Multi-gear quick shift knob structure of electric hammer

Abstract

A multi-gear quick-shift knob structure for an electric hammer, belonging to the field of power tool technology, includes a housing and a knob mounted on the housing. The housing contains a working drive component and a shifter for switching the gears of the working drive component. The shifter is fixedly connected to the knob and shifts gears as the knob rotates. The housing has a gear groove, and a button is elastically connected to the knob. The button engages with the gear groove to limit the knob's position. When the knob is turned to different gears, the button elastically engages with the gear groove on the housing. The button's elastic impact produces a crisp sound, providing feedback to the user and allowing them to determine whether the gear shift is complete. Simultaneously, the engagement of the button with the gear groove ensures the knob maintains gear stability under high-vibration conditions such as hammering and impact.

Description

Technical Field

[0001] This utility model belongs to the field of power tool technology, specifically to a multi-gear quick-shift knob structure for an electric hammer. Background Technology

[0002] When using lithium-ion electric hammer tools, different working modes need to be switched via a knob to adapt to different working environments. During extended use, we have found that most electric hammer knobs on the market suffer from the following problems: unclear gear positions, making it difficult to perceive the gear shift point; risk of misoperation, as the knob can easily disengage due to inertia in vibrating environments; and poor linearity of operating torque, requiring continuous application of peak torque for gear shifting, leading to user fatigue. Utility Model Content

[0003] In view of this, the purpose of this utility model is to overcome the shortcomings of the prior art and provide a multi-gear quick-shift knob structure for electric hammers. This application provides the following technical solution: The device includes a housing and a knob mounted on the housing. The housing contains a working drive component and a gear shifter for switching the gears of the working drive component. The gear shifter is fixedly connected to the knob and shifts gears as the knob rotates. The housing has a gear position groove, and a button is elastically connected to the knob. The button engages with the gear position groove to limit the knob's position.

[0004] The working drive component includes a drive shaft, on which a small spur gear and a rocker bearing are mounted. The small spur gear meshes with a large spur gear, and the rocker bearing is connected to a hammer. A gear coupling and a rocker bearing coupling are also slidably mounted on the drive shaft. The gear coupling is used to connect the small spur gear and the drive shaft for transmission, and the rocker bearing coupling is used to connect the rocker bearing and the drive shaft for transmission. The shifter is provided with multiple ribs, and the gear coupling and the rocker bearing coupling contact the ribs as the shifter rotates, and are driven to slide along the drive shaft.

[0005] A guide post is fixed inside the housing on one side of the large spur gear. A locking plate is slidably mounted on the guide post. The locking plate is L-shaped, with a locking tooth at one end near the large spur gear to engage with and restrict its movement. The other end has a guide portion near the gear shifter for engaging with the gear shifter. The bone contact is pushed to make the locking plate slide along the guide post.

[0006] The small spur gear, the gear coupling, the rocking bearing coupling, and the rocking bearing are sequentially mounted on the transmission shaft, and a return spring is provided between the gear coupling and the rocking bearing coupling.

[0007] The guide post is equipped with a push spring that pushes the locking plate toward the large spur gear.

[0008] The bone position includes a recess, a first shift tooth, and a second shift tooth arranged around the shifter; when the guide portion contacts the recess, the shift tooth engages with the large spur gear; the first shift tooth is used to move the gear coupling along the drive shaft away from the small spur gear as the shifter rotates; the second shift tooth is used to move the rocker bearing coupling along the drive shaft away from the rocker bearing as the shifter rotates.

[0009] The knob has a knob groove, the button is slidably installed in the knob groove, the bottom of the button has a protrusion, the housing also has a sliding groove, the protrusion slides along the sliding groove, the gear position groove is provided on one side of the sliding groove, and a button spring is provided in the knob groove to push the button into the gear position groove.

[0010] The shifter is provided with a directional protrusion. The shifter is connected to the bottom of the knob by a screw thread, and the directional protrusion is engaged in the recess at the bottom of the knob. The housing is provided with a contour hole corresponding to the shape of the shifter. The contour hole is used to install or remove the shifter into the housing when the shifter is facing the same direction as the housing.

[0011] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are: When the knob is turned to different gears, a button on the knob engages with a gear slot on the housing. The button's elastic impact produces a crisp sound, providing feedback to the user and helping them determine if the gear shift is complete. Simultaneously, the engagement of the button and gear slot ensures the knob remains stable under high-vibration conditions such as hammering or impact. Furthermore, the locking plate, under the action of the push spring, continuously applies elastic pressure to the shifter, which is converted into torsional force through the guide section. This, combined with the engagement of the button and gear slot, maintains the knob's stability, preventing it from wobbling. Gear shifting is achieved by the shifter pushing the locking plate or the gear coupling and rocker bearing coupling. The locking plate, gear coupling, and rocker bearing coupling are reset by springs. Different gears require different spring forces, and only one spring force needs to be overcome. As the knob is turned, the spring force increases, reducing peak torque and making the transition smoother, significantly improving operational comfort. Additionally, contour holes are provided on the housing, allowing the shifter to be removed for repair.

[0012] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of a single hammer setting using a multi-gear quick-shift knob structure for an electric hammer.

[0015] Figure 2 This is a schematic diagram of a drill bit adjustment mechanism with a multi-gear quick-shift knob structure for an electric hammer.

[0016] Figure 3 This is a schematic diagram of a multi-gear quick-shift knob structure for an electric hammer drill.

[0017] Figure 4 This is a schematic diagram of a multi-gear quick-shift knob structure for an electric hammer.

[0018] Figure 5 This is a cross-sectional view of a multi-gear quick-shift knob structure for an electric hammer.

[0019] Figure 6 This is a schematic diagram of the multi-gear quick-shift knob structure of an electric hammer and the assembly of the knob and shifter.

[0020] Figure 7 This is a schematic diagram of a multi-gear quick-shift knob structure for an electric hammer.

[0021] Reference numerals: 1. Housing; 11. Gear slot; 12. Guide post; 13. Slide groove; 14. Contour hole; 2. Knob; 21. Button; 211. Protrusion; 22. Knob slot; 23. Button spring; 3. Gear shifter; 31. Bone position; 311. Recess; 312. First shift tooth; 313. Second shift tooth; 32. Directional protrusion; 33. Screw; 4. Drive shaft; 41. Small spur gear; 42. Gear coupling; 43. Rocker bearing coupling; 44. Rocker bearing; 45. Return spring; 5. Large spur gear; 6. Hammer; 7. Locking plate; 71. Clamping tooth; 72. Guide part; 73. Push spring. Detailed Implementation

[0022] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0023] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., shall be interpreted broadly. For example, they may refer to a fixed connection, a detachable connection, or an integral part; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; they may refer to two... The term refers to the internal connectivity of an element or the interaction between two elements. Those skilled in the art will understand the specific meaning of these terms in this application based on the specific circumstances.

[0024] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0025] Please refer to Figure 1-7 As shown, this utility model provides a multi-gear quick-shift knob structure for an electric hammer, including a housing 1, a knob 2 mounted on the housing 1, a working drive component and a shifter 3 for switching the gears of the working drive component inside the housing 1, the shifter 3 being fixedly connected to the knob 2 and shifting gears as the knob 2 rotates; a gear groove 11 is provided on the housing 1, and a button 21 is elastically connected to the knob 2, the button 21 being used to engage with the gear groove 11 to limit the knob 2.

[0026] The working drive component includes a drive shaft 4, on which a small spur gear 41 and a rocker bearing 44 are mounted. The small spur gear 41 meshes with a large spur gear 5. The rocker bearing 44 is connected to a hammer 6. A gear coupling 42 and a rocker bearing coupling 43 are also slidably mounted on the drive shaft 4. The gear coupling 42 is used to connect the small spur gear 41 and the drive shaft 4 for transmission, and the rocker bearing coupling 43 is used to connect the rocker bearing 44 and the drive shaft 4 for transmission. The shifter 3 is provided with multiple ribs 31. The gear coupling 42 and the rocker bearing coupling 43 contact the ribs 31 as the shifter 3 rotates and are driven to slide along the drive shaft 4.

[0027] Inside the housing 1, a guide post 12 is fixed on one side of the large spur gear 5. A locking plate 7 is slidably mounted on the guide post 12. The locking plate 7 is L-shaped, with a locking tooth 71 at one end. The locking tooth 71 is close to the large spur gear 5 and is used to engage with the large spur gear 5 to restrict its movement. The other end has a guide part 72, which is close to the shifter 3 and is used to contact the rib 31 of the shifter 3. When pushed, the locking plate 7 slides along the guide post 12.

[0028] The small spur gear 41, gear coupling 42, rocker bearing coupling 43, and rocker bearing 44 are sequentially installed on the transmission shaft 4, and a return spring 45 is provided between the gear coupling 42 and the rocker bearing coupling 43.

[0029] The guide post 12 is equipped with a push spring 73 that pushes the locking plate 7 toward the large spur gear 5.

[0030] The bone position 31 includes a recess 311, a first shift tooth 312, and a second shift tooth 313 that are arranged around the shifter 3. When the guide part 72 contacts the recess 311, the locking tooth 71 engages with the large spur gear 5. The first shift tooth 312 is used to move the gear coupling 42 along the drive shaft 4 away from the small spur gear 41 as the shifter 3 rotates. The second shift tooth 313 is used to move the rocker bearing coupling 43 along the drive shaft 4 away from the rocker bearing 44 as the shifter 3 rotates.

[0031] A knob groove 22 is provided inside the knob 2, and the button 21 is slidably installed in the knob groove 22. The bottom of the button 21 has a protrusion 211, and a slide groove 13 is also provided on the housing 1. The protrusion 211 slides along the slide groove 13. The gear position groove 11 is provided on one side of the slide groove 13. A button spring 23 is provided in the knob groove 22 to push the button 21 into the gear position groove 11.

[0032] The shifter 3 is provided with a directional protrusion 32. The shifter 3 is threaded to the bottom of the knob 2 by a screw 33, and the directional protrusion 32 is engaged in the recess at the bottom of the knob 2. The housing 1 is provided with a contour hole 14 corresponding to the shape of the shifter 3. The contour hole 14 is used to install or remove the shifter 3 into the housing 1 when the shifter 3 is facing the same direction as it.

[0033] Furthermore, such as Figure 5 As shown, the large spur gear 5 is coaxially fixed on the main shaft of the electric hammer. When the large spur gear 5 rotates, it drives the main shaft of the electric hammer to rotate. A piston is slidably installed inside the main shaft of the electric hammer. The hammer 6 is fixed to the front end of the piston, and the rear end of the piston is hinged to the rocker bearing 44. One end of the transmission shaft 4 is connected to the electric motor and rotates with the main shaft of the electric motor. Figure 1 , 2As shown in Figure 4, a spline is provided in the middle of the transmission shaft 4. Both the gear coupling 42 and the rocker bearing coupling 43 are engaged with the keyway of this spline. No keyway is provided between the small spur gear 41 and the rocker bearing 44 and the transmission shaft 4. The small spur gear 41 and the rocker bearing 44 can rotate on the transmission shaft 4. The side of the small spur gear 41 near the gear coupling 42 is provided with a spline that engages with the internal groove of the gear coupling 42. This allows the gear coupling 42 to slide onto the spline and engage with the keyway, thus fixing the small spur gear 41 to the transmission shaft 4 and achieving coupling. The side of the rocker bearing 44 near the rocker bearing coupling 43 is provided with a convex key. The rocker bearing coupling 43 is provided with a corresponding groove. The rocker bearing coupling 43 slides so that its groove engages with the convex key, thus achieving coupling.

[0034] In specific implementation, such as Figure 1 As shown, when the knob 2 is turned to the single hammer position, the first gear 312 on the shifter 3 moves the gear coupling 42 to slide away from the small spur gear 41 along the transmission shaft 4, disconnecting the transmission between the transmission shaft 4 and the small spur gear 41. At the same time, the recess 311 aligns with the locking plate 7, and the push spring 73 pushes the locking plate 7, so that the guide part 72 contacts the recess 311, and the locking tooth 71 engages with the large spur gear 5, restricting the rotation of the large spur gear 5. At this time, the electric motor is started, the transmission shaft 4 rotates, the small spur gear 41 is not coupled and does not rotate, the rocker bearing 44 is coupled and rotates, driving the piston and hammer 6 to reciprocate, outputting hammer blows.

[0035] like Figure 2 As shown, when the knob 2 is turned to the drill bit adjustment position, the first gear 312 keeps the gear coupling 42 sliding away from the small spur gear 41 along the transmission shaft 4, disconnecting the transmission between the transmission shaft 4 and the small spur gear 41. However, the recess 311 is not aligned with the locking plate 7. The locking plate 7 is pushed by the shifter 3, and the push spring 73 is compressed. The locking tooth 71 does not engage with the large spur gear 5, and does not restrict the rotation of the large spur gear 5. At this time, the drill bit can be freely rotated and adjusted. The drill bit drives the electric hammer spindle and the large spur gear 5 to rotate. The small spur gear 41 meshes with the large spur gear 5 and rotates on the transmission shaft 4.

[0036] like Figure 3 As shown, when the knob 2 is turned to the drill hammer position, the first gear 312 on the shifter 3 is not in contact with the gear coupling 42. The gear coupling 42 is pushed by the return spring 45 and slides along the transmission shaft 4 to approach the small spur gear 41 and is coupled with the small spur gear 41. At the same time, the recess 311 is not aligned with the locking plate 7. The locking plate 7 is pushed by the shifter 3, and the push spring 73 is compressed. The locking tooth 71 is not engaged with the large spur gear 5 and does not restrict the rotation of the large spur gear 5. At this time, the electric motor is started, the transmission shaft 4 rotates, the small spur gear 41 is coupled and rotates, meshing with the large spur gear 5 to rotate, the electric hammer spindle rotates, and outputs drill blows. At the same time, the rocker bearing 44 is coupled and rotates, driving the piston and hammer 6 to reciprocate and output hammer blows.

[0037] like Figure 4 As shown, when the knob 2 is turned to the rotary position, the second gear 313 on the shifter 3 moves the rocker bearing coupling 43 to slide away from the rocker bearing 44 along the drive shaft 4, disconnecting the transmission between the drive shaft 4 and the rocker bearing 44. The first gear 312 does not contact the gear coupling 42. The gear coupling 42 is pushed by the return spring 45 and slides along the drive shaft 4 to approach the small spur gear 41, coupling with the small spur gear 41. At the same time, the recess 311 is not aligned with the locking plate 7. The locking plate 7 is pushed by the shifter 3, and the push spring 73 is compressed. The locking tooth 71 does not engage with the large spur gear 5, and does not restrict the rotation of the large spur gear 5. At this time, the electric motor is started, the drive shaft 4 rotates, the small spur gear 41 coupling rotates, meshing with the large spur gear 5 to rotate, the electric hammer spindle rotates, and outputs drilling blows. The rocker bearing 44 is not coupled and does not rotate, so it does not drive the piston and hammer 6 to reciprocate, nor does it output hammer blows.

[0038] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A multi-gear quick-shift knob structure for an electric hammer, characterized in that: The device includes a housing (1) and a knob (2) mounted on the housing (1). The housing (1) contains a working drive component including a drive shaft (4), a small spur gear (41), a large spur gear (5), a rocker bearing (44), and a hammer (6), as well as a gear shifter (3) for switching the gears of the working drive component. The gear shifter (3) is fixedly connected to the knob (2) and shifts gears as the knob (2) rotates. The housing (1) has a gear position groove (11), and the knob (2) is elastically connected to a button (21). The button (21) is used to engage with the gear position groove (11) to limit the knob (2).

2. The multi-gear quick-shift knob structure for an electric hammer as described in claim 1, characterized in that: The working drive component includes a drive shaft (4), on which a small spur gear (41) and a rocker bearing (44) are mounted. The small spur gear (41) meshes with a large spur gear (5). The rocker bearing (44) is connected to a hammer (6). A gear coupling (42) and a rocker bearing coupling (43) are also slidably mounted on the drive shaft (4). The gear coupling (42) is used to connect the small spur gear (41) and the drive shaft (4) for transmission. The rocker bearing coupling (43) is used to connect the rocker bearing (44) and the drive shaft (4) for transmission. The shifter (3) is provided with multiple bone positions. (31) The gear coupling (42) and the rocking bearing coupling (43) rotate with the shifter (3) and come into contact with the bone position (31), and are driven to slide along the transmission shaft (4).

3. The multi-gear quick-shift knob structure for an electric hammer as described in claim 2, characterized in that: Inside the housing (1), a guide post (12) is fixed on one side of the large spur gear (5). A locking plate (7) is slidably mounted on the guide post (12). The locking plate (7) is L-shaped, with a locking tooth (71) at one end. The locking tooth (71) is close to the large spur gear (5) and is used to engage with the large spur gear (5) to restrict its movement. The other end has a guide part (72) close to the gear shifter (3) and is used to contact the bone position (31) of the gear shifter (3). When pushed, the locking plate (7) slides along the guide post (12).

4. The multi-gear quick-shift knob structure for an electric hammer as described in claim 3, characterized in that: The small spur gear (41), the gear coupling (42), the rocking bearing coupling (43), and the rocking bearing (44) are sequentially installed on the transmission shaft (4), and a return spring (45) is provided between the gear coupling (42) and the rocking bearing coupling (43).

5. The multi-gear quick-shift knob structure for an electric hammer as described in claim 3, characterized in that: The guide post (12) is provided with a push spring (73) that pushes the locking plate (7) toward the large spur gear (5).

6. The multi-gear quick-shift knob structure for an electric hammer as described in claim 4, characterized in that: The bone position (31) includes a recess (311) surrounding the shifter (3), a first shift tooth (312), and a second shift tooth (313); when the guide part (72) contacts the recess (311), the snap tooth (71) engages with the large spur gear (5), the first shift tooth (312) is used to rotate with the shifter (3) to move the gear coupling (42) along the transmission shaft (4) away from the small spur gear (41); the second shift tooth (313) is used to rotate with the shifter (3) to move the rocker bearing coupling (43) along the transmission shaft (4) away from the rocker bearing (44).

7. The multi-gear quick-shift knob structure for an electric hammer as described in claim 1, characterized in that: The knob (2) is provided with a knob groove (22), the button (21) is slidably installed in the knob groove (22), the button (21) has a protrusion (211) at the bottom, the housing (1) is also provided with a sliding groove (13), the protrusion (211) slides along the sliding groove (13), the gear groove (11) is provided on one side of the sliding groove (13), and the knob groove (22) is provided with a button spring (23) that pushes the button (21) towards the gear groove (11).

8. The multi-gear quick-shift knob structure for an electric hammer as described in claim 6, characterized in that: The shifter (3) is provided with a directional protrusion (32). The shifter (3) is threaded to the bottom of the knob (2) by a screw (33) and the directional protrusion (32) is engaged in the recess at the bottom of the knob (2). The housing (1) is provided with a contour hole (14) corresponding to the shape of the shifter (3). The contour hole (14) is used to install or remove the shifter (3) into the housing (1) when the shifter (3) is facing the same direction as the shifter (3).

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