Press fitting device for flat key of motor rotating shaft

Abstract

The utility model provides a motor rotating shaft flat key press-fitting device, which comprises a press-fitting frame sleeved with a rotating shaft of a motor, and one end of the inner side of the press-fitting frame abuts against the rotating shaft; the pressing block is arranged in the pressing frame; the bolt is in threaded connection with the press-fitting frame, the threaded end of the bolt drives the pressing block to move, and the flat key is pressed into the key groove; a flexible cushion block is detachably clamped in the press-fitting frame; the cushion block is provided with a concave arc-shaped surface; the arc-shaped surface is attached to the position of the rotating shaft back to the key slot. After the pressing block and the key groove are aligned, accurate pressing-in of the flat key is achieved through controllable thread feeding, flat key inclination or key groove damage caused by traditional knocking is avoided, the consistency of installation quality is good, and the connection reliability of motor transmission parts is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to a motor shaft mounting key, specifically a motor shaft key press-fitting device. Background Technology

[0002] In motor assembly, the flat key is a crucial component connecting the motor shaft to couplings, pulleys, or other drive parts. Traditional flat key installation typically involves hammering it into the keyway, but this method has the following drawbacks:

[0003] 1. The impact force generated by the knocking will be directly transmitted to the motor bearing, causing deformation of the bearing raceway or cage, reducing the bearing life or even causing premature failure.

[0004] 2. External impacts may cause the motor shaft to shift, affecting the coaxiality of the shaft, bearings, and end covers, thereby increasing operating vibration and noise.

[0005] 3. Tapping may damage the original dynamic balance of the motor shaft.

[0006] Currently, the industry lacks effective solutions to the above problems. Some processes use the thermal expansion and contraction method of heating the flat key or freezing the shaft, but these are complex to operate and subject to environmental limitations. Therefore, there is an urgent need to develop a technology that can achieve precise installation of flat keys without impact force, in order to ensure the assembly quality and operational reliability of the motor. Utility Model Content

[0007] To address the technical problems in the background art, this utility model discloses a motor shaft flat key press-fitting device.

[0008] This utility model provides a motor shaft flat key press-fitting device, comprising:

[0009] A press-fit frame is fitted onto the motor shaft, with one end of its inner side abutting against the shaft.

[0010] Pressure block, set inside the pressing frame;

[0011] Bolts are threadedly connected to the press-fit frame, and their threaded ends drive the pressure block to move, pressing the flat key into the keyway.

[0012] The press-fit frame contains flexible pads that can be detachably snapped in place;

[0013] The pad has a recessed arc-shaped surface;

[0014] The curved surface fits into the position of the keyway opposite to the shaft.

[0015] Furthermore, the pad has symmetrical, oppositely curved protruding retaining plates on both sides; the retaining plates form a limiting groove that engages with the press-fit frame.

[0016] Furthermore, a screw is provided on the side of the pad facing away from the arc-shaped surface; the screw passes through the press frame; the nut abuts against the outer side of the press frame and is threadedly connected to the screw.

[0017] Furthermore, the pressure block is provided with a slot, and the outer area of ​​the flat key that connects to the keyway engages with the slot.

[0018] Furthermore, the pressing frame is provided with sliding grooves on both sides; a movable block is provided inside the pressing frame; the movable block is movably connected to the threaded end of the bolt, and both ends of the movable block are engaged in the sliding groove; the pressing block is engaged with the movable block.

[0019] Furthermore, the two ends of the movable block are provided with snap-fit ​​posts that are elastically connected by springs; the snap-fit ​​posts snap into the sliding groove.

[0020] Furthermore, the movable block is provided with a non-circular positioning hole; the pressure block is provided with a positioning rod that conforms to the positioning hole and engages with the positioning hole.

[0021] Furthermore, magnets are also attached to the movable block to attract and press the block.

[0022] Furthermore, the movable block has recessed grooves at both ends; the spring is inserted into the groove; the movable block has cover plates at both ends; the cover plates have limiting rings that protrude inward toward the groove; one end of the locking post is located in the groove and connected to the spring, and the other end protrudes outward from the cover plate; the outer wall of the locking post has radial protrusions and locking rings that engage the limiting rings.

[0023] The beneficial effects of this utility model are:

[0024] 1. The progressive pressing method using bolt-driven pressure blocks completely avoids the impact force generated by traditional hammering, preventing the bearing raceway and cage from deforming due to impact, significantly extending the bearing's service life, and eliminating early failure caused by installation.

[0025] 2. During the pressing process, the shaft is evenly supported by the curved surface of the flexible pad, avoiding the risk of axial displacement; moreover, the choice of pad material can protect the shaft from wear.

[0026] 3. The design of the detachable pad allows this invention to be applied to shafts of different diameters simply by replacing the pad with a different model.

[0027] 4. After the pressure block and keyway are aligned, the flat key is precisely pressed in through a controllable thread feed, avoiding the flat key misalignment or keyway damage caused by traditional hammering. This ensures good installation quality consistency and greatly improves the connection reliability of motor transmission components. Attached Figure Description

[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0029] Figure 1 This is a schematic diagram of the structure of this utility model;

[0030] Figure 2 This is a top view of the present invention;

[0031] Figure 3 yes Figure 2 Sectional view of AA;

[0032] Figure 4 yes Figure 3 Enlarged view of point B in the middle;

[0033] Figure 5 This is a schematic diagram of the pad block structure;

[0034] Figure 6 This is a schematic diagram of the moving block;

[0035] Figure 7 This is a schematic diagram of the installation structure of this utility model;

[0036] Figure 8 yes Figure 7 Enlarged view of point C in the middle;

[0037] In the diagram: 1. Press-fit frame; 2. Rotating shaft; 3. Pressing block; 4. Bolt; 5. Flat key; 6. Pad block; 7. Nut; 8. Moving block; 9. Spring; 10. Snap-fit ​​post; 11. Magnet; 12. Cover plate; 13. Snap ring; 14. Snap spring; 21. Keyway; 31. Snap groove; 32. Positioning rod; 41. Insertion part; 42. Shoulder; 61. Arc-shaped surface; 62. Snap plate; 63. Screw; 81. Positioning hole; 82. Groove; 83. Connecting post; 84. Positioning platform; 85. Weight reduction hole; 101. Slide groove; 121. Limiting ring; 122. Positioning plate. Detailed Implementation

[0038] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0039] like Figure 1-3 As shown, this utility model discloses a motor shaft flat key pressing device, including a pressing frame 1. The pressing frame 1 is a ring formed by three straight sides and a semi-circular arc side; the three straight sides form a U shape.

[0040] A pad 6 is snapped into the inner edge of the arc-shaped edge, and its specific structure is as follows: Figure 5As shown, the pad 6 is semi-circular, with its outer diameter matching the inner diameter of the arc-shaped edge, allowing its outer wall to fit against the inner wall of the arc-shaped edge. The inner side of the pad 6 is a semi-circular arc-shaped surface 61, with a radius matching the radius of the rotating shaft 2, ensuring it fits against the rotating shaft 2. This design maximizes the contact area between the pad 6 and the rotating shaft 2, preventing axial displacement of the rotating shaft 2. The width of the pad 6 matches the width of the pressing frame 1, and its two axial ends extend outwards to form retaining plates 62, creating a limiting groove on the outer side of the pad 6. The arc-shaped edge engages within this groove, achieving installation limitation of the pad 6. Furthermore, a screw 63 extends from the arched side of the pad 6, passing through the arc-shaped edge. The nut 7 abuts against the outer surface of the arc-shaped edge and is threadedly connected to the screw 63. This achieves the limiting connection and fixation of the pad 6 to the mounting frame. In the axial projection of the pad 6, the retaining plate 62 is located inside the arc-shaped edge, so that the pad 6 is not obstructed during installation. The mounting structure of the pad 6 makes it detachable, and by manufacturing pads 6 with different inner diameters, this invention can be applied to rotating shafts 2 of different diameters.

[0041] The pad 6 is made of a flexible material, which can be either plastic or copper. This design protects the shaft 2 from wear.

[0042] A threaded bolt 4 is provided on the straight edge opposite to the arc edge. The head of the bolt 4 is located outside the press frame 1, and the threaded end is located inside the press frame 1.

[0043] The press-fit frame 1 is equipped with a linearly movable block 8, the specific structure of which is as follows: an oblong groove 101 is formed at the center of two symmetrical, parallel straight edges adjacent to the arc-shaped edge, extending along the length of these straight edges. Both ends of the movable block 8 are provided with recessed cylindrical grooves 82, and the bottom of the grooves 82 is provided with coaxially arranged, protruding connecting posts 83. The groove opening of the groove 82 is also provided with a recessed positioning platform 84, larger in diameter than the groove 82. One end of the cover plate 12 is provided with a protruding positioning plate 122, which is engaged within the positioning platform 84 to achieve installation limitation of the cover plate 12. The cover plate 12 is provided with a limiting ring 121 protruding inwards from the groove 82. One end of the engaging post 10 is located within the groove 82 and connected to the spring 9, while the other end protrudes outwards from the cover plate 12. The outer wall of the engaging post 10 is provided with a radially protruding retaining ring 13 that engages with the limiting ring 121. Spring 9 is installed in groove 82, with one end sleeved on connecting post 83 and abutting against the bottom of groove 82; the other end sleeved on locking post 10 and abutting against retaining ring 13. This achieves the installation and limiting of spring 9. Under the elastic action of spring 9, the other end of locking post 10 protrudes outward from cover plate 12 and engages in sliding groove 101, thereby realizing the movement and guidance of moving block 8. When locking post 10 is pressed, it can move to a position where its outer side is flush with the outer side of cover plate 12.

[0044] A rectangular weight-reducing hole 85 is provided at the center of the moving block 8 along the axial direction of the arc-shaped edge. This hole is used to reduce the weight of the moving block 8, thereby reducing the driving force of the moving block 8 and lowering costs. Figure 4 As shown, the threaded end of bolt 4 is provided with a protruding insertion portion 41. The diameter of the insertion portion 41 is smaller than the diameter of the threaded portion of bolt 4, so that the root of the insertion portion 41 forms a shoulder 42. The insertion portion 41 is inserted into the movable block 8 and into the weight-reducing hole 85, and its shoulder 42 engages with the movable block 8. The portion of the insertion portion 41 located in the weight-reducing hole 85 is engaged with a retaining spring 14. In this way, bolt 4 and movable block 8 are movably connected, and under the action of shoulder 42 and retaining spring 14, bolt 4 can drive movable block 8 to move. Thus, weight-reducing hole 85 also provides installation space for retaining spring 14, facilitating the installation of retaining spring 14.

[0045] like Figure 6 As shown, the movable block 8 has a positioning hole 81 on the side near the arc edge, which communicates with the weight reduction hole 85. Four evenly distributed rectangular mounting holes are provided on the outer side of the positioning hole 81, and magnets 11 are inserted into the mounting holes. One end of the pressure block 3 has a positioning rod 32 that conforms to the shape of the positioning hole 81 and is inserted into it. The positioning hole 81 is not perfectly circular; in this embodiment, it is square. This design allows for the pressure block 3 to be positioned within the designated area. The pressure block 3 is also attracted by the magnet 11, which improves its positional stability. A slot 31 is provided on the side of the pressure block 3 facing the arc edge, used to engage the flat key 5. This ensures that when the flat key 5 engages with the keyway 21, the positional stability of the flat key 5 is higher, and it is less likely to fall off. The depth of the slot 31 is configured such that the outer area where the flat key 5 connects to the keyway 21 engages with the slot 31. The snap-fit ​​design of the pressure block 3 facilitates its assembly and disassembly. Thus, by creating pressure blocks 3 with different width slots 31, it is possible to snap-fit ​​flat keys 5 of different widths, thereby making this invention applicable to rotating shafts 2 of different diameters.

[0046] refer to Figure 7 and Figure 8 The operating steps of this utility model are as follows:

[0047] S1. Connect the flat key 5 into the slot 31;

[0048] S2. Connect the press frame 1 to the motor shaft 2;

[0049] S3, Tighten bolt 4 to bring the flat key 5 closer to the keyway 21;

[0050] S4. When the distance between the flat key 5 and the keyway 21 is less than 2mm, adjust the position of the press frame 1 so that the flat key 5 is directly opposite the keyway 21.

[0051] S5. Continue to tighten bolt 4 so that the flat key 5 is pressed into the keyway 21;

[0052] S6. Tighten the bolt 4 in the opposite direction to disengage the flat key 5 from the slot 31 and remove the press-fit frame 1.

[0053] Compared with the existing technology, the advantages of this embodiment are: 1. The progressive pressing method of driving the pressure block 3 with bolt 4 completely avoids the impact force generated by traditional knocking, prevents the bearing raceway and cage from deforming due to impact, significantly extends the service life of the bearing, and eliminates the problem of early failure caused by installation; 2. After the pressure block 3 is aligned with the keyway 21, the flat key 5 is accurately pressed in through the controllable thread feed, avoiding the skewing of the flat key 5 or damage to the keyway 21 caused by traditional knocking, resulting in good installation quality consistency and greatly improving the connection reliability of the motor transmission components.

[0054] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A motor shaft flat key press-fitting device, characterized in that, include: A press frame (1) is fitted with a motor shaft (2), with one end of its inner side abutting against the shaft (2). The pressure block (3) is set inside the pressing frame (1); Bolt (4) is threadedly connected to the press frame (1), and its threaded end drives the pressure block (3) to move, pressing the flat key (5) into the keyway (21); The press frame (1) has a flexible pad (6) that is detachably snapped into place. The pad (6) is provided with a recessed arc-shaped surface (61). The arc-shaped surface (61) is aligned with the keyway (21) of the rotating shaft (2).

2. The motor shaft flat key press-fitting device according to claim 1, characterized in that: The pad (6) has symmetrical, back-to-arc-shaped protrusions (62) on both sides. The card plates (62) form a limiting groove between each other and engage with the press frame (1).

3. The motor shaft flat key press-fitting device according to claim 2, characterized in that: The pad (6) has a screw (63) on the side facing away from the arc surface (61). The screw (63) passes through the press frame (1); The nut (7) abuts against the outer side of the press frame (1) and is threadedly connected to the screw (63).

4. The motor shaft flat key press-fitting device according to claim 1, characterized in that: The pressure block (3) is provided with a slot (31). The outer area of ​​the flat key (5) connected to the keyway (21) is engaged with the slot (31).

5. The motor shaft flat key press-fitting device according to claim 4, characterized in that: The pressing frame (1) is provided with sliding grooves (101) on both sides. The pressing frame (1) is provided with a movable block (8); The movable block (8) is movably connected to the threaded end of the bolt (4), and both ends of the movable block (8) are engaged in the slide groove (101); The pressure block (3) is engaged with the moving block (8).

6. The motor shaft flat key press-fitting device according to claim 5, characterized in that: The two ends of the movable block (8) are provided with snap-fit ​​posts (10) that are elastically connected by springs (9). The snap-fit ​​post (10) snaps into the slide groove (101).

7. The motor shaft flat key press-fitting device according to claim 5, characterized in that: The movable block (8) is provided with a non-circular positioning hole (81). The pressure block (3) is provided with a positioning rod (32) that conforms to the positioning hole (81) and engages with the positioning hole (81).

8. The motor shaft flat key press-fitting device according to claim 7, characterized in that: The movable block (8) is also fitted with a magnet (11) for adsorbing the pressure block (3).

9. The motor shaft flat key press-fitting device according to claim 6, characterized in that: The movable block (8) has recessed grooves (82) at both ends. The spring (9) is inserted into the groove (82); The two ends of the movable block (8) are fitted with cover plates (12); The cover plate (12) is provided with a limiting ring (121) that protrudes into the groove (82); One end of the snap-fit ​​post (10) is located in the groove (82) and connected to the spring (9), while the other end extends outward from the cover plate (12); The outer wall of the snap-fit ​​post (10) is provided with a snap ring (13) with radial protrusions and snap-fit ​​limiting ring (121).

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