High-speed reciprocating driving module

Abstract

The invention discloses a high-speed reciprocating driving module. The high-speed reciprocating driving module comprises a driving assembly and two sets of swing frames. Specifically, firstly, the driving assembly is composed of a motor and a groove cam; the swing frame comprises two sets of swing plates, elastic piece arms and swing arms, the swing plates are parallel to the axis of the groove cam, the elastic piece arms are connected with and support the swing plates and the driving assembly, one ends of the swing arms are rigidly connected with the swing plates, and the other ends of the swing arms are in sliding fit with the annular grooves through swing shafts; and (3) the driving stroke number of the groove cam is N, and the transmission phase difference between the two swing shafts and the groove cam is pi / N, so that the swing directions of the two swing plates are opposite. The structure has the advantages that N strokes are designed for the groove cam, the motor rotates one circle to drive the swing plate to complete N times of reciprocating, and the output frequency is increased to N times of that of a traditional single-stroke structure; the instantaneous speed directions of the double wobble plates are opposite due to the phase difference pi / N, inertia force is counteracted in real time, vibration and noise are reduced, and the handheld comfort degree is improved. According to the invention, high-frequency, low-noise and high-reliability reciprocating driving is realized with low cost.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and more specifically to a high-speed reciprocating drive module. Background Technology

[0002] Some small household appliances require linear reciprocating motion to function. A common method is to use transmission mechanisms such as cams and eccentric connecting rods to convert the circular motion of the motor output shaft into reciprocating oscillations. This structure is advantageous because it is a mature product, has stable performance, and is inexpensive. However, its transmission mechanism has many parts, exhibits significant vibration and noise, and its frequency is significantly limited by the transmission mechanism. Another approach is to use a linear motor. The principle is that when a coil is energized, the magnetic force drives an oscillating frame with a permanent magnet to oscillate back and forth. Linear motors can achieve high-frequency vibration and low noise, but they are more expensive and their reliability is relatively lower.

[0003] The applicant previously filed a patent application (application number: 202510654626.2, application date: 2025.05.21) disclosing a drive module for a reciprocating shaver. Its main structure is as follows: ① A base serves as the overall support structure; ② A tilting frame is fixed to the base via spring plates at both ends, forming a frame-like main structure; ③ An output shaft is installed above the tilting frame, serving as the power output end; ④ The motor is horizontally mounted on the base and is entirely located within the aforementioned frame structure; ⑤ A cam is directly mounted on the motor's power shaft, and its circumferential surface has annular grooves of equal width and parallel normal sections; ⑥ A rocker arm is hinged to the base at its lower end, with the middle rocker arm shaft embedded in the cam's groove for linkage, and its upper end forming a motion transmission connection with the tilting frame. The components of this drive module work together. The motor drives the cam to rotate, which in turn drives the rocker arm shaft through the groove to make the rocker arm swing back and forth. This, in turn, pushes the yaw frame to produce a yaw motion under the constraint of the spring plate. Finally, the output shaft realizes the reciprocating cutting action required by the shaver. It has the advantages of fewer transmission parts, high dynamic efficiency and transmission reliability, low noise, small size and low cost.

[0004] During research and development and use, it was discovered that the oscillation frequency of the yaw bracket in the aforementioned drive module is directly related to the motor speed; that is, one rotation of the motor / cam results in one reciprocating motion of the yaw bracket. Given this characteristic, significantly increasing the vibration frequency of the yaw bracket would require a substantial increase in the motor speed, which would significantly increase costs. Summary of the Invention

[0005] To achieve high-frequency vibration in a reciprocating drive module at low cost, this invention provides a high-speed reciprocating drive module.

[0006] The technical solution adopted in this invention is as follows: A high-speed reciprocating drive module includes: a drive assembly consisting of a motor and a slotted cam with multiple strokes, the slotted cam being mounted on the output shaft end of the motor, and the circumferential surface of the slotted cam having multiple strokes and parallel annular grooves with the same normal cross section; a swing frame consisting of a swing plate, a spring arm, and a swing arm, the swing plate being arranged parallel to the axis of the slotted cam, the spring arm being connected and supported between the two ends of the swing plate and the drive assembly, one end of the swing arm being rigidly connected to the swing plate, and the other end being slidably engaged with the annular groove through a swing shaft; there are two sets of the swing plate, the spring arm, the swing arm, and the swing shaft; the number of drive strokes of the slotted cam is N, and the transmission phase difference between the two swing shafts and the slotted cam is π / N, so that the swing directions of the two swing plates are opposite.

[0007] Preferably, the number of strokes of the slotted cam is 2, and the included angle of the two rocker shafts is 90°; the rocker shaft corresponding to the inner rocker plate is arranged on the vertical axis plane of the slotted cam, and the rocker shaft corresponding to the outer rocker plate is arranged on the horizontal axis plane of the slotted cam.

[0008] Preferably, the number of strokes of the slotted cam is 3, the included angle of the two rocker shafts is 60°, and they are symmetrically arranged on both sides of the vertical axis plane of the slotted cam.

[0009] Preferably, the axes of the two rocker shafts intersect perpendicularly with the axis of the slot cam.

[0010] Preferably, the contour curve of the annular groove, when unfolded on the circumferential surface of the slotted cam, is a periodic function curve, including one or more of an elliptic curve, a sine curve, a modified sine curve, or a higher-order polynomial; the contour curve contains N periodic variation segments of the same shape that are connected end to end along the circumferential direction of the slotted cam, and each periodic variation segment corresponds to one drive stroke; during the rotation of the slotted cam, the instantaneous velocities of any two points on the contour curve that are separated by π / N radians always have opposite directions in the axial component of the slotted cam.

[0011] Preferably, the two spring arms at the same end are connected to the mounting part, and the mounting part is mounted and connected to the drive assembly.

[0012] Preferably, the motor consists of a front cover, a rear cover, an outer casing, a permanent magnet, and a rotor. The slotted cam is installed at the output shaft end of the rotor. The front cover is divided into a front cover body and a front seat body, and the rear cover is divided into a rear cover body and a rear seat body. The front cover body and the rear cover body are respectively inserted into the front end and the rear end of the outer casing. The front seat body and the rear seat body extend outward along the outer casing to form the mounting positions of the two mounting parts.

[0013] Preferably, the bottom of the mounting part is provided with a threaded hole, and the front seat and the rear seat are provided with corresponding through holes. The threaded hole and the through hole are connected and fixed by screws.

[0014] Preferably, the mounting part is provided with slots on the front and rear sides, and the front and rear sides of the front seat and the rear seat are provided with buckles, which are engaged in the slots for auxiliary fixation.

[0015] Preferably, the rocker plate, the spring arm, the rocker arm and the mounting part are integrally injection molded parts, and a metal fixing plate is inlaid on the lower surface of the rocker plate.

[0016] The present invention has the following beneficial effects: 1. High-frequency reciprocating: Through the phase difference design of multi-stroke slot cam and double swing frame, the motor can drive the swing plate to complete multiple reciprocating motions in one rotation. Compared with the traditional single-stroke cam, the output frequency is greatly improved at the same speed, breaking through the transmission frequency limitation, while avoiding the cost and reliability problems caused by high-speed motors. 2. Dynamic vibration self-balancing: The two sets of swing frames are arranged with a transmission phase difference of π / N, so that the swing directions of the two swing plates are always opposite. Their inertial forces cancel each other out in the drive components, significantly reducing overall vibration and noise. It is especially suitable for high-frequency scenarios such as shavers and facial cleansing devices, and improves handheld comfort. 3. Compact structure: Spring arms and rocker arms replace traditional bearings or connecting rods, the motor end cover extends into the mounting part and is injection molded and integrated with the rocker frame, simplifying the transmission chain, reducing the number of parts, reducing assembly complexity and failure rate, and providing independent space to achieve high module integration. Attached Figure Description

[0017] Figure 1 This is a three-dimensional schematic diagram of the first embodiment of the present invention.

[0018] Figure 2 This is a front view schematic diagram of the first embodiment of the present invention.

[0019] Figure 3 This is an exploded view of the first embodiment of the present invention.

[0020] Figure 4 This is a schematic diagram of the swing frame in the first embodiment of the present invention.

[0021] Figure 5 This is a cross-sectional schematic diagram of the swing frame in the first embodiment of the present invention.

[0022] Figure 6 This is a cross-sectional schematic diagram of the swing frame in the second embodiment of the present invention.

[0023] 1-Cam, 1.1-Annular groove; 2-Swing frame, 2.1-Swing plate, 2.2-Spring arm, 2.3-Swing arm, 2.4-Mounting part, 2.5-Threaded hole, 2.6-Slot, 2.7-Fixing plate; 3-Swing axis; 4-Front end cover, 4.1-Front end cover body, 4.2-Front seat body, 4.3-Through hole, 4.4-Snap fastener; 5- Rear end cover, 5.1- Rear cover body, 5.2- Rear seat body, 5.3- Through hole, 5.4- Buckle; 6-Outer shell; 7-Permanent magnet; 8-Rotor. Detailed Implementation

[0024] The present invention will be further described below with reference to the embodiments and accompanying drawings.

[0025] In the embodiments, such as Figure 1-5 As shown, a high-speed reciprocating drive module includes: a drive assembly consisting of a motor and a slotted cam 1 with multiple strokes, the slotted cam 1 being mounted on the output shaft end of the motor, and the circumferential surface of the slotted cam 1 having multiple strokes and parallel annular grooves 1.1 with the same normal cross section; and a swing frame 2 consisting of a swing plate 2.1, a spring arm 2.2, and a swing arm 2.3, the swing plate 2.1 being arranged parallel to the axis of the slotted cam 1, and the spring arm 2.2 being connected and supported between the swing plate 2.1 and both ends of the drive assembly. One end of the rocker arm 2.3 is rigidly connected to the rocker plate 2.1, and the other end is slidably engaged with the annular groove 1.1 via the rocker shaft 3. There are two sets of rocker plates 2.1, spring arms 2.2, rocker arms 2.3, and rocker shafts 3. The slotted cam 1 has two strokes, and the included angle between the two rocker shafts 3 is 90°. The rocker shaft 3 corresponding to the inner rocker plate 2.1 is arranged on the vertical axis plane of the slotted cam 1, and the rocker shaft 3 corresponding to the outer rocker plate 2.1 is arranged on the horizontal axis plane of the slotted cam 1. In this embodiment, by setting a slotted cam 1 with two driving strokes, and cooperating with two rocker shafts 3 with a phase difference of 90°, the rocker plate 2.1 can complete two reciprocating motions when the motor rotates one revolution. Compared with a single-stroke cam, the output frequency is doubled at the same speed, breaking through the traditional transmission frequency limitation. Due to the phase difference design, the two rocker plates 2.1 always swing in opposite directions, and their inertial forces cancel each other out in the drive assembly, significantly reducing overall vibration and noise, and improving handheld comfort. The spring arm 2.2 replaces the traditional bearing / connecting rod, directly connecting the rocker plate 2.1 to both ends of the drive assembly, reducing the number of parts and improving reliability. Figure 5 As shown, the inner swing shaft 3 is arranged vertically and the outer swing shaft 3 is arranged horizontally to avoid motion interference and reduce the lateral size of the module. The drive module of this embodiment is suitable for small household appliances such as electric toothbrushes, shavers, hair clippers, and facial cleansing devices.

[0026] In the embodiments, such as Figure 3 As shown, the axis of the rocker shaft 3 intersects perpendicularly with the axis of the cam 1. This perpendicular intersection ensures that the force exerted by the annular groove 1.1 on the rocker shaft 3 is always perpendicular to the plane of motion, reducing lateral friction and extending the lifespan of the mechanism. Simultaneously, it eliminates torque fluctuations caused by axis misalignment, reducing overall machine vibration and noise.

[0027] In the embodiments, such as Figure 3 As shown, the contour curve of the annular groove 1.1, when unfolded on the circumferential surface of the slotted cam 1, is a periodic function curve, including one or more of an elliptic curve, a sine curve, a modified sine curve, or a higher-order polynomial. The contour curve contains two periodic segments of identical shape connected end-to-end along the circumferential direction of the slotted cam 1, each corresponding to a drive stroke. During the rotation of the slotted cam 1, the instantaneous velocity components of any two points 90° apart on the contour curve are always the same in magnitude and opposite in direction along the axial direction of the slotted cam 1. The contour curve of the annular groove 1.1 uses a smooth function to avoid abrupt acceleration changes and reduce impact noise. The axial velocity components of points 90° apart on the contour curve are always opposite, ensuring that the two rocker plates 2.1 move in strictly opposite phases. This embodiment actually uses a simpler elliptical trajectory for the annular groove 1.1. To make the transmission smoother, an optimized trajectory, such as a modified sine curve, can be used to smooth the acceleration curve, reduce transmission impact, and further extend product life.

[0028] In the embodiments, such as Figure 1 , Figure 3 , Figure 4 As shown, the two spring arms 2.2 at the same end are connected to the mounting part 2.4, which is then connected to the drive assembly. The spring arms 2.2 at the same end are integrated into the mounting part 2.4, forming a stable support structure, improving resistance to deformation, and ensuring geometric accuracy under high-frequency motion; at the same time, it facilitates the modular and rapid assembly of the drive assembly and the swing frame 2, improving production efficiency.

[0029] In the embodiments, such as Figure 3 , 4 As shown, the rocker plate 2.1, spring arm 2.2, rocker arm 2.3, and mounting part 2.4 are integrally injection molded parts. Integral injection molding eliminates stress concentration points caused by traditional riveting / screwing, extends fatigue life, reduces the number of parts, saves assembly steps, and lowers manufacturing costs.

[0030] In the embodiments, such as Figure 3 , Figure 4As shown, a metal fixing plate 2.7 is embedded in the lower surface of the rocker plate 2.1. The metal fixing plate 2.7 can be embedded in the rocker frame 2 as an injection-molded insert to form a whole, thereby improving the strength and rigidity of the rocker plate 2.1, reducing deformation during instantaneous impact, suppressing motion trajectory deviation caused by plastic creep, and reducing displacement error of high-frequency reciprocating motion.

[0031] In the embodiments, such as Figure 3 As shown, the motor consists of a front cover 4, a rear cover 5, a housing 6, a permanent magnet 7, and a rotor 8. A cam 1 is mounted on the output shaft end of the rotor 8. The front cover 4 is divided into a front cover body 4.1 and a front seat body 4.2, and the rear cover 5 is divided into a rear cover body 5.1 and a rear seat body 5.2. The front cover body 4.1 and the rear cover body 5.1 are respectively inserted into the front and rear ends of the housing 6. The front seat body 4.2 and the rear seat body 5.2 extend outwards along the housing 6, forming two mounting parts 2.4. The front seat body 4.2 and the seat body 5.2 extend from the end cover to form the mounting parts, eliminating the need for an independent support structure. This not only compresses the axial space but also improves the overall installation stability of the drive assembly and the swing frame 2.

[0032] In the embodiments, such as Figure 3 , Figure 4 As shown, the bottom of the mounting part 2.4 is provided with a threaded hole 2.5, and the front seat 4.2 and rear seat 5.2 are respectively provided with through holes 4.3 and 5.3. The threaded hole 2.5 and the through holes 4.3 and 5.3 are connected and fixed by screws. The front and rear sides of the mounting part 2.4 are provided with slots 2.6, and the front and rear sides of the front seat 4.2 and rear seat 5.2 are respectively provided with buckles 4.4 and 5.4. The buckles 4.4 and 5.4 are engaged in the slots 2.6 for auxiliary fixing. The screw connection provides the main fixing force, and the engagement of the buckles 4.4 and 5.4 with the slots 2.6 plays an auxiliary role, helping to absorb vibration and impact and prevent the screws from loosening. At the same time, the engagement can play a positioning role during assembly, eliminating or simplifying tooling fixtures.

[0033] In another embodiment, such as Figure 6 As shown, the slotted cam 1 has a stroke of 3, and the two rocker shafts 3 are arranged symmetrically on both sides of the vertical axis plane of the slotted cam 1 at an angle of 60°. In this structure, the motor and the slotted cam 1 output 3 reciprocating cycles per revolution, increasing the frequency to 3 times that of the traditional structure, making it suitable for ultra-high frequency vibration scenarios. The two rocker shafts 3 are symmetrical with respect to the vertical axis plane, and their inertial torques are balanced, suppressing torsional vibration.

[0034] Obviously, the above embodiments of the present invention are merely illustrative examples to illustrate the invention and are not intended to limit the implementation of the invention. Other obvious variations or modifications derived from the essential spirit of the invention still fall within the protection scope of the invention.

Claims

1. A high speed shuttle drive module, characterized by: The utility model relates to a high-speed reciprocating drive module, including: a drive assembly composed of a motor and a groove cam (1) with multiple strokes, the groove cam (1) is installed at the output shaft end of the motor, the circumferential surface of the groove cam (1) is provided with multiple strokes, the normal section is same and parallel annular groove (1.1); A swing frame (2) is composed of a swing board (2.1), a spring piece arm (2.2) and a swing arm (2.3), the swing board (2.1) is arranged parallel to the axis of the groove cam (1), the spring piece arm (2.2) is connected and supported between the swing board (2.1) and the two ends of the drive assembly, one end of the swing arm (2.3) is rigidly connected with the swing board (2.1), and the other end is slidably connected with the annular groove (1.1) through a swing shaft (3); The swing board (2.1), the spring piece arm (2.2), the swing arm (2.3) and the swing shaft (3) have two groups; the drive stroke number of the groove cam (1) is N, the transmission phase difference between the two swing shafts (3) and the groove cam (1) is π / N, so that the swing directions of the two swing boards (2.1) are opposite.

2. The high speed shuttle drive module of claim 1, wherein, The stroke number of the groove cam (1) is 2, and the included angle of the two swing shafts (3) is 90 degrees; The swing shaft (3) corresponding to the inner swing board (2.1) is arranged on the axial plane of the groove cam (1) in the vertical direction, and the swing shaft (3) corresponding to the outer swing board (2.1) is arranged on the axial plane of the groove cam (1) in the horizontal direction.

3. The high speed shuttle drive module of claim 1, wherein, The stroke number of the groove cam (1) is 3, the included angle of the two swing shafts (3) is 60 degrees, and the two swing shafts (3) are symmetrically arranged on the two sides of the axial plane of the groove cam (1) in the vertical direction.

4. The high speed shuttle drive module of claim 1 or 2 or 3, wherein, The axes of the two swing shafts (3) and the axis of the groove cam (1) are perpendicular to each other.

5. The high-speed reciprocating drive module according to claim 1 or 2 or 3, wherein: The profile curve of the annular groove (1.1) on the circumferential surface of the groove cam (1) is a periodic function curve, including one or more of an elliptical curve, a sine curve, a modified sine curve or a high-order polynomial; The profile curve contains N periodic variation sections with consistent shapes and connected in a loop in the circumferential direction of the groove cam (1), and each periodic variation section corresponds to one drive stroke; During the rotation of the groove cam (1), the instantaneous velocities of any two points on the profile curve with an interval of π / N radian are always in opposite directions in the axial direction of the groove cam (1).

6. The high speed shuttle drive module of claim 1 or 2 or 3, wherein, Two spring piece arms (2.2) at the same end are connected to a mounting portion (2.4), and the mounting portion (2.4) is mounted and connected with the drive assembly.

7. The high speed shuttle drive module of claim 6, wherein, The motor is composed of a front end cover (4), a rear end cover (5), an outer shell (6), a permanent magnet (7) and a rotor (8), and the groove cam (1) is installed at the output shaft end of the rotor (8). The front end cover (4) is divided into a front cover body (4.1) and a front seat body (4.2), the rear end cover (5) is divided into a rear cover body (5.1) and a rear seat body (5.2), the front cover body (4.1) and the rear cover body (5.1) are respectively inserted at the front end and the rear end of the outer shell body (6), the front seat body (4.2) and the rear seat body (5.2) extend outward along the outer shell body (6) and respectively form mounting positions of two mounting portions (2.4).

8. The high speed shuttle drive module of claim 7, wherein, The bottom of the mounting portion (2.4) is provided with a threaded hole (2.5), the front seat body (4.2) and the rear seat body (5.2) are correspondingly provided with through holes (4.3, 5.3), and the threaded hole (2.5) and the through holes (4.3, 5.3) are fixed by screw connection.

9. The high speed shuttle drive module of claim 8, wherein, The front and rear sides of the mounting portion (2.4) are provided with clamping grooves (2.6), the front and rear sides of the front seat body (4.2) and the rear seat body (5.2) are correspondingly provided with buckles (4.4, 5.4), and the buckles (4.4, 5.4) are clamped in the clamping grooves (2.6) for auxiliary fixing.

10. The high speed shuttle drive module of claim 6, wherein, The rocking plate (2.1), the elastic sheet arm (2.2), the rocking arm (2.3) and the mounting portion (2.4) are integrally injection molded, and the lower surface of the rocking plate (2.1) is inlaid with a fixed plate (2.7) made of metal.

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