JP2002293292A - Outboard engine - Google Patents

Outboard engine

Info

Publication number
JP2002293292A
JP2002293292A JP2001100650A JP2001100650A JP2002293292A JP 2002293292 A JP2002293292 A JP 2002293292A JP 2001100650 A JP2001100650 A JP 2001100650A JP 2001100650 A JP2001100650 A JP 2001100650A JP 2002293292 A JP2002293292 A JP 2002293292A
Authority
JP
Japan
Prior art keywords
seal member
upper
lower
oil pump
oil
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.)
Pending
Application number
JP2001100650A
Other languages
Japanese (ja)
Inventor
Suehiro Nozue
季宏 野末
Original Assignee
Sanshin Ind Co Ltd
三信工業株式会社
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 Sanshin Ind Co Ltd, 三信工業株式会社 filed Critical Sanshin Ind Co Ltd
Priority to JP2001100650A priority Critical patent/JP2002293292A/en
Priority claimed from US10/066,507 external-priority patent/US6626714B2/en
Publication of JP2002293292A publication Critical patent/JP2002293292A/en
Pending legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B61/00Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing
    • F02B61/04Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving propellers
    • F02B61/045Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving propellers for outboard marine engines

Abstract

(57) [Summary] [PROBLEMS] To extend the replacement time of a seal member for sealing a shaft penetration portion of an oil pump while reducing manufacturing costs. SOLUTION: An upper seal member 35, a lower seal member 36, and an intermediate seal member 37 are provided in a housing of an oil pump 25. The upper seal member 35 seals between the lower end of the crankshaft 14 and the housing. The intermediate seal member 37 and the lower seal member 36 seal between the drive shaft 22 and the housing. The upper seal member 35 and the intermediate seal member 37 prevent the lubricating oil from leaking from above to below. The lower seal member 36 prevents water from penetrating upward from below.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outboard motor in which an oil pump is provided at a lower end of an engine and connected to a crankshaft.

[0002]

2. Description of the Related Art A conventional outboard motor of this type is disclosed, for example, in Japanese Patent No. 3094492.
The outboard motor disclosed in this publication has a lower end of a crankshaft protruding downward from an engine body, and an oil pump connected to an outer peripheral portion of the protruding end. This oil pump uses a trochoid type oil pump, in which an inner gear is connected to a crankshaft, is incorporated in a pump housing, and is attached to an engine body from below.

At the protruding end of the crankshaft, a spline fitting is press-fitted into a shaft center portion, and a drive shaft is spline-fitted from below through the spline fitting. An upper seal member is interposed between the pump housing and an outer peripheral surface of a portion of the spline fitting protruding below the crankshaft.

A seal housing for covering the upper seal member from below is mounted on the pump housing, and a lower seal member is interposed between the seal housing and the drive shaft. That is, in this conventional outboard motor, the upper seal member and the lower seal member seal the shaft through portion of the oil pump. As these seal members, those which press the lip against the outer peripheral surface of the spline fitting or the drive shaft and make sliding contact therewith are used.

In the conventional outboard motor configured as described above, if the outboard motor is used for a long time, oil may leak from the shaft penetration of the oil pump or water may enter the oil pump from inside the cowling. There is.
This occurs because the lips of the upper seal member and the lower seal member are worn, fatigued, or deteriorated by long-term use.

When oil leaks downward from the oil pump, the oil adheres to the damper rubber of the mount member disposed near the lower end of the engine, and the damper rubber deteriorates. Further, when water enters the oil pump, the oil and water are mixed, so-called emulsification occurs, and the oil deteriorates. Conventionally, in order to prevent such a problem from occurring, the upper oil seal and the lower seal member are replaced with new ones at the time of periodic inspection or the like.

[0007]

SUMMARY OF THE INVENTION The inventors of the present invention have extended the period during which a shaft penetrating portion of an oil pump can be sealed by a seal member, and extend the replacement time of the seal member to reduce the economic burden on the user. Are thinking. However, in order to realize this, it is necessary to form the peripheral surface with which the lip slides with even higher precision, and to use a highly durable and expensive seal member. Is increased.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an outboard motor in which the replacement time of a seal member for sealing a shaft penetrating portion of an oil pump is long while reducing manufacturing costs. The purpose is to provide.

[0009]

In order to achieve the above object, an outboard motor according to the present invention comprises an oil pump housing, an upper seal member for sealing between a lower end of a crankshaft, and an upper seal member. A lower seal member that seals between the lower end and the upper end of the drive shaft that is spline-fitted, and an intermediate seal member that is located between these upper and lower seal members and seals between the drive shaft and The upper seal member and the intermediate seal member prevent lubricating oil from leaking from above to below, and the lower seal member prevents water from entering from below to above. .

According to the present invention, oil can be prevented from leaking from the oil pump by the upper seal member and the intermediate seal member, and water can be prevented from entering the oil pump by the lower seal member. In addition, even if a seal failure occurs in all the seal members, the intermediate seal member located in the middle of the oil leakage path and the water intrusion path functions as a weir. It is possible to reduce the amount of oil leakage and the amount of water entering.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of an outboard motor according to the present invention will be described below in detail with reference to FIGS. FIG. 1 is a side view of an outboard motor according to the present invention, FIG. 2 is a sectional view of an oil pump portion of an engine, and FIG. 3 is an enlarged sectional view showing a main part. In these figures, what is indicated by reference numeral 1 is an outboard motor according to this embodiment. 2 denotes an upper casing of the outboard motor 1, 3 denotes a lower casing, 4 denotes a propeller, 5 denotes a tilt mechanism, 6 denotes an upper cowling, 7 denotes a lower cowling, and 8 denotes a hull.

The upper casing 2 has an engine 11 mounted on its upper end via a guide exhaust 2a. This engine 11 is a V-type DOHC 6-cylinder engine. A crankshaft 14 (see FIG. 2) is supported by a cylinder body 12 and a crankcase 13 so that an axial direction thereof is directed in a vertical direction. It is mounted in a state where it is released toward the rear of the outboard motor.
The cylinder head 15 for each bank of the engine 11 is
An intake device 16 extending to the front side of the outboard motor on the side of the engine is connected.

As shown in FIG. 2, the lower end of the crankshaft 14 passes through the bottom wall 21a of the engine body 21 (the cylinder body 12 and the crankcase 13), and the drive shaft 22 is spline-fitted. I have. The spline fitting portion is indicated by reference numeral 23. As the drive shaft 22 rotates, the propeller 4 rotates. The spline fitting portion 23 fits the upper end of the drive shaft 22 from below into a fitting hole 24 formed in the axial center of the lower end of the crankshaft 14. An inner gear 25a of an oil pump 25 described below is connected to an outer peripheral portion of the lower end of the crankshaft 14.

The oil pump 25 is for sucking oil from an oil pan (not shown) and supplying the oil to each lubricated portion of the engine 11, and is of a conventionally well-known trochoid type. FIG. 2 omits the detailed internal structure of the oil pump 25. FIG.
Reference numeral 26 located below the oil pump 25 denotes a mount member for connecting the guide exhaust 2a to the tilt mechanism 5 together with the upper casing 2, the engine 11, and the like. This mounting member 26
Attaches a damper rubber (not shown) to the recess 27,
The guide exhaust 2a is elastically supported by the damper rubber. The damper rubber is provided on both sides of the drive shaft 22.

In the oil pump 25, the inner gear 25a and other components are accommodated in an upper housing 28 and a lower housing 29, and the upper and lower housings 28, 29 are fixed by bolts (not shown). By fixing to the engine body 21, the engine 11
It is attached to. The upper housing 28 includes a disk 28a that contacts the lower surface of the engine body 21 and a disk 2a.
8a is formed integrally with a cylinder 28b projecting upward from the upper surface 8a and covering the periphery of the crankshaft 14.
0 and the discharge port 31 are formed. The cylinder 28b
Foreign matter such as dust in the crank chamber 32 travels along the crank shaft 14 between the oil pump 2 and the oil pump 2.
A crank chamber side seal member 33 is interposed to prevent the water from flowing down to the fifth side.

The lower housing 29 is formed in a cylindrical shape with a bottom opening upward and has an upper end connected to the upper housing 28. Also, this lower housing 2
9 is a shaft sealing portion 3 that projects downward at the center of the bottom.
4 are integrally formed, and the shaft sealing portion 34 is provided with the drive shaft 2.
2 and three seal members to be described later are attached.

These three seal members are used for the crankshaft 1
4 and an upper seal member 35 for sealing between the lower end of the drive shaft 22 and the shaft seal 34, and the upper end of the drive shaft 22 and the shaft seal 34.
And a lower seal member 36 for sealing between the drive shaft 22 and the upper and lower seal members 35 and 36.
And an intermediate sealing member 37 for sealing between the shaft sealing portion 34 and the shaft sealing portion 34.

As shown in FIG. 3, the upper seal member 35 has a lip 35 on its outer peripheral surface near the lower end of the crankshaft 14.
a is in sliding contact. In FIG. 3, the shapes of the seal members 35 to 37 in an initial state (a state in which the crankshaft 14 and the drive shaft 22 are removed) are drawn so as to be understood. The upper seal member 35 is used to prevent the lubricating oil from leaking from above to below.

The intermediate seal member 37 includes a crankshaft 1
The lip 37a is disposed near the lower end surface 14a of the drive shaft 4 and is in sliding contact with the drive shaft 22. This intermediate sealing member 37
Also used is one that prevents the leakage of lubricating oil from above to below. The lower seal member 36 is arranged side by side in contact with the intermediate seal member 37, and the lip 36a is slidably in contact with the drive shaft 22. This intermediate sealing member 37
Uses a device that prevents water from entering from below to above.

By sealing the shaft through portion of the oil pump 25 using the three seal members in this manner, the upper seal member 35 and the intermediate seal member 37 prevent the oil from leaking downward from the oil pump 25. The lower seal member 36 can prevent water from entering the oil pump 25 from below.

For example, when the lip of the upper seal member 35 is worn and oil leaks downward from the lip,
This oil is blocked by an intermediate seal member 37 located below the upper seal member 35. The intermediate seal member 37 is located below the spline fitting portion 23, and the oil stopped flowing downward by the intermediate seal member 37 flows into a gap formed in the spline fitting portion 23. That is, the spline fitting portion 2
Oil can be stored in the gap 3 to prevent leakage downward.

The amount of oil leaking due to the sealing failure of the upper seal member 35 is extremely small. can do.
Note that grease is applied to the spline fitting portion 23 at the time of assembly, and this grease may melt and flow down due to heat during operation of the engine. By providing, it is possible to prevent the molten grease from leaking. Further, even when the lower seal member 36 causes a sealing failure and the water scattered in the cowling passes through the lower seal member 36 and penetrates upward, the intermediate seal member 37 blocks the water intrusion path, Water can be prevented from entering above the seal member 37.

The intermediate seal member 37 is provided with the upper seal member 3.
5 and the lower seal member 36, and as long as these two seal members 35 and 36 do not cause sealing failure and oil leakage or water intrusion occurs, there is little change in the use environment. That is, as compared with the upper seal member 35 whose use environment always changes by being exposed to the oil in the oil pump 25 and the lower seal member 36 whose use environment always changes by coming into contact with water splashed in the cowling, The intermediate sealing member 37 is less likely to cause sealing failure.

For this reason, even when the upper seal member 35 and the lower seal member 36 have a poor seal, the intermediate seal member 37 has a high sealing property, so that oil leakage and Water can be prevented from entering by the intermediate sealing member 37. Therefore, according to this outboard motor, the sealing performance at the shaft penetration portion of the oil pump 25 can be improved only by adding the intermediate sealing member 37 as compared with the conventional case.

[0025]

As described above, according to the present invention, oil can be prevented from leaking from the oil pump by the upper seal member and the intermediate seal member, and water can be prevented from entering the oil pump by the lower seal member. Can be blocked. Also, even if all the seal members have a bad seal, the intermediate seal member located in the middle of the oil leakage path and the water intrusion path functions as a weir. It is possible to reduce the amount of oil leakage and the amount of water entering.

Therefore, the sealing performance can be improved only by adding an intermediate sealing member as compared with the prior art, so that the replacement time of the sealing member can be extended while reducing the manufacturing cost.

[Brief description of the drawings]

FIG. 1 is a side view of an outboard motor according to the present invention.

FIG. 2 is a sectional view of an oil pump 25 of the engine.

FIG. 3 is an enlarged sectional view showing a main part.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Outboard motor, 11 ... Engine, 14 ... Crankshaft, 22
... drive shaft, 23 ... spline fitting part, 25 ... oil pump, 28 ... upper housing, 29 ... lower housing, 35 ... upper seal member, 36 ... lower seal member, 3
7 ... Intermediate seal member 37.

Claims (1)

    [Claims]
  1. An outboard having an oil pump disposed at a lower end of an engine and mounted on a crankshaft, and a drive shaft spline-fitted to the lower end of the crankshaft penetrated through a housing of the oil pump. In the machine, the housing has an upper seal member for sealing between the lower end of the crankshaft, a lower seal member for sealing between the upper end of the drive shaft, and a lower seal member located between these upper and lower seal members. An intermediate seal member for sealing between the drive shaft and
    The upper seal member and the intermediate seal member prevent lubricating oil from leaking from above to below, and the lower seal member prevents water from entering from below to above. And outboard motor.
JP2001100650A 2001-03-30 2001-03-30 Outboard engine Pending JP2002293292A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2001100650A JP2002293292A (en) 2001-03-30 2001-03-30 Outboard engine

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2001100650A JP2002293292A (en) 2001-03-30 2001-03-30 Outboard engine
US10/066,507 US6626714B2 (en) 2001-01-31 2002-01-31 Oil pump arrangement for marine drive

Publications (1)

Publication Number Publication Date
JP2002293292A true JP2002293292A (en) 2002-10-09

Family

ID=18954074

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2001100650A Pending JP2002293292A (en) 2001-03-30 2001-03-30 Outboard engine

Country Status (1)

Country Link
JP (1) JP2002293292A (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5095794U (en) * 1973-12-29 1975-08-11
JPH10238325A (en) * 1996-12-24 1998-09-08 Sanshin Ind Co Ltd Oil pump structure for engine for outboard motor
JPH10329793A (en) * 1997-05-30 1998-12-15 Sanshin Ind Co Ltd Oil seal holding structure for outboard motor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5095794U (en) * 1973-12-29 1975-08-11
JPH10238325A (en) * 1996-12-24 1998-09-08 Sanshin Ind Co Ltd Oil pump structure for engine for outboard motor
JPH10329793A (en) * 1997-05-30 1998-12-15 Sanshin Ind Co Ltd Oil seal holding structure for outboard motor

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