An anti-torsion arm structure of an automatic tilter torque arm

Abstract

The present invention belongs to the technical field of helicopter rotor systems and discloses an automatic tilter torque arm anti-torsion arm structure, comprising a rotating shaft assembly, a rod assembly, and a spherical bearing. One end of the rotating shaft assembly is a rotating shaft, and the other end is connected to the rod assembly. The rod assembly is provided with a light rod, and the spherical bearing can be tilted and moved up and down and sleeved on the light rod of the rod assembly. When used as an anti-torsion arm, the rotating shaft assembly is rotatably connected to the casing, and the outer ring of the spherical bearing is fixedly connected to the fixed ring assembly. When used as a torque arm, the rotating shaft assembly is rotatably connected to the rotor shaft, and the outer ring of the spherical bearing is fixedly connected to the dynamic ring assembly. The present invention functionally realizes the role of an automatic tilter anti-torsion arm / torsion arm, simplifies the structural composition of the anti-torsion arm assembly / torsion arm assembly, greatly reduces the weight of the assembly, and eliminates the influence of space limitations on the typical configuration torque arm anti-torsion arm structure.

Description

Technical Field

[0001] The invention belongs to the technical field of helicopter rotor systems, and relates to a structural design of an automatic tilt device of a helicopter rotor system, and in particular to an anti-torsion arm structure of a torque arm of the automatic tilt device. Background Art

[0002] The automatic tilter is an important component of the helicopter rotor system. Its main function is to transmit the collective pitch and cyclic pitch control inputs from the servo to the rotor blades to achieve changes in the blade attack angle, thereby controlling the size and direction of the rotor lift and achieving attitude control of the helicopter.

[0003] A typical automatic tilt mechanism consists of a rotating ring assembly, a stationary ring assembly, a torque arm assembly, an anti-torque arm assembly, and a tie rod assembly. The torque arm assembly is connected to the rotor shaft at one end and to the rotating ring assembly at the other. Rotating the rotor shaft drives the rotating ring. The anti-torque arm assembly is connected to the fixed end of the main reducer at one end and to the stationary ring assembly at the other. Its primary function is to prevent the stationary ring assembly from rotating with the rotating ring assembly.

[0004] A typical anti-torsion arm assembly primarily consists of an anti-torsion arm yoke, a square arm assembly, and a rotating shaft formed by two pairs of bolts and bushings. The yoke is connected to the stationary ring assembly via a spherical bearing, the square arm assembly is connected to the main reducer's fixed end via a rotating shaft, and the yoke is connected to the square arm assembly via a rotating shaft. During the collective pitch and cyclic motion of the automatic tilt mechanism, relative swinging motion occurs between the anti-torsion arm yoke and the stationary ring assembly, the square arm assembly and the main reducer's fixed end, and the square arm assembly and the yoke.

[0005] A typical torque arm assembly consists primarily of a torque arm yoke, a square arm, and a rotating shaft formed by two pairs of bolt bushings. The yoke is connected to the rotating ring assembly via a spherical bearing, the square arm assembly is connected to the rotor shaft via a rotating shaft, and the yoke and square arm assembly are connected via a rotating shaft. During the collective pitch and cyclic motion of the automatic tilt mechanism, relative oscillation occurs between the torque arm yoke and the rotating ring assembly, the square arm assembly and the rotor shaft, and the square arm assembly and the yoke.

[0006] A typical automatic tilt mechanism is installed above the main reducer, and the design of the torque arm anti-torsion arm assembly and the rotor shaft / main reducer connection point is relatively simple. However, if the automatic tilt mechanism is installed below the main reducer and the space below is limited, the design of the torque arm anti-torsion arm structure and the rotor shaft / main reducer connection of the typical configuration will be difficult, and the limited space cannot meet the design requirements. Summary of the Invention

[0007] In order to solve the above problems, the present invention proposes an anti-torsion arm structure of an automatic recliner torque arm, which simplifies the structures of the anti-torsion arm assembly and the torque arm assembly and greatly reduces the weight of the assembly.

[0008] The technical solution of the present invention:

[0009] An automatic tilter torque arm anti-torsion arm structure includes a rotating shaft assembly, a rod assembly and a joint bearing. One end of the rotating shaft assembly is a rotating shaft, and the other end is connected to the rod assembly. The rod assembly is provided with a polished rod, and the joint bearing is sleeved on the polished rod of the rod assembly so as to be tiltable and movable up and down. When used as an anti-torsion arm, the rotating shaft assembly is rotatably connected to the casing, and the outer ring of the joint bearing is fixedly connected to the stationary ring assembly. When used as a torque arm, the rotating shaft assembly is rotatably connected to the rotor shaft, and the outer ring of the joint bearing is fixedly connected to the dynamic ring assembly.

[0010] Furthermore, when used as an anti-torsion arm, the rod body assembly becomes an anti-torsion rod assembly, which is connected to the main reducer on the receiver through the rotating shaft assembly; the joint bearing is installed on the stationary ring assembly, and the light rod part of the anti-torsion rod assembly is inserted into the inner hole of the joint bearing. The joint bearing can slide along the axis of the light rod and swing around its own spherical center with a certain amplitude; the screw plug is installed in the anti-torsion rod assembly.

[0011] Furthermore, when used as a torque arm, the rod body assembly becomes a rotating rod assembly, which is connected to the rotor shaft through the rotating shaft assembly and rotates with the rotor shaft; the joint bearing is installed on the dynamic ring assembly, and the light rod part of the anti-torsion rod assembly is inserted into the inner hole of the joint bearing. The joint bearing can slide along the axis of the light rod and swing around its own spherical center with a certain amplitude; the screw plug is installed in the anti-torsion rod assembly.

[0012] Furthermore, the rotating shaft assembly includes a bolt, a wear-resistant washer, a wear-resistant boss bushing, a wear-resistant straight bushing and a nut. The end of the rod body assembly is an ear structure, and the bolt passes through the rotating shaft hole of the ear structure; wherein, a wear-resistant washer is covered under the nut of the bolt, and a wear-resistant boss bushing is provided in the rotating shaft hole of the rod body assembly, the boss is provided on the outside of the rotating shaft hole, and a wear-resistant straight bushing is provided in the section of the bolt provided in the rotating shaft hole. The nut is screwed on the other end of the bolt, and a wear-resistant washer is also provided between the bolt and the ear.

[0013] Furthermore, there is a certain gap between the end face of the wear-resistant shoulder bushing and the end face of the wear-resistant washer.

[0014] Furthermore, the rod assembly includes a rod body and a transition section, wherein the rod body is a polished rod structure, which is made of structural steel material and the surface of the rod body is smoothed; one end of the transition section is provided with an ear structure, and the other end is the rod body.

[0015] Furthermore, the smooth surface treatment is specifically bonding a PTFE self-lubricating liner.

[0016] Furthermore, it also includes an anti-collision bushing, which is sleeved at the connection between the rod body and the transition section; wherein the anti-collision bushing and the screw plug are made of special polymer material polyetheretherketone PEEK.

[0017] Furthermore, the spherical bearing is mounted on the stationary ring assembly or the dynamic ring assembly through a flange; wherein, the outer ring of the spherical bearing is mounted on the flange by interference fit, and the spherical bearing is positioned with the stationary ring assembly or the dynamic ring assembly through the outer circle and end face of the flange.

[0018] Beneficial effects of the present invention:

[0019] 1. The anti-torsion arm structure design of the automatic recliner torque arm of the present invention functionally realizes the function of the anti-torsion arm / torsion arm of the automatic recliner;

[0020] 2. The anti-torsion arm structural design of the automatic recliner torque arm described in the present invention simplifies the structural composition of the anti-torsion arm assembly / torsion arm assembly, greatly reducing the weight of the assembly.

[0021] 3. The design of the torque arm and anti-torsion arm structure of an automatic recliner described in the present invention adapts to the installation environment of the new automatic recliner and eliminates the influence of space limitations on the torque arm and anti-torsion arm structure of the typical configuration. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a typical installation diagram of the torque arm and anti-torsion arm of an automatic tilter;

[0023] Figure 2 This is a schematic diagram of the composition of a typical automatic tilter torque arm and anti-torsion arm;

[0024] Figure 3 This is a schematic diagram of the composition of the new torque arm assembly / anti-torsion arm assembly;

[0025] Figure 4 This is a schematic diagram of the installation of the new anti-torsion arm assembly;

[0026] Figure 5 This is a schematic diagram of the movement of the new anti-torsion arm assembly during the collective movement of the automatic tilt mechanism;

[0027] Figure 6 This is a schematic diagram of the movement of the new anti-torsion arm assembly during the cyclic pitch-changing movement of the automatic tilter;

[0028] Figure 7 It is a schematic diagram of the shaft composition;

[0029] Figure 8 It is a schematic diagram of the anti-torsion bar assembly;

[0030] Figure 9 This is a schematic diagram of the installation of the spherical bearing of the new anti-torsion arm assembly;

[0031] Among them, 1—torque arm assembly, 2—anti-torsion arm assembly, 3—spherical bearing, 4—triangular arm assembly, 5—rotating shaft, 6—square arm assembly, 7—rotating shaft assembly, 8—rod assembly, 9—spherical bearing, 10—screw plug, 11—main reducer, 12—stationary ring assembly, 13—bolt, 14—wear-resistant washer, 15—wear-resistant boss bushing, 16—wear-resistant straight bushing, 17—nut, 18—anti-collision bushing, 19—rod, 20—PTFE self-lubricating gasket, 21—flange, 22—nut, 23—bolt, 24—gasket. DETAILED DESCRIPTION

[0032] This section is an embodiment of the present invention, which is used to explain and illustrate the technical solution of the present invention. In the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0033] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate directions or positional relationships for the purposes of the accompanying drawings, and are intended only to facilitate the description of the present invention and simplify the description, rather than to indicate or imply that the device or case referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention. In addition, the terms "first", "second" and the like are used for descriptive purposes only, and should not be understood as indicating or implying relative importance or implying the number of technical features indicated. Thus, features defined as "first", "second" and the like may explicitly or implicitly include more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0034] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be interpreted broadly. For example, they may refer to fixed, detachable, or integrated connections; mechanical or point connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0035] A torque arm anti-torque arm structure for an automatic tilt mechanism includes a rotating shaft assembly 7, a rod assembly 8 and a joint bearing 9. One end of the rotating shaft assembly 7 is a rotating shaft, and the other end is connected to the rod assembly 8. The rod assembly 8 is provided with a polished rod, and the joint bearing 9 is sleeved on the polished rod of the rod assembly 8 so as to be tiltable and movable up and down. When used as an anti-torque arm, the rotating shaft assembly 7 is rotatably connected to the casing, and the outer ring of the joint bearing 9 is fixedly connected to the stationary ring assembly 12. When used as a torque arm, the rotating shaft assembly 7 is rotatably connected to the rotor shaft, and the outer ring of the joint bearing 9 is fixedly connected to the dynamic ring assembly.

[0036] When used as an anti-torsion arm, the rod body assembly 8 becomes the anti-torsion rod assembly 8, which is connected to the main reducer 11 on the receiver through the rotating shaft assembly 7; the joint bearing 9 is installed on the fixed ring assembly 12, and the light rod part of the anti-torsion rod assembly 8 is inserted into the inner hole of the joint bearing 9. The joint bearing 9 can slide along the axis of the light rod and swing around its own spherical center with a certain amplitude; the screw plug 10 is installed in the anti-torsion rod assembly 8.

[0037] When used as a torque arm, the rod body assembly 8 becomes a rotating rod assembly 8, which is connected to the rotor shaft through the rotating shaft assembly 7 and rotates with the rotor shaft; the joint bearing 9 is installed on the dynamic ring assembly, and the light rod part of the anti-torsion rod assembly 8 is inserted into the inner hole of the joint bearing 9. The joint bearing 9 can slide along the axis of the light rod and swing around its own spherical center with a certain amplitude; the screw plug 10 is installed in the anti-torsion rod assembly 8.

[0038] The rotating shaft assembly 7 includes a bolt 13, a wear-resistant washer 14, a wear-resistant boss bushing 15, a wear-resistant straight bushing 16 and a nut 17. The end of the rod body assembly 8 is an ear structure, and the bolt 13 passes through the rotating shaft hole of the ear structure; wherein, a wear-resistant washer 14 is covered under the nut of the bolt 13, and a wear-resistant boss bushing 15 is provided in the rotating shaft hole of the rod body assembly 8, and the boss is provided on the outside of the rotating shaft hole. The bolt 13 is provided in the section of the rotating shaft hole with a wear-resistant straight bushing 16, and the nut 17 is screwed on the other end of the bolt 13, and a wear-resistant washer 14 is also provided between the bolt 13 and the ear.

[0039] There is a certain gap between the end surface of the wear-resistant shoulder bushing 15 and the end surface of the wear-resistant washer 14.

[0040] The rod assembly 8 includes a rod 19 and a transition section, wherein the rod 19 is a polished rod structure made of structural steel material, and the surface of the rod 19 is smoothed; an ear structure is provided at one end of the transition section, and the other end is the rod 19.

[0041] The smooth surface treatment is specifically to bond the PTFE self-lubricating liner 20 .

[0042] It also includes an anti-collision bushing 18, which is sleeved on the connection between the rod body 19 and the transition section; wherein the anti-collision bushing 18 and the screw plug 10 are made of special polymer material polyetheretherketone PEEK.

[0043] The spherical bearing 9 is mounted on the stationary ring assembly 12 or the dynamic ring assembly through a flange 21; wherein, the outer ring of the spherical bearing 9 is mounted on the flange 21 by interference fit, and the spherical bearing 9 is positioned with the stationary ring assembly 12 or the dynamic ring assembly through the outer circle and end face of the flange 21.

[0044] The following is another embodiment of the present invention.

[0045] The invention discloses an automatic tilt mechanism torque arm anti-torsion arm structure design, which is mainly composed of a rotating shaft assembly 7, an anti-torsion rod / rotating rod assembly 8 and a joint bearing 9. Figure 3 shown.

[0046] The installation diagram of the anti-torsion arm structure of the automatic tilter of the present invention is as follows: Figure 4 As shown, the anti-torsion bar assembly 8 is connected to the main reducer 11 through the rotating shaft assembly 7. The anti-torsion bar assembly 8 can swing around the axis of the rotating shaft assembly 7, and can also perform limited small-amplitude translational sliding along the axis of the rotating shaft assembly 7; the joint bearing 9 is installed on the fixed ring assembly 12, and the light rod part of the anti-torsion bar assembly 8 is inserted into the inner hole of the joint bearing 9. The joint bearing 9 can slide along the axis of the light rod and swing around its own sphere center with a certain amplitude; the screw plug 10 is installed in the anti-torsion bar assembly 8 to prevent the joint bearing 9 from falling out.

[0047] When the automatic tilt mechanism performs collective pitch change motion, the fixed ring assembly 12 slides up and down along the rotor shaft. At this time, the spherical plain bearing 9 installed on the fixed ring assembly 12 slides on the polished rod of the anti-torsion bar assembly 8 and swings around the rotating shaft assembly 7 with the anti-torsion bar assembly 8. At this time, the inner and outer rings of the spherical plain bearing 9 swing relative to each other around their own spherical centers. Figure 5 As shown; when the automatic tilt mechanism performs periodic pitch-changing motion, the fixed ring assembly 12 tilts around the large ball joint assembly. At this time, the joint bearing 9 installed on the fixed ring assembly 12 also tilts and slides on the polished rod of the anti-torsion bar assembly 8, and swings around the rotating shaft assembly 7 with the anti-torsion bar assembly 8. At this time, there is relative swing between the inner and outer rings of the joint bearing 9 around their own spherical centers, as shown in FIG. Figure 6 The screw plug 10 is installed on the anti-torsion bar assembly 8 to prevent the spherical bearing 9 from falling out when sliding on the polished rod of the anti-torsion bar assembly 8.

[0048] The automatic tilting device anti-twist bar shaft assembly 7 of the present invention is mainly composed of a bolt 13, a wear-resistant washer 14, a wear-resistant shoulder bushing 15, a wear-resistant straight bushing 16 and a nut 17. Figure 7As shown, the bolt 13 compresses the wear-resistant washer 14, the wear-resistant straight bushing 16, the fork ear of the main reducer 11, the wear-resistant straight bushing 16, and the wear-resistant washer 14, and is tightened with the nut; the wear-resistant boss bushing 15 is installed on the fork ear of the anti-torsion bar assembly 8, and a certain gap is left between the end face of the wear-resistant boss bushing 15 and the end face of the wear-resistant washer 14.

[0049] The automatic tilter anti-twist bar assembly 8 of the present invention is mainly composed of a rod body 19, an anti-collision bushing 18, a wear-resistant shoulder bushing 15 and a screw plug 10. Figure 8 As shown, the rod body 19 is made of structural steel, primarily for bearing tangential loads. Its polished rod surface undergoes special surface treatment, such as bonding a PTFE self-lubricating liner 20 to improve the rod body's wear resistance and reduce friction generated when the polished rod and bearing 9 slide relative to each other. The anti-collision bushing 18 and screw plug 10 are made of the special polymer material polyetheretherketone (PEEK) to prevent damage to the anti-torsion rod body 19 and the spherical plain bearing 9 during excessive manipulation of the fixed ring assembly 12. The wear-resistant shoulder bushing 15 is connected to the rod body 19 with a fork ear using an interference fit.

[0050] The present invention relates to an automatic tilt anti-twist bar, wherein the joint bearing 9 is mounted on the fixed ring assembly 12 via a flange 21. Figure 9 As shown, the spherical plain bearing 9 is installed on the flange 21 by interference fit. The flange 21 has through holes on both sides and is mounted on the fixed ring assembly 12 using two sets of bolts 23, washers 24, and nuts 22. The bearing 9 is positioned with the fixed ring assembly 12 by the outer diameter and end surface of the flange 21.

[0051] The anti-twist bar of an automatic recliner shown in this invention can also be used in the structural design of an automatic recliner torque arm assembly, and similarly comprises a rotating shaft assembly 7, a rotating rod assembly 8, and a spherical bearing 9. The spherical bearing 9 is mounted on the dynamic ring assembly, and the rotating rod assembly 8 is mounted on the rotor shaft via the rotating shaft assembly 7. Under the action of the rotor shaft and the rotating shaft assembly 7, the rotating rod assembly 8 drives the dynamic ring assembly to rotate synchronously.

[0052] 1. The key point of the present invention is that the movement function of the anti-torsion arm assembly is achieved by replacing the swinging motion between the triangular arm and the square arm of the typical structure through the sliding motion between the spherical bearing 9 mounted on the fixed ring assembly and the anti-torsion bar assembly 8, the swinging of the anti-torsion bar assembly 8 around the rotating shaft assembly 7, and the swinging of the spherical bearing 9 around its own spherical center, thereby greatly simplifying the structure.

[0053] 2. Another key point of the present invention is that the screw plug 10 is designed to be installed on the anti-twist rod body 19 to prevent the fixed ring assembly 12 from falling out when sliding;

[0054] 3. Another key point of the present invention is to use a special polymer material, polyetheretherketone (PEEK), to manufacture the anti-collision bushing 18 and the screw plug 10 to prevent the stationary ring assembly 12 from damaging the anti-torsion bar 19 and the bearing 9 when being over-operated;

[0055] 4. Another key point of the present invention is that the shaft assembly 7 is composed of two sets of wear-resistant shoulder bushings, wear-resistant straight bushings and wear-resistant washers to reduce the swing torque and improve the swing flexibility and performance;

[0056] 5. Another key point of the present invention is that the polished rod surface of the rod body 19 is specially surface treated, such as bonding a PTFE self-lubricating liner 20 to improve the wear resistance of the rod body and reduce the friction generated when the polished rod and the bearing 9 slide relative to each other.

[0057] The above description is merely a detailed description of specific embodiments of the present invention. Any unspecified portions are conventional techniques. However, the scope of the present invention is not limited thereto. Any changes or substitutions that can be readily conceived by a person skilled in the art within the technical scope disclosed in the present invention are intended to be encompassed within the scope of the present invention. The scope of the present invention shall be determined by the scope of the claims.

Claims

1. An anti-torsion arm structure of an automatic tilting device torque arm, characterized in that: The invention comprises a rotating shaft assembly (7), a rod assembly (8) and a joint bearing (9), wherein one end of the rotating shaft assembly (7) is a rotating shaft and the other end is connected to the rod assembly (8), a light rod is provided on the rod assembly (8), and the joint bearing (9) is sleeved on the light rod of the rod assembly (8) so as to be tiltable and movable up and down; when used as an anti-torsion arm, the rotating shaft assembly (7) is rotatably connected to the casing, and the outer ring of the joint bearing (9) is fixedly connected to the stationary ring assembly (12); when used as a torsion arm, the rotating shaft assembly (7) is rotatably connected to the rotor shaft, and the outer ring of the joint bearing (9) is fixedly connected to the dynamic ring assembly; When used as an anti-torsion arm, the rod body assembly (8) becomes an anti-torsion rod assembly, and the anti-torsion rod assembly is connected to the main reducer (11) on the casing through the rotating shaft assembly (7); the joint bearing (9) is installed on the fixed ring assembly (12), and the smooth rod portion of the anti-torsion rod assembly is inserted into the inner hole of the joint bearing (9), and the joint bearing (9) can slide along the axis of the smooth rod and swing around its own sphere center with a certain amplitude; the screw plug (10) is installed in the anti-torsion rod assembly; When used as a torque arm, the rod body assembly (8) becomes a rotating rod assembly, which is connected to the rotor shaft through the rotating shaft assembly (7) and rotates with the rotor shaft; the joint bearing (9) is installed on the dynamic ring assembly, and the light rod portion of the anti-rotating rod assembly is inserted into the inner hole of the joint bearing (9), and the joint bearing (9) can slide along the axis of the light rod and swing around its own sphere center with a certain amplitude; the screw plug (10) is installed in the rotating rod assembly; The spherical bearing (9) is mounted on the fixed ring assembly (12) or the dynamic ring assembly through a flange (21); wherein the outer ring of the spherical bearing (9) is mounted on the flange (21) by interference fit, and the spherical bearing (9) is positioned with the fixed ring assembly (12) or the dynamic ring assembly through the outer circle and end face of the flange (21).

2. The anti-torsion arm structure of the torque arm of the automatic recliner according to claim 1, characterized in that: The rotating shaft assembly (7) comprises a bolt (13), a wear-resistant washer (14), a wear-resistant shoulder bushing (15), a wear-resistant straight bushing (16) and a nut (17). The end of the rod assembly (8) is an ear structure, and the bolt (13) passes through the rotating shaft hole of the ear structure; wherein, a wear-resistant washer (14) is sleeved under the nut of the bolt (13), a wear-resistant shoulder bushing (15) is provided in the rotating shaft hole of the rod assembly (8), the shoulder is provided outside the rotating shaft hole, the bolt (13) is provided in the section of the rotating shaft hole with a wear-resistant straight bushing (16), the nut (17) is screwed on the other end of the bolt (13), and a wear-resistant washer (14) is also provided between the bolt (13) and the ear.

3. The anti-torsion arm structure of the torque arm of the automatic recliner according to claim 2, characterized in that: There is a certain gap between the end face of the wear-resistant shoulder bushing (15) and the end face of the wear-resistant washer (14).

4. The anti-torsion arm structure of the torque arm of an automatic recliner according to claim 1, characterized in that: The rod assembly (8) comprises a rod (19) and a transition section, wherein the rod (19) is a polished rod structure made of structural steel, and the surface of the rod (19) is smoothed; one end of the transition section is provided with an ear structure, and the other end is the rod (19).

5. The anti-torsion arm structure of the torque arm of the automatic recliner according to claim 4, characterized in that: The smooth surface treatment is specifically to bond a PTFE self-lubricating liner (20).

6. The anti-torsion arm structure of the torque arm of an automatic recliner according to claim 4, characterized in that: It also includes an anti-collision bushing (18), which is sleeved at the connection between the rod body (19) and the transition section; wherein the anti-collision bushing (18) and the screw plug (10) are made of a special polymer material polyetheretherketone (PEEK).

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