Impact drill

Abstract

This utility model relates to an impact drill, comprising: a gearbox with a clearance groove on its inner wall; an output shaft; a moving ratchet; a stationary ratchet; a mode switcher including a connected annular portion and an extension arm; the mode switcher can switch between a first position and a second position by rotation; and a reset elastic member including a first end and a second end; when the mode switcher is in the first position, the extension arm is restricted and cannot move along the axial direction of the output shaft, and the impact drill is in drilling mode; during the rotation of the mode switcher from the first position to the second position, the clearance groove is used to avoid displacement of the first end in the radial direction of the output shaft; when the mode switcher is in the second position, the extension arm can move axially, and the impact drill is in impact mode. The impact drill of this utility model has a clearance groove on the inner wall of the gearbox to ensure that the reset elastic member can smoothly reset the mode switcher from the second position to the first position.

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 are a common type of power tool. They have two working modes: drilling mode and impact mode. In impact mode, the stationary ratchet and the moving ratchet of the impact drill can contact each other. As the moving ratchet rotates relative to the stationary ratchet, it causes the output shaft to move axially, thereby generating an impact force.

[0003] The impact drill is equipped with a mode switching mechanism for switching modes. This mechanism mainly includes a mode switching element and a return spring. The mode switching element abuts against the support bearing of the output shaft in a rear-to-forward direction. When the mode switching element is in the first position, it is axially limited and cannot move axially along the output shaft, thus restricting the rearward movement of the support bearing. Simultaneously, because the drill bit mounted on the output shaft is blocked by the workpiece (such as a wall), the output shaft cannot move forward, and therefore the output shaft cannot move axially. At this time, the impact drill is in drilling mode. When the mode switching element rotates to the second position, the axial limitation is released, allowing the mode switching element to move axially, and consequently, the output shaft can move axially. At this time, the impact drill is in impact mode. During the rearward movement of the mode switching element, the return spring is compressed. When the rearward pressure applied by the output shaft to the mode switching element is removed, the return spring resets and pushes the mode switching element forward, thus achieving a reset function.

[0004] In some impact drills, the mode switch is located in the gearbox, and the return spring is located between the inner wall of the gearbox and the outer wall of the mode switch. During the process of the mode switch rotating from the first position to the second position, the return spring will expand to a certain extent. This can easily cause the return spring to get stuck between the inner wall of the gearbox and the outer wall of the mode switch, resulting in the mode switch not being able to return to the first position in impact mode. Utility Model Content

[0005] Based on the aforementioned deficiencies in the prior art, the purpose of this utility model is to provide an impact drill. By providing a clearance groove on the inner wall of the gearbox, during the process of the mode switching component rotating from the first position to the second position, the clearance groove can be used to allow the expansion of the first end of the reset elastic component, so as to ensure that the reset elastic component can smoothly play the role of resetting the mode switching component from the second position to the first position.

[0006] Therefore, the present invention provides the following technical solution.

[0007] This utility model provides an impact drill, the impact drill comprising:

[0008] A gearbox, which houses the transmission mechanism, has clearance grooves on its inner wall;

[0009] Output shaft, which is used to mount the drill bit and output working power;

[0010] A movable ratchet, which is fixedly sleeved on the output shaft;

[0011] A stationary ratchet is mounted on the inner wall of the gearbox, and the output shaft moves axially through the stationary ratchet.

[0012] A mode switcher includes a connected annular portion and an extension arm, the annular portion being located within the gearbox and movably fitted onto the output shaft; the mode switcher can switch between a first position and a second position by rotation.

[0013] A reset elastic element, comprising a first end limited to the mode switching element and a second end limited to the stationary ratchet;

[0014] When the mode switching component is in the first position, the extension arm is restricted from moving along the axial direction of the output shaft, the mode switching component restricts the axial movement of the output shaft, the moving ratchet and the stationary ratchet do not contact each other, and the impact drill is in drilling mode.

[0015] During the process of the mode switching component rotating from the first position to the second position, the clearance groove is used to avoid the displacement of the first end in the radial direction of the output shaft;

[0016] When the mode switching component is in the second position, the extension arm can move along the axial direction, so that the output shaft can move axially, thereby enabling the moving ratchet and the stationary ratchet to engage, and the impact drill is in impact mode.

[0017] Optionally, the impact drill further includes a front bearing, which is sleeved on the output shaft;

[0018] When the mode switching component is in the first position, the moving ratchet and the front bearing together clamp the mode switching component.

[0019] Optionally, the annular portion is provided with a first limiting groove, and the first end is inserted into the first limiting groove. The first limiting groove is used to restrict the first end from rotating relative to the annular portion.

[0020] Optionally, the reset elastic element further includes a spiral portion, with the first end and the second end respectively connected to the two ends of the spiral portion; the spiral portion abuts against the annular portion forward.

[0021] Optionally, the front end of the gearbox is provided with a notch, the notch including a first abutting part and a second abutting part that are offset from each other along the rotation direction of the mode switching member, the first abutting part and the second abutting part being offset from front to back;

[0022] When the mode switching component is in the first position, the first abutting part abuts against the extension arm to prevent the mode switching component from moving axially backward;

[0023] When the mode switching member is in the second position, the extension arm and the second abutment are opposite each other in the axial direction and there is a gap L1 between them, which allows the extension arm to move along the axial direction.

[0024] Optionally, the annular portion is provided with a first limiting groove for inserting the first end, the first limiting groove being located on the side of the extension arm facing the clearance groove, and the first limiting groove being disposed close to the extension arm;

[0025] The clearance groove is located on the side of the second abutment portion away from the first abutment portion, and the clearance groove is connected to the notch.

[0026] Optionally, one sidewall of the extension arm forms the groove wall of the first limiting groove.

[0027] Optionally, the impact drill further includes an adjusting sleeve, which is rotatably mounted on the gearbox and at least partially fitted onto the outside of the gearbox, and the inner wall of the adjusting sleeve is provided with a toggle part;

[0028] When the mode switching component is in the first position, the toggle part abuts against the extension arm in the first direction;

[0029] When the adjusting sleeve rotates in the first direction, the actuating part actuates the extending arm to drive the mode switching member to rotate from the first position to the second position, and the reset elastic member is twisted due to compression.

[0030] When the adjusting sleeve rotates in the second direction, the reset elastic element rebounds, thereby driving the mode switching element to rotate from the second position to the first position;

[0031] The first direction is opposite to the second direction.

[0032] Optionally, the extension arm includes a first extension, a connecting portion, and a second extension connected in sequence, wherein the length of the connecting portion extends along the axial direction;

[0033] When the mode switch is in the first position, the axial movement of the first extension is restricted so that the mode switch cannot move along the axial direction, and the toggle part abuts against the second extension in the first direction.

[0034] Optionally, the inner wall of the gearbox is provided with a boss, and the boss is provided with a second limiting groove;

[0035] The stationary ratchet has a snap-fit ​​protrusion on its circumferential surface wall. The snap-fit ​​protrusion engages with the second limiting groove to restrict the rotation of the stationary ratchet.

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

[0037] This utility model provides an impact drill. By providing a clearance groove on the inner wall of the gearbox, during the process of the mode switching component rotating from the first position to the second position, the clearance groove can accommodate the expansion of the first end of the reset elastic component. This prevents the reset elastic component from getting stuck in the gap between the inner wall of the gearbox and the outer wall of the mode switching component, thus preventing the reset elastic component from failing to drive the mode switching component in the second position back to the first position. In other words, the clearance groove ensures that the mode switching component resets from the second position to the first position. 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 three-dimensional sectional view of the impact drill of this utility model in the first screw setting;

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

[0041] Figure 4 This is an exploded view of a partial structure of the impact drill when the mode switching component of this utility model is in the first position. Figure 1 ;

[0042] Figure 5 This is an exploded view of a partial structure of the impact drill when the mode switching component of this utility model is in the first position. Figure 2 ;

[0043] Figure 6 for Figure 5 Enlarged view at point B in the middle;

[0044] Figure 7 This is an enlarged view of a portion of the impact drill structure when the mode switching component of this utility model is in the first position;

[0045] Figure 8This is a partial three-dimensional structure of the impact drill when the mode switching component of this utility model is in the first position;

[0046] Figure 9 for Figure 8 Enlarged view at point C;

[0047] Figure 10 This is an enlarged view of a portion of the impact drill structure when the mode switching component of this utility model is in the second position;

[0048] Figure 11 This is a magnified view of a portion of the impact drill of this utility model when it is in the first screw setting;

[0049] Figure 12 This is a magnified view of a portion of the impact drill of this utility model in impact mode.

[0050] Explanation of reference numerals in the attached figures

[0051] 100. Impact drill;

[0052] 1. Gearbox; 11. Clearance groove; 12. Notch; 121. First abutment part; 122. Second abutment part; 123. First side wall; 124. Second side wall; 13. Boss; 131. Second limiting groove;

[0053] 2. Output shaft;

[0054] 3. Moving ratchet;

[0055] 4. Static ratchet; 41. Snap-fit ​​protrusion;

[0056] 51. Mode switching component; 511. Annular portion; 5111. First limiting groove; 512. Extension arm; 5121. First extension portion; 5122. Connecting portion; 5123. Second extension portion;

[0057] 52. Reset elastic element; 521. First end; 522. Second end; 523. Spiral part;

[0058] 53. Adjusting sleeve; 531. Actuating part;

[0059] 6. Front bearing;

[0060] 7. Transmission mechanism;

[0061] 8. Motor. Detailed Implementation

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] In this utility model, "front," "rear," "left," "right," "up," and "down" all refer to... Figure 1 The markings in the text shall prevail.

[0068] The following is based on Figures 1 to 12 This invention relates to an impact drill.

[0069] In this embodiment, such as Figures 1 to 4 As shown, the impact drill 100 includes a gearbox 1, an output shaft 2, a moving ratchet 3, a stationary ratchet 4, a mode switch 51, a reset elastic element 52, a transmission mechanism 7, and a motor 8. The gearbox 1 houses the transmission mechanism 7, and the output shaft 2 mounts the drill bit and outputs working power. The transmission mechanism 7 is typically a planetary gear system, used to transmit the power output from the motor 8 to the output shaft 2, enabling the output shaft 2 to drive the drill bit. The moving ratchet 3 is fixedly sleeved on the output shaft 2, and the stationary ratchet 4 is mounted on the inner wall of the gearbox 1. The output shaft 2 can move axially through the stationary ratchet 4. Figures 3 to 6 As shown, the mode switching member 51 includes a connected annular portion 511 and an extension arm 512. The annular portion 511 is located inside the gearbox 1 and is movably sleeved on the output shaft 2. The mode switching member 51 can switch between a first position and a second position by rotation. The reset elastic member 52 includes a first end 521 and a second end 522. The first end 521 is limited to the mode switching member 51, and the second end 522 is limited to the stationary ratchet 4.

[0070] Among them, such as Figure 3 , Figure 6 and Figure 9 As shown, when the mode switching component 51 is in the first position, the extension arm 512 is restricted and cannot move along the axial direction of the output shaft 2. The mode switching component 51 restricts the output shaft 2 from moving axially. Since the mode switching component 51 cannot move axially, the output shaft 2 also cannot move axially. Thus, the moving ratchet 3, which is fixedly sleeved on the output shaft 2, also cannot move axially. The moving ratchet 3 and the stationary ratchet 4 maintain a certain distance so that the moving ratchet 3 and the stationary ratchet 4 do not contact each other. This allows the impact drill 100 to be in the drilling mode. The impact drill 100 does not generate impact force, and the output shaft 2 only drives the drill bit to rotate.

[0071] When it is necessary to switch to impact mode, such as Figure 3 , Figure 4 , Figure 9 and Figure 10 As shown, when the mode switch 51 is rotated from the first position to the second position, during the rotation of the mode switch 51, since the first end 521 of the reset elastic member 52 is confined within the mode switch 51, the rotating mode switch 51 will twist the first end 521. The mode switch 51 stores energy due to the twist, and the first end 521 of the reset elastic member 52 will expand to a certain extent, that is, the first end 521 will be displaced radially in the output shaft 2. Figure 7As shown, the inner wall of the gearbox 1 is provided with a relief groove 11, which can extend into the relief groove 11 when the first end 521 expands. That is, the relief groove 11 can be used to avoid the displacement of the first end 521 in the radial direction of the output shaft 2.

[0072] like Figure 10 As shown, when the mode switching component 51 is in the second position, the restriction on the axial movement of the extension arm 512 is lifted, and the extension arm 512 can move axially. Therefore, the output shaft 2 can drive the moving ratchet 3 to move axially. When the output shaft 2 is subjected to a large reaction force from the workpiece, the output shaft 2 will drive the moving ratchet 3 to move axially backward. The moving ratchet 3 will rotate along the tooth surface of the stationary ratchet 4, so that the output shaft 2 can drive the drill bit to rotate while also performing axial reciprocating motion. The impact drill 100 is in impact mode. It should be understood that the mode switching component 51 will not rotate with the output shaft 2.

[0073] When it is necessary to switch to drilling mode, the reset elastic element 52 rebounds, which provides power for the mode switching element 51 to rotate from the second position to the first position. That is, the reset elastic element 52 rebounds, which drives the mode switching element 51 to reset to the first position.

[0074] The above technical solution, by providing a clearance groove 11 on the inner wall of the gearbox 1, allows the clearance groove 11 to accommodate the expansion of the first end 521 of the reset elastic member 52 during the rotation of the mode switching member 51 from the first position to the second position. This prevents the reset elastic member 52 from getting stuck in the gap between the inner wall of the gearbox 1 and the outer wall of the mode switching member 51 due to expansion, thus preventing the reset elastic member 52 from failing to drive the mode switching member 51 in the second position to reset to the first position. In other words, the clearance groove 11 ensures that the mode switching member 51 resets from the second position to the first position.

[0075] In one implementation, such as Figure 4 As shown, the reset elastic element 52 is a spring, which has a simple structure.

[0076] In one implementation, such as Figure 3 , Figure 4 and Figure 9As shown, the impact drill 100 also includes a front bearing 6. The inner peripheral wall of the front bearing 6 is sleeved on the output shaft 2, and the outer peripheral wall of the front bearing 6 abuts against the gearbox 1 to support the output shaft 2. When the mode switching member 51 is in the first position, the front bearing 6 is located in front of the annular portion 511, and the moving ratchet 3 is located behind the annular portion 511. The moving ratchet 3 and the front bearing 6 together clamp the mode switching member 51. Thus, since the mode switching member 51 is restricted from axial movement, the moving ratchet 3 is restricted from axial forward movement by the mode switching member 51, and the front bearing 6 is restricted from axial backward movement by the mode switching member 51. That is, by restricting the axial movement of the moving ratchet 3 and the front bearing 6, the mode switching member 51 prevents the output shaft 2 from moving axially forward or backward, thereby preventing the moving ratchet 3 from contacting the stationary ratchet 4.

[0077] In one implementation, such as Figure 6 and Figure 7 As shown, the annular portion 511 is provided with a first limiting groove 5111, and the first end 521 is inserted into the first limiting groove 5111. The first limiting groove 5111 is used to restrict the first end 521 from rotating relative to the annular portion 511, so that the first end 521 can be stably limited in the mode switching member 51.

[0078] Furthermore, such as Figure 6 and Figure 7 As shown, the length of the first limiting groove 5111 extends along the axial direction of the annular portion 511, and the first limiting groove 5111 penetrates the outer peripheral sidewall of the annular portion 511. The first end 521 extends along the axial direction of the annular portion 511 and is inserted into the first limiting groove 5111. In this solution, by optimizing the shape of the first limiting groove 5111 and the extension direction of the first end 521, the contact area between the first end 521 and the first limiting groove 5111 in the circumferential direction of the annular portion 511 is maximized, which helps to improve the stability of resetting the mode switching member 51 from the second position to the first position by the reset elastic member 52.

[0079] In one implementation, such as Figure 3 and Figure 4 As shown, the reset elastic member 52 also includes a helical portion 523, with the first end 521 and the second end 522 respectively connected to the two ends of the helical portion 523; the helical portion 523 abuts against the annular portion 511. Thus, when the impact drill 100 is in impact mode, the reset elastic member 52 also provides power for the axial reset of the mode switching member 51. Specifically, when the mode switching member 51 moves axially backward along with the output shaft 2, it will axially compress the reset elastic member 52. Then, the reset elastic member 52 will apply a reverse axial force to the mode switching member 51, providing power for the axial forward movement of the mode switching member 51, the output shaft 2, and the moving ratchet 3, thereby generating an impact force.

[0080] In one implementation, such as Figures 4 to 10 As shown, the front end of the gearbox 1 is provided with a notch 12. The notch 12 includes a first abutment portion 121 and a second abutment portion 122 that are offset from each other along the rotation direction of the mode switching member 51. The first abutment portion 121 and the second abutment portion 122 are offset from front to back, that is, the first abutment portion 121 is located in front of the second abutment portion 122. Figure 4 and Figure 9 As shown, when the mode switching member 51 is in the first position, the first abutting part 121 abuts forward against the extension arm 512 to prevent the mode switching member 51 from moving axially backward, thereby preventing the moving ratchet 3 from contacting the stationary ratchet 4. Figure 10 As shown, when the mode switching member 51 is in the second position, the extension arm 512 and the second abutment part 122 are axially opposite each other, and there is a gap L1 between the extension arm 512 and the second abutment part 122. The gap L1 allows the extension arm 512 to move axially. That is, when the output shaft 2 is subjected to a large reaction force from the workpiece, the mode switching member 51 can move axially backward with the output shaft 2 until the extension arm 512 abuts against the second abutment part 122, and the mode switching member 51 can no longer move axially backward. The maximum axial movement length of the mode switching member 51 is L1.

[0081] Furthermore, such as Figure 4 , Figure 6 and Figure 7 As shown, the first limiting groove 5111 is located on the side of the extension arm 512 facing the clearance groove 11, and the first limiting groove 5111 and the extension arm 512 are disposed close together. The clearance groove 11 is located on the side of the second abutment portion 122 away from the first abutment portion 121, and the clearance groove 11 communicates with the notch 12. Specifically, the notch 12 includes a first sidewall 123, a first abutment portion 121, a second abutment portion 122, and a second sidewall 124 connected in sequence, as shown. Figure 6 As shown, when the mode switching component 51 is in the first position, the extension arm 512, under the elastic force of the reset elastic component 52, laterally abuts against the first sidewall 123, as... Figure 10 As shown, when the mode switching member 51 rotates from the first position to the second position, the extension arm 512 abuts against the second side wall 124 in the opposite direction. Since the clearance groove 11 is connected to the second side wall 124 and the first limiting groove 5111 is close to the extension arm 512, the first end 521 of the reset elastic member 52, which expands due to torsion, can quickly and smoothly extend into the clearance groove 11 to achieve clearance. Of course, the position of the clearance groove 11 is not limited to this. The position of the clearance groove 11 is related to the first limiting groove 5111 and can be adjusted according to the change in the position of the first limiting groove 5111.

[0082] Furthermore, such as Figure 6As shown, one side wall of the extension arm 512 forms the groove wall of the first limiting groove 5111. Specifically, the opening of the first limiting groove 5111 will reduce the structural strength of the annular part 511 at this location. In this solution, by lowering one side wall of the extension arm 512 to form the groove wall of the first limiting groove 5111, it is beneficial to improve the structural stability of the first limiting groove 5111.

[0083] In one implementation, such as Figure 3 and Figure 11 As shown, the impact drill 100 also includes an adjusting sleeve 53, which is rotatably mounted on the gearbox 1 and at least partially fitted onto the outside of the gearbox 1. The inner wall of the adjusting sleeve 53 is provided with a toggle part 531. When the mode switch 51 is in the first position, the toggle part 531 abuts against the extension arm 512 (not shown) along the first direction a. When the adjusting sleeve 53 rotates along the first direction a, the toggle part 531 actuates the extension arm 512 to drive the mode switch 51 from the first position to the second position, and the reset elastic member 52 twists due to the compression of the mode switch 51. Figure 12 As shown, when the adjusting sleeve 53 rotates along the second direction b, the reset elastic element 52 rebounds, thereby driving the mode switching element 51 to rotate from the second position to the first position. The first direction a is opposite to the second direction b.

[0084] In one specific embodiment, the impact drill 100 also includes a screw stop mode, such as... Figure 11 As shown, when the impact drill 100 is in the first gear of the screw mode, the adjusting sleeve 53 abuts against the extension arm 512 of the mode switching member 51 along the second direction b. The adjusting sleeve 53 rotates along the first direction a to gradually increase the gear, until the adjusting sleeve 53 rotates to abut against the extension arm 512 along the first direction a. At this time, the mode switching member 51 is in the first position and the impact drill 100 is in the drilling mode.

[0085] Furthermore, such as Figure 6 As shown, the extension arm 512 includes a first extension portion 5121, a connecting portion 5122, and a second extension portion 5123 connected in sequence, with the length of the connecting portion 5122 extending axially. Figure 9 As shown, when the mode switch 51 is in the first position, the axial movement of the first extension 5121 is restricted, so that the mode switch 51 cannot move axially, and the toggle part 531 abuts against the second extension 5123 along the first direction a, as shown. Figure 9 and Figure 12 As shown, the adjusting sleeve 53 pushes the second extension 5123 through the toggle part 531 to push the mode switching member 51 from the first position to the second position.

[0086] In one implementation, such as Figure 4As shown, the inner wall of the gearbox 1 is provided with a boss 13, and the boss 13 is provided with a second limiting groove 131. The circumferential surface of the stationary ratchet 4 is provided with a snap-fit ​​protrusion 41, which snaps into the second limiting groove 131 to restrict the rotation of the stationary ratchet 4. The installation of the stationary ratchet 4 is simple and convenient. Furthermore, in order to improve the stability of the snap-fit ​​between the gearbox 1 and the stationary ratchet 4, there are multiple bosses 13. All bosses 13 are evenly spaced along the circumference of the stationary ratchet 4. The number and position of the second limiting grooves 131 are matched with the bosses 13, and one boss 13 snaps into one second limiting groove 131.

[0087] It should be understood that in this article, "front" or "front side" refers to the direction in which the output shaft 2 of the impact drill 100 faces the workpiece (such as a template or wall) during operation, while "rear" or "rear side" indicates the opposite direction. In this article, "axial movement," "axial forward movement," and "axial backward movement" refer to the direction of extension of the central axis of the output shaft 2.

[0088] 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: A gearbox, which houses the transmission mechanism, has clearance grooves on its inner wall; Output shaft, which is used to mount the drill bit and output working power; A movable ratchet, which is fixedly sleeved on the output shaft; A stationary ratchet is mounted on the inner wall of the gearbox, and the output shaft moves axially through the stationary ratchet. A mode switcher includes a connected annular portion and an extension arm, the annular portion being located within the gearbox and movably fitted onto the output shaft; the mode switcher can switch between a first position and a second position by rotation. A reset elastic element, comprising a first end limited to the mode switching element and a second end limited to the stationary ratchet; When the mode switching component is in the first position, the extension arm is restricted from moving along the axial direction of the output shaft, the mode switching component restricts the axial movement of the output shaft, the moving ratchet and the stationary ratchet do not contact each other, and the impact drill is in drilling mode. During the process of the mode switching component rotating from the first position to the second position, the clearance groove is used to avoid the displacement of the first end in the radial direction of the output shaft; When the mode switching component is in the second position, the extension arm can move along the axial direction, so that the output shaft can move axially, thereby enabling the moving ratchet and the stationary ratchet to engage, and the impact drill is in impact mode.

2. The impact drill according to claim 1, characterized by The impact drill also includes a front bearing, which is sleeved on the output shaft; When the mode switching component is in the first position, the moving ratchet and the front bearing together clamp the mode switching component.

3. The impact drill according to claim 1, characterized by The annular portion is provided with a first limiting groove, and the first end is inserted into the first limiting groove. The first limiting groove is used to restrict the first end from rotating relative to the annular portion.

4. The impact drill according to claim 3, characterized in that, The reset elastic element further includes a spiral portion, with the first end and the second end respectively connected to the two ends of the spiral portion; the spiral portion abuts against the annular portion forward.

5. The impact drill according to any one of claims 1 to 4, characterized in that, The front end of the gearbox is provided with a notch, the notch includes a first abutting part and a second abutting part that are staggered along the rotation direction of the mode switching component, the first abutting part and the second abutting part are staggered along the direction from front to back; When the mode switching component is in the first position, the first abutting part abuts against the extension arm to prevent the mode switching component from moving axially backward; When the mode switching member is in the second position, the extension arm and the second abutment are opposite each other in the axial direction and there is a gap L1 between them, which allows the extension arm to move along the axial direction.

6. The impact drill according to claim 5, characterized by The annular portion is provided with a first limiting groove for inserting the first end. The first limiting groove is located on the side of the extension arm facing the clearance groove, and the first limiting groove is disposed close to the extension arm. The clearance groove is located on the side of the second abutment portion away from the first abutment portion, and the clearance groove is connected to the notch.

7. The impact drill according to claim 6, characterized in that, One sidewall of the extension arm forms the groove wall of the first limiting groove.

8. The impact drill according to any one of claims 1 to 4, characterized by, The impact drill also includes an adjusting sleeve, which is rotatably mounted on the gearbox and at least partially fitted onto the outside of the gearbox. The inner wall of the adjusting sleeve is provided with a toggle part. When the mode switching component is in the first position, the toggle part abuts against the extension arm in the first direction; When the adjusting sleeve rotates in the first direction, the actuating part actuates the extending arm to drive the mode switching member to rotate from the first position to the second position, and the reset elastic member is twisted due to compression. When the adjusting sleeve rotates in the second direction, the reset elastic element rebounds, thereby driving the mode switching element to rotate from the second position to the first position; The first direction is opposite to the second direction.

9. The impact drill according to claim 8, characterized by The extension arm includes a first extension, a connecting part, and a second extension connected in sequence, and the length of the connecting part extends along the axial direction; When the mode switch is in the first position, the axial movement of the first extension is restricted so that the mode switch cannot move along the axial direction, and the toggle part abuts against the second extension in the first direction.

10. The impact drill according to any one of claims 1 to 4, characterized by, The inner wall of the gearbox is provided with a boss, and the boss is provided with a second limiting groove; The stationary ratchet has a snap-fit ​​protrusion on its circumferential surface wall. The snap-fit ​​protrusion engages with the second limiting groove to restrict the rotation of the stationary ratchet.

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