Pin assembly and connection assembly comprising same

Abstract

The application discloses a pin assembly and a connecting assembly comprising the same, which comprises a pin body and a pad, the pin body comprises a first fitting surface, the first fitting surface is located on the side surface of the pin body, the pad comprises a second fitting surface matched with the first fitting surface, the first fitting surface and the second fitting surface are spherical surfaces or ellipsoidal surfaces, and the outer side surfaces of the pin body and the pad jointly form a mounting surface of the pin assembly. After assembly, the first fitting surface of the pin is closely attached to the second fitting surface of the pad, when the pin is loaded and rotates relative to the pin hole, the pad does not rotate relative to the pin hole, and when the pin rotates relative to the pad, the first fitting surface and the second fitting surface always remain attached, so that the pin, the pad and the pin hole can always remain good attachment, local contact does not occur, and the strength failure and structural damage of the pin and the pin hole caused by excessively high contact stress are avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of aero-engine assembly, in particular to a pin assembly and a connecting assembly comprising the same. BACKGROUND

[0002] In the prior art, ceramic matrix composite (CMC) hot end components for aero-engines have been widely researched and applied in engineering, and the pin hole connecting structure is a commonly used assembly structure form between the CMC hot end component and the metal component. In engineering practice, the metal pin usually bears bending and shearing load, and after being loaded, it is easy to produce bending deformation and rotational displacement relative to the pin hole. In addition, the thermal deformation mismatch between the CMC hot end component and the metal component under high temperature environment can also cause the rotational displacement of the metal pin relative to the pin hole, so the outer surface of the metal pin and the inner ring surface of the CMC pin hole often do not fit well and form local contact during service. Local contact can cause the installation constraint load to act only on a very small contact area, and the smaller the area, the higher the contact stress, which can easily lead to strength failure and structural damage of the metal pin and the pin hole. U.S. Patent (Publication No. US2021047936A1) discloses a CMC element connecting pin. The CMC element connecting pin has an ellipsoidal portion, which is a mounting surface for connecting with the pin hole. The connecting pin is in surface contact with the pin hole through the ellipsoidal portion, thereby dispersing the load of the connecting pin to some extent. However, the rotatable displacement of the connecting pin after being loaded is limited, which can easily lead to strength failure and structural damage. SUMMARY

[0003] The technical problem to be solved by the present application is to overcome the defects of strength failure and structural damage of the pin and the pin hole caused by the relative displacement of the pin and the pin hole after being loaded in the prior art, and to provide a pin assembly and a connecting assembly comprising the same.

[0004] The present application solves the above technical problems by the following technical scheme: a pin assembly, characterized in that it comprises a pin body and a pad, the pin body comprises a first fitting surface, the first fitting surface is located on the side surface of the pin body, the pad comprises a second fitting surface matched with the first fitting surface, the first fitting surface and the second fitting surface are spherical surfaces or ellipsoidal surfaces, and the outer side surfaces of the pin body and the pad jointly form a mounting surface of the pin assembly.

[0005] In the present scheme, after assembly, the first fitting surface of the pin is in close contact with the second fitting surface of the spacer, when the pin is loaded and rotates relative to the pin hole, the spacer does not rotate relative to the pin hole, and when the pin rotates relative to the spacer, the first fitting surface and the second fitting surface always remain in close contact, so the pin, the spacer and the pin hole can maintain good contact, and local contact does not occur, avoiding excessive contact stress that leads to strength failure and structural damage of the pin and the pin hole.

[0006] Preferably, the pin body includes a first stepped surface arranged along the axial direction of the pin body, and the spacer includes a second stepped surface matched with the first stepped surface, and the first stepped surface is used to limit the rotation of the spacer around the axis of the pin.

[0007] In the present scheme, the first stepped surface and the second stepped surface are matched to prevent the spacer from rotating relative to the pin around the axis of the pin.

[0008] Preferably, the pin body includes a first end surface arranged along the radial direction of the pin body, and the spacer includes a second end surface matched with the first end surface, and a gap is arranged between the first end surface and the second end surface, and the first end surface is used to limit the displacement of the spacer along the axial direction of the pin body towards the first end surface.

[0009] In the present scheme, the first end surface arranged along the radial direction of the pin is matched with the second end surface to limit the large-scale movement of the spacer relative to the pin along the axial direction of the pin towards the pin, prevent the spacer from sliding out and falling, and the gap between the first end surface and the second end surface can prevent interference and limit the rotation displacement of the pin relative to the spacer.

[0010] Preferably, the spacer includes a notch at the top end and / or the bottom end, and the notch is located on one side of the second fitting surface.

[0011] In the present scheme, the notch allows the pin to rotate relative to the spacer within a small range, preventing interference and limiting the rotation displacement of the pin relative to the spacer.

[0012] Preferably, the top end of the spacer is provided with a boss, and the boss protrudes from the spacer on the side opposite to the second fitting surface.

[0013] In the present scheme, the boss can form a limit contact with the material around the pin hole, preventing the spacer from moving relative to the pin hole in the axial direction of the pin hole.

[0014] Preferably, the side surface of the pin body includes a recessed portion recessed inwardly, and the first stepped surface is located at the connection between the recessed portion and the non-recessed portion of the side surface.

[0015] In the present solution, the connection between the recessed part and the non-recessed part forms a drop, and the first step surface is arranged at the connection, so that the first step surface and the second step surface are more tightly in contact, and when the pin body and the pad are matched, the two are not easy to have protrusions or recesses at the connection of the side surfaces.

[0016] Preferably, the side surface of the pin body comprises a recessed part inwardly recessed, and the first end surface is located at the connection between the recessed part and the non-recessed part of the side surface.

[0017] In the present solution, the connection between the recessed part and the non-recessed part forms a drop, and the first step surface is arranged at the connection, so that the first step surface and the second step surface are more tightly in contact.

[0018] Preferably, the first fitting surface is located at the position of the recessed part.

[0019] In the present solution, the first fitting surface is arranged at the position of the recessed part, and in the installed state, the first fitting surface and the second fitting surface are more tightly fitted, and the structure is more compact.

[0020] Preferably, the first fitting surface protrudes outwardly along the radial direction of the pin body.

[0021] In the present solution, the first fitting surface is arranged to protrude outwardly, and compared with arranging the first fitting surface to be recessed inwardly, the strength of the pin body is higher.

[0022] Preferably, the pad is in the form of an open ring.

[0023] In the present solution, it is convenient to install the pin body from the open ring and the pad, and the installation efficiency is improved.

[0024] The application also discloses a connecting assembly comprising the pin assembly.

[0025] Preferably, there is a gap between the pad and the pin hole.

[0026] In the present solution, under high temperature environment, there is a problem of thermal deformation mismatch between the CMC hot end component and the metal component, and the gap can prevent the thermal mismatch stress from being too high due to the thermal deformation mismatch problem.

[0027] Preferably, the pad covers at least half of the area of the pin hole in the circumferential direction of the pin hole.

[0028] In the present solution, the larger the area covered by the pad in the circumferential direction of the pin hole, the larger the area of the first fitting surface and the second fitting surface that can be fitted, so that the contact stress is more dispersed.

[0029] Preferably, the height of the spacer is greater than the depth of the pin hole.

[0030] In this solution, the area of the first and second contact surfaces along the axial direction of the pin hole can be further increased to make the contact stress more dispersed.

[0031] The positive progress of the present application is that, after assembly, the first contact surface of the pin and the second contact surface of the spacer are in close contact, and when the pin rotates relative to the pin hole under load, the spacer does not rotate relative to the pin hole, and the first and second contact surfaces always remain in contact when the pin rotates relative to the spacer. Therefore, the pin, the spacer and the pin hole can maintain good contact, and local contact does not occur, avoiding the failure of the strength and structure of the pin and the pin hole due to excessive contact stress. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 FIG. 1 is a schematic view of a CMC hot end component and a pin assembly structure according to a preferred embodiment of the present application.

[0033] Figure 2 FIG. 2 is a schematic view of a CMC hot end component and a pin installation cross section according to a preferred embodiment of the present application.

[0034] Figure 3 FIG. 3 is a schematic view of a CMC hot end component structure according to a preferred embodiment of the present application.

[0035] Figure 4a 、 Figure 4b and Figure 4c FIG. 4 is a schematic view of a pin body structure according to a preferred embodiment of the present application.

[0036] Figure 5a 、 Figure 5b and Figure 5c FIG. 5 is a schematic view of a spacer structure according to a preferred embodiment of the present application.

[0037] Figure 6a and Figure 6b FIG. 6 is a schematic view of a pin and spacer assembly structure according to a preferred embodiment of the present application.

[0038] Figure 7 FIG. 7 is a schematic view of a pin and spacer initial assembly state cross section according to a preferred embodiment of the present application.

[0039] Figure 8 FIG. 8 is a schematic view of a pin and spacer relative rotation state cross section according to a preferred embodiment of the present application.

[0040] REFERENCE NUMERALS

[0041] CMC hot end component 1

[0042] Pin hole 11

[0043] pin 2

[0044] non-cylindrical section 21

[0045] first mating surface 211

[0046] first step surface 212

[0047] first end surface 213

[0048] cylindrical section 22

[0049] pad 3

[0050] second mating surface 31

[0051] outer ring cylindrical surface 32

[0052] notch 33

[0053] second step surface 34

[0054] boss 35

[0055] second end surface 36

[0056] metal part 4

[0057] first gap 41

[0058] second gap 42

[0059] pin initial state profile 5 DETAILED DESCRIPTION

[0060] The present application will be further described by way of example but without intending to limit the application to the described examples.

[0061] As Figures 1-8 shown, the present embodiment discloses a pin assembly, which comprises a pin 2 and a pad 3, the pin 2 comprises a first mating surface 211, the first mating surface 211 is located on the side of the pin 2, the pad 3 comprises a second mating surface 31 matched with the first mating surface 211, the first mating surface 211 and the second mating surface 31 are both spherical surfaces, and the outer surfaces of the pin 2 and the pad 3 jointly form a mounting surface of the pin 2 assembly. Wherein, the mounting surface composed of the pin 2 and the pad 3 is a cylindrical surface matched with the hole shape of the pin hole 11, so that there is still a certain activity gap after the pin 2 and the pad 3 are integrally installed into the pin hole 11. Specifically, in the present scheme, after the pin 2 and the pad 3 are installed in the pin hole 11, the first mating surface 211 and the second mating surface 31 are kept in close contact, when the pin 2 rotates relative to the pin hole 11 under load, the mounting surface of the pad 3 will not rotate relative to the pin hole 11 because it is fitted to the pin hole 11. Figure 8When the pin 2 rotates relative to the pad 3, the first fitting surface 211 and the second fitting surface 31 always remain fitted, so the pin 2, the pad 3 and the pin hole 11 can all maintain good fitting and will not have local contact, avoiding excessive contact stress that causes strength failure and structural damage of the pin 2 and the pin hole 11.

[0062] Specifically, as shown in Figure 4a 、 Figure 4b and Figure 4c , in the present embodiment, the pin 2 is of metal material, the pin 2 includes a cylindrical section 22 and a non-cylindrical section 21, the first fitting surface 211 is located at the non-cylindrical section 21 of the pin 2, the non-cylindrical section 21 is used for cooperating with the pad 3 for installation, and the cylindrical section 22 is used for connecting and fixing with the metal part 4, wherein the first fitting surface 211 and the second fitting surface 31 are both spherical surfaces, the first fitting surface 211 has the same radius size as the second fitting surface 31, in other embodiments, the first fitting surface 211 and the second fitting surface 31 can also be designed as ellipsoidal surfaces, the first fitting surface 211 and the second fitting surface 31 are set as spherical surfaces, which have better fitting effect when fitting, further reducing the possibility of local contact, wherein the proportion of the first fitting surface 211 in the area where the side of the pin 2 is located is half, that is, the proportion of the first fitting surface 211 in the area where the side of the pin 2 is located is less than half of the cylindrical section, and the pad 3 cooperating with the pin 2 is in the form of an open ring, that is, the pad 3 is in the form of a half ring. In other embodiments, the proportion of the first fitting surface 211 in the area where the side of the pin 2 is located can be less than half, that is, the proportion of the first fitting surface 211 in the area where the side of the pin 2 is located is less than half of the cylindrical section, and the pad 3 cooperating with the pin 2 is less than a half ring. Of course, in other embodiments, the proportion of the first fitting surface 211 can be larger, that is, the proportion of the first fitting surface 211 in the area where the side of the pin 2 is located can be greater than half, the proportion of the first fitting surface 211 is greater than half of the cylindrical section, and the greater the proportion of the first fitting surface 211 means the greater the area of the fitting surface of the pin 2 and the pad 3, so that the contact stress is more dispersed. The overall shape of the pad 3 is approximately rectangular cross-section and circular scanning, the scanning angle is less than 360°, that is, there is an opening, which is convenient for cooperating with the pin 2 for installation. As shown in Figure 4a 、 Figure 4b and Figure 4c and Figure 5a 、 Figure 5b and Figure 5cAs shown, in the embodiment, the pin 2 comprises a first step surface 212, the first step surface 212 is arranged along the axial direction of the pin 2, the spacer 3 comprises a second step surface 34 matched with the first step surface 212, the first step surface 212 is used to limit the rotation of the spacer 3 around the axis of the pin 2, and the cooperation between the first step surface 212 and the second step surface 34 can prevent the spacer 3 from rotating around the axis of the pin 2 relative to the pin 2 within a large range. In the embodiment, the first step surface 212 is arranged along the axial direction of the pin 2, wherein the axial direction is a general axial direction, that is, the first step surface 212 can coincide with or be parallel to the central axis of the pin 2, and not only includes the coincident case. In other embodiments, the first step surface 212 and the second step surface 34 can not be arranged, for example, a limiting block can be arranged in the pin hole 11 to limit the rotation of the spacer 3 within a small range.

[0063] As shown, Figures 4a-7 In the embodiment, the pin 2 comprises a first end surface 213, the first end surface 213 is arranged along the radial direction of the pin 2, the spacer 3 comprises a second end surface 36 matched with the first end surface 213, and the first end surface 213 and the second end surface 36 comprise a second gap 42. The first end surface 213 is used to limit the displacement of the spacer 3 along the axial direction of the pin 2 towards the first end surface. By arranging the first end surface 213 along the radial direction of the pin 2 on the pin 2, the cooperation between the first end surface 213 and the second end surface 36 limits the large-scale movement of the spacer 3 relative to the pin 2 along the axial direction of the pin 2, prevents the spacer from falling out, and the second gap 42 between the first end surface 213 and the second end surface 36 can prevent interference and limiting when the pin 2 rotates relative to the spacer 3. Since the fit between the first fit surface 211 and the second fit surface 31 also has a limiting effect on the displacement of the spacer 3 along the axial direction of the pin 2, in other embodiments, the first end surface 213 and the second end surface 36 can not be arranged.

[0064] As shown, Figure 7 The spacer 3 comprises a notch 33 at the top end and the bottom end, the notch 33 is located on one side of the second fit surface 31, and the notch 33 is arranged to form a first gap 41 between the pin 2 and the spacer 3 after assembly, which can further allow the pin 2 to rotate relative to the spacer 3 within a small range, and prevent interference and limiting when the pin 2 rotates relative to the spacer 3. Specifically, in the embodiment, the notch 33 is a chamfer feature of the second fit surface 31, which is used to form a gap with the pin 2 in the installed state. In other embodiments, the notch 33 can be arranged at the top end or the bottom end of the spacer 3 separately.

[0065] As shown, Figure 4a , Figure 4b and Figure 4cAs shown in the figure, in the present embodiment, the side surface of the pin 2 comprises a recessed portion recessed inwardly, the first step surface 212 and the first end surface 213 are both located at the connection between the recessed portion and the non-recessed portion of the side surface, the recessed portion being the portion of the non-cylindrical section 21 recessed inwardly, the connection between the recessed portion and the non-recessed portion forms a drop, and the first step surface 212 and the first end surface 213 are arranged at the connection, so that the contact fit between the first step surface 212 and the second step surface 34 and between the first end surface 213 and the second end surface 36 is tighter. In other embodiments, the first step surface 212 can be arranged at the connection between the recessed portion and the non-recessed portion of the side surface alone or the first end surface 213 can be arranged at the connection between the recessed portion and the non-recessed portion of the side surface alone.

[0066] As shown in the figure, Figure 4a , Figure 4b and Figure 4c , in the present embodiment, the first abutting surface 211 is located at the position of the recessed portion, the first abutting surface 211 is arranged at the position of the recessed portion, and in the mounted state, the first abutting surface 211 abuts more tightly with the second abutting surface 31, and the structure is more compact.

[0067] As shown in the figure, Figure 4a , Figure 4b and Figure 4c , in the present embodiment, the first abutting surface 211 protrudes outwardly along the radial direction of the pin 2, and compared with arranging the first abutting surface 211 to be recessed inwardly, the strength of the pin 2 is higher. Of course, in other embodiments, the first abutting surface 211 can also be arranged to be recessed inwardly.

[0068] As shown in the figure, Figure 5a , Figure 5b and Figure 5c , in the present embodiment, the spacer 3 is in the form of an open ring, and arranging the spacer 3 in the form of an open ring facilitates the installation of the pin 2 from the open portion of the spacer 3 to the spacer 3, thereby improving the installation efficiency.

[0069] As shown in the figure, Figure 5a , Figure 5b and Figure 5c , in the present embodiment, the top end of the spacer 3 is provided with a boss 35, the boss 35 protrudes from the spacer 3 on the side opposite to the second abutting surface 31, the boss 35 can form a limiting contact with the material around the pin hole 11, and the spacer 3 is prevented from being displaced unidirectionally relative to the pin hole 11 in the axial direction of the pin hole 11.

[0070] As shown in the figure, Figure 3 and Figure 7As shown, the present embodiment also discloses a connecting assembly, which comprises the pin 2 assembly described above, and the connecting assembly further comprises a pin hole 11, which is circular, and in other embodiments, the pin hole 11 can also be rectangular or the like, for being inserted by the pin 2 for limiting installation.

[0071] In the present embodiment, there is a third gap (not shown in the figure) between the spacer 3 and the pin hole 11, and the spacer 3 comprises an outer ring cylindrical surface 32 for being installed in contact with the inner ring surface of the pin hole 11, that is, the radius size of the outer ring cylindrical surface 32 of the spacer 3 is smaller than the radius size of the inner ring surface of the pin hole 11, and since there is a problem of thermal deformation mismatch between the CMC hot end component 1 and the metal component 4 in a high temperature environment, the third gap between the spacer 3 and the pin hole 11 can prevent the thermal mismatch stress from being too high due to the thermal deformation mismatch problem.

[0072] In the present embodiment, as shown in Figure 6a and Figure 6b , the first abutting surface 211 of the pin 2 occupies a circumferential area of half of the corresponding position of the side surface of the pin 2, and in other embodiments, the first abutting surface 211 can occupy more than half of the corresponding position of the side surface of the pin 2, and the larger the area of the first abutting surface 211, the larger the area of the second abutting surface 31, that is, after assembly, the spacer 3 covers at least half of the area of the pin hole 11 along the circumference of the pin hole 11, and the larger the area of the spacer 3 covers along the circumference of the pin hole 11, the larger the area of the abutting surface of the first abutting surface 211 and the second abutting surface 31, so that the contact stress is more dispersed.

[0073] As shown in Figure 7 , the height of the spacer 3 is larger than the depth of the pin hole 11, which can further increase the area of the abutting surface of the first abutting surface 211 and the second abutting surface 31 along the axial direction of the pin hole 11, so that the contact stress is more dispersed.

[0074] In the installed state, the pin 2 and the spacer 3 are tightly abutted by the first abutting surface 211 and the second abutting surface 31, and the spacer 3 has a limiting effect along the axial and radial directions of the pin 2, and the end of the pin 2 connected with the metal component is fixed, so the pin 2 is fixedly installed, and the freedom degree of the spacer 3 along the circumferential direction of the pin 2 is also limited by the limiting effect between the first end surface 213 and the second end surface 36 and the first step surface 212 and the second step surface 34, so that the spacer 3 and the pin 2 can maintain a correct relative position state in the installed state, and if the limiting effect of the first abutting surface 211 and the second abutting surface 31 along the axial direction of the pin 2 fails, the first end surface 213 and the boss 35 supplement the axial limiting effect, so as to prevent the spacer 3 from being separated from the pin hole 11 and causing additional danger.

[0075] AsFigure 8 As shown in the figure, the profile of the mounting structure when the pin 2 rotates relative to the pin hole 11 is given as an example in the direction of the arrow in the figure, that is, counterclockwise rotation. During rotation, the fit state of the pad 3 and the pin hole 11 remains unchanged, the pin 2 and the pad 3 slide relative to each other between the first fit surface 211 and the second fit surface 31, while maintaining the contact fit state. Referring to the pin initial state profile line 5 in the figure, the same applies if counterclockwise rotation occurs, thus avoiding the problem of excessive local contact stress inside the pin hole mounting structure and the problem of easy structural strength failure and reduced service life.

[0076] Although the specific embodiments of the present application are described above, those skilled in the art should understand that this is only an example, and the protection scope of the present application is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present application, and such changes and modifications fall within the protection scope of the present application.

Claims

1. A pin assembly, characterized by The pin assembly comprises a pin body and a spacer, the pin body comprises a first mating surface, the first mating surface is located on the side surface of the pin body, the spacer comprises a second mating surface matched with the first mating surface, the first mating surface and the second mating surface are spherical surfaces or ellipsoidal surfaces, and the outer surfaces of the pin body and the spacer jointly form a mounting surface of the pin assembly. When the pin body and the spacer are both installed into a pin hole, the first mating surface is matched with the second mating surface, and the jointly formed mounting surface of the pin body and the spacer has an active gap with the pin hole. When the pin body rotates relative to the pin hole under load, the mounting surface of the spacer is matched with the pin hole, the pin body rotates relative to the spacer, and the first mating surface slides relative to the second mating surface.

2. The pin assembly of claim 1, wherein, The pin body comprises a first step surface, the first step surface is arranged along the axial direction of the pin body, the spacer comprises a second step surface matched with the first step surface, and the first step surface is used to limit the rotation of the spacer around the axis of the pin.

3. The pin assembly of claim 1, wherein, The pin body comprises a first end surface, the first end surface is arranged along the radial direction of the pin body, the spacer comprises a second end surface matched with the first end surface, a gap is arranged between the first end surface and the second end surface, and the first end surface is used to limit the displacement of the spacer along the axial direction of the pin body towards the first end surface.

4. The pin assembly of claim 1, wherein, The spacer comprises a notch at the top end and / or the bottom end, and the notch is located on one side of the second mating surface.

5. The pin assembly of claim 1, wherein, The top end of the spacer is provided with a boss, and the boss protrudes from the spacer on the side opposite to the second mating surface.

6. The pin assembly of claim 2, wherein, The side surface of the pin body comprises a concave portion, and the first step surface is located at the connection between the concave portion and the non-concave portion of the side surface.

7. The pin assembly of claim 3, wherein The side surface of the pin body comprises a concave portion, and the first end surface is located at the connection between the concave portion and the non-concave portion of the side surface.

8. A pin assembly as claimed in either of claims 6 or 7, wherein, The first mating surface is located at the position of the concave portion.

9. The pin assembly of any of claims 1-7, wherein, The first mating surface protrudes outward along the radial direction of the pin body.

10. The pin assembly of any one of claims 1-7, wherein, The spacer is an unsealed ring.

11. A connection assembly comprising a pin assembly as claimed in any one of claims 1-10, characterized in that The connecting assembly further comprises a pin hole.

12. The connection assembly of claim 11, wherein, There is a gap between the spacer and the pin hole.

13. The connection assembly of claim 11, wherein, The spacer covers at least half of the area of the pin hole along the circumferential direction of the pin hole.

14. The connection assembly of claim 11, wherein, The height of the spacer is greater than the depth of the pin hole.

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