Electric wrench structure stable in transmission

Abstract

The utility model discloses an electric wrench structure stable in transmission, and relates to the technical field of electric wrenches, the electric wrench structure comprises a base, an electric wrench body, a motor assembly, a planetary gear assembly and a striking block assembly, and the motor assembly, the planetary gear assembly and the striking block assembly are installed in the electric wrench body; the planetary gear assembly is arranged between the motor assembly and the striking block assembly and comprises a gear ring and an installation shell, one end of the installation shell is connected with an outer shell of the motor assembly, the gear ring is arranged at the end, away from the gear ring, of the installation shell, and a lubricating mechanism is installed on the outer surface of the gear ring; through cooperation of the structure, the planetary gear assembly can be continuously lubricated without disassembling the electric wrench body, the lubricating effect of the electric wrench body is improved, and then the stability of the planetary gear assembly during transmission is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of electric wrenches, in particular to an electric wrench structure with stable transmission. Background Art

[0002] Electric wrench generally refers to electric wrench, which is a tool for tightening high-strength bolts. It is used for the initial tightening and final tightening of large hexagonal high-strength bolts installed in steel structure bridges, factory buildings, chemical industry, power generation equipment, and the initial tightening of torsion shear type high-strength bolts, as well as occasions with strict requirements on the torque or axial force of bolt fasteners.

[0003] The planetary gear assembly inside the electric wrench is related to the stability of the internal transmission of the electric wrench. When the friction of the planetary gear is too large during the transmission process, it will have an adverse effect on its transmission. Therefore, it is necessary to apply lubricating oil on the planetary gear to lubricate it, thereby reducing the friction between the gears. This can reduce gear wear and improve transmission efficiency and stability.

[0004] Referring to the utility model with announcement number CN205600600U, a transmission structure of an electric wrench is disclosed, including a rotatable center shaft and an output shaft, a striking block is connected to the center shaft, a horizontal foot is fixedly provided at the end of the output shaft, the striking block can contact the horizontal foot and drive the output shaft to rotate, and is characterized in that a mounting disc is fixedly provided on the center shaft, and three gear grooves radially inward along the mounting disc are opened on the outer circumferential surface, the three gear grooves are evenly spaced, a planetary gear is provided in each gear groove, and a gear ring is also sleeved on the mounting disc, and the inner side wall of the gear ring has teeth meshing with the three planetary gears; the transmission structure also includes a driving shaft capable of driving the center shaft to rotate, and the driving shaft is provided with a sun gear meshing with the three planetary gears.

[0005] In the process of implementing this application, it was found that the technology has the following problems: in the above patent documents, although the planetary gear assembly can be used to complete the transmission function, it lacks a corresponding lubrication mechanism. During long-term use, the planetary gears may cause wear due to long-term friction. Therefore, when adding lubricating oil to the planetary gear assembly, the housing needs to be opened and the lubricating oil needs to be added to the required position. After the lubricating oil is added, the housing needs to be reassembled and fixed; opening and reassembling the housing is time-consuming; secondly, when the housing is opened, when the parts of the planetary gear assembly in the housing are not fixed tightly, they are easy to be lost due to scattering, which will affect the overall transmission effect.

[0006] Therefore, an electric wrench structure with stable transmission is proposed. Utility Model Content

[0007] The purpose of the utility model is to provide an electric wrench structure with stable transmission in order to continuously lubricate the planetary gear assembly without disassembling the electric wrench body, thereby improving the lubrication effect of the electric wrench body and further improving the stability of the planetary gear assembly during transmission.

[0008] The technical solution adopted by the utility model is as follows:

[0009] An electric wrench structure with stable transmission, comprising a base, an electric wrench body, a motor assembly, a planetary gear assembly and a striking block assembly, wherein the motor assembly, the planetary gear assembly and the striking block assembly are mounted inside the electric wrench body, and the planetary gear assembly is arranged between the motor assembly and the striking block assembly, the planetary gear assembly comprises a gear ring and a mounting shell, one end of the mounting shell is connected to an outer shell of the motor assembly, the gear ring is arranged at an end of the mounting shell away from the gear ring, and a lubrication mechanism is installed on the outer surface of the gear ring;

[0010] The lubrication mechanism includes a lubrication circle, which is fixedly connected to the outer surface of the gear ring. An annular oil channel is opened inside the lubrication circle. A through hole is opened on the inner wall of the annular oil channel close to the gear ring. A sponge layer is filled on the side of the annular oil channel close to the through hole. A plurality of steel balls are arranged between a side of the sponge layer away from the through hole and the inner wall of the annular oil channel.

[0011] Furthermore, the base is fixedly connected to the lower surface of the electric wrench body.

[0012] Furthermore, a refueling port is installed on the upper surface of the electric wrench body.

[0013] Furthermore, a connecting pipe is installed on the outer surface of the lubrication circle, the inner cavity at the bottom end of the connecting pipe is connected to the annular oil channel, and the inner cavity at the upper end of the connecting pipe is connected to the oil filling port.

[0014] Furthermore, the number of the through holes is several, and the opening of one end of the through hole away from the annular oil passage is close to the inner wall teeth of the gear ring.

[0015] Furthermore, a filter screen is fixedly connected to an inner side wall of one end of the through hole close to the annular oil channel.

[0016] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0017] In the utility model, when it is necessary to lubricate the planetary gear assembly inside the electric wrench body, lubricating oil can be added to the annular oil channel, and the lubricating oil entering the annular oil channel will slowly soak the sponge layer, and part of the lubricating oil that overflows can lubricate the teeth of the ring gear and the teeth of the planetary gears inside the planetary gear assembly through the through holes; at the same time, the electric wrench body can be shaken to make the steel balls inside the annular oil channel impact and squeeze the sponge layer, so that some lubricating oil inside the sponge layer can pass through the through holes to lubricate the teeth of the ring gear and the teeth of the planetary gears inside the planetary gear assembly; through the cooperation of the above structure, the planetary gear assembly can be continuously lubricated without disassembling the electric wrench body, thereby improving the lubrication effect of the electric wrench body and further improving the stability of the planetary gear assembly during transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 It is a schematic diagram of the structure of the motor assembly, planetary gear assembly, lubrication mechanism and striking block assembly of the utility model;

[0020] Figure 3 It is a cross-sectional view of the lubrication mechanism in the utility model;

[0021] Figure 4 For the utility model Figure 3 Enlarged view of point A.

[0022] Markings in the figure: 1-base, 2-electric wrench body, 3-motor assembly, 4-planetary gear assembly, 5-lubrication mechanism, 6-strike block assembly, 21-fuel filling port, 41-gear ring, 42-mounting shell, 51-lubrication circle, 52-annular oil channel, 53-through hole, 54-filter screen, 55-sponge layer, 56-steel ball, 57-connecting pipe. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution in the embodiments of the utility model will be clearly and completely described below in combination with the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of 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. Example 1

[0024] Reference Figure 1-Figure 4, an electric wrench structure with stable transmission, comprising a base 1, an electric wrench body 2, a motor assembly 3, a planetary gear assembly 4 and a striking block assembly 6, wherein the base 1 is fixedly connected to the lower surface of the electric wrench body 2, the motor assembly 3, the planetary gear assembly 4 and the striking block assembly 6 are installed inside the electric wrench body 2, and the planetary gear assembly 4 is arranged between the motor assembly 3 and the striking block assembly 6, the planetary gear assembly 4 comprises a ring gear 41 and a mounting shell 42, one end of the mounting shell 42 is connected to the outer shell of the motor assembly 3, the ring gear 41 is arranged at one end of the mounting shell 42 away from the ring gear 41, and a lubrication mechanism 5 is installed on the outer surface of the ring gear 41; the lubrication mechanism 5 comprises A lubrication circle 51 is fixedly connected to the outer surface of the gear ring 41, an annular oil passage 52 is opened inside the lubrication circle 51, a refueling port 21 is installed on the upper surface of the electric wrench body 2, a connecting pipe 57 is installed on the outer surface of the lubrication circle 51, the inner cavity at the bottom end of the connecting pipe 57 is connected to the annular oil passage 52, and the inner cavity at the upper end of the connecting pipe 57 is connected to the refueling port 21; specifically, when it is necessary to lubricate the planetary gear assembly 4 inside the electric wrench body 2, lubricating oil can be added to the annular oil passage 52 through the refueling port 21, and the lubricating oil entering the refueling port 21 can flow into the annular oil passage 52 along the connecting pipe 57.

[0025] Reference Figure 1-Figure 4 A through hole 53 is formed on the inner wall of the annular oil passage 52 on one side close to the ring gear 41, and a sponge layer 55 is filled on the side of the annular oil passage 52 close to the through hole 53; specifically, the lubricating oil entering the annular oil passage 52 will slowly soak the sponge layer 55, and part of the lubricating oil that overflows can lubricate the teeth of the ring gear 41 and the teeth of the planetary gears inside the planetary gear assembly 4 through the through hole 53.

[0026] Reference Figure 1-Figure 4 , a plurality of steel balls 56 are arranged between a side of the sponge layer 55 away from the through hole 53 and the inner wall of the annular oil passage 52; a filter screen 54 is fixedly connected to the inner wall of one end of the through hole 53 close to the annular oil passage 52, the number of the through holes 53 is several, and the inner wall teeth of the ring gear 41 are close to the opening of the end of the through hole 53 away from the annular oil passage 52; specifically, the electric wrench body 2 can be shaken at the same time to make the steel balls 56 inside the annular oil passage 52 impact and squeeze the sponge layer 55, so that some lubricating oil inside the sponge layer 55 can pass through the through hole 53 to lubricate the teeth of the ring gear 41 and the planetary gear teeth inside the planetary gear assembly 4; through the cooperation of the above structure, the planetary gear assembly 4 can be continuously lubricated without disassembling the electric wrench body 2, thereby improving the lubrication effect of the electric wrench body 2 and thereby improving the stability of the planetary gear assembly 4 during transmission.

[0027] The implementation principle of the electric wrench structure embodiment with stable transmission in the present application is as follows:

[0028] When using the device, first connect to an external power source. When it is necessary to lubricate the planetary gear assembly 4 inside the electric wrench body 2, lubricating oil can be added to the annular oil passage 52 through the oil filling port 21 and the connecting pipe 57. The lubricating oil entering the annular oil passage 52 will slowly soak the sponge layer 55, and some of the lubricating oil that overflows can lubricate the teeth of the ring gear 41 and the teeth of the planetary gears inside the planetary gear assembly 4 through the through hole 53; at the same time, the electric wrench body 2 can be shaken to make the steel ball 56 inside the annular oil passage 52 impact and squeeze the sponge layer 55, so that some of the lubricating oil inside the sponge layer 55 can pass through the through hole 53 to lubricate the teeth of the ring gear 41 and the teeth of the planetary gears inside the planetary gear assembly 4; through the cooperation of the above structure, the planetary gear assembly 4 can be continuously lubricated without disassembling the electric wrench body 2, thereby improving the lubrication effect of the electric wrench body 2 and further improving the stability of the planetary gear assembly 4 during transmission.

[0029] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An electric wrench structure with stable transmission, comprising a base (1), an electric wrench body (2), a motor assembly (3), a planetary gear assembly (4) and a striking block assembly (6), characterized in that: The motor assembly (3), the planetary gear assembly (4) and the striking block assembly (6) are installed inside the electric wrench body (2), and the planetary gear assembly (4) is arranged between the motor assembly (3) and the striking block assembly (6); the planetary gear assembly (4) comprises a ring gear (41) and a mounting shell (42); one end of the mounting shell (42) is connected to the outer shell of the motor assembly (3); the ring gear (41) is arranged at an end of the mounting shell (42) away from the ring gear (41); and a lubrication mechanism (5) is installed on the outer surface of the ring gear (41); The lubricating mechanism (5) comprises a lubricating circle (51), the lubricating circle (51) being fixedly connected to the outer surface of the gear ring (41), an annular oil passage (52) being provided inside the lubricating circle (51), a through hole (53) being provided on an inner wall of a side of the annular oil passage (52) close to the gear ring (41), a sponge layer (55) being filled on a side of the annular oil passage (52) close to the through hole (53), and a plurality of steel balls (56) being provided between a side of the sponge layer (55) away from the through hole (53) and an inner wall of the annular oil passage (52).

2. The electric wrench structure with stable transmission as claimed in claim 1, characterized in that: The base (1) is fixedly connected to the lower surface of the electric wrench body (2).

3. The electric wrench structure with stable transmission as claimed in claim 1, characterized in that: A refueling port (21) is installed on the upper surface of the electric wrench body (2).

4. The electric wrench structure with stable transmission as claimed in claim 3, characterized in that: A connecting pipe (57) is installed on the outer surface of the lubrication circle (51); the internal cavity at the bottom end of the connecting pipe (57) is connected to the annular oil passage (52); and the internal cavity at the upper end of the connecting pipe (57) is connected to the oil filling port (21).

5. The electric wrench structure with stable transmission as claimed in claim 1, characterized in that: The number of the through holes (53) is several, and the opening of one end of the through hole (53) away from the annular oil passage (52) is close to the inner wall teeth of the gear ring (41).

6. The electric wrench structure with stable transmission as claimed in claim 1, characterized in that: A filter screen (54) is fixedly connected to the inner side wall of one end of the through hole (53) close to the annular oil channel (52).

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