US3865510A - Marine propeller - Google Patents

Marine propeller Download PDF

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Publication number
US3865510A
US3865510A US418023A US41802373A US3865510A US 3865510 A US3865510 A US 3865510A US 418023 A US418023 A US 418023A US 41802373 A US41802373 A US 41802373A US 3865510 A US3865510 A US 3865510A
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United States
Prior art keywords
outer cylinders
resilient means
cylinder
gap
marine propeller
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 - Lifetime
Application number
US418023A
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English (en)
Inventor
Takao Yoshino
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.)
Komatsu Ltd
Original Assignee
Komatsu 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 Komatsu Ltd filed Critical Komatsu Ltd
Application granted granted Critical
Publication of US3865510A publication Critical patent/US3865510A/en
Anticipated expiration legal-status Critical
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    • 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

Definitions

  • ABSTRACT MW 29, J an 47/113338 A marine propeller which has a boss having inner and outer cylinders coaxially disposed with each other in such a manner that at least one opposing surface of [2?] 4l6/l3 g64lh6/l69 the inner and outer Cylinders is obliquely formed in 3 trough shape of wedge yp and the other pp g 1 1e 0 earc l69 surface thereof is obliquely formed correspondingly in crest shape of wedge type, and a resilient member dis- [56] References C'ted posed in the gap between the oblique opposing sur- UNITED STATES PATENTS faces of the inner and outer cylinders so as to inte- 2,097,3l8 10/1937 Dowell 416/134 grate both the cylinders.
  • This invention relates to a marine propeller having a resilient member disposed between the inner and outer cylinders of its boss, and more particularly to improvements of the marine propeller which prevents the outer cylinder of the boss bearing the propulsion force of the propeller from pulling out of the inner cylinder fixed to the drive shaft of the propeller.
  • some of the conventional marine propeller, particularly the propeller for compact vessel has a resilient member such as rubber disposed between the inner cylinder of the boss fixed to the drive shaft of the propeller and the outer cylinder of the boss including blades formed therearound so as to prevent the blades from being damaged by reducing the shock with the resilient member in case where one of the blades collides with an obstacle.
  • a resilient member such as rubber disposed between the inner cylinder of the boss fixed to the drive shaft of the propeller and the outer cylinder of the boss including blades formed therearound so as to prevent the blades from being damaged by reducing the shock with the resilient member in case where one of the blades collides with an obstacle.
  • an object of the present invention to provide a marine propeller which eliminates the aforementioned disadvantages of the conventional propeller and prevents the outer cylinder of the boss thereof from being pulled out of the inner cylinder of the boss even if the reaction of the propulsion force is applied with shock to the blade together with the outer cylinder of the boss.
  • one preferred embodiment of the marine propeller of the invention comprises a boss having inner and outer cylinders coaxially disposed with each other in such a manner that at least one opposing surface of the inner and outer cylinders is obliquely formed in trough shape of wedge type and the other opposing surface thereof is obliquely formed correspondingly in crest shape of wedge type, and a resilient member disposed in the gap between the oblique opposing surfaces of the inner and outer cylinders so as to prevent the outer cylinder of the boss from being pulled out of the inner cylinder of the boss by the wedging action of the oblique opposing surfaces of the inner and outer cylinders of the boss.
  • FIG. I is a longitudinal sectional view of the essential part of the propeller of the present invention.
  • FIG. 2 is a sectional view of the propeller taken along the line ll-II in FIG. 1;
  • FIG. 3 is a view showing the method of inserting the resilient member into the boss of the propeller of the present invention.
  • numeral 1 represents a boss of the propeller of the present invention, which is formed of an inner cylinder 3 having an engaging hole 2 for a drive shaft (not shown) at the center thereof and an outer cylinder 5 including blades 4 formed therearound.
  • the outer peripheral surface of the inner cylinder 3 is formed continuously in trough shape oblique surface 6 having different oblique surfaces 60 and 6b bent at the center thereof.
  • the inner peripheral surface of the outer cylinder 5 is formed continuously in crest shape oblique surface 7 having different oblique surfaces 7a and 7b bent at the center thereof in such a manner that when the inner cylinder 3 is coaxially inserted into the outer cylinder 4, a gap 8 of the same interval is formed between the oblique surfaces 6 and 7 of the inner and outer cylinders, respectively.
  • a resilient member 9 such as rubber is inserted in the gap 8 between the inner and outer cylinders 3 and 5 so as to integrate the inner and outer cylinders 3 and 5.
  • the method of inserting the resil ient member 9 between the inner and outer cylinders 3 and 5 comprises coaxially fixing the inner and outer cylinders 3 and 5 on a station 10, and press-fitting the resilient member 9 formed in annular shape in advance into the gap 8 formed between the inner and outer cylinders 3 and 5 by a pressing means 11 so as to integrate the inner and outer cylinders 3 and 5.
  • Another method of inserting the resilient member 9 between the inner and outer cylinders 3 and 5 may comprise pouring, molten liquid resilient member into the gap 8 between the inner and outer cylinders 3 and 5 so as to integrate the outer and inner cylinders 3 and 5..
  • the outer peripheral surface of the inner cylinder 3 is formed in trough shape and the inner peripheral surface of the outer cylinder 5 is formed in crest shape in the above embodiment, it will also be appreciated by those skilled in the art that the oblique trough shape surface 6 of the inner cylinder 3 may be oppositely formed in crest shape and the oblique crest shape surface 7 of the outer cylinder 5 may be oppositely formed in trough shape so as to provide the same effect as that in the previous embodiment.
  • the marine propeller of the present invention comprises a boss 1 which is formed of an inner cylinder 3 and an outer cylinder 5 including blades 4 formed therearound in such a manner that the outer peripheral surface of the inner cylinder 3 is formed in trough or crest shape oblique surface and the inner peripheral surface of the outer cylinder 5 is formed in crest or trough oblique surface, and a resilient member disposed in the gap 8 formed between the oblique surfaces 6 and 7, respectively, even if the outer cylinder 5 is applied with the reaction of the propulsion force with respect to the inner cylinder 3 fixed to the drive shaft, the outer cylinder 5 is prevented from being pulled out of the inner cylinder 3 by the wedging action of the resilient member 9 disposed between the oblique surfaces 6 and 7 and also by both oblique surfaces 6 and 7, and even if shocking reaction of the propulsion force is applied to the outer cylinder 5 by the sudden torque change, the outer cylinder 5 may be prevented from being pulled out of the inner cylinder 3.
  • a marine propeller comprising a. an inner cylinder having an engaging hole in the center thereof for engaging a drive shaft, the outer surface of said inner cylinder having a circumferential trough formed therein;
  • a hollow outer cylinder having a plurality of blades projecting from the outer periphery thereof, the inner surface of said outer cylinder having a circumferential crest formed thereon, said crest corresponding to said trough, said inner and outer cylinders being aligned coaxially and spaced apart such that a gap is formed between said inner and outer cylinders and there is no direct contact between said inner and outer cylinders along the coaxially aligned surfaces;
  • resilient means disposed in said gap, said resilient means contacting said inner and outer cylinders along the total length of said gap, said resilient means absorbing the shock generated by said propellers and operably engaging said crest and trough to prevent the separation of said inner and outer cylinders.
  • a marine propeller comprising .a. an inner cylinder having an engaging hole in the -b. a hollow outer cylinder having a plurality of blades projecting from the outer periphery thereof, the inner surface of said outer cylinder having a circumferential trough formed therein, said trough corresponding to said crest, said inner and outer cylinders being aligned coaxially and spaced apart such that a gap is formed between said inner and outer cylinders and there is no direct contact between said inner and outer cylinders along the coaxially aligned surfaces; and
  • resilient means disposed in said gap, said resilient means contacting said inner and outer cylinders along the total length of said gap, said resilient means absorbing the shock generated by said propellers and operably engaging said crest and trough to prevent the separation of said inner and outer cylinders.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Vibration Dampers (AREA)
US418023A 1972-11-29 1973-11-21 Marine propeller Expired - Lifetime US3865510A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP47118888A JPS4977390A (cs) 1972-11-29 1972-11-29

Publications (1)

Publication Number Publication Date
US3865510A true US3865510A (en) 1975-02-11

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Application Number Title Priority Date Filing Date
US418023A Expired - Lifetime US3865510A (en) 1972-11-29 1973-11-21 Marine propeller

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US (1) US3865510A (cs)
JP (1) JPS4977390A (cs)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2393722A1 (fr) * 1977-06-09 1979-01-05 Volvo Penta Ab Moyeu d'helice de bateau
US4575310A (en) * 1983-03-17 1986-03-11 Sanshin Kogyo Kabushiki Kaisha Propeller shock absorber for marine propulsion device
US6309181B1 (en) * 1999-03-11 2001-10-30 Emu Unterwasserpumpen Gmbh Fluid flow machine wheel and uses thereof

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2097318A (en) * 1935-04-26 1937-10-26 Gen Electric Fan
US2235605A (en) * 1937-03-10 1941-03-18 Bugatti Ettore Screw propeller
US2354101A (en) * 1942-08-07 1944-07-18 United Aircraft Corp Fan construction
US2469116A (en) * 1945-12-31 1949-05-03 Elmer C Kiekhaefer Propeller mounting
US2802353A (en) * 1952-07-25 1957-08-13 Thomas H Peirce Fan drive insulator assembly
US3279415A (en) * 1965-02-25 1966-10-18 Kiekhaefer Corp Marine propeller for discharging engine exhaust through the propeller hub
US3744931A (en) * 1971-07-26 1973-07-10 Logic Syst Corp Ltd Brine resistant propeller

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2097318A (en) * 1935-04-26 1937-10-26 Gen Electric Fan
US2235605A (en) * 1937-03-10 1941-03-18 Bugatti Ettore Screw propeller
US2354101A (en) * 1942-08-07 1944-07-18 United Aircraft Corp Fan construction
US2469116A (en) * 1945-12-31 1949-05-03 Elmer C Kiekhaefer Propeller mounting
US2802353A (en) * 1952-07-25 1957-08-13 Thomas H Peirce Fan drive insulator assembly
US3279415A (en) * 1965-02-25 1966-10-18 Kiekhaefer Corp Marine propeller for discharging engine exhaust through the propeller hub
US3744931A (en) * 1971-07-26 1973-07-10 Logic Syst Corp Ltd Brine resistant propeller

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2393722A1 (fr) * 1977-06-09 1979-01-05 Volvo Penta Ab Moyeu d'helice de bateau
US4575310A (en) * 1983-03-17 1986-03-11 Sanshin Kogyo Kabushiki Kaisha Propeller shock absorber for marine propulsion device
US6309181B1 (en) * 1999-03-11 2001-10-30 Emu Unterwasserpumpen Gmbh Fluid flow machine wheel and uses thereof

Also Published As

Publication number Publication date
JPS4977390A (cs) 1974-07-25

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