JP4627129B2 - Jet-propelled planing boat - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a jet propulsion planing boat including a small planing boat (Personal Watercraft (also called PWC)) that jets a water flow backward and sails on the water by reaction thereof, and more particularly to a cooling passage thereof.
[0002]
[Background Art and Problems to be Solved by the Invention]
In recent years, so-called jet-propelled planing boats, for example, jet-propelled small planing boats, are widely used for leisure, sports or rescue. In this jet propulsion type personal watercraft, generally, water sucked from a water inlet provided on the bottom surface of a boat is pressurized and accelerated by a water jet pump and jetted backward to propel the hull.
[0003]
And, in the case of this jet propulsion type personal watercraft, the water injection direction to the rear is changed to the left and right by swinging the steering nozzle arranged behind the injection port of the water jet pump to the left and right, Steer the boat to the right or left.
[0004]
By the way, in the case of this jet propulsion type personal watercraft, since the engine is disposed in the boat, the engine is cooled exclusively by water. In particular, in order to reduce the size and weight of the engine, a so-called “direct water cooling method” is adopted for cooling the engine by directing the water outside the ship directly into the engine.
[0005]
Further, in order to reduce the size and weight, in the case of a jet propulsion type personal watercraft, a part of the water passing through the water jet pump from the positive pressure region of the water jet pump used for propulsion is used. Is taken out and supplied to the engine side through the cooling passage.
[0006]
In the case of such a “direct water cooling method”, particularly in the case of the “direct water cooling method” in which water is absorbed from the bottom of the boat, foreign matter such as sand outside the boat may be mixed into the cooling passage.
[0007]
Thus, the foreign matter mixed in the cooling passage is likely to be clogged in the cooling passage, particularly in the small diameter bypass passage branched from the main cooling passage through the branch portion.
However, at present, it is difficult to find where in the bypass passage the blockage is.
[0008]
The present invention has been made in view of such a situation, and a jet propulsion type personal watercraft having a cooling passage, in particular, a bypass passage having a small diameter is less likely to be clogged with foreign matter, and has a cooling passage that can easily identify a clogged portion. The purpose is to provide.
[0009]
[Means for Solving the Problems]
The present invention can achieve the above object by a jet propulsion type personal watercraft having the following configuration. That is,
A jet propulsion personal watercraft according to the present invention includes a water jet pump driven by a water-cooled engine, and water that is pressurized and accelerated by the water jet pump is injected from a rear injection port to react to the reaction. In the jet-propelled planing boat configured to cool by supplying cooling water outside the boat to the cooled portion in the boat from the cooling water supply pump,
The auxiliary cooling site is cooled through a main cooling passage for supplying cooling water from the cooling water supply pump to the main cooling portion, and a bypass passage branched from the main cooling passage at a branch portion,
The water flow diameter on the branched side of the branch portion leading to the bypass passage is smaller than the diameter of the bypass passage on the downstream side.
[0010]
Thus, according to the jet propulsion type personal watercraft configured in this way, when foreign matter mixed in the cooling water supplied into the main cooling passage from the cooling water supply pump tries to enter the bypass passage, Since the small diameter portion of the branch portion of the bypass passage is easily clogged, the clogged portion of the foreign matter can be easily identified. Therefore, the foreign matter can be easily removed by removing the branch portion or the like. Further, the foreign matter that has passed through the small diameter portion of the branch portion of the bypass passage is less likely to be clogged because the bypass passage has a large diameter downstream thereof.
[0011]
Further, in the jet propulsion type personal watercraft, a plurality of water passages in which one water passage is smaller than the diameter of the downstream bypass passage are arranged in parallel at the branch portion. When the total cross-sectional area of the water passage is configured to be equal to or larger than the cross-sectional area of the downstream bypass passage, the amount of cooling water flowing through the bypass passage can be secured, and one of the plurality of water passages can be secured. Even if the water passage of the part is clogged with foreign substances, the supply of cooling water to the bypass passage can be ensured through other water passages. In other words, a certain kind of backup system can be formed. In addition, when the total cross-sectional area of the plurality of water passages in the branching portion is increased, the flow rate of the cooling water is reduced in the branching portion, so that it is possible to eliminate the situation where the foreign matter is firmly blocked in the water passage. The configuration is easy to remove.
[0012]
Further, in the jet propulsion type personal watercraft, when the diameter of the bypass passage increases toward the downstream side, a cooling passage structure in which foreign matter is hardly clogged is formed as a whole.
[0013]
Further, in the jet propulsion type personal watercraft, when the cover member is provided at the branch part and the cover member is removed so that the foreign matter stuck in the bypass passage can be removed, the foreign matter clogged at the branch part is removed. be able to.
[0014]
Further, in the jet propulsion type personal watercraft, when a part of the branch portion is transparent, it is possible to visually grasp and deal with clogging of foreign matters.
[0015]
Further, in the jet propulsion type personal watercraft, when the water pump is the water jet pump, it is not necessary to separately provide a pump for supplying cooling water, which is a preferred embodiment.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a small planing boat that is one of jet-propelled planing boats according to embodiments of the present invention will be described in detail with reference to the drawings.
[0017]
FIG. 1 is a side view showing an engine, an exhaust pipe line and a cooling passage structure in the vicinity of the engine of a personal watercraft according to an embodiment of the present invention, and FIG. 2 is a branch portion of a main cooling passage and a bypass passage of the cooling passage shown in FIG. FIG. 1 is a partial enlarged cross-sectional view of the Q portion surrounded by an alternate long and short dash line in FIG. 1 and its vicinity, FIG. 3 is a block diagram showing the entire cooling flow of the cooling passage, and FIG. FIG. 7 is a plan view of FIG. 6.
[0018]
6 and 7, A is a hull, and this hull A is composed of a hull H and a deck D covering the hull H, and a connection line connecting the hull H and the deck D all around is called a gunnel line G. In this embodiment, the gunnel line G is located above the waterline L of the personal watercraft.
[0019]
As shown in FIG. 7, a substantially rectangular opening 16 is formed in the upper surface of the hull A in a plan view extending in the longitudinal direction, slightly rearward from the center of the deck D, as shown in FIGS. Thus, a seat S for riding is disposed above the opening 16.
[0020]
The engine E is disposed in a space 20 having a “convex” cross section surrounded by the hull H and the deck D below the seat S.
In this embodiment, the engine E is a water-cooled multi-cylinder (3 cylinders in this embodiment) two-cycle engine E, and the crankshaft 26 extends along the longitudinal direction of the hull A as shown in FIG. The output end of the crankshaft 26 is integrally rotatable to the pump shaft 21S side of the water jet pump P to which the impeller 21 is attached via the propeller shaft 27. It is connected. The outer periphery of the impeller 21 is covered with a pump casing 21C. Water taken from the water inlet 17 provided on the bottom surface of the small planing boat is taken in through the water intake passage and is added by the water jet pump P. It is configured to obtain a propulsive force through pressure / acceleration and discharge from the rear end injection port 21K through a pump nozzle (spout part) 21R whose water flow cross-sectional area becomes smaller as it goes backward.
[0021]
In FIG. 6, 21V is a stationary blade for rectifying water passing through the water jet pump P. 6 and 7, reference numeral 24 denotes a steering handle which is a steering operation means. By operating the handle 24 left and right, the steering nozzle 18 behind the pump nozzle 21R is swung left and right. When the water jet pump P is in operation, the boat can be steered in a desired direction. Further, as shown in FIG. 7, a throttle lever Lt for controlling the rotational speed of the engine E is provided in the vicinity of the grip on the right side of the handle 24.
[0022]
As shown in FIG. 6, a bowl-shaped reverse deflector 19 is disposed above and behind the steering nozzle 18 so as to be swingable downward about a horizontally disposed swing shaft 19a. The deflector 19 is configured to swing backward to a lower position behind the steering nozzle 18 so that water discharged rearward from the steering nozzle 18 can be turned forward to move backward.
[0023]
6 and 7, reference numeral 22 denotes a rear deck. The rear deck 22 is provided with an openable hatch cover 29, and a small capacity storage box is formed below the hatch cover 29. 6 or 7, reference numeral 23 denotes a front hatch cover, and a box (not shown) for storing equipment and the like is provided below the hatch cover 23.
[0024]
By the way, the personal watercraft according to the embodiment of the present invention has a cooling passage structure as shown in FIGS. That is, as shown in FIG. 1 or FIG. 3 which is a block diagram, the outboard cooling water is a water flow portion of the water jet pump P (see FIG. 6) which also functions as a cooling water supply pump in this embodiment. From the positive pressure region (the region on the downstream side of the impeller (not shown)) to the main cooling passage 1 and the bypass passage 2 which branches from the main cooling passage 1 via the branch portion Br and forms a separate route. It is configured. The cooling water passing through the main cooling passage 1 and the bypass passage 2 is supplied downstream to the double pipe portion of the exhaust pipe Ep.
Here, the main cooling passage 1 passes through the branch portion Br, and passes through the main cooling portion, that is, in this embodiment, the exhaust manifold Em of the engine E and the cooling passages of the cylinder head Ch in the exhaust pipe. It has a path that feeds into the Ep double pipe section. On the other hand, the bypass passage 2 has a proximal end at a location branched from the main cooling passage 1 via the branch portion Br, and an auxiliary cooling portion, that is, in this embodiment, the third cooling passage 10 and Passing through the cooling passages in the generator 11 and the auxiliary machine 12 that are arranged, a part of them passes through the fourth cooling passage 13, and the tip of the bypass passage 2 is a double pipe of the exhaust pipe Ep. Having a path connected to the part. That is, the cooling water supplied from the main cooling passage 1 is branched into the bypass passage 2 at the branch portion Br, and the third cooling passage 10 and the fourth cooling that form a part of the bypass passage 2. Pass through the passage 13.
As shown in an enlarged view in FIG. 2, the diameter A1 of the water passage 30 of the branch portion Br leading to the bypass passage 2 is formed to be smaller than the diameter A2 of the base end portion 2A of the bypass passage 2. ing. In this embodiment, the diameter is set to approximately 1/3. Further, the diameter A 2 of the upstream portion 2 B of the third cooling passage 10 in the bypass passage 2 is configured to be smaller than that of the third cooling passage 10. In addition, the third cooling passage 10 has a smaller diameter than the fourth cooling passage 13 located on the downstream side thereof.
[0025]
Thus, in the case of the cooling passage structure according to the present embodiment configured as described above, the cooling water flowing through the main cooling passage 1 is branched into the bypass passage 2 but flows into the bypass passage 2. In this case, the water flows in through the water passage 30 of the branch portion Br. As described above, the diameter (water passage diameter) A1 of the water passage 30 is smaller than the diameter A2 of the base end portion of the bypass passage 2. Since the foreign matter mixed in the cooling water is clogged in the cooling passage, it is likely to be clogged in the water passage 30 having the smallest diameter.
Therefore, when clogging occurs in the cooling passage structure, the foreign matter can be found and removed by removing the water passage 30 first.
Further, as described above, the cooling water is passed further downstream from the base end portion 2A of the bypass passage 2, but the upstream portion of the third cooling passage 10 in the bypass passage 2. Since the diameter of the third cooling passage 10 is larger than the diameter of 2B, and the diameter of the fourth cooling passage 13 is larger than that of the third cooling passage 10, there is a possibility that foreign matter is clogged. Becomes lower toward the downstream side.
Therefore, the possibility that the foreign substance is clogged in the bypass passage 2 that has been conventionally easily clogged with the foreign substance is reduced, and the possibility that the foreign substance is clogged particularly on the downstream side of the bypass passage 2 is reduced.
Further, when a detachable lid member Cm is arranged in the water passage 30 of the branch portion Br as shown in FIG. 4, it is possible to easily find and remove foreign matters by simply removing the lid member Cm. Become. Furthermore, in such a configuration, if a part of the branch portion Br, for example, the lid member Cm is made of a transparent resin product, the foreign matter can be visually recognized from the outside without removing the lid member Cm. It becomes the structure which can judge the clogged state of. Of course, the water passage 30 may be made of a transparent resin, or the entire branch part Br may be made of a transparent resin.
4, the same reference numerals are assigned to the same or corresponding components as those in FIG. 2. In FIG. 1, E is an engine, Mf is a water muffler, Cp is a connecting pipe that connects the exhaust pipe Ep and the water muffler Mf, Ee is an exhaust end pipe that guides exhaust gas from the water muffler Mf to the outside of the boat, Rp is a cooling water return pipe for discharging the cooling water after cooling out of the boat.
By the way, instead of the above-described embodiment, as shown in FIG. 5, one water passage, that is, each of the water passages 30 a and 30 b, to the branch portion Br, in this embodiment to the water passage 30 of the branch portion Br, A plurality of water passages 30a, 30b may be provided side by side with a diameter smaller than that of the bypass passage 2 on the downstream side. In such a case, it is desirable that the total water flow cross-sectional area of the plurality of water flow paths 30a and 30b is equal to or larger than the water flow cross-sectional area of the downstream bypass passage.
If comprised in this way, while providing the small diameter water flow part in the said branch part Br, while being able to ensure the quantity of the cooling water which flows through a bypass channel sufficiently, whichever of several water flow path 30a, 30b Even if such a water passage is clogged with foreign matter, a configuration that can ensure the supply of cooling water to the bypass passage 2 via another water passage can be realized. Moreover, although FIG. 5 demonstrates embodiment which provided two water channels, it cannot be overemphasized that the number of three, four, or more may be sufficient.
Further, in this case, if the plurality of water passages 30a and 30b are made of a transparent resin, when a foreign substance is clogged inside, it can be visually detected.
[0026]
Moreover, in the said Example, although the water jet pump is used as a cooling water supply pump, it cannot be overemphasized that it may replace with this and the pump for cooling water supply may be provided separately.
[0027]
【The invention's effect】
According to the present invention, there is provided a jet propulsion type personal watercraft provided with a cooling passage structure in which a cooling passage, in particular, a bypass passage with a small diameter is less likely to be clogged with foreign matters, and a clogged portion can be specified and can be easily removed. be able to.
[Brief description of the drawings]
FIG. 1 is a side view showing an engine, an exhaust pipe line and a cooling passage structure around the engine of a personal watercraft according to an embodiment of the present invention.
2 is a partially enlarged cross-sectional view of the Q portion surrounded by the one-dot chain line in FIG. 1 and the vicinity thereof, showing the configuration of the branch portion of the main cooling passage and the bypass passage of the cooling passage shown in FIG. 1;
3 is a block diagram showing the flow of cooling water in the entire cooling passage shown in FIG.
4 is a partially enlarged cross-sectional view showing a configuration of a branch portion of a bypass passage according to another embodiment different from FIG. 2; FIG.
FIG. 5 is a partially enlarged cross-sectional view showing a configuration of a branch portion of a bypass passage according to another embodiment different from FIGS. 2 and 4;
FIG. 6 is an overall side view of a jet propulsion personal watercraft according to an embodiment of the present invention.
7 is an overall plan view of the personal watercraft shown in FIG. 6. FIG.
[Explanation of symbols]
P …… Water jet pump (cooling water supply pump)
Em …… Exhaust manifold (main cooling part)
Ch …… Cylinder head (main cooling part)
Br …… Branch part A1 …… Diameter of the water passage (water diameter on the branched side of the branch part)
A2 ... Diameter of bypass passage 1 ... Main cooling passage 2 ... Bypass passage 11 ... Generator (auxiliary cooling part)
12 ... Auxiliary machine (auxiliary cooling part)

Claims (5)

A water jet pump driven by a water-cooled engine is provided, and water pressurized and accelerated by the water jet pump is injected from the rear injection port and propelled by its reaction, and from the cooling water supply pump to the inside of the boat In a jet propulsion type personal watercraft that is configured to cool by supplying cooling water outside the boat to the part to be cooled,
The auxiliary cooling part is cooled via a main cooling passage for supplying cooling water to the main cooling part from the cooling water supply pump, and a bypass passage branched from the main cooling passage at a branch part,
The water flow diameter on the branched side of the branch portion leading to this bypass passage is made smaller than the diameter of the bypass passage on the downstream side ,
A jet propulsion personal watercraft, characterized in that a lid member is provided at the branch portion, and the lid member is removed to remove foreign substances stuck in the bypass passage .   A plurality of water passages in which one water passage is thinner than the diameter of the downstream bypass passage are arranged in parallel at the branch portion, and the total water cross-sectional area of the plurality of water passages is 2. The jet propulsion type personal watercraft according to claim 1, wherein the jet propulsion type personal watercraft is configured to be equal to or larger than a cross-sectional area of the downstream bypass passage.   The jet propulsion personal watercraft according to claim 1 or 2, wherein the bypass passage has a diameter that increases toward the downstream side. The jet propulsion personal watercraft according to any one of claims 1 to 3 , wherein a part of the branch portion is transparent. The jet propulsion personal watercraft according to any one of claims 1 to 4 , wherein the cooling water supply pump is the water jet pump.

Images