Fixing structure of EPS motor end cover

Abstract

The utility model relates to the technical field of permanent magnet synchronous motors, in particular to a fixing structure of an EPS motor end cover, which comprises a motor end cover, a wave washer, a casing, a rotating shaft and an end cover bearing, the circumferential surface of the motor end cover is in interference fit with the casing, and the center of the outer side of the motor end cover is provided with an inward concave end cover chamber. A wave washer, an end cover bearing and a motor end cover are installed in the end cover chamber, the wave washer and the end cover bearing are arranged outside the end portion of the rotating shaft in a sleeving mode, and the wave washer is located between the end cover bearing and the motor end cover. Compared with the prior art, the fixing structure of the wave washer and the motor end cover is optimized, so that the axial force of the wave washer on the motor end cover points to the motor end, the motor end cover is prevented from popping up when the motor and the ECU are assembled, and the problem of assembly failure caused by the popping up is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of permanent magnet synchronous motors, in particular to a fixing structure of an EPS motor end cover. Background Art

[0002] The SCU of the current automotive electronic power steering system EPS is mainly composed of ECU and motor assembly. ECU mainly includes the main body component, sealing ring and fixing plate. Figure 1 As shown, the motor mainly includes a housing 101, a stator assembly 102, a rotor core 103, a rotating shaft 104, a housing bearing 105, a collector ring 106, an end cover bearing 107, a wave washer 108, and an original end cover 109.

[0003] The original motor end cover and housing are cast aluminum with interference fit design. During the assembly process of the original motor end cover, a heating ring is usually used to heat the housing to expand it; a corrugated gasket is placed in the end cover chamber, and then the original motor end cover is grabbed by equipment and installed in the housing. After the housing temperature cools and shrinks, the housing and the circumferential surface of the original motor end cover are interference fit and tightly held, thereby achieving the effect of fixing the original motor end cover on the housing.

[0004] like Figure 2 As shown, during this assembly process, when the original end cover 109 is installed in place, the wave washer 108 will be compressed by the original end cover 109 and the end cover bearing 107, and the wave washer 108 will provide an axial preload force pointing to the motor end to the end cover bearing 107 to prevent the end cover bearing 107 from generating noise. Under the effect of the action force and reaction force, the wave washer 108 will also provide an axial force pointing to the ECU end to the original end cover 109.

[0005] The motor housing and the ECU fixing plate are also interference fit. During assembly, a heating ring is used to heat the motor housing to expand the housing, and then the ECU is grabbed by the equipment and installed in the housing. After the housing temperature cools and shrinks, the housing and the ECU fixing plate are interference fit, thereby achieving the effect of fixing the ECU on the motor.

[0006] When the motor casing is heated with a heating ring and the ECU is assembled, the casing will expand and the interference fit between the casing and the original end cover of the motor will decrease. At this time, the original end cover of the motor is easy to loosen, and because the corrugated washer provides an axial force pointing to the ECU end to the original end cover of the motor, the original end cover of the motor is easy to pop out, causing assembly failure.

[0007] Therefore, it is necessary to design a fixing structure for the EPS motor end cover to solve the problem of the motor end cover popping out due to the thermal expansion of the motor casing and the axial force of the corrugated gasket on the motor end cover pointing to the ECU end when the motor and ECU are assembled. Summary of the invention

[0008] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a fixing structure for an EPS motor end cover to solve the problem of the motor end cover popping out due to the thermal expansion of the motor casing and the axial force of the corrugated gasket on the motor end cover pointing to the ECU end when the motor and the ECU are assembled.

[0009] In order to achieve the above-mentioned purpose, the utility model is a fixing structure of an EPS motor end cover, comprising a motor end cover, a corrugated washer, a casing, a rotating shaft, and an end cover bearing. The circumferential surface of the motor end cover is interference fit with the casing, an inwardly recessed end cover chamber is provided at the center of the outer side of the motor end cover, a corrugated washer and an end cover bearing are installed in the end cover chamber, the motor end cover, the corrugated washer, and the end cover bearing are sleeved outside the end of the rotating shaft, and the corrugated washer is located between the end cover bearing and the motor end cover.

[0010] The surface of the motor end cover is provided with a plurality of reinforcing ribs.

[0011] A through hole is provided on the surface of the motor end cover, and the collector ring passes through the through hole.

[0012] A rotor core is installed in the middle of the rotating shaft, a stator assembly is arranged outside the rotor core, and the stator assembly is fixed inside the casing.

[0013] The other end of the rotating shaft is connected to the casing by a casing bearing.

[0014] The outer side of the motor end cover is the side close to the ECU.

[0015] Compared with the prior art, the utility model optimizes the fixing structure of the corrugated gasket and the motor end cover so that the axial force of the corrugated gasket on the motor end cover is directed to the motor end, thus preventing the motor end cover from popping out when the motor and the ECU are assembled, and solving the assembly failure problem caused thereby. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the prior art.

[0017] Figure 2 for Figure 1 Enlarged view of point A.

[0018] Figure 3 It is a structural schematic diagram of the utility model.

[0019] Figure 4 for Figure 3 Enlarged view of point B.

[0020] Figure 5 It is an axonometric view of the motor end cover of the utility model.

[0021] Figure 6 It is a cross-sectional view of the motor end cover of the utility model. Implementation

[0022] The utility model is now further described with reference to the accompanying drawings.

[0023] See also Figure 3 and Figure 4 The utility model is a fixing structure of an EPS motor end cover, including a motor end cover, a wave washer, a housing, a rotating shaft, and an end cover bearing. The circumferential surface 11 of the motor end cover 1 is interference fit with the housing 101. An end cover chamber 12 which is recessed inward is provided at the center of the outer side of the motor end cover 1. A wave washer 108 and an end cover bearing 107 are installed in the end cover chamber 12. The motor end cover 1, the wave washer 108, and the end cover bearing 107 are sleeved outside the end of the rotating shaft 104, and the wave washer 108 is located between the end cover bearing 107 and the motor end cover 1. The outer side of the motor end cover 1 is the side close to the ECU.

[0024] See also Figure 5 , Figure 6 A plurality of reinforcing ribs 13 are provided on the surface of the motor end cover 1 to improve the strength of the motor end cover 1 .

[0025] A through hole 14 is provided on the surface of the motor end cover 1 , and the collector ring 106 passes through the through hole 14 , so that the collector ring 106 is exposed from the cavity inside the housing 101 .

[0026] The middle of the rotating shaft 104 is provided with a rotor core 103, and the outer sleeve of the rotor core 103 is provided with a stator assembly 102, and the stator assembly 102 is fixed inside the housing 101. The other end of the rotating shaft 104 is connected to the housing 101 by a housing bearing 105.

[0027] When the utility model is working, since the corrugated washer 108 is installed in the end cover chamber 12 of the motor end cover 1 close to the ECU side, and the corrugated washer 108 is located between the end cover bearing 107 and the motor end cover 1, the axial force provided by the corrugated washer 108 to the motor end cover 1 is directed to the motor end. When assembling the motor and the ECU, the motor housing expands due to heat, resulting in a reduction in the interference between the circumferential surface 11 of the motor end cover 1 and the housing 101, but the corrugated washer 108 provides the motor end cover 1 with an axial force directed to the motor end, which has a pressing effect on the motor end cover 1, so that the motor end cover 1 is firmly fixed and will not loosen. After the ECU is installed and the housing 101 is cooled, the housing 101 and the circumferential surface 11 of the motor end cover 1 resume the interference fit, and the motor end cover 1 has no risk of loosening or popping out during the entire assembly process of the motor and the ECU, ensuring smooth assembly.

[0028] The utility model optimizes the fixing structure of the corrugated washer and the motor end cover so that the axial force of the corrugated washer on the motor end cover is directed to the motor end, thus preventing the motor end cover from popping out when the motor and the ECU are assembled, and solving the assembly failure problem caused thereby.

Claims

1. A fixing structure of an EPS motor end cover, comprising a motor end cover, a wave washer, a housing, a rotating shaft, and an end cover bearing, characterized in that: The circumferential surface (11) of the motor end cover (1) is interference-fitted with the housing (101); an inwardly recessed end cover chamber (12) is provided at the center of the outer side of the motor end cover (1); a wave washer (108) and an end cover bearing (107) are installed in the end cover chamber (12); the motor end cover (1), the wave washer (108) and the end cover bearing (107) are sleeved outside the end of the rotating shaft (104), and the wave washer (108) is located between the end cover bearing (107) and the motor end cover (1).

2. The fixing structure of the EPS motor end cover according to claim 1 is characterized in that: The surface of the motor end cover (1) is provided with a plurality of reinforcing ribs (13).

3. The fixing structure of the EPS motor end cover according to claim 1 is characterized in that: A through hole (14) is provided on the surface of the motor end cover (1), and the collector ring (106) passes through the through hole (14).

4. The fixing structure of the EPS motor end cover according to claim 1 is characterized in that: A rotor core (103) is installed in the middle of the rotating shaft (104), a stator assembly (102) is arranged on the outer shell of the rotor core (103), and the stator assembly (102) is fixed inside the casing (101).

5. The fixing structure of the EPS motor end cover according to claim 1 is characterized in that: The other end of the rotating shaft (104) is connected to the housing (101) by means of a housing bearing (105).

6. The fixing structure of the EPS motor end cover according to claim 1 is characterized in that: The outer side of the motor end cover (1) is the side close to the ECU.

Images