JPH0643203U - Outboard motors and water-cooled engines - Google Patents

Abstract

(57) [Summary] [Objective] To provide an outboard motor and a water-cooled engine with an improved optional oil return passage. [Structure] A part of the cooling water passages 43A, 43C cools the anti-vibration rubber 11U, and the oil return passages 39, 4
0 and 41 and the cooling water passages 43A to 43C are configured so as not to overlap in a plan view. Since the oil return passage and the cooling water passage are configured so as not to overlap each other in a plan view, the horizontal distance of the oil return passage can be shortened, and thus the oil return function of the return passage can be improved.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

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

[0002]

[Prior art]

 Oil lubrication is extremely important in engines, and it is no exception in outboard motors where compactness is strictly required. Therefore, the applicant previously proposed a lubricating oil passage structure suitable for an outboard motor in Japanese Patent Application Laid-Open No. 4-91311 (Japanese Patent Application No. 2-205634). The essential part of FIG. 3 is reproduced in FIG.

FIG. 8 is a cross-sectional view of a main part of a conventional outboard motor. Lubricating oil reaching the bottom of the valve operating chamber (21) is stored in an oil passage (85) or an oil outlet pipe (93) (oil hose (94). )). 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.

Since the oil passage (85) wraps around so as to get over the cooling water passage (119), the distance of the passage along the cylinder axis becomes longer and the cross-sectional area of the passage becomes smaller, and accordingly, at the time of inclination. , Oil is hard to flow. Therefore, it is characterized in that the oil outlet pipe (93) is provided in parallel to cover it.

[0005]

[Problems to be solved by the device]

 However, the oil outlet pipe 93 (oil hose 94) located at a position farther from the tilt axis in the two discharge paths should be tilted enough to ensure its function when tilted up, such as when running in shallow water. There are some considerations, and it is desirable to improve the function of one oil passage if possible. Therefore, an object of the present invention is to improve the conventional oil return function of the return passage in the outboard motor and the water-cooled engine.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention installs a vibration-proof rubber in the under case, and the under case connects the oil passage leading from the engine valve chamber to the oil pan and the extension case side to the engine water jacket. A cooling water passage is provided, and an oil return passage from the valve operating chamber leading to the oil passage in the cylinder block of the engine and a cooling water passage to the water jacket leading to the cooling water passage are provided, and a part of the cooling water passage is provided. Is configured to cool the anti-vibration rubber and prevent the oil return passage and the cooling water passage from overlapping in a plan view.

[0007]

[Action]

 Since the oil return passage and the cooling water passage do not overlap each other in plan view, the shape of the oil return passage can be easily designed.

[0008]

【Example】

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

The outboard motor mounting means 12 is a metal fitting for fixing the outboard motor 1 to the hull, and swings the outboard motor body 1A left and right in plan view about the swivel shaft 13 and tilts. The outboard motor body 1A including the swivel shaft 13 around the shaft 14 can be flipped up in the clockwise direction 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, a cylinder block 33 and a cylinder block 33 and a cylinder are arranged such that a cylinder 31 has a substantially horizontal axis and a crankshaft 32 is vertical. The joint surface of the head 34 is a substantially vertical surface, and the cam shaft 36 and the rocker shafts 37, 37 are housed in the valve operating chamber 35 formed in the cylinder head 34. The cam shaft 36 is connected to the crank shaft 32 via the timing belt 38. Driven accurately.

A horizontal oil return passage 39 is formed below the cylinder head 34, a bend 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, a cooling water passage 43B is arranged 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, 41. The cooling water passage 43B faces the water jacket 3A on the water cooling engine 3 side. The cooling water passage 43B formed in the under case 2 will be described later with reference to FIG. 5 together with the cooling water passages 43A and 43C also formed in the under case 2.

An upper end flange of an oil return pipe 44 is brought into contact with and bolted to a peripheral wall of a lower end opening portion of the vertically oriented oil return passage 41. An oil suction pipe 45 is attached to the front side of the oil return pipe 44 in the figure. The pipe 45 extends to the suction port of an oil pump 47 attached to the lower portion of the camshaft 36, though not shown in the middle but not shown. (See Figure 1).

FIG. 3 is a view taken in the direction of arrow 3-3 of FIG. 1, showing a state in which the head cover 34a (see FIG. 1) is removed, and the cylinder head 34 has one head fixing bolt 48 and seven head fixing bolts. It is attached to the cylinder block 33 by 49 ... Since the engine of this example has three cylinders and has two intake valves and one exhaust valve per cylinder, the left rocker shaft 37L (left and right in this case are determined from the back of the figure). On the right rocker shaft 37R and three rocker arms 51 on the right rocker shaft 37R by collars 53 and springs 54 at predetermined positions. The rocker shafts 37L and 37R have a hollow structure for allowing oil to pass therethrough. These left and right rocker shafts 37L and 37R are composed of an upper bearing block portion 56 formed integrally with the cylinder head, an intermediate bearing block portion 57 formed integrally with the cylinder head, and a lower bearing block portion formed integrally with the cylinder head. It is supported at three points 58, and is prevented from rotating by bolts 57b and 57b, and the lower end opening of the rocker shaft is closed by an oil pump housing 47a.

The upper bearing block 56 has a hollow structure formed by die cutting, and the recess 59 thereof functions to branch the oil into a plurality of passages. The recess 59 is closed by a lid 60a (see FIGS. 2 and 4). The lid 60a is attached by screwing a bolt 60b into a tap 59a (FIG. 3) provided on the cylinder head 34.

As will be described in detail later with reference to FIG. 4, the bolt hole of the head fixing bolt 48 at the upper leftmost position in FIG. 63 is an oil discharge port.

FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. 1 (the view is viewed sideways). Although the oil is split from the main gallery 65 to the crankshaft 32 side and the cylinder head 34 side, the cylinder head 34 Flow in the order of the cylinder block internal passage 66, the oil passage 61 around the bolt, the oil passage 62, and the oil discharge port 63, and are accumulated in the recess 59. The oil that has passed through the concave portion 59 flows down to the cam shaft 36 through the die-formed cam shaft through hole 67 and to the hollow portions 37a and 37a of the left and right rocker shafts 37L and 37R, respectively. The flow of oil after that will be described separately.

FIG. 5 is a sectional view taken along line 5-5 of FIG. 1, showing the upper surface side of the undercase 2 with the engine cover 15 removed and the water-cooled engine 3 removed. The oil return passage 41, the oil suction hole 71 (the oil suction pipe 45 is connected), and the cooling water passages 43A, 43B, 43C are shown on the left side of the center of the figure. The cooling water passage 43A is curvedly formed in the upper portion of the undercase 2, and a part of the cooling water passage 43A approaches one of the vibration isolating rubbers 11U. Further, the cooling water passage 43C is curvedly formed in the lower portion of the undercase 2, and a part of the cooling water passage 43C is close to the other vibration isolating rubber 11U. The cooling water passage 43B is a communication passage connecting the cooling water passage 43A and the cooling water passage 43C. In this way, the cooling water passages 43A and 43C partially extend to the hull side, and the extended portions are close to the upper mount antivibration rubbers 11U and 11U to cool the antivibration rubbers 11U and 11U. There is.

Although not described so far, in FIG. 5, 73 is an exhaust gas passage for guiding engine exhaust gas into water, 74 is a drain passage for discharging engine cooling water, and 75 is an oil main. The bottom wall of the gallery, 76 is an oil return passage for returning oil from the crank chamber of the engine to the oil pan, 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 of FIG. 1, and the oil pan packing surface 78 has the oil return passage 41 and the oil suction passage. The shock hole 71 and the oil return passage 76 for returning the oil from the crank chamber to the oil pan are enclosed, and 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 configured as described above 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 vibration isolation rubbers 11U, and then enters the cooling water passage 43A via the cooling water passage 43B. After cooling the remaining vibration isolating rubber 11U, the water jacket 3A in the water-cooled engine 3 is reached (see also FIG. 5).

Further, in FIG. 2, a cooling water passage 43B and cooling water passages 43A and 43C (not shown) are arranged on the hull side (right side in the figure) from the oil return passages 39, 40 and 41. In the structure of the conventional example (Japanese Patent Application Laid-Open No. 4-91311, FIG. 3), the cooling water passage (119) is provided on the left side of the oil return passage (85) (the reference numeral with () indicates the prior art). Since the oil return passage (85) gets over the cooling water passage (119), the horizontal distance becomes long and it becomes difficult for the oil to return. When the cross section of the cooling water passage (119) is enlarged to increase the cooling capacity, it becomes more difficult for oil to return. In this respect, 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 plan view, that is, the arrangement shown in FIG. The function of the three oil passages can be improved, and in some cases, the function of the oil return of the conventional return passage can be improved.

Furthermore, if the engine 3 is placed on the under case 2 in FIG. 2 and the oil pan 4 can be attached to the lower surface, it may be replaced with an engine attachment member of another shape. Even in this case, if the oil return passage and the cooling water passage do not overlap each other in plan view, the horizontal distance of the oil return passage can be shortened and the function of one oil passage can be improved. Can improve the conventional oil return function of the return passage.

FIG. 7 is a side view of the water-cooled engine according to the present invention. Inside the engine mounting member 2, the engine 3 is mounted on the engine mounting member 2 corresponding to the undercase of FIG. In the above, the oil return passage (not shown) and the cooling water passage do not overlap each other in 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.

[0024]

[Effect of device]

 As described above, according to the present invention, the oil return passage and the cooling water passage are configured so as not to overlap each other in the engine mounting member such as the undercase in a plan view. Therefore, the horizontal distance of the oil return passage can be shortened, and thus one oil It was possible to improve the function of the passage, and in some cases, it was possible to improve the oil return function of the conventional return passage.

[Brief description of drawings]

FIG. 1 is a side sectional view of an essential 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 on arrow 3-3 of FIG.

4 is a sectional view taken along line 4-4 of FIG.

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

FIG. 6 is a sectional view taken along line 6-6.

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 (undercase),
3 ... Water-cooled engine, 3A ... Water jacket, 4 ... Oil pan, 11U ... Anti-vibration rubber, 12 ... Outboard motor mounting means, 15 ... Engine cover, 39, 40, 41 ... Oil return passage, 43A, 43B, 43C ... Cooling water passage.

Claims (3)

[Scope of utility model registration request] 1. An engine cover and an undercase surround at least a part of an engine, an oil pan is provided below the engine, and a vibration-proof rubber is provided in a mounting means for mounting an outboard motor body on a hull. In the outboard motor, the anti-vibration rubber is attached to the undercase, and the undercase has an oil passage leading from the engine valve chamber to the oil pan and a cooling passage leading from the extension case side to the engine water jacket. A water passage is provided, and an engine cylinder block is provided with an oil return passage from the valve operating chamber leading to the oil passage and a cooling water passage to a water jacket leading to the cooling water passage. A part of the passage cools the anti-vibration rubber, and the oil return passage and the cooling water passage overlap in plan view. An outboard motor characterized by being configured so as not to run. 2. A cylinder head having a valve chamber, a cylinder block connected to the cylinder head and having a water jacket in which the cylinder axis is substantially horizontal, and an engine mounting member mounted on an extension case to support the cylinder block. And an oil pan arranged on the lower surface of the engine mounting member, the outboard motor comprising: a connecting portion of an oil return passage from the cylinder block to the engine mounting member; An outboard motor, wherein the communication part of the cooling water passage to the block is provided so as not to overlap in a plan view. 3. A water-cooled engine having a cylinder axis substantially horizontal, a cylinder head having a valve chamber, an oil pan disposed below a cylinder block through an engine mounting member, and a water jacket around the cylinder. Therefore, this water-cooled engine has at least an oil return passage from the valve chamber to the oil pan, and a part of the oil return passage is formed in the cylinder block, and the other portion communicating with the cylinder block is formed. It is formed on an engine mounting member, and further, the water-cooled engine has a cooling water passage for guiding cooling water from the outside of the engine to a water jacket, and this cooling water passage is partially formed on the engine mounting member, The other part communicating with this is formed in the cylinder block,
An oil return passage provided in the cylinder block,
A water-cooled engine, wherein the cooling water passage provided in the cylinder block is provided so as not to overlap with each other in a plan view.