Rocker arm assembly for adjusting engine vane angle and engine vane assembly

Abstract

This disclosure relates to a rocker arm assembly for adjusting the angle of engine blades and an engine blade assembly. The rocker arm assembly includes: a rocker arm with a groove at one end of its bottom for receiving a boss of a blade; the groove has a longitudinal first through hole and engages with the boss to rotate the blade; a bushing with a second through hole coaxial with the first through hole, the bushing passing through the first through hole and having a clearance fit with the inner wall of the first through hole; a stud with a first thread at its top and a second thread at its bottom, passing through the second through hole, the second thread being used for threaded connection with a threaded hole in the blade extending longitudinally from the top of the boss; and a nut connected to the first thread of the stud, its bottom surface abutting against the top surface of the bushing. The rocker arm assembly of this disclosure includes a bushing, which improves the accuracy of installation and positioning between components, prevents loosening of fasteners, avoids safety accidents, and thus improves the reliability of torque transmission by the rocker arm.

Description

Technical Field

[0001] This disclosure relates to the field of aero-engines, and specifically to rocker arm assemblies and engine blade assemblies for adjusting the angle of engine blades. Background Technology

[0002] Aero engines adjust the angle of adjustable blades via an adjustment mechanism. This mechanism is driven by a hydraulic actuator, which in turn drives the adjustable blades to rotate via a torsion bar, connecting rod, linkage ring, and rocker arm. The rocker arm directly transmits torque to control the rotation of the adjustable blades.

[0003] Rocker arms are divided into rigid rocker arms and flexible rocker arms. The structures for transmitting torque between the two types of rocker arms and adjustable blades are basically the same. Both involve a precise clearance fit between the square groove of the rocker arm and the square boss of the adjustable blade. They are connected by applying a pre-tightening force through fasteners such as bolts, nuts, studs, and threaded sleeves. The contact surfaces of the rocker arm and the adjustable blade are kept fixed by friction and will not slide along the direction of the rocker arm groove. However, due to the gap between the square groove of the rocker arm and the square boss of the adjustable blade, there is a certain amount of small rotation space. Even with the torque applied by the fasteners, the rocker arm drives the adjustable blade to rotate back and forth over a long period of time. Due to the existence of this small movement space, the rocker arm will continuously loosen the fasteners through the friction torque generated by the contact and pressure between the rocker arm and the fasteners. It will also wear down the contact surfaces between the rocker arm and the fasteners. Since the hole through which the rocker arm enters the fastener is not checked regularly, if the fastener torque is not checked regularly, the fasteners will loosen over time, causing the connection between the rocker arm and the adjustable blades to loosen, affecting the accuracy of the adjustment. In severe cases, the nut and rocker arm may even fly off, affecting flight safety. Summary of the Invention

[0004] To overcome the problems existing in the related art, this disclosure provides an exemplary rocker arm assembly for adjusting the angle of engine blades and an engine blade assembly.

[0005] An exemplary embodiment of the first aspect of this disclosure provides a rocker arm assembly for adjusting the angle of an engine blade, comprising: a rocker arm having a groove at one end of its bottom for receiving a boss of the blade, the groove having a longitudinal first through hole, the groove being used to engage with the boss to drive the blade to rotate; a bushing having a second through hole coaxial with the first through hole, the bushing being disposed through the first through hole and having a clearance fit with the inner wall of the first through hole; a stud having a first thread at its top and a second thread at its bottom, being disposed through the second through hole, the second thread being used to be threadedly connected to the blade in a connection hole longitudinally opened from the top of the boss; and a nut being connected to the first thread of the stud, the bottom surface of which abuts against the top surface of the bushing.

[0006] In some embodiments, the top of the bushing is provided with a shoulder that protrudes radially outward, the upper surface of the shoulder serves as the top surface of the bushing and abuts against the bottom surface of the nut, and the lower surface of the shoulder is spaced from the upper surface of the rocker arm.

[0007] In some embodiments, the hardness of the bushing is lower than that of the rocker arm.

[0008] In some embodiments, the groove includes two opposing sidewalls, with the two sidewalls positioned between each other to accommodate the boss, and the distance between the two sidewalls is greater than the width of the boss.

[0009] In some embodiments, the rocker arm assembly further includes a positioning ring, sleeved on the stud, for positioning connection with the connecting hole.

[0010] In some embodiments, the positioning ring is integrally formed with or interference-fitted with the stud.

[0011] Secondly, according to some other exemplary embodiments, this disclosure also provides an engine blade assembly, including: a blade with a boss at its top, the blade having a connecting hole longitudinally formed from the top of the boss, the connecting hole having an internal thread; a rocker arm with a groove at one end, the groove accommodating the boss, the inner wall of the groove cooperating with the boss to drive the blade to rotate, the groove having a first through hole coaxial with the connecting hole; a bushing with a second through hole coaxial with the first through hole, the bushing passing through the first through hole and having a clearance fit with the inner wall of the first through hole and the inner wall of the connecting hole; a stud with a first thread at its top and a second thread at its bottom, passing through the second through hole and extending into the connecting hole, the second thread connecting with the internal thread in the connecting hole; and a nut connected to the first thread, the bottom surface abutting against the top surface of the bushing.

[0012] In some embodiments, the groove includes two opposing sidewalls, with the boss located between the two sidewalls, and the distance between the two sidewalls is greater than the width of the boss.

[0013] In some embodiments, a first stepped surface is provided in the connecting hole, which abuts against the bottom end of the bushing; the top end of the bushing is provided with a shoulder that protrudes radially outward, the upper surface of the shoulder serves as the top surface of the bushing and abuts against the bottom surface of the nut, and the lower surface of the shoulder is spaced from the upper surface of the rocker arm.

[0014] In some embodiments, a second stepped surface is provided in the connecting hole; the engine blade assembly further includes: a positioning ring, sleeved on the stud, with its lower end face abutting against the second stepped surface.

[0015] The technical solutions provided by the embodiments of this disclosure may include the following beneficial effects: The rocker arm assembly of this disclosure is provided with a bushing, which performs secondary positioning of the rocker arm and the blade through the bushing, preventing the rocker arm from moving relative to the blade in the radial direction, thereby improving the accuracy of the installation and positioning between components; there are small gaps between the rocker arm and the bushing, as well as between the rocker arm and the blade, and slight friction between the rocker arm and the bushing will not cause the fasteners to loosen, avoiding the occurrence of safety accidents, thereby improving the reliability of the rocker arm in transmitting torque.

[0016] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0017] This disclosure can be better understood by describing exemplary embodiments of the present disclosure in conjunction with the accompanying drawings, in which:

[0018] Figure 1 This is a schematic diagram of an engine blade assembly structure shown according to an exemplary embodiment disclosed in a publication;

[0019] Figure 2 This is a schematic diagram of a rocker arm assembly structure shown according to an exemplary embodiment disclosed in a publication;

[0020] Figure 3 This is a schematic diagram of a rocker arm assembly structure shown according to an exemplary embodiment disclosed in a publication;

[0021] Figure 4 This is a schematic diagram of a rocker arm assembly structure shown according to an exemplary embodiment disclosed in a publication;

[0022] Figure 5 This is a schematic diagram of a bushing structure shown according to an exemplary embodiment disclosed in a publication;

[0023] Figure 6 This is a schematic diagram of the boss structure of a blade according to an exemplary embodiment disclosed in a publication. Detailed Implementation

[0024] The following describes specific embodiments of this disclosure. It should be noted that, in order to provide a concise description, this specification cannot exhaustively describe all features of the actual embodiments. It should be understood that, in the actual implementation of any embodiment, just as in any engineering or design project, various specific decisions are often made to achieve the developer's specific goals and to meet system-related or business-related constraints, and this can change from one embodiment to another. Furthermore, it is understood that although the efforts made in this development process may be complex and lengthy, for those skilled in the art related to the content disclosed in this disclosure, changes in design, manufacturing, or production based on the technical content disclosed in this disclosure are merely conventional technical means and should not be construed as insufficient content of this disclosure.

[0025] Unless otherwise defined, the technical or scientific terms used in the claims and description shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this patent application description and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. The terms “an” or “a” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “comprising” or “including” and similar terms mean that the element or object preceding “comprising” or “including” encompasses the element or object listed following “comprising” or “including” and its equivalents, and do not exclude other elements or objects. The terms “connected” or “linked” and similar terms are not limited to physical or mechanical connections, nor are they limited to direct or indirect connections.

[0026] To solve the aforementioned technical problems, such as Figures 1-5As shown, this disclosure provides a rocker arm assembly for adjusting the angle of an engine blade, which may include: a rocker arm 110, a bushing 120, a stud 130, and a nut 140. In this embodiment, the engine blade 200 can be an aero-engine blade 200, and the angle of the blade 200 can be adjusted by the rocker arm assembly. The aero-engine has multiple blades 200, and each blade 200 can be configured with a corresponding rocker arm assembly, which can be driven by a hydraulic actuator. The rocker arm 110 is rotated through a torsion bar, connecting rod, and linkage ring, thereby directly transmitting torque to the blade 200 to achieve the rotation of the blade 200 and change its angle. The blade 200 may have a blade body 210 and a connecting part 220. The blade bodies 210 of the multiple blades 200 are used to generate power when rotated under drive; the connecting part 220 may be located at one end of the blade 200, and a boss 221 may be provided on the top of the connecting part 220 for connecting with the rocker arm assembly, thereby adjusting the angle of the blade 200.

[0027] Among them, such as Figures 1-5 As shown, the rocker arm 110 may include a handle 111. One end of the handle 111 can be connected to a drive component for adjusting the engine blade 200. The drive component drives the rocker arm 110 to swing, thereby adjusting the angle of the engine blade 200. The other end of the handle 111, i.e., the bottom of one end of the rocker arm 110, may be provided with a longitudinal groove for accommodating a boss 221 on the top of the engine blade 200. The shape of the groove can be adapted to the boss 221 of the blade 200 to cooperate with the boss 221 to drive the blade 200 to rotate. Since the boss 221 needs to be driven by the groove to rotate the blade 200 when the rocker arm 110 rotates, the groove and the boss 221 form a torque. The planar shape of the groove and the boss 221 is generally non-circular, such as semi-circular, racetrack-shaped, or other polygonal shapes. The groove and the boss 221 can interact with each other through their sides extending substantially along a plane to adjust the angle of the blade 200. The groove of the rocker arm 110 can be provided with a first through hole that runs longitudinally through it. The first through hole is mainly used to achieve the positioning and installation of the rocker arm 110 and the blade 200 through the cooperation of the bushing 120, the bolt 130 and the boss 221.

[0028] like Figures 1-5As shown, the bushing 120 can be a hollow cylindrical shape with a second through hole 121 along its longitudinal direction. The bushing 120 passes through the first through hole, and the second through hole 121 is coaxial with the first through hole. The outer surface of the bushing 120 and the inner wall of the first through hole can be in clearance fit. The bushing 120 and the rocker arm 110 are positioned by the clearance fit between the bushing 120 and the first through hole. On the other hand, the lower end of the bushing 120 extends out of the first through hole and is in clearance fit with the inner wall of the connecting hole 222 opened longitudinally from the top surface of the boss 221 of the blade 200. Thus, the bushing 120 achieves radial positioning between the rocker arm 110 and the blade 200. The connecting hole 222 opened in the blade 200 can be a blind hole, extending longitudinally from the top surface of the boss 221 to the connecting part of the blade 200. After the rocker arm assembly and the blade 200 are assembled, the connecting hole 222 is coaxial with the first through hole and the second through hole 121.

[0029] like Figures 2-4 As shown, the stud 130 can be cylindrical in shape, with a first thread at the top and a second thread at the bottom. The middle part of the stud 130, i.e., the position between the first and second threads, can be a smooth rod-shaped surface. Both the first and second threads can be external threads. After assembly, the stud 130 can be inserted through the second through hole 121. The first thread at the top is located above the bushing 120, and the second thread at the bottom passes through the bushing 120 and is located below the bushing 120. The outer surface of the middle part of the stud 130 and the inner surface of the second through hole 121 of the bushing 120 can be clearance-fitted. The stud 130 is threadedly connected to the nut 140 through the first thread. The nut 140 is screwed onto the upper part of the stud 130, and the nut 140 moves downward along the axis by rotation, with its bottom surface abutting against the top surface of the bushing 120, thereby limiting the axial movement of the bushing 120 at the top. The directions such as upward, above, and below mentioned in this disclosure are only for the convenience of illustrating the relative positions between components and are not directional concepts in the Earth's reference system. The second thread of the stud 130 is used for threaded connection with the connecting hole 222 of the blade 200. The connecting hole 222 has a corresponding internal thread that mates with the second thread. The stud 130 can be positioned and connected to the blade 200 via the second thread. The bushing 120 and rocker arm 110 are fitted onto the stud 130 from the inside out, and the bushing 120 is axially tightened by the nut 140. The outer wall of the bushing 120 is clearance-fitted with the inner wall of the rocker arm 110 (i.e., the inner wall of the first through hole), and the inner wall of the bushing 120 (i.e., the inner wall of the second through hole 121) is clearance-fitted with the outer surface of the middle part of the stud 130, forming a secondary positioning. This makes the positioning of the rocker arm 110 and the blade 200 more accurate, avoiding misalignment in the radial direction and improving the reliability of torque transmission by the rocker arm 110.

[0030] In some embodiments, such as Figures 1-5As shown, the top of the bushing 120 may be provided with a shoulder 122 that protrudes radially outward. The shoulder 122 may be annular in shape and extend outward from the top of the bushing 120. The upper surface of the shoulder 122 serves as the top surface of the bushing 120 and abuts against the bottom surface of the nut 140 after the nut 140 is assembled. The outer diameter of the shoulder 122 may be larger than the outer diameter of the nut 140, thereby increasing the contact area when the nut 140 presses against the shoulder 122 of the bushing 120, thus improving the reliability and stability of the abutment, dispersing pressure, reducing pressure, and increasing the service life of the bushing 120. The lower surface of the shoulder 122 can be spaced from the upper surface of the rocker arm 110. When the rocker arm 110 rotates and drives the blade 200 to rotate, the rocker arm 110 drives the blade 200 to rotate through its own groove and the boss 221 of the blade 200. Since there is a gap between the upper surface of the rocker arm 110 and the lower surface of the shoulder 122 of the bushing 120, the rocker arm 110 will occasionally have slight friction with the bushing 120. This friction will not cause the nut 140 to loosen, thereby avoiding the situation where the nut 140 is loosened due to the frictional torque caused by the upper surface of the rocker arm 110 pressing against the nut 140. In addition, it also avoids the wear of the contact surface caused by the friction between the rocker arm 110 and the nut 140. In this embodiment, the bushing 120 is positioned in the axial direction through the structure within the nut 140 and the connecting hole 222. The top surface of the bushing 120 (i.e., the upper surface of the shoulder 122) can abut against the nut 140 to limit the top in the axial direction. The bottom end of the bushing 120 can abut against the stepped surface or other structures within the connecting hole 222 to limit the bottom in the axial direction. The rocker arm 110 is sleeved on the outside of the bushing 120 through the first through hole. The lower surface of the rocker arm 110 abuts against the upper surface of the boss 221, while the upper surface of the rocker arm 110 is spaced apart from the lower surface of the shoulder 122 of the bushing 120 and does not directly contact it. By setting a bushing 120, and leaving a gap between the lower surface of the shoulder 122 of the bushing 120 and the upper surface of the rocker arm 110, the rocker arm 110 only occasionally rubs against the bushing 120 when rotating, thus preventing the nut 140 from loosening, ensuring the reliability of the device, improving the safety of the engine, and avoiding the reduction in service life caused by wear and loosening.

[0031] In some embodiments, the hardness of the bushing 120 can be lower than that of the rocker arm 110, so that when friction occurs between the bushing 120 and the rocker arm 110, the bushing 120 will not cause wear to the rocker arm 110. Once the bushing 120 has worn to a certain extent, only the bushing 120 needs to be replaced, which facilitates maintenance and reduces maintenance costs. In some embodiments, the rocker arm 110 can be made of metal, and the bushing 120 can be made of carbon fiber, polyester, or metal.

[0032] In some embodiments, such as Figure 3As shown, the groove may include two opposing sidewalls 112, with a boss 221 accommodating between the two sidewalls 112. The distance between the two sidewalls 112 is greater than the width of the boss 221. In this embodiment, the groove of the rocker arm 110 may include at least two opposing sidewalls 112. The inner surfaces of the two sidewalls 112 may be planar and parallel to each other. The boss 221 also has two parallel planes corresponding to the two sidewalls 112. In addition to the two opposing sidewalls 112, the groove may also include multiple sidewalls 112, which may be rectangular, parallelogram, hexagonal, etc. The shape of the boss 221 corresponds to the shape of the groove. When the rocker arm 110 rotates in different directions along the axis, the two opposing sidewalls 112 can contact the boss 221 and stably provide torque. The distance between the two sidewalls 112 may be slightly greater than the width of the boss 221, and there may be a gap between the sidewalls 112 and the outer surface of the boss 221 to reduce friction loss.

[0033] In some embodiments, such as Figure 2 As shown, the rocker arm assembly may further include a positioning ring 150, sleeved on the stud 130, for positioning and connecting with the connecting hole 222. In this embodiment, the rocker arm assembly can achieve a more stable positioning connection between the stud 130 and the rocker arm assembly through the positioning ring 150. The inner surface of the positioning ring 150 can be clearance-fitted or interference-fitted with the outer surface of the stud 130, and the outer surface of the positioning ring 150 can be clearance-fitted or interference-fitted with the inner surface of the connecting hole 222. This improves the radial positioning accuracy between the stud 130 and the boss 221, thus ensuring the radial positioning between the rocker arm 110 and the boss 221.

[0034] In some embodiments, when the rocker arm assembly is assembled onto the engine blade 200, the stud 130 can be installed first, and the second thread can be connected to the thread in the connecting hole 222. Then, the positioning ring 150 is fitted onto the stud 130, and can be positioned in the connecting hole 222 by hammering or other means. A stepped surface can be correspondingly provided in the connecting hole 222 to abut against the bottom of the positioning ring 150, thereby limiting the axial movement of the positioning ring 150. After installing the positioning ring 150, the rocker arm 110 can be fitted onto the stud 130, and then the bushing 120 can be fitted onto the stud 130, passing through the lower end of the first through hole of the rocker arm 110 into the connecting hole 222. Then, the nut 140 is connected to the first thread of the stud 130 and tightened, with the lower surface of the nut 140 abutting against the top surface of the bushing 120 and pressing the bushing 120 downwards. The rocker arm assembly in this embodiment of the present disclosure can achieve reliable positioning with the protrusion 221 of the blade 200, which is convenient for installation and ensures that the nut 140 is not loosened during application, thereby improving the stability and reliability of the system and reducing maintenance costs.

[0035] Based on the same inventive concept, such as Figures 1-5 As shown, this disclosure also provides an engine blade 200 assembly, which may include: blade 200, rocker arm 110, bushing 120, stud 130 and nut 140.

[0036] The blade 200 may have an upwardly protruding boss 221 at its top, which cooperates with the rocker arm 110. When the rocker arm 110 rotates, it can transmit torque to the boss 221, thereby driving the blade 200 to rotate. The directions such as upward, above, and below mentioned in this disclosure are for illustrative purposes only and are not directional concepts in the Earth's reference frame. The blade 200 has a connecting hole 222 longitudinally formed from the top of the boss 221. The connecting hole 222 can extend longitudinally from the top surface of the boss 221 to the connecting part of the blade 200, and the axial length of the connecting hole 222 can be greater than the axial height of the boss 221. The connecting hole 222 is mainly used for installation and positioning with components such as the rocker arm 110. An internal thread is provided in the connecting hole 222. The internal thread can be provided near the bottom of the connecting hole 222 and cooperates with the second thread provided at the bottom of the stud 130, so that the stud 130 is connected to the blade 200.

[0037] The rocker arm 110 may include a handle 111, one end of which can be connected to a drive component for adjusting the engine blade 200. The drive component drives the rocker arm 110 to swing, thereby adjusting the angle of the engine blade 200. The other end of the handle 111, i.e., the bottom of one end of the rocker arm 110, may be provided with a longitudinal groove to accommodate a boss 221 on the top of the engine blade 200. The shape of the groove can be adapted to the boss 221 of the blade 200, cooperating with the boss 221 to drive the blade 200 to rotate. Since the boss 221 needs to be driven by the groove to rotate the blade 200 when the rocker arm 110 rotates, the groove and the boss 221 generate a torque. The planar shape of the groove and the boss 221 is generally non-circular, such as semi-circular, racetrack-shaped, or other polygonal. The groove and the boss 221 can interact through their sides, which are essentially extending from a single plane, to adjust the angle of the blade 200. The groove of the rocker arm 110 can be provided with a first through hole that runs longitudinally through and is coaxial with the connecting hole 222. The first through hole can cooperate with the bushing 120, the stud 130 and the boss 221 to realize the positioning and installation of the rocker arm 110 and the blade 200.

[0038] The bushing 120 can be a hollow cylindrical shape with a second through hole 121 along its longitudinal direction. The bushing 120 passes through the first through hole, and the second through hole 121 is coaxial with the first through hole. The outer surface of the bushing 120 and the inner wall of the first through hole can be clearance-fitted. The clearance fit between the bushing 120 and the first through hole of the rocker arm 110 achieves positioning of the two. On the other hand, the lower end of the bushing 120 protrudes from the first through hole and also has a clearance fit with the inner wall of the connecting hole 222. Thus, the bushing 120 achieves radial positioning between the rocker arm 110 and the blade 200. After the rocker arm assembly and the blade 200 are assembled, the connecting hole 222, the first through hole, and the second through hole 121 are basically coaxial.

[0039] The stud 130 can be cylindrical in shape, with a first thread at the top and a second thread at the bottom. The middle part of the stud 130, i.e., the position between the first and second threads, can be a smooth rod-shaped surface. Both the first and second threads can be external threads. After assembly, the stud 130 can be inserted through the second through hole 121. The first thread at the top is located above the bushing 120, and the second thread at the bottom passes through the bushing 120, is located below the bushing 120, and extends into the connecting hole 222 to connect with the internal thread inside the connecting hole 222. The outer surface of the middle part of the stud 130 and the inner surface of the second through hole 121 of the bushing 120 can be clearance fitted. The stud 130 is threaded to the nut 140 through the first thread. The nut 140 is screwed onto the upper part of the stud 130, and the nut 140 moves downward along the axis by rotation, with its bottom surface abutting against the top surface of the bushing 120, thereby limiting the axial movement of the bushing 120 at the top. The stud 130 can be positioned and connected to the blade 200 via a second thread. The bushing 120 and the rocker arm 110 are fitted onto the stud 130 from the inside out, and the bushing 120 is tightened axially by the nut 140. The outer wall of the bushing 120 is clearance-fitted with the inner wall of the rocker arm 110 (i.e., the inner wall of the first through hole), and the inner wall of the bushing 120 (i.e., the inner wall of the second through hole 121) is clearance-fitted with the outer surface of the middle part of the stud 130, forming a secondary positioning, which makes the positioning of the rocker arm 110 and the blade 200 more accurate, avoids misalignment in the radial direction, and improves the reliability of the rocker arm 110 in transmitting torque.

[0040] In some embodiments, such as Figure 2As shown, the groove may include two opposing sidewalls 112, with a boss 221 accommodating between the two sidewalls 112. The distance between the two sidewalls 112 is greater than the width of the boss 221. In this embodiment, the groove of the rocker arm 110 may include at least two opposing sidewalls 112. The inner surfaces of the two sidewalls 112 may be planar and parallel to each other. The boss 221 also has two parallel planes corresponding to the two sidewalls 112. In addition to the two opposing sidewalls 112, the groove may also include multiple sidewalls 112, which may be rectangular, parallelogram, hexagonal, etc. The boss 221 corresponds to the shape of the groove. When the rocker arm 110 rotates in different directions along the axis, the two opposing sidewalls 112 can contact the boss 221 and stably provide torque. The distance between the two sidewalls 112 may be slightly greater than the width of the boss 221, and there may be a gap between the outer surfaces of the sidewalls 112 and the boss 221 to reduce friction loss.

[0041] In some embodiments, such as Figure 6As shown, a first stepped surface 223 can be provided inside the connecting hole 222. The first stepped surface 223 extends radially, and its upper surface abuts against the bottom end of the bushing 120. The first stepped surface 223 can limit the bottom end of the bushing 120 in the axial direction. The top end of the bushing 120 is provided with a shoulder 122 that protrudes radially outward. The shoulder 122 can be annular in shape and extend outward from the top end of the bushing 120. The upper surface of the shoulder 122 serves as the top surface of the bushing 120, abutting against the bottom surface of the nut 140 after assembly. The outer diameter of the shoulder 122 can be larger than the outer diameter of the nut 140, thereby increasing the contact area when the nut 140 presses against the shoulder 122 of the bushing 120, improving the reliability and stability of the contact, dispersing pressure, reducing pressure intensity, and extending the service life of the bushing 120. The upper surface of the shoulder 122 abuts against the bottom surface of the nut 140, allowing the nut 140 to limit the top of the bushing 120 in the axial direction. The nut 140 is then tightened by rotating along the first thread of the stud 130, pressing the bushing 120 downwards, thus fixing the bushing 120 axially between the nut 140 and the first stepped surface 223. The lower surface of the shoulder 122 can be spaced apart from the upper surface of the rocker arm 110. When the rocker arm 110 rotates and drives the blade 200 to rotate, the rocker arm 110 drives the blade 200 to rotate through its own groove and the boss 221 of the blade 200. Since there is a gap between the upper surface of the rocker arm 110 and the lower surface of the shoulder 122 of the bushing 120, the rocker arm 110 will occasionally have slight friction with the bushing 120. This friction will not cause the nut 140 to loosen, thus avoiding the situation where the nut 140 is loosened due to the frictional torque caused by the upper surface of the rocker arm 110 pressing against the nut 140. In addition, it also avoids the wear of the contact surface caused by the friction between the rocker arm 110 and the nut 140. In this embodiment, the bushing 120 is positioned axially via the nut 140 and the first stepped surface 223 within the connecting hole 222. The rocker arm 110 is sleeved onto the outside of the bushing 120 through the first through hole. The lower surface of the rocker arm 110 abuts against the upper surface of the boss 221, while the upper surface of the rocker arm 110 is spaced apart from the lower surface of the shoulder 122 of the bushing 120, preventing direct contact. By providing the bushing 120 and maintaining a gap between the lower surface of the shoulder 122 of the bushing 120 and the upper surface of the rocker arm 110, the rocker arm 110 only occasionally rubs against the bushing 120 during rotation. This prevents the nut 140 from loosening, ensuring the reliability of the device, improving engine safety, and avoiding reduced service life due to wear and loosening.

[0042] In some embodiments, the hardness of the bushing 120 can be lower than that of the rocker arm 110, so that when friction occurs between the bushing 120 and the rocker arm 110, the bushing 120 will not cause wear to the rocker arm 110. Once the bushing 120 has worn to a certain extent, only the bushing 120 needs to be replaced, which facilitates maintenance and reduces maintenance costs. In some embodiments, the rocker arm 110 can be made of metal, and the bushing 120 can be made of carbon fiber, polyester, or metal.

[0043] In some embodiments, such as Figure 6 As shown, a second stepped surface 224 can be provided within the connecting hole 222. The second stepped surface 224 can be located below the first stepped surface 223 in the axial direction, that is, farther away from the boss 221 than the first stepped surface 223. The engine blade 200 assembly may also include a positioning ring 150, sleeved on the stud 130, with its lower end face abutting against the second stepped surface 224. In this embodiment, the rocker arm assembly can achieve a more stable positioning connection to the stud 130 through the positioning ring 150. The inner surface of the positioning ring 150 can be clearance-fitted or interference-fitted with the outer surface of the stud 130, and the outer surface of the positioning ring 150 can be clearance-fitted or interference-fitted with the inner surface of the connecting hole 222. This improves the radial positioning accuracy between the stud 130 and the boss 221, thus ensuring the radial positioning between the rocker arm 110 and the boss 221. In some embodiments, the positioning ring 150 and the stud 130 are integrally formed or interference-fitted.

[0044] In some embodiments, during the assembly of the engine blade 200 assembly, the stud 130 can be installed first, and connected to the thread in the connecting hole 222 via the second thread. Then, the positioning ring 150 is fitted onto the stud 130, and can be positioned in the connecting hole 222 by hammering or other means. A stepped surface can be correspondingly provided in the connecting hole 222 to abut against the bottom of the positioning ring 150, thereby limiting the axial movement of the positioning ring 150. After installing the positioning ring 150, the rocker arm 110 can be fitted onto the stud 130, and then the bushing 120 can be fitted onto the stud 130, passing through the lower end of the first through hole of the rocker arm 110 into the connecting hole 222. Then, the nut 140 is connected to the first thread of the stud 130 and tightened, with the lower surface of the nut 140 abutting against the top surface of the bushing 120 and pressing the bushing 120 downwards. The rocker arm assembly in this embodiment of the present disclosure can achieve reliable positioning with the protrusion 221 of the blade 200, which is convenient for installation and ensures that the nut 140 is not loosened during application, thereby improving the stability and reliability of the system and reducing maintenance costs.

[0045] This application uses specific terms to describe embodiments of the application. Terms such as "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic associated with at least one embodiment of the application. Therefore, it should be emphasized and noted that references to "an embodiment," "one embodiment," or "an alternative embodiment" in different locations throughout this specification do not necessarily refer to the same embodiment. Furthermore, certain features, structures, or characteristics in one or more embodiments of the application can be appropriately combined.

[0046] In the context of this application, unless the context clearly indicates otherwise, the words "a," "an," "an," and / or "the" do not specifically refer to the singular and may also include the plural. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of explicitly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements.

[0047] Similarly, it should be noted that, in order to simplify the description of the present application and thus aid in the understanding of one or more embodiments, the foregoing description of the embodiments of the present application sometimes combines multiple features into a single embodiment, drawing, or description thereof. However, this disclosure method does not imply that the subject matter of the present application requires more features than those mentioned in the claims. In fact, the embodiments contain fewer features than all the features of the single embodiments disclosed above.

[0048] The basic concepts have been described above. Obviously, for those skilled in the art, the above disclosure is merely illustrative and does not constitute a limitation of this application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and corrections to this application. Such modifications, improvements, and corrections are suggested in this application, and therefore remain within the spirit and scope of the embodiments of this application.

Claims

1. A rocker arm assembly for adjusting the angle of engine blades, comprising: The rocker arm has a groove at one end of its bottom for accommodating a boss of the blade. The groove has a longitudinal first through hole. The groove is used to cooperate with the boss to drive the blade to rotate. The groove includes two opposing sidewalls. The two sidewalls are used to accommodate the boss. The distance between the two sidewalls is greater than the width of the boss. The bushing has a second through hole coaxial with the first through hole. The bushing passes through the first through hole and is clearance-fitted with the inner wall of the first through hole. The lower end of the bushing protrudes from the first through hole and is clearance-fitted with the inner wall of the connecting hole opened longitudinally on the top surface of the boss. The stud has a first thread at the top and a second thread at the bottom, and is disposed through the second through hole. The second thread is used to connect with the threaded connection of the blade in the connecting hole longitudinally opened from the top of the boss. The nut is connected to the first thread of the stud, and its bottom surface abuts against the top surface of the bushing; The bushing has a shoulder that protrudes radially outward at its top end. The upper surface of the shoulder serves as the top surface of the bushing and abuts against the bottom surface of the nut. The lower surface of the shoulder is spaced apart from the upper surface of the rocker arm.

2. The rocker assembly for adjusting the engine vane angle according to claim 1, wherein, The hardness of the bushing is lower than that of the rocker arm.

3. The rocker assembly for adjusting the angle of engine vane according to claim 1, wherein, The rocker arm assembly also includes: A positioning ring is fitted onto the stud and used for positioning and connecting with the connecting hole.

4. The rocker assembly for adjusting the angle of engine vane according to claim 3, wherein, The positioning ring is integrally formed with or press-fitted with the stud.

5. An engine blade assembly, comprising: The blade has a boss at the top, and a connecting hole is longitudinally opened from the top of the boss. The connecting hole is provided with an internal thread. The rocker arm has a groove at one end of its bottom, which accommodates the boss. The inner wall of the groove is used to cooperate with the boss to drive the blade to rotate. The groove has a first through hole coaxial with the connecting hole. The groove includes two opposing sidewalls, and the boss is accommodated between the two sidewalls. The distance between the two sidewalls is greater than the width of the boss. A bushing is provided with a second through hole coaxial with the first through hole. The bushing is disposed through the first through hole, and the lower end of the bushing protrudes out of the first through hole. The bushing is clearance-fitted with the inner wall of the first through hole and the inner wall of the connecting hole. The stud has a first thread at the top and a second thread at the bottom, passes through the second through hole and extends into the connecting hole, and the second thread is connected to the internal thread in the connecting hole; The nut is connected to the first thread, and its bottom surface abuts against the top surface of the bushing; The connecting hole has a first stepped surface that abuts against the bottom end of the bushing. The bushing has a shoulder that protrudes radially outward at its top end. The upper surface of the shoulder serves as the top surface of the bushing and abuts against the bottom surface of the nut. The lower surface of the shoulder is spaced apart from the upper surface of the rocker arm.

6. The engine vane assembly of claim 5, wherein, A second stepped surface is provided inside the connecting hole; The engine blade assembly further includes a positioning ring, which is sleeved on the stud and whose lower end face abuts against the second stepped surface.

Images