A double gear box electric drive axle integrated lubrication system

Abstract

The application discloses a double-gearbox electric drive axle integrated lubricating system, which comprises a rear gearbox shell, a front gearbox shell, an axle housing and a rear gearbox bearing cover; a rear gearbox is arranged in the rear gearbox shell; a front gearbox is arranged in the front gearbox shell; the rear gearbox bearing cover is arranged on the rear gearbox shell and is connected with an input oil hole and two output oil channels; the rear gearbox shell and the front gearbox shell are connected; the axle housing is arranged between the rear gearbox shell and the front gearbox shell; the rear gearbox shell and the front gearbox shell are connected through two oil holes of the axle housing; and the two oil holes are connected through oil channels. The double-gearbox electric drive axle integrated lubricating system not only reduces development cost, but also guarantees lubricating requirements of the double gearboxes, increases the service life of the gearboxes and enables the double-gearbox electric drive axle to maintain high-efficiency work.

Description

Technical Field

[0001] This invention relates to the field of dual gearbox lubrication, specifically to an integrated lubrication system for a dual gearbox electric drive axle. Background Technology

[0002] With the rapid development of new energy vehicles, electric drive axle technology is increasingly being used in new energy commercial vehicles. However, due to the complex operating conditions of commercial vehicles, the lubricating oil level at the bottom of the electric drive axle dual gearbox changes frequently. Furthermore, due to prolonged high-torque operation, the dual gearbox is subjected to heavy loads and generates a lot of heat. The lubrication effect of splash lubrication within the dual gearbox housing alone cannot meet the lubrication requirements between the dual gearbox and the bearings, nor can it meet the gearbox's heat dissipation requirements. Over time, this will seriously reduce the service life of the gearbox. Summary of the Invention

[0003] To address the problems existing in the prior art, this invention provides an integrated lubrication system for a dual-gearbox electric drive axle; it not only reduces development costs but also ensures the lubrication requirements of the dual gearbox, increases the service life of the gearbox, and enables the dual-gearbox electric drive axle to maintain high-efficiency operation.

[0004] This invention is achieved through the following technical solution: an integrated lubrication system for a dual-gearbox electric drive axle, comprising a rear gearbox housing, a front gearbox housing, an axle housing, and a rear gearbox bearing cover; a rear gearbox is disposed inside the rear gearbox housing, and a front gearbox is disposed inside the front gearbox housing; a rear gearbox bearing cover is disposed on the rear gearbox housing, and the rear gearbox bearing cover is connected to an oil inlet hole and two oil outlet passages; the rear gearbox housing and the front gearbox housing are connected; an axle housing is disposed between the rear gearbox housing and the front gearbox housing, and the rear gearbox housing and the front gearbox housing are connected through two oil holes in the axle housing, and the two oil holes are connected through oil passages.

[0005] Furthermore, the rear gearbox housing has a mounting position for an electronic oil pump.

[0006] Furthermore, the electronic oil pump is connected to the rear gearbox.

[0007] Furthermore, the rear gearbox housing is provided with a mounting position for the fine filter.

[0008] Furthermore, when a fine filter needs to be installed, the rear gearbox housing is provided with an oil passage connecting the electronic oil pump and the fine filter. The rear gearbox housing is also provided with an oil passage connecting the fine filter and the rear gearbox bearing cover. The fine filter is connected to the inlet oil hole of the rear gearbox bearing cover. When the fine filter does not need to be installed, the installation position of the fine filter is sealed by a cover.

[0009] Furthermore, the rear gearbox housing has a mounting position for a radiator.

[0010] Furthermore, when a radiator needs to be installed, the radiator is installed on the rear gearbox bearing cover, the inlet of the radiator is connected to the oil inlet hole of the rear gearbox bearing cover, and the outlet of the radiator is connected to the two oil outlet passages of the rear gearbox bearing cover; when a radiator is not required, the oil inlet hole of the rear gearbox bearing cover is connected to the two oil outlet passages of the rear gearbox bearing cover.

[0011] Furthermore, one of the oil outlet passages of the rear gearbox bearing cover is connected to the interior of the rear gearbox, and the other oil outlet passage of the rear gearbox bearing cover is connected to the oil passage connecting the front gearbox and the rear gearbox housing.

[0012] Furthermore, the radiator is externally connected to an outlet and an inlet.

[0013] Compared with the prior art, the present invention has the following beneficial technical effects:

[0014] This invention proposes an integrated lubrication system for a dual-gearbox electric drive axle. The two gearboxes at the front and rear of the axle housing share a single lubrication system, which not only meets the lubrication needs of both gearboxes but also reduces the development cost of the electric drive axle compared to having two separate lubrication systems, making it both economical and practical.

[0015] Furthermore, the lubrication system of this device is also equipped with an electronic oil pump, a fine filter, and a radiator. The fine filter and radiator are optional components, which can keep the lubricating oil in the gearbox in good quality and at a suitable operating temperature, greatly increasing the service life of the gearbox. Moreover, a lubrication system only requires one lubrication interface to be reserved in the whole vehicle, which facilitates the compact layout of the vehicle's pipelines and saves the overall layout space. Attached Figure Description

[0016] 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 these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the overall structure of an integrated lubrication system for a dual-gearbox electric drive bridge provided by the present invention;

[0018] Figure 2 A schematic diagram of the oil passage layout of an integrated lubrication system for a dual-gearbox electric drive bridge provided by the present invention;

[0019] Figure 3A schematic diagram of the radiator structure of an integrated lubrication system for a dual-gearbox electric drive bridge provided by the present invention;

[0020] In the diagram: 1. Rear gearbox housing; 2. Front gearbox housing; 3. Axle housing; 4. Radiator; 5. Electronic oil pump; 6. Rear gearbox bearing cover; 7. Fine filter. Detailed Implementation

[0021] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0022] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0023] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0024] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0025] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0026] Example 1:

[0027] This embodiment provides an integrated lubrication system for a dual-gearbox electric drive axle, including an electronic oil pump 5, a fine filter 7, a radiator 4, a front gearbox, a front gearbox housing 2 with internal oil passages, a front gearbox housing 1, a rear gearbox bearing cover 6, and an axle housing 3.

[0028] The fine filter 7 and radiator 4 are optional components and can be selected according to requirements. The rear gearbox housing 1 is provided with installation positions for the electronic oil pump 5, the fine filter 7 and the rear gearbox bearing cover 6; the rear gearbox housing 1 is provided with lubricating oil passages between the positions of the electronic oil pump 5 and the fine filter 7, as well as oil passages from the fine filter position to the oil inlet hole of the rear gearbox bearing cover 6, to ensure that the oil circuit remains smooth whether the fine filter is installed or not.

[0029] In actual use, if the fine filter 7 is selected, the electronic oil pump 5 and the fine filter 7 are installed on the rear gearbox housing 1; if the fine filter 7 is not selected, the position of the fine filter 7 on the rear gearbox housing 1 is sealed with a cover.

[0030] The rear gearbox bearing cover 6 is installed on the rear gearbox housing 1. The rear gearbox bearing cover 6 is provided with an oil inlet hole and two output branch oil passages. The oil passage at the fine filter position on the rear gearbox housing 1 leads to the oil inlet hole of the rear gearbox bearing cover 6.

[0031] In actual use, if radiator 4 is selected, radiator 4 is installed on the rear gearbox bearing cover 6. The oil inlet of the rear gearbox is connected to the oil inlet of radiator 4, and the oil outlet of radiator 4 is connected to the two output branch oil passages of the rear gearbox bearing cover 6. If radiator 4 is not selected, the oil inlet of the rear gearbox bearing cover 6 is directly connected to the two output branch oil passages of the rear gearbox bearing cover 6 inside the bearing cover.

[0032] The rear gearbox housing 1 and the front gearbox housing 2 are connected by a lubricating oil delivery channel. The axle housing 3 has two oil holes that cooperate with the oil delivery channels of the front and rear gearbox housings. The two axle housing holes are connected by an oil pipe.

[0033] The rear gearbox bearing cover 6 has two output oil channels. One output oil channel leads into the interior of the rear gearbox, through which lubricating oil is supplied to the gears, bearings, and other components of the rear gearbox that require lubrication. The other output oil channel connects to the oil supply channel from the rear gearbox housing 1 to the front gearbox. Lubricating oil passes through this channel, via the axle housing oil pipe and the front gearbox oil supply channel, and is supplied to the gears, bearings, and other components of the front gearbox that require lubrication.

[0034] The positions of the electronic oil pump 5 and the fine filter 7 can be adjusted according to the overall vehicle layout requirements. The oil passage between the electronic oil pump 5 and the fine filter 7 in the rear gearbox housing 1, all the way to the rear gearbox housing bearing cover 6, can also be adjusted according to the positions of the electronic oil pump 5 and the fine filter 7 to ensure smooth oil flow.

[0035] The positions of the input oil hole and the two output branch oil passages on the rear gearbox bearing cover 6 can also be adjusted according to the oil passage layout to ensure smooth oil flow.

[0036] The optional radiator 4 has two external interfaces: one inlet and one outlet. It achieves lubricant cooling by connecting to a circulating water circuit. The size and shape of the radiator 4 can be adjusted according to the cooling requirements of the gearbox to meet both cooling needs and overall vehicle layout space requirements.

[0037] This invention proposes an integrated lubrication system for a dual-gearbox electric drive axle. The lubrication system is centrally located on the rear gearbox, with both front and rear gearboxes sharing a single lubrication system. This not only saves costs but also simultaneously meets the lubrication needs of both gearboxes. The lubrication system provided by this invention consists of an electronic oil pump 5, a fine filter 7, and a radiator 4. The fine filter 7 and radiator 4 are optional components, ensuring that the lubricating oil in the gearbox maintains good quality and a suitable operating temperature, greatly increasing the service life of the gearbox. Moreover, only one lubrication interface needs to be reserved in the entire vehicle for the entire lubrication system, facilitating a compact layout of the vehicle's piping and saving overall vehicle space.

[0038] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0039] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that can be understood by those skilled in the art. The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. An integrated lubrication system for a dual-gearbox electric drive axle, characterized in that, The system includes a rear gearbox housing (1), a front gearbox housing (2), an axle housing (3), and a rear gearbox bearing cover (6). The rear gearbox housing (1) houses the rear gearbox, and the front gearbox housing (2) houses the front gearbox. The rear gearbox housing (1) is provided with a rear gearbox bearing cover (6), which connects an input oil hole and two output oil passages. The rear gearbox housing (1) and the front gearbox housing (2) are connected. An axle housing (3) is provided between the rear gearbox housing (1) and the front gearbox housing (2). The rear gearbox housing (1) and the front gearbox housing (2) are connected through two oil holes in the axle housing (3), which are connected through oil passages. The rear gearbox housing (1) has an installation position for an electronic oil pump (5); one of the output oil passages of the rear gearbox bearing cover (6) is connected to the interior of the rear gearbox, and the other output oil passage of the rear gearbox bearing cover (6) is connected to the oil passage connecting the front gearbox and the rear gearbox housing (1).

2. The integrated lubrication system for a dual-gearbox electric drive axle according to claim 1, characterized in that, The electronic oil pump (5) is connected to the rear gearbox.

3. The integrated lubrication system for a dual-gearbox electric drive axle according to claim 1, characterized in that, The installation position of the fine filter (7) is provided on the rear gearbox housing (1).

4. The integrated lubrication system for a dual-gearbox electric drive axle according to claim 1, characterized in that, When a fine filter (7) needs to be installed, an oil passage connecting the electronic oil pump (5) and the fine filter (7) is provided on the rear gearbox housing (1). An oil passage connecting the fine filter (7) and the rear gearbox bearing cover (6) is also provided on the rear gearbox housing (1). The fine filter (7) and the input oil hole of the rear gearbox bearing cover (6) are connected. When the fine filter (7) does not need to be installed, the installation position of the fine filter (7) is sealed by a cover.

5. The integrated lubrication system for a dual-gearbox electric drive axle according to claim 1, characterized in that, The rear gearbox housing (1) has a mounting position for the radiator (4).

6. The integrated lubrication system for a dual-gearbox electric drive axle according to claim 1, characterized in that, When a radiator (4) is required to be installed, the radiator (4) is installed on the rear gearbox bearing cover (6), the inlet of the radiator (4) is connected to the oil inlet of the rear gearbox bearing cover (6), and the outlet of the radiator (4) is connected to the two oil outlet passages of the rear gearbox bearing cover (6); when a radiator (4) is not required to be installed, the oil inlet of the rear gearbox bearing cover (6) is connected to the two oil outlet passages of the rear gearbox bearing cover (6).

7. The integrated lubrication system for a dual-gearbox electric drive axle according to claim 6, characterized in that, The radiator (4) has an external outlet and an external inlet.

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