Gear box, electric drive assembly system and vehicle

Abstract

The present disclosure relates to a gearbox (100) comprising: a housing (10); the gear set (20) is arranged in the shell (10), and the gear set (20) comprises one or more gears; the filter (30) is arranged in the shell (10), the filter (30) is provided with a main body part (31), a filter element is arranged in the main body part (31) and used for filtering a lubricating medium, the filter (30) is further provided with an isolation part (32), the filter (30) and the shell (10) form a lubricating medium containing space (S) through the isolation part (32), and the lubricating medium containing space (S) is used for containing the lubricating medium. The lubricating medium accommodating space (S) is substantially isolated from the gear set (20). The present disclosure also relates to an electric drive assembly system comprising the gearbox (100) and a motor vehicle comprising the electric drive assembly system.

Description

Technical Field

[0001] The present disclosure relates to the field of gearboxes, and more particularly to a gearbox having a lubricating medium containing space substantially isolated from gears. The present disclosure also relates to an electric drive assembly system and a vehicle comprising such a gearbox. Background Art

[0002] Typically, a gearbox is installed in a vehicle, and a series of transmission components are housed in the housing of the gearbox to transfer power from the power source to the wheels to drive the vehicle forward. The rotation of the gears in the gearbox will stir the lubricating medium at the bottom of the housing, causing the lubricating medium to splash in the gearbox. However, if the gears in the gearbox stir up too much lubricating medium, it will cause energy loss (i.e., stirring loss), reduce the output power of the gearbox, and reduce the transmission efficiency of the drive system. Due to the constraints of the overall design of the vehicle, it is sometimes necessary to place multiple gears at the bottom of the gearbox, so that multiple gears stir the lubricating medium at the same time, and one or more of the gears may have a large rotation speed. Such energy loss is therefore very significant, affecting the power transmission efficiency. In the case of an electrified vehicle, this energy loss will also lead to a reduction in the cruising range of the electrified vehicle.

[0003] In addition, during the operation of the gearbox, the lubricating medium contacts with multiple components in the gearbox, including the gears, to cool and / or lubricate them. Impurities such as metal chips that may be generated during the operation of these components are also carried away by the lubricating medium. The accumulation of these impurities in the lubricating medium may cause wear of various components of the gearbox, thereby reducing the life of the gearbox.

[0004] Therefore, there is an urgent need for a gear box that can isolate the gears from the collected lubricating medium and remove impurities in the lubricating medium, so as to improve the transmission efficiency and service life of the gear box. Summary of the invention

[0005] The purpose of the present disclosure is to provide a gearbox to solve the above technical problems, which is designed so that the lubricating medium deposited at the bottom of the gearbox is substantially isolated from the gears, thereby reducing the oil churning loss of the gearbox.

[0006] The gearbox according to the present disclosure comprises: a housing; a gear set arranged in the housing, the gear set comprising one or more gears; and a filter arranged in the housing, the filter having a main body, a filter element arranged in the main body, and used to filter the lubricating medium. The filter also has an isolating portion, the filter forms a lubricating medium accommodating space with the housing through the isolating portion, and the lubricating medium accommodating space is substantially isolated from the gear set.

[0007] In the present disclosure, the filter can remove impurities accumulated in the lubricating medium during the operation of the motor vehicle, thereby increasing the service life of the gearbox. The housing of the gearbox and the isolating portion of the filter cooperate to form a lubricating medium accommodating space, which is roughly isolated from the gear set of the gearbox. Therefore, the lubricating medium collected in the lubricating medium accommodating space will not be stirred by the gears in the gear set, thereby reducing the oil stirring loss and improving the power transmission efficiency of the gearbox. In addition, by integrating the isolating portion on the filter, there is no need to provide a dedicated part for forming the lubricating medium accommodating space in the gearbox, thereby improving the integration of the gearbox.

[0008] The gearbox according to the present disclosure may also have one or more of the following features alone or in combination.

[0009] According to one embodiment of the present disclosure, the gear set includes a first gear, the first gear is close to the lower edge of the housing, and the isolation portion has a profile along the circumference of the first gear. Under the action of gravity, the lubricating medium is collected at the bottom of the gear box. Therefore, the first gear close to the lower edge of the housing is the gear in the gear set that is easy to contact with the lubricating medium. By making the isolation portion have a profile along the circumference of the first gear, the isolation effect on the first gear is increased, and the churning loss can be further reduced.

[0010] According to an embodiment of the present disclosure, the partition portion is a side extension portion extending from one side of the main body portion of the filter in the axial direction.

[0011] According to one embodiment of the present disclosure, the main body of the filter and the first gear are offset from each other in the axial direction, at least a portion of the lubricating medium accommodating space overlaps with the first gear in the axial direction, and at least a portion of the lubricating medium accommodating space is isolated from the first gear by the side extension portion.

[0012] According to the above features, the main body of the filter and the first gear have different axial positions, while the lubricating medium accommodating space and the first gear have approximately the same axial position and are isolated from each other by the side extension of the filter in a direction perpendicular to the axial direction.

[0013] According to an embodiment of the present disclosure, the isolation portion is an extension portion located above the main body portion of the filter.

[0014] According to one embodiment of the present disclosure, at least a portion of the main body of the filter and at least a portion of the lubricating medium accommodating space overlap with the first gear in the axial direction, and at least a portion of the lubricating medium accommodating space is isolated from the first gear by the extending portion.

[0015] According to the above features, the first gear partially overlaps with the main body of the filter and the lubricating medium accommodating space in the axial direction. For example, the lubricating medium accommodating space may be partially located below the first gear in the vertical direction (the axial direction is perpendicular to the vertical direction).

[0016] According to one embodiment of the present disclosure, the shell has a protrusion, which forms a receiving cavity for receiving the main body.

[0017] According to an embodiment of the present disclosure, the housing has an isolation plate, and the isolation plate has a profile that matches the isolation portion, and the two cooperate with each other to define the lubricating medium accommodating space.

[0018] According to an embodiment of the present disclosure, the main body of the filter has an inlet connected to the lubricating medium accommodating space. The lubricating medium can enter the filter through the oil inlet and be filtered by the filter element of the filter.

[0019] According to one embodiment of the present disclosure, the upper edge of the isolation portion is spaced apart from the housing at a predetermined distance, thereby forming a channel for the lubricating medium to flow into the lubricating medium accommodating space. The lubricating medium that is carried up and splashed by the gears in the gear set will return to the lubricating medium accommodating space through the channel, avoiding the risk of the lubricating medium gathering outside the lubricating medium accommodating space and being stirred by the gears.

[0020] According to an embodiment of the present disclosure, the main body of the filter includes one or more mounting holes, and the filter is fixed to the housing by screws passing through the mounting holes.

[0021] According to one embodiment of the present disclosure, the housing includes a first half shell and a second half shell assembled together.

[0022] According to one embodiment of the present disclosure, the first gear of the gear set is a differential gear.

[0023] The present disclosure also relates to an electric drive assembly system, which includes the above-mentioned gearbox.

[0024] The present disclosure also relates to a motor vehicle, which includes the above-mentioned electric drive assembly system. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can also be obtained based on these drawings without creative work. The following drawings are not deliberately scaled according to the actual size, and the focus is on illustrating the main purpose of the present disclosure.

[0026] Figure 1 An electric drive assembly system according to the present disclosure is shown;

[0027] Figure 2 A gearbox is shown with the second half of the housing omitted;

[0028] Figure 3 A gearbox is shown with the first half of the housing omitted;

[0029] Figure 4 A filter according to one embodiment of the present disclosure is shown, which includes a partition formed by a side extension;

[0030] Figure 5 is a cross-sectional view of a gearbox according to one embodiment of the present disclosure;

[0031] Figure 6 and Figure 7 A first half shell and a second half shell of a housing of a gearbox are shown respectively.

[0032] Throughout the drawings, the same or similar components are indicated by the same reference numerals. DETAILED DESCRIPTION

[0033] In order to make the objectives, technical solutions and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure.

[0034] Unless otherwise defined, the technical terms or scientific terms used herein shall have the usual meanings understood by ordinary technicians in the field to which the present disclosure belongs. The words "one", "an" or "the" and the like used in the patent application specification and claims of the present disclosure do not indicate a quantity limitation, but indicate the existence of at least one. The words "include" or "include" and the like mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. The words "first", "second" and the like used in the patent application specification and claims of the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly. The terms "axial" and "axial direction" refer to the direction of the rotation axis X of the first gear.

[0035] Various embodiments according to the present disclosure will be described in detail with reference to the accompanying drawings. Here, it should be noted that in the accompanying drawings, the same reference numerals are given to components having substantially the same or similar structures and functions, and repeated descriptions thereof will be omitted.

[0036] Figure 1-3 An external perspective view of the electric drive assembly system 1 including the gearbox 100 and a perspective view of internal components of the gearbox 100 are shown.

[0037] As shown in the figure, the gearbox 100 includes a housing 10 formed by assembling a first half shell 11 and a second half shell 12, a gear set 20 arranged in the housing 10 as a transmission component and including one or more gears, and a filter 30 forming a lubricating medium accommodating space S with the housing 10. In particular, Figure 1 In the illustrated embodiment, other components of the electric drive assembly system 1 , such as a motor, etc., may also be arranged in the housing 10 .

[0038] The gear set 20 includes a first gear 21, which is arranged close to the lower edge of the housing 10. Figure 2 In the illustrated embodiment, the first gear 21 has a relatively large diameter and is a differential gear. The gear set 20 may further include other gears located above the first gear 21 and connected to the first gear 21, such as a gear connected to the output shaft of the motor of the electric drive assembly system 1 and an intermediate gear connected between the gear and the first gear 21.

[0039] During operation, the transmission components of the gearbox 100 are lubricated and / or cooled by the lubricating medium. Afterwards, the lubricating medium gathers at the bottom of the housing 10, occupies a certain volume, and forms a liquid surface of the lubricating medium. Then, the lubricating medium can circulate under the action of flow components such as the fluid pump 40, and flow through the transmission components of the gearbox 100 again for lubrication and / or cooling. In addition, the lubricating medium can also circulate through other components of the electric drive assembly system 1, such as the stator and rotor of the motor, to lubricate and cool them. Impurities such as metal chips that may be generated during the operation of these components are also carried away by the lubricating medium. Therefore, it is necessary to filter the lubricating medium to prevent the accumulation of impurities in the lubricating medium, which may reduce the life of the gearbox.

[0040] Since the first gear 21 is arranged at the lower part of the housing 10 , the lower edge thereof is close to the bottom of the housing 10 . The liquid level of the lubricating medium will submerge a part of the lower half of the first gear 21 .

[0041] The filter 30 disposed in the housing 10 of the gearbox 100 may isolate the lubricating medium from the first gear 21. Figure 4 and Figure 5The filter 30 includes a main body 31 and a partition 32. The partition 32 of the filter 30 and the housing 10 form a lubricating medium accommodating space S that is substantially isolated from the first gear 21. At least a portion of the lubricating medium collected at the lower portion of the housing 10 is accommodated in the lubricating medium accommodating space S, so as not to contact the first gear 21, that is, the first gear 21 is isolated from the lubricating medium collected at the bottom of the housing 1, thereby reducing the churning loss.

[0042] exist Figure 4 and Figure 5 In the illustrated embodiment, the isolation portion 32 is a side extension portion 32a extending substantially in the axial direction from one side of the main body portion 31 and has a substantially arc-shaped profile along the periphery of the first gear 21. Figure 5 and Figure 7 As shown, the housing 10 is further provided with an isolation plate 15 on the second half shell 12, and the contour of the isolation plate 15 matches the isolation portion 32. The lubricating medium accommodating space S is defined by the isolation plate 15 and the isolation portion 32 in cooperation with each other.

[0043] like Figures 5 to 7 As shown, the main body 31 of the filter 30 and the first gear 21 are staggered from each other in the axial direction, and are accommodated in the accommodation cavity 14 defined by the protrusion 13 on the first half shell 11. The side extension 32a and the isolation plate 15 overlap with the first gear 21 in the axial direction. A part of the lubricating medium accommodating space S defined by the isolation plate 15 and the isolation portion 32 overlaps with the first gear 21 in the axial direction, and is isolated from the first gear 21 by the isolation plate 15 and the isolation portion 32. The upper edge 34 of the isolation portion 32 is spaced apart from the housing 10 by a predetermined distance, forming a channel for the lubricating medium to flow into the lubricating medium accommodating space S. Specifically, when the gear box 100 is working, the lubricating medium enters the gear box 100 through the lubricating medium introduction device (not shown), and lubricates and / or cools the gear set 20 including the first gear 21. In particular, the lubricating medium reaching the first gear 21 will splash out from the first gear 21 when the first gear 21 rotates. Due to the rotation direction of the first gear 21 and the axial position coinciding with the lubricating medium accommodating space S, a large part of the lubricating medium splashed from the first gear 21 can fall on the housing 10 and flow into the lubricating medium accommodating space S through the channel or directly fall into the lubricating medium accommodating space S from above through the channel.

[0044] The filter 30 can also filter the lubricating medium to prevent the accumulation of impurities in the lubricating medium. Specifically, a filter element is arranged in the main body 31 of the filter 30. The accommodating cavity 14 accommodating the main body 31 is connected to the lubricating medium accommodating space S, and the oil inlet 33 of the main body 31 is connected to the lubricating medium accommodating space S. Figure 3As shown, the oil inlet 33 is located at the bottom of the main body 31, and the fluid pump 40 is connected to the filter 30 at the side of the main body 33. Under the action of the fluid pump 40, the lubricating medium contained in the lubricating medium accommodating space S is sucked into the main body 31 of the filter 30 from the oil inlet 33 and filtered by the filter element, leaving the impurities in the lubricating medium in the filter.

[0045] As described above, the filter 30 integrates the filtering function and the function of reducing the oil stirring loss of the gearbox 100 , thereby improving the integration degree of the gearbox 100 .

[0046] The protrusion 13 forming the accommodating cavity 14 for accommodating the main body 31 is located on one side of the first gear 21 as a whole, and does not increase the overall height of the gear box 100. Figure 1 and Figure 3 , the protrusion 13 is on the same side as the fluid pump 40 and the motor of the electric drive assembly system 1. These areas are parts of the housing 10 of the gearbox 100 with a relatively large thickness, and the thickness of the protrusion 13 is within the contour of these areas, which does not increase the overall thickness of the gearbox 100.

[0047] In addition, reference Figure 4 In order to fix the filter 30 to the housing 10 , the main body 31 is further provided with two mounting holes 35 . The filter 30 is fixed to the housing 10 by screws passing through the mounting holes 35 .

[0048] The gearbox 100 according to the present disclosure is described above in conjunction with the accompanying drawings. It should be understood that the gearbox 100 and its components may also have other structures to achieve their functions. For example, the housing 10 may not be provided with a partition plate, and the lubricating medium accommodating space S is completely separated from the first gear 21 by the partition 32. There may be a plurality of gears in the gear set 20 close to the lower edge of the housing, and the lubricating medium accommodating space S formed by the partition 30 and the housing 10 may be substantially isolated from all of these gears. In addition, the partition 32 may be formed by an extension located above the main body 31 of the filter 30. At this time, at least a portion of the main body 31 and at least a portion of the lubricating medium accommodating space S overlap with the first gear 21 in the axial direction and are isolated from the first gear 21 by the extension. That is, the main body 31 and the partition 32 may be located below the first gear 21 as a whole.

[0049] According to another aspect of the present disclosure, a vehicle is provided, which includes the electric drive assembly system as described above. The vehicle may be an electrified vehicle, such as a battery electric vehicle (BEV), a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHEV), an extended range electric vehicle (Range extended EV), or a fuel cell vehicle (FCEV). The vehicle may also be a hydrogen energy vehicle.

[0050] Certain features, structures or characteristics in one or more embodiments of the present disclosure may be appropriately combined.

[0051] The above is an explanation of the present disclosure and should not be considered as a limitation thereof. Although several exemplary embodiments of the present disclosure are described, it will be readily appreciated by those skilled in the art that many modifications may be made to the exemplary embodiments without departing from the novel teachings and advantages of the present disclosure. Therefore, all such modifications are intended to be included within the scope of the present disclosure as defined in the claims. It should be understood that the above is an explanation of the present disclosure and the present disclosure should not be considered to be limited to the specific embodiments disclosed, and modifications to the disclosed embodiments and other embodiments are intended to be included within the scope of the present disclosure.

Claims

1. A gearbox (100), characterized in that: The gear box (100) comprises: Housing (10); a gear set (20) disposed in the housing (10), the gear set (20) comprising one or more gears; and A filter (30) is arranged in the housing (10), the filter (30) having a main body (31), a filter element arranged in the main body (31), and is used to filter the lubricating medium. The filter (30) further comprises an isolating portion (32), and the filter (30) forms a lubricating medium accommodating space (S) with the housing (10) through the isolating portion (32), and the lubricating medium accommodating space (S) is substantially isolated from the gear set (20).

2. The gearbox (100) according to claim 1, wherein: The gear set (20) includes a first gear (21) which is close to the lower edge of the housing (10), and the isolation portion (32) has a profile along the periphery of the first gear (21).

3. The gearbox (100) according to claim 2, wherein: The partition portion (32) includes a side extension portion (32a) extending from one side of the main body portion (31) of the filter (30) in a substantially axial direction.

4. The gearbox (100) according to claim 3, wherein: The main body (31) of the filter (30) and the first gear (21) are offset from each other in the axial direction, at least a portion of the lubricating medium accommodating space (S) and the first gear (21) are overlapped in the axial direction, and at least a portion of the lubricating medium accommodating space (S) is isolated from the first gear (21) by the side extension portion (32a).

5. The gearbox (100) according to claim 2, wherein: The isolation portion (32) includes an extension portion located above the main body portion (31) of the filter (30).

6. The gearbox (100) according to claim 5, wherein: At least a portion of the main body (31) of the filter (30) and at least a portion of the lubricating medium accommodating space (S) overlap with the first gear (21) in the axial direction, and at least a portion of the lubricating medium accommodating space (S) is isolated from the first gear (21) by the extension portion.

7. The gearbox (100) according to any one of claims 1 to 6, wherein: The housing (10) has a protruding portion (13), and the protruding portion (13) forms a receiving cavity (14) for receiving the main body (31).

8. The gearbox (100) according to any one of claims 1 to 6, wherein: The housing (10) has an isolation plate (15), and the isolation plate (15) has a profile that matches the isolation portion (32), and the two cooperate with each other to define the lubricating medium accommodating space (S).

9. The gearbox (100) according to any one of claims 1 to 6, wherein: The main body (31) of the filter (30) has an inlet (33) connected to the lubricating medium accommodating space (S).

10. The gearbox (100) according to any one of claims 1 to 6, wherein: An upper edge (34) of the partition (32) is spaced apart from the housing (10) by a predetermined distance, thereby forming a channel for the lubricating medium to flow into the lubricating medium accommodating space (S).

11. The gearbox (100) according to any one of claims 1 to 6, wherein: The main body (31) of the filter (30) includes one or more mounting holes (35), and the filter (30) is fixed to the housing (10) by screws passing through the mounting holes (35).

12. The gearbox (100) according to any one of claims 1 to 6, wherein: The housing (10) comprises a first half shell (11) and a second half shell (12) which are assembled together.

13. The gearbox (100) according to any one of claims 2 to 6, wherein: The first gear (21) of the gear set (20) is a differential gear.

14. An electric drive assembly system (1), characterized in that: The electric drive assembly system comprises a gearbox (100) according to any one of claims 1 to 13.

15. A vehicle, characterized in that: The motor vehicle includes the electric drive assembly system according to claim 14.

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