JPH0913930A - Lubricating device for internal combustion engine - Google Patents

Abstract

PURPOSE: To miniaturize a crankcase, reduce the deterioration of oil and the corrosion of an engine, and simplify the driving mechanism of a scavenging pump, a supplying pump, and a water pump. CONSTITUTION: A scavenging pump 3 and a supplying pump 4 are provided directly below a crankcase 1, and the installation space of a water pump 2 is secured at the lower section of the crankcase 1. The blow-by gas is efficiently discharged, the corrosion of an engine is reduced, the stirring of a lubricant by a crankshaft 6 is eliminated, and the deterioration of the lubricant is reduced. No oil tank is provided at the lower section of the crankcase 1, the crankcase 1 is miniaturized, three apparatuses are driven by a crank pulley 7 via a chain 10, and its driving mechanism can be simplified.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dry sump type lubricating system for an internal combustion engine.

[0002]

2. Description of the Related Art As a conventional dry sump type lubricating device for an internal combustion engine, there is one disclosed in Japanese Patent Application Laid-Open No. 1-110820. This lubricating device is provided with an oil tank inside the crank chamber, the oil tank is diagonally partitioned by a partition wall to form an oil reservoir, and the partitioned oil tank and the oil pump are respectively provided inside the oil reservoir. The two oil pumps are driven coaxially by extending the axes of the cam drive pulley and the driven gear. Then, the lubricating oil stored in the partitioned oil reservoir is pumped up to an oil tank by an oil pump, and the lubricating oil in the oil tank is supplied to each part of the engine by the oil pump for lubrication.

Japanese Laid-Open Patent Publication No. 3-107516 discloses another dry sump lubrication system for an internal combustion engine. In the lubrication device disclosed in this publication, the lower part of the crank chamber is partitioned by a partition wall to form an oil tank and an oil reservoir, and a scavenging pump and a pressure pump, which are driven by a common shaft, are arranged in the oil tank. , Position the suction port of the scavenging pump in the oil sump, suck up the lubricating oil accumulated in the oil sump into the oil tank, and supply the lubricating oil in the oil tank to the various parts of the engine with the pressure pump for lubrication. I am trying.

[0004]

In each of the above-mentioned conventional examples, an oil tank is provided in the lower part of the crank chamber, and a scavenging pump and a pressure pump are provided in this oil tank. In order to secure the above, an oil tank having a capacity obtained by subtracting the capacity of these pumps is required, and there is a problem that the oil tank becomes large and the crank chamber itself becomes large.

Further, in the one disclosed in Japanese Patent Laid-Open No. 3-107516, since the sprocket for driving the pump is in the oil tank, there is a loss of energy due to agitation of oil and deterioration of lubricating oil. There is a problem of being promoted. In addition, in each of these conventional examples, although two pumps, a scavenging pump and a pressure pump, are used to perform dry sump type lubrication,
Since these two pumps are installed in the crank chamber, the air in the blow-by gas cannot be removed,
Furthermore, since the ventilation in the crank chamber is not possible, there are problems of deterioration of lubricating oil and engine corrosion.

Although not disclosed in these conventional examples, when the water pump is installed in the lower part of the crank chamber, the vehicle height cannot be lowered, and the water pump is provided only in a part other than the lower part of the crank chamber. When installed, there is a problem that the location is limited and the drive mechanism of the water pump becomes complicated.

According to the present invention, a scavenging pump, a supplying pump and a water pump are arranged below the crank chamber to miniaturize the crank chamber and efficiently discharge blow-by gas to prevent deterioration of oil. (EN) A lubrication device for an internal combustion engine, which solves the problem of engine corrosion and further simplifies the drive mechanism of a scavenging pump, a supplying pump and a water pump.

[0008]

[Means for Solving the Problems] Means for solving the above problems, which can be grasped from the description of claim 1 according to the present invention, is a water immediately below a crank chamber and parallel to the axial direction of a crankshaft. A pump is provided, a supplying pump and a scavenging pump which are driven by the same rotary shaft are provided beside the water pump, and a chain is provided on a crank pulley, a water pump pulley, and pulleys provided on the driving shafts of the supplying pump and the scavenging pump. Or, it is characterized by a belt.

The means grasped from the second aspect is that in the scavenging pump and the supplying pump, one drive shaft is provided with two drive gears,
Driven gears that mesh with the respective drive gears are provided on both sides of the drive shaft to form a supplying pump and a scavenging pump.

Further, the means grasped from the third aspect is that in the crank chamber according to the first and second aspects, the lubricating oil dropping passage is formed around and around the crank chamber, and the bottom portion of the crank chamber is formed. Is provided with a communication hole communicating with the passage, a lubricating oil discharge hole is provided at the bottom of the passage, and a scavenging pump is attached to the lubricating oil discharge hole of the passage.

[0011]

Since the present invention is constructed as described above, it has the following effects. That is, in the means understood from the description of claim 1, by disposing the scavenging pump and the supplying pump immediately below the crank chamber,
You can secure the installation space for the water pump,
In addition, the lubricating oil that has flowed down in the crank chamber is directly sucked out by the scavenging pump so that no oil tank is provided below the crank chamber.

Further, by providing a water pump and a scavenging pump driven coaxially and a supplying pump in parallel to the axial direction of the crankshaft, the crank pulley, the water pump driving pulley, the scavenging pump and the supplying pump are provided. It becomes possible to arrange the drive pulley of the pump in the same plane. Then, a chain or belt drives the water pump, the scavenging pump, and the supplying pump by the crank pulley.

Further, in the means understood from the second aspect of the present invention, since a driven gear that meshes with a drive gear provided on this drive shaft is provided on both sides of one drive shaft, lubricating oil for the scavenging pump is provided. It is possible to reverse the flow direction of the oil and the flow direction of the lubricating oil of the supplying pump.

In the means as understood from the third aspect, a lubricating oil removing passage is formed around and at the bottom of the crank chamber, a communication hole is opened at the bottom of the crank chamber, and a discharge hole is provided at the bottom of the passage. Since the scavenging pump is attached to the above, it is possible to form the dry sump type lubrication without forming the lubricating oil reservoir at the bottom of the crank chamber.

[0015]

An embodiment of the present invention will be described below. In FIG. 1, a water pump 2 is provided directly below the crank chamber 1,
Scavenging pump 3 and supplying pump 4
The water pump 2, the scavenging pump 3, and the supplying pump 4 are arranged in parallel in the horizontal direction. The scavenging pump 3 and the supplying pump 4 are driven by a common drive shaft 5, as will be described later.

Further, the rotary shaft cores of the water pump 2, the scavenging pump 3 and the supplying pump 4 are
The crank sprocket (or pulley) 7 provided on the crankshaft 6, the water pump sprocket (or pulley) 8 for driving the water pump 2, and the common The oil pump drive sprocket (or pulley) 9 provided on the drive shaft 5 is arranged in the same plane, and the crank sprocket 7, water pump sprocket 8 and oil pump drive sprocket 9 have one endless chain. A belt (or belt) 10 is applied, and the water pump 2, the scavenging pump 3 and the supplying pump 4 are driven by a crank sprocket 7.

FIG. 2 is a partial cross-sectional view taken along the line AA of FIG. 1, in which the axis of the scavenging pump 3 is the axis of the shaft 301 and the axis of the drive shaft 5 is the axis C1 of the crankshaft 6. core,
The axis 401 of the supplying pump 4 and the axis C2 of the water pump 2 are parallel. The drive shaft 5 is provided with two drive gears 501 and 502, and a driven gear 302 provided on the shaft 301 meshes with the drive gear 501, and in this embodiment, scavenging is performed on the left side of the drive shaft 5. A pump 3 is formed, a driven gear 402 provided on a shaft 401 meshes with a drive gear 502, and a supplying pump 4 is formed on the right side of the drive shaft 5 in this embodiment. And crank sprocket 7, water pump sprocket 8
And the oil pump drive sprocket 9 has a chain
It is multiplied by 10.

As shown in FIG. 3, a lubricating oil removing passage 101 is formed around the crank chamber 1. In this embodiment, the crank chamber 1 is the crank chamber main body 104 and the intermediate block 1
It is divided into three parts, 05 and scavenging pump case 106. Then, the lubricating oil that has flowed down into the crank chamber 1 is rotated by the crankshaft 6 and the lubricating oil removal passage 101
Communication holes 102 and 103 are opened in the rotation direction of the crankshaft 6 (arrow direction) so that the crankshaft 6 is discharged.

A discharge hole 303 is provided at the bottom of the scavenging pump case 106, and the scavenging pump 3 is directly attached to the discharge hole 303. This allows
The lubricating oil sucked by the scavenging pump 3 is
From the top to the bottom, as shown by the arrow, it flows out to the discharge passage 304. Further, the crank chamber 1 is divided into three, the inner wall 107 is integrally provided inside the crank chamber main body 104, and the inner wall 108 having the communication holes 102 and 103 is integrally provided inside the intermediate block 105. By providing the inner wall 109 inside the 106, the crank chamber 1 can be easily processed by casting or the like. FIG. 4 shows the supplying pump 4, in which the lubricating oil flows from the suction passage 403 to the discharge passage 404 so that it flows from the lower side to the upper side, which is opposite to the flow direction of the scavenging pump 3 as shown by the arrow. It has become.

FIG. 5 is a diagram showing a dry sump type lubrication path according to this embodiment. Fresh air passing through the air cleaner 11 and the air flow meter 12 is a throttle valve.
It is supplied to the engine 13 after the flow rate is adjusted (air-fuel ratio) in 15. On the other hand, the lubricating oil flows down into the crank chamber 1 together with the blow-by gas coming out of the engine 13, and the lubricating oil mixed with the flow-down blow-by gas is sucked by the scavenging pump 3 and transferred to the tank 14 and the tank 14 Within
Bygas and lubricating oil are separated. Then, the blow-by gas thus separated is circulated from the blow-by gas outlet nozzle 16 to the upstream side of the throttle valve 15, and the engine 13 again.
The separated lubricating oil is sucked from the lubricating oil outlet nozzle 17 by the supplying pump 4 and supplied to the lubricating system of the engine 13 to form a dry sump type lubricating system.

Next, the operation of this embodiment will be described.
As shown in FIG. 1, by providing the scavenging pump 3 and the supplying pump 4 directly below the crank chamber 1, the installation space for the water pump 2 can be secured in the lower portion of the crank chamber 1, and the crank Room 1
The scavenging pump 3 directly supplies the lubricating oil that has flowed down.
The oil tank 1 may not be provided below the crank chamber 1 by sucking out the oil. A portion (a) shown by a dotted line in FIG. 1 shows a shape in which an oil tank is provided in the lower portion of the crank chamber 1, and the overall height of the engine including the crank chamber 1 can be reduced.

Further, as shown in FIG. 2, the crankshaft 6
By providing the axis C2 of the water pump 2, the axis of the drive shaft 5, the axis of the axis 301 of the scavenging pump 3 and the axis of the axis 401 of the supplying pump 4 in parallel with the axis C1 of , The crank sprocket 7, the water pump drive sprocket 8 and the drive sprocket 9 for the scavenging pump 3 and the supplying pump 4 can be arranged in the same plane. This allows
With one chain (or belt) 10, the crank pulley 7 can drive the water pump 2, the scavenging pump 3, and the supplying pump 4.

Further, driven gears 302 and 402 meshing with drive gears 501 and 502 provided on the drive shaft 5 are provided on both sides of one drive shaft 5 to form a scavenging pump 3 and a supplying pump 4. Therefore, as shown in FIG. 3, the lubricating oil flow of the scavenging pump 3 flows from top to bottom, and as shown in FIG. 4, in the supplying pump 4, the lubricating oil flow flows from bottom to top. As a result, as shown in FIG. 5, the scavenging pump 3 sucks the lubricating oil in the crank chamber 1 and transfers the lubricating oil into the tank 14, and the lubricating oil in the tank 14 is sucked by the supplying pump 4. Then, a path for supplying lubricating oil to the lubricating system of the engine is configured so that it does not come out downward in the vicinity of the crank chamber 1 as shown in FIG. It becomes possible to make a route.

Further, by arranging the water pump 2, the scavenging pump 3, and the supplying pump 4 in parallel in the horizontal direction, the lower part of the crank chamber 1 can be made substantially flat, and the overall height of the engine can be lowered. At the same time, it is possible to reduce the damage by avoiding the collision during traveling by eliminating the protruding portion.

Then, as shown in FIG. 3, the crank chamber 1
A lubricating oil drain passage 101 is formed around and at the bottom of the crank chamber, communication holes 102 and 103 are opened at the bottom of the crank chamber 1, and a scavenging pump 3 is attached to a discharge hole 303 provided at the bottom of the passage. The lubricating oil flows down through the lubricating oil drop passage 101, the amount of lubricating oil flowing into the crank chamber 1 is reduced, the amount of lubricating oil stirred by the crankshaft 6 is reduced, and the stirring resistance of the lubricating oil is reduced. Wasted energy consumption is reduced and deterioration of the lubricating oil is reduced. Further, by providing the communication holes 102 and 103 in the rotation direction of the crankshaft 6 (the direction of the arrow in FIG. 3), the lubricating oil that has flowed down into the crank chamber 1 flows to the lubricating oil as if it is scraped off by the crankshaft 6. Is generated and is allowed to flow out to the lubricating oil removal passage 101. As a result, the agitation of the lubricating oil by the crankshaft 6 can be reduced, and wasteful energy consumption and deterioration of the lubricating oil due to the agitation of the crankshaft 6 can be reduced.

Further, since the lubricating oil that has flowed down into the crank chamber 1 flows out from the communication holes 102 and 103 into the lubricating oil removal passage 101, it does not collect at the bottom of the crank chamber 1 and the lubricating oil by the crankshaft 6 is thereby prevented. Stirring is eliminated, stirring resistance of the lubricating oil is reduced, useless energy consumption is reduced, and deterioration of the lubricating oil is reduced. The scavenging pump 3 sucks the lubricating oil in the lubricating oil removal passage 101 without forming a lubricating oil reservoir at the bottom of the crank chamber 1, so that the blow-by gas is also positively sucked and lubricated. The blow-by gas does not stay in the oil drop passage 101 and the crank chamber 1, the corrosion of the engine is reduced, and the deterioration of the lubricating oil can be reduced. Therefore, a lubricating system utilizing the advantages of the dry sump system can be obtained. Can be formed.

[0027]

As described in detail above, according to the present invention, which can be understood from the detailed description of the invention based on the description of claim 1, a scavenging pump and a supplying pump are provided immediately below a crank chamber, Since the installation space for the water pump can be secured in the lower part of the crank chamber and no oil tank is installed in the lower part of the crank chamber, the crank chamber can be downsized and the total height of the engine can be lowered. In addition, the water pump, scavenging pump, and supplying pump were installed using the lower part of the crank chamber, so these devices can be compactly packed and the degree of freedom in arranging other accessories can be increased. be able to.

A water pump, a scavenging pump driven coaxially, and a supplying pump are provided in parallel to the axial direction of the crankshaft, and the chain pulley is driven by a single chain or belt. Therefore, the drive mechanism can be simplified.

According to the present invention, which is understood from the detailed description of the invention based on the second aspect, the driven gear meshed with the drive gears provided on both sides of one drive shaft. Since a gear is provided and the flow direction of the lubricating oil of the scavenging pump and the flow of the lubricating oil of the supplying pump are reversed, the lubricating oil circulation circuit as a dry sump system can be compactly assembled.

According to the present invention, which can be understood from the detailed description of the invention based on the third aspect, a lubricating oil removing passage is formed around and at the bottom of the crank chamber and communicates with the bottom of the crank chamber. Open the hole, attach a scavenging pump to the communication hole provided at the bottom of the passage, and avoid the formation of a lubricating oil sump at the bottom of the crank chamber, so that a dry sump lubrication path is formed. At the same time, there is no agitation of the lubricating oil by the crankshaft, it is possible to reduce the waste of power, reduce the deterioration of the lubricating oil, further reduce the corrosion of the engine, and by adopting the dry sump system, The consumption can be reduced.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of the present invention in a partially longitudinal section.

FIG. 2 is a cross-sectional view taken along line AA of FIG.

FIG. 3 is a vertical cross-sectional view showing a part of the scavenging pump of FIG.

FIG. 4 is a vertical sectional view showing a part of the supplying pump of FIG.

5 is a diagram showing a dry sump type lubrication path to which the embodiment shown in FIG. 1 is applied.

[Description of sign]

 1 Crank chamber 101 Lubricating oil drain passage 102 Communication hole 103 Communication hole 104 Crank chamber body 105 Middle block 106 Scavenging case 107 Inner wall 108 Inner wall 109 Inner wall 2 Water pump 3 Scavenging pump 301 Shaft 302 Driven gear 303 Suction port 304 Discharge path 4 Supplying pump 401 Shaft 402 Driven gear 403 Suction path 404 Discharge path 5 Drive shaft 501 Drive gear 502 Drive gear 6 Crank shaft 7 Crank pulley 8 Water pump pulley 9 Oil pump drive pulley 10 Chain (belt)

Claims (3)

[Claims] 1. A water pump is provided directly below the crank chamber and parallel to the axial direction of the crankshaft, and a supplying pump and a scavenging pump driven by the same rotary shaft are provided beside the water pump. A lubrication device for an internal combustion engine, comprising a crank pulley, a water pump pulley, and pulleys provided on drive shafts of a supplying pump and a scavenging pump, which are chained or belted. 2. A single drive shaft is provided with two drive gears,
2. The lubricating device for an internal combustion engine according to claim 1, wherein driven gears that mesh with the drive gears are provided on both sides of the drive shaft to form a supplying pump and a scavenging pump. 3. A lubricating oil drop passage is formed around and at the bottom of the crank chamber, a communication hole communicating with the passage is provided at the bottom of the crank chamber, and a lubricating oil discharge hole is provided at the bottom of the passage to provide the lubrication of the passage. The lubricating device for an internal combustion engine according to claim 1 or 2, wherein a scavenging pump is attached to the oil discharge hole.