JPH11141356A - Throttle opening controller of outboard motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the lowering of the engine speed in the clutch-in operation of a shift device in a clutch mechanism with a simple structure. SOLUTION: In an outboard motor comprising a carburetor 15 where a throttle valve is open and close operated by the throttle switching devices 19-23 and a clutch mechanism to be clutched in by a shift device 25, the throttle valve is open operated interlocking with the shift device 25 when the clutch mechanism is clutched in through the shift device 25, whereby the trawling rotational frequency of an engine 5 is increased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a throttle opening control device for an outboard motor.

[0002]

2. Description of the Related Art In many cases, an outboard motor travels at a low speed with an engine rotating near an idling speed, and this traveling state is generally called trolling traveling.

In spite of the fact that the required amount of air is different between idling and trolling traveling, individual setting cannot be performed because the throttle opening of the carburetor is constant. As a result, when the engine is idling, that is, in a state where the clutch mechanism is in a neutral state and no load is applied to the engine, the engine speed is, for example, 9
When the rotation speed is 00 rpm, the engine speed during trolling traveling, that is, when the load is applied to the engine while the shift device of the clutch mechanism is in the clutch-in state, decreases to, for example, 700 rpm.

[0004] When the engine speed drops at the time of clutch-in, when the shift device is engaged in the forward or reverse clutch in order to shift from the idling state of the engine to trolling running, the engine may breathe or stall. Occurs.

[0005] On the other hand, if the carburetor setting in which the flow rate of the fuel is suppressed to comply with the exhaust gas regulation at the time of idling is performed, in addition to the above-mentioned problems, there is a problem that the engine speed during trolling becomes unstable.

Therefore, generally in a four-wheeled vehicle or the like, the air amount is adjusted as needed using an ISC valve or the like.

[0007]

However, in the case of a multi-cylinder engine, a large number of ISC valves are required, which increases costs. Also, fine adjustment of the air amount is not easy.

The present invention has been made in consideration of the above-described circumstances, and has a simple structure, in which a shift device of a clutch mechanism is provided with a throttle opening control device for an outboard motor in which a decrease in engine speed during clutch-in operation is prevented. The purpose is to provide.

Another object of the present invention is to provide a throttle opening control device for an outboard motor in which the amount of air can be easily adjusted.

[0010]

According to a first aspect of the present invention, there is provided a throttle opening control apparatus for an outboard motor, wherein the throttle valve is opened and closed by a throttle opening and closing device. A carburetor that is operated,
In an outboard motor having a clutch mechanism operated by a shift device and a clutch mechanism, by opening the throttle valve in conjunction with the shift device when the clutch mechanism is clutched in through the shift device. This is an increase in the trolling speed of the engine.

According to another aspect of the present invention, the throttle opening / closing device includes a throttle lever which is provided integrally with a valve shaft to which the throttle valve is fixed, and a throttle lever which is provided integrally with the throttle shaft. The shift device has a throttle control lever pivotally operated by a cable and a throttle rod connecting the levers, and the shift device is rotationally operated by a clutch lever operating the clutch mechanism via a clutch rod and a clutch cable. A clutch lever connected to the clutch control lever via a cam rod, and a cam lever provided adjacent to the throttle lever. Arm that rotates A bar, adjustment means the end portion of the arm lever and the throttle lever, for example, those opposing angle of the two levers are connected to the adjustable screw.

Further, in order to solve the above-mentioned problems,
As described in claim 3, an adjusting means, for example, a nut is provided at a connection portion on one side of the cam rod connecting the cam lever and the clutch control lever, and the distance between the cam lever and the clutch control lever can be adjusted. It is what it was.

[0013]

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

FIG. 1 is a right side view of an outboard motor to which the present invention is applied. As shown in FIG. 1, the outboard motor 1 includes an engine holder 2 and is mounted on a transom 4a of a hull 4 via a bracket 3 attached to the engine holder 2. An engine 5 is installed on the upper part of the engine holder 2, and the periphery thereof is covered with an engine cover 6. A crankshaft 7 is arranged in the engine 5 in a vertical direction.

On the other hand, a drive shaft housing 8 is installed below the engine holder 2. A drive shaft 9 connected to a lower end of the crankshaft 7 extends downward in the drive shaft housing 8, and a bevel gear 11 and a propeller shaft 1 in a gear case 10 provided in a lower portion of the drive shaft housing 8.
2 to drive the propeller 13.

Further, the outboard motor 1 is provided with a clutch mechanism 14 for intermittently turning the rotation force from the drive shaft 9 to the propeller shaft 12 by remote control, and switching the rotation direction of the propeller shaft 12 between forward and reverse.

FIG. 2 is an enlarged right side view of the front portion of the engine 5. As shown in FIG. 2, a carburetor 15 constituting an intake system is disposed in front of the engine 5. The outboard motor 1 in this embodiment includes two carburetors 15 in the vertical direction. FIG. 3 is a rear view of the carburetor 15, and FIG. 4 is an enlarged right side view of the carburetor 15.

As shown in FIG. 3, an intake passage 16 formed in a throttle body 15a of the carburetor 15 is provided with a throttle valve 17 for controlling a flow rate of intake air flowing through the inside thereof. The throttle valve 17 is fixed to a valve shaft 18. The rotation of the valve shaft 18 opens and closes the throttle valve 17 to adjust the amount of intake air, that is, the number of revolutions of the engine 5.

As shown in FIGS. 2 to 4, the valve shaft 18 is disposed so as to protrude to the side of the throttle body 15a, and a throttle lever 19 constituting a throttle opening / closing device is provided at one end thereof with the valve shaft 18. It is provided integrally with the rotation. As shown in FIG. 2, the throttle lever 19 of the lower carburetor 15 and the upper carburetor 1
5 is connected to the throttle lever 19 by a carburetor link 20, and both throttle valves 17 open and close in conjunction with each other.

On the other hand, for example, on the side of the engine 5, a throttle control lever 21 as another throttle opening / closing device is supported rotatably around a rotation shaft 22. One end of a throttle control lever 21 sandwiching the rotation shaft 22 is connected to, for example, a throttle lever 19 of a lower carburetor 15 via a throttle rod 23, and a throttle cable 24 is connected to the other end of the throttle control lever 21. This throttle cable 24
Are guided to the outside of the outboard motor 1.

When the throttle cable 24 is pulled, the throttle control lever 21 rotates, and the throttle lever 19 of the lower carburetor 15 rotates via the throttle rod 23. Further, the carburetor link 20 causes the throttle lever 19 of the upper carburetor 15 to rotate in conjunction therewith.

The clutch mechanism 14 is provided with a shift device 25. The shift device 25 is connected via a clutch lever rod 27 to a clutch control lever 26 provided coaxially with the rotation shaft 22 of the throttle control lever 21 and to one end of the clutch control lever 26 with the rotation shaft 22 interposed therebetween. And a clutch cable 29 connected to the other end of the clutch control lever 26 and led to the outside of the outboard motor 1, and a clutch rod 30 connecting the clutch lever 28 and the clutch mechanism 14. Is done.

When the clutch cable 29 is pulled, the clutch control lever 26 rotates about the rotation shaft 22 and rotates the clutch lever 28 via the clutch lever rod 27. When the clutch lever 28 rotates, the clutch rod 30 moves up and down, and the up and down movement causes the clutch mechanism 14 to interrupt the turning force from the drive shaft 9 to the propeller shaft 12 and to switch the rotation direction of the propeller shaft 12 between forward and reverse. .

FIG. 5 is a left side view of the remote control lever 31 to which the throttle cable 24 and the clutch cable 29 are connected. As shown in FIG. 5, a remote control lever 31 (hereinafter, abbreviated as a remote control lever) is set so that the clutch mechanism 14 is in a neutral state (N) in an upright state, for example. Engages (connects) the clutch mechanism 14 to the forward (F, forward) via the shift device 25 at the time of pushing 30 ° to the left. Further, when the remote control lever 31 is pulled backward by 30 ° to the right side in FIG. 5, the clutch mechanism 14 is clutched in reverse (R, reverse).

On the other hand, until the remote control lever 31 is in the range of 30 ° before and after the neutral state, that is, until the clutch mechanism 14 is engaged, the throttle cable 2
4 is not operated and the throttle valve 1 of the carburetor 15
7 maintains the fully closed state. If the remote control lever 31 exceeds the range of 30 degrees before and after this, the throttle cable 2
4. Open the throttle valve 17 of the carburetor 15 via the throttle control lever 21, the throttle rod 23 and the throttle lever 19.

The carburetor 15 according to the present invention rotatably supports a cam lever 32 via a bracket (not shown). The cam lever 32 is shown in FIGS.
Is connected to the clutch control lever 26 via the cam rod 33 as shown in FIG. That is, when the remote control lever 31 is operated to operate the shift device 25 and the clutch mechanism 14 is clutched, the cam lever 32 rotates in conjunction with the clutch control lever 26. Further, on one side of the cam rod 33, for example, at a connection portion to the clutch control lever 26, an adjustment nut 34 which is a means for adjusting the distance between the cam lever 32 and the clutch control lever 26 is provided, and the position of the cam lever 32 is adjusted. Make it possible.

On the other hand, an arm lever 35 having an arm portion 35a is rotatably supported on the valve shaft 18 adjacent to the throttle lever 19. The opposite ends of the cam lever 32 are bent so as to overlap in the vertical direction with respect to the valve shaft 18 of the arm lever 35 and the throttle lever 19 which are spaced apart in the axial direction, and these ends are adjusted by adjusting means with a spring 36 interposed therebetween. It is connected by a certain adjustment screw 37. That is, when one of the levers is rotated, the other lever is also configured to be interlocked. The angle between the levers 19 and 35 can be adjusted by tightening or loosening the adjustment screw 37.

A roller 38 is provided at the end of the arm portion 35a on the cam lever 32 side, and the roller 38 comes into contact with the cam outer peripheral portion 32a of the cam lever 32. When the cam lever 32 rotates by the clutch-in operation, the roller 38 moves along the shape of the cam, and rotates the arm lever 35. When the arm lever 35 rotates, the throttle lever 19 interlocks, and the throttle valve 17 is opened and closed.

The cam shape of the cam lever 32 is set to an angle enough for the throttle valve 17 to increase the engine speed by, for example, 100 to 200 rpm when the remote control lever 31 is operated and the clutch mechanism 14 is engaged.
For example, it is formed in a shape rotated about 3 °.

Next, the operation of the present embodiment will be described.

The outboard motor 1 often runs at a low speed with the rotation of the engine 5 close to the idling speed, and this running state is generally referred to as trolling running.

By the way, when the clutch mechanism 14 is operated to perform the trolling operation during idling, that is, when the load is not applied to the engine 5 while the clutch mechanism 14 is in the neutral state, the load is applied to the engine 5 and the engine speed is reduced. Is, for example, 100 to 200
rpm.

However, the carburetor 1 according to the present invention
5 is provided with a throttle valve 17 that opens in conjunction with the clutch mechanism 14. That is, the remote control lever 3
When the engine 1 is pushed forward, for example, the clutch mechanism 14 is clutched in via the shift device 25, and at the same time, the throttle valve 17 is opened by the cam lever 32 and the arm lever 35, and the engine speed is reduced to, for example, 10
Increase by 0 to 200 rpm.

Since the increase in the engine speed and the decrease in the engine speed during the clutch-in operation cancel each other, the clutch mechanism 14 is moved forward or reverse to shift from the idling state of the engine 5 to the trolling running. Engine 5 even if clutch-in operation
There is no breathing or stalling, and a smooth transition is possible. As a result, idling is stabilized and acceleration can be smoothly performed thereafter.

Further, the ends of the arm lever 35 and the throttle lever 19 are bent so as to overlap in the vertical direction,
These ends are connected with an adjusting screw 37, and both levers 19,
By making the angles of the opposed members 35 adjustable, fine adjustment of the engine speed during idling, clutch-in, and trolling can be easily performed.

An adjusting nut for adjusting the distance between the cam lever 32 and the clutch control lever 26 is provided at one connecting portion on one side of the cam rod 33 connecting the cam lever 32 and the clutch control lever 26. The mounting error can be absorbed and the engine speed at the time of clutch-in operation increases.

[0037]

As described above, according to the throttle opening control device for an outboard motor according to the present invention, the carburetor whose throttle valve is opened / closed by the throttle opening / closing device and the clutch-in operation by the shift device. In an outboard motor having a clutch mechanism, the trolling speed of the engine is increased by opening the throttle valve in conjunction with the shift device when the clutch mechanism is clutched in through the shift device. Therefore, even if the clutch mechanism is operated to perform the clutch-in operation when the engine is idling, the engine does not breathe or stall.

The throttle opening / closing device includes a throttle lever provided integrally with a valve shaft to which the throttle valve is fixed, a throttle control lever pivotally operated by a throttle cable, and a throttle connecting the levers. In addition to having a rod, the shift device has a clutch lever that operates the clutch mechanism via a clutch rod, a clutch control lever that is rotated by a clutch cable, and a clutch lever rod 27 that connects both levers. On the other hand, there are provided a cam lever connected to a clutch control lever via a cam rod, and an arm lever provided adjacent to the throttle lever and rotated with the rotation of the cam lever. Since connecting the ends of the bar adjustment screw opposing angle of the two levers and adjustable, idling, thereby facilitating fine adjustment of the engine speed during the time the clutch in and trolling.

Further, an adjusting nut 34 is provided at a connection portion on one side of the cam rod for connecting the cam lever and the clutch control lever so that the distance between the cam lever and the clutch control lever can be adjusted. The engine speed at the time increases.

[Brief description of the drawings]

FIG. 1 is a right side view of an outboard motor showing an embodiment of a throttle opening control device for an outboard motor according to the present invention.

FIG. 2 is an enlarged right side view of the front part of the engine.

FIG. 3 is a rear view of the carburetor.

FIG. 4 is an enlarged right side view of the carburetor.

FIG. 5 is a left side view of the remote control lever.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 outboard motor 5 engine 14 clutch mechanism 15 carburetor 17 throttle valve 18 valve shaft 19 throttle lever (throttle opening / closing device) 21 throttle control lever (throttle opening / closing device) 23 throttle rod (throttle opening / closing device) 24 throttle cable (throttle opening / closing device) Reference Signs List 25 shift device 26 clutch control lever (shift device) 27 clutch lever rod (shift device) 28 clutch lever (shift device) 29 clutch cable (shift device) 30 clutch rod (shift device) 33 cam rod 34 adjustment nut (adjustment means) 35 Arm lever 37 Adjusting screw (adjusting means)

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI F02D 29/00 F02D 29/00 A

Claims (3)

[Claims] An outboard motor including a carburetor in which a throttle valve is opened and closed by a throttle opening and closing device and a clutch mechanism in which a shift device performs a clutch-in operation, wherein the clutch mechanism is connected to the shift device 25.
A throttle opening control device for an outboard motor, wherein the trolling speed of the engine 5 is increased by opening the throttle valve 17 in conjunction with the shift device 25 when the clutch is engaged through the engine. . 2. The throttle opening / closing devices 19 to 23 include a valve shaft 1 to which the throttle valve 17 is fixed.
8 has a throttle lever 19 provided integrally with the rotation, a throttle control lever 21 which is rotated by a throttle cable 24, and a throttle rod 23 connecting the levers 19, 21. A clutch lever 28 that operates the clutch mechanism via a clutch rod 30; a clutch control lever 26 that is rotated by a clutch cable 29; and a clutch lever rod 27 that connects the two levers 26, 28; 33, a cam lever 32 connected to the clutch control lever 26 via a lever 33, and an arm lever 35 provided adjacent to the throttle lever 19 and rotating with the rotation of the cam lever 32. And the throttle Adjustable and the throttle opening control device according to claim 1, wherein the outboard motor opposing angle end adjusting means 37 the levers are connected by 19, 35 of over 19. 3. An adjusting means (34) is provided at a connection portion on one side of a cam rod (33) for connecting the cam lever (32) and the clutch control lever (26) so that the distance between the cam lever (32) and the clutch control lever (26) can be adjusted. 3. The throttle opening control device for an outboard motor according to claim 2, wherein: