CN212330856U

CN212330856U - Inner cavity fastener

Info

Publication number: CN212330856U
Application number: CN202021117542.4U
Authority: CN
Inventors: 杨波; 郑思凯; 姚星; 李志平
Original assignee: AECC Commercial Aircraft Engine Co Ltd
Current assignee: AECC Commercial Aircraft Engine Co Ltd
Priority date: 2020-06-16
Filing date: 2020-06-16
Publication date: 2021-01-12
Anticipated expiration: 2030-06-16

Abstract

The utility model provides an inner chamber fastener of easy assembly decomposition can realize the quick high quality assembly of aeroengine axle class interference fit spare in the limited annular inner chamber of operating space. The lumen fastener includes: the nut is an annular piece and is provided with a plurality of axial holes along the circumferential direction, and the axial holes are positioned on the upper end face of the nut; the wrench comprises a circular ring part and a handle, wherein the circular ring part is provided with a plurality of through holes along the circumferential direction, and the handle extends out of the circular ring part along the axial direction; and a plurality of screws corresponding to the plurality of axial holes and the plurality of through holes, respectively; the circular ring part of the wrench is overlapped on the upper end surface of the nut, the plurality of axial holes are respectively aligned with the plurality of through holes, and the plurality of screws respectively penetrate through the corresponding through holes and are in threaded connection with the axial holes.

Description

Inner cavity fastener

Technical Field

The utility model relates to an aeroengine assembling tool technical field, concretely relates to inner chamber fastener that is used for assembling the epaxial interference fit spare of aeroengine rotor in annular inner chamber.

Background

The shaft neck of the rotor shaft of the aircraft engine is fixed with interference fit pieces such as a bearing front sealing ring and a bearing inner ring in an interference fit mode, in order to ensure that the interference fit pieces are assembled in place, a hot-assembling mode is usually adopted, the sealing ring and the bearing inner ring are assembled on the shaft neck after being heated, and then all contact surfaces are pressed and attached in an annular process nut pressing mode. The process nut is large in thread diameter, and can be compressed and decomposed only by large external force, and in addition, when interference fit pieces at positions such as a low-pressure turbine rotor are assembled, the process nut is positioned in an annular inner cavity, so that the operation space is limited, and therefore, the process nut is difficult to assemble and decompose by using tools such as a general wrench.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an inner chamber fastener of easily assembling and decomposing can realize the quick high quality assembly of aeroengine axle class interference fit spare in the limited annular inner chamber of operating space.

To achieve the stated object, an inner cavity fastener for fitting an interference fit on an aircraft engine rotor shaft in an annular inner cavity, comprises: the nut is an annular piece and is provided with a plurality of axial holes along the circumferential direction, and the axial holes are positioned on the upper end face of the nut; the wrench comprises a circular ring part and a handle, wherein the circular ring part is provided with a plurality of through holes along the circumferential direction, and the handle extends out of the circular ring part along the axial direction; and a plurality of screws corresponding to the plurality of axial holes and the plurality of through holes, respectively; the circular ring part of the wrench is overlapped on the upper end surface of the nut, the plurality of axial holes are respectively aligned with the plurality of through holes, and the plurality of screws respectively penetrate through the corresponding through holes and are in threaded connection with the axial holes.

In one or more embodiments of the cavity fastener, the plurality of axial holes are uniformly distributed in the circumferential direction of the nut, and the plurality of through holes are uniformly distributed in the circumferential direction of the circular ring.

In one or more embodiments of the cavity fastener, a boss is provided on a lower end surface of the nut, and the boss is in contact with an end surface of the interference fit.

In one or more embodiments of the endoluminal fastener, the handle includes an axial extension connected at a lower end to the annular portion and at an upper end to a radial extension, the radial extension being a force application portion of the handle.

In one or more embodiments of the luminal fastener, the force applying portion is disposed outside the annular lumen.

In one or more embodiments of the endoluminal fastener, the screw is threadedly coupled to the perforation.

In one or more embodiments of the cavity fastener, the upper end surface of the nut is higher than the rear end surface of the aircraft engine rotor shaft when the interference fit is assembled.

The utility model discloses an inner chamber fastener links together nut and spanner through a plurality of screws, connects simply reliably, both can drive the nut rotation through the screw, can avoid again in-process at assembly and decomposition nut, and the spanner drops from the nut owing to receive too big external force, causes the damage of accurate spare parts such as bearing. The handle stretches out from the ring part along the axial direction to form a force arm, so that a larger moment can be applied to the handle to drive the nut to rotate, and the nut is assembled and disassembled. The spanner is fixed at the up end of nut, both can reduce radial dimension to limited operating space in the adaptation annular cavity, can drive the nut rotation through the frictional force between the lower surface of the ring portion of spanner and the up end of nut again, with the atress that reduces the screw, avoid the screw to warp because of the atress is too big, lead to being difficult to decompose screw and nut and spanner. The inner cavity fastener is simple in structure, low in machining and manufacturing cost, convenient to operate and high in assembling and disassembling efficiency, and can be used for realizing rapid high-quality assembly of an aero-engine shaft interference fit piece in an annular inner cavity with limited operating space.

Drawings

The above and other features, properties and advantages of the present invention will become more apparent from the following description of the embodiments with reference to the accompanying drawings, in which:

fig. 1 is a schematic view of a lumen fastener according to one or more embodiments.

FIG. 2 is a schematic illustration of a connection of a lumen fastener according to one or more embodiments.

FIG. 3 is a cross-sectional schematic view of a connection relationship of a nut to a rotor shaft and an interference fit according to one or more embodiments.

Fig. 4 is a partial schematic view at I in fig. 3.

Detailed Description

The following discloses many different embodiments or examples for implementing the subject technology described. Specific examples of components and arrangements are described below to simplify the present disclosure, but these are merely examples and are not intended to limit the scope of the present invention. For example, if a first feature is formed over or on a second feature described later in the specification, this may include embodiments in which the first and second features are formed in direct contact, and may also include embodiments in which additional features are formed between the first and second features, such that the first and second features may not be in direct contact. Additionally, reference numerals and/or letters may be repeated among the various examples throughout this disclosure. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. Further, when a first element is described as being coupled or coupled to a second element, the description includes embodiments in which the first and second elements are directly coupled or coupled to each other, as well as embodiments in which one or more additional intervening elements are added to indirectly couple or couple the first and second elements to each other. It is to be understood that the spatial relationship terms used in the specification are intended merely for convenience in description, and may encompass other orientations of the elements in addition to the orientation depicted in the figures. For example, if an element is turned over, elements described as "front," "front," or "front" of other elements or features may be oriented "rear" of the other elements or features, or turned over at a particular angle, may be oriented "left," "lower left," "right," etc. of the other elements or features.

Referring to fig. 1 to 4, the inner cavity fastener 4 of the present invention is used for assembling the interference fit 2 on the journal 11 of the aircraft engine rotor shaft 1 in the annular inner cavity 3, and the interference fit 2 includes a front bearing sealing ring 21 and a inner bearing ring 22. The bore fastener 4 includes a nut 5, a wrench 6 and a plurality of screws 7. The nut 5 is an annular member and is provided with a plurality of axial holes 51 along the circumferential direction, and the axial holes 51 are located on an upper end surface 52 of the nut 5. The wrench 6 includes a circular ring portion 61 and a handle 62, the circular ring portion 61 is provided with a plurality of perforations 611 in a circumferential direction, and the handle 62 axially protrudes from the circular ring portion 61. The plurality of screws 7 correspond to the plurality of axial holes 51 and the plurality of through holes 611, respectively.

When the nut 5 is assembled and disassembled by using the wrench 6, the ring part 61 of the wrench 6 is overlapped on the upper end surface 52 of the nut 5, the plurality of axial holes 51 are respectively aligned with the plurality of through holes 611, and the plurality of screws 7 respectively penetrate through the corresponding through holes 611 and are in threaded connection with the axial holes 51, so that the nut 5 is connected with the wrench 6, the connection is simple and reliable, the nut 5 can be driven to rotate by the screws 7, the phenomenon that the wrench 6 falls off from the nut 5 due to excessive external force in the process of assembling and disassembling the nut 5 is avoided, and the damage to precision parts such as a bearing is caused. The handle 62 extends out from the circular ring part 61 along the axial direction to form a force arm, so that a large moment can be applied to the handle 62 to drive the nut 5 to rotate, and the nut 5 is assembled and disassembled. The wrench 6 is fixed on the upper end face 52 of the nut 5, so that the radial size can be reduced to adapt to the limited operation space in the annular inner cavity 3, and the nut 5 can be driven to rotate by the friction force between the lower surface 612 of the annular part 61 of the wrench 6 and the upper end face 52 of the nut 5, so that the stress of the screw 7 is reduced, and the problem that the screw 7 is difficult to be separated from the nut 5 and the wrench 6 due to the deformation of the screw 7 caused by overlarge stress is avoided.

Referring to fig. 1, a plurality of axial holes 51 are uniformly distributed in the circumferential direction of the nut 5, and a plurality of through holes 611 are uniformly distributed in the circumferential direction of the annular portion 61. Therefore, the nut 5 and the plurality of screws 7 can be uniformly stressed, and deformation, fracture or blocking caused by local overlarge stress can be avoided.

Referring to fig. 2 to 4, the lower end surface 53 of the nut 5 is provided with a boss 531, and the nut 5 is in contact with the end surface of the interference fit 2 through the boss 531. From this, can reduce the machined surface of nut 5, reduce the processing degree of difficulty, avoid because of the contact surface is great, the processing degree of difficulty is great, lead to nut 5 and interference fit piece 2 binding face to have local high point, thereby lead to compressing tightly interference fit piece 2's in-process at nut 5, this local high point contacts earlier with interference fit piece 2 and produces too big pressure, with interference fit piece 2 local damage.

Referring to fig. 1 to 2, the handle 62 includes an axial extension 621 and a radial extension 622, the axial extension 621 is connected to the circular ring portion 61 at a lower end thereof and connected to the radial extension 622 at an upper end thereof, wherein the radial extension 622 is a force application portion of the handle 62. Therefore, the force applying part of the handle 62 can be arranged at a position with enough operation space, for example, the force applying part can be arranged outside the annular inner cavity 3 to obtain larger operation space, and the nut 5 can be assembled and disassembled conveniently.

With continued reference to fig. 1-2, the screw 7 and the aperture 611 may be threadably connected. Thus, the screw 7 can be assembled in advance to the wrench 6 so that the head of the screw 7 does not protrude beyond the lower surface 612 of the annular portion 61, the screw 7 can be stored, the tightening time for assembling and disassembling the nut 5 can be reduced, and the efficiency can be improved.

Referring to fig. 3 to 4, the nut 5 has a sufficient thickness such that when the nut 5 is used to press the interference fit 2 on the rotor shaft 1, the upper end surface 52 of the nut 5 is higher than the rear end surface 12 of the rotor shaft 1. Thereby, it is possible to avoid the wrench 6 from contacting the rotor shaft 1 during the process of assembling and disassembling the nut 5, causing damage to the rotor shaft 1.

Referring to fig. 2, the operation steps of assembling the nut 5 with the wrench 6 of the present invention are as follows:

1. screwing the screw 7 onto the wrench 6 so that the head of the screw 7 does not extend beyond the lower surface 612 of the annular portion 61 of the wrench 6;

2. placing the annular portion 61 of the wrench 6 onto the upper end face 52 of the nut 5, rotating the wrench 6 so that the screw 7 is aligned with the axial hole 51 of the nut 5;

3. screwing the screw 7 so that the screw 7 is inserted into the axial hole 51 of the nut 5 to integrally connect the wrench 6 and the nut 5;

4. the nut 5 is driven to rotate by adding an extension rod at the handle 62 or hammering the handle 62 by a hammer, so that the binding surface of the interference fit piece 2 is pressed;

5. loosening the screw 7 so that the screw 7 is disengaged from the axial hole 51 of the nut 5;

6. the wrench 6 is removed from the upper end surface 52 of the nut 5.

The operation steps of disassembling the nut 5 by using the wrench 6 of the present invention are similar to the above steps, but the direction of the force applied to the handle 62 is opposite.

Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, any modification, equivalent changes and modifications made to the above embodiments according to the technical spirit of the present invention, all without departing from the content of the technical solution of the present invention, fall within the scope of protection defined by the claims of the present invention.

Claims

1. An inner cavity fastener for assembling an interference fit on an aircraft engine rotor shaft in an annular inner cavity, comprising:

the nut is an annular piece and is provided with a plurality of axial holes along the circumferential direction, and the axial holes are positioned on the upper end face of the nut;

the wrench comprises a circular ring part and a handle, wherein the circular ring part is provided with a plurality of through holes along the circumferential direction, and the handle extends out of the circular ring part along the axial direction; and

a plurality of screws respectively corresponding to the plurality of axial holes and the plurality of through holes;

the circular ring part of the wrench is overlapped on the upper end surface of the nut, the plurality of axial holes are respectively aligned with the plurality of through holes, and the plurality of screws respectively penetrate through the corresponding through holes and are in threaded connection with the axial holes.

2. The endoluminal fastener according to claim 1, wherein said plurality of axial holes are uniformly distributed in said circumferential direction of said nut, and said plurality of perforations are uniformly distributed in said circumferential direction of said annular portion.

3. The intracavity fastener of claim 1 wherein said nut is provided with a boss on a lower end surface thereof through which said boss contacts an end surface of said interference fit.

4. The endoluminal fastener according to claim 1, wherein the handle includes an axially extending portion and a radially extending portion, the axially extending portion having a lower end connected to the annular portion and an upper end connected to the radially extending portion, the radially extending portion being a force applying portion of the handle.

5. The lumen fastener of claim 4 wherein the force applying portion is disposed outside the annular lumen.

6. The endoluminal fastener according to claim 1, wherein said screw is threadedly connected to said aperture.

7. The cavity fastener of claim 1, wherein said upper end surface of said nut is raised above a rear end surface of said aircraft engine rotor shaft when said interference fit is assembled.