Gearbox, electric drive assembly system and vehicle
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- VALEO EAUTOMOTIVE GERMANY GMBH
- Filing Date
- 2023-08-15
- Publication Date
- 2026-07-29
AI Technical Summary
Existing gearboxes in vehicles experience significant oil agitation losses due to lubricating oil being stirred by gears, leading to reduced power transmission efficiency and cruising range in electric vehicles.
A gearbox design that isolates lubricating oil from gears using an oil isolation plate and housing configuration, forming a separate lubricating oil holding space to minimize agitation.
Reduces oil agitation losses, improving power transmission efficiency and maintaining vehicle performance.
Smart Images
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Abstract
Description
[Technical field]
[0001] The present disclosure relates to the field of gearboxes, and in particular to a gearbox having a lubricating oil retaining space substantially isolated from the gears. Further, the present disclosure relates to an electric drive assembly system and a vehicle including such a gearbox. [Background technology]
[0002] A gearbox is generally installed in a vehicle. A series of transmission parts are housed in the housing of the gearbox, and the vehicle is driven forward by transmitting power from a power source to the wheels. When the gearbox is installed in a predetermined position in the vehicle, the lubricating oil in the casing of the gearbox for lubricating the transmission parts is collected at the bottom of the casing. The rotation of the gears in the gearbox stirs the lubricating oil at the bottom of the casing. As a result, the lubricating oil is scattered in the gearbox and collected again at the bottom of the casing, forming a dynamic equilibrium. However, if the gears in the gearbox stir the lubricating oil too much, energy loss (i.e., oil stirring loss) occurs, which reduces the output of the gearbox and reduces the transmission efficiency of the drive system. Due to the design constraints of the entire vehicle, it may be necessary to place multiple gears at the bottom of the gearbox, resulting in multiple gears stirring the lubricating oil at the same time. Furthermore, one or more of these gears may have a high rotation speed, so the oil stirring loss becomes very significant and affects the power transmission efficiency. If the vehicle is an electric vehicle, such oil churning losses may also result in a reduction in the range of the electric vehicle. Summary of the Invention
[0003] The objective of the present disclosure is to propose a gearbox that solves the above mentioned technical problems, the gearbox being designed in such a way that the lubricating oil accumulated at the bottom of the gearbox is substantially isolated from the gears, thereby reducing the oil churning losses in the gearbox.
[0004] A gearbox according to the present disclosure comprises a housing, a first shaft accommodated in the housing and having a first large gear, the first shaft rotating about a first rotation axis substantially parallel to an axial direction of the gearbox, a second shaft accommodated in the housing and having a second large gear, the second shaft rotating about a second rotation axis substantially parallel to the axial direction of the gearbox, and an oil isolation plate forming, together with the housing, a lubricating oil retaining space substantially isolated from the first large gear and the second large gear.
[0005] In the present disclosure, the gearbox housing and the oil isolation plate cooperate to define a lubricating oil retention space that is substantially isolated from the gears of the shaft within the gearbox, so that the lubricating oil collected in the lubricating oil retention space is not churned by the gears of the shaft, thereby improving power transmission efficiency while reducing oil churning loss.
[0006] A gearbox according to the present disclosure may also have one or more of the following features, either individually or in combination:
[0007] According to an embodiment of the disclosure, the gearbox further comprises a third shaft housed in the housing and having a first small gear, the third shaft rotating about a third axis of rotation substantially parallel to the axial direction of the gearbox. The first shaft further comprises a second small gear, the second small gear rotationally fixed to the first large gear and offset in the axial direction relative thereto, the first small gear meshing with the first large gear and the second small gear meshing with the second large gear. The center of the first shaft is disposed at a height below a line connecting the centers of the second shaft and the third shaft.
[0008] According to the above-mentioned features, the third shaft and the second shaft of the gearbox are separately connected to the first shaft by gear meshing. The third shaft and the second shaft can function as input shafts or output shafts of the gearbox. The first shaft can function as an intermediate shaft of the gearbox. When the third shaft functions as an input shaft, the first small gear of the third shaft meshes with the first large gear of the first shaft, and the rotation speed of the first shaft is reduced compared to the third shaft, and the second small gear of the first shaft meshes with the second large gear of the second shaft, and the rotation speed of the second shaft, which functions as an output shaft, is reduced compared to the first shaft. That is, the gearbox is used as a gear reducer. When the second shaft functions as an input shaft, the second large gear of the second shaft meshes with the second small gear of the first shaft, and the rotation speed of the first shaft is increased compared to the second shaft, and the first large gear of the first shaft meshes with the first small gear of the third shaft, and the rotation speed of the third shaft, which functions as an output shaft, is increased compared to the first shaft. That is, the gearbox is used as a gear step-up device.
[0009] According to an embodiment of the disclosure, the oil isolation plate has a body plate and a side extension, the body plate being substantially perpendicular to the axial direction of the gearbox, the body plate isolating the lubricating oil retention space from the first large gear, and the side extension extending perpendicularly from a side of the body plate adjacent to the second large gear and isolating the lubricating oil retention space from the second large gear.
[0010] According to the above features, the body plate and the side extensions of the oil isolation plate respectively isolate the first large gear of the first shaft and the second large gear of the second shaft from the lubricating oil retention space.
[0011] According to an embodiment of the present disclosure, the oil isolation plate further includes a bottom extension extending perpendicularly from the bottom of the body plate and interposed between the first large gear and the housing, the bottom extension having a contour that follows the circumference of the first large gear.
[0012] Regardless of whether the gearbox is used as a speed increaser or a speed reducer, the rotation speed of the first shaft, acting as an intermediate shaft, increases by one step compared to the second shaft. If the gear of the first shaft should come into contact with the lubricating oil collected at the bottom of the gearbox, the resulting oil churning loss may become more significant. Therefore, the bottom extension of the oil isolation plate provides better isolation of the first large gear of the first shaft, thereby minimizing the oil churning loss.
[0013] According to an embodiment of the present disclosure, the side extension has a contour that follows the circumference of the second large gear, i.e., the side extension has an arcuate contour that isolates the second large gear of the second shaft from the lubricating oil retaining space.
[0014] According to an embodiment of the present disclosure, the upper edge of the body plate is located above the lowest point of the circumference of the second small gear and below the position where the second small gear meshes with the second large gear.
[0015] According to an embodiment of the present disclosure, the upper edge of the body plate has a recess having a contour that follows the circumference of the second small gear.
[0016] The lubricating oil collected at the bottom of the housing occupies a certain volume and forms a lubricating oil level. The above-mentioned structure allows the upper edge of the body plate to be above the lubricating oil level, thus ensuring that the lubricating oil does not overflow from the lubricating oil holding space.
[0017] According to an embodiment of the present disclosure, the first large gear of the first shaft and the lubricating oil retention space are offset relative to each other in the axial direction and are isolated from each other by the body plate of the oil isolation plate, and the second large gear of the second shaft and the lubricating oil retention space are substantially coincident with each other in the axial direction and are isolated from each other by the side extension of the oil isolation plate.
[0018] According to the above-mentioned features, the first large gear of the first shaft and the lubricating oil holding space are axially isolated from each other by the main plate of the oil isolating plate, while the second large gear of the second shaft and the lubricating oil holding space have the same axial position and are isolated from each other in a direction perpendicular to the axial direction by the side extension of the oil isolating plate.
[0019] According to an embodiment of the present disclosure, the housing comprises a first half housing and a second half housing that are integrally fitted together, the first half housing being adjacent to the first large gear in the axial direction, and the second half housing being adjacent to the second large gear in the axial direction.
[0020] According to an embodiment of the present disclosure, the first half housing has an inclined portion disposed adjacent to the first large gear, the inclined portion inclining downward toward the lubricating oil holding space. When the oil isolation plate has a bottom extension, the bottom extension cooperates with the inclined portion to form an oil guide groove leading to the lubricating oil holding space. When the oil isolation plate does not have a bottom extension, the oil isolation plate may include a protrusion protruding perpendicularly from the body plate. The protrusion cooperates with the inclined portion to form an oil guide groove leading to the lubricating oil holding space. The lubricating oil may flow into the lubricating oil holding space via the oil guide groove.
[0021] According to an embodiment of the present disclosure, when the gearbox moves in the forward direction, at least a portion of the lubricating oil splashed from the first large gear of the first shaft falls into the first half housing and is guided to the lubricating oil retaining space by the oil guide groove. When the gearbox moves in the forward direction, at least a portion of the lubricating oil splashed from the second large gear of the second shaft falls into the lubricating oil retaining space.
[0022] The forward movement of the gearbox corresponds to the forward movement of the vehicle, and constitutes the majority of the operating states of the gearbox. According to the above-mentioned feature, the lubricating oil carried upward and splashed by the first large gear of the first shaft and the second large gear of the second shaft returns to the lubricating oil retention space, thereby preventing the lubricating oil from collecting outside the lubricating oil retention space and being stirred by the first large gear and the second large gear.
[0023] According to an embodiment of the present disclosure, the second half housing further includes a filter mounting hole for mounting a filter, and the oil isolation plate further includes a block portion protruding parallel to the main plate from the axial edge of the side extension portion, the block portion covering a portion of the filter mounting hole to substantially isolate the filter mounting hole from the second large gear.
[0024] The filter can filter the lubricating oil flowing through it. The lubricating oil in the lubricating oil holding space is sucked from the gearbox through the filter and returns to the gearbox after performing operations such as cooling. Therefore, the lubricating oil in the lubricating oil holding space flows toward the filter mounting hole. The blocking portion of the oil isolating plate can prevent the lubricating oil flowing toward the filter mounting hole from overflowing from the lubricating oil holding space.
[0025] According to an embodiment of the present disclosure, the body plate of the oil isolation plate is provided with two mounting holes, and the oil isolation plate is fixed to the first half housing by screws passing through the mounting holes.
[0026] The present disclosure further relates to an electric drive assembly system comprising the above-mentioned gearbox.
[0027] The present disclosure further relates to a vehicle including the electric drive assembly system described above.
[0028] In order to more clearly describe the technical solutions of the embodiments of the present disclosure, the drawings that need to be used in describing the embodiments are briefly described below. Of course, the drawings in the following description are only some embodiments of the present disclosure, and those skilled in the art may obtain other drawings based on these drawings without expending inventive efforts. The following drawings are not drawn in strict scale or enlargement to actual dimensions, but are focused on showing the gist of the present disclosure. [Brief description of the drawings]
[0029] [Figure 1] FIG. 1 is a perspective view of a gearbox according to an embodiment of the present disclosure. [Diagram 2] FIG. 2 shows the gearbox with the second housing half removed. [Diagram 3] FIG. 3 shows a top view of the three shafts of the gearbox. [Figure 4] Figure 4 shows the gearbox with the housing removed from a different angle. [Diagram 5] Figure 5 shows the gearbox with the housing removed from a different angle. [Figure 6] FIG. 6 illustrates a perspective view of an oil isolation plate according to an embodiment of the present disclosure. [Figure 7A] FIG. 7A shows the oil guide groove of the gearbox. [Figure 7B] FIG. 7B shows the oil guide groove of the gearbox. [Figure 8] FIG. 8 illustrates a perspective view of an oil isolation plate according to another embodiment of the present disclosure. [Figure 9A]FIG. 9A shows the filter mounting hole located in the second half of the housing and the blocking portion of the oil isolation plate. [Figure 9B] FIG. 9B shows the filter mounting hole located in the second housing half and the blocking portion of the oil separator plate. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0030] In all drawings, the same or similar components are labeled with the same numerals.
[0031] In order to clarify the technical solution objectives, technical solutions and advantages of the present disclosure, the technical solutions of the embodiments of the present disclosure are described below clearly and completely in conjunction with the drawings accompanying certain embodiments of the present disclosure.
[0032] Unless otherwise defined, technical or scientific terms used herein shall have the common meaning understood by those skilled in the art. The terms "a" or "the" and similar terms used in the specification and claims of the patent application of the present disclosure do not indicate a quantity limit, but rather mean that there is at least one. Terms such as "comprise", "include" or "have" mean that the element or object preceding the term covers the elements or objects listed thereafter and their equivalents, without excluding other elements or objects. The terms "first", "second" and similar terms used in the specification and claims of the patent application of the present disclosure are merely used to distinguish different components, and do not indicate any order, quantity or importance. The terms "upper", "lower", "left", "right" and the like are used only to indicate a relative positional relationship, and if the absolute position of the described object is changed, the relative positional relationship may change accordingly.
[0033] The embodiments according to the present disclosure will be described in detail with reference to the drawings. It should be noted that in the drawings, components having substantially the same or similar structures and functions are assigned the same reference numerals, and repeated descriptions of such components are omitted.
[0034] 1 to 3 are perspective views of the exterior of a gearbox 100, as well as perspective and top views of its internal components.
[0035] As shown in the figure, the gearbox 100 comprises a housing 10 formed by integrally fitting a first half housing 11 and a second half housing 12, a first shaft 20, a second shaft 30 and a third shaft 40 arranged in the housing 10 as transmission components, and an oil isolation plate 50 which, together with the housing 10, forms a lubricating oil retention space S.
[0036] The first shaft 20 rotates about a first rotation axis X1 and has a first large gear 21 and a second small gear 22. The second shaft 30 rotates about a second rotation axis X2 and has a second large gear 31. The third shaft 40 rotates about a rotation axis X3 and has a first small gear 41. The three rotation axes X1, X2, and X3 are substantially parallel to each other and to the axial direction of the gearbox 100.
[0037] The first large gear 21 and the second small gear 22 of the first shaft 20 are rotationally fixed and offset in the axial direction of the gearbox 100. The second large gear 31 of the second shaft 30 meshes with the second small gear 22 of the first shaft 20, and the axial positions of the two gears are substantially aligned. The first small gear 41 of the third shaft 40 meshes with the first large gear 21 of the first shaft 20, and the axial positions of the two gears are substantially aligned. The first large gear 21 is adjacent to the first half housing 11 in the axial direction, and the second large gear 31 is adjacent to the second half housing 12 in the axial direction.
[0038] In the power transmission path, depending on the purpose, the second shaft 30 and the third shaft 40 can each function as an input shaft or an output shaft of the gearbox 100. The first shaft 20 is disposed between the second shaft 30 and the third shaft 40 and always functions as an intermediate shaft of the gearbox 100. Due to the relationship in terms of the number of teeth between the meshed gears, the third shaft 40 has the highest rotational speed of the three shafts of the gearbox 100 and the second shaft 30 has the lowest rotational speed. The rotational speed of the first shaft 20 is between the rotational speeds of the second shaft and the third shaft.
[0039] The relative vertical positions of the shafts in the gearbox 100 are constrained by the overall design of the vehicle. In the embodiment shown in FIG. 4, the center of the third shaft 40 and the center of the second shaft 30 are located above the first shaft 20. In particular, the center of the first shaft 20 is located at a height below a line connecting the centers of the second shaft 30 and the third shaft 40. With reference to FIGS. 3 and 5, the radius of the first large gear 21 of the first shaft 20 is significantly smaller than the radius of the second large gear 31 of the second shaft 30, but the lowest part of the circumferential contour of the first large gear 21 is at the same height or lower than the lowest part of the circumferential contour of the second large gear 31.
[0040] During operation, the transmission components of the gearbox 100 are lubricated and / or cooled by the lubricating oil. The lubricating oil collects at the bottom of the housing 10, occupying a certain volume and forming a lubricating oil level. Since both the first large gear 21 and the second large gear 31 are located in the lower part of the housing 10, the lubricating oil level submerges a part of the lower half of both the first large gear 21 and the second large gear 31. Therefore, in the operating state, the first large gear 21 and the second large gear 31 rotate and stir the lubricating oil collected at the bottom of the housing 10. This stirring causes the power of the gearbox 100 to be dissipated in the lubricating oil, resulting in energy loss (i.e., stirring loss). This reduces the power transmission efficiency of the gearbox 100. The accumulation of oil stirring loss caused by the first large gear 21 and the second large gear 31 significantly reduces the power transmission efficiency of the gearbox 100.
[0041] In order to reduce such oil churning loss, the gearbox 100 further includes an oil isolation plate 50. The oil isolation plate 50, together with the housing 10, forms a lubricating oil holding space S that is substantially isolated from the first large gear 21 and the second large gear 31. With reference to FIGS. 4 to 6, the oil isolation plate 50 includes a main body plate 51 and a side extension portion 52. The main body plate 51 is substantially perpendicular to the axial direction of the gearbox 100. The side extension portion 52 extends perpendicularly from the side of the main body plate 51 that is close to the second large gear 31. As shown in FIG. 5, the main body plate 51 is disposed between the first large gear 21 of the first shaft 20 and the lubricating oil holding space S in the axial direction. The side extension portion 52 is disposed between the second large gear 31 of the second shaft 30 and the lubricating oil holding space S in the direction perpendicular to the axial direction. The side extension portion 52 has a contour that follows the circumference of the second large gear 31. That is, the first large gear 21 and the lubricating oil retention space S are offset from each other in the axial direction and are separated from each other by the main plate 51 of the oil isolation plate 50. The second large gear 31 and the lubricating oil retention space S are substantially aligned in the axial direction and are separated from each other by the side extension 52 of the oil isolation plate 50.
[0042] The body plate 51 extends upward from the bottom of the housing 10. Its upper edge 54 is disposed above the lowest point of the circumference of the second small gear 22 of the first shaft 20 and below the position where the second small gear 22 meshes with the second large gear 31 of the second shaft 30. The upper edge 54 has a recess 55. The recess 55 has a contour that follows the circumference of the second small gear 22. With this configuration, the body plate 51 extends upward as far as possible from the bottom of the housing 10, increasing the volume of the lubricating oil holding space S. This allows more lubricating oil to be accommodated and prevents the lubricating oil from overflowing from the lubricating oil holding space S.
[0043] As shown in FIGS. 5 and 6, the oil isolation plate 50 may also have a bottom extension 53. The bottom extension 53 extends vertically from the bottom of the body plate 51 and is inserted between the first large gear 21 of the first shaft 20 and the housing 10. The bottom extension 53 has a contour that follows the circumference of the first large gear 21. Thus, the bottom extension 53 surrounds a part of the circumference of the first large gear 21 from below, thereby further isolating the first large gear 21 from the lubricating oil that has collected at the bottom of the gearbox 100. Since the first large gear 21 has a relatively high rotation speed, by isolating it well, the oil churning loss of the gearbox 100 can be minimized.
[0044] During the operation of the gearbox 100, the lubricating oil flows into the gearbox 100 through a lubricating oil introduction means (not shown) to lubricate and / or cool the transmission components, such as the first shaft 20, the second shaft 30, the third shaft 40, the first large gear 21, the second small gear 22, the second large gear 31, and the first small gear 41. In particular, the lubricating oil that reaches the first large gear 21 and the second large gear 31 will splash from them as the two gears rotate. Specifically, when the vehicle travels forward, the gearbox 100 moves forward. When viewed from the angle shown in FIG. 4, the first shaft 20 rotates counterclockwise, and the second shaft 30 and the third shaft 40 rotate clockwise. Because the second large gear 31 rotates clockwise and its axial position coincides with the lubricating oil retention space S, most of the lubricating oil splashed from the second large gear 31 can directly fall from above into the lubricating oil retention space S.
[0045] On the other hand, the first large gear 21 is offset from the lubricating oil retaining space S, and the lubricating oil scattered from the first large gear 21 falls into the first half housing 11 corresponding to its axial position. Referring to Figs. 7A and 7B, the first half housing 11 is provided with an inclined portion 13 disposed adjacent to the first large gear 21. The inclined portion 13 faces the lubricating oil retaining space S and is inclined downward. The inclined portion 13 cooperates with the bottom extension portion 53 of the oil isolation plate 50 to form an oil guide groove 14 leading to the lubricating oil retaining space S. The lubricating oil that falls into the first half housing 11 is guided by the oil guide groove 14 into the lubricating oil retaining space S.
[0046] 8, the oil isolation plate 50 does not have to have a bottom extension. In this case, a vertically protruding protrusion 56 may be provided on the body plate 51. The downwardly sloping edge of the protrusion 56 cooperates with the sloping portion 13 to form the oil guide groove 14.
[0047] With the above-described structure, when the gearbox 100 moves forward, the lubricating oil splashed from the first large gear 21 and the second large gear 31 will collect in the lubricating oil retention space S, and the risk of the lubricating oil collecting outside the lubricating oil retention space S and being stirred by the first large gear 21 and the second large gear 31 is avoided. When the gearbox 100 moves in the reverse direction, the lubricating oil retention space S has a smaller effect of collecting the lubricating oil. However, since the gearbox moves in the reverse direction, which corresponds to the vehicle moving backwards and which only accounts for a small part of the operating state of the gearbox, there will be no noticeable oil stirring loss.
[0048] 9A and 9B, a filter mounting hole 15 for mounting a filter is provided in the second half housing 12 of the gearbox 100 to achieve circulation of the lubricating oil. The filter mounting hole 15 communicates with the lubricating oil holding space S. The lubricating oil is sucked from the lubricating oil holding space S through a filter mounted in the filter mounting hole 15, and returns to the gearbox 100 after performing operations such as cooling. The filter can filter the lubricating oil that flows through it. However, a part of the contour of the filter mounting hole 15 is exposed to the second large gear 31 of the second shaft 30 beyond the side extension portion 52 of the oil isolation plate 50. In order to prevent the lubricating oil flowing toward the filter mounting hole 15 from overflowing from the lubricating oil holding space S and to substantially isolate the filter mounting hole 15 from the second large gear 31, the oil isolation plate 50 is further provided with a block portion 57 that protrudes parallel to the body plate 51 from the axial edge of the side extension portion 52. The block portion 57 covers a part of the filter mounting hole 15 , in particular the part that extends beyond the side extension portion 52 .
[0049] 4, the main plate 51 is provided with two mounting holes 58 for fixing the oil isolation plate 50 to the housing 10. The oil isolation plate 50 is fixed to the first half housing 11 by screws passing through the mounting holes 58.
[0050] According to another aspect of the present disclosure, there is proposed an electric drive assembly system comprising the gearbox 100 described above.
[0051] According to another aspect of the present disclosure, a vehicle is proposed comprising the electric drive assembly system described above.
[0052] The vehicle may be a conventional fuel vehicle, a plug-in hybrid electric vehicle, a battery electric vehicle, or other type of vehicle. Thus, the vehicle may achieve the functionality of the gearbox described above and have the advantages described above.
[0053] The particular features, structures or characteristics in one or more embodiments of the present disclosure may be combined in any suitable manner.
[0054] The above is an explanation of the present disclosure and should not be considered as limiting the present disclosure. Although several exemplary embodiments of the present disclosure have been described, those skilled in the art will understand that many modifications can be made to the exemplary embodiments without departing from the inherent teachings and advantages of the present disclosure. Accordingly, all such modifications are intended to be included within the scope of the present disclosure as defined by the claims. It should be understood that the above is an explanation of the present disclosure and should not be considered as limiting the present disclosure. Furthermore, 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), Housing (10) and A first shaft (20) housed in the housing (10) and having a first large gear (21), the first shaft (20) rotates about a first rotation axis (X1) which is substantially parallel to the axial direction of the gearbox (100), A second shaft (30) housed in the housing (10) and having a second large gear (31), the second shaft (30) rotates about a second rotation axis (X2) which is substantially parallel to the axial direction of the gearbox (100), A gearbox (100) comprising an oil isolation plate (50) that together with the housing (10) forms a lubricating oil holding space (S) substantially isolated from the first large gear (21) and the second large gear (31).
2. The gearbox (100) according to claim 1, wherein the first shaft (20) further comprises a second small gear (22), the second small gear (22) being rotationally fixed to the first large gear (21) and offset from it in the axial direction.
3. The gearbox (100) further comprises a third shaft (40) housed in the housing (10) and having a first small gear (41), the third shaft (40) rotating about a third rotation axis (X3) which is substantially parallel to the axial direction of the gearbox (100), The first small gear (41) meshes with the first large gear (21), and the second small gear (22) meshes with the second large gear (31). The gearbox (100) according to claim 2, wherein the center of the first shaft (20) is positioned at a height below the line connecting the center of the second shaft (30) and the center of the third shaft (40).
4. The gearbox (100) according to claim 2, wherein the oil isolation plate (50) has a main plate (51) and a side extension (52), the main plate (51) is substantially perpendicular to the axial direction of the gearbox (100), the main plate (51) isolates the lubricating oil holding space (S) from the first large gear (21), and the side extension (52) extends perpendicularly from the side of the main plate (51) adjacent to the second large gear (31) and isolates the lubricating oil holding space (S) from the second large gear (31).
5. The gearbox (100) according to claim 4, wherein the oil isolation plate (50) is a bottom extension (53) extending vertically from the bottom of the main plate (51), and further comprises a bottom extension (53) inserted between the first large gear (21) and the housing (10).
6. The bottom extension (53) has a contour that follows the circumference of the first large gear (21), The gearbox (100) according to claim 5, wherein the side extension (52) has a contour that follows the circumference of the second large gear (31).
7. The gearbox (100) according to any one of claims 4 to 6, wherein the upper edge (54) of the main plate (51) is positioned above the lowest point of the circumference of the second small gear (22) and below the position where the second small gear (22) meshes with the second large gear (31).
8. The gearbox (100) according to claim 7, wherein the upper edge (54) of the main plate (51) has a recess (55) having a contour along the circumference of the second small gear (22).
9. The first large gear (21) of the first shaft (20) and the lubricating oil holding space (S) are offset from each other in the axial direction and are separated from each other by the main plate (51) of the oil isolation plate (50). The gearbox (100) according to any one of claims 4 to 6, wherein the second large gear (31) of the second shaft (30) and the lubricating oil holding space (S) substantially coincide in the axial direction and are separated from each other by the lateral extension (52) of the oil isolation plate (50).
10. The housing (10) comprises a first half-housing (11) and a second half-housing (12) which are integrally fitted together, wherein the first half-housing (11) is close to the first large gear (21) in the axial direction, and the second half-housing (12) is close to the second large gear (31) in the axial direction. The gearbox (100) according to claim 4.
11. The gearbox (100) according to claim 10, wherein the first half housing (11) has an inclined portion (13) positioned in close proximity to the first large gear (21), the inclined portion (13) is inclined downward toward the lubricating oil holding space (S), and the oil isolation plate (50) further comprises a projection (56) that protrudes vertically from the main plate (51), the projection (56) working in cooperation with the inclined portion (13) to form an oil guide groove (14) leading to the lubricating oil holding space (S).
12. The gearbox (100) according to claim 10, wherein the first half housing (11) has an inclined portion (13) positioned in close proximity to the first large gear (21), the inclined portion (13) inclined downward toward the lubricating oil holding space (S), and the oil isolation plate (50) has a bottom extension (53) extending vertically from the bottom of the main body plate (51), and further having a bottom extension (53) inserted between the first large gear (21) and the housing (10), the bottom extension (53) cooperating with the inclined portion (13) to form an oil guide groove (14) leading to the lubricating oil holding space (S).
13. When the gearbox (100) moves forward, at least a portion of the lubricating oil that is scattered from the first large gear (21) of the first shaft (20) falls into the first half housing (11) and is guided into the lubricating oil holding space (S) by the oil guide groove (14). The gearbox (100) according to claim 11 or 12, wherein when the gearbox (100) moves in the forward direction, at least a portion of the lubricating oil scattered from the second large gear (31) of the second shaft (30) falls into the lubricating oil holding space (S).
14. The gearbox (100) according to claim 10, wherein the second half housing (12) further comprises a filter mounting hole (15) for mounting a filter, and the oil isolation plate (50) further comprises a block portion (57) that protrudes parallel to the main body plate (51) from the axial edge of the side extension (52), and the block portion (57) substantially isolates the filter mounting hole (15) from the second large gear (31) by covering a portion of the filter mounting hole (15).
15. An electric drive assembly system comprising the gearbox (100) according to claim 1.
16. A vehicle comprising the electric drive assembly system according to claim 15.