JPH0948395A - Hull installation structure of propulsion machine for ship - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hull installation structure of a propulsion machine for a ship which can make a turning angle to be large without changing the submergence depth of a screw and the supporting strength to be high. SOLUTION: A propelling shaft 13 is provided so as to intersect with a driving shaft 11 extending to the direction of a crank shaft 2g disposed vertically in this structure. A propulsion machine 1 where a screw 25 is attached to the end of the propelling shaft 13 is installed to a hull 24 so that the propulsion machine 1 can fluctuate vertically around a tilt shaft 19 and turn horizontally around a steering shaft 21. Then, the front end part of a tilt bracket 20 supporting the propulsion machine through the tilt shaft 19 is supported by a steering bracket 22 through the steering shaft 21, the steering bracket 22 is installed to a hull 24, and the steering shaft 21 is disposed substantially perpendicularly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a hull mounting structure for a propulsion device for a ship, which is mounted so as to be swingable up and down around a tilt axis and rotatable left and right around a steering axis.

[0002]

2. Description of the Related Art As a ship propulsion device, there is a structure shown in FIG. In this propulsion device 31, a drive shaft 33 is connected to a lower end of a crank shaft 32a vertically arranged in an engine 32, and a propulsion shaft 35 is orthogonal to a lower end of the drive shaft 33 via a bevel gear mechanism 34. connection,
A screw 36 is attached to the rear end of the propulsion shaft 35. In the figure, 37 is a fuel tank mounted on the rear end of the propulsion unit 31, and 38 is a steering shaft fixed to the lower side of the cylinder block of the engine.

In the propulsion device 31, a tilt bracket 40 is arranged so that a tilt bracket 40 is arranged so as to intersect the intersection of the drive shaft 33 and the propulsion shaft 35 in the direction perpendicular to the plane of the drawing.
Are connected via The front end of the tilt bracket 40 is supported by a clamp bracket 42 via a steering shaft 41 tilted backward, and the clamp bracket 42 is fixed to a hull 43.

The propulsion unit 31 swings the steering shaft 38 up and down to move the screw 3 around the tilt shaft 39.
6 swings up and down between a traveling position at which it is located below the water surface and a tilt-up position which is located above the water surface. Further, by swinging the steering shaft 38 left and right, the propulsion device 31 is rotated left and right around the steering shaft 41, whereby the traveling direction of the ship is adjusted.

[0005]

However, in the above-described conventional hull mounting structure for a propulsion device, when the propulsion device 31 is turned around the steering shaft 41 because the steering shaft 41 is tilted backward, the turning angle is increased. I see, screw 3
The depth of submersion in 6 becomes shallower, and in extreme cases, screw 3
There is a problem that 6 comes out on the water surface.

Further, in the above-mentioned conventional structure, since the so-called cantilever support structure in which only the lower portion of the tilt bracket 40 is supported by the clamp bracket 42, the entire bracket is enlarged in order to obtain the required strength. There was a need.

The present invention has been made in view of the above-mentioned conventional problems. Even if the turning angle is increased, the depth of submersion of the screw does not change, and the hull mounting structure for a marine propulsion machine has high support strength. Is intended to provide.

[0008]

According to a first aspect of the present invention, a propulsion shaft is provided so as to intersect with a vertically arranged drive shaft extending in the crankshaft direction, and a screw is attached to the tip of the propulsion shaft. In a hull mounting structure of a propulsion device for a ship, in which the propulsion device is swingably moved up and down around a tilt axis and pivotable left and right around a steering shaft, the propulsion device is supported via the tilt shaft. The front end portion of the tilt bracket is supported by the steering bracket via the steering shaft, the steering bracket is attached to the hull, and the steering shaft is arranged substantially vertically.

According to a second aspect of the present invention, in the first aspect, the upper and lower portions of the tilt bracket are supported by the steering bracket.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 4 are views for explaining a hull mounting structure of a marine vessel propulsion device according to an embodiment of the present invention, FIG. 1 is a left side view showing a tilt-up state, and FIG. 2 is a right side of an engine portion. FIG. 4 is a plan view and FIG. 4 is a cross-sectional side view of the propulsion shaft split portion.

In the figure, reference numeral 1 is a marine propulsion machine, which has a structure in which an upper case 3 and a lower case 4 are sequentially connected to a lower end surface of an engine unit 2 and a propulsion case 5 is connected to a rear end surface of the lower case 4. It is a thing.

The cylinder block 2a of the engine unit 2 is horizontally arranged with the cylinder bore axis facing the front of the hull. The crankcase 2b is connected to the rear mating surface of the cylinder block 2a and the cylinder head is mounted on the front mating surface. Two
c, the head cover 2d is laminated and joined. The piston 2e arranged in the cylinder bore of the cylinder block 2a is connected to the crankshaft 2g via the connecting rod 2f.
The crankshaft 2g is arranged vertically.

A starting pulley 6 around which a starting rope is wound is mounted on the upper end of the crankshaft 2g, and the cylinder head 2 is located in front of the pulley 6 housing case 6a.
A fuel tank 7 is mounted in the upper space of c. Also,
The carburetor 8 is connected to the external connection port of the intake port opening on the right wall surface of the cylinder head 2c, and the exhaust pipe 9 having a muffler is connected to the external connection port of the exhaust port opening on the upper wall surface. There is.

A support bracket 10a of the steering handle 10 is bolted and fixed to the front surface of the head cover 2d. The steering handle 10 has a rod shape extending substantially horizontally and is located at substantially the same height as the cylinder bore axis.

A drive shaft 11 housed in the upper case 3 is coupled to a lower end portion of the crankshaft 2g, and a lower end portion of the drive shaft 11 is housed in the lower case 4 before and after the drive shaft 11 is housed in the lower case 4. A propulsion shaft 13 housed in the propulsion case 5 is connected via a forward switching mechanism 12. A screw 25 is fixed to the rear end of the propulsion shaft 13.

The forward / reverse switching mechanism 12 includes a drive shaft 1
The cam mechanism 14 is configured to engage either the front or rear propulsion gears 12a, 12b with the shift shaft 12c, which meshes with the drive gear 11a fixed to 1. 14b, switching operation is performed by a switching lever 14c mounted on the steering wheel. Reference numeral 15 is a throttle lever mounted on the steering wheel 10. By rotating the lever 15, the throttle opening of the carburetor 8 is adjusted.

The front end of the propulsion shaft 13 is connected to the rear end of the shift shaft 12c via a coupling nut 16a and a lock nut 16b housed in the housing 17 of the propulsion case 5. The housing 17 is bolted and fixed to the rear end surface of the lower case 4.
The propulsion case 5 is formed by press-fitting the front end portion of the pipe 18 into the rear end portion of the housing 17 by welding.
The housing 17 is located on the surface of the water during traveling, and the propeller shaft 1 is attached to the pipe 18 which is submerged during traveling.
The smallest diameter pipe material that can accommodate 3 is selected. A rod 26 is fixed to the front side of the screw 25 of the pipe 18 to prevent the screw 25 from interfering with the bottom of the water or algae from being caught in the screw 25.

At the intersection of the drive shaft 11 and the shift shaft 12c of the lower case 4 of the propulsion device 1, a tilt shaft 19 is planted horizontally in the width direction of the ship (vertical direction in FIG. 1). The tilt shaft 19 is pivotally supported by a bifurcated rear part 20a that surrounds the front part of the lower case 4 of the tilt bracket 20 from the left and right, and the propulsion device 1 can swing up and down about the tilt shaft 19. Has become.

A front portion 20b formed in a forked shape above and below the tilt bracket 20 is pivotally supported by a U-shaped steering bracket 22 via a steering shaft 21 arranged vertically. Is bolted and fixed to a clamp bracket 23 fixed to the hull 24. As a result, the propulsion device 1 can turn left and right in the horizontal plane about the steering shaft 21.

Next, the function and effect will be described. When the steering handle 10 is swung downward when the hull is raised to the ground,
The propulsion unit 1 swings around the tilt shaft 19 to a tilt-up position where the screw 25 is located above the water surface. In this case, since the steering wheel 10 is disposed at the cylinder bore axis line height in the propulsion apparatus 1, the steering wheel 10 and the steering wheel 10 are provided as compared with the conventional steering apparatus 31 of FIG. Since the distance H between the upper surface of the clamp bracket 23 and the upper surface of the clamp bracket 23 is wide, the two do not interfere with each other and the tilt can be raised to a higher position.

At the time of traveling, the steering handle 10 is swung upward, the screw 25 is submerged, and the steering handle 10 is moved.
The direction of travel is adjusted by turning left and right. In this case, in the propulsion device 1, the propulsion case 5 is configured by the large-diameter housing 13 and the small-diameter pipe 18, and only the small-diameter pipe portion is submerged in the water. The resistance when turning left and right is small,
Maneuvering is easy.

When navigating in a place where there are a lot of water plants or in shallow water, the screw 25 is located near the water surface for marine vessel maneuvering. In the case of the conventional propulsion device shown in FIG. 5, the steering shaft is inclined. Since it is arranged,
The tilt depth changes depending on the turning angle, and there is a problem that the screw goes out in the air when the steering handle is greatly turned. However, in the propulsion device 1, since the steering shaft 21 is arranged substantially vertically, The tilt depth does not change regardless of the turning angle.
The 5 never leaves the air.

Further, a tilt bracket 20 and a steering bracket 2 for mounting the propulsion device 1 on the hull 24.
The reference numeral 2 is a so-called double-supported structure that is supported by the upper and lower two points via the steering shaft 21, and the supporting strength can be improved as compared with the cantilever structure shown in FIG.

Further, since the cylinder head 2c of the propulsion device 1 is arranged so as to face the front side of the hull, the engine is inclined so that the cylinder head 2c is located on the upper side when the engine is rotating. The lubricating oil in the cylinder head can be prevented from entering the combustion chamber through the gap between the intake valve and the exhaust valve, and the generation of white smoke can be prevented.

Further, in the propulsion device 1, the carburetor 8 is arranged on the side wall of the cylinder head 2c, and the fuel tank 7 is located on the front side of the starting pulley 6 and the cylinder head 2c.
Since the fuel tank 7 is arranged above the carburetor 8 regardless of the attitude of the propulsion unit 1, the fuel can be surely supplied to the carburetor even though the fuel is naturally refueled by gravity.
By the way, in the conventional propulsion unit 31 shown in FIG. 5, the fuel tank 37 is arranged at the rear end portion of the propulsion unit, so the oil level in the fuel tank becomes lower than that of the carburetor depending on the tilt angle of the propulsion unit. There was a case of running out of fuel.

Although the tilt shaft 19 is arranged at the intersection of the drive shaft 11 and the shift shaft 12c in the above embodiment, the position of the tilt shaft 19 is not limited to this. Further, although the steering bracket 22 is separated from the clamp bracket 23, these brackets may of course be integrated.

[0027]

According to the hull mounting structure of the marine vessel propulsion device according to the first aspect of the present invention, since the steering shaft is arranged substantially vertically, when the steering shaft is turned, the propulsion device is rotated around the steering shaft. The screw swivels in a horizontal plane, and the depth of immersion of the screw hardly changes. Therefore, even if the swivel angle becomes large, it is possible to avoid the aerial exposure of the screw.

According to the second aspect of the present invention, since the upper and lower ends of the tilt bracket are supported by the steering bracket, so-called double-sided support is provided, and the support strength can be improved.

[Brief description of drawings]

FIG. 1 is a left side view for explaining a hull mounting structure of a marine vessel propulsion device according to an embodiment of the present invention.

FIG. 2 is a right side view of the above embodiment.

FIG. 3 is a plan view of the above embodiment.

FIG. 4 is a left side view of a cross section around the propulsion shaft in the embodiment.

FIG. 5 is a left side view showing a conventional hull mounting structure for a marine propulsion device.

[Explanation of symbols]

 1 Propulsion Machine 2g Crank Shaft 11 Drive Shaft 13 Propulsion Shaft 19 Tilt Shaft 20 Tilt Bracket 21 Steering Shaft 22 Steering Bracket 24 Hull 25 Screw

Claims (2)

[Claims] 1. A propulsion shaft is provided so as to intersect with a vertically arranged drive shaft extending in the direction of the crank shaft, and a propulsion unit having a screw attached to the tip of the propulsion shaft is mounted on a hull, and is vertically moved around a tilt shaft. In a hull mounting structure of a marine propulsion device that is swingably mounted on the steering shaft and pivotable to the left and right around a steering shaft, a front end portion of a tilt bracket that supports the propulsion device via the tilt shaft is attached to the steering shaft. A hull mounting structure for a marine propulsion device, characterized in that the steering bracket is supported by a steering bracket and is mounted on the hull, and the steering shaft is arranged substantially vertically. 2. A hull mounting structure for a marine propulsion device according to claim 1, wherein two upper and lower portions of the tilt bracket are supported by the steering bracket.