Improvements in speed reduction devices

Abstract

The utility model relates to an improved structure of speed reducer, include: base, be provided with installation cavity, input shaft, at least partial rotatablely be located in installation cavity, the middle part of input shaft forms transmission shaft section in installation cavity and with the axial direction of input shaft is acute angle offset, undulating wheel, rotatablely cover in transmission shaft section outer periphery and swing up and down with transmission shaft section rotation, the lower surface of undulating wheel is provided with first gear ring, output, at least upper rotatablely be located in installation cavity, the upper surface of output is provided with second gear ring can with first gear ring carry out partial meshing transmission, the inner top wall of installation cavity forms the constraint surface corresponding to undulating wheel upper surface, undulating wheel in up and down swing state, the highest of undulating wheel upper surface always contacts with constraint surface cooperation. The constraint force of above -mentioned structure forms the surface to undulating wheel from its axial direction, makes the load of speed reducer can multiply increase.

Description

Technical Field

[0001] This utility model relates to the field of speed reduction device technology, specifically to an improved structure of a speed reduction device. Background Technology

[0002] With the development and application of automation technology, higher requirements have been placed on speed reduction devices in terms of stability and output performance.

[0003] The applicant's earlier application CN202211549596.1, "Reduction Device," discloses a structure including a housing, an angular shaft, a wave wheel, and an output component. The inner peripheral wall of the housing has a toothed groove extending along the length direction of the angular shaft. A needle roller has its first end rotatably constrained on the outer peripheral wall of the wave wheel, and its second end located within the toothed groove, contacting a corresponding position on the inner sidewall of the groove during the wave wheel's oscillation. During the oscillation of the needle roller with the wave wheel, the needle roller reciprocates along the extension direction of the toothed groove, and the corresponding position of the needle roller contacts the inner sidewall of the groove. The cooperation between the needle roller and the toothed groove restricts the rotation of the wave wheel, causing it to oscillate back and forth only along the length direction of the angular shaft. When the output component is subjected to a reverse load, it can self-lock, restricting reverse rotation and achieving a good self-locking effect.

[0004] The above solution has made significant progress in self-locking performance and precise control of deceleration backlash. However, due to its complex overall assembly structure and numerous assembly gaps, especially for the wave wheel used for wave-type power transmission, which relies solely on axial needle rollers for axial positioning, the needle rollers not only have to bear a large load, affecting their service life, but also greatly limit the output load of the deceleration device.

[0005] Therefore, based on the current structure of the deceleration device, further improvements are needed. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide an improved structure for a speed reduction device that can greatly increase the output load and has a long service life, based on the current state of the technology.

[0007] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows:

[0008] An improved structure of a speed reduction device includes:

[0009] The substrate has an installation cavity;

[0010] An input shaft is at least partially rotatably disposed in a mounting cavity, and a drive shaft section is formed in the middle of the input shaft, which is located in the mounting cavity and is offset at an acute angle to the axial direction of the input shaft.

[0011] The wave wheel is rotatably fitted around the outer periphery of the drive shaft section and swings up and down as the drive shaft section rotates. The lower surface of the wave wheel is provided with a first toothed ring.

[0012] The output component is rotatably disposed in the mounting cavity at least at its upper part, and the upper surface of the output component is provided with a second gear ring capable of partial meshing transmission with the first gear ring;

[0013] The inner top wall of the mounting cavity forms a constraint surface corresponding to the upper surface of the wave wheel. When the wave wheel is swinging up and down, the highest point of the upper surface of the wave wheel is always in contact with the constraint surface.

[0014] The above structure simplifies the assembly structure between the waveguide wheel and the input shaft and output components. It not only reduces assembly errors and saves installation space in the base for installing larger and more stable bearings, thereby increasing the load, but also utilizes the constraint surface formed by the top wall of the base that always abuts against the highest point of the waveguide wheel's upper surface. That is, the constraint force formed on the surface from the axial direction of the waveguide wheel reduces the dependence on the radial constraint force of the waveguide wheel, improves the service life of the reduction device, and enables the load capacity of the reduction device to be multiplied.

[0015] Preferably, the constraint surface forms a first inclined surface that gradually decreases from the outside to the inside along the radial direction of the base, and this first inclined surface is consistent with the inclination trend of the upper surface of the wave wheel in the oscillating state. This structure improves the contact fit between the constraint surface and the upper surface of the wave wheel, enhances the reliability of the constraint on the up-and-down oscillation of the wave wheel, and thus stabilizes and increases the load.

[0016] Preferably, the slope of the first inclined surface and the upper surface of the waveguide wheel in the oscillating state are maintained within a deviation of 0 to 2 degrees. The smaller the slope deviation between the first inclined surface and the upper surface of the waveguide wheel in the oscillating state, the better, preferably not exceeding 2 degrees, so as to improve the limiting effect on the up-and-down oscillation of the waveguide wheel.

[0017] Preferably, the wave wheel is provided with needle rollers extending radially outward, and correspondingly, the sidewall of the base is provided with a limiting groove extending axially, wherein the outer end of the needle rollers is movably constrained in the limiting groove. This structure constrains the wave wheel circumferentially and limits the wave wheel axially up and down through the two ends of the limiting groove, thereby improving the wave wheel's wave transmission effect.

[0018] Preferably, a sliding sleeve that can rotate relative to the needle roller is fitted around the outer periphery of the needle roller, and the sliding sleeve rolls in engagement with the inner wall surface of the limiting groove. Placing the sliding sleeve around the outer periphery of the needle roller and rolling in engagement with the inner wall of the limiting groove reduces direct friction on the needle roller and facilitates assembly.

[0019] Preferably, the inner surface of the sliding sleeve is provided with a groove, which mates with the outer surface of the needle roller to form an oil reservoir. The groove is preferably a mesh-like groove to improve the smoothness of the sliding sleeve's rotation.

[0020] Preferably, the inner bottom wall of the limiting groove slopes upwards from the outside to the inside along the radial direction of the base to form a second inclined surface, which contacts and engages with the lower surface of the needle roller that oscillates to its lowest point with the oscillating wheel. The inner top wall of the limiting groove slopes downwards from the outside to the inside along the radial direction of the base to form a third inclined surface, which contacts and engages with the upper surface of the needle roller that oscillates to its highest point with the oscillating wheel. This structure increases the contact area between the inner wall of the limiting groove and the sliding sleeve in the limiting state, improves the limiting effect, and is beneficial for increasing the load capacity.

[0021] For ease of assembly, the side of the pulsator wheel is provided with a radially extending slot, and the inner end of the needle roller is inserted into the slot.

[0022] In this invention, the wave wheel is formed as a sleeve-shaped structure extending axially. The inner wall of the wave wheel is rotatably engaged with the drive shaft section of the input shaft via a cylindrical roller bearing. Because the upper surface of the wave wheel is axially limited by the top wall of the base, the wave wheel of this invention does not need to be made into a spherical middle section; it can be made into a sleeve-shaped structure. This not only facilitates production and assembly but also increases the limiting contact area between its upper surface and the base, thereby improving load capacity.

[0023] Preferably, the outer ring of the cylindrical roller bearing and the wave wheel form an integral structure, and the inner ring of the cylindrical roller bearing and the drive shaft section of the input shaft form an integral structure. This structure not only facilitates assembly and reduces part fitting and assembly errors, but also allows for further increases in load capacity.

[0024] Preferably, the lower part of the input shaft has a section with a diameter smaller than that of the transmission shaft section and maintained axially along the input shaft. The output component is formed as a sleeve-shaped structure, and the outer circumference of the lower section is rotatably fitted. The inner circumferential wall of the output component is rotatably fitted with the lower section of the input shaft through a tapered roller bearing with a smaller upper end and a larger lower end, and the outer side of the tapered roller bearing is integrally formed with the output component. This structure not only facilitates assembly and reduces part fitting and assembly errors, but also allows for further increases in load capacity.

[0025] Preferably, the outer peripheral wall of the upper section of the input shaft is rotatably fitted with the inner peripheral wall of the base via a first roller bearing; and / or, the outer peripheral wall of the lower part of the output component is rotatably fitted with the inner peripheral wall of the base via a second roller bearing. This structure also helps to reduce part fitting and assembly errors, and further increases the load capacity.

[0026] Compared with the prior art, the advantages of this utility model are as follows: This utility model simplifies the assembly structure between the waveguide wheel and the input shaft and output components, which not only reduces assembly errors and saves installation space in the base for installing larger and more stable bearings, thereby increasing the load, but also utilizes the constraint surface formed by the top wall of the base that always abuts against the highest point of the upper surface of the waveguide wheel, that is, the constraint force formed on the surface from the axial direction of the waveguide wheel, which reduces the dependence on the radial constraint force of the waveguide wheel, improves the service life of the reduction device, and enables the load of the reduction device to be multiplied to meet greater load requirements. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0028] Figure 2 for Figure 1 A schematic diagram of the bottom structure;

[0029] Figure 3 for Figure 1 A sectional view;

[0030] Figure 4 for Figure 3 Enlarged view of section A;

[0031] Figure 5 for Figure 3 Enlarged view of section B;

[0032] Figure 6 This is an exploded view of an embodiment of the present utility model;

[0033] Figure 7 for Figure 6 Enlarged view of section C. Detailed Implementation

[0034] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0035] In the description of this utility model, it should be understood that if terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model.

[0036] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0037] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0038] In this utility model, unless otherwise explicitly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact, or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0039] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this invention are for illustrative purposes only and do not represent the only possible implementation.

[0040] like Figures 1-7 As shown, the improved structure of the deceleration device in this embodiment includes a base 1, an input shaft 2, a wave wheel 3, and an output component 4. The base 1 is provided with a mounting cavity 11. The input shaft 2 is rotatably disposed in the mounting cavity 11 at least partially. A transmission shaft section 22 is formed in the middle of the input shaft 2, located in the mounting cavity 11 and offset at an acute angle from the axial direction of the input shaft 2. The wave wheel 3 is rotatably sleeved on the outer periphery of the transmission shaft section 22 and swings up and down with the rotation of the transmission shaft section 22. A first gear ring 31 is provided on the lower surface of the wave wheel 3. The output component 4 is rotatably disposed in the mounting cavity 11 at least at the upper part. A second gear ring 41 that can partially mesh with the first gear ring 31 is provided on the upper surface of the output component 4.

[0041] The inner top wall of the mounting cavity 11 forms a constraint surface 111 corresponding to the upper surface of the waveguide 3. When the waveguide 3 is swinging up and down, the highest point of its upper surface is always in contact with the constraint surface 111. This structure simplifies the assembly structure between the waveguide 3 and the input shaft 2 and output components. It not only reduces assembly errors and saves mounting space in the base 1 for installing larger, more stable bearings, thus increasing the load, but also utilizes the constraint surface 111 formed on the inner top wall of the base 1, which is always in contact with the highest point of the upper surface of the waveguide 3. This constraint force on the surface formed by the axial direction of the waveguide 3 reduces the dependence on the radial constraint force of the waveguide 3, improves the service life of the reduction gear, and allows the load capacity of the reduction gear to increase exponentially.

[0042] In this embodiment, the constraint surface 111 forms a first inclined surface that gradually decreases from the outside to the inside along the radial direction of the base 1. This first inclined surface is consistent with the tilting trend of the upper surface of the wave wheel 3 in the oscillating state. This structure is adopted to improve the contact fit between the constraint surface 111 and the upper surface of the wave wheel 3, improve the constraint reliability of the wave wheel 3 in its up-and-down oscillation, and thus stabilize and increase the load.

[0043] The slope of the first inclined plane and the upper surface of the wave wheel 3 in the oscillating state are maintained within a deviation of 0 to 2 degrees. The smaller the slope deviation between the first inclined plane and the upper surface of the wave wheel 3 in the oscillating state, the better, preferably not exceeding 2 degrees, so as to improve the limiting effect on the up and down oscillation of the wave wheel 3.

[0044] In this embodiment, the wave wheel 3 is provided with rollers 5 extending radially outward. Correspondingly, the side wall of the base 1 is provided with a limiting groove 12 extending axially. The outer end of the roller 5 is constrained in the limiting groove 12, allowing it to move up and down. This structure constrains the wave wheel 3 circumferentially and limits the wave wheel 3 axially up and down through the two ends of the limiting groove 12, thereby improving the wave transmission effect of the wave wheel 3.

[0045] A sliding sleeve 6, which can rotate relative to the needle roller 5, is fitted around the outer periphery of the needle roller 5. The sliding sleeve 6 rolls with the inner wall surface of the limiting groove 12. The outer end of the needle roller 5 is provided with a limiting edge that matches and limits the movement of the outer end face of the sliding sleeve 6. By placing the sliding sleeve 6 around the outer periphery of the needle roller 5 and rolling it with the inner wall of the limiting groove 12, direct friction on the needle roller 5 is reduced, and assembly is facilitated.

[0046] The inner surface of the aforementioned sliding sleeve 6 is provided with a groove 61, which mates with the outer surface of the needle roller 5 to form an oil reservoir. The groove 61 is preferably a mesh groove 61 to improve the smoothness of rotation of the sliding sleeve 6.

[0047] In this embodiment, the inner bottom wall of the limiting groove 12 slopes upwards from the outside to the inside along the radial direction of the base 1 to form a second inclined surface 121. This second inclined surface 121 contacts and engages with the lower surface of the needle roller 5, which oscillates to its lowest point with the oscillating wheel 3. The inner top wall of the limiting groove 12 slopes downwards from the outside to the inside along the radial direction of the base 1 to form a third inclined surface 122. This third inclined surface 122 contacts and engages with the upper surface of the needle roller 5, which oscillates to its highest point with the oscillating wheel 3. The above structure can increase the contact area between the inner wall of the limiting groove 12 and the sliding sleeve 6 in the limiting state, improve the limiting effect, and help increase the load.

[0048] A plug 13 may be provided at the outer end of the limiting groove 12 to at least partially cover it.

[0049] For ease of assembly, the side of the wave roller 3 is provided with a radially extending slot 32, and the inner end of the needle roller 5 is inserted into the slot 32 for connection.

[0050] In this embodiment, the wave roller 3 is formed as a sleeve-shaped structure extending axially. The inner wall surface of the wave roller 3 is rotatably engaged with the transmission shaft section 22 of the input shaft 2 via a cylindrical roller bearing 10. Since the upper surface of the wave roller 3 is axially limited by the inner top wall of the base 1, the wave roller 3 in this embodiment does not need to be made into a spherical middle section structure, but can be made into a sleeve-shaped structure. This not only facilitates production and assembly, but also increases the limiting contact area between its upper surface and the base 1, thereby improving the load capacity.

[0051] The outer ring of the cylindrical roller bearing 10 is integrally formed with the wave wheel 3, and the inner ring of the cylindrical roller bearing 10 is integrally formed with the drive shaft section 22 of the input shaft 2. This structure not only facilitates assembly and reduces part fitting and assembly errors, but also allows for further increases in load capacity.

[0052] In this embodiment, the lower part of the input shaft 2 has a lower section 23 with a diameter smaller than that of the transmission shaft section 22 and consistent along the axial direction of the input shaft 2. The output component 4 is formed into a sleeve-like structure, and the outer circumference of the lower section 23 is rotatably fitted. The inner circumferential wall of the output component 4 is rotatably fitted with the lower section 23 of the input shaft 2 through a tapered roller bearing 20 with a smaller upper end and a larger lower end, and the outer side of the tapered roller bearing 20 is integrally formed with the output component 4. The above structure not only facilitates assembly and reduces part fitting and assembly errors, but also helps to further increase the load capacity.

[0053] The outer peripheral wall of the upper section 21 of the input shaft 2 is rotatably fitted with the inner peripheral wall of the base 1 via a first roller bearing 30. The outer peripheral wall of the lower part of the output component 4 is rotatably fitted with the inner peripheral wall of the base 1 via a second roller bearing 40. This structure also helps to reduce part fitting and assembly errors, and further increases the load capacity.

[0054] In this embodiment, the bottom locking nut is replaced with a self-made locking sleeve and washer to make the overall structure of the deceleration device more compact and reduce the axial length of the deceleration device.

[0055] In this embodiment, the reduction gear rotates under the drive of the power source. Its transmission shaft section 22 rotates eccentrically relative to the main axis of the input shaft 2. Through a cylindrical roller bearing, it drives the wave wheel 3 to rotate and oscillate up and down. As the wave wheel 3 oscillates, a portion of the first gear ring 31 on its lower surface intermittently meshes with the second gear ring 41 of the output component 4 below it. Thus, the rotation of the wave wheel 3 drives the output component 4 to rotate, achieving power output. The above power transmission process is essentially the same as that of the applicant's prior application CN202211549596.1, and will not be elaborated further here.

[0056] This embodiment simplifies the assembly structure between the waveguide 3, the input shaft 2, and the output component. This not only reduces assembly errors and saves installation space in the base 1 for installing larger and more stable bearings, thereby increasing the load, but also utilizes the constraint surface 111 formed on the inner top wall of the base 1 that always abuts against the highest point of the upper surface of the waveguide 3. That is, the constraint force formed on the surface of the waveguide 3 from the axial direction reduces the dependence on the radial constraint force of the waveguide 3, improves the service life of the reduction device, and enables the load of the reduction device to be multiplied to meet greater load requirements.

[0057] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0058] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. An improved structure of a speed reduction device, comprising: The substrate (1) is provided with an installation cavity (11); An input shaft (2) is at least partially rotatably disposed in a mounting cavity (11), and a transmission shaft section (22) is formed in the middle of the input shaft (2) and is located in the mounting cavity (11) and is offset at an acute angle to the axial direction of the input shaft (2); The wave wheel (3) is rotatably fitted around the outer periphery of the transmission shaft section (22) and swings up and down as the transmission shaft section (22) rotates. The lower surface of the wave wheel (3) is provided with a first toothed ring (31). The output component (4) is rotatably disposed in the mounting cavity (11) at least at the upper part, and the upper surface of the output component (4) is provided with a second gear ring (41) that can partially mesh with the first gear ring (31); The feature is that the inner top wall of the mounting cavity (11) forms a constraint surface (111) corresponding to the upper surface of the wave wheel (3), and the highest point of the upper surface of the wave wheel (3) is always in contact with the constraint surface (111) when the wave wheel (3) is swinging up and down.

2. The improved structure of the deceleration device according to claim 1, characterized in that: The constraint surface (111) forms a first inclined surface that gradually decreases from the outside to the inside along the radial direction of the base (1), and the first inclined surface is consistent with the tilting trend of the upper surface of the wave wheel (3) in the swing state.

3. The improved structure of the deceleration device according to claim 2, characterized in that: The inclination of the first inclined surface and the upper surface of the oscillating wheel (3) in the oscillating state is kept within a deviation of 0 to 2 degrees.

4. The improved structure of the deceleration device according to claim 1, characterized in that: The pulsating wheel (3) is provided with a needle roller (5) extending outward along its radial direction. Correspondingly, the side wall of the base (1) is provided with a limiting groove (12) extending along its axial direction. The outer end of the needle roller (5) is constrained in the limiting groove (12) so that it can move up and down.

5. The improved structure of the deceleration device according to claim 4, characterized in that: The outer periphery of the needle roller (5) is fitted with a sliding sleeve (6) that can rotate relative to the needle roller (5), and the sliding sleeve (6) rolls in contact with the inner wall surface of the limiting groove (12).

6. The improved structure of the deceleration device according to claim 5, characterized in that: The inner surface of the sliding sleeve (6) is provided with a groove (61), which cooperates with the outer surface of the needle roller (5) to form an oil storage groove.

7. The improved structure of the deceleration device according to claim 4, characterized in that: The inner bottom wall of the limiting groove (12) is inclined upward from the outside to the inside along the radial direction of the base (1) to form a second inclined surface (121), which is in contact with the lower surface of the needle roller (5) that moves to the lowest point with the undulating wheel (3).

8. The improved structure of the deceleration device according to claim 4, characterized in that: The inner top wall of the limiting groove (12) is inclined downward from the outside to the inside along the radial direction of the base (1) to form a third inclined surface (122), which is in contact with the upper surface of the needle roller (5) that oscillates to the highest point with the oscillating wheel (3).

9. The improved structure of the deceleration device according to claim 4, characterized in that: The side of the pulsating wheel (3) is provided with a slot (32) extending radially, and the inner end of the needle roller (5) is inserted into the slot (32).

10. The improved structure of the speed reduction device according to any one of claims 1 to 8, characterized in that: The wave wheel (3) is formed as a sleeve-shaped structure extending along the axial direction. The inner wall surface of the wave wheel (3) is rotatably engaged with the transmission shaft section (22) of the input shaft (2) through a cylindrical roller bearing (10).

11. The improved structure of the deceleration device according to claim 10, characterized in that: The outer ring of the cylindrical roller bearing (10) forms an integral structure with the wave wheel (3), and the inner ring of the cylindrical roller bearing (10) forms an integral structure with the transmission shaft section (22) of the input shaft (2).

12. The improved structure of the speed reduction device according to any one of claims 1 to 8, characterized in that: The lower part of the input shaft (2) has a lower section with a diameter smaller than that of the transmission shaft section (22) and which is consistent along the axial direction of the input shaft (2). The output component (4) is formed as a sleeve structure and the outer periphery of the lower section is rotated.

13. The improved structure of the deceleration device according to claim 12, characterized in that: The inner circumferential wall of the output component (4) is rotated with the lower section of the input shaft (2) through a tapered roller bearing (20) with a small upper end and a large lower end, and the outer side of the tapered roller bearing (20) forms an integral structure with the output component (4).

14. The improved structure of the speed reduction device according to any one of claims 1 to 8, characterized in that: The outer peripheral wall of the upper section of the input shaft (2) is rotatably fitted with the inner peripheral wall of the base (1) by a first roller bearing (30); and / or, the outer peripheral wall of the lower part of the output component is rotatably fitted with the inner peripheral wall of the base (1) by a second roller bearing (40).

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