Adapter of electric screwdriver

Abstract

The utility model relates to an electric screwdriver adapter. The electric screwdriver adapter comprises an input gear box, an output gear box and a transmission module. And an input gear shaft connected with an output shaft of the electric screwdriver is rotationally arranged in the input gear box. And an output gear shaft connected with the screwdriver head is rotationally arranged in the output gear box. The transmission module is located in the cavity. The transmission module comprises an input gear shaft, an output gear shaft and a plurality of transition gears. The transition gears are sequentially connected between the input gear shaft and the output gear shaft in a meshed mode so that torsion of the input gear shaft can be transmitted to the output gear shaft, and therefore screw installation can be carried out in a narrow space. The input gear shaft is connected with the output shaft of the electric screw driver, the input gear shaft transmits acting force to the output gear shaft through the transition gears, the spiral tooth parallel structure is adopted to increase the transmission meshing contact ratio, then the variable quantity of output torque is reduced, the torsion and stability of the screw driver are improved, and therefore the working efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of screwdrivers, in particular to an electric screwdriver adapter. Background Art

[0002] In the structural design of electronic appliances, telecommunications appliances, mechanical products, the automotive industry, and aerospace components, screws or rivets are the most common means of connection. Therefore, tightening screws or rivets has become a fundamental operation in the assembly of these products. As we all know, the use of manual screwdrivers in previous assembly processes was a primitive manual operation. With technological advances, automatic screwdrivers were invented to adapt to mass production and mechanized operation. The emergence of these tools has played a positive role in improving production efficiency and reducing labor intensity. Automatic screwdrivers, an essential tool for most manufacturers, are generally divided into three categories: straight-handled, handheld, and mounted.

[0003] Existing electric screwdrivers primarily come in two types: straight-shaft and right-angle adapter. With the continuous introduction of various new precision products, certain applications require electric screwdrivers with narrow vertical clearances above screws, necessitating parallel adapters for screw installation. Existing parallel adapters suffer from significant torque output variability and low efficiency. This torque variability often prevents screw tightening torque from meeting the required range, reducing work efficiency.

[0004] Therefore, it is necessary to provide an electric screwdriver adapter to solve the above problems. Utility Model Content

[0005] The utility model relates to an electric screwdriver adapter. This adapter transmits the torque of the electric screwdriver to the screwdriver itself by disposing a transmission module between the input and output gear boxes, thereby facilitating screw installation in confined spaces. The input pinion is connected to the output shaft of the electric screwdriver, which transmits the applied force to the output pinion via a number of transition gears. The parallel structure of the helical teeth increases the degree of transmission meshing overlap, thereby minimizing the variation in output torque. This improves the torque and stability of the screwdriver, thereby enhancing work efficiency. This adapter addresses the problem of insufficient output torque and resulting low work efficiency in prior art parallel adapters.

[0006] To solve the above problems, the present invention provides an electric screwdriver adapter, comprising:

[0007] An input gear box, wherein an input gear shaft connected to the output shaft of the electric screwdriver is rotatably provided in the input gear box;

[0008] An output gear box, wherein the input gear box is snap-fitted with the output gear box to form a closed chamber; an output gear shaft connected to the screwdriver head is rotatably provided in the output gear box; and

[0009] A transmission module is located in the chamber; the transmission module includes the input gear shaft, the output gear shaft and a plurality of transition gears; the plurality of transition gears are sequentially meshed and connected between the input gear shaft and the output gear shaft, the input gear shaft is meshed and connected with adjacent transition gears, and the output gear shaft is meshed and connected with adjacent transition gears, so that the torque of the input gear shaft is transmitted to the output gear shaft.

[0010] Furthermore, the input gear shaft, the output gear shaft and the plurality of transition gears are all configured as columnar structures, and their central axes are all arranged in parallel in the same plane, which can increase the degree of engagement between two adjacent gears, thereby improving the stability of the transmission.

[0011] Furthermore, the input and output gear shafts, as well as the circumferences of several transition gears, are all configured as helical gears. The helical directions of the input and output gear shafts, as well as those of adjacent transition gears, are opposite, and the helical gears of two adjacent transition gears have opposite helical directions and the same number of teeth. The non-standard design of the helical gears improves transmission efficiency.

[0012] Furthermore, the input gear shaft and the output gear shaft are provided with the same number of gears, so that the overall transmission ratio is 1:1, which makes the output torque more stable and the control accuracy higher.

[0013] Furthermore, the inner sidewall of the input gear box is provided with a plurality of first mounting holes spaced apart in a straight line, and the inner sidewall of the output gear box is provided with a plurality of second mounting holes spaced apart in a straight line. The input gear shaft, each transition gear, and the output gear shaft are each positioned between a first mounting hole and a second mounting hole, facilitating installation and disassembly and improving assembly efficiency. The transmission module also includes a plurality of deep groove ball bearings. One deep groove ball bearing is provided at each end of the input gear shaft, each transition gear, and the output gear shaft, and each deep groove ball bearing is positioned in the corresponding first or second mounting hole to improve transmission efficiency.

[0014] Furthermore, the transmission module includes multiple elastic members. One elastic member is provided at one end of each of the input gear shaft, each transition gear, and the output gear shaft. These elastic members are squeezed between the corresponding deep groove ball bearing and the inner sidewall of the first mounting hole, or between the corresponding deep groove ball bearing and the inner sidewall of the second mounting hole. When compressed, these elastic members generate a directional thrust that provides reliable preload for the deep groove ball bearings, enhancing their lifespan while offsetting the axial force generated during the helical gear transmission process.

[0015] Furthermore, the elastic members between the input gear shaft and the adjacent transition gear, between two adjacent transition gears, and between the output gear shaft and the adjacent transition gear are staggered, thereby saving costs.

[0016] Furthermore, the transmission module includes two support sleeves, one sleeve mounted on each end of the output gear shaft. One support sleeve is embedded in the input gear box, and the other in the output gear box. The output gear shaft utilizes these two support sleeves for radial support, improving installation stability.

[0017] Furthermore, one end of the output pinion, located within the input gear box, is provided with an axially open flat hole. A steel ball is positioned within the flat hole and is squeezed between the output pinion and the inner side of the input gear box. The point friction of the steel ball transmits axial force, reducing friction and thus minimizing torque variation on the output pinion.

[0018] Furthermore, the output side of the output gear box is provided with a plurality of threaded holes and a plurality of positioning pin holes for reserving the installation of external modules. The plurality of threaded holes and the plurality of positioning pin holes are arranged at intervals on both sides of the output side of the output gear box, which facilitates the installation of external modules and improves compatibility.

[0019] Due to the use of the above-mentioned electric screwdriver adapter, the present invention has the following advantages over the prior art: The present invention relates to an electric screwdriver adapter comprising an input gear box, an output gear box, and a transmission module. An input pinion, which is connected to the output shaft of the electric screwdriver, is rotatably disposed within the input gear box. The input gear box and the output gear box are interlocked to form a closed chamber. An output pinion, which is connected to the screwdriver head, is rotatably disposed within the output gear box. The transmission module is located within the chamber. The transmission module comprises an input pinion, an output pinion, and a plurality of transition gears. The plurality of transition gears are sequentially meshed between the input pinion and the output pinion, with the input pinion meshing with adjacent transition gears, and the output pinion meshing with adjacent transition gears, so that torque from the input pinion is transmitted to the output pinion. The transmission module is disposed between the input gear box and the output gear box to transmit torque from the electric screwdriver to the screwdriver, thereby enabling screw installation in confined spaces. The input gear shaft is connected to the output shaft of the electric screwdriver. The input gear shaft transmits the force to the output gear shaft through several transition gears. The helical tooth parallel structure increases the transmission meshing overlap, thereby reducing the change in output torque, improving the torque and stability of the screwdriver, thereby improving work efficiency, and solving the problem of low work efficiency caused by insufficient output torque in parallel adapter products in the existing technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. The drawings described below are only drawings corresponding to some embodiments of the present invention.

[0021] Figure 1 The figure is a schematic structural diagram of an embodiment of the electric screwdriver adapter of the present utility model.

[0022] Figure 2 This is a schematic structural diagram of an electric screwdriver adapter according to an embodiment of the present invention from another perspective.

[0023] Figure 3 The figure is a schematic diagram of the exploded structure of an embodiment of the electric screwdriver adapter of the present invention.

[0024] Figure 4 FIG2 is a schematic diagram of an exploded structure of an embodiment of the electric screwdriver adapter of the present invention from another perspective.

[0025] Figure 5 It is a top view of an embodiment of the electric screwdriver adapter of the present invention.

[0026] Figure 6 It is a bottom view of an embodiment of the electric screwdriver adapter of the present invention.

[0027] Figure 7 for Figure 6 Schematic diagram of the cross-sectional structure of AA.

[0028] Figure 8 for Figure 7 Enlarged schematic diagram of the local structure.

[0029] Figure 9 It is a plan view of an embodiment of the support sleeve molding on the output gear box of the electric screwdriver adapter of the present invention.

[0030] In the figure: 1. Electric screwdriver adapter; 2. Input gear box; 21. First mounting hole; 22. Third mounting hole; 3. Output gear box; 31. Second mounting hole; 32. Threaded hole; 33. Locating pin hole; 34. Locating pin; 35. Fixing screw; 41. Input gear shaft; 411. Special-shaped groove; 42. Output gear shaft; 421. Flat head hole; 43. Transition gear; 44. Deep groove ball bearing; 45. Gasket; 46. Elastic part; 47. Support sleeve; 48. Steel ball; 49. Wear-resistant gasket. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0032] Directional terms mentioned in this invention, such as "upper", "lower", "front", "back", "left", "right", "inside", "outside", "side", "top" and "bottom", are only used with reference to the directions of the drawings. The directional terms used are used to illustrate and understand the invention, and are not intended to limit the invention.

[0033] In the figures, structurally similar elements are denoted by the same reference numerals.

[0034] Please refer to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4In this embodiment, the electric screwdriver adapter 1 includes an input gear box 2, an output gear box 3 and a transmission module. An input gear shaft 41 connected to the output shaft of the electric screwdriver is rotatably provided in the input gear box 2. The input gear box 2 and the output gear box 3 are snap-fitted to form a closed chamber. An output gear shaft 42 connected to the screwdriver head is rotatably provided in the output gear box 3. The transmission module is located in the chamber. The transmission module includes an input gear shaft 41, an output gear shaft 42 and a plurality of transition gears 43. The plurality of transition gears 43 are all meshed and connected between the input gear shaft 41 and the output gear shaft 42 in sequence. The input gear shaft 41 is meshed and connected with the adjacent transition gear 43, and the output gear shaft 42 is meshed and connected with the adjacent transition gear 43, so that the torque of the input gear shaft 41 is transmitted to the output gear shaft 42.

[0035] In this embodiment, please refer to Figure 4 The input gear shaft 41, the output gear shaft 42 and the plurality of transition gears 43 are all configured as columnar structures, and their central axes are all arranged parallel in the same plane, which can increase the meshing degree between two adjacent gears, thereby improving the stability of the transmission.

[0036] Specifically, the input gear shaft 41, the output gear shaft 42, and the circumference of several transition gears 43 are all configured as helical gears. The helical directions of the input gear shaft 41 and adjacent transition gears 43, as well as the output gear shaft 42 and adjacent transition gears 43, are all opposite. The helical gears of two adjacent transition gears 43 have opposite helical directions and the same number of teeth. The non-standard design of the helical gears improves transmission efficiency.

[0037] The input pinion 41 and output pinion 42 have the same number of gears, achieving an overall transmission ratio of 1:1. This ensures more stable output torque, higher control precision, and maintains output torque variation within 5%. The number of transition gears 43 can be adjusted based on the required design. When there is an odd number of transition gears 43, the input pinion 41 and output pinion 42 have the same rotation direction.

[0038] Please refer to Figure 3 、 Figure 4 、 Figure 7 The inner wall of the input gear box 2 is provided with a plurality of first mounting holes 21 spaced apart in a straight line, and the inner wall of the output gear box 3 is provided with a plurality of second mounting holes 31 spaced apart in a straight line. The input gear shaft 41, each transition gear 43, and the output gear shaft 42 are each positioned between a first mounting hole 21 and a second mounting hole 31, facilitating installation and removal and improving assembly efficiency.

[0039] Please refer to Figure 4 、 Figure 7The transmission module also includes multiple deep groove ball bearings 44. A deep groove ball bearing 44 is provided at both ends of the input gear shaft 41, each transition gear 43, and the output gear shaft 42. The deep groove ball bearings 44 are disposed in the corresponding first mounting hole 21 or second mounting hole 31 to improve transmission efficiency.

[0040] Specifically, a gasket 45 is firstly sleeved on both ends of the transition gear 43 , and then the deep groove ball bearings 44 are sleeved on the ends accordingly.

[0041] Please refer to Figure 4 、 Figure 6 、 Figure 7 、 Figure 8 The transmission module also includes multiple elastic members 46. An elastic member 46 is positioned at one end of each input gear shaft 41, each transition gear 43, and the output gear shaft 42. These elastic members 46 are squeezed between the corresponding deep groove ball bearing 44 and the inner sidewall of the first mounting hole 21, or between the corresponding deep groove ball bearing 44 and the inner sidewall of the second mounting hole 31. When compressed, these elastic members 46 generate a directional thrust that provides a reliable preload for the deep groove ball bearing 44, enhancing its lifespan while also offsetting the axial force generated during the helical gear transmission process.

[0042] The elastic member 46 is preferably an O-ring. The transmission module uses an O-ring as a preload spring for the deep groove ball bearing 44. The O-ring is made of rubber or silicone and is not limited to an O-ring structure. It can also be an elastic rubber sheet or a standard corrugated spring.

[0043] The specific distribution of the elastic members 46 is determined based on the rotational direction of the helical gears. The elastic members 46 are staggered between the input gear shaft 41 and the adjacent transition gear 43, between two adjacent transition gears 43, and between the output gear shaft 42 and the adjacent transition gear 43 to determine the corresponding axial force-bearing ends. Consequently, the elastic members 46 are positioned at the ends of the bearing ends, saving costs.

[0044] The ends of the input gear box 2 and the output gear box 3 on the input side are both configured as arc structures, and the ends of the input gear box 2 and the output gear box 3 on the output side are both configured as conical structures. Figure 6 、 Figure 7 、 Figure 9To reduce the size of the output side of the output gear box 3 while ensuring adequate support and achieving an extremely narrow margin, the transmission module also includes two support sleeves 47, one sleeved at each end of the output gear shaft 42. One support sleeve 47 is embedded within the input gear box 2 and located at the tapered end, while the other support sleeve 47 is embedded within the output gear box 3. The output gear shaft 42 uses two support sleeves 47 for radial support, improving installation stability. Furthermore, the support sleeves 47 increase the rigidity of the input gear box 2 and the output gear box 3 on the output side, thereby reducing the margin between the housing and the output shaft, reducing the overall size, and increasing the scope of application.

[0045] For details, please refer to Figure 7 、 Figure 9 The support sleeve 47 is configured as a copper alloy bearing structure. The copper alloy bearings are respectively embedded in the two gear boxes. To ensure sufficient positioning accuracy between the copper alloy bearings and the gear boxes, the copper alloy blank is first embedded, and then the first mounting hole 21 is added while the inner hole and end face of the copper alloy bearing are processed.

[0046] Among them, copper alloy bearings are machined integrally after being embedded in the housing to ensure accuracy. However, this is not limited to using finished products and then pressing them in, or replacing them with deep groove ball bearings 44 to meet the extremely narrow margin requirements.

[0047] One end of the output gear shaft 42, located within the input gear box 2, is provided with an axially open flat hole 421. A steel ball 48 is positioned within this flat hole 421 and is squeezed between the output gear shaft 42 and the inner side of the input gear box 2. The point friction of the steel ball 48 absorbs the axial force generated by tightening the screws, reducing friction and, therefore, the torque variation of the output gear shaft 42.

[0048] To enhance the rigidity of the connection, a wear-resistant washer 49 can be placed in the flat hole 421. The end of the steel ball 48, facing away from the output pinion 42, creates a point friction with the wear-resistant washer 49. During operation, the wear-resistant washer 49 absorbs the axial force exerted by the output pinion 42. A washer 45 is fitted over the lower end of the output pinion 42 to adjust the axial clearance.

[0049] In this embodiment, the output side of the output gear box 3 is provided with a plurality of threaded holes 32 and a plurality of positioning pin holes 33 for reserving the installation of external modules. The plurality of threaded holes 32 and the plurality of positioning pin holes 33 are arranged at intervals on both sides of the output side of the output gear box 3, which facilitates the installation of external modules and improves compatibility.

[0050] Both the input gear box 2 and the output gear box 3 are equipped with locating pin holes 33 for mounting locating pins 34, facilitating quick alignment. Then, by tightening the fixing screws 35, a self-contained screwdriver adapter is formed. The screwdriver's torque is transmitted from the input pinion 41 of the input gear box 2 through the multi-layered transition gears 43 to the output pinion 42, where it is output to the screwdriver in the direction of the output gear box 3.

[0051] Please refer to Figure 5 The input side of the input gear box 2 features three third mounting holes 22 for mounting an electric screwdriver or a direct-connected motor, facilitating easy installation and removal. The input gear shaft 41 utilizes a special-shaped slot 411 for inserting an electric screwdriver or direct-connected motor. The special-shaped slot 411 can be a slotted, square, or hexagonal slot, among other options. The output gear shaft 42 utilizes a shaft output. The output shaft of the output gear shaft 42 can also be configured with a special-shaped slot 411 for attaching a screwdriver bit or a flat shaft, depending on actual usage requirements.

[0052] During operation, the output shaft of the electric screwdriver is inserted into the special-shaped slot 411 and connected to the input pinion 41. The output pinion 42 protrudes from the output gear box 3 and connects to the screwdriver head. The electric screwdriver drives the input pinion 41 to rotate, which in turn drives several transition gears 43 and the output pinion 42 to rotate together. The output pinion 42 transmits torque to the screwdriver head, enabling the screwdriver head to tighten the screw. As the output pinion 42 rotates, the end away from the screwdriver head creates point friction with the wear-resistant gasket 49 via the steel ball 48. This absorbs the axial force generated by tightening the screw, reducing friction and thus minimizing the torque variation of the output pinion 42.

[0053] In this embodiment, the utility model relates to an electric screwdriver adapter, which includes an input gear box, an output gear box and a transmission module. An input gear shaft connected to the output shaft of the electric screwdriver is rotatably provided in the input gear box. The input gear box and the output gear box are snap-fitted to form a closed chamber. An output gear shaft connected to the screwdriver head is rotatably provided in the output gear box. The transmission module is located in the chamber. The transmission module includes an input gear shaft, an output gear shaft and a plurality of transition gears. The plurality of transition gears are meshed and connected between the input gear shaft and the output gear shaft in sequence, the input gear shaft is meshed and connected with adjacent transition gears, and the output gear shaft is meshed and connected with adjacent transition gears, so that the torque of the input gear shaft is transmitted to the output gear shaft. A transmission module is provided between the input gear box and the output gear box to transmit the torque of the electric screwdriver to the screwdriver, so that screw installation can be performed in a narrow space. The input gear shaft is connected to the output shaft of the electric screwdriver. The input gear shaft transmits the force to the output gear shaft through several transition gears. The helical tooth parallel structure increases the transmission meshing overlap, thereby reducing the change in output torque, improving the torque and stability of the screwdriver, thereby improving work efficiency, and solving the problem of low work efficiency caused by insufficient output torque in parallel adapter products in the existing technology.

[0054] In summary, although the present invention has been disclosed above with reference to preferred embodiments, the above preferred embodiments are not intended to limit the present invention. A person skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined by the claims.

Claims

1. An electric screwdriver adapter, characterized in that: include: An input gear box, wherein an input gear shaft connected to the output shaft of the electric screwdriver is rotatably provided in the input gear box; An output gear box, wherein the input gear box is snap-fitted with the output gear box to form a closed chamber; an output gear shaft connected to the screwdriver head is rotatably provided in the output gear box; and A transmission module is located in the chamber; the transmission module includes the input gear shaft, the output gear shaft and a plurality of transition gears; the plurality of transition gears are sequentially meshed and connected between the input gear shaft and the output gear shaft, the input gear shaft is meshed and connected with adjacent transition gears, and the output gear shaft is meshed and connected with adjacent transition gears, so that the torque of the input gear shaft is transmitted to the output gear shaft.

2. The electric screwdriver adapter according to claim 1, characterized in that: The input gear shaft, the output gear shaft and the plurality of transition gears are all arranged as columnar structures, and the central axes thereof are all arranged in parallel in the same plane.

3. The electric screwdriver adapter according to claim 2, characterized in that: The circumferential sides of the input gear shaft, the output gear shaft and several of the transition gears are all set as helical gears; the spiral directions of the input gear shaft and the adjacent transition gears, and the output gear shaft and the adjacent transition gears are all set in opposite directions, and the spiral directions of the helical gears of two adjacent transition gears are opposite and the number of teeth is the same.

4. The electric screwdriver adapter according to claim 3, characterized in that: The input gear shaft and the output gear shaft are provided with the same number of gears.

5. The electric screwdriver adapter according to claim 1, characterized in that: The inner side wall of the input gear box is provided with a plurality of first mounting holes distributed in a linear interval, and the inner side wall of the output gear box is provided with a plurality of second mounting holes distributed in a linear interval, and the input gear shaft, each of the transition gears, and the output gear shaft are correspondingly arranged between one of the first mounting holes and one of the second mounting holes; the transmission module also includes a plurality of deep groove ball bearings; one of the deep groove ball bearings is provided at both ends of the input gear shaft, each of the transition gears, and the output gear shaft, and the deep groove ball bearings are arranged in the corresponding first mounting hole or second mounting hole.

6. The electric screwdriver adapter according to claim 5, characterized in that: The transmission module also includes multiple elastic parts; one end of the input gear shaft, each transition gear, and the output gear shaft is correspondingly provided with an elastic part, and the elastic part is squeezed between the corresponding deep groove ball bearing and the inner side wall of the first mounting hole or between the corresponding deep groove ball bearing and the inner side wall of the second mounting hole.

7. The electric screwdriver adapter according to claim 6, characterized in that: The elastic members between the input gear shaft and the adjacent transition gear, between two adjacent transition gears, and between the output gear shaft and the adjacent transition gear are staggered.

8. The electric screwdriver adapter according to claim 1, characterized in that: The transmission module further includes two supporting shaft sleeves, each of which is sleeved with one supporting shaft sleeve at both ends of the output gear shaft; one supporting shaft sleeve is pre-buried in the input gear box, and the other supporting shaft sleeve is pre-buried in the output gear box.

9. The electric screwdriver adapter according to claim 6, characterized in that: One end of the output gear shaft located in the input gear box is provided with an axially opened flat head hole, a steel ball is provided in the flat head hole, and the steel ball is squeezed and connected between the output gear shaft and the inner side of the input gear box.

10. The electric screwdriver adapter according to claim 1, characterized in that: The output side of the output gear box is provided with a plurality of threaded holes and a plurality of positioning pin holes for reserving external module installation, and the plurality of threaded holes and the plurality of positioning pin holes are spaced apart and arranged on both sides of the output side of the output gear box.

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