JP5157798B2 - Drive device - Google Patents

Description

  The present invention relates to a drive device in which a heat sensitive member is provided between an internal combustion engine and an electric motor.

  As this type of drive device, a drive device that drives a wheel with an electric motor is widely known. However, when driving a wheel with an electric motor, there is a problem that the electric motor needs to be cooled. Therefore, conventionally, a mechanism for cooling the electric motor has been proposed.

  For example, Patent Document 1 describes a configuration that detects the temperature of an in-wheel motor and the temperature of peripheral members, changes the contact area between the in-wheel motor and peripheral members, and releases the heat of the in-wheel motor to the outside. Yes. Patent Document 2 describes a configuration in which a fuel cell stack and a fuel heater are covered with a heat insulating material and are not cooled. Patent Document 3 describes a configuration in which an electric motor is attached in the swinging direction of the lower arm to reduce the moment of inertia and suppress the deterioration of the riding comfort of the vehicle and the grounding property of the wheels.

JP 2006-211764 A JP 2002-362470 A JP 2006-27529 A

  The configuration disclosed in Patent Document 1 changes the contact area between the in-wheel motor and the peripheral member while comparing the temperature of the in-wheel motor and the temperature of the peripheral member, and further occurs in the in-wheel motor. However, there is a possibility that heat conduction efficiency may be inferior because the heat is once stored and then conducted to the peripheral member side, and there is no description of a configuration in which heat is transmitted from an internal combustion engine to an in-wheel motor. Absent.

  In the configuration shown in Patent Document 2, the fuel cell stack and the fuel heater are covered with a heat insulating material, and the traveling wind discharge port is provided from the traveling wind inlet, so that the traveling wind flows. . However, since the fuel cell stack and the fuel heater are covered with the heat insulating material as described above, the cooling efficiency may not be improved.

  Further, the configuration shown in Patent Document 3 can move in the swinging direction of the lower arm, but cannot move in a direction perpendicular to the swinging direction of the lower arm. The distance is slightly shortened by the thermal expansion of the lower arm, and the thermal influence from the internal combustion engine is greatly affected. When the internal combustion engine is overheated and becomes high temperature, the electric motor is more greatly affected by heat than the internal combustion engine, so that there is a possibility that the electric motor becomes high temperature and a problem occurs.

  The present invention has been made paying attention to the above technical problem, and the electric effect of the electric motor can be reduced by adjusting the heat transfer from the internal combustion engine to the electric motor by the heat sensitive member. The purpose is to prevent the occurrence of problems due to high temperatures due to heating.

To achieve the above object, a first aspect of the invention, given an internal combustion engine to transmit power to one of the driving wheels, power to the wheels other than the drive wheels to which the power from the internal combustion engine is transmitted Ekatsu An electric motor that can be driven even when the internal combustion engine is stopped, and the internal combustion engine and the electric motor are arranged adjacent to each other, wherein the electric motor is connected to the internal combustion engine. movably disposed in a direction approaching or away from for, Shin and contraction by responding to the temperature of prior SL internal combustion engine, a thermally responsive member coupled to the electric motor, and said heat sensitive member and the electric motor A heat insulating material provided between the electric motor and the heat-sensitive member, and a guide portion that extends by heat transmitted from the electric motor and contacts the internal combustion engine and the electric motor. The temperature of the internal combustion engine is over Said motor said allowed et al is moved away from the internal combustion engine by said heat sensitive member when, and when the temperature of the motor is increased, and the internal combustion engine and the electric motor can heat transfer through the guide portion It is comprised so that it may be connected to, The drive device characterized by the above-mentioned.

  According to the invention of claim 1, by providing the heat sensitive member, the thermal influence from the internal combustion engine to the electric motor can be kept small by adjusting the transfer of heat from the internal combustion engine to the electric motor when the internal combustion engine is at a high temperature. it can.

Further, by providing a heat insulating material between the heat sensitive member and the electric motor, the internal combustion engine prevents direct contact between the heat sensitive member and the electric motor at a high temperature, thereby preventing heat transfer, and the electric motor has a high temperature. Can be suppressed.

  The best mode for carrying out the invention will be described below. FIG. 1 is a schematic front view schematically showing an embodiment of a drive device according to the present invention. In FIG. 1, reference numeral 1 denotes a drive device according to the present invention, which is disposed, for example, between an internal combustion engine mounted on a vehicle and wheels.

  A distance variable device 2, which is a heat sensitive member that expands and contracts in response to the temperature constituting the drive device 1, is disposed between the internal combustion engine 3 and the electric motor 4. The distance variable device 2 is formed in a spring shape, for example, a shape memory alloy that can be expanded and contracted by the amount of heat applied. An internal combustion engine 3 that transmits power to any one of the drive wheels and an electric motor 4 that supplies power to wheels 5 other than the drive wheels to which power is transmitted from the internal combustion engine 3 are provided. Are arranged adjacent to each other. The electric motor 4 is arranged so as to be movable in a direction approaching and separating from the internal combustion engine 3. Further, the distance that is the expansion / contraction value of the distance variable device 2 between the internal combustion engine 3 and the electric motor 4 is maintained by the degree of expansion / contraction in the direction of arrow a of the drive shaft 6 arranged between the electric motor 4 and the wheel 5. Be drunk.

  Accordingly, heat transfer from the internal combustion engine 3 to the electric motor 4 is performed when the internal combustion engine 3 is at a high temperature, so that the thermal influence is adjusted by the distance variable device 2. And the guide part 7 mentioned later is formed in the cylinder shape so that the distance variable apparatus 2 may be wrapped. The guide portion 7 is made of, for example, a shape memory alloy that is a heat sensitive member that expands and contracts in response to temperature. Further, the guide unit 7 is set shorter than the distance variable device 2. Further, as will be described later, a heat insulating material 8 is arranged between the distance variable device 2 and the electric motor 4. The heat insulating material 8 is made of, for example, hard urethane foam.

  The operation of the drive device 1 will be described. When the internal combustion engine 3 is rotating, the internal combustion engine 3 is heated. When the internal combustion engine 3 is heated, heat is transmitted to the distance variable device 2 and the distance variable device 2 is extended. The electric motor 4 is pushed toward the wheel 5 by the extension of the distance variable device 2. As a result, the distance between the internal combustion engine 3 and the electric motor 4 is greatly increased. Therefore, since the space between the internal combustion engine 3 and the electric motor 4 becomes large, the amount of inflow of air that is a cooling medium, for example, increases, and the electric motor 4 is efficiently cooled. Thereby, it can suppress that the electric motor 4 becomes high temperature. Since the heat insulating material 8 is provided on the motor 4 side of the distance variable device 2 that connects the internal combustion engine 3 and the electric motor 4, the heat of the internal combustion engine 3 is not transmitted to the electric motor 4.

  Next, a second embodiment will be described. Here, FIG. 2 is a schematic partial sectional view schematically showing a second embodiment of the driving apparatus according to the present invention. In FIG. 2, the same components as those shown in the first embodiment are denoted by the same reference numerals. When the internal combustion engine 3 is still at a low temperature, the vehicle travels on an electric vehicle (EV) that is electrically driven. Therefore, since the heat from the internal combustion engine 3 is not generated when the internal combustion engine 3 is stopped, the distance variable device 2 does not extend due to thermal expansion. Therefore, the distance variable device 2 does not push the electric motor 4 toward the wheel 5 side. At this time, the distance between the internal combustion engine 3 and the electric motor 4 is not set long. Further, when only the electric motor 4 becomes high temperature, the guide portion 7 of the distance variable device 2 extends and comes into contact with the internal combustion engine 3 and the electric motor 4. The guide portion 7 is formed in a cylindrical shape so as to wrap the distance variable device 2. Therefore, when the internal combustion engine 3 is at a lower temperature than the electric motor 4, the internal combustion engine 3 is effectively used as a heat receiving member of the electric motor 4 through the guide portion 7, so that the electric motor 4 can be efficiently cooled. And since the variable distance apparatus 2 is connected with the electric motor 4 via the above-mentioned heat insulating material 8, it does not extend.

  Next, when the internal combustion engine 3 reaches a high temperature due to overheating or the like, a distance variable device 2 formed of, for example, a shape memory alloy, which is a heat sensitive member that expands and contracts in response to the temperature as shown in FIG. The electric motor 4 is pushed toward the wheel 5 in the direction of arrow b. As a result, the drive shaft 6 is pushed by the electric motor 4 and contracts to the wheel 5 side. Therefore, the distance between the internal combustion engine 3 and the electric motor 4 is greatly increased. For this reason, since air or the like as a cooling medium easily flows in, the thermal influence from the internal combustion engine 3 to the electric motor 4 can be reduced.

  Further, the heat transfer from the internal combustion engine 3 to the electric motor 4 can be prevented by installing the heat insulating material 8 between the electric motor 4 and the distance variable device 2. Since the motor 4 can be efficiently cooled by taking a large air layer between the internal combustion engine 3 and the motor 4, it is possible to prevent a failure due to heating of the motor 4. Furthermore, the influence of heat due to external factors that cannot be avoided even if the motor 4 itself is stopped can be suppressed.

1 is a schematic front view schematically showing an embodiment of a drive device according to the present invention. FIG. 5 is a schematic partial cross-sectional view schematically showing a second embodiment of the drive device according to the present invention. It is a block diagram which shows typically the Example of the drive device which concerns on this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Drive device, 2 ... Distance variable device, 3 ... Internal combustion engine, 4 ... Electric motor, 5 ... Wheel, 6 ... Drive shaft, 7 ... Guide part, 8 ... Heat insulation material.

Claims (1)

An internal combustion engine to transmit power to one of the drive wheels, the motive force from the internal combustion engine is driven even when Ekatsu the internal combustion engine given power to the wheels other than the drive wheels to be transmitted is down In a drive device in a vehicle provided with an electric motor capable of
The electric motor is arranged to be movable in a direction approaching / separating from the internal combustion engine ,
Shin and contraction by responding to the temperature of prior SL internal combustion engine, a thermally responsive member coupled to the electric motor,
A heat insulating material provided between the electric motor and the heat sensitive member, and preventing heat transfer between the electric motor and the heat sensitive member;
A guide portion that extends by heat transmitted from the electric motor and contacts the internal combustion engine and the electric motor;
With
It said motor is the so et al is moved away from the internal combustion engine by said heat sensitive member when the temperature of the pre-SL engine rises, when the temperature of the motor rises, the internal combustion engine and said and said electric motor A drive device that is configured to be coupled so as to be capable of transferring heat through a guide portion .

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