JPH0830404B2 - Lubricating device for V-type internal combustion engine - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a V-type internal combustion engine lubrication device in which a V-type internal combustion engine mounted on an automobile, a motorcycle or the like is provided with a dry sump type lubrication system. is there.

(Prior Art) Conventionally, in a so-called dry sump type, an oil tank for storing lubricating oil (oil) in an internal combustion engine is generally provided at a position apart from the engine body,
Lubricating oil is circulated to and from the engine. By the way, immediately after the engine cold start, the temperature of the lubricating oil is low,
Since the viscosity is high, the frictional resistance of the sliding part in the engine becomes large, and it is difficult to maintain stable rotation of the engine.

Therefore, it is necessary to raise the temperature of the lubricating oil to a normal operating state in a short time. Immediately after the cold engine is started, the temperature of the cooling water in the water jacket around the cylinder of the engine rises the fastest, so it is conceivable to heat-exchange the cooling water and the oil whose temperature has risen.

On the other hand, after the engine is warmed up, it is necessary to reduce the temperature of the lubricating oil during high load operation. By the way, the circulating cooling water is cooled by a radiator separate from the engine, and the inlet of this cooled water is located in the water jacket around the cylinder. It is effective to lower the temperature of the lubricating oil by utilizing the temperature difference.

By the way, as shown in Japanese Utility Model Publication No. 55-16093, a cooling pipe in which cooling water is circulated is arranged in an oil tank to cause heat exchange between the lubricating oil and the cooling water, and the viscosity of the lubricating oil. There is one that tries to maintain the stable rotation of the engine by preventing the decrease of. That is, the device disclosed in this publication stores lubricating oil in an oil tank (oil tank) attached to the lower portion of the crank chamber of an automobile engine, and provides a cooling pipe in this oil tank.

However, when the temperature of the lubricating oil is increased immediately after the cold start of the engine, the temperature of the cooling water immediately becomes the highest in the water jacket provided on the cylinder wall in the engine, whereas in the above publication. In this device, the temperature of the lubricating oil in the oil tank is raised by the cooling water that passes through the cooling pipe liquid that is lower in temperature than the cooling water that passes through the water jacket. It is inferior in heat resistance.

Further, in the case of the wet sump type in which the oil tank is attached to the lower part of the crankcase of the engine like the device shown in the above publication, the mounting position of the engine is upward, especially in motorcycles, It has the drawback of having a high center of gravity or a low ground clearance. On the other hand, if the so-called dry sump type is adopted in which only an oil receiver (small-capacity oil pan) is provided under the crankcase of the engine and an oil tank for storing lubricating oil is provided separately, the center of gravity of the engine will be lowered. In addition, it is advantageous from the viewpoint of securing a sufficient minimum ground clearance, but it requires an extra space for installing the oil tank, and a passage and oil for collecting the lubricating oil from the lower part of the crankcase to the oil tank. There is a problem that the passage for sending the lubricating oil from the tank to each part of the engine becomes long.

(Object of the Invention) The present invention has been made in view of the above conventional problems,
Immediately after the engine is started cold, the temperature of the lubricating oil is quickly raised to reduce its viscosity, and after the engine is warmed up, the temperature of the lubricating oil is lowered to an appropriate temperature during high load operation, so that the engine rotation is improved. An object of the present invention is to provide a lubrication device for a V-type internal combustion engine that is stable and does not require an extra space for installing an oil tank while making the lubrication system a dry sump type, and that can configure the lubrication system compactly. To do.

(Structure of the Invention) According to the present invention, a cylinder block having a water jacket that surrounds the circumference of a cylinder and circulates cooling water is arranged in a V shape, and has an upward V space in the center upper part of the cylinder block and in the lower part of the cylinder block. A lubrication device for a V-type internal combustion engine, wherein a V-type internal combustion engine having a crankcase is provided with a dry sump type lubrication system, which comprises a volume portion formed in the V space of the cylinder block and a cover covering the volume portion. In addition to configuring an oil tank for storing lubricating oil, an oil pipe for recovering lubricating oil that opens above the oil level in the oil tank, and lubricating oil sucked from the lower part of the crankcase is passed through the oil pipe into the oil tank. A collection oil pump for collection and a lower part of the above oil tank are connected via passages to lubricate various parts of the engine. And a supply oil pump for supplying oil.

With this configuration, in the tri-sump type lubrication system,
The heat exchange between the cooling water in the water jacket and the lubricating oil stored in the oil tank is carried out efficiently, the rotation of the internal combustion engine is maintained stable, the space for arranging the oil tank can be reduced, and the lubricating oil It is possible to shorten the passage for collecting and supplying.

(Embodiment) FIG. 1 and FIG. 2 are configuration diagrams of a V-type internal combustion engine according to an embodiment of the present invention. First, in FIG. 1, an engine (V-type internal combustion engine) 1 has a pair of cylinder blocks 2 arranged in a V shape, a cylinder head 2a, a pair of cam cases 3, and a crankcase 4. As shown in the figure, the V space at the upper center of the cylinder block 2 faces upward, and the crankcase 4 is located below the cylinder block 2 and is mounted on an automobile or a motorcycle. The engine 1 further includes a small-capacity oil pan 5 as an oil receiver provided below the crankcase 4, and an oil tank 6 provided in the V space of the cylinder block 2 which is a feature of the present invention. ing.

In the cylinder block 2, 7 is a cylinder, 7a
Is a piston, 8 is a water jacket provided in the wall of the cylinder block 2 for circulating cooling water, 9 is a water jacket provided in the cylinder head 2a, 10 is a combustion chamber, 11
Is an intake valve and 12 is an exhaust valve. In the cam case 3,
13 is a valve cam that opens and closes the intake valve 11, 14 is an exhaust valve 12
This is a valve operating cam for opening and closing.

In the crankcase 4, 15 is a crank shaft, 16 is a connecting rod, 17 is a connecting rod cap, 18 is a crank web that balances the rotational direction of the crank shaft, and 19 (19a, 19a
b) is an oil pump. The oil pump 19 collects the lubricating oil in the oil tank 6 so as to collect the lubricating oil.
and a supply oil pump 19b for supplying lubricating oil from the oil tank 6 to each part of the engine.

The oil pan 5 is provided below the crankcase 4,
It has an oil strainer 20.

The oil tank 6 includes an inner portion 22 of the V space in which the outer surface of the cylinder block 2 including the water jacket 8 faces through the heat radiating member 21, and covers 25 and 25a that cover a volume portion 24 formed by the cross member 23. , The oil filler cap 26 that is removed when the lubricating oil is filled in the volume 24
And an oil passage window 27 through which the lubricating oil is provided, which is provided in the partition wall 26a. The heat dissipation member 21 is provided to increase the transfer area of heat exchange between the lubricating oil in the oil tank 6 and the cooling liquid in the water jacket 8. Reference numeral 28 denotes an oil pipe that connects the discharge port of the recovery oil pump 19a and the inside of the oil tank 6 and discharges the lubricating oil containing bubbles into the oil tank 6, and is opened above the oil level in the oil tank 6. ing. Separation of the bubbles is more effective when a large number of partition walls 26a that function as baffle plates are provided in the oil tank 6. Reference numeral 29 is an oil pipe that connects the inside of the oil pan 5 and the suction port of the recovery oil pump 19a.

In FIG. 2, 30 is a flywheel housing, 31
Is a flywheel, 32 is an oil seal, 33 is a bearing, 34
a, 34b are timing belts for driving the valve operating cams 13, 14 shown in FIG. 1, 35 is a sprocket for the timing belts 34a, 34b, 36 is a timing belt cover, 37 is an oil strainer, and 38 is an oil gallery inlet. is there.

Next, the circulation route of the lubricating oil in the above embodiment will be described. First, the oil pump for collecting the lubricating oil in the oil pan 5 through the oil strainer 20 and the oil pipe 29.
It is sucked at 19a and is further pressure-fed (or collected) into the oil tank 6 through the oil pipe 28. The lubricating oil recovered in the oil tank 6 is filtered through the oil strainer 37 by the supply oil pump 19b provided coaxially with the recovery oil pump 19a, and the supply oil pump 19b is supplied.
After passing through the oil gallery 27a, it is pressure-fed to the oil gallery 27a from the oil gallery inlet 38 through an oil filter (not shown), and is supplied to each part of the engine 1. That is, part of the lubricating oil from the oil gallery 27a circulates and lubricates the bearing 33 of the crankshaft 15, the inside of the crankshaft 15 and the bearing of the connecting rod 16 and returns to the oil pan 5, and part of the lubricating oil. 2a, the cam bearing, and the tappet are circulated and lubricated and returned to the oil pan 5, and part of them is injected from an oil jet (not shown) that cools the lower part of the piston 7a and returned to the oil pan 5.

The oil tank 6, a small-capacity oil pan 5 as an oil receiver, oil pipes 28, 29, and a recovery oil pump 1
A dry sump type lubricating system is constituted by 9a, the supply oil pump 19b, and the like, and in this lubricating system, most of the lubricating oil is stored in the oil tank 6.

Next, the circulation path of the cooling water will be described. Immediately after the cold start of the engine 1, the cooling water in the water jacket 8 around the cylinder 7 immediately rises in temperature, and the circulation path includes a cylinder head 2a, a thermostat (not shown), and a radiator bypass pipe (not shown). ), A water pump (not shown), and a water jacket 8.

On the other hand, during warm-up and high-load operation of the engine 1, the cooling water in the water jacket 8 has the lowest temperature inside the engine 1, and the circulation path includes the cylinder head 2a, the thermostat, the radiator, the water pump, and the water jacket. It becomes 8.

By circulating the lubricating oil and the cooling water in this way,
Immediately after the engine 1 is started, the high heat of the water jacket 8 is transferred to the lubricating oil in the oil tank 6, thereby warming the lubricating oil. Therefore, the viscosity of the lubricating oil is reduced and the rotation of the engine 1 is stabilized. Further, during high-load operation of the engine 1, the heat of the lubricating oil in the oil tank 6 is transferred to the cooling liquid in the water jacket 8, which can prevent the lubricating oil from reaching a high temperature. The rotation is stabilized. However, since the temperature of the lubricating oil is lower than the temperature of the wall around the combustion chamber 10, the cooling effect of the cooling water is not hindered.

Further, most of the lubricating oil stays in the oil tank 6, while most of the cooling water flows through the water jacket 8. Therefore, the heat capacity between the oil tank 6 and the water jacket 8 is increased, heat exchange is effectively performed, and the lubricating oil and the cooling liquid can be temperature-homogenized.

Further, by providing the oil tank 6 in the V-shaped space as in the present invention, the heat transfer area can be increased (for example, doubled) as compared with the case where it is provided in another place.

The flow velocity of the lubricating oil circulating in the oil tank 6 is slower than the flow velocity of the cooling water, and the heat transfer amount of the lubricating oil per unit area is smaller than that of the cooling water. Therefore, in order to balance these heat transfer amounts, The area of the heat dissipation member 21 is increased. The fins serving as the heat radiating member 21 also serve to prevent ripples in the lubricating oil in the oil tank 6, and also serve as ribs that increase the strength of the outer wall of the cylinder block 2.

As shown in FIG. 1, the cover 25 covering the volume 24 is not limited to a part 25a which is integrally formed with the cylinder block 2 and a part 25 which is a separate body. It is conceivable that the block 2 is formed integrally with the block 2, or that the entire cover is separate from the cylinder block 2.

(Effects of the Invention) As described above, the present invention configures an oil tank with a volume portion formed in the V space of the cylinder block and a cover that covers the volume portion, and is located above the oil level in the oil tank. Opening oil pipe, recovery oil pump,
This is a dry sump type lubrication system that is equipped with a supply oil pump and the like, and the heat exchange is efficiently performed between the cooling water in the water jacket and the lubricating oil stored in the oil tank. Immediately after a cold start of the engine, the lubricating oil can be warmed by the heat of the cooling water and its viscosity can be lowered, which can contribute to the stabilization of the rotation of the internal combustion engine. Further, during warm-up and high-load operation, the temperature of the lubricating oil can be lowered by the cooling water, and therefore, the lubricating oil having an appropriate temperature can be circulated in the internal combustion engine to contribute to stable maintenance of rotation.

In particular, most of the oil is stored in the oil tank formed in the V space, and the long residence time of the oil ensures sufficient heat exchange with the cooling water. Since the heat exchange action is enhanced also by arranging the water jackets on both sides of the V space, the effect of adjusting the lubricating oil temperature as described above can be enhanced.

Further, while the dry sump type is advantageous for lowering the center of gravity of the engine and ensuring the minimum ground clearance, an oil tank for storing lubricating oil is formed in the V space of the cylinder block. In a motorcycle, etc., space is effectively used, so that an extra space is not required for installing an oil tank, and compared with the case where an oil tank is installed outside the engine, the oil tank and crankcase and Since the distance from the lubrication point of the engine becomes short, the passage of the lubricating oil can be shortened, and the lubricating system can be compactly equipped.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a V-type internal combustion engine provided with an oil tank of the present invention, and FIG. 2 is a vertical sectional view of the internal combustion engine. 1 ... Engine (V type internal combustion engine), 2 ... Cylinder block, 6 ... Oil tank, 7 ... Cylinder, 24 ... Volume part, 25
…cover.

Claims (1)

[Claims] 1. A cylinder block having a water jacket that surrounds a cylinder and circulates cooling water is arranged in a V shape, has an upward V space in the center upper part of the cylinder block, and has a crankcase in the lower part of the cylinder block. A lubricating device for a V-type internal combustion engine in which a dry-sump type lubricating system is provided in the V-type internal combustion engine, wherein a lubricating oil is stored in a volume portion formed in the V space of the cylinder block and a cover covering the volume portion. An oil pipe that constitutes an oil tank and that collects lubricating oil that opens above the oil level in the oil tank and that collects lubricating oil that has been sucked from the lower part of the crankcase into the oil tank through the oil pipe. An oil pump is connected to the lower part of the oil tank via a passage to supply lubricating oil to each part of the engine. Lubrication system for a V-type internal combustion engine, characterized in that a supply oil pump.