Flexible rocker arm structure and method for adjusting rigidity of flexible rocker arm structure

Abstract

The invention relates to a flexible rocker arm structure (100). The flexible rocker arm structure (100) is used for a high-pressure compressor of an aero-engine and comprises a flexible rocker arm body (110); at least one flexible rocker arm body insert (10, 20), the flexible rocker arm body insert (10, 20) covering at least a portion of the surface of the flexible rocker arm body (110); and a fastener for detachably fastening the flexible rocker arm body inserts (10, 20) to the flexible rocker arm body (110). The rigidity-adjustable flexible rocker arm is obtained through one or more flexible rocker arm body insertion pieces, the machining, assembling and testing cost is reduced, and the design efficiency of the flexible rocker arm structure is improved.

Description

Technical Field

[0001] The present invention relates to a flexible rocker arm structure, and more specifically, to a flexible rocker arm structure with adjustable stiffness. On the other hand, the present invention also relates to a method for adjusting the stiffness of the flexible rocker arm structure. Background Art

[0002] At present, the first few stages of stator blades of high-pressure compressors in domestic and foreign aircraft engines usually use adjustable stator blades, and adjustment mechanisms are arranged to achieve different installation angle requirements for the adjustable stator blades under different operating conditions.

[0003] As we all know, the consistency of the actual rotation angles of the same-level adjustable stator blades is called circumferential consistency, and the difference between the actual rotation angle and the theoretical rotation angle is called adjustment accuracy. The flexible rocker arm is an important part in the adjustment mechanism for directly controlling the switching angle of the adjustable stator blade. The adjustment mechanism provides driving force through the actuator and reaches the rocker arm through such means as pull rods and linkage rings, and finally controls the switching angle of the adjustable stator blade. Therefore, when the flexible rocker arm is in working state, it needs to withstand the aerodynamic load transmitted from the adjustable stator blade and the driving force transmitted from the actuator. The flexible rocker arm is the core part of the adjustment mechanism for the adjustable stator blade, and it is also the part with the worst actual working conditions in the adjustment mechanism. Its performance is related to the accuracy, accuracy retention and reliability of the adjustment mechanism. Therefore, its structural design is crucial to the circumferential consistency and adjustment accuracy of the same-level adjustable stator blades.

[0004] Generally speaking, the torsional stiffness of a flexible rocker arm will affect the circumferential consistency of the adjustable stator blades of the same level, and the force transmission stiffness of a flexible rocker arm will affect the adjustment accuracy of the adjustable stator blades of the same level. Therefore, it is necessary to conduct a verification test on the relationship between the arm thickness of the flexible rocker arm and the torsional stiffness and force transmission stiffness. In this verification process, it is necessary to design flexible rocker arms with different arm thicknesses to match the optimal circumferential consistency and adjustment accuracy of the adjustable stator blades of the same level. This kind of test is costly, and coupled with the related design, processing and assembly processes, it is inefficient and time-consuming.

[0005] In addition, replacing the flexible rocker arm with different arm thickness will introduce certain nonlinear factors and have an adverse effect on the test results, which further leads to inaccurate results of the verification process and affects the operating efficiency and safety of the high-pressure compressor and aircraft engine.

[0006] In the industry, there are some flexible rocker arm structural solutions designed for adjustable stiffness or improved methods for adjusting the stiffness of the flexible rocker arm.

[0007] For example, in the Chinese invention patent application CN105422514A entitled “A Blade Adjustment Structure” filed by the Shenyang Engine Design Institute of the Aviation Industry Corporation of China on December 25, 2015, a blade adjustment structure is disclosed, which includes a rocker arm, a linkage ring, a positioning pin and a rotating adjustment member, wherein one end of the rocker arm is connected to the stator blade, and the other end is provided with a mounting hole for the rotating adjustment member. A through hole is provided in the center of the rotating adjustment member, and the positioning pin passes through the through hole to connect the linkage ring and the rotating adjustment member, and the rotating adjustment member can rotate around the positioning pin. This rotating adjustment member connects the linkage ring and the rocker arm through the positioning pin, and can rotate around the positioning pin, thereby avoiding the phenomenon that the blade adjustment accuracy is affected due to deformation of the rocker arm when the linkage rotates around its own rotating axis.

[0008] However, since a rotary adjusting member needs to be specially designed for the blade adjusting structure and holes need to be punched on the rotary adjusting member according to the size of the positioning pin, the manufacturing process of the blade adjusting structure is slightly complicated and the cost is relatively high.

[0009] For another example, in the Chinese invention patent CN103277339B entitled "Compressor multi-stage stationary blade adjustment mechanism with universal joint" filed by Shanghai Jiaotong University on June 26, 2013, an improved stationary blade adjustment mechanism is disclosed, which includes a casing with an output mechanism and a drive mechanism and a transmission mechanism fixedly arranged outside the casing, one end of the output mechanism is radially arranged inside the casing and the other end is connected to the transmission mechanism outside the casing, and the drive mechanism is axially arranged outside the casing and connected to the transmission mechanism to transmit power. Compared with the previous related solutions, this design is not only more compact and requires less movement space, but also the rocker arm will not deform during the movement, thereby improving the life and precision of the adjustment mechanism.

[0010] However, the above technical solution is more complicated because two perpendicularly intersecting universal joints are required to ensure that the rocker arm connected to the independent blade does not deform during movement. Although the number of ball joints is reduced, and thus the processing difficulty and cost required are reduced, mass production is still difficult and it is difficult to promote and apply on a large scale.

[0011] To this end, it is necessary to design an improved flexible rocker arm structure, which can conveniently adjust the thickness of the flexible rocker arm body in a simple and inexpensive way, so as to obtain a flexible rocker arm with appropriate stiffness according to the circumferential consistency and adjustment accuracy of the same-level adjustable stator blades. Summary of the invention

[0012] The object of the present invention is to provide a flexible rocker arm structure, which can conveniently adjust the thickness of the flexible rocker arm body in a simple and inexpensive manner, so as to obtain a flexible rocker arm with appropriate stiffness according to the circumferential consistency and adjustment accuracy of adjustable stator blades of the same level.

[0013] Another object of the present invention is to provide a method for adjusting the stiffness of a flexible rocker arm structure.

[0014] According to the first aspect of the present invention, there is provided a flexible rocker arm structure, which is used for a high-pressure compressor of an aircraft engine. The flexible rocker arm structure comprises: a flexible rocker arm body; at least one flexible rocker arm body insert, which covers at least a portion of the surface of the flexible rocker arm body; and a fastener for fastening the flexible rocker arm body insert to the flexible rocker arm body.

[0015] In the above technical solution, the term "insert sheet" refers to a thin sheet with a predetermined unit thickness, which is formed based on the contour of the surface of the part to be adhered, so that it can be easily and conveniently covered on the surface of the part and thereby increase the local volume of the part. This insert sheet is usually also called a "patch" or other names with equivalent meanings.

[0016] In addition, the term "covering" means placing the insert sheet on the surface of the part to be adhered and covering the surface, and does not include using bonding, fixing, welding and other means to fix the insert sheet to the surface of the part in an irremovable manner.

[0017] Preferably, some or all of the flexible rocker arm body inserts may cover at least a portion of the upper surface of the flexible rocker arm body, and / or some or all of the flexible rocker arm body inserts may cover at least a portion of the lower surface of the flexible rocker arm body.

[0018] The above technical solutions can be divided into the following technical solutions:

[0019] (i) some of the flexible rocker arm body inserts cover at least a portion of the upper surface of the flexible rocker arm body, and the remaining of the flexible rocker arm body inserts cover at least a portion of the lower surface of the flexible rocker arm body;

[0020] (ii) all of the flexible rocker arm body inserts cover at least a portion of the upper surface of the flexible rocker arm body; and

[0021] (iii) All of the flexible rocker arm body inserts cover at least a portion of the lower surface of the flexible rocker arm body.

[0022] Preferably, the flexible rocker arm body insert may include a flexible rocker arm body upper insert covering at least a portion of the upper surface of the flexible rocker arm body and a flexible rocker arm body lower insert covering at least a portion of the lower surface of the flexible rocker arm body.

[0023] More preferably, the flexible rocker arm arm upper insert may include some or all of the first arm body upper insert, the second arm body upper insert and the third arm body upper insert that can be stacked on each other, and the flexible rocker arm arm body lower insert may include some or all of the first arm body lower insert, the second arm body lower insert and the third arm body lower insert that can be stacked on each other.

[0024] In the above embodiment, at least a portion of the flexible rocker arm body may include: a first arm body thick end; a second arm body thick end opposite to the first arm body thick end; and a thinner middle section of the arm body located between the first arm body thick end and the second arm body thick end.

[0025] The terms “thick end” and “thinner section” are based on the thickness of each portion of the flexible rocker arm body in a direction perpendicular to the central axis of the flexible rocker arm body, wherein the thickness of the thick end is significantly greater than the thickness of the thinner section.

[0026] On the other hand, the fastener may include a mating pair of connecting bolts and nuts.

[0027] Preferably, the connecting bolts may include a first connecting bolt and a second connecting bolt, and the nuts include a first nut and a second nut, wherein the first connecting bolt and the first nut fix the flexible rocker arm body insert at the first arm body thick end, and the second connecting bolt and the second nut fix the flexible rocker arm body insert at the second arm body thick end.

[0028] In the above embodiment, the thick end of the first arm body can be connected to one of the adjustable stator blades and the linkage ring of the high-pressure compressor via a first connecting head, and the thick end of the second arm body can be connected to the other of the adjustable stator blades and the linkage ring of the high-pressure compressor via a second connecting head.

[0029] According to a second aspect of the present invention, there is provided a method for adjusting the stiffness of a flexible rocker arm structure as previously described, comprising: determining the desired stiffness of the flexible rocker arm structure according to actual working conditions; covering at least one flexible rocker arm arm body insert on the surface of at least a portion of the flexible rocker arm body to change the stiffness of the flexible rocker arm structure until the desired stiffness of the flexible rocker arm structure is reached; and fastening the flexible rocker arm arm body insert to the flexible rocker arm body.

[0030] Preferably, covering at least one flexible rocker arm body insert on the surface of at least a portion of the flexible rocker arm body may include: covering some or all of the flexible rocker arm body inserts on the upper surface of at least a portion of the flexible rocker arm body, and / or covering some or all of the flexible rocker arm body inserts on the lower surface of at least a portion of the flexible rocker arm body.

[0031] The above technical solutions can be divided into the following technical solutions:

[0032] (i) firstly, some of the flexible rocker arm body inserts cover at least a portion of the upper surface of the flexible rocker arm body, and then the remaining inserts of the flexible rocker arm body cover at least a portion of the lower surface of the flexible rocker arm body;

[0033] (ii) firstly, some of the flexible rocker arm body inserts cover at least a portion of the lower surface of the flexible rocker arm body, and then the remaining inserts of the flexible rocker arm body cover at least a portion of the upper surface of the flexible rocker arm body;

[0034] (iii) alternately covering the upper and lower surfaces of at least a portion of the flexible rocker arm body with the flexible rocker arm body inserts;

[0035] (iv) covering at least a portion of the upper surface of the flexible rocker arm body with all of the flexible rocker arm body inserts; and

[0036] (v) All of the flexible rocker arm body inserts cover at least a portion of the lower surface of the flexible rocker arm body.

[0037] More preferably, the upper insert of the flexible rocker arm body may include some or all of the first arm body upper insert, the second arm body upper insert and the third arm body upper insert, each of these upper inserts is overlapped with each other and covers the upper surface of at least a portion of the flexible rocker arm body, and the lower insert of the flexible rocker arm body may include some or all of the first arm body lower insert, the second arm body lower insert and the third arm body lower insert, each of these lower inserts is overlapped with each other and covers the lower surface of at least a portion of the flexible rocker arm body.

[0038] In the above embodiment, at least a portion of the flexible rocker arm body may include: a first arm body thick end; a second arm body thick end opposite to the first arm body thick end; and a thinner middle section of the arm body located between the first arm body thick end and the second arm body thick end.

[0039] The flexible rocker arm structure according to the present invention can obtain the following advantages:

[0040] (1) By using one or more flexible rocker arm body inserts to obtain a flexible rocker arm with adjustable stiffness, there is no need to produce a large number of flexible rocker arms with different arm body thicknesses to match the appropriate stiffness in the force transmission direction and the torsional direction. The same-level adjustable stator blades of the aircraft engine can have excellent circumferential consistency and adjustment accuracy, thereby reducing the costs of processing, assembly and testing.

[0041] (2) The user only needs to perform one installation to adjust the stiffness in the force transmission direction and the torsional direction of the flexible rocker arm by changing the thickness of the arm body of the flexible rocker arm, thereby improving the design efficiency of the flexible rocker arm structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to further illustrate the technical effect of the flexible rocker arm structure according to the present invention, the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments, wherein:

[0043] Figure 1 A schematic top view of a flexible rocker arm structure according to the present invention is shown;

[0044] Figure 2 A schematic front view of a flexible rocker arm structure according to the present invention is shown;

[0045] Figure 3 is a partial schematic diagram of a first example of a flexible rocker arm structure according to the present invention;

[0046] Figure 4 is a partial schematic diagram of a second example of a flexible rocker arm structure according to the present invention;

[0047] Figure 5 is a partial schematic diagram of a third example of a flexible rocker arm structure according to the present invention; and

[0048] Figure 6 FIG. 4 is a partial schematic diagram of a fourth example of a flexible rocker arm structure according to the present invention.

[0049] Reference numerals

[0050] 1 First connector

[0051] 2 Thick end of the first arm

[0052] 3 Thick end of the second arm

[0053] 4 The thinner section in the middle of the arm

[0054] 5 First connecting bolt

[0055] 6 Second connecting bolt

[0056] 7 First nut

[0057] 8 Second nut

[0058] 9 Second connector

[0059] 10 Flexible rocker arm upper insert

[0060] 11 Insert on the first arm

[0061] 12 Second arm upper insert

[0062] 13 Second arm upper insert

[0063] 20 Flexible rocker arm lower insert

[0064] 21 First arm lower insert

[0065] 22 Second arm lower insert

[0066] 23 Second arm lower insert

[0067] 100 Flexible rocker arm structure

[0068] 110 Flexible rocker arm body DETAILED DESCRIPTION

[0069] The structure, working principle and technical effects of the flexible rocker arm structure according to the present invention are described below with reference to the accompanying drawings.

[0070] It should be clear that the embodiments described in this specification only cover some embodiments of the present invention, not all embodiments. Based on the embodiments recorded in the specification, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0071] Unless otherwise defined, all technical and scientific terms used in the present invention have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The terms "including" and "having" in the specification and claims of the present invention and the above-mentioned accompanying drawings and any variations thereof are intended to cover non-exclusive inclusions. The singular forms "a", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0072] Based on the same understanding of orientation, in the description of the present invention, the orientation or position relationship indicated by the terms "upper", "lower", "inside" and "outside" is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0073] As is known to all, the greater the force transmission direction stiffness of the flexible rocker arm, the more accurate the rocker arm movement is, but it will also increase the torsional stiffness. Therefore, while ensuring the force transmission direction stiffness, it is necessary to reduce the torsional stiffness as much as possible to avoid introducing excessive additional load during the driving force transmission process.

[0074] When the size of the flexible rocker arm is certain, its stiffness cannot be adjusted. Usually, a large number of flexible rocker arm structures of different sizes are required to match the flexible rocker arm with the optimal stiffness in the force transmission direction and the torsional direction.

[0075] Figure 1 and Figure 2 The top view and front view schematic diagrams of the flexible rocker arm structure according to the present invention are shown respectively. As shown in the figure, the flexible rocker arm structure 100 includes a flexible rocker arm body 110, at least one flexible rocker arm body insert and a fastener for detachably fastening the flexible rocker arm body insert to the flexible rocker arm body 110.

[0076] The flexible rocker arm body 110 is generally in the shape of a slender rod. Figure 1 As shown, the flexible rocker arm body 110 has a constant width along its length when viewed from above. Figure 2 As shown, the thickness of the flexible rocker arm body 110 in the direction perpendicular to the central axis of the flexible rocker arm body when viewed from the front is different from each other in each part. Therefore, the flexible rocker arm body 110 includes a first arm body thick end 2, a second arm body thick end 3 opposite to the first arm body thick end 2, and a thinner section 4 in the middle of the arm body between the first arm body thick end 2 and the second arm body thick end 3. That is, the flexible rocker arm body 110 presents a slender rod shape with relatively thick ends at both ends and relatively thin in the middle. The thinner section 4 in the middle of the arm body can be formed at the middle position of the arm body of the flexible rocker arm body 110, or it can be formed near the upper side of the arm body or near the lower side of the arm body.

[0077] A first connector 1 and a second connector 9 are formed on the outside of the first arm body thick end 2 and the second arm body thick end 3 of the flexible rocker arm body 110, respectively. The first arm body thick end 2 is connected to the adjustable stator blade of the high-pressure compressor via the first connector 1, and the second arm body thick end 3 is connected to the linkage ring of the high-pressure compressor via the second connector 9. Of course, the components connected by the first connector 1 and the second connector 9 can also be interchanged with each other, and these variations should fall within the protection scope of the present invention.

[0078] The flexible rocker arm body insert is a thin sheet with a predetermined unit thickness (eg, 1 mm) which is formed based on the contour of the surface of the part to be adhered, so that it can be easily and conveniently covered on the surface of the part and thereby increase the local volume of the part.

[0079] The expected stiffness of the flexible rocker arm structure 100 is determined according to the actual working conditions, and the number of flexible rocker arm body inserts required is calculated accordingly. The flexible rocker arm body inserts include a flexible rocker arm body upper insert 10 covering the upper surface of the first arm body thick end 2, the second arm body thick end 3 and the middle thinner section 4 of the flexible rocker arm body 110, and a flexible rocker arm body lower insert 20 covering the lower surface of the first arm body thick end 2, the second arm body thick end 3 and the middle thinner section 4 of the flexible rocker arm body 110. This is because the force transmission direction stiffness and torsion direction stiffness of the flexible rocker arm body 110 are mainly determined by the thinner position 4 in the middle of the arm body.

[0080] Under normal circumstances, some of the flexible rocker arm body inserts 10, 20, namely the flexible rocker arm arm body upper insert 10, cover the upper surfaces of the first arm body thick end 2, the second arm body thick end 3 and the middle thinner section 4 of the flexible rocker arm body 110, and the remaining inserts of the flexible rocker arm body, namely the flexible rocker arm arm body lower insert 20, cover the lower surfaces of the first arm body thick end 2, the second arm body thick end 3 and the middle thinner section 4 of the flexible rocker arm body 110.

[0081] Of course, if all the flexible rocker arm body inserts are flexible rocker arm arm body upper inserts 10, they can all be used to cover the upper surfaces of the first arm body thick end 2, the second arm body thick end 3 and the thinner middle section 4 of the flexible rocker arm body 110; if all the flexible rocker arm body inserts are flexible rocker arm arm body lower inserts 20, they can all be used to cover the lower surfaces of the first arm body thick end 2, the second arm body thick end 3 and the thinner middle section 4 of the flexible rocker arm body 110. The above technical scheme is also feasible and should also fall within the protection scope of the present invention.

[0082] For example, the flexible rocker arm arm upper plug 10 may include a first arm body upper plug 11, a second arm body upper plug 12, a third arm body upper plug 13, or more arm body upper plugs, which can be stacked on each other, and the number of which is determined according to the actual working conditions; similarly, the flexible rocker arm arm lower plug 20 may include a first arm body lower plug 21, a second arm body lower plug 22 and a third arm body lower plug 23, which can be stacked on each other, or more arm body upper plugs, which the number is determined according to the actual working conditions.

[0083] The fasteners for detachably fastening the flexible rocker arm body inserts 10, 20 to the flexible rocker arm body 110 may include various types of fasteners. For example, the fasteners include connecting bolts and nuts that match in pairs. The connecting bolts may include a first connecting bolt 5 and a second connecting bolt 6, and the nuts may include a first nut 7 and a second nut 8. The first connecting bolt 5 and the first nut 7 fix one or more flexible rocker arm body inserts 10, 20 at the first arm body thick end 2, and the second connecting bolt 6 and the second nut 8 fix one or more flexible rocker arm body inserts 10, 20 at the second arm body thick end 3, thereby assembling these flexible rocker arm body inserts 10, 20 together.

[0084] Of course, those skilled in the art can also select other fasteners to replace the connecting bolts and nuts based on the common knowledge in the art, change the installation position and quantity of the fasteners, etc. These modifications are easy to make for those skilled in the art and should fall within the scope of protection of the present invention.

[0085] The use order of the flexible rocker arm body insert piece can be to cover the upper surface of the rocker arm first, or to cover the lower surface of the rocker arm first, or to cover the upper and lower surfaces of the rocker arm randomly and alternately.

[0086] In the test of the relationship between the arm thickness of the flexible rocker arm used in the adjustment mechanism of the aircraft engine and the stiffness in the force transmission direction and the stiffness in the torsional direction, the stiffness in the force transmission direction and the stiffness in the torsional direction of the flexible rocker arm structure 100 with adjustable stiffness can be changed by changing the number, position and covering order of the flexible rocker arm arm inserts, and the adjustable stator blades of the same level can be matched to have the optimal circumferential consistency and adjustment accuracy, thereby ensuring that the aircraft engine has excellent aerodynamic performance.

[0087] The following will be based on Figure 3-6 Several examples of the flexible rocker arm structure 100 according to the present invention are briefly described.

[0088] First example

[0089] Figure 3 A first example of a flexible rocker arm structure 100 according to the present invention is shown. Figure 3 As shown, the first arm body upper insert 11 is covered on the upper surface of the first arm body thick end 2, the middle thinner section 4 of the arm body, and the second arm body thick end 3 (not shown in the figure) of the flexible rocker arm body 110, and one end of the first arm body upper insert 11 is fixed at the first arm body thick end 2 by means of a pair of matching connecting bolts and nuts, that is, via the first connecting bolt 5 and the first nut 7, and the other end of the first arm body upper insert 11 is fixed at the second arm body thick end 3 (not shown in the figure) via the second connecting bolt 6 and the second nut 8.

[0090] In this example, only one insert is used on the flexible rocker arm body, so the rocker arm stiffness that can be adjusted by this example is relatively small.

[0091] Second example

[0092] Figure 4 A second example of a flexible rocker arm structure 100 according to the present invention is shown. Figure 4 As shown, the first arm body upper insert 11 and the second arm body upper insert 12 are covered on the upper surface of the first arm body thick end 2, the middle thinner section 4 of the arm body and the second arm body thick end 3 (not shown in the figure) of the flexible rocker arm body 110, wherein the second arm body upper insert 12 is superimposed on the first arm body upper insert 11. With the aid of a pair of matching connecting bolts and nuts, i.e., via the first connecting bolt 5 and the first nut 7, one end of the first arm body upper insert 11 and the second arm body upper insert 12 is fixed at the first arm body thick end 2, and via the second connecting bolt 6 and the second nut 8, the other end of the first arm body upper insert 11 and the second arm body upper insert 12 is fixed at the second arm body thick end 3 (not shown in the figure).

[0093] In this example, only two inserts are used on the flexible rocker arm body, so the rocker arm stiffness that can be adjusted by this example is greater than that of the first example.

[0094] Third Example

[0095] Figure 5 FIG. 2 shows a third example of a flexible rocker arm structure 100 according to the present invention. Figure 5 As shown, the first arm body upper insert 11, the second arm body upper insert 12 and the third arm body upper insert 13 are covered on the upper surface of the first arm body thick end 2, the middle thinner section 4 of the arm body and the second arm body thick end 3 (not shown in the figure) of the flexible rocker arm body 110, wherein the third arm body upper insert 13 is superimposed on the second arm body upper insert 12, and the second arm body upper insert 12 is superimposed on the first arm body upper insert 11. With the help of paired matching connecting bolts and nuts, that is, via the first connecting bolt 5 and the first nut 7, one end of the first arm body upper insert 11, the second arm body upper insert 12 and the third arm body upper insert 13 is fixed at the first arm body thick end 2, and the other end of the first arm body upper insert 11, the second arm body upper insert 12 and the third arm body upper insert 13 is fixed at the second arm body thick end 3 (not shown in the figure) via the second connecting bolt 6 and the second nut 8.

[0096] In this example, only three inserts are used on the flexible rocker arm body, so the rocker arm stiffness that can be adjusted by this example is greater than that of the second example.

[0097] Fourth Example

[0098] Figure 6 FIG. 4 shows a fourth example of a flexible rocker arm structure 100 according to the present invention. Figure 6 As shown, the first arm body upper insert 11, the second arm body upper insert 12 and the third arm body upper insert 13 are covered on the upper surface of the first arm body thick end 2, the middle thinner section 4 of the arm body and the second arm body thick end 3 (not shown in the figure) of the flexible rocker arm body 110, and the first arm body lower insert 21, the second arm body lower insert 22 and the third arm body lower insert 23 are covered on the lower surface of the first arm body thick end 2, the middle thinner section 4 and the second arm body thick end 3 (not shown in the figure) of the flexible rocker arm body 110, wherein the third arm body upper insert 13 is superimposed on the second arm body upper insert 12, the second arm body upper insert 12 is superimposed on the first arm body upper insert 11, the second arm body lower insert 22 is superimposed on the third arm body lower insert 23, and the first arm body lower insert 21 is superimposed on the second arm body lower insert 22. With the aid of paired connecting bolts and nuts, i.e., via the first connecting bolt 5 and the first nut 7, one ends of the first arm body upper plug 11, the second arm body upper plug 12 and the third arm body upper plug 13 and the first arm body lower plug 21, the second arm body lower plug 22 and the third arm body lower plug 23 are fixed at the first arm body thick end 2, and the other ends of the first arm body upper plug 11, the second arm body upper plug 12 and the third arm body upper plug 13 and the first arm body lower plug 21, the second arm body lower plug 22 and the third arm body lower plug 23 are fixed at the second arm body thick end 3 via the second connecting bolt 6 and the second nut 8 (not shown in the figure).

[0099] In this example, not only the flexible rocker arm upper insert is used, but also the flexible rocker arm lower insert is used, and a total of six inserts are used. Therefore, the rocker arm stiffness that can be adjusted in this example is greater than all previous examples.

[0100] Although the flexible rocker arm structure and its working principle according to the present invention are described above in combination with the preferred embodiments and the accompanying drawings, it should be recognized by those skilled in the art that the above examples are only for illustration and cannot be used as limitations of the present invention. Therefore, the present invention can be modified and varied within the spirit of the claims, and these modifications and variations will fall within the scope required by the claims of the present invention.

Claims

1. A flexible rocker arm structure (100), the flexible rocker arm structure (100) being used for a high-pressure compressor of an aircraft engine, the flexible rocker arm structure (100) comprising: A flexible rocker arm body (110); at least one flexible rocker arm body insert (10, 20), the flexible rocker arm body insert (10, 20) covering at least a portion of the surface of the flexible rocker arm body (110); and A fastener is used to detachably fasten the flexible rocker arm body insert (10, 20) to the flexible rocker arm body (110).

2. The flexible rocker arm structure (100) according to claim 1, characterized in that: Some or all of the flexible rocker arm body inserts (10, 20) cover at least a portion of the upper surface of the flexible rocker arm body (110), and / or some or all of the flexible rocker arm body inserts (10, 20) cover at least a portion of the lower surface of the flexible rocker arm body (110).

3. The flexible rocker arm structure (100) according to claim 2, characterized in that: The flexible rocker arm body insert (10, 20) comprises a flexible rocker arm body upper insert (10) covering at least a portion of the upper surface of the flexible rocker arm body (110) and a flexible rocker arm body lower insert (20) covering at least a portion of the lower surface of the flexible rocker arm body (110). The flexible rocker arm upper insert (10) preferably includes some or all of a first arm upper insert (11), a second arm upper insert (12) and a third arm upper insert (13) which can be stacked on each other, and the flexible rocker arm lower insert (20) preferably includes some or all of a first arm lower insert (21), a second arm lower insert (22) and a third arm lower insert (23) which can be stacked on each other.

4. The flexible rocker arm structure (100) according to any one of claims 1 to 3, characterized in that: At least a portion of the flexible rocker arm body (110) comprises: The first arm body thick end (2); a second arm body thick end (3) opposite to the first arm body thick end (2); and A relatively thin section (4) in the middle of the arm body is located between the first thick end (2) of the arm body and the second thick end (3) of the arm body.

5. The flexible rocker arm structure (100) according to claim 4, characterized in that: The fasteners include a pair of matching connecting bolts and nuts, wherein the connecting bolts preferably include a first connecting bolt (5) and a second connecting bolt (6), and the nuts preferably include a first nut (7) and a second nut (8), and wherein the first connecting bolt (5) and the first nut (7) fix the flexible rocker arm body insert (10, 20) at the first arm body thick end (2), and the second connecting bolt (6) and the second nut (8) fix the flexible rocker arm body insert (10, 20) at the second arm body thick end (3).

6. The flexible rocker arm structure (100) according to claim 4, characterized in that: The first arm body thick end (2) is connected to one of the adjustable stationary blades and the linkage ring of the high-pressure compressor via a first connecting head (1), and the second arm body thick end (3) is connected to the other of the adjustable stationary blades and the linkage ring of the high-pressure compressor via a second connecting head (9).

7. A method for adjusting the stiffness of the flexible rocker arm structure (100) according to claim 1, comprising: Determining the expected stiffness of the flexible rocker arm structure (100) according to actual working conditions; Covering at least one flexible rocker arm body insert (10, 20) on at least a portion of the surface of the flexible rocker arm body (110) to change the stiffness of the flexible rocker arm structure (100) until the desired stiffness of the flexible rocker arm structure (100) is achieved; as well as The flexible rocker arm body inserts (10, 20) are fastened to the flexible rocker arm body (110).

8. The method according to claim 7, characterized in that Covering at least one flexible rocker arm body insert (10, 20) on at least a portion of the surface of the flexible rocker arm body (110) comprises: Some or all of the flexible rocker arm body inserts (10, 20) are covered on at least a portion of the upper surface of the flexible rocker arm body (110), and / or Some or all of the flexible rocker arm body inserts (10, 20) are covered on the lower surface of at least a portion of the flexible rocker arm body (110).

9. The method according to claim 8, characterized in that The flexible rocker arm upper insert (10) comprises some or all of a first arm upper insert (11), a second arm upper insert (12) and a third arm upper insert (13), each of which can be overlapped and covered on the upper surface of at least a part of the flexible rocker arm body (110). The flexible rocker arm lower insert (20) includes some or all of a first arm lower insert (21), a second arm lower insert (22) and a third arm lower insert (23), and each of these lower inserts can be overlapped and covered on the lower surface of at least a portion of the flexible rocker arm body (110).

10. The method according to any one of claims 7 to 9, characterized in that At least a portion of the flexible rocker arm body (110) comprises: The first arm body thick end (2); a second arm body thick end (3) opposite to the first arm body thick end (2); and A relatively thin section (4) in the middle of the arm body is located between the first thick end (2) of the arm body and the second thick end (3) of the arm body.

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