CN114652473B - Piston drive assembly for an oral care device and oral care device - Google Patents

Abstract

The application provides a piston drive assembly and oral care device for oral care device does not be provided with gear drive structure in the piston drive assembly, has reduced friction and noise that gear drive structure brought, also can not lead to partial tooth side wearing and tearing great because of the effort difference when reciprocating motion to the location of piston is more accurate, helps reducing the wearing and tearing of piston, and this piston drive assembly's life will be longer. Meanwhile, the piston driving assembly directly transmits torque generated by the driving shaft to the transmission part through the eccentric part, and the transmission part drives the piston to reciprocate, so that the transmission efficiency between the driving shaft and the piston is improved.

Description

Piston drive assembly for an oral care device and oral care device

Technical Field

The application relates to the technical field of oral care equipment, in particular to a piston driving assembly for an oral care device and the oral care device.

Background

The piston pump assembly is a core component of an oral care device such as a tooth washer and the like, in the existing oral care device, the piston pump assembly comprises a piston cylinder and a piston matched in the piston cylinder, the piston is usually driven by a gear transmission structure, teeth of a driving motor are meshed with transmission teeth of the gear transmission structure to reduce and increase moment, and meanwhile, eccentrically arranged motor teeth convert rotary motion into linear motion of the piston so as to change the pressure in the piston cylinder and realize driving of fluid.

In this process, the teeth of the motor mesh with the drive teeth, which produces a loud gear noise. Meanwhile, in the process of pumping in fluid and pumping out fluid, the stress of the gears is uneven, so that when the gears are meshed, the stress of the transmission teeth on one side is larger and the stress of the transmission teeth on the other side is smaller, and the service life of the gears is greatly reduced.

Disclosure of Invention

The application provides a piston drive assembly for an oral care device and the oral care device to solve the technical problem of noise and uneven stress caused by gear transmission therein.

A first aspect of the present application provides a piston drive assembly for an oral care device comprising a drive shaft, an eccentric, a transmission, and a piston. Wherein the drive shaft has an axis of rotation; the eccentric part is fixedly connected to the driving shaft and is provided with an eccentric part which is arranged offset from the rotation axis; the transmission piece is connected to the eccentric part; a piston connected to the transmission; the driving shaft can drive the eccentric part to rotate along the rotation axis, so that the driving part drives the piston to reciprocate.

In some embodiments, the eccentric is a connecting rod, one end of the connecting rod is connected to the driving shaft, the eccentric part is positioned at the other end of the connecting rod, and the eccentric part is connected with the transmission part, the transmission part and the piston through hinges; alternatively, the eccentric member has a first end face and a second end face opposite to each other, the first end face is provided with a connecting portion on one side, the connecting portion is coaxially arranged with the rotation axis and connected to the driving shaft, and the eccentric portion is located on one side of the second end face.

In some embodiments, the eccentric comprises a body and a connection disposed on the body, the connection being disposed coaxially with the rotational axis and connected to the drive shaft; the transmission part is provided with a matching part, the eccentric part extends outwards from the body and is matched with the matching part, so that the transmission part can drive the piston to move along a first direction, and the first direction is perpendicular to the rotation axis.

In some embodiments, a first bearing is disposed within the mating portion, one of the eccentric portion and the mating portion is rotationally mated with the first bearing, and the other is fixed with the first bearing; or the eccentric part and the matching part are fixed; or, the matching part is provided with an opening arranged along a second direction, and the second direction is perpendicular to the first direction and the rotation axis.

In some embodiments, a columnar connector is connected to the eccentric portion, and one end of the columnar connector, which is far away from the body, is provided with a flange extending towards the outer side in the circumferential direction; the cooperation portion internal fixation is provided with first bearing, the column connecting piece normal running fit is in the first bearing, and the body with the opposite side of flange is pressed respectively on the both sides terminal surface of first bearing.

In some embodiments, the transmission member has a connection end, a mating groove is disposed on the piston corresponding to the connection end, the connection end is mated in the mating groove, and a gap is formed between the connection end and the mating groove in a second direction, and the second direction is perpendicular to both the first direction and the rotation axis.

In some embodiments, the connecting portion is a connecting groove, the driving shaft is matched in the connecting groove, and one side of the connecting groove is provided with a positioning hole extending along the radial direction of the rotation axis; the piston drive assembly for an oral care device further includes an axial locating pin passing through the locating hole and abutting against an outer sidewall of the drive shaft.

Accordingly, a second aspect of the present application provides a piston drive assembly for an oral care device comprising a drive shaft, an eccentric, a transmission, a piston, and a piston cylinder. Wherein the driving shaft has a rotation axis; the eccentric member is connected to the drive shaft and has an eccentric portion disposed offset from the rotational axis; the transmission piece is connected to the eccentric part; a piston connected to the transmission; the piston cylinder is provided with an inner cavity extending along a first direction, the first direction is arranged at an angle with the rotation axis, and the piston is matched in the inner cavity; the driving shaft can drive the eccentric part to rotate along the rotation axis, so that the transmission part drives the piston to reciprocate along the first direction.

In some embodiments, the first direction is substantially perpendicular to the axis of rotation.

Accordingly, a third aspect of the present application provides an oral care device comprising a drive member, an eccentric member, a transmission member, a piston, and a piston cylinder. Wherein the driving member has a driving shaft, the driving shaft has a rotation axis; the eccentric part is fixedly connected to the driving shaft and is provided with an eccentric part which is arranged offset from the rotation axis; the transmission piece is connected to the eccentric part; a piston connected to the transmission; the piston cylinder has an inner cavity with a liquid inlet and a liquid outlet, and at least part of the piston is accommodated in the inner cavity. The driving shaft can drive the eccentric part to rotate along the rotation axis, so that the driving part drives the piston to reciprocate in the inner cavity.

In some embodiments, the oral care device further comprises a carrier having a receiving cavity and an opening communicating to the receiving cavity, the eccentric, transmission, piston, and piston cylinder being disposed within the receiving cavity, the drive shaft being connected to the eccentric by the opening; and the second bearing is arranged in the accommodating cavity, is coaxially arranged with the rotation axis and is in rotating fit with the eccentric part.

In some embodiments, the eccentric comprises a first shaft section and a second shaft section connected, the axes of the first shaft section and the second shaft section are approximately parallel, the first shaft section is coaxially arranged with the driving shaft for connecting the driving shaft, and the eccentric part is positioned on the second shaft section.

In some embodiments, a boss is formed at an end of the second shaft section adjacent to the first shaft section, the second bearing is fitted on the first shaft section, and opposite two wall surfaces of the second bearing are abutted by an inner wall of the carrier and the boss.

In some embodiments, the eccentric is a connecting rod, one end of the connecting rod is connected to the driving shaft, the eccentric part is positioned at the other end of the connecting rod, and the eccentric part is connected with the transmission part, the transmission part and the piston through hinges; alternatively, the eccentric member has a first end face and a second end face opposite to each other, the first end face is provided with a connecting portion on one side, the connecting portion is coaxially arranged with the rotation axis and connected to the driving shaft, and the eccentric portion is located on one side of the second end face.

In some embodiments, the eccentric comprises a body and a connection disposed on the body, the connection being disposed coaxially with the rotational axis and connected to the drive shaft; the transmission part is provided with a matching part, the eccentric part extends outwards from the body and is matched with the matching part, so that the transmission part can drive the piston to move along a first direction, and the first direction is perpendicular to the rotation axis.

In some embodiments, a first bearing is disposed within the mating portion, one of the eccentric portion and the mating portion is rotationally mated with the first bearing, and the other is fixed with the first bearing; or,

the eccentric part and the matching part are fixed; or, the matching part is provided with an opening arranged along a second direction, and the second direction is perpendicular to the first direction and the rotation axis.

In some embodiments, a columnar connector is connected to the eccentric portion, and one end of the columnar connector, which is far away from the body, is provided with a flange extending towards the outer side in the circumferential direction; the cooperation portion internal fixation is provided with first bearing, the column connecting piece normal running fit is in the first bearing, and the body with the opposite side of flange is pressed respectively on the both sides terminal surface of first bearing.

In some embodiments, the transmission member has a connection end, a mating groove is disposed on the piston corresponding to the connection end, the connection end is mated in the mating groove, and a gap is formed between the connection end and the mating groove in a second direction, and the second direction is perpendicular to both the first direction and the rotation axis.

In some embodiments, the connecting portion is a connecting groove, the driving shaft is matched in the connecting groove, and one side of the connecting groove is provided with a positioning hole extending along the radial direction of the rotation axis; the piston drive assembly for an oral care device further includes an axial locating pin passing through the locating hole and abutting against an outer sidewall of the drive shaft.

The application has the following beneficial effects: in the piston drive assembly for an oral care device and the oral care device provided by the application, the gear transmission structure is not arranged, friction and noise caused by the gear transmission structure are reduced, and partial tooth side abrasion of the gear transmission structure is not larger due to different acting forces during reciprocating motion. And moreover, the eccentric part and the driving shaft are assembled conveniently and quickly, and position deviation is not easy to generate, so that the assembly precision of the whole structure is improved, and the assembly process is simplified. Meanwhile, the piston driving assembly for the oral care device of the embodiment directly transmits torque generated by the driving shaft to the transmission part through the eccentric part, and the transmission part drives the piston to reciprocate, so that the transmission efficiency between the driving shaft and the piston is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 illustrates an exploded view of a piston drive assembly for an oral care device in an embodiment of the present application.

Fig. 2 illustrates a front view, in semi-section, of a piston drive assembly for an oral care device in an embodiment of the present application.

The major component reference numerals in this application are as follows:

motor 110 driving shaft 111

Eccentric part 121 of eccentric member 120

First shaft section 1221 of body 122

Second shaft section 1222 connecting part 123

Positioning hole 1231 first end surface 124

Second end face 125 boss 126

Matching part 131 of transmission member 130

Piston 140 at connecting end 132

Axial positioning pin 150 of mating groove 141

Flange 161 of columnar connector 160

First bearing 170 piston cylinder 180

Second bearing 190 carrier 310

First carrier 311 opening 3111

Second carrier 312 fixing member 320

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, based on the embodiments herein, which are within the scope of the protection of the present application, will be within the skill of the art without inventive effort. Furthermore, it should be understood that the detailed description is presented herein for purposes of illustration and explanation only and is not intended to limit the present application. In this application, unless otherwise indicated, terms of orientation such as "upper", "lower", "left" and "right" are generally used to refer to the directions of the drawings in which the device is actually used or in an operating state.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature.

The present application provides a piston drive assembly for an oral care device and an oral care device, each of which is described in detail below. It should be noted that the following description order of the embodiments is not intended to limit the preferred order of the embodiments of the present application. In the following embodiments, the descriptions of the embodiments are focused on, and for the part that is not described in detail in a certain embodiment, reference may be made to the related descriptions of other embodiments.

Referring to fig. 1-2, embodiments of the present application provide a piston drive assembly for an oral care device that includes a drive shaft 111, an eccentric 120, a transmission 130, and a piston 140.

Wherein the driving shaft 111 is used for providing driving force for the rotation of the eccentric 120, and has a rotation axis. For example, referring to fig. 2, in the present embodiment, a motor 110 is shown, the motor 110 having the drive shaft 111, the drive shaft 111 having an axis of rotation a.

The eccentric 120 is fixedly connected to the drive shaft 111 and has an eccentric portion 121 arranged offset from the axis of rotation a, i.e. the central axis of the eccentric portion 121 is not coaxial with the axis of rotation a. Here, the eccentric 120 is fixedly connected to the driving shaft 111, so that the eccentric 120 can be simultaneously rotated about the rotation axis when the driving shaft 111 rotates. The drive shaft 111 and the eccentric member 120 adopt a fixed connection mode, but do not adopt a gear meshing connection mode, so that friction is reduced, transmission efficiency is increased, service life of the whole structure is prolonged, and transmission noise can be reduced due to the fact that no gear is matched.

The driving member 130 is connected to the eccentric portion 121, so that the driving member 130 can reciprocate under the driving of the eccentric portion 121. Referring to fig. 1, in the present embodiment, the transmission member 130 is substantially rod-shaped, and one end of the transmission member 130 is connected to the eccentric portion 121 and the other end is connected to the piston 140. When the eccentric 120 rotates along the rotation axis a, the eccentric portion 121 also rotates along the rotation axis a. Since the eccentric portion 121 is disposed offset from the rotation axis, the transmission member 130 connected to the eccentric portion 121 will reciprocate with the rotation of the eccentric portion 121, thereby reciprocating the piston 140. It will be appreciated that in other embodiments, the driving member 130 may be coupled to the eccentric 121 and/or the piston 140 by other means, and is not limited to being coupled by an end thereof.

It can be seen that, in the piston driving assembly for an oral care device provided in this embodiment, the gear transmission structure is not provided, so that friction and noise caused by the gear transmission structure are reduced, partial tooth side abrasion of the gear transmission structure is not caused by different forces during reciprocating motion, and the positioning of the piston 140 is more accurate, so that the stress is more uniform, the abrasion of the piston 140 is reduced, and the service life of the piston driving assembly is longer. In addition, the eccentric member 120 and the driving shaft 111 are assembled conveniently and quickly, and position deviation is not easy to occur, so that the assembly precision of the whole structure is improved, and the assembly process is simplified. Meanwhile, the piston driving assembly for an oral care device of the present embodiment directly transmits the torque generated by the driving shaft 111 to the transmission member 130 through the eccentric member 120, and the transmission member 130 drives the piston 140 to reciprocate, so that the transmission efficiency between the driving shaft 111 and the piston 140 is improved.

In some embodiments, referring to fig. 2, the eccentric 120 includes a body 122 and a connecting portion 123 disposed on the body 122, the connecting portion 123 being disposed coaxially with the rotation axis and connected to the driving shaft 111. In this embodiment, the connecting portion 123 is a connecting groove, the connecting groove is configured to be contoured with the driving shaft 111, and the driving shaft 111 is fitted in the connecting groove. For example, when the cross section of the driving shaft 111 is D-shaped, the connecting groove is correspondingly a D-shaped groove. And, one side of the connection groove is provided with a positioning hole 1231 extending in a radial direction of the rotation axis. The piston drive assembly for an oral care device further comprises an axial locating pin 150, the axial locating pin 150 extending radially through the locating hole 1231 and abutting against the outer sidewall of the drive shaft 111. Here, the connection portion 123 circumferentially fixes the driving shaft 111, and the axial positioning pin 150 axially fixes the driving shaft 111, so as to achieve a fixed connection between the driving shaft 111 and the eccentric member 120, thereby ensuring accurate positions and reliable connection between the eccentric member 120 and the driving shaft 111.

The transmission member 130 has a mating portion 131, and the eccentric portion 121 extends outward from the body 122 and mates with the mating portion 131, so that the transmission member 130 can drive the piston 140 to move along a first direction, referring to fig. 2, a front-back direction of a straight line where the dash-dot line B is located is the first direction, and the first direction is disposed at an angle with the rotation axis. Here, the motion direction of the driving member 130 driving the piston 140 is perpendicular to the direction of the rotation axis of the driving shaft 111, so that the size of the piston driving assembly in the first direction is reduced, which saves the size space requirement in the first direction and contributes to achieving a compact structural arrangement.

In some implementations, as shown in fig. 2, the eccentric portion 121 is a connecting groove, and a columnar connecting member 160 is connected to the eccentric portion 121, and the columnar connecting member 160 may be interference fit in the connecting groove. The end of the cylindrical connector 160 remote from the body 122 has a flange 161 extending circumferentially outward. The first bearing 170 is fixedly disposed in the mating portion 131, for example, the first bearing 170 is fixed in the mating portion 131 by encapsulation, where the mating portion 131 is a through hole, and in other embodiments, the mating portion may be a slot, etc. The columnar connector 160 is rotatably fitted in the first bearing 170, and opposite side surfaces of the body 122 and the flange 161 are respectively pressed against opposite side end surfaces of the first bearing 170. Here, the mating connection of the eccentric 120 with the transmission member 130 is achieved by the columnar connection 160, and the position of the transmission member 130 can be defined so as to be stable in position and uniform in stress. When the eccentric portion 121 rotates, the driving member 130 can be driven to move by the columnar connecting member 160, so as to drive the piston 140 to reciprocate. Meanwhile, due to the arrangement of the first bearing 170, when the columnar connecting piece 160 drives the transmission piece 130 to move, the friction between the columnar connecting piece and the transmission piece is small. It will be appreciated that in other embodiments, one of the eccentric portion 121 and the engaging portion 131 may be in rotational engagement with the first bearing 170, and the other may be fixed to the first bearing 170, that is, the first bearing 170 may be fixedly connected to the eccentric portion 121 and in rotational engagement with the engaging portion 131. Alternatively, in other embodiments, the eccentric portion 121 may be fixedly connected to the transmission member 130, for example, by the columnar connection member 160.

In some embodiments, referring to fig. 2 again, in order to further convert the periodic oscillation into the movement of the piston 140 along the first direction, a spherical connecting end 132 is disposed at the end of the transmission member 130 near the piston 140, a mating groove 141 is disposed on the piston 140 corresponding to the connecting end, and a gap is formed between the connecting end 132 and the mating groove 141 in the second direction when the connecting end 132 is mated in the mating groove 141, and the second direction is perpendicular to both the first direction and the rotation axis, specifically, in this embodiment, the inner diameter of the mating groove 141 is larger than the outer diameter of the connecting end 132. It will be appreciated that the size of the gap is specifically set according to the movement stroke of the transmission member 130 in the second direction when it rotates. Here, in the present embodiment, the extending direction of the piston cylinder 180, that is, the moving direction of the piston 140 is taken as the first direction. When the transmission member 130 swings reciprocally, it generates a relative displacement in the second direction with respect to the piston 140, and drives the piston 140 to reciprocate along the first direction through the engagement of the connection end 132 with the engagement groove 141. It will be appreciated that in other embodiments, the connecting end 132 and the mating groove 141 are not limited to being spherical, and may be other shapes, but the arcuate contact surface helps to make the drive fit therebetween less friction and more compliant.

In other implementations, the connection between the eccentric portion and the mating portion may be implemented using other structures. Illustratively, the mating portion has an opening disposed along a second direction, the second direction being perpendicular to both the first direction and the axis of rotation. The piston is driven to do linear reciprocating motion through the eccentric motion of the eccentric part in sliding fit with the opening hole.

In other embodiments, unlike the previous embodiments, the eccentric is a connecting rod, one end of the connecting rod is connected to the driving shaft, the eccentric is located at the other end of the connecting rod, and the eccentric is connected to the driving member, the driving member and the piston through hinges. When the driving shaft rotates along the rotation axis, the connecting rod is driven to rotate and drive the piston to realize linear reciprocating motion.

In some embodiments, referring again to fig. 1, the eccentric 120 has a first end surface 124 and a second end surface 125 opposite to each other, the connecting portion 123 is located on the first end surface 124 side, and the eccentric portion 121 is located on the second end surface 125 side. Here, the connection portion 123 and the eccentric portion 121 are respectively disposed at both sides of the eccentric member 120, so that connection between the two and the driving shaft 111 and the transmission member 130 is facilitated, and mutual interference is not easily generated when the driving shaft 111 and the transmission member 130 are connected to the eccentric member 120. It will be appreciated that in other embodiments, the connecting portion 123 and the eccentric portion 121 may be located on the same side end face of the eccentric 120.

As an example, with continued reference to fig. 1 and 2, the eccentric 120 includes a first shaft segment 1221 and a second shaft segment 1222 that are connected, with the axes of the first shaft segment 1221 and the second shaft segment 1222 being substantially parallel. The first end surface 124 is formed on the first shaft section 1221, and the first shaft section 1221 is disposed coaxially with the drive shaft 111 for connection to the drive shaft 111. The second shaft section 1222 has the second end surface 125 formed thereon, and the eccentric portion 121 is located on the second shaft section 1222. Here, the first shaft section 1221 and the second shaft section 1222 are integrally formed, which helps to reduce the assembly process of the components. It will be appreciated that the first shaft section 1221 and the second shaft section 1222 may also be integrally assembled after being manufactured separately, and the separate manufacturing facilitates the manufacture of small parts, the miniaturization of the eccentric 120, and the reduction of the size of the eccentric 120 to suit use scenarios where miniaturization is required.

Here, a boss 126 is further formed at an end of the second shaft section 1222 near the first shaft section 1221, and when a second bearing 190 is assembled at an outer wall of the first shaft section 1221, the boss 126 may be used to abut one end surface of the second bearing 190 so as to locate and assemble the second bearing 190.

To better achieve the technical effect of the embodiments of the present application, embodiments of the present application also provide a piston drive assembly for an oral care device that includes a drive shaft 111, an eccentric 120, a transmission 130, a piston 140, and a piston cylinder 180. Wherein the drive shaft 111 has an axis of rotation. The eccentric 120 is connected to the drive shaft 111 and has an eccentric portion 121 arranged offset from the axis of rotation. The transmission member 130 is connected to the eccentric portion 121. The piston 140 is connected to the transmission 130. The piston cylinder 180 has an interior cavity extending in a first direction disposed at an angle to the axis of rotation, in which the piston 140 fits. When the driving shaft 111 rotates, the eccentric member 120 can be driven to rotate along the rotation axis, so that the driving member 130 drives the piston 140 to reciprocate along the first direction.

Here, the rotation axis of the driving shaft 111 is disposed at an angle to the first direction, so that the setting position can be conveniently adjusted according to the actual space requirement, so as to save space, optimize layout and achieve compact structural arrangement.

In some embodiments, the first direction is disposed substantially perpendicular to the axis of rotation to facilitate assembly and to facilitate improved transmission accuracy. Illustratively, the angle between the first direction and the axis of rotation ranges between 80 ° -100 °. For example, the included angle between the two is 80 °, 85 °, 90 °, 100 °, etc. It is to be understood that the present example does not exemplify all the values of the included angle, and in other embodiments, the included angle may be other values within the above range.

It will be appreciated that the piston drive assembly for an oral care device may be used in an oral care device such as a dental washer to provide liquid pumping in and out to the oral care device. Accordingly, in order to better achieve the technical effects of the embodiments of the present application, in the embodiments of the present application, there is also provided an oral care device including a driver, a transmission 130, a piston 140, and a piston cylinder 180. The drive element has a drive shaft 111, which may be a motor, for example, and the drive shaft 111 has an axis of rotation. The eccentric 120 is fixedly connected to the drive shaft 111 and has an eccentric portion 121 arranged offset from the axis of rotation. The transmission member 130 is connected to the eccentric portion 121; the piston 140 is connected to the transmission 130. The piston cylinder 180 has an inner cavity with a fluid inlet and a fluid outlet, and at least a portion of the piston 140 is received in the inner cavity. When the driving shaft 111 works, the eccentric member 120 can be driven to rotate along the rotation axis, so that the driving member 130 drives the piston 140 to reciprocate in the inner cavity.

Wherein, the inlet can be connected to the liquid storage part such as a liquid storage barrel through a liquid inlet pipeline and the like, and the liquid outlet can be connected to the liquid outlet part such as a nozzle through a liquid outlet pipeline and the like so as to clean the oral cavity.

In some embodiments, the eccentric is a connecting rod, one end of the connecting rod is connected to the driving shaft, the eccentric part is positioned at the other end of the connecting rod, and the eccentric part is connected with the transmission part, the transmission part and the piston through hinges; alternatively, the eccentric member 120 has a first end surface 124 and a second end surface 125 opposite to each other, and a connecting portion 123 is provided on one side of the first end surface 124, the connecting portion 123 is coaxially disposed with the rotation axis and connected to the driving shaft 111, and the eccentric portion 121 is provided on one side of the second end surface 125.

In some embodiments, the eccentric 120 includes a body 122 and a connection 123 disposed on the body 122, the connection 123 being disposed coaxially with the rotational axis and connected to the drive shaft 111; the transmission member 130 has a mating portion 131, and the eccentric portion 121 extends outward from the body 122 and mates with the mating portion 131, so that the transmission member 130 can drive the piston 140 to move along a first direction, and the first direction is perpendicular to the rotation axis.

In some embodiments, a first bearing 170 is disposed in the mating portion 131, one of the eccentric portion 121 and the mating portion 131 is rotatably mated with the first bearing 170, and the other is fixed with the first bearing 170; alternatively, the first bearing 170 is disposed in the engaging portion 131, and the eccentric portion 121 and the engaging portion 131 are fixed; or, the matching part is provided with an opening arranged along a second direction, and the second direction is perpendicular to the first direction and the rotation axis.

In some embodiments, a columnar connecting member 160 is connected to the eccentric portion 121, and an end of the columnar connecting member 160 remote from the body 122 has a flange 161 extending outward in a circumferential direction; the first bearing 170 is fixedly disposed in the mating portion 131, the columnar connecting member 160 is rotatably fitted in the first bearing 170, for example, is fixed to an inner ring of the first bearing 170, and opposite side surfaces of the body 122 and the flange 161 are respectively pressed against two side end surfaces of the first bearing 170.

In some embodiments, the connecting portion 123 is a connecting groove, the driving shaft 111 is fitted in the connecting groove, and a positioning hole 1231 extending along a radial direction of the rotation axis is provided at one side of the connecting groove; the piston drive assembly for an oral care device further comprises an axial locating pin 150, the axial locating pin 150 passing through the locating hole 1231 and abutting against the outer sidewall of the drive shaft 111.

In some embodiments, the oral care device further comprises a carrier 310 and a second bearing 190, the carrier 310 having a receiving cavity and an opening 3111 communicating to the receiving cavity, the eccentric 120, the transmission 130, the piston 140 and the piston cylinder 180 being disposed within the receiving cavity, the drive shaft 111 being connected to the eccentric 120 by the opening 3111. The second bearing 190 is disposed within the receiving chamber, coaxially disposed with the axis of rotation, and in rotational engagement with the eccentric 120.

Here, referring to fig. 1, in the present embodiment, the carrier 310 includes a first carrier 311 and a second carrier 312 disposed opposite to each other, and the first carrier 311 and the second carrier 312 may be mutually covered to form the accommodating cavity. Fluid connectors are disposed on the first bearing member 311 corresponding to the liquid inlet and the liquid outlet of the inner cavity, and the fluid connectors can be used for connecting fluid pipelines and the like. The carrier 310 of a split design is easy to manufacture and easy to assemble from the various components therein.

In some embodiments, the eccentric 120 includes a first shaft segment 1221 and a second shaft segment 1222 that are connected, the axes of the first shaft segment 1221 and the second shaft segment 1222 being substantially parallel, and the angle between the two being typically less than or equal to 20 °. The first shaft section 1221 is arranged coaxially with the drive shaft 111 for connecting the drive shaft 111, the eccentric 121 being located on the second shaft section 1222.

Referring to fig. 2 again, in the present embodiment, a boss 126 is further formed at an end of the second shaft section 1222 of the eccentric element 120 near the first shaft section 1221, and two opposite wall surfaces of the second bearing 190 assembled at the outer wall of the first shaft section 1221 are abutted by the inner wall of the first bearing 311 and the boss 126, so as to facilitate positioning and assembling the second bearing 190, and simplify the assembly process of the whole component.

In some embodiments, referring to fig. 1 and 2, the oral care device further comprises a fixing member 320, wherein the fixing member 320 is connected to the carrier member 310, in this example, specifically connected to the first carrier member 311. The fixing member 320 is disposed corresponding to the opening 3111 of the first carrier 311, and the fixing member 320 is provided with a through hole corresponding to the opening 3111. After the motor 110 is mounted to the fixing member 320, the driving shaft 111 may pass through the through hole of the fixing member 320 and be coupled to the eccentric 120 through the opening 3111. Here, the fixing member 320 is provided to facilitate fixing of the motor 110 so as to facilitate installation and replacement of the motor 110.

Application example one

In an example one application, a piston drive assembly for an oral care device is provided, comprising a drive shaft 111, an eccentric 120, a transmission 130, and a piston 140, the piston 140 being part of a liquid pump. The driving shaft 111 is directly connected to the eccentric 120, the eccentric 120 is provided with an eccentric portion 121 offset from the rotation axis of the driving shaft 111, the transmission member 130 is connected to the eccentric portion 121, and the piston 140 is connected to the transmission member 130. When the driving shaft 111 rotates, the eccentric member 120 and the transmission member 130 can be driven to rotate, so as to drive the piston 140 to reciprocate. Compared with a gear transmission mode, the gear transmission device is beneficial to reducing noise, reducing inter-tooth friction and prolonging service life.

Application example two

In application example two, a piston drive assembly for an oral care device is provided that includes a drive shaft 111, an eccentric 120, a transmission 130, a piston 140, and a piston cylinder 180. The piston 140 and piston cylinder 180 are part of a fluid pump. Here, the piston cylinder 180 has an inner cavity disposed in a first direction, and the piston 140 is cooperatively disposed in the piston cylinder 180. The rotation axis of the drive shaft 111 is perpendicular to the first direction. This arrangement makes the overall arrangement of the piston drive assembly for the oral care device more compact, can reduce the occupation space in the first direction, helps adapting to the use requirements of different space scenarios.

Application example three

In application example three, an oral care device is provided, the oral care device being a dental washer. In other examples, the oral care device may also be a toothbrush, a tap with a tooth rinsing function, a medical tooth rinsing device, etc., which is not limited by this example. In the oral care device, there is a structure of the piston drive assembly for an oral care device provided in application example one and/or application example two.

It is to be understood that in the foregoing embodiments, unless otherwise specified, the meanings of terms in the various embodiments are the same, and that the emphasis on the various embodiments may be different, and that details of some embodiments not described in detail may be referred to in other embodiments, and that the exemplary descriptions and technical effects shown in the foregoing embodiments may be correspondingly achieved.

The foregoing has outlined in detail the piston drive assembly for an oral care device and the oral care device provided herein, and the specific examples have been provided herein to illustrate the principles and embodiments of the present application and the description of the examples above is only intended to assist in the understanding of the method of the present application and the core ideas thereof; meanwhile, as those skilled in the art will have modifications in the specific embodiments and application scope in accordance with the ideas of the present application, the present description should not be construed as limiting the present application in view of the above.

Claims (10)

1. A piston drive assembly for an oral care device, comprising,

a driving shaft having a rotation axis;

an eccentric member fixedly connected to the drive shaft and having an eccentric portion disposed offset from the rotational axis;

a transmission member connected to the eccentric portion; and

a piston connected to the transmission member;

the driving shaft can drive the eccentric part to rotate along the rotation axis so that the transmission part drives the piston to reciprocate;

the eccentric part is a connecting rod, one end of the connecting rod is connected to the driving shaft, the eccentric part is positioned at the other end of the connecting rod, and the eccentric part is connected with the transmission part, the transmission part and the piston through hinges; or,

the eccentric piece is provided with a first end face and a second end face which are opposite, one side of the first end face is provided with a connecting part, the connecting part is coaxially arranged with the rotation axis and is connected to the driving shaft, and the eccentric part is positioned on one side of the second end face;

the eccentric piece comprises a body and a connecting part arranged on the body, wherein the connecting part is coaxially arranged with the rotation axis and is connected to the driving shaft;

the eccentric part extends outwards from the body and is matched with the matching part, so that the transmission part can drive the piston to move along a first direction, and the first direction is perpendicular to the rotation axis;

the transmission piece is provided with a connecting end, a matching groove is formed in the piston corresponding to the connecting end, the connecting end is matched in the matching groove, a gap is formed between the connecting end and the matching groove in a second direction, and the second direction is perpendicular to the first direction and the rotation axis.

2. The piston drive assembly for an oral care device as recited in claim 1 wherein,

a first bearing is arranged in the matching part, one of the eccentric part and the matching part is in running fit with the first bearing, and the other is fixed with the first bearing; or,

the eccentric part and the matching part are fixed; or,

the matching part is provided with an opening arranged along a second direction, and the second direction is perpendicular to the first direction and the rotation axis.

3. The piston drive assembly for an oral care device as recited in claim 1 wherein,

the eccentric part is connected with a columnar connecting piece, and one end of the columnar connecting piece, which is far away from the body, is provided with a flange extending outwards along the circumferential direction;

the cooperation portion internal fixation is provided with first bearing, the column connecting piece normal running fit is in the first bearing, and the body with the opposite side of flange is pressed respectively on the both sides terminal surface of first bearing.

4. The piston drive assembly for an oral care device as recited in claim 1 wherein,

the connecting part is a connecting groove, the driving shaft is matched in the connecting groove, and one side of the connecting groove is provided with a positioning hole extending along the radial direction of the rotation axis;

the piston drive assembly for an oral care device further includes an axial locating pin passing through the locating hole and abutting against an outer sidewall of the drive shaft.

5. The piston drive assembly for an oral care device as recited in claim 1, further comprising:

a piston cylinder having an interior cavity extending in the first direction, the piston being fitted in the interior cavity.

6. An oral care device, comprising,

a driving member having a driving shaft, the driving shaft having a rotation axis;

an eccentric member fixedly connected to the drive shaft and having an eccentric portion disposed offset from the rotational axis;

a transmission member connected to the eccentric portion;

a piston connected to the transmission member; and

the piston cylinder is provided with an inner cavity, the inner cavity is provided with a liquid inlet and a liquid outlet, and at least part of the piston is accommodated in the inner cavity;

the driving shaft can drive the eccentric part to rotate along the rotation axis so that the transmission part drives the piston to reciprocate in the inner cavity;

the bearing piece is provided with a containing cavity and an opening communicated with the containing cavity, the eccentric piece, the transmission piece, the piston and the piston cylinder are arranged in the containing cavity, and the driving shaft is connected to the eccentric piece through the opening; and

the second bearing is arranged in the accommodating cavity, is coaxially arranged with the rotating axis and is in rotating fit with the eccentric part;

the eccentric member comprises a first shaft section and a second shaft section which are connected, the axes of the first shaft section and the second shaft section are approximately parallel, the first shaft section and the driving shaft are coaxially arranged for connecting the driving shaft, and the eccentric part is positioned on the second shaft section;

the eccentric part is a connecting rod, one end of the connecting rod is connected to the driving shaft, the eccentric part is positioned at the other end of the connecting rod, and the eccentric part is connected with the transmission part, the transmission part and the piston through hinges; or,

the eccentric piece is provided with a first end face and a second end face which are opposite, one side of the first end face is provided with a connecting part, the connecting part is coaxially arranged with the rotation axis and is connected to the driving shaft, and the eccentric part is positioned on one side of the second end face;

the eccentric piece comprises a body and a connecting part arranged on the body, wherein the connecting part is coaxially arranged with the rotation axis and is connected to the driving shaft;

the eccentric part extends outwards from the body and is matched with the matching part, so that the transmission part can drive the piston to move along a first direction, and the first direction is perpendicular to the rotation axis;

the transmission piece is provided with a connecting end, a matching groove is formed in the piston corresponding to the connecting end, the connecting end is matched in the matching groove, a gap is formed between the connecting end and the matching groove in a second direction, and the second direction is perpendicular to the first direction and the rotation axis.

7. The oral care device of claim 6, wherein the second shaft section is formed with a boss at an end thereof adjacent to the first shaft section, the second bearing fits over the first shaft section, and opposing two walls of the second bearing are abutted by an inner wall of the carrier and the boss.

8. The oral care device of claim 6, wherein,

a first bearing is arranged in the matching part, one of the eccentric part and the matching part is in running fit with the first bearing, and the other is fixed with the first bearing; or,

the eccentric part and the matching part are fixed; or,

the matching part is provided with an opening arranged along a second direction, and the second direction is perpendicular to the first direction and the rotation axis.

9. The oral care device of claim 6, wherein,

the eccentric part is connected with a columnar connecting piece, and one end of the columnar connecting piece, which is far away from the body, is provided with a flange extending outwards along the circumferential direction;

the cooperation portion internal fixation is provided with first bearing, the column connecting piece normal running fit is in the first bearing, and the body with the opposite side of flange is pressed respectively on the both sides terminal surface of first bearing.

10. The oral care device of claim 6, wherein,

the connecting part is a connecting groove, the driving shaft is matched in the connecting groove, and one side of the connecting groove is provided with a positioning hole extending along the radial direction of the rotation axis;

the piston drive assembly for an oral care device further includes an axial locating pin passing through the locating hole and abutting against an outer sidewall of the drive shaft.