Hybrid drive system and electric vehicle

Abstract

The application discloses a hybrid power driving system and an electric vehicle, wherein the hybrid power driving system comprises a shell, a generator and a driving motor. According to the above scheme, when the first oil return channel cannot work normally, the second oil return channel can work normally; or when the second oil return channel cannot work normally, the first oil return channel can work normally, so that at least one side of the two oil return channels can return oil normally when the electric vehicle encounters limit working conditions such as slope change, the oil in the oil collecting pool is prevented from being sucked empty, the safety guarantee of the cooling performance is increased, the electric driving system is protected from performance decline or failure due to the overheating of the motor caused by the oil suction in the limit working conditions, and the reliability of the overall system is improved.

Description

Technical Field

[0001] This application relates to the field of automotive technology, and in particular to a hybrid drive system and an electric vehicle. Background Technology

[0002] Currently, all existing hybrid or range-extended electric drive systems are dual-motor structures. Although traditional dual-motor drive systems are designed with an oil return channel, when the electric vehicle is driving on a steep incline, the electric drive system tilts with the electric vehicle, causing the oil to tilt to the other side of the oil return channel. This causes the oil pump to suck in air, affecting the motor's heat dissipation, which in turn leads to excessive temperature rise, resulting in a decrease in motor performance or failure of key components due to lack of timely lubrication. Utility Model Content

[0003] The main objective of this application is to provide a hybrid drive system and electric vehicle that can prevent the motor from overheating due to oil pump cavitation under extreme operating conditions, thereby reducing performance or causing failure and increasing reliability.

[0004] To achieve the above objectives, this application proposes a hybrid power drive system, comprising: a housing, a generator, and a drive motor; Both the generator and the drive motor are disposed inside the housing; The inner wall of the shell is provided with a first oil return channel and a second oil return channel, and the bottom surface of the shell is also provided with an oil collection tank. The first oil return channel and the second oil return channel are respectively connected to the oil collection tank, and the first oil return channel and the second oil return channel are located on both sides of the oil collection tank. When the end of the first return oil passage furthest from the oil collecting pool is below the oil collecting pool, the end of the second return oil passage furthest from the oil collecting pool is above the oil collecting pool; or... When the end of the second return oil passage away from the oil collection pool is located below the oil collection pool, the end of the first return oil passage away from the oil collection pool is located above the oil collection pool.

[0005] In one embodiment, the hybrid drive system further includes a rotary transformer disposed on the drive motor for detecting the position and speed of the rotor in the drive motor.

[0006] In one embodiment, the hybrid drive system further includes a resolver cover disposed on the housing and covering the outside of the resolver.

[0007] In one embodiment, the inner diameters of both the first and second return oil passages are larger than the inner diameter of the inlet passage connected to the oil collection tank.

[0008] In one embodiment, the inner walls of both the first and second oil return channels are smooth surfaces.

[0009] In one embodiment, the hybrid drive system further includes a heating element disposed in the first oil return passage, and / or, the heating element disposed in the second oil return passage.

[0010] In one embodiment, the hybrid drive system further includes a temperature sensor and a controller, wherein the temperature sensor is disposed in the first oil return passage and the second oil return passage, and the controller is electrically connected to the temperature sensor and the heating element, respectively. When the lubricating oil temperature is lower than a first preset value, the controller controls the heating component to start; when the lubricating oil temperature is higher than a second preset value, the controller controls the heating component to turn off.

[0011] In one embodiment, both the first and second oil return channels have removable filters at their inlet ends.

[0012] In one embodiment, both the generator and the drive motor have heat dissipation fins on their surfaces.

[0013] This application also proposes an electric vehicle including a hybrid drive system as described in any one of the embodiments of this application.

[0014] The hybrid drive system provided in this application allows for different configurations. When the end of the first oil return passage furthest from the oil collection sump is below the sump, the end of the second oil return passage furthest from the oil collection sump is above it; or, when the end of the second oil return passage furthest from the oil collection sump is below it, the end of the first oil return passage furthest from the oil collection sump is above it. This ensures that when the first oil return passage malfunctions, the second oil return passage can function normally; or, when the second oil return passage malfunctions, the first oil return passage can function normally. This guarantees that when the electric vehicle encounters extreme conditions such as changes in slope, at least one side of the two oil return passages will return oil normally, preventing the oil in the oil collection sump from being sucked dry. This increases the safety guarantee of cooling performance and protects the electric drive system from performance degradation or failure due to excessive motor temperature rise caused by oil suction under extreme conditions, thus improving the overall system reliability. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of a hybrid power drive system provided in an embodiment of this application; Figure 2 A schematic diagram of a hybrid drive system provided in one embodiment of this application from another perspective.

[0017] Explanation of icon numbers:

[0018] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0020] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0021] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0022] The following is a detailed description of this application.

[0023] This application proposes a hybrid power drive system, with reference to... Figure 1 and combined Figure 2 As shown, Figure 1 This is a schematic diagram of the hybrid drive system provided in this application. Figure 2 A schematic diagram of the hybrid drive system provided in this application from another perspective.

[0024] In this embodiment of the application, the hybrid drive system includes a housing 4, a generator 5, and a drive motor 6, wherein the generator 5 and the drive motor 6 are both disposed inside the housing 4; a first oil return passage 7 and a second oil return passage 8 are provided on the inner wall of the housing 4, and an oil collection pool is also provided on the inner bottom surface of the housing 4; the first oil return passage 7 and the second oil return passage 8 are respectively connected to the oil collection pool, and the first oil return passage 7 and the second oil return passage 8 are located on opposite sides of the oil collection pool; when the end of the first oil return passage 7 away from the oil collection pool is located below the oil collection pool, the end of the second oil return passage 8 away from the oil collection pool is located above the oil collection pool; or, when the end of the second oil return passage 8 away from the oil collection pool is located below the oil collection pool, the end of the first oil return passage 7 away from the oil collection pool is located above the oil collection pool.

[0025] In this embodiment, a motor end cover 2 is connected to the housing 4 by bolts or snap-fit. A bearing seat is installed on the motor end cover 2. The rotors of the generator 5 and the drive motor 6 are fixed on the corresponding bearing seats. The bearing seats support the rotation of the rotor shaft, ensuring the coaxiality between the rotor and the stator, and avoiding mechanical wear or abnormal vibration caused by eccentricity.

[0026] When in use, when the electric vehicle is in extreme climbing conditions, the entire hybrid drive system is also in a tilted state. At this time, when the end of the first oil return channel 7 away from the oil collection pool is below the oil collection pool, the end of the second oil return channel 8 away from the oil collection pool is above the oil collection pool; or, when the end of the second oil return channel 8 away from the oil collection pool is below the oil collection pool, the end of the first oil return channel 7 away from the oil collection pool is above the oil collection pool.

[0027] Because lubricating oil can only flow from the return oil passage into the oil collection sump under the action of gravity, when the end of the first return oil passage 7 furthest from the oil collection sump is below the oil collection sump, and the end of the second return oil passage 8 furthest from the oil collection sump is above the oil collection sump, the lubricating oil, after flowing into the first return oil passage 7, cannot flow from the low point to the high point of the first return oil passage 7. That is, the lubricating oil cannot flow into the oil collection sump from the first return oil passage 7. The lubricating oil can only flow from the high point to the low point in the second return oil passage 8 before flowing into the oil collection sump. Conversely, when the end of the second return oil passage 8 furthest from the oil collection sump is below the oil collection sump, and the end of the first return oil passage 7 furthest from the oil collection sump is above the oil collection sump, the lubricating oil, after flowing into the second return oil passage 8, cannot flow from the low point to the high point of the second return oil passage 8. That is, the lubricating oil cannot flow into the oil collection sump from the second return oil passage 8. The lubricating oil can only flow from the high point to the low point in the first return oil passage 7 before flowing into the oil collection sump.

[0028] This ensures that when electric vehicles encounter extreme conditions such as changes in slope, at least one side of the two oil return channels will return oil normally, preventing the oil in the oil sump from being sucked dry. This increases the safety guarantee of cooling performance and protects the electric drive system from excessive motor temperature rise due to oil suction under extreme conditions, which could lead to performance degradation or failure. This improves the overall system reliability.

[0029] In some embodiments, the hybrid drive system further includes a resolver disposed in the drive motor 6 for detecting the position and speed of the rotor in the drive motor 6. This facilitates the detection of the position and speed of the rotor in the drive motor 6.

[0030] In some embodiments, such as Figure 1 As shown, the hybrid drive system also includes a resolver cover 3, which is disposed on the housing 4 and covers the outside of the resolver.

[0031] In this embodiment, the resolver cover plate 3 can be connected to the housing 4 by bolts or snap-fit, which is not limited here.

[0032] In this embodiment, the rotary transformer is covered by the resolver cover plate 3, which can effectively protect the rotary transformer and prevent it from being damaged by contamination, collisions, etc.

[0033] like Figure 1 As shown, the hybrid drive system also includes an electronic control housing 1, and other components of the hybrid drive system can be located inside the electronic control housing 1 to avoid them from being damaged by contamination, collisions, etc.

[0034] In some embodiments, the inner diameters of the first return oil passage 7 and the second return oil passage 8 are both larger than the inner diameter of the inlet passage connected to the oil collection sump. This effectively prevents internal oil accumulation due to insufficient return oil flow.

[0035] In some embodiments, the inner walls of the first return oil passage 7 and the second return oil passage 8 are both smooth surfaces. This reduces the resistance to oil flow within the return oil passages.

[0036] In some embodiments, the hybrid drive system further includes a heating element disposed in a first return oil passage 7, and / or a heating element disposed in a second return oil passage 8.

[0037] The heating element in this embodiment can be a resistance wire, a PTC heating element, etc., and the specific element can be determined according to the actual situation. This specification does not limit this embodiment.

[0038] In this embodiment, heating components are installed on the first return oil passage 7 and the second return oil passage 8. In this way, when the electric vehicle is cold-started, the return oil passage is preheated by the heating components, which can accelerate the return flow of oil.

[0039] In some embodiments, the hybrid drive system further includes a temperature sensor and a controller. The temperature sensor is disposed in the first oil return passage 7 and the second oil return passage 8, and the controller is electrically connected to the temperature sensor and the heating element, respectively. When the lubricating oil temperature is lower than the first preset value, the controller controls the heating element to start; when the lubricating oil temperature is higher than the second preset value, the controller controls the heating element to turn off.

[0040] In this embodiment, the first preset value can be -10℃ and the second preset value can be 10℃, which is not limited here.

[0041] This implementation measures the temperature of the lubricating oil using a temperature sensor, so as to control the activation of the heating element according to the temperature of the lubricating oil and avoid the lubricating oil temperature being too high or too low.

[0042] In some embodiments, the oil inlet ends of the first return oil passage 7 and the second return oil passage 8 are both provided with removable filters.

[0043] In this embodiment, the filter element is a metal filter screen or a paper filter element, with a mesh size of 80-120 mesh, which facilitates the filtration of impurities in the lubricating oil.

[0044] In some embodiments, both the generator 5 and the drive motor 6 are provided with heat dissipation fins on their surfaces. This facilitates heat dissipation for the generator 5 and the drive motor 6 during operation.

[0045] This application also provides an electric vehicle including a hybrid drive system as described in any of the embodiments of this application.

[0046] The specific structure of the hybrid drive system in this embodiment refers to the above embodiments. Since the electric vehicle adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be repeated here.

[0047] The above description is merely a preferred embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the content of this application's specification and drawings under the concept of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A hybrid power drive system, characterized in that, include: Housing (4), generator (5) and drive motor (6); The generator (5) and the drive motor (6) are both located inside the housing (4); The inner wall of the shell (4) is provided with a first oil return channel (7) and a second oil return channel (8). The bottom surface of the shell (4) is also provided with an oil collection pool. The first oil return channel (7) and the second oil return channel (8) are respectively connected to the oil collection pool. The first oil return channel (7) and the second oil return channel (8) are located on both sides of the oil collection pool. When the end of the first return oil passage (7) away from the oil collection pool is located below the oil collection pool, the end of the second return oil passage (8) away from the oil collection pool is located above the oil collection pool; or, When the end of the second return oil passage (8) away from the oil collection pool is located below the oil collection pool, the end of the first return oil passage (7) away from the oil collection pool is located above the oil collection pool.

2. The hybrid drive system according to claim 1, characterized in that, The hybrid drive system also includes a rotary transformer, which is disposed in the drive motor (6) and is used to detect the position and speed of the rotor in the drive motor (6).

3. The hybrid drive system according to claim 2, characterized in that, The hybrid drive system also includes a resolver cover plate (3), which is disposed on the housing (4) and covers the outside of the resolver.

4. The hybrid drive system according to claim 1, characterized in that, The inner diameter of the first return oil passage (7) and the inner diameter of the second return oil passage (8) are both greater than the inner diameter of the oil inlet passage connected to the oil collection pool.

5. The hybrid drive system according to claim 1, characterized in that, The inner walls of the first return oil passage (7) and the second return oil passage (8) are both smooth surfaces.

6. The hybrid drive system according to claim 1, characterized in that, The hybrid drive system further includes a heating component disposed in the first oil return passage (7), and / or, the heating component disposed in the second oil return passage (8).

7. The hybrid drive system according to claim 6, characterized in that, The hybrid drive system also includes a temperature sensor and a controller. The temperature sensor is disposed in the first oil return passage (7) and the second oil return passage (8). The controller is electrically connected to the temperature sensor and the heating component, respectively. When the lubricating oil temperature is lower than a first preset value, the controller controls the heating component to start; when the lubricating oil temperature is higher than a second preset value, the controller controls the heating component to turn off.

8. The hybrid drive system according to claim 1, characterized in that, The oil inlet ends of the first oil return channel (7) and the second oil return channel (8) are both equipped with detachable filters.

9. The hybrid drive system according to claim 1, characterized in that, The surfaces of both the generator (5) and the drive motor (6) are provided with heat dissipation fins.

10. An electric vehicle, characterized in that, Includes the hybrid drive system as described in any one of claims 1 to 9.

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