1. At least one barrier structure located in an airflow passageway between a ceiling mounting fire sprinkler and an upper surface of a computer rack in a datacenter, said at least one air barrier structure comprising:
a spring-biased roller attachable to said ceiling;
a shade member constituted of a flexible air-impervious material having an upper end fastened to said roller, said roller normally imparting a biasing force for winding said shade member upward about said roller;
a rod member attached to a bottom edge of said shade member;
a hold-down structure fastenable to the upper surface of said computer rack, said hold-down structure including a further rod member;
water-soluble elements interconnecting said rod member at the bottom edge of said shade member with said further rod member of the hold-down structure for retaining said shade member in a downwardly extended airflow blocking condition in said passageway; and
channeling structure connected to said shade member in close proximity with said water-soluble elements, whereby upon activation of a fire sprinkler responsive to a conflagration, water emanating therefrom is channeled to said water-soluble elements to dissolve the latter so as to release the interconnection between said barrier structure and the hold-down structure and facilitating the upward retraction of said shade member.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A torsional vibration damping arrangement for a drivetrain of a vehicle, comprising:
an input region (12) configured to be driven in rotation around an axis of rotation (A);
an outsut region (14);
a first torque transmission path (20);
a second torque transmission path (22) arranged parallel to the first torque transmission path (20) the first and second torques transmissions paths (20; 22) being arranged between the input region (12) and the output region (14);
a phase shifter arrangement (26), arranged at least in the other of the first and second torque transmission paths (20), the phase shifter arrangement (26) being configured to generate a phase shift of rotational irregularities transmitted via the other of the first and second torque transmission paths (20) relative to rotational irregularities transmitted via the one of the first and second torque transmission paths (22);
a coupling arrangement (24) configured to destructively superpose torques transmitted via the first and second torque transmission paths (20, 22),
wherein the coupling arrangement (24) comprises a planetary gear arrangement (52) with a planet wheel carrier (54) coupled to one of the first and second torque transmission paths (22) and planet wheels (56), each comprising a gear wheel rotatably supported at the planet wheel carrier (56);
said gearwheel comprising:
a first gearwheel part (86);
a first working toothing region (74) provided at the first gearwheel part (86);
a second gearwheel part (88); and
a second working toothing region (76) provided at the second gearwheel part (88),
wherein:
the two working toothing regions (74, 76) are arranged successively in a direction of a gearwheel rotational axis (Z), and
the first and second gearwheel parts (86, 88) are connected to one another by positive engagement andor bonding engagement andor frictional engagement so as to rotate together around the gearwheel rotational axis (Z) andor against relative movement with respect to one another in the direction of the gearwheel rotational axis (Z).
2. The torsional vibration damping arrangement according to claim 1, wherein the positive engagement is produced by:
at least one connection element (102; 130; 146) in positive engagement with the first gearwheel part (86) andor the second gearwheel part (88), andor
connection toothings (134, 132) provided at the first gearwheel part (86) and at the second gearwheel part (88).
3. The torsional vibration damping arrangement according to claim 2, wherein the at least one connection element (102; 146) is substantially pin-shaped and configured to engage a connection cutout (98; 148) of the first gearwheel part (86) and a connection cutout (100; 150) of the second gearwheel part (88).
4. The torsional vibration damping arrangement according to claim 3, wherein the gearwheel parts (86, 88) are held by the at least one connection element (102; 146) against relative movement in the direction of the gearwheel rotational axis (Z).
5. The torsional vibration damping arrangement according to claim 4, wherein the connection cutout (98) at one of the first and second gearwheel parts (86) extends radially outwardly at an inner circumferential surface (94) as a bulge extending in the direction of the gearwheel rotational axis (Z), and the connection cutout (100) at the other of the first and second gearwheel part (88) extends radially inwardly at an outer circumferential surface (96) as a bulge extending in the direction of the gearwheel rotational axis (Z), wherein the at least one connection element (102) is positioned radially between the inner circumferential surface (94) and the outer circumferential surface (96).
6. The torsional vibration damping arrangement according to claim 5, wherein the at least one connection element (102) is configured to be pressed into the connection cutouts (98, 100) associated with the at least one connection element (102).
7. The torsional vibration damping arrangement according to claim 6, wherein the connection cutouts (148, 150) are formed at the first and second gearwheel parts (86, 88) as through-openings, wherein the at least one connection element (146) is positioned so as to engage in connection cutouts (148, 150) of the first and second gearwheel parts (86, 88), which connection cutouts (148, 150) are positioned so as to be aligned with one another.
8. The torsional vibration damping arrangement according to claim 2, wherein the at least one connection element (146) engages behind at least one of the first and second gearwheel parts (86, 88).
9. The torsional vibration damping arrangement according to claim 2, wherein the at least one connection element (130) is sleeve-shaped and has an outer circumferential connection toothing (132), wherein an inner circumferential connection toothing (134, 136) is provided at at least one of the first and second gearwheel parts (86, 88), for engaging with the outer circumferential connection toothing (132).
10. The torsional vibration damping arrangement according to claim 2, further comprising an outer circumferential connection toothing (132), arranged at one of the first and second gearwheel parts (88), and an inner circumferential connection toothing (134), engaging with the outer circumferential connection toothing (132), arranged at the other of the first and second gearwheel parts (86).
11. The torsional vibration damping arrangement according to claim 10, wherein the outer circumferential connection toothing (132) comprises the working toothing (76) of the one of the first and second gearwheel parts (88).
12. The torsional vibration damping arrangement according to claim 2, further comprising a first axial connection toothing (142), arranged at the one of the first and second gearwheel parts (86), and a second axial connection toothing (144), engaging with the first axial connection toothing (142), arranged at the other of the first and second gearwheel parts (88).
13. The torsional vibration damping arrangement according to claim 1, wherein the bonding engagement is produced by welding andor soldering andor gluing.
14. The torsional vibration damping arrangement according to claim 13, wherein the welding is produced by fusion welding of a type from the group consisting of: preferably laser welding, electron beam welding, induction welding, electric resistance welding and friction welding.
15. The torsional vibration damping arrangement according to claim 14, wherein the gearwheel parts (86, 88) are configured to be connected in a region of radially or axially opposed surfaces (94, 96; 104, 106).
16. The torsional vibration damping arrangement according to claim 15, further comprising a particle collection cutout (114, 116) arranged in the region of the axially or radially opposed surfaces (94, 96; 104, 106) in at least one of the first and second gearwheel parts (86, 88).
17. The torsional vibration damping arrangement according to claim 1, wherein the frictional engagement is produced by interference fit andor shrink fit.
18. The torsional vibration damping arrangement according to claim 17, further comprising a sleeve-shaped connection element (154) having a circumferential surface (156), in frictional engagement with at least one of the first and second gearwheel parts (86, 88).
19. The torsional vibration damping arrangement according to claim 17, wherein one of the first and second gearwheel parts (88) has a circumferential surface (96), in frictional engagement with the other of the first and second gearwheel parts (86).
20. The torsional vibration damping arrangement according to claim 1, further comprising a damper element arrangement (40, 50), wherein the phase shifter arrangement (26) comprises a vibration system (28) with a primary side (30) and a secondary side (44) rotatable with respect to the primary side (30) around the axis of rotation (A) against the action of the damper element arrangement (40, 50).