CN115106970B - Digital display torque wrench - Google Patents
Digital display torque wrench Download PDFInfo
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- CN115106970B CN115106970B CN202210883023.6A CN202210883023A CN115106970B CN 115106970 B CN115106970 B CN 115106970B CN 202210883023 A CN202210883023 A CN 202210883023A CN 115106970 B CN115106970 B CN 115106970B
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- 230000007246 mechanism Effects 0.000 claims abstract description 77
- 210000000078 claw Anatomy 0.000 claims description 31
- 230000005540 biological transmission Effects 0.000 claims description 26
- 230000009467 reduction Effects 0.000 claims description 20
- 238000000034 method Methods 0.000 abstract description 10
- 230000009471 action Effects 0.000 abstract description 7
- 230000036632 reaction speed Effects 0.000 abstract description 2
- 241000282472 Canis lupus familiaris Species 0.000 description 9
- 238000010586 diagram Methods 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 4
- 210000003781 tooth socket Anatomy 0.000 description 3
- 230000008569 process Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000000875 corresponding effect Effects 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
- B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
- B25B23/142—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for hand operated wrenches or screwdrivers
- B25B23/1422—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for hand operated wrenches or screwdrivers torque indicators or adjustable torque limiters
- B25B23/1425—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for hand operated wrenches or screwdrivers torque indicators or adjustable torque limiters by electrical means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B17/00—Hand-driven gear-operated wrenches or screwdrivers
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
- Transmission Devices (AREA)
Abstract
The invention discloses a digital display torque wrench which comprises a wrench body, a shell connected with the wrench body, a force reducing mechanism arranged in the shell, a rotatable force application handle, an arc-shaped rack arranged on the force application handle and meshed with the input end of the force reducing mechanism, and a stop dog for locking the output end of the force reducing mechanism. According to the digital display torque wrench, the force reducing principle of the force reducing mechanism is adopted to lock the force applying handle with smaller force, the tightening operation is completed, when the set torque value is reached, the force reducing mechanism rotates under the action of the force applying handle, the force applying handle rotates to discharge force, the torque limiting method does not depend on the reaction speed of a person, the torque can be accurately controlled, and therefore the accurate control of the tightening torque can be realized.
Description
The invention relates to a divisional application, the original application number is 202110112601.1, the application date is 2021, 1 and 27 days, and the invention name is an electronic force limiting method of a digital display torque wrench.
Technical Field
The invention belongs to the technical field of wrenches, and particularly relates to a digital display torque wrench.
Background
The existing digital display torque wrench force limiting mode mostly adopts sound, light and vibration signals to prompt an operator that the torque reaches a set value and stop applying force. Because of depending on the response of the person, time delay exists from the time when the wrench sends a prompt signal to the time when the person stops applying force, and the actual torque control accuracy is affected.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides a digital display torque wrench, and aims to realize accurate control of torque.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: the digital display torque wrench comprises a wrench body, a shell connected with the wrench body, a force reducing mechanism arranged in the shell, a rotatable force application handle, an arc-shaped rack arranged on the force application handle and meshed with the input end of the force reducing mechanism, and a stop dog used for locking the output end of the force reducing mechanism.
The arc-shaped rack is arranged in the shell through a first shaft, the force reducing mechanism comprises a unidirectional force reducing gear set, the unidirectional force reducing gear set comprises a second shaft, a first gear meshed with the arc-shaped rack, a second gear and an isolator arranged on the second shaft, the isolator is arranged between the first gear and the second shaft or between the second gear and the second shaft, the second gear is provided with a tooth groove for embedding the stop tooth, and the diameter of the first gear is smaller than that of the second gear; when the tightening operation is carried out, the first gear, the second gear and the second shaft synchronously rotate, and the unidirectional force reducing gear set transmits the torque from the arc-shaped rack to the locking claw; in the reset direction of the arc-shaped rack, the isolator slips and cannot transmit torque, the second gear does not rotate along with the first gear, and the force application handle is rotated to reset.
The arc-shaped rack is arranged in the shell through a first shaft, the force reducing mechanism comprises a unidirectional force reducing gear set and a fixed force reducing gear set, the fixed force reducing gear set is at least provided with 1 group, the unidirectional force reducing gear set is used for unidirectional torque transmission between the arc-shaped rack and the fixed force reducing gear set, or the unidirectional force reducing gear set is used for unidirectional torque transmission between the fixed force reducing gear set and the stop pawl, or the unidirectional force reducing gear set is used for unidirectional torque transmission between two adjacent fixed force reducing gear sets.
The fixed force reducing gear set is arranged between the unidirectional force reducing gear set and the stop pawl, the unidirectional force reducing gear set comprises a second shaft, a first gear, a second gear and an isolator arranged on the second shaft, the isolator is arranged between the first gear and the second shaft or between the second gear and the second shaft, the diameter of the first gear is smaller than that of the second gear, and the fixed force reducing gear set is provided with tooth grooves for embedding the stop teeth; when the tightening operation is carried out, the first gear, the second gear and the second shaft synchronously rotate, and the torque from the arc-shaped rack is sequentially transmitted to the stop dog through the unidirectional force reducing gear set and the fixed force reducing gear set; in the reset direction of the arc-shaped rack, the isolator slips and cannot transmit torque, and the second gear does not rotate along with the first gear.
The fixed force reducing gear set is provided with a group and consists of an input gear and an output gear, the diameter of the input gear is smaller than that of the output gear, the input gear is meshed with the second gear, and the output gear is provided with tooth grooves for embedding the stop teeth; or the fixed force reducing gear sets are arranged in a plurality of groups, each fixed force reducing gear set consists of an input gear and an output gear, the diameter of the input gear is smaller than that of the output gear, the second gear is used as an input end of the force reducing mechanism, the input gear is meshed with the second gear, the output gear at the tail end on the torque transmission route is provided with a tooth slot for embedding a stop tooth, the output gear is used as an output end of the force reducing mechanism, and for two adjacent fixed force reducing gear sets on the torque transmission route, the output gear of one fixed force reducing gear set is meshed with the input gear of the other fixed force reducing gear set.
The fixed force reducing gear set is arranged between the unidirectional force reducing gear set and the arc-shaped rack, the unidirectional force reducing gear set comprises a second shaft, a first gear, a second gear and an isolator arranged on the second shaft, the isolator is arranged between the first gear and the second shaft or between the second gear and the second shaft, the diameter of the first gear is smaller than that of the second gear, and the second gear is provided with tooth grooves for embedding the stop teeth; when the tightening operation is carried out, the first gear, the second gear and the second shaft synchronously rotate, and the torque from the arc-shaped rack is sequentially transmitted to the stop dog through the fixed force reducing gear set and the unidirectional force reducing gear set; in the reset direction of the arc-shaped rack, the isolator slips and cannot transmit torque, and the second gear does not rotate along with the first gear.
The fixed force reducing gear set is composed of an input gear and an output gear, the diameter of the input gear is smaller than that of the output gear, the input gear is meshed with the arc-shaped rack, and the output gear is meshed with the first gear; or the fixed force reducing gear sets are arranged in a plurality of groups, each fixed force reducing gear set consists of an input gear and an output gear, the diameter of the input gear is smaller than that of the output gear, the input gear serving as the input end of the force reducing mechanism is meshed with the arc-shaped rack, the output gear positioned at the tail end on the torque transmission route is meshed with the first gear, and for two adjacent fixed force reducing gear sets on the torque transmission route, the output gear of one fixed force reducing gear set is meshed with the input gear of the other fixed force reducing gear set.
The fixed force reducing gear sets are arranged in a plurality of groups, the unidirectional force reducing gear sets are arranged between two adjacent fixed force reducing gear sets, each fixed force reducing gear set is composed of an input gear and an output gear, the diameter of the input gear is smaller than that of the output gear, the input gear serving as an input end of the force reducing mechanism is meshed with the arc-shaped rack, the output gear at the tail end of the torque transmission route is provided with a tooth slot for embedding the stop tooth, the first gear is meshed with the output gear, and the second gear is meshed with the input gear.
The locking claw is rotationally connected with the shell through a third shaft, and an actuator for controlling the locking claw to rotate is arranged in the shell; the actuator controls the rotation of the pawl such that the pawl can be selectively engaged and disengaged with the fixed force reducing gear set.
And a reset spring which applies elastic acting force to the arc-shaped rack is arranged in the shell.
According to the digital display torque wrench, the force reducing principle of the force reducing mechanism is adopted to lock the force applying handle with smaller force, the tightening operation is completed, when the set torque value is reached, the force reducing mechanism rotates under the action of the force applying handle, the force applying handle rotates to discharge force, the torque limiting method does not depend on the reaction speed of a person, the torque can be accurately controlled, and therefore the accurate control of the tightening torque can be realized.
Drawings
The present specification includes the following drawings, the contents of which are respectively:
FIG. 1 is a cross-sectional view of a digital torque wrench;
FIG. 2 is another cross-sectional view of the digital torque wrench;
FIG. 3 is a schematic diagram of the external structure of the digital torque wrench;
FIG. 4 is a schematic illustration of the engagement of the pawl with the force reducing mechanism;
FIG. 5 is a schematic structural view of a force reducing mechanism;
FIG. 6 is a schematic diagram of the internal structure of the digital torque wrench without the fixed force reducing gear set;
FIG. 7 is a schematic diagram of the internal structure of the digital torque wrench with the fixed force reducing gear set disposed between the unidirectional force reducing gear set and the dog;
FIG. 8 is a schematic diagram of the internal structure of the digital torque wrench with the fixed force reducing gear set disposed between the unidirectional force reducing gear set and the arcuate rack;
FIG. 9 is a schematic diagram of the internal structure of a digital torque wrench with a unidirectional force reducing gear set disposed between two adjacent fixed force reducing gear sets;
marked in the figure as: 1. a force application handle; 2. a first shaft; 3. an arc-shaped rack; 4. a first input gear; 5. a first output gear; 6. a fifth input gear; 7. a fifth output gear; 8. a first gear; 9. a second gear; 10. a one-way device; 11. a return spring; 12. an actuator; 13. a stop tooth; 14. a locking claw; 15. a second shaft; 16. a third shaft; 17. a housing; 18. a spanner head; 19. a handle; 20. a force unloading mechanism; 21. an electronic box; 22. a fourth shaft; 23. a second input gear; 24. a fifth shaft; 25. a sixth shaft; 26. a second output gear; 27. a third input gear; 28. a third output gear; 29. a fourth input gear; 30. a fourth output gear; 31. an input gear; 32. an output gear.
Detailed Description
The following detailed description of the embodiments of the invention, given by way of example only, is presented in the accompanying drawings to aid in a more complete, accurate and thorough understanding of the concepts and aspects of the invention, and to aid in its practice, by those skilled in the art.
As shown in fig. 1 to 5, the present invention provides an electronic force limiting method of a digital torque wrench, by providing a force reducing mechanism in a housing 17 connected to a wrench body, providing an arc-shaped rack 3 engaged with an input end of the force reducing mechanism on a rotatable force applying handle 1, and providing a locking claw 14 for locking an output end of the force reducing mechanism, when a tightening torque reaches a preset value, a locking tooth 13 on the locking claw 14 is disengaged from the output end of the force reducing mechanism, and an operating force applied to the force applying handle 1 is transmitted to the input end of the force reducing mechanism through the arc-shaped rack 3, so that the force reducing mechanism can freely rotate to remove the operating force applied to the force applying handle 1.
Specifically, as shown in fig. 1 to 3, the wrench body is used for screwing the fastener, the wrench body is composed of a wrench head 18 and a handle 19, the wrench head 18 is fixedly connected with one end of the handle 19 in the length direction, one end of the housing 17 in the length direction is fixedly connected with the other end of the handle 19 in the length direction, the arc-shaped rack 3 is rotatably connected with the other end of the housing 17 in the length direction, the force application handle 1 is fixedly connected with the arc-shaped rack 3, the force application handle 1 is located outside the housing 17, and the force application handle 1 and the handle 19 are used for being held by an operator. The handle 19 is of a hollow tubular structure, a torque sensor is arranged in the handle 19, an electronic processing device and a display device are arranged in the electronic box 21, and the torque sensor and the display device are electrically connected with the electronic processing device; the electronic cassette 21 is fixedly provided on the housing 17, and the torque sensor is used for transmitting the detected tightening torque to the electronic processing device, and the display device is used for displaying the tightening torque value. In the process of tightening, when the tightening torque reaches a preset value, the electronic processing device electrifies the actuator 12, and the force reducing mechanism starts to work, so that the force applied on the force application handle 1 is invalid, thereby achieving the purpose of limiting the torque. The wrench body, the housing 17, the electronic box 21, the force application handle 1 and the internal components of the housing 17 form a digital display torque wrench.
As shown in fig. 1 to 3, the housing 17 is of a hollow structure in the interior, and the force reducing mechanism plays a role in reducing force, and the force reducing mechanism, the locking pawl 14 and the arc-shaped rack 3 are located in the inner cavity of the housing 17. The arc-shaped rack 3 is arranged in the shell 17 through the first shaft 2, the arc-shaped rack 3 is fixedly connected with the force application handle 1 through a pin or a screw, and the arc-shaped rack 3 and the force application handle 1 can integrally rotate around the first shaft 2. The locking claw 14 is rotationally connected with the shell 17 through a third shaft 16, and an actuator 12 for controlling the locking claw 14 to rotate is arranged in the shell 17; the rotation of the locking pawl 14 is controlled by the actuator 12 such that the locking tooth 13 can be selectively engaged and disengaged with the output of the fixed reduction mechanism. The stop tooth 13 is provided with one, the stop tooth 13 is fixedly connected with the stop claw 14, the stop tooth 13 extends towards the outer side of the stop claw 14, and after the stop tooth 13 is embedded into a tooth groove of the output end of the reducing mechanism, the stop tooth 13 plays a limiting role on the output end of the reducing mechanism and can prevent the output end of the reducing mechanism from rotating. After the stop tooth 13 is disengaged from the tooth socket of the output end of the reduction mechanism, the output end of the reduction mechanism can be rotated. The stop tooth 13 is provided with one, the stop tooth 13 is fixedly connected with the stop pawl 14, and the stop tooth 13 extends towards the outer side of the stop pawl 14.
The actuator 12 is fixedly arranged in the shell 17, the actuator 12 is electrically connected with the electronic processing device, and the electronic processing device supplies power to the actuator 12 to control the actuator 12 to perform corresponding actions. The actuator 12 may be a motor, the actuator 12 may be an electromagnet, and the pawl 14 may be connected to an armature of the electromagnet. In this embodiment, as shown in fig. 1 and 4, the actuator 12 is an electromagnet, and an armature of the electromagnet is connected to the locking claw 14, and moves along an axial line to drive the locking claw 14 to rotate.
As shown in fig. 1, a return spring 11 applying elastic force to the arc-shaped rack 3 is arranged in the housing 17, the return spring 11 is a cylindrical spiral spring and is a compression spring, the return spring 11 is clamped between the arc-shaped rack 3 and the inner wall surface of the housing 17, and the elastic force applied to the arc-shaped rack 3 by the return spring 11 enables the arc-shaped rack 3 to rotate. The return spring 11 is used for realizing the rotary return of the arc-shaped rack 3, the force application handle 1 and the force reducing mechanism, and is ready for the next screwing operation.
As shown in fig. 1 to 3 and 6, the force reducing mechanism comprises a unidirectional force reducing gear set, the unidirectional force reducing gear set comprises a second shaft 15, a first gear 8 meshed with the arc-shaped rack 3, a second gear 9 and a one-way device 10 arranged on the second shaft 15, the first gear 8, the second gear 9 and the second shaft 15 are coaxially arranged, the first shaft 2, the second shaft 15 and a third shaft 16 are arranged on a shell 17, the axis of the second shaft 15 is parallel to the axis of the first shaft 2 and the axis of the third shaft 16, the one-way device 10 is arranged between the first gear 8 and the second shaft 15 or between the second gear 9 and the second shaft 15, the first gear 8 is used as an input end of the force reducing mechanism, the second gear 9 is used as an output end of the force reducing mechanism, the second gear 9 is provided with tooth grooves for embedding stop teeth 13, the first gear 8 and the second gear 9 are cylindrical gears, and the diameter of the first gear 8 is smaller than that of the second gear 9; when the tightening operation is performed, the first gear 8, the second gear 9 and the second shaft 15 synchronously rotate, and the unidirectional force reducing gear set transmits the torque from the arc-shaped rack 3 to the stop pawl 14; in the arcuate rack resetting direction, the isolator 10 slips off and cannot transmit torque, and the second gear 9 does not rotate with the first gear 8. After the stop tooth 13 is embedded into one tooth slot of the second gear 9, the stop tooth 13 plays a limiting role on the second gear 9, so that the second gear 9 can be prevented from rotating. After the stop tooth 13 is disengaged from one of the tooth grooves of the second gear 9, the second gear 9 can be rotated.
The isolator 10 has two states in terms of steering: a locked state and a rotated state; in the tightening process of the fastener, the inner ring and the outer ring of the isolator 10 cannot rotate relatively, in this state, the first gear 8 and the second gear 9 are fixed circumferentially with the second shaft 15, the first gear 8 drives the second gear 9 to rotate synchronously around the axis through the second shaft 15, and the second gear 9 transmits torque to the fixed force reducing gear set or the stop pawl 14. During the resetting of the arc-shaped rack, the inner ring and the outer ring of the isolator 10 can rotate relatively, the first gear 8 and the second gear 9 can rotate relatively, and the second gear 9 can not transmit torque to the fixed force reducing gear set or the locking claw 14. When the first gear 8 and the second gear 9 cannot rotate relatively, the locking claw 14 is embedded into a tooth groove at the output end of the reducing mechanism, so that all gears of the reducing mechanism cannot rotate, and the force application handle 1 can be fixed through the reducing mechanism, so that the force application handle 1 cannot rotate, and the screwing operation can be ensured to be completed.
As shown in fig. 6, in the electronic force limiting method of the digital torque wrench, as the force reducing mechanism is provided with only one unidirectional force reducing gear set, when the tightening operation of the fastener is performed, an operator applies an operating force to the force applying handle 1, the force applying handle 1 and the arc-shaped rack 3 have a tendency to rotate along a first direction, and as the isolator 10 is in a locking state, the arc-shaped rack 3 has a tendency to drive the whole force reducing mechanism to rotate, and as the actuator 12 is not electrified, the stop pawl 14 is under the action of the actuator 12, the stop teeth 13 on the stop pawl 14 are embedded in the tooth grooves of the second gear 9, the force reducing mechanism cannot rotate, so that the force applying handle 1 and the arc-shaped rack 3 cannot rotate around the first shaft 2, and the operating force applied to the force applying handle 1 drives the housing 17 to rotate through the rotation of the first shaft 2, so that the whole digital torque wrench rotates, and performs the tightening operation. When the tightening torque reaches a preset value, the electronic processing device sends a signal to the actuator 12, the actuator 12 is started, the actuator 12 drives the locking claw 14 to rotate along the second direction, the locking claw 14 rotates towards a position far away from the second gear 9, the locking tooth 13 is separated from the second gear 9, each gear of the force reducing mechanism can rotate freely, the force application handle 1 and the arc-shaped rack 3 drive each gear of the force reducing mechanism to rotate, and meanwhile the force application handle 1 and the arc-shaped rack 3 continue to rotate along the first direction, so that the force applied to the force application handle 1 is removed, and the purpose of accurately controlling the torque is achieved.
When the tightening operation of the fastener is stopped, after the operating force acting on the force application handle 1 disappears, the arc-shaped rack 3 drives the force application handle 1 to rotate around the second direction under the action of the reset spring 11, and the arc-shaped rack 3 and the force application handle 1 can be automatically reset due to the fact that the isolator 10 is in a rotating state, and the wrench can perform the next tightening operation. The first direction and the second direction are opposite directions, and if the first direction is a counterclockwise direction, the second direction is a clockwise direction.
As shown in fig. 1 to 3, as a modified embodiment, the force reducing mechanism includes a one-way force reducing gear set and a fixed force reducing gear set, the fixed force reducing gear set being provided with at least 1 set. The unidirectional force reducing gear set is used for unidirectional torque transmission between the arc-shaped rack 3 and the fixed force reducing gear set, and at the moment, the unidirectional force reducing gear set is arranged between the arc-shaped rack 3 and the fixed force reducing gear set, and the unidirectional force reducing gear set can only transmit torque from the arc-shaped rack 3 to the fixed force reducing gear set. Alternatively, a one-way force reducing gear set is used to transfer torque unidirectionally between the fixed force reducing gear set and the dogs 14, with the one-way force reducing gear set disposed between the dogs 14 and the fixed force reducing gear set, the one-way force reducing gear set being capable of transferring torque only from the fixed force reducing gear set to the dogs 14. Or, the unidirectional force reducing gear set is used for unidirectional torque transmission between two adjacent fixed force reducing gear sets, and the unidirectional force reducing gear set is arranged between the two adjacent fixed force reducing gear sets, so that the unidirectional force reducing gear set can only transmit the torque from one fixed force reducing gear set to the other fixed force reducing gear set.
As shown in fig. 7, when the fixed force reducing gear set is disposed between the unidirectional force reducing gear set and the stop dog 14, the unidirectional force reducing gear set is disposed between the arc-shaped rack 3 and the fixed force reducing gear set, the unidirectional force reducing gear set includes a second shaft 15, a first gear 8, a second gear 9, and an isolator 10 disposed on the second shaft 15, the isolator 10 is disposed between the first gear 8 and the second shaft 15, or the isolator 10 is disposed between the second gear 9 and the second shaft 15, the diameter of the first gear 8 is smaller than the diameter of the second gear 9, the first gear 8 serves as an input end of the force reducing mechanism, and the fixed force reducing gear set has tooth grooves into which the stop teeth 13 are embedded. The first gear 8 and the second gear 9 are cylindrical gears, and the diameter of the first gear 8 is smaller than the diameter of the second gear 9. When the tightening operation is performed, the first gear 8, the second gear 9 and the second shaft 15 synchronously rotate, and the torque from the arc-shaped rack 3 is sequentially transmitted to the locking claw 14 through the unidirectional force reducing gear set and the fixed force reducing gear set; in the arcuate rack resetting direction, the isolator 10 slips off and cannot transmit torque, and the second gear 9 does not rotate with the first gear 8. After the stop tooth 13 is embedded into one tooth slot of the second gear 9, the stop tooth 13 plays a limiting role on the second gear 9, so that the second gear 9 can be prevented from rotating. After the stop tooth 13 is disengaged from one of the tooth grooves of the second gear 9, the second gear 9 can be rotated.
As shown in fig. 7, when the fixed force reducing gear train is disposed between the one-way force reducing gear train and the holding pawl 14 and the fixed force reducing gear train is disposed as a group, the fixed force reducing gear train is composed of one input gear 31 and one output gear 32, the diameter of the input gear 31 is smaller than that of the output gear 32, the input gear 31 is engaged with the second gear 9, and the output gear 32 has tooth grooves into which the holding teeth 13 are fitted. The input gear 31 and the output gear 32 are mounted in the housing 17 via the sixth shaft 25, the input gear 31 and the output gear 32 being rotatable synchronously about the sixth shaft 25, the axis of the sixth shaft 25 being parallel to the axis of the first shaft 2. The rotation of the pawl 14 is controlled by the actuator 12 such that the pawl teeth 13 can be selectively engaged and disengaged with the output gear 32. The stop tooth 13 is provided with one, the stop tooth 13 is fixedly connected with the stop claw 14, the stop tooth 13 extends towards the outer side of the stop claw 14, and after the stop tooth 13 is embedded into one tooth groove of the output gear 32, the stop tooth 13 plays a limiting role on the output gear 32 and can prevent the output gear 32 from rotating. After the stop tooth 13 is disengaged from one of the tooth grooves of the output gear 32, the output gear 32 can be rotated.
When the fixed force reducing gear sets are arranged between the unidirectional force reducing gear sets and the locking pawls 14, and the fixed force reducing gear sets are arranged in a plurality of groups, each fixed force reducing gear set is composed of an input gear and an output gear, the input gear and the output gear of each fixed force reducing gear set synchronously rotate, the diameter of the input gear is smaller than that of the output gear, the second gear 9 is used as an input end of the force reducing mechanism, the input gear is meshed with the second gear 9, the output gear at the tail end of the torque transmission line is provided with tooth grooves for embedding locking teeth 13, and the output gear at the tail end of the torque transmission line is used as an output end of the force reducing mechanism and is matched with the locking teeth 13. For two fixed reduction gear sets adjacent in torque transmission path, the output gear of one fixed reduction gear set meshes with the input gear of the other fixed reduction gear set. The rotation of the pawl 14 is controlled by the actuator 12 such that the pawl tooth 13 can be selectively engaged and disengaged with the mating output gear. The stop tooth 13 is provided with one, the stop tooth 13 is fixedly connected with the stop claw 14, the stop tooth 13 extends towards the outer side of the stop claw 14, and after the stop tooth 13 is embedded into one tooth groove of the matched output gear, the stop tooth 13 plays a limiting role on the output gear and can prevent the output gear from rotating. After the stop tooth 13 is disengaged from one of the tooth grooves of the output gear, the output gear can be rotated.
As shown in fig. 8, a fixed force reducing gear set is arranged between a unidirectional force reducing gear set and an arc-shaped rack 3, the unidirectional force reducing gear set is arranged between a stop dog 14 and the fixed force reducing gear set, the unidirectional force reducing gear set comprises a second shaft 15, a first gear 8, a second gear 9 and an isolator 10 arranged on the second shaft 15, the isolator 10 is arranged between the first gear 8 and the second shaft 15 or between the second gear 9 and the second shaft 15, the diameter of the first gear 8 is smaller than that of the second gear 9, and the second gear 9 is provided with tooth grooves for embedding the stop teeth 13; when the tightening operation is performed, the first gear 8, the second gear 9 and the second shaft 15 synchronously rotate, and the torque from the arc-shaped rack 3 is sequentially transmitted to the locking claw 14 through the fixed force reducing gear set and the one-way force reducing gear set; in the arcuate rack resetting direction, the isolator 10 slips off and cannot transmit torque, and the second gear 9 does not rotate with the first gear 8.
As shown in fig. 8, when the fixed force reducing gear set is disposed between the unidirectional force reducing gear set and the arc-shaped rack 3, and the fixed force reducing gear set is disposed as a group, the fixed force reducing gear set is composed of an input gear 31 and an output gear 32, the input gear 31 and the output gear 32 are synchronously rotated, the diameter of the input gear 31 is smaller than that of the output gear 32, the input gear 31 is meshed with the arc-shaped rack 3, the output gear 32 is meshed with the first gear 8, the input gear 31 is used as an input end of the force reducing mechanism, the second gear 9 is used as an output end of the force reducing mechanism, the input gear 31 and the output gear 32 are mounted in the housing 17 through the fourth shaft 22, the input gear 31 and the output gear 32 can synchronously rotate around the fourth shaft 22, and the axis of the fourth shaft 22 is parallel to the axis of the first shaft 2. The rotation of the pawl 14 is controlled by the actuator 12 such that the pawl tooth 13 can be selectively engaged with and disengaged from the second gear 9. The stop tooth 13 is provided with one, the stop tooth 13 is fixedly connected with the stop claw 14, the stop tooth 13 extends towards the outer side of the stop claw 14, and after the stop tooth 13 is embedded into one tooth groove of the second gear 9, the stop tooth 13 plays a limiting role on the second gear 9, so that the second gear 9 can be prevented from rotating. After the stop tooth 13 is disengaged from one of the tooth grooves of the second gear 9, the second gear 9 can be rotated.
When the fixed force reducing gear sets are arranged between the unidirectional force reducing gear sets and the arc-shaped racks 3, and the fixed force reducing gear sets are arranged in a plurality of groups, each fixed force reducing gear set is composed of an input gear and an output gear, the diameter of the input gear is smaller than that of the output gear, the input gear positioned at the forefront end of the torque transmission route is used as the input end of the force reducing mechanism, the input gear is meshed with the arc-shaped racks 3, and the output gear positioned at the forefront end of the torque transmission route is meshed with the first gear 8. For two fixed reduction gear sets adjacent in torque transmission path, the output gear of one fixed reduction gear set meshes with the input gear of the other fixed reduction gear set.
As shown in fig. 1 to 3 and 9, as a modified embodiment, a plurality of sets of fixed force reducing gear sets may be provided, one-way force reducing gear sets are arranged between two adjacent fixed force reducing gear sets, each fixed force reducing gear set is composed of one input gear and one output gear, the diameter of the input gear is smaller than that of the output gear, the input gear located at the forefront end on the torque transmission path is used as the input end of the force reducing mechanism, the input gear is meshed with the arc-shaped rack 3, the output gear located at the forefront end on the torque transmission path is used as the output end of the force reducing mechanism, the output gear has tooth grooves for embedding the stop teeth 13, the first gear 8 is meshed with the output gear of one of the fixed force reducing gear sets, the second gear 9 is meshed with the input gear of the other fixed force reducing gear set, and thus one-way transmission of torque between the two adjacent fixed force reducing gear sets can be realized.
As shown in fig. 1 to 5, in the present embodiment, the fixed force reducing gear sets may be provided with five sets, which are a first fixed force reducing gear set, a second fixed force reducing gear set, a third fixed force reducing gear set, a fourth fixed force reducing gear set, and a fifth fixed force reducing gear set, respectively. The first fixed force reducing gear set comprises a first input gear 4 and a first output gear 5, the first input gear 4 and the first output gear 5 synchronously rotate, the diameter of the first input gear 4 is smaller than that of the first output gear 5, and the first input gear 4 is meshed with the arc-shaped rack 3. The first input gear 4 and the first output gear 5 are cylindrical gears, the axes of the first input gear 4 and the first output gear 5 are perpendicular to the length direction of the shell 17, the first input gear 4 and the first output gear 5 are installed in the shell 17 through the fourth shaft 22, and the first input gear 4 and the first output gear 5 can synchronously rotate around the fourth shaft 22. One end of the arc-shaped rack 3 is provided with a tooth socket for embedding the gear teeth of the first input gear 4, the other end of the arc-shaped rack 3 is fixedly connected with the force application handle 1, and a shaft hole for allowing the first shaft 2 to pass through is arranged at a position between two ends of the arc-shaped rack 3. When the arc-shaped rack 3 rotates, the first input gear 4 is driven to rotate, the first output gear 5 and the first input gear 4 synchronously rotate, and the first output gear 5 transmits torque to the unidirectional force-reducing transmission gear set. The first input gear 4 serves as an input end of the force reducing mechanism, the unidirectional force reducing gear set is located between the first fixed force reducing gear set and the second fixed force reducing gear set, and the first output gear 5 is meshed with the first gear 8.
The second fixed force reducing gear set comprises a second input gear 23 and a second output gear 26, the diameter of the second input gear 23 is smaller than that of the second output gear 26, the second input gear 23 and the second output gear 26 are cylindrical gears, the axes of the second input gear 23 and the second output gear 26 are perpendicular to the length direction of the shell 17, the second input gear 23 and the second output gear 26 are installed in the shell 17 through a fifth shaft 24, the second input gear 23 and the second output gear 26 can synchronously rotate around the fifth shaft 24, and the axis of the fifth shaft 24 is parallel to the axis of the first shaft 2 and the axis of the fourth shaft 22. The second input gear 23 meshes with the second gear 9. The third fixed force reducing gear set comprises a third input gear 27 and a third output gear 28, the diameter of the third input gear 27 is smaller than that of the third output gear 28, the third input gear 27 and the third output gear 28 are cylindrical gears, the axes of the third input gear 27 and the third output gear 28 are perpendicular to the length direction of the shell 17, the third input gear 27 and the third output gear 28 are arranged in the shell 17 through a sixth shaft 25, the third input gear 27 and the third output gear 28 can synchronously rotate around the sixth shaft 25, the third input gear 27 is meshed with the second output gear 26, and the diameter of the third input gear 27 is smaller than that of the second output gear 26. The fourth fixed force reducing gear set comprises a fourth input gear 29 and a fourth output gear 30, the diameter of the fourth input gear 29 is smaller than that of the fourth output gear 30, the fourth input gear 29 and the fourth output gear 30 are cylindrical gears, the axes of the fourth input gear 29 and the fourth output gear 30 are perpendicular to the length direction of the shell 17, the fourth input gear 29 and the fourth output gear 30 are installed in the shell 17 through a fifth shaft 24, the fourth input gear 29 and the fourth output gear 30 can synchronously rotate around the fifth shaft 24, the fourth input gear 29 is meshed with the third output gear 28, the diameter of the fourth input gear 29 is smaller than that of the third output gear 28, and the fourth output gear 30 is meshed with the fifth input gear 6. The fifth fixed force reducing gear set comprises a fifth input gear 6 and a fifth output gear 7, the diameter of the fifth input gear 6 is smaller than that of the fifth output gear 7, the fifth output gear 7 is used as an output end of the force reducing mechanism, and the fifth output gear 7 is provided with tooth grooves for embedding the stop teeth 13. The fifth input gear 6 and the fifth output gear 7 are cylindrical gears, the axes of the fifth input gear 6 and the fifth output gear 7 are perpendicular to the length direction of the shell 17, the fifth input gear 6 and the fifth output gear 7 are installed in the shell 17 through a sixth shaft 25, the fifth input gear 6 and the fifth output gear 7 can synchronously rotate around the sixth shaft 25, the axis of the sixth shaft 25 is parallel to the axis of the first shaft 2 and the axis of the fourth shaft 22, the fifth input gear 6 is meshed with the fourth output gear 30, and the diameter of the fifth input gear 6 is smaller than that of the fourth output gear 30. After the stop tooth 13 is embedded into one tooth slot of the fifth output gear 7, the stop tooth 13 plays a limiting role on the fifth output gear 7, so that the fifth output gear 7 can be prevented from rotating. After the stop tooth 13 is disengaged from one of the tooth grooves of the fifth output gear 7, the fifth output gear 7 can be rotated.
The isolator 10 is arranged between the second gear 9 and the second shaft 15, the first gear 8 is arranged in the shell 17 through the second shaft 15, the first gear 8 is fixedly connected with the second shaft 15, the axis of the second shaft 15 is parallel to the axis of the first shaft 2, the first gear 8 is meshed with the first output gear 5, the diameter of the first output gear 5 is larger than that of the first gear 8, the second gear 9 is meshed with the second input gear 23, and the diameter of the second input gear 23 is smaller than that of the second gear 9. When the tightening operation is performed, the first gear 8, the second gear 9 and the second shaft 15 rotate synchronously, and the unidirectional force reducing transmission gear set transmits the torque from the arc-shaped rack 3 to the second fixed force reducing gear set. The isolator 10 is connected to the second shaft 15 and the second gear 9, the isolator 10 is a one-way bearing or a ratchet mechanism, and the structures of the one-way bearing and the ratchet mechanism are as known to those skilled in the art, and are not described herein, the outer ring of the isolator 10 is fixedly connected to the second gear 9, and the inner ring of the isolator 10 is fixedly connected to the second shaft 15.
In the electronic force limiting method of the digital torque wrench, when the tightening operation of the fastener is performed, an operator applies an operating force to the force application handle 1, the force application handle 1 and the arc-shaped rack 3 have a tendency to rotate along a first direction, the arc-shaped rack 3 has a tendency to drive the whole torque reducing mechanism to rotate due to the fact that the isolator 10 is in a locking state, the locking claw 14 is embedded into a tooth socket at the output end of the torque reducing mechanism due to the fact that the actuator 12 is not electrified, the torque reducing mechanism cannot rotate under the action of the actuator 12, the force application handle 1 and the arc-shaped rack 3 cannot rotate around the first shaft 2, and the operating force applied to the force application handle 1 drives the shell 17 to rotate through the rotation of the first shaft 2, so that the whole digital torque wrench rotates to perform the tightening operation.
When the tightening torque reaches a preset value, the electronic processing device energizes the actuator 12, the actuator 12 is started, the actuator 12 drives the locking claw 14 to rotate along the second direction, the locking claw 14 rotates towards a position far away from the fifth output gear 7, the locking tooth 13 is separated from the output end of the force reducing mechanism, all gears of the force reducing mechanism can rotate freely, the force application handle 1 and the arc-shaped rack 3 drive all gears of the force reducing mechanism to rotate, and meanwhile the force application handle 1 and the arc-shaped rack 3 continue to rotate along the first direction, so that the force applied to the force application handle 1 is removed, and the purpose of accurately controlling the torque is achieved.
When the tightening operation of the fastener is stopped, after the operating force acting on the force application handle 1 disappears, the arc-shaped rack 3 drives the force application handle 1 to rotate around the second direction under the action of the reset spring 11, and the arc-shaped rack 3 and the force application handle 1 can be automatically reset due to the fact that the isolator 10 is in a rotating state, and the wrench can perform the next tightening operation. The first direction and the second direction are opposite directions, and if the first direction is a counterclockwise direction, the second direction is a clockwise direction.
The electronic force limiting method of the digital display torque wrench has the following advantages:
1. the force reducing gear set can be locked on the final stage gear by using small force through the force reducing mechanism, the force applying handle 1 is fixed to finish the screwing operation, and the actuator 12 can drive the braking claw to be separated from the locking position by using small force, so that the screwing force is invalid due to the rotation of the force reducing gear set;
2. using a one-way bearing (or one-way ratchet) structure, when the one-way bearing is in a locking state, the force reducing mechanism and the force application handle 1 are fixed, and the screwing operation is completed; during resetting, the unidirectional bearing can rotate freely, the resetting force of the handle and the arc-shaped rack 3 is reduced, and the handle is reset rapidly under the action of small spring force.
The invention is described above by way of example with reference to the accompanying drawings. It will be clear that the invention is not limited to the embodiments described above. As long as various insubstantial improvements are made using the method concepts and technical solutions of the present invention; or the invention is not improved, and the conception and the technical scheme are directly applied to other occasions and are all within the protection scope of the invention.
Claims (9)
1. The digital display torque wrench comprises a wrench body and a shell connected with the wrench body, and is characterized by further comprising a force reducing mechanism arranged in the shell, a force application handle which is rotatably arranged, an arc-shaped rack which is arranged on the force application handle and is meshed with the input end of the force reducing mechanism, and a stop dog which is used for locking the output end of the force reducing mechanism;
the locking claw is rotationally connected with the shell through a third shaft, and an actuator for controlling the locking claw to rotate is arranged in the shell; the rotation of the pawl is controlled by an actuator such that the pawl teeth on the pawl can be selectively engaged and disengaged with the output of the reduction mechanism.
2. The digital torque wrench of claim 1, wherein the arcuate rack is mounted in the housing via a first shaft, the force reducing mechanism comprises a unidirectional force reducing gear set comprising a second shaft, a first gear meshed with the arcuate rack, a second gear, and a one-way clutch disposed on the second shaft, the one-way clutch disposed between the first gear and the second shaft or between the second gear and the second shaft, the second gear having a tooth slot into which the stop tooth is embedded, the first gear having a diameter smaller than the second gear; when the tightening operation is carried out, the first gear, the second gear and the second shaft synchronously rotate, and the unidirectional force reducing gear set transmits the torque from the arc-shaped rack to the locking claw; in the reset direction of the arc-shaped rack, the isolator slips and cannot transmit torque, the second gear does not rotate along with the first gear, and the force application handle is rotated to reset.
3. The digital torque wrench of claim 1, wherein the arcuate rack is mounted in the housing via a first shaft, the reduction mechanism includes a unidirectional reduction gear set and a fixed reduction gear set, the fixed reduction gear set providing at least 1 set, the unidirectional reduction gear set being configured to unidirectionally transfer torque between the arcuate rack and the fixed reduction gear set, or the unidirectional reduction gear set being configured to unidirectionally transfer torque between the fixed reduction gear set and the dog, or the unidirectional reduction gear set being configured to unidirectionally transfer torque between two adjacent fixed reduction gear sets.
4. The digital torque wrench of claim 3, wherein the fixed force reducing gear set is disposed between the unidirectional force reducing gear set and the dog, the unidirectional force reducing gear set comprises a second shaft, a first gear, a second gear, and a one-way clutch disposed on the second shaft, the one-way clutch is disposed between the first gear and the second shaft or between the second gear and the second shaft, the diameter of the first gear is smaller than the diameter of the second gear, and the fixed force reducing gear set has tooth slots for the dog teeth to embed; when the tightening operation is carried out, the first gear, the second gear and the second shaft synchronously rotate, and the torque from the arc-shaped rack is sequentially transmitted to the stop dog through the unidirectional force reducing gear set and the fixed force reducing gear set; in the reset direction of the arc-shaped rack, the isolator slips and cannot transmit torque, and the second gear does not rotate along with the first gear.
5. The digital torque wrench of claim 4, wherein the fixed force reducing gear set is a set, the fixed force reducing gear set is composed of an input gear and an output gear, the diameter of the input gear is smaller than that of the output gear, the input gear is meshed with the second gear, and the output gear is provided with tooth grooves for embedding the stop teeth; or the fixed force reducing gear sets are arranged in a plurality of groups, each fixed force reducing gear set consists of an input gear and an output gear, the diameter of the input gear is smaller than that of the output gear, the second gear is used as an input end of the force reducing mechanism, the input gear is meshed with the second gear, the output gear at the tail end on the torque transmission route is provided with a tooth slot for embedding a stop tooth, the output gear is used as an output end of the force reducing mechanism, and for two adjacent fixed force reducing gear sets on the torque transmission route, the output gear of one fixed force reducing gear set is meshed with the input gear of the other fixed force reducing gear set.
6. The digital torque wrench of claim 3, wherein the fixed force reducing gear set is disposed between the unidirectional force reducing gear set and the arcuate rack, the unidirectional force reducing gear set comprises a second shaft, a first gear, a second gear, and a one-way clutch disposed on the second shaft, the one-way clutch disposed between the first gear and the second shaft or between the second gear and the second shaft, the diameter of the first gear is smaller than the diameter of the second gear, the second gear has a tooth slot into which the stop tooth is inserted; when the tightening operation is carried out, the first gear, the second gear and the second shaft synchronously rotate, and the torque from the arc-shaped rack is sequentially transmitted to the stop dog through the fixed force reducing gear set and the unidirectional force reducing gear set; in the reset direction of the arc-shaped rack, the isolator slips and cannot transmit torque, and the second gear does not rotate along with the first gear.
7. The digital display torque wrench of claim 6, wherein the fixed force reducing gear set is a set, the fixed force reducing gear set is composed of an input gear and an output gear, the diameter of the input gear is smaller than that of the output gear, the input gear is meshed with the arc-shaped rack, and the output gear is meshed with the first gear; or the fixed force reducing gear sets are arranged in a plurality of groups, each fixed force reducing gear set consists of an input gear and an output gear, the diameter of the input gear is smaller than that of the output gear, the input gear serving as the input end of the force reducing mechanism is meshed with the arc-shaped rack, the output gear positioned at the tail end on the torque transmission route is meshed with the first gear, and for two adjacent fixed force reducing gear sets on the torque transmission route, the output gear of one fixed force reducing gear set is meshed with the input gear of the other fixed force reducing gear set.
8. A digital torque wrench as claimed in claim 3, wherein the fixed force reducing gear sets are provided in plural groups, the unidirectional force reducing gear sets are arranged between two adjacent fixed force reducing gear sets, each fixed force reducing gear set is composed of an input gear and an output gear, the diameter of the input gear is smaller than that of the output gear, the input gear as the input end of the force reducing mechanism is meshed with the arc-shaped rack, the output gear at the end of the torque transmission path is provided with tooth grooves for embedding the stop teeth, the first gear is meshed with one output gear, and the second gear is meshed with one input gear.
9. The digital torque wrench of any one of claims 1-8, wherein a return spring is disposed within the housing for applying an elastic force to the arcuate rack.
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| CN202210883023.6A CN115106970B (en) | 2021-01-27 | 2021-01-27 | Digital display torque wrench |
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| CN202110112601.1A CN112917426B (en) | 2021-01-27 | 2021-01-27 | Electronic force limiting method of digital display torque wrench |
| CN202210883023.6A CN115106970B (en) | 2021-01-27 | 2021-01-27 | Digital display torque wrench |
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| CN202110112601.1A Division CN112917426B (en) | 2021-01-27 | 2021-01-27 | Electronic force limiting method of digital display torque wrench |
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| DE3808120A1 (en) * | 1988-03-11 | 1989-09-28 | Wille Gmbh & Co | TORQUE WRENCH |
| DE29501355U1 (en) * | 1995-01-28 | 1995-03-02 | Hazet-Werk Hermann Zerver Gmbh & Co Kg, 42857 Remscheid | Torque wrench |
| DE102006054190A1 (en) * | 2006-11-16 | 2008-05-21 | Robert Bosch Gmbh | ratchet tool |
| CN103909492B (en) * | 2012-12-29 | 2016-03-09 | 南京德朔实业有限公司 | Electric wrench |
| CN103203709B (en) * | 2013-04-18 | 2015-06-10 | 重庆鼎誉机电有限公司 | Hydraulic wrench |
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| CN2176299Y (en) * | 1993-05-11 | 1994-09-07 | 钟华庆 | Electronic lorque display of spanner |
| CN2493358Y (en) * | 2001-08-24 | 2002-05-29 | 清华大学 | Torque set wrench wirh right torque signal sampling and feedback |
| CN1640625A (en) * | 2004-01-16 | 2005-07-20 | 金统立工业股份有限公司 | Torque wrench capable of counting and displaying |
| JP2011206872A (en) * | 2010-03-29 | 2011-10-20 | Tohnichi Mfg Co Ltd | Semi-automatic torque wrench |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN112917426B (en) | 2022-09-06 |
| CN112917426A (en) | 2021-06-08 |
| CN115106970A (en) | 2022-09-27 |
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