Frictional torque control device
Patent Information
- Application Number
- CN202521593778.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-29
- Publication Date
- 2026-08-21
- Estimated Expiration
- 2035-07-29
AI Technical Summary
[0007]在紧固螺栓时，B端的六角内孔作为套筒套入要拧紧的螺栓，当A端连接动力源电动扳手旋转时，A端带动摩擦片A旋转，摩擦片A通过摩擦力带动摩擦片B旋转，摩擦片B带动B端旋转，B端带动螺栓旋转，当螺栓紧固到位时就会产生扭矩阻力, 当这个阻力大于摩擦片A和摩擦片B之间的扭矩阻力时，摩擦片A和摩擦片B出现滑动旋转，而这个滑动旋转的扭矩是我们预先设定好的，根据力与力相互的并且作用力与反作用力是相等的理论，这时作用在螺栓上的扭矩就是我们预先在摩擦式定扭矩控制装置上设定的扭矩值，从而达到定扭矩紧固螺栓的目的。
Smart Images
Figure CN224659303U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to torque control and protection in industrial production, automobile manufacturing, and engineering construction, such as the scenario of constant torque tightening of bolts. Specifically, it relates to a friction-type constant torque control device, which is a product that achieves high precision, high speed, high torque, impact resistance, and low cost operation. Background Technology
[0002] With the development of industrial production, there is a large amount of bolt tightening work to be done every day. The requirements for standardization, efficiency and low cost of bolt tightening are getting higher and higher. Manual torque wrenches are inefficient and have high labor costs. Electric torque wrenches that want to achieve high precision, high speed and high torque are not only expensive, but also heavy and inconvenient to carry. Although power impact wrenches on the market can achieve high torque and high speed, the torque cannot be precisely controlled.
[0003] The market urgently needs a torque control product that can achieve high precision, high speed, high torque, impact resistance, and low cost. This utility model can perfectly solve these problems through a friction-type constant torque control device, and can replace existing constant torque wrenches when used with ordinary impact wrenches on the market. Summary of the Invention
[0004] This invention addresses the challenges of torque control and nut torque overload in constant torque bolt tightening, achieving high precision, high speed, high torque, impact resistance, and low cost. The friction-type constant torque control device provides a simple structure, convenient operation, standardization, high efficiency, and high precision, high speed, high torque, impact resistance, and low cost. It controls torque by controlling the magnitude of frictional force, achieving a constant torque state where sliding friction rotation occurs at the calibrated torque without disappearing.
[0005] To achieve the above objectives, this utility model is a friction-type constant torque control device, which consists of end A, end B, a double-direction bearing, friction plate A, friction plate B, an elastic spring, a pressure plate, and a positioning screw. Friction plate A and friction plate B are made of materials that are friction-resistant, temperature-resistant, have a high coefficient of friction that remains stable at elevated temperatures, and possess a certain strength, such as ceramic fiber, carbon fiber, ductile iron, phosphor bronze, beryllium copper, diamond, asbestos, and novel composite materials. The elastic spring includes springs, disc springs, leaf springs, PTFE, rubber, and other elastic material products, serving as thrust compensation when the friction plates wear out. The double-direction bearing is a bearing with both radial and axial bidirectional bearing capacity, which can be purchased commercially or customized.
[0006] The principle is that an electric wrench is a common power output device on the market without torque control, characterized by high torque and high speed. When the square hole at end A of the friction-type constant torque control device is inserted into the square drive of the electric wrench and fixed, the electric wrench can drive end A to rotate. Friction plate A is installed inside end A, and end A is fixed and limited by a slot. Another friction plate B is installed at end B, and end B is also fixed and limited by a slot. A double-sided bearing is fitted into end B, and end B can only rotate under the restriction of the double-sided bearing. An elastic spring is fitted onto the double-sided bearing. The elastic spring is used to compensate for the pressure loss when friction plates A and B wear and become thinner during daily operation. The inner hole of the pressure plate passes through the double-sided bearing and matches the double-sided bearing. The pressure plate, through its threaded engagement with end A, generates pressure by rotating and acting on an elastic spring. The elastic spring then transmits the pressure to the double-sided bearing and end B, further amplifying the friction between friction plates A (mounted at end A) and B (mounted at end B). The magnitude of this friction can be controlled by tightening the pressure plate. Before use, the required torque is preset using a torque tester. The torque is adjusted by regulating the pressure of the pressure plate. The torque value displayed on the torque tester when friction plates A and B rotate and slide is the set torque value. Finally, the positioning screw is tightened to lock the pressure plate, preventing it from loosening or shifting under vibration conditions and ensuring stable torque.
[0007] When tightening the bolt, the hexagonal inner hole at end B acts as a sleeve to fit the bolt. When the electric wrench connected to the power source at end A rotates, end A drives friction plate A to rotate. Friction plate A drives friction plate B to rotate through friction, which in turn drives end B to rotate. End B then drives the bolt to rotate. When the bolt is tightened to the correct position, a torque resistance is generated. When this resistance is greater than the torque resistance between friction plates A and B, friction plates A and B begin to slide and rotate. The torque of this sliding rotation is preset. Based on the theory that forces are reciprocal and that action and reaction forces are equal, the torque acting on the bolt at this point is the torque value preset on the friction-type constant torque control device, thus achieving the purpose of tightening the bolt with constant torque. Attached Figure Description
[0008] Figure 1 This is a schematic diagram of the overall structure of a friction-type constant torque control device. Figure 2 This is a schematic cross-sectional view of the overall structure of the friction-type constant torque control device. Figure 3 A front view of the overall structure of the friction-type constant torque control device; Figure 4 A side-view schematic diagram of the overall structure of the friction-type constant torque control device; Figure 5This is a front view of one end of a friction-type constant torque control device. Figure 6 This is a schematic cross-sectional view of one end of a friction-type constant torque control device. Figure 7 This is a side view of one end of a friction-type constant torque control device. Figure 8 This is a side view of one end of a friction-type constant torque control device. Figure 9 This is a front view of the other end of the friction-type constant torque control device. Figure 10 This is a schematic cross-sectional view of the other end of the friction-type constant torque control device. Figure 11 This is a side view of the other end of the friction-type constant torque control device. Figure 12 This is a schematic diagram of the other end of the friction-type constant torque control device from an oblique side view. Figure 13 This is a schematic diagram of the oblique side of a double-sided bearing; Figure 14 This is a schematic diagram of friction plate A and friction plate B from an oblique side. Figure 15 This is a schematic diagram of the oblique side of the external thread pressure plate; Figure 16 A front view diagram of the bolt tightening operation; Figure 17 A schematic diagram of the oblique side view of the bolt tightening operation; Labeling explanation: 1. End A, 2. End B, 3. Double-sided bearing, 4. Friction plate A, 5. Friction plate B, 6. Elastic spring, 7. Pressure plate, 8. Positioning screw, 9. Electric wrench, 10. Bolt; Detailed Implementation
[0009] The present invention will now be described in detail with reference to the accompanying drawings and embodiments: This utility model is a friction-type constant torque control device, such as... Figure 1-4 As shown, it consists of end A 1, end B 2, double-sided bearing 3, friction plate A4, friction plate B5, elastic spring 6, pressure plate 7, and positioning screw 8. The friction plates A4 and B5 are made of materials that are wear-resistant, temperature-resistant, have a large and stable coefficient of friction when the temperature rises, and possess a certain strength, such as ceramic fiber, carbon fiber, ductile iron, phosphor bronze, beryllium copper, diamond, asbestos, and new composite materials. The elastic spring 6 includes springs, disc springs, leaf springs, PTFE, rubber, and other elastic material products, serving as thrust compensation when the friction plates are worn. The double-sided bearing 3 is a bearing with radial and axial bidirectional bearing capacity, which can be purchased from the market or customized.
[0010] Its principle is that the electric wrench 9 is a power output device with high torque and high speed, which is common in the market but lacks torque control, such as... Figure 1-17 As shown, when the square hole of end A1 of the friction-type constant torque control device is inserted into the square drive of the electric wrench 9 and fixed, the electric wrench 9 can drive end A1 to rotate. Friction plate A4 is installed into end A1, and end A1 is fixed by a retaining groove. Another friction plate B5 is installed in end B2, and end B2 is also fixed by a retaining groove. The double-sided bearing 3 is fitted into end B2, and end B2 can only rotate under the restriction of the double-sided bearing. An elastic spring 6 is fitted onto the double-sided bearing. The elastic spring 6 is used to compensate for the pressure loss when friction plates A4 and B5 wear and become thinner during daily operation. The inner hole of the pressure plate 7 passes into the double-sided bearing 3 and cooperates with the double-sided bearing 3 to restrict the radial movement of the double-sided bearing 3. The disc 7 rotates through its threaded engagement with end A 1, generating pressure that acts on the elastic spring 6. The elastic spring 6 transmits the pressure to the double-sided bearing 3 and end B 2, further transmitting it to create pressure and contact friction between the friction plate A4 mounted on end A 1 and the friction plate B5 mounted on end B 2. The magnitude of the friction force can be controlled by tightening the disc 7. Before use, the required torque is preset using a torque tester. The torque is adjusted by adjusting the pressure of the disc 7. The torque value displayed on the torque tester when the friction plate A4 at end A 1 and the friction plate B5 at end B 2 are rotating and sliding is the set torque value. Then, tighten the positioning screw 8 to lock the disc, preventing it from loosening or shifting under vibration conditions and ensuring torque stability.
[0011] When tightening bolt 10, if Figure 1-17 As shown, the hexagonal inner hole of end B2 acts as a sleeve to fit the bolt 10 to be tightened. When end A1 is connected to the power source electric wrench 9 and rotates, end A1 drives the friction plate A4 to rotate. The friction plate A4 drives the friction plate B5 to rotate through friction. The friction plate B5 drives end B2 to rotate. End B2 drives the bolt 10 to rotate. When the bolt 10 is tightened in place, a torque resistance will be generated. When this resistance is greater than the torque resistance between friction plate A4 and friction plate B5, friction plate A4 and friction plate B5 will slide and rotate. The torque of this sliding rotation is preset by us. According to the theory that forces are reciprocal and that action and reaction forces are equal, the torque acting on the bolt 10 at this time is the torque value that we preset on the friction-type constant torque control device, thereby achieving the purpose of tightening the bolt 10 with constant torque.
Claims
1. A friction-type constant torque control device, characterized in that: It consists of end A, end B, double-sided bearing, friction plate A, friction plate B, elastic compression spring, pressure plate, and positioning screw; The principle is as follows: When the square hole at end A of the friction-type constant torque control device is inserted into the square drive of the electric wrench and fixed, the electric wrench can drive end A to rotate. Friction plate A is installed inside end A, and end A is fixed by a retaining groove. Another friction plate B is installed at end B, and end B is also fixed by a retaining groove. A double-sided bearing is fitted into end B, and end B can only rotate under the restriction of the double-sided bearing. An elastic spring is fitted onto the double-sided bearing. The elastic spring is used to compensate for the pressure loss when friction plates A and B wear and thin during daily operation. The inner hole of the pressure plate passes through the double-sided bearing and cooperates with the double-sided bearing to restrict the radial movement of the double-sided bearing. The pressure plate rotates through the threaded cooperation with end A to generate pressure, which acts on the elastic spring. The elastic spring then transmits the pressure to the double-sided bearing and end B, further transmitting the pressure to the end A. Pressure is generated between friction plate A at end A and friction plate B at end B, and friction is produced through contact friction. The magnitude of the friction force can be controlled by tightening the pressure plate. Before use, the required torque is preset using a torque tester. The torque is adjusted by adjusting the pressure of the pressure plate. The torque value displayed on the torque tester when friction plate A at end A and friction plate B at end B rotate and slide is the set torque value. Then, tighten the positioning screw to lock the pressure plate, preventing it from loosening or shifting under vibration conditions and ensuring torque stability. When tightening the bolt, the hexagonal inner hole at end B acts as a sleeve to fit the bolt to be tightened. When the electric wrench connected to the power source at end A rotates, end A drives friction plate A to rotate. Friction plate A drives friction plate B to rotate through friction, and friction plate B drives end B to rotate. End B then drives the bolt to rotate. When the bolt is tightened to the correct position, torque resistance is generated. When this resistance is greater than the torque resistance between friction plate A and friction plate B, friction plate A and friction plate B will slide and rotate. The torque of this sliding rotation is preset. According to the theory that forces are reciprocal and that action and reaction forces are equal, the torque acting on the bolt at this time is the torque value preset on the friction-type constant torque control device, thereby achieving the purpose of tightening the bolt with constant torque.
2. The friction-type constant torque control device according to claim 1, characterized in that, The friction plates A and B are made of ceramic fiber, carbon fiber, ductile iron, phosphor bronze, beryllium copper, diamond, or asbestos.
3. The friction-type constant torque control device according to claim 1, characterized in that, The elastic compression spring, or spring, or disc spring, or spring sheet is used as thrust compensation when the friction plate wears out and becomes thinner.
4. The friction-type constant torque control device according to claim 1, characterized in that, The aforementioned bidirectional bearing is a bearing capable of bearing loads in both radial and axial directions.