CN214564592U - Vehicle drive device - Google Patents
Vehicle drive device Download PDFInfo
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- CN214564592U CN214564592U CN202120399606.2U CN202120399606U CN214564592U CN 214564592 U CN214564592 U CN 214564592U CN 202120399606 U CN202120399606 U CN 202120399606U CN 214564592 U CN214564592 U CN 214564592U
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Abstract
A vehicle drive device capable of connecting a heat exchanger and a power conversion device in parallel in a temperature control circuit without complicating the piping structure. The vehicle driving device includes a first temperature control circuit, a second temperature control circuit, and a heat exchanger. The second temperature control circuit has a pressure feed passage and a power converter temperature control passage. The heat exchanger has a heat exchanger inlet port and a heat exchanger outlet port branched in three directions. The heat exchanger inlet port is connected to a downstream end of the pressurized transport flow path at an inlet side first branch path, the inlet side second branch path is connected to an upstream end of the power converter temperature adjustment flow path, the heat exchanger outlet port is connected to a downstream end of the power converter temperature adjustment flow path at an outlet side first branch path, and the outlet side second branch path is connected to an upstream end of the pressurized transport flow path.
Description
Technical Field
The present invention relates to a vehicle drive device mounted on a vehicle, and more particularly to a vehicle drive device provided with a temperature control circuit.
Background
Conventionally, there is known a vehicle such as an electric vehicle, which is mounted with a vehicle driving device including a rotating electric machine and a power conversion device for controlling the rotating electric machine. In general, since the rotating electrical machine and the power conversion device generate heat during operation, the vehicle driving device includes a temperature control circuit that performs temperature control of the rotating electrical machine and the power conversion device. For example, patent document 1 discloses a vehicle driving apparatus including a temperature control circuit having a circulation path L through which oil circulates to cool a motor M, a circulation path F through which cooling water circulates to cool an inverter U that controls the motor M, and a heat exchanging portion (oil cooler C) that exchanges heat between the cooling water flowing through the circulation path F and oil flowing through the circulation path L.
In the vehicle driving device of patent document 1, a radiator R is provided on the circulation path F, and the cooling water flowing through the circulation path F is cooled by the radiator R. The oil flowing through the circulation line L is cooled at the heat exchanging portion (oil cooler C) by exchanging heat between the cooling water flowing through the circulation line F and the oil flowing through the circulation line L. Therefore, the vehicle driving device of patent document 1 does not require a radiator for cooling the oil, and can cool the cooling water flowing through the circulation path F and the oil flowing through the circulation path L with one radiator, so that the vehicle driving device can be downsized.
Prior art documents
Patent document 1: japanese laid-open patent publication No. 2001-238406
On the other hand, in the vehicle driving device of patent document 1, when the temperature of the oil circulating in the circulation path L is lowered, the viscosity of the oil becomes high. Since the oil flows through the motor M, when the viscosity becomes high, the friction loss generated in the motor M increases, and the output efficiency of the motor M decreases. Therefore, when the temperature of the oil is equal to or lower than a predetermined temperature without the motor M becoming high, such as when the vehicle is started, the oil is not cooled, and is preferably not cooled.
However, in the vehicle driving device of patent document 1, since the heat exchanging portion (oil cooler C) and the inverter U are connected in series in the circulation path F, even when the temperature of the oil is equal to or lower than a predetermined temperature, cooling water is circulated in the circulation path F to cool the inverter U. Therefore, there are problems as follows: even when the temperature of the oil is equal to or lower than the predetermined temperature, the cooling water circulates through the circulation path F, and the oil flowing through the circulation path L at the heat exchanging portion (oil cooler C) is cooled.
On the other hand, there are problems as follows: in the circulation path F, when the heat exchanging portion (oil cooler C) and the inverter U are connected in parallel, the piping structure becomes complicated.
SUMMERY OF THE UTILITY MODEL
The utility model provides a vehicle drive device, it can not make the piping structure complicated just can parallel connection heat exchanger and power conversion device in the temperature regulation return circuit.
The utility model discloses a vehicle drive device possesses:
a rotating electric machine;
a power conversion device that controls the rotating electric machine; and
a temperature control circuit that controls the temperature of the rotating electrical machine and the temperature of the power conversion device,
the temperature regulation circuit has:
a first temperature control circuit in which a first temperature control medium circulates, the first temperature control circuit being configured to control the temperature of the rotating electrical machine;
a second temperature control circuit in which a second temperature control medium different from the first temperature control medium circulates, the second temperature control circuit being configured to control the temperature of the power conversion device; and
a heat exchanger that exchanges heat between the first temperature adjustment medium and the second temperature adjustment medium,
the second temperature regulation circuit has:
a pressurized delivery flow path provided with a radiator and a pump; and
a power conversion device temperature adjustment flow path provided with the power conversion device,
the heat exchanger has:
a heat exchanger main body portion that exchanges heat between the first temperature adjustment medium and the second temperature adjustment medium;
a heat exchanger introduction port that introduces the second temperature adjustment medium into the heat exchanger main body portion; and
a heat exchanger discharge port that discharges the second temperature adjustment medium flowing through the heat exchanger main body portion from the heat exchanger main body portion,
the heat exchanger inlet port includes an inlet side branch portion, a medium inlet passage connecting the heat exchanger main body portion and the inlet side branch portion, an inlet side first branch extending from the inlet side branch portion, and an inlet side second branch extending from the inlet side branch portion, and the heat exchanger inlet port branches in three directions,
the heat exchanger discharge port includes a discharge-side branch portion, a medium discharge path connecting the heat exchanger main body portion and the discharge-side branch portion, a discharge-side first branch path extending from the discharge-side branch portion, and a discharge-side second branch path extending from the discharge-side branch portion, and the heat exchanger discharge port is branched in three directions,
a downstream end of the pressurized transport passage is connected to the introduction-side first branch passage,
an upstream end of the power converter temperature control flow path is connected to the introduction-side second branch path,
a downstream end of the power converter temperature adjustment flow path is connected to the discharge-side first branch path,
the discharge-side second branch passage is connected to an upstream end of the pressurized-delivery passage.
Effect of the utility model
According to the utility model discloses, the second temperature regulation return circuit is branched into the flow path through the heat exchanger main part and is passed through power conversion device's flow path at the leading-in port branch of heat exchanger, joins at the heat exchanger discharge port department of heat exchanger at the leading-in port branch's of heat exchanger flow path through the heat exchanger main part of heat exchanger and the flow path through power conversion device of heat exchanger. Therefore, in the second temperature control circuit, the heat exchanger and the power conversion device can be connected in parallel without providing a branching portion and a merging portion in the pressure feed flow path and the power conversion device temperature control flow path. Thus, the heat exchanger and the power conversion device can be connected in parallel in the temperature control circuit without complicating the piping structure.
Drawings
Fig. 1 is a system block diagram of a vehicle drive device according to an embodiment of the present invention.
Fig. 2 is a perspective view showing a main part of a vehicle driving device according to an embodiment of the present invention.
Fig. 3 is a view of a main part of a vehicle drive device according to an embodiment of the present invention, as viewed from the front of the vehicle.
Fig. 4 is a perspective view of a heat exchanger of a vehicle driving device according to an embodiment of the present invention.
Description of reference numerals:
10a vehicle drive device;
20 electric motors (rotating electric machines);
50 Power Conversion Unit (PCU);
51a power conversion device main body section;
521 power conversion device inlet port;
522 a power conversion device discharge port;
60 a temperature regulation loop;
61 a first temperature regulation loop;
62 a second temperature regulation loop;
620a pressurizing and conveying flow path;
620b power converter temperature adjustment flow path;
621a second pump (EWP: pump);
622 heat sink (Radiator);
63 a heat exchanger;
630a heat exchanger body portion;
631a heat exchanger inlet port;
631a an introduction-side branching portion;
631b0 medium introduction path;
631b1 leading-in side first branch;
631b2 lead-in side second branch;
631c an introduction-side flow rate adjusting means (flow rate adjusting means);
632 heat exchanger discharge port;
632a discharge-side branch portion;
632b0 medium discharge path;
632b1 discharge side first branch;
632b2 discharge side second branch;
632c a discharge-side flow rate adjustment means (flow rate adjustment means);
70a rotary motor housing;
a TCM1 first temperature regulating medium;
TCM2 second temperature regulating medium;
v vehicle.
Detailed Description
Hereinafter, an embodiment of a vehicle mounted with a vehicle driving device according to the present invention will be described with reference to the drawings. It should be noted that the drawings are viewed in the direction of the reference numerals. In the present specification and the like, for the sake of simplicity and clarity of explanation, the front-rear, left-right, and up-down directions are described in terms of directions viewed from the driver of the vehicle, and in the drawings, the front of the vehicle is denoted by Fr, the rear is denoted by Rr, the left is denoted by L, the right is denoted by R, the upper is denoted by U, and the lower is denoted by D.
As shown in fig. 1, a vehicle drive device 10 according to the present embodiment is mounted on a vehicle V, and includes an internal combustion engine ICE, an electric motor (TRC)20, a Generator (GEN)30, a transmission (Gear)40, a power conversion device 50, a temperature control circuit 60, and a rotary electric machine housing 70.
The electric motor 20 is a rotating electric machine that outputs power for driving the vehicle V by electric power stored in an unillustrated power storage device mounted on the vehicle V or electric power generated by the generator 30. The electric motor 20 can generate electric power by kinetic energy of the drive wheels of the vehicle V to charge the above-described power storage device when the vehicle V is braked.
The generator 30 is a rotating electric machine that generates electric power by the power of an internal combustion engine ICE mounted on the vehicle V, and charges the power storage device or supplies electric power to the electric motor 20.
The transmission 40 is a device that decelerates the power output from the electric motor 20 and transmits it to the drive wheels, and is, for example, a gear-type power transmission device.
The Power conversion device 50 includes a Power Drive Unit (PDU), not shown, that converts the electric Power output from the Power storage device from dc to ac to Control the input/output Power of the motor 20 and the generator 30, and a Voltage Control Unit (VCU), not shown, that boosts the electric Power output from the Power storage device. In the case where the motor 20 generates power when the vehicle V brakes, the VCU may step down the power generated by the motor 20.
The temperature control circuit 60 includes a first temperature control circuit 61 in which a non-conductive first temperature control medium TCM1 circulates to adjust the temperature of the motor 20, the generator 30, and the transmission 40, a second temperature control circuit 62 in which a conductive second temperature control medium TCM2 circulates to adjust the temperature of the power conversion device 50, and a heat exchanger 63 that exchanges heat between the first temperature control medium TCM1 and the second temperature control medium TCM 2. The non-conductive first temperature control medium TCM1 is, for example, an oil called ATF (Automatic Transmission Fluid) that can lubricate and control the temperature of the motor 20, the generator 30, and the Transmission 40. The conductive second temperature control medium TCM2 is cooling water called LLC (Long Life Coolant).
The first temperature control circuit 61 is provided with a first pump (MOP)611 and a reservoir 612. The first pump 611 is a mechanical pump driven by the power of the internal combustion engine ICE and the rotational force of an axle, not shown, of the vehicle V. The storage portion 612 stores the first temperature adjustment medium TCM1 circulating in the first temperature adjustment circuit 61. The storage portion 612 is, for example, an oil pan provided at the bottom of the rotary electric machine case 70 (see fig. 2 and 3) that houses the electric motor 20, the generator 30, and the transmission 40. The first temperature control circuit 61 has a branch portion 613. The first temperature regulation circuit 61 has: a pressure feed channel 610a provided with a first pump 611, an upstream end of which is connected to the reservoir 612 and a downstream end of which is connected to the branch 613 by the first pump 611; a first branch flow passage 610b1 provided with the motor 20 and the generator 30, having an upstream end connected to the branch portion 613 and a downstream end connected to the storage portion 612 via the motor 20 and the generator 30; and a second branch flow passage 610b2 provided with the speed change device 40, having an upstream end connected to the branch portion 613, and a downstream end connected to the reservoir portion 612 via the speed change device 40. In the first temperature control circuit 61, the heat exchanger 63 is disposed upstream of the motor 20 and the generator 30 in the first branch flow passage 610b 1.
Therefore, the first temperature control circuit 61 is formed with: a flow path in which the first temperature control medium TCM1 pressurized and fed from the first pump 611 passes from the branching portion 613 through the first branch flow path 610b1, exchanges heat with the second temperature control medium TCM2 at the heat exchanger 63, is cooled, is supplied to the motor 20 and the generator 30, lubricates and temperature-controls the motor 20 and the generator 30, and is stored in the storage portion 612; and a flow path in which the first temperature adjustment medium TCM1 pressure-fed from the first pump 611 is supplied from the branch portion 613 to the transmission device 40 through the second branch flow path 610b2, lubricates and temperature-adjusts the transmission device 40, and then is stored in the storage portion 612, the first temperature adjustment medium TCM1 stored in the storage portion 612 flows through the pressure-feeding flow path 610a and is supplied to the first pump 611, and the first temperature adjustment medium TCM1 circulates in the first temperature adjustment circuit 61.
In the present embodiment, the first branch flow passage 610b1 and the second branch flow passage 610b2 are formed such that the flow rate of the first temperature control medium TCM1 flowing through the first branch flow passage 610b1 is larger than the flow rate of the first temperature control medium TCM1 flowing through the second branch flow passage 610b 2.
The first temperature control circuit 61 further includes a pressure regulating circuit 610c, and an upstream end of the pressure regulating circuit 610c is connected to the reservoir 612 and a downstream end thereof is connected to the pressure feed passage 610a at a position downstream of the first pump 611. The pressure regulating circuit 610c is provided with a pressure regulating valve 619. The pressure regulating valve 619 may be a check valve or an electromagnetic valve such as a solenoid valve.
When the hydraulic pressure of the first temperature-adjusting medium TCM1 pressurized and fed from the first pump 611 becomes equal to or higher than a predetermined upper limit pressure, the pressure-regulating valve 619 opens, and a part of the first temperature-adjusting medium TCM1 pressurized and fed from the first pump 611 returns to the reservoir 612. Thereby, the hydraulic pressure of the first temperature adjustment medium TCM1 flowing through the first branch flow passage 610b1 and the second branch flow passage 610b2 is kept at the upper limit pressure or lower.
As shown in fig. 1 to 3, the second temperature control circuit 62 is provided with a second pump 621, a radiator 622, and a storage TANK (Ex TANK) 623. The second pump 621 is, for example, an electric pump driven by the electric power stored in the power storage device. The radiator 622 is a heat sink that is disposed in the front portion of the vehicle V and cools the second temperature adjustment medium TCM2 by the traveling wind when the vehicle V travels. The storage tank 623 is a tank that temporarily stores the second temperature regulation medium TCM2 circulating in the second temperature regulation circuit 62. Even if cavitation is generated in the second temperature adjustment medium TCM2 circulating in the second temperature adjustment circuit 62, the cavitation generated in the second temperature adjustment medium TCM2 is eliminated by temporarily storing the second temperature adjustment medium TCM2 circulating in the second temperature adjustment circuit 62 in the storage tank 623.
The second temperature control circuit 62 includes a pressure feed passage 620a in which the storage tank 623, the second pump 621, and the radiator 622 are provided in this order from the upstream side, and a power converter temperature control passage 620b in which the power converter 50 is provided. The pressure feed passage 620a and the power converter temperature adjustment passage 620b are formed of pipes. The details of the pipes forming the pressure feed passage 620a and the power converter temperature adjustment passage 620b will be described later.
As shown in fig. 1 and 4, the heat exchanger 63 includes a heat exchanger main body portion 630 that exchanges heat between the first temperature control medium TCM1 and the second temperature control medium TCM2, a heat exchanger inlet port 631 that introduces the second temperature control medium TCM2 into the heat exchanger main body portion 630, and a heat exchanger outlet port 632 that discharges the second temperature control medium TCM2 flowing through the heat exchanger main body portion 630 from the heat exchanger 63.
The heat exchanger inlet port 631 has an inlet side branch portion 631 a. The heat exchanger inlet port 631 includes a medium inlet channel 631b0 connecting the heat exchanger body 630 and the inlet side branch 631a, an inlet side first branch 631b1 extending from the inlet side branch 631a, and an inlet side second branch 631b2 extending from the inlet side branch 631a, and has a T-shape branching in three directions from the inlet side branch 631 a.
The heat exchanger discharge port 632 includes a discharge-side branch portion 632a, a medium discharge path 632b0 connecting the heat exchanger main body portion 630 and the discharge-side branch portion 632a, a discharge-side first branch 632b1 extending from the discharge-side branch portion 632a, and a discharge-side second branch 632b2 extending from the discharge-side branch portion 632a, and has a T-shape branching in three directions from the discharge-side branch portion 632 a.
The downstream end of the pressurized transport passage 620a is connected to the inlet-side first branch 631b1 of the heat exchanger inlet port 631, and the upstream end of the power converter temperature adjustment passage 620b is connected to the inlet-side second branch 631b2 of the heat exchanger inlet port 631.
The downstream end of the power converter temperature adjustment flow path 620b is connected to the discharge side first branch 632b1 of the heat exchanger discharge port 632, and the upstream end of the pressure feed flow path 620a is connected to the discharge side second branch 632b2 of the heat exchanger discharge port 632.
Therefore, the second temperature control medium TCM2 pressure-fed by the second pump 621 and cooled by the radiator 622 in the pressure-feed flow path 620a branches into: a flow path leading from the leading-side first branch 631b1 to the heat exchanger main body 630 through the medium leading path 631b0 at the heat exchanger leading port 631 of the heat exchanger 63; and a flow path which flows from the introduction side first branch 631b1 through the introduction side second branch 631b2 in the power converter temperature adjustment flow path 620b and is supplied to the power converter 50. Then, at the heat exchanger discharge port 632 of the heat exchanger 63, the second temperature-adjusting medium TCM2 discharged to the medium discharge path 632b0 through the heat exchanger main body portion 630 and the second temperature-adjusting medium TCM2 flowing through the power converter temperature adjustment flow path 620b to cool the power converter 50 and introduced into the discharge-side first branch path 632b1 join at the discharge-side branch portion 632a, flow through the pressure feed flow path 620a from the discharge-side second branch path 632b2, and are temporarily stored in the storage tank 623. Then, the second temperature adjustment medium TCM2 stored in the reservoir tank 623 is supplied to the second pump 621 again through the pressure delivery passage 620a, and the second temperature adjustment medium TCM2 circulates in the second temperature adjustment circuit 62.
In this way, in the second temperature control circuit 62, the heat exchanger 63 is connected in parallel with the power conversion device 50. The second temperature control circuit 62 branches into a flow path that passes through the heat exchanger body 630 and a flow path that passes through the power conversion device 50 at the heat exchanger inlet port 631 of the heat exchanger 63, and the flow path that passes through the heat exchanger body 630 and the flow path that passes through the power conversion device 50 that branch at the heat exchanger inlet port 631 of the heat exchanger 63 join at the heat exchanger outlet port 632 of the heat exchanger 63. Therefore, in the second temperature control circuit 62, the heat exchanger 63 and the power converter 50 can be connected in parallel without providing a branching portion and a merging portion in the pipe forming the pressure feeding flow path 620a and the power converter temperature control flow path 620 b. Thus, the heat exchanger and the power conversion device can be connected in parallel in the temperature control circuit without complicating the piping structure.
In the present embodiment, the heat exchanger inlet port 631 is formed such that the flow rate of the second temperature adjustment medium TCM2 flowing through the power converter temperature adjustment flow passage 620b from the inlet side second branch 631b2 is greater than the flow rate of the second temperature adjustment medium TCM2 flowing through the heat exchanger main body portion 630 from the medium inlet passage 631b 0.
In the first temperature regulation circuit 61, the temperature of the first temperature regulation medium TCM1 stored in the storage portion 612 after cooling the motor 20, the generator 30, and the transmission 40 is about 100[ ° c ]. Therefore, the first temperature adjusting medium TCM1 of about 100[ ° c ] is supplied to the heat exchanger main body portion 630 of the heat exchanger 63.
On the other hand, in the second temperature regulation circuit 62, the temperature of the second temperature regulation medium TCM2 after being cooled by the radiator 622 is about 40[ ° c ]. The second temperature adjusting medium TCM2 supplied to the heat exchanger main body portion 630 of the heat exchanger 63 does not pass through the power conversion apparatus 50, and therefore, the second temperature adjusting medium TCM2 of about 40[ ° c ] is supplied to the heat exchanger main body portion 630.
In this way, the temperature of the first temperature adjustment medium TCM1 circulating in the first temperature adjustment circuit 61 and supplied to the heat exchanger 63 is higher than the temperature of the second temperature adjustment medium TCM2 circulating in the second temperature adjustment circuit 62 and supplied to the heat exchanger 63.
The heat exchanger 63 exchanges heat between the first temperature adjusting medium TCM1 of about 100[ ° c ] and the second temperature adjusting medium TCM2 of about 40[ ° c ] supplied to the heat exchanger main body portion 630. Then, the first temperature adjusting medium TCM1 of about 80[ ° c ] is discharged from the heat exchanger 63 to the downstream side of the first branch flow passage 610b1 of the first temperature adjusting circuit 61, and the second temperature adjusting medium TCM2 of about 70[ ° c ] is discharged from the medium discharge passage 632b0 of the heat exchanger discharge port 632.
In this way, the first temperature adjusting medium TCM1 is cooled by the heat exchanger 63, and therefore the temperature adjusting circuit 60 can cool the first temperature adjusting medium TCM1 without providing a radiator for cooling the first temperature adjusting medium TCM 1. Therefore, the temperature regulation circuit 60 can cool the first temperature regulation medium TCM1 flowing in the first temperature regulation circuit 61 and the second temperature regulation medium TCM2 flowing in the second temperature regulation circuit 62 with one radiator 622, and therefore the temperature regulation circuit 60 can be downsized.
The heat exchanger introduction port 631 is provided with an introduction-side flow rate adjustment device 631c capable of adjusting the flow rate of the second temperature adjustment medium TCM2 that flows from the pressure conveyance channel 620a into the medium introduction channel 631b0 and flows through the heat exchanger main body portion 630. In the present embodiment, the introduction-side flow rate adjustment device 631c is a wax-type thermostat. The heat exchanger discharge port 632 is provided with a discharge-side flow rate adjustment device 632c capable of adjusting the flow rate of the second temperature adjustment medium TCM2 that flows through the heat exchanger body portion 630 and is discharged from the medium discharge passage 632b0 to the pressure feed passage 620 a. In the present embodiment, the discharge-side flow rate adjustment device 632c is a wax type thermostat.
In the case where the first temperature adjusting medium TCM1 is ATF, when the temperature of the first temperature adjusting medium TCM1 is decreased, the viscosity of the first temperature adjusting medium TCM1 becomes high. Since the first temperature control medium TCM1 flows through the motor 20 and the generator 30, when the viscosity becomes high, the friction loss generated in the motor 20 and the generator 30 increases, and the output efficiency of the motor 20 and the generator 30 decreases. Therefore, when the temperature of the first temperature adjustment medium TCM1 is equal to or lower than a predetermined temperature without the motor 20 and the generator 30 becoming high, such as when the vehicle V starts, the first temperature adjustment medium TCM1 is preferably not cooled without being cooled.
Since the heat exchanger inlet port 631 is provided with an inlet-side flow rate adjustment device 631c capable of adjusting the flow rate of the second temperature adjustment medium TCM2 flowing from the pressure conveyance channel 620a into the medium inlet channel 631b0 and flowing through the heat exchanger main body portion 630, and the heat exchanger outlet port 632 is provided with an outlet-side flow rate adjustment device 632c capable of adjusting the flow rate of the second temperature adjustment medium TCM2 flowing through the heat exchanger main body portion 630 and discharged from the medium outlet channel 632b0 to the pressure conveyance channel 620a, the flow rate of the second temperature adjustment medium TCM2 flowing through the heat exchanger main body portion 630 of the heat exchanger 63 can be adjusted by the inlet-side flow rate adjustment device 631c and the outlet-side flow rate adjustment device 632 c. Therefore, the flow rate of the second temperature control medium TCM2 that exchanges heat with the first temperature control medium TCM1 at the heat exchanger main body portion 630 is adjusted by the introduction-side flow rate adjustment device 631c and the discharge-side flow rate adjustment device 632c, whereby the first temperature control medium TCM1 can be maintained at an appropriate temperature. For example, when the introduction-side flow rate adjustment device 631c blocks the medium introduction passage 631b0 and prevents the second temperature adjustment medium TCM2 flowing from the pressure feed passage 620a into the heat exchanger introduction port 631 from flowing into the medium introduction passage 631b0, the second temperature adjustment medium TCM2 is not supplied to the heat exchanger main body portion 630, and therefore the second temperature adjustment medium TCM2 staying in the heat exchanger main body portion 630 exchanges heat with the first temperature adjustment medium TCM1, and the first temperature adjustment medium TCM1 is not cooled.
Since the introduction-side flow rate adjustment device 631c and the discharge-side flow rate adjustment device 632c are both wax thermostats, the valve closes when the second temperature adjustment medium TCM2 retained in the heat exchanger main body portion 630 is below a predetermined temperature. When the inlet-side flow rate regulator 631c and the outlet-side flow rate regulator 632c are closed, the second temperature-control medium TCM2 is not supplied from the pressure-feed passage 620a to the heat exchanger main body 630 via the medium inlet passage 631b0, and the second temperature-control medium TCM2 retained in the heat exchanger main body 630 is not discharged from the medium outlet passage 632b0 to the pressure-feed passage 620 a. Therefore, when the second temperature control medium TCM2 staying in the heat exchanger main body portion 630 is lower than the predetermined temperature, heat is exchanged between the second temperature control medium TCM2 staying in the heat exchanger main body portion 630 and the first temperature control medium TCM1 flowing through the first branch flow passage 610b1 of the first temperature control circuit 61 in the heat exchanger main body portion 630, and the temperature of the second temperature control medium TCM2 staying in the heat exchanger main body portion 630 increases. When the temperature of the second temperature-adjusting medium TCM2 accumulated in the heat exchanger main body 630 rises to a predetermined temperature or higher, the introduction-side flow rate adjuster 631c and the discharge-side flow rate adjuster 632c are opened, the second temperature-adjusting medium TCM2 accumulated in the heat exchanger main body 630 is discharged from the medium discharge passage 632b0 to the pressure-feed passage 620a, and the second temperature-adjusting medium TCM2 is supplied from the pressure-feed passage 620a to the heat exchanger main body 630 via the medium introduction passage 631b 0. Then, heat is exchanged between the second temperature adjustment medium TCM2 supplied from the pressure conveyance passage 620a to the heat exchanger main body portion 630 via the medium introduction passage 631b0 and the first temperature adjustment medium TCM1 flowing through the first branch passage 610b1 of the first temperature adjustment circuit 61, and the first temperature adjustment medium TCM1 is cooled.
When the inlet-side flow rate regulator 631c and the outlet-side flow rate regulator 632c are closed, the temperature of the second temperature control medium TCM2 residing in the heat exchanger main body 630 is increased in accordance with the temperature of the first temperature control medium TCM1 flowing through the first branch flow passage 610b1 of the first temperature control circuit 61 because heat exchange is performed between the second temperature control medium TCM2 residing in the heat exchanger main body 630 and the first temperature control medium TCM1 flowing through the first branch flow passage 610b1 of the first temperature control circuit 61, in the heat exchanger main body 630. Therefore, since the introduction-side flow rate regulator 631c and the discharge-side flow rate regulator 632c are wax thermostats, the flow rate of the second temperature control medium TCM2 flowing through the heat exchanger main body portion 630 of the heat exchanger 63 can be regulated by the temperature of the first temperature control medium TCM1 flowing through the first branch flow path 610b1 of the first temperature control circuit 61 via the second temperature control medium TCM2 accumulated in the heat exchanger main body portion 630. Accordingly, the flow rate of the second temperature control medium TCM2 that exchanges heat with the first temperature control medium TCM1 in the heat exchanger main body 630 can be adjusted by the temperature of the first temperature control medium TCM1 flowing through the first branch flow passage 610b1 of the first temperature control circuit 61 with a simple configuration, and the first temperature control medium TCM1 can be maintained at an appropriate temperature with a simple configuration.
As shown in fig. 2 and 3, the vehicle drive device 10 further includes a rotary electric machine case 70 that houses the electric machine 20, the generator 30, and the transmission 40. The power conversion device 50 is disposed above the rotary electric machine case 70 and at least partially overlaps the rotary electric machine case 70 in a plan view.
The radiator 622 is disposed forward of the rotary motor case 70 in the front-rear direction of the vehicle V. The heat exchanger 63 is disposed between the rotary motor housing 70 and the radiator 622 in the front-rear direction of the vehicle V. In the present embodiment, the heat exchanger 63 is fixed to a front surface 70a of the rotary motor housing 70 facing the vehicle front. The second pump 621 and the reservoir tank 623 are disposed between the rotary motor housing 70 and the radiator 622, more specifically, between the heat exchanger 63 and the radiator 622 in the front-rear direction of the vehicle V. In the present embodiment, the storage tank 623 is disposed above the heat exchanger 63 and at a position at which at least a part of the storage tank overlaps the rotary motor housing 70 and the power conversion device 50, as viewed from the front of the vehicle V. The second pump 621 is disposed on the left of the heat exchanger 63 and on the left lower side of the storage tank 623.
The heat exchanger main body portion 630 has a substantially rectangular parallelepiped shape, and a front surface 630a of the heat exchanger main body portion 630 facing the vehicle front side has a substantially square shape when viewed from the front of the vehicle V.
The heat exchanger inlet port 631 and the heat exchanger outlet port 632 of the heat exchanger 63 are provided so as to protrude toward the vehicle front side from the front surface 630a of the heat exchanger main body portion 630.
The heat exchanger inlet port 631 is provided in a lower left region of the front surface 630a of the heat exchanger main body portion 630 as viewed from the front of the vehicle V. The heat exchanger discharge port 632 is provided in an upper right region of the front surface 630a of the heat exchanger main body portion 630 as viewed from the front of the vehicle V.
The medium introduction path 631bo of the heat exchanger introduction port 631 extends toward the vehicle front from the front surface 630a of the heat exchanger main body portion 630. The inlet side first branch 631b1 of the heat exchanger inlet port 631 extends from the inlet side branch 631a toward the lower right of the vehicle V. The inlet side second branch 631b2 of the heat exchanger inlet port 631 extends from the inlet side branch portion 631a toward the upper left of the vehicle V.
The medium discharge passage 632b0 of the heat exchanger discharge port 632 extends from the front surface 630a of the heat exchanger main body portion 630 toward the vehicle front. The discharge side first branch 632b1 of the heat exchanger discharge port 632 extends from the discharge side branch portion 632a toward the upper left of the vehicle V. The discharge side second branch 632b2 of the heat exchanger discharge port 632 extends rightward and downward of the vehicle V from the discharge side branch portion 632 a.
The power converter 50 includes a power converter main body 51 that houses the PDU, VCU, and the like, not shown, described above, a power converter inlet port 521 that introduces the second temperature control medium TCM2 into the power converter main body 51, and a power converter outlet port 522 that discharges the second temperature control medium TCM2 flowing through the power converter main body 51 from the power converter main body 51. The power converter main body 51 has a substantially rectangular parallelepiped shape. The power converter inlet port 521 and the power converter outlet port 522 are provided on the vehicle front side of the power converter main body portion 51. In the present embodiment, the power converter inlet port 521 and the power converter outlet port 522 are provided to protrude toward the vehicle front side from the front surface 51a of the power converter main body 51 facing the vehicle front side. The power converter inlet port 521 and the power converter outlet port 522 are arranged on the front surface 51a of the power converter main body 51 in the left-right direction such that the power converter inlet port 521 is on the left side and the power converter outlet port 522 is on the right side.
The reservoir tank 623 includes a reservoir portion 623a that stores the second temperature adjustment medium TCM2, a reservoir tank introduction port 623b that introduces the second temperature adjustment medium TCM2 into the reservoir portion 623a, and a reservoir tank discharge port 623c that discharges the second temperature adjustment medium TCM2 stored in the reservoir portion 623a from the reservoir portion 623 a. The tank inlet port 623b and the tank outlet port 623c protrude downward from a lower surface of the storage portion 623a facing downward. The tank inlet port 623b and the tank outlet port 623c are arranged on the lower surface of the storage portion 623a in the left-right direction such that the tank inlet port 623b is on the right side and the tank outlet port 623c is on the left side.
The inlet side second branch 631b2 of the heat exchanger inlet port 631 of the heat exchanger 63 and the power conversion device inlet port 521 of the power conversion device 50 are connected by a supply pipe 620b 1. The power converter discharge port 522 of the power converter 50 and the discharge-side first branch 632b1 of the heat exchanger discharge port 632 of the heat exchanger 63 are connected by a discharge pipe 620b 2. The discharge side second branch 632b2 of the heat exchanger discharge port 632 of the heat exchanger 63 and the storage tank inlet port 623b of the storage tank 623 are connected by a first pipe 620a 1. The tank discharge port 623c of the tank 623 and the suction port 621a of the second pump 621 are connected by a second pipe 620a 2. The discharge port 621b of the second pump 621 and the introduction port 622a of the radiator 622 are connected by a third pipe 620a 3. The outlet port 622b of the radiator 622 and the inlet side first branch 631b1 of the heat exchanger inlet port 631 of the heat exchanger 63 are connected by a fourth pipe 620a 4.
The power converter temperature adjustment flow path 620b of the second temperature adjustment circuit 62 is formed by the supply pipe 620b1 and the discharge pipe 620b 2. Therefore, the upstream end of the supply pipe 620b1 constitutes the upstream end of the power converter temperature adjustment flow path 620b and is connected to the inlet side second branch 631b2 of the heat exchanger inlet 631 of the heat exchanger 63. Further, a downstream side end portion of the discharge pipe 62062 constitutes a downstream side end portion of the power converter temperature adjustment flow path 620b, and is connected to the discharge side first branch 632b1 of the heat exchanger discharge port 632 of the heat exchanger 63.
The pressurized transport flow path 620a of the second temperature control circuit 62 is formed by a first pipe 620a1, a second pipe 620a2, a third pipe 620a3, and a fourth pipe 620a 4. Therefore, the upstream end portion of the first tube 620a1 constitutes the upstream end portion of the pressurized conveyance flow path 620a, and is connected to the discharge-side second branch 632b2 of the heat exchanger discharge port 632 of the heat exchanger 63. Further, a downstream end of the fourth pipe 620a4 constitutes a downstream end of the pressurized conveyance flow path 620a and is connected to the inlet-side first branch 631b1 of the heat exchanger inlet port 631 of the heat exchanger 63.
At this time, since the radiator 622 is disposed forward of the rotary motor case 70 in the front-rear direction of the vehicle V and the heat exchanger 63 is disposed between the rotary motor case 70 and the radiator 622 in the front-rear direction of the vehicle V, the fourth pipe 620a4 that connects the discharge port 622b of the radiator 622 and the introduction-side first branch 631b1 of the heat exchanger introduction port 631 of the heat exchanger 63 can be collected between the rotary motor case 70 and the radiator 622 in the front-rear direction of the vehicle V, and the length of the fourth pipe 620a4 can be shortened. This can shorten the length of the pressure feed flow passage 620a, and thus can reduce the size of the vehicle driving device 10.
Further, since the second pump 621 and the reservoir tank 623 are disposed between the rotary motor case 70 and the radiator 622, and more specifically, between the heat exchanger 63 and the radiator 622 in the front-rear direction of the vehicle V, the first pipe 620a1 connecting the discharge-side second branch 632b2 of the heat exchanger discharge port 632 of the heat exchanger 63 and the reservoir tank introduction port 623b of the reservoir tank 623, the second pipe 620a2 connecting the reservoir tank discharge port 623c of the reservoir tank 623 and the suction port 621a of the second pump 621, and the third pipe 620a3 connecting the discharge port 621b of the second pump 621 and the introduction port 622a of the radiator 622 can be collected between the rotary motor case 70 and the radiator 622, and the lengths of the first pipe 620a1, the second pipe 620a2, and the third pipe 620a3 can be shortened. This can shorten the length of the pressure feed flow passage 620a, and thus can further reduce the size of the vehicle driving device 10.
Further, since the power converter 50 is disposed above the rotary motor case 70 and at least a part of the power converter inlet port 521 and the power converter discharge port 522 is disposed on the vehicle front side of the power converter main body portion 51 in plan view, the inlet side second branch 631b2 connecting the heat exchanger inlet port 631 of the heat exchanger 63 and the supply pipe 620b1 of the power converter inlet port 521 of the power converter 50, and the outlet pipe 620b2 connecting the power converter discharge port 522 of the power converter 50 and the outlet side first branch 632b1 of the heat exchanger discharge port 632 of the heat exchanger 63 can be collected between the power converter 50 and the radiator 622 in the front-rear direction of the vehicle V, and the lengths of the supply pipe 620b1 and the outlet pipe 620b2 can be shortened. This can shorten the length of the power converter temperature adjustment flow path 620b, and thus the vehicle driving device 10 can be further downsized.
As described above, in the present embodiment, the first pipe 620a1, the second pipe 620a2, the third pipe 620a3, the fourth pipe 620a4, the supply pipe 620b1, and the discharge pipe 620b2 can be integrated between the rotary electric motor case 70 and the power conversion device 50 and the radiator 622 in the front-rear direction of the vehicle V, so that the length of the second temperature control circuit 62 can be shortened, and the vehicle drive device 10 can be further downsized.
Although the embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited to these embodiments. Those skilled in the art will recognize that various modifications and adaptations can be made within the scope of the invention as set forth in the claims, and it is understood that these modifications and adaptations also fall within the technical scope of the invention. In addition, the respective components in the above embodiments may be arbitrarily combined without departing from the scope of the invention.
For example, in the present embodiment, the heat exchanger inlet port 631 is provided with an inlet-side flow rate adjustment device 631c capable of adjusting the flow rate of the second temperature adjustment medium TCM2 flowing through the heat exchanger main body portion 630, and the heat exchanger outlet port 632 is provided with an outlet-side flow rate adjustment device 632c capable of adjusting the flow rate of the second temperature adjustment medium TCM2 flowing through the heat exchanger main body portion 630, but at least one of the heat exchanger inlet port 631 and the heat exchanger outlet port 632 may be provided with a flow rate adjustment device capable of adjusting the flow rate of the second temperature adjustment medium TCM2 flowing through the heat exchanger main body portion 630, and for example, either of the inlet-side flow rate adjustment device 631c and the outlet-side flow rate adjustment device 632c may be omitted.
The present specification describes at least the following matters. Although the corresponding components and the like in the above-described embodiments are shown in parentheses as an example, the present invention is not limited to these.
(1) A vehicle drive device (vehicle drive device 10) is provided with: a rotating electrical machine (motor 20); a power conversion device (power conversion device 50) that controls the rotating electric machine; and a temperature control circuit (temperature control circuit 60) that controls the temperature of the rotating electrical machine and the power conversion device, the temperature control circuit including: a first temperature adjustment circuit (first temperature adjustment circuit 61) through which a first temperature adjustment medium (first temperature adjustment medium TCM1) circulates for temperature adjustment of the rotary electric machine; a second temperature control circuit (second temperature control circuit 62) that circulates a second temperature control medium (second temperature control medium TCM2) different from the first temperature control medium, and that performs temperature control of the power conversion device; and a heat exchanger (heat exchanger 63) that exchanges heat between the first temperature adjustment medium and the second temperature adjustment medium, the second temperature adjustment circuit having: a pressure feed passage (pressure feed passage 620a) provided with a radiator (radiator 622) and a pump (second pump 621); and a power converter temperature adjustment flow path (power converter temperature adjustment flow path 620b) in which the power converter is provided, the heat exchanger including: a heat exchanger main body portion (heat exchanger main body portion 630) that exchanges heat between the first temperature adjustment medium and the second temperature adjustment medium; a heat exchanger introduction port (heat exchanger introduction port 631) that introduces the second temperature adjustment medium into the heat exchanger main body portion; and a heat exchanger discharge port (heat exchanger discharge port 632) that discharges the second temperature-adjusting medium flowing through the heat exchanger main body from the heat exchanger main body, the heat exchanger introduction port including a introduction-side branch portion (introduction-side branch portion 631a), a medium introduction path (medium introduction path 631b0) that connects the heat exchanger main body and the introduction-side branch portion, a introduction-side first branch path (introduction-side first branch path 631b1) that extends from the introduction-side branch portion, and a introduction-side second branch path (introduction-side second branch path 631b2) that extends from the introduction-side branch portion, the heat exchanger introduction port branching off in three directions, the heat exchanger discharge port including a discharge-side branch portion (discharge-side branch portion 632a), a medium discharge path (medium discharge path 632b0) that connects the heat exchanger main body and the discharge-side branch portion, A discharge-side first branch (a discharge-side first branch 632b1) extending from the discharge-side branch portion, and a discharge-side second branch (a discharge-side second branch 632b2) extending from the discharge-side branch portion, the heat exchanger discharge port branching in three directions, the downstream end portion of the pressure-feed flow path being connected to the introduction-side first branch, the upstream end portion of the power converter temperature-adjustment flow path being connected to the introduction-side second branch, the downstream end portion of the power converter temperature-adjustment flow path being connected to the discharge-side first branch, and the upstream end portion of the pressure-feed flow path being connected to the discharge-side second branch.
According to (1), the second temperature control circuit branches into a flow path that passes through the heat exchanger body portion at the heat exchanger introduction port of the heat exchanger and a flow path that passes through the power conversion device, and the flow path that passes through the heat exchanger body portion and the flow path that passes through the power conversion device that branch at the heat exchanger introduction port of the heat exchanger join at the heat exchanger discharge port of the heat exchanger. Therefore, in the second temperature control circuit, the heat exchanger and the power conversion device can be connected in parallel without providing a branching portion and a merging portion in the pressure feed flow path and the power conversion device temperature control flow path. Thus, the heat exchanger and the power conversion device can be connected in parallel in the temperature control circuit without complicating the piping structure.
(2) The vehicle driving apparatus according to (1), further comprising a rotary electric machine housing (rotary electric machine housing 70) that houses the rotary electric machine, wherein the radiator is disposed forward of the rotary electric machine housing in a front-rear direction of a vehicle (vehicle V), and wherein the heat exchanger is disposed between the rotary electric machine housing and the radiator in the front-rear direction.
According to (2), since the radiator is disposed forward of the rotary electric machine housing in the front-rear direction of the vehicle and the heat exchanger is disposed between the rotary electric machine housing and the radiator in the front-rear direction of the vehicle, the length of the pressure feed circuit can be shortened, and the vehicle drive device can be downsized.
(3) The vehicle driving apparatus according to (2), wherein the power conversion device is disposed above the rotary electric machine housing and at a position where at least a part of the power conversion device overlaps the rotary electric machine housing when viewed in plan, and includes: a power converter main body portion (power converter main body portion 51); a power converter inlet port (power converter inlet port 521) for introducing the second temperature control medium into the power converter main body; and a power converter discharge port (power converter discharge port 522) that discharges the second temperature-adjusting medium flowing through the power converter main body from the power converter main body, the power converter inlet port and the power converter discharge port being provided on a vehicle front side of the power converter main body.
According to (3), the power converter is disposed above the rotary electric machine case at a position at which at least a part of the power converter overlaps the rotary electric machine case in a plan view, and the power converter inlet port and the power converter outlet port are provided on the vehicle front side of the power converter main body, so that the length of the power converter temperature adjustment flow path can be shortened, and the vehicle drive device can be further downsized.
(4) The vehicle driving apparatus according to (1), wherein a flow rate adjusting device (an inlet-side flow rate adjusting device 631c, a discharge-side flow rate adjusting device 632c) capable of adjusting a flow rate of the second temperature adjusting medium flowing through the heat exchanger main body portion is provided at least one of the heat exchanger inlet port and the heat exchanger outlet port.
According to (4), since the flow rate adjusting device capable of adjusting the flow rate of the second temperature adjusting medium flowing through the heat exchanger main body portion is provided at least one of the heat exchanger inlet port and the heat exchanger outlet port, the flow rate of the second temperature adjusting medium flowing through the heat exchanger main body portion of the heat exchanger can be adjusted by the flow rate adjusting device. Thus, the flow rate of the second temperature-adjusting medium that exchanges heat with the first temperature-adjusting medium in the heat exchanger main body portion can be adjusted by the flow rate adjusting device, and therefore the first temperature-adjusting medium can be maintained at an appropriate temperature.
(5) The vehicle drive apparatus according to (4), characterized in that the flow rate adjustment device is a thermostat.
According to (5), since the flow rate adjusting device is a thermostat, the flow rate of the second temperature-adjusting medium flowing through the heat exchanger main body portion of the heat exchanger can be adjusted according to the temperature of the first temperature-adjusting medium flowing through the first temperature-adjusting circuit by means of the second temperature-adjusting medium accumulated in the heat exchanger main body portion. With this, the flow rate of the second temperature-adjusting medium that exchanges heat with the first temperature-adjusting medium in the first temperature-adjusting heat exchanger main body portion can be adjusted in accordance with the temperature of the first temperature-adjusting medium flowing through the first temperature-adjusting circuit with a simple configuration, and therefore the first temperature-adjusting medium TCM1 can be maintained at an appropriate temperature with a simple configuration.
Claims (5)
1. A vehicle driving device is provided with:
a rotating electric machine;
a power conversion device that controls the rotating electric machine; and
a temperature control circuit that controls the temperature of the rotating electrical machine and the temperature of the power conversion device,
the temperature regulation circuit has:
a first temperature control circuit in which a first temperature control medium circulates, the first temperature control circuit being configured to control the temperature of the rotating electrical machine;
a second temperature control circuit in which a second temperature control medium different from the first temperature control medium circulates, the second temperature control circuit being configured to control the temperature of the power conversion device; and
a heat exchanger that exchanges heat between the first temperature adjustment medium and the second temperature adjustment medium,
the second temperature regulation circuit has:
a pressurized delivery flow path provided with a radiator and a pump; and
a power conversion device temperature adjustment flow path provided with the power conversion device,
the heat exchanger has:
a heat exchanger main body portion that exchanges heat between the first temperature adjustment medium and the second temperature adjustment medium;
a heat exchanger introduction port that introduces the second temperature adjustment medium into the heat exchanger main body portion; and
a heat exchanger discharge port that discharges the second temperature adjustment medium flowing through the heat exchanger main body portion from the heat exchanger main body portion,
the heat exchanger inlet port includes an inlet-side branch portion, a medium inlet passage connecting the heat exchanger body portion and the inlet-side branch portion, an inlet-side first branch extending from the inlet-side branch portion, and an inlet-side second branch extending from the inlet-side branch portion, and is branched in three directions,
the heat exchanger discharge port includes a discharge-side branch portion, a medium discharge path connecting the heat exchanger main body portion and the discharge-side branch portion, a discharge-side first branch extending from the discharge-side branch portion, and a discharge-side second branch extending from the discharge-side branch portion, and is branched in three directions,
a downstream end of the pressurized transport passage is connected to the introduction-side first branch passage,
an upstream end of the power converter temperature control flow path is connected to the introduction-side second branch path,
a downstream end of the power converter temperature adjustment flow path is connected to the discharge-side first branch path,
the discharge-side second branch passage is connected to an upstream end of the pressurized-delivery passage.
2. The vehicle drive apparatus according to claim 1,
the vehicle drive device further includes a rotating electric machine housing the rotating electric machine,
the radiator is disposed forward of the rotary motor housing in a front-rear direction of the vehicle,
the heat exchanger is disposed between the rotary electric machine casing and the radiator in the front-rear direction.
3. The vehicle drive apparatus according to claim 2,
the power conversion device is disposed above the rotary electric machine casing and at a position at which at least a part of the power conversion device overlaps the rotary electric machine casing in a plan view, and includes:
a power conversion device main body section;
a power conversion device introduction port that introduces the second temperature control medium into the power conversion device main body; and
a power converter discharge port that discharges the second temperature-adjusting medium flowing through the power converter main body from the power converter main body,
the power converter inlet port and the power converter outlet port are provided on the vehicle front side of the power converter main body.
4. The vehicle drive apparatus according to claim 1,
a flow rate adjusting device capable of adjusting a flow rate of the second temperature adjusting medium flowing through the heat exchanger main body is provided at least one of the heat exchanger inlet port and the heat exchanger outlet port.
5. The vehicle drive apparatus according to claim 4,
the flow regulating device is a thermostat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120399606.2U CN214564592U (en) | 2021-02-23 | 2021-02-23 | Vehicle drive device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120399606.2U CN214564592U (en) | 2021-02-23 | 2021-02-23 | Vehicle drive device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214564592U true CN214564592U (en) | 2021-11-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120399606.2U Active CN214564592U (en) | 2021-02-23 | 2021-02-23 | Vehicle drive device |
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| Country | Link |
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| CN (1) | CN214564592U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2623414A (en) * | 2022-10-05 | 2024-04-17 | Porsche Ag | Cooling system for an electric traction machine for a motor vehicle |
-
2021
- 2021-02-23 CN CN202120399606.2U patent/CN214564592U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2623414A (en) * | 2022-10-05 | 2024-04-17 | Porsche Ag | Cooling system for an electric traction machine for a motor vehicle |
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