Oil-cooled motor rotary swaging rotor shaft lubricating structure and transmission

Abstract

The invention provides an oil-cooled motor rotary swaging rotor shaft lubricating structure and a transmission, and the structure comprises a box body, an oil injection boss embedded in the box body, a lubricating oil channel communicated with one side, far away from the box body, of the oil injection boss, and a rotor assembly which sleeves the outer surface of the lubricating oil channel and is movably connected with the inner wall of the box body. The rotor assembly comprises a motor rotary swaging rotor shaft arranged on the outer surface of the lubricating oil channel in a sleeving mode, a bearing assembly arranged on the outer surface of the motor rotary swaging rotor shaft in a sleeving mode and used for being connected with the box body, and at least two motor end windings arranged on the motor rotary swaging rotor shaft in a sleeving mode. Oil is thrown into the motor rotary swaging rotor shaft through the radial holes distributed in the surface of the oil guide pipe on the lubricating oil channel, then the oil is thrown out through the radial holes in the motor rotary swaging rotor shaft, lubrication of the rotor assembly is achieved, the oil can be distributed on the surface of the rotor assembly at the first time, lubrication blind areas are avoided to a great extent, and the service life of the motor rotary swaging rotor assembly is prolonged. The lubricating quality is improved.

Description

Technical Field

[0001] This invention relates to the field of motor rotor lubrication technology, and in particular to a lubrication structure for an oil-cooled rotary forged rotor shaft of a motor and a transmission. Background Technology

[0002] Hybrid transmissions and multi-functional transmissions, as cutting-edge applications in the transmission field, utilize different power coupling methods between the engine and motor to maintain their operation within their high-efficiency range, thereby comprehensively improving power and economy. Rotary forged hollow motor rotor shafts are lightweight, have high critical speeds, good rotational balance, and high dimensional accuracy, making them a leading application for motor rotor shafts. Oil cooling, with its highly efficient cooling effect, is widely used for motor cooling and lubrication in transmissions.

[0003] Current rotor shaft lubrication structures typically inject oil into the inner bore from one end, adjusting the rotor shaft as a whole at a specific flow rate to ensure uniformity of oil reaching the end windings. However, as the flow rate changes, the uniformity of oil flow to the end windings cannot be guaranteed, leading to uncertainty in motor lubrication performance. There is even a risk that the motor's lubrication performance may decrease as the lubrication flow rate increases. Furthermore, the inner bore of a rotary forged rotor shaft is larger in the middle and smaller at both ends, creating lubrication blind spots for components on the smaller diameter ends.

[0004] Therefore, there is an urgent need for a rotary forging rotor shaft lubrication structure that can ensure the lubrication of the components on the small diameter at both ends, ensure the uniformity of the oil flow to the end windings at both ends, and make its lubrication flow proportional to the oil flow injected into the rotor shaft. Summary of the Invention

[0005] Based on this, the purpose of this invention is to provide a lubrication structure and transmission for an oil-cooled motor rotary forging rotor shaft, so as to fundamentally solve the problems of lubrication blind spots, poor lubrication uniformity, and inability to guarantee the uniformity of oil flow in the windings at both ends in the current rotor lubrication.

[0006] According to an embodiment of the present invention, a lubrication structure for an oil-cooled motor rotary forging rotor shaft includes a housing, an oil spraying boss embedded in the housing, a lubrication oil passage communicating with the side of the oil spraying boss away from the housing, a rotor assembly sleeved on the outer surface of the lubrication oil passage and movably connected to the inner wall of the housing, and at least two motor end windings sleeved on the radial side of the rotor assembly. The rotor assembly includes a motor rotary forging rotor shaft sleeved on the outer surface of the lubricating oil passage, a bearing assembly sleeved on the outer surface of the motor rotary forging rotor shaft for connecting the housing, and at least two motor end windings sleeved on the motor rotary forging rotor shaft. The lubricating oil passage and the motor rotary forging rotor shaft are each provided with a plurality of radial hole groups corresponding to the motor rotary forging rotor shaft, the bearing assembly and the motor end winding respectively.

[0007] Furthermore, the bearing assembly includes a first bearing and a third bearing sleeved at both ends of the motor rotary forging rotor shaft, and a second bearing sleeved in the middle section of the motor rotary forging rotor shaft.

[0008] Furthermore, the motor end windings are provided in at least two locations, respectively close to the second bearing and the third bearing.

[0009] Furthermore, the lubricating oil passage includes an oil guide pipe disposed at one end away from the oil injection boss, a plug embedded in the oil guide pipe on the side away from the oil injection boss, and an oil seal disposed near the plug.

[0010] Furthermore, the radial hole group includes a first radial hole disposed near at least one of the motor end windings, a second radial hole disposed near another of the motor end windings, a third radial hole and a fifth radial hole disposed near the third bearing, and a fourth radial hole located in the middle section of the lubricating oil passage.

[0011] Furthermore, the third radial hole and the fifth radial hole are arranged opposite to each other, and are used to provide oil lubrication for the end of the motor rotary forging rotor shaft and the third bearing.

[0012] Furthermore, the fourth radial hole is used to provide oil lubrication to the inner side of the forged rotor shaft of the motor.

[0013] Furthermore, the first radial hole and the second radial hole are formed on the motor rotary forging rotor shaft to guide the lubricating oil in the motor rotary forging rotor shaft to be discharged to the motor end winding through the first radial hole and the second radial hole respectively for lubrication.

[0014] In addition, the present invention also provides a transmission, including an oil-cooled motor rotary forging rotor shaft lubrication structure disposed on the transmission.

[0015] Compared with the prior art, the oil-cooled motor rotary forging rotor shaft lubrication structure in the above embodiments of the present invention uses radial holes distributed on the surface of the oil guide pipe on the lubrication oil passage to throw oil into the motor rotary forging rotor shaft, and then throws the oil outward through the radial holes on the motor rotary forging rotor shaft, finally achieving the effect of lubricating and cooling the motor end windings, the first to third bearings, and the oil seal. This method provides targeted oil discharge for the bearings, motor end windings, and oil seals, and the oil can also be distributed on the surface of the above-mentioned components in a timely manner, greatly avoiding lubrication blind spots, improving lubrication quality, and ensuring the uniformity of oil flow to the end windings at both ends. It solves the problems of lubrication blind spots, poor lubrication uniformity, and inability to guarantee the uniformity of oil flow to the windings at both ends in current rotor lubrication. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the lubrication structure of the oil-cooled motor rotary forging rotor shaft and a partial structure of the paper stack in an embodiment of the present invention; Figure 2 This is a partial structural schematic diagram of the lubrication structure of the oil-cooled motor rotary forging rotor shaft in an embodiment of the present invention; Figure 3 This is a partial structural diagram of the detection assembly in the lubrication structure of the oil-cooled motor rotary forging rotor shaft in an embodiment of the present invention.

[0017] Explanation of key component symbols:

[0018] The following detailed description of the embodiments will further illustrate the present invention in conjunction with the above-described accompanying drawings. Detailed Implementation

[0019] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Several embodiments of the invention are illustrated in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

[0020] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0022] Please see Figures 1 to 3 The diagram shows the lubrication structure of the oil-cooled motor rotary forging rotor shaft in an embodiment of the present invention. It includes a housing 1, an oil spraying boss 3 embedded in the housing 1, a lubrication oil passage 2 communicating with the side of the oil spraying boss 3 away from the housing 1, a rotor assembly sleeved on the outer surface of the lubrication oil passage 2 and movably connected to the inner wall of the housing 1, and at least two motor end windings 15 sleeved on the radial side of the rotor assembly. The rotor assembly includes a motor rotary forging rotor shaft 8 sleeved on the outer surface of the lubrication oil passage 2, a bearing assembly sleeved on the outer surface of the motor rotary forging rotor shaft 8 for connecting the housing 1, and at least two motor end windings 15 sleeved on the motor rotary forging rotor shaft 8. The lubrication oil passage 2 and the motor rotary forging rotor shaft 8 are each provided with a plurality of radial hole groups corresponding to the installation positions of the motor rotary forging rotor shaft 8, the bearing assembly, and the motor end windings 15, respectively.

[0023] Furthermore, the bearing assembly includes a first bearing 4 and a third bearing 6 sleeved at both ends of the motor rotary forging rotor shaft 8, and a second bearing 6 sleeved in the middle section of the motor rotary forging rotor shaft 8. At least two motor end windings are provided, respectively located near the second bearing 5 and the third bearing 6. The lubrication oil passage 2 includes an oil guide pipe 12 located away from the oil injection boss 3, a plug 16 embedded in the oil guide pipe 12 on the side away from the oil injection boss 3, and an oil seal 7 located near the plug 16. The radial hole assembly includes a first radial hole 9 located near at least one motor end winding 15, and a second radial hole 9 located near the other motor end winding 15. The third radial hole 11 and the fifth radial hole 14, which are located near the third bearing 6, and the fourth radial hole 13, which are located in the middle section of the lubrication channel 2, are arranged opposite to each other. They are used to guide oil lubrication to the end of the motor rotary forging rotor shaft 8 and the third bearing 6. The fourth radial hole 13 is used to guide oil lubrication to the inner side of the motor rotary forging rotor shaft 8. The first radial hole 9 and the second radial hole 10 are opened on the motor rotary forging rotor shaft 8 to guide the lubricating oil in the motor rotary forging rotor shaft 8 to be discharged to the motor end winding 15 for lubrication along the first radial hole 9 and the second radial hole 10, respectively.

[0024] It should be noted that the motor rotary forging rotor shaft 8 is movably mounted on the housing 1 via the first bearing 4, the second bearing 5, and the third bearing 6. Corresponding radial hole groups are arranged at the motor end winding 15, the first bearing 4, the second bearing 5, the third bearing 6, the oil seal 7, and other components that require lubrication and cooling. The oil guide pipe 12 is fixedly installed in the inner hole of the motor rotary forging rotor shaft 8, and its right end is sealed by the plug 16. Furthermore, the oil guide pipe 12 is specifically provided with a third radial hole 11, a fourth radial hole 13, and a fifth radial hole 14, while the first radial hole 9 and the second radial hole 10 are formed on the motor rotary forging rotor shaft 8. In specific implementation, firstly, the oil pump performs a preset oil supply operation to the lubrication oil passage 11, and the lubrication oil passage 2 guides the oil into the oil spraying boss 3, which then sprays the oil into the oil guide pipe 12. Afterwards, the motor forging rotor shaft 8 drives the oil guide pipe 12, which is fixedly installed inside, to rotate axially in the same direction. During this process, under the action of centrifugal force, the oil can be discharged along the third radial hole 11, the fourth radial hole 13, and the fifth radial hole 14 on the oil guide pipe 12, so that the oil is located inside the motor forging rotor shaft 8 and performs preliminary wetting and cooling. Simultaneously, the third radial hole 11 near the third bearing 6 can carry the oil out during the rotation of the motor forging rotor shaft 8 to complete the lubrication of the third bearing 6. In some optional embodiments, to ensure the lubrication effect of the third bearing 6, a connecting hole can be opened on the motor forging rotor shaft 8 near the third bearing 6, so that after the interior of the motor forging rotor shaft 8 is wetted, the oil is discharged through its own rotation. Centripetal force directly throws the oil onto the third bearing 6 for lubrication. Similarly, the same design can be used at the first bearing 4 and the second bearing 5, with through holes opened on the corresponding positions of the motor rotary forging rotor shaft 8. This allows the oil to be directly discharged onto the motor rotary forging rotor shaft 8 and contact the bearings for efficient lubrication. Essentially, the oil is thrown into the motor rotary forging rotor shaft 8 through the radial holes on the oil guide pipe 12, and then discharged outwards through the radial holes on the motor rotary forging rotor shaft 8. This ultimately lubricates and cools the motor end winding 15, the first to third bearings, and the oil seal 7. This method provides targeted oil discharge for the bearings, motor end winding 15, and oil seal 7, and the oil is distributed to the surfaces of these components immediately, greatly avoiding lubrication blind spots and improving lubrication quality. It solves the problem of poor lubrication due to the large diameter in the middle and small diameter at both ends of the motor rotary forging rotor shaft, resulting in lubrication blind spots for components with smaller diameters at both ends.

[0025] In summary, the oil-cooled motor rotary forging rotor shaft lubrication structure in the above embodiments of the present invention uses radial holes distributed on the surface of the oil guide pipe 12 on the lubrication oil passage 2 to throw oil into the motor rotary forging rotor shaft 8, and then throws the oil outward through the radial holes on the motor rotary forging rotor shaft 8, finally achieving the effect of lubricating and cooling the motor end winding 15, the first to third bearings, and the oil seal 7. This method provides targeted oil discharge for the bearings, motor end winding 15, and oil seal 7, and the oil can be distributed on the surface of the above-mentioned components in a timely manner, greatly avoiding lubrication blind spots, improving lubrication quality, and ensuring the uniformity of oil flow to the end windings at both ends. This solves the problems of lubrication blind spots, poor lubrication uniformity, and inability to guarantee the uniformity of oil flow to the windings at both ends in current rotor lubrication.

[0026] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0027] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A lubrication structure for an oil-cooled rotary forged rotor shaft of a motor, characterized in that, It includes a housing, an oil spraying boss embedded in the housing, a lubricating oil passage communicating with the side of the oil spraying boss away from the housing, a rotor assembly sleeved on the outer surface of the lubricating oil passage and movably connected to the inner wall of the housing, and at least two motor end windings sleeved on the radial side of the rotor assembly. The rotor assembly includes a motor rotary forging rotor shaft sleeved on the outer surface of the lubricating oil passage, a bearing assembly sleeved on the outer surface of the motor rotary forging rotor shaft for connecting the housing, and at least two motor end windings sleeved on the motor rotary forging rotor shaft. The lubricating oil passage and the motor rotary forging rotor shaft are each provided with a plurality of radial hole groups corresponding to the motor rotary forging rotor shaft, the bearing assembly and the motor end winding respectively.

2. The lubrication structure for the oil-cooled motor rotary forging rotor shaft according to claim 1, characterized in that, The bearing assembly includes a first bearing and a third bearing sleeved at both ends of the motor rotary forging rotor shaft, and a second bearing sleeved in the middle section of the motor rotary forging rotor shaft.

3. The lubrication structure for the oil-cooled motor rotary forging rotor shaft according to claim 2, characterized in that, The motor end winding is provided with at least two windings, which are respectively located close to the second bearing and the third bearing.

4. The lubrication structure for the oil-cooled motor rotary forging rotor shaft according to claim 3, characterized in that, The lubrication channel includes an oil guide pipe disposed at one end away from the injection boss, a plug embedded in the oil guide pipe on the side away from the injection boss, and an oil seal disposed near the plug.

5. The lubrication structure for the oil-cooled motor rotary forging rotor shaft according to claim 4, characterized in that, The radial hole group includes a first radial hole disposed near at least one of the motor end windings, a second radial hole disposed near another of the motor end windings, a third radial hole and a fifth radial hole disposed near the third bearing, and a fourth radial hole located in the middle section of the lubrication passage.

6. The lubrication structure for the oil-cooled motor rotary forging rotor shaft according to claim 5, characterized in that, The third radial hole and the fifth radial hole are arranged opposite to each other and are used to lubricate the end of the motor rotary forging rotor shaft and the third bearing.

7. The lubrication structure for the oil-cooled motor rotary forging rotor shaft according to claim 4, characterized in that, The fourth radial hole is used to provide oil lubrication to the inner side of the forged rotor shaft of the motor.

8. The lubrication structure for the oil-cooled motor rotary forging rotor shaft according to claim 7, characterized in that, The first radial hole and the second radial hole are formed on the rotary forging rotor shaft of the motor, and are used to guide the lubricating oil in the rotary forging rotor shaft to be discharged to the motor end winding through the first radial hole and the second radial hole respectively for lubrication.

9. A transmission, characterized in that: The oil-cooled motor rotary forging rotor shaft lubrication structure, as described in any one of claims 1 to 8, is provided on the transmission.

Images