Oil-cooled motor and rotor structure thereof

Abstract

The utility model relates to an oil cooling motor and a rotor structure thereof, the rotor structure comprises a rotating shaft, a rotor iron core and two rotor baffle plates, the rotor iron core is arranged on the rotating shaft and is in interference fit with the rotating shaft, and the two rotor baffle plates are respectively arranged at two ends of the rotor iron core and are in interference fit with the rotating shaft. The gear and the rotating shaft are integrally formed, the section, close to the gear, of the rotating shaft is further fixedly sleeved with an expansion ring, one end of the expansion ring abuts against the gear, the other end of the expansion ring abuts against one rotor baffle, and a steel pressing ring is arranged on one side of the other rotor baffle. The rotating shaft and the gear of the motor are integrated, so that the mechanical loss of spline connection of the speed reducer and the motor is reduced, and the influence of NVH problems such as side frequency is small. The shaft body of the rotating shaft of the motor provided by the utility model is less in diameter change, and the diameter change of the shaft body from the front end (gear end) to the rear end is small, the blank of the shaft can be made of pipe materials, meanwhile, part of machining procedures are reduced, and the manufacturing cost of the shaft is greatly saved.

Description

Technical Field

[0001] This utility model belongs to the field of motor technology, and in particular relates to an oil-cooled motor and its rotor structure. Background Technology

[0002] Currently, there are two main structural forms of oil-cooled motor rotors: 1. Three-shaft type: The motor shaft is a hollow shaft, connected to the reducer via a spline; lubricating oil enters the hollow shaft and, utilizing the centrifugal force of the motor rotation, forms a lubrication circulation through the oil outlet holes on the shaft. 2. Coaxial type: The motor shaft is a hollow shaft, providing lubrication for the rotor while simultaneously press-fitting the reducer's intermediate shaft drive gear at the front end, transmitting power to the reducer through a single-stage gear pair. A connecting half-shaft is inserted inside the motor shaft to achieve power output.

[0003] The two structures described above have the following problems: 1. The three-axis design has a single oil outlet method, resulting in poor stator lubrication. Additionally, the spline connection increases mechanical losses and the NVH (noise, vibration, and harshness) level of the spline. 2. The coaxial design offers better torque transmission and NVH performance compared to the three-axis design, with higher coaxiality. However, it adds the need for press-fitting of gears and shafts.

[0004] In addition, the hollow shafts of the two schemes mentioned above have many diameter variations, requiring rotary forging or spinning processes, which are complex to manufacture; at the same time, it is difficult to drill oblique holes in the shaft, and the machining is difficult, resulting in high overall manufacturing costs. Utility Model Content

[0005] To solve the above-mentioned technical problems, the first objective of this utility model is to provide a rotor structure that is easy to process and assemble, has high transmission efficiency, and can reduce costs; the second objective of this utility model is to provide an oil-cooled motor.

[0006] To achieve the first objective of the above-mentioned utility model, the present utility model adopts the following technical solution:

[0007] A rotor structure includes a rotating shaft, a rotor core, and rotor baffles. The rotor core is mounted on the rotating shaft and is interference-fitted with the rotating shaft. Two rotor baffles are respectively mounted at both ends of the rotor core and are interference-fitted with the rotating shaft. The rotating shaft is characterized in that a gear is provided at one end, and the gear is integrally formed with the rotating shaft. An expansion ring is also sleeved and fixed on a section of the rotating shaft near the gear. One end of the expansion ring abuts against the gear, and the other end abuts against one rotor baffle. A steel pressure ring is provided on one side of the other rotor baffle.

[0008] As a preferred embodiment, the two ends of the rotating shaft are respectively provided with bearing A and bearing B, the end of the expansion ring near bearing A is provided with multiple oil injection inlets, the internal central hole of the rotating shaft forms a central oil passage, and the side wall of the rotating shaft is provided with a through hole communicating with the oil injection inlets.

[0009] As a preferred embodiment, the outer edge of the rotor baffle is provided with multiple oil injection holes, and one side of the rotor baffle is provided with multiple ribs, which together form an oil guiding passage. The oil injection holes are connected to the oil guiding passage, and the side wall of the rotating shaft is provided with through holes that are connected to the oil guiding passage.

[0010] As a preferred embodiment, one side of the rotor baffle is provided with an oil spraying slope, the oil spraying hole is located in the oil spraying slope, and the other side of the rotor baffle is provided with an inner oil guiding recess that communicates with the oil spraying hole.

[0011] To achieve the second objective of the above-mentioned utility model, the present utility model adopts the following technical solution:

[0012] An oil-cooled motor includes a housing, a stator core, windings, and a rotor structure as described in any one of the above. The stator core is fixed to the inner wall of the housing, the windings are inserted into the stator core, and the two ends of the rotor structure's shaft are rotatably connected to the housing.

[0013] As a preferred embodiment, one end of the housing is also provided with a rear end cover, the rear end cover is provided with a rotor cooling pipe, one end of the rotor cooling pipe is located at the shaft, and the side wall of the housing is also provided with a stator cooling pipe, the stator cooling pipe is connected to the cooling oil passage on the stator core.

[0014] As a preferred embodiment, a bearing brush is also fixed on the housing or the end cap at one end of the housing, and the bearing brush abuts against the outer wall of the expansion ring.

[0015] As a preferred embodiment, a resolver stator is fixed on the housing or the end cover at one end of the housing, and a matching resolver rotor is fixed on the expansion ring.

[0016] As a preferred embodiment, bearing A is a cylindrical roller bearing, and bearing B is a ball bearing.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] The motor shaft and gears of this invention are integrated, which reduces the mechanical loss of the reducer and the spline connection of the motor. Power is transmitted directly through two-pole gears, and the input and output are coaxial with high coaxiality. Furthermore, since there are no spline orders and the power transmission path is shortened, the impact on NVH issues such as side frequencies is small.

[0019] The rotor assembly of this utility model relies on the bearing inner ring and expansion ring to press and position itself step by step. The motor shaft has a small diameter change and the diameter change is small from the front end (gear end) to the rear end. The shaft blank can be made of tubular material, which also reduces some machining processes and greatly saves the manufacturing cost of the shaft. Attached Figure Description

[0020] The drawings in the specification, which constitute a part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute a limitation on this application.

[0021] Figure 1 and Figure 2 This is a schematic diagram of the cross-sectional structure of the motor at two different angles according to this utility model;

[0022] Figure 3 This is a schematic diagram of the overall structure of the rotor of this utility model;

[0023] Figure 4 This is a schematic cross-sectional view of the rotor of this utility model;

[0024] Figure 5 This is a schematic diagram of the structure of the expansion ring of this utility model;

[0025] Figure 6 and Figure 7 This is a schematic diagram of the front and back of the rotor baffle of this utility model.

[0026] The attached diagram is labeled as follows: 1. Housing; 11. Rotor cooling pipe; 10. Rear end cover; 12. Stator cooling pipe; 13. Stator core; 22. Winding; 4. Extension ring; 41. Oil injection nozzle; 31. Shaft; 311. Central oil passage; 32. Rotor core; 33. Rotor baffle; 331. Oil injection hole; 332. Inner oil guide notch; 333. Oil injection slope; 330. Oil guide passage; 51. Resolver stator; 52. Resolver rotor; 6. Bearing brush; 7. Bearing A; 8. Bearing B. Detailed Implementation

[0027] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, 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 application pertains.

[0028] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0029] Furthermore, in the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "clockwise," and "counterclockwise," 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.

[0030] 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, unless otherwise stated, "a plurality of" means two or more, unless otherwise expressly defined.

[0031] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of 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.

[0032] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0033] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0034] like Figure 1 and Figure 2As shown, an oil-cooled motor includes a housing 1, a stator core 21, windings 22, and a rotor structure. The stator core 21 is fixed to the inner wall of the housing 1, and the windings 22 are inserted into the stator core 21. The two ends of the rotor structure's shaft are rotatably connected to the housing. One end of the housing 1 is also provided with a rear end cover 10, on which a rotor cooling pipe 11 is provided. One end of the rotor cooling pipe 11 is located at the shaft 31. The side wall of the housing 1 is also provided with a stator cooling pipe 12, which is connected to the cooling oil passages on the stator core.

[0035] like Figure 3 and Figure 4 As shown, a rotor structure includes a rotating shaft 31, a rotor core 32, and rotor baffles 33. The rotor core 32 is mounted on the rotating shaft 31 and is interference-fitted with the rotating shaft 31. Two rotor baffles 33 are respectively mounted at both ends of the rotor core 32 and are interference-fitted with the rotating shaft 31. One end of the rotating shaft 31 is provided with a gear, and the gear is integrally formed with the rotating shaft 31. An extension ring 4 is also sleeved and fixed on a section of the rotating shaft 31 near the gear. One end of the extension ring 4 abuts against the gear, and the other end abuts against one rotor baffle 33. A steel pressure ring is provided on one side of the other rotor baffle 33.

[0036] The rotating shaft 31 has bearings A7 and B8 at its two ends, respectively. Bearing A7 is a cylindrical roller bearing, and bearing B8 is a ball bearing. The expansion ring 4 has multiple oil injection nozzles 41 (e.g., ...) near the bearing A7. Figure 5 As shown), the central hole inside the rotating shaft 31 forms a central oil passage 311, and the side wall of the rotating shaft 31 is provided with a through hole communicating with the oil injection port 41. The end face of the expansion ring is milled with a slanted groove, which, together with the oil outlet hole of the shaft body, leads the lubricating oil to the cylindrical roller bearing.

[0037] like Figure 6 and Figure 7 As shown, the outer edge of the rotor baffle 33 is provided with

[0038] Multiple oil injection holes 331 are provided, and multiple ribs are provided on one side of the rotor baffle 33. The multiple ribs surround and form an oil guiding passage 330. The oil injection holes 331 are connected to the oil guiding passage 330. The side wall of the rotating shaft 31 is provided with a through hole that is connected to the oil guiding passage 330.

[0039] The rotor baffle 33 has an oil spraying slope 333 on one side, and the oil spraying hole 331 is located in the oil spraying slope 333. The rotor baffle 33 has an inner oil guiding recess 332 that communicates with the oil spraying hole 331 on the other side.

[0040] A bearing brush 6 is also fixed on the housing 1 or the end cover at one end of the housing, and the bearing brush 6 abuts against the outer wall of the expansion ring 4. A resolver stator 51 is also fixed on the housing 1 or the end cover at one end of the housing, and a matching resolver rotor 52 is fixed on the expansion ring 4.

[0041] The oil-cooled motor of this invention has the following advantages:

[0042] 1. The motor shaft and gear are integrated, which reduces the mechanical loss of the reducer and motor spline connection. Power is transmitted directly through two-pole gears, and the input and output are coaxial with high coaxiality.

[0043] 2. The rotor assembly relies on the roller bearing inner ring and expansion ring for step-by-step press-fit positioning. The motor shaft has a small diameter change, and the diameter change is small from the front end (gear end) to the rear end. The shaft blank can be made of tubular material, which also reduces some machining processes and greatly saves the manufacturing cost of the shaft.

[0044] 3. Good lubrication effect: The oil outlet holes on the motor shaft body are respectively matched with the expansion ring and the rotor end plate. By adjusting the size of each oil outlet hole on the shaft, the flow rate of lubricating oil to the cylindrical roller bearing and the stator can be effectively adjusted. A cavity is created between the rotor end plate and the rotor core, and oil outlet holes are added to the outer diameter surface. In conjunction with the oil outlet holes on the shaft body, the lubrication of the rotor core is increased. At the same time, centrifugal force is used to throw the lubricating oil to the stator to cool the stator.

[0045] 4. The expansion ring can be used with bearing brushes to solve the problem of bearing electro-corrosion under high-voltage motors.

[0046] 5. Good NVH performance: The absence of spline order and the shortening of the power transmission path result in less impact on NVH issues such as side frequencies.

[0047] In the description of this specification, the 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 present 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.

[0048] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A rotor structure comprising a rotating shaft (31), a rotor core (32), and rotor baffles (33), wherein the rotor core (32) is disposed on the rotating shaft (31) and is interference-fitted with the rotating shaft (31), and two rotor baffles (33) are respectively disposed at both ends of the rotor core (32) and are interference-fitted with the rotating shaft (31), characterized in that, One end of the rotating shaft (31) is provided with a gear, and the gear is integrally formed with the rotating shaft (31). An expansion ring (4) is also sleeved and fixed on a section of the rotating shaft (31) near the gear. One end of the expansion ring (4) abuts against the gear, and the other end abuts against a rotor baffle (33). A steel pressure ring is provided on one side of the other rotor baffle (33).

2. The rotor structure according to claim 1, characterized in that, The two ends of the rotating shaft (31) are respectively provided with bearing A (7) and bearing B (8). The end of the expansion ring (4) near bearing A (7) is provided with multiple oil injection inlets (41). The rotating shaft (31) has a central hole to form a central oil passage (311). The side wall of the rotating shaft (31) is provided with a through hole that communicates with the oil injection inlets (41).

3. The rotor structure according to claim 2, characterized in that, The bearing A (7) is a cylindrical roller bearing, and the bearing B (8) is a ball bearing.

4. A rotor structure according to claim 1, characterized in that, The outer edge of the rotor baffle (33) is provided with multiple oil injection holes (331), and one side of the rotor baffle (33) is provided with multiple ribs, which enclose to form an oil guiding passage (330). The oil injection holes (331) are connected to the oil guiding passage (330), and the side wall of the rotating shaft (31) is provided with a through hole that is connected to the oil guiding passage (330).

5. A rotor structure according to claim 4, characterized in that, The rotor baffle (33) has an oil spraying slope (333) on one side, and the oil spraying hole (331) is located in the oil spraying slope (333). The rotor baffle (33) has an inner oil guiding recess (332) that communicates with the oil spraying hole (331) on the other side.

6. An oil-cooled motor, characterized in that, The rotor structure includes a housing (1), a stator core (21), a winding (22), and a rotor structure as described in any one of claims 1 to 5. The stator core (21) is fixed to the inner wall of the housing (1), the winding (22) is inserted into the stator core (21), and the two ends of the rotor structure are rotatably connected to the housing.

7. An oil-cooled motor according to claim 6, characterized in that, The housing (1) is also provided with a rear end cover (10) at one end, and a rotor cooling pipe (11) is provided on the rear end cover (10). One end of the rotor cooling pipe (11) is located at the rotating shaft (31). A stator cooling pipe (12) is also provided in the side wall of the housing (1). The stator cooling pipe (12) is connected to the cooling oil passage on the stator core.

8. An oil-cooled motor according to claim 6, characterized in that, A bearing brush (6) is also fixed on the housing (1) or the end cap at one end of the housing, and the bearing brush (6) abuts against the outer wall of the expansion ring (4).

9. An oil-cooled motor according to claim 6, characterized in that, A resolver stator (51) is fixed on the housing (1) or the end cap at one end of the housing, and a matching resolver rotor (52) is fixed on the expansion ring (4).

Images