CN114348246A - Automatic brake device for folding undercarriage - Google Patents
Automatic brake device for folding undercarriage Download PDFInfo
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- CN114348246A CN114348246A CN202111545847.4A CN202111545847A CN114348246A CN 114348246 A CN114348246 A CN 114348246A CN 202111545847 A CN202111545847 A CN 202111545847A CN 114348246 A CN114348246 A CN 114348246A
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- automatic
- automatic brake
- actuating cylinder
- rocker arm
- brake
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Abstract
The invention relates to an automatic brake device for the retraction of an undercarriage, belonging to the field of design of hydraulic systems of airplanes. The device comprises an automatic brake actuating cylinder, a ribbed plate, a spring, a base, a rocker arm and an emergency brake pressure reducing valve; the rib plate is fixed on the automatic brake actuating cylinder; one end of the spring is connected with the rib plate, and the other end of the spring is connected with the rocker arm; the base is connected with the rocker arm; the emergency brake pressure reducing valve is positioned below the automatic brake actuating cylinder. By using the automatic brake device, the rotating airplane wheel can be braked and stopped in the retracting process of the airplane wheel, and meanwhile, the automatic brake pressure is relieved after the retraction switch of the undercarriage is retracted to the neutral position on the airplane wheel door, so that the safety of the airplane is ensured.
Description
Technical Field
The invention relates to an automatic brake device for the retraction of an undercarriage, belonging to the field of design of hydraulic systems of airplanes.
Background
In order to ensure that the tire cannot damage the circuit and the pipeline in the wheel cabin after the landing gear is put on, and simultaneously avoid the vibration caused by unbalanced rotation of the wheels on the landing gear, the aircraft brake system has the function of automatic brake when the landing gear is put on.
The wheel is folded and braked and stopped by installing a brake cushion block on the wheel cabin door, and when the wheel cabin door is folded and put in place, the brake cushion block and the tire rub to brake the wheel. This approach has some hysteresis because the wheel well doors typically retract after the landing gear is in place; and the friction between the brake cushion block and the tire aggravates the abrasion of the tire, and increases the maintenance workload of the crew.
The other mode for realizing the wheel retraction and brake function is that the wheel is braked by hydraulic drive, and the actuator cylinder is arranged on the undercarriage retraction pipeline and pushes the brake pressure reducing valve to brake the wheel retracted.
Disclosure of Invention
The invention aims to provide an automatic brake device for retracting an undercarriage, which can brake and stop a rotating airplane wheel in the retracting process by using the automatic brake device, and simultaneously, the automatic brake pressure is released after a retraction switch of the undercarriage is in a neutral position when a cabin door is retracted to a proper position, so that the safety of the airplane is ensured.
In order to achieve the purpose, the invention adopts the following technical scheme:
an automatic brake device for retracting an undercarriage comprises an automatic brake actuating cylinder, a rib plate, a spring, a base, a rocker arm and an emergency brake pressure reducing valve;
the rib plate is fixed on the automatic brake actuating cylinder;
one end of the spring is connected with the rib plate, and the other end of the spring is connected with the rocker arm;
the base is connected with the rocker arm;
the emergency brake pressure reducing valve is positioned below the automatic brake actuating cylinder.
Furthermore, one end of a piston rod in the automatic brake actuating cylinder is propped against the upper side surface of the rocker arm.
Furthermore, one end of the automatic brake actuating cylinder is a nozzle which is used for connecting a take-up pipeline of the landing gear; the other end of the automatic brake actuating cylinder is provided with an adjusting screw for adjusting the extension length of the piston rod.
Furthermore, the adjusting screw is in threaded connection with the piston rod.
Furthermore, a mandril in the emergency brake pressure reducing valve props against the lower side surface of the rocker arm.
Furthermore, the automatic brake actuating cylinder is internally provided with high-pressure oil.
Further, the automatic brake device is installed on the floor of the rear cabin of the airplane.
After the undercarriage starts to be retracted, high-pressure oil enters the automatic brake actuating cylinder through an undercarriage retraction pipeline and pushes the piston rod to extend outwards; the piston rod extends out to overcome the resistance of the spring to push the rocker arm to deflect, so that the ejector rod of the emergency brake pressure reducing valve is compressed, and the pressure of the emergency pressure supply system enters the brake oil cylinder through the emergency brake pressure reducing valve to brake the wheel rotating at high speed. When the wheel cabin door is retracted to a proper position, the extension and retraction switch of the undercarriage returns to a neutral position, the high-pressure oil of the automatic brake actuating cylinder flows back to the oil tank for pressure relief, the automatic brake actuating cylinder, the rocker arm and the ejector rod of the emergency brake pressure reducing valve are hooked to the initial position under the action of the spring force, the brake oil cylinder is communicated with the hydraulic oil tank on the airplane, and the automatic brake pressure is relieved.
Drawings
FIG. 1 is an assembly view of the automatic brake assembly with the landing gear retracted;
in the figure: 1. an automatic brake actuator cylinder; 2. a rib plate; 3. a spring; 4. a base; 5. a rocker arm; 6. emergency brake pressure reducing valve.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
An automatic brake device for folding an undercarriage comprises an automatic brake actuating cylinder 1, a ribbed plate 2, a spring 3, a base 4, a rocker arm 5 and an emergency brake pressure reducing valve 6;
the ribbed plate 2 is fixed on the automatic brake actuating cylinder 1;
one end of the spring 3 is connected with the ribbed plate 2, and the other end of the spring 3 is connected with the rocker arm 5;
the base 4 is connected with the rocker arm 5;
the emergency brake pressure reducing valve 6 is positioned below the automatic brake actuating cylinder 1.
Further, one end of a piston rod 11 in the automatic brake actuator cylinder 1 abuts against the upper side surface of the rocker arm 5.
Furthermore, one end of the automatic brake actuating cylinder 1 is provided with a nozzle 12 which is used for connecting a retraction pipeline of the landing gear; the other end of the automatic brake actuator cylinder 1 is provided with an adjusting screw 13 for adjusting the extension length of the piston rod 11.
Further, an adjusting screw 13 is threadedly coupled to the piston rod 11.
Further, a mandril 61 in the emergency brake pressure reducing valve 6 is propped against the lower side surface of the rocker arm 5.
Furthermore, the automatic brake actuating cylinder 1 is filled with high-pressure oil.
Further, the automatic brake device is installed on the floor of the rear cabin of the airplane.
After the undercarriage starts to be retracted, high-pressure oil enters the automatic brake actuating cylinder through an undercarriage retraction pipeline and pushes the piston rod to extend outwards; the piston rod extends out to overcome the resistance of the spring to push the rocker arm to deflect, so that the ejector rod of the emergency brake pressure reducing valve is compressed, and the pressure of the emergency pressure supply system enters the brake oil cylinder through the emergency brake pressure reducing valve to brake the wheel rotating at high speed. When the wheel cabin door is retracted to a proper position, the extension and retraction switch of the undercarriage returns to a neutral position, the high-pressure oil of the automatic brake actuating cylinder flows back to the oil tank for pressure relief, the automatic brake actuating cylinder, the rocker arm and the ejector rod of the emergency brake pressure reducing valve are hooked to the initial position under the action of the spring force, the brake oil cylinder is communicated with the hydraulic oil tank on the airplane, and the automatic brake pressure is relieved.
The automatic brake device on the undercarriage is used for pushing the rocker arm to compress the ejector rod of the emergency brake pressure reducing valve through the automatic brake actuating cylinder to realize the automatic brake function, and the output pressure of the emergency brake pressure reducing valve is in direct proportion to the compression amount of the ejector rod, so that the motion stroke of the piston rod of the automatic brake actuating cylinder can be calculated according to the automatic brake pressure and the motion transmission ratio of the rocker arm. And the tail end of the piston rod is provided with an adjusting screw, so that the extension amount of the piston rod can be further adjusted, and finally, the automatic braking pressure is ensured to meet the requirement of the use requirement range of the system.
While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and variations may be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The utility model provides an automatic brake equipment is received to undercarriage which characterized in that: the device comprises an automatic brake actuating cylinder (1), a ribbed plate (2), a spring (3), a base (4), a rocker arm (5) and an emergency brake pressure reducing valve (6);
the rib plate (2) is fixed on the automatic brake actuating cylinder (1);
one end of the spring (3) is connected with the rib plate (2), and the other end of the spring (3) is connected with the rocker arm (5);
the base (4) is connected with the rocker arm (5);
the emergency brake pressure reducing valve (6) is positioned below the automatic brake actuating cylinder (1).
2. An automatic landing gear retraction brake device according to claim 1, wherein: one end of a piston rod (11) in the automatic brake actuating cylinder (1) is propped against the upper side surface of the rocker arm (5).
3. An automatic landing gear retraction brake device according to claim 2, wherein: one end of the automatic brake actuating cylinder (1) is a nozzle (12) which is used for connecting a take-up pipeline of the landing gear; the other end of the automatic brake actuating cylinder (1) is provided with an adjusting screw (13) for adjusting the extension length of the piston rod (11).
4. An automatic landing gear retraction brake device according to claim 3, wherein: the adjusting screw (13) is in threaded connection with the piston rod (11).
5. An automatic landing gear retraction brake device according to claim 1, wherein: an ejector rod (61) in the emergency brake pressure reducing valve (6) is abutted against the lower side surface of the rocker arm (5).
6. An automatic landing gear retraction brake device according to claim 1, wherein: high-pressure oil is filled in the automatic brake actuating cylinder (1).
7. An automatic landing gear retraction brake device according to claim 1, wherein: the automatic brake device is arranged on the floor of the rear cabin of the airplane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111545847.4A CN114348246A (en) | 2021-12-17 | 2021-12-17 | Automatic brake device for folding undercarriage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111545847.4A CN114348246A (en) | 2021-12-17 | 2021-12-17 | Automatic brake device for folding undercarriage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114348246A true CN114348246A (en) | 2022-04-15 |
Family
ID=81098684
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111545847.4A Pending CN114348246A (en) | 2021-12-17 | 2021-12-17 | Automatic brake device for folding undercarriage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114348246A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB407677A (en) * | 1932-09-15 | 1934-03-15 | George Geach Parnall | Improvements in or relating to hydraulically operated brakes |
| GB705233A (en) * | 1951-09-28 | 1954-03-10 | Wingfoot Corp | Improvement in anti-skid mechanism for master cylinder operated brake |
| GB1283725A (en) * | 1968-10-23 | 1972-08-02 | Dba Sa | Brake control means |
| CN201010043Y (en) * | 2007-03-20 | 2008-01-23 | 哈尔滨飞机工业集团有限责任公司 | Automatic braking mechanism of airplane wheel in the air |
| CN104986154A (en) * | 2015-06-03 | 2015-10-21 | 西安航空制动科技有限公司 | Brake valve assembly |
| CN108146621A (en) * | 2017-12-29 | 2018-06-12 | 中国科学院工程热物理研究所 | A kind of unmanned plane brake control system based on servo-hydraulic transmission |
| CN109334959A (en) * | 2018-09-28 | 2019-02-15 | 湖南山河科技股份有限公司 | A kind of aircraft brake control system and method |
| CN213017567U (en) * | 2020-07-08 | 2021-04-20 | 西安航空制动科技有限公司 | Cam assembly and cam control mechanism of emergency brake |
-
2021
- 2021-12-17 CN CN202111545847.4A patent/CN114348246A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB407677A (en) * | 1932-09-15 | 1934-03-15 | George Geach Parnall | Improvements in or relating to hydraulically operated brakes |
| GB705233A (en) * | 1951-09-28 | 1954-03-10 | Wingfoot Corp | Improvement in anti-skid mechanism for master cylinder operated brake |
| GB1283725A (en) * | 1968-10-23 | 1972-08-02 | Dba Sa | Brake control means |
| CN201010043Y (en) * | 2007-03-20 | 2008-01-23 | 哈尔滨飞机工业集团有限责任公司 | Automatic braking mechanism of airplane wheel in the air |
| CN104986154A (en) * | 2015-06-03 | 2015-10-21 | 西安航空制动科技有限公司 | Brake valve assembly |
| CN108146621A (en) * | 2017-12-29 | 2018-06-12 | 中国科学院工程热物理研究所 | A kind of unmanned plane brake control system based on servo-hydraulic transmission |
| CN109334959A (en) * | 2018-09-28 | 2019-02-15 | 湖南山河科技股份有限公司 | A kind of aircraft brake control system and method |
| CN213017567U (en) * | 2020-07-08 | 2021-04-20 | 西安航空制动科技有限公司 | Cam assembly and cam control mechanism of emergency brake |
Non-Patent Citations (1)
| Title |
|---|
| 蒋远远;江德松;孙伟;: "某型飞机起落架控制***的优化", 绿色科技, no. 08, pages 238 - 240 * |
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