JPH09310630A - Exhaust gas detector arranging structure of water vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve detecting accuracy of exhaust gas, and also facilitate taking-in work of exhaust gas by forming an exhaust gas detector mounting hole for detecting exhaust gas performance on the upstream side from a mixing flow part and a water lock in an exhaust system, and in the vicinity of the lower side of a maintenance opening. SOLUTION: In a water vehicle provided with a carriage type seat 7, a four cycle engine 9 is mounted on the lower side of a seat 1 in a vessel, the circumference of an exhaust manifold 36 is cooled, and cooling water is mixed with exhaust gas on the downstream side of the exhaust manifold 36. A water lock is arranged in an exhaust system to prevent outer water from invading into the exhaust manifold 36 side. In this case, in the exhaust manifold 36, an exhaust probe mounting hole 55 is formed on a flange 34 for connecting upstream and downstream pipes 37a, 37b of a manifold pipe 37 extending downward a cylinder head 28 while positioning it in the vicinity of the lower side of the maintenance opening 4c of a deck 4, and a plug 56 is detachably screwed around the hole 55.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water vehicle which generates a propulsive force by pressurizing water sucked from the bottom of a ship and injecting it toward the rear of the stern, and particularly to 4
The present invention relates to an exhaust gas detector arrangement structure when a cycle engine is adopted.

[0002]

2. Description of the Related Art In recent years, a watercraft of a jet propulsion type, in which water drawn from the bottom of a ship is pressurized by an impeller and jetted rearward of the stern to travel on the water, has attracted attention. As this water vehicle, an engine that rotationally drives a propulsion unit is installed in the hull, and a saddle type seat is arranged on the deck that constitutes the hull,
There is a structure in which a foot rest is formed on the left and right sides of the deck.

As a propulsion unit driving engine of this type, a two-cycle engine has generally been used conventionally because of its simple structure, light weight, and high output. However, in the case of the two-cycle engine, there is a problem that the amount of CO and HC in the exhaust gas released into the water is large.

On the other hand, the four-cycle engine is advantageous in that the amount of CO and HC in the exhaust gas is smaller than that of the two-cycle engine, so that the influence on air pollution is small. For this reason, recently, the adoption of a 4-cycle engine in the water vehicle has also been considered.

[0005]

By the way, in the water vehicle engine, the temperature rise of the exhaust system may be suppressed by mixing a part of the cooling water into the exhaust system.
Further, it is conceivable to provide an exhaust gas detector mounting hole for collecting the exhaust gas and detecting the exhaust gas property in the above engine. However, depending on the arrangement of the mounting holes, there is a concern that the concentration of the detected component may change due to the mixed cooling water, and that the sampling operation may be difficult.

The present invention has been made in view of the above circumstances, and has a structure for arranging an exhaust gas detector of a water vehicle capable of improving the detection accuracy of exhaust gas when a four-cycle engine is adopted and facilitating sampling work. Is intended to provide.

[0007]

According to a first aspect of the present invention, a saddle-riding type seat is mounted on a deck of a hull in which a bathtub-shaped hull and a lid-shaped deck are connected in a substantially watertight manner. The left and right side of the vehicle has a footrest part, a four-cycle engine is installed under the seat in the hull, and the periphery of the exhaust manifold is water-cooled, and the cooling water is mixed in the exhaust gas downstream of the exhaust manifold. In the exhaust gas detector arrangement structure of the water vehicle equipped with a water lock for preventing external water from entering the exhaust manifold side in the exhaust system and running on the water by rotationally driving the propulsion unit by the above engine , Exhaust gas in the exhaust system upstream of the mixed flow portion and the water lock, and near the lower portion of the maintenance opening formed at the workable position from the foot riding portion. Was collected, it is characterized by the formation of the exhaust gas detector mounting hole for detecting the exhaust gas property.

According to a second aspect of the present invention, in the first aspect, the exhaust manifold is configured to join exhaust gases from a plurality of cylinders, and the exhaust gas detector mounting hole is formed from a joining portion of the exhaust manifold. It is characterized in that it is formed on the downstream side.

The exhaust gas detector according to the present invention includes an exhaust probe for detecting exhaust gas properties at the time of inspection before shipment, an O ₂ sensor used for feed bag control of the combustion state of the engine, and the like. The present invention also provides
This includes not only the case of mixing the cooling water in the exhaust passage that connects the exhaust manifold and the water lock, but also the case of mixing the cooling water in the water lock.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 8 are views for explaining an exhaust probe arrangement structure of a water vehicle according to an embodiment of the invention of claims 1 and 2.
3 is a left side view, a rear plan view, and a rear view of the water vehicle, FIG. 4 is a sectional view of an exhaust probe mounting hole, and FIGS. 5 and 6 are sectional front views and sectional side views of a water lock.
7 and 8 are a sectional view and a perspective view of the anode. In addition,
The left, right, front and rear in this embodiment are the left, right, front and rear when viewed in a state of being seated on a seat unless otherwise specified.

In the figure, reference numeral 1 is a water vehicle, and a hull 2 of the water vehicle is formed by connecting a bathtub-shaped hull 3 and a lid-shaped deck 4 in a watertight manner with a gunnel 5, and a hatch cover 6 at the front of the deck 4. It has a structure that can be opened and closed. A saddle-riding type seat 7 is removably arranged in the center of the upper surface of the deck 4, and a steering handle 8 is arranged in the front part of the seat 7 so as to be steerable left and right. A vertical wall-shaped blue work 4a is integrally erected on the left and right edges of the deck 4, and a stepped foot 4b is formed inside the blue work 4a.

A maintenance opening 4c is formed in the deck 4 below the seat 7, and the opening 4c is openably and closably covered by a bottom plate 7a of the seat 7. An engine 9 is mounted below the seat 7 in the hull 2, and a fuel tank 10 is disposed below the hatch cover 6 in front of the engine 9. A bulkhead 14 for partitioning the inside of the hull 2 into an engine room 12 and a propulsion machine room 13 is provided behind the engine 9, and a propulsion unit 15 is provided in the propulsion machine room 13. .

The propulsion unit 15 has an impeller shaft 18 to which an impeller 17 is fixedly inserted and disposed in a propulsion passage 16 having a suction port 16a opening to the ship bottom 2a and an injection port 16b opening to the stern 2b. A nozzle deflector 19 is connected to the opening 16b so as to be swingable right and left and up and down. The impeller shaft 18 is rotatably supported by the bulkhead 14, and the output shaft 9a of the engine 9 is provided.
To a coupling 20.

The propulsion unit 15 sucks water from the suction port 16a by the rotation of the impeller 17, pressurizes the sucked water, and the nozzle deflector 19 of the jet port 16b.
The thrust is generated by injecting backward from. Further, a swivel mechanism and a trim mechanism (not shown) are connected to the nozzle deflector 19, and both mechanisms are connected to the steering handle 8 via an operation cable.
By operating the steering handle 8, the hull 2 can be turned or the trim angle can be changed.

The engine 9 is a water-cooled four-cycle two-cylinder engine, in which the crankshaft 25 is oriented substantially horizontally in the front-rear direction and the cylinder axis A is inclined to the right when viewed from the rear. The engine 9 has a schematic structure in which a cylinder block 27 and a cylinder head 28 are laminated and fastened on a crankcase 26, and a head cover 29 is attached to the cylinder head 28.

The intake system of the engine 9 has intake ports (not shown) on the side wall of the cylinder head 28 on the side opposite to the inclined side.
The intake manifold 30 that communicates with the intake manifold 30 is erected upward and connected, and the intake silencer 32 is connected to the intake manifold 30 via a carburetor 31.

The exhaust system of the engine 9 has the following structure. On the inclined side surface of the cylinder head 28, an exhaust manifold 3 communicating with each exhaust port (not shown).
6 is connected. The merging pipe 37 of the exhaust manifold 36 extends rearward below the cylinder head 28.
This merging pipe 37 is divided into an upstream pipe 37b and a downstream pipe 37a, and both 37b and 37a are integrally connected by a flange 34.

Further, an exhaust chamber 38 extending in the ship width direction is arranged at the rear of the engine 9, and the downstream pipe 37a is inserted through the right bottom portion of the exhaust chamber 38, and the downstream pipe 37a is It extends to the center of the chamber 38. An exhaust pipe 4 is provided at the left bottom of the exhaust chamber 38.
0 is connected, and the exhaust pipe 40 is connected to the bulkhead 14
And extends into the propulsion unit chamber 13. A water lock 41 for preventing backflow of water is disposed on the left side of the propulsion passage 16 of the propulsion chamber 13, and the downstream end of the exhaust pipe 40 is connected to the front end side of the water lock 41. ing.

A sulhal exhaust pipe 42 is connected to the upper wall of the rear end of the water lock 41,
The sulhal exhaust pipe 42 extends upward and extends in the ship width direction so as to straddle the propulsion passage 16, is bent downward from here, and is connected to the vicinity of the injection port 16b on the right side of the propulsion passage 16.

As shown in FIGS. 5 and 6, the water lock 41 divides the inside of the outer cylinder 41a into an upstream chamber and a downstream chamber by a partition plate 41b, and four inner cylinders 4 communicating with each other.
1c is fixed to the partition plate 41b, the downstream end 40a of the exhaust pipe 40 is provided in the upstream chamber, and the upstream end 42 of the sulhal exhaust pipe 42 is provided in the downstream chamber.
a is inserted respectively. A pressure release hole 40b communicating with the inside of the water lock 41 is formed at the downstream end 40a of the exhaust pipe 40. This prevents water from flowing back into the exhaust pipe 40 due to engine negative pressure generated at the time of misfire.

This is for the following reason. That is, the exhaust pipe 4
When water is collected at the bottom of the water lock so as to block the opening of the downstream end 40a for the water lock of No. 0, even if the engine negative pressure due to misfire acts on the exhaust pipe 40, the water lock is provided via the pressure relief hole 40b. This is because the air inside is sucked into the downstream end 40a and the negative pressure in the exhaust pipe is canceled.

The water lock 41 is made of aluminum, and the anode 35 is attached to the water lock 41. The anode 35 is, as shown in FIGS. 7 and 8, a bolt 3 detachably screwed to the outer cylinder 41a.
A pseudo electrode material 35b made of zinc is screwed to 5a, and the pseudo electrode material 35b is immersed in water in the water lock 41 to prevent corrosion. That is, unlike the two-cycle engine, the exhaust gas of the four-cycle engine has no oil content, so that the exhaust system is easily corroded. To prevent this, zinc or the like having a greater ionization tendency than aluminum is immersed.

Cooling jackets 43, 44 having a double wall structure are formed on the outer peripheral portions of the exhaust manifold 36 and the exhaust chamber 38, respectively. A cooling water inlet 45 is connected to the upstream end of the cooling jacket 43 of the exhaust manifold 36, and an outlet 46 is connected to the downstream end thereof. An inlet 47 is provided at the upstream end of the cooling jacket 44 of the exhaust chamber 38, and an outlet 4 is provided at the downstream end thereof.
8 are connected to each other.

The cooling system of the engine 9 has the following structure. The upstream end of the cooling water supply pipe 50 is connected to the downstream side of the impeller 17 of the propulsion passage 16, and the downstream end of the supply pipe 50 is connected to the inlet 4 of the exhaust manifold 36.
5 is connected. This supply pipe 50 is the above-mentioned propulsion passage 1
The water that is pressurized by the impeller 17 of No. 6 is taken in.

The outlet 46 of the exhaust manifold 36 and the cooling jacket inlet 28a of the cylinder head 28 are connected by a first cooling water hose 51 so that the cooling jacket outlet 27a of the cylinder block 27 and the exhaust chamber 38 flow. A second cooling water hose 52 is connected for communication with the inlet 47. The outlet 48 of the exhaust chamber 38 and the outlet 54 connected to the downstream end of the sulhal exhaust pipe 42 are connected by a third cooling water hose 53. And this exhaust chamber 38
A communication hole (not shown) communicating with the inside of the exhaust pipe 40 is formed at the downstream end of the cooling jacket 44, so that a part of the cooling water is mixed in the exhaust pipe 40.

The cooling system supplies pressurized water taken in from the downstream side of the impeller 17 to the cooling jacket 43 of the exhaust manifold 38 through the supply pipe 50, and the jacket 43
Is supplied to the cylinder head 28 from the first cooling hose 51 from the cylinder head 28 to the cylinder block 27.
Through the second cooling water hose 52 through the exhaust chamber 38
Is supplied to the cooling jacket 44, and part of the cooling water exiting the jacket 44 is discharged to the outside of the ship via the cooling hose 53, and the rest is mixed with the exhaust gas in the exhaust pipe 40. As a result, the cooling is performed in descending order of temperature, the temperature rise in the engine compartment 12 due to exhaust heat can be suppressed, and the deterioration of the restartability and the decrease of the charging efficiency due to the rise of the intake temperature when the 4-cycle engine is adopted. It is possible to avoid this, and further it is possible to avoid heat influence on engine accessories such as electric components.

As shown in FIGS. 3 and 4, an exhaust probe mounting hole 55 communicating with the merging pipe 37 is formed in the flange 34 connecting the upstream pipe 37b and the downstream pipe 37a of the merging pipe 37. And a plug 56 in the mounting hole 55.
Is detachably screwed. The exhaust probe mounting hole 55 is arranged on the upstream side of the cooling water mixed flow section of the exhaust chamber 38 and on the downstream side of the confluent section of the exhaust manifolds 36, and the maintenance opening 4c of the deck 4 is provided.
It is located near the lower part of.

Next, the function and effect of this embodiment will be described. In the present embodiment, in order to collect the exhaust gas, the seat 7 is removed and the operator stands on the footrests 4b and 4b straddling the maintenance opening 4c. 5
Insert the probe of the exhaust probe into 5.

As described above, according to this embodiment, the merging pipe 3 located upstream of the cooling water mixed flow portion of the exhaust chamber 38.
Since the exhaust probe mounting hole 55 is formed in the flange 34 of No. 7, cooling water is not mixed in the collected exhaust gas, and the detected component concentration does not fluctuate depending on water. Can be improved. Also, the mounting hole 55
Is located near the lower part of the maintenance opening 4c,
The sampling work can be performed while straddling the foot rests 4b and 4b, and the sampling can be easily performed in a stable working posture.

Further, since the exhaust probe mounting hole 55 is formed on the downstream side of the confluent portion of each exhaust manifold 36, it is not necessary to collect gas for each cylinder, and the work efficiency can be improved by performing only one collection.

Further, since the exhaust probe mounting hole 55 is provided on the upstream side of the water lock 41, the water lock 41 blocks the inflow of water that has entered from the outlet of the exhaust system into the exhaust probe mounting hole 55 side. Therefore, the detection accuracy is improved because the probe is not splashed with water.

In the above embodiment, the exhaust probe mounting hole is formed in the portion of the exhaust system located below the seat, but the mounting position of this mounting hole is such that the hand is inserted while standing on the footrest part. Any position that allows you to
For example, when the exhaust system is located below the steering wheel, the exhaust prog mounting hole may be provided at a position accessible to the exhaust system.

Further, as shown by the chain double-dashed line in FIG. 2, the exhaust pipe 40 is guided to the space on the side opposite to the inclined side of the cylinder axis, and
By providing the exhaust probe mounting hole 55 in the exhaust pipe 40 so as to be located below the maintenance opening 4c, the cylinder and the like do not get in the way, and the exhaust gas sampling operation becomes easier.

In the above embodiment, the case of the exhaust probe mounting hole 55 has been described, but the present invention can also be applied to the case of providing the O ₂ sensor mounting hole at the position of the exhaust probe mounting hole 55.

[0035]

As described above, according to the exhaust gas detector arrangement structure of the water vehicle according to the invention of claim 1, the exhaust gas detector mounting hole is provided on the upstream side of the mixed flow section of the exhaust system and on the footrest section. Since it is formed near the lower part of the maintenance opening formed at the workable position, it has the effect of preventing the mixed flow of cooling water and improving the detection accuracy, and also has the effect of easily collecting in a stable working posture. .

According to the second aspect of the present invention, the exhaust gas detector mounting hole is formed on the downstream side of the confluence portion of the exhaust manifolds from the plurality of cylinders. Therefore, only one sampling work is required for the plurality of cylinders. Can be improved, or one O ₂ sensor can be used for a plurality of cylinders, and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a side view of a water vehicle according to one embodiment of the present invention.

FIG. 2 is a plan view of an exhaust system of the water vehicle.

FIG. 3 is a rear view of an exhaust system of the water vehicle.

FIG. 4 is a sectional view showing an exhaust probe mounting hole of the exhaust system.

FIG. 5 is a sectional front view of a water lock of the exhaust system.

FIG. 6 is a sectional side view of the water lock.

FIG. 7 is a cross-sectional view showing an anode of the water lock.

FIG. 8 is a perspective view of the anode.

[Explanation of symbols]

1 Water Vehicle 2 Hull 3 Hull 4 Deck 4b Footrest 4c Maintenance Opening 7 Seat 9 4 Cycle Engine 15 Propulsion Unit 36 Exhaust Manifold (Exhaust System) 37 Confluent Pipe (Exhaust System) 38 Exhaust Chamber (Exhaust System) 41 Water Lock ( Exhaust system) 55 Exhaust probe mounting hole (exhaust gas detector mounting hole)

Front page continued (72) Inventor Ryoichi Nakase 2500 Shinkai, Iwata-shi, Shizuoka Prefecture Yamaha Motor Co., Ltd. (72) Inventor Toshiyuki Hattori 2500, Shinkai, Iwata City, Shizuoka Prefecture Yamaha Motor Co., Ltd.

Claims (2)

[Claims] 1. A saddle-type seat is mounted on a deck of a hull in which a bath-shaped hull and a lid-shaped deck are connected in a substantially watertight manner, and foot rests are formed on the left and right sides of the seat. Then, a four-cycle engine is mounted below the seat in the hull to cool the periphery of the exhaust manifold with water and to mix the cooling water with the exhaust gas downstream of the exhaust manifold to prevent external water from entering the exhaust manifold side. In the exhaust gas detector arrangement structure of the water vehicle, which is equipped with a water lock for preventing the above, and is driven on the water by rotationally driving the propulsion unit by the engine,
Exhaust gas detection that collects exhaust gas and detects the exhaust gas properties in the exhaust system, upstream of the mixed flow section and water lock, and in the vicinity of a maintenance opening formed at a workable position from the foot riding section. An exhaust gas detector arrangement structure for a water vehicle, which is characterized in that a device mounting hole is formed. 2. The exhaust manifold according to claim 1, wherein the exhaust manifold is configured to join exhaust gases from a plurality of cylinders, and the exhaust gas detector mounting hole is formed on a downstream side of a joining portion of the exhaust manifold. The exhaust gas detector arrangement structure of the water vehicle, which is characterized in that