CN210479014U - Integral heat shield for airplane brake device - Google Patents
Integral heat shield for airplane brake device Download PDFInfo
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- CN210479014U CN210479014U CN201921056833.4U CN201921056833U CN210479014U CN 210479014 U CN210479014 U CN 210479014U CN 201921056833 U CN201921056833 U CN 201921056833U CN 210479014 U CN210479014 U CN 210479014U
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- brake shell
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Abstract
An integral heat shield for an aircraft brake assembly is sleeve-shaped and has an inner diameter equal to the outer diameter of the brake housing. The strip-shaped brake shell convex key groove is distributed on the circumferential surface of the integral heat shield, the brake shell convex key groove extends along the axial direction of the integral heat shield, and the notch of each brake shell convex key groove is positioned on the inner circumferential surface of the integral heat shield. The utility model discloses install in the outside of brake casing for keep apart the heat that the brake in-process produced, the heat radiation to brake casing and undercarriage shaft of the heat that reduces the brake and produce. The utility model discloses an it is integral, can reduce the heat radiation of brake heat to brake casing and undercarriage shaft to accomplish once to install the back riveting fixed that targets in place, improved the installation effectiveness.
Description
Technical Field
The invention relates to the field of airplane wheel braking, in particular to an integral heat shield for an airplane braking device.
Background
The friction between brake disks during aircraft braking generates heat, which can generate heat radiation to structural members around the carbon brake disk assembly in the brake assembly. Currently, more and more wheel brake suppliers consider designing thermal insulation devices in the brake assembly to thermally protect structural components, including devices that thermally protect the cylinder block assembly and devices that thermally protect the brake housing and landing gear axle during the design process. Generally speaking, the theoretically calculated temperature of the carbon brake disc assembly is the temperature of the central static disc of the carbon brake disc assembly, and actually, because the compact disc assembly in the carbon brake disc assembly is exposed to the outside and wind speed exists in the process of braking an airplane, the temperature of the compact disc assembly is far lower than that of the central static disc, and because a certain distance still exists between the cylinder block assembly and the compact disc assembly, when heat is transferred to the cylinder block assembly, the heat radiation to the cylinder block assembly is greatly reduced. The brake shell is used as a supporting structural member of the carbon brake disc assembly and is tightly matched with the carbon brake disc assembly, the interior of the brake shell is matched with an undercarriage axle, and various sensors are connected in the axle, so that the damage of heat generated by aircraft braking to the brake shell and the undercarriage axle is far greater than the influence on the cylinder seat assembly. At present, because the fit clearance between the brake shell and the carbon brake disc assembly is small, although the heat insulation effect of a large-sized heat insulation device is good, the problem of insufficient arrangement space exists, and therefore, a plurality of designs only carry out heat protection on the cylinder seat assembly, such as the patents with the application numbers of 201510319872.9 and 201510633824.7. The invention relates to an integral heat shield for a brake device, which is arranged between a brake shell and a carbon brake disc component and aims to reduce the influence of heat generated by braking on the brake shell and an undercarriage axle.
At present, in order to protect parts such as a brake shell, an undercarriage axle and the like, heat shields are required to be arranged inside and outside the brake shell. The current double-channel wide-body civil passenger plane operated in the airline, such as an A330 passenger plane, in order to reduce the heat radiation of brake heat to the shell and the wheel axle, a single-piece heat shield is designed and installed outside the brake shell, each single-piece heat shield is installed at the position between two convex keys of the brake shell and is fixed with the brake shell through rivets, but the single-piece heat shield can affect the heat insulation effect and is inconvenient to install.
Disclosure of Invention
In order to overcome the defects of influence on heat insulation effect and inconvenience in installation in the prior art, the invention provides an integral heat shield for an aircraft brake device.
The integral heat shield is sleeve-shaped, and the inner diameter of the integral heat shield is the same as the outer diameter of the brake shell. The strip-shaped brake shell convex key groove is distributed on the circumferential surface of the integral heat shield, the brake shell convex key groove extends along the axial direction of the integral heat shield, and the notch of each brake shell convex key groove is positioned on the inner circumferential surface of the integral heat shield.
The number of the brake shell convex key grooves is consistent with that of the brake shell convex keys. The length of the brake shell convex key groove is the same as that of the brake shell convex key, the width of the brake shell convex key groove is slightly larger than that of the brake shell convex key, the brake shell convex key groove and the brake shell convex key are in clearance fit, and the fit clearance of the fit surface is 0.1 mm.
And a heat shield temperature measuring hole is formed in the integral heat shield, and the position of the heat shield temperature measuring hole is coaxial with and in the same diameter as a brake shell temperature measuring hole in the brake shell.
Rivet holes are formed in the heat insulation plates between the adjacent convex key grooves of the brake shell and used for fixedly connecting the integral heat insulation screen with the brake shell.
The invention is arranged outside the brake shell and used for isolating heat generated in the braking process and reducing the heat radiation of the heat generated by braking to the brake shell and the undercarriage wheel axle.
According to the invention, after the convex key groove of the brake shell is aligned with the convex key on the brake shell, the integral heat shield is sleeved outside the shell and fixed through the rivet, and a gap is reserved between the static disc and the integral heat shield, so that the problem that brake heat directly generates heat radiation to the brake shell and an undercarriage axle or the single-chip heat shield is arranged outside the brake shell and has low efficiency due to no heat shield arranged outside the traditional brake shell is solved theoretically.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention theoretically solves the problem of low installation efficiency of the single-chip heat shield outside the traditional brake shell.
When the heat shield is externally installed on the traditional brake shell, the heat shield structure is mostly in a single-piece type, so that an operator needs to independently install each heat shield during installation and rivet and fix the heat shield for multiple times, the installation is time-consuming, the installation efficiency is low, the heat shield is in an integral type, one-time installation can be achieved, the heat shield is riveted and fixed again, and the installation efficiency is improved.
2. The invention can reduce the heat radiation of the brake heat to the brake shell and the undercarriage axle.
The invention is based on the wheel brake of a certain civil aircraft, wherein the material of a brake shell is 30CrMnSiA, and the central temperature of a brake disc after landing and braking can reach more than 600 ℃, at the moment, the specific heat capacity of the 30CrMnSiA material can be increased to 841.5 Kg.C from 473.1 Kg.C at room temperature, and the thermal conductivity is 28.67 m.C. If the heat shield is not installed on the brake shell, the heat can be directly applied to the brake shell, and then radiated to the wheel axle of the undercarriage, so that adverse effects are caused on the wheel axle. In the wheel assembly of the airplane type, 1Cr18Ni9Ti is generally used as a heat shield material, the material can bear high temperature, the thermal conductivity at 600 ℃ is 23.5m DEG C, and the thermal conductivity is lower than that of 30CrMnSiA at the same temperature, so that the material can be used for manufacturing a heat shield in a brake device, and the material has good heat resistance and can relieve partial heat radiation.
The following is a heat calculation for a brake assembly having an integral heat shield mounted to the brake housing.
The heat for the carbon brake disc assembly is calculated as follows:
T＝T0+ΔT (1)
in the formula:
t is the temperature of the brake disc assembly after braking;
T0the temperature of the brake disc component before braking is obtained;
and delta T is the temperature change of the brake disc assembly before and after braking.
In the formula:
b is the percentage of heat generated by friction of a brake disc absorbed by the tire in the braking process, and taking 0.9, namely the tire can absorb 90% of the braking heat;
ASthe kinetic energy absorbed by one brake of the airplane wheel is obtained by interpolation according to the heat absorbed by the specific heat capacity of each material at different temperatures；
CCarbon (C)The specific heat capacity of the carbon brake disc;
Gcarbon (C)The weight of the carbon brake disc;
CsteelIs the specific heat capacity of the steel clip;
GsteelIs the weight of the steel clip.
When the temperature of the carbon brake disc assembly is calculated, only the specific heat capacity and the heat quantity of the steel clamp are calculated, because the steel clamp and the carbon brake disc are in a matching relation, and the gap between the heat shield installed on the brake shell and the carbon brake static disc is small, so that the specific heat capacity and the weight of the heat shield can be similarly brought into calculation.
Before the present invention, the denominator in the formula (2) of the wheel brake device of a certain civil airplane is 25388.19J/DEG C, and the numerator is unchanged. After the integral heat shield provided by the invention is installed, the heat shield material is 1Cr18Ni9Ti, the specific heat capacity is 502J/(Kg.DEG C), the heat shield rivet number is 24, the material is 1Cr17Ni2, the specific heat capacity is 48J/(Kg.DEG C), and after the heat shield material is substituted into the formula (2), the denominator is 52790.59J/DEG C. It can be seen that the installation of the integral heat shield reduces the heat radiation to the brake housing and landing gear axle by more than 1.6% than before the installation of the integral heat shield. Meanwhile, compared with the single-piece heat shield in the prior art, the heat shield provided by the invention can be used for carrying out heat protection on the convex key of the brake shell.
Because the fit clearance of the original brake shell and the static disc is enough, the heat insulation screen cannot interfere with the static disc after the integral heat insulation screen is installed. Temperature measuring holes of the temperature sensor with the same hole diameter need to be processed at the corresponding positions of the integral heat shield, so that the temperature sensor can work normally after the integral heat shield is used.
Drawings
FIG. 1 is a schematic view of the assembly of the present invention with a brake housing;
FIG. 2 is a partial schematic view of FIG. 1;
FIG. 3 is a partial enlarged view of portion I of FIG. 2;
FIG. 4 is a schematic view of a modification to the brake housing;
fig. 5 is a schematic structural diagram of the present invention.
In the figure: 1. a brake housing; 2. an integral heat shield; 3. riveting; 4. a brake housing rivet hole; 5. a temperature measuring hole of the brake shell; 6. a brake housing raised key; 7. rivet holes; 8. a heat shield temperature measurement hole; 9. a brake housing boss key groove; 10. an insulating panel.
Detailed Description
The present embodiment is an integrated heat shield for a brake assembly.
The integral heat shield 2 is in a sleeve shape, and the inner diameter of the integral heat shield is the same as the outer diameter of the brake shell 1.
The circumferential surface of the integral heat shield is distributed with a brake shell convex key groove 9 which is processed by stamping, the brake shell convex key groove extends along the axial direction of the integral heat shield, and the notch of each brake shell convex key groove is positioned on the inner circumferential surface of the integral heat shield. The number of the convex key grooves of the brake shell is consistent with that of the convex keys 6 on the outer circumferential surface of the brake shell. The length of the brake shell convex key groove is the same as that of the brake shell convex key; the width of the convex key groove of the brake shell is slightly larger than that of the convex key of the brake shell, the width of the convex key groove of the brake shell and the width of the convex key of the brake shell are in clearance fit, and the fit clearance of the fit surface is 0.1 mm.
And a temperature sensor temperature measuring hole 8 is processed on the integral heat shield, the position of the heat shield temperature measuring hole corresponds to the position of a temperature sensor temperature measuring hole 5 on the brake shell, and the size of the heat shield temperature measuring hole is consistent with that of the temperature sensor temperature measuring hole on the brake shell.
And a heat insulation plate 10 is arranged between the adjacent convex key grooves of the brake shell. Rivet holes 7 are processed on each heat insulation plate and used for fixedly connecting the integral heat insulation screen with the brake shell.
For mounting the integral heat shield, a rivet hole 4 is also machined in the brake housing.
When the integrated heat shield is installed, the integrated heat shield is sleeved on the outer surface of the brake shell, and the convex keys on the brake shell are respectively embedded into the strip-shaped grooves of the integrated heat shield. The integral heat shield is fixedly connected with the brake shell through the rivet 3.
Claims (4)
1. An integral heat shield for an aircraft brake device is characterized in that the integral heat shield is sleeve-shaped, and the inner diameter of the integral heat shield is the same as the outer diameter of a brake shell; the strip-shaped brake shell convex key groove is distributed on the circumferential surface of the integral heat shield, the brake shell convex key groove extends along the axial direction of the integral heat shield, and the notch of each brake shell convex key groove is positioned on the inner circumferential surface of the integral heat shield.
2. The integrated heat shield for aircraft brakes according to claim 1 wherein the number of said brake housing raised key slots corresponds to the number of said brake housing raised keys; the length of the brake shell convex key groove is the same as that of the brake shell convex key, the width of the brake shell convex key groove is slightly larger than that of the brake shell convex key, the brake shell convex key groove and the brake shell convex key are in clearance fit, and the fit clearance of the fit surface is 0.1 mm.
3. The integrated heat shield for an aircraft brake rigging according to claim 1, wherein a heat shield temperature sensing hole is formed in said integrated heat shield and is positioned coaxially with a brake housing temperature sensing hole formed in said brake housing.
4. The integrated heat shield for aircraft brakes according to claim 1 wherein each heat shield between adjacent raised key slots of said brake housing has a rivet hole for securing the integrated heat shield to the brake housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921056833.4U CN210479014U (en) | 2019-07-08 | 2019-07-08 | Integral heat shield for airplane brake device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921056833.4U CN210479014U (en) | 2019-07-08 | 2019-07-08 | Integral heat shield for airplane brake device |
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| CN210479014U true CN210479014U (en) | 2020-05-08 |
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| CN201921056833.4U Active CN210479014U (en) | 2019-07-08 | 2019-07-08 | Integral heat shield for airplane brake device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110203380A (en) * | 2019-07-08 | 2019-09-06 | 西安航空制动科技有限公司 | A kind of integrated heat-insulation screen for aircraft brake system |
-
2019
- 2019-07-08 CN CN201921056833.4U patent/CN210479014U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110203380A (en) * | 2019-07-08 | 2019-09-06 | 西安航空制动科技有限公司 | A kind of integrated heat-insulation screen for aircraft brake system |
| CN110203380B (en) * | 2019-07-08 | 2024-02-23 | 西安航空制动科技有限公司 | Integral heat shield for aircraft brake device |
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