Direct connection reciprocating drive module

Abstract

The utility model discloses a kind of direct-connection type reciprocating drive module, including driving assembly and swing frame.Improvement point is: ①driving assembly is constituted by motor and cam, and the circumferential surface of cam is provided with annular groove which is parallel and has same normal section;②swing frame is composed of swing board, spring piece arm and swing arm, spring piece arm connects support swing board and driving assembly two ends, swing arm one end rigidly connects swing board, and the other end is directly slidably matched with annular groove through swing shaft.The utility model cancels the lever hinged structure of swing arm, directly connects transmission through cam annular groove-swing shaft, reduces the number of parts, shortens transmission path, improves reliability.It is suitable for electric shaver, hair clipper, toothbrush and other small household appliances which need compact and efficient reciprocating drive.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, specifically to a direct-drive 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] Research and use have revealed that the transmission structure of the aforementioned drive module can be further simplified. Utility Model Content

[0005] To further simplify the structure of the reciprocating drive module, this utility model provides a direct-drive reciprocating drive module.

[0006] The technical solution adopted by this utility model is as follows: A direct-drive reciprocating drive module includes: a drive assembly consisting of a motor and a cam, wherein the cam is mounted on the output shaft end of the motor, and the circumferential surface of the cam is provided with annular grooves with the same and parallel normal cross sections; a swing frame consisting of a swing plate, a spring arm, and a swing arm, wherein the swing plate is arranged parallel to the axis of the cam, the spring arm is connected and supported between the two ends of the swing plate and the drive assembly, one end of the swing arm is rigidly connected to the swing plate, and the other end is slidably engaged with the annular groove through a swing shaft.

[0007] Preferably, the rocker plate, the spring arm, and the rocker arm are arranged in two sets, front and rear, symmetrically on the front and rear sides of the cam, and the two rocker plates swing in opposite directions.

[0008] Preferably, the axis of the rocker shaft intersects perpendicularly with the axis of the cam.

[0009] 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.

[0010] Preferably, the rocker plate, the spring arm, the rocker arm, and the mounting part are integrally injection molded parts.

[0011] Preferably, the motor comprises a front cover, a rear cover, an outer casing, a permanent magnet, and a rotor, and the cam is mounted on 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, and the front seat body and the rear seat body extend outward along the outer casing to form two mounting positions of the mounting part.

[0012] 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.

[0013] 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.

[0014] Preferably, the lower surface of the sway plate is inlaid with a metal fixing plate.

[0015] Preferably, the trajectory of the annular groove is an ellipse, a hyperbola, a sine curve, or a quadratic polynomial curve.

[0016] This utility model has the following beneficial effects: 1. Simplified transmission chain: The ring groove of the cam is directly linked to the rocker shaft. The elastic constraint of the rocker plate by the spring arm converts the cam rotation into linear reciprocating motion. The lever hinge structure of the rocker arm is eliminated, and the hinge seat between the rocker arm and the base is eliminated. The number of parts is reduced, the transmission path is shorter, and the reliability is improved. 2. Vibration and noise: The two sets of swing frames with a symmetrical layout make the swing plates on both sides swing in opposite directions to counteract the lateral force and suppress the vibration of the whole machine. The spring arm connects the drive component and the swing plate in one piece, and has both reset and buffer functions to reduce the noise of motion impact. Attached Figure Description

[0017] Figure 1 This is a perspective view of an embodiment of the present utility model.

[0018] Figure 2 This is a front view schematic diagram of an embodiment of the present utility model.

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

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

[0021] 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

[0022] The present invention will be further described below with reference to the embodiments and accompanying drawings.

[0023] In the embodiments, such as Figures 1-4The diagram shows a direct-drive reciprocating module, comprising: a drive assembly consisting of a motor and a cam 1, the cam 1 being mounted on the output shaft of the motor, and the circumferential surface of the cam 1 having parallel and identical normal cross-sections of annular grooves 1.1; and a rocker arm 2 consisting of a rocker plate 2.1, a spring arm 2.2, and a rocker arm 2.3. The rocker plate 2.1 is arranged parallel to the axis of the cam 1, the spring arm 2.2 is connected and supported between the rocker plate 2.1 and both ends of the drive assembly, and one end of the rocker arm 2.3 is rigidly connected to the rocker plate 2.1, while the other end is slidably engaged with the annular groove 1.1 via a rocker shaft 3. This embodiment achieves direct linkage between the cam annular groove 1.1 and the rocker shaft 3, eliminating the lever-hinged structure of the rocker arm, omitting components such as the hinge base and hinge point, reducing the number of parts, and lowering the failure rate. The spring arm 2.2 simultaneously provides elastic support and reset functions, directly converting the rotation of cam 1 into the linear reciprocating motion of rocker plate 2.1, shortening the transmission path and reducing energy loss; moreover, the spring arm 2.2 can provide stable elastic constraints, allowing the drive module to operate stably under high-frequency conditions, and is suitable for small household appliances such as electric toothbrushes, shavers, and hair clippers.

[0024] 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.

[0025] In the embodiments, such as Figure 1 , Figure 3 , Figure 4 As shown, the rocker plate 2.1, spring arm 2.2, and rocker arm 2.3 are arranged in two sets, front and rear, symmetrically on the front and rear sides of the cam 1. The two rocker plates 2.1 swing in opposite directions. The two sets of symmetrical rocker arms 2 swing in opposite directions, generating inertial forces of equal magnitude and opposite direction, which cancel out the lateral vibration source, achieve vibration vector cancellation, reduce the overall machine amplitude, and improve handheld comfort. Based on this, the synergistic output of the two rocker plates 2.1 can be used to optimize the machine head and improve the thrust or shear rate.

[0026] 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.

[0027] In the embodiments, such as Figure 4As 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.

[0028] 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.

[0029] 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.

[0030] In the embodiments, such as Figure 3 , Figure 4 As 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 trajectory of the annular groove 1.1 can be an ellipse, hyperbola, sine curve, or quadratic polynomial curve. In this embodiment, a simpler elliptical trajectory is actually used for the annular groove 1.1. To make the transmission smoother, an optimized trajectory, such as a hyperbola, sine curve, or quadratic polynomial curve, can be used to make the acceleration curve smoother, reduce transmission impact, and further extend the product life.

[0032] Obviously, the above embodiments of this utility model are merely examples for illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Other obvious variations or modifications derived from the essential spirit of the present utility model still fall within the protection scope of the present utility model.

Claims

1. A direct-drive reciprocating drive module, characterized in that: include: The drive assembly consists of a motor and a cam (1). The cam (1) is mounted on the output shaft end of the motor. The circumferential surface of the cam (1) is provided with annular grooves (1.1) with the same normal cross section and parallel. The swing frame (2) is composed of a swing plate (2.1), a spring arm (2.2) and a swing arm (2.3). The swing plate (2.1) is arranged parallel to the axis of the cam (1). The spring arm (2.2) is connected and supported between the two ends of the swing plate (2.1) and the drive assembly. One end of the swing arm (2.3) is rigidly connected to the swing plate (2.1), and the other end is slidably engaged with the annular groove (1.1) through the swing shaft (3).

2. The direct-drive reciprocating drive module according to claim 1, characterized in that, The rocker plate (2.1), the spring arm (2.2), and the rocker arm (2.3) have two sets, front and rear, which are symmetrically arranged on the front and rear sides of the cam (1), and the two rocker plates (2.1) swing in opposite directions.

3. The direct-drive reciprocating drive module according to claim 2, characterized in that, The axis of the rocker shaft (3) intersects perpendicularly with the axis of the cam (1).

4. The direct-drive reciprocating drive module according to claim 2, characterized in that, The two spring arms (2.2) at the same end are connected to the mounting part (2.4), which is mounted to the drive assembly.

5. The direct-drive reciprocating drive module according to claim 4, characterized in that, The rocker plate (2.1), the spring arm (2.2), the rocker arm (2.3), and the mounting part (2.4) are integral injection molded parts.

6. The direct-drive reciprocating drive module according to claim 4, characterized in that, The motor consists of a front cover (4), a rear cover (5), an outer shell (6), a permanent magnet (7), and a rotor (8). The cam (1) is installed 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). 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 end and the rear end of the outer shell (6). The front seat body (4.2) and the rear seat body (5.2) extend outward along the outer shell (6) to form the mounting positions of the two mounting parts (2.4).

7. The direct-drive reciprocating drive module according to claim 6, characterized in that, The bottom of the mounting part (2.4) is provided with a threaded hole (2.5), and the front seat (4.2) and the rear seat (5.2) are provided with corresponding through holes (4.3, 5.3). The threaded hole (2.5) and the through holes (4.3, 5.3) are connected and fixed by screws.

8. The direct-drive reciprocating drive module according to claim 7, characterized in that, The mounting part (2.4) is provided with slots (2.6) on the front and rear sides, and the front seat (4.2) and the rear seat (5.2) are provided with buckles (4.4, 5.4) on the front and rear sides respectively. The buckles (4.4, 5.4) are engaged in the slots (2.6) for auxiliary fixation.

9. The direct-drive reciprocating drive module according to claim 4, characterized in that, The lower surface of the swing plate (2.1) is inlaid with a metal fixing plate (2.7).

10. The direct-drive reciprocating drive module according to claim 2, characterized in that, The trajectory of the annular groove (1.1) is an ellipse, a hyperbola, a sine curve, or a quadratic polynomial curve.

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