JP2008201220A - Outboard propulsion unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an outboard propulsion unit preventing mutual interference of outboard propulsion units in steering while ensuring effective lift when mounted on a boat, the plurality of outboard propulsion units each provided with a lift generation plate and performing a transfer to a smooth sliding by upwardly lifting a ship propeller when the boat starts to slide from anchoring. <P>SOLUTION: This outboard propulsion unit 1 mounted on the stern of a hull by a mounting device is provided with the lift generation plate 20 arranged rearward of the lower unit 4 of the outboard propulsion unit 1 and above an anti-cavitation plate, having ends overhung and projecting in the lateral direction of the lower unit. The overhang of the ends of the lift generation plate in the lateral direction of the lower unit is asymmetrically set such that the degree of overhang on one side is made large and the degree of the overhang on the other side is made small. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention, when starting to slide from the stop state, when the boat propulsion device is lifted upward and a plurality of outboard propulsion devices equipped with a lift generating plate that can shift to smooth sliding are mounted on the boat, The present invention relates to an outboard propulsion device that can prevent mutual interference between the outboard propulsion devices during steering.

A boat that slides with an outboard propulsion device (outboard motor) is not slid or at the start of a skate, when the stern descends and sinks into the water. It is an oblique state in which it is inclined downward after being lowered, and when it starts to slide, it starts to slide in such an 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-A-57-60995. 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 from the rear to the rear of the propeller and 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. Since 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), 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.

In the outboard propulsion apparatus provided with the lift generating plate described above, the amount of protrusion (projection amount) of the lower case of the outboard propulsion apparatus of the lift generating plate to the left and right is approximately the same and protrudes symmetrically.
Therefore, when two outboard propulsion devices are hung on the stern of a boat, the left and right portions of the lift generating plate interfere with each other at the time of turning, and the turning may be restricted.
In order to avoid interference during steering, it is necessary to mount the two outboard propulsion devices apart from each other, and the mounting portion of the outboard propulsion device to the stern must be changed. Inconvenience such as change occurs. Moreover, the space | interval of the left and right of the outboard propulsion apparatus with which it mounts becomes large, and it has an influence on a propulsion effect.
Furthermore, in order to avoid interference at the time of turning, if it is attempted to suppress the amount of the left and right extension of the lift generating plate to a small extent, there is a possibility that a problem arises that it is difficult to obtain sufficient lift.
The present invention has been made to solve the above problems.

  The present invention, when starting to slide from the stop state, when the boat propulsion device is lifted upward and a plurality of outboard propulsion devices equipped with a lift generating plate that can shift to smooth sliding are mounted on the boat, It is an object of the present invention to provide an outboard propulsion device that prevents mutual interference between the outboard propulsion devices at the time of turning and can achieve this while ensuring effective lift.

  The invention according to claim 1 is an outboard propulsion device that is attached to the tail of the hull by an attachment device, and is disposed behind the lower unit of the outboard propulsion device and above the anti-cavitation plate, A lift generating plate is provided so that the protruding portion protrudes and the left and right ends of the lower end of the lift generating plate are left and right asymmetric so that one projecting amount is large and the other projecting amount is small. It is characterized by.

  The invention according to claim 2 is the outboard propulsion device attached to the rear of the hull by the attachment device, and is arranged behind the lower unit of the outboard propulsion device and above the anti-cavitation plate, and both end portions on the left and right sides of the lower unit. A lifting force generating plate and a supporting portion for supporting the lifting force generating plate on the lower unit, and a plurality of connecting portions that allow selection of a connecting position between the lifting force generating plate and the supporting portion. It is characterized by that.

  The invention according to claim 3 is the outboard propulsion device attached to the rear of the hull by the attachment device, and is arranged behind the lower unit of the outboard propulsion device and above the anti-cavitation plate, A lift generating plate and a support portion for supporting the lift generating plate to the lower unit, the lift generating plate having an attachment portion having a width larger than the width of the support portion, The mounting position between the generator plate and the support portion can be selected.

  In the invention according to claim 1, the both ends of the lift generating plate provided so that both ends protrude from the lower unit of the outboard propulsion device and above the anti-cavitation plate so as to protrude to the left and right of the lower unit. Lifting to the left and right of the lower unit is asymmetrical so that one overhang is large and the other overhang is small. The amount of protrusion to the adjacent inner side of the plate is reduced, and the interference between the opposite inner ends of the adjacent lift generation plates at the time of turning is prevented. In addition, smooth and reliable steering can be performed.

Further, in the present invention, when two outboard propulsion devices including a lift generating plate are mounted, it is possible to take a large turning angle at the time of turning without interfering with the lift generating plate, The area of the lift generating plate can be sufficiently secured by making the left and right asymmetry so that one overhang is large and the other overhang is small with respect to the width of the outboard propulsion device.
Accordingly, it is possible to obtain an outboard propulsion device having a lift generating plate with sufficient lift while setting a small amount of overhang of the lift generating plate on the side of the outboard propulsion device and securing a large turning angle.

According to a second aspect of the present invention, there is provided a lift generating plate disposed at the rear of the lower unit of the outboard propulsion device and above the anti-cavitation plate so that both ends of the lower unit protrude from the left and right sides of the lower unit, and the lift generating plate. Is provided with a plurality of coupling portions that enable selection of the coupling position between the lift generating plate and the support portion, so that the lift generating plate is connected to the outboard propulsion device. Selection of the attachment position in the width direction (left-right direction) can be arbitrarily set easily.
Therefore, when the outboard propulsion device is mounted on one aircraft, the lift generating plate protrudes (extends) the same length on both the left and right sides, and in the case of two aircraft, the connecting portion of the lift generating plate is selected. The left and right overhangs are set to be asymmetrical so that one is larger and the other is smaller, so that there is no interference between the opposing ends of the lift generating plate at the time of turning. A large turning angle can be obtained in the same manner as in the case of one aircraft while wearing the outboard propulsion device.
The above can be realized with a simple structure in which a plurality of coupling portions are provided on the lift generating plate.

In the invention according to claim 3, the lift generating plate is disposed behind the lower unit of the outboard propulsion device and above the anti-cavitation plate so that both ends of the lower unit protrude from the left and right sides of the lower unit, and the lift generating plate. And a support part for supporting the lower unit,
The lift generating plate is provided with a mounting portion having a width larger than the width of the support portion, and the mounting position of the lift generating plate and the support portion can be selected, so the mounting portion having a width larger than the width of the support portion, Selection of the attachment position in the width direction (left-right direction) to the outboard propulsion device of the lift generating plate can be arbitrarily set easily.
Therefore, when the outboard propulsion device is used as a single unit by selecting the mounting position in the width direction (left and right direction) of the lift generating plate to the outboard propulsion device by the mounting portion having a width larger than the width of the support portion. In the case of two aircraft, select the connecting part of the lift generation plate, and the extension to the left and right is larger, one is larger and the other Is set to be asymmetrical so as to be smaller, eliminates interference between opposing ends of the lift generating plate at the time of turning, and is equipped with a two-board outboard propulsion device equipped with a lift generating plate. The turning angle can be increased as with the hanging.
The above can be realized with a simple structure in which an attachment portion having a width larger than the width of the support portion is provided on the lift generating plate, and the support portion and the attachment position are selected.

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 apparatus according to an embodiment of the present invention. The outline of the outboard propulsion apparatus will be described with reference to this drawing.
The outboard propulsion device 1 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 are made of a light metal such as an aluminum alloy. The extension case 4 constitutes the lower unit.

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. . In the under cover 3, a bottom case 6c of the engine body faces, and a mount case 7 having an oil pan is disposed below the bottom 6c. The operation is controlled by a throttle valve 6d and 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 is connected to the rear end of the shaft output shaft 5b driven by the gear mechanism 5c to generate a propulsive force, thereby constituting a propulsion device.
A longitudinal recess 1a is provided on the front side of the outboard propulsion device 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.
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 a gear mechanism 5 c in the gear case 5.

  The outboard propulsion device is an outboard motor in the embodiment, but may be an outboard motor mainly including a lower unit including an extension case and a gear case.

FIG. 2 is an exploded perspective view of the lift generating plate mounting structure, and FIG. 3 is an explanatory plan view of a main part showing a mounting state of the lift generating plate.
A recess 1b is provided on the left and right sides of the recess 1a of the extension case 4 constituting the lower unit of the outboard propulsion device 1, and a mount rubber housing (not shown) provided on an attachment shaft extending from the swivel case 9 at this portion. 1c is provided symmetrically, the housing portion 1c is covered with a cover 14 from the outside, and a support member mounting portion 15 having a cover portion 15a on the outer side surface of the cover 14 at the front portion is provided on the left and right sides of the rear half portion of the extension case 4. Link.
The side surfaces of the front half of the left and right support member mounting portions 15 and the outer sides of the recesses 1b are covered with the left and right decorative covers 16, and the appearance of the front half of the extension case 14 is configured.

The rear half of the support member mounting portion 15 has an L shape with a substantially obtuse angle when viewed from the side, and connects and supports the lower portions of the left and right support members 17, 17 constituting the support portion, thereby supporting the left and right support members. The upper half portions 17 and 17 are projected rearward of the extension case 4 (see FIGS. 1 and 3).
The supporting members 17 and 17 constitute a supporting portion of the lift generating plate 20, and upper holes 17a and 17a are provided on the upper edges 17a and 17a of the supporting members 17 and 17 so as to be separated from each other in the front-rear direction. It has been.

Reference numeral 21 denotes a plate-like main body constituting the main body of the lift generating plate 20, and in the embodiment, the cross section has a wing-like cross section, has a length in the left-right direction, and the length in the front-rear direction is shorter than the length in the left-right direction. The above plate-like main body 21 has a mounting hole 22 that is spaced from side to side and back and forth at a position that is biased to one side, in the drawing, to a position that is biased to the right side, rather than a position that is laterally separated from the central portion in the left-right direction. ... with.
The plate-like main body 21 is attached to and supported by the support members 17 and 17 through the attachment holes 22 and the attachment holes 18 of the support members 17 and 17.
Side end plates 23, 23 are fixed to both left and right ends of the plate-like main body 21 extending in the left-right direction. The side end plates 23, 23 are formed of a plate-like body having a large area. The shape is similar to a hemisphere.
The wing end plates 23 and 23 are attached vertically and are attached so as to stand at right angles to the surfaces of both end portions of the plate-like main body 21.

As is clear from FIG. 3, the lift generating plate 20 has a mounting portion 22 of the supporting members 17 and 17 (indicated by the mounting hole position) of the plate-like main body 21 that is close to the right end portion on the right side. The left one is mounted and supported with a bias toward a position closer to the center than the left end.
Therefore, the lift generating plate 20 is behind the extension case 14 and protrudes (projects) largely to the left, and has little protrusion to the right.
In this way, the extension case 14 (lower unit) extending left and right at both ends of the lift generating plate 14 is asymmetrical so that one extension amount is large and the other extension amount is small.

In the present invention, the lift unit is provided with both ends projecting to the left and right of the lower unit, and the projecting of the both ends of the lift generation plate to the left and right of the lower unit is asymmetrical left and right.
This means that the lateral separation distance from the center position in the width direction (left-right direction) of the lower unit to the end position of the lift generating plate extending outside the side flange position is one side (one side) of the left and right side fences. Large and small on the other side (opposite side), the lift generating plate extending in the left-right direction behind this with respect to the center position in the width direction (left-right direction) of the lower unit, and one end side of the left and right greatly project to one side, The protrusion to the other side on the other end side is small.

4 is a rear view showing an example in which the outboard propulsion devices are 1R and 1L and two stern 31 is mounted on the stern 31 of the boat 30, and FIG. It is explanatory rear surface perspective view which shows only 1L single-piece | unit.
Outboard propulsion devices 1R and 1L mounted so as to be juxtaposed in the left and right directions are the inner surfaces facing each other, that is, the left side surface in the right outboard propulsion device 1R and the right side surface in the left outboard propulsion device 1L. The amount of overhang of the end surfaces 20a, 20a facing each of the lift generating plates 20R, 20L with respect to the opposing inner surface is reduced, and the amount of overhang of the end surfaces 20b, 20b on the outer side is increased. The amount of overhang is asymmetrical on the left and right.

FIG. 6 is a plan view of the rear part of the boat showing a state in which the outboard propulsion device is steered with two aircraft.
In the figure, the outboard propulsion devices 1R and 1L are steered in the right direction with respect to the operation axis, and the hull is propelled while being steered in the right direction. When the left and right outboard propulsion devices 1R and 1L are steered as shown in the figure, the outboard propulsion devices 1R and 1L have a small amount of protrusion to the inside of the lift generating plates 20R and 20L. Even if adjacent side surfaces of the propulsion devices 1R and 1L are close to each other, the inner ends of the lift generating plates 20R and 20L do not approach each other, and even if a large turning angle is taken, they do not interfere with each other.
Therefore, even if two outboard propulsion devices having lift generating plates are used, there is no obstacle to steering.

FIG. 7 is a perspective view showing another embodiment of the lift generating plate, and FIG. 8 is a sectional view taken along line 8-8 in FIG.
In the embodiment, the lower surfaces of the wing-like plate-like main body 21 are supported on the upper edges of the left and right support members 17, 17, the side end plates 23, 23 are fixed to both side ends, and the rear of the plate-like main body 21. An example is shown in which a sub-plate body 24 having a small length in the front-rear direction is installed to form two blades.
As described above, two lift generation plates 20 may have a blade structure, and may further have a three-blade structure. Furthermore, although it is the cross-sectional shape of a plate-shaped main body or a sub-plate-shaped body, it does not necessarily need to be a wing-shaped cross section, and a flat plate-shaped body may be sufficient.

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 extension case 4 (lower unit) of the outboard propulsion device 1 is submerged. The lift-generating plate 20 disposed behind 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 is rotated and propelled by the operation and driving of the outboard propulsion device 1, but immediately after the start of the acceleration of the outboard propulsion device 1, the rear part is further lowered to a chain line B state.
By continuing the acceleration, the stern including the outboard propulsion device 1 is lifted by the drag of the plate-like main body 21 constituting the lift generating plate 20.

In the sliding state, the water surface becomes the position of the anti-cavitation plate 11 as shown by the chain line C. At this time, the lift generation plate 20 is located above the anti-cavitation plate 11, so that the drag and sufficient thrust can be obtained, and the ship is quickly Lift the outer propulsion device 1, stern.
When the outboard propulsion device 1 lifts the stern and lifts up, the lift generating plate 20 located above the anti-cavitation plate 11 and above the extension case 4 is exposed to the water in the sliding state and receives the drag of water. No, you can run at high speed.

FIG. 9 is an exploded perspective view showing an example in which the attachment position of the plate-like main body 21 of the lift generating plate can be selected and adjusted, and FIG. 10 is a plan view of an example in which the attachment position is selected as the central portion. FIG. 12 is a plan view of an example in which the mounting position is biased to the right, and FIG. 13 is a plan view of an example in which the mounting position is offset to the left.
As shown in the figure, the plate-like main body 21 is provided with mounting holes 22 and 22 in the central part spaced apart from the left and right of the central part, and markings 22A and 22A indicating the mounting hole positions on the left side of the mounting holes 22 and 22, respectively. The markings 22B and 22B are provided on the right side.
FIG. 10 shows a state in which the plate-like main body 21 is attached to the support members 17 and 17 through the attachment holes 22 and 22 provided at equal distances from the left and right about the center line CL in the left and right direction.

Since the plate-like main body 21 is attached to and supported by the support members 17 and 17 through the attachment holes forming the attachment portions or the marked portions, as shown in FIG. The lever is formed to have a partial plate thickness and is referred to as attachment portions 21a and 21a.
The attachment portions 21a and 21a are provided on the left and right sides, and are provided so as to protrude from the lower surface of the plate-like main body 21 in consideration of appearance.

FIG. 12 shows an example in which the marking portions 22A and 22A are used as attachment portions and the plate-like main body 21 is attached to the support members 17 and 17 while being biased to the left side. FIG. 13 shows an example in which the marking portions 22B and 22B are used as attachment portions, and the plate-like main body 21 is attached to the support members 17 and 17 while being offset to the left side.
By selecting the markings 22A and 22B in this way, the lift generating plate is biased to one side to be mounted and supported, and as shown in FIG. 4 and FIG. An outboard propulsion device including a plate can be obtained.

FIG. 14 is an explanatory rear view showing an example in which three outboard propulsion devices are installed.
In this embodiment, an example in which the outboard propulsion devices 1R, 1C, and 1L are mounted on the right side, the center, and the left side of the stern 31 of the boat 30 is shown.
The lift generating plates 20R, 20L of the left and right outboard propulsion devices 1R, 1L are mounted and supported asymmetrically so that the ends protrude outwardly and do not protrude inside, as in the case of the two aircraft shown in FIG. In the outboard propulsion apparatus 1C at the center, the lift generating plate 20C is not projected to the left and right, or is small even if it exists.
Thereby, even if the three outboard propulsion devices 1R, 1C, 1L are steered in any direction, the respective lift generating plates 20R, 20C, 20L do not interfere with each other.
In this way, the outboard propulsion device may have three or more aircraft.

  The outboard propulsion device 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 a disassembled perspective view of a lift generation board attachment structure. It is explanatory drawing of the principal part which shows the attachment state of a lift generating board. It is a rear view showing an example in which two outboard propulsion devices are mounted on the stern of a boat. It is explanatory rear surface perspective view which shows only the single-piece | unit of the outboard propulsion apparatus which carries 2 units | sets on either side. It is a top view of the rear part of a boat which shows the state steered in the state which carried out 2 outboard propulsion apparatuses. It is a perspective view which shows the other Example of a lift generating board. FIG. 8 is a cross-sectional view taken along line 8-8 in FIG. 7. It is a disassembled perspective view which shows the example of attachment position selection and adjustment of the plate-shaped main body 21 of a lift generating board. It is a top view of the example which selected the attachment position as a center part. It is a longitudinal cross-sectional view of a plate-shaped main body. It is a top view of the example which shifted the attachment position to the right side. It is a top view of the example which shifted the attachment position to the left side. It is explanatory rear view which shows the example which used 3 outboard propulsion apparatuses.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Outboard propulsion apparatus, 4 ... Lower unit, 10 ... Mounting apparatus, 11 ... Anti-cavitation plate, 17 ... Support part, 20 ... Lift generating board, 22 ... Coupling part, 21a ... Mounting part.

Claims (3)

In the outboard propulsion device attached to the rear of the hull by the attachment device,
It is arranged behind the lower unit of the outboard propulsion device and above the anti-cavitation plate, and has a lift generating plate so that both end portions protrude and protrude to the left and right of the lower unit,
The overhang of the both ends of the lift generating plate to the left and right of the lower unit is asymmetric so that one overhang is large and the other overhang is small.
An outboard propulsion device characterized by that. In the outboard propulsion device attached to the rear of the hull by the attachment device,
The lift generating plate is disposed behind the lower unit of the outboard propulsion device and above the anti-cavitation plate, and both ends of the lower unit protrude from the left and right sides of the lower unit, and the lift generating plate is supported by the lower unit. With a support for
A plurality of coupling portions that enable selection of the coupling position between the lift generating plate and the support portion;
An outboard propulsion device characterized by that. In the outboard propulsion device attached to the rear of the hull by the attachment device,
The lift generating plate is disposed behind the lower unit of the outboard propulsion device and above the anti-cavitation plate, and both ends of the lower unit protrude from the left and right sides of the lower unit, and the lift generating plate is supported by the lower unit. With a support for
The lift generating plate includes an attachment portion having a width larger than the width of the support portion,
The mounting position of the lift generating plate and the support portion can be selected.
An outboard propulsion device characterized by that.

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