US3788266A - Multi-powerhead outboard motor - Google Patents

Multi-powerhead outboard motor Download PDF

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Publication number
US3788266A
US3788266A US00330597A US3788266DA US3788266A US 3788266 A US3788266 A US 3788266A US 00330597 A US00330597 A US 00330597A US 3788266D A US3788266D A US 3788266DA US 3788266 A US3788266 A US 3788266A
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United States
Prior art keywords
crankshafts
outboard motor
extending
propeller shaft
cylinders
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Expired - Lifetime
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US00330597A
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English (en)
Inventor
C Strang
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Outboard Marine Corp
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Outboard Marine Corp
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Publication date
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H23/00—Transmitting power from propulsion power plant to propulsive elements
    • B63H23/02—Transmitting power from propulsion power plant to propulsive elements with mechanical gearing
    • B63H23/10—Transmitting power from propulsion power plant to propulsive elements with mechanical gearing for transmitting drive from more than one propulsion power unit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H20/00—Outboard propulsion units, e.g. outboard motors or Z-drives; Arrangements thereof on vessels
    • B63H20/14—Transmission between propulsion power unit and propulsion element
    • B63H20/20—Transmission between propulsion power unit and propulsion element with provision for reverse drive
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B61/00—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing
    • F02B61/04—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving propellers
    • F02B61/045—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving propellers for marine engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B73/00—Combinations of two or more engines, not otherwise provided for

Definitions

  • an outboard motor comprising a lower unit'rigidly connected to the bottom of a drive [21] Appl' 330597 shaft housing and including a rotatably mounted propeller shaft supporting a propeller, first and second 52 US. Cl. 115/17, 60/97 R engines respectively including first and Second crank- 51 1111.
  • the invention relates generally to outboard motors and more particularly to outboard motors including two engines. Examples of prior patents disclosing outboard motors with two engines include the US. Moran Pat. No. 2,737,143 issued Mar. 6, 1956 and the US Tenney Pat. No. 3,025,823 issued Mar. 20, 1962.
  • crankshafts are drivingly connected adjacent to the engine block.
  • parallel drive shafts extend from parallel crankshafts.
  • the invention provides an outboard motor including a single drive shaft housing and connected lower unit, together with two separate engines mounted to the top of the drive shaft housing with respective crankshafts extending at an acute angle to each other and connected to the upper end of respective co-axially extending drive shafts which extend through the drive shaft housing and into the lower unit and which, at their lower ends, are connected by gearing to a single propeller shaft rotatably supported in the lower unit.
  • the engines are laterally spaced from each other and include respective pluralities of cylinders having axes extending in parallel relation to the propeller shaft.
  • the engines are oppositely facing, i.e., the cylinders of one engine extend forwardly from the associated crankshaft and the cylinders of the other engine extend rearwardly from the associated crankshaft.
  • the crankshafts and respectively connected drive shafts extend in an acute angle to each other when viewed from a vertical plane perpendicular to the propeller shaft and in parallel relation to each other when viewed from a vertical plane parallel to the propeller shaft.
  • the engines are spaced in the fore and aft direction, i.e., axially of the propeller shaft, and include respective pluralities of cylinders having axes extending in parallel relation to one another and in lateral relation to the propeller shaft.
  • the engines are oppositely facing, i.e., the cylinders of one engine extend laterally from the associated crankshaft in one direction and the cylinders of the other engine extend laterally of the associated crankshaft in the opposite direction.
  • the crankshafts and the respectively connected drive shafts extend in a plane common to the propeller shaft and at an acute angle to each other when viewed from a vertical plane in parallel relation to the propeller shaft.
  • One of the principal objects of the invention is the provision of a multi-engine outboard motor having a single lower unit with a minimum frontal area.
  • an outboard motor including a single drive shaft housing and a pair of internal combustion engines mounted to the top of the drive shaft housing in such manner as to facilitate exhaust gas tuning and conventional discharge of exhaust gases through the drive shaft housing.
  • Another of the principal objects of the invention is the provision of a high horsepower outboard motor which is light in weight per unit of horsepower, which is simple in design, economical to construct, and which delivers maximum effective horsepower.
  • FIG. 1 is a side elevational view, partially in section, of one embodiment of an outboard motor incorporating various of the features of the invention.
  • FIG. 2 is a transverse view, partially in section, of the outboard motor shown in FIG. 1.
  • FIG. 3 is a schematic view of an alternate arrangement for connecting the drive shafts and propeller shaft shown in FIGS. 1 and 2.
  • FIG. 4 is a side elevational view, partially in section, of a second embodiment of an outboard motor incorporating various of the features of the invention.
  • FIG. 5 is a transverse view, partially in section, of the outboard motor shown in FIG. 4.
  • FIG. 6 is a schematic view of an alternate construction for connecting the drive shafts and the propeller shaft shown in FIGS. 4 and 5.
  • FIGS. 1 and 2 Shown in FIGS. 1 and 2 is an outboard motor 11 including a propulsion unit 13 comprising a single, hollow drive shaft housing 15 and a lower unit 17 rigidly connected to the lower end of the drive shaft housing 15 and rotatably supporting a propeller shaft 19 carrying a propeller 21. Also included in the propulsion unit 13 are two generally identically constructed, internal combustion engines 23 and 25, which are respectively rigidly secured to the top of the drive shaft housing 15.
  • the propulsion unit 13 means adapted to be attached to a boat transom and affording both vertical and horizontal swinging movement of the propulsion unit 13 relative to the boat transom.
  • such means comprises a transom bracket 31 adapted to be attached to the boat transom, and a swivel bracket 33 which is pivotally connected to the transom bracket 31 about a horizontal tilt axis 35 to afford vertical swinging movement therebetween and which is pivotally connected to the propulsion unit 13 about a steering axis 37 provided by a king pin 39.
  • each of the engines 23 and is of generally conventional construction and can be of various multi-cylinder designs
  • each engine 23 and 25 includes three cylinders 41 each having associated therewith a spark plug 43 and an individual carburetor 45.
  • the engines 23 and 25 include respective crankshafts 47 and 49 operatively connected with pistons (not shown) respectively operable in the cylinders 41.
  • Respective fly wheels 51 are attached to the top of the respective crankshafts 47 and 49.
  • the engines 23 and 25 are mounted with their crankshafts 47 and 49 in acute angular relation to each other and, in the embodiment shown in FIGS. 1 and 2, in laterally spaced relation to each other and with one engine facing forwardly, i.e, with the cylinders 41 extending forwardly from the crankshaft 47 and with the other engine 25 extending rearwardly, i.e., with the cylinders 41 extending rearwardly from the crankshaft 49, and in parallel relation to the propeller shaft 19 and to the other cylinders 41.
  • the upper end of the drive shaft housing 15 is designed to provide two angularly oriented mounting surfaces 55 and 57 which extend at an obtuse angle to each other when viewed from in front, i.e., when viewed from a vertical plane extending perpendicular to the propeller shaft 19.
  • first and second drive shafts 61 and 63 are respectively suitably coupled in any conventional manner to the first and second crankshafts 47 and 49 and extend co-axially with the respective crankshafts 47 and 49 downwardly within the drive shaft housing 15 and into the lower unit 17 for driving connection through suitable gearing 65 with the propeller shaft 19.
  • the drive shafts 61 and 63 When viewed from the side, i.e., from a vertical plane extending parallel to the propeller shaft 19, the drive shafts 61 and 63 extend vertically in generally parallel relation to each other and in adjacently spaced relation in the fore and aft direction, and when viewed from the front, i.e., from a vertical plane perpendicular to the propeller shaft 19, the drive shafts 61 and 63 extend in acute angular relation to each other and converge adjacent to the propeller shaft 19. Any suitable means can be employed to rotatably support the drive shafts 61 and 63 in the drive shaft housing 15 and in the lower unit 17.
  • the drive shaft housing 15 and lower unit 17 are generally of upwardly open V shape and neck-down to a minimal frontal area in the vicinity immediately above the gearcase portion 69 of the lower unit. Only the lower, relatively narrow portion of the V shape configuration is normally immersed in water during operation. Specifically, only that area of the lower unit 17 located below the cavitation plate 67 is normally located underwater during operation.
  • FIG. 1 Various gearing arrangements can be used to connect the drive shafts 61 and 63 to each other and to the propeller shaft 19.
  • two right angle bevel gears 71 and 73 spaced axially of the propeller shaft 19 are pinned at 75 to the propeller shaft 19 for common rotation therewith and are respectively in mesh with bevel gears 77 and 79 respectively carried by the drive shafts 61 and 63.
  • the drive shafts 61 and 63 both rotate in the same rotative direction.
  • FIG. 3 Shown in FIG. 3 is another gearing arrangement for drivingly connecting the drive shafts 61 and 63 to the propeller shaft 19.
  • a compound gear 81 is mounted in the lower unit 17 in coaxial relation to the propeller shaft 19 and for relative rotation therebetween.
  • the compound gear 81 includes oppositely facing right angle bevel gears 83 and 85 in respective engagement with the bevel gears 77 and 79 fixed to the respective drive shafts 61 and 63.
  • a second right angle bevel gear'87 is also rotatably mounted by the lower unit in co-axial relation to the propeller shaft 19 and for relative rotation therebetween.
  • the second bevel gear '87 is located aft of the compound gear 81 and is in mesh with the bevel gear 77 on the aft drive shaft 61.
  • a dog clutch 89 which is selectively engageable with the bevel gears 83 and 87 so as to afford forward, neutral, and reverse drive connection of the drive shafts 61 and 63 to the propeller shaft 19.
  • Various arrangements can be employed to shift the clutch dog 89.
  • Connection of both of the drive shafts 61 and 63 to the compound gear 81 serves to interconnect the engines 23 and 25 one to another and, as a result, the drive shafts 61 and 63 counter rotate with respect to each other.
  • FIGS. 4 and 5 Shown in FIGS. 4 and 5 is another embodiment of an outboard motor 111 embodying various of the features of the invention.
  • the outboard motor 111 includes a propulsion unit 1 13 which is connected to a swivel bracket 133 for horizontal steering therebetween and, in turn, the swivel bracket 133 is connected to a transom bracket 131 for vertical swinging movement relative thereto.
  • the propulsion unit 113 includes a hollow drive shaft housing 115 and a lower unit 1 17 which is rigidly attached to the bottom of the drive shaft housing 1 15 and which rotatably supports a propeller shaft 119 carrying a propeller 121.
  • the engines 123 and 125 respectively include crankshafts 147 and 149 which are operably connected through pistons (not shown) in the cylinders 141.
  • the engines 123 and 125 are spaced from each other and are rigidly mounted to the upper end of the drive shaft housing 115 so that the crankshafts 147 and 149 extend at an acute angle to each other.
  • the engines 123 and 125 are located in fore and aft spaced relation to each other, i.e., are spaced axially of the propeller shaft 119, with the forward engine 123 facing to one side, i.e., with the cylinders 141 extending laterally from the crankshaft 147 to the left as shown in FIG.
  • the drive shaft housing 115 includes, at the upper end thereof, two fore and aft angularly related mounting areas 155 and 157 to which the engines 123 and 125 are respectively rigidly connected.
  • the drive shafts 161 and 163 extend in co-planar relation with each other and with the propeller shaft 119 and in fore and aft spaced relation.
  • the drive shafts 161 and 163 extend in acute relation to each other and converge in the downward direction.
  • Various suitable bearing means can be employed to rotatably support the drive shafts 161 and 163 in the drive shaft housing 115 and in the lower unit 117.
  • the lower unit has a relatively narrow frontal area between the cavitation plate 167 and the gear case 169.
  • FIG. 6 Shown in FIG. 6 is another gearing arrangement including a reversing transmission.
  • the gearing arrangement is similar to that disclosed in FIGS. 4 and 5 except that the compound gear 181 is not pinned to the drive shaft 119 and is rotatable relative thereto and supported from the lower unit 117 in co-axial relation to the propeller shaft 119.
  • a second bevel gear 187 which is mounted in spaced relation aft of the compound gear 181 and in co-axial relation to the propeller shaft 119 for relative rotation therebetween.
  • the second bevel gear 187 is smaller than the rearwardly facing gear 185 on the compound gear 181 and is also in mesh with the bevel gear 179 on the after drive shaft 163.
  • a clutch dog 189 Located between the bevel gears 183 and 187 is a clutch dog 189 which is slidable axially on the propeller shaft 119 and which rotates in common with the propeller shaft 119 and which is selectively engageably with the bevel gears 185 and 187 to provide forward, neutral, and reverse drive conditions.
  • Various arrangements can be employed to shift the dog clutch between its various positions.
  • Both of the disclosed embodiments incorporate two separate and generally identical engines which are separately and rigidly mounted in spaced and angular relation to each other on the top of a drive shaft housing.
  • Such arrangement allows exhaust gas discharge through the drive shaft housing using conventional techniques and without interference from gearing located above or within the drive shaft housing.
  • tuning tubes can be employed so as to improve engine performance and exhaust gas discharge can be either through a snout 200 as shown in FIGS. 1 and 4 or through a propeller hub as is also conventional.
  • one-half of the total horsepower of the outboard motor i.e., the output of each engine, is directly transmitted from the applicable engine to the propeller shaft through independent drive shafts and through bevel gearing which is smaller than if the entire horsepower output of the outboard motor were transmitted through a single set of bevel gears.
  • the frontal area of the lower unit can be relatively small so as to avoid power losses due to water resistance.
  • the drive shafts can enter the lower unit in relatively adjacent relation to each other in the fore and aft direction, and thereby avoid excessive length in the fore and aft dimension of the lower unit.
  • connection of the drive shafts to each other in the lower unit either through a compound gear (see FIGS. 3, 4 and 6) or through a propeller shaft (see FIG. 1) serves to avoid problems associated with equalizing power delivery through a double drive shaft arrangement powered by a single engine.
  • the disclosed constructions provide an outboard motor or relatively high horsepower output with a relatively small lower unit frontal area and with minimum weight, economic cost, and power loss, and with freedom from various of the complexities found in the prior art.
  • An outboard motor comprising a propulsion unit including a drive shaft housing, a lower unit rigidly connected to the bottom of said drive shaft housing and including a rotatably mounted propeller shaft supporting a propeller, first and second engines respectively including first and second crankshafts and being respectively mounted to the top of said drive shaft housing with said first and second crankshafts extending at an acute angle to each other, first and second drive shafts respectively drivingly connected to said first and second crankshafts and respectively extending in said drive shaft housing and in said lower unit in co-axial relation to said first and second crankshafts, and gearing in said lower unit drivingly connecting said first and second drive shafts to said propeller shaft and means adapted to be connected to a boat hull and connected to said propulsion unit to afford vertical and horizontal swinging movement of said propulsion unit relative to the boat hull.
  • An outboard motor in accordance with claim 2 wherein all of said cylinders have axis extending laterally to said propeller shaft and said cylinders of said first engine extend laterally from said first crankshaft in one direction and said cylinders of said second engine extend laterally from said second crankshaft in the direction opposite from said one direction.
  • An outboard motor propulsion unit including a drive shaft housing, a lower unit rigidly connected to the bottom of said drive shaft housing and including a rotatably mounted propeller shaft supporting a propeller, first and second engines mounted to the top of said drive shaft housing in laterally spaced relation to each other and respectively including respective first and second crankshafts, and respective pluralities of cylinders extending in parallel relation to one another in parallel relation to said propeller shaft with said cylinders of said first engine extending forwardly of said first crankshaft and said cylinders of said second engine extending rearwardly of said second crankshaft, first and second drive shafts respectively drivingly connected to said first and second crankshafts and respectively extending in said drive shaft housing and in said lower unit in co-axial relation to said first and second crankshafts, said first and second drive shafts extending at an acute angle to each other when viewed in a vertical plane perpendicular to said propeller shaft and extending in parallel relation to each other when viewed in a vertical plane parallel to said propeller shaft, and gearing in
  • An outboard motor propulsion unit including a drive shaft housing, a lower unit rigidly connected to the bottom of said drive shaft housing and including a rotatably mounted propeller shaft supporting a propeller, first and second engines respectively rigidly mounted to the top of said drive shaft housing in spaced relation to each other axially of said propeller shaft and including respective first and second crankshafts extending at an acute angle' to each other, and respective pluralities of cylinders extending in parallel relation to one another with said cylinders of said first engine extending laterally from said first crankshaft in one direction and said cylinders of said second engine extending laterally from said second crankshaft in the direction opposite from said one direction, first and second drive shafts respectively drivingly connected to said first and second crankshafts and respectively extending in said drive shaft housing and in said lower unit in co-axial relation to said first and second crankshafts, said first and second drive shafts extending in a common vertical plane containing said propeller shaft and at an acute angle to each other when viewed in a vertical plane extending parallel to

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)
US00330597A 1973-02-08 1973-02-08 Multi-powerhead outboard motor Expired - Lifetime US3788266A (en)

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US33059773A 1973-02-08 1973-02-08

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JP (1) JPS5741397B2 (enrdf_load_html_response)
CA (1) CA982882A (enrdf_load_html_response)
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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4615683A (en) * 1983-08-24 1986-10-07 Sanshin Kogyo Kabushiki Kaisha Outboard motor
US20070240427A1 (en) * 2003-02-24 2007-10-18 Pratt & Whitney Canada Corp. Compact compound engine package
WO2010031579A3 (de) * 2008-09-22 2011-01-06 Mtu Friedrichshafen Gmbh Antriebseinheit für ein wasserfahrzeug
WO2011122962A1 (en) * 2010-03-31 2011-10-06 Scana Volda As Propeller propulsion system for floating structures
CN106005341A (zh) * 2010-02-11 2016-10-12 塞文船舶有限公司 用于海上船舶应用的大型舷外马达及其相关的制造和操作方法
EP3175088A1 (en) * 2014-07-28 2017-06-07 Oxford Two Stroke Limited Internal combustion engine
DE102017223402A1 (de) 2017-12-20 2019-06-27 Zf Friedrichshafen Ag Antriebsvorrichtung für Boote
US10647400B2 (en) 2010-02-11 2020-05-12 Ab Volvo Penta Large outboard motor including variable gear transfer case
US11377187B2 (en) * 2018-07-05 2022-07-05 Oxe Marine Ab Outboard motor

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5317095U (enrdf_load_html_response) * 1976-07-26 1978-02-14
SE412565B (sv) * 1978-10-02 1980-03-10 Karlstad Mekaniska Ab Marint propelleraggregat
JP6819661B2 (ja) * 2018-09-28 2021-01-27 日本製鉄株式会社 ステンレス箔の溶接方法および溶接構造体

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2708416A (en) * 1951-05-31 1955-05-17 Falk Corp Marine drive
US3025823A (en) * 1958-12-29 1962-03-20 William L Tenney Outboard motor construction
US3148557A (en) * 1962-03-22 1964-09-15 Outboard Marine Corp Twin counter-rotating drive shaft engine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2708416A (en) * 1951-05-31 1955-05-17 Falk Corp Marine drive
US3025823A (en) * 1958-12-29 1962-03-20 William L Tenney Outboard motor construction
US3148557A (en) * 1962-03-22 1964-09-15 Outboard Marine Corp Twin counter-rotating drive shaft engine

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4615683A (en) * 1983-08-24 1986-10-07 Sanshin Kogyo Kabushiki Kaisha Outboard motor
US20070240427A1 (en) * 2003-02-24 2007-10-18 Pratt & Whitney Canada Corp. Compact compound engine package
US7654087B2 (en) * 2003-02-24 2010-02-02 Pratt & Whitney Canada Corp. Compact compound engine package
WO2010031579A3 (de) * 2008-09-22 2011-01-06 Mtu Friedrichshafen Gmbh Antriebseinheit für ein wasserfahrzeug
US10384755B2 (en) 2010-02-11 2019-08-20 Seven Marine, Llc Large outboard motor for marine vessel application and related methods of making and operating same
US10384756B2 (en) 2010-02-11 2019-08-20 Seven Marine, Llc Large outboard motor for marine vessel application and related methods of making and operating same
US11059554B2 (en) 2010-02-11 2021-07-13 Ab Volvo Penta Large outboard motor for marine vessel application and related methods of making and operating same
US10933962B2 (en) 2010-02-11 2021-03-02 Ab Volvo Penta Large outboard motor for marine vessel application and related methods of making and operating same
CN106005341A (zh) * 2010-02-11 2016-10-12 塞文船舶有限公司 用于海上船舶应用的大型舷外马达及其相关的制造和操作方法
US10647400B2 (en) 2010-02-11 2020-05-12 Ab Volvo Penta Large outboard motor including variable gear transfer case
US10239597B2 (en) 2010-02-11 2019-03-26 Seven Marine, Llc Large outboard motor for marine vessel application and related methods of making and operating same
US10358201B2 (en) 2010-02-11 2019-07-23 Seven Marine, Llc Large outboard motor for marine vessel application and related methods of making and operating same
US10358200B2 (en) 2010-02-11 2019-07-23 Seven Marine, Llc Large outboard motor for marine vessel application and related methods of making and operating same
CN102933458A (zh) * 2010-03-31 2013-02-13 斯堪娜沃尔达有限公司 用于漂浮结构的螺旋桨推进系统
WO2011122962A1 (en) * 2010-03-31 2011-10-06 Scana Volda As Propeller propulsion system for floating structures
US9463853B2 (en) 2010-03-31 2016-10-11 Scana Volda As Propeller propulsion system for floating structures
CN102933458B (zh) * 2010-03-31 2016-03-02 斯堪娜沃尔达有限公司 用于漂浮结构的螺旋桨推进系统
EP3175088A1 (en) * 2014-07-28 2017-06-07 Oxford Two Stroke Limited Internal combustion engine
DE102017223402A1 (de) 2017-12-20 2019-06-27 Zf Friedrichshafen Ag Antriebsvorrichtung für Boote
US11377187B2 (en) * 2018-07-05 2022-07-05 Oxe Marine Ab Outboard motor

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JPS49111393A (enrdf_load_html_response) 1974-10-23
CA982882A (en) 1976-02-03
SE395423B (sv) 1977-08-15
JPS5741397B2 (enrdf_load_html_response) 1982-09-02

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