Detachable protection mechanism of gear and transmission device

Abstract

The invention discloses a detachable protection mechanism of a gear and a transmission device.The detachable protection mechanism of the gear comprises a gear body, a supporting column, a base and a protection assembly arranged on the base; the protection assembly comprises a first protection cover, a second protection cover, a first sliding seat, a second sliding seat, a threaded rod with reverse threads and plugs fixedly connected to the two ends of the threaded rod. The gear body is lubricated through the oil injection assembly, abrasion is reduced, the service life is prolonged, the maintenance cost is reduced, meanwhile, noise is lowered, and operation stability is improved. The gear body is covered with the protection cover when the protection assembly is transported, the transportation risk is reduced, and the damage rate is reduced. The limiting knocking assembly effectively removes dust on the gear body, mechanical faults are reduced, efficient operation of the gear is ensured, the system operation efficiency and precision are improved, the service life of the gear is further prolonged, and the maintenance cost is reduced. The design jointly improves the performance and reliability of the gear mechanism.

Description

Technical Field

[0001] This invention relates to the field of transmission machinery technology, and in particular to a detachable protective mechanism and transmission device for gears. Background Technology

[0002] As a core component in the field of mechanical transmission, gears, with their toothed rims, enable efficient transmission of motion and power through continuous meshing, highlighting their crucial role in various mechanical equipment. However, existing gear mechanisms still face significant technical bottlenecks, hindering performance improvements and maintenance efficiency in transmission systems. While bidirectional toothed gears generally employ an integrated molding design, meeting basic transmission requirements, this design also introduces significant drawbacks. The gear body is susceptible to damage from external impacts during transportation, and when a tooth pattern in one direction fails due to wear or impact, the entire gear must be replaced, significantly increasing maintenance costs. More importantly, if the integrated gear's tooth pattern is damaged due to excessive friction (such as localized wear, fracture, or defects), it directly compromises meshing accuracy, reducing transmission efficiency and causing vibration and increased noise, seriously threatening the stability and reliability of the gear and even the entire machine, potentially leading to equipment failure and downtime. These problems underscore the urgent need for a new gear mechanism that can effectively address these technical bottlenecks. Summary of the Invention

[0003] This invention provides a detachable protective mechanism and transmission device for gears to solve the technical problem in the prior art where the gear body is easily damaged by external impacts, resulting in the need to replace the entire gear and significantly increasing maintenance costs.

[0004] In view of the above technical problems, embodiments of the present invention provide a detachable protective mechanism for a gear, including a gear body, a support column sleeved on the gear body, a base fixedly connected to the end face of the support column away from the gear body, and a protective component disposed on the base. The protective component includes a first protective cover, a second protective cover, a first sliding seat fixedly disposed at the opening end of the first protective cover, a second sliding seat fixedly disposed at the opening end of the second protective cover, a threaded rod with reverse threads threaded to the first sliding seat and the second sliding seat, and plugs fixedly connected to both ends of the threaded rod. Sliding components are provided between the first protective cover and the second protective cover and the base. By rotating the plugs, the first protective cover and the second protective cover are brought closer and fitted together to protect the gear body; or they are separated to expose the gear body.

[0005] Optionally, the sliding assembly includes a connecting plate fixedly connected to the bottom wall of the first sliding seat / second sliding seat, a slide groove disposed on the base, a slider slidably installed in the slide groove, and a protective spring connected between the connecting plate and the slider.

[0006] Optionally, the detachable protective mechanism of the gear further includes an oil storage chamber and a movable chamber disposed in the hollow groove of the gear body, and a sealing plate for covering the oil storage chamber and the movable chamber is detachably installed on the gear body.

[0007] Optionally, the detachable protective mechanism of the gear further includes an oil injection assembly disposed between the oil storage chamber and the movable chamber. The oil injection assembly includes a steel ball disposed in the movable chamber and a movable seal slidably installed in the oil storage chamber. The movable seal includes a sliding frame slidably installed radially along the oil storage chamber, a linkage member fitted to the inner wall of the movable chamber and fixedly connected to the sliding frame, a return plate fixedly installed in the oil storage chamber and fixedly connected to the sliding frame, a return spring abutting between the return plate and the inner wall of the oil storage chamber, and an oil sealing block fixedly connected to the end face of the sliding frame away from the linkage member. The oil storage chamber is provided with an oil outlet disposed opposite to the oil sealing block.

[0008] Optionally, at least two sets of the oil injection components are provided, and the two sets of oil injection components are arranged axially symmetrically on both sides of the center of the gear body.

[0009] Optionally, the detachable protective mechanism of the gear further includes a limiting striking assembly, which includes an L-shaped hinge rod hinged to the base and a rubber rod hinged to the L-shaped hinge rod, the rubber rod having a bent portion that matches the threaded rod.

[0010] Optionally, the side wall of the L-shaped hinge rod is hinged with a limiting plate for clamping the rubber rod.

[0011] The present invention also provides a transmission device including a detachable protective mechanism for the aforementioned gear.

[0012] In this invention, by incorporating protective components, a protective cover can be used to enclose the gear body during transportation, preventing damage from impacts. This design minimizes transportation risks, ensuring the gear arrives at its destination in good condition, significantly reducing gear damage rates caused by transportation, and improving transportation efficiency and quality. Through this protective measure, the gear is adequately protected during transportation, reducing damage caused by external impacts, thereby lowering maintenance costs and equipment replacement frequency.

[0013] In this invention, an oil injection component is incorporated to lubricate the gear body, resulting in smoother meshing and rotation. This device sprays lubricating oil onto the meshing points as the gear body rotates, effectively preventing gear damage caused by excessive friction. This design significantly extends the gear's service life and reduces frequent replacement and maintenance costs due to wear. The timely supply of lubricating oil forms an effective protective film, reducing heat generated by friction and preventing adverse effects of high temperatures on gear material properties, thereby maintaining gear precision and transmission efficiency. Furthermore, this mechanism significantly reduces noise during gear operation, improves the stability and reliability of the entire equipment, and provides strong support for the continuous and efficient operation of related mechanical systems.

[0014] In this invention, by incorporating a limiting striking component, dust accumulated on the gear body can be removed extremely effectively. This design significantly improves the stability and reliability of the gear body's subsequent operation, reducing the probability of mechanical failures caused by dust accumulation. Regular dust removal effectively prevents the impact of dust accumulation on subsequent operation, allowing the gear to operate continuously and efficiently, ensuring it remains in good working condition. This mechanism not only improves the overall efficiency and precision of the mechanical system but also significantly extends the gear's lifespan, reducing maintenance costs and equipment replacement frequency. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the detachable protective mechanism of the gear in the engagement state according to an embodiment of the present invention;

[0017] Figure 2 This is a schematic diagram of the detachable protective mechanism of the gear in an embodiment of the present invention in its unfolded state;

[0018] Figure 3 This is a schematic diagram of another fitted state of the detachable protective mechanism for gears in one embodiment of the present invention;

[0019] Figure 4 This is a schematic diagram of another unfolded state of the detachable protective mechanism for gears in one embodiment of the present invention;

[0020] Figure 5 yes Figure 4 A structural diagram of section B;

[0021] Figure 6 yes Figure 2 A schematic diagram of the structure of part A.

[0022] The reference numerals in the accompanying drawings are as follows:

[0023] 1-Base, 2-Support column, 3-Gear body, 31-Oil storage chamber, 32-Moving chamber, 33-Sealing plate, 4-Protective assembly, 41-First protective cover, 42-Second protective cover, 43-First sliding seat, 44-Second sliding seat, 45-Threaded rod, 46-Plug, 5-Sliding assembly, 51-Connecting plate, 52-Slide groove, 53-Slider, 54-Protective spring, 6-Oil injection assembly, 61-Steel ball bearing, 62-Sliding frame, 63-Linkage component, 64-Return plate, 65-Reset spring, 66-Oil sealing block, 67-Oil outlet, 7-Limiting and striking assembly, 71-L-shaped hinge rod, 72-Rubber rod, 721-Bending part, 73-Limiting plate. Detailed Implementation

[0024] To make the technical problems solved, the technical solutions, and the beneficial effects of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0025] In the description of this invention, it should be understood that the terms "longitudinal," "radial," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0026] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0027] like Figures 1 to 6As shown, an embodiment of the present invention provides a detachable protective mechanism for a gear, including a gear body 3, a support column 2 sleeved on the gear body 3, a base 1 fixedly connected to the end face of the support column 2 away from the gear body 3, and a protective component 4 disposed on the base 1. The protective component 4 includes a first protective cover 41, a second protective cover 42, a first sliding seat 43 fixedly disposed at the opening end of the first protective cover 41, a second sliding seat 44 fixedly disposed at the opening end of the second protective cover 42, a threaded rod 45 with reverse threads threaded to the first sliding seat 43 and the second sliding seat 44, and plugs 46 fixedly connected to both ends of the threaded rod 45. Sliding components 5 are provided between the first protective cover 41 and the second protective cover 42 and the base 1. By rotating the plugs 46, the first protective cover 41 and the second protective cover 42 are brought closer and fitted together to protect the gear body 3; or they are separated to expose the gear body 3.

[0028] Understandably, the protective component 4 enables flexible switching between protection and exposure of the gear body 3. During transport or when idle, rotating the plug 46 drives the threaded rod 45 to rotate, utilizing the characteristics of the reverse thread to bring the first sliding seat 43 and the second sliding seat 44 closer together. This, in turn, pushes the first protective cover 41 and the second protective cover 42 to fit together, forming a closed protective shell that completely encloses the gear body 3. This effectively prevents damage to the gear from external impacts during transport, significantly reducing transport risks and ensuring the integrity and precision of the gear body 3, providing reliable protection for subsequent installation and use. When the gear body 3 needs to be used, rotating the plug 46 in the reverse direction causes the threaded rod 45 to move the sliding seats away, separating the protective covers and completely exposing the gear body 3. Furthermore, with the cooperation of the sliding component 5, the first protective cover 41 and the second protective cover 42 can move stably above the base 1. The sliding component 5 provides guidance and displacement stability for the two protective covers, ensuring controllable movement trajectories. This detachable protective mechanism design not only improves the adaptability and safety of the gear body 3 under different working conditions.

[0029] In one embodiment, such as Figures 1 to 4As shown, the sliding assembly 5 includes a connecting plate 51 fixedly connected to the bottom wall of the first sliding seat 43 / second sliding seat 44, a slide groove 52 disposed on the base 1, a slider 53 slidably installed in the slide groove 52, and a protective spring 54 connecting the connecting plate 51 and the slider 53. Understandably, the connecting plate 51 connects the first sliding seat 43 and the second sliding seat 44 to the slider 53, allowing the movement of the sliding seats to be achieved by the slider 53 sliding within the slide groove 52, ensuring the smoothness and guidance of the sliding process. The protective spring 54 plays a crucial role in buffering and resetting. When the protective assembly 4 is subjected to external force, the protective spring 54 can absorb some of the impact energy, preventing damage to the gear body 3; simultaneously, after the external force disappears, the elastic restoring force of the protective spring 54 allows the two sliding seats and two protective covers to automatically return to their initial positions.

[0030] In one embodiment, such as Figures 1 to 4 As shown, the detachable protective mechanism of the gear also includes an oil storage chamber 31 and a movable chamber 32 disposed in the hollow groove of the gear body 3. A sealing plate 33 is detachably installed on the gear body 3 to cover the oil storage chamber 31 and the movable chamber 32. Understandably, the oil storage chamber is used to store lubricating oil. The design of the sealing plate not only ensures the sealing of the lubricating oil in the oil storage chamber, preventing lubricating oil leakage or the entry of external impurities, but also makes the maintenance and cleaning of the oil storage chamber and the movable chamber more convenient.

[0031] In one embodiment, such as Figures 4 to 5As shown, the detachable protective mechanism of the gear also includes an oil injection assembly 6 disposed between the oil storage chamber 31 and the movable chamber 32. The oil injection assembly 6 includes a steel ball bearing 61 disposed in the movable chamber 32 and a movable sealing member slidably installed in the oil storage chamber 31. The movable sealing member includes a sliding frame 62 slidably installed radially along the oil storage chamber 31, a linkage member 63 fitted against the inner wall of the movable chamber 32 and fixedly connected to the sliding frame 62, a return plate 64 fixedly installed in the oil storage chamber 31 and fixedly connected to the sliding frame 62, a return spring 65 abutting between the return plate 64 and the inner wall of the oil storage chamber 31, and an oil sealing block 66 fixedly connected to the end face of the sliding frame 62 away from the linkage member 63. The oil storage chamber 31 is provided with an oil outlet 67 disposed opposite to the oil sealing block 66. Understandably, when the gear body 3 rotates, the steel balls 61 in the movable cavity 32 roll under centrifugal force. When they contact the linkage 63, they push the sliding frame 62 to slide radially along the oil storage cavity 31, compressing the return spring 65 and causing the oil sealing block 66 to move away from the oil outlet 67. Lubricating oil then flows out from the oil storage cavity 31 to lubricate the gear. This process not only ensures timely supply of lubricating oil during the operation of the gear body 1, effectively reducing wear and noise between gears, but also, through the elastic restoring force of the return spring 65, allows the oil sealing block 66 to automatically seal the oil outlet 67 when the gear stops rotating, preventing lubricating oil leakage and improving the efficiency of lubricating oil use. This structure achieves intelligent control of "lubrication upon rotation and sealing upon stillness" through a purely mechanical structure, and also has low maintenance costs.

[0032] In one embodiment, such as Figures 4 to 5 As shown, at least two sets of the lubrication components 6 are provided, and the two sets of lubrication components 6 are arranged axially symmetrically on both sides of the center of the gear body 3. Understandably, this symmetrical arrangement allows the lubricating oil to be more evenly distributed in the meshing area of ​​the gear during operation, thereby effectively reducing wear on both sides of the gear body 1 and improving its service life and transmission accuracy. Simultaneously, the symmetrical arrangement of the lubrication components 6 also enhances the stability of the gear body 1 during operation, reducing vibration and noise caused by uneven lubrication.

[0033] In one embodiment, such as Figure 3 , Figure 6 As shown, the detachable protective mechanism of the gear also includes a limiting striking assembly 7. The limiting striking assembly 7 includes an L-shaped hinge rod 71 hinged to the base 1 and a rubber rod 72 hinged to the L-shaped hinge rod 71. The rubber rod 72 has a bent portion 721 that matches the threaded rod 45. Understandably, the bent portion 721 of the rubber rod 72 matches the threaded rod 45, ensuring that the rubber rod 72 can accurately contact the outer wall of the gear teeth of the gear body 1 when the gear body 3 rotates.

[0034] In one embodiment, such as Figure 3 , Figure 6 As shown, the side wall of the L-shaped hinge rod 71 is hinged with a limiting plate 73 for clamping the rubber rod 72. Understandably, when the gear body 3 rotates, the protrusions of its gears (each tooth) periodically press the rubber rod 72 downwards. After the gear protrusions have rotated, the rubber rod 72, relying on its own elastic rebound, strikes the gear body 3. This striking action effectively removes accumulated dust and impurities from the gear body 3, reducing mechanical failures caused by dust accumulation, thereby significantly improving the operational stability and reliability of the gear body 3. Thus, through the composite design of the L-shaped hinge rod 71 and the rubber rod 72, the functions of transportation fixation and dynamic dust removal are integrated into a single mechanism. This ensures the integrity of the gear body 1 during transportation while improving operational cleanliness, providing a low-cost, high-reliability proactive maintenance solution for high-precision gear systems.

[0035] The present invention also provides a transmission device including the aforementioned detachable protective mechanism for gears. In the detachable protective mechanism for gears in the above embodiments of the present invention, the detachable protective mechanism for gears includes a gear body 3, a support column 2 sleeved on the gear body 3, a base 1 fixedly connected to the end face of the support column 2 away from the gear body 3, and a protective component 4 disposed on the base 1. The protective component 4 includes a first protective cover 41, a second protective cover 42, a first sliding seat 43 fixedly disposed at the opening end of the first protective cover 41, a second sliding seat 44 fixedly disposed at the opening end of the second protective cover 42, a threaded rod 45 with reverse threads threaded to the first sliding seat 43 and the second sliding seat 44, and plugs 46 fixedly connected to both ends of the threaded rod 45. Sliding components 5 are provided between the first protective cover 41 and the second protective cover 42 and the base 1. By rotating the plugs 46, the first protective cover 41 and the second protective cover 42 are brought closer together and fitted to each other to protect the gear body 3; or they are separated to expose the gear body 3.

[0036] The working process of the detachable protective mechanism for the gears in the transmission device of the present invention is as follows:

[0037] During the rotation of the gear body 3, the steel balls 61 in the movable cavity 32 roll under the action of centrifugal force. When the steel balls 61 roll and contact the linkage 63 with the guide slope, they push the linkage 63 towards the oil storage cavity 31. Since the return plate 64 is fixed, the sliding frame 62 will slide radially in the oil storage cavity 31, thereby compressing the return spring 65. The reaction force of the return spring 65 causes the sliding frame 62 to drive the sealing block 66 to move radially towards the movable cavity 32. At this time, the sealing block 66 no longer blocks the oil outlet 67, and the lubricating oil stored in the oil storage cavity 31 can flow out from the oil outlet 67 to lubricate the gears of the gear body 3, effectively preventing the gears from being damaged due to excessive friction when meshing with other gears. When the gear body 3 stops rotating, the steel balls 61 also stop rolling, and the sealing block 66 returns to its original position under the pushing force of the return spring 65, re-sealing the oil outlet 67 to prevent lubricating oil from leaking when the gear body 3 is stationary.

[0038] When transporting the gear body 3, the first protective cover 41 and the second protective cover 42, which are currently separated, must be switched to a closed state. First, the hinge rod is rotated away from the gear body 3, at which point the threaded rod 45 is no longer restricted by the bend 721 of the rubber rod 72. Next, the connecting plate 51 moves upward under the thrust of the protective spring 54, causing the first protective cover 41 and the second protective cover 42 to move upward synchronously. Subsequently, the plug 46 is rotated, causing the threaded rod 45 to rotate. The rotation of the threaded rod 45 causes the first sliding seat 43 and the second sliding seat 44 to move closer to each other until the opening end of the first protective cover 41 and the opening end of the second protective cover 42 are tightly fitted together, forming a closed protective shell that completely encloses the gear body 3, thereby preventing damage to the gears of the gear body 3 due to impact during transportation.

[0039] When the gear body 3 is ready for use after transportation, the plug 46 is rotated in the reverse direction, causing the threaded rod 45 to rotate in the reverse direction. The rotation of the threaded rod 45 causes the first sliding seat 43 and the second sliding seat 44 to move away from each other until the first protective cover 41 and the second protective cover 42 are fully exposed above the gear body 3. At this time, the first protective cover 41 and the second protective cover 42 are pressed down, causing the connecting plate 51 to move downward. The downward movement of the connecting plate 51 compresses the protective spring 54. When the first protective cover 41 and the second protective cover 42 move below the gear body 3, the hinge rod is rotated to restrict the threaded rod 45 within the bend 721 of the hinge rod, thereby fixing the first protective cover 41 and the second protective cover 42 and fully exposing the gear body 3, thus avoiding affecting the meshing of the gear body 3 with other gears.

[0040] After the hinge rod fixes the threaded rod 45, rotate the rubber rod 72 so that the end of the rubber rod 72 away from the hinge rod is close to the gear body 3. The rubber rod 72 contacts the outer wall of the gear body 3. At this time, rotate the limiting plate 73 to lock the rubber rod 72 into the limiting groove (not shown in the figure) of the limiting plate 73, so that the rubber rod 72 can move within a certain range. When the gear rotates, the gear protrusion of the gear body 3 presses the rubber rod 72 down. After the gear protrusion has rotated, the rubber rod 72 springs back to its original position and taps the gear body 3 to remove the dust accumulated on the gear body 3.

[0041] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A detachable protective mechanism for a gear, characterized in that, The system includes a gear body (3), a support column (2) sleeved on the gear body (3), a base (1) fixedly connected to the end face of the support column (2) away from the gear body (3), and a protective component (4) disposed on the base (1). The protective component (4) includes a first protective cover (41), a second protective cover (42), a first sliding seat (43) fixedly disposed at the opening end of the first protective cover (41), a second sliding seat (44) fixedly disposed at the opening end of the second protective cover (42), a threaded rod (45) with reverse threads threaded to the first sliding seat (43) and the second sliding seat (44), and plugs (46) fixedly connected to both ends of the threaded rod (45). Sliding components (5) are disposed between the first protective cover (41) and the second protective cover (42) and the base (1). By rotating the plug (46), the first protective cover (41) and the second protective cover (42) are brought closer together and fitted to each other to protect the gear body (3); or they are separated to expose the gear body (3).

2. The detachable protective mechanism for the gear according to claim 1, characterized in that, The sliding assembly (5) includes a connecting plate (51) fixedly connected to the bottom wall of the first sliding seat (43) / second sliding seat (44), a slide groove (52) disposed on the base (1), a slider (53) slidably installed in the slide groove (52), and a protective spring (54) connected between the connecting plate (51) and the slider (53).

3. The detachable protective mechanism for gears according to claim 2, characterized in that, It also includes an oil storage chamber (31) and a movable chamber (32) disposed in the hollow groove of the gear body (3), and a sealing plate (33) is detachably installed on the gear body (3) to cover the oil storage chamber (31) and the movable chamber (32).

4. The detachable protective mechanism for the gear according to claim 3, characterized in that, It also includes an oil injection assembly (6) disposed between the oil storage cavity (31) and the movable cavity (32). The oil injection assembly (6) includes a steel ball (61) disposed in the movable cavity (32) and a movable sealing member slidably installed in the oil storage cavity (31). The movable sealing member includes a sliding frame (62) slidably installed radially along the oil storage cavity (31), a linkage member (63) fitted to the inner wall of the movable cavity (32) and fixedly connected to the sliding frame (62), a return plate (64) fixedly installed in the oil storage cavity (31) and fixedly connected to the sliding frame (62), a return spring (65) abutting between the return plate (64) and the inner wall of the oil storage cavity (31), and an oil sealing block (66) fixedly connected to the end face of the sliding frame (62) away from the linkage member (63). The oil storage cavity (31) is provided with an oil outlet (67) disposed opposite to the oil sealing block (66).

5. The detachable protective mechanism for the gear according to claim 4, characterized in that, The oil injection assembly (6) is provided in at least two sets, and the two sets of oil injection assemblies (6) are arranged on both sides of the center of the gear body (3) in an axially symmetrical manner.

6. The detachable protective mechanism for the gear according to claim 2, characterized in that, It also includes a limiting striking assembly (7), which includes an L-shaped hinge rod (71) hinged to the base (1) and a rubber rod (72) hinged to the L-shaped hinge rod (71). The rubber rod (72) is provided with a bent portion (721) that matches the threaded rod (45).

7. The detachable protective mechanism for the gear according to claim 6, characterized in that, The side wall of the L-shaped hinge rod (71) is hinged with a limiting plate (73) for clamping the rubber rod (72).

8. A transmission device, characterized in that, Includes a detachable protective mechanism for the gear as described in any one of claims 1-7.

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