JPS60185698A - Water stream adjusting device of ship propulsion device - Google Patents

Abstract

PURPOSE:To avoid generation of cavitation so as to improve turning characteristics by arranging a hole from which water can flow out at a portion facing backward of its propulsive direction on both right and left sides of a casing which is positioned under-water while a ship sails. CONSTITUTION:Inside a casing 14, a water chamber 22 is formed dividedly and a flowing-in hole 23 through which outside water can be introduced into the water chamber 22 is arranged on a portion facing forward of its propulsive direction on both right and left sides of the casing 14 that is positioned under-water while a ship sails. A flowing-out hole 24 through which water inside the water chamber 22 can flow out by dynamic pressure of a water stream which operates on the flown-in hole 23 while sailing of the ship is arranged at a portion facing backward of its propulsive direction on both right and left sides of the casing 14 which is positioned under-water while sailing of the ship. At the time of turning, a water stream against the casing 14 has an angle of attack alpha and negative pressure which generates on the circumference of the backward portion is restrained, thus generation of cavitation is prevented.

Description

【発明の詳細な説明】 ［技術分野］ 本発明は船舶推進機の水流調整装置に関する。[Detailed description of the invention] [Technical field] The present invention relates to a water flow adjustment device for a marine vessel propulsion device.

［背景技術］ 船外機、船内外機等の船舶推進機は、ドライブユニット
を収容するケーシングの横断面形状を翼形状とし、ケー
シングそのものを舵として機能させている。[Background Art] In marine propulsion devices such as outboard motors and inboard/outboard motors, a casing that houses a drive unit has a wing-shaped cross section, and the casing itself functions as a rudder.

しかしながら、上記船舶推進機の転舵操作による旋回時
には、ケーシングに対する水の流れが迎え角を持つよう
になり、水の当たらない側の後方部分の周囲にキャビテ
ーションを生じ、従ってケーシングの翼側面によって水
を効率よくガイドすることができず、旋回性を阻害する
おそれがある。However, when turning due to the steering operation of the above-mentioned marine propulsion system, the water flow toward the casing has an angle of attack, causing cavitation around the rear part of the side that is not hit by the water, and therefore the water flow is caused by the wing side of the casing. It is not possible to guide the wheels efficiently, which may impede turning performance.

［発明の目的］ 本発明は、ケーシングの左右両側面で推進方向の後方を
臨む部分におけるキャビテーションの発生を防止し、旋
回性を向上することを目的とする。[Object of the Invention] An object of the present invention is to prevent the occurrence of cavitation in the portions facing rearward in the propulsion direction on both left and right side surfaces of the casing, and to improve turning performance.

［発明の構成］ 上記目的を達成するために、本発明は、ケーシングにド
ライブユニットを収容してなる船舶推進機の水流調整装
置であって、航走時に水中に位置するケーシングの左右
両側面で推進方向の後方を臨む部分に、水が流出可能と
される孔ン配設してなるようにしたものである。[Structure of the Invention] In order to achieve the above object, the present invention provides a water flow adjustment device for a marine vessel propulsion device in which a drive unit is housed in a casing, and the present invention provides a water flow adjustment device for a marine vessel propulsion device which is configured to accommodate a drive unit in a casing, and which propulsion device is provided on both left and right sides of the casing located underwater during navigation. A hole is provided in the rear facing part to allow water to flow out.

［発明の詳細な説明］ 以下、本発明の実施例を図面を参照して説明する。[Detailed description of the invention] Embodiments of the present invention will be described below with reference to the drawings.

第１図は本発明の第１実施例に係る船内外機ｌＯを示す
断面図、第２図は第１図の側面図、第３図は第１図のｍ
−ｍ線に沿う略示断面図である。FIG. 1 is a sectional view showing an inboard/outboard motor lO according to a first embodiment of the present invention, FIG. 2 is a side view of FIG. 1, and FIG.
It is a schematic cross-sectional view along the -m line.

船内外機ＩＯは、船体１１にトランサムプレート１２を
固定し、トランサムプレート１２に略水平軸まわりを回
動可能にフォークステアリング１３を支持し、フォーク
ステアリング１３に略垂直軸まわりを回動可能すなわち
転舵可能にケーシング１４を支持している。なお、１５
は、先端部をケーシング１４の頭一部に結合し、トラン
サムプレートに不図示の中間部を支持され、不図示の基
端部に加える操舵力によってケーシング１４を転舵操作
可能とする操舵ハンドルである。The inboard/outboard motor IO has a transom plate 12 fixed to the hull 11, a fork steering 13 supported on the transom plate 12 so as to be rotatable around a substantially horizontal axis, and a fork steering 13 rotatable around a substantially vertical axis, i.e., rotatable on the fork steering 13. It supports the casing 14 so that it can be steered. In addition, 15
is a steering handle whose distal end is connected to a head portion of the casing 14, whose intermediate portion (not shown) is supported by a transom plate, and which allows the casing 14 to be steered by a steering force applied to a base end (not shown). be.

船体１１の内部には不図示のエンジンが配置され、エン
ジンの出力は、ドライブユニットを構成する伝動軸１６
、前後進切換装置１７、ドライブ軸１８、プロペラ軸１
９を介して、プロペラ軸１９に固定されているプロペラ
２０に伝達され、プロペラ２０を前進回転もしくは後進
回転可能としている。、Ａ″お、ケーシング１４の内部
には、油室２１が区画形成され、油室２１は潤滑油を収
容し、前後進切換装置１７、ドライブ軸１８、プロペラ
軸１９の前端部のそれぞれを潤滑可能としている。An engine (not shown) is disposed inside the hull 11, and the output of the engine is transmitted through a transmission shaft 16 that constitutes a drive unit.
, forward/reverse switching device 17, drive shaft 18, propeller shaft 1
9 to the propeller 20 fixed to the propeller shaft 19, making the propeller 20 capable of forward rotation or backward rotation. ,A''O, An oil chamber 21 is defined inside the casing 14, and the oil chamber 21 stores lubricating oil and lubricates the front ends of the forward/reverse switching device 17, the drive shaft 18, and the propeller shaft 19, respectively. It is possible.

また、ケーシング１４の内部には、氷室２２が区画形成
され、航走時に水中に位置するケーシング１４の左右両
側面で推進方向の前方を臨む部分には、外水を氷室２２
に導入可能とする流入孔２３が配設されている６また、
航走時に水中に位置するケーシング１４の左右両側面で
推進方向の後方を臨む部分には、航走時に流入孔２３に
作用する水流の動圧によって氷室２２の内部の水を流出
可能とする流出孔２４が配設されている。In addition, an ice chamber 22 is formed in the inside of the casing 14, and outside water is poured into the ice chamber 22 on both left and right side surfaces of the casing 14, which are located in the water during cruising, in the portions facing forward in the propulsion direction.
In addition, an inflow hole 23 is provided to allow the introduction of
On both the left and right sides of the casing 14 located underwater during cruising, in the portions facing the rear in the propulsion direction, there are outflow holes that allow the water inside the ice chamber 22 to flow out by the dynamic pressure of the water flow acting on the inflow hole 23 during cruising. A hole 24 is provided.

次に、上記第１実施例の作用について説明する。Next, the operation of the first embodiment will be explained.

船内外様１０の航走時には、流入孔２３から氷室２２に
流入し、氷室２２から流出孔２４を経て流出する水を、
水流の動圧によって、ケーシング１４の左右両側面で推
進方向の後方を臨む部分に送り込む。従って、操舵ハン
ドル１５に加える転舵操作による船内外機１０の旋回時
に、第３図に示すように、ケーシング１４に対する水の
流れが迎え角αを持つようになり、水の当たらない側の
後方部分の周囲に生ずる負圧を抑制する。これにより、
ケーシング１４の上記後方部分におけるキャビテーショ
ンの発生を防止し、ケーシング１４の大側面によって水
を効率よくカイトし、旋回性を向上可能とする。また、
ケーシング１４の」−記後方部分におけるキャビテーシ
ョンの発生ヲ防止することにより、その後方に位置する
プロペラ２０におけるキャビテーションの発生をも防止
し、プロペラ２０の推力を低下させることなく、これに
よっても旋回性を向上可能とする。When the inboard and outboard member 10 is traveling, water flows into the icehouse 22 through the inflow hole 23 and flows out from the icehouse 22 through the outflow hole 24.
The dynamic pressure of the water flow causes the water to be sent to the portions facing the rear in the propulsion direction on both left and right sides of the casing 14. Therefore, when the inboard/outboard motor 10 turns due to the steering operation applied to the steering handle 15, the water flow toward the casing 14 has an angle of attack α, as shown in FIG. Suppresses the negative pressure that develops around the part. This results in
Cavitation is prevented from occurring in the rear portion of the casing 14, water is efficiently kited by the large side surface of the casing 14, and turning performance can be improved. Also,
By preventing the occurrence of cavitation in the rear portion of the casing 14, cavitation is also prevented from occurring in the propeller 20 located behind it, thereby improving the turning performance without reducing the thrust of the propeller 20. It is possible to improve.

なお、上記流出孔２４は、ケーシング１４の大側面にお
ける負圧発生可能領域の最前方側位置（負圧開始位置）
ないし該負圧発生可能領域の略中央位置の範囲内に設定
するのがよい。Note that the outflow hole 24 is located at the most forward position (negative pressure starting position) of the area where negative pressure can be generated on the large side surface of the casing 14.
It is preferable to set it within the range of approximately the center position of the negative pressure generation possible area.

また、ケーシング１４の大側面における負圧発生状態は
ケーシング１４の各高さ位置での翼形状の相違によって
変化することから、各流出孔２４の配設位置、開口面積
は上記負圧発生状態の変化に適合させる必要がある。従
って、第４図に示すように、ケーシング１４の左右両側
面において、流出孔２４の配設位置を高さ方向にずメう
ずことも考えられる。In addition, since the negative pressure generation state on the large side surface of the casing 14 changes depending on the difference in blade shape at each height position of the casing 14, the arrangement position and opening area of each outlet hole 24 are determined according to the above negative pressure generation state. Need to adapt to change. Therefore, as shown in FIG. 4, it is conceivable that the position of the outflow holes 24 may be shifted in the height direction on both the left and right sides of the casing 14.

第５図は本発明の第２実施例に係るケーシング３０を示
す略示断面図である。このケーシング３０か前記第１実
施例に係るケーシング１４と異なる点は、ケーシング３
０の前方部分に流入孔を設けることなく、ケーシング３
ｏの左右両側面で推進方向の後方を臨む部分に孔３１．
３２を設けたことにある。これによれば、船内外機１０
は一方に転舵する時、一方の孔３１から流入した水を、
ケーシング３０の大側面における負圧発生可能領域に開
口する他方の孔３２から流出し、船内外機１０が他方に
転舵する時、他方の孔３２から流入した水を、ケーシン
グ３０の大側面における負圧発生可能領域に開口する他
方の孔３１がら流出することが可能である。すなわち、
船内外機ｌＯの転舵操作に基づく旋回時に、ケーシング
３０に対する水の流れが迎え角αを持つようになり、水
の当たらない側の後方部分の周囲に生ずることとなる負
圧を抑制し、該部分および後方のプロペラにおけるキャ
ビテーションの発生を防止可能とし、水を効率よくカイ
トするとともに、プロペラの推力低下を抑制し、旋回性
を向上することが可能となる。FIG. 5 is a schematic cross-sectional view showing a casing 30 according to a second embodiment of the present invention. The difference between this casing 30 and the casing 14 according to the first embodiment is that the casing 30 is different from the casing 14 according to the first embodiment.
casing 3 without providing an inflow hole in the front part of 0.
Holes 31.
32 was established. According to this, the inboard/outboard motor 10
When turning to one side, the water flowing in from one hole 31 is
The water flows out from the other hole 32 that opens into the area where negative pressure can be generated on the large side surface of the casing 30, and when the inboard/outboard motor 10 is steered to the other side, the water flowing in from the other hole 32 is drained into the large side surface of the casing 30. It is possible for the liquid to flow out through the other hole 31 which opens into the area where negative pressure can be generated. That is,
When turning based on the steering operation of the inboard/outboard motor IO, the flow of water toward the casing 30 has an angle of attack α, suppressing the negative pressure that would be generated around the rear portion on the side that is not hit by the water, It is possible to prevent the occurrence of cavitation in this part and the rear propeller, and it is possible to efficiently kite water, suppress a decrease in propeller thrust, and improve turning performance.

［発明の効果］ 以上のように、本発明は、ケーシングにドライブユニッ
トを収容してなる船舶推進機の水流調整装置であって、
航走蒔に水中に位置するケーシン、グの左右両側面で推
進方向の後方を臨む部分に、水が流出可能とされる孔を
配設してなるようにしたものである。′従って、ケーシ
ングに対する水の流れが旋回時には迎え角を持つように
なり、水の当たらない側の後方部分の周囲に生ずること
となる負圧を抑制し、該部分におけるキャビテーション
の発生を防止可能とし、水を効率よくガイドし、旋回性
を向」ニすることが可能となる。[Effects of the Invention] As described above, the present invention provides a water flow adjustment device for a marine propulsion device in which a drive unit is housed in a casing,
The casing, which is located in the water, is provided with holes on both left and right sides of the casing, which face the rear in the direction of propulsion, to allow water to flow out. 'Therefore, the flow of water against the casing has an angle of attack when turning, suppressing the negative pressure that would be generated around the rear part on the side where the water does not hit, and making it possible to prevent the occurrence of cavitation in this part. This makes it possible to guide water efficiently and improve turning performance.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明の第１実施例に係る船内外機を示す断面
図、第２図は第１図の要部側面図、第３図は第１図のｍ
−ｍ線に沿う略示断面図、第４図は第２図のＩＶ−ＩＶ
線に沿う部分の変形例を示す断面図、第５図は本発明の
第２実施例に係るケーシングを示す略示断面図である。 １０・・・船内外機、１４．３０・・・ケーシング、１
６・・・伝動軸、１７・・・前後進切換装置、１８・・
・ドライブ軸、１９・・・プロペラ軸、２４．３１．３
２・・・孔。 代理人　弁理士　塩　川　修　治FIG. 1 is a sectional view showing an inboard/outboard motor according to a first embodiment of the present invention, FIG. 2 is a side view of the main part of FIG. 1, and FIG.
- A schematic cross-sectional view taken along line m, FIG. 4 is IV-IV in FIG.
A cross-sectional view showing a modified example of the portion along the line, and FIG. 5 is a schematic cross-sectional view showing a casing according to a second embodiment of the present invention. 10...Inboard/outboard motor, 14.30...Casing, 1
6... Transmission shaft, 17... Forward/forward switching device, 18...
・Drive shaft, 19...Propeller shaft, 24.31.3
2...hole. Agent Patent Attorney Osamu Shiokawa

Claims (1)

【特許請求の範囲】[Claims] （１）ケーシングにドライブユニットを収容してなる船
舶推進機の水流調整装置であって、航走時に水中に位置
するケーシングの左右両側面で推進方向の後方を臨む部
分に、水が流出可能とされる孔を配設してなる船舶推進
機の水流調整装置。(1) A water flow adjustment device for a marine propulsion device in which a drive unit is housed in a casing, which allows water to flow out to the portions facing the rear in the propulsion direction on both left and right sides of the casing that are located underwater during navigation. A water flow adjustment device for marine propulsion equipment that is equipped with holes.