Device to connect casing and accessory gear box of gas-turbine engine

FIELD: mechanical engineering; gas-turbine engines.

SUBSTANCE: invention relates to units of drives of gas-turbine engines of aircraft and ground application. Proposed device contains fastening members and movable member telescopically connected with casing. Movable member is on accessory gear box and secured by pressure flange for displacement along end face of box. Clearance is formed between mating surfaces of flange and movable member.

EFFECT: improved reliability of connection of casing and accessory gear box by providing their rigid connection and sealing of inner spaces.

3 dwg

 

The invention relates to drive units of aircraft gas turbine engines, gas turbines applications and can be used in mechanical engineering for the connection of modules, such as an internal combustion engine and the transmission.

A known design of gas turbine engine with the bolt or stud connection of the power chassis (frame) with box drive units, flanged connector. At the same time to ensure the tightness of the connector is used paronit gasket coated with sealant (Technical description D-30 series II, M.: Mashinostroenie, 1973, p.32-43).

A disadvantage of the known construction is low manufacturability of the device, since the connector must include in addition to the construction set of nuts and bolts, screwed tightly fitted in the housing or in a box, or a set of bolts and nuts for connecting boxes and enclosures, as well as details for centering.

Closest to the claimed design is a device for mounting boxes actuators with adjustable rigidity (US No. 6260351 B1).

A disadvantage of the known designs adopted for the prototype, is the large number of parts connection of the casing and the box included in the design, low rigidity in the place of the connector housing and the box, and fastening elements, not the security is guaranteed that the tight connection of the inner cavities, the low accuracy of the mutual centering that determines the vulnerability of a kinematic chain at the site of the actuator box.

The technical problem on which the invention is directed, is to increase the reliability of the connection of the power chassis and drive box assemblies by providing a rigid connection and integrity of internal cavities due to the rolling element, free from the effects of radial and axial loads arising in the connection.

The essence of the technical solution consists in that the connection device of the power chassis and drive box assemblies of gas turbine engine containing the fasteners according to the invention, on the box of the drive units installed and fixed clamping flange, with the possibility of bias on the side of the box telescopically coupled to the housing of the movable member, between the mating surfaces of the flange and the rolling element is made of the gap.

Installation on the box drive units of the rolling element telescopically connected to the housing, enables the displacement on the surface of the edge of the box perpendicular to the axis of the telescoping surfaces of the connection within, compensating permissible deviation of alignment, and the presence of other valid errors manufactured by the Department of housing parts and boxes. The presence of the rolling element in the construction of hermetically connects the internal cavity of the box and the housing, eliminating the impact loads that occur due to manufacturing errors of parts, reduces the impact of vibration from the rotating parts and components of engine parts connecting the internal cavity.

The gap between the mating surfaces of the flange and the rolling element prevents deformation of parts in connection with the mounting of the box on the case, which is possible due to the influence of the allowable error in the manufacturing process details.

Figure 1 shows the fastening of the box drive units on the power casing of the gas turbine engine.

Figure 2 - element I in figure 1 (a movable element in a larger view).

Figure 3 - section a-a in figure 1.

Device connection power chassis and drive box assemblies of gas turbine engine 1 comprises a power housing 2, box drive units 3, rolling elements 4, the fastening elements 5 of the casing, fastening elements 6 boxes, sealing rings 7 and 8, the clamping flange 9 and bolts 10 of the flange 9 on the box 3. 5 elements include centering sleeve 11 and the thrust washers 12. Elements 6 include centering sleeve 13. Mounting the box to the chassis is centering bolts 14, a washer 15 and nut and 16. The movable element 4 with the sealing ring 7 in an annular groove is placed on the end of the box 3, and under him in the ring groove of the box is placed a sealing ring 8. The movable element 4 is placed a clamping flange 9, which is attached to the box 3 by means of bolts 10. The existing gap between the surface 17 of the clamping flange 9 and the surface 18 of the rolling element 4 allows the latter to move along the surface 19 of the end box 3 within the gap between the surface 20 of the clamping flange 9 and the surface 21 of the element 4 without disturbing the integrity of connected cavities of the body and the box. The moving element 4 within the specified gap prevents deformation of parts in connection with the mounting of the box on the case, which is possible due to the influence of the allowable error in the manufacturing process details.

The device operates as follows. When mounting the box 3 on the housing 2 of the telescopic part of the rolling element 4 with o-ring 7 comprises a chamfer 22 in a landing surface 23 of the housing 2 and tightly closes the inner cavity 24 of the housing 2 and the inner cavity 25 box 3. The fastening elements 5 of the housing 2 and the fastening elements 6 boxes 3 through the centering sleeve 11 and 13, the shim 12, chosen on the necessary size to ensure centering of the box relative to the building is along the axis of the engine, insert the centering bolts 14. The bolts are fastened by nuts 16 and washers 15. When setting the centering pins 14 in the fastening elements 5 and 6 is the centering of the box relative to the housing in a horizontal plane, with the element 4, shifting relative to the box on the magnitude of the errors in the manufacture of the housing parts and boxes, occupies a position in which the connection is not experiencing strain from those errors. A tight seal is ensured by the tight contact of the ring 7 with the surface 23, the surfaces of the groove element 4, a tight contact ring 8 with the surface 26 of the rolling element and the surfaces of the grooves on the box 3. Items 5 and 6 carry the power load from the impact of the weight of the carton and drive units, as well as the impact from vibration of rotating parts and components of the engine. When the movable element 4, which provides a tight seal that does not carry power loads and seals the internal cavity of the connection.

Device connection power chassis and drive box assemblies of gas turbine engine containing fastening elements, characterized in that on the box drive units installed and fixed clamping flange, with the possibility of bias on the side of the box telescopically coupled to the housing of the machining is iny element, between mating surfaces of the flange and the rolling element is made of the gap.



 

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