Rotary electric toothbrush

Abstract

The utility model provides a rotary type electric toothbrush which comprises a brush rod, a brush disc capable of being installed at the first end of the brush rod in a reciprocating rotation mode, an eccentric structure and a U-shaped ball head shaft, a driving shaft is arranged in the brush rod, the eccentric structure comprises an eccentric portion and an installation portion, and the first end of the eccentric portion is fixedly connected with the first end of the installation portion. The second end of the mounting part is fixedly connected with the first end of the driving shaft, the central axis of the mounting part coincides with the central axis of the driving shaft, the central axis of the eccentric part and the central axis of the driving shaft are arranged in an alpha-degree included angle, the bottom end of the U-shaped ball head shaft is rotationally connected with the second end of the eccentric part, and the top of the U-shaped ball head shaft is rotationally connected with a transmission block on the bottom side of the brush disc. The inward eccentric structure and the U-shaped ball head shaft are adopted to drive the brush disc to rotate and swing in a reciprocating mode, the centrifugal force of the eccentric structure can be effectively reduced, the brush disc is not prone to shaking, the brush disc works stably, the brush disc is not prone to being rubbed with other parts to generate noise, and the experience feeling of a user is better.

Description

Technical Field

[0001] The utility model relates to the technical field of electric toothbrushes, in particular to a rotary electric toothbrush. Background Art

[0002] Currently, most of the brush heads of rotary toothbrushes on the market are driven by eccentric shafts.

[0003] For example, the Chinese utility model patent with authorization announcement number CN2666372Y discloses an electric toothbrush head using a U-shaped rocker, which includes a brush rod and a brush plate mounted on the end of the brush rod, a transmission shaft is provided inside the brush rod, a bearing is installed between the transmission shaft and the brush rod, a clearance compensation spring is installed on the shoulder of the transmission shaft, a U-shaped rocker is movably installed on the short shafts on both sides of the rear of the brush plate, the concave ball head at the bottom of the U-shaped rocker is movably matched with the eccentric convex ball head at the front end of the transmission shaft, a mounting platform is provided on the inner side of the end of the brush rod, a clearance compensation spring is provided on the outer side of the mounting platform, and the brush plate and the mounting platform of the brush rod are installed on the same straight axis. The transmission shaft rotates, and the brush plate is driven to perform reciprocating large swing angle rotation through the U-shaped rocker connected to its eccentric convex ball head. This electric toothbrush head adopts a transmission mechanism composed of a transmission shaft with an eccentric convex ball head and a U-shaped rocker, which can drive the brush plate to perform reciprocating rotation with a large swing amplitude. At the same time, the clearance compensation spring on the shoulder of the transmission shaft can automatically adjust the clearance between the eccentric convex ball head at the front end of the transmission shaft and the concave ball head at the bottom end of the U-shaped rocker. The clearance compensation spring between the brush plate and the mounting platform at the end of the brush rod can automatically adjust the clearance between the two, ensuring the close fit between the transmission shaft and the brush plate, and between the brush plate and the brush rod, improving the transmission efficiency, and greatly extending the service life of the toothbrush head. However, the brush head of the utility model toothbrush adopts an eccentric structure transmission, which easily causes uneven force on the whole machine during operation, resulting in the phenomenon of brush head shaking. At the same time, the friction between the components will also increase, the noise is relatively large, the quality is unstable, and the consumer experience is not good.

[0004] Therefore, the prior art still needs to be improved and developed for the above-mentioned defects. Utility Model Content

[0005] The utility model aims to provide a rotary electric toothbrush to overcome the defects and shortcomings of the prior art.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0007] The utility model provides a rotary electric toothbrush, comprising a brush rod, a brush disc reciprocatingly mounted on the first end of the brush rod, an eccentric structure and a U-shaped ball head shaft, wherein a driving shaft is arranged inside the brush rod, and the eccentric structure comprises an eccentric part and a mounting part, wherein the first end of the eccentric part is fixedly connected to the first end of the mounting part, the second end of the mounting part is fixedly connected to the first end of the driving shaft, and the central axis of the mounting part coincides with the central axis of the driving shaft, and the central axis of the eccentric part and the central axis of the driving shaft are arranged at an angle of a°, the bottom end of the U-shaped ball head shaft is rotationally connected to the second end of the eccentric part, and the top of the U-shaped ball head shaft is rotationally connected to the transmission block on the bottom side of the brush disc. Through the above-mentioned structural setting, that is, adopting the inward eccentric structure and the U-shaped ball head shaft to drive the brush disc to rotate and swing back and forth, the centrifugal force of the eccentric structure can be effectively reduced, so that the brush disc is not easy to shake, the brush disc works stably, and it is not easy to rub against other parts to generate noise, and the user experience is better.

[0008] According to the above scheme, the bottom end of the U-shaped ball head shaft is provided with a connecting hole, the second end of the eccentric part is arranged in the connecting hole, and a gap is arranged between the outer peripheral wall of the second end of the eccentric part and the inner wall of the connecting hole. Through the above structural arrangement, when the eccentric part transmits the bottom end of the U-shaped ball head shaft, the U-shaped ball head shaft can realize a conical rotation motion at an angle of a°.

[0009] According to the above scheme, the eccentric part is a cylindrical structure, and the connecting hole is a cylindrical hole. Through the above structural setting, the driving shaft can drive the eccentric part to perform 360° orbital motion, and the second end of the eccentric part can also rotate in the connecting hole, so that the U-shaped ball head shaft can achieve conical rotation at an angle of a°, and the brush plate can achieve a relatively large swing.

[0010] According to the above scheme, the transmission block is fixed at the center of the bottom side of the brush plate, and two spherical grooves / spherical convex heads are symmetrically arranged on the transmission block. The two ends of the top of the U-shaped ball head shaft are symmetrically provided with spherical convex heads / spherical grooves, and the spherical convex heads / spherical grooves on the U-shaped ball head shaft are arranged correspondingly to the spherical grooves / spherical convex heads on the transmission block. Through the above structural setting, during installation, the spherical convex head is placed inside the spherical groove, and the spherical convex head can realize multiple directions of rotation in the spherical groove, so that the two ends of the top of the U-shaped ball head shaft and the transmission block on the rear side of the brush plate can be flexibly rotated and connected.

[0011] According to the above scheme, a compensation spring is also included, a limit bracket is fixed inside the brush rod, the drive shaft is rotatably inserted into the limit bracket, the compensation spring is sleeved outside the drive shaft, and one end of the compensation spring abuts against the limit bracket, and the other end of the compensation spring abuts against the mounting portion of the eccentric structure. Through the above structural setting, the compensation spring is used to automatically compensate for the gap between the bottom end of the U-shaped ball head shaft and the second end of the eccentric part, and to compensate for the gap between the spherical protrusion at the top end of the U-shaped ball head shaft and the spherical groove of the transmission block, so as to avoid excessive gaps and noise.

[0012] According to the above scheme, a mounting seat is fixedly provided at the first end of the brush rod, the brush disc is embedded in the mounting seat, a first central axis hole is provided on the transmission block, a second central axis hole is provided in the mounting seat, one end of the brush disc shaft of the brush disc is provided in the first central axis hole, and the other end of the brush disc shaft is provided in the second central axis hole, and the brush disc performs reciprocating rotational motion around the brush disc shaft. Through the above structural setting, the reciprocating rotational motion of the brush disc is more stable, and the edge of the brush disc will not rub against the mounting seat at the first end of the brush rod to generate noise.

[0013] According to the above scheme, a limit pin is also included, an annular groove is provided at one end of the transmission block away from the U-shaped ball head shaft, a positioning hole corresponding to the annular groove is provided on the mounting seat of the brush rod, the tail end of the limit pin passes through the positioning hole and is placed in the annular groove, and the tail end of the limit pin is movably matched with the annular groove. Through the above structural setting, the brush disc can be prevented from being separated from the mounting seat when working.

[0014] According to the above solution, the end of the mounting portion that abuts against the compensation spring is provided with a first limit block, the end of the limit bracket that abuts against the compensation spring is provided with a second limit block, one end of the compensation spring is sleeved on the first limit block, and the other end of the compensation spring is sleeved on the second limit block. Through the above structural setting, the position of the compensation spring can be better limited, making the compensation spring work more stably.

[0015] According to the above solution, the limiting bracket is provided with a first through hole, the driving shaft passes through the first through hole and is fixedly connected to the mounting portion of the eccentric structure, a buckle is provided on the outer side of the limiting bracket, a slot is provided inside the brush rod, the limiting bracket is installed inside the brush rod, and the buckle is placed in the slot. The above structural setting facilitates the installation and fixing of the limiting bracket inside the brush rod.

[0016] According to the above solution, the brush rod and the mounting seat are integrally formed. Through the above structural arrangement, the electric toothbrush has a better overall shape and better structural strength.

[0017] Beneficial effects of the utility model:

[0018] The utility model adopts an inward eccentric structure and a U-shaped ball head shaft to drive the brush disc to rotate and reciprocate, which can effectively reduce the centrifugal force of the eccentric structure, so that the brush disc is not easy to shake when it rotates and swings back and forth. The brush disc works stably and is not easy to rub against other parts to generate noise, which provides a better user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the exploded structure of the utility model;

[0020] Figure 2 It is a cross-sectional view of the utility model;

[0021] Figure 3 It is a partial structural schematic diagram of the utility model;

[0022] Figure 4 It is a schematic diagram of the eccentric structure of the utility model;

[0023] Figure 5 It is a cross-sectional view of the U-shaped ball head shaft of the utility model;

[0024] Figure 6 a is a first use state diagram of the utility model;

[0025] Figure 6 b is a second use state diagram of the utility model;

[0026] Figure 6 c is a third use state diagram of the utility model;

[0027] Figure 6 d is a fourth use state diagram of the utility model.

[0028] In the figure: 1. brush rod; 2. brush disc; 3. drive shaft; 4. eccentric structure; 5. U-shaped ball head shaft; 6. compensation spring; 7. limit bracket; 8. brush disc shaft; 9. limit pin; 11. mounting seat; 12. second center axis hole; 13. slot; 21. transmission block; 22. spherical groove; 23. first center axis hole; 24. annular groove; 41. eccentric part; 42. mounting part; 43. first limit block; 51. spherical boss; 71. second limit block; 72. first through hole; 73. buckle. DETAILED DESCRIPTION

[0029] The technical solution of the utility model is described below in conjunction with the accompanying drawings and embodiments.

[0030] Example 1

[0031] like Figure 1-5As shown, the utility model provides a rotary electric toothbrush, comprising a brush rod 1, a brush disc 2 reciprocatingly mounted on the first end of the brush rod 1, an eccentric structure 4 and a U-shaped ball head shaft 5, wherein a drive shaft 3 is arranged inside the brush rod 1, and the eccentric structure 4 comprises an eccentric portion 41 and a mounting portion 42, wherein the first end of the eccentric portion 41 is fixedly connected to the first end of the mounting portion 42, the second end of the mounting portion 42 is fixedly connected to the first end of the drive shaft 3, and the central axis of the mounting portion 42 coincides with the central axis of the drive shaft 3, the central axis of the eccentric portion 41 is arranged at an angle of a° to the central axis of the drive shaft 3, the bottom end of the U-shaped ball head shaft 5 is rotatably connected to the second end of the eccentric portion 41, and the top of the U-shaped ball head shaft 5 is rotatably connected to the transmission block 21 on the bottom side of the brush disc 2. Through the above-mentioned structural setting, that is, using the inward eccentric structure 4 and the U-shaped ball head shaft 5 to drive the brush plate 2 to rotate and reciprocate, the centrifugal force of the eccentric structure 4 can be effectively reduced, so that the brush plate 2 is not easy to shake, the brush plate 2 works stably, and is not easy to rub against other parts to generate noise, and the user experience is better.

[0032] Furthermore, a connecting hole is provided at the bottom end of the U-shaped ball head shaft 5, the second end of the eccentric portion 41 is provided in the connecting hole, and a gap is provided between the outer peripheral wall of the second end of the eccentric portion 41 and the inner wall of the connecting hole. Through the above-mentioned structural arrangement, when the eccentric portion 41 transmits the bottom end of the U-shaped ball head shaft 5, the U-shaped ball head shaft 5 can realize a conical rotation motion at an angle of a°.

[0033] Furthermore, the eccentric portion 41 is a cylindrical structure, and the connecting hole is a cylindrical hole. Through the above-mentioned structural arrangement, the driving shaft 3 can drive the eccentric portion 41 to perform a 360° orbital motion, the second end of the eccentric portion 41 can also rotate in the connecting hole, the U-shaped ball head shaft 5 can perform a conical rotation motion at an angle of a°, and the brush plate 2 can achieve a relatively large swing.

[0034] Further, the transmission block 21 is fixed at the center of the bottom side of the brush disc 2, and two spherical grooves 22 are symmetrically arranged on the transmission block 21. Spherical protrusions 51 are symmetrically arranged at both ends of the top of the U-shaped ball head shaft 5, and the spherical protrusions 51 on the U-shaped ball head shaft 5 are arranged corresponding to the spherical grooves 22 on the transmission block 21. Through the above-mentioned structural setting, during installation, the spherical protrusion 51 is placed inside the spherical groove 22, and the spherical protrusion 51 can realize multiple directions of rotation in the spherical groove 22, so that the two ends of the top of the U-shaped ball head shaft 5 and the transmission block 21 on the rear side of the brush disc 2 can be flexibly rotated and connected.

[0035] Furthermore, it also includes a compensation spring 6, a limit bracket 7 is fixedly provided inside the brush rod 1, the drive shaft 3 is rotatably inserted into the limit bracket 7, the compensation spring 6 is sleeved outside the drive shaft 3, and one end of the compensation spring 6 abuts against the limit bracket 7, and the other end of the compensation spring 6 abuts against the mounting portion 42 of the eccentric structure 4. Through the above-mentioned structural setting, the compensation spring 6 is used to automatically compensate for the gap between the bottom end of the U-shaped ball head shaft 5 and the second end of the eccentric part 41, and to compensate for the gap between the spherical protrusion 51 at the top of the U-shaped ball head shaft 5 and the spherical groove 22 of the transmission block 21, so as to avoid excessive gaps and noise.

[0036] Further, the first end of the brush rod 1 is fixedly provided with a mounting seat 11, the brush disc 2 is embedded in the mounting seat 11, the transmission block 21 is provided with a first central axis hole 23, the mounting seat 11 is provided with a second central axis 12 hole, one end of the brush disc shaft 8 of the brush disc 2 is arranged in the first central axis hole 23, and the other end of the brush disc shaft 8 is arranged in the second central axis 12 hole, and the brush disc 2 performs reciprocating rotation around the brush disc shaft 8. Through the above-mentioned structural setting, the reciprocating rotation of the brush disc 2 is more stable, and the edge of the brush disc 2 will not rub against the mounting seat 11 at the first end of the brush rod 1 to generate noise.

[0037] Furthermore, it also includes a stop pin 9, an annular groove 24 is provided at one end of the transmission block 21 away from the U-shaped ball head shaft 5, a positioning hole corresponding to the annular groove 24 is provided on the mounting seat 11 of the brush rod 1, the tail end of the stop pin 9 passes through the positioning hole and is placed in the annular groove 24, and the tail end of the stop pin 9 is movably matched with the annular groove 24. Through the above-mentioned structural setting, the brush disc 2 can be prevented from being separated from the mounting seat 11 when working.

[0038] Furthermore, the end of the mounting portion 42 that abuts against the compensation spring 6 is provided with a first limit block 43, the end of the limit bracket 7 that abuts against the compensation spring 6 is provided with a second limit block 71, one end of the compensation spring 6 is sleeved on the first limit block 43, and the other end of the compensation spring 6 is sleeved on the second limit block 71. Through the above structural arrangement, the position of the compensation spring 6 can be better limited, so that the compensation spring 6 works more stably.

[0039] Further, the limiting bracket 7 is provided with a first through hole 72, the driving shaft 3 passes through the first through hole 72 and is fixedly connected to the mounting portion 42 of the eccentric structure 4, a buckle 73 is provided on the outer side of the limiting bracket 7, a slot 13 is provided inside the brush rod 1, the limiting bracket 7 is installed inside the brush rod 1, and the buckle 73 is placed in the slot 13. Through the above structural setting, it is convenient for the limiting bracket 7 to be installed and fixed inside the brush rod 1.

[0040] Furthermore, the brush rod 1 is integrally formed with the mounting seat 11. Through the above-mentioned structural arrangement, the electric toothbrush has a better overall shape and better structural strength.

[0041] In actual operation, the power transmission process of the utility model is as follows:

[0042] The driving shaft 3 rotates counterclockwise, driving the inward eccentric structure 4 connected thereto to rotate counterclockwise, and at the same time driving the U-shaped ball head shaft 5 to drive the brush plate 2 to rotate and swing back and forth. Figure 6 As shown in a, when the eccentric portion 41 of the eccentric structure 4 rotates to the left limit point, the U-shaped ball head shaft 5 drives the brush plate 2 to rotate rightward to the maximum swing angle; the drive shaft 3 continues to rotate counterclockwise, as shown in FIG. Figure 6 As shown in b, when the eccentric portion 41 of the eccentric structure 4 rotates to the lower limit point, the U-shaped ball head shaft 5 drives the brush plate 2 to rotate left to the middle position; the drive shaft 3 continues to rotate counterclockwise, as shown in FIG. Figure 6 As shown in FIG. 3 , when the eccentric portion 41 of the eccentric structure 4 rotates to the right limit point, the U-shaped ball head shaft 5 drives the brush plate 2 to rotate leftward to the maximum swing angle; the drive shaft 3 continues to rotate counterclockwise, as shown in FIG. Figure 6 As shown in FIG. d, when the eccentric portion 41 of the eccentric structure 4 rotates to the upper limit point, the U-shaped ball head shaft 5 drives the brush plate 2 to rotate rightward to the middle position; the drive shaft 3 continues to rotate counterclockwise, and the brush plate 2 repeatedly performs the above-mentioned reciprocating swing through the U-shaped ball head shaft 5.

[0043] The above description is only a preferred embodiment of the present utility model, so all equivalent changes or modifications made according to the structure, features and principles described in the scope of the present utility model patent application are included in the scope of the present utility model patent application.

Claims

1. A rotary electric toothbrush, comprising a brush rod and a brush plate reciprocatingly mounted on a first end of the brush rod, wherein a driving shaft is disposed in the brush rod, characterized in that: It also includes an eccentric structure and a U-shaped ball head shaft, the eccentric structure includes an eccentric part and a mounting part, the first end of the eccentric part is fixedly connected to the first end of the mounting part, the second end of the mounting part is fixedly connected to the first end of the drive shaft, and the central axis of the mounting part coincides with the central axis of the drive shaft, the central axis of the eccentric part and the central axis of the drive shaft are set at an angle of a°, the bottom end of the U-shaped ball head shaft is rotatably connected to the second end of the eccentric part, and the top of the U-shaped ball head shaft is rotatably connected to the transmission block on the bottom side of the brush disc.

2. The rotary electric toothbrush according to claim 1, characterized in that: A connecting hole is provided at the bottom end of the U-shaped ball head shaft, the second end of the eccentric portion is arranged in the connecting hole, and a gap is provided between the outer peripheral wall of the second end of the eccentric portion and the inner wall of the connecting hole.

3. The rotary electric toothbrush according to claim 2, characterized in that: The eccentric portion is a cylindrical structure, and the connecting hole is a cylindrical hole.

4. The rotary electric toothbrush according to claim 1, characterized in that: The transmission block is fixed at the center of the bottom side of the brush plate, and two spherical grooves / spherical protrusions are symmetrically arranged on the transmission block. Spherical protrusions / spherical grooves are symmetrically arranged at both ends of the top of the U-shaped ball head shaft, and the spherical protrusions / spherical grooves on the U-shaped ball head shaft are arranged correspondingly to the grooves / spherical protrusions on the transmission block.

5. The rotary electric toothbrush according to any one of claims 1 to 4, characterized in that: It also includes a compensation spring, a limit bracket is fixedly provided inside the brush rod, the drive shaft is rotatably passed through the limit bracket, the compensation spring is sleeved outside the drive shaft, and one end of the compensation spring is against the limit bracket, and the other end of the compensation spring is against the mounting portion of the eccentric structure.

6. The rotary electric toothbrush according to claim 5, characterized in that: A mounting seat is fixedly provided at the first end of the brush rod, the brush disc is embedded in the mounting seat, a first central axis hole is provided on the transmission block, a second central axis hole is provided in the mounting seat, one end of a brush disc shaft of the brush disc is provided in the first central axis hole, the other end of the brush disc shaft is provided in the second central axis hole, and the brush disc performs reciprocating rotational motion around the brush disc shaft.

7. The rotary electric toothbrush according to claim 5, characterized in that: It also includes a limit pin, an annular groove is provided at one end of the transmission block away from the U-shaped ball head shaft, a positioning hole corresponding to the annular groove is provided on the mounting seat of the brush rod, the tail end of the limit pin passes through the positioning hole and is placed in the annular groove, and the tail end of the limit pin is movably matched with the annular groove.

8. The rotary electric toothbrush according to claim 5, characterized in that: A first limit block is provided at one end of the mounting portion that abuts against the compensation spring, a second limit block is provided at one end of the limit bracket that abuts against the compensation spring, one end of the compensation spring is sleeved on the first limit block, and the other end of the compensation spring is sleeved on the second limit block.

9. The rotary electric toothbrush according to claim 5, characterized in that: The limiting bracket is provided with a first through hole, the driving shaft passes through the first through hole and is fixedly connected to the mounting portion of the eccentric structure, a buckle is provided on the outer side of the limiting bracket, a slot is provided inside the brush rod, the limiting bracket is installed inside the brush rod, and the buckle is placed in the slot.

10. The rotary electric toothbrush according to claim 6, characterized in that: The brush rod and the mounting seat are integrally formed.

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