Electric drive main speed reduction assembly with improved lubricating system

Abstract

According to the electrically-driven main speed reduction assembly with the improved lubricating system, through the structural arrangement of an oil receiving groove, an oil duct, a gap lubricating space, an oil receiving cover, an inner nut ring and an outer nut ring, when a speed reduction gear rotates, lubricating oil in a first-stage speed reduction cavity is thrown into the oil receiving groove, and the lubricating oil is thrown into the second-stage speed reduction cavity; and then lubricating oil enters the oil receiving cover through the oil duct in the oil receiving groove, and when a large amount of lubricating oil is accumulated in the oil receiving cover, the lubricating oil enters the inner hole of the differential case and enters the spaced lubricating space through the oil passing hole to lubricate the bearing assembly. And the transmission efficiency of the gear and the bearing is improved.

Description

Technical Field

[0001] The invention relates to the technical field of automobile drive axles, in particular to an electric drive main reduction assembly with an improved lubrication system. Background Art

[0002] At present, in the field of automobile drive axles, the structure of the electric drive main reducer assembly is complex, the bearings and gears are arranged in a compact space, and there is a problem that the lubricating oil cannot fully lubricate the gears and bearings, causing the gears and bearings to heat up and fail prematurely, thereby reducing transmission efficiency. Summary of the invention

[0003] In order to overcome the shortcomings of the prior art, the purpose of the present invention is to provide an electric drive main reduction assembly with an improved lubrication system, reasonably optimize the arrangement of components and the oil channel structure, so that the lubricating oil can fully lubricate the gears and bearings, thereby improving the life of the gears and bearings and the transmission efficiency.

[0004] The technical solution of the present invention to solve the above technical problems is as follows: An electric drive main reduction assembly with an improved lubrication system, comprising a main reduction gear housing, a left differential housing, an oil receiving cover, an inner nut ring and an outer nut ring; The main reducer housing has a primary reduction cavity inside, a reduction gear is rotatably installed inside the primary reduction cavity and an oil receiving groove is formed on its side wall, a mounting hole is formed on the main reducer housing at one side of the primary reduction cavity, and the oil receiving groove is connected with the inner space of the mounting hole through an oil passage formed in the main reducer housing; The left differential case includes a tubular portion and a disc-shaped portion, the tubular portion is mounted on the mounting hole, the inner sides of the tubular portion and the disc-shaped portion are provided with a differential case inner hole that penetrates and communicates with each other, a gap lubrication space is formed between the tubular portion and the inner wall of the mounting hole, and an oil hole that communicates with the differential case inner hole and the gap lubrication space is formed on the side wall of the tubular portion; The inner nut ring is sleeved on the outside of the tubular portion and is located at the end of the tubular portion; The outer nut ring is fixed to the main reducer housing, and the inner hole side wall of the outer nut ring is in clearance fit with the outer peripheral surface of the inner nut ring; The oil receiving cover is installed on the outer side of the main reducer housing, and the maximum oil receiving height of the oil receiving cover is higher than the height of the lowest point of the inner hole of the differential housing.

[0005] Compared with the prior art, the technical solution of this application has the following beneficial technical effects: The electric drive main reduction assembly provided by the present application, through the structural arrangement of the oil receiving groove, oil channel, gap lubrication space, oil receiving cover, inner nut ring and outer nut ring, enables the lubricating oil in the primary reduction cavity to be thrown into the oil receiving groove when the reduction gear rotates, and then the lubricating oil enters the oil receiving cover through the oil channel in the oil receiving groove. When the lubricating oil in the oil receiving cover accumulates a lot, it enters the inner hole of the differential case, and enters the gap lubrication space through the oil hole to lubricate the bearing assembly. The present application achieves full lubrication of gears and bearings, improves the life of gears and bearings and transmission efficiency, etc. by reasonably optimizing the arrangement of components and the oil channel structure.

[0006] Based on the above technical solution, the present invention can also be improved as follows.

[0007] Furthermore, an oil guide plate is formed on one side of the oil receiving groove close to the reduction gear, for guiding the lubricating oil thrown up by the reduction gear to the oil receiving groove.

[0008] Furthermore, the oil collecting groove and the oil channel are both located above the oil collecting cover, and a groove is formed along the axial direction of the mounting hole at a position corresponding to the oil channel, one end of the groove extends to the end of the mounting hole, and the groove corresponds to the upper end opening of the oil collecting cover.

[0009] Furthermore, the bearing assembly includes multiple bearings, the side wall of the tubular portion is formed with multiple groups of oil holes, each group of the oil holes is arranged corresponding to one of the bearings, and the inner wall of the tubular portion is formed with an annular oil collecting groove corresponding to each group of the oil holes.

[0010] Furthermore, the plurality of bearings include a first tapered bearing and a needle roller bearing which are sequentially arranged along the axial direction of the tubular portion.

[0011] Furthermore, an oil guide groove is formed on the disc-shaped portion, and the oil guide groove includes a first oil guide section located on the inner wall of the inner hole of the differential case and a second oil guide section located on the disc surface of the disc-shaped portion, the first oil guide section is arranged along the axial direction of the inner hole of the differential case, and the second oil guide section is arranged along the radial direction of the disc-shaped portion, and the first oil guide section and the second oil guide section are connected.

[0012] Furthermore, it also includes a differential right case, the differential left case and the differential right case form a differential internal space, and a differential gear is installed in the differential internal space.

[0013] Furthermore, it also includes a planetary axle, which is formed with an axle oil hole. The axle oil hole includes an axial segment formed corresponding to its axis and a radial segment along its radial direction and connected to the axial segment. An axial oil hole connecting the internal space of the differential and the axial segment is formed on the left case of the differential.

[0014] Furthermore, the side of the inner nut ring close to the disc-shaped portion is tightened by a second conical bearing sleeved on the tubular portion, and an anti-rotation ring is installed on the side of the inner nut ring away from the disc-shaped portion, and the anti-rotation ring is fixed to the end of the left case of the differential through a nut.

[0015] Furthermore, a gap between a side wall of an inner hole of the outer nut ring and an outer peripheral surface of the inner nut ring is no greater than 1 mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic structural diagram of an electric drive main reduction assembly with an improved lubrication system provided by an embodiment of the present invention; Figure 2 for Figure 1 AA cross-sectional diagram; Figure 3 for Figure 2 Schematic diagram of the structure of the middle main reduction housing; Figure 4 This is a schematic diagram of the structure of the main reduction housing in the embodiment of the present application; Figure 5 It is a schematic diagram of the assembly of the oil receiving cover, the inner nut ring, the outer nut ring and the main reduction housing in the embodiment of the present application; Figure 6 for Figure 2 Schematic diagram of the structure of the left housing of the center differential; Figure 7 for Figure 2 Schematic diagram of the structure of the planetary gear shaft. DETAILED DESCRIPTION

[0017] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0018] It will be appreciated that spatial relationship terms such as "under", "beneath", "below", "under", "above", "above", etc., may be used herein to describe the relationship of an element or feature shown in the figures to other elements or features. It will be appreciated that, in addition to the orientations shown in the figures, spatial relationship terms also include different orientations of the device in use and operation. For example, if the device in the accompanying drawings is flipped, an element or feature described as "under other elements" or "under it" or "under it" will be oriented as "on" the other elements or features. Thus, the exemplary terms "under" and "under" may include both upper and lower orientations. In addition, the device may also include additional orientations (e.g., rotated 90° or other orientations), and the spatial descriptors used herein are interpreted accordingly.

[0019] When used herein, the singular forms "a", "an" and " / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" etc. specify the presence of stated features, wholes, steps, operations, components, parts or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof.

[0020] As shown in Figures 1-7, the present application provides an electric drive main reduction assembly with an improved lubrication system, which includes a main reduction gear housing 2, a left differential housing 8, an oil collecting cover 5, an inner nut ring 6 and an outer nut ring 7.

[0021] Among them, the main reducer housing 2 has a primary reduction cavity 2a inside, and a reduction gear 1 is rotatably installed inside the primary reduction cavity 2a and an oil receiving groove 3 is formed on its side wall. It can be understood that the reduction gear 1 is a part of the structure of the primary reduction assembly in the main reducer, and its corresponding structure also includes a driving gear and a reduction gear shaft, which together constitute a primary reduction assembly. The gear structure layout design of the reduction assembly is a relatively mature technical means in this field. There is no obvious innovation in this application. The main purpose of this application is to reconstruct the oil circuit of the lubrication system of the electric drive main reduction assembly, so the specific structure of the reduction assembly will not be elaborated.

[0022] A mounting hole 2 b is formed on one side of the primary reduction cavity 2 a of the main reducer housing 2 , and the oil receiving groove 3 is communicated with the inner space of the mounting hole 2 b through an oil passage 4 formed in the main reducer housing 2 .

[0023] Preferably, an oil guide plate 301 is formed on one side of the oil receiving groove 3 close to the reduction gear 1 , so as to guide the lubricating oil thrown up by the reduction gear 1 to the oil receiving groove 3 .

[0024] The left differential case 8 includes a tubular portion 801 and a disc portion 802. The tubular portion 801 is installed in the mounting hole 2b. The inner sides of the tubular portion 801 and the disc portion 802 are provided with a differential case inner hole 8a that penetrates and connects them. A gap lubrication space k is formed between the tubular portion 801 and the inner wall of the mounting hole 2b. The side wall of the tubular portion 801 is formed with an oil hole 10 that connects the differential case inner hole 8a and the gap lubrication space k.

[0025] The inner nut ring 6 is sleeved on the outside of the tubular portion 801 and is located at the end of the tubular portion 801 .

[0026] In order to ensure the stable connection of the inner nut ring 6, the side of the inner nut ring 6 close to the disc-shaped portion 802 is tightened by a second conical bearing 83 mounted on the tubular portion 801, and an anti-rotation ring is installed on the side of the inner nut ring 6 away from the disc-shaped portion 802. The anti-rotation ring is fixed to the end of the left differential case 8 through a nut.

[0027] The outer nut ring 7 is fixed to the main reducer housing 2, and the inner hole side wall of the outer nut ring 7 is gap-matched with the outer peripheral surface of the inner nut ring 6. The oil collecting cover 5 is installed on the outer side of the main reducer housing 2. Through the arrangement of the inner nut ring 6, the outer nut ring 7 and the oil collecting cover 5, a relatively sealed area is formed at the end of the gap lubrication space k to prevent the lubricating oil entering the gap lubrication space k from overflowing from the end opening position.

[0028] The gap between the inner hole side wall of the outer nut ring 7 and the outer circumference of the inner nut ring 6 is not greater than 1 mm. Preferably, in a preferred embodiment of the present application, the gap between the inner hole side wall of the outer nut ring 7 and the outer circumference of the inner nut ring 6 is 0.5 mm.

[0029] In order to ensure that when the lubricating oil level inside the oil collecting cover 5 accumulates to a certain level, the lubricating oil head can enter from the end of the differential case inner hole 8a, the maximum oil receiving height of the oil collecting cover 5 is higher than the height of the lowest point of the differential case inner hole 8a.

[0030] The electric drive main reduction assembly provided by the present application, when the reduction gear 1 rotates, the lubricating oil in the primary reduction cavity is thrown into the oil receiving groove 3, and then the lubricating oil reaches the inner side of the mounting hole 2b through the oil channel 4 in the oil receiving groove 3, and flows downward into the oil receiving cover 5 under the action of gravity. When the lubricating oil in the oil receiving cover 5 accumulates a lot, it enters the inner hole 8a of the differential case, and enters the interval lubrication space K through the oil hole 10 to lubricate the bearing assembly located in the interval lubrication space K. The present application achieves full lubrication of gears and bearings, improves the service life of gears and bearings and transmission efficiency, etc. by reasonably optimizing the arrangement of components and the oil channel structure.

[0031] In an embodiment of the present application, the oil collecting groove 3 and the oil channel 4 are both located above the oil collecting cover 5, and a groove 401 is formed along the axial direction of the mounting hole 2a at the position of the oil channel 4 corresponding to the mounting hole 2a, and one end of the groove 401 extends to the end of the mounting hole 2a, and the groove 401 corresponds to the upper end opening of the oil collecting cover 5.

[0032] Among them, the bearing assembly includes multiple bearings, and the side wall of the tubular part 801 is formed with multiple groups of oil holes 10, each group of oil holes 10 is set corresponding to a bearing, and the inner wall of the tubular part 801 is formed with an annular oil collecting groove 9 corresponding to each group of oil holes 10. The lubricating oil entering the tubular part 801 from the inner hole 8a of the differential case flows along the tubular part 801 to one end of the disc-shaped part 802. The oil collecting groove 9 can effectively gather the lubricating oil at the corresponding position and transport it to the interval lubrication space K through the oil hole 10 under the action of centrifugal force.

[0033] Specifically, the plurality of bearings include a first cone bearing 81 and a needle bearing 82 which are sequentially arranged along the axial direction of the tubular portion 801 .

[0034] In order to facilitate the lubrication of subsequent components by lubricating oil, an oil guide groove 11 is formed on the disc-shaped portion 802, and the oil guide groove 11 includes a first oil guide section 1101 located on the inner wall of the differential case inner hole 8a and a second oil guide section 1102 located on the disc surface of the disc-shaped portion 802. The first oil guide section 1101 is arranged along the axial direction of the differential case inner hole 8a, and the second oil guide section 102 is arranged along the radial direction of the disc-shaped portion 802, and the first oil guide section 101 and the second oil guide section 102 are connected.

[0035] Correspondingly, it also includes a differential right case 12. The differential left case 8 and the differential right case 12 form an internal space of the differential, and a differential gear 13 is installed in the internal space of the differential.

[0036] The lubricating oil entering from the left end of the differential case inner hole 8a flows to the oil guide groove 11, passes through the first oil guide section 1101 and then the second oil guide section 1102, and then enters the internal space of the differential to lubricate the differential gear 13.

[0037] For the lubrication of the planetary gear axle 14, the planetary gear axle 14 is formed with an axle oil hole 15, and the axle oil hole 151 includes an axial segment 151 formed corresponding to its axis and a radial segment 152 along its radial direction and connected with the axial segment 151. An axial oil hole 13 connecting the internal space of the differential and the axial segment 1411 is formed on the left differential housing 8.

[0038] The lubricating oil enters the oil hole 15 of the planetary gear shaft 14 through the axial oil hole 13 on the left differential case 8 to lubricate the needle bearing on the planetary gear shaft 14 .

[0039] In summary, this application reasonably optimizes the arrangement of components and the oil channel structure so that the lubricating oil can fully lubricate the gears and bearings, thereby improving the life of the gears and bearings and the transmission efficiency. The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An electric drive main reduction assembly with an improved lubrication system, characterized in that: It includes a main reducer housing, a differential left housing, an oil receiving cover, an inner nut ring and an outer nut ring; The main reducer housing has a primary reduction cavity inside, a reduction gear is rotatably installed inside the primary reduction cavity and an oil receiving groove is formed on its side wall, a mounting hole is formed on the main reducer housing at one side of the primary reduction cavity, and the oil receiving groove is connected with the inner space of the mounting hole through an oil passage formed in the main reducer housing; The left differential case includes a tubular portion and a disc-shaped portion, the tubular portion is mounted on the mounting hole, the inner sides of the tubular portion and the disc-shaped portion are provided with a differential case inner hole that penetrates and communicates with each other, a gap lubrication space is formed between the tubular portion and the inner wall of the mounting hole, an oil hole that communicates with the differential case inner hole and the gap lubrication space is formed on the side wall of the tubular portion, and a bearing assembly is installed inside the gap lubrication space; The inner nut ring is sleeved on the outside of the tubular portion and is located at the end of the tubular portion; The outer nut ring is fixed to the main reducer housing, and the inner hole side wall of the outer nut ring is in clearance fit with the outer peripheral surface of the inner nut ring; The oil receiving cover is installed on the outer side of the main reducer housing, and the maximum oil receiving height of the oil receiving cover is higher than the height of the lowest point of the inner hole of the differential housing.

2. The electric drive main reduction assembly with an improved lubrication system according to claim 1, characterized in that: An oil guide plate is formed on one side of the oil receiving groove close to the reduction gear, and is used to guide the lubricating oil thrown up by the reduction gear to the oil receiving groove.

3. The electric drive main reduction assembly with an improved lubrication system according to claim 2, characterized in that: The oil receiving groove and the oil channel are both located above the oil receiving cover, and a groove is formed along the axial direction of the mounting hole at a position of the mounting hole corresponding to the oil channel, one end of the groove extends to the end of the mounting hole, and the groove corresponds to the upper end opening of the oil receiving cover.

4. The electric drive main reduction assembly with an improved lubrication system according to claim 1, characterized in that: The bearing assembly includes a plurality of bearings, the side wall of the tubular portion is formed with a plurality of groups of oil holes, each group of the oil holes is arranged corresponding to one of the bearings, and the inner wall of the tubular portion is formed with an annular oil collecting groove corresponding to each group of the oil holes.

5. The electric drive main reduction assembly with an improved lubrication system according to claim 4, characterized in that: The plurality of bearings include a first tapered bearing and a needle roller bearing which are sequentially disposed along the axial direction of the tubular portion.

6. The electric drive main reduction assembly with an improved lubrication system according to claim 1, characterized in that: An oil guide groove is formed on the disc-shaped portion, and the oil guide groove includes a first oil guide section located on the inner wall of the inner hole of the differential case and a second oil guide section located on the disc surface of the disc-shaped portion, the first oil guide section is arranged along the axial direction of the inner hole of the differential case, and the second oil guide section is arranged along the radial direction of the disc-shaped portion, and the first oil guide section and the second oil guide section are connected.

7. The electric drive main reduction assembly with an improved lubrication system according to claim 1, characterized in that: It also includes a differential right case, wherein the differential left case and the differential right case form a differential internal space, and a differential gear is installed in the differential internal space.

8. The electric drive main reduction assembly with an improved lubrication system according to claim 7, characterized in that: It also includes a planetary axle, which is formed with an axle oil hole. The axle oil hole includes an axial section formed corresponding to its axis and a radial section along its radial direction and connected to the axial section. An axial oil hole connecting the internal space of the differential and the axial section is formed on the left case of the differential.

9. The electric drive main reduction assembly with an improved lubrication system according to claim 1, characterized in that: The side of the inner nut ring close to the disc-shaped portion is pressed against by a second conical bearing sleeved on the tubular portion, and an anti-rotation ring is installed on the side of the inner nut ring away from the disc-shaped portion. The anti-rotation ring is fixed to the end of the left differential case through a nut.

10. The electric drive main reduction assembly with an improved lubrication system according to claim 1, characterized in that: The gap between the inner hole side wall of the outer nut ring and the outer peripheral surface of the inner nut ring is no more than 1 mm.

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