An output shaft sealing structure of an electric wrench

Abstract

The utility model discloses an output shaft sealing structure of an electric wrench, and relates to the technical field of output shaft sealing structures of electric wrenches. The utility model comprises a front housing, an output shaft and a rear housing, wherein the front housing and the rear housing are specifically an integrated structure formed by welding connection, an output shaft through hole is provided in a through-type manner on the central surface of one end of the front housing away from the rear housing, the output shaft is through-installed in the inside of the output shaft through hole, an outer shaft sleeve plate is fixedly sleeved around the outer surface of the output shaft located at the output shaft through hole, a double-lip sealing ring for sealing is fitted and connected between the inner wall of the output shaft through hole and the outer surface of the output shaft, and the double-lip sealing ring is in an inwardly recessed double-lip sealing design on both sides of the outer shaft sleeve plate, and the two side surfaces of the double-lip sealing ring are respectively fitted and flush with the two sides of the output shaft through hole, and a group of symmetrical outer arc grooves are provided inwardly on both sides of the surface of one end of the front housing away from the rear housing, so as to improve and strengthen the sealing effect.

Description

Technical Field

[0001] The utility model relates to the technical field of electric wrench output shaft sealing structure, in particular to an electric wrench output shaft sealing structure. Background Art

[0002] An electric wrench is an electric tool for tightening and loosening bolts and nuts. It is a tool for tightening high-strength bolts. It is used for the initial tightening, final tightening, and initial tightening of torsion shear type high-strength bolts in the construction of steel structure bridges, factory buildings, chemical industry, and power generation equipment, as well as occasions with strict requirements on the torque or axial force of bolt fasteners. The principle is that when the end face of the nut contacts the end face of the workpiece, the resistance torque rises sharply, and the rotating spiral groove causes the ball to move backward with the active impact block to overcome the friction and the pressure of the working spring, so that the teeth of the active impact block and the driven impact block that are meshed with each other are disengaged. At this time, the driven impact block does not move, while the active impact block continues to move backward. After turning the teeth of the driven impact block, the active impact block moves forward instantaneously due to the action of the working spring, and generates an angular acceleration along the spiral groove. The active impact block hits the driven impact block, and the two teeth collide. Then the spiral groove causes the ball and the active impact block to move backward and disengage. This cycle produces collisions again and again, obtaining the required impact torque and tightening the nut.

[0003] The output shaft of the electric wrench is a shaft connecting the motor and the wrench head, which is responsible for transmitting the rotational force of the motor to the wrench head so that it can complete the rotation. According to the requirements of industrial tools, the output shaft of the electric wrench needs to have the characteristics of high strength, good wear resistance and corrosion resistance.

[0004] The output shaft of the electric wrench, in addition to having the characteristics of high strength, good wear resistance, and corrosion resistance, must also pay attention to the sealing of the output shaft of the electric wrench. Most of the existing sealing structures use O-rings or skeleton oil seals to seal the output shaft, but the above-mentioned sealing rings, such as O-rings, need to be sealed separately on both sides of the output shaft for sealing. Although a sealing effect is provided on both sides of the output shaft, there is still a gap in the middle, and the sealing connection relationship is not strong, which weakens the sealing effect of the sealing structure. Summary of the invention

[0005] The utility model aims to provide an output shaft sealing structure of an electric wrench, which solves the technical problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an electric wrench output shaft sealing structure, comprising a front housing, an output shaft and a rear housing, the front housing and the rear housing are specifically an integrated structure formed by welding connection, an output shaft through hole is penetrated through the center surface of one end of the front housing away from the rear housing, the output shaft is through-installed inside the output shaft through hole, the output shaft is located on the outer surface of the output shaft through hole and an outer shaft sleeve plate is fixedly sleeved around it, a double-lip sealing ring for sealing is fitted between the inner wall of the output shaft through hole and the outer surface of the output shaft, and the double-lip sealing ring is inwardly recessed double-lip sealing design on both sides of the outer shaft sleeve plate, and the two side surfaces of the double-lip sealing ring are respectively fitted and flush with the two sides of the output shaft through hole.

[0007] Optionally, a group of symmetrical outer arc grooves are formed inwardly on both sides of the front shell surface away from one end of the rear shell.

[0008] Optionally, a concave arc circle is provided inwardly on a peripheral surface of the front shell body away from the outer arc groove.

[0009] Optionally, a group of symmetrical triangular arc grooves are formed inwardly on both sides of the rear shell surface away from one end of the front shell.

[0010] Optionally, a group of symmetrical fixed connecting plates are respectively connected to the upper and lower end surfaces of the rear shell body close to the triangular arc groove, and a connecting groove is opened inward on one side surface of the fixed connecting plate. The two groups of fixed connecting plates are specifically arranged in pairs and are connected and distributed at the four corners of the rear shell body.

[0011] Optionally, a vertically designed connecting slot plate is fixedly connected to the central lower surface of the rear shell.

[0012] Optionally, a straight-line card rotating plate for driving a driving component is fixedly connected to the rear end surface of the output shaft close to the rear shell.

[0013] Optionally, an annular groove is formed around the inner wall surface of the output shaft through hole of the front shell, and an anti-impact washer for protecting the straight-line card rotating plate from impact is fitted in the annular groove.

[0014] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0015] The utility model adopts the design of a double-lip sealing ring, which effectively strengthens the sealing performance of the double-lip sealing ring on the output shaft by means of a double-lip sealing method with recessed lips on both sides. The double-lip sealing ring is an integrated sealing structure, which not only ensures the integrated connection relationship of the sealing structure, but also further improves and strengthens the sealing effect of the sealing structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is the front view of the structure of the utility model;

[0017] Figure 2 It is a front view of the structure of the utility model;

[0018] Figure 3 It is a rear view of the structure of the utility model;

[0019] Figure 4 It is a front cross-sectional view of the structure of the utility model.

[0020] In the figure: 1-front housing, 2-rear housing, 3-output shaft through hole, 4-concave arc circle, 5-outer arc groove, 6-triangular arc groove, 7-connecting groove plate, 8-fixed connecting plate, 9-connecting notch, 10-double lip sealing ring, 11-output shaft, 12-outer shaft sleeve plate, 13-slotted card rotating plate, 14-ring groove, 15-anti-impact buffer washer. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] For example, see Figures 1 to 4 The utility model provides a technical solution: an electric wrench output shaft sealing structure, comprising a front housing 1, an output shaft 11 and a rear housing 2, the front housing 1 and the rear housing 2 are specifically an integrated structure formed by welding connection, an output shaft through hole 3 is penetrated on the central surface of one end of the front housing 1 away from the rear housing 2, the output shaft 11 is penetrated and installed inside the output shaft through hole 3, the output shaft 11 is located on the outer surface of the output shaft through hole 3 and an outer shaft sleeve plate 12 is fixedly sleeved around the output shaft 11, a double-lip sealing ring 10 for sealing is fitted and connected between the inner wall of the output shaft through hole 3 and the outer surface of the output shaft 11, and the double-lip sealing ring 10 is inwardly recessed on both sides of the outer shaft sleeve plate 12, and the two side surfaces of the double-lip sealing ring 10 are respectively fitted and flush with the two sides of the output shaft through hole 3.

[0023] More specifically, in this embodiment, a double-lip sealing ring 10 is used to fit between the inner wall of the output shaft through hole 3 and the outer surface of the output shaft 11, and the sealing method of the double-lip sealing ring 10 with recessed double lips on both sides is effectively used to strengthen the sealing performance of the double-lip sealing ring 10 on the output shaft 11 and the outer shaft sleeve plate 12. The double-lip sealing ring 10 is an integrated sealing structure, which not only ensures the integrated connection relationship of the sealing structure, but also further improves and strengthens the sealing effect of the sealing structure.

[0024] Furthermore, a group of symmetrical outer arc grooves 5 are opened inwardly on both sides of the front shell body 1 away from the end surface of the rear shell body 2, a concave arc circle 4 is opened inwardly on a peripheral surface of the front shell body 1 away from the outer arc groove 5, and a group of symmetrical triangular arc grooves 6 are opened inwardly on both sides of the rear shell body 2 away from the end surface of the front shell body 1.

[0025] It is worth mentioning that the outer arc groove 5 and the concave arc circle 4 of the front shell 1, and the triangular arc groove 6 of the rear shell 2 will facilitate the operator to take and disassemble the front shell 1 and the rear shell 2 from various angles and directions. In addition, the arc grooves of the outer arc groove 5, the concave arc circle 4 and the triangular arc groove 6 are more convenient for the operator to hold, and will not scratch the operator's hands, thereby improving the operator's use effect.

[0026] Embodiment 2, based on the above embodiment:

[0027] Furthermore, a group of symmetrical fixed connecting plates 8 are respectively connected to the upper and lower end surfaces of the rear shell body 2 near the triangular arc groove 6, and a connecting groove 9 is opened inward on one side surface of the fixed connecting plate 8. The two groups of fixed connecting plates 8 are specifically arranged in groups of two and are connected and distributed at the four corners of the rear shell body 2. The central lower surface of the rear shell body 2 is fixedly connected to a connecting groove plate 7 with a vertical design.

[0028] More specifically, in this embodiment, the operator can install and remove other components of the electric wrench by fixing the connection notch 9 of the connection plate 8 and the connection slot plate 7 .

[0029] Furthermore, a straight-line card rotating plate 13 for driving the driving component is fixedly connected to the rear end surface of the output shaft 11 near the rear shell 2, and an annular groove 14 is opened around the inner wall surface of the output shaft through hole 3 of the front shell 1, and an anti-impact washer 15 is fitted in the annular groove 14 for protecting the straight-line card rotating plate 13 from impact.

[0030] It is worth mentioning that the slotted card rotating plate 13 is connected to the driving component of the electric wrench, and under the drive of the driving component, the slotted card rotating plate 13 drives the output shaft 11 to drive the electric wrench to rotate. During the process of the slotted card rotating plate 13 being driven, the anti-impact buffer washer 15 in the annular groove 14 can provide anti-impact protection for the slotted card rotating plate 13.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An electric wrench output shaft sealing structure, comprising a front housing (1), an output shaft (11) and a rear housing (2), characterized in that: The front housing (1) and the rear housing (2) are specifically an integrated structure formed by welding connection. An output shaft through hole (3) is provided in a through-opening manner on the central surface of one end of the front housing (1) away from the rear housing (2). The output shaft (11) is installed in a through-opening manner inside the output shaft through hole (3). An outer shaft sleeve (12) is fixedly sleeved around the outer surface of the output shaft (11) located at the output shaft through hole (3). A double-lip sealing ring (10) for sealing is fitted between the inner wall of the output shaft through hole (3) and the outer surface of the output shaft (11). The double-lip sealing ring (10) is designed as an inwardly recessed double-lip sealing on both sides of the outer shaft sleeve (12). The two side surfaces of the double-lip sealing ring (10) are respectively fitted and flush with the two sides of the output shaft through hole (3).

2. The electric wrench output shaft sealing structure according to claim 1, characterized in that: A group of symmetrical outer arc grooves (5) are provided inwardly on both sides of the surface of one end of the front shell (1) away from the rear shell (2).

3. The electric wrench output shaft sealing structure according to claim 2, characterized in that: A concave arc circle (4) is formed inwardly on a peripheral surface of the front housing (1) on a side away from the outer arc groove (5).

4. The electric wrench output shaft sealing structure according to claim 3, characterized in that: A group of symmetrical triangular arc grooves (6) are provided inwardly on both sides of the surface of one end of the rear shell (2) away from the front shell (1).

5. The electric wrench output shaft sealing structure according to claim 4, characterized in that: A group of symmetrical fixed connection plates (8) are respectively connected to the upper and lower end surfaces of the rear shell (2) close to the triangular arc groove (6); a connection notch (9) is provided inwardly on one side surface of the fixed connection plate (8); the two groups of fixed connection plates (8) are specifically arranged in pairs and are connected and distributed at the four corners of the rear shell (2).

6. The electric wrench output shaft sealing structure according to claim 5, characterized in that: A vertically designed connecting slot plate (7) is fixedly connected to the central lower surface of the rear housing (2).

7. The electric wrench output shaft sealing structure according to claim 1, characterized in that: A straight-edge card rotating plate (13) for driving a driving component is fixedly connected to a rear end surface of the output shaft (11) close to the rear housing (2).

8. The electric wrench output shaft sealing structure according to claim 7, characterized in that: The front housing (1) is provided with an annular groove (14) around the inner wall surface of the output shaft through hole (3), and an anti-impact washer (15) for protecting the straight-shaped card rotating plate (13) from impact is fitted in the annular groove (14).

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