Reciprocating shaver drive module

Abstract

The present invention discloses a drive module for a reciprocating shaver, comprising: a base; a deflection frame, the two ends of which are fixed to the base by springs to form a frame structure; an output shaft mounted above the deflection frame; a horizontal motor disposed on the base; a cam disposed on the motor power shaft, the surface of which is provided with grooves with parallel normal sections and equal widths; a rocker arm whose lower end is hinged to the base, a middle rocker arm shaft assembled in the groove, and an upper end linked to the deflection frame. The present application converts rotary motion into high-frequency linear swinging through the precise matching of the cam and the rocker arm, with high transmission efficiency and low noise; the integrated modular structure of the base and the motor makes the matching of the cam and the rocker arm more accurate and reliable; the symmetrical reverse swinging of the dual output shafts realizes dynamic balance and vibration reduction; the compact horizontal layout saves space; the product of the present invention combines the economical efficiency of ordinary motors with the performance advantages of linear motors, which is beneficial to improving the comfort and reliability of shaver products while reducing costs.

Description

Technical Field

[0001] The present invention relates to the field of small personal care appliances and motor technology, and in particular to a drive module of a reciprocating shaver. Background Art

[0002] Reciprocating shavers are often driven by electric motors or linear motors. The motor, the most commonly used power element, converts the circular motion of the output shaft into reciprocating oscillation through transmission mechanisms such as cams and eccentric connecting rods. A linear motor consists of a stator, a mover, and a spring between them. The stator is made up of an iron core and a coil, while the mover is made up of an oscillating frame and a permanent magnet. When the coil is energized, the oscillating frame swings left and right due to the magnetic force. Patent document 202322518820.7 is a typical linear motor.

[0003] The advantages of electric motors lie in their maturity, stable performance, and low cost. However, their transmission mechanisms involve numerous components, resulting in significant vibration and noise. Their frequency is significantly limited by the transmission mechanism, making them primarily used in general products. Linear motors, on the other hand, easily achieve high-frequency vibrations and produce low noise, but they are more expensive and have relatively low reliability, making them more commonly used in high-end products.

[0004] In view of this, there is an urgent need for a new drive mechanism that can combine the advantages of an electric motor and a linear motor to meet the comprehensive requirements of reciprocating shavers for economy and performance. Summary of the Invention

[0005] In order to combine the advantages of existing drive modules, the present invention provides a drive module for a reciprocating shaver.

[0006] The technical solution adopted by the present invention is as follows: a drive module of a reciprocating shaver, comprising: a base; a sway frame, both ends of which are fixed to the base by spring clips to form a frame structure; an output shaft, installed above the sway frame; a motor, horizontally installed on the base and located within the range of the frame structure; a cam, installed on the power shaft of the motor, the surface of the cam being provided with grooves with parallel normal sections and equal widths along the circumferential direction; a rocker arm, the lower end of which is hinged to the base, the middle part of which is provided with a rocker shaft assembled in the groove, and the upper end of which is linked to the sway frame.

[0007] Preferably, the base includes an intermediate frame and a first end cover and a second end cover at both ends. The interior of the intermediate frame forms an installation space for the motor. The lower end of the rocker arm is hinged to the first end cover, and the spring is respectively installed and fixed to the first end cover and the second end cover.

[0008] Preferably, the base and the motor are an integrated structure, the intermediate frame is used to fix the stator housing of the motor or directly serves as the stator housing of the motor, the first end cover and the second end cover respectively form the front end cover and the rear end cover of the motor, and the rotor of the motor is assembled in the first end cover and the second end cover through bearings.

[0009] Preferably, the first end cover and the second end cover are plug-assembled at both ends of the intermediate frame.

[0010] Preferably, the deflection frame and the spring are an integrally structured plastic part or a metal-plastic composite part.

[0011] Preferably, the upper surface of the deflection frame is provided with a mounting groove, and the bottom support plate of the output shaft is assembled in the mounting groove and fixed by screws.

[0012] Preferably, an inlay groove is provided on a side of the deflection frame facing the base, and an inlay head is provided on the upper end of the rocker arm, and the inlay head is assembled in the inlay groove.

[0013] Preferably, the deflection frame, the spring piece, the output shaft and the rocker arm are divided into two groups and are symmetrically arranged on the front and rear sides of the cam, and the swing directions of the two output shafts are opposite.

[0014] Preferably, the distance from the lower end of the rocker arm to the rocker arm shaft is smaller than the distance from the upper end of the rocker arm to the rocker arm shaft.

[0015] Preferably, the contour line of the groove is a hyperbola, a sine curve or a quadratic polynomial curve.

[0016] The present invention has the following beneficial effects:

[0017] 1. Efficient power conversion and noise reduction: Through the precise coordination of the cam groove and the rocker arm shaft, the motor's rotary motion is converted into high-frequency linear swing of the yaw frame, improving transmission efficiency, reducing operating noise, and reducing the number of transmission parts.

[0018] 2. Integrated motor: The base and motor are integrated into one structure, or the motor as a whole serves as the base. This facilitates modular manufacturing of the base and motor, facilitates assembly, and makes the cam and rocker arm cooperate more accurately and reliably, further improving transmission performance.

[0019] 3. Structural strength: The integrated structure of the plastic deflection frame and the spring has better overall strength under high-frequency oscillation, and the deflection frame and the spring will not loosen, extending the product life;

[0020] 4. Dynamic balance and vibration reduction: The symmetrical layout of the dual deflection frames and the reverse swing output shaft achieve vibration vector cancellation, reducing the amplitude of the entire device and improving hand-held comfort;

[0021] 5. Compact modular design: The overall horizontal design reduces axial space occupation and can compress the entire machine length to fit ultra-small shaver bodies;

[0022] 6. Swing stroke: The upper half of the rocker arm is longer than the lower half. When the rocker arm length is the same, the swing frame can obtain a larger swing stroke to meet the performance requirements of the shaver. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Schematic diagram of the appearance of an embodiment of the present invention (front view).

[0024] Figure 2 Schematic diagram of the internal structure of an embodiment of the present invention (front view).

[0025] Figure 3 This is an exploded schematic diagram of an embodiment of the present invention (output shaft omitted).

[0026] Figure 4 Schematic diagram of the assembly of an embodiment of the present invention (front view).

[0027] Figure 5 Schematic diagram of the working state of an embodiment of the present invention.

[0028] Base 1, intermediate frame 1.1, first end cover 1.2, second end cover 1.3, rotor 1.4, bearing 1.5;

[0029] Deflection frame 2, installation sink 2.1, inlay groove 2.2;

[0030] Shrapnel 3;

[0031] Output shaft 4;

[0032] Cam 5, groove 5.1;

[0033] Rocker arm 6, insert head 6.1;

[0034] Rocker arm shaft 7. DETAILED DESCRIPTION

[0035] The present invention will be further described below in conjunction with the embodiments and drawings.

[0036] In the embodiment, Figure 1-Figure 4The figure shows a drive module for a reciprocating shaver, comprising: a base 1; a deflection frame 2, fixed to the base at both ends by springs 3 to form a frame structure; an output shaft 4, mounted above the deflection frame 2; a motor, mounted horizontally on the base 1 and located within the frame structure; a cam 5, mounted on the power shaft of the motor, the surface of the cam 5 being provided with grooves 5.1 of equal width and parallel to the normal section in the circumferential direction; a rocker arm 6, the lower end of which is hinged to the base 1, the middle part of which is provided with a rocker shaft 7 assembled in the groove 5.1, and the upper end of which is linked to the deflection frame 2. In this embodiment, the rotational motion of the motor is converted into high-frequency linear swinging of the deflection frame 2 through the precise matching of the groove 5.1 of the cam 5 and the rocker arm 6, thereby improving transmission efficiency, reducing working noise, and reducing the number of transmission parts. The transmission efficiency reaches the level of a linear motor, and the cost is comparable to that of an ordinary motor. In addition, the electric motor adopts a horizontal design, which reduces the axial space occupied, can compress the length of the entire machine, and is suitable for ultra-small shaver bodies.

[0037] In the embodiment, Figure 1-Figure 5 As shown, the base 1 includes an intermediate frame 1.1 and first and second end caps 1.2, 1.3 at either end. The first and second end caps 1.2, 1.3 are plugged into and assembled at either end of the intermediate frame 1.1. The interior of the intermediate frame 1.1 forms the installation space for the motor. The lower end of the rocker arm 6 is hinged to the first end cap 1.2, and the spring clip 3 is mounted and fixed to the first and second end caps 1.2, 1.3, respectively. Furthermore, the intermediate frame 1.1 serves as the stator housing of the motor, securing the permanent magnets. The first and second end caps 1.2, 1.3 form the front and rear end caps of the motor, respectively. The motor's rotor 1.4 is assembled in the two end caps via bearings 1.5. This structure integrates the base 1 and the motor, or in other words, the entire motor serves as the base 1. This facilitates modular manufacturing of the base 1 and motor, facilitating assembly. It also makes the cam 5 and rocker arm 6 more precise and reliable, further improving transmission performance.

[0038] In the embodiment, Figure 1-Figure 4 As shown, the deflection frame 2 and spring 3 are integrally formed plastic components. This integrated injection-molded composite structure of the deflection frame 2 and spring 3 provides enhanced overall strength under high-frequency oscillations, preventing loosening of the deflection frame and spring, thereby improving structural stability and extending product life. Alternatively, the deflection frame 2 can be injection-molded with the spring 3 as an insert, creating a metal-plastic composite component for even better performance.

[0039] In the embodiment, Figure 3 、 Figure 4 As shown, the upper surface of the yaw frame 2 is provided with a mounting groove 2.1, and the bottom support plate of the output shaft 4 is assembled in the mounting groove 2.1 and fixed by screws. This structure ensures that the output shaft 4 and the yaw frame 2 are accurately positioned and firmly installed, avoiding misalignment or loosening of the two.

[0040] In the embodiment, Figure 2 、 Figure 4 As shown, the side of the yaw frame 2 facing the base 1 is provided with a mounting groove 2.2. The upper end of the rocker arm 6 is provided with a mounting head 6.1, which fits into the mounting groove 2.2. The mounting groove 2.2 is a U-groove structure, and the mounting head 6.1 adopts a clearance fit. In addition to rotating within a certain angular range, it can also slide within a small range to compensate for misalignment between the two, achieving stable and reliable transmission.

[0041] In the embodiment, Figure 3 、 Figure 5 As shown, the deflection frame 2, the spring piece 3, the output shaft 4 and the rocker arm 6 are divided into two groups, which are symmetrically arranged on the front and rear sides of the cam 5, and the swing directions of the two output shafts 4 are opposite. Figure 5 In the figure, the solid and dashed lines each represent a set of simultaneously operating oscillating components. The symmetrical arrangement of the two yaw frames 2 and the counter-oscillating output shafts 4 achieve vibration vector cancellation, reducing the overall vibration amplitude and improving hand-held comfort.

[0042] In the embodiment, Figure 4 As shown, the distance from the lower end of the rocker arm 6 to the rocker arm shaft 7 is L1, and the distance from the upper end to the rocker arm shaft 7 is L2, satisfying L1 < L2. This design amplifies the rotational displacement of the cam 5, making the swing stroke of the output shaft 4 larger, meeting the needs of deep shaving.

[0043] In the embodiment, Figure 3 As shown, the contour line of the groove 5.1 is a hyperbola, a sine curve, or a quadratic polynomial curve. This embodiment actually uses a relatively simple elliptical trajectory groove 5.1. To make the transmission more stable, an optimized trajectory, such as a sine curve or a quadratic polynomial curve, can be used to make the acceleration curve smoother, reduce transmission shock, and further extend the product life.

[0044] Obviously, the above embodiments of the present invention are merely examples for illustrating the present invention and are not intended to limit the implementation of the present invention. Other obvious changes or modifications derived from the essence of the present invention still fall within the scope of protection of the present invention.

Claims

1. A drive module for a reciprocating shaver, characterized in that: include: Base (1); The two ends of the deflection frame (2) are fixed to the base via spring pieces (3) to form a frame structure; An output shaft (4) is mounted above the deflection frame (2); A motor is horizontally mounted on the base (1) and is located within the frame structure; A cam (5) is mounted on the power shaft of the motor, and the surface of the cam (5) is provided with grooves (5.1) with parallel normal sections and equal widths along the circumferential direction; A rocker arm (6), the lower end of which is hinged in the base (1), the middle portion of which is provided with a rocker arm shaft (7) assembled in the groove (5.1), and the upper end of which is linked to the deflection frame (2); The contour line of the groove (5.1) is an ellipse, a hyperbola, a sine curve or a quadratic polynomial curve; The base (1) includes an intermediate frame (1.1) and a first end cover (1.2) and a second end cover (1.3) at both ends. The interior of the intermediate frame (1.1) forms an installation space for the motor. The lower end of the rocker arm (6) is hinged to the first end cover (1.2), and the spring piece (3) is respectively installed and fixed to the first end cover (1.2) and the second end cover (1.3).

2. The drive module of the reciprocating shaver according to claim 1, characterized in that: The base (1) and the motor are an integrated structure; the intermediate frame (1.1) is used to fix the stator housing of the motor or directly serve as the stator housing of the motor; the first end cover (1.2) and the second end cover (1.3) respectively form the front end cover and the rear end cover of the motor; and the rotor (1.4) of the motor is assembled in the first end cover (1.2) and the second end cover (1.3) via a bearing (1.5).

3. The drive module of the reciprocating shaver according to claim 2, characterized in that: The first end cover (1.2) and the second end cover (1.3) are plug-fitted and assembled at both ends of the intermediate frame (1.1).

4. The drive module of the reciprocating shaver according to claim 1, characterized in that: The deflection frame (2) and the spring piece (3) are plastic parts or metal-plastic composite parts with an integrated structure.

5. The drive module of the reciprocating shaver according to claim 4, characterized in that: The upper surface of the deflection frame (2) is provided with a mounting groove (2.1), and the bottom support plate of the output shaft (4) is assembled in the mounting groove (2.1) and fixed by screws.

6. The drive module of the reciprocating shaver according to claim 1, characterized in that: A mounting groove (2.2) is provided on a side of the deflection frame (2) facing the base (1), and an embedding head (6.1) is provided at the upper end of the rocker arm (6), and the embedding head (6.1) is assembled in the embedding groove (2.2).

7. The drive module of the reciprocating shaver according to claim 1, characterized in that: The deflection frame (2), the spring (3), the output shaft (4) and the rocker arm (6) are divided into two groups and are symmetrically arranged on the front and rear sides of the cam (5), and the swing directions of the two output shafts (4) are opposite.

8. The drive module of the reciprocating shaver according to claim 1, characterized in that: The distance from the lower end of the rocker arm (6) to the rocker arm shaft (7) is smaller than the distance from the upper end of the rocker arm (6) to the rocker arm shaft (7).

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