Torque adjustment mechanism and power tool

Abstract

The application relates to the field of electric tools, and particularly discloses a torque adjusting mechanism and an electric tool, wherein the torque adjusting mechanism comprises a main body, a circuit board arranged on the main body, a potentiometer electrically connected with the circuit board, and an adjusting ring sleeved outside the main body and capable of rotating circumferentially outside the main body, wherein the triggering end of the potentiometer is sleeved with a linkage member, the outer wall surface of the linkage member is in abutment with the inner wall surface of the adjusting ring, the adjusting ring generates deformation by extruding the linkage member, the deformed linkage member and the triggering end form a rotating resistance, and the adjusting ring drives the triggering end to rotate under the torque of the rotating resistance, so as to adjust the resistance grade of the potentiometer. The application adopts the stepless adjusting mode of the potentiometer, can realize more accurate torque grading, the rotating linkage between the adjusting ring and the linkage member is realized in the mode of extrusion, the contact position of the adjusting ring and the linkage member does not need to be lubricated, and the problems of jamming and abnormal sound in the adjusting process do not exist.

Description

Technical Field

[0001] This application relates to the field of power tools, and in particular to a torque adjustment mechanism and a power tool. Background Technology

[0002] In power tools (such as electric screwdrivers and drills), the torque adjustment mechanism is one of the key functional components. Its function is to precisely control the output torque according to different work requirements to prevent screws from being overtightened or workpieces from being damaged. Some torque adjustment mechanisms typically use mechanical clutches or electronic control methods to achieve torque regulation.

[0003] Taking electronic torque adjustment mechanisms as an example, the adjustment ring and potentiometer of some torque adjustment mechanisms are usually connected by gears or direct hard connection. The adjustment ring and gear need to be lubricated and maintained regularly. If the maintenance is not in place, abnormal noise or jamming may occur when the adjustment ring adjusts the potentiometer. Utility Model Content

[0004] The purpose of at least one specific embodiment of this utility model is to overcome the defects of the prior art and provide a torque adjustment mechanism and a power tool.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A torque regulating mechanism, comprising:

[0007] main body;

[0008] The circuit board is mounted on the main body;

[0009] A potentiometer, which is electrically connected to the circuit board;

[0010] The adjusting ring is fitted onto the outside of the main body and can rotate circumferentially relative to the main body;

[0011] The potentiometer's trigger end is fitted with a linkage component. The outer wall of the linkage component abuts against one wall of the adjustment ring. The adjustment ring deforms by squeezing the linkage component. The deformed linkage component and the trigger end form a rotational resistance. When the adjustment ring rotates, under the torque of the rotational resistance, the adjustment ring drives the trigger end to rotate, thereby adjusting the potentiometer's resistance level.

[0012] Furthermore, one wall of the adjusting ring is the inner wall of the adjusting ring.

[0013] Furthermore, the outer wall of the linkage component has a protrusion, and the inner wall of the adjusting ring has a groove. When the potentiometer is in the initial or final resistance setting, the protrusion and the groove are matched.

[0014] Furthermore, the protrusion includes a first protrusion and a second protrusion, and the groove includes a first groove and a second groove;

[0015] When the potentiometer is in the initial resistance setting, the first protrusion matches the first groove, and the adjustment ring drives the trigger terminal of the potentiometer to rotate through the linkage. When the potentiometer is in the final resistance setting, the second protrusion matches the second groove.

[0016] Furthermore, when the length of the arc segment between the first and second grooves on the adjusting ring is consistent with the circumference of the outer wall of the linkage, the set positions of the first and second protrusions on the linkage coincide.

[0017] Furthermore, as the potentiometer's resistance level gradually increases from the initial level to the final level, the adjusting ring drives the linkage to rotate in the forward direction through the meshing force between the first groove and the first protrusion.

[0018] As the potentiometer's resistance setting gradually decreases from the final setting to the initial setting, the adjusting ring, through the meshing force between the second groove and the second protrusion, drives the linkage to start rotating in the opposite direction.

[0019] Furthermore, the linkage is made of flexible material.

[0020] Furthermore, the outer wall surface of the linkage and / or the inner wall surface of the adjusting ring are friction surfaces.

[0021] Furthermore, a gear shift tactile component is provided between the adjustment ring and the main body, the gear shift tactile component including:

[0022] Tactile steel balls;

[0023] A spring, one end of which is connected to a tactile steel ball, and the other end of which is connected to the main body;

[0024] The gear slots are multiple and located on the inner wall of the adjusting ring;

[0025] The adjustment ring drives the trigger end of the potentiometer to rotate through the linkage. When the potentiometer is in different resistance ranges, the tactile steel ball matches the different range slots to form the tactile feedback for adjusting the resistance range.

[0026] The advantages of the torque adjustment mechanism provided in this application compared to the prior art are as follows: The adjustment ring of this application deforms by squeezing the linkage component. The deformed linkage component and the trigger end form a rotational resistance. When the adjustment ring rotates, under the torque of the rotational resistance, the adjustment ring drives the trigger end to rotate, thereby adjusting the resistance level of the potentiometer. By adopting the stepless adjustment method of the potentiometer, more precise torque grading can be achieved. Moreover, the rotational linkage between the adjustment ring and the linkage component is achieved by squeezing. The contact position between the adjustment ring and the linkage component does not require lubrication, and there will be no problem of jamming or abnormal noise during the adjustment process.

[0027] Another technical solution adopted in this application is: providing an electric tool, which includes:

[0028] chassis;

[0029] The battery unit is housed within the casing.

[0030] The motor is electrically connected to the battery cell;

[0031] A reduction gearbox, whose power input end is connected to a motor;

[0032] The output shaft has one end connected to the power output end of the reduction gearbox and the other end connected to the tool head.

[0033] The aforementioned torque adjustment mechanism has a circuit board electrically connected to the motor, a main body installed inside the housing, and an adjustment ring rotatably mounted on the housing.

[0034] When adjusting the potentiometer's resistance setting, the motor's output torque is adjusted accordingly.

[0035] The power tool provided in this application, having the aforementioned torque adjustment mechanism, possesses the technical effects of the aforementioned torque adjustment mechanism. Attached Figure Description

[0036] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0037] Figure 1 This is a schematic diagram of the torque adjustment mechanism in Embodiment 1 of this application.

[0038] Figure 2 This is a schematic diagram of the longitudinal cross-section of the potentiometer in this application.

[0039] Figure 3 This is a schematic diagram of the structure of Embodiment 2 of this application.

[0040] Figure 4 This is an exploded view of Embodiment 2 of this application.

[0041] Figure 5 This is a schematic diagram of the longitudinal section at the potentiometer in Embodiment 2 of this application.

[0042] Figure 6 This is a longitudinal cross-sectional view of the gear shift tactile component in Embodiment 2 of this application. Detailed Implementation

[0043] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0044] Example 1

[0045] Reference Figure 1 , Figure 2 A torque adjustment mechanism 100 includes a main body 10, a circuit board 20 mounted on the main body 10, a potentiometer 30 electrically connected to the circuit board 20, and an adjustment ring 40 sleeved on the outside of the main body 10 and rotatable circumferentially. A linkage member 50 is sleeved on the trigger end 301 of the potentiometer 30. The outer wall surface of the linkage member 50 abuts against the inner wall surface of the adjustment ring 40. The adjustment ring 40 deforms by pressing the linkage member 50, creating rotational resistance between the deformed linkage member 50 and the trigger end 301. When the adjustment ring rotates, the torque of the rotational resistance causes the adjustment ring 40 to drive the trigger end 301 to rotate, thereby adjusting the resistance level of the potentiometer 30. This application uses a stepless potentiometer adjustment method, which can achieve more precise torque grading. Moreover, the adjustment ring 40 and the linkage member 50 achieve rotational linkage through compression, eliminating the need for lubrication at the contact point between the adjustment ring 40 and the linkage member 50, and preventing jamming and abnormal noise during adjustment.

[0046] In this embodiment, the linkage 50 is made of a flexible material, specifically soft rubber. The soft rubber linkage 50 has good deformation performance. When squeezed by the inner wall of the adjusting ring 40, the deformed linkage 50 can form a large rotational resistance with the trigger end 301, thereby realizing the linkage between the trigger end 301 and the adjusting ring 40. In addition, in order to improve the friction between the adjusting ring 40 and the linkage 50, the outer wall of the linkage 50 and / or the inner wall of the adjusting ring 40 can be a friction surface. Furthermore, in order to improve the firmness of the connection between the linkage 50 and the trigger end 301, the trigger end 301 can be a hexagonal rod. After the linkage 50 is sleeved on the outside of the trigger end 301, it is not easy for it to rotate relative to the trigger end 301.

[0047] Specifically, the outer wall of the linkage 50 is provided with a protrusion, and the inner wall of the adjusting ring 40 is provided with a groove. When the resistance setting of the potentiometer 30 is the initial setting or the end setting, the protrusion and the groove are matched.

[0048] Furthermore, the protrusion includes a first protrusion 501 and a second protrusion 502, and the groove includes a first groove 401 and a second groove 402;

[0049] When the resistance setting of potentiometer 30 is in the initial setting, the first protrusion 501 matches the first groove 401, and the adjustment ring 40 drives the trigger terminal 301 of potentiometer 30 to rotate through the linkage 50. When the resistance setting of potentiometer 30 is in the final setting, the second protrusion 502 matches the second groove 402.

[0050] Furthermore, in some embodiments, when the length of the arc segment between the first groove 401 and the second groove 402 on the adjusting ring 40 is consistent with the perimeter of the outer wall surface of the linkage member 50, the set positions of the first protrusion 501 and the second protrusion 502 on the linkage member 50 coincide. In this case, the number of protrusions on the outer wall surface of the linkage member 50 can be set to one.

[0051] Furthermore, as the resistance level of potentiometer 30 gradually increases from the initial level to the final level, the adjusting ring 40 drives the linkage 50 to start rotating in the forward direction through the meshing force between the first groove 401 and the first protrusion 501.

[0052] When the resistance range of potentiometer 30 is gradually decreased from the end range to the initial range, the adjusting ring 40 drives the linkage 50 to start rotating in the opposite direction through the meshing force between the second groove 402 and the second protrusion 502.

[0053] In addition, to improve the tactile feedback of adjusting the resistance level of potentiometer 30, a level-sensing assembly is provided between the adjusting ring 40 and the main body 10 during the adjustment of the resistance level. This assembly includes a mounting cylinder 101 mounted on the main body 10, a tactile ball 102 at the end of the mounting cylinder 101, and a spring 103 connecting the tactile ball 102 to the bottom of the mounting cylinder 101. Multiple level slots 403 are provided on the inner wall of the adjusting ring 40. The torque adjustment mechanism 100 typically has multiple levels; for example, four levels. These gear positions include zero gear (initial gear), first gear, second gear, third gear, and fourth gear (final gear). Correspondingly, the inner wall of the adjusting ring 40 has five gear slots 403, which are equally spaced. For ease of explanation, the five gear slots 403 are designated as first gear slot 4031, second gear slot 4032, third gear slot 4033, fourth gear slot 4034, and fifth gear slot 4035. When the torque adjusting mechanism 100 is in the zero gear (initial gear), the linkage 5... The first protrusion 501 of the adjustment ring 40 matches the first groove 401 of the adjustment ring 40. Simultaneously, the tactile steel ball 102 is located within the first gear position groove 4031. When adjusting to the first gear position, rotating the adjustment ring 40 clockwise causes the first groove 401 to press against the first protrusion 501 and gradually displace it. This pressure, through the linkage 50, causes the trigger end 301 of the potentiometer 30 to rotate. At the same time, the first gear position groove 4031 of the rotating adjustment ring 40 separates from the tactile steel ball 102, and the inner wall of the adjustment ring 40 presses against the tactile steel ball 102. The tactile ball 102 is pressed, and the spring 103 is compressed until the second gear slot 4032 corresponds to the position of the tactile ball 102. Then the spring 103 returns to its original position, the tactile ball 102 is squeezed into the second gear slot 4032, and a "click" sound is produced, indicating that the torque adjustment mechanism 100 has been successfully adjusted to the first gear. During the gear shifting process, the tactile ball 102 popping into the second gear slot 4032 and the "click" sound can give the user's palm a very obvious tactile sensation, indicating that the gear shift is successful.

[0054] Similarly, as the adjusting ring 40 continues to rotate, the compressed linkage 50 drives the trigger end 301 of the potentiometer 30 to continue rotating until the tactile steel ball 102 is squeezed into the third gear slot 4033 and a "click" sound is produced, indicating that the torque adjusting mechanism 100 has been successfully adjusted to the second gear. The adjustment method for the third gear is similar to that for the second gear. When the tactile steel ball 102 is squeezed into the fifth gear slot 4035, it indicates that the torque adjusting mechanism 100 has been successfully adjusted to the fourth gear (the final gear). At the same time, the second protrusion 502 on the linkage 50 matches the second groove 402 on the inner wall of the adjusting ring 40, and the adjustment process of the torque adjusting mechanism 100 from the initial gear to the final gear is completed. Similarly, when it is necessary to adjust from the final gear to the initial gear, the adjusting ring 40 is rotated counterclockwise. The adjustment process at this time is the opposite of the gear adjustment process described above. The specific principle will not be elaborated here.

[0055] Example 2

[0056] Reference Figures 3 to 6 This embodiment discloses an electric tool 200, which includes a housing 201, a battery unit 202 disposed in the housing 201, a motor 203 electrically connected to the battery unit 202, a reduction gearbox 204 whose power input end is connected to the motor 203, and an output shaft 205 connected to the reduction gearbox 204. One end of the output shaft 205 is connected to the power output end of the reduction gearbox 204, and the other end is connected to the tool head.

[0057] In the above embodiment, the torque adjustment mechanism is installed on the housing 201. The housing 201 is provided with a control circuit board 206 and a circuit board 20 of the torque adjustment mechanism. The circuit board 20 of the torque adjustment mechanism is installed in the housing 201 and is electrically connected to the motor 203 and the battery unit 202. The main body 10 of the torque adjustment mechanism is installed in the housing 201, and the adjustment ring 40 is rotatably installed on the housing 201.

[0058] In addition, the housing 201 is equipped with a button 207 for controlling the start and stop of the motor 203. The housing 201 has an indicator mark 208, and the adjusting ring 40 has a gear mark 209. When the power tool 200 is in use, the button 207 is pressed, the motor 203 starts, and the output torque of the motor 203 is transmitted to the reduction gearbox 204. The reduction gearbox 204 drives the output shaft 205 to rotate. When a screwdriver bit is installed at the end of the output shaft 205, the power tool 200 becomes an electric screwdriver, realizing precise screw tightening / loosening operations. During the screw tightening / loosening operation, the resistance setting of potentiometer 30 is adjusted by rotating the adjusting ring 40, thereby precisely controlling the output torque of output shaft 205. When adjusting the resistance setting, rotating the adjusting ring 40 will cause a setting mark 209 on the adjusting ring 40 to correspond to an indicator mark 208 on the housing 201, indicating that the electric screwdriver is in the resistance setting corresponding to that setting mark 209. During the resistance setting switching process of potentiometer 30, potentiometer 30 changes its resistance value and outputs different voltage signals (usually 0-5V or PWM signal). This signal is transmitted to the control circuit of motor 203. The control circuit adjusts the motor current (current ∝ torque) through the potentiometer signal. When the current reaches the set threshold, the power is immediately cut off / brake is applied to achieve precise torque control.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A torque adjustment mechanism, comprising: main body; A circuit board, which is disposed on the main body; A potentiometer, which is electrically connected to the circuit board; An adjusting ring, which is sleeved on the outside of the main body, is circumferentially rotatable relative to the main body; The potentiometer is characterized in that a linkage member is sleeved on the trigger end, the outer wall of the linkage member abuts against one wall of the adjustment ring, the adjustment ring deforms by squeezing the linkage member, and a rotational resistance is formed between the deformed linkage member and the trigger end. When the adjustment ring rotates, under the torque of the rotational resistance, the adjustment ring drives the trigger end to rotate, thereby adjusting the resistance level of the potentiometer.

2. The torque adjustment mechanism according to claim 1, characterized in that, One wall of the adjusting ring is the inner wall of the adjusting ring.

3. The torque adjustment mechanism according to claim 2, characterized in that, The outer wall of the linkage component has a protrusion, and the inner wall of the adjustment ring has a groove. When the resistance setting of the potentiometer is the initial setting or the final setting, the protrusion and the groove are adapted to each other.

4. The torque adjustment mechanism according to claim 3, characterized in that, The protrusion includes a first protrusion and a second protrusion, and the groove includes a first groove and a second groove; When the potentiometer is in the initial resistance setting, the first protrusion matches the first groove, and the adjustment ring drives the trigger end of the potentiometer to rotate through the linkage. When the potentiometer is in the final resistance setting, the second protrusion matches the second groove.

5. The torque adjustment mechanism according to claim 4, characterized in that, When the length of the arc segment between the first and second grooves on the adjusting ring is consistent with the circumference of the outer wall of the linkage, the first and second protrusions coincide at their designated positions on the linkage.

6. The torque adjustment mechanism according to claim 4, characterized in that, As the resistance level of the potentiometer gradually increases from the initial level to the final level, the adjusting ring drives the linkage to start rotating in the forward direction through the meshing force between the first groove and the first protrusion. As the resistance level of the potentiometer gradually decreases from the final level to the initial level, the adjusting ring drives the linkage to rotate in the opposite direction through the meshing force between the second groove and the second protrusion.

7. The torque adjusting mechanism according to claim 1, characterized in that, The linkage component is made of flexible material.

8. The torque adjusting mechanism according to claim 2, characterized in that, The outer wall surface of the linkage component and / or the inner wall surface of the adjusting ring are friction surfaces.

9. The torque adjusting mechanism according to claim 1, characterized in that, A gear shift tactile component is provided between the adjustment ring and the main body, the gear shift tactile component comprising: Tactile steel balls; A spring, one end of which is connected to the tactile steel ball, and the other end of which is connected to the main body; Multiple gear slots are provided and located on the inner wall surface of the adjustment ring; The adjustment ring drives the trigger end of the potentiometer to rotate through the linkage. When the potentiometer is in different resistance ranges, the tactile steel ball matches the different range slots to form a resistance range adjustment tactile feel.

10. An electric tool, comprising: chassis; Battery cell; It is housed within the casing; A motor, which is electrically connected to the battery cell; A reduction gearbox, the power input end of which is connected to the motor; The output shaft has one end connected to the power output end of the reduction gearbox and the other end connected to the tool head. The torque adjustment mechanism according to any one of claims 1-9, wherein the circuit board is electrically connected to the motor, the main body is installed inside the housing, and the adjustment ring is rotatably mounted on the housing; When the adjusting ring adjusts the resistance setting of the potentiometer, the motor correspondingly adjusts its output torque.

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