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US3809334A - Winch system for helicopter - Google Patents

Winch system for helicopter Download PDF

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Publication number
US3809334A
US3809334A US00304287A US30428772A US3809334A US 3809334 A US3809334 A US 3809334A US 00304287 A US00304287 A US 00304287A US 30428772 A US30428772 A US 30428772A US 3809334 A US3809334 A US 3809334A
Authority
US
United States
Prior art keywords
guide sheave
sheave assembly
feedscrew
assembly
cable
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.)
Expired - Lifetime
Application number
US00304287A
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English (en)
Inventor
R Beurer
P Jeffery
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.)
RTX Corp
Original Assignee
United Aircraft Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by United Aircraft Corp filed Critical United Aircraft Corp
Priority to US00304287A priority Critical patent/US3809334A/en
Priority to CA183,669A priority patent/CA982110A/en
Priority to DE19732352700 priority patent/DE2352700A1/de
Priority to GB4933073A priority patent/GB1437385A/en
Priority to JP48123293A priority patent/JPS4980753A/ja
Priority to IT30906/73A priority patent/IT999202B/it
Application granted granted Critical
Publication of US3809334A publication Critical patent/US3809334A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
    • B64D1/00—Dropping, ejecting, releasing or receiving articles, liquids, or the like, in flight
    • B64D1/22—Taking-up articles from earth's surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
    • B66D1/28—Other constructional details
    • B66D1/36—Guiding, or otherwise ensuring winding in an orderly manner, of ropes, cables, or chains
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D2700/00—Capstans, winches or hoists
    • B66D2700/01—Winches, capstans or pivots
    • B66D2700/0183—Details, e.g. winch drums, cooling, bearings, mounting, base structures, cable guiding or attachment of the cable to the drum
    • B66D2700/0191—Cable guiding during winding or paying out
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S242/00—Winding, tensioning, or guiding
    • Y10S242/912—Indicator or alarm

Definitions

  • ABSTRACT A cable winch for helicopter installation which has a guide sheave assembly utilizing a trunnion and carriage assembly for the guide pulley including a reaction bar and rollers to transmit the horizontal component of cable tension into the reaction bar, a reaction strut for supporting the guide sheave assembly and which is pivoted to follow traversing motion of the guide sheave assembly, a levelwind mechanism having a two-speed drive for traversing of the guide sheave assembly and automatic means for changing traversing speed during cable deploy or retrieval, and a load cell in the guide sheave assembly support for measuring cable tension.
  • This invention relates to a winch for use with a helicopter to deploy and retrieve a towed array assembly including a cable consisting of sections of two different diameters, and more particularly to the levelwind feed speed control, guide sheave assembly, and tow cable tension sensing features of the winch.
  • winching devices have been employed with helicopters to raise and lower cargo loads carried by the helicopter, for rescue operations, or to deploy andretrieve towed devices such as those used in submarine surveillance or antimining operations.
  • Different uses and functions of the winching devices do, of course, involve different winching structures and operations and, accordingly, winch structures employ various features depending upon the particular use of the winch as well as the degree of sophistication of the total system.
  • Smaltz US. Pat. No. 2,862,673 discloses a speed drive arrangement for paying out a cable at a different rate than that used to draw in the cable.
  • Hanson U.S. Pat. No. 2,900,145 is directed to a variable speed levelwind mechanism for a winch system which includes control of the traversing speed of the levelwind mechanism in accordance with several factors including cable diameter. However, a speed change is not accomplished during the winding of any one reel or drum.
  • An object of this invention is to provide an improved winching system for use with a helicopter.
  • Another object of the invention is to provide a helicopter winching system which has an improved guide sheave assembly minimizing the axial and lateral forces imposed upon the levelwind feedscrew.
  • Another object of the invention is to provide a levelwind traversing automatic two-speed control for a helicopter winching system which deploys and retrieves a cable consisting of two sections of different diameters.
  • Still another object of the invention is to provide an improved winching system for a helicopter which effectively develops a reliable signal of cable tow force.
  • a winch device for a helicopter for deploying and retrieving a cable having two sections of different diameter.
  • the levelwind guide pulley is caused to traverse its feedscrew at a rate according to the diameter of the cable being payed and the selection of the traversing speed is automatically controlled.
  • the guide pulley is mounted on both a feedscrew and a reaction bar by a trunnion and carriage assembly which transmits the horizontal component of cable tension into the reaction bar with minimum frictional resistance to lateral motion along the feedscrew.
  • the guide pulley sheave assembly is supported from below by a reaction strut to reduce to an insignificant amount the axial and lateral forces on the feedscrew and hence the power required to drive the feedscrew, and a load cell is mounted at the strut attachment so as to sense the vertical component of the force applied by the cable as it passes over the guide pulley.
  • FIG. 1 is a simplified representation of a helicopter showing the location of the winching system within the helicopter fuselage.
  • FIG. 2 is a perspective view of the winching system.
  • FIG. 3 is a diagrammatic representation of the winching system showing the various drum and guide sheave pulley drives and the automatic control of the traversing speed of the guide pulley.
  • FIG. 4 is a schematic front view of the guide sheave assembly showing the guide pulleys trunnion mounting and the guide sheaves reaction strut.
  • FIG. 5 is a schematic side view of the guide sheave assembly.
  • FIG. 6 is a schematic top view of the trunnion and carriage assembly for the guide sheavepulley.
  • FIG. 7 is a view along line 7-7 in FIG. 6.
  • FIG. 8 is a view along line 8-8 in 'FIG. 6.
  • FIG. 1 helicopter 10 is shown and a 'portion of the sidewall of fuselage 12 is broken away to show the relative location of winching system 14 therein.
  • Winch controls are located within the helicopter fuselage and operated by a crew member 16 stationed therein, although various of the winch controls and indicators are also located within pilot compartment 18.
  • the winching system generally includes frame 20 attached to cargo deck 22, drum 24, drum drive 26, guide sheave assembly and levelwind mechanism 28, and swivel fairlead 30 mounted within opening 32 in the cargo deck.
  • a cable having two sections of different diameter, the larger diameter portion of which is indicated at 34, is wound on drum 24 and passes over guide pulley 36 in guide sheave assembly 28 and through swivel fairlead 30 to the outside.
  • FIG. 3 is a diagrammatic showing of the drum and guide sheave assembly and levelwind mechanism illustrating the various drum and guide sheave pulley drives and the automatic control of the traversing speed of the guide sheave assembly.
  • Drum 24 is shown with large cable 34 and small cable 38 wrapped thereon, in this embodiment the large cable being laid on with substantially fewer wraps per layer than the small cable.
  • drum is driven by reversible hydraulic drive motor 40 through gearbox 42 which is directly connected to the drum and drivingly connected by chain 44 to intermediate shaft 46 supported by frame 20.
  • the intermediate shaft has sprockets 48 and 50 at opposite ends thereof and these sprockets in turn are selectively drivingly connected to feedscrew 52.
  • Sprocket 48 is connected by chain 54 to sprocket 56 freely mounted on one end of the feedscrew and sprocket 50 is connected by chain 58 to sprocket 60 freely mounted on the other end of the feedscrew.
  • Each of sprockets 56 and 60 is secured to one element of a saw tooth type clutch, sprocket 56 being-connected to clutch-element 62 and sprocket 60 being connected to clutch element 64.
  • Push rod 66 is located within feedscrew 52 and is slidably connected thereto by splines.
  • Clutch elements 68 and 70 are mounted on opposite ends of the push rod, clutch element 68 being designed to cooperate with clutch element 62 adjacent sprocket 56, and clutch element 70 being designed to cooperate with clutch element 64 adjacent sprocket 60.
  • the push rod is slid back and forth within feedscrew 52 by hydraulic actuator 72, as will be explained below, so that either clutch elements 62 and 68 are in engagement and sprocket 48, chain 54 and sprocket 56 drive the feedscrew at one speed dependent upon the sprocket combination, or clutch elements 64 and 70 are engaged and sprocket 50, chain 58 and sprocket 60 drive the feedscrew at a second speed dependent upon the sprocket combination.
  • Feedscrew 52 has double helical groove 74 machined therein with a transition curve at each end.
  • Guide pulley 36 is mounted on trunnion and carriage assembly 76 which in turn is mounted on feedscrew 52 and reaction bar 78 as will be explained.
  • the trunnion and carriage assembly and in turn the guide pulley and guide sheave assembly traverse back and forth along feedscrew 52 at a rate determined by the particular sprocket and chain drive which is operative in accordance with the position of piston 80 within hydraulic actuator 72.
  • the piston is connected to an extension of push rod 66 by bearing 82 permitting relative rotational movement of the push rod and feedscrew with respect to the piston rod.
  • Hydraulic pressure is admitted to chamber 84 below the piston-by line 86 or to chamber 88 above the piston by line 90. When pressure fluid is admitted to either chamber, the other chamber is connected by a return line to a reservoir.
  • the admission of pressure to hydraulic actuator 72 is controlled by twoposition solenoid valve 92.
  • push rod 66 When hydraulic pressure is admitted to chamber 84, push rod 66 is moved in a direction to engage clutch elements 64 and 70 so that feedscrew 52 is driven by sprockets 50 and 60 and chain 58.
  • hydraulic pressure is admitted to chamber 88, push rod 66 is moved to disengage clutch elements 64 and 70 and engage clutch elements 62 and 68 so that feedscrew 52 is driven by sprockets 48 and 56 and chain 54.
  • Solenoid valve 92 is operated by auto-control unit 94.
  • This unit provides the electrical signals to activate the levelwind feed rate change and a traction drive (not shown) for guide pulley 36.
  • the traction drive is a motor which tends to drive the guide pulley faster than the moving cable would turn it during paying out of the cable so as to maintain cable tension between drum 24 and the guide pulley to pay out the cable properly.
  • the auto-control unit includes screw 96 which is driven through gears 98 by gear 100 on drum shaft 102. Nut and striker plate 104 is mounted on screw 96 and travels from one end of the screw to the other, actuating a plurality of microswitches, 106,108 and 1 10, during its travel.
  • Microswitches 106 and 110 at opposite ends of screw 96 are on-off switches which shut down the drum drive when the extremes of motion are reached.
  • Microswitch 108 is electrically connected to solenoid valve 92 and is actuated when the nut and striker plate travels along the right end (as shown) portion of screw 96.
  • the relative position of microswitch 108 is determined by the need to start wrapping the larger-smaller diame- 4 ter junction of the cable at one extreme side of drum 24.
  • the position of each of the microswitches along the screw is adjustable, and additional microswitches can be used for other control purposes.
  • Feedscrew 52 and reaction bar 78 are mounted in and supported, as is the whole guide sheave assembly and levelwind mechanism 28, by levelwind arms 112 and 114. These arms are pivotally connected to frame 20, as can be seen in FIG. 5, at the point of support for intermediate shaft 46. The arms serve to transmit the horizontal component of cable tension into winch frame 20.
  • Guide pulley 36 and trunnion and carriage assembly 76 on which the guide pulley is mounted are part of guide sheave and levelwind assembly 28 which is shown in FIGS. 4 and 5.
  • guide pulley 36 is mounted between side plates 116 and 118, and the side plates are connected to the upper end of reaction strut 120.
  • the lower end of the reaction strut is pivotally connected to swivel fairlead 30 by link 122 (FIG. 5).
  • the trunnion mounting of the guide sheave assembly 28 on trunnion and carriage assembly 76 permits the guide sheave to tilt from side to side about the longitudinal axis of reaction bar 78 when the guide sheave assembly traverses feedscrew 52 as can be seen in FIG. 4
  • FIG. 6 is a top, partial section view of the guide pulley and carriage assembly.
  • Carriage 124 has bores 126 and 128 therein for feedscrew 52 and reaction bar 78, respectively. It also has projections 130 and 132 at opposite ends which constitute the base for the trunnion bearing connection with the guide sheave.
  • the trunnion is comprised of two halves 134 and 136 to permit ready assembly as can be seen in FIG. 7 which is a section view along line 77 in FIG. 6. The halves are held together by bolts 138 and 140 to form a unitary member which is journaled to carriage projections 130 and 132 by bearings 142 and 144.
  • the outer surface of the trunnion is circular and forms the base for bearing 146 on which guide pulley 36 is mounted and which permits the guide pulley to rotate about the trunnion and carriage assembly. Further, circular flanges 148 and 150 on the trunnion join with side plates'll6 and 118, respectively.
  • Carriage 124 has chamber 152 therein for feedscrew follower 154 as can be seen in FIG. 6, and FIG. 8 which is a section view along line 8-8 in FIG. 6.
  • the follower has finger 156 thereon which is adapted to fit into helical groove 74 on feedscrew 52 so that the carriage as sembly will follow the track of the groove, moving back and forth across the feedscrew.
  • the follower is free to rotate in chamber 152, and thus reverse its position at each end of the helical groove, and is loaded by spring washer 158 which is held in place by chamber cover 160.
  • I-Iat shaped brackets 162 and 164 are attached to the face of carriage 124. Each bracket serves as a mounting for a shaped roller which rolls on reaction bar 78 along its longitudinal axis. Bracket 162 supports roller 166 on pin 168 and bracket 164 supports roller 170 on pin 172. The rollers are grooved as can be seen in FIG. 8 at 174 on roller 170. They are mounted to transmit cable loading to the reaction bar and to minimize the power needed for traversing of the guide sheave.
  • load cell 176 is shown mounted between the upper end of reaction strut 120 and a base bracket supported by side plates 116 and 118.
  • the load cell is essentially an electrical strain gage which reacts the vertical component of cable tension.
  • pressure roller l78 imposes loading of the cable on the guide pulley at all times, and guide roller 180 helps to maintain the cable on the guide pulley.
  • two cable cutters, 182 and 184, are installed in the guide sheave below the pulley. The cutters are operated by explosive charges electrically fired and each is capable of severing either the larger diameter or the smaller diameter cable sections.
  • the cutters are spaced apart. To eliminate the possibility of jamming after partial cutting, they are sequentially fired, the lower cutter being fired after the upper cutter.
  • Guide rollers 186, 188, 190 and 192 serve to keep cable alignment as the cable passes through the two cutters, and rollers 194 serve to guide the cable into swivel fairlead 30.
  • a cable winch for use with a helicopter, the winch including a drum and a guide sheave assembly mounted in a frame and a swivel fairlead;
  • a cable winch for use with a helicopter, the winch including a drum and a guide sheave assembly mounted in a frame and a swivel fairlead;
  • a cable winch for use with a helicopter including a drum and a guide sheave assembly mounted in a frame and a swivel fairlead;-
  • a cable winch for use with a helicopter including a drum and a guide sheave assembly mounted in a frame and a swivel fairlead, said guide sheave assembly mounting including:
  • a cable winch for use with a helicopter including a drum and a guide sheave assembly mounted in a frame and a swivel fairlead, said guide sheave assembly mounting including;
  • trunnion mounting means permitting tilting on said guide sheave assembly in a vertical plane as it traverses;
  • a cable winch for a helicopter installation said winch including a guide sheave assembly having a guide pulley subject to horizontal and vertical loads imposed by the cable;
  • reaction means in said trunnion and carriage assembly for absorbing the horizontal component of cable load
  • reaction means connected to said guide sheave assembly for absorbing the vertical component of cable load
  • a level wind mechanism having a two-speed drive for traversing of the guide pulley
  • a cable winch for a helicopter installation said winch including a guide sheave assembly having a guide pulley subject to horizontal and vertical loads imposed by the cable;
  • reaction means in said trunnion and carriage assembly for absorbing the horizontal component of cable load
  • reaction means connected to said guide sheave assembly for absorbing the vertical component of cable load
  • a levelwind mechanism having a two-speed drive for traversing of the guide pulley
  • a cable winch for use with a helicopter including a drum, a reversible drum drive, a guide sheave assembly including a guide pulley and levelwind mechanism, and a swivel fairlead;
  • said levelwind mechanism including a feedscrew and reaction bar; a trunnion and carriage assembly for mounting said guide sheave assembly on said feedscrew and reaction bar, said feedscrew having a helical groove for traversing said guide sheave assembly,
  • said trunnion and carriage assembly including bearing means permitting rotation of said guide sheave assembly in a vertical plane about said feedscrew and reaction bar as said guide sheave assembly traverses said feedscrew; driving and associated clutching elements for driving said feedscrew at two different speeds;
  • said switch means being operated by rotation of said drum
  • rollers in said trunnion and carriage assembly for transmitting the horizontal component of cable tension into said reaction bar; a reaction strut for supporting vertical loading on said guide sheave assembly; and t means mounted between said guide sheave assembly and said reaction strut for producing a signal of cable tension.
  • a cable winch for use with a helicopter including a drum, a reversible drum drive, a guide sheave assembly including a guide pulley and levelwind mechanism, and a swivel fairlead;
  • said levelwind mechanism including a feedscrew and reaction bar
  • a trunnion and carriage assembly for mounting said guide sheave assembly on said feedscrew and reaction bar, said feedscrew having a helical groove for traversing said guide'sheave assembly,
  • said trunnion and carriage assembly including bearing means permitting rotation of said guide sheave assembly in a vertical plane about said feedscrew and reaction bar as said guide sheave assembly traverses said feedscrew;
  • rollers in said trunnion and carriage assembly for transmitting the horizontal component of cable tension into said reaction bar
  • reaction strut for supporting vertical loading on said guide sheave assembly
  • reaction strut being pivotally connected to said swivel fairlead'to permit said reaction strut to follow traversing motion of said guide sheave assembly.
  • a cable winch for use with a helicopter including a drum, a reversible drum drive, a guide sheave assembly including a guide pulley and levelwind mechanism, and a swivel fairlead;
  • said levelwind mechanism including a feedscrew and reaction bar
  • a trunnion and carriage assembly for mounting said guide sheave assembly on said feedscrew and reaction bar
  • said feedscrew having a helical groove for traversing said guide sheave assembly
  • said trunnion and carriage assembly including bearing means permitting rotation of said guide sheave assembly in a vertical plane about said feedscrew and reaction bar as said guide sheave assembly traverses said feedscrew;
  • a cable winch for use with a helicopter including a drum, a reversible drum drive, a guide sheave assembly including a guide pulley and levelwind mechanism, and a swivel fairlead;
  • said levelwind mechanism including a feedscrew and reaction bar; a trunnion and carriage assembly for mounting said guide sheave assembly on said feedscrew and reaction bar, said feedscrew having a helical groove for traversing said guide sheave assembly,
  • said trunnion and carriage assembly including bearing means permitting rotation of said guide sheave assembly in a vertical plane about said feedscrew and reaction bar as said guide sheave assembly traverses said feedscrew;
  • reaction strut for supporting vertical loading on said guide sheave assembly, said reaction strut being pivotally connected to said swivel fairlead to permit said reaction strut to follow traversing motion of said guide sheave assembly.
  • a cable winch for use with a helicopter including a drum, a reversible drum drive, a guide sheave assembly including a guide pulley and levelwind mechanism, and a swivel fairlead;
  • said levelwind mechanism including a feedscrew and reaction bar
  • a trunnion and carriage assembly for mounting said guide sheave assembly on said feedscrew and reaction bar
  • said feedscrew having a helical groove for traversing said guidesheave assembly
  • said trunnion and carriage assembly including bearing means permitting rotation of said guide sheave assembly in a vertical plane about said 9 Q 10 feedscrew and reaction bar as said guide sheave transmitting the horizontal component of cable assembly traverses said feedscrew; tension into said reaction bar;
  • a hydraulic actuator for operating said clutching elesaid reaction strut being pivotally connected to said ments for selectively changing feedscrew speed swivel fairlead to permit said reaction strut to folduring cable deploy and retrieval; low traversing motion of said guide sheave as an electrically actuated switch for operating said hysembly; and a draulic actuator, load cell mounted between said guide sheave assemsaid switch being operated by rotation of said bly and said reaction strut for producinga signal of drum, cable tension.

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  • Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)
  • Pulleys (AREA)
US00304287A 1972-11-06 1972-11-06 Winch system for helicopter Expired - Lifetime US3809334A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US00304287A US3809334A (en) 1972-11-06 1972-11-06 Winch system for helicopter
CA183,669A CA982110A (en) 1972-11-06 1973-10-18 Winch system for helicopter
DE19732352700 DE2352700A1 (de) 1972-11-06 1973-10-20 Seilwinde, insbesondere fuer hubschrauber
GB4933073A GB1437385A (en) 1972-11-06 1973-10-23 Winch system for helicopter
JP48123293A JPS4980753A (it) 1972-11-06 1973-11-01
IT30906/73A IT999202B (it) 1972-11-06 1973-11-05 Sistema a verricello per elicottero

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00304287A US3809334A (en) 1972-11-06 1972-11-06 Winch system for helicopter

Publications (1)

Publication Number Publication Date
US3809334A true US3809334A (en) 1974-05-07

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00304287A Expired - Lifetime US3809334A (en) 1972-11-06 1972-11-06 Winch system for helicopter

Country Status (6)

Country Link
US (1) US3809334A (it)
JP (1) JPS4980753A (it)
CA (1) CA982110A (it)
DE (1) DE2352700A1 (it)
GB (1) GB1437385A (it)
IT (1) IT999202B (it)

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US20200017339A1 (en) * 2018-07-12 2020-01-16 Hall Labs, Llc Resealable Line Guide
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US20200277169A1 (en) * 2019-02-28 2020-09-03 T-Max (Hangzhou) Technology Co., Ltd. Winch, rope guide and transmission device having clutch function
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US20210403296A1 (en) * 2018-11-06 2021-12-30 Woods Hole Oceanographic Institution Universal Level Wind System for Winch Assembly
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FR3143581A1 (fr) * 2022-12-16 2024-06-21 HIROLA Ingénierie Dispositif de maintien en tension d’un élément souple ou semi-rigide sur un cylindre en rotation

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Also Published As

Publication number Publication date
CA982110A (en) 1976-01-20
GB1437385A (en) 1976-05-26
DE2352700A1 (de) 1974-05-16
IT999202B (it) 1976-02-20
JPS4980753A (it) 1974-08-03

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