Electric tool

Abstract

The utility model discloses an electric tool which comprises a tool shell, a striking block, a driving mechanism and an output shaft, and a striking cavity is formed in the tool shell; the striking block is arranged in the striking cavity and can move back and forth in the striking cavity in a limited manner, and a first through hole penetrating in the moving direction of the striking block is formed in the striking block; the driving mechanism is arranged on one side of the striking cavity, is connected with the striking block and drives the striking block to rotate; the output shaft is arranged on the other side of the striking cavity and exposed out of the tool shell, and the output shaft is connected with the striking block and rotates along with the striking block. The striking block is provided with the through hole, air on the two sides of the striking block can freely circulate in the working process, air pressure on the two sides cannot be obviously changed, and therefore the situation of oil leakage cannot happen.

Description

Technical Field

[0001] The utility model belongs to the technical field of electric tools, in particular to an electric tool. Background Art

[0002] The current mainstream electric impact wrenches and other tools are mainly composed of a tool housing, a power mechanism, a striking block and an output shaft. The driving mechanism drives the striking block and the output shaft to rotate. When the front end of the output shaft encounters resistance, it drives the striking block to move toward the motor side. At the same time, the compression spring at the rear end will be compressed. When the compression spring is compressed to a certain distance, the striking block will be reset. The striking and power output are achieved by moving the striking block back and forth. Since the striking block moves back and forth during operation, a U-shaped air pressure cavity is formed on one side of the striking block compression spring. When the striking block moves toward the motor side, the air pressure in the striking block cavity will move backward with the striking block, causing the air on the rear side of the striking block box to be squeezed and the air pressure to increase. After the air pressure increases, the grease in the striking block box is easy to flow to the motor side, or even squeezed into the motor, causing the machine to leak oil.

[0003] Therefore, in view of the above technical problems, it is necessary to provide an improved electric tool to solve the above problems.

[0004] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to a person skilled in the art. Utility Model Content

[0005] The utility model aims to provide a striking block structure of an electric tool to avoid oil leakage.

[0006] In order to achieve the above purpose, the technical solution provided by a specific embodiment of the utility model is as follows:

[0007] The utility model provides an electric tool, comprising a tool housing, a striking block, a driving mechanism and an output shaft, wherein a striking cavity is formed inside the tool housing; the striking block is arranged in the striking cavity and can move back and forth in a limited manner in the striking cavity, and a first through hole is formed on the striking block, which passes through the striking block along its own moving direction; the driving mechanism is arranged on one side of the striking cavity, and is connected to and drives the striking block to rotate; the output shaft is arranged on the other side of the striking cavity and exposed from the tool housing, and the output shaft is connected to the striking block and rotates with the striking block.

[0008] In one or more embodiments of the present invention, a plurality of the first through holes are provided on the striking block, and the plurality of first through holes are symmetrically distributed on the striking block.

[0009] In one or more embodiments of the present invention, a spring is squeezed between the striking block and the inner wall of the striking cavity, and the spring is arranged on a side of the striking block close to the driving mechanism.

[0010] In one or more embodiments of the present invention, an annular groove is recessed on one side of the striking block facing the driving mechanism, and the annular groove is used to accommodate the spring.

[0011] In one or more embodiments of the utility model, a convex plate is protruded from one end of the output shaft close to the striking block, and a groove for accommodating the convex plate is concavely provided on the striking block, and two blocking parts are protruded inwardly from the side wall of the groove.

[0012] In one or more embodiments of the present utility model, the driving mechanism includes a driving motor and a transmission shaft, the striking block is provided with a second through hole along its own axial direction for the transmission shaft to pass through, the transmission shaft is provided with a first sliding groove along its own circumference, a steel ball is arranged in the first sliding groove, and the striking block is provided with a second sliding groove for accommodating the steel ball, and the diameter of the steel ball is greater than the depth of the first sliding groove.

[0013] In one or more embodiments of the present invention, two first slide grooves and two second slide grooves are respectively provided, the two second slide grooves surround the second through hole, and / or the second slide groove is provided at the bottom of the groove.

[0014] In one or more embodiments of the present invention, the depth of the middle position of the second slide groove along the axial direction of the striking block is greater than the depth of the two ends thereof along the axial direction of the striking block.

[0015] In one or more embodiments of the present invention, the depth of the two ends of the second slide groove in the axial direction of the striking block is greater than the diameter of the steel ball.

[0016] In one or more embodiments of the present invention, a third slide groove connected to the second slide groove is further provided at the bottom of the groove, and the third slide groove is arranged in the middle position of the second slide groove and is used for placing and removing the steel ball.

[0017] Compared with the prior art, the striking block in the utility model is provided with a through hole, so that the air on both sides of the striking block can flow freely during operation, and the air pressure on both sides will not change significantly, so oil leakage will not occur. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a schematic diagram of an electric tool in one embodiment of the utility model;

[0020] Figure 2 A partial cross-sectional view of an electric tool in one embodiment of the utility model;

[0021] Figure 3 This is a schematic diagram of a transmission shaft in one embodiment of the utility model;

[0022] Figure 4 A top view of a striking block in one embodiment of the utility model;

[0023] Figure 5 A top view of a striking block in another embodiment of the present invention;

[0024] Figure 6 A cross-sectional view of a striking block in one embodiment of the utility model;

[0025] Figure 7 This is a schematic diagram of a striking block in one embodiment of the utility model;

[0026] Figure 8 This is a schematic diagram of the rear side of the striking block in one embodiment of the utility model;

[0027] Fig. 9 It is a schematic diagram of an output shaft in one embodiment of the utility model.

[0028] Description of main reference numerals:

[0029] 100-power tool, 10-tool housing, 11-strike chamber, 20-strike block, 21-first through hole, 22-annular groove, 23-groove, 24-blocking part, 25-second slide groove, 26-second through hole, 27-third slide groove, 28-mass part, 31-transmission shaft, 311-first slide groove, 32-drive motor, 40-output shaft, 41-convex plate, 50-spring, 60-steel ball. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0031] like Figure 1-9 As shown, the electric tool 100 in one embodiment of the utility model comprises a tool housing 10, a striking block 20, a driving mechanism and an output shaft 40. A striking cavity 11 is formed inside the tool housing 10, and the striking block 20 is movably disposed in the striking cavity 11. The driving mechanism is disposed on one side of the striking cavity 11, and is connected to and drives the striking block 20 to rotate. The output shaft 40 is disposed on the other side of the striking cavity 11, one end of which is connected to the striking block 20, and the other end is exposed from the tool housing 10.

[0032] The striking chamber 11 is usually a relatively closed chamber, and lubricating oil is usually applied between the striking block 20 and the inner wall of the striking chamber 11 to reduce friction and prevent overheating. In the working state, the operator applies a certain force to press the electric tool 100 against the workpiece to be processed. The front end of the output shaft 40 drives the striking block 40 to move backward after being subjected to the resistance of the workpiece, and resets after the electric tool 100 stops working. The striking block 20 in the utility model is provided with a through first through hole 21, and the first through hole 21 extends along the moving direction of the striking block 20. Therefore, when the striking block 20 moves, the air in the striking chamber 11 can move freely on both sides of the striking block 20 through the first through hole 21, thereby avoiding the situation that when the striking block 20 moves backward (i.e., toward the direction of the driving mechanism) due to air stagnation, the air on one side of the striking block 20 and the driving mechanism is squeezed to cause the lubricating oil to flow out of the striking chamber 11 and cause oil leakage.

[0033] In such Figure 4 In the embodiment shown, two first through holes 21 are provided on the striking block 20. On the premise of ensuring the rigidity of the striking block 20, increasing the number of the first through holes 21 can increase the positions for air movement and further improve the air circulation effect. Of course, the first through holes 21 can also be provided in greater numbers and evenly distributed on the striking block 20, which is not limited in this embodiment.

[0034] like Figure 2As shown, a spring 50 is provided in the striking cavity 11, and the spring is pressed between the striking block 20 and the inner wall of the striking cavity 11 on the driving mechanism side. During use, the output shaft 40 drives the striking block 20 to retreat after being subjected to force, and the spring 50 is deformed and stores energy under the compression, and resets after being deformed to a certain extent, and drives the striking block 20 and the output shaft 40 forward, and the above process is repeated continuously to complete the striking operation.

[0035] Preferably, in order to ensure that the spring 50 is deformed only in the moving direction of the striking block 20 and does not displace or deform in other directions, an annular groove 22 is provided on the side of the striking block 20 facing the driving mechanism to accommodate the spring 50, and the first through hole 21 is connected to the annular groove 22, so that the first through hole 21 is always connected to the striking cavity 11 on one side of the annular groove 22.

[0036] In one embodiment, the first through hole 21 may be arranged to be parallel to the rotation axis of the striking block 20, or may form a certain angle with the rotation axis of the striking block 20, for example Figure 6 As shown in FIG. 1 , the distance from the first through hole 21 to the rotation axis of the striking block 20 gradually increases in the direction toward the output shaft 40 , showing a tendency to spread outward.

[0037] In one embodiment, the first through hole 21 is a circular hole with a diameter ranging from 1.5 mm to 4 mm. Of course, the shape and diameter range of the first through hole 21 can also be set according to the size of the striking block 20, and this embodiment is not limited thereto.

[0038] An annular gap is formed between the striking block 20 and the side wall of the striking cavity 11 , and the size of the gap at different positions during rotation is between 0.8 mm and 2.5 mm.

[0039] It is easy to imagine that a similar annular groove can be provided on the side wall of the striking cavity 11 on the driving mechanism side to limit the spring 50 from both sides, so as to further improve the above effect. Alternatively, the inner diameter of the spring 50 is set to be equal to or slightly smaller than the outer diameter of the transmission shaft at the side wall of the striking cavity 11, that is, the spring 50 is sleeved outside the transmission shaft 31, and the transmission shaft 31 is used to limit the deformation direction of the spring 50.

[0040] In one embodiment, if Fig. 9 As shown, the output shaft 40 is formed with a convex plate 41 at one end in contact with the striking block 20. Figure 4 and 7As shown, a groove 23 is provided at one end of the striking block 20 facing the output shaft 40, and the groove 23 has two blocking portions 24 protruding inwardly. In one embodiment, the cross-section of one end of the striking block 20 disposed at the groove 23 is circular, and the groove 23 is opened along the circumferential direction, and the two blocking portions 24 are located on both sides of the same diameter of the circle. The diameter length of the groove 23 is equal to or slightly greater than the length of the convex plate 41. The convex plate 41 is inserted into the groove 23. When the driving mechanism drives the striking block 20 to rotate to a certain position, the two ends of the convex plate 41 respectively abut against different blocking portions 24, and the striking block 20 thus drives the output shaft 40 to rotate.

[0041] The driving mechanism includes a driving motor 32 and a transmission shaft 31. The driving motor 32 drives the transmission shaft 31 to rotate, thereby driving the striking block 20 to rotate. The striking block 20 is provided with a second through hole 26, and the transmission shaft 31 is inserted into the second through hole 26. The transmission shaft 31 is provided with a first chute 311 on the side wall along its own circumference, and the striking block 20 is provided with a second chute 25 in cooperation. A steel ball 60 is provided in the first chute 311 and the second chute 25, and the diameter of the steel ball 60 is at least greater than the depth of the first chute 311. When the transmission shaft 31 rotates, the first chute 311, the steel ball 60 and the second chute 25 produce relative displacement. After the steel ball 60 moves to the ends of the first chute 311 and the second chute 25, the transmission shaft 31 and the striking block 20 form a hard connection, and the striking block 20 rotates under the drive of the transmission shaft 31.

[0042] Furthermore, two first slide grooves 311 and two second slide grooves 25 are respectively provided, and a steel ball 60 is provided in each pair of first slide grooves 311 and second slide grooves 25 to improve the stability during operation. The second slide groove 25 is provided at the bottom of the groove 23, and the two second slide grooves 25 surround the outer periphery of the second through hole 26 along the axial direction.

[0043] like Figure 7 As shown, the second slide groove 25 has a structure that is deep in the middle and shallow at both ends in the axial direction of the striking block 20, that is, the depth of the middle position in the axial direction of the striking block 20 is greater than the depth of the two ends in the axial direction of the striking block 20. Therefore, the striking block 20 has a reset position, that is, after a single work is completed, the steel ball 60 moves to the middle position of the second slide groove 25, and moves to the end of one end of the second slide groove 25 during work.

[0044] Further, the minimum depth of the second chute 25 is greater than the diameter of the steel ball 60, that is, the depth of the two ends of the second chute 25 in the axial direction of the striking block 20 is greater than the diameter of the steel ball 60. In the working state, the output shaft 40 drives the striking block 20 to move backward. During the movement, the steel ball 60 abuts against the first chute 311 and the end position of the second chute 25, and also moves in the first chute 311 along the axial direction of the striking block 20. Therefore, the depth of the two ends of the second chute 25 in the axial direction of the striking block 20 limits the moving distance of the striking block 20. It should be understood that the second chute 25 limits the moving distance of the striking block 20, but the actual moving process is still completed by the output shaft 40 and the spring 50.

[0045] like Figure 4 and 7 As shown, an arc-shaped third slide groove 27 is also provided at the bottom of the groove 23, which is correspondingly arranged at the middle position of the second slide groove 25 and connected to the second slide groove 25. The steel ball 60 can slide into the second slide groove 25 and the first slide groove 311 through the third slide groove 27, so that the transmission shaft 31 does not need to move too much distance to put in or take out the steel ball 60, and has high flexibility.

[0046] like Figure 4 As shown, a mass portion 28 protrudes from one end of the striking block 20 toward the output shaft 40, which surrounds the edge of the striking block 20 and forms a groove 23 with the end surface of the striking block 20. The first through hole 21 is opened at the bottom of the groove 23, in the middle position between the two blocking portions 24. During the operation of the power tool 100, the convex plate 41 always abuts against the blocking portion 24, and does not form a block to the first through hole 21, so it will not affect the effect of the first through hole 21, and the air on both sides of the striking block 20 can move freely through the first through hole 21.

[0047] Or Figure 5 As shown, the first through hole 21 can also be opened on the blocking portion 24, and one end of the first through hole 21 is connected to the end surface of the blocking portion 24 away from the striking block 20. After the hole is opened, the stress on the blocking portion 24 can be reduced, and the blocking portion 24 will not break when it is frequently hit by the convex plate 41, thereby improving stability and service life.

[0048] In addition to the transmission shaft 31, the driving mechanism also includes other common components such as planetary gears, which will not be described in detail here.

[0049] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0050] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An electric tool, characterized in that: include: A tool housing (10) having a striking chamber (11) formed therein; A striking block (20) is disposed in the striking cavity (11) and is capable of limited forward and backward movement in the striking cavity (11), and a first through hole (21) is formed on the striking block (20) and penetrates along its moving direction; a driving mechanism, disposed on one side of the striking chamber (11), connected to and driving the striking block (20) to rotate; and An output shaft (40) is arranged on the other side of the striking cavity (11) and at least partially exposed from the tool housing (10); the output shaft (40) is connected to the striking block (20) and rotates with the striking block (20).

2. The electric tool according to claim 1, characterized in that: The striking block (20) is provided with a plurality of first through holes (21), and the plurality of first through holes (21) are symmetrically distributed on the striking block (20).

3. The electric tool according to claim 1, characterized in that: An annular groove (22) is recessed on one side of the striking block (20) facing the driving mechanism, and one end of the first through hole (21) is in communication with the annular groove (22).

4. The electric tool according to claim 3, characterized in that: The first through hole (21) is arranged parallel to the rotation axis of the striking block (20).

5. The electric tool according to claim 3, characterized in that: The axis of the first through hole (21) intersects with the rotation axis of the striking block (20), and the distance from the first through hole (21) to the rotation axis of the striking block (20) increases in a direction toward the output shaft (40).

6. The electric tool according to claim 1, characterized in that: A blocking portion (24) is also protruding from one end of the striking block (20) close to the output shaft (40), and the other end of the first through hole (21) is connected to the end surface of the blocking portion (24) away from the striking block (20).

7. The electric tool according to claim 1, characterized in that: A mass portion (28) is also protruding from one end of the striking block (20) close to the output shaft (40); the mass portion (28) and the end surface of the striking block (20) are combined to form a groove (23); and the other end of the first through hole (21) is arranged on the bottom surface of the groove (23).

8. The electric tool according to claim 1, characterized in that: An annular gap is provided between the striking block (20) and the tool housing (10), and the gap is greater than 0.8 mm and less than 2.5 mm.

9. The electric tool according to claim 1, characterized in that: The first through hole (21) is a circular hole.

10. The electric tool according to claim 9, characterized in that: The diameter of the first through hole (21) ranges from 1.5 mm to 4 mm.

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