Internal oscillation motor with stable structure

Abstract

The utility model relates to inner vibration motor technical field discloses a kind of inner vibration motors with stable structure, including motor casing, the end cap is installed in motor casing top, the rotor shaft is rotatably connected in motor casing inside, the rotor shaft outside is provided with multiple rotors distributed along circumference, the eccentric block is provided in the rotor inside, the locating pin is slidably connected in the eccentric block inside, the locating hole that is compatible with the locating pin is arranged in the eccentric block inside, the eccentric groove is formed in the surface included angle between the rotors of the present utility model, in the eccentric block inside, setting locating pin is cooperated with the compatible locating hole that is arranged in the eccentric block inside, while the eccentric block is limited in the eccentric groove formed by adjacent rotor, effectively offset the impact force generated by long-term high-frequency vibration to eccentric block, solve the problem that eccentric block is easily displaced even loosened due to vibration impact in prior art.

Description

Technical Field

[0001] This utility model relates to the field of internal vibration motor technology, and in particular to an internal vibration motor with a stable structure. Background Technology

[0002] Internal vibration motors, as core components that generate centrifugal force through the rotation of an eccentric assembly to output vibration or reciprocating power, are widely used in massage devices, small vibration equipment, consumer electronics, and industrial auxiliary devices. Their core function relies on the coordinated operation of the eccentric assembly and the rotor shaft, and operational stability directly determines the vibration output accuracy, noise level, and service life of the equipment, making it a key indicator for evaluating the performance of internal vibration motors.

[0003] However, in the existing technology, under long-term high-frequency vibration conditions, the eccentric block of the internal vibration motor is prone to displacement or even loosening due to vibration impact. This not only directly damages the power output of the internal vibration motor, but also causes internal components to jam, leading to motor failure. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides an internal vibration motor with a stable structure, which aims to improve the problem that the eccentric block in the prior art is prone to displacement or loosening due to impact under long-term high-frequency vibration.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: An internal vibration motor with a stable structure includes a motor housing, an end cover mounted on the top of the motor housing, a rotor shaft rotatably connected inside the motor housing, a plurality of rotors distributed circumferentially on the outer side of the rotor shaft, an eccentric block on the inner side of the rotor, a positioning pin slidably connected inside the eccentric block, a positioning hole adapted to the positioning pin on the inner side of the eccentric block, and an eccentric groove formed by the included angle between the surfaces of the rotors.

[0006] As a further description of the above technical solution: The end cover and the motor housing are both provided with bearing holes in the middle. The two ends of the rotor shaft are respectively rotatably disposed in the bearing holes of the end cover and the motor housing. The eccentric block is disposed in the eccentric groove between two adjacent rotors.

[0007] As a further description of the above technical solution: The rotor and the rotor shaft are circumferentially fixed by a key connection or an interference fit.

[0008] As a further description of the above technical solution: The eccentric block has a groove for the locating pin to slide, and the sliding direction of the locating pin is consistent with the radial direction of the rotor shaft.

[0009] As a further description of the above technical solution: The outer wall of the rotor is an arc-shaped structure, and the outer circumferential contour formed by the combination of multiple rotors along the circumferential direction is circular.

[0010] This utility model has the following beneficial effects: In this invention, by setting a positioning pin inside the eccentric block and cooperating with the matching positioning hole opened on the inner side of the eccentric block, the eccentric block is confined within the eccentric groove formed by the adjacent rotor, thus constructing a dual stable structure of pin hole fit and groove constraint. This structure can effectively offset the impact force generated by long-term high-frequency vibration on the eccentric block, strictly limit the radial and circumferential displacement of the eccentric block, and completely solve the problem in the prior art that the eccentric block is prone to displacement or even loosening due to vibration and impact.

[0011] In this invention, the outer wall of the rotor is designed as an arc-shaped structure, and multiple rotors are combined along the circumference to form a circular outer circumferential outline. This not only optimizes the adaptability of the motor's internal space, but also evenly distributes the eccentric load, avoiding fatigue deformation of the local structure due to concentrated stress. Attached Figure Description

[0012] Figure 1 This is a main body diagram of an internal vibration motor with a stable structure proposed in this utility model; Figure 2 This is a schematic diagram of the motor housing of an internal vibration motor with a stable structure proposed in this utility model; Figure 3 This is a schematic diagram of the rotor of an internal vibration motor with a stable structure proposed in this utility model; Figure 4 This is a schematic diagram of the eccentric block of an internal vibration motor with a stable structure proposed in this utility model.

[0013] Legend: 1. Motor housing; 2. End cover; 3. Rotor shaft; 4. Rotor; 5. Eccentric groove; 6. Eccentric block; 7. Locating pin; 8. Locating hole; 9. Bearing hole. Detailed Implementation

[0014] 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 of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] Reference Figures 1-4This utility model provides an embodiment of an internal vibration motor with a stable structure, including a motor housing 1. The motor housing 1 is an external support frame for the internal vibration motor, which not only provides installation space for the internal core components but also isolates them from external dust, moisture, and impacts, preventing abnormal wear of internal components due to external environmental influences. An end cover 2 is installed on the top of the motor housing 1, and the end cover 2 is fixed to the top of the motor housing 1 by bolts, forming a closed internal chamber. This prevents leakage of internal lubricating oil and avoids impurities from entering the motor and jamming the components. A rotor shaft 3 is rotatably connected inside the motor housing 1. One end of the rotor shaft 3 is connected to an external drive source, and the other end drives an outer rotor 4 to rotate synchronously. Multiple rotors 4 are arranged circumferentially on the outer side of the rotor shaft 3. The tight connection between the multiple rotors 4 and the rotor shaft 3 can prevent power transmission imbalance caused by the loosening of a single rotor 4, further improving structural stability. An eccentric block 6 is provided inside the rotor 4. The number or installation position of the eccentric block 6 can be adjusted according to the actual use scenario to flexibly adapt to the power requirements of different equipment and ensure that a stable centrifugal force is generated during rotation. A positioning pin 7 is slidably connected inside the eccentric block 6. The sliding connection design between the positioning pin 7 and the eccentric block 6 not only facilitates the precise docking of the positioning pin 7 and the positioning hole 8 during assembly, but also allows for the offsetting of some vibration impacts through sliding fine adjustment during motor operation. A positioning hole 8 is provided inside the eccentric block 6 to match the positioning pin 7. The matching size design of the positioning hole 8 and the positioning pin 7 ensures that the two fit tightly, which can effectively limit the circumferential displacement of the eccentric block 6 and prevent it from rotating off-center under high-frequency vibration. An eccentric groove 5 is formed by the included angle between the surfaces of the rotors 4. The eccentric groove 5 is naturally formed by the included angle between the surfaces of two adjacent rotors 4. Its spatial dimensions match the shape of the eccentric block 6, providing a space for the eccentric block 6 to be accommodated and limited.

[0016] Reference Figures 1-4Both the end cover 2 and the motor housing 1 have bearing holes 9 in their middle sections. The two ends of the rotor shaft 3 are rotatably mounted in the bearing holes 9 of the end cover 2 and the motor housing 1, respectively. The bearing holes 9 on the end cover 2 and the motor housing 1 are coaxially designed to ensure that the center lines of the two holes coincide with the axis of the rotor shaft 3, preventing uneven wear of the rotor shaft 3 due to hole misalignment, extending the service life of the bearings and the rotor shaft 3, and ensuring long-term stable operation of the motor. An eccentric block 6 is positioned in an eccentric groove 5 between two adjacent rotors 4. The eccentric groove 5 provides lateral support for the eccentric block 6 during high-frequency vibration, preventing it from shifting outwards. Combined with the axial constraint of the positioning pin 7, this further enhances the installation stability of the eccentric block 6 and prevents it from loosening. The rotor 4 and the rotor shaft 3 are connected by a key. The eccentric block 6 is fixed in the circumferential direction by means of a contact or interference fit. The eccentric block 6 is provided with a groove for the positioning pin 7 to slide. The sliding direction of the positioning pin 7 is consistent with the radial direction of the rotor shaft 3. When the eccentric block 6 has a tendency to shift radially due to high frequency vibration, the positioning pin 7 can slide along the radial direction and fit tightly with the positioning hole 8 to form a targeted radial constraint, avoid constraint failure due to directional misalignment, and further improve the anti-displacement capability of the eccentric block 6. The outer wall of the rotor 4 is an arc-shaped structure, and the outer circumferential contour formed by the combination of multiple rotors 4 in the circumferential direction is circular. The arc-shaped structure of the outer wall of the rotor 4 can reduce the gap between it and the internal space of the motor housing 1, avoid friction with the housing during rotation, and at the same time, the arc-shaped surface can disperse air resistance and reduce wind noise during rotation.

[0017] Working principle: When an external drive source acts on the rotor shaft 3, the rotor shaft 3 rotates within the bearing holes 9 of the motor housing 1 and the end cover 2. Through the circumferential fixing action of the key connection or interference fit, it drives multiple rotors 4 distributed circumferentially on the outer side to rotate synchronously. Because the eccentric block 6 and the rotor shaft 3 are installed in the same direction, the two sides of the eccentric block 6 are placed against the rotor 4, and the bottom is used to assemble the positioning pin 7. After the positioning pin 7 is inserted radially into the sliding groove of the eccentric block 6 along the rotor shaft 3, one end of its inner side mates with the rotor 4 and is tightly fitted to the plane of the rotor 4. Through the clamping structure of the eccentric block 6, the positioning pin 7 and the two sides of the rotor 4, the bidirectional clamping and fixing of the eccentric block 6 is achieved, further improving its vibration resistance. In addition to the displacement capability, the annular groove on the inner side of the top of the eccentric block 6 needs to be designed to allow for clearance. This groove is used to avoid the contact area of ​​the commutator corner, preventing the commutator corner from directly contacting the eccentric block 6 and causing a short circuit risk, thus ensuring the stable operation of the motor circuit system. Since the center of mass of the eccentric block 6 set on the inner side of the rotor 4 is offset from the rotation center of the rotor shaft 3, the eccentric block 6 will generate a continuous centrifugal force as the rotor shaft 3 rotates. This centrifugal force is transmitted to the entire motor structure through the rotor 4 and then converted into a preset vibration output. In this process, the circumferential distribution design of multiple rotors 4 can evenly disperse the centrifugal force, avoid the dynamic balance defects of a single-block eccentric structure, and ensure that the vibration output is stable and meets the equipment requirements.

[0018] Under high-frequency vibration conditions, the eccentric block 6 is confined within the eccentric groove 5 formed by the adjacent rotor 4. The lateral support of the eccentric groove 5 is tightly fitted with the outer wall of the eccentric block 6, preventing its radial displacement. At the same time, the positioning pin 7 inside the eccentric block 6 slides radially along the rotor shaft 3 and is embedded in the positioning hole 8, forming a circumferential constraint of pin-hole fit. The double limit completely prevents the eccentric block 6 from displacing or loosening due to vibration impact. The two ends of the rotor shaft 3 are double supported by bearings in the bearing holes 9. With the coaxial design of the bearing holes 9, it is ensured that there is no radial runout when the rotor shaft 3 rotates, reducing the friction between the rotor 4 and the motor housing 1. The arc-shaped structure on the outside of the rotor 4 and the combined circular outer circumference further optimize the internal space adaptability, avoid local force concentration, and ultimately achieve stable operation of the motor under long-term high-frequency vibration.

[0019] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An internal vibration motor with a stable structure, comprising a motor housing (1), characterized in that: The motor housing (1) is equipped with an end cover (2) on top. The motor housing (1) is rotatably connected to a rotor shaft (3). Multiple rotors (4) are arranged circumferentially on the outside of the rotor shaft (3). An eccentric block (6) is arranged on the inside of the rotor (4). A positioning pin (7) is slidably connected inside the eccentric block (6). A positioning hole (8) adapted to the positioning pin (7) is opened on the inside of the eccentric block (6). An eccentric groove (5) is formed by the included angle between the surfaces of the rotors (4).

2. The internal vibration motor with a stable structure according to claim 1, characterized in that: The end cap (2) and the motor housing (1) are both provided with bearing holes (9) in the middle. The two ends of the rotor shaft (3) are respectively rotatably disposed in the bearing holes (9) of the end cap (2) and the motor housing (1). The eccentric block (6) is disposed in the eccentric groove (5) between two adjacent rotors (4).

3. The internal vibration motor with a stable structure according to claim 1, characterized in that: The rotor (4) and the rotor shaft (3) are circumferentially fixed by a key connection or interference fit.

4. The internal vibration motor with a stable structure according to claim 1, characterized in that: The eccentric block (6) has a groove for the positioning pin (7) to slide, and the sliding direction of the positioning pin (7) is consistent with the radial direction of the rotor shaft (3).

5. The internal vibration motor with a stable structure according to claim 1, characterized in that: The outer wall of the rotor (4) is an arc-shaped structure, and the outer circumferential outline formed by the combination of multiple rotors (4) in the circumferential direction is circular.

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