Servo motor encoder fastening structure

Abstract

The utility model discloses a kind of servo motor encoder fastening structure, it is related to servo motor technical field, including shell, the rear end of the shell is fixedly connected with rear cover, the inside of shell is provided with motor shaft, the rear end of rear cover is provided with installation groove, the rear of installation groove is provided with connecting sleeve, the front end of connecting sleeve is provided with first connecting groove, the utility model is connected to motor shaft and encoder shaft by the first connecting groove and second connecting groove of connecting sleeve, ensure the coaxial rotation of motor shaft and encoder shaft, the friction of connecting sleeve and two shafts is enhanced by the first fixed bolt and the second fixed bolt of symmetrical distribution through jacking force, the setting of first fixed ring can limit the radial runout of connecting sleeve, the setting of second fixed ring and fixed groove can limit the radial runout of encoder main body, the possibility that vibration generated in motor operating process causes encoder main body to shift can be reduced, to improve the positioning accuracy of motor.

Description

Technical Field

[0001] This utility model relates to the field of servo motor technology, specifically to a servo motor encoder fastening structure. Background Technology

[0002] A servo motor is an engine that controls the operation of mechanical components in a servo system. It is an auxiliary motor indirect speed change device. Servo motors can control speed and have very accurate position. They can convert voltage signals into torque and speed to drive the controlled object. The rotor speed of a servo motor is controlled by the input signal and can respond quickly. In automatic control systems, it is used as an actuator and has characteristics such as small electromechanical time constant and high linearity. It can convert the received electrical signal into angular displacement or angular velocity output on the motor shaft. Servo motors are divided into two main categories: DC and AC servo motors. Their main characteristics are that there is no self-rotation when the signal voltage is zero, and the speed decreases uniformly as the torque increases. As the core feedback component of the servo motor, the encoder's connection accuracy and fixing reliability with the motor shaft directly determine the control accuracy of the motor.

[0003] Traditional encoders are often fastened by direct welding or by using a single coupling. Welding can easily cause shaft deformation, affecting the accuracy of the servo motor. On the other hand, when the servo motor is connected by a coupling, shaft misalignment can easily occur during high-frequency start-stop or high-load operation, which can lead to encoder feedback errors and a decrease in motor positioning accuracy. Therefore, a servo motor encoder fastening structure is proposed to solve the problems mentioned above. Utility Model Content

[0004] To address the aforementioned technical problems, a servo motor encoder fastening structure is provided. This technical solution solves the problem mentioned in the background art that traditional encoder fastening methods often involve direct welding or using a single coupling for connection. Welding can easily lead to shaft deformation, affecting the accuracy of the servo motor. On the other hand, when using a coupling for connection, shaft misalignment can easily occur during high-frequency start-stop or high-load operation of the servo motor, which in turn causes encoder feedback errors and reduces the positioning accuracy of the motor.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A servo motor encoder fastening structure includes a housing, a rear cover fixedly connected to the rear end of the housing, a motor shaft disposed inside the housing, a mounting groove formed at the rear end of the rear cover, a connecting sleeve disposed behind the mounting groove, a first connecting groove formed at the front end of the connecting sleeve, and a second connecting groove formed at the rear end of the connecting sleeve. The rear end of the motor shaft passes through the rear end of the mounting groove and is inserted into the first connecting groove. An encoder body is disposed at the rear end of the connecting sleeve, and an encoder shaft is disposed at the front end of the encoder body, the encoder shaft being inserted into the second connecting groove. Two symmetrically distributed first fixing holes are respectively formed on the outer surface of the connecting sleeve at corresponding positions of the first and second connecting grooves. The first and second fixing holes are threadedly connected to the inner surfaces of the first and second fixing holes, respectively. A bearing is fitted on the outer surface of the connecting sleeve between the first and second fixing bolts. A first fixing ring is fixedly connected to the outer outer ring of the bearing. Four evenly distributed first fixing brackets are fixedly connected to the outer surface of the first fixing ring. A second fixing ring is fixedly connected to the outer surface of the encoder body near the connecting sleeve. Two symmetrically distributed second fixing brackets are fixedly connected to the outer side of the second fixing ring. An encoder protective cover is provided at the rear end of the rear cover. A fixing groove is opened on the inner wall of the rear side of the encoder protective cover. The encoder body is inserted into the inside of the fixing groove.

[0006] Preferably, one end of the first fixing bolt and the second fixing bolt abuts against the outer surface of the motor shaft and the encoder shaft, respectively.

[0007] Preferably, the front inner wall of the mounting groove has four evenly distributed second mounting holes and two symmetrically distributed fourth mounting holes.

[0008] Preferably, the first fixing bracket has a first mounting hole through one end near the mounting groove, and the second fixing bracket has a third mounting hole through one end near the mounting groove. The first and second mounting holes are internally threaded with a first connecting bolt, and the third and fourth mounting holes are internally threaded with a second connecting bolt.

[0009] Preferably, the rear end of the rear cover is provided with a plurality of sixth mounting holes on the outside of the mounting groove, and the front end of the encoder protective cover is provided with a fifth mounting hole at the corresponding position of the sixth mounting holes. The fifth mounting hole and the sixth mounting hole are internally threaded with third connecting bolts.

[0010] The advantages of this utility model compared with the prior art are: This solution proposes a servo motor encoder fastening structure. The motor shaft and encoder shaft are connected by the first and second connecting slots of the connecting sleeve, ensuring coaxial rotation of the motor shaft and encoder shaft. The symmetrically distributed first and second fixing bolts enhance the friction between the connecting sleeve and the two shafts through tightening force. The first fixing ring can limit the radial runout of the connecting sleeve, and the second fixing ring and fixing slot can limit the radial runout of the encoder body. This reduces the possibility of encoder body displacement caused by vibration generated during motor operation, thereby improving the positioning accuracy of the motor. Attached Figure Description

[0011] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is an exploded view of the present invention; Figure 3 This is a schematic diagram of the connection of the first fixing bolt in this utility model; Figure 4 This is a schematic diagram of the connection of the second fixing bolt in this utility model; Figure 5 This is a schematic diagram of the connecting sleeve in this utility model.

[0012] The numbers on the map are: 1. Housing; 2. Rear cover; 3. Motor shaft; 4. Mounting slot; 5. Connecting sleeve; 6. First connecting slot; 7. Second connecting slot; 8. Encoder body; 9. Encoder shaft; 10. First fixing hole; 11. Second fixing hole; 12. First fixing bolt; 13. Second fixing bolt; 14. Bearing; 15. First fixing ring; 16. First fixing bracket; 17. First mounting hole; 18. Second mounting hole; 19. First connecting bolt; 20. Second fixing ring; 21. Second fixing bracket; 22. Third mounting hole; 23. Fourth mounting hole; 24. Second connecting bolt; 25. Encoder protective cover; 26. Fixing slot; 27. Fifth mounting hole; 28. Sixth mounting hole; 29. ​​Third connecting bolt. Detailed Implementation

[0013] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0014] Reference Figures 1-5As shown, a servo motor encoder fastening structure includes a housing 1, a rear cover 2 fixedly connected to the rear end of the housing 1, a motor shaft 3 disposed inside the housing 1, a mounting groove 4 opened at the rear end of the rear cover 2, a connecting sleeve 5 disposed behind the mounting groove 4, a first connecting groove 6 opened at the front end of the connecting sleeve 5, and a second connecting groove 7 opened at the rear end of the connecting sleeve 5. The rear end of the motor shaft 3 passes through the rear end of the mounting groove 4 and is inserted into the interior of the first connecting groove 6. An encoder body 8 is disposed at the rear end of the connecting sleeve 5, and an encoder shaft 9 is disposed at the front end of the encoder body 8. The encoder shaft 9 is inserted into the interior of the second connecting groove 7. Two symmetrically distributed first fixing holes 10 and second fixing holes 11 are respectively opened on the outer surface of the connecting sleeve 5 at corresponding positions of the first connecting groove 6 and the second connecting groove 7. The first fixing hole 10 and the second fixing hole 11 are respectively threaded with a first fixing bolt 12 and a second fixing bolt 13. The outer surface of the connecting sleeve 5 is fitted with a bearing 14 between the first fixing bolt 12 and the second fixing bolt 13. The outer ring of the bearing 14 is fixedly connected to a first fixing ring 15. The outer surface of the first fixing ring 15 is fixedly connected with four evenly distributed first fixing brackets 16. The outer surface of the encoder body 8 is fixedly connected to a second fixing ring 20 on the side near the connecting sleeve 5. The outer side of the second fixing ring 20 is fixedly connected with two symmetrically distributed second fixing brackets 21. The rear end of the rear cover 2 is provided with an encoder protective cover 25. The inner wall of the rear side of the encoder protective cover 25 is provided with a fixing groove 26. The encoder body 8 is inserted into the inside of the fixing groove 26.

[0015] Furthermore, the shapes and dimensions of the second connecting groove 7 and the first connecting groove 6 are matched with the shapes and dimensions of the encoder shaft 9 and the motor shaft 3, respectively, and the second connecting groove 7 and the first connecting groove 6 are coaxially arranged. The connecting sleeve 5 serves as an intermediate connecting part between the motor shaft 3 and the encoder shaft 9. The coaxial docking of the two shafts is achieved through the first connecting groove 6 and the second connecting groove 7 at both ends, ensuring the coaxiality of the two shafts. The encoder body 8 receives the motion information of the motor shaft 3 through the encoder shaft 9 and converts the mechanical motion into an electrical signal output.

[0016] Furthermore, the second connecting groove 7 and the encoder shaft 9, the first connecting groove 6 and the motor shaft 3, and the connecting sleeve 5 and the bearing 14 are all interference fits, while the encoder body 8 and the fixing groove 26 are transition fits.

[0017] Furthermore, one end of the first fixing bolt 12 and the second fixing bolt 13 abuts against the outer surfaces of the motor shaft 3 and the encoder shaft 9, respectively. The first fixing bolt 12 and the second fixing bolt 13 fix the connecting sleeve 5 to the motor shaft 3 and the encoder shaft 9 by tightening force, thereby enhancing the connection strength between the connecting sleeve 5 and the motor shaft 3 and the encoder shaft 9 and preventing the connection from loosening.

[0018] Furthermore, the bearing 14 is used to limit the radial runout of the connecting sleeve 5, ensuring that the connecting sleeve 5 operates smoothly and avoiding coaxiality deviation caused by vibration. The first fixing ring 15 is used to connect the bearing 14 and the first fixing frame 16, transmitting the radial force of the connecting sleeve 5 to the first fixing frame 16, preventing the bearing 14 from being damaged due to excessive local stress. The second fixing ring 20 is used to connect the encoder body 8 and the second fixing frame 21, ensuring that the encoder body 8 is subjected to uniform force through the ring structure. The second fixing frame 21 serves as the connection medium between the encoder body 8 and the rear cover 2, and is used to initially fix the encoder body 8 to prevent encoder offset.

[0019] Furthermore, the front inner wall of the mounting groove 4 is provided with four evenly distributed second mounting holes 18 and two symmetrically distributed fourth mounting holes 23. The first fixing bracket 16 is provided with a first mounting hole 17 through one end near the mounting groove 4, and the second fixing bracket 21 is provided with a third mounting hole 22 through one end near the mounting groove 4. The first mounting hole 17 and the second mounting hole 18 are internally threaded with first connecting bolts 19, and the third mounting hole 22 and the fourth mounting hole 23 are internally threaded with second connecting bolts 24.

[0020] Furthermore, the first connecting bolt 19 is threaded into the interior of the first mounting hole 17 and the second mounting hole 18 to fix the first fixing bracket 16 onto the rear cover 2, and the second connecting bolt 24 is threaded into the interior of the third mounting hole 22 and the fourth mounting hole 23 to fix the second fixing bracket 21 onto the rear cover 2.

[0021] Furthermore, the rear end of the rear cover 2 is provided with a plurality of sixth mounting holes 28 on the outside of the mounting groove 4, and the front end of the encoder protective cover 25 is provided with a fifth mounting hole 27 at the corresponding position of the sixth mounting hole 28. The fifth mounting hole 27 and the sixth mounting hole 28 are internally threaded with third connecting bolts 29.

[0022] Furthermore, the encoder protective cover 25 is used to isolate the encoder body 8 from the external environment, prevent dust and oil from entering, protect the optical components and circuits inside the encoder, and extend their service life. The fixing groove 26 is used to accommodate the rear end of the encoder body 8 and restrict the radial movement of the encoder body 8. The third connecting bolt 29 is threaded into the interior of the fifth mounting hole 27 and the sixth mounting hole 28 and is used to fix the encoder protective cover 25 to the rear cover 2.

[0023] Working principle: During installation, the rear end of the motor shaft 3 is inserted into the first connecting groove 6 of the connecting sleeve 5, and then the first fixing bolt 12 is tightened to make it abut against the outer surface of the motor shaft 3. Through the tightening force of the first fixing bolt 12 and the interference fit between the first connecting groove 6 and the motor shaft 3, a stable connection between the connecting sleeve 5 and the motor shaft 3 is achieved. Then, the bearing 14 is sleeved on the outer surface of the connecting sleeve 5, and the first connecting bolt 19 is screwed into the first mounting hole 17 and the second mounting hole 18 to fix the first fixing bracket 16. Then, the encoder shaft 9 of the encoder body 8 is inserted into the second connecting groove 7 of the connecting sleeve 5. Then, tighten the second fixing bolt 13 so that it abuts against the outer surface of the encoder shaft 9. Through the tightening force of the second fixing bolt 13 and the interference fit between the second connecting groove 7 and the encoder shaft 9, a stable connection between the connecting sleeve 5 and the encoder shaft 9 is achieved. Then, screw the second connecting bolt 24 into the third mounting hole 22 and the fourth mounting hole 23 to fix the second fixing bracket 21. Then, cover the rear end of the rear cover 2 with the encoder protective cover 25 so that the rear end of the encoder body 8 is inserted into the fixing groove 26. Finally, screw the third connecting bolt 29 into the fifth mounting hole 27 and the sixth mounting hole 28 to complete the installation.

[0024] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A servo motor encoder fastening structure, characterized in that, The device includes a housing (1), a rear cover (2) fixedly connected to the rear end of the housing (1), a motor shaft (3) disposed inside the housing (1), a mounting groove (4) opened at the rear end of the rear cover (2), a connecting sleeve (5) disposed behind the mounting groove (4), a first connecting groove (6) opened at the front end of the connecting sleeve (5), a second connecting groove (7) opened at the rear end of the connecting sleeve (5), the rear end of the motor shaft (3) passes through the rear end of the mounting groove (4) and is inserted into the interior of the first connecting groove (6), an encoder body (8) is disposed at the rear end of the connecting sleeve (5), an encoder shaft (9) is disposed at the front end of the encoder body (8), the encoder shaft (9) is inserted into the interior of the second connecting groove (7), and two symmetrically distributed first fixing holes (10) and second fixing holes (11) are respectively opened on the outer surface of the connecting sleeve (5) at the corresponding positions of the first connecting groove (6) and the second connecting groove (7). The first fixing bolt (12) and the second fixing bolt (13) are threaded into the interior of the fixed hole (10) and the second fixing hole (11), respectively. The outer surface of the connecting sleeve (5) is fitted with a bearing (14) between the first fixing bolt (12) and the second fixing bolt (13). The outer ring of the bearing (14) is fixedly connected to the outer side of the outer ring. The outer surface of the first fixing ring (15) is fixedly connected to four evenly distributed first fixing brackets (16). The outer surface of the encoder body (8) is fixedly connected to the side of the connecting sleeve (5) with a second fixing ring (20). The outer side of the second fixing ring (20) is fixedly connected to two symmetrically distributed second fixing brackets (21). The rear end of the rear cover (2) is provided with an encoder protective cover (25). The inner wall of the rear side of the encoder protective cover (25) is provided with a fixing groove (26). The encoder body (8) is inserted into the inside of the fixing groove (26).

2. The servo motor encoder fastening structure according to claim 1, characterized in that: One end of the first fixing bolt (12) and the second fixing bolt (13) abuts against the outer surfaces of the motor shaft (3) and the encoder shaft (9), respectively.

3. The servo motor encoder fastening structure according to claim 1, characterized in that: The front inner wall of the mounting groove (4) is provided with four evenly distributed second mounting holes (18) and two symmetrically distributed fourth mounting holes (23).

4. The servo motor encoder fastening structure according to claim 1, characterized in that: The first fixing bracket (16) has a first mounting hole (17) through one end near the mounting groove (4), and the second fixing bracket (21) has a third mounting hole (22) through one end near the mounting groove (4). The first mounting hole (17) and the second mounting hole (18) are connected by a first connecting bolt (19) with internal threads, and the third mounting hole (22) and the fourth mounting hole (23) are connected by a second connecting bolt (24) with internal threads.

5. The servo motor encoder fastening structure according to claim 1, characterized in that: The rear end of the rear cover (2) is located outside the mounting groove (4) and has a plurality of sixth mounting holes (28). The front end of the encoder protective cover (25) is provided with a fifth mounting hole (27) at the corresponding position of the sixth mounting hole (28). The fifth mounting hole (27) and the sixth mounting hole (28) are internally threaded with a third connecting bolt (29).

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