Lifting mechanism for sweeping machine rag

Abstract

The utility model patent relates to a lifting mechanism for a rag of a sweeping machine, comprising a mounting seat slidably arranged on a frame of the sweeping machine and a connecting portion fixedly arranged on the frame of the sweeping machine, a connecting rod extending outwardly rotatably provided on the mounting seat, an eccentric wheel for mounting the rag on the mounting seat rotatably provided, and a driving device for synchronously driving the connecting rod and the eccentric wheel to rotate fixedly provided on the mounting seat; a threaded hole is fixedly provided on the connecting portion, a thread that can form a threaded match with the threaded hole is provided on one end of the connecting rod extending outwardly, and a guiding portion that guides the connecting rod to always form a coaxial arrangement with the threaded hole is fixedly provided on the connecting rod; the thread can be disengaged from the threaded hole under the drive of the driving device, and a rebound component is also provided to prompt the thread on the connecting rod to move toward the threaded hole and find an engagement; the utility model can simulate the human hand to push and rub stains with high viscosity by driving the rag to reciprocate, thereby efficiently cleaning the stains.

Description

Technical Field

[0001] The utility model patent relates to a lifting mechanism for a mop of a sweeping machine. Background Art

[0002] A sweeping robot, also known as an automatic sweeper, smart vacuum cleaner, robot vacuum cleaner, etc., is a type of smart home appliance that can automatically clean the floor in the room with the help of artificial intelligence. It generally uses brushing and vacuuming to absorb the debris on the floor into its own garbage collection box, thereby completing the function of floor cleaning. Generally speaking, robots that complete sweeping, vacuuming, and mopping are also collectively classified as sweeping robots.

[0003] The existing sweeping robot uses a rotating rag to clean the stains on the ground during cleaning, and the current cleaning is just wiping the ground. When encountering stains with high viscosity, simple wiping cannot completely clean the stains. At this time, a mechanism that can clean stains with high viscosity is needed. Utility Model Content

[0004] The purpose of this utility model patent is to provide a lifting mechanism for a sweeping machine rag, which can drive the rag to reciprocate, simulate the human hand to push and rub the stains with high viscosity, and efficiently clean the stains.

[0005] The technical solution to achieve the purpose of the utility model patent is: the utility model patent has a mounting seat slidably arranged on the frame of the sweeping machine and a connecting part fixedly arranged on the frame of the sweeping machine, the mounting seat is rotatably provided with a connecting rod extending outward, the mounting seat is also rotatably provided with an eccentric wheel for mounting a rag, and the mounting seat is fixedly provided with a driving device for synchronously driving the connecting rod and the eccentric wheel to rotate; a threaded hole is fixedly provided on the connecting part, and one end of the connecting rod extending outward is provided with a thread that can form a threaded match with the threaded hole, and a guiding part that guides the connecting rod to always form a coaxial arrangement with the threaded hole is fixedly provided on the connecting rod; the thread on the connecting rod can be disengaged from the threaded hole under the drive of the driving device, and a rebound component is also provided to prompt the thread on the connecting rod to move toward the threaded hole and find an engagement. The mounting seat drives the thread on the connecting rod to disengage from the threaded hole through the driving device, and the rebound component prompts the thread on the connecting rod to move toward the threaded hole to find an engagement and reciprocates and slides on the frame of the sweeping machine.

[0006] Furthermore, the connecting part includes a sleeve with one end fixed on the sweeping machine frame and a base plate fixed on the other end of the sleeve. The threaded hole is fixed inside the sleeve, and a hole is provided on the base plate for the connecting rod to pass through. After the connecting rod passes through the hole, it forms a threaded fit with the threaded hole.

[0007] Furthermore, the guide portion includes an extension rod fixedly disposed on the connecting rod and insertable into the threaded hole, the extension rod being fixedly disposed on one end of the connecting rod having threads, the axial direction of the extension rod coincides with the axial direction of the connecting rod, and the threads are disposed on the connecting rod close to the extension rod.

[0008] Furthermore, the rebound assembly includes a sliding block fixedly set on the connecting rod and a spring sleeved on the connecting rod, the sliding block and the spring are both located inside the sleeve, one end of the spring is fixedly set on the connecting rod or acts on the sliding block, and the other end of the spring is fixedly set on the sleeve or acts on the base plate; the thread is located between the sliding block and the extension rod.

[0009] Furthermore, the rebound assembly includes a sliding block fixedly set on the connecting rod and a spring sleeved on the connecting rod, the sliding block and the spring are both located outside the sleeve, one end of the spring is fixedly set on the connecting rod or acts on the sliding block, and the other end of the spring acts on the mounting seat; the thread is located inside the sleeve.

[0010] Furthermore, the driving device and the connecting part are arranged on the same side of the mounting seat, and the eccentric wheel is arranged on the other side of the mounting seat; a first worm is rotatably provided on the mounting seat, one end of the first worm is fixedly provided on the driving end of the driving device, and the other end of the first worm extends to the outside of the mounting seat and forms a fixed connection with the eccentric wheel, and the eccentric wheel is rotatably provided on the mounting seat under the drive of the driving device.

[0011] Furthermore, a slot is fixedly provided on the eccentric wheel away from the center point, and a block which can be inserted into the slot is provided on the other end of the first worm. The eccentric wheel is fixedly arranged on the first worm through the cooperation of the block and the slot.

[0012] Furthermore, a rotating rod is rotatably provided on the mounting seat, and a first worm wheel that can form a transmission cooperation with the first worm is fixedly provided on the rotating rod; a second worm that is arranged along the extension direction of the rotating rod is also fixedly provided on the rotating rod, and a second worm wheel that can form a transmission cooperation with the second worm is fixedly provided on the connecting rod; the driving device drives the connecting rod to rotate through the transmission cooperation between the first worm and the first worm wheel and the transmission cooperation between the second worm and the second worm wheel.

[0013] Furthermore, limit blocks are symmetrically fixed on the connecting rod, the second worm gear is fixed between the symmetrically arranged limit blocks, the two sides of the second worm gear are fixed on the connecting rod by the restriction of the limit blocks, the connecting rod is provided with an embedding groove, the embedding groove is located between the symmetrically arranged limit blocks, and the embedding groove is provided with a filling block for filling the gap between the second worm gear and the connecting rod.

[0014] The utility model patent has positive effects: (1) the driving device of the utility model drives the connecting rod to rotate, and the thread on the connecting rod disengages with the threaded hole as the connecting rod rotates. When the thread and the threaded hole are disengaged, the connecting rod moves downward, driving the mounting seat to move downward. The downward-moving connecting rod is acted upon by the rebound component, and the connecting rod moves upward. The thread and the threaded hole are re-engaged. When the connecting rod is acted upon by the rebound component and moves upward, the mounting seat moves upward synchronously, and the above steps are repeated; the mounting seat is reciprocatingly slidable under the cooperation of the thread and the threaded hole and the action of the rebound component, and the eccentric wheel on the mounting seat also reciprocates synchronously.

[0015] (2) The rebound assembly of the utility model includes a sliding block fixed on the connecting rod and a spring sleeved on the connecting rod. The sliding block and the spring are both located inside the sleeve. The spring can be compressed when the connecting rod moves downward, and the reaction force is released when the thread and the threaded hole are disengaged, so that the connecting rod moves upward and the thread is re-engaged with the threaded hole, and the thread and the threaded hole are disengaged again, which is more practical.

[0016] (3) The utility model has a slot fixedly provided on the eccentric wheel away from the center point, and a block that can be inserted into the slot is provided on the other end of the first worm. The eccentric wheel is fixed on the first worm through the cooperation of the block and the slot. The eccentric wheel is mounted on the first worm. When the rag and the eccentric wheel are worn or damaged in the later stage, they can be quickly replaced to maintain normal use, which is convenient and efficient.

[0017] (4) The guiding portion of the utility model includes an extension rod fixedly provided on the connecting rod and insertable into the threaded hole. The extension rod is fixedly provided on one end of the connecting rod provided with threads. The axial direction of the extension rod coincides with the axial direction of the connecting rod. The extension rod can guide the connecting rod when it moves down or up, ensuring that the threads on the connecting rod can accurately engage with the threaded hole after being rebounded by the rebound assembly, thereby preventing the connecting rod from deviating after being rebounded by the rebound assembly.

[0018] (5) The driving device of the utility model drives the connecting rod to rotate through the transmission cooperation between the first worm and the first worm wheel and the transmission cooperation between the second worm and the second worm wheel. The setting of the worm wheel and the worm gear prevents the connecting rod from reversing and affecting the driving of the driving device in the opposite direction. At the same time, due to the cooperation between the worm and the turbine, the noise is small and the transmission is smooth.

[0019] (6) The utility model has limit blocks symmetrically fixed on the connecting rod, and the two sides of the second worm gear are fixed on the connecting rod by the limit blocks. The connecting rod is provided with an embedding groove, which is located between the symmetrically arranged limit blocks, and the embedding groove is provided with a filling block. The limit blocks limit the second worm gear, so that the fixed installation of the second worm gear is more stable, and the filling block can fill the gap between the second worm gear and the connecting rod, thereby preventing the second worm gear from shaking when it is lifted or lowered. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to make the content of the utility model patent easier to understand, the utility model patent is further described in detail below based on specific embodiments and in combination with the accompanying drawings, wherein

[0021] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0022] Figure 2 It is a front view of the utility model;

[0023] Figure 3 It is a top view of the utility model;

[0024] Figure 4 This is a schematic diagram of the internal structure of the mounting base of the utility model;

[0025] Figure 5 It is an assembly cross-sectional view of the rebound component in Embodiment 1 of the utility model;

[0026] Figure 6 This is a schematic diagram of the structure in which the second worm gear of the utility model is arranged on the connecting rod;

[0027] Figure 7 It is a schematic diagram of the position of the embedding groove of the utility model;

[0028] Figure 8 It is an assembly cross-sectional view of the rebound component in Example 2 of the utility model. DETAILED DESCRIPTION

[0029] (Example 1)

[0030] See Figures 1 to 7The utility model has a mounting seat 1 slidably arranged on the frame of the sweeping machine and a connecting portion 2 fixedly arranged on the frame of the sweeping machine, the mounting seat 1 is rotatably provided with a connecting rod 3 extending outward, the mounting seat 1 is also rotatably provided with an eccentric wheel 11 for mounting a rag, and the mounting seat 1 is fixedly provided with a driving device 12 for synchronously driving the connecting rod 3 and the eccentric wheel 11 to rotate; a threaded hole 21 is fixedly provided on the connecting portion 2, and a thread 31 that can be matched with the threaded hole 21 is provided on one end of the connecting rod 3 extending outward, and the connecting rod 3 A guide portion 32 is fixedly provided on the upper portion to guide the connecting rod 3 to always form a coaxial arrangement with the threaded hole 21; the thread 31 on the connecting rod 3 can be disengaged from the threaded hole 21 under the drive of the driving device 12, and a rebound component 4 is also provided to prompt the thread 31 on the connecting rod 3 to move toward the threaded hole 21 and find an engagement. The mounting seat 1 is reciprocatingly slidably arranged on the sweeper frame to drive the thread 31 on the connecting rod 3 to disengage from the threaded hole 21 through the driving device 12, and the rebound component 4 prompts the thread 31 on the connecting rod 3 to move toward the threaded hole 21 to find an engagement.

[0031] The sweeping machine frame is a carrier for installing the mounting seat 1 and the connecting part 2, which is convenient for explaining the installation method of the mounting seat 1 and the connecting part 2.

[0032] The threaded teeth of the connecting rod 3 rely on the reaction force of the spring to lift the connecting rod 3 and re-match with the teeth of the threaded hole 21.

[0033] The length of the thread is 14.86mm.

[0034] The threaded hole 21 can be replaced with a detachably fixed nut, and the nut can be replaced after the thread 31 and the threaded hole 21 collide with each other for many times and become worn, thereby extending the service life.

[0035] The connecting part 2 includes a sleeve 22 with one end fixed on the sweeping machine frame and a base plate 23 fixed on the other end of the sleeve 22. The threaded hole 21 is fixed inside the sleeve 22. The base plate 23 is provided with a hole for the connecting rod 3 to pass through. After the connecting rod 3 passes through the hole, it forms a thread 31 to cooperate with the threaded hole 21.

[0036] When a nut is used to replace the threaded hole 21, the upper end of the sleeve 22 is provided with a mounting groove for the nut to be inserted into. When the sleeve 22 is installed, the nut is fixed inside the mounting groove.

[0037] The guide portion 32 includes an extension rod 321 fixedly set on the connecting rod 3 and insertable into the threaded hole 21. The extension rod 321 is fixedly set on one end of the connecting rod 3 where the thread 31 is set. The axial direction of the extension rod 321 coincides with the axial direction of the connecting rod 3. The thread 31 is set on the connecting rod 3 close to the extension rod 321. The diameter of the extension rod 321 is smaller than the diameter of the threaded hole 21. The extension rod 321 will not cooperate with the threaded hole 21, which plays a guiding role in ensuring that the thread 31 can always engage with the threaded hole 21 when the rebound component 4 pushes the connecting rod 3 to move upward, and at the same time can prevent the connecting rod 3 from deviating after being rebounded by the rebound component 4.

[0038] The rebound component 4 includes a sliding block 41 fixedly set on the connecting rod 3 and a spring 42 sleeved on the connecting rod 3. The sliding block 41 and the spring 42 are both located inside the sleeve 22. One end of the spring 42 is fixedly set on the connecting rod 3 or acts on the sliding block 41, and the other end of the spring 42 is fixedly set on the sleeve 22 or acts on the bottom plate 23; the thread 31 is located between the sliding block 41 and the extension rod 321; the side of the sliding block 41 and the inner wall of the sleeve 22 can form a sliding fit or do not interfere with each other, and the sliding block 41 can assist the thread 31 on the connecting rod 3 to seek engagement with the threaded hole 21 when the connecting rod 3 moves up and deflects.

[0039] The spring 42 can be fixed in a detachable manner by welding or by using a connector. When a connector is used for detachable fixing, after the spring 42 is excessively worn out, the mounting seat 1 can be disassembled for replacement.

[0040] The driving device 12 drives the connecting rod 3 to rotate so that the thread 31 disengages from the threaded hole 21. The connecting rod 3 moves downward due to its own rotation and the cooperation between the thread 31 and the threaded hole 21. The downward moving connecting rod 3 compresses the spring 42 sleeved on the connecting rod 3. The spring 42 stores energy after compression. After the thread 31 on the connecting rod 3 is no longer engaged with the threaded hole 21, the stored energy of the spring 42 is released. The released reaction force is large enough to push the thread 31 to re-enter the threaded hole 21 to form an engagement.

[0041] The edge of the sliding block 41 does not contact the inner wall of the sleeve 22 , and the sliding block 41 rotates along with the rotation of the connecting rod 3 , and the sliding block 41 does not collide with the inner wall of the sleeve 22 during rotation.

[0042] The driving device 12 and the connecting part 2 are arranged on the same side of the mounting seat 1, and the eccentric wheel 11 is arranged on the other side of the mounting seat 1; a first worm 13 is rotatably provided on the mounting seat 1, one end of the first worm 13 is fixedly arranged on the driving end of the driving device 12, and the other end of the first worm 13 extends to the outside of the mounting seat 1 and forms a fixed connection with the eccentric wheel 11, and the eccentric wheel 11 is rotatably arranged on the mounting seat 1 under the drive of the driving device 12.

[0043] A slot is fixedly provided on the eccentric wheel 11 away from the center point, and a block which can be inserted into the slot is provided on the other end of the first worm 13. The eccentric wheel 11 is fixed on the first worm 13 through the cooperation of the block and the slot. In the later stage, when the rag and the eccentric wheel 11 are worn or damaged, they can be quickly replaced to maintain normal use, which is convenient and efficient.

[0044] A rotating rod 5 is rotatably provided on the mounting seat 1, and a first worm wheel 51 is fixedly provided on the rotating rod 5 and can form a transmission cooperation with the first worm 13; a second worm 52 is also fixedly provided on the rotating rod 5 and is arranged along the extension direction of the rotating rod 5, and a second worm wheel 33 is fixedly provided on the connecting rod 3 and can form a transmission cooperation with the second worm 52; the driving device 12 drives the connecting rod 3 to rotate through the transmission cooperation between the first worm 13 and the first worm wheel 51 and the transmission cooperation between the second worm 52 and the second worm wheel 33.

[0045] The connecting rod 3 is symmetrically fixed with limit blocks 34, the second worm gear 33 is fixed between the symmetrically arranged limit blocks 34, and the two sides of the second worm gear 33 are fixed on the connecting rod 3 by the restriction of the limit blocks 34. The connecting rod 3 is provided with an embedding groove 35, and the embedding groove 35 is located between the symmetrically arranged limit blocks 34. The embedding groove 35 is provided with a filling block for filling the gap between the second worm gear 33 and the connecting rod 3.

[0046] The working principle of the utility model is as follows: the driving device 12 drives the first worm 13 to rotate, the first worm 13 drives the first worm wheel 51 on the rotating rod 5 to rotate synchronously, the second worm 52 on the rotating rod 5 rotates along with the rotation of the rotating rod 5, the second worm 52 drives the second worm wheel 33 on the connecting rod 3 to rotate, and the rotating second worm wheel 33 drives the connecting rod 3 to rotate; the driving device 12 drives the connecting rod 3 to rotate so that the thread 31 is disengaged from the threaded hole 21, the connecting rod 3 moves downward due to its own rotation and the cooperation between the thread 31 and the threaded hole 21, the downwardly moving mounting seat 1 moves downward synchronously, the downwardly moving connecting rod 3 compresses the spring 42 sleeved on the connecting rod 3, and the spring 42 compresses After that, energy is stored. After the thread 31 on the connecting rod 3 is disengaged from the threaded hole 21, the stored energy of the spring 42 is released. The released reaction force is large enough to push the thread 31 on the connecting rod 3 to re-enter the threaded hole 21 to form an engagement. The spring 42 pushes the connecting rod 3 and also drives the mounting seat 1 to move upward. During this period, the connecting rod 3 is always rotated to disengage, and the thread 31 is disengaged again after being re-engaged with the threaded hole 21. The connecting rod 3 moves down again, and the above-mentioned cooperation is repeated. The eccentric wheel 11 arranged on the driving end of the driving device 12 can be raised and lowered while rotating as the mounting seat 1 moves up and down, and the rag arranged on the eccentric wheel 11 can also be raised and lowered while rotating.

[0047] (Example 2)

[0048] See Figure 8 The rebound assembly 4 of the utility model includes a sliding block 41 fixedly set on the connecting rod 3 and a spring 42 sleeved on the connecting rod 3. The sliding block 41 and the spring 42 are both located outside the sleeve 22. One end of the spring 42 is fixedly set on the connecting rod 3 or acts on the sliding block 41, and the other end of the spring 42 acts on the mounting seat 1; the thread 31 is located inside the sleeve 22.

[0049] Other technical features are consistent with those of Example 1.

[0050] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the utility model patent. It should be understood that the above description is only a specific embodiment of the utility model patent and is not intended to limit the utility model patent. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model patent should be included in the protection scope of the utility model patent.

Claims

1. A lifting mechanism for a sweeping machine rag, characterized in that: The utility model comprises a mounting seat (1) slidably arranged on a frame of a floor sweeper and a connecting portion (2) fixedly arranged on the frame of the floor sweeper, a connecting rod (3) extending outwards being rotatably arranged on the mounting seat (1), an eccentric wheel (11) for mounting a rag being rotatably arranged on the mounting seat (1), a driving device (12) for synchronously driving the connecting rod (3) and the eccentric wheel (11) to rotate being fixedly arranged on the mounting seat (1); a threaded hole (21) being fixedly arranged on the connecting portion (2), a thread (31) being arranged on one end of the connecting rod (3) extending outwards and being matched with the threaded hole (21) to form a thread (31), and a guiding screw (12) being fixedly arranged on the connecting rod (3) The connecting rod (3) always forms a guide portion (32) coaxially arranged with the threaded hole (21); the thread (31) on the connecting rod (3) can be disengaged from the threaded hole (21) under the drive of a driving device (12); a rebound component (4) is also provided to prompt the thread (31) on the connecting rod (3) to move toward the threaded hole (21) and find engagement; the mounting seat (1) is reciprocatingly slidably arranged on the frame of the sweeping machine when the thread (31) on the connecting rod (3) is driven by the driving device (12) to disengage from the threaded hole (21) and the rebound component (4) prompts the thread (31) on the connecting rod (3) to move toward the threaded hole (21) and find engagement.

2. The lifting mechanism for the mop of a sweeping machine according to claim 1 is characterized in that: The connecting portion (2) comprises a sleeve (22) with one end fixedly arranged on the frame of the sweeping machine and a base plate (23) fixedly arranged on the other end of the sleeve (22); the threaded hole (21) is fixedly arranged inside the sleeve (22); a hole is provided on the base plate (23) for the connecting rod (3) to pass through; after the connecting rod (3) passes through the hole, it forms a thread (31) to cooperate with the threaded hole (21).

3. The lifting mechanism for the mop of a sweeping machine according to claim 2 is characterized in that: The guide portion (32) comprises an extension rod (321) fixedly arranged on the connecting rod (3) and insertable into the threaded hole (21); the extension rod (321) is fixedly arranged on one end of the connecting rod (3) provided with a thread (31); the axial direction of the extension rod (321) coincides with the axial direction of the connecting rod (3); and the thread (31) is arranged on the connecting rod (3) near the extension rod (321).

4. The lifting mechanism for the mop of a sweeping machine according to claim 3 is characterized in that: The rebound component (4) comprises a sliding block (41) fixedly arranged on the connecting rod (3) and a spring (42) sleeved on the connecting rod (3); the sliding block (41) and the spring (42) are both located inside the sleeve (22); one end of the spring (42) is fixedly arranged on the connecting rod (3) or acts on the sliding block (41); the other end of the spring (42) is fixedly arranged on the sleeve (22) or acts on the bottom plate (23); the thread (31) is located between the sliding block (41) and the extension rod (321).

5. The lifting mechanism for the mop of a sweeping machine according to claim 3 is characterized in that: The rebound component (4) comprises a sliding block (41) fixedly arranged on the connecting rod (3) and a spring (42) sleeved on the connecting rod (3); the sliding block (41) and the spring (42) are both located outside the sleeve (22); one end of the spring (42) is fixedly arranged on the connecting rod (3) or acts on the sliding block (41), and the other end of the spring (42) acts on the mounting seat (1); the thread (31) is located inside the sleeve (22).

6. The lifting mechanism for the mop of a sweeping machine according to claim 1, characterized in that: The driving device (12) and the connecting portion (2) are arranged on the same side of the mounting seat (1), and the eccentric wheel (11) is arranged on the other side of the mounting seat (1); a first worm (13) is rotatably arranged on the mounting seat (1), one end of the first worm (13) is fixedly arranged on the driving end of the driving device (12), and the other end of the first worm (13) extends to the outside of the mounting seat (1) and forms a fixed connection with the eccentric wheel (11); the eccentric wheel (11) is rotatably arranged on the mounting seat (1) under the drive of the driving device (12).

7. The lifting mechanism for the mop of a sweeping machine according to claim 6, characterized in that: A slot is fixedly provided on the eccentric wheel (11) away from the center point, and a block that can be inserted into the slot is provided on the other end of the first worm (13). The eccentric wheel (11) is fixedly arranged on the first worm (13) through the cooperation of the block and the slot.

8. The lifting mechanism for the mop of a sweeping machine according to claim 6, characterized in that: A rotating rod (5) is rotatably provided on the mounting seat (1), and a first worm wheel (51) is fixedly provided on the rotating rod (5) and can form a transmission cooperation with the first worm (13); a second worm (52) is also fixedly provided on the rotating rod (5) and is arranged along the extension direction of the rotating rod (5); a second worm wheel (33) is fixedly provided on the connecting rod (3) and can form a transmission cooperation with the second worm (52); the driving device (12) drives the connecting rod (3) to rotate through the transmission cooperation between the first worm (13) and the first worm wheel (51) and the transmission cooperation between the second worm (52) and the second worm wheel (33).

9. The lifting mechanism for the mop of a sweeping machine according to claim 8, characterized in that: The connecting rod (3) is symmetrically fixed with limit blocks (34), the second worm gear (33) is fixedly arranged between the symmetrically arranged limit blocks (34), both sides of the second worm gear (33) are fixedly arranged on the connecting rod (3) through the restriction of the limit blocks (34), the connecting rod (3) is provided with an embedding groove (35), the embedding groove (35) is located between the symmetrically arranged limit blocks (34), and the embedding groove (35) is provided with a filling block for filling a gap between the second worm gear (33) and the connecting rod (3).

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