An oil-cooled motor structure

Abstract

The present invention relates to the technical field of motor cooling, and particularly to an oil-cooled motor structure. It includes a housing, and an oil storage cavity is arranged outside the housing. The oil inlet is divided into a front end of a larger oil cavity oil inlet and a rear end of a smaller oil cavity oil inlet respectively through a baffle; an oil distribution hole is arranged in the oil storage cavity to cool the winding; a bearing cooling oil passage is arranged to cool the bearing; and an annular spray oil passage is arranged to further cool the stator and the rotor. The present invention proposes to divide the oil storage cavity into two front and rear oil storage cavities through a baffle, so as to control the amount of cooling oil, making the amount of cooling oil for the cooling winding outlet end more than that for the non-outlet end; through the settings of oil passages such as the annular spray oil passage, the bearing cooling oil passage, and the oil distribution hole, the comprehensive and uniform cooling of the bearing, winding, stator, and rotor of the motor is completely realized, ensuring the reliable operation of the motor.

Description

Technical Field

[0001] The invention relates to the technical field of motor cooling, and in particular to an oil-cooled motor structure. Background Art

[0002] The drive motor will generate a lot of heat when it is running continuously. If the motor temperature is too high, it will affect the reliability and power performance of the motor. In order to maintain the normal operation of the motor, a reasonable cooling structure needs to be designed to cool the motor.

[0003] At present, the most commonly used cooling method is water cooling. However, as the motor power increases, the effect of water cooling can no longer meet the heat dissipation requirements of the motor. Oil is not conductive, so the cooling oil can directly contact the motor components and directly take away the heat of the motor components. Therefore, the cooling effect of the oil cooling system is much better than that of water cooling, and it has become the development trend of the motor cooling system.

[0004] Existing oil-cooled motors generally use oil pipes for oil spray cooling. The cooling oil is transported to the oil pipes, and then the oil is sprayed from the oil spray holes on the oil pipes to spray the oil onto the motor windings and other components for cooling. This cooling method requires the design and installation of additional oil pipes, so the structure is relatively complex, the installation process is difficult, and the reliability is low; and the use of oil pipes for oil spraying can generally only spray the cooling oil onto the surface of the motor components, and the cooling effect is not good. In addition, the outlet end of the stator winding is generally longer than the non-outlet end, which will cause the outlet end of the winding to require more cooling oil than the non-outlet end. However, the existing motor oil cooling technology generally uses the same amount of cooling oil to cool the two ends of the motor winding, so there will be a problem of uneven cooling at both ends of the winding: the cooling effect of the outlet end is not as good as the cooling effect of the non-outlet end. Summary of the invention

[0005] The object of the present invention is to provide an oil-cooled motor structure, which uses an oil storage cavity and a cooling oil channel to cool the motor instead of the cooling oil pipe in the prior art, so as to solve the problems in the prior art that the oil pipe is used for cooling, such as complex structure, difficult installation process, low reliability and poor cooling result. The proposed motor oil cooling structure can also divide the oil storage cavity into two front and rear oil storage cavities by a baffle, so as to control the cooling oil amount, so that the cooling oil amount of the cooling winding outlet end is more than the cooling oil amount of the cooling non-outlet end, so as to solve the problem of uneven cooling of the winding outlet end and the non-outlet end in the existing oil cooling technology.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] The present invention provides an oil-cooled motor structure, which includes a housing. Front end covers and rear end covers are respectively provided at the front and rear ends of the housing. A rotor assembly and a stator assembly are provided inside the housing. The rotor assembly includes a rotating shaft. The front and rear ends of the rotating shaft are respectively rotatably connected to the housing through a front bearing and a rear bearing. A rotor core is further installed outside the rotating shaft, and a plurality of V-shaped permanent magnet groups are installed inside the rotor core. Each V-shaped permanent magnet group is composed of two permanent magnets distributed in a V shape. Front and rear rotor pressing plates are further installed at the front and rear ends of the rotor core. The stator assembly includes a stator core, and the stator core is fixedly installed on the circumferential side wall inside the housing. Windings are further installed on the stator core. The windings located at the front end part of the stator core are front outgoing end windings, and the windings located at the rear end part of the stator core are rear non-outgoing end windings.

[0008] An oil storage cavity is arranged outside the housing, and a baffle is arranged at the middle position of the oil storage cavity to divide the oil storage cavity into a front oil storage cavity and a rear oil storage cavity which are symmetrically distributed.

[0009] An oil inlet is further arranged on one side of the oil storage cavity.

[0010] A front oil distribution hole and a front bearing oil distribution hole are arranged inside the front oil storage cavity. A rear oil distribution hole and a rear bearing oil distribution hole are arranged inside the rear oil storage cavity.

[0011] Front bearing cooling oil channels and rear bearing cooling oil channels are respectively arranged inside the front end cover and the rear end cover. One ends of the front bearing cooling oil channel and the rear bearing cooling oil channel are respectively communicated with the front bearing oil distribution hole and the rear bearing oil distribution hole. The other ends of the front bearing cooling oil channel and the rear bearing cooling oil channel are respectively connected with the front bearing and the rear bearing.

[0012] Further, the oil inlet is divided into two parts by the baffle: the front end of the oil cavity oil inlet and the rear end of the oil cavity oil inlet, and the area of the front end of the oil cavity oil inlet is larger than that of the rear end of the oil cavity oil inlet.

[0013] Further, the bottoms of the front oil distribution hole and the rear oil distribution hole are respectively located above the front outgoing end winding and the rear non-outgoing end winding, and are used to pour the cooling oil entering the front oil distribution hole and the rear oil distribution hole onto the front outgoing end winding and the rear non-outgoing end winding.

[0014] Further, a front annular spray oil channel and a rear annular spray oil channel are respectively arranged on the front end cover and the rear end cover.

[0015] The front annular spray oil channel and the rear annular spray oil channel are respectively communicated with the front bearing cooling oil channel and the rear bearing cooling oil channel.

[0016] Moreover, a plurality of spray holes facing the windings are formed in both the front annular spray oil passage and the rear annular spray oil passage.

[0017] Furthermore, a plurality of rotor cooling oil holes are provided inside the rotor core; and through holes are also provided at positions corresponding to the rotor cooling oil holes on the front rotor pressing plate and the rear rotor pressing plate.

[0018] The present invention has at least the following beneficial effects:

[0019] The present invention provides an oil-cooled motor structure. Firstly, an oil storage cavity and a cooling oil passage are used to replace the cooling oil pipe in the prior art to cool the motor, solving the problems of complex structure, difficult installation process, low reliability, and poor cooling effect caused by using an oil pipe for cooling in the prior art.

[0020] The motor oil-cooling structure provided by the present invention can also divide the oil storage cavity into two front and rear oil storage cavities through a baffle, thereby controlling the amount of cooling oil, making the amount of cooling oil for cooling the winding outgoing end more than that for cooling the non-outgoing end, and solving the problem of uneven cooling of the winding outgoing end and the non-outgoing end in the existing oil-cooling technology.

[0021] Through the arrangement of oil passages such as an annular spray oil passage, a bearing cooling oil passage, and an oil distribution hole, the present invention fully realizes the comprehensive and uniform cooling of the bearings, windings, stators, and rotors of the motor, ensuring the reliable operation of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1 is a three-dimensional view of the motor structure of the present invention Figure 1 ;

[0024] Figure 2 is a three-dimensional view of the motor structure of the present invention Figure 2 ;

[0025] Figure 3 is Figure 2 a cross-sectional view of the internal structure of the motor taken along the A-A plane in

[0026] Figure 4 is a three-dimensional view of the structure of the rotor assembly;

[0027] Figure 5 is a top view of the motor structure of the present invention;

[0028] Figure 6It is a schematic structural diagram of the front end cover 2;

[0029] Figure 7 It is a schematic structural diagram of the front rotor pressure plate 7 and the rear rotor pressure plate 10.

[0030] In the figure: 1. Housing; 101. Front-end oil storage cavity; 1011. Front end of the oil cavity oil inlet; 102. Rear-end oil storage cavity; 1021. Rear end of the oil cavity oil inlet; 103. Front bearing oil distribution hole; 104. Rear bearing oil distribution hole; 105. Front-end oil distribution hole; 106. Rear-end oil distribution hole; 107. Oil inlet; 2. Front end cover; 201. Front bearing cooling oil passage; 202. Front annular spray oil passage; 2021. Oil injection hole; 3. Stator core; 4. Front outgoing end winding; 5. Rotor core; 501. Rotor cooling oil hole; 6. Rotating shaft; 7. Front rotor pressure plate; 8. Rear end cover; 801. Rear bearing cooling oil passage; 802. Rear annular spray oil passage; 9. Rear non-outgoing end winding; 10. Rear rotor pressure plate; 11. Permanent magnet; 12. Front bearing; 13. Rear bearing. Specific embodiments

[0031] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0032] Embodiment 1:

[0033] The present invention is an oil-cooled motor structure. For details, please refer to Figure 1 and Figure 2 , Figure 1 is the three-dimensional Figure 1 ; Figure 2 is the three-dimensional Figure 2 of the motor structure of the present invention.

[0034] It includes a housing 1;

[0035] A front end cover 2 and a rear end cover 8 are respectively provided at the front and rear ends of the housing 1, and a rotor assembly and a stator assembly are provided inside the housing;

[0036] Referring to Figure 3 and Figure 4 , Figure 3 is Figure 2 A cross-sectional view of the internal structure of the motor at the A-A plane in Figure 4 is a three-dimensional diagram of the structure of the rotor assembly.

[0037] The rotor assembly includes a rotating shaft 6; the front and rear ends of the rotating shaft 6 are respectively rotatably connected to the housing 1 through a front bearing 12 and a rear bearing 13;

[0038] A rotor core 5 is also installed on the outer side of the rotating shaft 6, and a plurality of V-shaped permanent magnet groups are installed inside the rotor core 5. Each V-shaped permanent magnet group is composed of two permanent magnets 11 distributed in a V shape.

[0039] Front rotor pressing plates 7 and rear rotor pressing plates 10 are also installed at the front and rear ends of the rotor core 5.

[0040] Refer to Figure 3 :

[0041] The stator assembly includes a stator core 3, and the stator core 3 is fixedly installed on the side wall inside the housing 1; windings are also installed on the stator core 3.

[0042] Among them, the winding located at the front end part of the stator core 3 is the front outgoing line end winding 4, and the winding located at the rear end part of the stator core 3 is the rear non-outgoing line end winding 9.

[0043] The above part is a common existing motor structure. This application designs a brand-new oil cooling structure for it, which is as follows:

[0044] Refer to Figure 1 and Figure 2 :

[0045] An oil storage cavity is arranged outside the housing 1, and the middle position of the oil storage cavity is divided into two symmetrical parts by a baffle: a front-end oil storage cavity 101 and a rear-end oil storage cavity 102.

[0046] Refer to Figure 5 , Figure 5 which is the top view of the motor structure of the present invention;

[0047] A front-end oil distribution hole 105 and a front bearing oil distribution hole 103 are arranged inside the front-end oil storage cavity 101; a rear-end oil distribution hole 106 and a rear bearing oil distribution hole 104 are arranged inside the rear-end oil storage cavity 102.

[0048] An oil inlet 107 is also arranged on one side of the oil storage cavity. The oil inlet 107 is divided into two parts by the baffle: a front-end oil cavity inlet 1011 and a rear-end oil cavity inlet 1021, and the area of the front-end oil cavity inlet 1011 is larger than that of the rear-end oil cavity inlet 1021.

[0049] Thus, it can be realized that the cooling oil entering the front-end oil storage cavity 101 is more than the cooling oil entering the rear-end oil storage cavity 102.

[0050] Refer to Figure 3 and Figure 6 , Figure 6 which is the structural schematic diagram of the front end cover 2:

[0051] The bottoms of the front oil distribution holes 105 and the rear oil distribution holes 106 are respectively located above the front lead-out end winding 4 and the rear non-lead-out end winding 9;

[0052] The cooling oil entering the front oil distribution holes 105 and the rear oil distribution holes 106 will directly drip onto the front lead-out end winding 4 and the rear non-lead-out end winding 9 and cool them; and since the cooling oil entering the interior of the front oil storage cavity 101 is more than the cooling oil entering the rear oil storage cavity 102, the flow rate of the cooling oil in the front oil distribution holes 105 is greater than that of the rear oil distribution holes 106, solving the problem of uneven cooling of the winding lead-out end and the non-lead-out end in the existing oil cooling technology;

[0053] The front end cover 2 and the rear end cover 8 are respectively provided with a front bearing cooling oil passage 201 and a rear bearing cooling oil passage 801 inside; and one ends of the front bearing cooling oil passage 201 and the rear bearing cooling oil passage 801 are respectively communicated with the front bearing oil distribution hole 103 and the rear bearing oil distribution hole 104; the other ends of the front bearing cooling oil passage 201 and the rear bearing cooling oil passage 801 are respectively connected to the front bearing 12 and the rear bearing 13, for guiding the cooling oil to the front bearing 12 and the rear bearing 13 to cool them.

[0054] The front end cover 2 and the rear end cover 8 are also respectively provided with a front annular spray oil passage 202 and a rear annular spray oil passage 802, and the front annular spray oil passage 202 and the rear annular spray oil passage 802 are respectively communicated with the front bearing cooling oil passage 201 and the rear bearing cooling oil passage 801;

[0055] And a plurality of spray holes 2021 facing the winding are respectively opened on the front annular spray oil passage 202 and the rear annular spray oil passage 802.

[0056] Thus, the cooling oil can be sprayed onto the front lead-out end winding 4, the rear non-lead-out end winding 9, the stator core 3, and the rotor core 5 in a spray manner to cool them.

[0057] Refer to Figure 3 、 Figure 4 and Figure 7 , Figure 7 which are schematic structural diagrams of the front rotor pressing plate 7 and the rear rotor pressing plate 10.

[0058] A plurality of rotor cooling oil holes 501 are arranged inside the rotor core 5; and through holes are also arranged on the front rotor pressing plate 7 and the rear rotor pressing plate 10 at positions corresponding to the rotor cooling oil holes 501.

[0059] Thus, a part of the cooling oil sprayed onto the rotor core 5 in the above spray manner enters the rotor cooling oil holes 501 and cools the interior of the rotor core 5, further ensuring the cooling effect.

[0060] As described above:

[0061] The cooling oil enters the oil storage cavity through the oil inlet 107. Due to the presence of the baffle, the cooling oil will be split. Part of it enters the front-end oil storage cavity 101 through the front end 1011 of the oil cavity inlet, and the other part enters the rear-end oil storage cavity 102 through the rear end 1021 of the oil cavity inlet (the amount of cooling oil entering the front-end oil storage cavity 101 is more than that entering the rear-end oil storage cavity 102).

[0062] The cooling oil entering the front-end oil storage cavity 101 will be split again. One part enters the front-end oil distribution hole 105 and directly drips onto the front outgoing-end winding 4 to cool the front-end winding 4. The other part of the cooling oil enters the front bearing oil distribution hole 103 and enters the front bearing cooling oil passage 201 in the front-end cover 2 through the front bearing oil distribution hole 103.

[0063] The cooling oil entering the bearing cooling oil passage 201 will be further split. One part of the oil directly enters the front bearing chamber at the front end to cool the front bearing 12. One part of the cooling oil enters the annular spray oil passage 202 inside the front-end cover 2 and then sprays oil through the oil spray holes 2021. Part of it sprays onto the winding end face and the outer surfaces of the stator and rotor to cool the front outgoing-end winding 44, the stator core 3, and the rotor core 5. Part of it enters the gap between the housing 1 and the stator core 3 to cool the stator 3. Additionally, part of it can enter the cooling oil hole 501 of the rotor 5 to cool the rotor components.

[0064] The cooling oil entering the rear-end oil storage cavity 102 will be split again. One part enters the rear-end oil distribution hole 106 and directly drips onto the rear non-outgoing-end winding 9 to cool the rear-end winding 9. The other part of the cooling oil enters the rear bearing oil distribution hole 104 and enters the bearing cooling oil passage 801 in the rear-end cover 8 through the rear bearing oil distribution hole 104. The cooling oil entering the bearing cooling oil passage 801 will be further split. One part of the oil directly enters the rear bearing chamber at the rear end to cool the rear bearing 13. One part of the cooling oil enters the annular spray oil passage 802 inside the rear-end cover 8 and then sprays oil through the oil spray holes. Part of it sprays onto the winding end face and the outer surfaces of the stator and rotor to cool the rear-end winding 9, the stator 3, and the rotor 5. Part of it enters the gap between the housing 1 and the stator core 3 to cool the stator 3. Additionally, part of it can enter the cooling oil hole 501 of the rotor 5 to cool the rotor components.

[0065] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and what is described in the above embodiments and the specification is only the principle of the present invention. Without departing from the spirit and scope of the present invention, various changes and improvements will occur to the present invention, and these changes and improvements fall within the scope of the present invention claimed. The scope of protection required by the present invention is defined by the appended claims and their equivalents.

Claims

1. An oil-cooled motor structure includes a housing. Front end covers and rear end covers are respectively provided at the front and rear ends of the housing. A rotor assembly and a stator assembly are provided inside the housing. The rotor assembly includes a rotating shaft. The front and rear ends of the rotating shaft are respectively rotationally connected to the housing through a front bearing and a rear bearing. A rotor core is further installed on the outer side of the rotating shaft, and a plurality of V-shaped permanent magnet groups are installed inside the rotor core. Each V-shaped permanent magnet group is composed of two permanent magnets distributed in a V shape. Front rotor pressing plates and rear rotor pressing plates are further installed at the front and rear ends of the rotor core. The stator assembly includes a stator core, and the stator core is fixedly installed on the circumferential side wall inside the housing. Windings are further installed on the stator core. The windings in the front end part of the stator core are front outgoing terminal windings, and the windings in the rear end part of the stator core are rear non-outgoing terminal windings. It is characterized in that an oil storage cavity is arranged outside the housing, and a baffle is arranged at the middle position of the oil storage cavity to divide the oil storage cavity into a front oil storage cavity and a rear oil storage cavity which are symmetrically distributed. An oil inlet is further arranged on one side of the oil storage cavity. A front oil distribution hole and a front bearing oil distribution hole are arranged inside the front oil storage cavity. A rear oil distribution hole and a rear bearing oil distribution hole are arranged inside the rear oil storage cavity. Front bearing cooling oil channels and rear bearing cooling oil channels are respectively arranged inside the front end cover and the rear end cover. One ends of the front bearing cooling oil channel and the rear bearing cooling oil channel are respectively communicated with the front bearing oil distribution hole and the rear bearing oil distribution hole. The other ends of the front bearing cooling oil channel and the rear bearing cooling oil channel are respectively connected to the front bearing and the rear bearing. The oil inlet is divided into two parts by the baffle: the front end of the oil cavity oil inlet and the rear end of the oil cavity oil inlet, and the area of the front end of the oil cavity oil inlet is larger than that of the rear end of the oil cavity oil inlet.

2. The oil-cooled motor structure according to claim 1, wherein, The bottom parts of the front oil distribution hole and the rear oil distribution hole are respectively located above the front outgoing terminal windings and the rear non-outgoing terminal windings, and are used for dripping the cooling oil entering the front oil distribution hole and the rear oil distribution hole onto the front outgoing terminal windings and the rear non-outgoing terminal windings.

3. The oil-cooled motor structure according to claim 1, characterized in that, Front annular spray oil channels and rear annular spray oil channels are respectively arranged on the front end cover and the rear end cover. The front annular spray oil channel and the rear annular spray oil channel are respectively communicated with the front bearing cooling oil channel and the rear bearing cooling oil channel. And a plurality of spray holes facing the windings are opened on both the front annular spray oil channel and the rear annular spray oil channel.

4. The oil-cooled motor structure according to claim 3, characterized in that, A plurality of rotor cooling oil holes are arranged inside the rotor core. Through holes are also arranged at the positions corresponding to the rotor cooling oil holes on the front rotor pressing plate and the rear rotor pressing plate.

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