Fluid reaction surfaces (i.e. – impellers) – Plural impellers having relative movement or independent... – Coaxial rotation
Patent
1998-08-10
2000-05-02
Ryznic, John E.
Fluid reaction surfaces (i.e., impellers)
Plural impellers having relative movement or independent...
Coaxial rotation
416174, 384100, B63H 510, F01D 124
Patent
active
060565098
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a contra-rotating bearing device for a contra-rotating propeller wherein a sufficient oil film is formed on the bearing surface of a contra-rotating bearing which supports the inner shaft of the contra-rotating propeller so that an excellent bearing function can be obtained, more specifically to a contra-rotating bearing device for a contra-rotating propeller which can display the bearing function of a contra-rotating bearing when an inner shaft and an outer shaft rotate in mutually opposite directions at almost equal speeds, and more particularly to a contra-rotating bearing device for a contra-rotating propeller which is suitable for a contra-rotating bearing device for a large-sized contra-rotating propeller of a ship or the like.
BACKGROUND ART
Conventionally, a contra-rotating propeller has been known in which an outer shaft having a front propeller and an inner shaft fitted in the outer shaft and having a rear propeller are caused to rotate in mutually opposite directions in order to effectively utilize propeller propulsion energy. Recently, the contra-rotating propeller has been employed in order to enhance the propulsion efficiency of a ship propulsion system.
For example, FIG. 28 is a partial broken side view showing a contra-rotating propeller according to the prior art, and FIG. 29 is a sectional view taken along the line E--E shown in FIG. 28. A contra-rotating propeller 100 includes a hollow outer shaft 102 having a front propeller 101, an inner shaft 104 provided in the outer shaft 102 and having a rear propeller 103, and a main engine 105 for causing the outer shaft 102 and the inner shaft 104 to rotate in mutually opposite directions. The outer shaft 102 has a cylindrical shape, and is rotatably provided on a stern portion 106 of a hull Y through an outer shaft bearing 107 and an outer shaft seal 108. The inner shaft 104 is provided inside the outer shaft 102 through a contra-rotating bearing 109 and an inner shaft seal 110 so as to rotate in the opposite direction. The hull Y is provided with a lubrication oil supply system 111 for supplying lubrication oil to the outer shaft 102, the inner shaft 104, the outer shaft bearing 107 and the contra-rotating bearing 109. A rudder horn 112 and a rudder plate 113 are opposed to the front propeller 101 and the rear propeller 103.
In the contra-rotating propeller 100 having such a structure, an ordinary journal bearing mechanism can be employed as the outer shaft bearing 107 provided between the outer shaft 102 and the stern portion 106. In the contra-rotating bearing 109 which supports the inner shaft 104 that rotates in the outer shaft 102 in the opposite direction, particularly as shown in FIG. 29, however, in the case where the inner shaft 104 rotates clockwise and the contra-rotating bearing 109 such as a plain bearing which is fixed to the outer shaft 102 and the inner peripheral face thereof rotates counterclockwise, there is a possibility that lubrication oil cannot form an oil film between the outer peripheral face of the inner shaft 104 and the inner peripheral face of the contra-rotating bearing 109 if the outer shaft 102 and the inner shaft 104 rotate at almost equal speeds. For this reason, it becomes hard for the shafts 102 and 104 to perform hydrodynamic lubrication due to the oil film formation by the lubrication oil supplied from the lubrication oil supply system 111 when the inner shaft 104 and the outer shaft 102 rotate in mutually opposite directions at almost equal speeds as shown in a sectional view of FIG. 30 in which the contra-rotating bearing 109 is provided on the inner peripheral face of the outer shaft. Thus, there is a possibility that the ordinary bearing cannot display the bearing function.
For this reason, in some bearings, a floating bush 114 is provided between the outer shaft 102 and the inner shaft 104 as shown in a sectional view of FIG. 31. And, the floating bush 114 is almost kept stationary between both shafts 102 and 104 so that an oil film is formed betwe
REFERENCES:
patent: 2348274 (1944-05-01), Aker
patent: 2348275 (1944-05-01), Aker
patent: 2457999 (1949-01-01), Hulbert
patent: 2470560 (1949-05-01), Hoover
patent: 3167361 (1965-01-01), Snapp et al.
patent: 3317254 (1967-05-01), Satterthwaite et al.
patent: 3466952 (1969-09-01), Greenberg et al.
patent: 3515449 (1970-06-01), Harbage, Jr.
patent: 3637273 (1972-01-01), Orndorff, Jr.
patent: 3889626 (1975-06-01), Kakihara
patent: 3971606 (1976-07-01), Nakano et al.
patent: 4295690 (1981-10-01), Rutz
patent: 4307918 (1981-12-01), Mohsin
patent: 4366993 (1983-01-01), Ono et al.
patent: 4514099 (1985-04-01), John et al.
patent: 4558960 (1985-12-01), Lehtinen et al.
patent: 4602873 (1986-07-01), Izumi et al.
patent: 4786264 (1988-11-01), Asanabe et al.
patent: 4798480 (1989-01-01), Van Beek
patent: 4828518 (1989-05-01), Kouda et al.
patent: 4834559 (1989-05-01), Kalvoda
patent: 4883367 (1989-11-01), Maruyama
patent: 5017023 (1991-05-01), Scharrer et al.
patent: 5143455 (1992-09-01), Squyres
patent: 5169242 (1992-12-01), Blase et al.
patent: 5374208 (1994-12-01), Von Bergen et al.
patent: 5415476 (1995-05-01), Onishi
patent: 5419724 (1995-05-01), Wyland et al.
patent: 5456535 (1995-10-01), Chen et al.
patent: 5746515 (1998-05-01), Takahashi et al.
patent: 5772334 (1998-06-01), Parkins et al.
patent: 5795198 (1998-08-01), Pedone
Ashida Satoshi
Keirimbo Satoshi
Matsuda Masayasu
Nakayama Mikihiko
Nitta Keiichi
Kawasaki Jukogyo Kabushiki Kaisha
Ryznic John E.
LandOfFree
Contra-rotating bearing device for contra-rotating propeller does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Contra-rotating bearing device for contra-rotating propeller, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Contra-rotating bearing device for contra-rotating propeller will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1589610