Friction plate type overrunning clutch with torque protection function

Abstract

The invention provides a friction plate type overrunning clutch with a torque protection function. The friction plate type overrunning clutch with the torque protection function comprises an inner ring, an outer ring, a pressing plate and a shaft check ring, the pressing plate is arranged between the outer ring and the inner ring, at least one friction plate and a dual plate are arranged between the outer ring and the pressing plate, at least one safety pin is arranged between the pressing plate and the inner ring, and the safety pin is arranged between the outer ring and the pressing plate. A torsional spring is arranged between the pressing plate and the inner ring, the outer cylindrical face of the pressing plate is sleeved with a protective sleeve, and the shaft check ring is arranged at the end of the inner ring. The friction plate type overrunning clutch with the torque protection function has the advantages of being compact in structure, low in cost, low in noise, long in service life and suitable for small space scenes.

Description

Technical Field

[0001] This invention belongs to the field of mechanical transmission components technology, and in particular relates to a friction plate overrunning clutch with torque protection function suitable for small space and low torque scenarios (such as medical devices and small automated equipment transmission systems). Background Technology

[0002] An overrunning clutch is a fundamental component in mechanical transmission systems. It can automatically engage or disengage based on changes in the speed or rotation direction of the driving and driven components. It is widely used in many fields such as packaging machinery, food machinery, light industrial machinery, agricultural machinery, metallurgy and mining, petrochemicals, machine tools, automobiles, weaponry, aviation, and power plants.

[0003] Existing overrunning clutches are mainly classified into three types: ratchet, roller, and wedge. Among them, the ratchet-type overrunning clutch has a simple structure, is easy to manufacture, and has high reliability. However, the ratchet-type overrunning clutch has a freewheeling angle, and exhibits significant impact and noise during engagement, which can easily lead to equipment wear in precision transmission scenarios. The roller and wedge-type clutches have complex structures, require high precision machining of parts, have high manufacturing costs, and are difficult to assemble, making them unsuitable for installation in confined spaces. Furthermore, existing overrunning clutches generally lack torque protection functions, which can easily damage the transmission system under overload conditions.

[0004] To address the aforementioned shortcomings, this invention provides a low-torque friction plate overrunning clutch that is simple in structure, low in cost, engages smoothly, and has torque protection function, making it particularly suitable for precision transmission scenarios with low torque and limited space. Summary of the Invention

[0005] The technical problem solved by this invention is to provide a friction plate overrunning clutch with torque protection function that has the advantages of compact structure, low cost, low noise, and long service life, and is suitable for small space scenarios.

[0006] To solve the above-mentioned technical problems, the present invention provides a friction plate type overrunning clutch with torque protection function, comprising: an inner ring, an outer ring, a pressure plate, and a shaft retaining ring. The pressure plate is disposed between the outer ring and the inner ring. At least one friction plate and a mating plate are disposed between the outer ring and the pressure plate. At least one safety pin is disposed between the pressure plate and the inner ring. A torsion spring is disposed between the pressure plate and the inner ring. A protective sleeve is fitted on the outer cylindrical surface of the pressure plate. The shaft retaining ring is disposed at the end of the inner ring.

[0007] As a further embodiment of the present invention, the outer circle of the friction plate is an external spline, and the inner hole of the outer ring is provided with an internal spline, wherein the external spline of the friction plate and the internal spline of the outer ring are engaged.

[0008] As a further embodiment of the present invention, the inner circle of the mating piece is an internal spline, and the outer circle of the inner ring is provided with an external spline, wherein the internal spline of the mating piece and the external spline of the inner ring are engaged.

[0009] As a further embodiment of the present invention, the number of friction plates and mating plates are equal and they are arranged alternately, and the left end face of the mating plate is in close contact with the right end face of the pressure plate.

[0010] As a further embodiment of the present invention, the safety pin is a hollow structure with a groove, the inner ring is provided with a pin hole that cooperates with the safety pin, and the pressure plate is provided with a spiral groove that cooperates with the safety pin.

[0011] As a further embodiment of the present invention, one end of the torsion spring is connected to the inner ring, and the other end is connected to the pressure plate, and the torsion spring is initially in a compressed state.

[0012] As a further embodiment of the present invention, the protective sleeve has at least one magnet evenly distributed circumferentially, and the number and distribution of the magnets are the same as those of the safety pin.

[0013] As a further aspect of the present invention, a bearing is installed between the inner ring and the outer ring, and the bearing is used to support the overall structure.

[0014] As a further embodiment of the present invention, the inner hole of the pressure plate is a cylindrical surface, the outer circle of the inner ring is a cylindrical surface, and the inner hole surface of the pressure plate and the outer circle surface of the inner ring are in clearance fit.

[0015] As a further embodiment of the present invention, at least one spiral groove is evenly distributed circumferentially on the pressure plate, and the spiral groove is used to cooperate with the safety pin to realize the left and right spiral movement of the pressure plate.

[0016] Compared with related technologies, the friction plate overrunning clutch with torque protection function provided by the present invention has the following beneficial effects: In the driving state, the pressure plate presses the friction plate and the mating plate together to form a self-locking torque transmission; when the torque exceeds the load capacity, the safety pin shears off, the pressure plate can no longer press the friction plate and the mating plate together, the self-locking is released, and the torque protection is completed; in the overrun state, the pressure plate disengages from the mating plate, the self-locking is released, and the separation is completed. Attached Figure Description

[0017] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0018] Figure 1 This is an exploded view of Embodiment 1 of the present invention; Figure 2 This is a structural diagram of the inner ring of Embodiment 1 of the present invention; Figure 3 This is a diagram of the outer ring structure of Embodiment 1 of the present invention; Figure 4 This is a structural diagram of a torsion spring according to Embodiment 1 of the present invention; Figure 5 This is a structural diagram of the pressure plate according to Embodiment 1 of the present invention; Figure 6 This is a structural diagram of the protective sleeve according to Embodiment 1 of the present invention; Figure 7 This is a schematic diagram showing the engagement of the pressure plate and the safety pin during operation in Embodiment 1 of the present invention; Figure 8 This is a schematic diagram of the overrun pressure plate and safety pin in Embodiment 1 of the present invention; Figure 9 This is a schematic diagram of the safety pin during torque protection in Embodiment 1 of the present invention; Figure 10 This is an exploded view of Embodiment 2 of the present invention; Figure 11 This is a structural diagram of the inner ring of Embodiment 2 of the present invention; Figure 12 This is a diagram of the outer ring structure of Embodiment 2 of the present invention; Figure 13 This is a structural diagram of the torsion spring according to Embodiment 2 of the present invention; Figure 14 This is a structural diagram of the pressure plate according to Embodiment 2 of the present invention; Figure 15 This is a schematic diagram showing the engagement of the pressure plate and safety pin during operation in Embodiment 2 of the present invention; Figure 16 This is a schematic diagram of the overrun pressure plate and safety pin in Embodiment 2 of the present invention; Figure 17 This is a schematic diagram of the safety pin during torque protection in Embodiment 2 of the present invention.

[0019] In the diagram: 1. Shaft retaining ring; 2. Bearing; 3. Torsion spring; 4. Pressure plate; 5. Inner ring; 6. Coupled plate; 7. Friction plate; 8. Outer ring; 9. Safety pin; 10. Protective sleeve; 11. Magnet; 12. Shaft retaining ring; 13. Second magnet; 31. One end support leg of the torsion spring; 32. The other end support leg of the torsion spring; 41. Hole on the pressure plate; 42. Helical groove; 421. Left helical surface; 422. Right helical surface; 43. Inner hole of the pressure plate; 44. Cylindrical surface of the pressure plate; 51. Outer spline of the outer circle of the inner ring; 52. Cylindrical surface of the inner ring; 53. Hole on the inner ring; 81. Inner spline of the inner hole of the outer ring; 82. Friction surface of the outer ring; 83. Hole on the outer ring; 84. Inner spline of the inner hole of the outer ring; 91. Upper half of the safety pin; 92. Lower half of the safety pin; 102. Inner hole of the protective sleeve. Detailed Implementation

[0020] Example 1: Please refer to the following: Figures 1 to 9A friction plate overrunning clutch with torque protection function includes: an inner ring 5, an outer ring 8, a pressure plate 4, and a shaft retaining ring 1. The pressure plate 4 is disposed between the outer ring 8 and the inner ring 5. At least one friction plate 7 and a mating plate 6 are disposed between the outer ring 8 and the pressure plate 4. At least one safety pin 9 is disposed between the pressure plate 4 and the inner ring 5. A torsion spring 3 is disposed between the pressure plate 4 and the inner ring 5. A protective sleeve 10 is fitted on the outer cylindrical surface of the pressure plate 4. The shaft retaining ring 1 is disposed at the end of the inner ring 5.

[0021] The outer circle of the friction plate 7 is an external spline, and the inner hole of the outer ring 8 is provided with an internal spline. The external spline of the friction plate 7 and the internal spline of the outer ring 8 are matched.

[0022] The inner circle of the mating piece 6 is an internal spline, and the outer circle of the inner ring 5 is provided with an external spline. The internal spline of the mating piece 6 and the external spline of the inner ring 5 are matched.

[0023] The number of friction plates 7 and the number of mating plates 6 are equal and they are arranged alternately. The left end face of the mating plate 6 is in close contact with the right end face of the pressure plate 4.

[0024] The safety pin 9 is a hollow structure with a groove. The inner ring 5 is provided with a pin hole that cooperates with the safety pin 9. The pressure plate 4 is provided with a spiral groove 42 that cooperates with the safety pin 9.

[0025] One end of the torsion spring 3 is connected to the inner ring 5, and the other end is connected to the pressure plate 4. The torsion spring 3 is initially in a compressed state.

[0026] The protective sleeve 10 has at least one magnet 11 evenly distributed circumferentially, and the number and distribution of the magnets 11 are the same as those of the safety pin 9.

[0027] A bearing 2 is installed between the inner ring 5 and the outer ring 8, and the bearing 2 is used to support the overall structure.

[0028] The inner hole of the pressure plate 4 is a cylindrical surface, the outer circle of the inner ring 5 is a cylindrical surface, and the inner hole surface of the pressure plate 4 and the outer circle surface of the inner ring 5 are in clearance fit.

[0029] At least one spiral groove 42 is evenly distributed circumferentially on the pressure plate 4. The spiral groove 42 is used to cooperate with the safety pin 9 to realize the left and right spiral movement of the pressure plate 4.

[0030] The working principle of the friction plate overrunning clutch with torque protection function provided by this invention is as follows: When the overrunning clutch is in drive mode, the safety pin 9 is pressed against the right spiral surface 422 of the spiral groove 42 of the pressure plate 4. The pressure plate 4 moves to the right spiral to squeeze the friction plate 6. The pressure plate 4, friction plate 6, mating plate 7, and inner ring 5 form a friction self-locking mechanism to transmit torque.

[0031] When the overrunning clutch is in overrunning mode, the outer ring 8 rotates faster than the inner ring 5. The safety pin 9 is pressed against the left spiral surface 421 of the spiral groove 42 of the pressure plate 4. The pressure plate 4 has a tendency to move to the left spiral. The pressure plate 4 cannot squeeze the friction plate 6, the self-locking is released, and the torque transmission between the outer ring 8 and the inner ring 5 is disconnected.

[0032] When the overrunning clutch is in drive mode and the transmitted torque exceeds the clutch limit, the safety pin 9 is sheared at the mating surface between the outer ring 8 and the pressure plate 4. Part of the safety pin 9 is fixed on the outer ring 8, and the other part is attracted by the magnet 11. The safety pin 9 is separated, and the pressure plate 4 can no longer press the friction plate 6 and the mating plate 7 together. The self-locking is released, and the torque protection is completed.

[0033] Example 2: Please refer to 10 to [the relevant section]. Figure 17 The structure of this embodiment is similar to that of Embodiment 1, with the main difference being the shape of the components and their connection relationships, including: shaft retaining ring 1, bearing 2, torsion spring 3, pressure plate 4, inner ring 5, friction plate 6, mating plate 7, outer ring 8, safety pin 9, and second magnet 13.

[0034] like Figure 11 As shown, the outer circle of the inner ring 5 has an external spline 51, which mates with the internal spline of the mating piece 7. The inner ring 5 has a friction surface 52 that is in close contact with the mating piece 7.

[0035] like Figure 12 As shown, the outer ring 8 has a hole 81 for fixing the torsion spring 3 and a pin hole 83 for fixing the safety pin 9 on its outer circle. The inner hole 82 of the outer ring 8 fits with the outer circle of the pressure plate 4. The inner hole 82 has an internal spline 84 that fits with the friction plate 6.

[0036] like Figure 13 As shown, one end of the torsion spring 3, leg 32, engages with the hole 83 of the outer ring 8, and the other end, leg 31, engages with the pressure plate 4. When the torsion spring is in a compressed state, it pushes the pressure plate 4 to rotate to the right, so that the right end face of the pressure plate 4 is in constant contact with the left end face of the friction plate 6.

[0037] like Figure 14 As shown, there is a hole 41 on the left end face of the pressure plate 4 for fixing one end support leg 31 of the torsion spring 3. The outer circle 43 of the pressure plate 4 is matched with the cylindrical hole 82 of the outer ring 8. There is a spiral groove 42 on the surface of the pressure plate 4, which is matched with the safety pin 9.

[0038] Working principle: When the overrunning clutch is in driving state, the safety pin 9 is pressed against the right spiral surface 422 of the spiral groove 42 of the pressure plate 4. The pressure plate 4 moves to the right spiral to squeeze the friction plate 6, forming a friction self-lock and transmitting torque. At the same time, the pressure plate transmits the torque to the outer ring 8 through the safety pin 9.

[0039] When the overrunning clutch is in overrunning mode, the outer ring 8 rotates faster than the inner ring 5. The safety pin 9 is pressed against the left spiral surface 421 of the spiral groove 42 of the pressure plate 4. The pressure plate 4 moves to the left spiral. The pressure plate 4 can no longer squeeze the friction plate 6, the self-locking is released, and the torque transmission between the outer ring 8 and the inner ring 5 is disconnected.

[0040] When the overrunning clutch is in drive mode and the transmitted torque exceeds the clutch limit, the safety pin 9 is sheared at the mating surface between the outer ring 8 and the pressure plate 4. Part of the safety pin 9 is fixed on the outer ring 8, and the other part is attracted by the second magnet 13. The safety pin 9 is separated, and the pressure plate 4 can no longer press the friction plate 6 and the mating plate 7 together. The self-locking is released, and the torque protection is completed.

[0041] It should be noted that the device structure and accompanying drawings of this invention mainly describe the principle of this invention. In terms of the technical aspects of this design principle, the setting of the power mechanism, power supply system and control system of the device is not fully described. However, under the premise that those skilled in the art understand the principle of the above invention, the specific details of its power mechanism, power supply system and control system can be clearly understood. The control method in the application document is automatic control through a controller. The control circuit of the controller can be implemented by those skilled in the art through simple programming. All standard parts used can be purchased from the market, and can be customized according to the instructions and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the existing technology. The machinery, parts and equipment adopt conventional models in the existing technology, and the structure and principle of the components known to those skilled in the art can be known by those skilled in the art through technical manuals or conventional experimental methods.

[0042] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments, or they can be used directly or indirectly, without departing from the principles and spirit of the invention. In other related technical fields, the scope of the invention is defined by the appended claims and their equivalents, and they are similarly included within the scope of patent protection of the invention.

Claims

1. A friction plate type overrunning clutch with torque protection function, characterized in that, include: The device comprises an inner ring, an outer ring, a pressure plate, and a shaft retaining ring. The pressure plate is disposed between the outer ring and the inner ring. At least one friction plate and a mating plate are provided between the outer ring and the pressure plate. At least one safety pin is provided between the pressure plate and the inner ring. A torsion spring is provided between the pressure plate and the inner ring. A protective sleeve is fitted on the outer cylindrical surface of the pressure plate. The shaft retaining ring is disposed at the end of the inner ring.

2. The friction plate overrunning clutch with torque protection function according to claim 1, characterized in that: The outer circle of the friction plate has an external spline, and the inner hole of the outer ring has an internal spline. The external spline of the friction plate and the internal spline of the outer ring are matched.

3. The friction plate overrunning clutch with torque protection function according to claim 1, characterized in that: The inner circle of the mating piece has an internal spline, and the outer circle of the inner ring has an external spline. The internal spline of the mating piece and the external spline of the inner ring are matched.

4. The friction plate overrunning clutch with torque protection function according to claim 1, characterized in that: The number of friction plates and mating plates are equal and they are arranged alternately, with the left end face of the mating plate being in close contact with the right end face of the pressure plate.

5. The friction plate overrunning clutch with torque protection function according to claim 1, characterized in that: The safety pin is a hollow structure with a groove, the inner ring has a pin hole that mates with the safety pin, and the pressure plate has a spiral groove that mates with the safety pin.

6. The friction plate overrunning clutch with torque protection function according to claim 1, characterized in that: One end of the torsion spring is connected to the inner ring, and the other end is connected to the pressure plate. The torsion spring is initially in a compressed state.

7. The friction plate overrunning clutch with torque protection function according to claim 1, characterized in that: The protective sleeve has at least one magnet evenly distributed around its circumference, and the number and distribution of the magnets are the same as those of the safety pin.

8. The friction plate overrunning clutch with torque protection function according to claim 1, characterized in that: A bearing is installed between the inner ring and the outer ring, and the bearing is used to support the overall structure.

9. The friction plate overrunning clutch with torque protection function according to claim 1, characterized in that: The inner hole of the pressure plate is a cylindrical surface, the outer circle of the inner ring is a cylindrical surface, and the inner hole surface of the pressure plate and the outer circle surface of the inner ring are in clearance fit.

10. The friction plate overrunning clutch with torque protection function according to claim 1, characterized in that: At least one spiral groove is evenly distributed circumferentially on the pressure plate, and the spiral groove is used to cooperate with the safety pin to realize the left and right spiral movement of the pressure plate.

Images