CN113665840A - Jacking device for nose landing gear of airplane - Google Patents
Jacking device for nose landing gear of airplane Download PDFInfo
- Publication number
- CN113665840A CN113665840A CN202010412377.3A CN202010412377A CN113665840A CN 113665840 A CN113665840 A CN 113665840A CN 202010412377 A CN202010412377 A CN 202010412377A CN 113665840 A CN113665840 A CN 113665840A
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- China
- Prior art keywords
- landing gear
- actuator
- top plate
- nose landing
- jack
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64F—GROUND OR AIRCRAFT-CARRIER-DECK INSTALLATIONS SPECIALLY ADAPTED FOR USE IN CONNECTION WITH AIRCRAFT; DESIGNING, MANUFACTURING, ASSEMBLING, CLEANING, MAINTAINING OR REPAIRING AIRCRAFT, NOT OTHERWISE PROVIDED FOR; HANDLING, TRANSPORTING, TESTING OR INSPECTING AIRCRAFT COMPONENTS, NOT OTHERWISE PROVIDED FOR
- B64F5/00—Designing, manufacturing, assembling, cleaning, maintaining or repairing aircraft, not otherwise provided for; Handling, transporting, testing or inspecting aircraft components, not otherwise provided for
- B64F5/60—Testing or inspecting aircraft components or systems
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T50/00—Aeronautics or air transport
- Y02T50/40—Weight reduction
Abstract
The utility model provides an aircraft nose landing gear jacking device, contains roof subassembly, mounting disc, jack-up actuator and base, the roof subassembly pass through bearing swing joint at the upper surface of mounting disc, the upper surface of roof subassembly is parallel with the mounting disc, the relative mounting disc of roof subassembly can the horizontal rotation, the upper end at the jack-up actuator is connected to the mounting disc, the lower extreme of jack-up actuator is fixed on the base, has solved during aircraft nose wheel turns the experiment, nose landing gear jacking device bears too big turn moment of torsion, the problem of tire hard friction.
Description
Technical Field
The invention belongs to the technical field of aviation tests, and further relates to ground equipment for testing a nose landing gear of an airplane, in particular to a jacking device for the nose landing gear of the airplane.
Background
The turning test of the front wheel of the airplane needs to be carried out on a test bed such as an iron bird stand, the nose landing gear of the airplane is installed on the test bed, the front tire is at a certain distance from the ground, and the nose landing gear is in a full-extension state. The nose landing gear in the fully extended state cannot perform the turning operation because the ground signal of the nose landing gear is not available. Therefore, in order to perform a nose wheel turning test on a test bed such as an iron bird stand, a nose landing gear jacking device is required to be adopted, a jacking actuator pushes a top plate assembly to move upwards, so that the nose landing gear is in a compressed state, a ground state is simulated, a ground signal of the nose landing gear is obtained, turning operation can be performed, and the nose wheel turning tests are completed. The nose landing gear jacking device becomes one of necessary and important test equipment to be considered for test benches such as an iron bird bench.
At present, the jacking device of the nose landing gear in China is in a form of fixedly mounting a top plate assembly, a jacking actuator and a guide post, and the top plate assembly in the form can only move up and down and cannot rotate. This form of nose gear jacking arrangement has three significant disadvantages. 1) The turning torque is transmitted to the nose gear jack. When the front wheel of the airplane is turned, a large turning torque can be generated along the front landing gear buffer strut. If the nose landing gear jacking device adopts a mode that the top plate assembly is fixedly connected with the guide column, the turning torque can be transmitted to the whole nose landing gear jacking device through the top plate assembly and the guide column. Under the action of the torque, the jacking device of the nose landing gear can shift and deflect, which hinders the front wheel turning test and can cause safety accidents. 2) The wear of the tire before acceleration. Because the nose landing gear installed on test benches such as the iron bird stand can not move, the front tire can not rotate, if the nose landing gear jacking device top plate assembly can not rotate, hard friction can be generated between the tire and the top plate assembly when a turning test is carried out. This, like turning operations when the aircraft is at a standstill, can cause severe wear on the tires. The aircraft does not allow this operation under normal conditions. To reduce friction between the front tire and the top plate assembly, grease is typically applied to the top plate assembly, but grease is highly corrosive to rubber and also accelerates the aging and wear of the front tire. 3) The nose landing gear jack-up device is not very versatile. At present, on different test racks such as an iron bird stand, an undercarriage test stand and the like in China, a nose undercarriage jacking device is developed with each test rack in a matched mode, the nose undercarriage jacking device cannot be applied to different test racks, and the nose undercarriage jacking device does not need a universal wheel assembly and cannot move.
Disclosure of Invention
According to the requirements of aircraft development tests and the defects of the prior art, the invention aims to provide an aircraft nose landing gear jacking device.
The utility model provides an aircraft nose landing gear jacking device, contains roof subassembly, mounting disc, jack-up actuator and base, its characterized in that, the roof subassembly pass through bearing swing joint at the upper surface of mounting disc, the upper surface of roof subassembly is parallel with the mounting disc, the relative mounting disc of roof subassembly can the horizontal rotation, the upper end at the jack-up actuator is connected to the mounting disc, the lower extreme of jack-up actuator is fixed on the base.
The optimized top plate component comprises a top plate and a positioning shaft, wherein the top plate is a circular flat plate, a connecting hole matched with the positioning shaft is formed in the center of the top plate, the positioning shaft is a step shaft, the upper end of the positioning shaft is used for being connected with the top plate, a tapered roller bearing can be externally connected to the middle of the positioning shaft, a sliding bearing can be externally connected to the lower portion of the positioning shaft, a protruding step hole is formed in the center of the upper surface of the mounting plate, and the step hole is matched with the outer diameters of the tapered roller bearing and the sliding bearing.
Preferably, the force application point at the upper end of the jacking actuator is positioned at the center of the lower surface of the mounting plate, so that the centers of the top plate assembly and the mounting plate and the force application center line of the jacking actuator are kept coincident.
The preferred slide bearing is interference fit with the mounting disc, and the slide bearing is clearance fit with the top plate assembly positioning shaft.
The upper surface of the top plate is preferably provided with a cross center marking. The cross center marking is also the center marking of the jacking device of the nose landing gear of the airplane.
The lower surface center at the mounting disc is fixed to preferred jack-up actuator upper end, and the jack-up actuator lower extreme is fixed in the center of base, in addition around the jack-up actuator, and a plurality of guide posts parallel with the actuator are fixed on the base in addition, and the corresponding position at the mounting disc lower surface is fixed to the upper end of guide post.
Preferably, the base is also fixed with a universal wheel assembly.
The invention has the following beneficial effects: 1) the top plate assembly can rotate along the center of the jacking device through the tapered roller bearing and the sliding bearing. Through the design, the problems that the jacking device of the nose landing gear bears excessive turning torque and hard friction of tires in a nose wheel turning test are successfully solved. The problems of displacement, deflection and easy abrasion of tires of the jacking device of the nose landing gear do not occur. 2) The nose landing gear jacking device is provided with the universal wheel assembly on the base, and can be applied to test occasions such as an iron bird test stand, a nose wheel turning test stand, an airplane ground nose wheel turning test and the like. 3) The jacking device for the nose landing gear of the airplane saves the development cost to the maximum extent, is good in universality, flexible in design and convenient to realize, and has high popularization value in aviation industry tests.
The present application is described in further detail below with reference to the accompanying drawings of embodiments.
Drawings
Fig. 1 is a schematic view of an aircraft nose landing gear jack assembly.
Fig. 2 is a schematic view of the top plate assembly.
Fig. 3 is a schematic view of the structure of the mounting plate.
FIG. 4 is a schematic view of the connection of the top plate assembly to the arrangement.
Fig. 5 is a schematic view of the connection position of the base and the jacking device.
Fig. 6 is a schematic diagram of the use state of the nose landing gear jacking device of the airplane.
The numbering in the figures illustrates: the airplane front tire assembly comprises a top plate assembly 1, a tapered roller bearing 2, a sliding bearing 3, a mounting plate 4, a guide column 5, a jacking actuator 6, a universal wheel assembly 7, a base 8, a top plate 9, a positioning shaft 10, a connecting piece 11, a connecting hole 12, a cross center marking line 13, a step hole 14, a mounting seat 15 and an airplane front tire 16.
Detailed Description
Referring to the accompanying drawings, the jacking device for the nose landing gear of the airplane comprises a top plate assembly 1, a mounting plate 4, a jacking actuator 6 and a base 8, and is characterized in that the top plate assembly 1 is movably connected to the upper surface of the mounting plate 4 through a bearing, the upper surface of the top plate assembly 1 is parallel to the mounting plate 4, the top plate assembly 1 can horizontally rotate relative to the mounting plate 4, the mounting plate 4 is connected to the upper end of the jacking device, and the lower end of the jacking actuator 6 is fixed on the base 8.
In use, the roof panel assembly 1 is used to achieve a nose gear jack-up function by lifting the aircraft nose tyre 16. When the jacking device of the nose landing gear works, the jacking device needs to be adjusted to be under a front tire, so that the center line of the nose landing gear is overlapped with the cross center marking on the surface of the top plate, and the uniform stress of the top plate assembly 1 is ensured.
The top plate assembly 1 comprises a top plate 9 and a positioning shaft 10, wherein the top plate 9 is a circular flat plate, in the implementation, the diameter of the top plate 9 is related to the front wheel track of the airplane, and the diameter of the top plate 9 is not less than twice the front wheel track. The thickness of the top plate should be no less than 20 mm. There is connecting hole 12 with location axle matching in the center of roof, location axle 10 be a step axle, the upper end of location axle is passed through connecting piece 11 and is connected with roof 9, the middle part of location axle 10 can external a tapered roller bearing 2, tapered roller bearing 2 installs between roof subassembly 1 and mounting disc 4, the tapered roller bearing outer lane is installed in the step hole of mounting disc 4, the inner circle is installed in the middle part of roof subassembly location axle 10. The tapered roller bearing 2 is used for realizing free rotation of the top plate assembly 1, and when the nose landing gear turns, the top plate assembly 1 rotates together with a front tire, so that the problems that the nose landing gear jacks a device to shift and deflect, the tire is excessively worn and the like when the nose landing gear turns are avoided. The lower part of the positioning shaft 10 can be externally connected with a sliding bearing 3, the sliding bearing 3 is used for keeping the top plate component 1 in a horizontal posture all the time, free rotation of the top plate component 1 is guaranteed, and the top plate component 1 can be guaranteed to be in a horizontal position all the time when uneven stress or unilateral stress of the top plate component 1 is avoided.
The center of the upper surface of the mounting plate 4 is provided with a protruded stepped hole 14, and the stepped hole 14 is matched with the outer diameters of the tapered roller bearing 2 and the sliding bearing 3. The sliding bearing 3 and the mounting disc 4 are in interference fit, and the sliding bearing 3 and the positioning shaft 10 of the top plate component 1 are in clearance fit. In practice, the mounting plate 4 is a nose gear jack mounting interface. The outer ring of the tapered roller bearing 2 and the sliding bearing 3 are fixedly arranged on the mounting disc 4 through the step hole 14, the top plate assembly 1 is further arranged, and the guide column 5 and the jacking actuator 6 are arranged below the mounting disc 4. The mounting disc 4 adopts an integral machining process for improving the bearing performance of the mounting disc.
The upper end of the jacking actuator 6, namely the end of the exposed side of the piston rod, is fixed on the mounting seat 15 on the lower surface of the mounting disc 4 through threads, and the lower end is fixed on the base 8 through screws. The force application point at the upper end of the jacking actuator 6 is positioned at the center of the lower surface of the mounting plate 4, so that the centers of the top plate assembly 1 and the mounting plate 4 and the force application center line of the jacking actuator 6 are kept coincident.
In practice, the effective stroke of the jacking actuators 6 should be no less than 200 mm to ensure that the nose gear cam centering mechanism is fully disengaged when the roof plate assembly 1 pushes the aircraft nose tires 16 up and to ensure that the nose gear is fully compressed to generate the ground signal. The movement of the jacking actuator 6 is controlled by a hydraulic servo valve, and after the top plate assembly 1 is lifted to a required position, a hydraulic oil circuit is closed through the hydraulic servo valve, so that the top plate assembly 1 is kept at the required position.
6 upper ends of jack-up actuator fix at the lower surface center of mounting disc 4, 6 lower extremes of jack-up actuator fix at the center of base 8, around jack-up actuator 6 in addition, a plurality of guide posts 5 parallel with the actuator are fixed on base 8, the corresponding position at the lower surface of mounting disc 4 is fixed to the upper end of guide post 5. The guide posts of the embodiment are three groups, are uniformly arranged around the jacking actuator 6 at 120 degrees, and ensure that the top plate assembly 1 and the mounting disc 4 move up and down along the direction of the central line of the guide post 5. Three sets of guide posts 5 are all connected between the mounting plate 4 and the base 8 through bolts.
The base 8 is a supporting base of the nose landing gear jacking device, and is provided with a guide column 5, a jacking actuator 6 and a universal wheel assembly 7. The universal wheel assembly 7 is mounted on the base 8 and is used for ensuring the free movement of the nose landing gear jacking device. The universal wheel assemblies 7 are provided with three groups which are uniformly arranged around the jacking actuator 6 at 120 degrees, so that the uniform stress is ensured when the jacking device of the nose landing gear moves. The three groups of universal wheel assemblies 7 are fixed on the base 8 through welding. The universal wheel assembly 7 is positioned on the outermost side of the whole device to ensure the stability of the nose landing gear jacking device during movement.
Claims (7)
1. The utility model provides an aircraft nose landing gear jacking device, contains roof subassembly, mounting disc, jack-up actuator and base, its characterized in that, the roof subassembly pass through bearing swing joint at the upper surface of mounting disc, the upper surface of roof subassembly is parallel with the mounting disc, the relative mounting disc of roof subassembly can the horizontal rotation, the upper end at the jack-up actuator is connected to the mounting disc, the lower extreme of jack-up actuator is fixed on the base.
2. An aircraft nose landing gear jacking device as claimed in claim 1, wherein said top plate assembly includes a top plate and a positioning shaft, said top plate is a circular flat plate, the center of the top plate has a connecting hole matched with the positioning shaft, said positioning shaft is a stepped shaft, the upper end of the positioning shaft is used for connecting with the top plate, the middle part of the positioning shaft can be externally connected with a tapered roller bearing, the lower part of the positioning shaft can be externally connected with a sliding bearing, the center of the upper surface of said mounting plate has a protruded stepped hole matched with the outer diameters of said tapered roller bearing and sliding bearing.
3. An aircraft nose landing gear jack according to claim 1 or claim 2, wherein the point of application of the upper end of the jack actuator is located centrally on the lower surface of the mounting plate, such that the centre of the top plate assembly and the mounting plate is coincident with the centre line of application of the jack actuator.
4. An aircraft nose landing gear jacking device according to claim 3 wherein the sliding bearing is an interference fit with the mounting plate and the sliding bearing is a clearance fit with the roof assembly locating shaft.
5. An aircraft nose landing gear jacking device according to claim 4 wherein the upper surface of the top plate is provided with a cross centre marking.
6. An aircraft nose landing gear jacking device as claimed in claim 1, wherein the upper end of the jacking actuator is fixed to the centre of the lower surface of the mounting plate, the lower end of the jacking actuator is fixed to the centre of the base and surrounds the jacking actuator, and a plurality of guide posts parallel to the actuators are fixed to the base, the upper ends of the guide posts being fixed to corresponding positions on the lower surface of the mounting plate.
7. An aircraft nose landing gear jack according to claim 1 or claim 6, wherein a universal wheel assembly is also secured to the base.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010412377.3A CN113665840B (en) | 2020-05-15 | 2020-05-15 | Jacking device for nose landing gear of airplane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010412377.3A CN113665840B (en) | 2020-05-15 | 2020-05-15 | Jacking device for nose landing gear of airplane |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113665840A true CN113665840A (en) | 2021-11-19 |
| CN113665840B CN113665840B (en) | 2023-04-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010412377.3A Active CN113665840B (en) | 2020-05-15 | 2020-05-15 | Jacking device for nose landing gear of airplane |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5242131A (en) * | 1992-04-08 | 1993-09-07 | The Boeing Company | Steerable landing gear |
| CN103963992A (en) * | 2013-01-29 | 2014-08-06 | 中国航空工业集团公司西安飞机设计研究所 | Method for mounting landing gear and cabin door of aircraft iron bird test platform |
| CN107264835A (en) * | 2017-07-13 | 2017-10-20 | 江西洪都航空工业集团有限责任公司 | A kind of gear test load charger |
| CN107600457A (en) * | 2017-08-23 | 2018-01-19 | 中航飞机起落架有限责任公司 | Device and its application method are removed in a kind of jacking that middle experiment is returned for aircraft nose landing gear soon |
| CN110884680A (en) * | 2019-11-13 | 2020-03-17 | 天津航天机电设备研究所 | Catapult-assisted take-off carrier-based aircraft nose gear turning life test device |
| CN111086649A (en) * | 2019-12-10 | 2020-05-01 | 燕山大学 | Experimental device for be used for testing warplane nose landing gear turning performance |
-
2020
- 2020-05-15 CN CN202010412377.3A patent/CN113665840B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5242131A (en) * | 1992-04-08 | 1993-09-07 | The Boeing Company | Steerable landing gear |
| CN103963992A (en) * | 2013-01-29 | 2014-08-06 | 中国航空工业集团公司西安飞机设计研究所 | Method for mounting landing gear and cabin door of aircraft iron bird test platform |
| CN107264835A (en) * | 2017-07-13 | 2017-10-20 | 江西洪都航空工业集团有限责任公司 | A kind of gear test load charger |
| CN107600457A (en) * | 2017-08-23 | 2018-01-19 | 中航飞机起落架有限责任公司 | Device and its application method are removed in a kind of jacking that middle experiment is returned for aircraft nose landing gear soon |
| CN110884680A (en) * | 2019-11-13 | 2020-03-17 | 天津航天机电设备研究所 | Catapult-assisted take-off carrier-based aircraft nose gear turning life test device |
| CN111086649A (en) * | 2019-12-10 | 2020-05-01 | 燕山大学 | Experimental device for be used for testing warplane nose landing gear turning performance |
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| Publication number | Publication date |
|---|---|
| CN113665840B (en) | 2023-04-14 |
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