JP4003900B2 - Small ship - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a small vessel in which a cooling engine is mounted in a ship body and a water jet propulsion device is driven by the engine.
[0002]
[Prior art]
Some small vessels have an engine mounted in the hull, for example, and a water jet propulsion device is driven by this engine to obtain a propulsive force. Some of these engines use a water-cooled type that cools with cooling water. Since the temperature of the cooling water rises due to the cooling of the engine, for example, a water pump for indirectly cooling the cooling water of the engine, etc. Some have special equipment.
[0003]
[Problems to be solved by the invention]
As described above, when a special device such as a water pump is provided to indirectly cool the cooling water of the engine, there is a problem that the cooling device is complicated and the cost is increased.
[0004]
The present invention has been made in view of such points, and does not require a special device such as a water pump for indirectly cooling the cooling water of the engine, and provides a small boat with a simple cooling device. It is aimed.
[0005]
[Means for Solving the Problems]
In order to solve the above-described problems and achieve the object, the present invention is configured as follows.
[0006]
The invention according to claim 1, “in a small vessel in which a water-cooled engine is mounted in a ship body and a water jet propulsion device is driven by this engine,
A cooling water inlet and a cooling water outlet of the engine communicate with each other outside the engine, and a second cooling water passage covering the periphery of the first cooling water passage,
The cooling water inlet of the second coolant passage, communicated with the positive pressure of the water jet propulsion unit via a first water supply pipe,
A second water supply pipe is connected to the cooling water outlet of the second cooling water passage;
The small watercraft characterized in that the second water supply pipe communicates with a cooling water jacket provided in an exhaust manifold, and communicates with the outside of the ship through the cooling water jacket . ].
[0007]
According to the first aspect of the present invention, the second cooling water passage covering the periphery of the first cooling water passage through which the engine cooling water passes is provided, and the second cooling water passage is provided from the positive pressure portion of the water jet propulsion unit. Since the cooling water of the engine is cooled by supplying the extracted water, a special device such as a water pump for indirectly cooling the cooling water of the engine is not required, and the cooling device is simple. Moreover, water can be taken in from the positive pressure part of a water jet propulsion machine, and the water can be used for cooling an exhaust manifold.
[0008]
The invention according to claim 2 is as follows: “ The second water supply pipe is provided with an oil cooler for cooling engine oil . ].
[0009]
According to the second aspect of the invention , the oil cooler can also be cooled.
[0010]
Third aspect of the present invention, the exhaust manifold connected to the cylinder head of "the engine, causes bent downward to form said cooling water jacket around,
The second water supply tube connected to the cooling water outlet of the second cooling water passage is connected to the upper end of the cooling water jacket,
Said second cooling water passage, small watercraft as claimed in claim 1, wherein the communicating overboard through the second water supply pipe and the cooling water jacket. ].
[0011]
According to the third aspect of the present invention, the water taken out from the positive pressure portion of the water jet propulsion device is passed through the second cooling water passage to the cooling water jacket formed around the exhaust manifold connected to the cylinder head. Since it is supplied, an independent cooling device for supplying cooling water to the cooling water jacket of the exhaust manifold is not required, and the cooling device is simple. In addition, the exhaust water manifold connected to the cylinder head of the engine is bent downward and the second water supply pipe is connected to the upper end of the cooling water jacket formed around the exhaust manifold. Since the cooling water inside does not fall downward and accumulate in the cooling water jacket, even if seawater is sent from the water jet propulsion device into the cooling water jacket, the exhaust manifold can be prevented from being corroded by salt.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of a small vessel according to the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a plan view in which a portion where an engine unit and a water jet propulsion device are arranged in a small vessel, FIG. 2 is a side view of a portion where the engine portion and the water jet propulsion unit are arranged, and FIG. FIG. 4 is an exploded view showing an engine exhaust system of a small vessel.
[0013]
A steering handle 3 is provided at the center of the hull 2 of the small vessel 1. A bulkhead 4 is provided behind the hull 2, and an engine room 5 and a propulsion machine room 6 are partitioned. An engine 7 is arranged in the engine room 5, and a water jet propulsion machine 8 is arranged in the propulsion room 6.
[0014]
The water jet propulsion device 8 has a propulsion duct 10 having a suction port 9 that opens to the bottom 2a of the hull 2. An impeller housing 11 is connected to the rear of the propulsion duct 10, and the impeller housing 11 further includes a progression of the ship. A nozzle deflector 12 for adjusting the direction is mounted.
[0015]
The impeller housing 11 and the nozzle deflector 12 are disposed in the pump chamber 13, and the nozzle deflector 12 rotates left and right around the vertical axis according to the rotation of the steering handle 3. An impeller 14 is disposed in the impeller housing 11, and the front end of the impeller shaft 15 of the impeller 14 is connected to the rear end of the crankshaft 16 of the engine 7 via a power transmission member 17. An opening 18 is formed at the upper end of the propulsion duct 10, and an inspection cylinder 19 is provided in communication with the opening 18 to remove dust from the water suction port 9. A lid 20 that can be opened and closed from above is provided in the opening 18. Is provided.
[0016]
The engine 7 is a water-cooled four-cycle parallel four-cylinder engine, and includes a cylinder block 21, a cylinder head 22, a cylinder head cover 23, and an oil pan 24. The engine 7 moves the crankshaft 16 on the hull center line L1. It is mounted on the ship bottom 2a toward the hull longitudinal direction. The oil pan 24 is provided with an oil filter 25 of an oil supply system.
[0017]
As shown in FIG. 3, the cylinder shaft L2 of the engine 7 is inclined to the right side, and an intake system is connected to the right side and an exhaust system is connected to the left side. That is, each intake pipe 31 is connected to the right side of the cylinder head 22, and an intake chamber 32 common to each cylinder is connected to each intake pipe 31. The intake chamber 32 has a box shape and extends in the longitudinal direction of the hull. Further, an intake pipe 33 connected to the intake chamber 32 extends through the bulkhead 4 into the propulsion unit chamber 6 at the rear. An intake filter 34 is provided at the intake port, and the intake system sucks cold outside air from inside the propulsion unit chamber 6.
[0018]
An exhaust manifold 40 made of an aluminum alloy for exhaust system is connected to the right side of the cylinder head 22, and the exhaust manifold 40 extends downward along the engine side, and an exhaust pipe 41 made of aluminum alloy is bolted to the exhaust manifold 40. The bolts 90 passing through the holes 40a and 41a are fastened and fixed to be connected. Further, a rubber exhaust hose 42 is connected to the exhaust pipe 41, and the exhaust hose 42 extends through the bulkhead 4 into the rear propulsion unit chamber 6. A water lock 43 is connected to the exhaust hose 42, and an exhaust pipe 44 is connected to the water lock 43. The exhaust pipe 44 extends to the opposite side of the water lock 43 and opens into the pump chamber 13. It is discharged into the water.
[0019]
Since the water lock 43 provided in the exhaust system is disposed in the width direction of the hull, it is possible to shorten the dimension of the exhaust system in the hull length direction while securing a predetermined amount of the length of the exhaust system. Accordingly, the position of the engine 7 can be made closer to the stern accordingly, and a large boarding portion provided in front of the engine can be secured.
[0020]
A fuel tank 50 is disposed in front of the engine 7. A fuel supply hose 51 and a fuel return hose 52 are connected to a fuel injector (not shown) provided in the engine 7 and the fuel tank 50. A fuel pump 53 and a fuel filter 54 are disposed in the fuel supply hose 51. By driving the fuel pump 53, fuel is supplied to the fuel injector via the fuel supply hose 51, and excess fuel is returned to the fuel tank 50 via the fuel return hose 52.
[0021]
The small vessel 1 includes a first cooling water passage 62 that allows a cooling water inlet 60 and a cooling water outlet 61 of the engine 7 to communicate with each other outside the engine, and a second cooling water that covers the periphery of the first cooling water passage 62. And a passage 63. The first cooling water passage 62 is configured by a coolant hose 62a. The second cooling water passage 63 is configured by a heat exchanger 63a formed of copper-based metal so as not to be corroded by seawater, and is disposed on the side of the engine 7 substantially in parallel with the crankshaft 16 and with the engine width. The heat exchanger 63a is formed so as to have substantially the same length, and it is easy to secure the arrangement space and is efficient. The cooling water inlet 64 of the second cooling water passage 63 is connected to the impeller housing 11 downstream of the impeller 14 via the first water supply pipe 65 penetrating the bulkhead 4 and communicates with the positive pressure portion of the water jet propulsion unit 8. is doing.
[0022]
A cooling water outlet 66 of the second cooling water passage 63 communicates with the outside of the ship via a second water supply pipe 67. That is, the second water supply pipe 67 is branched into a pair of distribution pipes 69 via a distributor 68, and is connected to the exhaust manifold 40 by the pair of distribution pipes 69. The exhaust manifold 40 is bent downward, and a cooling water jacket 70 is formed around it.
[0023]
A pair of distribution pipes 69 branched from the second water supply pipe 67 communicates with the cooling water jacket 70 formed in the upper end portion of the cooling water jacket 70, specifically, the mounting flange 99 to the cylinder head 22 of the exhaust manifold 40. The cooling water jacket 70 is supplied with cooling water to cool the exhaust manifold 40. The cooling water supplied to the cooling water jacket 70 of the exhaust manifold 40 is supplied to a cooling water jacket 71 formed around the exhaust pipe 41. The cooling water in the cooling water jacket 71 of the exhaust pipe 41 is mixed with the exhaust gas in the exhaust passage at the downstream end of the exhaust pipe 41, and a part thereof is discharged outside the ship by the water discharge hose 72.
[0024]
Further, an oil cooler 80 for cooling engine oil is provided in the first water supply pipe 65 or the second water supply pipe 67, and the oil cooler 80 is cooled with water supplied from the water jet propulsion device 8 .
[0025]
In this way, the second cooling water passage 63 that covers the periphery of the first cooling water passage 62 through which the cooling water of the engine 7 passes is provided, and the second cooling water passage 63 is taken out from the positive pressure portion of the water jet propulsion device 8. Since the cooling water of the engine 7 is cooled by supplying water, a special device such as a water pump for indirectly cooling the cooling water of the engine 7 is not required, and the cooling device is simple.
[0026]
Further, since the second cooling water passage 63 is arranged on the side of the engine 7 substantially in parallel with the crankshaft 16, even if the second cooling water passage 63 is enlarged, it can be arranged compactly in the vicinity of the engine. it can.
[0027]
In addition, water extracted from the positive pressure portion of the water jet propulsion unit 8 is supplied to the cooling water jacket 70 formed around the exhaust manifold 40 connected to the cylinder head 22 via the second cooling water passage 63. The cooling device is simple without requiring an independent cooling device for supplying the cooling water to the cooling water jacket 70 of the exhaust manifold 40.
[0028]
Further, the exhaust manifold 40 connected to the cylinder head 22 of the engine 7 is bent downward, and the upper end portion of the cooling water jacket 70 formed around the exhaust manifold 40 is connected to the first through a distributor 68 and a pair of distribution pipes 69. 2 Since the water supply pipe 67 is connected, when the engine 7 is stopped, the cooling water in the cooling water jacket 70 falls downward and flows into the exhaust hose 42 or is discharged out of the ship by the water discharge hose 72. Therefore, even if seawater is sent from the water jet propulsion device 8 into the cooling water jacket 70, the exhaust manifold 40 can be prevented from being corroded by salt.
[0029]
Note that the cooling water outlet 66 of the second cooling water passage 63 is out of the ship via the second water supply pipe 67, of course, when the downstream end of the second water supply pipe 67 is directly opened to the outside of the ship. As shown in the figure, this includes the case where the exhaust pipe 41 communicates with the outside of the ship via the cooling water jacket 71, the water discharge hose 72, the exhaust hose 42, and the like.
[0030]
【The invention's effect】
As described above, in the first aspect of the present invention, the second cooling water passage that covers the periphery of the first cooling water passage through which the engine cooling water passes is provided, and the positive pressure of the water jet propulsion unit is provided in the second cooling water passage. The cooling water of the engine is cooled by supplying the water taken out from the section, so there is no need for a special device such as a water pump for indirectly cooling the cooling water of the engine, and the cooling device is simple. is there. Moreover, water can be taken in from the positive pressure part of a water jet propulsion machine, and the water can be used for cooling an exhaust manifold.
[0031]
In the invention according to claim 2, the oil cooler can also be cooled.
[0032]
According to the third aspect of the present invention, water extracted from the positive pressure portion of the water jet propulsion device is supplied to the cooling water jacket formed around the exhaust manifold connected to the cylinder head via the second cooling water passage. Therefore, an independent cooling device for supplying cooling water to the cooling water jacket of the exhaust manifold is not required, and the cooling device is simple. Also, the exhaust water manifold connected to the cylinder head of the engine is bent downward and the second water supply pipe is connected to the upper end of the cooling water jacket formed around the exhaust manifold. Since the inside cooling water does not fall down and accumulate in the cooling water jacket, even if seawater is sent from the water jet propulsion device into the cooling water jacket, the exhaust manifold can be prevented from being corroded by salt.
[Brief description of the drawings]
FIG. 1 is a plan view in which a portion where an engine unit and a water jet propulsion unit of a small ship are arranged is cut away.
FIG. 2 is a side view of a portion where an engine unit and a water jet propulsion unit of a small boat are arranged.
FIG. 3 is a rear view showing an exhaust system of an engine of a small boat.
FIG. 4 is an exploded view showing an exhaust system of an engine of a small boat.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Small ship 2 Hull 7 Engine 8 Water jet propulsion machine 60 Cooling water inlet 61 Cooling water outlet 62 1st cooling water path 63 2nd cooling water path 65 1st water supply pipe 66 Cooling water outlet 67 2nd water supply pipe

Claims (3)

In a small ship where a water-cooled engine is installed in the hull and a water jet propulsion machine is driven by this engine,
A cooling water inlet and a cooling water outlet of the engine communicate with each other outside the engine, and a second cooling water passage covering the periphery of the first cooling water passage,
The cooling water inlet of the second coolant passage, communicated with the positive pressure of the water jet propulsion unit via a first water supply pipe,
A second water supply pipe is connected to the cooling water outlet of the second cooling water passage;
The small watercraft characterized in that the second water supply pipe communicates with a cooling water jacket provided in an exhaust manifold, and communicates with the outside of the ship through the cooling water jacket . The small vessel according to claim 1, wherein an oil cooler for cooling engine oil is provided in the second water supply pipe . Said exhaust manifold connected to the cylinder head of the engine, causes bent downward to form said cooling water jacket around,
The second water supply tube connected to the cooling water outlet of the second cooling water passage is connected to the upper end of the cooling water jacket,
Said second cooling water passage, small watercraft as claimed in claim 1, wherein the communicating overboard through the second water supply pipe and the cooling water jacket.

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