CN114030598B

CN114030598B - Retractable rocker arm type landing gear

Info

Publication number: CN114030598B
Application number: CN202111382114.3A
Authority: CN
Inventors: 刘晓志; 汪兰明; 陈翔; 焦阳
Original assignee: China Helicopter Research and Development Institute
Current assignee: China Helicopter Research and Development Institute
Priority date: 2021-11-19
Filing date: 2021-11-19
Publication date: 2023-09-08
Anticipated expiration: 2041-11-19
Also published as: CN114030598A

Abstract

The application discloses a retractable rocker arm type undercarriage, wherein the upper end of an integral retractable buffer is respectively hinged with a first machine body joint, and the lower end of the integral retractable buffer is respectively hinged with a rocker arm; it is configured to absorb energy and receive and release two functional modes; the machine wheels are respectively arranged at the lower ends of the rocker arms, the upper ends of the rocker arms are respectively connected with the transverse pipes, and the end parts of the rocker arms are arranged with the transverse pipes in a sleeve manner, so that the rocker arms can rotate around the axes of the transverse pipes and can also move along the axes; the transverse pipes are respectively hinged with the second machine body joint; the end parts of the transverse pipes are respectively provided with a connecting fork lug, the connecting fork lugs on the transverse pipes are connected through the shaft pins, and the transverse pipes can rotate around the shaft pin axis; one end of the retractable actuating cylinder is hinged with the pin shaft, and the other end of the retractable actuating cylinder is hinged with the third machine body joint; the retractable actuating cylinder has the functions of an upper lock and a lower lock. The scheme can increase the winding and unwinding functions on the basis of ensuring the performance of the buffer, and better meets the actual use requirements.

Description

Retractable rocker arm type landing gear

Technical Field

The application relates to the field of structural design, in particular to a retractable rocker arm type landing gear.

Background

For a high-speed helicopter, in order to ensure high-speed flight and reduce air resistance, the main landing gear and the tail landing gear can be retracted and hidden in a fuselage when the helicopter flies in the air; before landing, the main landing gear and the tail landing gear can be put down, so that the helicopter can safely land; however, the landing device of the active domestic helicopter basically has no retraction function.

Disclosure of Invention

The application aims to provide a retractable rocker type landing gear applicable to a helicopter.

In order to realize the tasks, the application adopts the following technical scheme:

the utility model provides a receive and release rocking arm formula undercarriage, this undercarriage is symmetrical structure, receive and release the integral bumper ware, rocking arm, violently pipe and the wheel that include receive and release actuator cylinder and symmetry setting, wherein:

the upper end of the integral type folding buffer is respectively hinged with the first machine body joint, and the lower end of the integral type folding buffer is respectively hinged with the rocker arm; the integral type retractable buffer can be configured into two functional modes of energy absorption and retraction, so that the integral type retractable buffer can be used as a buffer or an actuator cylinder;

the machine wheels are respectively arranged at the lower ends of the rocker arms, the upper ends of the rocker arms are respectively connected with the transverse pipes, and the end parts of the rocker arms are arranged with the transverse pipes in a sleeve manner, so that the rocker arms can rotate around the axes of the transverse pipes and can also move along the axes;

the transverse pipes are respectively hinged with the second machine body joint; the end parts of the transverse pipes are respectively provided with a connecting fork lug, the connecting fork lugs on the transverse pipes are connected through shaft pins, and the transverse pipes can rotate around the shaft pin axis;

one end of the retractable actuator cylinder is hinged with the shaft pin, and the other end of the retractable actuator cylinder is hinged with the third machine body joint; the retractable actuating cylinder has the functions of an upper lock and a lower lock.

Further, when the integral folding buffer is used as an actuator cylinder, the integral folding buffer has the capability of locking in an upper position and a lower position.

Further, the upper end of the rocker arm has a sleeve, and the end of the cross tube is inserted and fitted into the rocker arm.

Further, when the helicopter lands, the landing gear firstly touches the ground, and the landing gear absorbs part of landing energy through the deformation of the tire; the landing load is transferred to the rocker arm and the integral folding buffer through the wheels, and then transferred to the first body joint, the second body joint and the third body joint through the rocker arm and the integral folding buffer; when the landing load reaches a certain value, the integral type retractable buffer starts to compress and absorb energy until the landing energy of the helicopter is completely absorbed; in the landing process, the retraction function of the integral retraction buffer is closed, and retraction can not be performed.

Further, when the landing gear is folded and unfolded, the integral folding and unfolding buffer is used as an actuating cylinder; the integral retractable buffer is retracted and locked at an upper locking retraction position, so that the rocker arm and the wheel are retracted upwards; when the integral retractable buffer is retracted and locked at the upper position, the retractable actuating cylinder is extended and locked at the upper position, the rocker arm is retracted inwards, and the retraction action of the landing gear is completed.

Further, the retractable actuator cylinder is extended and locked at the upper position, and the rocker arm is retracted inwards; the retraction actuator cylinder is extended and locked at the upper position, the integral retraction buffer is retracted and locked at the upper position, and the rocker arm and the machine wheel are retracted upwards; at this time, the landing gear stowing operation is completed.

Further, the retraction actuator cylinder is extended to retract the rocker arm inwards; meanwhile, the integral folding buffer is contracted, and the rocker arm and the machine wheel are folded upwards; when the retraction actuator cylinder and the integral retraction buffer are locked in the upper position, the retraction action of the landing gear is completed.

Further, the retractable actuator cylinder is contracted and locked at the lower position, and the rocker arm is outwards extended; after the retraction actuator cylinder is retracted and locked in the lower position, the integral retraction buffer is extended and locked in the lower position, and the rocker arm and the machine wheel are put down to complete the landing gear down motion.

Further, the integral folding buffer is extended and locked at the lower position, and the rocker arm and the machine wheel are put down; the integral retractable buffer is extended, and after the lower position is locked, the retractable actuating cylinder is contracted and locked at the lower position, the rocker arm is outwards extended, and the landing gear is completed.

Further, the retractable actuator cylinder is contracted, and the rocker arm is outwards extended; meanwhile, the integral folding buffer is extended, and the rocker arm and the machine wheel are put down; and when the retraction actuator cylinder and the integral retraction buffer are locked in the lower position, the retraction action of the landing gear is completed.

Compared with the prior art, the application has the following technical characteristics:

in the scheme, the integral type retraction buffer has the retraction function; the left and right transverse pipes are connected with the machine body joint in a hinged manner; the left transverse tube and the right transverse tube are connected through a shaft pin and can rotate around the shaft pin axis; the actuating cylinder controls the left transverse tube and the right transverse tube to complete rotation through the pin shaft of the connecting piece; when the integral type retraction buffer and the actuating cylinder perform retraction movement, a fixed logic relationship does not exist; the scheme can increase the winding and unwinding functions on the basis of ensuring the performance of the buffer, and better meets the actual use requirements.

Drawings

FIG. 1 is a schematic diagram of the overall structure of the present application;

FIG. 2 is a schematic diagram of the connection structure of the left and right transverse pipes;

FIG. 3 is a schematic diagram of the structure of the integrated retractable buffer after shrinking;

fig. 4 is a schematic view of the structure of the actuator after extension.

The reference numerals in the figures illustrate: 1. the device comprises a first machine body joint, a second machine body joint, a third machine body joint, 6 and 7 integral folding buffers, 8 and 9 rocker arms, 10 and 11 transverse pipes, 12 and 13 wheels, 14 folding cylinders and 15 shaft pins.

Detailed Description

Referring to the drawings, the application provides a retractable rocker arm type landing gear which is of a symmetrical structure and comprises a retractable actuating cylinder 14, an integral retractable buffer 6/7, a rocker arm 8/9, a transverse tube 10/11 and a wheel 12/13, wherein the integral retractable buffer 6/7 is symmetrically arranged, and the rocker arm comprises:

the upper ends of the integral type retractable buffers 6/7 are respectively connected with the first machine body joint 1/2 in a hinged mode; the lower ends of the integral type retractable buffers 6/7 are respectively connected with the rocker arms 8/9 in a hinged manner; the integral type retractable buffer 6/7 can be configured into two functional modes of energy absorption and retraction, namely the integral type retractable buffer 6/7 can be used as a buffer or an actuating cylinder; when the integral retractable buffer 6/7 is used as an actuator cylinder, the device has the capability of locking in an upper position and a lower position.

The machine wheels 12/13 are respectively arranged at the lower ends of the rocker arms 8/9, the upper ends of the rocker arms 8/9 are respectively connected with the transverse pipes 10/11, and the end parts of the rocker arms 8/9 are arranged with the transverse pipes 10/11 in a sleeve manner, so that the rocker arms 8/9 can rotate around the axes of the transverse pipes 10/11 and can also move along the axial directions; specifically, the upper end of the rocker arm 8/9 has a sleeve, and the end of the cross tube 10/11 is inserted and fitted into the rocker arm 8/9.

The transverse pipes 10/11 are respectively connected with the second machine body joints 3/4 in a hinged mode.

The end parts of the transverse pipes 10/11 are respectively provided with a connecting fork lug, the two connecting fork lugs are connected through the shaft pin 15, and the transverse pipes 10/11 can rotate around the axis of the shaft pin 15.

One end of the retractable actuator cylinder 14 is connected with the pin shaft 15, and the other end is connected with the third machine body joint 5 in a hinged manner; the retraction jack 14 has an up lock function and a down lock function.

Working principle:

energy absorption: when the helicopter lands, the wheels 12/13 firstly touch the ground, and the landing gear absorbs part of landing energy through the deformation of the tire; landing load is transferred to the rocker arm 8/9 and the integral retractable buffer 6/7 through the wheel 12/13, and then transferred to the fuselage plug 1/2/3/4/5 through the rocker arm 8/9 and the integral retractable buffer 6/7; when the landing load reaches a certain value, the integral retractable buffer 6/7 starts to compress and absorb energy until the landing energy of the helicopter is completely absorbed. In the landing process, the retraction function of the integral retraction buffer 6/7 is closed, and the retraction operation cannot be performed.

Stowing 1: the integral retractable buffer 6/7 is a buffer and an actuator cylinder; when the landing gear is retracted and released, the integral retraction buffer 6/7 is used as an actuating cylinder; the integral retractable buffer 6/7 is retracted and locked in the upper locking/retracting position, and the rocker arm 8/9 and the wheel 12/13 are retracted upwards; when the integrated retraction bumper 6/7 is retracted and locked in the upper position, the retraction jack 14 is extended and locked in the upper position, retracting the rocker arm inwardly. At this time, the landing gear stowing operation is completed.

Stowing 2: the retraction jack 14 extends and locks in the upper position, retracting the rocker arm inwardly. The retraction jack 14 is extended and after upper locking the integrated retraction bumper 6/7 is retracted and locked in upper position retracting the swing arm 8/9 and wheel 12/13 upwardly. At this time, the landing gear stowing operation is completed.

Stowing 3: the retraction jack 14 extends to retract the rocker arm inwardly. At the same time, the integral retracting buffer 6/7 is retracted, retracting the rocker arm 8/9 and the wheel 12/13 upwards. When the upper locking of the retraction jack 14 and the integral retraction buffer 6/7 is completed, the landing gear retraction motion is completed.

Put down 1: retraction jack 14 is retracted and locked in the lower position, extending the rocker arm outwardly; after retraction jack 14 is retracted and locked in the lower position, integral retraction bumper 6/7 is extended and locked in the lower position, lowering rocker arm 8/9 and wheel 12/13. At this time, the landing gear lowering operation is completed.

Put down 2: the integral retractable buffer 6/7 is extended and locked at the lower position, and the rocker arm 8/9 and the machine wheel 12/13 are put down; the integral retraction bumper 6/7 is extended and after the lower lock, the retraction jack 14 is retracted and locked in the lower position, extending the swing arm outwardly. At this time, the landing gear lowering operation is completed.

Put down 3: retraction of the jack 14 expands the rocker arm outwardly; at the same time, the integrated retracting buffer 6/7 is extended, lowering the swing arm 8/9 and the wheel 12/13. When the retraction jack 14 and the integral retraction bumper 6/7 are both fully down locked, the landing gear retraction is completed.

Typically, landing gear only needs to absorb a certain amount of landing energy. The energy level is general, the buffer has small acting and short corresponding compression stroke, so the buffer has compact structural design, and the occupied space of the whole landing gear structure is smaller. At this time, even if the buffer does not have the retraction function, enough space is provided in the helicopter to install the retraction device, and the whole landing gear is retracted and hidden in the fuselage.

However, when the landing gear has crash resistance, the landing gear needs to absorb a large amount of crash energy, and the level of the crash energy is far higher than that of the general case. To ensure that the landing gear fully absorbs crash energy, the buffer of the core component of the landing gear acts more. To be able to control the landing load at a lower level, the buffer compression stroke is much greater than usual, and the length of the buffer itself is much longer than usual, resulting in a larger overall landing gear structure footprint. The internal space of the helicopter cannot meet the requirement that the landing gear is wholly retracted and hidden in the fuselage. Therefore, the buffer has the characteristic of a retraction function, the whole landing gear space structure can be contracted to a smaller range, and the occupied structure space of the machine body is smaller when the landing gear is retracted into the machine body, so that the retraction function is realized more conveniently.

The above embodiments are only for illustrating the technical solution of the present application, and are not limiting thereof; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced equally; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.

Claims

1. The utility model provides a receive and release rocking arm formula undercarriage, its characterized in that, this undercarriage is symmetrical structure, including receive and release actuator cylinder (14) and integral receive and release buffer (6)/(7) of symmetry setting, rocking arm (8)/(9), violently manage (10)/(11) and wheel (12)/(13), wherein:

the upper ends of the integral type retractable buffers (6)/(7) are respectively hinged with the first machine body joint (1)/(2), and the lower ends of the integral type retractable buffers (6)/(7) are respectively hinged with the rocker arms (8)/(9); the integral type retractable buffer (6)/(7) can be configured into two functional modes of energy absorption and retraction, so that the integral type retractable buffer (6)/(7) can be used as a buffer or a actuating cylinder;

the machine wheels (12)/(13) are respectively arranged at the lower ends of the rocker arms (8)/(9), the upper ends of the rocker arms (8)/(9) are respectively connected with the transverse pipes (10)/(11), and the end parts of the rocker arms (8)/(9) are arranged with the transverse pipes (10)/(11) in a sleeve manner, so that the rocker arms (8)/(9) can rotate around the axes of the transverse pipes (10)/(11) and can also move along the axial direction;

the transverse pipes (10)/(11) are respectively hinged with the second machine body joints (3)/(4); the end parts of the transverse pipes (10)/(11) are respectively provided with a connecting fork lug, the connecting fork lugs on the transverse pipes (10)/(11) are connected through the shaft pin (15), and the transverse pipes (10)/(11) can rotate around the axis of the shaft pin (15);

one end of the retractable actuator cylinder (14) is hinged with the shaft pin (15), and the other end is hinged with the third machine body joint (5); the retractable actuator cylinder (14) has the functions of an upper lock and a lower lock;

when the integral retractable buffer (6)/(7) is used as an actuating cylinder, the device has the capability of locking in upper and lower positions;

the upper end of the rocker arm (8)/(9) is provided with a sleeve, and the end part of the transverse tube (10)/(11) is inserted and assembled into the rocker arm (8)/(9);

when the landing gear is retracted and released, the integral retraction buffer (6)/(7) is used as an actuating cylinder; the integral retractable buffer (6)/(7) is retracted and locked at the upper locking/retracting position, and the rocker arm (8)/(9) and the machine wheel (12)/(13) are retracted upwards; when the integral retractable buffer (6)/(7) is contracted and locked at the upper position, the retractable actuating cylinder (14) is extended and locked at the upper position, the rocker arm (8)/(9) is retracted inwards, and the landing gear retraction action is completed;

the retractable actuator cylinder (14) is contracted and locked at the lower position, and the rocker arm is outwards extended; after the retraction actuator cylinder (14) is retracted and locked in the lower position, the integral retraction buffer (6)/(7) is extended and locked in the lower position, and the rocker arm (8)/(9) and the wheel (12)/(13) are put down to complete the landing gear down action.

2. The retractable rocker landing gear according to claim 1, characterized in that when the helicopter lands, the wheels (12)/(13) touch the ground first, the landing gear absorbing part of the landing energy by tyre deformation; the landing load is transferred to the rocker arm (8)/(9) and the integral folding buffer (6)/(7) through the wheels (12)/(13), and then transferred to the first body joint (1)/(2), the second body joint (3)/(4) and the third body joint (5) through the rocker arm (8)/(9) and the integral folding buffer (6)/(7); when the landing load reaches a certain value, the integral retractable buffer (6)/(7) starts to compress and absorb energy until the landing energy of the helicopter is completely absorbed; in the landing process, the retraction function of the integral retraction buffer (6)/(7) is closed, and the retraction action cannot be performed.

3. The retractable rocker landing gear of claim 1, wherein the retraction jack (14) extends and locks in the upper position, retracting the rocker inwardly; after the retraction actuator cylinder (14) is extended and locked at the upper position, the integral retraction buffer (6)/(7) is retracted and locked at the upper position, and the rocker arm (8)/(9) and the machine wheel (12)/(13) are retracted upwards; at this time, the landing gear stowing operation is completed.

4. The retractable rocker landing gear of claim 1, wherein the retraction jack (14) extends to retract the rocker inward; meanwhile, the integral folding buffer (6)/(7) is contracted, and the rocker arm (8)/(9) and the machine wheel (12)/(13) are folded upwards; when the retraction actuator cylinder (14) and the integral retraction buffer (6)/(7) are locked in the upper position, the retraction action of the landing gear is completed.

5. The retractable rocker landing gear according to claim 1, characterized in that the integrated retractable bumper (6)/(7) is extended and locked in the lower position, lowering the rocker (8)/(9) and the wheels (12)/(13); after the integral retractable buffer (6)/(7) is extended and locked at the lower position, the retractable actuating cylinder (14) is contracted and locked at the lower position, and the rocker arm is outwards extended to finish the landing gear lowering action.

6. The retractable rocker landing gear of claim 1, wherein the retraction jack (14) is retracted, extending the rocker outward; meanwhile, the integral folding buffer (6)/(7) is stretched, and the rocker arm (8)/(9) and the machine wheel (12)/(13) are put down; when the retraction actuator cylinder (14) and the integral retraction buffer (6)/(7) are locked in the lower position, the retraction action of the landing gear is completed.