WO2004098444A1

WO2004098444A1 - Electric toothbrush

Info

Publication number: WO2004098444A1
Application number: PCT/CN2004/000407
Authority: WO
Inventors: Xiaoguo Dai
Original assignee: Xiaoguo Dai
Priority date: 2003-05-09
Filing date: 2004-04-27
Publication date: 2004-11-18
Also published as: CN2609520Y

Abstract

The invention discloses an electric toothbrush, whose brush body (1) comprises a hollow support pipe (2), a mounting part of kettle shape formed on one of the pipe’s ends, and a rotatable shaft (4) formed in the pipe (2). There is a blind hole on the upper end of the brush rotor shaft (4) and the center of the blind hole lies on the axes of the rotor shaft (4). The connecting pin (5) inserted into the blind hole at one end coaxially and tightly, and the other end of the connecting pin (5) is fixed together with a driving bevel gear (6) coaxially and tightly. A side wall is formed on the kettle-shaped mounting part (21) of the pipe (2), and a fixing pin (8) is implanted in it. Both brush supporter (9) and driven bevel gear (7) coaxially formed on the fixing pin and can be made to rotate. The driving bevel gear (6) and driven bevel gear (7) joggles each other, and their central angle less than 90°.

Description

Technical field

The utility model relates to an electric toothbrush, in particular to a connection mechanism of a body part of an electric toothbrush. Background technique

Existing electric toothbrushes generally include a grip portion and a brush body portion, and the brush body portion is detachably connected to the grip portion. The motor installed in the grip part drives the transmission shaft through a driving mechanism, and the brush body part is provided with a rotatable shaft and a rotatable bristle holder. The above-mentioned transmission shaft is connected with Connected at the bottom. The upper end of the rotating shaft of the brush body is connected to the bristle holder through another connecting mechanism.

The US patent US-PS 4156620 discloses a mechanism for connecting a brush body part of an electric toothbrush with a bristle holder. The brush body has a rack link, and each bristle seat of the bristle holder is provided with a gear. All gears in a row of brush holders mesh with each other, and one of every two gears meshes with a connecting rod. When the link moves back and forth, the adjacent bristle holders can rotate in opposite directions to each other. Because there are many gears, and the connecting rod is a rack, the structure is complicated and the volume increases. To prevent the gears from getting stuck, the allowable manufacturing tolerances are small, resulting in high manufacturing costs. Failure to achieve the required manufacturing accuracy may result in malfunction. Furthermore, the rack-and-pinion transmission has the disadvantage of large power loss.

In the Chinese invention patent application with publication number CN 1044041 A, an electric toothbrush is described in which the brush body part is connected to the handle part through a snap joint to realize the disassembly of the brush body. This structure cannot guarantee the smooth operation of the brush body, that is, the brush body may be shaken and moved when it is working. In addition, the lock connector is provided on the outside, which increases the volume of the toothbrush and causes inconvenience in use.

US patent US-PS 4827550 also discloses a mechanism for connecting an electric toothbrush drive shaft and a brush body rotating shaft, wherein an end of the drive shaft adjacent to the brush body rotating shaft has a ring-shaped recessed area, the recessed area is close to the drive shaft. End, thereby forming a tip and a shoulder facing the upper end of the grip portion. The tip is tapered at the end of the drive shaft to facilitate insertion into the shaft of the brush body. Because the volume of the brush body is small, it takes time to process such a tapered tip and shoulder structure, so the production cost is increased.

In addition, US patent US-PS 4827550 and Chinese patent publication number CN 1044041A both disclose the use of a gear as a driving mechanism to drive a transmission shaft. As we all know, this drive device The installation structure is complicated, the power loss is large, so it consumes a lot of power, the transmission efficiency is low, and it is not economical.

The technical problem to be solved by the present utility model is to try to overcome the complicated structure of the connecting mechanism between the rotating shaft of the electric toothbrush brush body and the bristle holder. Difficult processing and high cost; The connecting mechanism between the transmission shaft and the brush body rotating shaft is complicated in structure, difficult to process, and high in cost; the brush body has the disadvantages of unstable rotation, large power loss, large volume, and inconvenience, and provides a small, Electric toothbrush with simple structure, convenient processing and disassembly, smooth rotation of the brush body, low power consumption, low price and convenient use.

The technical solution provided by the present utility model to solve the above problems is: one end of the hollow support tube remote from the grip portion is a pot-shaped mounting portion that is open to one side, and is used to install a driving bevel gear, a driven bevel gear, and a bristle holder. A blind hole is opened at the end of the rotating shaft of the brush body away from the handle. The center of the blind hole is located on the axis of the rotating shaft. One end of a connecting pin is coaxially tightly inserted into the blind hole. The other end of the connecting pin is coaxially equipped with a driving bevel gear, and the connecting pin is closely matched with the driving bevel gear. A fixing pin is inlaid on the side wall of the pot-shaped mounting portion of the hollow support tube, and both the bristle holder and the driven bevel gear are rotatably coaxially mounted on the fixing pin. The driving bevel gear and the driven bevel gear mesh with each other.

The center angle of the driving bevel gear and the driven bevel gear is less than or equal to 90 °.

A groove parallel to the gear axis can also be machined on the side of the driven gear, and a protruding portion parallel to the axis of the bristle holder is protruded from the end face of the bristle holder at the end mating with the driven gear. Partially inserted into the above-mentioned groove of the driven gear, the two adjacent end faces of the driven bevel gear and the bristle holder are installed parallel to each other, so that the bristle holder and the driven bevel gear are synchronously rotated.

A groove can also be machined on the outer wall of one side of the bristle holder, and a restriction pin is inserted into the above four grooves. The other end of the restriction pin is fixed to the top wall of the pot-shaped mounting portion of the hollow support tube. , Can make the bristle holder limited movement along the axial direction of the fixed shaft.

In order to reduce the volume of the toothbrush and make the brush body part rotate smoothly, a blind hole may be provided at the end of the inner surface of the brush body that is in contact with the handle part, and an outward protrusion is provided along the radial side of the hole. At the center of the hole, at least one inward protrusion is provided on the side of the hole opposite to the above side. The handle interface corresponding to the outward protrusion of the blind hole also has an outward protrusion that matches the outward protrusion, and at least one inward protrusion that matches the inward protrusion of the blind hole on the opposite side. The diameter of the grip interface is smaller than the diameter of the middle hole in the brush body.

In a structure of the present invention, an end surface of the brush body rotating shaft that cooperates with the transmission shaft is machined A blind hole extending in the axial direction of the rotating shaft toward the inside of the rotating shaft and having a cross-section in the shape of a round head screw, the round head of the blind hole is divided into an arc larger than a semicircle. The end of the transmission shaft near the end of the rotating shaft of the brush body is inserted into the blind hole, and the transmission shaft is directly connected to the rotating shaft of the brush body.

The utility model also has a structure that the driving mechanism for connecting the motor and the transmission shaft includes a motor driving wheel connected to the motor shaft, an eccentric pin with a longitudinal axis parallel to the longitudinal axis of the driving wheel and eccentric with respect to the driving wheel, and One end of which is closely matched with the drive shaft and has a slot at the other end. One end of the eccentric pin is embedded in the driving wheel, and the other end is inserted into the slot of the fork.

Because the utility model adopts a bevel gear transmission with a center angle less than or equal to 90 °, the volume of the brush body is reduced, and space is saved; one end of the transmission shaft is directly connected to the shaft of the brush body, and the other end is connected to the motor through a fork pin structure. Reduced power loss and improved transmission efficiency; The two sides of the interface between the brush body lining and the grip part are connected by a concave and convex structure, the brush body is easy to install and remove, and the brush body rotates more smoothly; and because the bevel gear can be processed by casting or injection molding It is easy to process, improves efficiency and saves costs. BRIEF DESCRIPTION OF THE DRAWINGS

1 is a schematic longitudinal sectional view of the electric toothbrush according to the present invention;

2 is a schematic longitudinal sectional view of a brush body portion of the electric toothbrush;

Figure 3a is a schematic longitudinal sectional view of a driven bevel gear;

Figure 3b is a schematic side view of a driven bevel gear:

Figure 4a is a schematic longitudinal sectional view of a bristle holder;

Figure 4b is a schematic side view of a bristle holder;

Figure 5a is a schematic longitudinal sectional view of a brush inner liner;

5b is a sectional view taken along the line C-C in FIG. 5a;

6 is a top view of the grip interface;

Figure 7a is a schematic longitudinal sectional view of a brush body rotating shaft mating end with a transmission shaft;

7b is a cross-sectional view taken along G_G of FIG. 7a;

Figure 8a is a schematic front view of a transmission shaft and a fork mounted thereon;

Figure 8b is a side view of Figure 8a;

Figure 8c is a top view of Figure 8a;

FIG. 9 is a connection schematic diagram of a motor driving mechanism and a transmission shaft. The same reference numerals in the drawings denote the same components. detailed description

FIG. 1 is a schematic longitudinal sectional view of the electric toothbrush according to the present invention. The electric toothbrush according to the present invention includes a grip portion 22 and a brush body portion 1, and the grip portion 22 includes a transmission shaft 11, a grip housing 12. 12, a driving mechanism 13, a motor 15, and a battery 17.

Fig. 2 is a schematic longitudinal sectional view of the electric toothbrush brush body portion 1. The brush body part 1 includes a hollow support tube 2 in which a brush body rotating shaft 4 is installed. The rotating shaft 4 is connected to the motor driving mechanism 13 installed in the grip portion 22 through the transmission shaft 11 and the motor driving mechanism 13 and the motor 15 Connected (see Figure 1). After the power is turned on, the motor 15 rotates and drives the transmission shaft 1 1 through the driving mechanism 13 so that the rotating shaft 4 reciprocates. The rotation direction is shown by the double-headed arrow A in the figure.

One end of the hollow support tube 2 remote from the handle portion 22 is a pot-shaped mounting portion 21 which is open to one side, and is used to install a driving bevel gear 6 and a driven bevel gear 7 and a bristle holder 9. A blind hole is opened at the end of the rotating shaft 4 of the brush body away from the handle. The center of the blind hole is located on the axis of the rotating shaft 4. One end of the connecting pin 5 is coaxially tightly inserted into the blind hole, that is, the connecting pin 5 Can neither rotate nor move relative to the axis of rotation 4. The other end of the connecting pin 5 is coaxially provided with a driving bevel gear 6. The connecting pin 5 is closely fitted with the driving bevel gear 6, that is, the gear 6 can neither rotate nor move relative to the connecting pin 5. A fixing pin 8 is inlaid on the side wall of the pot-shaped mounting portion 21 of the hollow support tube 2 of the brush body portion 1, and the bristle holder 9 is rotatably mounted coaxially on the fixing pin 8. The driven bevel gear 7 also cooperates in a dynamic manner. It is coaxially mounted on the fixed pin 8, that is, the driven gear 7 can rotate or move relative to the fixed pin 8. The above-mentioned driving bevel gear 6 and driven bevel gear 7 mesh with each other.

In a preferred embodiment, the center angles of the driving bevel gear 6 and the driven bevel gear 7 are less than or equal to 90 ° (see FIG. 3b).

The bristle holder 9 is rotatably mounted coaxially on the fixing pin 8. The angle of rotation of the bristle holder 9 can be increased or decreased by selecting the center angle of the bevel gears 6, 7 described above.

Materials suitable for manufacturing the bevel gear include metal and plastic, and the bevel gear can be processed by casting or injection molding.

FIG. 3 a is a schematic longitudinal sectional view of the driven bevel gear 7; FIG. 3 b is a schematic side view of the driven bevel gear 7. As can be seen from Figures 3a and 3b, in order to make the bristle holder 9 and the driven gear 7 the same In the step rotation, a groove 311 parallel to the axis of the gear can be machined on the driven gear 7 side-sliding radially, and a parallel to the bristle holder 9 can be protruded from the end surface of the bristle holder 9 mating with the driven gear 7 A protruding portion 411 of the axis (see FIG. 4) is inserted into the groove 311 of the driven gear 7 so that two adjacent end surfaces of the driven bevel gear 7 and the bristle holder 9 are parallel to each other, so that the bristle holder 9 and The driven bevel gear 7 rotates synchronously.

Fig. 4a is a schematic longitudinal sectional view of the bristle holder 9; Fig. 4b is a schematic side view of the bristle holder 9; A groove 412 is machined on the outer wall of the bristle holder 9 side, and a restriction pin 10 is inserted into the groove 412. The other end of the restriction pin 10 is fixed to the top wall of the pot-shaped mounting portion 21 of the hollow support tube 2. In this way, with this structure, the bristle holder 9 can be limitedly moved in the axial direction of the fixing pin 8.

Fig. 5a is a schematic longitudinal sectional view of the brush inner liner 3; Fig. 5b is a C-C sectional view of Fig. 5a; and Fig. 6 is a top view of the handle interface 20. A blind hole 511 is provided at the end of the brush body village 3 connected to the handle portion 22, and an outward protrusion 512 is provided along one side of the radial direction of the hole 511, and the protrusion 512 is located at the center of the hole 511. The side opposite to the above side of 511 is provided with at least one inward protrusion 513 (see Figs. 5a and 5b). The corresponding side of the handle interface 20 corresponding to the outward protrusion 512 of the blind hole 511 also has an outward protrusion 612 that matches the outward protrusion 512, and at least one inward protrusion 513 that matches the blind hole 511 on the opposite side. The matching inward projection 613 (see Figure 6). The diameter of the grip interface 20 is smaller than the diameter of the blind hole 511 in the inner liner 3 of the brush.

Of course, an inward protrusion 513 may also be provided on the above-mentioned opposite side of the blind hole 511, and in addition to the inward protrusion 613 that is matched with the inward protrusion 513 of the blind hole 511, the grip interface 20 is further provided with an inward protrusion The inward protrusions 613 are longitudinally aligned with the inward protrusions 614. Since the inner side of the brush body 3 and the two sides of the handle part interface 20 are connected by a concave and convex structure (512, 513, 612, 613, 614), the volume of the toothbrush is reduced, the brush body is easy to install and disassemble, and the brush body rotates more smoothly.

Fig. 7a is a schematic longitudinal sectional view of the mating shaft 4 of the brush body at the mating end with the transmission shaft 11; Fig. 7b is a sectional view taken along the line G-G of Fig. 7a. In order to reduce the power loss when the driving shaft 11 drives the brush body rotating shaft 4, an end surface of the brush body rotating shaft 4 that cooperates with the driving shaft 11 is processed to extend along the axial direction of the rotating shaft 4 toward the inside of the rotating shaft 4 and has a cross section of: A blind hole 7if in the shape of a round head screw, and a round portion 712 of the blind hole 7if has an arc shape larger than a semicircle, and an end of the transmission shaft 11 matched with the blind hole 7if is directly inserted into the blind hole 711.

Fig. 8a is a schematic front view of a transmission shaft 11 and a shift fork 19 mounted thereon; Fig. 8b is a view of Fig. 8a Figure 8c is a top view of Figure 8a. FIG. 9 is a connection diagram of the motor driving mechanism 13 and the transmission shaft 11. The driving mechanism 13 connecting the motor 15 and the transmission shaft 11 includes a motor driving wheel 14 connected to the shaft of the motor 15, and an eccentric pin 18 having a longitudinal axis parallel to the longitudinal axis of the driving wheel 14 and eccentric with respect to the driving wheel 14. One end is in close contact with the drive shaft 11 and the other end is a fork 19 with a slot 819. One end of the eccentric pin 18 is embedded in the driving wheel 14 and the other end is inserted into the slot 819 of the fork 19 (Fig. 9). .

When the motor 15 installed in the grip portion 22 drives the driving wheel 14 to rotate in the direction shown by the arrow E through its output shaft (Figs. 1, 9), the eccentric pin gauge 18 embedded in the driving wheel 14 at one end follows the fork 19 The reciprocating movement in the slot 819 causes the transmission shaft 11 to reciprocate in the direction shown by the double-headed arrow A (Figure 1, 9), thereby driving the brush body rotating shaft 4 to reciprocate in the direction shown by the double-headed arrow A (Figure 1 or 2). ). Driven by the rotating shaft 4, the connecting pin 5 rotates accordingly, and the driving bevel gear 6 closely matching the pin 5 is rotated. The driven gear 7 is driven to mesh with the driven gear 7 through the driving gear 6, so that the bristle holder 9 reciprocates in the direction shown by the bidirectional arrow B (FIG. 1 or 2). Due to the restriction pin 10, the bristle holder 9 can be limitedly moved along the axial direction of the fixing pin 8.

The specific embodiments of the present invention have been described above with reference to the accompanying drawings. Obviously, the present invention is not limited thereto, and various modifications made within the scope of the present invention do not exceed the protection scope of the present invention.

Claims

Rights request

1. An electric toothbrush comprising a grip portion (22) and a brush body portion (1) with an inner lining (3), the brush body portion being detachably connected to the grip portion (22) and mounted on the grip The motor (15) in the part (22) drives the transmission shaft (11) through a driving mechanism (13). The brush body part (1) includes a hollow support tube (2) with a pot-shaped mounting part (21) at one end. A rotatable shaft (4 is installed in the tube (2), and a driving bevel gear (6) and a driven bevel gear are installed in the pot-shaped mounting portion (21).

(7) and the bristle holder (9), which are characterized in that: one end of the shaft (4) of the brush body away from the handle part (22) is provided with a blind hole, and the center of the blind hole is located on the axis of the shaft (4), one One end of the connecting pin (5) is coaxially tightly inserted into the blind hole, and the other end of the connecting pin (5) is coaxially equipped with a driving bevel gear (6), and the connecting pin (5) and the driving bevel gear ( 6) Tight fitting; a fixing pin (8) is inlaid on the side wall of the pot-shaped mounting portion (21) of the hollow support tube (2), and the bristle holder (9) and the driven bevel gear (7) are rotatable. Coaxially mounted on the fixed pin (8); the driving bevel gear (6) and the driven bevel gear (7) mesh with each other.

2. The electric toothbrush according to claim 1, wherein the center angles of the driving bevel gear (6) and the driven bevel gear (7) are less than or equal to 90 °.

3. The electric toothbrush according to claim 1 or 2, characterized in that: a groove (311) parallel to the axis of the gear is slid radially processed on one side of the driven bevel gear (7), and A protruding portion (411) parallel to the axis of the bristle holder (9) protrudes from the end face of the end mated with the driven bevel gear (7), and the protruding portion (411) is inserted into the driven bevel gear (7) In the groove (311), two adjacent end faces of the driven bevel gear (7) and the bristle holder (9) are parallel to each other.

4. The electric toothbrush according to claim 3, characterized in that: an outer wall on one side of the bristle holder (9) is provided with a four groove (412), and a restriction pin (10) is inserted into the groove (412), The other end of the restriction pin (10) is fixed on the top wall of the pot-shaped mounting portion (21) of the hollow support tube (2).

5. The electric toothbrush according to claim 4, characterized in that: a blind hole (511) is provided at an end of the brush body lining (3) connected with the handle portion (22), and the diameter of the hole (511) is provided. An outward protrusion (512) is provided on the side facing toward the center, and the protrusion (512) is located at the center of the hole (511). At least one inward protrusion is provided on the side of the hole (511) opposite to the above side ( 513); grip The corresponding side of the mouth (20) corresponding to the outward protrusion (512) of the blind hole (511) also has an outward protrusion (612) matching the outward protrusion (512), and at least one on the opposite side. The diameter of the grip interface (20) is smaller than the diameter of the blind hole (511) in the brush inner lining (3) for the inward protrusion (613) matching the inward protrusion (513) of the blind hole (511).

6. The electric toothbrush according to claim 5, characterized in that: an end surface of the end of the brush body rotating shaft (4) that cooperates with the transmission shaft (11) is machined with an axial direction of the rotating shaft (4) toward the rotating shaft ( 4) A blind hole (711) extending in the cross section in the shape of a round head screw, and the round head portion (712) of the blind hole (711) is an arc larger than a semicircle.

7. The electric toothbrush according to claim 6, wherein the driving mechanism (13) includes a motor driving wheel (14) connected to a motor shaft, and a longitudinal axis is parallel to the driving wheel

The eccentric pin (18) whose longitudinal axis is eccentric with respect to the drive wheel (14) and a shift fork (19) with a slot (819) on one end closely matching the drive shaft (11), the above eccentricity One end of the pin (18) is inserted into the drive wheel (14), and the other end is inserted into the slot (819) of the fork (19).