Press fitting method for motor rotor and bearing
By synchronously tightening the core winding section and partition section of the motor rotor by self-centering, the problem of deflection and bending easily in the bearing pressing process is solved, and high-precision pressing of the bearing and stable operation of the equipment is achieved.
Patent Information
- Application Number
- CN202510312685.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-05-22
- Publication Date
- 2025-05-23
AI Technical Summary
During the pressing and installation of the motor rotor bearing, the middle part of the rotor is prone to deflection and bending, resulting in bearing wear, increased vibration and reduced life.
The core winding section and partition section of the motor rotor are tightened simultaneously by self-centering to form a whole to offset the pressure and punching pressure of the actuator, and hedge against the pressing action of the pressing mechanism through the propulsion trend of the actuator to reduce bearing stress.
It effectively avoids the inclination and deformation of the iron core shaft, reduces the stress of the bearing during the pressing process, and improves the pressing accuracy of the bearing and the stability of the equipment.
Smart Images
Figure CN120033926A_ABST
Abstract
Description
[0001] This application is a divisional application of the Chinese patent application filed on May 22, 2023, with application number 2023105803778 and invention name “Motor rotor bearing pressing method and device”. Technical Field
[0002] The invention belongs to the technical field of electric motor production and manufacturing, and in particular to a method and a device for pressing a motor rotor bearing. Background Art
[0003] In many motors and mechanical equipment, the rotor is one of the key components. The performance and stability of the rotor directly affect the operation of the entire equipment. In the existing rotor bearing assembly process, the bearing at one end is usually pressed first, and then the other end is pressed. In the process of pressing the bearing of a smaller rotor, due to the small diameter of the rotor core shaft, an interference fit is adopted with the bearing, and the other end face as the force point is far away, thus forming a long force arm, which easily causes deflection and bending in the middle part of the rotor. This bending may cause bearing wear, increased vibration and reduced life, which in turn affects the stable operation and service life of the equipment.
[0004] In the patent document of the authorization announcement number CN114734233B, a press-fitting device for a motor rotor and its use method, a rotor bearing assembly device and method are disclosed. The device includes: a mounting bracket, a servo press, a support mechanism and a load-bearing fixture; wherein the support mechanism drives the centering rod to plug into the lower end of the core shaft to provide support. The core of this technical solution is to support the core shaft by plugging the centering rod into the lower end of the core shaft to avoid deformation of the weak position in the middle or the core shaft during bearing assembly. However, this method requires that the centering rod and the core shaft have very high concentricity, otherwise the deviation of the two impact forces of pressing down and supporting can easily cause the core shaft to bend and deform.
[0005] In summary, the control of concentricity of the invention is not the only way to reduce deformation. Other methods include the control of axial preload, radial synchronous tightening, and support in the middle of the rotor. These methods avoid the requirement of high-precision concentricity between the core rod and the core shaft, thereby simplifying the device structure, which is worth further exploration and implementation in subsequent research. Summary of the invention
[0006] In view of the above problems, the present invention provides a motor rotor press-fit bearing device, which uses a self-centering method to synchronously tighten the motor rotor to form a whole, offset the press-fit punching pressure, and avoid shaft deformation; the push-in trend of the actuator offsets the press-in action to reduce the bearing stress; the automatic reset of the pneumatic part and the drive cylinder allows the motor rotor to exit quickly; the turntable realizes press-fitting at both ends; the detection mechanism monitors the press-fitting to ensure quality. The device has innovations such as automation and high-quality press-fitting, which can meet the needs of related fields.
[0007] The invention objective of the present invention is achieved through the following technical solutions: a motor rotor press-fit bearing device, the motor rotor has some structures before the bearing is installed, including an iron core shaft, an iron core winding and a commutator, the press-fit bearing device includes a horizontal base, a fixture mounting seat fixed on the horizontal base, a self-centering clamping fixture fixed on the fixture mounting seat, a pressing mechanism fixed at one end of the self-centering clamping fixture and a counter supporting mechanism fixed at the other end of the self-centering clamping fixture, and a temporary parking platform fixed between the counter supporting mechanism and the self-centering clamping fixture; the central axis of the self-centering clamping fixture body and the central axes of the working action parts of the pressing mechanism and the counter supporting mechanism are in a horizontal, overlapping and collinear state; The self-centering clamping fixture includes a fixture base with a cylindrical hollow structure and a cylindrical wall with a plurality of symmetrical array openings, and the fixture base is fixed in the air on a base fixing seat above the fixture mounting seat in a manner that the axis is horizontal; A first synchronous tightening member for self-centering tightening of the core winding is provided at the position of the opening in the jig base; the first synchronous tightening member includes a guide slot arranged from high to low relative to the central axis in the direction from the opposing support mechanism to the pressing mechanism within the inner wall thickness range of each opening in the jig base; a first tightening member that forms a sliding fit with the guide slot is movably provided in each opening of the jig base; while slidingly fitting with the outer peripheral surface of the jig base, each first tightening member is fixedly connected to the driving cylinder; the opposing support mechanism includes an actuator and a power source for advancing the actuator; During operation, the motor rotor with the bearing to be pressed is placed on a temporary parking platform. The actuator, driven by the power source, pushes the motor rotor into the self-centering clamping fixture and presses the actuator against the driving cylinder. The driving cylinder drives all the first tightening members to move at the same time. All the first tightening members clamp the iron core winding segment of the motor rotor in a self-centering manner. The pressing mechanism presses one end of a bearing on the iron core shaft. At the same time, the actuator keeps the driving cylinder moving forward. This trend counteracts the pressing action of the pressing mechanism, offsetting the force on the workpiece pressing the bearing, thereby avoiding tilting and deformation of the iron core shaft.
[0008] Preferably, the core shafts are all stepped shafts, and the bearing mounting parts at both ends have relatively larger diameter spacing sections adjacent to the center; a step is formed between the spacing section and the bearing mounting part, and a second synchronous tightening member is arranged on the side of the fixture base close to the pressing mechanism; The second synchronous tightening member includes an expansion seat that is detachably fixed to the fixture base; the expansion seat is cylindrical in shape as a whole, with a through hole in the center, and the through hole is outwardly expanded toward one side of the fixture base; the outer peripheral surface of this side is provided with a mounting portion connected to the fixture base, and a plurality of through holes are arranged in a circumferential array on the outer peripheral surface away from one end of the mounting portion, and a waist groove for hinged installation is provided in the through hole; the second synchronous tightening member also includes a second tightening piece hingedly arranged in each through hole, and each second tightening piece partially protrudes beyond the outer peripheral surface of the expansion seat after installation. This preferred solution, while retaining the advantages of the original device, achieves wider adaptability to rotors of different structures through the clamping of the spacing segment by the second synchronous tightening member, and has higher versatility.
[0009] Preferably, an elastic member is arranged in the waist groove. The elastic member is arranged in the waist groove of the second synchronous tightening member, replacing the original direct hinge method to achieve a certain range of motion for the connection between the second tightening member and the expansion seat. This facilitates the passage of the core shaft, and the elastic member can be made of elastic components such as rubber.
[0010] The elastic member can generate a certain amount of pre-tightening, and when the drive cylinder is working, the clamping force on the stopper section is further increased through its elastic deformation, thereby effectively offsetting the axial thrust exerted on the workpiece and reducing the axial displacement and deformation of the shaft.
[0011] The provision of the elastic member can effectively make up for the defect that the centripetal displacement generated by the deadweight of the second tightening member alone may be insufficient, and enhance the self-centering and axial thrust-offsetting capabilities of the second synchronous tightening member.
[0012] Preferably, a portion that partially exceeds the outer circumferential surface of the expansion seat has a trigger slope toward the mounting portion, and a flip avoidance notch is provided on the side opposite to the trigger slope.
[0013] Preferably, a resistance rod is arranged at the center of the push actuator, and when the actuator presses against the driving cylinder and causes all the first tightening members to clamp the core winding segments, the end face of the resistance rod just contacts the end face of the core shaft facing that side.
[0014] A flipping avoidance notch is provided on one side relative to the triggering inclined surface. The notch can enable the second tightening member to flip through the notch after axial movement to a certain extent, so that the triggering inclined surface can be reset. The second tightening member repeatedly flips and resets, and continues to produce self-centering displacement and clamping effects.
[0015] The setting of the trigger slope and the flip avoidance notch can enable the second tightening member to continuously and repeatedly generate self-centering displacement and clamping force during the axial movement process, significantly enhance the clamping performance of the second synchronous tightening member during the entire axial displacement process, better offset the axial thrust during the bearing installation, and reduce the axial displacement and deformation.
[0016] This preferred solution is a design improvement based on the original solution. It realizes continuous and repeated self-centering displacement and generation of clamping force of the second tightening member by triggering the inclined surface and flipping the avoidance gap. It is a very effective design that can significantly enhance the performance and scope of use of the device.
[0017] Preferably, the resistance rod is arranged to cooperate with the propulsion actuator through threads, and a set screw is arranged in the propulsion actuator to compress the resistance rod. The resistance rod is arranged in a structure that cooperates with the propulsion actuator through threads. The front and rear adjustment and positioning of the resistance rod are achieved by rotating the propulsion actuator. A set screw is arranged in the propulsion actuator. When the resistance rod is adjusted to an appropriate position, the set screw is used to lock the resistance rod to prevent it from being displaced during operation.
[0018] The setting of the resistance rod is mainly used to provide reverse resistance force, work together with the actuator, offset the axial thrust of the bearing installation during the bearing press-fitting process, and reduce axial displacement and deformation. The threaded connection method makes it easy to adjust and position.
[0019] The setting of the set screw can effectively lock the resistance rod to prevent it from sliding due to excessive force in the process of providing reverse antagonism, ensuring that the resistance rod can play its role stably and reliably and enhance the performance of the device.
[0020] This preferred solution is an improved design of the connection mode and locking structure of the resistance rod in the original device. Through the setting of threaded connection and set screws, the resistance rod has the characteristics of convenient adjustment and positioning and reliable locking during work, effectively exerting its function and improving the performance and stability of the device.
[0021] Preferably, a pneumatic expansion member is fixedly arranged on the outer surface close to the working surface of the propulsion actuator to expand and contract radially to loosen or tighten the core shaft. The pneumatic expansion member is mainly used to adjust the radial tightness of the core shaft after the bearing is pressed.
[0022] Preferably, a turntable is fixedly arranged below the temporary docking platform. The turntable is arranged below the temporary docking platform and is used to support and turn the temporary docking platform. The turntable can make the temporary docking platform rotate within a fixed angle range through its rotating structure.
[0023] The setting of the turntable enables the temporary docking platform to have a certain degree of mobility. Through the rotation of the turntable, the temporary docking platform can be aligned and positioned in different directions on it, thereby expanding the use scope and mobility controllability of the temporary docking platform.
[0024] The turntable can be designed in an annular or partially annular shape, and its rotating mechanism can be a ball ring, a turntable, etc. The temporary docking station can be turned and positioned by a driving motor or manually driven. The rotation position of the temporary docking station can be locked by a brake structure.
[0025] Preferably, the driving cylinder is provided with a contact portion for abutment at least on one side of the corresponding base fixing seat, a receiving hole is provided on the base fixing seat at a position corresponding to the contact portion, an elastic reset member is provided in the receiving hole, and the free end of the elastic reset member is in abutment with the contact portion. The contact portion can be in the form of a notch or protruding from the outer circumference of the driving cylinder, and is used to abut and cooperate with the free end of the elastic reset member.
[0026] A receiving hole is arranged on the base fixing seat at a position corresponding to the contact portion. The inner diameter of the receiving hole is larger than the diameter of the elastic reset member and is used to receive and position the elastic reset member.
[0027] An elastic reset piece is arranged in the receiving hole, one end of the elastic reset piece is fixed in the receiving hole, and the free end abuts against the contact part on the surface of the driving cylinder. Through the elastic deformation of the elastic reset piece, the free end of the elastic reset piece maintains elastic abutment and cooperation with the contact part.
[0028] In view of the above problems, the present invention further provides a bearing press-fitting method, comprising the following steps: a. Place the motor rotor with the bearing to be pressed on a temporary docking station; b. Driven by the power source, the actuator pushes the motor rotor into the self-centering fixture; the actuator presses the drive cylinder at the same time; c. The driving cylinder drives all the first tightening members and the second tightening members to act simultaneously; all the first tightening members clamp the iron core winding section of the motor rotor in a self-centering manner; at the same time, the second tightening members also move toward the center to clamp the gap section; at the same time, the end face of the resistance rod contacts the end face of the iron core shaft facing that side, increasing the force points and further dispersing and offsetting the force on the workpiece (rotor) pressure bearing; d. The pressing mechanism operates to press a bearing onto one end of the core shaft; the actuator keeps the driving cylinder moving forward, which makes the motor rotor have a strong integrity in the previous steps, and forms a counteraction with the pressing action of the pressing mechanism, offsetting the bearing force of the workpiece (rotor) and preventing the core shaft from tilting and deforming; e. When the bearing is pressed at one end, the pneumatic telescopic member extends out of the clamping iron core shaft, and the push actuator retreats. At the same time, the drive cylinder loses the external force and automatically rebounds to reset. The first synchronous tightening member and the second synchronous tightening member both loosen the motor rotor, so as to facilitate the motor rotor to withdraw from the self-centering clamping fixture; the motor rotor is dragged out to the temporary parking platform again as the push actuator retreats; f. Start the turntable to rotate; the support mechanism pushes the motor rotor into the self-centering fixture again, and repeats the aforementioned press-fitting steps to complete the press-fitting of the second end.
[0029] The beneficial effects of the bearing press-fitting method are summarized as follows: 1. The self-centering method is used to synchronously tighten the core winding section and the spacer section of the motor rotor, so that the motor rotor forms a strong integrity during the bearing press-fitting process, which is conducive to offsetting and dispersing the punching force during the bearing press-fitting and avoiding the tilt and deformation of the core shaft.
[0030] 2. While the bearing is being pressed, the actuator is pushed forward to keep the driving cylinder in the forward direction, which counteracts the pressing action of the pressing mechanism and offsets the force of the motor rotor pressing the bearing. This helps to reduce the stress of the bearing during the pressing process and avoid its deformation.
[0031] 3. The pneumatic telescopic member can press and position the core shaft, and the automatic rebound of the drive cylinder can make the first synchronous tightening member and the second synchronous tightening member quickly loosen the motor rotor. This is conducive to the motor rotor to quickly withdraw from the self-centering clamping fixture and improve the bearing press-fitting efficiency.
[0032] 4. The use of a turntable can easily complete the press-fitting of the bearings at both ends without the need to manually flip the motor rotor, reducing the process and labor intensity and improving the level of automation.
[0033] The bearing press-fitting method and device organically combine the mechanical mechanism and the control system to realize the rapid automatic press-fitting of the motor rotor bearing. Compared with the existing technology, it has obvious progress and can provide reference and reference for the technical development of related fields.
[0034] In summary, the present invention has the following advantages compared with the prior art: 1. Use a self-centering method to clamp the motor rotor to ensure that the rotor axis maintains the correct direction, avoids the rotor axis from tilting or offsetting, and ensures the bearing press-fitting accuracy.
[0035] 2. The opposing support mechanism pushes the motor rotor into the self-centering clamping fixture, and drives the first synchronous tightening member and the second synchronous tightening member to move simultaneously by pressing the driving cylinder with the actuator. In addition, the adjustable resistance rod provides reverse resistance at the same time. The actuator keeps the driving cylinder in the forward trend, forming a counteraction with the pressing action of the pressing mechanism, offsetting the bearing pressure of the workpiece (rotor). The motor rotor has an overall resistance at the moment of pressing the bearing, reducing the axial force on the motor rotor during the bearing installation process and avoiding deformation of the core shaft.
[0036] In addition, it can also achieve fast and accurate clamping and improve work efficiency, and can be applied to motor rotors of different structures, having a wide range of applications.
[0037] The method and device adopt a self-centering method to synchronously tighten the motor rotor to form a whole, offset the press-fitting pressure, and avoid shaft deformation; the advancing trend of the actuator offsets the press-fitting action to reduce the bearing stress; the automatic reset of the pneumatic parts and the drive cylinder allows the motor rotor to exit quickly; the turntable realizes press-fitting at both ends; the detection mechanism monitors the press-fitting to ensure quality. Compared with the existing technology, this method and device has innovations such as automation and high-quality press-fitting, which can meet the needs of related fields and have application value. BRIEF DESCRIPTION OF THE DRAWINGS
[0038] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is the structural schematic diagram of the motor rotor; Figure 3 This is an exploded view of some parts after the centering fixture and the opposing support mechanism are combined; Figure 4 for Figure 3 A partial enlarged view of point B in the middle; Figure 5 It is a schematic diagram of the structure in which a part of the second synchronous tightening member is cut away; Figure 6 It is a schematic diagram of the structure after the self-centering clamping fixture, temporary docking platform and part of the power source are combined (some parts are omitted and some parts are in an exploded state); Figure 7 for Figure 1 A partial enlarged view of point A in the middle.
[0039] Markings in the figure: Bearing mounting portion 001, gap section 002, motor rotor 01, core shaft 02, core winding 03, commutator 04, set screw 06, turntable 07, device table 10, horizontal base 20, fixture mounting seat 30, self-centering clamping fixture 40, fixture base 41, base fixing seat 42, first synchronous tightening component 100, guide slot 101, first tightening member 102, driving cylinder 411, contact portion 412, accommodating hole 421, elastic reset member 422, pressing mechanism 50, opposing support mechanism 60, propulsion actuator 61, power source 62, resistance rod 63, pneumatic telescopic member 64, temporary parking platform 70, second synchronous tightening component 200, extension seat 201, mounting portion 202, through hole 203, waist groove 204, second tightening member 205, elastic member 206, trigger slope 207, avoidance gap 208. DETAILED DESCRIPTION
[0040] The present invention will be further described below in conjunction with the embodiments shown in the accompanying drawings: Example 1 like Figure 1As shown, the present invention discloses a motor rotor press-fit bearing device. This device is used to solve the problems that may occur when the motor rotor 01 is installed with bearings. Before the bearings are installed, the motor rotor 01 itself has some structures, including the iron core shaft 02, the iron core winding 03 and the commutator 04. The device combines these structures and sets synchronous tightening components at different radial positions. While the bearing is being pressed, these tightening components apply a force in the opposite direction to the force of the workpiece (rotor), so that the rotor forms a whole, which plays a role in dispersing and offsetting the pressure of the workpiece (rotor), thereby avoiding the tilt and deformation of the iron core shaft.
[0041] The device includes a device table 10, a horizontal base 20 fixedly mounted on the device table 10, a fixture mounting seat 30 fixedly mounted on the horizontal base 20, a self-centering clamping fixture 40 fixedly mounted on the fixture mounting seat 30, a pressing mechanism 50 fixedly mounted at one end of the self-centering clamping fixture 40, and a counter-support mechanism 60 fixedly mounted at the other end of the self-centering clamping fixture 40, and a temporary parking platform 70 fixedly mounted between the counter-support mechanism 60 and the self-centering clamping fixture 40. The central axis of the main body of the self-centering clamping fixture 40 and the central axes of the working action parts of the pressing mechanism 50 and the counter-support mechanism 60 are in a horizontal, overlapping, and collinear state.
[0042] The press-fitting mechanism 50 adopts a press-fitting mechanism commonly used in bearing press-fitting in the prior art.
[0043] The self-centering clamping fixture 40 includes a fixture base 41 with a cylindrical hollow structure and a cylindrical wall having a plurality of symmetrical array openings. The fixture base 41 is fixed in the air to a base fixing seat 42 above the fixture mounting seat 30 in a horizontal manner. A first synchronous tightening member 100 for self-centering tightening of the core winding 03 is provided at the position of the opening in the jig base 41. The first synchronous tightening member 100 includes a guide slot 101 arranged from high to low relative to the central axis in the direction from the opposing support mechanism 60 to the pressing mechanism 50 within the inner wall thickness range of each opening in the jig base 41. A first tightening member 102 is movably provided in each opening of the jig base 41 to form a sliding fit with the guide slot 101. While slidingly fitting with the outer peripheral surface of the jig base 41, each first tightening member 102 is fixedly connected to the driving cylinder 411. The opposing support mechanism 60 includes an actuator 61 and a power source 62 for advancing the actuator 61.
[0044] During operation, the motor rotor 01 to be press-fitted with the bearing is placed on a temporary parking platform 70. The actuator 61, driven by the power source 62, pushes the motor rotor 01 into the self-centering clamping fixture 40, and presses the actuator 61 against the driving cylinder 411. The driving cylinder 411 drives all the first tightening members 102 to move at the same time. All the first tightening members 102 clamp the core winding 03 section of the motor rotor 01 in a self-centering manner. The pressing mechanism 50 is actuated to press one end of a bearing onto the core shaft 02. At the same time, the actuator 61 keeps the driving cylinder 411 moving forward. This trend counteracts the pressing action of the pressing mechanism 50, offsetting the force exerted on the workpiece (rotor) by the pressing bearing, thereby avoiding tilting and deformation of the core shaft.
[0045] Reference Figure 2 The core shaft 02 is a stepped shaft, and the bearing mounting parts 001 at both ends have a relatively larger diameter spacer section 002 adjacent to the center. A step is formed between the spacer section 002 and the bearing mounting part 001, which is used to locate the position of the bearing after the final press-fitting is completed.
[0046] like Figure 5 As shown, in order to increase the strength of self-centering tightening and further disperse the punching force of the press-fitting mechanism 50, a second synchronous tightening member 200 is provided on the side of the jig base 41 close to the press-fitting mechanism 50. The second synchronous tightening member 200 is for self-centering tightening at the position of the spacing section 002.
[0047] The second synchronous tightening member 200 includes an expansion seat 201 detachably fixedly connected to the jig base 41. The expansion seat 201 is cylindrical in shape as a whole, with a through hole in the center, and the through hole is outwardly expanded toward the side of the jig base 41. The outer peripheral surface of this side is provided with a mounting portion 202 connected to the jig base 41, and the outer peripheral surface away from the end of the mounting portion 202 is circumferentially arrayed with multiple through holes 203, and a waist groove 204 for hinged installation is provided in the through hole 203.
[0048] The second synchronous tightening member 200 also includes a second tightening member 205 hingedly arranged in each through hole 203 and an elastic member 206 arranged in the waist groove 204. The elastic member 206 is used to push each second tightening member 205 away from the center by a certain distance, so that when the motor rotor 01 is pushed into the self-centering clamping fixture 40, there is a certain gap between the spacing section 002 and the working surface of each second tightening member 205.
[0049] After installation, each second tightening member 205 partially protrudes from the outer circumference of the extension seat 201 , and the protruding portion has a trigger slope 207 on the side facing the installation portion 202 , and a flip avoidance notch 208 is provided on the side opposite to the trigger slope 207 .
[0050] The power of the second synchronous tightening member 200 comes from the movement of the driving cylinder 411. The driving cylinder 411 pushes the trigger slope 207 toward the end surface of the pressing mechanism 50, so that each second tightening member 205 is displaced toward the center at the same time to clamp the spacing segment 002.
[0051] After the bearing is pressed into one end of the motor rotor 01, the motor rotor 01 needs to be withdrawn. At this time, the diameter of the bearing is much larger than the passage diameter formed by each second tightening member 205. The hinged setting of the second tightening member 205 and the outward expansion through hole and the flip avoidance gap 208 of the expansion seat 201, these three technical features assist the motor rotor 01 to complete the withdrawal. When the bearing touches the second tightening member 205, the second tightening member 205 is inside, the outward expansion through hole provides space for it to flip, and the flip avoidance gap 208 outside also provides space for it to flip, so the motor rotor 01 can be smoothly withdrawn.
[0052] In order to increase the reverse resistance force of the core shaft 02, a resistance rod 63 is set at the center of the actuator 61. When the actuator 61 presses against the driving cylinder 411 and makes all the first tightening members 102 clamp the core winding 03 section, the end face of the resistance rod 63 just touches the end face of the core shaft 02 facing that side, thereby increasing the force points and further dispersing and offsetting the force on the workpiece (rotor) pressure bearing.
[0053] In order to expand the application scope of the device, the resistance rod 63 is arranged to be adjustable in relative position in the propulsion actuator 61, so that it can be used for motor rotors 01 of different sizes and lengths within a certain range, and is further arranged to be threadedly matched with the propulsion actuator 61, and a set screw 06 is arranged in the propulsion actuator 61 to tighten the resistance rod 63, thereby improving the stability of the resistance rod 63.
[0054] In order to enable the opposing support mechanism 60 to also have the function of retracting the motor rotor 01, a pneumatic telescopic member 64 is fixedly arranged on the outer surface close to the working surface of the pushing actuator 61, where the working surface refers to the end surface in contact with the driving cylinder 411, and is used to extend and contract radially to loosen or tighten the iron core shaft 02. When the pressing mechanism 50 completes the pressing of the bearing at one end, the pneumatic telescopic member 64 extends out to tighten the iron core shaft 02, pushing the actuator 61 back, and dragging the motor rotor 01 back to the temporary parking platform 70.
[0055] In order to facilitate the press-fitting of the bearing on the other end face of the motor rotor 01, a turntable 07 is provided, and a temporary parking platform 70 is fixedly provided on the turntable 07. After the press-fitting of the bearing on one end is completed, the support mechanism 60 drags the motor rotor 01 to the temporary parking platform 70, starts the turntable 07 to rotate 180 degrees, and the support mechanism 60 pushes the motor rotor 01 into the self-centering clamping fixture 40 again, and repeats the aforementioned press-fitting steps to complete the press-fitting of the second end.
[0056] In order to smoothly withdraw the motor rotor 01 from the self-centering clamping fixture 40, the driving cylinder 411 is set to automatically rebound and reset when the external force is lost. Figure 6 and Figure 7 The driving cylinder 411 is provided with a contact portion 412 for abutment on at least one side of the corresponding base fixing seat 42, and a receiving hole 421 is provided on the base fixing seat 42 at a position corresponding to the contact portion 412, and an elastic reset member 422 is provided in the receiving hole 421, and the free end of the elastic reset member 422 is in abutment with the contact portion 412. When the driving cylinder 411 is relieved of external force, the elastic reset member 422 helps the driving cylinder 411 to return to the initial position, that is, the first synchronous tightening member 100 and the second synchronous tightening member 200 both loosen the motor rotor 01.
[0057] With reference to all the accompanying drawings, the working method and steps of the motor rotor press-fit bearing device are summarized as follows: S1. Place the motor rotor 01 to be press-fitted with the bearing on a temporary parking platform 70.
[0058] S2. The actuator 61 is pushed by the power source 62 to push the motor rotor 01 into the self-centering clamping fixture 40. The actuator 61 presses the driving cylinder 411 at the same time.
[0059] S3. The driving cylinder 411 drives all the first tightening members 102 and the second tightening members 205 to act simultaneously. All the first tightening members 102 clamp the iron core winding 03 section of the motor rotor 01 in a self-centering manner; at the same time, the second tightening members 205 also move toward the center to clamp the gap section 002. At the same time, the end face of the resistance rod 63 contacts the end face of the iron core shaft 02 facing this side, increasing the force points and further dispersing and offsetting the force on the workpiece (rotor) pressure bearing.
[0060] S4. The pressing mechanism 50 is activated to press a bearing onto one end of the core shaft 02. The actuator 61 keeps the driving cylinder 411 moving forward, which makes the motor rotor 01 have a strong integrity in the above steps, and forms a counteraction with the pressing action of the pressing mechanism 50, offsetting the bearing force of the workpiece (rotor) and preventing the core shaft from tilting and deforming.
[0061] S5. After the bearing is pressed at one end, the pneumatic telescopic member 64 extends out to press the iron core shaft 02, and the push actuator 61 retreats. At the same time, the driving cylinder 411 automatically rebounds and resets when the external force is lost. The first synchronous tightening member 100 and the second synchronous tightening member 200 both release the motor rotor 01, so that the motor rotor 01 can be withdrawn from the self-centering clamping fixture 40. As the push actuator 61 retreats, the motor rotor 01 is dragged out to the temporary parking platform 70 again.
[0062] S6. Start the turntable 07 and rotate it 180 degrees. The support mechanism 60 pushes the motor rotor 01 into the self-centering clamping fixture 40 again, and repeats the aforementioned press-fitting steps to complete the press-fitting of the second end.
[0063] Embodiment 2: This embodiment discloses a motor rotor bearing press-fit detection device. This device is based on the first embodiment, and adds a detection function to detect the press-fit state of the motor rotor bearing to avoid problems such as bearing damage and reduced service life due to improper press-fitting.
[0064] The detection device comprises: a pressure detection mechanism and a displacement detection mechanism arranged at one end of a horizontal base 20.
[0065] The pressure detection mechanism includes a pressure sensor and a pressure support member for supporting and fixing the pressure sensor. The pressure support member is made of flexible material, one end of which has a larger area and is fixed on the horizontal base 20, and the opposite end of which has a smaller area and is provided with a platform for supporting the pressure sensor. The pressure sensor adopts the voltage output mode or the current output mode in the prior art, and outputs the detected pressure signal to the upper control system for decoding and display.
[0066] The displacement detection mechanism includes a displacement sensor and a displacement support for supporting and fixing the displacement sensor. The displacement support is made of rigid material, one end of which has a larger area and is fixed on the horizontal base 20, and the opposite end has a slightly smaller area and is provided with a platform for supporting the displacement sensor. The displacement sensor measures the axial displacement of the fixture base 41 or its support relative to the horizontal base 20, and outputs the detected displacement signal to the upper control system for decoding and display.
[0067] The working principle of the bearing press-fit detection device is as follows: when the driving cylinder 411 drives all the first tightening members 102 and the second tightening members 205 to perform self-centering tightening under the push of the push actuator 61, the pressure detected by the pressure sensor changes from small to large, and the displacement detected by the displacement sensor increases linearly from zero to positive; when the bearing press-fit mechanism 50 starts to press-fit the bearing, the pressure detected by the pressure sensor reaches a peak value, and the displacement sensor also detects the maximum displacement at this time; when the bearing press-fit is completed, the pressure and displacement gradually return to the initial state. The upper control system monitors and analyzes the changing rules of the pressure and displacement detection results, judges the press-fit state of the motor rotor bearing based on this, and issues a reminder or alarm signal when necessary.
[0068] This preferred solution adds a pressure detection mechanism and a displacement detection mechanism on the basis of Example 1, and can monitor the stress and deformation of the motor rotor bearing during the press-fitting process in real time. By analyzing and judging the dynamic change curves of the pressure and displacement detection results, the press-fitting state and quality of the bearing can be accurately grasped, which is conducive to the setting of press-fitting parameters and the control of the press-fitting quality of the bearing. This solution expands the function of Example 1, so that the press-fitting process of the motor rotor bearing can be monitored and controlled in real time, and has high practical value.
[0069] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.
Claims
1. A bearing pressing method using a bearing pressing device for a motor rotor, characterized in that, For the bearing pressing device of the motor rotor, before installing the bearing on the motor rotor, it includes an iron core shaft (02), an iron core winding (03) and a commutator (04). It is characterized in that the bearing pressing device includes a horizontal base (20), a jig mounting base (30) fixed on the horizontal base (20), a self-centering clamping jig (40) fixedly arranged on the jig mounting base (30), a pressing-in mechanism (50) fixedly arranged at one end of the self-centering clamping jig (40), and an opposing support mechanism (60) fixedly arranged at the other end of the self-centering clamping jig (40), and a temporary docking platform (70) fixedly arranged between the opposing support mechanism (60) and the self-centering clamping jig (40); the central axis of the main body of the self-centering clamping jig (40) and the central axes of the working parts of the pressing-in mechanism (50) and the opposing support mechanism (60) are in a horizontal, coincident or collinear state; The self-centering clamping jig (40) includes a jig base body (41) with a cylindrical hollow structure and a plurality of symmetrically arrayed openings on the barrel wall, and a base fixing seat (42) that floats and fixes the jig base body (41) above the jig mounting base (30) with the axis horizontal; At the position where the openings are formed in the jig base body (41), there is a first synchronous tightening member (100) for self-centering and tightening the iron core winding (03); the first synchronous tightening member (100) includes a guiding slot (101) arranged from high to low relative to the central axis along the direction from the opposing support mechanism (60) to the pressing-in mechanism (50) within the wall thickness range of each opening inner wall of the jig base body (41); in each opening of the jig base body (41), a first tightening member (102) that forms a sliding fit with the guiding slot (101) is movably arranged; while slidingly mating with the outer peripheral surface of the jig base body (41), each first tightening member (102) is fixedly connected to a driving cylinder (411); the opposing support mechanism (60) includes an actuator (61) and a power source (62) for pushing the actuator (61); During operation, the motor rotor (01) to be press-fitted with the bearing is placed on the temporary docking platform (70), the actuator (61) is pushed by the power source (62) to push the motor rotor (01) into the self-centering clamping jig (40), and the actuator (61) presses against the driving cylinder (411). The driving cylinder (411) drives all the first tightening members (102) to act simultaneously. All the first tightening members (102) clamp the iron core winding (03) section of the motor rotor (01) in a self-centering manner. The pressing-in mechanism (50) acts to press-fit one bearing onto one end of the iron core shaft (02). At the same time, the actuator (61) keeps the driving cylinder (411) in a forward movement trend, and this trend forms a counteraction with the pressing-in action of the pressing-in mechanism (50), offsetting the workpiece pressing shaft bearing force, thereby avoiding the inclination and deformation of the iron core shaft. The iron core shaft (02) is a stepped shaft, and the bearing mounting parts (001) at both ends have a relatively larger diameter spacing section (002) adjacent to the center side; a step is formed between the spacing section (002) and the bearing mounting part (001), and a second synchronous tightening member (200) is provided on the side of the jig base (41) close to the pressing mechanism (50); The second synchronous tightening member (200) comprises an extension seat (201) detachably fixedly connected to the jig base (41); the extension seat (201) is cylindrical in shape as a whole, has a through hole in the center, and the through hole is outwardly expanded on one side facing the jig base (41); the outer peripheral surface of the side is provided with a mounting portion (202) connected to the jig base (41), and the outer peripheral surface of the end away from the mounting portion (202) is provided with a plurality of through holes (203) arranged in a circular array, and a waist groove (204) for hinged installation is provided in the through hole (203); the second synchronous tightening member (200) also comprises a second tightening member (205) hingedly arranged in each through hole (203), and each second tightening member (205) partially protrudes from the outer peripheral surface of the extension seat (201) after installation; A resistance rod (63) is arranged at the center of the thrust actuator (61), and when the actuator (61) presses against the driving cylinder (411) and all the first tightening members (102) clamp the iron core winding (03) section, the end surface of the resistance rod (63) just contacts the end surface of the iron core shaft (02) facing that end; A pneumatic telescopic member (64) is fixedly provided on an outer surface close to the working surface of the propulsion actuator (61) and is capable of radially extending and contracting the iron core shaft (02); A turntable (07) is fixedly arranged below the temporary parking platform (70); The steps of the bearing press method are: a. Place the motor rotor (01) to be press-fitted with the bearing on a temporary parking platform (70); b. The actuator (61) is driven by the power source (62) to push the motor rotor (01) into the self-centering clamping fixture (40); the actuator (61) simultaneously presses against the drive cylinder (411); c. The driving cylinder (411) drives all the first tightening members (102) and the second tightening members (205) to move simultaneously; all the first tightening members (102) clamp the iron core winding (03) section of the motor rotor (01) in a self-centering manner; at the same time, the second tightening members (205) also move toward the center to clamp the gap section (002); at the same time, the end face of the resistance rod (63) contacts the end face of the iron core shaft (02) facing the side, thereby increasing the force points and further dispersing and offsetting the force on the rotor pressure bearing; d. The pressing mechanism (50) is actuated to press-fit a bearing onto one end of the core shaft (02); the actuator (61) causes the drive cylinder (411) to maintain a forward movement, which in the aforementioned steps enables the motor rotor (01) to have a strong integrity, and forms a counteracting effect with the pressing action of the pressing mechanism (50), thereby offsetting the force exerted by the rotor on the bearing and preventing the core shaft from tilting and deforming; e. After the bearing is pressed at one end, the pneumatic telescopic member (64) extends out of the clamping iron core shaft (02), and the push actuator (61) moves backward. At the same time, the driving cylinder (411) automatically rebounds and resets when the external force is lost. The first synchronous tightening member (100) and the second synchronous tightening member (200) both release the motor rotor (01), so as to facilitate the motor rotor (01) to withdraw from the self-centering clamping fixture (40); the motor rotor (01) is dragged out again to the temporary parking platform (70) as the push actuator (61) moves backward; f. Start the turntable (07) and rotate it 180 degrees; the support mechanism (60) pushes the motor rotor (01) into the self-centering fixture (40) again, and repeats the aforementioned press-fitting steps to complete the press-fitting of the second end.