CN-224218159-U - Motor rotor and motor

CN224218159UCN 224218159 UCN224218159 UCN 224218159UCN-224218159-U

Abstract

The application provides a motor rotor and a motor. The motor rotor comprises a rotating shaft, a rotor lamination and a first balance disc, wherein the first balance disc is arranged on one side of the rotor lamination in the axial direction and is clung to the rotor lamination, a plurality of radial oil passing grooves are formed in the mounting surface of the first balance disc, which faces the rotor lamination, two ends of each radial oil passing groove are respectively communicated with an oil guide hole of the rotating shaft and an oil passing channel of the rotor lamination, a groove is formed in the mounting surface of the first balance disc, the groove partially covers the radial outer end of each radial oil passing groove at the radial outer side of each radial oil passing groove, sealing materials are filled in the groove to form a sealing strip, or sealing strips made of sealing materials are arranged on the end face of each lamination of the rotor lamination, which faces the first balance disc, the sealing materials are arranged opposite to the groove, and the radial outer end of each radial oil passing groove is partially covered at the radial outer side of each radial oil passing groove and used for blocking cooling oil from flowing out from the radial oil passing groove to the radial outer side.

Inventors

YANG WENQUAN
MI XIUFENG
LIN QIANG
GONG WENSHENG

Assignees

舍弗勒技术股份两合公司

Dates

Publication Date: 20260508
Application Date: 20250328

Claims (10)

1. An electric motor rotor, comprising: An oil inlet cavity is formed in the rotating shaft which is at least partially hollow, an oil guide hole is formed in the peripheral wall of the rotating shaft, and one end of the oil guide hole is communicated with the oil inlet cavity; A rotor lamination mounted to the rotating shaft, the rotor lamination being provided with a plurality of oil-passing passages penetrating the rotor lamination in an axial direction of the motor rotor; The first balance disc is closely attached to the rotor lamination at one axial side of the rotor lamination, a plurality of radial oil passing grooves are formed in the mounting surface of the first balance disc facing the rotor lamination, and two ends of each radial oil passing groove are respectively communicated with the oil guide hole and the oil passing channel; The mounting surface of the first balancing disk is provided with a groove, the groove partially covers the radial outer end of the radial oil passing groove at the radial outer side of the radial oil passing groove, sealing strips made of sealing materials are filled in the groove and used for blocking cooling oil from flowing out of the radial oil passing groove to the radial outer side, or sealing strips made of sealing materials are arranged on the lamination end surfaces of the rotor lamination, which face the first balancing disk, the sealing materials on the first balancing disk are opposite to the groove, and the radial outer side of the radial oil passing groove partially covers the radial outer end of the radial oil passing groove and is used for blocking cooling oil from flowing out of the radial oil passing groove to the radial outer side.
2. The motor rotor of claim 1, wherein a plurality of said radial oil passing grooves are uniformly distributed in the circumferential direction of said first balance disc, said grooves are provided on the radially outer side of each of said radial oil passing grooves, said grooves are "C" -shaped, and said "C" -shaped openings face said radial oil passing grooves.
3. The motor rotor according to claim 2, wherein the sealing material filled in the groove is rubber, the rubber being at least partially protruded from a surface of the first balance disk around the groove.
4. The motor rotor according to claim 1, wherein the plurality of oil passage grooves are uniformly distributed in the circumferential direction of the rotor lamination, the seal strip is provided on the radially outer side of each of the oil passage grooves, the seal strip includes a "C" shaped portion surrounding the radially outer side portion of the oil passage groove.
5. The motor rotor according to claim 4, wherein the sealing strip is formed by injection molding material for fixing magnetic steel in a magnetic steel groove of the rotor lamination, and the injection molding material in the magnetic steel groove is connected with the sealing strip on at least one circumferential side of the oil passage.
6. The motor rotor of claim 5, wherein the injection molding material in two adjacent magnetic steel grooves on both circumferential sides of the oil passage is connected to a sealing strip.
7. The motor rotor of claim 5, wherein the injection molded material extends at least partially into the groove such that the sealing strip formed of the injection molded material is a clearance fit with the groove.
8. The electric machine rotor of claim 1, wherein the first balance disc is further provided with oil outlet holes located between adjacent two of the radial oil passing grooves and connected to the oil passing passages.
9. The electric machine rotor of claim 8, further comprising a second balancing disk disposed against the rotor lamination on the other axial side of the rotor lamination, the second balancing disk having the same structure as the first balancing disk and being disposed offset from the first balancing disk by a circumferential angle such that oil entering the oil passage from the radial oil passing groove of the first balancing disk flows out from the oil outlet hole of the second balancing disk, and oil entering the oil passage from the radial oil passing groove of the second balancing disk flows out from the oil outlet hole of the first balancing disk.
10. An electric machine comprising the electric machine rotor of any one of claims 1 to 9.

Description

Motor rotor and motor Technical Field The present application relates to a motor rotor and motor which may be used, but is not limited to, as a drive motor for a new energy vehicle. Background In the field of new energy automobile drive motors, the drive motor requires higher power density, efficiency and smaller axial dimensions. For the motor of the hybrid drive unit, the compactness thereof is more important. In order to shorten the axial length of the motor, it is necessary to use an oil passage design closer to the magnetic steel. The scheme can effectively improve heat transfer efficiency, control the temperature of the magnetic steel and reduce the risk of demagnetizing the magnetic steel. Balance discs are usually provided on both sides of the rotor core of the rotor. Currently, these balancing disks generally use aluminum alloys with a thickness greater than 8 mm. In order to further reduce the axial dimensions, thinner balancing discs are required. However, when the thickness of the balance disc is reduced, the balance disc and the rotor core are easily deformed after being assembled into a rotor assembly, resulting in a gap between the balance disc and the core. If this gap is too large, the cooling oil will penetrate directly from the gap into the air gap of the motor, which not only affects the cooling effect, but also increases the churning loss between the rotor and the stator. The current technical scheme is to reduce the deformation after assembly by ensuring the thickness of the balance disc, so that the gap between the balance disc and the iron core is smaller. However, thicker balancing disks increase the axial height of the rotor assembly and the overall weight of the motor. In addition, the matching surfaces of the balance disc and the iron core need to be subjected to finish machining to ensure flatness, so that the manufacturing cost of the motor is further increased. CN113629947a discloses a method and system for oil-cooled rotor lamination, wherein a closed-loop coolant path is formed between the transmission, rotor shaft, encoder end balance plate, rotor lamination stack and output end balance plate. By bringing the oil or coolant into direct contact with the rotor lamination, the thermal path between the rotor lamination and the coolant is greatly reduced, thereby improving the cooling performance. In the oil cooling system disclosed in the above patent, a seal ring groove is provided in the balance plate of the encoder, and a seal is formed between the balance plate and the lamination stack using a seal ring. Disclosure of utility model To reduce the axial height of the motor, the balancing disk can be made of an aluminum alloy with a thickness of less than, for example, 5mm by means of stamping, and no further finishing is performed after stamping. The surface of the balance disc matched with the rotor lamination is the original surface after stamping, the flatness is relatively poor, and a large gap exists between the balance disc and the rotor lamination. Therefore, there is a need to address radial oil leakage between the stamped thin balance disk and the rotor laminations due to the gap. For thin balancing disks that are stamped, such as the grooves in CN113629947a, it is difficult to stamp the balancing disk in one pass, and subsequent machining of the balancing disk is often required. This increases the machining steps of the balancing disk and also increases the manufacturing costs of the motor. In order to overcome or alleviate the above-mentioned drawbacks of the prior art, an object of the present application is to provide a motor rotor, which is capable of effectively preventing leakage of cooling oil from a gap between a balance disc and a rotor lamination to a radial outside. Another object of the present application is to provide an electric machine comprising the above-mentioned electric machine rotor. In order to achieve the above object, the present application may adopt the following technical solutions. One embodiment of the present application provides a motor rotor including: An oil inlet cavity is formed in the rotating shaft which is at least partially hollow, an oil guide hole is formed in the peripheral wall of the rotating shaft, and one end of the oil guide hole is communicated with the oil inlet cavity; A rotor lamination mounted to the rotating shaft, the rotor lamination being provided with a plurality of oil-passing passages penetrating the rotor lamination in an axial direction of the motor rotor; The first balance disc is closely attached to the rotor lamination at one axial side of the rotor lamination, a plurality of radial oil passing grooves are formed in the mounting surface of the first balance disc facing the rotor lamination, and two ends of each radial oil passing groove are respectively communicated with the oil guide hole and the oil passing channel; The mounting surface of the first balancing disk is provided with a groove, the groov