L-shaped flexible inner gear ring structure in planetary transmission system

Abstract

The invention discloses an L-shaped flexible inner gear ring structure in a planetary transmission system, and relates to the technical field of planetary gear transmission systems. The extension flexible ring is formed by extending the lower end face of the inner gear ring body in the vertical direction, the extension flexible ring has the adjustable vertical length and the adjustable radial thickness, and the overall flexibility of the gear ring structure is adjusted by changing the length and the thickness of the extension flexible ring. According to the L-shaped flexible inner gear ring structure in the planetary transmission system, due to the fact that the extension structure is designed on the lower end face of the inner gear ring body, the overall flexibility of the gear ring structure can be improved by changing the extension length and thickness, and the flexibility of the structure is greatly improved; the non-uniformity, caused by machining errors and installation errors of system components, of transmission torque of all branches of the system can be compensated, and the uniform load performance of the planetary transmission system can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of planetary gear transmission system, and particularly relates to an L-shaped flexible inner ring gear structure in a planetary transmission system. BACKGROUND

[0002] As a core component of the transmission system, the main reducer of a helicopter needs to realize high power density power transmission under extreme working conditions, and its performance is directly related to the reliability and safety of the whole machine. At present, the planetary gear transmission of non-fixed shaft gear train is widely used in the main reducer of a helicopter, and multiple planetary gears are used to share the load. Compared with ordinary gear transmission, it has the characteristics of small size, light weight, compact structure, high transmission power and large carrying capacity. However, due to the influence of component deformation and other factors, the load distribution of each branch of the planetary transmission system of the main reducer becomes uneven and the vibration is enhanced, thereby affecting the overall performance of the helicopter.

[0003] The traditional full-fixed inner ring gear has poor structural flexibility. When the full-fixed inner ring gear is used, the load sharing coefficient and dynamic load coefficient of the planetary transmission system are large, and the load distribution of each branch is uneven, which will lead to the reduction of the smoothness of the planetary transmission system.

[0004] Both theoretical analysis and experimental research show that the flexibility of the inner ring gear has a significant influence on the dynamic characteristics of the system, and increasing the flexibility of the inner ring gear in the planetary gear train will make the load distribution among the planetary gears more uniform. Therefore, it is necessary to propose a flexible inner ring gear with better performance to improve the load sharing performance and dynamic performance of the planetary transmission system. SUMMARY

[0005] Embodiments of the present application provide an L-shaped flexible inner ring gear structure in a planetary transmission system to at least solve the technical problem that the load distribution of the planetary transmission system is uneven and the dynamic vibration is enhanced due to the insufficient structural flexibility of the existing full-fixed inner ring gear.

[0006] To achieve the above-mentioned purpose, embodiments of the present application adopt the following technical solutions:

[0007] An L-shaped flexible inner ring gear structure in a planetary transmission system, comprising:

[0008] An inner ring gear body in the shape of a ring, having a coaxially arranged inner circumferential surface and an outer circumferential surface in the radial direction, and having an upper end surface and a lower end surface in the vertical direction, wherein the inner circumferential surface of the inner ring gear body is a tooth width surface, and a plurality of tooth grooves are uniformly arranged along the circumferential direction of the tooth width surface;

[0009] An extended flexible ring formed by extending the lower end surface of the inner ring gear body in the vertical direction, wherein the extended flexible ring has an adjustable vertical length and a radial thickness, and the overall flexibility of the inner ring gear structure is adjusted by changing the length and thickness of the flexible extended ring.

[0010] The L-shaped flexible inner ring gear structure in the planetary transmission system provided by the embodiment of the present application can improve the overall flexibility of the inner ring gear structure by changing the length and thickness of the extension structure, greatly improve the flexibility of the structure, compensate for the unevenness of the transmission torque of each branch of the system caused by the machining error and installation error of the system components, and help to improve the load sharing performance of the planetary transmission system.

[0011] Further, the fixing mode of the inner ring gear body is changed from the outer circumferential fixing to the bottom fixing. The L-shaped flexible inner ring gear structure in the planetary transmission system improves the overall flexibility by changing the outer circumferential fixing of the original traditional rigid inner ring gear to the bottom fixing.

[0012] Further, the fixing ring is formed by bending the end face of the extension flexible ring away from the inner ring gear body in the horizontal direction.

[0013] Further, the fixing ring extends radially from the inside to the outside to form an annular fixing surface arranged in the horizontal direction.

[0014] Further, the annular fixing surface has an upper fixing surface and a lower fixing surface which are parallel to each other.

[0015] Further, a plurality of fixing holes are uniformly arranged along the circumferential direction of the annular fixing surface of the fixing ring, and the plurality of fixing holes penetrate the upper fixing surface and the lower fixing surface.

[0016] Further, the bottom fixing is realized by the bolt penetrating the fixing hole.

[0017] Further, the reinforcing ring is arranged on the outer circumferential surface of the inner ring gear body.

[0018] Further, the reinforcing ring has a thickness.

[0019] Further, the vertical height of the reinforcing ring is consistent with the height of the upper end surface of the inner ring gear body.

[0020] Beneficial effects: on the one hand, the L-shaped flexible inner ring gear structure in the planetary transmission system proposed by the present application can greatly improve the flexibility of the structure by changing the fixing form to the lower end surface fixing of the inner gear and assisting with the "extension flexible ring" structure, compensate for the unevenness of the transmission torque of each branch of the system caused by the machining error and installation error of the system components, and help to improve the load sharing performance of the planetary transmission system.

[0021] In another aspect, the L-shaped flexible inner ring structure of the planetary transmission system can also reduce the dynamic load coefficient of the internal meshing gear pair in the transmission system, so that the vibration and noise of the planetary transmission system during transmission are reduced.

[0022] Therefore, the L-shaped flexible inner ring structure of the planetary transmission system can solve the demand for structural optimization of the traditional inner ring and the demand for improving the load sharing performance and dynamic load performance of the planetary gear train, and has good practical application value. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is an L-shaped flexible inner ring structure model and setting in a planetary transmission system; wherein (a) is a structure diagram, (b) is a finite element model, and (c) is an assembly body calculation model;

[0024] Figure 2 It is a schematic diagram of inner ring bearing transmission error; wherein (a) is an L-shaped flexible inner ring structure in a planetary transmission system; and (b) is a full fixed inner ring;

[0025] Figure 3 It is a graph of the change rule of the bearing transmission error and the contact stress of the L-shaped flexible inner ring structure in a planetary transmission system with the extension ring length; wherein (a) is the bearing transmission error of the L-shaped flexible inner ring structure in a planetary transmission system; and (b) is the contact stress of the "single tooth meshing area" along the tooth width direction;

[0026] Figure 4 It is a graph of the change rule of the contact stress of the L-shaped flexible inner ring structure in a planetary transmission system with the extension flexible ring length; wherein (a) is the change rule of the maximum contact stress with the extension flexible ring length; and (b) is the change rule of the tooth surface partial load with the extension flexible ring length;

[0027] Figure 5 It is a graph of the change rule of the bearing transmission error of the L-shaped flexible inner ring structure in a planetary transmission system with the extension flexible ring thickness;

[0028] Figure 6 It is a graph of the change rule of the bearing transmission error and the contact stress of the L-shaped flexible inner ring structure in a planetary transmission system with the reinforcement ring thickness; wherein (a) is the bearing transmission error of the L-shaped flexible inner ring structure in a planetary transmission system; and (b) is the contact stress of the "single tooth meshing area" along the tooth width direction;

[0029] Figure 7 It is a graph of the change rule of the tooth surface contact stress of the L-shaped flexible inner ring structure in a planetary transmission system with the reinforcement ring thickness; wherein (a) is the change rule of the maximum contact stress with the reinforcement ring thickness; and (b) is the change rule of the tooth surface partial load with the reinforcement ring thickness;

[0030] Figure 8 The load sharing coefficient of each branch of the system (sun gear and planetary gear);Wherein, (a) is an L-shaped flexible inner ring structure in a planetary transmission system;(b) is a full fixed inner ring;

[0031] Figure 9 The load sharing coefficient of each branch of the system (inner ring and planetary gear);Wherein, (a) is an L-shaped flexible inner ring structure in a planetary transmission system;(b) is a full fixed inner ring;

[0032] Figure 10 The dynamic load coefficient of each branch of the system (inner ring and planetary gear);Wherein, (a) is an L-shaped flexible inner ring structure in a planetary transmission system;(b) is a full fixed inner ring. DETAILED DESCRIPTION

[0033] The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0034] In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0035] The terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0036] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected;It can be mechanically connected, or it can be electrically connected;It can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0037] In the present disclosure, the orientation words such as "axial", "circumferential", "radial" are generally defined with respect to the rotation axis of the rotor in the driving motor, and "inner" and "outer" refer to the inner and outer of the profile of the corresponding components. The purpose of using the terms "first", "second" and the like is to distinguish different components, and does not have the order and importance. In addition, in the following description, when referring to the drawings, the same reference signs in different drawings represent the same or similar elements, unless otherwise explained.

[0038] Please refer to Figure 1 The embodiments of the present application disclose an L-shaped flexible inner ring structure in a planetary transmission system, comprising an inner ring body 1 and an extended flexible ring 2.

[0039] The inner ring body 1 mentioned above is specifically illustrated as follows: the inner ring body 1 is annular, has coaxially arranged inner and outer circumferential surfaces in the radial direction, and has upper and lower end surfaces in the vertical direction. The inner circumferential surface of the inner ring body 1 is a tooth width surface, and a plurality of tooth grooves are uniformly arranged along the circumferential direction of the tooth width surface.

[0040] The extended flexible ring 2 mentioned above is specifically illustrated as follows: the extended flexible ring 2 is vertically extended from the lower end surface of the inner ring body 1. The extended flexible ring 2 has an adjustable vertical length and a radial thickness. The overall flexibility of the inner ring structure is adjusted by changing the length and thickness of the flexible extended ring 2.

[0041] The L-shaped flexible inner ring structure in the planetary transmission system provided by the embodiments of the present application can improve the overall flexibility of the inner ring structure by changing the length and thickness of the extension, greatly improve the flexibility of the structure, compensate for the unevenness of the transmission torque of each branch of the system caused by the machining error and installation error of the system components, and help to improve the load sharing performance of the planetary transmission system.

[0042] The fixing mode of the inner ring body 1 is changed from the outer circumferential fixing to the bottom fixing. The L-shaped flexible inner ring structure in the planetary transmission system changes the outer circumferential fixing of the original traditional rigid inner ring to the bottom fixing, thereby improving the overall flexibility.

[0043] The fixing ring 3 is further included, which is formed by bending the end surface of the extended flexible ring 2 away from the inner ring body 1 in the horizontal direction. The fixing ring 3 extends from the inside to the outside in the radial direction to form a ring-shaped fixing surface arranged in the horizontal direction. The ring-shaped fixing surface has upper and lower fixing surfaces parallel to each other.

[0044] A plurality of fixing holes 31 are evenly arranged along the circumferential direction of the annular fixing surface of the fixing ring 3, and the plurality of fixing holes 31 penetrate the upper fixing surface and the lower fixing surface, and the bottom fixing is achieved by the bolts penetrating the fixing holes 31.

[0045] The reinforcing ring 4 is further included, which is wrapped around the outer circumferential surface of the inner ring body 1, and has a thickness, and the vertical height of the reinforcing ring 4 is consistent with the height of the upper end surface of the inner ring body 1.

[0046] On the one hand, the L-shaped flexible inner ring structure in the planetary transmission system can greatly improve the flexibility of the structure by converting the fixed form to the lower end surface of the inner gear and assisting with the "extended flexible ring" structure, and can compensate for the unevenness of the transmission torque of each branch of the system caused by the machining error and the installation error of the system components, which will help to improve the load sharing performance of the planetary transmission system.

[0047] On the other hand, the L-shaped flexible inner ring structure in the planetary transmission system can also reduce the dynamic load coefficient of the internal meshing gear pair in the transmission system, so that the vibration and noise of the planetary transmission system during transmission are reduced.

[0048] Therefore, the L-shaped flexible inner ring structure in the planetary transmission system can solve the demand for structural optimization of the traditional inner ring and improvement of the load sharing performance and dynamic load performance of the planetary gear train, and has good practical application value.

[0049] More specifically, the L-shaped flexible inner ring structure in the planetary transmission system in the embodiment uses the structural parameters of tooth width 88mm, rim thickness 24mm, extended flexible ring length 58mm, extended flexible ring thickness 6mm, reinforcing ring length 44mm, reinforcing ring thickness 12mm, and the fixing mode is bottom fixing.

[0050] In order to accurately obtain the meshing characteristics of the L-shaped flexible inner ring structure in the planetary transmission system, and obtain the change comparison with the traditional full-fixed inner ring, the finite element parameterized modeling solution method is used to analyze and obtain the load transmission error of the L-shaped flexible inner ring structure in the planetary transmission system and the full-fixed inner ring under the same conditions, and the corresponding change curve is drawn.

[0051] Comparison Figure 2 As can be seen from (a) and (b), the structural flexibility of the L-shaped flexible inner ring structure in the planetary transmission system is significantly increased compared with the full-fixed inner ring, which helps to improve the load sharing performance of the planetary transmission system.

[0052] As can be seen from (a) and (b), the structural flexibility of the L-shaped flexible inner ring structure in the planetary transmission system is significantly increased compared with the full-fixed inner ring, which helps to improve the load sharing performance of the planetary transmission system. Figure 3 As can be seen from (a) and (b), the structural flexibility of the L-shaped flexible inner ring structure in the planetary transmission system is significantly increased compared with the full-fixed inner ring, which helps to improve the load sharing performance of the planetary transmission system.

[0053] Depend on Figure 4 As can be seen, the maximum contact stress on the tooth surface gradually decreases with increasing length of the extended flexible ring, with minimal change in amplitude. It stabilizes when the extended flexible ring length exceeds 58 mm. The eccentric load values ​​at both ends of the tooth width initially stabilize and then gradually increase with increasing length of the extended flexible ring.

[0054] Depend on Figure 5 It can be seen that the structural flexibility can also be improved by reducing the thickness of the extended flexible ring, and as the thickness of the extended flexible ring continues to decrease, the speed of improving the structural flexibility continues to increase.

[0055] Depend on Figure 6 (a) It can be seen that as the thickness of the reinforcement ring decreases, the mean and fluctuation values ​​of the load transmission error continue to increase, but the growth rate continues to slow down.

[0056] Depend on Figure 6 (b) and Figure 7 As shown in (a) and (b), the eccentric load values ​​at both ends of the tooth surface are improved with the increase of the thickness of the reinforcement ring, decreasing linearly, and the distribution of the tooth surface contact stress becomes more uniform. When the thickness of the reinforcement ring is zero, the distribution of the tooth surface contact stress along the tooth width direction is obviously biased to one side. The tooth surface contact stress along the tooth width direction shows a trend of first increasing and then decreasing, and the increasing trend is stronger than the decreasing trend. In addition, with the increase of the thickness of the reinforcement ring, the maximum contact stress on the tooth surface shows a trend of continuous increase. Therefore, it can be fully demonstrated that the reinforcement ring has a significant improvement effect on the eccentric load condition of the contact stress on the tooth surface of the L-shaped flexible inner gear ring structure in a planetary transmission system.

[0057] Figure 8 In the formula, JZXS represents the instantaneous load sharing factor of each branch of the system. The first number 1 represents the sun gear, and the second number represents the i-th planetary gear, which represents different meshing pairs.

[0058] Figure 9 In the equation, JZXS represents the instantaneous load sharing factor of each branch of the system. The first number 2 represents the inner ring gear, and the second number represents the i-th planetary gear, which represents different meshing pairs.

[0059] pass Figure 8 as well as Figure 9Compared with the traditional full fixed inner ring, the load sharing coefficient curve of each inner meshing pair of the traditional full fixed inner ring presents non-smooth transition, which is caused by the sudden jump of the load in the transmission process, which will seriously affect the stability of the transmission system, and lead to the increase of vibration and noise of the transmission system. The load sharing coefficient of the system is significantly reduced by using the L-shaped flexible inner ring structure in the planetary transmission system, which is reduced by 25.88% compared with the system load sharing coefficient of the full fixed inner ring, which indicates that the L-shaped flexible inner ring structure in the planetary transmission system can significantly improve the load sharing performance of the planetary transmission system, and avoid the drawbacks of the load sharing coefficient jump of the inner meshing pair when the full fixed inner ring is used, so that the transmission system is more stable, and the vibration and noise in the transmission process are reduced.

[0060] Figure 10 In the formula, DZXS represents the instantaneous dynamic load coefficient of each branch of the system, the first number 2 represents the inner ring, and the second number represents the i-th planetary gear, which represents different meshing pairs.

[0061] By comparing Figure 10 It can be seen from the comparison that the dynamic load coefficient of the planetary transmission system is larger when the full fixed inner ring is used, and the dynamic load curve of each branch fluctuates sharply, which will lead to the increase of vibration and noise of the planetary transmission system in the transmission process. The dynamic load coefficient of the inner meshing gear pair in the system is significantly reduced after the L-shaped flexible inner ring structure in the planetary transmission system is used, which is reduced by 56.1% compared with the dynamic load coefficient of the inner meshing gear pair in the full fixed inner ring, which indicates that the L-shaped flexible inner ring structure in the planetary transmission system can significantly improve the dynamic load performance of the planetary transmission system. Therefore, it can be seen that the L-shaped flexible inner ring structure in the newly designed planetary transmission system has good structural flexibility, can improve the load sharing of the gear tooth surface contact stress, has the characteristics of improving the load sharing performance and dynamic load performance of the planetary transmission system, and can enhance the stability of the planetary transmission system.

[0062] By combining the drawings and the embodiments, it can be seen that the L-shaped flexible inner ring structure in the planetary transmission system improves the structural flexibility, improves the system load sharing performance, and also improves the system dynamic load performance, and enhances the stability of the planetary transmission system. However, the present application is not limited to the above-mentioned embodiments, and the above-mentioned specific embodiments are only illustrative but not limiting, and those skilled in the art can make many forms under the inspiration of the present application without departing from the scope of the present application and the protection scope of the claims.

[0063] In the description of the present application, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0064] The above merely illustrates the specific embodiments of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An L-shaped flexible internal gear ring structure in a planetary transmission system, characterized in that: include: The inner gear ring body (1) is annular, has an inner circumferential surface and an outer circumferential surface coaxially arranged in the radial direction, and has an upper end surface and a lower end surface in the vertical direction. The inner circumferential surface of the inner gear ring body (1) is a tooth width surface, and a plurality of tooth grooves are evenly arranged along the circumferential direction of the tooth width surface. The extended flexible ring (2) is formed by vertically extending the lower end surface of the inner gear ring body (1). The extended flexible ring (2) has an adjustable vertical length and radial thickness. The overall flexibility of the gear ring structure can be adjusted by changing the length and thickness of the flexible extended ring.

2. The L-shaped flexible inner gear ring structure in a planetary transmission system according to claim 1, characterized in that: The fixing method of the inner gear ring body (1) is transformed from outer circumferential fixing to bottom fixing.

3. The L-shaped flexible inner gear ring structure in a planetary transmission system according to claim 2, characterized in that: Also includes: The fixed ring (3) is formed by bending the end surface of the extended flexible ring (2) away from the inner gear ring body (1) in a horizontal direction.

4. The L-shaped flexible internal gear ring structure in a planetary transmission system according to claim 3, characterized in that: The fixing ring (3) extends radially from inside to outside to form an annular fixing surface arranged in a horizontal direction.

5. The L-shaped flexible internal gear ring structure in a planetary transmission system according to claim 4, characterized in that: The annular fixing surface comprises an upper fixing surface and a lower fixing surface which are parallel to each other.

6. The L-shaped flexible internal gear ring structure in a planetary transmission system according to claim 5, characterized in that: A plurality of fixing holes (31) are evenly provided along the circumferential direction of the annular fixing surface of the fixing ring (3), and the plurality of fixing holes penetrate the upper fixing surface and the lower fixing surface.

7. The L-shaped flexible internal gear ring structure in a planetary transmission system according to claim 6, characterized in that: The bottom is fixed by bolts passing through the fixing holes.

8. The L-shaped flexible internal gear ring structure in a planetary transmission system according to claim 1, characterized in that: Also includes: A reinforcement ring (4) is covered on the outer peripheral surface of the inner gear ring body (1).

9. The L-shaped flexible internal gear ring structure in a planetary transmission system according to claim 8, characterized in that: The reinforcement ring (4) has a thickness.

10. The L-shaped flexible inner gear ring structure in a planetary transmission system according to claim 8, characterized in that: The vertical height of the reinforcement ring (4) is consistent with the height of the upper end surface of the inner gear ring body (1).

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