Compact lithium battery torque wrench

Abstract

The application discloses a compact lithium battery torque wrench, relates to the field of wrenches, and comprises a shell, a motor and a transmission mechanism arranged in the shell, and an output shaft for outputting torque. In the application, the steel ball is separated from the recess of the inner gear ring at the moment when the counterforce arm is pushed open, the locking of the fifth and sixth level inner gear rings is released, at this time, the fifth and sixth level inner gear rings start to idle, the fifth and sixth level planetary gear system loses the function of speed reduction, the power is cut off at this level, the output shaft is instantaneously stopped or greatly reduced in speed, meanwhile, the internal mechanism hits the shell, a clear 'click' sound is generated, and the user is informed that the torque has reached. The counterforce arm clamping spring and the fifth and sixth level inner gear ring clamping spring are used for fixing the positions of the related parts and preventing them from being separated, the lithium battery torque wrench structure of the device is compact, the overall weight of the existing lithium battery torque wrench can be reduced, and thus the staff can be prevented from suffering from soreness and fatigue of the hands in a short time.

Description

Technical Field

[0001] This application relates to the field of wrenches, and more particularly to a compact lithium-ion torque wrench. Background Technology

[0002] Lithium-ion battery torque wrenches are power tools used to precisely control the tightening torque of bolts. Combining lithium battery power and torque setting function, they are suitable for high-precision tightening scenarios.

[0003] Since electric torque wrenches are used handheld, prolonged handheld operation can easily cause hand pain and fatigue for workers. It is necessary to minimize the internal structure and reduce unnecessary weight, while not discarding essential mechanical transmission components. Therefore, there is a need for a lightweight, compact lithium-ion torque wrench that does not affect normal use. Utility Model Content

[0004] In order to reduce the overall weight of existing lithium-ion torque wrenches, this application provides a compact lithium-ion torque wrench.

[0005] The compact lithium-ion torque wrench provided in this application adopts the following technical solution: A compact lithium-ion torque wrench includes a housing, a motor and a transmission mechanism disposed in the housing, and an output shaft for outputting torque. The transmission mechanism is a multi-stage planetary gear reduction mechanism, which includes at least a three-stage, four-stage, five-stage and six-stage planetary gear system that are driven sequentially.

[0006] The transmission mechanism includes a connecting plate, a high-speed flange, a reaction arm, a steel ball, a compression spring, a fifth and sixth level internal gear ring bushing, a large gear ring, and a first level gear ring. The steel ball is installed in conjunction with the reaction arm under the action of the compression spring, and the reaction arm is provided with a reaction arm retainer.

[0007] The transmission mechanism also includes a three-stage gear carrier assembly, a two-stage gear carrier assembly, a one-stage gear carrier assembly, a five-stage gear carrier assembly, and a four-stage gear carrier assembly. The three-stage gear carrier assembly, the two-stage gear carrier assembly, the one-stage gear carrier assembly, the five-stage gear carrier assembly, and the four-stage gear carrier assembly are connected in sequence to transmit power. The three-stage sun gear is one of the input ends of the transmission mechanism. The five-stage and six-stage internal gear ring bushings are respectively provided with five-stage and six-stage internal gear ring washers and five-stage and six-stage internal gear ring retaining rings.

[0008] By adopting the above technical solution, the user sets the required torque value through the existing knob on the wrench. The knob adjusts the preload of the compression spring. In the initial stage of tightening the bolt, the resistance (reverse torque) on the output shaft is relatively small. At this time, the fifth and sixth stage internal gear ring is held in place by the reaction arm and the steel ball. One end of the reaction arm is held in the groove or hole on the outside of the fifth and sixth stage internal gear ring by the steel ball. Since the spring force is much greater than the current reverse torque, the reaction arm can firmly lock the internal gear ring, so that the fifth and sixth stage planetary gear system can work normally and the power can be continuously output. As the bolt is tightened, the reverse torque on the output shaft becomes larger and larger. This reverse torque will be transmitted in the opposite direction through the gear system, attempting to drive the fifth and sixth stage internal gear ring to rotate. The rotation tendency of the internal gear ring will generate a huge thrust on the reaction arm through the steel ball. When this thrust exceeds the preset pressure of the compression spring, the reaction arm will be pushed open.

[0009] Preferably, the transmission mechanism is a six-stage planetary gear reduction mechanism, comprising a first-stage, second-stage, third-stage, fourth-stage, fifth-stage, and sixth-stage planetary gear system arranged sequentially from the motor end to the output end.

[0010] By adopting the above technical solution, the specific details of the transmission stages can be further recorded.

[0011] Preferably, the reaction arm is provided with M three screws or M four screws respectively.

[0012] By adopting the above technical solution, the reaction arm is equipped with M3 or M4 screws, which facilitates installation and use.

[0013] Preferably, the output end of the first-stage gear carrier assembly is connected to the input end of the second-stage gear carrier assembly, the output end of the second-stage gear carrier assembly is connected to the input end of the third-stage gear carrier assembly, the output end of the third-stage gear carrier assembly is connected to the input end of the fourth-stage gear carrier assembly, the output end of the fourth-stage gear carrier assembly is connected to the input end of the fifth-stage gear carrier assembly, and the output end of the fifth-stage gear carrier assembly is connected to an external sixth-stage internal gear ring or an external sixth-stage sun gear.

[0014] By adopting the above technical solution, it is easier to install and use the driver.

[0015] Preferably, the primary gear carrier assembly is provided with a primary gear carrier gasket, a primary sun gear gasket, and a threaded sleeve.

[0016] By adopting the above technical solution, the threaded sleeve is used to connect the output shaft and the final stage planetary gear carrier, or to replaceably fix the torque output head to the output shaft.

[0017] Preferably, the reaction arm is equipped with a display screen for displaying the power of the internal battery, the display screen is provided with a cover plate, and the reaction arm is fixedly mounted with a mounting shell and an L-shaped frame.

[0018] By adopting the above technical solution and setting up a cover plate, a protective function can be achieved.

[0019] Preferably, a spring is fixedly installed inside the mounting housing, a slider is fixedly installed at one end of the spring, the slider is fixedly installed with the cover plate, a T-slot is opened on one side of the L-shaped frame, a T-block is slidably installed in the T-slot, and the T-block is fixedly installed with one side of the cover plate.

[0020] By adopting the above technical solution, the cover plate is moved by pulling it, and the sliding block moves with it and compresses the spring, thereby removing the obstruction to the display screen. At this time, the power display on the screen can be observed. Furthermore, the movement trajectory of the cover plate can be limited by the T-slot and T-block, thus further improving the stability and firmness during movement.

[0021] In summary, this application includes at least one of the following beneficial technical effects:

[0022] 1. This application utilizes the combined action of a reaction arm, etc. At the moment the reaction arm is pushed open, the steel ball will disengage from the groove of the internal gear ring, and the locking of the fifth and sixth stage internal gear ring will be released. At this time, the fifth and sixth stage internal gear ring begins to "free-spin," the fifth and sixth stage planetary gear system loses its deceleration function, the power is cut off at this stage, the output shaft will stop rotating instantly or decelerate significantly, and at the same time, the internal mechanism will strike the outer shell, producing a clear "click" sound to inform the user that the torque has been reached. The reaction arm retaining spring and the fifth and sixth stage internal gear ring retaining spring are used to fix the position of related parts and prevent them from dislodging. In addition, the lithium battery torque wrench structure of this device is relatively compact and can reduce the overall weight of existing lithium battery torque wrenches, thus avoiding the situation where the operator's hands easily become sore and fatigued in a short period of time.

[0023] 2. This application employs a cover plate and the like, which, when pulled, causes the slider to move as well, compressing the spring and thus removing the obstruction of the display screen. At this time, the power display on the screen can be observed. Furthermore, the movement trajectory of the cover plate can be limited by the T-slot and T-block, thereby further improving the stability and firmness during movement. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of a compact lithium-ion torque wrench according to an embodiment of this application;

[0025] Figure 2 This is a schematic diagram illustrating the main protective structure of the embodiments of this application;

[0026] Figure 3 This is a partial unfolded schematic diagram illustrating the main protective structure in the embodiments of this application;

[0027] Figure 4 This is a schematic diagram illustrating the reset connection portion of the protective structure, which is the main feature of this application embodiment.

[0028] Figure 5 This is a schematic diagram illustrating the limiting and moving part of the protective structure, which is the main feature of this application embodiment;

[0029] Reference numerals: 1. Large gear ring; 2. Fifth / Sixth stage internal gear ring washer; 3. Fifth / Sixth stage internal gear ring bushing; 4. Reaction arm; 5. Reaction arm retaining ring; 6. Fifth stage gear carrier assembly; 7. Fourth stage gear carrier assembly; 8. Fifth / Sixth stage internal gear ring retaining ring; 9. Third stage gear carrier assembly; 10. Threaded sleeve; 11. Connecting disc; 12. Steel ball; 13. Compression spring; 14. Third stage sun gear; 15. First stage gear carrier washer; 16. First stage sun gear washer; 17. First stage gear carrier assembly; 18. High-speed stage flange; 19. First stage gear ring; 20. M3 screw; 21. Second stage gear carrier assembly; 22. M4 screw; 23. Cover plate; 24. L-shaped bracket; 25. Mounting shell; 26. Display screen; 27. Spring; 28. Slider; 29. ​​T-slot; 30. T-block; 31. Outer shell. Detailed Implementation

[0030] The following is in conjunction with the appendix Figures 1-5 This application will be described in further detail.

[0031] This application discloses a compact lithium-ion torque wrench.

[0032] Reference Figure 1 A compact lithium-ion torque wrench includes a housing 31, a motor and a transmission mechanism disposed within the housing 31, and an output shaft for outputting torque. The transmission mechanism is a multi-stage planetary gear reduction mechanism, which includes at least a three-stage, four-stage, five-stage and six-stage planetary gear system that are driven sequentially, and a protective mechanism disposed on the transmission mechanism.

[0033] The transmission mechanism includes a connecting plate 11, a high-speed flange 18, a reaction arm 4, a steel ball 12, a compression spring 13, a fifth and sixth level internal gear ring bushing 3, a large gear ring 1 and a first level gear ring 19. The steel ball 12 is installed in conjunction with the reaction arm 4 under the action of the compression spring 13. The reaction arm 4 is provided with a reaction arm retaining spring 5.

[0034] The transmission mechanism also includes a three-stage gear carrier assembly 9, a two-stage gear carrier assembly 21, a one-stage gear carrier assembly 17, a five-stage gear carrier assembly 6, and a four-stage gear carrier assembly 7. The three-stage gear carrier assembly 9, the two-stage gear carrier assembly 21, the one-stage gear carrier assembly 17, the five-stage gear carrier assembly 6, and the four-stage gear carrier assembly 7 are connected in sequence to transmit power. The three-stage sun gear 14 is one of the input ends of the transmission mechanism. The five-stage and six-stage internal gear ring bushings 3 are respectively provided with five-stage and six-stage internal gear ring washers 2 and five-stage and six-stage internal gear ring retaining springs 8. By setting the washers, the axial clearance of the gears and the preload of the bearings can be adjusted.

[0035] The transmission mechanism is a six-stage planetary gear reduction mechanism, which includes a first-stage, second-stage, third-stage, fourth-stage, fifth-stage, and sixth-stage planetary gear system arranged sequentially from the motor end to the output end.

[0036] In use, the user sets the required torque value using the existing knob on the wrench. The knob adjusts the preload of the compression spring 13. In the initial stage of tightening the bolt, the resistance (reverse torque) on the output shaft is relatively small. At this time, the fifth and sixth stage internal gear ring is held in place by the reaction arm 4 and the steel ball 12. One end of the reaction arm 4 is held in the groove or hole on the outside of the fifth and sixth stage internal gear ring by the steel ball 12. Since the spring force is much greater than the current reverse torque, the reaction arm 4 can firmly lock the internal gear ring, allowing the fifth and sixth stage planetary gear system to work normally and continuously output power. As the bolt is tightened, the reverse torque on the output shaft becomes larger and larger. This reverse torque will be transmitted in the opposite direction through the gear system, attempting to drive the fifth and sixth stage internal gear ring to rotate. The rotation trend of the internal gear ring will generate a huge thrust on the reaction arm 4 through the steel ball 12. When this thrust exceeds the preset pressure of the compression spring 13, the reaction arm 4 will be pushed open.

[0037] Reference Figure 1-2 The reaction arm 4 is provided with M3 screws 20 or M4 screws 22 respectively. The output end of the first-stage gear carrier assembly 17 is connected to the input end of the second-stage gear carrier assembly 21. The output end of the second-stage gear carrier assembly 21 is connected to the input end of the third-stage gear carrier assembly 9. The output end of the third-stage gear carrier assembly 9 is connected to the input end of the fourth-stage gear carrier assembly 7. The output end of the fourth-stage gear carrier assembly 7 is connected to the input end of the fifth-stage gear carrier assembly 6. The output end of the fifth-stage gear carrier assembly 6 is connected to the external sixth-stage internal gear ring or the external sixth-stage sun gear. The first-stage gear carrier assembly 17 is provided with a first-stage gear carrier washer 15, a first-stage sun gear washer 16 and a threaded sleeve 10. The threaded sleeve 10 is used to connect the output shaft and the final stage planetary gear carrier, or to replaceably fix the torque output head to the output shaft.

[0038] When in use, the moment the reaction arm 4 is pushed open, the steel ball 12 will disengage from the groove of the internal gear ring, and the locking of the fifth and sixth stage internal gear ring will be released. At this time, the fifth and sixth stage internal gear ring will start to "free-spin", the fifth and sixth stage planetary gear system will lose its deceleration function, the power will be cut off at this stage, the output shaft will stop rotating instantly or decelerate significantly, and at the same time the internal mechanism will strike the outer shell 31, producing a clear "click" sound to tell the user that the torque has been reached.

[0039] When the user releases the switch, the motor stops, the compression spring 13 pushes the relevant mechanism to reset, the steel ball 12 re-engages into the groove of the fifth and sixth level internal gear ring under the action of the spring force, and the reaction arm 4 also returns to the initial position, ready for the next tightening. The reaction arm retaining spring 5 and the fifth and sixth level internal gear ring retaining spring 8 are used to fix the position of the relevant parts and prevent them from coming out. In addition, the lithium battery torque wrench of this device has a relatively compact structure and can reduce the overall weight of existing lithium battery torque wrenches, thus avoiding the situation where the operator's hands are easily sore and fatigued in a short period of time.

[0040] In this application, the primary gear carrier shim 15 and the fifth and sixth stage internal gear ring bushing 3 are used to reduce friction and wear between the gear and the shaft, ensuring smooth transmission; the fifth and sixth stage internal gear ring achieves rotational or static engagement with the housing 31 through the fifth and sixth stage internal gear ring bushing 3, and achieves precise axial positioning through the fifth and sixth stage internal gear ring shim 2 and the fifth and sixth stage internal gear ring retaining spring 8, preventing axial movement during operation.

[0041] Reference Figure 3-5 The protective mechanism includes a display screen 26 embedded in the reaction arm 4 for displaying the power of the internal battery. The display screen 26 is provided with a cover plate 23. The reaction arm 4 is fixedly installed with a mounting shell 25 and an L-shaped frame 24 respectively.

[0042] A spring 27 is fixedly installed inside the mounting shell 25. A slider 28 is fixedly installed at one end of the spring 27. The slider 28 is fixedly installed with the cover plate 23. A T-slot 29 is opened on one side of the L-shaped frame 24. A T-block 30 is slidably installed in the T-slot 29. The T-block 30 is fixedly installed with one side of the cover plate 23.

[0043] In use, the cover plate 23 is moved by pulling it. The movement of the cover plate 23 will also cause the slider 28 to move and compress the spring 27, thereby removing the obstruction to the display screen 26. At this time, the power display on the display screen 26 can be observed. The movement trajectory of the cover plate 23 can be limited by the T-slot 29 and the T-block 30, thus further improving the stability and firmness during movement.

[0044] The battery and motor described in this application are both prior art, so the specific installation structure and usage process are not described in detail. The display screen 26 described in this application is connected to the battery by a signal and can display the power status in real time. Furthermore, the specific connection and installation method of the mechanical components in this application adopts prior art and the installation method is a method well known to those skilled in the art.

[0045] The implementation principle of a compact lithium-ion torque wrench according to an embodiment of this application is as follows: When in use, the user sets the required torque value through the existing knob on the wrench. The knob will adjust the preload of the compression spring 13. In the initial stage of tightening the bolt, the resistance (reverse torque) on the output shaft is relatively small. At this time, the fifth and sixth stage internal gear ring is held by the reaction arm 4 and the steel ball 12. One end of the reaction arm 4 is held in the groove or hole on the outside of the fifth and sixth stage internal gear ring by the steel ball 12. Since the spring force is much greater than the current reverse torque, the reaction arm 4 can firmly lock the internal gear ring, so that the fifth and sixth stage planetary gear system works normally and the power can be continuously output. As the bolt is tightened more and more, the reverse torque on the output shaft becomes larger and larger. This reverse torque will be transmitted in the opposite direction through the gear system, attempting to drive the fifth and sixth stage internal gear ring to rotate. The rotation trend of the internal gear ring will generate a huge thrust on the reaction arm 4 through the steel ball 12. When this thrust exceeds the preset pressure of the compression spring 13, the reaction arm 4 will be pushed open.

[0046] The moment the reaction arm 4 is pushed open, the steel ball 12 will disengage from the groove of the internal gear ring, and the locking of the fifth and sixth stage internal gear ring will be released. At this time, the fifth and sixth stage internal gear ring will start to "free-spin", the fifth and sixth stage planetary gear system will lose its deceleration function, the power will be cut off at this stage, the output shaft will stop rotating instantly or decelerate significantly, and at the same time the internal mechanism will strike the outer casing 31, producing a clear "click" sound to tell the user that the torque has been reached.

[0047] When the user releases the switch, the motor stops, the compression spring 13 pushes the relevant mechanism to reset, the steel ball 12 re-engages into the groove of the fifth and sixth level internal gear ring under the action of the spring force, and the reaction arm 4 also returns to the initial position, ready for the next tightening. The reaction arm retaining spring 5 and the fifth and sixth level internal gear ring retaining spring 8 are used to fix the position of the relevant parts and prevent them from coming out. In addition, the lithium battery torque wrench of this device has a relatively compact structure and can reduce the overall weight of existing lithium battery torque wrenches, so it can avoid the soreness and fatigue of the operator's hands in a short period of time.

[0048] By pulling the cover plate 23, the cover plate 23 moves and drives the slider 28 to move as well, and compresses the spring 27, thereby removing the obstruction to the display screen 26. At this time, the power display on the display screen 26 can be observed. Furthermore, the movement trajectory of the cover plate 23 can be limited by the T-slot 29 and the T-block 30, thus further improving the stability and firmness during movement.

[0049] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A compact lithium-ion torque wrench, comprising a housing (31), a motor and a transmission mechanism disposed within the housing (31), and an output shaft for outputting torque, characterized in that, The transmission mechanism is a multi-stage planetary gear reduction mechanism, which includes at least a three-stage, four-stage, five-stage and six-stage planetary gear system that are driven sequentially. The transmission mechanism includes a connecting plate (11), a high-speed flange (18), a reaction arm (4), a steel ball (12), a compression spring (13), a fifth and sixth level internal gear ring bushing (3), a large gear ring (1) and a first level gear ring (19). The steel ball (12) is installed in conjunction with the reaction arm (4) under the action of the compression spring (13). The reaction arm (4) is provided with a reaction arm retainer (5). The transmission mechanism also includes a three-stage gear carrier assembly (9), a two-stage gear carrier assembly (21), a one-stage gear carrier assembly (17), a five-stage gear carrier assembly (6), and a four-stage gear carrier assembly (7). The three-stage gear carrier assembly (9), the two-stage gear carrier assembly (21), the one-stage gear carrier assembly (17), the five-stage gear carrier assembly (6), and the four-stage gear carrier assembly (7) are connected in sequence to transmit power. The three-stage sun gear (14) is one of the input ends of the transmission mechanism. The five-stage and six-stage internal gear ring bushings (3) are respectively provided with five-stage and six-stage internal gear ring washers (2) and five-stage and six-stage internal gear ring retaining rings (8).

2. The compact lithium-ion torque wrench according to claim 1, characterized in that: The transmission mechanism is a six-stage planetary gear reduction mechanism, which includes a first-stage, second-stage, third-stage, fourth-stage, fifth-stage, and sixth-stage planetary gear system arranged sequentially from the motor end to the output end.

3. A compact lithium-ion torque wrench according to claim 2, characterized in that: The reaction arm (4) is provided with an M3 screw (20) or an M4 screw (22).

4. A compact lithium-ion torque wrench according to claim 1, characterized in that: The output end of the first-stage gear carrier assembly (17) is connected to the input end of the second-stage gear carrier assembly (21), the output end of the second-stage gear carrier assembly (21) is connected to the input end of the third-stage gear carrier assembly (9), the output end of the third-stage gear carrier assembly (9) is connected to the input end of the fourth-stage gear carrier assembly (7), the output end of the fourth-stage gear carrier assembly (7) is connected to the input end of the fifth-stage gear carrier assembly (6), and the output end of the fifth-stage gear carrier assembly (6) is connected to the external sixth-stage internal gear ring or the external sixth-stage sun gear.

5. A compact lithium-ion torque wrench according to claim 4, characterized in that: The primary gear carrier assembly (17) is provided with a primary gear carrier gasket (15), a primary sun gear gasket (16), and a threaded sleeve (10).

6. A compact lithium-ion torque wrench according to claim 1, characterized in that: The reaction arm (4) is inlaid with a display screen (26) for displaying the power of the internal storage battery. The display screen (26) is provided with a cover plate (23). The reaction arm (4) is fixedly installed with a mounting shell (25) and an L-shaped frame (24).

7. A compact lithium-ion torque wrench according to claim 6, characterized in that: A spring (27) is fixedly installed inside the mounting shell (25). A slider (28) is fixedly installed at one end of the spring (27). The slider (28) is fixedly installed with the cover plate (23). A T-slot (29) is opened on one side of the L-shaped frame (24). A T-block (30) is slidably installed in the T-slot (29). The T-block (30) is fixedly installed with one side of the cover plate (23).

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