A torque multiplier for an electric power wrench
By designing a shielding and limiting component, the problems of foreign object jamming and easy loss of fixing post caused by the lack of shielding of the torque multiplier bushing opening of the electric wrench were solved, realizing flexible foreign object protection and support functions.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NORBAR TORQUE TOOLS (SHANGHAI) LTD
- Filing Date
- 2025-08-11
- Publication Date
- 2026-07-31
AI Technical Summary
The torque multiplier of existing electric wrenches lacks a shielding at the bottom bushing opening, which allows foreign objects to get stuck, and the detachable retaining post is easily lost.
Design a torque multiplier including a housing assembly, a torque multiplier assembly, and a shielding and limiting assembly. The shielding and limiting assembly forms a hexagonal bushing shield to prevent foreign objects from entering and can be used as a support component when needed.
It effectively prevents foreign objects from entering and avoids jamming problems. At the same time, the blocking and limiting component can serve as a support after the blocking is removed, improving operational flexibility and making it less likely to be lost.
Smart Images
Figure CN224575551U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of torque multiplier technology, and in particular to a torque multiplier for electric wrenches. Background Technology
[0002] An electric wrench is an electric tool used to tighten and loosen bolts and nuts, while a torque multiplier is a mechanical tool used to amplify torque. It is mainly used in scenarios that require high torque operation. When an electric wrench is used with a torque multiplier, it can output greater torque with less force, which saves the power consumption of the electric wrench, increases its battery life, and allows for precise control of the torque value.
[0003] For example, the utility model patent CN219755289U discloses a torque multiplier for an electric wrench. This design makes the torque multiplier flat, which can be used in areas with limited construction space, avoiding collisions between the electric wrench and other components, thus increasing the range of applications for the electric wrench. However, the two bushing openings at the bottom of the torque multiplier, which are used to connect the bolt and the electric wrench, lack shielding. Therefore, during carrying and storage, foreign objects can easily enter the inside of the bushing through the bushing openings, causing jamming when connecting the bushing to the electric wrench and bolt, affecting its use. In addition, although the detachable fixing post is more flexible, it is easy to lose it.
[0004] Therefore, it is necessary to invent a torque multiplier for electric wrenches to solve the above problems. Utility Model Content
[0005] The purpose of this invention is to provide a torque multiplier for electric wrenches. It utilizes a blocking and limiting component to form a hexagonal bushing, preventing foreign objects from entering and causing jamming when connecting the bolts and the electric wrench. Simultaneously, after releasing the hexagonal bushing's obstruction, the blocking and limiting component also provides support for the housing assembly during subsequent bolt tightening. This makes it more flexible and convenient to use, and avoids the problem of loss due to disassembly. This addresses the issue in the prior art where existing torque multipliers lack obstruction for the two bushing openings at the bottom for connecting the bolts and the electric wrench. Therefore, during carrying and storage, foreign objects easily enter the bushing through the openings, causing jamming when connecting the bushing to the electric wrench and bolts, affecting use. Additionally, while detachable fixing posts offer more flexibility, they are prone to loss.
[0006] According to one aspect of this disclosure, a technical solution is provided as follows: a torque multiplier for an electric wrench, comprising:
[0007] A housing assembly for mounting the torque multiplier assembly and the blocking and limiting assembly;
[0008] A torque multiplier component, said torque multiplier component being used to amplify the torque output by an electric wrench; and
[0009] A blocking and limiting assembly includes two adjustment holes on the top of the top shell and a mounting ring fixedly disposed through the top of the top shell. A sliding shaft is slidably disposed on the inner side of the mounting ring in a vertical direction. A limiting plate is fixedly disposed at the bottom end of the sliding shaft and a knob is fixedly disposed at the top end. Two magnets that attract each other are disposed at the bottom of the limiting plate. One magnet is fixedly connected to the limiting plate and the other magnet is fixedly connected to the bottom shell. A blocking cover plate is fixedly sleeved on the top end of the outer side of the sliding shaft. The blocking cover plate slides against the top of the top shell and blocks the two mounting holes. An adjusting pin is fixedly disposed through the top of the blocking cover plate. The bottom end of the adjusting pin is slidably inserted into the inner side of the adjacent adjustment hole in a vertical direction.
[0010] According to at least one embodiment of the present disclosure, a torque multiplier for an electric wrench includes a housing assembly comprising a bottom housing with an intermediate housing fixedly disposed on top of the bottom housing.
[0011] According to at least one embodiment of the present disclosure, a torque multiplier for an electric wrench has a top shell fixedly disposed on the top of the intermediate shell, and the top shell has two mounting holes.
[0012] According to at least one embodiment of the present disclosure, a torque multiplier for an electric wrench includes two hexagonal bushings rotatably nested inside two mounting holes via bearings. A gear A is fixedly sleeved on the outer side of one of the hexagonal bushings, and a gear B is fixedly sleeved on the outer side of the other gear A. The number of teeth of gear A is less than the number of teeth of gear B.
[0013] According to at least one embodiment of the present disclosure, a torque multiplier for an electric wrench has a gear C meshing between gear A and gear B, and gear C is rotatably nested between a bottom shell and a top shell via a bearing.
[0014] The technical effects and advantages of this utility model are as follows:
[0015] This invention utilizes a blocking and limiting component to form a hexagonal bushing, preventing foreign objects from entering and causing jamming when connecting bolts and electric wrenches. At the same time, after the blocking and limiting component is released from the hexagonal bushing, it can also provide support for the housing component during the subsequent bolt tightening process. In actual use, it is more flexible and convenient, and there will be no problem of loss due to disassembly. Attached Figure Description
[0016] The accompanying drawings illustrate exemplary embodiments of the present disclosure and, together with the description thereof, serve to explain the principles of the present disclosure. These drawings are included to provide a further understanding of the present disclosure and are incorporated in and constitute a part of this specification.
[0017] Figure 1 This is a schematic diagram of the overall structure of a torque multiplier for an electric wrench according to one embodiment of the present disclosure.
[0018] Figure 2 This is a schematic diagram of the housing assembly and torque multiplier assembly of a torque multiplier for an electric wrench according to one embodiment of the present disclosure.
[0019] Figure 3 This is a partial structural schematic diagram of a blocking and limiting assembly for a torque multiplier of an electric wrench according to one embodiment of the present disclosure.
[0020] The specific labels in the attached figures are as follows:
[0021] 1. Housing assembly; 11. Bottom shell; 12. Intermediate shell; 13. Top shell; 14. Mounting holes;
[0022] 2. Torque multiplier assembly; 21. Hexagonal bushing; 22. Gear A; 23. Gear B; 24. Gear C;
[0023] 3. Obstruction and limiting component; 31. Adjustment hole; 32. Mounting collar; 33. Sliding shaft; 34. Limiting plate; 35. Knob; 36. Magnet; 37. Obstruction cover plate; 38. Adjusting pin. Detailed Implementation
[0024] For descriptive purposes, this disclosure may use spatial relative terms such as “below,” “under,” “below,” “down,” “above,” “above,” “higher,” and “side (e.g., in a “sidewall”)” to describe the relationship between one component and another component as shown in the accompanying drawings. In addition to the orientations depicted in the drawings, the spatial relative terms are also intended to encompass different orientations of the device during use, operation, and / or manufacture. For example, if the device in the drawings is flipped, a component described as “below” or “under” other components or features would subsequently be positioned “above” said other components or features. Thus, the exemplary term “below” can encompass both “above” and “below” orientations. Furthermore, the device may be otherwise positioned (e.g., rotated 90 degrees or in other orientations), thus interpreting the spatial relative descriptive terms used herein accordingly.
[0025] Figure 1 This is a schematic diagram of the overall structure of a torque multiplier for an electric wrench according to one embodiment of the present disclosure.
[0026] Figure 2 This is a schematic diagram of the housing assembly 1 and torque multiplier assembly 2 for an electric wrench according to one embodiment of the present disclosure.
[0027] Figure 3 This is a partial structural diagram of the blocking and limiting assembly 3 for a torque multiplier of an electric wrench according to one embodiment of the present disclosure.
[0028] like Figures 1-3 As shown, the torque multiplier for electric wrenches disclosed herein adopts a flat structure design, which can be operated flexibly in narrow spaces (such as engine compartments and pipe interlayers) and avoid collisions with surrounding components. It mainly consists of three parts: housing assembly 1, torque multiplier assembly 2, and shielding and limiting assembly 3. The components work together to achieve torque amplification, foreign object protection, and operation support functions.
[0029] like Figure 2 As shown in this disclosure, the housing assembly 1 includes a bottom shell 11, an intermediate shell 12 fixedly disposed on the top of the bottom shell 11, and a top shell 13 fixedly disposed on the top of the intermediate shell 12. The bottom shell 11, the intermediate shell 12 and the top shell 13 are made of high-strength aluminum alloy (lightweight and strong pressure resistance). The surfaces of the bottom shell 11 and the top shell 13 are both frosted to improve the anti-slip properties when held. Two mounting holes 14 are opened on the top of the top shell 13.
[0030] Therefore, it is convenient to install the two hexagonal bushings 21 using the two mounting holes 14 respectively. At the same time, the overall shape of the bottom shell 11, the middle shell 12 and the top shell 13 is flat, making it convenient to store and take out.
[0031] like Figure 2 As shown, in a preferred embodiment, the torque multiplier component 2 includes two hexagonal bushings 21 that are rotatably nested inside two mounting holes 14 via bearings. A gear A22 is fixedly sleeved on the outside of one hexagonal bushing 21, and a gear B23 is fixedly sleeved on the outside of the other gear A22. The number of teeth of gear A22 is less than the number of teeth of gear B23. A gear C24 meshes between gear A22 and gear B23. Gear C24 is rotatably nested between the bottom shell 11 and the top shell 13 via bearings.
[0032] Therefore, when tightening the bolt, the product is flipped over, and then the hexagonal bushing 21 inside gear B23 is fitted onto the outside of the bolt. The output shaft of the electric wrench is inserted into the hexagonal bushing 21 inside gear A22. Then, the electric wrench drives gear A22 to rotate. When gear A22 rotates, it drives gear B23 to rotate through gear C24. In turn, gear B23 drives the bolt to rotate through its inner hexagonal bushing 21. Since gear A22 and gear B23 have different numbers of teeth, the difference in the number of teeth between gear A22 and gear B23 can be used to achieve a speed difference, thereby achieving a multiplication of torque.
[0033] like Figure 2 and Figure 3 As shown in this disclosure, the blocking and limiting assembly 3 includes two adjusting holes 31 opened on the top of the top shell 13 and a mounting collar 32 fixedly disposed through the top of the top shell 13. A sliding shaft 33 is slidably disposed on the inner side of the mounting collar 32 in the vertical direction. A limiting plate 34 is fixedly disposed at the bottom end of the sliding shaft 33 and a knob 35 is fixedly disposed at the top end. Two magnets 36 that attract each other are disposed at the bottom of the limiting plate 34. One magnet 36 is fixedly connected to the limiting plate 34 and the other magnet 36 is fixedly connected to the bottom shell 11. A blocking cover plate 37 is fixedly sleeved on the top end of the outer side of the sliding shaft 33. The blocking cover plate 37 slides against the top of the top shell 13 and blocks the two mounting holes 14. An adjusting pin 38 is fixedly disposed through the top of the blocking cover plate 37. The bottom end of the adjusting pin 38 is slidably inserted into the inner side of the adjacent adjusting hole 31 in the vertical direction.
[0034] In its natural state, the two magnets 36 attract each other, causing the sliding shaft 33 to slide down. The cover plate 37 fits against the top of the top shell 13, precisely covering the two mounting holes 14. At the same time, the adjusting pin 38 is inserted into one of the adjusting holes 31. At this time, the hexagonal hole inside the hexagonal bushing 21 is completely sealed, effectively preventing foreign objects such as dust, sand, and oil from entering, thus avoiding jamming when connecting the electric wrench or bolts (solving the problem of exposed bushing openings in existing technologies).
[0035] When using the product, hold the housing assembly 1 with your left hand and pull the knob 35 upwards with your right hand. The knob 35 will cause the sliding shaft 33 to slide upwards inside the mounting collar 32. At this time, the two magnets 36 will separate from each other. Simultaneously, the sliding shaft 33 will drive the adjusting pin 38 out from the inside of the adjacent adjusting hole 31 through the cover plate 37. Then, rotate the knob 35 counterclockwise by 90°. At this time, the adjusting pin 38 will move to the top of the other adjusting hole 31. Then, press the knob 35 down until the adjusting pin 38 is inserted into the inside of the adjacent adjusting hole 31 and locked. At the same time, the two magnets 36 will attract each other again. To form a fixed structure, during the subsequent bolt assembly and disassembly, the cover plate 37 can directly abut against the surface of the parts around the bolt (such as flanges and equipment housings), thereby supporting the product. Compared with the prior art, the cover plate 3 can be used to form a cover for the hexagonal bushing 21, preventing foreign objects from entering and causing jamming when connecting the bolts and the electric wrench. At the same time, after the cover plate 3 releases the cover of the hexagonal bushing 21, it can also provide support for the housing assembly 1 during the subsequent bolt tightening process. It is more flexible and convenient in actual use, and there will be no loss due to disassembly.
[0036] In summary, this application has three advantages, namely, three core advantages:
[0037] Anti-foreign object jamming: When the blocking and limiting component 3 is not in use, it closes the hexagonal bushing 21 to prevent foreign objects from entering;
[0038] Flexible support: After the obstruction is removed, the cover plate 37 can be directly used as a support component, improving operational stability;
[0039] Not easily lost: The blocking and limiting component 3 is an integrated structure that does not require disassembly, solving the problem of easy loss of traditional detachable parts.
[0040] It should also be noted that any content not described in detail in this specification is prior art known to those skilled in the art.
[0041] Those skilled in the art should understand that the above embodiments are merely for illustrating the present disclosure and are not intended to limit the scope of the disclosure. Those skilled in the art can make other changes or modifications based on the above disclosure, and these changes or modifications still fall within the scope of the present disclosure.
Claims
1. A torque multiplier for an electric power wrench, characterized by, include: A housing assembly for mounting the torque multiplier assembly and the blocking and limiting assembly; A torque multiplier component, wherein the torque multiplier component is used to amplify the torque output by the electric wrench; as well as A blocking and limiting assembly includes two adjustment holes on the top of the top shell and a mounting ring fixedly disposed through the top of the top shell. A sliding shaft is slidably disposed on the inner side of the mounting ring in the vertical direction. A limiting plate is fixedly disposed at the bottom end of the sliding shaft and a knob is fixedly disposed at the top end. Two magnets that attract each other are disposed at the bottom of the limiting plate. One magnet is fixedly connected to the limiting plate and the other magnet is fixedly connected to the bottom shell. A blocking cover plate is fixedly sleeved on the top end of the outer side of the sliding shaft. The blocking cover plate slides against the top of the top shell and blocks the two mounting holes. An adjusting pin is fixedly disposed through the top of the blocking cover plate. The bottom end of the adjusting pin is slidably inserted into the inner side of the adjacent adjustment hole in the vertical direction.
2. The torque multiplier for an electric power wrench according to claim 1, characterized by: The housing assembly includes a bottom shell, and an intermediate shell is fixedly disposed on the top of the bottom shell.
3. The torque multiplier for an electrically powered wrench of claim 2, wherein: A top shell is fixedly installed on the top of the intermediate shell, and two mounting holes are opened on the top of the top shell.
4. The torque multiplier for an electric wrench according to claim 3, characterized in that: The torque multiplier assembly includes two hexagonal bushings that are rotatably nested inside two mounting holes via bearings. Gear A is fixedly sleeved on the outer side of one of the hexagonal bushings, and gear B is fixedly sleeved on the outer side of the other gear A. The number of teeth of gear A is less than the number of teeth of gear B.
5. The torque multiplier for an electrically powered wrench of claim 4, wherein: Gear C meshes between gear A and gear B, and gear C is nested between the bottom shell and the top shell via a bearing.