JPH0396610A - Oil tank for dry sump - Google Patents

Abstract

PURPOSE:To completely separate air from oil by centrifugally separate air within oil, joining oil with air excluded with oil in a tank in a state that swirl flow is suspended, and thereby concurrently sucking oil out with air mixing prevented. CONSTITUTION:Oil is led to a cyclone type separator 9 arranged on the upper section of an oil tank main body 8 so that air is removed by means of a centrifugal separating method. Then, air free oil is joined with an oil level 18 from the lower end 9a of the separator set beneath the oil level 18 with no scattering into a space. In this case, swirl flow liable to be generated at the upper layer section of stored oil is prevented by a radially shaped vertical baffle 12. This can thereby prevent the core of air bubbles from being formed at the center of swirl flow. On the other hand, oil is sucked out of an oil suction port 14 at the bottom of the oil tank main body 8. In this case, a disc type horizontal baffle 13 prevents air from being mixed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a dry sump oil tank used in an internal combustion engine employing a dry sump system.

Conventional technology In recent years, engines have become larger in displacement. With the increase in the number of cylinders, it has become essential for in-vehicle engines to be more compact, and as the overall height of the engine also tends to decrease, it is necessary to downsize the oil pan. On the other hand, as speeds increase, in order to prevent deterioration in the performance of removing engine oil from the cylinder head due to an increase in blow-by gas at high speeds, and to prevent poor lubrication due to air suction from the oil pump when the vehicle turns, it is necessary to drain the return oil into the cylinder head. A dry sump method has been proposed in which the oil is pumped up using a scavenging bomb and stored in a separate oil tank instead of being stored inside the tank.

An example of a conventional internal combustion engine employing such a dry sump system is the one shown in FIG. 2 (see, for example, Japanese Utility Model Application Publication No. 171808/1983).

That is, the returned oil is not stored in the oil pan 1, but is pumped up by the scavenging pump 2, stored in a separately provided oil tank 3, and the oil in the oil tank 3 is sent to the engine body using a pressure bomb 4 via an oil filter 5. 6 for lubrication. Note that 7 in the figure is a turbocharger.

Problems to be Solved by the Invention However, in such a conventional dry sump system, a large amount of air gets mixed in when the scavenging pump 2 pumps the oil into the oil tank.

Therefore, oil and air are separated using an oil filter or the like, but this alone is not perfect and has the problem of easily causing poor lubrication.

The present invention has been made in view of these conventional problems, and its purpose is to provide an oil tank that can reliably separate oil and air. .

Means for Solving the Problems Therefore, the present invention provides a centrifugal separator installed at the top of a tank, an oil inlet from a scavenging bomb that opens at the top of the separator, and a pressure balance hole drilled in the separator. A radial vertical baffle was placed below the separator, a disc-shaped horizontal baffle was placed below the vertical baffle, and an oil suction port for the pressure pump opened at the bottom of the tank.

Air in the oil pumped from the working scavenging bomb is removed by centrifugation within the separator.

The oil from which the air has been removed joins with the oil in the oil tank and tries to swirl, but the swirling flow is stopped by the radial vertical baffle, thereby preventing the formation of a bubble core in the center.

Furthermore, the disk-shaped horizontal baffle prevents air from being mixed in due to oil being sucked in from the outlet by the pressure pump.

In this way, oil and air are completely separated.

EXAMPLES The present invention will be explained below based on the drawings. FIG. 1 is a diagram showing an embodiment of the present invention.

First, the configuration will be explained. A centrifugal cyclone separator 9 is installed at the top of the oil tank body 8 to separate air mixed in the oil.

The separator 9 is provided with an oil inlet 10 in its upper part for introducing oil under pressure from a scavenging pump into the separator 9, and is also provided with a balance hole 11 for balancing the pressure inside and outside the separator 9. . The separator 9 is provided with a separate air outlet 15 and a blow pie inlet i6.

Furthermore, a radial vertical baffle l2 made of flat plates assembled radially is arranged below the separator 9, and a disc-shaped horizontal baffle l3 is further arranged below the radial vertical baffle 12. An oil suction port 14 to the pressure pump is provided at the bottom of the tank body 8.

In the figure, 9 is an oil filler cap, and 17 is a level gauge.

Next, the effect will be explained. The oil pressure-fed from the scavenging pump is guided to a cyclone separator 9 disposed above the oil tank body 8, rotates as shown by the arrow in the figure, and removes air by centrifugal separation.

The oil from which air has been removed is at the oil level at the lower end 9a of the separator! Since the oil level l8 is set to be lower than 8, the oil level l8 merges without being scattered in space.

Due to this merging, the swirling flow that is about to occur in the upper layer of the oil stored in the tank 8 is stopped by the radial vertical baffle l2. This prevents the formation of a bubble core at the center of the swirling flow.

In addition, an oil suction port I provided at the bottom of the oil tank body 8
Mixing of air generated by suction when oil is sucked out from 4 and pumped into the engine body by a pressure pump is prevented by a disk-shaped horizontal baffle 13 provided above the suction port 14.

In this way, oil and air are completely separated, and the engine body can be reliably lubricated.

Effects of the Invention Since the structure is as described above, according to the present invention, oil and air can be completely separated and the engine can be lubricated reliably.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention, and FIG. 2 is an oil circulation system diagram of an internal combustion engine employing a conventional dry sump system. 8...Oil tank body, 9...Separator, 10
...Oil inlet, 1l...Balance hole, l2...
・Vertical 7 kuffle, l3...Horizontal buffle, 14...
Oil suction port, I5...Air discharge port, 18...Curved surface.

Claims (1)

[Claims] (1) A centrifugal separator placed at the top of the tank, an oil inlet opening at the top of the separator, a pressure balance hole drilled in the separator, and a radial vertical baffle placed below the separator. An oil tank for a dry sump, characterized in that it has a disc-shaped horizontal baffle arranged below a vertical baffle, and an oil suction port opening at the bottom of the tank.