CN115425793A - An oil-cooled motor - Google Patents

Abstract

The invention discloses an oil-cooled motor which comprises a shell, a front end cover and a rear end cover, wherein the front end cover and the rear end cover are arranged at two ends of the shell, a rotating shaft is arranged in the shell through a bearing, a plurality of groups of rotor cores are arranged around the rotating shaft, a stator core is arranged around the rotor cores, and windings are arranged on the stator cores. The application provides a highly integrated, retrench part kind and reduce the oil-cooled motor of the assembly degree of difficulty.

Description

An oil-cooled motor

technical field

The invention relates to the technical field of automobile motors, in particular to an oil-cooled motor.

Background technique

With the development of new energy vehicles, the market demand for new energy vehicle drive system performance is also increasing. As one of the core components of the drive system, automotive motors are developing towards high power density and high torque density. Traditional water-cooled motors usually open a water channel on the motor casing and indirectly cool the motor by cooling the casing. The cooling efficiency is not high; the current of automobile motors is getting larger and faster, and the traditional indirect water cooling has been It is difficult to meet the heat dissipation requirements of the car motor. Oil has the characteristics of non-magnetic and non-conductive, so direct oil cooling technology has become the mainstream technology for motor cooling at present. There are two main schemes for cooling the stator of oil-cooled motors: one is the plastic oil injection pipe structure, and the oil injection The tube is used as a separate part to spray and cool the winding end; the other is the oil injection ring structure, and the oil injection ring is assembled with other parts as a separate part to form an oil injection cavity to spray and cool the winding end. The parts types of these two schemes Many, difficult to assemble.

Contents of the invention

In order to solve the deficiencies of the prior art, the application provides an oil-cooled motor, including:

The housing has an installation cavity inside;

An end cover, including a front end cover and a rear end cover, the front end cover and the rear end cover are respectively connected to two ends of the housing;

The rotating shaft is installed in the installation cavity of the housing through bearings;

a rotor, including multiple sets of rotor cores arranged around the rotating shaft;

The stator includes a stator core arranged around the outer side of the rotor core, and a winding is also arranged on the stator core;

Wherein, an oil inlet is opened on the housing, an oil outlet is opened on the front end cover and the rear end cover, and the front end cover and the rear end cover respectively have first installation cavities for installing the structures at both ends of the winding. chamber and the second installation chamber, a first oil chamber is jointly formed between the front end cover, the casing and the stator core, and a first oil injection chamber is opened on the side wall of the first oil chamber The hole is aligned with one end of the winding, and a second oil chamber is jointly formed between the rear end cover, the casing and the stator core, and a second oil chamber is opened on the side wall of the second oil chamber. The oil injection hole is aligned with the other end of the winding, and the first oil chamber and the second oil chamber communicate through an oil passage opened on the stator core, and the oil inlet communicates with the second oil chamber. An oil chamber, the oil outlet on the front end cover and the oil outlet on the rear end cover communicate with the first installation chamber and the second installation chamber respectively.

Further, an oil chamber wall is formed on the front end cover and the rear end cover, and the free end of the oil chamber wall is in contact with the stator core, wherein the two sides of the oil chamber wall of the front end cover are respectively The first oil chamber and the first installation chamber, the two sides of the oil chamber wall of the rear end cover are respectively the second oil chamber and the second installation chamber, and the first oil injection hole The second oil injection hole is opened on the oil chamber wall of the rear end cover.

Further, the wall of the oil chamber includes a first horizontal section, an inclined section and a second horizontal section, the first horizontal section is connected to the housing, one end of the inclined section is connected to the first horizontal section, and the other end is connected to the A second horizontal section, the other end of which is connected to the stator core.

Further, the first oil injection hole is opened on the inclined section of the oil chamber wall of the front end cover and the second horizontal section, and is opened on the inclined section of the oil chamber wall of the rear end cover and on the second horizontal section. The second oil injection hole.

Further, the opening directions of the first oil injection hole and the second oil injection hole are perpendicular to the direction of the end surface where they are located, so that the oil can cool the winding from different directions.

Further, a sealing ring is provided at the connection between the oil chamber wall and the stator core.

Further, the oil passages include multiple groups and are arranged at intervals, and each group of oil passages is located along the edge of the stator core and runs through both ends of the stator core.

Further, both the first installation chamber and the second installation chamber are provided with bearing chambers for installing bearings to realize the assembly of the end cover and the rotating shaft.

The benefit of this application lies in that the provided oil-cooled motor uses the motor end cover and housing to set the oil chamber and oil injection hole, simplifying the types of parts, reducing the difficulty of assembly, and cooling the winding and stator core at the same time , improve the cooling capacity of the motor.

Description of drawings

Fig. 1 is a schematic structural diagram of an embodiment of an oil-cooled motor of the present application;

Fig. 2 is a structural schematic diagram of another viewing angle in Fig. 1;

Fig. 3 is A-A sectional view among Fig. 2;

Fig. 4 is a partial structural schematic diagram in Fig. 1;

Fig. 5 is a schematic diagram of the structure of the front end cover in Fig. 1;

FIG. 6 is a schematic structural diagram of a second viewing angle in FIG. 5;

FIG. 7 is a schematic structural diagram of a third viewing angle in FIG. 5 .

Marked in the figure are: 10, housing, 101, oil inlet, 11, front end cover, 111, main body seat, 1111, installation hole, 112, oil chamber wall, 1121, first oil injection hole, 1122, first level Section, 1123, inclined section, 1124, second horizontal section, 1125, mounting groove, 113, bearing chamber, 114, boss, 1141, threaded hole, 115, installation space, 116, front oil outlet, 12, rear end Cover, 121, rear oil outlet, 13, rotating shaft, 14, rotor iron core, 15, stator iron core, 151, oil passage, 16, winding, 17, first oil chamber, 18, sealing ring.

detailed description

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Referring to Figures 1-7, this embodiment provides an oil-cooled motor, including a housing 10 with an installation cavity, and the two ends of the housing 10 are respectively provided with a front end cover 11 and a rear end cover 12, wherein the front end cover 11 and the rear end cover 12 The rear end cover 12 has the same structure and has an installation chamber. A rotating shaft 13 is also arranged in the housing 10. A rotor is arranged on the rotating shaft 13. A stator is arranged outside the rotor. The rotor includes multiple sets of rotor cores 14 arranged around the rotating shaft. It includes multiple sets of stator cores 15 set around the rotor core 14, and windings 16 are arranged on the stator cores 15, and the two ends of the windings protrude from the stator cores and are respectively arranged in the installation chambers of the front end cover and the rear end cover .

Specifically, the casing 10 is provided with an oil inlet 101, the front end cover 11 and the rear end cover 12 respectively have a first installation chamber and a second installation chamber for installing the structures at both ends of the winding, and the front end cover is provided with a front An oil outlet 116, a rear oil outlet 121 is provided on the rear end cover 12, a first oil chamber 17 is jointly formed between the front end cover 11, the casing 10 and one end of the stator core 15, and the side of the first oil chamber A plurality of first oil injection holes 1121 are opened on the wall to align with one end of the winding 16, and a second oil chamber is jointly formed between the rear end cover, the casing and the other end of the stator core, and the side wall of the second oil chamber The second oil injection hole is set on the top to align with the other end of the winding, the first oil chamber and the second oil chamber communicate through the oil passage 151 opened on the stator core, and the oil inlet 101 communicates with the first oil chamber 17. The front oil outlet 102 communicates with the first installation chamber, and the rear oil outlet 121 communicates with the second installation chamber.

Since the front end cover 11 and the rear end cover 12 have the same structure, the front end cover 11 is used as an example here for illustration. An oil chamber wall 112 is formed, and the oil chamber wall 112 is arranged around the edge of the main body seat 111. The space between the inner side of the oil chamber wall 112 and the main body seat 111 is the first installation chamber, and the outer side of the oil chamber wall and the main body seat are formed. There is an installation space 115 for installation with the housing, the free end of the oil chamber wall 112 is in contact with the stator core 15, and the two sides of the oil chamber wall are respectively the first oil chamber 17 and the first installation chamber.

Preferably, the oil chamber wall 112 includes a first horizontal section 1122 , an inclined section 1123 and a second horizontal section 1124 , one end of the first horizontal section 1122 is fixedly connected to the main body seat 10 , and the end surface of the first horizontal section 1122 is used for connecting with the casing 10, one end of the inclined section 1123 is connected to the other end of the first horizontal section 1122, and the other end of the inclined section 1123 is inclined to the installation hole direction and connected to the second horizontal section 1124. Both the inclined section 1123 and the second horizontal section 1124 are provided with The opening direction of the oil injection hole 1121 is perpendicular to the direction of the end surface where the oil injection hole 1121 is located, and the first horizontal section 1122 and the second horizontal section 1124 are arranged in parallel.

More specifically, the area between the end of the first horizontal section 1122 and the edge of the main body seat 111 is the installation space 115, and the installation area 115 is used for sealing connection with the end wall of the motor housing.

Preferably, the free end of the second horizontal section 114 is further provided with an annular installation groove 1125 , and the sealing ring 18 is arranged in the installation groove 1125 .

In addition, a bearing chamber 113 is also provided in the installation chamber. The bearing chamber 113 is arranged around the edge of the installation hole 1111. Bearings are arranged in the bearing chamber 113. The two ends of the rotating shaft 13 are assembled through the bearings, and the oil chamber wall is arranged on the edge of the overall main body seat. At the position, as long as the edge position of the main body seat 111 leaves a space for assembling with the motor housing, four groups of bosses 114 are arranged at intervals in the peripheral direction of the body seat, threaded holes 1141 are provided on the bosses 114, and the front end cover is connected by bolts and Shell assembly.

Working principle: oil enters the first oil chamber 17 from the oil inlet 101, a part of the oil is sprayed out from the first oil injection hole 1121 to cool one end of the winding, and a part of the oil passes through the oil passage 151 on the stator core It enters the second oil chamber, sprays out through the second oil injection hole, and cools the other end of the winding. When the oil passes through the oil passage, it cools the stator core at the same time. The oil port 116 and the rear oil outlet 121 are discharged and recycled. It should be noted that the positions of the front oil outlet 116 and the rear oil outlet 121 are only schematic diagrams. During installation, the front oil outlet 116 and the rear oil outlet Port 121 should be below the whole motor to facilitate oil discharge.

Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments, or perform equivalent replacements for some of the technical features. Within the spirit and principles of the present invention, any modifications, equivalent replacements, improvements, etc., shall be included in the protection scope of the present invention.

Claims (8)

1. An oil-cooled electric machine, comprising:

a housing having a mounting cavity therein;

the end covers comprise a front end cover and a rear end cover, and the front end cover and the rear end cover are respectively connected to two ends of the shell;

the rotating shaft is arranged in the mounting cavity of the shell through a bearing;

the rotor comprises a plurality of groups of rotor iron cores arranged around the rotating shaft;

the stator comprises a stator core arranged around the outer side of the rotor core, and a winding is further arranged on the stator core;

the stator core is provided with a front end cover, a rear end cover and a stator core, wherein the front end cover and the rear end cover are respectively provided with a first installation cavity and a second installation cavity, the first installation cavity and the second installation cavity are used for installing two-end structures of the winding, a first oil cavity is formed among the front end cover, the casing and the stator core, a first oil injection hole is formed in the side wall of the first oil cavity and aligned with one end of the winding, a second oil cavity is formed among the rear end cover, the casing and the stator core, a second oil injection hole is formed in the side wall of the second oil cavity and aligned with the other end of the winding, the first oil cavity and the second oil cavity are communicated through an oil duct formed in the stator core, the oil inlet is communicated with the first oil cavity, and the oil outlet in the front end cover and the oil outlet in the rear end cover are respectively communicated with the first installation cavity and the second installation cavity.

2. An oil cooled electric machine according to claim 1, characterized in that: the front end cover and the rear end cover are both provided with oil cavity walls, the free ends of the oil cavity walls are abutted to the stator core, the first oil cavity and the first installation cavity are respectively arranged on two sides of the oil cavity wall of the front end cover, the second oil cavity and the second installation cavity are respectively arranged on two sides of the oil cavity wall of the rear end cover, the first oil injection hole is formed in the oil cavity wall of the front end cover, and the second oil injection hole is formed in the oil cavity wall of the rear end cover.

3. An oil-cooled machine according to claim 2, characterized in that: the oil cavity wall comprises a first horizontal section, an inclined section and a second horizontal section, the first horizontal section is connected with the shell, one end of the inclined section is connected with the first horizontal section, the other end of the inclined section is connected with the second horizontal section, and the other end of the second horizontal section is connected to the stator core.

4. An oil cooled electric machine according to claim 3, characterized in that: the inclined section and the second horizontal section of the oil cavity wall of the front end cover are provided with the first oil injection holes, and the inclined section and the second horizontal section of the oil cavity wall of the rear end cover are provided with the second oil injection holes.

5. An oil-cooled machine according to claim 4, characterized in that: the first oil spout hole with the direction of seting up of second oil spout hole all is perpendicular with the terminal surface direction at its place.

6. An oil cooled electric machine according to claim 2, characterized in that: and a sealing ring is arranged at the joint of the oil cavity wall and the stator core.

7. An oil-cooled machine according to claim 3, characterized in that: the oil ducts comprise a plurality of groups and are arranged at intervals, and each group of oil ducts are arranged along the edge of the stator core and penetrate through two ends of the stator core.

8. The oil-cooled electric machine of claim 1, wherein: and bearing chambers are arranged in the first mounting chamber and the second mounting chamber.

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