JP4323888B2 - Lubricating oil cooling system - Google Patents

Description

  The present invention relates to a configuration of a lubricating oil cooling device provided in a marine engine.

  2. Description of the Related Art Conventionally, an engine mounted on a ship or the like has been provided with a cooling device such as a fresh water cooler that cools cooling water that has cooled the engine body using seawater and an oil cooler that cools lubricating oil. As an oil cooler for cooling the lubricating oil, a seawater oil cooler constituted by a multi-tube type or a fresh water oil cooler constituted by a multi-plate type is used. In general, a seawater oil cooler is often provided, and the seawater oil cooler is provided with a large number of pipes in a cooling case, and between seawater flowing through these pipes and lubricating oil flowing in the cooling case. In this case, the lubricating oil is cooled by exchanging heat (see, for example, Patent Document 1).

JP 08-210133 A

  However, when a seawater oil cooler is used as an oil cooler, the lubricating oil is cooled with seawater at a low temperature, so the temperature of the lubricating oil does not rise easily at no load and low load, and it takes time to warm up. It took time to reach rated operation, and there were problems such as deterioration of fuel consumption due to mechanical loss. Moreover, when the fresh water oil cooler comprised by the multi-plate type was used, the pressure loss of lubricating oil became large on the structure. And in order to prevent this pressure loss, when the bypass valve was provided, the problem that the efficiency of a cooling device fell occurred. Furthermore, even when either a seawater oil cooler or a fresh water oil cooler is used, the engine has only one oil cooler, and thus tends to increase in size.

  The problems to be solved by the present invention are as described above. Next, means for solving the problems will be described.

In Claim 1, the fresh water cooler which cools the cooling water which cooled the engine main body with seawater, the fresh water oil cooler (2) which cools lubricating oil, and the sea water oil arrange | positioned in parallel with the said fresh water oil cooler (2) A marine engine provided with a cooler (3), wherein the fresh water oil cooler (2) and a seawater oil cooler (3) are connected to a discharge side of a lubricating oil pump (23), and the seawater oil cooler (3) A bypass valve (20) is connected in series to the inlet side of the water, the fresh water oil cooler (2) and the seawater oil cooler (3) merge at the outlet, and an oil filter (9) is connected to the outlet of the merged portion. In the connected lubricating oil cooling device, an oil passage case (8) is fixed to the side of the cooling case (6) constituting the fresh water oil cooler (2), and is attached to the side surface of the oil passage case (8). Mounting block An oil filter (9) is attached via (10), and a cooling water inlet (6a) and a cooling water outlet (6b) are provided on both sides in the longitudinal direction of the cooling case (6), respectively. A lubricating oil inlet (6c) is provided at the cooling water outlet (6b) side portion of (6), and a lubricating oil outlet (6d) is provided at the cooling water inlet (6a) side portion of the cooling case (6). The inlet (6c) is connected to a first outlet (8c) of an inlet oil passage (8a) formed on one side of the oil passage case (8), and the lubricating oil outlet (6d) is connected to the oil passage case. (8) Connected to the first inlet (8f) of the outlet oil passage (8b) formed on the other side, and the inlet (8d) of the inlet oil passage (8a) is the discharge port of the lubricating oil pump (23) And an outlet (8g) of the outlet oil passage (8b) is connected to an inlet-side oil passage (10a) of the oil filter (9). The mounting block (10) is formed with an inlet side oil passage (10a), an outlet side oil passage (10b), and a bypass oil passage (10c) of the oil filter (9). The passage (10a) is connected to the outlet oil passage (8b) via an outlet (8g), and the oil filter (9) communicates with the fresh water oil cooler (2). The outlet-side oil passage (10b) The oil filtered by the oil filter (9) is communicated so as to be sent to each part of the engine, and the bypass oil passage (10c) is configured with a bypass valve (20), and the seawater oil cooler (3) The lubricating oil inlet (13c) of the cooling case (13) that constitutes the communication is communicated with the secondary port (10d) of the bypass valve (20) disposed in the mounting block (10), and the oil passage case (8 ) Through the inlet oil passage (8a) 23), the lubricating oil outlet (13d) of the cooling case (13) communicates with the second inlet (8h) provided in the outlet oil passage (8b) of the oil passage case (8), and the outlet Connect to the oil filter (9) from the oil passage (8b) and cool only with a small capacity fresh water oil cooler (2) at low loads, and use a seawater oil cooler (3) at high loads to cool. It is composed .

The lubricating oil cooling device according to claim 1 , wherein the bypass valve (20) is a differential pressure type valve by a spring (21) and a valve body (22). It is a cooling device.

According to a third aspect of the present invention, in the lubricating oil cooling device according to the first aspect, when the bypass valve (20) is an electromagnetic valve, the solenoid of the electromagnetic valve and a temperature sensor are connected to a controller, and when the temperature becomes equal to or higher than a set temperature. The lubricating oil cooling device is characterized by being opened.

According to a fourth aspect of the present invention, in the lubricating oil cooling device according to the first aspect, when the bypass valve (20) is an electromagnetic valve, the solenoid of the electromagnetic valve and a pressure sensor are connected to a controller, and when the pressure exceeds a set pressure. The lubricating oil cooling device is characterized by being opened.

  As effects of the present invention, the following effects can be obtained.

In Claim 1, the fresh water cooler which cools the cooling water which cooled the engine main body with seawater, the fresh water oil cooler (2) which cools lubricating oil, and the sea water oil arrange | positioned in parallel with the said fresh water oil cooler (2) A marine engine provided with a cooler (3), wherein the fresh water oil cooler (2) and a seawater oil cooler (3) are connected to a discharge side of a lubricating oil pump (23), and the seawater oil cooler (3) A bypass valve (20) is connected in series to the inlet side of the water, the fresh water oil cooler (2) and the seawater oil cooler (3) merge at the outlet, and an oil filter (9) is connected to the outlet of the merged portion. In the connected lubricating oil cooling device, an oil passage case (8) is fixed to the side of the cooling case (6) constituting the fresh water oil cooler (2), and is attached to the side surface of the oil passage case (8). Mounting block An oil filter (9) is attached via (10), and a cooling water inlet (6a) and a cooling water outlet (6b) are provided on both sides in the longitudinal direction of the cooling case (6), respectively. A lubricating oil inlet (6c) is provided at the cooling water outlet (6b) side portion of (6), and a lubricating oil outlet (6d) is provided at the cooling water inlet (6a) side portion of the cooling case (6). The inlet (6c) is connected to a first outlet (8c) of an inlet oil passage (8a) formed on one side of the oil passage case (8), and the lubricating oil outlet (6d) is connected to the oil passage case. (8) Connected to the first inlet (8f) of the outlet oil passage (8b) formed on the other side, and the inlet (8d) of the inlet oil passage (8a) is the discharge port of the lubricating oil pump (23) And an outlet (8g) of the outlet oil passage (8b) is connected to an inlet-side oil passage (10a) of the oil filter (9). The mounting block (10) is formed with an inlet side oil passage (10a), an outlet side oil passage (10b), and a bypass oil passage (10c) of the oil filter (9). The passage (10a) is connected to the outlet oil passage (8b) via an outlet (8g), and the oil filter (9) communicates with the fresh water oil cooler (2). The outlet-side oil passage (10b) The oil filtered by the oil filter (9) is communicated so as to be sent to each part of the engine, and the bypass oil passage (10c) is configured with a bypass valve (20), and the seawater oil cooler (3) The lubricating oil inlet (13c) of the cooling case (13) that constitutes the communication is communicated with the secondary port (10d) of the bypass valve (20) disposed in the mounting block (10), and the oil passage case (8 ) Through the inlet oil passage (8a) 23), the lubricating oil outlet (13d) of the cooling case (13) communicates with the second inlet (8h) provided in the outlet oil passage (8b) of the oil passage case (8), and the outlet Connect to the oil filter (9) from the oil passage (8b) and cool only with a small capacity fresh water oil cooler (2) at low loads, and use a seawater oil cooler (3) at high loads to cool. Since it comprised, since a lubricating oil can be cooled with a fresh water oil cooler and a seawater oil cooler, each of a fresh water oil cooler and a seawater oil cooler can be reduced in size, and the freedom degree of arrangement | positioning increases. Further, seawater for engine cooling (for fresh water cooler) can be effectively used for oil cooling.
Furthermore, use of a fresh water oil cooler and a seawater oil cooler can be selected, and the lubricating oil can be cooled when necessary.

  Further, the flow path of the lubricating oil can be shortened, and the piping between the fresh water oil cooler and the seawater oil cooler can be shortened. Further, the maintenance of the bypass valve can be easily performed.

Further , since cooling is performed only with a fresh water cooler having a relatively small capacity at a low load, the lubricating oil can be kept at a relatively high temperature without being supercooled. Therefore, the time required for warming up is shortened and mechanical loss can be reduced.
Further, when the temperature is low, the bypass valve can be closed and the lubricating oil can be cooled only by a fresh water oil cooler, and when the temperature is high, the bypass valve can be opened and cooled by both the fresh water oil cooler and the seawater oil cooler.
Furthermore, when the fresh water oil cooler is configured as a multi-plate type, when the pressure of the lubricating oil increases, the bypass valve can be opened and escaped to the seawater oil cooler, so that the fresh water oil cooler can be prevented from being damaged. Moreover, the cooler capacity | capacitance setting according to an engine output can be made easy.

According to a second aspect of the present invention, in the lubricating oil cooling device according to the first aspect, since the bypass valve (20) is a differential pressure type valve by the spring (21) and the valve body (22), the pressure loss of the lubricating oil is reduced. Can be reduced. In addition, since the valve can be configured with a simple configuration including a spring and a valve body, cost can be reduced. Furthermore, since the bypass valve can be reduced in size, the degree of freedom of the arrangement position is increased.

According to a third aspect of the present invention, in the lubricating oil cooling device according to the first aspect, when the bypass valve (20) is an electromagnetic valve, the solenoid of the electromagnetic valve and a temperature sensor are connected to a controller, and when the temperature becomes equal to or higher than a set temperature. Since it opens, the temperature rise of lubricating oil can be suppressed. Therefore, the lubricating oil can be maintained at an appropriate temperature, and fuel consumption can be improved.

According to a fourth aspect of the present invention, in the lubricating oil cooling device according to the first aspect, when the bypass valve (20) is an electromagnetic valve, the solenoid of the electromagnetic valve and a pressure sensor are connected to a controller, and when the pressure exceeds a set pressure. When the fresh water cooler is configured as a multi-plate type, when the lubricating oil pressure increases, the bypass valve can be opened and escaped to the seawater oil cooler, so that the fresh water oil cooler can be protected. Further, the pressure loss of the lubricating oil can be reduced.

  Next, embodiments of the invention will be described.

  FIG. 1 is a diagram showing a configuration of a lubricating oil cooling device of the present invention, and FIG. 2 is a diagram showing a configuration of a lubricating oil path in the lubricating oil cooling device.

  In a marine engine, a fresh water cooler is disposed on one side of a cylinder head side portion that constitutes the upper part of the engine, and the fresh water cooler cools cooling water that has cooled the engine body with seawater. A cooling device 1 that cools the lubricating oil is disposed on the other side of the cylinder head. As shown in FIGS. 1 and 2, the lubricating oil cooling device 1 includes a fresh water oil cooler 2 that cools lubricating oil using fresh water and a sea water oil cooler 3 that cools lubricating oil using seawater. ing.

  In FIG. 2, a safety valve 24 is connected to the lubricating oil pump 23 so that pressure oil above a specified pressure is drained. A fresh water oil cooler 2 and a seawater oil cooler 3 are connected in parallel to the discharge side of the lubricating oil pump 23, and a bypass valve 20 is connected in series to the upstream side (inlet side) of the seawater oil cooler 3. An oil filter 9 is connected to the outlets of the fresh water cooler 2 and the seawater oil cooler 3, and a pressure regulating valve 25 is connected to the outlet of the oil filter 9, so that pressure oil above a specified pressure is drained. An oil passage for feeding oil to a lubrication point (gallery, etc.) 26 of each part of the engine is connected to the secondary side of the pressure regulating valve 25.

  The fresh water oil cooler 2 is a multi-plate type, and a cooling case 6 fixed to the oil passage case 8 and a plurality of plates 7a, 7a. 7, and the cooling plate 7 is disposed in the cooling case 6. Thereby, the cooler capacity can be easily changed by increasing or decreasing the number of the plates 7a, and the cooler capacity can be easily set according to the engine output.

  A cooling water inlet 6a and a cooling water outlet 6b are provided on both sides of the cooling case 6, respectively. The cooling water inlet 6a is connected to an engine jacket and a fresh water pump via a hose (not shown), and the fresh water is pumped to the engine jacket to cool the engine. Further, the fresh water is supplied to the plates 7a and 7a. It can be sent to the gap of ... The cooling water outlet 6b communicates fresh water after cooling the lubricating oil through a hose and the like to the fresh water cooler.

  Further, a lubricating oil inlet 6c is provided on the cooling water outlet 6b side (lower right in this embodiment) of the cooling case 6, and a lubricating oil outlet 6d is provided on the cooling water inlet 6a side (lower left in this embodiment) of the cooling case 6. Is provided. The oil passage case 8 is formed with oil passages 8a and 8b on the left and right in FIG. 1, and the lubricating oil inlet 6c is connected to a first outlet 8c of the oil passage 8a formed on one side of the oil passage case 8. The inlet 8d of the oil passage 8a is connected to the discharge port of the lubricating oil pump 23. The lubricating oil outlet 6 d is connected to a first inlet 8 f of an oil passage 8 b formed on the other side of the oil passage case 8, and an outlet 8 g of the oil passage 8 b is connected to an oil filter 9. The oil filter 9 is attached to the oil passage case 8 via the attachment block 10 and attached to the opposite side of the fresh water oil cooler 2. An oil path 10a on the inlet side, an oil path 10b on the outlet side, and an oil path 10c for bypass are formed in the mounting block 10, and the oil path 10a is connected to the oil path 8b via an outlet 8g. And the oil filter 9 and the fresh water oil cooler 2 are connected. The oil passage 10b is communicated so that oil filtered by the oil filter 9 is sent to various parts such as an engine gallery, and a bypass valve 20 described later is disposed in the oil passage 10c. The oil passage 8a can be communicated.

  In such a configuration, the lubricating oil stored in the oil pan 12 of the engine is sucked and discharged by the lubricating oil pump 23, sent to the fresh water oil cooler 2 through the oil passage 8a, and cooled from the lubricating oil inlet 6c. It is introduced into the plate 7. The lubricating oil flowing in each plate 7a of the cooling plate 7 is heat-exchanged and cooled, discharged from the lubricating oil outlet 6d, sent to the oil filter 9 through the oil passages 8b and 10a, and then from the oil passage 10b. Supplied to each part of the engine. Further, fresh water is pumped up by a fresh water pump, sent to the cooling water inlet 6a, introduced into the cooling case 6 from the cooling water inlet 6a, and discharged from the cooling water outlet 6b. As a result, while the lubricating oil flows through the cooling plate 7, heat exchange is performed between the lubricating oil and the fresh water flowing through the cooling case 6, thereby cooling the lubricating oil.

  Further, the seawater oil cooler 3 is constituted by a multi-tube type, and a plurality of cooling pipes 14, 14... And a support plate that supports both sides of the cooling pipes 14, 14. 15 and 15 are arranged. In this embodiment, the seawater oil cooler 3 is a multi-tube type and is configured as a multi-plate type with the fresh water oil cooler 2, but this is not particularly limited. For example, the seawater oil cooler is configured as a multi-plate type. Alternatively, the fresh water oil cooler may be configured as a multi-tube type.

  A cooling water inlet 13a and a cooling water outlet 13b are provided on both sides of the cooling case 13, respectively. The cooling water inlet 13a is connected to a hose or the like (not shown) so that fresh water cooler seawater can be fed to the cooling pipes 14, 14. The cooling water outlet 13b communicates with a hose or the like so that the cooled seawater can be discharged outside the apparatus.

  Support plates 15 and 15 are provided in parallel at predetermined intervals on both sides in the cooling case 13 to form three spaces, and the cooling tubes 14, 14... Are parallel between the support plates 15 and 15. It is arranged horizontally. Both ends of the cooling pipes 14, 14... Are inserted into a plurality of support holes opened in the support plates 15, 15 and fixed at the portions of the support plates 15, 15. Thus, one side of each cooling pipe 14 supported by the support plates 15 and 15 communicates with the space where the cooling water inlet 13a is located, and the other side communicates with the space where the cooling water outlet 13b is located.

  A lubricating oil inlet 13c is provided on the cooling water outlet 13b side of the cooling case 13 (upper right in this embodiment), and a lubricating oil outlet 13d is provided on the cooling water inlet 13a side of the cooling case 11 (upper left in this embodiment). Are provided, and each communicates with a space formed at the center of the cooling case 13. The lubricating oil inlet 13 c communicates with the secondary port 10 d of the bypass valve 20 disposed in the mounting block 10 through the oil passage 16, and the lubricating oil pump 23 through the oil passage 8 a of the oil passage case 8. It is connected to the. The lubricating oil outlet 13d communicates with a second inlet 8h provided in the vicinity of the first inlet 8f of an oil passage 8b formed in the oil passage case 8 via an oil passage 17, and is connected to the oil filter 9 through the oil passage 8b. ing.

  In such a configuration, when the hydraulic pressure rises and the bypass valve 20 opens, the lubricating oil discharged from the lubricating oil pump 23 branches from the inlet 8d and is sent to the fresh water oil cooler 2 and the seawater oil cooler 3. The The lubricating oil sent from the second outlet 8e of the oil passage 8a formed in the oil passage case 8 through the oil passages 10c and 16 reaches the seawater oil cooler 2, and the support plate 15 in the cooling case 13 from the lubricating oil inlet 13c.・ Introduced into the space between 15. On the other hand, seawater for the fresh water cooler is sent to the cooling water inlet 13a, introduced into the cooling pipes 14, 14... From the cooling water inlet 13a, and discharged from the cooling water outlet 13b. As a result, heat is exchanged and cooled while flowing through the space between the support plates 15 and 15, and the lubricating oil is sent from the lubricating oil outlet 13d to the oil filter 9 through the oil passages 17, 8b and 10a. It is supplied to each part of the engine from the oil passage 10b.

  And the fresh water cooler 2 and the seawater oil cooler 3 which were comprised as mentioned above are provided in parallel, and the cooling device 1 of lubricating oil is comprised. That is, the lubricating oil cooling device 1 connects one side of the oil passage of the fresh water oil cooler 2 and the seawater oil cooler 3 in parallel to the discharge side of the lubricating oil pump 23, and the oil of the fresh water oil cooler 2 and the seawater oil cooler 3 is connected. By connecting the other side of the passage to the oil filter 9, the lubricating oil stored in the oil pan 12 is discharged from the lubricating oil pump 23 and sent to the fresh water oil cooler 2 or the seawater oil cooler 3, and the fresh water oil cooler 2 Alternatively, it can be cooled by the seawater oil cooler 3. Therefore, the lubricating oil can be cooled by the fresh water oil cooler 2 and the sea water oil cooler 3, so that the lubricating oil is cooled by only one sea water or fresh water oil cooler, so that the capacity tends to increase. The fresh water oil cooler 2 and the seawater oil cooler 3 can be reduced in size, and the degree of freedom of arrangement increases. Moreover, the seawater for fresh water coolers can be used effectively for oil cooling. Further, by connecting a valve to the fresh water oil cooler 2 and the seawater oil cooler 3, the use thereof can be selected, and the lubricating oil can be cooled when necessary.

  In the lubricating oil cooling device 1 having such a configuration, a bypass valve 20 is provided on the upstream side of the seawater oil cooler 3 after branching of the oil supply path to the fresh water oil cooler 2 and the seawater oil cooler 3. That is, the oil in the mounting block 10 that connects the seawater oil cooler 3 side of the oil passage 8 a that branches to the fresh water oil cooler 2 and the seawater oil cooler 3 and the oil passage 16 that communicates with the lubricating oil inlet 13 c of the seawater oil cooler 3. A bypass valve 20 is provided in the passage 10c. Thus, by arranging the bypass valve 20 in the mounting block 10 of the oil filter 9, the flow path of the lubricating oil can be shortened, and the piping between the fresh water oil cooler 2 and the seawater oil cooler 3 is shortened. Further, the maintenance of the bypass valve 20 is facilitated.

  The bypass valve 20 is configured as a differential pressure type valve by a spring 21 and a valve body 22. That is, the bypass valve 20 is configured such that a hole provided in the mounting block 10, that is, a valve body 22 slidably inserted into the oil passage 10c is urged to the closed side by a spring 21. The valve body 22 closes the space between the oil passage 10c and the secondary port 10d. In addition, a communication oil passage 10e is communicated between the oil passage 10a and the back chamber of the valve body 22 housed in the oil passage 10c. When the engine speed increases and the oil flow rate in the oil passage 8a on the side of the fresh water oil cooler 2 increases and becomes higher than the pressure in the oil passage 10e, the valve body 22 resists the spring force by this oil pressure. When pressed, the valve body 22 is configured to open. Therefore, the pressure loss of the lubricating oil can be reduced by the bypass valve 20. Moreover, since the bypass valve 20 is a differential pressure type valve, the valve can be configured with a simple configuration, so that the cost can be reduced. Furthermore, since the bypass valve can be reduced in size in this case, the degree of freedom of arrangement position is also increased.

  With this configuration, when the load applied to the engine is low, the differential pressure before and after the valve element 22 is smaller than the spring force, and the bypass valve 20 is closed. Therefore, the lubricating oil discharged from the lubricating oil pump 23 flows only to the fresh water oil cooler 2 and is cooled.

  On the other hand, when the load on the engine is high, the hydraulic flow rate on the upstream side of the fresh water oil cooler 2 increases, the differential pressure across the valve body 22 becomes greater than the spring force, that is, greater than the back pressure. 20 will open. Therefore, the lubricating oil discharged by the circulating oil pump 13 flows to the fresh water oil cooler 2 and also flows to the sea water oil cooler 3 and is cooled by the fresh water oil cooler 2 and the sea water oil cooler 3.

  Therefore, the lubricating oil is cooled only by a relatively small capacity fresh water cooler immediately after the engine is started or at a low load such as idling, and the lubricating oil can be kept at a relatively high temperature without being overcooled. . Therefore, the time required for warming up is short, and mechanical loss can be reduced. Further, when the temperature is low, the fresh oil cooler 2 cools the lubricating oil, and when the temperature is high, the bypass valve 22 is opened so that both the fresh water oil cooler 2 and the seawater oil cooler 3 can cool the lubricating oil. Easy to keep. Furthermore, since the pressure applied to the fresh water oil cooler 2 can be reduced by opening the bypass valve 20 and allowing the lubricating oil to flow to the seawater oil cooler 3 side, damage to the fresh water oil cooler 2 due to the pressure can be prevented.

  Further, the bypass valve 20 may be constituted by an electromagnetic valve. In this case, the solenoid constituting the electromagnetic valve is connected to the controller, and a temperature sensor attached to the cooling case is connected to the controller, and the bypass valve is opened when the temperature of the lubricating oil detected by the temperature sensor exceeds the set temperature. Configure as follows. As a result, when the temperature of the lubricating oil becomes equal to or higher than the set temperature, the solenoid of the electromagnetic valve is activated, the bypass valve opens, and the lubricating oil that has been flowing only to the fresh water oil cooler 2 also flows to the seawater oil cooler 3, Since the lubricating oil can be cooled by the fresh water oil cooler 2 and the seawater oil cooler 3, an increase in the temperature of the lubricating oil can be suppressed. Further, since the lubricating oil can be supplied to each part of the engine while maintaining an appropriate temperature, fuel efficiency can be improved.

  Further, a pressure sensor may be connected to the controller instead of the temperature sensor, and the bypass valve may be opened when the lubricant pressure detected by the pressure sensor becomes equal to or higher than the set pressure. Thereby, the pressure loss of lubricating oil can be reduced. In addition, when the lubricating oil pressure exceeds the set pressure, the solenoid of the solenoid valve is actuated, and the bypass valve can be opened to allow the seawater oil cooler 3 to escape. Therefore, excessive pressure is applied to the fresh water oil cooler 2 constituted by a multi-plate type. Can be prevented, and the fresh water oil cooler 2 can be protected.

The figure which shows the structure of the lubricating oil cooling device of this invention. The figure which shows the structure of the lubricating oil path | route in a lubricating oil cooling device.

DESCRIPTION OF SYMBOLS 1 Lubricating oil cooling device 2 Fresh water oil cooler 3 Seawater oil cooler 9 Oil filter 10 Mounting block 20 Bypass valve 21 Spring 22 Valve body

Claims (4)

A fresh water cooler that cools cooling water that has cooled the engine body with seawater, a fresh water oil cooler (2) that cools lubricating oil, and a seawater oil cooler (3) that is arranged in parallel with the fresh water oil cooler (2) A marine engine, wherein the fresh water oil cooler (2) and the seawater oil cooler (3) are connected to the discharge side of the lubricating oil pump (23), and the bypass is connected to the inlet side of the seawater oil cooler (3). Cooling of lubricating oil with a valve (20) connected in series, the fresh water oil cooler (2) and the seawater oil cooler (3) joined at the outlet, and an oil filter (9) connected to the outlet of the joined portion In the apparatus, the oil passage case (8) is fixed to the side of the cooling case (6) constituting the fresh water oil cooler (2), and the mounting block (10) is attached to the side surface of the oil passage case (8). Through And a cooling water inlet (6a) and a cooling water outlet (6b) are provided on both sides in the longitudinal direction of the cooling case (6), respectively, and the cooling water outlet of the cooling case (6) is provided. (6b) a lubricating oil inlet (6c) is provided on the side portion, a lubricating oil outlet (6d) is provided on the cooling water inlet (6a) side portion of the cooling case (6), and the lubricating oil inlet (6c) Connected to the first outlet (8c) of the inlet oil passage (8a) formed on one side of the oil passage case (8), the lubricating oil outlet (6d) is connected to the other side of the oil passage case (8). A first inlet (8f) of the formed outlet oil passage (8b) is connected, and an inlet (8d) of the inlet oil passage (8a) is connected to a discharge port of the lubricating oil pump (23). The outlet (8g) of the passage (8b) is connected to the inlet side oil passage (10a) of the oil filter (9), and the mounting block 10), an inlet side oil passage (10a), an outlet side oil passage (10b) and a bypass oil passage (10c) of the oil filter (9) are formed, and the inlet side oil passage (10a) It connects with the said exit oil path (8b) via an exit (8g), this oil filter (9) and fresh water oil cooler (2) are connected, The said exit side oil path (10b) is an oil filter (9) The oil is filtered so as to feed oil to each part of the engine, and the bypass oil passage (10c) is configured with a bypass valve (20), and the seawater oil cooler (3) is configured as a cooling case. The lubricating oil inlet (13c) of (13) communicates with the secondary port (10d) of the bypass valve (20) arranged in the mounting block (10), and the inlet oil passage of the oil passage case (8). Connected to the lubricating oil pump (23) via (8a) The lubricating oil outlet (13d) of the rejection case (13) communicates with a second inlet (8h) provided in the outlet oil passage (8b) of the oil passage case (8), and oil is supplied from the outlet oil passage (8b). It is connected to the filter (9), and is configured to be cooled only by a small-capacity fresh water oil cooler (2) at a low load, and to be cooled together with a seawater oil cooler (3) at a high load. Lubricating oil cooling device. The lubricating oil cooling device according to claim 1 , wherein the bypass valve (20) is a differential pressure type valve by a spring (21) and a valve body (22). The cooling device for lubricating oil according to claim 1 , wherein the bypass valve (20) is constituted by an electromagnetic valve, the solenoid of the electromagnetic valve and a temperature sensor are connected to a controller, and the solenoid valve opens when the temperature exceeds a set temperature. Lubricating oil cooling device characterized. The lubricating oil cooling device according to claim 1 , wherein the bypass valve (20) is constituted by an electromagnetic valve, and the solenoid of the electromagnetic valve and a pressure sensor are connected to a controller so as to open when the pressure exceeds a set pressure. Lubricating oil cooling device characterized.

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