CN214069749U

CN214069749U - Oil cooling structure of motor rotor

Info

Publication number: CN214069749U
Application number: CN202022575030.9U
Authority: CN
Inventors: 姜华; 吴进; 李育; 庞振华
Original assignee: Shanghai Automobile Gear Works
Current assignee: Shanghai Automobile Gear Works
Priority date: 2020-11-10
Filing date: 2020-11-10
Publication date: 2021-08-27
Anticipated expiration: 2030-11-10

Abstract

An electric machine rotor oil cooling structure comprising: hollow motor shaft, rotor core and rotary transformer to and the symmetry sets up in proper order in dynamic balance board, bearing and the oil blanket at rotor core both ends, wherein: the rotor core is arranged outside the motor shaft, and the rotary transformer is arranged outside the oil seal on one side of the rotor core; the motor shaft is provided with a plurality of oil throwing holes which are symmetrically distributed in the circumferential direction, and the oil throwing holes respectively correspond to the end surface of the bearing or the rotor core. The rotor shaft cooling structure of the utility model is simple, and no additional oil line structures such as oil pipes are needed; the oil cooling effect is not influenced by the change of the running state of the whole vehicle, the cooling is uniform, and the lubrication and cooling uniformity of the bearing is particularly improved; the problem of insufficient cooling of the rotor iron core is solved, and the risk of demagnetization of the rotor magnetic steel is reduced; the oil thrown from the two sides of the rotor core and the bearing improves the temperature distribution of the inner side of the stator end winding; the non-shaft extension end rotary transformer and the cooling oil are completely separated, so that the requirement of the cooling oil on the oil resistance of the rotary transformer material is lowered, and the rotary transformer cost is lowered.

Description

Oil cooling structure of motor rotor

Technical Field

The utility model relates to a technique in motor field specifically is a motor rotor oil cooling structure.

Background

With the continuous upgrading of new energy automobile technology, the new energy automobile has higher and higher requirements on the rotating speed of a driving motor, the highest rotating speed reaches 20000rpm/min, the power density and the torque density are higher and higher, the volume of the motor is smaller and smaller, and thus, the cooling conditions of the motor are more and more rigorous. At present, an oil-cooled motor on the market generally adopts indirect splashing cooling to a rotor core, and does not directly adopt oil-cooled cooling to the rotor core, so that the cooling effect of a rotor is poor. For the front and rear bearings, the extra oil pipe is usually used for cooling, and the cooling effect of the oil pipe arrangement is easily influenced by the change of the spray cooling area of the oil pipe under the condition of the whole vehicle, such as a flat road, an ascending slope and a descending slope, so that the service life of the bearings is shortened due to uneven temperature and uneven lubrication.

The existing oil-cooled motor structure is generally provided with front end cover oil storage chambers at two ends of a rotating shaft, but the similar structure can not solve the cooling problem of a front bearing and a rear bearing of a rotor and can not directly contact and cool the middle part of the rotor iron core with high temperature, and the cooling effect is poor.

SUMMERY OF THE UTILITY MODEL

The utility model discloses it is not enough to the above-mentioned that prior art exists, provides a motor rotor oil cooling structure, through trompil on the rotor hollow shaft, centrifugal force when utilizing the rotor rotation throws away the oil content multichannel in the hollow shaft, recycles the cavity cooling bearing that the structure formed, has both got rid of extra cooling oil pipe structure, has improved the cooling effect again.

The utility model discloses a realize through following technical scheme:

the utility model discloses a: hollow motor shaft, rotor core and rotary transformer to and the symmetry sets up in proper order in dynamic balance board, bearing and the oil blanket at rotor core both ends, wherein: the rotor core is arranged outside a motor shaft, the rotary transformer is arranged outside an oil seal on one side of the rotor core, and the motor is typically characterized in that the front bearing and the rear bearing are respectively provided with the oil seal to form an oil cavity, and the rotor core and the shaft form an oil guide groove.

The motor shaft is provided with a plurality of oil throwing holes which are symmetrically distributed in the circumferential direction, and the oil throwing holes respectively correspond to the end surface of the bearing or the rotor core.

The rotor core is characterized in that axial oil guide grooves are formed in the circumferential surface of the inner aperture of the rotor core, and the axial oil guide grooves are four oil guide grooves which are symmetrically distributed in the circumferential direction and are located on the inner diameter of the rotor punching sheet.

And the dynamic balance plate is provided with a radial oil groove.

Technical effects

Compared with the prior art, the rotor shaft cooling structure of the utility model is simple, and no additional oil line structures such as oil pipes are needed; the oil cooling effect is not influenced by the change of the running state of the whole vehicle, and the cooling is uniform, so that the lubrication and cooling uniformity of the bearing is particularly improved, and the service life of the bearing is prolonged; the problem of insufficient cooling of the middle part of the rotor iron core is solved, and the risk of demagnetization of rotor magnetic steel is reduced; meanwhile, the temperature distribution of the inner side of the stator end winding is improved by the oil thrown from the dynamic balance plates on the two sides of the rotor iron core and the bearings; the non-shaft extension end rotary transformer and the cooling oil are completely separated, so that the requirement of the cooling oil on the oil resistance of the rotary transformer material is lowered, and the rotary transformer cost is lowered.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the structure of the axial oil groove of the rotor core;

FIG. 3 is a schematic structural view of a radial oil groove of the dynamic balance plate;

in the figure: the motor shaft comprises a motor shaft 1, a shaft extension end cover 2, a shaft extension end dynamic balance plate 3, a shaft extension end dynamic balance plate radial oil groove 4, a rotor core 5, a non-shaft extension end dynamic balance plate radial oil groove 6, a non-shaft extension end dynamic balance plate 7, a non-shaft extension end cover 8, a rotary transformer 9, a non-shaft extension end oil seal 10, a motor shaft non-shaft end bearing oil throwing hole 11, a non-shaft extension end bearing 12, a motor shaft core section oil throwing hole 13, a rotor core axial oil guide groove 14, a shaft extension end bearing 15, a motor shaft end bearing oil throwing hole 16 and a shaft extension end oil seal 17.

Detailed Description

As shown in fig. 1, the present embodiment includes: motor shaft 1, rotor core 5, change 9 soon, the axle stretches end dynamic balance board 3, the non-axle stretches end dynamic balance board 7, the axle stretches end oil blanket 17, the non-axle stretches end oil blanket 10, the axle stretches end bearing 15, the non-axle stretches end bearing 12, the axle stretches end cover 2 and the non-axle stretches end cover 8, wherein: rotor core 5 sets up outside motor shaft 1, the axle is stretched and is held dynamic balance board 3, the axle is stretched end bearing 15 and the axle is stretched end oil blanket 17 and set gradually in rotor core 5's one end, non-axle is stretched and is held dynamic balance board 7, non-axle is stretched end bearing 12, non-axle is stretched end oil blanket 10 and is become 9 and set gradually in rotor core's the other end, axle is stretched end cover 2 and is located axle and stretch end bearing 15 and axle and stretch out end oil blanket 17 outside, non-axle is stretched end cover 8 and is located non-axle and stretch end bearing 12, non-axle is stretched end oil blanket 10 and become 9 outside.

The motor shaft 1 be the hollow shaft and be equipped with the passageway that is used for the pivot centrifugation to throw away oil, this passageway specifically is motor shaft non-axle head bearing department throws oilhole 11, motor shaft iron core section throws oilhole 13 and motor shaft axle head bearing department and throws oilhole 16, wherein: the oil throwing hole 11 at the non-shaft end bearing of the motor shaft is positioned at the end surface of the non-shaft extension end bearing 12, the oil throwing hole 13 at the core section of the motor shaft is positioned at the middle position of the rotor core 5, and the oil throwing hole 16 at the shaft end bearing of the motor shaft is positioned at the end surface of the shaft extension end bearing 15.

The oil throwing holes are four circular, square or rectangular through holes symmetrically distributed on the circumference direction of the motor shaft 1.

As shown in fig. 2, an axial oil guiding groove 14 is provided on the inner bore circumferential surface of the rotor core 5.

The axial oil guide grooves 14 are four oil guide grooves which are circumferentially and symmetrically distributed and are located on the inner diameter of the rotor sheet.

As shown in fig. 3, the shaft extension end and the non-shaft extension end have the same structure, and the dynamic balance plate 3 and the dynamic balance plate 7 are provided with a radial oil groove 4 and a radial oil groove 6 at the inner side of the rotor core 5.

The radial oil grooves 16 and 11 are N oil guide grooves (N is 2, 3, 4) symmetrically distributed in the circumferential direction on the shaft.

The non-shaft-extension end bearing 12 and the shaft-extension end bearing 15 are open oil lubrication bearings so that oil thrown out of the shaft bearings is thrown out of a motor cavity through the bearings.

When the rotor rotates, the oil in the motor shaft 1 is thrown out from the oil throwing hole on the motor shaft 1 by three paths under the action of centrifugal force. The first path is guided into a cavity between a shaft extension end bearing 15 and a shaft extension end oil seal 17 through an oil throwing hole 16 at the shaft end bearing of the motor shaft, and then is thrown out through a gap between balls of the shaft extension end bearing 15, and further is centrifugally thrown onto an inner side winding at the end part of a stator winding; the second path is thrown to an axial oil guide groove 14 of the rotor core through an oil throwing hole 13 of the motor shaft core section, and then is thrown out of a radial oil groove 4 and a radial oil groove 6 of the dynamic balance plate corresponding to the dynamic balance plate 3 at the shaft extension end and the dynamic balance plate 7 at the non-shaft extension end, and further thrown to an inner side winding at the end part of the stator winding; the third path is guided into a cavity between the non-shaft-extension end bearing 12 and the non-shaft-extension end oil seal 10 through an oil throwing hole 11 at the non-shaft-extension end bearing 12 of the motor shaft, and then thrown out through a gap between bearing balls, and further centrifugally thrown onto an inner side winding of the end part of the stator winding.

The foregoing embodiments may be modified in various ways by those skilled in the art without departing from the spirit and scope of the present invention, which is not limited by the above embodiments but is to be accorded the full scope defined by the appended claims, and all such modifications and variations are within the scope of the invention.

Claims

1. An electric motor rotor oil cooling structure characterized by comprising: hollow motor shaft, rotor core and rotary transformer to and the symmetry sets up in proper order in dynamic balance board, bearing and the oil blanket at rotor core both ends, wherein: the rotor core is arranged outside the motor shaft, and the rotary transformer is arranged outside the oil seal on one side of the rotor core;

2. The oil cooling structure of the motor rotor as claimed in claim 1, wherein an axial oil guiding groove is formed on the circumferential surface of the inner bore of the rotor core.

3. The oil cooling structure of the motor rotor as claimed in claim 2, wherein the axial oil guiding grooves are four oil guiding grooves symmetrically distributed on the circumference and located on the inner diameter of the rotor punching sheet.

4. The electric motor rotor oil cooling structure of claim 1, wherein said dynamic balance plate is provided with radial oil grooves.

5. The motor rotor oil cooling structure of claim 4, wherein said radial oil grooves are axially symmetrically distributed in a circumferential direction.

6. The electric motor rotor oil cooling structure of claim 1, wherein said bearing is an open oil lubricated bearing.

7. The oil cooling structure for the motor rotor as claimed in claim 1, wherein the oil slinger holes are four circular, square or rectangular through holes symmetrically distributed in the circumferential direction of the motor shaft.

8. The oil cooling structure of the motor rotor as claimed in any one of claims 1 to 7, comprising: motor shaft, rotor core, change soon, the axle is stretched and is held dynamic balance board, non-axle is stretched and hold dynamic balance board, axle is stretched end oil blanket, non-axle is stretched end oil blanket, axle is stretched end bearing, non-axle and is stretched end bearing, axle and stretch end cover and non-axle and stretch end cover, wherein: rotor core sets up outside the motor shaft, and the axle is stretched and is held dynamic balance board, axle and stretch end bearing and axle and stretch the end oil blanket and set gradually in rotor core's one end, and non-axle is stretched and is held dynamic balance board, non-axle and stretch end bearing, non-axle and stretch end oil blanket and become to set gradually in rotor core's the other end, and the axle is stretched the end cover and is located the axle and stretch the end bearing and the axle is stretched and is held the oil blanket outside, and non-axle is stretched the end cover and is located non-axle and stretch end bearing, non-axle and stretch end oil blanket and become to the outside soon.