JP3317402B2 - 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 outboard motor equipped with a vertical crankshaft V-type engine, and more particularly to an oil return structure provided in a mount case thereof.

[0002]

2. Description of the Related Art The cylinder axis of an engine is made substantially horizontal,
In an outboard motor in which the crankcase is positioned closer to the hull and the cylinder head is positioned closer to the anti-hull, to support the outboard motor body against vibration with respect to the hull, the upper mount is disposed rearward from the vertical axis, and the support position is set. It is effective to make the value approximately coincide with the torque roll axis. Also, in order to secure sufficient mount frame rigidity against an impact load in the vertical direction, it is convenient if the left and right upper mounts form a closed loop. One example is U.S. Pat.
Some are known from the specification of US Pat. No. 500,594. On the other hand, in a four-stroke engine outboard motor, the oil pan is generally located below the cylinder block of the engine, and the return of the lubricating oil flows down into the oil pan.

[0003]

However, the structure disclosed in the above-mentioned U.S. Pat. No. 3,500,594 has the following problem.
A stroke engine was mounted, and no consideration was given to lubricating oil, so application to a 4-stroke engine was not possible.

An object of the present invention is to provide an outboard motor having an oil return structure which can be applied to a four-stroke engine, particularly a four-stroke V-type engine.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, an engine having a substantially vertically oriented crankshaft and a substantially horizontally oriented cylinder is provided. An outboard motor main body comprising a case means for housing the shaft and the propulsion means; an outboard motor mounting means for supporting the outboard motor main body and attaching to the hull; and an outboard motor mounting means and the outboard motor main body. An outboard motor including a vibration isolating means interposed therebetween, wherein an oil pan is provided below the engine, and the engine is arranged in a V-shape in which a plurality of cylinders are opened in the left-right width direction. A V-type engine is provided, each of which has a cam chamber, and a mounting case is interposed between the oil pan and the block subassembly forming the cam chamber and the crank chamber. Open Provided with an oil return opening made to correspond to the cam chamber of the respective said between opening for returning oil to correspond to the cam chamber, characterized in that a oil return opening from the crank chamber.

According to the first aspect of the present invention, in the V-type engine having a substantially vertical crankshaft, the oil can be returned to the oil pan in a short distance from each of the cam chambers of the cylinder opened in the width direction. Further, since the respective oil return openings of the respective cam chambers and crank chambers are independent of each other, the oil flow is not obstructed by the flow from other directions, so that the oil flows more smoothly.

[0007]

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. Hereinafter, embodiments of the present invention will be described with reference to the drawings. Referring to FIGS. 1 to 6, a reference example of the present invention will be described. FIG. 1 is a center sectional view showing an outboard motor A according to a reference example of the present invention, FIG. 2 is a transverse sectional view of an engine portion thereof, FIG. 10 is an outline view of the outboard motor, and FIG. FIG. In FIG. 10, reference numeral 20 denotes an outboard motor main body;
It is attached to the stern of the hull B by the outboard motor attachment means 1.

In FIG. 1 and FIG. 2, the outboard motor mounting means 1 includes a stern bracket 2 fixed to the stern of the hull B and a tilt shaft 3 having a horizontal axis on the stern bracket 2. And a swivel case 5 rotatably supported by the swivel case 4 and a swivel shaft 5 rotatably supported by the swivel case 4 and having a substantially vertical axis.
And upper and lower support members 6, 8 which are provided integrally above and below the swivel shaft 5 and support the outboard motor body 20. The upper support member 6 is integrally provided with a mounting portion 7 for an operation handle or a remote control steering cable extending forward. As shown in FIG. 11, the upper and lower support members 6 and 8 are vibration-proof means (vibration-proof rubber).
The outboard motor main body 20 is supported via 11, 15 respectively. Returning to FIGS. For the anti-vibration means 11 and 15, see FIG.

The outboard motor body 20 has two cylinders 26, one above and the other below, with the crankshaft 22 oriented substantially vertically.
The V-type four-cylinder four-stroke engine 21 in which the V-type expansion angle of the left and right cylinder axes C and C is set to 90 ° or less is disposed at the upper part of the vehicle. The case means 60 is assembled below the lower case.
In the engine 21, reference numeral 23 denotes a journal portion of the crankshaft 22, reference numeral 24 denotes the same crank pin, reference numeral 25 denotes the same crank web, reference numeral 27 denotes a piston, reference numeral 28 denotes a piston pin, reference numeral 29 denotes a connecting rod, reference numeral 31 denotes a crankcase, reference numeral 32 denotes a cylinder block, and reference numeral 33 denotes a cylinder block. Cylinder head, 34 is a cylinder head cover, 35 is a timing belt device, 36 is a cam shaft, 37
Is a rocker arm, 38 is an intake valve, and 39 is an exhaust valve.

The above-described V-type four-cylinder four-stroke engine 2
1 is covered with an engine cover 41, and a silencer 4 is provided through an air inlet 42 provided in the engine cover 41.
3. Intake is performed through a carburetor 44 and an intake manifold 45 into left and right intake passages 46, 46 formed inside the V bank at right and left sides.
Reference numeral denotes an exhaust passage formed outside the V bank of the cylinder head 33, and reference numeral 49 denotes an exhaust passage formed outside the V bank of the cylinder block 32.

A mount case 51 is integrally provided below the engine 21 with bolts to the lower surfaces of the crankcase 31 and the cylinder block 32. 52 is a starter motor, 53 is a flywheel, 54 is a ring gear, and 55 is a crankshaft 22.
An oil pump provided at the lower end, 56 is an oil filter. The case means 60 assembled below the V-type four-cylinder four-stroke engine 21 includes the mount case 5
1 Extension case 61 bolted to the lower surface
And a gear case 71 bolted to the lower surface of the extension case 61.

The extension case 61 accommodates a vertical shaft 62 directly connected to the lower end of the crankshaft 22 and is connected below the vertical exhaust passages 49, 49 formed outside the V-bank of the cylinder block 32, respectively. The exhaust pipes 63, 63 and an oil pan 64 bolted to the lower surface of the mount case 51 are housed. 64a is an exhaust pipe support stay provided on the oil pan 64, 64b is an oil drain bolt, 65 is an upper mount lid integrally formed with the oil pan 64, 66 is an oil strainer, 6
7 is an oil pumping pipe, 68 is an oil suction passage formed in the cylinder block 32, and 69 is an oil discharge passage formed in the crankcase 31.

The gear case 71 includes a lower portion of the vertical shaft 62, a drive bevel gear 72 at a lower end thereof, a propeller shaft 74 having a propeller 73 as a propulsion means, and a pair of driven bevel gears 75, 76 at the ends thereof for forward and backward movement. , A dog clutch 77 for switching between forward and backward, an eccentric clutch operating mechanism 78 and an operating shaft 79 are housed. The operation shaft 79 protrudes outside from the lower part of the extension case 61, penetrates through the swivel shaft 5, protrudes upward, and is connected to an operation system in the engine room.

In the extension case 61 and the gear case 71, partitions 81, 82 are formed, which partition the front and rear portions behind the vertical shaft 62.
The rear of 2 is an exhaust chamber 83. In the submerged state at the lower part of the outboard motor body 20, the exhaust gas in the exhaust chamber 83 passes through the exhaust hole 85 between the propeller shaft holder 84 of the gear case 71 and the propeller 73 in the propulsion state by the propeller 73.
It is discharged into water from an exhaust port 86 in the central part. Exhaust gas in the idling state of the engine 21 is discharged from the upper part of the exhaust chamber 83 to the outside air through the exhaust passage 87 on the lower surface of the mount case 51 and the exhaust port 88 on the upper part of the extension case 61.

In the gear case 71, a cooling water intake chamber 91 is formed around the lower part of the vertical shaft 62 in front of the partition wall 82, and a water pump 92 is provided above the cooling water intake chamber 91. A cooling water inlet 95 provided in the upper mounting lid 65 via
It is connected to the. The cooling water inlet 95 communicates with a cooling water passage 96 formed on the lower surface of the mount case 51 as shown in FIGS.
The cooling water passages 97, 97 on the upper surface side communicate with each other via a. Drainage ports 98, 98 are formed outside the cooling water passages 97, 97 so as to vertically penetrate the mount case 51, and exhaust passages 89, 89 are formed next to the drainage holes 98, 98. The exhaust passage 89 extends upward from the cylinder block 32.
And an exhaust pipe 63 is connected downstream.

In the center of the mount case 51, there is formed an upper mounting concave portion 00 which is open on the lower surface. In the upper mount concave portion 00, the vibration isolating means 11 of the upper support member 6 is housed. ing. That is,
As shown in FIG. 5, the upper vibration isolator 11 accommodates the upper mount rubber 12, which is an elastic body in which the core bar 13, which is a rigid body extending in the left-right direction, is embedded in the upper mount recess 00 from below. Then, the upper support member 6 and the left and right forked arms 6a, 6a and the core metal 13 are connected to the bolt nut 14,
14.

After that, the concave portion 00 is
Upper mounting cover 6 bolted to the lower surface of the center
Close with 5. The upper mounting lid 65 is provided with an extending leg up to the anti-vibration rubber 11 if necessary.
In FIG. 5, the upper mount rubber 11 is symmetrical in the left-right direction.

A lower mounting through-hole 101 is formed in the lower part of the extension case 61 on both left and right sides, and the lower support member 8 is prevented from passing through the lower mounting through-hole 101. The vibration means 15 is housed. That is, as shown in FIG. 6, the lower vibration isolator 15 penetrates an upper mount rubber 16, which is an elastic body in which a core metal 17, which is a rigid body extending in the left-right direction, is embedded, from one side. The lower support member 8 is inserted into the mouth 101 and the left and right forked arms 8a, 8a and
And the bolts and nuts 19,
19.

Thereafter, the through-hole 101 is connected to the left and right sides of the extension case 61 by bolts.
Close by 2,102. Reference numeral 103 denotes a reinforcing portion of the extension case formed at the front part of the opening of the through-hole 101 so as to be substantially flush with the lid member 102. In FIG. 6, the lower mount rubber 15 is bilaterally symmetric.

Further, as shown in FIGS. 1, 3 and 4, a main oil return port 111 is formed in the mount case 51 at a position opposite to the upper mount concave portion 00 with the cooling water passage 96 interposed therebetween. In addition, a concave wall surface 112 opening to the upper surface and a concave wall surface 113 opening to the lower surface are formed. On the left and right sides of the upper mounting concave portion 00, the auxiliary oil return passages 114, 114 are opened on the lower surface, and are formed in the front-rear direction with the heat insulating space 51a closed by the upper mount cover 65 interposed therebetween. Have been. In FIG. 3, reference numeral 115 denotes a connection surface with the crankcase 31, and reference numeral 116 denotes a connection surface with the cylinder block 32. In FIG. 4, reference numeral 117 denotes a connection surface between the oil pan 64 and the upper mount cover 65, and reference numeral 118 denotes a connection surface with the extension case 61.

Next, the oil circulation path of the engine 21 will be described. First, the oil in the oil pan 64 is removed by the oil pump 55 provided at the lower end of the crankshaft 22.
The oil pumped through the strainer 66, the pumping pipe 67, and the suction passage 68 and discharged to the discharge passage 69 after the oil filter passes through an oil passage 121 formed in the crankcase 31 and an oil passage formed in the cylinder block 32. The oil is supplied to a necessary lubrication unit through an oil passage 123 formed in the cylinder head 33 and the like. Then, the oil in the crankcase 31 and the oil from the cylinder head, which have been used for lubrication, flow down to the upper surface of the mount case 51 and flow into the main oil return port 111 and the sub oil return passages 114, 114. The auxiliary oil return passage 1
Reference numerals 14 and 114 are effective as oil return when the outboard motor is tilted up.

Next, the cooling water circulation path of the engine 21 will be described. First, the water in the water channel is supplied to the gear case 7 by a water pump 92 provided below the vertical shaft 62.
1, a cooling water intake chamber 91, a cooling water discharge port 93, a hose 9
4 through the cooling water inlet 95 of the upper mounting lid 65 and the cooling water passage 96 on the lower surface of the mounting case 51.
To the cooling water passages 97 on the upper surface side through the left and right through holes 96a. The cooling water passages 97, 97 are provided at the sides of the exhaust passages 49, 49.
Cooling water passages 131, 1 which are open and communicate with each other
31 so that the cooling water is supplied to the cylinder block 1
Each of the cylinders 2 passes through cooling water passages 131, 131 formed side by side on both exhaust passages 49, 49 outside the V-bank 31.
6 ... cooling water passages 132 formed around the periphery, exhaust passages 48 of the cylinder head 33 ... cooling water passages 1 formed around the periphery
33 ... and each combustion chamber 47 ... cooling water passage 1 formed around
Flows to 34 ...

The hot water used for cooling in this way is supplied to both cooling water passages 131, outside the V-bank of the cylinder block 31.
The water is discharged into the extension case 61 from the water outlets 98, 98 of the mount case 51 through the water drain passages 135, 135 formed side by side. FIG.
The middle 136 is a thermostat provided between the cooling water passage 132 and the drain passage 135.

As shown in FIG. 4, an exhaust passage 87 on the lower surface of the mount case 51 formed between the upper part of the exhaust chamber 83 in the extension case 61 and the exhaust port 88 is provided around the connecting surface 117 with the oil pan 64. Are separated into a chamber 87a and a chamber 87d communicating with the chamber 87d through through holes 87c formed in a partition wall 87b behind the chamber 87a.
A porous packing P is interposed between the extension case 61 and the extension case 61.

According to the outboard motor having the above configuration, in particular,
With respect to the upper mount portion of the mount case 51 below the engine 21, the upper anti-vibration means in which the core metal 13 extending in the left-right direction is embedded in the upper mount rubber 12 in the upper mount concave portion 00 formed in the lower surface of the center part of the mount case 21. The upper mount 11 can be mounted compactly without affecting the external dimensions of the outboard motor main body 20 because the lower mount 11 is mounted and accommodated from below. And the support member 6
The left and right arms 6a, 6a and the metal core 13 of the upper mount rubber 12 form a closed loop, and therefore have sufficient rubber frame rigidity against a vertical impact load generated during jumping. It has become.

In addition, the main oil return port 111 and the sub oil return passage 11 which communicate with the oil pan 64 while avoiding the upper mount concave portion 00 are provided in the mount case 51.
4, 114, the V-shaped 4
An oil return structure suitable for an outboard motor equipped with a four-stroke engine 21 such as a cylinder is provided.
The cylinder block 32 and the cylinder head 3
The oil from the 3,33 side is shown in FIG.
As shown in FIG. 4, it can directly fall to the left and right of the main oil return port 111 of the mount case 51 and be returned independently to the oil pan 64. In the above reference example, oil flows into the left and right main oil return ports 111 and returns to the inside of the oil pan 64.

7 to 9 show an embodiment of the present invention with respect to the return passage. In the present embodiment, a main oil return port (opening for returning oil from the crank chamber) 111 for returning oil from the crank chamber is provided. Return passages 215, 216 for the oil in each cam chamber outside the cylinder head
And the oil is allowed to flow independently and returned into the oil pan 64. Also in the present embodiment, since the structure of the outboard motor is basically the same as that described above, detailed description is omitted,
The necessary reference numerals will be described.

7 to 9, reference numeral 21 'denotes an engine, 32a denotes a return passage from a crank chamber of a cylinder block, R1 and R2 denote left and right cam chambers, and 201 and 202 denote oil provided in left and right cylinder heads. Return path, 2
03 and 204 are oil return passages to the left and right cam chambers,
05 and 206 are oil return passages provided in the left and right banks of the cylinder block, and 207 and 208 are oil return passage openings (block outlets). Cam room R1,
R2 and the crank chamber 32a form a small block assembly. 209, 211, 210, and 212 are packing surfaces (walls) provided on the lower surface of the cylinder block, concave portions,
Reference numerals 213 and 214 denote packing surfaces (walls) provided on the upper surface of the mount case, and 215 and 216 denote the oil return passages which penetrate the mount case vertically.
7, 218 are left and right oil return pipes attached to the mount case, and 219, 220 are outlets of the pipes.

In the above, the return oil from the cam chambers outside the cylinder heads arranged in the V-shape merges with the return oil from the crank chamber by the cylinder blocks and the walls 209, 210, 211, 212 of the mount case. Without being guided into the oil pan. Further, the oil is returned to the vicinity of the suction port of the strainer communicating with the suction side of the oil pump by the left and right pipes, so that the oil is smoothly returned to the oil pan by the suction force of the pump. Further, since the left and right pipes are independent, even if the outboard motor is slightly inclined to the left or right, the oil is smoothly returned. It should be noted that pipes and the like can be appropriately shared or omitted.

In the above description, the detailed structure of each part has been described. However, it goes without saying that the specific detailed structure and the like can be appropriately changed.

[0031]

As described above, according to the outboard motor of the present invention,
An outboard motor main body comprising an engine having a crankshaft oriented substantially vertically and a cylinder oriented substantially horizontally, a vertical shaft disposed below the engine and a case means for housing the propulsion means. An outboard motor comprising: an outboard motor attaching means for supporting the outboard motor body and attaching the outboard motor body to the hull; and a vibration isolating means interposed between the outboard motor attaching means and the outboard motor body. An oil pan is provided below the engine, and the engine is a V-type engine in which a plurality of cylinders are arranged in a V-shape opened in the left-right width direction, and a cam chamber is provided for each of the engines. A mount case is interposed between the block subassembly and the oil pan, and the mount case is provided with an oil return opening corresponding to each cam chamber at intervals in the width direction, Each mosquito Between the opening for returning oil to correspond to the chamber, providing the oil return opening from the crank chamber. According to the first aspect, in the V-type engine having a substantially vertical crankshaft, the oil can be returned to the oil pan at a short distance from each of the cam chambers of the cylinder opened in the left-right width direction. Further, since the respective oil return openings of the respective cam chambers and crank chambers are independent of each other, the oil flow is not obstructed by the flow from other directions, so that the oil flows more smoothly.

[Brief description of the drawings]

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

FIG. 2 is a cross-sectional view of the engine part.

FIG. 3 is a plan view of a mount case part.

FIG. 4 is a bottom view of the mount case part.

FIG. 5 is a partially broken plan view of an upper mount portion.

FIG. 6 is a cross-sectional view of a lower mount portion.

FIG. 7 is an explanatory view of the engine of the outboard motor according to the present invention as viewed from below.

FIG. 8 is a plan view of the mount case.

FIG. 9 is an enlarged sectional view of a main part of the oil suction and return ports.

FIG. 10 is an external view of an outboard motor according to the present invention.

FIG. 11 is an explanatory view of an anti-vibration means for an outboard motor according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Outboard motor attaching means, 6 ... Upper support member, 6a ... Arm part, 8 ... Lower support member, 8a ... Arm part, 11 ... Upper vibration isolator, 15 ... Lower vibration isolator, 20 ... Outboard Machine body, 2
1: engine, 22: crankshaft, 26: cylinder, 3
1 ... crankcase, 32 ... cylinder block, 33 ...
Cylinder head, 51 ... Mount case, 60 ... Case means, 61 ... Extension case, 62 ... Vertical shaft, 64 ... Oil pan, 71 ... Gear case, 73 ... Propulsion means, 00 ... Upper recess, 101 ... Lower mount penetration Mouth, 111 ... Crank chamber oil return opening, 215,216 ... Cam chamber oil return opening, B
... hull.

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Claims (1)

(57) [Claims] 1. An outboard motor body comprising an engine having a substantially vertically oriented crankshaft and a substantially horizontally oriented cylinder, a vertical shaft disposed below the engine, and a case means for housing the propulsion means. An outboard motor comprising: an outboard motor attaching means for supporting the outboard motor body and attaching the outboard motor body to the hull; and a vibration isolating means interposed between the outboard motor attaching means and the outboard motor body. An oil pan is provided below the engine. The engine is a V-type engine in which a plurality of cylinders are arranged in a V-shape that is opened in the left-right width direction, and a cam chamber is provided for each of the cam chambers. A mounting case is interposed between the small block assembly forming the crank chamber and the oil pan, and an oil return opening corresponding to each of the cam chambers is provided in the mounting case at intervals in the width direction. Set An outboard motor provided with an oil return opening from the crank chamber between oil return openings corresponding to the respective cam chambers.