Miniature hollow out-shaft servo motor

Abstract

The utility model discloses a micro hollow outgoing shaft servo motor, including the body, the body one end transmission connection has hollow short axle, the free end on hollow short axle is fixedly connected with a plurality of positioning column, and positioning column outer cover is equipped with hollow long axle, the outside of hollow long axle is equipped with the bolt of screw thread combined connection with positioning column one end, the other end of positioning column is equipped with the single -end taper rod of the inside joint of hollow long axle, the synchronous motion of between bolt and single -end taper rod is realized through the double -end taper rod. In the utility model, the bolt is loosened by using the tool and makes it exit hollow long axle, and the pressure of taper surface to double -end taper rod disappears, then, the thimble is inserted from the thimble hole, and the axial force is directly applied to the top of single -end taper rod, and single -end taper rod is pushed out the card slot, realizes quick separation, and when locking is removed, hollow long axle can be easily pulled out from positioning column, and the utility model is only needed to change new hollow long axle, and the motor body does not need to be disassembled, and the maintenance process is greatly simplified.

Description

Technical Field

[0001] This utility model relates to the field of servo motor technology, and in particular to a miniature hollow output shaft servo motor. Background Technology

[0002] Existing servo motor structures are mainly divided into two categories: integral type and stator-rotor separate type. Torque transmission is usually achieved through key connections, tapered fits, or the addition of expansion sleeves. The core technical feature of hollow servo motors is that their output shaft adopts a hollow metal tube structure to meet special application requirements such as wiring, weight reduction, or integrated transmission.

[0003] However, most common hollow servo motors currently use a one-piece molded output shaft design. When the load-bearing end of the output shaft wears or is damaged due to long-term use, it is often necessary to disassemble the entire output shaft or even the entire motor to complete the replacement. The replacement process is cumbersome, time-consuming, and labor-intensive, affecting equipment maintenance efficiency and resulting in high maintenance costs. Utility Model Content

[0004] The purpose of this utility model is to provide a miniature hollow output shaft servo motor in order to solve the technical problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A miniature hollow output shaft servo motor includes a body, with a hollow short shaft connected to one end of the body for transmission. Several positioning pins are fixedly connected to the free end of the hollow short shaft. A hollow long shaft is sleeved on the positioning pins. A bolt is provided on the outside of the hollow long shaft and threadedly connected to one end of the positioning pin. A single-headed tapered rod is provided on the other end of the positioning pin and snapped into the inside of the hollow long shaft. The bolt and the single-headed tapered rod achieve synchronous movement through a double-headed tapered rod.

[0006] As a further description of the above technical solution: The bottom end of the bolt is a conical surface, and the two ends of the double-headed conical rod are tangent to the conical surface and the single-headed conical rod, respectively.

[0007] As a further description of the above technical solution: The free end of the positioning post is provided with a groove to accommodate the double-headed cone rod. A limiting groove is provided on the surface of the groove along the axial direction of the positioning post. A limiting block that slides with the limiting groove is fixedly connected to the end of the double-headed cone rod near the single-headed cone rod.

[0008] As a further description of the above technical solution: The positioning post has through holes at both ends of the double-ended tapered rod for receiving bolts and for the single-ended tapered rod to pass through, and the hollow long shaft has a groove for cooperating with the single-ended tapered rod.

[0009] As a further description of the above technical solution: The four sets of positioning posts are arranged in a circular array around the central axis of the hollow short axis, and positioning holes for accommodating the positioning posts are opened on the hollow long axis.

[0010] As a further description of the above technical solution: The hollow long shaft has a pin hole that communicates with the slot, and a relief groove to accommodate the bolt.

[0011] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are: 1. In this utility model, the bolt is loosened using a tool to remove it from the hollow long shaft. The pressure of the cone on the double-headed cone rod disappears. Then, a pin is inserted through the pin hole and applied axial force directly to the top of the single-headed cone rod to push the single-headed cone rod out of the slot, achieving quick separation. After the locking is released, the hollow long shaft can be easily pulled out from the positioning post to complete the disassembly. This device only requires the replacement of a new hollow long shaft and does not require disassembling the motor body, which greatly simplifies the maintenance process.

[0012] 2. In this utility model, a tool is used to tighten the bolt so that it enters the hollow long shaft. Its conical surface presses against one end of the double-headed conical rod, and the conical surface of the other end of the double-headed conical rod pushes the single-headed cone to move upward synchronously. The top of the single-headed conical rod gradually embeds into the groove in the inner wall of the hollow long shaft. The hollow short shaft and the hollow long shaft form a rigid whole through four sets of positioning columns and their locking mechanism. The motor torque can be transmitted to the hollow long shaft through the hollow short shaft to drive the external load. The entire connection structure is compact, has high concentricity, and the hollow channel is unobstructed, which can be used for threading or integrating other functions. Attached Figure Description

[0013] Figure 1 A three-dimensional structural schematic diagram of a miniature hollow output shaft servo motor according to an embodiment of the present utility model is shown; Figure 2 It shows Figure 1 Enlarged structural diagram at point A; Figure 3 A front view schematic diagram according to an embodiment of the present utility model is shown; Figure 4 It shows Figure 3 Schematic sectional view along the middle AA direction; Figure 5 It shows Figure 4 A magnified structural diagram at point B in the middle.

[0014] Legend: 1. Body; 2. Hollow short shaft; 3. Hollow long shaft; 301. Ejector pin hole; 302. Relief groove; 303. Positioning hole; 304. Slot; 4. Bolt; 5. Positioning pin; 501. Limiting groove; 502. Groove; 6. Limiting block; 7. Conical surface; 8. Single-headed conical rod; 9. Double-headed conical rod. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0016] Please see Figure 1-5 This utility model provides a technical solution: a miniature hollow output shaft servo motor, including a body 1 containing core components such as a stator, rotor, and bearings, providing power; a hollow short shaft 2, which is a hollow metal tube, is connected to one end of the body 1 and is the direct output end of the motor power; four sets of positioning pins 5 are fixedly connected to the free end of the hollow short shaft 2, and the four sets of positioning pins 5 are arranged in a ring array around the central axis of the hollow short shaft 2, responsible for transmitting torque and realizing axial positioning; a hollow long shaft 3 has positioning holes 303 for accommodating the positioning pins 5, and is an independently replaceable long tubular shaft used to connect external loads; the hollow short shaft 2 is permanently fixed to the body 1, while the hollow long shaft 3 is a wear part that can be replaced separately. When the end of the long shaft is worn, the motor does not need to be disassembled, and the long shaft can be removed simply by loosening the bolts 4, making maintenance extremely convenient.

[0017] like Figure 5 As shown, the hollow long shaft 3 has a bolt 4 on its outer side that is threadedly connected to one end of the positioning post 5. The bolt 4 is screwed into the positioning post 5, and its bottom end is a conical surface 7. Rotating the bolt 4 drives the entire locking mechanism. The other end of the positioning post 5 has a single-headed conical rod 8 that engages with the inner groove 304 of the hollow long shaft 3. The positioning post 5 has through holes at both ends of the double-headed conical rod 9 to accommodate the bolt 4 and the single-headed conical rod 8. The free end of the positioning post 5 has a groove 502 to accommodate the double-headed conical rod 9. The two ends of the double-headed conical rod 9 are tangent to the conical surface 7 and the single-headed conical rod 8, respectively. The conical surface 7 of the bolt 4 forms a multi-stage wedge fit with the conical surfaces of the double-headed conical rod 9 and the single-headed conical rod 8. When the bolt 4 is tightened, the axial force is converted into a huge radial compressive force through the conical surface, causing the top of the single-headed conical rod 8 to be firmly embedded in the groove 304 of the hollow long shaft 3, forming a rigid connection and ensuring efficient torque transmission.

[0018] Specifically, such as Figure 5As shown, a limiting groove 501 is formed on the surface of the groove 502 along the axial direction of the positioning post 5. A limiting block 6 that slides with the limiting groove 501 is fixedly connected to one end of the double-headed cone rod 9 near the single-headed cone rod 8, which restricts the double-headed cone rod 9 to move only along the axial direction and prevents it from rotating with the bolt 4.

[0019] Specifically, such as Figure 2 and Figure 5 As shown, the hollow long shaft 3 has a pin hole 301 that communicates with the slot 304, which is used to insert a pin during disassembly to push open the single-headed tapered rod 8 and achieve quick separation; and a relief groove 302 to accommodate the bolt 4, which is used to avoid the head of the bolt 4 so that it can be screwed into the positioning post 5 smoothly.

[0020] Working principle: In use, firstly, align the positioning hole 303 of the hollow long shaft 3 with the four sets of positioning pins 5 at the end of the hollow short shaft 2, and push them in axially. At this time, the positioning pins 5 enter the positioning hole 303, achieving preliminary circumferential and axial positioning, but not yet locked. Next, use a tool to tighten the bolt 4. The bolt 4 is screwed forward, and its conical surface 7 presses against one end of the double-headed conical rod 9. Since the limiting block 6 is restricted within the limiting groove 501, it can only move axially. Under pressure, the double-headed conical rod 9 moves forward axially. The conical surface of the other end of the double-headed conical rod 9 pushes the single-headed conical rod 8 to move upward synchronously. The top of the single-headed cone rod 8 is gradually inserted into the groove 304 on the inner wall of the hollow long shaft 3. As the bolt 4 is continuously tightened, the radial force generated by the cone surface becomes larger and larger, forcefully locking the top of the single-headed cone rod 8 into the groove 304 until it is completely locked. At this time, the bolt 4 reaches the preset torque, and the connection is completed. The hollow short shaft 2 and the hollow long shaft 3 form a rigid whole through the four sets of positioning columns 5 and their locking mechanism. The motor torque can be transmitted to the hollow long shaft 3 through the hollow short shaft 2 to drive the external load. The entire connection structure is compact, has high concentricity, and the hollow channel is unobstructed, which can be used for wiring or integrating other functions. Secondly, using a tool, loosen the bolt 4 in the reverse direction through the relief groove 302. The bolt 4 is removed from the hollow long shaft 3, and the pressure of the conical surface 7 on the double-headed conical rod 9 disappears. Then, use a pin to insert through the pin hole 301 and directly press against the top of the single-headed conical rod 8 to apply axial force, pushing the single-headed conical rod 8 out of the slot 304 to achieve quick separation. After the locking is released, the hollow long shaft 3 can be easily pulled out from the positioning post 5 to complete the disassembly. This device only requires replacing the hollow long shaft 3 and then repeating the installation steps. There is no need to disassemble the motor body, which greatly simplifies the maintenance process.

[0021] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A miniature hollow output shaft servo motor, comprising a body (1), wherein a hollow short shaft (2) is connected to one end of the body (1) for transmission, characterized in that, Several positioning posts (5) are fixedly connected to the free end of the hollow short shaft (2). A hollow long shaft (3) is fitted around the positioning posts (5). A bolt (4) is provided on the outside of the hollow long shaft (3) and threadedly connected to one end of the positioning post (5). A single-headed tapered rod (8) is provided on the other end of the positioning post (5) and snapped into the inside of the hollow long shaft (3). The bolt (4) and the single-headed tapered rod (8) move synchronously through a double-headed tapered rod (9).

2. A miniature hollow output shaft servo motor according to claim 1, characterized in that, The bottom end of the bolt (4) is a conical surface (7), and the two ends of the double-headed conical rod (9) are tangent to the conical surface (7) and the single-headed conical rod (8), respectively.

3. A miniature hollow output shaft servo motor according to claim 2, characterized in that, The free end of the positioning post (5) is provided with a groove (502) for accommodating the double-headed cone rod (9). A limiting groove (501) is provided on the surface of the groove (502) along the axial direction of the positioning post (5). A limiting block (6) that slides with the limiting groove (501) is fixedly connected to one end of the double-headed cone rod (9) near the single-headed cone rod (8).

4. A miniature hollow output shaft servo motor according to claim 3, characterized in that, The positioning post (5) has through holes at both ends of the double-headed cone rod (9) for receiving bolts (4) and single-headed cone rod (8) to pass through, and the hollow long shaft (3) has a groove (304) that mates with the single-headed cone rod (8).

5. A miniature hollow output shaft servo motor according to claim 4, characterized in that, The four sets of positioning posts (5) are arranged in a ring array around the central axis of the hollow short axis (2), and the hollow long axis (3) is provided with positioning holes (303) to accommodate the positioning posts (5).

6. A miniature hollow output shaft servo motor according to claim 5, characterized in that, The hollow long shaft (3) is provided with a pin hole (301) that communicates with the slot (304) and a relief groove (302) that accommodates the bolt (4).

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