Floating flexible inner gear ring assembly and flexible gear ring planetary gear train

Abstract

The present invention relates to a floating flexible inner gear ring assembly, which is used in a planetary gear transmission system, and includes an inner gear ring and an outer ring. A plurality of groups of spaced connection parts are provided on the outer circumference of the inner gear ring, and a corresponding matching part is provided on the inner circumference of the outer ring. A first floating gap is provided between the two, which allows the inner gear ring to be floated and adjusted in the radial direction, thereby improving the load-sharing performance and reducing vibration. Furthermore, a second floating gap is provided between the inner gear ring and the outer ring, thereby enhancing the flexibility of the inner gear ring and preventing overload damage. The connection part is designed as a block, which cooperates with the slot of the outer ring, and the two sides of the block fit with the two sides of the slot, thereby improving the floating adjustment accuracy. The block can be rectangular or wedge-shaped, made of the same material as the inner gear ring, and one end is integrally formed with the inner gear ring to enhance the structural integrity. The floating flexible inner gear ring assembly of the present invention effectively improves the load-sharing performance and dynamic load performance of the planetary gear transmission system.

Description

Technical Field

[0001] The present invention particularly relates to a floating flexible internal gear ring assembly and a flexible gear ring planetary gear train thereof. Background Art

[0002] As a commonly used power split gear transmission system, the planetary gear transmission system has the advantages of compact structure, light weight and strong load-bearing capacity. Its vibration characteristics and noise will directly affect the performance, working reliability and comfort of the machinery.

[0003] As one of the important components of the planetary gear transmission system, the performance of the inner gear ring will directly affect the load-sharing and dynamic load characteristics of the planetary transmission system. However, the traditional fully fixed inner gear ring has poor structural flexibility and is installed with bolts all around, which makes the load-sharing and dynamic load performance of the planetary transmission system with the traditional fixed gear ring structure poor, resulting in large vibration and noise in the planetary transmission system during the transmission process, and poor stability of the transmission system.

[0004] Based on the current situation, it is necessary to propose an inner gear ring configuration with better performance to further improve the load-sharing performance and dynamic load performance level of the planetary gear system. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a floating flexible internal gear ring assembly and a flexible internal gear ring planetary gear train in view of the above-mentioned deficiencies in the prior art, which can significantly improve the load-sharing performance of the planetary transmission system while enhancing the dynamic load performance of the system.

[0006] To achieve the above object, the present invention provides the following technical solutions: A floating flexible inner gear ring assembly comprises an inner gear ring and an outer ring sleeved on the outer circumference of the inner gear ring, wherein a plurality of groups of spaced-apart connecting portions are arranged on the outer circumference of the inner gear ring facing the inner circumference of the outer ring, and a group of matching portions are respectively arranged on the inner circumference of the outer ring facing the inner gear ring corresponding to each group of connecting portions, and each group of connecting portions is inserted into the matching portions, and is characterized in that a first floating gap exists between the connecting portions and the matching portions.

[0007] By adopting the above technical solution, the inner gear ring is fixed in the circumferential direction by cooperating with the matching parts on the outer ring through multiple axial connecting parts on the outer circle of the inner gear ring. A certain side clearance (i.e., the first floating clearance) is left between the connecting part and the matching part, and radial sliding can be used to restrict the circumferential movement of the inner gear ring while allowing the inner gear ring to deform radially, so as to achieve floating adjustment within a certain range, which helps to more evenly distribute the load between the planetary gears, thereby improving the load-balancing performance of the entire transmission system. Since the inner gear ring can float within a certain range, it can also absorb and reduce the vibration generated during the transmission process, thereby reducing the noise of the system and improving the smoothness of the transmission. By reducing vibration and noise, the reliability of the transmission system is improved, and the running comfort of the machine is also improved.

[0008] The above-mentioned floating flexible inner gear ring assembly may be further configured as follows: a second floating gap exists between the outer circumferential surface of the inner gear ring and the inner circumferential surface of the outer ring.

[0009] With the above technical solution, when meshing occurs, due to the action of tangential force, the connection part will have good contact with the matching part on the outer ring. Due to the gap left between the inner gear ring and the outer ring (i.e., the second floating gap), the inner gear ring can better obtain greater flexibility, and when the designed deformation is exceeded, it will be restricted by the outer ring, which can avoid structural damage during overload. Furthermore, the existence of the second floating gap enables the inner gear ring to better adapt to load changes and optimize load distribution.

[0010] The above-mentioned floating flexible inner gear ring assembly can be further configured as follows: the connecting portion is a clamping block, one end of the clamping block is fixedly connected to the outer circumferential surface of the inner gear ring, and the other end extends toward the inner circumferential surface of the outer gear ring, and the matching portion is a clamping groove, which is distributed on the inner circumferential surface of the outer ring and is recessed toward the side away from the inner gear ring, each group of clamping blocks is matched with each group of clamping grooves, and there is a first floating gap distributed along the radial direction of the outer ring between the end of the clamping block away from the outer gear ring and the inner end of the clamping groove.

[0011] With the above technical solution, the fixed connection between the block and the outer circumference of the inner gear ring ensures the stability of the structure, so that the inner gear ring can maintain the correct position during the transmission process. The other end of the block is designed to extend toward the inner circumference of the outer ring and cooperate with the slot on the outer ring, so that the inner gear ring has the ability to float and adjust in the radial direction to adapt to various working conditions and load changes. The first floating gap allows the inner gear ring to slide limitedly in the radial direction, realizing floating adjustment, thereby improving the flexibility of the planetary system. During the gear meshing process, the close fit between the block and the slot ensures that the contact between the inner gear ring and the planetary gear is more stable and will not be misaligned, which helps to more evenly distribute the load between the planetary gears, thereby improving the load-sharing performance. When the deformation of the inner gear ring exceeds the designed deformation, the fit between the block and the slot will effectively limit the further deformation of the inner gear ring, prevent structural damage under overload conditions, and thus enhance the reliability of the system.

[0012] The above-mentioned floating flexible inner gear ring assembly can be further configured as follows: two sides of the clamping block are respectively fitted with two sides of the clamping slot.

[0013] By adopting the above technical solution, the correct position of the inner gear ring is maintained during the transmission process, the contact area on both sides is larger, and the radial force can be distributed more evenly, thereby improving the accuracy of floating adjustment.

[0014] The above-mentioned floating flexible inner gear ring assembly can be further configured as follows: the block is rectangular or wedge-shaped, the slot is consistent with the shape of the block, and when the block is wedge-shaped, the two sides of the block are symmetrical to each other, and the large end of the block is connected to the inner gear ring.

[0015] With the above technical solution, the cooperation between the rectangular block and the slot can ensure that the contact between the inner gear ring and the planetary gear is more uniform during the meshing process, which helps to optimize the load distribution and reduce the wear caused by uneven contact. The wedge-shaped block has a larger contact area with the slot, which helps to enhance the contact stability between the inner gear ring and the outer ring, thereby maintaining the correct position of the inner gear ring during the transmission process.

[0016] The above-mentioned floating flexible inner gear ring component can be further configured as follows: the clamping block and the inner gear ring are made of the same material.

[0017] The above technical solution can ensure the high consistency of the physical and mechanical properties (such as thermal expansion coefficient, strength and wear resistance) of the block and the inner gear ring, which not only reduces the internal stress and potential failure risk caused by material differences, but also improves the overall performance of the planetary gear system. In addition, the selection of the same material enables the block and the inner gear ring to use the same heat treatment and surface treatment process, which is convenient for processing.

[0018] The above-mentioned floating flexible inner gear ring assembly can be further configured as follows: one end of the clamping block is integrally formed with the inner gear ring.

[0019] By adopting the above technical solution, the overall integrity of the inner gear ring is enhanced, thereby reducing potential weaknesses.

[0020] The above-mentioned floating flexible internal gear ring assembly can be further configured as: there are at least 2 groups of connecting parts.

[0021] A flexible ring gear planetary gear train comprises an inner ring gear assembly and a sun gear distributed in the middle of the ring gear, at least one set of planetary gears is distributed between the sun gear and the inner ring gear assembly, and is characterized in that the inner ring gear assembly adopts the inner ring gear assembly of any one of claims 1 to 8.

[0022] The above-mentioned flexible ring gear planetary gear train can be further configured as follows: the number of the planetary gears is between 1 and 5.

[0023] The flexible gear ring planetary gear train, with the help of the flexibility and floating property of the thin-walled inner gear ring itself, can compensate for the uneven torque transmission of each branch of the system caused by the processing errors and installation errors of the system components, thereby improving the load-sharing performance of the system. On the other hand, the floating flexible inner gear ring assembly proposed in the present invention has a small fluctuation amplitude of the transmission error, and the tooth surface contact stress is evenly distributed. There is no tooth surface unbalanced load and stress concentration area, which helps to improve the contact performance of the gear tooth surface. Therefore, the floating flexible inner gear ring proposed in the present invention can solve the poor performance of the traditional fixed gear ring in the load-sharing and dynamic load performance of the planetary transmission system, better improve the load-sharing and dynamic load performance of the planetary gear train, and compensate for the impact of installation and manufacturing errors, etc., and has good practical application value.

[0024] The present invention is further described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention; Figure 2 It is a top view schematic diagram of the first embodiment of the present invention; Figure 3 for Figure 2 A partial enlarged schematic diagram in the middle; Figure 4 It is a top view schematic diagram of the second embodiment of the present invention; Figure 5 (a) is the experimental data diagram of the inner gear bearing transmission error of the floating flexible inner gear assembly; Figure 5 (b) is the experimental data diagram of the internal gear ring load transmission error of the fully fixed internal gear ring; Figure 6 (a) is the experimental data diagram of contact stress at each position of the inner gear ring meshing cycle of the floating flexible inner gear ring assembly; Figure 6(b) is the experimental data diagram of contact stress at each position of the internal gear ring meshing cycle of the fully fixed internal gear ring; Figure 7 This is a schematic diagram of experimental data of the contact stress distribution on the tooth surface along the tooth width direction of the original "single tooth meshing area" of the floating flexible internal gear ring; Figure 8 This is the stress cloud diagram of the floating flexible inner gear ring assembly; Fig. 9 (a) is the experimental data diagram of the average load factor (sun gear and planet gear) of each branch of the system when the floating flexible internal gear ring assembly is applied; Fig. 9 (b) is the experimental data diagram of the average load factor (sun gear and planet gear) of each branch of the system when a fully fixed internal gear ring is used; Fig.10 (a) is the experimental data diagram of the average load factor (internal gear and planetary gear) of each branch of the system when the floating flexible internal gear assembly is used; Fig.10 (b) is the experimental data diagram of the average load factor of each branch of the system (internal gear and planetary gear) when a fully fixed internal gear ring is used; Fig.11 (a) is the dynamic load coefficient of each branch of the system (sun gear and planet gear) when the floating flexible internal gear ring assembly is used; Fig.11 (b) is the dynamic load coefficient of each branch of the system (sun gear and planet gear) when a fully fixed internal gear ring is used; Fig.12 (a) is the dynamic load coefficient of each branch of the system (internal gear and planetary gear) when the floating flexible internal gear assembly is applied; Fig.12 (b) is the dynamic load coefficient of each branch of the system when a fully fixed internal gear ring is used (internal gear ring and planetary gear); Reference numerals: inner gear ring 1, outer ring 2, clamping block 3, clamping groove 4, first floating gap 5, second floating gap 6, sun gear 7, planetary gear 8. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] Embodiment 1: Figures 1 to 3The floating flexible inner gear ring assembly shown comprises an inner gear ring 1 and an outer ring 2 sleeved on the outer circumference of the inner gear ring 1. A plurality of groups of spaced blocks 3 are arranged on the outer circumference of the inner gear ring 1 facing the inner circumference of the outer ring 2. A group of slots 4 are arranged on the inner circumference of the outer ring 2 facing the inner gear ring 1 corresponding to each group of the blocks 3. One end of the block 3 is fixedly connected to the outer circumference of the inner gear ring 1 and the other end extends toward the inner circumference of the outer gear ring. The slots 4 are distributed on the inner circumference of the outer ring 2 and are recessed toward the side away from the inner gear ring 1. Each group of blocks 3 cooperates with each group of slots 4, and there is a first floating gap 5 distributed along the radial direction of the outer ring 2 between the end of the block 3 away from the outer gear ring and the inner end of the slot 4. The inner gear ring 1 is fixed in the circumferential direction by the cooperation of the plurality of axial blocks 3 on the outer circumference of the inner gear ring 1 and the slots 4 on the outer ring 2. The block 3 and the slot 4 have a certain side clearance (i.e., the first floating clearance 5), which can allow the inner gear ring 1 to deform radially while restricting the circumferential movement of the inner gear ring 1 through radial sliding, and can achieve floating adjustment within a certain range, which helps to more evenly distribute the load between the planetary gears, thereby improving the load-balancing performance of the entire transmission system. Since the inner gear ring 1 can float within a certain range, it can also absorb and reduce the vibration generated during the transmission process, thereby reducing the noise of the system and improving the stability of the transmission. By reducing vibration and noise, the reliability of the transmission system is improved, and the running comfort of the machine is also improved.

[0028] There is a second floating gap 6 between the outer circumference of the inner gear ring 1 and the inner circumference of the outer ring 2. When meshing occurs, due to the effect of the tangential force, the block 3 will have good contact with the slot 4 on the outer ring 2. Due to the gap left between the inner gear ring 1 and the outer ring 2 (i.e., the second floating gap 6), the inner gear ring 1 can better obtain greater flexibility, and when the designed deformation is exceeded, it will be restricted by the outer ring 2, which can avoid structural damage during overload. Furthermore, the existence of the second floating gap 6 enables the inner gear ring 1 to better adapt to load changes and optimize load distribution.

[0029] The two sides of the clamping block 3 are respectively fitted with the two sides of the clamping groove 4. The correct position of the inner gear ring 1 is maintained during the transmission process, and the contact area on both sides is larger, which can distribute the radial force more evenly, thereby improving the accuracy of the floating adjustment.

[0030] The block 3 is rectangular or wedge-shaped, and the slot 4 is consistent with the shape of the block 3. When the block 3 is wedge-shaped, the two sides of the block 3 are symmetrical to each other, and the large end of the block 3 is connected to the inner gear ring 1. The cooperation between the rectangular block 3 and the slot 4 can ensure that the contact between the inner gear ring 1 and the planetary gear is more uniform during the meshing process, which helps to optimize the load distribution and reduce the wear caused by uneven contact. The contact area between the wedge-shaped block 3 and the slot 4 is large, which helps to enhance the contact stability between the inner gear ring 1 and the outer ring 2, thereby maintaining the correct position of the inner gear ring 1 during the transmission process.

[0031] One end of the block 3 is integrally formed with the inner gear ring 1, and the two are made of the same material. This ensures that the block 3 and the inner gear ring 1 have high consistency in physical and mechanical properties (such as thermal expansion coefficient, strength and wear resistance), which not only reduces the internal stress and potential failure risks caused by material differences, but also improves the overall performance of the planetary gear system. In addition, the selection of the same material allows the block 3 and the inner gear ring 1 to use the same heat treatment and surface treatment processes, which is convenient for processing.

[0032] Embodiment 2: Figure 2 The flexible ring gear planetary gear train shown includes an inner ring gear assembly, a sun gear 7 distributed in the middle of the ring gear, and five sets of planetary gears 8 distributed between the sun gear 7 and the inner ring gear assembly. The inner ring gear assembly adopts the inner ring gear assembly in the first embodiment.

[0033] The following are experimental data obtained by substituting specific parameters in Examples 1 and 2 and verifying using the “Finite Element Parametric Modeling Solution Method”: (I) The specific structural parameters of the inner gear ring 1 are as follows: tooth width 88mm, gap 5mm, outer diameter 637mm, 310 blocks, rim thickness 12mm, outer ring 2 thickness 30mm, and the inner gear ring assembly is fixed by the outer ring 2.

[0034] (ii) In order to accurately obtain the meshing characteristics of the floating flexible internal gear ring assembly, the finite element parametric modeling solution method was used to analyze and obtain the "load transmission error", "maximum contact stress on the tooth surface" and "distribution of tooth surface contact stress in the original single tooth meshing area" along the tooth width direction of the floating flexible internal gear ring assembly (due to the large structural flexibility of the floating flexible internal gear ring assembly, the overlap between the gear teeth changes, and the original single tooth meshing area is transformed into a double tooth meshing area), and the corresponding change curves were drawn.

[0035] In order to intuitively compare the changing curves of the floating flexible internal gear ring assembly and the traditional fully fixed internal gear ring, the finite element parametric modeling solution method was used to analyze and obtain the load transmission error and the maximum contact stress of the tooth surface of the fully fixed internal gear ring under the same environmental conditions, and the corresponding changing curves were drawn.

[0036] contrast Figure 5 From "(a) and (b)", it can be seen that the floating flexible internal gear ring assembly has better structural flexibility than the traditional fully fixed internal gear ring, which will further improve the load-balancing performance of the system. In addition, the fluctuation amplitude of the transmission error of the floating flexible internal gear ring assembly is also significantly reduced, which will help reduce the vibration and noise of the system during transmission.

[0037] Depend on Figure 6From "(a) and (b)", we can see that the contact stress curve of the floating flexible internal gear ring assembly shows that the maximum value appears at meshing position 4, which is the same as the position of the fully fixed internal gear ring. This meshing position is located in the single-tooth meshing area of ​​the gear pair theory. Figure 6 (a) and (b) show that the maximum contact stress of the floating flexible internal gear ring assembly is similar to the maximum contact stress of the fully fixed internal gear ring, but the fluctuation amplitude of the contact stress is significantly lower than that of the fully fixed internal gear ring.

[0038] Depend on Figure 7 It can be seen that the contact stress of the floating flexible internal gear ring assembly along the tooth width direction is evenly distributed, and there is no stress unbalance at both ends, which will help improve the contact performance of the gear tooth surface.

[0039] Depend on Figure 8 It can be seen that there is no stress concentration area in this structure, which further demonstrates the superiority of this structure.

[0040] The lumped mass method is used to accurately construct the system dynamics model under the same parameters. After simulation analysis, the average load coefficient and dynamic load coefficient of each internal and external meshing pair of the two internal gear ring structures under the same error setting are obtained.

[0041] Fig. 9 In “(a)” and “(b)”, “JZXS” represents the instantaneous load sharing factor of each branch of the system. The first digit 1 represents the sun gear 7, and the second digit represents the i-th planetary gear 8, thereby representing different meshing pairs.

[0042] Fig.10 In “(a)” and “(b)”, “JZXS” represents the instantaneous load-sharing factor of each branch of the system. The first digit 2 represents the inner ring gear 1, and the second digit represents the i-th planetary gear 8, thereby representing different meshing pairs.

[0043] pass Fig. 9 as well as Fig.10 By comparison, it can be seen that the structural flexibility of the fully fixed internal gear ring is poor, the system load-sharing coefficient is large, and the load-sharing coefficient curves of each internal meshing pair are not smoothly transitioned. This is due to the sudden jump of the load during the transmission process, which will seriously affect the stability of the system transmission process and increase the vibration and noise of the system. When the floating flexible internal gear ring assembly is adopted, the system load-sharing coefficient is significantly reduced. Compared with the fully fixed internal gear ring, the system load-sharing coefficient is reduced by 31.03%, indicating that the use of the floating flexible internal gear ring assembly can significantly improve the load-sharing performance of the planetary transmission system, and it is very good to avoid the problem of non-smooth transition of the load-sharing coefficient of the internal meshing gear pair when the fully fixed internal gear ring is adopted, making the system transmission more stable.

[0044] Fig.11In “(a)” and “(b)”, “DZXS” represents the instantaneous dynamic load coefficient of each branch of the system, the first digit 1 represents the sun gear 7, and the second digit represents the i-th planetary gear 8, thereby representing different meshing pairs.

[0045] Fig.12 In “(a) and (b)”, DZXS represents the instantaneous dynamic load coefficient of each branch of the system, the first number 2 represents the inner ring gear 1, and the second number represents the i-th planetary gear 8, which represents different meshing pairs.

[0046] pass Fig.11 as well as Fig.12 By comparing the results, it can be seen that the dynamic load coefficient of the planetary transmission system is larger when a fully fixed internal gear ring is used, and the dynamic load curves of each branch fluctuate violently, which will lead to increased vibration and noise of the planetary transmission system during the transmission process; when a floating flexible internal gear ring assembly is used, the dynamic load coefficients of the internal and external meshing gear pairs are significantly lower than those when a fully fixed internal gear ring is used. It can be seen that the floating flexible internal gear ring assembly of the present invention has the characteristics of significantly improving the average load coefficient of the planetary transmission system while ensuring that the system dynamic load coefficient is also improved.

[0047] By combining the accompanying drawings and the embodiments, it can be seen that the floating flexible inner gear ring assembly not only improves the structural flexibility and improves the system load-sharing performance, but also overcomes the problems of tooth surface eccentric loading, stress concentration and large fluctuation amplitude of load-bearing transmission error, and significantly improves the transmission system load-sharing coefficient while ensuring that the system dynamic load coefficient is also improved. However, the present application is not limited to the above-mentioned implementation methods, and the above-mentioned specific implementation methods are only illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present application and the claims, all of which are within the protection of the present application.

Claims

1. A floating flexible inner gear ring assembly, comprising an inner gear ring and an outer ring sleeved on the outer circumference of the inner gear ring, wherein the outer circumference of the inner gear ring facing the inner circumference of the outer ring is provided with a plurality of groups of spaced connection parts, and the inner circumference of the outer ring facing the inner gear ring is provided with a group of matching parts corresponding to each group of connection parts, and each group of connection parts is inserted into the matching part, characterized in that: A first floating gap exists between the connecting portion and the matching portion.

2. The floating flexible internal gear ring assembly according to claim 1, characterized in that: A second floating gap exists between the outer circumferential surface of the inner gear ring and the inner circumferential surface of the outer ring.

3. The floating flexible internal gear ring assembly according to claim 2, characterized in that: The connecting portion is a block, one end of which is fixedly connected to the outer circumferential surface of the inner gear ring and the other end extends toward the inner circumferential surface of the outer gear ring. The matching portion is a slot, which is distributed on the inner circumferential surface of the outer ring and is recessed toward the side away from the inner gear ring. Each group of blocks is matched with each group of slots, and a first floating gap distributed along the radial direction of the outer ring exists between the end of the block away from the outer gear ring and the inner end of the slot.

4. The floating flexible internal gear ring assembly according to claim 3, characterized in that: The two sides of the card block are respectively fitted with the two sides of the card slot.

5. The floating flexible internal gear ring assembly according to claim 4, characterized in that: The block is rectangular or wedge-shaped, and the slot is consistent with the shape of the block. When the block is wedge-shaped, the two side surfaces of the block are symmetrical to each other, and the large end of the block is connected to the inner gear ring.

6. The floating flexible internal gear ring assembly according to claim 2, characterized in that: The clamping block and the inner gear ring are made of the same material.

7. The floating flexible internal gear ring assembly according to claim 6, characterized in that: One end of the clamping block is integrally formed with the inner gear ring.

8. The floating flexible internal gear ring assembly according to claim 2, characterized in that: There are at least two groups of connecting parts.

9. A flexible ring gear planetary gear train, comprising an inner ring gear assembly, a sun gear distributed in the middle of the ring gear, and at least one set of planetary gears distributed between the sun gear and the inner ring gear assembly, characterized in that: The inner ring gear assembly adopts the inner ring gear assembly according to any one of claims 1 to 8.

10. The flexible ring gear planetary gear train according to claim 9, characterized in that: The number of the planetary gears is between 1 and 5.

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