CN219299808U

CN219299808U - Spline lubricating structure of electric drive assembly

Info

Publication number: CN219299808U
Application number: CN202320867669.5U
Authority: CN
Inventors: 陈辉; 鲁方俊; 王克峰
Original assignee: Wuxi Zhongche Haofu Power Assembly Co ltd
Current assignee: Wuxi Zhongche Haofu Power Assembly Co ltd
Priority date: 2023-04-18
Filing date: 2023-04-18
Publication date: 2023-07-04
Anticipated expiration: 2033-04-18

Abstract

The utility model belongs to the technical field of electric drive assemblies, and particularly relates to a spline lubrication structure of an electric drive assembly, which comprises an input shaft, a motor shaft and an oil guide nozzle, wherein the input shaft and the motor shaft are both arranged in a hollow mode, one end of the input shaft is arranged in one end of the motor shaft in a penetrating mode and is connected with one end of the motor shaft through a spline, the oil guide nozzle is arranged in an assembly shell and is communicated with an oil way on the assembly shell, the oil guide nozzle is arranged in one end, which is far away from the motor shaft, of the input shaft, a gap I for oil in the assembly shell to flow through is reserved between the outer side of the oil guide nozzle and the inner side of the end of the input shaft, oil in the assembly shell can flow in through the gap I, meanwhile, oil flowing in an oil way on the assembly shell can flow into the motor shaft through the oil guide nozzle, the oil quantity which flows into the motor shaft along the gap I is larger, and finally the oil quantity which can be sent into a spline area is more sufficient, and the lubricating requirements of the spline can be better met under high-torque and high-speed working conditions.

Description

Spline lubricating structure of electric drive assembly

Technical Field

The utility model belongs to the technical field of electric drive assemblies, and particularly relates to a spline lubrication structure of an electric drive assembly.

Background

At present, in an electric drive assembly, an input shaft of a motor shaft and an input shaft of a speed reducer are connected through a spline, and as a ball bearing of the input shaft is axially and generally selected for selecting a cushion, a certain clearance amount, manufacturing tolerance and the like are provided, when the motor is driven positively and negatively, the motor shaft can axially float, and when the input shaft and the motor shaft are supported by respective bearings, the problem of misalignment of spline pairs can occur, the abrasion of spline areas is easy to occur, failure is caused, and the abrasion is particularly obvious in working occasions with high torque and high rotating speed. When the spline is worn, the service life and reliability of the assembly are easily reduced; high speed NVH problems due to splines can be raised; and the falling object generated by the abrasion of the spline tooth surface can seriously influence the cleanliness of the oil product of the speed reducer assembly, thereby influencing the service life and reliability of gears, bearings, oil seals and the like. Because the internal structure of the electric drive assembly is compact, the motor shaft and the input shaft of the speed reducer are matched through internal and external splines, the input shaft, the motor shaft, the housing bearing seat and the bearing form a relatively closed environment, and oil in other areas is difficult to directly flow to the spline positions for lubrication under the blocking of other parts in the housing of the assembly. Some structures capable of lubricating spline areas are provided in the prior art, such as a lubricating structure for a spline of an input shaft of a gear motor provided in patent number CN202022147339.8, and a structure for cooling a motor shaft and lubricating the spline provided in patent number CN 202021441075.0. The structure is characterized in that oil in the reducer in the electric drive assembly is sent into the input shaft through the oil guide structure, and then flows into the motor shaft through the input shaft, so that the matched spline area is lubricated. However, in working occasions with large torque and high rotation speed, the lubrication requirement of the spline area is relatively larger, the oil quantity at the oil guiding structure can be limited only through the oil in the speed reducer, and in the conveying process, part of the oil can be difficult to be completely conveyed to the spline area due to centrifugal force, so that insufficient lubrication of the spline area is easily caused, and the lubrication structure needs to be further optimized.

Disclosure of Invention

The technical problem to be solved by the utility model is to provide a spline lubrication structure of an electric drive assembly, which is more sufficient in lubrication of a spline.

The utility model comprises an input shaft, a motor shaft and an oil guide nozzle, wherein the input shaft and the motor shaft are hollow, one end of the input shaft is arranged in one end of the motor shaft in a penetrating way and is connected with the motor shaft through a spline, the oil guide nozzle is arranged in the assembly shell and is communicated with an oil way on the assembly shell, the oil guide nozzle is arranged in one end of the input shaft, which is far away from the motor shaft, and a first gap for oil in the assembly shell to flow through is reserved between the outer side of the oil guide nozzle and the inner side of the end of the input shaft.

Still further still include lead oil pipe, lead oil pipe and install inside the input shaft and with the coaxial setting of input shaft, lead the glib talker and wear to establish in leading oil pipe, the clearance one is located and leads between glib talker outside and the oil pipe inboard.

Still further, the oil conduit is in an interference fit with the input shaft.

Furthermore, a first bearing is arranged on the outer side of one end, deviating from the motor shaft, of the input shaft, the input shaft is arranged in the assembly shell in a rotating mode through the first bearing, and an oil passing groove is formed between the outer side surface of the first bearing and the inner side wall of the assembly shell.

Further, the oil passing groove is formed in the inner side wall of the assembly shell.

Furthermore, a second gap for the oil in the assembly shell to flow is arranged between one end of the input shaft, which is far away from the motor shaft, and the end face of the first bearing and the inner side wall of the assembly shell, and the second gap is communicated with the oil groove and the first gap.

Further, the inner diameter of the middle part of the motor shaft is larger than the inner diameter of one end of the motor shaft provided with the spline.

Furthermore, a second bearing is arranged at the outer side of one end of the motor shaft, which is provided with a spline, the end of the motor shaft is arranged in the assembly shell through the second bearing in a rotating way, an oil outlet is arranged on the side face of the motor shaft, the oil outlet is communicated with the inside of the motor shaft, and the oil outlet is positioned outside one side of the second bearing.

Furthermore, the oil outlet is obliquely arranged towards the second bearing.

Further, the oil outlet holes are provided with more than two oil outlet holes, and the more than two oil outlet holes are circumferentially distributed on the side surface of the motor shaft around the axis of the motor shaft.

The utility model has the beneficial effects that the oil in the assembly shell can flow in through the first gap, meanwhile, the oil flowing in the oil way on the assembly shell can flow in through the oil guide nozzle, and the oil flowing in along the first gap flows into the motor shaft to lubricate the spline, namely, the oil is jointly fed into the motor shaft and the spline area by adopting a double-channel path, so that the oil quantity finally fed into the spline area is larger, the lubrication of the spline is more sufficient, and the lubrication requirement of the spline under the working condition of high torque and high rotating speed can be better met.

Drawings

FIG. 1 is a schematic illustration of the location of the section line a-a in an electric drive assembly of the present utility model.

FIG. 2 is a cross-sectional view a-a of FIG. 1 in accordance with the present utility model.

Fig. 3 is an enlarged view of fig. 2 at a in accordance with the present utility model.

FIG. 4 is a schematic illustration of the location of the b-b section line in the electric drive assembly of the present utility model.

FIG. 5 is a cross-sectional view b-b of FIG. 4 in accordance with the present utility model.

FIG. 6 is a schematic representation of the position of the c-c section line in the electric drive assembly of the present utility model.

Fig. 7 is a cross-sectional view of fig. 6 according to the present utility model.

In the drawings, 1-an assembly housing; 11-an oil path; 12-passing through an oil groove; 2-an input shaft; 3-a motor shaft; 31-an oil outlet hole; 4-spline; 5-an oil guide nozzle; 6-oil guide pipe; 7-bearing I; 8-a second bearing; 9-oil cooler.

Detailed Description

As shown in fig. 1-7, the utility model comprises an input shaft 2, a motor shaft 3 and an oil guide nozzle 5, wherein the input shaft 2 is an input shaft of a speed reducer in an electric drive assembly, the motor shaft 3 is a rotating shaft of a motor in the electric drive assembly, the input shaft 2 and the motor shaft 3 are both hollow, one end of the input shaft 2 is provided with an external spline, one end of the motor shaft 3 is provided with an internal spline, the input shaft 2 is arranged in one end of the motor shaft 3 in a penetrating way, and the input shaft 2 and the motor shaft 3 are connected through a spline 4. The oil guide nozzle 5 is arranged inside the assembly shell 1, as shown in fig. 3, the oil guide nozzle 5 is fixedly arranged on the inner side wall of one end of the assembly shell 1, and the oil guide nozzle 5 is communicated with an oil path 11 on the assembly shell 1, wherein the oil path 11 is an oil path 11 which is arranged on the assembly shell 1 and is used for flowing along the assembly shell 1 to take away heat or is used for supplying oil to other parts inside the assembly shell 1, the oil path 11 is communicated with an oil cooler 9 arranged outside the assembly shell 1, the oil guide nozzle 5 is specifically in a tubular structure, the oil guide nozzle 5 is arranged in one end of the input shaft 2, which is far away from the motor shaft 3, and a gap I is reserved between the outer side of the oil guide nozzle 5 and the inner side of the end of the input shaft 2, and the gap I can be used for flowing oil inside the assembly shell 1.

According to the spline lubricating structure provided by the utility model, oil in the assembly shell 1 can flow in through the first gap, meanwhile, the oil flowing in the oil way 11 on the assembly shell 1 can flow in through the oil guide nozzle 5, and the oil flowing in along the first gap flows into the motor shaft 3 to lubricate the spline 4, namely, the oil is jointly fed into the motor shaft 3 and the spline 4 area by adopting a double-channel path, so that the oil quantity finally fed into the spline 4 area is larger, the lubrication of the spline 4 is more sufficient, and the lubricating requirement of the spline 4 under high-torque and high-rotation-speed operation can be better met.

The utility model further comprises an oil guide pipe 6, wherein the oil guide pipe 6 is arranged inside the input shaft 2 and is coaxially arranged with the input shaft 2, the oil guide nozzle 5 is arranged in the oil guide pipe 6 in a penetrating way, and the gap I is positioned between the outer side of the oil guide nozzle 5 and the inner side of the oil guide pipe 6. Because the structural design of input shaft 2, its internal diameter is the fixed size scope that sets up according to the model generally, and during the electric drive assembly work, input shaft 2 follows motor shaft 3 and rotates under the hookup of spline 4, when input shaft 2 internal diameter is great, the unable direct input shaft 2 of fluid, rotatory forward transport of fluid along input shaft 2 inner wall under the effect of centrifugal force, lead to fluid conveying efficiency slow, through setting up oil pipe 6 in input shaft 2 inside, play the effect of reducing the internal diameter, improve the conveying efficiency when fluid passes through along oil pipe 6 inside, make the faster transport of fluid to in the motor shaft 3.

Preferably, the oil guide pipe 6 is in interference fit with the input shaft 2, and the oil guide pipe 6 is assembled in the input shaft 2 by crimping, so that the arrangement of other fixing parts can be reduced.

The outer side of one end of the input shaft 2, which is far away from the motor shaft 3, is provided with a first bearing 7, the first bearing 7 is specifically a rolling bearing, the input shaft 2 is rotatably arranged in the assembly shell 1 through the first bearing 7, referring to fig. 3, a gear mechanism which is a speed reducer and is positioned in the right side area of the first bearing 7 is shown in fig. 7, and oil in the gear mechanism can fall on the first gap through the first bearing 7 and then flows to the motor shaft 3 for lubrication of the spline 4. In one embodiment of the utility model, oil from the gear mechanism passes through the bearing 7 through the gap between the inner and outer races of the bearing 7 and falls in the region above the gap into the gap 7. In the preferred embodiment of the present utility model, as shown in fig. 7, an oil passing groove 12 is disposed between the outer side surface of the first bearing 7 and the inner side wall of the assembly housing 1, the oil passing groove 12 is opened along the axial direction of the first bearing 7, and when the gear mechanism works, the engagement between every two gears has an extrusion effect on oil, so that the oil is extruded from the oil passing groove 12, and the oil can more conveniently and rapidly pass through the first bearing 7 to fall in the area above the first gap.

In the utility model, the outer side surface of the first bearing 7 is attached to the assembly housing 1, and the oil passing groove 12 is specifically formed on the inner side wall of the assembly housing 1, so that the arrangement requirement of the oil passing groove 12 is met under the condition that the first bearing 7 and the assembly housing 1 are normally assembled.

Wherein. The input shaft 2 deviates from the one end of motor shaft 3 and is equipped with the clearance second that supplies the inside fluid of assembly casing 1 to flow between the terminal surface of bearing one 7 and the inside wall of assembly casing 1, clearance second intercommunication is crossed oil groove 12 and clearance first, and the fluid that flows in along crossing oil groove 12 flows in clearance first after clearance second, and the setting of this clearance second can further be convenient for fluid get into clearance first.

Referring to fig. 2 and 3, the motor shaft 3 has two ends, one of the two ends is an end provided with the spline 4, and the region between the two ends on the motor shaft 3 is a middle part of the motor shaft 3, in the utility model, the inner diameter of the middle part of the motor shaft 3 is larger than the inner diameter of the end provided with the spline 4 of the motor shaft 3, so that the oil flowing into the motor shaft 3 can be thrown to the end of the spline 4 directly under the action of centrifugal force, and thus enter the spline 4 for lubrication.

The motor shaft 3 is provided with the one end outside of spline 4 and is provided with bearing two 8, and bearing two 8 are antifriction bearing specifically, and this end of motor shaft 3 rotates through bearing two 8 and sets up in assembly casing 1, the motor shaft 3 side is provided with oil outlet 31, and oil outlet 31 and the inside intercommunication of motor shaft 3, and the fluid in the motor shaft 3 can also be thrown out to bearing two 8 positions from oil outlet 31, and reference figure 3 shows, and on the one hand, the fluid of throwing out to bearing two 8 positions can play lubricated effect to bearing two 8, and on the other hand, the fluid can pass between the inner and outer lane of bearing two 8, falls at the other end of spline 4 along the arrow to lubricate spline 4.

Preferably, the oil outlet hole 31 is obliquely arranged towards the second bearing 8, so that oil can be ensured to be directly thrown onto the second bearing 8 from the oil outlet hole 31. The oil outlet holes 31 are provided with more than two oil outlet holes 31, the more than two oil outlet holes 31 are circumferentially distributed on the side face of the motor shaft 3 around the axis of the motor shaft 3, and the uniformity of distribution of oil thrown out along the oil outlet holes 31 in the circumferential direction of the motor shaft 3 is improved.

Claims

1. The utility model provides a spline lubricating structure of electric drive assembly, characterized by, includes input shaft (2), motor shaft (3) and oil guide mouth (5), input shaft (2) and motor shaft (3) are the cavity setting, and the one end of input shaft (2) wears to establish in the one end of motor shaft (3) and couples through spline (4), oil guide mouth (5) set up inside assembly casing (1) and with oil circuit (11) intercommunication on assembly casing (1), oil guide mouth (5) wear to establish in the one end that input shaft (2) deviate from motor shaft (3), and leave the clearance one that supplies the inside fluid of assembly casing (1) to flow through between the outside of oil guide mouth (5) and this end inboard of input shaft (2).

2. The spline lubricating structure of an electric drive assembly according to claim 1, further comprising an oil guide pipe (6), wherein the oil guide pipe (6) is installed inside the input shaft (2) and coaxially arranged with the input shaft (2), the oil guide nozzle (5) is penetrated in the oil guide pipe (6), and the gap one is located between the outer side of the oil guide nozzle (5) and the inner side of the oil guide pipe (6).

3. Spline lubrication of an electric drive assembly according to claim 2, characterized in that the oil conduit (6) is in an interference fit with the input shaft (2).

4. A spline lubrication structure of an electric drive assembly as claimed in any one of claims 1-3, characterized in that the outer side of one end of the input shaft (2) facing away from the motor shaft (3) is provided with a first bearing (7), the input shaft (2) is rotatably arranged in the assembly housing (1) through the first bearing (7), and an oil passing groove (12) is arranged between the outer side surface of the first bearing (7) and the inner side wall of the assembly housing (1).

5. The spline lubrication structure of an electric drive assembly as claimed in claim 4, wherein said oil passing groove (12) is provided on an inner side wall of the assembly housing (1).

6. The spline lubrication structure of an electric drive assembly according to claim 4, wherein a gap two for oil flow inside the assembly housing (1) is arranged between an end of the input shaft (2) facing away from the motor shaft (3) and an end face of the bearing one (7) and an inner side wall of the assembly housing (1), and the gap two is communicated with the oil groove (12) and the gap one.

7. Spline lubricating structure for an electric drive assembly as claimed in any one of claims 1 to 3, 5 and 6, characterized in that the inner diameter of the middle part of the motor shaft (3) is larger than the inner diameter of the end of the motor shaft (3) where the spline (4) is provided.

8. The spline lubrication structure of an electric drive assembly as claimed in any one of claims 1-3, 5, 6, wherein a bearing two (8) is arranged outside one end of the motor shaft (3) provided with the spline (4), the end of the motor shaft (3) is rotatably arranged in the assembly housing (1) through the bearing two (8), an oil outlet (31) is arranged on the side surface of the motor shaft (3), the oil outlet (31) is communicated with the inside of the motor shaft (3), and the oil outlet (31) is positioned outside one side of the bearing two (8).

9. Spline lubrication structure for an electric drive assembly as claimed in claim 8, characterized in that said oil outlet hole (31) is provided obliquely toward the second bearing (8).

10. The spline lubrication structure of an electric drive assembly as claimed in claim 9, wherein the oil outlet holes (31) are provided with two or more, and the two or more oil outlet holes (31) are circumferentially distributed on the side of the motor shaft (3) around the axis of the motor shaft (3).