CN211893629U

CN211893629U - Static disc assembly of aircraft wheel

Info

Publication number: CN211893629U
Application number: CN202020147905.2U
Authority: CN
Inventors: 张万顺; 邓倩; 娄金涛; 夏孟聪; 李硕
Original assignee: Xian Aviation Brake Technology Co Ltd
Current assignee: Xian Aviation Brake Technology Co Ltd
Priority date: 2020-01-30
Filing date: 2020-01-30
Publication date: 2020-11-10
Anticipated expiration: 2030-01-30

Abstract

A static disc assembly of an aircraft wheel comprises 1 static disc; the static disc comprises a friction disc, and a plurality of convex keys are uniformly distributed on the inner circumferential surface of the friction disc; it is characterized by also comprising 3 protective sheets; the protection plates are arc-shaped strips and are embedded in the protection plate mounting grooves on the inner arc surfaces of the convex keys; the protection sheet mounting groove is formed in the inner circular arc surface of each convex key and extends into a circular ring shape along the circumferential direction of the convex key; the center line of the mounting groove in the width direction is positioned on the symmetrical plane of the axial length of the convex key; the width of protection plate mounting groove be 3 ~ 5 mm. The invention changes the stress form of the static disc component, avoids the stress of the concave key groove of the static disc, prolongs the service life and the safety of the static disc component, can share the radial torque of the convex key of the brake shell through the matching use of the groove of the protection plate, avoids the static disc from being damaged by the stress of the groove of the static disc, and prolongs the service life of the static disc.

Description

Static disc assembly of aircraft wheel

Technical Field

The invention relates to the field of aircraft brake, in particular to a static disc assembly for aircraft wheel brake.

Background

The airplane brake wheel comprises a wheel component and a brake device, and the wheel component and the brake device are mounted on a main landing gear shaft of the airplane together. The airplane wheel assembly is mainly used for bearing the weight of the airplane and supporting the airplane; the brake device is mainly used for braking the airplane. The brake device mainly comprises a cylinder seat, a piston assembly, a brake shell, a pressing disc assembly, a movable disc assembly, a static disc, a bearing disc, a steel bearing disc and the like. The static disc is matched with the convex key of the brake shell through the key slot and is fixed on the aircraft landing gear. When the airplane is braked, brake hydraulic oil enters the cylinder seat under the action of brake pressure to push the piston to move axially, and the pressing disc presses the static disc, the pressure-bearing disc and the movable disc rotating along with the random wheel to generate friction torque so as to brake the airplane wheel.

The types of brake discs in the existing brake devices include: the steel brake disc component comprises: the friction part of the brake disc is made of powder metallurgy material, and the framework is made of steel material; carbon brake disc subassembly: the brake disc is formed by depositing carbon-carbon composite materials and is an integral body; the carbon-ceramic brake disc assembly is characterized in that the brake disc is formed by depositing a carbon-ceramic composite material and is an integral body.

Because the concave key groove of the static disc of the carbon-carbon composite material or the carbon-ceramic composite material needs to be matched with the convex key of the brake shell made of the steel material or the titanium alloy material, but the strength of the carbon-carbon composite material or the carbon-ceramic composite material is lower than that of the steel material or the titanium alloy material, under the condition that the key groove of the static disc is directly matched with the convex key of the brake shell to bear force, the surface of the key groove of the static disc is easy to damage or deform after being stressed for a long time, and the service life and the safety of the carbon brake disc are. When an airplane brakes, the friction of a brake disc can generate high temperature, and the key groove bears load for a long time at the high temperature, so that the damage and the deformation of the surface of the key groove of the fixed disc can be accelerated. Under the condition that the aircraft is overloaded, when the key slot bears excessive moment, the crushing phenomenon is more likely to occur.

Keywords were retrieved by the national intellectual Property office (http:// www.sipo.gov.cn) in the people's republic of China: the brake disc comprises a static disc, a static disc component, a brake pad, a brake disc, a carbon-ceramic brake disc, a carbon-carbon composite material, a carbon-ceramic composite material, an airplane wheel, a brake device, a brake, a Western aviation technology brake, Zhang Wanshun, Dangqian, a Roujin wave, summer clever and Lishuo. The related invention patents are as follows:

an aircraft carbon/ceramic brake device is provided in the invention creation of patent No. 201611200855.4, an aircraft brake device is provided in the invention creation of patent No. 201721276237.8, an aircraft brake device is provided in the invention creation of patent No. 201721255769.3, a brake device assembly of an aircraft main engine wheel is provided in the invention creation of patent No. 201620685578, and a main engine wheel brake device is provided in the invention creation of patent No. 201520069451.0. The brake static disc in the brake device is supported by carbon or carbon ceramic materials and is of an integral structure. The key groove of the brake static disc has no protection structure and is in direct contact stress with the brake shell.

In the invention with the application number of 201610037039.X, a U-shaped key force transmission device of a carbon/carbon brake disc of an airplane is provided. The brake disc body and the brake disc body are provided with concave grooves, and the outer edge of the brake disc body between two adjacent concave grooves is connected with a metal key clamp through a rivet. The technology protects the outer surfaces of the grooves and the convex keys of the brake disc, has higher requirements on the external dimensions of the grooves and the convex keys, and is not suitable for a static disc with a smaller inner diameter.

The invention with the application number of 201810426331.X provides an airplane carbon brake disc steel clamp. The brake disc comprises the first steel clamping piece, the second steel clamping piece and the rivet, the problem that the requirement of the size space required by mounting a common single steel clamp cannot be met due to the small inner diameter of the brake disc is solved, the convex key on the inner ring of the brake disc can be protected, the impact on the key groove is reduced, and the service life of the brake disc is prolonged. The technology is that a protective structure is arranged outside a brake disc, while the invention is that a reinforced protective structure is embedded inside the brake disc, the purposes are similar, but the structure is not similar.

Disclosure of Invention

The defect that a key groove is widened and crushed due to the fact that a static disc key groove is free of a protection structure and is in direct contact with a brake shell for a long time under stress in the prior art is overcome; and the defect that the inner diameter of the static disc is small and is not enough to install a single protection device on each key groove, the invention provides a static disc assembly of an aircraft wheel.

The invention comprises 1 static disc and 3 protective sheets; the static plate comprises a friction plate and a plurality of convex keys uniformly distributed on the inner circumferential surface of the friction plate; the protection plate is an arc strip and is embedded and fixed in the protection plate mounting groove on the inner arc surface of each convex key.

The protection sheet mounting groove is formed in the inner arc surface of each convex key and extends in a circular ring shape along the circumferential direction of the convex key. The center line of the width direction of the mounting groove is positioned on the symmetrical plane of the axial length of the convex key. The width of protection plate mounting groove be 3 ~ 5 mm.

The groove bottom surface of each protection sheet mounting groove is a concave arc surface and a convex arc surface which are smoothly connected into a circle, the top point of the concave arc surface corresponds to the central line of the width of the key groove of the static disc respectively, and the top point of each convex arc surface corresponds to the central line of the width of the convex key of the static disc respectively. The radius of the concave cambered surface is the same as that of the convex cambered surface.

The outer circumferential surface of the protection plate is a convex arc surface and a concave arc surface which are matched with the surface of the bottom of the protection plate mounting groove, so that the concave arc surface of each protection plate is attached to the convex arc surface of the bottom of the protection plate mounting groove, and the convex arc surface of each protection plate is attached to the concave arc surface of the bottom of the protection plate mounting groove; the inner circumferential surface of each protection sheet is uniformly provided with grooves, and each groove is positioned at each convex arc surface of the protection sheet, so that the center line of each groove in the width direction corresponds to the vertex of each convex arc surface. The width of the groove is 1-3 mm smaller than that of the key groove in the static disc.

The radius of the concave arc surface and the convex arc surface is 22-28 mm.

The inner radius of the protective sheet is the same as that of the static disc.

Rivet holes are distributed on two sides of the groove, and the rivet holes are in one-to-one correspondence with the rivet holes on the static disc.

Two through rivet holes are uniformly distributed on the surface of the convex key.

The invention can optimize the structure of the existing static disc assembly, change the stress form of the static disc assembly, avoid the stress of the concave key groove of the static disc, and increase the service life and the safety of the static disc assembly.

In order to facilitate the installation of the protection plates in the protection plate installation groove, the protection plates in the invention are 3 arc-shaped strips which are circumferentially trisected. The protection sheet is embedded in the protection sheet mounting groove. In order to avoid the stress on the wall of the groove of the static disc, the width of the groove is 1-3 mm smaller than that of the key groove on the static disc. Rivet holes are distributed on two sides of the groove, and the rivet holes are in one-to-one correspondence with the rivet holes on the static disc.

When the quiet dish subassembly of new construction and the cooperation of brake housing, the cooperation of the quiet dish concave keyway of carbon combined material or carbon pottery combined material together with the concave keyway of screening glass with the brake housing convex key cooperation of steel material or titanium alloy material, the quiet dish recess that can protection intensity be lower is used in the cooperation of screening glass recess, shares the radial moment of torsion of brake housing convex key in the use, avoids quiet dish recess atress and damages quiet dish, increases the life of quiet dish.

Compared with the prior art, the static disc component for braking the aircraft wheel provided by the invention has the following characteristics:

the novel static disc component can effectively reduce the static disc failure caused by excessive stress deformation and damage of the key groove, improve the use stability and safety of the static disc component and prolong the service life of the static brake disc by 60 percent.

Quiet dish subassembly increases the steel protection piece part that the keyway width slightly is less than quiet dish keyway width, and when cooperating with brake housing convex key, the protection piece keyway replaces quiet dish keyway atress, because the intensity of steel material is great than carbon, carbon pottery material, can avoid quiet dish keyway deformation in the use.

The steel screening glass of a week is connected with the convex arc face tangent to the concave arc face that quiet dish subassembly increases, and screening glass designs this structure, and the area of contact of screening glass and quiet dish that can increase increases 22% ~ 100% radial lifting surface, disperses and bears the radial force of part brake housing transmission, reduces the pressure of quiet dish keyway unilateral, has improved the atress condition of quiet dish subassembly.

The invention is to embed a reinforced protection structure in the brake disc, the size of a protection sheet can be adjusted according to the inner diameter of the static disc, and the brake disc has no similarity with the existing structure. Most of the existing static discs are integrally formed and made of carbon or carbon ceramic materials, and key grooves are not provided with protection structures and are in direct contact stress with a brake shell. The static disc component with the protection structure at the key groove is characterized in that the protection structure is arranged outside the brake disc, the requirement on the inner diameter of the static disc is high, and the small-size inner diameter is not suitable for use.

The unprotected static disc with the original structure and the static disc component are assembled into a brake device, a brake performance comparison test is carried out according to the requirements of a dynamic moment spectrum of GJB1184A-2010 general Specifications for aircraft wheels and brake devices, and 100 dynamic brake tests are respectively carried out at the initial stage, the middle stage and the limit stage of brake disc abrasion. After the test, the decomposition and inspection show that the unprotected key slot of the original structure static disc has the phenomenon of widening to different degrees, and the widening size is 0.8-1.4 mm; the size of the key groove of the static disc component of the invention is unchanged because the protection sheet bears and disperses the stress.

Drawings

FIG. 1 is a schematic structural view of a stationary disc assembly;

FIG. 2 is an isometric view of a stationary disc;

FIG. 3 is a cross-sectional view of the stationary platen, wherein a is a front view and b is a side view;

FIG. 4 is an isometric view of a protective sheet;

FIG. 5 is a front view of the protective sheet;

FIG. 6 is a static disc assembly installation schematic.

In the figure: 1. a stationary disc; 2. a protective sheet; 3. riveting; 4. a convex key; 5. a keyway.

Detailed Description

This embodiment is a stationary disc assembly for a brake of some type. As shown in fig. 1, the device comprises 1 static disc 1, three protective sheets 2 and 24 rivets 3. Wherein, the three protection plates 2 are uniformly distributed on the inner circumferential surface of the static disc 1, are embedded between convex keys on the inner circumferential surface of the static disc and are fixed by rivets 3.

The static disc 1 is made of carbon-carbon composite materials in the prior art, and the total weight is 3.5 kg; the protective sheet is 1Cr18Ni9Ti, and is subjected to surface treatment: and (5) passivating. The static plate comprises a friction plate and 9-15 convex keys. The said convex keys are uniformly distributed on the inner circumferential surface of the friction disk, and key slots are formed by the space between adjacent convex keys. The width of keyway is 13 ~ 18mm, and the degree of depth is 12 ~ 16 mm. In the embodiment, the outer diameter of the static disc is 412mm, the inner diameter of the static disc is 280mm, and the total thickness of the disc body is 22 mm; the number of the convex keys is 12; the width of the key groove is 16mm, and the depth is 14.5 mm.

In order to mount the protection sheet 2 on the inner circumferential surface of the static disc, a circumferential protection sheet mounting groove is processed on the inner arc surface of each convex key; each the width of protection plate mounting groove be 3 ~ 5 mm. The central line of each protecting sheet mounting groove in the width direction is positioned on the symmetrical plane of the axial length of the convex key.

The groove bottom surface of each protection sheet mounting groove is a concave arc surface and a convex arc surface which are in tangent connection with each other for a circle, so that the groove bottom surface is wavy, the top points of the concave arc surfaces respectively correspond to the central line of the width of the key groove of the static disc, and the top points of the convex arc surfaces respectively correspond to the central line of the width of the convex key of the static disc. The radius of the concave cambered surface is the same as that of the convex cambered surface, and the radius of the concave cambered surface is 25 mm. The centers of the concave arc surface and the convex arc surface are on a reference circle with the diameter of phi 325, and the reference circle is concentric with the center of the static disc. In the embodiment, the width of the protection sheet mounting groove is 3-5 mm; the radius of the concave arc surface and the convex arc surface is 22-28 mm.

The surface of the convex key is provided with two through rivet holes, the diameter of each rivet hole is 6mm, the distance between the two rivet holes is 32mm, and the two rivet holes are uniformly distributed on a reference circle with the circumference diameter of 270 mm.

The number of the protection plates 2 is 3, and the protection plates are all arc-shaped strips. The radius of this screening glass intrados with the radius of quiet dish is the same, and each the outer circular arc limit of screening glass also is continuous concave arc face and convex arc face, formed with the wavy tank bottom of screening glass mounting groove is the wavy gomphosis mutually to make the concave arc face of each screening glass laminate with the convex arc face of screening glass mounting groove tank bottom mutually, make the convex arc face of each screening glass laminate with the concave arc face of screening glass mounting groove tank bottom mutually.

The inner arc surface of the protection plate is evenly provided with grooves, and each groove is positioned at each convex arc surface of the protection plate, so that the center line of each groove in the width direction corresponds to the top point of each convex arc surface. The width of the groove is 1-3 mm smaller than that of the key groove in the static disc. Rivet holes are distributed on two sides of the groove, and the rivet holes are in one-to-one correspondence with the rivet holes on the static disc. In this embodiment, the width of the groove is 1mm smaller than the width of the key groove on the stationary disc.

When the installation, insert each screening glass respectively in the screening glass mounting groove of the interior arc surface of quiet dish convex key to make continuous concave arc face and convex arc face on each screening glass extrados and screening glass mounting groove tank bottom correspond the laminating one-to-one with convex arc face and concave arc face. And the protective plate is fixedly connected with the static disc through a rivet 3. The distance between the ends of two adjacent protection plates is 16-25 mm. In this embodiment, the distance between the ends of the two adjacent protective sheets is 20 mm.

The width of the groove on the protective plate is 1-3 mm smaller than that of the key groove on the static plate, so that the stress on the wall of the key groove on the static plate is avoided.

Claims

1. A static disc assembly of an aircraft wheel comprises 1 static disc; the static disc comprises a friction disc, and a plurality of convex keys are uniformly distributed on the inner circumferential surface of the friction disc; it is characterized by also comprising 3 protective sheets; the protection plates are arc-shaped strips and are embedded in the protection plate mounting grooves on the inner arc surfaces of the convex keys;

the protection sheet mounting groove is formed in the inner circular arc surface of each convex key and extends into a circular ring shape along the circumferential direction of the convex key; the center line of the mounting groove in the width direction is positioned on the symmetrical plane of the axial length of the convex key; the width of protection plate mounting groove be 3 ~ 5 mm.

2. The static disk assembly for an aircraft wheel according to claim 1, wherein the bottom surface of each of said protective sheet mounting grooves is a concave arc surface and a convex arc surface smoothly connected in one circle, and the apex of said concave arc surface is made to correspond to the center line of the width of said static disk key groove, and the apex of each of said convex arc surfaces is made to correspond to the center line of the width of said static disk key groove; the radius of the concave cambered surface is the same as that of the convex cambered surface.

3. The static disk assembly for an aircraft wheel according to claim 1, wherein the outer circumferential surface of the protective sheet is a convex arc surface and a concave arc surface which are fitted to the bottom surface of the protective sheet mounting groove, the concave arc surface of each protective sheet is made to abut against the convex arc surface of the bottom of the protective sheet mounting groove, and the convex arc surface of each protective sheet is made to abut against the concave arc surface of the bottom of the protective sheet mounting groove; the inner circumferential surface of each protection plate is uniformly provided with grooves, and each groove is positioned at each convex arc surface of the protection plate, so that the center line of each groove in the width direction corresponds to the vertex of each convex arc surface; the width of the groove is 1-3 mm smaller than that of the key groove in the static disc.

4. The static disk assembly of an aircraft wheel according to claim 2, characterized in that the radius of the concave arc surface and the convex arc surface is 22-28 mm.

5. A static disc assembly for an aircraft wheel according to claim 1 wherein the inboard radius of the protector piece is the same as the inboard radius of said static disc.

6. A static disc assembly for an aircraft wheel according to claim 3 wherein rivet holes are distributed on either side of said recess and each rivet hole corresponds one to a rivet hole on the static disc.