Oil-cooled motor with oil circuit structure and motor oil circuit cooling system

Abstract

An oil-cooled motor with an oil circuit structure and a motor oil circuit cooling system belong to the field of motor technology. The motor includes a stator and a rotor; the stator core is provided with an armature main assembly ear arranged along the axial direction of the stator core and an armature auxiliary assembly ear provided at one end of the stator core; the stator core is assembled in the motor when the armature main assembly ear is located at its top; main oil pipes arranged along the axial direction of the stator core are provided on both sides of the armature main assembly ear located at the top of the stator core; the surface of the main oil pipe is arranged with a plurality of small holes for spraying the cooling oil in the main oil pipe onto the outer surface of the stator core and the outer surface of the windings at both ends of the stator; a cooling oil cavity for the cooling oil to enter is provided between the windings at both ends of the stator and the outer side of the dynamic balance plates at both ends of the rotor; the front and rear bearing chambers of the motor have cooling oil introduction channels; the oil pan of the motor collects the cooling oil that passes through the stator core, windings, and bearing chambers. The system includes the above-mentioned motor, an oil pump, and an oil-water radiator. The present invention can be widely matched with reducers of different systems, increasing the reliability of the power system and being economical.

Description

Technical Field

[0001] The present invention belongs to the technical field of motors, and in particular relates to an oil-cooled motor with an oil circuit structure and a motor oil circuit cooling system. Background Art

[0002] Among motor cooling methods, one involves using cooling oil to directly contact the wear-producing components of the motor's stator and rotor, dissipating heat. This cooling method currently primarily utilizes a structure that sprays the cooling oil through conduits or fine holes onto the surfaces of wear-producing components, while also providing lubrication for the bearing raceways. This existing oil circuit structure typically relies on the powertrain system to provide the oil circuit and flow distribution, sharing the oil circuit system with the gearbox / transmission. This requires significant modifications to the existing gearbox system or the development of a new gearbox with an oil cooling system. This significantly limits the compatibility of oil-cooled motors with gearboxes.

[0003] Invention patent application CN201810007002.1 discloses a hybrid electric vehicle motor cooling system and method, specifically including an oil pipe, an oil pump, and an oil cooler. The oil pipe is provided with an opening for spraying lubricating oil from the transmission onto the motor. In this system, the motor and transmission share a common oil circuit, making it impossible to use a gearbox with a different system. Summary of the Invention

[0004] In response to the problems existing in the prior art, the present invention proposes an oil-cooled motor with an oil circuit structure and a motor oil circuit cooling system. Under the premise of ensuring the reliability of the motor cooling system, the independent motor oil circuit cooling system can be used for a single motor or shared with the reduction gearbox oil circuit, thereby being able to widely match reduction gearboxes of different systems, thereby increasing the reliability of the power system and being economical.

[0005] The present invention is achieved through the following technical solutions:

[0006] The present invention discloses an oil-cooled motor with an oil circuit structure, comprising a stator and a rotor disposed within the stator. The stator core of the stator is provided with an armature main assembly lug and an armature auxiliary assembly lug, the armature main assembly lug being arranged axially along the stator core, and the armature auxiliary assembly lug being disposed at one end of the stator core. The stator core is assembled within the motor when the armature main assembly lug is located at the top of the stator core. Main oil pipes are provided on both sides of the armature main assembly lug located at the top of the stator core, the main oil pipes being arranged axially along the stator core. The main oil pipes have a plurality of small holes arranged on the surface of the main oil pipes for spraying cooling oil in the main oil pipes onto the outer surface of the stator core and the outer surfaces of windings at both ends of the stator. A cooling oil cavity for cooling oil is provided between the windings at both ends of the stator and the outer sides of dynamic balancing plates at both ends of the rotor. The front and rear bearing chambers of the motor have cooling oil introduction channels for introducing cooling oil sprayed from the main oil pipes into the bearing chambers. The motor further comprises an oil sump disposed at the bottom of the motor housing for collecting cooling oil passing through the stator core, windings, and bearing chambers.

[0007] The oil-cooled motor of the present invention can be cooled independently without relying on the structure of the reduction box / gearbox, and can also be used together with the reduction box / gearbox. Therefore, this oil-cooled motor has a wide range of applications and improves the power density and reliability of the entire power system.

[0008] After spraying out of the small holes in the main oil pipe, cooling oil flows downward into the oil pan, driven by gravity. This eliminates the need for specialized structural guidance, requiring minimal modification to the motor's internal structure. For rotor cooling, this invention eliminates the need for a separate oil flow system. Instead, the rotor is cooled by the grooves in the dynamic balancing plate, which carry the cooling oil. Simultaneously, the rotor's rotation evenly distributes the cooling oil from the dynamic balancing plate onto the inner surfaces of the windings at both ends. Finally, the oil pan recovers the cooling oil that has flowed through the stator core, windings, and bearing chamber.

[0009] Preferably, the armature main assembly ear located at the top of the stator core is located in the gravity direction of the motor when it is arranged on the entire vehicle.

[0010] Preferably, a groove is provided on the outer side of the dynamic balancing plate, and the groove is used to receive the cooling oil entering through the cooling oil cavity.

[0011] Preferably, the inlet of the cooling oil introduction channel is arranged on the side of the front and rear bearing chambers, and the cooling oil introduction channel introduces cooling oil into the bearing chamber where the bearing is assembled.

[0012] Preferably, the oil pan has a certain depth so that the oil in the oil pan can cool part of the stator core and winding at the bottom of the motor, and the oil level is lower than the stator air gap and rotor air gap of the motor.

[0013] Preferably, the armature has two main assembly ears, which are symmetrically arranged on the stator core; the armature has two auxiliary assembly ears, which are symmetrically arranged and arranged on the symmetrical planes of the two main assembly ears.

[0014] Preferably, the armature has one main assembly ear and two auxiliary assembly ears; the two auxiliary assembly ears are symmetrically arranged, and the main assembly ear is located on the center line between the two auxiliary assembly ears.

[0015] A motor oil circuit cooling system comprises an oil pipe, an oil pump, an oil-water radiator, and the oil-cooled motor with the oil circuit structure; the cooling oil in the oil pan is pumped out by the oil pump and sent into the main oil pipe through the oil-water radiator.

[0016] The cooling system is a circulating cooling system. While the cooling oil is collected in the oil pan, it can be pumped out by the oil pump for cooling and then returned to the main oil pipe for reuse, with high energy utilization efficiency.

[0017] Preferably, the oil pump and the oil-water radiator are placed outside the motor housing; or, the oil pump and the oil-water radiator are placed inside the motor housing.

[0018] Preferably, the system further comprises a filter provided in the oil pan, and the filter is used for filtering the cooling oil in the oil pan and then sending the filtered oil into the oil pump.

[0019] The present invention has the following beneficial effects:

[0020] The present invention provides an oil-cooled motor with an oil circuit structure and a motor oil circuit cooling system:

[0021] (1) From the perspective of power system matching, the oil-cooled motor with oil circuit structure can be matched with reducers of different structural forms, which greatly expands the application range of the oil-cooled motor and also improves the power density and reliability of the entire power system;

[0022] (2) From a mechanical perspective, there is little improvement to the internal structure of the motor, and the rotor does not need independent oil flow;

[0023] (3) From the perspective of heat dissipation and cooling of the motor, due to the use of two main oil pipes, the cooling oil is evenly distributed on the surface of the stator core. At the same time, there is a certain amount of oil in the bottom oil pan, which can cool part of the bottom stator core and winding. At the same time, the oil is thrown off by the dynamic balance plates of the rotor at both ends, so that the cooling oil is evenly distributed on the inner surface of the winding at both ends, thereby improving the overall cooling capacity of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a structural schematic diagram of a stator core in an oil-cooled motor with an oil circuit structure according to the present invention;

[0025] Figure 2 This is a schematic diagram of the partial structure of the rotor end portion of an oil-cooled motor with an oil circuit structure according to the present invention;

[0026] Figure 3 This is a structural schematic diagram of a bearing chamber in an oil-cooled motor with an oil circuit structure according to the present invention;

[0027] Figure 4 This is a structural schematic diagram of an embodiment of a stator core in an oil-cooled motor with an oil circuit structure according to the present invention;

[0028] Figure 5 This is a structural schematic diagram of another embodiment of a stator core in an oil-cooled motor with an oil circuit structure according to the present invention;

[0029] Figure 6 This is a schematic diagram of the principle of a motor oil circuit cooling system of the present invention;

[0030] Figure 7 This is a structural schematic diagram of a motor oil circuit cooling system (external oil pump and oil-water radiator) of the present invention;

[0031] 1- stator core; 11- armature main assembly ear; 12- armature auxiliary assembly ear; 2- main oil pipe; 3- dynamic balance plate; 31- groove; 4- bearing chamber; 41- inlet; 5- oil pan; 6- oil pump, 7- oil-water radiator; 8- filter; 9- rotor; 10- stator coil. DETAILED DESCRIPTION

[0032] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0033] like Figure 1-3 The present invention provides an oil-cooled motor with an oil circuit structure, including a stator and a rotor disposed within the stator. The stator is composed of an armature, which is composed of a stator core, windings, and insulating materials. The stator core has various combinations of outer diameter, length, number of slots, and slot shape. The stator core is composed of two or more punching sheets, each having the same outer diameter. The first type of punching sheets are first stacked continuously for a certain length, and then the second type of punching sheets are stacked continuously for a certain length.

[0034] Figure 1 The stacked stator core 1 is shown. The stator core 1 is equipped with a main armature mounting lug 11 and an auxiliary armature mounting lug 12. The main armature mounting lug 11 is arranged axially along the stator core 1, while the auxiliary armature mounting lug 12 is located at one end of the stator core 1. The main armature mounting lug serves as the primary mounting location and is secured with long bolts. The auxiliary armature mounting lug serves as an auxiliary mounting location and is secured with screws, increasing the overall rigidity of the core and reducing vibration.

[0035] The stator core 1 is assembled in the motor when the armature main assembly ear 11 is located at the top (see Figure 7 ). Main oil pipes 2 are provided on both sides of the armature main assembly ears 11 located at the top of the stator core 1, and the main oil pipes 2 are arranged axially along the stator core 1. A number of small holes are arranged on the surface of the main oil pipe 2, which are used to spray the cooling oil in the main oil pipe 2 onto the outer surface of the stator core 1 and the outer surface of the windings at both ends of the stator. A cooling oil cavity for the cooling oil to enter is provided between the windings at both ends of the stator and the outer sides of the dynamic balancing plates 3 at both ends of the rotor. The front and rear bearing chambers 4 of the motor have cooling oil introduction channels for introducing the cooling oil sprayed from the main oil pipe 2 into the bearing chambers. The motor also includes an oil pan provided at the bottom of the motor housing, which is used to gather the cooling oil passing through the stator core 1, windings, and bearing chambers 4.

[0036] The main oil pipe 2 is arranged on both sides of the armature main assembly ears at the top of the stator core 1, which can facilitate the cooling oil to spray out from the main oil pipe and onto the outer surface of the stator core and the outer surface of the windings at both ends of the motor. Under the action of the gravity of the cooling oil, the cooling oil can effectively flow downward from the top of the stator core. Preferably, the armature main assembly ears at the top of the stator core are located in the gravity direction of the motor arrangement on the whole vehicle. In addition, a number of small holes are arranged in the length direction of the oil pipe, which can spray the cooling oil in the axial direction of the stator core and flow downward along the circumferential direction of the stator core, and can evenly spray the cooling oil onto the outer surface of the stator core and the outer surface of the windings at both ends of the motor. Among them, a number of small holes can be evenly arranged or staggered.

[0037] Figure 4 、 5 Two stator core structures are shown. In one embodiment, there are two armature main assembly ears 11, which are symmetrically arranged on the stator core 1. There are two armature auxiliary assembly ears 12, which are symmetrically arranged and arranged on the symmetrical planes of the two armature main assembly ears 12 (see Figure 4 Each armature main mounting ear has a mounting hole at each end of the stator core. Figure 4 As an example, the formation of the stator core is explained. Taking into account the stator punching sheet material of the section stator, the stator punching sheet is cut into a square shape, making full use of the maximum diagonal size of the square. One type of punching sheet extends two armature main assembly ears symmetrically, and the second type of punching sheet adds two armature auxiliary assembly ears on the symmetrical surface of the first type of punching sheet. First, the first type of punching sheet is continuously stacked for a certain length, and then the second type of punching sheet is continuously stacked for a length of about 10 mm to form the stator core. In another embodiment, there is one armature main assembly ear; there are two armature auxiliary assembly ears. The two armature auxiliary assembly ears are symmetrically arranged, and the armature main assembly ear is located on the center line between the two armature auxiliary assembly ears (refer to Figure 5). It is equivalent to that the two armature auxiliary mounting ears and the armature main mounting are arranged in an isosceles triangle layout. Each armature main mounting ear has a mounting hole at both ends of the stator core. Based on the effectiveness of the stator surface cooling oil flow and the heat dissipation performance of the motor, it is preferred Figure 5 From the perspective of mechanical structure, the latter embodiment can reduce the material consumption of the core manufacturing by about 15%-20%, while taking into account the reliability of the structure.

[0038] like Figure 2 The dynamic balancing plate 3 has a groove 31 on its outer side, which is used to receive cooling oil entering through the cooling oil chamber. The cooling oil sprayed by the main oil pipe 2 onto the surfaces of the windings at both ends flows through the cooling oil chamber and falls into the grooves 31 of the dynamic balancing plates at both ends of the rotor. As the rotor rotates, centrifugal force causes the cooling oil that falls onto the dynamic balancing plates to be evenly flung onto the inner surfaces of the windings at both ends, cooling the windings and the rotor. The cooling oil chamber forms the space connecting the windings and the dynamic balancing plates.

[0039] like Figure 3 The inlet 41 of the cooling oil introduction channel is arranged on the side of the front and rear bearing chambers 4. The cooling oil introduction channel introduces the cooling oil into the bearing chamber where the bearings are assembled, and introduces part of the cooling oil that flows out from the small holes at both ends of the main oil pipe into the bearing chamber to lubricate and cool the bearings.

[0040] After passing through the stator core 1, windings, and bearing chamber 4, the cooling oil is collected in the oil pan at the bottom of the motor housing. The oil pan has a certain depth and can store a certain amount of oil. This ensures that under normal vehicle conditions, the oil level in the motor oil pan can cool a portion of the stator core and windings at the bottom. However, the oil level must be below the air gap between the motor stator and rotor. Furthermore, considering that the liquid level cannot exceed the minimum air gap when climbing a 30-degree slope, the oil level should preferably not exceed the minimum air gap. Preferably, the oil pan should have a certain amount of oil so that approximately one-fifth of the bottom surface of the stator core is immersed in cooling oil, avoiding large areas without cooling oil.

[0041] like Figure 6 The present invention also provides a motor oil cooling system, comprising an oil pipe, an oil pump 6, an oil-water radiator 7, and the oil-cooled motor with the above-mentioned oil circuit structure. The cooling oil in the oil pan 5 is pumped out by the oil pump 6 and fed into the main oil pipe 2 via the oil-water radiator 7. The system also includes a filter, preferably a flat filter 8, located in the oil pan to filter out larger particles of debris in the cooling oil and protect the oil pump 6. The filtered cooling oil is connected to the oil pump 6 via an oil pipe. The oil pump pumps the filtered cooling oil, cools it through the oil-water radiator 7, and then flows into the main oil pipe 2 to cool the stator and rotor of the motor, forming a circulating operation.

[0042] Among them, the oil pump 6 and the oil-water radiator 7 can be external (such as Figure 7 ), the two are connected by a soft oil pipe, and the structural design of the motor housing is also made into a built-in type, reducing additional external pipelines and making the overall system more compact and beautiful. Figure 7 In the embodiment, the oil pump 6 is provided outside the motor housing and is arranged near the oil pan 5, and the oil-water radiator is arranged outside the motor housing and above the oil pump 6. The oil pump 6 is connected to the main oil pipe 2 through an oil inlet pipe.

[0043] Those skilled in the art will appreciate that the embodiments of the present invention described above and shown in the accompanying drawings are intended to be illustrative only and are not intended to limit the present invention. The objectives of the present invention have been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and illustrated in the embodiments. Any variations or modifications may be made to the embodiments of the present invention without departing from the principles described.

Claims

1. An oil-cooled motor with an oil circuit structure, comprising a stator and a rotor disposed within the stator; the stator core of the stator is provided with an armature main mounting lug and an armature auxiliary mounting lug, the armature main mounting lug being arranged axially along the stator core, and the armature auxiliary mounting lug being provided at one end of the stator core; characterized in that: The stator core is assembled in the motor when the armature main assembly ear is located at the top of the stator core; main oil pipes are provided on both sides of the armature main assembly ear located at the top of the stator core, and the main oil pipes are arranged along the axial direction of the stator core; a plurality of small holes are arranged on the surface of the main oil pipes for spraying cooling oil in the main oil pipes onto the outer surface of the stator core and the outer surface of the windings at both ends of the stator; a cooling oil cavity for cooling oil to enter is provided between the windings at both ends of the stator and the outer sides of the dynamic balancing plates at both ends of the rotor; the front and rear bearing chambers of the motor have cooling oil introduction channels for introducing the cooling oil sprayed from the main oil pipes into the bearing chambers; the motor also includes an oil pan provided at the bottom of the motor housing for collecting cooling oil passing through the stator core, windings and bearing chambers.

2. The oil-cooled motor with an oil circuit structure according to claim 1, characterized in that: The armature main assembly ear located on the top of the stator core is located in the gravity direction of the motor arrangement on the vehicle.

3. The oil-cooled motor with an oil circuit structure according to claim 1, characterized in that: A groove is provided on the outer side of the dynamic balancing plate, and the groove is used to receive the cooling oil entering through the cooling oil cavity.

4. The oil-cooled motor with an oil circuit structure according to claim 1, characterized in that: The inlet of the cooling oil introduction channel is arranged on the side of the front and rear bearing chambers, and the cooling oil introduction channel introduces cooling oil into the position where the bearing is assembled in the bearing chamber.

5. The oil-cooled motor with an oil circuit structure according to claim 1, characterized in that: The oil pan has a certain depth so that the oil in the oil pan can cool part of the stator core and winding at the bottom of the motor, and the oil level is lower than the stator air gap and rotor air gap of the motor.

6. The oil-cooled motor with an oil circuit structure according to claim 1, characterized in that: There are two armature main assembly ears, which are symmetrically arranged on the stator core; there are two armature auxiliary assembly ears, which are symmetrically arranged and arranged on the symmetrical planes of the two armature main assembly ears.

7. The oil-cooled motor with an oil circuit structure according to claim 1, characterized in that: The armature has one main assembly ear and two auxiliary assembly ears. The two auxiliary assembly ears are symmetrically arranged, and the main assembly ear is located on the center line between the two auxiliary assembly ears.

8. A motor oil circuit cooling system, comprising an oil pipe, an oil pump and an oil-water radiator; characterized in that: It also includes the oil-cooled motor with an oil circuit structure as claimed in claim 1; the cooling oil in the oil pan is pumped out by an oil pump and sent into the main oil pipe through an oil-water radiator.

9. The motor oil circuit cooling system according to claim 8, characterized in that: The oil pump and the oil-water radiator are placed outside the motor housing; or, the oil pump and the oil-water radiator are placed inside the motor housing.

10. The motor oil circuit cooling system according to claim 8, characterized in that: The oil filter further comprises a filter arranged on the oil pan, and the filter is used for filtering the cooling oil in the oil pan and then sending the filtered cooling oil to the oil pump.

Images