JPS6215733B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an oil cooler for an internal combustion engine, in particular, an oil cooler is configured by combining a plurality of single-tube heat exchangers, and the cooling water passage pipes of each single-tube heat exchanger are used to cool the engine. It is used as water system piping, and by opening the oil inlet and outlet of the connected heat exchanger on the same side of the engine, the cooling water piping and lubricating oil piping are simplified.

Internal combustion engines such as diesel engines usually have a heat exchanger, a so-called oil, that cools the lubricating oil by exchanging heat with seawater or fresh water cooling water, in order to prevent seizure and wear of metal parts due to overheating of the lubricating oil. A cooler is attached. By the way, this type of conventional oil cooler for internal combustion engines is generally a so-called shell-and-tube type multi-tube heat exchanger in which multiple tubes through which oil flows are inserted into an outer shell through which cooling water flows. A cooling water inlet and outlet provided in the outer shell body is connected to cooling water system equipment such as a fresh water cooler and a cooling water pump via piping, and an oil inlet and outlet provided at the end of the tube is used for lubrication. It is connected to an oil filter, oil pump, or main gear via oil piping to exchange heat between lubricating oil and cooling water.

However, such conventional oil coolers for internal combustion engines have a relatively large volume and weight, so they are installed in the lower space of the exhaust manifold, where there is sufficient space and it is easy to install them to the cylinder block, etc. However, since the inlets of the lubricant oil supply system's lubricant oil strainer and main oil gear rally are provided on the opposite side of the exhaust manifold, that is, on the engine control side, the oil cooler, the lubricant oil strainer, and the oil pump are located on the opposite side of the exhaust manifold. Not only is a long oil pipe that largely bypasses the cylinder block required as a connection piping between the lubricating oil supply system equipment including the Dedicated piping is required to connect the pipes, and the cooling water piping, lubricating oil piping, and support structure for each piping become extremely complicated.
This resulted in problems such as an increase in overall weight and number of parts, as well as a rise in engine manufacturing costs.

The present invention focuses on the problems that conventional oil coolers for internal combustion engines have, and constructs an oil cooler by combining a plurality of single-tube heat exchangers, and the oil passage of each single-tube heat exchanger is The terminal entrances and exits of the connected passages are opened on the same side of the engine,
In addition to shortening the piping route for lubricating oil supply system equipment such as lubricating oil strainers, cooling water passages formed by connecting the cooling water conduction pipes of each single-pipe oil cooler can be used to This system aims to solve the above problem by eliminating the dedicated cooling water piping, and its characteristic configuration is a single pipe with a spiral oil passage formed on the outer circumference of the cooling water conduit. A plurality of heat exchangers are combined, and the respective conduction pipes of the heat exchangers are connected in series and installed in the upper space of the flywheel housing of the internal combustion engine, and the connected cooling water conduction pipes are connected to the engine cooling water system. Further, the spiral oil passages of the heat exchanger are connected in series with each other, and the terminal oil inlets and outlets thereof are opened on the same side of the internal combustion engine.

The present invention will now be described in detail with reference to embodiments shown in the accompanying drawings.

Fig. 1 is a schematic diagram of a small marine diesel engine to which the oil cooler of the present invention is applied, seen from the stern side, Fig. 2 is a schematic diagram of the engine seen from the steering side, and Fig. 3 is a portion of the oil cooler of the present invention. FIG.

In each of these figures, 1 is a cylinder block of the engine E, 2 is a flywheel housing attached to the rear of the cylinder block 1, 3 is a reduction/reversing gear connected to the flywheel housing 2, and 4 is the cylinder block 1. a cylinder head 5 fixed to the upper part of the cylinder head 4;
An exhaust manifold fixed to one side, 6 is a turbocharger attached to the rear of the cylinder head 4, and the turbocharger 6 connects an exhaust turbine 7 connected to the exhaust outlet 5a of the exhaust manifold 5, and the exhaust turbine. 7, and an air purifier 9 attached to the intake port 8a of the blower 8. The provided blower blades are rotated to compress the air taken in from the air intake port 10 of the air purifier 9, and send it through the air supply pipe 11 to the intake manifold 12 attached to the other side of the cylinder head 4. It's becoming like that.

The engine E having the above structure has an oil cooler 13, which is a main part of the present invention, installed in the space above the flywheel housing 2, that is, in the gap between the rear surface of the cylinder head 4 and the turbocharger 6.

As shown in FIG. 3, the oil cooler 13 is constructed by covering the outer periphery of a straight cooling water conduit 15 with a spiral protrusion 14 formed on its outer peripheral surface with an outer tube 16, and connecting the outer tube 16 and the cooling water conduit 15 to each other. Oil passage 17 at intervals
Two single-tube heat exchangers 18, 18' are arranged in a V-shape, and the mantle tubes 16, 16' are connected by a stay 19 and a connecting pipe 20. The cooling water outlet 21 and the cooling water inlet 22 of the heat exchanger 18' are connected to each other by a rubber hose 23 and fixed horizontally, and the cooling water inlet 24 of the lower horizontal heat exchanger 18 is connected to the rubber hose 25. The cooling water outlet 28 of the upper heat exchanger 18' is connected via a hose 29 to the seawater inlet of a fresh water cooler 30 mounted on the upper part of the exhaust manifold 5. 31.

In addition, pipe joints 34 and 35 can be connected to the end of each heat exchanger 18 and 18' on the engine operation side, respectively, to be connected to a lubricating oil pump and a lubricating oil compressor (not shown) via oil pipes 32 and 33. An oil inlet 36 and an oil outlet 37 are open.

The oil cooler of the present invention has the above-mentioned configuration.Next, its operation will be explained. First, when the engine is operating, the seawater pump 26 is driven, and seawater is discharged from the outlet 27 of the seawater pump 26. Then, the seawater is led into the cooling water conduit 15 from the cooling water inlet 24 of the horizontal heat exchanger 18 through the rubber hose 25, exits from the cooling water outlet 21, and passes through the rubber hose 23 to the upper heat exchanger 18. The water enters the cooling water inlet 2 of the heat exchanger 18', passes through the cooling water conduit pipe 15' of the heat exchanger 18', and is pumped from the cooling water outlet 28 through the rubber hose 28 to the fresh water cooler 30. At this time, the lubricating oil pumped from the oil pan by the oil pump passes through a lubricating oil strainer (not shown) and then passes through the oil pipe 32 and the pipe joint 34 to the oil inlet 36 of the heat exchanger 18 located below. The oil enters the oil passage 17 from the cooling water passage 17 and flows spirally around the cooling water passage pipe 15.
After exchanging heat with the seawater through the pipe wall of No. 5 and releasing heat to the seawater, it enters the oil passage 17' of the upper heat exchanger 18 through the connecting pipe 20, where it releases heat to the seawater again and is cooled. The oil is supplied from the oil outlet 37 via the pipe joint 35 and the oil pipe 33 to the main oil gear gallery provided in the cylinder block 1.

In the above embodiment, an oil cooler is constructed by combining two single-tube heat exchangers in a V shape, but the structure of the oil cooler of the present invention is such that each heat exchanger is If the water conduit pipe can be used as a cooling water pipe, and the terminal entrance/exit of a series of oil passages formed by connecting the oil passages of each heat exchanger opens on the same side of the engine, the above structure is applicable. For example, but not limited to,
As shown in Figure 4, single tube heat exchangers 18, 18', 1
8'', 18 are arranged in parallel, and the cooling water inlets and outlets of each heat exchanger are connected in series with each other with a rubber hose 23 to form a series of cooling water passages, and the oil passage of each heat exchanger is connected with a pipe 20. It goes without saying that various design modifications can be made, such as connecting the oil passages to form a series of oil passages and opening the oil inlets and outlets 36 and 37 of the oil passages on the same side of the engine.

As described above, the oil cooler of the present invention connects the cooling water passage pipes of a plurality of single-tube heat exchangers in series to form a series of cooling water passages, and the equipment of the cooling water system is connected by the passages. At the same time, the oil passages of each single-tube heat exchanger are connected in series to form a series of oil passages, and the entire oil cooler is connected to the engine so that the end ports of the oil passages open on the same side of the engine. Since the oil inlet/outlet is attached to the upper part of the flywheel housing of the engine, the oil inlet/outlet is close to the lubricating oil supply system equipment on the engine control side, the length of the lubricating oil piping is shortened, and each single-tube heat exchanger is It also serves as a part of the cooling water piping and has the excellent effect of shortening the cooling water piping. Moreover, according to the present invention, by changing the combination shape of the single-tube heat exchanger, it is possible to easily configure an oil cooler with a shape that matches the dead space around the engine. Since it can be stored in a narrow space such as the gap between the engine and the turbocharger, it is expected that the space around the engine can be used effectively and the engine can be made more compact.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of a small boat diesel engine to which the oil cooler of the present invention is applied, as seen from the stern side, Fig. 2 is a side view of the same engine, Fig. 3 is a partial sectional view of the oil cooler of the present invention, and Fig. 4 The figure is a schematic diagram showing another embodiment of the oil cooler of the present invention. 2... Flywheel housing, E... Internal combustion engine (engine), 15, 15'... Cooling water conduit pipe, 17, 17'... Oil passage, 18, 18',
18″, 18...single tube heat exchanger, 36...oil inlet, 37...oil outlet.

Claims (1)

[Claims] 1 A flywheel housing of an internal combustion engine is constructed by combining a plurality of single-tube heat exchangers each having a spiral oil passage formed on the outer periphery of a cooling water conduit, and connecting the conduit tubes of the heat exchangers in series. At the same time, the connected cooling water conduit pipes are used as piping for the engine cooling water system, and the spiral oil passages of each heat exchanger are connected in series, and the terminal oil inlet and outlet are connected to the internal combustion engine. An oil cooler for an internal combustion engine, characterized in that the oil cooler is opened on the same side of the engine.