An electric impact tool
By improving the split-type housing structure and internal component design of the electric impact tool, the problem of internal component displacement during vibration was solved, the stability and transmission accuracy of the armature assembly were achieved, and the rigidity and service life of the equipment were improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- WENLING JUFENG MACHINERY CO LTD
- Filing Date
- 2025-08-22
- Publication Date
- 2026-07-21
AI Technical Summary
Existing electric impact tools lack stable mounting references for their internal components, making them prone to displacement during vibration, which affects impact accuracy and efficiency.
It adopts a split housing structure, which combines the upper armature frame, lower armature frame and armature fixing frame to form a three-dimensional fixed space. With bearing chamber and rotor bearing design, the stability of the armature assembly is enhanced, and the rigidity of the housing is improved by strengthening the shaft and mounting plate design.
To ensure the armature assembly maintains axial stability during high-speed rotation and prevents positional deviation, the brush assembly maintains stable contact with the armature body, improving overall rigidity and resistance to deformation, and enhancing transmission accuracy and equipment lifespan.
Smart Images
Figure CN224526047U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of power tool technology and relates to an electric impact tool. Background Technology
[0002] The electric impact mechanism is a common type of power tool. It uses an electric motor as its core power source and can be equipped with a drill chuck to install various drill bits. It is widely used in construction and decoration, and machinery manufacturing.
[0003] Chinese patent publication number CN219094979U discloses an electric impact tool, including a housing, a reduction transmission, and an impact working part. The reduction transmission includes an internal gear ring and a motor gear, a first-stage planetary gear, a second-stage planetary gear, and a connecting gear that are meshed within the internal gear ring. The impact working part includes a camshaft, an impact block, a working shaft, and an impact spring. The camshaft is connected between the reduction transmission and the working shaft. The housing is composed of a head housing and a gearbox that are interconnected and internally connected. The head housing is used to house the impact working part, and the gearbox is used to house the reduction transmission.
[0004] The patent provides an electric impact tool in which the housing does not have a structure for connecting with the internal components. When in use, the internal components of the electric impact tool lack a stable mounting reference and are prone to displacement during vibration, affecting the impact accuracy and efficiency. Utility Model Content
[0005] The purpose of this invention is to address the aforementioned problems in the existing technology by providing an electric impact tool.
[0006] The objective of this utility model can be achieved through the following technical solution: An electric impact tool includes a housing, a battery pack, a commutator, an armature assembly, a brush assembly, a gear set, and a drill chuck. The housing consists of two parts, fixedly connected left and right. An upper armature frame and a lower armature frame are formed inside each housing. An armature fixing frame is formed inside the housing between the upper and lower armature frames. The armature assembly includes an armature body, windings, and a rotor bearing. The armature assembly is fixedly installed between the upper and lower armature frames and connected to the armature fixing frame. Next, a fixing pin is installed on the rear side of the armature assembly, and the other end of the fixing pin is fixedly connected to the commutator. The armature body passes through the commutator and is connected to the commutator. The rotor bearing is connected to the end of the armature body. A bearing chamber is formed inside the housing, and the rotor bearing is installed in the bearing chamber. The brush assembly is connected to the other end of the armature body. The brush assembly includes a brush body and a brush holder. A mounting plate is formed inside the housing, and a mounting groove is opened in the mounting plate. The brush holder extends into the mounting groove and is connected to the mounting plate.
[0007] In the aforementioned electric impact tool, a switch chamber is formed inside the housing, and a speed control switch is installed in the switch chamber. The speed control switch extends upward and is connected to a commutator.
[0008] In the aforementioned electric impact tool, a battery chamber is formed inside the housing, and the battery pack is fixedly installed in the battery chamber. A switch slot is provided on the outer periphery of the housing on one side of the battery chamber, and a power switch is installed in the switch slot. The power switch is connected to the battery pack.
[0009] In the aforementioned electric impact tool, a plurality of heat sinks are formed inside the upper end of the housing, and a number of heat sink grooves corresponding to the number of heat sinks are formed on the surface of the housing above the heat sinks.
[0010] In the aforementioned electric impact tool, the gear set is connected to the brush assembly, the drill chuck is connected to the gear set, and the drill chuck is located outside the housing.
[0011] In the aforementioned electric impact tool, a plurality of reinforcing shafts are formed inside the housing, and one side of the reinforcing shaft is fixedly connected to the other side of the reinforcing shaft.
[0012] Compared with the prior art, the electric impact tool provided by this utility model has the following beneficial effects: 1. The internal housing provides a three-dimensional fixed space for the armature assembly through the integrally formed upper armature frame, lower armature frame and armature fixing frame, so that the armature body, winding and rotor bearing always maintain axial stability when rotating at high speed, avoiding positional displacement caused by vibration. Moreover, the matching design of the bearing chamber and the rotor bearing further restricts the radial sway of the armature assembly, ensuring that its transmission contact with the commutator and brush assembly is accurate and continuous; 2. The matching design of the mounting groove on the mounting plate and the brush frame allows the brush assembly to be accurately embedded and maintain stable contact with the armature body, preventing the brush from detaching from the commutator due to vibration; 3. The housing adopts a split structure with the left and right parts fixedly connected, and with the mutual fixation of several internal reinforcing shafts, the overall rigidity and deformation resistance of the housing are greatly improved. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the internal structure of this utility model; Figure 3 This is a schematic diagram of the casing structure.
[0014] In the diagram: 1. Housing; 11. Upper armature frame; 12. Lower armature frame; 13. Armature mounting frame; 14. Bearing housing; 15. Mounting plate; 151. Mounting slot; 16. Switch chamber; 17. Battery chamber; 18. Switch slot; 19. Heat sink; 191. Heat dissipation slot; 10. Reinforcing shaft; 2. Battery pack; 3. Commutator; 4. Armature assembly; 41. Armature body; 42. Winding; 43. Rotor bearing; 44. Fixing pin; 5. Brush assembly; 51. Brush body; 52. Brush holder; 6. Gear set; 7. Drill chuck; 8. Speed control switch; 9. Power switch. Detailed Implementation
[0015] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.
[0016] like Figures 1 to 3 As shown, this embodiment includes a housing 1, a battery pack 2, a commutator 3, an armature assembly 4, a brush assembly 5, a gear set 6, and a drill chuck 7. The housing 1 is configured as two parts, left and right, which are fixedly connected by bolts. The overall structure is stable and facilitates the installation and maintenance of the internal components. The housing 1 has an upper armature frame 11 and a lower armature frame 12 integrally formed inside. An armature fixing frame 13 is formed inside the housing 1 between the upper armature frame 11 and the lower armature frame 12, providing a reliable installation base for the armature assembly 4.
[0017] like Figures 1 to 3 As shown, the armature assembly 4 includes an armature body 41, a winding 42, and a rotor bearing 43. The armature assembly 4 is fixedly installed between the upper armature frame 11 and the lower armature frame 12 by bolts and is tightly connected to the armature fixing frame 13 to ensure stability during operation. A fixing pin 44 is installed on the rear side of the armature assembly 4, and the other end of the fixing pin 44 is fixedly connected to the commutator 3. The armature body 41 passes through the commutator 3 and is connected to the commutator 3 for transmission to realize the current commutation function. The rotor bearing 43 is interference-fitted with the end of the armature body 41. A bearing chamber 14 is formed at the corresponding position inside the housing 1. The rotor bearing 43 is installed in the bearing chamber 14 to effectively reduce the frictional resistance when the armature body 41 rotates.
[0018] like Figures 2 to 3 As shown, the brush assembly 5 is connected to the other end of the armature body 41. The brush assembly 5 includes a brush body 51 and a brush holder 52. A mounting plate 15 is formed inside the housing 1. A mounting groove 151 is provided in the mounting plate 15. The brush holder 52 extends into the mounting groove 151 and is fixedly connected to the mounting plate 15 by a buckle. The assembly is convenient and the connection is firm. The gear set 6 is connected to the brush assembly 5 for transmission. The drill chuck 7 is fixedly connected to the output end of the gear set 6. The drill chuck 7 is located outside the housing 1 and is used to clamp working accessories of different specifications.
[0019] To elaborate further, such as Figures 1 to 2 As shown, a switch chamber 16 is formed inside the housing 1. A speed control switch 8 is installed in the switch chamber 16. The speed control switch 8 extends upward and is electrically connected to the commutator 3. The running speed of the impact mechanism can be controlled by adjusting the speed control switch 8. A battery chamber 17 is also formed inside the housing 1. The battery pack 2 is fixedly installed in the battery chamber 17 through a slot for easy battery replacement. A switch slot 18 is opened on the outer periphery of the housing 1 on one side of the battery chamber 17. A power switch 9 is installed in the switch slot 18. The power switch 9 is electrically connected to the battery pack 2 and is used to control the power supply of the entire mechanism.
[0020] To elaborate further, such as Figures 1 to 3 As shown, a number of heat sinks 19 are integrally formed inside the upper end of the housing 1. The heat sinks 19 are arranged in an array to enhance the heat dissipation effect. The surface of the housing 1 above the heat sinks 19 has a number of heat dissipation grooves 191 corresponding to the heat sinks 19. The heat dissipation grooves 191 are connected to the outside, which can quickly dissipate the heat inside the housing 1 to the outside, and prevent the components from being damaged due to overheating.
[0021] To further explain, such as Figures 1 to 2 As shown, several reinforcing shafts 10 are also formed inside the housing 1. One side of the reinforcing shaft 10 is fixedly connected to the other side of the reinforcing shaft 10 to form a stable support structure, which effectively improves the overall rigidity and impact resistance of the housing 1.
[0022] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.
[0023] Although this document uses a variety of terms, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this invention; interpreting them as any additional limitation would contradict the spirit of this invention.
Claims
1. An electric impact tool, comprising a housing (1), a battery pack (2), a commutator (3), an armature assembly (4), a brush assembly (5), a gear set (6), and a drill chuck (7), characterized in that: The housing (1) consists of two parts, which are fixedly connected to each other. An upper armature frame (11) and a lower armature frame (12) are formed inside the housing (1). An armature fixing frame (13) is formed inside the housing (1) between the upper armature frame (11) and the lower armature frame (12). The armature assembly (4) includes an armature body (41), windings (42), and a rotor bearing (43). The armature assembly (4) is fixedly installed between the upper armature frame (11) and the lower armature frame (12) and connected to the armature fixing frame (13). A fixing pin (44) is installed on the rear side of the armature assembly (4), and the other end of the fixing pin (44) is fixedly connected to the commutator (3). The armature body (41) passes through the commutator (3) and is connected to the commutator (3). The rotor bearing (43) is connected to the end of the armature body (41). A bearing chamber (14) is formed inside the housing (1). The rotor bearing (43) is installed in the bearing chamber (14). The brush assembly (5) is connected to the other end of the armature body (41). The brush assembly (5) includes a brush body (51) and a brush holder (52). A mounting plate (15) is formed inside the housing (1). A mounting groove (151) is provided in the mounting plate (15). The brush holder (52) extends into the mounting groove (151) and is connected to the mounting plate (15).
2. The electric impact tool according to claim 1, characterized in that: The housing (1) has a switch chamber (16) inside, and a speed control switch (8) is installed in the switch chamber (16). The speed control switch (8) extends upward and is connected to the commutator (3).
3. The electric impact tool according to claim 1, characterized in that: The housing (1) has a battery chamber (17) inside, and the battery pack (2) is fixedly installed in the battery chamber (17). A switch slot (18) is provided on the outer periphery of the housing (1) on one side of the battery chamber (17). A power switch is installed in the switch slot (18) and the power switch is connected to the battery pack (2).
4. The electric impact tool according to claim 1, characterized in that: The upper end of the housing (1) has a plurality of heat sinks (19) formed inside, and the surface of the housing (1) above the heat sinks (19) has a number of heat sink grooves (191) corresponding to the number of heat sinks (19).
5. An electric impact tool according to claim 1, characterized in that: The gear set (6) is connected to the brush assembly (5), and the drill chuck (7) is connected to the gear set (6). The drill chuck (7) is located outside the housing (1).
6. An electric impact tool according to claim 1, characterized in that: The housing (1) has several reinforcing shafts (10) inside, and one side of the reinforcing shaft (10) is fixedly connected to the other side of the reinforcing shaft (10).