JPS61212618A - Lubricating apparatus for engine for car such as motorcycle - Google Patents

Abstract

PURPOSE:To supply the lubricating oil for cylinder in the proper quantity corresponding to the throttle opening-degree and the engine revolution speed by taking accound of the condition of the engine revolution speed when the discharge quantity of a lubricating pump is adjusted. CONSTITUTION:Though a movable link 45 turns around the one edge on the connection side of an interlocking wire 46, when a throttle grip 17 is sharply operated in a 2-cycle engine 1, the variation of the discharge quantity of a pump 24 for lubrication due to a discharge-quality adjusting means 40 is suppressed, since the position of the divided edge 43b on the discharge-quantity adjusting means 40 side of the second wire 43 is not considerably varied. When the number of engine revolution begins to increase or reduce after the lapse of time form starting operation, the movable link 45 turns around the other edge on the throttle grip 17 side by pulling or pushing of the interlocking wire 46 by a servomotor 21, and the second wire 43 is pulled or pushed, and therefore, the discharge quantity of the pump 24 for lubrication can be increased or reduced to a proper value.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a lubricating device for an engine for a vehicle such as a motorcycle, which allows lubricating oil to be properly supplied to the cylinders of the engine.

(Prior Art) In a motorcycle engine, a cylinder lubricating device is constructed as follows, for example.

That is, a plunger type pump that is driven by the engine and supplies lubricating oil to the cylinder is provided.

On the other hand, a throttle grip that adjusts the throttle opening of the carburetor is configured to adjust the plunger stroke of the pump.

Then, as the throttle opening is adjusted by operating the throttle grip, the plunger stroke changes, and this changes the pump discharge amount.

Lubricating oil is supplied in an amount commensurate with the throttle opening of the engine, that is, in an amount commensurate with the load (Japanese Patent Application No. 58-200500 filed by this applicant).

(Problem to be Solved by the Invention) By the way, in the case of the above configuration, if the throttle N degree is suddenly increased for sudden acceleration, for example in the low engine speed range, the engine speed will not increase until the engine speed reaches high speed. Although a relatively small amount of lubricating oil is sufficient, the pump discharge amount suddenly increases depending on the throttle opening, resulting in an excessive amount of lubricating oil being supplied into the cylinder.

Conversely, if the throttle opening is suddenly reduced in the high engine speed range, the throttle opening will be reduced even though a relatively large amount of lubricant is required until the engine speed reaches low speeds. In this case, the lubricating oil in the cylinder tends to run out because the discharge amount of the pump suddenly decreases depending on the throttle opening.

(Object of the Invention) This invention was made in view of the above-mentioned circumstances, and it is an object of the present invention to appropriately supply lubricating oil to the cylinder in accordance with the throttle opening and engine speed. It is an object of the present invention to enable a lubricating oil supply means to be easily applied to various throttle operation section ejection amount adjustment means.

(Structure of the Invention) A feature of the present invention for achieving the above object is that the wire connecting the throttle operating section of the carburetor and the discharge amount adjusting means of the lubricating oil pump is divided in the middle. A movable link is interposed between the split ends, and the split end of the split wire on the throttle operation part side is connected to one end side of the movable link, while the split end of the split wire is connected to the middle part in the longitudinal direction of the movable link. The other split end is connected, and the other end of the movable link is moved in a direction substantially parallel to the split end of the wire as the engine speed increases.

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

In FIG. 1, l is a two-stroke engine, and this engine l has cylinders 2. Piston 3. and crankshaft 4
The cylinder 2 has an intake port 6 and an exhaust port 7 formed therein. 8 is a spark plug.

A carburetor 10 is connected to the intake boat 6. This carburetor 10 has a piston valve 11.
is biased by a spring 13 in a direction to close the intake passage 12 of this carburetor IO.

The piston valve 11 is connected via a first wire 16 to a throttle grip 17, which is a throttle operating section. The rotation of the throttle grip 17 causes the piston valve 11 to operate, thereby opening and closing the intake passage 12, thereby adjusting the throttle opening. Then, as the throttle opening increases, a large amount of air-fuel mixture is sucked into the cylinder 2.

On the other hand, the exhaust port 7 is provided with an exhaust adjustment valve 19 that opens and closes the exhaust port 7 according to the rotational speed of the engine 1 to improve combustion efficiency. This exhaust adjustment valve 19 operates to close the exhaust port 7 and delay the exhaust timing when the engine is rotating at low speed (as shown by the dashed line in Figure 1), and opens the exhaust port 7 to advance the exhaust timing when the engine is rotating at high speed. In this case, the means for opening and closing the exhaust regulating valve 19 in accordance with the rotational speed of the engine 1 is constructed as follows.

That is, the rotational speed of the engine 1 is detected by the ignition signal of the igniter unit 20 for operating the engine 1. On the other hand, the exhaust regulating valve 19 is driven by a servo motor 21, and the servo motor 21 is connected to the igniter unit 20 via a control unit 22.

The detection signal from the igniter unit 20 causes the servo motor 21 to be activated via the control unit 22.
is driven, whereby the exhaust regulating valve 19 is opened and closed according to the rotational speed of the engine 1 as described above.

Reference numeral 24 denotes a plunger type pump, which reciprocates according to the rotational speed of the engine 1 to supply lubricating oil into the cylinder z, and is constructed as shown in FIGS. 2 and 3.

In the figure, reference numeral 25 denotes a pump case, and a plunger 26 is fitted into a cylinder hole in the pump case 25 so as to be slidable in the axial direction and rotatable about the axis. This plunger 26 is interlocked and connected to the crankshaft 4 by a worm gear device 28, and is rotated around the axis as the crankshaft 4 rotates.

A cam means is provided on one end side of the plunger 26,
When the plunger 26 rotates, the plunger 26 is reciprocated in the axial direction by the cam means.

That is, the cam means has a cylindrical cam 30 coaxially formed on one end side of the plunger 26, and this cylindrical cam 30 has peaks 30a and valleys 30b alternately formed in the circumferential direction. There is. On the other hand, a rotating shaft 32 is provided which is rotatable about an axis orthogonal to the plunger 26, and the cylindrical cam 30 is elastically brought into sliding contact with the outer peripheral surface of the rotating ring 32 by a spring 33. There is.

When the plunger 26 is rotated by the crankshaft 4 via the worm gear device 28, the cylindrical cam 3
The plunger 26 is caused to reciprocate as the peak portions 30a and valley portions 30b alternately come into sliding contact with the outer peripheral surface of the rotating shaft 32.

Also, the pump case 25 on the other end side of the plunger 26
A pump chamber 34 is formed therein. This pump chamber 34 is connected to an oil sump 37 via a first check valve 36 and to the intake port 6 via a second check valve 38, so that when the plunger 26 reciprocates as described above,
Lubricating oil is sucked from the oil sump 37 and supplied into the cylinder 2 through the intake port 6.

The pump 24 is provided with a discharge amount adjusting means 40 that adjusts the plunger stroke to vary the discharge amount for each stroke of the pump 24.

The discharge amount adjusting means 40 has a protrusion 41 provided on one end surface of the plunger 26 and an eccentric cam 42 formed on the rotation shaft 32. Then, rotate the rotation shaft 32.
If so, the protrusions 41 and the eccentric cam 42 are formed so that the protrusions 41 come into contact with the outer surface of the eccentric cam 42 before the trough 30b of the cylindrical cam 30 comes into sliding contact with the outer peripheral surface of the rotating shaft 32. Then, the plunger stroke is adjusted by selecting the engagement position of the protrusion 41 with respect to the eccentric cam 42 by rotating the rotation shaft 32.

The throttle grip 17 is connected to the rotating shaft 32 via a second wire 43, and the discharge amount of the pump 24 changes in accordance with the throttle opening degree by operating the throttle grip 17.

In FIG. 1 and FIG. 4, the second wire 43 is divided in the middle, and the divided end 43a of the second wire 43 is divided.
, 43b, a movable link 45 covered with a case 44 is interposed. One end side 45a of this movable link 45
The split end 43a of the split second wire 43 on the throttle grip 17 side is connected to the split end 43a. Furthermore, a split end 43b of the second wire 43, which is split as above, on the side of the discharge amount adjusting means 40 is connected to the middle part of the movable link 45 in the longitudinal direction. Further, one end of an interlocking wire 46 interlocking with the servo motor 21 is connected to the other end side 4° 5b of the link 45, and one end of the interlocking wire 46 is connected to each divided end 43a of the second wire 43.

43b.

Discharge amount adjusting means 40 using the throttle grip 17
The operation will be explained in detail with reference to FIG.

In the state shown by the solid line in the figure, the throttle grip 17 is operated so that the throttle opening of the carburetor 10 is closed, and the engine 1 is in a low speed rotation range, and the pump 24 is operated by the servo motor 21 in conjunction with this. The plunger stroke of is reduced so that the supply of lubricating oil to cylinder °2 is reduced.

From the above state, as shown by the dashed line in the figure, the vaporizer 10
When the throttle grip 17 is operated to suddenly open the throttle opening, the movable link 45 is pulled by the split end 43a of the second wire 43 on the throttle grip 17 side.
One end side 45a rotates around the other end side 45b.

In this case, if the rotational speed of engine l has not reached high speed.

Since the rotational center position of the movable link 45 does not change much, the amount of tension of the second wire 43 on the side of the discharge amount adjusting means 40 connected to the middle part of the movable link 45 can be kept small. Therefore, an increase in the plunger stroke is suppressed by operating the throttle grip 17 compared to directly operating the discharge amount adjusting means 40, and excessive supply of lubricating oil to the cylinder 2 is prevented.

When time has elapsed since the throttle grip 17 was operated, the rotational speed of the engine 1 begins to increase.

As shown by the two-dot chain line in the figure, the interlocking wire 46 is pulled by the servo motor 21 accordingly. Therefore,
Contrary to the above, the movable link 45 has its other end 45b rotated about the one end 45a. Accordingly, the divided end 43b of the second wire 43 on the side of the discharge amount adjusting means 40 is pulled, the plunger stroke is increased, and the supply of lubricating oil to the cylinder 2 is increased to an appropriate value.

On the other hand, when the throttle grip 17 is operated to suddenly reduce the throttle opening from the state shown by the two-dot chain line in the same figure, the second wire 43 is pushed by the split end 43a on the throttle grip 17 side (not shown) and moves. One end side 45a of the link 45 rotates around the other end side 45b. In this case, unless the rotational speed of the engine l has reached a low speed, the rotational center position of the movable link 45 does not change much.
The pushing amount of the second wire 43 on the side of the discharge amount adjusting means 40 can be kept small. Therefore, by operating the slow grip 17, the decrease in the plunger stroke is suppressed more than by directly operating the discharge amount adjusting means 40, and insufficient supply of lubricating oil to the cylinder 2 is prevented.

When the rotational speed of the engine 1 begins to decrease as time passes from the operation of the throttle grip 17, the interlocking wire 46 is pushed by the servo motor 21 accordingly. Therefore, contrary to the above, the movable link 45 has a length of 45 m on the one end side.
The other end side 45b is rotated around . and,
The divided end 43b of the second wire 43 on the side of the discharge rate adjusting means 40 is pushed, the plunger stroke is reduced, and the supply of lubricating oil to the cylinder 2 is reduced to an appropriate value.

(Effects of the Invention) According to the present invention, when adjusting the discharge amount adjusting means of the lubrication pump by operating the throttle operation section, the condition of the engine rotation speed at the time of this operation is intervened in the adjustment of the discharge amount adjusting means. Therefore, even if the engine speed does not respond well when the throttle opening is suddenly opened or closed, the cylinder will be adjusted appropriately to match the throttle opening and engine speed. Lubricating oil can be supplied.

Moreover, in this case, there is no means for intervening the engine speed in the adjustment of the discharge amount adjusting means as described above.

A movable link is interposed in the middle of a wire that connects the throttle operating section and the discharge amount adjusting means.In this case, since the wire is flexible and long, the throttle operating section and It is possible to select a desired part and interpose a movable link without being affected by the shape or arrangement of the discharge rate adjusting means. Therefore, this lubricating device is suitable for various throttle operation parts and discharge rate adjusting means. Can be easily applied.

[Brief explanation of drawings]

The figures show an embodiment of the invention, with FIG. 1 being an overall view and FIG. 2 being a sectional view of the pump and discharge amount adjusting means. 3 is a sectional view taken along the line ■--■ in FIG. 2, and FIG. 4 is a partial sectional view of FIG. 1. 1...Engine 211 +1 cylinder, 10...Carburizer, 17--Throttle grip (throttle operation part)
, 21. Servo motor, 24. Pump, 40. Discharge amount adjusting means, 43.- Second wire (wire), 43a.
*・Split end on the throttle grip side, 43b-・Split end on the discharge amount adjustment means side, 45・・Movable link, 45a・・
One end side, 45b@-other end side, 46... Interlocking wire. Figure 2 Figure 3

Claims (1)

[Claims] 1. A pump for feeding lubricating oil into the cylinder is provided, and a discharge amount adjusting means is provided to make the discharge amount of this pump variable, so that the discharge amount of the pump changes as the throttle opening of the carburetor is adjusted. In a lubricating device for an engine of a vehicle such as a motorcycle, in which a throttle operation part for adjusting the throttle opening and the above-mentioned discharge amount adjusting means are interlocked and connected by a wire, the middle part of the wire is divided and the part is movable between the divided ends. A link is interposed, and the split end of the split wire on the throttle operation unit side is connected to one end side of the movable link, while the other split end of the split wire is connected to the middle part in the longitudinal direction of the movable link. A lubricating device for an engine for a vehicle such as a motorcycle, characterized in that the other end of the movable link moves in a direction substantially parallel to the divided end of the wire as the engine rotates.