CN216660295U

CN216660295U - Retractable rocker arm for lifting buffer undercarriage

Info

Publication number: CN216660295U
Application number: CN202122283477.3U
Authority: CN
Inventors: 张剑剑; 李永洁; 张立军; 任国贤
Original assignee: AVIC First Aircraft Institute
Current assignee: AVIC First Aircraft Institute
Priority date: 2021-09-21
Filing date: 2021-09-21
Publication date: 2022-06-03
Anticipated expiration: 2031-09-21

Abstract

The utility model belongs to the technical field of aircraft design, a receive and release rocking arm of promotion buffer undercarriage one end of receiving and releasing rocking arm is the pillar ears, and the other end is the buffer ears, and pillar ears hinge the pillar, buffer ears hinge the buffer, and the pillar is the both arms structure, when receiving and releasing rocking arm submerges between the pillar both arms, receive and release rocking arm is in the state of transferring, there is the column arch in the middle of receiving and releasing the arm, the bellied end of column is the receive and release ears, its characterized in that, the bellied interlude of column is provided with the spring ears, and spring ears hinge spring connecting axle interlude, and the both ends of spring connecting axle articulate the spring respectively; the outer side of one of the two lugs of the buffer is provided with a hook-shaped boss, the strut is provided with a lower lock, and the hook-shaped boss of the lock is matched with the lower lock to lock the position of the retractable rocker arm, so that the retractable rocker arm has the functions of locking the retractable position and the laying position of the landing gear, and has small structural size and light weight.

Description

Retractable rocker arm for lifting buffer undercarriage

Technical Field

The utility model belongs to the technical field of airplane design, and relates to a retractable rocker arm for lifting a buffer undercarriage.

Background

In the undercarriage retracting mechanism component, the retracting rocker arm needs to meet the requirements of bearing and mechanism movement, so the function of the retracting mechanism is directly influenced by the quality of the structural design of the rocker arm. The design space of the landing gear is frequently restricted, so that the design of the rocker arm is limited by more factors, and the design difficulty is increased. In the lifting buffer type undercarriage structure, the lower assembly is only retracted to the limit position, and the retraction function is met under the condition that no additional functional part is added. Therefore, the design of the retractable rocker arm needs to meet the functions of bearing and retraction movement and also needs to bear part of the lower locking function, and the design of the rocker arm of the type can not be used for reference at present at home

SUMMERY OF THE UTILITY MODEL

In order to solve the problems, the application provides a retractable rocker arm for lifting a buffer undercarriage, one end of the retractable rocker arm is a support double lug, the other end of the retractable rocker arm is a buffer double lug, the support double lug is hinged with a support, the buffer double lug is hinged with a buffer, the support is of a double-arm structure, when the retractable rocker arm is immersed between the two arms of the support, the retractable rocker arm is in a downward state, a columnar bulge is arranged in the middle of the retractable rocker arm, and the tail end of the columnar bulge is a retractable double lug; the outer side of one of the two lugs of the buffer is provided with a hook-shaped boss, the support column is provided with a lower lock, and the hook-shaped boss is matched with the lower lock to lock the position of the retractable rocker arm.

Preferably, the two lugs of the strut, the two lugs of the buffer and the two lugs of the spring are parallel to each other, and an included angle is formed between the two lugs of the retracting and releasing and the parallel surface of the three lugs.

Preferably, a circumferential boss is arranged in the middle of the spring connecting shaft and connected with the two lugs of the spring through stop bolts, so that the spring connecting shaft is fixed.

Preferably, two stopping bosses are respectively arranged on two sides of the two lugs of the strut, and two stopping bosses are respectively arranged on two sides of the two lugs of the buffer.

Preferably, the included angle between the two retractable ears is 10-30 degrees.

Preferably, when the retractable rocker arm is in a downward state, the stop bosses on two sides of two lugs of the buffer are in contact with the supporting column to bear the force generated by the retractable rocker arm.

Preferably, the opposite surface of the side provided with the columnar bulge of the retractable rocker arm is a lower end surface, and a bearing cushion pad is arranged at the contact position of the lower end surface and the pillar.

Preferably, the spring connecting shaft is of a tubular structure, pull rod heads and rollers are mounted at two ends of the spring connecting shaft and are directly connected with the spring connecting shaft, the rollers are mounted on the pull rod heads, and springs are mounted on the rollers.

Preferably, the spring connecting shaft is made of aluminum alloy.

The advantages of the present application include: the landing gear has the functions of retraction and extension of the landing gear and locking of the down position; the main core component for switching the retraction and the bearing functions of the landing gear is novel in structural form and ingenious in design. The main structure of the rocker arm is composed of four pairs of space double ears, and the four pairs of space double ears are respectively connected with a strut, a buffer and a retractable actuating cylinder of the undercarriage and a spring; in the landing gear down position, the load of the buffer is smoothly transferred to the strut, which is a main component of the landing gear load; the lower safety spring is arranged at the lower position of the undercarriage, and the retractable rocker arm and the buffer form downward negative deflection and are main components of the first-stage lock of the lower lock; a hook-shaped boss is integrally designed in the rocker arm and is a main component of the secondary lock of the lower lock; when the undercarriage needs to be retracted, the retraction rocker arm transmits the driving force of the retraction actuator cylinder to the main retraction jack.

Drawings

FIG. 1 is a schematic view of a retractable rocker arm as provided herein.

FIG. 2 is a schematic view of the retractable rocker arm installation provided herein.

FIG. 3 is a top view of the retractable rocker arm provided herein.

FIG. 4 is a cross-sectional view of a retractable rocker arm connecting shaft as provided herein.

The hydraulic oil injection device comprises a support, two lugs, a 2 oil injection nozzle, a 3 stop table, a 4 retraction and release lug, a 5 spring connecting shaft, a 6 spring lug, a 7 stop bolt, an 8 oil injection nozzle, a 9 buffer lug, a 10 latch hook-shaped boss, a 11 first stop boss, a 12 second stop boss, a 13 third stop boss, a 20 retraction and release rocker arm, a 22 pull rod head, a 23 roller, a 31 retraction and release actuator cylinder, a 32 lower lock, a 33 buffer, a 35 spring and a 36 support, wherein the support is provided with a support and a stop lug.

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 application provides a retractable rocker arm for lifting a buffer undercarriage, one end of the retractable rocker arm is a support double-lug 1, the other end of the retractable rocker arm is a buffer double-lug 9, the support double-lug 1 is hinged with a support 36, the buffer double-lug 9 is hinged with a buffer 33, the support 36 is of a double-arm structure, when the retractable rocker arm is immersed between two arms of the support 36, the retractable rocker arm is in a lowering state, a columnar bulge is arranged in the middle of the retractable arm, and the tail end of the columnar bulge is a retractable double-lug 4; a hook-locking boss 10 is arranged on the outer side of one of the buffer double lugs 9, a lower lock 32 is arranged on the strut 36, and the hook-locking boss 10 is matched with the lower lock 32 to lock the position of the retractable rocker arm.

The retractable rocker arm is composed of four pairs of space double ears, and the four pairs of space double ears are respectively connected with a strut, a buffer and a retractable actuating cylinder of the undercarriage and a spring; the retractable rocker arm is integrated with a hook-shaped boss and has the function of locking a lower lock; each pair of double lugs is provided with a stop mode of a corresponding mounting shaft; the two pairs of double lugs in the main bearing area are protected by bushings and lubricated, the retractable double lugs and the other double lugs form a spatial included angle, and the double lugs and the main support plane form an inclined angle so that the swing angle of the retractable actuating cylinder can be reduced; the included angle of the retracting double lugs is 30 degrees;

the stop table of the traditional strut bearing area is designed in a single direction, and the problem of uneven stress caused by the single direction in the experience of actual use is solved; in addition, the double ears of the retraction bearing area adopt the form of a lining protection and stop table;

the opposite surface of one side of the retractable rocker arm provided with the columnar protrusions is a low-end surface, the bottom end surface of the double-lug area of the buffer is traditionally only required to be stopped and loaded by a stop bolt, but the stop bolt is not required to be stopped, so that the low end of the retractable rocker arm can be loaded, the size of the low end is more than twice as wide as that of the low end of the dual-lug area of the buffer, the bottom end surface of the double-lug area of the low-end buffer needs to bear the function of stopping when the dual-lug area of the buffer is put down, and a bearing cushion pad is arranged at the contact position of the low end surface and the strut 36, so that the bearing of the low-end surface force can be realized.

The two lugs of the spring connecting area belong to a small load area, the bushing protection is omitted, and the stopping of the spring connecting area adopts a mode of arranging a small shaft in the circumferential direction; the small shaft can limit the rotation and the axial sliding of the pull rod; compared with the traditional spring connecting rod directly fixed by a large screw sleeve, the spring connecting rod is much lighter and smaller, and is more convenient to install.

The spring connecting shaft is designed in a split mode, is separated from a main structural part of the retractable rocker arm and is designed in a tubular mode, and the weight can be reduced; the main shaft-lifting part can be made of aluminum alloy, the rigidity is improved under the condition of reducing the loading capacity of the main shaft-lifting part, and the weight is light; the spring connecting shaft is provided with a separated roller, so that the spring is convenient to mount.

The landing gear has the functions of retraction, extension and locking; the main core component for switching the retraction and the bearing functions of the landing gear is novel in structural form and ingenious in design. The design of the retractable rocker arm is a process of comprehensively balancing and optimizing and integrating the functions of bearing, moving and locking. The main structure of the rocker arm is composed of four pairs of space double ears, and the four pairs of space double ears are respectively connected with a strut, a buffer and a retractable actuating cylinder of the undercarriage and a spring; in the landing gear down position, the load of the buffer is smoothly transferred to the strut, which is a main component of the landing gear load; the lower safety spring is arranged at the down position of the undercarriage, and the retractable rocker arm and the buffer form downward negative deflection and are main components of the first-stage lock of the lower lock; a hook-shaped boss is integrally designed in the rocker arm and is a main component of the secondary lock of the lower lock; when the undercarriage needs to be retracted, the retraction rocker arm transmits the driving force of the retraction actuator cylinder to the main retraction jack.

Claims

1. A retractable rocker arm for lifting a buffer undercarriage is characterized in that a spring double lug (6) is arranged in the middle section of a columnar bulge, the spring double lug (6) is hinged to the middle section of a spring connecting shaft (5), and springs (35) are hinged to the two ends of the spring connecting shaft (5); a hook-shaped boss (10) is arranged on the outer side of one of the two lugs (9) of the buffer, a lower lock (32) is arranged on the strut (36), and the hook-shaped boss (10) is matched with the lower lock (32) to lock the position of the retractable rocker arm.

2. The retractable rocker arm for lifting the landing gear of the buffer as claimed in claim 1, wherein the strut ears (1), the buffer ears (9) and the spring ears (6) are parallel to each other, and the retractable ears (4) form an included angle with the parallel plane of the strut ears, the buffer ears (9) and the spring ears.

3. The retractable rocker arm for lifting the landing gear of a buffer as claimed in claim 1, wherein a circumferential boss is arranged in the middle of the spring connecting shaft (5), and the circumferential boss is connected with the spring double lugs (6) through stop bolts (7) to fix the spring connecting shaft (5).

4. A retractable rocker arm for lifting the landing gear of a shock absorber, as claimed in claim 1, wherein the two strut ears (1) are each provided with a second stop boss (12) on each side and the two shock absorber ears (9) are each provided with a first stop boss (11) on each side.

5. The retractable rocker arm for lifting the landing gear of a shock absorber according to claim 2, wherein the included angle between the retractable ears (4) is 10 to 30 degrees.

6. The retractable rocker arm for lifting the landing gear of a buffer according to claim 4, wherein the first stop bosses (11) on both sides of the two lugs (9) of the buffer are in contact with the strut (36) when the retractable rocker arm is in the lowering state, and bear the force generated by the retractable rocker arm.

7. A retractable rocker arm for a lift-buffer landing gear, according to claim 6, characterized in that the face of said retractable rocker arm provided with said cylindrical projection opposite to said face is the lower face, said lower face being provided with a load-bearing cushion at the contact with said pillar (36).

8. The retractable rocker arm for lifting the landing gear of the buffer as claimed in claim 1, wherein the spring connecting shaft (5) is of a tubular structure, the pull rod head (22) and the roller (23) are mounted at two ends of the spring connecting shaft (5), the pull rod head (22) is directly connected with the spring connecting shaft (5), the roller (23) is mounted on the pull rod head (22), and the spring (35) is mounted on the roller (23).

9. The retracting rocker arm for lifting the landing gear of a shock absorber as claimed in claim 1, wherein the spring connecting shaft (5) is made of an aluminum alloy.