A stopping structure for electric tools

Abstract

The present invention discloses a stopping structure for an electric tool, comprising a housing, a drive motor, and a connecting shaft, wherein the drive motor is used to drive the connecting shaft to rotate, an adjustment coupling is provided between the drive motor and the connecting shaft, the adjustment coupling comprises a first connecting body and a second connecting body, the first connecting body and the second connecting body are connected via a spline transmission with a clearance fit, a stopping groove is provided on the connecting shaft, and a stopping switch is provided on the housing, the stopping switch comprises a stopping shaft and a stopping button, when the stopping shaft is inserted into the stopping groove, the connecting shaft is limited in rotation, and one end of the stopping shaft is provided within the housing for mating with the stopping groove. The present invention provides a stopping structure for an electric tool that uses a mating structure of a stopping shaft and a stopping groove to achieve stopping without causing the electric tool to vibrate violently or make loud noise during use.

Description

Technical Field

[0001] The present invention relates to the field of electric tools, and in particular to a stopping structure for electric tools. Background Art

[0002] Power tools have been widely used in our work and life. During use, the executive end of the power tool will be disassembled and installed due to wear and tear of the executive end and switching between different executive ends.

[0003] During the disassembly and installation process, it is found that many power tools are mainly used for rotation processing, and the execution end is mainly fixed with threaded connection to facilitate disassembly and installation. However, it is necessary to ensure the relationship between the rotation direction and the threaded connection direction to ensure that the threaded connection strength can be strengthened during the rotation execution process to avoid the threaded connection being released during the rotation execution process.

[0004] After using the power tool for a long time, the initial locking of the threaded connection and the enhanced locking process during the rotation execution process will cause the firmness of the execution end connection and make it difficult to disassemble; at the same time, the disassembly work of the threaded connection is reverse rotation. During the disassembly process, the connecting shaft of the power tool needs to be fixed before the execution end is rotated to complete the disassembly work of the execution end. Otherwise, the execution end will rotate in the opposite direction with the connecting shaft, making it difficult to disassemble.

[0005] During the disassembly process, there are mainly two disassembly methods. One is to add a clamping part to the connecting shaft. When disassembly is required, the clamping part on the connecting shaft is clamped with a clamping tool to prevent the connecting shaft from rotating, and then the execution end is disassembled. However, this process requires extending the length of the connecting shaft, resulting in a decrease in the anti-torque deformation ability of the connecting shaft, and the clamping part will also be damaged during multiple clamping processes, resulting in poor stability of the clamping part of the connecting shaft, and ultimately resulting in a short service life of the connecting shaft; the other is to adopt a stop shaft structure, design a stop groove on the connecting shaft, insert the stop shaft into the stop groove, complete the rotation limit of the connecting shaft, and then disassemble the execution end. However, due to the unilateral force of the stop shaft in this process, the connection will be offset or deformed. When the offset or deformation exceeds a certain amplitude, the power tool will vibrate violently and make loud noises during rotation. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a stopping structure for an electric tool which adopts a matching structure of a stopping shaft and a stopping groove to achieve stopping without causing severe vibration and loud noise during use of the electric tool.

[0007] The technical solution adopted by the present invention to solve the above-mentioned problem is: a power tool stopping structure, comprising a housing, a drive motor and a connecting shaft are provided in the axial direction of the housing, the drive motor is used to drive the connecting shaft to rotate, an adjusting coupling is provided between the drive motor and the connecting shaft, the adjusting coupling is used to ensure that the connecting shaft can rotate stably even when eccentricity occurs with the drive motor, the adjusting coupling comprises a first connecting body connected to the connecting shaft in a circumferential limit manner and a second connecting body connected to the output end of the motor in a circumferential limit manner, the first connecting body and the second connecting body are connected by a spline transmission with a clearance fit, bearings are provided at both ends of the connecting shaft to ensure the rotation of the connecting shaft, a stop groove is provided between the two bearings of the connecting shaft, a stop switch is provided on the housing to cooperate with the stop groove, the stop switch comprises a stop shaft and a stop button, when the stop shaft is embedded in the stop groove, the rotation of the connecting shaft is limited, one end of the stop shaft is provided inside the housing to cooperate with the stop groove, and the other end of the stop shaft is provided outside the housing to connect to the stop button.

[0008] Compared with the prior art, the advantages of the present invention are: during the use of the stop structure, the stop shaft is driven to move in the direction of the stop groove by pressing the stop button. When the stop shaft is embedded in the stop groove, the stop shaft limits the rotation of the connecting shaft, and then the execution end of the power tool can be disassembled and installed. However, the direction of the connecting groove cannot always stay exactly below the stop shaft, which will cause the stop shaft to be unable to accurately embed into the stop groove during the pressing process. If the stop shaft is pressed without the stop groove, after multiple uses, the axis of the connecting shaft will be eccentric or deformed, thereby causing the power tool to be used excessively. The process of vibrating violently and making loud noises can be eliminated by adjusting the design of the coupling. The spline connection with the clearance fit between the first connector and the second connector can ensure the synchronous rotation between the first connector and the second connector, and the clearance fit of the spline connection can provide adjustment space between the spline connections. The clearance fit gap size is the low-vibration eccentric rotation range of the connecting shaft. Similarly, the gap is also limited. Excessive gap can easily cause transmission interference and tooth biting during the transmission process of the spline connection, thereby causing damage to the spline connection.

[0009] As an improvement of the present invention, a spline groove is provided on the axis of the first connecting body, and a spline that is clearance-matched with the spline groove is provided at the end of the second connecting body. The spline groove is provided with an embedded hole at one end close to the second connecting body, and the second connecting body is provided with an embedded shaft that is clearance-matched with the embedded hole. Through the improvement, because the spline transmission connection adopts a clearance fit, during the rotation of the connecting shaft, the spline and the spline groove will always be separated and abutted alternately, which can easily cause abutment wear between the spline and the spline groove, especially in the case of rotation with the maximum eccentric distance, the abutment wear is most severe, and the clearance fit between the embedded hole and the embedded shaft can make the embedded shaft abut along the inner surface of the embedded hole when the connecting shaft 3 rotates with the maximum eccentric distance, thereby reducing the abutment force between the spline and the spline groove, and then reducing the abutment wear between the spline and the spline groove, effectively ensuring the service life of the adjustment coupling.

[0010] As an improvement of the present invention, the outer side of the first connector is further provided with a plurality of balancing blades uniformly arrayed along the circumference of the first connector, and the plurality of balancing blades are arranged on the outer side of the embedded hole. Through the improvement, when the connecting shaft rotates eccentrically, the connecting shaft always rotates as a driven shaft, and the output end of the drive motor is the active shaft. The spline transmission connection with clearance fit can easily cause the connecting shaft to be pulled by the output end of the drive motor, that is, the stability of the connecting shaft during rotation can only be supported by two bearings, but the two bearings are static supports and the stabilization effect is general. The design of multiple balancing blades can increase the rotational torque of the first connector when it rotates, and achieve the purpose of dynamic balance. After the first connector rotates, its balancing effect is better, and the design of balancing blades does not increase too much rotational load of the first connector. Compared with the design of directly thickening the first connector, the structure is lighter and starts faster.

[0011] As an improvement of the present invention, the stop button is polygonal, and a limiting hole that fits with the stop button is provided on the shell. The limiting hole is used to prevent the stop button from rotating. The stop button is threadedly connected to the stop shaft, and a reset spring is provided in the limiting hole. The reset spring is arranged between the stop button and the shell. Through the improvement, because the stop button is polygonal, after the stop button is embedded in the limiting hole, the stop button will not be able to rotate, and the stop button is threadedly connected to the stop shaft. When the stop button cannot rotate, the reset spring can be effectively locked between the stop button and the shell to prevent the reset spring and the stop button from detaching from the stop shaft.

[0012] As an improvement of the present invention, a limiting flange is provided on the stop shaft, and the limiting flange is arranged inside the shell. The limiting flange is used to abut against the inner wall of the shell to limit the outward movement of the stop shaft. Through the improvement, because the reset spring is arranged between the stop button and the shell, it is necessary to prevent the stop shaft from detaching from the shell, so it is necessary to design a limiting flange on the stop shaft, and the limiting flange is arranged inside the shell. At the same time, this structure can also make the stop button always embedded in the limiting hole, so that the stop button cannot be rotated and cannot be detached from the threaded connection with the stop shaft. The threaded connection between the stop button and the stop shaft can only be achieved by rotating the stop shaft.

[0013] As an improvement of the present invention, the shell is formed by splicing multiple connecting shells, and the limiting hole is provided on one of the connecting shells. The installation of the stop button and the stop shaft is completed first, and then the shell is spliced. Through the improvement, because the rotatable part of the stop shaft is provided in the shell during the installation process, in order to facilitate the installation of the stop shaft and the bearing, the shell is designed to be split. After the splicing and installation of the shell is completed, the stop shaft is also difficult to be accidentally rotated by external interference, thereby avoiding the connection between the stop button and the stop shaft from being disconnected, and ensuring the stability of the connection of the stop button.

[0014] As an improvement of the present invention, the axis of the stop shaft is perpendicular to the axis of the connecting shaft, a first positioning column is provided at the bottom of the limiting hole, the axis of the first positioning column coincides with the axis of the stop shaft, and a second positioning column is provided at one end of the stop button close to the limiting hole, the axis of the second positioning column coincides with the axis of the stop shaft, when one end of the reset spring is sleeved on the first positioning column, the other end of the reset spring is sleeved on the second positioning column. Through the improvement, during the disassembly of the execution end of the power tool, the connection between the stop shaft and the stop groove will be subjected to a tangential force of the connecting shaft, which may It will cause the stop shaft to deflect, so it is necessary to strengthen the mobile connection of the stop shaft through the design of the first positioning column to avoid deformation of the shell and ensure the moving direction of the stop shaft. At the same time, if deflection occurs, the reset spring will also undergo some deflection and deformation accordingly. The design of the first positioning column and the second positioning column can make the reset spring synchronously reset with the stop shaft when resetting. Otherwise, if the stop shaft remains deflected, the stop shaft may not be able to be embedded in the stop groove or the stop shaft may be embedded in the stop groove at a deflected angle when the stop operation is performed next time, causing damage to the stop groove or the stop shaft.

[0015] As an improvement of the present invention, the diameter of one end of the stop shaft that cooperates with the connecting shaft is smaller than the diameter of the connecting shaft, and the limiting flange is provided with a reinforcing cone at one end close to the connecting shaft, and the diameter of the reinforcing cone decreases from the limiting flange toward the connecting shaft. The diameter of one end of the reinforcing cone is the same as the diameter of the stop shaft, and when the stop shaft and the connecting shaft are engaged, one end of the reinforcing cone is located at the stop connection between the stop shaft and the connecting shaft. Through the improvement, because the design size of the stop groove cannot be too large, otherwise it will easily affect the overall strength of the connecting shaft. Therefore, the diameter of one end of the stop shaft that cooperates with the connecting shaft is smaller than the diameter of the connecting shaft. When the stop shaft is stopped, it is necessary not only to prevent the stop shaft from deflecting, but also to prevent the stop shaft from deforming. Through the design of the reinforcing cone, the tangential force of one end of the stop shaft that cooperates with the connecting shaft can be shared on the limiting flange. If there is no reinforcing cone design, after long-term use, the stop shaft in the engaged state with the stop groove will be deformed at the stop connection between the stop shaft and the connecting shaft, especially at the notch position of the stop groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0017] Figure 2 It is a schematic diagram of the cross-sectional structure of the overall structure of the present invention.

[0018] Figure 3 It is a schematic diagram of the cross-sectional structure of the adjustable coupling connection of the present invention.

[0019] Figure 4 It is a perspective structural diagram of the connection between the first connector and the second connector of the present invention.

[0020] Figure 5 It is a perspective structural diagram of the connection between the first connector and the connecting shaft of the present invention.

[0021] Figure 6 Schematic diagram of the second connector structure of the present invention.

[0022] Figure 7 It is a schematic structural diagram of the stop switch of the present invention in a normal state.

[0023] Figure 8 It is a structural schematic diagram of the stop switch of the present invention in the stop state.

[0024] Shown in the figure: 1. Housing, 1.1. Limiting hole, 1.2. First positioning column, 2. Drive motor, 3. Connecting shaft, 3.1. Stop groove, 4. Adjusting coupling, 4.1.1. Spline groove, 4.1.2. Embedded hole, 4.1.3. Balancing blade, 4.2. Second connecting body, 4.2.1. Spline, 4.2.2. Embedded shaft, 5. Bearing, 6. Stop switch, 6.1. Stop shaft, 6.1.1. Limiting flange, 6.1.2. Strengthening cone, 6.2. Stop button, 6.2.1. Second positioning column, 7. Return spring. DETAILED DESCRIPTION

[0025] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0026] like Figure 1-2 As shown, a power tool stopping structure includes a housing 1, wherein a drive motor 2 and a connecting shaft 3 are provided in the axial direction of the housing 1, wherein the drive motor 2 is used to drive the connecting shaft 3 to rotate, and an adjusting coupling 4 is provided between the drive motor 2 and the connecting shaft 3, wherein the adjusting coupling 4 is used to ensure that the connecting shaft 3 can rotate stably even when eccentric with the drive motor 2, and the adjusting coupling 4 includes a first connecting body 4.1 connected to the connecting shaft 3 in a circumferential limit manner and a second connecting body 4.2 connected to the output end of the motor in a circumferential limit manner, wherein the first connecting body 4.1 and the second connecting body 4.2 are connected by a clearance fit The spline 4.2.1 is used for transmission connection. Bearings 5 are provided at both ends of the connecting shaft 3 to ensure the rotation of the connecting shaft 3. A stop groove 3.1 is provided on the connecting shaft 3 between the two bearings 5. A stop switch 6 is provided on the housing 1 to cooperate with the stop groove 3.1. The stop switch 6 includes a stop shaft 6.1 and a stop button 6.2. When the stop shaft 6.1 is embedded in the stop groove 3.1, the connecting shaft 3 is limited in rotation. One end of the stop shaft 6.1 is provided inside the housing 1 for cooperating with the stop groove 3.1, and the other end of the stop shaft 6.1 is provided outside the housing 1 for connecting to the stop button 6.2.

[0027] like Figure 3-6As shown, a spline groove 4.1.1 is provided on the axis of the first connector 4.1, a spline 4.2.1 is provided at the end of the second connector 4.2, which is clearance-fitted with the spline groove 4.1.1, an embedded hole 4.1.2 is provided at one end of the spline groove 4.1.1 close to the second connector 4.2, and an embedded shaft 4.2.2 is provided on the second connector 4.2, which is clearance-fitted with the embedded hole 4.1.2. The outer side of the first connector 4.1 is also provided with a plurality of balancing blades 4.1.3 uniformly arrayed along the circumference of the first connector 4.1, and the plurality of balancing blades 4.1.3 are arranged on the outer side of the embedded hole 4.1.2. At the same time, a circumferential limit block is provided in the first connector 4.1, and a circumferential limit surface is provided on the connecting end of the connecting shaft 3 and the first connector 4.1. The circumferential limit block on the first connector 4.1 is connected to the circumferential limit surface on the connecting shaft 3 in a circumferential limit manner. Two circumferential limit blocks are provided on the first connector 4.1, and two circumferential limit surfaces are provided on the connecting shaft 3. A circumferential limit block is also provided in the second connector 4.2, and a circumferential limit surface is provided on the output end of the drive motor 2. The circumferential limit block on the second connector 4.2 is connected to the circumferential limit surface on the output end of the drive motor 2 in a circumferential limit manner.

[0028] like Figure 1 、 Figure 7 、 Figure 8 As shown, the stop button 6.2 is polygonal, and a limiting hole 1.1 is provided on the shell 1, which fits with the stop button 6.2. The limiting hole 1.1 is used to prevent the stop button 6.2 from rotating. The stop button 6.2 is threadedly connected to the stop shaft 6.1. A reset spring 7 is provided in the limiting hole 1.1, and the reset spring 7 is provided between the stop button 6.2 and the shell 1. A limiting flange 6.1.1 is provided on the stop shaft 6.1, and the limiting flange 6.1.1 is provided inside the shell 1. The limiting flange 6.1.1 is used to abut against the inner wall of the shell 1 to limit the stop shaft 6.1 from moving outward. The shell 1 is made of multiple connecting shells, and the limiting hole 1.1 is provided on one of the connecting shells. After completing the installation of the stop button 6.2 and the stop shaft 6.1, the shell 1 is spliced.

[0029] The axis of the stop shaft 6.1 is perpendicular to the axis of the connecting shaft 3. A first positioning column 1.2 is provided at the bottom of the limiting hole 1.1. The axis of the first positioning column 1.2 coincides with the axis of the stop shaft 6.1. A second positioning column 6.2.1 is provided at one end of the stop button 6.2 close to the limiting hole 1.1. The axis of the second positioning column 6.2.1 coincides with the axis of the stop shaft 6.1. When one end of the reset spring 7 is sleeved on the first positioning column 1.2, the other end of the reset spring 7 is sleeved on the second positioning column 6.2.1. The diameter of one end of the stop shaft 6.1 that cooperates with the connecting shaft 3 is smaller than the diameter of the connecting shaft 3. A reinforcing cone 6.1.2 is provided at the end of the limit flange 6.1.1 close to the connecting shaft 3. The diameter of the reinforcing cone 6.1.2 decreases from the limit flange 6.1.1 toward the connecting shaft 3. The diameter of the end with the smallest diameter of the reinforcing cone 6.1.2 is the same as the diameter of the stop shaft 6.1. When the stop shaft 6.1 and the connecting shaft 3 are in a stop fit, the end with the smallest diameter of the reinforcing cone 6.1.2 is located at the stop connection between the stop shaft 6.1 and the connecting shaft 3.

[0030] The present invention adjusts the design of the coupling 4 so that the rotational stability of the connecting shaft 3 no longer depends on the coaxiality of the connecting shaft 3 and the driving end of the drive motor 2, so that when the connecting shaft 3 and the driving end of the drive motor 2 rotate eccentrically, they can also have good stability, low vibration and low noise. At the same time, because the housing 1 is a split design, and the axis of the connecting shaft 3 is mainly fixed by the bearing 5, but the housing 1 is an injection molded product, the hardness of the housing 1 is not high. It is easy to deform when subjected to long-term unilateral pressure, which will also accelerate the eccentricity of the axis of the connecting shaft 3. In addition, it will be affected by temperature and experience thermal expansion and contraction. Under thermal expansion, the diameter of the bearing groove becomes larger, which will also cause the connecting shaft 3 to move eccentrically when pressed. Therefore, there are many interference factors that cause the eccentric rotation of the connecting shaft 3. After long-term use, eccentric rotation is inevitable. Adjusting the coupling 4 can solve the problems of severe vibration and loud noise caused by these systematic eccentric rotations. At the same time, in order to ensure the stability of the installation of the bearing 5, the design of the bearing groove on the housing 1 is often a transition fit with the bearing 5, or even an interference fit. Under this fit, the bearing groove and the bearing 5 cannot be disassembled frequently, otherwise the fit accuracy between the two will be damaged, thereby causing a significant decrease in the rotational stability of the connecting shaft 3. Therefore, it is necessary to ensure the firmness and stability of the connection of all tools on the power tool. Through the design of the stop switch 6, the stop shaft 6.1 is installed from the inside of the housing 1, and the stop button 6.2 cannot be separated from the housing 1 after the installation is completed with the stop shaft 6.1, which fully ensures the firmness of the connection of the stop switch 6. The design of the reinforcing cone 6.1.2 can fully ensure the strength of the stop shaft 6.1, greatly improving the difficulty of the stop shaft 6.1 being deformed during the stopping process, thereby reducing the maintenance cycle of the stop shaft 6.1. Through the design of the present invention, the long service life of the power tool can be fully demonstrated. Some reasons for the short service life of the power tool can be solved by the design of the present invention so that the power tool can self-regulate without the need for maintenance, thereby ensuring the low vibration and low noise characteristics of the power tool.

[0031] The above description is merely a description of the preferred embodiment of the present invention and is not to be construed as limiting the scope of the claims. The present invention is not limited to the above embodiment, and variations in the specific structure are permitted. Any variations within the scope of the independent claims of the present invention are also within the scope of protection of the present invention.

Claims

1. A stopping structure for an electric tool, characterized in that: The invention comprises a housing (1), wherein a driving motor (2) and a connecting shaft (3) are provided in the axial direction of the housing (1), wherein the driving motor (2) is used to drive the connecting shaft (3) to rotate, and an adjusting coupling (4) is provided between the driving motor (2) and the connecting shaft (3), wherein the adjusting coupling (4) is used to ensure that the connecting shaft (3) can rotate stably even when eccentricity occurs with the driving motor (2), and wherein the adjusting coupling (4) comprises a first connecting body (4.1) connected to the connecting shaft (3) in a circumferentially limited manner and a second connecting body (4.2) connected to the output end of the motor in a circumferentially limited manner, wherein the first connecting body (4.1) and the second connecting body (4.2) are connected to each other through a spline (4.2.1) with clearance fit, and the connecting shaft (3) is provided with a retaining member at both ends. The connecting shaft (3) is provided with a bearing (5) for rotating, and a stop groove (3.1) is provided between the two bearings (5). The housing (1) is provided with a stop switch (6) that matches the stop groove (3.1). The stop switch (6) includes a stop shaft (6.1) and a stop button (6.2). When the stop shaft (6.1) is embedded in the stop groove (3.1), the connecting shaft (3) is limited in rotation. One end of the stop shaft (6.1) is provided inside the housing (1) for matching with the stop groove (3.1), and the other end of the stop shaft (6.1) is provided outside the housing (1) for connecting to the stop button (6.2). The stop button (6.2) is polygonal, and the housing (1) is provided with a stop button (6.2) that matches with the stop button (6.2). The limiting hole (1.1) is used to prevent the stop button (6.2) from rotating. The stop button (6.2) is threadedly connected to the stop shaft (6.1). A reset spring (7) is provided in the limiting hole (1.1). The reset spring (7) is provided between the stop button (6.2) and the housing (1). A limiting flange (6.1.1) is provided on the stop shaft (6.1). The limiting flange (6.1.1) is provided inside the housing (1). The limiting flange (6.1.1) is used to abut against the inner wall of the housing (1) to limit the outward movement of the stop shaft (6.1). The axis of the stop shaft (6.1) is perpendicular to the axis of the connecting shaft (3). The bottom of the limiting hole (1.1) is provided with a first stopper. A positioning column (1.2), the axis of the first positioning column (1.2) coincides with the axis of the stop shaft (6.1), the stop button (6.2) is provided with a second positioning column (6.2.1) at one end close to the limiting hole (1.1), the axis of the second positioning column (6.2.1) coincides with the axis of the stop shaft (6.1), when one end of the return spring (7) is sleeved on the first positioning column (1.2), the other end of the return spring (7) is sleeved on the second positioning column (6.2.1), the diameter of the end of the stop shaft (6.1) that cooperates with the connecting shaft (3) is smaller than the diameter of the connecting shaft (3), the limiting flange (6.1.1) is provided with a strengthening cone (6.1.2) at one end close to the connecting shaft (3), the strengthening cone (6.The diameter of the reinforcing cone (6.1.2) decreases from the limit flange (6.1.1) toward the connecting shaft (3), the diameter of one end of the reinforcing cone (6.1.2) is the same as the diameter of the stop shaft (6.1), and when the stop shaft (6.1) and the connecting shaft (3) are engaged in a stop fit, one end of the reinforcing cone (6.1.2) is located at the stop connection between the stop shaft (6.1) and the connecting shaft (3).

2. The electric tool stopping structure according to claim 1, characterized in that: A spline groove ( 4.1.1), the end of the second connector (4.2) is provided with a spline (4.2.1) that is clearance-matched with the spline groove (4.1.1), and the end of the spline groove (4.1.1) close to the second connector (4.2) is provided with an embedded hole ( 4.1.2), the second connector (4.2) is provided with an embedded shaft (4.2.2) that is clearance-matched with the embedded hole (4.1.2).

3. The electric tool stopping structure according to claim 2, characterized in that: The outer side of the first connector (4.1) is further provided with a plurality of balancing blades (4.1.3) arranged in a uniform array along the circumference of the first connector (4.1), and the plurality of balancing blades (4.1.3) are arranged on the outer side of the embedding hole (4.1.2).

4. The electric tool stopping structure according to claim 1, characterized in that: The housing (1) is formed by splicing together a plurality of connecting shells, and the limiting hole (1.1) is provided on one of the connecting shells. The stop button (6.2) and the stop shaft (6.1) are installed first, and then the housing (1) is spliced together.

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