Torsion screwdriver device
Through the design of the shaft sleeve and clutch assembly, the torque screwdriver device achieves high-precision torque control and long life, solves the problems of insufficient torque control accuracy and short life in existing devices, and is easy to maintain.
Patent Information
- Application Number
- CN202422712858.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-07
- Publication Date
- 2025-09-19
- Estimated Expiration
- 2034-11-07
AI Technical Summary
Existing torque screwdriver devices have poor torque control accuracy and short product life, and cannot meet the requirements of high precision and long life.
The design of the shaft sleeve and clutch assembly is adopted to achieve torque control through the shaft sleeve and clutch assembly, ensuring that the torque control accuracy is within plus or minus 5%, and the design of the shaft sleeve and inner ring makes it easy to disassemble and maintain.
The torque control accuracy has been improved to within plus or minus 5%, the product life has reached 100,000 times, and the device can be easily disassembled and maintained.
Smart Images
Figure CN223354148U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a torque screwdriver device, in particular to a torque screwdriver device used for tightening or loosening a spiral fastener. Background Art
[0002] Torque screwdrivers typically provide a torque control mechanism, which causes the device to spin when the torque reaches a certain limit. This mechanism protects the internal structure of the device, the screwdriver bit, and the screw fastener. However, existing torque screwdrivers, such as Taiwan Invention Patent No. 457172, rely on springs to control the torque limit. This results in a complex structure, poor torque control accuracy (approximately ±10%), and a relatively short lifespan (approximately 5,000 uses). Consequently, current torque screwdrivers present numerous shortcomings for users. Utility Model Content
[0003] The purpose of the utility model is to provide a torque screwdriver device with higher torque control accuracy and longer product life.
[0004] To achieve the above objectives, the present invention provides a torque screwdriver device comprising a housing, an input shaft, an output shaft, a sleeve, and a clutch assembly. The housing comprises a first accommodating space. The input shaft comprises a second accommodating space, including a connecting portion and an assembly portion. The connecting portion is fixedly attached to the housing, the second accommodating space communicates with the first accommodating space, and the assembly portion is configured for assembly with a rotating tool. The output shaft comprises a sleeve portion and a shaft portion, the shaft portion being inserted into the first accommodating space. The sleeve is fixedly attached to the first accommodating space and sleeved onto the shaft portion with an interference fit. The clutch assembly is disposed within the second accommodating space and comprises a first cam, a second cam, and an elastic member. One surface of the first cam is fixedly attached to the end of the shaft portion. The other surface of the first cam is provided with a first one-way face gear. The other surface of the second cam is provided with a second one-way face gear corresponding to the first one-way face gear. The other surface of the second cam abuts one end of the elastic member, the other end of which abuts the bottom wall of the second accommodating space. The second cam is slidably but non-rotatably disposed within the second accommodating space.
[0005] In one embodiment of the present invention, the housing includes a barrel and a cover member connected to the barrel. A first stopper is provided on the inner circumferential wall of the barrel, and a second stopper is provided on the outer circumferential wall of the sleeve portion of the output shaft. The first stopper and the second stopper mutually stop the sleeve portion of the output shaft so as to be confined within the first accommodating space.
[0006] In one embodiment of the present invention, a first groove is formed on the outer peripheral wall of the barrel, and a second groove is formed on the outer peripheral wall of the connecting portion of the input shaft. The second groove communicates with the first groove when the connecting portion is connected to the barrel. The torque screwdriver device further includes a square key disposed in the communicating first and second grooves to secure the connecting portion to the housing.
[0007] In one embodiment of the present invention, the housing further comprises an inner ring member fixedly disposed in the first accommodating space, wherein the inner ring member is provided with a guide groove, and the shaft sleeve is provided with an inserting portion, which is inserted into the guide groove to fix the shaft sleeve in the first accommodating space.
[0008] In one embodiment of the present invention, the inner ring is provided with a first positioning hole, the connecting portion of the input shaft is provided with a second positioning hole, and the torque screwdriver device further includes a positioning post that is inserted into the first positioning hole and the second positioning hole to secure the inner ring in the first accommodating space.
[0009] In one embodiment of the present invention, the shaft sleeve includes a plurality of washer-shaped shaft sleeves, each of which has an inner hole corresponding to the diameter of the shaft portion, a spring notch at one end, and an insert at the other opposite end, the inserts of the washer-shaped shaft sleeves forming the inserting portion of the shaft sleeve.
[0010] In one embodiment of the present invention, the torque screwdriver device further includes a ball bearing, which is pivotally mounted on the shaft and located between the sleeve portion and the inner ring.
[0011] In one embodiment of the present invention, the torque screwdriver device further includes a magnet, which is fixed in the sleeve portion.
[0012] In one embodiment of the present invention, the shaft portion includes a circular shaft segment and a non-circular shaft segment at its end, the sleeve being sleeved over the circular shaft segment with an interference fit. A first cam has a slotted hole on one side, and the non-circular shaft segment is snap-fitted into the slotted hole to securely connect one side of the first cam to the end of the shaft portion.
[0013] In one embodiment of the present invention, the second accommodating space includes a first circular hole segment, a second circular hole segment, and a non-circular hole segment located between the first and second circular hole segments. The second cam includes a first cylindrical segment, a second cylindrical segment, and a non-circular hole segment located between the first and second cylindrical segments. A second one-way face gear is disposed at the end of the first cylindrical segment. The first cylindrical segment, the second cylindrical segment, and the non-circular hole segment of the second accommodating space are respectively located within the first circular hole segment, the second circular hole segment, and the non-circular hole segment of the second accommodating space, such that the second cam is slidably but non-rotatably disposed within the second accommodating space.
[0014] According to the torque screwdriver device of the embodiment of the present invention, a torque control mechanism is realized by a shaft sleeve and a clutch assembly, that is, when the torsional force reaches the limit of the torque screwdriver device, the torque screwdriver device will produce an idling phenomenon, thereby protecting the internal structure of the torque screwdriver device, the screwdriver head and the spiral fastener of the torque screwdriver device. The torque limit value is controlled by the shaft sleeve, so that the overall torque control accuracy is within plus or minus 5%, and the product life reaches 100,000 times, that is, it has higher torque control accuracy and longer product life. In addition, the outer shell includes a barrel, a cover connected to the barrel, and an inner ring member arranged in the barrel, the shaft sleeve is plugged and fixed in the inner ring member, and the input shaft, the inner ring member and the outer barrel are fixed to each other through a positioning column and a square key. Such a design makes it easy to disassemble and repair the torque screwdriver device.
[0015] In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below with reference to the accompanying drawings for detailed description. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 This is a three-dimensional diagram of a torque screwdriver device according to an embodiment of the present invention.
[0017] Figure 2 for Figure 1 Exploded view of the torque driver assembly shown.
[0018] Figure 3 for Figure 2 A cross-sectional view of the housing and input shaft and a perspective view of the second cam are shown.
[0019] Figure 4 for Figure 2 Partially exploded view of the bushing shown.
[0020] Figures 5A to 5C for Figure 1 The shown planar cross-sectional views of the torque screwdriver device in different states.
[0021] Figures 6A to 6C They are Figures 5A to 5C A perspective cutaway view of the torque screwdriver device shown. DETAILED DESCRIPTION
[0022] In the following embodiments, the same or similar reference numerals represent the same or similar components. In addition, the directional terms mentioned in the following embodiments, such as up, down, left, right, front, or back, are only used to refer to the directions in the accompanying drawings. Therefore, the directional terms used are for illustration and are not intended to limit the present invention.
[0023] Please also refer to Figures 1 to 4 , Figure 1 This is a three-dimensional diagram of a torque screwdriver device 1 according to an embodiment of the present invention. Figure 2for Figure 1 The exploded view of the torque screwdriver device 1 is shown. Figure 3 for Figure 2 The cross-sectional view of the housing 10 and the input shaft 20 and the perspective view of the second cam 52 are shown. Figure 4 for Figure 2 The illustrated partial exploded view of the sleeve 40. The various components and the installation method of the torque screwdriver device 1 are first described below.
[0024] The torque driver device 1 includes a housing 10, an input shaft 20, an output shaft 30, a sleeve 40, and a clutch assembly 50. The housing 10 defines a first accommodating space 100. The input shaft 20 defines a second accommodating space 200. The input shaft 20 includes a connecting portion 21 and an assembly portion 22. The connecting portion 21 is fixedly attached to the housing 10, and the second accommodating space 200 communicates with the first accommodating space 100. The assembly portion 22 is configured for assembly with a rotating tool. The output shaft 30 includes a sleeve portion 31 and a shaft portion 32. The sleeve portion 31 is configured for receiving a screwdriver bit, and the shaft portion 32 is disposed within the first accommodating space 100. The sleeve 40 is fixedly disposed within the first accommodating space 100 and sleeves onto the shaft portion 32 with an interference fit. The clutch assembly 50 is arranged in the second accommodating space 200. The clutch assembly 50 includes a first cam 51, a second cam 52 and an elastic member 53. One side of the first cam 51 is fixed to the end of the shaft portion 32, and the other side of the first cam 51 is provided with a first one-way face gear 511. One side of the second cam 52 is provided with a second one-way face gear 524 corresponding to the first one-way face gear 511. The other side of the second cam 52 is abutted against one end of the elastic member 53, and the other end of the elastic member 53 is abutted against the bottom wall of the second accommodating space 200. The second cam 52 is slidably but not rotatably arranged in the second accommodating space 200.
[0025] In this embodiment, the housing 10 includes a barrel 11 and a cover 12 connected to the barrel 11. A first stopper 111 is provided on the inner circumferential wall of the barrel 11, and a second stopper 311 is provided on the outer circumferential wall of the sleeve portion 31 of the output shaft 30. The first stopper 111 and the second stopper 311 engage each other to restrict the sleeve portion 31 of the output shaft 30 to be located within the first accommodating space 100, thereby controlling the position of the sleeve portion 31 of the output shaft 30 within the first accommodating space 100.
[0026] In this embodiment, the outer circumferential wall of the barrel 11 is provided with a first groove 112, and the outer circumferential wall of the connecting portion 21 of the input shaft 20 is provided with a second groove 211. The second groove 211 communicates with the first groove 112 when the connecting portion 21 is connected to the barrel 11. The torque screwdriver device 1 also includes a square key 60, which is provided in the communicating first groove 112 and second groove 211 to secure the connecting portion 21 to the housing 10. In this document, "component A is secured to component B," or "component A is secured to component B," simply means that components A and B move together. The secured components A and B can be designed to be detachable or non-detachable. Because the connecting portion 21 of the input shaft 20 is secured to the housing 10, the input shaft 20 and the housing 10 move together.
[0027] In this embodiment, the housing 10 further includes an inner ring 13, which is fixedly disposed within the first accommodating space 100 and has a guide groove 131 defined therein. The sleeve 40 includes an inserting portion 41, which engages with the guide groove 131 to secure the sleeve 40 within the first accommodating space 100. Because the sleeve 40 is fixedly disposed within the first accommodating space 100 of the housing 10, it moves in unison with the housing 10.
[0028] In this embodiment, the inner ring 13 is provided with a first positioning hole 132, and the connecting portion 21 of the input shaft 20 is provided with a second positioning hole 212. The torque screwdriver device 1 further includes a positioning post 70, which is inserted into the first positioning hole 132 and the second positioning hole 212 to secure the inner ring 13 to the input shaft 20. The inner ring 13 is then secured within the first accommodating space 100 of the housing 10 by securing the connecting portion 21 of the input shaft 20 to the housing 10.
[0029] In this embodiment, the sleeve 40 includes a plurality of shim-like shaft sleeves 40'. Each shim-like shaft sleeve 40' has an inner hole 42' sized to match the diameter of the shaft portion 32 of the output shaft 30, a resilient notch 43' at one end, and an insert 41' at the opposite end. The inserts 41' of these shim-like shaft sleeves 40' form the inserting portion 41 of the sleeve 40. By adjusting the number of shim-like shaft sleeves 40' stacked, the friction applied by the sleeve 40 to the shaft portion 32 of the output shaft 30 can be precisely controlled, thereby precisely controlling the torque limit at which the torque driver device will experience lost motion, for example, to achieve an overall torque control accuracy within plus or minus 5%.
[0030] In this embodiment, the torque driver device further includes a ball bearing 80 and a magnet 90. The ball bearing 80 is pivotally mounted on the shaft portion 32 of the output shaft 30 and positioned between the sleeve portion 31 and the inner ring 13. The ball bearing 80 is used to withstand downward pressure from the inner ring 13 and facilitate rotation of the inner ring 13. The magnet 90 is fixed within the sleeve portion 31 of the output shaft 30. When the sleeve portion 31 is attached to a screwdriver bit, the magnet 90 magnetically attracts the screwdriver bit, preventing it from falling off.
[0031] In this embodiment, the shaft portion 32 of the output shaft 30 comprises a circular shaft segment 321 and a non-circular shaft segment 322 at its end. The sleeve 40 is sleeved over the circular shaft segment 321 with an interference fit. A first cam 51 has a slot 512 defined on one side. The non-circular shaft segment 322 is snap-fitted into the slot 512, securing one side of the first cam 51 to the end of the shaft portion 32. Because the first cam 51 is secured to the end of the shaft portion 32, it moves in unison with the output shaft 30.
[0032] In this embodiment, the second accommodating space 200 of the input shaft 20 includes a first circular hole segment 201, a second circular hole segment 202, and a non-circular hole segment 203 located between the first and second circular hole segments 201 and 202. The second cam 52 includes a first cylindrical segment 521, a second cylindrical segment 522, and a non-circular hole segment 523 located between the first and second cylindrical segments 521 and 522. A second one-way face gear 524 is disposed at the end of the first cylindrical segment 521. The first cylindrical segment 521, the second cylindrical segment 522, and the non-circular hole segment 523 of the second accommodating space 200 are respectively located within the first, second, and non-circular hole segments 201, 202, and 203 of the second accommodating space 200, such that the second cam 52 is slidably but non-rotatably disposed within the second accommodating space 200 of the input shaft 20. In other words, the second cam 52 moves in unison with the input shaft 20 and can slide within the input shaft 20 when needed.
[0033] As can be seen from the above, the housing 10 (including the barrel 11, the cover 12 and the inner ring 13), the input shaft 20, the sleeve 40 and the second cam 52 move together. In addition, the output shaft 30 and the first cam 51 move together.
[0034] Please also see Figures 5A to 5C and Figures 6A to 6C , Figures 5A to 5C for Figure 1 The torque screwdriver device 1 is shown in a planar cross-sectional view in different states. Figures 6A to 6C They are Figures 5A to 5C The three-dimensional cross-sectional view of the torque screwdriver device 1 is shown in FIG. Figures 6A to 6C In the three-dimensional cross-sectional view, the first cam 51, the second cam 52 and the elastic member 53 are completely presented without being cut. Next, the operation mode of the torque screwdriver device 1 will be described.
[0035] Please see first Figure 5A and Figure 6AWhen using the torque driver device 1 to tighten a screw fastener and the torque limit has not been exceeded, the rotating tool drives the input shaft 20 to rotate in a first rotational direction R1. The input shaft 20 drives the housing 10 (including the barrel 11, cover 12, and inner ring 13), the sleeve 40, and the second cam 52 to rotate simultaneously. The frictional force exerted by the sleeve 40 on the shaft portion 32 drives the output shaft 30 and the first cam 51 to rotate. The output shaft 30, in turn, drives the screwdriver bit attached to it to tighten the screw fastener. At this point, the entire structure of the torque driver device 1 moves simultaneously.
[0036] Please refer to Figure 5B and Figure 6B When the torque screwdriver device 1 is used to tighten the screw fastener and exceeds the torque limit, the torque on the output shaft 30 exceeds the friction provided by the sleeve 40, causing the sleeve 40 to spin idly and unable to drive the output shaft 30 to rotate. As a result, the output shaft 30 and the first cam 51 no longer rotate. At this point, only the input shaft 20 of the torque screwdriver device 1 drives the housing 10 (including the barrel 11, cover 12, and inner ring 13), the sleeve 40, and the second cam 52 to move simultaneously, causing the rotating second cam 52 to open and close with the non-rotating first cam 51. That is, the second cam 52 slides upward within the input shaft 20, away from the first cam 51, and then returns to engage with the first cam 51 due to the elastic member 53. This produces a clashing sound during opening and closing.
[0037] Last read Figure 5C and Figure 6C When using the torque driver device 1 to loosen a screw fastener, the rotating tool drives the input shaft 20 to rotate in the second rotational direction R2. The input shaft 20 drives the housing 10 (including the barrel 11, cover 12, and inner ring 13), the sleeve 40, and the second cam 52 to move simultaneously. Due to the one-way face gear, the second cam 52 engages with the first cam 51 and moves simultaneously. The first cam 51 then drives the output shaft 30, causing the screwdriver bit attached thereto to rotate in the second rotational direction R2, loosening the screw fastener. At this point, the entire structure of the torque driver device 1 moves simultaneously.
[0038] Although the present invention has been disclosed above with reference to preferred embodiments, they are not intended to limit the present invention. Any person skilled in the art may make slight 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 determined by the claims.
Claims
1. A torque screwdriver device, characterized in that include: The housing has a first accommodating space; An input shaft having a second accommodating space, the input shaft including a connecting portion and an assembly portion, the connecting portion being fixedly connected to the housing, the second accommodating space being in communication with the first accommodating space, and the assembly portion being for assembly with a rotating tool; an output shaft, comprising a sleeve portion and a shaft portion, wherein the shaft portion is disposed in the first accommodating space; a shaft sleeve, fixedly disposed in the first accommodating space, the shaft sleeve being sleeved on the shaft portion with an interference fit; and A clutch assembly is arranged in the second accommodating space, and the clutch assembly includes a first cam, a second cam and an elastic member. One side of the first cam is fixed to the end of the shaft portion, and the other side of the first cam is provided with a first one-way face gear. One side of the second cam is provided with a second one-way face gear corresponding to the first one-way face gear. The other side of the second cam abuts against one end of the elastic member, and the other end of the elastic member abuts against the bottom wall of the second accommodating space. The second cam is slidably but not rotatably arranged in the second accommodating space.
2. The torque screwdriver device according to claim 1, wherein: The outer shell includes a cylinder body and a cover connected to the cylinder body. The inner peripheral wall of the cylinder body is provided with a first stop portion, and the outer peripheral wall of the sleeve portion of the output shaft is provided with a second stop portion. The sleeve portion of the output shaft is limited to the first accommodating space by the mutual stopping of the first stop portion and the second stop portion.
3. The torque screwdriver device according to claim 2, wherein: The outer peripheral wall of the barrel is provided with a first groove, and the outer peripheral wall of the connecting portion of the input shaft is provided with a second groove, and the second groove is connected to the first groove when the connecting portion is connected to the barrel. The torque screwdriver device also includes a square key, and the square key is provided in the connected first groove and the second groove to fix the connecting portion to the outer shell.
4. The torque screwdriver device according to claim 3, wherein: The outer shell also includes an inner ring, which is fixed in the first accommodating space. A guide groove is provided in the inner ring, and the shaft sleeve is provided with an inserting portion, which is inserted into the guide groove to fix the shaft sleeve in the first accommodating space.
5. The torque screwdriver device according to claim 4, wherein: The inner ring is provided with a first positioning hole, the connecting portion of the input shaft is provided with a second positioning hole, and the torque screwdriver device further includes a positioning column, which is inserted into the first positioning hole and the second positioning hole to fix the inner ring in the first accommodating space.
6. The torque screwdriver device according to claim 4, wherein: The sleeve includes a plurality of gasket-shaped shaft sleeves, each of which is provided with an inner hole matching the diameter of the shaft portion, an elastic notch at one end, and an insert at the other opposite end. The inserts of the plurality of gasket-shaped shaft sleeves form the plug-in portion.
7. The torque screwdriver device according to claim 4, wherein: The torque screwdriver device further includes a ball bearing, which is pivotally mounted on the shaft portion and located between the sleeve portion and the inner ring member.
8. The torque screwdriver device according to claim 1, wherein: The torque screwdriver device further includes a magnet, which is fixed in the sleeve portion.
9. The torque screwdriver device according to claim 1, wherein: The shaft portion includes a circular shaft segment and a non-circular shaft segment at its end. The sleeve is sleeved on the circular shaft segment and has an interference fit. A slot is provided on one side of the first cam. The non-circular shaft segment is clamped in the slot so that one side of the first cam is fixed to the end of the shaft portion.
10. The torque screwdriver device according to claim 1, wherein: The second accommodating space includes a first circular hole segment, a second circular hole segment and a non-circular hole segment located between the first circular hole segment and the second circular hole segment. The second cam includes a first cylindrical segment, a second cylindrical segment and a non-cylindrical segment located between the first cylindrical segment and the second cylindrical segment. The end of the first cylindrical segment is provided with a second one-way face gear. The first cylindrical segment, the second cylindrical segment and the non-cylindrical segment of the second cam are respectively located in the first circular hole segment, the second circular hole segment and the non-circular hole segment of the second accommodating space so that the second cam can be slidably but not rotatably arranged in the second accommodating space.