Device in a kind of new time
The utility model is related to a kind of mechanical structure, is specially device in a kind of new time.
Time middle device that the utility model is related to is mainly used in Aircraft landing gear system, and what is used aboard at present rises and falls
Frame is largely retractable tricycle landing gear, and when nose-gear is packed up, preceding wheel can make wheel due to ground controlling
Deviate neutral position, carrying out undercarriage control in this state can cause wheel to be collided with housing construction, such as landing gear compartment and hatch door
Deng, return in device make wheel take off it is liftoff after be in neutral position.
Nose-gear generally uses damper leg built-in cam return to neutral mechanism, and the mechanism is made up of upper and lower cam, is arranged on
Nose-gear damper leg (buffer) is internal, and overhead cam is fixed on the piston rod, and lower cam is arranged in damper leg outer barrel,
Overhead cam can be together with piston rod around damper leg rotation during Nose Wheel Steering.Take off it is liftoff after, inside buffer press
Under power effect, cam-engaged, makes front-wheel return to neutral position up and down.When aircraft floor is slided, the compression of buffer stand under load is upper and lower
Cam is disengaged, and nose-gear ground controlling is not influenceed.
In actual use, effect is normal in being returned when often occurring just beginning to use, Hui Zhonghuan after a period of time
Phenomenon slow or in can not returning.This is due to that upper and lower cam contact surface smoother uses one section when just beginning to use
After time, worn and torn up and down between cam, surface roughness increases, coefficient of friction increases between upper and lower cam, makes cam
Minimum pressure angle increases, and in causing cam difficult in returning or can not returning, operating pressure angle is close to or smaller than minimum pressure angle, such as schemes
Shown in 1.
It is particularly evident in light aerocraft cam failure mechanisms such case, due to light aerocraft nose-gear load compared with
It is small, by taking tricycle landing gear as an example, played that damper leg decrement is small before the ground taxi stage, upper and lower cam is in aircraft floor
It can not be disengaged (or can not be completely disengaged) during sliding race, during aircraft floor is turned, upper and lower cam is mutual due to buffer pressure
Extruding makes cam more easy to wear.This structure of the cam return to neutral mechanism inside damper leg, rises before not only causing light aerocraft
Damper leg is complicated, increase weight, also cause the mechanism check, maintenance difficult, go wrong can only change undercarriage or
Person's depot repair.
The content of the invention
Device during the utility model offer is a kind of new time, for solving to check after traditional return to neutral mechanism abrasion, repairing and be stranded
Difficult the problem of.
The technical scheme that the utility model is taken is：Device in a kind of new time, including start cartridge module and cam 1, its
Middle start cartridge module includes outer barrel 3, inflation valve 4, piston rod 5, end cap 6, pulley support 7, pulley 8；Start cartridge module China and foreign countries
3 tops of cylinder are equipped with inflation valve 4, and bottom is equipped with end cap 6, and piston rod 5 is arranged on inside outer barrel 3, and the lower end of piston rod 5 has installation to slide
The pulley support 7 of wheel 8, start cartridge module is connected by mounting bracket 22 with nose-gear damper leg 21, and cam 1 passes through cam
Erection support 23 is connected with anti-torque arm 24, and anti-torque arm 24 is connected with installing the wheel fork rotatable parts of wheel, and cam 1 has V-type bent
Face, pulley 8 is rolled on the V-type curved surface of cam 1.
Further, above-mentioned start cartridge module also include gag lever post 2, be installed between pulley 8 and outer barrel 3, make pulley 8 with
Deflection is not produced when being rolled on cam 1, prevents it from skidding off cam because of deflection.
Beneficial effect：Device is using independent external pressurized strut and cam in this time, and the installation weight is light, small volume, helps
The damper leg structure in before simplification, reduces weight for light aerocraft, reduces cost and have positive role, while solving tradition
After return to neutral mechanism abrasion the problem of inspection, maintenance difficult.
Brief description of the drawings
Fig. 1 is schematic device in conventional buffer pillar built-in convex samsara；
Fig. 2 is apparatus structure schematic diagram during the utility model is returned；
Fig. 3 is device scheme of installation during the utility model is returned；
Fig. 4 is device compressive state schematic diagram during the utility model is returned；
Wherein, 1：Cam, 2：Gag lever post, 3：Outer barrel, 4：Inflation valve, 5：Piston rod, 6：End cap, 7：Pulley support, 8：
Pulley, 21：Nose-gear damper leg, 22：Mounting bracket, 23：Cam erection support, 24：Anti- torque arm.
The embodiment of the present invention is further illustrated with reference to Figure of description.
Device in a kind of new time, is mainly made up of start cartridge module with cam 1, and wherein start cartridge module includes gag lever post
2nd, outer barrel 3, inflation valve 4, piston rod 5, end cap 6, pulley support 7, pulley 8, as shown in Figure 2.
In new time during device use, start cartridge module falls frame damper leg by mounting bracket 22 and nose-gear
21 connections, cam 1 is connected by cam erection support 23 with anti-torque arm 24, and anti-torque arm 24 is connected with damper leg piston rod, such as
Shown in Fig. 3.After installation, gases at high pressure are filled with by the inflation valve 4 on start cartridge module, gases at high pressure are enclosed in outer barrel
The upper end of 3 inner piston rod 5, the pressure promotes piston rod 5 to be moved downward along outer barrel 3, pulley 8 is kept the V-type song for having to cam 1
The movement tendency that face bottom is rolled.When nose-gear deviates neutral position, wheel is rotated by anti-torque arm 24 with moving cam 1,
V-type curved surface of the pulley 8 along cam 1 promotes the further compression internal high pressure gas of outer barrel 3 of piston rod 5 to rolling at the top of V-type curved surface
Body.When the external force for deflecting wheel disappears, gases at high pressure promote piston rod 5 pulley 8 is rolled to the V-type curved bottom portion of cam 1
Dynamic, wheel returns to neutral position, as shown in Figure 2, Figure 4 shows.
The device can be filled with the time in start cartridge module in the samsara of gas pressure control machine, use environment spirit by adjustment
Living, while cam easy to wear is external, device is easy to maintenance and inspection in also making this time, solves the maintenance of conventional cam return to neutral mechanism
Difficult the problem of.
The start cartridge module of device is driven by the way of seals high pressure gas in this new time, it would however also be possible to employ mechanical elastic
The similar means such as spring are substituted, and the pulley position and cam of start cartridge module one end can be exchanged, i.e., start cartridge module lower end is installed
Cam, is used cooperatively with separately installed roller so that device is widely applicable in this new time.
The utility model can be not only used for light aerocraft nose-gear, can be used for needing remaining neutral during exercise
In the mechanical structure of position.