Heat balance electric drive axle system

Abstract

The utility model provides a heat balance electric drive axle system, and relates to the technical field of vehicle power. The heat balance electric drive axle system comprises a motor, a gearbox and an oil-oil heat exchanger, the motor side of the oil-oil heat exchanger is communicated with a cooling oil way of the motor, and the gearbox side of the oil-oil heat exchanger is communicated with a lubricating oil way of the gearbox. According to the heat balance electric drive axle system, by arranging the oil-oil heat exchanger, temperature complementation of the motor and the gearbox can be achieved, for example, when the temperature of the motor is high and the temperature of the gearbox is low, heat generated by the motor can be transmitted to lubricating oil of the gearbox through a cooling oil way of the motor and the oil-oil heat exchanger, and therefore the heat balance effect is achieved. The heat dissipation requirement of the motor can be met, the heat dissipation load of a whole vehicle heat management system is reduced, and the heat dissipation allowance of the gearbox is utilized. Moreover, according to the heat balance electric drive axle system, lubricating oil of the gearbox can be heated in the oil-oil heat exchanger to be heated, and therefore the problem that lubrication is affected due to the fact that the viscosity of the lubricating oil of the gearbox is too high in the low-temperature environment can be solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to vehicle power technology field, specifically, relate to a kind of thermal equilibrium electric drive axle system. BACKGROUND

[0002] Electric drive axle system includes motor, gearbox and axle, wherein, motor and gearbox jointly constitute electric drive system, when vehicle runs, motor drives gearbox transmission speed and torque to axle wheel end.

[0003] Since electric drive axle system uses motor as power source, the driving power of motor is large, so the heat dissipation demand of motor is also large, therefore, for the vehicle using electric drive axle system, the heat dissipation load of vehicle thermal management system is relatively large. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a kind of thermal equilibrium electric drive axle system to solve the technical problem that the heat dissipation load of vehicle thermal management system of vehicle using electric drive axle system is relatively large due to the heat dissipation demand of motor of electric drive axle system is large.

[0005] The thermal equilibrium electric drive axle system provided by the utility model includes motor, gearbox and oil-oil heat exchanger, the motor side of the oil-oil heat exchanger is communicated with the cooling oil circuit of the motor, the gearbox side of the oil-oil heat exchanger is communicated with the lubricating oil circuit of the gearbox.

[0006] Further, the thermal equilibrium electric drive axle system further includes water circulation system and oil-water heat exchanger, the water side of the oil-water heat exchanger is communicated with the water circulation system, the oil side of the oil-water heat exchanger is communicated with the cooling oil circuit of the motor, and the oil-water heat exchanger is used to transfer the cold or heat of water of the water circulation system to the cooling oil of the motor.

[0007] Further, the oil side of the oil-water heat exchanger and the motor side of the oil-oil heat exchanger are connected in series, and the cooling oil of the motor flows through the oil-water heat exchanger and then flows through the oil-oil heat exchanger.

[0008] Further, the motor is provided with outer water jacket, and the water of the water circulation system flows through the outer water jacket to cool or heat the shell of the motor.

[0009] Further, the water side of the oil-water heat exchanger and the outer water jacket are connected in series, and the water of the water circulation system flows through the oil-water heat exchanger and then flows through the outer water jacket.

[0010] Further, the water circulation system belongs to vehicle thermal management system.

[0011] Further, the motor can be locked to rotate to heat the cooling oil in it.

[0012] Further, the oil outlet end of the gearbox is provided with a first oil pump, and / or the oil outlet end of the motor is provided with a second oil pump.

[0013] Further, the first oil pump is a first electronic oil pump, and / or the second oil pump is a second electronic oil pump.

[0014] Further, the motor is provided with at least one of a winding end spraying structure, a bearing spraying structure and a stator spraying structure, all of which are connected with the oil outlet end of the motor side of the oil-oil heat exchanger.

[0015] And / or, the gearbox is provided with at least one of a gear meshing point oil nozzle and a bearing oil nozzle, both of which are connected with the oil outlet end of the gearbox side of the oil-oil heat exchanger.

[0016] Further, the housings of the motor and the gearbox are integrated into an electric drive system housing.

[0017] The oil-oil heat exchanger is arranged in the electric drive system housing, or the oil-oil heat exchanger is arranged in or close to the oil pan of the gearbox.

[0018] The oil-water heat exchanger is arranged in the electric drive system housing, or the oil-water heat exchanger is arranged close to the oil pan of the motor, or the oil-water heat exchanger is arranged close to the oil-oil heat exchanger.

[0019] The heat balance electric drive bridge system provided by the utility model has the following beneficial effects:

[0020] The heat balance electric drive bridge system provided by the utility model can realize temperature complementation of the motor and the gearbox by arranging the oil-oil heat exchanger, for example, when the temperature of the motor is relatively high and the temperature of the gearbox is relatively low, the heat generated by the motor can be transmitted to the lubricating oil of the gearbox through the cooling oil circuit and the oil-oil heat exchanger, so that the heat dissipation demand of the motor can be met, the heat dissipation load of the whole vehicle heat management system is reduced, and the heat dissipation margin of the gearbox is utilized. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only the embodiments of the present application, and other drawings can also be obtained by the provided drawings without creative labor for those skilled in the art.

[0022] Figure 1 The principle diagram of the heat balance electric drive axle system provided by the embodiments of the present application is shown.

[0023] Mark explanation:

[0024] 100-electric drive system; 110-motor; 111-outer water jacket; 120-gearbox; 200-oil-oil heat exchanger; 300-oil-water heat exchanger; 400-first oil pump; 500-second oil pump; 600-vehicle thermal management system. Specific implementation

[0025] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the drawings. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0026] In the electric drive axle system, on the one hand, the heat dissipation demand of the motor 110 is also large because the driving power of the motor 110 is large, which increases the heat dissipation load of the vehicle thermal management system 600 of the vehicle using the electric drive axle system; on the other hand, the gearbox 120 does not need to be provided with multiple gears because the speed regulating range of the motor 110 is wide, so the structure of the gearbox 120 is relatively simple, the number of parts is greatly reduced, and at the same time, the transmission efficiency of the gearbox 120 is improved due to the improvement of the machining precision of the parts, so the energy consumption and heat generation of the gearbox 120 in the electric drive axle system are small, and the heat dissipation capacity margin of the gearbox 120 is large under the condition of natural air cooling. In a low temperature environment, the gearbox 120 may even have a phenomenon that the lubricating oil viscosity is too high to affect lubrication due to too low temperature.

[0027] In order to solve the above problems, the present embodiment considers the characteristics of large heat dissipation demand of the motor 110 and large heat dissipation capacity margin of the gearbox 120, and in combination with the vehicle thermal management system 600, provides a heat balance electric drive axle system. As shown in Figure 1 The heat balance electric drive axle system provided by the present embodiment includes a motor 110, a gearbox 120 and an oil-oil heat exchanger 200, the motor side of the oil-oil heat exchanger 200 is communicated with the cooling oil circuit of the motor 110, and the gearbox side of the oil-oil heat exchanger 200 is communicated with the lubricating oil circuit of the gearbox 120.

[0028] The heat balance electric drive axle system provided in the embodiment can make the temperature of the motor 110 and the gearbox 120 complementary, for example, when the temperature of the motor 110 is relatively high and the temperature of the gearbox 120 is relatively low, the heat generated by the motor 110 can be transmitted to the lubricating oil of the gearbox 120 through the cooling oil circuit and the oil-oil heat exchanger 200, so that the heat dissipation demand of the motor 110 can be met, the heat dissipation load of the vehicle thermal management system 600 is reduced, and the heat dissipation margin of the gearbox 120 is utilized. Moreover, when the gearbox 120 operates in a low-temperature environment, the low temperature can cause the viscosity of the lubricating oil to be too high to affect lubrication, but the lubricating oil of the gearbox 120 can be heated and warmed up in the oil-oil heat exchanger 200, so that the problem of the lubricating oil of the gearbox 120 being too viscous to affect lubrication in a low-temperature environment can be solved.

[0029] As shown in FIG. 1, Figure 1 In the embodiment, the heat balance electric drive axle system further comprises a water circulation system and an oil-water heat exchanger 300. The water side of the oil-water heat exchanger 300 is in communication with the water circulation system, and the oil side of the oil-water heat exchanger 300 is in communication with the cooling oil circuit of the motor 110. The oil-water heat exchanger 300 is used to transmit the cold or heat of the water of the water circulation system to the cooling oil of the motor 110. Specifically, when the motor 110 needs to be cooled, the water circulation system can introduce water with a relatively low temperature. At the oil-water heat exchanger 300, the cold of the water is transmitted to the cooling oil on the oil side, or the cooling oil of the motor 110 transmits heat to the water on the water side at the oil-water heat exchanger 300, so that the cooling oil is cooled. When the cooling oil of the motor 110 flowing to the oil-water heat exchanger 300 needs to be heated, the water circulation system can introduce water with a relatively high temperature to heat the cooling oil on the oil side. It should be noted that the "water" here refers to a cooling liquid including water.

[0030] In the embodiment, the water circulation system belongs to the vehicle thermal management system 600.

[0031] As shown in FIG. 1, Figure 1 In the embodiment, the oil side of the oil-water heat exchanger 300 and the motor side of the oil-oil heat exchanger 200 are connected in series, and the cooling oil of the motor 110 flows through the oil-water heat exchanger 300 and then flows through the oil-oil heat exchanger 200. In this arrangement, when the lubricating oil of the gearbox 120 needs to be heated due to too high viscosity caused by low temperature, the heat of the cooling oil of the motor 110 can be transmitted to the lubricating oil on the gearbox side at the oil-oil heat exchanger 200 after flowing through the oil-water heat exchanger 300. Moreover, water with a relatively high temperature can be introduced into the water circulation system, so that the cooling oil of the motor 110 can absorb the heat on the water side when flowing through the oil-water heat exchanger 300, thereby further increasing the temperature of the cooling oil and improving the heating rate of the lubricating oil of the gearbox 120.

[0032] In this embodiment, the motor 110 can be locked to heat the cooling oil inside. In locked state, the heat output power can reach 4kW. Thus, when starting at low temperature, the temperature of the cooling oil inside the motor 110 can be raised by controlling the motor 110 to be locked, and then the heat of the cooling oil is transferred to the lubricating oil of the gearbox 120 through the oil-oil heat exchanger 200, so as to raise the temperature of the lubricating oil, reduce the viscosity of the lubricating oil, ensure the lubricating effect of the lubricating oil on the gearbox 120, and shorten the working preparation time of the power system.

[0033] Preferably, the vehicle provided with the heat balance electric drive axle system in this embodiment can use the double heat source heating mode of the motor 110 locking heating and the vehicle thermal management system 600 heating to heat the lubricating oil of the gearbox 120 when starting at low temperature. The heat generated by the motor 110 locking can be conducted to the lubricating oil of the gearbox 120 through the oil-oil heat exchanger 200 and the shell. The vehicle thermal management system 600 can transfer heat to the cooling oil of the motor 110 at the oil-water heat exchanger 300 through the water circulation system, and then the cooling oil of the motor 110 transfers heat to the lubricating oil of the gearbox 120 at the oil-oil heat exchanger 200, so as to finally realize the heating of the lubricating oil of the gearbox 120. When driving at low temperature for a long time, the motor 110 and the gearbox 120 can be preferentially complemented in temperature, and the external vehicle thermal management system 600 can be adjusted in real time, so as to maximize the heat dissipation capacity of the gearbox 120 and reduce the heat dissipation load of the vehicle thermal management system 600.

[0034] As shown in FIG. 1, the motor 110 is arranged on the gearbox 120, and the motor 110 is arranged on the gearbox 120. Figure 1 As shown in FIG. 1, the motor 110 is arranged on the gearbox 120, and the motor 110 is arranged on the gearbox 120.

[0035] Further, in the embodiment, the water side of the oil-water heat exchanger 300 and the outer water jacket 111 are connected in series, and the water in the water circulation system first flows through the oil-water heat exchanger 300 and then flows through the outer water jacket 111. In this arrangement, when the lubricating oil of the gearbox 120 needs to be heated, the water in the water circulation system first flows through the water side of the oil-water heat exchanger 300, so that heat can be preferentially transferred to the cooling oil on the oil side of the oil-water heat exchanger 300, so as to quickly heat the lubricating oil of the gearbox 120; and then flows through the outer water jacket 111 of the motor 110, so that heat is transferred to the cooling oil in the motor 110 or the housing of the gearbox 120 through the shell, and then the heat is transferred to the lubricating oil of the gearbox 120 through the cooling oil of the motor 110 or the housing of the gearbox 120. When the motor 110 needs to be cooled, the water circulation system can be used to preferentially accelerate the cooling of the cooling oil of the motor 110 while using the heat dissipation capacity of the gearbox 120, so that the cooling oil with a higher temperature can be quickly cooled, so that the cooling oil with a lower temperature flowing back to the motor 110 can cool the motor 110 inside the motor 110; after the cooling oil of the motor 110 is preferentially cooled at the oil-water heat exchanger 300, the water in the water circulation system also flows through the shell of the motor 110, so that the motor 110 can be cooled from the outside of the motor 110.

[0036] As shown in FIG. 4, in the embodiment, the oil outlet end of the gearbox 120 is provided with a first oil pump 400, and the oil inlet of the first oil pump 400 is connected to the oil pan of the gearbox 120 through an oil circuit, so as to provide power for the circulation of the lubricating oil of the gearbox 120. The circulation path of the lubricating oil of the gearbox 120 is: the gearbox 120-the first oil pump 400-the gearbox side of the oil-oil heat exchanger 200-the gearbox 120. Figure 1

[0037] In the embodiment, the oil outlet end of the motor 110 is provided with a second oil pump 500, and the second oil pump 500 is connected to the oil pan of the motor 110 through an oil circuit, so as to provide power for the circulation of the cooling oil of the motor 110. The circulation path of the cooling oil of the motor 110 is: the motor 110-the second oil pump 500-the oil side of the oil-water heat exchanger 300-the motor side of the oil-oil heat exchanger 200-the motor 110.

[0038] Preferably, in the embodiment, the first oil pump 400 is a first electronic oil pump, and the second oil pump 500 is a second electronic oil pump, so that software control can be achieved.

[0039] In order to better cool the motor 110, in the embodiment, at least one of a winding end spraying structure, a bearing spraying structure, and a stator spraying structure can be arranged in the motor 110, and preferably all of the three structures are arranged in the motor 110, and all of the three structures are connected to the oil outlet end of the motor side of the oil-oil heat exchanger 200.

[0040] ​In order to better lubricate the gearbox 120, at least one of the gear mesh point oil nozzle and the bearing oil nozzle can be arranged in the gearbox 120 in the embodiment, and preferably, both of them are arranged in the gearbox 120, and both of them are connected with the oil outlet end of the gearbox side of the oil-oil heat exchanger 200.

[0041] In the embodiment, the motor 110 and the gearbox 120 jointly constitute the electric drive system 100, the housings of the two are integrated into an electric drive system housing, which can be an integrated housing or a split housing integrated by bolt connection, and the electric drive system housing is connected to the axle through a flange surface to form an electric axle system.

[0042] The oil-oil heat exchanger 200 can be arranged in the electric drive system housing, so that the arrangement of the oil-oil heat exchanger 200 is flexible and convenient for installation and maintenance; the oil-oil heat exchanger 200 can also be arranged in the oil pan of the gearbox 120 or near the oil pan of the gearbox 120, which is more conducive to shortening the oil circuit of the gearbox 120 and reducing the flow resistance of the low-temperature oil and increasing the heat exchange effect.

[0043] Preferably, the oil-oil heat exchanger 200, especially the port connected with the cooling oil circuit of the motor 110, is close to the oil inlet of the first oil pump 400, so as to quickly improve the flowability of the lubricating oil near the oil inlet of the first electronic oil pump, thereby improving the heating efficiency of the lubricating oil in the gearbox 120.

[0044] The oil-water heat exchanger 300 can be arranged in the electric drive system housing, so that the arrangement of the oil-water heat exchanger 300 is flexible and convenient for installation and maintenance; the oil-water heat exchanger 300 can also be arranged near the oil pan of the motor 110, which is conducive to shortening the oil circuit of the motor 110 and reducing the flow resistance of the cooling oil and increasing the heat exchange effect; the oil-water heat exchanger 300 can also be arranged near the oil-oil heat exchanger 200, which is conducive to processing the bases of the two heat exchangers into one base, thereby saving space and reducing the number of parts.

[0045] As for the cooling oil circuit and the lubricating oil circuit, they can be external movable oil pipes or oil channels processed on the housing, the former is convenient for arrangement, installation and maintenance, and the latter can reduce the number of parts and cost. Of course, the oil channels and the oil pipes can be used in combination according to the installation and arrangement requirements, so as to increase flexibility and practicability.

[0046] In summary, the embodiment provides a thermal balance electric axle system, which is a highly integrated electric axle system, including a motor 110, a gearbox 120 and an axle, the motor 110 and the gearbox 120 constitute an electric drive system 100, and the motor 110 drives the gearbox 120 to transmit the rotation speed and torque to the wheel end of the axle.

[0047] More specifically, the gearbox 120 is a positive lubrication gearbox, the first electronic oil pump circulates the lubricating oil inside the gearbox 120, the lubricating oil sprays and lubricates the inside of the gearbox 120, and the outside passes through the oil-oil heat exchanger 200, and the heat from the cooling oil circuit of the motor 110 is absorbed into the lubricating oil circuit of the gearbox 120 through the oil-oil heat exchanger 200.

[0048] The motor 110 is an oil-water composite cooling motor, the second electronic oil pump circulates the cooling oil of the motor 110, the cooling oil sprays and cools the devices inside the motor 110, and the outside passes through the oil-water heat exchanger 300 and the oil-oil heat exchanger 200 in turn, when passing through the oil-water heat exchanger 300, the heat can be transferred to the external water circuit, and when passing through the oil-oil heat exchanger 200, the heat can be transferred to the lubricating oil circuit of the gearbox 120. Of course, in other embodiments of the present application, the motor 110 can also be an oil-cooled motor, and the heat balance inside the electric drive axle system can also be achieved.

[0049] The water circuit comes from the water circulation system of the vehicle thermal management system 600, and the water passes through the oil-water heat exchanger 300 and the outer water jacket 111 of the motor 110, and the heat of the cooling oil circuit of the motor 110 is taken away through the oil-water heat exchanger 300, and the heat of the shell of the motor 110 is taken away through the outer water jacket 111 of the motor 110

[0050] That is, the heat balance electric drive axle system provided by the embodiment can realize the heat transfer from the motor 110 to the gearbox 120, achieve the purposes of heat dissipation of the motor 110, temperature rise of the gearbox 120, heat balance inside the electric drive system 100, and reduction of the heat dissipation load of the vehicle thermal management system 600, can effectively improve the system energy utilization, stabilize the system working temperature in a certain range, thereby improve the life of the electric drive axle system parts and reduce the failure caused by temperature fluctuation, in short, it has great practical value and economic value for the electric drive axle system and the vehicle.

[0051] Finally, it should be noted that in this text, relational terms such as first and second are used only to distinguish one entity or operation from another, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. Without more limitations, the element defined by the statement "including a" does not exclude the presence of additional identical elements in the process, method, article or equipment including the element.

[0052] The above description of disclosed embodiments enables one of ordinary skill in the art to make or use the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A thermal equalization electric drive axle system, characterized by, The system comprises a motor (110), a gearbox (120) and an oil-oil heat exchanger (200), the motor side of the oil-oil heat exchanger (200) is communicated with the cooling oil circuit of the motor (110), and the gearbox side of the oil-oil heat exchanger (200) is communicated with the lubricating oil circuit of the gearbox (120).

2. The thermal equalization electric drive axle system of claim 1, wherein, The system further comprises a water circulation system and an oil-water heat exchanger (300), the water side of the oil-water heat exchanger (300) is communicated with the water circulation system, the oil side of the oil-water heat exchanger (300) is communicated with the cooling oil circuit of the motor (110), and the oil-water heat exchanger (300) is used for transferring the cold or heat of the water of the water circulation system to the cooling oil of the motor (110).

3. The thermal equalization electric drive axle system of claim 2, wherein, The oil side of the oil-water heat exchanger (300) and the motor side of the oil-oil heat exchanger (200) are connected in series, and the cooling oil of the motor (110) flows through the oil-water heat exchanger (300) and then flows through the oil-oil heat exchanger (200).

4. The thermal equalization electric drive axle system of claim 3, wherein, The motor (110) is provided with an outer water jacket (111), and the water of the water circulation system flows through the outer water jacket (111) to cool or heat the shell of the motor (110).

5. The thermal equalization electric drive axle system of claim 4, wherein, The water side of the oil-water heat exchanger (300) and the outer water jacket (111) are connected in series, and the water of the water circulation system flows through the oil-water heat exchanger (300) and then flows through the outer water jacket (111).

6. A thermal equalization electric drive axle system according to any one of claims 2-5, characterized in that, The water circulation system belongs to a whole vehicle thermal management system (600).

7. A thermal equalization electric drive axle system according to any one of claims 1-5, characterized in that, The motor (110) can be locked to heat the cooling oil therein.

8. The thermal equalization electric drive axle system of any one of claims 1-5, wherein, The oil outlet end of the gearbox (120) is provided with a first oil pump (400), and / or the oil outlet end of the motor (110) is provided with a second oil pump (500).

9. A thermal equalization electric drive axle system according to any one of claims 1-5, characterized in that, The motor (110) is provided with at least one of a winding end spraying structure, a bearing spraying structure and a stator spraying structure, all of which are connected with the oil outlet end of the motor side of the oil-oil heat exchanger (200). And / or, the gearbox (120) is provided with at least one of a gear meshing point oil nozzle and a bearing oil nozzle, both of which are connected with the oil outlet end of the gearbox side of the oil-oil heat exchanger (200).

10. A thermal equalization electric drive axle system according to any one of claims 2-5, characterized in that, The shells of the motor (110) and the gearbox (120) are integrated into an electric drive system shell. The oil-oil heat exchanger (200) is arranged in the electric drive system shell, or the oil-oil heat exchanger (200) is arranged in or close to the oil pan of the gearbox (120). The oil-water heat exchanger (300) is arranged in the electric drive system shell, or the oil-water heat exchanger (300) is arranged close to the oil pan of the motor (110), or the oil-water heat exchanger (300) is arranged close to the oil-oil heat exchanger (200).

Images