Lubricating oil composition and cycle system using the same

Abstract

The invention provides a lubricating oil composition capable of controlling the temperature of a secondary battery, a motor and a speed reducer, and a circulation system using the lubricating oil composition. The lubricating oil composition circulates in a circulation circuit connected to at least a secondary battery, a motor, and a decelerator, and controls the temperature of at least the secondary battery, the motor, and the decelerator. The surface temperature T12 (DEG C) of the silver bar 12 seconds after the silver bar having an initial surface temperature T0 of 200 DEG C has been placed in the lubricating oil composition at 80 DEG C in accordance with the "Cooling Performance Test Method: Method A" specified in JIS K22242: 2012, the silver bar temperature change amount [Delta] T calculated from T0-T12 is 70 DEG C or more, the flash point measured by the Crippa open cup method (C.O.C method) in accordance with JIS K2265-4: 2007 is 100 DEG C or more, and the silver bar temperature change amount [Delta] T calculated from T0-T12 is 70 DEG C or more. And the volume resistivity measured in accordance with JIS C2101: 1999 is 1.0 * 107 [Omega] * cm or more.

Description

Technical Field

[0001] The present invention relates to a lubricating oil composition that circulates in a circulation loop connected to an object, and a circulation system using the lubricating oil composition. Background Art

[0002] Conventionally, a battery cooling system is known, which has a circulation loop for circulating oil that is shared by a transaxle, a battery, and an oil cooler, and uses the oil for lubricating the transaxle for cooling the battery. A motor is provided inside a housing that houses the transaxle, and the oil is used for cooling the motor (Patent Document 1).

[0003] Prior Art Documents

[0004] Patent Documents

[0005] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2020-62964 Summary of the Invention

[0006] Problems to be Solved by the Invention

[0007] A motor sometimes has semiconductors, and the semiconductors generate heat when the motor operates. In addition, electricity flows through the battery and the transaxle. Therefore, heat resistance and insulation performance are required for the oil flowing through them.

[0008] Means for Solving the Problems

[0009] The present invention provides a lubricating oil composition and a circulation system using the lubricating oil composition. As specific embodiments of the present invention, they are as described in the following [1] to

[15] .

[0010] [1]

[0011] A lubricating oil composition that circulates in a circulation loop connected to at least a secondary battery, a motor, and a speed reducer, and is used to at least control the temperatures of the secondary battery, the motor, and the speed reducer.

[0012] According to the "Cooling Performance Test Method: Method A" specified in JIS K2242:2012, the surface temperature T of a silver rod 12 seconds after placing a silver rod with an initial surface temperature T0 of 200°C into the lubricating oil composition at 80°C is measured. 12 (°C), and the change in the silver rod temperature ΔT calculated based on T0 - T 12 is 70°C or more.

[0013] The flash point measured by the Cleveland open cup method (C.O.C method) according to JIS K2265-4:2007 is 100°C or more.

[0014] The volume resistivity measured according to JIS C2101:1999 is 1.0×10 7 Ω·cm or more.

[0015] [2]

[0016] According to the lubricating oil composition described in [1] above, its kinematic viscosity at 30 °C is 5.0 to 40.0 mm 2 / s.

[0017] [3]

[0018] According to the lubricating oil composition described in [1] or [2] above, wherein the lubricating oil composition contains a base oil and one or more lubricating oil additives selected from antiwear agents, metal deactivators, metal detergents, dispersants, and defoamers.

[0019] [4]

[0020] According to the lubricating oil composition described in any one of [1] to [3] above, its transmittance is 90% or more.

[0021] [5]

[0022] A circulation system, which has a circulation loop connected to at least a secondary battery, an electric motor, and a speed reducer, the circulation loop can circulate the lubricating oil composition described in any one of [1-4] above, and at least control the temperature of the secondary battery, the electric motor, and / or the speed reducer.

[0023] [6]

[0024] According to the circulation system described in [5] above, wherein the circulation loop further has a first passage connected to the secondary battery and a second passage connected to the electric motor and the speed reducer.

[0025] [7]

[0026] According to the circulation system described in [6] above, wherein both the first passage and the second passage are connected to the same radiator.

[0027] [8]

[0028] According to the circulation system described in [6] or [7] above, wherein the first passage and the second passage are connected in parallel.

[0029] [9]

[0030] According to the circulation system described in [6] or [7] above, wherein at least a part of the circulation loop connects the secondary battery in series with the electric motor and the speed reducer.

[0031]

[10]

[0032] The circulatory system according to any one of [6] to [9] above, wherein the first passage and / or the second passage is provided with an oil pump.

[0033]

[11]

[0034] The circulatory system according to any one of [6] to

[10] above, wherein the first passage and the second passage are both connected to the same fuel tank.

[0035]

[12]

[0036] The circulatory system according to any one of [6] to

[11] above, wherein the first passage and the second passage are both connected to the same oil pump.

[0037]

[13]

[0038] The circulatory system according to any one of [6] to

[12] above, further comprising a control valve provided at a connection portion between the first passage and the second passage.

[0039]

[14]

[0040] The circulatory system according to any one of [6] to

[13] above, further comprising a control valve that controls the flow of the lubricating oil composition from the oil cooler to the first passage and / or the second passage.

[0041]

[15]

[0042] The circulatory system according to

[13] or

[14] above, wherein the control valve opens and closes according to the temperature of the secondary battery.

[0043]

[16]

[0044] The circulatory system according to any one of

[13] to

[15] above, wherein the control valve opens and closes according to the temperatures of the motor and the speed reducer.

[0045] Advantages of the Invention

[0046] According to the lubricating oil composition and the circulatory system using the lubricating oil composition, which are suitable embodiments of the present invention, a lubricating oil composition capable of controlling the temperatures of the secondary battery, the motor, and the speed reducer, and a circulatory system using the lubricating oil composition can be obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 is a schematic diagram showing an example of the circulatory system of the present invention.

[0048] Figure 2It is a schematic diagram showing an example of the circulation system of the present invention.

[0049] Figure 3 It is a schematic diagram showing an example of the circulation system of the present invention.

[0050] Figure 4 It is a schematic diagram showing an example of the circulation system of the present invention.

[0051] Figure 5 It is a schematic diagram showing an example of the circulation system of the present invention.

[0052] Figure 6 It is a schematic diagram showing an example of the circulation system of the present invention.

[0053] Figure 7 It is a schematic diagram showing an example of the circulation system of the present invention.

[0054] Figure 8 It is a schematic diagram showing an example of the circulation system of the present invention.

[0055] Figure 9 It is a schematic diagram showing an example of the circulation system of the present invention. Detailed implementation mode

[0056] 〔Composition of lubricating oil composition〕

[0057] First, a lubricating oil composition according to an embodiment of the present invention will be described.

[0058] The lubricating oil composition of the present invention is a lubricating oil composition that circulates in a circulation loop connected to at least a secondary battery, an electric motor, and a speed reducer and is used to control the temperature of at least the secondary battery, the electric motor, and the speed reducer, and satisfies the following conditions (I) to (III).

[0059] ・Condition (I): The surface temperature T of the silver rod 12 seconds after putting a silver rod with an initial surface temperature T0 of 200 °C into the lubricating oil composition at 80 °C is measured according to the "Cooling performance test method: Method A" specified in JIS K2242:2012 12 (°C), and the temperature change amount ΔT of the silver rod calculated according to T0 - T 12 is 70 °C or more.

[0060] ・Condition (II): The flash point measured by the Cleveland open cup method (C.O.C method) according to JIS K2265-4:2007 is 100 °C or more.

[0061] ・Condition (III): The volume resistivity measured according to JIS C2101:1999 is 1.0×10 7Above Ω·cm.

[0062] The lubricating oil composition of the present invention circulates in a circulation loop connected to at least a secondary battery, an electric motor, and a speed reducer, but the required characteristics of each device are different.

[0063] For example, the secondary battery is required to have high cooling performance and the characteristic of being able to keep the temperature of the secondary battery constant. On the other hand, since the electric motor and the speed reducer allow relatively high temperatures, the required cooling performance is not as high as that of the secondary battery, but safety and lubricating performance are required. In addition, for the lubricating composition circulating in the circulation loop connected to the secondary battery, the electric motor, and the speed reducer, high insulation is also required.

[0064] Thus, the performances required for the lubricating oil composition for cooling and / or lubricating the secondary battery, the electric motor, and the speed reducer are different. Therefore, different lubricating oil compositions have been used for each device so far, but the lubricating oil composition circulating in these devices needs to satisfy all the performances required by these devices.

[0065] Therefore, the lubricating oil composition of the present invention is adjusted in a manner that satisfies the above conditions (I) to (III).

[0066] Condition (I) stipulates the cooling performance of the lubricating oil composition. The lubricating oil composition that satisfies Condition (I) has high cooling performance, and in particular, can keep the temperature of the secondary battery constant.

[0067] From the above viewpoints, the rate of change of the silver rod temperature ΔT specified in Condition (I) can be set to 72 °C or higher, 74 °C or higher, or 76 °C or higher.

[0068] It should be noted that the rate of change of the silver rod temperature ΔT specified in Condition (I) can be increased by adjusting the kinematic viscosity of the lubricating oil composition to be low, but if the kinematic viscosity of the lubricating oil composition is set too low, it may be difficult to adjust to satisfy Condition (II).

[0069] Condition (II) stipulates the safety of the lubricating oil composition. For example, the electric motor may sometimes become temporarily hot, and at this time, the lubricating oil composition may catch fire. Condition (II) is a condition for ensuring the safety of the lubricating oil composition especially when used for lubricating the electric motor.

[0070] From the above viewpoints, the flash point specified in Condition (II) can be set to 110 °C or higher, 120 °C or higher, 130 °C or higher, 140 °C or higher, 150 °C or higher, 160 °C or higher, or 170 °C or higher.

[0071] It should be noted that the flash point specified in condition (II) can be increased by adjusting the kinematic viscosity of the lubricating oil composition to be high. However, if the kinematic viscosity of the lubricating oil composition is set too high, it may sometimes be difficult to adjust it to meet condition (I).

[0072] Condition (III) stipulates the insulating property of the lubricating oil composition. For the lubricating composition circulating in the circulation loop connected to the secondary battery, the electric motor, and the speed reducer, high insulating property is required.

[0073] From the above viewpoints, the volume resistivity specified in condition (III) can be set to 5.0×10 7 Ω·cm or more, 1.0×10 8 Ω·cm or more, 5.0×10 8 Ω·cm or more, or 1.0×10 9 Ω·cm or more.

[0074] It should be noted that the volume resistivity specified in condition (III) can be adjusted by selecting a base oil with low polarity as the base oil used in the lubricating oil composition.

[0075] From the viewpoint of adjusting to a lubricating oil composition that satisfies the above condition (II) and has excellent lubricating performance, the kinematic viscosity of the lubricating oil composition according to one embodiment of the present invention at 30 °C can be set to 5.0 mm 2 / s or more, 6.0 mm 2 / s or more, 7.0 mm 2 / s or more, 8.0 mm 2 / s or more, 9.0 mm 2 / s or more, 10.0 mm 2 / s or more, or 11.0 mm 2 / s or more. Additionally, from the viewpoint of adjusting to satisfy the above condition (I), it can be set to 40.0 mm 2 / s or less, 35.0 mm 2 / s or less, 30.0 mm 2 / s or less, 25.0 mm 2 / s or less, 20.0 mm 2 / s or less, or 15.0 mm 2 / s or less.

[0076] In particular, by adjusting the kinematic viscosity at 30°C to the above range, high cooling performance can be exerted on the secondary battery to keep the temperature of the secondary battery constant, and the cooling property and lubricating property for the electric motor and the speed reducer are also well maintained. Therefore, it can be a lubricating oil composition more suitable for use in a circulation loop connected to at least the secondary battery, the electric motor, and the speed reducer for at least controlling the temperatures of the secondary battery, the electric motor, and the speed reducer.

[0077] From the viewpoint of a lubricating oil composition adjusted to satisfy the above condition (II) and having excellent lubricating properties, the kinematic viscosity of a lubricating oil composition according to one embodiment of the present invention at 40°C can be set to 3.0 mm 2 / s or more, 4.0 mm 2 / s or more, 5.0 mm 2 / s or more, 6.0 mm 2 / s or more, 7.0 mm 2 / s or more, or 8.0 mm 2 / s or more. Further, from the viewpoint of being adjusted to satisfy the above condition (I), it can be set to 30.0 mm 2 / s or less, 25.0 mm 2 / s or less, 20.0 mm 2 / s or less, 15.0 mm 2 / s or less, or 10.0 mm 2 / s or less.

[0078] From the viewpoint of a lubricating oil composition adjusted to satisfy the above condition (II) and having excellent lubricating properties, the kinematic viscosity of a lubricating oil composition according to one embodiment of the present invention at 100°C can be set to 1.0 mm 2 / s or more, 1.2 mm 2 / s or more, 1.5 mm 2 / s or more, 1.7 mm 2 / s or more, 2.0 mm 2 / s or more, or 2.2 mm 2 / s or more. Further, from the viewpoint of being adjusted to satisfy the above condition (I), it can be set to 5.0 mm 2 / s or less, 4.5 mm 2 / s or less, 4.0 mm 2 / s or less, 3.5 mm 2 / s or less, or 3.0 mm 2 / s or less.

[0079] The viscosity index of a lubricating oil composition according to one embodiment of the present invention can be set to 70 or more, 80 or more, 90 or more, 100 or more, 110 or more, or 120 or more.

[0080] It should be noted that in this specification, the kinematic viscosity and viscosity index at each temperature refer to the values measured and calculated in accordance with JIS K2283:2000.

[0081] The transmittance of the lubricating oil composition according to one embodiment of the present invention can be set to 90% or more, 93% or more, 95% or more, or 97% or more.

[0082] It should be noted that in this specification, the transmittance of the lubricating oil composition refers to the value measured at a wavelength of 600 nm in accordance with JIS K0115.

[0083] The lubricating oil composition according to one embodiment of the present invention contains a base oil and may further contain a lubricating oil additive.

[0084] Hereinafter, the base oil and the lubricating oil additive that can be contained in the lubricating oil composition according to one embodiment of the present invention will be described.

[0085] <Base Oil>

[0086] As the base oil contained in the lubricating oil composition used in one embodiment of the present invention, one or more selected from mineral oils and synthetic oils can be cited.

[0087] As the mineral oil, for example, atmospheric residue obtained by atmospheric distillation of crude oils such as paraffin-based crude oil, intermediate-base crude oil, and naphthene-based crude oil can be cited; distillate oil obtained by vacuum distillation of these atmospheric residues; refined oil obtained by subjecting the distillate oil to one or more of refining treatments such as solvent deasphalting, solvent extraction, hydrocracking, solvent dewaxing, catalytic dewaxing, and hydrofining, etc.

[0088] As the synthetic oil, for example, polyalphaolefins such as alpha-olefin homopolymers or alpha-olefin copolymers (for example, alpha-olefin copolymers having 8 to 14 carbon atoms such as ethylene-alpha-olefin copolymers); isoparaffins; polyalkylene glycols; ester oils such as polyol esters, dibasic acid esters, and phosphates; ether oils such as polyphenylene ethers; alkylbenzenes; alkylnaphthalenes; synthetic oils (GTL) obtained by isomerizing wax (GTL wax (Gas To Liquids WAX)) produced from natural gas by the Fischer-Tropsch method, etc.

[0089] Among them, as the base oil used in one embodiment of the present invention, from the viewpoint of adjusting the lubricating oil composition to satisfy the above condition (III), a base oil with low polarity is preferred, and one or more selected from mineral oils and polyalphaolefins are more preferred.

[0090] In a lubricating oil composition according to one embodiment of the present invention, based on the total amount (100% by mass) of the lubricating oil composition, the content of the base oil can be set to 50% by mass or more, 60% by mass or more, 70% by mass or more, 75% by mass or more, 80% by mass or more, 85% by mass or more, 90% by mass or more, or 93% by mass or more. Additionally, it can be set to 100% by mass or less, 99% by mass or less, 98% by mass or less, or 97% by mass or less.

[0091] <Lubricating oil additive>

[0092] The lubricating oil composition used in one embodiment of the present invention may contain a lubricating oil additive together with the base oil according to the use within a range that does not impair the effects of the present invention.

[0093] Examples of the lubricating oil additive include a pour point depressant, a viscosity index improver, an extreme pressure agent, an antioxidant, a metal detergent, an ashless dispersant, an antiwear agent, an emulsifier, a friction modifier, a rust inhibitor, a metal deactivator, an antistatic agent, a defoaming agent, and the like.

[0094] These lubricating oil additives can be used individually or in combination of two or more.

[0095] As a specific embodiment, the lubricating oil composition used in one embodiment of the present invention may be a lubricating oil composition containing a base oil and one or more lubricating oil additives selected from an antiwear agent, a metal deactivator, a metal detergent, a dispersant, and a defoaming agent.

[0096] These lubricating oil additives can be appropriately prepared within a range that does not impair the effects of the present invention. Based on the total amount (100% by mass) of the lubricating oil composition, each additive is generally 0.001 to 15% by mass, preferably 0.005 to 10% by mass, and more preferably 0.01 to 5% by mass, independently.

[0097] 〔Circulating system〕

[0098] First, use Figure 1 The first embodiment of the present invention will be described. Figure 1Reference numeral 100 denotes a first circulation system installed in a vehicle 10. The vehicle 10 mainly includes a secondary battery 11, an electric motor 12, a speed reducer 13, and a PCU (Power Control Unit) 14. Around the secondary battery 11, a battery cooling jacket 111 is provided in close contact with the secondary battery 11. Around the electric motor 12 and the speed reducer 13, a motor cooling jacket 112 is provided in close contact with the electric motor 12 and the speed reducer 13 so as to enable heat exchange. Around the PCU 14, a PCU cooling jacket 141 is provided in close contact with components to be cooled in the PCU 14, such as semiconductors, so as to enable heat exchange. The battery cooling jacket 111, the motor cooling jacket 112, and the PCU cooling jacket 141 each include a jacket inlet 111a, 112a, 141a and a jacket outlet 111b, 112b, 141b, and are configured to be liquid-tight.

[0099] The first circulation system 100 mainly includes a battery cooling jacket 111, a motor cooling jacket 112, a PCU cooling jacket 141, a circulation circuit 120, an oil pump 130, an oil tank 140, and a radiator (oil cooler) 150.

[0100] The oil pump 130 is connected to the oil tank 140, and the oil tank 140 is connected to the radiator 150. The radiator 150 receives a lubricating oil composition and allows it to flow into an internal flow path, and brings wind or a liquid into contact with a plurality of fins in contact with the outside of the internal flow path to perform heat exchange with the lubricating oil composition, for example, cooling, and then sends it to the oil tank 140. The oil tank 140 receives the lubricating oil composition from the radiator 150 and stores it. The oil pump 130 pressurizes the lubricating oil composition in the oil tank 140 and sends it to the outside.

[0101] The circulation circuit 120 includes a first passage 121 connected to the secondary battery 11 and a second passage 122 connected to the electric motor 12 and the speed reducer 13, and is capable of circulating the lubricating oil composition.

[0102] The first passage 121 mainly includes a first inflow pipe 121a connecting the outlet of the oil pump 130 to the jacket inlet 111a of the battery cooling jacket 111, and a first outflow pipe 121b connecting the jacket outlet 111b of the battery cooling jacket 111 to the jacket inlet 141a of the PCU cooling jacket 141.

[0103] The second passage 122 mainly includes a second inflow pipe 122a connecting the outlet of the oil pump 130 to the jacket inlet 112a of the motor cooling jacket 112, and a second outflow pipe 122b connecting the jacket outlet 112b of the motor cooling jacket 112 to the inlet of the radiator 150.

[0104] The outlet 121d of the first passage 121 is connected to the jacket inlet 141a of the PCU cooling jacket 141. The jacket outlet 141b of the PCU cooling jacket 141 is connected to the inlet of the radiator 150. The outlet of the radiator 150 is connected to the inlet of the fuel tank 140. The outlet of the fuel tank 140 is connected to the inlet of the oil pump 130.

[0105] The outlet 122d of the second passage 122 is connected to the inlet of the radiator 150. The outlet of the radiator 150 is connected to the inlet of the fuel tank 140. The outlet of the fuel tank 140 is connected to the inlet of the oil pump 130. That is, the first passage 121 and the second passage 122, or the secondary battery 11 and the motor 12 and the speed reducer 13 are connected in parallel to the radiator 150, the fuel tank 140, and the oil pump 130. Both the first passage 121 and the second passage 122 are connected to the same or one radiator 150. In addition, both are connected to the same or one fuel tank 140, and both are connected to the same or one oil pump 130.

[0106] Next, the flow of the lubricating oil composition in the first circulation system 100 will be described.

[0107] The lubricating oil composition stored in the fuel tank 140 is pumped to the first passage 121 and the second passage 122 by the oil pump 130. The lubricating oil composition pumped to the second passage 122 flows into the motor cooling jacket 112 through the second inlet pipe 122a, cools the motor 12 and the speed reducer 13, and maintains a constant temperature. As a result, the temperature of the lubricating oil composition rises. Then, the lubricating oil composition is pumped to the radiator 150 through the second outlet pipe 122b. The radiator 150 cools the lubricating oil composition and sends it to the fuel tank 140. The temperature of the lubricating oil composition is kept constant by the radiator 150. On the other hand, the lubricating oil composition pumped from the fuel tank 140 to the first passage 121 flows into the battery cooling jacket 111 through the first inlet pipe 121a, and keeps the secondary battery 11 warm, that is, keeps the temperature of the secondary battery 11 constant. As described above, the lubricating oil composition in the fuel tank 140 is kept at a constant temperature by the radiator 150. Therefore, when the temperature of the secondary battery 11 is lower than the desired temperature, the secondary battery 11 can be heated, and when the temperature of the secondary battery 11 is higher than the desired temperature, the secondary battery 11 can be cooled. Then, the lubricating oil composition flows into the PCU cooling jacket 141 through the first outlet pipe 121b, cools the PCU 14, and maintains a constant temperature. As a result, the temperature of the lubricating oil composition rises. Then, the lubricating oil composition is pumped from the PCU cooling jacket 141 to the radiator 150. The radiator 150 cools the lubricating oil composition and sends it to the fuel tank 140. The temperature of the lubricating oil composition is kept constant by the radiator 150.

[0108] According to the first cooling system 100, the temperature of the secondary battery 11, the electric motor 12, and the reduction gear 13 can be controlled. More specifically, while cooling the electric motor 12 and the reduction gear 13, the temperature of the secondary battery 11 can be kept constant.

[0109] Use Figure 2 A description will be given of a second embodiment of the present invention. Figure 2 Fig. 200 shows a second cooling system 200 mounted on the vehicle 10. The same reference numerals are given to the same components as those in the first embodiment, and the description thereof will be omitted.

[0110] The second cooling system 200 mainly includes a battery cooling jacket 111, an electric motor cooling jacket 112, a PCU cooling jacket 141, a circulation circuit 220, a first oil pump 231, a second oil pump 232, an oil tank 140, and a radiator (oil cooler) 150.

[0111] The first oil pump 231 and the second oil pump 232 are connected to the oil tank 140, and press the lubricating oil composition in the oil tank 140 to the outside. The oil tank 140 is connected to the radiator 150, receives the lubricating oil composition from the radiator 150, and stores it. The radiator 150 receives and cools the lubricating oil composition, and delivers it to the oil tank 140.

[0112] The circulation circuit 220 includes a first passage 221 connected to the secondary battery 11, and a second passage 222 connected to the electric motor 12 and the reduction gear 13.

[0113] The first passage 221 mainly includes a first inflow leading pipe 221e connecting the outlet of the oil tank 140 to the inlet of the first oil pump 231, a first inflow following pipe 221a connecting the outlet of the first oil pump 231 to the jacket inlet 111a of the battery cooling jacket 111, and a first outflow pipe 221b connecting the jacket outlet 111b of the battery cooling jacket 111 to the jacket inlet 141a of the PCU cooling jacket 141.

[0114] The second passage 122 mainly includes a second inflow leading pipe 222e connecting the outlet of the oil tank 140 to the inlet of the second oil pump 232, a second inflow following pipe 222a connecting the outlet of the second oil pump 232 to the jacket inlet 112a of the electric motor cooling jacket 112, and a second outflow pipe 222b connecting the jacket outlet 112b of the electric motor cooling jacket 112 to the inlet of the radiator 150.

[0115] The outlet 221d of the first passage 221 is connected to the jacket inlet 141a of the PCU cooling jacket 141, the jacket outlet 141b of the PCU cooling jacket 141 is connected to the inlet of the radiator 150, and the outlet of the radiator 150 is connected to the inlet of the oil tank 140.

[0116] The outlet 222d of the second passage 222 is connected to the inlet of the radiator 150, and the outlet of the radiator 150 is connected to the inlet of the fuel tank 140. That is, the first passage 221 and the second passage 222, or the secondary battery 11 and the motor 12 and the speed reducer 13 are connected in parallel to the radiator 150 and the fuel tank 140. Both the first passage 221 and the second passage 222 are connected to the same or one radiator 150, and both are connected to the same or one fuel tank 140.

[0117] Next, the flow of the lubricating oil composition in the second circulation system 200 will be described.

[0118] The lubricating oil composition stored in the fuel tank 140 is respectively pumped to the first passage 221 and the second passage 222 by the first oil pump 231 and the second oil pump 232. The lubricating oil composition pumped to the second passage 222 flows into the motor cooling jacket 112 through the second inflow pre-tube 222e, the second oil pump 232, and the second inflow post-tube 222a, cools the motor 12 and the speed reducer 13 and maintains a constant temperature. Thus, the temperature of the lubricating oil composition rises. Then, the lubricating oil composition is pumped to the radiator 150 through the second outflow tube 222b. The radiator 150 cools the lubricating oil composition and sends it to the fuel tank 140. The temperature of the lubricating oil composition is kept constant by the radiator 150. On the other hand, the lubricating oil composition pumped from the fuel tank 140 to the first passage 121 flows into the battery cooling jacket 111 through the first inflow pre-tube 221e, the first oil pump 231, and the first inflow post-tube 221a, and keeps the secondary battery 11 warm, that is, keeps the temperature of the secondary battery 11 constant. As described above, the lubricating oil composition in the fuel tank 140 is kept at a constant temperature by the radiator 150. Therefore, when the temperature of the secondary battery 11 is lower than the desired temperature, the secondary battery 11 can be heated, and when the temperature of the secondary battery 11 is higher than the desired temperature, the secondary battery 11 can be cooled. Then, the lubricating oil composition flows into the PCU cooling jacket 141 through the first outflow tube 221b, cools the PCU 14 and maintains a constant temperature. Thus, the temperature of the lubricating oil composition rises. Then, the lubricating oil composition is pumped from the PCU cooling jacket 141 to the radiator 150. The radiator 150 cools the lubricating oil composition and sends it to the fuel tank 140. The temperature of the lubricating oil composition is kept constant by the radiator 150.

[0119] According to the second circulation system 200, the temperatures of the secondary battery 11, the motor 12, and the speed reducer 13 can be controlled. More specifically, the temperature of the secondary battery 11 can be kept constant while cooling the motor 12 and the speed reducer 13.

[0120] It should be noted that as Figure 3As shown, an oil cooler 251 can also be used instead of the radiator 150. A pump 233 is used to make, for example, a long-life coolant (LLC) or a refrigerant of an air conditioner flow into such an oil cooler 251 to cool the lubricating oil composition or keep the temperature constant.

[0121] Use Figure 4 A description will be given of the third embodiment of the present invention. Figure 4 Reference numeral 300 denotes a third circulation system mounted on a vehicle 10. The same components as those in the first and second embodiments are denoted by the same reference numerals and their description is omitted.

[0122] The third circulation system 300 mainly includes a battery cooling jacket 111, a motor cooling jacket 112, a PCU cooling jacket 141, a circulation circuit 320, an oil pump 130, a control valve 160, an oil tank 140, and a radiator (oil cooler) 150.

[0123] The control valve 160 is connected to the oil pump 130 and can open and close at least based on the temperatures of the lubricating oil composition, the secondary battery 11, the motor 12, the reduction gear 13, and / or the PCU 14, and pumps the lubricating oil composition into the first passage 121 and the second passage 122. In addition, the control valve 160 can open and close only based on the temperature of the secondary battery 11 or only based on the temperatures of the motor 12 and the reduction gear 13. The oil pump 130 is connected to the oil tank 140, and the oil tank 140 is connected to the radiator 150. The radiator 150 receives and cools the lubricating oil composition and delivers it to the oil tank 140. The oil tank 140 receives the lubricating oil composition from the radiator 150 and stores it. The oil pump 130 pumps the lubricating oil composition in the oil tank 140 to the outside.

[0124] The circulation circuit 120 includes a first passage 321 connected to the secondary battery 11 and a second passage 322 connected to the motor 12 and the reduction gear 13.

[0125] The first passage 321 mainly includes a first inflow pipe 321a that connects the outlet of the control valve 160 to the jacket inlet 111a of the battery cooling jacket 111, and a first outflow pipe 321b that connects the jacket outlet 111b of the battery cooling jacket 111 to the jacket inlet 141a of the PCU cooling jacket 141.

[0126] The second passage 322 mainly includes a second inflow pipe 322a that connects the outlet of the control valve 160 to the jacket inlet 112a of the motor cooling jacket 112, and a second outflow pipe 322b that connects the jacket outlet 112b of the motor cooling jacket 112 to the inlet of the radiator 150.

[0127] A control valve 160 is provided at the connection part of the first passage 321 and the second passage 322 to control the flow of the lubricating oil composition from the radiator (oil cooler) 150 to the first passage 321 and / or the second passage 322.

[0128] The outlet 321d of the first passage 321 is connected to the sleeve inlet 141a of the PCU cooling sleeve 141, the sleeve outlet 141b of the PCU cooling sleeve 141 is connected to the inlet of the radiator 150, the outlet of the radiator 150 is connected to the inlet of the fuel tank 140, and the outlet of the fuel tank 140 is connected to the inlet of the oil pump 130.

[0129] The outlet 322d of the second passage 322 is connected to the inlet of the radiator 150, the outlet of the radiator 150 is connected to the inlet of the fuel tank 140, and the outlet of the fuel tank 140 is connected to the inlet of the oil pump 130. That is, the first passage 321 and the second passage 322, or the secondary battery 11 and the motor 12 and the reducer 13 are connected in parallel to the oil pump 130, the fuel tank 140, and the radiator 150. Both the first passage 321 and the second passage 322 are connected to the same or one radiator 150, and further, both are connected to the same or one fuel tank 140, and both are connected to the same or one oil pump 130.

[0130] Next, the flow of the lubricating oil composition in the third circulation system 300 will be described.

[0131] The lubricating oil composition stored in the fuel tank 140 is pumped to the control valve 160 by the oil pump 130. The control valve 160 opens and closes at least based on the temperature of the lubricating oil composition, the secondary battery 11, the motor 12, the reducer 13, and / or the PCU 14, and pumps the lubricating oil composition to the first passage 121 and the second passage 122.

[0132] The control valve 160 can pump the lubricating oil composition into both or either of the first passage 121 and the second passage 122. In addition, the flow rates to the first passage 121 and the second passage 122 can be adjusted.

[0133] For example, when the temperatures of the secondary battery 11, the motor 12, the reducer 13, and the PCU 14 are higher than the desired temperature, the lubricating oil composition is delivered to the first passage 321 and the second passage 322 to lower the temperatures of the secondary battery 11, the motor 12, the reducer 13, and the PCU 14 to the desired temperature. At this time, the flow rates to the first passage 121 and the second passage 122 are adjusted according to the temperatures of these components.

[0134] For example, when the temperature of the secondary battery 11 is lower than the desired temperature and the temperature of the lubricating oil composition is higher than the desired temperature, the lubricating oil composition is delivered to the first passage 321 to raise the temperature of the secondary battery 11 to the desired temperature.

[0135] Thus, when the temperature of the secondary battery 11 is lower than the desired temperature, the secondary battery 11 can be heated, and when the temperature of the secondary battery 11 is higher than the desired temperature, the secondary battery 11 can be cooled.

[0136] According to the third circulation system 300, the temperatures of the secondary battery 11, the electric motor 12, and the speed reducer 13 can be controlled. More specifically, while cooling the electric motor 12 and the speed reducer 13, the temperature of the secondary battery 11 can be kept more precisely constant.

[0137] It should be noted that, as Figure 5 shown, an oil cooler 351 can also be used instead of the radiator 150. A pump 333 is used to make, for example, a long-life coolant (LLC) or a refrigerant of an air conditioner flow into such an oil cooler 351, and the lubricating oil composition is cooled or the temperature is kept constant via the oil cooler 351. In addition, besides this, as Figure 7 shown, a pump 333 can also be used to make a long-life coolant (LLC) or a refrigerant of an air conditioner flow into the PCU cooling jacket 141 to cool the PCU 14 or keep the temperature constant.

[0138] Use Figure 8 to describe the fourth embodiment of the present invention. Figure 8 Fig. 400 shows the fourth circulation system 400 installed in the vehicle 10. The same components as those in the first to third embodiments are denoted by the same reference numerals and their description is omitted.

[0139] The fourth circulation system 400 mainly includes a battery cooling jacket 111, an electric motor cooling jacket 112, a PCU cooling jacket 141, a circulation circuit 420, a first oil pump 431, a second oil pump 432, and a radiator (oil cooler) 150.

[0140] The first oil pump 231 and the second oil pump 232 are connected to the radiator 150 and press the lubricating oil composition supplied from the radiator 150 to the outside. The radiator 150 receives and cools the lubricating oil composition.

[0141] The circulation circuit 420 includes a first passage 421 connected to the secondary battery 11 and a second passage 422 connected to the electric motor 12 and the speed reducer 13.

[0142] The first passage 421 mainly includes a first inflow leading pipe 421e connecting the outlet of the radiator 150 to the inlet of the first oil pump 431, a first inflow subsequent pipe 421a connecting the outlet of the first oil pump 431 to the jacket inlet 111a of the battery cooling jacket 111, and a first outflow pipe 421b connecting the jacket outlet 111b of the battery cooling jacket 111 to the inlet a of the radiator 150.

[0143] The second passage 422 mainly includes a second inflow leading pipe 422e that connects the outlet of the radiator 150 to the inlet of the second oil pump 432, a second inflow subsequent pipe 422a that connects the outlet of the second oil pump 432 to the jacket inlet 112a of the motor cooling jacket 112, and a second outflow pipe 422b that connects the jacket outlet 112b of the motor cooling jacket 112 to the inlet of the radiator 150.

[0144] The outlet 421d of the first passage 421 and the outlet 422d of the second passage 222 are connected to the inlet of the radiator 150. That is, the first passage 421 and the second passage 422, or the secondary battery 11 and the motor 12 and the speed reducer 13 are connected in parallel to the radiator 150. Both the first passage 421 and the second passage 422 are connected to the same or one radiator 150.

[0145] A third passage 435 of a system different from the first passage 421 and the second passage 422 is connected to the radiator (oil cooler) 150. A pump 433, a PCU cooling jacket 141, and the radiator 150 are connected to the third passage. The pump 433 is used to make, for example, a long-life coolant (LLC) or a refrigerant of an air conditioner flow in the third passage, and the lubricating oil composition is cooled or the temperature is kept constant by means of the radiator (oil cooler) 150. In addition, the pump 433 is used to make the long-life coolant (LLC) or the refrigerant of the air conditioner flow into the PCU cooling jacket 141 to cool the PCU 14 or keep the temperature constant.

[0146] Next, the flow of the lubricating oil composition in the fourth circulation system 400 will be described.

[0147] The lubricating oil composition flowing out of the radiator 150 is respectively pressurized to the first passage 421 and the second passage 422 by the first oil pump 431 and the second oil pump 432. The lubricating oil composition pressurized to the second passage 422 flows into the motor cooling jacket 112 through the second inflow preceding pipe 422e, the second oil pump 432, and the second inflow subsequent pipe 422a, cools the motor 12 and the speed reducer 13 and maintains a constant temperature. Thus, the temperature of the lubricating oil composition rises. Then, the lubricating oil composition is pressurized to the radiator 150 through the second outflow pipe 422b. The radiator 150 cools and sends out the lubricating oil composition. The temperature of the lubricating oil composition is kept constant by the radiator 150. On the other hand, the lubricating oil composition pressurized from the radiator 150 to the first passage 421 flows into the battery cooling jacket 111 through the first inflow preceding pipe 421e, the first oil pump 431, and the first inflow subsequent pipe 421a, and keeps the secondary battery 11 warm, that is, keeps the temperature of the secondary battery 11 constant. As described above, since the lubricating oil composition is kept at a constant temperature by the radiator 150, the secondary battery 11 can be heated when the temperature of the secondary battery 11 is lower than the desired temperature, and the secondary battery 11 can be cooled when the temperature of the secondary battery 11 is higher than the desired temperature. Then, the lubricating oil composition flows into the radiator 150 through the first outflow pipe 421b. The radiator 150 cools and sends out the lubricating oil composition. The temperature of the lubricating oil composition is kept constant by the radiator 150.

[0148] According to the fourth circulation system 400, the temperatures of the secondary battery 11, the motor 12, and the speed reducer 13 can be controlled. More specifically, the temperature of the secondary battery 11 can be kept constant while cooling the motor 12 and the speed reducer 13.

[0149] Use Figure 9 The fifth embodiment of the present invention will be described. Figure 9 The fifth circulation system 500 mounted on the vehicle 10 is shown. The same components as those in the first to fourth embodiments are denoted by the same reference numerals and the description thereof is omitted.

[0150] The fifth circulation system 500 mainly includes a battery cooling jacket 111, a motor cooling jacket 112, a PCU cooling jacket 141, a circulation circuit 520, an oil pump 130, a fuel tank 140, a radiator (oil cooler) 150, and a control valve 560. The configurations and connection relationships of the oil pump 130, the fuel tank 140, and the radiator 150 are the same as those in the first embodiment, and thus the description thereof is omitted.

[0151] The circulation circuit 520 includes a first passage 521 connected to the secondary battery 11 and a second passage 522 connected to the motor 12 and the speed reducer 13, and can circulate the lubricating oil composition.

[0152] The first passage 521 mainly includes a first inflow pipe 521a that connects the outlet of the oil pump 130 to the sleeve inlet 111a of the battery cooling jacket 111, and a first outflow pipe 521b that connects the sleeve outlet 111b of the battery cooling jacket 111 to the sleeve inlet 141a of the PCU cooling jacket 141 via the control valve 560. The control valve 560 causes a part of the lubricating oil composition flowing in the secondary battery 11 to flow into the second passage 522. The outlet 521d of the first passage 521 is connected to the sleeve inlet 141a of the PCU cooling jacket 141, and the sleeve outlet 141b of the PCU cooling jacket 141 is connected to the inlet of the radiator 150.

[0153] The second passage 522 mainly includes a second inflow pipe 522a that connects the outlet of the control valve 560 to the sleeve inlet 112a of the motor cooling jacket 112, and a second outflow pipe 522b that connects the sleeve outlet 112b of the motor cooling jacket 112 to the inlet of the radiator 150. The outlet 522d of the second passage 522 is connected to the inlet of the radiator 150. That is, the secondary battery 11, the motor 12, and the speed reducer 13 are connected in series to the radiator 150, the oil tank 140, and the oil pump 130. In addition, the second passage 522 and the first outflow pipe 521b are connected in parallel to the PCU 14. The first passage 521 and the second passage 522 are both connected to the same or one radiator 150, and are both connected to the same or one oil tank 140, and are both connected to the same or one oil pump 130.

[0154] Next, the flow of the lubricating oil composition in the fifth circulation system 500 will be described.

[0155] The lubricating oil composition flowing out of the fuel tank 140 is pressurized by the oil pump 130 and sent to the first passage 521. The lubricating oil composition sent to the first passage 521 flows into the battery cooling jacket 111 through the first inflow pipe 521a to keep the secondary battery 11 warm, that is, to keep the temperature of the secondary battery 11 constant. The lubricating oil composition flowing out of the battery cooling jacket 111 flows into the control valve 560. The control valve 560 causes a part of the lubricating oil composition flowing out of the battery cooling jacket 111 to flow to the second passage 522. The lubricating oil composition sent to the second passage 522 flows into the motor cooling jacket 112 through the second inflow pipe 522a to cool the motor 12 and the speed reducer 13 and keep them at a constant temperature. Thus, the temperature of the lubricating oil composition rises. Then, the lubricating oil composition is pressurized by the oil pump 130 and sent to the radiator 150 through the second outflow pipe 522b. The radiator 150 cools and sends out the lubricating oil composition. The temperature of the lubricating oil composition is kept constant by the radiator 150. Then, the lubricating oil composition is sent to the battery cooling jacket 111 through the first passage 521 by the oil pump 130. As described above, since the temperature of the lubricating oil composition is kept constant by the radiator 150, when the temperature of the secondary battery 11 is lower than the desired temperature, the secondary battery 11 can be heated, and when the temperature of the secondary battery 11 is higher than the desired temperature, the secondary battery 11 can be cooled.

[0156] According to the fifth circulation system 500, the temperatures of the secondary battery 11, the motor 12, and the speed reducer 13 can be controlled. More specifically, the temperature of the secondary battery 11 can be kept constant while cooling the motor 12 and the speed reducer 13.

[0157] It should be noted that the fifth circulation system 500 may also be provided with an oil pump in the second inflow pipe 522a.

[0158] It should be noted that the first to fifth circulation systems 100 to 500 may also be provided with a secondary battery 11, a motor 12, a speed reducer 13, and a PCU (Power Control Unit) 14.

[0159] It should be noted that in the first to third and fifth circulation systems 100 to 300, 500, the case where the PCU 14 is cooled by the lubricating oil composition has been described. However, the PCU cooling jacket 141 may not be provided on the PCU 14, and the PCU 14 may not be cooled by the lubricating oil composition, but may be air-cooled (for example, as a modified example of the third circulation system, refer to Figure 6 )). At this time, the outlets 121d, 221d, 321d, 521d of the first passages 121, 221, 321, 521 are connected to the inlet of the radiator 150.

[0160] It should be noted that in any embodiment, it is preferred to install a filter capable of removing deposits from the lubricating oil composition after the motor cooling jacket 112 with respect to the flow direction of the lubricating oil composition.

[0161] It should be noted that in any embodiment, an oil cooler can also be used instead of the radiator. Such an oil cooler receives the lubricating oil composition and allows it to flow into an internal flow path, uses a pump to cause a long-life coolant (LLC) or a refrigerant of an air conditioner to flow and contact a plurality of fins in contact with the outside of the internal flow path, and exchanges heat with the lubricating oil composition, for example, for cooling or maintaining a constant temperature.

[0162] It should be noted that in this specification and the claims, the connection of the circulation loop to the secondary battery, the motor, and / or the speed reducer includes connecting to the battery cooling jacket and / or the motor cooling jacket respectively.

[0163] According to a suitable embodiment of the present invention, a lubricating oil composition and a circulation system using the lubricating oil composition can obtain a lubricating oil composition capable of controlling the temperatures of the secondary battery, the motor, and the speed reducer and a circulation system using the lubricating oil composition.

[0164] Examples

[0165] Next, the present invention will be described in more detail by way of examples, but the present invention is not limited by any of these examples. It should be noted that the measurement methods and evaluation methods for various physical properties are as described below.

[0166] (1) Kinematic viscosity, viscosity index

[0167] Measured and calculated according to JIS K2283: 2000.

[0168] (2) Silver rod temperature change amount ΔT

[0169] According to the "Cooling Performance Test Method: Method A" specified in JIS K2242: 2012, the silver rod is heated so that the initial surface temperature T0 of the silver rod becomes 200 ° C, and the heated silver rod is placed in the sample oil heated to 80 ° C, and the temperature T of the surface of the silver rod 12 seconds after the silver rod is placed is measured 12 (° C). Then, calculate T0 - T 12 As the silver rod temperature change amount ΔT.

[0170] (3) Flash point

[0171] Measured according to JIS K2265-4: 2007 by the Cleveland open cup method (C.O.C method).

[0172] (4) Volume resistivity

[0173] The measurement was carried out at a temperature of 80 °C and 250 V in accordance with JIS C2101:1999.

[0174] (5)Shell Wear Test

[0175] According to ASTM D2783, using a four-ball tester, the Shell wear test was carried out under the conditions of a rotational speed of 1800 rpm, a load of 392 N, an oil temperature of 80 °C, and a test time of 30 minutes, and the average value of the wear scar diameters of three 1 / 2-inch balls was calculated. The smaller the wear scar diameter, the more excellent the wear resistance can be said to be.

[0176] (6)Observation of the Appearance of the Lubricating Oil Composition

[0177] The lubricating oil composition to be measured was poured into a transparent test tube, and the appearance of the test tube was visually observed and evaluated according to the following criteria.

[0178] ・A: Transparent, no turbidity was observed.

[0179] ・F: Opaque, turbid.

[0180] (7)Transmittance of the Lubricating Oil Composition

[0181] According to JIS K0115, the transmittance of the lubricating oil composition to be measured was measured at a wavelength of 600 nm.

[0182] Examples 1 to 2, Comparative Examples 1 to 4

[0183] Base oils and additive mixtures of the types and blending amounts shown in Table 1 were added to prepare lubricating oil compositions. The details of each component used in the preparation of the lubricating oil compositions are as follows.

[0184] <Base Oil>

[0185] ・“Mineral Oil A”: A paraffinic mineral oil with a kinematic viscosity at 40 °C = 8.1 mm 2 / s.

[0186] ・“Mineral Oil B”: A paraffinic mineral oil with a kinematic viscosity at 40 °C = 1.6 mm 2 / s.

[0187] ・“Mineral Oil C”: A paraffinic mineral oil with a kinematic viscosity at 40 °C = 31.4 mm 2 / s.

[0188] ・“Mineral Oil D”: A paraffinic mineral oil with a kinematic viscosity at 40 °C = 44.4 mm 2 / s.

[0189] ・“Synthetic Oil”: A synthetic oil with a kinematic viscosity at 40 °C = 8.0 mm 2Polyalphaolefin of / s.

[0190] ・ "High-polarity base oil": Kinematic viscosity at 40 °C = 8.6 mm 2 / s of ethylene glycol.

[0191] <Additive mixture>

[0192] ・ "Additive mixture": An additive mixture obtained by mixing an extreme pressure agent, an antiwear agent, a metal deactivator, a detergent, a dispersant, and an antifoaming agent.

[0193] For the prepared lubricating oil composition, various physical properties (1) to (6) above are measured and evaluated. The results are shown in Table 1.

[0194]

Table 1

[0195]

[0196] From Table 1, it can be considered that the lubricating oil compositions of Examples 1 to 2 are lubricating oil compositions that satisfy conditions (I) to (III), circulate in a circulation loop connected to at least a secondary battery, an electric motor, and a speed reducer, and are suitable for use in controlling the temperature of at least the secondary battery, the electric motor, and the speed reducer.

[0197] Explanation of reference numerals

[0198] 100: Degradation measurement system

[0199] 10: Vehicle

[0200] 11: Secondary battery (battery)

[0201] 12: Electric motor

[0202] 13: Speed reducer

[0203] 14: PCU

[0204] 100: Circulation system

[0205] 111: Battery cooling jacket

[0206] 111a: Jacket inlet

[0207] 111b: Jacket outlet

[0208] 112: Electric motor cooling jacket

[0209] 112a: Jacket inlet

[0210] 112b: Jacket outlet

[0211] 120: Circulation loop

[0212] 121: First passage

[0213] 121a: First inflow pipe

[0214] 121b: Second outflow pipe

[0215] 121d: Outlet

[0216] 122: Second passage

[0217] 122a: Second inflow pipe

[0218] 122b: Second outflow pipe

[0219] 122d: Outlet

[0220] 130: Oil pump

[0221] 140: Fuel tank

[0222] 141: Cooling jacket

[0223] 141a: Jacket inlet

[0224] 141b: Jacket outlet

[0225] 150: Radiator (oil cooler)

[0226] 160: Control valve

[0227] 200: Second circulation system

[0228] 220: Circulation loop

[0229] 221: First passage

[0230] 221a: First inflow subsequent pipe

[0231] 221b: First outflow pipe

[0232] 221d: Outlet

[0233] 221e: First inflow preceding pipe

[0234] 222: Second passage

[0235] 222a: Second inflow subsequent pipe

[0236] 222b: Second outflow pipe

[0237] 222d: Outlet

[0238] 222e: Second inflow preceding pipe

[0239] 231: First oil pump

[0240] 232: Second oil pump

[0241] 233: Pump

[0242] 251: Oil cooler

[0243] 300: The 3rd circulation system

[0244] 320: Circulation loop

[0245] 321: The 1st passage

[0246] 321a: The 1st inflow pipe

[0247] 321b: The 1st outflow pipe

[0248] 321d: Outlet

[0249] 322: The 2nd passage

[0250] 322a: The 2nd inflow pipe

[0251] 322b: The 2nd outflow pipe

[0252] 322d: Outlet

[0253] 333: Pump

[0254] 351: Oil cooler

[0255] 400: The 4th circulation system

[0256] 420: Circulation loop

[0257] 421: The 1st passage

[0258] 421a: The 1st inflow subsequent pipe

[0259] 421b: The 1st outflow pipe

[0260] 421d: Outlet

[0261] 421e: The 1st inflow preceding pipe

[0262] 422: The 2nd passage

[0263] 422a: The 2nd inflow subsequent pipe

[0264] 422b: The 2nd outflow pipe

[0265] 422d: Outlet

[0266] 422e: The 2nd inflow preceding pipe

[0267] 431: The 1st oil pump

[0268] 432: The 2nd oil pump

[0269] 433: Pump

[0270] 435: The 3rd passageway

[0271] 500: The 5th circulation system

[0272] 520: Circulation loop

[0273] 521: The 1st passageway

[0274] 521a: The 1st inlet pipe

[0275] 521b: The 1st outlet pipe

[0276] 521d: Outlet

[0277] 522: The 2nd passageway

[0278] 522a: The 2nd inlet pipe

[0279] 522b: The 2nd outlet pipe

[0280] 522c: Outlet

[0281] 560: Control valve

Claims

1. A lubricating oil composition that circulates in a circulation loop connected at least to a secondary battery, an electric motor, and a speed reducer, and is used to control the temperature of at least the secondary battery, the electric motor, and the speed reducer. The surface temperature T of the silver rod 12 seconds after placing a silver rod with an initial surface temperature T0 of 200 °C into a lubricating oil composition at 80 °C is measured according to the "Cooling Performance Test Method: Method A" specified in JIS K2242:2012 12 , in °C, and the temperature change amount ΔT of the silver rod calculated based on T0 - T 12 is 70 °C or more, The flash point measured by the Cleveland open cup method (C.O.C method) according to JIS K2265-4:2007 is 100 °C or higher. The volume resistivity measured according to JIS C2101:1999 is 1.0×10 7 Ω·cm or more.

2. The lubricating oil composition according to claim 1, having a kinematic viscosity at 30 °C of 5.0 mm 2 / s to 40.0 mm 2 / s.

3. The lubricating oil composition according to claim 1 or 2, wherein, The lubricating oil composition contains a base oil and one or more lubricating oil additives selected from antiwear agents, metal deactivators, metal detergents, dispersants, and antifoaming agents.

4. The lubricating oil composition according to any one of claims 1 to 3, having a transmittance of 90% or higher.

5. A circulation system that includes a circulation loop connected at least to a secondary battery, an electric motor, and a speed reducer, the circulation loop being capable of circulating the lubricating oil composition according to any one of claims 1 to 4 and at least controlling the temperature of the secondary battery, the electric motor, and / or the speed reducer.

6. The circulation system according to claim 5, wherein The circulation loop further includes a first passage connected to the secondary battery and a second passage connected to the electric motor and the speed reducer.

7. The circulation system according to claim 6, wherein, Both the first passage and the second passage are connected to the same radiator.

8. The circulation system according to claim 6 or 7, wherein The first passage and the second passage are connected in parallel.

9. The circulation system according to claim 6 or 7, wherein At least a part of the circulation loop connects the secondary battery in series with the electric motor and the speed reducer.

10. The circulation system according to any one of claims 6 to 9, wherein, The first passage and / or the second passage is provided with an oil pump.

11. The circulatory system according to any one of claims 6 to 10, wherein, Both the first passage and the second passage are connected to the same fuel tank.

12. The circulatory system according to any one of claims 6 to 11, wherein, Both the first passage and the second passage are connected to the same oil pump.

13. The circulation system according to any one of claims 6 to 12 further includes a control valve provided at the connection portion of the first passage and the second passage.

14. The circulation system according to any one of claims 6 to 13 further includes a control valve that controls the flow of the lubricating oil composition from the oil cooler to the first passage and / or the second passage.

15. The circulation system according to claim 13 or 14, wherein, The control valve opens and closes according to the temperature of the secondary battery.

16. The circulatory system according to any one of claims 13 to 15, wherein, The control valve opens and closes according to the temperature of the electric motor and the speed reducer.

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