An integrated transmission housing and single-motor and dual-motor electric drive axle assemblies

Abstract

The present invention discloses an integrated transmission housing and a single-motor and dual-motor electric drive axle assembly, which solves the problems of insufficient strength of the existing electric drive axle assembly and difficulty in ensuring the sealing of the motor. Specifically, it includes a housing body, a first ring cover, a second ring cover, a third ring cover, a fourth ring cover and a bridge housing connecting plate; the housing body is provided with an input shaft bearing through hole, an output shaft bearing through hole and an intermediate shaft bearing through hole; the first ring cover is arranged on one side of the housing body and surrounds the input shaft bearing through hole, the output shaft bearing through hole and the intermediate shaft bearing through hole; a shift control window is arranged on the side wall of the first ring cover, and a shift fork shaft hole is correspondingly arranged on the inner wall; the second ring cover, the third ring cover and the fourth ring cover are all arranged on the other side of the housing body; the second ring cover is arranged around the input shaft bearing through hole; the third ring cover is arranged around the output shaft bearing through hole; the fourth ring cover is arranged close to the second ring cover; an oil outlet hole is arranged between the fourth ring cover and the second ring cover; the bridge housing connecting plate is fixed on one side of the housing body.

Description

Technical Field

[0001] The present invention relates to a transmission housing, and particularly to an integrated transmission housing and a single-motor or dual-motor electric drive axle assembly. Background Art

[0002] The electric drive axle is considered an important development trend for new energy commercial vehicles. However, the complexity of commercial vehicle operating conditions places higher requirements on the performance and reliability of the electric drive axle.

[0003] As a key component for bearing torque and an important part of the weight of the electric drive axle assembly, the main transmission housing of the drive axle must, on the one hand, meet the strength and reliability requirements under various operating conditions, and a reasonable interface between the axle housing and the motor needs to be designed to ensure the adaptability and sealing performance with the motor, so as to ensure that the housing envelope assembled on the vehicle will not have dynamic interference with other components. On the other hand, lightweight design is required to reduce the weight of the electric drive axle assembly, thereby reducing the unsprung mass. For this reason, on September 28, 2015, BYD Company Limited applied for a related patent named "Electric Drive Axle Assembly and Vehicle with the Same", with the publication number CN105966230A. In this electric drive axle assembly, the power motor is directly fixed on the transmission housing, the differential is directly supported on the transmission housing, and the transmission housing is fixed on the axle housing assembly. Such a combination method not only makes it difficult to meet the strength requirements of the electric drive axle assembly, but also makes it difficult to ensure the sealing performance of the motor, and moreover, it increases the weight of the electric drive axle assembly. Summary of the Invention

[0004] The purpose of the present invention is to provide an integrated transmission housing and a single-motor or dual-motor electric drive axle assembly to solve the technical problems of insufficient strength, difficult-to-guarantee motor sealing performance, and excessive weight of the existing electric drive axle assembly.

[0005] To achieve the above purpose, the present invention provides an integrated transmission housing, which is characterized in that it includes a housing body, a first ring cover, a second ring cover, a third ring cover, a fourth ring cover, and a bridge housing connecting plate;

[0006] Input shaft bearing through holes, output shaft bearing through holes, and intermediate shaft bearing through holes are distributed on the housing body;

[0007] The first ring cover is arranged on one side of the housing body and surrounds the peripheries of the input shaft bearing through holes, output shaft bearing through holes, and intermediate shaft bearing through holes. Its end face is a rear cover joint surface. A shift operation window is provided on the side wall of the first ring cover, and a shift fork shaft hole is provided at the corresponding position on its inner wall;

[0008] The second ring cover, the third ring cover, and the fourth ring cover are all arranged on the other side of the housing body;

[0009] The second shroud is arranged around the input shaft bearing through-hole and is used for installing the motor. A protrusion for installing the motor heat exchanger is provided on its outer wall; an oil inlet hole for the motor heat exchanger to inlet oil is provided on the protrusion.

[0010] The third shroud is arranged around the output shaft bearing through-hole and is used for installing the output shaft bearing. Its end face is the bearing cover joint surface.

[0011] The fourth shroud is arranged close to the second shroud and is used for installing the oil pump; an oil outlet hole for the oil pump to outlet oil is arranged between the fourth shroud and the second shroud.

[0012] The axle housing connecting plate is fixedly arranged on one side of the housing body, and the plane where it is located is perpendicular to the plane where the housing body is located, and is used for connecting the axle housing.

[0013] Furthermore, a differential bearing seat is provided on the side of the axle housing connecting plate away from the housing body.

[0014] Furthermore, the housing body, the first shroud, the second shroud, the third shroud, the fourth shroud, the axle housing connecting plate and the differential bearing seat are of an integral structure.

[0015] Furthermore, a motor end cover is further included;

[0016] The motor end cover is covered on the end of the second shroud away from the housing body.

[0017] Furthermore, an oil passage is provided on the motor end cover; both ends of the oil passage are communicated with the oil inlet hole and the oil outlet hole respectively.

[0018] Furthermore, both the second shroud and the third shroud are circular rings;

[0019] The central axis of the second shroud and the central axis of the input shaft bearing through-hole are on the same straight line;

[0020] The central axis of the third shroud and the central axis of the output shaft bearing through-hole are on the same straight line.

[0021] Meanwhile, the present invention also provides a single-motor electric drive axle assembly, which is characterized in that it includes an integrated transmission housing and an axle housing as described above;

[0022] The integrated transmission housing is located on one side of the axle housing;

[0023] The axle housing connecting plate is detachably connected to the axle housing.

[0024] Furthermore, lubrication holes are provided on both the housing body and the axle housing.

[0025] The present invention also provides a dual-motor electric drive axle assembly, which is characterized in that it includes two integrated transmission housings as described above and an axle housing;

[0026] The two integrated transmission cases are symmetrically arranged on both sides of the axle housing;

[0027] Each axle housing connecting plate is detachably connected to the axle housing.

[0028] Furthermore, lubricating holes are provided on both the case body and the axle housing.

[0029] Advantages of the present invention:

[0030] 1. The integrated transmission case provided by the present invention integrates the motor case, the transmission case, and the main transmission case of the drive axle, greatly reducing the volume of the electric drive axle assembly. At the same time, the structure of the electric drive axle assembly is more compact, lighter in weight, and higher in strength. Using this integrated transmission case, electric drive axle products with multi-stage transmission can be designed to meet the needs of various vehicle configurations. At the same time, the vehicle is lighter in weight, lower in cost, and better in economy.

[0031] 2. The present invention designs the case body, the first ring cover, the second ring cover, the third ring cover, the fourth ring cover, the axle housing connecting plate, and the differential bearing seat as an integrated structure. On the one hand, this reduces the interfaces between parts and can effectively avoid the risk of oil leakage. On the other hand, it also ensures the sealing of the motor.

[0032] 3. The dual-motor electric drive axle assembly provided by the present invention can not only give full play to the advantages of the high-efficiency range of each motor but also achieve shift without power interruption, greatly improving the comfort and power performance of the whole vehicle.

[0033] 4. The through holes for the intermediate shaft bearings in the present invention can be arranged in one stage or multiple stages according to actual transmission requirements to achieve two to five-stage transmission and maximize the output torque. Description of the Drawings

[0034] Figure 1 is one of the three-dimensional structure diagrams of Embodiment 1 of an integrated transmission case of the present invention;

[0035] Figure 2 is the second three-dimensional structure diagram of Embodiment 1 of an integrated transmission case of the present invention;

[0036] Figure 3 is the three-dimensional structure diagram of an embodiment of a single-motor electric drive axle assembly of the present invention;

[0037] Figure 4 is one of the three-dimensional structure diagrams of Embodiment 2 of an integrated transmission case of the present invention;

[0038] Figure 5 is the second three-dimensional structure diagram of Embodiment 2 of an integrated transmission case of the present invention;

[0039] Figure 6 It is a three-dimensional structural schematic diagram of an embodiment of a dual-motor electric drive axle assembly of the present invention.

[0040] Reference numerals in the drawings:

[0041] 1 - differential bearing seat, 2 - shift fork shaft hole, 3 - shift operation window, 4 - input shaft bearing through hole, 5 - axle housing connecting plate, 6 - first ring cover, 7 - output shaft bearing through hole, 8 - intermediate shaft bearing through hole, 9 - second ring cover, 10 - protrusion, 11 - fourth ring cover, 12 - third ring cover, 13 - motor end cover, 14 - motor heat exchanger, 15 - housing body, 16 - oil inlet hole, 17 - oil outlet hole, 18 - oil passage, 19 - axle housing. Specific embodiments

[0042] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0043] Embodiment 1 of the present invention provides an integrated transmission housing, in combination with Figure 1 and Figure 2 as shown, including a housing body 15, a first ring cover 6, a second ring cover 9, a third ring cover 12, a fourth ring cover 11, and an axle housing connecting plate 5;

[0044] The input shaft bearing through-hole 4, the output shaft bearing through-hole 7 and the intermediate shaft bearing through-hole 8 are distributed on the housing body 15; the first ring cover 6 is arranged on one side of the housing body 15 and surrounds the peripheries of the input shaft bearing through-hole 4, the output shaft bearing through-hole 7 and the intermediate shaft bearing through-hole 8. The end face of the first ring cover 6 far away from the housing body 15 is the rear cover joint surface, and a suitable rear cover can be designed according to the specific vehicle model to match the housing body 15; a shift control window 3 is arranged on the side wall of the first ring cover 6, and a shift device can be installed. A shift fork shaft hole 2 is arranged at the corresponding position on the inner wall for installing a shift fork shaft and realizing gear position self-locking; the second ring cover 9, the third ring cover 12 and the fourth ring cover 11 are all arranged on the other side of the housing body 15; the second ring cover 9 is arranged around the input shaft bearing through-hole 4 for installing a motor, and a protrusion 10 for installing a motor heat exchanger 14 is arranged on its outer wall; an oil inlet hole 16 for the motor heat exchanger 14 to inlet oil is arranged on the protrusion 10; a motor end cover 13 is installed at the end of the second ring cover 9 far away from the housing body 15, and an oil passage 18 is arranged on the motor end cover 13; both ends of the oil passage 18 are communicated with the oil inlet hole 16 and an oil outlet hole 17 respectively. The third ring cover 12 is arranged around the output shaft bearing through-hole 7 for installing an output shaft bearing. The end face of the third ring cover 12 far away from the housing body 15 is the bearing cover joint surface, and a suitable bearing cover can be designed according to the specific vehicle model to match the housing body 15; the fourth ring cover 11 is arranged close to the second ring cover 9 for installing an electronic oil pump or a mechanical oil pump; an oil outlet hole 17 for the oil pump to outlet oil is arranged between the fourth ring cover 11 and the second ring cover 9; a bridge housing connecting plate 5 is fixedly arranged on one side of the housing body 15, and the plane where it is located is perpendicular to the plane where the housing body 15 is located for connecting the bridge housing; a differential bearing seat 1 is arranged on the side of the bridge housing connecting plate 5 far away from the housing body 15. The housing body 15, the first ring cover 6, the second ring cover 9, the third ring cover 12, the fourth ring cover 11, the bridge housing connecting plate 5 and the differential bearing seat 1 are of an integral structure. Among them, both the second ring cover 9 and the third ring cover 12 are circular rings; the central axis of the second ring cover 9 and the central axis of the input shaft bearing through-hole 4 are on the same straight line; the central axis of the third ring cover 12 and the central axis of the output shaft bearing through-hole 7 are on the same straight line.

[0045] The integrated transmission housing integrates the main motor housing (i.e., the second ring cover 9) and the differential bearing seat 1 onto the transmission housing (i.e., the housing body 15), and realizes the installation of the original three types of parts through an integrated housing. The integrated housing includes installation positions for the motor rotor, stator, motor heat exchanger, etc.; an oil passage 18 is provided on the integrated housing between the oil outlet hole 17 for the oil pump to discharge oil and the oil inlet hole 16 on the protrusion 10; lubricating oil passes through this oil passage 18 and is transported by the oil pump to the motor heat exchanger. After the lubricating oil is cooled by the motor heat exchanger, it flows into the motor to cool the stator and rotor; input shaft bearing through holes 4, output shaft bearing through holes 7, and intermediate shaft bearing through holes 8 are distributed on the housing body; corresponding transmission mechanisms can be directly assembled. When the integrated transmission housing is connected to a traditional rear axle, an electric drive axle product with a compact installation, small volume, and light weight can be formed, which is applied to various new energy vehicles.

[0046] As Figure 3 shown, an embodiment of the present invention provides a single-motor electric drive axle assembly, including a housing body 15, a first ring cover 6, a second ring cover 9, a third ring cover 12, a fourth ring cover 11, a bridge housing connecting plate 5, and a bridge housing 19; the housing body 15, the first ring cover 6, the second ring cover 9, the third ring cover 12, the fourth ring cover 11, and the bridge housing connecting plate 5 are all arranged on one side of the bridge housing 19.

[0047] The housing body 15 is provided with an input shaft bearing through-hole 4, an output shaft bearing through-hole 7, and an intermediate shaft bearing through-hole 8; the first ring cover 6 is arranged on one side of the housing body 15 and surrounds the peripheries of the input shaft bearing through-hole 4, the output shaft bearing through-hole 7, and the intermediate shaft bearing through-hole 8. The end face of the first ring cover 6 far from the housing body 15 is a rear cover joint surface, and a suitable rear cover can be designed according to the specific vehicle model to match the housing body 15; a shift operation window 3 is provided on the side wall of the first ring cover 6, and a shift device can be installed. A shift fork shaft hole 2 is provided at the corresponding position on the inner wall thereof for installing a shift fork shaft and realizing gear position self-locking; the second ring cover 9, the third ring cover 12, and the fourth ring cover 11 are all arranged on the other side of the housing body 15; the second ring cover 9 is arranged around the input shaft bearing through-hole 4 for installing a motor, and a protrusion 10 for installing a motor heat exchanger 14 is provided on its outer wall; an oil inlet hole 16 for the motor heat exchanger 14 to inlet oil is provided on the protrusion 10; a motor end cover 13 is installed at one end of the second ring cover 9 far from the housing body 15, and an oil passage 18 is provided on the motor end cover 13; both ends of the oil passage 18 are communicated with the oil inlet hole 16 and an oil outlet hole 17 respectively. The third ring cover 12 is arranged around the output shaft bearing through-hole 7 for installing an output shaft bearing. The end face of the third ring cover 12 far from the housing body 15 is a bearing cover joint surface, and a suitable bearing cover can be designed according to the specific vehicle model to match the housing body 15; the fourth ring cover 11 is arranged close to the second ring cover 9 for installing an electronic oil pump or a mechanical oil pump; an oil outlet hole 17 for the oil pump to outlet oil is provided between the fourth ring cover 11 and the second ring cover 9; a bridge housing connecting plate 5 is fixedly arranged on one side of the housing body 15, and the plane where the bridge housing connecting plate 5 is located is perpendicular to the plane where the housing body 15 is located; a differential bearing seat 1 is provided on the side of the bridge housing connecting plate 5 far from the housing body 15, and the edge of the bridge housing connecting plate 5 is detachably connected to the bridge housing 19 through a plurality of bolts or stud bolts evenly distributed, so that the differential bearing seat 1 extends into the bridge housing 19. Among them, the housing body 15, the first ring cover 6, the second ring cover 9, the third ring cover 12, the fourth ring cover 11, the bridge housing connecting plate 5, and the differential bearing seat 1 are of an integral structure, reducing the number of parts and improving the sealing performance. Among them, both the second ring cover 9 and the third ring cover 12 are circular rings; the central axis of the second ring cover 9 and the central axis of the input shaft bearing through-hole 4 are located on the same straight line; the central axis of the third ring cover 12 and the central axis of the output shaft bearing through-hole 7 are located on the same straight line. In addition, lubrication holes are provided on both the housing body 15 and the bridge housing 19 for lubricating various parts of the transmission and the axle.

[0048] As Figure 4 and Figure 5 described above, Embodiment 2 of the present invention further provides another integrated transmission housing, which is symmetric with the integrated transmission housing structure provided in Embodiment 1 and has basically the same structure. The difference is that a differential bearing seat 1 is not provided on the side of the bridge housing connecting plate 5 far from the housing body 15, but the bridge housing connecting plate 5 is still detachably connected to the other side of the bridge housing 19 through a plurality of bolts or stud bolts evenly distributed on its edge.

[0049] Combined Figure 1 、 Figure 2 、 Figures 4 - 6 As shown, the embodiment of the present invention further provides a dual-motor electric drive axle assembly, which includes an integrated transmission housing of the above-mentioned Embodiment 1, an integrated transmission housing of the above-mentioned Embodiment 2, and an axle housing 19; the two integrated transmission housings are symmetrically arranged on both sides of the axle housing 19. In addition, lubrication holes are provided on both the housing body 15 and the axle housing 19 for lubricating various parts of the transmission and the axle.

[0050] As described above, the above is only the specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. An integrated transmission housing, characterized in that: It includes a housing body (15), a first ring cover (6), a second ring cover (9), a third ring cover (12), a fourth ring cover (11), and a bridge housing connecting plate (5); Input shaft bearing through holes (4), output shaft bearing through holes (7), and intermediate shaft bearing through holes (8) are distributed on the housing body (15); The first ring cover (6) is arranged on one side of the housing body (15) and surrounds the peripheries of the input shaft bearing through hole (4), the output shaft bearing through hole (7), and the intermediate shaft bearing through hole (8), and its end face is a rear cover joint surface; a shift operation window (3) is provided on the side wall of the first ring cover (6), and a shift fork shaft hole (2) is provided at the corresponding position on its inner wall; The second ring cover (9), the third ring cover (12), and the fourth ring cover (11) are all arranged on the other side of the housing body (15); The second ring cover (9) is arranged around the input shaft bearing through hole (4) for installing a motor, and a protrusion (10) for installing a motor heat exchanger (14) is provided on its outer wall; an oil inlet hole (16) for the motor heat exchanger (14) to inlet oil is provided on the protrusion (10); The third ring cover (12) is arranged around the output shaft bearing through hole (7) for installing an output shaft bearing, and its end face is a bearing cover joint surface; The fourth ring cover (11) is arranged close to the second ring cover (9) for installing an oil pump; an oil outlet hole (17) for the oil pump to outlet oil is provided between the fourth ring cover (11) and the second ring cover (9); The bridge housing connecting plate (5) is fixedly arranged on one side of the housing body (15), and the plane where it is located is perpendicular to the plane where the housing body (15) is located for connecting the bridge housing.

2. The integrated transmission housing according to claim 1, characterized in that: A differential bearing seat (1) is provided on the side of the bridge housing connecting plate (5) away from the housing body (15).

3. The integrated transmission housing according to claim 2, wherein: The housing body (15), the first ring cover (6), the second ring cover (9), the third ring cover (12), the fourth ring cover (11), the bridge housing connecting plate (5), and the differential bearing seat (1) are of an integral structure.

4. The integrated transmission housing according to claim 3, wherein: It further includes a motor end cover (13); The motor end cover (13) is covered on the end of the second ring cover (9) away from the housing body (15).

5. The integrated transmission housing according to claim 4, characterized in that: An oil passage (18) is provided on the motor end cover (13); both ends of the oil passage (18) are communicated with the oil inlet hole (16) and the oil outlet hole (17) respectively.

6. The integrated transmission housing according to claim 5, wherein: Both the second ring cover (9) and the third ring cover (12) are circular rings; The central axis of the second ring cover (9) and the central axis of the input shaft bearing through hole (4) are on the same straight line; The central axis of the third ring cover (12) and the central axis of the output shaft bearing through hole (7) are on the same straight line.

7. A single-motor electric drive axle assembly, characterized in that, It includes an integrated transmission housing as claimed in claim 1 and a bridge housing (19); The integrated transmission housing is located on one side of the bridge housing (19); The bridge housing connecting plate (5) is detachably connected to the bridge housing (19).

8. The single-motor electric drive axle assembly according to claim 7, characterized in that, Lubrication holes are provided on both the housing body (15) and the bridge housing (19).

9. A dual-motor electric drive axle assembly, characterized in that, It includes two integrated transmission housings as claimed in claim 1 and one bridge housing (19); The two integrated transmission housings are symmetrically arranged on both sides of the axle housing (19); Each of the axle housing connecting plates (5) is detachably connected to the axle housing (19).

10. The dual-motor electric drive axle assembly according to claim 9, wherein, Lubrication holes are provided on both the housing body (15) and the axle housing (19).

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