WO2021238762A1

WO2021238762A1 - Hybrid cooling motor

Info

Publication number: WO2021238762A1
Application number: PCT/CN2021/094879
Authority: WO
Inventors: 裴正强; 刘霞; 余平; 王海斌
Original assignee: 精进电动科技股份有限公司
Priority date: 2020-05-25
Filing date: 2021-05-20
Publication date: 2021-12-02
Also published as: CN111478521A

Abstract

Disclosed in the present application is a hybrid cooling motor, comprising a housing, a stator core, a front end cover, a rear end cover, a cooling water path, and a cooling oil path. The cooling water path comprises a water inlet nozzle, a water outlet nozzle, and a stretching water channel; the water inlet nozzle and the water outlet nozzle are arranged on the peripheral wall of the housing, the stretching water channel is distributed in the housing, the cooling water path is used for taking away heat on the back of the stator core; the cooling oil path comprises an oil inlet, a cooling oil channel, and an oil outlet; the oil inlet is arranged on the outer peripheral wall of the upper part of the housing, the oil inlet is communicated with the inside of the motor by means of the cooling oil channel, the oil outlet is arranged at the lower part of the front end cover and/or the rear end cover, and the cooling oil path is used for taking away heat in the motor and lubricating bearings. The cooling water path and the cooling oil path are designed in the motor of the present application, the motor is subjected to dual cooling, the inside of the motor is lubricated, and the motor is compact in structure, small in size and high in performance density.

Description

Hybrid cooling motor

Technical field

This application relates to the technical field of motor cooling, and in particular to a hybrid cooling motor.

Background of the invention

Due to its own characteristics, the motor will generate heat during operation, which will increase the temperature and affect the life and performance. In order to ensure the stable operation of the motor for a long time, the temperature of the motor needs to be controlled within a reasonable range.

The cooling of motors in the prior art includes air cooling, water cooling, and oil cooling, among which air cooling is mainly used for low-power motors, and high-power motors are generally water-cooled or oil-cooled. At present, most drive motors adopt water-cooling structure, but the water-cooling scheme cannot effectively cool the inside of the motor. The internal heat can only be conducted to the casing through air, but the effect of air conduction is poor, which causes the casing temperature when the motor is working. Not high, but the actual internal temperature of the motor is still very high. The oil cooling method can directly cool the inside of the motor. Since the heat inside the motor is concentrated in the winding part, fixed-point cooling cannot be performed. At the same time, a mixed cooling method of oil cooling and water cooling is adopted. The structure generally includes an oil cooling circulation system arranged inside the motor, a water cooling module arranged at the motor housing, and a heat exchange module. The heat exchange module includes a heat exchange oil passage. And the heat exchange channel, the heat absorbed by the cooling oil in the heat exchange oil channel is transferred to the cooling water in the heat exchange channel, and the above-mentioned cooling water enters the external water cooling device to complete the heat exchange, but the above-mentioned heat exchange module is generally installed directly It is set on the outside of the motor casing and protruding from the motor casing, which increases the volume of the motor. During installation, a separate installation space needs to be reserved at the corresponding heat exchange module, so that the working conditions of the motor installation are high. , Installation is inconvenient.

Summary of the invention

In view of the above-mentioned problems, this application proposes a hybrid cooling motor to solve or partially solve the above-mentioned problems.

In order to achieve the above-mentioned purpose, the technical solution of this application is realized as follows:

The present application provides a hybrid cooling motor, the motor includes a housing, a stator core, a front end cover, a rear end cover, a cooling water circuit, and a cooling oil circuit;

The cooling water path includes a water inlet, a water outlet, and a stretched water channel; the water inlet and the water outlet are arranged on the outer peripheral wall of the housing, the stretched water channel is distributed in the housing, and the cooling The function of the water circuit is to take away the heat from the back of the stator core;

The cooling oil passage includes an oil inlet, a cooling oil passage, and an oil outlet; the oil inlet is arranged on the outer peripheral wall of the upper part of the housing, and the oil inlet is connected to the motor through the cooling oil passage. Internal communication, the oil outlet is arranged at the lower part of the front end cover and/or the rear end cover, and the cooling oil passage functions to take away heat in the motor and lubricate the bearings.

Further, the cooling oil passage includes an oil inlet groove, the oil inlet groove is arranged in the upper part of the housing and extends in the axial direction inside the housing, and the two ends are formed by the front end cover and the rear end. The cover is defined, and the oil inlet groove is communicated with the inside of the motor through an oil passage;

The bottoms of the two ends of the oil inlet groove are respectively provided with a first oil outlet hole and a second oil outlet hole. Stator winding.

Further, the bottoms of the first oil outlet hole and the second oil outlet hole are respectively provided with a first oil separating ring and a second oil separating ring, the first oil separating ring and the second oil separating ring The upper part is respectively provided with a first fuel injection nozzle group and a second fuel injection nozzle group.

Further, the first oil separating ring is fixed to the housing or the front end cover by a fixing screw and a T-shaped wedge, and the second oil separating ring is fixed to the housing by a fixing screw and a T-shaped wedge. Or the rear end cover is fixed.

Further, the fixing screw and the housing or the front end cover or the rear end cover are sealed by a copper gasket.

Further, the cooling oil path further includes an oil collecting groove provided at the bottom of the casing, and at least one end of the oil collecting groove is located corresponding to the oil outlet.

Further, the part of the stretched water channel at the end of the casing is sealed by an aluminum ring.

Further, the stretching water channel is distributed in one week in the housing, and the stretching water channel is a continuous S-shaped or labyrinth-shaped.

Further, an oil drain port is provided on the casing or the front end cover or the rear end cover.

Further, the water inlet and the water outlet are arranged on the same side of the outer peripheral wall of the casing or arranged at an interval of 180 degrees.

Using the above-mentioned hybrid cooling motor has the following advantages:

On the one hand, the hybrid cooling motor of the present application can take away the heat from the back of the stator core during the water circulation process by providing a cooling water circuit in the motor housing; The winding is cooled, and the oil enters the motor from the cooling oil circuit, and at the same time plays a role of cooling and lubricating the bearing; the hybrid cooling motor in this application has a compact structure, small volume, good cooling performance, and high performance density; The oil drain hole is set to facilitate the motor's oil drain maintenance.

The above description is only an overview of the technical solution of this application. In order to understand the technical means of this application more clearly, it can be implemented in accordance with the content of the specification, and in order to make the above and other purposes, features and advantages of this application more obvious and understandable. , The specific implementations of this application are cited below.

Brief description of the drawings

By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only used for the purpose of illustrating the preferred embodiments, and are not considered as a limitation to the application. Also, throughout the drawings, the same reference symbols are used to denote the same components. In the attached picture:

Figure 1 shows a schematic diagram of the internal structure of a hybrid cooling motor in an embodiment of the present application;

Figure 2 shows a diagram of the positional relationship between the oil divider ring and the fuel injection nozzle in an embodiment of the present application;

FIG. 3 shows a schematic diagram of the fixing structure of the oil distribution ring in an embodiment of the present application;

Figure 4 shows a perspective view of a hybrid cooling motor in an embodiment of the present application;

Figure 5 shows a left side view of the hybrid cooling motor in an embodiment of the present application;

Fig. 6 shows a schematic structural diagram of a motor housing in an embodiment of the present application.

The meanings of the reference signs in the figure are as follows: 1. The front end cover, 2. The first oil divider ring, 3. The first fuel injection nozzle group, 4. The sealing plug, 5. The housing, 6. The water inlet/outlet nozzle, 7. Stator core, 8, stator winding, 9, rear end cover, 10, second oil divider ring, 11, second fuel injection nozzle group, 12, bearing, 13, fixing screw, 14, copper washer, 15, T Type wedge, 16, oil inlet, 17, oil outlet, 18, oil collecting groove, 6-1, water inlet, 6-2, water outlet.

How to implement this application

Hereinafter, exemplary embodiments of the present application will be described in more detail with reference to the accompanying drawings. Although the exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided for a more thorough understanding of the application and to fully convey the scope of the application to those skilled in the art.

In order to describe the technical solution of the present application more clearly, it is specified that the left side in FIG. 1 is the front end or the front side, and the right side is the back end or the rear side.

As shown in Figures 1 and 4, an embodiment of the present application provides a hybrid cooling motor. The motor includes a housing 5, a stator core 7, a front end cover 1, a rear end cover 9, a cooling water circuit and a cooling oil circuit; The body 5 is an aluminum casting or iron casting. The front end cover 1 and the rear end cover 9 are fixed on both ends of the housing 5 by bolts or screws. The front end cover 1 and the rear end cover 9 are provided with bearings 12, and the rotor shaft is realized by the bearings 12 The fixed support.

The cooling water path includes a water inlet 6-1, a water outlet 6-2 and a stretched water channel; the water inlet 6-1 and the water outlet 6-2 are arranged on the outer peripheral wall of the shell 5, and the stretched water channel is distributed in the shell 5. , The cooling water path acts to take away the heat from the back of the stator core 7; the water enters the housing 5 from the water inlet 6-1, circulates through the stretched water channel in the housing 5, and is drained from the water outlet 6-2. The circulation of water takes away the heat in the housing 5, and since the back of the stator iron core 7 is in contact with the housing 5, the iron core stator 7 can be cooled.

The cooling oil path includes an oil inlet 16, a cooling oil passage, and an oil outlet 17. The oil inlet 16 is arranged on the outer peripheral wall of the upper part of the housing 5. The oil inlet 16 communicates with the inside of the motor through the cooling oil passage. According to Figure 5, The oil outlet 17 is arranged at the lower part of the front end cover 1 and/or the rear end cover 9, and the cooling oil path functions to take away heat in the motor and lubricate the bearings.

The oil enters the cooling oil passage from the oil inlet 16, and then enters the motor from the cooling oil passage to cool the components inside the motor, such as the stator winding 8, while also cooling and lubricating the bearing 12. After the inside of the motor is cooled, it is removed through the oil outlet 17, and then the heat inside the motor is taken away. The cooling oil circuit and the cooling water circuit in the motor work independently and do not interfere with each other.

The hybrid cooling motor in this embodiment has a compact structure and a small volume. Since dual cooling can be realized, the cooling effect is good, which greatly improves the performance and working efficiency of the motor.

In one embodiment, the cooling oil passage includes an oil inlet groove, which is arranged in the upper part of the housing 5. The oil inlet groove is composed of an axial through cavity on the housing 5, a front end cover 1 and a rear end cover 9, and is located at the front end. The above-mentioned oil inlet groove can also be formed on the cover 1 or the rear end cover 9. The oil inlet groove can divide the oil in two directions to realize the diversion. The two ends of the oil inlet groove respectively introduce the oil into the motor through the oil passages. In this way, the oil inlet 16 is communicated with the inside of the motor through the oil inlet groove.

According to Figures 1 and 6, the oil inlet groove can be arranged at the interval of the stretching water channel on the shell, so that the oil inlet groove and the stretching water channel do not interfere with each other.

The above-mentioned oil passage includes oil outlet holes. Specifically, a first oil outlet hole and a second oil outlet hole are respectively opened at the bottoms of both ends of the oil inlet groove, and preferably the positions of the first oil outlet hole and the second oil outlet hole are respectively The stator windings 8 at both ends of the stator core 7 are facing directly. After the oil enters the oil inlet tank through the oil inlet 16, it flows out from the first oil outlet hole and the second oil outlet hole respectively, and the outflow oil just contacts the stator winding 8 and takes away the heat from the stator winding 8. When drilling the first oil outlet hole and the second oil outlet hole, in order to facilitate processing, there will also be drilling holes at the corresponding positions of the upper part of the first oil outlet hole and the second oil outlet hole. Therefore, in the drilling A sealing plug 4 is provided on the top to realize the sealing of the oil inlet groove.

In a preferred embodiment, as shown in Figure 2, at the bottom of the first oil outlet hole and the second oil outlet hole, that is, a position close to the stator winding 8 is provided with a first oil divider ring 2 and a second oil divider ring. 10. The first oil divider ring 2 and the second oil divider ring 10 are respectively provided with a first fuel injection nozzle group 3 and a second fuel injection nozzle group 11, the first fuel injection nozzle group 3 and the second fuel injection nozzle group 11 It is a combination of multiple fuel injectors. The oil can be injected onto the stator winding 8 through the first fuel injection nozzle group 3 and the second fuel injection nozzle group 11.

In one embodiment, as shown in FIG. 3, the first oil divider ring 2 is fixed to the front end cover 1 or the housing 5 by a fixing screw 13 and a T-shaped wedge 15, and the second oil divider ring 10 is also fixed by a fixing screw 13 and The T-shaped wedge 15 is fixed to the rear cover 9 or the housing 5, wherein the fixing screw 13 passes through the oil inlet groove in the radial direction from the upper part to the lower part, and the bottom of the

oil distribution ring

2 or 10 is fixed. Fix the oil distribution ring in the direction.

When the oil inlet groove is composed of the cavity on the front end cover 1, the axial through cavity on the housing 5 and the rear end cover 9, the first oil separating ring 2 is fixed to the front end cover 1 by the fixing screw 13 and the T-shaped wedge 15 , The second oil divider ring 10 is fixed to the housing 5 by a fixing screw 13 and a T-shaped wedge 15; The oil separating ring 2 and the second oil separating ring 10 are fixed to the housing 5 by a fixing screw 13 and a T-shaped wedge 15; when the oil inlet groove is the front cover 1, the axial through cavity on the housing 5 and the rear cover 9 When the cavity is formed, the first oil separating ring 2 is fixed to the housing 5 by the fixing screw 13 and the T-shaped wedge 15, and the second oil separating ring 10 is fixed to the rear cover 9 by the fixing screw 13 and the T-shaped wedge 15 ; When the oil inlet groove is composed of the cavity on the front end cover 1, the axial through cavity on the housing 5 and the cavity on the back end cover 9, the first oil separating ring 2 passes through the fixing screw 13 and the T-shaped wedge 15 It is fixed to the front end cover 1, and the second oil distribution ring 10 is fixed to the rear end cover 9 through a fixing screw 13 and a T-shaped wedge 15.

In one embodiment, as shown in FIG. 3, the nut of the fixing screw 13 and the housing 5 or the front end cover 1 or the rear end cover 9 are sealed by a copper gasket 14 to prevent oil leakage.

In an embodiment, as shown in FIGS. 5-6, the cooling oil circuit further includes an oil collecting groove 18 provided at the bottom of the casing 5, and at least one end of the oil collecting groove 18 corresponds to the oil outlet 17. After the oil cools and lubricates the inside of the motor, it flows to the oil collecting groove 18 at the bottom of the motor, and then flows to the outside of the motor through the oil outlet 17 at one or both ends of the oil collecting groove 18, and then takes away the heat in the motor. The design is to prevent a lot of oil inside the motor, resulting in oil churning loss.

In one embodiment, the end of the stretched water channel is sealed by aluminum ring welding. When the shell 5 is cast, in order to facilitate the casting of the structure of the shell 5, as shown in FIG. 6, the stretch in the shell 5 The water channel runs through the two ends of the shell 5, so aluminum rings are welded and sealed at both ends of the shell 5 to prevent water from flowing out of the two ends of the shell 5.

In a preferred embodiment, the stretching water channel surrounds the shell 5 and is distributed in a circle in the shell 5. This design is convenient for the water to take away the heat from the shell 5 more, and the stretching water channel is a continuous S-shaped Or a labyrinth type, of course, the stretched water channel can also have other continuous shapes, the purpose of which is to uniformly dissipate heat from the housing 5. As shown in FIG. 6, preferably, the bottom of the oil collecting tank 18 is inclined, and one end is provided with a connecting water channel to ensure that the continuous S-shaped or labyrinth-shaped stretched water channels on both sides of the oil collecting tank 18 can be connected.

In one embodiment, the housing 5 or the front end cover 1 or the rear end cover 9 is provided with an oil drain port. The drain port is designed to drain the oil in the motor through the drain port when the motor is disassembled.

In an embodiment, the water inlet 6-1 and the water outlet 6-2 may be arranged on the same side of the outer peripheral wall of the housing 5, or may be respectively arranged on two side ends, and the water inlet 6-1 and the water outlet 6-1 The position of the mouth 6-2 can be adjusted as needed.

In summary, this application provides a hybrid cooling motor. The motor includes a housing, a stator core, a front end cover, a rear end cover, a cooling water path, and a cooling oil path; the cooling water path includes a water inlet, a water outlet, and a stretched water channel; The water nozzle and the water outlet are arranged on the outer peripheral wall of the shell, and the stretched water channels are distributed in the shell. The cooling water channel functions to take away the heat from the back of the stator core; the cooling oil circuit includes the oil inlet, the oil inlet and the oil outlet; The port is arranged on the outer peripheral wall of the upper part of the casing, and the oil inlet groove is arranged below the oil inlet and extends in the axial direction inside the casing. Both ends are defined by the front end cover and the rear end cover. Connected, the oil outlet is arranged at the lower part of the front end cover and/or the rear end cover, and the cooling oil path is used to take away the heat in the motor and lubricate the bearing. On the one hand, the hybrid cooling motor of the present application can take away the heat from the back of the stator core during the water circulation process by providing a cooling water circuit in the motor housing; The cooling of the winding, and the oil-liquid-oil cooling oil path enters the motor, and at the same time plays a role of cooling and lubricating the bearing; the hybrid cooling motor in this application has a compact structure, small volume, good cooling performance, and high performance density; The oil drain hole is set to facilitate the motor's oil drain maintenance.

The above are only specific implementations of this application, but the protection scope of this application is not limited to this. Any person skilled in the art can easily think of changes, substitutions or improvements within the technical scope disclosed in this application. , Should be covered in the scope of protection of this application.

In the instructions provided here, a lot of specific details are explained. However, it can be understood that the embodiments of the present application can be practiced without these specific details. In some instances, well-known methods, structures, and technologies are not shown in detail, so as not to obscure the understanding of this specification.

Claims

A hybrid cooling motor, characterized in that the motor includes a housing, a stator core, a front end cover, a rear end cover, a cooling water circuit and a cooling oil circuit;

The cooling water path includes a water inlet, a water outlet, and a stretched water channel; the water inlet and the water outlet are arranged on the outer peripheral wall of the housing, the stretched water channel is distributed in the housing, and the cooling The function of the water circuit is to take away the heat from the back of the stator core;

The cooling oil passage includes an oil inlet, a cooling oil passage, and an oil outlet; the oil inlet is arranged on the outer peripheral wall of the upper part of the housing, and the oil inlet is connected to the motor through the cooling oil passage. Internal communication, the oil outlet is arranged at the lower part of the front end cover and/or the rear end cover, and the cooling oil passage functions to take away heat in the motor and lubricate the bearings.
The hybrid cooling motor according to claim 1, wherein the cooling oil passage comprises an oil inlet groove, the oil inlet groove is arranged in the upper part of the casing and extends in the axial direction inside the casing, Both ends are defined by the front end cover and the rear end cover, and the oil inlet groove is communicated with the inside of the motor through an oil passage;

The bottoms of the two ends of the oil inlet groove are respectively provided with a first oil outlet hole and a second oil outlet hole. Stator winding.
The hybrid cooling motor of claim 2, wherein the bottoms of the first oil outlet hole and the second oil outlet hole are respectively provided with a first oil separating ring and a second oil separating ring, and the first oil separating ring A first fuel injection nozzle group and a second fuel injection nozzle group are respectively provided on the first oil separator ring and the second oil separator ring.
The hybrid cooling motor of claim 3, wherein the first oil divider ring is fixed to the housing or the front end cover by a fixing screw and a T-shaped wedge, and the second oil divider ring passes through The fixing screw and the T-shaped wedge are fixed to the housing or the rear end cover.
The hybrid cooling motor of claim 4, wherein the fixing screw and the housing or the front end cover or the rear end cover are sealed by a copper gasket.
The hybrid cooling motor according to claim 1, wherein the cooling oil circuit further comprises an oil collecting groove provided at the bottom of the casing, and at least one end of the oil collecting groove is located corresponding to the oil outlet.
The hybrid cooling motor according to any one of claims 1 to 6, wherein the part of the stretched water channel at the end of the housing is sealed by an aluminum ring.
The hybrid cooling motor according to any one of claims 1 to 6, wherein the stretching water channel is distributed in a circle in the housing, and the stretching water channel is a continuous S-shaped or labyrinth-shaped.
The hybrid cooling motor according to any one of claims 1 to 6, characterized in that the housing, the front end cover or the rear end cover is provided with an oil drain.
The hybrid cooling motor according to claim 1, wherein the water inlet and the water outlet are arranged on the same side of the outer peripheral wall of the casing or arranged at an interval of 180 degrees.