JP2935410B2 - Engine oil drain structure of outboard motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine oil drain structure for an outboard motor.

[0002]

2. Description of the Related Art Outboard motors are disclosed, for example, in Japanese Patent Laid-Open No. 58-438.
No. 95 discloses an outboard motor technology, which discloses an engine 7 housed in a cowling 6 and a joint surface 12 of an exhaust pipe 8 as shown in FIG. An oil pan 13 is suspended and a drive shaft 9 that drives a propeller 39 extends vertically through the casing 5. As shown in FIG. 2, the bottom of the oil pan 13 is placed via a packing 16 on a bulging portion 15 bulging rearward of the rear surface of the upper casing 3. A through hole 17 facing the drain hole 14 is formed in the bulging portion 15. The drain hole 14 is closed by a drain bolt 18 via a through hole 17.

[0003]

In the above-mentioned conventional drain structure, there is no consideration when the relative center of the drain hole 14 and the through hole 17 is shifted.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to eliminate misalignment even when the relative center between the hole of the recess and the drain is misaligned during manufacturing or the like. It is an object of the present invention to provide a device that can be assembled in a state where it absorbs and maintains a sealing property.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an outboard motor having an opening provided on an outer surface of a generally vertically extending casing, and a concave wall formed from the opening toward the inside of the casing. A recessed part is provided, a hole is formed in the upper wall of the recess, and a drain part of an oil pan hanging from the lower surface of the engine is formed in the hole , and the drain part projects the hole out of the hole. arranged to face the recess, a cylindrical sealing member is interposed between the hole and the drain section, we have a partial contact portion between the drain portion on the inner peripheral surface of the cylindrical sealing member, further,
A drain portion of the oil pan is provided on an upper surface of the cylindrical sealing material.
The peripheral lower end surface is applied .

Further, the cylindrical sealing material is tapered so as to reduce its diameter downward, and the drain portion is provided with a tapered surface which fits into a tapered tapered hole of the cylindrical sealing material.

[0007]

[Function] Even when the relative center between the hole of the recess and the drain is misaligned, the misalignment is absorbed by the deformation of the partial contact portion provided on the inner peripheral surface of the hole of the cylindrical sealing material. I do. For this reason, sealing performance can be maintained.

Since the outer peripheral surface of the cylindrical sealing material is tapered such that the diameter thereof is reduced downward, it is easy to fit the cylindrical sealing material into the hole of the recess. Since the inner peripheral surface of the hole of the cylindrical sealing material and the outer peripheral surface of the drain portion are both tapered so as to reduce in diameter downward, the misalignment of both is absorbed. For this reason, the sealing property is improved.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a side view of an outboard motor according to the present invention. The outboard motor 1 includes an engine cover 3 composed of an upper cover 4 and a lower cover 5, an extension case 7 continuously provided thereunder, and A gear case 8 is provided below the extension case 7, a propulsion device 9 is provided at a rear portion of the gear case 8, and a stern bracket 10 is provided at an entire upper intermediate portion of the outboard motor 1, and a stern bracket 10 is provided at an upper portion thereof. Is provided with a handle 11. The engine 2 is mounted inside the upper part.

FIG. 2 is a longitudinal side view of the drain portion in a closed state according to the present invention, and FIG. 3 is an external rear perspective view of the drain portion in a closed state according to the present invention. 2 and 3, a recess 12 is formed at the rear of the upper portion of the extension case (casing) 7 so as to be opened rearward, and the bottom of the oil pan 6 is positioned so that the drain 6b faces above the recess 12. 6a is provided. The oil pan 6 is hung on the lower surface of the engine.

The recess 12 is recessed to a predetermined depth in the front of the extension case 7 and is continuously provided with an upper wall 12a, a front wall 12b, a bottom wall 12c, and left and right side walls 12d to be partitioned from the inside of the extension case 7. An opening 12e is formed rearward. At the center of the front wall 12b in the recess 12, a thick and large-diameter support boss 13 is integrally formed to protrude rearward, and the boss 13 is formed with a screw hole 14 opening to the rear end face. Immediately below the stopper 13, a stopper piece 15 having a predetermined width is integrally provided from the front wall 12b so as to project rearward.

The drain portion 6b of the oil pan 6 faces the upper wall 12a of the recess 12, and the drain portion 6b is thick and protrudes downward in the shape of a truncated cone. The drain hole 16 is closed by screwing a drain plug 17 as shown in the drawing.

The drain plug 17 has a screw shaft portion 17a to be screwed into the screw hole and a head 17c with a flange 17b, and the flange 17b is sealed with a packing or washer 18 interposed therebetween, and the drain portion 6b is provided on the upper wall 12a. The drain portion 6b including the drain plug 17 projects below the upper wall 12a and faces the upper part of the recess 12 through the large-diameter hole portion 19 via a cylindrical sealing material (sealant) 20.

Next, details of the mounting portion of the drain portion 6b will be described with reference to FIG. FIG. 4 is an enlarged sectional view of a mounting portion of the drain portion according to the present invention, in which the mounting portion of the drain portion 6b shown in FIG. 2 is enlarged. The drain portion 6b is attached to a cylinder having a large-diameter hole (hole) 19 formed in the upper wall 12a of the recess 12 and a partial contact portion 20b on the inner peripheral surface of the large-diameter hole 19. The cylindrical seal member 20 is fitted from above, the drain portion 6b of the oil pan 6 is inserted into the cylindrical seal member 20 from above to seal, and the curved flange portion 20c at the upper end of the cylindrical seal member 20 and the lower end thereof Collar 20
and d, the edge portion of the large-diameter hole portion 19 is sandwiched and sealed. Then, as is clear from FIG.
(The upper surface of the tubular sealing material 20)
), The lower end surface of the oil pan 6 around the drain portion 6b (d)
The base end face 6c of the lens portion 6b was applied.

For this reason, when the relative center of the large-diameter hole portion 19 of the recess 12 and the drain portion 6b is displaced, the partial contact provided on the inner peripheral surface of the hole 20a of the cylindrical sealing material 20 is formed. Part 20
Since the misalignment is absorbed by the deformation of b, the sealing property is improved. In addition, since the edge of the large-diameter hole 19 is sandwiched between the curved upper flange 20c and the lower flange 20d of the cylindrical sealing material 20, the oil pan 6 and the upper wall 12a are vertically mounted. When an error occurs, the curved flange portion 20c at the upper end is deformed and absorbed, so that the sealing performance is improved.

Further, the cylindrical sealing member 20 has a tapered shape whose diameter is reduced downward, and the drain portion 6b also has a tapered surface which fits into a tapered hole (tapered hole) 20a of the cylindrical sealing member 20. For this reason, it is easy to fit the cylindrical sealing material 20 into the large-diameter hole portion 19 of the recess 12, and the drain portion 6
b to absorb the misalignment between the hole (tapered hole) 20a,
Sealability is improved.

Returning to FIG. 2 and FIG. 3 again, the above recess 12 is covered with a drain cover 21. The drain cover 21 includes a base piece 21a for closing the opening 12e of the recess 12,
The base piece 21a is set so as to conform to the rear curved surface of the extension case 7, and is formed so as to form a sense of unity with the outer surface of the extension case 7 when the recess 12 is closed by the cover 21.

The drain cover 21 is provided on both sides of the base piece 21a.
A side piece 21b that faces the left and right side walls 12d of the recess 12 and is lightly pressed against the side walls 12d of the recess 12 or has a side piece 21b having a slight clearance, and the side piece 21b protrudes into the recess 12 by a predetermined length, The edge 21c is formed so as to be located on both sides of the above-described stopper piece 15 and extend to the inside thereof. That is, the drain cover 21 has a U-shaped cross section.

A lower piece 21d is connected to the lower end of the base piece 21a, and both ends of the lower piece 21d are integrally connected to the lower end of the side piece 21b. In the embodiment, the length is set smaller than the side piece 21b, and the lower piece 21d abuts on the concave bottom wall 12c.

A cylindrical mounting boss 22 is integrally formed at the center of the base piece 21a so as to protrude inwardly of the recess 12, and the tip 22a of the mounting boss 22 is supported by the support boss of the recess front wall 12b. The drain cover 21 is in a closed state in a state where the drain cover 21 is in contact with the end surface of the portion 13, and the concave seat portion 2 having an enlarged diameter
2b is formed.

The mounting boss 2 of the drain cover 21
The screw 23a at the tip of the screw is screwed into the screw hole 14 of the support boss 13, and the head 23b of the screw 23 is screwed into the seat 22b to form a base piece. 2
1a without projecting to the surface, the drain cover 2
1 is detachably fixed to the boss 13 of the recess 12. The above is shown in FIGS.

When the oil in the oil pan 6 is discharged to replace the engine oil, the screw 23 is first loosened to release the connection between the boss 22 of the drain cover 21 and the boss 13 of the recess 12. In this state, the drain cover 21
Is free, and the drain cover 21 is once removed, or the lower portion of the base piece 21a is pressed or the like, and the upper portion is tilted toward the front, so that approximately half of the side having the lower piece 21d of the drain cover 21 remains in the recess 12. The inclination of the lower piece 21d of the drain cover 21 is
Is regulated by abutting on the lower surface. That is, the drain cover 21 is located below the drain portion 6b so as to form an oil guide gutter when draining oil from the drain portion 6b, and has a U-shaped cross section opened upward. Place 12
Supported within.

Since the base piece 21a and the side piece 21b are in light contact with the side walls 12d of the recess as described above, they are inclined to the lower half of the recess 12 as shown in FIG. Locked in state. As a result, the recess 12 is opened, and the drain plug 17 is screwed out and withdrawn, whereby the drain hole 16 is released, and the oil in the oil pan 6 is discharged from the drain hole 16. The oil flows down from the drain hole 16 into the recess 12, and the flowing oil flows down above the lower half of the drain cover 21, which is inclined right below.

The drain cover 21 has a base piece 21a having a recess 12
The upper half protrudes outward from the opening 12e of the base case 21 and is curved so as to coincide with the rear surface of the extension case 7, so that the oil flowing down onto the drain cover 21 flows upwardly into the base piece 21a. Flows on the back side,
It flows down from the tip of the curved upper half, and a container (not shown) faces downward and the flowing oil is stored in the container. Since the upper half of the drain cover 21 projects rearward, the rear surface of the extension case 7 And the falling oil can be reliably contained and recovered without being scattered around.

The drain cover 21 has side pieces 21b erected on both sides of the base piece 21a, and therefore has a concave shape as shown in FIG. 5 to serve as an oil guide gutter, thereby preventing oil from leaking to both sides. Since the lower piece 21d is upright, the back does not scatter and flow to the back, flows down the drain cover 21 and flows out of the recess 12, so that no oil leaks into the recess 12 and Extension case 7
It does not adhere to the rear surface. This is shown in FIGS. 5 and 6, and shown in FIG. 7 as a perspective view.

After draining the oil, the drain plug 17 is screwed into the drain hole 16, the drain cover 21 is raised, and the screw 23
To fix the cover 21 to the extension case.

FIG. 8 shows another embodiment of the present invention. The basic structure is the same as that described above, and the same parts are denoted by the same reference numerals.
Detailed description is omitted. In this embodiment, the drain cover 21
The side piece 21b has a protrusion 121 protruding laterally, while a side wall 12d of the recess 12 is provided with a long hole (hole) 112, and the protrusion 121 is engaged with the long hole 112, and the drain cover 21 is The drain cover 21 is not pivotally attached so that the drain cover 21 can be inadvertently pulled out toward the user.

As described above, the embodiment shows an example in which the oil pan is integrally provided at the lower part of the engine. The point is that a recess is provided in a part of the casing of the outboard motor and the drain portion faces here. That is, the present invention can be implemented.

[0029]

According to the present invention, the following effects are exhibited by the above configuration. The engine oil drain structure for an outboard motor according to claim 1, wherein an opening is provided in an outer surface of a casing extending substantially vertically of the outboard motor, and a wall surface is recessed from the opening toward the inside of the casing. A hole is formed in the upper wall of the recess, and the drain of the oil pan hanging from the lower surface of the engine is exposed in the hole , and the drain projects from the inside of the hole to face the recess. place manner, the tubular sealing member is interposed between the hole and the drain section, have a partial contact portion between the drain portion on the inner peripheral surface of the cylindrical sealing member, further wherein
On the upper surface of the cylindrical sealing material, around the drain part of the oil pan
Even if the relative center between the hole of the recess and the drain is misaligned by applying the lower end surface of the concave portion, the partial contact portion provided on the inner peripheral surface of the hole of the cylindrical sealing material is deformed. By absorbing misalignment. For this reason, sealing performance can be maintained.

According to a second aspect of the present invention, the engine oil drain structure of the outboard motor has a tapered shape in which the cylindrical sealing member is reduced in diameter downward.
By providing the drain portion with a tapered surface that fits into the tapered tapered hole of the cylindrical seal material, the outer peripheral surface of the cylindrical seal material is tapered so that the diameter decreases downward. It is easy to fit into the hole. Since the inner peripheral surface of the hole of the cylindrical sealing material and the outer peripheral surface of the drain portion are both tapered so as to reduce in diameter downward, the misalignment of both is absorbed. For this reason, the sealing property is improved.

[Brief description of the drawings]

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

FIG. 2 is a vertical side view of the drain portion in a closed state according to the present invention.

FIG. 3 is an external rear perspective view of the drain portion in a closed state according to the present invention.

FIG. 4 is an enlarged sectional view of a mounting portion of a drain portion according to the present invention.

FIG. 5 is a vertical sectional side view of the drain portion according to the present invention in an open state.

FIG. 6 is a rear view of the drain portion according to the present invention in an open state;

FIG. 7 is a perspective view of the drain portion in an open state according to the present invention.

FIG. 8 is a view showing another embodiment of the present invention in a state where the drain portion is opened.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Outboard motor, 6 ... Oil pan, 6a ... Bottom part, 6b ... Drain part, 7 ... Casing (extension case), 1
2 ... recess, 12a ... upper wall, 12b ... back wall (front wall), 12
c: bottom wall, 12d: side wall, 12e: opening, 16: drain hole, 17: drain plug, 19: hole (large diameter hole), 2
0: cylindrical sealing material (sealant), 20a: hole, 20b:
Partial contact portion, 20c ... A curved flange at the upper end, 20d ...
The collar at the lower end.

Continuation of the front page (56) References JP-A-58-43895 (JP, A) JP-A-51-158595 (JP, U) JP-A-61-186698 (JP, U) JP-A-57-205447 (JP) , U) Hikaru 2-65756 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) B63H 20/00 F02B 67/00

Claims (2)

(57) [Claims] An opening is provided in an outer surface of a casing extending substantially vertically of an outboard motor, and a recess is formed by recessing a wall surface from the opening toward an inside of the casing, and an upper wall of the recess is provided. A drain portion of an oil pan hanging from the lower surface of the engine is disposed in the hole portion such that the drain portion projects the hole portion from outside to face the concave portion, the cylindrical sealing member is interposed between the hole and the drain section, we have a partial contact portion between the drain portion on the inner peripheral surface of the cylindrical sealing member, further
The drain of the oil pan is placed on the top surface of the cylindrical sealing material.
The engine oil drain structure of the outboard motor, characterized in that the lower end surface around the engine part is applied. 2. A method according to claim 1, wherein said cylindrical sealing material has a tapered shape whose diameter is reduced downward, and said drain portion has a tapered surface fitted into a tapered tapered hole of said cylindrical sealing material. Item 2. An engine oil drain structure for an outboard motor according to Item 1.