CN113532694B - Embedded temperature testing device for high-speed brake - Google Patents
Embedded temperature testing device for high-speed brake Download PDFInfo
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- CN113532694B CN113532694B CN202110829086.9A CN202110829086A CN113532694B CN 113532694 B CN113532694 B CN 113532694B CN 202110829086 A CN202110829086 A CN 202110829086A CN 113532694 B CN113532694 B CN 113532694B
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- 238000012360 testing method Methods 0.000 title claims abstract description 56
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 33
- 229910052802 copper Inorganic materials 0.000 claims abstract description 33
- 239000010949 copper Substances 0.000 claims abstract description 33
- 238000013461 design Methods 0.000 claims abstract description 14
- 239000000523 sample Substances 0.000 claims description 22
- 230000003750 conditioning effect Effects 0.000 claims description 7
- 230000006835 compression Effects 0.000 claims description 5
- 238000007906 compression Methods 0.000 claims description 5
- 230000009471 action Effects 0.000 claims description 4
- 238000004458 analytical method Methods 0.000 claims description 4
- 238000013016 damping Methods 0.000 claims description 4
- 238000004806 packaging method and process Methods 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 4
- 238000004146 energy storage Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 230000001143 conditioned effect Effects 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 8
- 230000005540 biological transmission Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 230000003993 interaction Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
- B60T17/18—Safety devices; Monitoring
- B60T17/22—Devices for monitoring or checking brake systems; Signal devices
Abstract
The invention belongs to the technical field of vehicle brake temperature testing, and particularly relates to an embedded temperature testing device for a high-speed brake. The embedded temperature testing device is used for testing the temperature of a high-speed brake, and the high-speed brake comprises: a testable support, a guard plate, a friction member, and a pressurizing device; the embedded temperature testing device comprises: a temperature measuring copper column, an embedded temperature sensor and an embedded acquisition device; based on the original brake structure, the invention selects the structure design and the sensing mode of the embedded temperature sensor, designs the embedded signal acquisition device and optimizes the embedded test structure of the brake body based on the sensing technology and the test technology. Therefore, the invention provides a design scheme of the embedded temperature testing device of the high-speed brake, which can monitor the service temperature of the brake in real time and effectively reduce the probability of high-temperature burning loss of the brake.
Description
Technical Field
The invention belongs to the technical field of vehicle brake temperature testing, and particularly relates to an embedded temperature testing device for a high-speed brake.
Background
Temperature is one of the important indicators of the reliability of the use of the brakes of a vehicle, which is directly related to the mobility and safety of the vehicle. Research shows that in the process of frequent braking or continuous slope lowering of heavy-load vehicles in high-maneuver running, the brake gathers more heat, if the heat cannot be timely dissipated in a short time, the continuous high temperature of the braking friction part can be caused, the friction coefficient of a friction pair is reduced, the braking moment is reduced, the rigidity of the supporting part is weakened, the braking failure of the vehicle, even the burning loss and locking of the vehicle are caused, and the running safety of the vehicle is seriously affected. Therefore, it is necessary to provide an embedded temperature testing device for a high-speed brake, which aims to solve the problems of high-temperature burning loss caused by unknown service temperature of a vehicle brake and reduced safety and reliability of the vehicle.
Disclosure of Invention
First, the technical problem to be solved
The invention aims to solve the technical problems that: aiming at the temperature field distribution characteristics of the novel high-speed brake and the heat conduction rule of each component, an embedded temperature testing device for the high-speed brake is developed based on a sensing technology and a testing technology, and the problems that the brake is damaged, burned and locked and the like due to the fact that the actual use temperature of the brake is unknown to influence the braking reliability are solved.
(II) technical scheme
In order to solve the above technical problems, the present invention provides an embedded temperature test device for a high-speed brake, the embedded temperature test device is used for performing a temperature test on the high-speed brake, and the high-speed brake includes: a supporting body 1, a guard plate 3, a friction part 4 and a pressurizing device 5 which can be tested;
wherein, a plurality of ladder-type temperature measuring holes are arranged on the testable support body 1 in a penetrating way; the guard plate 3 is arranged above the testable support body 1;
the friction part 4 and the pressurizing device 5 are arranged in the support body 1 which can be tested, when in braking, the pressurizing device 5 moves axially to eliminate a friction gap, the friction part 4 is pushed to a compression position, the vehicle is decelerated and stopped under the action of friction torque, and heat is conducted to the support body 1 which can be tested and the pressurizing device 5 by the friction part 4;
the embedded temperature testing device comprises: the temperature measuring copper column 2, the embedded temperature sensor 6 and the embedded acquisition device 7;
the temperature measuring copper column 2 is arranged in a temperature measuring hole of the testable support body 1, and the temperature measuring copper column and the testable support body are in interference fit to ensure the contact compactness;
the embedded temperature sensor 6 is fastened on the testable support body 1 through a hollow bolt thereof, and is tightly attached to the temperature measuring copper column 2 to realize heat conduction temperature test;
the embedded acquisition device 7 is arranged on the guard plate 3;
the embedded temperature sensor 6 measures the temperature signal of the testable support body 1 in real time and transmits the temperature signal to the embedded acquisition device 7, the embedded acquisition device 7 carries out conditioning analysis on the temperature signal, and the final result is transmitted to the driver display terminal in real time.
Wherein the embedded temperature sensor 6 comprises: a sensor housing, a hollow bolt 8, a spring 9 and a sensor probe 10;
the sensor shell is connected and fastened with the support body 1 through the hollow bolt 8, the spring 9 is sleeved on the hollow bolt 8, the other end of the spring 9 is connected with the sensor probe 10, the hollow bolt 8 pre-presses the spring 9, and the sensor probe 10 is tightly attached to the temperature measuring copper column 2, so that a good heat transfer effect is achieved.
Wherein, the outer surface of the sensor probe 10 is wrapped with metallic copper.
Wherein, the joint surface of the temperature measuring copper column 2 and the sensor probe 10 is a plane.
The structural design of the embedded acquisition device 7 depends on the structural characteristics of the brake, the structure of the embedded acquisition device is matched with the outline of the high-speed brake, and the embedded acquisition device 7 has enough heat dissipation space by adopting the design of the arc-shaped circuit board structure 11 and the arc-shaped packaging shell.
The embedded acquisition device 7 is fixed on the guard plate 3 through bolts, and a damping sleeve 12 is arranged at the fixing bolts, so that the embedded acquisition device 7 is prevented from being influenced by the temperature and vibration factors in the vehicle-mounted environment, and the vehicle-mounted environment adaptability is met.
Wherein, backplate 3 is used as stopper pressurization return backplate, still is used for installing, protection embedded collection system 7.
Wherein the testable support 1 is used as a brake friction or compression support structure.
The spring 9 in the embedded temperature sensor 6 is used as an energy storage pressing device, so that the sensor probe 10 is tightly matched with the temperature measuring copper column 2 and is connected and fastened with the high-speed brake through the hollow bolt 8.
The number of the embedded temperature sensors 6 is a plurality, and according to the actual use requirements of different brakes, all the temperature signals output by the embedded temperature sensors 6 are subjected to signal conditioning and transmission through a single set of embedded acquisition device 7.
(III) beneficial effects
Aiming at the temperature field distribution characteristics of the novel high-speed brake and the heat conduction rule of each component, the invention develops an embedded temperature testing device for the high-speed brake based on a sensing technology and a testing technology, and solves the problem that the brake reliability is affected by brake failure, burning loss, locking and the like caused by the fact that the actual use temperature of the brake is unknown.
Compared with the prior art, the technical scheme of the invention can realize the real-time detection of the brake temperature, and has the function of real-time interaction with the vehicle and the driver, and has great significance for improving the use reliability of the vehicle brake.
Drawings
FIG. 1 is a schematic diagram of a high-speed brake embedded temperature measurement device arrangement.
Fig. 2 is a schematic diagram of an embedded temperature sensor.
Fig. 3 is a schematic diagram of an embedded acquisition device.
Detailed Description
For the purposes of clarity, content, and advantages of the present invention, a detailed description of the embodiments of the present invention will be described in detail below with reference to the drawings and examples.
In order to solve the above technical problems, the present invention provides an embedded temperature testing device for a high-speed brake, as shown in fig. 1 to 3, the embedded temperature testing device is configured to perform a temperature test on the high-speed brake, and the high-speed brake includes: a supporting body 1, a guard plate 3, a friction part 4 and a pressurizing device 5 which can be tested;
wherein, a plurality of ladder-type temperature measuring holes are arranged on the testable support body 1 in a penetrating way; the guard plate 3 is arranged above the testable support body 1;
the friction part 4 and the pressurizing device 5 are arranged in the support body 1 which can be tested, when in braking, the pressurizing device 5 moves axially to eliminate a friction gap, the friction part 4 is pushed to a compression position, the vehicle is decelerated and stopped under the action of friction torque, and heat is conducted to the support body 1 which can be tested and the pressurizing device 5 by the friction part 4;
the embedded temperature testing device comprises: the temperature measuring copper column 2, the embedded temperature sensor 6 and the embedded acquisition device 7;
the temperature measuring copper column 2 is arranged in a temperature measuring hole of the testable support body 1, and the temperature measuring copper column and the testable support body are in interference fit to ensure the contact compactness;
the embedded temperature sensor 6 is fastened on the testable support body 1 through a hollow bolt thereof, and is tightly attached to the temperature measuring copper column 2 to realize heat conduction temperature test;
the embedded acquisition device 7 is arranged on the guard plate 3;
the embedded temperature sensor 6 measures the temperature signal of the testable support body 1 in real time and transmits the temperature signal to the embedded acquisition device 7, the embedded acquisition device 7 carries out conditioning analysis on the temperature signal, and the final result is transmitted to the driver display terminal in real time.
Wherein the embedded temperature sensor 6 comprises: a sensor housing, a hollow bolt 8, a spring 9 and a sensor probe 10;
the sensor shell is connected and fastened with the support body 1 through the hollow bolt 8, the spring 9 is sleeved on the hollow bolt 8, the other end of the spring 9 is connected with the sensor probe 10, the hollow bolt 8 pre-presses the spring 9, and the sensor probe 10 is tightly attached to the temperature measuring copper column 2, so that a good heat transfer effect is achieved.
Wherein, the outer surface of the sensor probe 10 is wrapped with metallic copper.
Wherein, the joint surface of the temperature measuring copper column 2 and the sensor probe 10 is a plane.
The structural design of the embedded acquisition device 7 depends on the structural characteristics of the brake, the structure of the embedded acquisition device is matched with the outline of the high-speed brake, and the embedded acquisition device 7 has enough heat dissipation space by adopting the design of the arc-shaped circuit board structure 11 and the arc-shaped packaging shell.
The embedded acquisition device 7 is fixed on the guard plate 3 through bolts, and a damping sleeve 12 is arranged at the fixing bolts, so that the embedded acquisition device 7 is prevented from being influenced by the temperature and vibration factors in the vehicle-mounted environment, and the vehicle-mounted environment adaptability is met.
Wherein, backplate 3 is used as stopper pressurization return backplate, still is used for installing, protection embedded collection system 7.
Wherein the testable support 1 is used as a brake friction or compression support structure.
The spring 9 in the embedded temperature sensor 6 is used as an energy storage pressing device, so that the sensor probe 10 is tightly matched with the temperature measuring copper column 2 and is connected and fastened with the high-speed brake through the hollow bolt 8.
The number of the embedded temperature sensors 6 is a plurality, and according to the actual use requirements of different brakes, all the temperature signals output by the embedded temperature sensors 6 are subjected to signal conditioning and transmission through a single set of embedded acquisition device 7.
Example 1
In this embodiment, the working environment of the existing high-speed brake is relatively high in temperature and relatively airtight, and after continuous braking, heat in the vicinity of the brake is rapidly accumulated, so that the temperature is high. The long-term use under the working condition can lead to the reduction of braking moment, and the braking failure and even burning loss of the vehicle. The embedded temperature testing device can detect and transmit the actual use temperature of the brake in real time, realize information interaction with the vehicle and a driver, and reduce the failure probability of the brake caused by high temperature by taking the obtained real-time data as a criterion of early warning and forced cooling time.
Referring to fig. 1, the present embodiment relates to a high-speed brake including: a supporting body 1, a guard plate 3, a friction part 4 and a pressurizing device 5 which can be tested; during braking, the pressurizing device 5 moves axially to eliminate the friction clearance, the friction part 4 is pushed to the pressing position, the vehicle is decelerated and stopped under the action of friction torque, and heat is conducted to the supporting body 1 and the pressurizing device 5 by the friction part 4.
The embedded temperature testing device provided by the embodiment comprises: the temperature measuring copper column 2, the embedded temperature sensor 6 and the embedded acquisition device 7. The temperature measuring copper column 2 is arranged on the testable supporting body 1, and the temperature measuring copper column and the testable supporting body are in interference fit to ensure the contact compactness; the embedded temperature sensor 6 is fastened on the testable support body 1 through a hollow bolt, and is tightly attached to the temperature measuring copper column 2 to realize heat conduction temperature test; the embedded acquisition device 7 is arranged on the guard plate 3, the embedded temperature sensor 6 measures the temperature signal of the support body 1 in real time and transmits the temperature signal to the embedded acquisition device 7, the embedded acquisition device 7 carries out conditioning analysis on the temperature signal, and the final result is transmitted to the display terminal of the driver in real time.
Referring to fig. 2, the embedded temperature sensor 6 includes: a sensor housing, a hollow bolt 8, a spring 9, and a sensor probe 10 wrapping metallic copper; the sensor shell is fixedly connected with the support body 1 through the hollow bolt 8, the spring 9 is sleeved on the hollow bolt 8, the other end of the spring 9 is connected with the sensor probe 10, the hollow bolt 8 pre-presses the spring 9, and the sensor probe 10 is tightly attached to the temperature measuring copper column 2 so as to achieve a good heat transfer effect; the joint surface of the temperature measuring copper column 2 and the sensor probe 10 is a plane.
Referring to fig. 3, the structural design of the embedded acquisition device 7 relies on the structural characteristics of the brake, and adopts the design of the arc-shaped circuit board structure 11 and the arc-shaped packaging shell, so that the embedded acquisition device 7 has enough heat dissipation space, and meanwhile, the damping sleeve 12 is added at the fixing bolt, thereby avoiding the influence of the factors of temperature and vibration of the embedded acquisition device 7 in the vehicle-mounted environment, and meeting the vehicle-mounted environment adaptability.
In the invention, the number of the embedded temperature sensors 6 is not limited to 1, and the temperature signals output by all the embedded temperature sensors 6 can be conditioned and transmitted through a single set of embedded acquisition device according to the actual use requirements of different brakes.
Example 2
The embodiment provides an embedded temperature testing device for a high-speed brake, which comprises a testable support body, an embedded temperature sensor and an embedded acquisition device, wherein a testable structure is designed on the brake support body, the embedded temperature sensor is installed, and the transient temperature of a brake friction element is directly measured. An embedded testing device matched with the outline of the brake is designed, and conditioning and transmission of temperature signals of the brake are realized.
The testable support structure is used for meeting embedded temperature test of the vehicle double-side brake.
The embedded temperature testing device comprises an embedded temperature sensor and an embedded acquisition device, and can realize real-time monitoring of the temperature of a vehicle brake.
In summary, the invention belongs to the technical field of vehicle brake temperature testing, and particularly relates to an embedded temperature testing device for a high-speed brake. The embedded temperature testing device is used for testing the temperature of a high-speed brake, and the high-speed brake comprises: a testable support, a guard plate, a friction member, and a pressurizing device; the embedded temperature testing device comprises: a temperature measuring copper column, an embedded temperature sensor and an embedded acquisition device; based on the original brake structure, the invention selects the structure design and the sensing mode of the embedded temperature sensor, designs the embedded signal acquisition device and optimizes the embedded test structure of the brake body based on the sensing technology and the test technology. Therefore, the invention provides a design scheme of the embedded temperature testing device of the high-speed brake, which can monitor the service temperature of the brake in real time and effectively reduce the probability of high-temperature burning loss of the brake.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present invention, and such modifications and variations should also be regarded as being within the scope of the invention.
Claims (9)
1. An embedded temperature testing device for a high-speed brake, wherein the embedded temperature testing device is used for performing temperature testing on the high-speed brake, and the high-speed brake comprises: a supporting body (1), a guard plate (3), a friction part (4) and a pressurizing device (5) which can be tested;
wherein, a plurality of ladder-type temperature measuring holes are arranged on the testable support body (1) in a penetrating way; the guard board (3) is arranged above the testable support body (1);
the friction part (4) and the pressurizing device (5) are arranged in the testable support body (1), when in braking, the pressurizing device (5) moves axially to eliminate friction clearance, the friction part (4) is pushed to a compression position, the vehicle is decelerated and stopped under the action of friction torque, and heat is conducted to the testable support body (1) and the pressurizing device (5) by the friction part (4);
the embedded temperature testing device comprises: the temperature measuring copper column (2), the embedded temperature sensor (6) and the embedded acquisition device (7);
the temperature measuring copper column (2) is arranged in a temperature measuring hole of the supporting body (1) which can be tested, and the temperature measuring copper column and the temperature measuring hole are in interference fit to ensure the contact compactness;
the embedded temperature sensor (6) is fastened on the testable support body (1) through a hollow bolt thereof, and is tightly attached to the temperature measuring copper column (2) to realize heat conduction temperature test;
the embedded acquisition device (7) is arranged on the guard board (3);
the embedded temperature sensor (6) measures temperature signals of the testable support body (1) in real time and transmits the temperature signals to the embedded acquisition device (7), the embedded acquisition device (7) carries out conditioning analysis on the temperature signals, and a final result is transmitted to the driver display terminal in real time;
wherein the embedded temperature sensor (6) comprises: the sensor comprises a sensor shell, a hollow bolt (8), a spring (9) and a sensor probe (10);
the sensor shell is connected and fastened with the support body (1) through the hollow bolt (8), the spring (9) is sleeved on the hollow bolt (8), the other end of the spring (9) is connected with the sensor probe (10), the hollow bolt (8) pre-presses the spring (9), and the sensor probe (10) is tightly attached to the temperature measuring copper column (2).
2. An embedded temperature testing device for a high-speed brake according to claim 1, wherein the sensor probe (10) is wrapped with metallic copper on its outer surface.
3. The embedded temperature testing device for the high-speed brake according to claim 1, wherein the joint surface of the temperature measuring copper column (2) and the sensor probe (10) is a plane.
4. The embedded temperature testing device for the high-speed brake according to claim 1, wherein the structural design of the embedded acquisition device (7) depends on the structural characteristics of the brake, the structure of the embedded temperature testing device is matched with the outline of the high-speed brake, and the design of an arc-shaped circuit board structure (11) and an arc-shaped packaging shell is adopted.
5. Embedded temperature testing device for high-speed brakes according to claim 4, characterized in that the embedded acquisition device (7) is fastened to the guard plate (3) by means of bolts, at which fastening bolts damping sleeves (12) are provided.
6. Embedded temperature testing device for high-speed brakes according to claim 1, characterized in that the shield (3) is used as a brake return-to-pressure shield and also for mounting and protecting the embedded acquisition device (7).
7. Embedded temperature testing device for high-speed brakes according to claim 1, characterized in that the testable support (1) is used as a brake friction or pressure support structure.
8. An embedded temperature testing device for a high-speed brake according to claim 1, characterized in that a spring (9) inside the embedded temperature sensor (6) is used as an energy storage pressing device, so that a sensor probe (10) is tightly matched with the temperature measuring copper column (2) and is connected and fastened with the high-speed brake through a hollow bolt (8).
9. The embedded temperature testing device for the high-speed brake according to claim 1, wherein the number of the embedded temperature sensors (6) is multiple, and temperature signals output by all the embedded temperature sensors (6) are conditioned and transmitted through a single set of embedded acquisition devices (7) according to actual use requirements of different brakes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110829086.9A CN113532694B (en) | 2021-07-22 | 2021-07-22 | Embedded temperature testing device for high-speed brake |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110829086.9A CN113532694B (en) | 2021-07-22 | 2021-07-22 | Embedded temperature testing device for high-speed brake |
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| Publication Number | Publication Date |
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| CN113532694A CN113532694A (en) | 2021-10-22 |
| CN113532694B true CN113532694B (en) | 2023-11-17 |
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| CN202110829086.9A Active CN113532694B (en) | 2021-07-22 | 2021-07-22 | Embedded temperature testing device for high-speed brake |
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| JPH04212028A (en) * | 1990-06-01 | 1992-08-03 | Fuji Electric Co Ltd | Temperature detector |
| US6001066A (en) * | 1997-06-03 | 1999-12-14 | Trutek, Inc. | Tympanic thermometer with modular sensing probe |
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| WO2016023682A1 (en) * | 2014-08-13 | 2016-02-18 | Siemens Ag Österreich | Rail vehicle having an air-conditioning system and having a friction brake |
| CN111562032A (en) * | 2020-06-03 | 2020-08-21 | 山东电工电气集团有限公司 | Combined electrical apparatus temperature monitoring method based on fiber bragg grating sensor |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114623946A (en) * | 2022-03-11 | 2022-06-14 | 苏州热工研究院有限公司 | Thermoelectric potential probe |
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2021
- 2021-07-22 CN CN202110829086.9A patent/CN113532694B/en active Active
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|---|---|---|---|---|
| JPH04212028A (en) * | 1990-06-01 | 1992-08-03 | Fuji Electric Co Ltd | Temperature detector |
| US6001066A (en) * | 1997-06-03 | 1999-12-14 | Trutek, Inc. | Tympanic thermometer with modular sensing probe |
| WO2014210583A1 (en) * | 2013-06-28 | 2014-12-31 | Prime Datum, Inc. | Load bearing, fan system with variable control |
| WO2016023682A1 (en) * | 2014-08-13 | 2016-02-18 | Siemens Ag Österreich | Rail vehicle having an air-conditioning system and having a friction brake |
| CN104627196A (en) * | 2015-02-05 | 2015-05-20 | 南车青岛四方机车车辆股份有限公司 | Bogie of high-speed railway vehicle |
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