CN115021495A - Electric drive speed changer motor and cooling and lubricating device of transmission gear thereof - Google Patents

Abstract

The 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 mid-connection plate. Including the oil guide pipe, cooling nozzle and lubricating nozzle, the cooling nozzle and lubricating nozzle are provided with spray holes, and the spray frame is installed and fixed on the center plate through the oil guide pipe, so that the cooling nozzle is located above the outer periphery of the stator , the lubricating nozzle is located on the side of the meshing position of the motor drive gear; a deflector is installed and fixed on the stator, which is located above the outer periphery of the stator winding and below the front end of the cooling nozzle. The invention can perform fine cooling control on the stator and stator windings of the motor, and can actively lubricate the transmission gear of the motor.

Description

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

technical field

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 its transmission gear.

Background technique

With the development and upgrading of hybrid new energy vehicles, the motor used in the vehicle has higher and higher requirements for parameters such as power and torque, which puts forward more requirements for the heat dissipation and cooling of the motor, especially the motor winding in the electric drive transmission. stringent requirements. In practical engineering applications, if a scheme 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, the cooling and heat dissipation of the windings are often realized by spraying the motor windings directly with the nozzles. This oil injection cooling method generally needs to arrange multiple oil rails, and drill round holes with different angles on the oil rails as nozzle holes to spray and cool the motor stator and its windings along the set trajectory and landing point.

Since the stator winding of the motor does not rotate during the actual vehicle operation, the best spray cooling arrangement is to allow the entire stator and its windings to be sprayed evenly by the oil. However, in practical applications, the arrangement of the nozzles has the following limitations: 1) With the increasingly stringent requirements for fuel consumption and energy consumption, the weight and size constraints of the transmission are further strengthened, and the number and length of the fuel injection rails are also limited in the layout. 2) With the reduction of the transmission size, the internal space utilization rate is higher, and the injected oil jet may be blocked by other components and cannot be arbitrarily arranged in the circumferential direction of the motor; 3) In order to improve the transmission efficiency , the amount of oil filling inside the transmission is also limited, and it will even be reduced on the original basis. In this case, the oil flow for spraying the motor and its windings will also be reduced accordingly, which requires improving the spraying utilization rate of the winding oil and avoiding meaningless oil consumption.

SUMMARY OF THE INVENTION

The purpose 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 stator and stator windings of the motor, and can actively lubricate the transmission gear of the motor.

The cooling and lubricating device for the electric drive transmission motor and its transmission gear according to the present invention includes a stator, a stator winding, a rotor, a motor transmission gear and a central connecting plate. The oil guide pipe, the cooling nozzle and the lubricating nozzle are respectively connected with the oil guide pipe. The shower frame is installed and fixed on the central connecting plate through the oil guide pipe, so that the cooling nozzle is located above the outer periphery of the stator, and the lubricating nozzle is located on the side of the meshing part of the motor transmission gear; a guide plate is installed and fixed on the stator, and the guide plate is arc-shaped A guide hole is opened on it, and the guide plate is located above the outer periphery of the stator winding and below the front end of the cooling nozzle.

Both the cooling nozzle and the lubricating nozzle are perpendicular to the oil guide pipe, and the cooling nozzle is arranged in an arc shape matching the stator.

A longitudinal guide groove is longitudinally opened on the guide plate, and the guide hole is located in the longitudinal guide groove.

A transverse guide groove is provided on the guide plate in the transverse direction to separate the longitudinal guide grooves.

Connect the oil inlet hole on the oil guide pipe with the main oil passage of the electric drive transmission. The oil in the main oil passage enters the oil guide pipe under the action of the oil pressure pump, and then enters the cooling nozzle and the lubricating nozzle. The oil sprayed from the spray hole 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, and passes through the vertical guide grooves and lateral guides on the guide plate. The slots and guide holes flow to the stator winding to cool the stator winding; the oil sprayed from the spray holes on the lubricating nozzle lubricates the motor drive gear.

In the present invention, a plurality of cooling nozzles are arranged above the periphery of the motor stator, and a lubricating nozzle is arranged on the side where the motor transmission gear meshes, so the motor stator and stator windings can be finely cooled, and the transmission gear of the motor can be controlled. Active lubrication is carried out; the setting of the deflector improves the direct contact area between the stator winding and the cooling oil, increases the spray area of the oil by about 13%, increases the spray uniformity of the oil by about 29%, and reduces the friction on the stator winding. For temperature unevenness, when the invention is used to cool the stator winding, the maximum and minimum temperature difference on the winding can be guaranteed to be within 30°C under the condition of 8000 rpm and rated power of the motor.

Description of drawings

1 and 2 are axonometric views of the present invention.

Figure 3 is an axonometric view of the deflector.

FIG. 4 is an enlarged view of M in FIG. 3 .

Figure 5 is an axonometric view of the spray frame.

Detailed ways

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

As shown in Figures 1 and 2, the cooling and lubricating device for the electric drive transmission motor and its transmission gear includes a stator 3, a stator winding 1, a rotor 5, a motor transmission gear 6 and a mid-connection plate (not shown in the figure). A spray frame 2 is installed and fixed on the central connecting plate. As shown in FIG. 5 , the spray frame 2 includes an oil guide pipe 24 , four cooling spray pipes 22 and a lubricating spray pipe 25 , the cooling spray pipe 22 and the lubricating spray pipe 25 25 are respectively communicated with the oil guide pipe 24 and are perpendicular to the oil guide pipe 24. The oil guide pipe 24 is provided with an oil inlet hole 23, and the cooling spray pipe 22 and the lubricating spray pipe 25 are provided with a spray hole 21, and the spray frame 2 passes through. The oil guide pipe 24 is installed and fixed on the central connecting plate, 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, and the lubricating nozzle 25 is located on the side of the motor drive gear 6 meshing. . A deflector 4 is installed and fixed on the stator 3 through the mounting ears 42 . As shown in FIGS. 3 and 4 , the deflector 4 is in the shape of an arc, which is located above the periphery of the stator winding 1 and below the front end of the cooling nozzle 22 , the guide plate 4 is provided with a longitudinal guide groove 43 along the longitudinal direction, the longitudinal guide groove 43 is provided with a guide hole 44, and the guide plate 4 is provided with a horizontal guide groove 41 in the horizontal direction, and the longitudinal guide groove 43 separated.

The oil inlet hole 23 on the oil guide pipe 24 is communicated with the main oil passage of the electric drive transmission. The oil in the main oil passage 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 spray pipe 22 is sprayed onto the guide plate 4, and passes through the guide plate 4. The longitudinal guide grooves 43, the transverse guide grooves 41 and the guide holes 44 on the plate 4 flow to the stator winding 1 to cool the stator winding 1; The transmission gear 6 is lubricated.

Claims (4)

1. Electric drive derailleur motor and drive gear's cooling and lubrication device thereof, including stator (3), stator winding (1), rotor (5), motor drive gear (6) and well yoke plate, its characterized in that: a spray frame (2) is fixedly arranged on the middle yoke plate and comprises an oil guide pipe (24), a cooling spray pipe (22) and a lubricating spray pipe (25), the cooling spray pipe and the lubricating spray pipe are respectively communicated with the oil guide pipe, an oil inlet hole (23) is formed in the oil guide pipe, spray holes (21) are formed in the cooling spray pipe and the lubricating spray pipe, the spray frame is fixedly arranged on the middle yoke plate through the oil guide pipe, so that the cooling spray pipe is positioned above the periphery of the stator, and the lubricating spray pipe is positioned on the side face of the meshing part of the motor transmission gear; a guide plate (4) is fixedly arranged on the stator, the guide plate is arc-shaped, guide holes (44) are formed in the guide plate, and the guide plate is positioned above the periphery of the stator winding and below the front end of the cooling spray pipe.

2. The cooling and lubrication device for the motor and the transmission gear of the electrically-driven transmission according to claim 1, wherein: the cooling spray pipe (22) and the lubricating spray pipe (25) are both vertical to the oil guide pipe (24), and the cooling spray pipe is arranged in an arc shape matched with the stator (3).

3. The cooling and lubricating device for the motor and the transmission gear of the electrically-driven transmission according to claim 1 or 2, characterized in that: the guide plate (4) is longitudinally provided with a longitudinal guide groove (43), and the guide hole (44) is positioned in the longitudinal guide groove.

4. The cooling and lubrication device for the motor and the transmission gear of the electrically-driven transmission according to claim 3, wherein: and the guide plate (4) is transversely provided with a transverse guide groove (41) for separating the longitudinal guide grooves (43).

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