JPS6148616B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an engine lubricating oil supply device for supplying lubricating oil to the intake system of an engine such as a two-stroke engine, and more particularly, the present invention relates to an engine lubricating oil supply device that supplies lubricating oil to the intake system of an engine such as a two-stroke engine. The present invention relates to a lubricating oil supply device that supplies lubricating oil to this intake system.

In engines such as two-cycle engines that supply lubricating oil to the combustion chamber by mixing lubricating oil into the air-fuel mixture in the intake system, as the engine speed increases, a larger amount of lubricating oil must be supplied.
In order to meet such demands, lubricating oil supply devices have been used that control the amount of lubricating oil supplied to the intake system in accordance with the throttle valve opening of the engine. For example, as described in Japanese Patent Application Laid-Open No. 56-44409, this lubricating oil supply device links the flow rate control lever of the lubricating oil supply pump with a throttle valve, and supplies lubricating oil in response to an increase in the throttle valve opening. It is formed to increase the discharge amount of the pump.

On the other hand, today, engines in which intake air or air-fuel mixture is precompressed by a supercharger such as a turbocharger are being widely put into practical use for the purpose of increasing output and reducing fuel consumption. Such a supercharger is of course installed in an engine that supplies lubricating oil to the intake system, such as the aforementioned two-stroke engine. Generally, such superchargers are configured to start supercharging after the throttle valve is fully opened, but if supercharging is performed after the throttle valve is fully opened, the engine will not be supercharged even if the throttle valve is fully open. Compared to this, the amount of intake air increases and the rotational speed increases, so a larger amount of lubricating oil must be supplied to the engine than when the throttle valve is fully open and there is no supercharging.

However, as mentioned above, when lubricating oil is supplied to an engine equipped with a supercharger using a lubricating oil supply device that controls the discharge amount of the lubricating oil supply pump in accordance with the throttle valve opening, supercharging occurs. The discharge amount of the lubricating oil supply pump will be the same whether the engine is running or not. If the discharge amount of the lubricating oil supply pump when the throttle valve is fully open is set to match the non-supercharging state, the amount of lubricating oil will be insufficient during supercharging. On the other hand, if the discharge amount of the lubricating oil supply pump when the throttle valve is fully open is set to match the supercharging state, more lubricating oil than is required will be supplied to the engine when no supercharging is being performed, which is not only uneconomical but also reduces lubrication. Oil contains organic phosphorus, and increasing the amount of lubricating oil more than necessary will also promote P poisoning of the exhaust gas purification catalyst.

The present invention has been made in view of the above circumstances, and is a lubricating oil supply device that supplies lubricating oil to the intake system of an engine equipped with a supercharger in the intake system, both when the engine is being supercharged and when the engine is not supercharging. It is an object of the present invention to provide a lubricating oil supply device that can always supply an optimum amount of lubricating oil to an engine.

The lubricating oil supply device for an engine according to the present invention controls the discharge amount of the lubricating oil supply pump by a first control means that operates according to the opening degree of a throttle valve, and when the engine is supercharged, the first control means operates. The present invention is characterized in that the amount of lubricating oil supplied during supercharging is increased by the second control means which operates so as to increase the discharge amount determined by the means.

According to the engine lubricating oil supply device of the present invention as described above, an optimum amount of lubricating oil is supplied to the engine under the control of the first control means during non-supercharging. During supercharging, an optimal amount of lubricant oil increased by the second control means can be supplied to the supercharged engine that requires more lubricant oil.

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

FIG. 1 shows an engine lubricating oil supply system according to one embodiment of the present invention. The engine to which the lubricating oil supply device of this embodiment is attached includes a supercharger 2 such as a turbocharger in an intake passage 1, and a throttle valve 3,
It has a lubricating oil supply nozzle 4. The throttle valve 3 is fixed to a throttle lever shaft 5, and when the throttle lever shaft 5 is rotated, it rotates within the intake passage 1 to control the amount of intake air. One end of the throttle lever shaft 5 is fixed to a throttle lever 6, and is rotated by operating an accelerator wire 7 connected to the throttle lever 6.

A first control lever 8 whose tip end 8a is bent in the direction of the throttle valve 3 is fixed to the other end of the throttle lever shaft 5. As shown in detail in exploded view in FIG. 2, a pump control lever 9 having a cylindrical boss portion 9a is inserted through the throttle lever shaft 5. Since the boss portion 9a of the pump control lever 9 is loosely inserted into the throttle lever shaft 5, the pump control lever 9 can freely rotate relative to the throttle lever shaft 5. A protrusion 9b is provided at the outer end of the pump control lever 9,
A rod 10 is locked to this protrusion 9b. This rod 10 is connected to the lubricating oil supply nozzle 4.
The lubricating oil supply pump 11 is connected to a control member 12 of a lubricating oil supply pump 11 that supplies lubricating oil into the intake passage 1 from there. In the lubricating oil supply pump 11, the control member 12 is a first
It is configured to increase the amount of lubricant discharged when rotated in the direction of arrow A in the figure, and to decrease the amount of lubricant supplied when rotated in the direction of arrow B. Pump control lever 9
A second control lever 13 is attached to the cylindrical boss portion 9a.
is inserted. This second control lever 13 also
Since it is loosely inserted into the boss portion 9a, the second control lever 13 can freely rotate relative to the pump control lever 9 and the throttle lever shaft 5. The outer end of the second control lever 13 is extended into two parts. A projecting portion 13a extending toward the pump control lever 9 is formed at one outer end. A circular opening 13b is provided at the other outer end, and a tip 14a of a connecting rod 14 whose tip is bent at a right angle is passed through the opening 13b. The tip 14a of the connecting rod 14 is the opening 1
3b, the connecting rod 14 can freely rotate relative to the second control lever 13. The connecting rod 14 is connected to a diaphragm (not shown) in a diaphragm device 15, and moves in the directions of arrows C and D in FIG. 1 as the diaphragm expands and contracts. A pressure conduit 16 extends from the diaphragm device 15, and the tip of this pressure conduit 16 is connected to the intake passage 1 downstream of the supercharger 2.
The pressure conduit 16 is connected to a diaphragm chamber that applies back pressure to the diaphragm of the diaphragm device 15. Therefore, when the intake air pressure downstream of the supercharger 2 increases, the diaphragm expands and the connecting rod 14
is moved in the direction of arrow C. When the intake air pressure decreases, the diaphragm contracts and the connecting rod 14 retreats in the direction of arrow D.

The operation of the engine lubricating oil supply device of this embodiment having the above structure will be described below. The pump control lever 9, which can freely rotate with respect to the throttle lever shaft 5, has its lower side 9c received by the tip 8a of the first control lever 8. Therefore, when the accelerator wire 7 is pulled upward in FIG. 1 and the throttle lever shaft 5 is rotated clockwise in the diagram to move the throttle valve 3 in the opening direction, the pump control lever 9 is moved upward in the throttle lever shaft. The first rotating with 5
It is pushed up from below in the figure by the control lever 8 and rotates together with the first control lever 8. When the pump control lever 9 is thus rotated clockwise in FIG. 1, the rod 10 is pulled upward in the diagram. Then, the control member 12 of the lubricating oil supply pump 11
The lubricating oil supply pump 1 is rotated in the direction of arrow A in the figure.
The lubricating oil discharge amount of No. 1 is increased. Conversely, when the throttle lever shaft 5 is rotated counterclockwise in FIG. 1 so as to move the throttle valve 3 in the closing direction, and the first control lever 8 is rotated counterclockwise, the pump control lever 9 is moved in the lubricating oil direction. The supply pump 11 is rotated following this first control lever 8 by the elastic force of a spring (not shown) provided in the supply pump 11 . Therefore, the control member 12 of the lubricant supply pump 11 is rotated in the direction B in FIG. 1, and the discharge amount of the lubricant supply pump 11 is reduced.

As described above, the amount of lubricating oil supplied is controlled according to the opening degree of the throttle valve 3, but the second control lever 13 is extended within the range where the amount of lubricating oil discharge is controlled by the opening degree of the throttle valve 3. Part 13
a is set so as not to come into contact with the lower side portion 9c of the pump control lever 9. After the throttle valve 3 is fully opened, when the engine reaches a predetermined rotational speed and the supercharger 2 is activated, the intake air pressure downstream of the supercharger 2 increases and is connected to this part by a pressure conduit 16. The back pressure on the diaphragm of the diaphragm device 15 increases. Then, the diaphragm expands and the connecting rod 14 is moved in the direction of arrow C in FIG. As the connecting rod 14 moves in this manner, the second control lever 13 is rotated clockwise in FIG. 1 about the throttle lever shaft 5.
When the second control lever 13 rotates, its overhang 13
a pushes up from below the lower part 9c of the pump control lever 9, which is set to the position corresponding to the fully open throttle by the first control lever 8, and further rotates the pump control lever 9 clockwise in the figure. let
When the pump control lever 9 is rotated in this way,
The control member 12 is rotated in the direction of arrow A via the rod 10, and the discharge amount of the lubricating oil supply pump 11 is increased. When supercharging stops, the diaphragm device 15
The diaphragm of is compressed to its original state, and the connecting rod 1
4 withdraws in the direction of arrow D in FIG. Therefore, the pump control lever 9 rotates until it comes into contact with the first control lever 8, and the discharge amount of the lubricating oil supply pump 11 is determined only by the first control lever 8, and corresponds to the fully open throttle valve. reduced to Naturally, the amount of lubricating oil discharged when the control member 12 is rotated by operating the second control lever is set to the amount of lubricating oil necessary for the engine in the supercharged state with the throttle valve fully open.

FIG. 3 illustrates changes in the amount of lubricant discharged from the lubricant supply pump 11 controlled as described above. When the throttle valve 3 is not fully opened (in this example, it is 1/2 open), the lubricating oil discharge amount simply increases as the engine speed increases, as shown by a in the figure. When the throttle valve 3 is fully opened, as shown by b in the figure, the lubricating oil discharge amount is generally increased compared to when the throttle valve is 1/2 open. When the engine reaches a predetermined rotational speed (3000 rpm in this example) when the throttle valve is fully open, supercharging begins. Then, the amount of lubricating oil discharged is increased by the amount indicated by c in the figure by the rotation of the second control lever 13 described above. For engines that are supercharged using a turbocharger that uses exhaust energy to turn the turbine, when the engine is suddenly accelerated, the engine speed will exceed a predetermined speed until the turbine starts operating. It takes some time. Therefore, even when the lubricating oil discharge amount changes, a response delay as shown by the broken line b' in FIG. 3 occurs.

FIG. 4 shows an engine lubricating oil supply system according to another embodiment of the present invention. The lubricating oil supply device shown in FIG. 4 is a lubricating oil supplying pump whose discharge amount is increased or decreased by rotating the control member 100 in the directions of arrows E and F in the figure, similar to the device shown in FIG. It has 101. The control member 100 is provided with an opening 100a, and a connecting rod 102 is loosely inserted into the opening 100a. This connecting rod 10
One end of the throttle lever shaft 104 is connected to one end of the throttle lever shaft 104 via a rod 103. A throttle valve 106 disposed in an intake passage 105 is fixed to the throttle lever shaft 104, and a throttle lever 1 to which an accelerator wire 107 is connected is attached to the other end of the throttle lever shaft 104.
08 is fixed. A pedestal 109 is fixed to the other end of the connecting rod 102. This pedestal 10
9 is fixed to a rod guide tube 111 fixed to the main body of the diaphragm device 110. The inside of the diaphragm device 110 is partitioned into two chambers by a diaphragm 112, and the upper chamber in the figure is partitioned by a spring 113.
The lower chamber is a back pressure chamber 115.
It is becoming. The back pressure chamber 115 is communicated with the downstream portion of the supercharger 118 of the intake passage 105 via a flexible tube 116 and a pressure conduit 117. A rod 119 that can slide within the rod guide tube 111 is inserted into the rod guide tube 111 . The lower end of the rod 119 in the figure is fixed to the diaphragm 112 within the diaphragm device 110. The diaphragm device 110 is arranged at a position where the upper end of the rod 119 extending from the center can come into contact with the lower surface of the control member 100.

When the throttle lever shaft 104 is rotated to move the throttle valve 106 in the opening direction, the connecting rod 102 is pulled upward in FIG. 4. Then pedestal 1
The entire diaphragm device 110, which is fixed to the connecting rod 102 via the connecting rod 09, is pulled upward in the figure. Pressure conduit 117 and diaphragm device 1
10 are connected via a flexible tube 116, so that the diaphragm device 110 can be moved in this way. When the diaphragm device 110 is moved upward, the upper end of the rod 119 extending upward from the center of the diaphragm device 110 comes into contact with the lower surface of the control member 100, and the control member 100
is rotated in the direction of arrow E in FIG. Control member 1
When 00 is rotated in this manner, the discharge amount of the lubricating oil supply pump 101 is increased. Conversely, the throttle valve 106 is moved in the closing direction, and the connecting rod 102
is moved downward in the figure, the diaphragm device 1
The whole 10 descends. When the diaphragm device 110 is lowered, the control member 100 moves the diaphragm device 1
While in contact with the upper end of the rod 119 of 10, it rotates in the direction of arrow F in the figure due to the elastic force of a spring (not shown) provided in the lubricating oil supply pump 101, and the discharge amount of the lubricating oil supply pump 101 increases. is reduced. After the throttle valve 106 is fully opened and the diaphragm device 110 is lifted to the highest position, when the engine speed reaches a predetermined speed and the supercharger 118 is activated, the intake air pressure downstream of the supercharger 118 rises. Then, the pressure in the back pressure chamber 115 communicating with this portion via the pressure conduit 117 and the flexible tube 116 increases. spring 113
The one that is compressed by the pressure increase in the back pressure chamber 115 during supercharging is selected and used.
The diaphragm 112 overcomes the force of the spring 113 and expands upward (see FIG. 5). Therefore, the rod 119 fixed to this diaphragm 112 slides upward within the rod guide tube 111, causing the control member 100 to further rotate in the direction of arrow E, thereby further increasing the discharge amount of the lubricating oil supply pump 101. If supercharging is stopped, diaphragm 1
The back pressure applied to the diaphragm 112 decreases and the diaphragm 112
returns to the position shown in FIG. The rod 119 therefore slides downward within the rod guide tube 111, and the control member 100 is returned to its pre-supercharging position.

As explained above, according to the engine lubricating oil supply device of this embodiment, similar to the device shown in FIG.
When the engine is not supercharged, the amount of lubricating oil corresponding to the throttle valve opening is supplied to the engine, and when the engine is being supercharged, the amount of lubricating oil determined by the throttle valve opening plus a predetermined amount is supplied. Become so.

In both of the two embodiments described above, the discharge amount of the lubricating oil supply pump is controlled by mechanical means, but it is also possible to configure the discharge amount control means electrically. FIG. 6 shows another embodiment of the present invention in which such an electrical discharge amount control means is used. The electric lubricating oil supply pump 200 is connected to a power source 202 via an ignition switch 201 . And ignition switch 201 and lubricating oil supply pump 2
00, there is a variable resistor unit 203 and ON-
An OFF switch 204 is arranged in parallel.
The movable piece 203a of the variable resistor 203 is connected to a throttle valve (not shown) of the engine, and when the throttle valve is operated in the opening direction, the variable resistor 20
Move in the direction of lowering the resistance value of 3. Conversely, when the throttle valve is operated in the closing direction, it moves in the direction of increasing the resistance value. By changing the resistance value of the variable resistor 203 in this manner, the current value supplied to the electric lubricating oil supply pump 200 is increased or decreased, and the discharge amount of this lubricating oil supply pump 200 is increased or decreased. That is, the discharge amount of the lubricating oil supply pump 200 is increased in accordance with the increase in the opening degree of the throttle valve. ON-OFF switch 204
is connected to a supercharger (not shown) of the engine by mechanical means, electrical means, etc., and is configured to open when the supercharger is not in operation and close when the supercharger is in operation. After the throttle valve is fully opened and the variable resistor 203 is set to the minimum resistance value, when the supercharger is activated, the ON-OFF switch 204 is closed. Therefore, the current from the power supply 202 is now supplied to the lubricating oil supply pump 200 without passing through the variable resistor 203, and the discharge amount of the lubricating oil supply pump 200 is lower than when there is no supercharging and the throttle valve is fully open. It will be further increased. When supercharging is stopped, the ON-OFF switch 204 is opened, and the discharge amount of the lubricating oil supply pump 200 is returned to the value determined by the resistance value of the variable resistor 203.

As explained in detail above, according to the engine lubricating oil supply device of the present invention, the optimum amount of lubricating oil is always supplied to the engine, whether in supercharging or non-supercharging. Therefore, by using the engine lubricating oil supply device of the present invention, a good lubrication effect can be obtained extremely economically, and moreover, the above-mentioned P poisoning of the exhaust gas purifying catalyst is unnecessarily promoted. There will be no more.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an engine lubricating oil supply device according to an embodiment of the present invention, FIG. 2 is an exploded perspective view showing a part of the device in FIG. 1 in detail, and FIG.
FIG. 4 is a partially cutaway side view showing a lubricating oil supply device for an engine according to another embodiment of the present invention; FIG. FIG. 5 is a partially cutaway side view illustrating the operation of the apparatus shown in FIG. 4, and FIG. 6 is a schematic diagram showing still another embodiment of the present invention. 1,105...Intake passage, 2,118...Supercharger, 3,106...Throttle valve, 5,104...
...Throttle lever shaft, 8...First control lever,
9...Pump control lever, 11,101,200
... Lubricating oil supply pump, 12,100 ... Control member, 13 ... Second control lever, 14,102 ...
Connecting rod, 15, 110...Diaphragm device, 1
6,117...pressure conduit, 109...pedestal, 11
1... Rod guide tube, 119... Rod, 20
3... Variable resistor, 203a... Movable piece, 204
...ON-OFF switch.

Claims (1)

[Claims] 1. In an engine lubricating oil supply device that uses a lubricating oil supply pump to supply lubricating oil to the intake system of an engine equipped with a supercharger in the intake system, the lubricating oil supply device operates according to the opening degree of a throttle valve of the engine. lubricating oil supply for an engine, characterized in that a first control means for controlling the discharge amount of the lubricating oil supply pump, and a second control means for operating to increase the discharge amount during supercharging. Device.