A ball electric screwdriver

Abstract

A kind of spherical electric screwdriver, including spherical handle shell, controller arranged in shell, battery assembly, motor, reducer driven by motor and chuck shaft driven by reducer;The shell includes a barrel with spherical end, motor, reducer and battery assembly are combined into pre-assembled assembly by locating support arranged between motor and reducer, and limiting structure between motor and battery assembly.The utility model has the following advantages compared with prior art: the utility model combines motor, reducer and battery assembly into pre-assembled assembly, when assembling, pre-assembled assembly is inserted into shell from parts assembling entrance, rear end is locked in shell by screw, after covering rear cover, it can be, greatly improve the assembly efficiency of product, and ensure the accurate docking between motor, reducer and battery assembly, product stability is high.

Description

Technical Field

[0001] This utility model relates to power tools, and more particularly to a ball screwdriver. Background Technology

[0002] An electric screwdriver is a power tool used to tighten or loosen screws. Most common electric screwdrivers are handheld, equipped with a bit and a switch. Internally, they contain a power supply and a motor. Users can activate the switch to power the motor, which in turn rotates the bit to turn the screwdriver.

[0003] Common electric screwdriver handle structures include gun-shaped, ball-shaped, and straight-barreled. Gun-shaped handles are relatively large and less maneuverable, while ball-shaped and straight-barreled handles are smaller, making them more convenient and portable. Compared to straight-barreled handles, ball-shaped handle electric screwdrivers offer advantages in grip comfort, operational stability, anti-slip performance, torque control, maneuverability in confined spaces, visibility, and continuous use. 1. Grip Comfort: The ball-shaped design of ball-shaped electric screwdrivers conforms to the natural curve of the hand, distributing pressure evenly and reducing fatigue during prolonged use. Straight-barreled electric screwdrivers have a linear contact point, concentrating pressure in a specific area, which can easily lead to hand fatigue. 2. Operational Stability: The center of gravity of a ball-shaped electric screwdriver is located in the center of the palm, making it more stable during rotation and less prone to deviation. The linear center of gravity of a straight-barreled electric screwdriver makes it more prone to deflection when torque is applied. 3. Anti-slip performance: Spherical electric screwdrivers have a larger surface area, allowing for more effective anti-slip patterns; cylindrical electric screwdrivers have limited anti-slip area and are prone to slipping during intensive use. 4. Operation in confined spaces: The spherical tail of a spherical electric screwdriver reduces the operating radius, allowing for greater flexibility in limited spaces; the straight length of a cylindrical electric screwdriver restricts operating space. 5. Visibility: The optimized angle between the working head and handle of a spherical electric screwdriver provides better visibility; the straight line of a cylindrical electric screwdriver partially obstructs the view. 6. Advantages for continuous use: The spherical design makes it easier to hold and operate with one hand, and the spherical design distributes pressure, making it suitable for long-term work; the cylindrical design can easily lead to hand muscle fatigue, and requires greater grip strength to maintain stability.

[0004] As disclosed in prior art (CN212763215U), a battery-removable electric screwdriver includes a handle portion. The handle portion comprises an outer shell and an inner shell. The inner shell has a receiving cavity, in which a rechargeable battery and a motor are arranged from back to front. The top surface of the inner shell also has a circuit board placement portion, on which a PCB board is placed. The rear end of the PCB board has a charging interface. The motor wiring is connected to the PCB board, and the PCB board is connected to the rechargeable battery. A switch is connected to the PCB board. The motor shaft is connected to the rear end of a gear set. A power transmission component protective cover is fitted over the gear set. The front end of the gear set is connected to a clamping head, and a quick-release chuck is provided on the outside of the clamping head. The front end of the outer shell has a locking sleeve, and the rear end of the outer shell has a rear cover. The rear cover connects the outer shell and the inner shell as a single unit using screws. This type of electric screwdriver uses an inner shell or bracket to assemble the motor, gear set, battery, etc., and then inserts the inner shell into the outer shell to complete the product assembly process. This structure is suitable for electric screwdrivers with larger outer shells. For spherical electric screwdrivers with smaller outer shells, the limited internal space makes it impossible to install the inner shell or bracket.

[0005] Therefore, ball screwdrivers generally can only use a two-part snap-fit ​​shell structure, such as... Figure 1 As shown, its motor, battery pack, reducer, and other components require internal limiting ribs or grooves for positioning and installation. Furthermore, its torque design is generally less than five Newtons, limiting its application range. Because its casing uses a two-part interlocking structure, increasing the torque to five Newtons or more will cause the two interlocking halves to separate and break apart during use. To solve this technical problem, the casing needs to be made into a single cylindrical structure, and pre-installed brackets cannot be used to fix the reducer, motor, and battery. Stably and reliably installing the reducer, motor, and battery into the cylindrical casing in their designated positions is extremely difficult. Utility Model Content

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a spherical electric screwdriver with a cylindrical outer shell.

[0007] The main technical solution of the spherical electric screwdriver provided by this utility model is as follows: it includes a spherical handle housing, a controller, a battery pack, a motor, a reducer driven by the motor, and a bit shaft driven by the reducer; the housing is characterized in that the housing includes a cylindrical body with one end spherical, a parts loading inlet on one end of the cylindrical body near the spherical part, a rear cover on the parts loading inlet, and a bit opening on the other end of the cylindrical body; one end of the bit shaft is connected to the reducer, and the other end of the bit shaft extends out from the bit opening;

[0008] The electric motor, reducer, and battery pack are assembled into a pre-assembled assembly via a positioning bracket between the electric motor and the reducer, and a limiting structure between the electric motor and the battery pack.

[0009] The spherical electric screwdriver provided by this utility model also adopts the following auxiliary technical solutions:

[0010] Preferably, the positioning bracket is fixedly connected to the motor, and the positioning bracket is positioned and matched with the reducer.

[0011] Preferably, the positioning bracket includes a positioning plate, a limiting ring with an edge of the positioning plate, and a positioning piece extending from the limiting ring toward one end of the reducer; the positioning plate is provided with a locking hole, and the positioning plate is connected to the motor through the locking hole by a locking member; the limiting ring is sleeved on the bottom of the reducer, and the reducer is provided with a positioning groove, into which the positioning piece is inserted.

[0012] Preferably, a controller pad extends from the side of the limiting ring toward the motor.

[0013] Preferably, the limiting structure between the motor and the battery assembly includes a plug on the battery assembly and a slot on the motor, wherein the plug and the slot are engaged; the battery assembly includes a battery bracket and a battery mounted on the battery bracket, and the plug is located on the battery bracket.

[0014] Preferably, the controller includes a PCB board, the PCB board includes an operating part and a positioning part, and the battery bracket is provided with a snap-fit ​​groove, the positioning part is limited to the snap-fit ​​groove.

[0015] The outer casing has a control window. After the PCB board is installed in the casing, the operating part is opposite to the control window.

[0016] Preferably, the motor is provided with a positioning pad, the positioning pad is provided with a pad slot, and the battery assembly is provided with a plug, which is inserted into the pad slot.

[0017] Preferably, the housing has a positioning protrusion inside, and the outer wall of the reducer has a positioning slot. During the process of the pre-assembled assembly being inserted into the housing through the parts loading inlet, the positioning protrusion is inserted into the positioning slot.

[0018] Preferably, the component loading inlet has a fixing hole, and the battery assembly has a fixing ear. The fixing hole and the fixing ear are connected by a locking member.

[0019] Preferably, the motor is clamped and fixed in the housing by the battery assembly and positioning bracket, and an annular gap is formed between the motor and the inner wall of the housing.

[0020] Compared with the prior art, the spherical electric screwdriver provided by this utility model has the following advantages: The outer shell of this utility model is a cylindrical structure with one end spherical, which, compared with the two-half handle structure of existing spherical electric screwdrivers, avoids the phenomenon of the two halves of the outer shell separating and breaking apart when a small spherical electric screwdriver outputs a large torque; it greatly improves the applicability of small spherical electric screwdrivers; at the same time, this utility model combines the motor, reducer, and battery pack into a pre-assembled assembly. During assembly, the pre-assembled assembly is inserted into the outer shell through the parts insertion port, and the rear end is locked in the outer shell with screws. Then, the back cover is closed, greatly improving the assembly efficiency of the product and ensuring precise connection between the motor, reducer, and battery pack, resulting in high product stability. Attached Figure Description

[0021] Figure 1 This is a structural diagram of the two-half housing of a ball screwdriver in the prior art.

[0022] Figure 2 This is an exploded view of the structure of Embodiment 1 of this utility model.

[0023] Figure 3 This is a structural diagram of the positioning bracket in Embodiment 1 of this utility model.

[0024] Figure 4 This is a structural diagram of the reducer in Embodiment 1 of this utility model.

[0025] Figure 5 This is a structural diagram of the electric motor and battery before assembly in Embodiment 1 of this utility model.

[0026] Figure 6 This is a structural diagram of the pre-assembled assembly in Embodiment 1 of this utility model.

[0027] Figure 7 This is a structural diagram of the pre-assembled assembly after it is connected to the PCB board in Embodiment 1 of this utility model.

[0028] Figure 8 This is a structural diagram of the cylinder in Embodiment 1 of this utility model.

[0029] Figure 9 This is a structural diagram of the spherical electric screwdriver of this utility model.

[0030] Figure 10 for Figure 9 Cross-sectional view of AA.

[0031] Figure 11 This is an exploded view of the structure of the motor and positioning pad in Embodiment 2 of this utility model. Detailed Implementation

[0032] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] Example 1

[0034] See Figures 2 to 7 According to the embodiment of the spherical electric screwdriver provided by the utility model, it includes a spherical handle housing 1, a controller, a battery assembly 2, a motor 3, a reducer 4 driven by the motor 3, and a bit shaft 5 driven by the reducer 4; the housing 1 includes a cylindrical body 11 with one end spherical, a part loading inlet 111 provided at one end of the cylindrical body 11 near the spherical part, a detachable rear cover 12 provided on the part loading inlet 111, and a bit opening 112 provided at the other end of the cylindrical body 11; one end of the bit shaft 5 is connected to the reducer 4, and the other end of the bit shaft 5 extends out from the bit opening 112; the reducer 4 is located at the front end of the motor 3, and the battery assembly 2 is located at the rear end of the motor 3; the motor 3, the reducer 4, and the battery assembly 2 are connected to a positioning bracket 6 between the motor 3 and the reducer 4, and a limiting structure between the motor 3 and the battery assembly 2 to form a pre-assembled assembly; the pre-assembled assembly enters the housing 1 through the part loading inlet 111. In the field of electric screwdrivers, the connection method between the reducer 4 and the bit shaft 5 is a relatively mature technology in the prior art, and will not be described in detail here. In this utility model, the outer shell 1 is a cylindrical body 11 with one end spherical. Compared with the existing ball screwdrivers with a two-half handle structure, this avoids the phenomenon of the two halves of the outer shell 1 separating and breaking apart when the small ball screwdriver outputs a large torque; it greatly improves the applicability of small ball screwdrivers. At the same time, this utility model combines the motor 3, reducer 4 and battery pack 2 into a pre-assembled assembly. During assembly, the pre-assembled assembly is inserted into the outer shell 1 through the parts loading inlet 111, and the rear end is locked in the outer shell 1 with screws. Then the rear cover 12 is closed, which greatly improves the assembly efficiency of the product and ensures the precise docking between the motor 3, reducer 4 and battery pack 2, resulting in high product stability.

[0035] See Figures 2 to 7According to the above-described embodiment of the utility model, the positioning bracket 6 is fixedly connected to the motor 3, and the positioning bracket 6 is positioned and engaged with the reducer 4. During assembly, the worker holds the pre-assembled assembly in one hand and the outer casing 1 in the other, with the parts loading inlet 111 tilted downwards and the reducer 4 tilted upwards from the worker's perspective, typically at an angle of 45-80 degrees. The other hand aligns the parts loading inlet 111 with the reducer 4 at a fixed angle and pushes the pre-assembled assembly into the outer casing 1. Since the reducer 4 and motor 3 are relatively heavy, if the positioning bracket 6 were to be positioned and engaged with both, they would be very easy to separate and fall during assembly. Therefore, the positioning bracket 6 is fixedly connected to the motor 3 on one side with screws, and positioned and engaged with the reducer 4 on the other side. This ensures the assembly efficiency of the pre-assembled assembly and prevents the reducer 4 and motor 3 from separating during assembly with the outer casing 1, improving the overall assembly efficiency and accuracy, thereby increasing the product yield.

[0036] See Figure 3 , Figure 4 and Figure 6 According to the above-described embodiment of the utility model, the positioning bracket 6 includes a positioning plate 61, a limiting ring 62 with an edge of the positioning plate 61, and a positioning piece 63 extending from the limiting ring 62 toward one end of the reducer 4. The positioning plate 61 has a locking hole 64, and the positioning plate 61 is connected to the motor 3 via a locking element passing through the locking hole 64. The limiting ring 62 is sleeved on the bottom of the reducer 4, and the reducer 4 has a positioning groove 41. The positioning piece 63 is inserted into the positioning groove 41, and the locking element is a screw. The axial cross-section of the positioning piece 63 is arc-shaped, or the inner side of the positioning piece 63 is arc-shaped, ensuring the fit between the positioning piece 63 and the reducer 4, thereby ensuring the axial positioning of the reducer 4 by the positioning bracket 6. The positioning plate 61 has a hollow structure, which helps to improve the mechanical strength of the component. The limiting ring 62 is fitted between the bottom of the reducer 4 and the reducer 4, and has the functions of axial positioning and radial limiting. The extended positioning piece 63 has the functions of axial positioning and axial limiting between the positioning groove 41 of the reducer 4, so as to prevent the reducer 4 from swaying or shaking on the positioning bracket 6 during the assembly process.

[0037] See Figure 3 , Figure 6 and Figure 10 According to the above-described embodiment of the utility model, a controller pad 65 extends from the side of the limiting ring 62 toward the motor 3. After the product is assembled, the controller pad 65 is located below the PCB board 7 of the controller, which helps to simplify the internal structure of the housing 1 and ensures the stability of the controller during operation.

[0038] See Figures 5 to 8According to the above-described embodiment of the utility model, the limiting structure between the motor 3 and the battery assembly 2 includes an insert 211 on the battery assembly 2 and a slot 31 on the motor 3, wherein the insert 211 and the slot 31 are inserted into each other. The battery assembly 2 includes a battery bracket 21 and a battery 22 mounted on the battery bracket 21, and the insert 211 is located on the battery bracket 21. The limiting structure provides a positioning fit between the motor 3 and the battery assembly 2, preventing radial movement or rotation of the motor 3. During assembly, the mating position of the motor 3 and the battery assembly 2 is relatively low, allowing workers to hold them together. Therefore, the positioning fit alone prevents the motor 3 and the battery assembly 2 from dispersing during assembly, facilitating pre-assembly. The parts loading inlet 111 has a fixing hole 113, and the battery assembly 2 has a fixing ear 212 located on the battery bracket 21. The fixing hole 113 and the fixing ear 212 are connected by a locking element, which is a screw. The alignment and assembly of the fixing lug 212 and the fixing hole 113 also provides a reference point for the accurate installation of the pre-assembled assembly and the housing 1. The fixing hole 113 and the fixing lug 212 are tightened with screws, thus completing the assembly between the pre-assembled assembly and the housing 1.

[0039] See Figures 5 to 8 and Figure 10 According to the above-described embodiment of the utility model, the controller includes a PCB board 7, which includes an operation part 71 and a positioning part 72. A snap-fit ​​groove 213 is provided on the battery bracket 21, and the positioning part 72 is engaged with the snap-fit ​​groove 213. An operating window 115 is provided on the housing 1. After the PCB board 7 is installed into the housing, the operation part 71 faces the operating window 115, and the controller pad 65 is pressed against the bottom of the operation part 71. A button assembly is provided on the operating window 115, and the button assembly cooperates with the operation part. During assembly, after the positioning part 72 is engaged with the snap-fit ​​groove 213, the PCB board 7 is simultaneously inserted into the housing 1 through the parts loading inlet 111 along with the pre-assembled assembly, further simplifying the product assembly process and improving assembly efficiency and accuracy.

[0040] See Figures 6 to 8 According to the above-described embodiment of the utility model, a positioning protrusion 114 is provided inside the outer casing 1, and a positioning slot 42 is provided on the outer wall of the reducer 4. During the process of the pre-assembled assembly being inserted into the outer casing 1 through the parts loading inlet 111, the positioning protrusion 114 is inserted into the positioning slot 42. The positioning protrusion 114 and the positioning slot 42 on the reducer 4 cooperate to complete the positioning between the front end of the pre-assembled assembly and the outer casing 1. The fixing hole 113 on the outer casing 1 and the fixing ear 212 on the battery bracket 21 are locked with screws to complete the positioning between the rear end of the pre-assembled assembly and the outer casing 1, ensuring the stability and reliability between the pre-assembled assembly and the outer casing 1.

[0041] See Figure 6 , Figure 7 and Figure 10According to the above-described embodiment of the utility model, the motor 3 is clamped and fixed in the housing by the battery assembly 2 and the positioning bracket 6, and an annular gap 8 is formed between the motor 3 and the inner wall of the housing 1. This utility model uses the above structure to fix the motor 3 inside the housing 1, with no direct contact between the motor 3 and the inner wall of the housing 1. This helps to buffer the vibration of the motor 3 during operation, while also helping to reduce the noise of the motor 3 during operation and improve the heat dissipation efficiency of the motor 3.

[0042] Example 2

[0043] This embodiment is largely the same in structure as Embodiment 1 above, except that a positioning pad 9 is provided between the motor 3 and the battery bracket 21. See [link / reference] Figure 11 The motor 3 is equipped with a positioning pad 9, which engages with the electric motor. The positioning pad 9 has a pad slot 91, and the battery assembly 2 has a plug 211, which engages with the pad slot 91. The rear cover 12 of the motor 3 is typically made of plastic. During use, the electric screwdriver causes the rear cover 12 of the motor 3 to vibrate against the battery assembly 2. Uneven force can damage the rear cover 12 of the motor 3. The positioning pad 9 ensures more even force distribution between the battery assembly 2 and the rear cover 12 of the motor 3, extending the product's lifespan.

[0044] The technical solution provided by this utility model has been described in detail above. Specific examples have been used to illustrate the principle and implementation of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. The terms "front," "back," "left," "right," "positive," and "negative" in this solution are all terms used to describe things clearly from a certain perspective. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A power screwdriver of the ball type comprising a ball handle housing, a control disposed within the housing, a battery assembly, a motor, a speed reducer driven by the motor, and a bit shaft driven by the speed reducer; characterized in that, The outer casing includes a cylindrical body with one end spherical, a parts loading inlet on one end of the cylindrical body near the spherical part, a rear cover on the parts loading inlet, and a bit opening on the other end of the cylindrical body; one end of the bit shaft is connected to the reducer, and the other end of the bit shaft extends out from the bit opening; The electric motor, reducer, and battery pack are assembled into a pre-assembled assembly via a positioning bracket between the electric motor and the reducer, and a limiting structure between the electric motor and the battery pack.

2. The ball driver according to claim 1, wherein The positioning bracket is fixedly connected to the motor and is positioned in conjunction with the reducer.

3. The ball driver according to claim 2, wherein The positioning bracket includes a positioning plate, a limiting ring with an edge of the positioning plate, and a positioning piece extending from the limiting ring toward one end of the reducer; the positioning plate has a locking hole, and the positioning plate is connected to the motor through the locking hole by a locking element; the limiting ring is sleeved on the bottom of the reducer, and the reducer has a positioning groove, into which the positioning piece is inserted.

4. The spherical electric screwdriver according to claim 3, characterized in that, A controller pad extends from the side of the limit ring toward the motor.

5. The spherical electric screwdriver according to claim 1, characterized in that, The limiting structure between the motor and the battery assembly includes a plug on the battery assembly and a slot on the motor, wherein the plug and the slot are engaged; the battery assembly includes a battery bracket and a battery mounted on the battery bracket, and the plug is located on the battery bracket.

6. The spherical electric screwdriver according to claim 5, characterized in that, The controller includes a PCB board, which includes an operating part and a positioning part. The battery bracket has a snap-fit ​​slot, and the positioning part is matched with the snap-fit ​​slot for limiting.

7. The spherical electric screwdriver according to any one of claims 1-4, characterized in that, The motor is provided with a positioning pad, the positioning pad is provided with a pad slot, and the battery assembly is provided with a plug, which is inserted into the pad slot.

8. The spherical electric screwdriver according to any one of claims 1-6, characterized in that, The housing has a positioning protrusion inside, and the outer wall of the reducer has a positioning slot. During the process of the pre-assembled assembly being inserted into the housing through the parts loading inlet, the positioning protrusion is inserted into the positioning slot.

9. The spherical electric screwdriver according to any one of claims 1-6, characterized in that, The component loading inlet has a fixing hole, and the battery assembly has a fixing lug. The fixing hole and the fixing lug are connected by a locking mechanism.

10. The spherical electric screwdriver according to any one of claims 1-6, characterized in that, The motor is clamped and fixed in the housing by the battery assembly and positioning bracket, and an annular gap is formed between the motor and the inner wall of the housing.

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