Undercarriage cabin door opening position locking device linked with undercarriage

Abstract

The invention discloses an undercarriage cabin door opening position locking device linked with an undercarriage, which is characterized in that a bevel gear I is fixed at the left end of a rotating shaft of the undercarriage, a bevel gear II meshed with the bevel gear I is fixed at one end of a sleeve, a cylindrical gear I is fixed at the other end of the sleeve, and a shaft of the cylindrical gear I is rotatably fixed on a support frame; the support frame is fixed on a left side wall plate of the undercarriage cabin; a shaft of a cylindrical gear II meshed with the cylindrical gear I is rotatably fixed on the support frame and is parallel to a shaft of the cylindrical gear I; a rack bolt meshed with the cylindrical gear II is opposite to a locking hole formed in a larger lug of the cabin door rotating shaft I; when the undercarriage cabin door is opened in place, the rack bolt is inserted into the locking hole, and when the rack bolt retreats from the locking hole, the undercarriage cabin door is closed. The undercarriage cabin door locking device can be locked after an undercarriage cabin door is opened, and is simple in structure, high in fixing reliability, easy to manufacture and low in cost.

Description

Technical Field

[0001] The invention belongs to the technical field of aircraft locking device manufacturing, and relates to an open position locking device for a landing gear door linked with a landing gear. Background Art

[0002] The landing gear is a load-bearing device for the aircraft to take off, land, taxi and park. It can consume and absorb the impact energy of the aircraft during taxiing and landing. It is the most important load-bearing functional component of the aircraft. The main function of the landing gear door is to open when the landing gear is lowered to ensure the smooth lowering of the landing gear. When the landing gear is retracted, the door is closed to maintain the good aerodynamic shape of the aircraft. According to the opening form of the landing gear door, it is divided into linkage and single opening. The linkage means that as the landing gear is retracted and lowered, the connecting rod fixed on the landing gear drives the landing gear door to close and open together. The single opening means that the landing gear and the landing gear door are driven by different mechanisms respectively and do not affect each other. The landing gear door requires a locking device in both the open and closed positions to prevent the door from making unexpected movements and affecting the retraction and extension of the landing gear or the aerodynamic shape of the aircraft. The existing linkage mechanism fixes the landing gear in the lowered position through the landing gear lower lock, and drives the connecting rod mechanism connected to the landing gear to fix the landing gear door. This form of movement involves multi-rod movement in space, and the connection positions of various components are difficult to determine. The structure is complex, difficult to manufacture, costly, and has poor fixing reliability. The single-opening mechanism requires continuous pressure supply to the door actuator or a locking mechanism to be provided in the door actuator. When the aircraft is parked, all power, air and hydraulic sources will be cut off, and the door actuator will not be continuously supplied with pressure. The form of providing a locking mechanism in the door actuator is relatively complicated. Summary of the invention

[0003] The purpose of the present invention is to solve the above-mentioned problems existing in the prior art and to provide a landing gear door open position locking device linked with the landing gear, which can be locked after the landing gear door is opened, has a simple structure, high fixing reliability, is easy to manufacture and has low cost.

[0004] To achieve the above-mentioned purpose, the technical solution of the present invention is: a landing gear door open position locking device linked with the landing gear, comprising a bevel gear I, a bevel gear II, a sleeve, a cylindrical gear I, a cylindrical gear II and a rack latch; the bevel gear I is fixed to the left end of the landing gear shaft, the bevel gear II meshing with the bevel gear I is fixed to one end of the sleeve, the other end of the sleeve is fixed with the cylindrical gear I, the shaft of the cylindrical gear I is rotatably fixed on the support frame, and the support frame is fixed to the left side wall plate of the landing gear compartment; the shaft of the cylindrical gear II meshing with the cylindrical gear I is rotatably fixed on the support frame and is parallel to the shaft of the cylindrical gear I; the rack latch meshing with the cylindrical gear II is directly opposite to the locking hole opened on the larger lug of the door rotation axis I; when the landing gear door is fully opened, the rack latch is inserted into the locking hole, and when the rack latch exits the locking hole, the landing gear door is closed.

[0005] Further preferably, the specific fixing structure of the bevel gear I fixed to the left half-shaft end of the landing gear shaft is: a cavity is provided at the left half-shaft end, the shaft of the bevel gear I is inserted into the cavity at the left half-shaft end and is fixed to the left half-shaft end by two bolts that are perpendicular to each other and whose axes are not in the same radial plane of the left half-shaft.

[0006] Further preferably, the shaft of the bevel gear II passes through one end of the sleeve and is fixed to one end of the sleeve by two bolts that are perpendicular to each other and whose axes are not in the same radial plane of the sleeve; one end of the shaft of the cylindrical gear I passes through the other end of the sleeve and is fixed to the other end of the sleeve by two bolts that are perpendicular to each other and whose axes are not in the same radial plane of the sleeve; the other end of the shaft of the cylindrical gear I is rotatably fixed to the support frame.

[0007] Before the landing gear is lowered, the landing gear door actuator cylinder supplies pressure to push the door rotation shaft I to rotate, driving the door fixed to the door rotation shaft I to rotate. When the door rotates to the open position (i.e. rotates 90°), the landing gear actuator cylinder supplies pressure, and the landing gear actuator cylinder pushes the landing gear, the landing gear rotation shaft and the bevel gear I to rotate together. The bevel gear I drives the bevel gear II to rotate, thereby driving the cylindrical gear I to rotate. The cylindrical gear II rotates, thereby driving the rack latch matched with the cylindrical gear II to move downward. When the landing gear is lowered into place, the rack latch is inserted into the locking hole opened on the larger lug of the door rotation shaft I to complete the locking of the door.

[0008] Compared with the prior art, the present invention has the following beneficial effects: the present invention can lock the landing gear door after it is opened, has a simple structure, high fixing reliability, is easy to manufacture, and has a low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic diagram of the three-dimensional structure of the rack latch of the present invention when it exits the locking hole; Figure 2 It is a schematic diagram of the three-dimensional structure of the rack latch of the present invention when it is inserted into the locking hole. DETAILED DESCRIPTION

[0010] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0011] like Figure 1 and Figure 2As shown, this embodiment includes bevel gear I11, bevel gear II10, sleeve 15, cylindrical gear I9, cylindrical gear II8 and rack latch 6. The front end of the landing gear 17 is fixed to the landing gear shaft by screws. The landing gear shaft is composed of left and right half shafts 12 and 14. The left and right half shafts 12 and 14 are respectively rotatably fixed on the base 19 on the front wall plate 13 of the landing gear compartment. The bevel gear I11 is fixed to the end of the left half shaft 12 of the landing gear shaft. Its preferred specific fixing structure is: a cavity is provided at the end of the left half shaft 12, and the shaft of the bevel gear I11 is inserted into the cavity at the end of the left half shaft 12 and fixed to the end of the left half shaft 12 by two bolts that are perpendicular to each other and whose axes are not in the same radial plane of the end of the left half shaft 12. The bevel gear II10 meshing with the bevel gear I11 is fixed to one end of the sleeve 15, and the other end of the sleeve 15 is fixed with a cylindrical gear I9, and the shaft of the cylindrical gear I9 is ​​rotatably fixed to the support frame 5. Preferably, the shaft of the bevel gear II10 passes through one end of the sleeve 15 and is fixed to one end of the sleeve 15 by two bolts that are perpendicular to each other and whose axes are not in the same radial plane of the sleeve 15; one end of the shaft of the cylindrical gear I9 passes through the other end of the sleeve 15 and is fixed to the other end of the sleeve 15 by two bolts that are perpendicular to each other and whose axes are not in the same radial plane of the sleeve 15; the other end of the shaft of the cylindrical gear I9 is ​​rotatably fixed to the support frame 5. The support frame 5 is fixed to the left side wall plate 1 of the landing gear compartment. The shaft 7 of the cylindrical gear II8 meshing with the cylindrical gear I9 is ​​rotatably fixed to the support frame 5 and is parallel to the shaft of the cylindrical gear I9. The nut 4 screwed on the shaft of the cylindrical gear I9 and the shaft of the cylindrical gear II8 rotatably positions the two shafts on the support frame 5. The rack latch 6 meshing with the cylindrical gear II8 faces the locking hole on the larger lug of the door rotation axis I2; when the landing gear door 18 is fully opened, the rack latch 6 is inserted into the locking hole, and the rack latch 6 is withdrawn from the locking hole, and the landing gear door 18 is closed. 1 is the left side wall of the landing gear compartment, 3 is the door actuator cylinder connection part, and 16 is the connection part with the landing gear actuator cylinder.

[0012] Of course, the present invention has many other embodiments. Without violating the spirit and essence of the present invention, technicians familiar with the field can make corresponding changes and deformations based on the present invention, but these corresponding changes and deformations should be regarded as improvements of equivalent technologies and belong to the protection scope of the claims of the present invention.

Claims

1. A landing gear door open position locking device linked with a landing gear, characterized in that: It comprises a bevel gear I, a bevel gear II, a sleeve, a cylindrical gear I, a cylindrical gear II and a rack latch; the bevel gear I is fixed to the left end of the landing gear shaft, the bevel gear II meshing with the bevel gear I is fixed to one end of the sleeve, the other end of the sleeve is fixed with the cylindrical gear I, the shaft of the cylindrical gear I is rotatably fixed on the support frame, and the support frame is fixed to the left side wall plate of the landing gear compartment; the shaft of the cylindrical gear II meshing with the cylindrical gear I is rotatably fixed on the support frame and is parallel to the shaft of the cylindrical gear I; the rack latch meshing with the cylindrical gear II is directly opposite to the locking hole opened on the larger lug of the door rotation axis I; when the landing gear door is fully opened, the rack latch is inserted into the locking hole, and when the rack latch is withdrawn from the locking hole, the landing gear door is closed.

2. The landing gear door open position locking device linked with the landing gear according to claim 1, characterized in that: The specific fixing structure of the bevel gear I fixed to the left half-shaft end of the landing gear shaft is: a cavity is provided at the left half-shaft end, the shaft of the bevel gear I is inserted into the cavity at the left half-shaft end and is fixed to the left half-shaft end by two bolts that are perpendicular to each other and whose axes are not in the same radial plane of the left half-shaft.

3. The landing gear door open position locking device linked with the landing gear according to claim 1 or 2, characterized in that: The shaft of the bevel gear II passes through one end of the sleeve and is fixed to one end of the sleeve by two bolts that are perpendicular to each other and whose axes are not in the same radial plane of the sleeve; one end of the shaft of the cylindrical gear I passes through the other end of the sleeve and is fixed to the other end of the sleeve by two bolts that are perpendicular to each other and whose axes are not in the same radial plane of the sleeve; the other end of the shaft of the cylindrical gear I is rotatably fixed to the support frame.

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