CN114652472A

CN114652472A - Multi-piston drive assembly for oral care device and oral care device

Info

Publication number: CN114652472A
Application number: CN202210271554.XA
Authority: CN
Inventors: 陈智龙; 王忠维; 罗远达; 冉剑波
Original assignee: Shenzhen Ruike Fashion Electronic Co ltd
Current assignee: Shenzhen Ruike Fashion Electronic Co ltd
Priority date: 2022-03-18
Filing date: 2022-03-18
Publication date: 2022-06-24
Anticipated expiration: 2042-03-18

Abstract

The application provides a many pistons drive assembly and oral care device for oral care device carries out reciprocating motion through two at least pistons that a driving piece drive set up in the piston pump, can improve the drive efficiency of driving piece, the corresponding demand that reduces its rotational speed. And because the requirement of the rotating speed of the driving piece is reduced, the noise is correspondingly reduced, the abrasion and the vibration between parts are reduced, the service life of the whole structure is prolonged, and the use experience of a user is improved. Meanwhile, when the plurality of pistons are symmetrically arranged on the transmission piece, the stress of each part can be balanced when the pistons reciprocate, and the condition that the stress of a single piston is uneven when fluid is pumped in and out does not exist.

Description

Multi-piston drive assembly for oral care device and oral care device

Technical Field

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

Background

Piston pump assemblies are a core component of oral care devices such as dental irrigators, and in existing oral care devices, the piston pump assembly is generally a single piston cylinder formed by a single piston cylinder and a piston fitted within the piston cylinder, which reciprocates to effect the pumping in and out of a fluid. Wherein, when pumping in the fluid, the piston pump subassembly does not realize the pump-out of liquid, and the pulse frequency of oral care device is less, and the drive of driving piece such as the motor that is used for driving the piston pump subassembly is less efficient.

And the piston usually obtains the drive power by the gear drive structure, and the tooth of drive motor meshes with the driving tooth of gear drive structure in order to slow down the speed and increase the square, and the motor tooth that sets up eccentrically converts rotary motion into the linear motion of piston simultaneously to change the pressure in the piston cylinder and realize the drive to the fluid. In this process, gear noise is generated when the teeth of the motor are engaged with the transmission teeth. Meanwhile, in the processes of pumping fluid in and pumping fluid out, the stress of the gear is not uniform, so that when the gear is meshed, the stress of the transmission gear on one side is larger, and the stress of the transmission gear on the other side is smaller, so that the service life of the gear is greatly reduced.

Disclosure of Invention

The present application provides a multi-piston drive assembly for an oral care device and an oral care device to improve the drive efficiency of the multi-piston drive assembly therein.

A first aspect of the present application provides a multi-piston drive assembly for an oral care device comprising a drive member, a transmission member, and at least two pistons, wherein the transmission member is drivingly connected to the drive member and has at least two transmission portions; at least two pistons, set up and connect to the said drive part that sets up correspondingly corresponding to the said drive part; the driving part can drive the transmission part to move so that the transmission part drives the at least two pistons to reciprocate simultaneously.

In some embodiments, the driving member is an electric coil, and the transmission member includes at least two permanent magnets, each of which has the transmission part thereon; or the driving part comprises a driving shaft, the driving part comprises an inner ring, an outer ring, a supporting frame and balls, the supporting frame and the balls are arranged between the inner ring and the outer ring, the supporting frame is used for fixing the balls, the inner ring is connected to the driving shaft, an oval raceway which is connected end to end along the circumferential direction is formed on the inner ring, the balls are matched in the raceway, and at least two driving parts are positioned on the outer ring; or, the driving member comprises a driving shaft and an eccentric member, wherein the driving shaft has a rotation axis; the eccentric part is connected to the driving shaft and provided with an eccentric part which is arranged in a way of deviating from the rotating axis, and the transmission part is connected to the eccentric part; the driving shaft can drive the eccentric part to rotate along the rotating axis so as to enable the transmission part to move.

In some embodiments, when the driving member comprises the driving shaft and the eccentric member, the driving shaft and the eccentric member are in transmission connection through gear fit; alternatively, the drive shaft is fixedly connected to the eccentric.

In some embodiments, when the driving shaft is fixedly connected to the eccentric member, the eccentric member is a connecting rod, one end of the connecting rod is connected to the driving shaft, and the eccentric portion is located at the other end of the connecting rod, and the eccentric portion and the transmission member, the transmission portion and the piston are connected through hinges; or, the eccentric part has relative first terminal surface and second terminal surface, first terminal surface one side is equipped with connecting portion, connecting portion with the coaxial setting of axis of rotation, and be connected to the drive shaft, the eccentric part is located second terminal surface one side.

In some embodiments, when the drive shaft is fixedly connected to the eccentric, the eccentric comprises a body and a connecting portion disposed on the body, the connecting portion being disposed coaxially with the axis of rotation and connected to the drive shaft; and the middle part of 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 vertical to the rotating 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 matching part is provided with a matching space, and the eccentric part is matched in the matching space and can be contacted with the inner wall of the matching part when being driven so as to drive the matching part to move; or, the matching part is provided with an opening arranged along a second direction, and the second direction is vertical to the first direction and the rotating axis.

In some embodiments, a connecting piece is arranged at the eccentric part, the connecting piece is provided with a base shaft section and a balance shaft section which are connected, the base shaft section is connected with the eccentric part and matched with the matching part, and the balance shaft section is arranged coaxially with the rotation axis.

In some embodiments, the matching portion has a matching space, the base shaft segment is provided with a first bearing, the first bearing is located in the matching space, and when the eccentric member rotates, the first bearing can contact with the inner wall of the matching portion to drive the matching portion to move.

In some embodiments, a bearing or a fixing sleeve is also provided on the circumferential outer side of the balance shaft section.

In some embodiments, a fitting groove is provided on the piston corresponding to the transmission portion, the transmission portion is fitted in the fitting groove and forms a gap with the fitting 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 fitted in the connecting groove, and one side of the connecting groove is provided with a positioning hole extending in a radial direction of the rotation axis; the multi-piston drive assembly for an oral care device further comprises an axial locating pin that passes through the locating hole and abuts against an outer sidewall of the drive shaft.

Accordingly, a second aspect of the present application provides a multi-piston pump drive assembly comprising a drive member, a transmission member, at least two pistons and a piston cylinder. Wherein the driving member has a driving shaft having a rotation axis and an eccentric member connected to the driving shaft and having an eccentric portion disposed offset from the rotation axis; the transmission piece is connected to the eccentric part and is provided with at least two transmission parts; at least two pistons are arranged corresponding to the transmission parts and connected to the transmission parts arranged correspondingly; the piston cylinder is provided with an inner cavity extending along a first direction, the at least two pistons are arranged in the inner cavity, and the first direction and the rotating axis are arranged at an angle. The driving shaft can drive the eccentric part to rotate along the rotating axis, so that the transmission part drives the at least two pistons to reciprocate simultaneously.

Accordingly, a third aspect of the present application provides an oral care device comprising a drive member, a transmission member, at least two pistons, and a piston cylinder. Wherein, the transmission part is connected to the driving part in a transmission way and is provided with at least two transmission parts; at least two pistons are arranged corresponding to the transmission parts and connected to the transmission parts arranged correspondingly; the piston cylinder is provided with an inner cavity, the inner cavity is provided with a liquid inlet and a liquid outlet, and the at least two pistons are arranged in the inner cavity in a matched mode. The driving part can drive the transmission part to move so that the transmission part drives the at least two pistons to reciprocate simultaneously.

In some embodiments, when the driver comprises the drive shaft and the eccentric, the eccentric comprises a body and a connecting portion disposed on the body, the connecting portion being disposed coaxially with the axis of rotation and fixedly connected to the drive shaft; and the middle part of 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 vertical to the rotating 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 matching part is provided with a matching space, and the eccentric part is matched in the matching space and can be contacted with the inner wall of the matching part when being driven so as to drive the matching part to move; or the matching part is provided with an opening arranged along a second direction, and the second direction is vertical to the first direction and the rotation axis.

In some embodiments, the oral care device further comprises a carrier having a receiving cavity and an opening communicating with 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 rotating axis and is in rotating fit with the eccentric part.

In some embodiments, the eccentric comprises first and second connected shaft segments, the axes of the first and second shaft segments being substantially parallel, the first shaft segment being arranged coaxially with the drive shaft for connection thereto, the eccentric being located on the second shaft segment.

The application has the following beneficial effects: in the multi-piston driving assembly for the oral care device and the oral care device provided by the application, at least two pistons arranged in the piston pump are driven by one driving piece to reciprocate, so that the driving efficiency of the driving piece can be improved, and the requirement on the driving rotating speed of the driving piece is correspondingly reduced. And because the requirement of the driving part for driving the rotating speed is reduced, the noise is correspondingly reduced, the abrasion and the vibration between parts are reduced, the service life of the whole structure is prolonged, and the use experience of a user is improved. Simultaneously, when the symmetry set up a plurality of pistons on the driving medium, the atress of each part can be balanced each other during reciprocating motion, does not have single piston and the uneven condition of atress when pump income fluid and pump fluid.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

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

Fig. 2 illustrates an exploded view of a multi-piston drive assembly for an oral care device in an embodiment of the present application.

Fig. 3 illustrates a front view in half section of a multi-piston drive assembly for an oral care device in an embodiment of the present application.

The main components in this application are numbered as follows:

drive member 110 axial locating pin 140

Drive shaft 111 coupling 150

Eccentric 112 base shaft segment 151

Body 1121 balances shaft segment 152

Connecting portion 1122 flange 153

Locating hole 1123 fixing sleeve 154

Eccentric 1124 first bearing 160

The first shaft section 1125 piston cylinder 170

Second shaft segment 1126 second bearing 180

The first end surface 1127 carrier 310

Second end surface 1128 first bearing member 311

Boss 1129 second carrier 312

Liquid inlet pipeline 320 of transmission part 120

Liquid outlet pipeline 330 of transmission part 121

Fitting portion 122 one-way valve 340

Piston 130 mount 350

Fitting groove 131

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application. Furthermore, it should be understood that the detailed description and specific examples, while indicating exemplary embodiments of the invention, are given by way of illustration and explanation only, and are not intended to limit the scope of the invention. In the present application, unless otherwise specified, the use of directional terms such as "upper", "lower", "left" and "right" generally refer to upper, lower, left and right in the actual use or operation of the device, and specifically to the orientation of the drawing figures.

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

The present application provides a multi-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 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 respective embodiments have respective emphasis, and reference may be made to related descriptions of other embodiments for parts that are not described in detail in a certain embodiment.

Referring to fig. 1-3, embodiments of the present application provide a multi-piston drive assembly for an oral care device that includes a driving member 110, a transmission member 120, and at least two pistons 130.

Wherein the driving member 110 is used for providing a driving force for the movement of the transmission member 120 and the at least two pistons 130. Referring to fig. 2, a motor is shown as the driving member 110 in this embodiment, the driving member 110 has a driving shaft 111, and the driving shaft 111 has a rotation axis a.

The transmission member 120 is drivingly connected to the driving member 110 and has a transmission portion 121 for connecting the piston 130. Here, the transmission member 120 is used to convert the driving force applied by the driving member 110 into the reciprocating motion of the piston 130. For example, referring to fig. 2 and 3, in the present embodiment, the transmission member 120 has two transmission parts 121 symmetrically disposed at left and right sides, and correspondingly, the multi-piston driving assembly for an oral care device includes two pistons 130, and the two pistons 130 are respectively and fittingly connected to the two transmission parts 121. When the driving member 110 drives the transmission member 120 to move, the transmission member 120 drives the two pistons 130 to reciprocate simultaneously. It is understood that, in other embodiments, the number of the transmission parts 121 is not limited to two, for example, it may be three, four, etc., and the present embodiment does not limit it. And, correspondingly, the number of the pistons 130 is also arranged corresponding to the transmission part 121 and connected to the transmission part 121 arranged correspondingly. Here, symmetrically arranging the transmission part 121 and the piston 130 will have a more stable transmission effect.

Here, at least two pistons 130 can be driven to reciprocate by one driving member 110, which helps to reduce the power requirement of the driving member 110 and reduce noise. For example, in the embodiment shown in fig. 1 and 2, when two pistons 130 are provided, the required piston pump power requirement can be achieved with a half reduction in the rotational speed of the driver 110 by driving two pistons 130 provided in the piston pump to reciprocate by one driver 110, which improves the driving efficiency of the driver 110. Moreover, due to the reduction of the driving speed of the driving member 110, the noise is correspondingly reduced, the abrasion and vibration between parts are reduced, the service life of the whole structure is prolonged, and the use experience of a user is improved. Meanwhile, the two pistons 130 are symmetrically arranged on the transmission member 120, so that the stress of each part can be balanced when the piston reciprocates, and the condition that the stress of a single piston 130 is uneven when fluid is pumped in and out does not exist.

In some embodiments, referring to fig. 3, the driving member 110 further includes an eccentric member 112, the eccentric member 112 is fixedly connected to the driving shaft 111 and has an eccentric portion 1124 disposed offset from the rotation axis, i.e., the central axis of the eccentric portion 1124 is not coaxial with the rotation axis. Here, the eccentric member 112 is fixedly connected to the driving shaft 111, so that when the driving shaft 111 rotates, the eccentric member 112 can be simultaneously rotated about the rotation axis.

Here, the driving shaft 111 and the eccentric member 112 are fixedly connected, but not engaged with each other, so as to reduce friction, increase transmission efficiency, prolong the service life of the whole structure, and reduce transmission noise due to no gear engagement. In addition, the gear transmission structure can not be abraded greatly due to different acting forces during reciprocating motion, the stress of the piston 130 is more uniform, the abrasion of the piston 130 is reduced, and the service life of the multi-piston driving assembly for the oral care device is longer. Meanwhile, the eccentric part 112 and the driving shaft 111 are conveniently assembled and are not prone to position deviation, so that the assembling precision of the whole structure is improved, and the assembling process is simplified.

Further, the transmission member 120 is connected to the eccentric portion 1124, so that the transmission member 120 can reciprocate under the driving of the eccentric portion 1124. Referring to fig. 2 and 3, in the present embodiment, two pistons 130 are provided, the middle portion of the transmission member 120 is connected to the eccentric portion 1124, and both ends of the transmission member 120 are connected to the corresponding pistons 130 as transmission portions 121. When the eccentric member 112 rotates along the rotation axis, the eccentric portion 1124 also rotates along the rotation axis. Since the eccentric portion 1124 is disposed offset from the rotation axis, the transmission member 120 connected to the eccentric portion 1124 will generate a reciprocating displacement along with the rotation of the eccentric portion 1124, and thus the piston 130 will be driven to reciprocate. In addition, here, the pistons 130 are symmetrically arranged in the left-right direction, and the eccentric portion 1124 is connected to the middle portion of the transmission member 120, which helps to ensure the transmission stability of the transmission member 120. It is understood that in other embodiments, the transmission member 120 can be coupled to the eccentric portion 1124 and/or the piston 130 via other locations, and is not limited to being coupled via its ends and middle portion.

It can be known that the multi-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 120 through the eccentric member 112, and enables the transmission member 120 to drive the piston 130 to reciprocate, thereby improving the transmission efficiency between the driving shaft 111 and the piston 130. However, it is understood that in other embodiments, the driving shaft and the eccentric member may also be in transmission connection through gear engagement, for example, the driving shaft drives a disc gear to move, the disc gear is engaged with the eccentric member or an eccentric position on the disc gear is engaged with the transmission member, etc., and a person skilled in the art may adjust the specific structure of gear engagement according to actual needs, and this embodiment is not limited in particular.

In some implementations, referring to fig. 3, the eccentric member 112 includes a body 1121 and a connecting portion 1122 disposed on the body 1121, and the connecting portion 1122 is disposed coaxially with the rotation axis and is connected to the driving shaft 111. In this embodiment, the connecting portion 1122 is a connecting slot, the connecting slot is disposed in a profile of the driving shaft 111, and the driving shaft 111 is fitted in the connecting slot. For example, when the drive shaft 111 is D-shaped in cross-section, the connecting slots are correspondingly D-shaped slots. And, one side of the coupling groove is provided with a positioning hole 1123 extending in a radial direction of the rotation axis. The multi-piston drive assembly for an oral care device further comprises an axial locating pin 140, the axial locating pin 140 extending radially through the locating hole 1123 and bearing against the outer sidewall of the drive shaft 111. Here, the connecting portion 1122 circumferentially fixes the driving shaft 111, and the axial positioning pin 140 applies a radial force to the driving shaft 111 to axially fix the driving shaft, so that the driving shaft 111 and the eccentric member 112 are fixedly connected, and the position accuracy and the connection reliability between the eccentric member 112 and the driving shaft 111 are ensured.

In some implementations, the transmission member 120 has a matching portion 122, the matching portion 122 is used for connecting with the eccentric member 112, and may be a groove or an opening, in this embodiment, the matching portion 122 is a slot located in the middle of the transmission member 120, and a matching space is formed in the slot. Here, the eccentric portion 1124 extends outward from the body 1121 and is engaged with the engaging portion 122, so that the driving member 120 can drive the piston 130 to move along a first direction, please refer to fig. 3, where a front-back direction of a straight line where a dot-dash line B is located is the first direction, and the first direction is disposed at an angle with the rotation axis (i.e., the dot-dash line a), that is, the first direction is not parallel to the rotation axis. Here, in this embodiment, the movement direction of the transmission member 120 driving the piston 130 is substantially perpendicular to the direction of the rotation axis of the driving shaft 111, so that the size of the multi-piston driving assembly in the first direction is reduced, the size and space requirement in the first direction is saved, and the adjustment of the setting position according to the requirement of the actual space is facilitated, so as to save space, optimize the layout and achieve a compact structural setting.

In a first example, and with continued reference to FIG. 3, the eccentric portion 1124 is a connecting slot. A connecting piece 150 is connected to the eccentric portion 1124, the connecting piece 150 has a base shaft segment 151, a first bearing 160 is fitted to the circumferential outer side of the base shaft segment 151, the first bearing 160 is located in the fitting space, a flange 153 extending to the circumferential outer side is provided at one end of the base shaft segment 151 away from the body 1121, and two opposite end faces of the first bearing 160 are pressed between the flange 153 and the wall surface of the eccentric member 112 facing the flange 153. Here, the engagement of the eccentric 112 with the transmission element 120 is achieved by means of the connecting element 150 and the first bearing 160. When the eccentric portion 1124 rotates, the first bearing 160 can be driven to move by the connecting member 150, and then the first bearing 160 can contact with the inner wall of the matching portion 122 to drive the transmission member 120 to move when moving, so as to drive the piston 130 to reciprocate. Due to the arrangement of the first bearing 160, the friction generated when the connecting member 150 moves is small, which helps to reduce noise and wear. It is understood that in other embodiments, the first bearing 160 may not be provided, i.e., at least a portion of the base shaft segment 151 is located in the fitting space and can drive the fitting portion 122 to move.

In the second example, the difference from the previous example is that the first bearing is fixedly arranged in the fitting portion, for example, the first bearing is fixed in the fitting portion by means of encapsulation, the fitting portion is a slot, and in other embodiments, it may be a through hole, etc., and only a fitting space for accommodating the first bearing needs to be formed. The connecting piece is rotationally fitted in the first bearing. Here, a matching connection of the eccentric element to the transmission element is achieved by the connecting element and the position of the transmission element can be defined in order to stabilize its position and to apply a uniform force. When the eccentric part rotates, the transmission part can be driven to move through the connecting piece, and then the piston is driven to reciprocate. Meanwhile, due to the arrangement of the first bearing, when the connecting piece drives the transmission piece to move, the friction between the connecting piece and the transmission piece is small. Also, it is understood that in other embodiments, one of the eccentric portion and the engaging portion may be rotationally engaged with the first bearing and the other may be fixed with the first bearing, that is, the first bearing may be fixedly connected with the eccentric portion and rotationally engaged with the engaging portion. Alternatively, in other embodiments, the eccentric portion may also be fixedly connected to the transmission member, for example, the eccentric portion is fixedly connected via the connecting member or directly connected to the transmission member.

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

Here, as mentioned above, the connecting member 150 further has the balance shaft section 152, the balance shaft section 152 is connected to the base shaft section 151, the balance shaft section 152 is disposed coaxially with the rotation axis, and when the eccentric member 112 and the connecting member 150 rotate with the rotation axis as a shaft, the balance shaft section 152 can improve the stable state of the rotation thereof. Referring to fig. 2 and fig. 3, in the present embodiment, a fixing sleeve 154 is further disposed on an axially outer side of the balance shaft section 152, and the fixing sleeve 154 is fixed to an outer bearing member 310 (the details of the bearing member 310 will be described later). In other embodiments, the fixing sleeve 154 may be replaced by a bearing to further ensure the transmission precision, but the cost requirement is high, and the manufacturing process requirement is high in a scene with a small structural size. Meanwhile, in other embodiments, if the requirement for precision is low, or in order to reduce the cost, the fixing sleeve 154 or the bearing may not be sleeved on the balance shaft section 152.

Since the transmission member 120 will generate periodic swing when being driven, in some embodiments, referring to fig. 3 again, in order to further convert the periodic swing to the movement of the piston 130 only along the first direction, a spherical connection end is disposed at both ends of the transmission member 120 to serve as the transmission part 121, a fitting groove 131 is disposed on the piston 130 corresponding to the transmission part 121, a gap is formed between the transmission part 121 and the fitting groove 131 when the transmission part 121 fits into the fitting groove 131 in the second direction, the second direction is perpendicular to both the first direction and the rotation axis, specifically, in this embodiment, the fitting groove 131 has a straight section and a spherical fitting section, and the inner diameter of the spherical fitting section is larger than the outer diameter of the transmission part 121. It will be appreciated that the size of the gap is specifically set according to the movement stroke in the second direction when the transmission member 120 rotates. Here, in the present embodiment, the extending direction of the piston cylinder 170 (the front-back direction of the dashed line B in fig. 2), i.e., the moving direction of the piston 130 is taken as the first direction. When the transmission member 120 swings back and forth, it generates relative displacement in the second direction with respect to the piston 130, and drives the piston 130 to reciprocate along the first direction through the cooperation of the transmission portion 121 and the engagement groove 131. It will be appreciated that in other embodiments, the drive portion 121 and the mating slot 131 are not limited to spherical, and may have other shapes, but the arcuate interface helps to make the drive mating friction between the two less and more compliant. In addition, the present embodiment is described by taking the example of providing two pistons 130, and in other embodiments, the number and the position of the transmission parts 121 can be adjusted accordingly.

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

In some embodiments, referring again to fig. 2 and 3, the eccentric 112 includes a first shaft segment 1125 and a second shaft segment 1126 coupled together, the axes of the first and

second shaft segments

1125, 1126 being substantially parallel. The first shaft section 1125 has a first end surface 1127 formed thereon, and the first shaft section 1125 is coaxially disposed with the driving shaft 111 for connecting the driving shaft 111. The second shaft section 1126 has a second end surface 1128 formed thereon, and the eccentric portion 1124 is located on the second shaft section 1126. Here, the first end surface 1127 and the second end surface 1128 are opposite end surfaces, and thus the connecting portion 1122 is located on the first end surface 1127 side and the eccentric portion 1124 is located on the second end surface 1128 side. That is, the connecting portion 1122 and the eccentric portion 1124 are respectively disposed at two opposite sides of the eccentric member 112, so that the connection between the connecting portion and the driving shaft 111 and the transmission member 120 is facilitated, and the driving shaft 111 and the transmission member 120 are not easily interfered with each other when connected to the eccentric member 112. It will be appreciated that in other embodiments, the connecting portion and the eccentric portion 1124 may also be located on the same side of the end surface of the eccentric member 112.

In addition, in the present embodiment, the first shaft section 1125 and the second shaft section 1126 are integrally formed, which helps to reduce the number of assembling processes of the components. It is understood that the first shaft segment 1125 and the second shaft segment 1126 may be manufactured separately and then assembled together, and that the separate manufacturing facilitates the manufacture of small parts, the miniaturization of the eccentric 112, and the reduction of the size of the eccentric 112 to suit the application scenario with the miniaturization requirement.

Here, a boss 1129 is further formed at one end of the second shaft section 1126 near the first shaft section 1125, and when a second bearing 180 is fitted at the outer wall of the first shaft section 1125, the boss 1129 may be used to abut an end surface of the second bearing 180 so as to position and fit the second bearing 180. The second bearing 180 may provide less friction and more rotational compliance for the rotation of the first shaft segment 1125.

It is understood that in other embodiments, the structure of the driving member 110 is not limited to the structure of the driving shaft 111 and the eccentric member 112, and the driving member 110 only needs to drive the transmission member 120 to move periodically. Exemplarily, the driving member is an electrified coil, the transmission member includes at least two permanent magnets, each permanent magnet is provided with the transmission portion, and when different currents are applied to the electrified coil, different magnetic forces are generated to drive the permanent magnets to drive the transmission member to reciprocate. Still exemplarily, the driving piece includes the drive shaft, the driving medium includes inner circle, outer lane and sets up support frame and ball between inner circle and outer lane, the support frame is used for fixing the ball, the inner circle is connected to the drive shaft and forms the raceway that is oval and end to end along circumference on it, the ball cooperation is in the raceway, at least two the transmission portion is located on the outer lane. When the driving shaft rotates, the inner ring is driven to rotate, and due to the arrangement of the oval raceway, the outer ring generates axial back-and-forth reciprocating displacement, and is connected to the piston through the transmission part and drives the piston to reciprocate.

Accordingly, the present embodiment also provides a piston pump drive assembly comprising a driver 110, a transmission 120, at least two pistons 130 and a piston cylinder 170. The driving member 110 has a driving shaft 111 and an eccentric member 112, the driving shaft 111 has a rotation axis, the eccentric member 112 is connected to the driving shaft 111 and has an eccentric portion 1124 disposed offset from the rotation axis; the transmission member 120 is connected to the eccentric portion 1124 and has at least two transmission portions 121; at least two pistons 130 are disposed corresponding to the transmission part 121 and connected to the transmission part 121 disposed correspondingly; the piston cylinder 170 has an inner cavity extending in a first direction in which the at least two pistons 130 are disposed, the first direction being disposed at an angle to the axis of rotation. Here, the driving shaft 111 can drive the eccentric member 112 to rotate along the rotation axis, so that the transmission member 120 drives the at least two pistons 130 to reciprocate simultaneously.

In some embodiments, the first direction is substantially perpendicular to the axis of rotation, facilitating ease of assembly and improving transmission accuracy. Here, the angle between the first direction and the axis of rotation ranges, for example, between 80 ° and 100 °. For example, the included angle between the two is 80 °, 85 °, 90 °, 100 °, etc. It should be understood that this example does not exemplify all the value examples, and in other embodiments, the value of the included angle may be other values within the above range.

It will be appreciated that the multi-piston drive assembly for an oral care device may be used in an oral care device, such as a dental prophylaxis device, to provide fluid pumping in and out of the oral care device. Thus, to better achieve the technical effects of the embodiments of the present application, in an embodiment of the present application, there is also provided an oral care device comprising a drive member 110, a transmission member 120, at least two pistons 130, and a piston cylinder 170. The transmission member 120 is connected to the driving member 110 in a transmission manner and has at least two transmission portions 121; the at least two pistons 130 are disposed corresponding to the transmission part 121 and connected to the transmission part 121 disposed correspondingly; the piston cylinder 170 has an inner cavity with a liquid inlet and a liquid outlet, and the at least two pistons 130 are cooperatively disposed in the inner cavity. The driving member 110 can drive the transmission member 120 to move, so that the transmission member 120 drives the at least two pistons 130 to reciprocate simultaneously.

As shown in fig. 2, the liquid inlet may be connected to a liquid storage component such as a liquid storage barrel through a liquid inlet pipe 320, and the liquid outlet may be connected to a liquid outlet component such as a nozzle through a liquid outlet pipe 330, so as to clean the cavity. Liquid inlet 320 and liquid outlet 330 may also be provided with valves and the like. Illustratively, a check valve 340 is disposed in the liquid outlet pipe 330.

In some embodiments, the driving member is an electric coil, and the transmission member includes at least two permanent magnets, each of which has the transmission part thereon; or the driving part comprises a driving shaft, the driving part comprises an inner ring, an outer ring, a supporting frame and balls, the supporting frame and the balls are arranged between the inner ring and the outer ring, the supporting frame is used for fixing the balls, the inner ring is connected to the driving shaft, an oval raceway which is connected end to end along the circumferential direction is formed on the inner ring, the balls are matched in the raceway, and at least two driving parts are positioned on the outer ring; alternatively, the driving member 110 comprises a driving shaft 111 and an eccentric member 112, wherein the driving shaft 111 has a rotation axis; the eccentric member 112 is connected to the driving shaft 111 and has an eccentric portion 1124 disposed offset from the rotational axis, and the transmission member 120 is connected to the eccentric portion 1124; wherein the driving shaft 111 can drive the eccentric member 112 to rotate along the rotation axis, so as to move the transmission member 120.

In some embodiments, the driving member 110 includes the driving shaft 111 and the eccentric member 112, the eccentric member 112 includes a body 1121 and a connecting portion 1122 disposed on the body 1121, the connecting portion 1122 being disposed coaxially with the rotation axis and fixedly connected to the driving shaft 111; in addition, the middle of the transmission member 120 is provided with an engaging portion 122, and the eccentric portion 1124 extends outward from the body 1121 and engages with the engaging portion 122, so that the transmission member 120 can drive the piston 130 to move along a first direction, where the first direction is perpendicular to the rotation axis.

In some embodiments, a first bearing is disposed within the mating portion 122, one of the eccentric portion and the mating portion 122 is rotationally mated with the first bearing, and the other is fixed with the first bearing; or, the matching part 122 has a matching space, and the eccentric part 1124 is matched in the matching space and can be contacted with the inner wall of the matching part 122 when being driven so as to drive the matching part 122 to move; alternatively, the matching portion 122 has an opening disposed along a second direction, and the second direction is perpendicular to both the first direction and the rotation axis.

In some embodiments, a connecting member 150 is disposed at the eccentric portion 1124, the connecting member 150 has a base shaft segment 151 and a balance shaft segment 152 connected, the base shaft segment 151 is connected with the eccentric portion 1124 and is matched with the matching portion 122, and the balance shaft segment 152 is disposed coaxially with the rotation axis.

In some embodiments, the oral care device further comprises a carrier 310 and a second bearing 180, the carrier 310 having a receiving cavity and an opening communicating to the receiving cavity, the eccentric 112, the driver 120, the piston 130 and the piston cylinder 170 being disposed within the receiving cavity, the drive shaft 111 being connected to the eccentric 112 by the opening; the second bearing 180 is disposed in the receiving cavity, is disposed coaxially with the rotational axis, and is in rotational engagement with the eccentric member 112.

Here, referring to fig. 1 and fig. 2, in the present embodiment, the bearing component 310 includes a first bearing component 311 and a second bearing component 312, which are disposed opposite to each other, and the first bearing component 311 and the second bearing component 312 can cover each other to form the accommodating cavity. Here, the carrier 310 of a split design is convenient to manufacture and easy to assemble the components therein. A fluid interface portion is disposed on the carrier 310 corresponding to the liquid inlet, the liquid outlet, the liquid inlet pipe 320 and the liquid outlet pipe 330 of the inner cavity, and the fluid interface portion may be used to connect the fluid pipes, and the fluid interface portion may be, for example, a through hole for the liquid inlet pipe 320 and the liquid outlet pipe 330 to pass through, or may be, for example, an interface end connected to the liquid inlet pipe 320 and the liquid outlet pipe 330.

In some embodiments, as shown in fig. 1 to fig. 3, two piston cylinders 170 are provided corresponding to the number of the pistons 130, and the inner cavities of the two piston cylinders 170 are respectively matched with the pistons 130 correspondingly provided. The inner cavities of the piston cylinders 170 may be connected to each other, for example, the liquid outlets of the inner cavities of the piston cylinders 170 are connected to each other and connected to a nozzle, or the inner cavities of the piston cylinders 170 may not be connected to each other, that is, the liquid outlets are connected to respective nozzles, and the like.

In some embodiments, the eccentric 112 includes first and second

connected shaft segments

1125, 1126, the axes of the first and

second shaft segments

1125, 1126 being substantially parallel, illustratively at an included angle of 20 ° or less. The first shaft section 1125 is coaxially disposed with the drive shaft 111 for connection thereto, and the eccentric 1124 is located on the second shaft section 1126.

In some embodiments, referring to fig. 1 and 2, the oral care device further comprises a fixing member 350, wherein the fixing member 350 is connected to the carrier 310, in this example, specifically to the first carrier 311. The fixing member 350 is disposed corresponding to the opening of the first carrier 311, and a through hole is disposed on the fixing member 350 corresponding to the opening. After the motor is mounted to the fixing member 350, the driving shaft 111 of the motor may pass through the through hole of the fixing member 350 and be coupled with the eccentric member 112 through the opening. Here, the fixing member 350 is provided to facilitate the fixing of the motor, so as to facilitate the installation and replacement of the motor.

Application example 1

In an exemplary application, a multi-piston drive assembly for an oral care device is provided, comprising a drive member 110, a transmission member 120 and two pistons 130, the pistons 130 being part of a liquid pump. The driving member 110 can drive the transmission member 120 to move, so that the transmission member 120 drives the at least two pistons 130 to reciprocate simultaneously.

Application example two

In the second application example, on the basis of the first application example, the driving member 110 and the transmission member 120 are in transmission engagement through an eccentric gear structure, where the eccentric gear structure may include a plurality of gears engaged with each other to achieve a speed change effect.

Application example three

In application example three, on the basis of the application example one, the driving shaft 111 of the driving member 110 is directly connected to the eccentric member 112, the eccentric member 112 is provided with an eccentric portion 1124 offset from the rotation axis of the driving shaft 111, the transmission member 120 is connected to the eccentric portion 1124, and the piston 130 is connected to the transmission member 120. When the driving shaft 111 rotates, the eccentric member 112 and the transmission member 120 can be driven to rotate, and the piston 130 is driven to reciprocate. Compared with a gear transmission mode, the gear transmission mode is beneficial to reducing noise, reducing friction between teeth and prolonging service life.

Application example four

In a fourth example of application, there is provided a multi-piston drive assembly for an oral care device comprising a drive member 110, a transmission member 120, two pistons 130 and a piston cylinder 170, the pistons 130 and the piston cylinder 170 forming two liquid pumps. Here, both of the piston cylinders 170 have an inner cavity arranged in a first direction, and the correspondingly arranged piston 130 is fittingly arranged in the piston cylinder 170. The axis of rotation of the driver 110 is perpendicular to the first direction. The arrangement makes the overall layout of the integral multi-piston driving assembly more compact, can reduce the occupied space in the first direction, and is favorable for adapting to the use requirements of different space scenes.

Application example five

In application example five, there is provided an oral care device that is a dental prophylaxis device. In other examples, the oral care device may also be a toothbrush, a faucet 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 multi-piston drive assembly for an oral care device provided in any one of application examples one to four.

It is to be understood that, in the foregoing embodiments, unless otherwise specified, terms used in different embodiments have the same meaning, different emphasis is placed on different embodiments, details which are not described in detail in some embodiments may be given by reference to descriptions in other embodiments, and examples shown in the foregoing embodiments and technical effects may be correspondingly implemented.

The present application has been described in detail with respect to a multi-piston drive assembly and an oral care device for use in an oral care device, and the principles and embodiments of the present application have been described herein using specific examples, which are presented solely to aid in the understanding of the methods and their core concepts of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, the specific implementation manner and the application scope may be changed, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims

1. A multi-piston drive assembly for an oral care device comprising, a drive member;

the transmission piece is connected to the driving piece in a transmission manner and is provided with at least two transmission parts; and

at least two pistons, set up and connect to the said drive part that sets up correspondingly corresponding to the said drive part;

the driving part can drive the transmission part to move, so that the transmission part drives the at least two pistons to simultaneously reciprocate.

2. The multi-piston drive assembly for an oral care device of claim 1,

the driving part is an electrified coil, the driving part comprises at least two permanent magnets, and each permanent magnet is provided with the driving part; or,

the driving piece comprises a driving shaft, the driving piece comprises an inner ring, an outer ring, a supporting frame and balls, the supporting frame and the balls are arranged between the inner ring and the outer ring, the supporting frame is used for fixing the balls, the inner ring is connected to the driving shaft, a rolling way which is oval in shape and is connected end to end along the circumferential direction is formed on the inner ring, the balls are matched in the rolling way, and at least two driving parts are positioned on the outer ring; or,

the drive member comprises a drive shaft and an eccentric, wherein,

the driving shaft is provided with a rotating axis;

the eccentric part is connected to the driving shaft and provided with an eccentric part which is arranged in a way of deviating from the rotating axis, and the transmission part is connected to the eccentric part;

the driving shaft can drive the eccentric part to rotate along the rotating axis so as to enable the transmission part to move.

3. The multi-piston drive assembly for an oral care device of claim 2, wherein when the drive member comprises the drive shaft and the eccentric,

the driving shaft and the eccentric part are in transmission connection through gear matching; or,

the drive shaft is fixedly connected to the eccentric.

4. The multi-piston drive assembly for an oral care device of claim 3, wherein when the drive shaft is fixedly connected to the eccentric,

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 hinged with the transmission part and the piston; or,

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

5. The multi-piston drive assembly for an oral care device of claim 3, wherein when the drive shaft is fixedly connected to the eccentric,

the eccentric part comprises a body and a connecting part arranged on the body, and the connecting part is coaxially arranged with the rotation axis and is connected to the driving shaft; and the number of the first and second electrodes,

the middle part of 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 rotating axis.

6. The multi-piston drive assembly for an oral care device of claim 5,

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

the matching part is provided with a matching space, and the eccentric part is matched in the matching space and can be contacted with the inner wall of the matching part when being driven so as to drive the matching part to move; 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 rotating axis.

7. The multi-piston drive assembly for an oral care device of claim 5 wherein a connecting member is disposed at the eccentric portion, the connecting member having a base shaft segment and a counter shaft segment connected thereto, the base shaft segment being connected to the eccentric portion and cooperating with the cooperating portion, the counter shaft segment being disposed coaxially with the axis of rotation.

8. The multi-piston drive assembly according to claim 7, wherein the engagement portion has an engagement space, and wherein the base shaft segment has a first bearing disposed thereon, the first bearing being positioned in the engagement space, the first bearing being capable of contacting an inner wall of the engagement portion to move the engagement portion when the eccentric member rotates.

9. The multi-piston drive assembly for an oral care device of claim 7, wherein a bearing or a retaining sleeve is further provided circumferentially outboard of the balance shaft segment.

10. The multi-piston drive assembly for an oral care device according to claim 5, wherein a fitting groove is provided on the piston corresponding to the transmission portion, the transmission portion is fitted in the fitting groove and forms a gap with the fitting groove in a second direction, the second direction being perpendicular to both the first direction and the rotation axis.

11. The multi-piston drive assembly for an oral care device of claim 5,

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 rotating axis;

the multi-piston drive assembly for an oral care device further comprises an axial locating pin that passes through the locating hole and abuts against an outer sidewall of the drive shaft.

12. A multi-piston drive assembly for an oral care device, comprising,

a driving member having a driving shaft with a rotation axis and an eccentric member connected to the driving shaft and having an eccentric portion disposed offset from the rotation axis;

a transmission member connected to the eccentric portion and having at least two transmission portions;

at least two pistons, set up and connect to the said drive part that sets up correspondingly corresponding to the said drive part; and

a piston cylinder having an inner cavity extending in a first direction, the at least two pistons disposed in the inner cavity, the first direction disposed at an angle to the axis of rotation;

the driving shaft can drive the eccentric part to rotate along the rotating axis, so that the transmission part drives the at least two pistons to reciprocate simultaneously.

13. An oral care device, comprising,

a drive member;

the transmission piece is connected to the driving piece in a transmission manner and is provided with at least two transmission parts;

at least two pistons, set up and connect to the said drive part that sets up correspondingly in correspondence to the said drive part; and

the piston cylinder is provided with an inner cavity, the inner cavity is provided with a liquid inlet and a liquid outlet, and the at least two pistons are arranged in the inner cavity in a matched mode;

14. The oral care device of claim 13,

the driving part comprises a driving shaft, the driving part comprises an inner ring, an outer ring, a supporting frame and balls, the supporting frame and the balls are arranged between the inner ring and the outer ring, the supporting frame is used for fixing the balls, the inner ring is connected to the driving shaft, an oval raceway which is connected end to end along the circumferential direction is formed on the inner ring, the balls are matched in the raceway, and at least two driving parts are positioned on the outer ring; or,

the drive member comprises a drive shaft and an eccentric, wherein,

the driving shaft is provided with a rotating axis;

15. The oral care device of claim 14, wherein, when the drive member comprises the drive shaft and the eccentric,

the eccentric part comprises a body and a connecting part arranged on the body, and the connecting part is coaxially arranged with the rotating axis and is fixedly connected to the driving shaft; and the number of the first and second electrodes,

16. The oral care device of claim 15,

17. The oral care device of claim 15, wherein a connector is provided at the eccentric portion, the connector having a base shaft section and a counter shaft section connected, the base shaft section being connected to the eccentric portion and cooperating with the cooperating portion, the counter shaft section being coaxially disposed with the rotational axis.

18. The oral care device of claim 15, further comprising,

the bearing piece is provided with a containing cavity and an opening communicated to 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

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.

19. The oral care device of claim 18, wherein the eccentric comprises connected first and second shaft segments, the axes of the first and second shaft segments being substantially parallel, the first shaft segment being coaxially disposed with the drive shaft for connection thereto, the eccentric being located on the second shaft segment.