Press fitting mechanism for assembling rotor core and rotating shaft

Abstract

The utility model provides a press-fitting mechanism for assembling a rotor core and a rotating shaft, and belongs to the technical field of machinery. The problem of how to reduce the rejection rate of rotor iron core and rotating shaft assembly is solved. The press-fitting mechanism for assembling the rotor iron core and the rotating shaft comprises a fixed mold plate and a movable mold plate, the plate surfaces of the fixed mold plate and the movable mold plate are oppositely arranged, the movable mold plate can move towards or back to the fixed mold plate, a press-fitting seat is fixed on the lower side plate surface of the fixed mold plate, a filling seat is fixed on the upper side plate surface of the movable mold plate, and the press-fitting seat is fixed on the lower side plate surface of the movable mold plate. The press-fitting base is connected with a guide sleeve, a port of one end of the guide sleeve faces the filling base, the press-fitting base, the guide sleeve and the filling base are coaxial, and the port of the end, facing the press-fitting base, of the guide sleeve is in a flaring shape. The press-fitting mechanism for assembling the rotor iron core and the rotating shaft can reduce the rejection rate of assembling the rotor iron core and the rotating shaft.

Description

Technical Field

[0001] The utility model belongs to the technical field of machinery and relates to a press-fitting mechanism for assembling a rotor core and a rotating shaft. Background Art

[0002] The rotor is an indispensable part of the motor, which generally includes a rotor core, a rotating shaft, a commutator, etc. The rotor core is formed by punching and stacking several silicon steel sheets. After the rotor core is manufactured, the rotating shaft needs to be installed in the rotor core, and then the windings are arranged in several slots outside the rotor core.

[0003] In the above-mentioned processing and forming steps, the installation of the rotating shaft is a very important link. In the prior art, the installation of the rotating shaft is generally achieved by a hydraulic press. Specifically, the worker installs the rotor core to be assembled in the work station set on the fixed mold of the hydraulic press, and then inserts the rotating shaft into the shaft hole on the rotor core. It is worth mentioning that the shaft hole is divided into two connected front and rear sections, where the aperture of the front section is slightly larger than the outer diameter of the rotating shaft, and the rear half is slightly smaller than the outer diameter of the rotating shaft. The rotating shaft inserted in the shaft hole is limited by the front half of the shaft hole, so that the rotating shaft is in a vertical setting state. Then the hydraulic press is started to move the movable template downward to apply pressure to the upper end of the rotating shaft, thereby moving the rotating shaft downward, ensuring that the outer peripheral wall of the rotating shaft and the inner peripheral wall of the rear half of the shaft hole are clamped, thereby completing the installation of the rotating shaft.

[0004] However, during actual processing, the inner diameter of the front half of the shaft hole cannot completely match the outer diameter of the shaft, so that the shaft inserted in the front half of the shaft hole is in an unaligned state. At this time, if the shaft is directly pressed into place, it is very likely to cause excessive interference between the shaft and the wall of the shaft hole, resulting in cracks in the rotor core, bending or even breakage of the shaft, and a high scrap rate. Summary of the Invention

[0005] The purpose of this utility model is to address the above-mentioned problems in the existing technology and propose a press-fitting mechanism for assembling the rotor core and the rotating shaft. The technical problem to be solved by this utility model is: how to reduce the scrap rate of the rotor core and the rotating shaft assembly.

[0006] The purpose of the utility model can be achieved through the following technical solutions: a press-fitting mechanism for assembling a rotor core and a rotating shaft, comprising a fixed plate and a movable plate with plates arranged opposite to each other, the movable plate being able to move toward or away from the fixed plate, and a press-fitting seat is fixed on the lower plate of the fixed plate, a filling seat is fixed on the upper plate of the movable plate, a guide sleeve with one end port facing the filling seat is connected to the press-fitting seat, and the press-fitting seat, the guide sleeve and the filling seat are coaxial, and the guide sleeve has an end port facing the press-fitting seat in a flared shape.

[0007] The working principle of the press-fitting mechanism for assembling the rotor core and the rotating shaft is as follows: a filling seat for filling the rotor core is provided on the movable plate, and the worker installs the rotor core to be processed in the filling seat, and then inserts the rotating shaft into the rotor core, and limits the rotating shaft by the front half of its shaft hole. After that, the hydraulic cylinder provided under the movable plate and connected to the movable plate works, and the movable plate is driven by the hydraulic cylinder to drive the press-fitting seat to move upward until the press-fitting seat on the fixed plate abuts against the rotating shaft and presses the rotating shaft to clamp into the rotor core (specifically clamped with the rear half of the shaft hole). In this process, the present application arranges the guide sleeve so that when the movable plate moves toward the fixed plate, the end of the rotating shaft facing the fixed plate can first pass through the guide sleeve. In the sleeve, since the port of the guide sleeve facing the movable template is flared, that is, the circumferential inner wall of this end of the guide sleeve is inclined outward, when the end of the rotating shaft contacts the inner wall of the guide sleeve port, the inner wall of the guide sleeve port can provide a guiding effect for the end of the rotating shaft, and make the outer circumferential wall and the inner circumferential wall of the guide sleeve fit together when the rotating shaft is passed through the guide sleeve. The tilt correction of the rotating shaft is achieved by the face-to-face fitting of the two, ensuring that the rotating shaft is completely facing the axial hole in the transfer core. In this state, the press-fit seat applies pressure to the upper end of the rotating shaft to prevent interference between the outer wall of the rotating shaft and the rear half of the inner axial hole of the rotor core, avoid cracking of the rotor core, and prevent the rotating shaft from bending or breaking, effectively reducing the scrap rate.

[0008] In the aforementioned press-fit mechanism for assembling the rotor core and shaft, the press-fit seat is cylindrical and fixed at the center of the lower plate surface of the fixed platen, while the filling seat is fixed at the center of the upper plate surface of the movable platen. A gap is provided between the upper end of the guide sleeve and the bottom of the press-fit seat. This ensures that the plates of the fixed and movable platens are aligned and evenly stressed. Furthermore, the gap between the press-fit seat and the guide sleeve allows the guide sleeve, after being positioned over the shaft, to continue moving downward for a distance before the shaft and press-fit seat abut against each other, thereby ensuring accurate alignment of the entire shaft.

[0009] In the above-mentioned press-fitting mechanism for assembling the rotor core and the rotating shaft, the press-fitting mechanism for assembling the rotor core and the rotating shaft also includes a plurality of bolts. The press-fitting seat has an upper mounting edge along the circumferential direction on the outer side wall at the bottom, and the guide sleeve has a lower mounting edge along the circumferential direction on the outer side wall at the upper end. The upper mounting edge has a plurality of spaced-apart holes along the circumferential direction, and the lower mounting edge has a plurality of spaced-apart threaded holes along the circumferential direction. Each of the spaced-apart holes is opposite to each of the threaded holes. The bolts are passed through the spaced-apart holes and are screwed to the threaded holes. This increases the distance between the guide sleeve and the press-fit seat, thereby increasing the contact amount between the inner circumferential wall of the guide sleeve and the outer circumferential wall of the rotating shaft in the axial direction, thereby ensuring more precise correction of the rotating shaft. In addition, since each bolt is passed through the clearance hole opened by the upper mounting edge, that is, the guide sleeve is limited by the abutment between the bolt head and the upper surface of the upper mounting edge. During the press-fitting process, when the guide sleeve contacts the top of the rotor core, the rotating shaft press-fitting can be completed by the sliding of the bolt in the clearance hole while preventing interference between the guide sleeve and the rotor core.

[0010] In the aforementioned press-fit mechanism for assembling the rotor core and the rotating shaft, each bolt is sheathed with a spring, one end of each spring abutting the upper mounting edge and the other end abutting the lower mounting edge. This ensures that after the movable platen moves downward, the elastic force of the spring drives the guide sleeve to quickly return to its original position.

[0011] In the above-mentioned press-fitting mechanism for assembling the rotor core and the rotating shaft, the upper end of each threaded hole is flared to ensure the convenience of assembling each bolt when disassembling and replacing the guide sleeve.

[0012] Compared with the existing technology, the press-fitting mechanism for assembling the rotor core and the rotating shaft has the following advantages:

[0013] By setting the guide sleeve, the rotating shaft can be first passed through the guide sleeve during processing. Due to the guidance of the lower end port of the guide sleeve, the direction of the rotating shaft is corrected, and the inner circumferential wall of the guide sleeve and the outer circumferential wall of the rotating shaft are fitted together to ensure that the rotating shaft is in a vertical state. It can be pressed into the shaft hole of the rotor core through the press-fitting seat, which effectively reduces the scrap rate caused by the interference between the rotating shaft and the rotor core. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a front view of a press-fitting mechanism for assembling a rotor core and a rotating shaft.

[0015] Figure 2 This is a partial enlarged view of point A in the figure.

[0016] Figure 3 yes Figure 1 Cross-sectional view along AA direction and its partial enlarged view.

[0017] Figure 4 It is a structural diagram of the press-fit seat.

[0018] Figure 5 It is a structural diagram of the guide sleeve.

[0019] In the figure, 1. movable platen; 11. filling seat; 2. fixed platen; 21. press-fit seat; 211. upper mounting edge; 2111. clearance hole; 3. rotor core; 4. rotating shaft; 5. guide sleeve; 51. lower mounting edge; 511. threaded hole; 6. bolt; 61. spring; 7. unloading rod. DETAILED DESCRIPTION

[0020] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0021] like Figure 1-3 As shown, in the pressing mechanism for assembling the rotor core and the rotating shaft, the pressing mechanism includes a fixed template 2 and a movable template 1, the fixed template 2 and the movable template 1 are both arranged horizontally, the fixed template 2 is located directly above the movable template 1, and the movable template 1 is driven by a hydraulic cylinder to move toward or away from the fixed template 2, a filling seat 11 is fixed on the upper side plate surface of the movable template 1, and a pressing seat 21 is fixed on the lower side plate surface of the fixed template 2, in addition, a guide sleeve 5 is vertically arranged and passed through at both ends between the fixed template 2 and the movable template 1, and the guide sleeve 5 is specifically connected to the pressing seat 21, so that the pressing seat 21, the guide sleeve 5 and the filling seat 11 are coaxial. When the worker fills the rotor core 3 into the filling seat 11, the pressing seat 21, the guide sleeve 5 and the rotor core 3 are coaxially arranged.

[0022] Combine Figure 4 and Figure 5 The press-fit seat 21 is specifically cylindrical, and a disc-shaped upper mounting edge 211 is formed on the outer peripheral wall of the bottom plate in the axial direction. A disc-shaped lower mounting edge 51 is formed on the outer wall of the upper end of the guide sleeve 5 in the circumferential direction. Three spaced-apart holes 2111 are opened on the plate surface of the upper mounting edge 211 in the axial direction, and three spaced-apart threaded holes 511 are opened on the plate surface of the lower mounting edge 51 in the circumferential direction. The positions of the spaced-apart holes 2111 on the upper mounting edge 211 and the threaded holes 511 on the lower mounting edge 51 are aligned one by one. Yes, in addition to the above structure, the press-fitting structure also includes three bolts 6, and the three bolts 6 are all passed through the three clearance holes 2111 and are screwed and locked with the three threaded holes 511 in a one-to-one correspondence, so that the head of each bolt 6 abuts against the upper side plate surface of the upper mounting edge 211. At the same time, the locking of each bolt 6 positions the guide sleeve 5 below the press-fitting seat 21, and a spring 61 is sleeved on the outside of each bolt 6, and one end of each spring 61 abuts against the lower side surface of the upper mounting edge 211, and the other end abuts against the upper side surface of the lower mounting edge 51.

[0023] like Figure 3 and Figure 5 As shown, the inner peripheral wall of the lower end of the guide sleeve 5 is tilted outward along the circumferential direction, so that the lower end of the guide sleeve 5 is flared, and the upper end of each threaded hole 511 is flared.

[0024] Working principle: Workers fill the rotor core 3 into the filling seat 11 on the movable plate 1, and then insert the shaft 4 into the shaft hole of the rotor core 3. The shaft hole of the rotor core 3 is divided into two sections, the front section's inner diameter is slightly larger than the outer diameter of the shaft 4, and the rear section's inner diameter is slightly smaller than the outer diameter of the shaft 4. Then the hydraulic press drives the movable plate 1 to drive the filling seat 21 to move upward. As the movable plate 1 continues to rise, the shaft 4 extends from the lower end of the guide sleeve 5 and extends from the upper end. In this process, since the lower end of the guide sleeve 5 is flared, the two are connected. When touched, the guide sleeve 5 can guide the upper end of the rotating shaft 4, so that the upper end of the rotating shaft 4 slides along the inner wall of the lower end port of the guide sleeve 5 until it is vertically set, and then after inserting into the guide sleeve 5, the inner circumferential wall of the guide sleeve 5 and the outer circumferential wall of the rotating shaft 4 are fitted together to maintain the orientation of the rotating shaft 4, and finally the press-fitting seat 21 applies pressure to the upper end of the rotating shaft 4, so that the rotating shaft 4 is clamped with the rear section of the axial hole of the rotor core 3, and then the hydraulic cylinder drives the movable template 1 to move down and reset, and finally the rotor core can be clamped from the filling seat 11 by the robot.

[0025] It is worth mentioning that a bearing plate for lifting the movable template 1 is provided below the movable template 1, and the driving shaft of the hydraulic cylinder is passed through the through hole opened on the bearing plate and connected to the lower side of the movable template 1. The filling seat 11 is specifically sleeve-mounted, and a disc-shaped sliding plate is vertically slidably connected to its interior. Three limiting grooves arranged at intervals along the circumferential direction are provided on the outer wall of the lower end of the filling seat 11, and three positioning parts protruding outward are provided on the outer wall of the sliding plate. The three positioning parts are embedded in the three limiting grooves one by one, and the depth of the limiting grooves is greater than the thickness of the positioning parts. In addition, three unloading rods are vertically slidably connected to the movable template 1. The length of the three unloading rods is greater than the thickness of the movable template 1, and one end thereof The upper end of each unloading rod has a limit protrusion protruding outward along the circumferential direction, and the movable template 1 is provided with a receiving groove arranged around the unloading rod. That is to say, when the lower end of each unloading rod is in contact with the bearing plate, the upper end of the three unloading rods can push the sliding plate to move up, so that the rotor core 3 filled in the filling seat 11 is lifted up by the sliding plate, which is convenient for the robot to grab. When the movable template 1 is pushed up by the hydraulic cylinder, the unloading rod and the bearing plate are separated, and the unloading rod moves downward under the action of gravity, so that the limit protrusion at the upper end is embedded in the receiving groove. At this time, the sliding plate moves downward together with the rotor core 3 to ensure stable loading of the rotor core 3.

[0026] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

[0027] Although this document frequently uses terms such as movable platen 1, fixed platen 2, press-fit seat 21, upper mounting edge 211, clearance hole 2111, rotor core 3, rotating shaft 4, guide sleeve 5, lower mounting edge 51, threaded hole 511, bolt 6, spring 61, and unloading rod 7, the use of other terms is not excluded. These terms are used solely to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitations would be contrary to the spirit of the present invention.

Claims

1. A press-fitting mechanism for assembling a rotor core and a rotating shaft, comprising a fixed plate (2) and a movable plate (1) with plates arranged opposite to each other, wherein the movable plate (1) can move toward or away from the fixed plate (2), and a press-fitting seat (21) is fixed on the lower plate of the fixed plate (2), and a filling seat (11) is fixed on the upper plate of the movable plate (1), characterized in that: The press-fitting seat (21) is connected to a guide sleeve (5) with one end facing the filling seat (11), and the press-fitting seat (21), the guide sleeve (5) and the filling seat (11) are coaxial, and the end of the guide sleeve (5) facing the press-fitting seat (21) is in a flared shape.

2. The press-fitting mechanism for assembling the rotor core and the rotating shaft according to claim 1, characterized in that: The press-fitting seat (21) is columnar and fixed at the center of the lower plate surface of the fixed template (2), the filling seat (11) is fixed at the center of the upper plate surface of the movable template (1), and there is a gap between the upper end of the guide sleeve (5) and the bottom of the press-fitting seat (21).

3. The press-fitting mechanism for assembling the rotor core and the rotating shaft according to claim 1 or 2, characterized in that: The press-fitting mechanism for assembling the rotor core and the rotating shaft further comprises a plurality of bolts (6); the press-fitting seat (21) has an upper mounting edge (211) on the circumferential outer side wall of the bottom, the guide sleeve (5) has a lower mounting edge (51) on the circumferential outer side wall of the upper end, the upper mounting edge (211) is provided with a plurality of spaced-apart holes (2111) on the circumferential upper side, the lower mounting edge (51) is provided with a plurality of spaced-apart threaded holes (511) on the circumferential upper side, each of the spaced-apart holes (2111) is opposite to each of the threaded holes (511), and the bolts (6) are passed through the spaced-apart holes (2111) and are screwed to the threaded holes (511).

4. The press-fitting mechanism for assembling the rotor core and the rotating shaft according to claim 3, characterized in that: A spring (61) is sleeved on the outside of each of the bolts (6), one end of each of the springs (61) is tightly pressed against the upper mounting edge (211), and the other end is tightly pressed against the lower mounting edge (51).

5. The press-fitting mechanism for assembling the rotor core and the rotating shaft according to claim 4, characterized in that: The upper end of each threaded hole (511) is in a flared shape.

Images