Torque-adjustable brushless motor lithium electric drill

Abstract

The torque-adjustable brushless motor lithium electric drill comprises an electric drill body and a battery pack, a mounting seat for mounting the battery pack is arranged on the lower side of the electric drill body, a mounting groove is formed in the mounting seat, a sliding groove with a smooth top face and a rough bottom face is formed in the inner side wall of the mounting groove, an elastic locking piece is arranged in the sliding groove in a sliding mode, and the elastic locking piece is connected with the battery pack. A gap is formed between the elastic locking piece and the top face of the sliding groove, the elastic locking piece is provided with a first inclined face and a second inclined face, the battery pack shell is provided with a third inclined face and a fourth inclined face which are matched with the first inclined face and the second inclined face respectively, and the battery pack is provided with a limiting groove capable of limiting the elastic locking piece. Compared with the prior art, the utility model has the advantages that the battery pack is convenient and quick to mount, and the battery pack can be taken down only by using a certain force in the dismounting process of the battery pack, so that the battery pack is prevented from falling off under the condition of misoperation.

Description

Technical Field

[0001] The utility model relates to the technical field of electric drills, in particular to a lithium-powered electric drill with a brushless motor capable of modulating torque. Background Art

[0002] An electric drill is a portable drilling tool that uses electricity as power. It consists of a small motor, a control switch, a drill chuck and a drill bit. It is widely used in industries such as construction, decoration, and furniture. The body and battery pack of a traditional electric drill are fixed. When the battery pack is damaged, the entire electric drill is scrapped, resulting in high cost of use. For this reason, some electric drills with detachable battery packs have appeared on the market.

[0003] For example, the Chinese utility model patent "An electric drill with convenient loading and unloading of battery packs" with patent announcement number CN201168806Y includes a body and a battery pack shell. The middle part of the upper end surface of the battery pack shell is provided with an upwardly convex connecting platform, and the left and right sides of the connecting platform each have a guide groove opening outward. The lower end surface of the body is provided with an inner recess into which the connecting platform can be inserted forward, and the left and right sides of the inner recess each have an inner protrusion and a guide rib that is plugged into the guide groove. The battery pack shell is provided with a button that can move up and down relative to it, and the front end of the button is exposed in front of the upper part of the battery pack shell to form a pressing part, and the rear end of the button is exposed behind the upper part of the battery pack shell to form a buckle part. A locking groove for the buckle part to be engaged is provided at the corresponding position of the lower end surface of the body, and a spring that can apply an upward elastic force to the button is provided at the lower part of the button.

[0004] In the above solution, when the electric drill is in use, when the gravity direction of the battery pack is consistent with the direction in which the guide slot slides out, accidentally touching the guide button will cause the battery pack to fall off, thereby affecting the normal operation of the electric drill. Utility Model Content

[0005] The utility model aims to solve the problem that a battery pack may fall off due to an accidental touch during the use of an electric drill, and the technical problem to be solved by the utility model is to provide a lithium-powered electric drill with a brushless motor and adjustable torque.

[0006] The technical solution adopted by the utility model to solve the above technical problems is as follows: the utility model comprises an electric drill body and a battery pack, wherein a mounting seat for mounting the battery pack is provided at the lower side of the electric drill body, a mounting slot is provided on the mounting seat, a sliding slot with a smooth top surface and a rough bottom surface is provided on the inner side wall of the mounting slot, an elastic locking piece is provided for sliding in the sliding slot, a gap is formed between the elastic locking piece and the top surface of the sliding slot, a first inclined surface and a second inclined surface are provided on the elastic locking piece, and a third inclined surface and a fourth inclined surface are provided on the battery pack shell which respectively cooperate with the first inclined surface and the second inclined surface. The battery pack is provided with a limiting groove which can limit the elastic locking piece. When installing, the battery pack is inserted into the mounting seat, and the third inclined surface pushes and squeezes the second inclined surface so that the elastic locking piece slides into the slide groove and abuts against the top surface of the slide groove. When the battery pack slides to the limit groove corresponding to the elastic locking piece, the elastic limiting piece slides along the top surface into the limit groove under the elastic force to lock the battery pack; when disassembling, the battery pack is pulled downward, and the fourth inclined surface pushes and squeezes the first inclined surface so that the elastic locking piece slides into the slide groove and disengages from the slide groove, thereby releasing the limitation on the battery pack.

[0007] A further preferred solution of the utility model is that the elastic locking member includes a reset spring and a sliding block, one end of the reset spring abuts against the inner wall of the mounting seat, and the other end abuts against one end of the sliding block.

[0008] A further preferred solution of the utility model is: the sliding block has a sliding portion and a limiting portion, the sliding portion is a polygonal cylinder, the first inclined surface and the second inclined surface are located on the limiting portion, and the connection between the first inclined surface and the second inclined surface is a curved surface of sliding transition.

[0009] A further preferred solution of the utility model is that the sliding part is a rectangular column, and the surface of the rectangular column that abuts against the installation sliding surface is a rough surface.

[0010] A further preferred solution of the utility model is that the limiting portion is a vertebral body, and the end surface of the vertebral body is a spherical surface.

[0011] A further preferred solution of the utility model is: a first baffle is fixedly provided on both side walls of the slot opening, and a second baffle cooperating with the first baffle is provided on both sides of the end of the sliding block close to the return spring.

[0012] A further preferred solution of the utility model is that the connection between the third inclined surface and the fourth inclined surface is a curved surface with a smooth transition.

[0013] A further preferred solution of the present invention is that when the battery pack is locked with the elastic locking member, the other side of the battery pack is tightly against the inner wall of the mounting seat.

[0014] A further preferred solution of the utility model is: the electric drill body includes two shells plugged into each other, a circuit board, a motor, a transmission mechanism and an electric drill output shaft connected to the transmission mechanism are arranged in the shell, the circuit board is electrically connected to the battery pack, the motor is electrically connected to the circuit board, and the output end of the motor is connected to the input end of the transmission mechanism.

[0015] A further preferred solution of the utility model is that the motor is a brushless motor.

[0016] Compared with the prior art, the utility model has the following advantages: a slide groove with a smooth top surface and a rough bottom surface is provided on the inner side wall of the installation groove of the base, and an elastic locking member with a gap with the top surface of the slide groove is slidably provided in the slide groove; the first inclined surface and the second inclined surface of the elastic locking member are respectively matched with the third inclined surface and the fourth inclined surface of the battery pack to achieve the installation, fixing and disassembly of the battery pack; since the top surface of the slide groove is smoothly arranged, during the installation of the battery pack, the battery pack can be quickly installed with a slight push; the bottom surface of the slide groove is roughly arranged, and a certain force is required to remove the battery pack during the disassembly process to prevent the battery pack from falling off in the event of misoperation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be described in further detail below in conjunction with the accompanying drawings and preferred embodiments. However, those skilled in the art will appreciate that these drawings are drawn only for the purpose of explaining the preferred embodiments and should not be regarded as limiting the scope of the present invention. Furthermore, unless otherwise specified, the drawings only conceptually represent the composition or structure of the described objects and may contain exaggerated displays, and the drawings are not necessarily drawn to scale.

[0018] Figure 1 This is a schematic diagram of the three-dimensional structure of a preferred embodiment of the utility model;

[0019] Figure 2 This is a front view of a preferred embodiment of the utility model;

[0020] Figure 3 This is the preferred embodiment of the utility model Figure 2 Sectional view of AA in the middle;

[0021] Figure 4 This is the preferred embodiment of the utility model Figure 3 A partial enlarged view of point B in the middle;

[0022] Figure 5 This is a schematic diagram of the three-dimensional structure of the elastic locking member of the preferred embodiment of the utility model;

[0023] Figure 6 This is a bottom-up stereoscopic structural diagram of the electric body and the mounting base of the preferred embodiment of the utility model;

[0024] In the figure: 1. electric drill body; 2. battery pack; 21. third inclined plane; 22. fourth inclined plane; 23. limiting groove; 3. mounting seat; 31. mounting groove; 32. slide groove; 33. first baffle; 4. elastic locking member; 41. first inclined plane; 42. second inclined plane; 43. return spring; 44. sliding block; 441. sliding part; 442. limiting part; 45. second baffle. DETAILED DESCRIPTION

[0025] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are only descriptive and exemplary and should not be construed as limiting the protection scope of the present invention.

[0026] It should be noted that like reference numerals denote similar items in the following drawings, and thus, once an item is defined in one drawing, it may not be further defined or explained in subsequent drawings.

[0027] This embodiment mainly describes a lithium-ion electric drill with a brushless motor and adjustable torque, as follows:

[0028] like Figures 1 to 6A torque-adjustable brushless motor lithium-ion electric drill is shown, comprising an electric drill body 1 and a battery pack 2. A mounting seat 3 for mounting the battery pack 2 is provided on the lower side of the electric drill body 1. A mounting groove 31 is provided on the mounting seat 3. A slide groove 32 with a smooth top surface and a rough bottom surface is provided on the inner side wall of the mounting groove 31. An elastic locking member 4 is slidably provided in the slide groove 32. There is a gap between the elastic locking member 4 and the top surface of the slide groove 32. A first inclined surface 41 and a second inclined surface 42 are provided on the elastic locking member 4. A third inclined surface 21 and a fourth inclined surface 22 respectively cooperating with the first inclined surface 41 and the second inclined surface 42 are provided on the shell of the battery pack 2. A limiting groove 23 for limiting the elastic locking member 4 is provided on the battery pack 2. The shape of the limiting groove 23 is adapted to the elastic locking member 4. When installing, extend the battery pack 2 into the mounting seat 3 and push the battery pack 2 upward. At this time, the third inclined surface 21 pushes and squeezes the second inclined surface 42 to make the elastic locking member 4 move toward the top surface and slide into the slide groove 32, and abut against the top surface of the slide groove 32 during sliding. When the battery pack 2 slides to the limit groove 23 corresponding to the elastic locking member 4, the elastic locking member 4 slides along the top surface into the limit groove 23 under the elastic force to lock the battery pack 2. Since the top surface of the slide groove 32 is smoothly set, during the installation process of the battery pack 2, the battery pack 2 can be quickly installed by just slightly pushing it. During disassembly, pull the battery pack 2 downward, the fourth inclined surface 22 pushes and squeezes the first inclined surface 41, so that the elastic locking member 4 slides along the bottom surface of the slide groove 32 into the slide groove 32 and disengages from the slide groove 32, thereby releasing the limit of the battery pack 2. Since the bottom surface of the slide groove 32 is rough, a certain amount of force is required to remove the battery pack 2 during the disassembly process of the battery pack 2 to prevent the battery pack 2 from falling off in the event of misoperation.

[0029] like Figure 4 and Figure 5 As shown, the elastic locking member 4 includes a return spring 43 and a sliding block 44, one end of the return spring 43 abuts against the inner wall of the mounting seat 3, and the other end abuts against one end of the sliding block 44. During the installation of the battery pack 2, due to the extrusion of the first inclined surface 41, the return spring 43 is deformed and compressed. When the limiting groove 23 of the battery pack 2 corresponds to the sliding block, the return spring 43 is reset and exerts elastic force on the sliding block, so that the sliding block generates pressure on the battery pack 2, thereby locking the battery pack 2. When the battery pack 2 is locked by the elastic locking member 4, the other side of the battery pack 2 is tightly attached to the inner wall of the mounting seat 3. Since the bottom surface of the sliding groove 32 is rough, in the locked state, the sliding block 44 will not slide under the action of friction, thereby avoiding the problem of the sliding block 44 sliding under the gravity of the battery pack 2 during use, causing the battery pack 2 to fall off.

[0030] Preferably, the sliding block 44 has a sliding portion 441 and a limiting portion 442, the sliding portion 441 contacts the top and bottom surfaces of the slide groove 32 and slides along the slide groove 32, the limiting portion 442 is used to limit the battery pack 2, the sliding portion 441 is a polygonal cylinder, the polygonal body has sliding surfaces with the top and bottom surfaces of the slide groove 32, and the polygonal body does not rotate during the sliding process, the first inclined surface 41 and the second inclined surface 42 are located on the limiting portion 442, and the connection between the first inclined surface 41 and the second inclined surface 42 is a curved surface of sliding transition, and the curved surface setting can reduce the wear of the sliding block 44 and the limiting groove 23 during the installation and disassembly of the battery pack 2, and the limiting portion 442 can be a cone, and the end face of the cone is a spherical surface.

[0031] Preferably, the sliding portion 441 is a rectangular cylinder, and the surface of the rectangular cylinder that is in contact with the bottom surface of the slide groove 32 is a rough surface, which increases the contact area between the sliding block 44 and the slide groove 32, thereby enhancing the friction between the two, so that the battery pack 2 has a stable structure after installation and is not easy to slip.

[0032] Preferably, a first baffle 33 is fixedly provided on both side walls of the notch of the slide groove 32, and a second baffle 45 cooperating with the first baffle 33 is provided on both sides of the end of the sliding block 44 close to the return spring 43, and the distance between the two first baffles 33 is greater than or equal to the width of the sliding block 44 and less than or equal to the distance between the two second baffles 45. The cooperation between the first baffle 33 and the second baffle 45 can ensure that the sliding block 44 slides along the slide groove 32 without falling out of the slide groove 32.

[0033] Preferably, the connection between the third inclined surface 21 and the fourth inclined surface 22 is a curved surface with a smooth transition. The curved surface setting can reduce the wear of the battery pack 2, thereby extending the service life of the battery pack 2.

[0034] Preferably, the electric drill body 1 includes two shells plugged into each other, and a circuit board, a motor, a transmission mechanism and an electric drill output shaft connected to the output end of the transmission mechanism are arranged in the shell. The circuit board is electrically connected to the battery pack 2, and the motor is electrically connected to the circuit board and transmits energy from the battery pack 2 to the motor. The output end of the motor is connected to the input end of the transmission mechanism to drive the transmission mechanism to rotate, thereby driving the output shaft of the electric drill to rotate. The battery pack 2 is a lithium battery pack, the motor is a brushless motor, and the transmission mechanism is a planetary gear mechanism. The planetary gear mechanism is a structure such as the one in patent publication number CN103878730B, and the torque adjustment method of this scheme is also consistent with the method in patent publication number CN103878730B.

[0035] In the description of the present utility model, it should be noted that the terms "upper", "lower", "front", "back", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present utility model.

[0036] The above is a detailed introduction to a torque-adjustable brushless motor lithium-powered drill provided by the utility model. This article uses specific examples to illustrate the principle and implementation method of the utility model. The description of the above embodiments is only used to help understand the utility model and its core ideas. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified. These improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A torque-adjustable brushless motor lithium-ion electric drill, characterized in that: The invention comprises an electric drill body and a battery pack, characterized in that: a mounting seat for mounting the battery pack is provided at the lower side of the electric drill body, a mounting groove is provided on the mounting seat, a sliding groove with a smooth top surface and a rough bottom surface is provided on the inner side wall of the mounting groove, an elastic locking member is provided for sliding in the sliding groove, a gap exists between the elastic locking member and the top surface of the sliding groove, a first inclined surface and a second inclined surface are provided on the elastic locking member, a third inclined surface and a fourth inclined surface are provided on the battery pack shell, respectively matching with the first inclined surface and the second inclined surface, and a There is a limiting groove for limiting the elastic locking piece. During installation, the battery pack is inserted into the mounting seat, and the third inclined surface pushes and squeezes the second inclined surface so that the elastic locking piece slides into the slide groove and abuts against the top surface of the slide groove. When the battery pack slides to the limit groove corresponding to the elastic locking piece, the elastic limiting piece slides along the top surface into the limit groove under the elastic force to lock the battery pack; during disassembly, the battery pack is pulled downward, and the fourth inclined surface pushes and squeezes the first inclined surface so that the elastic locking piece slides into the slide groove and disengages from the slide groove, thereby releasing the limitation on the battery pack.

2. The torque-adjustable brushless motor lithium-ion electric drill according to claim 1, characterized in that: The elastic locking member comprises a return spring and a sliding block, one end of the return spring abuts against the inner wall of the mounting seat, and the other end abuts against one end of the sliding block.

3. The torque-adjustable brushless motor lithium-ion electric drill according to claim 2, characterized in that: The sliding block has a sliding portion and a limiting portion, the sliding portion is a polygonal column, the first inclined surface and the second inclined surface are located on the limiting portion, and the connection between the first inclined surface and the second inclined surface is a curved surface with a sliding transition.

4. The torque-adjustable brushless motor lithium-ion electric drill according to claim 3, characterized in that: The sliding part is a rectangular column, and the surface of the rectangular column that abuts against the installation sliding surface is a rough surface.

5. The torque-adjustable brushless motor lithium-ion electric drill according to claim 3, characterized in that: The limiting portion is a cone, and the end surface of the cone is a spherical surface.

6. The torque-adjustable brushless motor lithium-ion electric drill according to claim 2, characterized in that: A first baffle is fixedly provided on both side walls of the slot opening, and a second baffle cooperating with the first baffle is provided on both sides of one end of the sliding block close to the return spring.

7. The torque-adjustable brushless motor lithium-ion electric drill according to claim 1, characterized in that: The connection between the third inclined surface and the fourth inclined surface is a curved surface with a smooth transition.

8. The torque-adjustable brushless motor lithium-ion electric drill according to claim 1, characterized in that: When the battery pack is locked with the elastic locking piece, the other side of the battery pack is tightly against the inner wall of the mounting seat.

9. The torque-adjustable brushless motor lithium-ion electric drill according to claim 1, characterized in that: The electric drill body includes two shells that are plugged into each other. A circuit board, a motor, a transmission mechanism and an electric drill output shaft connected to the transmission mechanism are arranged in the shell. The circuit board is electrically connected to the battery pack, the motor is electrically connected to the circuit board, and the output end of the motor is connected to the input end of the transmission mechanism.

10. The torque-adjustable brushless motor lithium-ion electric drill according to claim 9, characterized in that: The motor is a brushless motor.

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