CN112061382B

CN112061382B - Frame formula undercarriage brake hose connection structure

Info

Publication number: CN112061382B
Application number: CN202010952990.4A
Authority: CN
Inventors: 关维; 路红伟; 宁晓东; 徐达生; 金军; 李志愿; 禹新鹏; 鲁德发; 李兆昕; 朱晓宁
Original assignee: AVIC Landing Gear Advanced Manufacturing Corp
Current assignee: AVIC Landing Gear Advanced Manufacturing Corp
Priority date: 2020-09-11
Filing date: 2020-09-11
Publication date: 2022-04-08
Anticipated expiration: 2040-09-11
Also published as: CN112061382A

Abstract

The invention discloses a frame type undercarriage brake hose connecting structure which comprises a buffer support column, a torsion arm and a frame, wherein the torsion arm is mounted on a piston rod of the buffer support column through a first pin shaft, the bottom of the piston rod is hinged with the frame, an A hose which can bend along with the torsion arm is mounted on the torsion arm, a B hose which can pitch along with the frame is mounted on the frame, a first set point on the piston rod is fixedly provided with a first adapter, a second set point on the piston rod is fixedly provided with a second adapter, a hard tube is connected between the first adapter and the second adapter, the other end of the first adapter is rotatably connected with the A hose, and the other end of the second adapter is rotatably connected with the B hose. The invention improves the stress state of the brake hose of the undercarriage and prolongs the service life of the brake hose.

Description

Frame formula undercarriage brake hose connection structure

Technical Field

The invention relates to an undercarriage, in particular to a frame type undercarriage brake hose connecting structure.

Background

In a certain type of landing gear system, along with the increase of the life of the landing gear in the first turn period, higher requirements are provided for the first turn life of a matched hydraulic hose assembly. The main undercarriage structure is a four-wheel trolley frame type, and when the undercarriage is in landing impact or slides on the ground, a brake hose for providing a power source for the airplane wheel has a bending problem at a bent part due to pitching of the trolley frame and compression of a piston rod of a buffer supporting column. Limited by spatial arrangement, the brake hose traditionally employs a rubber hose. The rubber hose has the advantages of large elasticity and small bending radius, can meet the requirements of the actual use condition-bending and twisting combined action, but has the defects of easy aging, poor thermal stability, short service life and the like. The service life of the rubber hose 6 in the calendar year is far from the first-turn life of 10 calendar years required by a host.

At present, a brake hose is made of polytetrafluoroethylene materials, but the polytetrafluoroethylene hose has the characteristics of large bending radius and sensitivity in bearing torsional load, the actual bending radius of the brake hose in the existing brake pipeline connecting structure is smaller than the standard specified value of the polytetrafluoroethylene hose with the same specification, and the use working condition is the comprehensive action of bending and twisting, so that the brake pipeline connecting structure must be improved to improve the stress state of the brake hose and meet the requirements of the use working condition and the service life.

Disclosure of Invention

The invention aims to solve the technical problem that the stress condition of a brake hose in the existing brake pipeline connecting structure is severe and the service life of the brake hose is influenced, and provides a frame type undercarriage brake hose connecting structure which can improve the stress condition of the brake hose and prolong the service life of the brake hose.

In order to solve the technical problem, the invention provides a frame type undercarriage brake hose connecting structure which comprises a buffer support, a torsion arm and a frame, wherein the torsion arm is mounted on a piston rod of the buffer support through a first pin shaft, the bottom of the piston rod is hinged with the frame, an A hose which follows the torsion arm to perform bending motion is mounted on the torsion arm, a B hose which follows the frame to perform pitching motion is mounted on the frame, a first adapter is fixedly mounted at a first set point on the piston rod, a second adapter is fixedly mounted at a second set point on the piston rod, a hard tube is connected between the first adapter and the second adapter, the other end of the first adapter is rotatably connected with the A hose, and the other end of the second adapter is rotatably connected with the B hose.

When a piston rod of the buffer strut is compressed, the torsion arm is folded, the hose A performs bending motion along with the torsion arm, the first rotary joint deflects along with the torsion arm in the process, and the hose A can freely swing relative to the first rotary joint without bearing torsional load due to the rotary connection of the first rotary joint and the hose A, so that the stress state of the hose A is changed, and the service life of the hose A is prolonged.

When the frame takes place the every single move (high back low in the front or low back high in the front), the B hose carries out the luffing motion along with the frame, because second adapter and B hose swivelling joint, therefore the B hose can freely swing relatively the second adapter, does not bear torsional load to change the stress state of B hose, improved the life of B hose.

The inlet of the hose A is connected with a hydraulic system of the airplane body, the outlet of the hose B is connected with a braking system of the airplane wheel, and working media in a braking oil path circulate through the hose A, the first adapter, the hard tube, the second adapter and the hose B.

In one embodiment, to ensure that the hose A performs bending motion along the torsion arm of the landing gear, the hose A is fixedly arranged along the side surface of the torsion arm; in order to ensure that the hose B performs pitching motion along with the frame, the hose B is parallel to the frame and is fixedly installed perpendicular to the pitching motion axis of the frame.

The first setpoint is the first pin.

The second set point is where the piston rod is articulated to the frame.

First adapter includes first rotatory mouthpiece, first fixed mouthpiece and first fastening end, first rotatory mouthpiece with hose A fixed connection, first fixed mouthpiece with the one end fixed connection of hard tube, first fastening end with first round pin axle fixed connection.

The second adapter includes the rotatory mouthpiece of second, the fixed mouthpiece of second and second fastening end, the rotatory mouthpiece of second with B hose fixed connection, the fixed mouthpiece of second with the one end fixed connection of hard tube, the second fastening end with piston rod fixed connection.

Compared with the prior art, the invention has the beneficial effects that:

according to the invention, the hose A bends along with the torsion arm of the undercarriage, the hose B tilts along with the frame, the hose A is rotatably connected with the first adapter, the hose B is rotatably connected with the second adapter, and the first adapter and the second adapter are connected through the hard tube, so that the stress state of the brake hose is changed, the service condition of the brake hose is improved, and the service life of the brake hose of the undercarriage is prolonged.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic front view of a brake hose connection structure of a truck frame type landing gear according to the present invention.

FIG. 2 is a side view of the undercarriage brake hose connection of the present invention.

Fig. 3 is a view showing a state where the brake hose of the present invention is connected.

Fig. 4 is a schematic structural view of a first adapter of the present invention.

Fig. 5 is a schematic structural diagram of a second adapter according to the present invention.

In the figure:

1-a hose, 2-first swivel, 3-hard, 4-B hose, 5-yoke, 6-second swivel, 7-yoke, 8-frame, 9-torque arm, 10-piston rod, 201-first rotating nozzle, 202-first fixed nozzle, 203-first fastening end, 601-second fixed nozzle, 602-second rotating tube, 603-second fastening end, 901-first pin, 2011-second outer tube, 2012-second inner tube, 2013-second gasket, 2014-second bolt, 6021-second outer tube, 6022-second inner tube, 6023-second gasket, 6024-second bolt.

Detailed Description

The invention is further described below with reference to specific preferred embodiments, without thereby limiting the scope of protection of the invention.

For convenience of description, the relative positional relationship of the components, such as: the descriptions of the upper, lower, left, right, etc. are described with reference to the layout directions of the drawings in the specification, and do not limit the structure of the present patent.

As shown in fig. 1-5, an embodiment of the connection structure for the brake hose of the undercarriage of the present invention includes a buffer strut, a torque arm 9 and an undercarriage 8, wherein the torque arm 9 includes an upper section and a lower section which can be bent relatively, and the torque arm 9 is mounted on a piston rod 10 of the buffer strut via a first pin 901, and the bottom of the piston rod 10 is hinged to the middle of the undercarriage 8. The side surface of the torque arm 9 is fixedly provided with an A hose 1 which follows the torque arm 9 to perform bending motion by utilizing a hoop 7, and the frame 8 is fixedly provided with a B hose 4 which follows the frame 8 to perform pitching motion by utilizing a hoop 5. In this embodiment, the B hose 4 is fixedly mounted parallel to the frame 8 and perpendicular to the pitch motion axis of the frame 8. A first adapter 2 is fixedly installed on the first pin 901, a second adapter 6 is fixedly installed at the bottom of the piston rod 10, and a hard tube 3 is installed between the first adapter 2 and the second adapter 6.

The first adapter 2 comprises a first rotating nozzle 201, a first fixed nozzle 202 and a first fastening end 203, the first rotating nozzle 201 is fixedly connected with the outlet of the hose a 1, the first fixed nozzle 202 is fixedly connected with one end of the hard tube 3, and the first fastening end 203 is fixedly connected with the first pin 901 through a screw. In this embodiment, the first rotary nozzle 201 includes a first inner tube 2012 and a first outer tube 2011, the first outer tube 2011 is fit-fitted over the first inner tube 2012 in a clearance manner, so that the first outer tube 2011 can rotate around the first inner tube 2012, and a first sealing ring 2013 is disposed between the first outer tube 2011 and the first inner tube 2012. To ensure that the first outer tube 2011 is stably connected with the first inner tube 2012, the first outer tube 2011 and the end of the first inner tube 2012 are integrally fastened by a first bolt 2014.

Second adapter 6 includes the rotatory nozzle 602 of second, the fixed nozzle 601 of second and second fastening end 603, the rotatory nozzle 602 of second with the import fixed connection of B hose 4, the fixed nozzle 601 of second with the one end fixed connection of hard tube 4, second fastening end 603 with screw fixed connection is passed through to the bottom of piston rod 10. In this embodiment, the second rotary nozzle 602 includes a second inner tube 6022 and a second outer tube 6021, the second outer tube 6021 is loosely fitted over the second inner tube 6022 such that the second outer tube 6021 can rotate about the second inner tube 6022, and a second seal 6023 is disposed between the second outer tube 6021 and the second inner tube 6022. To ensure stable connection of the second outer tube 6021 to the second inner tube 6022, the second outer tube 6021 is integrally fastened to the end of the second inner tube 6022 by the second bolt 6024.

When the airplane wheel brake system is used, an inlet of the hose A1 is connected with a hydraulic system of an airplane body, an outlet of the hose B4 is connected with the airplane wheel brake system, and working media in a brake oil path are communicated to the airplane wheel brake system through a channel formed by the hose A1, the first adapter 2, the hard tube 3, the second adapter 6 and the hose B4. In the process that the A hose 1 makes bending motion along with the torsion arm 9 of the landing gear, and the B hose 4 makes pitching motion along with the frame 8, as the A hose 1 is rotationally connected with the first adapter 2 through the first rotary nozzle 201, and the B hose 4 is rotationally connected with the second adapter 6 through the second rotary nozzle 602, the A hose 1 can freely rotate relative to the first fixed nozzle 202 along with the first rotary nozzle 201 (namely, the first outer pipe 2011 rotates around the first inner pipe 2012 as an axis), and the B hose 4 can freely rotate relative to the second fixed nozzle 601 along with the second rotary nozzle 602 (namely, the second outer pipe 6021 rotates around the second inner pipe 6022 as an axis), so that the stress state of the brake hose is improved, and the service life of the landing gear brake hose is prolonged.

The above description is only for the preferred embodiment of the present application and should not be taken as limiting the present application in any way, and although the present application has been disclosed in the preferred embodiment, it is not intended to limit the present application, and those skilled in the art should understand that they can make various changes and modifications within the technical scope of the present application without departing from the scope of the present application, and therefore all the changes and modifications can be made within the technical scope of the present application.

Claims

1. A frame type undercarriage brake hose connecting structure comprises a buffer strut, a torque arm (9) and a frame (8), the torque arm is arranged on a piston rod (10) of the buffer strut through a first pin shaft (901), the bottom of the piston rod is hinged with the frame, characterized in that the torsion arm is provided with a hose A (1) which can bend along with the torsion arm, a hose B (4) which follows the frame to perform pitching motion is arranged on the frame, a first adapter (2) is fixedly arranged on the first pin shaft, a second adapter (6) is fixedly arranged on the piston rod at the position hinged with the frame, a hard tube (3) is connected between the first adapter and the second adapter, and the other end of the first adapter is rotatably connected with the hose A, and the other end of the second adapter is rotatably connected with the hose B (4).

2. A frame landing gear brake hose connection according to claim 1, wherein the a hose is fixedly mounted along the side of the torsion arm and the B hose is fixedly mounted parallel to the frame and perpendicular to the pitch axis of the frame.

3. A frame landing gear brake hose connection according to claim 1, wherein the first swivel joint comprises a first rotary nozzle (201) fixedly connected to the a hose, a first fixed nozzle (202) fixedly connected to one end of the hard tube, and a first fastening end (203) fixedly connected to the first pin.

4. A frame landing gear brake hose connection according to claim 1, wherein the second adapter comprises a second rotary nozzle (602), a second fixed nozzle (601) and a second fastening end (603), the second rotary nozzle being fixedly connected to the B hose, the second fixed nozzle being fixedly connected to one end of the hard tube, and the second fastening end being fixedly connected to the piston rod.