Shock Absorber for Reciprocating Rotary Swing Motor

Abstract

The present invention discloses a shock absorber for a reciprocating rotary swing motor, which includes a housing. An accommodation cavity is formed in the housing. An elastic frame is arranged in the accommodation cavity. The elastic frame includes a positioning frame arranged along the length direction of the housing and a connecting arm arranged along the width direction of the housing. The positioning frame and the connecting arm are arranged in a cross shape. Both ends of the positioning frame are fixedly connected to the inner wall of the accommodation cavity. A counterweight is connected to the end of the connecting arm. A swing gap for the counterweight to swing is formed between the housing and the counterweight. Its structure is simple and easy to implement, and can achieve a good shock absorption and buffering effect, improve the overall structural stability of electronic products or devices using this structure, avoid causing resonance interference or damage to other components and generating adverse effects of noise, and improve the comfort of users.

Description

Technical Field

[0001] The present invention relates to the technical field of motors and their accessories Background Art

[0002] A reciprocating rotary oscillating motor, that is, a motor with an output shaft that makes a reciprocating rotary oscillation, drives other accessories to make a reciprocating rotary oscillation. The reciprocating rotary oscillating motor is a special rotary motor with a limited rotation angle. Different from the traditional motor that rotates 360 degrees in a cycle, the shaft of this motor makes a reciprocating swing within a limited angle. The advantage of this motor is that it can directly output a reciprocating swing without using an additional transmission mechanism (such as a crank rocker mechanism). Its working principle is to apply alternating current to the stator coil to generate an alternating magnetic field, and the permanent magnet on the rotor generates a constant magnetic field that makes a reciprocating swing under the action of the coil magnetic field. The reciprocating rotary oscillating motor is currently typically applied in electric toothbrushes, and its output shaft is used to drive the toothbrush head to make a reciprocating swing, so that the bristles move up and down at a high frequency, producing a continuous and efficient cleaning effect. Since the output shaft and its accessories have a certain moment of inertia, a periodic inertial force will be generated during the reciprocating swing, and the reaction force of this force will act on the motor housing. During the high-frequency reciprocating swing of the output shaft, a reaction force of high-frequency reciprocating vibration will be generated on the motor housing, which will drive the entire electronic product or device using this motor to vibrate periodically. This vibration will cause resonance interference or damage to other components in the electronic product or device, generate noise and other adverse effects, and also bring discomfort to the user during use. Summary of the Invention

[0003] Aiming at the deficiencies of the prior art, the present invention provides a shock absorber for a reciprocating rotary oscillating motor, which has a simple structure and is easy to implement, can achieve a good shock absorption and buffering effect, improve the overall structural stability of the electronic product or device using this structure, avoid causing resonance interference or damage to other components, generating noise and other adverse effects, and improve the comfort of the user.

[0004] To achieve the above object, the present invention provides a shock absorber for a reciprocating rotary oscillating motor, including a housing for rigid connection with the motor. An accommodation cavity is formed in the housing, and an elastic frame is arranged in the accommodation cavity. The elastic frame includes a positioning frame arranged along the length direction of the housing and a connecting arm arranged along the width direction of the housing. The positioning frame and the connecting arm are arranged in a cross shape. The central axis of the positioning frame coincides with the central axis of the accommodation cavity. Both ends of the positioning frame are fixedly connected to the inner wall of the accommodation cavity. A counterweight is connected to the end of the connecting arm, and a swinging gap for the counterweight to swing is formed between the housing and the counterweight.

[0005] The beneficial effects of such a setting are as follows: By rigidly connecting the entire anti-vibration device to the motor, when connecting, its central axis needs to coincide with the axis of the motor. The connection method here can be diverse. For example, connection grooves are provided on the outer wall of the housing, and the housing is inserted into the motor housing through the connection grooves, or it is integrally clamped to the end of the motor, etc. When the motor shaft makes reciprocating rotational oscillations, its periodic reaction force is transmitted to the motor housing and also synchronously transmitted to the housing of the anti-vibration device. The housing will generate periodic micro-displacements, thereby causing the spring system composed of the elastic frame and the counterweight to generate reverse resonance. The reaction force generated by the resonance is transmitted to the motor housing through the housing. The magnitude of this force is equal to and opposite in direction to the reaction force of the output shaft, and they cancel each other out. That is, the reaction force generated by the anti-vibration device and the reaction force generated by the output shaft cancel each other out, thereby reducing the periodic vibration force received by the motor housing, achieving an effective shock absorption and vibration damping effect. At the same time, the structure is simple, facilitating production and processing, and having a good usage effect.

[0006] As a further setting of the present invention, elastic support arms are provided at the ends of the connecting arms along the length direction of the housing, and the counterweights are separately arranged and correspondingly arranged on the elastic support arms.

[0007] The beneficial effects of such a setting are as follows: By setting multiple dispersed counterweights in this way, the acting forces generated by resonance can be better dispersed and effectively cancelled, thereby further reducing the periodic vibration force received by the motor housing. At the same time, this structure is simple and easy to implement, effectively improving the usage effect of the overall structure.

[0008] As a further setting of the present invention, insertion holes for connecting with the elastic support arms are formed on the counterweights, floating grooves are formed at the positions corresponding to the insertion holes on the counterweights, and the connecting arms are inserted into the floating grooves.

[0009] The beneficial effects of such a setting are as follows: This makes the installation of the counterweights more convenient. At the same time, the contact collision with the connecting arms can be reduced through the floating grooves, avoiding the generation of contact noises. At the same time, the structure is simple, facilitating production and processing, and improving the usage effect of the overall structure.

[0010] As a further setting of the present invention, a floating gap is formed between the inner wall of the floating groove and the inner wall of the connecting arm.

[0011] The beneficial effects of such a setting are as follows: This facilitates the elastic support arms to drive the counterweights to vibrate when deforming, reducing the obstruction generated by the connecting arms, enabling the vibration to be released. At the same time, this structure is simple and easy to implement, improving the usage effect of the overall structure.

[0012] As a further setting of the present invention, deformation grooves are formed on both sides of the positioning frame near the connecting arms, and arc-shaped grooves are formed on both sides of the connecting arms near the elastic support arms.

[0013] The beneficial effects of such a setting are as follows: By setting it in this way, the overall elastic frame structure is more likely to deform and twist, thereby effectively converting the acting force, better canceling the acting force, and at the same time having a simple structure, effectively improving the use effect of the overall structure.

[0014] As a further setting of the present invention, the housing is separately provided to form two sub-housings, and a slot and a plug block are provided between the two sub-housings. The slot and the plug block are inserted and matched to form a fixed connection between the two sub-housings.

[0015] The beneficial effects of such a setting are as follows: By separately providing the housing, the connection between the two is faster, facilitating the installation of the overall structure. At the same time, the structure is simple and easy to implement, improving the use effect of the overall structure. As a preference, the two sub-housings can be rotationally symmetrically arranged along the axis, making the production and processing more convenient and improving the production and processing efficiency. Here, the symmetrical setting means that one sub-housing is provided with a plug block at one connection position and a slot at another position, and the other sub-housing is provided with a slot at the position corresponding to the plug block and a plug block at another position.

[0016] As a further setting of the present invention, the plug block is provided in a wedge shape, and the shape of the slot is adapted to the shape of the plug block.

[0017] The beneficial effects of such a setting are as follows: By setting it in this way, the connection between the two sub-housings is tighter, not easily loosening, and improving the connection stability of the overall structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of the overall structure of an embodiment of the present invention;

[0019] Figure 2 is an exploded structure schematic diagram of an embodiment of the present invention;

[0020] Figure 3 is a schematic diagram of the installation structure of the counterweight block in an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] An embodiment of the shock absorber of the present invention for a reciprocating rotary swing motor is as Figures 1 to 3As shown in the figure: It includes a housing 1 for rigid connection with a motor. An accommodation cavity is formed in the housing. An elastic frame is arranged in the accommodation cavity. The elastic frame includes a positioning frame 21 arranged along the length direction of the housing and a connecting arm 22 arranged along the width direction of the housing 1. The positioning frame 21 and the connecting arm 22 are arranged in a cross shape. The central axis of the positioning frame 21 coincides with the central axis of the accommodation cavity. Both ends of the positioning frame 21 are fixedly connected to the inner wall of the accommodation cavity. A counterweight 3 is connected to the end of the connecting arm 22. A swinging gap for the counterweight 3 to swing is formed between the housing 1 and the counterweight 3. The beneficial effect of such a setting is: By setting it in this way, the whole anti-vibration device is rigidly connected to the motor. When connecting, its central axis needs to coincide with the axis of the motor. The connection method here can be various. For example, a connection groove is arranged on the outer wall of the housing and is inserted into the motor housing through the connection groove, or it is integrally clamped at the end of the motor, etc. When the motor shaft makes a reciprocating rotational swing, its periodic reaction force is transmitted to the motor housing and also synchronously transmitted to the housing of this anti-vibration device. The housing will generate periodic micro-displacements, so that the spring system composed of the elastic frame and the counterweight generates a reverse resonance. The reaction force generated by the resonance is transmitted to the motor housing through the housing. The magnitude of this force is equal to and opposite to the reaction force of the output shaft, and they cancel each other out. That is, the reaction force generated by the anti-vibration device and the reaction force generated by the output shaft cancel each other out, thereby reducing the periodic vibration force received by the motor housing, achieving an effective shock absorption and vibration damping effect. At the same time, the structure is simple, convenient for production and processing, and has a good use effect.

[0022] As a further setting of the present invention, a plug hole for connecting with the elastic support arm 23 is formed on the counterweight 3. A floating groove 31 is formed at the position of the counterweight 3 corresponding to the plug hole. The connecting arm 22 is inserted into the floating groove 31. The beneficial effect of such a setting is: By setting it in this way, the installation of the counterweight 3 is more convenient. At the same time, the contact collision with the connecting arm 22 can be reduced through the floating groove 31, which is beneficial to the release of vibration. At the same time, the structure is simple, convenient for production and processing, and improves the use effect of the overall structure.

[0023] As a further setting of the present invention, a floating gap is formed between the inner wall of the floating groove 31 and the inner wall of the connecting arm 22. The beneficial effect of such a setting is: By setting it in this way, it is convenient for the elastic support arm 23 to drive the counterweight 3 to vibrate when deforming, reducing the obstruction generated by the connecting arm 22, so that the vibration is released. At the same time, this structure is simple, easy to implement, and improves the use effect of the overall structure.

[0024] As a further arrangement of the present invention, the housing 1 is separately provided to form two sub-housings 11. A slot 13 and a plug block 12 are provided between the two sub-housings 11. The slot 13 and the plug block 12 are in plug-in fit to form a fixed connection between the two sub-housings 11. The beneficial effect of such an arrangement is that by separately providing the housing, the connection between the two is faster, facilitating the installation of the overall structure. At the same time, the structure is simple, easy to implement, and improves the use effect of the overall structure.

[0025] As a further arrangement of the present invention, the two sub-housings 11 are symmetrically arranged. The beneficial effect of such an arrangement is that by symmetrically arranging the two sub-housings 11 in this way, the production and processing become more convenient, improving the production and processing efficiency. Here, the symmetric arrangement means that for one sub-housing 11, a plug block 12 is provided at one connection position and a slot 13 is provided at the other position, and for the other sub-housing 11, a slot 13 is provided at the position corresponding to the plug block 12 and a plug block 12 is provided at the other position.

[0026] As a further arrangement of the present invention, the plug block 12 is provided in a wedge shape, and the shape of the slot 13 is adapted to the shape of the plug block 12. The beneficial effect of such an arrangement is that in this way, the connection between the two sub-housings 11 is tighter, not easily loosened, and the stability of the connection of the overall structure is improved.

[0027] The above examples are only one of the preferred specific examples of the present invention. The common changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention are included in the protection scope of the present invention.

Claims

1. A shock absorber for a reciprocating rotary oscillating motor, characterized in that: It includes a housing for rigid connection with a motor. An accommodation cavity is formed in the housing, and an elastic frame is arranged in the accommodation cavity. The elastic frame includes a positioning frame arranged along the length direction of the housing and a connecting arm arranged along the width direction of the housing. The positioning frame and the connecting arm are arranged in a cross shape. The central axis of the positioning frame coincides with the central axis of the accommodation cavity. Both ends of the positioning frame are fixedly connected to the inner wall of the accommodation cavity. A counterweight is connected to the end of the connecting arm. A swinging gap for the counterweight to swing is formed between the housing and the counterweight. An elastic support arm is arranged at the end of the connecting arm along the length direction of the housing. The counterweight is separately arranged and correspondingly arranged on the elastic support arm. A plugging hole for connecting with the elastic support arm is formed on the counterweight. A floating groove is formed at the position of the counterweight corresponding to the plugging hole. The connecting arm is inserted into the floating groove, and a floating gap is formed between the inner wall of the floating groove and the inner wall of the connecting arm. Deformation grooves are formed at positions on both sides of the positioning frame close to the connecting arm, and arc grooves are formed at positions on both sides of the connecting arm close to the elastic support arm. The housing is separately arranged to form two sub-housings, and a slot and a plugging block are arranged between the two sub-housings. The slot and the plugging block are in plugging fit to form the fixed connection of the two sub-housings.

2. The shock absorber for a reciprocating rotary oscillating motor according to claim 1, characterized in that: The plugging block is arranged in a wedge shape, and the shape of the slot is adapted to the shape of the plugging block.

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