JP5817465B2 - Outboard motor cooling channel structure - Google Patents

Description

  The present invention relates to a cooling water channel structure for an outboard motor suitable for taking in water from the water outside the outboard motor.

  As an outboard motor cooling channel structure, for example, in an outboard motor disclosed in Patent Document 1, a main water inlet is provided on a side surface of a gear case, and water is guided from the main water inlet to the main water channel. Further, a water reservoir chamber is formed in a portion of the gear case located above the propeller so that water is guided from the water reservoir chamber to the main water channel through a pipe. Thereby, even when the main water intake port is blocked by algae or the like in the water, it is possible to compensate for an insufficient intake amount of cooling water taken from the main water intake port in order to cool the engine.

Japanese Utility Model Publication No. 61-55000

  In the outboard motor disclosed in Patent Document 1, a pipe for guiding water from the water reservoir chamber above the propeller to the main water channel is installed. However, considering the arrangement of a water supply port different from the main water supply port at a location different from the upper part of the gear case propeller, it is necessary to install a pipe or water channel for guiding water from there to the main water channel. It can be difficult.

  Moreover, in the outboard motor disclosed in Patent Document 1, the pipe from the water reservoir chamber is arranged substantially perpendicular to the main water channel. Therefore, the water flow flowing through the main water channel is disturbed by the water flow derived from the pipe, and there is a concern that the water supply efficiency is lowered.

  The present invention has been made in view of the above points, and aims to increase the water supply efficiency while ensuring the degree of freedom of layout when arranging one water intake section and another water intake section. To do.

An outboard motor cooling channel structure according to the present invention is an outboard motor cooling channel structure in which a drive shaft and a propeller shaft are connected via a gear in a lower casing, and is provided on the left and right sides of the lower casing. A first water intake portion configured to form a space for taking in water, a cooling water passage for guiding water in the space of the first water intake portion to a cooling water pump, and the lower casing, A second water intake portion disposed in front of the first water intake portion, a left cooling water passage that communicates the second water intake portion with the space of the left first water intake portion, and the second water intake portion. A right cooling water channel that communicates the water intake portion with the space of the first water intake portion on the right side, and the water taken in the space of the first water intake portion by the first water intake portion is Taking in the first flow path leading to the cooling water path and the second water intake section Water is separated into a second flow path for guiding the cooling water channel, characterized in that the arrangement for combining with the cooling water channel.
Another feature of the cooling water channel structure of the outboard motor of the present invention is that the outlet side from the first channel to the cooling channel and the outlet channel from the second channel to the cooling channel. On the side, the two water flows are substantially parallel.
Another feature of the cooling water channel structure of the outboard motor according to the present invention is that the outlet position of the second flow channel with respect to the cooling water channel is greater than the outlet position of the first flow channel with respect to the cooling water channel. Is located on the downstream side of the cooling water channel.
Another feature of the cooling water channel structure for an outboard motor according to the present invention is that the first water intake portion includes a water intake port formed in a concave shape in the lower casing, and the water intake portion. A cover having a filter function attached to the inlet, and a rib for separating the first flow path and the second flow path is provided in either the water intake port or the cover. There is in point.
Another feature of the cooling water channel structure of an outboard motor according to the present invention is that the lower casing has a gear case portion arranged to form a bullet shape in the front-rear direction, and the second water An intake part exists in the point arrange | positioned at the pointed end part of the said gear case part.
Another feature of the cooling water channel structure of an outboard motor according to the present invention is that the second water intake portion is disposed on the left and right of the pointed end portion of the gear case portion, and the second water intake portion on the left side. An intake portion communicates with the space of the left first water intake portion via the left cooling water channel, and the right second water intake portion communicates with the right first water intake via the right cooling water channel. The point is that it communicates with the space of the entrance.
Another feature of the cooling water channel structure of an outboard motor according to the present invention is that the first water intake portion is a side surface of the gear case portion and houses the gear in the gear case portion. It exists in the point arrange | positioned above a storage chamber.
Another feature of the cooling water channel structure of the outboard motor according to the present invention is that the left cooling water channel and the right cooling water channel overlap with the storage chamber in the gear case portion in a side view. .

  According to the present invention, the second water intake portion is connected to the space of the left first water intake portion via the left cooling water channel, and the second water intake portion is connected to the right side of the first water intake portion via the right cooling water channel. Since the first water intake portion and the second water intake portion are arranged, the degree of freedom in layout can be ensured. Moreover, in the space of the first water intake part, the first flow path for guiding the water taken in by the first water intake part to the cooling water channel and the water taken in by the second water intake part are led to the cooling water channel. Since it is separated from the second flow path and merged in the cooling water passage, the water supply efficiency can be increased by the ejector effect.

FIG. 3 is a partial cross-sectional view of the left side surface of the outboard motor according to the embodiment. It is the figure which looked at the lower unit of the outboard motor concerning an embodiment from the front. It is a perspective view which shows the structure of the main water intake part. It is a figure which shows the cover which comprises a main water intake part. It is a figure for demonstrating the positional relationship of a main water intake part, a sub water intake part, and the cooling water channel which connects them. It is sectional drawing in the position of the VI-VI line of FIG. It is sectional drawing in the position of the VII-VII line of FIG. It is a figure for demonstrating an effect | action when rocking | fluctuating an outboard motor. It is the figure which looked at the lower unit of the outboard motor concerning other embodiments from the front.

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a partial cross-sectional view of the left side surface of the outboard motor 10 according to the present embodiment. In the present application, the front, rear, left, and right directions refer to directions when the outboard motor is mounted on the hull, and the front of the outboard motor 10 is indicated by an arrow Fr and the rear is indicated by an arrow Rr as necessary.

  In the overall configuration of the outboard motor 10, the engine unit 11, the mid unit 12, and the lower unit 13 are sequentially arranged from the upper part to the lower part.

  In the engine unit 11, the engine 15 is mounted and supported in the casing 14 in a vertical position so that the crankshaft faces the vertical direction. For example, a V-type multi-cylinder engine can be used as the engine 15.

  In the mid unit 12, a drive shaft 17 connected to the crankshaft of the engine 15 is vertically disposed in the casing 16, and the driving force of the drive shaft 17 is transmitted through the gear 22 in the lower unit 13. It is transmitted to the shaft 18. The mid unit 12 is provided with an oil pan for storing oil for lubricating the engine unit 11.

  In the lower unit 13, the casing 19 has a gear case portion 20 disposed so as to have a bullet shape in the front-rear direction, and the propeller shaft 18 and the propeller 21 are driven to rotate in the accommodation chamber 20 a in the gear case portion 20. A plurality of gears 22 and the like are accommodated. The drive shaft 17 extending downward from the mid unit 12 engages with the gear 22 in the accommodation chamber 20a by a gear attached to itself, thereby rotating the propeller shaft 18 and finally rotating the propeller 21. Further, the gear case portion 20 is operated by a shift rod composed of an upper shift rod (not shown) extending up and down from the engine 15 side and a lower shift rod 23 inserted and supported vertically on the tip end side of the gear case portion 20. The power transmission path of the internal gear device is switched, that is, shifted.

  The outboard motor 10 thus configured is supported by the bracket 24 so as to be able to swing left and right and is fixed to the rear plate of the hull so that it can be rotated around the tilt shaft 25 in the vertical direction.

Hereinafter, the cooling water channel structure of the outboard motor 10 according to the present embodiment will be described.
FIG. 2 is a view of the lower unit 13 as viewed from the front. The casing 19 of the lower unit 13 corresponds to the lower casing referred to in the present invention, and has an anti-splash plate 26 and an anti-cavitation plate 27 that are arranged vertically near the mating surface with the mid unit 12. And the gear case part 20 arrange | positioned so that a bullet shape may be exhibited in the front-back direction is provided in the lower part of the leg part 28 extended below. As shown in FIGS. 6 and 7, a housing chamber 20 a that houses a plurality of gears 22 that rotationally drive the propeller shaft 18 and the propeller 21 is formed in the gear case portion 20.

  As shown in FIG. 1, a cooling water pump 29 is attached so as to be attached to the drive shaft 17 on the upper surface of the casing 19 of the lower unit 13. The cooling water pump 29 is driven by the rotation of the drive shaft 17 to take in water from the water outside the outboard motor 10 and supply the cooling water to the engine unit 11 side.

  Here, main water intakes 30 </ b> L and 30 </ b> R are formed on the left and right sides of the casing 19 at positions where the gear case portion 20 is connected to the leg portions 28. As shown in FIG. 3, covers 31L and 31R are attached to the main water intakes 30L and 30R, respectively. FIG. 4 shows the cover 31L. A filter is provided in the water intake holes 39 formed in a large number in the covers 31L and 31R, and has a filter function against foreign substances and the like. The main water intakes 30L and 30R are formed in a concave shape inside, and the covers 31L and 31R are attached so as to close the main water intakes 30L and 30R, respectively. Main water intake portions 32L and 32R corresponding to the input portions are configured. That is, the main water intake portions 32L and 32R are configured such that the covers 31L and 31R and the main water intake ports 30L and 30R are combined to form a space for taking in water.

  In this embodiment, when the covers 31L and 31R are assembled to the main water intake ports 30L and 30R, the boss portions 34L and 34R provided on the covers 31L and 31R come into contact with each other. In this state, both covers 31L and 31R are fixed by fastening the boss portions 34L and 34R together with bolts (not shown).

  As shown in FIG. 1, the main water intake portions 32L and 32R are disposed between the drive shaft 17 and the lower shift rod 23 in a side view. In the casing 19, a cooling water passage 33 extending vertically is formed between the drive shaft 17 and the lower shift rod 23 in a side view, and the main water intake portions 32 </ b> L and 32 </ b> R and the cooling water pump 29 are formed by the cooling water passage 33. Are connected.

  Further, sub water intakes 35L and 35R are formed on the left and right of the pointed end of the gear case portion 20, respectively. The sub water intakes 35L and 35R are also formed in a concave shape on the inside, and covers 36L and 36R having a filter function against foreign substances or the like are attached to the sub water intakes 35L and 35R, which corresponds to the second water intake portion in the present invention. The sub water intake parts 37L and 37R are configured. That is, the sub water intake portions 37L and 37R are configured such that the covers 36L and 36R and the sub water intake ports 35L and 35R are combined to form a space for taking in water.

  3, 5, and 6, the left side cooling water passage 38 </ b> L that communicates the left sub water intake portion 37 </ b> L to the space of the left main water intake portion 32 </ b> L on the left side in the gear case portion 20. Is formed. Similarly, a right cooling water passage 38R that connects the right sub water intake portion 37R to the space of the right main water intake portion 32R is formed on the right side in the gear case portion 20. Since the main water intake portions 32L and 32R are disposed on the side surfaces of the gear case portion 20 and above the storage chamber 20a, the sub water intake portions 37L and 37R are disposed at the pointed ends of the gear case portion 20. The cooling water passages 38L and 38R are formed so as to rise rearward in a side view. In this case, the left cooling water channel 38L and the right cooling water channel 38R overlap with the storage chamber 20a in a side view, but interfere with the storage chamber 20a as independent water channels that pass through the left and right sides of the storage chamber 20a. I try to avoid that.

Here, the ribs 40 are integrally formed inside the covers 31L and 31R of the main water intake portions 32L and 32R, and the space of the main water intake portions 32L and 32R serves as the first flow path F ₁ and the second flow. It is separated into a road F _2. As shown in FIG. 5, the first flow path F ₁ is a flow path that connects the water intake hole 39 to the cooling water channel 33, and guides the water taken in the water intake hole 39 to the cooling water channel 33 (FIG. 5). see arrow W ₁ of). On the other hand, the second flow path F ₂ is a flow path that connects the outlets of the cooling water passages 38L and 38R to the cooling water passage 33, and guides the water taken in by the sub water intake portions 37L and 37R to the cooling water passage 33 (FIG. 5). (See arrow W ₂ ). That is, the water taken in by the water intake holes 39 of the main water intake portions 32L and 32R and the water taken in by the sub water intake portions 37L and 37R are separately led to the cooling water channel 33 and merged in the cooling water channel 33. In the present embodiment, in the second flow path F ₂ , the ribs 40 are curved so that the water led out from the outlets of the cooling water passages 38L and 38R flows substantially in parallel and then rises to reach the cooling water passage 33. ing. As shown in FIG. 4, it goes without saying that the water intake holes 39 formed in the covers 31L and 31R are arranged only on _one side of the rib 40, that is, on the first flow path F1 side.

When the rib 40 separates the _first channel F ₁ and the second channel F ₂ , as shown in FIG. 5, the outlet side from the _first channel F ₁ to the cooling water channel 33, On the outlet side from the flow path F ₂ to the cooling water path 33, both water flows W ₁ and W ₂ are made substantially parallel to each other.

As shown in FIG. 5, the main water intake portions 32L and 32R are formed so as to rise rearward in a side view, and are connected to the cooling water channel 33 at the rear portion. And the edge part of the rib 40 is extended to the position where the space of the main water intake parts 32L and 32R communicates with the cooling water channel 33. Accordingly, the outlet position F _2out of the second flow path F ₂ with respect to the cooling water path 33 is located downstream of the cooling water path 33 relative to the outlet position F _{1out of} the first flow path F ₁ with respect to the cooling water path 33. Become. Incidentally, to extend so as to protrude to the inside more cooling water channel 33 the end of the rib 40, the second flow path F ₂ exit location F _2out is than the first flow path F ₁ exit location F _1out Alternatively, it may be located downstream of the cooling water channel 33.

In the cooling water channel structure of the outboard motor as described above, the sub water intake portions 37L and 37R are located on the upstream side and the main water intake portions 32L and 32R are located on the downstream side with respect to the water flow during the hull traveling. Then, the left sub water intake portion 37L is connected to the space of the left main water intake portion 32L via the left cooling water passage 38L, and the right sub water intake portion 37R is connected to the right main water passage via the right cooling water passage 38R. It leads to the space of the intake part 32R. With this configuration, when the cooling water pump 29 is driven by the rotation of the drive shaft 17, water is taken in from the water intake holes 39 of the main water intake portions 32 </ b> L and 32 </ b> R and is passed through the first flow path F ₁ and the cooling water path 33. The cooling water can be supplied to the engine unit 11 side. Further, water is taken in from the sub water intake portions 37L and 37R, introduced into the space of the main water intake portions 32L and 32R via the cooling water passages 38L and 38R, and then passed through the second flow passage F ₂ and the cooling water passage 33. Cooling water can be supplied to the engine unit 11 side.
In this way, the left sub water intake portion 37L is connected to the space of the left main water intake portion 32L via the left cooling water passage 38L, and the right sub water intake portion 37R is connected to the right side of the right main water intake portion 38R via the right cooling water passage 38R. By adopting two systems connected to the space of the main water intake portion 32R, it is not necessary to install pipes or water passages that directly lead water from the sub water intake portions 37L and 37R to the cooling water passage 33, and to ensure flexibility in layout. be able to.

Further, when the water taken in by the sub-water intake portions 37L and 37R flows out from the second flow path F ₂ to the cooling water path 33, an ejector effect is produced, contributing to the water supply from the _first flow path F ₁ and water supply. Efficiency can be increased. Particularly in the high speed range, the dynamic pressure increases at the sub water intake portions 37L and 37R at the tip of the gear case portion 20, and the ejector effect is enhanced. In this case, as described above, the water flow W ₁ between the first flow path F ₁ and the outlet side from the second flow path F ₂ to the cooling water path 33 is the same as that described above. , by so W ₂ is substantially parallel, it is possible to enhance the ejector effect. Further, the outlet position F _2out of the second flow path F ₂ with respect to the cooling water path 33 is positioned downstream of the cooling water path 33 with respect to the outlet position F _{1out of} the first flow path F ₁ with respect to the cooling water path 33. The ejector effect can be enhanced.

And by making the cooling water channel structure into two systems, damage can be suppressed to the minimum with respect to water supply abnormality. For example, as shown in FIG. 8, when the outboard motor 10 is swung to the left or right during steering, it becomes difficult to take in water in one of the main water intake portions 32L and 32R. In the illustrated example, the left main water intake portion 32L facing the water flow (see arrow S) can efficiently take in water, but the right main water intake portion 32R located on the back side with respect to the water flow can efficiently supply water. Cannot be imported. Also in this case, since water can be taken in from the sub water intake parts 37L and 37R, the shortage of water can be compensated.
Further, for example, even if one of the left main water intake part 32L and the sub water intake part 37R is clogged with foreign matter in the water, water can be taken in from the other, so that the shortage of the water amount is compensated. Can do. The same applies to the main water intake portion 32L and the sub water intake portion 37R on the right side.

  Moreover, water supply efficiency can be improved by dynamic pressure by arrange | positioning the sub water intake parts 37L and 37R in the pointed part of the gear case part 20. FIG. In particular, in the high speed range, the main water intake portions 32L and 32R on the side surface of the casing 19 are affected by the separated water flow and the water supply efficiency is lowered. As a result, the water supply efficiency reaches its peak, so that it is possible to avoid a decrease in the water supply efficiency in the high speed range.

  As mentioned above, although this invention was demonstrated with various embodiment, this invention is not limited only to these embodiment, A change etc. are possible within the scope of the present invention. For example, in the said embodiment, although demonstrated so that the sub water intake parts 37L and 37R mutually independent on the right and left of the pointed part of the gear case part 20 were comprised, as shown in FIG. Alternatively, one sub water intake part 37 may be configured. In this case, a left cooling water passage 38L that connects the sub water intake portion 37 to the left main water intake portion 32L and a right cooling water passage 38R that connects the sub water intake portion 37 to the right main water intake portion 32R are formed. Is the same as in the above embodiment. In addition, when providing the one sub water intake part 37 in the pointed part of the gear case part 20, it arrange | positions so that the sub water intake part 37 may straddle right and left of the pointed part of the gear case part 20, as shown in FIG. Is preferred.

  In the above embodiment, the rib 40 is formed integrally with the covers 31L, 31R of the main water intake portions 32L, 32R. However, the ribs are formed integrally with the main water intake ports 30L, 30R, that is, the casing 19. It may be. However, when the casing 19 is formed by aluminum die casting and the covers 31L and 31R are formed by resin injection, the draft is greatly different between the two, so that forming the ribs integrally with the covers 31L and 31R makes the ribs thinner, etc. It can be said that the degree of freedom of design is high.

  10: Outboard motor, 11: Engine unit, 12: Mid unit, 13: Lower unit, 17: Drive shaft, 18: Propeller shaft, 19: Casing, 20: Gear case section, 20a: Storage chamber, 22: Gear, 29: Cooling water pump, 30L, 30R: Main water intake port, 31L, 31R: Cover, 32L, 32R: Main water intake portion, 33: Cooling water channel, 35L, 35R: Sub water intake port, 36L, 36R: Cover, 37L, 37R: Sub water intake part, 38L, 38R: Cooling water channel, 39: Water intake hole, 40: Rib

Claims (8)

A cooling water channel structure of an outboard motor in which a drive shaft and a propeller shaft are connected via a gear in a lower casing,
A first water intake portion provided on the left and right sides of the lower casing and configured to form a space for taking in water;
A cooling water channel for guiding water in the space of the first water intake portion to a cooling water pump;
A second water intake portion provided in the lower casing and disposed in front of the first water intake portion;
The left cooling water channel that communicates the second water intake part with the space of the left first water intake part, and the right side that communicates the second water intake part with the space of the right first water intake part. A cooling water channel,
A space of the first water intake portion includes a first flow path for guiding water taken in by the first water intake portion to the cooling water passage, and water taken in by the second water intake portion in the cooling water passage. A cooling water channel structure for an outboard motor, wherein the cooling water channel structure is separated into a second flow channel leading to the first flow channel and merged with the cooling water channel.   The flow of both water is substantially parallel between the outlet side from the first channel to the cooling channel and the outlet side from the second channel to the cooling channel. The cooling water channel structure of the outboard motor according to 1.   3. The outlet position of the second flow path with respect to the cooling water channel is located on the downstream side of the cooling water channel with respect to the outlet position of the first flow channel with respect to the cooling water channel. 4. The cooling water channel structure of the outboard motor described in 1. The first water intake portion is constituted by a water intake port formed in a concave shape in the lower casing, and a cover having a filter function attached to the water intake port,
The rib for separating into the said 1st flow path and the said 2nd flow path is provided in either the said water intake or the said cover, The any one of Claim 1 thru | or 3 characterized by the above-mentioned. The cooling water channel structure of the outboard motor as described in the paragraph. The lower casing has a gear case portion arranged so as to exhibit a bullet shape in the front-rear direction,
5. The outboard motor cooling water channel structure according to claim 1, wherein the second water intake portion is disposed at a pointed end portion of the gear case portion.   The second water intake portion is disposed on the left and right of the pointed end portion of the gear case portion, and the left second water intake portion passes through the left cooling water channel and is a space of the left first water intake portion. 6. The outboard motor according to claim 5, wherein the right second water intake portion is communicated with a space of the right first water intake portion via the right cooling water channel. Cooling channel structure.   The said 1st water intake part is a side surface of the said gear case part, Comprising: It is arrange | positioned above the storage chamber which accommodates the said gear in the said gear case part. Cooling channel structure for outboard motors.   The outboard motor cooling water channel structure according to claim 7, wherein the left cooling water channel and the right cooling water channel overlap the storage chamber in the gear case portion in a side view.

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