JP2868151B2 - Outboard motor and water-cooled engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an outboard motor and a water-cooled engine suitable for the outboard motor.

[0002]

2. Description of the Related Art Oil lubrication is extremely important in engines, and is not an exception in outboard motors that require strict compactness. Therefore, the applicant first disclosed in Japanese Unexamined Patent Publication No.
91311 (Japanese Patent Application No. 2-205634) proposed a lubricating oil passage structure suitable for an outboard motor. The main part of FIG. 3 will be described with reference to FIG.

FIG. 8 is a sectional view of a main part of a conventional outboard motor.
The lubricating oil reaching the bottom of the valve operating chamber (21) is supplied to the oil passage (8).
5) or oil outlet pipe (93) (oil hose (9)
4) is discharged in). Since the cooling water passage (119) is provided very close to the oil passage (85), the lubricating oil passing through the oil passage (85) is cooled.

[0004] The oil passage (85) is connected to the cooling water passage (11).
9), the distance of the passage along the cylinder axis becomes longer and the cross-sectional area of the passage becomes smaller, so that it is difficult for oil to flow when inclined. Therefore, in order to cover it, the oil outlet pipe (9
3) is provided in parallel.

[0005]

However, the oil discharge pipe 9 located at a position farther from the tilt axis in the two discharge paths.
3 (oil hose 94), when tilted up, for example, when sailing in shallow water, may require sufficient inclining to ensure its function. If possible, it is possible to improve the function of one oil passage. desirable. An object of the present invention is to improve the oil return function of a conventional oil return passage in an outboard motor and a water-cooled engine.

[0006]

In order to achieve the above object, a first aspect of the present invention is to make the crankshaft substantially vertical, surround at least a part of the engine with an engine cover and an undercase, and provide an oil pan below the engine. In an outboard motor provided with an anti-vibration rubber in a mounting means for mounting the outboard motor body to the hull, the anti-vibration rubber is mounted on an under case, and the under case includes a valve operating chamber of an engine. An oil passage leading from the oil passage to the oil pan and a cooling water passage leading from the extension case side to the water jacket of the engine are provided, and an oil return passage from the valve train chamber and a cooling water passage leading to the oil passage are connected to the engine cylinder block. A cooling water passage to the water jacket is provided, and a part of the cooling water passage cools the anti-vibration rubber and And then passage and cooling water passage is outboard motor is characterized in that it is configured so as not to overlap in plan view. In this outboard motor, since the oil return passage and the cooling water passage do not overlap in a plan view, the shape design of the oil return passage is facilitated.

According to a second aspect of the present invention, a cylinder head having a valve chamber, a cylinder block connected to the cylinder head, the cylinder axis of which is substantially horizontal and the crankshaft of which is substantially vertical, and having a water jacket, and the cylinder block are supported. In an outboard motor comprising an engine mounting member mounted on an extension case and an oil pan arranged on the lower surface of the engine mounting member, the outboard motor has an oil return passage from a cylinder block to the engine mounting member. An outboard motor characterized in that a communication portion and a communication portion of a cooling water passage from the engine mounting member to the cylinder block are provided so as not to overlap in a plan view. In this outboard motor, since the oil return passage and the cooling water passage do not overlap in a plan view, the shape design of the oil return passage is facilitated.

According to a third aspect of the present invention, the cylinder axis is substantially horizontal and the crankshaft is substantially vertical, the cylinder head has a valve chamber, and an oil pan is disposed below the cylinder block via an engine mounting member. A water-cooled engine having a water jacket around the oil-cooled engine, the water-cooled engine having at least an oil return passage from the valve chamber to the oil pan, a part of which is formed in the cylinder block. The other part communicating with this is formed on the engine mounting member, and further, the water-cooled engine is
It has a cooling water passage for guiding cooling water from the outside of the engine to the water jacket, a part of this cooling water passage is formed in the engine mounting member, and the other part communicating with this is formed in the cylinder block. A water-cooled engine is characterized in that an oil return passage provided in a cylinder block and a cooling water passage provided in a cylinder block are provided so as not to overlap in a plan view. In this water-cooled engine, since the oil return passage and the cooling water passage do not overlap in a plan view, the shape design of the oil return passage becomes easy.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction of reference numerals. FIG. 1 is a cross-sectional side view of a main part of an outboard motor according to the present invention. The outboard motor 1 includes a water-cooled engine 3 mounted on an under case 2 as an engine mounting member, and An oil pan 4 attached thereto, an extension case 5 also attached below the under case 2, a vertical drive shaft 6 housed in the extension case 5, and an extension case 5
An outboard motor main body 1A including a bevel gear set 7 housed in the inside, a cooling water supply pipe 8 and a water pump 9 also housed in the extension case 5, and an anti-vibration rubber 11U is attached to the outboard motor main body 1A. Outboard motor mounting means 12 which is bolted through 11L.

The outboard motor mounting means 12 is a metal fitting for fixing the outboard motor 1 to the hull. The outboard motor mounting means 12 swings the outboard motor main body 1A right and left in plan view around the swivel shaft 13, and also includes a tilt shaft. 1
The outboard motor main body 1A including the swivel shaft 13 around the center 4 can be flipped clockwise in the drawing. The under case 2 surrounds the water-cooled engine 3 together with the engine cover 15.

FIG. 2 is a side sectional view of a water-cooled engine according to the present invention. In the water-cooled engine 3, the cylinder 31 has an axis substantially in the horizontal direction and the crankshaft 32 has a vertical direction. The joint surface is a substantially vertical surface, and a camshaft 36 and rocker shafts 37, 37 are housed in a valve operating chamber 35 formed in a cylinder head 34. The camshaft 36 is accurately driven by a crankshaft 32 via a timing belt 38. Is done.

A horizontal oil return passage 39 is formed below the cylinder head 34, a bend-type oil return passage 40 is connected to the cylinder block 33, and a vertical oil return passage 41 is connected to the undercase 2. In addition, the cooling water passage 43 is located close to the bend type oil return passage 40 of the cylinder block 33 and the oil return passage 41 of the under case 2 and closer to the hull than the passages 40 and 41.
B is arranged. The cooling water passage 43B faces the water jacket 3A on the water-cooled engine 3 side. The cooling water passage 43B formed in the under case 2 will be described later together with the cooling water passages 43A and 43C similarly formed in the under case 2 based on FIG.

An upper end flange of an oil return pipe 44 is in contact with a peripheral wall of a lower end opening portion of the vertical oil return passage 41 and is bolted. An oil suction pipe 45 is attached to the front side of the oil return pipe 44 in the figure, and this pipe 45 extends to a suction port of an oil pump 47 attached to the lower portion of the cam shaft 36 (not shown), though not shown. (See FIG. 1).

FIG. 3 is a view taken in the direction of arrows 3-3 in FIG. 1 and shows a state in which the head cover 34a (see FIG. 1) is removed. The cylinder head 34 has one head fixing bolt 48 and seven head fixing bolts. 49 are attached to the cylinder block 33. Since the engine of this example has three cylinders and two intake / exhaust valves per cylinder, the left and right rocker shafts 37L (the left and right in this case are determined from the back of the figure). 3 rocker arms 52 ... right rocker shaft 3
7R has three rocker arms 51 ... with collar 53 and spring 5
At 4, it is attached at a predetermined position. Rocker shaft 37
L and 37R have a hollow structure for passing oil. These left and right rocker shafts 37L, 37R are connected to an upper bearing block 56 formed integrally with the cylinder head, an intermediate bearing block 57 formed integrally with the cylinder head, and a lower bearing block 58 formed integrally with the cylinder head. Are supported at three places, and bolts 57b, 5
7b, the opening of the lower end of the rocker shaft is closed by an oil pump housing 47a.

The upper bearing block 56 has a hollow structure formed by stamping, and its concave portion 59 functions to branch oil into a plurality of passages. The recess 59 is provided with a lid 60a (FIG. 2,
(See FIG. 4). The lid body 60a is a bolt 59b provided with a tap 59a provided on the cylinder head 34 (FIG. 3).
It can be attached by screwing it into.

As will be described in detail later with reference to FIG. 4, the bolt hole of the uppermost left head fixing bolt 48 in FIG. 3 is an oil passage 61, and this is connected to the recess 59 by another oil passage 62. 63 is an oil discharge port.

FIG. 4 is a sectional view taken along the line 4-4 in FIG. 1 (the figure is viewed sideways). Oil flows from the main gallery 65 to the crankshaft 32 side and the cylinder head 34 side. To the cylinder block passage 6
6, the oil passage 61 around the bolt, the oil passage 6
2. The oil flows in the order of the oil discharge port 63 and is stored in the recess 59. The oil that has passed through the concave portion 59 flows down to the camshaft 36 through the camshaft through hole 67 formed by punching, and to the hollow portions 37a and 37a of the left and right rocker shafts 37L and 37R. The subsequent flow of the oil will be described separately.

FIG. 5 is a sectional view taken along the line 5-5 in FIG. 1, and shows the upper surface side of the under case 2 with the engine cover 15 removed and the water-cooled engine 3 removed. The oil return passage 41, the oil suction hole 71 (to which the oil suction pipe 45 is connected), the cooling water passage 43A,
43B and 43C. The cooling water passage 43A is formed to be curved at the upper part of the under case 2, and a part thereof is close to one of the vibration-proof rubbers 11U. Further, the cooling water passage 43C is formed to be curved at the lower part of the under case 2, and a part thereof is close to the other anti-vibration rubber 11U. Cooling water passage 43B
Is a communication passage connecting the cooling water passage 43A and the cooling water passage 43C. As described above, the cooling water passages 43A, 43C partially extend toward the hull, and the extended portions are close to the upper mount anti-vibration rubbers 11U, 11U.
U and 11U are cooled.

Although not described so far, in FIG.
73 is an exhaust gas passage for guiding engine exhaust gas into water, 74 is a drain passage for discharging engine cooling water, 75 is a bottom wall of an oil main gallery, and 76 is an oil pan from an engine crank chamber. An oil return passage for returning the oil to the pump, and 6 is a drive shaft.

FIG. 6 is a view for explaining the mounting surface of the oil pan and the extension case corresponding to the sectional view taken along the line 6-6 in FIG. 1. The oil pan packing surface 78 has the oil return passage 41 and the oil suction passage. The hole 71, an oil return passage 76 for returning oil from the crank chamber to the oil pan, and the like are enclosed. The extension case packing surface 79 surrounds the exhaust gas passage 73, the drain passage 74, and the drive shaft 6.

The operation of the outboard motor and the water-cooled engine having the above configurations will be described below. In FIG. 1, the water pumped up by the water pump 9 first enters the cooling water passage 43C, cools one of the anti-vibration rubbers 11U, and then enters the cooling water passage 43A via the cooling water passage 43B. After cooling the remaining anti-vibration rubber 11U, it reaches the water jacket 3A in the water-cooled engine 3 (see also FIG. 5).

In FIG. 2, the oil return passage 39,
A cooling water passage 43 is provided on the hull side (right side in the figure) from 40 and 41.
B and cooling water passages 43A and 43C (not shown) are arranged. In the structure of the conventional example (FIG. 3 of Japanese Patent Application Laid-Open No. 4-91311), the cooling water passage (11) is located on the left side of the oil return passage (85).
Due to 9), the oil return passage (85) gets over the cooling water passage (119), and as a result, the horizontal distance becomes longer and oil is hard to return. If the cross section of the cooling water passage (119) is enlarged in order to increase the cooling capacity, it becomes more difficult for the oil to return. In this regard, in this embodiment, the oil return passages 39 to 41 and the cooling water passages 43A to 43C are arranged so as not to overlap in a plan view, that is, the arrangement shown in FIG. 2, so that the horizontal distance of the oil return passage can be shortened. The function of the two oil passages can be improved, and in some cases, the function of oil return in the conventional oil return passage can be improved.

Further, if the engine 3 is mounted on the under case 2 in FIG. 2 and the oil pan 4 can be mounted on the lower surface, the engine case may be replaced with an engine mounting member of another shape. Also in this case, if the oil return passage and the cooling water passage do not overlap each other in a plan view, the horizontal distance of the oil return passage can be shortened, so that the function of one oil passage can be improved. It is possible to improve the function of oil return in the conventional oil return passage.

FIG. 7 is a side view of the water-cooled engine according to the present invention. The engine 3 is mounted on the engine mounting member 2 corresponding to the under case shown in FIG. The oil return passage (not shown) and the cooling water passage are not overlapped in a plan view. As described above, the water-cooled engine 3 of the present invention is suitable for the outboard motor 1, but may be used for other general-purpose engines.

[0025]

As described above, in the present invention, the oil return passage and the cooling water passage in the engine mounting member such as the undercase are configured not to overlap in plan view. According to the present invention, the horizontal distance of the oil return passage can be reduced, and the function of one oil passage can be improved, as compared with the conventional example in which the oil passage extends over the cooling water passage. It has become possible to improve the oil return function of the oil return passage.

[Brief description of the drawings]

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

FIG. 2 is a side sectional view of a water-cooled engine according to the present invention.

FIG. 3 is a view taken in the direction of arrows 3-3 in FIG. 1;

FIG. 4 is a sectional view taken along line 4-4 in FIG. 1;

FIG. 5 is a sectional view taken along line 5-5 of FIG. 1;

FIG. 6 is a sectional view taken along line 6-6 of FIG. 1;

FIG. 7 is a side view of a water-cooled engine according to the present invention.

FIG. 8 is a sectional view of a main part of a conventional outboard motor.

[Explanation of symbols]

1: Outboard motor, 2: Engine mounting member (under case),
3 ... water-cooled engine, 3A ... water jacket, 4 ... oil pan, 11U ... anti-vibration rubber, 12 ... outboard motor mounting means, 15 ... engine cover, 32 ... crankshaft, 39,
40, 41 ... oil return passage, 43A, 43B, 43C
... Cooling water passage.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F02B 67/00 B63H 20/00 B63H 20/28 F01M 1/06 F01P 3/20

Claims (3)

(57) [Claims] A crankshaft has a substantially vertical orientation, at least a part of an engine is surrounded by an engine cover and an undercase, an oil pan is provided below the engine, and a mounting means for mounting the outboard motor body to the hull is provided. In an outboard motor provided with an anti-vibration rubber, the anti-vibration rubber is mounted on the under case, and the under case includes an oil passage leading from an engine valve chamber to the oil pan and an extension case side. A cooling water passage leading from the valve operating chamber to the oil passage and a cooling water passage leading to the cooling water passage in the cylinder block of the engine. And a part of the cooling water passage cools the anti-vibration rubber, and the oil return passage and An outboard motor characterized in that the cooling water passage is configured so as not to overlap in plan view. 2. A cylinder head having a valve chamber, a cylinder block connected to the cylinder head, the cylinder axis being substantially horizontal and the crankshaft being substantially vertical, and having a water jacket, and an extension for supporting the cylinder block. In an outboard motor comprising an engine mounting member mounted on a case and an oil pan disposed on a lower surface of the engine mounting member, the outboard motor is a communication portion of an oil return passage from the cylinder block to the engine mounting member. An outboard motor, wherein a communication part of a cooling water passage from the engine mounting member to the cylinder block is provided so as not to overlap in a plan view. 3. The cylinder axis is substantially horizontal and the crankshaft is substantially vertical, the cylinder head has a valve chamber, and an oil pan is disposed below the cylinder block via an engine mounting member. A water-cooled engine having a water jacket, the water-cooled engine has at least an oil return passage from the valve chamber to the oil pan, and the oil return passage is partially formed in a cylinder block. The water-cooled engine further has a cooling water passage for guiding cooling water from outside the engine to a water jacket, and the cooling water passage is partially connected to the water cooling engine. Is formed on the engine mounting member, and another part communicating with the engine mounting member is formed on the cylinder block, and the oil return passage provided on the cylinder block is provided. A water-cooled engine, wherein a passage and a cooling water passage provided in the cylinder block are provided so as not to overlap in a plan view.