JPH07315292A - Engine oil drain structure for outboard motor - Google Patents

Abstract

PURPOSE:To absorb a center deflection so as to maintain a sealing characteristic even when centers are relatively deflected from each other between a hole part of a recessed part and a drain part by deforming partial contact parts arranged on the inner circumferential face of the hole in a cylindrical sealing material. CONSTITUTION:In an engine oil drain structure for an outboard motor, an opening is arranged on the outside face of a casing extending in the approximately vertical direction of the outboard motor, a recessed part 12 formed by recessing a wall face toward the inside of the casing from the opening is arranged, a hole part 19 is perforated on an upper wall 12a of the recessed part 12, a drain part 6b of an oil pan 6 is arranged in the hole part 19 so that the drain parL 6b projects outward from the inside through the hole part 19 and faces the recessed part, 12, a cylindrical sealing material 20 is arranged between the hole part, 19 and the drain part, 6b, and the inner circumferential face of the cylindrical sealing material 20 is provided with partial contact parts 20b which are brought into partial contact with the drain part 6b.

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 outboard motors.

[0002]

2. Description of the Related Art An outboard motor is disclosed, for example, in Japanese Patent Laid-Open No. 58-438.
A technique of "Outboard motor" in Japanese Patent Publication No. 95 is disclosed, and as shown in FIG. 1 of the above-mentioned publication, the engine 7 is housed in the cowling 6, and the joint surface 12 of the exhaust pipe 8 is An oil pan 13 is suspended and a drive shaft 9 that drives a propeller 39 penetrates through the casing 5 in the vertical direction. As shown in FIG. 2, the bottom portion of the oil pan 13 is placed on a bulging portion 15 bulging rearward of the rear surface of the upper casing 3 via a packing 16. The bulging portion 15 has a through hole 17 facing the drain hole 14. 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 centers of the drain hole 14 and the through hole 17 are deviated.

The present invention has been made to solve the above problems, and an object thereof is to prevent misalignment even when the relative center of the hole of the recess and the center of the drain are misaligned during manufacturing. It is an object of the present invention to provide a product assembled by absorbing and maintaining the sealing property.

[0005]

In order to achieve the above object, the present invention provides an opening in an outer surface of a casing of a outboard motor that extends substantially vertically, and a wall surface is recessed from the opening toward the inside of the casing. A recessed part is provided, a hole is opened in the upper wall of the recess, and a drain part of the oil pan is inserted into the hole so that the drain part projects the hole from inside to outside and faces the recess. And a cylindrical sealing material is interposed between the hole portion and the drain portion, and an inner peripheral surface of the cylindrical sealing material has a partial contact portion with the drain portion.

Further, the cylindrical seal member is tapered so as to reduce its diameter downward, and the drain portion is provided with a tapered surface to be fitted into a tapered tapered hole of the cylindrical seal member.

[0007]

[Effect] Even if the relative center of the hole and the drain of the recess is misaligned, the partial contact part provided on the inner peripheral surface of the hole of the cylindrical seal member is deformed to absorb the misalignment. To do. Therefore, the sealing property can be maintained.

Since the outer peripheral surface of the tubular sealing material is tapered so as to reduce its diameter downward, it is easy to fit the tubular 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 the diameter downward, both misalignment are absorbed. Therefore, the sealing property is improved.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will now 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 that is hung below the engine cover 3, and A gear case 8 is continuously provided below the extension case 7, a propulsion device 9 is arranged at a rear portion of the gear case 8, a stern bracket 10 is provided at an entire upper middle portion of the outboard motor 1, and an upper portion thereof. A handle 11 is provided on the. Inside this upper part, the engine 2 is installed.

FIG. 2 is a vertical sectional side view of the drain portion closed state according to the present invention, and FIG. 3 is an external rear perspective view of the drain portion closed state according to the present invention. 2 and 3, a recess 12 opened rearward is formed at a rear portion of an upper portion of the extension case (casing) 7, and a bottom portion of the oil pan 6 is formed so that the drain portion 6b faces 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 the front in the extension case 7 by a predetermined depth, and is provided with an upper wall 12a, a front wall 12b, a bottom wall 12c, and left and right side walls 12d in succession so as to be partitioned from the extension case 7. The opening 12e is opened rearward. A thick and thick support boss portion 13 is integrally projected rearward in the center of the front wall 12b in the recess 12, and a screw hole 14 that opens to the rear end face is formed in the boss portion 13. Immediately below 13 is provided a stopper piece 15 having a predetermined width integrally with 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 has a thick wall and protrudes downwardly in a truncated cone shape. 16 is formed, and the drain plug 17 is normally screwed to close the drain hole 16 as shown in the drawing.

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

Next, details of the mounting portion of the drain portion 6b will be described with reference to FIG. FIG. 4 is an enlarged cross-sectional view of the 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. At the mounting portion of the drain portion 6b, a large-diameter hole portion (hole portion) 19 is opened in the upper wall 12a of the recess 12, and the large-diameter hole portion 19 has a cylindrical portion having a partial contact portion 20b on its inner peripheral surface. The sealing material 20 is inserted from above, the drain portion 6b of the oil pan 6 is inserted into the tubular sealing material 20 from above to seal the tubular sealing material 20, and the curved flange portion 20c and the lower end of the upper end of the tubular sealing material 20 are sealed. Collar part 20
It is configured such that the edge portion of the large-diameter hole portion 19 is sandwiched and sealed with d.

Therefore, when the relative center between the large-diameter hole portion 19 of the recess 12 and the drain portion 6b is deviated, the partial contact provided on the inner peripheral surface of the hole 20a of the tubular sealing member 20. Part 20
The deformation of b ... Absorbs the misalignment, so that the sealing property is improved. Further, since the edge portion of the large-diameter hole portion 19 is sandwiched by the curved flange portion 20c at the upper end and the flange portion 20d at the lower end of the tubular sealing material 20, the oil pan 6 and the upper wall 12a are vertically attached. When an error occurs, the curved brim portion 20c at the upper end is deformed and absorbed, so that the sealing performance is improved.

Further, the tubular seal member 20 is tapered so that its diameter is reduced downward, and the drain portion 6b also has a tapered surface that fits into the tapered hole (taper hole) 20a of the tubular seal member 20. Therefore, it is easy to fit the tubular sealing material 20 into the large-diameter hole portion 19 of the recess 12, and the drain portion 6
Since the misalignment between b and the hole (taper hole) 20a is absorbed,
The sealing property is improved.

Referring again to FIGS. 2 and 3, the above recess 12 is covered with the drain cover 21. The drain cover 21 includes a base piece 21a that closes the opening 12e of the recess 12,
The base piece 21a is set so as to fit the curved surface of the rear surface of the extension case 7, and is formed so as to be integrated 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.
The side pieces 21b facing the left and right side walls 12d of the recess 12 and lightly contacting the side walls 12d of the recess 12 or having a slight clearance are provided, and the side pieces 21b project inwardly of the recess 12 by a predetermined length, It is formed on both sides of the above-mentioned stopper piece 15 so that the end edge 21c extends to the inside thereof. That is, the drain cover 21 is formed in 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 ends of the side pieces 21b so that the lower piece 21d extends inwardly of the recess 12. In the embodiment, the size is set smaller than the side piece 21b, and the lower piece 21d abuts on the recess bottom wall 12c.

A tubular mounting boss portion 22 is integrally formed at the center of the base piece 21a so as to project inwardly of the recess 12, and the tip 22a of the boss 22 is a support boss for the recess front wall 12b. The drain cover 21 is in a closed state in contact with the end surface of the portion 13, and the rear end of the mounting boss 22 has an enlarged concave seat portion 2
2b is formed.

Then, the mounting boss portion 2 of the drain cover 21
The fixing screw 23 is passed from the outside through the hole 22c of No. 2, the screw portion 23a of the screw tip is screwed into the screw hole 14 of the support boss portion 13, and the head 23b of the screw 23 is screwed into the seat portion 22b. Two
The drain cover 2 does not project to the surface of 1a,
1 is detachably fixed to the boss portion 13 of the recess 12. The above is shown in FIGS.

When the oil in the oil pan 6 is to be discharged when the engine oil is replaced, the screw 23 is first loosened to release the connection between the boss portion 22 of the drain cover 21 and the boss portion 13 of the recess 12. In this state, the drain cover 21
The drain cover 21 is once removed, or the lower portion of the base piece 21a is pressed to tilt the upper portion toward you, so that the substantially half portion of the drain cover 21 having the lower piece 21d remains in the recess 12. The lower edge 21d of the drain cover 21 has a stopper edge 15a.
Is regulated by abutting on the lower surface of the. That is, the drain cover 21 is positioned below the drain portion 6b to form an oil guide trough when the oil is drained from the drain portion 6b, and has a U-shaped cross section that is open upward. Place 12
Supported in.

Since the base piece 21a and the side piece 21b are in light contact with the recess side walls 12d as described above, the base piece 21a and the side piece 21b are inclined to the lower half of the recess 12 as shown in FIG. It is locked in the state. As a result, the recess 12 is opened, 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 downflow oil flows down on the lower half portion of the drain cover 21 which faces directly below.

In the drain cover 21, the base piece 21a has a recess 12
The upper half portion projects outward from the opening 12e and is curved so as to coincide with the rear surface of the extension case 7. Therefore, the oil is inclined downward and the oil that has flowed down onto the drain cover 21 is directed upward of the base piece 21a. It flows on the back side that became
It flows down from the top end of the curved upper half, and a container (not shown) is faced under this to contain the downflow oil. Since the upper half of the drain cover 21 projects rearward, the container has a rear surface of the extension case 7. It is possible to surely store and collect the flowing-down oil without abutting against it and without scattering the flowing-down oil to the surroundings.

The drain cover 21 is provided with side pieces 21b on both sides of the base piece 21a. Therefore, the drain cover 21 has a concave shape as shown in FIG. 5 to serve as an oil guide trough to prevent oil from leaking to both sides. Since the lower piece 21d is standing upright in the interior, it does not scatter and flow out into the interior, and flows out of the recess 12 along the drain cover 21, so that oil does not leak into the recess 12, and Extension case 7
Does not adhere to the rear surface. This is shown in FIGS. 5 and 6, and 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
The cover 21 is fixed to the extension case side through.

FIG. 8 shows another embodiment of the present invention. Since the basic structure is the same as the above, the same parts are designated by the same reference numerals,
Detailed description is omitted. In this embodiment, the drain cover 21
A side projection 21 is provided on the side piece 21b of the side wall, while a long hole (hole) 112 is formed on the side wall 12d of the recess 12, and the projection 121 is engaged with the long hole 112 to form the drain cover 21. The drain cover 21 is pivotally attached so that the drain cover 21 can be moved freely. This prevents the drain cover 21 from being accidentally pulled out toward the front.

In the above embodiment, the example in which the oil pan is integrally provided in the lower part of the engine has been shown, but the point is that a recess is provided in a part of the casing of the outboard motor and the drain part faces this. For example, the present invention can be implemented.

[0029]

The present invention has the following effects due to 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 of the outboard motor extending substantially vertically, 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 a drain portion of the oil pan is arranged in the hole so that the drain portion projects the hole from the inside to the outside and faces the recess. A cylindrical sealing material is interposed between the drain portion and the drain portion, and the inner peripheral surface of the tubular sealing material has a partial contact portion with the drain portion, so that the hole portion and the drain portion of the recess are formed. Even if the relative center with respect to the core is displaced, the partial contact portion provided on the inner peripheral surface of the hole of the tubular sealing material is deformed to absorb the center displacement. Therefore, the sealing property can be maintained.

According to a second aspect of the present invention, there is provided an engine oil drain structure for an outboard motor, wherein the tubular seal member is tapered so as to reduce its diameter downward.
By providing the drain surface with a tapered surface that fits into the tapered tapered hole of the tubular sealing material, the outer peripheral surface of the tubular sealing material is tapered so that the diameter decreases downward. It is easy to fit into the hole of the. 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 the diameter downward, both misalignment are absorbed. Therefore, the sealing property is improved.

[Brief description of drawings]

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

FIG. 2 is a vertical cross-sectional side view of a drain portion closed state according to the invention.

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

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

FIG. 8 is a diagram of another embodiment of the drain portion open state according to the present invention.

[Explanation 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 (sealing material), 20a ... Hole, 20b ...
Partial contact part, 20c ... Curved collar part at the upper end, 20d ...
Collar at the bottom.

Claims (2)

[Claims] 1. An opening is provided in an outer surface of a casing of the outboard motor extending substantially vertically, and a recess is formed by recessing a wall surface from the opening toward the inside of the casing. An upper wall of the recess is provided. A hole is opened in the hole, and the drain part of the oil pan is arranged in the hole so that the drain part projects the hole from the inside to the outside and faces the recess, and a cylinder is provided between the hole and the drain part. An engine oil drain structure for an outboard motor, wherein a cylindrical sealing material is interposed, and an inner peripheral surface of the cylindrical sealing material has a partial contact portion with a drain portion. 2. The tubular sealing material is tapered so as to reduce its diameter downward, and the drain portion has a tapered surface that fits into a tapered tapered hole of the tubular sealing material. Item 1. An engine oil drain structure for an outboard motor according to Item 1.