Permanent magnet rotor shaft enters rotor embryo frock

Abstract

The utility model belongs to the technical field of motor assembly equipment relates to a kind of permanent magnet rotor shafts into rotor blank tool, comprising: lower base, coaxial locating seat is provided on the workbench of lower base, and locating groove is penetrated through the workbench along radial direction, the locating seat is compatible with rotor blank and is used to carry and position rotor blank, the locating groove is compatible with the lower end of rotor shaft, and its bottom plane forms the press-fitting reference surface matched with the bottom plane of rotor shaft;Upper pressing rod, the upper pressing rod is driven to move downward by power device to press-fit rotor shaft, the upper pressing rod is axially slidably arranged in centering seat, the centering seat is coaxially arranged with locating seat, the upper pressing rod is provided with the press-fitting hole of bottom opening, and the inner diameter of the press-fitting hole is compatible with the upper end outer diameter of rotor shaft.The permanent magnet rotor shaft into rotor blank tool provided by the utility model has the advantages of simple structure, accurate centering and high assembly precision.

Description

Technical Field

[0001] This utility model belongs to the technical field of motor assembly equipment, and relates to a permanent magnet rotor shaft insertion rotor blank tooling. Background Technology

[0002] In the motor manufacturing process, the assembly of permanent magnet rotors is one of the key steps, requiring the rotor shaft to be precisely pressed into the center hole of the rotor blank. Due to the brittleness of permanent magnet materials, traditional press-fitting methods have the following problems: First, the rotor shaft is prone to misalignment during press-fitting, causing the rotor blank to break; second, the transmission path of the press-fitting force is unreasonable, and direct application to the shaft end may cause rotor shaft misalignment or damage to the magnetic core; third, the positioning datum machining accuracy of existing tooling is difficult to guarantee, and part removal is inconvenient, affecting assembly efficiency and quality.

[0003] While some rotor pressing equipment exists in the existing technology, most have complex structures and limited positioning accuracy, particularly in ensuring coaxiality and providing a stable pressing reference surface. Therefore, there is a need for a dedicated tooling for pressing permanent magnet rotor shafts that can achieve high precision, high efficiency, and without damaging the workpiece. Utility Model Content

[0004] This invention addresses the shortcomings of existing technologies by providing a permanent magnet rotor shaft insertion tooling, which has the advantages of simple structure, accurate centering, and high assembly precision.

[0005] To solve the above-mentioned technical problems, the objective of this utility model is achieved through the following technical solution: A permanent magnet rotor shaft-insertion rotor blank tooling includes: The lower base has a coaxial positioning seat and a positioning groove that penetrates the worktable radially. The positioning seat is adapted to the rotor blank and is used to support and position the rotor blank. The positioning groove is adapted to the lower end of the rotor shaft, and its bottom plane forms a press-fit reference surface that matches the bottom plane of the rotor shaft. The upper pressure rod is driven by a power device to move downward to press the rotor shaft. The upper pressure rod is axially slidably disposed in the centering seat. The centering seat and the positioning seat are coaxially disposed. The upper pressure rod is provided with a pressing hole with an opening at the bottom. The inner diameter of the pressing hole is adapted to the outer diameter of the upper end of the rotor shaft. During press fitting, the upper pressure rod passes through the centering seat axially and is fitted onto the rotor shaft. The upper pressure rod then moves downward to complete the press fitting.

[0006] In the aforementioned permanent magnet rotor shaft insertion rotor blank tooling, the positioning seat includes a positioning groove and a positioning boss. The radial dimension of the positioning groove is adapted to the outer diameter of the rotor blank, and the radial dimension of the positioning boss is adapted to the radial dimension of the bottom groove of the rotor blank.

[0007] In the aforementioned permanent magnet rotor shaft insertion rotor blank tooling, the positioning seat is a sunken structure with the worktable plane as the reference, the positioning groove penetrates and divides the positioning seat, and the pressing reference surface of the positioning groove is lower than the bearing plane of the sunken bottom of the positioning seat.

[0008] In the aforementioned permanent magnet rotor shaft-insertion rotor blank tooling, a pair of support rods are provided on the worktable, and the upper end of the support rods is connected to a support frame mounted above the worktable, and the centering seat is mounted on the support frame.

[0009] In the aforementioned permanent magnet rotor shaft insertion rotor blank tooling, the axial dimension of the press-fit hole is greater than the distance between the upper end face of the rotor shaft and the shoulder, and the bottom plane of the upper pressure rod abuts against the shoulder of the rotor shaft to transmit pressure.

[0010] In the aforementioned permanent magnet rotor shaft insertion rotor blank tooling, the upper pressure rod can also use other structures to transmit power. For example, the pressure hole is a blind hole, the axial dimension of the pressure hole is smaller than the distance between the upper end face of the rotor shaft and the shoulder, and the top plane of the blind hole abuts against the upper end face of the rotor shaft to transmit pressure.

[0011] In the aforementioned permanent magnet rotor shaft insertion rotor blank tooling, the side wall of the upper pressure rod is provided with one or more exhaust grooves that extend to the press-fit hole.

[0012] In the aforementioned permanent magnet rotor shaft insertion rotor blank tooling, a coaxial linear bearing or bushing is provided inside the centering seat, and the upper pressure rod passes through the linear bearing or bushing.

[0013] In the aforementioned permanent magnet rotor shaft-insertion rotor blank tooling, the power device is a pneumatic cylinder or a hydraulic cylinder. The pneumatic cylinder or hydraulic cylinder is mounted on a workbench via a frame, and its piston rod is vertically downward and connected to a press-fit sleeve that cooperates with the upper pressure rod.

[0014] Compared with the prior art, this utility model has the following advantages: This invention provides a permanent magnet rotor shaft insertion fixture for rotor blanks. By setting coaxial positioning and centering seats, a double-guided positioning system is formed, ensuring the coaxiality of the rotor shaft and rotor blank during press-fitting and avoiding press-fitting misalignment and rotor blank damage caused by misalignment. Furthermore, the positioning groove of this invention adopts a radially penetrating worktable design. On the one hand, this makes the bottom plane of the positioning groove (press-fitting reference surface) easy to machine, ensuring high flatness and positional accuracy; on the other hand, after press-fitting, the rotor shaft can be removed from the side without needing to move a large distance upwards, saving axial space and facilitating part removal. The permanent magnet rotor shaft insertion fixture for rotor blanks provided by this invention has the advantages of simple structure, accurate centering, and high assembly precision. Attached Figure Description

[0015] Figure 1 This is a perspective view of the present invention; Figure 2 yes Figure 1 Axial sectional view; Figure 3 yes Figure 1 Exploded view; Reference numerals: 1. Lower base; 11. Worktable; 12. Positioning seat; 12a. Positioning groove; 12b. Positioning boss; 13. Positioning slot; 14. Support rod; 15. Support frame; 2. Upper pressure rod; 21. Centering seat; 22. Press-fit hole; 31. Rotor blank; 32. Rotor shaft; 33. Shaft shoulder. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. See also: Figure 1-3 : A permanent magnet rotor shaft-insertion rotor blank tooling includes: The lower base 1 has a coaxial positioning seat 12 and a positioning groove 13 that penetrates the worktable 11 radially. The positioning seat 12 is adapted to the rotor blank 31 and is used to support and position the rotor blank 31. The positioning groove 13 is adapted to the lower end of the rotor shaft 32, and its bottom plane forms a press-fit reference surface that matches the bottom plane of the rotor shaft 32. The positioning seat 12 includes a positioning groove 12a and a positioning boss 12b. The radial dimension of the positioning groove 12a is adapted to the outer diameter of the rotor blank 31, and the radial dimension of the positioning boss 12b is adapted to the radial dimension of the bottom groove of the rotor blank 31.

[0017] The upper pressure rod 2 is driven by a power device to move downward to press the rotor shaft 32. The upper pressure rod 2 is axially slidably disposed in the centering seat 21. The centering seat 21 is coaxially disposed with the positioning seat 12. The upper pressure rod 2 is provided with a pressing hole 22 with an opening at the bottom. The inner diameter of the pressing hole 22 is adapted to the outer diameter of the upper end of the rotor shaft 32.

[0018] During press fitting, the upper pressure rod 2 passes through the centering seat 21 axially and is fitted onto the rotor shaft 32. Its pressure transmission structure is as follows: the axial dimension of the press fitting hole 22 is greater than the distance between the upper end face of the rotor shaft 32 and the shoulder 33. The bottom plane of the upper pressure rod 2 abuts against the shoulder 33 of the rotor shaft 32 to transmit pressure. By transmitting pressure through the shoulder 33, direct contact with the end face of the rotor shaft 32 can be avoided, thus protecting the permanent magnet from damage.

[0019] The pressing process in this embodiment is as follows: The rotor blank 31 is placed on the positioning seat 12 of the lower base 1. Specifically, the outer circle of the rotor blank 31 is radially positioned by the positioning groove 12a, and its bottom recess is fitted onto the positioning boss 12b, thereby achieving precise constraint of the rotor blank 31 in the horizontal and axial directions. At this time, the bottom of the rotor blank 31 is reliably supported by the bearing plane of the positioning seat 12. The rotor shaft 32 to be pressed is initially placed in the center hole of the rotor blank 31. The upper pressure rod 2 is passed through the centering seat 21 and inserted downwards into the rotor shaft 32 until its bottom plane abuts against the shoulder 33 of the rotor shaft 32, completing the loading.

[0020] The power unit (such as a cylinder or hydraulic cylinder) is activated, and its actuator, after contacting the upper pressure rod 2 at its bottom, drives it to move downwards. As the upper pressure rod 2 descends, its pressure is transmitted through the bottom plane of the upper pressure rod 2 to the shoulder 33, completely avoiding direct pressure on the top of the rotor shaft 32 or the brittle rotor blank 31. Under the action of pressure, the rotor shaft 32 is smoothly and vertically pressed into the center hole of the rotor blank 31. During this process, the upper and lower double guide systems (the positioning groove 13 at the lower end and the centering seat 21 at the upper end) work together to maximize the coaxiality of the rotor shaft 32 and the hole of the rotor blank 31, effectively preventing jamming or core breakage due to misalignment. When the lower end of the rotor shaft 32 contacts the pressing reference surface, the pressing is in place. The power unit is reset, the operator removes the upper pressure rod 2, lifts the pressed workpiece until the bottom of the rotor blank 31 exceeds the plane of the worktable 11, and removes it from the side.

[0021] In this embodiment, the positioning seat 12 is a sunken structure with the worktable 11 plane as the reference. The positioning groove 13 penetrates and divides the positioning seat 12. The pressing reference surface of the positioning groove 13 is lower than the bearing plane of the sunken bottom of the positioning seat 12.

[0022] In this embodiment, the centering seat 21 is specifically implemented as follows: a pair of support rods 14 are provided on the workbench 11, and the upper end of the support rods 14 is connected to a support frame 15 mounted above the workbench 11. The centering seat 21 is mounted on the support frame 15.

[0023] Furthermore, the side wall of the upper pressure rod 2 is provided with one or more exhaust grooves that extend to the press-fit hole 22. When the upper pressure rod 2 is fitted in, the air in the press-fit hole 22 can be smoothly discharged to prevent the formation of an air cushion effect.

[0024] Preferably, the centering seat 21 is provided with a coaxial linear bearing or bushing, and the upper pressure rod 2 passes through the linear bearing or bushing.

[0025] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.

Claims

1. A tooling for inserting a permanent magnet rotor shaft into a rotor blank, characterized in that, include: The lower base (1) has a coaxial positioning seat (12) and a positioning groove (13) that penetrates the worktable (11) radially on the worktable (11). The positioning seat (12) is adapted to the rotor blank (31) and is used to support and position the rotor blank (31). The positioning groove (13) is adapted to the lower end of the rotor shaft (32), and its bottom plane forms a press-fit reference surface that matches the bottom plane of the rotor shaft (32). The upper pressure rod (2) is driven by a power device to move downward to press the rotor shaft (32). The upper pressure rod (2) is axially slidably disposed in the centering seat (21). The centering seat (21) is coaxially disposed with the positioning seat (12). The upper pressure rod (2) is provided with a pressing hole (22) with an open bottom. The inner diameter of the pressing hole (22) is adapted to the outer diameter of the upper end of the rotor shaft (32). During press fitting, the upper pressure rod (2) passes through the centering seat (21) axially and is fitted onto the rotor shaft (32). The upper pressure rod (2) moves downward to complete the press fitting.

2. The permanent magnet rotor shaft insertion tooling according to claim 1, characterized in that, The positioning seat (12) includes a positioning groove (12a) and a positioning boss (12b). The radial dimension of the positioning groove (12a) is adapted to the outer diameter of the rotor blank (31), and the radial dimension of the positioning boss (12b) is adapted to the radial dimension of the bottom groove of the rotor blank (31).

3. The permanent magnet rotor shaft insertion tooling according to claim 2, characterized in that, The positioning seat (12) is a sunken structure with the worktable (11) plane as the reference. The positioning groove (13) penetrates and divides the positioning seat (12). The pressing reference surface of the positioning groove (13) is lower than the bearing plane of the sunken bottom of the positioning seat (12).

4. The permanent magnet rotor shaft insertion tooling according to claim 1, characterized in that, A pair of support rods (14) are provided on the workbench (11). The upper end of the support rods (14) is connected to a support frame (15) mounted on the workbench (11). The centering seat (21) is mounted on the support frame (15).

5. The permanent magnet rotor shaft insertion tooling according to claim 1, characterized in that, The axial dimension of the press hole (22) is greater than the distance between the upper end face of the rotor shaft (32) and the shoulder (33). The bottom plane of the upper pressure rod (2) abuts against the shoulder (33) of the rotor shaft (32) to transmit pressure.

6. The permanent magnet rotor shaft insertion tooling according to claim 1, characterized in that, The side wall of the upper pressure rod (2) is provided with one or more exhaust grooves that extend to the press-fit hole (22).

7. The permanent magnet rotor shaft insertion rotor blank tooling according to claim 1, characterized in that, The centering seat (21) is provided with a coaxial linear bearing or bushing, and the upper pressure rod (2) passes through the linear bearing or bushing.

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