Impact drill

Abstract

This utility model relates to an impact drill, comprising: an output shaft; a transmission housing with a first protrusion on its outer wall; an adjusting nut screwed onto the outer periphery of the transmission housing and having a second protrusion on its inner wall; a mode switching component movably sleeved on the outer periphery of the output shaft; and an adjusting sleeve in which the adjusting nut is non-rotatably installed, allowing axial movement of the adjusting nut relative to the adjusting sleeve. When the adjusting nut is in the impact stop position, the first protrusion abuts against the second protrusion along a first direction to prevent the adjusting nut from spiraling backward and disengaging from the impact stop position. When the force applied to the adjusting nut along a second direction exceeds the resistance of the first protrusion, the second protrusion can pass over the first protrusion. In this impact drill, when the adjusting nut is in the impact stop position, the first protrusion on the transmission housing acts as a stop against the second protrusion on the adjusting nut, thereby preventing the adjusting nut from spiraling backward.

Description

Technical Field

[0001] This utility model relates to the field of power tool technology, and in particular to an impact drill. Background Technology

[0002] Impact drills typically have several operating modes: screw mode, drill mode, and impact mode. The impact drill drives the tool head (such as a screwdriver or drill bit) to perform the corresponding operation via its output shaft. Impact drills are equipped with an adjusting sleeve, an adjusting nut, and a mode switch. Operation is achieved by rotating the adjusting sleeve to switch between screw mode, drill mode, and impact mode. For these three operating modes, the adjusting sleeve usually has a first stop position, a second stop position, and a third stop position.

[0003] With the adjusting sleeve between the first and second stop positions, the impact drill is in screw mode. At this time, the operator can rotate the adjusting sleeve forward to drive the adjusting nut to move axially backward. By moving the adjusting nut axially backward, the tripping torque of the impact drill's clutch mechanism can be adjusted. When the torque applied to the output shaft by the drill bit exceeds the tripping torque, the clutch mechanism will cut off the torque output transmitted to the output shaft, causing tripping.

[0004] When the adjusting sleeve continues to rotate forward to the second stop position, the impact drill is in drill mode and the mode switching component is in the first position. At this time, the clutch mechanism will not cut off the torque output transmitted to the output shaft, and the output shaft can output the maximum torque to maintain the gear without skipping. During the rotation of the adjusting sleeve, the adjusting nut continues to move backward.

[0005] As the adjusting sleeve continues to rotate forward to the third stop position, it will drive the mode switching component to rotate from the first position to the second position, thereby switching the impact drill to the impact mode. When the adjusting sleeve rotates to the third stop position, it can no longer continue to rotate forward.

[0006] The impact drill is equipped with an elastic plate, and the elastic sound plate has a stop protrusion. The inner wall of the adjusting sleeve has multiple stop grooves. At the first, second, and third stop positions of the adjusting sleeve, the stop protrusion engages with the corresponding stop groove, allowing the adjusting sleeve to be in the corresponding stop position. Simultaneously, the stop protrusion and the stop groove produce an impact sound, serving as an audible alert. However, in impact mode, the machine vibrates significantly, and the stop protrusion of the elastic sound plate can easily detach from the stop groove, causing the stopping function of the adjusting sleeve to fail. Utility Model Content

[0007] Based on the aforementioned deficiencies in the prior art, the purpose of this utility model is to provide an impact drill. By providing a first protrusion on the outer wall of the transmission housing and a second protrusion on the inner wall of the adjusting nut, when the adjusting nut is in the impact stop position, the first protrusion can prevent the second protrusion from retracting, thereby preventing the adjusting nut from spiraling backward, which is beneficial for the impact drill to be stably in the impact mode.

[0008] Therefore, the present invention provides the following technical solution.

[0009] This utility model provides an impact drill, the impact drill comprising:

[0010] Output shaft, which drives the tool head to work;

[0011] A transmission housing for accommodating a transmission mechanism, and its outer wall is provided with a first protrusion;

[0012] An adjusting nut is screwed onto the outer periphery of the transmission housing, and its inner wall is provided with a second protrusion;

[0013] A mode switching component, which is movably sleeved on the outer periphery of the output shaft;

[0014] An adjusting sleeve, wherein the adjusting nut is non-rotatably installed in the adjusting sleeve, and the adjusting nut is axially movable relative to the adjusting sleeve;

[0015] When the adjusting sleeve rotates in the first direction to drive the mode switching component to rotate from the first position to the second position, the adjusting nut can spiral forward from the drill stop position to the impact stop position.

[0016] Specifically, when the adjusting nut is in the impact stop position, the first protrusion abuts against the second protrusion along the first direction to prevent the adjusting nut from spiraling backward and disengaging from the impact stop position; when the force applied to the adjusting nut along the second direction is greater than the resistance of the first protrusion, the second protrusion can pass over the first protrusion; the first direction is opposite to the second direction.

[0017] Optionally, the adjusting nut further has a screw stop position, and the adjusting sleeve drives the adjusting nut to spiral forward from the screw stop position to the drill stop position by rotating in the first direction.

[0018] The outer wall of the transmission housing is also provided with a third protrusion, and the adjusting nut is also provided with a fourth protrusion;

[0019] When the adjusting nut is in the drill stop position, the third protrusion abuts against the fourth protrusion in the first direction to prevent the adjusting nut from spiraling backward and disengaging from the drill stop position; when the force applied to the adjusting nut in the second direction is greater than the resistance of the third protrusion, the fourth protrusion can pass over the third protrusion.

[0020] Optionally, the first protrusion and the third protrusion are spaced apart along the axial direction of the adjusting nut.

[0021] Optionally, the number of the first protrusions is at least two, and the second protrusions are configured in a one-to-one correspondence with the first protrusions.

[0022] Optionally, the transmission housing includes an annular column, and the first protrusion is provided on the outer wall of the annular column;

[0023] All the first protrusions are arranged in an array along the circumference of the annular column.

[0024] Optionally, the number of the third protrusions is at least two, and the fourth protrusions are provided in a one-to-one correspondence with the third protrusions.

[0025] Optionally, the transmission housing includes an annular column, and the third protrusion is disposed on the outer wall of the annular column;

[0026] All of the third protrusions are arranged in an array along the circumference of the annular column.

[0027] Optionally, the transmission housing is provided with external threads, and the adjusting nut is provided with matching internal threads;

[0028] The first protrusion and the third protrusion are respectively located on the outer surface of the thread protrusion of the external thread, and the second protrusion and the fourth protrusion are respectively located on the bottom wall of the thread groove of the internal thread.

[0029] Optionally, the number of the first protrusion and the number of the third protrusion are equal;

[0030] The first protrusion and the third protrusion are spaced apart along the axial direction of the adjusting nut, and are directly opposite each other in the axial direction.

[0031] Optionally, one of the first protrusions and one of the second protrusions are respectively configured to form a set of impact stop anti-reverse structures, and one of the third protrusions and one of the fourth protrusions are respectively configured to form a set of drill stop anti-reverse structures; the set of impact stop anti-reverse structures and the set of drill stop anti-reverse structures constitute a set of double stop anti-reverse structures.

[0032] The fit between the transmission housing, the adjusting nut, and the adjusting sleeve conforms to the following formula:

[0033]

[0034] Wherein, the minimum axial distance between the highest point of the first protrusion and the lowest point of the second protrusion, and the minimum axial distance between the highest point of the third protrusion and the lowest point of the fourth protrusion are both H;

[0035] L represents the lead of the thread between the transmission housing and the adjusting nut, α represents the interior angle between the third and fourth protrusions in the same group when the impact drill is in screw mode, β represents the angle of rotation of the adjusting sleeve when the impact drill switches from drill mode to impact mode, θ represents the maximum angle that the adjusting sleeve can rotate, and n represents the number of groups of the double-speed anti-backward structure.

[0036] This utility model has the following technical effects:

[0037] This utility model provides an impact drill. By setting a first protrusion on the outer wall of the transmission housing and a second protrusion on the inner wall of the adjusting nut, when the adjusting nut is in the impact stop position, the first protrusion can prevent the second protrusion from retracting, thereby preventing the adjusting nut from spiraling backward. This is beneficial for the impact drill to be stably in the impact mode, and the adjusting nut is not easy to retract, ensuring that the mode can be switched stably. Attached Figure Description

[0038] Figure 1 This is a three-dimensional structural diagram of the impact drill of this utility model;

[0039] Figure 2 This is a cross-sectional view of the impact drill of this utility model;

[0040] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0041] Figure 4 This is a side view showing the structural relationship between the output shaft, transmission housing, and adjusting nut when the adjusting nut is in the initial position according to this utility model.

[0042] Figure 5 This is a side view showing the structural relationship between the output shaft, transmission housing, and adjusting nut when the adjusting nut is in the drill stop position according to this utility model.

[0043] Figure 6 This is a side view showing the structural relationship between the output shaft, transmission housing, and adjusting nut when the adjusting nut is in the impact stop position according to this utility model.

[0044] Figure 7 This is a three-dimensional structural diagram of the output shaft, transmission housing, and adjusting nut when the adjusting nut is in the impact stop position according to this utility model.

[0045] Figure 8 This is an exploded view of a partial structure of the impact drill of this utility model;

[0046] Figure 9 This is a three-dimensional structural diagram of the transmission housing of this utility model;

[0047] Figure 10 This is a three-dimensional structural diagram of the adjusting nut of this utility model;

[0048] Figure 11 This is a three-dimensional structural diagram of the adjusting sleeve of this utility model.

[0049] Explanation of reference numerals in the attached figures

[0050] 100. Impact drill;

[0051] 1. Output shaft;

[0052] 2. Transmission housing; 21. First protrusion; 22. Third protrusion; 23. External thread; 231. End of the first thread groove; 24. Annular column; 25. Notch; 251. First abutment part; 252. Second abutment part;

[0053] 31. Adjusting nut; 311. Second protrusion; 312. Fourth protrusion; 313. Internal thread; 3131. End of first thread protrusion; 314. Limiting protrusion;

[0054] 32. Mode switching component; 321. Extension arm;

[0055] 33. Adjusting sleeve; 331. Anti-reverse groove; 332. Actuating part; 333. Limiting groove;

[0056] 4. Transmission mechanism; 5. Motor;

[0057] 6. Elastic sound plate; 61. Protrusion;

[0058] 71. Stationary ratchet; 72. Moving ratchet;

[0059] 8. Front bearing. Detailed Implementation

[0060] To make the technical solution and beneficial effects of this utility model more apparent and understandable, a detailed description is provided below by listing specific embodiments. 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.

[0061] In the description of this utility model, unless otherwise expressly defined, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of simplifying the description of this utility model and do not indicate that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. That is, they should not be construed as limitations on this utility model.

[0062] In this utility model, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating the relative importance of the indicated features or the number of indicated technical features. Therefore, a feature specified as "first" or "second" can explicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two; "several" means at least one; unless otherwise expressly defined.

[0063] In this utility model, unless otherwise explicitly defined, the terms "installation," "connection," "linking," "fixing," and "setting," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral molding; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can also refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0064] In this utility model, unless otherwise explicitly defined, the terms "above," "on top of," "above," "over," "below," "below," "below," or "below" for "first feature above second feature" can refer to direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Furthermore, "above," "above," and "over" for "first feature above second feature" can mean the first feature is directly above or diagonally above the second feature, or simply indicates that the horizontal height of the first feature is higher than the horizontal height of the second feature. Similarly, "below," "below," and "below" for "first feature below second feature" can mean the first feature is directly below or diagonally below the second feature, or simply indicates that the horizontal height of the first feature is lower than the horizontal height of the second feature.

[0065] In this utility model, "front," "rear," "left," "right," "up," and "down" all refer to... Figure 1 The markings in the diagram shall prevail; "first direction a" and "second direction b" shall be based on the given markings. Figure 7 The markings in the text shall prevail.

[0066] The following is based on Figures 1 to 11 This invention relates to an impact drill.

[0067] In this embodiment, such as Figures 1 to 3 , Figure 8 As shown, the impact drill 100 includes an output shaft 1, a transmission housing 2, an adjusting nut 31, a mode switch 32, an adjusting sleeve 33, a transmission mechanism 4, and a motor 5. The transmission housing 2 houses the transmission mechanism 4. One end of the output shaft 1 is engaged with the transmission mechanism 4, and the other end is used for detachable mounting of a tool head (such as a drill bit). The transmission mechanism 4 is typically a planetary gear system. The transmission mechanism 4 reduces the rotational speed output by the output shaft 1 and then transmits the rotational power to the output shaft 1, thereby driving the tool head to operate.

[0068] The adjusting nut 31 is non-rotatably installed in the adjusting sleeve 33. The adjusting nut 31 can move axially relative to the adjusting sleeve 33. The adjusting nut 31 is screwed to the outer periphery of the transmission housing 2. Thus, when the adjusting sleeve 33 rotates, the adjusting sleeve 33 will drive the adjusting nut 31 to rotate. Furthermore, under the helical engagement between the adjusting nut 31 and the transmission housing 2, the adjusting nut 31 will also move axially relative to the adjusting sleeve 33, thereby causing the adjusting nut 31 to undergo helical motion.

[0069] The mode switching component 32 is movably sleeved on the outer periphery of the output shaft 1. During the process of switching the impact drill 100 from the drill mode to the impact mode, the adjusting sleeve 33 is not only linked with the adjusting nut 31, but also with the mode switching component 32. Specifically, when the adjusting sleeve 33 rotates along the first direction a to drive the mode switching component 32 to rotate from the first position to the second position, the adjusting nut 31 can spirally advance from the drill stop position to the impact stop position. That is, when the mode switching component 32 is in the first position, the adjusting nut 31 is in the drill stop position. At this time, the impact drill 100 is in the drill mode, and the output shaft 1 can drive the tool head to rotate to realize drilling. When the mode switching component 32 is in the second position, the adjusting nut 31 is in the impact stop position. At this time, the impact drill 100 is in the impact mode, and the output shaft 1 can drive the tool head to rotate while also driving the tool head to reciprocate axially to realize impact.

[0070] like Figures 8 to 10As shown, the outer wall of the transmission housing 2 is provided with a first protrusion 21, and the inner wall of the adjusting nut 31 is provided with a second protrusion 311. When the adjusting nut 31 is in the drill stop position, the first protrusion 21 and the second protrusion 31 are spaced apart in the axial direction of the output shaft 1, and the spiral movement of the adjusting nut 31 is not restricted by the first protrusion 21. As the adjusting nut 31 spirals forward from the drill stop position to the impact stop position, the second protrusion 311 spirals forward along with it. The distance between the second protrusion 311 and the first protrusion 21 in the axial direction of the output shaft 1 gradually decreases, and the relative positions of the second protrusion 311 and the first protrusion 21 in the circumferential direction of the output shaft 1 also change. When the adjusting nut 31 is in the impact stop position, it stops spiraling forward. At this time, the first protrusion 21 abuts against the second protrusion 311 along the first direction a (i.e., the second protrusion 311 abuts against the first protrusion 21 along the second direction b). Thus, the first protrusion 21 prevents the second protrusion 311 from rotating along the second direction b, thereby preventing the adjusting nut 31 from spiraling backward and disengaging from the impact stop position. The first direction a is opposite to the second direction b. When the force applied to the adjusting nut 31 along the second direction b is greater than the resistance of the first protrusion 21, the second protrusion 311 can pass over the first protrusion 21, allowing the adjusting nut 31 to disengage from the impact stop position and spiral backward towards the drill stop position.

[0071] The above technical solution, by setting a first protrusion 21 on the outer wall of the transmission housing 2 and a second protrusion 311 on the inner wall of the adjusting nut 31, when the adjusting nut 31 is in the impact stop position, the first protrusion 21 can play a role in preventing the second protrusion 311 from retracting, thereby preventing the adjusting nut 31 from spiraling backward. This is beneficial for the impact drill 100 to be stably in the impact mode, and the adjusting nut is not easy to retract, ensuring that the mode can be switched stably. Furthermore, since the adjusting nut 31 is non-rotatably installed in the adjusting sleeve 33, it can prevent the adjusting sleeve 33 from retracting.

[0072] In one implementation, such as Figure 3 and Figure 8 As shown, the impact drill 100 also includes a stationary ratchet 71, a moving ratchet 72, and a front bearing 8. The front part of the output shaft 1 is connected to the inner wall of the transmission housing 2 via the front bearing 8. The front bearing 8, mode switching component 32, moving ratchet 72, and stationary ratchet 71 are distributed from front to back along the impact drill 100. The moving ratchet 71 is fixedly sleeved on the output shaft 1, and the stationary ratchet 71 is installed on the inner wall of the transmission housing 2. The output shaft 1 can move axially through the stationary ratchet 71. Figure 7 , Figure 8 and Figure 11As shown, the inner wall of the adjusting sleeve 33 is provided with a toggle part 332, the mode switching component 32 is provided with an extension arm 321, and the front end of the transmission housing 2 is provided with a notch 25. The notch 25 includes a first abutment part 251 and a second abutment part 252 that are staggered along a first direction a. The first abutment part 251 and the second abutment part 252 are staggered along a front-to-back direction, that is, the first abutment part 251 is located in front of the second abutment part 252. Figure 5 As shown, when the impact drill 100 is in drill mode, the mode switching component 32 is in the first position. The front bearing 8 and the moving ratchet 72 together clamp the mode switching component 32. There is a gap between the moving ratchet 72 and the stationary ratchet 71. Furthermore, the first abutting part 251 abuts against the extension arm 321 to prevent the mode switching component 32 from moving axially backward, thereby allowing the output shaft 1 to move axially backward, thus preventing the moving ratchet 72 from contacting the stationary ratchet 71. In addition, the actuating part 332 abuts against the extension arm 321 along the first direction a. When the adjusting sleeve 33 rotates along the first direction a, the actuating part 332 will push the extension arm 321 to rotate synchronously, thereby causing the mode switching component 32 to rotate to the second position, such as... Figure 6 and Figure 7 As shown, there is a gap between the extension arm 321 and the second abutment part 252. This gap allows the mode switching component 32 to move axially backward. Thus, when the output shaft 1 is subjected to a large reaction force from the workpiece (such as a wall), the mode switching key 32 and the moving ratchet 72 will move axially backward along with the output shaft 1. The moving ratchet 72 will contact the stationary ratchet 71 and the two will cooperate, thereby switching the impact drill 100 to the impact mode.

[0073] In one implementation, such as Figure 10 and Figure 11 As shown, the adjusting nut 31 has a limiting protrusion 314 on its outer periphery, and the adjusting sleeve 33 has a limiting groove 333 on its inner wall. The limiting groove 333 extends along the axial direction of the output shaft 1, and the limiting protrusion 314 is movably inserted into the limiting groove 333. When the adjusting sleeve 33 rotates, under the screw connection between the adjusting nut 31 and the transmission housing 2, and under the sliding connection between the limiting protrusion 314 and the limiting groove 333, the adjusting nut 31 will undergo a spiral motion driven by the adjusting sleeve 33.

[0074] In one implementation, such as Figure 8 and Figure 11As shown, the impact drill 100 also includes a flexible sound plate 6, which is located between the transmission housing 2 and the adjusting sleeve 33. The flexible sound plate 6 is installed on the outer wall of the transmission housing 2. The flexible sound plate 6 has a protrusion 61, and the inner wall of the adjusting sleeve 33 has multiple anti-reverse grooves 331. All the anti-reverse grooves 331 are distributed sequentially along the rotation direction of the adjusting sleeve 33. When the adjusting sleeve 33 is in the corresponding stop position, the protrusion 61 engages with the corresponding anti-reverse groove 331 to restrict the adjusting sleeve 33 to the current stop position. When the force of rotating the adjusting sleeve 33 is greater than the engagement resistance of the anti-reverse groove 331 on the protrusion 61, the adjusting sleeve 33 can rotate smoothly. When the protrusion 61 rotates to the next anti-reverse groove 331, the adjusting sleeve 33 stops, providing a gear shift feel. At the same time, when the protrusion 61 inserts into the anti-reverse groove 331, the two produce a collision sound, which serves as an audible prompt. In this design, when the impact drill 100 is in impact mode, the first protrusion 21 and the second protrusion 311 cooperate to provide a primary anti-reverse function. At the same time, the elastic sound plate 6 cooperates with the anti-reverse groove 331 to provide a secondary anti-reverse function, so as to further ensure that the impact drill 100 can be stably in impact mode.

[0075] In one embodiment, the adjusting nut 31 also has a screw stop position. The adjusting sleeve 33 rotates along a first direction a to drive the adjusting nut 31 spirally forward from the screw stop position to the drill stop position. During this process, the actuating part 32 of the adjusting sleeve 33 does not contact the extension arm 321 of the mode switching member 32, so that the mode switching member 32 remains in the first position. Specifically, the screw stop typically has multiple positions, such as... Figure 4 As shown, the first screw stop position is the initial position of the adjusting nut 31. The adjusting nut 31 has multiple screw stop positions. The impact drill 100 is in screw stop mode and has multiple screw stop positions. Since the adjusting nut 31 has many screw stop positions, and it is not advisable to set too many protrusions on the transmission housing and the adjusting nut, mutual interference will occur between the various positions. Therefore, the anti-backlash function between different screw stop positions can be achieved by the elastic sound plate 6 cooperating with the anti-backlash groove 331 on the adjusting sleeve 33.

[0076] like Figures 8 to 10As shown, the outer wall of the transmission housing 2 is also provided with a third protrusion 22. The third protrusion 22 and the first protrusion 21 are distributed sequentially along the forward direction of the adjusting nut 31 as it spirals forward. The adjusting nut 31 is also provided with a fourth protrusion 312. When the adjusting nut 31 is in the screw stop position, the third protrusion 22 and the fourth protrusion 312 are spaced apart in the axial direction of the output shaft 1, and the spiral movement of the adjusting nut 31 is not restricted by the third protrusion 22. During the process of the adjusting nut 31 spiraling forward from the screw stop position to the drill stop position, the fourth protrusion 312 spirals forward along with it. When the adjusting nut 31 is in the drill stop position, the third protrusion 22 abuts against the fourth protrusion 312 along the first direction a (that is, the fourth protrusion 312 abuts against the third protrusion 22 along the second direction b). In this way, the third protrusion 22 can prevent the fourth protrusion 312 from rotating along the second direction b, thereby preventing the adjusting nut 31 from spiraling backward and disengaging from the drill stop position. When the force applied to the adjusting nut 31 along the second direction b is greater than the resistance of the third protrusion 22, the fourth protrusion 312 can pass over the third protrusion 22, thereby allowing the adjusting nut 31 to disengage from the drill stop position and spiral backward toward the screw stop position. In this design, by setting the third protrusion 22 on the outer wall of the transmission housing 2 and the fourth protrusion 312 on the inner wall of the adjusting nut 31, the third protrusion 22 limits the fourth protrusion 312, which helps the impact drill 100 to stably remain in the drill stop position and prevents it from retracting.

[0077] It should be understood that by limiting the positional relationship between the second protrusion 311 and the fourth protrusion 312, interference between the second protrusion 311 and the third protrusion 22, or between the fourth protrusion 312 and the first protrusion 21, can be avoided during the rotation of the adjusting nut 31.

[0078] It should be understood that the switching principles of the spiral mode, drill mode and impact mode of the impact drill 100 in this article can refer to existing impact drills, such as the mode switching principle disclosed in the patent with announcement number CN221561227U, which will not be repeated in this article.

[0079] It should be understood that "spiral forward" in this text refers to the direction in which the adjusting nut 31 moves toward the impact stop position, and "spiral backward" refers to the direction opposite to "spiral forward". It should be understood that when the impact drill 100 is operating, the direction in which the output shaft 1 faces the workpiece is forward, and "spiral forward" is a spiral movement toward the rear of the impact drill 100.

[0080] In one specific embodiment, when the adjusting nut 31 is in the drill stop position, the third protrusion 22 and the fourth protrusion 312 cooperate to provide a primary anti-reverse function. Simultaneously, the elastic acoustic plate 6 cooperates with the anti-reverse groove 331 to provide a secondary anti-reverse function. When the adjusting nut 31 needs to be screwed back, the rotational force applied by the adjusting sleeve 33 to the adjusting nut 31 must be greater than the resistance of the third protrusion 22 against the fourth protrusion 312, and also greater than the locking resistance of the anti-reverse groove 331 against the protrusion 61. When the adjusting nut 31 is in the impact stop position, the first protrusion 21 and the second protrusion 311 cooperate to provide a primary anti-reverse function. Simultaneously, the elastic acoustic plate 6 cooperates with the anti-reverse groove 331 to provide a secondary anti-reverse function. When the adjusting nut 31 needs to be screwed back, the rotational force applied by the adjusting sleeve 33 to the adjusting nut 31 must be greater than the resistance of the first protrusion 21 against the second protrusion 311, and also greater than the locking resistance of the anti-reverse groove 331 against the protrusion 61.

[0081] In one implementation, such as Figure 8 and Figure 9 As shown, the first protrusion 21 and the third protrusion 22 are spaced apart along the axial direction of the adjusting nut 31. By limiting the distance between the first protrusion 21 and the third protrusion 22 in the axial direction of the adjusting nut 31, and limiting the size of the second protrusion 311 on the adjusting nut 31, the second protrusion 311 can easily pass through the gap between the first protrusion 21 and the third protrusion 22 during the process of the adjusting nut 31 spiraling forward from the drill stop position to the impact stop position. This allows the second protrusion 311 to abut against the first protrusion 21 along the second direction b, thereby enabling the first protrusion 21 to smoothly stop the second protrusion 311 from regressing.

[0082] In one implementation, such as Figure 8 and Figure 9 As shown, there are at least two first protrusions 21, and each second protrusion 311 corresponds to one of the first protrusions 21. A set of impact stop structures is formed by one first protrusion 21 and one second protrusion 311. Specifically, since the transmission housing 2 is screwed to the adjusting nut 31, there will be a gap between them. If only one set of impact stop structures is provided, when the first protrusion 21 and the second protrusion 311 abut, the adjusting nut 31 may shift its axis under the contact of the first protrusion 21, thus weakening the anti-backlash effect of the first protrusion 21 on the second protrusion 311. This solution, by configuring multiple sets of impact stop structures, helps to balance the force on the adjusting nut 31, minimizes the offset of the adjusting nut 31's axis, improves the stability of the anti-backlash, and reduces the wear between the first protrusion 21 and the second protrusion 311.

[0083] Furthermore, the transmission housing 2 includes an annular column 24, with first protrusions 21 disposed on the outer wall of the annular column 24. All the first protrusions 21 are arranged in an array along the circumference of the annular column 24, which further facilitates the balanced force distribution on the adjusting nut 31, minimizes the offset of the adjusting nut 31 axis, further improves the stability of the anti-reverse mechanism, and reduces the wear between the first protrusions 21 and the second protrusions 311. Preferably, there are two first protrusions 21 and two second protrusions 311, and the two first protrusions 21 are symmetrically arranged about the central axis of the annular column 24, which can improve the stability of the anti-reverse mechanism and also helps to simplify the structure of the transmission housing 2 and the adjusting nut 31.

[0084] In one implementation, such as Figure 8 and Figure 10 As shown, there are at least two third protrusions 22, and a corresponding fourth protrusion 312 is provided for each third protrusion 22. Each third protrusion 22 and each fourth protrusion 312 forms a set of drill stop anti-reverse structures. Specifically, since the transmission housing 2 is screwed to the adjusting nut 31, there will be a gap between them. Therefore, if only one set of drill stop anti-reverse structures is provided, when the third protrusion 22 and the fourth protrusion 312 abut against each other, the adjusting nut 31 may experience axial displacement due to the contact of the third protrusion 22, thus weakening the anti-reverse effect of the third protrusion 22 on the fourth protrusion 312. This solution, by configuring multiple sets of drill stop anti-reverse structures, helps to balance the force on the adjusting nut 31, minimizes axial displacement of the adjusting nut 31, improves the stability of the anti-reverse mechanism, and reduces the wear between the third protrusion 22 and the fourth protrusion 312.

[0085] Furthermore, the transmission housing 2 includes an annular column 24, with third protrusions 22 disposed on the outer wall of the annular column 24. All the third protrusions 22 are arranged in an array along the circumference of the annular column 24, which further facilitates the balanced force distribution on the adjusting nut 31, minimizes the offset of the adjusting nut 31's axis, further improves the stability of the anti-reverse mechanism, and reduces the degree of wear between the third protrusions 22 and the fourth protrusions 312. Preferably, there are two third protrusions 22 and two fourth protrusions 312, which are symmetrically arranged about the central axis of the annular column 24. This improves the stability of the anti-reverse mechanism and also simplifies the structure of the transmission housing 2 and the adjusting nut 31.

[0086] In one implementation, such as Figure 3 , Figures 8 to 10As shown, the transmission housing 2 is provided with an external thread 23, and the adjusting nut 31 is provided with a matching internal thread 313. The external thread 23 and the internal thread 313 are threadedly engaged so that the transmission housing 2 is screwed to the adjusting nut 31. The first protrusion 21 and the third protrusion 22 are respectively provided on the outer surface of the thread protrusion of the external thread 23, and the second protrusion 311 and the fourth protrusion 312 are respectively provided on the bottom wall of the groove of the internal thread 313.

[0087] It should be understood that by defining the positions of the first protrusion 21, the second protrusion 311, the third protrusion 22, and the fourth protrusion 312, interference with the threaded engagement of the external thread 23 and the internal thread 313 can be avoided. In one specific embodiment, the internal thread 313 includes the end section 3131 of the first thread protrusion, which is located at the end of the internal thread 313 near the motor 5. The second protrusion 311 and the fourth protrusion 312 are both located near the end section 3131 of the first thread protrusion.

[0088] Furthermore, the number of the first protrusion 21 and the third protrusion 22 are equal, and correspondingly, the number of the second protrusion 311 and the fourth protrusion 312 are equal. For example... Figure 9 and Figure 10 As shown, the first protrusion 21 and the third protrusion 22 are spaced apart along the axial direction of the adjusting nut 31 and are directly opposite each other in the axial direction. The second protrusion 311 and the fourth protrusion 312 are spaced apart along the rotation direction of the adjusting nut 31.

[0089] Furthermore, a first protrusion 21 and a second protrusion 311 are respectively configured to form a set of impact stop anti-reverse structures, and a third protrusion 22 and a fourth protrusion 312 are respectively configured to form a set of drill stop anti-reverse structures; the set of impact stop anti-reverse structures and the set of drill stop anti-reverse structures constitute a set of double stop anti-reverse structures.

[0090] The fit between the transmission housing 2, the adjusting nut 31, and the adjusting sleeve 33 conforms to the following formula:

[0091]

[0092] The minimum axial distance between the highest point of the first protrusion 21 and the lowest point of the second protrusion 311, and the minimum axial distance between the highest point of the third protrusion 22 and the lowest point of the fourth protrusion 312 are both H.

[0093] L represents the lead of the thread between the transmission housing 2 and the adjusting nut 31, α represents the interior angle between the third protrusion 22 and the fourth protrusion 312 in the same group when the impact drill 100 is in the screw gear, β represents the angle of rotation of the adjusting sleeve 33 when the impact drill 100 switches from the drill gear to the impact gear, θ represents the maximum angle that the adjusting sleeve 33 can rotate, and n represents the number of groups of the double-gear anti-backward structure.

[0094] In one specific embodiment, the impact drill 100 is equipped with two sets of double-stop structures, where n is 2. Two first protrusions 21 are symmetrically arranged about the axis of the annular post 24, two third protrusions 22 are symmetrically arranged about the axis of the annular post 24, two second protrusions 311 are symmetrically arranged about the rotation axis of the adjusting nut 31, and two fourth protrusions 312 are symmetrically arranged about the rotation axis of the adjusting nut 31. One second protrusion 311 and one fourth protrusion 312 are positioned close to each other on one side of the annular post 24, while the other second protrusion 311 and the other fourth protrusion 312 are positioned close to each other on the other side of the annular post 24. For example... Figure 10 As shown, the second protrusion 311 and the fourth protrusion 312, which are located close to each other, are distributed sequentially along the first direction a. In this way, when the adjusting nut 31 spirals forward toward the drill stop position, the fourth protrusion 312 moves first to abut against the third protrusion 22. At this time, the second protrusion 311 does not contact the first protrusion 21 or the third protrusion 22. Then, if the adjusting nut 31 continues to spiral forward, the second protrusion 311 can move smoothly to abut against the first protrusion 21.

[0095] In one implementation, such as Figure 9 As shown, the external thread 23 includes a first thread groove end section 231, which is located at the end of the external thread 23 closest to the motor 5. One end of the first protrusion 21 is coplanar with the groove wall of the first thread groove end section 231. During the spiral movement of the adjusting nut 31 from the drill stop position to the impact stop position, as... Figure 9 and Figure 10 As shown, the first threaded protrusion 3131 of the adjusting nut 31 moves into the first threaded groove 231, so that the first protrusion 21 abuts against the second protrusion 311 along the first direction a. Further, as... Figure 9 As shown, the slope of the last section 231 of the first thread groove is less than the slope of the remaining thread grooves of the external thread 23, which is beneficial for the last section 3131 of the first thread protrusion to be screwed in or out.

[0096] It should be understood that the above embodiments are exemplary and are not intended to encompass all possible implementations included in the claims. Various modifications and changes can be made to the above embodiments without departing from the scope of this disclosure. Similarly, the various technical features of the above embodiments can be arbitrarily combined to form other embodiments of this utility model that may not be explicitly described. Therefore, the above embodiments only illustrate several implementations of this utility model and do not limit the scope of protection of this utility model patent.

Claims

1. An impact electric drill characterized by, The impact drill includes: Output shaft, used to drive the tool head in operation; A transmission housing for accommodating a transmission mechanism, and its outer wall is provided with a first protrusion; An adjusting nut is screwed onto the outer periphery of the transmission housing, and its inner wall is provided with a second protrusion; A mode switching component, which is movably sleeved on the outer periphery of the output shaft; An adjusting sleeve, wherein the adjusting nut is non-rotatably installed in the adjusting sleeve, and the adjusting nut is axially movable relative to the adjusting sleeve; When the adjusting sleeve rotates in the first direction to drive the mode switching component to rotate from the first position to the second position, the adjusting nut can spiral forward from the drill stop position to the impact stop position. Specifically, when the adjusting nut is in the impact stop position, the first protrusion abuts against the second protrusion along the first direction to prevent the adjusting nut from spiraling backward and disengaging from the impact stop position; when the force applied to the adjusting nut along the second direction is greater than the resistance of the first protrusion, the second protrusion can pass over the first protrusion; the first direction is opposite to the second direction.

2. The impact drill according to claim 1, characterized by The adjusting nut also has a screw stop position, and the adjusting sleeve drives the adjusting nut to spiral forward from the screw stop position to the drill stop position by rotating in the first direction. The outer wall of the transmission housing is also provided with a third protrusion, and the adjusting nut is also provided with a fourth protrusion; When the adjusting nut is in the drill stop position, the third protrusion abuts against the fourth protrusion in the first direction to prevent the adjusting nut from spiraling backward and disengaging from the drill stop position; when the force applied to the adjusting nut in the second direction is greater than the resistance of the third protrusion, the fourth protrusion can pass over the third protrusion.

3. The impact drill according to claim 2, characterized in that, The first protrusion and the third protrusion are spaced apart along the axial direction of the adjusting nut.

4. The impact drill according to claim 1, characterized by The number of the first protrusions is at least two, and the second protrusions are arranged in a one-to-one correspondence with the first protrusions.

5. The impact drill according to claim 4, characterized in that, The transmission housing includes an annular column, and the first protrusion is provided on the outer wall of the annular column; All the first protrusions are arranged in an array along the circumference of the annular column.

6. The impact drill according to claim 2, characterized in that, The number of the third protrusions is at least two, and the fourth protrusions are arranged in a one-to-one correspondence with the third protrusions.

7. The impact drill according to claim 6, characterized in that, The transmission housing includes an annular column, and the third protrusion is provided on the outer wall of the annular column; All of the third protrusions are arranged in an array along the circumference of the annular column.

8. The impact drill according to claim 2, wherein The transmission housing is provided with external threads, and the adjusting nut is provided with matching internal threads; The first protrusion and the third protrusion are respectively located on the outer surface of the thread protrusion of the external thread, and the second protrusion and the fourth protrusion are respectively located on the bottom wall of the thread groove of the internal thread.

9. The impact drill according to claim 8, characterized by The number of the first protrusion is equal to the number of the third protrusion; The first protrusion and the third protrusion are spaced apart along the axial direction of the adjusting nut, and are directly opposite each other in the axial direction.

10. The impact drill according to claim 9, characterized by A first protrusion and a second protrusion are respectively configured to form a set of impact stop anti-reverse structures, and a third protrusion and a fourth protrusion are respectively configured to form a set of drill stop anti-reverse structures; a set of impact stop anti-reverse structures and a set of drill stop anti-reverse structures constitute a set of double stop anti-reverse structures. The fit between the transmission housing, the adjusting nut, and the adjusting sleeve conforms to the following formula: Wherein, the minimum axial distance between the highest point of the first protrusion and the lowest point of the second protrusion, and the minimum axial distance between the highest point of the third protrusion and the lowest point of the fourth protrusion are both H; L represents the lead of the thread between the transmission housing and the adjusting nut, α represents the interior angle between the third and fourth protrusions in the same group when the impact drill is in screw mode, β represents the angle of rotation of the adjusting sleeve when the impact drill switches from drill mode to impact mode, θ represents the maximum angle that the adjusting sleeve can rotate, and n represents the number of groups of the double-speed anti-backward structure.

Images