JPH10175596A - Engine hanger device for outboard motor - Google Patents

Abstract

(57) [Problem] To rationally arrange a pair of secondary balancer shafts and an engine hanger without increasing the size of an engine block. A pair of secondary balancer shafts (37, 38) are supported by a cylinder block (6) behind a crankshaft (15) vertically arranged so as to sandwich a cylinder axis (L) from left and right. And crankshaft 1
5 is connected with an endless belt 54. A tension pulley 57 for applying tension to the endless belt 54 is connected to the cylinder axis L.
An engine hanger 66 for suspending the outboard motor is disposed outside the loop of the endless belt 54 and on the left side of the cylinder axis L.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine hanger device for an outboard motor equipped with an engine having a pair of balancer shafts in a cylinder block.

[0002]

2. Description of the Related Art Japanese Patent Application Laid-Open No. 4-337143 discloses an engine for an outboard motor in which a crankshaft is arranged vertically and provided with a pair of secondary balancer shafts. An outboard motor engine having a vertically arranged crankshaft and having an engine hanger on the upper surface of a cylinder block is known from Japanese Utility Model Laid-Open No. 3-76799.

[0003]

By the way, the one disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 4-337143 discloses a pair of crankcases connected to the front surface of a cylinder block.
Since the secondary balancer shaft is supported, the crankcase overhangs (that is, on the hull side) when trying to secure the space for the secondary balancer shaft, which hinders the layout of auxiliary equipment around the crankcase. There is a possibility. Further, Japanese Unexamined Utility Model Publication No. 3-77799 does not include a balancer shaft, and thus does not mention the relationship between the engine hanger and the balancer shaft.

[0004] The present invention has been made in view of the above-mentioned circumstances, and a pair of two-piece motors is provided without increasing the size of the engine block.
The purpose is to arrange the next balancer shaft and the engine hanger rationally.

[0005]

In order to achieve the above object, according to the first aspect of the present invention, a pair of balancer shafts are supported on both left and right sides of a cylinder block sandwiching a cylinder axis. A tension pulley for applying tension to the endless transmission band is provided on the side, and an engine hanger for suspending the outboard motor is provided outside the endless transmission band loop on the other side of the axis, so that the balancer shaft, the endless transmission The band, the tension pulley and the engine hanger can be laid out so as not to interfere with each other on the upper surface of the cylinder block.

According to the second aspect of the invention, the tension pulley for applying tension to the endless transmission band for driving the camshaft and the tension pulley for applying tension to the endless transmission band for driving the balancer shaft are vertically overlapped. Since they are arranged in a wrapped manner, the space on the upper surface of the cylinder block can be used more effectively, and the size of the cylinder block can be reduced.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 7 show an embodiment of the present invention. FIG. 1 is an overall side view of an outboard motor, FIG. 2 is an enlarged sectional view taken along line 2-2 of FIG. 1, and FIG. 4 is a view taken in the direction of arrow 4 in FIG. 3, FIG. 5 is a sectional view taken along line 5-5 in FIG. 2, FIG. 6 is a sectional view taken along line 6-6 in FIG. 3, and FIG. FIG.

As shown in FIG. 1, an outboard motor O includes a mount case 2 coupled to an upper portion of an extension case 1.
The water-cooled in-line 4-cylinder 4-cycle engine E is supported on the upper surface of the mount case 2 with the crankshaft 15 placed vertically. An undercase 3 having an open upper surface is coupled to the mount case 2, and an engine cover 4 is detachably mounted on an upper portion of the undercase 3.
An under cover 5 is mounted between the lower edge of the under case 3 and the edge near the upper end of the extension case 1 so as to cover the outside of the mount case 2.

The engine E includes a cylinder block 6, a crankcase 7, a cylinder head 8, a head cover 9, a lower belt cover 10, and an upper belt cover 11, and the lower surfaces of the cylinder block 6 and the crankcase 7 Supported on top. The pistons 13 are slidably fitted to the four cylinders 12 formed in the cylinder block 6, respectively.
3 are connected to a vertically disposed crankshaft 15 via connecting rods 14.

The flywheel 1 is provided at the lower end of the crankshaft 15.
The drive shaft 17 connected with the extension case 6 extends downward inside the extension case 1, and the lower end thereof is connected to the gear case 18.
Is connected to a propeller shaft 21 having a propeller 20 at the rear end via a bevel gear mechanism 19 provided inside the. A lower end of a shift rod 22 is connected to a front portion of the bevel gear mechanism 19 so as to switch the rotation direction of the propeller shaft 21.

A swivel shaft 25 is fixed between an upper mount 23 provided on the mount case 2 and a lower mount 24 provided on the extension case 1. A swivel case 26 rotatably supports the swivel shaft 25.
Is supported by a stern bracket 27 attached to the stern S via a tilt shaft 28 so as to be vertically swingable.

An oil pan 2 is provided on the lower surface of the mount case 2.
9 and the exhaust pipe 30 are connected. Exhaust gas discharged from the exhaust pipe 30 into the internal space of the extension case 1 passes through the internal space of the gear case 18 and the inside of the boss of the propeller 20 and is discharged into water.

As apparent from FIG. 2, the engine E housed in the engine room 36 defined by the under case 3 and the engine cover 4 has two secondary balancer shafts arranged in parallel with the crankshaft 15. 37, 38,
And one cam shaft 39. Secondary balancer shaft 37,
38 is supported by the cylinder block 6 closer to the cylinder head 8 than the crankshaft 15, and the camshaft 39 is supported by the mating surface of the cylinder head 8 and the head cover 9.

A pulley assembly 44 in which a camshaft drive pulley 40, a secondary balancer shaft drive pulley 41, a generator drive pulley 42, and a cooling fan 43 are integrated is fixed to the upper end of the crankshaft 15. The camshaft driven pulley 45 fixed to the upper end of the camshaft 39 and the camshaft driving pulley 40 are connected by an endless belt 46. Camshaft drive pulley 40
Is set to one half of the diameter of the camshaft driven pulley 45, so that the camshaft 39 rotates at half the speed of the crankshaft 15. Arm 4 pivoted by pin 47
A tension pulley 49 provided at one end of the endless belt 8 is pressed against the outer surface of the endless belt 46 by the resilience of a spring 50, thereby applying a predetermined tension to the endless belt 46.

As is apparent from FIGS. 2 and 5, the right secondary balancer shaft 37 and the left two balancer shafts 3 sandwich the four cylinders 12 formed in the cylinder block 6 therebetween.
8 are arranged vertically. A balancer shaft support member 69 and an intermediate shaft support member 70 are provided on the upper surface of the cylinder block 6.
The upper end of the right secondary balancer shaft 37 projects upward from the upper surface of the cylinder block 6 and extends into the support members 69 and 70, and the intermediate shaft 51
Are rotatably supported by the intermediate shaft support member 70. A secondary balancer shaft driven pulley 52 is fixed to an upper end of the intermediate shaft 51 extending upward from the intermediate shaft support member 70, and an intermediate gear 71 provided at a lower end of the intermediate shaft 51 is connected to an upper end of the right secondary balancer shaft 37. And meshes with the intermediate gear 72 provided at the second position.

The right secondary balancer shaft 37 is provided with three journal portions 37 _1, 37 _2, 37 _3, and its offset from the rotation axis of two balancer weight portions 37 _4, 37 _5, the upper both the journal portion 37 ₁ of is supported on the balancer shaft supporting member 69, the central and lower 2
The number of journal portion 37 _2, 37 _3, is rotatably supported on the journal supporting part 6 _and 62 formed in the cylinder block 6.

[0018] includes a left secondary balancer shaft 38 journal portion 38 ₁ 3, 38 _2, 38 _3, and its offset from the rotation axis of two balancer weight portions 38 _4, 38 _5, The three journals 38 ₁ , 3
8 _2, 38 ₃ is rotatably supported by three journal supporting part 6 _{3 through 65} formed in the cylinder block 6, respectively. Left secondary balancer shaft 38 projecting upward through cap member 73 provided on the upper surface of cylinder block 6
A secondary balancer shaft driven pulley 53 is provided at the upper end of the shaft. The secondary balancer shaft driven pulley 41 is connected to a pair of secondary balancer shaft driven pulleys 52 and 53 by an endless belt 54. A tension pulley 57 provided at one end of an arm 56 pivotally supported by a pin 55
The endless belt 54 is pressed against the outer surface of the endless belt 54 by a resilient force of 8 to apply a predetermined tension to the endless belt 54. Thus, the pair of secondary balancer shafts 37 and 38 rotate in directions opposite to each other at twice the speed of the crankshaft 15.

As is apparent from FIG. 6, the crankshaft 15
The cylinder block 6 and the crankcase 7 are connected to each other at a dividing surface 31 passing through the center of the cylinder block 6.
, The cylinder block 6 and the crankcase 7 are integrally fastened. Both secondary balancer shaft 3
7 and 38 are supported not by the crankcase 7 but by the cylinder block 6, so that the bolts 32 for fastening the crankcase 7 to the cylinder block 6 do not interfere with both the secondary balancer shafts 37 and 38. The degree of freedom in the layout of the two secondary balancer axes 37 and 38 is greatly increased.

The crankcase 9 has three oil passages 7 _{1 to} 7.
₃ are formed in the vertical direction, the crank shaft 15 is lubricated by the oil passage 7 ₄ which branches from the oil passage ₇₁ in the horizontal direction,
Oil passage 7 ₅ branched from the oil passage 7 _2, 7 ₃ in the horizontal direction,
6 _6; 7 _6, 6 ₇ by both secondary balancer shaft 37 and 38
Is lubricated.

Returning to FIG. 2, a bracket 60 fixed to the upper surface of the crankcase 7 with two bolts 59, 59
The generator 62 is supported by the two bolts 61,61. Generator driven pulley 64 fixed to rotating shaft 63 of generator 62
And the generator driving pulley 42 are connected by an endless belt 65, and the generator 62 is driven by the crankshaft 15. By thus providing the generator 62 separately from the engine E, it is possible to use a general-purpose generator 62 as compared with a case where the generator is incorporated into a flywheel provided on the crankshaft 15. This is advantageous in cost, and the capacity of the generator 62 can be easily increased.

Cam shaft 39, secondary balancer shafts 37, 38
And three belts 46, 54, 6 for driving the generator 62
5 is a lower belt cover 10 and an upper belt cover 11
Is housed inside the belt chamber 68 defined by. under
The belt cover 10 has an opening 1 surrounding the generator 62.
0₁And on the right bottom wall of the crankshaft 15
Multiple slits 10_TwoAre provided, and these openings 1
0₁And slit 10 _TwoEmpty in the belt chamber 68 via ...
Qi is introduced.

2 to 4, a pair of left and right slit-shaped air intakes 4 ₁ and 4 ₁ (only the left side is shown in FIG. 2) are formed on the upper rear surface of the engine cover 4. The air intakes 4 ₁ , 4 ₁
A guide plate 75 extending forward from a lower edge of the engine cover 4 is fixed to the inner surface of the engine cover 4. Therefore, the air intake 4 ₁ ,
Air sucked from 4 ₁ flows forwards through a space between the wall and the guide plate 75 on the engine cover 4, it flows from the front edge of the guide plate 75 in the engine room 36. A ventilation duct 75 ₁ is provided on the right side of the guide plate 75 (see FIG. 4).
Communicating There are formed, the lower end of the ventilation duct 75 ₁ communicates with the opening 11 ₁ formed in the right side of the upper belt cover 11, the opening 4 ₂ in which the upper end is formed on the upper right side of the engine cover 4 I do. This ventilation duct 75
By means of ₁ , the belt chamber 68 surrounded by the lower belt cover 10 and the lower belt cover 11 communicates with outside air to perform ventilation.

The upper ends of the secondary balancer shafts 37 and 38 and the upper end of the crankshaft 15 project from the upper surface of the cylinder block 6 into a belt chamber 68 surrounded by the belt covers 10 and 11, and are endless inside the belt chamber 68. Since the power transmission means is connected by the power transmission means composed of the belt 54, not only can the power transmission means be protected from dust and seawater, but also maintenance is easier compared to the case where the power transmission means is housed inside the cylinder block 6. become. Moreover, since the belt chamber 68 which ventilation is performed between the outside air through the ventilation opening 75 ₁ can be prevented effectively cooled to the temperature rise of power transmission means.

As is apparent from FIG. 2, a tension pulley 57 abutting on an endless belt 54 stretched between a pair of secondary balancer shaft driven pulleys 52 and 53, and a cam shaft 3
9. The tension pulley 49 of the driving endless belt 46 is disposed so as to be substantially overlapped with the tension pulley 49 in the vertical direction, and is disposed at a position deviated rightward with respect to the axis L of the cylinders 12 provided in the cylinder block 6. . At a position deviated leftward with respect to the axis L, an engine hanger 66 used for suspending the outboard motor O is provided with two bolts 6.
7, 67 fixed. The engine hanger 66 is disposed outside the loop of the endless belt 54 for driving both the secondary balancer shafts 37 and 38, and is disposed so as to straddle above the endless belt 46 of the cam shaft 39.

Thus, both secondary balancer shafts 37, 3
Even if the space on the upper surface of the cylinder block 6 becomes insufficient by disposing the endless belt 54 for driving on the upper surface of the cylinder block 6, the tension pulley 49,
By arranging the 57 and the engine hanger 66 separately on the left and right of the axis L of the cylinders 12, it is possible to effectively use a small space and to reduce the size of the cylinder block 6. Also, the tension pulley 57 of the endless belt 54 for driving the two secondary balancer shafts 37 and 38 and the tension pulley 49 of the endless belt 46 for driving the camshaft 39 are arranged so as to be substantially overlapped in the vertical direction.
Effective use of space is achieved.

When the engine cover 4 is removed, the engine hanger 66 is exposed on the upper surface of the upper belt cover 11, and as shown in FIG. Can be lifted. At this time, the engine hanger 66
Is located slightly behind the center of gravity CG of the outboard motor O, so that the suspended outboard motor O is at a predetermined angle α (eg, about 5 °) with respect to the vertical line VL. The operation of fixing the stern bracket 27 to the stern S by leaning forward and the operation of removing the stern bracket 27 from the stern S can be easily performed.

Next, the structure of the intake system and the fuel supply system of the engine E will be described with reference to FIGS.

An intake silencer 76 is fixed to the front of the crankcase 7 with three bolts 77. The intake silencer 76 includes a box-shaped main body 78 and a duct 79 connected to a left side surface of the main body 78. The duct portion 79 has an intake opening 79 that opens downward at the lower end thereof.
Provided with a _1, and a communicating hole 79 ₂ communicating with the internal space of the main body portion 78 at its upper end. Intake silencer 7
The throttle body 80 disposed on the right side of the main body 78 is connected to the main body 78 via the flexible short intake duct 35.

The throttle body 80 is connected and fixed to an intake manifold 85 described below. Elbow 81, surge tank 82, and four intake pipes 83a, 83b, 83
An intake manifold 85 integrally provided with c and 83d and a mounting flange 84 is arranged along the right side of the engine E. The elbow 81 changes the flow of intake air from a flow along the front surface of the crankcase 7 to a flow along the right side surface of the crankcase 7 by approximately 90 °, and may be a duct having flexibility. In this embodiment, the surge tank 82, the intake pipes 83a, 83b, 83c, 83d and the mounting flange 8 are provided for supporting and fixing the throttle body 80.
4 and one.

The connecting portion between the elbow 81 and the surge tank 82 of the intake manifold 85 has a dimension vertically smaller than the upper and lower ends of the surge tank 82, and the bolts 86 ₁ , 86 ₁ ; 86 ₂ at this portion. , 86 ₂
And two brackets 86 ₃ , 86 ₃ having loose holes
Thus, the mounting flange 84 is fixed to the right side surface of the cylinder head 8 with a plurality of bolts 87.

On the rear surface of the head cover 9, two low-pressure fuel pumps 88, 88 are provided in parallel, and the low-pressure fuel pumps 88, 88 allow a fuel tank (not shown) provided on the ship to move the cylinder block 6 from the fuel tank (not shown). Fuel is supplied to a sub tank 89 provided on the right side surface. Inside the sub tank 89, a float valve 90 for adjusting the fuel level is provided.
A high-pressure fuel pump 91 is housed therein, and the fuel pressurized by the high-pressure fuel pump 91 is supplied to the lower end of a fuel rail 93 via a high-pressure filter 92. The mounting flange 84 of the intake manifold 85 is provided with four fuel injection valves 94 corresponding to the four cylinders 12, and these fuel injection valves 94 are supplied with fuel from the fuel rail 93. . A regulator 95 provided at the upper end of the fuel rail 93 adjusts the pressure of the fuel supplied to the fuel injection valves 94 and returns the excess fuel to the sub tank 89.

As is apparent from FIG. 2, the intake manifold
The air flowing through the valve 85 is injected from the fuel injection valves 94.
Mixed with the fuel, and formed in the intake port formed in the cylinder head 8.
To 8 ₁From combustion chamber 8_TwoExhaust gas and exhaust gas
To 8_ThreeFrom the exhaust passage 8_FourThrough the exhaust pipe 30 (see FIG. 1).
). Exhaust passage 8_FourIs the cylinder block
6 on the opposite side to the intake manifold 85 located on the right side
It is formed on the left side of the cylinder block 6 in the vertical direction.

Inside the engine room 36, furthermore, an electrical box 96 and a cartridge type oil filter 97 are provided.
Is arranged. The electrical box 96 is a cylinder block 6
And is arranged along the left side surface of the crankcase 7, and is formed to have a smaller size in the left-right direction than its front-rear size and up-down size.
And it is compactly stored in a narrow space between the crankcase 7 and the inner surface of the engine cover 4. In addition, the cartridge type oil filter 97 provided on the front surface of the crankcase 7 is disposed axially below the generator shaft 62 with respect to the crankshaft 15, and is also arranged right and left across the crankshaft 15. Thus, effective use of the front space of the engine room 36 is achieved.

Although the embodiments of the present invention have been described in detail, various design changes can be made in the present invention without departing from the gist thereof.

For example, in the embodiment, the tension pulley 57 is disposed on the right side of the cylinder axis L, and the engine hanger 66 is disposed on the left side. However, the positional relationship between them may be reversed. In the embodiment, a tension pulley 49 for applying tension to the endless belt 46 for driving the cam shaft 39 is disposed on the lower side, and a tension pulley 57 for applying tension to the endless belt 54 for driving both the secondary balancer shafts 37 and 38 is disposed on the upper side. The endless belts 46, 54 and the tension pulleys 49, 57 may be arranged upside down.

[0037]

As described above, according to the first aspect of the present invention, a pair of balancer shafts are supported on the left and right sides of the cylinder block sandwiching the cylinder axis, and are disposed along the upper surface of the cylinder block. A tension pulley for applying tension to the endless transmission band is provided on one side of the cylinder axis, and an engine hanger for suspending the outboard motor together with the engine is provided outside the endless transmission band loop and on the other side of the cylinder axis. Since the balancer shaft, the endless transmission band, the tension pulley, and the engine hanger are rationally arranged on the upper surface of the cylinder block so as not to interfere with each other, the size of the cylinder block can be reduced.

According to the invention described in claim 2,
A tension pulley that applies tension to an endless transmission band that drives a camshaft by a crankshaft, and a tension pulley that applies tension to an endless transmission band that drives a balancer shaft,
Since at least a part of the cylinder block is arranged so as to overlap in the vertical direction, the space on the upper surface of the cylinder block can be effectively used, and the size of the cylinder block can be further reduced.

[Brief description of the drawings]

FIG. 1 is an overall side view of an outboard motor.

FIG. 2 is an enlarged sectional view taken along line 2-2 of FIG. 1;

FIG. 3 is a view in the direction of arrows in FIG. 2;

FIG. 4 is a view in the direction of arrows in FIG. 3;

FIG. 5 is a sectional view taken along line 5-5 of FIG. 2;

FIG. 6 is a sectional view taken along line 6-6 in FIG. 3;

FIG. 7 is an explanatory diagram of an operation.

[Explanation of symbols]

 6 Cylinder block 15 Crank shaft 37 Right secondary balancer shaft (balancer shaft) 38 Left secondary balancer shaft (balancer shaft) 39 Cam shaft 46 Endless belt (endless transmission band) 49 Tension pulley 54 Endless belt (endless transmission band) 57 Tension Pulley 66 Engine hanger E Engine L Cylinder axis O Outboard

Claims (2)

[Claims] 1. A crankshaft (1) disposed substantially vertically.
5) and the endless transmission band (5
4) driven by a pair of balancer shafts (37, 3).
8), an outboard motor equipped with an engine (E) comprising: a pair of balancer shafts (37, 38) supported on the left and right sides of a cylinder block (6) sandwiching a cylinder axis (L); A tension pulley (57) for applying tension to the endless transmission band (54) disposed along the upper surface of (6) is provided on one side of the cylinder axis (L), and the outboard motor ( An engine in an outboard motor, wherein an engine hanger (66) for suspending the O) is provided outside the loop of the endless transmission band (54) and on the other side of the cylinder axis (L). Hanger equipment. 2. A camshaft (3) by a crankshaft (15).
9) a tension pulley (49) for applying tension to an endless transmission band (46) for driving the balancer shaft (3);
The tension pulley (57) for applying tension to the endless drive belt (54) for driving the drive (7, 38) is arranged so that at least a part thereof overlaps in the vertical direction. Hanger device for outboard motors.