JP2014046698A - Propeller guard - Google Patents
Propeller guard Download PDFInfo
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- JP2014046698A JP2014046698A JP2012188446A JP2012188446A JP2014046698A JP 2014046698 A JP2014046698 A JP 2014046698A JP 2012188446 A JP2012188446 A JP 2012188446A JP 2012188446 A JP2012188446 A JP 2012188446A JP 2014046698 A JP2014046698 A JP 2014046698A
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- propeller
- propeller guard
- water flow
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Abstract
Description
本発明は、船舶走行を推進するプロペラ（スクリュープロペラ）を保護するためのプロペラガードに関する。 The present invention relates to a propeller guard for protecting a propeller (screw propeller) that propels ship traveling.
プロペラガードは、船外機であるプロペラの周囲に取り付けて、プロペラに海中の浮遊物等の異物が衝突してプロペラが破壊される事態を防止するものである。円筒形であることが多く、樹脂や金網で作製されることが多い。しかしながら、プロペラガードを取り付けると、船が進むときの抵抗（推進抵抗）となるため、燃費悪化や速度低下をもたらすことになる。そこで、特許文献１および２に記載されるように種々の改良が提案されているが、推進力を向上し得るプロペラガードのさらなる要望がある。
The propeller guard is attached around a propeller, which is an outboard motor, and prevents the propeller from being destroyed by collision of foreign matter such as floating matter in the sea with the propeller. It is often cylindrical and is often made of resin or wire mesh. However, when the propeller guard is attached, resistance (propulsion resistance) when the ship moves forward causes deterioration of fuel consumption and speed reduction. Thus, various improvements have been proposed as described in
本発明は、推進抵抗を少なくし、簡易な構造で船舶の推進力を増大させ得るプロペラガードを提供することを目的とする。 An object of the present invention is to provide a propeller guard that can reduce propulsion resistance and increase the propulsive force of a ship with a simple structure.
本発明は上記の問題を解決するために、以下の発明を提供するものである。
（１）船舶走行を推進するプロペラを保護するために該プロペラの周囲に、該プロペラと離れて配設されたプロペラガードであり；該プロペラガードは、内側部材と外側部材から構成される二重管構造を有し、その内側部材と外側部材の間に形成される二重管内部は中空であるか、または発泡体を充填してなるプロペラガード。
（２）二重管の内側部材と外側部材が異なる形状を有する上記（１）に記載のプロペラガード。
（３）二重管が接合加工により製作される上記（１）または（２）に記載のプロペラガード。
（４）プロペラガードの外側部材において、水流に対し後端部に凹凸を形成し、該後端部近傍での水流を内側に向けるように構成した上記（１）〜（３）のいずれかに記載のプロペラガード。
（５）プロペラガードが、円錐台形または円筒形状であり、かつ水流に対し前端部の径が後端部の径よりも大きい上記（１）〜（４）のいずれかに記載のプロペラガード。
（６）二重管構造が水密である上記（１）〜（５）のいずれかに記載のプロペラガード。
（７）プロペラガードの密度が０．９〜１．４である上記（１）〜（６）のいずれかに記載のプロペラガード。
The present invention provides the following inventions in order to solve the above problems.
(1) A propeller guard disposed around the propeller to protect the propeller for propelling the ship traveling and disposed away from the propeller; the propeller guard is a double member composed of an inner member and an outer member. A propeller guard having a tube structure, the inside of the double tube formed between the inner member and the outer member being hollow or filled with foam.
(2) The propeller guard according to (1), wherein the inner member and the outer member of the double pipe have different shapes.
(3) The propeller guard according to (1) or (2), wherein the double pipe is manufactured by joining.
(4) In any one of the above (1) to (3), in the outer member of the propeller guard, an unevenness is formed at the rear end portion with respect to the water flow, and the water flow in the vicinity of the rear end portion is directed inward. The described propeller guard.
(5) The propeller guard according to any one of (1) to (4), wherein the propeller guard has a truncated cone shape or a cylindrical shape, and a diameter of a front end portion is larger than a diameter of a rear end portion with respect to a water flow.
(6) The propeller guard according to any one of (1) to (5), wherein the double pipe structure is watertight.
(7) The propeller guard according to any one of (1) to (6), wherein the propeller guard has a density of 0.9 to 1.4.
本発明によれば、簡易な構造で船舶の推進力を増大させ得るプロペラガードを提供し得る。 ADVANTAGE OF THE INVENTION According to this invention, the propeller guard which can increase the propulsive force of a ship with a simple structure can be provided.
本発明のプロペラガードは、船舶走行を推進するプロペラ（スクリュープロペラ）を保護するためにプロペラの周囲に、プロペラと離れて配設される。船舶としては、好適には小型〜中型船舶に適用され、最適にはゴムボートに適用される。プロペラは、通常、船尾部に取り付けられ、エンジンが回転するとプロペラも回転し、船尾後方に向けて早い水流を形成し、その反力で船舶を前進させる。プロペラは、通常、金属で作製され、回転軸（ボスまたはハブ）に２枚以上のブレードが取り付けられて構成される。ブレードの形状は楕円、扇形等である。 The propeller guard of the present invention is disposed around the propeller and away from the propeller in order to protect the propeller (screw propeller) that propels the ship traveling. As a ship, it is preferably applied to a small to medium-sized ship, and optimally applied to a rubber boat. The propeller is usually attached to the stern part, and when the engine rotates, the propeller also rotates to form a fast water flow toward the stern rear, and the reaction force causes the ship to advance. The propeller is usually made of metal and is configured by attaching two or more blades to a rotating shaft (boss or hub). The shape of the blade is an ellipse, a sector, or the like.
本発明のプロペラガードは、内側部材と外側部材から構成される二重管構造を有し、その内側部材と外側部材の間に形成される二重管内部は中空であるか、または発泡体を充填してなる。二重管の材質は、金属、樹脂等の必要な剛性を有するもの、またはこれらの組み合わせであってもよい。 The propeller guard of the present invention has a double pipe structure composed of an inner member and an outer member, and the double pipe formed between the inner member and the outer member is hollow or foamed. Filled. The material of the double tube may be a metal, a resin, or the like having a required rigidity, or a combination thereof.
発泡体を用いる場合、特に制限されないが、樹脂の発泡体が好適に用いられ、最適には発泡スチロール、発泡ウレタン等の低密度発泡体が用いられる。 In the case of using a foam, although not particularly limited, a resin foam is preferably used, and optimally, a low-density foam such as polystyrene foam or urethane foam is used.
二重管の内側部材と外側部材は、異なる形状を有するのが好ましく、たとえば後述する図１に示されるように、内側部材においては水流に対し前端部付近で対数関数曲線のような曲線部を有し、他方、外側部材は中央付近で少し膨らみを有する。 The inner member and the outer member of the double tube preferably have different shapes. For example, as shown in FIG. 1 described later, the inner member has a curved portion such as a logarithmic function curve near the front end portion with respect to the water flow. On the other hand, the outer member has a slight bulge near the center.
二重管は、溶接、ろう付け、接着、加締め等の接合加工により製作され得、製造コストを低減することができる。 A double pipe can be manufactured by joining processes, such as welding, brazing, adhesion | attachment, and crimping, and can reduce manufacturing cost.
形状の相異なる内側部材と外側部材を一体で製作して二重管とするには、板金加工にしても、樹脂の成型にしても大掛かりな型や工程が必要となるが、接合により製作する場合には各部材を別々に製作できるので、コストを低減し得る。 In order to manufacture an inner member and an outer member having different shapes integrally to form a double pipe, a large mold or process is required for sheet metal processing or resin molding. In some cases, since each member can be manufactured separately, the cost can be reduced.
プロペラガードの二重管構造は水密であるのが好ましいが、水流に対し後端部を開口させることもできる。すなわち、空気をプロペラガードの後部へ排気する孔を設け、小さな気泡により水流をプロペラガードから離れやすくし、抵抗を低減させることができる。 The double-pipe structure of the propeller guard is preferably watertight, but the rear end can be opened to the water flow. That is, a hole for exhausting air to the rear part of the propeller guard is provided, and the water flow is easily separated from the propeller guard by the small bubbles, so that the resistance can be reduced.
さらに、本発明のプロペラガードは、水流に対し後端部に凹凸を形成し、後端部近傍での水流を内側に向けるように構成するのが好適である。たとえば、外側部材の後端部に複数の山形部（シェブロン）に設け、プロペラガードの外側部材に沿って流れる水流を、外側部材の後端部近傍で内側に向け、プロペラ後部の水流速度の大きな部分に水流を合流させ、撹拌することにより、水流速度を下げる効果がある。水流速度を下げることにより、プロペラ後部に水の壁のような部分が形成されるので、プロペラの推進力を増大し得る。このように、本発明によれば、プロペラ周辺に水流を集めることができるので、プロぺラ表面にかかる圧力の低下を防止し得、突然気泡が発生するキャビテーションの発生を抑制し得る。 Furthermore, it is preferable that the propeller guard of the present invention is configured so that the rear end of the water flow is uneven and the water flow in the vicinity of the rear end is directed inward. For example, a plurality of chevron portions (chevrons) are provided at the rear end portion of the outer member, and the water flow flowing along the outer member of the propeller guard is directed inward in the vicinity of the rear end portion of the outer member so that the water flow velocity at the rear portion of the propeller is high By bringing the water flow into the part and stirring, there is an effect of reducing the water flow speed. By reducing the water flow velocity, a propeller propulsion can be increased because a water-like wall is formed at the rear of the propeller. As described above, according to the present invention, since the water flow can be collected around the propeller, the pressure applied to the propeller surface can be prevented from being lowered, and the occurrence of cavitation in which bubbles are suddenly generated can be suppressed.
例えば図２に模式的に示されるように、プロペラ１の周囲に設けられるプロペラガード２の形状は、円錐台形または円筒形であるのが好適であり、水流３に対し前端部の径が後端部の径よりも大きいのが最適である。
For example, as schematically shown in FIG. 2, the shape of the
本発明において、プロペラガードにより発生する浮力の大きさが、海水等の水中においてプロペラガードの重さを大略打ち消す程度であるのが好適である。このような浮力を発生させるために、プロペラガードの密度は０．９〜１．４から選ばれ、取り付けられたゴムボート等の船舶の挙動に影響を与えたくないときには、１．０程度、から選ばれるのが好適である。なお、プロペラガードの材質として金属を用いるとき、ソリッド（中実）金属の比重はたとえば７．６以上であるので、二重管構造の中空もしくは発泡体の部分を調整して、プロペラガードの密度を所望の密度に調節し得る。 In the present invention, it is preferable that the size of the buoyancy generated by the propeller guard is such that the weight of the propeller guard is substantially canceled in water such as seawater. In order to generate such buoyancy, the density of the propeller guard is selected from 0.9 to 1.4, and when it is not desired to affect the behavior of a ship such as an attached rubber boat, it is selected from about 1.0. Is preferred. When using metal as the propeller guard material, the solid (solid) metal has a specific gravity of, for example, 7.6 or more. Therefore, the density of the propeller guard can be adjusted by adjusting the hollow or foam portion of the double pipe structure. Can be adjusted to the desired density.
プロペラガードの固定方法は、特に制限されず、船体（船底もしくは船尾部）またはたはプロペラ取り付け部等の船外機に固定し得る。 The method for fixing the propeller guard is not particularly limited, and can be fixed to an outboard motor such as a hull (bottom or stern) or a propeller attachment.
以下に、図１とともに本発明のプロペラガードについてさらに具体的に説明する。図１は、本発明のプロペラガードにおける一態様を模式的に示す図である。図１において、プロペラ１の周囲にプロペラガード２が設けられ、プロペラガード２は、形状の異なる外側部材２−１と内側部材２−２が一体に接合された二重管構造を形成し、二重管構造は中空もしくは発泡体の部分２−３を有する。３は水流を示し、外側部材に水流３に対し後端部に凹凸（山形部）を図３に示すように形成される。図３において、４は山形部、５は尾根、６は溝を示し、尾根５および溝６は水流方向（軸方向）に沿って形成されており、後端部近傍での水流を内側に向けるように作用する。
Hereinafter, the propeller guard of the present invention will be described in more detail with reference to FIG. FIG. 1 is a diagram schematically showing one aspect of the propeller guard of the present invention. In FIG. 1, a
本発明は、推進抵抗を少なくし、簡易な構造で船舶の推進力を増大させ得るプロペラガードを提供する。 The present invention provides a propeller guard that can reduce propulsion resistance and increase the propulsive force of a ship with a simple structure.
１ プロペラ
２ プロペラガード
２−１ 外側部材
２−２ 内側部材
２−３ 中空もしくは発泡体の部分
３ 水流
４ 山形部
５ 尾根
６ 溝
DESCRIPTION OF SYMBOLS 1
Claims (7)
該プロペラガードは、内側部材と外側部材から構成される二重管構造を有し、その内側部材と外側部材の間に形成される二重管内部は中空であるか、または発泡体を充填してなるプロペラガード。 A propeller guard disposed around the propeller and spaced apart from the propeller to protect the propeller that promotes marine travel;
The propeller guard has a double pipe structure composed of an inner member and an outer member, and the inside of the double pipe formed between the inner member and the outer member is hollow or filled with foam. Propeller guard.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012188446A JP2014046698A (en) | 2012-08-29 | 2012-08-29 | Propeller guard |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012188446A JP2014046698A (en) | 2012-08-29 | 2012-08-29 | Propeller guard |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2014046698A true JP2014046698A (en) | 2014-03-17 |
Family
ID=50606808
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2012188446A Pending JP2014046698A (en) | 2012-08-29 | 2012-08-29 | Propeller guard |
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| Country | Link |
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| JP (1) | JP2014046698A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10638968B2 (en) | 2015-09-10 | 2020-05-05 | Fujifilm Corporation | Skin gloss evaluation device, skin gloss evaluation method, and skin gloss evaluation program |
Citations (13)
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|---|---|---|---|---|
| JPS55178497U (en) * | 1979-06-11 | 1980-12-22 | ||
| JPS56138092A (en) * | 1980-04-01 | 1981-10-28 | Hitachi Zosen Corp | Vessel provided with nozzle |
| JPS5863593A (en) * | 1981-09-26 | 1983-04-15 | 曽 俊雄 | Screen pipe effect type propeller nozzle |
| JPS6232896U (en) * | 1985-08-13 | 1987-02-26 | ||
| JPH01161998U (en) * | 1988-04-28 | 1989-11-10 | ||
| JPH0921658A (en) * | 1995-07-10 | 1997-01-21 | Tech Res & Dev Inst Of Japan Def Agency | Towing cable for test |
| JP3145444B2 (en) * | 1991-10-16 | 2001-03-12 | 東燃ゼネラル石油株式会社 | Lubricating oil composition for automatic transmission |
| JP2008024072A (en) * | 2006-07-19 | 2008-02-07 | Universal Shipbuilding Corp | Stern duct and vessel equipped with the same |
| EP1990273A2 (en) * | 2007-05-09 | 2008-11-12 | Solas Science & Engineering Co., Ltd. | Propelling system for boat |
| JP2009513421A (en) * | 2005-01-24 | 2009-04-02 | エンヴァイロプロップ コーポレーション | Improved underwater propulsion device shroud |
| US20100311290A1 (en) * | 2007-11-26 | 2010-12-09 | Cape Advanced Engineering (Proprietary ) Limited | Propulsion System For A Watercraft |
| JP2011042201A (en) * | 2009-08-20 | 2011-03-03 | Universal Shipbuilding Corp | Stern duct with small blades and vessel |
| JP2011218915A (en) * | 2010-04-07 | 2011-11-04 | Haruo Ota | Propeller-water-flow improving device |
-
2012
- 2012-08-29 JP JP2012188446A patent/JP2014046698A/en active Pending
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55178497U (en) * | 1979-06-11 | 1980-12-22 | ||
| JPS56138092A (en) * | 1980-04-01 | 1981-10-28 | Hitachi Zosen Corp | Vessel provided with nozzle |
| JPS5863593A (en) * | 1981-09-26 | 1983-04-15 | 曽 俊雄 | Screen pipe effect type propeller nozzle |
| JPS6232896U (en) * | 1985-08-13 | 1987-02-26 | ||
| JPH01161998U (en) * | 1988-04-28 | 1989-11-10 | ||
| JP3145444B2 (en) * | 1991-10-16 | 2001-03-12 | 東燃ゼネラル石油株式会社 | Lubricating oil composition for automatic transmission |
| JPH0921658A (en) * | 1995-07-10 | 1997-01-21 | Tech Res & Dev Inst Of Japan Def Agency | Towing cable for test |
| JP2009513421A (en) * | 2005-01-24 | 2009-04-02 | エンヴァイロプロップ コーポレーション | Improved underwater propulsion device shroud |
| JP2008024072A (en) * | 2006-07-19 | 2008-02-07 | Universal Shipbuilding Corp | Stern duct and vessel equipped with the same |
| EP1990273A2 (en) * | 2007-05-09 | 2008-11-12 | Solas Science & Engineering Co., Ltd. | Propelling system for boat |
| US20100311290A1 (en) * | 2007-11-26 | 2010-12-09 | Cape Advanced Engineering (Proprietary ) Limited | Propulsion System For A Watercraft |
| JP2011042201A (en) * | 2009-08-20 | 2011-03-03 | Universal Shipbuilding Corp | Stern duct with small blades and vessel |
| JP2011218915A (en) * | 2010-04-07 | 2011-11-04 | Haruo Ota | Propeller-water-flow improving device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10638968B2 (en) | 2015-09-10 | 2020-05-05 | Fujifilm Corporation | Skin gloss evaluation device, skin gloss evaluation method, and skin gloss evaluation program |
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