RU229488U1 - NOSE COMPARTMENT OF THE FUSELAGE WITH BRACKETS FOR FASTENING THE OUTBOARD UNIT - Google Patents

Abstract

The utility model relates to the field of aircraft engineering and can be used in the layout of the nose section of a helicopter fuselage. The nose section of the fuselage with brackets for attaching a suspension unit (5) comprises a housing (3) closed at the top by an upper panel (4). The housing (3) comprises an opening (18) surrounded by walls (14). In the lower part of the housing (3), two brackets (7) are attached to two opposite walls (14) by means of walls (17), each of which is provided with a horizontal side (16). The wall (17) is connected to the side (16) by means of stiffening ribs (15), which have a triangular shape. The sides (16) are provided with openings (10) and lugs (11, 12), which are made with reinforcement. 6 Fig.

Description

The field of technology to which the utility model relates

The utility model relates to the field of aircraft construction and can find application in the layout of an aircraft, in particular, associated with the structural modification of the nose section of a helicopter fuselage to ensure external fastening of a suspension unit.

State of the art

A fuselage nose section is known (RU 2678729 C1, B64C 1/12, B64D 29/08, published 31.01.2019), which includes a fixed section and a movable section. The movable section consists of the first, second and third frames with the skin fixed to them. Two front guides 5 are bolted to the second frame 3 on the sides. Two rear guides 6 are bolted to the first frame 3 on the sides. The front guides 5 and the rear guides 6 have a rectangular shape and are made of polyamide with fiberglass. The fixed section 1 has first and second frames 8, to which the left and right rails 7 are fixed. The left and right rails 7 have the shape of a channel. Stops 9 are installed at the end of the left and right rails 7.

A camera mounting device is known (US 5710945 A, B64D 47/0, published 20.01.1998), in which the camera mounting mechanism is for supporting and isolating the external camera from vibration forces generated by the helicopter during flights. Separate shock absorbers are arranged in the form of a ring around the central axis of the mounting mechanism for absorbing vibration forces.

A known suspended container for an aircraft is the closest to the claimed technical solution (RU 2739018 C1, B64C 7/02, B64D 9/00, published on 21.12.2020), which contains a bracket with fastening units on which fairings with locks are installed. In this case, the bracket consists of a plate with a ring fixed in the center, and holders with fittings installed at the edges. In the lower part, the holders are connected to each other using a frame, which is additionally fixed to the ring on which pads with pins are installed. A retainer is provided on top of the plate, each fairing consists of a shell, on the cutout of which a stiffening pad is fixed. In this case, the shell is equipped with a belt with holes for pins in the ring on which locks and a gasket are installed.

The design elements presented in the analogues do not allow for the placement of the necessary equipment and the modernization of the helicopter by modifying the nose of the fuselage. The known technical solutions have a limited scope of application, since they are intended for the implementation of specific tasks.

Disclosure of the essence of the utility model

The technical problem solved by the claimed utility model is the creation of the nose section of the helicopter fuselage for the purpose of placing and rigidly securing the external suspension unit of the observation station, ensuring its operability and precise positioning relative to the carrier.

The technical result consists in increasing the accuracy of positioning and in ensuring rigid fastening of the suspension unit in the nose compartment of the helicopter fuselage.

In order to achieve the technical result, a nose section of the fuselage is proposed with brackets for attaching a suspension unit 5, comprising a housing 3, closed from above by an upper panel 4, wherein the housing 3 comprises an opening 18, surrounded by walls 14, wherein in the lower part of the housing 3 two brackets 7 are attached to two opposite walls 14 by means of walls 17, each of which is provided with a horizontal side 16, wherein the wall 17 is connected to the side 16 by means of stiffening ribs 15, which have a triangular shape, wherein the sides 16 are provided with openings 10 and lugs 11, 12, which are made with reinforcement.

In this way the technical result is achieved.

An increase in the positioning accuracy and a rigid fastening of the suspension unit 5 in the nose compartment 2 of the fuselage of the helicopter 1 is achieved by using the proposed nose compartment 2 on the helicopter 1, closed from above by the upper panel 4, in the body 3 of which there is an opening 18 surrounded by walls 14, wherein in the lower part of the body 3 two brackets 7 are fastened to two opposite walls 14, which contains a wall 17 with a side 16 connected by means of stiffening ribs 15, wherein the sides 16 are provided with openings 10 and lugs 11, 12, which are made with reinforcement; by fastening the suspension unit 5 by means of vertically arranged bolts 6 to the brackets 7, which in turn are fastened to the walls 14 of the opening 18 of the nose compartment 2 by means of horizontally arranged bolts 13.

Brief description of the drawings

The essence of the proposed utility model is explained by drawings:

Fig. 1 - General view of the helicopter, location of the nose compartment;

Fig. 2 - General view of the bow compartment;

Fig. 3 - Breakdown of the nose compartment into elements;

Fig. 4 - View of the installed brackets from above;

Fig. 5 - Brackets, general view %;

Fig. 6 - Brackets, top view.

Explanations to the drawings:

Implementation of a utility model

A nose section 2 of the fuselage is installed on the helicopter 1, which contains a body 3, closed from above by an upper panel 4 (Fig. 1, 2). The body 3 contains an opening 18, surrounded by walls 14, for the passage, placement and fastening of the suspension unit 5. In the lower part of the body 3, two brackets 7 are fastened to two opposite walls 14 using bolts 13, which are intended for fastening the suspension unit 5 (Fig. 2, 3).

Each bracket 7 has an angular cross-section and at the same time contains a vertical wall 17, which in the lower part is provided with a horizontal flange 16, and they are connected by means of three stiffening ribs 15, which have a beveled triangular shape. In this case, the flange 16 is made along the edges with two lugs 11, in which openings 8 are made for fastening 6 of the suspension unit 5. The walls 17 are provided along the edges with reinforcements 9, in which openings (not shown) are made for bolts 13 for fastening the brackets 7 to the walls 14 of the housing 3 (Fig. 4).

The sides 16 are made with shaped lugs 11 and 12, in which openings 8 are made for fasteners 6 for installing the suspension unit 5. The lugs 11 and 12 are made with reinforcement, i.e. local thickening of the material in order to increase the strength of the material for increasing the rigidity of the structure at the attachment points with the possibility of precise positioning in the bow compartment 2 (Fig. 5, 6). In the central part, the sides 16 are provided with lugs 12, in which class openings 10 are made for the pins of the suspension unit 5. The class of the opening is determined by a higher tolerance for deviation from the nominal size compared to the industry standard. In this case, two pins (not shown) are placed on the mating surface of the suspension unit 5.

Brackets 7 are manufactured as single parts from aluminum alloy by milling on a CNC machine, which allows achieving high quality surface treatment, reducing the thickness of the material, thereby reducing the weight of the structure without loss of strength and rigidity, while maintaining the accuracy of the configuration of the elements of the structure. The high quality of the treated surface eliminates the possibility of tilting the outboard unit 5 in pitch and roll when it is installed in the nose compartment 2, and, accordingly, the accuracy of positioning is increased and the rigidity of the attachment of the outboard unit 5 is ensured.

The body 3 of the nose section 2 is made of aluminum alloy. The fasteners of the bolted and screwed connections are made of high-alloy structural steel (not shown).

The assembly of the nose section 2 of the fuselage of the helicopter 1 is carried out as follows.

The hull 3 is fixed in the frame immovably. The upper panel 4 is fixed to the hull 3 using screws (not shown). Then, using a laser tracker or other devices, the location of the construction horizontal and the axis of symmetry of the bow section 2 is determined. Then, also using high-precision devices, the brackets 7 are set, i.e. their position is determined with an accuracy of seconds (in degrees) relative to the construction horizontal and the axis of symmetry of the bow section 2 in roll and pitch. At the same time, the specified position of the holes 10 is controlled, which set the position of the suspended block 5 along the course and ensure its precise positioning.

After determining the position, brackets 7 are connected with bolts 13 to walls 14 of hull 3 of bow section 2. Bolts 13 are installed horizontally in holes (not shown) of reinforcements 9. In this way, brackets 7 are securely fastened to walls 14 of hull 3 of bow section 2. After the operations are performed, suspension unit 5 is fastened to sides 16 of brackets 7 with bolts 6 installed vertically and secured with nuts (not shown) (Fig. 3). In this case, pins (not shown) of suspension unit 5 enter mating holes 10 on sides 16, guiding it along the course.

Thus, the increase in the positioning accuracy and the rigid fastening of the suspension unit 5 in the nose section 2 of the fuselage of the helicopter 1 is achieved by using the proposed nose section 2 assembled on the helicopter 1. At the same time, the flight and technical characteristics of the helicopter do not deteriorate.

Claims (1)

A nose section of a fuselage with brackets for attaching a suspension unit (5), comprising a housing (3) closed at the top by an upper panel (4), characterized in that the housing (3) comprises an opening (18) surrounded by walls (14), wherein in the lower part of the housing (3) two brackets (7) are attached to two opposite walls (14) by means of walls (17), each of which is provided with a horizontal side (16), wherein the wall (17) is connected to the side (16) by means of stiffening ribs (15), which have a triangular shape, wherein the sides (16) are provided with openings (10) and lugs (11, 12), which are made with reinforcement.

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