Driving module of reciprocating type shaver

Abstract

The invention discloses a driving module of a reciprocating type shaver. The driving module comprises a base, a driving assembly and a driving assembly, the two ends of the deflection frame are fixed to the base through elastic pieces to form a frame structure. The output shaft is mounted above the deflection frame; the horizontal motor is arranged on the base; the cam is arranged on a motor power shaft, and grooves with parallel normal sections and equal width are formed in the surface of the cam; the lower end of the rocker arm is hinged to the base, a middle rocker arm shaft is assembled in the groove, and the upper end is in linkage with the deflection frame. Rotary motion is converted into high-frequency linear swing through precise cooperation of the cam and the rocker arm, the transmission efficiency is high, and noise is low; the integrated modular structure of the base and the motor enables the cam and the rocker arm to be matched more accurately and reliably; the double-output shaft symmetrically and reversely swings to realize dynamic balance vibration reduction; the compact horizontal layout saves space; the product has the economical efficiency of a common motor and the performance advantages of a linear motor, the comfort and reliability of a shaver product are improved, and meanwhile the cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical fields of personal care small household appliances and motors, and particularly to a drive module for a reciprocating shaver. Background Art

[0002] Most reciprocating shavers are driven by motors or linear motors. As the most commonly used power element, a motor converts the circular motion of the output shaft into a reciprocating swing through transmission mechanisms such as cams and eccentric connecting rods. A linear motor consists of a stator, a mover, and a shrapnel between the two. The iron core and the coil form the stator, and the oscillation frame and the permanent magnet form the mover. When the coil is energized, the oscillation frame swings left and right under the action of magnetic force. Patent document 202322518820.7 is a typical linear motor.

[0003] The advantages of a motor are that the product is mature, the performance is stable, and the cost is low. However, the transmission mechanism has many components, obvious vibration, and high noise, and the frequency is significantly limited by the transmission mechanism, so it is mostly used in general products. A linear motor is easy to achieve high-frequency vibration and has low noise, but its cost is high and the reliability of the product is relatively low, so it is mostly 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 motors and linear motors to meet the comprehensive requirements of reciprocating shavers for economy and performance. Summary of the Invention

[0005] In order to integrate 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 for a reciprocating shaver, comprising: a base; a swing frame, the two ends of which are fixed to the base through shrapnel to form a frame structure; an output shaft, installed above the swing frame; a motor, horizontally installed on the base and within the range of the frame structure; a cam, installed on the power shaft of the motor, and the surface of the cam is provided with grooves with parallel and equal-width normal sections 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 arm shaft assembled in the groove, and the upper end of which is linked with the swing frame.

[0007] Preferably, the base includes an intermediate frame and first end caps and second end caps at both ends. An installation space for the motor is formed inside the intermediate frame. The lower end of the rocker arm is hinged to the first end cap, and the shrapnel are respectively installed and fixed to the first end cap and the second end cap.

[0008] Preferably, the base and the motor are of an integral structure. The intermediate frame is used to fix the stator housing of the motor or directly serve 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. 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 inserted and assembled at both ends of the intermediate frame.

[0010] Preferably, the yaw frame and the elastic piece are an integral plastic part or a metal-plastic composite part.

[0011] Preferably, the upper surface of the yaw frame is provided with an installation sink. The bottom support plate of the output shaft is assembled in the installation sink and fixed by screws.

[0012] Preferably, the surface of the yaw frame facing the base is provided with an inlay groove. The upper end of the rocker arm is provided with an inlay head, and the inlay head is assembled in the inlay groove.

[0013] Preferably, the yaw frame, the elastic 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. The swinging 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 less 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: 1. High-efficiency power conversion and noise reduction: Through the precise cooperation between the cam groove and the rocker arm shaft, the rotary motion of the motor is converted into the high-frequency linear swing of the yaw frame, improving the transmission efficiency, reducing the working noise, and having fewer transmission parts; 2. Integrated motor: The base and the motor are of an integral structure, or the motor as a whole serves as the base, which is conducive to realizing the modular manufacturing of the base and the motor, facilitating assembly, and making the cooperation between the cam and the rocker arm more accurate and reliable, further improving the transmission performance; 3. Structural strength: The integral structure of the plastic yaw frame and the elastic piece has better overall strength under high-frequency oscillation, and there will be no looseness between the yaw frame and the elastic piece, extending the product life; 4. Dynamic balance and vibration reduction: The symmetrical layout of the double yaw frames and the output shafts with reverse swinging realize the cancellation of vibration vectors, reduce the amplitude of the whole machine, and improve the holding comfort; 5. Compact modular design: The overall horizontal design reduces the axial space occupation, can compress the overall length of the machine, and is suitable for the ultra-small shaver body; 6. Yaw Stroke: The upper half of the rocker arm is longer than the lower half. With the same rocker arm length, the yaw frame can obtain a larger swing stroke, meeting the performance requirements of the shaver. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a front view of the external shape of an embodiment of the present invention.

[0018] Figure 2 It is a front view of the internal structure of an embodiment of the present invention.

[0019] Figure 3 It is an exploded view of an embodiment of the present invention (the output shaft is omitted).

[0020] Figure 4 It is an assembly view of an embodiment of the present invention (front view).

[0021] Figure 5 It is a schematic diagram of the working state of an embodiment of the present invention.

[0022] Base 1, intermediate frame 1.1, first end cover 1.2, second end cover 1.3, rotor 1.4, bearing 1.5; Yaw frame 2, mounting sink 2.1, inlay groove 2.2; Elastic sheet 3; Output shaft 4; Cam 5, groove 5.1; Rocker arm 6, insert head 6.1; Rocker arm shaft 7. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The present invention will be further described below in conjunction with the embodiments and the drawings.

[0024] In the embodiment, as Figures 1-4 shown, it is a drive module of a reciprocating shaver, including: base 1; yaw frame 2, the two ends of which are fixed to the base through elastic sheet 3 to form a frame structure; output shaft 4, installed above the yaw frame 2; a motor, horizontally installed on the base 1 and within the range of the frame structure; cam 5, installed on the power shaft of the motor, and the surface of the cam 5 is provided with grooves 5.1 with normal sections parallel and equal in width along the circumferential direction; rocker arm 6, the lower end of which is hinged to the base 1, the middle part is provided with a rocker arm shaft 7 assembled in the groove 5.1, and the upper end is linked with the yaw frame 2. In this embodiment, through the precise cooperation of the groove 5.1 of the cam 5 and the rocker arm 6, the rotational motion of the motor is converted into the high-frequency linear swing of the yaw frame 2, the transmission efficiency is improved, the working noise is reduced, and there are fewer transmission parts. The transmission efficiency reaches the level of a linear motor, and the cost is equivalent to that of a common motor. Moreover, the motor adopts a horizontal design, reducing the axial space occupation, compressing the overall length of the machine, and adapting to the ultra-small shaver body.

[0025] In the embodiment, as Figures 1-5 shown, the base 1 includes an intermediate frame 1.1 and first end caps 1.2 and second end caps 1.3 at both ends. The first end cap 1.2 and the second end cap 1.3 are inserted and assembled at both ends of the intermediate frame 1.1. An installation space for the motor is formed inside the intermediate frame 1.1. The lower end of the rocker arm 6 is hinged to the first end cap 1.2, and the elastic pieces 3 are respectively installed and fixed to the first end cap 1.2 and the second end cap 1.3. Further, the intermediate frame 1.1 serves as the stator housing of the motor to fix the permanent magnet. The first end cap 1.2 and the second end cap 1.3 respectively form the front end cap and the rear end cap of the motor. The rotor 1.4 of the motor is assembled in the end caps through bearings 1.5. The base 1 of this structure and the motor are an integral structure, or rather, the whole motor serves as the base 1, which is conducive to realizing the modular manufacturing of the base 1 and the motor and facilitating assembly; moreover, it makes the cooperation between the cam 5 and the rocker arm 6 more accurate and reliable, further improving the transmission performance.

[0026] In the embodiment, as Figures 1-4 shown, the yaw frame 2 and the elastic piece 3 are plastic parts with an integral structure. The composite structure of the yaw frame 2 and the elastic piece 3 formed by integral injection molding has better overall strength under high-frequency oscillation. The yaw frame and the elastic piece will not become loose, improving the structural stability and extending the product life. In addition, the elastic piece 3 made of metal material can also be used as an insert to inject the yaw frame 2 to form a metal-plastic composite part to obtain better performance.

[0027] In the embodiment, as Figure 3 、 Figure 4 shown, the upper surface of the yaw frame 2 is provided with an installation sink 2.1. The bottom support plate of the output shaft 4 is assembled in the installation sink 2.1 and fixed by screws. This structure can ensure the accurate positioning and firm installation of the output shaft 4 and the yaw frame 2, avoiding misalignment or loosening between the two.

[0028] In the embodiment, as Figure 2 、 Figure 4 shown, one side of the yaw frame 2 facing the base 1 is provided with an inlay groove 2.2. The upper end of the rocker arm 6 is provided with an inlay head 6.1, and the inlay head 6.1 is assembled in the inlay groove 2.2. The inlay groove 2.2 is a U-groove structure, and the inlay head 6.1 adopts a clearance fit. In addition to rotating within a certain angle range, it can also slide within a small range to compensate for the misalignment between the two and achieve stable and reliable transmission.

[0029] In the embodiment, as Figure 3 、 Figure 5 shown, the yaw frame 2, the elastic piece 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. The swinging directions of the two output shafts 4 are opposite. Figure 5Among them, the solid line and the dotted line respectively represent a group of swinging components that operate simultaneously. The two yaw frames 2 are symmetrically arranged and cooperate with the reverse swinging output shaft 4 to achieve vibration vector cancellation, reduce the amplitude of the whole machine, and improve the hand-held comfort.

[0030] In the embodiment, as Figure 4 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 magnifies the rotational displacement of the cam 5 by a certain multiple, making the swinging stroke of the output shaft 4 larger and meeting the deep shaving requirements.

[0031] In the embodiment, as Figure 3 shown, the contour line of the groove 5.1 is a hyperbola, a sine curve or a quadratic polynomial curve. In this embodiment, the groove 5.1 with a relatively simple elliptical trajectory is actually adopted. In order to make the transmission more stable, an optimized trajectory, such as a sine curve or a quadratic polynomial curve, can be adopted to make the acceleration curve smooth, reduce the transmission impact, and further extend the product life.

[0032] Obviously, the above embodiments of the present invention are only examples for explaining the present invention, and are not intended to limit the implementation manners of the present invention. Other obvious changes or variations derived from the essential spirit of the present invention still fall within the protection scope of the present invention.

Claims

1. A drive module for a reciprocating shaver, characterized in that: include: Base (1); The two ends of the sway frame (2) are fixed to the base via spring plates (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; The rocker arm (6) has a lower end hinged in the base (1), a middle portion is provided with a rocker arm shaft (7) assembled in the groove (5.1), and an upper end is linked to the deflection frame (2).

2. The drive module of the reciprocating shaver according to claim 1, characterized in that: The base (1) comprises an intermediate frame (1.1) and a first end cover (1.2) and a second end cover (1.3) at two 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 sheet (3) is respectively installed and fixed to the first end cover (1.2) and the second end cover (1.3).

3. The drive module of the reciprocating shaver according to claim 2, 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 serves 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).

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

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

6. The drive module of the reciprocating shaver according to claim 5, 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.

7. The drive module of a 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).

8. The drive module of a reciprocating shaver according to claim 1, characterized in that: The deflection frame (2), the spring sheet (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.

9. The drive module of a 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).

10. The drive module of a reciprocating shaver according to claim 1, characterized in that: The contour line of the groove (5.1) is a hyperbola, a sine curve or a quadratic polynomial curve.

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