EP2108914B1 - Wire-guided torpedo propulsion assembly - Google Patents

Wire-guided torpedo propulsion assembly Download PDF

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Publication number
EP2108914B1
EP2108914B1 EP08425232.9A EP08425232A EP2108914B1 EP 2108914 B1 EP2108914 B1 EP 2108914B1 EP 08425232 A EP08425232 A EP 08425232A EP 2108914 B1 EP2108914 B1 EP 2108914B1
Authority
EP
European Patent Office
Prior art keywords
assembly
parts
torpedo
axially
edge
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Revoked
Application number
EP08425232.9A
Other languages
German (de)
French (fr)
Other versions
EP2108914A1 (en
Inventor
Giancarlo Bottaini
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Leonardo SpA
Original Assignee
Leonardo SpA
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Filing date
Publication date
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=39808548&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP2108914(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Leonardo SpA filed Critical Leonardo SpA
Priority to EP08425232.9A priority Critical patent/EP2108914B1/en
Publication of EP2108914A1 publication Critical patent/EP2108914A1/en
Application granted granted Critical
Publication of EP2108914B1 publication Critical patent/EP2108914B1/en
Revoked legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41G—WEAPON SIGHTS; AIMING
    • F41G7/00—Direction control systems for self-propelled missiles
    • F41G7/20—Direction control systems for self-propelled missiles based on continuous observation of target position
    • F41G7/30—Command link guidance systems
    • F41G7/32—Command link guidance systems for wire-guided missiles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B15/00—Self-propelled projectiles or missiles, e.g. rockets; Guided missiles
    • F42B15/01—Arrangements thereon for guidance or control
    • F42B15/04—Arrangements thereon for guidance or control using wire, e.g. for guiding ground-to-ground rockets
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B19/00—Marine torpedoes, e.g. launched by surface vessels or submarines; Sea mines having self-propulsion means
    • F42B19/01—Steering control

Definitions

  • the present invention relates to a wire-guided torpedo propulsion assembly.
  • a torpedo propulsion assembly normally comprises two counter-rotating propellers with respective hubs driven by coaxial shafts.
  • the axially adjacent hubs are mounted between two axial covers - one front and one rear; and, to prevent water from entering between the parts in relative motion, sliding face seals are provided, normally comprising a graphite ring sliding on a tungsten carbide surface.
  • Wire-guidance systems comprising an optical-fibre cable wound partly on a reel inside the torpedo, and partly on a reel integral with the launcher.
  • the cable extends along a cable duct extending inside the innermost (rear) propeller shaft, to allow dialoging between the launcher and the torpedo. This system enables distancing of the torpedo and the launcher with no significant increase in load on the cable, which is therefore maintained below break load at all times.
  • the wire-guidance cable is unwound gradually as the torpedo advances.
  • the wire-guidance cable is normally of slightly negative buoyancy (hydrostatic thrust - weight) and so tends to either remain stationary or sink very slowly.
  • the rotating propellers may engage the cable and wind it onto the face seals; in which case, the cable may interpose itself between the graphite ring and the sealing surface, thus allowing water into the torpedo.
  • US-A- 5637825 discloses a propulsion assembly for a torpedo equipped with a wire-guidance cable, the assembly comprising at least two parts in relative rotational motion and protection means to guide the cable and avoid any interaction of the latter with the torpedo propeller.
  • the protection means are constituted by a tubular protective shroud enclosing the propeller.
  • Number 1 in Figure 1 indicates as a whole a propulsion assembly of a wire-guided torpedo 2 (only shown partly).
  • Assembly 1 comprises two propellers 3, 4 mounted on respective front and rear hubs 5, 6 fitted to respective coaxial, counter-rotating shafts 7, 8.
  • Shafts 7, 8 are driven by an electric motor (not shown) by means of a known drive, also not shown by not forming part of the present invention.
  • Shafts 7, 8 are hollow, and are fitted one inside the other by means of conventional radial bearings 9 and thrust bearings 10 not described in detail.
  • Front hub 5 is fitted to the outer shaft 7, and rear hub 6 is fitted to an end portion 11 of the inner shaft 8 projecting axially from shaft 7.
  • Inner shaft 8 houses a cable duct 12, along which unwinds a wire-guidance cable 14 wound into a reel (not shown) housed in the body of torpedo 2.
  • Hubs 5, 6 are axially adjacent and mounted between an annular front cover 15 fixed rigidly to the body of torpedo 2, and an annular rear cover 16 fixed to one end of cable duct 12. The two covers 15, 16 thus close propulsion assembly 1 axially.
  • An axial clearance defining a gap 17 is present between each two parts in relative motion (front cover 15 - front hub 5; front hub 5 - rear hub 6; rear hub 6 - rear cover 16). And, to prevent water entering the torpedo through gap 17, a known sliding face seal assembly 18 is provided between the parts in each pair.
  • each seal assembly 18 comprises an annular seal 19 made of material with a low friction coefficient, e.g. graphite, and secured in known manner to one of the parts in the pair by an elastic device 20; and a ring 21 made of extremely hard, wear-resistant material, e.g. tungsten carbide, and fitted to the other of the parts in relative motion.
  • Elastic device 20 not described in detail as not forming part of the present invention - exerts axial thrust on seal 19 to hold it in contact with ring 21.
  • protection means 22 defining a labyrinth 23 are provided on the outside of gaps 17.
  • Protection means 22 conveniently comprise a circumferential edge 24, which extends axially from one of the parts in relative motion (the front part, i.e. closer to the torpedo head), and extends flush with the outer profile of the torpedo, in the opposite direction to the travelling direction of the torpedo; and a corresponding inner circumferential projection 25, which extends axially from the other of the parts in relative motion (the rear part, i.e. closer to the rear of the torpedo), extends in the travelling direction of the torpedo, and is coaxial with and radially faces edge 24 to form labyrinth 23 with edge 24.
  • inner projection 25 is preferably defined by a number of, e.g. four, sectors 26 equally spaced angularly to define an axially symmetrical structure.
  • Figure 2 shows front cover 15 with edge 24.
  • Figure 3 shows front hub 5, which, at the front, has sectors 26 cooperating with edge 24 of front cover 15, and has edge 24 at the rear.
  • FIG. 4 shows rear hub 6, which, at the front, has sectors 26 cooperating with edge 24 of front hub 5, and has edge 24 at the rear.
  • Figure 5 shows rear cover 16 with sectors 26 at the front cooperating with edge 24 of rear hub 6.
  • wire-guidance cable 14 would have to change direction three times. That is, to negotiate labyrinth 23, it would have to move radially to penetrate, then continue in an axial direction, and, finally, move once more radially with respect to the axis of torpedo 2, and all this while propellers 3, 4 are rotating. The likelihood of this occurring is substantially zero.
  • sectors 26 act as a reel about which cable 14 can wind without compromising the seals.
  • projection 25 comprises a number of separate sectors 26, as opposed to being continuous, allows fresh water, when washing, to reach the seals, and does not affect the cooling and lubrication condition of the seals.
  • protection means 22 Being axially symmetrical, protection means 22 induce no static or dynamic unbalance of the rotating parts, and produce no noise during rotation. Edges 24, flush with the outer profile of torpedo 2, also assist in maintaining a low noise level.
  • propulsion assembly 1 as described herein without, however, departing from the protective scope as defined in the accompanying Claims.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)

Description

  • The present invention relates to a wire-guided torpedo propulsion assembly.
  • A torpedo propulsion assembly normally comprises two counter-rotating propellers with respective hubs driven by coaxial shafts. The axially adjacent hubs are mounted between two axial covers - one front and one rear; and, to prevent water from entering between the parts in relative motion, sliding face seals are provided, normally comprising a graphite ring sliding on a tungsten carbide surface.
  • Wire-guidance systems are also known comprising an optical-fibre cable wound partly on a reel inside the torpedo, and partly on a reel integral with the launcher. The cable extends along a cable duct extending inside the innermost (rear) propeller shaft, to allow dialoging between the launcher and the torpedo. This system enables distancing of the torpedo and the launcher with no significant increase in load on the cable, which is therefore maintained below break load at all times.
  • The wire-guidance cable is unwound gradually as the torpedo advances. The wire-guidance cable is normally of slightly negative buoyancy (hydrostatic thrust - weight) and so tends to either remain stationary or sink very slowly.
  • In the event of the torpedo trajectory passing close to the unwinding cable, the rotating propellers may engage the cable and wind it onto the face seals; in which case, the cable may interpose itself between the graphite ring and the sealing surface, thus allowing water into the torpedo.
  • US-A- 5637825 discloses a propulsion assembly for a torpedo equipped with a wire-guidance cable, the assembly comprising at least two parts in relative rotational motion and protection means to guide the cable and avoid any interaction of the latter with the torpedo propeller. In particular, the protection means are constituted by a tubular protective shroud enclosing the propeller.
  • It is an object of the present invention to provide a wire-guided torpedo propulsion assembly designed to eliminate the above drawback.
  • According to the present invention, there is provided a wire-guided torpedo as claimed in Claim 1.
  • A preferred, non-limiting embodiment of the present invention will be described by way of example with reference to the accompanying drawings, in which:
    • Figure 1 shows an axial section of a propulsion assembly in accordance with the invention;
    • Figures 2, 3, 4 and 5 show views in perspective of component parts of the Figure 1 assembly.
  • Number 1 in Figure 1 indicates as a whole a propulsion assembly of a wire-guided torpedo 2 (only shown partly).
  • Assembly 1 comprises two propellers 3, 4 mounted on respective front and rear hubs 5, 6 fitted to respective coaxial, counter-rotating shafts 7, 8.
  • Shafts 7, 8 are driven by an electric motor (not shown) by means of a known drive, also not shown by not forming part of the present invention.
  • Shafts 7, 8 are hollow, and are fitted one inside the other by means of conventional radial bearings 9 and thrust bearings 10 not described in detail.
  • Front hub 5 is fitted to the outer shaft 7, and rear hub 6 is fitted to an end portion 11 of the inner shaft 8 projecting axially from shaft 7.
  • Inner shaft 8 houses a cable duct 12, along which unwinds a wire-guidance cable 14 wound into a reel (not shown) housed in the body of torpedo 2.
  • Hubs 5, 6 are axially adjacent and mounted between an annular front cover 15 fixed rigidly to the body of torpedo 2, and an annular rear cover 16 fixed to one end of cable duct 12. The two covers 15, 16 thus close propulsion assembly 1 axially.
  • An axial clearance defining a gap 17 is present between each two parts in relative motion (front cover 15 - front hub 5; front hub 5 - rear hub 6; rear hub 6 - rear cover 16). And, to prevent water entering the torpedo through gap 17, a known sliding face seal assembly 18 is provided between the parts in each pair.
  • More specifically, each seal assembly 18 comprises an annular seal 19 made of material with a low friction coefficient, e.g. graphite, and secured in known manner to one of the parts in the pair by an elastic device 20; and a ring 21 made of extremely hard, wear-resistant material, e.g. tungsten carbide, and fitted to the other of the parts in relative motion. Elastic device 20 - not described in detail as not forming part of the present invention - exerts axial thrust on seal 19 to hold it in contact with ring 21.
  • According to the present invention, to prevent wire-guidance cable 14 from penetrating gap 17 and interposing itself between seal 19 and ring 21, thus separating them and impairing sealing performance, protection means 22 defining a labyrinth 23 are provided on the outside of gaps 17.
  • Protection means 22 conveniently comprise a circumferential edge 24, which extends axially from one of the parts in relative motion (the front part, i.e. closer to the torpedo head), and extends flush with the outer profile of the torpedo, in the opposite direction to the travelling direction of the torpedo; and a corresponding inner circumferential projection 25, which extends axially from the other of the parts in relative motion (the rear part, i.e. closer to the rear of the torpedo), extends in the travelling direction of the torpedo, and is coaxial with and radially faces edge 24 to form labyrinth 23 with edge 24.
  • As opposed to being circumferentially continuous, inner projection 25 is preferably defined by a number of, e.g. four, sectors 26 equally spaced angularly to define an axially symmetrical structure.
  • Figure 2 shows front cover 15 with edge 24.
  • Figure 3 shows front hub 5, which, at the front, has sectors 26 cooperating with edge 24 of front cover 15, and has edge 24 at the rear.
  • Figure 4 shows rear hub 6, which, at the front, has sectors 26 cooperating with edge 24 of front hub 5, and has edge 24 at the rear.
  • Figure 5 shows rear cover 16 with sectors 26 at the front cooperating with edge 24 of rear hub 6.
  • Sectors 26 prevent passage of cable 14.
  • To reach sealing assembly 18, wire-guidance cable 14 would have to change direction three times. That is, to negotiate labyrinth 23, it would have to move radially to penetrate, then continue in an axial direction, and, finally, move once more radially with respect to the axis of torpedo 2, and all this while propellers 3, 4 are rotating. The likelihood of this occurring is substantially zero.
  • Assuming the cable manages to slip inside the first portion of the path of labyrinth 23, sectors 26 act as a reel about which cable 14 can wind without compromising the seals.
  • The fact that projection 25 comprises a number of separate sectors 26, as opposed to being continuous, allows fresh water, when washing, to reach the seals, and does not affect the cooling and lubrication condition of the seals.
  • Being axially symmetrical, protection means 22 induce no static or dynamic unbalance of the rotating parts, and produce no noise during rotation. Edges 24, flush with the outer profile of torpedo 2, also assist in maintaining a low noise level.
  • Clearly, changes may be made to propulsion assembly 1 as described herein without, however, departing from the protective scope as defined in the accompanying Claims.

Claims (9)

  1. A propulsion assembly (1) for a torpedo (2) equipped with a wire-guidance cable (14), the assembly comprising at least two parts (15, 5; 5, 6; 6, 16) in relative rotational motion; face sealing means (18) interposed between said parts (15, 5; 5, 6; 6, 16); and protection means (22) for preventing access of said cable (14) to said face sealing means (18),
    said protection means (22) defining a labyrinth (23).
  2. An assembly as claimed in Claim 1, characterised in that said protection means (22) comprise a circumferential edge (24) extending in a substantially axial direction from one of said at least two parts (15; 5; 6); and at least one circumferential projection (25) extending axially from the other part (5; 6; 16) and radially facing said edge (24).
  3. An assembly as claimed in Claim 2, characterised in that said edge (24) is flush with an outer profile of said propulsion assembly (1) and faces the opposite way to the travelling direction of the torpedo (2).
  4. An assembly as claimed in Claim 3, characterized in that the projection (25) is located radially inwards with respect to said edge (24), and extends axially in the travelling direction of the torpedo (2).
  5. An assembly as claimed in one of Claims 2 to 4, characterized in that said projection (25) is defined by a number of angularly spaced sectors (26).
  6. An assembly as claimed in Claim 5, characterised in that said sectors (26) are arranged axially symmetrically.
  7. An assembly as claimed in any one of the foregoing Claims, characterized in that at least one of said parts (5; 6) is a hub of a propeller (3; 4).
  8. An assembly as claimed in Claim 7, characterised in that at least one of said parts is an axial cover (15; 16) of said propulsion assembly (1).
  9. An assembly as claimed in Claim 8, characterized in that said parts in relative rotational motion comprise two axially adjacent, counter-rotating hubs (5, 6), and two fixed covers (15, 16) located on axially opposite sides of said hubs (5, 6); said protection means (22) being provided between each two axially adjacent said parts (15, 5; 5, 6; 6, 16) in relative rotational motion.
EP08425232.9A 2008-04-08 2008-04-08 Wire-guided torpedo propulsion assembly Revoked EP2108914B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08425232.9A EP2108914B1 (en) 2008-04-08 2008-04-08 Wire-guided torpedo propulsion assembly

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08425232.9A EP2108914B1 (en) 2008-04-08 2008-04-08 Wire-guided torpedo propulsion assembly

Publications (2)

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EP2108914A1 EP2108914A1 (en) 2009-10-14
EP2108914B1 true EP2108914B1 (en) 2018-05-30

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ID=39808548

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EP08425232.9A Revoked EP2108914B1 (en) 2008-04-08 2008-04-08 Wire-guided torpedo propulsion assembly

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Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB338539A (en) 1928-07-27 1930-11-17 Lesto Ab Improvements in or relating to torpedoes
DE1125814B (en) 1959-01-28 1962-03-15 Boelkow Entwicklungen Kg Protection device for sensitive parts on rocket propelled missiles
US3151528A (en) 1960-12-02 1964-10-06 Clevite Corp Swashplate engine
US3613618A (en) 1965-12-02 1971-10-19 Licentia Gmbh Protective sheath for torpedo control wire
US3667319A (en) 1970-07-20 1972-06-06 Gen Motors Corp Roller traction drive mechanism
US3706293A (en) * 1968-07-17 1972-12-19 Us Navy Steerable self-propelled submersible
EP0507430A2 (en) 1991-01-28 1992-10-07 Hughes Aircraft Company Combination optical fiber and electrical connector
US5158030A (en) 1992-03-22 1992-10-27 The United States Of America As Represented By The Secretary Of The Navy Damped flexible seal
US5448962A (en) 1994-06-30 1995-09-12 The United States Of America As Represented By The Secretary Of The Navy Torpedo tube slide valve
US5558498A (en) 1994-05-31 1996-09-24 Sanshin Kogyo Kabushiki Kaisha Propeller shaft assembly for marine propulsion system
US5637825A (en) 1996-01-17 1997-06-10 The United States Of America As Represented By The Secretary Of The Navy Control line spool
US5678785A (en) 1994-12-16 1997-10-21 Sci Industries, Inc. Fiber-optic cable dispenser and remotely controlled vehicle using same

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3818840C1 (en) * 1988-06-03 1994-01-20 Deutsche Aerospace Stress reduction device for optical waveguide for aerial remote control of missile - guides waveguide to missile for signal transmission until detonation using tension-relieving winding in ejection tube
US5419512A (en) * 1990-09-06 1995-05-30 The United States Of America As Represented By The Secretary Of The Navy Towed fiber optic data link payout system
FR2674015B1 (en) * 1991-03-14 1995-01-20 France Etat Armement METHOD AND DEVICE FOR DEPLOYING A FILOTRANSMISSION CABLE OF AN UNDERWATER MACHINE FROM A LAUNCHING PLATFORM.

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB338539A (en) 1928-07-27 1930-11-17 Lesto Ab Improvements in or relating to torpedoes
DE1125814B (en) 1959-01-28 1962-03-15 Boelkow Entwicklungen Kg Protection device for sensitive parts on rocket propelled missiles
US3151528A (en) 1960-12-02 1964-10-06 Clevite Corp Swashplate engine
US3613618A (en) 1965-12-02 1971-10-19 Licentia Gmbh Protective sheath for torpedo control wire
US3706293A (en) * 1968-07-17 1972-12-19 Us Navy Steerable self-propelled submersible
US3667319A (en) 1970-07-20 1972-06-06 Gen Motors Corp Roller traction drive mechanism
EP0507430A2 (en) 1991-01-28 1992-10-07 Hughes Aircraft Company Combination optical fiber and electrical connector
US5158030A (en) 1992-03-22 1992-10-27 The United States Of America As Represented By The Secretary Of The Navy Damped flexible seal
US5558498A (en) 1994-05-31 1996-09-24 Sanshin Kogyo Kabushiki Kaisha Propeller shaft assembly for marine propulsion system
US5448962A (en) 1994-06-30 1995-09-12 The United States Of America As Represented By The Secretary Of The Navy Torpedo tube slide valve
US5678785A (en) 1994-12-16 1997-10-21 Sci Industries, Inc. Fiber-optic cable dispenser and remotely controlled vehicle using same
US5637825A (en) 1996-01-17 1997-06-10 The United States Of America As Represented By The Secretary Of The Navy Control line spool

Non-Patent Citations (11)

* Cited by examiner, † Cited by third party
Title
"Bundesgesetzblatt", 6 January 1988, article ANONYMOUS: "Gesetz über die Sicherung und Nutzung von Archivgut des Bundes (Bundesarchivgesetz - BArchG)", pages: 62 - 64, XP055742742
"Gleitringdichtung", WIKIPEDIA, 15 December 2007 (2007-12-15), XP055568123, Retrieved from the Internet <URL:https://de.wikipedia.org/w/index.php?title=Gleitringdichtung&oldid=40104055>
"Gleitringdichtung", WIKIPEDIA, 30 October 2018 (2018-10-30), XP055568130, Retrieved from the Internet <URL:https://de.wikipedia.org/w/index.php?title=Gleitringdichtung&oldid=182277601>
ANONYMOUS: "6.7 Änderung des Geheimhaltungsgrades, Rückgabe und Vernichtung", HANDBUCH FÜR DIE GEHEIMSCHUTZ IN DER WIRTSCHAFT GEHEIMSCHUTZHANDBUCH, 1 January 2004 (2004-01-01), pages 59 - 60, XP055742886, [retrieved on 20201022]
ANONYMOUS: "Akte BV 5/68469", BUNDESARCHIV, 1 January 1965 (1965-01-01), pages 1 - 5, XP055742904
ANONYMOUS: "Akte BV 5/69576", BUNDESARCHIV AKTE BV 5/69576, 1 January 1973 (1973-01-01), pages 1 - 11, XP055742907
ANONYMOUS: "Akte BV 5/9916", BUNDESARCHIV, 1 January 1970 (1970-01-01), pages 1 - 4, XP055742910
ANONYMOUS: "Archivsignatur BW 1/387667", BIUNDESARCHIV ARCHIVSIGNATUR BW 1/387667, 1 January 1967 (1967-01-01), pages 1 - 15, XP055742899
ANONYMOUS: "Einträge aus der Allgemeinen und der Navigierenden Suche", BUNDESARCHIV, 2 October 2019 (2019-10-02), pages 1,23 - 24,47-49, XP055742891
ANONYMOUS: "Gesetz über die Nutzung und Sicherung von Archivgut des Bundes", BUNDESARCHIVGESETZ – BARCHG, 10 March 2017 (2017-03-10), pages 1 - 11, XP055742882, Retrieved from the Internet <URL:https://www.bundesarchiv.de/DE/Content/Downloads/Rechtliches/bundesarchivgesetz.pdf?__blob=publicationFile> [retrieved on 20201022]
ANONYMOUS: "Metal Face Seals - Installation and Maintenance", ERIKS INDUSTRIAL SERVICES, 16 November 2020 (2020-11-16), XP055754863, Retrieved from the Internet <URL:http://sealshop.eriks.co.uk/t/productmetalfacesealsinstallation>

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