JP3347893B2 - Outboard motor shift control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shift operation device for an outboard motor in which power transmission from an engine to a propeller is controlled by a rotary shift rod.

[0002]

2. Description of the Related Art There are two types of shift rods of an outboard motor shift operation device (forward / reverse switching device), a vertical type and a rotary type. The interference between the upper end of a shift rod extending into an engine room and other members is provided. In consideration of this, a rotary type in which the shift rod does not move up and down is advantageous.

[0003] As such a rotary shift operation device, one described in Japanese Utility Model Publication No. 44-13325 is known.

[0004]

The conventional shift operating device supports a shift control link system for operating a shift rod on an upper surface of a bottom plate of an upper case for housing an engine. Also supports a throttle operation link system that regulates the throttle opening in conjunction with the shift operation link system, so the position of the engine body supported above those link systems will inevitably increase. However, there is a problem that the position of the center of gravity of the entire outboard motor becomes high.

[0005] The present invention has been made in view of the above circumstances, and has as its object to prevent the interference with the engine body by rationally laying out a rotary shift operation device.

[0006]

In order to achieve the above object, the invention described in claim 1 comprises a piston and a clutch.
Cylinder block and crankcase for accommodating shaft
And the flywheel provided below the crankshaft.
The flywheel storage room to accommodate
And a mount case formed in cooperation with the crankcase
Equipped with an engine having an engine main case consisting of
The direction of rotation of the propeller rotating by the output of the engine
And a shift gear mechanism for switching between
A shift rod that rises up from above, and the shift rod
Shift operation of an outboard motor having a link mechanism for rotating the motor
An apparatus, wherein the link mechanism is provided to the engine.
So that it extends vertically on the side of the flywheel
Shift output supported and rotated by shift operation lever
Shaft and a drive gear provided at a lower end of the shift output shaft
And the drive gear provided at an upper end of the shift rod.
And a driven gear that meshes with the drive gear and the driven gear.
Inside the flywheel storage chamber and
Meshes below the wheel, and the shift output shaft
It is characterized in that it extends upward from the flywheel storage chamber .

[0007]

According to the invention described in claim 2 ,
In addition to the configuration of claim 1, wherein the link mechanism includes a shift output arm provided at the upper end of the shift output shaft extending outward from the end <br/> Gin main case, a side wall of the engine main case a shift input arm coupled to the shift operating lever is pivoted, and further comprising a shift link connecting the shift input arm and the shift output arm.

[0009]

According to the first aspect of the present invention, the operation of the shift operation lever is transmitted to the shift gear mechanism via the shift output shaft of the link mechanism, the drive gear, the driven gear, and the shift rod,
Power transmission from the drive shaft to the propeller is controlled. At this time, since the drive gear and the driven gear are housed inside the engine main case, the mounting position of the engine does not increase. The drive gear and the driven gear are
Flywheel that stores the flywheel provided at the lower end
Because it is stored in the storage room, it is for drive gear and driven gear
Not only does it require special space, but also
Lowering the mounting position lowers the center of gravity of the outboard motor.
You.

[0010]

According to the second aspect , the operation of the shift operation lever is transmitted to the shift gear mechanism via the shift input arm, the shift link and the shift output arm, the shift output shaft, the drive gear, the driven gear, and the shift rod. . At this time, the shift input arm, the shift link, and the shift output arm are arranged on the side of the engine main case, so that the mounting position of the engine does not increase.

[0012]

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

1 to 14 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 of a main part of FIG. 1, and FIG. FIG. 4 is a left side view of the engine, FIG. 5 is a view taken in the direction of arrows 5-5 in FIG. 4, and FIG.
7 is an enlarged cross-sectional view of FIG. 8, FIG. 7 is a cross-sectional view taken along line 7-7 of FIG.
9 is an enlarged view in the direction of the arrow 8 in FIG. 4, FIG. 9 is a view in the direction of the arrow 9 in FIG. 8, FIG. 10 is a sectional view taken along line 10-10 of FIG.
FIG. 12 is an explanatory diagram of an operation at the time of forward movement corresponding to FIG.
FIG. 13 is a view for explaining the operation at the time of reverse movement corresponding to FIG. 8, and FIG. 14 is a view in the direction of arrow 14 in FIG.

As shown in FIGS. 1 and 2, the outboard motor O is
A mount case 2 is provided on an upper portion of the extension case 1, and an in-line four-cylinder four-cycle engine E is supported on an upper surface of the mount case 2. 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 upper edge 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, an upper belt cover 11, and an oil pan 40. The cylinder block 6 and the crankcase 7 are mounted on the mount case. 2 is supported on the upper surface.
Oil discharge passage ₆₁ formed in the cylinder block 6 communicates with the interior of the oil pan 40. The cylinder block 6, the crankcase 7, and the mount case 2 constitute an engine main case of the present invention, and the engine main case includes a cylinder head 8, a head cover 9, and a lower belt cover 1.
0, the upper belt cover 11 and the oil pan 40 are attached.

A piston 13 is slidably fitted to each of four cylinders 12a ₁ , 12a ₂ , 12b ₁ , 12b ₂ formed on the cylinder block 6, and each of the pistons 13 is connected to a connecting rod 14. Through a crankshaft 15 arranged vertically. The upper two cylinders 12a ₁ and 12a ₂ are the first cylinder group 12a
, And the lower two cylinders 12b ₁ and 12b ₂ constitute a second cylinder group 12b.

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 shift gear mechanism 19 provided inside the. A lower end of a shift rod 22 is connected to a front portion of the shift gear mechanism 19 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.

One camshaft 29 parallel to the crankshaft 15
Are rotatably supported by the cylinder head 8, and a timing belt 33 is wound around a crank pulley 30 provided at an upper end of the crankshaft 15 and a cam pulley 31 provided at an upper end of the camshaft 29. A generator 36 including a stator 34 and a rotor 35 is provided above the crank pulley 30, and a starting pulley 37 for manually starting the engine E is provided above the generator 36. The crank pulley 30, the cam pulley 31, the timing belt 33, the generator 36 and the starting pulley 37 are housed inside the lower belt cover 10 and the upper belt cover 11.

Next, the structure of the intake system of the engine E will be described with reference to FIG.

On the right side of the cylinder head 8 of the engine E housed in the engine room 51 defined inside the engine cover 4, four cylinders 12a ₁ , 12a ₂ ,
An intake manifold 53 integrally having four intake passages 52... Respectively corresponding to 12b ₁ and 12b ₂ is connected. Each of the intake passages 52 is curved forward, and four carburetors 54a ₁ , 54a ₂ , 54b ₁ , 54 are provided at their front ends.
b ₂ are respectively connected.

Each carburetor 54a ₁ , 54a ₂ , 54b
_A throttle valve (not shown) and a choke valve (not shown) are housed inside the _first and 54b ₂ , and a throttle valve lever 56 connected to a valve shaft 55 of each throttle valve.
Are driven in conjunction with a common link 57,
The choke valve levers 59... Connected to the valve shafts 58.

The upstream ends of the four carburetors 54a ₁ , 54a ₂ , 54b ₁ , 54b ₂ are connected to a first intake silence chamber 61 arranged along the right side of the crankcase 7 of the engine E. A second intake silence chamber 62 connected to the upstream side of the first intake silence chamber 61 is detachably connected to a space along the side of the crankcase 7 opposite the cylinder head 8, that is, a front space of the engine room 51. Second intake silencing chamber 62 and the first portion 62 ₂ extending upwardly from the intake port 62 ₁ which opens downward, 90 ° in the horizontal direction from the first portion 62 ₂
And a second portion 62 ₃ which is connected to the upper left side of the first intake silencing chamber 61 curved. The head cover 9 and the first intake silencing chamber 61 are connected by a breather pipe 63.

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

A first fuel pump 64a and a second fuel pump 64b are provided on the right side of the cylinder head 8 of the engine E, and a fuel tank (not shown)
5. The two fuel pumps 64 via the fuel supply pipe 66, the joint 67, and the fuel supply pipes 68a, 68b.
a, 64b are connected to the suction ports.

The discharge port of the upper first fuel pump 64a is connected to the two cylinders 12 of the upper first cylinder group 12a.
The carburetors 54a ₁ , 54a ₂ of the a ₁ , 12a ₂ are connected via fuel supply pipes 69a ₁ , 69a _2, and the discharge port of the lower second fuel pump 64b is connected to the lower second cylinder group 12b. Two cylinders 12b ₁ , 1
Carburetor carburetor 54b ₁ of 2b _2, 54b ₂ are connected via a fuel supply pipe 69b _1, 69b ₂ on.

Next, the structure of the link mechanism Ls for shift operation will be described with reference to FIGS.

As is apparent from FIGS. 4 and 8 to 10, the mounting bracket 71 is fixed to the left side surface of the crankcase 7 of the engine E by two bolts 70, 70. A shift input shaft 72 extending in the vertical direction is rotatably supported by the mounting bracket 71, and a shift input arm 7 is provided at a lower end and an upper end of the shift input shaft 72, respectively.
The third and first regulating arms 74 are fixed. The tip of the shift input arm 73 is connected to a shift operation lever 98 provided at a position distant from the outboard motor O by a Bowden wire 75 penetrating the wall of the under case 3.

A shift output shaft 76 extending vertically is rotatably supported at the front of the crankcase 7, and is fixed to the upper end of the shift output shaft 76 extending upward from the upper surface of the crankcase 7. A tip of the output arm 77 and an intermediate portion of the shift input arm 73 are connected by a shift link 78.

The shift output arm 77 has three recesses 7
And _{7 N, 77 F, 77 R} , 1 and one dog 77 is formed. A leaf spring 79 is provided on the side wall of the crankcase 7.
One end of the are bolted 80, roller 81 provided at the other end of the leaf spring 79 is selectively engaged with the three recesses _{77 N, 77 F, 77 R} . In the neutral position shown in FIG. 8, with the roller 81 in the recess 77 _N positions the shift output shaft 76 engages, dog 77 ₁ detects the neutral position kicking limit switch 82. In the forward position shown in FIG. 11 and the reverse position shown in FIG. 13, the roller 81 engages with the concave portions 77 _F and 77 _R to position the shift output shaft 76.

As apparent from FIGS. 2 and 5, the drive sector gear 83 provided at the lower end of the shift output shaft 76 and the driven sector gear 84 provided at the upper end of the shift rod 22 constitute a part of the engine main case. It meshes inside the flywheel storage chamber 38.

As is apparent from FIGS. 6 and 7, a first driven bevel gear 85 and a second driven bevel gear 86 are supported on the outer periphery of the propeller shaft 21 so as to be relatively rotatable, and these first and second driven bevel gears are provided. 85 and 86 are drive shafts 17
And a drive bevel gear 97 provided at the lower end of the gear. First,
A shift member 87 that is spline fitted to the propeller shaft 21 is slidably supported between the second driven bevel gears 85 and 86. Axial ends respectively engaging the Tomeha 87 of the shift member 87 ₁ ..., along with 87 ₂ ... are formed, these locking teeth 87 ₁ ..., the locking teeth 85 that face engageable 87 ₂ ...
₁ ..., 86 ₁ are respectively provided to the first driven bevel gear 85 and the second driven bevel gear 86.

The sliding shaft 88 into the shaft hole 18 ₁ of the shaft hole 21 ₁ and the gear case 18 of the propeller shaft 21 is slidably supported, a pair of flanges 88 provided on the sliding shaft 88
Eccentric pin 22 ₁ provided at the lower end of the shift rod 22 is engaged between _1, 88 _1. Both end portions of the pin 89 provided on the sliding shaft 88 is engaged with the shift member 87 through the elongated hole 21 _2, 21 ₂ of the propeller shaft 21.

Next, the structure of the throttle operation link mechanism Lt will be described with reference to FIG. 4 and FIGS.

A throttle arm 91 is pivotally supported by the mounting bracket 71 via a throttle shaft 90 extending in the left-right direction. The tip of the throttle arm 91 is separated from the outboard motor O via a Bowden wire 92. It is connected to a throttle operation lever 99 provided. The throttle arm 91 is integrally formed with a drive pulley 93 and a second control arm 94 that can contact the first control arm 74. A Bowden wire 95 wound around the drive pulley 93 is provided in front of the engine E. The portion is detoured from the left side to the right side, and is wound around a driven pulley 96 that drives the throttle valve lever 56 (see FIG. 3).

The throttle arm 91 is located above the shift input arm 73 and the second regulating arm 94
Are located below the first regulating arm 74, and therefore, the shift input arm 73 associated with the rotation of the shift input shaft 72.
The throttle arm 91 and the second regulating arm 94 are accommodated in the working space of the first regulating arm 74.

Next, the operation of the embodiment of the present invention having the above-described configuration will be described.

When the shift position is in the neutral position, as shown in FIG.
A roller 81 provided at the end of the shift output arm 9 is engaged with the recess 77 _N of the shift output arm 77. At this time, the locking teeth 87 ₁ of the shift member 87 of the shift gear mechanism 19 in FIG.
87 ₂ ... I am not engaged in either the locking teeth 86 ₂ ... of the locking teeth 85 ₁ ... and the second driven bevel gear 86 of the first driven bevel gear 85. Therefore, the first and second driven bevel gears 85 and 86 meshing with the drive bevel gear 97 provided at the lower end of the drive shaft 17 run idle, and power transmission to the propeller shaft 21 is not performed.

When the shift input shaft 72 and the shift input arm 73 are rotated clockwise from the neutral state in FIG. 8 to the forward state shown in FIG. 11 by the Bowden wire 75, the shift output shaft 76 and the shift The output arm 77 rotates clockwise, and further the driven sector gear 84 and the shift rod 22 rotate counterclockwise via the drive sector gear 83. As a result, the shift member 87 is moved to the right together with the slide shaft 88 by the eccentric pin 22 ₁ of the shift rod 22 in FIG. 7, the shift member 87
The locking teeth 8 of the locking teeth 87 ₁ ... is first driven bevel gear 85
5 ₁ ... engage. Thereby, the rotation of the drive bevel gear 97 is transmitted to the first driven bevel gear 85 and the shift member 87, and the propeller shaft 21 rotates in the forward direction.

On the other hand, when the shift input shaft 72 and the shift input arm 73 are rotated counterclockwise from the neutral state shown in FIG. 8 to the reverse state shown in FIG. 76 and the shift output arm 77 rotate counterclockwise,
Further, the driven sector gear 84 and the shift rod 22 rotate clockwise via the driving sector gear 83. as a result,
Shift member 87 is moved to the left together with the slide shaft 88 by the eccentric pin 22 ₁ of the shift rod 22 in FIG. 7, engaging the locking teeth 87 ₂ ... shift member 87 is in the locking teeth 86 ₁ ... of the second driven bevel gear 86 Combine. Thus, the rotation of the drive bevel gear 97 is controlled by the second driven bevel gear 86 and the shift member 8.
7 and the propeller shaft 21 rotates in the reverse direction.

Shift input shaft 72 and shift input arm 7
3 is in the neutral state of FIG.
As shown in FIG. 0, the second restricting arm 94 abuts on the first restricting arm 74 which rotates integrally with the shift input arm 73, so that the rotatable angle of the throttle arm 91 from the fully closed position becomes the minimum α. Be regulated. As a result, the rotation angle of the driven pulley 96 (see FIG. 3) connected to the driving pulley 93 via the Bowden wire 95 is also restricted to a minimum, and the blowing of the engine E in the neutral position is restricted.

Shift input shaft 72 and shift input arm 7
11 is in the forward state of FIG. 11, the second regulating arm 94 can freely rotate without contacting the first regulating arm 74 as shown in FIG. It can rotate over the maximum angle β to the fully open position.

Shift input shaft 72 and shift input arm 7
When the throttle arm 3 is in the reverse state in FIG. 13, the second arm 94 contacts the first arm 74 as shown in FIG. Γ intermediate between the rotatable angle α in the neutral state and the rotatable angle β in the forward state
Is regulated. Thereby, high-speed operation of the engine E in the reverse position is regulated.

Since the drive sector gear 83 and the driven sector gear 84 of the shift operation link mechanism Ls are housed in the flywheel storage chamber 38 which is a part of the engine main case, the drive sector gear 83 and the driven sector gear 83 are driven. 84 is arranged outside the engine main case, and the engine E is
Can be lowered to lower the center of gravity of the outboard motor O. The shift input shaft 72 and the shift input arm 7
3. By disposing the shift link 78 and the shift output arm 77 on the side of the engine E, the mounting position of the engine E is not raised by those members.

A shift operation link mechanism Ls and a throttle operation link mechanism Lt are provided on the side of the engine E, and the shift input shaft 72 of the shift operation link mechanism Ls is arranged in the up-down direction and the throttle operation link mechanism is provided. Lt throttle shaft 90 is disposed in a horizontal direction, and a throttle shaft 90 is provided between a shift input arm 73 and a first regulating arm 74 provided at a lower end and an upper end of a shift input shaft 72.
Arm 91 and second regulating arm 94 provided at
Are arranged in the working space of the shift input arm 73 and the first regulating arm 74.
Both link mechanisms Ls and Lt can be made compact by containing the regulating arm 94.

A shift gear provided below the outboard motor O
The shift input arm 73 connected to the mechanism 19 is
And a carburetor 5 provided above the outboard motor O.
4a ₁, 54a_Two, 54b₁, 54b_TwoSlots connected to
Torsion arm 91 higher than the shift input arm 73
Position, the shift operation link mechanism Ls and
Unnecessary interference of throttle link mechanism Lt
And the two link mechanisms Ls,
Lt can be made compact.

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.

[0048]

As described above, according to the first aspect of the present invention, the link mechanism connected to the upper part of the shift rod to convert the operation of the shift operation lever into the rotational movement of the shift rod is provided. A shift output shaft that is vertically supported by the engine main case and is connected to the shift operation lever and rotates; a drive gear provided at the lower end of the shift output shaft; and a driven gear provided at the upper end of the shift rod. Since the drive gear and the driven gear mesh with each other inside the engine main case, there is no need to secure a space for mounting the drive gear and the driven gear under the engine main case, and the mounting position of the engine can be lowered. it can.
The drive gear and the driven gear are provided at the lower end of the crankshaft.
Stored in flywheel storage room to store flywheel
Special specifications for drive and driven gears
Not only do not need
The center of gravity of the outboard motor can be lowered.

[0049]

According to the second aspect of the present invention,
A shift output arm provided at the upper end of a shift output shaft extending from the engine main case to the outside, a shift input arm pivotally supported by a side wall of the engine main case and connected to a shift operation lever, Since the shift input arm, the shift link and the shift output arm are further provided with a shift link connecting the arm and the shift output arm, the shift input arm, the shift link and the shift output arm can be arranged on the side of the engine main case to prevent the engine mounting position from rising. it can.

[Brief description of the drawings]

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

FIG. 2 is an enlarged sectional view of a main part of FIG. 1;

FIG. 3 is a right side view of the engine.

FIG. 4 is a left side view of the engine.

FIG. 5 is a view taken along line 5-5 in FIG. 4;

FIG. 6 is an enlarged sectional view of a main part of FIG. 1;

FIG. 7 is a sectional view taken along line 7-7 of FIG. 6;

FIG. 8 is an enlarged view in the direction of an arrow in FIG. 4;

9 is a view in the direction of arrow 9 in FIG. 8;

FIG. 10 is a sectional view taken along line 10-10 of FIG. 8;

FIG. 11 is an explanatory view of an operation at the time of forward movement corresponding to FIG. 8;

FIG. 12 is a view in the direction of arrow 12 in FIG. 11;

FIG. 13 is an explanatory diagram of the operation at the time of reverse movement corresponding to FIG. 8;

FIG. 14 is a view taken in the direction of arrow 14 in FIG. 13;

[Explanation of symbols]

2 mounting cases 6 cylinder block 7 crankcase 13 piston 15 crankshaft 16 flywheel 1 9 shift gear mechanism 20 propeller 22 shift rod 38 flywheel housing chamber 73 shifts the input arm 76 shifts the output shaft 77 shifts the output arm 78 shift link 83 Drive sector gear (drive gear) 84 Driven sector gear (driven gear) 98 Shift operating lever E Engine Ls Shift operating link mechanism (link mechanism)

Claims (2)

(57) [Claims] 1. A piston (13) and a crankshaft (1).
Cylinder block (6) for accommodating 5) and crankcase
And a flywheel provided below the crankshaft (15).
In front of flywheel storage room (38) containing (16)
The cylinder block (6) and the crankcase (7)
An engine (E) having an engine main case composed of a mount case (2) formed in cooperation therewith is mounted.
It mounting the propeller to rotate by the output of the engine (E) (2
Shift gear mechanism for switching the rotation direction of (0) (19)
A shift upright from the shift gear mechanism (19).
And a link mechanism (L) for rotating the shift rod (22).
s) and, a shift operating device for an outboard motor having the linkage mechanism (Ls), the said engine (E)
Extends vertically on the side of the flywheel (16)
Supported by the shift operation lever (98).
A moving shift output shaft (76), and a driving gear provided at a lower end of the shift output shaft (76).
(83) and the drive rod provided at the upper end of the shift rod (22).
And a driven gear (84) meshing with the gear (83), wherein the drive gear (83) and the driven gear (84) are
Inside the wheel storage room (38) and the flywheel
Meshes below the eel (16) and further shift output
A shaft (76) is above the flywheel storage chamber (38).
A shift operating device for an outboard motor characterized by extending to the side . Wherein said link mechanism (Ls) is, the shift output shaft extending in the engine <br/> down main cases or et outside (7
A shift output arm provided at the upper end of 6) (77), a shift input arm said <br/> is pivotally supported on the side wall of the engine main cases coupled to the shift operating lever (98) (73)
When the shift further characterized in that an input arm (73) and the shift output shift link connecting the arm (77) (78), according to claim 1 shift operating device of the outboard motor in accordance.