Intermediate case mounting seat of aero-engine

Abstract

The utility model discloses a mounting seat for an intermediate case of an aero-engine, which comprises a seat body, a knuckle bearing, a plurality of bolts and a hoisting part. And the top head on the butt joint enters the knuckle bearing. Through the universal rotation characteristic of the knuckle bearing, the assembly tolerance possibly brought during installation is eliminated, and the stress condition of the middle hole of the installation base is optimized. Compared with the prior art, the engine has the advantages that the engine is large in size and has a certain installation angle in the wing state, and the central axis of the engine is not perpendicular to the ground. Compared with a traditional installation mode that the ejector head is directly inserted into the round hole, the knuckle bearing is embedded in the round hole, the difficulty in assembling the ejector head and the installation base is reduced, and the error-tolerant rate of assembly tolerance is increased. And meanwhile, the conditions of insufficient contact between the ejector head and the round hole and stress concentration in the prior art are also avoided. After the ejector head is matched with the knuckle bearing, stress can be evenly dispersed to the inner wall of the round hole.

Description

Technical Field

[0001] This utility model relates to the installation of an aircraft engine intermediate casing and tooling, and particularly to an aircraft engine intermediate casing mounting base. Background Technology

[0002] For airlines, routine inspection, maintenance, service, and replacement of aircraft engines are unavoidable and crucial tasks. Several important types of tooling include engine transport and storage racks, engine replacement guide hoists, integrated core engine hoists, and support bases, all requiring fixed support and lifting points for installation. Therefore, engines typically have pre-installed support and lifting points. However, in recent years, to reduce the weight of aircraft engines, their structural layouts have become increasingly compact. The original integrated support and lifting points, formed integrally with the intermediate casing, have been eliminated, and the mounting base is now defined as a dedicated tooling. This mounting base is required to be fixed to four pre-drilled bolt holes in the engine's intermediate casing, one on each side. It must also meet the strength requirements for lifting, road transport, and air transport of the aircraft engine, and be compatible with various hoisting tools and racking equipment. For engine transport and storage racks, a butt joint is generally used to connect the mounting base; more specifically, the top end of the butt joint is inserted into the round hole of the mounting base. Engines are relatively large and have a certain installation angle in wing configuration, meaning the engine's central axis is not perpendicular to the ground. This traditional installation method, in which the mandrel is directly inserted into the round hole, results in insufficient contact between the mandrel and the round hole, leading to stress concentration. Utility Model Content

[0003] This application provides an intermediate casing mounting base for an aircraft engine, which can solve the problems mentioned in the background art.

[0004] This application provides an intermediate casing mounting base for an aircraft engine, comprising:

[0005] The base has a first curved side surface for fitting the intermediate housing; the first side surface also has a groove for avoiding interference with the surface of the intermediate housing; the second side surface opposite to the first side surface is a flat surface; the second side surface also has a circular hole in the middle along its normal direction; the base also has multiple mounting through holes around the circular hole.

[0006] Multiple bolts are sequentially inserted into multiple mounting through holes in the base body;

[0007] A spherical bearing is installed in the circular hole of the base body;

[0008] The hoisting part is provided with a hoisting hole and is fixedly connected to the top of the base.

[0009] In some embodiments, the base is a single piece, the spherical bearing is a single inner ring; the circular hole is a through hole, the first end of the circular hole is used to block the spherical bearing, and the second end is provided with two opposing limiting protrusions in the first direction; when the annular planes at both ends of the spherical bearing are also opposite in the first direction, it can be installed / removed from the base.

[0010] In some implementations, two limiting protrusions are located at the end of the circular hole near the first side.

[0011] In some embodiments, the top of the base is provided with a threaded hole for the hoisting part to be threadedly connected and fixed, and the axis of the threaded hole is perpendicular to the axis of the circular hole.

[0012] In some embodiments, an annular shock-absorbing pad is also included, which is fixedly connected to the second side of the seat and corresponds to the circular hole.

[0013] In some embodiments, the mounting through hole is a stepped hole, including: a first hole for a bolt to pass through and a second hole for a protrusion on the intermediate housing to enter.

[0014] In summary, this application discloses an intermediate casing mounting base for an aircraft engine, comprising a base body, a spherical bearing, multiple bolts, and a lifting component. The mandrel on the connector is inserted into the spherical bearing. Utilizing the omnidirectional rotation characteristic of the spherical bearing, assembly tolerances that may arise during installation are eliminated, optimizing the stress distribution in the intermediate hole of the mounting base. The beneficial effects are as follows: Due to the large size of the engine and its installation angle in wing configuration, the engine's central axis is not perpendicular to the ground. Compared to the traditional installation method where the mandrel is directly inserted into the circular hole, embedding the spherical bearing within the circular hole reduces the difficulty of assembling the mandrel and the mounting base, increasing the tolerance for assembly tolerances. Simultaneously, it avoids the situation of insufficient contact between the mandrel and the circular hole, leading to stress concentration. After the mandrel and the spherical bearing mate, the stress is evenly distributed to the inner wall of the circular hole. Attached Figure Description

[0015] To better illustrate the technical solutions in the embodiments of this application or the background art, the accompanying drawings used in the embodiments of this application or the background art will be described below.

[0016] Figure 1 This is a schematic diagram of the present application;

[0017] Figure 2 A schematic diagram showing the seat body tilted towards the second side;

[0018] Figure 3 A schematic diagram showing the seat body tilted towards the first side;

[0019] Figure 4 This is a front view of this application;

[0020] Figure 5 for Figure 4 A cross-sectional view along AA.

[0021] In the picture,

[0022] 1. Base; 1a. First side surface; 1b. Groove; 1b1. Hole; 1c. Second side surface; 1d. Round hole; 1d1. Limiting protrusion; 1f. Mounting through hole; 1f1. First hole; 1f2. Second hole; 1g. Threaded hole;

[0023] 2. Spherical plain bearing;

[0024] 3. Bolts;

[0025] 4. Lifting section; 4a. Lifting hole;

[0026] 5. Shock-absorbing pads. Detailed Implementation

[0027] The following description is provided in conjunction with the accompanying drawings, which are for illustrative purposes only and not strictly to scale. Unless otherwise defined, the technical or scientific terms used in this disclosure should be understood in their ordinary sense by one of ordinary skill in the art to which this disclosure pertains. The terms "first," "second," and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described object changes. Unless otherwise specified, the embodiments in this application can be combined with each other.

[0028] Please see Figure 1 and Figure 4 An aircraft engine intermediate casing mounting base includes a base body 1, a spherical bearing 2, multiple bolts 3, and a lifting part 4.

[0029] Please see Figure 1 , Figure 3 and Figure 5 The first side 1a of the base 1 is an arc surface, that is, the first side 1a is used to fit with the intermediate housing. Because the intermediate housing has protrusions, bolts, etc. at the position for mounting the base, which will interfere with the fit between the first side 1a and the intermediate housing, the first side 1a is also provided with grooves 1b. These grooves 1b are used to avoid interference from the surface of the intermediate housing.

[0030] Please see Figure 1 and Figure 2 The second side 1c of the base 1 is opposite to the first side 1a and is a plane. A circular hole 1d is provided in the middle of the second side 1c, and the axis of the circular hole 1d can coincide with the normal direction of the second side 1c. More specifically, when the connector of the transport storage bracket is connected to the mounting base, the top head on the connector enters the circular hole 1d, and the end face of the connector, which is limited, fits against the second plane. The base 1 also has multiple mounting through holes 1f, which are distributed around the circular hole 1d.

[0031] Multiple bolts 3 are sequentially inserted into multiple mounting through holes 1f of the base 1, and threaded holes for threaded connection of the bolts 3 are provided at corresponding positions on the intermediate housing. These bolts 3 are used to establish or disconnect the fixed connection between the mounting base and the intermediate housing.

[0032] Please see Figure 1 , Figure 2 and Figure 3 In some embodiments, the mounting through hole 1f is a stepped hole, including a first hole 1f1 for the bolt 3 to pass through and a second hole 1f2 for the protrusion on the intermediate housing to enter. That is, a protrusion is provided at a corresponding position on the intermediate housing, and a threaded hole for the bolt 3 to be threaded is provided on the protrusion.

[0033] The protrusion of the intermediate housing enters the second hole 1f2 of the base body 1, and then the first side 1a of the base body 1 fits against the intermediate housing, completing the positioning of the mounting seat in the intermediate housing, making it easier to make the second side 1c vertical after the mounting seat is installed in the intermediate housing.

[0034] Please see Figure 1 The spherical plain bearing 2 is installed within the circular hole 1d of the housing 1. In other words, more specifically, the "top of the butt joint enters the circular hole 1d" mentioned above means that the top of the butt joint enters the spherical plain bearing 2. The universal rotation characteristic of the spherical plain bearing 2 eliminates assembly tolerances that may arise during installation and optimizes the stress distribution in the central hole of the mounting base.

[0035] In some embodiments, the seat 1 may be assembled from two parts, and the circular hole 1d is also formed by these two parts; the spherical bearing 2 may be a single inner ring; the spherical bearing 2 is installed into the circular hole 1d at the same time as the seat 1 is assembled.

[0036] In some embodiments, the base 1 may be a single piece; the spherical bearing 2 may consist of an inner ring and an outer ring; the outer ring is fixedly connected to the base 1.

[0037] Please see Figure 2 , Figure 3 and Figure 5In some embodiments, the base 1 can be a single piece; the spherical bearing 2 can be a single inner ring; and the circular hole 1d can be a through hole. The first end of the circular hole 1d is used to block the spherical bearing 2. That is, this end of the circular hole 1d is fitted to the outer spherical surface of the spherical bearing 2, and the spherical bearing 2 cannot leave this end of the circular hole 1d regardless of its rotation angle. The second end of the circular hole 1d has two opposing limiting protrusions 1d1 in the first direction. When the annular planes at both ends of the spherical bearing 2 are also opposite in the first direction, it can be installed / removed from the base 1.

[0038] More specifically, taking installation as an example, the annular planes at both ends of the spherical bearing 2 are opposite each other in the first direction. The spherical bearing 2 is inserted into the circular hole 1d between the two limiting protrusions 1d1 until the spherical bearing 2 abuts against the first end of the circular hole 1d. The spherical bearing 2 is then rotated so that the annular planes at both ends of the spherical bearing 2 correspond to the two ends of the circular hole 1d respectively. At the same time, the spherical bearing 2 is blocked by the first end of the circular hole 1d and also by the two limiting protrusions 1d1.

[0039] Preferably, the mounting between the spherical plain bearing 2 and the housing 1 adopts the third embodiment described above. The housing 1 can be integrally machined from 17-4PH stainless steel to ensure strength. Compared with the first two embodiments, the third embodiment takes into account the strength of the housing 1, the stability of the connection between the spherical plain bearing 2 and the housing 1, and the convenience of installation / removal between the spherical plain bearing 2 and the housing 1.

[0040] Please see Figure 3 In some embodiments, for the base 1, two limiting protrusions 1d1 are located at the end of the circular hole 1d near the first side surface 1a. More specifically, the circular hole 1d can be a groove 1b corresponding to the first side surface 1a, and a hole position 1b1 with a larger diameter communicating with the circular hole 1d can be provided on the groove wall of the groove 1b.

[0041] Please see Figure 1 and Figure 5 The hoisting part 4 is provided with a hoisting hole 4a and is fixedly connected to the top of the base 1.

[0042] In some embodiments, the top of the base 1 has a threaded hole 1g for threaded connection and fixation of the lifting part 4. That is, the lifting part 4 has a threaded rod. The threaded connection ensures stability at the connection between the lifting part 4 and the base 1, and also allows for convenient fine-tuning of the orientation of the lifting hole 4a by rotating the lifting part 4. The axis of the threaded hole 1g is perpendicular to the axis of the circular hole 1d. After the mounting base is installed in the intermediate housing, the second side 1c is vertical; correspondingly, the threaded hole 1g is also vertical. This, combined with the upward vertical tension applied to the lifting hole 4a, makes the connection between the lifting part 4 and the base 1 more stable.

[0043] In some embodiments, the mounting base also includes an annular damping pad 5. The damping pad 5 is fixedly connected to the second side surface 1c of the base body 1, corresponding to the circular hole 1d. That is, regarding the above-mentioned "fitting of the end face of the butt joint limiting and the second plane", after the damping pad 5 is installed on the first side surface 1a, the end face of the butt joint limiting and the damping pad 5 become fitted together. The damping pad 5 can be made of polyurethane material to reduce the vibration transmission between the top head and the mounting base and the engine.

Claims

1. An intermediate gearbox mounting for an aeroengine, characterised in that, The utility model relates to a kind of intermediate machine cabinet lifting device, including: The seat body (1), first side (1a) is cambered surface, for fitting intermediate machine cabinet;First side (1a) is also equipped with recess (1b) for avoiding the interference of intermediate machine cabinet surface;And the second side (1c) opposite to first side (1a) is plane;Second side (1c) is also equipped with round hole (1d) along its normal in the middle;The seat body (1) is also equipped with multiple mounting through holes (1f) around round hole (1d); Multiple bolts (3) are sequentially arranged in multiple mounting through holes (1f) of the seat body (1); Knuckle bearing (2) is installed in round hole (1d) of the seat body (1); Hoisting part (4) is provided with lifting hole (4a), and is fixedly connected to the top of the seat body (1).

2. An aircraft engine intermediate casing mounting as claimed in claim 1, characterised in that, The seat body (1) is integrated, and the knuckle bearing (2) is single inner ring;Round hole (1d) is through hole, and the first end of round hole (1d) is used to stop knuckle bearing (2), and the second end is provided with two limit protrusions (1d1) in the first direction;When the annular plane of both ends of the knuckle bearing (2) is opposite in the first direction, it can be installed / detached from the seat body (1).

3. An aircraft engine intermediate casing mounting as claimed in claim 2, characterised in that, Two limit protrusions (1d1) are close to the end of first side (1a) in round hole (1d).

4. An aircraft engine intermediate casing mounting as claimed in claim 1, characterised in that, The top of the seat body (1) is provided with threaded hole (1g) for threadedly connecting and fixing the hoisting part (4), and the axis of threaded hole (1g) is perpendicular to the axis of round hole (1d).

5. An aircraft engine intermediate casing mounting as claimed in claim 1, characterised in that, It also includes annular shock pad (5), fixedly connected to the second side (1c) of the seat body (1), and corresponding with round hole (1d).

6. An aircraft engine intermediate casing mounting as claimed in claim 1, characterised in that, Mounting through hole (1f) is stepped hole, including: first hole (1f1) for bolt (3) to pass through and second hole (1f2) for the protrusion on intermediate machine cabinet to enter.

Images