A method for improving the assembly quality of high-power density motors

Abstract

The present invention belongs to the technical field of motor assembly, and particularly relates to a method for improving the assembly quality of high-power density motors, comprising the following steps: (1) Monitoring the perpendicularity of the bearing positioning step with a gauge block; (2) Hand-held positioning method for hot sleeving the bearing; (3) Axial hammering method for the bearing; (4) Installation and alignment method for the outer ring of the cylindrical bearing; (5) Tightening the bearing housing symmetrically and checking the bearing installation quality by the disk rotation method; (6) Monitoring the clearance between the inner and outer covers and the shaft with a feeler gauge; (7) Four-point symmetric knocking method for the end cover; (8) Disk turning auscultation method. By analyzing the influencing factors of phenomena such as internal rubbing sound of the motor, rubbing of the inner and outer covers against the shaft, shaft movement, large bearing vibration, large body vibration, abnormal bearing sound, and high bearing temperature, the above assembly method is designed, which can achieve the effects of improving the motor assembly quality and extending the service life of the motor.

Description

Technical Field

[0001] The invention belongs to the technical field of motor assembly, and in particular relates to a method for improving the assembly quality of a high-power density motor. Background Art

[0002] With the rapid development of motor technology, the application scope of high power density motors is becoming more and more extensive. The use of large and medium-sized high power density motors is also increasing year by year. This type of motor is welcomed by more and more domestic and foreign customers due to its low center and high output characteristics. This type of motor has high technical requirements and is more difficult to manufacture. The assembly quality of the motor is very critical.

[0003] With the replacement of old and new workers, the technical level of many motor factories and users is declining. After the motor is assembled, there are often internal friction sounds, inner and outer covers rubbing against the shaft, shaft deviation, large bearing vibration, large body vibration, abnormal bearing noise, high bearing temperature and other phenomena, which affect the service life of the motor. Summary of the invention

[0004] The purpose of the present invention is to solve the problems of friction noise, large vibration, bearing noise, high bearing temperature, etc. after the existing high power density motor is assembled, and to provide a method for improving the assembly quality of the high power density motor.

[0005] To achieve the above object, the technical solution adopted by the present invention is: a method for improving the assembly quality of a high power density motor, comprising the following steps:

[0006] (1) Use a gauge block to monitor the verticality of the bearing positioning step before assembling the bearing;

[0007] (2) Hold the bearing part that needs to be heat-fitted, push the inner ring of the bearing tightly with both hands after heat-fitting, and let go after the inner ring of the bearing and the shaft are tightly hugged;

[0008] (3) After the bearing cools to room temperature, add a bakelite block and hammer the inner ring of the bearing to ensure the gap between the bearing and the positioning step;

[0009] (4) Place the inner cover of the bearing on a horizontal platform with the stop facing upward, place the heated bearing sleeve on the inner cover of the bearing, and put the outer ring of the cylindrical bearing into place;

[0010] (5) Use fixing bolts to tighten the bearing chamber symmetrically, and then turn the bearing chamber by hand to ensure that the bearing chamber can rotate freely;

[0011] (6) Use a feeler gauge to check the gap between the inner and outer covers of the bearing and the shaft to prevent the inner and outer covers from rubbing against the shaft when the motor rotates;

[0012] (7) Use a copper hammer to hammer the surface of the end cover symmetrically in a cross shape to eliminate the bearing tension caused by the assembly of the end cover;

[0013] (8) Rotate the rotor of the disc motor. Place a copper tube stethoscope on the bearing housing and the body of the machine. After there is no abnormal noise, install the remaining accessories of the motor.

[0014] Preferably, in step (1), press the gauge block with fingers so that the side of the gauge block abuts tightly against the bearing positioning step, measure the perpendicularity of the bearing positioning step relative to the bearing retaining surface, and ensure that the gap between the gauge block and the bearing positioning step < 0.03 mm.

[0015] Preferably, in step (2), the time for hand-held positioning during the hot fitting of the bearing is not less than 30 - 60S.

[0016] Preferably, in step (3), the gap between the bearing and the positioning step < 0.03 mm.

[0017] Preferably, in step (4), use a clean phenolic block to tap the side of the outer ring of the bearing to ensure that the bearing is properly installed. After the bearing sleeve cools down, use a depth gauge to measure the height difference between the bearing sleeve and the bearing end face. Use a phenolic block in combination with hammering the bearing end face to ensure that the height difference error between the bearing sleeve and the bearing end face ≤ 0.02 mm.

[0018] Preferably, in step (6), the gap between the inner cover, outer cover of the bearing and the rotating shaft ≥ 0.1 mm.

[0019] Preferably, in step (7), first loosen the bolts that fasten the end cover to the machine base and the end cover to the bearing housing, then use a copper hammer to strike the surface of the end cover symmetrically in a cross shape, and the position of the strike is approximately at L / 2 of the end cover size. Finally, symmetrically tighten all the loosened bolts again.

[0020] After adopting the above technical solution, a method for improving the assembly quality of a high power density motor provided by the present invention has the following beneficial effects:

[0021] By analyzing the influencing factors of phenomena such as internal rubbing noise of the motor, rubbing of the inner and outer covers against the shaft, axial movement of the shaft, large bearing vibration, large body vibration, abnormal bearing noise, and high bearing temperature, the present invention designs the above assembly method, which can achieve the effects of improving the assembly quality of the motor and extending the service life of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the present invention for monitoring the perpendicularity of the bearing positioning step by a gauge block;

[0023] Figure 2 It is a schematic diagram of the axial hammering of the bearing of the present invention;

[0024] Figure 3 It is a process flow chart of the present invention;

[0025] Figure 4 It is an external view of the motor of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0026] The present invention will be further clearly and completely described below in conjunction with the accompanying drawings and specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. The description of at least one exemplary embodiment below is actually only illustrative and in no way limits the present invention and its application or use. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0027] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0028] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0029] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal", and "top, bottom" are generally based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description. Without contrary description, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus cannot be construed as limiting the scope of protection of the present invention; the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0030] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0031] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0032] like Figures 1-4 As shown, the present invention provides a method for improving the assembly quality of a high power density motor, comprising the following steps:

[0033] (1) Before assembling the bearing, use a gauge block to monitor the verticality of the bearing positioning step. Specifically, before assembling the bearing, select a gauge block of appropriate specifications and press it against the bearing stop surface with your fingers. The side of the gauge block presses against the bearing positioning step, such as Figure 1 As shown in the figure, measure the verticality of the bearing positioning step relative to the bearing stop surface to ensure that the gap between the gauge block and the positioning step is less than 0.03mm. If any abnormality is found, timely processing can avoid improper bearing assembly due to unqualified stop shoulder verticality, and reduce the probability of bearing vibration and shaft shifting problems.

[0034] (2) Hold the bearing part that needs to be heat-fitted, push the inner ring of the bearing tightly with both hands after heat-fitting, hold and position the inner ring of the bearing for at least 30-60 seconds, and then let go after the inner ring of the bearing and the shaft are tightly held;

[0035] (3) After the bearing cools to room temperature, add a bakelite block and hammer the inner ring of the bearing. Figure 2 As shown in the figure, ensuring the clearance between the bearing and the positioning step is less than 0.03mm can effectively prevent the bearing from being misassembled due to axial shrinkage after the bearing is hot-fitted, and can reduce the probability of bearing vibration and shaft shifting problems.

[0036] (4) Place the bearing inner cover on a horizontal platform with the spigot facing upward, and place the heated bearing sleeve on the bearing inner cover. Fit the outer ring of the cylindrical bearing in place. Specifically, use a clean rubber wood block to tap the side of the outer ring of the bearing to ensure that the bearing is properly fitted. After the bearing sleeve has cooled, use a depth gauge to measure the height difference between the bearing sleeve and the bearing end face. Use a rubber wood block in combination with hammering the bearing end face to ensure that the height difference error between the bearing sleeve and the bearing end face is ≤ 0.02 mm, which can effectively reduce the noise generated during the operation of the cylindrical bearing.

[0037] (5) Symmetrically tighten the bearing housing with fixed bolts to improve the assembly accuracy of the bearing, reduce the probability of abnormal noise, vibration, and high temperature caused by bearing binding. Then, manually rotate the bearing housing to ensure that the bearing housing rotates freely without any sense of blockage. Through the above rotation method, it is possible to effectively avoid bearing binding caused by component quality problems and reduce the probability of abnormal noise, vibration, and high temperature caused by bearing binding.

[0038] (6) Use a feeler gauge to check that the clearance between the bearing inner cover, outer cover, and the rotating shaft is ≥ 0.1 mm to prevent the inner cover and outer cover from rubbing against the shaft during motor rotation. After passing the inspection, install the end covers at both ends of the motor.

[0039] (7) Loosen the bolts that fasten the end cover to the machine base and the end cover to the bearing housing. Use a copper hammer to symmetrically strike the surface of the end cover in a cross pattern, and the striking position is approximately at the L / 2 dimension of the end cover. This can eliminate the bearing binding caused by end cover assembly, and then symmetrically tighten all the loosened bolts again.

[0040] (8) Rotate the motor rotor. Place a copper tube stethoscope on the bearing housing and the body of the machine. This can effectively determine whether there is abnormal noise in the bearing and whether there is rubbing sound inside the motor. If any problems are found, handle them in a timely manner. After there is no abnormal noise, install the remaining accessories of the motor.

[0041] In summary, a method for improving the assembly quality of a high-power density motor provided by the present invention analyzes the influencing factors of phenomena such as internal rubbing sound of the motor, rubbing of the inner and outer covers against the shaft, axial displacement, large bearing vibration, large body vibration, abnormal bearing noise, and high bearing temperature, and designs the above assembly method. When used in the motor assembly process, it can achieve the effects of improving the motor assembly quality and extending the service life of the motor.

[0042] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present invention.

Claims

1. A method for improving the assembly quality of high-power density motors, characterized in that, The following steps are involved: (1) Before the bearing is assembled, use a gauge block to monitor the verticality of the bearing positioning step relative to the bearing stop surface; (2) Hold the bearing part that needs to be heat-fitted, push the inner ring of the bearing tightly with both hands after heat-fitting, and let go after the inner ring of the bearing and the shaft are tightly hugged; (3) After the bearing cools to room temperature, add a bakelite block and hammer the inner ring of the bearing to ensure the gap between the bearing and the positioning step; (4) Place the inner cover of the bearing on a horizontal platform with the stop facing upwards, place the heated bearing sleeve on the inner cover of the bearing, and fit the outer ring of the cylindrical bearing into place. Use a clean bakelite block to knock on the side of the outer ring of the bearing to ensure that the bearing is in place. After the bearing sleeve cools down, use a depth gauge to measure the height difference between the bearing sleeve and the bearing end face. Use a bakelite block to hammer the bearing end face to ensure that the height difference error between the bearing sleeve and the bearing end face is ≤0.02mm; (5) Use fixing bolts to tighten the bearing chamber symmetrically, and then turn the bearing chamber by hand to ensure that the bearing chamber can rotate freely; (6) Use a feeler gauge to check the clearance between the inner and outer covers of the bearing and the shaft to prevent the inner and outer covers from rubbing against the shaft when the motor rotates; (7) Use a copper hammer to hit the surface of the end cover symmetrically in a cross direction to eliminate the bearing tension caused by the assembly of the end cover; (8) Turn the motor rotor and use a copper tube to listen to the sound in the bearing chamber and the body of the motor. When there is no abnormal sound, install the remaining accessories of the motor.

2. The method for improving the assembly quality of high-power density motors according to claim 1, characterized in that: In step (1), the gauge block is pressed with fingers so that the side of the gauge block presses against the bearing positioning step, and the verticality of the bearing positioning step relative to the bearing stop surface is measured to ensure that the gap between the gauge block and the bearing positioning step is less than 0.03 mm.

3. The method for improving the assembly quality of high-power density motors according to claim 1, characterized in that: In the step (2), the time for hand-held positioning of the bearing heat sleeve in the step (2) is not less than 30-60 seconds.

4. The method for improving the assembly quality of high-power density motors according to claim 1, characterized in that: In the step (3), the gap between the bearing and the positioning step is less than 0.03 mm.

5. The method for improving the assembly quality of high-power density motors according to claim 1, characterized in that: In the step (6), the gap between the inner cover and outer cover of the bearing and the rotating shaft is ≥0.1 mm.

6. The method for improving the assembly quality of high-power density motors according to claim 1, characterized in that: In the step (7), first loosen the bolts that connect the end cover to the base and the end cover to the bearing chamber, then use a copper hammer to symmetrically hammer the surface of the end cover in a cross shape, and the hammering position is approximately at the end cover size L / 2, and finally re-tighten all the loosened bolts symmetrically.

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