Hybrid power gearbox and vehicle

Abstract

The invention provides a hybrid power gearbox and a vehicle, and belongs to the technical field of vehicles. The hybrid power gearbox comprises a shell, a first motor, a second motor, a transmission assembly and a differential mechanism. The shell is provided with a motor cavity, a transmission cavity, a first shaft hole, a second shaft hole, a first oil return hole and a second oil return hole; the height of the bottom surface of the motor cavity is gradually reduced from the first motor to the second motor; an output shaft of the first motor and an output shaft of the second motor extend into the transmission cavity through the first shaft hole and the second shaft hole correspondingly and are in transmission connection with the transmission assembly. The first oil return hole and the second oil return hole are both communicated with the motor cavity and the transmission cavity, the first oil return hole is located in the position, close to the second motor and the bottom face of the motor cavity, of the shell, and the second oil return hole is located in the position, close to the first motor and the bottom face of the motor cavity, of the shell. By the adoption of the hybrid power gearbox, the mechanical efficiency of the hybrid power gearbox is improved.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of vehicles, in particular to a hybrid transmission and a vehicle. BACKGROUND

[0002] The hybrid transmission is a kind of core power transmission device of the vehicle, which realizes power distribution and energy efficiency optimization by integrating motor differential and other components. Generally, the hybrid transmission comprises a housing, a first motor, a second motor, a transmission assembly and a differential, the housing is provided with a motor cavity and a transmission cavity, the first motor and the second motor are located in the motor cavity, the transmission assembly and the differential are located in the transmission cavity, the transmission assembly is in transmission connection with the output shaft of the first motor, the output shaft of the second motor and the differential, in working, the first motor and the second motor drive the differential to rotate through the transmission assembly, and the torque is outputted to the outside through the differential.

[0003] Due to the setting of the double motors in the hybrid transmission, the power density is large, and the lubricating oil is needed to lubricate and cool it. The oil path structure is that the cooling channel is arranged on each of the two motors, and the oil return hole is arranged on the housing to communicate the motor cavity and the transmission cavity. Since the height of the bottom surface of the motor cavity gradually decreases from the first motor to the second motor, the oil return hole is arranged near the second motor, i.e. at the lower position of the motor cavity, so that the oil can be returned better. Correspondingly, the oil path is that the cooled lubricating oil flows into the cooling channel of the motor to cool the motor, then flows out from the cooling channel into the motor cavity, then flows from the motor cavity to the transmission cavity through the oil return hole, and then returns to the oil pan at the bottom of the transmission cavity. Then the cooling system pumps the lubricating oil from the oil pan for cooling, and the cooled lubricating oil flows into the cooling channel of the motor again for circulation cooling.

[0004] Since various extreme conditions of the vehicle or various conditions on the inclined road (for example, extreme uphill and downhill conditions) need to be considered, the oil amount of the lubricating oil is large, which will form a certain accumulation at the bottom of the transmission cavity (i.e. at the oil pan), and the transmission assembly and the differential arranged in the transmission cavity will stir the oil severely during rotation, thereby reducing the mechanical efficiency of the hybrid transmission. SUMMARY

[0005] The present disclosure provides a hybrid transmission and a vehicle, which can solve the technical problems existing in the related art, and the technical scheme is as follows:

[0006] In one aspect, the present disclosure provides a hybrid transmission, which comprises a housing, a first motor, a second motor, a transmission assembly and a differential.

[0007] The housing has a motor cavity, a transmission cavity, a first shaft hole, a second shaft hole, a first oil return hole, and a second oil return hole. The motor cavity is used to accommodate the first motor and the second motor. The height of the bottom surface of the motor cavity gradually decreases from the first motor to the second motor. The transmission cavity is used to accommodate the transmission assembly and the input gear of the differential. The first shaft hole and the second shaft hole are both connected to the motor cavity and the transmission cavity.

[0008] The output shafts of the first motor and the second motor extend from the first shaft hole and the second shaft hole, respectively, into the transmission cavity and are connected to the transmission assembly. The transmission assembly is connected to the input gear of the differential.

[0009] Both the first oil return hole and the second oil return hole are connected to the motor cavity and the transmission cavity. The first oil return hole is located on the bottom surface of the housing near the second motor and near the motor cavity, and the second oil return hole is located on the bottom surface of the housing near the first motor and near the motor cavity.

[0010] In one possible implementation, the housing includes a rear end cover, a front end cover, and a main housing;

[0011] The main housing is located between the rear end cover and the front end cover, and both sides of the main housing are connected to the rear end cover and the front end cover respectively. The motor cavity is formed between the main housing and the rear end cover, and the transmission cavity is formed between the main housing and the front end cover.

[0012] The first shaft hole, the second shaft hole, the first oil return hole, and the second oil return hole are all located on the main housing.

[0013] In one possible implementation, the housing also has a third oil return hole, which is located between the first motor and the second motor on the housing and near the bottom surface of the motor cavity.

[0014] In one possible implementation, the transmission assembly includes a first gear, a second gear, a third gear, a bearing, and an intermediate shaft;

[0015] The first gear is coaxially connected to the output shaft of the first motor;

[0016] The second gear is coaxially connected to the output shaft of the second motor;

[0017] The third gear meshes with the first gear and the second gear respectively;

[0018] One end of the intermediate shaft is rotatably connected to the housing via the bearing, and the other end of the intermediate shaft is coaxially connected to the third gear. The outer side of the middle part of the intermediate shaft has teeth that mesh with the input gear of the differential.

[0019] In one possible implementation, the housing has a bearing seat for accommodating the bearing, and the bottom surface of the bearing seat has the second oil return hole.

[0020] In one possible implementation, the bottom surface of the bearing housing also has an oil storage groove, which is located below the second oil return hole and communicates with the second oil return hole.

[0021] In one possible implementation, the bearing housing has an oil guide channel on its side, one end of which is connected to the second oil return hole, and the other end of which is connected to the transmission cavity.

[0022] In one possible implementation, the housing also has an oil guide rib that is inclined from top to bottom. The first end of the oil guide rib is located below the second oil return hole and is used to receive the lubricating oil flowing out of the second oil return hole. The second end of the oil guide rib extends downward to the bottom of the transmission cavity.

[0023] In one possible implementation, the first end of the oil guide rib is located below the second oil return hole on the side closer to the input gear of the differential, and the other end of the oil guide rib extends toward the side away from the input gear of the differential.

[0024] On the other hand, this disclosure provides a vehicle that includes a hybrid transmission as described in any of the preceding claims.

[0025] The technical solution provided in this disclosure includes at least the following beneficial effects:

[0026] This disclosure provides a hybrid power transmission with two oil return holes on its housing: a first oil return hole and a second oil return hole. The first oil return hole is located near the second motor and close to the bottom surface of the motor cavity, while the second oil return hole is located near the first motor and close to the bottom surface of the motor cavity. This allows a portion of the lubricating oil flowing from the motor to return through the first oil return hole, while the remaining lubricating oil can directly return through the second oil return hole. In particular, the lubricating oil flowing from the first motor can directly return through the nearby second oil return hole. Compared to the oil path in related technologies where the lubricating oil from the first motor needs to flow through almost the entire length of the motor cavity to reach the oil return hole located at a lower position within the motor cavity, the second oil return hole in this disclosure significantly reduces the oil path and the amount of oil required along the path. This reduces the total amount of oil needed in the hybrid power transmission, lowers the accumulated oil height at the bottom of the transmission cavity, and thus reduces the degree of oil churning in the transmission components and differential within the transmission cavity, thereby improving the mechanical efficiency of the hybrid power transmission.

[0027] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is an exploded structural diagram of a hybrid power transmission according to an embodiment of this disclosure;

[0030] Figure 2 This is a schematic cross-sectional view of a housing and a first motor according to an embodiment of this disclosure;

[0031] Figure 3 This is a schematic diagram of the structure of a main housing as shown in an embodiment of this disclosure;

[0032] Figure 4 This is a schematic diagram of the structure of a main housing as shown in an embodiment of this disclosure;

[0033] Figure 5 This is a schematic cross-sectional view of a hybrid power transmission according to an embodiment of this disclosure.

[0034] Legend

[0035] 1. Shell;

[0036] 1A, Motor cavity; 1B, Transmission cavity; 1C, First shaft hole; 1D, Second shaft hole; 1F, First oil return hole; 1G, Second oil return hole; 1H, Third oil return hole;

[0037] 11. Rear end cover; 12. Front end cover; 13. Main housing; 14. Bearing housing; 15. Oil guide rib;

[0038] 14A. Oil reservoir groove; 14B. Oil guide channel;

[0039] 2. First motor;

[0040] 21. The output shaft of the first motor;

[0041] 3. Second motor;

[0042] 31. The output shaft of the second motor;

[0043] 4. Transmission components;

[0044] 41. First gear; 42. Second gear; 43. Third gear; 44. Bearing; 45. Intermediate shaft;

[0045] 5. Differential;

[0046] 51. The input gear of the differential. Detailed Implementation

[0047] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” “third,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an” or “a” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “comprising” or “including” and similar terms mean that the element or object preceding “comprising” or “including” encompasses the element or object listed following “comprising” or “including” and its equivalents, and do not exclude other elements or objects. The terms “connected” or “linked” and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms “upper,” “lower,” “left,” “right,” etc., are used only to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described object changes.

[0048] To make the objectives, technical solutions, and advantages of this disclosure clearer, the embodiments of this disclosure will be described in further detail below with reference to the accompanying drawings.

[0049] This disclosure provides a hybrid power transmission, see [link to relevant documentation]. Figure 1 The hybrid transmission includes a housing 1, a first motor 2, a second motor 3, a transmission assembly 4, and a differential 5.

[0050] See Figure 2 The housing 1 has a motor cavity 1A, a transmission cavity 1B, a first shaft hole 1C, a second shaft hole 1D, a first oil return hole 1F, and a second oil return hole 1G. Each of the four holes, namely the first shaft hole 1C, the second shaft hole 1D, the first oil return hole 1F, and the second oil return hole 1G, is connected to the motor cavity 1A and the transmission cavity 1B.

[0051] The motor cavity 1A is used to accommodate the first motor 2 and the second motor 3. That is, the first motor 2 and the second motor 3 are located in the motor cavity 1A and are connected to the housing 1. The height of the axis of the output shaft 21 of the first motor 2 is higher than the height of the axis of the output shaft 31 of the second motor 3. Therefore, the height of the bottom surface of the motor cavity 1A gradually decreases from the first motor 2 to the second motor 3. That is, the bottom surface of the motor cavity 1A is an inclined surface, and the height of the inclined surface decreases sequentially from the first motor 2 to the second motor 3.

[0052] The transmission cavity 1B is used to accommodate the input gear 51 of the transmission assembly 4 and the differential 5, that is, the input gear 51 of the transmission assembly 4 and the differential 5 is located in the transmission cavity 1B. The first shaft hole 1C and the second shaft hole 1D are both connected to the motor cavity 1A and the transmission cavity 1B.

[0053] See Figure 3 and Figure 4 The output shaft 21 of the first motor 2 and the output shaft 31 of the second motor 3 extend from the first shaft hole 1C and the second shaft hole 1D into the transmission cavity 1B, respectively, and are connected to the transmission assembly 4. The transmission assembly 4 is connected to the input gear 51 of the differential 5.

[0054] In practice, one end of the output shaft 21 of the first motor 2 is located in the motor cavity 1A, while the other end of the output shaft 21 of the first motor 2 extends from the first shaft hole 1C into the transmission cavity 1B and is connected to the transmission assembly 4.

[0055] When the first motor 2 is working, the output shaft 21 of the first motor 2 rotates, thereby driving the transmission assembly 4 and the input gear 51 of the differential 5 to rotate in sequence. The hybrid transmission outputs rotational torque to the outside through the differential 5.

[0056] Similarly, one end of the output shaft 31 of the second motor 3 is located in the motor cavity 1A, while the other end of the output shaft 31 of the second motor 3 extends from the second shaft hole 1D into the transmission cavity 1B and is connected to the transmission assembly 4.

[0057] When the second motor 3 is working, the output shaft 31 of the second motor 3 rotates, thereby driving the transmission assembly 4 and the input gear 51 of the differential 5 to rotate in sequence. The hybrid transmission outputs rotational torque to the outside through the differential 5.

[0058] In this embodiment of the disclosure, when the required rotational torque is small, it can be driven by only the first motor 2. When the required rotational torque is large, it can be driven by both the first motor 2 and the second motor 3. This embodiment of the disclosure does not limit its working mode.

[0059] See Figure 3 and Figure 4 The first oil return hole 1F and the second oil return hole 1G are both connected to the motor cavity 1A and the transmission cavity 1B. The first oil return hole 1F is located on the bottom surface of the housing 1 near the second motor 3 and near the motor cavity 1A, and the second oil return hole 1G is located on the bottom surface of the housing 1 near the first motor 2 and near the motor cavity 1A.

[0060] In practice, the housing 2 has an oil inlet hole, and the housings of the first motor 2 and the second motor 3 are both provided with cooling channels. The oil inlet hole is connected to the cooling channels of the first motor 2 and the second motor 3.

[0061] When the first motor 2 needs to be cooled, the cooled lubricating oil can flow into the cooling channel of the first motor 2 through the oil inlet. The lubricating oil then flows through the first motor 2 to cool it down. After absorbing heat, the lubricating oil flows out through the other end of the cooling channel of the first motor 2 into the motor cavity 1A. The lubricating oil accumulates on the bottom surface of the motor cavity 1A and then flows through the inclined bottom surface of the motor cavity 1A into the first return oil hole 1F and the second return oil hole 1G respectively. It then flows through the first return oil hole 1F and the second return oil hole 1G to the transmission cavity 1B and accumulates at the bottom of the transmission cavity 1B. Then, the oil pump can draw lubricating oil from the bottom of the transmission cavity 1B and cool it down through the cooler. The cooled lubricating oil is then pumped back into the oil inlet to cool the first motor 2 again, thus realizing the cooling cycle.

[0062] Similarly, when the second motor 3 needs to be cooled, the cooled lubricating oil can flow into the cooling channel of the second motor 3 through the oil inlet, and then flow through the second motor 3 to cool it down. Then, the lubricating oil that has absorbed heat flows out through the other end of the cooling channel of the second motor 3 into the motor cavity 1A. The lubricating oil that has absorbed heat accumulates on the bottom surface of the motor cavity 1A, and then flows through the inclined bottom surface of the motor cavity 1A. Most of it flows into the first oil return hole 1F, and a small amount of lubricating oil may flow into the second oil return hole 1G. It then flows through the first oil return hole 1F and the second oil return hole 1G into the transmission cavity 1B and accumulates at the bottom of the transmission cavity 1B. Then, the oil pump can draw lubricating oil from the bottom of the transmission cavity 1B and cool it down through the cooler. The cooled lubricating oil is then pumped back into the oil inlet to cool the second motor 3 again, thus realizing the cooling cycle.

[0063] In this way, a portion of the lubricating oil flowing out from the motors (first motor 2 and second motor 3) can be returned through the first return oil hole 1F, while the remaining lubricating oil flowing out from the motors can be directly returned through the second return oil hole 1G. In particular, a portion of the lubricating oil flowing out from the first motor 2 can be directly returned through the second return oil hole 1G near it. Compared with the oil path in the related art where the lubricating oil flowing out from the first motor 2 needs to flow through almost the entire length of the motor cavity 1A and reach the return oil hole set at a lower position in the motor cavity 1A, the second return oil hole 1G in this embodiment can greatly reduce the oil path and the amount of oil required along the oil path, thereby reducing the total amount of oil added to the hybrid transmission and lowering the accumulated oil height at the bottom of the transmission cavity 1B. This reduces the degree of oil churning in the transmission assembly 4 and the differential 5 in the transmission cavity 1B, and improves the mechanical efficiency of the hybrid transmission.

[0064] In one possible implementation, see Figure 1 The housing 1 includes a rear cover 11, a front cover 12, and a main housing 13.

[0065] The main housing 13 is located between the rear end cover 11 and the front end cover 12, and the two sides of the main housing 13 are connected to the rear end cover 11 and the front end cover 12 respectively. The main housing 13 and the rear end cover 11 form a motor cavity 1A, and the main housing 13 and the front end cover 12 form a transmission cavity 1B.

[0066] The first shaft hole 1C, the second shaft hole 1D, the first oil return hole 1F, and the second oil return hole 1G are all located on the main housing 13.

[0067] In this way, easy assembly and disassembly can be achieved through the rear cover 11, the front cover 12, and the main housing 13.

[0068] In one possible implementation, see Figure 3and Figure 4 The housing 1 also has a third oil return hole 1H, which is located between the first motor 2 and the second motor 3 on the housing 1 and near the bottom surface of the motor cavity 1A.

[0069] In practice, the lubricating oil is returned through the first return oil hole 1F, the second return oil hole 1G, and the third return oil hole 1H, which improves the circulation efficiency of the lubricating oil, thereby reducing the total amount of oil needed for the hybrid transmission and lowering the accumulated oil level at the bottom of the transmission chamber 1B. This reduces the degree of oil churning in the transmission assembly 4 and the differential 5 within the transmission chamber 1B, thus improving the mechanical efficiency of the hybrid transmission.

[0070] In one possible implementation, see Figure 1 and Figure 5 The transmission assembly 4 includes a first gear 41, a second gear 42, a third gear 43, a bearing 44, and an intermediate shaft 45.

[0071] The first gear 41 is coaxially connected to the output shaft 21 of the first motor 2.

[0072] The second gear 42 is coaxially connected to the output shaft 31 of the second motor 3.

[0073] The third gear 43 meshes with the first gear 41 and the second gear 42 respectively.

[0074] One end of the intermediate shaft 45 is rotatably connected to the housing 1 via a bearing 44, and the other end of the intermediate shaft 45 is coaxially connected to the third gear 43. The outer side of the middle part of the intermediate shaft 45 has teeth that mesh with the input gear 51 of the differential 5.

[0075] In this way, when the first motor 2 is working, the rotation of the output shaft 21 of the first motor 2 can sequentially drive the first gear 41, the third gear 43, the intermediate shaft 45, and the input gear 51 of the differential 5 to rotate, so as to realize the rotational torque output of the hybrid transmission.

[0076] When the second motor 3 is working, the rotation of the output shaft 31 of the second motor 3 can sequentially drive the second gear 42, the third gear 43, the intermediate shaft 45, and the input gear 51 of the differential 5 to rotate, so as to realize the rotational torque output of the hybrid transmission.

[0077] It is understood that the structure of the transmission component 4 described above is only one possible structure listed. The transmission component 4 can also be any other reasonable transmission structure. This disclosure does not specifically limit this.

[0078] In one possible implementation, see Figure 2 and Figure 5The housing 1 has a bearing seat 14 for accommodating the bearing 44. The bottom surface of the bearing seat 14 has a second oil return hole 1G. (See attached image) Figure 3 and Figure 4 .

[0079] In this way, by integrating the second oil return hole 1G onto the bearing housing 14, on the one hand, the second oil return hole 1G does not need to occupy the space of other devices, and on the other hand, the lubricating oil flowing out from the second oil return hole 1G can accurately lubricate the bearing 44 installed in the bearing housing 14, thereby improving the mechanical efficiency of the bearing 44 and thus improving the overall mechanical efficiency of the hybrid transmission.

[0080] In one possible implementation, see Figure 3 and Figure 4 The bottom surface of the bearing housing 14 also has an oil storage groove 14A, which is located below the second oil return hole 1G and is connected to the second oil return hole 1G.

[0081] In this way, the oil reservoir 14A can store a certain amount of lubricating oil, thereby providing sufficient lubricating oil for the bearing 44, thus improving the mechanical efficiency of the bearing 44, and further improving the overall mechanical efficiency of the hybrid transmission.

[0082] The shape of the oil storage groove 14A can be any reasonable shape, for example, see Figure 3 and Figure 4 One side of the oil storage groove 14A can be connected to the second oil return hole 1G, and the other side of the oil storage groove 14A can be located on the side wall of the bearing seat 14. In this way, the oil storage groove 14A can store a certain amount of lubricating oil while also guiding excess lubricating oil to the side wall of the bearing seat 14 and then flowing out from the gap between the bearing 44 and the side wall of the bearing seat 14.

[0083] Furthermore, another groove can be opened on the bottom surface of the energy storage groove 14A to enhance the oil storage capacity of the oil storage groove 14A.

[0084] In one possible implementation, see Figure 3 and Figure 4 The bearing housing 14 has an oil guide channel 14B on its side. One end of the oil guide channel 14B is connected to the second oil return hole 1G, and the other end of the oil guide channel 14B is connected to the transmission cavity 1B.

[0085] In this way, excess lubricating oil can be guided out of the bearing housing 14 through the oil guide channel 14B, thereby improving the circulation efficiency of the lubricating oil, which in turn reduces the total amount of oil needed for the hybrid transmission, lowers the accumulated oil level at the bottom of the transmission chamber 1B, and thus reduces the degree of oil churning in the transmission assembly 4 and differential 5 in the transmission chamber 1B, thereby improving the mechanical efficiency of the hybrid transmission.

[0086] It is understandable that when there is an oil storage groove 14A on the bottom surface of the bearing housing 14, one end of the oil guide channel 14B can be connected to the oil storage groove 14A, and the connection between the oil storage groove 14A and the second oil return hole 1G can be achieved through the oil storage groove 14A.

[0087] In one possible implementation, see Figure 3 and Figure 4 The housing 1 also has an oil guide rib 15 that is inclined from top to bottom. The first end of the oil guide rib 15 is located below the second oil return hole 1G and is used to receive the lubricating oil flowing out of the second oil return hole 1G. The second end of the oil guide rib 15 extends downward to the bottom of the transmission cavity 1B.

[0088] In this way, the lubricating oil flowing out from the second oil return hole 1G can flow smoothly along the oil guide rib 15 to the bottom of the transmission cavity 1B under the guidance of the oil guide rib 15, avoiding the situation where the lubricating oil splashes directly downward from the second oil return hole 1G to the transmission assembly 4 or the differential 5, thus improving the mechanical efficiency of the hybrid transmission.

[0089] Further, see Figure 3 and Figure 4 The first end of the oil guide rib 15 is located below the side of the second oil return hole 1G near the input gear 51 of the differential 5, and the other end of the oil guide rib 15 extends toward the side away from the input gear 51 of the differential 5.

[0090] In this way, the oil guide rib 15 prevents the lubricating oil flowing out of the second oil return hole 1G from splashing directly onto the transmission assembly 4 or the differential 5, thereby further improving the mechanical efficiency of the hybrid transmission.

[0091] In summary, the hybrid transmission provided in this embodiment can return lubricating oil through the first return oil hole 1F and the second return oil hole 1G. A portion of the lubricating oil flowing out of the motor can be returned through the first return oil hole 1F, while the remaining lubricating oil flowing out of the motor can be directly returned through the second return oil hole 1G. In particular, a portion of the lubricating oil flowing out of the first motor 2 can be directly returned through the nearby second return oil hole 1G, which can greatly reduce the oil path and the amount of oil required along the oil path, thereby reducing the total amount of oil added to the hybrid transmission and lowering the accumulated oil height at the bottom of the transmission cavity 1B. This reduces the degree of oil churning in the transmission assembly 4 and the differential 5 in the transmission cavity 1B, and improves the mechanical efficiency of the hybrid transmission.

[0092] This disclosure also provides a vehicle that includes a hybrid power transmission as described in any of the preceding embodiments.

[0093] The technical solution provided in this disclosure includes at least the following beneficial effects:

[0094] This disclosure provides a hybrid power transmission with two oil return holes on its housing 1: a first oil return hole 1F and a second oil return hole 1G. The first oil return hole 1F is located near the bottom surface of the second motor 3 and the motor cavity 1A, while the second oil return hole 1G is located near the bottom surface of the first motor 2 and the motor cavity 1A. This allows a portion of the lubricating oil flowing out of the motors to return through the first oil return hole 1F, while the remaining lubricating oil can directly return through the second oil return hole 1G, particularly the portion of lubricating oil flowing out of the first motor 2. The lubricating oil can be directly returned from the second return oil hole 1G nearby. Compared with the oil path in the related technology where the lubricating oil flowing out of the first motor 2 needs to flow through almost the entire length of the motor cavity 1A and to the return oil hole set at the lower position of the motor cavity 1A, the second return oil hole 1G in this disclosure can greatly reduce the oil path and the amount of oil required in the oil path, thereby reducing the total amount of oil added to the hybrid transmission and reducing the accumulated oil height at the bottom of the transmission cavity 1B. This reduces the degree of oil churning in the transmission assembly 4 and the differential 5 in the transmission cavity 1B and improves the mechanical efficiency of the hybrid transmission.

[0095] The above description is merely an optional embodiment of this disclosure and is not intended to limit this disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the protection scope of this disclosure.

Claims

1. A hybrid power transmission, characterized in that, The hybrid transmission includes a housing (1), a first motor (2), a second motor (3), a transmission assembly (4), and a differential (5); The housing (1) has a motor cavity (1A), a transmission cavity (1B), a first shaft hole (1C), a second shaft hole (1D), a first oil return hole (1F), and a second oil return hole (1G). The motor cavity (1A) is used to accommodate the first motor (2) and the second motor (3). The height of the bottom surface of the motor cavity (1A) gradually decreases from the first motor (2) to the second motor (3). The transmission cavity (1B) is used to accommodate the transmission assembly (4) and the input gear (51) of the differential (5). The first shaft hole (1C) and the second shaft hole (1D) are both connected to the motor cavity (1A) and the transmission cavity (1B). The output shaft (21) of the first motor (2) and the output shaft (31) of the second motor (3) extend from the first shaft hole (1C) and the second shaft hole (1D) into the transmission cavity (1B) respectively, and are connected to the transmission assembly (4) in a transmission manner. The transmission assembly (4) is connected to the input gear (51) of the differential (5) in a transmission manner. The first oil return hole (1F) and the second oil return hole (1G) are both connected to the motor cavity (1A) and the transmission cavity (1B). The first oil return hole (1F) is located on the bottom surface of the housing (1) near the second motor (3) and near the motor cavity (1A). The second oil return hole (1G) is located on the bottom surface of the housing (1) near the first motor (2) and near the motor cavity (1A).

2. The hybrid power transmission according to claim 1, characterized in that, The housing (1) includes a rear end cover (11), a front end cover (12), and a main housing (13); The main housing (13) is located between the rear end cover (11) and the front end cover (12), and the two sides of the main housing (13) are respectively connected to the rear end cover (11) and the front end cover (12). The motor cavity (1A) is formed between the main housing (13) and the rear end cover (11), and the transmission cavity (1B) is formed between the main housing (13) and the front end cover (12). The first shaft hole (1C), the second shaft hole (1D), the first oil return hole (1F), and the second oil return hole (1G) are all located on the main housing (13).

3. The hybrid power transmission according to claim 1, characterized in that, The housing (1) also has a third oil return hole (1H), which is located between the first motor (2) and the second motor (3) on the housing (1) and near the bottom surface of the motor cavity (1A).

4. The hybrid power transmission according to claim 1, characterized in that, The transmission assembly (4) includes a first gear (41), a second gear (42), a third gear (43), a bearing (44), and an intermediate shaft (45); The first gear (41) is coaxially connected to the output shaft (21) of the first motor (2); The second gear (42) is coaxially connected to the output shaft (31) of the second motor (3); The third gear (43) meshes with the first gear (41) and the second gear (42) respectively; One end of the intermediate shaft (45) is rotatably connected to the housing (1) via the bearing (44), and the other end of the intermediate shaft (45) is coaxially connected to the third gear (43). The outer side of the middle part of the intermediate shaft (45) has teeth that mesh with the input gear (51) of the differential (5).

5. The hybrid power transmission according to claim 4, characterized in that, The housing (1) has a bearing seat (14) for accommodating the bearing (44), and the bottom surface of the bearing seat (14) has a second oil return hole (1G).

6. The hybrid power transmission according to claim 5, characterized in that, The bearing housing (14) also has an oil storage groove (14A) on its bottom surface. The oil storage groove (14A) is located below the second oil return hole (1G) and is connected to the second oil return hole (1G).

7. The hybrid power transmission according to claim 5, characterized in that, The bearing housing (14) has an oil guide channel (14B) on its side. One end of the oil guide channel (14B) is connected to the second oil return hole (1G), and the other end of the oil guide channel (14B) is connected to the transmission cavity (1B).

8. The hybrid power transmission according to any one of claims 1 to 7, characterized in that, The housing (1) also has an oil guide rib (15) that is inclined from top to bottom. The first end of the oil guide rib (15) is located below the second oil return hole (1G) and is used to receive the lubricating oil flowing out of the second oil return hole (1G). The second end of the oil guide rib (15) extends downward to the bottom of the transmission cavity (1B).

9. The hybrid power transmission according to claim 8, characterized in that, The first end of the oil guide rib (15) is located below the second oil return hole (1G) on the side near the input gear (51) of the differential (5), and the other end of the oil guide rib (15) extends toward the side away from the input gear (51) of the differential (5).

10. A vehicle, characterized in that, The vehicle includes a hybrid transmission as described in any one of claims 1 to 9.

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