Low-abrasion electric tool capable of opening and closing impact mode

Abstract

The invention provides a low-wear electric tool capable of opening and closing an impact mode, the electric tool comprises a gearbox shell, a motor mounting shell, a middle connecting cover and a handle shell, an impact structure is arranged between the gearbox shell and the middle 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, and the actuating assembly and the impact adjusting assembly are arranged in the gearbox shell. The driven assembly is connected with the actuating assembly in a meshed mode, a driving assembly is arranged between the motor installation shell and the middle connecting cover, a sealing cavity used for being filled with liquid oil is formed between the gearbox shell and the middle connecting cover through an oil sealing piece, an oil injection assembly communicated with the sealing cavity is arranged on the gearbox shell, and the driving assembly is connected with the driven assembly in a meshed mode. A control assembly is arranged in the handle shell. The actuating assembly and the driven assembly can be lubricated with oil in real time, work abrasion of spare and accessory parts is prevented, the mode of opening and closing the impact tool can be flexibly switched, and the use convenience of the tool is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power tools, and more particularly to a power tool capable of opening and closing an impact mode and having low wear. Background Art

[0002] A power tool is a handheld or movable mechanical tool that uses a motor and drives a working head through a transmission mechanism. Compared with traditional manual tools, its advantages lie in labor saving and high efficiency. There are various types of power tools, and different power tools can be selected according to different usage scenarios and functions. Impact drills are power tools that are currently used more frequently. An impact drill is based on an ordinary electric drill, with a driving mechanism added, and through the combination of structures such as balls and gears, the drill bit can be reciprocally struck to facilitate drilling in hard objects. The driving mechanism of an impact drill generally realizes high-frequency back-and-forth strikes through the interaction of two impact gears.

[0003] For example, the patent with the publication number CN210208779U discloses an impact drill, which includes a housing and an impact drill output shaft disposed in the housing and extending out of the housing from the front end of the housing. A drill chuck is provided at the front end of the impact drill output shaft, and a large gear is sleeved on the rear part of the impact drill output shaft; it also includes a first driving mechanism for driving the drill bit to rotate around the axis of the impact drill output shaft and a second driving mechanism for driving the drill bit to frequently impact along the axial direction of the impact drill output shaft; the first driving mechanism includes a motor disposed in the housing, the output shaft of the motor is a gear shaft, the gear shaft meshes with the large gear, and a grease throwing ring and an oil retaining ring are sleeved on the rear part of the gear shaft near the front bearing of the motor. The front outer wall of the grease throwing ring is provided with an annular flange, and the rear end is provided with an annular embedding portion, and the annular embedding portion is embedded between the inner wall of the oil retaining ring and the outer wall of the gear shaft. During operation, the grease throwing ring rotates synchronously with the gear shaft and throws grease around and is blocked by the annular flange thereon. The setting of the oil retaining ring and the grease throwing ring can effectively prevent lubricating grease from entering the front bearing of the motor, reduce bearing wear, and increase the service life of the impact drill.

[0004] However, when the rotatable impact gear rotates at a high speed on the surface of another fixed impact gear, the lubricating grease filled on the surfaces of the two impact gears will be squeezed and thrown out of the range of the impact gear surfaces due to the rotation of the impact gears. Over time, the lubricating grease on the impact gear surfaces will become less and less, and the impact gear surfaces will also experience accelerated wear due to lack of lubrication. The wear of the impact gear surfaces 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 object of the present invention is to provide a power tool capable of opening and closing an impact mode and having low wear to solve the problems existing in the above background art.

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

[0007] An electric tool with an openable and closable impact mode and low wear, comprising a gearbox housing, a motor mounting housing. One end of the motor mounting housing is connected to the gearbox housing through an intermediate connection cover, and the other end is connected to a handle housing. An impact structure is provided between the gearbox housing and the intermediate connection cover. The impact structure includes an output shaft and a driven assembly. One end of the output shaft sequentially extends into and is connected to the gearbox housing and the intermediate connection cover through bearings. The other end of the output shaft is located outside 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 is arranged between the gearbox housing and the intermediate connection cover, and the driven assembly is meshed and connected with the actuating assembly. A driving assembly is provided between the motor mounting housing and the intermediate connection cover. A sealed cavity for filling liquid oil is formed between the gearbox housing and the intermediate connection cover through a sealing element. An oil injection assembly for communicating with the sealed cavity is provided on the gearbox housing. The driving assembly is meshed and connected with the driven assembly. A control assembly is provided in the handle housing. The control assembly is electrically connected to the driving assembly, and the control assembly electrically controls the coordinated operation of the driving assembly, the driven assembly, and the actuating assembly. The impact adjustment assembly controls and adjusts the axial movement amount of the output shaft to achieve the transformation of the open and closed impact modes. A shifting assembly for adjusting the working speed of the actuating assembly is also provided on the gearbox housing.

[0008] Preferably, the above-mentioned actuating assembly includes a first cam, a second cam, a low-speed gear, a clutch cam, and a high-speed gear sequentially sleeved on the output shaft. The first cam is sleeved on the output shaft through a first spline sleeve. The second cam is fixedly connected to the inside of the gearbox housing. The clutch cam is sleeved on the output shaft through a second spline sleeve. One end of the second cam is sleeved with the low-speed gear and forms a movable distance from the first cam. A raceway is provided on the second spline sleeve, and steel balls that roll on the raceway are elastically arranged at intervals on the clutch cam. The low-speed gear and the high-speed gear are meshed and connected with the driven assembly. The clutch cam is adjusted to be connected with the low-speed gear or the high-speed gear through the shifting assembly, and then works in cooperation with the impact adjustment assembly.

[0009] Preferably, the above-mentioned low-speed gear and high-speed gear are respectively meshed and connected with the driven assembly. Connection seats are symmetrically arranged at both ends of the clutch cam. Connection grooves with the same structure are provided on the surfaces of the low-speed gear and the high-speed gear facing the clutch cam. The connection seats and the connection grooves are fitted and clamped.

[0010] Preferably, the impact adjustment assembly includes a first fixing ring, a second fixing ring, and a third fixing ring that are 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 arranged between the third fixing ring and the second fixing ring. The outer wall of the third fixing ring is also sleeved with a knob. Grooves are arranged at intervals on one side of the third fixing ring facing the second fixing ring, and corresponding clamping blocks are arranged on the second fixing ring.

[0011] Preferably, the inner ring of the second fixing ring is provided with sliding grooves at intervals. Steel balls are arranged on the output shaft corresponding to the sliding grooves. The inner ring of the third fixing ring is provided with grooves at intervals. Steel balls connected by elastic members are arranged on the output shaft corresponding to the grooves.

[0012] Preferably, the driven assembly includes a gear shaft. One end of the gear shaft is connected to the inside of the gearbox housing through a bearing, and the other end is connected to the inside of the intermediate connection cover through 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 driving assembly includes a stator assembly, a rotor assembly, and a driving shaft. The stator assembly and the rotor assembly are both arranged inside the motor mounting housing. One end of the driving shaft is connected to the inside of the motor mounting housing through a bearing, and the other end is connected to the inside of the intermediate connection cover through a bearing and is meshed with the gear.

[0013] Preferably, the shifting assembly includes a fixing rod, a first moving seat, a second moving seat, a rotating seat, and an adjusting seat. The two ends of the fixing rod are respectively connected to the gearbox housing and the intermediate connection cover. The first moving seat and the second moving seat are movably connected to the fixing rod. The two ends of the first moving seat are bent to form a first limiting piece and a first moving end. The two ends of the second moving seat are bent to form a second limiting piece and a second moving end. The second moving seat is inserted into the first moving seat, and the second moving piece is located inside the first moving piece and forms a spacing. The second moving end is located outside the first moving end. A spring is also sleeved on the fixing rod, and the spring is located between the second moving end and the second moving piece. A limiting post is arranged on one side of the rotating seat, and a sliding seat is arranged on the other side. The limiting post is located within the spacing formed by the first moving piece and the second moving piece. The sliding seat passes through the gearbox housing and is connected to the adjusting seat by screws, and the adjusting seat elastically moves along the sliding seat. A limiting groove for the rotation of the adjusting seat is arranged on the gearbox housing.

[0014] Preferably, two rotating blocks are arranged on the adjusting seat. Two steel balls are connected to the rotating blocks through elastic members. Two corresponding limiting grooves are arranged. Fixing grooves for the steel balls to be embedded are arranged in the limiting grooves. A limiting hole is arranged on the first moving seat, and a limiting block is arranged on the second moving seat. The limiting block penetrates and moves within the limiting hole.

[0015] Preferably, a wind blade and a wind blade baffle are further arranged in the motor mounting shell, and are located between the drive assembly and the intermediate connection cover. The control assembly includes a controller, a power switch button, a lamp board assembly and a power connection line. A main handle is further arranged on the handle shell. The power switch button is arranged on the main handle. An auxiliary handle is further sleeved on the outer side of one end of the gearbox shell away from the intermediate connection cover.

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

[0017] (1) The electric tool of the present invention has a compact structure. A liquid oil cavity is formed between the gearbox shell and the intermediate connection cover through the first oil seal and the second oil seal, so that the actuating component and the driven component can be placed in the liquid oil cavity. In particular, the first cam and the second cam for impact work can perform real-time lubricating work, prevent the working wear of the spare parts, thereby improving the connection tightness and working stability of the whole machine, and thus improving the service life of the electric tool;

[0018] (2) The design of the impact adjustment component can adjust the axial movement amount of the output shaft. When the output shaft has a certain axial movement amount, through the cooperation of the impact adjustment component and the actuating component, the electric tool can be enabled to work in the impact mode; when the output shaft does not have or has a very small axial movement amount, the output shaft can only perform rotational work, that is, the electric tool closes the impact working mode and performs the rotary drilling mode. In this way, the electric tool can flexibly open and close the impact working mode, improving the use flexibility and versatility of the tool. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0020] Figure 2 is Figure 1 the sectional structural diagram of;

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

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

[0023] Figure 5 is a schematic exploded structural diagram of a partial structure of the actuating component in the present invention;

[0024] Figure 6 is a schematic exploded structural diagram of the impact adjustment component in the present invention;

[0025] Figure 7 is a schematic exploded structural diagram at the position of the shift component in the present invention;

[0026] In the accompanying drawings:

[0027] 1 - Gearbox housing; 2 - Motor mounting housing; 3 - Intermediate connection 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 - Raceway; 17 - First fixing ring; 18 - Second fixing ring; 19 - Third fixing ring; 20 - Card slot; 21 - Card block; 22 - Knob; 23 - Slide groove; 24 - Groove; 25 - Gear shaft; 26 - Gear; 27 - Stator assembly; 28 - Rotor assembly; 29 - Drive shaft; 30 - Fixed rod; 31 - First moving seat; 32 - Second moving seat; 33 - Rotating seat; 34 - Adjusting seat; 35 - Limit post; 36 - Slide seat; 37 - Limit groove; 38 - Rotating block; 39 - Fixed groove; 40 - Limit hole; 41 - Limit block; 42 - Blower blade; 43 - Power switch button; 44 - Main handle; 45 - Auxiliary handle; 46 - Spring; 47 - Blower blade baffle; 48 - Ball bearing; 49 - Needle bearing. Detailed implementation manners

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0029] Embodiment

[0030] As Figures 1-7As shown in the figure, an electric tool with an openable and closable impact mode and low wear includes a gearbox housing 1, a motor mounting housing 2. One end of the motor mounting housing 2 is connected to the gearbox housing 1 through an intermediate connection 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 connection cover 3. The impact structure includes an output shaft 7 and a driven assembly. One end of the output shaft 7 sequentially extends into and is connected to the gearbox housing 1 through a rolling bearing 48 and the intermediate connection cover 3 through a needle bearing 49. The other end of the output shaft 7 is located outside the gearbox housing 1, and an impact adjustment assembly is sleeved on the outer end of the output shaft 7. An actuating assembly is provided between the output shaft 7 and the inner wall of the gearbox housing 1. The driven assembly is located below the actuating assembly and penetrates between the gearbox housing 1 and the intermediate connection cover 3, and the driven assembly is meshed and connected with the actuating assembly. A driving assembly is provided between the motor mounting housing 2 and the intermediate connection cover 3. A sealing cavity for filling liquid oil is formed between the gearbox housing 1 and the intermediate connection cover 3 through oil seal parts (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 connection cover 3 and the driving assembly). An oil injection assembly for communicating with the sealing cavity is provided on the gearbox housing 1. The driving assembly is meshed and connected with the driven assembly. A control assembly is provided in the handle housing 4. The control assembly is electrically connected to the driving assembly, and the cooperation work of the driving assembly, the driven assembly and the actuating assembly is electrically controlled by the control assembly. The impact adjustment assembly controls and adjusts the axial movement amount of the output shaft 7 to realize the transformation of the open and closed impact modes. A shift assembly for adjusting the working speed of the actuating assembly is also provided on the gearbox housing 1.

[0031] The electric tool of the present invention has a compact structure. A liquid oil cavity is formed between the gearbox housing 1 and the intermediate connection cover 3 through the first oil seal 5 and the second oil seal 6, so that the actuating assembly and the driven assembly can be placed in the liquid oil cavity. Especially the first cam 9 and the second cam 10 for impact work can play a real-time lubricating role to prevent the working wear of spare parts, thereby improving the connection tightness and working stability of the whole machine, and thus improving the service life of the electric tool. Among them, the oil injection assembly includes an oil injection channel, and an oil plug is provided at the opening of the oil injection channel. In order to reduce the oil change frequency and ensure the use effectiveness of the tool, a magnetic part can also be provided on the oil plug to adsorb iron filings and sundries generated by the work of each accessory in the liquid oil; the design of the impact adjustment assembly can adjust the axial movement amount of the output shaft 7. When the output shaft 7 has a certain axial movement amount, through the cooperation work of the impact adjustment assembly and the actuating assembly, the electric tool can be made to start the impact mode; when the output shaft 7 does not have or has a very small axial movement amount, the output shaft 7 can only perform rotational work, that is, the electric tool closes the impact working mode and performs the rotary drilling mode. In this way, the electric tool can flexibly open and close the impact working mode, improving the use flexibility and versatility of the tool.

[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 that are sequentially sleeved on the output shaft 7. The first cam 9 is sleeved on the output shaft 7 through a first spline sleeve 14. The second cam 10 is fixedly connected to the inside of the gearbox housing 1 (which can be fixedly connected by 3 bolts with spaced design). The clutch cam 12 is sleeved on the output shaft 7 through a second spline sleeve 15. One end of the second cam 10 is sleeved with the low-speed gear 11 and forms a movable spacing with the first cam 9. A raceway 16 is provided on the second spline sleeve 15, 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 assembly. The cooperation connection between the clutch cam 12 and the low-speed gear 11 or the high-speed gear 13 is adjusted through a shifting assembly. The low-speed gear 11 and the high-speed gear 13 are meshed with the driven assembly. Connection seats are symmetrically arranged at both ends of the clutch cam 12. Connection grooves with the same structure are provided on the surfaces of the low-speed gear 11 and the high-speed gear 13 facing the clutch cam 12. The connection seats and the connection grooves are fitted and clamped together.

[0033] For the actuating assembly designed as above, by sequentially arranging the first cam 9 and the second cam 10 that work by mutual impact, the high- and low-speed gears with speed regulation functions, and the impact adjustment assembly on the output shaft 7, the structure is more compact and the impact work is more stable. Then, through the cooperation relationship between the two spline sleeves and the gear shaft 7, the distance between the high- and low-speed gears is limited, and at the same time, the position state of the clutch cam 12 fitted with the high- and low-speed gears is also limited, which can make the impact stability of the tool stronger and the machining accuracy more stable. The design of the raceway 16 on the first spline sleeve 15 and the cooperative design of the elastic steel ball 8 structure on the clutch cam 12 can further prevent the bad phenomenon that the clutch cam 12 axially sways back and forth on the output shaft 7 by itself, thereby further improving the stability of the electric tool. Only by operating the shifting assembly can the cooperation relationship between the clutch cam 12 and the high- and low-speed gears be adjusted, thereby adjusting the working speed of the tool. The operation is convenient and the use flexibility of the tool can be improved. As Figure 2 shown, the low-speed gear 11 is fitted with the clutch cam 12. In this way, 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 which are sequentially sleeved on the output shaft 7. The first fixing ring 17 is connected to the gear box housing 1, one end of the second fixing ring 18 is sleeved in the first fixing ring 17, and 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, and a card slot 20 is provided at intervals on a side surface of the third fixing ring 19 facing the second fixing ring 18, a card block 21 is correspondingly provided on the second fixing ring 18, and a knob 22 is also sleeved on the outer wall of the third fixing ring 19.

[0035] The above design, when working: by turning the knob 22, when the blocks 21 on the second fixing ring 18 are respectively opposite to the slots 20 on the third fixing 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, the output shaft 7 is compressed inwardly, so that the third fixing ring 19 is pressed against the second fixing ring 18, and then rebounds through the spring 46 between the second fixing ring 18 and the third fixing ring 19. In this way, the output shaft 7 moves axially, which will drive the first cam 9 and the second cam 10 to collide or disengage, thereby forming a reciprocating impact work, that is, the tool performs the impact function mode; rotate until the blocks 21 and the blocks are opposite to each other. When the grooves 20 are staggered, a very small gap is formed between the outer surface of the block 21 and the surface of the third fixing ring 19, that is, the axial movement of the output shaft 7 is very small. When the outer end of the output shaft 7 touches the working carrier, the output shaft 7 cannot be compressed inward to perform axial movement, that is, reciprocating impact work cannot be performed. At this time, the tool performs the drilling function of rotating the output shaft 7. The design of the above structure is convenient for changing the use mode of the electric tool, and 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, which can improve the safety of the tool and improve the flexibility and convenience of the tool.

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

[0037] Specifically, the driven assembly includes a gear shaft 25. One end of the gear shaft 25 is connected to the inside of the gearbox housing 1 through a ball bearing 48, and the other end is connected to the inside of the intermediate connection cover 3 through a ball bearing 48. The low-speed gear 11 and the high-speed gear 13 are respectively meshed and connected to the gear shaft 25. A gear 26 is sleeved on the gear shaft 25. The driving 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 arranged in the motor mounting housing 2. One end of the drive shaft 29 is connected to the inside of the motor mounting housing 2 through a ball bearing 48, and the other end is connected to the inside of the intermediate connection cover 3 through a ball bearing 48 and is meshed and connected to the gear 26.

[0038] In the above design, since the driven assembly needs to be meshed with the actuating assembly and the driving assembly respectively for operation, the driven assembly is arranged between the gearbox housing 1 and the intermediate connection cover 3, which can improve the connection stability and ensure the stability during the use of the tool. To improve the connection stability of the gear shaft 25, accessories such as washers, friction plates, and disc springs can also be sleeved at the connection of the gear 26 to reduce the wear of the gear 26 and improve the connection stability, thereby enhancing the working stability of the power tool.

[0039] Specifically, the shifting assembly includes a fixed rod 30, a first moving seat 31, a second moving seat 32, a rotating seat 33 and an adjusting seat 34. Both ends of the fixed rod 30 are respectively connected to the gearbox housing 1 and the intermediate connection cover 3. The first moving seat 31 and the second moving seat 32 are movably connected to the fixed rod 30. Both ends of the first moving seat 31 are bent to form a first limiting piece and a first moving end. Both ends of the second moving seat 32 are bent to form a second limiting piece and a second moving end. The second moving seat 32 is inserted into the first moving seat 31, and the second moving piece is located inside the first moving piece with a spacing formed. 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 moving piece. A limiting column 35 is arranged on one side of the rotating seat 33, and a sliding seat 36 is arranged on the other side. The limiting column 35 is located within the spacing formed by the first moving piece and the second moving piece. The sliding seat 36 passes through the gearbox housing 1 and is connected to the adjusting seat 34 by screws, and the adjusting seat 34 moves elastically along the sliding seat 36. A limiting groove 37 for the rotation of the adjusting seat 34 is arranged on the gearbox housing 1. Two rotating blocks 38 are arranged on the adjusting seat 34. Two steel balls 8 are connected to the rotating blocks 38 through elastic members. Two corresponding limiting grooves 37 are provided. Fixing grooves 39 for the steel balls 8 to be embedded are arranged in the limiting grooves 37. A limiting hole 40 is arranged on the first moving seat 31, and a limiting block 41 is arranged on the second moving seat 32. The limiting block 41 penetrates into and moves within the limiting hole 40.

[0040] The design of the above shifting component is simple and convenient for assembly. Specifically, press down the adjusting seat 34, so that the adjusting seat 34 presses down along the sliding seat 36, and 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 locks inward, and the rotating block 38 can rotate along the limiting groove 37, thereby driving the rotating seat 33 to rotate. Then, the limiting post 35 on the rotating seat 33 first drives the second moving seat 32 to move. When the limiting block 41 abuts against one end of the limiting hole 40, it also 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 the state needs to be changed, just operate in the same way, and the operation is convenient.

[0041] Specifically, a wind leaf 42 and a wind leaf baffle 47 are also arranged in the motor mounting shell 2 and are located between the driving component and the intermediate connecting cover 3. The control component includes a controller, a power switch button 43, a lamp board component and a power connecting wire. A main handle 44 is also arranged on the handle housing 4. The power switch button 43 is arranged on the main handle 44. An auxiliary handle 45 is also sleeved on the outer side of one end of the gearbox housing 1 away from the intermediate connecting cover 3. With the above design, the design of the main handle 44 is convenient for holding the tool. Coupled with the design of the auxiliary handle 45, and the angle of the auxiliary handle 45 can be adjusted, so that the power tool can be operated more stably and safely. In order to improve the controllability of the auxiliary handle 45, an anti-slip rubber sleeve can also be sleeved on the auxiliary handle 45; the position design of the power switch button 43 is convenient for control operation. Among them, the power switch button 43 can be a normally open power switch button, which can prevent the power tool from continuing to work after leaving the user's hand, thus eliminating potential safety hazards; among them, a battery slot can also be arranged at the main handle 44, and a battery for supplying power to the driving component is installed in the battery slot, which is convenient for power supply; the design of the lamp board component is convenient for prompting the on / off state, working load condition, displaying the remaining battery capacity, alarm, etc. of the power tool, and improving the use safety and service life of the tool.

[0042] In order to dissipate heat from the driving component and the control component, heat dissipation holes can also be opened at corresponding positions on the side walls of the handle housing 4 and the motor mounting shell 2, so as to improve the use stability and service life of the tool.

[0043] In order to improve the accuracy of operations such as impact drilling and grooving of the tool, one or more spirit levels can also be arranged on the gear housing 1 or the intermediate connecting cover 3 of the motor mounting shell 2. For example, 2 horizontal posts can be symmetrically arranged on both sides of the motor mounting shell 2. In this way, whether operating the power tool with the left hand or the right hand, it can be seen very intuitively, especially convenient for left-handed people to use, and can improve the operation convenience of the tool.

[0044] To improve the support stability of the installation positions of each bearing, accessories such as washers and retaining rings can be provided as a set. For the positions involving sealed connections in power tool products, screw accessories can be selected. For sleeve-type sealed connections, accessories such as sealing rings can be added. Among them, the bearings at each position can be selected as needle bearings, ball bearings, etc. according to needs, so as to improve the connection sealing performance, stability, etc. of the power tool, thereby improving the use stability, accuracy and safety of the tool.

[0045] The above are only the preferred embodiments of the present invention, and do not limit the implementation manners and protection scope of the present invention. For those skilled in the art, it should be realized that all the equivalent replacements and obvious changes made by using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. An electric tool with an on / off impact mode and low wear, comprising a gear box housing and a motor mounting housing, wherein one end of the motor mounting housing is connected to the gear box housing through 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 connection cover, and the impact structure includes an output shaft and a driven component. One end of the output shaft extends into the gearbox housing and the intermediate connection cover in sequence and is connected to the gearbox housing and the intermediate connection cover through a bearing. The other end of the output shaft is located outside the gearbox housing, and an impact adjustment component is sleeved on the output shaft at the outer end. An actuating component is provided between the output shaft and the inner wall of the gearbox housing. The driven component is located below the actuating component and is inserted between the gearbox housing and the intermediate connection cover, and the driven component is meshed and connected with the actuating component. A A driving assembly, a sealed cavity for filling liquid oil is formed between the gear box housing and the intermediate connecting cover through an oil seal, an oil injection assembly that leads to the sealed cavity is provided on the gear box housing, the driving assembly is meshingly connected with the driven assembly, a control assembly is provided in the handle housing, the control assembly is connected with the driving assembly by wires, the control assembly electrically controls the coordinated operation of the driving assembly, the driven assembly and the actuating assembly, the impact adjustment assembly controls and adjusts the axial movement of the output shaft to realize the conversion of the open and closed impact modes, and a shift assembly for adjusting the working speed of the actuating assembly is also provided on the gear box housing.

2. The low-wear electric tool with an on / off impact mode 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 which are sequentially sleeved on the output shaft, and the first cam is sleeved on the output shaft through a first spline sleeve, the second cam is fixedly connected to the gear box housing, the clutch cam is sleeved on the output shaft through a second spline sleeve, the second cam is sleeved with one end of the low-speed gear and forms a movable spacing with the first cam, a raceway is provided on the second spline sleeve, and steel balls rolling on the raceway are elastically provided on the clutch cam at intervals, the clutch cam is adjusted to be connected with the low-speed gear or the high-speed gear through the shifting assembly, and then cooperates with the impact adjustment assembly to work.

3. The low-wear electric tool with an on / off impact mode according to claim 2, characterized in that: The low-speed gear and the high-speed gear are respectively meshed and connected with the driven components, and connecting seats are symmetrically arranged at both ends of the clutch cam. The low-speed gear and the high-speed gear are both provided with connecting grooves with the same structure on the side facing the clutch cam, and the connecting seats and the connecting grooves are matched and snap-fitted.

4. The low-wear electric tool with an on / off impact mode 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 which are sequentially sleeved on the output shaft, the first fixing ring is connected to the gear box housing, one end of the second fixing ring is sleeved in the first fixing ring, the third fixing ring is elastically connected to the output shaft, a spring is arranged between the third fixing ring and the second fixing ring, and a card slot is arranged at intervals on a side surface of the third fixing ring facing the second fixing ring, a card block is correspondingly arranged on the second fixing ring, and a knob is also sleeved on the outer wall of the third fixing ring.

5. The low-wear electric tool with on / off impact mode according to claim 4, characterized in that: The inner ring of the second fixing ring is provided with sliding grooves at intervals, and steel balls are provided on the output shaft corresponding to the sliding grooves. The inner ring of the third fixing ring is provided with grooves at intervals, and steel balls connected by elastic members are provided on the output shaft corresponding to the grooves.

6. The low-wear electric tool with on / off impact mode according to claim 5, characterized in that: The driven component includes a gear shaft, one end of which is connected to the gear box housing through a bearing, and the other end is connected to the intermediate connecting cover through a bearing. The low-speed gear and the high-speed gear are respectively meshed with the gear shaft, and the gear shaft is sleeved with a gear. The driving component includes a stator component, a rotor component and a driving shaft, and the stator component and the rotor component are both arranged in a motor mounting shell. One end of the driving shaft is connected to the motor mounting shell through a bearing, and the other end is connected to the intermediate connecting cover through a bearing, and is meshed with the gear.

7. The low-wear electric tool with an on / off impact mode according to claim 6, characterized in that: The gear shift assembly includes a fixed rod, a first movable seat, a second movable seat, a rotating seat and an adjusting seat, wherein two ends of the fixed rod are respectively connected to the gear box housing and the intermediate connecting cover, the first movable seat and the second movable seat are movably connected to the fixed rod, the two ends of the first movable seat are bent to form a first limiting plate and a first movable end, the two ends of the second movable seat are bent to form a second limiting plate and a second movable end, the second movable seat is arranged in the first movable seat, and the second movable plate is located on the inner side of the first movable plate and forms a spacing, and the second movable end is located on the outer side of the first movable end, the fixed rod is also provided with a spring, and the spring is located between the second movable end and the second movable plate, a limiting column is provided on one side of the rotating seat, and a sliding seat is provided on the other side, the limiting column is located in the spacing formed by the first movable plate and the second movable plate, the sliding seat passes through the gear box housing and is connected to the adjusting seat by screws, and the adjusting seat moves elastically along the sliding seat, and a limiting groove for adjusting the rotation of the seat is provided on the gear box housing.

8. The low-wear electric tool with on / off impact mode according to claim 7, characterized in that: Two rotating blocks are arranged on the adjustment seat, two steel balls are connected to the rotating block through an elastic member, two limiting grooves are arranged correspondingly, and a fixing groove for embedding the steel balls is arranged in the limiting groove, a limiting hole is arranged on the first movable seat, and a limiting block is arranged on the second movable seat, and the limiting block penetrates into and moves in the limiting hole.

9. The low-wear electric tool with on / off impact mode according to claim 1, characterized in that: The motor mounting shell is also provided with a fan blade and a fan blade baffle, and is located between the drive assembly and the middle connecting cover. The control assembly includes a controller, a power switch button, a light board assembly and a power connecting line. The handle shell is also provided with a main handle, and the power switch button is arranged on the main handle. An auxiliary handle is also sleeved on the outer side of one end of the gear box shell away from the middle connecting cover.

Images