Electrically powered wrench with split assembly

Abstract

The utility model provides a kind of electric wrench of split type assembly, applied to electric tool field, the fuselage connecting shell of main casing and head shell assembly, shell rear cover split type installation, wherein head shell assembly is fixed by head shell and head shell decorative sleeve wedge, the bearing of output shaft and stator assembly are respectively wedge fixed by fuselage fixing piece in the inside of fuselage connecting shell, improve installation efficiency and part fixing effect, reduce the probability of component shedding after long time use;The coaxial concentric installation between the head shell assembly, the fuselage fixing piece and the fuselage connecting shell, the coaxial line of three and the working output axis of electric wrench coincide, so that the fixed electric wrench internal output shaft, strike assembly, gear assembly, stator assembly and other components coaxial installation, effectively avoid eccentric force, improve the torque precision, use safety and comfort of electric wrench.

Description

Technical Field

[0001] This utility model relates to the field of power tools, and more particularly to a split-assembly electric wrench. Background Technology

[0002] With industrial development, many fields such as automobiles, aviation, aerospace, shipbuilding, and chemicals have increasingly higher requirements for assembly quality, demanding more refined stability and reliability during component or module assembly. Traditional manual tools can no longer meet these requirements. Electric wrenches are power tools for tightening and loosening bolts and nuts. Compared to traditional manual tools, electric wrenches can achieve higher strength and more precise bolt tightening, and can even achieve constant torque output, thus becoming a commonly used power tool in modern industry.

[0003] The handle of a typical electric wrench is usually an integrated plastic housing with the body above it, while the wrench head is separately fixed to the front of the body with screws. While the overall structure is aesthetically pleasing, the "7"-shaped casing and its long depth make installation difficult due to the numerous internal components. Furthermore, the current inconvenient installation of electric wrenches results in poor fixation of internal components, leading to easy detachment after prolonged use. This also contributes to low installation accuracy and poor concentricity of internal components, particularly the output shaft, striking assembly, gear assembly, and motor assembly. Consequently, this leads to: 1. Uneven stress on the contact surface between the socket and the bolt or nut, causing abnormal wear or even deformation of the socket's internal teeth or the bolt head; 2. Additional torque load on the output shaft due to eccentric force, causing deformation or even breakage; 3. Decreased torque accuracy, affecting bolt tightening quality and increasing the risk of slippage and operation failure due to eccentric contact between the socket and bolt head; 4. Eccentric rotation of the socket causes high-frequency vibration, reducing operational comfort, accelerating the loosening of internal components, and compromising safety. Therefore, a modular electric wrench is needed to improve installation efficiency while ensuring installation stability. Summary of the Invention

[0004] To address the installation efficiency problem of electric wrenches, this invention improves the structure of the electric wrench housing and proposes a modular electric wrench.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A modular electric wrench includes an outer casing and components installed within it. The outer casing comprises a main housing, a head housing assembly, a body fixing member, and a rear cover. The main housing, from bottom to top, includes a battery pack housing, a handle housing, and a body connecting housing. The body connecting housing has openings at both ends along its own axis. The head housing assembly includes a head housing and a head housing decorative sleeve. The head housing is detachably installed at the front opening of the body connecting housing, and the head housing decorative sleeve is wedged into the front end of the head housing. The body fixing member is installed inside the body connecting housing. The front end of the body fixing member wedged into a bearing, and the rear end of the body fixing member wedged into a stator assembly. The rear cover is installed at the rear opening of the body connecting housing. The head housing assembly, the body fixing member, and the body connecting housing are coaxially and concentrically mounted, with their coaxial line coinciding with the working output axis of the electric wrench.

[0006] In one possible implementation, the main housing is divided into a left housing and a right housing. The left housing includes the battery pack housing, the handle housing, and the body connecting housing, all integrally formed on the left side. The right housing includes the battery pack housing, the handle housing, and the body connecting housing, all integrally formed on the right side. The left housing and the right housing are detachably connected and fixed together.

[0007] In one possible implementation, the left housing and the right housing are fixedly connected by a number of sets of screws.

[0008] In one possible implementation, the front end of the fuselage connecting shell and the rear end of the head shell are fixedly connected by a threaded screw.

[0009] In one possible implementation, the front periphery of the head housing is provided with a first wedge block group, and the inner periphery of the head housing decorative sleeve is provided with a first wedge groove. When the head housing decorative sleeve is fitted and fixed to the front end of the head housing, the first wedge groove and the first wedge block group are tightly wedge-fitted together.

[0010] In one possible implementation, a light plate is provided between the head housing and the head housing decorative sleeve. The light plate is installed at the front end of the head housing. A second wedge block group is provided on the front side of the light plate. A second wedge groove is also provided on the inner periphery of the head housing decorative sleeve. When the head housing decorative sleeve is fitted and fixed to the front end of the head housing, the second wedge groove and the second wedge block group are tightly wedge-fitted.

[0011] In one possible implementation, the first wedge group and the second wedge group are staggered, and the first wedge groove and the second wedge groove are correspondingly staggered.

[0012] In one possible implementation, the front side of the fuselage fixing member is provided with a bearing fixing seat for fixing the bearing.

[0013] In one possible implementation, the rear side of the fuselage fixing member is provided with several rearwardly extending guide grooves, each guide groove having a recessed slot, and the front end of the stator assembly is provided with several forward-extending guide protrusions, each guide protrusion having a raised latch; when the fuselage fixing member is fixed to the stator assembly, the guide grooves and guide protrusions are correspondingly wedge-fitted and fixed, and the slots and latches are correspondingly wedge-fitted and fixed.

[0014] In one possible implementation, the battery assembly, control assembly, and switch assembly of the electric wrench are installed inside the handle housing, and the rotor assembly, stator assembly, body fixing component, bearing, gear assembly, striking assembly, and output shaft of the electric wrench are installed sequentially from back to front inside the body connecting housing and the head housing.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. The main body of the electric wrench is designed as a split structure. The main body is designed as a body connecting shell, a head shell assembly, and a rear cover, which are installed separately. The head shell assembly is fixed by the head shell and the head shell decorative sleeve. Inside the body connecting shell, the output shaft bearing and stator assembly are fixed by the body fixing parts. This structure reduces the difficulty of installing the electric wrench, improves the installation efficiency, enhances the fixing effect, and reduces the probability of parts falling off after long-term use.

[0016] 2. The head housing assembly and body fixing shaft of the electric wrench are concentric and coaxial, further ensuring that the output shaft, gear assembly, striking assembly, stator assembly, and rotor assembly are concentric and coaxially fixed. This prevents uneven force distribution and local stress concentration on the contact surface between the sleeve and the bolt head, which could lead to wear and deformation of the sleeve's internal teeth or the bolt head. It also prevents the output shaft from deforming or even breaking due to additional torque load caused by eccentric force, thus ensuring the torque accuracy of the electric wrench and improving user comfort and safety. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 Right view of a modular electric wrench; Figure 2 A front view of a modular electric wrench; Figure 3 Exploded view of a key component of a modular electric wrench; Figure 4 A schematic diagram of the head shell decorative cover; Figure 5 This is a schematic diagram of the lamp panel structure; Figure 6 This is a schematic diagram of the structure of the nose cone casing; Figure 7 A schematic diagram of the fuselage fixing components and the bearings and stator assemblies on the front and rear sides; Figure 8 An exploded view of a modular electric wrench.

[0019] Among them, the main housing 1, the battery pack housing 11, the handle housing 12, the body connecting housing 13, the left housing 101, and the right housing 102; The machine head housing assembly 2, the machine head housing 21, the head housing decorative sleeve 22, the light panel 23; the first wedge block group 211, the first wedge groove 221, the second wedge groove 222, and the second wedge block group 231; 3. Body fixing component; 31. Bearing fixing seat; 32. Guide groove; 33. Slot; 4. Rear cover of the housing; 100. Battery assembly; 200. Control assembly; 300. Switch assembly; 400. Rotor assembly; 500. Stator assembly; 501. Guide protrusion; 502. Clamping tongue; 600. Bearing; 700. Gear assembly; 800. Impact assembly; 900. Output shaft. Detailed Implementation

[0020] To provide a better understanding of the purpose, structure, features, and functions of this utility model, detailed descriptions are provided below with reference to specific embodiments.

[0021] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0022] Please refer to the reference. Figures 1-8A modular electric wrench includes an outer casing and components installed within it. The outer casing includes a main housing 1, a head housing assembly 2, a body fixing component 3, and a rear cover 4. The main housing 1, from bottom to top, includes a battery pack housing 11, a handle housing 12, and a body connecting housing 13, with openings at both ends along its own axis. The head housing assembly 2 includes a head housing 21 and a head housing decorative sleeve 22, with the head housing 21 detachably mounted on the body connecting housing. At the front opening of the head shell, the head shell decorative sleeve 22 is wedged and installed at the front end of the head shell 21; the body fixing part 3 is installed inside the body connecting shell 13, the front end of the body fixing part 3 is wedged with the bearing 600, the rear end of the body fixing part 3 is wedged with the stator assembly 500, and the rear cover 4 of the machine shell is installed at the rear opening of the body connecting shell 13; the head shell assembly 2, the body fixing part 3 and the body connecting shell 13 are coaxially and concentrically installed, and the coaxial line of the three coincides with the working output shaft 900 line of the electric wrench.

[0023] Aside from its external housing, the internal components of an electric wrench can be the same as or similar to those of commercially available electric wrenches, or any components and connection methods capable of realizing the functions of an electric wrench can be selected. In one embodiment, its internal functional components include all or more of the following: battery assembly 100, control assembly 200, switch assembly 300, drive assembly, gear assembly 700, striking assembly 800, and output shaft 900. The output shaft 900 is connected to a fixed sleeve at the front end of the electric wrench, and the fixed sleeve is fitted and fixed to the head of a nut or bolt for operation. The battery assembly 100 can be a battery block or battery pack, which can be lithium batteries or other dry batteries, or it can be directly connected to a power source by wires; the control assembly 200 includes a control board and a control panel. The control board is used to realize information integration, calculation and control, and the control panel is used to display the operating parameters or operating information of the electric wrench, so that the user can quickly grasp the operating status; the switch assembly 300 includes a power switch, forward and reverse gear, speed control switch and other physical switch buttons; the drive assembly includes a motor or other driveable gear set and output shaft 900 composed of a stator assembly 500 and a rotor assembly 400.

[0024] The electric wrench of this application, apart from the main housing 1, has a head housing assembly 2 at the front end divided into a head housing 21 and a head housing decorative sleeve 22. These are wedge-fitted together and detachably mounted on the front end of the body connecting housing 13. The rear cover 4 is detachably mounted on the rear end of the body connecting housing 13. Together, these three components form a complete outer housing. Inside the housing of this electric wrench, a body fixing component 3 is specially provided. The front end wedges and fixes the bearing 600, and the rear end wedges and fixes the stator assembly 500, thereby securing the internal components. The head housing assembly 2 at the front end of the electric wrench cooperates with the body fixing component 3, giving the electric wrench a split structure. This facilitates the installation of various internal components, resulting in higher installation efficiency and better fixation. Furthermore, it better ensures that the internal output shaft 900, striking assembly 800, gear assembly 700, stator assembly 500, rotor assembly 400, and other components are concentric and coaxial.

[0025] The electric wrench of this application adopts a split structure for easy and quick installation, and the components are reliably fixed and not easily detached. It also ensures that the main internal output drive and transmission components are concentric and coaxial. Based on this concentric and coaxial installation, when the electric wrench is in use, the socket is fitted onto the bolt head or nut, ensuring uniform force on the contact surface between the socket and the bolt head. This avoids the additional torque load generated by the 90° eccentric force on the output shaft of the electric wrench, thereby preventing damage to the drive shaft and abnormal wear between the socket and the bolt / nut. Furthermore, it maintains the torque accuracy of the electric wrench over a long period, ensuring the quality of bolt tightening and preventing risks such as operation failure and bolt damage due to slippage caused by eccentric contact between the socket and the bolt head, thus improving safety and reliability. In addition, eccentric rotation can cause high-frequency vibration, which not only reduces operating comfort but may also loosen internal parts of the electric wrench. This application ensures that key components are installed concentrically and coaxially, avoiding such mechanical vibration and improving operating comfort and component installation reliability.

[0026] Please refer to the reference. Figure 1 , Figure 8 In some embodiments, the main housing 1 is divided into a left housing 101 and a right housing 102. The left housing 101 includes a battery pack housing 11 integrally formed on the left half, a handle housing 12, and a body connecting housing 13. The right housing 102 includes a battery pack housing 11 integrally formed on the right half, a handle housing 12, and a body connecting housing 13. The left housing 101 and the right housing 102 are detachably connected and fixed. Furthermore, the assembly surfaces of the left housing 101 and the right housing 102 are parallel to the working output shaft 900 line of the electric wrench. This structure allows all internal components to be directly and accurately placed in the left housing 101 or the right housing 102 according to the installation requirements, resulting in high installation efficiency and precise positioning.

[0027] Please refer to the reference. Figure 8In a further embodiment, the left housing 101 and the right housing 102 are fixedly connected by several sets of screws. Since the left housing 101 and the right housing 102 have different functional areas from bottom to top, the different functional areas are fixed with several sets of screws to ensure the locking effect. For example, the battery pack outer shell 11 of the left housing 101 and the right housing 102 can be locked with at least one screw on the front and back sides according to the specific shape; the handle outer shell 12 can be locked with at least two screws according to the specific structure to avoid the parts; and the body connecting shell 13 can be locked with at least six screws on the upper and lower sides according to the specific structure of the internal parts to avoid the parts. This structure is designed to make the left housing 101 and the right housing 102 tightly connected, thereby effectively ensuring the precise installation of the internal parts.

[0028] In some embodiments, the connection port between the body connecting shell 13 and the head housing 21 can be circular, and the front end of the body connecting shell 13 and the rear end of the head housing 21 are connected and fixed by threaded screwing. This structure provides better fixation between the body connecting shell 13 and the head housing 21, makes installation more convenient and efficient, and facilitates disassembly and inspection.

[0029] In other embodiments, the connection between the fuselage connecting shell 13 and the head shell 21 may include, but are not limited to, wedge-fitting, snap-locking, or other detachable fastening connection methods.

[0030] Please refer to the reference. Figures 3-6 In some embodiments, the front periphery of the head housing 21 is provided with a first wedge block assembly 211, and the inner periphery of the head housing decorative sleeve 22 is provided with a first wedge groove 221. When the head housing decorative sleeve 22 is fitted and fixed on the front end of the head housing 21, the first wedge groove 221 and the first wedge block assembly 211 are tightly wedge-fitted. In this embodiment, the tight wedge-fitting and fixing between the first head housing 21 and the head housing decorative sleeve 22 can further confine and secure components such as the output shaft 900 at their installation positions, further ensuring that they are installed concentrically and coaxially with other key components.

[0031] Please refer to the reference. Figure 4 In a further embodiment, each wedge in the first wedge block group 211 is a protruding structure with an inclined surface or a taper. The first wedge groove 221 can be a groove that matches the shape and number of the first wedge blocks one by one, achieving a fit through compression or guidance. The first wedge block group 211 and the first wedge groove 221 can be an interference fit. Furthermore, the first wedge block is set as a dovetail tenon, that is, the cross section is pointed, similar to a dovetail shape, which can achieve high-precision positioning and locking, and prevent it from sliding or rotating after installation. This structure has both fastening function and positioning accuracy function.

[0032] In other embodiments, each wedge in the first wedge block group 211 is a flexible latch structure, and the first wedge groove 221 is a groove 33 structure that cooperates with the latch. When the head shell decorative sleeve 22 and the head shell 21 are wedge-fitted and fixed, the groove 33 and the latch cooperate with each other to achieve quick disassembly and assembly.

[0033] Please refer to the reference. Figure 5 In some embodiments, a light plate 23 is also provided between the head housing 21 and the head housing decorative sleeve 22. The light plate 23 is installed at the front end of the head housing 21. A second wedge block assembly 231 is provided on the front side of the light plate 23. A second wedge groove 222 is also provided on the inner periphery of the head housing decorative sleeve 22. When the head housing decorative sleeve 22 is fitted and fixed to the front end of the head housing 21, the second wedge groove 222 and the second wedge block assembly 231 are tightly wedge-fitted. The light plate 23 is a common component in electric wrenches. In this embodiment, a second wedge block assembly 231 is provided on the front side of the light plate 23, which is also wedge-fitted and fixed to the head housing decorative sleeve 22, further improving the fastening function and positioning accuracy. The second wedge block assembly 231 is the same as the first wedge block assembly 211. It can adopt a protruding structure with a bevel or taper for compression or guiding fit, or a dovetail tenon for high-precision positioning fit, or a latch 502 for elastic quick installation fit, etc.

[0034] In some embodiments, the first wedge group 211 and the second wedge group 231 are staggered, and the first wedge groove 221 and the second wedge groove 222 are correspondingly staggered. In this structure, there are two sets of staggered fastening structures between the head shell decorative sleeve 22 and the head shell 21: the first wedge group 211 and the first wedge groove 221, and the second wedge group 231 and the second wedge groove 222. This achieves a better wedge fastening effect, and the staggered arrangement of the first wedge group 211 and the second wedge group 231 also facilitates the quick installation of the lamp plate 23.

[0035] Please refer to the reference. Figure 7 In some embodiments, the front side of the body fixing member 3 is provided with a bearing fixing seat 31 for fixing the bearing 600. The bearing 600 is usually used to fix the output shaft 900 or the gear set. Thus, the body fixing member 3 can fix the gear set or the output shaft 900 through the bearing fixing seat 31, thereby enabling the output shaft 900, the gear assembly 700, the impact assembly 800, and the stator assembly 500 to be installed concentrically and coaxially.

[0036] Please refer to the reference. Figure 7In some embodiments, the rear side of the fuselage fixing member 3 is provided with several rearwardly extending guide grooves 32, each guide groove 32 having a concave retaining groove 33. The front end of the stator assembly 500 is provided with several forward-extending guide protrusions 501, each guide protrusion 501 having a protruding retaining tongue 502. When the fuselage fixing member 3 is fixed to the stator assembly 500, the guide grooves 32 and guide protrusions 501 are correspondingly wedge-fitted and fixed, and the retaining grooves 33 and retaining tongues 502 are correspondingly wedge-fitted and fixed. The guide grooves 32 and guide protrusions 501 achieve a primary engagement by pressing the latter to guide, improving the positioning accuracy and fastening function of the wedge-fitting installation. The retaining grooves 33 and retaining tongues 502 achieve a secondary engagement through elastic deformation connection, further tightening the positioning while enabling quick assembly and disassembly.

[0037] Please refer to the reference. Figure 8 In some embodiments, the battery assembly 100, control assembly 200, and switch assembly 300 of the electric wrench are installed inside the handle housing 12. The rotor assembly 400, stator assembly 500, body fixing part 3, bearing 600, gear assembly 700, striking assembly 800, and output shaft 900 of the electric wrench are installed sequentially from back to front inside the body connecting housing 13 and the head housing 21. The reasonable layout of the internal components improves installation efficiency and user comfort.

[0038] This utility model has been described by the above-described embodiments; however, these embodiments are merely examples for implementing this utility model. It must be noted that the disclosed embodiments do not limit the scope of this utility model. Conversely, any modifications and refinements made without departing from the spirit and scope of this utility model are within the scope of patent protection of this utility model.

Claims

1. A modular electric wrench, comprising a housing and components mounted within the housing, characterized in that: The outer casing includes a main casing, a head casing assembly, a fuselage fixing component, and a rear casing cover; The main housing comprises, from bottom to top, a battery pack housing, a handle housing, and a body connecting housing. The body connecting housing has openings at both ends along its own axis. The head housing assembly includes a head housing and a head housing decorative sleeve. The head housing is detachably installed at the front opening of the body connecting housing, and the head housing decorative sleeve is wedged into the front end of the head housing. The body fixing member is installed inside the body connecting housing. The front end of the body fixing member wedged into the bearing, and the rear end of the body fixing member wedged into the stator assembly. The rear cover of the housing is installed at the rear opening of the body connecting housing. The head housing assembly, the body fixing member, and the body connecting housing are coaxially and concentrically installed, and their coaxial line coincides with the working output axis of the electric wrench.

2. The split-assembly electric wrench as described in claim 1, characterized in that: The main housing is divided into a left housing and a right housing. The left housing includes the battery pack housing, the handle housing, and the body connecting housing, which are integrally formed on the left half. The right housing includes the battery pack housing, the handle housing, and the body connecting housing, which are integrally formed on the right half. The left housing and the right housing are detachably connected and fixed.

3. The split-assembly electric wrench as described in claim 2, characterized in that: The left housing and the right housing are fixedly connected by several sets of screws.

4. The split-assembly electric wrench as described in claim 1, characterized in that: The front end of the fuselage connecting shell and the rear end of the head shell are fixedly connected by a threaded screw.

5. The split-assembly electric wrench as described in claim 1, characterized in that: The front end periphery of the machine head housing is provided with a first wedge block group, and the inner periphery of the head housing decorative sleeve is provided with a first wedge groove. When the head housing decorative sleeve is fitted and fixed to the front end of the machine head housing, the first wedge groove and the first wedge block group are tightly wedgeed together.

6. The split-assembly electric wrench as described in claim 5, characterized in that: A light plate is also provided between the machine head housing and the head housing decorative sleeve. The light plate is installed at the front end of the machine head housing. A second wedge block group is provided on the front side of the light plate. A second wedge groove is also provided on the inner periphery of the head housing decorative sleeve. When the head housing decorative sleeve is fitted and fixed to the front end of the machine head housing, the second wedge groove and the second wedge block group are tightly wedgeed together.

7. The split-assembly electric wrench as described in claim 6, characterized in that: The first wedge block group and the second wedge block group are staggered, and the first wedge groove and the second wedge groove are staggered accordingly.

8. The split-assembly electric wrench as described in claim 1, characterized in that: The front side of the fuselage fixing component is provided with a bearing fixing seat for fixing the bearing.

9. The split-assembly electric wrench as described in claim 8, characterized in that: The rear side of the fuselage fixing component is provided with several rearwardly extending guide grooves, each guide groove having a recessed slot. The front end of the stator assembly is provided with several forward-extending guide protrusions, each guide protrusion having a raised latch. When the fuselage fixing component is fixed to the stator assembly, the guide grooves and guide protrusions are wedge-fitted and fixed, and the slots and latches are wedge-fitted and fixed.

10. The split-assembly electric wrench as described in claim 1, characterized in that: The battery assembly, control assembly, and switch assembly of the electric wrench are installed inside the handle housing. The rotor assembly, stator assembly, body fixing component, bearing, gear assembly, striking assembly, and output shaft of the electric wrench are installed sequentially from back to front inside the body connecting housing and the head housing.

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