JP2717296B2 - Control device for two-stroke engine - Google Patents

Abstract

PURPOSE:To allow a lubricating oil amount to be always properly held by providing a joint box halfway a cable connecting a throttle grip to a throttle valve. CONSTITUTION:A joint box 14 is provided halfway a control cable 13 connecting a throttle grip of a handle to throttle valve of a carburetor. A supporting shaft 16 mounted on a throttle pulley 15 is journalled to the joint box 14, and the control cable 13 is connected to the throttle pulley 15. A protrusion 19 of the throttle pulley 15 is abutted against one side of an oil pump pulley 17 journalled to the supporting shaft 16. A control cable 21 connected to a cam lever of an oil pump is connected to the oil pump pulley 17. It is thus possible to control the delivery amount of oil pump by both the opening of the throttle grip an the engine speed, and further to always hold the amount of lubricating oil properly.

Description

Description: TECHNICAL FIELD The present invention relates to a control device for a two-stroke engine used as power for a motorcycle or the like.

[Conventional technology]

The two-stroke engine has a plunger type oil pump that reciprocates while rotating in conjunction with the engine,
A small amount of lubricating oil is sent out to the engine crankcase and mixed with the intake air to lubricate each part of the engine. The stroke of the plunger is made variable with the cam lever, and the cam lever is linked to the throttle valve of the engine. The stroke is reduced when the output is low and the output is low, and the stroke is high when the output is high and the output is high. And lubricating oil is increased so that lubrication is sufficient. For example, see Japanese Utility Model Laid-Open No. 47-15080.

Also, recent two-stroke engines are equipped with an advanced ignition timing and an exhaust valve for higher performance, and are controlled in relation to a throttle grip.

[Problems to be solved by the invention]

A two-stroke engine used as power for a vehicle, such as a motorcycle, closes the throttle valve when running down a long downhill to reduce the engine output, but since the rotation is high according to the vehicle speed, the conventional lubricating oil is used. The increase / decrease technique has a problem that the lubricating oil amount is insufficient. Further, in the above-mentioned conventional control of the advance of the ignition timing and the control of the exhaust valve in relation to the throttle grip, there is a problem that the structure becomes complicated if the control devices are mounted at different positions. .

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above problems, and has as its object to provide a two-stroke engine control device capable of always maintaining a proper supply amount of lubricating oil and performing accurate control.

[Means for solving the problem]

In order to achieve the above object, a control device for a two-stroke engine according to the present invention has an operation cable for connecting a support shaft attached to a throttle pulley to a joint box and connecting the throttle pulley to a throttle grip and a throttle valve of a carburetor. Connect the oil pump pulley and the actuator pulley to the shaft next to the throttle pulley on the support shaft, and apply the protrusions of the throttle pulley and the actuator pulley to one side of the oil pump pulley. Connect the operation cable connected, connect the operation cable connected to the actuator of the exhaust valve to the actuator pulley, and connect the pinion of the operation shaft of the throttle positioner attached to one side of the joint box to the throttle pulley. Meshes was on the outer periphery of the gear in that so as to interlock with.

[Action]

When the throttle grip is rotated, the throttle pulley is rotated, the throttle valve is opened, the amount of intake air is increased, and the engine speed is increased. On the other hand, when the throttle pulley rotates, the protrusion rotates the oil pump pulley, and increases the discharge amount of lubricating oil from the oil pump. The actuator opens the exhaust valve when the rotation is high, and rotates the actuator pulley to rotate the oil pump pulley with the protrusion. For this reason, even when the opening degree of the throttle grip is low and decelerating, if the engine speed is high, the amount of lubricating oil increases. The throttle pulley rotates the pinion with gears as it rotates, and the ignition timing is advanced with the throttle positioner according to the opening of the throttle grip,
The actuator is also operated to control the exhaust valve at high speed. The throttle pulley uses a gear and a pinion to expand the moving range (dotted line) of the operation shaft of the throttle positioner with respect to the rotation (solid line) of the throttle pulley as shown in FIG. .

〔Example〕

 An embodiment of the present invention will be described with reference to the drawings.

First, an oil pump for lubricating oil will be described with reference to FIG. A plunger 3 repelled by a spring 2 is slidably inserted into the oil pump 1.
The plunger 3 rotates while meshing with a worm 4 linked to the crankshaft of the engine. A cam 6 is provided at one end of the plunger 3 against the pin 5. The plunger 3 is repelled by the spring 2 so that the cam 6 contacts the pin 5 and reciprocates along the surface of the cam 6. Move. The oil pump 1 is provided with a suction port 7 and a discharge port 8, and a notch 9 of the plunger 3 opens and closes the suction port 7 and the discharge port 8 alternately.
The lubricating oil is sent out to the discharge port 8, and the lubricating oil is discharged little by little into a crank chamber or the like. A cam lever 10 is provided at the tip of the plunger 3. The cam lever 10 receives the tip of the plunger 3 depending on its position, limits the stroke, and varies the discharge amount. Thus, the present invention
As shown in FIGS. 3 to 3, a joint box 14 is provided in the middle of an operation cable 13 connecting a throttle grip 11 of a steering wheel and a throttle valve 12 of a carburetor. On the joint box 14, a support shaft 16 which is connected to a throttle pulley 15 by a spline or the like so as to rotate integrally therewith is mounted. The end of the operation cable 13 connected to the throttle grip 11 and the end of the operation cable 13 connected to the throttle valve 12 are connected to the throttle pulley 15. Next to the throttle pulley 15, an oil pump pulley 17 and an actuator pulley 18 are rotatably mounted on a support shaft 16.
One end of the throttle pulley 15 has a protrusion
19 is provided so that it can be turned against one end of the oil pump pulley 17. In addition, the actuator pulley 18 is also provided with a projection 20 which is driven by hitting the oil pump pulley 17. The oil pump pulley 17 is connected to the cam lever 10 of the oil pump 1 by an operation cable 21. The actuator pulley 18 is connected via an operation cable 22 to an actuator 24 that operates an exhaust valve 23 provided in an exhaust hole. The actuator 24 is operated by a rotation number detector 25 of the ignition pulse. At one side of the joint box 14, a throttle positioner 26 is attached.
The pinion 28 of the operation shaft 27 is engaged with a gear 29 engraved on the outer periphery of the throttle pulley 15 so as to be interlocked therewith.

〔The invention's effect〕

The present invention provides a throttle grip and a joint box provided in the middle of a throttle valve of a carburetor.
The discharge amount of the oil pump can be controlled by both the opening degree of the throttle grip and the engine rotation, so that the amount of lubricating oil can always be properly maintained. In addition, since the movement of the throttle pulley is transmitted to the throttle positioner by widening the movement, the throttle positioner can be moved in response to a slight change in the throttle grip, and precise control can be performed. In this way, the engine can be appropriately controlled in accordance with the opening degree of the throttle grip operated by the driver, and the operation parts can be integrated in one place of the joint box to be compact.

[Brief description of the drawings]

Fig. 1 shows an embodiment of the present invention. Fig. 1 is a cutaway side view of a joint box, Fig. 2 is a plan view thereof, Fig. 3 is an overall side view, Fig. 4 is an operation shaft of a throttle pulley and a throttle positioner. FIG. 5 is a sectional view of an oil pump. 1 ... oil pump, 10 ... cam lever, 11 ... throttle grip, 12 ... throttle valve, 13 ... operation cable, 14 ... joint box, 15 ... throttle pulley, 16 ... support shaft, 17 ... Oil pump pulley, 18 Actuator pulley, 19 Projection, 20 Projection, 21 Operation cable, 22 Operation cable, 23 Exhaust valve, 24 Actuator, 26 Throttle positioner, 27 ... operating shaft, 28 ... pinion, 29 ... gear.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification number Agency reference number FI Technical indication F02D 35/00 364 F02D 35/00 364G

Claims (1)

(57) [Claims] 1. A support shaft attached to a throttle pulley is mounted on a joint box, an operation cable connecting a throttle grip and a throttle valve of a carburetor is connected to the throttle pulley, and an oil pump is provided next to the throttle pulley on the support shaft. The pulley and the actuator pulley are mounted on the shaft, the projections of the throttle pulley and the actuator pulley are brought into contact with one side of the oil pump pulley, the operation cable connected to the cam lever of the oil pump is connected to the oil pump pulley, and the exhaust valve is connected to the actuator pulley. An operation cable connected to an actuator is connected, and a pinion of an operation shaft of a throttle positioner attached to one side of a joint box is meshed with a gear on an outer periphery of a throttle pulley to interlock. Control apparatus of the cycle engine.