JPH0745804B2 - Engine lubrication system for motorcycles - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricating device for a vehicle engine such as a motorcycle in which lubricating oil is appropriately supplied to an engine cylinder.

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

That is, a plunger pump driven by the engine and supplying lubricating oil to the cylinder is provided. On the other hand, a throttle grip for adjusting the throttle opening of the carburetor is connected to the discharge amount adjusting means for adjusting the plunger stroke of the pump.

Then, the plunger stroke changes as the throttle opening is adjusted by operating the throttle grip, and the change in the pump discharge amount due to this changes the amount of lubricating oil that corresponds to the throttle opening of the engine, that is, the amount of lubricating oil that corresponds to the load. Is supplied (JP-A-60-93106).

By the way, in the case of the above configuration, for example, when the throttle opening is suddenly increased for rapid acceleration in a low engine speed range, relatively little lubricating oil is sufficient until the engine speed reaches a high speed. Instead, since the discharge amount of the pump suddenly increases according to the throttle opening, an excessive amount of lubricating oil is supplied into the cylinder.

On the contrary, when the throttle opening was suddenly reduced in the high engine speed range, it was throttled despite the fact that a relatively large amount of lubricating oil was required until the engine speed reached a low speed. Since the discharge amount of the pump suddenly decreases according to the throttle opening, in this case, the lubricating oil in the cylinder tends to run short.

Therefore, if the throttle opening of the carburetor is suddenly opened or closed and the engine speed does not follow this response well, the supply of lubricating oil into the cylinder will not become excessive or insufficient. In order to do so, the carburetor and the throttle grip are interlockingly connected with the wire and the movable member, and
The movable member and the discharge amount adjusting means are interlocked by another wire and a movable link that moves according to the rotation speed of the engine, so that the lubricating oil appropriate for the throttle opening and the rotation speed of the engine is properly connected. There is provided one that is supplied (Japanese Patent Laid-Open No. 61-212618).

(Problems to be solved by the invention) By the way, in the above configuration, in order to interlock and connect the throttle grip and the discharge amount adjusting means, a movable member and other wires are interposed between them, There are many points,
Therefore, the structure of the lubricating device is complicated.

(Object of the Invention) The present invention has been made in view of the above circumstances, and the supply of the lubricating oil to the cylinder is appropriately performed to match the throttle opening and the engine speed. The lubricating oil supply means can be easily applied to various throttle operating portions and discharge amount adjusting means, and the structure for connecting the throttle operating portion to the carburetor and the discharge amount adjusting means can be simplified. The purpose is to make the engine lubrication device a simple structure.

(Structure of the Invention) A feature of the present invention for achieving the above object is that a carburetor connected to an engine and a throttle operating unit for adjusting a throttle opening of the carburetor are connected by a first wire. A pump for feeding the lubricating oil into the cylinder of the engine is provided so that the first wire moves in the longitudinal direction and the throttle opening is adjusted by the operation of the throttle operating portion. Further, in a lubricating device for a vehicle engine such as a motorcycle, which is provided with a discharge amount adjusting means for varying the discharge amount of the pump, a second wire whose one end is connected to the discharge amount adjusting means is provided, while the engine is provided. An actuator that is driven according to the number of rotations of the first wire, and an interlocking wire whose one end is connected to the actuator. The midway part and the other ends of the second wire and the interlocking wire are arranged substantially parallel to each other, and a movable link extending in a direction substantially orthogonal to the midway part of the first wire is provided. The middle part of the first wire is pivotally supported on one end side,
Same as above, the other end of the second wire is pivotally supported at a midway portion in the longitudinal direction of the movable link, and the other end of the interlocking wire is pivotally supported at the other end of the movable link to the throttle operating unit. Operation causes the second wire to move in the longitudinal direction via the movable link to activate the discharge amount adjusting means, and the actuator moves to move the interlocking wire in the longitudinal direction. Then, the other end of the movable link can be moved.

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

In FIG. 1, reference numeral 1 denotes a two-cycle engine, which is a cylinder 2, a piston 3, and a crankshaft 4.
The cylinder 2 has an intake port 6 and an exhaust port 7. 8 is a spark plug.

A carburetor 10 is connected to the intake port 6. The carburetor 10 has a piston valve 11, and the piston valve 11 is biased by a spring 13 in a direction to close an intake passage 12 of the carburetor 10.

The piston valve 11 is connected via a first wire 16 to a throttle grip 17 which is a throttle operating portion. By rotating this throttle grip 17, the first wire
When the piston 16 moves in the longitudinal direction and the piston valve 11 operates, the intake passage 12 is opened and closed, whereby the throttle opening is adjusted. When the throttle opening becomes large, a large amount of air-fuel mixture is sucked into the cylinder 2 accordingly.

On the other hand, the exhaust port 7 is provided with an exhaust control valve 19 that opens and closes the exhaust port 7 according to the number of revolutions of the engine 1 to improve combustion efficiency. This exhaust control valve 19 operates so as to close the exhaust port 7 and delay the exhaust timing when the engine 1 rotates at a low speed (indicated by a chain double-dashed line in FIG. 1).
When the engine 1 is rotating at high speed, the exhaust port 7 is opened to operate so as to accelerate the exhaust timing (shown by the solid line in the above figure). In this case, the means for opening / closing the exhaust control valve 19 according to the rotation speed of the engine 1 is configured as follows.

That is, the rotation 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 control 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.

Then, the servomotor 21 is driven by the detection signal of the igniter unit 20 via the control unit 22, whereby the exhaust control valve 19 is opened / closed according to the rotational speed of the engine 1 as described above.

24 is a plunger type pump, and this pump 24 is an engine 1
The lubricating oil is reciprocated according to the number of revolutions to supply the lubricating oil into the cylinder 2, which is configured as shown in FIGS. 2 and 3.

In the figure, 25 is a pump case, and this pump case 25
A plunger 26 is fitted in the inner cylinder hole so as to be slidable in the axial direction and rotatable about the axis. The plunger 26 is interlockingly connected to the crankshaft 4 by a worm gear device 28, and rotates around the axis center as the crankshaft 4 rotates.

A cam means is provided on one end side of the plunger 26, and when the plunger 26 rotates, the plunger 26 reciprocates 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 the cylindrical cam 30 has a mountain portion 30a and a valley portion 30b alternately formed in the circumferential direction. There is.
On the other hand, a rotary shaft 32 is provided which is rotatable about an axis orthogonal to the plunger 26, and the cylindrical cam 30 is elastically slidably contacted with the outer peripheral surface of the rotary shaft 32 by a spring 33. ing.

When the plunger 26 is rotated by the crankshaft 4 via the worm gear device 28, the crests 30a and the valleys 30b of the cylindrical cam 30 are alternately slidably brought into contact with the outer peripheral surface of the rotation shaft 32, whereby the plunger 26 is rotated. 26 can be reciprocated.

A pump chamber 34 is formed in the pump case 25 on the other end side of the plunger 26. The pump chamber 34 is connected to the oil sump portion 37 via the first check valve 36, and
When the plunger 26 is connected to the intake port 6 via the check valve 38 and reciprocates as described above, the lubricant oil is sucked from the oil sump portion 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 make the discharge amount variable 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 rotating shaft 32. Then, by rotating the rotating shaft 32, the cylindrical cam 30
Before the valley portion 30b of the sliding contact with the outer peripheral surface of the rotating shaft 32, the projection 41
The projection 41 and the eccentric cam 42 are formed so that the eccentric cam 42 contacts the outer peripheral surface of the eccentric cam 42. 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 rotating shaft 32.

In FIGS. 1 and 4, a second wire 43, one end of which is connected to the rotary shaft 32 of the discharge amount adjusting means 40, is provided. The middle of the first wire 16 in the longitudinal direction and the second part
The other end of the wire 43 is arranged substantially parallel to each other. A movable link 45 extending in a direction substantially orthogonal to the middle of the first wire 16 is provided. A case 44 for supporting the midway portion of the first wire 16 is provided so that the midway portion of the first wire 16 moves in the longitudinal direction, and the movable link 45 is accommodated in the case 44.

In the case 44, the midway portion of the first wire 16 in the longitudinal direction is pivotally supported on the one end side 45a of the movable link 45. Further, in the middle of the longitudinal direction of the movable link 45, the second
The other end of the wire 43 is pivotally supported. This second wire 43
The other end of the case 44 also moves so as to move in the longitudinal direction.
Is supported by.

The servomotor 21 is an actuator that is driven according to the number of revolutions of the engine 1. An interlocking wire 46 having one end connected to the servomotor 21 is provided, and the other end of the interlocking wire 46 is also the above-mentioned. The wires 1 are arranged side by side substantially in parallel with the middle part thereof. The other end of the interlocking wire 46 is pivotally supported on the other end side 45b of the movable link 45,
The other end of 6 also moves in the above-mentioned case 4 so that it moves in the longitudinal direction.
It is supported by 4.

The pivotal support between the midway portion of the first wire 16 and the one end side 45a of the movable link 45 will be described with reference to FIGS. 5 to 7.

The middle part of the first wire 16 is divided, and
One end side 45a of the movable link 45 is interposed between the split ends 16a and 16b of the wire 16.

Split end 16 of the first wire 16 on the side of the throttle grip 17
The a and the divided end 16b on the carburetor 10 side are connected to each other by a cylindrical wire terminal 48. On the other hand, one end side of the movable link 45
A terminal insertion hole 49 is formed in 45a, and a wire insertion passage 50 extending from the terminal insertion hole 49 is formed. Then, the wire terminal 48 is inserted into the terminal insertion hole 49 so as to be rotatable about its axis, and each of the divided ends 16a and 16b of the first wire 16 is inserted into the wire insertion passage 50. 1
The middle part of the wire 16 is connected to the one end side 45a of the movable link 45.

Further, when the movable link 45 rotates, notches 51 are formed in this wall surface so that the divided ends 16a, 16b of the first wire 16 and the wall surface of the wire insertion passage 50 do not interfere with each other.

Next, the throttle grip 17 is used to adjust the discharge amount.
The operation of 40 will be described 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, the engine 1 is in the low speed rotation range, and the pump 24 is driven by the servo motor 21 linked to this. Is adjusted so that the plunger stroke is reduced and the supply of lubricating oil to the cylinder 2 is reduced.

From the above state, as shown by the one-dot chain line in the figure, the throttle grip 17 so that the throttle opening of the carburetor 10 is suddenly opened.
When is operated, the split end 16a of the first wire 16 on the throttle grip 17 side moves in the longitudinal direction (see arrow A in FIG. 4).
Direction), one end side 45 of the movable link 45 pulled by this
a rotates about the other end side 45b. In this case, if the rotation speed of the engine 1 has not reached a high speed, the movable link 45
Since the position of the center of rotation does not change much, the amount of pulling of the second wire 43 connected to the middle portion of the movable link 45 can be suppressed to a small value. Therefore, it is possible to suppress an increase in the plunger stroke as compared with a case where the throttle grip 17 is operated to directly operate the discharge amount adjusting means 40, and it is possible to prevent an excessive supply of the lubricating oil to the cylinder 2.

When the engine speed of the engine 1 starts to increase with the lapse of time from the operation of the throttle grip 17, the other end of the interlocking wire 46 is moved by the servo motor 21 accordingly, as shown by the chain double-dashed line in the figure. It is pulled in the longitudinal direction (direction of arrow A in FIG. 4). Therefore, in contrast to the above, the movable link 45 has the other end side 45b rotated around the one end side 45a. Along with this, the other end of the second wire 43 is pulled in the longitudinal direction (direction of arrow A in FIG. 4), the plunger stroke is increased and the cylinder 2
The supply of lubricating oil to the oil is increased to an appropriate value.

On the other hand, if the throttle grip 17 is operated so as to suddenly reduce the throttle opening from the state shown by the two-dot chain line in FIG. 4 above, the throttle grip of the first wire 16 (not shown)
The split end 16a on the 17 side moves in the longitudinal direction (direction of arrow B in FIG. 4), and the one end side 45a of the movable link 45 becomes the other end side 45b.
Rotate around. In this case, if the rotation speed of the engine 1 has not reached a low speed, the center position of rotation of the movable link 45 does not change so much, so that the pushing amount of the second wire 43 can be suppressed to a small value. Therefore, it is possible to suppress a decrease in the plunger stroke as compared with the case where the discharge amount adjusting means 40 is directly operated by operating the throttle grip 17, and it is possible to prevent the supply of the lubricating oil to the cylinder 2 from being insufficient.

When a lapse of time has passed since the operation of the throttle grip 17 and the rotation speed of the engine 1 starts to decrease, the other end of the interlocking wire 46 is moved by the servo motor 21 in the longitudinal direction toward the original position. (Direction of arrow B in FIG. 4). Therefore, in contrast to the above, the movable link 45 has the other end side 45b rotated around the one end side 45a. Then, the other end of the second wire 43 moves toward its original position in the longitudinal direction (direction of arrow B in FIG. 4), the plunger stroke is reduced, and the supply of the lubricating oil to the cylinder 2 is an appropriate value. Can be reduced to.

(Effect of the Invention) According to the present invention, when the throttle opening of the carburetor is adjusted by operating the throttle operating portion and the discharge amount adjusting means of the lubricating pump is adjusted, the condition of the engine speed during this operation is adjusted. Since it is possible to intervene in the adjustment of the discharge amount adjusting means, even if the engine speed does not respond well when the throttle opening is rapidly opened or closed, these throttle opening and engine speed Lubricating oil can be appropriately supplied to the cylinders to match the number.

Moreover, in this case, the means for intervening the engine speed in the adjustment of the discharge amount adjusting means as described above is provided with respect to the movable link that pivotally supports the midway portion of the first wire connecting the throttle operating portion and the carburetor. It is obtained by pivotally supporting the other end of the second wire extending from the discharge amount adjusting means and the other end of the interlocking wire extending from the actuator.

Therefore, firstly, since each wire is flexible and long, it is possible to provide the movable link at a desired position without being affected by the arrangement of the throttle operating portion and the discharge amount adjusting means. it can.

Therefore, there is an effect that the lubrication device can be easily assembled.

Secondly, in the above-described conventional configuration, it is necessary to add a movable member and other wires to the above-described lubricating device, and the configuration is complicated. However, in comparison with this, the lubricating device of the present invention is a component. The number of points is small, and the engine lubrication device can have a simple structure.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, FIG. 1 is an overall view, FIG. 2 is a sectional view of a pump and a discharge amount adjusting means, and FIG.
III-III line sectional view, FIG. 4 is a partially enlarged sectional view of FIG. 1, FIG. 5 is a partially enlarged view of FIG. 4, and FIG. 6 is VI of FIG.
-VI line arrow sectional view, FIG. 7 is a VII-VII line sectional view of FIG. 1 ... Engine, 2 ... Cylinder, 6 ... Intake port,
10-carburetor, 16-first wire, 17-throttle grip (throttle operating part), 21-servo mote (actuator), 24-pump, 40-discharging amount adjusting means, 43-second Wire, 45 …… Movable link, 45a …… One end side, 45b …… Other end side, 46 …… Interlocking wire.

Claims (1)

[Claims] 1. A carburetor connected to an engine and a throttle operating section for adjusting the throttle opening of the carburetor are connected by a first wire, and the first wire is operated by operating the throttle operating section. Moves in the longitudinal direction to adjust the throttle opening, and on the other hand, a pump for feeding lubricating oil into the cylinder of the engine is provided, and a discharge amount adjusting means for varying the discharge amount of the pump is provided. In the provided engine lubrication device for a vehicle such as a motorcycle, a second wire whose one end is connected to the discharge amount adjusting means is provided, and an actuator that drives according to the engine speed is provided and the actuator is provided. An interlocking wire whose one end is connected is provided, and the middle part in the longitudinal direction of the first wire and the other end of each of the second wire and the interlocking wire are mutually connected. And a movable link that extends in a direction substantially orthogonal to the middle of the first wire.
The middle part of the first wire is pivotally supported on one end of the movable link, the other end of the second wire is pivotally supported on the middle part of the movable link in the longitudinal direction, and the other end of the movable link is the same. So that the other end of the interlocking wire is pivotally supported by the portion, and the second wire is moved in the longitudinal direction through the movable link by the operation of the throttle operating portion so that the discharge amount adjusting means is operated. In addition, the lubricating device for an engine for a vehicle such as a motorcycle is characterized in that the interlocking wire is moved in the longitudinal direction thereof by the drive of the actuator so that the other end side of the movable link is moved.