US20200331574A1 - Boat propeller - Google Patents

Boat propeller Download PDF

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Publication number
US20200331574A1
US20200331574A1 US16/408,880 US201916408880A US2020331574A1 US 20200331574 A1 US20200331574 A1 US 20200331574A1 US 201916408880 A US201916408880 A US 201916408880A US 2020331574 A1 US2020331574 A1 US 2020331574A1
Authority
US
United States
Prior art keywords
stream
impeller
shaft
casing
gear box
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.)
Abandoned
Application number
US16/408,880
Other languages
English (en)
Inventor
Yeun-Junn Lin
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.)
Solas Science & Engineering Co Ltd
Original Assignee
Solas Science & Engineering Co Ltd
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 Solas Science & Engineering Co Ltd filed Critical Solas Science & Engineering Co Ltd
Assigned to SOLAS SCIENCE & ENGINEERING CO., LTD. reassignment SOLAS SCIENCE & ENGINEERING CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LIN, YEUN-JUNN
Publication of US20200331574A1 publication Critical patent/US20200331574A1/en
Abandoned legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H5/00—Arrangements on vessels of propulsion elements directly acting on water
    • B63H5/07—Arrangements on vessels of propulsion elements directly acting on water of propellers
    • B63H5/14—Arrangements on vessels of propulsion elements directly acting on water of propellers characterised by being mounted in non-rotating ducts or rings, e.g. adjustable for steering purpose
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H5/00—Arrangements on vessels of propulsion elements directly acting on water
    • B63H5/07—Arrangements on vessels of propulsion elements directly acting on water of propellers
    • B63H5/16—Arrangements on vessels of propulsion elements directly acting on water of propellers characterised by being mounted in recesses; with stationary water-guiding elements; Means to prevent fouling of the propeller, e.g. guards, cages or screens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H1/00—Propulsive elements directly acting on water
    • B63H1/02—Propulsive elements directly acting on water of rotary type
    • B63H1/12—Propulsive elements directly acting on water of rotary type with rotation axis substantially in propulsive direction
    • B63H1/14—Propellers
    • B63H1/20—Hubs; Blade connections
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H1/00—Propulsive elements directly acting on water
    • B63H1/02—Propulsive elements directly acting on water of rotary type
    • B63H1/12—Propulsive elements directly acting on water of rotary type with rotation axis substantially in propulsive direction
    • B63H1/14—Propellers
    • B63H1/28—Other means for improving propeller efficiency
    • 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
    • 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
    • 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
    • B63H23/06—Transmitting power from propulsion power plant to propulsive elements with mechanical gearing for transmitting drive from a single propulsion power unit
    • 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
    • B63H23/32—Other parts
    • B63H23/34—Propeller shafts; Paddle-wheel shafts; Attachment of propellers on shafts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H5/00—Arrangements on vessels of propulsion elements directly acting on water
    • B63H5/07—Arrangements on vessels of propulsion elements directly acting on water of propellers
    • B63H5/16—Arrangements on vessels of propulsion elements directly acting on water of propellers characterised by being mounted in recesses; with stationary water-guiding elements; Means to prevent fouling of the propeller, e.g. guards, cages or screens
    • B63H5/165—Propeller guards, line cutters or other means for protecting propellers or rudders

Definitions

  • the present invention relates to boat propellers, and more particularly to a boat propeller that helps to improve propulsive efficiency.
  • the existing boat propellers structurally have an outer shaft housing, an inner shaft housing, and a plurality of blades.
  • the inner shaft housing is received in the outer shaft and is connected to the inner peripheral surface of the outer shaft through a plurality of rib portions.
  • Each of the blades is integratedly connected to the outer peripheral surface of the outer shaft.
  • the primary objective of the present invention is to provide a boat propeller that has improved propulsive efficiency.
  • the disclosed propeller comprises a gear box, an impeller, a stream-guiding ring, and a stream-shaping nozzle.
  • the gear box includes a casing and a transmission shaft.
  • the transmission shaft is rotatably installed in the casing, and the transmission shaft has its front end received in the casing so that its rear end juts out the casing.
  • the impeller has an impeller shaft that includes an outer shaft housing and a hollow inner shaft housing, both being hollow columnar.
  • the inner shaft housing is received in the outer shaft housing and is connected to the outer shaft housing through a plurality of rib portions, while being coaxially connected to the transmission shaft of the gear box, so that the impeller is driven by the transmission shaft of the gear box to rotate.
  • the impeller further has a plurality of vanes that are integratedly formed on the outer peripheral surface of the outer shaft.
  • the stream-guiding ring is assembled to the casing of the gear box and houses the impeller, so that the impeller rotating draws water streams into the stream-guiding ring.
  • the stream-shaping nozzle is connected to the rear end of the stream-guiding ring, for shaping the water stream drawn into the stream-guiding ring.
  • the disclosed propeller has its water inlet diameter maximized, thereby improving propulsive efficiency.
  • the impeller is unlikely to harm fishes, swimmers or divers around the bottom of the boat. This allows a boat having a shallow draft safe to be used. Even if the impeller is not fully immersed in water, propulsion can still be provided desirably.
  • the stream-shaping nozzle has a ring portion, a hollow axial portion, and a plurality of stream-shaping portions.
  • the ring portion is connected to the rear end of the stream-guiding ring.
  • the hollow axial portion is defined in the ring portion and coaxially connected to the outer shaft housing of the impeller shaft of the impeller.
  • the stream-shaping portions are connected between the ring portion and the hollow axial portion and arranged equidistantly to circle the hollow axial portion.
  • the stream-shaping nozzle uses the stream-shaping portions to shape the water stream excited by the impeller into linear ejections, thereby facilitating boat propulsion.
  • the casing of the gear box has a tapered shaft.
  • the tapered shaft and the impeller shaft of the impeller do not contact each other. Instead, an exhaust channel is left therebetween. Thereby, when the boat moves backward, the exhaust gas generated by the engine can escape through the exhaust channel and will not interfere with water streams to cause turbulence.
  • the inner shaft housing of the impeller is indirectly connected to the transmission shaft of the gear box through a bushing.
  • the bushing has a shock-absorbing layer and a metal layer wrapping the shock-absorbing layer.
  • the shock-absorbing layer serves to absorb impact and prevent the metal layer from burst while protecting the transmission shaft from damage.
  • FIG. 1 is a perspective view of a boat propeller of the present invention.
  • FIG. 2 is an exploded view of the boat propeller of the present invention.
  • FIG. 3 is a point view of an impeller in the boat propeller of the present invention.
  • FIG. 4 is a side view of the boat propeller of the present invention.
  • FIG. 5 is a rear view of the boat propeller of the present invention.
  • FIG. 6 is a partial cross-sectional view of the boat propeller of the present invention.
  • a boat propeller 10 comprises a gear box 20 , an impeller 30 , a stream-guiding ring 50 , and a stream-shaping nozzle 60 .
  • the gear box 20 is provided with a casing 21 .
  • the casing 21 has a tapered shaft 22 , an upper wing 23 , a lower wing 24 , a connecting portion 25 and an anti-swirl baffle 26 .
  • the tapered shaft 22 has a changing cross-sectional area that becomes larger as it extends backward.
  • the upper wing 23 and the lower wing 24 are integratedly connected to top and bottom sides of the tapered shaft 22 , respectively.
  • the connecting portion 25 is integratedly connected to the top of the upper wing 23 and is configured to engage with an engine housing, which is known in the art and not shown herein.
  • the anti-swirl baffle 26 integratedly is connected between the upper wing 23 and the connecting portion 25 .
  • the gear box 20 further has a transmission shaft 27 .
  • the gear reduction unit is installed in the casing 21 , and is configured to connect a driving shaft of an engine, both known in the art and not shown herein.
  • the transmission shaft 27 has its front end received in the tapered shaft 22 of the casing 21 and connected to the gear reduction unit.
  • the transmission shaft 27 has its rear end jutting out the casing 21 provided with a toothed portion 28 .
  • the impeller 30 has an impeller shaft 31 and four vanes 38 .
  • the impeller shaft 31 has a hollow columnar outer shaft housing 32 and a hollow columnar inner shaft housing 33 .
  • the inner shaft housing 33 is coaxially received in the outer shaft housing 32 and is connected to the outer shaft housing 32 through four rib portions 37 .
  • the vanes 38 are integratedly connected to the outer peripheral surface of the outer shaft housing 32 .
  • the outer shaft housing 32 has an engaging flange 34 integratedly extending outward from its rear end (as shown in FIG. 6 ), and the inner shaft housing 33 has a retaining flange 35 and four positioning recesses 36 formed on the inner peripheral surface in front of the retaining flange 35 (as shown in FIG. 3 and FIG. 6 ).
  • the impeller 30 is indirectly connected to the transmission shaft 27 of the gear box 20 through a bushing 40 .
  • the bushing 40 has a shock-absorbing layer 41 and a metal layer 43 wrapping the shock-absorbing layer 41 .
  • the shock-absorbing layer 41 has its outer peripheral surface provided with a plurality of positioning ridges 42
  • the metal layer 43 has its inner peripheral surface formed with a toothed channel 44 .
  • the bushing 40 uses the four positioning ridges 42 on the shock-absorbing layer 41 to pair up and engage with the four positioning recesses 36 of the inner shaft housing 33 , and on the other hand uses the toothed channel 44 of the metal layer 43 to engage with the toothed portion 28 of the transmission shaft 27 .
  • two gaskets 46 are arranged at front and rear ends of the impeller shaft 31 for the transmission shaft 27 to pass.
  • a nut 47 is assembled to hold all the components together, thereby making the impeller 30 and the transmission shaft 27 well assembled.
  • the transmission shaft 27 of the gear box 20 can transmit power generated by the engine to the impeller 30 through the bushing 40 , thereby driving the impeller 30 to operate.
  • the shock-absorbing layer 41 serves to absorb impact and to prevent the metal layer 43 from burst while protecting the transmission shaft 27 from damage. Moreover, in the assembly of the impeller 30 and the transmission shaft 27 , there is no direct contact between the impeller shaft 31 and the tapered shaft 22 of the casing 21 . Instead, an exhaust channel 45 is left there between to allow escape of exhaust gas (as shown in FIG. 6 ).
  • two upper supports 51 are symmetrically fixed using fixing members 53 such as screws.
  • the upper supports 51 jointly hold the anti-swirl baffle 26 in position and then the upper supports 51 can be further fixed using fixing members 54 such as screws.
  • a lower support 52 is fixed using fixing members 55 such as screws.
  • the lower support 52 holds the lower wing 24 in position and the lower wing 24 can be further fixed using fixing members 56 such as screws.
  • the stream-shaping nozzle 60 has a ring portion 61 , a hollow axial portion 62 , and eight stream-shaping portions 63 .
  • the ring portion 61 is fixed to the rear end of the stream-guiding ring 50 using fixing members 64 such as screws.
  • the ring portion 61 has a changing cross-sectional area that becomes smaller as it extends backward.
  • the hollow axial portion 62 is defined in the ring portion 61 .
  • the hollow axial portion 62 has its front end provided with an engaging socket 65 .
  • the engaging socket 65 of the hollow axial portion 62 coaxially receives the engaging flange 34 of the impeller shaft 31 of the impeller 30 (as shown in FIG. 6 ).
  • the stream-shaping portions 63 are integratedly connected between the ring portion 61 and the hollow axial portion 62 while being arranged equidistantly to circle the hollow axial portion 62 . Thereby, water streams drawn into the stream-guiding ring 50 by the impeller 30 are well shaped into eight linear streams by the eight stream-shaping portions 63 of the stream-shaping nozzle 60 . Then the stream-shaping nozzle 60 jets the linear streams backward to provide the boat with propulsion.
  • the boat propeller 10 of the present invention has the following advantageous over the prior-art devices:
  • the impeller 30 With the protection provided by the stream-guiding ring 50 , the impeller 30 is unlikely to harm fishes, swimmers or divers around to bottom of the boat. This allows a boat having a shallow draft safe to be used. Even if the impeller 30 is not fully immersed in water, propulsion can still be provided desirably.
  • the stream-guiding ring 50 may be made of aluminum alloy which is of high strength. In this case, the boat propeller 10 is more resident to impact and has a longer service life.
  • the stream-shaping nozzle 60 uses the eight stream-shaping portions 63 to shape the water stream excited by the impeller 30 into linear ejections. This prevents swirls from formed at the back of the impeller 30 and in turn helps to improve propulsive efficiency.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Exhaust Silencers (AREA)
US16/408,880 2019-04-18 2019-05-10 Boat propeller Abandoned US20200331574A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TW108113633A TWI700215B (zh) 2019-04-18 2019-04-18 船用推進器
TW108113633 2019-04-18

Publications (1)

Publication Number Publication Date
US20200331574A1 true US20200331574A1 (en) 2020-10-22

Family

ID=66379759

Family Applications (1)

Application Number Title Priority Date Filing Date
US16/408,880 Abandoned US20200331574A1 (en) 2019-04-18 2019-05-10 Boat propeller

Country Status (8)

Country Link
US (1) US20200331574A1 (fr)
EP (1) EP3725667A1 (fr)
JP (1) JP2020175877A (fr)
CN (1) CN111824379A (fr)
AU (2) AU2019203143B1 (fr)
CA (1) CA3042665A1 (fr)
MX (1) MX2019006213A (fr)
TW (1) TWI700215B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114379752A (zh) * 2021-12-09 2022-04-22 南通海国机械有限公司 一种船舶用前置预旋导轮

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US4182118A (en) * 1971-04-18 1980-01-08 Chronic Bill M Jet propulsion engine
US5752864A (en) * 1997-01-16 1998-05-19 Brunswick Corporation Reverse gate for personal watercraft
US5928042A (en) * 1998-03-26 1999-07-27 Glenn F. Mattina Propeller guard
US6283805B1 (en) * 1998-05-28 2001-09-04 Ishiqaki Company Limited Water jet propulsion type outboard motor
CN2334673Y (zh) * 1998-06-24 1999-08-25 林允进 舷外机螺旋桨
US6190218B1 (en) * 1999-09-27 2001-02-20 Outboard Marine Corporation Pump jet with redirected exhaust gas through stator vane for drag reduction
JP3807480B2 (ja) * 2000-07-03 2006-08-09 株式会社石垣 ウォータージェット推進式水中翼船
WO2002062659A1 (fr) 2001-02-08 2002-08-15 Ishigaki Company Limited Moteur hors-bord
JP3891114B2 (ja) 2001-02-21 2007-03-14 株式会社石垣 ウオータージェット推進式船外機
GB2375747B (en) * 2001-05-25 2005-03-16 Padraic Costello Propeller guard or propeller ring
CN2545089Y (zh) * 2002-04-30 2003-04-16 林允进 动力船艇用的推进设备
US6675736B1 (en) * 2002-09-12 2004-01-13 Brunswick Corporation Boat having channels formed in its hull
CA2604978A1 (fr) * 2004-05-25 2005-12-08 Sword Marine Technology, Inc. Systeme hors-bord de propulsion marine a reaction et levier de commande associe
CN2761524Y (zh) * 2004-12-30 2006-03-01 株式会社石垣 喷水推进式舷外机
CN100441477C (zh) * 2004-12-30 2008-12-10 株式会社石垣 喷水推进式舷外机
TWM310175U (en) * 2006-10-23 2007-04-21 Solas Science & Engineering Co Boat propeller
CN201046774Y (zh) * 2007-05-09 2008-04-16 般若科技股份有限公司 船用推进器的螺旋桨
KR200472995Y1 (ko) * 2012-09-06 2014-06-10 대우조선해양 주식회사 선회식 추진기
TWI608962B (zh) * 2016-01-27 2017-12-21 Solas Science & Engineering Co Ltd Double-piece shaft sleeve for marine propeller and marine propeller using the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114379752A (zh) * 2021-12-09 2022-04-22 南通海国机械有限公司 一种船舶用前置预旋导轮

Also Published As

Publication number Publication date
TW202039311A (zh) 2020-11-01
EP3725667A1 (fr) 2020-10-21
AU2020201971A1 (en) 2020-05-21
CA3042665A1 (fr) 2020-10-18
CN111824379A (zh) 2020-10-27
AU2019203143B1 (en) 2020-05-07
TWI700215B (zh) 2020-08-01
MX2019006213A (es) 2020-10-19
JP2020175877A (ja) 2020-10-29

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Date Code Title Description
AS Assignment

Owner name: SOLAS SCIENCE & ENGINEERING CO., LTD., TAIWAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:LIN, YEUN-JUNN;REEL/FRAME:049320/0548

Effective date: 20190418

STPP Information on status: patent application and granting procedure in general

Free format text: NON FINAL ACTION MAILED

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION