JP2921803B2 - Outboard motors and engines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ship comprising an engine having a crankshaft oriented substantially vertically and an even number of four or more cylinders arranged vertically in a substantially horizontal direction arranged at the upper part of the main body. The present invention relates to an external unit and an engine thereof, and more particularly to a configuration of a fuel supply unit disposed on one side of the engine.

[0002]

2. Description of the Related Art An outboard motor in which an engine having a crankshaft oriented substantially vertically and two cylinders arranged vertically in a substantially horizontal direction is arranged at an upper portion of a main body, a single carburetor is used. The structure in which fuel is supplied to the combustion chambers corresponding to the upper and lower cylinders is disclosed in Japanese Utility Model Laid-Open No. 62-22422.
As disclosed in Japanese Patent Application Laid-Open No. 9-209, when the number of cylinders is increased to three or more with an increase in the displacement in order to increase the output, a carburetor for each cylinder is conventionally required.

[0003]

However, arranging a plurality of carburetors vertically on one side of the engine is limited in terms of space and avoids complicated maintenance such as tuning. It was not possible.

[0004] Accordingly, an object of the present invention is to provide an array of 4
It is an object of the present invention to provide an outboard motor with less space limitation on the side of the engine and the engine itself by devising the structure of the fuel supply means in a cylinder having at least an even number of cylinders.

[0005]

According to a first aspect of the present invention, a crankshaft oriented substantially vertically, a plurality of cylinders arranged vertically in a substantially horizontal direction, and a plurality of cylinders are provided. An outboard motor body including an overhead combustion chamber, an intake passage opening to one side from each combustion chamber, and an engine having fuel supply means to each intake passage on one side; An outboard motor supporting means for supporting the main body and attaching the outboard motor to the stern of the hull, wherein the engine includes an even number of four or more cylinders, and the fuel supply means is arranged vertically. A plurality of carburetors are provided for each of the two cylinders forming a pair, and a connection is made between each of the carburetors and the intake passages corresponding to the two cylinders forming a pair arranged vertically. Comprising a plurality of intake pipes, wherein Two intake passages that are substantially parallel to the axis of the cylinder are formed side by side in the gasifier, and two cylinders that form one pair of the intake passages in the intake pipe are arranged in the intake pipe. A connection is made between one of the intake passages corresponding to each of the two intake cylinders, and the other of the intake passages is connected to the other one of the intake passages corresponding to each of two pairs of cylinders arranged vertically. It is characterized in that two intake paths are formed. In the first invention, the outboard motor mounting means includes upper and lower support members for supporting the outboard motor main body, the engine includes a coupling portion with the upper support member, and It is also characterized in that the vaporizer is arranged above the upper supporting member.

According to a second aspect of the present invention, there is provided a vertically oriented crankshaft, a flywheel provided above the crankshaft, a plurality of cylinders arranged vertically in a horizontal direction,
In an engine having a combustion chamber above each cylinder head, an intake passage opening to one side from each combustion chamber, and a fuel supply means to one side of each intake passage, an even number of four or more cylinders is provided, The supply means includes a plurality of carburetors corresponding to each of the two cylinders forming a pair arranged vertically, and a pair of carburetors arranged in a pair with each other.
A plurality of intake pipes connecting between the intake passages corresponding to the respective cylinders, and the carburetor is formed with two intake passages substantially parallel to the axis of the cylinder arranged side by side. The intake pipe is connected to one of the intake passages corresponding to every two cylinders forming a pair with the one intake passage being arranged vertically and the other intake passage is connected to the intake passage. Forming two intake passages for connecting the other of the intake passages corresponding to every two cylinders forming a pair in a line up and down, and wherein the carburetor is located above an engine lower surface; It is characterized by being disposed below the plane of rotation of the flywheel.

[0007]

In an outboard motor having an engine having four or more even-numbered cylinders arranged in the vertical direction at the upper part of the main body, and in the engine itself, fuel supply means arranged on one side of the engine are arranged vertically. A plurality of carburetors formed by arranging two intake passages substantially parallel to the axis of the cylinder side by side for each of the two cylinders forming a pair, and one intake passage of each carburetor is vertically moved. The other of the intake passages corresponding to each of the two cylinders forming a pair is lined up and down while the other intake passage is connected to one of the intake passages corresponding to each of the two cylinders forming a pair. And a plurality of intake pipes forming two intake passages connecting between the carburetors, so that in a side view, an empty space is secured between upper and lower carburetors or below the carburetors, etc. Reduce space limitations on the side of the engine Door can be.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1 showing a longitudinal side surface of an outboard motor according to a first embodiment to which the present invention is applied, 1 is an outboard motor mounting means, and 20 is an outboard motor main body. The outboard motor mounting means 1 includes a stern bracket 2 fixed to the stern of a hull (not shown), and a tilt shaft 3 having a horizontal axis on the stern bracket 2.
, A swivel case 4 swingably supported through the swivel case 4, a swivel shaft 5 having a substantially vertical axis line rotatably supported by the swivel case 4, and integrally provided above and below the swivel shaft 5. And upper and lower support members 11 and 16 for supporting the outboard motor main body 20. The upper support member 11 is integrally provided with an operation handle or remote control steering cable mounting portion 6 extending forward. Have been. The upper and lower support members 11 and 16 are provided with left and right bifurcated arms 12 and 17 extending rearward, and the outboard motor main body 20 is supported by the arms 12 and 17 via vibration absorbing rubbers 13 and 18. is there.

The outboard motor main body 20 has an in-line multi-cylinder four-cycle engine 21 disposed on an upper portion thereof. The engine 21 has a plurality of crankshafts 22 disposed substantially vertically and extending substantially horizontally rearward. In the embodiment, four cylinders 32 are arranged vertically, 31 is a cylinder block, 38 is a piston, 39 is a connecting rod, 41 is a crankcase, 51 is a cylinder head, 52 is a combustion chamber, 53
Is a head cover, 54 is a cam shaft, 55 and 56 are rocker arms for intake and exhaust valves, 57 and 58 are intake and exhaust valves, and 59 is an ignition plug. The crankshaft 22 has a journal portion 23, a crankpin 24,
A pair of crank webs 25 are integrally provided. Bearings 33, 42,... Formed between the split surfaces of the cylinder block 31 and the crankcase 41 (FIGS. 2 and 3)
(See Reference).

The crankshaft 22 has a balancer driving gear 26 formed on an upper crank web 25a corresponding to the second cylinder 32 from the top, and a camshaft driving pulley at an upper end protruding above the crankcase 41. 27 and a flywheel 28 above it,
A drive gear 29 is provided at the lower end protruding below the crankcase 41. Above the engine 21, a timing belt 62 is mounted on the camshaft driving pulley 27 at the upper end of the crankshaft 22 and the driven pulley 61 at the upper end of the camshaft 54.
An oil filter 63 and a starter motor 64 for starting (see FIGS. 3 and 4) are provided on the side surface of the.
Further, as shown in FIG. 3 to FIG. 5, an intake pipe 65, a carburetor 6
And the intake chamber 67 are connected, and an exhaust manifold 69 is connected to the exhaust passages 36 that open to the other side surface of the cylinder head 51.

In particular, an intake pipe 65 constituting fuel supply means,
The vaporizers 66 and the intake chamber 67 have the following structure. That is, the intake pipe 65 is the first,
A first intake passage 651 connected to the intake passage 35 corresponding to the odd-numbered cylinder 32 and extending along the cylinder 32 so as to be curved and parallel to the side; A second intake passage 652 connected to the intake passage 35 corresponding to the even-numbered cylinder 32, curved toward the cylinder 32 above the second intake passage 35, and extending in parallel along the inside of the first intake passage 651 is provided. It is bifurcated. The two intake pipes 65 are provided, and the first intake path 65 is provided.
The first and second intake paths 652 have substantially the same length. The carburetor 66 includes a first intake path 661 extending in parallel to the side corresponding to the odd-numbered cylinder 32 from above, and a second intake path extending in parallel along the inside of the first intake path 661. 662, and a pair of valves 663, 664 are respectively disposed in both intake paths 661, 662. Two carburetors 66 are also provided, and the first intake path 661 and the second intake path 662 are connected to the first intake path 651 and the second intake path 652 of the intake pipe 65, respectively. The suction chamber 67 includes silencers 671 and 672 connected to the first suction passage 661 and the second suction passage 662 of the vaporizer 66, respectively.
Are extended in parallel along the sides corresponding to the odd-numbered cylinders 32, 32 from above, and the upper silencers 671, 672 and the lower silencers 671, 672
A cavity 673 that connects the spaces and opens downward is integrated.

In the engine 21 described above, three
Lower crank web 2 corresponding to the second cylinder 32
A connection portion between the upper support member 11 and the forked arm portion 12 is provided between the upper crank web 25c and the lower (lowest) cylinder 32 corresponding to the lower (lowest) cylinder 32. That is, as shown in FIGS.
A pair of left and right connecting portions 34 which are substantially box-shaped and continuous in the side wall portions of the cylinder block 31 and the crankcase 41 are brought closer to both sides of the bearing portions 33 and 42 for supporting the crankshaft journal 23c between the b and 25c. , 43,3
4 and 43 are formed integrally. The connecting portions 34, 43, 3
Part of the bifurcated arm 4, 43 faces within the range of the rotation locus R of the crank webs 25 b, 25 c. A concave portion 44 facing the surface 12 is formed.
In the left and right connecting portions 34, 43, 34, 43,
By inserting the left and right arms 12, 12 forming a forked shape of the upper support member 11 with the vibration absorbing rubbers 13, 13 interposed therebetween, the outboard motor main body 1 is outboard with the engine 21 above it. It is supported above the swivel shaft 5 of the machine mounting means 1.

Further, on the front wall of the crankcase 41, a balancer storage portion 45 is formed corresponding to the second cylinder 32 from the top, and a balancer mechanism 71 is disposed in the storage portion 45. . That is, as shown in FIGS. 2 and 4, the balancer mechanism 71 includes a first balancer 73 supported on a first vertical support shaft 72 and a second vertical support shaft 77 disposed laterally of the first balancer 73. And a second balancer 78 supported by the second balancer 78. The first balancer 73 is provided with a driven gear 74 that meshes with the balancer driving gear 26 of the crank web 25a at a speed increase ratio of 1: 2 via a damper rubber 75 at an upper portion, and a weight portion 76 at a lower portion.
Are integrally provided. The second balancer 78 integrally includes a driven gear 79 that meshes with the gear 74 of the first balancer 73 at an upper portion, and also integrally includes a weight (not shown) similar to the above. As shown in FIG. 4, a straight line connecting the axis of the first support shaft 72 and the axis of the crankshaft 22 is the left and right center line L when the vehicle is straight ahead with the outboard motor attached to the hull. In addition, a lid plate 46 that prevents the support shafts 72 and 77 from coming off is bolted to the upper surface of the balancer storage unit 45.

As shown in FIG. 1, the outboard motor main body 20 having the above-described engine 21 disposed thereon has an upper cover 81 and a lower cover 82 that cover the engine 21 and an extension case below the engine 21. The extension shaft 85 is provided with a vertical shaft 91 disposed therein. On both side walls of the extension case 85, connecting portions 87 for supporting the forked arm portion 17 of the lower supporting member 16 via a vibration absorbing rubber 18 are formed. As described above, the outboard motor main body 20 is provided with the upper and lower support members 11 with respect to the swivel shaft 5 of the outboard motor mounting means 1 at a position where a vertical span is secured by the upper engine 21 and the extension case 85 therebelow. , 16 are connected and supported while having a vibration absorbing function by the rubbers 13, 18. The lower cover 82 has a cutout 83 into which the upper support member 11 is inserted. Also, the lower cover 82 and the extension case 8
5, a rear cover 84 is provided to cover the upper rear portion.
An oil pan 88 is connected to the lower surface.

The vertical shaft 91 is connected to the crankshaft 22.
Is transmitted to a propeller shaft having a propeller via a bevel gear mechanism (both not shown) in a gear case (not shown) connected below the extension case 85. The vertical shaft 91 is provided with an extension case. The guide tube 86 is inserted through a guide tube 86 formed at a front portion in the inside 85. The axis C of the crankshaft 22 is offset rearward and parallel to the axis V of the vertical shaft 91, and the driving gear 29 at the lower end of the crankshaft 22 is provided at the upper end of the vertical shaft 91. And a driven gear 92 that meshes with the gear. Therefore, the rotation of the crankshaft 22 is transmitted to the vertical shaft 91 via the gears 29 and 92 forming a rotation transmission mechanism. Note that the upper end of the vertical shaft 91 including the gear 92 is provided on the lower surface of the crankcase 41 and a storage portion 47, 8 formed on a part of the oil pan 88.
9, and is supported by bearings.

According to the outboard motor having the above configuration, at least one of the right and left bifurcated arms 12, 12 of the upper support member 11 coupled to the engine 21 disposed above the outboard motor main body 20. The part, in side view,
Facing between the planes of rotation of the crank webs 25b, 25c,
And, in plan view, the crank webs 25b, 25
c, the coupling block 34, 43, 34, 43 formed on both side walls by the cylinder block 31 and the crankcase 41 of the engine 21 at a position facing the range of the rotation locus R of the engine 21. The bifurcated arm portion 12 of the upper support member 11 is inserted into the outer shape of the engine 21 by 41. Therefore, for example, when the hull is unloaded, it is possible to make the outboard motor portion that enters the inside of the hull in the tilted-up state compact, and it is also possible to effectively suppress an increase in the lateral width of the entire outboard motor. .

Since the axis C of the crankshaft 22 is offset backward from the axis V of the vertical shaft 91, the outboard motor portion that enters the inside of the hull in the tilted-up state can be made more compact as described above. You can do it. Note that, as described above, the axis C of the crankshaft 22 is
Can also be implemented independently by implementing a structure offset from the axis V of the vertical shaft 91, thereby making the outboard motor portion that enters the inside of the hull in a tilted-up state compact.

Further, with respect to the fuel supply means of the engine 21, two intake passages 661, 662 substantially parallel to the axis of the cylinder 32 are provided corresponding to each of the two cylinders 32, 32 arranged in a pair vertically. Two carburetors 66, 66 formed side by side, and one intake passage 66 of each carburetor 66
1 is connected vertically to one of the intake passages 35 (corresponding to the first and third odd numbers from the top) corresponding to each of the two cylinders 32 forming a pair. And the other (the second and fourth even-numbered ones from the top) of the intake passages 35, 35 corresponding to each of the two cylinders 32, 32 forming a pair by connecting the intake passages 662 vertically. And both intake paths 661 and 662 and both intake paths 3
The two intake paths 651, 6 having substantially the same length between the intake paths 65, 35
Because of the structure composed of the two intake pipes 65, 65 forming the 52, an empty space can be secured between the upper and lower vaporizers 66, 66 and below the lower vaporizer 66 in a side view. It has become something. Therefore, the space limitation on the side of the engine 21 where the fuel supply means is provided can be reduced.

The lower part of the carburetor 66 and the lower part of the intake chamber 67 are arranged on the side of the third cylinder 32 from the upper side, and the lower part is an empty space. Crank web 25
coupling portions 34, 43, 3 formed on both side walls by the cylinder block 31 and the crankcase 41 between the b and 25c.
4 and 43 are also effective in avoiding interference with the upper support member 11 into which the forked arm portion 12 has entered.

Next, a second embodiment will be described. FIG. 6 shows an outboard motor according to the second embodiment, in which the same components as those in the first embodiment are denoted by the same reference numerals, and the description of the structure, operation and effects thereof will be omitted. That is, in the second embodiment,
The difference from the first embodiment is that, as shown in the figure, the axis C of the crankshaft 22 is tilted forward so that the upper part thereof is located forward of the lower part, so that it is disposed above the outboard motor main body 20. The engine 21 itself is configured to take a forward leaning posture.

According to the structure in which the axis C of the crankshaft 22 is tilted forward so that the upper part is located forward from the lower part when viewed from the side, the engine 21 coupled and supported by the upper support member 11 tilts forward. Posture, swivel axis 5
, The distance from the engine 21 to the center of gravity of the engine 21 can be shortened, so that, for example, when the hull jumps, the weight load on the swivel shaft 5 from the engine 21 can be reduced. In the above embodiment, the in-line four-cylinder four-cycle engine is used. However, the number of cylinders may be an even number of four or more cylinders, and it is needless to say that the invention can be similarly applied to a two-cycle engine. .

[0022]

As described above, according to the outboard motor and the engine itself of the present invention, the fuel supply means arranged on one side of the engine having four or more even-numbered cylinders arranged in the vertical direction is provided. A plurality of carburetors formed by arranging two intake passages substantially parallel to the axis of the cylinders side by side in correspondence with two cylinders forming a pair arranged vertically, and one intake of each carburetor; The intake path is connected to one of the intake passages corresponding to every two cylinders forming a pair by arranging the paths vertically, and the other intake path is arranged to correspond to each of the two cylinders forming a pair. Since it is composed of a plurality of intake pipes forming two intake paths connecting the other of the passages, an empty space is secured between the upper and lower carburetors and below the carburetors in a side view. To reduce space limitations on the side of the engine It can be.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view showing an outboard motor according to a first embodiment to which the present invention is applied.

FIG. 2 is an enlarged view of a main part showing a coupling part and a balancer mechanism part by the upper support member.

FIG. 3 is a cross-sectional plan view of a joint portion of the upper support member.

FIG. 4 is a cross-sectional plan view of a balancer mechanism and a fuel supply unit.

FIG. 5 is a side view of the engine, showing the fuel supply unit in a cutaway manner.

FIG. 6 is a longitudinal sectional side view showing an outboard motor according to a second embodiment to which the present invention is applied.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Outboard motor mounting means, 11, 16 ... Support member, 20 ... Outboard motor main body, 21 ... Engine, 22 ... Crankshaft, 28 ...
Flywheel, 31 ... cylinder block, 32 ... cylinder, 34, 43 ... connecting part, 35 ... intake passage, 41 ... crankcase, 51 ... cylinder head, 52 ... combustion chamber,
65 ... intake pipe, 651, 652 ... intake path, 66 ... carburetor, 661,662 ... intake path, 67 ... intake chamber, 6
71, 672: silencer, 91: vertical axis.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ identification code FI F02M 35/10 F02M 35/10 301N (58) Field surveyed (Int.Cl. ⁶ , DB name) F02B 67/00 B63H 20 / 00 F02B 61/04 F02M 13/02 F02M 35/10

Claims (3)

(57) [Claims] 1. A crankshaft oriented substantially vertically, a plurality of cylinders arranged vertically in a substantially horizontal direction, a combustion chamber above each cylinder head, an intake passage opening to one side from each combustion chamber, and each intake air An outboard having an outboard motor main body having an engine having fuel supply means for the passage on one side disposed at an upper portion thereof, and an outboard motor mounting means for supporting the outboard motor main body and attaching the outboard motor main body to a stern of a hull In the machine, the engine is provided with an even number of four or more cylinders, and the fuel supply means includes a plurality of carburetors corresponding to each of the two cylinders forming a pair arranged vertically. It is provided with a plurality of intake pipes that connect between each of the carburetors and the intake passages corresponding to the two cylinders forming a pair in the vertical direction, wherein the carburetor has an axis line of the cylinders. Two nearly parallel intake passages on the side Formed side by side, the intake pipe has
One of the intake passages is connected to one of the intake passages corresponding to each of the two cylinders forming a pair by arranging one of the intake passages vertically, and the other intake passage is arranged in a pair by arranging the intake passages vertically. An outboard motor, wherein two intake passages are formed to connect the other of the intake passages corresponding to each of the cylinders. 2. The outboard motor mounting means includes upper and lower support members for supporting the outboard motor main body, the engine includes a coupling portion with the upper support member, and The outboard motor according to claim 1, wherein the vessel is disposed above the upper support member. 3. A vertically oriented crankshaft, a flywheel provided above the crankshaft, a plurality of cylinders arranged vertically in a horizontal direction, a combustion chamber above each cylinder head, and one side from each combustion chamber. In an engine having an intake passage opening to the side and fuel supply means for each intake passage on one side, an even number of four or more cylinders is provided, and the fuel supply means is a pair of cylinders arranged vertically. A plurality of carburetors corresponding to each of the cylinders, and a plurality of intake pipes connecting between each of the carburetors and the intake passages corresponding to the two cylinders paired up and down. The carburetor is formed with two intake passages substantially parallel to the axis of the cylinder side by side, and the intake pipe is provided with one of the intake passages arranged vertically above and below the pair. Eggplant 2
A connection is made between one of the intake passages corresponding to every two cylinders, and the other intake passage is connected to the other one of the intake passages corresponding to every two cylinders forming a pair by arranging vertically. An engine, wherein two intake paths connecting the flywheel are formed, and the carburetor is disposed above a lower surface of the engine and below a plane of rotation of the flywheel.