Joining device for joining two assemblies, for example for a stator of a turbomachine
View Patent ↗A joining device including a clevis and a connecting member is disclosed. The connecting member includes a through hole which is housed between a first and a second lug of the clevis. These lugs respectively have a first clevis hole and a second clevis hole. The device further includes a shear pin system passing through each of the holes and includes a threaded end collaborating with a nut system which abuts against the second lug. The shear pin system includes a widened portion passing through the first hole and forming a shoulder situated between the two lugs. The member is situated away from the first lug. A first side of the member is pressed against the shoulder and a second side of the member is pressed against the second lug.
1. A joint in a turbomachine, comprising:
a first assembly which includes an inner wall member, an axis of said first assembly is the same as an axis of said turbomachine;
a second assembly which includes an outer wall member, an axis of said second assembly is the same as said axis of said turbomachine;
an annular space defined between said first assembly and said second assembly;
a clevis which is attached to said inner wall member of the first assembly, said clevis including a first lug with a first clevis hole and a second lug with a second clevis hole, said first lug includes a first side and a second side, opposite said first side, and said first clevis hole is substantially perpendicular to said first side and said second side of said first lug, said second lug includes a first side and a second side, opposite said first side, and said second clevis hole is substantially perpendicular to said first side and said second side of said second lug;
a connecting member which is fixedly attached to said outer wall member of the second assembly at a first end of said connecting member, said connecting member including a through hole disposed between said first lug and said second lug of said clevis at a second end of the connecting member, opposite said first end of said connecting member; and
a shear pin which passes through each of said first clevis hole, second clevis hole and through hole,
wherein said shear pin includes a first threaded end at a first end of the shear pin which threadably engages a nut, said nut abuts against said first side of said second clevis lug,
wherein said shear pin includes, at a second end opposite the first threaded end, a bushing with a widened portion which passes through said first clevis hole and is fixed within said first clevis hole, said widened portion forms a shoulder disposed between said first and second clevis lugs,
wherein said connecting member is disposed away from said first clevis lug along said shear pin,
wherein a first side of said connecting member abuts against said shoulder and a second side of said connecting member, opposite said first side of said connecting member, abuts said second side of said second clevis lug,
wherein said first side and said second side of said first clevis lug, said first side and said second side of said second clevis lug and said first side and said second side of said connecting member are substantially parallel to a clevis axis, and
wherein said clevis axis is offset at an acute angle from said axis of said turbomachine.
2. The joint as claimed in claim 1 , wherein a thickness e of said connecting member in an axial direction of the shear pin satisfies the condition 1.3<E/e<2.5 where E corresponds to a separation between said first and second clevis lugs in the axial direction.
3. The joint device as claimed in claim 1 , wherein said shear pin comprises a head and said bushing abuts said head at a first end of said bushing and forms said shoulder at a second end of said bushing opposite the first end of said bushing.
4. The joint as claimed in claim 3 , wherein a diameter of said head is greater than an outer diameter of said bushing.
5. The joint as claimed in claim 1 , wherein a diameter of said first clevis hole is larger than a diameter said second clevis hole.
6. The joint as claimed in claim 1 , wherein said connecting member is an arm.
7. The joint as claimed in claim 1 , wherein said annular space forms a portion of a primary duct for gases of said turbomachine.
8. The joint as claimed in claim 1 , wherein the joint constitutes a portion of a stator of said turbomachine.
9. A turbomachine module which comprises at least one joint as claimed in claim 1 wherein the turbomachine module is a turbine or a compressor of a turbomachine.
10. The joint as claimed in claim 1 , wherein the connecting member is fixedly attached to the second assembly by screwed fittings.
11. A joint in a turbomachine, comprising:
a first assembly which includes an inner wall member, an axis of said first assembly is the same as an axis of said turbomachine;
a second assembly which includes an outer wall member, an axis of said second assembly is the same as said axis of said turbomachine;
an annular space defined between said first assembly and said second assembly;
a clevis which is attached to said inner wall member of the first assembly, said clevis including a first lug with a first clevis hole and a second lug with a second clevis hole, said first lug includes a first side and a second side, opposite said first side, and said first clevis hole is substantially perpendicular to said first side and said second side of said first lug, said second lug includes a first side and a second side, opposite said first side, and said second clevis hole is substantially perpendicular to said first side and said second side of said second lug;
a connecting member which is fixedly attached to said outer wall member of the second assembly at a first end of said connecting member, said connecting member including a through hole disposed between said first lug and said second lug of said clevis at a second end of the connecting member, opposite said first end of said connecting member; and
a shear pin which passes through each of said first clevis hole, second clevis hole and through hole,
wherein said shear pin includes a first threaded end at a first end of the shear pin which threadably engages a nut, said nut abuts against said first side of said second clevis lug,
wherein said shear pin includes, at a second end opposite the first threaded end, a screw head with a widened portion which passes through said first clevis hole and is fixed within said first clevis hole, said widened portion forms a shoulder disposed between said first and second clevis lugs,
wherein said connecting member is disposed away from said first clevis lug along said shear pin,
wherein a first side of said connecting member abuts against said shoulder and a second side of said connecting member, opposite said first side of said connecting member, abuts said second side of said second clevis lug,
wherein said first side and said second side of said first clevis lug, said first side and said second side of said second clevis lug and said first side and said second side of said connecting member are substantially parallel to a clevis axis, and
wherein said clevis axis is offset at an acute angle from said axis of said turbomachine.