JPH1179095A - Accessory arrangement structure for small ship engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wholly compact structure for a small ship, including accessories. SOLUTION: In a small ship which has an opening formed above an engine to be covered with a detachable cover, a flywheel 45 is mounted at the front end of a crank shaft 40 of the engine 4 and a power takeout part is provided at the rear end of the crank shaft 40 or on an output shaft 41 connecting the crank shaft 40 to an impeller shaft, the crank shaft 40 being supported near both ends by a bearing 400, and a sel-motor (an accessory) 9 is provided with a rotary shaft parallel to the crank shaft, the power takeout part being connected in association with the rotary shaft of the sel-motor 9 and at least part of the sel-motor 9 being covered with a cylinder.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an accessory arrangement structure for an engine of a small boat.

[0002]

2. Description of the Related Art In a small marine engine such as a watercraft, fuel is supplied to the engine by a carburetor. However, it is considered that fuel is supplied by a fuel injection valve instead of the carburetor. In that case, a relatively large auxiliary device such as a fuel pump for supplying fuel from the fuel tank to the fuel injection valve is required.

[0003]

In a small boat, the space inside the boat is narrow, which limits the installation space for auxiliary equipment and the like, and it is required that each equipment be configured as compact as possible. Therefore, it is desirable that the accessories and the drive source thereof also have a compact configuration as a whole.

The present invention has been made to solve such a conventional problem, and provides an accessory arrangement structure for an engine of a small boat in which the entire configuration including accessories is compact. is there.

[0005]

According to the first aspect of the present invention, a flywheel is attached to a front end of a crankshaft of an engine in a small boat in which an opening covered with a detachable lid is formed above an engine. A power take-out portion is provided at a rear end of the crankshaft or at an output shaft connecting the crankshaft and the impeller shaft. The crankshaft is supported by bearings near both ends thereof, and a rotating shaft parallel to the crankshaft is provided. The power take-out unit and the rotating shaft of the auxiliary machine are interlocked and connected, and at least a part of the auxiliary machine is covered with an intake pipe, an exhaust pipe or an engine cylinder. is there.

According to the first aspect of the present invention, since the power of the auxiliary equipment is supplied from the crankshaft, there is no need to provide a power source for another auxiliary equipment. Can be made compact. Further, in this configuration, the power take-out portion and the flywheel can be arranged near the bearings at both ends of the crankshaft, so that the durability of the crankshaft can be improved. Further, even when water enters through the opening, since the upper part of the accessory is covered with the intake pipe, the exhaust pipe or the cylinder of the engine, it is possible to prevent or limit the splash of water to the accessory.
It should be noted that the fact that the opening is formed above the engine as used herein does not only mean that the entire engine is located in a region directly below the opening, but at least a part of the engine is located in a region directly below the opening. This is a concept that also includes the case where

According to a second aspect of the present invention, in the first aspect, the rotational force of the crankshaft is transmitted to the auxiliary machine via a balancer shaft.

According to the second aspect of the present invention, since there is no need to separately provide an auxiliary device driving device, the auxiliary device driving device can be simplified.

According to a third aspect of the present invention, in the engine for a small boat, the crankshaft is disposed laterally on the hull, and the output shaft is disposed near the hull center line so as to extend in the longitudinal direction of the hull. The output shaft is connected to the impeller shaft, an auxiliary machine of the engine is arranged near the output shaft, and the rotation axis of the auxiliary machine is arranged near the output shaft and parallel to the output shaft. Are linked to the output shaft.

According to the third aspect of the invention, the right and left weight balance of the hull is improved by arranging the auxiliary equipment near the center line in the hull length direction. In addition, since the accessory is driven by the output shaft instead of the impeller shaft, no torque for driving the accessory is applied to the connection between the impeller shaft and the output shaft, and the durability of the connection is not impaired.

According to a fourth aspect of the present invention, in the third aspect, auxiliary machines are disposed on both sides of the output shaft.

According to the fourth aspect of the invention, the right and left weight balance of the engine is improved.

According to a fifth aspect of the present invention, in the engine for a small boat, the crankshaft is disposed laterally on the hull, and the output shaft is disposed along the hull center line so as to extend in the hull length direction. The auxiliary device is interlocked with the shaft, and an auxiliary machine is arranged behind the crankshaft and beside the output shaft.

According to the fifth aspect of the present invention, a large-sized accessory can be arranged by utilizing a dead space formed behind the crankshaft and beside the output shaft.

According to a sixth aspect of the present invention, in the engine for a small boat, the crankshaft is disposed laterally on the hull, and the output shaft is disposed so as to extend in the longitudinal direction of the hull, and is interlocked with the crankshaft. An external air intake duct and an auxiliary device driven by a crankshaft are arranged in front of the engine, and the auxiliary device is arranged between the external air intake duct and the engine.

According to the sixth aspect of the present invention, the outside air sent from the outside air intake duct to the engine passes through the part of the auxiliary machine disposed between the two, so that the auxiliary machine is sufficiently cooled. Will be.

According to a seventh aspect of the present invention, in the sixth aspect, the lower end opening of the outside air intake duct is disposed at substantially the same height as the auxiliary machine.

According to the seventh aspect of the invention, most of the outside air sent from the outside air intake duct to the engine passes through the part of the auxiliary machine disposed between the two, so that the cooling of the auxiliary machine is sufficient. Will be performed.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a side view of a hull in which a bow is cut away.
Numeral 0 designates a steering wheel 2 provided at an upper portion near the center of the hull, and a straddle-type seat 20 serving as a driver's seat is provided on the rear side thereof. A step 21 is formed, and a bulwark 22 serving as an upper end of a ship side plate is formed on the outer side of the ship. The sheet 20 is placed on a sheet table 27 as shown in FIG. 4, and the packing 2 is formed so as to cover an opening 200 formed in a top plate 28 of the sheet table 27 with a seal structure.
9 to removably attach the opening 200. That is, the sheet 20 forms a removable lid that covers the opening 200. An engine room 10 is formed below the steering wheel 2 inside the hull, a two-cycle two-cylinder engine 4 is installed in the engine room 10, and a fuel tank 8 is installed in front of the engine 4. An outside air intake duct 11 that supplies air into the engine room 10 and an exhaust pipe 12 that exhausts air from the engine room 10 are provided. The front outside air intake duct 11 has a lower end between the engine 4 and the fuel tank 8. Is opened. Part of this engine 4 is
It is located in a region directly below the opening 200 covered with.
A water jet propulsion device 3 driven by the engine 4 is installed at the bottom of the stern stern.

The jet propulsion device 3 has a flow path 31 extending from the bottom to the stern, and an impeller 33 is installed in the flow path 31. A front end of the impeller shaft 34 is connected to an output shaft 41 of the engine 4. The water is introduced into the flow channel 31 from the water inlet 30 opened to the bottom of the ship by the rotation of the hull, and the thrust is generated by injecting the water rearward from the nozzle 32 at the rear end.

FIG. 2 is an enlarged view of FIG. 1, and FIG. 3 is a plan view of the engine. As shown in these figures, the engine 4 is provided with a cylinder 43 inclined in the stern direction. The exhaust pipe 44 extends upward from the crankshaft 40.
The rear end of the exhaust pipe 44 is opened at the stern, and the crankshaft 40 is disposed horizontally on the hull so as to face the width direction of the ship, and a pair of bearings 400 are provided near the center and both ends, respectively. Supported by In addition, cylinder 4
An intake pipe 6 and an intake box 61 are arranged on the anti-inclined side of 3, and the balancer shaft 5 is arranged below and supported by bearings 500 at both ends in parallel with the crankshaft 40. A gear 49 is provided near the center of the crankshaft 40. The gear 49 meshes with a gear 59 provided on the balancer shaft 5, so that the balancer shaft 5 and the crankshaft 40 have the same speed in opposite directions. It is interlocked and connected to rotate. Reference numeral 410 denotes a crank shaft center, 411 denotes a vertical plane including the crank shaft center, and 412 denotes a cylinder shaft center.

A bevel gear 48 is provided near the center of the crankshaft 40, and the output shaft 41 is supported by bearings 401 near both ends and arranged in a direction perpendicular to the crankshaft 40. A bevel gear 413 that meshes with the crankshaft 4 is provided at one end of the output shaft 41 via the bevel gears 48 and 413.
Zero torque is transmitted to the output shaft 41.
The output shaft 41 is arranged along the center line of the hull, the vicinity of both ends of the output shaft 41 is supported by bearings 401, and the other end of the output shaft 41 is provided with a coupling 42. The impeller shaft 34 is connected.

On one side of the output shaft 41, a fuel pump (auxiliary machine) 80 is installed in close proximity, and on the other side, an oil pump (auxiliary machine) 7 is installed in close proximity. The gear 47 provided between the bearings 401 of the output shaft 41
The gear 81 provided on the shaft of the fuel pump 80 and the gear 71 provided on the shaft of the oil pump 7 are meshed with each other. Further, a cell motor (auxiliary machine) 9 is provided on a side of the oil pump 7 (a side opposite to the output shaft 41), and a gear 91 provided on the shaft is provided with a flywheel at the shaft end of the crankshaft 40. Gear 4 provided at 45
It is engaged with 50. The fuel pump 80, the oil pump 7, and the starter 9 are disposed along the crankshaft 40 at the rear of the crankshaft 40 in a region (the region indicated by the phantom line 430 in FIG. 3) covered by the cylinder 43 below the cylinder 43. ing.

In the above configuration, since the fuel pump 80 and the oil pump 7 are provided in the spaces on both sides of the output shaft 41 which is a dead space, the size of the engine 4 does not increase. The output shaft 4 arranged along the hull center line.
Since the fuel pump 80 and the oil pump 7 are arranged separately on both sides of the vehicle 1, the weight balance between the left and right sides of the hull is improved, and the auxiliary equipment is driven by the output shaft 41 instead of the impeller shaft 34. In addition, no torque for driving auxiliary equipment is applied to the connection between the impeller shaft 34 and the output shaft 41, and the durability of this connection is not impaired. Although power is taken out to the starter motor 9 via the flywheel 45 at the shaft end of the crankshaft 40, the crankshaft 40 is supported by the bearing 400 at the shaft end. Is better. In such a small boat, the engine 20 may be inspected by removing the seat 20 at sea and opening the opening, and even if waves are driven in at this time, the fuel pump 80, the oil pump 7, the cell motor Since the auxiliary equipment such as 8 is arranged in the area 430 below the cylinder 43 (the area indicated by the phantom line hatching), it is possible to prevent or restrict the auxiliary equipment from being exposed to water.

Further, since the cylinder 43 is inclined, the center of gravity of the engine 4 is deviated to the inclined side. The weight balance (before and after the hull length) is improved. In addition, balancer shaft 5
Is arranged in the dead space below the intake pipe 6, the width of the engine 4 (the longitudinal dimension in the hull length direction) is reduced because the balancer shaft 5 does not increase the engine width in the direction perpendicular to the crankshaft 40. be able to. Further, since the balancer shaft 5 and the output shaft 41 are arranged on opposite sides of the crankshaft 40, interference between the balancer shaft 5 and the output shaft 41 can be avoided. That is, when the balancer shaft 5 and the output shaft 41 are arranged on the same side with respect to the crankshaft 40, the installation position of one of the shafts is increased, and thereby the installation positions of the engine 4 and the water jet propulsion device 3 are reduced. Lowering will be limited. However, when the balancer shaft 5 and the output shaft 41 are arranged on the opposite sides with respect to the crankshaft 40, the pump efficiency of the water jet propulsion machine 3 is improved by lowering the output shaft 41 while suppressing the engine height. Can be. This configuration is particularly advantageous for racing boats that require high output.

FIG. 4 is a front view of a hull of an engine installation portion showing another embodiment of the present invention, FIG. 5 is a front view of the engine of FIG. 4, and FIG. 6 is a plan layout of FIG. In these figures, an opening 200 is formed in the top plate 28 of the seat table above the engine 4 in the engine room 10, and the seat 20 is attached and detached via a packing 29 so as to cover the opening 200 with a seal structure. Opening 20 with possible mounting
0 is closed. The engine 4 is arranged so that the crankshaft 40 is located on the hull center line and extends in the hull length direction, the cylinder 43 is installed in a vertical direction, and the intake pipe 6 extends obliquely upward on one side of the engine. An intake box 61 is provided at the tip of the lever, and a cell motor 9 is disposed below the intake box 61. An exhaust pipe 44 is led out from the other side of the cylinder 43. Under the exhaust pipe 44, the balancer shaft 5 extends parallel to the crankshaft 40 and the bearing 5 near both ends.
00 supported and arranged. A gear 49 is provided at one end of the crankshaft 40.
By meshing with the gear 58 provided at one end of the balancer shaft 5, the balancer shaft 5 is interlocked with the crankshaft 40 so as to rotate at the same speed in the opposite direction to the crankshaft 40. Further, a gear 81 provided on the shaft of the fuel pump 80 meshes with the gear 58 of the balancer shaft 5.

In this configuration, the upper part of the engine 4 is located below the straddle-type seat 20 in the space formed between the foot steps 21 and the crankshaft 40 extends in the length direction of the hull. The engine 4 is arranged in the. Further, the exhaust pipes 44 derived from the two cylinders are assembled into one, and then connected to an exhaust expansion chamber (forming a part of the exhaust pipe) 440 disposed obliquely above the engine 4. The fuel pump 80 is disposed below the exhaust expansion chamber 440.

In the above configuration, the balancer shaft 5 is connected to the exhaust pipe 44.
, The width of the engine 4 can be reduced because the width of the engine 4 in the direction perpendicular to the crankshaft 40 does not increase even if the balancer shaft 5 is installed. Further, a part of the engine 4 is disposed in a space formed between a pair of left and right foot steps 21 disposed below the straddle-type seat 20 and on both sides thereof, and the crankshaft 40 has a hull length. In the configuration mounted so as to extend in the horizontal direction, the engine 4 can reduce the width in the hull width direction despite the arrangement of the balancer shaft 40.
The distance between the two is narrowed, and the maneuverability is improved. Further, the fuel pump 80, which is an auxiliary device, is connected to the balancer shaft 5 via gears 81 and 58 so that power is transmitted from the balancer shaft 5, so that there is no need to provide a separate driving device, and the driving device is not required. Can be simplified. Further, since the fuel pump 80 is disposed in the lower region of the exhaust expansion chamber 440, it is possible to prevent or limit the spray of the fuel pump 80 with water.

FIG. 7 is a side view of a hull showing a further embodiment of the present invention with a bow portion cut away, and FIG. 8 is a plan layout view of the engine of FIG. 7. In these figures, the engine 4 is a cylinder. 43 is provided inclining in the stern direction, and an exhaust pipe 44 is led out from the cylinder 43 toward above the crankshaft 40, and the crankshaft 40 is disposed horizontally on the hull so as to face the ship width direction. . The fuel tank 8 is arranged close to the cylinder 43 on the opposite side (bow side). An intake pipe 6 extends obliquely upward on a side opposite to the cylinder 43 of the engine.
A fuel pump 80 is disposed on the side opposite to the inclined side. A gear 81 provided on the shaft of the fuel pump 80 meshes with a gear 49 provided near the center of the crankshaft 40. A bevel gear 48 is provided near the center of the crankshaft 40, and a bevel gear 413 meshing with the bevel gear 48 is provided at one end of the output shaft 41.
The rotational force of the crankshaft 40 is transmitted to the output shaft 41 via the bevel gears 48 and 413. This output shaft 41 is orthogonal to the crankshaft 40,
It is located along the hull centerline.

On one side of the output shaft 41, the oil pump 7 is installed close to the output shaft 41, and a gear 7 provided on the shaft of the oil pump 7 is provided with respect to a gear 47 provided on the output shaft 41.
1 is engaged. Further, a starter motor 9 is provided on a side of the oil pump 7 (a side opposite to the output shaft 41), and a gear 91 provided on the shaft is connected to the crankshaft 4.
Gear 450 provided on flywheel 45 at the end of shaft 0
Is engaged. An outside air intake duct 11 for supplying air into the engine room 10 has a lower end opened between the engine 4 and the fuel tank 8, and the opening is located at substantially the same height as the installation position of the fuel pump 80. doing.
The other configuration is the same as the configuration in FIG.

In the above configuration, the fuel pump 80 is disposed on the front side of the engine 4 and the outside air intake duct 1
Since the outside air sent from 1 to the engine 4 passes through the portion of the fuel pump 80 disposed between the two,
The fuel pump 80 is sufficiently cooled,
In particular, since the lower end opening of the outside air intake duct 11 is located at substantially the same height as the installation position of the fuel pump 80, most of the outside air sent from the outside air intake duct 11 to the engine 4 is supplied to the fuel pump 80. And the cooling effect is excellent.

[0032]

According to the first aspect of the present invention, since the power of the auxiliary equipment is supplied from the crankshaft, it is not necessary to provide another power source for the auxiliary equipment. The overall configuration can be made compact. Further, in this configuration, the power take-out portion and the flywheel can be arranged near the bearings at both ends of the crankshaft, so that the durability of the crankshaft can be improved. Further, even when water enters through the opening, since the upper part of the accessory is covered with the intake pipe, the exhaust pipe or the cylinder of the engine, it is possible to prevent or limit the splash of water to the accessory.

According to the second aspect of the present invention, since there is no need to separately provide an accessory driving device, the accessory driving device can be simplified.

According to the third aspect of the present invention, the right and left weight balance of the hull is improved by arranging the auxiliary equipment near the center line in the hull length direction. In addition, since the accessory is driven by the output shaft instead of the impeller shaft, no torque for driving the accessory is applied to the connection between the impeller shaft and the output shaft, and the durability of the connection is not impaired.

According to the fourth aspect of the invention, the right and left weight balance of the engine is improved.

According to the fifth aspect of the present invention, a large auxiliary machine can be arranged by utilizing a dead space formed behind the crankshaft and beside the output shaft.

According to the sixth aspect of the present invention, the outside air sent from the outside air intake duct to the engine passes through the part of the auxiliary machine disposed between the two, so that the auxiliary machine is sufficiently cooled. Will be.

According to the seventh aspect of the present invention, most of the outside air sent from the outside air intake duct to the engine passes through the part of the auxiliary machine disposed between the two, so that the cooling of the auxiliary machine is sufficient. Will be performed.

[Brief description of the drawings]

FIG. 1 is a side view of a hull showing a preferred embodiment of the present invention with a bow portion cut away.

FIG. 2 is an enlarged view of an engine part of FIG.

FIG. 3 is a plan layout view of the engine of FIG. 1;

FIG. 4 is a front view of a hull of an engine installation part showing another embodiment of the present invention.

FIG. 5 is a front view of the engine of FIG. 4;

FIG. 6 is a plan layout view of the engine of FIG. 5;

FIG. 7 is a side view of another embodiment of the present invention in a state in which a bow is cut away.

FIG. 8 is a plan layout view of the engine of FIG. 7;

[Description of Signs] 2 Steering handle 3 Water jet propulsion machine 4 Engine 5 Balancer shaft 6 Intake pipe 7 Oil pump (Auxiliary machine) 9 Cell motor (Auxiliary machine) 10 Engine room 11 Duct for taking in outside air 20 Straddle seat 21 Footstep 22 Bull Work 27 Seat Table 40 Crankshaft 41 Output Shaft 43 Cylinder 44 Exhaust Pipe 45 Flywheel 80 Fuel Pump (Auxiliary Machine) 200 Opening Above Engine

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI F02B 67/04 F02B 67/04 G F02N 11/00 F02N 11/00 J

Claims (7)

[Claims] In a small boat having an opening covered with a detachable lid above an engine, a flywheel is attached to a front end of a crankshaft of the engine, and a rear end of the crankshaft or the crankshaft is provided. A power take-out portion is provided on the output shaft connecting the impeller shaft and the impeller shaft, and the crankshaft is supported by bearings near both ends thereof, and an auxiliary machine having a rotating shaft parallel to the crankshaft is provided.
The power take-out unit and the rotating shaft of the auxiliary machine are interlocked and connected, and at least a part of the auxiliary machine is covered with an intake pipe, an exhaust pipe, or an engine cylinder at an upper part thereof. Auxiliary equipment arrangement structure. 2. The accessory arrangement structure for an engine of a small boat according to claim 1, wherein the rotational force of the crankshaft is transmitted to the accessory via a balancer shaft. 3. An engine for a small boat, wherein a crankshaft is arranged laterally on the hull, and an output shaft is arranged near the hull centerline so as to extend in the lengthwise direction of the hull, and is interlockingly connected to the crankshaft. This output shaft is connected to the impeller shaft, and auxiliary components of the engine are arranged near the output shaft,
An auxiliary machine arrangement structure for an engine of a small boat, wherein a rotation shaft of the auxiliary machine is arranged in parallel with the output shaft in the vicinity of the output shaft and is connected to the output shaft. 4. The accessory arrangement structure for an engine of a small boat according to claim 3, wherein the accessory is arranged on both sides of the output shaft. 5. In a small boat engine, a crankshaft is disposed laterally on the hull, and an output shaft is disposed along the hull centerline so as to extend in the hull length direction and is interlocked with the crankshaft. An auxiliary machine arrangement structure for an engine of a small boat, wherein auxiliary machines are arranged behind the crankshaft and beside the output shaft. 6. An engine for a small boat, wherein a crankshaft is disposed laterally on the hull, and an output shaft is disposed so as to extend in a longitudinal direction of the hull, and is interlocked with the crankshaft;
An engine for a small boat, wherein an auxiliary device driven by an external air intake duct and a crankshaft is disposed in front of the engine, and the auxiliary device is disposed between the external air intake duct and the engine. Auxiliary equipment arrangement structure. 7. The accessory arrangement structure for an engine of a small boat according to claim 6, wherein a lower end opening portion of the outside air intake duct is disposed at substantially the same height as the accessory.