JPH1067392A - Supporter for four-cycle outboard motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To support a propulsion unit firmly by inserting a steering bracket fixed at a swivel shaft into the inside of a machine frame case. SOLUTION: A steering bracket 32 is joined to a swivel shaft 25, and the supporting plate 42 of an engine 10 is supported on a supporting mount 43 extending from the steering bracket 32 through an annular rubber element 66. The supporting mount 43 is disposed above a supporting plate 42 which is the upper wall of an oil pan 34 and on a rear side than a drive shaft 18. A space is formed between the top surface of the supporting mount 43 and the engine 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a support device for a four-cycle outboard motor.

[0002]

2. Description of the Related Art As described in, for example, Japanese Utility Model Publication No. 47-27113, a conventional outboard motor support device has a crank bracket fixed to a hull, and a swivel bracket rotated around the crank shaft via a tilt shaft. The propulsion unit is movably connected to the swivel bracket and swingably supported via a swivel shaft. The support at the lower end of the swivel shaft supports an intermediate portion in the vertical direction of the machine frame case, and the support at the upper end of the swivel shaft supports the upper portion of the machine frame case.

[0003]

As the outboard motor becomes larger,
When a cycle engine was installed, stable support was difficult only by supporting the machine frame case via the conventional swivel shaft. An object of the present invention is to provide a support device for a four-cycle outboard motor, in which a steering bracket fixed to a swivel shaft is inserted into an inside of a frame case to securely support a propulsion unit.

[0004]

According to the present invention, a crank bracket is fixed to a hull, and a swivel bracket is rotatably connected to the crank bracket via a tilt shaft.
In a support device for a four-cycle outboard motor in which a propulsion unit is swingably supported on a swivel bracket via a swivel shaft, a steering bracket is connected to the swivel shaft, and an annular rubber body is mounted on a support mount extending from the steering bracket. The support plate of the engine was supported through, and the support mount was disposed above the support plate serving as the upper wall of the oil pan and behind the drive shaft, and a space was formed between the upper surface of the support mount and the engine. This is the first configuration. According to the second aspect of the present invention, in the first configuration, the outer wall of the oil pan below the support plate is cooled by cooling water. According to a third aspect of the present invention, in the first and second configurations, a lubricating oil return passage is provided between the support mount and the exhaust pipe.

[0005]

1 to 4 show an embodiment of the present invention. A crank bracket 26 is fixed to a stern plate 30 of the hull, and a swivel bracket 24 is connected to the crank bracket 26 so as to be rotatable up and down around a tilt shaft 28. Crank bracket 26 and swivel bracket 24
A hydraulic cylinder (not shown) is disposed between the swivel bracket 24 and the swivel bracket 24. Swivel shaft 25 inside swivel bracket 24
The upper end of the swivel shaft 25 is fixed to the steering bracket 32, and the two lower support mounts 43A are connected to the lower end of the swivel shaft 25 via a connecting member. The propulsion unit is swingably supported by two upper support mounts 43 extending from the steering bracket 32 and the two lower support mounts 43A. The propulsion unit is rotatably attached to the stern plate 30 vertically and horizontally. The upper casing 12 is supported by a swivel bracket 24 and is rotatable left and right around a swivel shaft 25.

The engine 10 is mounted on an upper casing 12 of the propulsion unit and is covered by a cowling 14. The output of the engine 10 is transmitted to a drive shaft 18 extending through the upper casing 12 to the lower casing 16, and transmitted to a propeller 22 provided on the lower casing 16 via a shift mechanism 20. Reference numeral 34 denotes an oil pan to be described later, which is housed in the upper part of the upper casing 12, and a portion near the oil pan 34 is an exhaust pipe 36 from the engine 10.
Extends downward, and the exhaust pipe 36 is connected to the exhaust expansion chamber 38. The expansion chamber 38 passes through the lower casing 16 and has a propeller
The boss 22 communicates with an exhaust outlet 40 formed in the boss. The two lower support mounts 43A are inserted through both sides of the drive shaft 18 and support a wall portion connected to the expansion chamber 38.

As shown in detail in FIGS. 1 to 4, the engine 10 is rigidly mounted on a support plate 42 mounted on the upper end of the upper casing 12, and has an annular rubber mounted on a support mount 43 extending from the steering bracket 32. body
The support plate 42 of the engine 10 is connected via 66 and supported. 2, a pipe (not shown) is inserted into the center hole of the annular rubber body 66, bolts 68 are inserted into holes, washers and pipes of the plate 69, and the steering bracket 32 And the annular rubber body 66 is fixed. Annular rubber body 66
Is partially covered with a half support member, and the plate 69 has a thrust stop function. The support mount 43 is located above the support plate 42 which is the upper wall of the oil pan 34,
And the camshaft in the drive shaft 18 and the cylinder head 76
75 and is located in the engine
The 10 vibrations are near the inertia main axis, which is the least. The support mount 43 is located rearward of the drive shaft 18, and a return passage 67 for engine oil (lubricating oil) is provided between the support mount 43 and the exhaust pipe 36.
67 is connected to the relief valve 46. This support plate
The oil pan 34 is suspended and fixed to the support plate 42 in a state where the oil pan 34 is sandwiched between the upper casing 12 and the oil pan 34.

The oil pan 34 has a substantially bottomed box shape and has a central portion depressed when viewed from a plane as shown in FIG. 4 so as to pass vertically through the exhaust pipe 36. The wall surface of the exhaust pipe 36 is separated from the wall surface of the depressed portion of the oil pan 34 at a certain distance, and the heat of the exhaust pipe 36 is directly transmitted to the oil pan 34 between the two. An air layer 35 is formed to prevent the air pressure. Reference numeral 44 denotes a screen facing the bottom of the oil pan 34, 45 denotes an oil suction pipe, and 46 denotes a relief valve for oil flowing from the engine 10.

The upper end of the exhaust pipe 36 communicates with an exhaust port (not shown) of the engine 10 through a passage formed in the support plate 42. The lower end of the exhaust pipe 36 extends further below the bottom wall of the oil pan 34, and is supported in a liquid-tight manner by a seal member 50 between the exhaust pipe 36 and a lid 48, which will be described later. It extends to the end.
Reference numeral 52 denotes a water passage which is formed integrally with the exhaust pipe 36 around the exhaust pipe 36, and has a lower end formed around the expansion chamber 38 through the passage 51 of the seal member 50, as shown in FIG. The reservoir 54 and the expansion chamber 38 communicate with each other. This expansion chamber
The upper openings of the reservoir 38 and the water reservoir 54 are closed by a lid 48 and are isolated from the oil pan 34. A drain hole 55 is formed at the lower end of the water reservoir 54. A throttle passage 56 for discharging exhaust gas at a low speed from the expansion chamber 38 is formed in an upper wall portion defining the expansion chamber 38, and the throttle passage 56 is formed between the inner wall of the upper casing 12 and the partition wall 57. Sub expansion chamber 58
Through an exhaust outlet 60 provided at the upper part of the outer wall of the upper casing 12. Here, the sub-expansion chamber 58 is also isolated from the outer wall of the oil pan 34.

The cooling water is obtained by sucking seawater around the outboard motor from a water intake port (not shown) of the lower casing 16 by a cooling water pump 62 driven by the drive shaft 18. The cooling water is introduced upward to the engine 10 through a cooling water suction pipe 63, and after cooling the engine 10, the engine cooling water is guided to the water passage 52 through the support plate 42. . According to such a configuration, engine oil, which has been lubricated to various parts of the engine 10 and returned to a high temperature through the return passage 67 and the relief valve 46, is sucked from the screen 44 into the oil pan 34. Engine 10 again through tube 45
To be pumped.

Exhaust gas from the engine 10 is introduced into an expansion chamber 38 through an exhaust pipe 36. Since the exhaust pipe 36 faces the wall surface of the oil pan 34 via the air layer 35, the heat of the exhaust is not directly transmitted to the oil pan 34 and does not heat the oil pan. The exhaust gas is expanded in the expansion chamber 38 and is silenced. At a high speed, the air is discharged from the outlet below the expansion chamber 38 through the passage of the lower casing 16 to the sea through an exhaust outlet 40 that opens into the water.
Since the expansion chamber 38 is isolated from the oil pan 34 by the lid 48, the exhaust gas released to the expansion chamber 38 does not touch the oil pan 34 to heat the oil pan. At a low speed, the air is discharged from the expansion chamber 38 through the throttle passage 56 to the air from the exhaust outlet 60 through the auxiliary expansion chamber 58. Here, too, the sub-expansion chamber 58 is isolated from the oil pan 34 by a partition wall 57.

The water sucked in as cooling water is pumped upward from the cooling water suction pipe 63 to the engine 10 to cool the engine. The cooling wastewater after cooling the engine is first introduced into the water passage 52 around the exhaust pipe 36 to cool the exhaust pipe 36 and the exhaust gas passing therethrough. After that, a part of the cooling wastewater falls into a water reservoir 54 around the expansion chamber 38 and another part falls into the expansion chamber 38. Thereby, the expansion chamber 38
Direct and indirect cooling of the exhaust gas inside. The water that has fallen into the expansion chamber 38 returns to seawater from below. Although a small amount of the water that has entered the water reservoir 54 is discharged downward from the drain hole 55, it is retained here because the supply amount is large, and effectively cools the outer wall of the expansion chamber 38. Here, a notch (not shown) may be provided at the upper end of the water reservoir 54 so that the water stored in the water reservoir 54 overflows and returns along the inner wall of the upper casing 12 to the sea surface.

[0013] Even if the water accumulated in the water reservoir 54 jumps due to external force or exhaust pressure transmitted from the sea surface to the outboard motor or the like, since the upper portion is blocked by the lid 48, the salt is removed. Splashes of the contained water can be prevented from adhering to the oil pan 34, so that corrosion of the oil pan 34 can be reliably prevented. That is, as in the conventional case, when seawater droplets adhere to the oil pan during use of the engine and the oil pan is heated by the exhaust, the seawater droplets crystallize, and the crystals grow each time the engine is used, and the outboard motor The salt crystallized when not in use absorbs the moisture in the air due to the deliquescence, and comes into contact with the air and receives the supply of oxygen, which corrodes the outer wall of the oil pan. Can be prevented. In order to prevent the water that has entered the expansion chamber 38 from flowing backward, a side hole 65 is preferably provided on one side wall of the portion of the exhaust pipe 36 that extends into the expansion chamber 38.

FIG. 5 shows a modification of the embodiment of the present invention. This modification is different from the above-described embodiment in that an exhaust pipe 36 and an oil pan 34 are integrally formed, and both are connected. Wall 70
At a certain interval from each other. In this case, the connecting wall 70 connects the outer wall of the water passage 52 of the exhaust pipe 36 and the outer wall of the oil pan 34, which is desirable from the viewpoint of preventing the oil pan 34 from being heated.

FIG. 6 shows another modification of the embodiment of the present invention. The other modification is different from the above-described embodiment in that the cooling water introduced into the engine 10 from the cooling water suction pipe 63 is provided. Upper casing 12 containing water, oil pan 34 on the way
This is a point that is opened above the lid 48. According to this modification, since the cooling water also flows between the bottom outer wall of the oil pan 34 and the separated oil pan 34 and the exhaust pipe 36, the oil pan 34 is actively cooled, In addition, the exhaust pipe 36 is also cooled more effectively. Here, since the cooling water flows during the operation of the engine, it does not crystallize on the outer wall of the oil pan or the like. When the operation is stopped, the cooling water that does not flow down and adheres to the oil pan wall evaporates due to the residual heat of the oil in the oil pan, and salt may crystallize. It is negligible compared to when seawater droplets crystallize and grow.

In FIG. 6, reference numeral 72 denotes a bypass hole for partially introducing cooling water from the cooling water suction pipe 63 into the water reservoir 54, whereby the expansion chamber 38 can be cooled more effectively. The cooling water is allowed to flow to the vicinity of the partition wall 57 that separates the sub-expansion chamber 58 and the oil pan 34, and also cools the exhaust of the sub-expansion chamber 58. It can also be discharged from outlet 74. In the embodiment of FIG. 2, the lower part of the air layer 35 in the figure and the water reservoir 54 communicate with each other through a small hole, and the engine cooling water after cooling the engine is guided to the air layer 35 in the figure to function as a water reservoir. You may do it.

[0017]

According to the first aspect of the present invention, the support plate of the engine is supported by a support mount extending from the steering bracket via an annular rubber body, and the support mount is provided above the support plate serving as the upper wall of the oil pan. The space is formed behind the drive shaft and between the upper surface of the support mount and the engine. Therefore, a portion of the engine supporting plate of the propulsion unit where the vibration is small is strongly supported by the support mount, and the vibration is hardly transmitted to the hull. In addition, a space is formed between the upper surface of the support mount and the engine, and heat conduction from the engine to the annular rubber body of the support mount is small. According to the second aspect of the present invention, since the outer wall of the oil pan below the support plate is cooled by the coolant, the support plate serving as the upper wall of the oil pan is also cooled, and the annular rubber body of the support mount is prevented from being heated. The life of the rubber body is prolonged. According to the third aspect, an oil return passage is arranged between the support mount and the exhaust pipe, and heat conduction from the exhaust pipe to the support mount is prevented.

[Brief description of the drawings]

FIG. 1 is a side view showing the overall structure of a four-cycle outboard motor according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a main part showing a main part of a support device for a four-cycle outboard motor according to an embodiment of the present invention.

FIG. 3 is a sectional view taken along line III-III in FIG. 2;

FIG. 4 is a sectional view taken along line IV-IV in FIG. 2;

FIG. 5 is a cross-sectional view of a principal part at the same position as FIG. 4 showing a modification of the embodiment of the present invention.

FIG. 6 is a sectional view of a main part showing another modification of the embodiment of the present invention.

[Explanation of symbols]

 10 Engine 18 Drive shaft 25 Swivel shaft 32 Steering bracket 34 Oil pan 42 Support plate 43 Support mount 66 Ring rubber

Claims (3)

[Claims] 1. A crank bracket is fixed to a hull,
A swivel bracket is rotatably connected to the crank bracket via a tilt shaft, and the propulsion unit is swingably supported by the swivel bracket via the swivel shaft.
In a support device for a cycle outboard motor, a steering bracket is connected to a swivel shaft, a support plate extending from the steering bracket supports an engine support plate via an annular rubber body, and the support mount is connected to an upper wall of an oil pan. A support device for a four-stroke outboard motor, wherein the support device is disposed above the support plate and behind the drive shaft, and a space is formed between the upper surface of the support mount and the engine. 2. The four-stroke outboard motor support device according to claim 1, wherein the outer wall of the oil pan below the support plate is cooled by cooling water. 3. The four-stroke outboard motor support device according to claim 1, wherein a lubricating oil return passage is provided between the support mount and the exhaust pipe.