Electric power tool with openable and closable impact mode and low wear

Abstract

The application provides an openable and closable impact mode and low wear electric tool, which comprises a gear box shell, a motor mounting shell, an intermediate connecting cover and a handle shell, an impact structure is arranged between the gear box shell and the intermediate connecting cover, the impact structure comprises an output shaft and a driven assembly, the output shaft is sleeved with an actuating assembly and an impact adjusting assembly, the driven assembly is in meshing connection with the actuating assembly, a driving assembly is arranged between the motor mounting shell and the intermediate connecting cover, a sealed cavity for filling liquid oil is formed between the gear box shell and the intermediate connecting cover through an oil seal, an oil injection assembly which penetrates into the sealed cavity is arranged on the gear box shell, the driving assembly is in meshing connection with the driven assembly, and a control assembly is arranged in the handle shell. The application can realize real-time oiling of the actuating assembly and the driven assembly, prevent working wear of spare parts, flexibly switch the open and closed impact tool mode, and improve the use convenience of the tool.

Description

Technical Field

[0001] This invention relates to the field of power tool technology, and more specifically to a power tool with an openable and closable impact mode and low wear. Background Technology

[0002] Power tools are handheld or portable mechanized tools that use a motor to drive a working head through a transmission mechanism. Compared to traditional hand tools, their advantages lie in saving effort and increasing efficiency. There are many types of power tools, and different tools can be selected depending on the usage scenario and function. Impact drills are currently the most widely used power tools. An impact drill is based on a regular electric drill, but with the addition of a drive mechanism. Through the combination of ball bearings, gears, and other structures, it can reciprocate to strike the drill bit, making it easy to drill holes in hard objects. The drive mechanism of an impact drill typically consists of two impact gears interacting to achieve high-frequency back-and-forth striking.

[0003] For example, patent CN210208779U discloses an impact drill, including a housing and an impact drill output shaft disposed within the housing and extending from the front end of the housing. The front end of the impact drill output shaft is provided with a drill chuck, and the rear end of the impact drill output shaft is fitted with a large gear. It also includes a first drive mechanism for driving the drill bit to rotate around the axis of the impact drill output shaft and a second drive mechanism for driving the drill bit to frequently impact along the axial direction of the impact drill output shaft. The first drive mechanism includes a motor disposed within the housing, the output shaft of which is a gear shaft meshing with a large gear. An oil slinger ring and an oil retainer ring are fitted on the rear part of the gear shaft near the front bearing of the motor. The front outer wall of the oil slinger ring has an annular flange, and the rear end has an annular embedded portion, which is embedded between the inner wall of the oil retainer ring and the outer wall of the gear shaft. During operation, the oil slinger ring rotates synchronously with the gear shaft, throwing grease to all sides, which is then blocked by the annular flange. The oil retainer ring and oil slinger ring effectively prevent lubricating grease from entering the front bearing of the motor, reducing bearing wear and increasing the service life of the impact drill.

[0004] However, when the rotatable impact gear rotates at high speed on the surface of another fixed impact gear, the grease on both impact gear surfaces will be squeezed out of the impact gear surface area due to the rotation of the impact gear. Over time, the grease on the impact gear surface will become less and less, and the impact gear surface will also wear due to lack of lubrication and accelerated wear. The wear of the impact gear surface will directly lead to a shorter impact path of the impact drill, thereby weakening the impact function of the impact drill and reducing the service life of the impact drill. Summary of the Invention

[0005] The purpose of this invention is to provide a power tool with an openable and closable impact mode and low wear, so as to solve the problems existing in the background art.

[0006] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

[0007] A power tool with an openable / closable impact mode and low wear includes a gearbox housing and a motor mounting housing. One end of the motor mounting housing is connected to the gearbox housing via an intermediate connecting cover, and the other end is connected to a handle housing. An impact structure is provided between the gearbox housing and the intermediate connecting cover. The impact structure includes an output shaft and a driven assembly. One end of the output shaft extends sequentially into and is connected to the gearbox housing and the intermediate connecting cover via bearings. The other end of the output shaft is located on the outside of the gearbox housing, and an impact adjustment assembly is sleeved on the outer end of the output shaft. An actuating assembly is provided between the output shaft and the inner wall of the gearbox housing. The driven assembly is located below the actuating assembly and passes through the space between the gearbox housing and the intermediate connecting cover. The driven component and the actuating component are meshed and connected. A drive component is provided between the motor mounting housing and the intermediate connecting cover. A sealed cavity for filling liquid oil is formed between the gearbox housing and the intermediate connecting cover through an oil seal. An oil injection component for entering the sealed cavity is provided on the gearbox housing. The drive component and the driven component are meshed and connected. A control component is provided inside the handle housing. The control component is wired to the drive component. The control component electrically controls the cooperative operation of the drive component, the driven component and the actuating component. The impact adjustment component controls the axial movement of the output shaft to realize the change of the open and closed impact modes. A gear shifting component for adjusting the working speed of the actuating component is also provided on the gearbox housing.

[0008] Preferably, the aforementioned actuating assembly includes a first cam, a second cam, a low-speed gear, a clutch cam, and a high-speed gear sequentially mounted on the output shaft. The first cam is mounted on the output shaft via a first spline sleeve, the second cam is fixedly connected to the gearbox housing, and the clutch cam is mounted on the output shaft via a second spline sleeve. The second cam engages with one end of the low-speed gear and forms a movable gap with the first cam. The second spline sleeve is provided with a raceway, and the clutch cam is elastically provided with steel balls that roll on the raceway at intervals. The low-speed gear and the high-speed gear mesh with the driven assembly. The clutch cam is adjusted to engage with the low-speed gear or the high-speed gear via a shifting assembly, and then operates in conjunction with an impact adjustment assembly.

[0009] Preferably, the low-speed gear and the high-speed gear described above are respectively meshed with the driven component, and the two ends of the clutch cam are symmetrically provided with connecting seats. The low-speed gear and the high-speed gear are each provided with a connecting groove with the same structure on the side facing the clutch cam, and the connecting seats and the connecting grooves are engaged and snapped together.

[0010] Preferably, the aforementioned impact adjustment assembly includes a first fixing ring, a second fixing ring, and a third fixing ring sequentially sleeved on the output shaft. The first fixing ring is connected to the gearbox housing. One end of the second fixing ring is sleeved inside the first fixing ring. The third fixing ring is elastically connected to the output shaft. A spring is provided between the third fixing ring and the second fixing ring. The side of the third fixing ring facing the second fixing ring is provided with slots at intervals. A corresponding locking block is provided on the second fixing ring. A knob is also sleeved on the outer wall of the third fixing ring.

[0011] Preferably, the inner ring of the second fixing ring is provided with a groove at intervals, and the output shaft is provided with a steel ball corresponding to the groove; the inner ring of the third fixing ring is provided with a groove at intervals, and the output shaft is provided with a steel ball connected by an elastic element corresponding to the groove.

[0012] Preferably, the driven component includes a gear shaft, one end of which is connected to the gearbox housing via a bearing, and the other end is connected to the intermediate connecting cover via a bearing. The low-speed gear and the high-speed gear are respectively meshed with the gear shaft. A gear is sleeved on the gear shaft. The drive component includes a stator assembly, a rotor assembly, and a drive shaft. The stator assembly and the rotor assembly are both disposed within a motor mounting housing. One end of the drive shaft is connected to the motor mounting housing via a bearing, and the other end is connected to the intermediate connecting cover via a bearing and meshes with the gear.

[0013] Preferably, the aforementioned gear shifting assembly includes a fixed rod, a first movable seat, a second movable seat, a rotating seat, and an adjusting seat. The two ends of the fixed rod are respectively connected to the gearbox housing and the intermediate connecting cover. The first and second movable seats are movably connected to the fixed rod. The two ends of the first movable seat are bent to form a first limiting piece and a first movable end. The two ends of the second movable seat are bent to form a second limiting piece and a second movable end. The second movable seat passes through the first movable seat, with the second movable piece located inside the first movable piece and forming a gap. The second movable end is located outside the first movable end. A spring is also sleeved on the fixed rod, located between the second movable end and the second movable piece. A limiting post is provided on one side of the rotating seat, and a sliding seat is provided on the other side. The limiting post is located within the gap formed by the first and second movable pieces. The sliding seat extends out of the gearbox housing and is connected to the adjusting seat by screws. The adjusting seat moves elastically along the sliding seat. A limiting groove for rotating the adjusting seat is provided on the gearbox housing.

[0014] Preferably, the aforementioned adjusting seat is provided with two rotating blocks, and two steel balls are connected to the rotating blocks by elastic elements. Two limiting grooves are provided accordingly, and a fixing groove for embedding the steel balls is provided in the limiting groove. The first moving seat is provided with a limiting hole, and the second moving seat is provided with a limiting block. The limiting block passes through and moves within the limiting hole.

[0015] Preferably, the motor mounting housing described above is also provided with a fan blade and a fan blade baffle, located between the drive assembly and the intermediate connecting cover. The control assembly includes a controller, a power switch button, a light panel assembly, and a power connection wire. The handle housing is also provided with a main handle, and the power switch button is located on the main handle. An auxiliary handle is also fitted on the outer side of the gearbox housing away from the intermediate connecting cover.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] (1) The power tool of the present invention has a compact structure. A liquid oil cavity is formed between the gearbox housing and the intermediate connecting cover by the first oil seal and the second oil seal. The actuating component and the driven component can be placed in the liquid oil cavity. In particular, the first cam and the second cam, which are used for impact work, play a real-time lubrication role, prevent the working wear of parts, thereby improving the connection sealing and working stability of the whole machine, and thus improving the service life of the power tool.

[0018] (2) The design of the impact adjustment component can adjust the axial movement of the output shaft. When the output shaft has a certain axial movement, the power tool can start the impact mode through the cooperation of the impact adjustment component and the actuation component. When the output shaft has no axial movement or very little axial movement, the output shaft can only rotate. That is, the power tool turns off the impact mode and performs the rotary drilling mode. This allows the power tool to flexibly turn the impact mode on and off, improving the tool's flexibility and multi-functionality. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention;

[0020] Figure 2 for Figure 1 A schematic diagram of the cross-sectional structure;

[0021] Figure 3 This is a schematic diagram of the internal structure of the present invention (1);

[0022] Figure 4 This is a schematic diagram of the internal structure of the present invention (2);

[0023] Figure 5 This is a schematic diagram showing the partial structure of the actuation component in this invention;

[0024] Figure 6 This is a schematic diagram showing the disassembled structure of the impact adjustment component in this invention;

[0025] Figure 7 This is a schematic diagram of the split structure at the location of the gear shift component in this invention;

[0026] In the attached image:

[0027] 1-Gearbox housing; 2-Motor mounting housing; 3-Intermediate connecting cover; 4-Handle housing; 5-First oil seal; 6-Second oil seal; 7-Output shaft; 8-Steel ball; 9-First cam; 10-Second cam; 11-Low-speed gear; 12-Clutch cam; 13-High-speed gear; 14-First spline sleeve; 15-Second spline sleeve; 16-Race track; 17-First retaining ring; 18-Second retaining ring; 19-Third retaining ring; 20-Slot; 21-Block; 22-Knob; 23-Slide groove; 24-Groove; 25-Gear 26-Gear; 27-Stator assembly; 28-Rotor assembly; 29-Drive shaft; 30-Fixing rod; 31-First moving seat; 32-Second moving seat; 33-Rotating seat; 34-Adjusting seat; 35-Limiting post; 36-Slide; 37-Limiting groove; 38-Rotating block; 39-Fixing groove; 40-Limiting hole; 41-Limiting block; 42-Fan blade; 43-Power switch button; 44-Main handle; 45-Auxiliary handle; 46-Spring; 47-Fan blade baffle; 48-Ball bearing; 49-Needle roller bearing. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Example

[0030] like Figure 1-7As shown, a power tool with an openable and closable impact mode and low wear includes a gearbox housing 1 and a motor mounting housing 2. One end of the motor mounting housing 2 is connected to the gearbox housing 1 via an intermediate connecting cover 3, and the other end is connected to a handle housing 4. An impact structure is provided between the gearbox housing 1 and the intermediate connecting cover 3. The impact structure includes an output shaft 7 and a driven component. One end of the output shaft 7 extends sequentially into the gearbox housing 1 and is connected to the intermediate connecting cover 3 via a rolling bearing 48 and a needle roller bearing 49. The other end of the output shaft 7 is located on the outside of the gearbox housing 1, and an impact adjustment component is sleeved on the output shaft 7 at the outer end. An actuating component is provided between the output shaft 7 and the inner wall of the gearbox housing 1. The driven component is located below the actuating component and passes through the gearbox housing 1 and the intermediate connecting cover 3, and the driven component meshes with the actuating component. A drive assembly is provided between the motor mounting housing 2 and the intermediate connecting cover 3. A sealed cavity for filling liquid oil is formed between the gearbox housing 1 and the intermediate connecting cover 3 through an oil seal (specifically, a first oil seal 5 is provided between the inner wall of the gearbox housing 1 and the output shaft 7, and a second oil seal 6 is provided between the inner wall of the intermediate connecting cover 3 and the drive assembly). An oil injection assembly is provided on the gearbox housing 1 to enter the sealed cavity. The drive assembly and the driven assembly are meshed together. A control assembly is provided inside the handle housing 4. The control assembly is wired to the drive assembly. The control assembly electrically controls the cooperation of the drive assembly, the driven assembly, and the actuating assembly. The impact adjustment assembly controls and adjusts the axial movement of the output shaft 7 to realize the change of the open and closed impact modes. A gear shifting assembly for adjusting the working speed of the actuating assembly is also provided on the gearbox housing 1.

[0031] The power tool of this invention has a compact structure. A liquid oil cavity is formed between the gearbox housing 1 and the intermediate connecting cover 3 via a first oil seal 5 and a second oil seal 6. This cavity allows the actuating and driven components to be placed within the liquid oil cavity. Specifically, the first cam 9 and second cam 10, which perform impact operations, provide real-time lubrication, preventing wear on components and improving the overall sealing and operational stability of the machine, thereby extending the service life of the power tool. The lubrication assembly includes an oil injection channel with an oil plug at the opening to reduce oil change frequency and ensure the tool's effectiveness. Magnetic components can also be installed on the oil plug to adsorb iron filings and other debris generated by the operation of various parts in the liquid oil. The design of the impact adjustment component can adjust the axial movement of the output shaft 7. When the output shaft 7 has a certain amount of axial movement, the power tool can be put into impact mode through the cooperation of the impact adjustment component and the actuation component. When the output shaft 7 has little or no axial movement, the output shaft 7 can only rotate, that is, the power tool turns off the impact mode and performs rotary drilling mode. This allows the power tool to flexibly turn on and off the impact mode, improving the tool's flexibility and versatility.

[0032] Specifically, the actuating assembly includes a first cam 9, a second cam 10, a low-speed gear 11, a clutch cam 12, and a high-speed gear 13, which are sequentially sleeved on the output shaft 7. The first cam 9 is sleeved on the output shaft 7 via a first spline sleeve 14. The second cam 10 is fixedly connected to the gearbox housing 1 (it can be fixedly connected by three bolts with a spacing design). The clutch cam 12 is sleeved on the output shaft 7 via a second spline sleeve 15. The second cam 10 is sleeved with one end of the low-speed gear 11 and forms a movable gap with the first cam 9. The second spline sleeve 14... The clutch cam 12 is provided with a raceway 16, and steel balls 8 that roll on the raceway 16 are elastically arranged at intervals on the clutch cam 12. The low-speed gear 11 and the high-speed gear 13 are meshed with the driven component. The clutch cam 12 is adjusted to cooperate with the low-speed gear 11 or the high-speed gear 13 through the shifting component. The low-speed gear 11 and the high-speed gear 13 are meshed with the driven component. Connecting seats are symmetrically arranged at both ends of the clutch cam 12. The low-speed gear 11 and the high-speed gear 13 are both provided with connecting grooves with the same structure on the side facing the clutch cam 12. The connecting seats and the connecting grooves are engaged and locked together.

[0033] The aforementioned actuation assembly, by sequentially arranging the first cam 9 and second cam 10 (which collide with each other), the high-speed and low-speed gears for speed adjustment, and the impact adjustment component on the output shaft 7, results in a more compact structure and more stable impact operation. Furthermore, the fit between the two spline sleeves and the gear shaft 7 limits the distance between the high-speed and low-speed gears, and also limits the position of the clutch cam 12 in relation to the high-speed and low-speed gears, thus enhancing the tool's impact stability and machining accuracy. The design of the raceway 16 on the first spline sleeve 15 and the fit of the elastic steel ball 8 structure on the clutch cam 12 further prevents the clutch cam 12 from axially wobbling on the output shaft 7, thereby further improving the stability of the power tool. The working speed of the tool can be adjusted simply by operating the shifting component, making operation convenient and improving the tool's flexibility. Figure 2 As shown, the low-speed gear 11 is fitted with the clutch cam 12, so that the gear shaft 25 drives the low-speed gear 11 and the clutch cam 12 to rotate together, and then the clutch cam 12 drives the output shaft 7 to rotate.

[0034] Specifically, the impact adjustment assembly includes a first fixing ring 17, a second fixing ring 18, and a third fixing ring 19 sequentially sleeved on the output shaft 7. The first fixing ring 17 is connected to the gearbox housing 1. One end of the second fixing ring 18 is sleeved inside the first fixing ring 17. The third fixing ring 19 is elastically connected to the output shaft 7. A spring 46 is provided between the third fixing ring 19 and the second fixing ring 18. The side of the third fixing ring 19 facing the second fixing ring 18 is provided with slots 20 at intervals. A corresponding locking block 21 is provided on the second fixing ring 18. A knob 22 is also sleeved on the outer wall of the third fixing ring 19.

[0035] In the above design, during operation: by rotating knob 22, when the locking block 21 on the second fixed ring 18 aligns with the locking groove 20 on the third fixed ring 19, the axial movement of the output shaft 7 is large. When the outer end of the output shaft 7 touches the working carrier, it compresses the output shaft 7 inward, causing the third fixed ring 19 to press against the second fixed ring 18. Then, the spring 46 between the second fixed ring 18 and the third fixed ring 19 rebounds, thus causing the output shaft 7 to move axially. This causes the first cam 9 to collide with or disengage from the second cam 10, forming a reciprocating impact operation, i.e., the tool operates in impact mode; rotating knob 22 to the locking block 21 and locking groove 20 on the third fixed ring 19 results in a large axial movement of the output shaft 7. When the slots 20 are misaligned, a very small gap is formed between the outer surface of the locking block 21 and the surface of the third fixing ring 19. This means that the axial movement of the output shaft 7 is very small. When the outer end of the output shaft 7 touches the working carrier, it cannot compress the output shaft 7 inward to make axial movement, i.e., it cannot perform reciprocating impact work. At this time, the tool performs the drilling function of rotating the output shaft 7. The design of the above structure facilitates the change of the power tool's operating mode. Moreover, even if the power switch of the tool is turned on, as long as the outer end of the output shaft 7 does not touch the working carrier to apply force, the output shaft 7 will not work. This can improve the safety of the tool and increase the flexibility and convenience of its use.

[0036] Specifically, the inner ring of the second fixed ring 18 is provided with grooves 23 at intervals, and steel balls 8 are provided on the output shaft 7 corresponding to the grooves 23. The inner ring of the third fixed ring 19 is provided with grooves 24 at intervals, and steel balls 8 connected by elastic elements are provided on the output shaft 7 corresponding to the grooves 24. The above design, with the grooves 23 and steel balls 8, can improve the axial movement stability of the second fixed ring 18, that is, the stability of impact operation; the design of the grooves 24 and the elastically connected steel balls 8 facilitates the synchronous rotation adjustment of the third fixed ring 19 and the knob 22, improving the convenience and stability of operation.

[0037] Specifically, the driven assembly includes a gear shaft 25, one end of which is connected to the gearbox housing 1 via a ball bearing 48, and the other end is connected to the intermediate connecting cover 3 via a ball bearing 48. The low-speed gear 11 and the high-speed gear 13 are respectively meshed with the gear shaft 25. A gear 26 is sleeved on the gear shaft 25. The drive assembly includes a stator assembly 27, a rotor assembly 28, and a drive shaft 29. The stator assembly 27 and the rotor assembly 28 are both disposed in the motor mounting housing 2. One end of the drive shaft 29 is connected to the motor mounting housing 2 via a ball bearing 48, and the other end is connected to the intermediate connecting cover 3 via a ball bearing 48 and meshes with the gear 26.

[0038] In the above design, since the driven component needs to mesh with both the actuating component and the driving component, the driven component is placed between the gearbox housing 1 and the intermediate connecting cover 3. This can improve the connection stability and ensure the stability of the tool during operation. In order to improve the connection stability of the gear shaft 25, washers, friction plates, disc springs and other accessories can be fitted at the gear 26 connection point to reduce the wear of the gear 26 and improve the connection stability, thereby improving the working stability of the power tool.

[0039] Specifically, the shift assembly includes a fixed rod 30, a first movable seat 31, a second movable seat 32, a rotating seat 33, and an adjusting seat 34. The two ends of the fixed rod 30 are respectively connected to the gearbox housing 1 and the intermediate connecting cover 3. The first movable seat 31 and the second movable seat 32 are movably connected to the fixed rod 30. The two ends of the first movable seat 31 are bent to form a first limiting piece and a first moving end. The two ends of the second movable seat 32 are bent to form a second limiting piece and a second moving end. The second movable seat 32 passes through the first movable seat 31, with the second movable piece located inside the first movable piece and forming a gap. The second moving end is located outside the first moving end. A spring 46 is also sleeved on the fixed rod 30, and the spring 46 is located between the second moving end and the second movable piece. A limiting post 35 is provided on one side of the seat 33, and a slide 36 is provided on the other side. The limiting post 35 is located within the gap formed by the first moving plate and the second moving plate. The slide 36 extends out of the gearbox housing 1 and is connected to the adjusting seat 34 by screws. The adjusting seat 34 moves elastically along the slide 36. The gearbox housing 1 is provided with a limiting groove 37 for the rotation of the adjusting seat 34. Two rotating blocks 38 are provided on the adjusting seat 34. Two steel balls 8 are connected to the rotating blocks 38 by elastic elements. Two limiting grooves 37 are provided accordingly. A fixing groove 39 for the steel balls 8 is provided in the limiting groove 37. A limiting hole 40 is provided on the first moving seat 31, and a limiting block 41 is provided on the second moving seat 32. The limiting block 41 passes through and moves within the limiting hole 40.

[0040] The design of the above-mentioned shifting component is simple in structure and easy to install. Specifically, the adjusting seat 34 is pressed down, causing the adjusting seat 34 to press down along the slide seat 36, so that the rotating block 38 on the adjusting seat 34 presses against the limiting groove 37. At this time, the steel ball 8 on the rotating block 38 is locked inward, and the rotating block 38 can rotate along the limiting groove 37, thereby driving the rotating seat 33 to rotate. Then, the upper limit post 35 of the rotating seat 33 first drives the second moving seat 32 to move. When the moving seat 41 abuts against one end of the limiting hole 40, it simultaneously drives the first moving seat 31 to move. The first moving seat 31 drives the clutch cam 12 to move. At this time, the clutch cam 12 completes the process of disengaging from the low-speed gear 11 and engaging with the high-speed gear 13. When it is necessary to change the state, the same operation can be performed, which is convenient.

[0041] Specifically, the motor mounting housing 2 is also provided with a fan blade 42 and a fan blade baffle 47, located between the drive assembly and the intermediate connecting cover 3. The control assembly includes a controller, a power switch button 43, a light panel assembly, and a power connection wire. The handle housing 4 is also provided with a main handle 44, and the power switch button 43 is located on the main handle 44. An auxiliary handle 45 is also provided on the outer side of the gearbox housing 1 away from the intermediate connecting cover 3. The above design features a main handle 44 for easy handheld use, and an adjustable auxiliary handle 45 for more stable and safer operation. To further enhance the operability of the auxiliary handle 45, a non-slip rubber sleeve can be fitted on it. The power switch button 43 is conveniently positioned for easy control and can be a normally open type to prevent the tool from continuing to operate after being released from the user's hand, thus eliminating safety hazards. A battery compartment can also be located at the main handle 44 to house a battery for powering the drive components. The indicator panel provides information on the tool's on / off status, workload, remaining battery level, and alarms, improving tool safety and extending its lifespan.

[0042] To dissipate heat from the drive and control components, heat dissipation holes can be provided at corresponding positions on the side walls of the handle housing 4 and the motor mounting housing 2, thereby improving the stability and service life of the tool.

[0043] To improve the accuracy of the tool's impact drilling, grooving and other operations, one or more levels can be installed on the connecting cover 3 in the middle of the gear housing 1 or motor mounting housing 2. For example, two level columns can be symmetrically set on both sides of the motor mounting housing 2. This way, whether the power tool is operated with the left hand or the right hand, it can be seen very intuitively, which is especially convenient for left-handed users and can improve the ease of operation of the tool.

[0044] To improve the support stability of each bearing location, accessories such as washers and retaining rings can be installed. For power tool products involving sealing connections, screw accessories can be selected, and for sleeve-type sealing connections, sealing rings and other accessories can be added. Among them, the bearings at each location can be selected as needed, such as needle roller bearings and ball bearings, to improve the connection sealing and stability of the power tool, thereby improving the tool's stability, accuracy, and safety in use.

[0045] The above are merely preferred embodiments of the present invention and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should recognize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present invention should be included within the protection scope of the present invention.

Claims

1. A power tool with an openable and closable impact mode and low wear, comprising a gearbox housing and a motor mounting housing, wherein one end of the motor mounting housing is connected to the gearbox housing via an intermediate connecting cover, and the other end is connected to a handle housing, characterized in that: An impact structure is provided between the gearbox housing and the intermediate connecting cover. The impact structure includes an output shaft and a driven assembly. One end of the output shaft extends sequentially into and is connected to the gearbox housing and the intermediate connecting cover via a bearing. The other end of the output shaft is located on the outside of the gearbox housing, and an impact adjustment assembly is sleeved on the outer end of the output shaft. An actuating assembly is provided between the output shaft and the inner wall of the gearbox housing. The driven assembly is located below the actuating assembly and passes through the gearbox housing and the intermediate connecting cover, and the driven assembly is meshed with the actuating assembly. A [missing information - likely a continuation of the previous sentence] is provided between the motor mounting housing and the intermediate connecting cover. The drive assembly includes a sealed cavity for filling with liquid oil formed between the gearbox housing and the intermediate connecting cover via an oil seal. An oil injection assembly is provided on the gearbox housing to supply fluid into the sealed cavity. The drive assembly is meshed with the driven assembly. A control assembly is located inside the handle housing and is electrically connected to the drive assembly. The control assembly electrically controls the coordinated operation of the drive assembly, driven assembly, and actuating assembly. An impact adjustment assembly controls the axial movement of the output shaft, enabling the switching between open and closed impact modes. A gear shifting assembly for adjusting the working speed of the actuating assembly is also provided on the gearbox housing.

2. The power tool with an openable / closable impact mode and low wear according to claim 1, characterized in that: The actuating assembly includes a first cam, a second cam, a low-speed gear, a clutch cam, and a high-speed gear sequentially mounted on the output shaft. The first cam is mounted on the output shaft via a first spline sleeve, the second cam is fixedly connected to the gearbox housing, and the clutch cam is mounted on the output shaft via a second spline sleeve. The second cam is engaged with one end of the low-speed gear and forms a movable gap with the first cam. The second spline sleeve is provided with a raceway, and the clutch cam is elastically provided with steel balls that roll on the raceway at intervals. The clutch cam is adjusted to engage with the low-speed gear or the high-speed gear by the shifting assembly, and then operates in conjunction with the impact adjustment assembly.

3. The power tool with an openable / closable impact mode and low wear according to claim 2, characterized in that: The low-speed gear and the high-speed gear are respectively meshed with the driven component. The two ends of the clutch cam are symmetrically provided with connecting seats. The low-speed gear and the high-speed gear are each provided with a connecting groove with the same structure on the side facing the clutch cam. The connecting seats and the connecting grooves are engaged and snapped together.

4. The power tool with an openable / closable impact mode and low wear according to claim 2, characterized in that: The impact adjustment assembly includes a first fixing ring, a second fixing ring, and a third fixing ring sequentially sleeved on the output shaft. The first fixing ring is connected to the gearbox housing. One end of the second fixing ring is sleeved inside the first fixing ring. The third fixing ring is elastically connected to the output shaft. A spring is provided between the third fixing ring and the second fixing ring. The side of the third fixing ring facing the second fixing ring is provided with slots at intervals. A corresponding locking block is provided on the second fixing ring. A knob is also sleeved on the outer wall of the third fixing ring.

5. A power tool with an openable / closable impact mode and low wear according to claim 4, characterized in that: The inner ring of the second fixing ring is provided with a groove at intervals, and the output shaft is provided with a steel ball corresponding to the groove. The inner ring of the third fixing ring is provided with a groove at intervals, and the output shaft is provided with a steel ball connected by an elastic element corresponding to the groove.

6. A power tool with an openable / closable impact mode and low wear according to claim 5, characterized in that: The driven assembly includes a gear shaft, one end of which is connected to the gearbox housing via a bearing, and the other end of which is connected to the intermediate connecting cover via a bearing. The low-speed gear and the high-speed gear are respectively meshed with the gear shaft. Gears are sleeved on the gear shaft. The driving assembly includes a stator assembly, a rotor assembly, and a drive shaft. The stator assembly and the rotor assembly are both disposed within a motor mounting housing. One end of the drive shaft is connected to the motor mounting housing via a bearing, and the other end is connected to the intermediate connecting cover via a bearing and meshes with the gears.

7. A power tool with an openable / closable impact mode and low wear according to claim 6, characterized in that: The shifting assembly includes a fixed rod, a first movable seat, a second movable seat, a rotating seat, and an adjusting seat. The two ends of the fixed rod are respectively connected to the gearbox housing and the intermediate connecting cover. The first and second movable seats are movably connected to the fixed rod. The two ends of the first movable seat are bent to form a first limiting piece and a first movable end. The two ends of the second movable seat are bent to form a second limiting piece and a second movable end. The second movable seat passes through the first movable seat, with the second movable piece located inside the first movable piece and forming a gap. The second movable end is located outside the first movable end. A spring is also sleeved on the fixed rod, located between the second movable end and the second movable piece. A limiting post is provided on one side of the rotating seat, and a sliding seat is provided on the other side. The limiting post is located within the gap formed by the first and second movable pieces. The sliding seat extends out of the gearbox housing and is connected to the adjusting seat by screws. The adjusting seat moves elastically along the sliding seat. A limiting groove for the rotation of the adjusting seat is provided on the gearbox housing.

8. A power tool with an openable / closable impact mode and low wear according to claim 7, characterized in that: The adjusting seat is provided with two rotating blocks, and two steel balls are connected to the rotating blocks by elastic elements. Two limiting grooves are provided accordingly, and a fixing groove for embedding the steel balls is provided in the limiting groove. The first moving seat is provided with a limiting hole, and the second moving seat is provided with a limiting block. The limiting block passes through and moves within the limiting hole.

9. A power tool with an openable / closable impact mode and low wear according to claim 1, characterized in that: The motor mounting housing is also provided with a fan blade and a fan blade baffle, located between the drive assembly and the intermediate connecting cover. The control assembly includes a controller, a power switch button, a light panel assembly, and a power connection wire. The handle housing is also provided with a main handle, and the power switch button is located on the main handle. An auxiliary handle is also fitted on the outer side of the gearbox housing away from the intermediate connecting cover.

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