Lubricating structure for electric drive assembly

Abstract

The utility model discloses a lubrication structure for electric drive assembly, including reduction gearbox casing, and the input shaft, output shaft, oil collection chamber and oil line that are provided in reduction gearbox casing, input shaft and output shaft transmission connection, output shaft is provided with output shaft gear, oil collection chamber is located on one side of output shaft gear, oil line is located on one side of output shaft gear, oil line is located on the other side of output shaft gear, and oil line is located on the other side of output shaft gear. The output shaft gear is used for stirring lubricating oil to splash into the oil collecting cavity, the oil way is located below the oil collecting cavity, one end of the oil way is communicated with the oil collecting cavity, and the other end of the oil way extends to the spline of the input shaft. The lubricating structure for the electric drive assembly has the advantages of being simple in structure, good in lubricating effect and high in adaptability.

Description

TECHNICAL FIELD

[0001] The utility model relates to electric drive assembly technical field especially relates to a lubrication structure for electric drive assembly. BACKGROUND

[0002] At present, in the water-cooled electric drive assembly, the spline connection of the motor shaft and the reducer shaft is usually lubricated by splashing oil, but the spline engagement position is usually close to the motor end, the amount of oil entering the spline engagement position is less and the utilization rate is low, and abnormal wear of the spline connection of the motor shaft due to poor lubrication will cause NVH (Noise, Vibration, Harshness) performance, spline ablation and abnormal wear, etc. in the later period, thereby further threatening the reliability of the electric drive assembly.

[0003] Announcement No. CN218863241U discloses a lubrication structure for electric drive input shaft spline, which comprises an input shaft and an oil guide groove, the input shaft is provided with an inner cylindrical surface and an inner spline at the end of the inner cylindrical surface, at least one spiral groove is formed on the inner cylindrical surface, one end of the spiral groove extends to the inner spline, the spiral groove rotating at high speed generates pumping effect, which can guide the lubricating oil to the spline, and the lubricating oil can enter the spline at a faster flow rate. However, there are some deficiencies in this technical solution:

[0004] (1) The spiral groove is added inside the input shaft, which has complex structure, high processing difficulty and cost;

[0005] (2) The lubricating oil is guided by pumping effect, when the input shaft is reversed, the oil in the spiral groove may be discharged, which cannot be cooled, and the adaptability is poor. INVENTION CONTENTS

[0006] The utility model solves the technical problem of overcoming the deficiencies of the prior art, and provides a lubrication structure for electric drive assembly, which has simple structure, good lubrication effect and strong adaptability.

[0007] To solve the above technical problems, the utility model adopts the following technical scheme:

[0008] A lubrication structure for electric drive assembly, comprising a reduction gearbox housing, an input shaft, an output shaft, an oil collecting cavity and an oil path arranged in the reduction gearbox housing, the input shaft is in transmission connection with the output shaft, the output shaft is provided with an output shaft gear, the oil collecting cavity is located on one side of the output shaft gear, the output shaft gear is used to splash lubricating oil into the oil collecting cavity, the oil path is located below the oil collecting cavity, one end of the oil path is in communication with the oil collecting cavity, and the other end extends to the spline of the input shaft.

[0009] As a further improvement of the above technical scheme:

[0010] The input shaft is hollow, and the oil passage extends through the input shaft to the spline of the input shaft.

[0011] The outer periphery of one end of the input shaft is provided with an input shaft bearing, and the oil passage is provided with an oil outlet, which communicates with the space between the outer ring and the inner ring of the input shaft bearing.

[0012] The oil outlet is provided with two, and the two oil outlets are symmetrically arranged on both sides of the input shaft.

[0013] The reduction box shell is further provided with an input shaft bearing chamber and an intermediate shaft bearing chamber, the input shaft bearing is installed in the input shaft bearing chamber, the intermediate shaft and the intermediate shaft bearing are arranged in the intermediate shaft bearing chamber, the intermediate shaft is connected with the input shaft and the output shaft through gear transmission respectively, and the input shaft bearing chamber communicates with the intermediate shaft bearing chamber.

[0014] The reduction box shell is further provided with an oil collecting groove and an oil collecting groove cover plate, and the oil collecting cavity is formed by the oil collecting groove, the oil collecting groove cover plate and the reduction box shell.

[0015] The oil collecting groove is connected with a guide plate, and the guide plate is tangent to the output shaft gear.

[0016] The oil collecting groove cover plate is screw-connected with the oil collecting groove.

[0017] The oil collecting groove cover plate is provided with a positioning rib for positioning the oil collecting groove cover plate.

[0018] The reduction box shell is provided with a process hole for processing the oil passage, and the process hole is provided with a pull-up plug.

[0019] Compared with the prior art, the lubricating structure for the electric drive assembly has the following advantages:

[0020] 1. The lubricating structure for the electric drive assembly is provided with an oil collecting cavity and an oil passage, so that the lubricating oil can flow to the spline of the input shaft under the action of gravity, the spline is lubricated, the lubricating effect is good, compared with the technical scheme that a spiral groove is added inside the input shaft, the structure is simple, the processing difficulty and cost are low, and the turning of the input shaft does not affect the flow of the lubricating oil in the oil collecting cavity, and the adaptability is high.

[0021] 2. The lubricating structure for the electric drive assembly is hollow, so that the oil passage can extend through the input shaft to the spline of the input shaft, the oil passage is avoided from interfering with the rotating output shaft, and the structure is reasonable.

[0022] 3. The lubricating structure for the electric drive assembly is provided with an oil passage, which communicates with the space between the outer ring and the inner ring of the input shaft bearing, so that the lubricating oil in the oil collecting cavity can lubricate the input shaft bearing, the oil utilization rate is high, and the lubricating effect is better.

[0023] 4. The lubricating structure for the electric drive assembly, after the lubricating oil enters the oil path from the oil collecting cavity, part of the lubricating oil enters the space between the outer ring and the inner ring of the input shaft bearing to lubricate the input shaft bearing, another part of the lubricating oil flows to the spline of the input shaft to lubricate the spline of the input shaft, the lubricating oil lubricating the spline returns to the input shaft bearing chamber through the hollow input shaft, and the lubricating oil flows out from the gap between the inner and outer rings of the input shaft bearing and the rolling body and the retainer to the bottom of the reduction gearbox shell, another part of the lubricating oil enters the intermediate shaft bearing chamber from the input shaft bearing chamber to lubricate the intermediate shaft and the intermediate shaft bearing, and the oil utilization rate is higher.

[0024] 5. The lubricating structure for the electric drive assembly, the oil collecting groove forms the bottom of the oil collecting cavity, and the oil collecting groove cover plate and the reduction gearbox shell form the front part and the rear part of the oil collecting cavity respectively, so that the upper part of the oil collecting cavity is open to be able to collect the lubricating oil splashed by the output shaft gear stirring, and the structure is simple and reliable.

[0025] 6. The lubricating structure for the electric drive assembly, the guide plate can guide the lubricating oil splashed by the output shaft gear stirring to flow into the oil collecting cavity, and the oil collecting effect is good. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a front view of the lubricating structure for the electric drive assembly.

[0027] Figure 2 It is an explosion view of the oil collecting cavity and its associated parts in the lubricating structure for the electric drive assembly.

[0028] Figure 3 It is a flow direction schematic view of the lubricating oil in the oil path in the lubricating structure for the electric drive assembly.

[0029] Figure 4 It is a side sectional view of the input shaft in the lubricating structure for the electric drive assembly.

[0030] Figure 5 It is a structural schematic view of the oil collecting groove cover plate in the lubricating structure for the electric drive assembly.

[0031] Legend: 1, reduction gearbox shell; 11, process hole; 12, expansion plug; 2, input shaft; 21, spline; 22, input shaft bearing; 3, output shaft; 31, output shaft gear; 4, oil collecting cavity; 41, oil collecting groove; 42, oil collecting groove cover plate; 43, guide plate; 44, positioning rib; 5, oil path; 51, oil outlet; 6, input shaft bearing chamber; 7, intermediate shaft; 8, intermediate shaft bearing chamber; 9, intermediate shaft bearing. Detailed Implementation

[0032] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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 utility model.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0035] In this utility model, unless otherwise explicitly specified and limited, the terms "assembly," "connection," "joining," and "fixing" 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 or an electrical 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 utility model according to the specific circumstances.

[0036] like Figures 1 to 5 As shown, the lubrication structure for the electric drive assembly in this embodiment includes a gearbox housing 1, and an input shaft 2, an output shaft 3, an oil collecting chamber 4, and an oil passage 5 disposed within the gearbox housing 1. The input shaft 2 is connected to the output shaft 3 in a transmission manner. An output shaft gear 31 is provided on the output shaft 3. The oil collecting chamber 4 is located on one side of the output shaft gear 31. The output shaft gear 31 is used to agitate the lubricating oil and splash it into the oil collecting chamber 4. The oil passage 5 is located below the oil collecting chamber 4. One end of the oil passage 5 is connected to the oil collecting chamber 4, and the other end extends to the spline 21 of the input shaft 2.

[0037] The lubricating structure for the electric drive assembly of the embodiment, when lubricating, the output shaft gear 31 rotates, stirs the lubricating oil in the reduction box shell 1 to splash into the oil collecting cavity 4, the lubricating oil in the oil collecting cavity 4 flows to the spline 21 of the input shaft 2 through the oil path 5 under the action of gravity, and the spline 21 of the input shaft 2 is lubricated. The lubricating structure for the electric drive assembly of the embodiment, by setting the oil collecting cavity 4 and the oil path 5, the lubricating oil can flow to the spline 21 of the input shaft 2 under the action of gravity, and the spline 21 is lubricated, the lubricating effect is good; compared with the technical solution of adding a spiral groove inside the input shaft, the structure is simple, the processing difficulty and cost are low, and the turning of the input shaft 2 does not affect the flow of the lubricating oil in the oil collecting cavity 4, and the adaptability is strong.

[0038] Further, as shown in Figure 4 In the embodiment, the input shaft 2 is hollow, and the oil path 5 extends to the spline 21 of the input shaft 2 through the input shaft 2. The input shaft 2 is hollow, which facilitates the extension of the oil path 5 to the spline 21 of the input shaft 2 through the input shaft 2, avoids the interference between the oil path 5 and the rotating output shaft 2, and has a reasonable structure.

[0039] Further, as shown in Figure 4 In the embodiment, the outer periphery of one end of the input shaft 2 is provided with an input shaft bearing 22, and the oil path 5 is provided with an oil outlet 51, and the oil outlet 51 is in communication with the space between the outer ring and the inner ring of the input shaft bearing 22. By communicating the oil path 5 with the space between the outer ring and the inner ring of the input shaft bearing 22, the lubricating oil in the oil collecting cavity 4 can lubricate the input shaft bearing 22, the oil utilization rate is high, and the lubricating effect is better.

[0040] Further, in the embodiment, the oil outlet 51 is provided with two, and the two oil outlets 51 are symmetrically arranged on both sides of the input shaft 2. The lubricating oil in the oil path 5 enters the space between the outer ring and the inner ring of the input shaft bearing 22 from both sides respectively, reduces the lubricating dead angle, and has a better lubricating effect.

[0041] Further, as shown in Figures 2 to 4As shown, in the embodiment, the input shaft bearing chamber 6 and the intermediate shaft bearing chamber 8 are further arranged in the reduction gearbox housing 1, the input shaft bearing 22 is arranged in the input shaft bearing chamber 6, the intermediate shaft 7 and the intermediate shaft bearing 9 are arranged in the intermediate shaft bearing chamber 8, the intermediate shaft 7 is connected with the input shaft 2 and the output shaft 3 through gear transmission respectively, and the input shaft bearing chamber 6 is communicated with the intermediate shaft bearing chamber 8. After the lubricating oil flows into the oil path 5 from the oil collecting cavity 4, part of the lubricating oil lubricates the input shaft bearing 22 by flowing into the space between the outer ring and the inner ring of the input shaft bearing 22, and the other part of the lubricating oil lubricates the spline 21 of the input shaft 2 by flowing to the spline 21 of the input shaft 2, the lubricating oil lubricating the spline 21 flows back to the input shaft bearing chamber 6 through the hollow input shaft 2, and lubricates the input shaft bearing 22 together with the lubricating oil flowing from the oil outlet 51, finally, part of the lubricating oil in the input shaft bearing chamber 6 flows out to the bottom of the reduction gearbox housing 1 from the gap between the inner and outer rings of the input shaft bearing 22 and the rolling elements and the retainer, and the other part of the lubricating oil flows into the intermediate shaft bearing chamber 8 from the input shaft bearing chamber 6 to lubricate the intermediate shaft 7 and the intermediate shaft bearing, so that the oil utilization rate is higher.

[0042] Further, as shown in Figure 2 and Figure 3 In the embodiment, the oil collecting groove 41 and the oil collecting groove cover plate 42 are further arranged in the reduction gearbox housing 1, the oil collecting cavity 4 is formed by the oil collecting groove 41, the oil collecting groove cover plate 42 and the reduction gearbox housing 1. The oil collecting groove 41 forms the bottom of the oil collecting cavity 4, the oil collecting groove cover plate 42 and the reduction gearbox housing 1 form the front and rear parts of the oil collecting cavity 4 respectively, so that the upper part of the oil collecting cavity 4 is open to collect the lubricating oil splashed by the output shaft gear 31, and the structure is simple and reliable.

[0043] Further, as shown in Figure 2 and Figure 3 In the embodiment, the guide plate 43 is connected to the oil collecting groove 41, and the guide plate 43 is tangent to the output shaft gear 31. The guide plate 43 can guide the lubricating oil splashed by the output shaft gear 31 to flow into the oil collecting cavity 4, so that the oil collecting effect is good.

[0044] Further, as shown in Figure 2 In the embodiment, the oil collecting groove cover plate 42 is threadedly connected with the oil collecting groove 41. The oil collecting groove cover plate 42 is convenient to disassemble with the oil collecting groove 41, so that the oil collecting cavity 4 is convenient to clean and overhaul.

[0045] Further, as shown in Figure 5 In the embodiment, the positioning rib 44 for positioning the oil collecting groove cover plate 42 is arranged on the oil collecting groove cover plate 42. The positioning rib 44 can be positioned when the oil collecting groove cover plate 42 is installed, so that the oil collecting groove cover plate 42 is prevented from rotating.

[0046] Further, as shown in Figure 4As shown, in the embodiment, the speed reduction box shell 1 is provided with a process hole 11 for machining the oil passage 5, and the process hole 11 is provided with a pull-up plug 12. The pull-up plug 12 is in interference fit with the process hole 11, so as to realize the sealing of the oil passage 5.

[0047] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Although the present application has been disclosed as above with a preferred embodiment, it is not intended to limit the present application. Any person skilled in the art can make many possible changes and modifications to the technical scheme of the present application, or modify it into equivalent embodiments with equivalent changes, without departing from the spirit and technical scheme of the present application. Therefore, any simple modification, equivalent replacement, equivalent change and modification made to the above embodiments according to the technical essence of the present application, all still belong to the protection scope of the technical scheme of the present application.

Claims

1. A lubrication arrangement for an electric drive assembly, characterized by: The application relates to a speed reducer, which comprises a speed reducer shell (1), an input shaft (2), an output shaft (3), an oil collecting cavity (4) and an oil channel (5) arranged in the speed reducer shell (1), the input shaft (2) is in transmission connection with the output shaft (3), the output shaft (3) is provided with an output shaft gear (31), the oil collecting cavity (4) is located on one side of the output shaft gear (31), the output shaft gear (31) is used for splashing lubricating oil into the oil collecting cavity (4), the oil channel (5) is located below the oil collecting cavity (4), one end of the oil channel (5) is in communication with the oil collecting cavity (4), and the other end of the oil channel (5) extends to a spline (21) of the input shaft (2).

2. The lubrication arrangement for an electric drive assembly of claim 1, wherein: The input shaft (2) is hollow, and the oil channel (5) extends through the input shaft (2) to the spline (21) of the input shaft (2).

3. The lubrication arrangement for an electric drive assembly of claim 2, wherein: An outer periphery of one end of the input shaft (2) is provided with an input shaft bearing (22), the oil channel (5) is provided with an oil outlet (51), and the oil outlet (51) is in communication with a space between an outer ring and an inner ring of the input shaft bearing (22).

4. The lubrication arrangement for an electric drive assembly of claim 3, wherein: The oil outlet (51) is provided with two oil outlets (51) which are symmetrically arranged on two sides of the input shaft (2).

5. The lubrication arrangement for an electric drive assembly of claim 3, wherein: The speed reducer shell (1) is further provided with an input shaft bearing chamber (6) and an intermediate shaft bearing chamber (8), the input shaft bearing (22) is arranged in the input shaft bearing chamber (6), the intermediate shaft bearing chamber (8) is provided with an intermediate shaft (7) and an intermediate shaft bearing (9), the intermediate shaft (7) is in gear transmission connection with the input shaft (2) and the output shaft (3) respectively, and the input shaft bearing chamber (6) is in communication with the intermediate shaft bearing chamber (8).

6. Lubrication structure for an electric drive assembly according to any one of claims 1 to 5, characterized in that: The speed reducer shell (1) is further provided with an oil collecting groove (41) and an oil collecting groove cover plate (42), and the oil collecting cavity (4) is formed by the oil collecting groove (41), the oil collecting groove cover plate (42) and the speed reducer shell (1).

7. The lubrication arrangement for an electric drive assembly of claim 6, wherein: The oil collecting groove (41) is connected with a guide plate (43), and the guide plate (43) is tangent to the output shaft gear (31).

8. The lubrication arrangement for an electric drive assembly of claim 6, wherein: The oil collecting groove cover plate (42) is in screw connection with the oil collecting groove (41).

9. The lubrication arrangement for an electric drive assembly of claim 6, wherein: The oil collecting groove cover plate (42) is provided with a positioning rib (44) used for positioning the oil collecting groove cover plate (42).

10. The lubrication arrangement for an electric drive assembly according to any one of claims 1 to 5, characterized in that: The speed reducer shell (1) is provided with a process hole (11) used for machining the oil channel (5), and the process hole (11) is provided with a tension plug (12).

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