Harmonic speed reducer and tripping device
By designing a device with a jump function in the harmonic reducer, using the cooperation of the friction ring and elastic parts, the equipment damage and safety hazards caused by the lack of an effective jump device in the prior art are solved, and equipment protection in the case of overload torque is achieved.
Patent Information
- Application Number
- CN202422331143.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-24
- Publication Date
- 2025-06-24
- Estimated Expiration
- 2034-09-24
AI Technical Summary
The existing harmonic reducers lack effective jumping devices when they are subjected to overload torque, resulting in equipment damage and safety hazards.
A harmonic reducer and a jumping device are designed, and the first friction ring is driven by the second friction ring, so that the cam rotates simultaneously, and the friction ring is clamped to achieve torque jumping by the cooperation of the annular press plate and the elastic member.
When subjected to overload torque, the device can separate the mechanical connection between the cam and the driving shaft, thereby protecting the harmonic reducer and avoiding damage and safety hazards.
Smart Images
Figure CN223019324U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a speed reducer, in particular to a harmonic speed reducer and a tripping device. Background Art
[0002] In the existing harmonic speed reducer, the torque it receives cannot be predicted under specific circumstances, resulting in damage to the existing harmonic speed reducer due to excessive torque, or even other safety concerns. That is to say, the existing harmonic speed reducer lacks a safety device for tripping based on torque.
[0003] Therefore, the inventor of the present utility model believes that the above defects can be improved. Through painstaking research and the application of scientific principles, a design that is reasonable and effectively improves the above defects is finally proposed. Summary of the Utility Model
[0004] The technical problem to be solved by the present utility model is to provide a harmonic speed reducer and a tripping device in view of the deficiencies of the prior art.
[0005] An embodiment of the present utility model discloses a harmonic speed reducer, including: a tripping device, comprising: a driving shaft, including: a rod body; a retaining wall and a limiting groove, respectively located on both sides of the rod body in an axial direction; a cam, sleeved on the rod body, one side surface of the cam abuts against the retaining wall, and the cam and the retaining wall jointly form a setting space, and the inner edge of the cam in the setting space has two limiting protrusions; a limiting member, mechanically connected to the limiting groove, and part of the limiting member protrudes from the limiting groove to abut against the cam; two first friction rings, mechanically connected to the rod body and located in the setting space, each first friction ring abuts against the two limiting protrusions of the cam, and the two first friction rings drive the cam to rotate; a second friction ring, mechanically connected to the rod body and located between the two first friction rings, the second friction ring rotates synchronously with the rod body; an annular pressing plate, arranged in the setting space; and an elastic member, arranged in the setting space, two ends of the elastic member respectively abut against the annular pressing plate and an inner wall of the cam, and the annular pressing plate can push against the two first friction rings and the second friction ring along an axial direction through the elastic force of the elastic member, so that the annular pressing plate and the retaining wall clamp the two first friction rings and the second friction ring; and a speed reduction device, mechanically connected to the cam; the
[0006] The rod body can drive the two first friction rings through the second friction ring to drive the speed reduction device.
[0007] Preferably, two chip-containing gaps are formed between both sides of the second friction ring and the rod body.
[0008] Preferably, a chip-containing gap is formed between the two first friction rings and the second friction ring.
[0009] Preferably, a first contact section of the two first friction rings contacts a second contact section of the second friction ring; a part of the annular pressing plate abuts against one of the first contact sections, and the projection path of the part of the annular pressing plate in the axial direction can pass through a central area on the cross-section in the radial direction of each of the first contact sections and the second contact section.
[0010] Preferably, a convex portion of the annular pressing plate abuts against one of the first contact sections, and the width of the cross-section of the convex portion in the radial direction is greater than 30% of the width of the cross-section of each of the first contact sections or the second contact section in the radial direction.
[0011] Preferably, the cam includes an elliptical outer cover and two limiting convex blocks connecting the elliptical outer cover, and each of the limiting convex blocks extends from the elliptical outer cover to the retaining wall.
[0012] An embodiment of the present invention also discloses a tripping device, including: a driving shaft, including: a rod body; and a retaining wall and a limiting groove, respectively located on both sides of the rod body in an axial direction; a cam, sleeved on the rod body, one side surface of the cam in the axial direction abuts against the retaining wall, and the cam and the retaining wall together form an installation space, and the inner edge of the cam in the installation space has a limiting convex block; a limiting member, mechanically connected to the limiting groove, and a part of the limiting member protrudes from the limiting groove to abut against the cam; two first friction rings, mechanically connected to the rod body and located in the installation space, each of the first friction rings abuts against the limiting convex block of the cam, and the two first friction rings drive the cam to rotate; a second friction ring, mechanically connected to the rod body and located between the two first friction rings, and the second friction ring rotates synchronously with the rod body; an annular pressing plate, arranged in the installation space; and an elastic member, arranged in the installation space, and two ends of the elastic member respectively abut against the annular pressing plate and an inner wall of the cam away from the retaining wall, and the annular pressing plate can push against the two first friction rings and the second friction ring along an axial direction through the elastic force of the elastic member, so that the annular pressing plate and the retaining wall clamp the two first friction rings and the second friction ring.
[0013] Preferably, two chip-containing gaps are respectively formed between both sides of the second friction ring and the rod body.
[0014] Preferably, a chip-containing gap is formed between the two first friction rings and the second friction ring.
[0015] Preferably, a first contact section of one of the two first friction rings contacts a second contact section of the second friction ring; a part of the annular pressing plate abuts against one of the first contact sections, and a projection path of the part of the annular pressing plate along the axial direction can pass through a central area on a cross-section along the radial direction of each of the first contact sections and the second contact section.
[0016] In summary, the harmonic reducer and the tripping device disclosed in the embodiments of the present invention can, through the design of "the second friction ring drives the two first friction rings to synchronously rotate the cam" and "the annular pressing plate can push against the two first friction rings and the second friction ring along the axial direction through the elastic force of the elastic member, so that the annular pressing plate and the retaining wall clamp the two first friction rings and the second friction ring", when the harmonic reducer and the tripping device bear an overload torque, the mechanical connection relationship between the cam and the driving shaft can be separated to protect the harmonic reducer.
[0017] For a better understanding of the features and technical content of the present invention, please refer to the following detailed description and drawings of the present invention. However, these descriptions and drawings are only used to illustrate the present invention and do not impose any limitation on the protection scope of the present invention.
[0018] BRIEF DESCRIPTION OF THE DRAWINGS BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 is a three-dimensional schematic diagram of the harmonic reducer of the present invention.
[0020] Figure 2 is an exploded schematic diagram of the harmonic reducer of the present invention.
[0021] Figure 3 is an exploded schematic diagram of the tripping device of the present invention.
[0022] Figure 4 is another exploded schematic diagram of the tripping device of the present invention.
[0023] Figure 5 is Figure 1 a schematic cross-sectional view along the V-V cutting line.
[0024] Figure 6 is Figure 2 a schematic cross-sectional view along the VI-VI cutting line.
[0025] Figure 7 is Figure 6 an enlarged schematic diagram of a local area of
[0026] Figure 8 is Figure 6 another enlarged schematic diagram of a local area of
[0027] Figure 9 This is a three-dimensional schematic diagram of another aspect of the harmonic reducer of the present utility model.
[0028] Figure 10 This is a cross-sectional schematic diagram of another aspect of the harmonic reducer of the present utility model. Detailed implementation manners
[0029] The following are specific embodiments to illustrate the disclosed implementation manners of the present utility model. Those skilled in the art can understand the advantages and effects of the present utility model from the content disclosed in this specification. The present utility model can be implemented or applied through other different specific embodiments, and various details in this specification can also be modified and changed based on different viewpoints and applications without departing from the concept of the present utility model.
[0030] In addition, the drawings of the present utility model are only for simple schematic illustration and are not drawn according to actual dimensions, hereby declared. The following implementation manners will further detail the related technical content of the present utility model, but the disclosed content is not used to limit the protection scope of the present utility model.
[0031] It should be understood that although terms such as "first", "second", "third", etc. may be used herein to describe various components or signals, these components or signals should not be limited by these terms. These terms are mainly used to distinguish one component from another component, or one signal from another signal. In addition, the term "or" used herein should, depending on the actual situation, possibly include any one or a combination of more of the associated listed items. Furthermore, the term "electrically coupled" used herein refers to one of "indirect electrical connection" and "direct electrical connection".
[0032] Refer to Figures 1 to 10 As shown, this embodiment provides a harmonic reducer 100. As Figure 1 and Figure 2 shown, the harmonic reducer 100 includes a tripping device 1 and a reduction device 2 mechanically connected to the tripping device 1. Among them, the tripping device 1 can be used to assemble to an external device (not shown, such as a motor), and the tripping device 1 can be disengaged from mechanical connection with the reduction device 2 when bearing an overload torque to protect the harmonic reducer 100.
[0033] It should be noted first that although the disengaging device 1 and the reduction device 2 are jointly defined as the harmonic reducer 100 in this embodiment, the present invention is not limited thereto. For example, the disengaging device 1 can also be used independently (such as: implemented, manufactured, sold, etc.) or used in combination with other components. The following will introduce the component structures of the harmonic reducer 100 respectively and illustrate the connection relationships between the components of the harmonic reducer 100 as appropriate.
[0034] Cooperate with Figures 2 to 4 As shown, the disengaging device 1 can be used as a safety mechanism between the external device and the reduction device 2, and the disengaging device 1 includes a driving shaft 11, a cam 12 sleeved on the driving shaft 11, a limiting member 13 mechanically connected to the driving shaft 11, two first friction rings 14 mechanically connected to the driving shaft 11, a second friction ring 15 located between the two first friction rings 14, an annular pressing plate 16 located on one side of the two first friction rings 14, and an elastic member 17 abutting against the annular pressing plate 16 and the cam 12.
[0035] Specifically, the driving shaft 11 can be used to connect to the external device, and the driving shaft 11 includes a rod body 111, a retaining wall 112 connecting the rod body 111, and a limiting groove 113 located on the rod body 111.
[0036] Among them, as Figure 3 and Figure 4 shown, the rod body 111 has a radial direction D1 and an axial direction D2, and the cross-section of the rod body 111 along the radial direction D1 has two abutting surfaces M111.
[0037] Among them, the positions of the two abutting surfaces M111 are opposite to each other (for example: one of the abutting surfaces M111 is located at the 90-degree position of the rod body 111, and the other abutting surface M111 is located at the 270-degree position of the rod body 111), but the present invention is not limited thereto. In practice, the positions of the two abutting surfaces M111 on the rod body 111 can also be adjusted according to the designer's requirements.
[0038] In addition, the retaining wall 112 is connected to the outer edge of one side of the rod body 111, and the limiting groove 113 is provided on the outer edge of the rod body 111 on the side away from the retaining wall 112. It should be additionally noted that the rod body 111, the retaining wall 112, and the limiting groove 113 are described in an integrally connected manner in this embodiment, but the present utility model is not limited thereto. For example, in other embodiments not shown in the present utility model, the rod body 111, the retaining wall 112, and the limiting groove 113 can be multiple separate components and assembled in any way.
[0039] Refer back Figures 4 to 6 As shown, the cam 12 is axially inserted through the rod body 111 along the axial direction D2, and one side surface of the cam 12 in the axial direction D2 abuts against the retaining wall 112. The cam 12, the retaining wall 112, and the rod body 111 together form a setting space SP. In addition, the inner edge of the cam 12 within the setting space SP has two limiting protrusions 121.
[0040] More specifically, in this embodiment, the cam 12 includes an elliptical outer cover 122 and two limiting protrusions 121 connecting the elliptical outer cover 122. The elliptical outer cover 122 has a through hole, and the elliptical outer cover 122 is inserted through the rod body 111 through the through hole, so that the elliptical outer cover 122 can cover the retaining wall 112 to form the setting space SP. The two limiting protrusions 121 are connected to the inner edge of the elliptical outer cover 122 within the setting space SP, and the positions of the two limiting protrusions 121 are opposite to each other (for example: one of the limiting protrusions 121 is located at the 0-degree position of the elliptical outer cover 122, and the other limiting protrusion 121 is located at the 180-degree position of the elliptical outer cover 122), but the present utility model is not limited thereto. In practice, the positions of the two limiting protrusions 121 within the elliptical outer cover 122 can also be adjusted according to the designer's requirements.
[0041] Refer back Figure 3 、 Figure 4 and Figure 6 As shown, the limiting member 13 is mechanically connected to the limiting groove 113, and part of the limiting member 13 protrudes from the limiting groove 113 to abut against the other side surface of the cam 12 in the axial direction D2. In practice, the limiting member 13 can be, for example, a C-shaped buckle, but the present utility model is not limited thereto.
[0042] As Figure 4 、 Figure 7 and Figure 8As shown, the two first friction rings 14 are mechanically connected to the rod body 111 and located within the setting space SP. Each of the first friction rings 14 abuts against the two limiting bumps 121 of the cam 12, and the two first friction rings 14 drive the cam 12
[0043] to rotate. That is to say, the geometric shape of each of the first friction rings 14 can correspond to the inner edge of the cam 12 and the two limiting bumps 121.
[0044] More specifically, in this embodiment, each of the first friction rings 14 has two first arc portions 141 arranged at intervals, and two first abutting portions 142 connecting the two first arc portions 141. Among them, the inner contour of each of the first abutting portions 142 is arc-shaped, and the outer contour of each of the first abutting portions 142 is linear. When each of the first friction rings 14 is sleeved on the rod body 111 and located within the setting space SP, the positions of the two first abutting portions 142 correspond to the inner sides of the two limiting bumps 121, and the outer edges of the two first abutting portions 142 abut against the two limiting bumps 121, so that the two first friction rings 14 drive the cam 12.
[0045] In practice, in order to ensure that each of the first friction rings 14 can be reliably abutted by the two limiting bumps 121, each of the limiting bumps 121 contacts or is adjacent to the stop wall 113, but the present invention is not limited thereto.
[0046] Refer back to Figure 4 、 Figure 7 、and Figure 8 As shown, the second friction ring 15 is mechanically connected to the rod body 111 and located between the two first friction rings 14, and the second friction ring 15 abuts against the two abutting surfaces M111 of the rod body 111, and the second friction ring 15 can rotate synchronously with the rod body 111.
[0047] Specifically, in this embodiment, the second friction ring 15 has two second arc portions 151 arranged at intervals, and two second abutting portions 152 connecting the two second arc portions 151. Among them, the outer contour of the second abutting portion 152 is arc-shaped, and the inner contour of each of the second abutting portions 152 is linear. When the second friction ring 15 is arranged within the setting space SP, the positions of the two second abutting portions 152 correspond to the two abutting surfaces M111, and the inner edges of the two second abutting portions 152 abut against the two abutting surfaces M111, so that the second friction ring 15 can be driven by the rod body 111 to rotate relative to the cam 12.
[0048] Cooperate with Figure 4 、Figure 7 and Figure 8 As shown in Figure 8 , the annular pressing plate 16 is sleeved on the rod body 111 and located within the setting space SP, and the annular pressing plate 16 is located on the side of the rod body 111 away from the retaining wall 112. More specifically, in this embodiment, the annular pressing plate 16 includes a seat portion 161 and a protruding portion 162 connecting the seat portion 161. Both the seat portion 161 and the protruding portion 162 are annular. The protruding portion 162 bulges from a side edge of the seat portion 161 facing the retaining wall 112, and the protruding portion 162 can abut against the first friction ring 14 away from the retaining wall 112, so that the seat portion 161 does not contact any of the first friction rings 14, but the present invention is not limited thereto. For
[0049] example, in other embodiments not shown in the present invention, the annular pressing plate 16 may only have the seat portion 161, and the seat portion 161 abuts against the first friction ring 14.
[0050] Refer again to Figure 4 , Figure 7 and Figure 8 As shown in Figure 8 , the elastic member 17 is disposed on the rod body 111 and located within the setting space SP, and both ends of the elastic member 17 respectively abut against the seat portion 161 of the annular pressing plate 16 and an inner wall of the cam 12 away from the retaining wall 112. The annular pressing plate 16 can push against the two first friction rings 14 and the second friction ring 15 along the axial direction D2 by the elastic force of the elastic member 17, so that the annular pressing plate 16 and the retaining wall 112 clamp the two first friction rings 14 and the second friction ring 15.
[0051] Accordingly, when the second friction ring 15 rotates through the rod body 111, the second friction ring 15 can mechanically connect the two first friction rings 14 by friction, so that the rotating second friction ring 15 drives the two first friction rings 14 to drive the cam 12 to rotate. On the contrary, when the torque received by the driving shaft 11 exceeds the static friction force between the second friction ring 15 and the two first friction rings 14, the rotating second friction ring 15 slips relative to the two first friction rings 14, so that the driving shaft 11 cannot drive the cam 12 to rotate.
[0052] In practice, the designer can set the torque threshold of the tripping device 1 by adjusting the static friction force between the second friction ring 15 and the two first friction rings 14, and the elastic force of the elastic member 17 along the axial direction D2.
[0053] Preferably, there is a friction area FA between the two first friction rings 14 and the second friction ring 15. The part of each first friction ring 14 in the friction area FA is defined as a first contact section, and the part of the second friction ring 15 in the friction area FA is defined as a second contact section. That is to say, the first contact sections of the two first friction rings 14 contact the second contact sections of the second friction ring 15. The convex part 162 abuts against one of the first contact sections, and the projection path of the convex part 162 along the axial direction D2 can pass through a central area on the cross-section along the radial direction D1 of each first contact section and the second contact section, so that the convex part 162 pushed by the elastic member 17 can ensure reliable mechanical connection between the second friction ring 15 and the two first friction rings 14.
[0054] Wherein, the central area can be understood as "an area passing through the center point of the first contact section (or the second contact section), and the width of the area along the radial direction D1 is greater than 10% of the width of the first contact section (or the second contact section) along the radial direction D1".
[0055] In addition, the cross-sectional width of the convex part 162 along the radial direction D1 is preferably greater than 30% of the cross-sectional width of each first contact section or the second contact section along the radial direction D1, so as to strengthen the mechanical connection predictably.
[0056] It should be noted that in order to prevent debris generated by the two first friction rings 14 and the first friction ring 14 from affecting the operation of the tripping device 1, there can be a first chip-containing gap GP1 between the two first friction rings 14 and the second friction ring 15, and two second chip-containing gaps GP2 can be respectively provided on both sides of the second friction ring 15.
[0057] Specifically, the inner edge of the second friction ring 15 abuts against the outer edge of the rod body 111, so that the first chip-containing gap GP1 is generated between the two first friction rings 14 and the second friction ring 15.
[0058] In addition, the outer edges of the two first friction rings 14 abut against the inner edge of the cam 12, so that two second chip-containing gaps GP2 are generated between both sides of the second friction ring 15 and the rod body 111.
[0059] In other words, the cross-sections of the two first friction rings 14 along the radial direction D1 and the cross-sections of the first friction rings 14 along the radial direction D1 are arranged in an interleaved manner, and the two first friction rings 14 do not contact the driving shaft 11, and the second friction ring 15 does not contact the cam 12.
[0060] In other words, the cross-sections of the two first friction rings 14 along the radial direction D1 and the cross-sections of the first friction rings 14 along the radial direction D1 are arranged in an interleaved manner, and the two first friction rings 14 do not contact the driving shaft 11, and the second friction ring 15 does not contact the cam 12.
[0061] In practice, the first chip pocket GP1 and the two second chip pockets GP2 can not only accommodate chips but also serve as heat dissipation channels. In addition, the tripping device 1 may alternatively have at least one of the first chip pocket GP1 and the two second chip pockets GP2. For example, in other embodiments not shown, the second friction ring 15 can contact the cam 12 and the driving shaft 11, so that the tripping device 1 only has the two second chip pockets GP2.
[0062] Refer again to Figure 5 As shown, the reduction device 2 is sleeved on the cam 12. The reduction device 2 can be driven by the cam 12, that is, the driving shaft 111 can drive the two first friction rings 14 through the second friction ring 15 to drive the reduction device 2.
[0063] In practice, the reduction device 2 includes a flexible bearing 21, a flexspline 22, a rigid ring 23 and a roller bearing 24. The flexible bearing 21 is mechanically connected to the cam 12 of the tripping device 1. The flexspline 22 is disposed on the flexible bearing 21, and the inner edge of the flexspline 22 is mechanically connected to the flexible bearing 21. The outer edge of the flexspline 22 can be mechanically connected to the rigid ring 23 and the roller bearing 24. Among them, the flexspline 22 can be designed as a cup-shaped structure (as Figure 1 and Figure 5 shown), or a cap-shaped structure (as Figure 9 and Figure 10 shown). In addition, the operation of the reduction device 2 is a technology well known to those skilled in the art and is not the technical focus of the present utility model, so it will not be introduced separately here.
[0064] [Technical effects of the embodiments of the present utility model]
[0065] In summary, the harmonic reducer and the tripping device disclosed in the embodiments of the present utility model can, through the design of "the second friction ring drives the two first friction rings to synchronously rotate the cam" and "the annular pressing plate can push against the two first friction rings and the second friction ring along the axial direction through the elastic force of the elastic member, so that the annular pressing plate and the stop wall clamp the two first friction rings and the second friction ring", when the harmonic reducer and the tripping device bear an overload torque, the mechanical connection relationship between the cam and the driving shaft can be separated to protect the harmonic reducer.
[0066]
[0067] The above are only the preferred feasible embodiments of the present utility model, and are not used to limit the protection scope of the present utility model. All equivalent changes and modifications made according to the scope of the patent application of the present utility model shall fall within the protection scope of the claims of the present utility model.
Claims
1. A harmonic reducer, characterized in that: The harmonic reducer comprises: A trip device, comprising: A driving shaft, comprising: a rod body; and A stop wall and a limit groove are respectively located on two sides of the rod body in an axial direction; A cam is disposed on the rod body, and one side surface of the cam is against the stop wall. The cam and the stop wall together form a setting space, and the cam has two limiting protrusions on the inner edge of the setting space; a limiting member mechanically connected to the limiting slot, wherein a portion of the limiting member protrudes from the limiting slot to abut against the cam; Two first friction rings are mechanically connected to the rod body and are located in the setting space, each of the first friction rings abuts against the two limiting protrusions of the cam, and the two first friction rings drive the cam to rotate; a second friction ring, mechanically connected to the rod body and located between the two first friction rings, the second friction ring rotating synchronously with the rod body; an annular pressure plate, disposed in the disposition space; and an elastic member, disposed in the setting space, with two ends of the elastic member respectively abutting against the annular pressure plate and an inner wall of the cam, and the annular pressure plate can push the two first friction rings and the second friction rings along an axial direction through the elastic force of the elastic member, so that the annular pressure plate and the stop wall clamp the two first friction rings and the second friction rings; and A reduction device is mechanically connected to the cam; the rod body can drive the two first friction rings through the second friction ring to drive the reduction device.
2. The harmonic reducer according to claim 1, characterized in that: Two chip gaps are formed between the two sides of the second friction ring and the rod body.
3. The harmonic reducer according to claim 1, characterized in that: A chip clearance is formed between the two first friction rings and the second friction ring.
4. The harmonic reducer according to claim 1, characterized in that: A first contact segment of the two first friction rings contacts a second contact segment of the second friction ring; a portion of the annular pressure plate abuts against one of the first contact segments, and a projection path of the portion of the annular pressure plate along the axial direction can pass through a central area on a cross-sectional surface of each of the first contact segments and the second contact segment along a radial direction.
5. The harmonic reducer according to claim 4, characterized in that: A protrusion of the annular pressure plate abuts against one of the first contact segments, and a cross-sectional width of the protrusion along the radial direction is greater than 30% of a cross-sectional width of each of the first contact segment or the second contact segment along the radial direction.
6. The harmonic reducer according to claim 1, characterized in that: The cam includes an elliptical outer cover and two limiting protrusions connected to the elliptical outer cover, and each limiting protrusion extends from the elliptical outer cover to the stopping wall.
7. A tripping device, characterized in that: The tripping device comprises: A driving shaft, comprising: a rod body; and A stop wall and a limit groove are respectively located on two sides of the rod body in an axial direction; A cam is disposed on the rod body, one side of the cam in the axial direction abuts against the stop wall, and the cam and the stop wall jointly form a setting space, and the cam has a limiting protrusion on the inner edge in the setting space; a limiting member mechanically connected to the limiting slot, wherein a portion of the limiting member protrudes from the limiting slot to abut against the cam; Two first friction rings are mechanically connected to the rod body and are located in the setting space, each of the first friction rings abuts against the limiting protrusion of the cam, and the two first friction rings drive the cam to rotate; a second friction ring, mechanically connected to the rod body and located between the two first friction rings, the second friction ring rotating synchronously with the rod body; an annular pressure plate, disposed in the arrangement space; and An elastic member is arranged in the setting space, and two ends of the elastic member respectively abut against the annular pressure plate and an inner wall of the cam away from the stop wall. The annular pressure plate can push the two first friction rings and the second friction rings along an axial direction through the elastic force of the elastic member, so that the annular pressure plate and the stop wall clamp the two first friction rings and the second friction rings.
8. The tripping device according to claim 7, characterized in that: Two chip gaps are respectively formed between the two sides of the second friction ring and the rod body.
9. The tripping device according to claim 7, characterized in that: A chip clearance is formed between the two first friction rings and the second friction ring.
10. The tripping device according to claim 7, characterized in that: A first contact segment of the two first friction rings contacts a second contact segment of the second friction ring; a portion of the annular pressure plate abuts against one of the first contact segments, and a projection path of the portion of the annular pressure plate along the axial direction can pass through a central area on a cross-sectional surface of each of the first contact segments and the second contact segment along a radial direction.