JPH11157487A - Small ship - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify a cooling system without requiring any special device such as a water pump or the like to indirectly cool the cooling water of an engine. SOLUTION: In a small ship 1, mounting a cooled engine 7 in a hull 2, and driving a water jet propeller 8 with this engine 7, it is provided with a first cooling water passage 62 interconnecting a cooling water inlet 60 and a cooling water outlet 61 of the engine 7 to each other at the engine outside, and a second cooling water passage 63 covering the periphery of this first cooling water passage 62, and the cooling water inlet 60 of this second cooling water passage 63 is interconnected to a positive pressure part of the water jet propeller 8 via a first water supply pipe 65, and the cooling water outlet 61 of the second cooling water passage 63 is interconnected to the outside of this ship via a second water supply pipe 67.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small boat in which a cooling engine is mounted in a hull and a water jet propulsion unit is driven by the engine.

[0002]

2. Description of the Related Art Some small boats have, for example, an engine mounted in the hull and drive a water jet propulsion unit to obtain a propulsion force by using the engine. Some of these engines use a water-cooling 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]

In the case where the cooling water for the engine is indirectly cooled by providing a special device such as a water pump as described above, there is a problem that the cooling device is complicated and the cost is increased.

The present invention has been made in view of the above circumstances, and provides a small boat that does not require a special device such as a water pump for indirectly cooling engine cooling water and has a simple cooling device. It is intended to be.

[0005]

Means for Solving the Problems In order to solve the above problems and achieve the object, the present invention has the following constitution.

According to a first aspect of the present invention, there is provided a small boat in which a cooling type engine is mounted in a hull and a water jet propulsion device is driven by the engine. A first cooling water passage that communicates with the outside at the outside, and a second cooling water passage that covers the periphery of the first cooling water passage; a cooling water inlet of the second cooling water passage is connected to a first water supply pipe; And a cooling water outlet of the second cooling water passage is communicated to the outside of the boat through a second water supply pipe. ].

According to the first aspect of the present invention, a second cooling water passage is provided to cover the periphery of the first cooling water passage through which the cooling water for the engine passes, and the second cooling water passage is provided with a positive water jet thruster. The cooling water for the engine is cooled by supplying water taken out from the pressure section, so no special equipment such as a water pump for indirectly cooling the cooling water for the engine is required, and the cooling device is simple. It is.

According to a second aspect of the present invention, there is provided a small boat according to the first aspect, wherein the second cooling water passage is arranged on a side of the engine substantially in parallel with a crankshaft. ].

According to the second aspect of the present invention, since the second cooling water passage is disposed substantially parallel to the crankshaft on the side of the engine, even if the second cooling water passage is enlarged, the second cooling water passage is formed on the engine. It can be arranged compactly in the vicinity.

According to a third aspect of the present invention, a cooling water jacket is formed around an exhaust manifold connected to a cylinder head of the engine and a cooling water jacket is formed around the exhaust manifold, and the exhaust manifold is connected to a cooling water outlet of the second cooling water passage. The second water supply pipe is connected to the upper end of the cooling water jacket,
The small boat according to claim 1, wherein the second cooling water passage communicates with the outside of the boat via the second water supply pipe and the cooling water jacket. ].

According to the third aspect of the present invention, the cooling water jacket formed around the exhaust manifold connected to the cylinder head is provided with the water taken out from the positive pressure section of the water jet propulsion device through the second cooling water passage. , The cooling device is simple without requiring a separate cooling device for supplying cooling water to the cooling water jacket of the exhaust manifold. Also, the exhaust 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 the cooling water jacket 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 PREFERRED EMBODIMENTS An embodiment of a small boat according to the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a plan view in which an engine portion of a small boat and a portion where a water jet propulsion unit is arranged are cut away, FIG. FIG. 4 is an exploded view showing the exhaust system of the engine of the small boat.

A steering handle 3 is provided at the center of the hull 2 of the small boat 1. A bulkhead 4 is provided behind the hull 2 to partition an engine room 5 and a propulsion unit room 6. An engine 7 is disposed in the engine room 5, and a water jet propulsion device 8 is disposed in the propulsion device room 6.

The water jet propulsion device 8 is provided on the bottom 2 a of the hull 2.
A propulsion duct 10 having a suction port 9 opening to the front is provided, an impeller housing 11 is connected to the rear of the propulsion duct 10, and a nozzle deflector 12 for adjusting a traveling direction of the ship is mounted on the impeller housing 11. .

The impeller housing 11 and the nozzle deflector 12 are arranged in a pump chamber 13, and the nozzle deflector 12 rotates right and left around a vertical axis in accordance with the rotation of the steering wheel 3. An impeller 14 is disposed in the impeller housing 11, and a front end of an impeller shaft 15 of the impeller 14 is connected to a rear end of a crankshaft 16 of the engine 7 by a power transmission member 1.
7 are connected. At the upper end of the propulsion duct 10,
An opening 18 is formed, an inspection tube 19 communicating with the opening 18 for removing dust from the water suction port 9 is provided, and the opening 18 is provided with a lid 20 which can be opened and closed from above.

The engine 7 is a water-cooled 4-cycle parallel 4
The engine 7 has a cylinder block 21, a cylinder head 22, a cylinder head cover 23, and an oil pan 24. The engine 7 has a crankshaft 16 mounted on a hull bottom 2a in the longitudinal direction of the hull on the hull center line L1. Have been. The oil pan 24 is provided with an oil filter 25 of an oil supply system.

The cylinder axis L2 of the engine 7 is inclined rightward as shown in FIG. 3, and an intake system is connected to the right side.
An exhaust system is connected to the left side. That is, the cylinder head 22
Each intake pipe 31 is connected to the right side of the
1 is connected to an intake chamber 32 common to each cylinder.
The intake chamber 32 has a box shape, extends in the longitudinal direction of the hull, and further has an intake pipe 33 connected to the intake chamber 32.
Extends through the bulkhead 4 into the rear of the propulsion unit room 6. An intake filter 34 is provided at an intake port of the intake pipe 33, and the intake system draws cool outside air from the inside of the propulsion unit room 6.

An exhaust manifold 40 made of an aluminum alloy for an exhaust system is connected to the right side of the cylinder head 22.
The exhaust manifold 40 extends downward along the side of the engine, and an exhaust pipe 41 made of an aluminum alloy is connected to the exhaust manifold 40 by tightening and fixing with bolts 90 passing through the bolt holes 40a, 41a. Further, a rubber exhaust hose 42 is connected to the exhaust pipe 41, and the exhaust hose 42 passes through the bulkhead 4 and
Extends into. 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 to the water lock 43 and opens to the pump chamber 13. Released into water.

Since the water lock 43 provided in the exhaust system is arranged in the width direction of the hull, the size of the exhaust system in the hull length direction can be shortened while securing a predetermined length of the exhaust system. Therefore, the position of the engine 7 can be made closer to the stern by that much, and the boarding portion provided in front of the engine can be widely secured.

A fuel tank 50 is disposed in front of the engine 7, and 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. Fuel supply hose 51
, A fuel pump 53 and a fuel filter 54 are arranged. When the fuel pump 53 is driven, 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.

The small boat 1 has a first cooling water passage 62 for connecting a cooling water inlet 60 and a cooling water outlet 61 of the engine 7 to each other outside the engine, and a first cooling water passage 6.
2 and a second cooling water passage 63 covering the periphery of the second cooling water passage 63. The first cooling water passage 62 includes a coolant hose 62a. The second cooling water passage 63 is constituted by a heat exchanger 63a formed of a copper-based metal so as not to be corroded by seawater, is disposed on the side of the engine 7 substantially in parallel with the crankshaft 16, and has a width corresponding to the engine width. The heat exchanger 63a is formed to have substantially the same length, and it is easy to secure the arrangement space, and the heat exchanger 63a 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 a first water supply pipe 65 penetrating the bulkhead 4 and communicates with the positive pressure section of the water jet propulsion device 8. doing.

The cooling water outlet 66 of the second cooling water passage 63 is
It communicates with the outside of the boat via a second water supply pipe 67. That is,
The second water supply pipe 67 branches 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. Exhaust manifold 40
Is bent downward, and a cooling water jacket 70 is formed therearound.

A pair of distribution pipes 69 branched from the second water supply pipe 67 are provided at the upper end of the cooling water jacket 70, specifically, a cooling water jacket formed in the mounting flange 99 of the exhaust manifold 40 to the cylinder head 22. The cooling water is supplied to the cooling water jacket 70 to cool the exhaust manifold 40. The cooling water supplied to the cooling water jacket 70 of the exhaust manifold 40 is
The cooling water is supplied to a cooling water jacket 71 formed around the cooling water jacket 1. The cooling water in the cooling water jacket 71 of the exhaust pipe 41 is
At the downstream end of the exhaust pipe 41, it is mixed with the exhaust gas in the exhaust passage, and a part of the exhaust gas is discharged outboard by a water discharge hose 72.

An oil cooler 8 for cooling the engine oil is provided in the first water supply pipe 65 or the second water supply pipe 67.
0, and the oil cooler 80 is
It may be made to cool with water supplied from.

As described above, the second cooling water passage 63 is provided so as to cover the periphery of the first cooling water passage 62 through which the cooling water of the engine 7 passes, and the positive pressure portion of the water jet propulsion unit 8 is provided in the second cooling water passage 63. The cooling water of the engine 7 is cooled by supplying the water taken out of the engine 7, so no special device such as a water pump for indirectly cooling the cooling water of the engine 7 is required, and the cooling device is simple. It is.

The second cooling water passage 63 is connected to the engine 7
Are arranged substantially parallel to the crankshaft 16 on the sides of the
Even if the cooling water passage 63 is enlarged, it can be compactly arranged near the engine.

The cooling water jacket 7 formed around the exhaust manifold 40 connected to the cylinder head 22
At 0, the water taken out from the positive pressure section of the water jet propulsion device 8 is supplied through the second cooling water passage 63, so that an independent cooling water is supplied to the cooling water jacket 70 of the exhaust manifold 40. No cooling device is required, and the cooling device is simple.

The exhaust manifold 40 connected to the cylinder head 22 of the engine 7 is bent downward, and a distributor 68 and a pair of distribution pipes 6 are provided at the upper end of a cooling water jacket 70 formed around the exhaust manifold 40.
9, the cooling water in the cooling water jacket 70 falls downward and flows into the exhaust hose 42 when the engine 7 is stopped, and the second water supply pipe 67 is connected via the water discharge hose 72. Since the water is discharged outside the boat, it does not accumulate in the cooling water jacket 70, so that even if seawater is sent from the water jet propulsion unit 8 into the cooling water jacket 70, the exhaust manifold 40 is prevented from being corroded by salt. it can.

The cooling water outlet 6 of the second cooling water passage 63
6 outboard via the second water supply pipe 67 means not only when the downstream end of the second water supply pipe 67 is directly opened toward the outboard, but also as shown in FIG. This also includes a case where the cooling water jacket 71, the water discharge hose 72, the exhaust hose 42, and the like are connected outside the boat.

[0030]

As described above, according to the first aspect of the present invention, the second cooling water passage which covers the periphery of the first cooling water passage through which the cooling water of the engine passes is provided, and the water jet is provided in the second cooling water passage. Since the engine cooling water is cooled by supplying water taken out from the positive pressure section of the propulsion unit, no special device such as a water pump for indirectly cooling the engine cooling water is required, The cooling device is simple.

According to the second aspect of the present invention, since the second cooling water passage is disposed substantially parallel to the crankshaft on the side of the engine, even if the second cooling water passage is enlarged, it can be compactly disposed near the engine. Can be arranged.

In the cooling water jacket formed around the exhaust manifold connected to the cylinder head, the water taken out from the positive pressure section of the water jet propulsion device passes through the second cooling water passage. Since the cooling water 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. Also, since the exhaust 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, the cooling water jacket is provided when the engine is stopped. Since the cooling water inside the cooling water jacket 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.

[Brief description of the drawings]

FIG. 1 is a plan view in which an engine portion of a small boat and a portion where a water jet propulsion device is arranged are cut away.

FIG. 2 is a side view of a portion of the small boat in which an engine unit and a water jet propulsion unit are arranged.

FIG. 3 is a rear view showing the exhaust system of the engine of the small boat.

FIG. 4 is an exploded view showing an exhaust system of the engine of the small boat.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Small boat 2 Hull 7 Engine 8 Water jet propulsion machine 60 Cooling water inlet 61 Cooling water outlet 62 First cooling water passage 63 Second cooling water passage 65 First water supply pipe 66 Cooling water outlet 67 Second water supply pipe

Claims (3)

[Claims] 1. A small boat having a water-cooled engine mounted on a hull and driving a water jet propulsion unit with the engine, wherein a cooling water inlet and a cooling water outlet of the engine communicate with each other outside the engine. A first cooling water passage, and a second cooling water passage covering the periphery of the first cooling water passage. The cooling water inlet of the second cooling water passage is connected to the water jet propulsion through a first water supply pipe. A small boat, which communicates with a positive pressure section of the machine and has a cooling water outlet of the second cooling water passage communicated outside the vessel through a second water supply pipe. 2. The small boat according to claim 1, wherein said second cooling water passage is arranged on a side of said engine substantially in parallel with a crankshaft. 3. The second water supply pipe connected to a cooling water outlet of the second cooling water passage, wherein an exhaust manifold connected to a cylinder head of the engine is bent downward and a cooling water jacket is formed around the exhaust manifold. 2. The small-sized device according to claim 1, wherein the first cooling water passage is connected to an upper end portion of the cooling water jacket, and the second cooling water passage communicates with the outside of the ship via the second water supply pipe and the cooling water jacket. Ship.