CN111622810A

CN111622810A - Connection device, gas turbine engine, connection piece and turbine outer ring

Info

Publication number: CN111622810A
Application number: CN201910145240.3A
Authority: CN
Inventors: 郭洪宝; 谢骏; 梅文斌
Original assignee: AECC Commercial Aircraft Engine Co Ltd
Current assignee: AECC Commercial Aircraft Engine Co Ltd
Priority date: 2019-02-27
Filing date: 2019-02-27
Publication date: 2020-09-04
Anticipated expiration: 2039-02-27
Also published as: CN111622810B

Abstract

The invention relates to a connecting device, a gas turbine engine, a connecting piece and a turbine outer ring. Wherein the connecting device comprises a first member, a second member and a connecting piece. The first member has an annular rib provided at an outer periphery thereof, the annular rib having a plurality of first grooves in a circumferential direction; a second member disposed around an outer periphery of the first member; the connecting piece includes pole portion, piece portion, wherein, correspond every first groove, be provided with one the connecting piece, the connecting piece the piece portion is put into in the first groove. The connecting device has the advantage of reliable connection, and the gas turbine engine has the advantage of good overall performance.

Description

Connection device, gas turbine engine, connection piece and turbine outer ring

Technical Field

The invention relates in particular to a connection device, a gas turbine engine, a connection piece and a turbine outer ring structure.

Background

Gas turbine engine components often need to withstand extremely high temperatures, such as the outer turbine ring, as the primary turbine stationary part of an aircraft engine, which is subjected to high ambient temperatures in service. At present, the turbine outer ring component is mainly prepared from a high-temperature alloy material, but the strength and the rigidity of the high-temperature alloy material are obviously reduced in a high-temperature environment, so that the upper limit of the service temperature of the turbine outer ring component is influenced, and the improvement of the overall performance of an aeroengine is limited finally. The Ceramic Matrix Composite (CMC) is used for replacing a high-temperature alloy material to prepare the aeroengine turbine outer ring component, the characteristics of small CMC density, excellent high-temperature mechanical property and good thermal stability can be fully exerted, the upper limit of the use temperature of the turbine outer ring component is improved, the amount of related cooling gas is reduced, and the CMC has important effects on remarkably improving the overall efficiency of a gas turbine engine and reducing pollution emission. However, the difference in thermal expansion coefficient between CMC and superalloy material may cause significant thermal mismatch stress to the connection mounting structure between the CMC turbine outer ring component and the engine metal casing during temperature change, which may affect the safety and reliability of the component itself and the connection structure.

Accordingly, there is a need in the art for a connection arrangement, connection member, and turbine outer ring that securely and reliably connects components of different coefficients of thermal expansion to improve the overall performance of a gas turbine engine.

Disclosure of Invention

It is an object of the present invention to provide a connection device.

It is an object of the present invention to provide a gas turbine engine.

It is an object of the present invention to provide a connector.

It is an object of the present invention to provide a turbine outer ring.

A connecting device according to an aspect of the present invention includes a first member having at least one annular rib provided at an outer periphery thereof, each of the annular ribs having a plurality of first grooves in a circumferential direction, the first grooves having first side wall surfaces and second side wall surfaces spaced apart in the circumferential direction of the first member and groove openings formed at outer peripheries of the annular ribs, the first side wall surfaces and the second side wall surfaces being inclined with respect to a radial direction of the first member, a spacing distance between the first side wall surfaces and the second side wall surfaces in the circumferential direction defining a groove width of the first groove, the groove width gradually decreasing in a direction in which the groove opens; a second member disposed around an outer periphery of the first member; a connector comprising a stem portion, the stem portion comprising a threaded segment; and a block portion connected to the rod portion and having a gradually-expanding width portion gradually increasing in width toward an opposite side of the block portion to the rod portion, thereby forming a third slope and a fourth slope on both sides of the gradually-expanding width portion; the connecting piece is arranged corresponding to each first groove, the block part of the connecting piece is placed in the first groove, the third inclined surface is in compression fit with the first side wall surface, the fourth inclined surface is in compression fit with the second side wall surface, and the rod part protrudes out of the annular rib plate and is connected with the second component.

In an embodiment of the connecting device, the first side wall surface and the second side wall surface of the first groove have the same inclination angle, and an intersection point of extension lines of the first side wall surface and the second side wall surface is located at an outer peripheral edge of the annular rib plate.

In an embodiment of the connecting device, the tapered width portion is bifurcated to form the third slope and the fourth slope from an end near the rod portion.

In an embodiment of the connection device, a radial gap is present between the bottom of the first groove and the place where the width of the width-diverging part is largest.

In an embodiment of the connecting device, the first groove further has a third side wall surface and a fourth side wall surface spaced apart in a circumferential direction of the first member, one end of the third side wall surface is connected to the first side wall surface, and the other end is located at an outer peripheral edge of the annular rib plate, one end of the fourth side wall surface is connected to the second side wall surface, and the other end is located at an outer peripheral edge of the annular rib plate; the third side wall surface and the fourth side wall surface are parallel to the radial direction of the first member; the connecting piece is also provided with a width constant part, a third plane and a fourth plane are formed on two sides of the width constant part, one end of the width constant part is connected with the rod part, and the other end of the width constant part is connected with the width gradually-expanding part; and a circumferential gap is formed between the third side wall surface and the third plane, and between the fourth side wall surface and the fourth plane.

In an embodiment of the connection device, the rod portion further includes an optical section, one end of the optical section is connected to the block portion, and the other end of the optical section is connected to the threaded section; the second component is provided with a through hole which is penetrated by the corresponding connecting piece, and the thread section is connected with the second component through a bolt connecting structure.

In an embodiment of the connecting device, each of the annular ribs has an odd number of the plurality of first grooves, the light sections of the corresponding connecting members of the first grooves located at intermediate positions between the odd number of first grooves are closely fitted with the corresponding through holes, and gaps in a circumferential direction of the light sections exist between the light sections of the remaining connecting members and the corresponding through holes.

In an embodiment of the connecting device, the second member of the connecting device includes a second groove, and the second groove includes two axially adjacent partition plates disposed on an outer periphery of the second member to define an accommodating space, and is in snap-fit connection with the axial end wall of the block portion.

In an embodiment of the connecting device, the second member comprises at least one second groove extending in the axial direction, wherein the two partitions of one second groove are pressed against the axial end walls of the corresponding annular rib, and the two partitions of the remaining second groove are axially spaced from the axial end walls of the corresponding annular rib.

In an embodiment of the connection device, the first member is made of a ceramic matrix composite material, and the second member and the connection member are made of a metallic material.

A gas turbine engine according to another aspect of the present invention includes the connection device of any one of the above, the first member is a turbine outer ring, and the second member is an intermediate case.

A connector according to yet another aspect of the present invention comprises a shank comprising a threaded segment; and a block portion connected to the rod portion and having a gradually-expanding width portion gradually increasing in width toward an opposite side of the block portion to the rod portion, thereby forming a third slope and a fourth slope on both sides of the gradually-expanding width portion.

A turbine outer ring according to still another aspect of the present invention has an annular rib provided at an outer periphery thereof, the annular rib having a plurality of first grooves in a circumferential direction, the first grooves having first and second side wall surfaces spaced apart in the circumferential direction of the turbine outer ring and a groove opening formed at an outer periphery of the annular rib, the first and second side wall surfaces being inclined with respect to a radial direction of the turbine outer ring, a distance of separation in the circumferential direction between the first and second side wall surfaces defining a groove width of the first groove, the groove width gradually decreasing in a direction of the groove opening.

The invention has the advantages that at least the connecting device with the first groove and the connecting piece which are provided with the inclined surfaces which are mutually pressed and matched is arranged, the thermal mismatch is relieved by the arrangement of the inclined surfaces, the contact and transmission surfaces of the installation loads are always kept to be tightly matched, and the reliable radial mechanical connection of the first component and the second component with different thermal expansion coefficients can be realized. Meanwhile, the difficulty of the ceramic-based outer ring component in the aspects of preparation forming, subsequent processing and installation implementation is favorably reduced, the metal connecting piece is favorably far away from a service high-temperature area, and the structure has higher connection strength, reliability and upper limit of service temperature. In addition, for the gas turbine engine, by adopting the connecting device, the operation is more reliable, and the upper limit of the temperature of the component is increased, so that the cooling gas quantity of the component is reduced, the heat efficiency of the engine is improved, and the overall performance of the engine is improved.

Drawings

The above and other features, properties and advantages of the present invention will become more apparent from the following description of the embodiments in conjunction with the accompanying drawings, it being noted that the drawings are given by way of example only and are not drawn to scale, and should not be taken as limiting the scope of the invention which is actually claimed, wherein:

fig. 1 is a schematic structural diagram of a connecting device according to an embodiment.

Fig. 2 is a schematic view of the structure of the connection piece and the first groove of the connection device according to fig. 1.

Fig. 3 is a side view according to fig. 1.

Fig. 4 is a cross-sectional view F-F according to fig. 3.

Fig. 5 is a top view according to fig. 1.

Fig. 6 is a cross-sectional view P-P according to fig. 5.

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 do not limit the scope of the 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.

Further, it is to be understood that the positional or orientational relationships indicated by the terms "front, rear, upper, lower, left, right", "transverse, vertical, horizontal" and "top, bottom" and the like are generally based on the positional or orientational relationships illustrated in the drawings and are provided for convenience in describing the invention and for simplicity in description, and that these terms are not intended to indicate and imply that the referenced devices or elements must be in a particular orientation or be constructed and operated in a particular orientation without departing from the scope of the invention. Also, this application uses specific language to describe embodiments of the application. The terms "inside" and "outside" refer to the inner and outer parts relative to the outline of each part itself, and the terms "first" and "second" are used to define the parts, and are used only for the convenience of distinguishing the corresponding parts, and the terms do not have any special meaning unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited. Reference throughout this specification to "one embodiment," "an embodiment," and/or "some embodiments" means that a particular feature, structure, or characteristic described in connection with at least one embodiment of the present application is included in at least one embodiment of the present application. Therefore, it is emphasized and should be appreciated that two or more references to "an embodiment" or "one embodiment" or "an alternative embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, some features, structures, or characteristics of one or more embodiments of the present application may be combined as appropriate.

Referring to fig. 1 and 2, in some embodiments, a connection device includes a first member 1, a connector 2, and a second member 3; in the embodiment, the connecting device is located in a gas turbine engine, the first component 1 is a turbine outer ring of the gas turbine engine and is made of ceramic matrix composite material, the second component 3 is an intermediate casing, the second component 3 is arranged around the outer periphery of the first component 1, the connecting piece 2 and the second component 3 are made of metal material, in the gas turbine engine, high-temperature alloy material is generally adopted, and therefore the thermal expansion coefficient of the connecting piece 2 and the second component 3 is larger than that of the first component 1. The first member 1 has at least one annular rib 6 provided on the outer periphery thereof, and the number of the annular ribs 6 may be two as shown in fig. 1, but is not limited thereto. Each annular rib 6 has a plurality of first grooves 7 in the circumferential direction, the first grooves 7 have first side wall surfaces 71 and second side wall surfaces 72 spaced apart in the circumferential direction of the first member 1, and groove openings 73 formed in the outer periphery of the annular rib 6, the first side wall surfaces 71 and the second side wall surfaces 72 are inclined with respect to the radial direction of the first member 1, and the distance between the first side wall surfaces 71 and the second side wall surfaces 72 in the circumferential direction defines a groove width D of the first grooves 7, and as shown in fig. 1 and 2, the groove width D of the first grooves 7 gradually decreases toward the direction of the groove openings 73. With continued reference to fig. 1 and 2, the connector 2 comprises a stem portion 21 and a block portion 22, the stem portion 21 comprising a threaded segment 211; the rod portion 21 connects the block portion 22, the block portion 22 has a gradually expanding width portion 221, and the width of the gradually expanding width portion 221 gradually increases from the opposite side to the rod portion 21 side, so that a third inclined surface 2211 and a fourth inclined surface 2212 are formed on both sides of the gradually expanding width portion 221. As shown in fig. 1 and 2, a connecting member 2 is provided corresponding to each first groove 7, the block portion 22 of the connecting member 2 is inserted into the first groove 7, the third inclined surface 2211 is press-fitted to the first side wall surface 71, the fourth inclined surface 2212 is press-fitted to the second side wall surface 72, and the rod portion 21 protrudes from the annular rib 6 and is connected to the second member 3. The third inclined surface 2211 and the fourth inclined surface 2212 are arranged on the connecting piece 2, and the first groove 7 of the first member 1 is provided with the inclined first side wall surface 71 and the inclined second side wall surface 72, so that in the process of temperature change, relative sliding along the tangential direction of a contact tangent plane occurs between the block part 22 of the connecting piece 2 and the first groove 7, as shown in the direction of a dotted arrow E of fig. 2, a double-headed arrow represents two temperature change conditions including heating and cooling, and through the relative sliding, the thermal deformation difference of the first member 1 and the connecting piece 2 in the process of temperature change caused by different materials of the first member 1 and the connecting piece 2 can be released, and the phenomenon of jamming caused by relative displacement along the normal direction of the contact plane between the connecting piece 2 and the first groove 7 can be reduced as much as possible. And the relative sliding along the tangential direction of the contact tangent plane can keep the tight fit on the contact surface, ensure the connection strength and also ensure that the contact stress and the installation pretightening force are basically kept constant.

With continued reference to fig. 1 and 2, the first groove 7 may have a specific structure that the first side wall 71 and the second side wall 72 of the first groove 7 have the same inclination angle, that is, the first side wall 71 and the second side wall 72 of the first groove 7 are symmetrical, and the inclination angle α satisfies the extension line L of the first side wall 71 and the second side wall 72₁、L₂The inclination angle α is set so that the block portion 22 of the connector 2 and the first groove 7 can slide relatively only in the tangential direction of the contact slope during the temperature variation without any tendency to displace in the normal direction, and the thermal mismatch problem of the first member 1 and the connector 2 is completely solved, it is understood that the inclination angle of the third and

fourth slopes

2211 and 2212 of the corresponding connector 2 is the same as that of the corresponding first and second

side wall surfaces

71 and 72, further, as shown in fig. 1 and 2, the width gradually expanding portion 221 of the connector 2 is bifurcated, and is bifurcated from the end near the rod portion to form the third and

fourth slopes

2211 and 2212,one skilled in the art will appreciate that other configurations of tapered width sections 221 exist, such as a solid tapered width section 221. However, the use of the diverging section 221 provides the advantage that the diverging shape provides a weight reduction effect compared to a solid structure, which is particularly suitable for gas turbine engines with high requirements for weight reduction, while the light diverging section 221 reduces the thermal stresses that may occur during thermal expansion of the connection. Specifically, in some embodiments, as shown in fig. 2, a radial gap a1 exists between the maximum width of the width gradually expanding part 221 and the bottom of the first groove 7, so that a certain sliding space can be reserved for the tangential sliding of the connecting piece 2 along the contact surface.

With continued reference to fig. 1 and 2, in an embodiment, the first groove 7 further has a third side wall surface 74 and a fourth side wall surface 75 spaced apart along the circumferential direction of the first member 1, one end of the third side wall surface 74 is connected to the first side wall surface 71, the other end is located at the outer periphery of the annular rib 6, one end of the fourth side wall surface 75 is connected to the second side wall surface 72, and the other end is located at the outer periphery of the annular rib 6; the third and fourth

side wall surfaces

74 and 75 are parallel to the radial direction of the first member 1; accordingly, the connector 2 further has a width-constant portion 222, and a third plane 2221 and a fourth plane 2222 are formed at both sides of the width-constant portion 222, and one end of the width-constant portion 222 is connected to the rod portion 21 and the other end is connected to the width-gradually-expanding portion 221, wherein a circumferential gap a2 exists between the third side wall surface 74 and the third plane 2221 and between the fourth side wall surface 75 and the fourth plane 2222 to reserve a thermal expansion space. The transition of the constant width part 222 between the gradually expanding width part 221 and the rod part 21 can ensure the radial connection strength between the connection member 2 and the second member 3.

Referring to fig. 1 to 4, in some embodiments, the specific structure of the rod portion 21 further includes an optical section 212, one end of the optical section 212 is connected to the block portion 22, and the other end is connected to the threaded section 211; the second component 3 is provided with a through hole 8 corresponding to the connection part 2, the threaded section 211 is connected with the second component through a bolt connection structure, in the installation process, the threaded section 211 of the connection part 2 penetrates through the through hole 8 on the second component 3 and protrudes out of the outer ring surface of the second component 3, then the elastic gasket 5 and the tightening nut 4 are sequentially installed on the threaded section 211 of the connection part 2 in a matched mode and apply tightening torque, and therefore mechanical connection installation and application of pre-tightening force between the first component 1 and the second component 3 are completed. Adopt bolted connection structure, easily installer operation, the convenience is adjusted the pretightning force to its bearing capacity is stronger, and the structure is more firm reliable. Specifically, as shown in fig. 3 and 4, the number of the plurality of first grooves 7 corresponding to each annular rib 6 is odd, the light section 212 of the corresponding connecting member 2 of the first groove 7 located at the middle position between the odd number of first grooves 7 is tightly fitted with the corresponding through hole 8, and a gap B1 exists between the light section 212 of the rest of the connecting pieces and the corresponding through hole 8 along the circumferential direction of the light section 212, so that the beneficial effect of the arrangement is that the central first groove 7 is tightly matched with the through hole 8, thereby limiting the relative displacement of the first member 1 with respect to the second member 3 in the direction of rotation, while the presence of the mating gap B1 of the light segment 212 of the remaining connector 2 and the through hole 8, allows the relative sliding of the non-centered connector 2 with respect to the second member 3, thereby alleviating the thermal deformation mismatch between different connecting pieces 2 and the second member 3 on the same mounting rib 6 of the first member 1.

With reference to fig. 1, in some embodiments, the particular structure of the connection device may also be such that the second member 3 of the connection device comprises second grooves 9, the number of second grooves 9 corresponding to the number of annular ribs 6. The second groove 9 includes two axially

adjacent partitions

91 and 92 provided on the outer periphery of the second member 3, and defines a receiving space 90, which is engaged with the axial end wall 25 (the other end wall is not shown) of the connector 2. This achieves a surface contact constraint for the connector 2 and includes a large area of the annular rib 6, limiting axial displacement of the connector 2 relative to the annular rib 6, making the connection more stable. Further, as shown in fig. 1, 5 and 6, when the first member 1 has a plurality of annular ribs 6, the second member 3 also has a plurality of second grooves 9 distributed in the axial direction, two

partitions

91 and 92 of one second groove 9 are pressed against the axial end wall of the corresponding annular rib 6, and two

partitions

91 and 92 of the other second grooves 9 have an axial clearance C1 with the axial end wall of the corresponding annular rib 6. With the second groove 9 and the annular rib 6 having the axial clearance C1, the axial width of the block portion 22 of the corresponding connector 2 is larger than the axial width of the corresponding annular rib 6, so that the two

partition plates

91 and 92 of the second groove 9 and the block portion 22 of the connector 2 are held in press-fit engagement. The axial clearance C1 can allow relative sliding of this annular rib 6 with respect to the connecting member 2 and the second member 3 in the engine axial direction, thereby alleviating the problem of thermal deformation mismatch between the different annular ribs 6 on the first member 1 and the second member 3. It will be understood that when there is only one annular rib 6, and therefore only one second groove 9, the two

partitions

91, 92 of the second groove 9 and the axial end wall of the corresponding annular rib 6 are pressed together to ensure the stability of the connection.

In summary, the connecting device, the gas turbine engine, the connecting member, and the turbine outer ring according to the above embodiments have the advantages that the connecting device at least includes the first groove having the mutually press-fitted inclined surfaces and the connecting member, the thermal mismatch is alleviated by the inclined surface, the contact and transfer surfaces of the respective mounting loads are always kept in close fit, and the reliable radial mechanical connection of the first member and the second member with different thermal expansion coefficients can be realized. Meanwhile, the difficulty of the ceramic-based outer ring component in the aspects of preparation forming, subsequent processing and installation implementation is favorably reduced, the metal connecting piece is favorably far away from a service high-temperature area, and the structure has higher connection strength, reliability and upper limit of service temperature. In addition, for the gas turbine engine, by adopting the connecting device, the operation is more reliable, and the upper limit of the temperature of the component is increased, so that the cooling gas quantity of the component is reduced, the heat efficiency of the engine is improved, and the overall performance of the engine is improved.

Although the present invention has been disclosed in the above-mentioned embodiments, it is not intended to limit the present invention, and those skilled in the art may make variations and modifications without departing from the spirit and scope of the present invention. Therefore, any modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope defined by the claims of the present invention, unless the technical essence of the present invention departs from the content of the present invention.

Claims

1. A connection device, comprising:

a first member having at least one annular rib provided on an outer periphery thereof, each of the annular ribs having a plurality of first grooves in a circumferential direction, the first grooves having first and second side wall surfaces spaced apart in the circumferential direction of the first member and a groove opening formed in the outer periphery of the annular rib, the first and second side wall surfaces being inclined with respect to a radial direction of the first member, a distance of the spacing between the first and second side wall surfaces in the circumferential direction defining a groove width of the first groove, the groove width gradually decreasing in a direction of the groove opening;

a second member disposed around an outer periphery of the first member;

a connecting piece, comprising

A shaft comprising a threaded section; and

a block portion connected to the rod portion and having a gradually expanding width portion gradually increasing in width toward an opposite side of the block portion to the rod portion side, thereby forming a third slope and a fourth slope on both sides of the gradually expanding width portion;

the connecting piece is arranged corresponding to each first groove, the block part of the connecting piece is placed in the first groove, the third inclined surface is in compression fit with the first side wall surface, the fourth inclined surface is in compression fit with the second side wall surface, and the rod part protrudes out of the annular rib plate and is connected with the second component.

2. The connecting device according to claim 1, wherein the first side wall surface and the second side wall surface of the first groove are inclined at the same angle, and an intersection point of extension lines of the first side wall surface and the second side wall surface is located at an outer peripheral edge of the annular rib.

3. The connecting device as claimed in claim 1, wherein said diverging width portion is bifurcated to form said third and fourth inclined surfaces from an end adjacent to the shaft portion.

4. The connecting device according to claim 1, wherein a radial gap exists between the bottom of the first groove and the place where the width of the width-diverging portion is largest.

5. The connection device of claim 1,

the first groove is also provided with a third side wall surface and a fourth side wall surface which are spaced along the circumferential direction of the first member, one end of the third side wall surface is connected with the first side wall surface, the other end of the third side wall surface is positioned on the outer peripheral edge of the annular rib plate, one end of the fourth side wall surface is connected with the second side wall surface, and the other end of the fourth side wall surface is positioned on the outer peripheral edge of the annular rib plate; the third side wall surface and the fourth side wall surface are parallel to the radial direction of the first member;

the connecting piece is also provided with a width constant part, a third plane and a fourth plane are formed on two sides of the width constant part, one end of the width constant part is connected with the rod part, and the other end of the width constant part is connected with the width gradually-expanding part;

and a circumferential gap is formed between the third side wall surface and the third plane, and between the fourth side wall surface and the fourth plane.

6. The connecting device of claim 1 wherein said shank portion further comprises an optical section, said optical section being connected at one end to said block portion and at another end to said threaded section; the second component is provided with a through hole which is penetrated by the corresponding connecting piece, and the thread section is connected with the second component through a bolt connecting structure.

7. The connecting device according to claim 6, wherein each of the annular ribs has an odd number of the plurality of first grooves, the optical section of the corresponding connecting member of the first groove located at an intermediate position between the odd number of first grooves is fitted closely to the corresponding through hole, and a gap exists between the optical sections of the remaining connecting members and the corresponding through holes along a circumferential direction of the optical section.

8. A connection device according to claim 1, wherein the second member of the connection device comprises a second groove comprising two axially adjacent partitions arranged at the periphery of the second member, defining a housing space, for snap-fitting connection with the axial end walls of the block portions.

9. The connecting device according to claim 8, wherein the second member comprises at least one second groove distributed in the axial direction, wherein the two partitions of one second groove are pressed against the axial end walls of the corresponding annular rib, and the two partitions of the remaining second groove are axially spaced from the axial end walls of the corresponding annular rib.

10. The connecting device according to any one of claims 1-9, wherein the first member is formed from a ceramic matrix composite material and the second member and the connecting member are formed from a metallic material.

11. A gas turbine engine comprising a coupling device according to any one of claims 1-10, wherein said first component is a turbine outer ring and said second component is an intermediate casing.

12. A connecting piece is characterized by comprising

A shaft comprising a threaded section; and

and a block portion connected to the rod portion and having a gradually expanding width portion gradually increasing in width toward a side opposite to the rod portion side of the block portion, thereby forming a third slope and a fourth slope on both sides of the gradually expanding width portion.

13. A turbine outer ring structure characterized by having an annular rib provided at an outer periphery thereof, the annular rib having a plurality of first grooves in a circumferential direction, the first grooves having a first side wall surface and a second side wall surface spaced apart in the circumferential direction of the turbine outer ring and a groove opening formed at an outer periphery of the annular rib, the first side wall surface and the second side wall surface being inclined with respect to a radial direction of the turbine outer ring, a distance of separation in the circumferential direction between the first side wall surface and the second side wall surface defining a groove width of the first groove, the groove width gradually decreasing in a direction of the groove opening.