JP2018179127A - Lubricant heat-up device and lubricant heat-up method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lubricant heat-up device that can reliably raise temperature of lubricant even when there is a few elements to generate heat, and to provide a lubricant heat-up method.SOLUTION: A lubricant heat-up device 100 includes a heat transfer member 110 installed in the vicinity of a motor 200 to absorb waste-heat of the motor 200 and immersed into lubricant 111 to radiate the absorbed waste-heat to the lubricant, thereby reliably raising temperature of the lubricant by the waste-heat of the motor 200.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a lubricant temperature raising device and a lubricant temperature raising method.

  Conventionally, for example, according to Patent Document 1 below, ATF (Automatic Transmission Fluid: automatic transmission fluid) is supplied to the inside of a traveling motor, and ATF is stored as cooling oil 41 in the lower part of the internal space of the traveling motor It is described.

Japanese Patent Application Publication No. 2006-14438

  Recently, electric vehicles are spreading. In an electric car, the number of gears and clutches are smaller than in a car using an internal combustion engine, and there are few elements that generate heat, so there is a problem that the temperature of the ATF is hard to rise. Lubricating oil such as ATF has a problem that the spin loss (sliding resistance) of the gear increases at a low temperature because the viscosity increases as the temperature decreases.

  Therefore, the present invention has been made in view of the above problems, and the object of the present invention is to be able to reliably raise the temperature of the lubricating oil even when there are few elements generating heat. It is an object of the present invention to provide a new and improved lubricating oil temperature rising device and a lubricating oil temperature rising method.

  To solve the above problems, according to one aspect of the present invention, the exhaust heat of the motor which is disposed in the vicinity of the motor to absorb the exhaust heat of the motor and absorbed by the lubricating oil is absorbed by the motor. A lubricating oil temperature rising device is provided, which comprises a heat transfer member that releases heat to the lubricating oil.

  The heat transfer member is vertically moved between a first position immersed in the lubricating oil and a second position not immersed in the lubricating oil according to the temperature of the lubricating oil. It may be.

  Further, the heat storage device further includes a shape memory member at least a part of which is immersed in the lubricating oil and connected to the heat transfer member, and the shape memory member changes the shape according to the temperature of the lubricating oil. A shape memory member may be provided to move the transmission member between the first position and the second position.

  Further, the shape memory member extends in the vertical direction, and the length in the vertical direction changes according to the temperature of the lubricating oil, whereby the heat transfer member is moved from the first position to the second position. It may be pulled up.

  The shape memory member is configured to pull the heat transfer member from the first position to the second position by shortening the length in the vertical direction when the temperature of the lubricating oil decreases. Also good.

  Moreover, while connecting the said heat transfer member and the said shape memory member, the connection member which heat-insulates the said heat transfer member and the said shape memory member may be provided.

  The heat transfer member may have a shape for covering at least a part of the surface of the motor.

  The heat transfer member may have a first bent portion covering the upper corner of the motor and a second bent portion covering the lower corner of the motor.

  Further, the heat transfer member is formed of a plate material, and the heat transfer member is provided with a heat dissipation portion whose surface area is expanded by shearing the plate material or bending the plate material at a portion immersed in the lubricating oil of the heat transfer member. May be used.

  Also, the lubricating oil may lubricate a reduction gear driven by the motor.

  Further, it may be provided in a drive unit of a vehicle including the motor and the reduction gear.

  In order to solve the above problems, according to another aspect of the present invention, the heat exchange member immersed in the lubricating oil absorbs heat from the motor, and the heat exchange member absorbs the heat. And a step of dissipating the waste heat to the lubricating oil to raise the temperature of the lubricating oil.

  As described above, according to the present invention, it is possible to provide a lubricating oil temperature raising device and a lubricating oil temperature raising method capable of reliably raising the temperature of the lubricating oil even when the number of elements generating heat is small. Can.

It is a schematic diagram which shows the structure of a drive unit provided with the temperature rising apparatus which concerns on one Embodiment of this invention. It is a figure which shows the structure of a temperature rising apparatus and a motor, Comprising: It is a schematic diagram which shows the state which looked at the temperature rising apparatus from the side surface of a motor. It is a schematic diagram which shows the up-and-down motion of a heat transfer member. It is a schematic diagram which shows the structure for moving a heat transfer member up and down. It is a schematic diagram for demonstrating the structure of the heat transfer member for transmitting the exhaust heat of a motor to lubricating oil efficiently.

  The present invention will now be described more fully with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown. In the present specification and the drawings, components having substantially the same functional configuration will be assigned the same reference numerals and redundant description will be omitted.

  First, with reference to FIG. 1, a schematic configuration of a drive unit 1000 provided with a temperature rising device 100 according to an embodiment of the present invention will be described. FIG. 1 is a schematic view showing the configuration of the drive unit 1000. As shown in FIG. Drive unit 1000 is provided in the vehicle and outputs a driving force for driving the wheels. As shown in FIG. 1, the drive unit 1000 includes a temperature raising device 100, a motor 200, and a reduction gear 300. The temperature raising device 100, the motor 200, and the reduction gear 300 are stored in the case 1010 of the drive unit 1000. The reduction gear 300 includes a gear 310 provided on an output shaft 210 of the motor 200 and a gear 320 engaged with the gear 310. The gear 320 is provided on an output shaft 330 that transmits the output of the drive unit 1000 to the wheels. Due to the reduction gear 300, the rotational speed of the output shaft 330 is higher than that of the output shaft 210 of the motor 200.

  At the bottom of the case 1010, lubricating oil 111 is stored. A portion of the gear 320 is immersed in the lubricating oil 111. Thereby, the lubricating oil 111 is scraped up by the gear 320, and the gear 320 and the gear 310 are lubricated. The reduction gear 300 may be an automatic transmission (AT), and the lubricating oil 111 may be an automatic transmission fluid (ATF).

  A part of the temperature raising device 100 is immersed in the lubricating oil 111. The upper portion of the lubricating oil 111 is close to the coil end of the motor 200, and the exhaust heat from the coil end is transferred to the temperature raising device 100 and further transferred from the temperature raising device 100 to the lubricating oil 111. As a result, the temperature of the lubricating oil 111 is raised, and the spin loss (sliding resistance) in the drive unit 1000 is reduced. Although the motor 200 is used as a heat source in this embodiment, any heat source other than the motor 200 may be used as long as it generates heat.

  Next, with reference to FIG. 2, a schematic configuration of the temperature rising device 100 according to an embodiment of the present invention will be described. FIG. 2 is a view showing the configuration of the temperature raising device 100, the motor 200 and the periphery thereof, and is a schematic view showing the state where the temperature rising device 100 is viewed from the side of the motor 200.

  As shown in FIG. 2, the temperature raising device 100 is disposed adjacent to the motor 200. The temperature rising device 100 is configured to have a heat transfer member 110. The heat transfer member 110 is configured by, for example, pressing a copper plate. The thickness of the copper plate is, for example, about 3 mm or less. The heat transfer member 110 is disposed in the vicinity of the stator of the motor 200 and the coil end, and the lower portion of the heat transfer member 110 is immersed in the lubricating oil 111 to dissipate the motor exhaust heat received by the heat transfer member 120 into the lubricating oil 111. Can be used to raise the temperature. Since copper has a high thermal conductivity, is easy to receive heat, and is easy to transmit heat, the exhaust heat of the motor 200 can be efficiently transferred to the lubricating oil 111 by forming the heat transfer member 110 from a copper plate. In addition, if it is a substance with high thermal conductivity, you may use another material instead of a copper plate. An insulation distance is secured between the heat transfer member 110 and the motor 200.

  As shown in FIG. 2, a bent portion (first bent portion) 112 is formed in the upper portion of the heat transfer member 110, and the bent portion 112 is configured to cover the upper corner of the motor 200. Thus, the heat transfer member 110 can efficiently receive the exhaust heat from the coil end of the motor 200 in particular.

  Further, at the lower part of the heat transfer member 110, a plurality of heat radiating portions 114a and 114b for radiating heat to the lubricating oil 111 are provided. As an example, each heat radiation part 114a, 114b is comprised by fin shape. By providing the plurality of heat radiating portions 114a and 114b, the area in which the lubricating oil 111 and the heat transfer member 110 are in contact is expanded, and heat can be efficiently transferred to the lubricating oil 111. When the heat transfer member 110 is formed of a plate material having a thickness of about several millimeters, the plate material is sheared, and the plate material is bent as shown in FIG. 2 to provide the two heat radiation portions 114a and 114b. Only the surface area can be expanded. In addition, the plurality of heat radiation portions 114a and 114b may be configured by joining different fin-shaped parts by welding or the like. Further, the surface area can be expanded by forming a plurality of holes in the portion of the heat transfer member 110 to be immersed in the lubricating oil 111 or making the portion of the heat transfer member 110 to be immersed in the lubricating oil 111 uneven or wavy. It can also be done.

  A terminal block 220 is connected to the electrodes of the motor 200 via the bus bar 210. The terminal block 220 is connected to an external power supply (not shown) for driving the motor 200. Although FIG. 2 shows a configuration in which the bus bar 210 and the terminal block 220 are immersed in the lubricating oil 111, the bus bar 210 and the terminal block 220 may not be immersed in the lubricating oil 111.

  According to the configuration as described above, the temperature of the lubricating oil 111 can be raised by absorbing the exhaust heat from the motor 200 and transmitting the absorbed heat to the lubricating oil 111. Therefore, it is possible to reduce the spin loss of the gears in the drive unit 1000. In addition, the heat transfer member 110 receives the exhaust heat from the motor 200, whereby the motor 200 can be reliably cooled.

  Next, the structure of the temperature rising apparatus 100 which raises / lowers the heat transfer member 110 according to the temperature of the lubricating oil 111 is demonstrated. The temperature of the motor 200 rises to about 180 ° C. to 190 ° C., for example. According to the above-described configuration, the temperature of the lubricating oil 111 can be raised using exhaust heat of the motor 200. However, when the temperature of the lubricating oil 111 is, for example, about 140 ° C. or more, the lubricating oil 111 may be degraded. is there. Further, when the temperature of the lubricating oil 111 becomes excessively high, the heat exchange member 110 is also overheated, and the temperature difference between the heat exchange member 110 and the motor 200 is reduced, so that the cooling efficiency of the motor 200 is lowered. For this reason, in the present embodiment, when the heat transfer member 110 is driven up and down, and the temperature of the lubricating oil 111 is excessively raised, the temperature of the lubricating oil 111 is prevented by immersing the heat conducting member 110 in the lubricating oil 111. Suppress the rise.

  FIG. 3 is a schematic view showing the up and down movement of the heat transfer member 110. As shown in FIG. As shown in the left side of FIG. 3, when the lubricating oil 111 is at a low temperature, the heat transfer member 110 is lowered, and the heat radiating portions 114 a and 114 b are immersed in the lubricating oil 111. In this state, the bent portion 112 of the heat transfer member 110 approaches the upper corner of the motor 200. Thereby, the heat received by the heat transfer member 110 can be transmitted to the lubricating oil 111, and the temperature of the lubricating oil 111 can be raised. In addition, the heat transfer member 110 deprives the exhaust heat of the motor 200, whereby the motor 200 can be cooled.

  On the other hand, if exhaust heat of the motor 200 is constantly supplied to the lubricating oil 111 by the heat transfer member 110, the temperature of the lubricating oil 111 may become excessively high. Therefore, as shown in the right side of FIG. 3, when the temperature of the lubricating oil 111 becomes high, the heat transfer member 110 moves upward to a position where the heat radiating parts 114 a and 114 b are not immersed in the lubricating oil 111. As a result, excessive temperature increase of the lubricating oil 111 can be reliably suppressed. Also in the state of the drawing on the right side of FIG. 3, the heat transfer member 110 deprives the exhaust heat of the motor 200, whereby the motor 200 can be cooled.

  As described above, the spin loss of the reduction gear 300 can be reduced as the temperature of the lubricating oil 111 becomes higher, but when the temperature of the lubricating oil 111 becomes excessively high, the lubricating oil 111 is degraded. Further, when the lubricating oil 111 becomes high temperature, the heat exchange member 110 also becomes high temperature, and the cooling efficiency of the motor 200 is lowered. Therefore, by pulling up the heat transfer member 110 from the lubricating oil 111 when the temperature of the lubricating oil 111 reaches a certain value or more, the deterioration of the lubricating oil 111 can be suppressed and the cooling efficiency of the motor 200 can be enhanced.

  FIG. 4 is a schematic view showing a configuration for moving the heat transfer member 110 up and down. In FIG. 4, the diagram shown on the left side shows the case where the lubricating oil 111 is at a low temperature, and the diagram shown on the right side shows the case where the lubricating oil 111 is at a high temperature. As shown in FIG. 4, the temperature rising device 100 includes a shape memory alloy (shape memory member) 120 and a connection member 130 in addition to the heat transfer member 110. The upper end of the shape memory alloy 120 is fixed to the case 1010 of the drive unit 1000, and the lower end is immersed in the lubricating oil 111. The shape memory alloy 120 is made of, for example, a wire having a diameter of about several millimeters.

  The connecting member 130 connects the heat transfer member 110 and the shape memory alloy 120. Since the shape memory alloy 120 is always immersed in the lubricating oil 111 at the lower end, the temperature of the shape memory alloy 120 changes according to the temperature of the lubricating oil 111. As shown in the left side of FIG. 4, when the lubricating oil 111 is at a low temperature, the temperature of the shape memory alloy 120 is also at a low temperature, and the shape memory alloy 120 has a linear shape. On the other hand, as shown in the right side of FIG. 4, when the lubricating oil 111 is at high temperature, the temperature of the shape memory alloy 120 also becomes high, and the shape of the shape memory alloy 120 becomes coil spring shape above the connecting member 130. , The shape memory alloy 120 is shortened.

  Therefore, as shown in the left side of FIG. 4, the heat transfer member 110 is lowered by the linear shape of the shape memory alloy 120 when the temperature is low, and the heat radiating portions 114 a and 114 b of the heat transfer member 110 are lubricating oil 111. It will be in the state of being soaked. Further, as shown in the right side of FIG. 4, when the shape memory alloy 120 is in a coil spring shape at high temperature, the heat transfer member 110 ascends, and the heat radiating portions 114 a and 114 b of the heat transfer member 110 become lubricating oil 111. It will not be immersed. Thereby, the vertical movement of the heat transfer member 110 shown in FIG. 3 can be realized.

  The lower end of the shape memory alloy 120 is always immersed in the lubricating oil 111 even when there is a temperature change. Thereby, the shape of the shape memory alloy 120 changes in accordance with the temperature of the lubricating oil 111. In order to cause the shape memory alloy 120 to accurately reflect the temperature of the lubricating oil 111, it is desirable that the temperature of the shape memory alloy 120 is not affected by the temperature of the heat transfer member 110. For this reason, the connecting member 130 is preferably made of a heat insulating material.

  As described above, depending on the temperature of the lubricating oil 111, when the lubricating oil 111 is at a high temperature, the heat transfer member 110 is pulled up from the lubricating oil 111, so that only the necessary portion of the exhaust heat of the motor 200 is lubricated. Can be used to raise the temperature of the Thus, the temperature of the lubricating oil 111 can be controlled optimally without the temperature of the lubricating oil 111 rising more than necessary.

  Further, according to the configuration shown in FIG. 4, since the heat transfer member 110 is moved up and down by the shape memory alloy 120, no oil temperature sensor is required when the heat transfer member 110 is driven according to the temperature of the lubricating oil 111. Also, a drive device (such as a motor) for driving the heat transfer member 110 up and down is unnecessary. Therefore, the structure which moves the heat transfer member 110 up and down by simple structure is realizable.

  On the other hand, the configuration for moving the heat transfer member 110 up and down is not limited to the above-described configuration, and the temperature sensor detects the temperature of the lubricating oil 111 and drives a drive device such as a motor according to the detected temperature. The heat transfer member 110 may be driven up and down.

  FIG. 5 is a schematic view for explaining the configuration of the heat transfer member 110 for efficiently transferring the exhaust heat of the motor 200 to the lubricating oil 111. As shown in FIG. In FIG. 5, the diagram shown on the left side shows the case where the lubricating oil 111 is at a low temperature, and the diagram shown on the right side shows the case where the lubricating oil 111 is at a high temperature. As described above, the first bent portion 112 is formed on the heat transfer member 110. As shown in the left side of FIG. 5, when the lubricating oil 111 is at a low temperature and the heat transfer member 110 is lowered, the area A1 from the side surface to the upper surface of the upper corner of the motor 200 is a first bending It is covered by the part 112. Therefore, in a state where the heat conducting member 110 is lowered, the heat receiving range (heat receiving area) from the motor 200 is increased by the first bending portion 112, and the heat transfer member 110 efficiently receives the exhaust heat from the motor 200. can do.

  Further, a second bent portion 116 is formed in the heat transfer member 110 so as to cover the lower corner of the motor 200. As shown in the right side of FIG. 5, when the lubricating oil 111 is at a high temperature and the heat transfer member 110 is rising, the area A2 from the side surface to the upper surface of the lower corner of the motor 200 has a second bending It is covered by the part 116. Therefore, in the state where the heat conduction member 110 is rising, the heat receiving range from the motor 200 is increased by the bending portion 116, and the heat transfer member 110 can efficiently receive the exhaust heat from the motor 200.

  The first bent portion 112 and the second bent portion 116 are provided to face each other in the vertical direction of the heat transfer member 110, but similar bent portions can be provided also in the horizontal direction of the heat transfer member 110 . As a result, since the coil end of the motor 200 can be covered from the left and right in the horizontal direction, the exhaust heat from the motor 200 can be received more efficiently.

  As described above, according to the present embodiment, the exhaust heat of the motor 200 is transmitted to the heat transfer member 110, and the heat transfer member 110 is immersed in the lubricating oil 111 to raise the temperature for lubrication, thereby the drive unit 1000. It is possible to reduce the spin loss of the internal gear. Further, since the heat transfer member 110 absorbs the exhaust heat of the motor 200, the motor 200 can be cooled.

  Although the preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, the present invention is not limited to such examples. It is obvious that those skilled in the art to which the present invention belongs can conceive of various changes or modifications within the scope of the technical idea described in the claims. Of course, it is understood that these also fall within the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 100 Temperature rising apparatus 110 Heat exchange member 111 Lubricant oil 112 1st bending part 114a, 114b Heat dissipation part 116 2nd bending part 120 Shape memory alloy 1000 drive unit

Claims (12)

  A lubricant is provided, which is disposed in the vicinity of a motor to absorb the exhaust heat of the motor and which dissipates the exhaust heat of the motor absorbed and absorbed in the lubricating oil to the lubricating oil. Oil heating device.   The heat transfer member may vertically move between a first position immersed in the lubricating oil and a second position not immersed in the lubricating oil according to the temperature of the lubricating oil. The lubricating oil temperature rise device according to claim 1, characterized in that. And a shape memory member at least a part of which is immersed in the lubricating oil and connected to the heat transfer member;
The shape memory member includes a shape memory member for moving the heat transfer member between the first position and the second position by changing the shape according to the temperature of the lubricating oil. The lubricating oil temperature rising apparatus of claim 2.   The shape memory member extends in the vertical direction, and the length in the vertical direction changes according to the temperature of the lubricating oil, thereby pulling the heat transfer member from the first position to the second position. The lubricating oil temperature rising device according to claim 3 characterized by things.   The shape memory member is characterized in that the heat transfer member is pulled up from the first position to the second position by shortening of the length in the vertical direction when the temperature of the lubricating oil decreases. The lubricating oil temperature rising device according to claim 4.   The lubricating oil according to any one of claims 3 to 5, further comprising a connecting member for connecting the heat transfer member and the shape memory member and thermally insulating the heat transfer member and the shape memory member. Temperature rising device.   The lubricant heat-up device according to any one of claims 1 to 6, wherein the heat transfer member has a shape for covering at least a part of a surface of the motor.   8. The lubrication according to claim 7, wherein the heat transfer member has a first bent portion covering an upper corner of the motor and a second bent portion covering a lower corner of the motor. Oil heating device.   The heat transfer member is formed of a plate material, and a heat radiation portion having a surface area expanded by shearing the plate material or bending the plate material is provided at a portion of the heat transfer member to be immersed in the lubricating oil. The lubricating oil temperature rising apparatus in any one of the Claims 1-8 characterized by these.   The lubricating oil temperature raising device according to any one of claims 1 to 9, wherein the lubricating oil lubricates a reduction gear driven by the motor.   The lubricating oil temperature rising device according to claim 10 provided in a drive unit of vehicles including said motor and said reduction gear. A heat exchange member immersed in lubricating oil absorbs heat exhaust from the motor;
Radiating the exhaust heat of the motor absorbed by the heat exchange member to the lubricating oil to raise the temperature of the lubricating oil;
A lubricating oil temperature rising method comprising:

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