A device for press-fitting a bearing on a rotor of a permanent magnet motor

Abstract

The utility model discloses a kind of devices of permanent magnet motor rotor press fitting bearing, including sleeve, inside can accommodate rotor shaft, rotor shaft sleeve has upper bearing, lower bearing;Magnetic steel positioning block, by screw and sleeve movable assembly, screw is along the radial setting of sleeve, magnetic steel positioning block is C-shaped, two magnetic steel positioning blocks embrace rotor shaft;Upper pressure head, from the upper end of sleeve enters;Base, with the bottom end assembly of sleeve;Press fitting power component, pressure is exerted to upper pressure head;Wherein, the bottom of upper pressure head can resist upper bearing, base can resist lower bearing.Using this utility model through sleeve, magnetic steel positioning block, upper pressure head and the cooperative positioning of base, without relying on rotor outside circle, effectively fine-tuning and guaranteeing the press fitting concentricity of rotor shaft and bearing, avoid bruise or press fitting not in place.

Description

Technical Field

[0001] This utility model relates to the field of motor processing, specifically to a device for press-fitting bearings on a permanent magnet motor rotor. Background Technology

[0002] Permanent magnet synchronous motors are currently widely used, expanding from brushless motors to servo motors, leading to the development of various rotor structures. While some rotors continue to use the concentric magnet design of brushless motors, many employ eccentric magnets. This structure makes it difficult to guarantee accuracy when press-fitting bearings in devices that rely on the rotor's outer diameter for positioning, or results in insufficient operational stability, easily leading to bearing damage or improper press-fitting.

[0003] Some manufacturers choose to customize dedicated bearing press-fitting equipment. This type of equipment can effectively avoid concentricity problems, but it is usually expensive, and the fixtures must be changed when assembling multiple types of bearings, making the operation more cumbersome for situations with a wide variety of bearings.

[0004] Other manufacturers produce simple bearing press heads, but most of them lack a reasonable concentric positioning structure or have unscientific positioning methods, and require a high level of skill and standardization from the workers.

[0005] Currently, the main methods for assembling bearings on motor rotors include horizontal counterweight and vertical counterweight. Horizontal counterweight uses the outer circle of the rotor for center positioning, but since the magnets of permanent magnet motor rotors are often eccentrically shaped like bread loaves, positioning with the outer circle cannot completely guarantee concentricity. Vertical counterweight equipment usually needs to be designed as a general-purpose type, and the price is often as high as tens of thousands of yuan, with fully automatic models even costing hundreds of thousands of yuan, making it unsuitable for small and medium-sized production lines. Utility Model Content

[0006] The problem to be solved by this utility model is to provide a device for press-fitting bearings on the rotor of a permanent magnet motor.

[0007] To solve the above problems, this utility model provides a device for press-fitting bearings for permanent magnet motor rotors. To achieve the above objectives, the technical solution adopted by this utility model to solve its technical problems is as follows:

[0008] A device for press-fitting bearings onto a permanent magnet motor rotor includes: a sleeve capable of accommodating a rotor shaft, the rotor shaft being fitted with an upper bearing and a lower bearing; magnetic positioning blocks movably assembled to the sleeve by screws, the screws being arranged radially along the sleeve, the magnetic positioning blocks being C-shaped, and two magnetic positioning blocks encircling the rotor shaft; an upper pressure head entering from the upper end of the sleeve; a base assembled to the bottom end of the sleeve; and a press-fitting power assembly applying pressure to the upper pressure head; wherein the bottom of the upper pressure head can abut against the upper bearing, and the base can abut against the lower bearing.

[0009] As a further improvement of this utility model, the sleeve includes an integral upper annular portion, a longitudinal portion, and a lower annular portion from top to bottom, with a hollow window formed between adjacent longitudinal portions, and the longitudinal portion having an internal threaded hole for movable assembly with a screw.

[0010] As a further improvement of this utility model, the base has an integral axial portion and a flange portion, the axial portion being able to enter the interior of the sleeve, and the diameter of the flange portion being larger than the diameter of the sleeve.

[0011] As a further improvement of this utility model, the base has a first axial hole at its axis and a first recess at its top, the bottom surface and sidewall of the first recess being able to contact the lower bearing; the upper pressure head has a second axial hole at its axis and a second recess at its bottom, the bottom surface and sidewall of the second recess being able to contact the upper bearing.

[0012] As a further improvement of this utility model, magnetic rings are fixed on the bottom surface of the first recess and the bottom surface of the second recess.

[0013] As a further improvement of this utility model, the center angle of the C-shaped trajectory of the magnetic steel positioning block is less than 170° and greater than 120°.

[0014] As a further improvement of this utility model, the press-fitting power assembly includes a gantry frame composed of a tooling column and a tooling support plate. A linear power cylinder is vertically mounted on the tooling support plate. The output rod of the linear power cylinder is fixed with a movable pressure plate. The movable pressure plate can apply pressure to the upper press head. The tooling column moves through the movable pressure plate.

[0015] As a further improvement of this utility model, the bottom of the tooling column is fixed with a tooling base plate, the sleeve is placed on the tooling base plate, a limiting plate is fixed on the tooling base plate, and one side edge of the limiting plate has a concave curved notch, which can fit with the edge of the base.

[0016] As a further improvement of this utility model, the linear power cylinder is a linear air cylinder.

[0017] As a further improvement of this utility model, the sleeve is made of 304 stainless steel, the upper pressure head and the base are made of carbon steel, and the magnetic positioning block is made of aluminum alloy.

[0018] The beneficial technical effects of the device for press-fitting a permanent magnet motor rotor bearing according to this application are:

[0019] The rotor shaft is accommodated by a sleeve, and the rotor shaft is surrounded by a C-shaped magnet positioning block. With the bottom of the upper pressure head abutting against the upper bearing and the base abutting against the lower bearing, the components can form a coordinated positioning without relying on the outer circle of the rotor for positioning. This effectively ensures the concentricity of the rotor shaft and bearing during press-fitting and avoids problems such as bearing damage or incomplete press-fitting due to positioning deviation.

[0020] The core components of the device include only a sleeve, a magnetic positioning block, an upper pressure head, a base, and a pressing power assembly. The structure is simple and does not require the design of complex general-purpose equipment or customized special fixtures, making it easy to process and manufacture.

[0021] During the press fitting process, the rotor shaft can be directly placed inside the sleeve and quickly positioned by the magnetic positioning block, allowing for radial fine-tuning of its position.

[0022] Finally, a bearing press-fitting device that requires no external positioning is provided. Through the positioning of components within the device, concentricity during press-fitting is ensured, preventing damage to the bearing. It requires no complex equipment, is easy to manufacture, inexpensive, and offers high press-fitting efficiency. It allows for stable and efficient press-fitting of permanent magnet rotor bearings at a relatively low cost. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a perspective view of one embodiment of the present utility model;

[0025] Figure 2 This is a longitudinal sectional view of one embodiment of the present invention;

[0026] Figure 3 This is a perspective view of one embodiment of the present invention.

[0027] 1-Base; 11-First recess; 12-First axial hole; 2-Upper pressure head; 21-Second recess; 22-Second axial hole; 3-Sleeve; 31-Upper annular part; 32-Longitudinal part; 33-Lower annular part; 34-Hollow window; 4-Rotor assembly; 41-Rotor shaft; 42-Upper bearing; 43-Lower bearing; 5-Magnetic positioning block; 71-Pressure head magnetic ring; 72-Base magnetic ring; 8-Screw; 201-Tooling base plate; 202-Tooling column; 203-Tooling support plate; 204-Linear power cylinder; 205-Modible pressure plate; 206-Limiting plate; 2061-Concave curved surface notch. Detailed Implementation

[0028] The present invention will be further described in detail below with reference to specific embodiments:

[0029] To achieve the purpose of this utility model, a device for press-fitting bearings for a permanent magnet motor rotor includes: a sleeve 3, which can accommodate a rotor assembly 4. The rotor assembly includes a rotor shaft 41 and bearings. The rotor shaft 41 is fitted with bearings, including an upper bearing 42 and a lower bearing 43. The upper bearing 42 is the front bearing, and the lower bearing 43 is the rear bearing. Magnet positioning blocks 5 are movably assembled to the sleeve 3 by screws 8. The screws 8 are arranged radially along the sleeve 3. The magnet positioning blocks 5 are C-shaped, and the two magnet positioning blocks 5 encircle the rotor shaft 41. An upper pressure head 2 enters from the upper end of the sleeve 3. A base 1 is assembled to the bottom end of the sleeve 3. A press-fitting power assembly applies pressure to the upper pressure head 2. The bottom of the upper pressure head 2 can abut against the upper bearing 42, and the base 1 can abut against the lower bearing 43.

[0030] Figure 2 At the same time Figure 3 A longitudinal sectional view based on the base.

[0031] To clearly demonstrate the structure of sleeve 3, etc. Figure 2 and Figure 3 compared to Figure 1 , Figure 2 and Figure 3 The press-fit power unit was concealed.

[0032] The beneficial effects of adopting the above technical solution are: by using the sleeve 3 to accommodate the rotor shaft 41 and the C-shaped magnet positioning block 5 to hug the rotor shaft 41, and with the structure of the upper pressure head 2 abutting against the upper bearing 42 and the base 1 abutting against the lower bearing 43, the coordinated positioning of each component is achieved, which effectively ensures the concentricity of the press-fitting of the rotor shaft 41 and the bearing, and avoids bearing damage or incomplete press-fitting due to positioning deviation.

[0033] like Figure 3 As shown, in some other embodiments of the present invention, the sleeve 3 includes an integral upper annular portion 31, a longitudinal portion 32, and a lower annular portion 33 from top to bottom, with a hollow window 34 formed between adjacent longitudinal portions 32, and the longitudinal portion 32 having an internal threaded hole for movably assembling with the screw 8.

[0034] In addition, one end of the screw 8 forms a rotatable shaft connection with the magnet positioning block 5.

[0035] The beneficial effects of adopting the above technical solution are: the sleeve 3 adopts an integrated upper annular part 31, longitudinal part 32 and lower annular part 33 structure, and a hollow window 34 is formed between adjacent longitudinal parts 32, which not only reduces the overall weight, but also facilitates observation and operation.

[0036] In some other embodiments of this utility model, the base 1 has an integral axial portion and a flange portion, the axial portion can enter the interior of the sleeve 3, and the diameter of the flange portion is larger than the diameter of the sleeve 3.

[0037] The beneficial effects of adopting the above technical solution are: the base 1 is designed as an integral axial part and flange part, the axial part can enter the sleeve 3 to achieve positioning, and the flange part has a larger diameter than the sleeve 3, providing stable bottom support.

[0038] In some other embodiments of this utility model, the base 1 has a first axial hole 12 at its axis, and the top of the base 1 has a first recess 11, the bottom surface and sidewall of the first recess 11 being able to contact the lower bearing 43. The upper pressure head 2 has a second axial hole 22 at its axis, and the bottom of the upper pressure head 2 has a second recess 21, the bottom surface and sidewall of the second recess 21 being able to contact the upper bearing 42.

[0039] The beneficial effects of adopting the above technical solution are: the base 1 is provided with a first axial hole 12 and a first recess 11, and the upper pressure head 2 is provided with a second axial hole 22 and a second recess 21, which respectively contact the lower bearing 43 and the upper bearing 42, so as to achieve precise positioning and support of the inner ring of the bearing and avoid damage to the outer ring of the bearing during pressing.

[0040] In some other embodiments of this utility model, magnetic rings are fixed to the bottom surface of the first recess 11 and the bottom surface of the second recess 21.

[0041] The magnetic ring includes a pressure head magnetic ring 71 fixed to the upper pressure head 2, and a base magnetic ring 72 fixed to the base 1. Figure 2 The intermediate pressure head magnetic ring 71 is glued to the groove of the upper pressure head 2, the base magnetic ring 72 is glued to the groove of the base 1, and the magnet positioning block 5 is fixed to the inner wall of the sleeve 3 by screws.

[0042] The beneficial effects of adopting the above technical solution are: fixing the base magnetic ring 72 and the pressure head magnetic ring 71 on the bottom surface of the first recess 11 and the second recess 21 respectively can attract the bearing and prevent it from shifting or falling off during the pressing process.

[0043] In some other embodiments of this utility model, the center angle of the C-shaped trajectory of the magnetic positioning block 5 is less than 170° and greater than 120°.

[0044] The beneficial effects of adopting the above technical solution are: the central angle of the C-shaped trajectory of the magnetic steel positioning block 5 is controlled between 120° and 170°, which can effectively surround the rotor shaft 41 to achieve stable positioning, while retaining enough opening to facilitate rotor insertion and adjustment, thus taking into account both positioning reliability and operational convenience.

[0045] In some other embodiments of this utility model, the press-fitting power assembly includes a gantry frame composed of a tooling column 202 and a tooling support plate 203. The tooling support plate 203 is vertically mounted with a linear power cylinder 204. The output rod of the linear power cylinder 204 is fixed with a movable pressure plate 205. The movable pressure plate 205 can apply pressure to the upper press head 2. The tooling column 202 moves through the movable pressure plate 205.

[0046] Figure 1 The tooling column 202 is fixed to the tooling base plate 201 by bottom screws, the tooling support plate 203 is fixed to the other end of the column, the cylinder 204 is fixed to the tooling support plate 203 by bottom screws, the movable pressure plate 205 passes through the column and is fixed to the cylinder output shaft end, and the limit plate 206 is fixed to the base plate by screws.

[0047] In another embodiment, the rear bearing 43 is placed in the groove of the base 1, with the support surface only supporting the inner ring of the bearing. The outer ring of the bearing is a recessed groove, and a base magnetic ring 72 made of neodymium iron boron magnet is embedded in the recessed groove. Similarly, the front bearing 42 is placed in the groove of the upper pressure head 2, supporting only the inner ring of the bearing. A neodymium iron boron magnet, i.e., the pressure head magnetic ring 71, is also embedded in the recessed groove. The outer diameter of the magnet positioning block 5 is the same as the inner diameter of the sleeve 3. After being fixed with screws, they are concentric. The inner diameter is slightly larger than the rotor assembly, so that it can be smoothly inserted.

[0048] The advantages of adopting the above technical solution are: concentric pressing of the front and rear bearings of the rotor can be completed without complicated operations, while ensuring pressing efficiency. The pressing power assembly adopts a gantry structure composed of tooling column 202 and tooling support plate 203, and in conjunction with linear power cylinder 204 and movable pressure plate 205, it can apply uniform and stable axial pressure to the upper pressure head 2, ensuring a smooth and reliable pressing process.

[0049] In some other embodiments of this utility model, the bottom of the tooling column 202 is fixed with a tooling base plate 201, the sleeve 3 is placed on the tooling base plate 201, and a limiting plate 206 is fixed on the tooling base plate 201. One side edge of the limiting plate 206 has a concave curved notch 2061, which can fit with the edge of the base 1.

[0050] The beneficial effects of adopting the above technical solution are: the tooling base plate 201 is provided with a limiting plate 206 with a concave curved notch 2061, which can fit with the edge of the base 1 to realize the rapid positioning and limiting of the base 1, and improve the consistency of the whole machine assembly and the operating efficiency.

[0051] In some other embodiments of this utility model, the linear power cylinder 204 is a linear air cylinder.

[0052] The beneficial effects of adopting the above technical solution are: the linear power cylinder 204 is a linear cylinder, which has a simple structure, is easy to control, and has low cost, and is suitable for frequent pressing operations in small and medium-sized production lines.

[0053] In some other embodiments of this utility model, the sleeve 3 is made of 304 stainless steel, the upper pressure head 2 and the base 1 are made of carbon steel, and the magnet positioning block 5 is made of aluminum alloy.

[0054] In addition, the base 1 and the upper pressure head 2 are made of ordinary carbon steel with a hardness of HRC50-55.

[0055] All embedded components must be chamfered.

[0056] The beneficial effects of adopting the above technical solution are as follows: the sleeve 3 is made of 304 stainless steel, which is rust-proof and durable; the upper pressure head 2 and the base 1 are made of carbon steel with quenching treatment to ensure hardness and wear resistance; the magnetic positioning block 5 is made of aluminum alloy to reduce weight and avoid interference with other magnets. The selection of materials for each component takes into account functionality, economy and service life.

[0057] In another embodiment, the sleeve 3 is clearance-fitted with the base 1 and the upper pressure head 2, with a tolerance of 0.05-0.20mm depending on the size of the bearing.

[0058] The operating steps of the device for pressing bearings onto a permanent magnet motor rotor according to this application are as follows: First, place the sleeve 3 on the base 1, remove the bearing 43 and slide it into the groove through the opening of the sleeve 3, then insert the rotor shaft 41 from the upper end of the sleeve 3 until the shaft contacts the lower bearing 43. Next, place the upper bearing 42 into the groove of the upper pressure head 2. Due to the presence of a strong magnet, the bearing is attracted to the upper pressure head 2. Invert the upper pressure head 2 along with the bearing into the sleeve 3 until the front bearing 42 contacts the rotor shaft 41. Then, push the entire fixture into the groove of the limit plate 206 of the pneumatic pressure device, and activate the solenoid valve switch of the pneumatic pressure device to complete the pressing.

[0059] This application discloses a simple and practical device for press-fitting bearings onto permanent magnet motor rotors. It solves the bearing assembly problem for non-concentric circular rotors, reduces labor intensity, improves production efficiency, and ensures product quality. Furthermore, this device has low manufacturing costs and is easy to implement, making it suitable for widespread application in the production processes of small and medium-sized motor enterprises.

[0060] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it. They should not be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the protection scope of this utility model.

Claims

1. A device for press-fitting a bearing onto a permanent magnet motor rotor, characterized in that, include: A sleeve, the interior of which can accommodate a rotor shaft, the rotor shaft being fitted with an upper bearing and a lower bearing; The magnetic positioning blocks are movably assembled with the sleeve by screws. The screws are arranged radially along the sleeve. The magnetic positioning blocks are C-shaped, and two magnetic positioning blocks encircle the rotor shaft. The upper pressure head enters from the top of the sleeve; The base is assembled with the bottom end of the sleeve; Press-fit power components to apply pressure to the upper pressure head; The bottom of the upper pressure head can abut against the upper bearing, and the base can abut against the lower bearing.

2. The apparatus for press-fitting a permanent magnet motor rotor bearing according to claim 1, characterized in that: The sleeve comprises an integral upper annular portion, a longitudinal portion, and a lower annular portion from top to bottom, with a perforated window formed between adjacent longitudinal portions, and the longitudinal portion having an internal threaded hole for movable assembly with a screw.

3. The apparatus for press-fitting a permanent magnet motor rotor bearing according to claim 1, characterized in that: The base has an integral axial portion and a flange portion. The axial portion can enter the interior of the sleeve, and the diameter of the flange portion is larger than the diameter of the sleeve.

4. The apparatus for press-fitting a permanent magnet motor rotor bearing according to claim 1, characterized in that: The base has a first axial hole at its axis and a first recess at its top. The bottom surface and sidewalls of the first recess can contact the lower bearing. The upper pressure head has a second axial hole at its axis and a second recess at its bottom. The bottom surface and sidewall of the second recess can contact the upper bearing.

5. The apparatus for press-fitting a permanent magnet motor rotor bearing according to claim 4, characterized in that: A magnetic ring is fixed to the bottom surface of the first recess and the bottom surface of the second recess.

6. The apparatus for press-fitting a permanent magnet motor rotor bearing according to claim 1, characterized in that: The central angle of the C-shaped trajectory of the magnetic positioning block is less than 170° and greater than 120°.

7. The apparatus for press-fitting a permanent magnet motor rotor bearing according to claim 1, characterized in that: The press-fitting power assembly includes a gantry frame composed of a tooling column and a tooling support plate. A linear power cylinder is vertically mounted on the tooling support plate. The output rod of the linear power cylinder is fixed to a movable pressure plate. The movable pressure plate can apply pressure to the upper press head. The tooling column moves through the movable pressure plate.

8. The apparatus for press-fitting a permanent magnet motor rotor bearing according to claim 7, characterized in that: The bottom of the tooling column is fixed with a tooling base plate. The sleeve is placed on the tooling base plate. A limit plate is fixed on the tooling base plate. One side edge of the limit plate has a concave curved notch. The concave curved notch can fit with the edge of the base.

9. The apparatus for press-fitting a permanent magnet motor rotor bearing according to claim 7, characterized in that: The linear power cylinder is a linear cylinder.

10. The apparatus for press-fitting a permanent magnet motor rotor bearing according to claim 1, characterized in that: The sleeve is made of 304 stainless steel, the upper pressure head and the base are made of carbon steel, and the magnetic positioning block is made of aluminum alloy.

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