JP5016933B2 - Outboard propulsion system - Google Patents

Description

  In the outboard propulsion device mounted on a boat, the outboard propulsion device can be lifted upward and shifted to smooth sliding when starting to slide from a stopped state.

A boat that slides with an outboard propulsion device (outboard motor or inboard / outboard motor) is not slid or at the start of the skate, and the stern descends and sinks into the water. This state is an oblique state in which the stern is lowered and then inclined downward, and at the start of sliding, it starts to slide in this inclined state.
At the start of gliding, resistance is high and it is difficult to obtain sufficient ship speed. In order to obtain a certain level of boat speed, the stern must be lifted to some extent and the hull posture needs to be almost horizontal. It takes a long time to approach this posture, and smooth acceleration is difficult to obtain.

Therefore, conventionally, a lift device has been proposed that lifts the stern and the outboard propulsion device at the start of sliding (see, for example, Patent Document 1, Patent Document 2, and Patent Document 3).
JP 57-60995 A US Pat. No. 4,756,265 specification US Pat. No. 5,645,009

The invention disclosed in Patent Document 1 has a configuration in which a cavitation plate and a splash plate are provided above a propeller of a lower casing of an outboard propulsion device, and an acceleration plate is attached above this.
The acceleration plate protrudes to the left and right of the lower casing, has a small amount of protrusion at the front portion, a large amount of protrusion at the rear portion, and is constituted by two flat plate bodies on the left and right sides.
The invention disclosed in Patent Document 2 is configured to include hydrofoil wings that extend rearward from the rear portion of the propeller and extend to the left and right of the propeller.
In the invention disclosed in Patent Document 3, a deflector plate is attached to a mounting plate via a hinge, and the angle can be adjusted by a control rod that is expanded and contracted by a hydraulic actuator.

  In the invention of Patent Document 1, the acceleration plate made of the left and right plate members has a recess 23 at the center, which reduces the effective area of the acceleration plate to obtain lift, which is disadvantageous in obtaining effective lift. The acceleration play is installed at a position directly above the cavitation plate and close to the top of the propeller, and the lift generation center is relatively at the same position as the propeller (propeller), so that the lift effect is small.

In the invention of Patent Document 2, since the hydrofoil for obtaining lift extends from the rear part to the rear of the propeller and extends to the left and right of the propeller, the lift generation center is relatively a propulsion device as in the invention of Patent Document 1. Since it is in the same position as the (propeller), there are disadvantages that the lift effect is small and the lateral width cannot be increased in consideration of the drag force when the hydrofoil slides.
Further, in the invention of Patent Document 3, since the mounting plate is at the same height as the cavitation plate, the deflector plate needs to be movable in consideration of the drag force during sliding, and the structure of the movable structure of the wing, the drive source, etc. Is complicated.
The present invention has been made to solve the above problems.

  The present invention relates to an outboard propulsion device attached to a boat, which is very quickly and smoothly lifted upward by a lift generating plate at the start of sliding, and hulls that slide in an extremely short time. The outboard propulsion device is provided so that the attitude of the boat can be made to be almost horizontal, and the boat can be quickly and smoothly shifted to the high speed sliding of the boat to which the outboard propulsion device is attached. It is an object of the present invention to provide an outboard propulsion device that enables the lift generating plate to come out on the water during sliding, prevents the drag of water during sliding, and realizes this simply.

The invention according to claim 1 is the outboard propulsion device attached to the tail of the hull, wherein the front end is located behind the rear edge of the lower unit of the outboard propulsion device and has a continuous surface in the left-right direction. The plate is arranged behind the lower unit and above the anti-cavitation plate protruding from the left and right of the lower unit, and the lift generating plate is attached to the left and right stays via the left and right brackets attached to both sides of the lower unit. The left and right stays are plate-like, and the left and right stays are tilted rearward and have a substantially L-shaped side view. The lift generating plate has its lower surface at the top of the left and right stays. It is characterized by being fixedly integrated with the edge .
According to a second aspect of the present invention, the lift generating plate according to the first aspect of the present invention is arranged so that the length in the left-right direction is larger than that in the front-rear direction, the rear end portion is lower and the front end portion is higher, and the rear end is inclined downward. And has a wing-shaped cross section.

In the invention according to claim 1, the lift generating plate effectively lifts the outboard propulsion device at the start of sliding, and the outboard propulsion device and the stern can be quickly and smoothly in a short time. The lift can be lifted upward by the lift generating plate, and the attitude of the sliding hull can be made almost horizontal.
In particular, in the present invention, the lift generating plate provided in the outboard propulsion device is disposed behind the lower unit so that the front edge is located behind the rear edge of the lower unit of the outboard propulsion device, and the lower unit Since it is located above the anti-cavitation plate that protrudes to the left and right, the outboard propulsion device is lifted, and after the sliding state, the lift generating plate comes out on the water and is not affected by the drag caused by water .
In the present invention, the lift generating plate can be configured as a fixed type, and the structure can be simply configured. Further, the present invention can easily increase the size of the lift generating plate. In addition, an outboard propulsion device having a high lift-up effect can be easily obtained.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.
FIG. 1 is a side view of an outboard propulsion device according to a first embodiment of the present invention, and FIG. 2 is an external perspective view of the outboard propulsion device viewed from the front.
The outline of the outboard propulsion apparatus will be described with reference to this drawing.
The outboard propulsion apparatus 1 is an outboard motor that includes an uppermost engine cover 2, an under cover 3 below, an extension case 4 below, and a gear case 5 below. In the embodiment, the extension case 4 and the gear case 5 constitute a lower unit and are formed of a light metal such as an aluminum alloy.

The engine cover 2 accommodates an engine 6 composed of a vertical engine with a crankshaft and a camshaft arranged vertically, and the engine 6 is a multi-cylinder engine in which a plurality of cylinders whose axis is directed to the side are arranged vertically.
The engine 6 has an engine head 6a including a cylinder head and a head cover on the rear side of the outboard propulsion device 1, and an engine body 6b including a cylinder block and a crankcase on the intermediate side. The lower part of the engine 6 faces the under cover 3. . Inside the under cover 3, a bottom portion 6c of the engine main body is faced, and a mount case 7 having an oil pan inside is disposed below the bottom portion 6c. The operation is controlled by a throttle valve 6f or the like.

A longitudinal drive shaft 6e passes through the bottom portion 6c of the under cover 3 and the mount case 7, and extends vertically through the upper part of the extension case 4 and the gear case 5. The gear mechanism in the gear box 5a provided in the middle portion of the gear case 5 by the drive shaft 6e. A propeller 8 that generates a propulsive force is coupled to the rear end portion of the shaft output shaft 5b driven by the gear mechanism 5c to constitute a propulsion unit.
A longitudinal recess 1a is provided on the front side of the outboard propulsion apparatus 1, and the recess 1a is provided over the lower half of the front portion of the under cover 3 and the front portion of the extension case 4. The swivel case 9 and the stern bracket 10 are provided in the recess. The outboard propulsion device moves up and down (tilt) by the stern bracket 10. The outboard propulsion device is attached to the stern of the hull through the stern bracket 10 as described above.

At the lower part of the outboard propulsion device 1 above the propeller 8, the anti-cavitation plate 11 is provided so as to protrude in the form of a flange on the front side and on both sides of the propeller 8. The anti-cavitation plate 11 is provided so as to be over the propeller 8. A line P1 indicates a height plane of the anti-cavitation plate 11 and is equal to the height of the bottom of the hull.
An anti-splash plate 12 is provided above the anti-cavitation plate 11 so as to be spaced apart, and the anti-splash plate 12 protrudes in a flange shape from the front portion in the front-rear direction of the outboard propulsion device 1 to both sides of the intermediate portion. Provide.

In the embodiment, the anti-cavitation plate 11 and the anti-splash plate 12 are provided at the lower part of the extension case 4 above the gear case 5 and at the lower end part of the upper part of the gear box 5a.
In the drawing, reference numeral 13 denotes a shift rod which passes through the under cover 3 and the lower unit 4 and engages with the clutch body of the gear mechanism 5c in the gear case 5.

The outboard propulsion device 1 is provided with a lift generating plate 20.
The state of attachment of the lift generating plate 20 to the outboard propulsion device 1 is as shown in the external side view of the outboard propulsion device of FIG. 1 and the perspective view of FIG. 2, and the single unit of the lift generating plate 20 is shown in FIGS. As shown in
2 is a perspective view of the main body portion of the lift generating plate 20, FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. 3, and FIG. 5 is a plan view showing an example of attachment to the outboard propulsion device 1. It is a figure.

The lift generating plate 20 includes a plate-like main body 21 having a little length in the front-rear direction extending in the left-right direction, and the plate-like main body 21 has a large length in the left-right direction. The length of the plate-shaped main body 21 in the left-right direction is sufficiently larger than the width in the left-right direction of the lower housing 4 of the outboard propulsion device 1 as shown in FIG.
In the embodiment, as shown in the sectional view of FIG. 4, the rear end portion 22 is thin and tapered, the wing-like cross section is thick from the intermediate portion 23 to the rear portion 24, and the front end portion 25 is thin, In the embodiment, the front end portion 25 is thicker than the rear end portion 22, the upper surface 21 a constitutes a gentle convex curved surface upward, and the lower surface 21 b slightly dives the rear half upward and the front half gently downward. Is protruding. For example, the width on the left and right is 500 mm, and the length on the front and rear is 300 mm to 350 mm.

The plate-like main body 21 of the lift generating plate 20 described above is disposed so as to be tilted backward and rearward, with the rear end portion 22 being a lower position and the front end portion 25 being an upper position.
Blade end plates (side end plates) 27 and 27 are fixed to both side end portions 26 and 26 of the plate-like main body 21 described above, and the blade end plates 27 and 27 are formed of a plate-like body having a large area. The side view has a shape similar to a triangle with substantially rounded corners.
The blade end plates 27 and 27 are attached to both end portions 26 and 26 in a state where the blade end plates 27 and 27 are inclined rearwardly following the plate-like main body 21, and the front and rear end edge portions 27 a and 27 b are the front and rear end edge portions 25 and 25 of the plate-like main body 21. It protrudes slightly forward and backward than 24.
The blade end plates 27 and 27 are arranged in parallel in the front-rear direction.

The lift generating plate 20 is supported by left and right mounting stays 30 and 30. The left and right mounting stays 30, 30 are formed of thick, long and thin plates that are long in the front-rear direction.
As shown in FIG. 1, the mounting stays 30, 30 are substantially L-shaped with an obtuse side view, and the upper end edges 32 of the rear half portions 31 tilted rearward are fixed to the left and right sides of the lower surface 21 b of the plate-like body 21. The fixed portion is a portion spaced from the inner side of the blade end plates 27, 27 by a predetermined distance. The left and right mounting stays 30, 30 are spaced apart by a predetermined distance in the left-right direction, and the left and right mounting stays 30, 30 are parallel to each other. And it extends in the front-rear direction.
The front half portions 33 of the left and right mounting stays 30, 30 extend in the front-rear direction, extend in a substantially straight line, extend in the horizontal direction, and are made of a thick material having a length in the front-rear direction inside each front half portion 33. The brackets 40 and 40 are fixed.

The mounting brackets 40, 40 are short in the vertical direction and long in the front-rear direction and are linear in side view, and in plan view, the front-rear direction intermediate portion 43 is bent inwardly symmetrically as shown in FIG. Are provided with projecting boss portions 44, 44 on both sides of the lower unit 4 of the outboard propulsion device 1 so as to be separated from each other in the front-rear direction. Alternatively, the mounting boss portion may be configured to sandwich a spacer as a back boss.
The rear end portion 41 and the rear portion 42 of each of the mounting brackets 40, 40 are flat surfaces, and the bolts 50 (... are plural in the lower portion of the rear half portion 31 and the rear half portion 33 of the mounting stays 30, 30 described above. The mounting stays 30 and 30 and the mounting brackets 40 and 40, which are fixed to each other by the same method, are attached to and supported by the rear end.

The mounting brackets 40, 40 are fixedly coupled to the outer surface of the rear half of the lower unit 4 of the outboard propulsion apparatus 1 with bolts 50, etc. via the mounting boss portions 44, 44, for example.
Further, in the embodiment, the front end portions 45 of the mounting brackets 40, 40 are fixed to the boss portions 4a, 4a projecting on both side portions of the lower unit 4 through bolts 50, 50, etc.
As described above, the lift generating plate 20 is attached and supported so as to protrude rearward from the rear portion of the lower unit 4 in the lower half of the outboard propulsion device 1.

  The attachment of the lift generating plate 20 to the outboard propulsion device 1 is not limited to the above-described structure, and is optional, and in the embodiment, the attachment stay of the lift generating device is attached to the outboard propulsion device via a mounting bracket. Although supported, a mounting stay that also serves as a mounting bracket may be provided integrally or integrally protruding rearward from the outboard motor side, and the lift generating device may be attached to the mounting stay protruding rearward of the outboard propulsion device.

In the above description, the lift generating plate 20 is located at the rear of the lower unit 4 of the outboard propulsion apparatus 1 as shown in FIG. 1, and specifically, the rear edge 4 b of the lower unit 4. The front edge portion 25 of the plate-like main body 21 is positioned behind the front edge portion 27, and the front edge portion 27 a of the blade end plate 27 is positioned.
Further, the lift generating plate 20 is positioned above the anti-cavitation plate 11 of the outboard propulsion apparatus 1, that is, the plate-like main body 21 and the blade end plate 27 are positioned above the anti-cavitation plate 11.
In the drawing, reference numeral 14 denotes a decorative cover that covers the rubber bush mounting portion that elastically supports the swivel case / swivel case on the outboard propulsion device 1 side.

In the above, the hull to which the outboard propulsion device 1 is attached has a heavy stern when the ship is stopped, and the lower half including the lower unit 4 of the outboard propulsion device 1 is submerged. The provided lift generating plate 20 is also substantially horizontal or slightly inclined downward and submerged. The water surface is indicated by a chain line A in FIG.
The propeller 8 rotates and propels by the operation and driving of the outboard propulsion apparatus 1, but the rear portion further falls and a chain line B state immediately after the start of acceleration of the outboard propulsion apparatus 1.
By continuing the acceleration, the stern including the outboard propulsion device 1 is lifted by the drag of the plate-like main body 21 of the lift generating plate 20.

  In the sliding state, the water surface is at the position of the anti-cavitation plate 11 as indicated by the chain line C. At this time, the lift generation plate 20 is positioned above the anti-cavitation plate 11, so that in the sliding state, the water surface is exposed on the water and the drag of water. And can run at high speed.

  The outboard propulsion apparatus according to the present invention is suitable for mounting a stern of a boat.

It is a side view of an outboard propulsion device concerning an embodiment of the invention. It is the external appearance perspective view of the outboard propulsion device seen from the front. It is a perspective view of the main-body part of a lift generation board. FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. It is a top view and is a figure showing an example of attachment to outboard propulsion device 1.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Outboard propulsion apparatus, 4 ... Lower unit, 4b ... Rear edge of lower unit, 11 ... Anti-cavitation plate, 20 ... Lift generating plate, 21 ... Plate-like main body of lift generating plate, 21b ... Lower surface, 22 ... Rear end parts, 25 ... front end, 30 ... stay, 31 ... rear half portion, 32 ... upper edge, 40 ... bracket.

Claims (2)

In the outboard propulsion device attached to the tail of the hull,
A lift generating plate (20) having a front end portion (25) located behind the rear edge (4b) of the lower unit (4) of the outboard propulsion device and having a continuous surface in the left-right direction is connected to the lower unit (4 ) And above the anti-cavitation plate (11) projecting to the left and right of the lower unit (4) ,
The lift generating plate (20) is connected to the outboard propulsion device (1) side by left and right stays (30, 30) via left and right brackets (40, 40) attached to both side portions of the lower unit (4). Mounted and supported,
The left and right stays (30, 30) are formed of a plate-like body, and the rear side portion (31) has a substantially L-shape when viewed from the side.
The lift generating plate (20) has its lower surface (21b) fixedly integrated with upper end edges (32, 32) of the left and right stays (30, 30).
An outboard propulsion device characterized by that. The lift generating plate (20) has a length in the left-right direction larger than that in the front-rear direction, the rear end (22) is lower, and the front end (25) is higher and rearwardly inclined, 2. The outboard propulsion apparatus according to claim 1, wherein the outboard propulsion apparatus has a wing-shaped cross section.

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