JPH0717485A - Outboard motor provided with speed increaser - Google Patents

Abstract

PURPOSE:To lower the transmission torque of a lower unit and lessen the sizes of the related parts by arranging two pairs of engaging gears on a speed increasing mechanism arranged between the engine part and the lower unit and coaxially setting the shaft centers of a vertical crankshaft and a vertical drive shaft. CONSTITUTION:An outboard motor is equipped with an engine E containing a vertical crankshaft 1 and a lower unit U transferring power to the lower part of the vertical crankshaft 1. A speed increasing mechanism is arranged between the engine E and the lower unit U. In this case, the speed increasing mechanism is arranged with two pairs of engaging gears 10, 11; 12, 13. The shaft centers of the vertical crankshaft l and a vertical drive shaft 2 are set indentically. Thus transmission torque of the lower unit U is lowered and the gear, the drive shaft, etc., are made smaller. Also the rotation of the vertical crankshaft 1 and the vertical drive shaft 2 are made the same so that engines E to be used can be same as those of the existing ones.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for reducing the transmission torque of a vertical drive shaft in an outboard motor so as to make the gears and shafts of a lower unit compact.

[0002]

2. Description of the Related Art Conventionally, the technology relating to outboard motors has been known. For example, JP-A-62-191298
It is like the technique described in Japanese Patent Laid-Open No. 1-244108. However, the above-mentioned Japanese Patent Laid-Open No. 1-244108.
In the technique of the publication, since the vertical crank shaft and the vertical drive shaft are eccentric and the directions of rotation are opposite, the vertical crank shaft and the vertical drive shaft have substantially the same number of rotations. The torque of the unit increases, and the engine part needs to rotate in the reverse direction.

[0003]

SUMMARY OF THE INVENTION According to the present invention, in order to reduce the transmission torque of the lower unit portion, a speed increasing mechanism is formed between the vertical crank shaft and the vertical drive shaft, and the rotational speed of the vertical drive shaft is increased. By increasing the speed and interposing two sets of meshing gears, the vertical crankshaft and the vertical drive shaft rotate in the same direction, and the rotation speed is reduced by the bevel gear below the vertical drive shaft. Bring it back.

[0004]

The problems to be solved by the present invention are as described above. Next, the means for solving the problems will be described. That is, between the engine unit E having the vertical crankshaft 1 and the lower unit U for transmitting power to the lower portion of the vertical crankshaft 1, between the engine unit E and the lower unit U of the outboard motor. In the structure in which the speed mechanism A is arranged, the speed increasing mechanism A includes two sets of meshing gears, and the vertical crankshaft 1 and the vertical drive shaft 2 have the same shaft center.

Further, one of the meshing gears is a mesh of a spur gear, the other meshing gear is a mesh of a helical gear, and the helical gear side is arranged on the vertical drive shaft 2 side.

Further, the speed increasing mechanism A is composed of a mesh gear, and an oil cooler C is arranged in a casing in which the mesh gear is arranged.

Further, a cooling water passage for the engine section E is built in a casing which houses a meshing gear which constitutes the speed increasing mechanism A.

Further, two of the meshing gears constituting the speed increasing mechanism A
The pair of spur gears are also used as the gear pump for lubricating oil of the engine section E.

A wire harness for an engine is fixed to a gear case in which the speed increasing mechanism A is arranged.

Further, the meshing gear constituting the speed increasing mechanism A is provided with a through hole for allowing lubricating oil to pass therethrough.

[0011]

[Operation] Next, the operation will be described. That is, the transmission torque of the lower unit U is reduced, and the gears and drive shafts of the lower unit U, which is the power transmission unit, can be reduced. Further, since the vertical crankshaft 1 and the vertical drive shaft 2 rotate in the same direction, the engine unit E can be the same as the conventional one. In addition, since the engine portion E is affected by the combination of the meshing gears, the vertical crankshaft 1 side, which cannot apply thrust force, is a spur gear, and the upward thrust force from the lower bevel gear 8 and the bevel gear 7 part. By applying a downward thrust force to the hanging vertical drive shaft 2 with a helical gear, the vertical thrust force can be offset. In addition, there is no need to attach an oil cooler as another shape, and the outboard motor can be made light and compact. Further, the piping of the cooling water sent from the lower unit U can be compactly piped and supplied to the upper engine section E. In addition, it is not necessary to separately form a gear pump for lubricating oil, power loss can be eliminated, and cost can be reduced by sharing parts. Also, at the bottom of the engine section E, wire harnesses 14 and 15 are provided.
It was possible to eliminate the risk of damage due to vibration and fire that would occur if the outboard motor was fixed, and the outboard motor could be made compact as a whole. In addition, it facilitates the drop of the lubricating oil from the engine section E to the lower unit U,
It was possible to prevent an increase in loss horsepower, which would occur due to the lubricating oil staying in the engine section E or the speed increasing case 4, and to prevent the ejection of oil mist from the blazer mechanism of the engine section E.

[0012]

EXAMPLES Next, examples will be described. 1 is an overall cross-sectional view of an outboard motor of the present invention, FIG. 2 is a side view of a portion of a speed increasing mechanism A, a vertical crankshaft 1 and a vertical drive shaft 2 are taken out, and FIG. 3 is a through hole in a speed increasing counter shaft 3. 3a is an enlarged sectional view of an embodiment in which 3a is drilled, FIG. 4 is an enlarged sectional view of an embodiment in which the speed increasing case 4 is configured as an oil cooler, and FIG. 5 is an embodiment in which the speed increasing gears 10 and 11 are also used as a gear pump for lubricating oil. FIG. 6 is an enlarged sectional view of an example, and FIG. 6 is a drawing showing the arrangement of spur gears and helical gears in the speed increasing mechanism A portion.

1 and 2, the overall structure of the outboard motor will be described. That is, the engine unit E having the vertical crankshaft 1 is arranged at the upper portion, and the lower unit U having the vertical drive shaft 2 internally provided at the lower portion. At the lower end of the lower unit U, a propeller shaft 5 and a propeller 6 are arranged. Conventionally, since the vertical crankshaft 1 is directly connected to the vertical drive shaft 2, the rotation of the vertical crankshaft 1 becomes the rotation of the vertical drive shaft 2 as it is, and the bevel gear 8 and the propeller at the lower end of the vertical drive shaft 2 are rotated. The bevel gear 7 at the tip of 6 was interposed to change only the driving direction in a substantially one-to-one relationship.

On the other hand, in the present invention, when the vertical crankshaft 1 and the vertical drive shaft 2 are directly connected, the rotational speed of the vertical drive shaft 2 is low, and when the rotational speed is low,
Since a large torque is applied in order to transmit the same horsepower, it is necessary to increase the diameter of the vertical drive shaft 2, and in accordance with this, the bearing, the support portion, the case of the lower unit, etc. are also constructed to be sturdy. It was necessary to do so. In order to eliminate such a problem, the present invention interposes a speed increasing case 4 at a position between the vertical crank shaft 1 and the vertical drive shaft 2, and the speed increasing mechanism A is provided inside the speed increasing case 4. Is arranged.

As a result, in the speed increasing mechanism A, the rotation of the vertical crankshaft 1 is doubled, and the torque applied to the vertical drive shaft 2 is halved, thereby lowering the strength of the bearing and the supporting portion, and the rotation thereof. Is doubled between the bevel gear 8 and the bevel gear 7, and the propeller shaft 5 and the propeller 6 are decelerated.
The rotation of is configured as usual.

In the structure of the speed increasing mechanism A, the speed increasing counter shaft 3 is arranged in parallel, and the mesh gear 11 and the mesh gear 12 are integrally loosely fitted on the speed increasing counter shaft 3, A meshing gear 10 is fixed to the lower end of the vertical crankshaft 1, and a meshing gear 13 is fixed to the upper end of the vertical drive shaft 2. The speed is increased by the gear train of the meshing gear 10 and the meshing gear 11, and is further increased between the meshing gear 12 and the meshing gear 13.

As shown in FIG. 6, a meshing gear 10 below the vertical crankshaft 1 and a meshing gear 11 above the speed increasing counter shaft 3.
Is a spur gear, and the meshing gear 12 below the speed increasing counter shaft 3 and the meshing gear 13 at the upper end of the vertical drive shaft 2 are helical gears. As a result, the thrust force is not applied to the vertical crankshaft 1 of the engine section E, and the bevel gear 7 and the bevel gear 8 below are thrust.
The vertical drive shaft 2 that receives thrust force from above to
The thrust force on the vertical drive shaft 2 can be offset by arranging the helical gear that applies the downward thrust force.

Next, the embodiment shown in FIG. 3 will be described.
The speed increasing case 4 is interposed between the engine case 20 and the lower unit case 21, and the speed increasing mechanism A inside the speed increasing case 4 is used.
Are configured. A through hole 3a is bored in the speed increasing counter shaft 3 so that the lubricating oil in the engine case 20 flows back into the lower unit case 21. Allows the movement of lubricating oil. A cooling water passage 16 is formed inside the speed increasing counter shaft 3, and the cooling water passing through the inside of the engine case 20 is guided to the cooling water passage 16. Further, wire harnesses 14 and 15 that connect the engine section E and the control section are attached to the side of the speed increasing counter shaft 3.

Next, a description will be given of the embodiment shown in FIG. In this configuration, the lubricating oil passage 1 is provided in the thick portion of the speed increasing case 4.
Molded 7.46. Then, the lubricating oil passage 17.4
By passing the lubricating oil that lubricates the inside of the engine section E and the lower unit U through 6, the entire speed increasing case 4 is substituted for the oil cooler.

Next, the embodiment shown in FIG. 5 will be described. In FIG. 5, a pump partition wall 9 is provided below the portions of the meshing gear 10 and the meshing gear 11, so that this portion also serves as a lubricating oil gear pump. Then, the lubricating oil gear pump discharges the lubricating oil inside the engine section E and the lower unit U.

[0021]

Since the present invention is constructed as described above, it has the following effects. That is, as in claim 1,
Between the engine unit E having the vertical crankshaft 1 and the lower unit U for transmitting power to the lower portion of the vertical crankshaft 1, between the engine unit E and the lower unit U of the outboard motor.
In the structure in which the speed increasing mechanism A is arranged, the speed increasing mechanism A includes two sets of meshing gears, and the vertical crankshaft 1 and the vertical drive shaft 2 are provided.
Since the shaft center of the lower unit U is the same, the transmission torque of the lower unit U becomes small, and the gear and drive shaft of the lower unit U, which is the power transmission portion, can be made small. Further, since the vertical crankshaft 1 and the vertical drive shaft 2 rotate in the same direction, the engine unit E can be the same as the conventional one.

According to a second aspect of the present invention, one of the meshing gears is a spur gear meshing, the other meshing gear is a helical gear meshing, and the helical gear side is arranged on the vertical drive shaft 2 side. Since the engine part E is affected, the side of the vertical crankshaft 1 that cannot apply thrust force is a spur gear, and the bevel gear 8 and the bevel gear 7 at the lower part are against the vertical drive shaft 2 to which upward thrust force is applied. Is capable of canceling the upper and lower thrust forces by applying a downward thrust force by the helical gear.

Since the speed increasing mechanism A is composed of the meshing gear and the oil cooler C is arranged in the casing in which the meshing gear is arranged, it is not necessary to additionally install the oil cooler as another shape. The outboard motor could be made light and compact.

As described in claim 4, since the cooling water passage of the engine section E is built in the casing containing the meshing gear forming the speed increasing mechanism A, piping of the cooling water sent from the lower unit U is provided. It can be compactly piped and supplied to the upper engine section E.

Since the two pairs of spur gears of the meshing gears constituting the speed increasing mechanism A are also used as the lubricating oil gear pump of the engine section E, it is not necessary to separately form a lubricating oil gear pump. The power loss could be eliminated, and the cost could be reduced by sharing the parts.

Since the wire harness for the engine is fixed to the gear case in which the speed increasing mechanism A is arranged as described in claim 6, the wire harness 14.1 is provided below the engine portion E.
It was possible to eliminate the risk of damage or fire due to vibrations that would occur if the 5 was fixed, and the outboard motor could be made compact as a whole.

According to the seventh aspect of the present invention, the shaft portion of the meshing gear which constitutes the speed increasing mechanism A is provided with a through hole for allowing the passage of lubricating oil. Therefore, the lubrication from the engine portion E to the lower unit U is performed. It facilitates oil drop, prevents the increase in loss horsepower that occurs when lubricating oil accumulates in the engine section E and the speed increasing case 4, and prevents the oil mist from spouting from the blazer mechanism of the engine section E. I was able to prevent it.

[Brief description of drawings]

FIG. 1 is an overall cross-sectional view of an outboard motor of the present invention.

FIG. 2 is a side view showing a part of a speed increasing mechanism A, a vertical crank shaft 1 and a vertical drive shaft 2 taken out.

FIG. 3 is an enlarged sectional view of an embodiment in which a through hole 3a is formed in the speed increasing counter shaft 3.

FIG. 4 is an enlarged cross-sectional view of an embodiment in which the speed increasing case 4 is an oil cooler.

FIG. 5 is an enlarged sectional view of an embodiment in which the speed increasing gears 10 and 11 are also used as a gear pump for lubricating oil.

FIG. 6 is a drawing showing the arrangement of spur gears and helical gears in the speed increasing mechanism A portion.

[Explanation of symbols]

 A speed increasing mechanism E engine unit U lower unit 1 vertical crankshaft 2 vertical drive shaft 3 speed increasing counter shaft 4 speed increasing case 5 propeller shaft 6 propeller 7 bevel gear 8 bevel gear 10, 11, 12, 13 meshing gear

Claims (7)

[Claims] 1. A speed increasing mechanism is provided between the engine unit and the lower unit of an outboard motor including an engine unit having a vertical crank shaft and a lower unit for transmitting power to a lower portion of the vertical crank shaft. In the arranged configuration, the speed increasing mechanism is provided with two sets of meshing gears, and the vertical crankshaft and the vertical drive shaft have the same shaft center. 2. The outboard motor with gearbox according to claim 1, wherein one of the meshing gears is a mesh of a spur gear, the other meshing gear is a mesh of a helical gear, and the helical gear side is arranged on the vertical drive shaft side. An outboard motor with a gearbox characterized by the above. 3. A speed increasing mechanism is provided between the engine unit and the lower unit of an outboard motor including an engine unit having a vertical crank shaft and a lower unit for transmitting power to a lower portion of the vertical crank shaft. In the arranged configuration, the speed increasing mechanism is configured by a meshing gear, and an oil cooler is arranged in a casing in which the meshing gear is arranged. 4. A speed increasing mechanism is provided between the engine unit and the lower unit of an outboard motor including an engine unit having a vertical crank shaft and a lower unit for transmitting power to a lower portion of the vertical crank shaft. An outboard motor with a speed increaser, characterized in that, in the arranged configuration, a cooling water passage for an engine is built in a casing that internally houses a meshing gear that constitutes a speed increasing mechanism. 5. A speed increasing mechanism is provided between the engine unit and the lower unit of an outboard motor including an engine unit having a vertical crank shaft and a lower unit for transmitting power to a lower portion of the vertical crank shaft. In the arranged configuration, the outboard motor with a speed increaser, characterized in that two pairs of spur gears of the meshing gears constituting the speed increasing mechanism are also used as a gear pump for lubricating oil in the engine section. 6. A speed increasing mechanism is provided between the engine unit and the lower unit of an outboard motor including an engine unit having a vertical crank shaft and a lower unit for transmitting power to a lower portion of the vertical crank shaft. An outboard motor with a speed increaser, wherein in the arranged structure, a wire harness for an engine is fixed to a gear case in which the speed increasing mechanism is arranged. 7. An engine unit having a vertical crankshaft 1,
In an outboard motor equipped with a lower unit for transmitting power to the lower portion of the vertical crankshaft, in a structure in which a speed increasing mechanism is arranged between the engine unit and the lower unit, a meshing gear forming the speed increasing mechanism. An outboard motor with a speed increaser, wherein a through hole that allows passage of lubricating oil is formed in a shaft portion of the outboard motor.