阅读说明：本技术 一种起落架侧撑杆机构 (Side stay bar mechanism of landing gear ) 是由 张剑剑 张国宁 李红军 张立军 于 2021-09-24 设计创作，主要内容包括：本发明属于飞机设计技术领域,特别涉及一种飞机起落架侧撑杆机构,其包括上撑杆与下撑杆,下撑杆包括大端与小端,大端铰接起落架,小端铰接上撑杆；所述撑杆锁机构包括上锁撑杆、下锁撑杆与弹簧,开锁作动筒,上锁撑杆铰接下锁撑杆,下锁撑杆铰接靠近小端处,靠近大端处铰接弹簧,弹簧铰接上锁撑杆,锁作动筒铰接下撑杆与下锁撑杆之间,上锁撑杆的中部铰接所述起落架；上锁撑杆在铰接所述起落架处有的弯折,弯折方向朝向弹簧拉力方向；下锁撑杆铰接小端与大端的1/4靠近小端处；下锁撑杆为中空的四角星形结构,所述中空的四角星形结构,包括凹槽,开锁作动筒可卧于所述凹槽中,是侧撑杆又高强度且具有较高的折叠角度,节省飞机重量以及空间。(The invention belongs to the technical field of airplane design, and particularly relates to a side stay bar mechanism of an airplane landing gear, which comprises an upper stay bar and a lower stay bar, wherein the lower stay bar comprises a large end and a small end, the large end is hinged with the landing gear, and the small end is hinged with the upper stay bar; the stay bar lock mechanism comprises an upper lock stay bar, a lower lock stay bar, a spring and an unlocking actuating cylinder, the upper lock stay bar is hinged with the lower lock stay bar, the lower lock stay bar is hinged close to the small end, the spring is hinged close to the large end, the spring is hinged with the upper lock stay bar, the locking actuating cylinder is hinged between the lower stay bar and the lower lock stay bar, and the middle part of the upper lock stay bar is hinged with the undercarriage; the upper locking stay bar is bent at the position hinged with the undercarriage, and the bending direction faces to the tension direction of the spring; the small end of the lower lock stay bar is hinged with 1/4 of the large end close to the small end; the lower locking stay bar is of a hollow four-corner star-shaped structure, the hollow four-corner star-shaped structure comprises a groove, the unlocking actuator cylinder can lie in the groove, the lower locking stay bar is a side stay bar, the strength is high, the folding angle is high, and the weight and the space of the airplane are saved.)

1. A landing gear side stay bar mechanism comprises a stay bar mechanism and a stay bar lock mechanism;

the support rod mechanism comprises an upper support rod (1) and a lower support rod (2), the lower support rod (2) comprises a large end and a small end, the large end is hinged with the undercarriage, and the small end is hinged with the upper support rod (1);

the stay bar lock mechanism comprises an upper lock stay bar (3), a lower lock stay bar (4) and a spring (5), an unlocking actuating cylinder (8), the upper lock stay bar (3) is hinged with the lower lock stay bar (4), the lower lock stay bar (4) is hinged close to the small end and is hinged with the spring (5) close to the large end, the spring (5) is hinged with the upper lock stay bar (3), the lock actuating cylinder (8) is hinged between the lower stay bar (2) and the lower lock stay bar (4), and the middle part of the upper lock stay bar (3) is hinged with the undercarriage;

the landing gear is characterized in that the upper locking stay bar (3) is bent at an angle of 50-60 degrees at the position where the landing gear is hinged, and the bending direction faces to the tension direction of the spring; the lower lock stay bar (4) is hinged 1/4 between the small end and the big end close to the small end; the lower locking stay bar (4) is of a hollow four-corner star structure, the hollow four-corner star structure comprises a groove, and the unlocking actuating cylinder (8) can lie in the groove.

2. A landing gear side stay mechanism according to claim 1, wherein the unlocking ram (8) is hinged to the lower lock stay (4) at a distance from the upper lock stay (3) at the lower lock stay (4) which is no greater than 1/3 of the length of the lower lock stay (4).

3. A landing gear side stay mechanism according to claim 1, characterised in that the upper stay (1) is "Y" shaped, and the lower stay (2) partially sinks into the "Y" shaped gap of the upper stay (1) when the upper stay (1) is pivoted about the hinge point to overlap the lower stay (2).

4. The landing gear side stay mechanism according to claim 1, wherein the knuckle bearings are mounted where the upper stay (1) is hinged to the landing gear and where the lower stay (2) is hinged to the landing gear.

5. The landing gear side stay mechanism according to claim 1, wherein the upper stay (1) is hinged to the lower stay (2) by an upper and lower stay connecting shaft (6), the upper and lower stay connecting shaft (6) being of a hollow cylindrical structure, and end caps are mounted at both ends thereof, and the end caps are mounted and connected by a central shaft passing through the upper and lower stay connecting shaft (6).

6. The landing gear side stay mechanism according to claim 1, wherein the upper lock stay (3) is provided with a boss at a connection with the lower lock stay (4), the boss having a first threaded hole, the lower lock stay (4) having a second threaded hole at a corresponding position, the first threaded hole being fitted with a first bolt, the second threaded hole being fitted with a second bolt, the first bolt and the second bolt interfering with each other when the upper lock stay (3) reaches a predetermined angle with respect to the axis of the lower lock stay (4), and restricting the relative movement of the upper lock stay (3) and the lower lock stay (4).

7. The landing gear side brace mechanism of claim 6, wherein the axes of the first and second bolts are parallel to each other when the first and second bolts interfere with each other.

8. The landing gear side brace mechanism of claim 6, wherein a height adjustment shim is mounted between the first threaded hole or the second threaded hole and the first bolt or the second bolt.

9. The landing gear side stay mechanism according to claim 1, wherein the width of the hinge spring (5) in the upper lock stay (3) is gradually increased toward the bend.

10. A landing gear side stay mechanism according to claim 1, characterised in that the spring (5) is a double spring.

Technical Field

The invention belongs to the technical field of airplane design, and relates to a side stay bar mechanism of an airplane landing gear.

Background

The vaulting pole mainly used fixed stay of aircraft undercarriage, integrated receive and release and the vaulting pole of locking is the great preceding supporting mechanism of the preceding of space demand mostly, and the space that its needs is great, and its mechanism is comparatively complicated, and weight is big, still there is the not good enough problem of reliability, need specific space side vaulting pole at the undercarriage, and when needing integrated locking mechanical system, current configuration can not be when satisfying the high load of aircraft, and the side vaulting pole can satisfy high folding effect, has good load performance again concurrently.

Disclosure of Invention

In order to solve the above problems, the present application provides a landing gear side stay mechanism including a stay mechanism and a stay lock mechanism;

the supporting rod mechanism comprises an upper supporting rod and a lower supporting rod, the lower supporting rod comprises a large end and a small end, the large end is hinged with the undercarriage, and the small end is hinged with the upper supporting rod;

the stay bar lock mechanism comprises an upper lock stay bar, a lower lock stay bar, a spring and an unlocking actuating cylinder, the upper lock stay bar is hinged with the lower lock stay bar, the lower lock stay bar is hinged close to the small end, the spring is hinged close to the large end, the spring is hinged with the upper lock stay bar, the locking actuating cylinder is hinged between the lower stay bar and the lower lock stay bar, and the middle part of the upper lock stay bar is hinged with the undercarriage;

the upper locking stay bar is bent at a position hinged with the undercarriage by 50-60 degrees, and the bending direction faces to the tension direction of the spring; the small end of the lower lock stay bar is hinged with 1/4 of the large end close to the small end; the lower locking support rod is of a hollow four-corner star-shaped structure, the hollow four-corner star-shaped structure comprises a groove, and the unlocking actuating cylinder can lie in the groove.

Preferably, the distance between where the unlocking ram is hinged to the lower lock stay and where the upper lock stay is hinged to the lower lock stay is no greater than 1/3 times the length of the lower lock stay.

Preferably, the upper stay bar is in a "Y" shape, and when the upper stay bar is rotated around the hinge point to overlap with the lower stay bar, the lower stay bar portion is immersed in the "Y" shaped gap of the upper stay bar.

Preferably, joint bearings are arranged at the positions where the upper stay bar is hinged with the undercarriage and the positions where the lower stay bar is hinged with the undercarriage.

Preferably, the upper stay bar is hinged with the lower stay bar through an upper stay bar connecting shaft and a lower stay bar connecting shaft, the upper stay bar connecting shaft and the lower stay bar connecting shaft are of hollow cylindrical structures, end covers are installed at two ends of the upper stay bar connecting shaft and the lower stay bar connecting shaft, and the end covers are installed and connected through a central shaft penetrating through the upper stay bar connecting shaft and the lower stay bar connecting shaft.

Preferably, the upper locking stay bar is provided with a boss at the joint with the lower locking stay bar, the boss is provided with a first threaded hole, a second threaded hole is formed in the position corresponding to the lower locking stay bar, a first bolt is installed in the first threaded hole, a second bolt is installed in the second threaded hole, and when the upper locking stay bar reaches a preset angle with the axis of the lower locking stay bar, the first bolt and the second bolt interfere with each other to limit the relative movement of the upper locking stay bar and the lower locking stay bar.

Preferably, when the first bolt and the second bolt interfere with each other, axes of the first bolt and the second bolt are parallel to each other.

Preferably, a height adjustment spacer is installed between the first or second threaded hole and the first or second bolt.

Preferably, the width of the hinge spring of the upper lock stay is gradually increased toward the bent portion.

Preferably, the spring is a double spring.

The advantages of the present application include: the locking mechanism integrating the upper locking and the lower locking is integrated, the strut mechanism at the side of the aircraft landing gear can bear larger ground load, the strut lock can be mechanically locked, and the lock spring has double backup; the bearings are designed at the joints of the support rods, the large-folding space folding and unfolding can be met in a self-adaptive mode, the side support rods are simple in structure, reliable in locking, small in occupied space, light in weight, large in folding and unfolding angle and suitable for large and medium-sized airplanes.

The side stay bar mechanism with the large folding angle can ensure that the folding up and down positions are locked, and can self-adaptively meet the space folding and unfolding requirements of large folding, and the mechanism is simple and novel and has high reliability.

Drawings

FIG. 1 is a schematic view of the landing gear side stay mechanism and upper and lower stay connecting shaft of the present application;

FIG. 2 is a schematic view of the first bolt interfering with the second bolt;

FIG. 3 is a perspective view of the upper brace in the shape of a "Y";

FIG. 4 is a schematic view of the lower brace and a cross-sectional view thereof;

FIG. 5 is a schematic view of an upper lock stay;

FIG. 6 is a schematic view of the lower lock stay;

FIG. 7 is a schematic illustration of the landing gear side stay mechanism coupled to the landing gear;

FIG. 8 is a schematic view of the upper and lower struts folded;

figure 9 is a perspective view of the landing gear side stay mechanism.

Wherein, 1-upper stay bar, 2-lower stay bar, 3-upper stay bar, 4-lower lock stay bar, 5-spring, 6-upper and lower stay bar connecting shaft, 7-upper and lower lock stay bar connecting shaft, 8-unlocking actuating cylinder, 9-lock stay bar deflection, 10-stay bar deflection, 11-upper lock stay bar deflection adjusting bolt, 12-lower lock stay bar deflection adjusting bolt, 13-bond wire, 15-pillar, 16-buffer, 17-safety pin hole.

Detailed Description

In order to make the implementation objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the accompanying drawings in the embodiments of the present application. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all embodiments of the present application. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application, and should not be construed as limiting the present application. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application are within the scope of protection of the present application. Embodiments of the present application will be described in detail below with reference to the drawings.

The landing gear side strut mechanism as shown in figures 1, 7, 8, 9 comprises a strut mechanism and a strut lock mechanism;

the strut mechanism comprises an upper strut 1 and a lower strut 2, the lower strut 2 comprises a large end and a small end, the large end is hinged with the undercarriage, and the small end is hinged with the upper strut 1;

the stay bar lock mechanism comprises an upper lock stay bar 3, a lower lock stay bar 4 and a spring 5, an unlocking actuating cylinder 8, the upper lock stay bar 3 is hinged with the lower lock stay bar 4, the lower lock stay bar 4 is hinged close to the small end, the spring 5 is hinged close to the large end, the spring 5 is hinged with the upper lock stay bar 3, the locking actuating cylinder 8 is hinged between the lower stay bar 2 and the lower lock stay bar 4, and the middle part of the upper lock stay bar 3 is hinged with the undercarriage; the mechanism is driven by the tension of a spring

The upper locking stay bar 3 is bent by 60 degrees at the position hinged with the undercarriage, the bending direction faces to the tension direction of the spring, a better lever mechanism is formed by the bending and the connecting point of the upper locking stay bar 3 and the undercarriage, so that the elastic performance of the spring is still in a state of realizing interference locking of the upper locking stay bar 3 and the lower locking stay bar under the condition of smaller elasticity, the bending can enable the mechanical stress to be uniform, and the connection part of the upper locking stay bar and the spring cannot be damaged due to local strong stress in the use process of the overlarge tension of the spring; the hinged small end of the lower locking stay bar 4 and 1/4 of the large end are close to the small end, in the actual use process, the closer to the small end, the larger the acting force of the lower locking stay bar 4 on the small end is, but the stroke of the small end is correspondingly reduced, and through calculation, the force applied to the small end exceeds the required force, so that a larger folding angle can be obtained by sacrificing a part of force;

the lower locking support rod 4 is of a hollow four-corner star-shaped structure, the hollow four-corner star-shaped structure comprises a groove, an unlocking actuator cylinder 8 can lie in the groove, the unlocking actuator cylinder 8 is usually located between the lower locking support rod 4 and the lower support rod 2, the unlocking actuator cylinder body can obstruct the folding angle in the process of folding the lower locking support rod 4 and the lower support rod 2, in order to avoid the situation, the lower support rod is designed into the four-corner star-shaped structure as shown in figure 4, the cross section of the structure is approximately in the shape of a four-corner star, the structure has good bending resistance and can reduce the overall weight of the lower support rod, in addition, the lower support rod is provided with four edges, a groove is formed between every two edges, the groove can accommodate the unlocking actuator cylinder during folding, the folding angle of the mechanism can be enlarged, and the influence of the unlocking actuator cylinder is reduced to the minimum.

In some embodiments, limited to the unlocking ram model issue, where necessary, the stroke of the unlocking ram cannot support the linking of the unlocking ram 8 at the end of the lower lock stay, and in order to maintain good force and reduce interference of the unlocking ram with the lower lock stay 4, the distance at which the unlocking ram 8 is hinged to the lower lock stay 4 from where the locking stay 3 is hinged to the lower lock stay 4 is no greater than 1/3 the length of the lower lock stay 4.

In some possible embodiments, the upper stay 1 is in a "Y" shape as shown in fig. 3, when the upper stay 1 is rotated around the hinge point to overlap with the lower stay 2, the lower stay 2 is partially submerged into the "Y" shaped gap of the upper stay 1, and in addition, in order to ensure better accommodation performance, two arms of the "Y" are parallel at the port and bent at a large angle near the fork.

In some possible embodiments, the upper stay bar 1 is hinged to the undercarriage, and the lower stay bar 2 is hinged to the undercarriage, and the knuckle bearings meet the basic functions of the bearings and enable the components connected with the knuckle bearings to have other rotational degrees of freedom under low-speed use conditions.

In some possible embodiments, the upper brace 1 is hinged to the lower brace 2 through an upper brace connecting shaft 6 and a lower brace connecting shaft 6, the upper brace connecting shaft 6 and the lower brace connecting shaft 6 are hollow cylindrical structures, and end covers are mounted at two ends of the upper brace connecting shaft and the lower brace connecting shaft and are connected through a central shaft penetrating through the upper brace connecting shaft 6 and the lower brace connecting shaft.

In some possible embodiments, the upper lock stay 3 is provided with a boss at the connection with the lower lock stay 4, the boss has a first threaded hole, the lower lock stay 4 has a second threaded hole at the corresponding position, the first threaded hole is provided with a first bolt, the second threaded hole is provided with a second bolt, and when the upper lock stay 3 reaches a preset angle with the axis of the lower lock stay 4, the first bolt and the second bolt interfere with each other to limit the relative movement of the upper lock stay 3 and the lower lock stay 4.

In some possible embodiments, when the first bolt and the second bolt interfere with each other, the axes of the first bolt and the second bolt are parallel to each other, the main function of the first bolt and the second bolt is to form an interference part between the upper lock stay 3 and the lower lock stay 4, when the first bolt and the second bolt contact each other, the two bolts are stressed by compressive stress, when the axes of the first bolt and the second bolt are parallel to each other, if not on the same axis, the bolts are stressed by shear stress, and the shear stress has greater damage to the bolts.

In some possible embodiments, a height adjusting shim is installed between the first threaded hole or the second threaded hole and the first bolt or the second bolt, and the height of the bolt can be adjusted by the height adjusting shim, so that a preset angle reached by the upper lock stay 3 and the axis of the lower lock stay 4 can be further adjusted, and thus the deflection of the upper lock stay and the lower lock stay can be adjusted, and different angle adjustments of the lower stay and the landing gear can be realized.

In some possible embodiments, the width of the hinge spring 5 of the upper lock stay 3 becomes gradually larger towards the bend, where the bend carries higher forces, and the larger width facilitates higher load carrying of forces.

In some possible embodiments, the spring 5 is a double spring, which has a higher safety performance.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.