JP2001132470A - Outboard engine with supercharger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make an outboard engine compact by reducing the number of the constitution parts of an engine and lowering the entire height of the engine. SOLUTION: In the outboard engine with a supercharger, in which a crankshaft is mounted vertically so as to point to a vertical direction and a mechanical drive type supercharger is attached, constituted so as to transmit the rotation of the crankshaft to the supercharger by a drive belt, a power generation device 43 is driven by a drive belt 53 and installed so as to be contacted/separated to/from the crankshaft 3 and supercharger 31 and the power gneration device 43 itself is made the tensioner of the drive belt 53.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outboard motor engine with a supercharger provided with a mechanically driven supercharger.

[0002]

2. Description of the Related Art An engine of an outboard motor is mounted vertically so that its crankshaft is oriented vertically, and the rotation of the crankshaft is transmitted to a screw propeller via a drive shaft extending downward. By the way, in recent years, a four-stroke engine has become mainstream as an outboard motor engine instead of a two-stroke engine from the viewpoint of environmental protection. If it is left as it is, the displacement will be increased and the engine size will be larger than that of the two-stroke engine.

Therefore, the engine 1 shown in FIGS.
As shown in FIG. 01, there is a type in which a mechanically driven supercharger (supercharger) 102 is additionally provided to increase the intake charging efficiency and improve the output. In this case, the supercharger 102 is installed in front of the engine 101 or the like, and the output of the crankshaft 103 is transmitted to the supercharger 102 by the drive belt 104. And the tension (tension) of the drive belt 104
Is provided. On the other hand, a power generator (generator) 107 is built in a flywheel 106 which is provided integrally with the upper end of the crankshaft 103 so as to rotate.

[0004]

However, since it is necessary to provide the tensioner 105 for the drive belt 104 as described above, there is a problem that the number of components of the engine 101 increases. In addition, flywheel 10
Since the power generator 107 is built in the flywheel 6, the thickness of the flywheel 106 is increased and the overall height of the engine 101 is increased, which leads to an increase in the size of the outboard motor.

[0005] An outboard motor engine with a supercharger according to the present invention comprises:
It is an object of the present invention to solve the above problems, and an object of the present invention is to reduce the number of components of an engine and to reduce the overall height of the engine to make the outboard motor more compact.

[0006]

To achieve the above object, an outboard motor with a supercharger according to the present invention has a crankshaft extending vertically as described in claim 1 of the appended claims. An outboard motor with a supercharger, which is vertically mounted so as to face and is provided with a mechanically driven supercharger, and is configured to transmit the rotation of the crankshaft to the supercharger by a drive belt. A power generator is driven by the drive belt, and the power generator is installed so as to be able to approach and separate from a crankshaft and a supercharger, and the power generator itself is used as a tensioner for the drive belt.

[0007] According to the above configuration, since the tension of the drive belt can be adjusted by adjusting the position of the power generation device, it is not necessary to provide a dedicated tensioner as in the related art, thereby reducing the number of components of the engine. be able to. In addition, since the power generator does not need to be built into the flywheel as in the related art, the thickness of the flywheel can be reduced, the overall height of the engine can be reduced, and the outboard motor can be made more compact.

The outboard motor engine with a supercharger according to the present invention is mechanically driven by being vertically mounted such that the crankshaft is oriented vertically, as described in claim 2 of the claims. In an outboard engine with a supercharger, which is provided with a supercharger of the type and configured to transmit the rotation of the crankshaft to the supercharger, a drive gear is integrally provided at the upper end of the crankshaft. On the other hand, a driven gear is integrally provided at the upper end of the input shaft of the supercharger, and the rotation of the crankshaft is transmitted to the supercharger by meshing the drive gear and the driven gear.

When the supercharger is driven by a gear as described above, a tensioner for a driving belt when the supercharger is driven by a belt becomes unnecessary, so that the number of components of the engine can be reduced. Further, since the position of the flywheel can be lowered by the width of the drive belt as compared with the case where the supercharger is driven by a belt, the overall height of the engine can be reduced and the outboard motor can be made compact.

Further, an outboard motor engine with a supercharger according to the present invention has the following features.
In the configuration of claim 2, a pinion gear of a starter motor is provided in the same row as the drive gear and the driven gear, and rotation of the pinion gear is transmitted to one of the drive gear and the driven gear to start the engine.

With this configuration, the drive gear for driving the supercharger is also used as the engine starting gear, so that it is possible to reduce the number of gears and contribute to the reduction in the number of engine components. it can.

[0012] The outboard motor engine with a supercharger according to the present invention has the following features.
In the configuration of claim 2, the drive gear is provided integrally with a flywheel that is provided integrally with the upper end of the crankshaft for rotation.

According to the above construction, the flywheel can be made thinner than when the flywheel and the drive gear are separately provided, so that the overall height of the engine can be reduced and the outboard motor can be made compact. .

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a left side view showing an example of an outboard motor to which the present invention is applied, in which a left side is a front side (hull side) and a right side is a rear side.

The engine 2 mounted on the uppermost part of the outboard motor 1 is, for example, an in-line four-cylinder four-stroke engine. The engine 2 is installed vertically so that the crankshaft 3 is directed vertically, and the crankcase 4 , A cylinder block 5, a cylinder head 6, and a head cover 7 are fixed on the engine holder 8 in a direction in which they are arranged in order from the front.

The crankshaft 3 is rotatably supported between the crankcase 4 and the cylinder block 5, and has four cylinder bores 10 inside the cylinder block 5 as shown in FIG.
Are formed horizontally, and pistons 11 slidably inserted into these cylinder bores 10 are connected to the crankshaft 3 by connecting rods 12. Further, the rotation of the crankshaft 3 is transmitted to the camshaft 13 supported in the cylinder head 6 by a camshaft drive mechanism (not shown) at a reduced speed of ２, and the valve train incorporated in the cylinder head 6. 14 is driven.

On the other hand, an oil pan 15 is fixed to the lower surface of the engine holder 8, and a drive housing 16 and a gear housing 17 are sequentially connected to a lower portion thereof. In addition,
The engine 2, the engine holder 8 and the oil pan 15 are covered with an engine cover 18 to be waterproof. Also,
A clamp bracket 19 for attaching the outboard motor 1 to the stern of the hull is provided at the front of the engine holder 8, the oil pan 15, and the drive housing 16.

A vertically extending drive shaft 21 is supported behind the crankshaft 3 by an offset shaft. A driven gear 22 at the upper end of the drive shaft 21 meshes with a drive gear 23 at the lower end of the crankshaft 3, while the lower end of the drive shaft 21 is And cooperates with a propeller shaft 24 horizontally supported in the gear housing 12 through a bevel gear 25. Therefore, the rotation of the crankshaft 3 is transmitted to the propeller shaft 24 via the drive shaft 21, and the screw propeller 26 provided at the rear end of the propeller shaft 24 rotates to generate a propulsive force in the outboard motor 1.

FIGS. 2 and 3 show the first embodiment of the present invention, respectively.
FIG. 2 is a longitudinal sectional view and a plan view of the engine according to the embodiment. As shown here, a mechanically driven supercharger 31 (supercharger) is provided in front of the engine 2. The supercharger 31 is fastened and fixed to the front surface of the crankcase 4 by, for example, four fixing bolts 33 so that the input shaft 32 is parallel to the crankshaft 3.

An intercooler 35 is installed on the right side of the supercharger 31, and a surge tank 36 is installed on the rear of the intercooler 35, that is, on the right side of the crankcase 4. The intake pipe 37 is connected to an intake port 38 opened on the right side of the cylinder head 6.

Further, on the left side of the crankcase 4, a throttle body 39 and an air cleaner 40 connected to the upstream side of the supercharger 31 are provided, and an air chamber 40 and an exhaust chamber 41 provided on the left side of the crankcase 4 are provided.
The starter motor 42 is installed in the space between the starter motor 42 and the starter motor 42. Above the throttle body 39, a power generator (generator) 43 is provided with its input shaft 44 parallel to the crankshaft 3.

The power generator 43 includes, for example, two bolts 46.
a, 46b attached to the engine 2. Here, for example, the bolt hole 47 into which the front bolt 46a is inserted is formed in an arc shape centering on the rear bolt 46b. Therefore, when the two bolts 46a and 46b are loosened, the power generation device 43 can move in a manner to rotate around the bolt 46b, and comes into contact with and separates from the crankshaft 3 and the supercharger 31. Therefore, the position of the power generator 43 can be adjusted within the moving range, and after the position adjustment, the two bolts 46a and 46b are tightened to fix the power generator 43.

On the other hand, the crankshaft 3 protrudes from the upper surface of the engine 2, and a drive pulley 4
A flywheel 9 is provided on the upper side so as to be integrally rotatable. The flywheel 50 is a rotating member that increases the rotational inertia of the crankshaft 3 to keep the rotation of the engine 2 smooth, and has a structure in which a ring gear 50b is fixed to the outer periphery of a main body 50a by press fitting or the like.

On the other hand, a driven pulley 51 is provided at the upper end of the input shaft 32 of the supercharger 31 so as to rotate integrally therewith.
A driven pulley 52 is provided at the upper end of the third input shaft 44 so as to rotate integrally therewith. The drive pulley 49 of the crankshaft 3 and the driven pulley 51 of the turbocharger 31
The drive belt 53 is wound around the driven pulley 52 of the power generator 43.

The engine 2 configured as described above is started by starting the starter motor 42. When the starter motor 42 starts, its pinion gear 42a
Meshes with the ring gear 50b of the flywheel 50,
The rotational force of the starter motor 42 is the ring gear 50b
The engine 2 is started by being transmitted from the (flywheel 50) to the crankshaft 3. After starting the engine 2,
The rotation of the crankshaft 3 is controlled by the drive belt 53 so that the supercharger 31
To the input shaft 32 of the power generator 43 and the input shaft 44 of the power generator 43,
The supercharger 31 and the power generator 43 are driven.

When the supercharger 31 is driven, the intake air taken into the air cleaner 40 is supplied to the throttle body 3.
9, compressed in the supercharger 31, further cooled by the intercooler 35 to increase the air density, and supplied to the intake port 38 of the cylinder head 6 through the surge tank 36 and the intake pipe 37. This intake air contains
Near the end of the intake pipe 37 or the intake port 3
Fuel is injected from a fuel injection device (not shown) inside 8, and the intake air is supplied to the engine 2 as a fuel mixture.

The flow rate of the intake air flowing into the supercharger 31 changes according to the opening degree of the throttle body 39, whereby the output of the engine 2 is adjusted. As described above, the intake air is compressed by the supercharger 31 and supplied to the engine 2, so that the intake charging efficiency is increased as compared with the case of natural intake and the output of the engine 2 can be improved. On the other hand, the power generation device 43 is driven to generate power, and the outboard motor 1
(Engine 2) is supplied with power.

To adjust the tension of the drive belt 53, when the engine 2 is stopped, the two bolts 46a and 46b fixing the power generation device 43 are loosened as described above, and the power generation device 43 is rotated about the bolt 46b. This is done by causing That is, the tension of the drive belt 53 is
By rotating the bolt 3b outward (left side) around the bolt 46b, the strength increases, and by rotating the bolt 3b inside (right side), the strength decreases. And
At the position where the tension is optimized, the two bolts 46a, 4
If the power generator 43 is fixed by tightening 6b, the tension adjustment is completed.

As described above, since the power generation device 43 itself functions as a tensioner for the drive belt 53, it is not necessary to provide a dedicated tensioner as in the related art, and the number of components of the engine 2 can be reduced.
Moreover, since the power generator 43 does not need to be built into the flywheel 50, the thickness of the flywheel 50 can be reduced by that much, the overall height of the engine 2 can be reduced, and the outboard motor 1 can be made more compact.

The power generator 43 is connected to the flywheel 50.
It is not necessary to provide a hollow portion for the installation of a power generator on the lower surface side of the flywheel 50 unlike the related art, so that a sufficient rotational inertia force can be obtained even with a thin flywheel 50. Thus, the rotation of the engine 2 can be kept smooth.

FIGS. 4 and 5 show the second embodiment of the present invention, respectively.
FIG. 2 is a longitudinal sectional view and a plan view of the engine according to the embodiment. The configuration of the second embodiment is different from that of the first embodiment in that the supercharger 31 is driven by the crankshaft 3 via a gear, and that the power generator is incorporated inside the flywheel. This is the point, and the configuration of other parts is the same as that of the first embodiment.

Here, a flywheel 61 is provided integrally with the upper end of the crankshaft 3, and a drive gear 62 is provided integrally therearound by press fitting or the like. A power generator 63 is built in the lower surface of the flywheel 61.

On the other hand, a driven gear 64 is integrally provided at the upper end of the input shaft 32 of the supercharger 31, and the driven gear 64 meshes with the drive gear 62. further,
A pinion gear 42 a of the starter motor 42 is provided in the same row as the drive gear 62 and the driven gear 64, and the pinion gear 42 a is linked to the drive gear 62 via a reduction gear 65. The reduction gear 65 is supported, for example, by the crankcase 4 of the engine 2.

The engine 2 is configured as described above. In this engine 2, the starter motor 42
Is started, the pinion gear 42a meshes with the reduction gear 65, the rotation of the pinion gear 42a is transmitted from the reduction gear 65 to the drive gear 62 (flywheel 61), and the crankshaft 3 rotates to start the engine 2. After the start of the engine 2, the rotation of the crankshaft 3 is transmitted to the input shaft 32 of the supercharger 31 by the drive gear 62 and the driven gear 64, and the supercharger 31 is driven. In addition, power is generated in the power generation device 63 by the rotation of the flywheel 61.

When the supercharger 31 is driven by a gear as in the engine 2, a tensioner for a drive belt when the supercharger 31 is driven by a belt becomes unnecessary, so that the number of components of the engine 2 is reduced. In addition, the tension adjustment can be omitted to make maintenance free. Moreover, the position of the flywheel 61 can be reduced by the width of the drive belt as compared with the case where the supercharger 31 is driven by a belt, so that the overall height of the engine 2 is reduced and the outboard motor 1 is made compact. be able to.

As in the case of the engine 2, the pinion gear 42a of the starter motor 42 is
2 and the driven gear 64, and the drive gear 62 is driven by the pinion gear 42 a to drive the engine 2.
Is started, the drive gear 62 for driving the supercharger 31 can also be used as an engine starting gear, thereby reducing the number of gears and the number of components of the engine 2. it can.

Further, since the drive gear 62 is provided integrally with the flywheel 61, the flywheel 61
The thickness of the flywheel 61 can be reduced as compared with the case where the drive gear 62 and the drive gear 62 are separately provided, and the overall height of the engine 2 can be reduced to contribute to the downsizing of the outboard motor 1.

In the second embodiment, the pinion gear 42a of the starter motor 42 drives the drive gear 62. However, the driven gear 64 may be driven by the pinion gear 42a to start the engine. Further, the pinion gear 42a and the drive gear 6
The drive gear 62 and the driven gear 64 may be directly driven by the pinion gear 42 a without interposing the reduction gear 65 between the drive gear 62 and the pinion gear 42.

[0039]

As described above, the outboard motor with a supercharger according to the present invention also drives the power generator by the drive belt for transmitting the rotation of the crankshaft to the supercharger, and the power generator is driven by the drive belt. Since the power generator is used as a tensioner for the drive belt by installing it so as to be able to contact and separate from the crankshaft and the supercharger, there is no need to provide a tensioner dedicated to the drive belt, and the number of engine components is reduced. At the same time, it is not necessary to incorporate the power generator into the flywheel, so that the thickness of the flywheel can be reduced, the overall height of the engine can be reduced, and the outboard motor can be made more compact.

Further, in the outboard motor with a supercharger according to the present invention, the drive gear is provided integrally with the upper end of the crankshaft while the driven gear is provided integrally with the upper end of the input shaft of the supercharger. Since the rotation of the crankshaft is transmitted to the supercharger by meshing the gear and the driven gear, the number of engine components is reduced by eliminating the need for a drive belt tensioner when the supercharger is driven by a belt. In addition, the position of the flywheel can be lowered by the width of the drive belt as compared with the case where the turbocharger is driven by a belt, so that the overall height of the engine can be reduced and the outboard motor can be made more compact.

Further, in the outboard motor with a supercharger according to the present invention, a pinion gear of a starter motor is provided in the same row as the drive gear and the driven gear, and the rotation of the pinion gear is transmitted to one of the drive gear and the driven gear. Since the engine is started, the drive gear for driving the turbocharger is also used as the engine starting gear, and the number of gears can be reduced, thereby contributing to a reduction in the number of engine components.

Further, in the outboard motor with a supercharger according to the present invention, since the drive gear is integrally provided on a flywheel which is provided integrally with the upper end of the crankshaft, the flywheel and the drive gear are separately provided. The thickness of the flywheel can be reduced compared to the case where it is installed in the car, and the overall height of the engine can be reduced, contributing to downsizing of the outboard motor.

[Brief description of the drawings]

FIG. 1 is a left side view showing an example of an outboard motor to which the present invention is applied.

FIG. 2 is a longitudinal sectional view of the engine showing the first embodiment of the present invention.

FIG. 3 is a plan view of the engine showing the first embodiment of the present invention.

FIG. 4 is a longitudinal sectional view of an engine showing a second embodiment of the present invention.

FIG. 5 is a plan view of an engine showing a second embodiment of the present invention.

FIG. 6 is a longitudinal sectional view of an engine showing a conventional technique.

FIG. 7 is a plan view of an engine showing a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outboard motor 2 Engine 3 Crankshaft 31 Supercharger 32 Input shaft 42 Starter motor 42a Pinion gear 43 Power generation device 53 Drive belt 61 Flywheel 62 Drive gear 64 Driven gear 65 Reduction gear

Claims (4)

[Claims] 1. A machine-driven supercharger is mounted vertically with a crankshaft facing vertically, and the rotation of the crankshaft is transmitted to the supercharger by a drive belt. In the turbocharged outboard engine with a supercharger, the power generation device 43 is driven by the drive belt 53, and the power generation device 43 is installed so as to be able to approach / separate from the crankshaft 3 and the supercharger 31. Is a tensioner for the drive belt 53. An outboard engine with a supercharger. 2. A supercharger which is vertically mounted so that a crankshaft is oriented vertically, is provided with a mechanically driven supercharger, and is configured to transmit rotation of the crankshaft to the supercharger. In the outboard motor engine with the charge, the crankshaft 3
The drive gear 62 is provided integrally with the upper end of the input shaft 32 of the supercharger 31, while the drive gear 62 is provided integrally with the drive gear 62 at the upper end of the supercharger 31.
An outboard motor with a supercharger, characterized in that the rotation of the crankshaft (3) is transmitted to the supercharger (31) by interlocking the four. 3. A pinion gear 4 of a starter motor 42 with respect to the drive gear 62 and the driven gear 64.
The outboard motor engine with a supercharger according to claim 2, wherein the engine is started by transmitting the rotation of the pinion gear (42a) to one of the drive gear (62) and the driven gear (64). 4. An outboard motor engine with a supercharger according to claim 2, wherein said drive gear 62 is integrally provided on a flywheel 61 which is integrally provided with an upper end of said crankshaft 3 for rotation.