Sealing structure for electric tool

Abstract

The utility model discloses a sealing structure for an electric tool, which comprises a shell, an electric motor and a gear box component are arranged in the shell, the electric motor is connected with the gear box component, and an output shaft rotationally connected with the shell is arranged at the head of the shell; the gearbox assembly is arranged between the electric motor and the output shaft, and when the gearbox assembly is driven by the electric motor to rotate, the output shaft rotates relative to the shell. A middle cover body fixedly connected with the shell is arranged in the shell, and a gearbox assembly is installed in the middle cover body. The gearbox assembly comprises a hollow cavity, a sealing assembly is arranged in the middle cover body, and the sealing assembly is arranged between the hollow cavity and the electric motor. The sealing assembly is arranged between the electric motor and the gear box assembly, free diffusion of reduction gearbox oil is avoided, the sealing effect is good, and use is safe and reliable.

Description

Technical Field

[0001] The utility model belongs to the technical field of electric tools, and in particular relates to a sealing structure for electric tools. Background Art

[0002] A wrench is a commonly used electric tool. A reduction gear assembly and a drive motor are often provided in the housing of the wrench, and reduction gear oil is often added to the reduction gear assembly. The existing patent document with publication number CN219704922U discloses a striking assembly for an electric wrench, comprising a head shell, an intermediate cover, and an output shaft. A transmission shaft is provided between the head shell and the intermediate cover, a striking block is provided at the end of the transmission shaft, and an elastic member is provided between the striking block and the intermediate cover; a two-stage reduction transmission mechanism is provided at the bottom of the intermediate cover, and the two-stage reduction transmission mechanism comprises a first-stage planetary gear assembly, a second-stage planetary gear assembly, an inner gear ring, and a reduction motor. The first-stage planetary gear assembly and the second-stage planetary gear assembly are arranged in the inner gear ring, the first-stage planetary gear assembly is connected to the reduction motor, and the second-stage planetary gear assembly is connected to the transmission shaft; a limit assembly is provided between the output shaft and the head shell, the limit assembly comprises a first gasket and a shaft sleeve, and the shaft sleeve is arranged between the output shaft and the head shell. Existing wrenches often lack a sealing mechanism between the reduction motor and the secondary reduction transmission mechanism. This causes the reduction gearbox oil in the secondary reduction transmission mechanism to flow into the reduction motor. Over time, the reduction motor is affected by the reduction gearbox oil, causing the wrench to malfunction. Therefore, a sealing structure for power tools is needed to overcome this problem. Summary of the Invention

[0003] In view of the problems existing in the prior art, the utility model designs a sealing structure for an electric tool. The utility model arranges a sealing component between the electric motor and the gear box component to prevent the reduction box oil from spreading arbitrarily, has a good sealing effect, and is safe and reliable to use.

[0004] The invention objective of the utility model is achieved through the following technical solutions: A sealing structure for an electric tool, comprising a shell, an electric motor and a gear box assembly are arranged in the shell, the electric motor and the gear box assembly are connected, and the head of the shell is provided with an output shaft rotatably connected thereto; the gear box assembly is arranged between the electric motor and the output shaft, and when the electric motor drives the gear box assembly to rotate, the output shaft rotates relative to the shell; an intermediate cover body is provided in the shell fixedly connected thereto, and the gear box assembly is installed in the intermediate cover body; the gear box assembly includes a hollow cavity, a sealing assembly is provided in the intermediate cover body, and the sealing assembly is arranged between the hollow cavity and the electric motor.

[0005] Preferably, the gearbox assembly also includes a transmission shaft, which is connected to the output shaft, and the output shaft rotates relative to the housing when the electric motor drives the transmission shaft to rotate; a hollow cavity is provided in the base of the transmission shaft, and the motor shaft of the electric motor is mounted on the planetary gear of the gearbox assembly, and the motor shaft of the electric motor extends into the interior of the hollow cavity; a first bearing connecting the motor shaft of the electric motor and the intermediate cover body is provided between the two, and a sealing assembly is provided in the intermediate cover body.

[0006] Preferably, the sealing assembly includes a wool washer, a compression washer and an elastic retaining ring; the wool washer, the compression washer and the elastic retaining ring are installed in sequence on the middle cover body, the wool washer is arranged adjacent to the hollow cavity, the compression washer and the wool washer are arranged adjacent to each other, and the elastic retaining ring is arranged adjacent to the compression washer.

[0007] Preferably, the middle cover body is provided with a first card slot, a second card slot and a limiting groove in sequence; a wool washer is provided in the first card slot, a compression washer is provided in the second card slot, and an elastic retaining ring is provided in the limiting groove.

[0008] Preferably, the wool washer and the compression washer are in the shape of hollow discs, and the compression washer has an outer diameter larger than that of the wool washer; the elastic retaining ring is a standard retaining ring, and the outer diameter of the elastic retaining ring is larger than that of the compression washer.

[0009] Preferably, the wool washer is sleeved and mounted on the motor shaft of the electric motor, and the inner diameter of the wool washer is matched with the inner diameter of the motor shaft of the electric motor.

[0010] Preferably, the middle cover body is further provided with a third slot, in which a first bearing is installed.

[0011] Preferably, a sealing ring is provided between the middle cover and the first bearing.

[0012] Compared with the prior art, the present invention has the following advantages: 1. By installing the intermediate cover within the housing, the gearbox assembly can be easily installed within the intermediate cover; the seal assembly is also installed within the intermediate cover, ensuring a secure and stable installation. 2. By installing the seal assembly within the intermediate cover, the seal assembly is positioned between the electric motor and the gearbox assembly, preventing the oil from the reduction gearbox from flowing into the electric motor. The seal assembly includes a wool washer, which provides excellent sealing and is wear-resistant, significantly extending its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a three-dimensional diagram of the utility model;

[0014] Figure 2 This is the internal structure diagram of the utility model;

[0015] Figure 3 for Figure 2 A partial enlarged view of position A in the middle;

[0016] Figure 4 This is the internal structure diagram of the middle cover;

[0017] Markings in the figure: 1. Housing; 2. Electric motor; 3. Gearbox assembly; 31. Hollow cavity; 32. Drive shaft; 4. Output shaft; 5. Intermediate cover; 51. First slot; 52. Second slot; 53. Limiting groove; 54. Third slot; 6. First bearing; 7. Sealing assembly; 71. Wool washer; 72. Compression washer; 73. Elastic retaining ring; 8. Sealing ring. DETAILED DESCRIPTION

[0018] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings:

[0019] like Figures 1 to 4 As shown, this embodiment discloses a sealing structure for an electric tool, including a shell 1, in which an electric motor 2 and a gear box assembly 3 are provided, the electric motor 2 and the gear box assembly 3 are connected, and the head of the shell 1 is provided with an output shaft 4 rotatably connected thereto; the gear box assembly 3 is arranged between the electric motor 2 and the output shaft 4, and when the electric motor 2 drives the gear box assembly 3 to rotate, the output shaft 4 rotates relative to the shell 1; the shell 1 is provided with an intermediate cover body 5 fixedly connected thereto, and the gear box assembly 3 is installed in the intermediate cover body 5; the gear box assembly 3 includes a hollow cavity 31, and the intermediate cover body 5 is provided with a sealing assembly 7, and the sealing assembly 7 is arranged between the hollow cavity 31 and the electric motor 2.

[0020] The gearbox assembly 3 also includes a transmission shaft 32, which is connected to the output shaft 4. When the electric motor 2 drives the transmission shaft 32 to rotate, the output shaft 4 rotates relative to the housing 1. A hollow cavity 31 is provided in the base of the transmission shaft 32. The motor shaft of the electric motor 2 is mounted on the planetary gear of the gearbox assembly 3, and the motor shaft of the electric motor 2 extends into the interior of the hollow cavity 31. A first bearing 6 is provided between the motor shaft of the electric motor 2 and the intermediate cover 5 to connect the two. A sealing assembly 7 is provided in the intermediate cover 5. The sealing assembly 7 includes a wool washer 71, a compression washer 72, and an elastic circlip 73. The wool washer 71, the compression washer 72, and the elastic circlip 73 are sequentially mounted on the intermediate cover 5, the wool washer 71 is arranged adjacent to the hollow cavity 31, the compression washer 72 is arranged adjacent to the wool washer 71, and the elastic circlip 73 is arranged adjacent to the compression washer 72. The middle cover body 5 is provided with a first slot 51, a second slot 52 and a limiting groove 53 in sequence; a wool washer 71 is provided in the first slot 51, a pressure washer 72 is provided in the second slot 52, and an elastic retaining ring 73 is provided in the limiting groove 53. The wool washer 71 and the pressure washer 72 are hollow disc-shaped, and the outer diameter of the pressure washer 72 is larger than that of the wool washer 71; the elastic retaining ring 73 is a standard retaining ring, and the outer diameter of the elastic retaining ring 73 is larger than that of the pressure washer 72. The wool washer 71 is sleeved and installed on the motor shaft of the electric motor 2, and the inner diameter of the wool washer 71 is adapted to the inner diameter of the motor shaft of the electric motor 2. The middle cover body 5 is also provided with a third slot 54, and a first bearing 6 is installed in the third slot 54. A sealing ring 8 is provided between the middle cover body 5 and the first bearing 6.

[0021] The specific operation process of this embodiment is as follows: install the middle cover body 5 on the shell 1, then install the gear box assembly 3 in the middle cover body 5, and evenly add reduction gear oil into the gear box assembly 3; then install the sealing assembly 7 into the middle cover body 5; first install the wool washer 71 on the first slot 51, and then install the clamping washer 72 on the second slot 52; then install the elastic retaining ring 73 in the limiting groove 53, so that the wool washer 71 will be fixed in the middle cover body 5; then install the first bearing 6 in the middle cover body 5, and finally install the motor shaft of the electric motor 2 on the first bearing 6; due to the sealing of the wool washer 71, the reduction gear oil in the hollow cavity 31 cannot spread to the electric motor 2, the sealing effect is good, and the service life of the electric motor 2 is greatly increased.

[0022] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

Claims

1. A sealing structure for an electric tool, comprising a housing (1), an electric motor (2) and a gear box assembly (3) being arranged in the housing (1), characterized in that: The electric motor (2) and the gearbox assembly (3) are connected, and the head of the housing (1) is provided with an output shaft (4) rotatably connected thereto; the gearbox assembly (3) is arranged between the electric motor (2) and the output shaft (4), and when the electric motor (2) drives the gearbox assembly (3) to rotate, the output shaft (4) rotates relative to the housing (1); an intermediate cover (5) fixedly connected thereto is provided in the housing (1), and the gearbox assembly (3) is installed in the intermediate cover (5); the gearbox assembly (3) includes a hollow cavity (31), and a sealing assembly (7) is provided in the intermediate cover (5), and the sealing assembly (7) is arranged between the hollow cavity (31) and the electric motor (2).

2. The sealing structure for an electric tool according to claim 1, wherein: The gearbox assembly (3) further comprises a transmission shaft (32), the transmission shaft (32) being connected to the output shaft (4), and when the electric motor (2) drives the transmission shaft (32) to rotate, the output shaft (4) rotates relative to the housing (1); a hollow cavity (31) is provided in the base of the transmission shaft (32), the motor shaft of the electric motor (2) is mounted on the planetary gear of the gearbox assembly (3), and the motor shaft of the electric motor (2) extends into the interior of the hollow cavity (31); a first bearing (6) is provided between the motor shaft of the electric motor (2) and the intermediate cover (5), and a sealing assembly (7) is provided in the intermediate cover (5).

3. The sealing structure for an electric tool according to claim 2, wherein: The sealing assembly (7) comprises a wool washer (71), a compression washer (72) and an elastic retaining ring (73); the wool washer (71), the compression washer (72) and the elastic retaining ring (73) are sequentially mounted on the middle cover (5), the wool washer (71) is arranged adjacent to the hollow cavity (31), the compression washer (72) and the wool washer (71) are arranged adjacent to each other, and the elastic retaining ring (73) is arranged adjacent to the compression washer (72).

4. The sealing structure for an electric tool according to claim 3, wherein: The middle cover body (5) is provided with a first card slot (51), a second card slot (52) and a limiting groove (53) in sequence; a wool washer (71) is provided in the first card slot (51), a pressing washer (72) is provided in the second card slot (52), and an elastic retaining ring (73) is provided in the limiting groove (53).

5. The sealing structure for an electric tool according to claim 3, wherein: The wool washer (71) and the compression washer (72) are in the shape of hollow discs, and the outer diameter of the compression washer (72) is larger than that of the wool washer (71); the elastic retaining ring (73) is a standard retaining ring, and the outer diameter of the elastic retaining ring (73) is larger than that of the compression washer (72).

6. The sealing structure for an electric tool according to claim 3, wherein: The wool washer (71) is sleeved and mounted on the motor shaft of the electric motor (2), and the inner diameter of the wool washer (71) is adapted to the inner diameter of the motor shaft of the electric motor (2).

7. The sealing structure for an electric tool according to claim 2, wherein: The middle cover body (5) is further provided with a third slot (54), and a first bearing (6) is installed in the third slot (54).

8. The sealing structure for an electric tool according to claim 7, wherein: A sealing ring (8) is provided between the middle cover (5) and the first bearing (6).

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