A non-invasive assembly structure for a harmonic reducer wave generator

Abstract

The application discloses a non-damage assembly structure for a harmonic reducer wave generator and belongs to the technical field of reducers. The wave generator comprises a cam and a flexible bearing. The non-damage assembly structure comprises a positioning base, a multi-section entity and a pressure mechanism. The positioning base is internally provided with a through hole and is provided with a first step portion at one end. The first step portion is matched with the flexible bearing. The multi-section entity comprises oppositely arranged first and second ends. The outer edge of the first end is consistent with the shape of the outer edge of the cam and is used for matching the cam. The second end is a circular structure and is used for being sleeved in the flexible bearing. The pressure mechanism comprises a positioning hole and a pressing assembly which are correspondingly arranged upward and downward. The positioning base is matched with the positioning hole. The pressing assembly can press the multi-section entity. The application can avoid the damage of the inner hole surface of the flexible bearing, solves the problems of poor assembly, low assembly efficiency and poor assembly stability and the like.

Description

Technical Field

[0001] This invention belongs to the field of speed reducer technology, and specifically relates to a non-destructive assembly structure for a harmonic speed reducer wave generator.

[0002] This case is a divisional application of application number 202311428319.X, entitled "A non-destructive assembly structure for a harmonic reducer wave generator", with the original application filed on October 31, 2023. Background Technology

[0003] Harmonic reducers consist of a rigid wheel, a flexible wheel, and a wave generator. They utilize the controllable elastic deformation wave generated by the flexible wheel to cause relative tooth misalignment between the teeth of the rigid wheel and the flexible wheel, thereby transmitting power and motion. The wave generator is assembled from a specially curved cam and a flexible bearing. However, during assembly, problems such as the introduction of foreign objects, workpiece scratches, and inaccurate positioning of the workpiece and tooling can easily cause eccentricity between the flexible wheel and the wave generator, and between the flexible bearing and the cam, affecting the transmission accuracy of the harmonic reducer.

[0004] The invention patent with authorization number CN109442026B discloses a device for assembling a harmonic reducer, including a chassis and a pressing assembly. There are two sets of pressing assemblies, which are respectively installed at both ends of the chassis. The chassis includes a base, a support plate and an adjusting ring. The base is located below the support plate and the adjusting ring is fixedly installed above the support plate. The pressing assembly includes a vertical plate and a pressure plate. Sliding blocks are connected to both ends of the pressure plate and one end of the sliding block is connected to the vertical plate. The method of using the above-mentioned device for assembling a harmonic reducer is as follows: (1) fixing the rigid wheel; (2) installing the flexible wheel and wave generator; (3) installing the whole assembly with the input shaft. The invention has a simple structure and is easy to use. It can prevent grease from leaking into the motor and other parts during the installation process, making the installation work cleaner and ensuring the cleanliness of the site.

[0005] Patent CN114799818B relates to an automated pressing fixture and method for a wave generator. The fixture includes: a fixed base, independently fixed; a through-hole in the fixed base into which a flexible wheel is placed; a clamping device for fixing the flexible wheel to the fixed base; an upper plate that moves vertically above the fixed base; a shaping device at the bottom of the upper plate; the shaping device includes a vertically moving vertical slider, two symmetrically arranged abutment blocks on both sides of the vertical slider, and a transmission structure for linking the abutment blocks and the vertical slider; a lower plate that moves vertically below the fixed base; a placement groove at the top of the lower plate; an upwardly extending clamping rod within the placement groove; a first spring and a movable plate sequentially mounted on the clamping rod from bottom to top; and a wave generator placed on the movable plate. This invention provides an automated pressing fixture and method for a wave generator, effectively solving the problem of scratches on components during pressing.

[0006] However, in the aforementioned prior art, the assembly problem of the flexible bearing and cam in the wave generator has not been improved. In the process of pressing the rigid cam with a special curve into the inner ring surface of the flexible bearing, not only is the assembly difficult, but the flexible bearing is also prone to scratches and abrasions due to uneven force, which affects the original accuracy of the flexible bearing, resulting in defects such as incomplete assembly, low assembly efficiency, and poor assembly stability. Summary of the Invention

[0007] The purpose of this invention is to provide a simple and easy-to-operate non-destructive assembly structure for harmonic reducer wave generators, which can avoid damage to the inner surface of flexible bearings, solve problems such as incomplete assembly, low assembly efficiency, and poor assembly stability, and reduce assembly errors and improve assembly accuracy.

[0008] The technical solution adopted by the present invention to achieve the above objectives is as follows:

[0009] A non-destructive assembly structure for a harmonic reducer wave generator, wherein the wave generator includes a cam and a flexible bearing; the non-destructive assembly structure is used to assemble the flexible bearing to the outside of the cam, comprising:

[0010] The positioning base has a through hole inside and a first step at one end, which cooperates with the flexible bearing.

[0011] The multi-section solid includes a first end and a second end arranged opposite to each other. The outer edge of the first end is consistent with the outer edge shape of the cam, and the second end is a circular structure with a diameter smaller than the inner diameter of the flexible bearing. The first end is used to cooperate with the cam, and the second end is used to be fitted inside the flexible bearing.

[0012] The pressure mechanism includes positioning holes and a pressing component arranged vertically. The positioning base cooperates with the positioning holes. The end of the positioning base away from the first step can be embedded in the interior of the positioning hole. The first step is arranged opposite to the pressing component. The pressing component moves up and down to press down on the multi-section entity.

[0013] The first step portion includes a first support surface for fitting with the outer ring end face of the flexible bearing, and a second support surface for fitting with the inner ring end face of the flexible bearing. The first support surface is located outside the second support surface and is lower than the second support surface.

[0014] Furthermore, the inner wall of the positioning base includes a gap circular surface, which is connected to the edge of the first support surface away from the second end face. When the flexible bearing is engaged with the first step portion of the positioning base, the outer wall of the outer ring of the flexible bearing is opposite to the gap circular surface, and there is a gap between them.

[0015] Furthermore, there is a smooth transition between the first and second ends of the multi-section solid.

[0016] By adopting the above technical solution, the setting of the first step section forms an annular positioning groove on the end face of the cylindrical positioning base, which is used to cooperate with the flexible bearing.

[0017] During the assembly of the wave generator, the flexible bearing needs to be placed into the positioning groove formed by the first step on the end face of the positioning base. The multi-section solid is then fitted with the cam to form a mating body between the cam and the multi-section solid. That is, the first end of the multi-section solid is aligned with the cam, and the second end of the multi-section solid is passed through the inside of the flexible bearing and inserted into the through hole of the positioning base. Then, the downstream component in the pressure mechanism is used to press down the mating body formed by the cam and the multi-section solid. The multi-section solid moves down until the first end of the multi-section solid abuts against the limiting end face in the positioning base, thereby realizing the assembly of the cam and the flexible bearing.

[0018] During the assembly process described above, the flexible bearing is affected by the external contour of the multi-section entity as it is pressed down. Its shape gradually changes from a circle to an ellipse consistent with the cam. When the multi-section entity is released from the constraint of the inner ring of the flexible bearing due to the downward pressure, the shape of the flexible bearing is consistent with the cam. This ensures that the cam can be smoothly fitted into the interior of the flexible gear, and the two fit tightly together, thus improving the assembly stability.

[0019] Furthermore, the diameter of the circular structure at the second end of the multi-section solid is approximately smaller than the inner diameter of the flexible bearing, facilitating uninterrupted insertion into the flexible bearing and achieving alignment without additional correction, thus improving assembly efficiency. Both the first and second ends of the multi-section solid extend a certain distance along the axis, ensuring a tight fit between the inner surface of the flexible bearing and the shape of the specially curved cam. The portion between the circular structure and the specially curved structure forms a multi-section, smooth transition structure, allowing the flexible bearing to automatically align itself along the smooth transition curve during assembly and undergo gradual, slow deformation under stress, preventing damage from sudden external forces.

[0020] By using a multi-section solid guide, eccentricity between the cam and the flexible bearing can be prevented, thereby improving their coaxiality and ensuring assembly accuracy. The multi-section solid gradually transforms from a circular structure to a special curved structure of the cam from the first end to the second end, so that the deformation of the flexible bearing is also gradually realized. During the deformation process, the flexible bearing fits into the multi-section solid, and the force is uniform, which can avoid the generation of squeezing scratches and friction damage, and will not affect the assembly accuracy of the flexible bearing and the wave generator.

[0021] Furthermore, the inner wall of the positioning base is provided with a second step portion, which is located in the middle of the through hole of the positioning base. The second step portion includes a press-fit limiting end face, which is arranged in the direction of the first step portion and is used to cooperate with the end face of the second end of the multi-section solid.

[0022] In this way, the second step can limit the pressing distance of the multi-section entity. The height of the pressing limit end face can be set according to the size of the multi-section entity. When the end face of the second end of the multi-section entity is in contact with it, the pressing mechanism is blocked, which means that the flexible bearing and the cam are pressed into place. In this way, structural damage caused by excessive pressure can be avoided, and the assembly accuracy of the wave generator can be guaranteed.

[0023] In some embodiments, the outer edge of the first end port of the multi-section entity is provided with a bevel. This facilitates the assembly of the multi-section entity to the limiting size and also allows for easy disassembly.

[0024] According to one embodiment of the present invention, a camshaft is fitted inside the cam, and the camshaft is hollow inside. Correspondingly, a multi-section solid has a through hole inside, allowing the camshaft to be fitted inside the multi-section solid, with the first end of the multi-section solid abutting against the cam. Thus, during the engagement of the multi-section solid and the cam, the camshaft can be used to improve coaxiality and prevent misalignment.

[0025] According to one embodiment of the present invention, a non-destructive assembly structure for a harmonic reducer wave generator includes a flush tooling, which is configured with a press-fit cavity with one open end; a limiting ring is configured at the open end of the press-fit cavity, the end of the camshaft can be fitted inside the press-fit cavity, and the end face of the limiting ring can abut against the end face of the cam; and the length of the inner diameter of the limiting ring is less than the length of the short shaft of the cam, and the length of the outer diameter of the limiting ring is greater than the length of the long shaft of the cam.

[0026] After assembling the cam and camshaft mating body with the flexible bearing according to the above method, in most cases, there is still a height difference between the end face of the flexible bearing inner ring and the end face of the cam. That is, further adjustment is required so that the end face of the flexible bearing inner ring and the end face of the cam fit together. The flushing fixture can help achieve this assembly effect.

[0027] Specifically, the camshaft and flexible bearing assembly, formed by multi-section solid assembly, is placed into a hollow positioning base, with one end of the flexible bearing engaging with the first step of the positioning base. Then, a flush fitting is fitted onto the side of the camshaft and camshaft assembly furthest from the positioning base, aligning the end face of the flexible bearing and the cam with the end face of the limiting ring. A pressing component then applies pressure to the end of the flush fitting furthest from the limiting ring, causing relative movement between the cam and flexible bearing as it moves downwards, until the end face of the limiting ring simultaneously abuts against both the inner ring and cam end faces, i.e., the inner ring of the flexible bearing and the cam end face are flush and fitted together, completing the assembly.

[0028] According to one embodiment of the present invention, the positioning base is provided with a heating component, which is located outside the first step portion.

[0029] The heating assembly includes an annular heating base, which is coaxially fitted with the first step and spaced apart from each other. The heating base has a hollow heating cavity inside, and a heating plate is arranged inside the heating cavity. The heating cavity is equipped with an air inlet and an air outlet. The air inlet is located at the bottom of the outer wall of the heating base, and the air outlet is located at the top of the inner wall of the heating base or on the inner side of the top surface of the heating base.

[0030] Furthermore, a filter element is installed inside the heating chamber.

[0031] Furthermore, the heating substrate comprises multiple arc-shaped heating elements, with adjacent heating elements hinged together.

[0032] Therefore, before assembling the flexible bearing with the multi-section solid and the cam, the top of the positioning base can be heated using a heating element. This raises the temperature of the gas surrounding the flexible bearing, causing its inner diameter to expand to a certain extent. This facilitates the fit between the flexible bearing and the multi-section solid and the cam. After assembly begins or is completed, heating is stopped, allowing the flexible bearing to cool and its diameter to shrink, which helps improve the tightness of the flexible bearing and cam assembly structure.

[0033] Raising the ambient temperature of the flexural bearing by heating the substrate helps improve its elasticity, reduce the coefficient of friction, and prevent significant deformation or damage. This improves assembly efficiency, ensures optimal assembly results, further avoids damage to the inner ring of the flexural bearing, and guarantees assembly precision.

[0034] Furthermore, the combination of the heating substrate and the heating cavity can promote the flow of gas around the flexible bearing, thereby using hot airflow to purge the flexible bearing. On the one hand, this can improve the uniformity of heating of the flexible bearing, avoid local heating, and improve the heating effect; on the other hand, the flowing airflow can remove impurities near the flexible bearing, improve the cleanliness of the assembly space, further avoid scratches on the surface of the flexible bearing, and improve assembly accuracy.

[0035] According to one embodiment of the present invention, a detachable flow guide body is disposed above the heating base, the flow guide body having an inverted funnel-shaped structure; the flow guide body has a flow guide cavity inside, the bottom of the flow guide cavity is connected to the air outlet of the heating cavity, and the top of the flow guide cavity has an exhaust port; the inner sidewall of the flow guide body is provided with flow guide holes.

[0036] The top of the flow guide substrate is equipped with an exhaust port, and the inner sidewall of the flow guide substrate is equipped with a flow guide hole. Both the exhaust port and the flow guide hole are connected to the flow guide cavity.

[0037] Furthermore, the inside of the flow guide cavity is equipped with a filter screen.

[0038] Furthermore, a flow guide tube is fitted inside the flow guide base, the top of the flow guide tube is connected to the inner wall of the flow guide base, and the cavity inside the flow guide tube is connected to the flow guide cavity; when the flow guide base is assembled with the heating base and the heating base is assembled on the top of the positioning base, the flow guide tube can extend into the through hole of the positioning base.

[0039] Furthermore, an exhaust port is provided on the side wall of the guide tube.

[0040] The flow guide substrate is umbrella-shaped and detachably mounted above the flexible bearing. During operation of the heating assembly, the flow guide substrate is positioned above the heating substrate, and the hot airflow inside the heating cavity is guided upwards and gradually concentrated, creating a high-temperature zone on the side and above the flexible bearing. This improves heating efficiency, prevents heat loss, saves energy, and enhances the flexible bearing's thermal deformation performance. Furthermore, the umbrella-shaped flow guide substrate promotes the formation of a swirling flow of hot air, improving heat exchange efficiency and ensuring uniform heating of the flexible bearing. In addition, the hot airflow exits through the flow guide holes on the flow guide substrate, forming a swirling flow that improves the purging effect around the flexible bearing, ensuring even heating and removing impurities.

[0041] In addition, the presence of a filter element inside the heating chamber and a filter screen inside the flow guiding chamber can improve the cleanliness of the airflow and rectify the airflow, thereby improving the airflow balance.

[0042] The design of the guide tube allows the hot airflow inside the guide cavity to be transferred to the through hole of the positioning base, so that both the upper and lower parts of the flexible bearing can be heated. In this way, when the inner diameter of the flexible bearing expands slightly due to heat, the deformation of the upper and lower parts is balanced, which can ensure the consistent elasticity of all parts of the flexible bearing.

[0043] Compared with the prior art, the present invention has the following beneficial effects:

[0044] 1. During the assembly of the flexible bearing and the cam, a multi-section solid is used as the main body to guide the deformation of the flexible bearing. This can avoid damage to the inner surface of the flexible bearing, prevent extrusion scratches, and achieve damage-free assembly of the cam and the flexible bearing. This improves the problem of improper assembly and enhances assembly stability.

[0045] 2. During assembly, the flexible bearing deforms slowly and is subjected to uniform force, which does not affect the accuracy of the flexible bearing; and by using a multi-section solid, the flexible bearing can be automatically aligned during the press-fitting process without special calibration, thereby improving assembly efficiency, reducing assembly errors, and improving assembly accuracy.

[0046] 3. The heating component helps to improve the tightness of the flexible bearing and cam assembly structure, and can also improve the elasticity of the flexible bearing, reduce the coefficient of friction, improve assembly efficiency, and ensure assembly effect; in addition, it can remove impurities near the flexible bearing and improve the cleanliness of the assembly space. Attached Figure Description

[0047] Figure 1 This is a schematic diagram of the non-destructive assembly structure for a harmonic reducer wave generator according to Embodiment 1 of the present invention in its usage state;

[0048] Figure 2 for Figure 1 The diagram shows a partial disassembly of the non-destructive assembly structure for the harmonic reducer wave generator.

[0049] Figure 3 for Figure 2 The diagram shows the structure of the positioning base.

[0050] Figure 4 for Figure 3 A schematic diagram of the cross-sectional structure of the positioning base shown;

[0051] Figure 5 for Figure 4 A partially enlarged structural diagram of section A in the middle;

[0052] Figure 6 for Figure 2 The diagram shows the structure of the multi-section solid.

[0053] Figure 7 for Figure 2 A schematic diagram of the fit between the cam and the camshaft shown.

[0054] Figure 8 for Figure 2 A schematic diagram of the assembly structure of the multi-section solid and the cam shown.

[0055] Figure 9 This is a schematic diagram of the assembly structure of the flexible bearing and the cam.

[0056] Figure 10 for Figure 9 A magnified view of part B in the middle section;

[0057] Figure 11 for Figure 2 The schematic diagram of the flush tooling shown is shown.

[0058] Figure 12 This is a schematic diagram of the assembly structure of the positioning base and the heating component in the non-destructive assembly structure for a harmonic reducer wave generator according to Embodiment 2 of the present invention.

[0059] Figure 13 for Figure 12 A magnified schematic diagram of a portion of the central C section;

[0060] Figure 14 This is a schematic diagram of the assembly structure of the heating substrate and the heat-conducting substrate according to Embodiment 2 of the present invention;

[0061] Figure 15 This is a cross-sectional structural diagram of the purging base according to Embodiment 3 of the present invention.

[0062] Reference numerals: Flexible bearing 10; Cam 20; Camshaft 21; Connecting ring 22; Positioning base 30; First step 31; First support surface 32; Second support surface 33; Gap circular surface 34; Second step 35; Press-fit limiting end face 36; Multi-section solid 40; First end 41; Second end 42; Transition structure 43; Inclined surface 44; Pressure mechanism 50; Positioning hole 51; Press-down assembly 52; Flat tooling 60; Press-fit cavity 61; Limiting ring 62; Heating base 71; Heating cavity 72; Heating plate 73; Guide base 74; Guide cavity 75; Guide hole 76; Guide pipe 77; Purge base 80; Inner tube 81; Outer tube 82; First exhaust gap 83; Second exhaust gap 84. Detailed Implementation

[0063] The technical solution of the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are only for explaining the present invention and are not intended to limit the present invention.

[0064] Example 1

[0065] Figures 1-11 The diagram schematically illustrates a non-destructive assembly structure for a harmonic reducer wave generator according to an embodiment of the present invention. The wave generator includes a flexible bearing 10 and a cam 20; the shape of the flexible bearing 10 can be modified to a certain extent, and the cam 20 has an elliptical outer curve; when assembling the wave generator, the rigid cam 20 with a special curve needs to be pressed into the inner ring surface of the flexible bearing 10, that is, the outer ring of the cam 20 with the special curve is tightly fitted with the originally circular inner ring of the flexible bearing 10. As shown, this non-destructive assembly structure for a harmonic reducer wave generator includes a positioning base 30, a multi-section solid 40, and a pressure mechanism 50.

[0066] The positioning base 30 is a cylindrical structure with a through hole inside. One end of the positioning base 30 has a first step 31, which forms an annular positioning groove on the end face of the cylindrical positioning base 30 for mating with the flexible bearing 10. The first step 31 includes a first support surface 32 for contacting the outer ring end face of the flexible bearing 10, and a second support surface 33 for contacting the inner ring end face of the flexible bearing 10. The first support surface 32 is located outside the second support surface 33 and is lower than the second support surface 33. The inner wall of the positioning base 30 includes a gap circular surface 34, which is connected to the edge of the first support surface 32 away from the second end face 42. When the flexible bearing 10 mates with the first step 31 of the positioning base 30, the outer wall of the outer ring of the flexible bearing 10 faces the gap circular surface 34, with a gap between them. Thus, the first support surface 32 is the bottom plane of the positioning groove, the second support surface 33 is the outer edge end face of the positioning groove near the axis, and the gap circular surface 34 is the side wall of the positioning groove away from the axis.

[0067] The multi-section entity 40 includes a first end 41 and a second end 42 arranged opposite to each other. The outer edge of the first end 41 is consistent with the outer edge shape of the cam 20, and the second end 42 is a circular structure with a diameter smaller than the inner diameter of the flexible bearing 10. The first end 41 is used to cooperate with the cam 20, and the second end 42 is used to be fitted inside the flexible bearing 10. The first end 41 and the second end 42 of the multi-section entity 40 both extend a certain distance along the axis, and there is a smooth transition between the first end 41 and the second end 42, forming a multi-section and smooth transition structure 43.

[0068] The pressure mechanism 50 includes a positioning hole 51 and a pressing component 52, which are arranged vertically and vertically. A positioning base 30 cooperates with the positioning hole 51, and the end of the positioning base 30 away from the first step 31 can be inserted into the interior of the positioning hole 51. The first step 31 and the pressing component 52 are arranged opposite to each other. The pressing component 52 moves up and down to press down on the multi-section entity 40. The pressure mechanism 50 can be a conventional hydraulic pressure mechanism 50, a manual pressure mechanism 50, or an automatically controlled pressure mechanism 50, etc.

[0069] Furthermore, a camshaft 21 is fitted inside the cam 20, and the camshaft 21 is hollow inside. Correspondingly, the multi-section solid 40 has a through hole inside, allowing the camshaft 21 to be fitted inside the multi-section solid 40, with the first end 41 of the multi-section solid 40 abutting against the cam 20. The outer wall of the camshaft 21 is equipped with multiple connecting rings 22, which are arranged on both sides of the cam 20, and the outer diameter of the multiple connecting rings 22 gradually decreases in the direction away from the cam 20.

[0070] During the assembly of the wave generator, the flexible bearing 10 needs to be placed into the positioning groove formed by the first step 31 on the end face of the positioning base 30, and the multi-section entity 40 and the cam 20 are fitted together to form a mating body between the cam 20 and the multi-section entity 40. That is, the first end 41 of the multi-section entity 40 is aligned with the cam 20, and the second end 42 of the multi-section entity 40 is passed through the interior of the flexible bearing 10 and inserted into the through hole of the positioning base 30. Then, the downstream component in the pressure mechanism 50 is used to press down the mating body formed by the cam 20 and the multi-section entity 40, and the multi-section entity 40 moves down until the first end 41 of the multi-section entity 40 abuts against the limiting end face in the positioning base 30, thereby realizing the assembly of the cam 20 and the flexible bearing 10.

[0071] During the assembly process described above, as the multi-section entity 40 is pressed down, the shape of the flexible bearing 10 gradually changes from a circle to an ellipse consistent with the cam 20 due to the influence of the outer contour of the multi-section entity 40. When the multi-section entity 40 is released from the constraint of the inner ring of the flexible bearing 10 due to the downward pressure, the shape of the flexible bearing 10 is consistent with the cam 20. This ensures that the cam 20 can be smoothly fitted into the interior of the flexible gear, and the two fit tightly together, thereby improving the assembly stability.

[0072] Furthermore, the diameter of the circular structure at the second end 42 of the multi-section entity 40 is approximately smaller than the inner diameter of the flexible bearing 10, facilitating uninterrupted insertion into the flexible bearing 10 for alignment without additional correction, thus improving assembly efficiency. Both the first end 41 and the second end 42 of the multi-section entity 40 extend a certain distance along the axis, ensuring a tight fit between the inner surface of the flexible bearing 10 and the specially curved shape of the cam 20. A smooth transition structure 43 is provided between the first end 41 and the second end 42 of the multi-section entity 40, allowing the flexible bearing 10 to automatically align itself along the smooth transition curve of the transition structure 43 during assembly, and to undergo gradual and slow deformation under stress, preventing damage from sudden external forces. Thus, the multi-section entity 40 improves the coaxiality of the flexible bearing 10 and the cam 20 during assembly, eliminating the need for additional correction, simplifying the assembly process, and increasing assembly efficiency.

[0073] The use of the multi-section solid 40 as a guide can prevent eccentricity between the cam 20 and the flexible bearing 10, thereby improving their coaxiality and ensuring assembly accuracy. The multi-section solid 40 gradually transforms from a circular structure to the special curved structure of the cam 20 from the first end 41 to the second end 42, so that the deformation of the flexible bearing 10 is also gradually realized. During the deformation process, the flexible bearing 10 is in close contact with the multi-section solid 40, and the force is uniform, which can avoid the generation of extrusion scratches and friction damage, and will not affect the assembly accuracy of the flexible bearing 10 and the wave generator.

[0074] Furthermore, the inner wall of the positioning base 30 is provided with a second step portion 35, which is located at the middle of the through hole of the positioning base 30. The second step portion 35 includes a press-fit limiting end face 36, which is arranged in the direction of the first step portion 31 and is used to cooperate with the end face of the second end 42 of the multi-section solid 40.

[0075] Thus, the second step 35 can limit the downward pressing distance of the multi-section entity 40. The height of the pressing-fit limiting end face 36 can be set according to the size of the multi-section entity 40. Therefore, when the end face of the second end 42 of the multi-section entity 40 is in contact with it, the pressing mechanism is blocked, indicating that the flexible bearing 10 and the cam 20 are pressed into place. In this way, structural damage caused by excessive pressure can be avoided, and the assembly accuracy of the wave generator can be guaranteed.

[0076] Furthermore, the outer edge of the first end 41 port of the multi-section entity 40 is provided with a bevel 44. This facilitates the assembly of the multi-section entity 40 to the limit size and also allows for easy disassembly.

[0077] When assembling the flexible bearing 10 and cam 20 of the wave generator using the non-destructive assembly structure for the harmonic reducer wave generator of this embodiment, damage to the inner surface of the flexible bearing 10 can be avoided by using the multi-section solid 40 as the main body to guide the deformation of the flexible bearing 10, thus preventing extrusion scratches and achieving non-destructive assembly of the cam 20 and the flexible bearing 10. This improves the problem of improper assembly and enhances assembly stability. Furthermore, the flexible bearing 10 deforms slowly and is subjected to uniform force during the process, without affecting the accuracy of the flexible bearing 10. The multi-section solid 40 can automatically align the flexible bearing 10 during the assembly process without special correction, simplifying the assembly process.

[0078] During the assembly process described above, the special curve of one end of the first end 41 of the multi-section body is consistent with the curve of the cam 20, thereby achieving a smooth transition press fitting without generating other tensions, thus avoiding significant deformation or damage to components such as the flexible bearing 10 and the cam 20.

[0079] In addition, the non-destructive assembly structure for the harmonic reducer wave generator also includes a flush tooling 60, which is equipped with a press-fit cavity 61 with one open end. A limiting ring 62 is provided at the open end of the press-fit cavity 61, allowing the end of the camshaft 21 to be fitted inside the press-fit cavity 61, and the end face of the limiting ring 62 to abut against the end face of the cam 20. Furthermore, the inner diameter of the limiting ring 62 is less than the length of the short shaft of the cam 20, and the outer diameter of the limiting ring 62 is greater than the length of the long shaft of the cam 20. Generally, the inner diameter of the press-fit cavity 61 inside the flush tooling 60 is approximately 0.05mm-0.20mm larger than the outer diameter of the middle part of the camshaft 21, facilitating assembly and auxiliary positioning.

[0080] After assembling the mating body formed by the cam 20 and the camshaft 21 with the flexible bearing 10 according to the above method, in most cases, there is still a height difference between the end face of the inner ring of the flexible bearing 10 and the end face of the cam 20. That is, further adjustment is required so that the end face of the inner ring of the flexible bearing 10 is flush with the end face of the cam 20. The flushing fixture 60 can help achieve this assembly effect.

[0081] Specifically, the camshaft 21 and flexible bearing 10, assembled using a multi-section solid 40, are placed into a hollow positioning base 30, with one end of the flexible bearing 10 engaging with the first step 31 of the positioning base 30. Then, a flushing fixture 60 is fitted onto the side of the camshaft 21 assembly away from the positioning base 30, so that the end face of the flexible bearing 10 in the camshaft 20 assembly, as well as the end face of the cam 20, aligns with the end face of the limiting ring 62. Then, the pressing component 52 applies pressure to the end of the flushing fixture 60 away from the limiting ring 62, causing relative movement between the cam 20 and the flexible bearing 10 as it moves downwards, until the end face of the limiting ring 62 simultaneously abuts against both the end face of the flexible bearing 10 and the end face of the cam 20, i.e., the end face of the flexible bearing 10's inner ring is flush with the end face of the cam 20, completing the assembly.

[0082] The flat-fit tool 60 is specially designed for flattening the inner end face of the flexible bearing 10, which can quickly press the flexible bearing 10 into place with high accuracy and low damage rate.

[0083] The assembly of the wave generator using the non-destructive assembly structure for the harmonic reducer wave generator in this embodiment can reduce assembly errors and improve assembly accuracy; it also helps to realize automated production line assembly, meet production needs, and improve efficiency.

[0084] Example 2

[0085] Figures 12-14 The diagram schematically illustrates a non-destructive assembly structure for a harmonic reducer wave generator according to another embodiment of the present invention, which differs from Embodiment 1 in that the positioning base 30 is provided with a heating component, which is located outside the first step portion 31.

[0086] The heating assembly includes an annular heating base 71, which is disposed on the end face of the positioning base 30 near the first step portion 31 and is coaxially sleeved with the first step portion 31. The heating base 71 has a hollow heating cavity 72 inside, and a heating plate 73 is disposed inside the heating cavity 72. The heating plate 73 is annular. The heating cavity 72 is provided with an air inlet and an air outlet. The air inlet is located at the bottom of the outer wall of the heating base 71, and the air outlet is located in the inner area of ​​the top surface of the heating base 71.

[0087] In other embodiments, the heating substrate 71 may be configured as a spliced ​​structure. For example, the heating substrate 71 includes multiple arc-shaped heating elements, with adjacent heating elements hinged together, and multiple instantaneous heating elements connected end to end to form a ring structure.

[0088] Heating plate 73 heats the gas inside heating cavity 72, which helps the gas to be discharged from the outlet of heating base 71. Due to the change in internal air pressure, external gas enters the interior of heating cavity 72 from the inlet of heating base 71, thereby forming an airflow. The airflow blows from the outside to the inside of heating base 71, that is, blows in the direction of placing flexible bearing 10 on positioning base 30.

[0089] Therefore, before the flexible bearing 10 is fitted with the multi-section solid 40 and the cam 20, the top of the positioning base 30 can be heated using the heating base 71. This raises the temperature of the gas surrounding the flexible bearing 10, causing the inner diameter of the flexible bearing 10 to expand to a certain extent. This facilitates the fitting of the flexible bearing 10 with the multi-section solid 40 and the cam 20. After the assembly of the flexible bearing 10 and the cam 20 begins or is completed, heating is stopped. The flexible bearing 10 cools down and its diameter shrinks, which helps to improve the tightness of the assembly structure between the flexible bearing 10 and the cam 20.

[0090] Raising the ambient temperature of the flexible bearing 10 by heating the substrate 71 helps improve its elasticity, reduce the coefficient of friction, and prevent significant deformation or damage. This improves assembly efficiency, ensures optimal assembly results, further avoids damage to the inner ring of the flexible bearing 10, and guarantees assembly accuracy.

[0091] Furthermore, the cooperation between the heating base 71 and the heating cavity 72 can promote the flow of gas around the flexible bearing 10, thereby using hot airflow to purge the flexible bearing 10. On the one hand, this can improve the heat distribution uniformity of the flexible bearing 10, avoid localized heating, and improve the heating effect; on the other hand, the flowing airflow can remove impurities near the flexible bearing 10, improve the cleanliness of the assembly space, further avoid scratches on the surface of the flexible bearing 10, and improve assembly accuracy.

[0092] In addition, a detachable flow guide body 74 is disposed above the heating base 71. The flow guide body 74 has an inverted funnel-shaped structure. The flow guide body 74 has a flow guide cavity 75 inside. The bottom of the flow guide cavity 75 is connected to the air outlet of the heating cavity 72, and the top of the flow guide cavity 75 is provided with an exhaust port. The inner sidewall of the flow guide body 74 is provided with flow guide holes 76.

[0093] The top of the flow guide base 74 is provided with an exhaust port, and the inner side wall of the flow guide base 74 is provided with a flow guide hole 76. Both the exhaust port and the flow guide hole 76 are connected to the flow guide cavity 75.

[0094] A flow guide tube 77 is fitted inside the flow guide base 74. The top of the flow guide tube 77 is connected to the inner sidewall of the flow guide base 74, and the cavity inside the flow guide tube 77 is connected to the flow guide cavity 75. When the flow guide base 74 is assembled with the heating base 71 and the heating base 71 is assembled on top of the positioning base, the flow guide tube 77 can extend into the through hole of the positioning base. An exhaust port is provided on the sidewall of the flow guide tube 77.

[0095] The flow guide base 74 is umbrella-shaped and detachably mounted above the flexible bearing 10. During operation of the heating assembly, the flow guide base 74 is positioned above the heating base 71, and the hot airflow inside the heating cavity 72 is guided upwards and gradually concentrated through the flow guide cavity 75. This creates a high-temperature zone on the side and above the flexible bearing 10, improving heating efficiency, preventing heat loss, saving energy, and enhancing the thermal deformation effect of the flexible bearing 10. Furthermore, the umbrella-shaped flow guide base 74 promotes the formation of a swirling flow of hot air, improving heat exchange efficiency and ensuring uniform heating of the flexible bearing 10. Additionally, the hot airflow exits through the flow guide holes 76 on the flow guide base 74, forming a swirling flow, which improves the purging effect around the flexible bearing 10, ensuring even heating and removing impurities.

[0096] The guide tube 77 can transfer the hot airflow inside the guide cavity 75 to the through hole of the positioning base 30, so that the upper and lower parts of the flexible bearing 10 can be heated. In this way, when the inner diameter of the flexible bearing 10 expands slightly due to heat, the deformation of the upper and lower parts is balanced, which can ensure the consistent elasticity of each part of the flexible bearing 10.

[0097] In addition, a filter element can be installed inside the heating chamber 72, and a filter screen can be installed inside the flow guiding chamber 75 to improve the cleanliness of the airflow and to rectify the airflow and improve the airflow balance.

[0098] Example 3

[0099] Figure 15 The diagram schematically illustrates a non-destructive assembly structure for a harmonic reducer wave generator according to another embodiment of the present invention, which differs from Embodiment 1 in that the pressure mechanism 50 is equipped with a purging assembly located outside the positioning hole 51.

[0100] The purging assembly includes multiple purging bases 80 arranged in a circumferential array around the positioning hole 51. Each purging base 80 includes an inner tube 81 and an outer tube 82, with one end of the inner tube 81 connected to an external inflation structure.

[0101] The inner tube 81 has a number of first exhaust slits 83 on its side wall, and the outer tube 82 has a number of second exhaust slits 84 on its side wall. The number of second exhaust slits 84 are corresponding to the positioning hole 51 and the positioning base 30. The first exhaust slits 83 are located on the side of the inner tube 81 away from the second exhaust slits 84.

[0102] The purging assembly blows external gas toward the positioning hole 51 of the pressure mechanism 50. Thus, during the assembly of the flexible bearing 10 and the cam 20, the purging assembly can blow hot or cold air onto the positioning base 30, the flexible bearing 10, and the multi-section solid 40, thereby raising or lowering the temperature of components such as the flexible bearing 10. Blowing hot air reduces the loss of ambient temperature and avoids stress deformation problems caused by rapid cooling after workpiece assembly, while blowing cold air cools the workpiece.

[0103] The structure of the inner tube 81 and the outer tube 82 can rectify the airflow. In particular, the first exhaust gap 83 and the second exhaust gap 84 are set opposite to each other, so that the airflow forms a vortex between the outer tube 82 and the inner tube 81, thereby improving the airflow balance and making the temperature of the exhaust airflow more uniform, which can improve the stability of temperature changes of components such as the flexible bearing 10.

[0104] Multiple purge bases 80 are arranged in a circumferential array, and the airflow discharged from them can mix, further improving the gas uniformity near the positioning base 30. This ensures stable temperature changes during assembly, even when the ambient temperature is adjusted. The airflow discharged from multiple purge bases 80 interacts with each other, reducing the efficiency of outward air diffusion, thus improving the effect of hot or cold air, increasing the efficiency of heating or cooling processes, and saving energy.

[0105] In addition, the purging component in this embodiment can also be used in conjunction with the heating component in embodiment 2 to prevent a sudden increase in the ambient temperature around the positioning base 30 and to ensure that components such as the flexible bearing 10 are heated evenly.

[0106] The conventional operations in the operation steps of this invention are well known to those skilled in the art and will not be described in detail here.

[0107] The embodiments described above provide a detailed explanation of the technical solution of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, additions, or similar substitutions made within the scope of the principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A non-destructive assembly structure for a harmonic reducer wave generator, the wave generator comprising a cam (20) and a flexible bearing (10); characterized in that, The non-destructive assembly structure includes: The positioning base (30) has a through hole inside, and a first step (31) is provided at one end of the positioning base (30), which cooperates with the flexible bearing (10). A multi-section entity (40) includes a first end (41) and a second end (42) disposed opposite to each other. The outer edge of the first end (41) is consistent with the outer edge shape of the cam (20). The second end (42) is a circular structure, and the diameter of the circular structure is smaller than the inner diameter of the flexible bearing (10). The first end (41) is used to cooperate with the cam (20), and the second end (42) is used to be sleeved inside the flexible bearing (10). The pressure mechanism (50) includes positioning holes (51) and pressing components (52) arranged vertically and vertically. The positioning base (30) cooperates with the positioning holes (51), and the pressing components (52) move up and down to press down on the multi-section solid (40). The pressure mechanism (50) is equipped with a purging assembly, which is located outside the positioning hole (51). The purging assembly includes a purging base (80), which includes an inner tube (81) and an outer tube (82) with inner and outer sleeves. A first exhaust slit (83) is provided on the side wall of the inner tube (81), and a second exhaust slit (84) is provided on the side wall of the outer tube (82). The second exhaust slit (84) is correspondingly provided with the positioning hole (51) and the positioning base (30). The positioning base (30) is equipped with a heating component, which is located outside the first step portion (31); The heating assembly includes an annular heating base (71), the heating base (71) has a hollow heating cavity (72) inside, the heating cavity (72) is equipped with a heating plate (73) inside, and the heating cavity (72) is equipped with an air inlet and an air outlet; A detachable flow guide body (74) is disposed above the heating base (71). The flow guide body (74) has an inverted funnel-shaped structure. A flow guide cavity (75) is provided inside the flow guide body (74). The bottom of the flow guide cavity (75) is connected to the air outlet of the heating cavity (72). An exhaust port is provided at the top of the flow guide cavity (75). A flow guide hole (76) is provided on the inner side wall of the flow guide body (74).

2. The non-destructive assembly structure for a harmonic reducer wave generator according to claim 1, characterized in that, The inner wall of the positioning base (30) is provided with a second step portion (35), the second step portion (35) includes a press-fit limiting end face (36) for cooperating with the end face of the second end (42) of the multi-section solid (40); The first step portion (31) includes a first support surface (32) for fitting with the outer ring end face of the flexible bearing (10), and a second support surface (33) for fitting with the inner ring end face of the flexible bearing (10).

3. The non-destructive assembly structure for a harmonic reducer wave generator according to claim 1, characterized in that, The first end (41) and the second end (42) of the multi-section entity (40) are smoothly transitioned, and the outer edge of the first end (41) port is provided with a bevel (44).

4. The non-destructive assembly structure for a harmonic reducer wave generator according to claim 1, characterized in that, The cam (20) is fitted with a camshaft (21) inside. The camshaft (21) is hollow inside. The camshaft (21) can be fitted inside the multi-section entity (40) and make the first end (41) of the multi-section entity (40) abut against the cam (20).

5. A non-destructive assembly structure for a harmonic reducer wave generator according to claim 4, characterized in that, The non-destructive assembly structure for the harmonic reducer wave generator includes a flush tool (60), which is equipped with a press-fit cavity (61) with one end open. The opening end of the press-fit cavity (61) is provided with a limiting ring (62), and the end of the camshaft (21) can be sleeved inside the press-fit cavity (61), so that the end face of the limiting ring (62) can abut against the end face of the cam (20).

Images