Lock the retracted chassis

IPC classes for russian patent Lock the retracted chassis (RU 2076827):

B64C25/10 - retractable, foldable, or the like

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(57) Abstract:

The invention relates to mechanical engineering and can be used for securing cargo or structures up to a height of States, in particular in an aircraft, for fixing the landing gear of aircraft in the retracted position. Lock the retracted chassis includes a housing consisting of two interconnected cheeks 1, the hook 2, the power cylinder 3, the elastic element 4. The castle is equipped with a two-tier mechanism, the upper link 5 which is made in the form of two shoulders of the lever pivotally connected to one arm, with the end of the elastic element 4, and the other with the hook 2. 1 C.p. f-crystals, 2 Il.

The invention relates to mechanical engineering and can be used for securing cargo or structures up to a height of the state, in particular in an aircraft, for fixing the landing gear of aircraft in the retracted position.

The famous castle suspension nose gear of the aircraft Tu-154, comprising a housing consisting of two cheeks, a hook with a roller pivotally mounted between the cheeks, a power cylinder, a spring and a latch pivoted between the jaws and pivotally connected with the rod of the hydraulic cylinder, the mechanism end off the-42-3154, M. 1978). The castle is rather bulky and heavy (2,40 kg). It has a latch to lock the hook in the closed position, which is made of shaped groove, into which put a roller mounted on the lever hook. Despite the fact that rolling friction is much less sliding friction (compared to other locks with latch) still have the possibility of jamming of the hook when opening or closing as a result of deformation structures in the harvesting and production of chassis. Additionally, the presence of the latches locks of similar design, which itself should be fixed by the action of the spring in position is an element of unreliability.

Also known castle of the retracted landing gear Yak-42, comprising a housing consisting of two cheeks, a hook pivotally mounted between the jaws, a latch pivoted on the housing and pivotally connected to the hook by means of a spring cylinder, hydraulic cylinder, spring and lever for manual opening mechanism limit switches. (See The operation manual of the Yak-42, section 32.10.06, Fig.1, pages 1-2, 1982. publication of the Saratov aviation plant).

Castle bulky, has a large mass (3,03 kg). The presence of design is sirvydas in the closed position of the hook spring cylinder reduces the reliability of the castle, because it is possible jamming of the sliding surfaces or the hook is released upon failure of the spring cylinder.

Technical result achieved in the implementation of the invention is to improve reliability and reduce the weight of the structure of the castle.

This technical result is achieved by the fact that the castle retracted position of the chassis, comprising a housing consisting of two connected between the cheeks, a hook pivotally mounted between the cheeks, power cylinder, the elastic element is equipped with a two-tier mechanism, the upper part of which is made in the form of two shoulders of the lever, hinged to the casing and pivotally connected to one arm, with the end of the elastic element, the other end of which is pivotally attached to the housing with the other arm, with the lower link of a two-tier mechanism, which other end pivotally connected to the hook, the lower link of the two-tier mechanism in the closed position cruch is with the adjacent shoulder of the upper link of the kinematic castle, in addition, on one shoulder top managers set the roller in contact with the piston rod of the power cylinder, and on the other shoulder done restrictive emphasis.

The hinges on the lower level of the TLD is the s chassis; in Fig.2 is a kinematic diagram of the lock retracted position of the chassis.

Castle retracted position of the chassis is a hydro-mechanical device. Its design is shown in Fig.1 in the closed position of the hook.

The lock includes a housing consisting of two interconnected cheeks 1 (front cheek removed, the hook 2, pivotally mounted between the cheeks, the power cylinder 3, the elastic element 4, hinged at one end on the housing and consisting of a spring rod and a pivoting bearing, two-tier mechanism, the upper link 5 which is a two shoulders lever pivoted on the housing between the jaws and pivotally connected to one arm with the other end of the elastic element 4, the other arm, with the lower link mechanism 6, which is the other end pivotally connected to the hook 2. The lower link 6, in the closed position, the hook has with the adjacent shoulder of the upper link 5 of the deflection "C" (Fig.2), forming a kinematic castle. Cheeks 1 lock body are parallel and are connected by bolts, which at the same time still attach the power cylinder 3, and a bolt pivotally securing the hook 2. Cheeks 1 the body is a smart mouth "And" to sign pendant earrings Patsy each other by means of bolts passing through holes in these lugs when installing the lock on the frame. The hook 2 to ensure closure has a lever "B". On the shoulder of the upper link 5, connected to the lower link mechanism 6 is installed roller 7 in contact with the piston rod of the power cylinder 3, and on the other shoulder done restrictive emphasis "In" contact with the open position of the hook, with the reference area "G" housing of the power cylinder. On the axis of the lever 5 has a shank "D" with a groove for the drive mechanism of the limit switches. The case of the power cylinder 3 has fittings "E" and "F" for the main system cleaning-release chassis and fitting "And" emergency release system.

Lock the retracted chassis operates as follows.

Starting position:
the landing gear down;
the castle is open, the lever "B" of the hook 2 is located in the opening of the throat "And" cheeks 1 lock case (Fig.1 the position of the hook is shown by a thin line);
the piston rod of the power cylinder is released and rests on the roller 7 of the upper link 5;
the emphasis In the" upper link 5 is in contact with the base platform of the "G" housing of the power cylinder 3;
fittings "E", "W" and "And" the case of the power cylinder is communicated with the drain line cleaning systems and landing gear.

Lock under the action of mechanical pendant earrings landing gear. When submitting davanloo cylinder 3 castle is draining the working fluid. Ubinas, chassis support its hanging earring is included in the guide Zev "And" cheeks 1 lock, push the lever "B" of the hook 2 and rotates the hook, which, through the link 6 two-tier mechanism rotates the upper part (lever) 5. Spring elastic element 4 is compressed, the emphasis In the" upper link 5 moves away from the supporting point "G" housing of the power cylinder 3. Elastic element with shoulder top level are "dead position" (when the longitudinal axis of the lever arm and the elastic element are on the same line). Further, under the action of earrings landing gear and springs of the elastic element 4 upper part 5 continues to unfold 3 (and the time from the spring force increases instantly). Another lever arm 5 operates its roller 7 on the piston rod of the power cylinder during rotation and utaplivaet it into the housing of the power cylinder. By this time hanging earring landing gear fully engages and rests in mouth "And" cheeks 1, and the other lever arm 5 and the lower link mechanism 6 are "dead position", i.e. their longitudinal axis be on one line. Spring elastic element 4 puts them in this position, bring the rod of the power cylinder 4 until it stops inside the case. The hook 2 and, consequently, the lock is closed. Thus the longitudinal tx2">

Thus, the hook 2 is fixed in the closed position kinematically. It really is so because under the weight of the chassis earring support, acting on the hook 2 down, creates a moment, unwrapping it with respect to its hinge mounting clockwise. In the link 6 two-tier mechanism creates a compressive force due to the deflection of attempts to deploy the upper part (two shoulders lever) 5 counterclockwise. But the lever 5 abuts against the roller 7 in the piston rod of the power cylinder 3, which is recessed into the chassis until it stops. Under the influence of the weight of the landing gear is like "Samosata" hook lock.

The opening of the lock occurs when the supply pressure of the working fluid into the socket "W" body of the power cylinder 3. The cylinder rod is retracted presses the roller 7 and rotates the upper link 5. The elastic element 4 is compressed, its longitudinal axis with the longitudinal axis of the shoulder of the upper link are "dead" position (when they lie on the same line), the emphasis In" the top link is the anchor space "G" housing of the power cylinder 3. The lower link 6 and the adjacent shoulder of the upper link 5 go through the "dead" position and release the hook 2 will cast the Assi. The castle is open. After the piston rod of the power cylinder has been fully opened access to the working fluid pressure of the main hydraulic system to the fitting "E" housing of the power cylinder 3 (by design of the cylinder) and then by pipeline to the cylinder cleaning-release chassis pressure alarm system is served in the socket And the power cylinder 3 and the hydraulic cylinder cleaning-release chassis. Castle opens in the same way.

1. Lock the retracted chassis, comprising a housing consisting of two interconnected cheeks, a hook pivotally mounted between the cheeks, a power cylinder, an elastic element, characterized in that it is equipped dusmanim mechanism, the upper part of which is made in the form of two shoulders of the lever, hinged to the casing and pivotally connected to one arm, with the end of the elastic element, the other end of which is pivotally attached to the housing and the other arm lower link dvuhzvennuju mechanism, which other end pivotally connected to the hook, the lower link dvuhzvennuju mechanism in the closed position, the hook is adjacent the shoulder of the upper link of the kinematic castle, in addition, on one shoulder top link is the first stop.

2. Castle under item 1, characterized in that the hinges on the lower level of dvuhzvennuju mechanism is made spherical.