Power tool

Abstract

The application provides an electric tool, belonging to the technical field of electromechanics, comprising: a shell; a driving mechanism comprising: a motor; the motor is used for outputting power; a clutch mechanism comprising: a first clutch disc, a second clutch disc and an elastic element; the motor drives the first clutch disc to rotate, the first clutch disc can interrupt torque transmission to the second clutch disc, the elastic element is arranged around an output shaft, one end of the elastic element biases the second clutch disc; a first sliding way, an inclined slope, a second sliding way and a step part are sequentially arranged on the first clutch disc or the second clutch disc; the second sliding way is arranged in parallel or downwardly inclined from the inclined slope to the step part relative to a first plane; an output shaft is driven by the second clutch disc to rotate; a sensor assembly is located near the clutch mechanism and is used for detecting axial displacement of the second clutch disc; wherein the first plane is a plane where the other side of the clutch disc where the second sliding way is located. The application can reduce the influence of the reaction force on the user when the tool is clutched and improve the accuracy of the output torque.

Description

Technical Field

[0001] This application relates to the field of electromechanical technology, and more particularly to an electric tool. Background Technology

[0002] Different types of power tools are used in various industries. Among them, clutch-type torque tools are a common type of tool. Their main feature is that the torque can be set and is adjustable. They are mainly used in the steel structure installation industry, specifically for installing high-strength bolts in steel structures.

[0003] This type of tool typically uses a clutch mechanism, mainly consisting of clutch elements and elastic elements, to achieve automatic clutch engagement and disengagement at a set torque. However, due to the structure of the clutch elements, existing clutch mechanisms generate a large reaction force on the user when the tool engages or disengages under high torque, causing the handle to twist and making it difficult to operate. Furthermore, because it is impossible to accurately monitor the occurrence, process, and termination of clutch engagement, it is difficult to accurately control the precision of the tool's output torque, thus affecting the tool's applicable range and scenarios. Utility Model Content

[0004] In view of this, this application provides a power tool that can reduce the impact of the reaction force when the power tool is engaged or disengaged on the user, avoid hand twisting, and improve the accuracy of the output torque by setting a sensor to detect the engagement or disengagement of the tool.

[0005] In a first aspect, embodiments of this application provide an electric tool, the electric tool comprising:

[0006] case;

[0007] The drive mechanism includes a motor for outputting power.

[0008] A clutch mechanism, comprising: a first clutch disc, a second clutch disc, and an elastic element; the motor drives the first clutch disc to rotate, the first clutch disc can interruptibly transmit torque to the second clutch disc, the elastic element is arranged around the output shaft, and one end of the elastic element biases against the second clutch disc;

[0009] The first clutch disc or the second clutch disc is provided with a first slide, a ramp, a second slide, and a step in sequence; the second slide is arranged parallel to or inclined downward from the ramp to the step relative to the first plane;

[0010] An output shaft, which is driven to rotate by the second clutch disc;

[0011] A sensor assembly located near the clutch mechanism for detecting the axial displacement of the second clutch disc;

[0012] The first plane is the plane on the other side of the clutch disc where the second slide is located.

[0013] In some embodiments, the sensor assembly includes: a magnetic induction component, a magnetic component, and a retainer; the retainer abuts against the second clutch disc, the magnetic component is fixed to the retainer, and the magnetic induction component is fixed to the housing.

[0014] In some embodiments, the power tool further includes a clutch assembly located between the first clutch disc and the second clutch disc;

[0015] When the power tool engages the clutch, the second clutch disc overcomes the biasing force of the elastic element and undergoes axial displacement. The retainer also undergoes axial displacement along with the second clutch disc. The magnetic component on the retainer can be sensed by the magnetic induction component to generate a Hall signal. The controller of the power tool calculates the axial displacement of the second clutch disc based on the Hall signal, thereby determining the position of the clutch assembly on the first clutch disc or the second clutch disc.

[0016] In some embodiments, the sensor assembly includes: a retainer, a spring, and a pressure sensor; one end of the retainer abuts against the second clutch disc, the other end of the retainer abuts against one end of the spring, and the other end of the spring abuts against the pressure sensor.

[0017] In some embodiments, the power tool further includes a clutch assembly located between the first clutch disc and the second clutch disc;

[0018] When the power tool engages the clutch, the second clutch disc overcomes the biasing force of the elastic element and undergoes axial displacement. The retainer also undergoes axial displacement along with the second clutch disc, causing a change in the biasing force of the spring on the pressure sensor. The controller of the power tool calculates the axial displacement of the second clutch disc based on the change in biasing force or the magnitude of the biasing force, thereby determining the position of the clutch assembly on the first clutch disc or the second clutch disc.

[0019] In some embodiments, the sensor assembly includes a pressure sensor located between the elastic element and the second clutch disc;

[0020] When the power tool engages the clutch, the second clutch disc overcomes the biasing force of the elastic element and undergoes axial displacement. The pressure sensor can detect the magnitude or change of the biasing force of the elastic element on the second clutch disc. The controller of the power tool calculates the axial displacement of the second clutch disc based on the magnitude or change of the biasing force, thereby determining the position of the clutch assembly on the first clutch disc or the second clutch disc.

[0021] In some embodiments, the power tool further includes:

[0022] A torque adjustment mechanism, comprising: an adjusting member, the adjusting member being biased by the other end of the elastic element, the adjusting member having a second thread, the adjusting member engaging with a first thread provided on the output shaft via the second thread to adjust the biasing force of the elastic element on the second clutch disc.

[0023] In some embodiments, the sensor assembly includes a pressure sensor located between the torque adjustment mechanism and the elastic element;

[0024] When the power tool engages the clutch, the second clutch disc overcomes the biasing force of the elastic element and undergoes axial displacement. The pressure sensor can detect the magnitude or change of the biasing force of the elastic element on the second clutch disc. The controller of the power tool calculates the axial displacement of the second clutch disc based on the magnitude or change of the biasing force, thereby determining the position of the clutch assembly on the first clutch disc or the second clutch disc.

[0025] Secondly, embodiments of this application provide a power tool, the power tool comprising:

[0026] case;

[0027] The drive mechanism includes a motor for outputting power.

[0028] A clutch mechanism, comprising: a first clutch disc, a second clutch disc, and an elastic element; the motor drives the first clutch disc to rotate, the first clutch disc can interruptibly transmit torque to the second clutch disc, the elastic element is arranged around the output shaft, and one end of the elastic element biases against the second clutch disc;

[0029] The first clutch disc or the second clutch disc is provided with a first slide, a ramp, a second slide, and a step in sequence;

[0030] When the power tool engages or disengages, it includes a first engagement stage and a second engagement stage. During the second engagement stage, the biasing force of the elastic element on the first or second clutch disc never increases.

[0031] The first clutch phase occurs in the first slide rail, and the second clutch phase occurs in the second slide rail;

[0032] An output shaft, which is driven to rotate by the second clutch disc;

[0033] A sensor assembly, located near the clutch mechanism, is used to detect the axial displacement of the second clutch disc.

[0034] Thirdly, embodiments of this application provide a DC torque wrench, the DC torque wrench comprising:

[0035] case;

[0036] A drive mechanism, comprising: a motor and a transmission assembly; the motor being connected to the transmission assembly to transmit power;

[0037] A battery pack is used to power the motor;

[0038] A clutch mechanism, comprising: a first clutch disc, a second clutch disc, and an elastic element; the motor drives the first clutch disc to rotate, the first clutch disc can interruptibly transmit torque to the second clutch disc, the elastic element is arranged around the output shaft, and one end of the elastic element biases against the second clutch disc;

[0039] A first slide, a ramp, a second slide, and a step are sequentially provided on one side of the first clutch disc or the second clutch disc; the second slide is arranged parallel to or inclined downward from the ramp toward the step relative to the first plane.

[0040] An output shaft, which is driven to rotate by the second clutch disc;

[0041] A sensor assembly located near the clutch mechanism for detecting the axial displacement of the second clutch disc;

[0042] The first plane is the plane on the other side of the first clutch disc or the second clutch disc.

[0043] Fourthly, embodiments of this application provide an AC torque wrench, the AC torque wrench comprising:

[0044] case;

[0045] A drive mechanism, comprising: a motor and a transmission assembly; the motor being connected to the transmission assembly to transmit power;

[0046] A clutch mechanism, comprising: a first clutch disc, a second clutch disc, and an elastic element; the motor drives the first clutch disc to rotate, the first clutch disc can interruptibly transmit torque to the second clutch disc, the elastic element is arranged around the output shaft, and one end of the elastic element biases against the second clutch disc;

[0047] The first clutch disc or the second clutch disc is provided with a first slide, a ramp, a second slide, and a step in sequence;

[0048] When the power tool engages or disengages, it includes a first engagement stage and a second engagement stage. During the second engagement stage, the biasing force of the elastic element on the first or second clutch disc never increases.

[0049] The first clutch phase occurs in the first slide rail, and the second clutch phase occurs in the second slide rail;

[0050] An output shaft, which is driven to rotate by the second clutch disc;

[0051] A sensor assembly, located near the clutch mechanism, is used to detect the axial displacement of the second clutch disc.

[0052] This application provides an electric tool, comprising: a housing; a drive mechanism including: a motor; the motor for outputting power; a clutch mechanism including: a first clutch disc, a second clutch disc, and an elastic element; the motor drives the first clutch disc to rotate, the first clutch disc intermittently transmits torque to the second clutch disc, the elastic element is arranged around the output shaft, and one end of the elastic element biases the second clutch disc; the first clutch disc or the second clutch disc is sequentially provided with a first slide, a ramp, a second slide, and a step; the second slide is arranged parallel to or inclined downwards from the ramp to the step relative to the first plane; an output shaft is driven to rotate by the second clutch disc; a sensor assembly is located near the clutch mechanism for detecting the axial displacement of the second clutch disc; wherein, the first plane is the plane on the other side of the clutch disc where the second slide is located. This application divides the clutch process into multiple stages by setting a first slide, a ramp, a second slide, and a step on the clutch disc, thereby reducing the impact of the reaction force on the user when the tool is engaged or disengaged. At the same time, a sensor assembly is set to monitor the engagement and disengagement of the tool, providing data support for subsequent control of the tool after engagement and disengagement, and improving the accuracy of the tool's output torque. Attached Figure Description

[0053] Figure 1 This is a cross-sectional view of a power tool according to an embodiment of this application;

[0054] Figure 2 This is a schematic diagram of the torque detection mechanism 80 and the clutch detection mechanism 90 in another embodiment of this application;

[0055] Figure 3 This is a schematic diagram of the clutch disc and clutch assembly in the embodiments of this application;

[0056] Figure 4 This is a schematic diagram of the clutch disc and clutch assembly in another embodiment of this application;

[0057] Figure 5 This is a schematic diagram of the clutch disc structure in an embodiment of this application;

[0058] Figure 6 This is a schematic diagram of the clutch disc structure in another embodiment of this application;

[0059] Figure 7 This is a schematic diagram of the clutch disc structure in another embodiment of this application;

[0060] Figure 8 This is a schematic diagram of the clutch disc structure in another embodiment of this application;

[0061] Figure 9 This is a waveform diagram of the motor operating duty cycle in an embodiment of this application;

[0062] Figure 10 This is a schematic diagram of the clutch disc structure in another embodiment of this application;

[0063] Figure 11 This is a schematic diagram of the clutch detection mechanism in the embodiments of this application;

[0064] Figure 12 This is a schematic diagram of the clutch detection mechanism in another embodiment of this application;

[0065] Figure 13 This is a schematic diagram of the structure of a DC constant torque wrench according to an embodiment of this application;

[0066] Figure 14 This is a schematic diagram of the structure of an AC torque wrench according to an embodiment of this application;

[0067] Figure 15 This is a functional block diagram of a control system for a power tool according to an embodiment of this application;

[0068] Figure 16 This is a circuit diagram of an electric tool according to an embodiment of this application;

[0069] Figure 17 This is a flowchart illustrating a method for recognizing the clutch state of an electric tool according to an embodiment of this application;

[0070] Figure 18 The diagram shows the current change curve when the power tool engages or disengages in an embodiment of this application.

[0071] Figure 19 This is a flowchart illustrating a clutch control method for an electric tool according to an embodiment of this application.

[0072] The attached diagram is labeled as follows:

[0073] Housing 10, output shaft 20, first thread 201, drive mechanism 30, motor 301, transmission assembly 302, clutch mechanism 40, first clutch disc 401, first groove 4011, second clutch disc 402, first slide rail 4021, ramp 4022, second slide rail 4023, step portion 4024, elastic element 403, clutch assembly 404, torque adjustment mechanism 50, adjusting nut 501, second thread 503, torque adjustment gear 502, torque detection mechanism 80, pressure sensor 804, flat bearing 805, gasket 806, clutch detection mechanism 90, magnetic component 901, magnetic induction component 902, cage 903, spring 904, battery pack 200, power cord 300, display screen 400. Detailed Implementation

[0074] To make the technical solution and beneficial effects of this application more apparent and understandable, a detailed description is provided below by listing specific embodiments. The accompanying drawings are not necessarily drawn to scale, and local features may be enlarged or reduced to more clearly show the details of the local features; unless otherwise defined, the technical and scientific terms used herein have the same meanings as those in the technical field to which this application pertains.

[0075] This disclosure is not exhaustive, but merely illustrative of some embodiments, and is not intended to limit the scope of protection of this disclosure. Unless otherwise specified, each step in a particular embodiment can be implemented as an independent embodiment, and the steps can be arbitrarily combined. For example, a solution after removing some steps in a particular embodiment can also be implemented as an independent embodiment, and the order of the steps in a particular embodiment can be arbitrarily interchanged. Furthermore, the optional implementation methods in a particular embodiment can be arbitrarily combined; moreover, the embodiments can be arbitrarily combined, for example, some or all steps of different embodiments can be arbitrarily combined, and a particular embodiment can be arbitrarily combined with the optional implementation methods of other embodiments.

[0076] In each of the disclosed embodiments, unless otherwise specified or in case of logical conflict, the terminology and / or descriptions of the embodiments are consistent and can be referenced by each other. Technical features in different embodiments can be combined to form new embodiments based on their inherent logical relationships.

[0077] The terminology used in the embodiments of this disclosure is for the purpose of describing particular embodiments only and is not intended to limit the scope of this disclosure.

[0078] In this embodiment of the disclosure, unless otherwise stated, elements expressed in the singular form, such as "a," "an," "the," "the," "the," "the," "the," "the," "this," etc., can mean "one and only one," or "one or more," "at least one," etc. For example, when using articles such as "a," "an," "the," etc. in translation, the noun following the article can be understood as either a singular expression or a plural expression.

[0079] In the embodiments disclosed herein, "multiple" refers to two or more.

[0080] In some embodiments, the terms “at least one of”, “one or more”, “a plurality of”, “multiple”, etc., may be used interchangeably.

[0081] The prefixes "first," "second," etc., used in the embodiments of this disclosure are merely for distinguishing different descriptive objects and do not impose restrictions on the position, order, priority, value, or content of the descriptive objects. The description of the descriptive objects should be found in the claims or the context of the embodiments, and the use of prefixes should not constitute unnecessary restrictions. For example, if the descriptive object is a "field," the ordinal numbers preceding "field" in "first field" and "second field" do not restrict the position or order of the "fields." "First" and "second" do not restrict whether the "fields" they modify are in the same message, nor do they restrict the order of "first field" and "second field." Similarly, if the descriptive object is a "level," the ordinal numbers preceding "level" in "first level" and "second level" do not restrict the priority between "levels." Furthermore, the value of the descriptive object is not limited by ordinal numbers and can be one or more. For example, in "first device," the value of "device" can be one or more. Furthermore, the objects modified by different prefixes can be the same or different. For example, if the object being described is "device", then "first device" and "second device" can be the same device or different devices, and their types can be the same or different. Similarly, if the object being described is "information", then "first information" and "second information" can be the same information or different information, and their content can be the same or different.

[0082] In some embodiments, terms such as “…”, “determine…”, “in the case of…”, “when…”, “when…”, “if…”, etc. can be used interchangeably.

[0083] In some embodiments, the terms “greater than,” “greater than or equal to,” “not less than,” “more than,” “more than or equal to,” “not less than,” “higher than,” “higher than or equal to,” “not lower than,” and “above” can be used interchangeably, as can the terms “less than,” “less than or equal to,” “not greater than,” “less than,” “less than or equal to,” “not more than,” “lower than,” “lower than or equal to,” “not higher than,” and “below”.

[0084] Furthermore, each element, each row, or each column in the embodiments of this disclosure can be implemented as an independent embodiment, and any combination of any element, any row, or any column can also be implemented as an independent embodiment.

[0085] In one possible implementation, such as Figure 1 As shown, the power tool includes:

[0086] The housing 10 contains an output shaft 20, a drive mechanism 30, a clutch mechanism 40, a torque adjustment mechanism 50, a clutch detection mechanism 90, and a calibration mechanism.

[0087] The output shaft 20 is provided with a first thread 201. The drive mechanism 30 includes a motor 301 and a transmission assembly 302. The clutch mechanism 40 includes a first clutch disc 401, a second clutch disc 402, an elastic element 403 and a clutch assembly 404. The torque adjustment mechanism 50 includes an adjusting nut 501 and a torque adjustment gear disc 502. The adjusting nut 501 is also provided with a second thread 503.

[0088] Specifically, the motor 301 is connected to the transmission assembly 302, and the transmission assembly 302 is connected to the first clutch disc 401. The first clutch disc 401 can interruptibly transmit the torque output by the motor 301 to the second clutch disc 402 through the clutch assembly 404. The elastic element 403 is arranged around the output shaft 20. One end of the elastic element 403 biases the second clutch disc 402, and the other end of the elastic element 403 biases the torque adjustment mechanism 50. The torque adjustment mechanism 50 has a second thread 503. By cooperating with the first thread 201, the biasing force of the elastic element 403 on the second clutch disc 402 can be adjusted to realize the torque adjustment of the power tool.

[0089] In another possible implementation, the drive mechanism 30 may not include the transmission assembly 302, and directly drive the first clutch disc 401 to rotate via the motor 301, and the first clutch disc 401 may interrupt the transmission of torque to the second clutch disc 402.

[0090] In another possible implementation, the elastic element 403 can be configured as a spring arranged around the output shaft 20 (the output shaft 20 passes through the interior of the spring), or it can be configured as a plurality of springs arranged around the output shaft 20 (the plurality of springs are spaced apart on the outer periphery of the output shaft 20).

[0091] In one possible implementation, such as Figure 1 , Figure 3 , Figure 5 and Figure 6 As shown, the clutch mechanism 40 further includes a clutch assembly 404, which is configured with a plurality of clutch steel balls. The first clutch disc 401 is provided with a plurality of first grooves 4011, and the second clutch disc 402 is provided with a first slide 4021, a ramp 4022, a second slide 4023 and a step portion 4024 in sequence. The clutch steel balls are partially accommodated in the first grooves 4011. The first clutch disc 401 can interruptibly transmit torque to the second clutch disc 402 through the clutch steel balls, the ramp 4022 and the step portion 4024.

[0092] The second slide rail 4023 is arranged parallel to or inclined downwards from the ramp 4022 toward the step 4024 relative to the first plane; the first plane is the plane on the other side of the clutch disc where the second slide rail 4023 is located; specifically as follows: Figure 8 As shown, where θ ≥ 0 degrees.

[0093] It should be noted that when the clutch assembly 404 is located on the second slide rail 4023, the biasing force of the second clutch disc 402 on the elastic element 403 increases discontinuously.

[0094] Optionally, a first slide 4021, a ramp 4022, a second slide 4023, and a step 4024 may be sequentially provided on the first clutch disc 401, and a plurality of first grooves 4011 may be provided on the second clutch disc 402, with the clutch steel ball portion accommodated in the first groove 4011 (not shown in the attached figure).

[0095] In another possible implementation, such as Figure 1 , Figure 4 , Figure 5 and Figure 7 As shown, the clutch mechanism 40 also includes: a clutch assembly 404, which is integrally formed with the first clutch disc and is constructed as a hemispherical protrusion; the second clutch disc 402 is provided with a first slide 4021, a ramp 4022, a second slide 4023 and a step portion 4024 in sequence.

[0096] When the power tool is not engaged or disengaged, the hemispherical protrusion is located at the first slide 4021 and abuts against the ramp 4022. When the power tool is engaged or disengaged, the hemispherical protrusion will pass over the ramp 4022 and the step 4024 in one go.

[0097] Optionally, the clutch mechanism 40 may further include: a clutch assembly 404, which is integrally formed with the second clutch disc and is constructed as a hemispherical protrusion. The first clutch disc 402 is provided with a first slide 4021, a ramp 4022, a second slide 4023 and a step portion 4024 in sequence.

[0098] When the power tool is not engaged or disengaged, the hemispherical protrusion is located at the first slide 4021 and abuts against the ramp 4022. When the power tool is engaged or disengaged, the hemispherical protrusion will pass over the ramp 4022 and the step 4024 in one go.

[0099] In one possible implementation, such as Figure 8 As shown: The areas divided by the dashed lines on the clutch disc from right to left are the first slide 4021, the ramp 4022, the second slide 4023, and the step 4024. The clutch disc is provided with multiple sets of the first slide 4021, the ramp 4022, the second slide 4023, and the step 4024. After the clutch assembly 404 crosses the step 4024, it will re-enter the first slide 4021.

[0100] For example, when the clutch assembly 404 is in the ramp 4022, the output torque of the power tool is always less than or equal to 95% of the maximum set torque.

[0101] Optionally, when the clutch assembly 404 is located at ramp 4022, the relationship between the output torque of the power tool and the maximum set torque can be shown in Table 1 below:

[0102] Table 1

[0103]

[0104] Optionally, the height of the ramp is h1, and the height of the step is h2;

[0105] in,

[0106] In one possible implementation, the diameter of the first and second slides is d (approximately equal to the diameter of the largest steel ball that the slides can accommodate);

[0107] in,

[0108] For example, h2 = 1.1 mm, d = 3 mm.

[0109] In another possible implementation, the diameter of the first and second slides is d (approximately equal to the diameter of the largest steel ball that the slides can accommodate);

[0110] in,

[0111] For example, h2 = 1.1 mm, d = 2.7 mm.

[0112] Optionally, the duration of the reaction force exerted on the user when the power tool engages or disengages can be calculated using the following formula:

[0113] In the formula, t is the duration of the reaction force, h (h1 and h2) is the height of the upper step of the clutch disc, α is the angle between the upper step of the clutch disc and the plane (first plane) where the clutch disc is located, n is the speed of motor 301, and r is the rotation radius of the clutch assembly (i.e. the radius of the center circle formed by the slide).

[0114] In one specific embodiment, the total height h of the step section is 2mm, divided into two layers. The height h1 of the first layer slope is 1.75mm, the angle α1 between the slope and the first plane is 50°, the maximum torque point at this slope is 8Nm, the load speed n1 under this torque is 518r / min, the radius r of the central circle formed by the slide is 12.3mm, and the duration t1 of the slope reaction force is 2.2ms. The height h2 of the second layer step section is 1.1mm, the angle α2 between the second layer step section and the first plane is 57°, the maximum torque point at this step section is 12Nm, the load speed n2 under this torque is 459r / min, the radius r of the central circle formed by the slide is 12.3mm, and the duration t2 of the reaction force of the second layer step section is 1.2ms.

[0115] In another specific embodiment, the clutch disc is a conventional clutch disc, that is, it has only a single step and a slide. In this case, the height h of the step is 2mm, the angle α between the step and the plane where the clutch disc is located is 57°, the maximum torque point of the step is 12Nm, the load speed n under this torque is 459r / min, the radius r of the central circle formed by the slide is 12.3mm, and the duration of the reaction force is t=2.2ms.

[0116] It should be noted that when the clutch disc adopts a two-layer structure, the first layer of the ramp only needs to withstand 8Nm of torque, which is 30% lower than the torque when there is only one step, and the human hand can easily hold it; and under the same 12Nm of torque, the reaction force duration of the technical solution in this application embodiment is only 1.2ms, which is significantly reduced compared to the conventional solution of 2.2ms, which can effectively prevent the user from twisting their hand and improve the user experience.

[0117] In one possible implementation, such as Figure 9 As shown, when the clutch assembly 404 is located on the ramp 4022, the duty cycle of the motor 301 is greater than or equal to the duty cycle of the motor 301 when the clutch assembly 404 is located on the step 4024.

[0118] In another possible implementation, such as Figure 10As shown: The areas divided by the dotted lines on the clutch disc from right to left are the first slide, the first ramp, the second slide, the second ramp, the third slide, and the step. The clutch disc is equipped with multiple sets of the first slide, the first ramp, the second slide, the second ramp, the third slide, and the step. After the clutch assembly passes the step, it will re-enter the first slide.

[0119] For example, when the clutch assembly 404 is located at the first ramp and the second ramp, the output torque of the power tool is always less than or equal to 95% of the maximum set torque.

[0120] It should be noted that multiple ramps and steps can be set on the clutch disc to reduce the reaction force. The specific number of ramps and steps can be set according to the structural characteristics of the tool.

[0121] In one possible implementation, such as Figure 2 As shown:

[0122] The torque detection mechanism 80 can be configured as a pressure sensor 804, a plane bearing 805, and a gasket 806. The pressure sensor 804 is electrically connected to the controller and is located between the torque adjustment mechanism 50 and the elastic element 403. It is used to detect the bias force of the elastic element 403 on the torque adjustment mechanism 50. The controller then calculates the torque value of the power tool based on the detected pressure value.

[0123] Optionally, the pressure sensor 804 can also be located between the first clutch disc 401 and the elastic element 403 to detect the bias force of the elastic element 403 on the first clutch disc 401. The controller then calculates the torque value of the power tool based on the detected pressure value.

[0124] In one possible implementation, such as Figure 11 As shown, the power tool also includes a clutch detection mechanism 90, which includes a magnetic component 901, a magnetic induction component 902, a retainer 903, and a spring 904. In the initial state where the power tool is not engaged, the retainer 903 abuts against the second clutch disc 402, the magnetic component 901 is fixed to the retainer 903, and the magnetic induction component 902 is fixed to the housing 10.

[0125] In one specific embodiment, when the power tool is engaged, the second clutch disc 402 overcomes the biasing force of the elastic element 403 and undergoes axial displacement. The retainer 903 also undergoes axial displacement along with the second clutch disc 402. The magnetic component 901 on the retainer 903 can be sensed by the magnetic induction component 902 to generate a Hall signal. The controller of the power tool calculates the axial displacement of the second clutch disc 402 based on the Hall signal, thereby determining the position of the clutch assembly 404 on the first clutch disc 401 or the second clutch disc 402, and executes a stop operation or other preset operation commands according to the position. When the power tool is disengaged, the retainer 903 is reset by the spring 904.

[0126] In another possible implementation, such as Figure 1 As shown, the clutch mechanism 90 of the power tool includes: a retainer 903, a spring 904, and a pressure sensor (attached). Figure 11 (Not shown); one end of the retainer 903 abuts against the second clutch disc 402, the other end of the retainer 903 abuts against one end of the spring 904, and the other end of the spring 904 abuts against the pressure sensor.

[0127] In one specific embodiment, when the power tool is engaged, the second clutch disc 402 overcomes the biasing force of the elastic element 403 and undergoes axial displacement. The retainer 903 also undergoes axial displacement along with the second clutch disc 402, causing a change in the biasing force of the spring 904 on the pressure sensor. The controller of the power tool calculates the axial displacement of the second clutch disc 402 based on the change or magnitude of the biasing force, thereby determining the position of the clutch assembly 404 on the first clutch disc 401 or the second clutch disc 402, and executes a stop operation or other preset operation commands based on the position. When the power tool is disengaged, the retainer 903 is reset by the spring 904.

[0128] In another possible implementation, such as Figure 12 As shown, the clutch mechanism 90 of the power tool includes a pressure sensor 804, a flat bearing 805, and a gasket 806. The pressure sensor 804 is electrically connected to the controller and is located between the torque adjustment mechanism 50 and the elastic element 403. It is used to detect the bias force of the elastic element 403 on the torque adjustment mechanism 50. The controller then calculates the torque value of the power tool or the axial displacement distance of the second clutch disc 402 based on the detected pressure value.

[0129] In one specific embodiment, when the power tool engages the clutch, the second clutch disc 402 overcomes the biasing force of the elastic element 403 and undergoes axial displacement. The pressure sensor 804 can detect the magnitude or change of the biasing force of the elastic element 403 on the second clutch disc 402. The controller of the power tool calculates the axial displacement of the second clutch disc 402 based on the magnitude or change of the biasing force, thereby determining the position of the clutch assembly 404 on the first clutch disc 401 or the second clutch disc 402, and executes a stop operation or other preset operation commands based on the position.

[0130] In another possible implementation (not shown in the figures), the clutch mechanism 90 of the power tool includes: a pressure sensor 804, a plane bearing 805, and a gasket 806. The pressure sensor 804 is electrically connected to the controller and is located between the second clutch disc 402 and the elastic element 403. It is used to detect the biasing force of the elastic element 403 on the second clutch disc 402. The controller then calculates the torque value of the power tool or the axial displacement distance of the second clutch disc 402 based on the detected pressure value.

[0131] In one specific embodiment, when the power tool engages the clutch, the second clutch disc 402 overcomes the biasing force of the elastic element 403 and undergoes axial displacement. The pressure sensor 804 can detect the magnitude or change of the biasing force of the elastic element 403 on the second clutch disc 402. The controller of the power tool calculates the axial displacement of the second clutch disc 402 based on the magnitude or change of the biasing force, thereby determining the position of the clutch assembly 404 on the first clutch disc 401 or the second clutch disc 402, and executes a stop operation or other preset operation commands based on the position.

[0132] In one possible implementation, the power tool is also provided with an operating interface, which can be located on the rear shell of the housing 10 or on the base of the housing 10. The operating interface is used to input commands to control the power tool to enter the torque setting, which facilitates user operation and improves the user experience.

[0133] In one possible implementation, the power tool further includes a controller located within the housing 10 and electrically connected to the motor 301.

[0134] It should be noted that the power tool can be a DC torque wrench, an AC torque wrench, or other tools that can engage or disengage.

[0135] For example, such as Figure 13 The DC torque wrench shown includes a housing 10, an output shaft 20, and a battery pack 200. The technical solutions described above can all be applied to applications such as... Figure 13 The DC constant torque wrench shown.

[0136] Specifically, a DC torque wrench powered by a battery pack 200 may have a battery pack mounting section for mounting the battery pack 200.

[0137] In one possible implementation, the battery pack 200 is detachably mounted to the housing 10 of the DC torque wrench.

[0138] In another possible implementation, the battery pack 200 is fixedly installed in the receiving cavity formed by the housing 10, that is, the battery pack 200 is built into the DC torque wrench.

[0139] For example, such as Figure 14 The AC torque wrench shown includes a housing 10, an output shaft 20, and a power cord 300. The technical solutions described in the above embodiments can all be applied to applications such as... Figure 14 The AC torque wrench shown is shown in the diagram.

[0140] Specifically, the AC torque wrench operates by connecting to an external AC power source via a power cord 300. The power cord 300 also includes an AC plug. The arrangement of the power cord 300 can be determined based on the location of the motor or the structure and wiring of the AC torque wrench. The AC torque wrench is equipped with an AC power unit for connecting to AC power to supply power to the AC torque wrench.

[0141] In one possible implementation, the AC unit includes an AC plug and peripheral circuitry electrically connected to the AC plug; wherein the AC plug is inserted into an AC socket to access AC mains power, thereby providing a power source for the power tool.

[0142] In another possible implementation, the AC unit includes other structural forms and peripheral circuits capable of accessing AC power, such as an AC plug that is connected to AC power via a portable substation.

[0143] It should be noted that the AC power unit only needs to be able to connect to AC power; the specific structure and form are not restricted here. The AC power that the AC power unit can connect to is in the range of 110V to 130V or 210V to 230V.

[0144] This application provides an embodiment of an electric tool that divides the clutch process into multiple stages by setting a first slide 4021, a ramp 4022, a second slide 4023, and a step 4024 on the clutch disc. This reduces the reaction force generated on the user when the electric tool engages or disengages, as well as the duration of the reaction force, effectively preventing hand twisting and improving the user experience.

[0145] This application provides a functional block diagram of a control system for a power tool, such as... Figure 15As shown, the controller is powered by an external power supply. The controller controls the operation of the motor through an internal pre-driver and a three-phase inverter. The controller also includes: a current acquisition module and a current signal conditioning module for detecting the operating current of the power tool; a voltage acquisition module for detecting the voltage of the power tool; and a position signal acquisition module and a position signal conditioning module for detecting the commutation of the motor, thereby obtaining relevant parameters such as motor speed and rate.

[0146] This application provides a circuit diagram of a power tool, such as... Figure 16 As shown, the circuit includes multiple power devices MOSFET 105, motor 100, MCU 101, and acquisition module 104.

[0147] Optionally, the acquisition module 104 is used to acquire at least two mechanical parameters or at least two electrical parameters of the motor 100. The mechanical parameters include speed parameters, sector time parameters or torque parameters, and the electrical parameters include bus current parameters, phase current parameters, bus voltage parameters, power parameters, freewheeling time parameters or duty cycle parameters.

[0148] The acquisition module 104 transmits the acquired parameters to the MCU 101 for data analysis and processing, and then controls the operation of the motor according to the preset motor control strategy.

[0149] In some implementations, the speed parameter includes: speed, speed difference, or slope of the speed curve; the sector time parameter includes: sector time, sector time difference, or slope of the sector time curve; the torque parameter includes: torque, torque difference, or slope of the torque curve; the bus current parameter includes: bus current, bus current difference, or slope of the bus current curve; the phase current parameter includes: phase current, phase current difference, or slope of the phase current curve; the bus voltage parameter includes: bus voltage, bus voltage difference, or slope of the bus voltage curve; the power parameter includes: power, power difference, or slope of the power curve; the freewheeling time parameter includes: freewheeling time, freewheeling time difference, or slope of the freewheeling time curve; the duty cycle parameter includes: duty cycle parameter, duty cycle parameter difference, or slope of the duty cycle parameter curve; and the ratios of different mechanical parameters or different electrical parameters are of the same type.

[0150] The above combination Figures 1 to 16 The power tools provided in the embodiments of this application are described in detail below. Figure 17 and Figure 18 This application provides a detailed description of a method for recognizing the clutch state of an electric tool.

[0151] Figure 17 This application provides an embodiment of a clutch state recognition method for an electric tool. This clutch state recognition method can be executed by the controller in the electric tool, such as... Figure 17 As shown, the clutch state recognition method includes:

[0152] S1701, Obtain the preset signal.

[0153] The preset signals include one or more of the following: current signal, Hall effect signal, and pressure sensor signal.

[0154] It should be noted that the current signal is acquired through the acquisition module 104, while the Hall signal and pressure sensor signal can be acquired through the clutch detection mechanism in the above embodiment. For details, please refer to... Figures 1 to 16 Related embodiments will not be described in detail here.

[0155] S1702. Determine the position of the clutch assembly on the first clutch disc or the second clutch disc according to the preset signal.

[0156] Figure 18 The following diagram illustrates the current change curve when the power tool engages or disengages in an embodiment of this application. Figure 18 As shown:

[0157] The time period from 0 to t1 is the current when the clutch assembly is on the first slide rail, the time period from t1 to t2 is the current when the clutch assembly is on the ramp, the time period from t2 to t3 is the current when the clutch assembly is on the second slide rail, and the time period from t3 to t4 is the current when the clutch assembly is on the step.

[0158] Therefore, from Figure 18 The current curve shown can be used to determine the position of the clutch assembly on the first or second clutch disc by collecting the current value or the rate of change of the current.

[0159] In one possible implementation, determining the position of the clutch assembly on the first clutch disc or the second clutch disc based on the preset signal includes:

[0160] Acquire the current signal of the power tool; calculate the current change rate based on the current signal; if the current change rate is greater than or equal to the first change rate threshold, determine that the clutch assembly has crossed the ramp and is located at the second slide.

[0161] Furthermore, determining the position of the clutch assembly on the first clutch disc or the second clutch disc based on the preset signal further includes:

[0162] After determining that the clutch assembly is located at the second slide, the current signal of the power tool is acquired again; the current change rate is calculated based on the current signal; if the current change rate is greater than or equal to the second change rate threshold, it is determined that the clutch assembly has crossed the step and entered the first slide.

[0163] In another possible implementation, determining the position of the clutch assembly on the first clutch disc or the second clutch disc based on the preset signal includes:

[0164] Acquire the current signal of the power tool; determine the current value of the power tool during operation based on the current signal; if the current value is greater than or equal to the first current threshold and continues for a preset duration, determine that the clutch assembly has crossed the ramp and is located at the second slide.

[0165] Furthermore, determining the position of the clutch assembly on the first clutch disc or the second clutch disc based on the preset signal further includes:

[0166] After determining that the clutch assembly is located at the second slide, the current signal of the power tool is acquired again; the current value of the power tool during operation is determined based on the current signal; if the current value is greater than or equal to the second current threshold and continues for a preset duration, it is determined that the clutch assembly has crossed the step and entered the first slide.

[0167] In another possible implementation, determining the position of the clutch assembly on the first clutch disc or the second clutch disc based on the preset signal includes:

[0168] The axial displacement distance of the first clutch disc or the second clutch disc is calculated based on the Hall signal. If the axial displacement distance is greater than or equal to the first distance threshold and less than or equal to the second distance threshold, it is determined that the clutch assembly is located at the second slide or is crossing the step. When the axial displacement distance is equal to the second distance threshold, it is determined that the clutch assembly is located at the step.

[0169] Furthermore, determining the position of the clutch assembly on the first clutch disc or the second clutch disc based on the preset signal further includes:

[0170] The axial displacement distance of the first clutch disc or the second clutch disc is calculated based on the Hall signal; if the axial displacement distance is less than the first distance threshold, it is determined that the clutch assembly is in the process of crossing the ramp or is located at the first slide.

[0171] In another possible implementation, determining the position of the clutch assembly on the first clutch disc or the second clutch disc based on the preset signal includes:

[0172] The axial displacement distance of the first clutch disc or the second clutch disc is calculated based on the pressure sensor signal. If the axial displacement distance is greater than or equal to the first distance threshold and less than or equal to the second distance threshold, it is determined that the clutch assembly is located at the second slide or is crossing the step. When the axial displacement distance is equal to the second distance threshold, it is determined that the clutch assembly is located at the step.

[0173] Furthermore, determining the position of the clutch assembly on the first clutch disc or the second clutch disc based on the preset signal further includes:

[0174] The axial displacement distance of the first clutch disc or the second clutch disc is calculated based on the pressure sensor signal; if the axial displacement distance is less than the first distance threshold, it is determined that the clutch assembly is in the process of crossing the ramp or is located at the first slide.

[0175] In another possible implementation, determining the position of the clutch assembly on the first clutch disc or the second clutch disc based on the preset signal includes:

[0176] Acquire the current signal and Hall signal of the power tool; determine the current value of the power tool during operation based on the current signal; calculate the axial displacement distance of the first clutch disc or the second clutch disc based on the Hall signal; if the current value is greater than or equal to the first current threshold and continues for a preset time, and the axial displacement distance is greater than or equal to the first distance threshold and less than the second distance threshold, then determine that the clutch assembly is located at the second slide.

[0177] Furthermore, determining the position of the clutch assembly on the first clutch disc or the second clutch disc based on the preset signal further includes:

[0178] After determining that the clutch assembly is located at the second slide, the current signal of the power tool is acquired again; the current value of the power tool during operation is determined based on the current signal; the axial displacement distance of the first clutch disc or the second clutch disc is calculated based on the Hall signal; if the current value is greater than or equal to the second current threshold and continues for a preset time, and the axial displacement distance is less than the first distance threshold, then it is determined that the clutch assembly has crossed the step and entered the first slide.

[0179] In another possible implementation, determining the position of the clutch assembly on the first clutch disc or the second clutch disc based on the preset signal includes:

[0180] Acquire the current signal and Hall signal of the power tool; determine the current change rate during operation of the power tool based on the current signal; calculate the axial displacement distance of the first clutch disc or the second clutch disc based on the Hall signal; if the current change rate is greater than or equal to the first change rate threshold and the axial displacement distance is greater than or equal to the first distance threshold and less than the second distance threshold, then determine that the clutch assembly is located at the second slide.

[0181] Furthermore, determining the position of the clutch assembly on the first clutch disc or the second clutch disc based on the preset signal further includes:

[0182] After determining that the clutch assembly is located at the second slide, the current signal of the power tool is acquired again; the current change rate is calculated based on the current signal; the axial displacement distance of the first clutch disc or the second clutch disc is calculated based on the Hall signal; if the current change rate is greater than or equal to the second change rate threshold and the axial displacement distance is less than the first distance threshold, then it is determined that the clutch assembly has crossed the step and entered the first slide.

[0183] In another possible implementation, determining the position of the clutch assembly on the first clutch disc or the second clutch disc based on the preset signal includes:

[0184] Acquire the current signal and pressure sensor signal of the power tool; determine the current value of the power tool during operation based on the current signal; calculate the axial displacement distance of the first clutch disc or the second clutch disc based on the pressure sensor signal; if the current value is greater than or equal to the first current threshold and continues for a preset time, and the axial displacement distance is greater than or equal to the first distance threshold and less than the second distance threshold, then determine that the clutch assembly is located at the second slide.

[0185] Furthermore, determining the position of the clutch assembly on the first clutch disc or the second clutch disc based on the preset signal further includes:

[0186] After determining that the clutch assembly is located at the second slide, the current signal of the power tool is acquired again; the current value of the power tool during operation is determined based on the current signal; the axial displacement distance of the first clutch disc or the second clutch disc is calculated based on the pressure sensor signal; if the current value is greater than or equal to the second current threshold and continues for a preset time, and the axial displacement distance is less than the first distance threshold, then it is determined that the clutch assembly has crossed the step and entered the first slide.

[0187] In another possible implementation, determining the position of the clutch assembly on the first clutch disc or the second clutch disc based on the preset signal includes:

[0188] Acquire the current signal and pressure sensor signal of the power tool; determine the current change rate during operation of the power tool based on the current signal; calculate the axial displacement distance of the first clutch disc or the second clutch disc based on the pressure sensor signal; if the current change rate is greater than or equal to the first change rate threshold and the axial displacement distance is greater than or equal to the first distance threshold and less than the second distance threshold, then determine that the clutch assembly is located at the second slide.

[0189] Furthermore, determining the position of the clutch assembly on the first clutch disc or the second clutch disc based on the preset signal further includes:

[0190] After determining that the clutch assembly is located at the second slide, the current signal of the power tool is acquired again; the current change rate is calculated based on the current signal; the axial displacement distance of the first clutch disc or the second clutch disc is calculated based on the pressure sensor signal; if the current change rate is greater than or equal to the second change rate threshold and the axial displacement distance is less than the first distance threshold, then it is determined that the clutch assembly has crossed the step and entered the first slide.

[0191] It should be noted that when the second clutch disc moves axially, the magnetic component can be sensed by the magnetic induction component, thereby generating a Hall signal; the first distance threshold is the axial displacement distance of the second clutch disc when the clutch assembly crosses the ramp, and the second distance threshold is the axial displacement distance of the second clutch disc when the clutch assembly crosses the step; the axial displacement distance is the axial distance between the position of the second clutch disc when it is not engaged and the position when it is engaged.

[0192] Optionally, the preset duration can be 20ms, 50ms, 100ms or 200ms.

[0193] For example, the rate of change of current can be calculated using the following algorithm:

[0194] The collected currents are grouped, with each group including at least two adjacent current values. The average value of the current values ​​in each group is calculated to represent the current value of that group. The first derivative is calculated based on the average current. The average value can be calculated using a simple arithmetic mean, a moving average, or a combination of a simple arithmetic mean and a moving average.

[0195] For example, the rate of change of current can also be calculated using the following algorithm:

[0196] Based on the collected current, the first derivative of the current is obtained using a linear regression algorithm.

[0197] In one specific implementation, linear regression analysis can be used to calculate the slope. In a scatter plot, the best-fit line for the scatter data is defined by the equation y = a + bx, where the slope of the best-fit line can be determined as b = (∑xy - (∑x∑y) / n) / (∑xy). 2 -(∑x) 2 / n, where n is the number of data points, y is the current value, and the intercept is negligible; based on the above formula, b is obtained, such that Thus, the first derivative can be calculated, which is the rate of change of current.

[0198] For example, the rate of change of current can also be calculated using the following algorithm:

[0199] The rate of change of current is calculated using the method of successive differences; specifically, the first derivative of the parameter with respect to time. Where t nand t n-1 For two adjacent time points of the collected parameters, i n and i n-1 They are respectively at t n and t n-1 The parameters collected at that time.

[0200] It should be noted that in some embodiments, the position of the clutch assembly on the clutch disc can also be determined by the second derivative of the current.

[0201] This application provides a method for identifying the clutch state of a power tool. The method includes: acquiring a preset signal, which includes one or more of the following: a current signal, a Hall effect signal, and a pressure sensor signal; and determining the position of the clutch assembly on a first clutch disc or a second clutch disc based on the preset signal. The technical solution in this application can accurately and quickly identify the clutch state of a power tool, providing accurate clutch data for the tool, facilitating subsequent control of the tool to execute a series of preset programs, improving the intelligence of the power tool and the user experience.

[0202] The above combination Figures 1 to 16 The power tools provided in the embodiments of this application are described in detail below. Figure 19 This application provides a detailed description of a method for recognizing the clutch state of an electric tool.

[0203] Figure 19 This application provides an embodiment of a clutch control method for an electric tool. This clutch control method can be executed by the controller in the electric tool, such as... Figure 19 As shown, the clutch control method includes:

[0204] S1901. When it is detected that the power tool is engaged or disengaged and the engagement or disengagement process occurs at the second slide, the initial set torque of the power tool is obtained.

[0205] In one possible implementation, obtaining the initial set torque of the power tool includes:

[0206] The torque data stored in the storage unit of the power tool is acquired; the initial set torque of the power tool is determined based on the torque data; the torque data includes: torque set data input by the user or torque set data calculated by the controller of the power tool based on the collected torque parameters.

[0207] In one specific implementation, obtaining the initial set torque of the power tool includes:

[0208] Read the torque data stored in the power tool's storage unit; determine the initial set torque of the power tool based on the torque data;

[0209] The torque data includes: torque setting data input by the user or torque setting data calculated based on acquired sensor signals (Hall signals, pressure sensor signals).

[0210] Optionally, users can input an initial torque setting value when using the tool to adjust the torque.

[0211] Optionally, if the user does not input an initial torque value, the torque value at the time of clutch engagement is calculated using the sensor signal calculation tool and used as the set torque value.

[0212] S1902. Control the power tool to enter the preset operating mode according to the initial set torque.

[0213] The preset operating modes include one or more of the following: speed reduction, shutdown, and maintaining the original operating state.

[0214] In one possible implementation, controlling the power tool to enter a preset operating mode based on the initial set torque includes:

[0215] If the initial set torque is greater than or equal to the preset torque threshold, the power tool is controlled to stop or reduce speed; if the initial set torque is less than the preset torque threshold, the power tool is controlled to maintain its original operating state.

[0216] In another possible implementation, when the clutch engagement of the power tool is detected and the clutch engagement process occurs at the second slide, the initial set torque can be disregarded, and the power tool can be directly controlled to maintain its original operating state.

[0217] In one specific implementation, if the initial set torque is greater than or equal to a preset New York threshold, the power tool is controlled to enter a high torque operation mode.

[0218] In high torque operation mode, the motor is controlled to stop or slow down.

[0219] For example, when the initial set torque is greater than or equal to 8nm, the motor is controlled to stop or slow down.

[0220] It should be noted that the preset New York threshold is determined based on the characteristics of the power tool, such as the type of power tool and the torque adjustable range.

[0221] In one specific implementation, if the initial torque setting is less than a preset New York threshold, the power tool is controlled to enter a low torque operation mode.

[0222] In low-torque operation mode, the motor is controlled to maintain its original operating state.

[0223] For example, when the initial set torque is less than 8nm, the control motor 301 maintains its original operating state.

[0224] Optionally, different operating modes can be entered according to the initial torque setting, which can improve the user's feel when using the tool and provide a better user experience.

[0225] This application provides a clutch control method for a power tool. The method includes: when the power tool is detected to be engaging or disengaging and the clutch process occurs at the second slide, acquiring an initial set torque for the power tool; and controlling the power tool to enter a preset operating mode based on the initial set torque. The preset operating mode includes one or more of the following: speed reduction, shutdown, and maintaining the original operating state. This application, through a controller, controls the tool to enter a preset operating mode when the clutch assembly is located at the second slide based on the tool's initial set torque. This further reduces the reaction force generated on the user during tool engagement and disengagement, avoids hand twisting, and also improves the accuracy of torque output, enhancing the user experience.

[0226] This application also provides a control method for a power tool, the control method comprising:

[0227] S2001, Obtain the preset signal.

[0228] The preset signals include one or more of the following: current signal, Hall effect signal, and pressure sensor signal.

[0229] S2002. Determine the position of the clutch assembly on the first clutch disc or the second clutch disc according to the preset signal.

[0230] S2003. When it is detected that the power tool is engaged or disengaged and the engagement or disengagement process occurs at the second slide, the initial set torque of the power tool is obtained.

[0231] S2004. Control the power tool to enter the preset operating mode according to the initial set torque.

[0232] The preset operating modes include one or more of the following: speed reduction, shutdown, and maintaining the original operating state.

[0233] It should be noted that the detailed technical solutions for steps S2001-S2004 can be found in steps S1701-S1702 and S1901-S1902, and will not be repeated here.

[0234] The various embodiments or implementation methods described in this specification are presented in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0235] In the description of this specification, references to "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0236] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application 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 application.

Claims

1. A power tool, characterized in that, The power tool includes: case; The drive mechanism includes a motor for outputting power. A clutch mechanism, comprising: a first clutch disc, a second clutch disc, and an elastic element; the motor drives the first clutch disc to rotate, the first clutch disc can interruptibly transmit torque to the second clutch disc, the elastic element is arranged around the output shaft, and one end of the elastic element biases against the second clutch disc; The first clutch disc or the second clutch disc is provided with a first slide, a ramp, a second slide, and a step in sequence; the second slide is arranged parallel to or inclined downward from the ramp to the step relative to the first plane; An output shaft, which is driven to rotate by the second clutch disc; A sensor assembly located near the clutch mechanism for detecting the axial displacement of the second clutch disc; The first plane is the plane on the other side of the clutch disc where the second slide is located.

2. The power tool according to claim 1, characterized in that, The sensor assembly includes a magnetic induction component, a magnetic component, and a retainer; the retainer abuts against the second clutch disc, the magnetic component is fixed to the retainer, and the magnetic induction component is fixed to the housing.

3. The power tool according to claim 2, characterized in that, The power tool also includes a clutch assembly located between the first clutch disc and the second clutch disc; When the power tool engages the clutch, the second clutch disc overcomes the biasing force of the elastic element and undergoes axial displacement. The retainer also undergoes axial displacement along with the second clutch disc. The magnetic component on the retainer can be sensed by the magnetic induction component to generate a Hall signal. The controller of the power tool calculates the axial displacement of the second clutch disc based on the Hall signal, thereby determining the position of the clutch assembly on the first clutch disc or the second clutch disc.

4. The power tool according to claim 1, characterized in that, The sensor assembly includes a cage, a spring, and a pressure sensor; one end of the cage abuts against the second clutch disc, the other end of the cage abuts against one end of the spring, and the other end of the spring abuts against the pressure sensor.

5. The power tool according to claim 4, characterized in that, The power tool also includes a clutch assembly located between the first clutch disc and the second clutch disc; When the power tool engages the clutch, the second clutch disc overcomes the biasing force of the elastic element and undergoes axial displacement. The retainer also undergoes axial displacement along with the second clutch disc, causing a change in the biasing force of the spring on the pressure sensor. The controller of the power tool calculates the axial displacement of the second clutch disc based on the change in biasing force or the magnitude of the biasing force, thereby determining the position of the clutch assembly on the first clutch disc or the second clutch disc.

6. The power tool according to claim 1, characterized in that, The sensor assembly includes a pressure sensor located between the elastic element and the second clutch disc. When the power tool engages the clutch, the second clutch disc overcomes the biasing force of the elastic element and undergoes axial displacement. The pressure sensor can detect the magnitude or change of the biasing force of the elastic element on the second clutch disc. The controller of the power tool calculates the axial displacement of the second clutch disc based on the magnitude or change of the biasing force, thereby determining the position of the clutch assembly on the first clutch disc or the second clutch disc.

7. The power tool according to claim 1, characterized in that, The power tool also includes: A torque adjustment mechanism, comprising: an adjusting member, the adjusting member being biased by the other end of the elastic element, the adjusting member having a second thread, the adjusting member engaging with a first thread provided on the output shaft via the second thread to adjust the biasing force of the elastic element on the second clutch disc.

8. The power tool according to claim 7, characterized in that, The sensor assembly includes a pressure sensor located between the torque adjustment mechanism and the elastic element. When the power tool engages the clutch, the second clutch disc overcomes the biasing force of the elastic element and undergoes axial displacement. The pressure sensor can detect the magnitude or change of the biasing force of the elastic element on the second clutch disc. The controller of the power tool calculates the axial displacement of the second clutch disc based on the magnitude or change of the biasing force, thereby determining the position of the clutch assembly on the first clutch disc or the second clutch disc.

9. A power tool, characterized in that, The power tool includes: case; The drive mechanism includes a motor for outputting power. A clutch mechanism, comprising: a first clutch disc, a second clutch disc, and an elastic element; the motor drives the first clutch disc to rotate, the first clutch disc can interruptibly transmit torque to the second clutch disc, the elastic element is arranged around the output shaft, and one end of the elastic element biases against the second clutch disc; The first clutch disc or the second clutch disc is provided with a first slide, a ramp, a second slide, and a step in sequence; When the power tool engages or disengages, it includes a first engagement stage and a second engagement stage. During the second engagement stage, the biasing force of the elastic element on the first or second clutch disc never increases. The first clutch phase occurs in the first slide rail, and the second clutch phase occurs in the second slide rail; An output shaft, which is driven to rotate by the second clutch disc; A sensor assembly, located near the clutch mechanism, is used to detect the axial displacement of the second clutch disc.

10. A DC constant torque wrench, characterized in that, The DC constant torque wrench includes: case; A drive mechanism, comprising: a motor and a transmission assembly; the motor being connected to the transmission assembly to transmit power; A battery pack is used to power the motor; A clutch mechanism, comprising: a first clutch disc, a second clutch disc, and an elastic element; the motor drives the first clutch disc to rotate, the first clutch disc can interruptibly transmit torque to the second clutch disc, the elastic element is arranged around the output shaft, and one end of the elastic element biases against the second clutch disc; A first slide, a ramp, a second slide, and a step are sequentially provided on one side of the first clutch disc or the second clutch disc; the second slide is arranged parallel to or inclined downward from the ramp toward the step relative to the first plane. An output shaft, which is driven to rotate by the second clutch disc; A sensor assembly located near the clutch mechanism for detecting the axial displacement of the second clutch disc; The first plane is the plane on the other side of the first clutch disc or the second clutch disc.

11. An AC torque-controlled wrench, characterized in that, The AC torque wrench includes: case; A drive mechanism, comprising: a motor and a transmission assembly; the motor being connected to the transmission assembly to transmit power; A clutch mechanism, comprising: a first clutch disc, a second clutch disc, and an elastic element; the motor drives the first clutch disc to rotate, the first clutch disc can interruptibly transmit torque to the second clutch disc, the elastic element is arranged around the output shaft, and one end of the elastic element biases against the second clutch disc; The first clutch disc or the second clutch disc is provided with a first slide, a ramp, a second slide, and a step in sequence; When the power tool engages or disengages, it includes a first engagement stage and a second engagement stage. During the second engagement stage, the biasing force of the elastic element on the first or second clutch disc never increases. The first clutch phase occurs in the first slide rail, and the second clutch phase occurs in the second slide rail; An output shaft, which is driven to rotate by the second clutch disc; A sensor assembly, located near the clutch mechanism, is used to detect the axial displacement of the second clutch disc.

Images