An integrated resolver motor bearing and motor mounting structure

Abstract

This invention belongs to the field of motor technology, specifically relating to an integrated resolver motor bearing. It includes a resolver rotor, a resolver stator, an inner bearing ring, an outer bearing ring, and bearing balls disposed between the inner and outer bearing rings. The resolver rotor is coaxially arranged with the inner bearing ring and is integrally formed on one side of the inner bearing ring. A cylindrical fitting portion is integrally formed on one side of the outer bearing ring, coaxially arranged with the outer bearing ring. The resolver stator is fitted into the inner hole of the fitting portion, with its outer circumferential surface interlocking with the inner hole of the fitting portion. This achieves the integration of the outer bearing ring and the resolver stator, making the resolver stator and the outer bearing ring two independent components that can be machined separately. This solves the technical problems of complex, difficult, and time-consuming inner hole machining when the outer bearing ring and resolver stator are integrally formed. This invention also relates to a motor mounting structure with this integrated resolver motor bearing.

Description

Technical Field

[0001] This invention belongs to the field of motor technology, specifically relating to an integrated resolver motor bearing and motor mounting structure. Background Technology

[0002] The support bearings at the front and rear ends of the motor and the rotary transformer that detects the position, displacement, and speed of the rotating shaft are essential components for industrial motor installation. Since the support bearings and rotary transformer are mounted separately on the motor shaft, a separate axial pressing mechanism is needed to fix the outer ring of the support bearing. The stator and rotor of the rotary transformer also need to be fixed separately, and the rotor and bearing inner ring require two pressing operations to be respectively pressed onto the motor shaft. This process is complex, and the corresponding installation positions on the housing also require multiple machining operations, making the installation process complicated. Furthermore, if either the support bearing or the rotary transformer is damaged, the entire motor needs to be reinstalled. To solve these problems, the rotary transformer and support bearing are usually integrated into a single unit. The outer ring of the support bearing is integrally molded with the stator of the rotary transformer, and the inner ring of the support bearing is integrally molded with the rotor of the rotary transformer. This simplifies and effectively reduces the complexity of installing and disassembling the two components, making installation and disassembly on the motor shaft much easier.

[0003] However, in the existing technology, when the outer ring of the bearing supporting the bearing is integrally formed with the stator of the rotary transformer, the inner hole of the stator and the inner hole of the outer ring of the bearing need to be machined as a whole in one go. However, the two have large structural differences, which makes the machining process of the inner hole complex, difficult and time-consuming. Furthermore, since the outer ring of the bearing is integrally formed with the stator and the inner ring of the bearing is integrally formed with the rotor, it may be that the radial clearance between the stator and the rotor is insufficient, making it difficult for the inner ring and the outer ring of the bearing to make sufficient radial displacement relative to each other. As a result, it is difficult to install the bearing balls between the inner ring and the outer ring of the bearing. Summary of the Invention

[0004] This invention provides an integrated resolver motor bearing and motor mounting structure, solving the problem in the prior art where the outer ring of the bearing supporting the bearing is integrally formed with the stator of the resolver. This is because the inner hole of the stator and the inner hole of the outer ring of the bearing need to be machined as a whole in one operation, but the two have significant structural differences, making the machining process of the inner hole complex, difficult, and time-consuming. Furthermore, since the outer ring of the bearing is integrally formed with the stator, and the inner ring of the bearing is integrally formed with the rotor, insufficient radial clearance between the stator and rotor may result in insufficient relative radial displacement between the inner and outer rings of the bearing, making it difficult to install the bearing balls between the inner and outer rings.

[0005] The technical solution adopted in this invention is: an integrated resolver motor bearing, including an inner bearing ring, an outer bearing ring, and bearing balls disposed between the inner and outer bearing rings. A resolver rotor is integrally formed on one side of the inner bearing ring, and the inner bearing ring and the resolver rotor are coaxially arranged. A cylindrical fitting portion is integrally formed on one side of the outer bearing ring, and the fitting portion is coaxially arranged with the outer bearing ring. A resolver stator is sleeved inside the inner hole of the fitting portion, and the outer circumferential surface of the resolver stator is interference-fitted with the inner hole of the fitting portion.

[0006] Through the above technical solution, under the premise of integrating the outer ring of the bearing with the stator of the rotary transformer, the stator and the outer ring of the bearing are two independent components that can be machined separately. This solves the technical problem that when the outer ring of the bearing supporting the bearing is integrally formed with the stator of the rotary transformer, the inner hole of the stator and the inner hole of the outer ring of the bearing need to be machined as a whole in one go, but the two have large structural differences, which makes the machining process of the inner hole complex, difficult and time-consuming.

[0007] Furthermore, during assembly, the outer ring of the bearing can be first fitted over the inner ring of the bearing. At this time, the fitting part is fitted over the resolver rotor. Using the radial clearance between the inner hole of the fitting part and the resolver rotor, the bearing balls are installed between the inner ring and the outer ring of the bearing. Then, the resolver stator is pressed into the inner hole of the fitting part. This solves the technical problem that, since the outer ring and stator are integrally formed and the inner ring and rotor are integrally formed, the radial clearance between the stator and rotor may be insufficient, making it difficult for the inner and outer rings of the bearing to make sufficient relative radial displacement, thus making it difficult to install the bearing balls between the inner and outer rings of the bearing.

[0008] Furthermore, the diameter of the shaft bore of the resolver rotor is equal to the diameter of the inner bore of the bearing inner ring.

[0009] Furthermore, the diameter of the outer peripheral surface of the fitting portion is equal to the diameter of the outer peripheral surface of the bearing outer ring.

[0010] Furthermore, a lead-out block is integrally formed on the outer peripheral surface of the resolver stator. The lead-out block is arranged radially along the resolver stator, and a lead-out port is provided on the lead-out block for the lead-out of the resolver.

[0011] Furthermore, the outlet is positioned perpendicular to the central axis of the resolver stator.

[0012] Furthermore, the fitting part has a clearance groove at one end away from the outer ring of the bearing, which cooperates with the lead-out block. The clearance groove is arranged radially along the fitting part. The top end of the lead-out block passes through the clearance groove to the outer peripheral surface of the fitting part.

[0013] The present invention also provides a motor mounting structure, including a motor shaft and an integrated resolver motor bearing provided according to the present invention, wherein the integrated resolver motor bearing is sleeved on the motor shaft.

[0014] Furthermore, it also includes a motor rear end cover, wherein the motor bearing of the integrated resolver is sleeved in the bearing hole of the motor rear end cover.

[0015] Furthermore, a positioning shoulder is provided on the side of the motor shaft near the rear end cover of the motor, and the positioning shoulder abuts against the side of the resolver rotor away from the inner ring of the bearing; the inner surface of the shaft hole of the resolver rotor and the inner surface of the inner hole of the bearing inner ring are both interference-fitted with the outer circumferential surface of the motor shaft, and the outer circumferential surface of the bearing outer ring is transition-fitted with the inner surface of the bearing hole of the rear end cover of the motor, and the side of the bearing outer ring away from the resolver stator extends out of the outer surface of the rear end cover of the motor; a plurality of bolt holes are provided circumferentially around the bearing hole on the outer surface of the rear end cover of the motor; each bolt hole is provided with a clamping bolt, and the bolt head of the clamping bolt near the rear end cover of the motor is pressed against the side of the bearing outer ring away from the resolver stator.

[0016] The above technical solution achieves axial and radial fixation of the resolver rotor and the bearing inner ring by interference fit between the inner side of the shaft hole of the resolver rotor and the inner side of the inner hole of the bearing inner ring and the outer circumferential surface of the motor shaft, and also fixes the resolver rotor and the bearing inner ring circumferentially to the motor shaft.

[0017] The positioning shoulder abuts against the side of the resolver rotor away from the inner ring of the bearing, and the bolt head of the clamping bolt, near the rear end cover of the motor, presses against the side of the outer ring of the bearing away from the resolver stator. The bearing balls provide axial positioning between the outer ring and the inner ring, thus axially fixing the outer ring. The friction between the bolt head of the clamping bolt near the rear end cover of the motor and the side of the outer ring away from the resolver stator achieves circumferential fixing of the outer ring. Due to the interference fit between the outer circumferential surface of the resolver stator and the inner hole of the fitting part, both axial and circumferential fixing of the resolver stator are achieved.

[0018] Compared with the existing technology, which typically uses a bearing fixing plate to mount the motor bearing of the integrated rotary transformer on the motor rear end cover, the above technical solution has a simple structure and simplifies the processing steps for the corresponding mounting position on the motor rear end cover, thereby reducing processing costs and parts costs.

[0019] Furthermore, an installation groove is provided on the inner side of the motor rear end cover. The installation groove extends radially along the bearing hole, and one end of the installation groove is connected to the inner side of the bearing hole. The bearing outer ring and the fitting part are both fitted inside the bearing hole. The outer peripheral surface of the bearing outer ring and the outer peripheral surface of the fitting part are transitionally fitted with the inner side of the bearing hole. The top end of the cable outlet block protrudes through the clearance groove of the fitting part to the outer peripheral surface of the fitting part and is installed in the installation groove.

[0020] By setting the mounting groove, the top end of the lead-out block protrudes through the clearance groove of the fitting part to the outer peripheral surface of the fitting part and is installed in the mounting groove. The cooperation between the lead-out block and the mounting groove further strengthens the circumferential fixation of the bearing outer ring and the resolver stator. Attached Figure Description

[0021] Figure 1 The three-dimensional bearing of the motor bearing with integrated resolver in Example 1 Figure 1 ;

[0022] Figure 2 The three-dimensional bearing of the motor bearing with integrated resolver in Example 1 Figure 2 ;

[0023] Figure 3 This is a schematic diagram of the explosion mechanism of the motor bearing with integrated resolver in Example 1;

[0024] Figure 4 This is a cross-sectional view of the resolver rotor and the inner ring of the bearing in Example 1;

[0025] Figure 5 This is a cross-sectional view of the resolver stator and bearing outer ring in Example 1;

[0026] Figure 6 This is a schematic diagram of the motor mounting structure in Example 2;

[0027] Among them, 1—bearing outer ring, 2—bearing inner ring, 3—bearing ball, 4—resolver stator, 5—resolver rotor, 6—motor shaft, 7—motor rear end cover, 8—clamping bolt, 9—fitting part

[0028] 41—Outgoing wire block, 42—Outgoing wire, 91—Avoidance slot. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will now be clearly and completely described with reference to the accompanying drawings:

[0030] Example 1:

[0031] like Figure 1 As shown, this embodiment 1 provides a motor bearing with an integrated resolver, such as... Figure 1 , Figure 2 and Figure 5 As shown, the bearing includes an inner ring 2, an outer ring 1, and bearing balls 3 disposed between the inner ring 2 and the outer ring 1. A resolver rotor 5 is integrally formed on one side of the inner ring 2 and is coaxially arranged with the inner ring 2. A cylindrical fitting part 9 is integrally formed on one side of the outer ring 1 and is coaxially arranged with the outer ring 1. A resolver stator 4 is fitted inside the inner hole of the fitting part 9, and the outer circumferential surface of the resolver stator 4 is interference-fitted with the inner hole of the fitting part 9.

[0032] Through the above technical solution, under the premise of integrating the outer ring 1 of the bearing and the stator 4 of the rotary transformer, the stator 4 of the rotary transformer and the outer ring 1 of the bearing are two independent parts that can be machined separately. This solves the technical problem that when the outer ring of the bearing supporting the bearing and the stator of the rotary transformer are integrally formed, the inner hole of the stator and the inner hole of the outer ring of the bearing need to be machined as a whole in one go, but the two have large structural differences, which makes the machining process of the inner hole complex, difficult and time-consuming.

[0033] Furthermore, during assembly, the outer ring 1 of the bearing can be first fitted over the inner ring 2 of the bearing. At this time, the fitting part 9 is fitted over the resolver rotor 5. Using the radial clearance between the inner hole of the fitting part 9 and the resolver rotor 5, the bearing balls 3 can be installed between the inner ring 2 and the outer ring 1 of the bearing. Then, the resolver stator 4 is pressed into the inner hole of the fitting part 9. This solves the technical problem that, since the outer ring 1 and the stator are integrally formed and the inner ring 2 and the rotor are integrally formed, the radial clearance between the stator and the rotor may be insufficient, making it difficult for the inner ring 2 and the outer ring 1 of the bearing to make sufficient relative radial displacement, thus making it difficult to install the bearing balls 3 between the inner ring 2 and the outer ring 1 of the bearing.

[0034] In this embodiment 1, as Figure 4 As shown, the diameter of the shaft hole of the resolver rotor 5 is equal to the diameter of the inner hole of the bearing inner ring 2.

[0035] In this embodiment 1, as Figure 5 As shown, the diameter of the outer peripheral surface of the fitting part 9 is equal to the diameter of the outer peripheral surface of the bearing outer ring 1.

[0036] In this embodiment 1, as Figure 1 , Figure 2 , Figure 3 and Figure 5 As shown, a lead-out block 41 is integrally formed on the outer peripheral surface of the resolver stator 4. The lead-out block 41 is arranged radially along the resolver stator 4. The lead-out block 41 is provided with a lead-out port, which is used for the lead-out wire 42 of the resolver.

[0037] The outlet of the output block 41 is set perpendicular to the central axis of the resolver stator 4.

[0038] Among them, such as Figure 2 and Figure 3 As shown, the fitting part 9 has a relief groove 91 at one end away from the outer ring 1 of the bearing, which cooperates with the wire outlet block 41. The relief groove 91 is arranged radially along the fitting part 9. The top end of the wire outlet block 41 passes through the relief groove 91 and extends to the outer peripheral surface of the fitting part 9.

[0039] Example 2:

[0040] like Figure 6 As shown, based on the integrated resolver motor bearing provided in Embodiment 1, Embodiment 2 provides a motor mounting structure, including a motor shaft 6 and the integrated resolver motor bearing provided in Embodiment 1, wherein the integrated resolver motor bearing is sleeved on the motor shaft 6.

[0041] The motor mounting structure provided in this embodiment 2 also includes a motor rear end cover 7, and the motor bearing of the integrated resolver provided in embodiment 1 is sleeved in the bearing hole of the motor rear end cover 7.

[0042] In this embodiment 2, as Figure 6 As shown, a positioning shoulder is provided on the side of the motor shaft 6 near the motor rear end cover 7, and the positioning shoulder abuts against the side of the resolver rotor 5 away from the inner ring 2 of the bearing; the inner side of the shaft hole of the resolver rotor 5 and the inner side of the inner hole of the bearing inner ring 2 are both interference fit with the outer circumferential surface of the motor shaft 6, and the outer circumferential surface of the bearing outer ring 1 is transition fit with the inner side of the bearing hole of the motor rear end cover 7, and the side of the bearing outer ring 1 away from the resolver stator 4 extends out of the outer side of the motor rear end cover 7; multiple bolt holes are provided circumferentially around the bearing hole on the outer side of the motor rear end cover 7; each bolt hole is provided with a clamping bolt 8, and the bolt head of the clamping bolt 8 is clamped on the side of the bearing outer ring 1 away from the resolver stator 4 on the side of the motor rear end cover 7.

[0043] The above technical solution achieves axial and radial fixation of the resolver rotor 5 and the bearing inner ring 2 by making the inner side of the shaft hole of the resolver rotor 5 and the inner side of the inner hole of the bearing inner ring 2 both interference fit with the outer circumferential surface of the motor shaft 6, and makes the resolver rotor 5 and the bearing inner ring 2 circumferentially fixed to the motor shaft 6.

[0044] The positioning shoulder abuts against the side of the resolver rotor 5 away from the inner ring 2 of the bearing, and the bolt head of the clamping bolt 8 is pressed against the side of the outer ring 1 of the bearing away from the resolver stator 4 near the rear end cover 7 of the motor. The bearing balls 3 are used to limit the axial movement between the outer ring 1 and the inner ring 2 of the bearing, thus axially fixing the outer ring 1. The friction between the bolt head of the clamping bolt 8 near the rear end cover 7 of the motor and the side of the outer ring 1 away from the resolver stator 4 achieves circumferential fixing of the outer ring 1. Since the outer circumferential surface of the resolver stator 4 is interference-fitted with the inner circumferential surface of the fitting part 9, the axial and circumferential fixing of the resolver stator 4 is achieved.

[0045] Compared with the existing technology, which typically uses a bearing fixing plate to mount the motor bearing of the integrated rotary transformer on the motor rear end cover, the above technical solution has a simple structure and simplifies the processing steps for the corresponding mounting position on the motor rear end cover, thereby reducing processing costs and parts costs.

[0046] Preferably, in this embodiment 2, an installation groove (not shown in the figure) is provided on the inner side of the motor rear end cover 7. The installation groove extends radially along the bearing hole, and one end of the installation groove is connected to the inner side of the bearing hole. The bearing outer ring 1 and the fitting part 9 are both fitted inside the bearing hole. The outer peripheral surface of the bearing outer ring 1 and the outer peripheral surface of the fitting part 9 are transitionally fitted with the inner side of the bearing hole. The top end of the wire outlet block 41 passes through the clearance groove 91 of the fitting part 9 to the outer peripheral surface of the fitting part 9 and is installed in the installation groove.

[0047] By setting an installation groove, the top end of the lead-out block 41 passes through the clearance groove 91 of the fitting part 9 to the outer peripheral surface of the fitting part 9 and is installed in the installation groove. The circumferential fixation of the bearing outer ring 1 and the resolver stator 4 can be further strengthened by the cooperation between the lead-out block 41 and the installation groove.

[0048] The integrated resolver motor bearing and motor mounting structure provided by this invention have at least the following technical effects or advantages:

[0049] 1. Under the premise of integrating the outer ring 1 of the bearing and the stator 4 of the rotary transformer, the stator 4 of the rotary transformer and the outer ring 1 of the bearing are two independent parts that can be machined separately. This solves the technical problem that when the outer ring of the bearing supporting the bearing and the stator of the rotary transformer are integrally formed, the inner hole of the stator and the inner hole of the outer ring of the bearing need to be machined as a whole in one go, but the two have large structural differences, which makes the machining process of the inner hole complex, difficult and time-consuming.

[0050] Furthermore, during assembly, the outer ring 1 of the bearing can be first fitted over the inner ring 2 of the bearing. At this time, the fitting part 9 is fitted over the resolver rotor 5. Using the radial clearance between the inner hole of the fitting part 9 and the resolver rotor 5, the bearing balls 3 can be installed between the inner ring 2 and the outer ring 1 of the bearing. Then, the resolver stator 4 is pressed into the inner hole of the fitting part 9. This solves the technical problem that, since the outer ring 1 and the stator are integrally formed and the inner ring 2 and the rotor are integrally formed, the radial clearance between the stator and the rotor may be insufficient, making it difficult for the inner ring 2 and the outer ring 1 of the bearing to make sufficient relative radial displacement, thus making it difficult to install the bearing balls 3 between the inner ring 2 and the outer ring 1 of the bearing.

[0051] 2. By making the inner side of the shaft hole of the resolver rotor 5 and the inner side of the inner hole of the bearing inner ring 2 both interference fit with the outer circumferential surface of the motor shaft 6, the axial and radial fixation of the resolver rotor 5 and the bearing inner ring 2 are achieved, and the resolver rotor 5 and the bearing inner ring 2 are circumferentially fixed to the motor shaft 6.

[0052] The positioning shoulder abuts against the side of the resolver rotor 5 away from the inner ring 2 of the bearing, and the bolt head of the clamping bolt 8 is pressed against the side of the outer ring 1 of the bearing away from the resolver stator 4 near the rear end cover 7 of the motor. The bearing balls 3 are used to limit the axial movement between the outer ring 1 and the inner ring 2 of the bearing, thus achieving axial fixation of the outer ring 1. The friction between the bolt head of the clamping bolt 8 near the rear end cover 7 of the motor and the side of the outer ring 1 away from the resolver stator 4 achieves circumferential fixation of the outer ring 1. Since the outer circumferential surface of the resolver stator 4 is interference-fitted with the inner circumferential surface of the fitting part 9, both axial and circumferential fixation of the resolver stator 4 are achieved. Compared with the existing technology, which usually uses a bearing fixing plate to install the motor bearing of the integrated resolver on the rear end cover of the motor, the structure is simple, and the processing steps of the corresponding installation position on the rear end cover of the motor are simplified, reducing processing costs and parts costs.

[0053] 3. By setting an installation groove, the top of the wire outlet block 41 passes through the clearance groove 91 of the fitting part 9 to the outer peripheral surface of the fitting part 9 and is installed in the installation groove. The circumferential fixation of the bearing outer ring 1 and the resolver stator 4 can be further strengthened by the cooperation of the wire outlet block 41 and the installation groove.

[0054] The above are merely specific application examples of the present invention and do not constitute any limitation on the scope of protection of the present invention. All technical solutions formed by equivalent transformation or equivalent substitution fall within the scope of protection of the present invention.

Claims

1. A motor mounting structure, characterized in that: The device includes a motor shaft and an integrated resolver motor bearing, wherein the integrated resolver motor bearing is sleeved on the motor shaft; The motor mounting structure also includes a motor rear end cover, and the motor bearing of the integrated resolver is sleeved in the bearing hole of the motor rear end cover; The integrated resolver motor bearing includes an inner bearing ring, an outer bearing ring, and bearing balls disposed between the inner and outer bearing rings. A resolver rotor is integrally formed on one side of the inner bearing ring, and the inner bearing ring and the resolver rotor are coaxially arranged. A cylindrical fitting portion is integrally formed on one side of the outer bearing ring, and the fitting portion is coaxially arranged with the outer bearing ring. A resolver stator is sleeved inside the inner hole of the fitting portion, and the outer circumferential surface of the resolver stator is interference-fitted with the inner hole of the fitting portion. A lead-out block is integrally formed on the outer peripheral surface of the resolver stator. The lead-out block is arranged radially along the resolver stator. The lead-out block is provided with a lead-out port for the lead-out of the resolver stator. The fitting part has a clearance groove at one end away from the outer ring of the bearing, which mates with the lead-out block. The clearance groove is arranged radially along the fitting part. The top end of the lead-out block protrudes through the clearance groove to the outer peripheral surface of the fitting part. A positioning shoulder is provided on the side of the motor shaft near the rear end cover of the motor, and the positioning shoulder abuts against the side of the resolver rotor away from the inner ring of the bearing; the inner surface of the shaft hole of the resolver rotor and the inner surface of the inner hole of the bearing inner ring are both interference-fitted with the outer circumferential surface of the motor shaft, and the outer circumferential surface of the bearing outer ring is transition-fitted with the inner surface of the bearing hole of the rear end cover of the motor, and the side of the bearing outer ring away from the resolver stator extends out of the outer surface of the rear end cover of the motor; a plurality of bolt holes are provided circumferentially around the bearing hole on the outer surface of the rear end cover of the motor; each bolt hole is provided with a clamping bolt, and the bolt head of the clamping bolt near the rear end cover of the motor is pressed against the side of the bearing outer ring away from the resolver stator.

2. The motor mounting structure according to claim 1, characterized in that: An installation groove is provided on the inner side of the motor rear end cover. The installation groove extends radially along the bearing hole. One end of the installation groove is connected to the inner side of the bearing hole. The bearing outer ring and the fitting part are both fitted inside the bearing hole. The outer circumferential surface of the bearing outer ring and the outer circumferential surface of the fitting part are transitionally fitted with the inner side of the bearing hole. The top end of the cable outlet block protrudes through the clearance groove of the fitting part to the outer circumferential surface of the fitting part and is installed in the installation groove.

3. The motor mounting structure according to claim 1, characterized in that: The diameter of the shaft bore of the resolver rotor is equal to the diameter of the inner bore of the bearing inner ring.

4. The motor mounting structure according to claim 1, characterized in that: The diameter of the outer circumferential surface of the fitting part is equal to the diameter of the outer circumferential surface of the bearing outer ring.

5. The motor mounting structure according to claim 1, characterized in that: The outlet is positioned perpendicular to the central axis of the rotary stator.

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