EPS motor rotor core lamination fixing structure

Abstract

The utility model relates to the technical field of motors, in particular to an EPS motor rotor iron core lamination fixing structure, which comprises an EPS motor rotating shaft, a rotor iron core, a nut and a rivet, two sections of threads are arranged on the surface of the EPS motor rotating shaft, a through hole penetrating through the EPS motor rotating shaft is arranged in the middle of each section of thread, the rotor iron core is sleeved outside the EPS motor rotating shaft and is positioned between the two sections of threads, and the nut is connected with the rivet. The two ends of the rotor core are respectively provided with a nut, the two nuts are respectively meshed with the corresponding threads, the rivet is installed in the through hole, the two ends of the rivet are exposed out of the through hole and abut against the outer surface of the nut, and the inner surface of the nut abuts against the end face of the rotor core. Compared with the prior art, the number of parts is reduced, assembly in a normal temperature state is realized, the process difficulty is reduced, and the assembly cost is saved; the fixing reliability and strength of the rotor core are improved, the defects of deformation and warping of the rotor core are overcome, the electromagnetic loss of the rotor is reduced, and the use efficiency of the EPS motor is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to an EPS motor rotor iron core lamination fixing structure. Background Art

[0002] The traditional EPS motor rotor core structure is combined by core stacking and core buckle point riveting, resulting in weak bonding force between the rotor core laminations, requiring secondary fixing measures such as installing a rotor cover.

[0003] When the rotor core is fixed with a rotor cover, the shrink-fit process is used, which is not only cumbersome and increases the assembly cost, but also prone to deformation and warping defects at the contact between the rotor core and the shaft, which affects the electromagnetic system of the EPS motor and aggravates the magnetic loss of the EPS motor. In addition, the use of the rotor cover increases the gap between the rotor and the stator, reduces the interaction between the stator and the rotor, and reduces the efficiency of the EPS motor.

[0004] Therefore, it is necessary to design an EPS motor rotor core lamination fixing structure to quickly realize the assembly and combination of the EPS motor rotor core under normal temperature conditions, avoid deformation and warping of the rotor core, and thus improve the utilization efficiency of the EPS motor. Summary of the invention

[0005] The purpose of the utility model is to overcome the deficiencies of the prior art and provide an EPS motor rotor core lamination fixing structure to quickly realize the assembly and combination of the EPS motor rotor core under normal temperature conditions, avoid deformation and warping of the rotor core, and thus improve the use efficiency of the EPS motor.

[0006] In order to achieve the above-mentioned purpose, the utility model is an EPS motor rotor core lamination fixing structure, comprising an EPS motor shaft, a rotor core, a nut, and a rivet. The surface of the EPS motor shaft is provided with two sections of threads, and the middle of each section of the threads is provided with a through hole that penetrates the EPS motor shaft. The rotor core is sleeved outside the EPS motor shaft and is located between the two sections of threads. A nut is respectively provided at both ends of the rotor core, and the two nuts are respectively engaged with the corresponding threads. The rivet is installed in the through hole, and the two ends of the rivet are exposed outside the through hole and abut against the outer surface of the nut, and the inner surface of the nut abuts against the end face of the rotor core.

[0007] The rotor core is formed by stacking a plurality of rotor core laminations.

[0008] The nut is a self-locking nut or a double nut.

[0009] The spacing between the through holes matches the thickness of the rotor core and the thickness of the two nuts.

[0010] Compared with the prior art, the utility model adds threads on the EPS motor shaft and uses nuts to fix the rotor core, thereby reducing the number of parts, realizing assembly at room temperature, reducing the process difficulty, and saving assembly costs; rivets are used to prevent the nuts from loosening, thereby increasing the reliability and strength of the rotor core fixation, effectively solving the defects of deformation and warping of the rotor core, reducing the rotor electromagnetic loss, and effectively improving the use efficiency of the EPS motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of the utility model.

[0012] Figure 2 It is a structural schematic diagram of the EPS motor shaft of the utility model.

[0013] Figure 3 It is a structural schematic diagram of the rivet of the utility model. DETAILED DESCRIPTION

[0014] The utility model is now further described with reference to the accompanying drawings.

[0015] See also Figure 1 , Figure 2 , Figure 3 The utility model is an EPS motor rotor core lamination fixing structure, comprising an EPS motor shaft, a rotor core, a nut, and a rivet. The surface of the EPS motor shaft 1 is provided with two sections of threads 11, and the middle part of each section of the threads 11 is provided with a through hole 12 that penetrates the EPS motor shaft 1. The rotor core 2 is sleeved outside the EPS motor shaft 1 and is located between the two sections of the threads 11. A nut 3 is respectively provided at both ends of the rotor core 2, and the two nuts 3 are respectively engaged with the corresponding threads 11. The rivet 4 is installed in the through hole 12, and the two ends of the rivet 4 are exposed outside the through hole 12 and abut against the outer surface of the nut 3. The inner surface of the nut 3 abuts against the end face of the rotor core 2, so as to realize the self-locking and fixation of the rotor core 2 and avoid the loosening of the nut 3.

[0016] The rotor core 2 is formed by stacking a plurality of rotor core laminations. The utility model ensures the tight combination of the EPS motor rotor core laminations through the combination of the nut 3 and the rivet 4, eliminates the rotor cover, reduces the gap between the rotor and the stator, and improves the use efficiency of the EPS motor.

[0017] The nut 3 is a self-locking nut or a double nut to meet the requirements of special usage scenarios.

[0018] The spacing between the through holes 12 matches the thickness of the rotor core 2 and the thickness of the two nuts 3 to ensure the tight combination of the EPS motor rotor core laminations.

[0019] After theoretical verification, the EPS motor shaft 1 and the nut 3 meet the requirements of fastening assembly, the longer static friction between the EPS motor shaft 1 end and the nut 3 meets the rotor design requirements of the EPS motor, and due to the use of the rivet 4, the nut 3 is more firmly guaranteed not to loosen or fall off.

[0020] The utility model adds threads to the EPS motor shaft and uses nuts to fix the rotor core, which reduces the number of parts, realizes assembly at room temperature, reduces the process difficulty, and saves assembly cost; rivets are used to prevent the nuts from loosening, increase the reliability and strength of the rotor core fixation, effectively solve the defects of deformation and warping of the rotor core, reduce the rotor electromagnetic loss, and effectively improve the use efficiency of the EPS motor.

Claims

1. An EPS motor rotor core lamination fixing structure, comprising an EPS motor shaft, a rotor core, a nut, and a rivet, characterized in that: The surface of the EPS motor shaft (1) is provided with two sections of threads (11), and a through hole (12) penetrating the EPS motor shaft (1) is provided in the middle of each section of threads (11). The rotor core (2) is sleeved outside the EPS motor shaft (1) and is located between the two sections of threads (11). A nut (3) is provided at each end of the rotor core (2), and the two nuts (3) are respectively engaged with the corresponding threads (11). The rivet (4) is installed in the through hole (12), and the two ends of the rivet (4) are exposed outside the through hole (12) and abut against the outer surface of the nut (3), and the inner surface of the nut (3) abuts against the end surface of the rotor core (2).

2. The EPS motor rotor core lamination fixing structure according to claim 1, characterized in that: The rotor core (2) is formed by stacking a plurality of rotor core laminations.

3. The EPS motor rotor core lamination fixing structure according to claim 1, characterized in that: The nut (3) is a self-locking nut or a double nut.

4. The EPS motor rotor core lamination fixing structure according to claim 1, characterized in that: The spacing between the through holes (12) matches the thickness of the rotor core (2) and the thickness of the two nuts (3).

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