Drive shaft support structure for marine propulsion machine
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B63H-021/38
B63H-021/00
출원번호
US-0824943
(2004-04-15)
우선권정보
JP-2003-114850(2003-04-18)
발명자
/ 주소
Ide,Shinichi
Matsuda,Yoshiyuki
Akiyama,Masahiro
출원인 / 주소
Honda Motor Co., Ltd.
대리인 / 주소
Carrier, Blackman &
인용정보
피인용 횟수 :
6인용 특허 :
7
초록▼
In a drive shaft support structure for a marine propulsion machine, a gear case is provided with a vertical drive shaft receiving, bore and a drive shaft driven by an internal combustion engine is supported for rotation in the drive shaft receiving bore. A gear case is provided with a gear chamber c
In a drive shaft support structure for a marine propulsion machine, a gear case is provided with a vertical drive shaft receiving, bore and a drive shaft driven by an internal combustion engine is supported for rotation in the drive shaft receiving bore. A gear case is provided with a gear chamber connected to the lower end of the drive shaft receiving bore. A bevel gear mechanism for transmitting power from the drive shaft to a propeller shaft is disposed in the gear chamber. The drive shaft is supported for rotation in a bearing. The bearing is fitted in the drive shaft receiving bore and is held fixedly in place with a bearing-fastening member screwed in an internal threaded part of the drive shaft receiving bore. A covering member provided with a central hole through which the drive shaft is passed is attached to the gear case so as to close the open upper end of the drive shaft receiving bore in a liquid-tight fashion. The bearing is held fixedly in the gear case to prevent the vertical movement of the drive shaft.
대표청구항▼
What is claimed is: 1. A drive shaft support structure for a marine propulsion machine having a vertical drive shaft, and a gear case forming a lower part of the marine propulsion machine and provided with a vertical drive shaft receiving bore receiving said drive shaft in a bearing fixedly held in
What is claimed is: 1. A drive shaft support structure for a marine propulsion machine having a vertical drive shaft, and a gear case forming a lower part of the marine propulsion machine and provided with a vertical drive shaft receiving bore receiving said drive shaft in a bearing fixedly held in the drive shaft receiving bore and with a gear chamber connected to a lower end of the drive shaft receiving bore and receiving therein a bevel gear mechanism for transmitting power of a drive shaft to a propeller shaft, said gear chamber storing therein a lubricating oil, said drive shaft support structure comprising: a bearing-fastening member for holding the bearing in the drive shaft receiving bore so that the bearing is substantially vertically fixed in place in the drive shaft receiving bore; and a covering member disposed above the bearing-fastening member, and closing an upper end of the drive shaft receiving bore in a liquid-tight fashion, said covering member having a body part penetrated by the drive shaft and a downwardly projecting part projecting downward from the body part, said downwardly projecting part being closely fitted in said upper end of the drive shaft receiving bore and having an oil passage forming a part of a lubricating oil flow path which extends from said gear chamber through said drive shaft receiving bore to a space between the bearing-fastening member and the covering member and from said space to an outside of the drive shaft receiving bore through a connecting hole for conducting the lubricating oil to the outside. 2. The drive shaft support structure according to claim 1, wherein the gear case is provided in a part of the drive shaft receiving bore with an internal thread, the bearing-fastening member is provided with an external thread capable of mating with the internal thread of the gear case, and the bearing-fastening member is screwed in the internal threaded part of the drive shaft receiving bore to hold the bearing in place in the drive shaft receiving bore. 3. The drive shaft support structure according to claim 2, wherein a part of the drive shaft receiving bore extending below the internal thread is reduced to form a shoulder, wherein the bearing is seated on the shoulder, and wherein the bearing-fastening member is screwed in the part provided with the internal thread of the drive shaft receiving bore so as to press the bearing against the shoulder, in order to hold the bearing between the bearing-fastening member and the shoulder. 4. The drive shaft support structure according to claim 3, wherein a pert of the drive shalt receiving bore between the internal thread and the shoulder is tapered downwardly to form a tapered bearing part, wherein the bearing has a tapered circumference tapering downwardly, and wherein the bearing is held in place in the drive shaft receiving bore with the tapered circumferences thereof in close contact with the tapered surface of the tapered bearing part of the drive shaft receiving bore. 5. The drive shaft support structure according to claim 2, wherein the bearing-fastening member has a ring shape and has a polygonal central hole in which a turning tool engages. 6. The drive shaft support structure according to claim 2, wherein the bearing-fastening member is provided at its lower end with an annular ridge that is pressed against the bearing. 7. The drive shaft support structure according to claim 1, wherein an open upper end of the drive shaft receiving bore is sunk beneath an upper surface of the gear case, the covering member is provided with a flange, and the covering member is positioned with the flange seated on the open upper end of the drive shaft receiving bore. 8. The drive shaft support structure according to claim 7, wherein the covering member has a body part having the shape of a disk, an upper cylindrical part projecting upward from the body part, an inner cylindrical part projecting downward from the body part, and an outer cylindrical part projecting downward from the body part and surrounding the inner cylindrical part, and the outer cylindrical part is fitted in the upper end part of the drive shaft receiving bore. 9. The drive shaft support structure according to claim 7, wherein the body part of the covering member□is provided with a boss, and the boss is attached to the gear case. 10. The drive shaft support structure according to claim 8, wherein a sealing member is held between the inner cylindrical part and the drive shall, and an O-ring is held between the outer cylindrical part and a side surface of the drive shall receiving bore. 11. The drive shaft support structure according to claim 1, wherein a space is formed between the covering member and the bearing-fastening member in the drive shaft receiving bore, and the space is connected through a connecting hole to a lubricant supply source. 12. The drive shaft support structure according to claim 1, wherein an under panel having an opening through which the drive shaft is passed is disposed on the upper surface of the gear case so as to extend across the drive shaft receiving bore, and a water pump driven by the drive shaft is mounted on the under panel. 13. The drive shaft support structure of claim 1, wherein the bearing-fastening member comprises a bearing fastening ring having an outside circumference provided with an external thread, a molded inside surface for receiving a working end of a tool, and a downwardly extending annular skirt. 14. A drive shaft support structure for a marine propulsion machine comprising a vertical drive shaft and a gear case forming a lower part of the marine propulsion machine and provided with a vertical drive shaft receiving bore containing a bearing, and a gear chamber connected to a lower end of the drive shaft receiving bore for receiving a bevel gear mechanism for transmitting power of the drive shaft to a propeller shaft, said drive shaft being supported in the drive shaft receiving bore for rotation in a bearing, said drive shaft support structure comprising a bearing-fastening member for holding the bearing in place in the drive shaft receiving bore; and a covering member disposed above the bearing-fastening member and closing an upper end of the drive shaft receiving bore in a liquid-tight fashion, said covering member having a body part penetrated by the drive shaft and a downwardly projecting part projecting downward from the body part, said downwardly projecting part being closely fitted in said upper end of the drive shaft receiving bore and having an oil passage forming a part of a lubricating oil flow path which extends from said gear chamber through said drive shall receiving bore to a space between the bearing-fastening member and the covering member and from said space to an outside of the drive shall receiving bore through a connecting hole for conducting the lubricating oil to the outside. 15. The drive shaft support structure of claim 14, wherein the bearing-fastening member comprises, a molded inside surface for receiving a working end of a tool, and a downwardly extending annular skirt. 16. The drive shaft support structure of claim 14, further comprising a covering seal member disposed above the bearing-fastening member, and closing an upper end of the drive shaft receiving bore in a liquid-tight fashion; wherein said covering seal member has a hollow bore formed therein to receive the drive shaft therethrough.
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이 특허에 인용된 특허 (7)
Onoue Akihiro (Hamamatsu JPX), Device for supporting drive shaft of marine propulsion unit.
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