Adjustment mechanism and hand-held power tool
By dividing the adjustment cover into three zones and utilizing the interaction between the spring and the zones, a simplified adjustment of the impact drill's gear and torque output is achieved, solving the problem of complex structure in existing technologies and providing a simple method for gear and torque adjustment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SIJIEDA TECH (SUZHOU) CO LTD
- Filing Date
- 2023-06-29
- Publication Date
- 2026-07-24
AI Technical Summary
The existing impact drill has a complex adjustment structure and the adjustment method is not compact enough, making it difficult to achieve simple adjustment of gear and torque output at the same time.
The design adopts a three-zone layout within the adjustment cover, utilizing the interaction between the spring and the zone to adjust the gear and torque output. Gear switching and torque adjustment can be achieved by rotating the adjustment cover, simplifying the structure.
It enables easy adjustment of gear and torque output, has a simple structure, is easy to operate, reduces adjustment steps, and improves the user experience.
Smart Images
Figure CN116638127B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of power tool technology, and more specifically, to an adjustment mechanism and a handheld power tool. Background Technology
[0002] Impact drills typically have three working modes: screwdriver, electric drill, and impact drill. When using the screwdriver mode, torque output also needs to be controlled. Existing impact drills usually include a mode adjustment cover and a torque adjustment cover. The mode adjustment cover is used to adjust the impact drill's working mode, and the torque adjustment cover is used to adjust the torque output of the screwdriver mode. In use, first use the mode adjustment cover to adjust the working mode. If it is set to screwdriver mode, use the torque adjustment cover to set the torque. If the resistance encountered while tightening the screw exceeds the set torque, the transmission link will disengage, and the output shaft will stop rotating, preventing damage to the screw and motor burnout. If the mode is set to electric drill or impact drill, the torque adjustment cover will not function; even if the torque adjustment cover is rotated, the torque cannot be adjusted.
[0003] However, the aforementioned impact drills that adjust working gears and torque output have problems such as complex internal structure and adjustment methods, and insufficiently compact structural dimensions. In view of this, this application is hereby submitted. Summary of the Invention
[0004] The purpose of this application is to address the shortcomings of the prior art by providing an adjustment mechanism and a handheld power tool, which has a simple structure and is easy to adjust.
[0005] To achieve the above objectives, the technical solutions adopted in the embodiments of this application are as follows:
[0006] One aspect of this application provides an adjustment mechanism, including: a gearbox housing, an adjustment cover, a spring, an adjustment assembly, and an output shaft disposed in the gearbox housing; the adjustment cover is divided into a first region, a second region, and a third region along a first direction; the spring has a mating part; when the mating part is located in the first region, the adjustment mechanism is in the screwdriver position and adjusts the torque output according to the movement of the mating part; when the mating part is located in the second region, the adjustment mechanism is in the electric drill position; when the mating part is located in the third region, the adjustment mechanism is in the impact drill position.
[0007] Optionally, a plurality of first adjustment slots are provided at intervals along a first direction in the first region, a second adjustment slot is provided in the second region, and a third adjustment slot is provided in the third region, and the mating part can be inserted into the first adjustment slot, the second adjustment slot or the third adjustment slot to position the spring piece.
[0008] Optionally, the spring has a fixed end and a movable end, with a mating part located between the fixed end and the movable end. The fixed end is fixed to the gearbox housing. The mating part is engaged in the first adjustment groove or the second adjustment groove, and the movable end extends into the adjustment assembly to restrict the output shaft from moving along its axial direction. The mating part is engaged in the third adjustment groove, and the movable end is located outside the adjustment assembly. The output shaft can reciprocate along the axial direction of the output shaft under the drive of the adjustment assembly.
[0009] Optionally, the distance between the abutment of the third adjustment groove and the axis of the output shaft is R3, the distance between the abutment of the second adjustment groove and the axis of the output shaft is R2, the distance between the abutment of the first adjustment groove and the axis of the output shaft is R1, R3 > R2, R3 > R1, and the radial length of the movable end of the spring inserted into the adjustment assembly is H, R3-R2≥H, R3-R1≥H.
[0010] Optionally, the first adjusting groove and the second adjusting groove have the same shape and size.
[0011] Optionally, the adjustment assembly includes a drive assembly and a torque adjustment assembly. The drive assembly is used to drive the output shaft to rotate, and the torque adjustment assembly is used to adjust the torque output of the output shaft. The mating part of the spring moves in the first region, and the torque adjustment assembly adjusts the torque output of the output shaft according to the position of the mating part engaging in the first adjustment groove. When the mating part engages in the second adjustment groove, the torque adjustment assembly is in its limit state.
[0012] Optionally, the drive assembly includes a gear set, a drive shaft, and an internal gear ring. The gear set is used to drive the drive shaft or the internal gear ring to rotate, and the drive shaft is used to drive the output shaft to rotate. The torque adjustment assembly includes a first adjusting ring, a second adjusting ring, a first elastic element connected between the first adjusting ring and the second adjusting ring, and an adjusting block disposed on the side of the second adjusting ring away from the first elastic element. The first adjusting ring is threadedly connected to the adjusting cover, and the adjusting block abuts against the internal gear ring. The adjusting cover rotates in a first direction, and the first adjusting ring moves toward the second adjusting ring.
[0013] Optionally, the adjustment assembly further includes a first end tooth and a second end tooth sleeved on the output shaft and meshing with each other, and a second elastic member connected between the first end tooth and the second end tooth. The first end tooth is fixedly connected to the output shaft. The mating part is inserted into the first adjustment groove or the second adjustment groove, and the movable end extends between the first end tooth and the second end tooth to restrict the meshing of the first end tooth and the second end tooth, thereby restricting the movement of the output shaft along its axial direction.
[0014] Optionally, the second adjusting groove and the adjacent first adjusting groove are adjacent to each other, and / or, a first transition surface is provided between the second adjusting groove and the adjacent first adjusting groove; the second adjusting groove and the third adjusting groove are adjacent to each other, and / or, a second transition surface is provided between the second adjusting groove and the third adjusting groove; the third adjusting groove and the adjacent first adjusting groove are adjacent to each other, and / or, a third transition surface is provided between the third adjusting groove and the adjacent first adjusting groove.
[0015] In another aspect of the embodiments of this application, a handheld power tool is provided, including the adjustment mechanism as described in any of the above.
[0016] The beneficial effects of this application include:
[0017] This application provides an adjustment mechanism, including: a gearbox housing, an adjustment cover, a spring, an adjustment assembly, and an output shaft disposed on the gearbox housing; the adjustment cover is divided into a first region, a second region, and a third region along a first circumferential direction; the spring has a mating part; when the mating part is located in the first region, the adjustment mechanism is in the screwdriver gear position and adjusts the torque output according to the movement of the mating part; when the mating part is located in the second region, the adjustment mechanism is in the electric drill gear position; when the mating part is located in the third region, the adjustment mechanism is in the impact drill gear position. This adjustment mechanism, by dividing the adjustment cover into three circumferential regions and utilizing the mating of the spring with the three regions, achieves gear and torque adjustment. It has a simple structure and is easy to adjust. Compared to the prior art which uses two adjustment covers to adjust the working gear and torque output separately, this application only uses one adjustment cover to achieve gear switching and torque adjustment, greatly simplifying the structure of the entire adjustment mechanism and making it simpler and more convenient to use. Attached Figure Description
[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0019] Figure 1 This is a schematic diagram of the structure of the adjustment mechanism provided in the embodiments of this application;
[0020] Figure 2 A cross-sectional view of the adjustment mechanism provided in the embodiments of this application;
[0021] Figure 3 A cross-sectional view of the adjusting mechanism provided in the embodiment of this application when it is in the impact drill gear position;
[0022] Figure 4 This is a schematic diagram of the position switching of the spring piece in the adjustment mechanism provided in the embodiments of this application;
[0023] Figure 5 A cross-sectional view of the adjusting cover and output shaft in the adjusting mechanism provided in the embodiments of this application;
[0024] Figure 6 One of the partial structural schematic diagrams of the adjustment mechanism provided in the embodiments of this application;
[0025] Figure 7 This is a second partial structural schematic diagram of the adjustment mechanism provided in the embodiments of this application. Detailed Implementation
[0026] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0027] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. It should be noted that, unless otherwise specified, the various features in the embodiments of this application can be combined with each other, and the combined embodiments are still within the protection scope of this application.
[0028] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0029] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0030] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0031] One aspect of the embodiments of this application refers to... Figure 1 and Figure 2 An adjustment mechanism 100 is provided, including: a gearbox housing 110, an adjustment cover 120, a spring 130, an adjustment assembly 140, and an output shaft 150 disposed on the gearbox housing 110; please refer to the reference. Figure 3 and Figure 4 The adjusting cover 120 is divided into a first region, a second region, and a third region along a first direction of the circumference; the spring 130 has a mating part 131; when the mating part 131 is located in the first region, the adjusting mechanism 100 is in the screwdriver position and adjusts the torque output according to the movement of the mating part 131; when the mating part 131 is located in the second region, the adjusting mechanism 100 is in the electric drill position; when the mating part 131 is located in the third region, the adjusting mechanism 100 is in the impact drill position.
[0032] The adjustment mechanism 100 has three positions: screwdriver, electric drill, and impact drill. Switching between these positions is achieved by rotating the adjustment cover 120. When the adjustment mechanism 100 is in the screwdriver position, torque adjustment is also required, which is also achieved by rotating the adjustment cover 120. In other words, in this embodiment, both the position adjustment and the torque adjustment of the screwdriver position can be achieved simply by rotating the adjustment cover 120, making the structure and operation simpler.
[0033] Specifically, the output shaft 150 is mounted on the gearbox housing 110. The adjusting cover 120 is fitted over the output shaft 150 and coaxially mounted with it. The adjusting assembly 140 is located inside the adjusting cover 120 and / or the gearbox housing 110 and is driven by the output shaft 150 to drive the output shaft 150 to perform corresponding actions based on the gear position of the adjusting cover 120. The adjusting cover 120 has a cylindrical portion inside, and along the circumference of this cylindrical portion, it is sequentially divided into a first region, a second region, and a third region in a first direction (clockwise or counterclockwise). The first region corresponds to the screwdriver gear position, the second region corresponds to the electric drill gear position, and the third region corresponds to the impact drill gear position. Since the torque needs to be further adjusted by rotating the adjusting cover 120 in the screwdriver gear position, preferably, the length of the first region in the first direction is greater than the lengths of the second and third regions in the first direction. A spring plate 130 is located inside the adjusting cover 120 and is used to cooperate with the adjusting cover 120 to adjust the gear torque and position the adjusting cover 120.
[0034] When the spring 130 engages with the first area of the adjusting cover 120, the adjusting mechanism 100 is in the screwdriver position, and the output shaft 150 rotates around its axis under the drive of the adjusting component 140. By engaging the spring 130 with different positions of the first area, the torque of the output shaft 150 can be adjusted. When the spring 130 engages with the second area of the adjusting cover 120, the adjusting mechanism 100 is in the electric drill position, and the output shaft 150 rotates around its axis under the drive of the adjusting component 140. When the spring 130 engages with the third area of the adjusting cover 120, the adjusting mechanism 100 is in the impact drill position, and the output shaft 150 simultaneously rotates around its axis and reciprocates linearly along its axis under the drive of the adjusting component 140.
[0035] The aforementioned adjustment mechanism 100, by dividing three circumferential regions within the adjustment cover 120, utilizes the interaction of the spring plate 130 with these three regions to adjust the gear and torque. It has a simple structure and is easy to adjust. In use, gear switching and torque adjustment can be achieved simply by rotating the adjustment cover 120.
[0036] Please refer to Figure 4 Optionally, in one possible implementation of this application embodiment, a plurality of first adjustment grooves 121 are provided at intervals along a first direction in the first region, a second adjustment groove 122 is provided in the second region, and a third adjustment groove 123 is provided in the third region. The mating part 131 can be inserted into the first adjustment groove 121, the second adjustment groove 122 or the third adjustment groove 123 to position the spring piece 130.
[0037] During the rotation of the adjustment cover 120, the mating part 131 of the spring piece 130 switches from one adjustment slot arranged at intervals around the circumference of the adjustment cover 120 to the next adjustment slot. This provides a prompt sound for gear or torque adjustment and positions the adjustment cover 120 at the end of the adjustment. It can be understood that the adjustment slot refers to the first adjustment slot 121, the second adjustment slot 122, or the third adjustment slot 123.
[0038] For example, the first adjustment groove 121, the second adjustment groove 122 and the third adjustment groove 123 are all arc-shaped grooves, and the outer contour of the mating part 131 of the spring piece 130 is also arc-shaped. The mating between the arc-shaped mating part 131 and the arc-shaped groove can make the relative movement of the adjustment cover 120 and the spring piece 130 smoother, which can realize the prompting and positioning functions, and also avoid the situation of jamming.
[0039] Please refer to the reference. Figure 3 Optionally, in one possible embodiment of this application, the spring 130 has a fixed end 132 and a movable end 133, and the mating part 131 is located between the fixed end 132 and the movable end 133. The fixed end 132 is fixed to the gearbox housing 110. When the mating part 131 is engaged in the first adjustment groove 121 or the second adjustment groove 122, the movable end 133 extends into the adjustment assembly 140 to restrict the output shaft 150 from moving along its axial direction. When the mating part 131 is engaged in the third adjustment groove 123, the movable end 133 is located outside the adjustment assembly 140, and the output shaft 150 can reciprocate along its axial direction under the drive of the adjustment assembly 140.
[0040] One end of the spring piece 130 is a fixed end 132, which is fixed to the gearbox housing 110, and the other end of the spring piece 130 is a movable end 133, which can move freely. For example, the gearbox housing 110 has a shaped groove that matches the shape and size of the fixed end 132 of the spring piece 130. The fixed end 132 is inserted into the shaped groove to fix the spring piece 130. The spring piece 130 forms a mating part 131 by bending itself. The mating part 131 protrudes from the line connecting the fixed end 132 and the movable end 133, so as to extend into the adjustment groove of the adjustment cover 120.
[0041] The adjusting component 140 can drive the output shaft 150 to rotate or reciprocate linearly. However, the function of the adjusting component 140 in driving the output shaft 150 to reciprocate linearly can be limited by the spring 130. When the mating part 131 is engaged in the first adjusting groove 121 or the second adjusting groove 122, the movable end 133 of the spring 130 extends into the impact component included in the adjusting component 140 under the restriction of the adjusting cover 120. By limiting the movement of the impact component, the movement of the output shaft 150 is limited along its axial direction, so as to ensure that when the adjusting mechanism 100 is in the screwdriver and drill positions, the output shaft 150 can only rotate. When the mating part 131 is engaged in the third adjusting groove 123, the spring 130 is reset, and the movable end 133 is disengaged from the impact component of the adjusting component 140, no longer limiting the movement of the impact component. Thus, when the adjusting mechanism 100 is in the impact drill position, the output shaft 150 can simultaneously rotate and reciprocate linearly.
[0042] Please refer to Figure 4 and Figure 5 Optionally, in one possible implementation of this application embodiment, the distance between the abutment of the third adjusting groove 123 and the axis of the output shaft 150 is R3, the distance between the abutment of the second adjusting groove 122 and the axis of the output shaft 150 is R2, and the distance between the abutment of the first adjusting groove 121 and the axis of the output shaft 150 is R1, where R3 > R2 and R3 > R1. The radial length of the movable end 133 of the spring piece 130 inserted into the adjusting assembly 140 is H, where R3 - R2 ≥ H and R3 - R1 ≥ H. Therefore, it can be ensured that when the mating part 131 is engaged in the third adjusting groove 123, the movable end 133 of the spring piece 130 is completely removed from the impact component of the adjusting assembly 140, without affecting the realization of the impact function.
[0043] It should be noted that the abutting point of the adjustment groove refers to the position where the adjustment groove abuts against the mating part 131 of the spring piece 130 when it mates with the mating part 131. By limiting the size and position of the first adjustment groove 121, the second adjustment groove 122, and the third adjustment groove 123, it is ensured that when the mating part 131 is engaged in the first adjustment groove 121 or the second adjustment groove 122, the movable end 133 of the spring piece 130 extends into the adjustment assembly 140; when the mating part 131 is engaged in the third adjustment groove 123, the movable end 133 of the spring piece 130 moves outward and exits the adjustment assembly 140.
[0044] Preferably, R1 = R2, to facilitate the processing of the adjustment cover 120.
[0045] Optionally, in one possible implementation of this application embodiment, the first adjustment groove 121 and the second adjustment groove 122 have the same shape and size.
[0046] That is, the first adjustment groove 121 and the second adjustment groove 122 have the same shape and the same size. Since the first adjustment groove 121 and the second adjustment groove 122 drive the output shaft 150 to rotate after cooperating with the spring piece 130, from this point of view, the first adjustment groove 121 and the second adjustment groove 122 have the same function. This arrangement can facilitate the processing of the adjustment cover 120.
[0047] Optionally, in one possible implementation of this application embodiment, the second adjusting groove 122 and the adjacent first adjusting groove 121 are adjacently connected, and / or, a first transition surface is provided between the second adjusting groove 122 and the adjacent first adjusting groove 121; the second adjusting groove 122 and the third adjusting groove 123 are adjacently connected, and / or, a second transition surface 124 is provided between the second adjusting groove 122 and the third adjusting groove 123; the third adjusting groove 123 and the adjacent first adjusting groove 121 are adjacently connected, and / or, a third transition surface 125 is provided between the third adjusting groove 123 and the adjacent first adjusting groove 121.
[0048] It should be noted that the adjacency setting of the two adjustment slots means that the two adjustment slots are adjacent and connected to each other. The adjacency setting of the two adjacent connecting slots or the provision of a transition surface between them can make the relative movement between the adjustment cover 120 and the spring piece 130 smoother, avoid jamming, and at the same time, reduce the driving force required to drive the adjustment cover 120 to rotate.
[0049] Please refer to Figure 2 and Figure 6 Optionally, in one possible implementation of this application embodiment, the adjustment component 140 includes a drive component and a torque adjustment component. The drive component is used to drive the output shaft 150 to rotate, and the torque adjustment component is used to adjust the torque output of the output shaft 150. When the mating part 131 of the spring piece 130 moves in the first region, the adjustment mechanism 100 is in the screwdriver position, and the torque adjustment component adjusts the torque output of the output shaft 150 according to the position of the mating part 131 engaging in the first adjustment groove 121. When the mating part 131 engages in the second adjustment groove 122, the adjustment mechanism 100 is in the electric drill position. At this time, the torque adjustment component is in the limit state (maximum position), so that the torque adjustment does not work. Similarly, when the mating part 131 engages in the third adjustment groove 123, the adjustment mechanism 100 is in the impact drill position, and the torque adjustment still does not work.
[0050] Optionally, in one possible implementation of this application embodiment, the drive assembly includes a gear set 1411, a drive shaft 1412, and an internal gear ring 1413. The gear set 1411 is used to drive the drive shaft 1412 or the internal gear ring 1413 to rotate, and the drive shaft 1412 is used to drive the output shaft 150 to rotate. The torque adjustment assembly includes a first adjustment ring 1421, a second adjustment ring 1422, a first elastic member 1423 disposed between the first adjustment ring 1421 and the second adjustment ring 1422, and an adjustment block 1424 disposed on the side of the second adjustment ring 1422 away from the first elastic member 1423. The first adjustment ring 1421 is threadedly connected to the adjustment cover 120, and the adjustment block 1424 abuts against the internal gear ring 1413. The adjustment cover 120 rotates in a first direction, and the first adjustment ring 1421 moves toward the second adjustment ring 1422.
[0051] The adjusting cover 120 is threadedly engaged with the first adjusting ring 1421. Rotation of the adjusting cover 120 causes the first adjusting ring 1421 to move axially. This axial movement compresses the first elastic element 1423 (such as a spring), which in turn forces the second adjusting ring 1422 to push the adjusting block 1424 (e.g., in the form of a pin or ball) against the internal gear ring 1413 of the drive assembly. By changing the pressure of the adjusting block 1424 on the internal gear ring 1413, the relative movement between the two is altered. Thus, the adjusting cover 120 rotates, and the torque can be set.
[0052] After the torque is set on the rotating adjustment cover 120, during normal operation, the adjustment block 1424 abuts against the internal gear ring 1413 under the action of the first elastic element 1423, and the internal gear ring 1413 does not rotate. The gear set 1411 drives the output shaft 150 to rotate. When the resistance on the output shaft 150 is greater than the set torque (for example, when the screwdriver bit installed on the output shaft 150 cannot turn the screw), the output shaft 150 cannot rotate. The gear set 1411 drives the internal gear ring 1413 to rotate against the force of the adjustment block 1424. In this process, since the rotation of the drive shaft 1412 is converted into the rotation of the internal gear ring 1413, it will not be converted into the rotation of the output shaft 150. Therefore, the motor will not burn out due to the output shaft 150 being blocked from rotating.
[0053] It should be noted that the technical solution of converting the rotation of the drive shaft 1412 into the rotation of the internal gear ring 1413 is existing technology, and will not be described in detail here. In the circumferential direction where torque increases, when the adjusting cover 120 rotates to the maximum position, and the engaging part 131 of the spring plate 130 engages with the second adjusting groove 122, the second adjusting ring 1422 presses the adjusting block 1424 firmly onto the internal gear ring 1413. At this time, torque adjustment is ineffective, and the adjusting mechanism 100 is adjusted to the electric drill position.
[0054] For example, the internal gear ring 1413 has multiple end teeth 1413a along the circumferential direction on the end face facing the adjusting block 1424. Rotation of the adjusting cover 120 changes the pressure of the adjusting block 1424 on the internal gear ring 1413, thereby changing the difficulty for the adjusting block 1424 to overcome the end teeth 1413a, and thus setting the torque. When the rotation of the drive shaft 1412 is converted into the rotation of the internal gear ring 1413, the adjusting block 1424 is pushed against the first elastic member 1423. Therefore, during the continuous rotation of the internal gear ring 1413, the adjusting block 1424 continuously overcomes the action of the first elastic member 1423 to overcome one end tooth 1413a after another on the internal gear ring 1413.
[0055] For example, the first elastic element 1423 and the adjusting block 1424 each include multiple ones, and are evenly distributed along the circumferential direction of the second adjusting ring 1422; the inner gear ring 1413 has multiple end teeth 1413a evenly arranged along the circumferential direction on the end face of the adjusting block 1424 facing the adjusting block 1424, and the number of end teeth 1413a is the same as the number of adjusting blocks 1424. During the continuous rotation of the inner gear ring 1413, multiple adjusting blocks 1424 simultaneously pass over multiple end teeth 1413a.
[0056] Please refer to Figure 2 and Figure 7 Optionally, in one possible implementation of this application embodiment, the adjustment component 140 further includes an impact component, which is drivenly connected to the output shaft 150. The impact component is used to drive the output shaft 150 to move axially. When the mating part 131 is engaged in the first adjustment groove 121 or the second adjustment groove 122, the movable end 133 extends into the impact component to restrict the output shaft 150 from moving along its axial direction. Specifically, the impact assembly includes a first end tooth 1431 and a second end tooth 1432 sleeved on the output shaft 150 and capable of meshing with each other, and a second elastic member 1433 disposed between the first end tooth 1431 and the second end tooth 1432. The first end tooth 1431 is fixedly connected to the output shaft 150. When the mating part 131 is engaged in the first adjustment groove 121 or the second adjustment groove 122, the movable end 133 extends between the first end tooth 1431 and the second end tooth 1432 to restrict the meshing of the first end tooth 1431 and the second end tooth 1432, thereby restricting the movement of the output shaft 150 along its axial direction.
[0057] A second elastic element 1433 (such as a spring) is provided between the first end tooth 1431 and the second end tooth 1432, and the second elastic element 1433 separates the first end tooth 1431 and the second end tooth 1432. The first end tooth 1431 is tightly fitted with the output shaft 150 and is relatively fixed, while the second end tooth 1432 is loosely fitted with the output shaft 150 and has no linkage with the output shaft 150.
[0058] When adjusted to the impact drill gear, when the far end of the output shaft 150 presses against the workpiece, the workpiece pushes the output shaft 150 toward the adjustment assembly 140. The output shaft 150 drives the first end tooth 1431 to overcome the force of the second elastic element 1433 and move toward the second end tooth 1432 and mesh with the second end tooth 1432. At the same time, the output shaft 150 rotates under the drive of the drive assembly. The output shaft 150 can overcome the force of the second elastic element 1433 and drive the first end tooth 1431 to pass over the tooth surface of the second end tooth 1432. As a result, the first end tooth 1431 and the output shaft 150 move away from the second end tooth 1432... This process is repeated, and the output shaft 150 generates axial reciprocating motion, that is, axial impact. When in screwdriver or drill mode, the mating part 131 of the spring 130 engages with the first adjustment groove 121 or the second adjustment groove 122, and the movable end 133 engages radially between the first end tooth 1431 and the second end tooth 1432. The first end tooth 1431 cannot move axially, thus preventing impact.
[0059] For example, the radial width of the second end tooth 1432 is greater than the radial width of the first end tooth 1431. The second elastic element 1433 abuts against the radial outer end of the second end tooth 1432. To allow the first end tooth 1431 to better abut against the second elastic element 1433, a baffle 1434 is engaged on the first end tooth 1431. The radial width of the baffle 1434 is approximately equal to that of the second end tooth 1432. The second elastic element 1433 abuts between the second end tooth 1432 and the baffle 1434. The baffle 1434 is fixed circumferentially relative to the bearing locating ring 160 (the gap is the installation clearance, and the circumferential rotation caused by the installation clearance is negligible). The bearing locating ring 160 is used to locate the output shaft 150. The baffle 1434 has a certain distance in the axial direction from the end face of the first end tooth 1431 that is away from the second end tooth 1432, which also prevents the baffle 1434 from being worn during the rotation of the first end tooth 1431. At this time, when in screwdriver or drill mode, the mating part 131 of the spring 130 engages with the first adjustment groove 121 or the second adjustment groove 122, and the movable end 133 engages radially between the baffle 1434 and the second end tooth 1432. Since the axial distance between the first end tooth 1431 and the baffle 1434 is not large except for the aforementioned anti-wear fitting allowance, it is equivalent to the spring 130 engaging radially between the first end tooth 1431 and the second end tooth 1432. The first end tooth 1431 cannot move axially, thus preventing impact.
[0060] Please refer to Figure 1 and Figure 2 This embodiment also provides a handheld power tool, including the adjustment mechanism 100 as described above.
[0061] This handheld power tool has the same structure and beneficial effects as the adjustment mechanism 100 in the foregoing embodiments. The structure and beneficial effects of the adjustment mechanism 100 have been described in detail in the foregoing embodiments and will not be repeated here.
[0062] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. An adjustment mechanism, characterized in that, include: Gearbox housing, adjusting cover, spring, adjusting assembly, and output shaft disposed on the gearbox housing; The adjustment cover is divided into a first region, a second region, and a third region along a first direction of the circumference; the spring has a mating part. The mating part is located in the first area, and the adjusting mechanism is in the screwdriver setting and adjusts the torque output according to the movement of the mating part; the mating part is located in the second area, and the adjusting mechanism is in the electric drill setting; the mating part is located in the third area, and the adjusting mechanism is in the impact drill setting. Multiple first adjustment slots are provided at intervals along the first direction in the first region, a second adjustment slot is provided in the second region, and a third adjustment slot is provided in the third region. The mating part can be inserted into the first adjustment slot, the second adjustment slot, or the third adjustment slot to position the spring piece. The spring has a fixed end and a movable end, the mating part is located between the fixed end and the movable end, and the fixed end is fixed to the gearbox housing; The mating part is engaged in the first adjustment groove or the second adjustment groove, and the movable end extends into the adjustment assembly to restrict the output shaft from moving along its axial direction; the mating part is engaged in the third adjustment groove, and the movable end is located outside the adjustment assembly, so that the output shaft can reciprocate along the axial direction of the output shaft under the drive of the adjustment assembly.
2. The adjusting mechanism as described in claim 1, characterized in that, The distance between the abutment of the third adjustment groove and the axis of the output shaft is R3, the distance between the abutment of the second adjustment groove and the axis of the output shaft is R2, and the distance between the abutment of the first adjustment groove and the axis of the output shaft is R1, where R3 > R2 and R3 > R1. The radial length of the movable end of the spring piece inserted into the adjustment assembly is H, where R3 - R2 ≥ H and R3 - R1 ≥ H.
3. The adjusting mechanism as described in claim 1, characterized in that, The adjustment component includes a drive component and a torque adjustment component. The drive component is used to drive the output shaft to rotate, and the torque adjustment component is used to adjust the torque output of the output shaft. The mating part of the spring plate moves within the first region, and the torque adjustment component adjusts the torque output of the output shaft according to the position of the mating part engaging in the first adjustment groove; when the mating part engages in the second adjustment groove, the torque adjustment component is in its limit state.
4. The adjusting mechanism as described in claim 3, characterized in that, The drive assembly includes a gear set, a drive shaft, and an internal gear ring. The gear set drives the drive shaft or the internal gear ring to rotate, and the drive shaft drives the output shaft to rotate. The torque adjustment assembly includes a first adjustment ring, a second adjustment ring, a first elastic element disposed between the first and second adjustment rings, and an adjustment block disposed on the side of the second adjustment ring away from the first elastic element. The first adjustment ring is threadedly connected to the adjustment cover, and the adjustment block abuts against the internal gear ring. The adjustment cover rotates along the first direction, and the first adjustment ring moves toward the second adjustment ring.
5. The adjusting mechanism as described in claim 1, characterized in that, The adjustment assembly further includes a first end tooth and a second end tooth sleeved on the output shaft and capable of meshing with each other, and a second elastic element disposed between the first end tooth and the second end tooth. The first end tooth is fixedly connected to the output shaft. The mating part is engaged in the first adjustment groove or the second adjustment groove, and the movable end extends between the first end tooth and the second end tooth to restrict the meshing of the first end tooth and the second end tooth, thereby restricting the movement of the output shaft along its axial direction.
6. The adjusting mechanism as described in claim 1, characterized in that, The first adjustment groove and the second adjustment groove have the same shape and size.
7. The adjusting mechanism as described in claim 1, characterized in that, The second adjusting groove and the adjacent first adjusting groove are adjacent to each other, and / or, a first transition surface is provided between the second adjusting groove and the adjacent first adjusting groove; the second adjusting groove and the third adjusting groove are adjacent to each other, and / or, a second transition surface is provided between the second adjusting groove and the third adjusting groove; the third adjusting groove and the adjacent first adjusting groove are adjacent to each other, and / or, a third transition surface is provided between the third adjusting groove and the adjacent first adjusting groove.
8. A handheld power tool, characterized in that, Includes the adjustment mechanism as described in any one of claims 1 to 7.