transmission

Abstract

The present application relates to the technical field of vehicle engineering, and provides a transmission, wherein an oil storage pool is arranged in a housing; a transmission assembly part can extend into the oil storage pool; an oil storage tank is fixed in a containing cavity; an oil injection device is used for injecting oil into the transmission assembly; an oil supply pipe group has an oil inlet end communicated with the oil storage pool, two oil outlet ends respectively communicated with the oil storage tank and the oil injection device one by one, and a first driving member arranged at the oil inlet end and used for passing the oil from the oil storage pool into the oil injection device and / or the oil storage tank; a first electromagnetic flow valve is arranged at the oil outlet end communicated with the oil storage tank and used for adjusting the opening size; and a TCU control unit is in communication connection with the first electromagnetic flow valve, can dynamically adjust the oil amount flowing into the oil storage tank according to the working condition of the transmission, change the oil level in the oil storage pool, ensure sufficient lubrication during heavy load, eliminate the oil stirring loss as much as possible during light load, and improve the transmission efficiency under various working conditions of the transmission.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle engineering, and in particular to a transmission. Background Art

[0002] Currently, the main lubrication methods for domestic heavy-duty multi-speed transmissions are splash lubrication and forced lubrication. Different lubrication methods produce different resistance to the gears, with splash lubrication having greater resistance and forced lubrication having less resistance. Lubrication resistance has a significant impact on transmission efficiency, and therefore forced lubrication is widely adopted by commercial vehicle transmissions both domestically and internationally. The amount of lubricating oil required for different load conditions varies significantly, with more required for maximum and medium load conditions, and less required for general and low load conditions. To ensure reliability under different operating conditions, transmissions using forced lubrication must design the transmission lubrication system and oiling volume based on the maximum load condition. This results in redundant lubricating oil under general and low load conditions, increasing churning losses in the gear transmission and impacting further improvements in transmission efficiency. It is difficult to balance the oil requirements for transmission reliability and efficiency.

[0003] Therefore, a transmission is urgently needed to solve the above technical problems. Summary of the Invention

[0004] The purpose of the present invention is to provide a transmission that can adjust the lubrication mode of the transmission components according to the working conditions, thereby improving the transmission efficiency of the transmission under various working conditions.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] Transmission, including:

[0007] A housing, wherein a receiving cavity is formed in the housing, and an oil storage tank is provided at the bottom of the receiving cavity;

[0008] A transmission assembly, wherein the transmission assembly portion is capable of extending into the oil reservoir;

[0009] An oil storage tank, the oil storage tank being fixed in the accommodating cavity;

[0010] An oil spray device, the oil spray device is disposed in the accommodating cavity and fixed to the housing, with an oil spray port of the oil spray device facing the transmission assembly;

[0011] a delivery assembly, the delivery assembly being disposed in the accommodating chamber, the delivery assembly comprising an oil supply pipe assembly, a first drive member, and a first electromagnetic flow valve; the oil supply pipe assembly comprising an oil inlet end and two oil outlet ends, the oil inlet end being in communication with the oil reservoir, the two oil outlet ends corresponding to and in communication with the oil storage tank and the oil injection device, respectively; the first drive member being disposed at the oil inlet end and configured to pass oil from the oil reservoir into the oil injection device and / or the oil storage tank; and the first electromagnetic flow valve being disposed at the oil outlet end in communication with the oil storage tank and configured to adjust the size of its opening;

[0012] The TCU control unit is communicatively connected with the first electromagnetic flow valve to control the opening and closing size thereof.

[0013] As a preferred technical solution for the above-mentioned transmission, the above-mentioned oil supply pipe group includes an oil suction pipe, a first oil delivery pipe, a second oil delivery pipe, a third oil delivery pipe and a three-way valve. One end of the above-mentioned oil suction pipe is connected to the above-mentioned oil storage tank, and the other end is connected to one end of the above-mentioned first oil delivery pipe through the above-mentioned first driving member. The other end of the above-mentioned first oil delivery pipe is connected to the above-mentioned second oil delivery pipe and the above-mentioned third oil delivery pipe respectively through the above-mentioned three-way valve. The above-mentioned second oil delivery pipe is provided with the above-mentioned first electromagnetic flow valve and is connected to the above-mentioned oil storage tank. The above-mentioned third oil delivery pipe is connected to the above-mentioned oil injection device.

[0014] As a preferred technical solution for the transmission, the first oil pipeline is provided with a one-way valve, so that the oil flows from the oil reservoir to the three-way valve in a one-way manner.

[0015] As a preferred technical solution of the above-mentioned transmission, the above-mentioned oil inlet end of the above-mentioned oil supply pipe group is arranged at the bottom of the above-mentioned oil storage tank.

[0016] As a preferred technical solution of the above-mentioned transmission, the above-mentioned delivery assembly further includes a filter element, and the above-mentioned filter element is arranged at the above-mentioned oil inlet end of the above-mentioned oil supply pipe group.

[0017] As a preferred technical solution for the above-mentioned transmission, the above-mentioned conveying assembly also includes a filter element. An oil supply groove is provided at the bottom of the above-mentioned oil storage tank. The above-mentioned filter element is arranged at the opening of the above-mentioned oil supply groove to intercept impurities outside the above-mentioned oil supply groove. The oil inlet end of the above-mentioned oil supply pipe group is located in the above-mentioned oil supply groove.

[0018] As a preferred technical solution for the transmission, the oil storage tank is fixed to the top of the accommodating cavity, and an oil leakage port is provided on the bottom wall of the oil storage tank, so that the oil can drip onto the transmission assembly from the oil leakage port.

[0019] As a preferred technical solution for the above-mentioned transmission, the above-mentioned transmission assembly includes multiple gear pairs, the injection ports of the above-mentioned injection device correspond one-to-one to the above-mentioned gear pairs, and the above-mentioned injection ports are provided with a second electromagnetic flow valve for controlling the opening size of the above-mentioned injection ports.

[0020] As a preferred technical solution of the above-mentioned transmission, a reinforcing rib is provided at the connection position between the above-mentioned oil storage tank and the above-mentioned housing.

[0021] As a preferred technical solution of the above-mentioned transmission, it also includes a heat exchange component, which is arranged in the above-mentioned oil storage tank and is used to reduce the temperature of the above-mentioned oil in the above-mentioned oil storage tank.

[0022] Beneficial effects of the present invention:

[0023] An oil reservoir is provided at the bottom of the accommodating cavity, which is used to hold oil. When the first driving member is driven, the oil can be drawn out from the oil reservoir and transported to the oil tank and the oil injection device through the oil supply pipe group. The oil injection device can spray the oil from the oil injection port onto the transmission component to provide forced lubrication for it; the oil reservoir can store part of the oil; the TCU control unit can judge the current working load of the transmission according to the load weight of the vehicle body at this time, the inclination of the driving road, the driving speed of the vehicle, the torque and speed of the engine and other information. When the vehicle load is large, the lubrication demand of the transmission component is large, and the TCU control unit controls the first electromagnetic flow valve to reduce its opening so that the oil is more It tends to flow toward the oil injection device, which reduces the oil flowing to the oil storage tank and increases the oil flowing to the oil injection device, thereby increasing the oil used for forced lubrication of the transmission component, ensuring sufficient lubrication of the transmission component under heavy load; when the vehicle load is light, the lubrication demand of the transmission component is relatively small, and the TCU control unit controls the first electromagnetic flow valve to increase its opening, so that more oil flows into the oil storage tank, thereby reducing the amount of oil discharged from the oil injection device. Since the output of the oil in the oil storage tank is less than the input, the oil level in the oil storage tank drops, reducing the part in contact with the transmission component, thereby reducing the work loss of stirring the oil when the transmission component rotates.

[0024] In this way, the TCU control unit is communicated with the first electromagnetic flow valve, and can dynamically adjust the amount of oil flowing into the oil tank according to the transmission operating conditions, thereby changing the oil level in the oil reservoir. This can not only ensure sufficient lubrication under heavy loads, but also eliminate oil churning losses as much as possible under light loads, thereby improving the transmission efficiency of the transmission under various operating conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in describing the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without any creative work.

[0026] Figure 1 It is a structural schematic diagram of a transmission provided by an embodiment of the present invention.

[0027] In the picture:

[0028] 10. Housing; 11. Accommodating chamber; 12. Oil reservoir;

[0029] 20. Transmission components;

[0030] 30. Oil storage tank; 31. Oil leakage port;

[0031] 40. Fuel injection device; 41. Fuel injection port;

[0032] 511. Oil suction pipe; 512. First oil delivery pipe; 513. Second oil delivery pipe; 514. Three-way valve; 52. First driving element; 53. First electromagnetic flow valve; 54. Filter element. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0034] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0035] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0036] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meanings.

[0037] like Figure 1 As shown, the present application provides a transmission, including a housing 10, a transmission assembly 20, an oil storage tank 30, an oil injection device 40, a delivery assembly, and a TCU control unit. The housing 10 has a receiving chamber 11, and an oil reservoir 12 is provided at the bottom of the receiving chamber 11; the transmission assembly 20 can partially extend into the oil reservoir 12; the oil storage tank 30 is fixed in the receiving chamber 11; the oil injection device 40 is provided in the receiving chamber 11 and fixed to the housing 10, with the oil injection port 41 of the oil injection device 40 facing the transmission assembly 20; the delivery assembly is provided in the receiving chamber 11, and the delivery assembly includes an oil supply pipe group, a first driving member 52, and a first electromagnetic flow valve 53. The oil supply pipe group includes a first driving member 52, and a first electromagnetic flow valve 53. The oil inlet end and two oil outlet ends are connected to the oil storage tank 12, and the two oil outlet ends correspond to and are connected to the oil storage tank 30 and the oil injection device 40 respectively. A first driving member 52 is arranged at the oil inlet end, which is used to pass the oil from the oil storage tank 12 into the oil injection device 40 and / or the oil storage tank 30. A first electromagnetic flow valve 53 is arranged at the oil outlet end connected to the oil storage tank 30, which is used to adjust the size of its opening; the TCU control unit is communicated with the first electromagnetic flow valve 53 to control its opening and closing size.

[0038] Specifically, an oil reservoir 12 is provided at the bottom of the accommodating chamber 11. The oil reservoir 12 is used to hold oil. When the first driving member 52 is driven, the oil can be drawn out from the oil reservoir 12 and transported to the oil storage tank 30 and the oil injection device 40 through the oil supply pipe group. The oil injection device 40 can spray the oil from the oil injection port 41 onto the transmission component 20 to provide forced lubrication for it; the oil storage tank 30 can store part of the oil; the TCU control unit can judge the current working load of the transmission according to the load weight of the vehicle body at this time, the inclination of the driving road, the driving speed of the vehicle, the torque and speed of the engine and other information. When the vehicle load is large, the lubrication demand of the transmission component 20 is large, and the TCU control unit controls the first electromagnetic flow valve 53 to reduce its opening, so that the oil is more inclined to flow to the oil injection device 4 0, so that the oil flowing into the oil storage tank 30 is reduced, while the oil flowing into the oil injection device 40 is increased, thereby increasing the oil used for forced lubrication of the transmission component 20, and part of the transmission component can be immersed in the oil storage tank, implementing splash lubrication, and ensuring sufficient lubrication of the transmission component 20 under heavy load; when the vehicle load is light, the lubrication demand of the transmission component 20 is relatively small, and the TCU control unit controls the first electromagnetic flow valve 53 to increase its opening, so that more oil flows into the oil storage tank 30, thereby reducing the amount of oil discharged from the oil injection device 40. Since the output of the oil in the oil storage tank 12 is less than the input, the oil level in the oil storage tank 12 drops, reducing the part in contact with the transmission component 20, thereby reducing the work loss of stirring the oil when the transmission component 20 rotates.

[0039] Furthermore, since the output of the oil in the oil reservoir 12 is always greater than the input, in order to prevent the situation where there is no oil in the oil injection device 40 for forced lubrication of the transmission assembly 20 when the vehicle is driving.

[0040] Optionally, the volume of the oil storage tank 30 is smaller than the volume of the oil reservoir 12. In this way, when the oil storage tank 30 is filled with oil, the first driving member 52 can no longer continue to pass the oil in the oil reservoir 12 into the oil storage tank 30, so that the oil reservoir 12 only forms an oil flow circulation with the oil injection device 40 to meet the basic lubrication needs of the transmission component 20 when the vehicle is driving.

[0041] Optionally, the oil tank 30 is equipped with a liquid level sensor and a second drive member. When the oil level in the oil tank 30 reaches a preset threshold, the liquid level sensor is triggered. The liquid level sensor can communicate with the TCU control unit, and the TCU control unit can stop the first drive member 52 from working and drive the second drive member to start at the same time, so that the oil in the oil tank 30 is passed into the oil injection device 40, and the oil falls back into the oil storage pool 12 through the oil injection device 40, or is directly discharged from the oil tank 30 into the oil storage pool 12. Subsequently, the first drive member 52 is started and the second drive member is stopped.

[0042] It should be noted that when the oil storage tank 30 is located above the oil storage pool 12 in the vertical direction, the oil in the oil storage tank 30 can be discharged into the oil storage pool 12 by gravity, and the second driving member is no longer required.

[0043] Specifically, the oil supply pipe group includes an oil suction pipe 511, a first oil delivery pipe 512, a second oil delivery pipe 513, a third oil delivery pipe and a three-way valve 514. One end of the oil suction pipe 511 is connected to the oil storage tank 12, and the other end is connected to one end of the first oil delivery pipe 512 through the first driving member 52. The other end of the first oil delivery pipe 512 is connected to the second oil delivery pipe 513 and the third oil delivery pipe respectively through the three-way valve 514. The second oil delivery pipe 513 is provided with a first electromagnetic flow valve 53 and is connected to the oil storage tank 30. The third oil delivery pipe is connected to the oil injection device 40.

[0044] Optionally, the first oil delivery pipe 512 is provided with a one-way valve to allow oil to flow from the oil reservoir 12 to the three-way valve 514 in one direction. This arrangement allows oil from the oil tank 30 to be injected into the oil injection device 40 to lubricate the transmission assembly 20 when the first driving member 52 stops operating, while preventing the oil from flowing directly back into the oil reservoir 12.

[0045] Optionally, the oil inlet end of the oil supply pipe group is arranged at the bottom of the oil reservoir 12. Such arrangement makes it easier for the oil in the oil reservoir 12 to flow into the oil inlet end of the oil supply pipe group.

[0046] The oil sprayed by the oil sprayer 40 into the transmission assembly 20 not only lubricates the gear pair and / or shaft but also washes away impurities on their surfaces as the oil flows through them. The impurity-laden oil enters the oil reservoir 12 for further recycling. However, impurities in the oil supply pipe assembly can block the oil supply pipe assembly and damage the first drive member 52 during the recycling process. Therefore, in this embodiment, the delivery assembly further includes a filter 54 disposed at the oil inlet end of the oil supply pipe assembly. This filter 54 traps impurities outside the oil supply pipe assembly, purifying the circulating oil.

[0047] In other embodiments, an oil supply groove is opened at the bottom of the oil storage tank 12, and a filter 54 is disposed at the opening of the oil supply groove to intercept impurities outside the oil supply groove. The oil inlet end of the oil supply pipe assembly is located inside the oil supply groove.

[0048] Optionally, an oil reservoir 30 is fixed to the top of the accommodating chamber 11, and an oil leak 31 is formed on the bottom wall of the oil reservoir 30, through which oil can drip onto the transmission assembly 20. This arrangement allows oil to drip directly from the oil reservoir 30 through the oil leak 31 onto the transmission assembly 20 as a supplement to the low rotational speed of the first driving member 52, which causes the oil sprayed by the oil spraying device 40 to fail to meet lubrication requirements.

[0049] Specifically, the transmission assembly 20 comprises a rotating shaft, a gear shifting mechanism and a plurality of gear pairs. For the convenience of description, taking the first gear pair and the second gear pair as examples, the gear shifting mechanism, the first gear pair and the second gear pair are all sleeved on the rotating shaft, wherein the gear shifting mechanism is fixedly connected with the rotating shaft, and is located between the first gear pair and the second gear pair along the axial direction of the rotating shaft and can be selectively connected in transmission. In this way, when the first gear pair is connected in transmission with the rotating shaft through the gear shifting mechanism, the load of the first gear pair is increased, and the second gear pair rotates relative to the rotating shaft and is in an idle state. In order to more reasonably distribute the supply of oil, in the embodiment, the oil injection port 41 of the oil injection device 40 corresponds to the gear pairs one by one, and the oil injection port 41 is provided with a second electromagnetic flow valve for controlling the opening size of the oil injection port 41. In this way, when the rotating shaft is connected in transmission with the first gear pair, the opening of the second electromagnetic flow valve at the oil injection port 41 corresponding to the first gear pair is increased, so that the oil in the oil injection device 40 is more inclined to be discharged from the oil injection port 41, thereby increasing the oil flow of the oil injection port 41 and giving sufficient lubrication to the gear pair with larger load.

[0050] When the vehicle is running, the vehicle body will often sway due to uneven road surface. The housing 10 of the transmission is fixed on the vehicle body and slides with the movement of the vehicle body. The oil in the housing 10 will also sway, and under repeated impact of the oil, the oil tank 30 is prone to swing relative to the housing 10, so that the stress at the connecting position of the two is increased, and the risk of loosening may occur. Therefore, in the embodiment, the connecting position of the oil tank 30 and the housing 10 is provided with a reinforcing rib. In this way, the connecting strength of the oil tank 30 and the housing 10 is enhanced by the reinforcing rib, and when the vehicle sways, the reinforcing rib makes the consistency of the swing of the oil tank 30 and the housing 10 higher.

[0051] Further, since the transmission assembly 20 generates heat during rotation, especially when the load is large or the rotating speed is high, the heat generation phenomenon of the transmission assembly 20 is particularly obvious. Therefore, in the embodiment, the transmission further comprises a heat exchange assembly arranged in the oil storage pool 12 for reducing the temperature of the oil in the oil storage pool 12. In this way, when the oil flows through the surface of the transmission assembly 20, heat exchange occurs between the oil and the transmission assembly 20 to reduce the temperature of the transmission assembly 20. After the oil returns to the oil storage pool 12, the temperature of the oil is reduced by the heat exchange assembly, so that the oil can repeatedly cool the transmission assembly 20.

[0052] Furthermore, the above are only preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will appreciate that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions are possible for those skilled in the art without departing from the scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the scope of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A transmission, characterized in that include: A housing (10), wherein a receiving chamber (11) is provided in the housing (10), and an oil storage tank (12) is provided at the bottom of the receiving chamber (11); a transmission assembly (20), wherein a portion of the transmission assembly (20) is capable of extending into the oil reservoir (12); An oil storage tank (30), the oil storage tank (30) being fixed in the accommodating cavity (11); an oil spray device (40), the oil spray device (40) being disposed in the accommodating cavity (11) and fixed to the housing (10), the oil spray port (41) of the oil spray device (40) facing the transmission assembly (20); A conveying assembly, wherein the conveying assembly is arranged in the accommodating chamber (11), and the conveying assembly includes an oil supply pipe group, a first driving member (52) and a first electromagnetic flow valve (53). The oil supply pipe group includes an oil inlet end and two oil outlet ends. The oil inlet end is connected to the oil storage tank (12), and the two oil outlet ends correspond to and are connected to the oil storage tank (30) and the oil injection device (40) respectively. The first driving member (52) is arranged at the oil inlet end and is used to pass oil from the oil storage tank (12) into the oil injection device (40) and / or the oil storage tank (30). The first electromagnetic flow valve (53) is arranged at the oil outlet end connected to the oil storage tank (30) and is used to adjust the size of its opening. a TCU control unit, the TCU control unit being in communication with the first electromagnetic flow valve (53) for controlling the opening and closing thereof, the TCU control unit judging the current transmission load according to the load weight of the vehicle body at that time, the inclination of the driving road, the driving speed of the vehicle, the torque and speed information of the engine, and when the vehicle load is large, the lubrication demand of the transmission assembly (20) is large, and the TCU control unit controls the first electromagnetic flow valve (53) to reduce its opening, and when the vehicle load is small, the TCU control unit controls the first electromagnetic flow valve (53) to increase its opening; The oil supply pipe group comprises an oil suction pipe (511), a first oil delivery pipe (512), a second oil delivery pipe (513), a third oil delivery pipe and a three-way valve (514). One end of the oil suction pipe (511) is in communication with the oil storage tank (12), and the other end is in communication with one end of the first oil delivery pipe (512) via the first driving member (52). The other end of the first oil delivery pipe (512) is in communication with the second oil delivery pipe (513) and the third oil delivery pipe respectively via the three-way valve (514). The second oil delivery pipe (513) is provided with the first electromagnetic flow valve (53) and is in communication with the oil storage tank (30). The third oil delivery pipe is in communication with the oil injection device (40).

2. The transmission according to claim 1, characterized in that The first oil delivery pipe (512) is provided with a one-way valve, so that the oil flows from the oil storage tank (12) to the three-way valve (514) in a one-way manner.

3. The transmission according to claim 1, characterized in that The oil inlet end of the oil supply pipe group is arranged at the bottom of the oil storage tank (12).

4. The transmission according to claim 1, characterized in that The delivery assembly further comprises a filter element (54), and the filter element (54) is arranged at the oil inlet end of the oil supply pipe group.

5. The transmission according to claim 1, wherein: The conveying assembly further comprises a filter (54), an oil supply groove is provided at the bottom of the oil storage tank (12), the filter (54) is arranged at the opening of the oil supply groove to intercept impurities outside the oil supply groove, and the oil inlet end of the oil supply pipe group is located in the oil supply groove.

6. The transmission according to claim 1, characterized in that The oil storage tank (30) is fixed to the top of the accommodating cavity (11), and an oil leakage port (31) is provided on the bottom wall of the oil storage tank (30), and the oil can drip from the oil leakage port (31) onto the transmission assembly (20).

7. The transmission according to claim 1, characterized in that The transmission assembly (20) includes a plurality of gear pairs, the oil injection ports (41) of the oil injection device (40) correspond one-to-one to the gear pairs, and the oil injection ports (41) are provided with second electromagnetic flow valves for controlling the opening size of the oil injection ports (41).

8. The transmission according to claim 1, wherein: A reinforcing rib is provided at the connection position between the oil storage tank (30) and the housing (10).

9. The transmission according to any one of claims 1 to 8, characterized in that: It also includes a heat exchange component, which is arranged in the oil storage tank (12) and is used to reduce the temperature of the oil in the oil storage tank (12).

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