An engine that starts from energy storage

Abstract

This invention addresses the problem of poor continuity of shaft rotation during the start-up process in existing engines, which leads to starting difficulties. It provides an energy-storage starting engine by setting up an energy-storage disc spring box in conjunction with a one-way bearing and a second coil spring. This allows the tension to be converted into the elastic force of the second coil spring for storage and continuous release, maintaining the rotation of the engine shaft and facilitating engine starting.

Description

Technical Field

[0001] This invention relates to the field of engine technology, and in particular to an engine that uses energy storage for starting. Background Technology

[0002] Traditional engines typically require a starter pull to start, as illustrated in patent application CN116025465A. However, in existing engine starters, starting the engine relies on manually pulling a rope, which drives a pulley and a shaft inside the engine. When the pulley retracts the rope, if the engine is started, the shaft continues to rotate; if not, it stops rotating due to inertia after a short time. To maintain continuous rotation of the shaft and start the engine, the rope-pulling and retracting process must be repeated rapidly, consuming significant manpower and making engine starting difficult. Therefore, an engine capable of storing energy to maintain continuous shaft rotation is needed. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide an engine that starts from energy storage.

[0004] To solve the above problems, the present invention adopts the following technical solution: An energy-storage starting engine includes an engine body and a hand-operated pulley structure, wherein the hand-operated pulley structure is drive-connected to the engine body and is used to drive a shaft within the engine body to rotate; characterized in that the hand-operated pulley structure includes a pulley housing, a pull rope, a pulley wheel, a pawl, a power storage disc spring box, a one-way bearing, and a transmission structure for drive-connection with the engine body; wherein the pulley housing is fixedly connected to the engine body, and a connecting shaft for connecting the pulley wheel and the power storage disc spring box is provided on the pulley housing; the pulley wheel is rotatably mounted on the connecting shaft, and a pull rope is wound around the pulley wheel; one side of the pulley wheel is close to the inner wall of the pulley housing, and the other side of the pulley wheel... A power storage spring box is provided on one side; a first coil spring is provided between the rope pulley and the pull plate housing to help the rope pulley retract the rope; the power storage spring box is rotatably mounted on the connecting shaft via a one-way bearing, the rotation direction of the one-way bearing being the same as the rotation direction of the rope pulley when pulling the rope; a first ratchet is provided on the side of the power storage spring box near the rope pulley; a pawl corresponding to the first ratchet is provided on the side of the rope pulley near the power storage spring box; a transmission structure is provided on the side of the power storage spring box away from the rope pulley; the transmission structure is rotatably mounted on the connecting shaft; a second coil spring for storing elastic force is also provided between the transmission structure and the power storage spring box; the transmission structure is also connected to the engine body.

[0005] Furthermore, the rope pulley is rotatably equipped with two pawls, which are symmetrical about the center of the rope pulley; the pawls cooperate with the first ratchet on the energy storage disc spring box, so that when the rope pulley rotates while pulling the rope, it drives the energy storage disc spring box to rotate.

[0006] Furthermore, the rope wheel is provided with a protruding connecting post, which is used to rotate and connect the pawl; a torsion spring is also provided between the pawl and the rope wheel to help the pawl reset.

[0007] Furthermore, the middle part of the energy storage disc spring box is provided with an embedding hole for embedding a one-way bearing; the embedding hole is generally cylindrical concave, and the bottom of the embedding hole is also provided with a through hole for passing through the connecting shaft.

[0008] Furthermore, the sidewall of the embedding hole is provided with a protruding snap-fit ​​strip, which abuts against the outer surface of the one-way bearing.

[0009] Furthermore, the outer surface of the one-way bearing is provided with a snap-fit ​​groove that matches the snap-fit ​​strip, and the extension direction of the snap-fit ​​groove is parallel to the axis of the one-way bearing; the snap-fit ​​strip is embedded in the snap-fit ​​groove.

[0010] Furthermore, the one-way bearing includes a bearing sleeve, needle rollers, an elastic plate, and a sealing plate; wherein the bearing sleeve is generally annular cylindrical, and a movable groove is provided on the side near the inner wall of the bearing sleeve; a square hole is provided on the side of the movable groove near the inside of the bearing sleeve, the square hole connecting the inside of the bearing sleeve and the movable groove; the distance between the two ends of the movable groove and the inner wall of the bearing sleeve is different, and the square hole is located at the end of the movable groove near the inner wall of the bearing sleeve; the needle rollers are generally cylindrical and are located in the movable groove; an elastic plate is also provided in the movable groove, the two ends of the elastic plate abutting against the inside of the movable groove and the needle rollers respectively, for pushing the needle rollers towards the end of the movable groove with the square hole; the sealing plate is provided at the end of the bearing sleeve.

[0011] Furthermore, a handle is provided at the end of the pull rope away from the rope wheel; the handle includes a rope frame and a grip; the grip is provided with a groove for embedding the rope frame, and the grip is also provided with a first rope hole connecting the outside of the grip and the inside of the groove; the rope frame is provided with a second rope hole for connecting the pull rope.

[0012] Furthermore, the transmission structure includes a second ratchet, which is connected to the engine body in a transmission manner.

[0013] Furthermore, a flat washer for limiting the position is provided at the end of the connecting shaft away from the connecting pull plate housing. The flat washer is fixedly connected to the connecting shaft by screws. The flat washer restricts the transmission structure, the energy storage disc spring box, and the rope pulley to the connecting shaft.

[0014] The beneficial effects of this invention are as follows: By setting up a power storage disc spring box in conjunction with a one-way bearing and a second coil spring, the tension is converted into the elastic force of the second coil spring for storage and continuous release, so as to keep the shaft of the engine body able to rotate and facilitate engine starting. By setting a pawl to engage with the first ratchet, the rope wheel can drive the energy storage disc spring box to rotate in one direction, and reduce the interference to the energy storage disc spring box when the rope wheel retracts to pull the rope. By setting a snap-fit ​​strip in the embedding hole of the energy storage disc spring box, and cooperating with the snap-fit ​​groove on the one-way bearing, the one-way bearing can be kept to rotate stably with the energy storage disc spring box; By setting up a needle roller with elastic plate and movable groove structure in the one-way bearing, unidirectional rotation is achieved when the one-way shaft is sleeved on the connecting shaft. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall engine structure of Example 1; Figure 2 This is an exploded view of the hand-operated tray structure in Example 1; Figure 3 This is a schematic diagram of the rope pulley in Example 1; Figure 4 This is a schematic diagram of the pull plate housing of Example 1; Figure 5 This is a schematic diagram of a one-way bearing in Example 1; Figure 6 This is a schematic diagram of the transmission structure in Example 1; Figure 7 Schematic diagram of the energy storage disc spring box in Example 1 Figure 1 ; Figure 8 Schematic diagram of the energy storage disc spring box in Example 1 Figure 2 ; Figure 9 Exploded view of the handle in Example 1 Figure 10 This is a schematic diagram of a one-way bearing in Example 1; Figure 11 This is an exploded view of the one-way bearing in Example 1.

[0016] Explanation of reference numerals in the attached diagram: Engine body 1, Hand pull plate structure 2, Pull plate housing 21, Connecting shaft 211, Connecting rope bracket 222, Handle 223, Groove 224, Rope pulley 23, Connecting column 232, Pawl 24, Energy storage disc spring box 25, First ratchet 251, Embedded hole 252, Snap-fit ​​strip 253, One-way bearing 26, Snap-fit ​​groove 261, Bearing sleeve 262, Needle roller 263, Square hole 264, Sealing plate 265, Movable groove 266, Transmission structure 27, Second ratchet 271, Flat washer 272, Nameplate 28. Detailed Implementation

[0017] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0018] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the figures only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0019] Example 1: like Figures 1-11As shown, an energy-storage starting engine includes an engine body 1 and a hand-operated pulley structure 2, wherein the hand-operated pulley structure 2 is driven to rotate a shaft inside the engine body 1. In this example, the shaft inside the engine body 1 is a crankshaft. The hand-operated pulley structure 2 includes a pulley housing 21, a pull rope, a pulley 23, a pawl 24, a power storage spring box 25, a one-way bearing 26, and a transmission structure 27 for driving connection with the engine body 1. The pulley housing 21 is fixedly connected to the engine body 1, and a connecting shaft 211 for connecting the pulley 23 and the power storage spring box 25 is provided on the pulley housing 21. The pulley 23 is rotatably mounted on the connecting shaft 211, and a pull rope is wound around the pulley 23. One side of the pulley 23 is close to the inner wall of the pulley housing 21, and the other side of the pulley 23 is provided with the power storage spring box 25. A [missing information - likely a type of connection] is provided between the pulley 23 and the pulley housing 21. A first coil spring is used to help the rope pulley 23 retract the pull rope; a power storage disc spring box 25 is rotatably mounted on the connecting shaft 211 via a one-way bearing 26. It should be noted that the rotation direction of the one-way bearing 26 is the same as the rotation direction of the rope pulley 23 when pulling the pull rope; a first ratchet 251 is provided on the side of the power storage disc spring box 25 near the rope pulley 23; a pawl 24 corresponding to the first ratchet 251 is provided on the side of the rope pulley 23 near the power storage disc spring box 25. The pawl 24 abuts against the first ratchet 251, so that when the rope pulley 23 rotates with the pull rope, it can drive the power storage disc spring box 25 to rotate through the cooperation of the pawl 24 and the first ratchet 251; a transmission structure 27 is provided on the side of the power storage disc spring box 25 away from the rope pulley 23; the transmission structure 27 is rotatably mounted on the connecting shaft 211; a second coil spring for storing elastic force is also provided between the transmission structure 27 and the power storage disc spring box 25; the transmission structure 27 is also connected to the engine body 1. During implementation, pulling the rope causes the pulley 23 to rotate. The pulley 23 then abuts against the ratchet on the energy storage spring box 25 via the pawl 24, causing the energy storage spring box 25 to rotate with the pulley 23. After the energy storage spring box 25 rotates, it drives the second coil spring to rewind, and the rotational force is transmitted to the transmission structure 27 through the second coil spring. Subsequently, when the pulley 23 retracts the rope under the action of the first coil spring, the energy storage spring box 25 is difficult to rotate in the opposite direction due to the action of the one-way bearing 26. Therefore, the energy storage spring box 25 will not rotate back, while the second coil spring continues to release the stored elastic force, which drives the transmission structure 27 to continue rotating. The process of pulling the rope is then repeated, so that the transmission structure 27 can drive the shaft to maintain continuous rotation. It should be noted that when the second coil spring stores too much spring force, the energy storage disc spring box 25 can drive the one-way bearing 26 to rotate on the connecting shaft 211. Although the one-way bearing 26 can only rotate in one direction, the one-way bearing 26 and the connecting shaft 211 are connected by friction. Therefore, the one-way bearing 26 can overcome the friction and rotate in the opposite direction to protect the second coil spring from damage.

[0020] Two pawls 24 are rotatably mounted on the pulley 23, and the two pawls 24 are symmetrically arranged about the center of the pulley 23. The pawls 24 cooperate with the first ratchet 251 on the energy storage disc spring box 25, so that when the pulley 23 rotates with the pull rope, the pawls 24 abut against the first ratchet 251, driving the energy storage disc spring box 25 to rotate. The pulley 23 is also provided with a protruding connecting post 232, which is used to rotatably connect the pawls 24. A torsion spring is also provided between the pawls 24 and the pulley 23 to help the pawls 24 return to their original position. Under the action of the torsion spring, the pawls 24 are always kept in close contact with the outer surface of the first ratchet 251 on the energy storage disc spring box 25.

[0021] The energy storage disc spring box 25 has an insertion hole 252 in the middle for embedding a one-way bearing 26. The insertion hole 252 is a cylindrical concave hole, and the bottom of the insertion hole 252 also has a through hole for the connecting shaft 211 to pass through. The one-way bearing 26 is located inside the insertion hole 252, and the connecting shaft 211 passes through both the one-way bearing 26 and the through hole at the bottom of the insertion hole 252. The side wall of the insertion hole 252 is provided with a protruding snap-fit ​​strip 253, which abuts against the outer surface of the one-way bearing 26 to clamp the one-way bearing 26. The extension direction of the snap-fit ​​strip 253 is parallel to the central axis of the insertion hole 252. In this example, the outer surface of the one-way bearing 26 is provided with a snap-fit ​​groove 261 that matches the snap-fit ​​strip 253. The extension direction of the snap-fit ​​groove 261 is parallel to the axis of the one-way bearing 26, allowing the snap-fit ​​strip 253 to be embedded in the snap-fit ​​groove 261. This ensures the relative position stability of the one-way bearing 26 and the energy storage disc spring box 25, preventing the one-way bearing 26 from rotating within the insertion hole 252. The end of the snap-fit ​​strip 253 near the opening of the insertion hole 252 is also provided with a rounded corner, facilitating the installation of the one-way bearing 26 into the insertion hole 252 and ensuring that the snap-fit ​​groove 261 on the one-way bearing 26 and the snap-fit ​​strip 253 form a fit.

[0022] The one-way bearing includes a bearing sleeve 262, needle rollers 263, an elastic sheet, and a sealing plate 265. The bearing sleeve 262 is generally annular cylindrical, and a movable groove 266 is provided on one side near the inner wall of the bearing sleeve 262. The movable groove 266 provides space for the needle rollers 263 to move. A square hole 264 is also provided on the side of the movable groove 266 near the inside of the bearing sleeve 262, connecting the inner side of the bearing sleeve 262 with the movable groove 266. It should be noted that the distances between the two ends of the movable groove 266 and the inner wall of the bearing sleeve 262 are different, with the square hole 264 located at one end of the movable groove 266 near the inner wall of the bearing sleeve 262. The needle rollers 263 are generally cylindrical and located within the movable groove 266. The outer circumferential arc surface of the needle rollers 263 can pass through the square hole 264 and enter the bearing. The area inside the sleeve 262 is used to clamp the connecting shaft passing through the bearing sleeve 262. However, the diameter of the square hole 264 is smaller than the outer diameter of the needle roller 263 to prevent the needle roller from disengaging from the square hole into the movable groove. An elastic plate is also provided inside the movable groove 266. The two ends of the elastic plate abut against the inside of the movable groove 266 and the needle roller 263, respectively, to push the needle roller 263 towards the end of the movable groove 266 where the square hole 264 is provided. A sealing plate 265 is provided at the end of the bearing sleeve 262 to cover the end of the needle roller 263 and enclose the needle roller 263 in the movable groove 266. In this example, one end of the movable groove protrudes from the bearing sleeve, and the other end is inside the bearing sleeve. The sealing plate 265 is located on the side of the movable groove that protrudes from the bearing sleeve. In this example, the bearing sleeve 262 is provided with seven movable grooves 266 that are rotationally symmetrical about the axis of the bearing sleeve 262. The elastic plate is V-shaped and is located in the movable groove 266 on the side away from the square hole 264. The snap-fit ​​groove is located on the outer periphery of the bearing sleeve 262, and the direction of the snap-fit ​​groove is parallel to the axis of the bearing sleeve 262. When the connecting shaft passes through the one-way bearing, if the connecting shaft rotates towards the side of the movable groove 266 away from the one-way bearing where the elastic plate is located, the needle roller 263 is pressed against the square hole 264 by the force of the elastic plate. As the one-way bearing rotates, the needle roller 263 in the movable groove 266 continues to be pushed towards the side of the movable groove 266 away from the elastic plate. When the one-way bearing moves away from the elastic plate, the movement of the one-way bearing is restricted by the movable groove 266, and more of the one-way bearing is exposed in the square hole 264, further squeezing the connecting shaft inside the bearing sleeve 262, thus clamping the connecting shaft. Conversely, when the connecting shaft rotates towards the side of the elastic plate, the part of the needle roller 263 exposed in the square hole 264 is moved towards the direction where the elastic plate is located in the movable groove 266 by the friction force of the connecting shaft. At this time, the part of the needle roller 263 exposed in the square hole 264 is reduced, making it difficult for the needle roller 263 to clamp the connecting shaft, thus achieving one-way rotation.

[0023] The end of the pull rope away from the pulley 23 is also provided with a handle; the handle includes a rope frame 222 and a grip 223; the grip 223 is provided with a slot 224 for embedding the rope frame 222; in this example, the overall shape of the grip 223 is T-shaped, and a T-shaped hollow groove is provided in the middle area of ​​the grip 223 as the slot 224. The pull rope is wound on the rope frame 222 and then placed into the grip 223 to realize the connection between the handle and the pull rope; the grip 223 is also provided with a first rope hole connecting the outside of the grip 223 and the inside of the slot 224; the rope frame 222 is provided with a second rope hole for connecting the pull rope.

[0024] The transmission structure 27 includes a second ratchet 271, which is connected to the engine body 1 in a transmission manner; this allows the transmission structure 27 to drive the shaft inside the engine body 1 to rotate, and after the engine is started, the rotation of the shaft will not affect the transmission structure 27.

[0025] A flat washer 272 for limiting the connection is provided at the end of the connecting shaft 211 away from the connecting pull plate housing 21. The flat washer 272 is fixedly connected to the connecting shaft 211 by screws. The flat washer 272 restricts the transmission structure 27, the energy storage disc spring box 25, and the pulley 23 to the connecting shaft 211. In this example, a spring washer is also provided between the flat washer 272 and the transmission structure 27 to prevent the screws from loosening and falling off due to vibrations generated by the operation of the engine body 1.

[0026] The pull plate housing 21 is also provided with a rope hole for the pull rope to pass through. In addition, a nameplate 28 is provided on the pull plate housing 21, which indicates product information and name.

[0027] During implementation, by setting up a power storage disc spring box 25 in conjunction with a one-way bearing 26 and a second coil spring, the tension is converted into the elastic force of the second coil spring for storage and continuous release, keeping the shaft of the engine body 1 able to maintain rotation, facilitating engine starting; by setting up a pawl 24 in conjunction with a first ratchet 251, the rope wheel 23 can drive the power storage disc spring box 25 to rotate in one direction, and reduces interference to the power storage disc spring box 25 when the rope wheel 23 retracts the rope; by setting a snap-fit ​​strip 253 in the embedding hole 252 of the power storage disc spring box 25, in conjunction with the snap-fit ​​groove 261 on the one-way bearing 26, the one-way bearing 26 can maintain stable rotation with the power storage disc spring box 25; by setting up a needle roller 263 in the one-way bearing in conjunction with an elastic plate and a movable groove 266, one-way rotation is achieved when the one-way shaft is sleeved on the connecting shaft.

[0028] The above description is merely a specific example of the present invention and does not constitute any limitation on the present invention. Obviously, those skilled in the art, after understanding the content and principles of the present invention, may make various modifications and changes in form and detail without departing from the principles and structure of the present invention; however, these modifications and changes based on the spirit of the present invention are still within the scope of protection of the claims of the present invention.

Claims

1. An energy storage starting engine, comprising an engine body (1) and a hand-operated crankshaft structure (2), wherein the hand-operated crankshaft structure (2) is tractively connected to the engine body (1) and is used to drive a shaft within the engine body (1) to rotate; characterized in that, The hand-operated pulley structure (2) includes a pulley housing (21), a pull rope, a pulley (23), a pawl (24), a power storage disc spring box (25), a one-way bearing (26), and a transmission structure (27) for transmission connection with the engine body (1); wherein the pulley housing (21) is fixedly connected to the engine body (1), and a connecting shaft (211) for connecting the pulley (23) and the power storage disc spring box (25) is provided on the pulley housing (21); the pulley (23) is rotatably mounted on the connecting shaft (211), and a pull rope is wound on the pulley (23); one side of the pulley (23) is close to the inner wall of the pulley housing (21), and the pulley (24) is further positioned on the pulley housing (25). 3) On the other side, a power storage spring box (25) is provided; a first coil spring is provided between the rope wheel (23) and the pull plate housing (21) to help the rope wheel (23) retract the pull rope; the power storage spring box (25) is rotatably mounted on the connecting shaft (211) via a one-way bearing (26), the rotation direction of the one-way bearing (26) is the same as the rotation direction when the rope wheel (23) pulls the pull rope; a first ratchet (251) is provided on the side of the power storage spring box (25) near the rope wheel (23); a pawl (24) corresponding to the first ratchet (251) is provided on the side of the rope wheel (23) near the power storage spring box (25); the power storage spring box (25) is away from the rope wheel (23). A transmission structure (27) is provided on one side of the bearing (211); the transmission structure (27) is rotatably mounted on the connecting shaft (211); a second coil spring for storing elastic force is also provided between the transmission structure (27) and the energy storage disc spring box (25); the transmission structure (27) is also connected to the engine body (1) in a transmission manner; the one-way bearing (26) includes a bearing sleeve (262), a needle roller (263), an elastic sheet and a sealing plate (265); wherein the bearing sleeve (262) is generally in the shape of an annular column, and a movable groove (266) is provided on the side near the inner wall of the bearing sleeve (262); a square groove is also provided on the side of the movable groove (266) near the inside of the bearing sleeve (262). The square hole (264) connects the inner side of the bearing sleeve (262) with the movable groove (266); the movable groove (266) is also provided with an elastic plate, the two ends of which abut against the inside of the movable groove (266) and the needle roller (263) respectively, for pushing the needle roller (263) towards the end of the movable groove (266) where the square hole (264) is provided; the one-way bearing (26) and the connecting shaft (211) are in friction fit, so that when the spring force stored in the second coil spring is too large, the energy storage disc spring box (25) can drive the one-way bearing (26) to overcome the friction force and rotate in the opposite direction relative to the connecting shaft (211) to protect the second coil spring.

2. The energy storage-start engine according to claim 1, characterized in that, The rope wheel (23) is rotatably provided with two pawls (24), which are symmetrical about the center of the rope wheel (23). The pawls (24) cooperate with the first ratchet (251) on the energy storage disc spring box (25) so that the rope wheel (23) drives the energy storage disc spring box (25) to rotate when the rope is pulled.

3. The energy storage-start engine according to claim 2, characterized in that, The pulley (23) is provided with a protruding connecting post (232), which is used to rotate the connecting pawl (24); a torsion spring is also provided between the pawl (24) and the pulley (23) to help the pawl (24) reset.

4. The energy storage-start engine according to claim 1, characterized in that, The middle part of the energy storage disc spring box (25) is provided with an embedding hole (252) for embedding a one-way bearing (26); the embedding hole (252) is a cylindrical concave hole, and the bottom of the embedding hole (252) is also provided with a through hole for passing through the connecting shaft (211).

5. An energy storage-start engine according to claim 4, characterized in that, The sidewall of the embedded hole (252) is provided with a protruding snap-fit ​​strip (253), which abuts against the outer surface of the one-way bearing (26).

6. An energy storage-start engine according to claim 5, characterized in that, The outer side of the one-way bearing (26) is provided with a snap-fit ​​groove (261) that matches the snap-fit ​​strip (253). The extension direction of the snap-fit ​​groove (261) is parallel to the axis of the one-way bearing (26). The snap-fit ​​strip (253) is embedded in the snap-fit ​​groove (261).

7. An energy storage-start engine according to claim 1, characterized in that, The distance between the two ends of the movable groove (266) and the inner wall of the bearing sleeve (262) is different. The square hole (264) is located in the movable groove (266) at one end close to the inner wall of the bearing sleeve (262). The needle roller (263) is cylindrical in shape and is located in the movable groove (266). The sealing plate (265) is set at the end of the bearing sleeve (262).

8. An energy storage-start engine according to claim 1, characterized in that, The end of the pull rope away from the rope wheel (23) is also provided with a handle; the handle includes a rope frame (222) and a grip (223); the grip (223) is provided with a slot (224) for embedding into the rope frame (222), and the grip (223) is also provided with a first rope hole connecting the outside of the grip (223) and the inside of the slot (224); the rope frame (222) is provided with a second rope hole for connecting the pull rope.

9. An energy storage-start engine according to claim 1, characterized in that, The transmission structure (27) includes a second ratchet (271), which is connected to the engine body (1) in a transmission manner.

10. An energy storage-start engine according to claim 9, characterized in that, The end of the connecting shaft (211) away from the connecting pull plate housing (21) is provided with a flat washer (272) for limiting the position. The flat washer (272) is fixedly connected to the connecting shaft (211) by screws. The flat washer (272) restricts the transmission structure (27), the energy storage disc spring box (25) and the rope wheel (23) to the connecting shaft (211).

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