reduction gear set 16 is located between the stop pawl 5 and the input rack 17. The input rack 17 has an arc-shaped rack that meshes with the input end of the force reduction gear set 16. The stop pawl 5 is used to lock the output end of the force reduction gear set 16.
[0042] Specifically, as shown in Figure 2, the handle 3 is a hollow tubular structure. A force-receiving component 18 is installed within the inner cavity of the handle 3. The force-receiving component 18 is used to mount the wrench head, which is located outside the handle 3. A strain gauge 19 is mounted on the force-receiving component 18. The input lever 1, the force-applying handle 2, the handle 3, the lever reducing mechanism, the stop pawl 5, the electric unloading mechanism 10, and the input rack 17 are located within the inner cavity of the handle 3. The input lever 1 is rotatably connected to the handle 3 via a first rotating shaft, the input rack 17 is rotatably connected to the handle 3 via a second rotating shaft, and the stop pawl 5 is rotatably connected to the handle 3 via a third rotating shaft. The axes of the first, second, and third rotating shafts are parallel and perpendicular to the length direction of the handle 3. One end of the input lever 1 is fixedly connected to the force-applying handle 2, which is located outside the handle 3. The handle 3 is located between the force-applying handle 2 and the wrench head. The other end of the input lever 1 is provided with a step, and the first rotating shaft is located between the two ends of the input lever 1.
[0043] As shown in Figure 2, the lever reducing mechanism includes a reducing lever 4, which is disposed between the input rack 17 and the input lever 1. The reducing lever 4 is rotatably connected to the handle 3 through a fourth rotating shaft, and the axis of the fourth rotating shaft is parallel to the axis of the third rotating shaft.
[0044] As shown in Figure 2, a reducing lever 4 is provided. The reducing lever 4 is a T-shaped planar block with steps at both ends. A fourth rotating shaft is located between the two ends of the reducing lever 4. One end of the input rack 17 has a step, and an arc-shaped rack is fixedly installed at the other end of the input rack 17. A second rotating shaft is located between the two ends of the input rack 1. One end of the input lever 1 has a step. The steps at both ends of the reducing lever 4 contact the end steps of the input rack 17 and the end steps of the input lever 1, respectively. When the input lever 1 rotates, it drives the input rack 17 to rotate through the reducing lever 4, thus transmitting torque.
[0045] As shown in Figure 2, the arc-shaped rack has a tooth groove into which the teeth of the input end component of the unloading and reducing gear set 16 are embedded. The input end component is a gear. A stop pawl 5 is used to lock the output end component of the unloading and reducing gear set 16. The stop pawl 5 has a stop tooth that is embedded in the tooth groove of the output end component, which is also a gear. One stop tooth is provided, fixedly connected to the stop pawl 5, and extends outward from the stop pawl 5. After the stop tooth is embedded in the tooth groove of the output end component of the unloading and reducing gear set 16, it limits the rotation of the output end component.
[0046] The electric unloading mechanism 10 is connected to the stop pawl 5. The electric unloading mechanism 10 is used to control the rotation of the stop pawl 5. By controlling the rotation of the stop pawl 5 through the electric unloading mechanism 10, the stop teeth can selectively engage and disengage with the output end component of the unloading and reducing gear set 16.
[0047] When the tightening torque reaches the preset value, the stop teeth on the stop pawl 5 disengage from the output end component of the unloading and reducing gear set 16, and the operating force applied to the force application handle 2 is transmitted to the input end of the unloading and reducing gear set 16 through the arc rack, so that the unloading and reducing gear set 16 can rotate freely and unload the operating force acting on the force application handle 2.
[0048] As shown in Figure 2, a return spring 11 is installed inside the handle 3 to apply an elastic force to the reducing lever 4. The return spring 11 is a cylindrical helical spring and a compression spring. The return spring 11 is sandwiched between the reducing lever 4 and the inner wall of the handle 3. The elastic force applied by the return spring 11 to the reducing lever 4 allows the reducing lever 4 to rotate. The return spring 11 is used to realize the rotational reset of the input rack 17, the force application handle 2, and the lever reducing mechanism, etc., to prepare for the next tightening operation.
[0049] As shown in Figure 2, in this embodiment, the unloading and reducing gear set 16 includes three gear sets, with a total of six gears. One gear set is a unidirectional reducing gear set, and the other two gear sets are fixed reducing gear sets.
[0050] The torque-reducing gear set 16 includes one set of unidirectional torque-reducing gear sets and two sets of fixed torque-reducing gear sets. The unidirectional torque-reducing gear sets are used to transmit torque unidirectionally between two adjacent fixed torque-reducing gear sets; or, they are used to transmit torque unidirectionally between the stop pawl and the fixed torque-reducing gear sets; or they are used to transmit torque unidirectionally between the arc-shaped rack and the fixed torque-reducing gear sets. The unidirectional torque-reducing gear sets are equipped with a unidirectional mechanism, which is located between the gear and the shaft. The unidirectional mechanism can be a unidirectional bearing or a unidirectional ratchet.
[0051] In this embodiment, as shown in Figure 2, the unloading and reducing gear set 16 includes a first gear set, a second gear set, and a third gear set. The first gear set includes a first input gear and a first output gear. The diameter of the first input gear is smaller than the diameter of the first output gear. The first input gear is an input end component. The first input gear and the first output gear are coaxially fixedly connected and mounted on a fifth shaft, which is mounted on a shank 3. The second gear set includes a second input gear and a second output gear. The diameter of the second input gear is smaller than the diameter of the second output gear. The second input gear and the second output gear are coaxially fixedly connected and mounted on a sixth shaft, which is mounted on a shank 3. The first output gear meshes with the second input gear, forming a single-stage gear transmission mechanism. The axes of the fifth and sixth shafts are parallel to the axis of the fourth shaft. The third gear set includes a third input gear and a third output gear. The diameter of the third input gear is smaller than that of the third output gear. The third input gear and the third output gear are coaxially and fixedly connected. The third output gear is an output end component. The third input gear and the third output gear are mounted on the seventh shaft, which is mounted on the shank 3. The second output gear meshes with the third input gear, forming a single-stage gear transmission mechanism. The axis of the seventh shaft is parallel to the axis of the fourth shaft. The second gear set is a unidirectional reducing gear set, while the first and third gear sets are fixed reducing gear sets.
[0052] Example 3
[0053] As shown in Figure 3, this embodiment provides an electronic torque limiting wrench, including an input lever 1, a force application handle 2, a handle 3, a lever reducing mechanism, a stop pawl 5, a force reduction gear set 16, and an input rack 17. The force reduction gear set 16 is composed of gears that can rotate 360 degrees. The lever reducing mechanism is located between the input lever 1 and the input rack 17 and is used to transmit torque between the input lever 1 and the input rack 17. The input lever 1 is connected to the force application handle 2. The force reduction gear set 16 is located between the stop pawl 5 and the input rack 17. The input rack 17 has an arc-shaped rack that meshes with the input end of the force reduction gear set 16. The stop pawl 5 is used to lock the output end of the force reduction gear set 16.
[0054] Specifically, as shown in Figure 3, the handle 3 is a hollow tubular structure. A force-receiving component 18 is installed within the inner cavity of the handle 3. The force-receiving component 18 is used to mount the wrench head, which is located outside the handle 3. A strain gauge 19 is mounted on the force-receiving component 18. The input lever 1, the force-applying handle 2, the handle 3, the lever reducing mechanism, the stop pawl 5, the electric force-relieving mechanism 10, and the input rack 17 are located within the inner cavity of the handle 3. The input lever 1 is rotatably connected to the handle 3 via a first rotating shaft, the input rack 17 is rotatably connected to the handle 3 via a second rotating shaft, and the stop pawl 5 is rotatably connected to the handle 3 via a third rotating shaft. The axes of the first, second, and third rotating shafts are parallel, and their axes are perpendicular to the length direction of the handle 3. One end of the input lever 1 is fixedly connected to the force-applying handle 2, which is located outside the handle 3. The handle 3 is located between the force-applying handle 2 and the wrench head. The other end of the input lever 1 is provided with a step, and the first rotating shaft is located between the two ends of the input lever 1.
[0055] As shown in Figure 3, the lever reducing mechanism includes a reducing lever 4, which is disposed between the input rack 17 and the input lever 1. The reducing lever 4 is rotatably connected to the handle 3 through a fourth rotating shaft, and the axis of the fourth rotating shaft is parallel to the axis of the third rotating shaft.
[0056] As shown in Figure 3, a reducing lever 4 is provided. The reducing lever 4 is a T-shaped planar block with steps at both ends. A fourth rotating shaft is located between the two ends of the reducing lever 4. One end of the input rack 17 has a step, and an arc-shaped rack is fixedly installed at the other end of the input rack 17. A second rotating shaft is located between the two ends of the input rack 1. One end of the input lever 1 has a step. The steps at both ends of the reducing lever 4 contact the end steps of the input rack 17 and the end steps of the input lever 1, respectively. When the input lever 1 rotates, it drives the input rack 17 to rotate through the reducing lever 4, thus transmitting torque.
[0057] As shown in Figure 3, the arc-shaped rack has a tooth groove into which the teeth of the input end component of the unloading and reducing gear set 16 are embedded. The input end component is a gear. A stop pawl 5 is used to lock the output end component of the unloading and reducing gear set 16. The stop pawl 5 has a stop tooth that is embedded in the tooth groove of the output end component, which is also a gear. One stop tooth is provided, fixedly connected to the stop pawl 5, and extends outward from the stop pawl 5. After the stop tooth is embedded in the tooth groove of the output end component of the unloading and reducing gear set 16, it limits the rotation of the output end component.
[0058] The electric unloading mechanism 10 is connected to the stop pawl 5. The electric unloading mechanism 10 is used to control the rotation of the stop pawl 5. By controlling the rotation of the stop pawl 5 through the electric unloading mechanism 10, the stop teeth can selectively engage and disengage with the output end component of the unloading and reducing gear set 16.
[0059] When the tightening torque reaches the preset value, the stop teeth on the stop pawl 5 disengage from the output end component of the unloading and reducing gear set 16, and the operating force applied to the force application handle 2 is transmitted to the input end of the unloading and reducing gear set 16 through the arc rack, so that the unloading and reducing gear set 16 can rotate freely and unload the operating force acting on the force application handle 2.
[0060] As shown in Figure 3, a return spring 11 is installed inside the handle 3 to apply an elastic force to the reducing lever 4. The return spring 11 is a cylindrical helical spring and a compression spring. The return spring 11 is sandwiched between the reducing lever 4 and the inner wall of the handle 3. The elastic force applied by the return spring 11 to the reducing lever 4 allows the reducing lever 4 to rotate. The return spring 11 is used to realize the rotational reset of the input rack 17, the force application handle 2, and the lever reducing mechanism, etc., to prepare for the next tightening operation.
[0061] As shown in Figure 3, in this embodiment, the unloading and reducing gear set 16 includes a gear set composed of two coaxially arranged gears. This gear set is a one-way reducing gear set. The one-way reducing gear set is used to transmit torque unidirectionally between the arc-shaped rack and the stop pawl 5. The one-way reducing gear set is equipped with a one-way mechanism, which is located between the gear and the shaft. The one-way mechanism is a one-way bearing or a one-way ratchet.
[0062] In this embodiment, as shown in FIG3, the unloading and reducing gear set 16 includes a first input gear and a first output gear. The diameter of the first input gear is smaller than the diameter of the first output gear. The first input gear is an input end component, and the first output gear is an output end component. The first input gear and the first output gear are disposed on the fifth shaft. The fifth shaft is mounted on the handle 3, and the axis of the fifth shaft is parallel to the axis of the fourth shaft.
[0063] Example 4
[0064] As shown in Figure 4, this embodiment provides an electronic torque limiting wrench, including an input lever 1, a force application handle 2, a handle 3, a stop pawl 5, a force reduction gear set 16, and an input rack 17. The force reduction gear set 16 is composed of gears that can rotate 360 degrees. The input lever 1 is connected to the force application handle 2. The force reduction gear set 16 is disposed between the stop pawl 5 and the input rack 17. The input rack 17 has an arc-shaped rack that meshes with the input end of the force reduction gear set 16. The stop pawl 5 is used to lock the output end of the force reduction gear set 16.
[0065] Specifically, as shown in Figure 4, the handle 3 is a hollow tubular structure. A force-receiving component 18 is installed within the inner cavity of the handle 3. The force-receiving component 18 is used to mount the wrench head, which is located outside the handle 3. A strain gauge 19 is mounted on the force-receiving component 18. The input lever 1, the force-applying handle 2, the handle 3, the stop pawl 5, the electric force-relieving mechanism 10, and the input rack 17 are located within the inner cavity of the handle 3. The input lever 1 is rotatably connected to the handle 3 via a first rotating shaft, the input rack 17 is rotatably connected to the handle 3 via a second rotating shaft, and the stop pawl 5 is rotatably connected to the handle 3 via a third rotating shaft. The axes of the first, second, and third rotating shafts are parallel, and their axes are perpendicular to the length direction of the handle 3. One end of the input lever 1 is fixedly connected to the force-applying handle 2, which is located outside the handle 3. The handle 3 is located between the force-applying handle 2 and the wrench head. The other end of the input lever 1 is provided with a step, and the first rotating shaft is located between the two ends of the input lever 1.
[0066] As shown in Figure 4, the arc-shaped rack has a tooth groove into which the teeth of the input end component of the unloading and reducing gear set 16 are embedded. The input end component is a gear. A stop pawl 5 is used to lock the output end component of the unloading and reducing gear set 16. The stop pawl 5 has a stop tooth that is embedded in the tooth groove of the output end component, which is also a gear. One stop tooth is provided, fixedly connected to the stop pawl 5, and extends outward from the stop pawl 5. After the stop tooth is embedded in the tooth groove of the output end component of the unloading and reducing gear set 16, it limits the rotation of the output end component.
[0067] The electric unloading mechanism 10 is connected to the stop pawl 5. The electric unloading mechanism 10 is used to control the rotation of the stop pawl 5. By controlling the rotation of the stop pawl 5 through the electric unloading mechanism 10, the stop teeth can selectively engage and disengage with the output end component of the unloading and reducing gear set 16.
[0068] When the tightening torque reaches the preset value, the stop teeth on the stop pawl 5 disengage from the output end component of the unloading and reducing gear set 16, and the operating force applied to the force application handle 2 is transmitted to the input end of the unloading and reducing gear set 16 through the arc rack, so that the unloading and reducing gear set 16 can rotate freely and unload the operating force acting on the force application handle 2.
[0069] As shown in Figure 4, a return spring 11 is provided inside the handle 3 to apply an elastic force to the input rack 17. The return spring 11 is a cylindrical helical spring and a compression spring. The return spring 11 is sandwiched between the input rack 17 and the inner wall of the handle 3. The elastic force applied by the return spring 11 to the input rack 17 allows the input rack 17 to rotate. The return spring 11 is used to realize the rotational reset of the input rack 17, the force application handle 2, etc., to prepare for the next tightening operation.
[0070] The unloading and reducing gear set 16 includes multiple gear sets, each consisting of two coaxially arranged gears. The gears of adjacent gear sets mesh to form a single-stage gear transmission mechanism. As shown in Figure 4, in this embodiment, the unloading and reducing gear set 16 includes two gear sets, with a total of four gears. One gear set is a unidirectional reducing gear set, and the other gear set is a fixed reducing gear set.
[0071] The unloading and reducing gear set 16 includes one set of unidirectional reducing gear sets and one set of fixed reducing gear sets. The unidirectional reducing gear sets are used to transmit torque unidirectionally between the arc-shaped rack and the fixed reducing gear sets, or to transmit torque unidirectionally between the fixed reducing gear sets and the stop pawl 5. The unidirectional reducing gear sets are used to transmit torque unidirectionally and are equipped with a unidirectional mechanism located between the gear and the shaft. The unidirectional mechanism can be a unidirectional bearing or a unidirectional ratchet.
[0072] In this embodiment, as shown in Figure 4, the force-reducing gear set 16 includes a first gear set and a second gear set. The first gear set includes a first input gear and a first output gear. The diameter of the first input gear is smaller than the diameter of the first output gear. The first input gear is an input end component. The first input gear and the first output gear are coaxially fixedly connected and mounted on a fifth shaft, which is mounted on a shank 3. The second gear set includes a second input gear and a second output gear. The diameter of the second input gear is smaller than the diameter of the second output gear. The second input gear and the second output gear are coaxially fixedly connected and the second output gear is an output end component. The second input gear and the second output gear are mounted on a sixth shaft, which is mounted on a shank 3. The first output gear meshes with the second input gear to form a single-stage gear transmission mechanism. The axes of the fifth and sixth shafts are parallel to the axis of the fourth shaft. The first gear set is a unidirectional force-reducing gear set, and the second gear set is a fixed force-reducing gear set.
[0073] Example 5
[0074] As shown in Figure 5, this embodiment provides an electronic torque limiting wrench, including an input lever 1, a force application handle 2, a handle 3, a stop pawl 5, a force reduction gear set 16, and an input rack 17. The force reduction gear set 16 is composed of gears that can rotate 360 degrees. It is positioned between the input lever 1 and the input rack 17 and is used to transmit torque between them. The input lever 1 is connected to the force application handle 2. The force reduction gear set 16 is positioned between the stop pawl 5 and the input rack 17. The input rack 17 has an arc-shaped rack that meshes with the input end of the force reduction gear set 16. The stop pawl 5 is used to lock the output end of the force reduction gear set 16.
[0075] Specifically, as shown in Figure 5, the handle 3 is a hollow tubular structure. A force-receiving component 18 is installed within the inner cavity of the handle 3. The force-receiving component 18 is used to mount the wrench head, which is located outside the handle 3. A strain gauge 19 is mounted on the force-receiving component 18. The input lever 1, the force-applying handle 2, the handle 3, the stop pawl 5, the electric force-relieving mechanism 10, and the input rack 17 are located within the inner cavity of the handle 3. The input lever 1 is rotatably connected to the handle 3 via a first rotating shaft, the input rack 17 is rotatably connected to the handle 3 via a second rotating shaft, and the stop pawl 5 is rotatably connected to the handle 3 via a third rotating shaft. The axes of the first, second, and third rotating shafts are parallel and perpendicular to the length direction of the handle 3. One end of the input lever 1 is fixedly connected to the force-applying handle 2, which is located outside the handle 3. The handle 3 is located between the force-applying handle 2 and the wrench head. The other end of the input lever 1 is provided with a step, and the first rotating shaft is located between the two ends of the input lever 1.
[0076] As shown in Figure 5, the arc-shaped rack has a tooth groove into which the teeth of the input end component of the unloading and reducing gear set 16 are embedded. The input end component is a gear. A stop pawl 5 is used to lock the output end component of the unloading and reducing gear set 16. The stop pawl 5 has a stop tooth that is embedded in the tooth groove of the output end component, which is also a gear. One stop tooth is provided, fixedly connected to the stop pawl 5, and extends outward from the stop pawl 5. After the stop tooth is embedded in the tooth groove of the output end component of the unloading and reducing gear set 16, it limits the rotation of the output end component.
[0077] The electric unloading mechanism 10 is connected to the stop pawl 5. The electric unloading mechanism 10 is used to control the rotation of the stop pawl 5. By controlling the rotation of the stop pawl 5 through the electric unloading mechanism 10, the stop teeth can selectively engage and disengage with the output end component of the unloading and reducing gear set 16.
[0078] When the tightening torque reaches the preset value, the stop teeth on the stop pawl 5 disengage from the output end component of the unloading and reducing gear set 16, and the operating force applied to the force application handle 2 is transmitted to the input end of the unloading and reducing gear set 16 through the arc rack, so that the unloading and reducing gear set 16 can rotate freely and unload the operating force acting on the force application handle 2.
[0079] As shown in Figure 5, a return spring 11 is provided inside the handle 3 to apply an elastic force to the input rack 17. The return spring 11 is a cylindrical helical spring and a compression spring. The return spring 11 is sandwiched between the input rack 17 and the inner wall of the handle 3. The elastic force applied by the return spring 11 to the input rack 17 allows the input rack 17 to rotate. The return spring 11 is used to realize the rotational reset of the input rack 17, the force application handle 2, etc., to prepare for the next tightening operation.
[0080] As shown in Figure 5, in this embodiment, the unloading and reducing gear set 16 includes three gear sets, with a total of six gears. One gear set is a unidirectional reducing gear set, and the other two gear sets are fixed reducing gear sets.
[0081] The unloading and reducing gear set 16 includes one set of unidirectional reducing gear sets and two sets of fixed reducing gear sets. The unidirectional reducing gear sets are used to transmit torque unidirectionally between two adjacent fixed reducing gear sets, or between the stop pawl and the fixed reducing gear sets, or between the input rack and the fixed reducing gear sets. The unidirectional reducing gear sets are equipped with a unidirectional mechanism located between the gear and the shaft. The unidirectional mechanism can be a unidirectional bearing or a unidirectional ratchet.
[0082] In this embodiment, as shown in FIG5, the unloading and reducing gear set 16 includes a first gear set, a second gear set, and a third gear set. The first gear set includes a first input gear and a first output gear. The diameter of the first input gear is smaller than the diameter of the first output gear. The first input gear is an input end component. The first input gear and the first output gear are coaxially fixedly connected. The first input gear and the first output gear are mounted on a fifth shaft, which is mounted on a shank 3. The second gear set includes a second input gear and a second output gear. The diameter of the second input gear is smaller than the diameter of the second output gear. The second input gear and the second output gear are coaxially fixedly connected. The second input gear and the second output gear are mounted on a sixth shaft, which is mounted on a shank 3. The first output gear meshes with the second input gear, forming a single-stage gear transmission mechanism. The axes of the fifth and sixth shafts are parallel to the axis of the fourth shaft. The third gear set includes a third input gear and a third output gear. The diameter of the third input gear is smaller than that of the third output gear. The third input gear and the third output gear are coaxially and fixedly connected. The third output gear is an output end component. The third input gear and the third output gear are mounted on the seventh shaft, which is mounted on the shank 3. The second output gear meshes with the third input gear, forming a single-stage gear transmission mechanism. The axis of the seventh shaft is parallel to the axis of the fourth shaft. The second gear set is a unidirectional reducing gear set, while the first and third gear sets are fixed reducing gear sets.
[0083] Example 6
[0084] As shown in Figure 6, this embodiment provides an electronic torque limiting wrench, including an input lever 1, a force application handle 2, a handle 3, a stop pawl 5, a force reduction gear set 16, and an input rack 17. The force reduction gear set 16 is composed of gears that can rotate 360 degrees. It is positioned between the input lever 1 and the input rack 17 and is used to transmit torque between them. The input lever 1 is connected to the force application handle 2. The force reduction gear set 16 is positioned between the stop pawl 5 and the input rack 17. The input rack 17 has an arc-shaped rack that meshes with the input end of the force reduction gear set 16. The stop pawl 5 is used to lock the output end of the force reduction gear set 16.
[0085] Specifically, as shown in Figure 6, the handle 3 is a hollow tubular structure. A force-receiving component 18 is installed within the inner cavity of the handle 3. The force-receiving component 18 is used to mount the wrench head, which is located outside the handle 3. A strain gauge 19 is mounted on the force-receiving component 18. The input lever 1, the force-applying handle 2, the handle 3, the stop pawl 5, the electric force-relieving mechanism 10, and the input rack 17 are located within the inner cavity of the handle 3. The input lever 1 is rotatably connected to the handle 3 via a first rotating shaft, the input rack 17 is rotatably connected to the handle 3 via a second rotating shaft, and the stop pawl 5 is rotatably connected to the handle 3 via a third rotating shaft. The axes of the first, second, and third rotating shafts are parallel, and their axes are perpendicular to the length direction of the handle 3. One end of the input lever 1 is fixedly connected to the force-applying handle 2, which is located outside the handle 3. The handle 3 is located between the force-applying handle 2 and the wrench head. The other end of the input lever 1 is provided with a step, and the first rotating shaft is located between the two ends of the input lever 1.
[0086] As shown in Figure 6, the arc-shaped rack has a tooth groove into which the teeth of the input end component of the unloading and reducing gear set 16 are embedded. The input end component is a gear. A stop pawl 5 is used to lock the output end component of the unloading and reducing gear set 16. The stop pawl 5 has a stop tooth that is embedded in the tooth groove of the output end component, which is also a gear. One stop tooth is provided, fixedly connected to the stop pawl 5, and extends outward from the stop pawl 5. After the stop tooth is embedded in the tooth groove of the output end component of the unloading and reducing gear set 16, it limits the rotation of the output end component.
[0087] The electric unloading mechanism 10 is connected to the stop pawl 5. The electric unloading mechanism 10 is used to control the rotation of the stop pawl 5. By controlling the rotation of the stop pawl 5 through the electric unloading mechanism 10, the stop teeth can selectively engage and disengage with the output end component of the unloading and reducing gear set 16.
[0088] When the tightening torque reaches the preset value, the stop teeth on the stop pawl 5 disengage from the output end component of the unloading and reducing gear set 16, and the operating force applied to the force application handle 2 is transmitted to the input end of the unloading and reducing gear set 16 through the arc rack, so that the unloading and reducing gear set 16 can rotate freely and unload the operating force acting on the force application handle 2.
[0089] As shown in Figure 6, a return spring 11 is provided inside the handle 3 to apply an elastic force to the input rack 17. The return spring 11 is a cylindrical helical spring and a compression spring. The return spring 11 is sandwiched between the input rack 17 and the inner wall of the handle 3. The elastic force applied by the return spring 11 to the input rack 17 allows the input rack 17 to rotate. The return spring 11 is used to realize the rotational reset of the input rack 17, the force application handle 2, etc., to prepare for the next tightening operation.
[0090] As shown in Figure 6, in this embodiment, the unloading and reducing gear set 16 includes a gear set composed of two coaxially arranged gears. This gear set is a one-way reducing gear set. The one-way reducing gear set is used to transmit torque unidirectionally between the arc-shaped rack and the stop pawl 5. The one-way reducing gear set is equipped with a one-way mechanism, which is located between the gear and the shaft. The one-way mechanism is a one-way bearing or a one-way ratchet.
[0091] In this embodiment, as shown in FIG6, the unloading and reducing gear set 16 includes a first input gear and a first output gear. The diameter of the first input gear is smaller than the diameter of the first output gear. The first input gear is an input end component, and the first output gear is an output end component. The first input gear and the first output gear are disposed on the fifth shaft. The fifth shaft is mounted on the handle 3, and the axis of the fifth shaft is parallel to the axis of the fourth shaft.
[0092] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.
Claims
1. An electronic torque limiting wrench, comprising an input lever, a force application handle, a handle portion, a lever force reduction mechanism, and a stop pawl, characterized in that: It also includes a force-reducing gear set and an input rack. The force-reducing gear set is composed of gears. The lever reducing mechanism is disposed between the input lever and the input rack and is used to transmit torque between the input lever and the input rack. The input lever is connected to the force-applying handle. The force-reducing gear set is disposed between the stop pawl and the input rack. The input rack is provided with an arc-shaped rack that meshes with the input end of the force-reducing gear set. The stop pawl is used to lock the output end of the force-reducing gear set.
2. The electronic torque limiting wrench according to claim 1, characterized in that: The input lever is rotatably connected to the handle via a first rotating shaft, the input rack is rotatably connected to the handle via a second rotating shaft, and the stop pawl is rotatably connected to the handle via a third rotating shaft.
3. The electronic torque wrench of claim 2, wherein: The lever reducing mechanism includes a reducing lever, and at least one reducing lever is provided. The reducing lever is rotatably connected to the handle through a fourth rotating shaft.
4. The electronic torque wrench of any one of claims 1 to 3, wherein: The unloading and reducing gear set includes multiple gear sets, each gear set consisting of two coaxially arranged gears. The gears of adjacent gear sets mesh to form a single-stage gear transmission mechanism.
5. The electronic torque wrench of claim 4, wherein: The unloading and reducing gear set includes a unidirectional reducing gear set and a fixed reducing gear set. At least one unidirectional reducing gear set is provided. The unidirectional reducing gear set is used to transmit torque unidirectionally between the arc-shaped rack and the fixed reducing gear set, or to transmit torque unidirectionally between the fixed reducing gear set and the stop pawl, or to transmit torque unidirectionally between the input rack and the stop pawl, or to transmit torque unidirectionally between two adjacent fixed reducing gear sets.
6. An electronic torque limiting wrench, comprising an input lever, a force application handle, a shank, and a stop pawl, characterized in that: It also includes a force-reducing gear set and an input rack. The force-reducing gear set is composed of gears. The input lever is connected to the force-applying handle. The force-reducing gear set is located between the stop pawl and the input rack. The input rack is provided with an arc-shaped rack that meshes with the input end of the force-reducing gear set. The stop pawl is used to lock the output end of the force-reducing gear set.
7. The electronic torque wrench of claim 6, wherein: The input lever is rotatably connected to the handle via a first rotating shaft, the input rack is rotatably connected to the handle via a second rotating shaft, and the stop pawl is rotatably connected to the handle via a third rotating shaft.
8. The electronic torque wrench of claim 2, wherein: The stop pawl is connected to an electric unloading mechanism, which controls the rotation of the stop pawl.
9. The electronic torque wrench of any one of claims 6 to 8, wherein: The unloading and reducing gear set includes multiple gear sets, each gear set consisting of two coaxially arranged gears. The gears of adjacent gear sets mesh to form a single-stage gear transmission mechanism.
10. The electronic torque wrench of claim 9, wherein: The unloading and reducing gear set includes a unidirectional reducing gear set and a fixed reducing gear set. At least one unidirectional reducing gear set is provided. The unidirectional reducing gear set is used to transmit torque unidirectionally between the arc-shaped rack and the fixed reducing gear set, or to transmit torque unidirectionally between the fixed reducing gear set and the stop pawl, or to transmit torque unidirectionally between the input rack and the stop pawl, or to transmit torque unidirectionally between two adjacent fixed reducing gear sets.
Citation Information
Patent Citations
Mechanical digital display constant torque wrench
CN114274088A