Cooling and lubricating device for electric drive transmission motor and its transmission gear

Abstract

The present invention relates to a cooling and lubricating device for an electric drive transmission motor and its transmission gear, comprising a stator, a stator winding, a rotor, a motor transmission gear and a center link plate, a spray rack is fixedly mounted on the center link plate, the spray rack comprises an oil guide pipe, a cooling nozzle and a lubricating nozzle, spray holes are provided on the cooling nozzle and the lubricating nozzle, the spray rack is fixedly mounted on the center link plate through the oil guide pipe, so that the cooling nozzle is located above the periphery of the stator, and the lubricating nozzle is located on the side of the motor transmission gear meshing; a guide plate is fixedly mounted on the stator, which is located above the periphery of the stator winding and below the front end of the cooling nozzle. The present invention can perform fine cooling control on the motor stator and stator winding, and can actively lubricate the transmission gear of the motor.

Description

Technical Field

[0001] The invention relates to a cooling and lubricating device for an electric drive transmission, in particular to a cooling and lubricating device for an electric drive transmission motor and a transmission gear thereof. Background Art

[0002] With the development and upgrading of hybrid new energy vehicles, the requirements for parameters such as power and torque used in the whole vehicle are getting higher and higher, which puts more stringent requirements on the heat dissipation and cooling of the motors in the electric drive transmission, especially the motor windings. In actual engineering applications, if a solution similar to the engine water jacket structure is used to cool the motor windings, the design structure is very complicated and the cooling effect is not ideal. Therefore, a nozzle is often used to directly spray the motor windings to achieve cooling and heat dissipation of the windings. This oil spray cooling method generally requires the arrangement of multiple oil rails, and circular holes at different angles are drilled on the oil rails as spray holes, and the motor stator and its windings are sprayed and cooled along the set trajectory and landing point.

[0003] Since the motor stator winding does not rotate during actual vehicle operation, the best spray cooling layout is to enable the entire stator and its windings to be evenly sprayed with oil. However, in actual applications, the layout of the nozzle has the following limitations: 1) With the increasingly stringent requirements for fuel consumption and energy consumption, the weight and size constraints on the transmission are further strengthened, and the layout of the injection track is also restricted by the number and length; 2) With the reduction in the size of the transmission, the internal space utilization rate is required to be higher, and the sprayed oil beam may be blocked by other components and cannot be arbitrarily arranged around the motor; 3) In order to improve the efficiency of the transmission, the amount of oil filled inside the transmission is also limited, and may even be reduced on the original basis. In this case, the oil flow rate used to spray the motor and its windings will also be reduced accordingly, which requires improving the spray utilization rate of the winding oil to avoid meaningless oil consumption. Summary of the invention

[0004] The object of the present invention is to provide a cooling and lubricating device for an electric drive transmission motor and its transmission gear, which can perform fine cooling control on the motor stator and stator windings and can actively lubricate the transmission gear of the motor.

[0005] The cooling and lubrication device of the electric drive transmission motor and its transmission gear described in the present invention includes a stator, a stator winding, a rotor, a motor transmission gear and a center connecting plate. A spray rack is fixedly installed on the center connecting plate. The spray rack includes an oil guide pipe, a cooling nozzle and a lubricating nozzle. The cooling nozzle and the lubricating nozzle are respectively connected to the oil guide pipe. An oil inlet hole is provided on the oil guide pipe. Spray holes are opened on the cooling nozzle and the lubricating nozzle. The spray rack is fixedly installed on the center connecting plate through the oil guide pipe so that the cooling nozzle is located above the periphery of the stator and the lubricating nozzle is located on the side of the motor transmission gear meshing position; a guide plate is fixedly installed on the stator. The guide plate is in an arc shape and has guide holes opened on it. The guide plate is located above the periphery of the stator winding and below the front end of the cooling nozzle.

[0006] The cooling nozzle and the lubrication nozzle are both perpendicular to the oil guide pipe, and the cooling nozzle is arranged in an arc shape matching the stator.

[0007] A longitudinal guide groove is provided on the guide plate in the longitudinal direction, and the guide hole is located in the longitudinal guide groove.

[0008] A transverse guide groove is opened in the transverse direction along the guide plate to separate the longitudinal guide grooves.

[0009] The oil inlet hole on the oil guide pipe is connected to the main oil channel of the electric drive transmission. The oil in the main oil channel enters the oil guide pipe under the action of the oil pressure pump, and then enters the cooling nozzle and the lubrication nozzle. The oil sprayed from the spray hole on the cooling nozzle cools the motor stator, and the oil sprayed from the spray hole at the front end of the cooling nozzle is sprayed onto the guide plate, flows to the stator winding through the longitudinal guide groove, transverse guide groove and guide hole on the guide plate, and cools the stator winding; the oil sprayed from the spray hole on the lubrication nozzle lubricates the motor transmission gear.

[0010] Since the present invention is provided with a plurality of cooling nozzles above the periphery of the motor stator and a lubricating nozzle is provided on the side of the meshing position of the motor transmission gear, the motor stator and the stator winding can be finely cooled and controlled, and the transmission gear of the motor can be actively lubricated; and the provision of the guide plate increases the direct contact area between the stator winding and the cooling oil, so that the spraying area of ​​the oil is increased by about 13%, the uniformity of the oil spray is increased by about 29%, and the temperature non-uniformity on the stator winding is reduced. When the present invention is used to cool the stator winding, the motor can be operated at 8000 revolutions per minute and rated power, and the maximum and minimum temperature difference on the winding can be guaranteed to be within 30°C. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 and Figure 2 It is an axonometric drawing of the present invention.

[0012] Figure 3 Axonometric view of the deflector.

[0013] Figure 4 for Figure 3 Enlarged view of point M in the middle.

[0014] Figure 5 This is the axonometric view of the spray rack. DETAILED DESCRIPTION

[0015] The present invention will now be described in further detail with reference to the accompanying drawings.

[0016] like Figure 1 and Figure 2 As shown, the cooling and lubricating device of the electric drive transmission motor and its transmission gear comprises a stator 3, a stator winding 1, a rotor 5, a motor transmission gear 6 and a center link plate (not shown in the figure), on which a spray rack 2 is fixedly mounted. Figure 5 As shown, the spray rack 2 includes an oil guide pipe 24, four cooling nozzles 22 and a lubricating nozzle 25. The cooling nozzle 22 and the lubricating nozzle 25 are respectively connected to the oil guide pipe 24 and are perpendicular to the oil guide pipe 24. An oil inlet hole 23 is provided on the oil guide pipe 24, and a spray hole 21 is provided on the cooling nozzle 22 and the lubricating nozzle 25. The spray rack 2 is fixed to the center plate through the oil guide pipe 24, so that the four cooling nozzles 22 are located above the outer periphery of the stator 3 and are arranged in an arc shape matching the stator 3. The lubricating nozzle 25 is located on the side of the meshing part of the motor transmission gear 6. A guide plate 4 is fixed to the stator 3 through a mounting ear 42, as shown in FIG. Figure 3 and Figure 4 As shown, the guide plate 4 is arc-shaped and is located above the periphery of the stator winding 1 and below the front end of the cooling nozzle 22. A longitudinal guide groove 43 is longitudinally opened on the guide plate 4, and a guide hole 44 is opened in the longitudinal guide groove 43. A transverse guide groove 41 is transversely opened on the guide plate 4 to separate the longitudinal guide groove 43.

[0017] The oil inlet hole 23 on the oil guide pipe 24 is connected to the main oil channel of the electric drive transmission. The oil in the main oil channel enters the oil guide pipe 24 under the action of the oil pressure pump, and then enters the cooling nozzle 22 and the lubricating nozzle 25. The oil sprayed from the spray hole 21 on the cooling nozzle 22 cools the motor stator 3, and the oil sprayed from the spray hole 21 at the front end of the cooling nozzle 22 is sprayed onto the guide plate 4, and flows to the stator winding 1 through the longitudinal guide groove 43, the transverse guide groove 41 and the guide hole 44 on the guide plate 4 to cool the stator winding 1; the oil sprayed from the spray hole 21 on the lubricating nozzle 25 lubricates the motor transmission gear 6.

Claims

1. A cooling and lubricating device for an electric drive transmission motor and its transmission gear, comprising a stator (3), a stator winding (1), a rotor (5), a motor transmission gear (6) and a center connecting plate, characterized in that: A spray rack (2) is fixedly mounted on the center link plate, the spray rack comprising an oil guide pipe (24), a cooling nozzle (22) and a lubricating nozzle (25), the cooling nozzle and the lubricating nozzle being respectively connected to the oil guide pipe, an oil inlet hole (23) being provided on the oil guide pipe, and spray holes (21) being provided on the cooling nozzle and the lubricating nozzle. The spray rack is fixedly mounted on the center link plate via the oil guide pipe, so that the cooling nozzle is located above the periphery of the stator, and the lubricating nozzle is located on the side of the meshing position of the motor transmission gear; a guide plate (4) is fixedly mounted on the stator, the guide plate being in an arc shape and having a guide hole (44) provided thereon, the guide plate being located above the periphery of the stator winding and below the front end of the cooling nozzle; the cooling nozzle (22) and the lubricating nozzle (25) are both perpendicular to the oil guide pipe (24), and the cooling nozzle is arranged in an arc shape matching the stator (3).

2. The cooling and lubricating device for the electric drive transmission motor and its transmission gear according to claim 1, characterized in that: A longitudinal guide groove (43) is provided on the guide plate (4) in the longitudinal direction, and the guide hole (44) is located in the longitudinal guide groove.

3. The cooling and lubricating device for the electric drive transmission motor and its transmission gear according to claim 2, characterized in that: A transverse guide groove (41) is provided on the guide plate (4) in the transverse direction to separate the longitudinal guide grooves (43).

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