JPS6335027Y2 - - Google Patents
Info
- Publication number
- JPS6335027Y2 JPS6335027Y2 JP6083983U JP6083983U JPS6335027Y2 JP S6335027 Y2 JPS6335027 Y2 JP S6335027Y2 JP 6083983 U JP6083983 U JP 6083983U JP 6083983 U JP6083983 U JP 6083983U JP S6335027 Y2 JPS6335027 Y2 JP S6335027Y2
- Authority
- JP
- Japan
- Prior art keywords
- propeller
- duct
- groove
- filled
- tip
- 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
Links
- 230000002093 peripheral effect Effects 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 2
- 240000007182 Ochroma pyramidale Species 0.000 description 1
- 239000011358 absorbing material Substances 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Description
【考案の詳細な説明】
本考案はプロペラの損傷を防止するプロペラ・
ダクトに関するものである。[Detailed description of the invention] This invention is a propeller that prevents damage to the propeller.
It concerns ducts.
例えば、ホバークラフト用に使用されるプロペ
ラ・ダクトは軽量が要求されるため結果的に剛性
を十分とれない場合が多い。 For example, propeller ducts used for hovercraft are required to be lightweight, and as a result, they often do not have sufficient rigidity.
他方、プロペラの効率を向上させるためにプロ
ペラの先端部とダクト内壁面との間隔ａはａ≦
0.005Dであることが必要条件である。ここで、
Ｄはプロペラの直径である。 On the other hand, in order to improve the efficiency of the propeller, the distance a between the tip of the propeller and the inner wall surface of the duct is set such that a≦
The required condition is 0.005D. here,
D is the diameter of the propeller.
したがつて、プロペラ径を2700mmとすると、ａ
は13mm以下にしなければならないが、この値はプ
ロペラ・ダクトの製作公差、或いは外力によるダ
クトの変形等を考え合わせると非常に厳しい要求
である。 Therefore, if the propeller diameter is 2700mm, a
must be 13 mm or less, but this value is a very strict requirement considering manufacturing tolerances of the propeller duct, deformation of the duct due to external forces, etc.
若し、何らかの原因でダクトが予想以上に変形
したときにプロペラとダクトとが接触して相方が
損傷することになる。 If the duct deforms more than expected for some reason, the propeller and duct will come into contact and damage the other.
本考案は、かかる損傷、特に、プロペラの損傷
を防止するために考案したものである。 The present invention was devised to prevent such damage, particularly damage to the propeller.
即ち、本考案のプロペラ・ダクトはプロペラの
先端部に対応するダクト内周面に溝部を設け、該
溝部にプロペラより軟質の部材を充填したことを
特徴とする。 That is, the propeller duct of the present invention is characterized in that a groove is provided on the inner peripheral surface of the duct corresponding to the tip of the propeller, and the groove is filled with a member softer than the propeller.
以下、本考案の実施例を図面によつて説明す
る。 Embodiments of the present invention will be described below with reference to the drawings.
第１図は本考案に係るプロペラ及びダクトの組
立断面図、第２図は、その拡大図でルる。 FIG. 1 is an assembled sectional view of the propeller and duct according to the present invention, and FIG. 2 is an enlarged view thereof.
図に於て、プロペラ・ダクト１はプロペラ２と
ダクト本体３とから形成されている。このダクト
３は軽量化のために薄板の中空状となつている。
プロペラ２の先端部２ａに対応するダクト３の内
周面に溝部４を設け、この溝部４内に発泡剤、或
いはバルサ材等のプロペラ２より極度に軟質の部
材５を充填している。尚、充填部材５の表面はダ
クト３の内面３ａの段差のないように平滑に仕上
げることは言う迄もない。 In the figure, a propeller duct 1 is formed from a propeller 2 and a duct body 3. This duct 3 is made of a hollow thin plate in order to reduce its weight.
A groove 4 is provided on the inner peripheral surface of the duct 3 corresponding to the tip 2a of the propeller 2, and the groove 4 is filled with a member 5 that is extremely softer than the propeller 2, such as a foaming agent or balsa wood. It goes without saying that the surface of the filling member 5 is finished to be smooth so that there are no steps on the inner surface 3a of the duct 3.
また、吸音材を充填すると騒音低下にも役立つ
ので好都合である。 It is also advantageous to fill with sound absorbing material because it helps reduce noise.
上記のように、本考案はプロペラの先端部に対
応するダクト内周面に溝部を設け、該溝部にプロ
ペラより軟質の部材を充填したから仮に、ダクト
自体が多少変形したとしてもプロペラはダクトの
溝部に充填した部材と接触し、プロペラ自体は損
傷することがない。 As mentioned above, in this invention, a groove is provided on the inner peripheral surface of the duct corresponding to the tip of the propeller, and the groove is filled with a material that is softer than the propeller, so even if the duct itself is slightly deformed, the propeller will still be The propeller itself will not be damaged due to contact with the member filled in the groove.
プロペラによつて損傷された充填部材は再度充
填すれば良い。 Filling members damaged by the propeller can be filled again.
第１図は本考案に係るプロペラ・ダクトの断面
図、第２図は、その拡大図である。
１……プロペラ・ダクト、２……プロペラ、３
……ダクト、４……溝部、５……軟質の部材。
FIG. 1 is a sectional view of a propeller duct according to the present invention, and FIG. 2 is an enlarged view thereof. 1...Propeller duct, 2...Propeller, 3
...Duct, 4...Groove, 5...Soft member.
Claims (1)
端部に対応するダクト内周面に溝部を設け、該溝
部にプロペラより極度に軟質の部材を充填したプ
ロペラ・ダクト。 A propeller/duct consisting of a propeller and a duct, with a groove provided on the inner peripheral surface of the duct corresponding to the tip of the propeller, and the groove filled with a material that is extremely softer than the propeller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6083983U JPS59167058U (en) | 1983-04-25 | 1983-04-25 | propeller duct |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6083983U JPS59167058U (en) | 1983-04-25 | 1983-04-25 | propeller duct |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59167058U JPS59167058U (en) | 1984-11-08 |
| JPS6335027Y2 true JPS6335027Y2 (en) | 1988-09-16 |
Family
ID=30191072
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6083983U Granted JPS59167058U (en) | 1983-04-25 | 1983-04-25 | propeller duct |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59167058U (en) |
-
1983
- 1983-04-25 JP JP6083983U patent/JPS59167058U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59167058U (en) | 1984-11-08 |
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